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Provide information in debugfs about SCSI error handling to make it easier to debug the SCSI error handler. Additionally, report the maximum number of retries in debugfs (.allowed). Reviewed-by: John Garry <john.g.garry@oracle.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Damien Le Moal <damien.lemoal@opensource.wdc.com> Cc: Mike Christie <michael.christie@oracle.com> Cc: Ming Lei <ming.lei@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20230822163811.219569-1-bvanassche@acm.org Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bitops.h>
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#include <linux/seq_file.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_host.h>
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#include "scsi_debugfs.h"
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#define SCSI_CMD_FLAG_NAME(name)[const_ilog2(SCMD_##name)] = #name
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static const char *const scsi_cmd_flags[] = {
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SCSI_CMD_FLAG_NAME(TAGGED),
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SCSI_CMD_FLAG_NAME(INITIALIZED),
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SCSI_CMD_FLAG_NAME(LAST),
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};
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#undef SCSI_CMD_FLAG_NAME
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static int scsi_flags_show(struct seq_file *m, const unsigned long flags,
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const char *const *flag_name, int flag_name_count)
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{
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bool sep = false;
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int i;
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for_each_set_bit(i, &flags, BITS_PER_LONG) {
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if (sep)
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seq_puts(m, "|");
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sep = true;
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if (i < flag_name_count && flag_name[i])
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seq_puts(m, flag_name[i]);
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else
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seq_printf(m, "%d", i);
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}
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return 0;
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}
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void scsi_show_rq(struct seq_file *m, struct request *rq)
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{
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struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq), *cmd2;
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struct Scsi_Host *shost = cmd->device->host;
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int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
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int timeout_ms = jiffies_to_msecs(rq->timeout);
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const char *list_info = NULL;
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char buf[80] = "(?)";
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spin_lock_irq(shost->host_lock);
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list_for_each_entry(cmd2, &shost->eh_abort_list, eh_entry) {
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if (cmd == cmd2) {
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list_info = "on eh_abort_list";
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goto unlock;
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}
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}
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list_for_each_entry(cmd2, &shost->eh_cmd_q, eh_entry) {
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if (cmd == cmd2) {
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list_info = "on eh_cmd_q";
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goto unlock;
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}
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}
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unlock:
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spin_unlock_irq(shost->host_lock);
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__scsi_format_command(buf, sizeof(buf), cmd->cmnd, cmd->cmd_len);
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seq_printf(m, ", .cmd=%s, .retries=%d, .allowed=%d, .result = %#x, %s%s.flags=",
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buf, cmd->retries, cmd->allowed, cmd->result,
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list_info ? : "", list_info ? ", " : "");
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scsi_flags_show(m, cmd->flags, scsi_cmd_flags,
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ARRAY_SIZE(scsi_cmd_flags));
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seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago",
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timeout_ms / 1000, timeout_ms % 1000,
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alloc_ms / 1000, alloc_ms % 1000);
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}
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