drivers/scsi/scsi_logging.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * scsi_logging.c
  *
  * Copyright (C) 2014 SUSE Linux Products GmbH
  * Copyright (C) 2014 Hannes Reinecke <hare@suse.de>
  */

 #include <linux/kernel.h>
 #include <linux/atomic.h>

 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_dbg.h>

 static char *scsi_log_reserve_buffer(size_t *len)
 {
 	*len = 128;
 	return kmalloc(*len, GFP_ATOMIC);
 }

 static void scsi_log_release_buffer(char *bufptr)
 {
 	kfree(bufptr);
 }

 static inline const char *scmd_name(const struct scsi_cmnd *scmd)
 {
 	struct request *rq = scsi_cmd_to_rq((struct scsi_cmnd *)scmd);

 	if (!rq->q || !rq->q->disk)
 		return NULL;
 	return rq->q->disk->disk_name;
 }

 static size_t sdev_format_header(char *logbuf, size_t logbuf_len,
 				 const char *name, int tag)
 {
 	size_t off = 0;

 	if (name)
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 "[%s] ", name);

 	if (WARN_ON(off >= logbuf_len))
 		return off;

 	if (tag >= 0)
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 "tag#%d ", tag);
 	return off;
 }

 void sdev_prefix_printk(const char *level, const struct scsi_device *sdev,
 			const char *name, const char *fmt, ...)
 {
 	va_list args;
 	char *logbuf;
 	size_t off = 0, logbuf_len;

 	if (!sdev)
 		return;

 	logbuf = scsi_log_reserve_buffer(&logbuf_len);
 	if (!logbuf)
 		return;

 	if (name)
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 "[%s] ", name);
 	if (!WARN_ON(off >= logbuf_len)) {
 		va_start(args, fmt);
 		off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
 		va_end(args);
 	}
 	dev_printk(level, &sdev->sdev_gendev, "%s", logbuf);
 	scsi_log_release_buffer(logbuf);
 }
 EXPORT_SYMBOL(sdev_prefix_printk);

 void scmd_printk(const char *level, const struct scsi_cmnd *scmd,
 		const char *fmt, ...)
 {
 	va_list args;
 	char *logbuf;
 	size_t off = 0, logbuf_len;

 	if (!scmd)
 		return;

 	logbuf = scsi_log_reserve_buffer(&logbuf_len);
 	if (!logbuf)
 		return;
 	off = sdev_format_header(logbuf, logbuf_len, scmd_name(scmd),
 				 scsi_cmd_to_rq((struct scsi_cmnd *)scmd)->tag);
 	if (off < logbuf_len) {
 		va_start(args, fmt);
 		off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
 		va_end(args);
 	}
 	dev_printk(level, &scmd->device->sdev_gendev, "%s", logbuf);
 	scsi_log_release_buffer(logbuf);
 }
 EXPORT_SYMBOL(scmd_printk);

 static size_t scsi_format_opcode_name(char *buffer, size_t buf_len,
 				      const unsigned char *cdbp)
 {
 	int sa, cdb0;
 	const char *cdb_name = NULL, *sa_name = NULL;
 	size_t off;

 	cdb0 = cdbp[0];
 	if (cdb0 == VARIABLE_LENGTH_CMD) {
 		int len = scsi_varlen_cdb_length(cdbp);

 		if (len < 10) {
 			off = scnprintf(buffer, buf_len,
 					"short variable length command, len=%d",
 					len);
 			return off;
 		}
 		sa = (cdbp[8] << 8) + cdbp[9];
 	} else
 		sa = cdbp[1] & 0x1f;

 	if (!scsi_opcode_sa_name(cdb0, sa, &cdb_name, &sa_name)) {
 		if (cdb_name)
 			off = scnprintf(buffer, buf_len, "%s", cdb_name);
 		else {
 			off = scnprintf(buffer, buf_len, "opcode=0x%x", cdb0);
 			if (WARN_ON(off >= buf_len))
 				return off;
 			if (cdb0 >= VENDOR_SPECIFIC_CDB)
 				off += scnprintf(buffer + off, buf_len - off,
 						 " (vendor)");
 			else if (cdb0 >= 0x60 && cdb0 < 0x7e)
 				off += scnprintf(buffer + off, buf_len - off,
 						 " (reserved)");
 		}
 	} else {
 		if (sa_name)
 			off = scnprintf(buffer, buf_len, "%s", sa_name);
 		else if (cdb_name)
 			off = scnprintf(buffer, buf_len, "%s, sa=0x%x",
 					cdb_name, sa);
 		else
 			off = scnprintf(buffer, buf_len,
 					"opcode=0x%x, sa=0x%x", cdb0, sa);
 	}
 	WARN_ON(off >= buf_len);
 	return off;
 }

 size_t __scsi_format_command(char *logbuf, size_t logbuf_len,
 			     const unsigned char *cdb, size_t cdb_len)
 {
 	int len, k;
 	size_t off;

 	off = scsi_format_opcode_name(logbuf, logbuf_len, cdb);
 	if (off >= logbuf_len)
 		return off;
 	len = scsi_command_size(cdb);
 	if (cdb_len < len)
 		len = cdb_len;
 	/* print out all bytes in cdb */
 	for (k = 0; k < len; ++k) {
 		if (off > logbuf_len - 3)
 			break;
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 " %02x", cdb[k]);
 	}
 	return off;
 }
 EXPORT_SYMBOL(__scsi_format_command);

 void scsi_print_command(struct scsi_cmnd *cmd)
 {
 	int k;
 	char *logbuf;
 	size_t off, logbuf_len;

 	logbuf = scsi_log_reserve_buffer(&logbuf_len);
 	if (!logbuf)
 		return;

 	off = sdev_format_header(logbuf, logbuf_len,
 				 scmd_name(cmd), scsi_cmd_to_rq(cmd)->tag);
 	if (off >= logbuf_len)
 		goto out_printk;
 	off += scnprintf(logbuf + off, logbuf_len - off, "CDB: ");
 	if (WARN_ON(off >= logbuf_len))
 		goto out_printk;

 	off += scsi_format_opcode_name(logbuf + off, logbuf_len - off,
 				       cmd->cmnd);
 	if (off >= logbuf_len)
 		goto out_printk;

 	/* print out all bytes in cdb */
 	if (cmd->cmd_len > 16) {
 		/* Print opcode in one line and use separate lines for CDB */
 		off += scnprintf(logbuf + off, logbuf_len - off, "\n");
 		dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
 		for (k = 0; k < cmd->cmd_len; k += 16) {
 			size_t linelen = min(cmd->cmd_len - k, 16);

 			off = sdev_format_header(logbuf, logbuf_len,
 						 scmd_name(cmd),
 						 scsi_cmd_to_rq(cmd)->tag);
 			if (!WARN_ON(off > logbuf_len - 58)) {
 				off += scnprintf(logbuf + off, logbuf_len - off,
 						 "CDB[%02x]: ", k);
 				hex_dump_to_buffer(&cmd->cmnd[k], linelen,
 						   16, 1, logbuf + off,
 						   logbuf_len - off, false);
 			}
 			dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s",
 				   logbuf);
 		}
 		goto out;
 	}
 	if (!WARN_ON(off > logbuf_len - 49)) {
 		off += scnprintf(logbuf + off, logbuf_len - off, " ");
 		hex_dump_to_buffer(cmd->cmnd, cmd->cmd_len, 16, 1,
 				   logbuf + off, logbuf_len - off,
 				   false);
 	}
 out_printk:
 	dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
 out:
 	scsi_log_release_buffer(logbuf);
 }
 EXPORT_SYMBOL(scsi_print_command);

 static size_t
 scsi_format_extd_sense(char *buffer, size_t buf_len,
 		       unsigned char asc, unsigned char ascq)
 {
 	size_t off = 0;
 	const char *extd_sense_fmt = NULL;
 	const char *extd_sense_str = scsi_extd_sense_format(asc, ascq,
 							    &extd_sense_fmt);

 	if (extd_sense_str) {
 		off = scnprintf(buffer, buf_len, "Add. Sense: %s",
 				extd_sense_str);
 		if (extd_sense_fmt)
 			off += scnprintf(buffer + off, buf_len - off,
 					 "(%s%x)", extd_sense_fmt, ascq);
 	} else {
 		if (asc >= 0x80)
 			off = scnprintf(buffer, buf_len, "<<vendor>>");
 		off += scnprintf(buffer + off, buf_len - off,
 				 "ASC=0x%x ", asc);
 		if (ascq >= 0x80)
 			off += scnprintf(buffer + off, buf_len - off,
 					 "<<vendor>>");
 		off += scnprintf(buffer + off, buf_len - off,
 				 "ASCQ=0x%x ", ascq);
 	}
 	return off;
 }

 static size_t
 scsi_format_sense_hdr(char *buffer, size_t buf_len,
 		      const struct scsi_sense_hdr *sshdr)
 {
 	const char *sense_txt;
 	size_t off;

 	off = scnprintf(buffer, buf_len, "Sense Key : ");
 	sense_txt = scsi_sense_key_string(sshdr->sense_key);
 	if (sense_txt)
 		off += scnprintf(buffer + off, buf_len - off,
 				 "%s ", sense_txt);
 	else
 		off += scnprintf(buffer + off, buf_len - off,
 				 "0x%x ", sshdr->sense_key);
 	off += scnprintf(buffer + off, buf_len - off,
 		scsi_sense_is_deferred(sshdr) ? "[deferred] " : "[current] ");

 	if (sshdr->response_code >= 0x72)
 		off += scnprintf(buffer + off, buf_len - off, "[descriptor] ");
 	return off;
 }

 static void
 scsi_log_dump_sense(const struct scsi_device *sdev, const char *name, int tag,
 		    const unsigned char *sense_buffer, int sense_len)
 {
 	char *logbuf;
 	size_t logbuf_len;
 	int i;

 	logbuf = scsi_log_reserve_buffer(&logbuf_len);
 	if (!logbuf)
 		return;

 	for (i = 0; i < sense_len; i += 16) {
 		int len = min(sense_len - i, 16);
 		size_t off;

 		off = sdev_format_header(logbuf, logbuf_len,
 					 name, tag);
 		hex_dump_to_buffer(&sense_buffer[i], len, 16, 1,
 				   logbuf + off, logbuf_len - off,
 				   false);
 		dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
 	}
 	scsi_log_release_buffer(logbuf);
 }

 static void
 scsi_log_print_sense_hdr(const struct scsi_device *sdev, const char *name,
 			 int tag, const struct scsi_sense_hdr *sshdr)
 {
 	char *logbuf;
 	size_t off, logbuf_len;

 	logbuf = scsi_log_reserve_buffer(&logbuf_len);
 	if (!logbuf)
 		return;
 	off = sdev_format_header(logbuf, logbuf_len, name, tag);
 	off += scsi_format_sense_hdr(logbuf + off, logbuf_len - off, sshdr);
 	dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
 	scsi_log_release_buffer(logbuf);

 	logbuf = scsi_log_reserve_buffer(&logbuf_len);
 	if (!logbuf)
 		return;
 	off = sdev_format_header(logbuf, logbuf_len, name, tag);
 	off += scsi_format_extd_sense(logbuf + off, logbuf_len - off,
 				      sshdr->asc, sshdr->ascq);
 	dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
 	scsi_log_release_buffer(logbuf);
 }

 static void
 scsi_log_print_sense(const struct scsi_device *sdev, const char *name, int tag,
 		     const unsigned char *sense_buffer, int sense_len)
 {
 	struct scsi_sense_hdr sshdr;

 	if (scsi_normalize_sense(sense_buffer, sense_len, &sshdr))
 		scsi_log_print_sense_hdr(sdev, name, tag, &sshdr);
 	else
 		scsi_log_dump_sense(sdev, name, tag, sense_buffer, sense_len);
 }

 /*
  * Print normalized SCSI sense header with a prefix.
  */
 void
 scsi_print_sense_hdr(const struct scsi_device *sdev, const char *name,
 		     const struct scsi_sense_hdr *sshdr)
 {
 	scsi_log_print_sense_hdr(sdev, name, -1, sshdr);
 }
 EXPORT_SYMBOL(scsi_print_sense_hdr);

 /* Normalize and print sense buffer with name prefix */
 void __scsi_print_sense(const struct scsi_device *sdev, const char *name,
 			const unsigned char *sense_buffer, int sense_len)
 {
 	scsi_log_print_sense(sdev, name, -1, sense_buffer, sense_len);
 }
 EXPORT_SYMBOL(__scsi_print_sense);

 /* Normalize and print sense buffer in SCSI command */
 void scsi_print_sense(const struct scsi_cmnd *cmd)
 {
 	scsi_log_print_sense(cmd->device, scmd_name(cmd),
 			     scsi_cmd_to_rq((struct scsi_cmnd *)cmd)->tag,
 			     cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
 }
 EXPORT_SYMBOL(scsi_print_sense);

 void scsi_print_result(const struct scsi_cmnd *cmd, const char *msg,
 		       int disposition)
 {
 	char *logbuf;
 	size_t off, logbuf_len;
 	const char *mlret_string = scsi_mlreturn_string(disposition);
 	const char *hb_string = scsi_hostbyte_string(cmd->result);
 	unsigned long cmd_age = (jiffies - cmd->jiffies_at_alloc) / HZ;

 	logbuf = scsi_log_reserve_buffer(&logbuf_len);
 	if (!logbuf)
 		return;

 	off = sdev_format_header(logbuf, logbuf_len, scmd_name(cmd),
 				 scsi_cmd_to_rq((struct scsi_cmnd *)cmd)->tag);

 	if (off >= logbuf_len)
 		goto out_printk;

 	if (msg) {
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 "%s: ", msg);
 		if (WARN_ON(off >= logbuf_len))
 			goto out_printk;
 	}
 	if (mlret_string)
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 "%s ", mlret_string);
 	else
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 "UNKNOWN(0x%02x) ", disposition);
 	if (WARN_ON(off >= logbuf_len))
 		goto out_printk;

 	off += scnprintf(logbuf + off, logbuf_len - off, "Result: ");
 	if (WARN_ON(off >= logbuf_len))
 		goto out_printk;

 	if (hb_string)
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 "hostbyte=%s ", hb_string);
 	else
 		off += scnprintf(logbuf + off, logbuf_len - off,
 				 "hostbyte=0x%02x ", host_byte(cmd->result));
 	if (WARN_ON(off >= logbuf_len))
 		goto out_printk;

 	off += scnprintf(logbuf + off, logbuf_len - off,
 			 "driverbyte=DRIVER_OK ");

 	off += scnprintf(logbuf + off, logbuf_len - off,
 			 "cmd_age=%lus", cmd_age);

 out_printk:
 	dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
 	scsi_log_release_buffer(logbuf);
 }
 EXPORT_SYMBOL(scsi_print_result);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* scsi_logging.c
	*
	* Copyright (C) 2014 SUSE Linux Products GmbH
	* Copyright (C) 2014 Hannes Reinecke <hare@suse.de>
	*/

	#include <linux/kernel.h>
	#include <linux/atomic.h>

	#include <scsi/scsi.h>
	#include <scsi/scsi_cmnd.h>
	#include <scsi/scsi_device.h>
	#include <scsi/scsi_eh.h>
	#include <scsi/scsi_dbg.h>

	static char scsi_log_reserve_buffer(size_t len)
	{
	*len = 128;
	return kmalloc(*len, GFP_ATOMIC);
	}

	static void scsi_log_release_buffer(char *bufptr)
	{
	kfree(bufptr);
	}

	static inline const char scmd_name(const struct scsi_cmnd scmd)
	{
	struct request rq = scsi_cmd_to_rq((struct scsi_cmnd )scmd);

	if (!rq->q \|\| !rq->q->disk)
	return NULL;
	return rq->q->disk->disk_name;
	}

	static size_t sdev_format_header(char *logbuf, size_t logbuf_len,
	const char *name, int tag)
	{
	size_t off = 0;

	if (name)
	off += scnprintf(logbuf + off, logbuf_len - off,
	"[%s] ", name);

	if (WARN_ON(off >= logbuf_len))
	return off;

	if (tag >= 0)
	off += scnprintf(logbuf + off, logbuf_len - off,
	"tag#%d ", tag);
	return off;
	}

	void sdev_prefix_printk(const char level, const struct scsi_device sdev,
	const char name, const char fmt, ...)
	{
	va_list args;
	char *logbuf;
	size_t off = 0, logbuf_len;

	if (!sdev)
	return;

	logbuf = scsi_log_reserve_buffer(&logbuf_len);
	if (!logbuf)
	return;

	if (name)
	off += scnprintf(logbuf + off, logbuf_len - off,
	"[%s] ", name);
	if (!WARN_ON(off >= logbuf_len)) {
	va_start(args, fmt);
	off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
	va_end(args);
	}
	dev_printk(level, &sdev->sdev_gendev, "%s", logbuf);
	scsi_log_release_buffer(logbuf);
	}
	EXPORT_SYMBOL(sdev_prefix_printk);

	void scmd_printk(const char level, const struct scsi_cmnd scmd,
	const char *fmt, ...)
	{
	va_list args;
	char *logbuf;
	size_t off = 0, logbuf_len;

	if (!scmd)
	return;

	logbuf = scsi_log_reserve_buffer(&logbuf_len);
	if (!logbuf)
	return;
	off = sdev_format_header(logbuf, logbuf_len, scmd_name(scmd),
	scsi_cmd_to_rq((struct scsi_cmnd *)scmd)->tag);
	if (off < logbuf_len) {
	va_start(args, fmt);
	off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
	va_end(args);
	}
	dev_printk(level, &scmd->device->sdev_gendev, "%s", logbuf);
	scsi_log_release_buffer(logbuf);
	}
	EXPORT_SYMBOL(scmd_printk);

	static size_t scsi_format_opcode_name(char *buffer, size_t buf_len,
	const unsigned char *cdbp)
	{
	int sa, cdb0;
	const char cdb_name = NULL, sa_name = NULL;
	size_t off;

	cdb0 = cdbp[0];
	if (cdb0 == VARIABLE_LENGTH_CMD) {
	int len = scsi_varlen_cdb_length(cdbp);

	if (len < 10) {
	off = scnprintf(buffer, buf_len,
	"short variable length command, len=%d",
	len);
	return off;
	}
	sa = (cdbp[8] << 8) + cdbp[9];
	} else
	sa = cdbp[1] & 0x1f;

	if (!scsi_opcode_sa_name(cdb0, sa, &cdb_name, &sa_name)) {
	if (cdb_name)
	off = scnprintf(buffer, buf_len, "%s", cdb_name);
	else {
	off = scnprintf(buffer, buf_len, "opcode=0x%x", cdb0);
	if (WARN_ON(off >= buf_len))
	return off;
	if (cdb0 >= VENDOR_SPECIFIC_CDB)
	off += scnprintf(buffer + off, buf_len - off,
	" (vendor)");
	else if (cdb0 >= 0x60 && cdb0 < 0x7e)
	off += scnprintf(buffer + off, buf_len - off,
	" (reserved)");
	}
	} else {
	if (sa_name)
	off = scnprintf(buffer, buf_len, "%s", sa_name);
	else if (cdb_name)
	off = scnprintf(buffer, buf_len, "%s, sa=0x%x",
	cdb_name, sa);
	else
	off = scnprintf(buffer, buf_len,
	"opcode=0x%x, sa=0x%x", cdb0, sa);
	}
	WARN_ON(off >= buf_len);
	return off;
	}

	size_t __scsi_format_command(char *logbuf, size_t logbuf_len,
	const unsigned char *cdb, size_t cdb_len)
	{
	int len, k;
	size_t off;

	off = scsi_format_opcode_name(logbuf, logbuf_len, cdb);
	if (off >= logbuf_len)
	return off;
	len = scsi_command_size(cdb);
	if (cdb_len < len)
	len = cdb_len;
	/* print out all bytes in cdb */
	for (k = 0; k < len; ++k) {
	if (off > logbuf_len - 3)
	break;
	off += scnprintf(logbuf + off, logbuf_len - off,
	" %02x", cdb[k]);
	}
	return off;
	}
	EXPORT_SYMBOL(__scsi_format_command);

	void scsi_print_command(struct scsi_cmnd *cmd)
	{
	int k;
	char *logbuf;
	size_t off, logbuf_len;

	logbuf = scsi_log_reserve_buffer(&logbuf_len);
	if (!logbuf)
	return;

	off = sdev_format_header(logbuf, logbuf_len,
	scmd_name(cmd), scsi_cmd_to_rq(cmd)->tag);
	if (off >= logbuf_len)
	goto out_printk;
	off += scnprintf(logbuf + off, logbuf_len - off, "CDB: ");
	if (WARN_ON(off >= logbuf_len))
	goto out_printk;

	off += scsi_format_opcode_name(logbuf + off, logbuf_len - off,
	cmd->cmnd);
	if (off >= logbuf_len)
	goto out_printk;

	/* print out all bytes in cdb */
	if (cmd->cmd_len > 16) {
	/* Print opcode in one line and use separate lines for CDB */
	off += scnprintf(logbuf + off, logbuf_len - off, "\n");
	dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
	for (k = 0; k < cmd->cmd_len; k += 16) {
	size_t linelen = min(cmd->cmd_len - k, 16);

	off = sdev_format_header(logbuf, logbuf_len,
	scmd_name(cmd),
	scsi_cmd_to_rq(cmd)->tag);
	if (!WARN_ON(off > logbuf_len - 58)) {
	off += scnprintf(logbuf + off, logbuf_len - off,
	"CDB[%02x]: ", k);
	hex_dump_to_buffer(&cmd->cmnd[k], linelen,
	16, 1, logbuf + off,
	logbuf_len - off, false);
	}
	dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s",
	logbuf);
	}
	goto out;
	}
	if (!WARN_ON(off > logbuf_len - 49)) {
	off += scnprintf(logbuf + off, logbuf_len - off, " ");
	hex_dump_to_buffer(cmd->cmnd, cmd->cmd_len, 16, 1,
	logbuf + off, logbuf_len - off,
	false);
	}
	out_printk:
	dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
	out:
	scsi_log_release_buffer(logbuf);
	}
	EXPORT_SYMBOL(scsi_print_command);

	static size_t
	scsi_format_extd_sense(char *buffer, size_t buf_len,
	unsigned char asc, unsigned char ascq)
	{
	size_t off = 0;
	const char *extd_sense_fmt = NULL;
	const char *extd_sense_str = scsi_extd_sense_format(asc, ascq,
	&extd_sense_fmt);

	if (extd_sense_str) {
	off = scnprintf(buffer, buf_len, "Add. Sense: %s",
	extd_sense_str);
	if (extd_sense_fmt)
	off += scnprintf(buffer + off, buf_len - off,
	"(%s%x)", extd_sense_fmt, ascq);
	} else {
	if (asc >= 0x80)
	off = scnprintf(buffer, buf_len, "<<vendor>>");
	off += scnprintf(buffer + off, buf_len - off,
	"ASC=0x%x ", asc);
	if (ascq >= 0x80)
	off += scnprintf(buffer + off, buf_len - off,
	"<<vendor>>");
	off += scnprintf(buffer + off, buf_len - off,
	"ASCQ=0x%x ", ascq);
	}
	return off;
	}

	static size_t
	scsi_format_sense_hdr(char *buffer, size_t buf_len,
	const struct scsi_sense_hdr *sshdr)
	{
	const char *sense_txt;
	size_t off;

	off = scnprintf(buffer, buf_len, "Sense Key : ");
	sense_txt = scsi_sense_key_string(sshdr->sense_key);
	if (sense_txt)
	off += scnprintf(buffer + off, buf_len - off,
	"%s ", sense_txt);
	else
	off += scnprintf(buffer + off, buf_len - off,
	"0x%x ", sshdr->sense_key);
	off += scnprintf(buffer + off, buf_len - off,
	scsi_sense_is_deferred(sshdr) ? "[deferred] " : "[current] ");

	if (sshdr->response_code >= 0x72)
	off += scnprintf(buffer + off, buf_len - off, "[descriptor] ");
	return off;
	}

	static void
	scsi_log_dump_sense(const struct scsi_device sdev, const char name, int tag,
	const unsigned char *sense_buffer, int sense_len)
	{
	char *logbuf;
	size_t logbuf_len;
	int i;

	logbuf = scsi_log_reserve_buffer(&logbuf_len);
	if (!logbuf)
	return;

	for (i = 0; i < sense_len; i += 16) {
	int len = min(sense_len - i, 16);
	size_t off;

	off = sdev_format_header(logbuf, logbuf_len,
	name, tag);
	hex_dump_to_buffer(&sense_buffer[i], len, 16, 1,
	logbuf + off, logbuf_len - off,
	false);
	dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
	}
	scsi_log_release_buffer(logbuf);
	}

	static void
	scsi_log_print_sense_hdr(const struct scsi_device sdev, const char name,
	int tag, const struct scsi_sense_hdr *sshdr)
	{
	char *logbuf;
	size_t off, logbuf_len;

	logbuf = scsi_log_reserve_buffer(&logbuf_len);
	if (!logbuf)
	return;
	off = sdev_format_header(logbuf, logbuf_len, name, tag);
	off += scsi_format_sense_hdr(logbuf + off, logbuf_len - off, sshdr);
	dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
	scsi_log_release_buffer(logbuf);

	logbuf = scsi_log_reserve_buffer(&logbuf_len);
	if (!logbuf)
	return;
	off = sdev_format_header(logbuf, logbuf_len, name, tag);
	off += scsi_format_extd_sense(logbuf + off, logbuf_len - off,
	sshdr->asc, sshdr->ascq);
	dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
	scsi_log_release_buffer(logbuf);
	}

	static void
	scsi_log_print_sense(const struct scsi_device sdev, const char name, int tag,
	const unsigned char *sense_buffer, int sense_len)
	{
	struct scsi_sense_hdr sshdr;

	if (scsi_normalize_sense(sense_buffer, sense_len, &sshdr))
	scsi_log_print_sense_hdr(sdev, name, tag, &sshdr);
	else
	scsi_log_dump_sense(sdev, name, tag, sense_buffer, sense_len);
	}

	/*
	* Print normalized SCSI sense header with a prefix.
	*/
	void
	scsi_print_sense_hdr(const struct scsi_device sdev, const char name,
	const struct scsi_sense_hdr *sshdr)
	{
	scsi_log_print_sense_hdr(sdev, name, -1, sshdr);
	}
	EXPORT_SYMBOL(scsi_print_sense_hdr);

	/* Normalize and print sense buffer with name prefix */
	void __scsi_print_sense(const struct scsi_device sdev, const char name,
	const unsigned char *sense_buffer, int sense_len)
	{
	scsi_log_print_sense(sdev, name, -1, sense_buffer, sense_len);
	}
	EXPORT_SYMBOL(__scsi_print_sense);

	/* Normalize and print sense buffer in SCSI command */
	void scsi_print_sense(const struct scsi_cmnd *cmd)
	{
	scsi_log_print_sense(cmd->device, scmd_name(cmd),
	scsi_cmd_to_rq((struct scsi_cmnd *)cmd)->tag,
	cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
	}
	EXPORT_SYMBOL(scsi_print_sense);

	void scsi_print_result(const struct scsi_cmnd cmd, const char msg,
	int disposition)
	{
	char *logbuf;
	size_t off, logbuf_len;
	const char *mlret_string = scsi_mlreturn_string(disposition);
	const char *hb_string = scsi_hostbyte_string(cmd->result);
	unsigned long cmd_age = (jiffies - cmd->jiffies_at_alloc) / HZ;

	logbuf = scsi_log_reserve_buffer(&logbuf_len);
	if (!logbuf)
	return;

	off = sdev_format_header(logbuf, logbuf_len, scmd_name(cmd),
	scsi_cmd_to_rq((struct scsi_cmnd *)cmd)->tag);

	if (off >= logbuf_len)
	goto out_printk;

	if (msg) {
	off += scnprintf(logbuf + off, logbuf_len - off,
	"%s: ", msg);
	if (WARN_ON(off >= logbuf_len))
	goto out_printk;
	}
	if (mlret_string)
	off += scnprintf(logbuf + off, logbuf_len - off,
	"%s ", mlret_string);
	else
	off += scnprintf(logbuf + off, logbuf_len - off,
	"UNKNOWN(0x%02x) ", disposition);
	if (WARN_ON(off >= logbuf_len))
	goto out_printk;

	off += scnprintf(logbuf + off, logbuf_len - off, "Result: ");
	if (WARN_ON(off >= logbuf_len))
	goto out_printk;

	if (hb_string)
	off += scnprintf(logbuf + off, logbuf_len - off,
	"hostbyte=%s ", hb_string);
	else
	off += scnprintf(logbuf + off, logbuf_len - off,
	"hostbyte=0x%02x ", host_byte(cmd->result));
	if (WARN_ON(off >= logbuf_len))
	goto out_printk;

	off += scnprintf(logbuf + off, logbuf_len - off,
	"driverbyte=DRIVER_OK ");

	off += scnprintf(logbuf + off, logbuf_len - off,
	"cmd_age=%lus", cmd_age);

	out_printk:
	dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
	scsi_log_release_buffer(logbuf);
	}
	EXPORT_SYMBOL(scsi_print_result);