On Fri, Jan 5, 2024 at 1:15 AM Ma Jun <Jun.Ma2@xxxxxxx> wrote:
>
> Fix the warning info below during mode1 reset.
> [ +0.000004] Call Trace:
> [ +0.000004] <TASK>
> [ +0.000006] ? show_regs+0x6e/0x80
> [ +0.000011] ? __flush_work.isra.0+0x2e8/0x390
> [ +0.000005] ? __warn+0x91/0x150
> [ +0.000009] ? __flush_work.isra.0+0x2e8/0x390
> [ +0.000006] ? report_bug+0x19d/0x1b0
> [ +0.000013] ? handle_bug+0x46/0x80
> [ +0.000012] ? exc_invalid_op+0x1d/0x80
> [ +0.000011] ? asm_exc_invalid_op+0x1f/0x30
> [ +0.000014] ? __flush_work.isra.0+0x2e8/0x390
> [ +0.000007] ? __flush_work.isra.0+0x208/0x390
> [ +0.000007] ? _prb_read_valid+0x216/0x290
> [ +0.000008] __cancel_work_timer+0x11d/0x1a0
> [ +0.000007] ? try_to_grab_pending+0xe8/0x190
> [ +0.000012] cancel_work_sync+0x14/0x20
> [ +0.000008] amddrm_sched_stop+0x3c/0x1d0 [amd_sched]
> [ +0.000032] amdgpu_device_gpu_recover+0x29a/0xe90 [amdgpu]
>
> This warning info was printed after applying the patch
> "drm/sched: Convert drm scheduler to use a work queue rather than kthread".
> The root cause is that amdgpu driver tries to use the uninitialized
> work_struct in the struct drm_gpu_scheduler
>
> Signed-off-by: Ma Jun <Jun.Ma2@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
>
> v2:
> - Rename the function to amdgpu_ring_sched_ready and move it to
> amdgpu_ring.c (Alex)
>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 6 +++---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 14 +++++++++++++-
> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 2 +-
> 3 files changed, 17 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 4b1d5f42249f..d0d82e69b034 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -5700,7 +5700,7 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
> for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> struct amdgpu_ring *ring = tmp_adev->rings[i];
>
> - if (!ring || !drm_sched_wqueue_ready(&ring->sched))
> + if (!amdgpu_ring_sched_ready(ring))
> continue;
>
> drm_sched_stop(&ring->sched, job ? &job->base : NULL);
> @@ -5776,7 +5776,7 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
> for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> struct amdgpu_ring *ring = tmp_adev->rings[i];
>
> - if (!ring || !drm_sched_wqueue_ready(&ring->sched))
> + if (!amdgpu_ring_sched_ready(ring))
> continue;
>
> drm_sched_start(&ring->sched, true);
> @@ -6265,7 +6265,7 @@ void amdgpu_pci_resume(struct pci_dev *pdev)
> for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> struct amdgpu_ring *ring = adev->rings[i];
>
> - if (!ring || !drm_sched_wqueue_ready(&ring->sched))
> + if (!amdgpu_ring_sched_ready(ring))
> continue;
>
> drm_sched_start(&ring->sched, true);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> index 41266bc99345..9555d5532d8e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> @@ -636,7 +636,8 @@ int amdgpu_ring_test_helper(struct amdgpu_ring *ring)
> DRM_DEV_DEBUG(adev->dev, "ring test on %s succeeded\n",
> ring->name);
>
> - ring->sched.ready = !r;
> + if (!ring->no_scheduler)
> + ring->sched.ready = !r;
> return r;
> }
>
> @@ -719,3 +720,14 @@ void amdgpu_ring_ib_on_emit_de(struct amdgpu_ring *ring)
> if (ring->is_sw_ring)
> amdgpu_sw_ring_ib_mark_offset(ring, AMDGPU_MUX_OFFSET_TYPE_DE);
> }
> +
> +bool amdgpu_ring_sched_ready(struct amdgpu_ring *ring)
> +{
> + if (!ring)
> + return false;
> +
> + if (ring->no_scheduler || !drm_sched_wqueue_ready(&ring->sched))
> + return false;
> +
> + return true;
> +}
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> index bbb53720a018..fe1a61eb6e4c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> @@ -450,5 +450,5 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
> int amdgpu_ib_pool_init(struct amdgpu_device *adev);
> void amdgpu_ib_pool_fini(struct amdgpu_device *adev);
> int amdgpu_ib_ring_tests(struct amdgpu_device *adev);
> -
> +bool amdgpu_ring_sched_ready(struct amdgpu_ring *ring);
> #endif
> --
> 2.34.1
>
