diff options
| -rw-r--r-- | drivers/scsi/hosts.c | 1 | ||||
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 3 | ||||
| -rw-r--r-- | include/scsi/scsi_host.h | 21 |
3 files changed, 23 insertions, 2 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index eb224a338fa2..8b7f5fafa9e0 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -436,6 +436,7 @@ struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int priv shost->hostt = sht; shost->this_id = sht->this_id; shost->can_queue = sht->can_queue; + shost->nr_reserved_cmds = sht->nr_reserved_cmds; shost->sg_tablesize = sht->sg_tablesize; shost->sg_prot_tablesize = sht->sg_prot_tablesize; shost->cmd_per_lun = sht->cmd_per_lun; diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index d7e42293b864..d52bbbe5a357 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2083,7 +2083,8 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost) tag_set->ops = &scsi_mq_ops_no_commit; tag_set->nr_hw_queues = shost->nr_hw_queues ? : 1; tag_set->nr_maps = shost->nr_maps ? : 1; - tag_set->queue_depth = shost->can_queue; + tag_set->queue_depth = shost->can_queue + shost->nr_reserved_cmds; + tag_set->reserved_tags = shost->nr_reserved_cmds; tag_set->cmd_size = cmd_size; tag_set->numa_node = dev_to_node(shost->dma_dev); if (shost->hostt->tag_alloc_policy_rr) diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index f5a243261236..7b8f144ccf7d 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -375,11 +375,20 @@ struct scsi_host_template { /* * This determines if we will use a non-interrupt driven * or an interrupt driven scheme. It is set to the maximum number - * of simultaneous commands a single hw queue in HBA will accept. + * of simultaneous commands a single hw queue in HBA will accept + * excluding internal commands. */ int can_queue; /* + * This determines how many commands the HBA will set aside + * for internal commands. This number will be added to + * @can_queue to calculate the maximum number of simultaneous + * commands sent to the host. + */ + int nr_reserved_cmds; + + /* * In many instances, especially where disconnect / reconnect are * supported, our host also has an ID on the SCSI bus. If this is * the case, then it must be reserved. Please set this_id to -1 if @@ -611,7 +620,17 @@ struct Scsi_Host { unsigned short max_cmd_len; int this_id; + + /* + * Number of commands this host can handle at the same time. + * This excludes reserved commands as specified by nr_reserved_cmds. + */ int can_queue; + /* + * Number of reserved commands to allocate, if any. + */ + unsigned int nr_reserved_cmds; + short cmd_per_lun; short unsigned int sg_tablesize; short unsigned int sg_prot_tablesize; |