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dccc96abfb
The data structure used for log messages is so large that it can cause a
boot failure. Since allocations from that data structure can fail anyway,
use kmalloc() / kfree() instead of that data structure.
See also https://bugzilla.kernel.org/show_bug.cgi?id=204119.
See also commit ded85c193a ("scsi: Implement per-cpu logging buffer") # v4.0.
Reported-by: Jan Palus <jpalus@fastmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Jan Palus <jpalus@fastmail.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
443 lines
11 KiB
C
443 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* scsi_logging.c
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*
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* Copyright (C) 2014 SUSE Linux Products GmbH
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* Copyright (C) 2014 Hannes Reinecke <hare@suse.de>
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*/
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#include <linux/kernel.h>
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#include <linux/atomic.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_dbg.h>
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static char *scsi_log_reserve_buffer(size_t *len)
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{
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*len = 128;
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return kmalloc(*len, GFP_ATOMIC);
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}
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static void scsi_log_release_buffer(char *bufptr)
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{
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kfree(bufptr);
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}
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static inline const char *scmd_name(const struct scsi_cmnd *scmd)
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{
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return scmd->request->rq_disk ?
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scmd->request->rq_disk->disk_name : NULL;
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}
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static size_t sdev_format_header(char *logbuf, size_t logbuf_len,
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const char *name, int tag)
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{
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size_t off = 0;
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if (name)
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off += scnprintf(logbuf + off, logbuf_len - off,
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"[%s] ", name);
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if (WARN_ON(off >= logbuf_len))
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return off;
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if (tag >= 0)
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off += scnprintf(logbuf + off, logbuf_len - off,
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"tag#%d ", tag);
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return off;
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}
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void sdev_prefix_printk(const char *level, const struct scsi_device *sdev,
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const char *name, const char *fmt, ...)
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{
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va_list args;
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char *logbuf;
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size_t off = 0, logbuf_len;
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if (!sdev)
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return;
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logbuf = scsi_log_reserve_buffer(&logbuf_len);
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if (!logbuf)
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return;
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if (name)
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off += scnprintf(logbuf + off, logbuf_len - off,
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"[%s] ", name);
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if (!WARN_ON(off >= logbuf_len)) {
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va_start(args, fmt);
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off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
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va_end(args);
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}
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dev_printk(level, &sdev->sdev_gendev, "%s", logbuf);
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scsi_log_release_buffer(logbuf);
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}
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EXPORT_SYMBOL(sdev_prefix_printk);
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void scmd_printk(const char *level, const struct scsi_cmnd *scmd,
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const char *fmt, ...)
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{
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va_list args;
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char *logbuf;
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size_t off = 0, logbuf_len;
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if (!scmd || !scmd->cmnd)
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return;
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logbuf = scsi_log_reserve_buffer(&logbuf_len);
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if (!logbuf)
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return;
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off = sdev_format_header(logbuf, logbuf_len, scmd_name(scmd),
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scmd->request->tag);
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if (off < logbuf_len) {
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va_start(args, fmt);
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off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
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va_end(args);
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}
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dev_printk(level, &scmd->device->sdev_gendev, "%s", logbuf);
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scsi_log_release_buffer(logbuf);
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}
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EXPORT_SYMBOL(scmd_printk);
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static size_t scsi_format_opcode_name(char *buffer, size_t buf_len,
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const unsigned char *cdbp)
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{
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int sa, cdb0;
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const char *cdb_name = NULL, *sa_name = NULL;
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size_t off;
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cdb0 = cdbp[0];
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if (cdb0 == VARIABLE_LENGTH_CMD) {
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int len = scsi_varlen_cdb_length(cdbp);
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if (len < 10) {
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off = scnprintf(buffer, buf_len,
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"short variable length command, len=%d",
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len);
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return off;
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}
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sa = (cdbp[8] << 8) + cdbp[9];
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} else
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sa = cdbp[1] & 0x1f;
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if (!scsi_opcode_sa_name(cdb0, sa, &cdb_name, &sa_name)) {
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if (cdb_name)
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off = scnprintf(buffer, buf_len, "%s", cdb_name);
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else {
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off = scnprintf(buffer, buf_len, "opcode=0x%x", cdb0);
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if (WARN_ON(off >= buf_len))
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return off;
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if (cdb0 >= VENDOR_SPECIFIC_CDB)
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off += scnprintf(buffer + off, buf_len - off,
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" (vendor)");
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else if (cdb0 >= 0x60 && cdb0 < 0x7e)
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off += scnprintf(buffer + off, buf_len - off,
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" (reserved)");
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}
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} else {
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if (sa_name)
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off = scnprintf(buffer, buf_len, "%s", sa_name);
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else if (cdb_name)
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off = scnprintf(buffer, buf_len, "%s, sa=0x%x",
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cdb_name, sa);
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else
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off = scnprintf(buffer, buf_len,
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"opcode=0x%x, sa=0x%x", cdb0, sa);
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}
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WARN_ON(off >= buf_len);
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return off;
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}
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size_t __scsi_format_command(char *logbuf, size_t logbuf_len,
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const unsigned char *cdb, size_t cdb_len)
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{
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int len, k;
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size_t off;
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off = scsi_format_opcode_name(logbuf, logbuf_len, cdb);
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if (off >= logbuf_len)
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return off;
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len = scsi_command_size(cdb);
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if (cdb_len < len)
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len = cdb_len;
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/* print out all bytes in cdb */
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for (k = 0; k < len; ++k) {
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if (off > logbuf_len - 3)
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break;
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off += scnprintf(logbuf + off, logbuf_len - off,
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" %02x", cdb[k]);
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}
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return off;
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}
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EXPORT_SYMBOL(__scsi_format_command);
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void scsi_print_command(struct scsi_cmnd *cmd)
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{
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int k;
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char *logbuf;
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size_t off, logbuf_len;
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if (!cmd->cmnd)
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return;
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logbuf = scsi_log_reserve_buffer(&logbuf_len);
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if (!logbuf)
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return;
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off = sdev_format_header(logbuf, logbuf_len,
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scmd_name(cmd), cmd->request->tag);
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if (off >= logbuf_len)
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goto out_printk;
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off += scnprintf(logbuf + off, logbuf_len - off, "CDB: ");
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if (WARN_ON(off >= logbuf_len))
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goto out_printk;
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off += scsi_format_opcode_name(logbuf + off, logbuf_len - off,
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cmd->cmnd);
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if (off >= logbuf_len)
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goto out_printk;
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/* print out all bytes in cdb */
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if (cmd->cmd_len > 16) {
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/* Print opcode in one line and use separate lines for CDB */
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off += scnprintf(logbuf + off, logbuf_len - off, "\n");
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dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
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scsi_log_release_buffer(logbuf);
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for (k = 0; k < cmd->cmd_len; k += 16) {
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size_t linelen = min(cmd->cmd_len - k, 16);
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logbuf = scsi_log_reserve_buffer(&logbuf_len);
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if (!logbuf)
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break;
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off = sdev_format_header(logbuf, logbuf_len,
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scmd_name(cmd),
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cmd->request->tag);
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if (!WARN_ON(off > logbuf_len - 58)) {
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off += scnprintf(logbuf + off, logbuf_len - off,
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"CDB[%02x]: ", k);
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hex_dump_to_buffer(&cmd->cmnd[k], linelen,
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16, 1, logbuf + off,
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logbuf_len - off, false);
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}
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dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s",
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logbuf);
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scsi_log_release_buffer(logbuf);
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}
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return;
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}
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if (!WARN_ON(off > logbuf_len - 49)) {
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off += scnprintf(logbuf + off, logbuf_len - off, " ");
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hex_dump_to_buffer(cmd->cmnd, cmd->cmd_len, 16, 1,
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logbuf + off, logbuf_len - off,
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false);
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}
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out_printk:
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dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
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scsi_log_release_buffer(logbuf);
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}
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EXPORT_SYMBOL(scsi_print_command);
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static size_t
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scsi_format_extd_sense(char *buffer, size_t buf_len,
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unsigned char asc, unsigned char ascq)
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{
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size_t off = 0;
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const char *extd_sense_fmt = NULL;
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const char *extd_sense_str = scsi_extd_sense_format(asc, ascq,
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&extd_sense_fmt);
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if (extd_sense_str) {
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off = scnprintf(buffer, buf_len, "Add. Sense: %s",
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extd_sense_str);
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if (extd_sense_fmt)
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off += scnprintf(buffer + off, buf_len - off,
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"(%s%x)", extd_sense_fmt, ascq);
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} else {
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if (asc >= 0x80)
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off = scnprintf(buffer, buf_len, "<<vendor>>");
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off += scnprintf(buffer + off, buf_len - off,
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"ASC=0x%x ", asc);
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if (ascq >= 0x80)
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off += scnprintf(buffer + off, buf_len - off,
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"<<vendor>>");
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off += scnprintf(buffer + off, buf_len - off,
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"ASCQ=0x%x ", ascq);
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}
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return off;
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}
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static size_t
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scsi_format_sense_hdr(char *buffer, size_t buf_len,
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const struct scsi_sense_hdr *sshdr)
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{
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const char *sense_txt;
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size_t off;
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off = scnprintf(buffer, buf_len, "Sense Key : ");
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sense_txt = scsi_sense_key_string(sshdr->sense_key);
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if (sense_txt)
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off += scnprintf(buffer + off, buf_len - off,
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"%s ", sense_txt);
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else
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off += scnprintf(buffer + off, buf_len - off,
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"0x%x ", sshdr->sense_key);
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off += scnprintf(buffer + off, buf_len - off,
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scsi_sense_is_deferred(sshdr) ? "[deferred] " : "[current] ");
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if (sshdr->response_code >= 0x72)
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off += scnprintf(buffer + off, buf_len - off, "[descriptor] ");
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return off;
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}
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static void
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scsi_log_dump_sense(const struct scsi_device *sdev, const char *name, int tag,
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const unsigned char *sense_buffer, int sense_len)
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{
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char *logbuf;
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size_t logbuf_len;
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int i;
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logbuf = scsi_log_reserve_buffer(&logbuf_len);
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if (!logbuf)
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return;
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for (i = 0; i < sense_len; i += 16) {
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int len = min(sense_len - i, 16);
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size_t off;
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off = sdev_format_header(logbuf, logbuf_len,
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name, tag);
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hex_dump_to_buffer(&sense_buffer[i], len, 16, 1,
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logbuf + off, logbuf_len - off,
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false);
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dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
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}
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scsi_log_release_buffer(logbuf);
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}
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static void
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scsi_log_print_sense_hdr(const struct scsi_device *sdev, const char *name,
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int tag, const struct scsi_sense_hdr *sshdr)
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{
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char *logbuf;
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size_t off, logbuf_len;
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logbuf = scsi_log_reserve_buffer(&logbuf_len);
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if (!logbuf)
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return;
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off = sdev_format_header(logbuf, logbuf_len, name, tag);
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off += scsi_format_sense_hdr(logbuf + off, logbuf_len - off, sshdr);
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dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
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scsi_log_release_buffer(logbuf);
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logbuf = scsi_log_reserve_buffer(&logbuf_len);
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if (!logbuf)
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return;
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off = sdev_format_header(logbuf, logbuf_len, name, tag);
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off += scsi_format_extd_sense(logbuf + off, logbuf_len - off,
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sshdr->asc, sshdr->ascq);
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dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
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scsi_log_release_buffer(logbuf);
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}
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static void
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scsi_log_print_sense(const struct scsi_device *sdev, const char *name, int tag,
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const unsigned char *sense_buffer, int sense_len)
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{
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struct scsi_sense_hdr sshdr;
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if (scsi_normalize_sense(sense_buffer, sense_len, &sshdr))
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scsi_log_print_sense_hdr(sdev, name, tag, &sshdr);
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else
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scsi_log_dump_sense(sdev, name, tag, sense_buffer, sense_len);
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}
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/*
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* Print normalized SCSI sense header with a prefix.
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*/
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void
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scsi_print_sense_hdr(const struct scsi_device *sdev, const char *name,
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const struct scsi_sense_hdr *sshdr)
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{
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scsi_log_print_sense_hdr(sdev, name, -1, sshdr);
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}
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EXPORT_SYMBOL(scsi_print_sense_hdr);
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/* Normalize and print sense buffer with name prefix */
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void __scsi_print_sense(const struct scsi_device *sdev, const char *name,
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const unsigned char *sense_buffer, int sense_len)
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{
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scsi_log_print_sense(sdev, name, -1, sense_buffer, sense_len);
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}
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EXPORT_SYMBOL(__scsi_print_sense);
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/* Normalize and print sense buffer in SCSI command */
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void scsi_print_sense(const struct scsi_cmnd *cmd)
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{
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scsi_log_print_sense(cmd->device, scmd_name(cmd), cmd->request->tag,
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cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
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}
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EXPORT_SYMBOL(scsi_print_sense);
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void scsi_print_result(const struct scsi_cmnd *cmd, const char *msg,
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int disposition)
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{
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char *logbuf;
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size_t off, logbuf_len;
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const char *mlret_string = scsi_mlreturn_string(disposition);
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const char *hb_string = scsi_hostbyte_string(cmd->result);
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const char *db_string = scsi_driverbyte_string(cmd->result);
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logbuf = scsi_log_reserve_buffer(&logbuf_len);
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if (!logbuf)
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return;
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off = sdev_format_header(logbuf, logbuf_len,
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scmd_name(cmd), cmd->request->tag);
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if (off >= logbuf_len)
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goto out_printk;
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if (msg) {
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off += scnprintf(logbuf + off, logbuf_len - off,
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"%s: ", msg);
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if (WARN_ON(off >= logbuf_len))
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goto out_printk;
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}
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if (mlret_string)
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off += scnprintf(logbuf + off, logbuf_len - off,
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"%s ", mlret_string);
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else
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off += scnprintf(logbuf + off, logbuf_len - off,
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"UNKNOWN(0x%02x) ", disposition);
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if (WARN_ON(off >= logbuf_len))
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goto out_printk;
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off += scnprintf(logbuf + off, logbuf_len - off, "Result: ");
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if (WARN_ON(off >= logbuf_len))
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goto out_printk;
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if (hb_string)
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off += scnprintf(logbuf + off, logbuf_len - off,
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"hostbyte=%s ", hb_string);
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else
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off += scnprintf(logbuf + off, logbuf_len - off,
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"hostbyte=0x%02x ", host_byte(cmd->result));
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if (WARN_ON(off >= logbuf_len))
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goto out_printk;
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if (db_string)
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off += scnprintf(logbuf + off, logbuf_len - off,
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"driverbyte=%s", db_string);
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else
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off += scnprintf(logbuf + off, logbuf_len - off,
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"driverbyte=0x%02x", driver_byte(cmd->result));
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out_printk:
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dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
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scsi_log_release_buffer(logbuf);
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}
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EXPORT_SYMBOL(scsi_print_result);
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