[PATCH] drm/amdgpu: Fix Illegal opcode in command stream Error

[Arvind Yadav]

When applications closes, it triggers the drm_file_free
function which subsequently releases all allocated buffer
objects. Concurrently, the resume_worker thread will attempt
to map the usermode queue. However, since the wptr buffer
object has already been deallocated, this will result in
an Illegal opcode error being raised in the command stream.
Now the usermode queue will not be mapped if the wptr buffer
object is freed.

Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Christian Koenig <christian.koenig at amd.com>
Signed-off-by: Arvind Yadav <arvind.yadav at amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c | 22 +++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
index c11fcdd604fc..378a6284e05b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
@@ -28,6 +28,21 @@
 #include "amdgpu_userqueue.h"
 #include "amdgpu_userq_fence.h"
 
+static bool
+amdgpu_userq_validate_bo_mapping(struct amdgpu_usermode_queue *queue,
+				 uint64_t addr)
+{
+	struct amdgpu_bo_va_mapping *mapping;
+	struct amdgpu_vm *vm = queue->vm;
+
+	addr &= AMDGPU_GMC_HOLE_MASK;
+	mapping = amdgpu_vm_bo_lookup_mapping(vm, addr >> PAGE_SHIFT);
+	if (!mapping)
+		return false;
+
+	return true;
+}
+
 static void amdgpu_userq_walk_and_drop_fence_drv(struct xarray *xa)
 {
 	struct amdgpu_userq_fence_driver *fence_drv;
@@ -390,9 +405,12 @@ amdgpu_userqueue_resume_all(struct amdgpu_userq_mgr *uq_mgr)
 	userq_funcs = adev->userq_funcs[AMDGPU_HW_IP_GFX];
 
 	/* Resume all the queues for this process */
-	idr_for_each_entry(&uq_mgr->userq_idr, queue, queue_id)
-		ret = userq_funcs->resume(uq_mgr, queue);
+	idr_for_each_entry(&uq_mgr->userq_idr, queue, queue_id) {
+		if (amdgpu_userq_validate_bo_mapping(queue,
+				queue->userq_prop->wptr_gpu_addr))
+			ret = userq_funcs->resume(uq_mgr, queue);
 
+	}
 	if (ret)
 		DRM_ERROR("Failed to resume all the queue\n");
 	return ret;
-- 
2.34.1