amdgpu: fix multi-process hang issue

SWDEV-146499: hang during multi vulkan process testing

cause:
the second frame's PREAMBLE_IB have clear-state
and LOAD actions, those actions ruin the pipeline
that is still doing process in the previous frame's
work-load IB.

fix:
need insert pipeline sync if have context switch for
SRIOV (because only SRIOV will report PREEMPTION flag
to UMD)

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
index 5518e62..51b5e97 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
@@ -164,8 +164,10 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
                return r;
        }
 
+       need_ctx_switch = ring->current_ctx != fence_ctx;
        if (ring->funcs->emit_pipeline_sync && job &&
            ((tmp = amdgpu_sync_get_fence(&job->sched_sync, NULL)) ||
+            (amdgpu_sriov_vf(adev) && need_ctx_switch) ||
             amdgpu_vm_need_pipeline_sync(ring, job))) {
                need_pipe_sync = true;
                dma_fence_put(tmp);
@@ -196,7 +198,6 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
        }
 
        skip_preamble = ring->current_ctx == fence_ctx;
-       need_ctx_switch = ring->current_ctx != fence_ctx;
        if (job && ring->funcs->emit_cntxcntl) {
                if (need_ctx_switch)
                        status |= AMDGPU_HAVE_CTX_SWITCH;