From 24c20f10583647e30afe87b6f6d5e14bc7b1cbc6 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 30 Sep 2014 16:43:46 +0200 Subject: [PATCH] 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 Reviewed-by: Martin K. Petersen Reviewed-by: Robert Elliott Tested-by: Robert Elliott --- drivers/scsi/Kconfig | 11 +++++++++++ drivers/scsi/scsi.c | 4 ++++ 2 files changed, 15 insertions(+) diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 18a3358eb1d4..71b0877245cb 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -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 diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 1423cb17fbfd..79c77b485a67 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -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) -- 2.20.1