On Wed, Jan 4, 2023 at 5:47 PM Dmitry Baryshkov
<dmitry.baryshkov@xxxxxxxxxx> wrote:
>
> Fix another oops reproducible when rebooting the board with the Adreno
> GPU working in the headless mode (e.g. iMX platforms).
>
> Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read
> [00000000] *pgd=74936831, *pte=00000000, *ppte=00000000
> Internal error: Oops: 17 [#1] ARM
> CPU: 0 PID: 51 Comm: reboot Not tainted 6.2.0-rc1-dirty #11
> Hardware name: Freescale i.MX53 (Device Tree Support)
> PC is at msm_atomic_commit_tail+0x50/0x970
> LR is at commit_tail+0x9c/0x188
> pc : [<c06aa430>] lr : [<c067a214>] psr: 600e0013
> sp : e0851d30 ip : ee4eb7eb fp : 00090acc
> r10: 00000058 r9 : c2193014 r8 : c4310000
> r7 : c4759380 r6 : 07bef61d r5 : 00000000 r4 : 00000000
> r3 : c44cc440 r2 : 00000000 r1 : 00000000 r0 : 00000000
> Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
> Control: 10c5387d Table: 74910019 DAC: 00000051
> Register r0 information: NULL pointer
> Register r1 information: NULL pointer
> Register r2 information: NULL pointer
> Register r3 information: slab kmalloc-1k start c44cc400 pointer offset 64 size 1024
> Register r4 information: NULL pointer
> Register r5 information: NULL pointer
> Register r6 information: non-paged memory
> Register r7 information: slab kmalloc-128 start c4759380 pointer offset 0 size 128
> Register r8 information: slab kmalloc-2k start c4310000 pointer offset 0 size 2048
> Register r9 information: non-slab/vmalloc memory
> Register r10 information: non-paged memory
> Register r11 information: non-paged memory
> Register r12 information: non-paged memory
> Process reboot (pid: 51, stack limit = 0xc80046d9)
> Stack: (0xe0851d30 to 0xe0852000)
> 1d20: c4759380 fbd77200 000005ff 002b9c70
> 1d40: c4759380 c4759380 00000000 07bef61d 00000600 c0d6fe7c c2193014 00000058
> 1d60: 00090acc c067a214 00000000 c4759380 c4310000 00000000 c44cc854 c067a89c
> 1d80: 00000000 00000000 00000000 c4310468 00000000 c4759380 c4310000 c4310468
> 1da0: c4310470 c0643258 c4759380 00000000 00000000 c0c4ee24 00000000 c44cc810
> 1dc0: 00000000 c0c4ee24 00000000 c44cc810 00000000 0347d2a8 e0851e00 e0851e00
> 1de0: c4759380 c067ad20 c4310000 00000000 c44cc810 c27f8718 c44cc854 c067adb8
> 1e00: c4933000 00000002 00000001 00000000 00000000 c2130850 00000000 c2130854
> 1e20: c25fc488 00000000 c0ff162c 00000000 00000001 00000002 00000000 00000000
> 1e40: c43102c0 c43102c0 00000000 0347d2a8 c44cc810 c44cc814 c2133da8 c06d1a60
> 1e60: 00000000 00000000 00079028 c2012f24 fee1dead c4933000 00000058 c01431e4
> 1e80: 01234567 c0143a20 00000000 00000000 00000000 00000000 00000000 00000000
> 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 1ec0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 1ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 1f00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 1f20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 1f40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 1f60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 1f80: 00000000 00000000 00000000 0347d2a8 00000002 00000004 00000078 00000058
> 1fa0: c010028c c0100060 00000002 00000004 fee1dead 28121969 01234567 00079028
> 1fc0: 00000002 00000004 00000078 00000058 0002fdc5 00000000 00000000 00090acc
> 1fe0: 00000058 becc9c64 b6e97e05 b6e0e5f6 600e0030 fee1dead 00000000 00000000
> msm_atomic_commit_tail from commit_tail+0x9c/0x188
> commit_tail from drm_atomic_helper_commit+0x160/0x188
> drm_atomic_helper_commit from drm_atomic_commit+0xac/0xe0
> drm_atomic_commit from drm_atomic_helper_disable_all+0x1b0/0x1c0
> drm_atomic_helper_disable_all from drm_atomic_helper_shutdown+0x88/0x140
> drm_atomic_helper_shutdown from device_shutdown+0x16c/0x240
> device_shutdown from kernel_restart+0x38/0x90
> kernel_restart from __do_sys_reboot+0x174/0x224
> __do_sys_reboot from ret_fast_syscall+0x0/0x1c
> Exception stack(0xe0851fa8 to 0xe0851ff0)
> 1fa0: 00000002 00000004 fee1dead 28121969 01234567 00079028
> 1fc0: 00000002 00000004 00000078 00000058 0002fdc5 00000000 00000000 00090acc
> 1fe0: 00000058 becc9c64 b6e97e05 b6e0e5f6
> Code: 15922088 1184421c e1500003 1afffff8 (e5953000)
> ---[ end trace 0000000000000000 ]---
>
> Fixes: 0a58d2ae572a ("drm/msm: Make .remove and .shutdown HW shutdown consistent")
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Rob Clark <robdclark@xxxxxxxxx>
We generally want to not go down any kms related call paths as high up
the stack as possible, otherwise it is just going to be whack-a-mole
fixing the issues
BR,
-R
> ---
>
> Changes since v2:
> - Moved the condition check from msm_atomic_commit_tail() to msm_drv_shutdown()
>
> Changes since v1:
> - Moved setting of `async' before the call to trace to fix the
> uninitialized variable warning
>
> ---
> drivers/gpu/drm/msm/msm_drv.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 8b0b0ac74a6f..45e81eb148a8 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -1278,7 +1278,7 @@ void msm_drv_shutdown(struct platform_device *pdev)
> * msm_drm_init, drm_dev->registered is used as an indicator that the
> * shutdown will be successful.
> */
> - if (drm && drm->registered)
> + if (drm && drm->registered && priv->kms)
> drm_atomic_helper_shutdown(drm);
> }
>
> --
> 2.39.0
>
