// SPDX-License-Identifier: GPL-2.0
#include <linux/bitops.h>
#include <linux/cleanup.h>
#include <linux/seq_file.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_host.h>
#include "scsi_debugfs.h"

#define SCSI_CMD_FLAG_NAME(name)[const_ilog2(SCMD_##name)] = #name
static const char *const scsi_cmd_flags[] = {
        SCSI_CMD_FLAG_NAME(TAGGED),
        SCSI_CMD_FLAG_NAME(INITIALIZED),
        SCSI_CMD_FLAG_NAME(LAST),
};
#undef SCSI_CMD_FLAG_NAME

static int scsi_flags_show(struct seq_file *m, const unsigned long flags,
                           const char *const *flag_name, int flag_name_count)
{
        bool sep = false;
        int i;

        for_each_set_bit(i, &flags, BITS_PER_LONG) {
                if (sep)
                        seq_puts(m, "|");
                sep = true;
                if (i < flag_name_count && flag_name[i])
                        seq_puts(m, flag_name[i]);
                else
                        seq_printf(m, "%d", i);
        }
        return 0;
}

static const char *scsi_cmd_list_info(struct scsi_cmnd *cmd)
{
        struct Scsi_Host *shost = cmd->device->host;
        struct scsi_cmnd *cmd2;

        guard(spinlock_irq)(shost->host_lock);

        list_for_each_entry(cmd2, &shost->eh_abort_list, eh_entry)
                if (cmd == cmd2)
                        return "on eh_abort_list";

        list_for_each_entry(cmd2, &shost->eh_cmd_q, eh_entry)
                if (cmd == cmd2)
                        return "on eh_cmd_q";

        return NULL;
}

void scsi_show_rq(struct seq_file *m, struct request *rq)
{
        struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
        int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
        int timeout_ms = jiffies_to_msecs(rq->timeout);
        char buf[80] = "(?)";

        if (cmd->flags & SCMD_INITIALIZED) {
                const char *list_info = scsi_cmd_list_info(cmd);

                __scsi_format_command(buf, sizeof(buf), cmd->cmnd, cmd->cmd_len);
                seq_printf(m, ", .cmd=%s, .retries=%d, .allowed=%d, .result = %#x%s%s",
                           buf, cmd->retries, cmd->allowed, cmd->result,
                           list_info ? ", " : "", list_info ? : "");
                seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago",
                           timeout_ms / 1000, timeout_ms % 1000,
                           alloc_ms / 1000, alloc_ms % 1000);
        }
        seq_printf(m, ", .flags=");
        scsi_flags_show(m, cmd->flags, scsi_cmd_flags,
                        ARRAY_SIZE(scsi_cmd_flags));
}