xref: /openbmc/linux/drivers/s390/block/scm_blk.h (revision 5a244f48)
1 #ifndef SCM_BLK_H
2 #define SCM_BLK_H
3 
4 #include <linux/interrupt.h>
5 #include <linux/spinlock.h>
6 #include <linux/blkdev.h>
7 #include <linux/blk-mq.h>
8 #include <linux/genhd.h>
9 #include <linux/list.h>
10 
11 #include <asm/debug.h>
12 #include <asm/eadm.h>
13 
14 #define SCM_NR_PARTS 8
15 #define SCM_QUEUE_DELAY 5
16 
17 struct scm_blk_dev {
18 	struct request_queue *rq;
19 	struct gendisk *gendisk;
20 	struct blk_mq_tag_set tag_set;
21 	struct scm_device *scmdev;
22 	spinlock_t lock;
23 	atomic_t queued_reqs;
24 	enum {SCM_OPER, SCM_WR_PROHIBIT} state;
25 	struct list_head finished_requests;
26 };
27 
28 struct scm_request {
29 	struct scm_blk_dev *bdev;
30 	struct aidaw *next_aidaw;
31 	struct request **request;
32 	struct aob *aob;
33 	struct list_head list;
34 	u8 retries;
35 	blk_status_t error;
36 };
37 
38 #define to_aobrq(rq) container_of((void *) rq, struct aob_rq_header, data)
39 
40 int scm_blk_dev_setup(struct scm_blk_dev *, struct scm_device *);
41 void scm_blk_dev_cleanup(struct scm_blk_dev *);
42 void scm_blk_set_available(struct scm_blk_dev *);
43 void scm_blk_irq(struct scm_device *, void *, blk_status_t);
44 
45 struct aidaw *scm_aidaw_fetch(struct scm_request *scmrq, unsigned int bytes);
46 
47 int scm_drv_init(void);
48 void scm_drv_cleanup(void);
49 
50 extern debug_info_t *scm_debug;
51 
52 #define SCM_LOG(imp, txt) do {					\
53 		debug_text_event(scm_debug, imp, txt);		\
54 	} while (0)
55 
56 static inline void SCM_LOG_HEX(int level, void *data, int length)
57 {
58 	if (!debug_level_enabled(scm_debug, level))
59 		return;
60 	while (length > 0) {
61 		debug_event(scm_debug, level, data, length);
62 		length -= scm_debug->buf_size;
63 		data += scm_debug->buf_size;
64 	}
65 }
66 
67 static inline void SCM_LOG_STATE(int level, struct scm_device *scmdev)
68 {
69 	struct {
70 		u64 address;
71 		u8 oper_state;
72 		u8 rank;
73 	} __packed data = {
74 		.address = scmdev->address,
75 		.oper_state = scmdev->attrs.oper_state,
76 		.rank = scmdev->attrs.rank,
77 	};
78 
79 	SCM_LOG_HEX(level, &data, sizeof(data));
80 }
81 
82 #endif /* SCM_BLK_H */
83