linux-kernel - [PATCH v2 3/3] fsi: occ: Add dynamic debug to dump command and response

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Message-Id: <20210721190231.117185-4-eajames@linux.ibm.com>
Date:   Wed, 21 Jul 2021 14:02:31 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-fsi@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        jdelvare@...e.com, linux@...ck-us.net, jk@...abs.org,
        alistair@...ple.id.au, joel@....id.au, openbmc@...ts.ozlabs.org,
        eajames@...ux.ibm.com
Subject: [PATCH v2 3/3] fsi: occ: Add dynamic debug to dump command and response

Use the dynamic branching capability of the dynamic debug subsystem
to dump the command and response with the correct OCC device name.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
Changes since v1:
 - include dynamic_debug to make sure the dynamic branching stuff is
   included on all platforms/configs

 drivers/fsi/fsi-occ.c | 45 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c
index ecf738411fe2..2bc53ea8f54f 100644
--- a/drivers/fsi/fsi-occ.c
+++ b/drivers/fsi/fsi-occ.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include <linux/device.h>
+#include <linux/dynamic_debug.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
@@ -21,6 +22,15 @@
 #include <linux/uaccess.h>
 #include <asm/unaligned.h>
 
+#if !defined(CONFIG_DYNAMIC_DEBUG_CORE)
+#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt)
+#if defined(DEBUG)
+#define DYNAMIC_DEBUG_BRANCH(descriptor) true
+#else /* DEBUG */
+#define DYNAMIC_DEBUG_BRANCH(descriptor) false
+#endif /* DEBUG */
+#endif /* CONFIG_DYNAMIC_DEBUG_CORE */
+
 #define OCC_SRAM_BYTES		4096
 #define OCC_CMD_DATA_BYTES	4090
 #define OCC_RESP_DATA_BYTES	4089
@@ -359,6 +369,20 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len,
 	byte_buf[len - 2] = checksum >> 8;
 	byte_buf[len - 1] = checksum & 0xff;
 
+	{
+		DEFINE_DYNAMIC_DEBUG_METADATA(ddm_occ_cmd, "OCC command");
+
+		if (DYNAMIC_DEBUG_BRANCH(ddm_occ_cmd)) {
+			char prefix[64];
+
+			snprintf(prefix, sizeof(prefix), "%s %s: cmd ",
+				 dev_driver_string(occ->dev),
+				 dev_name(occ->dev));
+			print_hex_dump(KERN_DEBUG, prefix, DUMP_PREFIX_OFFSET,
+				       16, 4, byte_buf, len, false);
+		}
+	}
+
 	rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len);
 	if (rc)
 		goto free;
@@ -556,6 +580,27 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
 	}
 
 	*resp_len = resp_data_length + 7;
+
+	{
+		DEFINE_DYNAMIC_DEBUG_METADATA(ddm_occ_rsp,
+					      "OCC response");
+		DEFINE_DYNAMIC_DEBUG_METADATA(ddm_occ_full_rsp,
+					      "OCC full response");
+
+		if (DYNAMIC_DEBUG_BRANCH(ddm_occ_full_rsp) ||
+		    DYNAMIC_DEBUG_BRANCH(ddm_occ_rsp)) {
+			char prefix[64];
+			size_t l = DYNAMIC_DEBUG_BRANCH(ddm_occ_full_rsp) ?
+				*resp_len : 16;
+
+			snprintf(prefix, sizeof(prefix), "%s %s: rsp ",
+				 dev_driver_string(occ->dev),
+				 dev_name(occ->dev));
+			print_hex_dump(KERN_DEBUG, prefix, DUMP_PREFIX_OFFSET,
+				       16, 4, resp, l, false);
+		}
+	}
+
 	rc = occ_verify_checksum(occ, resp, resp_data_length);
 
  done:
-- 
2.27.0