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drm/amdgpu: grab the id mgr lock while accessing passid_mapping

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Need to make sure that we actually dropping the right fence.
Could be done with RCU as well, but to complicated for a fix.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2019-09-09 13:57:32 +02:00 • committed by Alex Deucher
parent 1b65782468
commit 6817bf283b
1 changed files with 9 additions and 3 deletions
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12
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -1036,10 +1036,8 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job, bool need_
id->oa_base != job->oa_base || id->oa_base != job->oa_base ||
id->oa_size != job->oa_size); id->oa_size != job->oa_size);
bool vm_flush_needed = job->vm_needs_flush; bool vm_flush_needed = job->vm_needs_flush;
bool pasid_mapping_needed = id->pasid != job->pasid ||
!id->pasid_mapping ||
!dma_fence_is_signaled(id->pasid_mapping);
struct dma_fence *fence = NULL; struct dma_fence *fence = NULL;
bool pasid_mapping_needed;
unsigned patch_offset = 0; unsigned patch_offset = 0;
int r; int r;
@ -1049,6 +1047,12 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job, bool need_
pasid_mapping_needed = true; pasid_mapping_needed = true;
} }
mutex_lock(&id_mgr->lock);
if (id->pasid != job->pasid || !id->pasid_mapping ||
!dma_fence_is_signaled(id->pasid_mapping))
pasid_mapping_needed = true;
mutex_unlock(&id_mgr->lock);
gds_switch_needed &= !!ring->funcs->emit_gds_switch; gds_switch_needed &= !!ring->funcs->emit_gds_switch;
vm_flush_needed &= !!ring->funcs->emit_vm_flush && vm_flush_needed &= !!ring->funcs->emit_vm_flush &&
job->vm_pd_addr != AMDGPU_BO_INVALID_OFFSET; job->vm_pd_addr != AMDGPU_BO_INVALID_OFFSET;
@ -1088,9 +1092,11 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job, bool need_
} }
if (pasid_mapping_needed) { if (pasid_mapping_needed) {
mutex_lock(&id_mgr->lock);
id->pasid = job->pasid; id->pasid = job->pasid;
dma_fence_put(id->pasid_mapping); dma_fence_put(id->pasid_mapping);
id->pasid_mapping = dma_fence_get(fence); id->pasid_mapping = dma_fence_get(fence);
mutex_unlock(&id_mgr->lock);
} }
dma_fence_put(fence); dma_fence_put(fence);