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

[Ilpo Järvinen]

On Tue, 10 Oct 2023, Shyam Sundar S K wrote:
> 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().

Ah, sorry. I was confused by the intermediate change.

-- 
 i.