Hello Aneesh,
I tested the new kernel today and unfortunately it doesn't run very well.
I have only one core (1 physical processor; 1 core; 2 threads) instead
of two cores (1 physical processor; 2 cores; 2 threads) so the system is
slower.
Boot log: http://www.xenosoft.de/dmesg_nemo_board_kernel_5.9.txt
Could you please check the updates?
Thanks,
Christian
On 10 August 2020 at 09:56 am, Christian Zigotzky wrote:
Hello Aneesh,
The Nemo board boots with your patch but unfortunately I don't see any
boot messages anymore.
Please find attached the kernel config.
Thanks,
Christian
On 09 August 2020 at 5:49 pm, Christian Zigotzky wrote:
Hello Aneesh,
Many thanks for your fast response and thanks a lot for your patch!
I will patch and compile a new git kernel tomorrow. I am looking
forward to the result.
Have a nice day!
Cheers,
Christian
On 9. Aug 2020, at 17:11, Aneesh Kumar K.V
<aneesh.ku...@linux.ibm.com> wrote:
"Aneesh Kumar K.V" <aneesh.ku...@linux.ibm.com> writes:
On 8/9/20 8:04 PM, Aneesh Kumar K.V wrote:
On 8/9/20 7:42 PM, Christian Zigotzky wrote:
Hello,
The Nemo board (A-EON AmigaOne X1000) [1] doesn't start with the
latest Git kernel anymore after the commit "powerpc/book3s64/pkeys:
Simplify pkey disable branch" [2].
I bisected today [3].
Result: powerpc/book3s64/pkeys: Simplify pkey disable branch
(a4678d4b477c3d2901f101986ca01406f3b7eaea) [2] is the first bad
commit.
Unfortunately I wasn't able to revert the first bad commit. The
first
bad commit depends on many other commits, which unfortunately I
don't
know. I tried to remove the modifications of the files from the
first
bad commit but without any success. There are just too many
dependencies.
Additionally I reverted the commit "selftests/powerpc: Fix pkey
syscall redefinitions" [4] and compiled a new kernel but without any
success.
Could you please check the first bad commit?
Thanks,
Christian
Can you share a successful boot log of the system so that i can
double
check the cpu_feature and mmu_feature reported ? I am looking for
details similar to below.
[ 0.000000] cpu_features = 0x0001c07f8f5f91a7
[ 0.000000] possible = 0x0001fbffcf5fb1a7
[ 0.000000] always = 0x00000003800081a1
[ 0.000000] cpu_user_features = 0xdc0065c2 0xefe00000
[ 0.000000] mmu_features = 0x7c006001
[ 0.000000] firmware_features = 0x0000001fc45bfc57
[ 0.000000] vmalloc start = 0xc008000000000000
[ 0.000000] IO start = 0xc00a000000000000
[ 0.000000] vmemmap start = 0xc00c000000000000
IIUC this is P5+? (ISA 2.04). On that pkey should be marked
disabled via
static int scan_pkey_feature(void)
{
int ret;
int pkeys_total = 0;
....
/*
* Only P7 and above supports SPRN_AMR update with MSR[PR] = 1
*/
if (!early_cpu_has_feature(CPU_FTR_ARCH_206))
return 0;
}
Can you boot with CONFIG_PPC_MEM_KEYS=n ?
Can you try this change on top of master?
modified arch/powerpc/mm/book3s64/pkeys.c
@@ -215,10 +215,6 @@ void __init pkey_early_init_devtree(void)
pr_info("Enabling pkeys with max key count %d\n", num_pkey);
out:
- /*
- * Setup uamor on boot cpu
- */
- mtspr(SPRN_UAMOR, default_uamor);
return;
}
Full patch with better description.
commit 919a177bcdaf1eaeaeecc0d0f50a688629d7b5df
Author: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
Date: Sun Aug 9 20:37:38 2020 +0530
powerpc/pkeys: Fix boot failures with Nemo board (A-EON AmigaOne
X1000)
On p6 and before we should avoid updating UAMOR SPRN. This resulted
in boot failure on Nemo board.
Fixes: 269e829f48a0 ("powerpc/book3s64/pkey: Disable pkey on
POWER6 and before")
Reported-by: Christian Zigotzky <chzigot...@xenosoft.de>
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
diff --git a/arch/powerpc/mm/book3s64/pkeys.c
b/arch/powerpc/mm/book3s64/pkeys.c
index 69a6b87f2bb4..b1d091a97611 100644
--- a/arch/powerpc/mm/book3s64/pkeys.c
+++ b/arch/powerpc/mm/book3s64/pkeys.c
@@ -73,12 +73,6 @@ static int scan_pkey_feature(void)
if (early_radix_enabled())
return 0;
- /*
- * Only P7 and above supports SPRN_AMR update with MSR[PR] = 1
- */
- if (!early_cpu_has_feature(CPU_FTR_ARCH_206))
- return 0;
-
ret = of_scan_flat_dt(dt_scan_storage_keys, &pkeys_total);
if (ret == 0) {
/*
@@ -124,6 +118,12 @@ void __init pkey_early_init_devtree(void)
__builtin_popcountl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT)
!= (sizeof(u64) * BITS_PER_BYTE));
+ /*
+ * Only P7 and above supports SPRN_AMR update with MSR[PR] = 1
+ */
+ if (!early_cpu_has_feature(CPU_FTR_ARCH_206))
+ return;
+
/* scan the device tree for pkey feature */
pkeys_total = scan_pkey_feature();
if (!pkeys_total)
