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/*
* scsi_logging.c
*
* Copyright (C) 2014 SUSE Linux Products GmbH
* Copyright (C) 2014 Hannes Reinecke <hare@suse.de>
*
* This file is released under the GPLv2
*/
#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>
#define SCSI_LOG_SPOOLSIZE 4096
#if (SCSI_LOG_SPOOLSIZE / SCSI_LOG_BUFSIZE) > BITS_PER_LONG
#warning SCSI logging bitmask too large
#endif
struct scsi_log_buf {
char buffer[SCSI_LOG_SPOOLSIZE];
unsigned long map;
};
static DEFINE_PER_CPU(struct scsi_log_buf, scsi_format_log);
static char *scsi_log_reserve_buffer(size_t *len)
{
struct scsi_log_buf *buf;
unsigned long map_bits = sizeof(buf->buffer) / SCSI_LOG_BUFSIZE;
unsigned long idx = 0;
preempt_disable();
buf = this_cpu_ptr(&scsi_format_log);
idx = find_first_zero_bit(&buf->map, map_bits);
if (likely(idx < map_bits)) {
while (test_and_set_bit(idx, &buf->map)) {
idx = find_next_zero_bit(&buf->map, map_bits, idx);
if (idx >= map_bits)
break;
}
}
if (WARN_ON(idx >= map_bits)) {
preempt_enable();
return NULL;
}
*len = SCSI_LOG_BUFSIZE;
return buf->buffer + idx * SCSI_LOG_BUFSIZE;
}
static void scsi_log_release_buffer(char *bufptr)
{
struct scsi_log_buf *buf;
unsigned long idx;
int ret;
buf = this_cpu_ptr(&scsi_format_log);
if (bufptr >= buf->buffer &&
bufptr < buf->buffer + SCSI_LOG_SPOOLSIZE) {
idx = (bufptr - buf->buffer) / SCSI_LOG_BUFSIZE;
ret = test_and_clear_bit(idx, &buf->map);
WARN_ON(!ret);
}
preempt_enable();
}
static size_t scmd_format_header(char *logbuf, size_t logbuf_len,
struct gendisk *disk, int tag)
{
size_t off = 0;
if (disk)
off += scnprintf(logbuf + off, logbuf_len - off,
"[%s] ", disk->disk_name);
if (WARN_ON(off >= logbuf_len))
return off;
if (tag >= 0)
off += scnprintf(logbuf + off, logbuf_len - off,
"tag#%d ", tag);
return off;
}
int 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;
int ret;
if (!sdev)
return 0;
logbuf = scsi_log_reserve_buffer(&logbuf_len);
if (!logbuf)
return 0;
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);
}
ret = dev_printk(level, &sdev->sdev_gendev, "%s", logbuf);
scsi_log_release_buffer(logbuf);
return ret;
}
EXPORT_SYMBOL(sdev_prefix_printk);
int scmd_printk(const char *level, const struct scsi_cmnd *scmd,
const char *fmt, ...)
{
struct gendisk *disk = scmd->request->rq_disk;
va_list args;
char *logbuf;
size_t off = 0, logbuf_len;
int ret;
if (!scmd || !scmd->cmnd)
return 0;
logbuf = scsi_log_reserve_buffer(&logbuf_len);
if (!logbuf)
return 0;
off = scmd_format_header(logbuf, logbuf_len, disk,
scmd->request->tag);
if (off < logbuf_len) {
va_start(args, fmt);
off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
va_end(args);
}
ret = dev_printk(level, &scmd->device->sdev_gendev, "%s", logbuf);
scsi_log_release_buffer(logbuf);
return ret;
}
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)
{
struct gendisk *disk = cmd->request->rq_disk;
int k;
char *logbuf;
size_t off, logbuf_len;
if (!cmd->cmnd)
return;
logbuf = scsi_log_reserve_buffer(&logbuf_len);
if (!logbuf)
return;
off = scmd_format_header(logbuf, logbuf_len, disk, cmd->request->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, logbuf);
scsi_log_release_buffer(logbuf);
for (k = 0; k < cmd->cmd_len; k += 16) {
size_t linelen = min(cmd->cmd_len - k, 16);
logbuf = scsi_log_reserve_buffer(&logbuf_len);
if (!logbuf)
break;
off = scmd_format_header(logbuf, logbuf_len, disk,
cmd->request->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,
logbuf);
scsi_log_release_buffer(logbuf);
}
return;
}
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, logbuf);
scsi_log_release_buffer(logbuf);
}
EXPORT_SYMBOL(scsi_print_command);
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