diff options
Diffstat (limited to 'drivers/scsi/hosts.c')
| -rw-r--r-- | drivers/scsi/hosts.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 3771e59a9fae..f02dcc875a09 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -563,6 +563,38 @@ struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost) } EXPORT_SYMBOL(scsi_host_get); +struct scsi_host_mq_in_flight { + int cnt; +}; + +static void scsi_host_check_in_flight(struct request *rq, void *data, + bool reserved) +{ + struct scsi_host_mq_in_flight *in_flight = data; + + if (blk_mq_request_started(rq)) + in_flight->cnt++; +} + +/** + * scsi_host_busy - Return the host busy counter + * @shost: Pointer to Scsi_Host to inc. + **/ +int scsi_host_busy(struct Scsi_Host *shost) +{ + struct scsi_host_mq_in_flight in_flight = { + .cnt = 0, + }; + + if (!shost->use_blk_mq) + return atomic_read(&shost->host_busy); + + blk_mq_tagset_busy_iter(&shost->tag_set, scsi_host_check_in_flight, + &in_flight); + return in_flight.cnt; +} +EXPORT_SYMBOL(scsi_host_busy); + /** * scsi_host_put - dec a Scsi_Host ref count * @shost: Pointer to Scsi_Host to dec. |