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path: root/drivers/s390/block/scm_blk.h
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Diffstat (limited to 'drivers/s390/block/scm_blk.h')
-rw-r--r--drivers/s390/block/scm_blk.h117
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/s390/block/scm_blk.h b/drivers/s390/block/scm_blk.h
new file mode 100644
index 00000000000..7ac6bad919e
--- /dev/null
+++ b/drivers/s390/block/scm_blk.h
@@ -0,0 +1,117 @@
+#ifndef SCM_BLK_H
+#define SCM_BLK_H
+
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/blkdev.h>
+#include <linux/genhd.h>
+#include <linux/list.h>
+
+#include <asm/debug.h>
+#include <asm/eadm.h>
+
+#define SCM_NR_PARTS 8
+#define SCM_QUEUE_DELAY 5
+
+struct scm_blk_dev {
+ struct tasklet_struct tasklet;
+ struct request_queue *rq;
+ struct gendisk *gendisk;
+ struct scm_device *scmdev;
+ spinlock_t rq_lock; /* guard the request queue */
+ spinlock_t lock; /* guard the rest of the blockdev */
+ atomic_t queued_reqs;
+ struct list_head finished_requests;
+#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
+ struct list_head cluster_list;
+#endif
+};
+
+struct scm_request {
+ struct scm_blk_dev *bdev;
+ struct request *request;
+ struct aidaw *aidaw;
+ struct aob *aob;
+ struct list_head list;
+ u8 retries;
+ int error;
+#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
+ struct {
+ enum {CLUSTER_NONE, CLUSTER_READ, CLUSTER_WRITE} state;
+ struct list_head list;
+ void **buf;
+ } cluster;
+#endif
+};
+
+#define to_aobrq(rq) container_of((void *) rq, struct aob_rq_header, data)
+
+int scm_blk_dev_setup(struct scm_blk_dev *, struct scm_device *);
+void scm_blk_dev_cleanup(struct scm_blk_dev *);
+void scm_blk_irq(struct scm_device *, void *, int);
+
+void scm_request_finish(struct scm_request *);
+void scm_request_requeue(struct scm_request *);
+
+int scm_drv_init(void);
+void scm_drv_cleanup(void);
+
+#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
+void __scm_free_rq_cluster(struct scm_request *);
+int __scm_alloc_rq_cluster(struct scm_request *);
+void scm_request_cluster_init(struct scm_request *);
+bool scm_reserve_cluster(struct scm_request *);
+void scm_release_cluster(struct scm_request *);
+void scm_blk_dev_cluster_setup(struct scm_blk_dev *);
+bool scm_need_cluster_request(struct scm_request *);
+void scm_initiate_cluster_request(struct scm_request *);
+void scm_cluster_request_irq(struct scm_request *);
+bool scm_test_cluster_request(struct scm_request *);
+bool scm_cluster_size_valid(void);
+#else
+#define __scm_free_rq_cluster(scmrq) {}
+#define __scm_alloc_rq_cluster(scmrq) 0
+#define scm_request_cluster_init(scmrq) {}
+#define scm_reserve_cluster(scmrq) true
+#define scm_release_cluster(scmrq) {}
+#define scm_blk_dev_cluster_setup(bdev) {}
+#define scm_need_cluster_request(scmrq) false
+#define scm_initiate_cluster_request(scmrq) {}
+#define scm_cluster_request_irq(scmrq) {}
+#define scm_test_cluster_request(scmrq) false
+#define scm_cluster_size_valid() true
+#endif
+
+extern debug_info_t *scm_debug;
+
+#define SCM_LOG(imp, txt) do { \
+ debug_text_event(scm_debug, imp, txt); \
+ } while (0)
+
+static inline void SCM_LOG_HEX(int level, void *data, int length)
+{
+ if (level > scm_debug->level)
+ return;
+ while (length > 0) {
+ debug_event(scm_debug, level, data, length);
+ length -= scm_debug->buf_size;
+ data += scm_debug->buf_size;
+ }
+}
+
+static inline void SCM_LOG_STATE(int level, struct scm_device *scmdev)
+{
+ struct {
+ u64 address;
+ u8 oper_state;
+ u8 rank;
+ } __packed data = {
+ .address = scmdev->address,
+ .oper_state = scmdev->attrs.oper_state,
+ .rank = scmdev->attrs.rank,
+ };
+
+ SCM_LOG_HEX(level, &data, sizeof(data));
+}
+
+#endif /* SCM_BLK_H */