On 21/2/20 2:26 pm, Alastair D'Silva wrote:
From: Alastair D'Silva
When setting up OpenCAPI connected persistent memory, the range check may
not be performed until quite late (or perhaps not at all, if the user does
not establish a DAX device).
This patch makes the range check callable so we
The hv_24×7 feature in IBM® POWER9™ processor-based servers provide the
facility to continuously collect large numbers of hardware performance
metrics efficiently and accurately.
This patch adds hv_24x7 metric file for different Socket/chip
resources.
Result:
power9 platform:
command:# ./perf
Commit 54b5091606c18 ("perf stat: Implement --metric-only mode")
added function 'valid_only_metric()' which drops "Hz" or "hz",
if it is part of "ScaleUnit". This patch enable it since hv_24x7
supports couple of frequency events.
Signed-off-by: Kajol Jain
---
tools/perf/util/stat-display.c | 2
Patch enhances current metric infrastructure to handle "?" in the metric
expression. The "?" can be use for parameters whose value not known while
creating metric events and which can be replace later at runtime to
the proper value. It also add flexibility to create multiple events out
of single
Function 'read_sys_info_pseries()' is added to get system parameter
values like number of sockets and chips per socket.
and it gets these details via rtas_call with token
"PROCESSOR_MODULE_INFO".
Incase lpar migrate from one system to another, system
parameter details like chips per sockets or
Add documentation for the following sysfs files:
/sys/devices/hv_24x7/interface/chips,
/sys/devices/hv_24x7/interface/sockets
Signed-off-by: Kajol Jain
---
.../testing/sysfs-bus-event_source-devices-hv_24x7 | 14 ++
1 file changed, 14 insertions(+)
diff --git
To expose the system dependent parameter like total number of
sockets and numbers of chips per socket, patch adds two sysfs files.
"sockets" and "chips" are added to /sys/devices/hv_24x7/interface/
of the "hv_24x7" pmu.
Signed-off-by: Kajol Jain
---
arch/powerpc/perf/hv-24x7.c | 22
For hv_24x7 socket/chip level events, specific chip-id to which
the data requested should be added as part of pmu events.
But number of chips/socket in the system details are not exposed.
Patch implements read_sys_info_pseries() to get system
parameter values like number of sockets and chips per
Commit 2b206ee6b0df ("powerpc/perf/hv-24x7: Display change in counter
values")' added to print _change_ in the counter value rather then raw
value for 24x7 counters. Incase of transactions, the event count
is set to 0 at the beginning of the transaction. It also sets
the event's prev_count to the
The hv_24×7 feature in IBM® POWER9™ processor-based servers provide the
facility to continuously collect large numbers of hardware performance
metrics efficiently and accurately.
First patch of the patchset fix inconsistent results we are getting when
we run multiple 24x7 events.
Patchset adds
On 21/2/20 2:26 pm, Alastair D'Silva wrote:
From: Alastair D'Silva
Function declarations don't need externs, remove the existing ones
so they are consistent with newer code
Signed-off-by: Alastair D'Silva
Acked-by: Andrew Donnellan
--
Andrew Donnellan OzLabs, ADL Canberra
On 21/2/20 2:27 pm, Alastair D'Silva wrote:
From: Alastair D'Silva
The OpenCAPI Persistent Memory driver will be maintained as part ofi
the ppc tree.
I'm also adding myself as an author of the driver & contributor to
the generic ocxl driver.
Signed-off-by: Alastair D'Silva
You need to
From: "Gautham R. Shenoy"
Add documentation for the following sysfs interfaces:
/sys/devices/system/cpu/cpuX/purr
/sys/devices/system/cpu/cpuX/spurr
/sys/devices/system/cpu/cpuX/idle_purr
/sys/devices/system/cpu/cpuX/idle_spurr
Signed-off-by: Gautham R. Shenoy
---
From: "Gautham R. Shenoy"
On Pseries LPARs, to calculate utilization, we need to know the
[S]PURR ticks when the CPUs were busy or idle.
Via idle_loop_prolog(), idle_loop_epilog(), we track the idle PURR
ticks in the VPA variable "wait_state_cycles". This patch extends the
support to account
From: "Gautham R. Shenoy"
Hi,
This is the second version of the patches to track and expose idle
PURR and SPURR ticks. These patches are required by tools such as
lparstat to compute system utilization for capacity planning purposes.
v1 can be found here:
From: "Gautham R. Shenoy"
On Pseries LPARs, to calculate utilization, we need to know the
[S]PURR ticks when the CPUs were busy or idle.
The total PURR and SPURR ticks are already exposed via the per-cpu
sysfs files "purr" and "spurr". This patch adds support for exposing
the idle PURR and
From: "Gautham R. Shenoy"
Currently prior to entering an idle state on a Linux Guest, the
pseries cpuidle driver implement an idle_loop_prolog() and
idle_loop_epilog() functions which ensure that idle_purr is correctly
computed, and the hypervisor is informed that the CPU cycles have been
From: "Gautham R. Shenoy"
Currently when CPU goes idle, we take a snapshot of PURR via
idle_loop_prolog() which is used at the CPU idle exit to compute the
idle PURR cycles via the function idle_loop_epilog(). Thus, the value
of idle PURR cycle thus read before idle_loop_prolog() and after
From: Alastair D'Silva
This patch adds platform support to map & release LPC memory.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/include/asm/pnv-ocxl.h | 4 +++
arch/powerpc/platforms/powernv/ocxl.c | 43 +++
2 files changed, 47 insertions(+)
diff --git
From: Alastair D'Silva
Function declarations don't need externs, remove the existing ones
so they are consistent with newer code
Signed-off-by: Alastair D'Silva
---
arch/powerpc/include/asm/pnv-ocxl.h | 32 ++---
include/misc/ocxl.h | 6 +++---
2 files
From: Alastair D'Silva
This patch introduces a character device (/dev/ocxl-scmX) which further
patches will use to interact with userspace.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/ocxl.c| 116 +-
.../platforms/powernv/pmem/ocxl_internal.h
From: Alastair D'Silva
These values have been taken from the device specifications.
Signed-off-by: Alastair D'Silva
---
.../platforms/powernv/pmem/ocxl_internal.h| 72 +++
1 file changed, 72 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
From: Alastair D'Silva
When health & performance data is requested from the controller,
it responds with an error log containing the requested information.
This patch allows the request to me issued via an IOCTL.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/ocxl.c
From: Alastair D'Silva
The controller can report a number of statistics that are useful
in evaluating the performance and reliability of the card.
This patch exposes this information via an IOCTL.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/ocxl.c | 185
From: Alastair D'Silva
The heartbeat admin command is a simple admin command that exercises
the communication mechanisms within the controller.
This patch issues a heartbeat command to the card during init to ensure
we can communicate with the card's controller.
Signed-off-by: Alastair D'Silva
From: Alastair D'Silva
This information will be used by ndctl in userspace to help users identify
the device.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/Makefile | 2 +-
arch/powerpc/platforms/powernv/pmem/ocxl.c| 5 +++
From: Alastair D'Silva
These IOCTLs provide low level access to the card to aid in debugging
controller/FPGA firmware.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/Kconfig | 6 +
arch/powerpc/platforms/powernv/pmem/ocxl.c | 249
From: Alastair D'Silva
Some of the interrupts that the card generates are better handled
by the userspace daemon, in particular:
Controller Hardware/Firmware Fatal
Controller Dump Available
Error Log available
This patch allows a userspace application to register an eventfd with
the driver via
From: Alastair D'Silva
This driver exposes LPC memory on OpenCAPI pmem cards
as an NVDIMM, allowing the existing nvram infrastructure
to be used.
Namespace metadata is stored on the media itself, so
scm_reserve_metadata() maps 1 section's worth of PMEM storage
at the start to hold this. The
From: Alastair D'Silva
The read error log command extracts information from the controller's
internal error log.
This patch exposes this information in 2 ways:
- During probe, if an error occurs & a log is available, print it to the
console
- After probe, make the error log available to
From: Alastair D'Silva
This patch emits a message showing how much LPC memory & special purpose
memory was detected on an OCXL device.
Signed-off-by: Alastair D'Silva
---
drivers/misc/ocxl/config.c | 4
1 file changed, 4 insertions(+)
diff --git a/drivers/misc/ocxl/config.c
From: Alastair D'Silva
The OpenCAPI Persistent Memory driver will be maintained as part ofi
the ppc tree.
I'm also adding myself as an author of the driver & contributor to
the generic ocxl driver.
Signed-off-by: Alastair D'Silva
---
MAINTAINERS | 3 +++
1 file changed, 3 insertions(+)
diff
From: Alastair D'Silva
This patch requests the metadata required to issue admin commands, as well
as some helper functions to construct and check the completion of the
commands.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/ocxl.c| 65
From: Alastair D'Silva
Similar to the previous patch, this adds support for near storage commands.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/ocxl.c| 6 +++
.../platforms/powernv/pmem/ocxl_internal.c| 41 +++
From: Alastair D'Silva
This patch adds IOCTLs to allow userspace to request & fetch dumps
of the internal controller state.
This is useful during debugging or when a fatal error on the controller
has occurred.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/ocxl.c |
From: Alastair D'Silva
This patch enables the OpenCAPI Persistent Memory driver, as well
as DAX support, for the 'powernv' platform.
DAX is not a strict requirement for the functioning of the driver, but it
is likely that a user will want to create a DAX device on top of their
persistent memory
From: Alastair D'Silva
This patch retrieves proprietary formatted SMART data and makes it
available via ndctl. A later contribution will be made to ndctl to
parse this data.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/ocxl.c| 128 ++
From: Alastair D'Silva
This patch reads timeouts & firmware version from the controller, and
uses those timeouts to wait for the controller to report that it is ready
before handing the memory over to libnvdimm.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/Makefile
From: Alastair D'Silva
This patch addresses warnings and errors from the kernel doc scripts for
the OpenCAPI driver.
It also makes minor tweaks to make the docs more consistent.
Signed-off-by: Alastair D'Silva
---
drivers/misc/ocxl/config.c| 24
From: Alastair D'Silva
This information will be used by ndctl in userspace to help users identify
the device.
Signed-off-by: Alastair D'Silva
---
arch/powerpc/platforms/powernv/pmem/ocxl_sysfs.c | 9 +
1 file changed, 9 insertions(+)
diff --git
From: Alastair D'Silva
Add functions to map/unmap LPC memory
Signed-off-by: Alastair D'Silva
---
drivers/misc/ocxl/core.c | 51 +++
drivers/misc/ocxl/ocxl_internal.h | 3 ++
include/misc/ocxl.h | 21 +
3 files changed, 75
From: Alastair D'Silva
This patch retrieves the serial number of the card and makes it available
to consumers of the ocxl driver via the ocxl_fn struct.
Signed-off-by: Alastair D'Silva
Acked-by: Frederic Barrat
Acked-by: Andrew Donnellan
---
drivers/misc/ocxl/config.c | 46
From: Alastair D'Silva
Tally up the LPC memory on an OpenCAPI link & allow it to be mapped
Signed-off-by: Alastair D'Silva
---
drivers/misc/ocxl/core.c | 10 ++
drivers/misc/ocxl/link.c | 53 +++
drivers/misc/ocxl/ocxl_internal.h | 33
From: Alastair D'Silva
This series adds support for OpenCAPI Persistent Memory devices, exposing
them as nvdimms so that we can make use of the existing infrastructure.
Alastair D'Silva (27):
powerpc: Add OPAL calls for LPC memory alloc/release
mm/memory_hotplug: Allow
From: Alastair D'Silva
Add OPAL calls for LPC memory alloc/release
Signed-off-by: Alastair D'Silva
Acked-by: Andrew Donnellan
Acked-by: Frederic Barrat
---
arch/powerpc/include/asm/opal-api.h| 2 ++
arch/powerpc/include/asm/opal.h| 3 +++
From: Alastair D'Silva
When setting up OpenCAPI connected persistent memory, the range check may
not be performed until quite late (or perhaps not at all, if the user does
not establish a DAX device).
This patch makes the range check callable so we can perform the check while
probing the
Hi all,
On Thu, 16 Jan 2020 11:37:14 +1100 Stephen Rothwell
wrote:
>
> On Wed, 15 Jan 2020 14:01:35 -0600 Scott Wood wrote:
> >
> > On Thu, 2020-01-16 at 06:42 +1100, Stephen Rothwell wrote:
> > > Hi Timur,
> > >
> > > On Wed, 15 Jan 2020 07:25:45 -0600 Timur Tabi wrote:
> > >
> > > >
On Thu, Feb 06, 2020 at 08:11:39AM +, Christophe Leroy wrote:
> Commit 46d1a0f03d66 ("selftests/lkdtm: Add tests for LKDTM targets")
> added generation of lkdtm test scripts.
>
> Ignore those generated scripts when performing 'git status'
>
> Fixes: 46d1a0f03d66 ("selftests/lkdtm: Add tests
On Tue, 18 Feb 2020 18:36:50 +1100
Alexey Kardashevskiy wrote:
> So far the only option for a big 64big DMA window was a window located
> at 0x800... (1<<59) which creates problems for devices
> supporting smaller DMA masks.
>
> This exploits a POWER9 PHB option to allow the second
On Tue, 2020-02-11 at 01:28 -0300, Leonardo Bras wrote:
> Looks a valid change.
> rlwimi r10, r10, 0, 0x0f00 means:
> r10 = ((r10 << 0) & 0x0f00) | (r10 & ~0x0f00) which ends up being
> r10 = r10
>
> On ISA, rlwinm is recommended for clearing high order bits.
> rlwinm r10, r10, 0, ~0x0f00
Hi Leonardo,
Thanks a lot for the review.
On 02/20/2020 02:51 PM, Leonardo Bras wrote:
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
Could not see where is this used.
This is used by pr_warn_ratelimited() below so the module name is printed before
the message, for instance:
On 2/20/20 7:58 AM, Christophe Leroy wrote:
ping
On 02/06/2020 08:11 AM, Christophe Leroy wrote:
Commit 46d1a0f03d66 ("selftests/lkdtm: Add tests for LKDTM targets")
added generation of lkdtm test scripts.
Ignore those generated scripts when performing 'git status'
Fixes: 46d1a0f03d66
pariscallnoconfig
parisc allyesconfig
pariscgeneric-32bit_defconfig
pariscgeneric-64bit_defconfig
x86_64 randconfig-a001-20200220
x86_64 randconfig-a002-20200220
x86_64
Hello Gustavo, comments inline:
On Tue, 2020-02-18 at 16:13 -0500, Gustavo Romero wrote:
> diff --git a/arch/powerpc/kvm/book3s_hv_tm.c b/arch/powerpc/kvm/book3s_hv_tm.c
> index 0db937497169..cc90b8b82329 100644
> --- a/arch/powerpc/kvm/book3s_hv_tm.c
> +++ b/arch/powerpc/kvm/book3s_hv_tm.c
> @@
Le 20/02/2020 à 18:34, Radu Rendec a écrit :
On 02/20/2020 at 11:25 AM Christophe Leroy wrote:
Le 20/02/2020 à 17:02, Radu Rendec a écrit :
On 02/20/2020 at 3:38 AM Christophe Leroy wrote:
On 02/19/2020 10:39 PM, Radu Rendec wrote:
On 02/19/2020 at 4:21 PM Christophe Leroy wrote:
On 02/20/2020 at 11:25 AM Christophe Leroy wrote:
> Le 20/02/2020 à 17:02, Radu Rendec a écrit :
> > On 02/20/2020 at 3:38 AM Christophe Leroy wrote:
> >> On 02/19/2020 10:39 PM, Radu Rendec wrote:
> >>> On 02/19/2020 at 4:21 PM Christophe Leroy wrote:
> > Interesting.
> >
> > 0x900
Le 20/02/2020 à 17:02, Radu Rendec a écrit :
On 02/20/2020 at 3:38 AM Christophe Leroy wrote:
On 02/19/2020 10:39 PM, Radu Rendec wrote:
On 02/19/2020 at 4:21 PM Christophe Leroy wrote:
Interesting.
0x900 is the adress of the timer interrupt.
Would the MCE occur just after the timer
On Mon, Feb 17, 2020 at 09:49:41AM +0100, Frederic Barrat wrote:
Le 14/02/2020 à 16:41, Sasha Levin a écrit :
From: Frederic Barrat
[ Upstream commit 05dd7da76986937fb288b4213b1fa10dbe0d1b33 ]
Hi,
Upstream commit 05dd7da76986937fb288b4213b1fa10dbe0d1b33 doesn't
really need to go to
On 02/20/2020 at 3:38 AM Christophe Leroy wrote:
> On 02/19/2020 10:39 PM, Radu Rendec wrote:
> > On 02/19/2020 at 4:21 PM Christophe Leroy wrote:
> >>> Interesting.
> >>>
> >>> 0x900 is the adress of the timer interrupt.
> >>>
> >>> Would the MCE occur just after the timer interrupt ?
> >
> > I
ping
On 02/06/2020 08:11 AM, Christophe Leroy wrote:
Commit 46d1a0f03d66 ("selftests/lkdtm: Add tests for LKDTM targets")
added generation of lkdtm test scripts.
Ignore those generated scripts when performing 'git status'
Fixes: 46d1a0f03d66 ("selftests/lkdtm: Add tests for LKDTM targets")
Le 06/02/2020 à 03:58, Jason Yan a écrit :
Now we support both 32 and 64 bit KASLR for fsl booke. Add document for
64 bit part and rename kaslr-booke32.rst to kaslr-booke.rst.
Signed-off-by: Jason Yan
Cc: Scott Wood
Cc: Diana Craciun
Cc: Michael Ellerman
Cc: Christophe Leroy
Cc:
Le 06/02/2020 à 03:58, Jason Yan a écrit :
The original kernel still exists in the memory, clear it now.
No such problem with PPC32 ? Or is that common ?
Christophe
Signed-off-by: Jason Yan
Cc: Scott Wood
Cc: Diana Craciun
Cc: Michael Ellerman
Cc: Christophe Leroy
Cc: Benjamin
Le 06/02/2020 à 03:58, Jason Yan a écrit :
The implementation for Freescale BookE64 is similar as BookE32. One
difference is that Freescale BookE64 set up a TLB mapping of 1G during
booting. Another difference is that ppc64 needs the kernel to be
64K-aligned. So we can randomize the kernel in
Le 06/02/2020 à 03:58, Jason Yan a écrit :
Like the 32bit code, we introduce reloc_kernel_entry() helper to prepare
for the KASLR 64bit version. And move the C declaration of this function
out of CONFIG_PPC32 and use long instead of int for the parameter 'addr'.
Signed-off-by: Jason Yan
Cc:
Le 06/02/2020 à 03:58, Jason Yan a écrit :
Some code refactor in kaslr_legal_offset() and kaslr_early_init(). No
functional change. This is a preparation for KASLR fsl_booke64.
Signed-off-by: Jason Yan
Cc: Scott Wood
Cc: Diana Craciun
Cc: Michael Ellerman
Cc: Christophe Leroy
Cc:
Le 20/02/2020 à 12:51, Michael Ellerman a écrit :
current_stack_pointer(), which was called __get_SP(), used to just
return the value in r1.
But that caused problems in some cases, so it was turned into a
function in commit bfe9a2cfe91a ("powerpc: Reimplement __get_SP() as a
function not a
On 07.02.2020 16:39, Alexey Budankov wrote:
>
> On 07.02.2020 14:38, Thomas Gleixner wrote:
>> Alexey Budankov writes:
>>> On 22.01.2020 17:25, Alexey Budankov wrote:
On 22.01.2020 17:07, Stephen Smalley wrote:
>> It keeps the implementation simple and readable. The implementation is
https://bugzilla.kernel.org/show_bug.cgi?id=206525
--- Comment #6 from Nikolay Aleksandrov (niko...@cumulusnetworks.com) ---
Note that the bug wasn't introduced by my commit, but instead has been there
since:
commit 4f520900522f
Author: Richard Guy Briggs
Date: Tue Apr 22 21:31:54 2014
From: Christophe Leroy
Until commit 7306e83ccf5c ("powerpc: Don't use CURRENT_THREAD_INFO to
find the stack"), the current stack base address was obtained by
calling current_thread_info(). That inline function was simply masking
out the value of r1.
In that commit, it was changed to using
From: Christophe Leroy
Instead of #ifdef, use IS_ENABLED(CONFIG_DEBUG_STACKOVERFLOW).
This enable GCC to check for code validity even when the option
is not selected.
Signed-off-by: Christophe Leroy
Signed-off-by: Michael Ellerman
Link:
From: Christophe Leroy
The purpose of check_stack_overflow() is to verify that the stack has
not overflowed.
To really know whether the stack pointer is still within boundaries,
the check must be done directly on the value of r1.
So use current_stack_pointer, which returns the current value of
From: Christophe Leroy
current_stack_frame() doesn't return the stack pointer, but the
caller's stack frame. See commit bfe9a2cfe91a ("powerpc: Reimplement
__get_SP() as a function not a define") and commit
acf620ecf56c ("powerpc: Rename __get_SP() to current_stack_pointer()")
for details.
In
current_stack_pointer(), which was called __get_SP(), used to just
return the value in r1.
But that caused problems in some cases, so it was turned into a
function in commit bfe9a2cfe91a ("powerpc: Reimplement __get_SP() as a
function not a define").
Because it's a function in a separate
Selecting CONFIG_DEBUG_INFO_BTF results in the below warning from ld:
ld: warning: orphan section `.BTF' from `.btf.vmlinux.bin.o' being placed in
section `.BTF'
Include .BTF section in vmlinux explicitly to fix the same.
Signed-off-by: Naveen N. Rao
---
arch/powerpc/kernel/vmlinux.lds.S |
Define and add a new uapi header for papr_scm describing device
specific methods (DSMs) and structs for libndctl. PAPR-SCM specific
implementation in libndctl will use these commands/structs to interact
with papr_scm kernel module. Currently only DSMs to retrieve health and
performance statistics
The DSM 'DSM_PAPR_SCM_HEALTH' should return a 'struct
nd_papr_scm_dimm_health_stat' containing information in dimm health back
to user space in response to ND_CMD_CALL. We implement this DSM by
implementing a new function papr_scm_get_health() that queries the
DIMM health information and then
Previous commit [1] introduced 'struct nd_papr_scm_dimm_health_stat' for
communicating health status of an nvdimm to libndctl. This struct
however can also be used to cache the nvdimm health information in
'struct papr_scm_priv' instead of two '__be64' values. Benefit of this
re-factoring will be
Implement support for handling PAPR DSM commands in papr_scm
module. We advertise support for ND_CMD_CALL for the dimm command mask
and implement necessary scaffolding in the module to handle ND_CMD_CALL
ioctl and DSM commands that we receive.
The layout of the DSM commands as we expect from
Add PAPR-scm family of DSM command-set to the white list of NVDIMM
command sets.
Signed-off-by: Vaibhav Jain
---
include/uapi/linux/ndctl.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index de5d90212409..99fb60600ef8 100644
---
Implement support for fetching dimm performance metrics via
H_SCM_PERFORMANCE_HEALTH hcall as documented in Ref[1]. The hcall
returns a structure as described in Ref[1] and defined as newly
introduced 'struct papr_scm_perf_stats'. The struct has a header
followed by key-value pairs of performance
Implement support for fetching dimm health information via
H_SCM_HEALTH hcall as documented in Ref[1]. The hcall returns a pair of
64-bit big-endian integers which are then stored in 'struct
papr_scm_priv' and subsequently exposed to userspace via dimm
attribute 'papr_flags'.
'papr_flags' sysfs
Add a new powerpc specific asm header named 'papr-scm.h' that descibes
the interface between PHYP and guest kernel running as an LPAR.
The HCALLs specific to managing SCM are descibed in Ref[1]. The asm
header introduced by this patch however describes the data structures
exchanged between PHYP
The PAPR standard[1][3] provides suitable mechanisms to query the health and
performance stats of an NVDIMM via various hcalls as described in Ref[2]. Until
now these stats were never available nor exposed to the user-space tools like
'ndctl'. This is partly due to PAPR platform not having support
On 2/14/20 4:33 PM, Kajol Jain wrote:
The hv_24×7 feature in IBM® POWER9™ processor-based servers provide the
facility to continuously collect large numbers of hardware performance
metrics efficiently and accurately.
This patch adds hv_24x7 json metric file for different Socket/chip
On 19. 02. 20, 18:50, Krzysztof Kozlowski wrote:
> The ioreadX() helpers have inconsistent interface. On some architectures
> void *__iomem address argument is a pointer to const, on some not.
>
> Implementations of ioreadX() do not modify the memory under the address
> so they can be converted
From: Peter Zijlstra
Architectures for which we have hardware walkers of Linux page table
should flush TLB on mmu gather batch allocation failures and batch flush.
Some architectures like POWER supports multiple translation modes (hash
and radix) and in the case of POWER only radix translation
From: Peter Zijlstra
Aneesh reported that:
tlb_flush_mmu()
tlb_flush_mmu_tlbonly()
tlb_flush() <-- #1
tlb_flush_mmu_free()
tlb_table_flush()
tlb_table_invalidate()
tlb_flush_mmu_tlbonly()
From: "Aneesh Kumar K.V"
Patch series "Fixup page directory freeing", v4.
This is a repost of patch series from Peter with the arch specific changes
except ppc64 dropped. ppc64 changes are added here because we are redoing
the patch series on top of ppc64 changes. This makes it easy to
From: Peter Zijlstra
Make issuing a TLB invalidate for page-table pages the normal case.
The reason is twofold:
- too many invalidates is safer than too few,
- most architectures use the linux page-tables natively
and would thus require this.
Make it an opt-out, instead of an opt-in.
No
From: Will Deacon
It is common for architectures with hugepage support to require only a
single TLB invalidation operation per hugepage during unmap(), rather than
iterating through the mapping at a PAGE_SIZE increment. Currently,
however, the level in the page table where the unmap() operation
From: Peter Zijlstra
Some architectures require different TLB invalidation instructions
depending on whether it is only the last-level of page table being
changed, or whether there are also changes to the intermediate
(directory) entries higher up the tree.
Add a new bit to the flags bitfield
The TLB flush optimisation (a46cc7a90f: powerpc/mm/radix: Improve TLB/PWC
flushes) may result in random memory corruption. Any concurrent page-table walk
could end up with a Use-after-Free. Even on UP this might give issues, since
mmu_gather is preemptible these days. An interrupt or preempted
On 02/19/2020 10:39 PM, Radu Rendec wrote:
On 02/19/2020 at 4:21 PM Christophe Leroy wrote:
Radu Rendec a écrit :
On 02/19/2020 at 10:11 AM Radu Rendec wrote:
On 02/18/2020 at 1:08 PM Christophe Leroy wrote:
Le 18/02/2020 à 18:07, Radu Rendec a écrit :
The saved NIP seems to be
When an interrupt has been handled, the OS notifies the interrupt
controller with a EOI sequence. On a POWER9 system using the XIVE
interrupt controller, this can be done with a load or a store
operation on the ESB interrupt management page of the interrupt. The
StoreEOI operation has less latency
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