platform/x86/amd/pmf: dump policy binary data

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.
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20231212014705.2017474-13-Shyam-sundar.S-k@amd.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/amd/pmf/tee-if.c

@@ -276,6 +276,12 @@ 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)
 {
@@ -299,6 +305,7 @@ static ssize_t amd_pmf_get_pb_data(struct file *filp, const char __user *buf,
 	dev->policy_buf = new_policy_buf;
 	dev->policy_sz = length;
 
+	amd_pmf_hex_dump_pb(dev);
 	ret = amd_pmf_start_policy_engine(dev);
 	if (ret)
 		return -EINVAL;
@@ -324,6 +331,7 @@ static void amd_pmf_remove_pb(struct amd_pmf_dev *dev)
 #else
 static void 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)
@@ -338,6 +346,7 @@ 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);