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

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On 10/10/2023 07:59, 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@xxxxxxx>

Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>

---
  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);
+}
+
  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);




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