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         struct list_head finished_requests;
  25 #ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
  26         struct list_head cluster_list;
  27 #endif
  28 };
  29
  30 struct scm_request {
  31         struct scm_blk_dev *bdev;
  32         struct request *request;
  33         struct aidaw *aidaw;
  34         struct aob *aob;
  35         struct list_head list;
  36         u8 retries;
  37         int error;
  38 #ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
  39         struct {
  40                 enum {CLUSTER_NONE, CLUSTER_READ, CLUSTER_WRITE} state;
  41                 struct list_head list;
  42                 void **buf;
  43         } cluster;
  44 #endif
  45 };
  46
  47 #define to_aobrq(rq) container_of((void *) rq, struct aob_rq_header, data)
  48
  49 int scm_blk_dev_setup(struct scm_blk_dev *, struct scm_device *);
  50 void scm_blk_dev_cleanup(struct scm_blk_dev *);
  51 void scm_blk_irq(struct scm_device *, void *, int);
  52
  53 void scm_request_finish(struct scm_request *);
  54 void scm_request_requeue(struct scm_request *);
  55
  56 int scm_drv_init(void);
  57 void scm_drv_cleanup(void);
  58
  59 #ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
  60 void __scm_free_rq_cluster(struct scm_request *);
  61 int __scm_alloc_rq_cluster(struct scm_request *);
  62 void scm_request_cluster_init(struct scm_request *);
  63 bool scm_reserve_cluster(struct scm_request *);
  64 void scm_release_cluster(struct scm_request *);
  65 void scm_blk_dev_cluster_setup(struct scm_blk_dev *);
  66 bool scm_need_cluster_request(struct scm_request *);
  67 void scm_initiate_cluster_request(struct scm_request *);
  68 void scm_cluster_request_irq(struct scm_request *);
  69 bool scm_test_cluster_request(struct scm_request *);
  70 bool scm_cluster_size_valid(void);
  71 #else /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */
  72 static inline void __scm_free_rq_cluster(struct scm_request *scmrq) {}
  73 static inline int __scm_alloc_rq_cluster(struct scm_request *scmrq)
  74 {
  75         return 0;
  76 }
  77 static inline void scm_request_cluster_init(struct scm_request *scmrq) {}
  78 static inline bool scm_reserve_cluster(struct scm_request *scmrq)
  79 {
  80         return true;
  81 }
  82 static inline void scm_release_cluster(struct scm_request *scmrq) {}
  83 static inline void scm_blk_dev_cluster_setup(struct scm_blk_dev *bdev) {}
  84 static inline bool scm_need_cluster_request(struct scm_request *scmrq)
  85 {
  86         return false;
  87 }
  88 static inline void scm_initiate_cluster_request(struct scm_request *scmrq) {}
  89 static inline void scm_cluster_request_irq(struct scm_request *scmrq) {}
  90 static inline bool scm_test_cluster_request(struct scm_request *scmrq)
  91 {
  92         return false;
  93 }
  94 static inline bool scm_cluster_size_valid(void)
  95 {
  96         return true;
  97 }
  98 #endif /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */
  99
 100 extern debug_info_t *scm_debug;
 101
 102 #define SCM_LOG(imp, txt) do {                                  \
 103                 debug_text_event(scm_debug, imp, txt);          \
 104         } while (0)
 105
 106 static inline void SCM_LOG_HEX(int level, void *data, int length)
 107 {
 108         if (level > scm_debug->level)
 109                 return;
 110         while (length > 0) {
 111                 debug_event(scm_debug, level, data, length);
 112                 length -= scm_debug->buf_size;
 113                 data += scm_debug->buf_size;
 114         }
 115 }
 116
 117 static inline void SCM_LOG_STATE(int level, struct scm_device *scmdev)
 118 {
 119         struct {
 120                 u64 address;
 121                 u8 oper_state;
 122                 u8 rank;
 123         } __packed data = {
 124                 .address = scmdev->address,
 125                 .oper_state = scmdev->attrs.oper_state,
 126                 .rank = scmdev->attrs.rank,
 127         };
 128
 129         SCM_LOG_HEX(level, &data, sizeof(data));
 130 }
 131
 132 #endif /* SCM_BLK_H */