drivers/s390/block/scm_blk.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef SCM_BLK_H
   3 #define SCM_BLK_H
   4
   5 #include <linux/interrupt.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/blkdev.h>
   8 #include <linux/blk-mq.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         debug_event(scm_debug, level, data, length);
  59 }
  60
  61 static inline void SCM_LOG_STATE(int level, struct scm_device *scmdev)
  62 {
  63         struct {
  64                 u64 address;
  65                 u8 oper_state;
  66                 u8 rank;
  67         } __packed data = {
  68                 .address = scmdev->address,
  69                 .oper_state = scmdev->attrs.oper_state,
  70                 .rank = scmdev->attrs.rank,
  71         };
  72
  73         SCM_LOG_HEX(level, &data, sizeof(data));
  74 }
  75
  76 #endif /* SCM_BLK_H */