LXR linux/drivers/scsi/scsi

   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)[const_ilog2(SCMD_##name)] = #name
   8static 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
  15static 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
  35void 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}
  53