Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Martin Schwidefsky:
 "The second patch set for the 4.14 merge window:

   - Convert the dasd device driver to the blk-mq interface.

   - Provide three zcrypt interfaces for vfio_ap. These will be required
     for KVM guest access to the crypto cards attached via the AP bus.

   - A couple of memory management bug fixes."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/dasd: blk-mq conversion
  s390/mm: use a single lock for the fields in mm_context_t
  s390/mm: fix race on mm->context.flush_mm
  s390/mm: fix local TLB flushing vs. detach of an mm address space
  s390/zcrypt: externalize AP queue interrupt control
  s390/zcrypt: externalize AP config info query
  s390/zcrypt: externalize test AP queue
  s390/mm: use VM_BUG_ON in crst_table_[upgrade|downgrade]

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index f9e25fc03d6b..db470bd10175 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -56,6 +56,7 @@
 #include <asm/dasd.h>
 #include <asm/idals.h>
 #include <linux/bitops.h>
+#include <linux/blk-mq.h>
 
 /* DASD discipline magic */
 #define DASD_ECKD_MAGIC 0xC5C3D2C4
@@ -185,6 +186,7 @@ struct dasd_ccw_req {
 	char status;			/* status of this request */
 	short retries;			/* A retry counter */
 	unsigned long flags;        	/* flags of this request */
+	struct dasd_queue *dq;
 
 	/* ... and how */
 	unsigned long starttime;	/* jiffies time of request start */
@@ -248,6 +250,16 @@ struct dasd_ccw_req {
 #define DASD_CQR_SUPPRESS_IL	6	/* Suppress 'Incorrect Length' error */
 #define DASD_CQR_SUPPRESS_CR	7	/* Suppress 'Command Reject' error */
 
+/*
+ * There is no reliable way to determine the number of available CPUs on
+ * LPAR but there is no big performance difference between 1 and the
+ * maximum CPU number.
+ * 64 is a good trade off performance wise.
+ */
+#define DASD_NR_HW_QUEUES 64
+#define DASD_MAX_LCU_DEV 256
+#define DASD_REQ_PER_DEV 4
+
 /* Signature for error recovery functions. */
 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
 
@@ -539,6 +551,7 @@ struct dasd_block {
 	struct gendisk *gdp;
 	struct request_queue *request_queue;
 	spinlock_t request_queue_lock;
+	struct blk_mq_tag_set tag_set;
 	struct block_device *bdev;
 	atomic_t open_count;
 
@@ -563,6 +576,10 @@ struct dasd_attention_data {
 	__u8 lpum;
 };
 
+struct dasd_queue {
+	spinlock_t lock;
+};
+
 /* reasons why device (ccw_device_start) was stopped */
 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
@@ -731,7 +748,7 @@ void dasd_free_device(struct dasd_device *);
 struct dasd_block *dasd_alloc_block(void);
 void dasd_free_block(struct dasd_block *);
 
-enum blk_eh_timer_return dasd_times_out(struct request *req);
+enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved);
 
 void dasd_enable_device(struct dasd_device *);
 void dasd_set_target_state(struct dasd_device *, int);