From 1cee2975bbabd89df1097c354867192106b058ea Mon Sep 17 00:00:00 2001 From: Stefan Haberland Date: Wed, 5 Apr 2023 16:20:12 +0200 Subject: s390/dasd: add autoquiesce feature Add the internal logic to check for autoquiesce triggers and handle them. Quiesce and resume are functions that tell Linux to stop/resume issuing I/Os to a specific DASD. The DASD driver allows a manual quiesce/resume via ioctl. Autoquiesce will define an amount of triggers that will lead to an automatic quiesce if a certain event occurs. There is no automatic resume. All events will be reported via DASD Extended Error Reporting (EER) if configured. Signed-off-by: Stefan Haberland Reviewed-by: Jan Hoeppner Reviewed-by: Halil Pasic Link: https://lore.kernel.org/r/20230405142017.2446986-3-sth@linux.ibm.com Signed-off-by: Jens Axboe --- arch/s390/include/uapi/asm/dasd.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/s390') diff --git a/arch/s390/include/uapi/asm/dasd.h b/arch/s390/include/uapi/asm/dasd.h index 93d1ccd3304c..9c49c3d67cd5 100644 --- a/arch/s390/include/uapi/asm/dasd.h +++ b/arch/s390/include/uapi/asm/dasd.h @@ -78,6 +78,7 @@ typedef struct dasd_information2_t { * 0x040: give access to raw eckd data * 0x080: enable discard support * 0x100: enable autodisable for IFCC errors (default) + * 0x200: enable requeue of all requests on autoquiesce */ #define DASD_FEATURE_READONLY 0x001 #define DASD_FEATURE_USEDIAG 0x002 @@ -88,6 +89,7 @@ typedef struct dasd_information2_t { #define DASD_FEATURE_USERAW 0x040 #define DASD_FEATURE_DISCARD 0x080 #define DASD_FEATURE_PATH_AUTODISABLE 0x100 +#define DASD_FEATURE_REQUEUEQUIESCE 0x200 #define DASD_FEATURE_DEFAULT DASD_FEATURE_PATH_AUTODISABLE #define DASD_PARTN_BITS 2 -- cgit v1.2.3