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scsi: add a CONFIG_SCSI_MQ_DEFAULT option 

Add a Kconfig option to enable the blk-mq path for SCSI by default
to ease testing and deployment in setups that know they benefit
from blk-mq.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Robert Elliott <elliott@hp.com>
Tested-by: Robert Elliott <elliott@hp.com>
This commit is contained in:
Christoph Hellwig 2014-09-30 16:43:46 +02:00
parent 8e4a5da69c
commit 24c20f1058
2 changed files with 15 additions and 0 deletions
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11
drivers/scsi/Kconfig
View File

@ -45,6 +45,17 @@ config SCSI_NETLINK
default n
select NET
config SCSI_MQ_DEFAULT
bool "SCSI: use blk-mq I/O path by default"
depends on SCSI
---help---
This option enables the new blk-mq based I/O path for SCSI
devices by default. With the option the scsi_mod.use_blk_mq
module/boot option defaults to Y, without it to N, but it can
still be overriden either way.
If unsure say N.
config SCSI_PROC_FS
bool "legacy /proc/scsi/ support"
depends on SCSI && PROC_FS

4
drivers/scsi/scsi.c
View File

@ -1367,7 +1367,11 @@ MODULE_LICENSE("GPL");
module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels");
#ifdef CONFIG_SCSI_MQ_DEFAULT
bool scsi_use_blk_mq = true;
#else
bool scsi_use_blk_mq = false;
#endif
module_param_named(use_blk_mq, scsi_use_blk_mq, bool, S_IWUSR | S_IRUGO);
static int __init init_scsi(void)