From 8fdf074f1840eae838bbccbec37d0a1504ee432b Mon Sep 17 00:00:00 2001 From: Monk Liu Date: Tue, 6 Jun 2017 17:25:13 +0800 Subject: [PATCH] drm/amdgpu:fix world switch hang MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit for SR-IOV, we must keep the pipeline-sync in the protection of COND_EXEC, otherwise the command consumed by CPG is not consistent when world switch triggerd, e.g.: world switch hit and the IB frame is skipped so the fence won't signal, thus CP will jump to the next DMAframe's pipeline-sync command, and it will make CP hang foever. after pipelin-sync moved into COND_EXEC the consistency can be guaranteed Signed-off-by: Monk Liu Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c | 5 +++-- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 +++++-- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 2 +- 3 files changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c index 1b30d2ab9c51..659997bfff30 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c @@ -130,6 +130,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs, unsigned i; int r = 0; + bool need_pipe_sync = false; if (num_ibs == 0) return -EINVAL; @@ -165,7 +166,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs, if (ring->funcs->emit_pipeline_sync && job && ((tmp = amdgpu_sync_get_fence(&job->sched_sync)) || amdgpu_vm_need_pipeline_sync(ring, job))) { - amdgpu_ring_emit_pipeline_sync(ring); + need_pipe_sync = true; dma_fence_put(tmp); } @@ -173,7 +174,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs, ring->funcs->insert_start(ring); if (job) { - r = amdgpu_vm_flush(ring, job); + r = amdgpu_vm_flush(ring, job, need_pipe_sync); if (r) { amdgpu_ring_undo(ring); return r; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index cda9e5d8b831..30c4322ddce7 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -743,7 +743,7 @@ static bool amdgpu_vm_is_large_bar(struct amdgpu_device *adev) * * Emit a VM flush when it is necessary. */ -int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job) +int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job, bool need_pipe_sync) { struct amdgpu_device *adev = ring->adev; unsigned vmhub = ring->funcs->vmhub; @@ -765,12 +765,15 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job) vm_flush_needed = true; } - if (!vm_flush_needed && !gds_switch_needed) + if (!vm_flush_needed && !gds_switch_needed && !need_pipe_sync) return 0; if (ring->funcs->init_cond_exec) patch_offset = amdgpu_ring_init_cond_exec(ring); + if (need_pipe_sync) + amdgpu_ring_emit_pipeline_sync(ring); + if (ring->funcs->emit_vm_flush && vm_flush_needed) { struct dma_fence *fence; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h index 936f158bc5ec..3441ec58c823 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h @@ -222,7 +222,7 @@ int amdgpu_vm_alloc_pts(struct amdgpu_device *adev, int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring, struct amdgpu_sync *sync, struct dma_fence *fence, struct amdgpu_job *job); -int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job); +int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job, bool need_pipe_sync); void amdgpu_vm_reset_id(struct amdgpu_device *adev, unsigned vmhub, unsigned vmid); void amdgpu_vm_reset_all_ids(struct amdgpu_device *adev); -- 2.20.1