[PATCH v2] drm/amd/amdgpu: add check that shadow page tables are GPU-accessible

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

Skip amdgpu_gem_va_update_vm otherwise. Also clean up the check for the
non-shadow page tables using the new helper function.

This fixes a crash with the stack trace:

amdgpu_gem_va_update_vm
-> amdgpu_vm_update_page_directory
 -> amdgpu_ttm_bind
  -> amdgpu_gtt_mgr_alloc

v2: actually check bo->shadow instead of just checking bo twice

Signed-off-by: Nicolai Hähnle <nicolai.haehnle at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 4e1eb05..9bd1b4e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -464,26 +464,29 @@ int amdgpu_gem_metadata_ioctl(struct drm_device *dev, void *data,
 
 unreserve:
 	amdgpu_bo_unreserve(robj);
 out:
 	drm_gem_object_unreference_unlocked(gobj);
 	return r;
 }
 
 static int amdgpu_gem_va_check(void *param, struct amdgpu_bo *bo)
 {
-	unsigned domain = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
-
 	/* if anything is swapped out don't swap it in here,
 	   just abort and wait for the next CS */
+	if (!amdgpu_bo_gpu_accessible(bo))
+		return -ERESTARTSYS;
+
+	if (bo->shadow && !amdgpu_bo_gpu_accessible(bo->shadow))
+		return -ERESTARTSYS;
 
-	return domain == AMDGPU_GEM_DOMAIN_CPU ? -ERESTARTSYS : 0;
+	return 0;
 }
 
 /**
  * amdgpu_gem_va_update_vm -update the bo_va in its VM
  *
  * @adev: amdgpu_device pointer
  * @bo_va: bo_va to update
  *
  * Update the bo_va directly after setting it's address. Errors are not
  * vital here, so they are not reported back to userspace.
-- 
2.7.4