drm/amdgpu/sdma5: do not execute 0-sized IBs (v2)

This seems to help with https://bugs.freedesktop.org/show_bug.cgi?id=111481.

v2: insert a NOP instead of skipping all 0-sized IBs to avoid breaking older hw

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@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/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index fb48622..6e1b25b 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -309,6 +309,7 @@ static void gmc_v10_0_flush_gpu_tlb(struct amdgpu_device *adev, uint32_t vmid,
 
        job->vm_pd_addr = amdgpu_gmc_pd_addr(adev->gart.bo);
        job->vm_needs_flush = true;
+       job->ibs->ptr[job->ibs->length_dw++] = ring->funcs->nop;
        amdgpu_ring_pad_ib(ring, &job->ibs[0]);
        r = amdgpu_job_submit(job, &adev->mman.entity,
                              AMDGPU_FENCE_OWNER_UNDEFINED, &fence);