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

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

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@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).

>  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) {}
>  #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);
>  
> 

-- 
 i.