drm/amdgpu: fix missed gpu info firmware when cache firmware during S3

gpu_info firmware is released after data is used. But when system enters into
suspend, upper class driver will cache all firmware names. At that time,
gpu_info will be failing to load. It seems an upper class issue, that we should
not release gpu_info firmware until device finished.

[  903.236589] cache_firmware: amdgpu/vega10_sdma1.bin
[  903.236590] fw_set_page_data: fw-amdgpu/vega10_sdma1.bin buf=ffff88041eee10c0 data=ffffc90002561000 size=17408
[  903.236591] cache_firmware: amdgpu/vega10_sdma1.bin ret=0
[  903.464160] __allocate_fw_buf: fw-amdgpu/vega10_gpu_info.bin buf=ffff88041eee2c00
[  903.471815] (NULL device *): loading /lib/firmware/updates/4.11.0-custom/amdgpu/vega10_gpu_info.bin failed with error -2
[  903.482870] (NULL device *): loading /lib/firmware/updates/amdgpu/vega10_gpu_info.bin failed with error -2
[  903.492716] (NULL device *): loading /lib/firmware/4.11.0-custom/amdgpu/vega10_gpu_info.bin failed with error -2
[  903.503156] (NULL device *): direct-loading amdgpu/vega10_gpu_info.bin

Signed-off-by: Huang Rui <ray.huang@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.h

@@ -1271,6 +1271,9 @@ struct amdgpu_firmware {
 	const struct amdgpu_psp_funcs *funcs;
 	struct amdgpu_bo *rbuf;
 	struct mutex mutex;
+
+	/* gpu info firmware data pointer */
+	const struct firmware *gpu_info_fw;
 };
 
 /*

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

@@ -1403,12 +1403,13 @@ static void amdgpu_device_enable_virtual_display(struct amdgpu_device *adev)
 
 static int amdgpu_device_parse_gpu_info_fw(struct amdgpu_device *adev)
 {
-	const struct firmware *fw;
 	const char *chip_name;
 	char fw_name[30];
 	int err;
 	const struct gpu_info_firmware_header_v1_0 *hdr;
 
+	adev->firmware.gpu_info_fw = NULL;
+
 	switch (adev->asic_type) {
 	case CHIP_TOPAZ:
 	case CHIP_TONGA:
@@ -1443,14 +1444,14 @@ static int amdgpu_device_parse_gpu_info_fw(struct amdgpu_device *adev)
 	}
 
 	snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_gpu_info.bin", chip_name);
-	err = request_firmware(&fw, fw_name, adev->dev);
+	err = request_firmware(&adev->firmware.gpu_info_fw, fw_name, adev->dev);
 	if (err) {
 		dev_err(adev->dev,
 			"Failed to load gpu_info firmware \"%s\"\n",
 			fw_name);
 		goto out;
 	}
-	err = amdgpu_ucode_validate(fw);
+	err = amdgpu_ucode_validate(adev->firmware.gpu_info_fw);
 	if (err) {
 		dev_err(adev->dev,
 			"Failed to validate gpu_info firmware \"%s\"\n",
@@ -1458,14 +1459,14 @@ static int amdgpu_device_parse_gpu_info_fw(struct amdgpu_device *adev)
 		goto out;
 	}
 
-	hdr = (const struct gpu_info_firmware_header_v1_0 *)fw->data;
+	hdr = (const struct gpu_info_firmware_header_v1_0 *)adev->firmware.gpu_info_fw->data;
 	amdgpu_ucode_print_gpu_info_hdr(&hdr->header);
 
 	switch (hdr->version_major) {
 	case 1:
 	{
 		const struct gpu_info_firmware_v1_0 *gpu_info_fw =
-			(const struct gpu_info_firmware_v1_0 *)(fw->data +
+			(const struct gpu_info_firmware_v1_0 *)(adev->firmware.gpu_info_fw->data +
 								le32_to_cpu(hdr->header.ucode_array_offset_bytes));
 
 		adev->gfx.config.max_shader_engines = le32_to_cpu(gpu_info_fw->gc_num_se);
@@ -1495,9 +1496,6 @@ static int amdgpu_device_parse_gpu_info_fw(struct amdgpu_device *adev)
 		goto out;
 	}
 out:
-	release_firmware(fw);
-	fw = NULL;
-
 	return err;
 }
 
@@ -2288,6 +2286,10 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
 	amdgpu_fence_driver_fini(adev);
 	amdgpu_fbdev_fini(adev);
 	r = amdgpu_fini(adev);
+	if (adev->firmware.gpu_info_fw) {
+		release_firmware(adev->firmware.gpu_info_fw);
+		adev->firmware.gpu_info_fw = NULL;
+	}
 	adev->accel_working = false;
 	cancel_delayed_work_sync(&adev->late_init_work);
 	/* free i2c buses */