drivers/s390/block/scm_blk.h

   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/genhd.h>
   8 #include <linux/list.h>
   9
  10 #include <asm/debug.h>
  11 #include <asm/eadm.h>
  12
  13 #define SCM_NR_PARTS 8
  14 #define SCM_QUEUE_DELAY 5
  15
  16 struct scm_blk_dev {
  17         struct tasklet_struct tasklet;
  18         struct request_queue *rq;
  19         struct gendisk *gendisk;
  20         struct scm_device *scmdev;
  21         spinlock_t rq_lock;     /* guard the request queue */
  22         spinlock_t lock;        /* guard the rest of the blockdev */
  23         atomic_t queued_reqs;
  24         enum {SCM_OPER, SCM_WR_PROHIBIT} state;
  25         struct list_head finished_requests;
  26 #ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
  27         struct list_head cluster_list;
  28 #endif
  29 };
  30
  31 struct scm_request {
  32         struct scm_blk_dev *bdev;
  33         struct aidaw *next_aidaw;
  34         struct request **request;
  35         struct aob *aob;
  36         struct list_head list;
  37         u8 retries;
  38         blk_status_t error;
  39 #ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
  40         struct {
  41                 enum {CLUSTER_NONE, CLUSTER_READ, CLUSTER_WRITE} state;
  42                 struct list_head list;
  43                 void **buf;
  44         } cluster;
  45 #endif
  46 };
  47
  48 #define to_aobrq(rq) container_of((void *) rq, struct aob_rq_header, data)
  49
  50 int scm_blk_dev_setup(struct scm_blk_dev *, struct scm_device *);
  51 void scm_blk_dev_cleanup(struct scm_blk_dev *);
  52 void scm_blk_set_available(struct scm_blk_dev *);
  53 void scm_blk_irq(struct scm_device *, void *, blk_status_t);
  54
  55 void scm_request_finish(struct scm_request *);
  56 void scm_request_requeue(struct scm_request *);
  57
  58 struct aidaw *scm_aidaw_fetch(struct scm_request *scmrq, unsigned int bytes);
  59
  60 int scm_drv_init(void);
  61 void scm_drv_cleanup(void);
  62
  63 #ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
  64 void __scm_free_rq_cluster(struct scm_request *);
  65 int __scm_alloc_rq_cluster(struct scm_request *);
  66 void scm_request_cluster_init(struct scm_request *);
  67 bool scm_reserve_cluster(struct scm_request *);
  68 void scm_release_cluster(struct scm_request *);
  69 void scm_blk_dev_cluster_setup(struct scm_blk_dev *);
  70 bool scm_need_cluster_request(struct scm_request *);
  71 void scm_initiate_cluster_request(struct scm_request *);
  72 void scm_cluster_request_irq(struct scm_request *);
  73 bool scm_test_cluster_request(struct scm_request *);
  74 bool scm_cluster_size_valid(void);
  75 #else /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */
  76 static inline void __scm_free_rq_cluster(struct scm_request *scmrq) {}
  77 static inline int __scm_alloc_rq_cluster(struct scm_request *scmrq)
  78 {
  79         return 0;
  80 }
  81 static inline void scm_request_cluster_init(struct scm_request *scmrq) {}
  82 static inline bool scm_reserve_cluster(struct scm_request *scmrq)
  83 {
  84         return true;
  85 }
  86 static inline void scm_release_cluster(struct scm_request *scmrq) {}
  87 static inline void scm_blk_dev_cluster_setup(struct scm_blk_dev *bdev) {}
  88 static inline bool scm_need_cluster_request(struct scm_request *scmrq)
  89 {
  90         return false;
  91 }
  92 static inline void scm_initiate_cluster_request(struct scm_request *scmrq) {}
  93 static inline void scm_cluster_request_irq(struct scm_request *scmrq) {}
  94 static inline bool scm_test_cluster_request(struct scm_request *scmrq)
  95 {
  96         return false;
  97 }
  98 static inline bool scm_cluster_size_valid(void)
  99 {
 100         return true;
 101 }
 102 #endif /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */
 103
 104 extern debug_info_t *scm_debug;
 105
 106 #define SCM_LOG(imp, txt) do {                                  \
 107                 debug_text_event(scm_debug, imp, txt);          \
 108         } while (0)
 109
 110 static inline void SCM_LOG_HEX(int level, void *data, int length)
 111 {
 112         if (!debug_level_enabled(scm_debug, level))
 113                 return;
 114         while (length > 0) {
 115                 debug_event(scm_debug, level, data, length);
 116                 length -= scm_debug->buf_size;
 117                 data += scm_debug->buf_size;
 118         }
 119 }
 120
 121 static inline void SCM_LOG_STATE(int level, struct scm_device *scmdev)
 122 {
 123         struct {
 124                 u64 address;
 125                 u8 oper_state;
 126                 u8 rank;
 127         } __packed data = {
 128                 .address = scmdev->address,
 129                 .oper_state = scmdev->attrs.oper_state,
 130                 .rank = scmdev->attrs.rank,
 131         };
 132
 133         SCM_LOG_HEX(level, &data, sizeof(data));
 134 }
 135
 136 #endif /* SCM_BLK_H */