drm/amdkfd: Fix user queue validation on Gfx7/8

To workaround queue full h/w issue on Gfx7/8, when application create
AQL queue, the ring buffer bo allocate size is queue_size/2 and
map queue_size ring buffer to GPU in 2 pieces using 2 attachments, each
attachment map size is queue_size/2, with same ring_bo backing memory.

For Gfx7/8, user queue buffer validation should use queue_size/2 to
verify ring_bo allocation and mapping size.

Fixes: 68e599d ("drm/amdkfd: Validate user queue buffers")
Suggested-by: Tomáš Trnka <trnka@scm.com>
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit e7a4777)
Cc: stable@vger.kernel.org

drivers/gpu/drm/amd/amdkfd/kfd_queue.c

@@ -233,6 +233,7 @@ void kfd_queue_buffer_put(struct amdgpu_bo **bo)
 int kfd_queue_acquire_buffers(struct kfd_process_device *pdd, struct queue_properties *properties)
 {
 	struct kfd_topology_device *topo_dev;
+	u64 expected_queue_size;
 	struct amdgpu_vm *vm;
 	u32 total_cwsr_size;
 	int err;
@@ -241,6 +242,15 @@ int kfd_queue_acquire_buffers(struct kfd_process_device *pdd, struct queue_prope
 	if (!topo_dev)
 		return -EINVAL;
 
+	/* AQL queues on GFX7 and GFX8 appear twice their actual size */
+	if (properties->type == KFD_QUEUE_TYPE_COMPUTE &&
+	    properties->format == KFD_QUEUE_FORMAT_AQL &&
+	    topo_dev->node_props.gfx_target_version >= 70000 &&
+	    topo_dev->node_props.gfx_target_version < 90000)
+		expected_queue_size = properties->queue_size / 2;
+	else
+		expected_queue_size = properties->queue_size;
+
 	vm = drm_priv_to_vm(pdd->drm_priv);
 	err = amdgpu_bo_reserve(vm->root.bo, false);
 	if (err)
@@ -255,7 +265,7 @@ int kfd_queue_acquire_buffers(struct kfd_process_device *pdd, struct queue_prope
 		goto out_err_unreserve;
 
 	err = kfd_queue_buffer_get(vm, (void *)properties->queue_address,
-				   &properties->ring_bo, properties->queue_size);
+				   &properties->ring_bo, expected_queue_size);
 	if (err)
 		goto out_err_unreserve;