| Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 1 | /* |
| 2 | * zfcp device driver |
| 3 | * |
| 4 | * Header file for zfcp qdio interface |
| 5 | * |
| 6 | * Copyright IBM Corporation 2010 |
| 7 | */ |
| 8 | |
| 9 | #ifndef ZFCP_QDIO_H |
| 10 | #define ZFCP_QDIO_H |
| 11 | |
| 12 | #include <asm/qdio.h> |
| 13 | |
| 14 | /** |
| 15 | * struct zfcp_qdio_queue - qdio queue buffer, zfcp index and free count |
| 16 | * @sbal: qdio buffers |
| 17 | * @first: index of next free buffer in queue |
| 18 | * @count: number of free buffers in queue |
| 19 | */ |
| 20 | struct zfcp_qdio_queue { |
| 21 | struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q]; |
| 22 | u8 first; |
| 23 | atomic_t count; |
| 24 | }; |
| 25 | |
| 26 | /** |
| 27 | * struct zfcp_qdio - basic qdio data structure |
| 28 | * @resp_q: response queue |
| 29 | * @req_q: request queue |
| 30 | * @stat_lock: lock to protect req_q_util and req_q_time |
| 31 | * @req_q_lock: lock to serialize access to request queue |
| 32 | * @req_q_time: time of last fill level change |
| 33 | * @req_q_util: used for accounting |
| 34 | * @req_q_full: queue full incidents |
| 35 | * @req_q_wq: used to wait for SBAL availability |
| 36 | * @adapter: adapter used in conjunction with this qdio structure |
| 37 | */ |
| 38 | struct zfcp_qdio { |
| 39 | struct zfcp_qdio_queue resp_q; |
| 40 | struct zfcp_qdio_queue req_q; |
| 41 | spinlock_t stat_lock; |
| 42 | spinlock_t req_q_lock; |
| 43 | unsigned long long req_q_time; |
| 44 | u64 req_q_util; |
| 45 | atomic_t req_q_full; |
| 46 | wait_queue_head_t req_q_wq; |
| 47 | struct zfcp_adapter *adapter; |
| 48 | }; |
| 49 | |
| 50 | /** |
| 51 | * struct zfcp_qdio_req - qdio queue related values for a request |
| 52 | * @sbal_number: number of free sbals |
| 53 | * @sbal_first: first sbal for this request |
| 54 | * @sbal_last: last sbal for this request |
| 55 | * @sbal_limit: last possible sbal for this request |
| 56 | * @sbale_curr: current sbale at creation of this request |
| 57 | * @sbal_response: sbal used in interrupt |
| 58 | * @qdio_outb_usage: usage of outbound queue |
| 59 | * @qdio_inb_usage: usage of inbound queue |
| 60 | */ |
| 61 | struct zfcp_qdio_req { |
| 62 | u8 sbal_number; |
| 63 | u8 sbal_first; |
| 64 | u8 sbal_last; |
| 65 | u8 sbal_limit; |
| 66 | u8 sbale_curr; |
| 67 | u8 sbal_response; |
| 68 | u16 qdio_outb_usage; |
| 69 | u16 qdio_inb_usage; |
| 70 | }; |
| 71 | |
| 72 | /** |
| 73 | * zfcp_qdio_sbale - return pointer to sbale in qdio queue |
| 74 | * @q: queue where to find sbal |
| 75 | * @sbal_idx: sbal index in queue |
| 76 | * @sbale_idx: sbale index in sbal |
| 77 | */ |
| 78 | static inline struct qdio_buffer_element * |
| 79 | zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx) |
| 80 | { |
| 81 | return &q->sbal[sbal_idx]->element[sbale_idx]; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request |
| 86 | * @qdio: pointer to struct zfcp_qdio |
| 87 | * @q_rec: pointer to struct zfcp_qdio_req |
| 88 | * Returns: pointer to qdio_buffer_element (sbale) structure |
| 89 | */ |
| 90 | static inline struct qdio_buffer_element * |
| 91 | zfcp_qdio_sbale_req(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
| 92 | { |
| 93 | return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, 0); |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * zfcp_qdio_sbale_curr - return current sbale on req_q for a request |
| 98 | * @qdio: pointer to struct zfcp_qdio |
| 99 | * @fsf_req: pointer to struct zfcp_fsf_req |
| 100 | * Returns: pointer to qdio_buffer_element (sbale) structure |
| 101 | */ |
| 102 | static inline struct qdio_buffer_element * |
| 103 | zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
| 104 | { |
| 105 | return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, |
| 106 | q_req->sbale_curr); |
| 107 | } |
| 108 | |
| 109 | #endif /* ZFCP_QDIO_H */ |