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drm/amdgpu: fix locking scope when flushing tlb 

Which method is used to flush tlb does not depend on whether a reset is
in progress or not. We should skip flush altogether if the GPU will get
reset. So put both path under reset_domain read lock.

Signed-off-by: Yunxiang Li <Yunxiang.Li@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org
This commit is contained in:
Yunxiang Li 2024-05-23 07:48:19 -04:00 committed by Alex Deucher
parent e2654a4453
commit 84801d4f1e
1 changed files with 34 additions and 32 deletions
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66
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
View File

@ -684,12 +684,17 @@ int amdgpu_gmc_flush_gpu_tlb_pasid(struct amdgpu_device *adev, uint16_t pasid,
struct amdgpu_ring *ring = &adev->gfx.kiq[inst].ring;
struct amdgpu_kiq *kiq = &adev->gfx.kiq[inst];
unsigned int ndw;
signed long r;
int r;
uint32_t seq;
if (!adev->gmc.flush_pasid_uses_kiq || !ring->sched.ready ||
!down_read_trylock(&adev->reset_domain->sem)) {
/*
* A GPU reset should flush all TLBs anyway, so no need to do
* this while one is ongoing.
*/
if (!down_read_trylock(&adev->reset_domain->sem))
return 0;
if (!adev->gmc.flush_pasid_uses_kiq || !ring->sched.ready) {
if (adev->gmc.flush_tlb_needs_extra_type_2)
adev->gmc.gmc_funcs->flush_gpu_tlb_pasid(adev, pasid,
2, all_hub,
@ -703,44 +708,41 @@ int amdgpu_gmc_flush_gpu_tlb_pasid(struct amdgpu_device *adev, uint16_t pasid,
adev->gmc.gmc_funcs->flush_gpu_tlb_pasid(adev, pasid,
flush_type, all_hub,
inst);
return 0;
}
r = 0;
} else {
/* 2 dwords flush + 8 dwords fence */
ndw = kiq->pmf->invalidate_tlbs_size + 8;
/* 2 dwords flush + 8 dwords fence */
ndw = kiq->pmf->invalidate_tlbs_size + 8;
if (adev->gmc.flush_tlb_needs_extra_type_2)
ndw += kiq->pmf->invalidate_tlbs_size;
if (adev->gmc.flush_tlb_needs_extra_type_2)
ndw += kiq->pmf->invalidate_tlbs_size;
if (adev->gmc.flush_tlb_needs_extra_type_0)
ndw += kiq->pmf->invalidate_tlbs_size;
if (adev->gmc.flush_tlb_needs_extra_type_0)
ndw += kiq->pmf->invalidate_tlbs_size;
spin_lock(&adev->gfx.kiq[inst].ring_lock);
amdgpu_ring_alloc(ring, ndw);
if (adev->gmc.flush_tlb_needs_extra_type_2)
kiq->pmf->kiq_invalidate_tlbs(ring, pasid, 2, all_hub);
spin_lock(&adev->gfx.kiq[inst].ring_lock);
amdgpu_ring_alloc(ring, ndw);
if (adev->gmc.flush_tlb_needs_extra_type_2)
kiq->pmf->kiq_invalidate_tlbs(ring, pasid, 2, all_hub);
if (flush_type == 2 && adev->gmc.flush_tlb_needs_extra_type_0)
kiq->pmf->kiq_invalidate_tlbs(ring, pasid, 0, all_hub);
if (flush_type == 2 && adev->gmc.flush_tlb_needs_extra_type_0)
kiq->pmf->kiq_invalidate_tlbs(ring, pasid, 0, all_hub);
kiq->pmf->kiq_invalidate_tlbs(ring, pasid, flush_type, all_hub);
r = amdgpu_fence_emit_polling(ring, &seq, MAX_KIQ_REG_WAIT);
if (r) {
amdgpu_ring_undo(ring);
spin_unlock(&adev->gfx.kiq[inst].ring_lock);
goto error_unlock_reset;
}
kiq->pmf->kiq_invalidate_tlbs(ring, pasid, flush_type, all_hub);
r = amdgpu_fence_emit_polling(ring, &seq, MAX_KIQ_REG_WAIT);
if (r) {
amdgpu_ring_undo(ring);
amdgpu_ring_commit(ring);
spin_unlock(&adev->gfx.kiq[inst].ring_lock);
goto error_unlock_reset;
if (amdgpu_fence_wait_polling(ring, seq, usec_timeout) < 1) {
dev_err(adev->dev, "timeout waiting for kiq fence\n");
r = -ETIME;
}
}
amdgpu_ring_commit(ring);
spin_unlock(&adev->gfx.kiq[inst].ring_lock);
r = amdgpu_fence_wait_polling(ring, seq, usec_timeout);
if (r < 1) {
dev_err(adev->dev, "wait for kiq fence error: %ld.\n", r);
r = -ETIME;
goto error_unlock_reset;
}
r = 0;
error_unlock_reset:
up_read(&adev->reset_domain->sem);
return r;