| /* |
| * zfcp device driver |
| * |
| * Header file for zfcp qdio interface |
| * |
| * Copyright IBM Corporation 2010 |
| */ |
| |
| #ifndef ZFCP_QDIO_H |
| #define ZFCP_QDIO_H |
| |
| #include <asm/qdio.h> |
| |
| /** |
| * struct zfcp_qdio_queue - qdio queue buffer, zfcp index and free count |
| * @sbal: qdio buffers |
| * @first: index of next free buffer in queue |
| * @count: number of free buffers in queue |
| */ |
| struct zfcp_qdio_queue { |
| struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q]; |
| u8 first; |
| atomic_t count; |
| }; |
| |
| /** |
| * struct zfcp_qdio - basic qdio data structure |
| * @resp_q: response queue |
| * @req_q: request queue |
| * @stat_lock: lock to protect req_q_util and req_q_time |
| * @req_q_lock: lock to serialize access to request queue |
| * @req_q_time: time of last fill level change |
| * @req_q_util: used for accounting |
| * @req_q_full: queue full incidents |
| * @req_q_wq: used to wait for SBAL availability |
| * @adapter: adapter used in conjunction with this qdio structure |
| */ |
| struct zfcp_qdio { |
| struct zfcp_qdio_queue resp_q; |
| struct zfcp_qdio_queue req_q; |
| spinlock_t stat_lock; |
| spinlock_t req_q_lock; |
| unsigned long long req_q_time; |
| u64 req_q_util; |
| atomic_t req_q_full; |
| wait_queue_head_t req_q_wq; |
| struct zfcp_adapter *adapter; |
| }; |
| |
| /** |
| * struct zfcp_qdio_req - qdio queue related values for a request |
| * @sbal_number: number of free sbals |
| * @sbal_first: first sbal for this request |
| * @sbal_last: last sbal for this request |
| * @sbal_limit: last possible sbal for this request |
| * @sbale_curr: current sbale at creation of this request |
| * @sbal_response: sbal used in interrupt |
| * @qdio_outb_usage: usage of outbound queue |
| * @qdio_inb_usage: usage of inbound queue |
| */ |
| struct zfcp_qdio_req { |
| u8 sbal_number; |
| u8 sbal_first; |
| u8 sbal_last; |
| u8 sbal_limit; |
| u8 sbale_curr; |
| u8 sbal_response; |
| u16 qdio_outb_usage; |
| u16 qdio_inb_usage; |
| }; |
| |
| /** |
| * zfcp_qdio_sbale - return pointer to sbale in qdio queue |
| * @q: queue where to find sbal |
| * @sbal_idx: sbal index in queue |
| * @sbale_idx: sbale index in sbal |
| */ |
| static inline struct qdio_buffer_element * |
| zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx) |
| { |
| return &q->sbal[sbal_idx]->element[sbale_idx]; |
| } |
| |
| /** |
| * zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request |
| * @qdio: pointer to struct zfcp_qdio |
| * @q_rec: pointer to struct zfcp_qdio_req |
| * Returns: pointer to qdio_buffer_element (sbale) structure |
| */ |
| static inline struct qdio_buffer_element * |
| zfcp_qdio_sbale_req(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
| { |
| return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, 0); |
| } |
| |
| /** |
| * zfcp_qdio_sbale_curr - return current sbale on req_q for a request |
| * @qdio: pointer to struct zfcp_qdio |
| * @fsf_req: pointer to struct zfcp_fsf_req |
| * Returns: pointer to qdio_buffer_element (sbale) structure |
| */ |
| static inline struct qdio_buffer_element * |
| zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
| { |
| return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, |
| q_req->sbale_curr); |
| } |
| |
| #endif /* ZFCP_QDIO_H */ |
