drivers/scsi/scsi_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/bitops.h>
   3 #include <linux/seq_file.h>
   4 #include <scsi/scsi_cmnd.h>
   5 #include <scsi/scsi_dbg.h>
   6 #include "scsi_debugfs.h"
   7
   8 #define SCSI_CMD_FLAG_NAME(name)[const_ilog2(SCMD_##name)] = #name
   9 static const char *const scsi_cmd_flags[] = {
  10         SCSI_CMD_FLAG_NAME(TAGGED),
  11         SCSI_CMD_FLAG_NAME(UNCHECKED_ISA_DMA),
  12         SCSI_CMD_FLAG_NAME(INITIALIZED),
  13 };
  14 #undef SCSI_CMD_FLAG_NAME
  15
  16 static int scsi_flags_show(struct seq_file *m, const unsigned long flags,
  17                            const char *const *flag_name, int flag_name_count)
  18 {
  19         bool sep = false;
  20         int i;
  21
  22         for_each_set_bit(i, &flags, BITS_PER_LONG) {
  23                 if (sep)
  24                         seq_puts(m, "|");
  25                 sep = true;
  26                 if (i < flag_name_count && flag_name[i])
  27                         seq_puts(m, flag_name[i]);
  28                 else
  29                         seq_printf(m, "%d", i);
  30         }
  31         return 0;
  32 }
  33
  34 void scsi_show_rq(struct seq_file *m, struct request *rq)
  35 {
  36         struct scsi_cmnd *cmd = container_of(scsi_req(rq), typeof(*cmd), req);
  37         int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
  38         int timeout_ms = jiffies_to_msecs(rq->timeout);
  39         const u8 *const cdb = READ_ONCE(cmd->cmnd);
  40         char buf[80] = "(?)";
  41
  42         if (cdb)
  43                 __scsi_format_command(buf, sizeof(buf), cdb, cmd->cmd_len);
  44         seq_printf(m, ", .cmd=%s, .retries=%d, .result = %#x, .flags=", buf,
  45                    cmd->retries, cmd->result);
  46         scsi_flags_show(m, cmd->flags, scsi_cmd_flags,
  47                         ARRAY_SIZE(scsi_cmd_flags));
  48         seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago",
  49                    timeout_ms / 1000, timeout_ms % 1000,
  50                    alloc_ms / 1000, alloc_ms % 1000);
  51 }