drm/amdgpu: minor CS optimization

We only need to loop over all IBs for old UVD/VCE command stream patching.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -853,27 +853,28 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
 	struct amdgpu_fpriv *fpriv = p->filp->driver_priv;
 	struct amdgpu_vm *vm = &fpriv->vm;
 	struct amdgpu_ring *ring = p->job->ring;
-	int i, j, r;
+	int r;
 
-	for (i = 0, j = 0; i < p->nchunks && j < p->job->num_ibs; i++) {
+	/* Only for UVD/VCE VM emulation */
+	if (p->job->ring->funcs->parse_cs) {
+		unsigned i, j;
 
+		for (i = 0, j = 0; i < p->nchunks && j < p->job->num_ibs; i++) {
+			struct drm_amdgpu_cs_chunk_ib *chunk_ib;
+			struct amdgpu_bo_va_mapping *m;
+			struct amdgpu_bo *aobj = NULL;
 			struct amdgpu_cs_chunk *chunk;
 			struct amdgpu_ib *ib;
-		struct drm_amdgpu_cs_chunk_ib *chunk_ib;
+			uint64_t offset;
+			uint8_t *kptr;
 
 			chunk = &p->chunks[i];
 			ib = &p->job->ibs[j];
-		chunk_ib = (struct drm_amdgpu_cs_chunk_ib *)chunk->kdata;
+			chunk_ib = chunk->kdata;
 
 			if (chunk->chunk_id != AMDGPU_CHUNK_ID_IB)
 				continue;
 
-		if (p->job->ring->funcs->parse_cs) {
-			struct amdgpu_bo_va_mapping *m;
-			struct amdgpu_bo *aobj = NULL;
-			uint64_t offset;
-			uint8_t *kptr;
-
 			r = amdgpu_cs_find_mapping(p, chunk_ib->va_start,
 						   &aobj, &m);
 			if (r) {
@@ -899,13 +900,13 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
 			memcpy(ib->ptr, kptr, chunk_ib->ib_bytes);
 			amdgpu_bo_kunmap(aobj);
 
-			/* Only for UVD/VCE VM emulation */
 			r = amdgpu_ring_parse_cs(ring, p, j);
 			if (r)
 				return r;
-		}
+
 			j++;
 		}
+	}
 
 	if (p->job->vm) {
 		p->job->vm_pd_addr = amdgpu_bo_gpu_offset(vm->root.base.bo);