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linux/drivers/scsi/scsi_trace.c
Bart Van Assche f6b8540f40 scsi: tracing: Fix handling of TRANSFER LENGTH == 0 for READ(6) and WRITE(6) 
According to SBC-2 a TRANSFER LENGTH field of zero means that 256 logical
blocks must be transferred. Make the SCSI tracing code follow SBC-2.

Fixes: bf81623542 ("[SCSI] add scsi trace core functions and put trace points")
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Link: https://lore.kernel.org/r/20191105215553.185018-1-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-11-06 00:06:03 -05:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2010 FUJITSU LIMITED
* Copyright (C) 2010 Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
*/
#include <linux/kernel.h>
#include <linux/trace_seq.h>
#include <asm/unaligned.h>
#include <trace/events/scsi.h>
#define SERVICE_ACTION16(cdb) (cdb[1] & 0x1f)
#define SERVICE_ACTION32(cdb) (get_unaligned_be16(&cdb[8]))
static const char *
scsi_trace_misc(struct trace_seq *, unsigned char *, int);
static const char *
scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
u32 lba = 0, txlen;
lba |= ((cdb[1] & 0x1F) << 16);
lba |= (cdb[2] << 8);
lba |= cdb[3];
/*
* From SBC-2: a TRANSFER LENGTH field set to zero specifies that 256
* logical blocks shall be read (READ(6)) or written (WRITE(6)).
*/
txlen = cdb[4] ? cdb[4] : 256;
trace_seq_printf(p, "lba=%u txlen=%u", lba, txlen);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw10(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
u32 lba, txlen;
lba = get_unaligned_be32(&cdb[2]);
txlen = get_unaligned_be16(&cdb[7]);
trace_seq_printf(p, "lba=%u txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);
if (cdb[0] == WRITE_SAME)
trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
u32 lba, txlen;
lba = get_unaligned_be32(&cdb[2]);
txlen = get_unaligned_be32(&cdb[6]);
trace_seq_printf(p, "lba=%u txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
u64 lba;
u32 txlen;
lba = get_unaligned_be64(&cdb[2]);
txlen = get_unaligned_be32(&cdb[10]);
trace_seq_printf(p, "lba=%llu txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);
if (cdb[0] == WRITE_SAME_16)
trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u64 lba;
u32 ei_lbrt, txlen;
switch (SERVICE_ACTION32(cdb)) {
case READ_32:
cmd = "READ";
break;
case VERIFY_32:
cmd = "VERIFY";
break;
case WRITE_32:
cmd = "WRITE";
break;
case WRITE_SAME_32:
cmd = "WRITE_SAME";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
lba = get_unaligned_be64(&cdb[12]);
ei_lbrt = get_unaligned_be32(&cdb[20]);
txlen = get_unaligned_be32(&cdb[28]);
trace_seq_printf(p, "%s_32 lba=%llu txlen=%u protect=%u ei_lbrt=%u",
cmd, lba, txlen, cdb[10] >> 5, ei_lbrt);
if (SERVICE_ACTION32(cdb) == WRITE_SAME_32)
trace_seq_printf(p, " unmap=%u", cdb[10] >> 3 & 1);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_unmap(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
unsigned int regions = get_unaligned_be16(&cdb[7]);
trace_seq_printf(p, "regions=%u", (regions - 8) / 16);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_service_action_in(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u64 lba;
u32 alloc_len;
switch (SERVICE_ACTION16(cdb)) {
case SAI_READ_CAPACITY_16:
cmd = "READ_CAPACITY_16";
break;
case SAI_GET_LBA_STATUS:
cmd = "GET_LBA_STATUS";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
lba = get_unaligned_be64(&cdb[2]);
alloc_len = get_unaligned_be32(&cdb[10]);
trace_seq_printf(p, "%s lba=%llu alloc_len=%u", cmd, lba, alloc_len);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_maintenance_in(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u32 alloc_len;
switch (SERVICE_ACTION16(cdb)) {
case MI_REPORT_IDENTIFYING_INFORMATION:
cmd = "REPORT_IDENTIFYING_INFORMATION";
break;
case MI_REPORT_TARGET_PGS:
cmd = "REPORT_TARGET_PORT_GROUPS";
break;
case MI_REPORT_ALIASES:
cmd = "REPORT_ALIASES";
break;
case MI_REPORT_SUPPORTED_OPERATION_CODES:
cmd = "REPORT_SUPPORTED_OPERATION_CODES";
break;
case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
cmd = "REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS";
break;
case MI_REPORT_PRIORITY:
cmd = "REPORT_PRIORITY";
break;
case MI_REPORT_TIMESTAMP:
cmd = "REPORT_TIMESTAMP";
break;
case MI_MANAGEMENT_PROTOCOL_IN:
cmd = "MANAGEMENT_PROTOCOL_IN";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
alloc_len = get_unaligned_be32(&cdb[6]);
trace_seq_printf(p, "%s alloc_len=%u", cmd, alloc_len);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_maintenance_out(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u32 alloc_len;
switch (SERVICE_ACTION16(cdb)) {
case MO_SET_IDENTIFYING_INFORMATION:
cmd = "SET_IDENTIFYING_INFORMATION";
break;
case MO_SET_TARGET_PGS:
cmd = "SET_TARGET_PORT_GROUPS";
break;
case MO_CHANGE_ALIASES:
cmd = "CHANGE_ALIASES";
break;
case MO_SET_PRIORITY:
cmd = "SET_PRIORITY";
break;
case MO_SET_TIMESTAMP:
cmd = "SET_TIMESTAMP";
break;
case MO_MANAGEMENT_PROTOCOL_OUT:
cmd = "MANAGEMENT_PROTOCOL_OUT";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
alloc_len = get_unaligned_be32(&cdb[6]);
trace_seq_printf(p, "%s alloc_len=%u", cmd, alloc_len);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_zbc_in(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u64 zone_id;
u32 alloc_len;
u8 options;
switch (SERVICE_ACTION16(cdb)) {
case ZI_REPORT_ZONES:
cmd = "REPORT_ZONES";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
zone_id = get_unaligned_be64(&cdb[2]);
alloc_len = get_unaligned_be32(&cdb[10]);
options = cdb[14] & 0x3f;
trace_seq_printf(p, "%s zone=%llu alloc_len=%u options=%u partial=%u",
cmd, (unsigned long long)zone_id, alloc_len,
options, (cdb[14] >> 7) & 1);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_zbc_out(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u64 zone_id;
switch (SERVICE_ACTION16(cdb)) {
case ZO_CLOSE_ZONE:
cmd = "CLOSE_ZONE";
break;
case ZO_FINISH_ZONE:
cmd = "FINISH_ZONE";
break;
case ZO_OPEN_ZONE:
cmd = "OPEN_ZONE";
break;
case ZO_RESET_WRITE_POINTER:
cmd = "RESET_WRITE_POINTER";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
zone_id = get_unaligned_be64(&cdb[2]);
trace_seq_printf(p, "%s zone=%llu all=%u", cmd,
(unsigned long long)zone_id, cdb[14] & 1);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
{
switch (SERVICE_ACTION32(cdb)) {
case READ_32:
case VERIFY_32:
case WRITE_32:
case WRITE_SAME_32:
return scsi_trace_rw32(p, cdb, len);
default:
return scsi_trace_misc(p, cdb, len);
}
}
static const char *
scsi_trace_misc(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
trace_seq_putc(p, '-');
trace_seq_putc(p, 0);
return ret;
}
const char *
scsi_trace_parse_cdb(struct trace_seq *p, unsigned char *cdb, int len)
{
switch (cdb[0]) {
case READ_6:
case WRITE_6:
return scsi_trace_rw6(p, cdb, len);
case READ_10:
case VERIFY:
case WRITE_10:
case WRITE_SAME:
return scsi_trace_rw10(p, cdb, len);
case READ_12:
case VERIFY_12:
case WRITE_12:
return scsi_trace_rw12(p, cdb, len);
case READ_16:
case VERIFY_16:
case WRITE_16:
case WRITE_SAME_16:
return scsi_trace_rw16(p, cdb, len);
case UNMAP:
return scsi_trace_unmap(p, cdb, len);
case SERVICE_ACTION_IN_16:
return scsi_trace_service_action_in(p, cdb, len);
case VARIABLE_LENGTH_CMD:
return scsi_trace_varlen(p, cdb, len);
case MAINTENANCE_IN:
return scsi_trace_maintenance_in(p, cdb, len);
case MAINTENANCE_OUT:
return scsi_trace_maintenance_out(p, cdb, len);
case ZBC_IN:
return scsi_trace_zbc_in(p, cdb, len);
case ZBC_OUT:
return scsi_trace_zbc_out(p, cdb, len);
default:
return scsi_trace_misc(p, cdb, len);
}
}
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