Re: [PATCH v4 05/27] drm/amd: Add a new helper for loading/validating microcode

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

Am 04.01.23 um 05:53 schrieb Lazar, Lijo:
>
>
> On 1/4/2023 3:48 AM, Mario Limonciello wrote:
>> All microcode runs a basic validation after it's been loaded. Each
>> IP block as part of init will run both.
>>
>> Introduce a wrapper for request_firmware and amdgpu_ucode_validate.
>> This wrapper will also remap any error codes from request_firmware
>> to -ENODEV.  This is so that early_init will fail if firmware couldn't
>> be loaded instead of the IP block being disabled.
>>
>> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
>> ---
>> v3-v4:
>>   * New patch
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c | 24 +++++++++++++++++++++++
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h |  1 +
>>   2 files changed, 25 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
>> index eafcddce58d3..8c4a7b09e344 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
>> @@ -1312,3 +1312,27 @@ void amdgpu_ucode_ip_version_decode(struct 
>> amdgpu_device *adev, int block_type,
>>         snprintf(ucode_prefix, len, "%s_%d_%d_%d", ip_name, maj, min, 
>> rev);
>>   }
>> +
>> +/*
>> + * amdgpu_ucode_load - Load and validate amdgpu microcode
>> + *
>> + * @adev: amdgpu device
>> + * @fw: pointer to load firmware to
>> + * @fw_name: firmware to load
>> + *
>> + * This is a helper that will use request_firmware and 
>> amdgpu_ucode_validate
>> + * to load and run basic validation on firmware. If the load fails, 
>> remap
>> + * the error code to -ENODEV, so that early_init functions will fail 
>> to load.
>> + */
>> +int amdgpu_ucode_load(struct amdgpu_device *adev, const struct 
>> firmware **fw, char *fw_name)
>
> 'load' also takes a different meaning of loading firmware to ASIC. 
> Maybe keep it as 'get' and keep another corresponding common 'put' for 
> release_firmware?

get/put are usually used for reference counting, how about sticking with 
request/release instead? That's used by the underlying functionality as 
well IIRC.

Christian.

>
> Thanks,
> Lijo
>
>> +{
>> +    int err = request_firmware(fw, fw_name, adev->dev);
>> +
>> +    if (err)
>> +        return -ENODEV;
>> +    err = amdgpu_ucode_validate(*fw);
>> +    if (err)
>> +        dev_dbg(adev->dev, "\"%s\" failed to validate\n", fw_name);
>> +
>> +    return err;
>> +}
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h
>> index 552e06929229..b9139fb44506 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h
>> @@ -544,6 +544,7 @@ void amdgpu_ucode_print_sdma_hdr(const struct 
>> common_firmware_header *hdr);
>>   void amdgpu_ucode_print_psp_hdr(const struct common_firmware_header 
>> *hdr);
>>   void amdgpu_ucode_print_gpu_info_hdr(const struct 
>> common_firmware_header *hdr);
>>   int amdgpu_ucode_validate(const struct firmware *fw);
>> +int amdgpu_ucode_load(struct amdgpu_device *adev, const struct 
>> firmware **fw, char *fw_name);
>>   bool amdgpu_ucode_hdr_version(union amdgpu_firmware_header *hdr,
>>                   uint16_t hdr_major, uint16_t hdr_minor);