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![Bart Van Assche](/assets/img/avatar_default.png)
This makes the SCSI tracing code slightly easier to read.
Link: https://lore.kernel.org/r/20200313203102.16613-6-bvanassche@acm.org
Fixes: bf81623542
("[SCSI] add scsi trace core functions and put trace points")
Cc: Christoph Hellwig <hch@lst.de>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Reported-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
391 lines
8.3 KiB
C
391 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2010 FUJITSU LIMITED
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* Copyright (C) 2010 Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
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*/
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#include <linux/kernel.h>
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#include <linux/trace_seq.h>
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#include <asm/unaligned.h>
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#include <trace/events/scsi.h>
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#define SERVICE_ACTION16(cdb) (cdb[1] & 0x1f)
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#define SERVICE_ACTION32(cdb) (get_unaligned_be16(&cdb[8]))
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static const char *
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scsi_trace_misc(struct trace_seq *, unsigned char *, int);
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static const char *
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scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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u32 lba, txlen;
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lba = get_unaligned_be24(&cdb[1]) & 0x1fffff;
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/*
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* From SBC-2: a TRANSFER LENGTH field set to zero specifies that 256
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* logical blocks shall be read (READ(6)) or written (WRITE(6)).
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*/
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txlen = cdb[4] ? cdb[4] : 256;
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trace_seq_printf(p, "lba=%u txlen=%u", lba, txlen);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_rw10(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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u32 lba, txlen;
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lba = get_unaligned_be32(&cdb[2]);
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txlen = get_unaligned_be16(&cdb[7]);
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trace_seq_printf(p, "lba=%u txlen=%u protect=%u", lba, txlen,
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cdb[1] >> 5);
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if (cdb[0] == WRITE_SAME)
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trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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u32 lba, txlen;
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lba = get_unaligned_be32(&cdb[2]);
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txlen = get_unaligned_be32(&cdb[6]);
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trace_seq_printf(p, "lba=%u txlen=%u protect=%u", lba, txlen,
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cdb[1] >> 5);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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u64 lba;
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u32 txlen;
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lba = get_unaligned_be64(&cdb[2]);
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txlen = get_unaligned_be32(&cdb[10]);
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trace_seq_printf(p, "lba=%llu txlen=%u protect=%u", lba, txlen,
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cdb[1] >> 5);
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if (cdb[0] == WRITE_SAME_16)
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trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p), *cmd;
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u64 lba;
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u32 ei_lbrt, txlen;
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switch (SERVICE_ACTION32(cdb)) {
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case READ_32:
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cmd = "READ";
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break;
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case VERIFY_32:
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cmd = "VERIFY";
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break;
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case WRITE_32:
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cmd = "WRITE";
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break;
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case WRITE_SAME_32:
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cmd = "WRITE_SAME";
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break;
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default:
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trace_seq_puts(p, "UNKNOWN");
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goto out;
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}
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lba = get_unaligned_be64(&cdb[12]);
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ei_lbrt = get_unaligned_be32(&cdb[20]);
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txlen = get_unaligned_be32(&cdb[28]);
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trace_seq_printf(p, "%s_32 lba=%llu txlen=%u protect=%u ei_lbrt=%u",
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cmd, lba, txlen, cdb[10] >> 5, ei_lbrt);
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if (SERVICE_ACTION32(cdb) == WRITE_SAME_32)
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trace_seq_printf(p, " unmap=%u", cdb[10] >> 3 & 1);
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out:
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_unmap(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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unsigned int regions = get_unaligned_be16(&cdb[7]);
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trace_seq_printf(p, "regions=%u", (regions - 8) / 16);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_service_action_in(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p), *cmd;
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u64 lba;
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u32 alloc_len;
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switch (SERVICE_ACTION16(cdb)) {
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case SAI_READ_CAPACITY_16:
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cmd = "READ_CAPACITY_16";
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break;
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case SAI_GET_LBA_STATUS:
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cmd = "GET_LBA_STATUS";
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break;
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default:
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trace_seq_puts(p, "UNKNOWN");
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goto out;
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}
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lba = get_unaligned_be64(&cdb[2]);
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alloc_len = get_unaligned_be32(&cdb[10]);
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trace_seq_printf(p, "%s lba=%llu alloc_len=%u", cmd, lba, alloc_len);
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out:
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_maintenance_in(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p), *cmd;
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u32 alloc_len;
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switch (SERVICE_ACTION16(cdb)) {
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case MI_REPORT_IDENTIFYING_INFORMATION:
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cmd = "REPORT_IDENTIFYING_INFORMATION";
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break;
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case MI_REPORT_TARGET_PGS:
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cmd = "REPORT_TARGET_PORT_GROUPS";
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break;
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case MI_REPORT_ALIASES:
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cmd = "REPORT_ALIASES";
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break;
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case MI_REPORT_SUPPORTED_OPERATION_CODES:
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cmd = "REPORT_SUPPORTED_OPERATION_CODES";
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break;
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case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
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cmd = "REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS";
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break;
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case MI_REPORT_PRIORITY:
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cmd = "REPORT_PRIORITY";
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break;
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case MI_REPORT_TIMESTAMP:
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cmd = "REPORT_TIMESTAMP";
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break;
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case MI_MANAGEMENT_PROTOCOL_IN:
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cmd = "MANAGEMENT_PROTOCOL_IN";
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break;
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default:
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trace_seq_puts(p, "UNKNOWN");
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goto out;
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}
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alloc_len = get_unaligned_be32(&cdb[6]);
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trace_seq_printf(p, "%s alloc_len=%u", cmd, alloc_len);
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out:
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_maintenance_out(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p), *cmd;
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u32 alloc_len;
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switch (SERVICE_ACTION16(cdb)) {
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case MO_SET_IDENTIFYING_INFORMATION:
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cmd = "SET_IDENTIFYING_INFORMATION";
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break;
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case MO_SET_TARGET_PGS:
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cmd = "SET_TARGET_PORT_GROUPS";
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break;
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case MO_CHANGE_ALIASES:
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cmd = "CHANGE_ALIASES";
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break;
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case MO_SET_PRIORITY:
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cmd = "SET_PRIORITY";
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break;
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case MO_SET_TIMESTAMP:
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cmd = "SET_TIMESTAMP";
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break;
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case MO_MANAGEMENT_PROTOCOL_OUT:
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cmd = "MANAGEMENT_PROTOCOL_OUT";
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break;
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default:
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trace_seq_puts(p, "UNKNOWN");
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goto out;
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}
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alloc_len = get_unaligned_be32(&cdb[6]);
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trace_seq_printf(p, "%s alloc_len=%u", cmd, alloc_len);
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out:
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_zbc_in(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p), *cmd;
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u64 zone_id;
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u32 alloc_len;
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u8 options;
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switch (SERVICE_ACTION16(cdb)) {
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case ZI_REPORT_ZONES:
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cmd = "REPORT_ZONES";
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break;
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default:
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trace_seq_puts(p, "UNKNOWN");
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goto out;
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}
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zone_id = get_unaligned_be64(&cdb[2]);
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alloc_len = get_unaligned_be32(&cdb[10]);
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options = cdb[14] & 0x3f;
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trace_seq_printf(p, "%s zone=%llu alloc_len=%u options=%u partial=%u",
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cmd, (unsigned long long)zone_id, alloc_len,
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options, (cdb[14] >> 7) & 1);
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out:
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_zbc_out(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p), *cmd;
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u64 zone_id;
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switch (SERVICE_ACTION16(cdb)) {
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case ZO_CLOSE_ZONE:
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cmd = "CLOSE_ZONE";
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break;
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case ZO_FINISH_ZONE:
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cmd = "FINISH_ZONE";
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break;
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case ZO_OPEN_ZONE:
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cmd = "OPEN_ZONE";
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break;
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case ZO_RESET_WRITE_POINTER:
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cmd = "RESET_WRITE_POINTER";
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break;
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default:
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trace_seq_puts(p, "UNKNOWN");
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goto out;
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}
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zone_id = get_unaligned_be64(&cdb[2]);
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trace_seq_printf(p, "%s zone=%llu all=%u", cmd,
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(unsigned long long)zone_id, cdb[14] & 1);
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out:
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *
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scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
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{
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switch (SERVICE_ACTION32(cdb)) {
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case READ_32:
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case VERIFY_32:
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case WRITE_32:
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case WRITE_SAME_32:
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return scsi_trace_rw32(p, cdb, len);
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default:
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return scsi_trace_misc(p, cdb, len);
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}
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}
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static const char *
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scsi_trace_misc(struct trace_seq *p, unsigned char *cdb, int len)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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trace_seq_putc(p, '-');
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trace_seq_putc(p, 0);
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return ret;
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}
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const char *
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scsi_trace_parse_cdb(struct trace_seq *p, unsigned char *cdb, int len)
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{
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switch (cdb[0]) {
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case READ_6:
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case WRITE_6:
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return scsi_trace_rw6(p, cdb, len);
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case READ_10:
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case VERIFY:
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case WRITE_10:
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case WRITE_SAME:
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return scsi_trace_rw10(p, cdb, len);
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case READ_12:
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case VERIFY_12:
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case WRITE_12:
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return scsi_trace_rw12(p, cdb, len);
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case READ_16:
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case VERIFY_16:
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case WRITE_16:
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case WRITE_SAME_16:
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return scsi_trace_rw16(p, cdb, len);
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case UNMAP:
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return scsi_trace_unmap(p, cdb, len);
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case SERVICE_ACTION_IN_16:
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return scsi_trace_service_action_in(p, cdb, len);
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case VARIABLE_LENGTH_CMD:
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return scsi_trace_varlen(p, cdb, len);
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case MAINTENANCE_IN:
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return scsi_trace_maintenance_in(p, cdb, len);
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case MAINTENANCE_OUT:
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return scsi_trace_maintenance_out(p, cdb, len);
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case ZBC_IN:
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return scsi_trace_zbc_in(p, cdb, len);
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case ZBC_OUT:
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return scsi_trace_zbc_out(p, cdb, len);
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default:
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return scsi_trace_misc(p, cdb, len);
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}
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}
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