* [PATCH v3] arm64: Fix kernel panic() in cpu_do_switch_mm() on QDF2400
@ 2017-02-23 22:03 ` Shanker Donthineni
0 siblings, 0 replies; 4+ messages in thread
From: Shanker Donthineni @ 2017-02-23 22:03 UTC (permalink / raw)
To: Catalin Marinas
Cc: Will Deacon, linux-kernel, linux-arm-kernel, Mark Rutland,
James Morse, Timur Tabi, Vikram Sethi, Shanker Donthineni
The commit 38fd94b0275c 'arm64: Work around Falkor erratum 1003' has
been added to fix the hardware bug but causes a system crash. The
value of the register x1 which contains 'struct mm_struct *' should
be preserved inside macro pre_ttbr0_update_workaround.
Macro pre_ttbr0_update_workaround expects 2nd and 3rd arguments are
temporary registers. Don't clobber register x1, Otherwise the next
load operation 'mmid x1 x1' access the invalid address.
[<ffff0000080989a0>] cpu_do_switch_mm+0x20/0x40
[<ffff000008b18614>] efi_virtmap_load+0x34/0x40
[<ffff000008b1812c>] virt_efi_get_next_variable+0x64/0xc8
[<ffff000008b16204>] efivar_init+0x8c/0x348
[<ffff0000092b777c>] efisubsys_init+0xd4/0x270
[<ffff000009270c74>] do_one_initcall+0x80/0x110
[<ffff000009270ea0>] kernel_init_freeable+0x19c/0x240
[<ffff000008d8cef0>] kernel_init+0x10/0x100
[<ffff000008082ec0>] ret_from_fork+0x10/0x50
Code: d5033fdf b340bc01 d5182001 d5033fdf (f9416821)
---[ end trace 15247ca922eb6bb7 ]---
note: swapper/0[1] exited with preempt_count 2
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
SMP: stopping secondary CPUs
---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Tested-by: Manoj Iyer <manoj.iyer@canonical.com>
---
v2: include 12 digit commit-id in commit description.
v3: modified the commit subject to more descriptive.
arch/arm64/mm/proc.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index cd4d53d..877d42f 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -138,7 +138,7 @@ ENDPROC(cpu_do_resume)
* - pgd_phys - physical address of new TTB
*/
ENTRY(cpu_do_switch_mm)
- pre_ttbr0_update_workaround x0, x1, x2
+ pre_ttbr0_update_workaround x0, x2, x3
mmid x1, x1 // get mm->context.id
bfi x0, x1, #48, #16 // set the ASID
msr ttbr0_el1, x0 // set TTBR0
--
Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v3] arm64: Fix kernel panic() in cpu_do_switch_mm() on QDF2400
@ 2017-02-23 22:03 ` Shanker Donthineni
0 siblings, 0 replies; 4+ messages in thread
From: Shanker Donthineni @ 2017-02-23 22:03 UTC (permalink / raw)
To: linux-arm-kernel
The commit 38fd94b0275c 'arm64: Work around Falkor erratum 1003' has
been added to fix the hardware bug but causes a system crash. The
value of the register x1 which contains 'struct mm_struct *' should
be preserved inside macro pre_ttbr0_update_workaround.
Macro pre_ttbr0_update_workaround expects 2nd and 3rd arguments are
temporary registers. Don't clobber register x1, Otherwise the next
load operation 'mmid x1 x1' access the invalid address.
[<ffff0000080989a0>] cpu_do_switch_mm+0x20/0x40
[<ffff000008b18614>] efi_virtmap_load+0x34/0x40
[<ffff000008b1812c>] virt_efi_get_next_variable+0x64/0xc8
[<ffff000008b16204>] efivar_init+0x8c/0x348
[<ffff0000092b777c>] efisubsys_init+0xd4/0x270
[<ffff000009270c74>] do_one_initcall+0x80/0x110
[<ffff000009270ea0>] kernel_init_freeable+0x19c/0x240
[<ffff000008d8cef0>] kernel_init+0x10/0x100
[<ffff000008082ec0>] ret_from_fork+0x10/0x50
Code: d5033fdf b340bc01 d5182001 d5033fdf (f9416821)
---[ end trace 15247ca922eb6bb7 ]---
note: swapper/0[1] exited with preempt_count 2
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
SMP: stopping secondary CPUs
---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Tested-by: Manoj Iyer <manoj.iyer@canonical.com>
---
v2: include 12 digit commit-id in commit description.
v3: modified the commit subject to more descriptive.
arch/arm64/mm/proc.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index cd4d53d..877d42f 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -138,7 +138,7 @@ ENDPROC(cpu_do_resume)
* - pgd_phys - physical address of new TTB
*/
ENTRY(cpu_do_switch_mm)
- pre_ttbr0_update_workaround x0, x1, x2
+ pre_ttbr0_update_workaround x0, x2, x3
mmid x1, x1 // get mm->context.id
bfi x0, x1, #48, #16 // set the ASID
msr ttbr0_el1, x0 // set TTBR0
--
Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v3] arm64: Fix kernel panic() in cpu_do_switch_mm() on QDF2400
2017-02-23 22:03 ` Shanker Donthineni
@ 2017-02-24 10:58 ` Will Deacon
-1 siblings, 0 replies; 4+ messages in thread
From: Will Deacon @ 2017-02-24 10:58 UTC (permalink / raw)
To: Shanker Donthineni
Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Mark Rutland,
James Morse, Timur Tabi, Vikram Sethi
On Thu, Feb 23, 2017 at 04:03:38PM -0600, Shanker Donthineni wrote:
> The commit 38fd94b0275c 'arm64: Work around Falkor erratum 1003' has
> been added to fix the hardware bug but causes a system crash. The
> value of the register x1 which contains 'struct mm_struct *' should
> be preserved inside macro pre_ttbr0_update_workaround.
>
> Macro pre_ttbr0_update_workaround expects 2nd and 3rd arguments are
> temporary registers. Don't clobber register x1, Otherwise the next
> load operation 'mmid x1 x1' access the invalid address.
>
> [<ffff0000080989a0>] cpu_do_switch_mm+0x20/0x40
> [<ffff000008b18614>] efi_virtmap_load+0x34/0x40
> [<ffff000008b1812c>] virt_efi_get_next_variable+0x64/0xc8
> [<ffff000008b16204>] efivar_init+0x8c/0x348
> [<ffff0000092b777c>] efisubsys_init+0xd4/0x270
> [<ffff000009270c74>] do_one_initcall+0x80/0x110
> [<ffff000009270ea0>] kernel_init_freeable+0x19c/0x240
> [<ffff000008d8cef0>] kernel_init+0x10/0x100
> [<ffff000008082ec0>] ret_from_fork+0x10/0x50
> Code: d5033fdf b340bc01 d5182001 d5033fdf (f9416821)
> ---[ end trace 15247ca922eb6bb7 ]---
> note: swapper/0[1] exited with preempt_count 2
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
> SMP: stopping secondary CPUs
> ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
> Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
> Tested-by: Manoj Iyer <manoj.iyer@canonical.com>
> ---
> v2: include 12 digit commit-id in commit description.
> v3: modified the commit subject to more descriptive.
Thanks for the v3, but I actually already rewrote the commit log when I
applied the patch locally yesterday :)
I'll push out the branch later today once I've hoovered up any other fixes
kicking around.
Will
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v3] arm64: Fix kernel panic() in cpu_do_switch_mm() on QDF2400
@ 2017-02-24 10:58 ` Will Deacon
0 siblings, 0 replies; 4+ messages in thread
From: Will Deacon @ 2017-02-24 10:58 UTC (permalink / raw)
To: linux-arm-kernel
On Thu, Feb 23, 2017 at 04:03:38PM -0600, Shanker Donthineni wrote:
> The commit 38fd94b0275c 'arm64: Work around Falkor erratum 1003' has
> been added to fix the hardware bug but causes a system crash. The
> value of the register x1 which contains 'struct mm_struct *' should
> be preserved inside macro pre_ttbr0_update_workaround.
>
> Macro pre_ttbr0_update_workaround expects 2nd and 3rd arguments are
> temporary registers. Don't clobber register x1, Otherwise the next
> load operation 'mmid x1 x1' access the invalid address.
>
> [<ffff0000080989a0>] cpu_do_switch_mm+0x20/0x40
> [<ffff000008b18614>] efi_virtmap_load+0x34/0x40
> [<ffff000008b1812c>] virt_efi_get_next_variable+0x64/0xc8
> [<ffff000008b16204>] efivar_init+0x8c/0x348
> [<ffff0000092b777c>] efisubsys_init+0xd4/0x270
> [<ffff000009270c74>] do_one_initcall+0x80/0x110
> [<ffff000009270ea0>] kernel_init_freeable+0x19c/0x240
> [<ffff000008d8cef0>] kernel_init+0x10/0x100
> [<ffff000008082ec0>] ret_from_fork+0x10/0x50
> Code: d5033fdf b340bc01 d5182001 d5033fdf (f9416821)
> ---[ end trace 15247ca922eb6bb7 ]---
> note: swapper/0[1] exited with preempt_count 2
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
> SMP: stopping secondary CPUs
> ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
> Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
> Tested-by: Manoj Iyer <manoj.iyer@canonical.com>
> ---
> v2: include 12 digit commit-id in commit description.
> v3: modified the commit subject to more descriptive.
Thanks for the v3, but I actually already rewrote the commit log when I
applied the patch locally yesterday :)
I'll push out the branch later today once I've hoovered up any other fixes
kicking around.
Will
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-02-24 10:59 UTC | newest]
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2017-02-23 22:03 [PATCH v3] arm64: Fix kernel panic() in cpu_do_switch_mm() on QDF2400 Shanker Donthineni
2017-02-23 22:03 ` Shanker Donthineni
2017-02-24 10:58 ` Will Deacon
2017-02-24 10:58 ` Will Deacon
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