[PATCH v3 11/16] platform/x86/amd/pmf: dump policy binary data

[Shyam Sundar S K]

On 10/10/2023 6:38 PM, Ilpo Järvinen wrote:
> On Tue, 10 Oct 2023, Shyam Sundar S K wrote:
> 
>> Sometimes policy binary retrieved from the BIOS maybe incorrect that can
>> end up in failing to enable the Smart PC solution feature.
>>
>> Use print_hex_dump_debug() to dump the policy binary in hex, so that we
>> debug the issues related to the binary even before sending that to TA.
>>
>> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k at amd.com>
>> ---
>>  drivers/platform/x86/amd/pmf/tee-if.c | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
>> index 994daf945795..e4386f503ad0 100644
>> --- a/drivers/platform/x86/amd/pmf/tee-if.c
>> +++ b/drivers/platform/x86/amd/pmf/tee-if.c
>> @@ -275,6 +275,12 @@ static int amd_pmf_start_policy_engine(struct amd_pmf_dev *dev)
>>  }
>>  
>>  #ifdef CONFIG_AMD_PMF_DEBUG
>> +static void amd_pmf_hex_dump_pb(struct amd_pmf_dev *dev)
>> +{
>> +	print_hex_dump_debug("(pb):  ", DUMP_PREFIX_OFFSET, 16, 1, dev->policy_buf,
>> +			     dev->policy_sz, false);
>> +}
>> +
> 
> You forgot to add the empty version of amd_pmf_hex_dump_pb function into 
> #else part (so the compile fails if CONFIG_AMD_PMF_DEBUG is not set).
> 

It's there (see below). I have just grouped the functions that come
under #ifdef CONFIG_AMD_PMF_DEBUG and #else so that's more readable.

>>  static ssize_t amd_pmf_get_pb_data(struct file *filp, const char __user *buf,
>>  				   size_t length, loff_t *pos)
>>  {
>> @@ -289,6 +295,7 @@ static ssize_t amd_pmf_get_pb_data(struct file *filp, const char __user *buf,
>>  	if (copy_from_user(dev->policy_buf, buf, dev->policy_sz))
>>  		return -EFAULT;
>>  
>> +	amd_pmf_hex_dump_pb(dev);
>>  	ret = amd_pmf_start_policy_engine(dev);
>>  	if (ret)
>>  		return -EINVAL;
>> @@ -327,6 +334,7 @@ static int amd_pmf_open_pb(struct amd_pmf_dev *dev, struct dentry *debugfs_root)
>>  }
>>  
>>  static void amd_pmf_remove_pb(struct amd_pmf_dev *dev) {}
>> +static void amd_pmf_hex_dump_pb(struct amd_pmf_dev *dev) {}

Here is the empty amd_pmf_hex_dump_pb().

Thanks,
Shyam

>>  #endif
>>  
>>  static int amd_pmf_get_bios_buffer(struct amd_pmf_dev *dev)
>> @@ -341,6 +349,7 @@ static int amd_pmf_get_bios_buffer(struct amd_pmf_dev *dev)
>>  
>>  	memcpy(dev->policy_buf, dev->policy_base, dev->policy_sz);
>>  
>> +	amd_pmf_hex_dump_pb(dev);
>>  	if (pb_side_load)
>>  		amd_pmf_open_pb(dev, dev->dbgfs_dir);
>>  
>>
>