drm/amdgpu/sriov:fix memory leak after gpu reset

GPU reset will require all hw doing hw_init thus
ucode_init_bo will be invoked again, which lead to
memory leak

skip the fw_buf allocation during sriov gpu reset to avoid
memory leak.
Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1187,6 +1187,9 @@ struct amdgpu_firmware {
 
 	/* gpu info firmware data pointer */
 	const struct firmware *gpu_info_fw;
+
+	void *fw_buf_ptr;
+	uint64_t fw_buf_mc;
 };
 
 /*

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

@@ -360,8 +360,6 @@ static int amdgpu_ucode_patch_jt(struct amdgpu_firmware_info *ucode,
 int amdgpu_ucode_init_bo(struct amdgpu_device *adev)
 {
 	struct amdgpu_bo **bo = &adev->firmware.fw_buf;
-	uint64_t fw_mc_addr;
-	void *fw_buf_ptr = NULL;
 	uint64_t fw_offset = 0;
 	int i, err;
 	struct amdgpu_firmware_info *ucode = NULL;
@@ -372,6 +370,7 @@ int amdgpu_ucode_init_bo(struct amdgpu_device *adev)
 		return 0;
 	}
 
+	if (!amdgpu_sriov_vf(adev) || !adev->in_sriov_reset) {
 		err = amdgpu_bo_create(adev, adev->firmware.fw_size, PAGE_SIZE, true,
 					amdgpu_sriov_vf(adev) ? AMDGPU_GEM_DOMAIN_VRAM : AMDGPU_GEM_DOMAIN_GTT,
 					AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS,
@@ -388,21 +387,22 @@ int amdgpu_ucode_init_bo(struct amdgpu_device *adev)
 		}
 
 		err = amdgpu_bo_pin(*bo, amdgpu_sriov_vf(adev) ? AMDGPU_GEM_DOMAIN_VRAM : AMDGPU_GEM_DOMAIN_GTT,
-				&fw_mc_addr);
+					&adev->firmware.fw_buf_mc);
 		if (err) {
 			dev_err(adev->dev, "(%d) Firmware buffer pin failed\n", err);
 			goto failed_pin;
 		}
 
-	err = amdgpu_bo_kmap(*bo, &fw_buf_ptr);
+		err = amdgpu_bo_kmap(*bo, &adev->firmware.fw_buf_ptr);
 		if (err) {
 			dev_err(adev->dev, "(%d) Firmware buffer kmap failed\n", err);
 			goto failed_kmap;
 		}
 
 		amdgpu_bo_unreserve(*bo);
+	}
 
-	memset(fw_buf_ptr, 0, adev->firmware.fw_size);
+	memset(adev->firmware.fw_buf_ptr, 0, adev->firmware.fw_size);
 
 	/*
 	 * if SMU loaded firmware, it needn't add SMC, UVD, and VCE
@@ -421,14 +421,14 @@ int amdgpu_ucode_init_bo(struct amdgpu_device *adev)
 		ucode = &adev->firmware.ucode[i];
 		if (ucode->fw) {
 			header = (const struct common_firmware_header *)ucode->fw->data;
-			amdgpu_ucode_init_single_fw(adev, ucode, fw_mc_addr + fw_offset,
-						    (void *)((uint8_t *)fw_buf_ptr + fw_offset));
+			amdgpu_ucode_init_single_fw(adev, ucode, adev->firmware.fw_buf_mc + fw_offset,
+						    adev->firmware.fw_buf_ptr + fw_offset);
 			if (i == AMDGPU_UCODE_ID_CP_MEC1 &&
 			    adev->firmware.load_type != AMDGPU_FW_LOAD_PSP) {
 				const struct gfx_firmware_header_v1_0 *cp_hdr;
 				cp_hdr = (const struct gfx_firmware_header_v1_0 *)ucode->fw->data;
-				amdgpu_ucode_patch_jt(ucode, fw_mc_addr + fw_offset,
-						    fw_buf_ptr + fw_offset);
+				amdgpu_ucode_patch_jt(ucode,  adev->firmware.fw_buf_mc + fw_offset,
+						    adev->firmware.fw_buf_ptr + fw_offset);
 				fw_offset += ALIGN(le32_to_cpu(cp_hdr->jt_size) << 2, PAGE_SIZE);
 			}
 			fw_offset += ALIGN(ucode->ucode_size, PAGE_SIZE);