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drm/amdgpu: Sync with VM root BO when switching VM to CPU update mode

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This fixes an intermittent bug where a root PD clear operation still in
progress could overwrite a PDE update done by the CPU, resulting in a
VM fault.

Fixes: 108b4d928c ("drm/amd/amdgpu: Update VM function pointer")
Reported-by: Jay Cornwall <Jay.Cornwall@amd.com>
Tested-by: Jay Cornwall <Jay.Cornwall@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling 2020-05-19 21:02:45 -04:00 committed by Alex Deucher
parent cdaae8371a
commit 90ca78deb0
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -3000,10 +3000,17 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm,
!amdgpu_gmc_vram_full_visible(&adev->gmc)),
"CPU update of VM recommended only for large BAR system\n");
if (vm->use_cpu_for_update)
if (vm->use_cpu_for_update) {
/* Sync with last SDMA update/clear before switching to CPU */
r = amdgpu_bo_sync_wait(vm->root.base.bo,
AMDGPU_FENCE_OWNER_UNDEFINED, true);
if (r)
goto free_idr;
vm->update_funcs = &amdgpu_vm_cpu_funcs;
else
} else {
vm->update_funcs = &amdgpu_vm_sdma_funcs;
}
dma_fence_put(vm->last_update);
vm->last_update = NULL;
vm->is_compute_context = true;