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Commit 24c20f10 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarRobert Elliott <elliott@hp.com>
Tested-by: default avatarRobert Elliott <elliott@hp.com>
parent 8e4a5da6

drivers/scsi/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -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

drivers/scsi/scsi.c

+4 −0
Original line number Diff line number Diff line
@@ -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)