Re: [PATCH v2 4/4] powerpc/mm/radix: Create separate mappings for hot-plugged memory

[Aneesh Kumar K.V]

On 7/8/20 10:14 AM, Michael Ellerman wrote:

"Aneesh Kumar K.V"  writes:

To enable memory unplug without splitting kernel page table
mapping, we force the max mapping size to the LMB size. LMB
size is the unit in which hypervisor will do memory add/remove
operation.

This implies on pseries system, we now end up mapping


Please expand on why it "implies" that for pseries.


memory with 2M page size instead of 1G. To improve
that we want hypervisor to hint the kernel about the hotplug
memory range.  This was added that as part of

  That


commit b6eca183e23e ("powerpc/kernel: Enables memory
hot-remove after reboot on pseries guests")

But we still don't do that on PowerVM. Once we get PowerVM


I think you mean PowerVM doesn't provide that hint yet?

Realistically it won't until P10. So this means we'll always use 2MB on
Power9 PowerVM doesn't it?

What about KVM?

Have you done any benchmarking on the impact of switching the linear
mapping to 2MB pages?



The TLB impact should be minimal because with a 256M LMB size partition 
scoped entries are still 2M and hence we end up with TLBs of 2M size.




updated, we can then force the 2M mapping only to hot-pluggable
memory region using memblock_is_hotpluggable(). Till then
let's depend on LMB size for finding the mapping page size
for linear range.



updated


powerpc/mm/radix: Create separate mappings for hot-plugged memory

To enable memory unplug without splitting kernel page table
mapping, we force the max mapping size to the LMB size. LMB
size is the unit in which hypervisor will do memory add/remove
operation.

Pseries systems supports max LMB size of 256MB. Hence on pseries,
we now end up mapping memory with 2M page size instead of 1G. To improve
that we want hypervisor to hint the kernel about the hotplug
memory range.  That was added that as part of

commit b6eca18 ("powerpc/kernel: Enables memory
hot-remove after reboot on pseries guests")

But PowerVM doesn't provide that hint yet. Once we get PowerVM
updated, we can then force the 2M mapping only to hot-pluggable
memory region using memblock_is_hotpluggable(). Till then
let's depend on LMB size for finding the mapping page size
for linear range.

With this change KVM guest will also be doing linear mapping with
2M page size.




Signed-off-by: Bharata B Rao 
Signed-off-by: Aneesh Kumar K.V 
---
  arch/powerpc/mm/book3s64/radix_pgtable.c | 83 
  arch/powerpc/platforms/powernv/setup.c   | 10 ++-
  2 files changed, 81 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c 
b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 78ad11812e0d..a4179e4da49d 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -15,6 +15,7 @@
  #include 
  #include 
  #include 
+#include 
  
  #include 

  #include 
@@ -34,6 +35,7 @@
  
  unsigned int mmu_pid_bits;

  unsigned int mmu_base_pid;
+unsigned int radix_mem_block_size;


static? __ro_after_init?



Added __ro_after_iit


@@ -266,6 +268,7 @@ static unsigned long next_boundary(unsigned long addr, 
unsigned long end)
  
  static int __meminit create_physical_mapping(unsigned long start,

 unsigned long end,
+unsigned long max_mapping_size,
 int nid, pgprot_t _prot)
  {
unsigned long vaddr, addr, mapping_size = 0;
@@ -279,6 +282,8 @@ static int __meminit create_physical_mapping(unsigned long 
start,
int rc;
  
  		gap = next_boundary(addr, end) - addr;

+   if (gap > max_mapping_size)
+   gap = max_mapping_size;
previous_size = mapping_size;
prev_exec = exec;
  
@@ -329,8 +334,9 @@ static void __init radix_init_pgtable(void)
  
  	/* We don't support slb for radix */

mmu_slb_size = 0;
+
/*
-* Create the linear mapping, using standard page size for now
+* Create the linear mapping
 */
for_each_memblock(memory, reg) {
/*
@@ -346,6 +352,7 @@ static void __init radix_init_pgtable(void)
  
  		WARN_ON(create_physical_mapping(reg->base,

reg->base + reg->size,
+   radix_mem_block_size,
-1, PAGE_KERNEL));
}
  
@@ -486,6 +493,49 @@ static int __init radix_dt_scan_page_sizes(unsigned long node,

return 1;
  }
  
+static int __init probe_memory_block_size(unsigned long node, const char *uname, int

+ depth, void *data)
+{
+   const __be32 *block_size;
+   int len;
+
+   if (depth != 1)
+   return 0;
+
+   if (!strcmp(uname, "ibm,dynamic-reconfiguration-memory")) {


if (strcmp(uname, "ibm,dynamic-reconfiguration-memory") != 0)
return 

Re: FSL P5020/P5040: DPAA Ethernet issue with the latest Git kernel

[Christian Zigotzky]

On 08 July 2020 at 08:03 am, Madalin Bucur (OSS) wrote:

From: Christian Zigotzky 
Sent: Tuesday, July 7, 2020 9:26 PM
To: Madalin Bucur (OSS) 
Cc: mad skateman ; Camelia Alexandra Groza 
;
linuxppc-...@ozlabs.org; net...@vger.kernel.org; R.T.Dickinson 
;
Darren Stevens 
Subject: Re: FSL P5020/P5040: DPAA Ethernet issue with the latest Git kernel


On 7. Jul 2020, at 17:53, Madalin Bucur (OSS) 
 wrote:
Was DPAA functional before commit A?
How about after commit A and before commit B?
The DPAA Ethernet works from  the kernel 5.6-rc4 [1] till the Git kernel from 
the
11 of June [2]. It doesn’t work since the commit “fix bitmap_parse” [3].
[1] https://forum.hyperion-entertainment.com/viewtopic.php?p=49936#p49936
[2] https://forum.hyperion-entertainment.com/viewtopic.php?p=50848#p50848
[3] https://forum.hyperion-entertainment.com/viewtopic.php?p=50980#p50980

Hi,

can you please try to disable the network manager (see [1]), then boot with
the latest kernel, that does not work, and setup the interfaces manually?

Madalin

[1] 
https://help.ubuntu.com/community/NetworkManager#Stopping_and_Disabling_NetworkManager


@Skateman
I will compile the latest Git kernel after the 17th. Could you please 
test it without the NetworkManager?


Thanks

Re: [PATCH 00/20] Documentation: eliminate duplicated words

[Martin K. Petersen]

On Tue, 7 Jul 2020 11:03:54 -0700, Randy Dunlap wrote:

> Drop doubled words in various parts of Documentation/.
> 
> [...]

Applied to 5.9/scsi-queue, thanks!

[17/20] scsi: advansys: docs: Eliminate duplicated word
https://git.kernel.org/mkp/scsi/c/3010dfb0b77c

-- 
Martin K. Petersen  Oracle Linux Engineering

RE: FSL P5020/P5040: DPAA Ethernet issue with the latest Git kernel

[Madalin Bucur (OSS)]

> From: Christian Zigotzky  
> Sent: Tuesday, July 7, 2020 9:26 PM
> To: Madalin Bucur (OSS) 
> Cc: mad skateman ; Camelia Alexandra Groza 
> ;
> linuxppc-...@ozlabs.org; net...@vger.kernel.org; R.T.Dickinson 
> ;
> Darren Stevens 
> Subject: Re: FSL P5020/P5040: DPAA Ethernet issue with the latest Git kernel
>
>
> On 7. Jul 2020, at 17:53, Madalin Bucur (OSS) 
>  wrote:
> Was DPAA functional before commit A?
> How about after commit A and before commit B?

> The DPAA Ethernet works from  the kernel 5.6-rc4 [1] till the Git kernel from 
> the
> 11 of June [2]. It doesn’t work since the commit “fix bitmap_parse” [3].

> [1] https://forum.hyperion-entertainment.com/viewtopic.php?p=49936#p49936
> [2] https://forum.hyperion-entertainment.com/viewtopic.php?p=50848#p50848
> [3] https://forum.hyperion-entertainment.com/viewtopic.php?p=50980#p50980

Hi,

can you please try to disable the network manager (see [1]), then boot with
the latest kernel, that does not work, and setup the interfaces manually?

Madalin

[1] 
https://help.ubuntu.com/community/NetworkManager#Stopping_and_Disabling_NetworkManager

Re: [PATCH 06/20] Documentation: gpu/komeda-kms: eliminate duplicated word

[james qian wang (Arm Technology China)]

Hi Randy

On Tue, Jul 07, 2020 at 11:04:00AM -0700, Randy Dunlap wrote:
> Drop the doubled word "and".
> 
> Signed-off-by: Randy Dunlap 
> Cc: Jonathan Corbet 
> Cc: linux-...@vger.kernel.org
> Cc: James (Qian) Wang 
> Cc: Liviu Dudau 
> Cc: Mihail Atanassov 
> Cc: Mali DP Maintainers 
> ---
>  Documentation/gpu/komeda-kms.rst |2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- linux-next-20200701.orig/Documentation/gpu/komeda-kms.rst
> +++ linux-next-20200701/Documentation/gpu/komeda-kms.rst
> @@ -41,7 +41,7 @@ Compositor blends multiple layers or pix
>  frame. its output frame can be fed into post image processor for showing it 
> on
>  the monitor or fed into wb_layer and written to memory at the same time.
>  user can also insert a scaler between compositor and wb_layer to down scale
> -the display frame first and and then write to memory.
> +the display frame first and then write to memory.

Thank you for the patch.

Reviewed-by: James Qian Wang 

>  Writeback Layer (wb_layer)
>  --

Re: [PATCH] powerpc: select ARCH_HAS_MEMBARRIER_SYNC_CORE

[Nicholas Piggin]

Excerpts from Mathieu Desnoyers's message of July 7, 2020 9:25 pm:
> - On Jul 7, 2020, at 1:50 AM, Nicholas Piggin npig...@gmail.com wrote:
> 
>> Excerpts from Christophe Leroy's message of July 6, 2020 7:53 pm:
>>> 
>>> 
>>> Le 06/07/2020 à 04:18, Nicholas Piggin a écrit :
 diff --git a/arch/powerpc/include/asm/exception-64s.h
 b/arch/powerpc/include/asm/exception-64s.h
 index 47bd4ea0837d..b88cb3a989b6 100644
 --- a/arch/powerpc/include/asm/exception-64s.h
 +++ b/arch/powerpc/include/asm/exception-64s.h
 @@ -68,6 +68,10 @@
*
* The nop instructions allow us to insert one or more instructions to 
 flush the
* L1-D cache when returning to userspace or a guest.
 + *
 + * powerpc relies on return from interrupt/syscall being context 
 synchronising
 + * (which hrfid, rfid, and rfscv are) to support 
 ARCH_HAS_MEMBARRIER_SYNC_CORE
 + * without additional additional synchronisation instructions.
>>> 
>>> This file is dedicated to BOOK3S/64. What about other ones ?
>>> 
>>> On 32 bits, this is also valid as 'rfi' is also context synchronising,
>>> but then why just add some comment in exception-64s.h and only there ?
>> 
>> Yeah you're right, I basically wanted to keep a note there just in case,
>> because it's possible we would get a less synchronising return (maybe
>> unlikely with meltdown) or even return from a kernel interrupt using a
>> something faster (e.g., bctar if we don't use tar register in the kernel
>> anywhere).
>> 
>> So I wonder where to add the note, entry_32.S and 64e.h as well?
>> 
> 
> For 64-bit powerpc, I would be tempted to either place the comment in the 
> header
> implementing the RFI_TO_USER and RFI_TO_USER_OR_KERNEL macros or the .S files
> using them, e.g. either:
> 
> arch/powerpc/include/asm/exception-64e.h
> arch/powerpc/include/asm/exception-64s.h
> 
> or
> 
> arch/powerpc/kernel/exceptions-64s.S
> arch/powerpc/kernel/entry_64.S
> 
> And for 32-bit powerpc, AFAIU
> 
> arch/powerpc/kernel/entry_32.S
> 
> uses SYNC + RFI to return to user-space. RFI is defined in
> 
> arch/powerpc/include/asm/ppc_asm.h
> 
> So a comment either near the RFI define and its uses should work.
> 
>> I should actually change the comment for 64-bit because soft masked
>> interrupt replay is an interesting case. I thought it was okay (because
>> the IPI would cause a hard interrupt which does do the rfi) but that
>> should at least be written.
> 
> Yes.
> 
>> The context synchronisation happens before
>> the Linux IPI function is called, but for the purpose of membarrier I
>> think that is okay (the membarrier just needs to have caused a memory
>> barrier + context synchronistaion by the time it has done).
> 
> Can you point me to the code implementing this logic ?

It's mostly in arch/powerpc/kernel/exception-64s.S and 
powerpc/kernel/irq.c, but a lot of asm so easier to explain.

When any Linux code does local_irq_disable(), we set interrupts as 
software-masked in a per-cpu flag. When interrupts (including IPIs) come
in, the first thing we do is check that flag and if we are masked, then
record that the interrupt needs to be "replayed" in another per-cpu 
flag. The interrupt handler then exits back using RFI (which is context 
synchronising the CPU). Later, when the kernel code does 
local_irq_enable(), it checks the replay flag to see if anything needs 
to be done. At that point we basically just call the interrupt handler 
code like a normal function, and when that returns there is no context
synchronising instruction.

So membarrier IPI will always cause target CPUs to perform a context
synchronising instruction, but sometimes it happens before the IPI 
handler function runs.

Thanks,
Nick

Re: Using Firefox hangs system

[Nicholas Piggin]

Excerpts from Paul Menzel's message of July 8, 2020 3:42 am:
> Dear Nicholas,
> 
> 
> Am 07.07.20 um 09:03 schrieb Nicholas Piggin:
>> Excerpts from Paul Menzel's message of July 6, 2020 3:20 pm:
> 
>>> Am 06.07.20 um 02:41 schrieb Nicholas Piggin:
 Excerpts from Paul Menzel's message of July 5, 2020 8:30 pm:
>>>
> Am 05.07.20 um 11:22 schrieb Paul Menzel:
>> [  572.253008] Oops: Exception in kernel mode, sig: 5 [#1]
>> [  572.253198] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
>> [  572.253232] Modules linked in: tcp_diag inet_diag unix_diag 
>> xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 
>> xt_tcpudp ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat 
>> nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables nfnetlink 
>> ip6table_filter ip6_tables iptable_filter bridge stp llc overlay xfs 
>> kvm_hv kvm binfmt_misc joydev uas usb_storage vmx_crypto bnx2x 
>> crct10dif_vpmsum ofpart cmdlinepart powernv_flash mtd mdio ibmpowernv 
>> at24 ipmi_powernv ipmi_devintf ipmi_msghandler opal_prd powernv_rng 
>> sch_fq_codel parport_pc ppdev lp nfsd parport auth_rpcgss nfs_acl lockd 
>> grace sunrpc ip_tables x_tables autofs4 btrfs blake2b_generic libcrc32c 
>> xor zstd_compress raid6_pq input_leds mac_hid hid_generic ast 
>> drm_vram_helper drm_ttm_helper i2c_algo_bit ttm drm_kms_helper 
>> syscopyarea sysfillrect sysimgblt fb_sys_fops drm ahci 
>> drm_panel_orientation_quirks libahci usbhid hid crc32c_vpmsum 
>> uio_pdrv_genirq uio
>> [  572.253639] CPU: 4 PID: 6728 Comm: Web Content Not tainted 5.8.0-rc3+ 
>> #1
>> [  572.253659] NIP:  c000ff5c LR: c001a8f8 CTR: 
>> c01d5f00
>> [  572.253835] REGS: c07f31f0f420 TRAP: 1500   Not tainted  
>> (5.8.0-rc3+)
>> [  572.253854] MSR:  9290b033 
>>   CR: 28c48482  XER: 2000
>> [  572.253888] CFAR: c000fecc IRQMASK: 1
>> [  572.253888] GPR00: c001b228 c07f31f0f6b0 c1f9a900 
>> c07f351544d0
>> [  572.253888] GPR04:  c07f31f0fe90 c07f351544f0 
>> c07f32e522b0
>> [  572.253888] GPR08:  2000 90009033 
>> c07fbcd85800
>> [  572.253888] GPR12: 8800 c07fb680 0005 
>> 0004
>> [  572.253888] GPR16: c07f35153800 c07f35154130 0005 
>> 0001
>> [  572.253888] GPR20: 0024 c07f32e51e68 c07f35154028 
>> 007fd8da
>> [  572.253888] GPR24: 007fd8da c07f351544d0 c07e9a4024d0 
>> c1665f18
>> [  572.253888] GPR28: c07f351544d0 c07f35153800 9290f033 
>> c07f35153800
>> [  572.254079] NIP [c000ff5c] save_fpu+0xa8/0x2ac
>> [  572.254098] LR [c001a8f8] __giveup_fpu+0x28/0x80
>> [  572.254114] Call Trace:
>> [  572.254128] [c07f31f0f6b0] [c07f35153980] 0xc07f35153980 
>> (unreliable)
>> [  572.254156] [c07f31f0f6e0] [c001b228] 
>> giveup_all+0x128/0x150
>> [  572.254327] [c07f31f0f710] [c001c124] 
>> __switch_to+0x104/0x490
>> [  572.254352] [c07f31f0f770] [c10d2e34] 
>> __schedule+0x2e4/0xa10
>> [  572.254374] [c07f31f0f840] [c10d35d4] schedule+0x74/0x140
>> [  572.254397] [c07f31f0f870] [c10d9478] 
>> schedule_timeout+0x358/0x5d0
>> [  572.254424] [c07f31f0f980] [c10d5638] 
>> wait_for_completion+0xc8/0x210
>> [  572.254451] [c07f31f0fa00] [c0608ed4] 
>> do_coredump+0x3a4/0xd60
>> [  572.254625] [c07f31f0fba0] [c018d1cc] 
>> get_signal+0x1dc/0xd00
>> [  572.254648] [c07f31f0fcc0] [c001f088] 
>> do_notify_resume+0x158/0x450
>> [  572.254672] [c07f31f0fda0] [c0037d04] 
>> interrupt_exit_user_prepare+0x1c4/0x230
>> [  572.254699] [c07f31f0fe20] [c000f2b4] 
>> interrupt_return+0x14/0x1c0
>> [  572.254720] Instruction dump:
>> [  572.254882] dae60170 db060180 db260190 db4601a0 db6601b0 db8601c0 
>> dba601d0 dbc601e0
>> [  572.254912] dbe601f0 48000204 3880 f250 <7c062798> f250 
>> 38800010 f0210a50
>> [  572.254946] ---[ end trace ba4452ee5c77d58e ]---
>
> Please find all the messages attached.

 "Oops: Exception in kernel mode, sig: 5 [#1]"

 Unfortunately it's a very poor error message. I think it is a 0x1500
 exception triggering in the kernel FP register saving. Do you have the
 CONFIG_PPC_DENORMALISATION config option set?
>>>
>>> Yes, as it’s set in the Ubuntu Linux kernel configuration, I have it set
>>> too.
>>>
>>>   $ grep DENORMALI /boot/config-*
>>>   /boot/config-4.15.0-23-generic:CONFIG_PPC_DENORMALISATION=y
>>>   /boot/config-5.4.0-40-generic:CONFIG_

Re: [PATCH v3 0/6] powerpc: queued spinlocks and rwlocks

[Nicholas Piggin]

Excerpts from Waiman Long's message of July 8, 2020 1:33 pm:
> On 7/7/20 1:57 AM, Nicholas Piggin wrote:
>> Yes, powerpc could certainly get more performance out of the slow
>> paths, and then there are a few parameters to tune.
>>
>> We don't have a good alternate patching for function calls yet, but
>> that would be something to do for native vs pv.
>>
>> And then there seem to be one or two tunable parameters we could
>> experiment with.
>>
>> The paravirt locks may need a bit more tuning. Some simple testing
>> under KVM shows we might be a bit slower in some cases. Whether this
>> is fairness or something else I'm not sure. The current simple pv
>> spinlock code can do a directed yield to the lock holder CPU, whereas
>> the pv qspl here just does a general yield. I think we might actually
>> be able to change that to also support directed yield. Though I'm
>> not sure if this is actually the cause of the slowdown yet.
> 
> Regarding the paravirt lock, I have taken a further look into the 
> current PPC spinlock code. There is an equivalent of pv_wait() but no 
> pv_kick(). Maybe PPC doesn't really need that.

So powerpc has two types of wait, either undirected "all processors" or 
directed to a specific processor which has been preempted by the 
hypervisor.

The simple spinlock code does a directed wait, because it knows the CPU 
which is holding the lock. In this case, there is a sequence that is 
used to ensure we don't wait if the condition has become true, and the
target CPU does not need to kick the waiter it will happen automatically
(see splpar_spin_yield). This is preferable because we only wait as 
needed and don't require the kick operation.

The pv spinlock code I did uses the undirected wait, because we don't
know the CPU number which we are waiting on. This is undesirable because 
it's higher overhead and the wait is not so accurate.

I think perhaps we could change things so we wait on the correct CPU 
when queued, which might be good enough (we could also put the lock
owner CPU in the spinlock word, if we add another format).

> Attached are two 
> additional qspinlock patches that adds a CONFIG_PARAVIRT_QSPINLOCKS_LITE 
> option to not require pv_kick(). There is also a fixup patch to be 
> applied after your patchset.
> 
> I don't have access to a PPC LPAR with shared processor at the moment, 
> so I can't test the performance of the paravirt code. Would you mind 
> adding my patches and do some performance test on your end to see if it 
> gives better result?

Great, I'll do some tests. Any suggestions for what to try?

Thanks,
Nick

[PATCH v3 9/9] powerpc/watchpoint: Remove 512 byte boundary

[Ravi Bangoria]

Power10 has removed 512 bytes boundary from match criteria. i.e. The watch
range can cross 512 bytes boundary.

Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/kernel/hw_breakpoint.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/hw_breakpoint.c 
b/arch/powerpc/kernel/hw_breakpoint.c
index 7a66c370a105..270fbb4d01ce 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -418,8 +418,9 @@ static int hw_breakpoint_validate_len(struct 
arch_hw_breakpoint *hw)
 
if (dawr_enabled()) {
max_len = DAWR_MAX_LEN;
-   /* DAWR region can't cross 512 bytes boundary */
-   if (ALIGN_DOWN(start_addr, SZ_512) != ALIGN_DOWN(end_addr - 1, 
SZ_512))
+   /* DAWR region can't cross 512 bytes boundary on p10 
predecessors */
+   if (!cpu_has_feature(CPU_FTR_ARCH_31) &&
+   (ALIGN_DOWN(start_addr, SZ_512) != ALIGN_DOWN(end_addr - 1, 
SZ_512)))
return -EINVAL;
} else if (IS_ENABLED(CONFIG_PPC_8xx)) {
/* 8xx can setup a range without limitation */
-- 
2.26.2

[PATCH v3 8/9] powerpc/watchpoint: Return available watchpoints dynamically

[Ravi Bangoria]

So far Book3S Powerpc supported only one watchpoint. Power10 is
introducing 2nd DAWR. Enable 2nd DAWR support for Power10.
Availability of 2nd DAWR will depend on CPU_FTR_DAWR1.

Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/include/asm/cputable.h  | 4 +++-
 arch/powerpc/include/asm/hw_breakpoint.h | 5 +++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/cputable.h 
b/arch/powerpc/include/asm/cputable.h
index 3445c86e1f6f..36a0851a7a9b 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -633,7 +633,9 @@ enum {
  * Maximum number of hw breakpoint supported on powerpc. Number of
  * breakpoints supported by actual hw might be less than this.
  */
-#define HBP_NUM_MAX1
+#define HBP_NUM_MAX2
+#define HBP_NUM_ONE1
+#define HBP_NUM_TWO2
 
 #endif /* !__ASSEMBLY__ */
 
diff --git a/arch/powerpc/include/asm/hw_breakpoint.h 
b/arch/powerpc/include/asm/hw_breakpoint.h
index cb424799da0d..d4eab1694bcd 100644
--- a/arch/powerpc/include/asm/hw_breakpoint.h
+++ b/arch/powerpc/include/asm/hw_breakpoint.h
@@ -5,10 +5,11 @@
  * Copyright 2010, IBM Corporation.
  * Author: K.Prasad 
  */
-
 #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
 #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
 
+#include 
+
 #ifdef __KERNEL__
 struct arch_hw_breakpoint {
unsigned long   address;
@@ -46,7 +47,7 @@ struct arch_hw_breakpoint {
 
 static inline int nr_wp_slots(void)
 {
-   return HBP_NUM_MAX;
+   return cpu_has_feature(CPU_FTR_DAWR1) ? HBP_NUM_TWO : HBP_NUM_ONE;
 }
 
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
-- 
2.26.2

[PATCH v3 7/9] powerpc/watchpoint: Guest support for 2nd DAWR hcall

[Ravi Bangoria]

2nd DAWR can be set/unset using H_SET_MODE hcall with resource value 5.
Enable powervm guest support with that. This has no effect on kvm guest
because kvm will return error if guest does hcall with resource value 5.

Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/include/asm/hvcall.h | 1 +
 arch/powerpc/include/asm/machdep.h| 2 +-
 arch/powerpc/include/asm/plpar_wrappers.h | 5 +
 arch/powerpc/kernel/dawr.c| 2 +-
 arch/powerpc/platforms/pseries/setup.c| 7 +--
 5 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/hvcall.h 
b/arch/powerpc/include/asm/hvcall.h
index a7f6f1aeda6b..3f170b9496a1 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -357,6 +357,7 @@
 #define H_SET_MODE_RESOURCE_SET_DAWR0  2
 #define H_SET_MODE_RESOURCE_ADDR_TRANS_MODE3
 #define H_SET_MODE_RESOURCE_LE 4
+#define H_SET_MODE_RESOURCE_SET_DAWR1  5
 
 /* Values for argument to H_SIGNAL_SYS_RESET */
 #define H_SIGNAL_SYS_RESET_ALL -1
diff --git a/arch/powerpc/include/asm/machdep.h 
b/arch/powerpc/include/asm/machdep.h
index 7bcb6a39..a90b892f0bfe 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -131,7 +131,7 @@ struct machdep_calls {
unsigned long dabrx);
 
/* Set DAWR for this platform, leave empty for default implementation */
-   int (*set_dawr)(unsigned long dawr,
+   int (*set_dawr)(int nr, unsigned long dawr,
unsigned long dawrx);
 
 #ifdef CONFIG_PPC32/* XXX for now */
diff --git a/arch/powerpc/include/asm/plpar_wrappers.h 
b/arch/powerpc/include/asm/plpar_wrappers.h
index 93eb133d572c..d7a1acc83593 100644
--- a/arch/powerpc/include/asm/plpar_wrappers.h
+++ b/arch/powerpc/include/asm/plpar_wrappers.h
@@ -315,6 +315,11 @@ static inline long plpar_set_watchpoint0(unsigned long 
dawr0, unsigned long dawr
return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_DAWR0, dawr0, dawrx0);
 }
 
+static inline long plpar_set_watchpoint1(unsigned long dawr1, unsigned long 
dawrx1)
+{
+   return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_DAWR1, dawr1, dawrx1);
+}
+
 static inline long plpar_signal_sys_reset(long cpu)
 {
return plpar_hcall_norets(H_SIGNAL_SYS_RESET, cpu);
diff --git a/arch/powerpc/kernel/dawr.c b/arch/powerpc/kernel/dawr.c
index 500f52fa4711..cdc2dccb987d 100644
--- a/arch/powerpc/kernel/dawr.c
+++ b/arch/powerpc/kernel/dawr.c
@@ -37,7 +37,7 @@ int set_dawr(int nr, struct arch_hw_breakpoint *brk)
dawrx |= (mrd & 0x3f) << (63 - 53);
 
if (ppc_md.set_dawr)
-   return ppc_md.set_dawr(dawr, dawrx);
+   return ppc_md.set_dawr(nr, dawr, dawrx);
 
if (nr == 0) {
mtspr(SPRN_DAWR0, dawr);
diff --git a/arch/powerpc/platforms/pseries/setup.c 
b/arch/powerpc/platforms/pseries/setup.c
index 2db8469e475f..d516ee8eb7fc 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -831,12 +831,15 @@ static int pseries_set_xdabr(unsigned long dabr, unsigned 
long dabrx)
return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 }
 
-static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
+static int pseries_set_dawr(int nr, unsigned long dawr, unsigned long dawrx)
 {
/* PAPR says we can't set HYP */
dawrx &= ~DAWRX_HYP;
 
-   return  plpar_set_watchpoint0(dawr, dawrx);
+   if (nr == 0)
+   return plpar_set_watchpoint0(dawr, dawrx);
+   else
+   return plpar_set_watchpoint1(dawr, dawrx);
 }
 
 #define CMO_CHARACTERISTICS_TOKEN 44
-- 
2.26.2

[PATCH v3 6/9] powerpc/watchpoint: Rename current H_SET_MODE DAWR macro

[Ravi Bangoria]

Current H_SET_MODE hcall macro name for setting/resetting DAWR0 is
H_SET_MODE_RESOURCE_SET_DAWR. Add suffix 0 to macro name as well.

Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/include/asm/hvcall.h | 2 +-
 arch/powerpc/include/asm/plpar_wrappers.h | 2 +-
 arch/powerpc/kvm/book3s_hv.c  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/hvcall.h 
b/arch/powerpc/include/asm/hvcall.h
index e90c073e437e..a7f6f1aeda6b 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -354,7 +354,7 @@
 
 /* Values for 2nd argument to H_SET_MODE */
 #define H_SET_MODE_RESOURCE_SET_CIABR  1
-#define H_SET_MODE_RESOURCE_SET_DAWR   2
+#define H_SET_MODE_RESOURCE_SET_DAWR0  2
 #define H_SET_MODE_RESOURCE_ADDR_TRANS_MODE3
 #define H_SET_MODE_RESOURCE_LE 4
 
diff --git a/arch/powerpc/include/asm/plpar_wrappers.h 
b/arch/powerpc/include/asm/plpar_wrappers.h
index 4497c8afb573..93eb133d572c 100644
--- a/arch/powerpc/include/asm/plpar_wrappers.h
+++ b/arch/powerpc/include/asm/plpar_wrappers.h
@@ -312,7 +312,7 @@ static inline long plpar_set_ciabr(unsigned long ciabr)
 
 static inline long plpar_set_watchpoint0(unsigned long dawr0, unsigned long 
dawrx0)
 {
-   return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_DAWR, dawr0, dawrx0);
+   return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_DAWR0, dawr0, dawrx0);
 }
 
 static inline long plpar_signal_sys_reset(long cpu)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 6bf66649ab92..7ad692c2d7c7 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -764,7 +764,7 @@ static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, 
unsigned long mflags,
return H_P3;
vcpu->arch.ciabr  = value1;
return H_SUCCESS;
-   case H_SET_MODE_RESOURCE_SET_DAWR:
+   case H_SET_MODE_RESOURCE_SET_DAWR0:
if (!kvmppc_power8_compatible(vcpu))
return H_P2;
if (!ppc_breakpoint_available())
-- 
2.26.2

[PATCH v3 5/9] powerpc/watchpoint: Set CPU_FTR_DAWR1 based on pa-features bit

[Ravi Bangoria]

As per the PAPR, bit 0 of byte 64 in pa-features property indicates
availability of 2nd DAWR registers. i.e. If this bit is set, 2nd
DAWR is present, otherwise not. Host generally uses "cpu-features",
which masks "pa-features". But "cpu-features" are still not used for
guests and thus this change is mostly applicable for guests only.

Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/kernel/prom.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 9cc49f265c86..c76c09b97bc8 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -175,6 +175,8 @@ static struct ibm_pa_feature {
 */
{ .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP,
  .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP 
},
+
+   { .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 },
 };
 
 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
-- 
2.26.2

[PATCH v3 4/9] powerpc/dt_cpu_ftrs: Add feature for 2nd DAWR

[Ravi Bangoria]

Add new device-tree feature for 2nd DAWR. If this feature is present,
2nd DAWR is supported, otherwise not.

Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/include/asm/cputable.h | 7 +--
 arch/powerpc/kernel/dt_cpu_ftrs.c   | 7 +++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/cputable.h 
b/arch/powerpc/include/asm/cputable.h
index e506d429b1af..3445c86e1f6f 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -214,6 +214,7 @@ static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTR_P9_TLBIE_ERAT_BUG  LONG_ASM_CONST(0x0001)
 #define CPU_FTR_P9_RADIX_PREFETCH_BUG  LONG_ASM_CONST(0x0002)
 #define CPU_FTR_ARCH_31
LONG_ASM_CONST(0x0004)
+#define CPU_FTR_DAWR1  LONG_ASM_CONST(0x0008)
 
 #ifndef __ASSEMBLY__
 
@@ -497,14 +498,16 @@ static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTRS_POSSIBLE  \
(CPU_FTRS_POWER7 | CPU_FTRS_POWER8E | CPU_FTRS_POWER8 | \
 CPU_FTR_ALTIVEC_COMP | CPU_FTR_VSX_COMP | CPU_FTRS_POWER9 | \
-CPU_FTRS_POWER9_DD2_1 | CPU_FTRS_POWER9_DD2_2 | CPU_FTRS_POWER10)
+CPU_FTRS_POWER9_DD2_1 | CPU_FTRS_POWER9_DD2_2 | CPU_FTRS_POWER10 | 
\
+CPU_FTR_DAWR1)
 #else
 #define CPU_FTRS_POSSIBLE  \
(CPU_FTRS_PPC970 | CPU_FTRS_POWER5 | \
 CPU_FTRS_POWER6 | CPU_FTRS_POWER7 | CPU_FTRS_POWER8E | \
 CPU_FTRS_POWER8 | CPU_FTRS_CELL | CPU_FTRS_PA6T | \
 CPU_FTR_VSX_COMP | CPU_FTR_ALTIVEC_COMP | CPU_FTRS_POWER9 | \
-CPU_FTRS_POWER9_DD2_1 | CPU_FTRS_POWER9_DD2_2 | CPU_FTRS_POWER10)
+CPU_FTRS_POWER9_DD2_1 | CPU_FTRS_POWER9_DD2_2 | CPU_FTRS_POWER10 | 
\
+CPU_FTR_DAWR1)
 #endif /* CONFIG_CPU_LITTLE_ENDIAN */
 #endif
 #else
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c 
b/arch/powerpc/kernel/dt_cpu_ftrs.c
index a0edeb391e3e..be694567cebd 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -573,6 +573,12 @@ static int __init feat_enable_mma(struct dt_cpu_feature *f)
return 1;
 }
 
+static int __init feat_enable_debug_facilities_v31(struct dt_cpu_feature *f)
+{
+   cur_cpu_spec->cpu_features |= CPU_FTR_DAWR1;
+   return 1;
+}
+
 struct dt_cpu_feature_match {
const char *name;
int (*enable)(struct dt_cpu_feature *f);
@@ -648,6 +654,7 @@ static struct dt_cpu_feature_match __initdata
{"wait-v3", feat_enable, 0},
{"prefix-instructions", feat_enable, 0},
{"matrix-multiply-assist", feat_enable_mma, 0},
+   {"debug-facilities-v31", feat_enable_debug_facilities_v31, 0},
 };
 
 static bool __initdata using_dt_cpu_ftrs;
-- 
2.26.2

[PATCH v3 3/9] powerpc/watchpoint: Enable watchpoint functionality on power10 guest

[Ravi Bangoria]

CPU_FTR_DAWR is by default enabled for host via CPU_FTRS_DT_CPU_BASE
(controlled by CONFIG_PPC_DT_CPU_FTRS). But cpu-features device-tree
node is not PAPR compatible and thus not yet used by kvm or pHyp
guests. Enable watchpoint functionality on power10 guest (both kvm
and powervm) by adding CPU_FTR_DAWR to CPU_FTRS_POWER10. Note that
this change does not enable 2nd DAWR support.

Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/include/asm/cputable.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/cputable.h 
b/arch/powerpc/include/asm/cputable.h
index bac2252c839e..e506d429b1af 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -478,7 +478,7 @@ static inline void cpu_feature_keys_init(void) { }
CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
CPU_FTR_DBELL | CPU_FTR_HAS_PPR | CPU_FTR_ARCH_207S | \
CPU_FTR_TM_COMP | CPU_FTR_ARCH_300 | CPU_FTR_PKEY | \
-   CPU_FTR_ARCH_31)
+   CPU_FTR_ARCH_31 | CPU_FTR_DAWR)
 #define CPU_FTRS_CELL  (CPU_FTR_LWSYNC | \
CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \
-- 
2.26.2

[PATCH v3 2/9] powerpc/watchpoint: Fix DAWR exception constraint

[Ravi Bangoria]

Pedro Miraglia Franco de Carvalho noticed that on p8, DAR value is
inconsistent with different type of load/store. Like for byte,word
etc. load/stores, DAR is set to the address of the first byte of
overlap between watch range and real access. But for quadword load/
store it's set to the address of the first byte of real access. This
issue has been fixed in p10. In p10(ISA 3.1), DAR is always set to
the address of the first byte of overlap. Commit 27985b2a640e
("powerpc/watchpoint: Don't ignore extraneous exceptions blindly")
wrongly assumes that DAR is set to the address of the first byte of
overlap for all load/stores on p8 as well. Fix that. With the fix,
we now rely on 'ea' provided by analyse_instr(). If analyse_instr()
fails, generate event unconditionally on p8, and on p10 generate
event only if DAR is within a DAWR range.

Note: 8xx is not affected.

Fixes: 27985b2a640e ("powerpc/watchpoint: Don't ignore extraneous exceptions 
blindly")
Fixes: 74c6881019b7 ("powerpc/watchpoint: Prepare handler to handle more than 
one watchpoint")
Reported-by: Pedro Miraglia Franco de Carvalho 
Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/kernel/hw_breakpoint.c | 93 +++--
 1 file changed, 63 insertions(+), 30 deletions(-)

diff --git a/arch/powerpc/kernel/hw_breakpoint.c 
b/arch/powerpc/kernel/hw_breakpoint.c
index 031e6defc08e..7a66c370a105 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -498,11 +498,11 @@ static bool dar_in_user_range(unsigned long dar, struct 
arch_hw_breakpoint *info
return ((info->address <= dar) && (dar - info->address < info->len));
 }
 
-static bool dar_user_range_overlaps(unsigned long dar, int size,
-   struct arch_hw_breakpoint *info)
+static bool ea_user_range_overlaps(unsigned long ea, int size,
+  struct arch_hw_breakpoint *info)
 {
-   return ((dar < info->address + info->len) &&
-   (dar + size > info->address));
+   return ((ea < info->address + info->len) &&
+   (ea + size > info->address));
 }
 
 static bool dar_in_hw_range(unsigned long dar, struct arch_hw_breakpoint *info)
@@ -515,20 +515,22 @@ static bool dar_in_hw_range(unsigned long dar, struct 
arch_hw_breakpoint *info)
return ((hw_start_addr <= dar) && (hw_end_addr > dar));
 }
 
-static bool dar_hw_range_overlaps(unsigned long dar, int size,
- struct arch_hw_breakpoint *info)
+static bool ea_hw_range_overlaps(unsigned long ea, int size,
+struct arch_hw_breakpoint *info)
 {
unsigned long hw_start_addr, hw_end_addr;
 
hw_start_addr = ALIGN_DOWN(info->address, HW_BREAKPOINT_SIZE);
hw_end_addr = ALIGN(info->address + info->len, HW_BREAKPOINT_SIZE);
 
-   return ((dar < hw_end_addr) && (dar + size > hw_start_addr));
+   return ((ea < hw_end_addr) && (ea + size > hw_start_addr));
 }
 
 /*
  * If hw has multiple DAWR registers, we also need to check all
  * dawrx constraint bits to confirm this is _really_ a valid event.
+ * If type is UNKNOWN, but privilege level matches, consider it as
+ * a positive match.
  */
 static bool check_dawrx_constraints(struct pt_regs *regs, int type,
struct arch_hw_breakpoint *info)
@@ -536,7 +538,12 @@ static bool check_dawrx_constraints(struct pt_regs *regs, 
int type,
if (OP_IS_LOAD(type) && !(info->type & HW_BRK_TYPE_READ))
return false;
 
-   if (OP_IS_STORE(type) && !(info->type & HW_BRK_TYPE_WRITE))
+   /*
+* The Cache Management instructions other than dcbz never
+* cause a match. i.e. if type is CACHEOP, the instruction
+* is dcbz, and dcbz is treated as Store.
+*/
+   if ((OP_IS_STORE(type) || type == CACHEOP) && !(info->type & 
HW_BRK_TYPE_WRITE))
return false;
 
if (is_kernel_addr(regs->nip) && !(info->type & HW_BRK_TYPE_KERNEL))
@@ -553,7 +560,8 @@ static bool check_dawrx_constraints(struct pt_regs *regs, 
int type,
  * including extraneous exception. Otherwise return false.
  */
 static bool check_constraints(struct pt_regs *regs, struct ppc_inst instr,
- int type, int size, struct arch_hw_breakpoint 
*info)
+ unsigned long ea, int type, int size,
+ struct arch_hw_breakpoint *info)
 {
bool in_user_range = dar_in_user_range(regs->dar, info);
bool dawrx_constraints;
@@ -569,11 +577,10 @@ static bool check_constraints(struct pt_regs *regs, 
struct ppc_inst instr,
}
 
if (unlikely(ppc_inst_equal(instr, ppc_inst(0 {
-   if (in_user_range)
-   return true;
-
-   if (dar_in_hw_range(regs->dar, info)) {
-   info->type |= HW_BRK_TYPE_EXTRANEOUS_IRQ;
+   if (cpu_has_feature(CPU_FTR_ARCH_31)) {
+  

[PATCH v3 1/9] powerpc/watchpoint: Fix 512 byte boundary limit

[Ravi Bangoria]

Milton Miller reported that we are aligning start and end address to
wrong size SZ_512M. It should be SZ_512. Fix that.

While doing this change I also found a case where ALIGN() comparison
fails. Within a given aligned range, ALIGN() of two addresses does not
match when start address is pointing to the first byte and end address
is pointing to any other byte except the first one. But that's not true
for ALIGN_DOWN(). ALIGN_DOWN() of any two addresses within that range
will always point to the first byte. So use ALIGN_DOWN() instead of
ALIGN().

Fixes: e68ef121c1f4 ("powerpc/watchpoint: Use builtin ALIGN*() macros")
Reported-by: Milton Miller 
Signed-off-by: Ravi Bangoria 
---
 arch/powerpc/kernel/hw_breakpoint.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/hw_breakpoint.c 
b/arch/powerpc/kernel/hw_breakpoint.c
index daf0e1da..031e6defc08e 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -419,7 +419,7 @@ static int hw_breakpoint_validate_len(struct 
arch_hw_breakpoint *hw)
if (dawr_enabled()) {
max_len = DAWR_MAX_LEN;
/* DAWR region can't cross 512 bytes boundary */
-   if (ALIGN(start_addr, SZ_512M) != ALIGN(end_addr - 1, SZ_512M))
+   if (ALIGN_DOWN(start_addr, SZ_512) != ALIGN_DOWN(end_addr - 1, 
SZ_512))
return -EINVAL;
} else if (IS_ENABLED(CONFIG_PPC_8xx)) {
/* 8xx can setup a range without limitation */
-- 
2.26.2

[PATCH v3 0/9] powerpc/watchpoint: Enable 2nd DAWR on baremetal and powervm

[Ravi Bangoria]

Last series[1] was to add basic infrastructure support for more than
one watchpoint on Book3S powerpc. This series actually enables the 2nd 
DAWR for baremetal and powervm. Kvm guest is still not supported.

v2: 
https://lore.kernel.org/linuxppc-dev/20200604033443.70591-1-ravi.bango...@linux.ibm.com/

v2->v3:
 - patch #2 is new. It fixes an issue with DAWR exception constraint
 - Rename dawr1 to debug-facilities-v31 in dt cpu feature, suggested
   by Nick Piggin.
 - Rebased to powerpc/next

[1]: 
https://lore.kernel.org/linuxppc-dev/20200514111741.97993-1-ravi.bango...@linux.ibm.com/

Ravi Bangoria (9):
  powerpc/watchpoint: Fix 512 byte boundary limit
  powerpc/watchpoint: Fix DAWR exception constraint
  powerpc/watchpoint: Enable watchpoint functionality on power10 guest
  powerpc/dt_cpu_ftrs: Add feature for 2nd DAWR
  powerpc/watchpoint: Set CPU_FTR_DAWR1 based on pa-features bit
  powerpc/watchpoint: Rename current H_SET_MODE DAWR macro
  powerpc/watchpoint: Guest support for 2nd DAWR hcall
  powerpc/watchpoint: Return available watchpoints dynamically
  powerpc/watchpoint: Remove 512 byte boundary

 arch/powerpc/include/asm/cputable.h   | 13 ++-
 arch/powerpc/include/asm/hvcall.h |  3 +-
 arch/powerpc/include/asm/hw_breakpoint.h  |  5 +-
 arch/powerpc/include/asm/machdep.h|  2 +-
 arch/powerpc/include/asm/plpar_wrappers.h |  7 +-
 arch/powerpc/kernel/dawr.c|  2 +-
 arch/powerpc/kernel/dt_cpu_ftrs.c |  7 ++
 arch/powerpc/kernel/hw_breakpoint.c   | 98 +++
 arch/powerpc/kernel/prom.c|  2 +
 arch/powerpc/kvm/book3s_hv.c  |  2 +-
 arch/powerpc/platforms/pseries/setup.c|  7 +-
 11 files changed, 103 insertions(+), 45 deletions(-)

-- 
2.26.2

Re: [PATCH v2] powerpc/uaccess: Use flexible addressing with __put_user()/__get_user()

[Christophe Leroy]

Le 07/07/2020 à 21:02, Christophe Leroy a écrit :



Le 07/07/2020 à 14:44, Christophe Leroy a écrit :



Le 30/06/2020 à 03:19, Michael Ellerman a écrit :

Michael Ellerman  writes:

Christophe Leroy  writes:

Hi Michael,

I see this patch is marked as "defered" in patchwork, but I can't see
any related discussion. Is it normal ?


Because it uses the "m<>" constraint which didn't work on GCC 4.6.

https://github.com/linuxppc/issues/issues/297

So we should be able to pick it up for v5.9 hopefully.


It seems to break the build with the kernel.org 4.9.4 compiler and
corenet64_smp_defconfig:


Most likely a GCC bug ?

It seems the problem vanishes with patch 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/173de3b659fa3a5f126a0eb170522cccd909950f.1594125164.git.christophe.le...@csgroup.eu/ 



Same kind of issue in signal_64.c now.

The following patch fixes it: 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/810bd8840ef990a200f58c9dea9abe767ca02a3a.1594146723.git.christophe.le...@csgroup.eu/ 





This time I confirm, with the two above mentioned patches, it builds OK 
with 4.9, see 
http://kisskb.ellerman.id.au/kisskb/head/810bd8840ef990a200f58c9dea9abe767ca02a3a/


Christophe

Re: [PATCH v2 4/4] powerpc/mm/radix: Create separate mappings for hot-plugged memory

[Michael Ellerman]

"Aneesh Kumar K.V"  writes:
> To enable memory unplug without splitting kernel page table
> mapping, we force the max mapping size to the LMB size. LMB
> size is the unit in which hypervisor will do memory add/remove
> operation.
>
> This implies on pseries system, we now end up mapping

Please expand on why it "implies" that for pseries.

> memory with 2M page size instead of 1G. To improve
> that we want hypervisor to hint the kernel about the hotplug
> memory range.  This was added that as part of
 That
>
> commit b6eca183e23e ("powerpc/kernel: Enables memory
> hot-remove after reboot on pseries guests")
>
> But we still don't do that on PowerVM. Once we get PowerVM

I think you mean PowerVM doesn't provide that hint yet?

Realistically it won't until P10. So this means we'll always use 2MB on
Power9 PowerVM doesn't it?

What about KVM?

Have you done any benchmarking on the impact of switching the linear
mapping to 2MB pages?

> updated, we can then force the 2M mapping only to hot-pluggable
> memory region using memblock_is_hotpluggable(). Till then
> let's depend on LMB size for finding the mapping page size
> for linear range.
>
> Signed-off-by: Bharata B Rao 
> Signed-off-by: Aneesh Kumar K.V 
> ---
>  arch/powerpc/mm/book3s64/radix_pgtable.c | 83 
>  arch/powerpc/platforms/powernv/setup.c   | 10 ++-
>  2 files changed, 81 insertions(+), 12 deletions(-)
>
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c 
> b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index 78ad11812e0d..a4179e4da49d 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -15,6 +15,7 @@
>  #include 
>  #include 
>  #include 
> +#include 
>  
>  #include 
>  #include 
> @@ -34,6 +35,7 @@
>  
>  unsigned int mmu_pid_bits;
>  unsigned int mmu_base_pid;
> +unsigned int radix_mem_block_size;

static? __ro_after_init?

> @@ -266,6 +268,7 @@ static unsigned long next_boundary(unsigned long addr, 
> unsigned long end)
>  
>  static int __meminit create_physical_mapping(unsigned long start,
>unsigned long end,
> +  unsigned long max_mapping_size,
>int nid, pgprot_t _prot)
>  {
>   unsigned long vaddr, addr, mapping_size = 0;
> @@ -279,6 +282,8 @@ static int __meminit create_physical_mapping(unsigned 
> long start,
>   int rc;
>  
>   gap = next_boundary(addr, end) - addr;
> + if (gap > max_mapping_size)
> + gap = max_mapping_size;
>   previous_size = mapping_size;
>   prev_exec = exec;
>  
> @@ -329,8 +334,9 @@ static void __init radix_init_pgtable(void)
>  
>   /* We don't support slb for radix */
>   mmu_slb_size = 0;
> +
>   /*
> -  * Create the linear mapping, using standard page size for now
> +  * Create the linear mapping
>*/
>   for_each_memblock(memory, reg) {
>   /*
> @@ -346,6 +352,7 @@ static void __init radix_init_pgtable(void)
>  
>   WARN_ON(create_physical_mapping(reg->base,
>   reg->base + reg->size,
> + radix_mem_block_size,
>   -1, PAGE_KERNEL));
>   }
>  
> @@ -486,6 +493,49 @@ static int __init radix_dt_scan_page_sizes(unsigned long 
> node,
>   return 1;
>  }
>  
> +static int __init probe_memory_block_size(unsigned long node, const char 
> *uname, int
> +   depth, void *data)
> +{
> + const __be32 *block_size;
> + int len;
> +
> + if (depth != 1)
> + return 0;
> +
> + if (!strcmp(uname, "ibm,dynamic-reconfiguration-memory")) {

if (strcmp(uname, "ibm,dynamic-reconfiguration-memory") != 0)
return 0;

Then you can de-indent the rest of the body.


> + block_size = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
> + if (!block_size || len < dt_root_size_cells * sizeof(__be32))

This will give us a sparse warning, please do the endian conversion
before looking at the value.

> + /*
> +  * Nothing in the device tree
> +  */
> + return MIN_MEMORY_BLOCK_SIZE;

> +
> + return dt_mem_next_cell(dt_root_size_cells, &block_size);

Just of_read_number() ?

This is misusing the return value, as I explained on one of your other
recent patches. You should return !0 to indicate that scanning should
stop, and the actual value can go via the data pointer, or better just
set the global.


> + }
> +
> + return 0;
> +}
> +
> +static unsigned long radix_memory_block_size(void)
> +{
> + unsigned long mem_block_size = MIN_MEMORY_BLOCK_SIZE;

> +
> + if (firmware_has_feature(FW_FEATURE_OPAL)) {
> +
> + mem_block_size

Re: [PATCH v5 08/12] init: main: add KUnit to kernel init

[Luis Chamberlain]

On Fri, Jun 26, 2020 at 02:09:13PM -0700, Brendan Higgins wrote:
> Remove KUnit from init calls entirely, instead call directly from
> kernel_init().

The commit log does not explain *why*.

> Co-developed-by: Alan Maguire 
> Signed-off-by: Alan Maguire 
> Signed-off-by: Brendan Higgins 
> Reviewed-by: Stephen Boyd 

Other than that:

Reviewed-by: Luis Chamberlain 

  Luis

Re: [PATCH v5 01/12] vmlinux.lds.h: add linker section for KUnit test suites

[Luis Chamberlain]

On Fri, Jun 26, 2020 at 02:22:11PM -0700, Brendan Higgins wrote:
> On Fri, Jun 26, 2020 at 2:20 PM Kees Cook  wrote:
> >
> > On Fri, Jun 26, 2020 at 02:09:06PM -0700, Brendan Higgins wrote:
> > > Add a linker section where KUnit can put references to its test suites.
> > > This patch is the first step in transitioning to dispatching all KUnit
> > > tests from a centralized executor rather than having each as its own
> > > separate late_initcall.
> > >
> > > Co-developed-by: Iurii Zaikin 
> > > Signed-off-by: Iurii Zaikin 
> > > Signed-off-by: Brendan Higgins 
> > > Reviewed-by: Stephen Boyd 
> > > ---
> > >  include/asm-generic/vmlinux.lds.h | 8 
> > >  1 file changed, 8 insertions(+)
> > >
> > > diff --git a/include/asm-generic/vmlinux.lds.h 
> > > b/include/asm-generic/vmlinux.lds.h
> > > index db600ef218d7d..4f9b036fc9616 100644
> > > --- a/include/asm-generic/vmlinux.lds.h
> > > +++ b/include/asm-generic/vmlinux.lds.h
> > > @@ -881,6 +881,13 @@
> > >   KEEP(*(.con_initcall.init)) \
> > >   __con_initcall_end = .;
> > >
> > > +/* Alignment must be consistent with (kunit_suite *) in 
> > > include/kunit/test.h */
> >
> > Nit on naming:
> >
> > > +#define KUNIT_TEST_SUITES\
> >
> > I would call this KUNIT_TABLE to maintain the same names as other things
> > of this nature.
> >
> > > + . = ALIGN(8);   \
> > > + __kunit_suites_start = .;   \
> > > + KEEP(*(.kunit_test_suites)) \
> > > + __kunit_suites_end = .;
> > > +
> > >  #ifdef CONFIG_BLK_DEV_INITRD
> > >  #define INIT_RAM_FS  \
> > >   . = ALIGN(4);   \
> > > @@ -1056,6 +1063,7 @@
> > >   INIT_CALLS  \
> > >   CON_INITCALL\
> > >   INIT_RAM_FS \
> > > + KUNIT_TEST_SUITES   \
> > >   }
> >
> > Nack: this must be in INIT_DATA, not in INIT_DATA_SECTION. Not all
> > architectures use the INIT_DATA_SECTION macro (e.g. arm64), but everything
> > uses INIT_DATA.
> 
> Oh, maybe that would eliminate the need for the other linkerscript
> patches? That would be nice.

Curious, did changing it as Kees suggest fix it for m68k?

  Luis

Re: [PATCH v5 0/4] vmalloc kernel mapping and relocatable kernel

[Alex Ghiti]

Hi Palmer,

Le 6/7/20 à 3:59 AM, Alexandre Ghiti a écrit :

This patchset originally implemented relocatable kernel support but now
also moves the kernel mapping into the vmalloc zone.
  
The first patch explains why we need to move the kernel into vmalloc

zone (instead of memcpying it around). That patch should ease KASLR
implementation a lot.
  
The second patch allows to build relocatable kernels but is not selected

by default.
  
The third and fourth patches take advantage of an already existing powerpc

script that checks relocations at compile-time, and uses it for riscv.
  
Changes in v5:

   * Add "static __init" to create_kernel_page_table function as reported by
 Kbuild test robot
   * Add reviewed-by from Zong
   * Rebase onto v5.7

Changes in v4:
   * Fix BPF region that overlapped with kernel's as suggested by Zong
   * Fix end of module region that could be larger than 2GB as suggested by Zong
   * Fix the size of the vm area reserved for the kernel as we could lose
 PMD_SIZE if the size was already aligned on PMD_SIZE
   * Split compile time relocations check patch into 2 patches as suggested by 
Anup
   * Applied Reviewed-by from Zong and Anup
  
Changes in v3:

   * Move kernel mapping to vmalloc
  
Changes in v2:

   * Make RELOCATABLE depend on MMU as suggested by Anup
   * Rename kernel_load_addr into kernel_virt_addr as suggested by Anup
   * Use __pa_symbol instead of __pa, as suggested by Zong
   * Rebased on top of v5.6-rc3
   * Tested with sv48 patchset
   * Add Reviewed/Tested-by from Zong and Anup

Alexandre Ghiti (4):
   riscv: Move kernel mapping to vmalloc zone
   riscv: Introduce CONFIG_RELOCATABLE
   powerpc: Move script to check relocations at compile time in scripts/
   riscv: Check relocations at compile time

  arch/powerpc/tools/relocs_check.sh |  18 +
  arch/riscv/Kconfig |  12 +++
  arch/riscv/Makefile|   5 +-
  arch/riscv/Makefile.postlink   |  36 +
  arch/riscv/boot/loader.lds.S   |   3 +-
  arch/riscv/include/asm/page.h  |  10 ++-
  arch/riscv/include/asm/pgtable.h   |  38 ++---
  arch/riscv/kernel/head.S   |   3 +-
  arch/riscv/kernel/module.c |   4 +-
  arch/riscv/kernel/vmlinux.lds.S|   9 ++-
  arch/riscv/mm/Makefile |   4 +
  arch/riscv/mm/init.c   | 121 +
  arch/riscv/mm/physaddr.c   |   2 +-
  arch/riscv/tools/relocs_check.sh   |  26 +++
  scripts/relocs_check.sh|  20 +
  15 files changed, 259 insertions(+), 52 deletions(-)
  create mode 100644 arch/riscv/Makefile.postlink
  create mode 100755 arch/riscv/tools/relocs_check.sh
  create mode 100755 scripts/relocs_check.sh



Do you have any remark regarding this series ?

Thanks,

Alex

[Bug 208197] OF: /pci@f2000000/mac-io@17/gpio@50/...: could not find phandle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=208197

--- Comment #7 from Michael Ellerman (mich...@ellerman.id.au) ---
I couldn't really make sense of your bisect log, it doesn't have any good/bad
commits in it.

And I don't see how reverting a merge of v5.7-rc7 can be helping, because you
said v5.7 is good, and that contains v5.7-rc7.

Can you attach the output of "git bisect log".

-- 
You are receiving this mail because:
You are watching the assignee of the bug.

Re: [PATCH v3 0/6] powerpc: queued spinlocks and rwlocks

[Waiman Long]

On 7/7/20 1:57 AM, Nicholas Piggin wrote:

Yes, powerpc could certainly get more performance out of the slow
paths, and then there are a few parameters to tune.

We don't have a good alternate patching for function calls yet, but
that would be something to do for native vs pv.

And then there seem to be one or two tunable parameters we could
experiment with.

The paravirt locks may need a bit more tuning. Some simple testing
under KVM shows we might be a bit slower in some cases. Whether this
is fairness or something else I'm not sure. The current simple pv
spinlock code can do a directed yield to the lock holder CPU, whereas
the pv qspl here just does a general yield. I think we might actually
be able to change that to also support directed yield. Though I'm
not sure if this is actually the cause of the slowdown yet.


Regarding the paravirt lock, I have taken a further look into the 
current PPC spinlock code. There is an equivalent of pv_wait() but no 
pv_kick(). Maybe PPC doesn't really need that. Attached are two 
additional qspinlock patches that adds a CONFIG_PARAVIRT_QSPINLOCKS_LITE 
option to not require pv_kick(). There is also a fixup patch to be 
applied after your patchset.


I don't have access to a PPC LPAR with shared processor at the moment, 
so I can't test the performance of the paravirt code. Would you mind 
adding my patches and do some performance test on your end to see if it 
gives better result?


Thanks,
Longman

>From 161e545523a7eb4c42c145c04e9a5a15903ba3d9 Mon Sep 17 00:00:00 2001
From: Waiman Long 
Date: Tue, 7 Jul 2020 20:46:51 -0400
Subject: [PATCH 1/9] locking/pvqspinlock: Code relocation and extraction

Move pv_kick_node() and the unlock functions up and extract out the hash
and lock code from pv_wait_head_or_lock() into pv_hash_lock(). There
is no functional change.

Signed-off-by: Waiman Long 
---
 kernel/locking/qspinlock_paravirt.h | 302 ++--
 1 file changed, 156 insertions(+), 146 deletions(-)

diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h
index e84d21aa0722..8eec58320b85 100644
--- a/kernel/locking/qspinlock_paravirt.h
+++ b/kernel/locking/qspinlock_paravirt.h
@@ -55,6 +55,7 @@ struct pv_node {
 
 /*
  * Hybrid PV queued/unfair lock
+ * 
  *
  * By replacing the regular queued_spin_trylock() with the function below,
  * it will be called once when a lock waiter enter the PV slowpath before
@@ -259,6 +260,156 @@ static struct pv_node *pv_unhash(struct qspinlock *lock)
 	BUG();
 }
 
+/*
+ * Insert lock into hash and set _Q_SLOW_VAL.
+ * Return true if lock acquired.
+ */
+static inline bool pv_hash_lock(struct qspinlock *lock, struct pv_node *node)
+{
+	struct qspinlock **lp = pv_hash(lock, node);
+
+	/*
+	 * We must hash before setting _Q_SLOW_VAL, such that
+	 * when we observe _Q_SLOW_VAL in __pv_queued_spin_unlock()
+	 * we'll be sure to be able to observe our hash entry.
+	 *
+	 *   [S]  [Rmw] l->locked == _Q_SLOW_VAL
+	 *   MB   RMB
+	 * [RmW] l->locked = _Q_SLOW_VAL  [L] 
+	 *
+	 * Matches the smp_rmb() in __pv_queued_spin_unlock().
+	 */
+	if (xchg(&lock->locked, _Q_SLOW_VAL) == 0) {
+		/*
+		 * The lock was free and now we own the lock.
+		 * Change the lock value back to _Q_LOCKED_VAL
+		 * and unhash the table.
+		 */
+		WRITE_ONCE(lock->locked, _Q_LOCKED_VAL);
+		WRITE_ONCE(*lp, NULL);
+		return true;
+	}
+	return false;
+}
+
+/*
+ * Called after setting next->locked = 1 when we're the lock owner.
+ *
+ * Instead of waking the waiters stuck in pv_wait_node() advance their state
+ * such that they're waiting in pv_wait_head_or_lock(), this avoids a
+ * wake/sleep cycle.
+ */
+static void pv_kick_node(struct qspinlock *lock, struct mcs_spinlock *node)
+{
+	struct pv_node *pn = (struct pv_node *)node;
+
+	/*
+	 * If the vCPU is indeed halted, advance its state to match that of
+	 * pv_wait_node(). If OTOH this fails, the vCPU was running and will
+	 * observe its next->locked value and advance itself.
+	 *
+	 * Matches with smp_store_mb() and cmpxchg() in pv_wait_node()
+	 *
+	 * The write to next->locked in arch_mcs_spin_unlock_contended()
+	 * must be ordered before the read of pn->state in the cmpxchg()
+	 * below for the code to work correctly. To guarantee full ordering
+	 * irrespective of the success or failure of the cmpxchg(),
+	 * a relaxed version with explicit barrier is used. The control
+	 * dependency will order the reading of pn->state before any
+	 * subsequent writes.
+	 */
+	smp_mb__before_atomic();
+	if (cmpxchg_relaxed(&pn->state, vcpu_halted, vcpu_hashed)
+	!= vcpu_halted)
+		return;
+
+	/*
+	 * Put the lock into the hash table and set the _Q_SLOW_VAL.
+	 *
+	 * As this is the same vCPU that will check the _Q_SLOW_VAL value and
+	 * the hash table later on at unlock time, no atomic instruction is
+	 * needed.
+	 */
+	WRITE_ONCE(lock->locked, _Q_SLOW_VAL);
+	(void)pv_hash(lock, pn);
+}
+
+/*
+ * PV v

Re: [PATCH v2 2/4] powerpc/mm/radix: Free PUD table when freeing pagetable

[Aneesh Kumar K.V]

On 7/8/20 7:42 AM, Michael Ellerman wrote:

"Aneesh Kumar K.V"  writes:

From: Bharata B Rao 

remove_pagetable() isn't freeing PUD table. This causes memory
leak during memory unplug. Fix this.




Fixes: 4b5d62ca17a1 ("powerpc/mm: add radix__remove_section_mapping()")



Fixes: ??

cheers


Signed-off-by: Bharata B Rao 
Signed-off-by: Aneesh Kumar K.V 
---
  arch/powerpc/mm/book3s64/radix_pgtable.c | 16 
  1 file changed, 16 insertions(+)

diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c 
b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 80be96d3018f..af57604f295f 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -708,6 +708,21 @@ static void free_pmd_table(pmd_t *pmd_start, pud_t *pud)
pud_clear(pud);
  }
  
+static void free_pud_table(pud_t *pud_start, p4d_t *p4d)

+{
+   pud_t *pud;
+   int i;
+
+   for (i = 0; i < PTRS_PER_PUD; i++) {
+   pud = pud_start + i;
+   if (!pud_none(*pud))
+   return;
+   }
+
+   pud_free(&init_mm, pud_start);
+   p4d_clear(p4d);
+}
+
  struct change_mapping_params {
pte_t *pte;
unsigned long start;
@@ -882,6 +897,7 @@ static void __meminit remove_pagetable(unsigned long start, 
unsigned long end)
  
  		pud_base = (pud_t *)p4d_page_vaddr(*p4d);

remove_pud_table(pud_base, addr, next);
+   free_pud_table(pud_base, p4d);
}
  
  	spin_unlock(&init_mm.page_table_lock);

--
2.26.2

Re: [PATCH v2 04/10] powerpc/perf: Add power10_feat to dt_cpu_ftrs

[Athira Rajeev]

> On 07-Jul-2020, at 11:52 AM, Michael Neuling  wrote:
> 
> On Wed, 2020-07-01 at 05:20 -0400, Athira Rajeev wrote:
>> From: Madhavan Srinivasan 
>> 
>> Add power10 feature function to dt_cpu_ftrs.c along
>> with a power10 specific init() to initialize pmu sprs.
> 
> Can you say why you're doing this?
> 
> Can you add some text about what you're doing to the BHRB in this patch?

Sure, I will include these information for commit message in the next version

Thanks
Athira 

> 
> Mikey
> 
>> 
>> Signed-off-by: Madhavan Srinivasan 
>> ---
>> arch/powerpc/include/asm/reg.h|  3 +++
>> arch/powerpc/kernel/cpu_setup_power.S |  7 +++
>> arch/powerpc/kernel/dt_cpu_ftrs.c | 26 ++
>> 3 files changed, 36 insertions(+)
>> 
>> diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
>> index 21a1b2d..900ada1 100644
>> --- a/arch/powerpc/include/asm/reg.h
>> +++ b/arch/powerpc/include/asm/reg.h
>> @@ -1068,6 +1068,9 @@
>> #define MMCR0_PMC2_LOADMISSTIME  0x5
>> #endif
>> 
>> +/* BHRB disable bit for PowerISA v3.10 */
>> +#define MMCRA_BHRB_DISABLE  0x0020
>> +
>> /*
>>  * SPRG usage:
>>  *
>> diff --git a/arch/powerpc/kernel/cpu_setup_power.S
>> b/arch/powerpc/kernel/cpu_setup_power.S
>> index efdcfa7..e8b3370c 100644
>> --- a/arch/powerpc/kernel/cpu_setup_power.S
>> +++ b/arch/powerpc/kernel/cpu_setup_power.S
>> @@ -233,3 +233,10 @@ __init_PMU_ISA207:
>>  li  r5,0
>>  mtspr   SPRN_MMCRS,r5
>>  blr
>> +
>> +__init_PMU_ISA31:
>> +li  r5,0
>> +mtspr   SPRN_MMCR3,r5
>> +LOAD_REG_IMMEDIATE(r5, MMCRA_BHRB_DISABLE)
>> +mtspr   SPRN_MMCRA,r5
>> +blr
>> diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c
>> b/arch/powerpc/kernel/dt_cpu_ftrs.c
>> index a0edeb3..14a513f 100644
>> --- a/arch/powerpc/kernel/dt_cpu_ftrs.c
>> +++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
>> @@ -449,6 +449,31 @@ static int __init feat_enable_pmu_power9(struct
>> dt_cpu_feature *f)
>>  return 1;
>> }
>> 
>> +static void init_pmu_power10(void)
>> +{
>> +init_pmu_power9();
>> +
>> +mtspr(SPRN_MMCR3, 0);
>> +mtspr(SPRN_MMCRA, MMCRA_BHRB_DISABLE);
>> +}
>> +
>> +static int __init feat_enable_pmu_power10(struct dt_cpu_feature *f)
>> +{
>> +hfscr_pmu_enable();
>> +
>> +init_pmu_power10();
>> +init_pmu_registers = init_pmu_power10;
>> +
>> +cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
>> +cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
>> +
>> +cur_cpu_spec->num_pmcs  = 6;
>> +cur_cpu_spec->pmc_type  = PPC_PMC_IBM;
>> +cur_cpu_spec->oprofile_cpu_type = "ppc64/power10";
>> +
>> +return 1;
>> +}
>> +
>> static int __init feat_enable_tm(struct dt_cpu_feature *f)
>> {
>> #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
>> @@ -638,6 +663,7 @@ struct dt_cpu_feature_match {
>>  {"pc-relative-addressing", feat_enable, 0},
>>  {"machine-check-power9", feat_enable_mce_power9, 0},
>>  {"performance-monitor-power9", feat_enable_pmu_power9, 0},
>> +{"performance-monitor-power10", feat_enable_pmu_power10, 0},
>>  {"event-based-branch-v3", feat_enable, 0},
>>  {"random-number-generator", feat_enable, 0},
>>  {"system-call-vectored", feat_disable, 0},
> 

Re: [PATCH v2 2/4] powerpc/mm/radix: Free PUD table when freeing pagetable

[Michael Ellerman]

"Aneesh Kumar K.V"  writes:
> From: Bharata B Rao 
>
> remove_pagetable() isn't freeing PUD table. This causes memory
> leak during memory unplug. Fix this.

Fixes: ??

cheers

> Signed-off-by: Bharata B Rao 
> Signed-off-by: Aneesh Kumar K.V 
> ---
>  arch/powerpc/mm/book3s64/radix_pgtable.c | 16 
>  1 file changed, 16 insertions(+)
>
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c 
> b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index 80be96d3018f..af57604f295f 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -708,6 +708,21 @@ static void free_pmd_table(pmd_t *pmd_start, pud_t *pud)
>   pud_clear(pud);
>  }
>  
> +static void free_pud_table(pud_t *pud_start, p4d_t *p4d)
> +{
> + pud_t *pud;
> + int i;
> +
> + for (i = 0; i < PTRS_PER_PUD; i++) {
> + pud = pud_start + i;
> + if (!pud_none(*pud))
> + return;
> + }
> +
> + pud_free(&init_mm, pud_start);
> + p4d_clear(p4d);
> +}
> +
>  struct change_mapping_params {
>   pte_t *pte;
>   unsigned long start;
> @@ -882,6 +897,7 @@ static void __meminit remove_pagetable(unsigned long 
> start, unsigned long end)
>  
>   pud_base = (pud_t *)p4d_page_vaddr(*p4d);
>   remove_pud_table(pud_base, addr, next);
> + free_pud_table(pud_base, p4d);
>   }
>  
>   spin_unlock(&init_mm.page_table_lock);
> -- 
> 2.26.2

Re: [PATCH v2 10/10] powerpc/perf: Add extended regs support for power10 platform

[Athira Rajeev]

> On 02-Jul-2020, at 3:10 PM, kernel test robot  wrote:
> 
> Hi Athira,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on powerpc/next]
> [also build test ERROR on tip/perf/core v5.8-rc3 next-20200702]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use  as documented in
> https://git-scm.com/docs/git-format-patch]
> 
> url:
> https://github.com/0day-ci/linux/commits/Athira-Rajeev/powerpc-perf-Add-support-for-power10-PMU-Hardware/20200701-181147
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
> config: powerpc-pmac32_defconfig (attached as .config)
> compiler: powerpc-linux-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
>wget 
> https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O 
> ~/bin/make.cross
>chmod +x ~/bin/make.cross
># save the attached .config to linux build tree
>COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross 
> ARCH=powerpc 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot 
> 
> All errors (new ones prefixed by >>):
> 
>   {standard input}: Assembler messages:
>>> {standard input}:84: Error: unsupported relocation against SPRN_SIER2
>>> {standard input}:91: Error: unsupported relocation against SPRN_SIER3
>>> {standard input}:119: Error: unsupported relocation against SPRN_MMCR3

These regs are not valid for ppc32 platform. Will fix this by including usage 
of these regs under conditional check for
“CONFIG_PPC64” in next version

Thanks
Athira Rajeev
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
> <.config.gz>

Re: Failure to build librseq on ppc

[Segher Boessenkool]

Hi!

On Tue, Jul 07, 2020 at 03:17:10PM -0400, Mathieu Desnoyers wrote:
> I'm trying to build librseq at:
> 
> https://git.kernel.org/pub/scm/libs/librseq/librseq.git
> 
> on powerpc, and I get these errors when building the rseq basic
> test mirrored from the kernel selftests code:
> 
> /tmp/ccieEWxU.s: Assembler messages:
> /tmp/ccieEWxU.s:118: Error: syntax error; found `,', expected `('
> /tmp/ccieEWxU.s:118: Error: junk at end of line: `,8'
> /tmp/ccieEWxU.s:121: Error: syntax error; found `,', expected `('
> /tmp/ccieEWxU.s:121: Error: junk at end of line: `,8'
> /tmp/ccieEWxU.s:626: Error: syntax error; found `,', expected `('
> /tmp/ccieEWxU.s:626: Error: junk at end of line: `,8'
> /tmp/ccieEWxU.s:629: Error: syntax error; found `,', expected `('
> /tmp/ccieEWxU.s:629: Error: junk at end of line: `,8'
> /tmp/ccieEWxU.s:735: Error: syntax error; found `,', expected `('
> /tmp/ccieEWxU.s:735: Error: junk at end of line: `,8'
> /tmp/ccieEWxU.s:738: Error: syntax error; found `,', expected `('
> /tmp/ccieEWxU.s:738: Error: junk at end of line: `,8'
> /tmp/ccieEWxU.s:741: Error: syntax error; found `,', expected `('
> /tmp/ccieEWxU.s:741: Error: junk at end of line: `,8'
> Makefile:581: recipe for target 'basic_percpu_ops_test.o' failed

You'll have to show the actual failing machine code, and with enough
context that we can relate this to the source code.

-save-temps helps, or use -S instead of -c, etc.

> I am using this compiler:
> 
> gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
> Target: powerpc-linux-gnu
> 
> So far, I got things to build by changing "m" operands to "Q" operands.
> Based on 
> https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html#Machine-Constraints
> it seems that "Q" means "A memory operand addressed by just a base register."

Yup.

> I suspect that lwz and stw don't expect some kind of immediate offset which
> can be kept with "m", and "Q" fixes this. Is that the right fix ?
> 
> And should we change all operands passed to lwz and stw to a "Q" operand ?

No, lwz and stw exactly *do* take an immediate offset.

It sounds like the compiler passed memory addressed by indexed
addressing, instead.  Which is fine for "m", and also fine for those
insns... well, you need lwzx and stwx.

So perhaps you have code like

  int *p;
  int x;
  ...
  asm ("lwz %0,%1" : "=r"(x) : "m"(*p));

where that last line should actually read

  asm ("lwz%X1 %0,%1" : "=r"(x) : "m"(*p));

?


Segher

[PATCH 2/2] PCI/AER: Log correctable errors as warning, not error

[Bjorn Helgaas]

From: Matt Jolly 

PCIe correctable errors are recovered by hardware with no need for software
intervention (PCIe r5.0, sec 6.2.2.1).

Reduce the log level of correctable errors from KERN_ERR to KERN_WARNING.

The bug reports below are for correctable error logging.  This doesn't fix
the cause of those reports, but it may make the messages less alarming.

[bhelgaas: commit log, use pci_printk() to avoid code duplication]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201517
Link: https://bugzilla.kernel.org/show_bug.cgi?id=196183
Link: https://lore.kernel.org/r/20200618155511.16009-1-Kangie@footclan.ninja
Signed-off-by: Matt Jolly 
Signed-off-by: Bjorn Helgaas 
---
 drivers/pci/pcie/aer.c | 25 +++--
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 9176c8a968b9..ca886bf91fd9 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -673,20 +673,23 @@ static void __aer_print_error(struct pci_dev *dev,
 {
const char **strings;
unsigned long status = info->status & ~info->mask;
-   const char *errmsg;
+   const char *level, *errmsg;
int i;
 
-   if (info->severity == AER_CORRECTABLE)
+   if (info->severity == AER_CORRECTABLE) {
strings = aer_correctable_error_string;
-   else
+   level = KERN_WARNING;
+   } else {
strings = aer_uncorrectable_error_string;
+   level = KERN_ERR;
+   }
 
for_each_set_bit(i, &status, 32) {
errmsg = strings[i];
if (!errmsg)
errmsg = "Unknown Error Bit";
 
-   pci_err(dev, "   [%2d] %-22s%s\n", i, errmsg,
+   pci_printk(level, dev, "   [%2d] %-22s%s\n", i, errmsg,
info->first_error == i ? " (First)" : "");
}
pci_dev_aer_stats_incr(dev, info);
@@ -696,6 +699,7 @@ void aer_print_error(struct pci_dev *dev, struct 
aer_err_info *info)
 {
int layer, agent;
int id = ((dev->bus->number << 8) | dev->devfn);
+   const char *level;
 
if (!info->status) {
pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, 
(Unregistered Agent ID)\n",
@@ -706,13 +710,14 @@ void aer_print_error(struct pci_dev *dev, struct 
aer_err_info *info)
layer = AER_GET_LAYER_ERROR(info->severity, info->status);
agent = AER_GET_AGENT(info->severity, info->status);
 
-   pci_err(dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
-   aer_error_severity_string[info->severity],
-   aer_error_layer[layer], aer_agent_string[agent]);
+   level = (info->severity == AER_CORRECTABLE) ? KERN_WARNING : KERN_ERR;
+
+   pci_printk(level, dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
+  aer_error_severity_string[info->severity],
+  aer_error_layer[layer], aer_agent_string[agent]);
 
-   pci_err(dev, "  device [%04x:%04x] error status/mask=%08x/%08x\n",
-   dev->vendor, dev->device,
-   info->status, info->mask);
+   pci_printk(level, dev, "  device [%04x:%04x] error 
status/mask=%08x/%08x\n",
+  dev->vendor, dev->device, info->status, info->mask);
 
__aer_print_error(dev, info);
 
-- 
2.25.1

[PATCH 1/2] PCI/AER: Simplify __aer_print_error()

[Bjorn Helgaas]

From: Bjorn Helgaas 

aer_correctable_error_string[] and aer_uncorrectable_error_string[] have
descriptions of AER error status bits.  Add NULL entries to these tables so
all entries for bits 0-31 are defined.  Then we don't have to check for
ARRAY_SIZE() when decoding a status word, which simplifies
__aer_print_error().

Signed-off-by: Bjorn Helgaas 
---
 drivers/pci/pcie/aer.c | 48 ++
 1 file changed, 34 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 3acf56683915..9176c8a968b9 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -447,7 +447,7 @@ static const char *aer_error_layer[] = {
"Transaction Layer"
 };
 
-static const char *aer_correctable_error_string[AER_MAX_TYPEOF_COR_ERRS] = {
+static const char *aer_correctable_error_string[] = {
"RxErr",/* Bit Position 0   */
NULL,
NULL,
@@ -464,9 +464,25 @@ static const char 
*aer_correctable_error_string[AER_MAX_TYPEOF_COR_ERRS] = {
"NonFatalErr",  /* Bit Position 13  */
"CorrIntErr",   /* Bit Position 14  */
"HeaderOF", /* Bit Position 15  */
+   NULL,   /* Bit Position 16  */
+   NULL,   /* Bit Position 17  */
+   NULL,   /* Bit Position 18  */
+   NULL,   /* Bit Position 19  */
+   NULL,   /* Bit Position 20  */
+   NULL,   /* Bit Position 21  */
+   NULL,   /* Bit Position 22  */
+   NULL,   /* Bit Position 23  */
+   NULL,   /* Bit Position 24  */
+   NULL,   /* Bit Position 25  */
+   NULL,   /* Bit Position 26  */
+   NULL,   /* Bit Position 27  */
+   NULL,   /* Bit Position 28  */
+   NULL,   /* Bit Position 29  */
+   NULL,   /* Bit Position 30  */
+   NULL,   /* Bit Position 31  */
 };
 
-static const char *aer_uncorrectable_error_string[AER_MAX_TYPEOF_UNCOR_ERRS] = 
{
+static const char *aer_uncorrectable_error_string[] = {
"Undefined",/* Bit Position 0   */
NULL,
NULL,
@@ -494,6 +510,11 @@ static const char 
*aer_uncorrectable_error_string[AER_MAX_TYPEOF_UNCOR_ERRS] = {
"AtomicOpBlocked",  /* Bit Position 24  */
"TLPBlockedErr",/* Bit Position 25  */
"PoisonTLPBlocked", /* Bit Position 26  */
+   NULL,   /* Bit Position 27  */
+   NULL,   /* Bit Position 28  */
+   NULL,   /* Bit Position 29  */
+   NULL,   /* Bit Position 30  */
+   NULL,   /* Bit Position 31  */
 };
 
 static const char *aer_agent_string[] = {
@@ -650,24 +671,23 @@ static void __print_tlp_header(struct pci_dev *dev,
 static void __aer_print_error(struct pci_dev *dev,
  struct aer_err_info *info)
 {
+   const char **strings;
unsigned long status = info->status & ~info->mask;
-   const char *errmsg = NULL;
+   const char *errmsg;
int i;
 
+   if (info->severity == AER_CORRECTABLE)
+   strings = aer_correctable_error_string;
+   else
+   strings = aer_uncorrectable_error_string;
+
for_each_set_bit(i, &status, 32) {
-   if (info->severity == AER_CORRECTABLE)
-   errmsg = i < ARRAY_SIZE(aer_correctable_error_string) ?
-   aer_correctable_error_string[i] : NULL;
-   else
-   errmsg = i < ARRAY_SIZE(aer_uncorrectable_error_string) 
?
-   aer_uncorrectable_error_string[i] : NULL;
+   errmsg = strings[i];
+   if (!errmsg)
+   errmsg = "Unknown Error Bit";
 
-   if (errmsg)
-   pci_err(dev, "   [%2d] %-22s%s\n", i, errmsg,
+   pci_err(dev, "   [%2d] %-22s%s\n", i, errmsg,
info->first_error == i ? " (First)" : "");
-   else
-   pci_err(dev, "   [%2d] Unknown Error Bit%s\n",
-   i, info->first_error == i ? " (First)" : "");
}
pci_dev_aer_stats_incr(dev, info);
 }
-- 
2.25.1

Re: [PATCH] pci: pcie: AER: Fix logging of Correctable errors

[Bjorn Helgaas]

On Fri, Jun 19, 2020 at 01:55:11AM +1000, Matt Jolly wrote:
> The AER documentation indicates that correctable (severity=Corrected)
> errors should be output as a warning so that users can filter these
> errors if they choose to; This functionality does not appear to have been 
> implemented.
> 
> This patch modifies the functions aer_print_error and __aer_print_error
> to send correctable errors as a warning (pci_warn), rather than as an error 
> (pci_err). It
> partially addresses several bugs in relation to kernel message buffer
> spam for misbehaving devices - the root cause (possibly device firmware?) 
> isn't
> addressed, but the dmesg output is less alarming for end users, and can
> be filtered separately from uncorrectable errors. This should hopefully
> reduce the need for users to disable AER to suppress corrected errors.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=201517
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=196183
> 
> Signed-off-by: Matt Jolly 
> ---
>  drivers/pci/pcie/aer.c | 36 ++--
>  1 file changed, 26 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 3acf56683915..131ecc0df2cb 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -662,12 +662,18 @@ static void __aer_print_error(struct pci_dev *dev,
>   errmsg = i < ARRAY_SIZE(aer_uncorrectable_error_string) 
> ?
>   aer_uncorrectable_error_string[i] : NULL;
>  
> - if (errmsg)
> - pci_err(dev, "   [%2d] %-22s%s\n", i, errmsg,
> - info->first_error == i ? " (First)" : "");
> - else
> + if (errmsg) {
> + if (info->severity == AER_CORRECTABLE) {
> + pci_warn(dev, "   [%2d] %-22s%s\n", i, errmsg,

I think we can use pci_printk() here to reduce the code duplication.

And I think we can also simplify the aer_correctable_error_string/
aer_uncorrectable_error_string stuff above, which would make this even
simpler.

I'll respond to this with my proposal.

> + info->first_error == i ? " (First)" : 
> "");
> + } else {
> + pci_err(dev, "   [%2d] %-22s%s\n", i, errmsg,
> + info->first_error == i ? " (First)" : 
> "");
> + }
> + } else {
>   pci_err(dev, "   [%2d] Unknown Error Bit%s\n",
>   i, info->first_error == i ? " (First)" : "");
> + }
>   }
>   pci_dev_aer_stats_incr(dev, info);
>  }
> @@ -686,13 +692,23 @@ void aer_print_error(struct pci_dev *dev, struct 
> aer_err_info *info)
>   layer = AER_GET_LAYER_ERROR(info->severity, info->status);
>   agent = AER_GET_AGENT(info->severity, info->status);
>  
> - pci_err(dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
> - aer_error_severity_string[info->severity],
> - aer_error_layer[layer], aer_agent_string[agent]);
> + if  (info->severity == AER_CORRECTABLE) {
> + pci_warn(dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
> + aer_error_severity_string[info->severity],
> + aer_error_layer[layer], aer_agent_string[agent]);
>  
> - pci_err(dev, "  device [%04x:%04x] error status/mask=%08x/%08x\n",
> - dev->vendor, dev->device,
> - info->status, info->mask);
> + pci_warn(dev, "  device [%04x:%04x] error 
> status/mask=%08x/%08x\n",
> + dev->vendor, dev->device,
> + info->status, info->mask);
> + } else {
> + pci_err(dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
> + aer_error_severity_string[info->severity],
> + aer_error_layer[layer], aer_agent_string[agent]);
> +
> + pci_err(dev, "  device [%04x:%04x] error 
> status/mask=%08x/%08x\n",
> + dev->vendor, dev->device,
> + info->status, info->mask);
> + }
>  
>   __aer_print_error(dev, info);
>  
> -- 
> 2.26.2
> 

Re: [PATCH 13/20] Documentation: mips/ingenic-tcu: eliminate duplicated word

[Paul Cercueil]

Hi,

Le mar. 7 juil. 2020 à 11:04, Randy Dunlap  a 
écrit :

Drop the doubled word "to".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Paul Cercueil 
Cc: Thomas Bogendoerfer 
Cc: linux-m...@vger.kernel.org


Reviewed-by: Paul Cercueil 

Cheers,
-Paul


---
 Documentation/mips/ingenic-tcu.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/mips/ingenic-tcu.rst
+++ linux-next-20200701/Documentation/mips/ingenic-tcu.rst
@@ -5,7 +5,7 @@ Ingenic JZ47xx SoCs Timer/Counter Unit h
 ===

 The Timer/Counter Unit (TCU) in Ingenic JZ47xx SoCs is a 
multi-function
-hardware block. It features up to to eight channels, that can be 
used as

+hardware block. It features up to eight channels, that can be used as
 counters, timers, or PWM.

 - JZ4725B, JZ4750, JZ4755 only have six TCU channels. The other SoCs 
all

Re: FSL P5020/P5040: DPAA Ethernet issue with the latest Git kernel

[Christian Zigotzky]

> On 7. Jul 2020, at 17:53, Madalin Bucur (OSS)  
> wrote:
> 
> Was DPAA functional before commit A?
> How about after commit A and before commit B?

The DPAA Ethernet works from  the kernel 5.6-rc4 [1] till the Git kernel from 
the 11 of June [2]. It doesn’t work since the commit “fix bitmap_parse” [3].

[1] https://forum.hyperion-entertainment.com/viewtopic.php?p=49936#p49936
[2] https://forum.hyperion-entertainment.com/viewtopic.php?p=50848#p50848
[3] https://forum.hyperion-entertainment.com/viewtopic.php?p=50980#p50980

[PATCH 20/20] Documentation: vm/memory-model: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Andrew Morton 
Cc: linux...@kvack.org
---
 Documentation/vm/memory-model.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/vm/memory-model.rst
+++ linux-next-20200701/Documentation/vm/memory-model.rst
@@ -159,7 +159,7 @@ frame. Inside a section, the PFN is the
 The sparse vmemmap uses a virtually mapped memory map to optimize
 pfn_to_page and page_to_pfn operations. There is a global `struct
 page *vmemmap` pointer that points to a virtually contiguous array of
-`struct page` objects. A PFN is an index to that array and the the
+`struct page` objects. A PFN is an index to that array and the
 offset of the `struct page` from `vmemmap` is the PFN of that
 page.
 

[PATCH 13/13] PCI: Remove '*val = 0' from pcie_capability_read_*()

[Saheed Olayemi Bolarinwa]

From: Bolarinwa Olayemi Saheed 

There are several reasons why a PCI capability read may fail whether the
device is present or not. If this happens, pcie_capability_read_*() will
return -EINVAL/PCIBIOS_BAD_REGISTER_NUMBER or PCIBIOS_DEVICE_NOT_FOUND
and *val is set to 0.

This behaviour if further ensured by this code inside
pcie_capability_read_*()

 ret = pci_read_config_dword(dev, pci_pcie_cap(dev) + pos, val);
 /*
  * Reset *val to 0 if pci_read_config_dword() fails, it may
  * have been written as 0x if hardware error happens
  * during pci_read_config_dword().
  */
 if (ret)
 *val = 0;
 return ret;

a) Since all pci_generic_config_read() does is read a register value,
it may return success after reading a ~0 which *may* have been fabricated
by the PCI host bridge due to a read timeout. Hence pci_read_config_*() 
will return success with a fabricated ~0 in *val, indicating a problem.
In this case, the assumed behaviour of  pcie_capability_read_*() will be
wrong. To avoid error slipping through, more checks are necessary.

b) pci_read_config_*() will return PCIBIOS_DEVICE_NOT_FOUND only if 
dev->error_state = pci_channel_io_perm_failure (i.e. 
pci_dev_is_disconnected()) or if pci_generic_config_read() can't find the
device. In both cases *val is initially set to ~0 but as shown in the code
above pcie_capability_read_*() resets it back to 0. Even with this effort,
drivers still have to perform validation checks more so if 0 is a valid
value.

Most drivers only consider the case (b) and in some cases, there is the 
expectation that on timeout *val has a fabricated value of ~0, which *may*
not always be true as explained in (a).

In any case, checks need to be done to validate the value read and maybe
confirm which error has occurred. It is better left to the drivers to do.

Remove the reset of *val to 0 when pci_read_config_*() fails.

Suggested-by: Bjorn Helgaas 
Signed-off-by: Bolarinwa Olayemi Saheed 
---
This patch  depends on all of the preceeding patches in this series,
otherwise it will introduce bugs as pointed out in the commit message
of each.
 drivers/pci/access.c | 14 --
 1 file changed, 14 deletions(-)

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 79c4a2ef269a..ec95edbb1ac8 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -413,13 +413,6 @@ int pcie_capability_read_word(struct pci_dev *dev, int 
pos, u16 *val)
 
if (pcie_capability_reg_implemented(dev, pos)) {
ret = pci_read_config_word(dev, pci_pcie_cap(dev) + pos, val);
-   /*
-* Reset *val to 0 if pci_read_config_word() fails, it may
-* have been written as 0x if hardware error happens
-* during pci_read_config_word().
-*/
-   if (ret)
-   *val = 0;
return ret;
}
 
@@ -448,13 +441,6 @@ int pcie_capability_read_dword(struct pci_dev *dev, int 
pos, u32 *val)
 
if (pcie_capability_reg_implemented(dev, pos)) {
ret = pci_read_config_dword(dev, pci_pcie_cap(dev) + pos, val);
-   /*
-* Reset *val to 0 if pci_read_config_dword() fails, it may
-* have been written as 0x if hardware error happens
-* during pci_read_config_dword().
-*/
-   if (ret)
-   *val = 0;
return ret;
}
 
-- 
2.18.2

[PATCH 0/13] PCI: Remove '*val = 0' from pcie_capability_read_*()

[Saheed Olayemi Bolarinwa]

From: Bolarinwa Olayemi Saheed 

MERGING:
Only Patch 13/13 depend on all preceeding patchs. All other patches are
independent of one another. Hence, please merge PATCH 13/13 only after
other patches in this series have been merged.

PATCH 6/13:
Make the function set status to "Power On" by default and only set to
Set "Power Off" only if pcie_capability_read_word() is successful and
(slot_ctrl & PCI_EXP_SLTCTL_PCC) == PCI_EXP_SLTCTL_PWR_OFF. 

PATCH 1/13 to 12/13:
Check the return value of pcie_capability_read_*() to ensure success or
confirm failure. While maintaining these functions, this ensures that the
changes in PATCH 13/13 does not introduce any bug. 

PATCH 13/13:
There are several reasons why a PCI capability read may fail whether the
device is present or not. If this happens, pcie_capability_read_*() will
return -EINVAL/PCIBIOS_BAD_REGISTER_NUMBER or PCIBIOS_DEVICE_NOT_FOUND
and *val is set to 0.

This behaviour if further ensured by this code inside
pcie_capability_read_*()

 ret = pci_read_config_dword(dev, pci_pcie_cap(dev) + pos, val);
 /*
  * Reset *val to 0 if pci_read_config_dword() fails, it may
  * have been written as 0x if hardware error happens
  * during pci_read_config_dword().
  */
 if (ret)
 *val = 0;
 return ret;

a) Since all pci_generic_config_read() does is read a register value,
it may return success after reading a ~0 which *may* have been fabricated
by the PCI host bridge due to a read timeout. Hence pci_read_config_*() 
will return success with a fabricated ~0 in *val, indicating a problem.
In this case, the assumed behaviour of  pcie_capability_read_*() will be
wrong. To avoid error slipping through, more checks are necessary.

b) pci_read_config_*() will return PCIBIOS_DEVICE_NOT_FOUND only if 
dev->error_state = pci_channel_io_perm_failure (i.e. 
pci_dev_is_disconnected()) or if pci_generic_config_read() can't find the
device. In both cases *val is initially set to ~0 but as shown in the code
above pcie_capability_read_*() resets it back to 0. Even with this effort,
drivers still have to perform validation checks more so if 0 is a valid
value.

Most drivers only consider the case (b) and in some cases, there is the 
expectation that on timeout *val has a fabricated value of ~0, which *may*
not always be true as explained in (a).

In any case, checks need to be done to validate the value read and maybe
confirm which error has occurred. It is better left to the drivers to do.

Check the return value of pcie_capability_read_dword() to ensure success
and avoid bug as a result of Patch 13/13.
Remove the reset of *val to 0 when pci_read_config_*() fails.


Bolarinwa Olayemi Saheed (13):
  IB/hfi1: Check the return value of pcie_capability_read_*()
  misc: rtsx: Check the return value of pcie_capability_read_*()
  ath9k: Check the return value of pcie_capability_read_*()
  iwlegacy: Check the return value of pcie_capability_read_*()
  PCI: pciehp: Check the return value of pcie_capability_read_*()
  PCI: pciehp: Make "Power On" the default 
  PCI/ACPI: Check the return value of pcie_capability_read_*()
  PCI: pciehp: Check the return value of pcie_capability_read_*()
  PCI: Check the return value of pcie_capability_read_*()
  PCI/PM: Check return value of pcie_capability_read_*()
  PCI/AER: Check the return value of pcie_capability_read_*()
  PCI/ASPM: Check the return value of pcie_capability_read_*()
  PCI: Remove '*val = 0' from pcie_capability_read_*()

 drivers/net/wireless/ath/ath9k/pci.c | 5 +++--
 drivers/net/wireless/intel/iwlegacy/common.c | 4 ++--
 drivers/infiniband/hw/hfi1/aspm.c | 7 ---
 drivers/misc/cardreader/rts5227.c | 5 +++--
 drivers/misc/cardreader/rts5249.c | 5 +++--
 drivers/misc/cardreader/rts5260.c | 5 +++--
 drivers/misc/cardreader/rts5261.c | 5 +++--
 drivers/pci/pcie/aer.c  |  5 +++--
 drivers/pci/pcie/aspm.c | 33 +
 drivers/pci/hotplug/pciehp_hpc.c | 47 
 drivers/pci/pci-acpi.c   | 10 ---
 drivers/pci/probe.c  | 29 
 drivers/pci/access.c | 14 --
 13 files changed, 87 insertions(+), 87 deletions(-)

-- 
2.18.2

[PATCH v5 16/25] mm/powerpc: Use general page fault accounting

[Peter Xu]

Use the general page fault accounting by passing regs into handle_mm_fault().

CC: Michael Ellerman 
CC: Benjamin Herrenschmidt 
CC: Paul Mackerras 
CC: linuxppc-dev@lists.ozlabs.org
Acked-by: Michael Ellerman 
Signed-off-by: Peter Xu 
---
 arch/powerpc/mm/fault.c | 11 +++
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 25dee001d8e1..00259e9b452d 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -607,7 +607,7 @@ static int __do_page_fault(struct pt_regs *regs, unsigned 
long address,
 * make sure we exit gracefully rather than endlessly redo
 * the fault.
 */
-   fault = handle_mm_fault(vma, address, flags, NULL);
+   fault = handle_mm_fault(vma, address, flags, regs);
 
major |= fault & VM_FAULT_MAJOR;
 
@@ -633,14 +633,9 @@ static int __do_page_fault(struct pt_regs *regs, unsigned 
long address,
/*
 * Major/minor page fault accounting.
 */
-   if (major) {
-   current->maj_flt++;
-   perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
+   if (major)
cmo_account_page_fault();
-   } else {
-   current->min_flt++;
-   perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
-   }
+
return 0;
 }
 NOKPROBE_SYMBOL(__do_page_fault);
-- 
2.26.2

Re: [PATCH v2 1/2] kbuild: introduce ccflags-remove-y and asflags-remove-y

[Anders Roxell]

On Tue, 7 Jul 2020 at 11:21, Masahiro Yamada  wrote:
>
> CFLAGS_REMOVE_.o filters out flags when compiling a particular
> object, but there is no convenient way to do that for every object in
> a directory.
>
> Add ccflags-remove-y and asflags-remove-y to make it easily.
>
> Use ccflags-remove-y to clean up some Makefiles.
>
> The add/remove order works as follows:
>
>  [1] KBUILD_CFLAGS specifies compiler flags used globally
>
>  [2] ccflags-y adds compiler flags for all objects in the
>  current Makefile
>
>  [3] ccflags-remove-y removes compiler flags for all objects in the
>  current Makefile (New feature)
>
>  [4] CFLAGS_ adds compiler flags per file.
>
>  [5] CFLAGS_REMOVE_ removes compiler flags per file.
>
> Having [3] before [4] allows us to remove flags from most (but not all)
> objects in the current Makefile.
>
> For example, kernel/trace/Makefile removes $(CC_FLAGS_FTRACE)
> from all objects in the directory, then adds it back to
> trace_selftest_dynamic.o and CFLAGS_trace_kprobe_selftest.o
>
> Please note ccflags-remove-y has no effect to the sub-directories.
> In contrast, the previous notation got rid of compiler flags also from
> all the sub-directories.
>
>   arch/arm/boot/compressed/
>   arch/powerpc/xmon/
>   arch/sh/
>   kernel/trace/
>
> ... have no sub-directories.
>
>   lib/
>
> ... has several sub-directories.
>
> To keep the behavior, I added ccflags-remove-y to all Makefiles
> in subdirectories of lib/, except:
>
>   lib/vdso/Makefile- Kbuild does not descend into this Makefile
>   lib/raid/test/Makefile   - This is not used for the kernel build
>
> I think commit 2464a609ded0 ("ftrace: do not trace library functions")
> excluded too much. In later commit, I will try to remove ccflags-remove-y
> from sub-directory Makefiles.
>
> Suggested-by: Sami Tolvanen 
> Signed-off-by: Masahiro Yamada 
> Acked-by: Steven Rostedt (VMware) 
> Acked-by: Michael Ellerman  (powerpc)

Tested-by: Anders Roxell 

> ---
>
> Changes in v2:
>   - Swap the order of [3] and [4] to keep the current behavior of
> kernel/trace/Makefile.
>   - Add ccflags-remove-y to subdir Makefiles of lib/
>
>  Documentation/kbuild/makefiles.rst | 14 ++
>  arch/arm/boot/compressed/Makefile  |  6 +-
>  arch/powerpc/xmon/Makefile |  3 +--
>  arch/sh/boot/compressed/Makefile   |  5 +
>  kernel/trace/Makefile  |  4 ++--
>  lib/842/Makefile   |  3 +++
>  lib/Makefile   |  5 +
>  lib/crypto/Makefile|  2 ++
>  lib/dim/Makefile   |  2 ++
>  lib/fonts/Makefile |  2 ++
>  lib/kunit/Makefile |  3 +++
>  lib/livepatch/Makefile |  2 ++
>  lib/lz4/Makefile   |  1 +
>  lib/lzo/Makefile   |  2 ++
>  lib/math/Makefile  |  2 ++
>  lib/mpi/Makefile   |  2 ++
>  lib/raid6/Makefile |  3 +++
>  lib/reed_solomon/Makefile  |  2 ++
>  lib/xz/Makefile|  3 +++
>  lib/zlib_deflate/Makefile  |  2 ++
>  lib/zlib_dfltcc/Makefile   |  2 ++
>  lib/zlib_inflate/Makefile  |  2 ++
>  lib/zstd/Makefile  |  1 +
>  scripts/Makefile.lib   | 14 --
>  24 files changed, 64 insertions(+), 23 deletions(-)
>
> diff --git a/Documentation/kbuild/makefiles.rst 
> b/Documentation/kbuild/makefiles.rst
> index 6515ebc12b6f..14d8e7d23c04 100644
> --- a/Documentation/kbuild/makefiles.rst
> +++ b/Documentation/kbuild/makefiles.rst
> @@ -368,6 +368,14 @@ more details, with real examples.
>
> subdir-ccflags-y := -Werror
>
> +ccflags-remove-y, asflags-remove-y
> +   These flags are used to remove particular flags for the compiler,
> +   assembler invocations.
> +
> +   Example::
> +
> +   ccflags-remove-$(CONFIG_MCOUNT) += -pg
> +
>  CFLAGS_$@, AFLAGS_$@
> CFLAGS_$@ and AFLAGS_$@ only apply to commands in current
> kbuild makefile.
> @@ -375,6 +383,9 @@ more details, with real examples.
> $(CFLAGS_$@) specifies per-file options for $(CC).  The $@
> part has a literal value which specifies the file that it is for.
>
> +   CFLAGS_$@ has the higher priority than ccflags-remove-y; CFLAGS_$@
> +   can re-add compiler flags that were removed by ccflags-remove-y.
> +
> Example::
>
> # drivers/scsi/Makefile
> @@ -387,6 +398,9 @@ more details, with real examples.
> $(AFLAGS_$@) is a similar feature for source files in assembly
> languages.
>
> +   AFLAGS_$@ has the higher priority than asflags-remove-y; AFLAGS_$@
> +   can re-add assembler flags that were removed by asflags-remove-y.
> +
> Example::
>
> # arch/arm/kernel/Makefile
> diff --git a/arch/arm/boot/compressed/Makefile 
> b/arch/arm/boot/compressed/Makefile
> index 00602a6fba04..3d5691b23951 100644
> --- a/arch/arm/boot/compressed/

Re: [PATCH 20/20] Documentation: vm/memory-model: eliminate duplicated word

[Mike Rapoport]

On Tue, Jul 07, 2020 at 11:04:13AM -0700, Randy Dunlap wrote:
> Drop the doubled word "the".
> 
> Signed-off-by: Randy Dunlap 
> Cc: Jonathan Corbet 
> Cc: linux-...@vger.kernel.org
> Cc: Andrew Morton 
> Cc: linux...@kvack.org

Reviewed-by: Mike Rapoport 

> ---
>  Documentation/vm/memory-model.rst |2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- linux-next-20200701.orig/Documentation/vm/memory-model.rst
> +++ linux-next-20200701/Documentation/vm/memory-model.rst
> @@ -159,7 +159,7 @@ frame. Inside a section, the PFN is the
>  The sparse vmemmap uses a virtually mapped memory map to optimize
>  pfn_to_page and page_to_pfn operations. There is a global `struct
>  page *vmemmap` pointer that points to a virtually contiguous array of
> -`struct page` objects. A PFN is an index to that array and the the
> +`struct page` objects. A PFN is an index to that array and the
>  offset of the `struct page` from `vmemmap` is the PFN of that
>  page.
>  

-- 
Sincerely yours,
Mike.

Failure to build librseq on ppc

[Mathieu Desnoyers]

Hi Boqun,

I'm trying to build librseq at:

https://git.kernel.org/pub/scm/libs/librseq/librseq.git

on powerpc, and I get these errors when building the rseq basic
test mirrored from the kernel selftests code:

/tmp/ccieEWxU.s: Assembler messages:
/tmp/ccieEWxU.s:118: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:118: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:121: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:121: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:626: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:626: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:629: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:629: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:735: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:735: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:738: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:738: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:741: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:741: Error: junk at end of line: `,8'
Makefile:581: recipe for target 'basic_percpu_ops_test.o' failed

I am using this compiler:

gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
Target: powerpc-linux-gnu

So far, I got things to build by changing "m" operands to "Q" operands.
Based on 
https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html#Machine-Constraints
it seems that "Q" means "A memory operand addressed by just a base register."
I suspect that lwz and stw don't expect some kind of immediate offset which
can be kept with "m", and "Q" fixes this. Is that the right fix ?

And should we change all operands passed to lwz and stw to a "Q" operand ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

Re: [PATCH 10/10] dt-bindings: mtd: fsl-upm-nand: Deprecate chip-delay and fsl, upm-wait-flags

[Miquel Raynal]

On Wed, 2020-06-03 at 13:49:22 UTC, Boris Brezillon wrote:
> Those properties are no longer parsed by the driver which is being passed
> those information by the core now. Let's deprecate them.
> 
> Signed-off-by: Boris Brezillon 

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git 
nand/next, thanks.

Miquel

Re: [PATCH v2] powerpc/uaccess: Use flexible addressing with __put_user()/__get_user()

[Christophe Leroy]

Le 07/07/2020 à 14:44, Christophe Leroy a écrit :



Le 30/06/2020 à 03:19, Michael Ellerman a écrit :

Michael Ellerman  writes:

Christophe Leroy  writes:

Hi Michael,

I see this patch is marked as "defered" in patchwork, but I can't see
any related discussion. Is it normal ?


Because it uses the "m<>" constraint which didn't work on GCC 4.6.

https://github.com/linuxppc/issues/issues/297

So we should be able to pick it up for v5.9 hopefully.


It seems to break the build with the kernel.org 4.9.4 compiler and
corenet64_smp_defconfig:


Most likely a GCC bug ?

It seems the problem vanishes with patch 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/173de3b659fa3a5f126a0eb170522cccd909950f.1594125164.git.christophe.le...@csgroup.eu/ 



Same kind of issue in signal_64.c now.

The following patch fixes it: 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/810bd8840ef990a200f58c9dea9abe767ca02a3a.1594146723.git.christophe.le...@csgroup.eu/


Christophe

[PATCH] powerpc/signal64: Don't opencode page prefaulting

[Christophe Leroy]

Instead of doing a __get_user() from the first and last location
into a tmp var which won't be used, use fault_in_pages_readable()

Signed-off-by: Christophe Leroy 
---
 arch/powerpc/kernel/signal_64.c | 7 +++
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 55e5f76554da..c451c47538e1 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -21,6 +21,7 @@
 #include 
 #include 
 #include 
+#include 
 
 #include 
 #include 
@@ -632,7 +633,6 @@ static long setup_trampoline(unsigned int syscall, unsigned 
int __user *tramp)
 SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
struct ucontext __user *, new_ctx, long, ctx_size)
 {
-   unsigned char tmp;
sigset_t set;
unsigned long new_msr = 0;
int ctx_has_vsx_region = 0;
@@ -667,9 +667,8 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, 
old_ctx,
}
if (new_ctx == NULL)
return 0;
-   if (!access_ok(new_ctx, ctx_size)
-   || __get_user(tmp, (u8 __user *) new_ctx)
-   || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
+   if (!access_ok(new_ctx, ctx_size) ||
+   fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
return -EFAULT;
 
/*
-- 
2.25.0

Re: [PATCH 04/20] Documentation: kgdb: eliminate duplicated word

[Doug Anderson]

Hi,

On Tue, Jul 7, 2020 at 11:05 AM Randy Dunlap  wrote:
>
> Drop the doubled word "driver".
>
> Signed-off-by: Randy Dunlap 
> Cc: Jonathan Corbet 
> Cc: linux-...@vger.kernel.org
> Cc: Jason Wessel 
> Cc: Daniel Thompson 
> Cc: Douglas Anderson 
> Cc: kgdb-bugrep...@lists.sourceforge.net
> ---
>  Documentation/dev-tools/kgdb.rst |2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Douglas Anderson 

Re: [PATCH 12/20] Documentation: maintainer-entry-profile: eliminate duplicated word

[Dan Williams]

On Tue, Jul 7, 2020 at 11:07 AM Randy Dunlap  wrote:
>
> Drop the doubled word "have".
>
> Signed-off-by: Randy Dunlap 
> Cc: Jonathan Corbet 
> Cc: linux-...@vger.kernel.org
> Cc: Dan Williams 
> ---
>  Documentation/maintainer/maintainer-entry-profile.rst |2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- 
> linux-next-20200701.orig/Documentation/maintainer/maintainer-entry-profile.rst
> +++ linux-next-20200701/Documentation/maintainer/maintainer-entry-profile.rst
> @@ -31,7 +31,7 @@ Example questions to consider:
>  - What branch should contributors submit against?
>  - Links to any other Maintainer Entry Profiles? For example a
>device-driver may point to an entry for its parent subsystem. This makes
> -  the contributor aware of obligations a maintainer may have have for
> +  the contributor aware of obligations a maintainer may have for
>other maintainers in the submission chain.

Acked-by Dan Williams 

[PATCH 19/20] Documentation: virt/kvm/api: eliminate duplicated word

[Randy Dunlap]

Drop the duplicated word "struct".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Paolo Bonzini 
Cc: k...@vger.kernel.org
---
 Documentation/virt/kvm/api.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-5.8-rc3.orig/Documentation/virt/kvm/api.rst
+++ linux-5.8-rc3/Documentation/virt/kvm/api.rst
@@ -3147,7 +3147,7 @@ Possible features:
 :Capability: basic
 :Architectures: arm, arm64
 :Type: vm ioctl
-:Parameters: struct struct kvm_vcpu_init (out)
+:Parameters: struct kvm_vcpu_init (out)
 :Returns: 0 on success; -1 on error
 
 Errors:

[PATCH 18/20] Documentation: security/keys: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "in".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: James Bottomley 
Cc: Jarkko Sakkinen 
Cc: Mimi Zohar 
Cc: linux-integr...@vger.kernel.org
Cc: keyri...@vger.kernel.org
---
 Documentation/security/keys/trusted-encrypted.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/security/keys/trusted-encrypted.rst
+++ linux-next-20200701/Documentation/security/keys/trusted-encrypted.rst
@@ -200,7 +200,7 @@ Load an encrypted key "evm" from saved b
 24717c64 5972dcb82ab2dde83376d82b2e3c09ffc
 
 Other uses for trusted and encrypted keys, such as for disk and file encryption
-are anticipated.  In particular the new format 'ecryptfs' has been defined in
+are anticipated.  In particular the new format 'ecryptfs' has been defined
 in order to use encrypted keys to mount an eCryptfs filesystem.  More details
 about the usage can be found in the file
 ``Documentation/security/keys/ecryptfs.rst``.

[PATCH 17/20] Documentation: scsi/advansys: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "be".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Matthew Wilcox 
Cc: Hannes Reinecke 
Cc: linux-s...@vger.kernel.org
Cc: "James E.J. Bottomley" 
Cc: "Martin K. Petersen" 
---
 Documentation/scsi/advansys.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/scsi/advansys.rst
+++ linux-next-20200701/Documentation/scsi/advansys.rst
@@ -125,7 +125,7 @@ The following constants can be defined i
c. klogd is started with the appropriate -c parameter
   (e.g. klogd -c 8)
 
-   This will cause printk() messages to be be displayed on the
+   This will cause printk() messages to be displayed on the
current console. Refer to the klogd(8) and syslogd(8) man pages
for details.
 

[PATCH 16/20] Documentation: s390/vfio-ap: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Tony Krowiak 
Cc: Pierre Morel 
Cc: Halil Pasic 
Cc: linux-s...@vger.kernel.org
---
 Documentation/s390/vfio-ap.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/s390/vfio-ap.rst
+++ linux-next-20200701/Documentation/s390/vfio-ap.rst
@@ -361,7 +361,7 @@ matrix device.
 assign_domain / unassign_domain:
   Write-only attributes for assigning/unassigning an AP usage domain 
to/from
   the mediated matrix device. To assign/unassign a domain, the domain
-  number of the the usage domain is echoed to the respective attribute
+  number of the usage domain is echoed to the respective attribute
   file.
 matrix:
   A read-only file for displaying the APQNs derived from the cross product

[PATCH 15/20] Documentation: powerpc/vas-api: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Michael Ellerman 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: linuxppc-dev@lists.ozlabs.org
---
 Documentation/powerpc/vas-api.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/powerpc/vas-api.rst
+++ linux-next-20200701/Documentation/powerpc/vas-api.rst
@@ -43,7 +43,7 @@ engine for this process. Once a connecti
 should use the mmap() system call to map the hardware address of engine's
 request queue into the application's virtual address space.
 
-The application can then submit one or more requests to the the engine by
+The application can then submit one or more requests to the engine by
 using copy/paste instructions and pasting the CRBs to the virtual address
 (aka paste_address) returned by mmap(). User space can close the
 established connection or send window by closing the file descriptior

[PATCH 14/20] Documentation: misc/xilinx_sdfec: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Derek Kiernan 
Cc: Dragan Cvetic 
---
 Documentation/misc-devices/xilinx_sdfec.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/misc-devices/xilinx_sdfec.rst
+++ linux-next-20200701/Documentation/misc-devices/xilinx_sdfec.rst
@@ -78,7 +78,7 @@ application interfaces:
   - open: Implements restriction that only a single file descriptor can be 
open per SD-FEC instance at any time
   - release: Allows another file descriptor to be open, that is after current 
file descriptor is closed
   - poll: Provides a method to monitor for SD-FEC Error events
-  - unlocked_ioctl: Provides the the following ioctl commands that allows the 
application configure the SD-FEC core:
+  - unlocked_ioctl: Provides the following ioctl commands that allows the 
application configure the SD-FEC core:
 
- :c:macro:`XSDFEC_START_DEV`
- :c:macro:`XSDFEC_STOP_DEV`

[PATCH 13/20] Documentation: mips/ingenic-tcu: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "to".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Paul Cercueil 
Cc: Thomas Bogendoerfer 
Cc: linux-m...@vger.kernel.org
---
 Documentation/mips/ingenic-tcu.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/mips/ingenic-tcu.rst
+++ linux-next-20200701/Documentation/mips/ingenic-tcu.rst
@@ -5,7 +5,7 @@ Ingenic JZ47xx SoCs Timer/Counter Unit h
 ===
 
 The Timer/Counter Unit (TCU) in Ingenic JZ47xx SoCs is a multi-function
-hardware block. It features up to to eight channels, that can be used as
+hardware block. It features up to eight channels, that can be used as
 counters, timers, or PWM.
 
 - JZ4725B, JZ4750, JZ4755 only have six TCU channels. The other SoCs all

[PATCH 12/20] Documentation: maintainer-entry-profile: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "have".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Dan Williams 
---
 Documentation/maintainer/maintainer-entry-profile.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 
linux-next-20200701.orig/Documentation/maintainer/maintainer-entry-profile.rst
+++ linux-next-20200701/Documentation/maintainer/maintainer-entry-profile.rst
@@ -31,7 +31,7 @@ Example questions to consider:
 - What branch should contributors submit against?
 - Links to any other Maintainer Entry Profiles? For example a
   device-driver may point to an entry for its parent subsystem. This makes
-  the contributor aware of obligations a maintainer may have have for
+  the contributor aware of obligations a maintainer may have for
   other maintainers in the submission chain.
 
 

[PATCH 11/20] Documentation: leds/ledtrig-transient: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "for".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Jacek Anaszewski 
Cc: Pavel Machek 
Cc: Dan Murphy 
Cc: linux-l...@vger.kernel.org
---
 Documentation/leds/ledtrig-transient.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/leds/ledtrig-transient.rst
+++ linux-next-20200701/Documentation/leds/ledtrig-transient.rst
@@ -157,7 +157,7 @@ repeat the following step as needed::
echo 1 > activate - start timer = duration to run once
echo none > trigger
 
-This trigger is intended to be used for for the following example use cases:
+This trigger is intended to be used for the following example use cases:
 
  - Control of vibrate (phones, tablets etc.) hardware by user space app.
  - Use of LED by user space app as activity indicator.

[PATCH 10/20] Documentation: kbuild/kconfig-language: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Masahiro Yamada 
Cc: Michal Marek 
Cc: linux-kbu...@vger.kernel.org
---
 Documentation/kbuild/kconfig-language.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/kbuild/kconfig-language.rst
+++ linux-next-20200701/Documentation/kbuild/kconfig-language.rst
@@ -681,7 +681,7 @@ translate Kconfig logic into boolean for
 find dead code / features (always inactive), 114 dead features were found in
 Linux using this methodology [1]_ (Section 8: Threats to validity).
 
-Confirming this could prove useful as Kconfig stands as one of the the leading
+Confirming this could prove useful as Kconfig stands as one of the leading
 industrial variability modeling languages [1]_ [2]_. Its study would help
 evaluate practical uses of such languages, their use was only theoretical
 and real world requirements were not well understood. As it stands though

[PATCH 08/20] Documentation: hid/intel-ish-hid: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Srinivas Pandruvada 
Cc: Jiri Kosina 
Cc: linux-in...@vger.kernel.org
---
 Documentation/hid/intel-ish-hid.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/hid/intel-ish-hid.rst
+++ linux-next-20200701/Documentation/hid/intel-ish-hid.rst
@@ -235,7 +235,7 @@ There can be multiple sensor clients and
 
 To ease in implantation and allow independent driver handle each client
 this transport layer takes advantage of Linux Bus driver model. Each
-client is registered as device on the the transport bus (ishtp bus).
+client is registered as device on the transport bus (ishtp bus).
 
 Enumeration sequence of messages:
 

[PATCH 09/20] Documentation: i2c: eliminate duplicated word

[Randy Dunlap]

Drop doubled word "new".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Wolfram Sang 
Cc: linux-...@vger.kernel.org
---
 Documentation/i2c/upgrading-clients.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/i2c/upgrading-clients.rst
+++ linux-next-20200701/Documentation/i2c/upgrading-clients.rst
@@ -8,7 +8,7 @@ Introduction
 
 
 This guide outlines how to alter existing Linux 2.6 client drivers from
-the old to the new new binding methods.
+the old to the new binding methods.
 
 
 Example old-style driver

[PATCH 07/20] Documentation: gpu/drm-uapi: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "when".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: David Airlie 
Cc: Daniel Vetter 
Cc: dri-de...@lists.freedesktop.org
---
 Documentation/gpu/drm-uapi.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/gpu/drm-uapi.rst
+++ linux-next-20200701/Documentation/gpu/drm-uapi.rst
@@ -195,7 +195,7 @@ ENOSPC:
 EPERM/EACCES:
 Returned for an operation that is valid, but needs more privileges.
 E.g. root-only or much more common, DRM master-only operations return
-this when when called by unpriviledged clients. There's no clear
+this when called by unpriviledged clients. There's no clear
 difference between EACCES and EPERM.
 
 ENODEV:

[PATCH 03/20] Documentation: printk-basics: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
---
 Documentation/core-api/printk-basics.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/core-api/printk-basics.rst
+++ linux-next-20200701/Documentation/core-api/printk-basics.rst
@@ -69,7 +69,7 @@ You can check the current *console_logle
 The result shows the *current*, *default*, *minimum* and *boot-time-default* 
log
 levels.
 
-To change the current console_loglevel simply write the the desired level to
+To change the current console_loglevel simply write the desired level to
 ``/proc/sys/kernel/printk``. For example, to print all messages to the 
console::
 
   # echo 8 > /proc/sys/kernel/printk

[PATCH 06/20] Documentation: gpu/komeda-kms: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "and".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: James (Qian) Wang 
Cc: Liviu Dudau 
Cc: Mihail Atanassov 
Cc: Mali DP Maintainers 
---
 Documentation/gpu/komeda-kms.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/gpu/komeda-kms.rst
+++ linux-next-20200701/Documentation/gpu/komeda-kms.rst
@@ -41,7 +41,7 @@ Compositor blends multiple layers or pix
 frame. its output frame can be fed into post image processor for showing it on
 the monitor or fed into wb_layer and written to memory at the same time.
 user can also insert a scaler between compositor and wb_layer to down scale
-the display frame first and and then write to memory.
+the display frame first and then write to memory.
 
 Writeback Layer (wb_layer)
 --

[PATCH 05/20] Documentation: fpga: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "this".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Wu Hao 
Cc: linux-f...@vger.kernel.org
---
 Documentation/fpga/dfl.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/fpga/dfl.rst
+++ linux-next-20200701/Documentation/fpga/dfl.rst
@@ -8,7 +8,7 @@ Authors:
 - Xiao Guangrong 
 - Wu Hao 
 
-The Device Feature List (DFL) FPGA framework (and drivers according to this
+The Device Feature List (DFL) FPGA framework (and drivers according to
 this framework) hides the very details of low layer hardwares and provides
 unified interfaces to userspace. Applications could use these interfaces to
 configure, enumerate, open and access FPGA accelerators on platforms which

[PATCH 04/20] Documentation: kgdb: eliminate duplicated word

[Randy Dunlap]

Drop the doubled word "driver".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Jason Wessel 
Cc: Daniel Thompson 
Cc: Douglas Anderson 
Cc: kgdb-bugrep...@lists.sourceforge.net
---
 Documentation/dev-tools/kgdb.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/dev-tools/kgdb.rst
+++ linux-next-20200701/Documentation/dev-tools/kgdb.rst
@@ -872,7 +872,7 @@ The kgdboc driver contains logic to conf
 attached keyboard. The keyboard infrastructure is only compiled into the
 kernel when ``CONFIG_KDB_KEYBOARD=y`` is set in the kernel configuration.
 
-The core polled keyboard driver driver for PS/2 type keyboards is in
+The core polled keyboard driver for PS/2 type keyboards is in
 ``drivers/char/kdb_keyboard.c``. This driver is hooked into the debug core
 when kgdboc populates the callback in the array called
 :c:type:`kdb_poll_funcs[]`. The :c:func:`kdb_get_kbd_char` is the top-level

[PATCH 01/20] Documentation: numaperf: eliminate duplicated word

[Randy Dunlap]

Drop the duplicated word "not".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: linux...@vger.kernel.org
Cc: Mike Rapoport 
---
 Documentation/admin-guide/mm/numaperf.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-5.8-rc3.orig/Documentation/admin-guide/mm/numaperf.rst
+++ linux-5.8-rc3/Documentation/admin-guide/mm/numaperf.rst
@@ -129,7 +129,7 @@ will create the following directory::
 
/sys/devices/system/node/nodeX/memory_side_cache/
 
-If that directory is not present, the system either does not not provide
+If that directory is not present, the system either does not provide
 a memory-side cache, or that information is not accessible to the kernel.
 
 The attributes for each level of cache is provided under its cache

[PATCH 00/20] Documentation: eliminate duplicated words

[Randy Dunlap]

Drop doubled words in various parts of Documentation/.


Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: linux...@vger.kernel.org
Cc: Mike Rapoport 
Cc: Jens Axboe 
Cc: linux-bl...@vger.kernel.org
Cc: Jason Wessel 
Cc: Daniel Thompson 
Cc: Douglas Anderson 
Cc: kgdb-bugrep...@lists.sourceforge.net
Cc: Wu Hao 
Cc: linux-f...@vger.kernel.org
Cc: James (Qian) Wang 
Cc: Liviu Dudau 
Cc: Mihail Atanassov 
Cc: Mali DP Maintainers 
Cc: David Airlie 
Cc: Daniel Vetter 
Cc: dri-de...@lists.freedesktop.org
Cc: Srinivas Pandruvada 
Cc: Jiri Kosina 
Cc: linux-in...@vger.kernel.org
Cc: Wolfram Sang 
Cc: linux-...@vger.kernel.org
Cc: Masahiro Yamada 
Cc: Michal Marek 
Cc: linux-kbu...@vger.kernel.org
Cc: Jacek Anaszewski 
Cc: Pavel Machek 
Cc: Dan Murphy 
Cc: linux-l...@vger.kernel.org
Cc: Dan Williams 
Cc: Paul Cercueil 
Cc: Thomas Bogendoerfer 
Cc: linux-m...@vger.kernel.org
Cc: Derek Kiernan 
Cc: Dragan Cvetic 
Cc: Michael Ellerman 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Tony Krowiak 
Cc: Pierre Morel 
Cc: Halil Pasic 
Cc: linux-s...@vger.kernel.org
Cc: Matthew Wilcox 
Cc: Hannes Reinecke 
Cc: linux-s...@vger.kernel.org
Cc: "James E.J. Bottomley" 
Cc: "Martin K. Petersen" 
Cc: James Bottomley 
Cc: Jarkko Sakkinen 
Cc: Mimi Zohar 
Cc: linux-integr...@vger.kernel.org
Cc: keyri...@vger.kernel.org
Cc: Paolo Bonzini 
Cc: k...@vger.kernel.org
Cc: Andrew Morton 


 Documentation/admin-guide/mm/numaperf.rst |2 +-
 Documentation/block/pr.rst|2 +-
 Documentation/core-api/printk-basics.rst  |2 +-
 Documentation/dev-tools/kgdb.rst  |2 +-
 Documentation/fpga/dfl.rst|2 +-
 Documentation/gpu/drm-uapi.rst|2 +-
 Documentation/gpu/komeda-kms.rst  |2 +-
 Documentation/hid/intel-ish-hid.rst   |2 +-
 Documentation/i2c/upgrading-clients.rst   |2 +-
 Documentation/kbuild/kconfig-language.rst |2 +-
 Documentation/leds/ledtrig-transient.rst  |2 +-
 Documentation/maintainer/maintainer-entry-profile.rst |2 +-
 Documentation/mips/ingenic-tcu.rst|2 +-
 Documentation/misc-devices/xilinx_sdfec.rst   |2 +-
 Documentation/powerpc/vas-api.rst |2 +-
 Documentation/s390/vfio-ap.rst|2 +-
 Documentation/scsi/advansys.rst   |2 +-
 Documentation/security/keys/trusted-encrypted.rst |2 +-
 Documentation/virt/kvm/api.rst|2 +-
 Documentation/vm/memory-model.rst |2 +-
 20 files changed, 20 insertions(+), 20 deletions(-)

[PATCH 02/20] Documentation: block: eliminate duplicated word

[Randy Dunlap]

Change the doubled word "the" to "to the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-...@vger.kernel.org
Cc: Jens Axboe 
Cc: linux-bl...@vger.kernel.org
---
 Documentation/block/pr.rst |2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200701.orig/Documentation/block/pr.rst
+++ linux-next-20200701/Documentation/block/pr.rst
@@ -9,7 +9,7 @@ access to block devices to specific init
 setup.
 
 This document gives a general overview of the support ioctl commands.
-For a more detailed reference please refer the the SCSI Primary
+For a more detailed reference please refer to the SCSI Primary
 Commands standard, specifically the section on Reservations and the
 "PERSISTENT RESERVE IN" and "PERSISTENT RESERVE OUT" commands.
 

Re: Using Firefox hangs system

[Paul Menzel]

Dear Nicholas,


Am 07.07.20 um 09:03 schrieb Nicholas Piggin:

Excerpts from Paul Menzel's message of July 6, 2020 3:20 pm:



Am 06.07.20 um 02:41 schrieb Nicholas Piggin:

Excerpts from Paul Menzel's message of July 5, 2020 8:30 pm:



Am 05.07.20 um 11:22 schrieb Paul Menzel:

[  572.253008] Oops: Exception in kernel mode, sig: 5 [#1]
[  572.253198] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
[  572.253232] Modules linked in: tcp_diag inet_diag unix_diag xt_CHECKSUM 
xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6table_mangle 
ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 
nf_defrag_ipv4 nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter 
bridge stp llc overlay xfs kvm_hv kvm binfmt_misc joydev uas usb_storage 
vmx_crypto bnx2x crct10dif_vpmsum ofpart cmdlinepart powernv_flash mtd mdio 
ibmpowernv at24 ipmi_powernv ipmi_devintf ipmi_msghandler opal_prd powernv_rng 
sch_fq_codel parport_pc ppdev lp nfsd parport auth_rpcgss nfs_acl lockd grace 
sunrpc ip_tables x_tables autofs4 btrfs blake2b_generic libcrc32c xor 
zstd_compress raid6_pq input_leds mac_hid hid_generic ast drm_vram_helper 
drm_ttm_helper i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect 
sysimgblt fb_sys_fops drm ahci drm_panel_orientation_quirks libahci usbhid hid 
crc32c_vpmsum uio_pdrv_genirq uio
[  572.253639] CPU: 4 PID: 6728 Comm: Web Content Not tainted 5.8.0-rc3+ #1
[  572.253659] NIP:  c000ff5c LR: c001a8f8 CTR: c01d5f00
[  572.253835] REGS: c07f31f0f420 TRAP: 1500   Not tainted  (5.8.0-rc3+)
[  572.253854] MSR:  9290b033   CR: 
28c48482  XER: 2000
[  572.253888] CFAR: c000fecc IRQMASK: 1
[  572.253888] GPR00: c001b228 c07f31f0f6b0 c1f9a900 
c07f351544d0
[  572.253888] GPR04:  c07f31f0fe90 c07f351544f0 
c07f32e522b0
[  572.253888] GPR08:  2000 90009033 
c07fbcd85800
[  572.253888] GPR12: 8800 c07fb680 0005 
0004
[  572.253888] GPR16: c07f35153800 c07f35154130 0005 
0001
[  572.253888] GPR20: 0024 c07f32e51e68 c07f35154028 
007fd8da
[  572.253888] GPR24: 007fd8da c07f351544d0 c07e9a4024d0 
c1665f18
[  572.253888] GPR28: c07f351544d0 c07f35153800 9290f033 
c07f35153800
[  572.254079] NIP [c000ff5c] save_fpu+0xa8/0x2ac
[  572.254098] LR [c001a8f8] __giveup_fpu+0x28/0x80
[  572.254114] Call Trace:
[  572.254128] [c07f31f0f6b0] [c07f35153980] 0xc07f35153980 
(unreliable)
[  572.254156] [c07f31f0f6e0] [c001b228] giveup_all+0x128/0x150
[  572.254327] [c07f31f0f710] [c001c124] __switch_to+0x104/0x490
[  572.254352] [c07f31f0f770] [c10d2e34] __schedule+0x2e4/0xa10
[  572.254374] [c07f31f0f840] [c10d35d4] schedule+0x74/0x140
[  572.254397] [c07f31f0f870] [c10d9478] 
schedule_timeout+0x358/0x5d0
[  572.254424] [c07f31f0f980] [c10d5638] 
wait_for_completion+0xc8/0x210
[  572.254451] [c07f31f0fa00] [c0608ed4] do_coredump+0x3a4/0xd60
[  572.254625] [c07f31f0fba0] [c018d1cc] get_signal+0x1dc/0xd00
[  572.254648] [c07f31f0fcc0] [c001f088] 
do_notify_resume+0x158/0x450
[  572.254672] [c07f31f0fda0] [c0037d04] 
interrupt_exit_user_prepare+0x1c4/0x230
[  572.254699] [c07f31f0fe20] [c000f2b4] interrupt_return+0x14/0x1c0
[  572.254720] Instruction dump:
[  572.254882] dae60170 db060180 db260190 db4601a0 db6601b0 db8601c0 dba601d0 
dbc601e0
[  572.254912] dbe601f0 48000204 3880 f250 <7c062798> f250 38800010 
f0210a50
[  572.254946] ---[ end trace ba4452ee5c77d58e ]---


Please find all the messages attached.


"Oops: Exception in kernel mode, sig: 5 [#1]"

Unfortunately it's a very poor error message. I think it is a 0x1500
exception triggering in the kernel FP register saving. Do you have the
CONFIG_PPC_DENORMALISATION config option set?


Yes, as it’s set in the Ubuntu Linux kernel configuration, I have it set
too.

  $ grep DENORMALI /boot/config-*
  /boot/config-4.15.0-23-generic:CONFIG_PPC_DENORMALISATION=y
  /boot/config-5.4.0-40-generic:CONFIG_PPC_DENORMALISATION=y
  /boot/config-5.7.0-rc5+:CONFIG_PPC_DENORMALISATION=y
  /boot/config-5.8.0-rc3+:CONFIG_PPC_DENORMALISATION=y


Ah thanks I was able to reproduce with a little denorm test case.

The denorm interrupt handler got broken by some careless person.

This patch should hopefully fix it for you?


Yes, it does. Thank you.


---
  arch/powerpc/kernel/exceptions-64s.S | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S 
b/arch/powerpc/kernel/exceptions-64s.S
index fa080694e581..0fc8bad878b2 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -2551,7 +

Re: [PATCH 2/2] selftest/cpuidle: Add support for cpuidle latency measurement

[Pratik Sampat]

[..snip..]

+
+ins_mod()
+{
+    if [ ! -f "$MODULE" ]; then
+    printf "$MODULE module does not exist. Exitting\n"
+    exit 2


Please use ksft_skip code to indicate the test is being skipped.


Sure thing I'll use ksft_skip exit code instead.

+    fi
+    printf "Inserting $MODULE module\n\n"
+    insmod $MODULE
+    if [ $? != 0 ]; then
+    printf "Insmod $MODULE failed\n"
+    exit 2


This is fine since you expect to be able to load the module.


Thanks for the review.
Pratik

[..snip..]




thanks,
-- Shuah

Re: [PATCH 2/2] selftest/cpuidle: Add support for cpuidle latency measurement

[Shuah Khan]

On 7/7/20 9:29 AM, Pratik Rajesh Sampat wrote:

This patch adds support to trace IPI based and timer based wakeup
latency from idle states

Latches onto the test-cpuidle_latency kernel module using the debugfs
interface to send IPIs or schedule a timer based event, which in-turn
populates the debugfs with the latency measurements.

Currently for the IPI and timer tests; first disable all idle states
and then test for latency measurements incrementally enabling each state

Signed-off-by: Pratik Rajesh Sampat 
---
  tools/testing/selftests/Makefile   |   1 +
  tools/testing/selftests/cpuidle/Makefile   |   6 +
  tools/testing/selftests/cpuidle/cpuidle.sh | 240 +
  tools/testing/selftests/cpuidle/settings   |   1 +
  4 files changed, 248 insertions(+)
  create mode 100644 tools/testing/selftests/cpuidle/Makefile
  create mode 100755 tools/testing/selftests/cpuidle/cpuidle.sh
  create mode 100644 tools/testing/selftests/cpuidle/settings

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 1195bd85af38..ab6cf51f3518 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -7,6 +7,7 @@ TARGETS += capabilities
  TARGETS += cgroup
  TARGETS += clone3
  TARGETS += cpufreq
+TARGETS += cpuidle
  TARGETS += cpu-hotplug
  TARGETS += drivers/dma-buf
  TARGETS += efivarfs
diff --git a/tools/testing/selftests/cpuidle/Makefile 
b/tools/testing/selftests/cpuidle/Makefile
new file mode 100644
index ..72fd5d2e974d
--- /dev/null
+++ b/tools/testing/selftests/cpuidle/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+all:
+
+TEST_PROGS := cpuidle.sh
+
+include ../lib.mk
diff --git a/tools/testing/selftests/cpuidle/cpuidle.sh 
b/tools/testing/selftests/cpuidle/cpuidle.sh
new file mode 100755
index ..11666fe47c34
--- /dev/null
+++ b/tools/testing/selftests/cpuidle/cpuidle.sh
@@ -0,0 +1,240 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+LOG=cpuidle.log
+MODULE=/lib/modules/$(uname -r)/kernel/drivers/cpuidle/test-cpuidle_latency.ko
+
+helpme()
+{
+   printf "Usage: $0 [-h] [-todg args]
+   [-h ]
+   [-m ]
+   [-o ]
+   \n"
+   exit 2
+}
+
+parse_arguments()
+{
+   while getopts ht:m:o: arg
+   do
+   case $arg in
+   h) # --help
+   helpme
+   ;;
+   m) # --mod-file
+   MODULE=$OPTARG
+   ;;
+   o) # output log files
+   LOG=$OPTARG
+   ;;
+   \?)
+   helpme
+   ;;
+   esac
+   done
+}
+
+ins_mod()
+{
+   if [ ! -f "$MODULE" ]; then
+   printf "$MODULE module does not exist. Exitting\n"
+   exit 2


Please use ksft_skip code to indicate the test is being skipped.


+   fi
+   printf "Inserting $MODULE module\n\n"
+   insmod $MODULE
+   if [ $? != 0 ]; then
+   printf "Insmod $MODULE failed\n"
+   exit 2


This is fine since you expect to be able to load the module.


+   fi
+}
+
+compute_average()
+{
+   arr=("$@")
+   sum=0
+   size=${#arr[@]}
+   for i in "${arr[@]}"
+   do
+   sum=$((sum + i))
+   done
+   avg=$((sum/size))
+}
+
+# Disable all stop states
+disable_idle()
+{
+   for ((cpu=0; cpu 
/sys/devices/system/cpu/cpu$cpu/cpuidle/state$state/disable
+   done
+   done
+}
+
+# Enable the idle state supplied
+# $1: State to enable
+enable_state()
+{
+   for ((cpu=0; cpu /sys/devices/system/cpu/cpu$cpu/cpuidle/state$1/disable
+   done
+}
+
+# Extract latency in microseconds and convert to nanoseconds
+extract_latency()
+{
+   for ((state=0; state /dev/null &
+   yes_pid=$!
+fi
+taskset 0x1 echo $dest_cpu > 
/sys/kernel/debug/latency_test/ipi_cpu_dest
+ipi_latency=$(cat /sys/kernel/debug/latency_test/ipi_latency_ns)
+src_cpu=$(cat /sys/kernel/debug/latency_test/ipi_cpu_src)
+if [ "$1" = "baseline" ]; then
+   kill $yes_pid
+   wait $yes_pid 2>/dev/null
+fi
+}
+
+# Incrementally Enable idle states one by one and compute the latency
+run_ipi_tests()
+{
+extract_latency
+disable_idle
+declare -a avg_arr
+declare -a baseline_avg_array
+
+echo -e "--IPI Latency Test---" >> $LOG
+for ((state=0; state> $LOG
+   enable_state $state
+   printf "%s %10s %12s %12s\n" "SRC_CPU" "DEST_CPU" 
"Base_IPI_Latency(ns)" "IPI_Latency(ns)" >> $LOG
+   unset avg_arr
+   unset baseline_avg_arr
+   for ((cpu=0; cpu> $LOG
+   avg_arr+=($ipi_l

Re: kernel since 5.6 do not boot anymore on Apple PowerBook

[Giuseppe Sacco]

Il giorno mar, 07/07/2020 alle 16.52 +0200, Christophe Leroy ha
scritto:
> 
> Le 07/07/2020 à 16:03, Giuseppe Sacco a écrit :
> > Hello Cristophe,
> > 
> > > Can you tell which defconfig you use or provide your .config
> > 
> > You may get the standard one from debian or a reduced one that I
> > made on purpose. The latter is here:
> > https://eppesuigoccas.homedns.org/~giuseppe/config-5.4.50.gz
> >  (boot)
> > https://eppesuigoccas.homedns.org/~giuseppe/config-5.6.19.gz
> >  (no boot)
> 
> Thanks
> 
> Can you provide the complete output when it works, so that I can see 
> what is after the place it stops when it fails.

Here it is:
https://eppesuigoccas.homedns.org/~giuseppe/dmesg-5.4.40-minimo.gz

> And can you try without CONFIG_VMAP_STACK on 5.6.19

Sure, I'll let you know.

Thank you,
Giuseppe

[PATCH 2/2] selftest/cpuidle: Add support for cpuidle latency measurement

[Pratik Rajesh Sampat]

This patch adds support to trace IPI based and timer based wakeup
latency from idle states

Latches onto the test-cpuidle_latency kernel module using the debugfs
interface to send IPIs or schedule a timer based event, which in-turn
populates the debugfs with the latency measurements.

Currently for the IPI and timer tests; first disable all idle states
and then test for latency measurements incrementally enabling each state

Signed-off-by: Pratik Rajesh Sampat 
---
 tools/testing/selftests/Makefile   |   1 +
 tools/testing/selftests/cpuidle/Makefile   |   6 +
 tools/testing/selftests/cpuidle/cpuidle.sh | 240 +
 tools/testing/selftests/cpuidle/settings   |   1 +
 4 files changed, 248 insertions(+)
 create mode 100644 tools/testing/selftests/cpuidle/Makefile
 create mode 100755 tools/testing/selftests/cpuidle/cpuidle.sh
 create mode 100644 tools/testing/selftests/cpuidle/settings

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 1195bd85af38..ab6cf51f3518 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -7,6 +7,7 @@ TARGETS += capabilities
 TARGETS += cgroup
 TARGETS += clone3
 TARGETS += cpufreq
+TARGETS += cpuidle
 TARGETS += cpu-hotplug
 TARGETS += drivers/dma-buf
 TARGETS += efivarfs
diff --git a/tools/testing/selftests/cpuidle/Makefile 
b/tools/testing/selftests/cpuidle/Makefile
new file mode 100644
index ..72fd5d2e974d
--- /dev/null
+++ b/tools/testing/selftests/cpuidle/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+all:
+
+TEST_PROGS := cpuidle.sh
+
+include ../lib.mk
diff --git a/tools/testing/selftests/cpuidle/cpuidle.sh 
b/tools/testing/selftests/cpuidle/cpuidle.sh
new file mode 100755
index ..11666fe47c34
--- /dev/null
+++ b/tools/testing/selftests/cpuidle/cpuidle.sh
@@ -0,0 +1,240 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+LOG=cpuidle.log
+MODULE=/lib/modules/$(uname -r)/kernel/drivers/cpuidle/test-cpuidle_latency.ko
+
+helpme()
+{
+   printf "Usage: $0 [-h] [-todg args]
+   [-h ]
+   [-m ]
+   [-o ]
+   \n"
+   exit 2
+}
+
+parse_arguments()
+{
+   while getopts ht:m:o: arg
+   do
+   case $arg in
+   h) # --help
+   helpme
+   ;;
+   m) # --mod-file
+   MODULE=$OPTARG
+   ;;
+   o) # output log files
+   LOG=$OPTARG
+   ;;
+   \?)
+   helpme
+   ;;
+   esac
+   done
+}
+
+ins_mod()
+{
+   if [ ! -f "$MODULE" ]; then
+   printf "$MODULE module does not exist. Exitting\n"
+   exit 2
+   fi
+   printf "Inserting $MODULE module\n\n"
+   insmod $MODULE
+   if [ $? != 0 ]; then
+   printf "Insmod $MODULE failed\n"
+   exit 2
+   fi
+}
+
+compute_average()
+{
+   arr=("$@")
+   sum=0
+   size=${#arr[@]}
+   for i in "${arr[@]}"
+   do
+   sum=$((sum + i))
+   done
+   avg=$((sum/size))
+}
+
+# Disable all stop states
+disable_idle()
+{
+   for ((cpu=0; cpu 
/sys/devices/system/cpu/cpu$cpu/cpuidle/state$state/disable
+   done
+   done
+}
+
+# Enable the idle state supplied
+# $1: State to enable
+enable_state()
+{
+   for ((cpu=0; cpu /sys/devices/system/cpu/cpu$cpu/cpuidle/state$1/disable
+   done
+}
+
+# Extract latency in microseconds and convert to nanoseconds
+extract_latency()
+{
+   for ((state=0; state /dev/null &
+   yes_pid=$!
+fi
+taskset 0x1 echo $dest_cpu > 
/sys/kernel/debug/latency_test/ipi_cpu_dest
+ipi_latency=$(cat /sys/kernel/debug/latency_test/ipi_latency_ns)
+src_cpu=$(cat /sys/kernel/debug/latency_test/ipi_cpu_src)
+if [ "$1" = "baseline" ]; then
+   kill $yes_pid
+   wait $yes_pid 2>/dev/null
+fi
+}
+
+# Incrementally Enable idle states one by one and compute the latency
+run_ipi_tests()
+{
+extract_latency
+disable_idle
+declare -a avg_arr
+declare -a baseline_avg_array
+
+echo -e "--IPI Latency Test---" >> $LOG
+for ((state=0; state> $LOG
+   enable_state $state
+   printf "%s %10s %12s %12s\n" "SRC_CPU" "DEST_CPU" 
"Base_IPI_Latency(ns)" "IPI_Latency(ns)" >> $LOG
+   unset avg_arr
+   unset baseline_avg_arr
+   for ((cpu=0; cpu> $LOG
+   avg_arr+=($ipi_latency)
+   baseline_avg_arr+=($baseline_ipi_latency)
+   done
+   compute_average "${avg_arr[@]}"
+   local 

[PATCH 1/2] cpuidle: Trace IPI based and timer based wakeup latency from idle states

[Pratik Rajesh Sampat]

Fire directed smp_call_function_single IPIs from a specified source
CPU to the specified target CPU to reduce the noise we have to wade
through in the trace log.
The module is based on the idea written by Srivatsa Bhat and maintained
by Vaidyanathan Srinivasan internally.

Queue HR timer and measure jitter. Wakeup latency measurement for idle
states using hrtimer.  Echo a value in ns to timer_test_function and
watch trace. A HRtimer will be queued and when it fires the expected
wakeup vs actual wakeup is computes and delay printed in ns.

Implemented as a module which utilizes debugfs so that it can be
integrated with selftests.

To include the module, check option and include as module
kernel hacking -> Cpuidle latency selftests

[srivatsa.b...@linux.vnet.ibm.com: Initial implementation in
 cpidle/sysfs]

[sva...@linux.vnet.ibm.com: wakeup latency measurements using hrtimer
 and fix some of the time calculation]

[e...@linux.vnet.ibm.com: Fix some whitespace and tab errors and
 increase the resolution of IPI wakeup]

Signed-off-by: Pratik Rajesh Sampat 
---
 drivers/cpuidle/Makefile   |   1 +
 drivers/cpuidle/test-cpuidle_latency.c | 150 +
 lib/Kconfig.debug  |  10 ++
 3 files changed, 161 insertions(+)
 create mode 100644 drivers/cpuidle/test-cpuidle_latency.c

diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index f07800cbb43f..2ae05968078c 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o
 obj-$(CONFIG_DT_IDLE_STATES) += dt_idle_states.o
 obj-$(CONFIG_ARCH_HAS_CPU_RELAX) += poll_state.o
 obj-$(CONFIG_HALTPOLL_CPUIDLE)   += cpuidle-haltpoll.o
+obj-$(CONFIG_IDLE_LATENCY_SELFTEST)  += test-cpuidle_latency.o
 
 
##
 # ARM SoC drivers
diff --git a/drivers/cpuidle/test-cpuidle_latency.c 
b/drivers/cpuidle/test-cpuidle_latency.c
new file mode 100644
index ..61574665e972
--- /dev/null
+++ b/drivers/cpuidle/test-cpuidle_latency.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Module-based API test facility for cpuidle latency using IPIs and timers
+ */
+
+#include 
+#include 
+#include 
+
+/* IPI based wakeup latencies */
+struct latency {
+   unsigned int src_cpu;
+   unsigned int dest_cpu;
+   ktime_t time_start;
+   ktime_t time_end;
+   u64 latency_ns;
+} ipi_wakeup;
+
+static void measure_latency(void *info)
+{
+   struct latency *v;
+   ktime_t time_diff;
+
+   v = (struct latency *)info;
+   v->time_end = ktime_get();
+   time_diff = ktime_sub(v->time_end, v->time_start);
+   v->latency_ns = ktime_to_ns(time_diff);
+}
+
+void run_smp_call_function_test(unsigned int cpu)
+{
+   ipi_wakeup.src_cpu = smp_processor_id();
+   ipi_wakeup.dest_cpu = cpu;
+   ipi_wakeup.time_start = ktime_get();
+   smp_call_function_single(cpu, measure_latency, &ipi_wakeup, 1);
+}
+
+/* Timer based wakeup latencies */
+struct timer_data {
+   unsigned int src_cpu;
+   u64 timeout;
+   ktime_t time_start;
+   ktime_t time_end;
+   struct hrtimer timer;
+   u64 timeout_diff_ns;
+} timer_wakeup;
+
+static enum hrtimer_restart timer_called(struct hrtimer *hrtimer)
+{
+   struct timer_data *w;
+   ktime_t time_diff;
+
+   w = container_of(hrtimer, struct timer_data, timer);
+   w->time_end = ktime_get();
+
+   time_diff = ktime_sub(w->time_end, w->time_start);
+   time_diff = ktime_sub(time_diff, ns_to_ktime(w->timeout));
+   w->timeout_diff_ns = ktime_to_ns(time_diff);
+   return HRTIMER_NORESTART;
+}
+
+static void run_timer_test(unsigned int ns)
+{
+   hrtimer_init(&timer_wakeup.timer, CLOCK_MONOTONIC,
+HRTIMER_MODE_REL);
+   timer_wakeup.timer.function = timer_called;
+   timer_wakeup.time_start = ktime_get();
+   timer_wakeup.src_cpu = smp_processor_id();
+   timer_wakeup.timeout = ns;
+
+   hrtimer_start(&timer_wakeup.timer, ns_to_ktime(ns),
+ HRTIMER_MODE_REL_PINNED);
+}
+
+static struct dentry *dir;
+
+static int cpu_read_op(void *data, u64 *value)
+{
+   *value = ipi_wakeup.dest_cpu;
+   return 0;
+}
+
+static int cpu_write_op(void *data, u64 value)
+{
+   run_smp_call_function_test(value);
+   return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(ipi_ops, cpu_read_op, cpu_write_op, "%llu\n");
+
+static int timeout_read_op(void *data, u64 *value)
+{
+   *value = timer_wakeup.timeout;
+   return 0;
+}
+
+static int timeout_write_op(void *data, u64 value)
+{
+   run_timer_test(value);
+   return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(timeout_ops, timeout_read_op, timeout_write_op, 
"%llu\n");
+
+static int __init latency_init(void)
+{
+   struct dentry *temp;
+
+   dir = debugfs_create_dir("latency_test", 0);
+   if (!dir) {

[PATCH 0/2] Selftest for cpuidle latency measurement

[Pratik Rajesh Sampat]

The patch series introduces a mechanism to measure wakeup latency for
IPI and timer based interrupts
The motivation behind this series is to find significant deviations
behind advertised latency and resisdency values

To achieve this, we introduce a kernel module and expose its control
knobs through the debugfs interface that the selftests can engage with.

The kernel module provides the following interfaces within
/sys/kernel/debug/latency_test/ for,
1. IPI test:
  ipi_cpu_dest   # Destination CPU for the IPI
  ipi_cpu_src# Origin of the IPI
  ipi_latency_ns # Measured latency time in ns
2. Timeout test:
  timeout_cpu_src # CPU on which the timer to be queued
  timeout_expected_ns # Timer duration
  timeout_diff_ns # Difference of actual duration vs expected timer
To include the module, check option and include as module
kernel hacking -> Cpuidle latency selftests

The selftest inserts the module, disables all the idle states and
enables them one by one testing:
1. Keeping source CPU constant, iterates through all the CPUS measuring
   IPI latency for baseline (CPU is busy with "yes" workload) and the
   when the CPU is at rest
2. Iterating through all the CPUs, sending expected timer durations to
   be equivalent to the residency of the the deepest idle state
   enabled and extracting the difference in time between the time of
   wakeup and the expected timer duration

Usage
-
Can be used in conjuction to the rest of the selftests.
Default Output location in: tools/testing/cpuidle/cpuidle.log

To run this test specifically:
$ make -C tools/testing/selftests TARGETS="cpuidle" run_tests

There are a few optinal arguments too that the script can take
[-h ]
[-m ]
[-o ]

Sample output snippet
-
--IPI Latency Test---
---Enabling state: 0---
SRC_CPU   DEST_CPU Base_IPI_Latency(ns) IPI_Latency(ns)
00  328291
01 1500   1071
02 1070   1062
03 1557   1668
. . . .
Expected IPI latency(ns): 1000
Baseline Average IPI latency(ns): 1113
Observed Average IPI latency(ns): 1023
--Timeout Latency Test--
---Enabling state: 0---
Wakeup_src Baseline_delay(ns)  Delay(ns)
03134   2128
12275   2107
2   2198
32421   2325
. . . .
Expected timeout(ns): 200
Baseline Average timeout diff(ns): 2513
Observed Average timeout diff(ns): 2189

Pratik Rajesh Sampat (2):
  cpuidle: Trace IPI based and timer based wakeup latency from idle
states
  selftest/cpuidle: Add support for cpuidle latency measurement

 drivers/cpuidle/Makefile   |   1 +
 drivers/cpuidle/test-cpuidle_latency.c | 150 +
 lib/Kconfig.debug  |  10 +
 tools/testing/selftests/Makefile   |   1 +
 tools/testing/selftests/cpuidle/Makefile   |   6 +
 tools/testing/selftests/cpuidle/cpuidle.sh | 240 +
 tools/testing/selftests/cpuidle/settings   |   1 +
 7 files changed, 409 insertions(+)
 create mode 100644 drivers/cpuidle/test-cpuidle_latency.c
 create mode 100644 tools/testing/selftests/cpuidle/Makefile
 create mode 100755 tools/testing/selftests/cpuidle/cpuidle.sh
 create mode 100644 tools/testing/selftests/cpuidle/settings

-- 
2.25.4

Re: kernel since 5.6 do not boot anymore on Apple PowerBook

[Christophe Leroy]

Le 07/07/2020 à 16:03, Giuseppe Sacco a écrit :

Hello Cristophe,

Il giorno mar, 07/07/2020 alle 15.35 +0200, Christophe Leroy ha
scritto:

Hi,
Le 07/07/2020 à 14:58, Giuseppe Sacco a écrit :

[...]

So, I am looking for help. How may I better investigate the
problem?
How may I crossbuild the kernel on a faster machine (amd64) in
order to
try git-bisect without waiting ages?


To crossbuild, use cross tools at
https://mirrors.edge.kernel.org/pub/tools/crosstool/


thank you, I'll have a look at it.


Can you tell which defconfig you use or provide your .config


You may get the standard one from debian or a reduced one that I made
on purpose. The latter is here:
https://eppesuigoccas.homedns.org/~giuseppe/config-5.4.50.gz (boot)
https://eppesuigoccas.homedns.org/~giuseppe/config-5.6.19.gz (no boot)



Thanks

Can you provide the complete output when it works, so that I can see 
what is after the place it stops when it fails.


And can you try without CONFIG_VMAP_STACK on 5.6.19

Christophe

Re: [PATCH 1/4] dma-mapping: move the remaining DMA API calls out of line

[Christoph Hellwig]

On Tue, Jul 07, 2020 at 10:43:10AM +1000, Alexey Kardashevskiy wrote:
> Any luck there? I'd really like to cross this off my todo list :) Thanks,

We had another incident with new net code poking into dma internals
blocking this series.  That is now sorted out, so the series is back
on track.

[PATCH v2 10/28] ASoC: fsl: fsl_esai: Add descriptions for 'tx_mask' and 'rx_mask' to 'fsl_esai'

[Lee Jones]

Fixes the following W=1 kernel build warning(s):

 sound/soc/fsl/fsl_esai.c:86: warning: Function parameter or member 'tx_mask' 
not described in 'fsl_esai'
 sound/soc/fsl/fsl_esai.c:86: warning: Function parameter or member 'rx_mask' 
not described in 'fsl_esai'

Cc: Timur Tabi 
Cc: Nicolin Chen 
Cc: Xiubo Li 
Cc: Fabio Estevam 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones 
---
 sound/soc/fsl/fsl_esai.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index bb3c405df623c..3f67f4a465780 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -49,6 +49,8 @@ struct fsl_esai_soc_data {
  * @fifo_depth: depth of tx/rx FIFO
  * @slot_width: width of each DAI slot
  * @slots: number of slots
+ * @tx_mask: tx register mask
+ * @rx_mask: rx register mask
  * @channels: channel num for tx or rx
  * @hck_rate: clock rate of desired HCKx clock
  * @sck_rate: clock rate of desired SCKx clock
-- 
2.25.1

[PATCH v2 09/28] ASoC: fsl: fsl_esai: Fix a bunch of kerneldoc issues

[Lee Jones]

Struct headers require a 'struct $NAME' title, all function parameters
require a description and need to be in the format '@.*:', else the
checker gets confused.  Also demote one kerneldoc header where no effort
was made to document any of the function's params.

Fixes the following W=1 kernel build warning(s):

 sound/soc/fsl/fsl_esai.c:30: warning: cannot understand function prototype: 
'struct fsl_esai_soc_data '
 sound/soc/fsl/fsl_esai.c:61: warning: cannot understand function prototype: 
'struct fsl_esai '
 sound/soc/fsl/fsl_esai.c:170: warning: Function parameter or member 'dai' not 
described in 'fsl_esai_divisor_cal'
 sound/soc/fsl/fsl_esai.c:265: warning: Function parameter or member 'dai' not 
described in 'fsl_esai_set_dai_sysclk'
 sound/soc/fsl/fsl_esai.c:265: warning: Function parameter or member 'clk_id' 
not described in 'fsl_esai_set_dai_sysclk'
 sound/soc/fsl/fsl_esai.c:265: warning: Function parameter or member 'freq' not 
described in 'fsl_esai_set_dai_sysclk'
 sound/soc/fsl/fsl_esai.c:265: warning: Function parameter or member 'dir' not 
described in 'fsl_esai_set_dai_sysclk'
 sound/soc/fsl/fsl_esai.c:265: warning: Excess function parameter 'Parameters' 
description in 'fsl_esai_set_dai_sysclk'
 sound/soc/fsl/fsl_esai.c:364: warning: Function parameter or member 'dai' not 
described in 'fsl_esai_set_bclk'
 sound/soc/fsl/fsl_esai.c:364: warning: Function parameter or member 'tx' not 
described in 'fsl_esai_set_bclk'
 sound/soc/fsl/fsl_esai.c:364: warning: Function parameter or member 'freq' not 
described in 'fsl_esai_set_bclk'

Cc: Timur Tabi 
Cc: Nicolin Chen 
Cc: Xiubo Li 
Cc: Fabio Estevam 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones 
---
 sound/soc/fsl/fsl_esai.c | 17 +
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index cbcb70d6f8c83..bb3c405df623c 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -22,7 +22,7 @@
SNDRV_PCM_FMTBIT_S24_LE)
 
 /**
- * fsl_esai_soc_data: soc specific data
+ * struct fsl_esai_soc_data - soc specific data
  *
  * @imx: for imx platform
  * @reset_at_xrun: flags for enable reset operaton
@@ -33,7 +33,7 @@ struct fsl_esai_soc_data {
 };
 
 /**
- * fsl_esai: ESAI private data
+ * struct fsl_esai - ESAI private data
  *
  * @dma_params_rx: DMA parameters for receive channel
  * @dma_params_tx: DMA parameters for transmit channel
@@ -160,10 +160,11 @@ static irqreturn_t esai_isr(int irq, void *devid)
  * This function is used to calculate the divisors of psr, pm, fp and it is
  * supposed to be called in set_dai_sysclk() and set_bclk().
  *
+ * @dai: SoC DAI
+ * @tx: current setting is for playback or capture
  * @ratio: desired overall ratio for the paticipating dividers
  * @usefp: for HCK setting, there is no need to set fp divider
  * @fp: bypass other dividers by setting fp directly if fp != 0
- * @tx: current setting is for playback or capture
  */
 static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio,
bool usefp, u32 fp)
@@ -252,11 +253,11 @@ static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, 
bool tx, u32 ratio,
 /**
  * This function mainly configures the clock frequency of MCLK (HCKT/HCKR)
  *
- * @Parameters:
- * clk_id: The clock source of HCKT/HCKR
+ * @dai: SoC DAI
+ * @clk_id: The clock source of HCKT/HCKR
  *   (Input from outside; output from inside, FSYS or EXTAL)
- * freq: The required clock rate of HCKT/HCKR
- * dir: The clock direction of HCKT/HCKR
+ * @freq: The required clock rate of HCKT/HCKR
+ * @dir: The clock direction of HCKT/HCKR
  *
  * Note: If the direction is input, we do not care about clk_id.
  */
@@ -357,7 +358,7 @@ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, 
int clk_id,
return 0;
 }
 
-/**
+/*
  * This function configures the related dividers according to the bclk rate
  */
 static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
-- 
2.25.1

[PATCH v2 08/28] ASoC: fsl: fsl_spdif: Update 'struct fsl_spdif_priv's descriptions

[Lee Jones]

Two descriptions for 'soc' and 'regcache_srpc' were missing.  Add them.

Fixes the following W=1 kernel build warning(s):

 sound/soc/fsl/fsl_spdif.c:125: warning: Function parameter or member 'soc' not 
described in 'fsl_spdif_priv'
 sound/soc/fsl/fsl_spdif.c:125: warning: Function parameter or member 
'regcache_srpc' not described in 'fsl_spdif_priv'

Cc: Timur Tabi 
Cc: Nicolin Chen 
Cc: Xiubo Li 
Cc: Fabio Estevam 
Cc: Vladimir Barinov 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones 
---
 sound/soc/fsl/fsl_spdif.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index 7aa3bdec5b6b5..f0b2375a9246f 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -83,6 +83,7 @@ struct spdif_mixer_control {
 /**
  * struct fsl_spdif_priv - Freescale SPDIF private data
  *
+ * @soc: SoC specific data
  * @fsl_spdif_control: SPDIF control data
  * @cpu_dai_drv: cpu dai driver
  * @pdev: platform device pointer
@@ -100,6 +101,7 @@ struct spdif_mixer_control {
  * @spbaclk: SPBA clock (optional, depending on SoC design)
  * @dma_params_tx: DMA parameters for transmit channel
  * @dma_params_rx: DMA parameters for receive channel
+ * @regcache_srpc: regcache for SRPC
  */
 struct fsl_spdif_priv {
const struct fsl_spdif_soc_data *soc;
@@ -120,7 +122,6 @@ struct fsl_spdif_priv {
struct clk *spbaclk;
struct snd_dmaengine_dai_dma_data dma_params_tx;
struct snd_dmaengine_dai_dma_data dma_params_rx;
-   /* regcache for SRPC */
u32 regcache_srpc;
 };
 
-- 
2.25.1

[PATCH v2 07/28] ASoC: fsl: fsl_spdif: Use correct formatting when denoting struct documentation

[Lee Jones]

Kerneldoc expects struct documentation to start with "struct $NAME".

Fixes the following W=1 kernel build warning(s):

 sound/soc/fsl/fsl_spdif.c:104: warning: cannot understand function prototype: 
'struct fsl_spdif_priv '

Cc: Timur Tabi 
Cc: Nicolin Chen 
Cc: Xiubo Li 
Cc: Fabio Estevam 
Cc: Vladimir Barinov 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones 
---
 sound/soc/fsl/fsl_spdif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index 5b2689ae63d4d..7aa3bdec5b6b5 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -81,7 +81,7 @@ struct spdif_mixer_control {
 };
 
 /**
- * fsl_spdif_priv: Freescale SPDIF private data
+ * struct fsl_spdif_priv - Freescale SPDIF private data
  *
  * @fsl_spdif_control: SPDIF control data
  * @cpu_dai_drv: cpu dai driver
-- 
2.25.1

[PATCH v2 06/28] ASoC: fsl: fsl_ssi_dbg: Demote obvious misuse of kerneldoc to standard comment blocks

[Lee Jones]

No attempt has been made to document either of the demoted functions here.

Fixes the following W=1 kernel build warning(s):

 sound/soc/fsl/fsl_ssi_dbg.c:90: warning: Function parameter or member 'flag' 
not described in 'SIER_SHOW'
 sound/soc/fsl/fsl_ssi_dbg.c:90: warning: Function parameter or member 'name' 
not described in 'SIER_SHOW'
 sound/soc/fsl/fsl_ssi_dbg.c:99: warning: Function parameter or member 's' not 
described in 'fsl_ssi_stats_show'
 sound/soc/fsl/fsl_ssi_dbg.c:99: warning: Function parameter or member 'unused' 
not described in 'fsl_ssi_stats_show'

Cc: Timur Tabi 
Cc: Nicolin Chen 
Cc: Xiubo Li 
Cc: Fabio Estevam 
Cc: Markus Pargmann 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones 
---
 sound/soc/fsl/fsl_ssi_dbg.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi_dbg.c b/sound/soc/fsl/fsl_ssi_dbg.c
index 2a20ee23dc52d..2c46c55f0a882 100644
--- a/sound/soc/fsl/fsl_ssi_dbg.c
+++ b/sound/soc/fsl/fsl_ssi_dbg.c
@@ -78,7 +78,7 @@ void fsl_ssi_dbg_isr(struct fsl_ssi_dbg *dbg, u32 sisr)
dbg->stats.tfe0++;
 }
 
-/**
+/*
  * Show the statistics of a flag only if its interrupt is enabled
  *
  * Compilers will optimize it to a no-op if the interrupt is disabled
@@ -90,7 +90,7 @@ void fsl_ssi_dbg_isr(struct fsl_ssi_dbg *dbg, u32 sisr)
} while (0)
 
 
-/**
+/*
  * Display the statistics for the current SSI device
  *
  * To avoid confusion, only show those counts that are enabled
-- 
2.25.1

[PATCH v2 05/28] ASoC: fsl: fsl_ssi: Demote obvious misuse of kerneldoc to standard comment blocks

[Lee Jones]

No attempt has been made to document any of the demoted functions here.

Fixes the following W=1 kernel build warning(s):

 sound/soc/fsl/fsl_ssi.c:380: warning: Function parameter or member 'irq' not 
described in 'fsl_ssi_isr'
 sound/soc/fsl/fsl_ssi.c:380: warning: Function parameter or member 'dev_id' 
not described in 'fsl_ssi_isr'
 sound/soc/fsl/fsl_ssi.c:406: warning: Function parameter or member 'ssi' not 
described in 'fsl_ssi_config_enable'
 sound/soc/fsl/fsl_ssi.c:406: warning: Function parameter or member 'tx' not 
described in 'fsl_ssi_config_enable'
 sound/soc/fsl/fsl_ssi.c:506: warning: Function parameter or member 'ssi' not 
described in 'fsl_ssi_config_disable'
 sound/soc/fsl/fsl_ssi.c:506: warning: Function parameter or member 'tx' not 
described in 'fsl_ssi_config_disable'
 sound/soc/fsl/fsl_ssi.c:583: warning: Function parameter or member 'ssi' not 
described in 'fsl_ssi_setup_regvals'
 sound/soc/fsl/fsl_ssi.c:675: warning: Function parameter or member 'substream' 
not described in 'fsl_ssi_set_bclk'
 sound/soc/fsl/fsl_ssi.c:675: warning: Function parameter or member 'dai' not 
described in 'fsl_ssi_set_bclk'
 sound/soc/fsl/fsl_ssi.c:675: warning: Function parameter or member 'hw_params' 
not described in 'fsl_ssi_set_bclk'
 sound/soc/fsl/fsl_ssi.c:798: warning: Function parameter or member 'substream' 
not described in 'fsl_ssi_hw_params'
 sound/soc/fsl/fsl_ssi.c:798: warning: Function parameter or member 'hw_params' 
not described in 'fsl_ssi_hw_params'
 sound/soc/fsl/fsl_ssi.c:798: warning: Function parameter or member 'dai' not 
described in 'fsl_ssi_hw_params'
 sound/soc/fsl/fsl_ssi.c:1003: warning: Function parameter or member 'dai' not 
described in 'fsl_ssi_set_dai_fmt'
 sound/soc/fsl/fsl_ssi.c:1003: warning: Function parameter or member 'fmt' not 
described in 'fsl_ssi_set_dai_fmt'
 sound/soc/fsl/fsl_ssi.c:1018: warning: Function parameter or member 'dai' not 
described in 'fsl_ssi_set_dai_tdm_slot'
 sound/soc/fsl/fsl_ssi.c:1018: warning: Function parameter or member 'tx_mask' 
not described in 'fsl_ssi_set_dai_tdm_slot'
 sound/soc/fsl/fsl_ssi.c:1018: warning: Function parameter or member 'rx_mask' 
not described in 'fsl_ssi_set_dai_tdm_slot'
 sound/soc/fsl/fsl_ssi.c:1018: warning: Function parameter or member 'slots' 
not described in 'fsl_ssi_set_dai_tdm_slot'
 sound/soc/fsl/fsl_ssi.c:1018: warning: Function parameter or member 
'slot_width' not described in 'fsl_ssi_set_dai_tdm_slot'
 sound/soc/fsl/fsl_ssi.c:1065: warning: Function parameter or member 
'substream' not described in 'fsl_ssi_trigger'
 sound/soc/fsl/fsl_ssi.c:1065: warning: Function parameter or member 'cmd' not 
described in 'fsl_ssi_trigger'
 sound/soc/fsl/fsl_ssi.c:1065: warning: Function parameter or member 'dai' not 
described in 'fsl_ssi_trigger'
 sound/soc/fsl/fsl_ssi.c:1245: warning: Function parameter or member 'ssi' not 
described in 'fsl_ssi_hw_init'
 sound/soc/fsl/fsl_ssi.c:1274: warning: Function parameter or member 'ssi' not 
described in 'fsl_ssi_hw_clean'
 sound/soc/fsl/fsl_ssi.c:1292: warning: Function parameter or member 's' not 
described in 'make_lowercase'

Also use correct formatting when documenting structs:

 sound/soc/fsl/fsl_ssi.c:258: warning: cannot understand function prototype: 
'struct fsl_ssi '

Cc: Timur Tabi 
Cc: Nicolin Chen 
Cc: Xiubo Li 
Cc: Fabio Estevam 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones 
---
 sound/soc/fsl/fsl_ssi.c | 28 ++--
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 1a2fa7f181423..5717d664cde1e 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -203,7 +203,7 @@ struct fsl_ssi_soc_data {
 };
 
 /**
- * fsl_ssi: per-SSI private data
+ * struct fsl_ssi - per-SSI private data
  *
  * @regs: Pointer to the regmap registers
  * @irq: IRQ of this SSI
@@ -373,7 +373,7 @@ static bool fsl_ssi_is_i2s_cbm_cfs(struct fsl_ssi *ssi)
SND_SOC_DAIFMT_CBM_CFS;
 }
 
-/**
+/*
  * Interrupt handler to gather states
  */
 static irqreturn_t fsl_ssi_isr(int irq, void *dev_id)
@@ -394,7 +394,7 @@ static irqreturn_t fsl_ssi_isr(int irq, void *dev_id)
return IRQ_HANDLED;
 }
 
-/**
+/*
  * Set SCR, SIER, STCR and SRCR registers with cached values in regvals
  *
  * Notes:
@@ -474,7 +474,7 @@ static void fsl_ssi_config_enable(struct fsl_ssi *ssi, bool 
tx)
ssi->streams |= BIT(dir);
 }
 
-/**
+/*
  * Exclude bits that are used by the opposite stream
  *
  * When both streams are active, disabling some bits for the current stream
@@ -494,7 +494,7 @@ static void fsl_ssi_config_enable(struct fsl_ssi *ssi, bool 
tx)
 #define ssi_excl_shared_bits(vals, avals, aactive) \
((vals) & _ssi_xor_shared_bits(vals, avals, aactive))
 
-/**
+/*
  * Unset SCR, SIER, STCR and SRCR registers with cached values in regvals
  *
  * Notes:
@@ -576,7 +576,7 @@ static void fsl_ssi_tx_ac97_saccst_setup(struct fsl_ssi 
*ssi)
}
 }
 
-/**

[PATCH v2 03/28] ASoC: fsl: fsl-asoc-card: Use correct format when providing struct documentation

[Lee Jones]

Struct kerneldoc headers need to be prefixed with 'struct $NAME', else
the checker gets confused.

Fixes the following W=1 kernel build warning(s):

 sound/soc/fsl/fsl-asoc-card.c:43: warning: cannot understand function 
prototype: 'struct codec_priv '
 sound/soc/fsl/fsl-asoc-card.c:60: warning: cannot understand function 
prototype: 'struct cpu_priv '
 sound/soc/fsl/fsl-asoc-card.c:83: warning: cannot understand function 
prototype: 'struct fsl_asoc_card_priv '
 sound/soc/fsl/fsl-asoc-card.c:104: warning: cannot understand function 
prototype: 'const struct snd_soc_dapm_route audio_map[] = '

Also the size of the struct does not belong in the description:

 sound/soc/fsl/fsl-asoc-card.c:65: warning: Function parameter or member 
'sysclk_freq' not described in 'cpu_priv'
 sound/soc/fsl/fsl-asoc-card.c:65: warning: Function parameter or member 
'sysclk_dir' not described in 'cpu_priv'
 sound/soc/fsl/fsl-asoc-card.c:65: warning: Function parameter or member 
'sysclk_id' not described in 'cpu_priv'
 sound/soc/fsl/fsl-asoc-card.c:95: warning: Function parameter or member 
'dai_link' not described in 'fsl_asoc_card_priv'

Cc: Timur Tabi 
Cc: Nicolin Chen 
Cc: Xiubo Li 
Cc: Fabio Estevam 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones 
---
 sound/soc/fsl/fsl-asoc-card.c | 16 
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c
index 57ea1b072326b..3b1fd8c9316d8 100644
--- a/sound/soc/fsl/fsl-asoc-card.c
+++ b/sound/soc/fsl/fsl-asoc-card.c
@@ -33,7 +33,7 @@
 #define DAI_FMT_BASE (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF)
 
 /**
- * CODEC private data
+ * struct codec_priv - CODEC private data
  *
  * @mclk_freq: Clock rate of MCLK
  * @mclk_id: MCLK (or main clock) id for set_sysclk()
@@ -48,11 +48,11 @@ struct codec_priv {
 };
 
 /**
- * CPU private data
+ * struct cpu_priv - CPU private data
  *
- * @sysclk_freq[2]: SYSCLK rates for set_sysclk()
- * @sysclk_dir[2]: SYSCLK directions for set_sysclk()
- * @sysclk_id[2]: SYSCLK ids for set_sysclk()
+ * @sysclk_freq: SYSCLK rates for set_sysclk()
+ * @sysclk_dir: SYSCLK directions for set_sysclk()
+ * @sysclk_id: SYSCLK ids for set_sysclk()
  * @slot_width: Slot width of each frame
  *
  * Note: [1] for tx and [0] for rx
@@ -65,9 +65,9 @@ struct cpu_priv {
 };
 
 /**
- * Freescale Generic ASOC card private data
+ * struct fsl_asoc_card_priv - Freescale Generic ASOC card private data
  *
- * @dai_link[3]: DAI link structure including normal one and DPCM link
+ * @dai_link: DAI link structure including normal one and DPCM link
  * @pdev: platform device pointer
  * @codec_priv: CODEC private data
  * @cpu_priv: CPU private data
@@ -94,7 +94,7 @@ struct fsl_asoc_card_priv {
char name[32];
 };
 
-/**
+/*
  * This dapm route map exsits for DPCM link only.
  * The other routes shall go through Device Tree.
  *
-- 
2.25.1

[PATCH v2 04/28] ASoC: fsl: fsl_asrc: Demote obvious misuse of kerneldoc to standard comment blocks

[Lee Jones]

No attempt has been made to document any of the demoted functions here.

Fixes the following W=1 kernel build warning(s):

 sound/soc/fsl/fsl_asrc.c:44: warning: cannot understand function prototype: 
'unsigned char input_clk_map_imx35[ASRC_CLK_MAP_LEN] = '
 sound/soc/fsl/fsl_asrc.c:78: warning: cannot understand function prototype: 
'unsigned char clk_map_imx8qm[2][ASRC_CLK_MAP_LEN] = '
 sound/soc/fsl/fsl_asrc.c:118: warning: Function parameter or member 'inrate' 
not described in 'fsl_asrc_sel_proc'
 sound/soc/fsl/fsl_asrc.c:118: warning: Function parameter or member 'outrate' 
not described in 'fsl_asrc_sel_proc'
 sound/soc/fsl/fsl_asrc.c:118: warning: Function parameter or member 'pre_proc' 
not described in 'fsl_asrc_sel_proc'
 sound/soc/fsl/fsl_asrc.c:118: warning: Function parameter or member 
'post_proc' not described in 'fsl_asrc_sel_proc'
 sound/soc/fsl/fsl_asrc.c:158: warning: Function parameter or member 'channels' 
not described in 'fsl_asrc_request_pair'
 sound/soc/fsl/fsl_asrc.c:158: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_request_pair'
 sound/soc/fsl/fsl_asrc.c:201: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_release_pair'
 sound/soc/fsl/fsl_asrc.c:223: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_set_watermarks'
 sound/soc/fsl/fsl_asrc.c:223: warning: Function parameter or member 'in' not 
described in 'fsl_asrc_set_watermarks'
 sound/soc/fsl/fsl_asrc.c:223: warning: Function parameter or member 'out' not 
described in 'fsl_asrc_set_watermarks'
 sound/soc/fsl/fsl_asrc.c:242: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_cal_asrck_divisor'
 sound/soc/fsl/fsl_asrc.c:242: warning: Function parameter or member 'div' not 
described in 'fsl_asrc_cal_asrck_divisor'
 sound/soc/fsl/fsl_asrc.c:259: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_set_ideal_ratio'
 sound/soc/fsl/fsl_asrc.c:259: warning: Function parameter or member 'inrate' 
not described in 'fsl_asrc_set_ideal_ratio'
 sound/soc/fsl/fsl_asrc.c:259: warning: Function parameter or member 'outrate' 
not described in 'fsl_asrc_set_ideal_ratio'
 sound/soc/fsl/fsl_asrc.c:310: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_config_pair'
 sound/soc/fsl/fsl_asrc.c:310: warning: Function parameter or member 
'use_ideal_rate' not described in 'fsl_asrc_config_pair'
 sound/soc/fsl/fsl_asrc.c:516: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_start_pair'
 sound/soc/fsl/fsl_asrc.c:545: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_stop_pair'
 sound/soc/fsl/fsl_asrc.c:559: warning: Function parameter or member 'pair' not 
described in 'fsl_asrc_get_dma_channel'
 sound/soc/fsl/fsl_asrc.c:559: warning: Function parameter or member 'dir' not 
described in 'fsl_asrc_get_dma_channel'
 sound/soc/fsl/fsl_asrc.c:902: warning: Function parameter or member 'asrc' not 
described in 'fsl_asrc_init'
 sound/soc/fsl/fsl_asrc.c:936: warning: Function parameter or member 'irq' not 
described in 'fsl_asrc_isr'
 sound/soc/fsl/fsl_asrc.c:936: warning: Function parameter or member 'dev_id' 
not described in 'fsl_asrc_isr'

Cc: Timur Tabi 
Cc: Nicolin Chen 
Cc: Xiubo Li 
Cc: Fabio Estevam 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones 
---
 sound/soc/fsl/fsl_asrc.c | 28 ++--
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c
index 462ce9f9ab488..209bf80dc3670 100644
--- a/sound/soc/fsl/fsl_asrc.c
+++ b/sound/soc/fsl/fsl_asrc.c
@@ -37,7 +37,7 @@ static struct snd_pcm_hw_constraint_list 
fsl_asrc_rate_constraints = {
.list = supported_asrc_rate,
 };
 
-/**
+/*
  * The following tables map the relationship between asrc_inclk/asrc_outclk in
  * fsl_asrc.h and the registers of ASRCSR
  */
@@ -68,7 +68,7 @@ static unsigned char output_clk_map_imx53[ASRC_CLK_MAP_LEN] = 
{
0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 0x7, 
0x7, 0x7,
 };
 
-/**
+/*
  * i.MX8QM/i.MX8QXP uses the same map for input and output.
  * clk_map_imx8qm[0] is for i.MX8QM asrc0
  * clk_map_imx8qm[1] is for i.MX8QM asrc1
@@ -101,7 +101,7 @@ static unsigned char clk_map_imx8qxp[2][ASRC_CLK_MAP_LEN] = 
{
},
 };
 
-/**
+/*
  * Select the pre-processing and post-processing options
  * Make sure to exclude following unsupported cases before
  * calling this function:
@@ -147,7 +147,7 @@ static void fsl_asrc_sel_proc(int inrate, int outrate,
*post_proc = 1;
 }
 
-/**
+/*
  * Request ASRC pair
  *
  * It assigns pair by the order of A->C->B because allocation of pair B,
@@ -192,7 +192,7 @@ static int fsl_asrc_request_pair(int channels, struct 
fsl_asrc_pair *pair)
return ret;
 }
 
-/**
+/*
  * Release ASRC pair
  *
  * It clears the resource from asrc and releases the occupied channels.
@@ -216,7 +216,7 @@ static void fsl_asrc_rel

Re: [PATCH v2] MAINTAINERS: Add Shengjiu to reviewer list of sound/soc/fsl

[Mark Brown]

On Mon, 6 Jul 2020 21:58:29 -0700, Nicolin Chen wrote:
> Add Shengjiu who's actively working on the latest fsl/nxp audio drivers.

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] MAINTAINERS: Add Shengjiu to reviewer list of sound/soc/fsl
  commit: 503ed52225ed3d369c8e0dedf13556a7bc1e5c2b

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

Re: [PATCH] MAINTAINERS: Add Shengjiu to reviewer list of sound/soc/fsl

[Mark Brown]

On Thu, 2 Jul 2020 12:31:02 -0700, Nicolin Chen wrote:
> Add Shengjiu who's actively working on the latest fsl/nxp audio drivers.

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] MAINTAINERS: Add Shengjiu to reviewer list of sound/soc/fsl
  commit: 503ed52225ed3d369c8e0dedf13556a7bc1e5c2b

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

Re: [PATCH] ASoC: fsl: mpc8610_hpcd: Add missing of_node_put()

[Mark Brown]

On Tue, 7 Jul 2020 19:47:47 +0800, Yi Wang wrote:
> After finishing using device node got from of_find_compatible_node(),
> of_node_put() needs to be called.

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: fsl: mpc8610_hpcd: Add missing of_node_put()
  commit: a5911ac5790acaf98c929b826b3f7b4a438f9759

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

[PATCH v2] powerpc/numa: Restrict possible nodes based on platform

[Srikar Dronamraju]

As per PAPR, there are 2 device tree property
ibm,max-associativity-domains (which defines the maximum number of
domains that the firmware i.e PowerVM can support) and
ibm,current-associativity-domains (which defines the maximum number of
domains that the platform can support). Value of
ibm,max-associativity-domains property is always greater than or equal
to ibm,current-associativity-domains property.

Powerpc currently uses ibm,max-associativity-domains  property while
setting the possible number of nodes. This is currently set at 32.
However the possible number of nodes for a platform may be significantly
less. Hence set the possible number of nodes based on
ibm,current-associativity-domains property.

$ lsprop /proc/device-tree/rtas/ibm,*associ*-domains
/proc/device-tree/rtas/ibm,current-associativity-domains
 0005 0001 0002 0002 0002 0010
/proc/device-tree/rtas/ibm,max-associativity-domains
 0005 0001 0008 0020 0020 0100

$ cat /sys/devices/system/node/possible ##Before patch
0-31

$ cat /sys/devices/system/node/possible ##After patch
0-1

Note the maximum nodes this platform can support is only 2 but the
possible nodes is set to 32.

This is important because lot of kernel and user space code allocate
structures for all possible nodes leading to a lot of memory that is
allocated but not used.

I ran a simple experiment to create and destroy 100 memory cgroups on
boot on a 8 node machine (Power8 Alpine).

Before patch
free -k at boot
  totalusedfree  shared  buff/cache   available
Mem:  523498176 4106816   518820608   22272  570752   516606720
Swap:   4194240   0 4194240

free -k after creating 100 memory cgroups
  totalusedfree  shared  buff/cache   available
Mem:  523498176 4628416   518246464   22336  623296   516058688
Swap:   4194240   0 4194240

free -k after destroying 100 memory cgroups
  totalusedfree  shared  buff/cache   available
Mem:  523498176 4697408   518173760   22400  627008   515987904
Swap:   4194240   0 4194240

After patch
free -k at boot
  totalusedfree  shared  buff/cache   available
Mem:  523498176 3969472   518933888   22272  594816   516731776
Swap:   4194240   0 4194240

free -k after creating 100 memory cgroups
  totalusedfree  shared  buff/cache   available
Mem:  523498176 4181888   518676096   22208  640192   516496448
Swap:   4194240   0 4194240

free -k after destroying 100 memory cgroups
  totalusedfree  shared  buff/cache   available
Mem:  523498176 4232320   518619904   22272  645952   516443264
Swap:   4194240   0 4194240

Observations:
Fixed kernel takes 137344 kb (4106816-3969472) less to boot.
Fixed kernel takes 309184 kb (4628416-4181888-137344) less to create 100 memcgs.

Cc: Nathan Lynch 
Cc: Michael Ellerman 
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Anton Blanchard 
Cc: Bharata B Rao 
Cc: Tyrel Datwyler 
Signed-off-by: Srikar Dronamraju 
---
v1: 
https://lore.kernel.org/linuxppc-dev/20200706064002.14848-1-sri...@linux.vnet.ibm.com/t/#u
Changelog v1->v2:
Fallback to ibm,max-associativity-domains if ibm,current-associativity
is not available. Suggested by Tyrel Datwyler.

 arch/powerpc/mm/numa.c | 15 ---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 9fcf2d195830..fc7b0505bdd8 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -896,10 +896,19 @@ static void __init find_possible_nodes(void)
if (!rtas)
return;
 
-   if (of_property_read_u32_index(rtas,
-   "ibm,max-associativity-domains",
+   if (of_property_read_u32_index(rtas, 
"ibm,current-associativity-domains",
+   min_common_depth, &numnodes)) {
+   /*
+* ibm,current-associativity-domains is a fairly recent
+* property. If it doesn't exist, then fallback on
+* ibm,max-associativity-domains. Current denotes what the
+* platform can support compared to max which denotes what the
+* Hypervisor can support.
+*/
+   if (of_property_read_u32_index(rtas, 
"ibm,max-associativity-domains",
min_common_depth, &numnodes))
-   goto out;
+   goto out;
+   }
 
for (i = 0; i < numnodes; i++) {
if (!node_possible(i))
-- 
2.18.2

Re: kernel since 5.6 do not boot anymore on Apple PowerBook

[Giuseppe Sacco]

Hello Cristophe,

Il giorno mar, 07/07/2020 alle 15.35 +0200, Christophe Leroy ha
scritto:
> Hi,
> Le 07/07/2020 à 14:58, Giuseppe Sacco a écrit :
[...]
> > So, I am looking for help. How may I better investigate the
> > problem?
> > How may I crossbuild the kernel on a faster machine (amd64) in
> > order to
> > try git-bisect without waiting ages?
> 
> To crossbuild, use cross tools at 
> https://mirrors.edge.kernel.org/pub/tools/crosstool/

thank you, I'll have a look at it.

> Can you tell which defconfig you use or provide your .config

You may get the standard one from debian or a reduced one that I made
on purpose. The latter is here:
https://eppesuigoccas.homedns.org/~giuseppe/config-5.4.50.gz (boot)
https://eppesuigoccas.homedns.org/~giuseppe/config-5.6.19.gz (no boot)

Bye,
Giuseppe

Re: kernel since 5.6 do not boot anymore on Apple PowerBook

[Christophe Leroy]

Hi,

Le 07/07/2020 à 14:58, Giuseppe Sacco a écrit :

Hello,
I am testing linux on a quite old hardware, an Apple PowerBook G4
"Titanium IV". I used to run Debian on this machine, so I upgraded the
old operating system to the latest software and found that new kernels
do not boot.
I rebuilt natively (on the powerbook) a few kernels and found that
5.4.50 still works fine, while 5.6.19 and 5.7.7 stop after printing:

pmac32_cpufreq: registering PowerMac CPU frequency driver
pmac32_cpufreq: Low: 667 MHz, High: 867 Mhz, Boot: 667 MHz

no more output is printed. I waited 5 minutes and then powered off the
machine using the power button. Rebooting with old kernel works.

So, I am looking for help. How may I better investigate the problem?
How may I crossbuild the kernel on a faster machine (amd64) in order to
try git-bisect without waiting ages?



To crossbuild, use cross tools at 
https://mirrors.edge.kernel.org/pub/tools/crosstool/


Can you tell which defconfig you use or provide your .config

Christophe

kernel since 5.6 do not boot anymore on Apple PowerBook

[Giuseppe Sacco]

Hello,
I am testing linux on a quite old hardware, an Apple PowerBook G4
"Titanium IV". I used to run Debian on this machine, so I upgraded the
old operating system to the latest software and found that new kernels
do not boot.
I rebuilt natively (on the powerbook) a few kernels and found that
5.4.50 still works fine, while 5.6.19 and 5.7.7 stop after printing:

pmac32_cpufreq: registering PowerMac CPU frequency driver
pmac32_cpufreq: Low: 667 MHz, High: 867 Mhz, Boot: 667 MHz

no more output is printed. I waited 5 minutes and then powered off the
machine using the power button. Rebooting with old kernel works.

So, I am looking for help. How may I better investigate the problem?
How may I crossbuild the kernel on a faster machine (amd64) in order to
try git-bisect without waiting ages?

Thank you,
Giuseppe

Re: [PATCH v2] powerpc/uaccess: Use flexible addressing with __put_user()/__get_user()

[Christophe Leroy]

Le 30/06/2020 à 03:19, Michael Ellerman a écrit :

Michael Ellerman  writes:

Christophe Leroy  writes:

Hi Michael,

I see this patch is marked as "defered" in patchwork, but I can't see
any related discussion. Is it normal ?


Because it uses the "m<>" constraint which didn't work on GCC 4.6.

https://github.com/linuxppc/issues/issues/297

So we should be able to pick it up for v5.9 hopefully.


It seems to break the build with the kernel.org 4.9.4 compiler and
corenet64_smp_defconfig:


Most likely a GCC bug ?

It seems the problem vanishes with patch 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/173de3b659fa3a5f126a0eb170522cccd909950f.1594125164.git.christophe.le...@csgroup.eu/ 



Christophe

[PATCH 1/2] powerpc/signal_32: Remove !FULL_REGS() special handling in PPC64 save_general_regs()

[Christophe Leroy]

Since commit ("1bd79336a426 powerpc: Fix various
syscall/signal/swapcontext bugs"), getting save_general_regs() called
without FULL_REGS() is very unlikely and generates a warning.

The 32-bit version of save_general_regs() doesn't take care of it
at all and copies all registers anyway since that commit.

Moreover, commit 965dd3ad3076 ("powerpc/64/syscall: Remove
non-volatile GPR save optimisation") is another reason why it would
never happen.

So the same with 64-bit, don't worry about FULL_REGS() and copy
all registers all the time.

Signed-off-by: Christophe Leroy 
---
 arch/powerpc/kernel/signal_32.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 1415c16ab628..0fd59fbc6d49 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -109,8 +109,6 @@ static inline int save_general_regs(struct pt_regs *regs,
WARN_ON(!FULL_REGS(regs));
 
for (i = 0; i <= PT_RESULT; i ++) {
-   if (i == 14 && !FULL_REGS(regs))
-   i = 32;
if ( i == PT_SOFTE) {
if(__put_user((unsigned int)softe, &frame->mc_gregs[i]))
return -EFAULT;
-- 
2.25.0

[PATCH 2/2] powerpc/signal_32: Simplify loop in PPC64 save_general_regs()

[Christophe Leroy]

save_general_regs() which does special handling when i == PT_SOFTE.

Rewrite it to minimise the specific part, especially the __put_user()
and associated error handling is the same so make it common.

Signed-off-by: Christophe Leroy 
---
 arch/powerpc/kernel/signal_32.c | 13 -
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 0fd59fbc6d49..aae31fa5e411 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -103,19 +103,14 @@ static inline int save_general_regs(struct pt_regs *regs,
 {
elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
int i;
-   /* Force usr to alway see softe as 1 (interrupts enabled) */
-   elf_greg_t64 softe = 0x1;
 
WARN_ON(!FULL_REGS(regs));
 
for (i = 0; i <= PT_RESULT; i ++) {
-   if ( i == PT_SOFTE) {
-   if(__put_user((unsigned int)softe, &frame->mc_gregs[i]))
-   return -EFAULT;
-   else
-   continue;
-   }
-   if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
+   /* Force usr to alway see softe as 1 (interrupts enabled) */
+   int val = (i == PT_SOFTE) ? 1 : gregs[i];
+
+   if (__put_user(val, &frame->mc_gregs[i]))
return -EFAULT;
}
return 0;
-- 
2.25.0

[Bug 208197] OF: /pci@f2000000/mac-io@17/gpio@50/...: could not find phandle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=208197

--- Comment #6 from Erhard F. (erhar...@mailbox.org) ---
Also I took some time to revert individual commits from the bisect.log:

388bcc6ecc609fca1b4920de7dc3806c98ec535e drivers: base: Fix NULL pointer
exception in __platform_driver_probe() if a driver developer is foolish
48ebea5026d692c5ab0a7d303f0fe1f8ba046e0f firmware_loader: move
fw_fallback_config to a private kernel symbol namespace
c78c31b374a68be79cb4a03ef5b6c187f034e903 Revert "Revert "driver core: Set
fw_devlink to "permissive" behavior by default""
c8be6af9ef16cf44d690fc227a0d2dd7a526ef05 Merge v5.7-rc5 into driver-core-next
eb7fbc9fb1185a7f89adeb2de724c2c96ff608e9 driver core: Add missing '\n' in log
messages
42926ac3cd50937346c23c0005817264af4357a7 driver core: Move code to the right
part of the file
baf1d9c182935e88aab08701b0a0b22871117fe0 driver/base/soc: Use kobj_to_dev() API
5f5377eaddfc24e5d7562e588d0ff84f9264d7c1 driver core: Look for waiting
consumers only for a fwnode's primary device
96fa72ffb2155dba9ba8c5d282a1ff19ed32f177 Merge 5.7-rc3 into driver-core-next
716a7a25969003d82ab738179c3f1068a120ed11 driver core: fw_devlink: Add support
for batching fwnode parsing
fbc35b45f9f6a971341b9462c6e94c257e779fb5 Add documentation on meaning of
-EPROBE_DEFER
45bb08de65b418959313593f527c619e102c2d57 driver core: platform: remove
redundant assignment to variable ret
93d2e4322aa74c1ad1e8c2160608eb9a960d69ff of: platform: Batch fwnode parsing
when adding all top level devices
69b07ee33eb12a505d55e3e716fc7452496b9041 debugfs: Use the correct style for
SPDX License Identifier
fefcfc968723caf93318613a08e1f3ad07a6154f driver core: Remove check in
driver_deferred_probe_force_trigger()
0f605db5bdd42edfbfcac36acaf8f72cfe9ce774 kernfs: Change kernfs_node lockdep
name to "kn->active"
c82c83c330654c5639960ebc3dabbae53c43f79e driver core: platform: Fix spelling
errors in platform.c
114dbb4fa7c4053a51964d112e2851e818e085c6 drivers property: When no children in
primary, try secondary
55623260bb33e2ab849af76edf2253bc04cb241f test_firmware: remove unnecessary
test_fw_mutex in test_dev_config_show_xxx
2cd38fd15e4ebcfe917a443734820269f8b5ba2b driver core: Remove unnecessary
is_fwnode_dev variable in device_add()
ab7c1e163b525316a870a494dd4ea196e7a6c455 firmware: Drop unused pages field from
struct firmware
f7d8f3f092d001f8d91552d2697643e727694942 Merge 5.7-rc7 into driver-core-next


Reverting Merge 5.7-rc7 into driver-core-next via:
git revert f7d8f3f092d001f8d91552d2697643e727694942 -m2

while leaving the other commits still in made the "could not find phandle"
disappear. I guess the relevant commit is somewhere in this merge.

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[Bug 208197] OF: /pci@f2000000/mac-io@17/gpio@50/...: could not find phandle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=208197

--- Comment #5 from Erhard F. (erhar...@mailbox.org) ---
(In reply to Michael Ellerman from comment #3)
> Try this?
See new dmesg.

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[Bug 208197] OF: /pci@f2000000/mac-io@17/gpio@50/...: could not find phandle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=208197

--- Comment #4 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 290157
  --> https://bugzilla.kernel.org/attachment.cgi?id=290157&action=edit
dmesg (5.8-rc4 + WARN_ON patch, PowerMac G4 DP)

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Re: [PATCH] powerpc: select ARCH_HAS_MEMBARRIER_SYNC_CORE

[Christophe Leroy]

Le 07/07/2020 à 13:25, Mathieu Desnoyers a écrit :

- On Jul 7, 2020, at 1:50 AM, Nicholas Piggin npig...@gmail.com wrote:


Excerpts from Christophe Leroy's message of July 6, 2020 7:53 pm:



Le 06/07/2020 à 04:18, Nicholas Piggin a écrit :

diff --git a/arch/powerpc/include/asm/exception-64s.h
b/arch/powerpc/include/asm/exception-64s.h
index 47bd4ea0837d..b88cb3a989b6 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -68,6 +68,10 @@
*
* The nop instructions allow us to insert one or more instructions to flush 
the
* L1-D cache when returning to userspace or a guest.
+ *
+ * powerpc relies on return from interrupt/syscall being context synchronising
+ * (which hrfid, rfid, and rfscv are) to support ARCH_HAS_MEMBARRIER_SYNC_CORE
+ * without additional additional synchronisation instructions.


This file is dedicated to BOOK3S/64. What about other ones ?

On 32 bits, this is also valid as 'rfi' is also context synchronising,
but then why just add some comment in exception-64s.h and only there ?


Yeah you're right, I basically wanted to keep a note there just in case,
because it's possible we would get a less synchronising return (maybe
unlikely with meltdown) or even return from a kernel interrupt using a
something faster (e.g., bctar if we don't use tar register in the kernel
anywhere).

So I wonder where to add the note, entry_32.S and 64e.h as well?



For 64-bit powerpc, I would be tempted to either place the comment in the header
implementing the RFI_TO_USER and RFI_TO_USER_OR_KERNEL macros or the .S files
using them, e.g. either:

arch/powerpc/include/asm/exception-64e.h
arch/powerpc/include/asm/exception-64s.h

or

arch/powerpc/kernel/exceptions-64s.S
arch/powerpc/kernel/entry_64.S

And for 32-bit powerpc, AFAIU

arch/powerpc/kernel/entry_32.S

uses SYNC + RFI to return to user-space. RFI is defined in

arch/powerpc/include/asm/ppc_asm.h

So a comment either near the RFI define and its uses should work.




For 32-bit, RFI is likely to go away the day 40x goes away, so I 
wouldn't put it there.

Places like head_8xx.S use rfi not RFI.

And the SYNC is about to go when we decide to retire 601 SYNC FIX.

So it would be probably better to put it somewhere in entry_32.S

Christophe

[PATCH] ASoC: fsl: mpc8610_hpcd: Add missing of_node_put()

[Yi Wang]

From: Liao Pingfang 

After finishing using device node got from of_find_compatible_node(),
of_node_put() needs to be called.

Signed-off-by: Liao Pingfang 
---
 sound/soc/fsl/mpc8610_hpcd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/fsl/mpc8610_hpcd.c b/sound/soc/fsl/mpc8610_hpcd.c
index f7bd900..b3090fe 100644
--- a/sound/soc/fsl/mpc8610_hpcd.c
+++ b/sound/soc/fsl/mpc8610_hpcd.c
@@ -426,9 +426,11 @@ static int __init mpc8610_hpcd_init(void)
guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
if (of_address_to_resource(guts_np, 0, &res)) {
pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
+   of_node_put(guts_np);
return -EINVAL;
}
guts_phys = res.start;
+   of_node_put(guts_np);
 
return platform_driver_register(&mpc8610_hpcd_driver);
 }
-- 
2.9.5

Re: [PATCH 0/5] cpuidle-pseries: Parse extended CEDE information for idle.

[Gautham R Shenoy]

Hi,

On Tue, Jul 07, 2020 at 04:41:34PM +0530, Gautham R. Shenoy wrote:
> From: "Gautham R. Shenoy" 
> 
> Hi,
> 
> 
> 
> 
> Gautham R. Shenoy (5):
>   cpuidle-pseries: Set the latency-hint before entering CEDE
>   cpuidle-pseries: Add function to parse extended CEDE records
>   cpuidle-pseries : Fixup exit latency for CEDE(0)
>   cpuidle-pseries : Include extended CEDE states in cpuidle framework
>   cpuidle-pseries: Block Extended CEDE(1) which adds no additional
> value.

Forgot to mention that these patches are on top of Nathan's series to
remove extended CEDE offline and bogus topology update code :
https://lore.kernel.org/linuxppc-dev/20200612051238.1007764-1-nath...@linux.ibm.com/

> 
>  drivers/cpuidle/cpuidle-pseries.c | 268 
> +-
>  1 file changed, 266 insertions(+), 2 deletions(-)
> 
> -- 
> 1.9.4
>