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    Subject[PATCH RFC v2 09/18] scsi: ipr: Support reserved commands
    Date
    Support a single reserved command for ATA internal commands. We also
    add SHT reserved_queuecommand callback to support queueing those internal
    commands.

    Signed-off-by: John Garry <john.garry@huawei.com>
    ---
    drivers/scsi/ipr.c | 17 ++++++++++++++++-
    1 file changed, 16 insertions(+), 1 deletion(-)

    diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
    index 256ec6d08c16..4f4cf39cd2bc 100644
    --- a/drivers/scsi/ipr.c
    +++ b/drivers/scsi/ipr.c
    @@ -6740,6 +6740,19 @@ static const char *ipr_ioa_info(struct Scsi_Host *host)
    return buffer;
    }

    +static int ipr_reserved_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
    +{
    + struct ata_queued_cmd *qc = (struct ata_queued_cmd *)scmd->host_scribble;
    + struct ata_port *ap = qc->ap;
    + int ret;
    +
    + /* We're only going to be seeing ATA internal commands */
    + spin_lock_irq(ap->lock);
    + ret = ata_sas_queuecmd(scmd, ap);
    + spin_unlock_irq(ap->lock);
    + return ret;
    +}
    +
    static struct scsi_host_template driver_template = {
    .module = THIS_MODULE,
    .name = "IPR",
    @@ -6749,6 +6762,7 @@ static struct scsi_host_template driver_template = {
    .compat_ioctl = ipr_ioctl,
    #endif
    .queuecommand = ipr_queuecommand,
    + .reserved_queuecommand = ipr_reserved_queuecommand,
    .dma_need_drain = ata_scsi_dma_need_drain,
    .eh_abort_handler = ipr_eh_abort,
    .eh_device_reset_handler = ipr_eh_dev_reset,
    @@ -9991,7 +10005,8 @@ static void ipr_init_ioa_cfg(struct ipr_ioa_cfg *ioa_cfg,

    host->unique_id = host->host_no;
    host->max_cmd_len = IPR_MAX_CDB_LEN;
    - host->can_queue = ioa_cfg->max_cmds;
    + host->can_queue = ioa_cfg->max_cmds - 1;
    + host->nr_reserved_cmds = 1;
    pci_set_drvdata(pdev, ioa_cfg);

    for (i = 0; i < ARRAY_SIZE(ioa_cfg->hrrq); i++) {
    --
    2.26.2
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