drivers/scsi/scsi_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/seq_file.h>
   3 #include <scsi/scsi_cmnd.h>
   4 #include <scsi/scsi_dbg.h>
   5 #include "scsi_debugfs.h"
   6
   7 #define SCSI_CMD_FLAG_NAME(name) [ilog2(SCMD_##name)] = #name
   8 static const char *const scsi_cmd_flags[] = {
   9         SCSI_CMD_FLAG_NAME(TAGGED),
  10         SCSI_CMD_FLAG_NAME(UNCHECKED_ISA_DMA),
  11         SCSI_CMD_FLAG_NAME(INITIALIZED),
  12 };
  13 #undef SCSI_CMD_FLAG_NAME
  14
  15 static int scsi_flags_show(struct seq_file *m, const unsigned long flags,
  16                            const char *const *flag_name, int flag_name_count)
  17 {
  18         bool sep = false;
  19         int i;
  20
  21         for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
  22                 if (!(flags & BIT(i)))
  23                         continue;
  24                 if (sep)
  25                         seq_puts(m, "|");
  26                 sep = true;
  27                 if (i < flag_name_count && flag_name[i])
  28                         seq_puts(m, flag_name[i]);
  29                 else
  30                         seq_printf(m, "%d", i);
  31         }
  32         return 0;
  33 }
  34
  35 void scsi_show_rq(struct seq_file *m, struct request *rq)
  36 {
  37         struct scsi_cmnd *cmd = container_of(scsi_req(rq), typeof(*cmd), req);
  38         int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
  39         int timeout_ms = jiffies_to_msecs(rq->timeout);
  40         const u8 *const cdb = READ_ONCE(cmd->cmnd);
  41         char buf[80] = "(?)";
  42
  43         if (cdb)
  44                 __scsi_format_command(buf, sizeof(buf), cdb, cmd->cmd_len);
  45         seq_printf(m, ", .cmd=%s, .retries=%d, .result = %#x, .flags=", buf,
  46                    cmd->retries, cmd->result);
  47         scsi_flags_show(m, cmd->flags, scsi_cmd_flags,
  48                         ARRAY_SIZE(scsi_cmd_flags));
  49         seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago",
  50                    timeout_ms / 1000, timeout_ms % 1000,
  51                    alloc_ms / 1000, alloc_ms % 1000);
  52 }