drm/amdgpu: fix zeroing all IB fields manually v2

The problem now is that we don't necessarily call amdgpu_ib_get()
in some error paths and so work with uninitialized data.

Better require that the memory is already zeroed.

v2: better commit message
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com> (v1)
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -260,7 +260,7 @@ int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p, void *data)
 	}
 
 
-	p->ibs = kmalloc_array(p->num_ibs, sizeof(struct amdgpu_ib), GFP_KERNEL);
+	p->ibs = kcalloc(p->num_ibs, sizeof(struct amdgpu_ib), GFP_KERNEL);
 	if (!p->ibs)
 		r = -ENOMEM;
 

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

@@ -73,29 +73,12 @@ int amdgpu_ib_get(struct amdgpu_ring *ring, struct amdgpu_vm *vm,
 
 		if (!vm)
 			ib->gpu_addr = amdgpu_sa_bo_gpu_addr(ib->sa_bo);
-		else
-			ib->gpu_addr = 0;
-
-	} else {
-		ib->sa_bo = NULL;
-		ib->ptr = NULL;
-		ib->gpu_addr = 0;
 	}
 
 	amdgpu_sync_create(&ib->sync);
 
 	ib->ring = ring;
-	ib->fence = NULL;
-	ib->user = NULL;
 	ib->vm = vm;
-	ib->ctx = NULL;
-	ib->gds_base = 0;
-	ib->gds_size = 0;
-	ib->gws_base = 0;
-	ib->gws_size = 0;
-	ib->oa_base = 0;
-	ib->oa_size = 0;
-	ib->flags = 0;
 
 	return 0;
 }

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

@@ -630,6 +630,7 @@ static int cik_sdma_ring_test_ib(struct amdgpu_ring *ring)
 	gpu_addr = adev->wb.gpu_addr + (index * 4);
 	tmp = 0xCAFEDEAD;
 	adev->wb.wb[index] = cpu_to_le32(tmp);
+	memset(&ib, 0, sizeof(ib));
 	r = amdgpu_ib_get(ring, NULL, 256, &ib);
 	if (r) {
 		DRM_ERROR("amdgpu: failed to get ib (%d).\n", r);

drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c

@@ -2660,6 +2660,7 @@ static int gfx_v7_0_ring_test_ib(struct amdgpu_ring *ring)
 		return r;
 	}
 	WREG32(scratch, 0xCAFEDEAD);
+	memset(&ib, 0, sizeof(ib));
 	r = amdgpu_ib_get(ring, NULL, 256, &ib);
 	if (r) {
 		DRM_ERROR("amdgpu: failed to get ib (%d).\n", r);

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -622,6 +622,7 @@ static int gfx_v8_0_ring_test_ib(struct amdgpu_ring *ring)
 		return r;
 	}
 	WREG32(scratch, 0xCAFEDEAD);
+	memset(&ib, 0, sizeof(ib));
 	r = amdgpu_ib_get(ring, NULL, 256, &ib);
 	if (r) {
 		DRM_ERROR("amdgpu: failed to get ib (%d).\n", r);

drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c

@@ -689,6 +689,7 @@ static int sdma_v2_4_ring_test_ib(struct amdgpu_ring *ring)
 	gpu_addr = adev->wb.gpu_addr + (index * 4);
 	tmp = 0xCAFEDEAD;
 	adev->wb.wb[index] = cpu_to_le32(tmp);
+	memset(&ib, 0, sizeof(ib));
 	r = amdgpu_ib_get(ring, NULL, 256, &ib);
 	if (r) {
 		DRM_ERROR("amdgpu: failed to get ib (%d).\n", r);

drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c

@@ -810,6 +810,7 @@ static int sdma_v3_0_ring_test_ib(struct amdgpu_ring *ring)
 	gpu_addr = adev->wb.gpu_addr + (index * 4);
 	tmp = 0xCAFEDEAD;
 	adev->wb.wb[index] = cpu_to_le32(tmp);
+	memset(&ib, 0, sizeof(ib));
 	r = amdgpu_ib_get(ring, NULL, 256, &ib);
 	if (r) {
 		DRM_ERROR("amdgpu: failed to get ib (%d).\n", r);