s390/dasd: add query PPRC function
Add function to query the Peer-to-Peer-Remote-Copy (PPRC) state of a
device by reading the related structure through a read subsystem data call.
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Link: https://lore.kernel.org/r/20220920192616.808070-3-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h
index a91b265..ecf25b9 100644
--- a/drivers/s390/block/dasd_eckd.h
+++ b/drivers/s390/block/dasd_eckd.h
@@ -66,10 +66,16 @@
* Perform Subsystem Function / Sub-Orders
*/
#define PSF_SUBORDER_QHA 0x1C /* Query Host Access */
+#define PSF_SUBORDER_PPRCEQ 0x50 /* PPRC Extended Query */
#define PSF_SUBORDER_VSQ 0x52 /* Volume Storage Query */
#define PSF_SUBORDER_LCQ 0x53 /* Logical Configuration Query */
/*
+ * PPRC Extended Query Scopes
+ */
+#define PPRCEQ_SCOPE_4 0x04 /* Scope 4 for PPRC Extended Query */
+
+/*
* CUIR response condition codes
*/
#define PSF_CUIR_INVALID 0x00
