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267 lines
7.3 KiB
267 lines
7.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* zfcp device driver |
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* |
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* Header file for zfcp qdio interface |
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* |
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* Copyright IBM Corp. 2010 |
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*/ |
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#ifndef ZFCP_QDIO_H |
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#define ZFCP_QDIO_H |
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#include <linux/interrupt.h> |
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#include <asm/qdio.h> |
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#define ZFCP_QDIO_SBALE_LEN PAGE_SIZE |
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/* Max SBALS for chaining */ |
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#define ZFCP_QDIO_MAX_SBALS_PER_REQ 36 |
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/** |
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* struct zfcp_qdio - basic qdio data structure |
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* @res_q: response queue |
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* @req_q: request queue |
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* @req_q_idx: index of next free buffer |
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* @req_q_free: number of free buffers in queue |
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* @stat_lock: lock to protect req_q_util and req_q_time |
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* @req_q_lock: lock to serialize access to request queue |
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* @req_q_time: time of last fill level change |
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* @req_q_util: used for accounting |
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* @req_q_full: queue full incidents |
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* @req_q_wq: used to wait for SBAL availability |
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* @irq_tasklet: used for QDIO interrupt processing |
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* @request_tasklet: used for Request Queue completion processing |
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* @request_timer: used to trigger the Request Queue completion processing |
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* @adapter: adapter used in conjunction with this qdio structure |
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* @max_sbale_per_sbal: qdio limit per sbal |
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* @max_sbale_per_req: qdio limit per request |
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*/ |
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struct zfcp_qdio { |
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struct qdio_buffer *res_q[QDIO_MAX_BUFFERS_PER_Q]; |
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struct qdio_buffer *req_q[QDIO_MAX_BUFFERS_PER_Q]; |
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u8 req_q_idx; |
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atomic_t req_q_free; |
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spinlock_t stat_lock; |
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spinlock_t req_q_lock; |
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unsigned long long req_q_time; |
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u64 req_q_util; |
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atomic_t req_q_full; |
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wait_queue_head_t req_q_wq; |
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struct tasklet_struct irq_tasklet; |
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struct tasklet_struct request_tasklet; |
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struct timer_list request_timer; |
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struct zfcp_adapter *adapter; |
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u16 max_sbale_per_sbal; |
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u16 max_sbale_per_req; |
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}; |
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/** |
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* struct zfcp_qdio_req - qdio queue related values for a request |
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* @sbtype: sbal type flags for sbale 0 |
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* @sbal_number: number of free sbals |
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* @sbal_first: first sbal for this request |
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* @sbal_last: last sbal for this request |
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* @sbal_limit: last possible sbal for this request |
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* @sbale_curr: current sbale at creation of this request |
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* @qdio_outb_usage: usage of outbound queue |
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*/ |
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struct zfcp_qdio_req { |
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u8 sbtype; |
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u8 sbal_number; |
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u8 sbal_first; |
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u8 sbal_last; |
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u8 sbal_limit; |
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u8 sbale_curr; |
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u16 qdio_outb_usage; |
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}; |
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/** |
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* zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request |
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* @qdio: pointer to struct zfcp_qdio |
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* @q_req: pointer to struct zfcp_qdio_req |
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* Returns: pointer to qdio_buffer_element (sbale) structure |
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*/ |
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static inline struct qdio_buffer_element * |
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zfcp_qdio_sbale_req(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
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{ |
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return &qdio->req_q[q_req->sbal_last]->element[0]; |
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} |
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/** |
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* zfcp_qdio_sbale_curr - return current sbale on req_q for a request |
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* @qdio: pointer to struct zfcp_qdio |
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* @q_req: pointer to struct zfcp_qdio_req |
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* Returns: pointer to qdio_buffer_element (sbale) structure |
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*/ |
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static inline struct qdio_buffer_element * |
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zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
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{ |
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return &qdio->req_q[q_req->sbal_last]->element[q_req->sbale_curr]; |
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} |
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/** |
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* zfcp_qdio_req_init - initialize qdio request |
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* @qdio: request queue where to start putting the request |
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* @q_req: the qdio request to start |
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* @req_id: The request id |
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* @sbtype: type flags to set for all sbals |
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* @data: First data block |
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* @len: Length of first data block |
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* |
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* This is the start of putting the request into the queue, the last |
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* step is passing the request to zfcp_qdio_send. The request queue |
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* lock must be held during the whole process from init to send. |
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*/ |
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static inline |
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void zfcp_qdio_req_init(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, |
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unsigned long req_id, u8 sbtype, void *data, u32 len) |
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{ |
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struct qdio_buffer_element *sbale; |
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int count = min(atomic_read(&qdio->req_q_free), |
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ZFCP_QDIO_MAX_SBALS_PER_REQ); |
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q_req->sbal_first = q_req->sbal_last = qdio->req_q_idx; |
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q_req->sbal_number = 1; |
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q_req->sbtype = sbtype; |
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q_req->sbale_curr = 1; |
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q_req->sbal_limit = (q_req->sbal_first + count - 1) |
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% QDIO_MAX_BUFFERS_PER_Q; |
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sbale = zfcp_qdio_sbale_req(qdio, q_req); |
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sbale->addr = req_id; |
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sbale->eflags = 0; |
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sbale->sflags = SBAL_SFLAGS0_COMMAND | sbtype; |
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if (unlikely(!data)) |
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return; |
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sbale++; |
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sbale->addr = virt_to_phys(data); |
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sbale->length = len; |
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} |
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/** |
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* zfcp_qdio_fill_next - Fill next sbale, only for single sbal requests |
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* @qdio: pointer to struct zfcp_qdio |
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* @q_req: pointer to struct zfcp_queue_req |
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* @data: pointer to data |
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* @len: length of data |
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* |
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* This is only required for single sbal requests, calling it when |
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* wrapping around to the next sbal is a bug. |
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*/ |
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static inline |
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void zfcp_qdio_fill_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, |
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void *data, u32 len) |
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{ |
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struct qdio_buffer_element *sbale; |
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BUG_ON(q_req->sbale_curr == qdio->max_sbale_per_sbal - 1); |
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q_req->sbale_curr++; |
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sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
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sbale->addr = virt_to_phys(data); |
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sbale->length = len; |
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} |
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/** |
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* zfcp_qdio_set_sbale_last - set last entry flag in current sbale |
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* @qdio: pointer to struct zfcp_qdio |
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* @q_req: pointer to struct zfcp_queue_req |
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*/ |
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static inline |
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void zfcp_qdio_set_sbale_last(struct zfcp_qdio *qdio, |
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struct zfcp_qdio_req *q_req) |
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{ |
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struct qdio_buffer_element *sbale; |
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sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
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sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY; |
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} |
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/** |
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* zfcp_qdio_sg_one_sbal - check if one sbale is enough for sg data |
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* @sg: The scatterlist where to check the data size |
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* |
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* Returns: 1 when one sbale is enough for the data in the scatterlist, |
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* 0 if not. |
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*/ |
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static inline |
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int zfcp_qdio_sg_one_sbale(struct scatterlist *sg) |
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{ |
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return sg_is_last(sg) && sg->length <= ZFCP_QDIO_SBALE_LEN; |
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} |
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/** |
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* zfcp_qdio_skip_to_last_sbale - skip to last sbale in sbal |
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* @qdio: pointer to struct zfcp_qdio |
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* @q_req: The current zfcp_qdio_req |
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*/ |
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static inline |
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void zfcp_qdio_skip_to_last_sbale(struct zfcp_qdio *qdio, |
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struct zfcp_qdio_req *q_req) |
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{ |
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q_req->sbale_curr = qdio->max_sbale_per_sbal - 1; |
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} |
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/** |
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* zfcp_qdio_sbal_limit - set the sbal limit for a request in q_req |
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* @qdio: pointer to struct zfcp_qdio |
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* @q_req: The current zfcp_qdio_req |
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* @max_sbals: maximum number of SBALs allowed |
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*/ |
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static inline |
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void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio, |
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struct zfcp_qdio_req *q_req, int max_sbals) |
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{ |
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int count = min(atomic_read(&qdio->req_q_free), max_sbals); |
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q_req->sbal_limit = (q_req->sbal_first + count - 1) % |
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QDIO_MAX_BUFFERS_PER_Q; |
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} |
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/** |
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* zfcp_qdio_set_data_div - set data division count |
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* @qdio: pointer to struct zfcp_qdio |
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* @q_req: The current zfcp_qdio_req |
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* @count: The data division count |
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*/ |
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static inline |
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void zfcp_qdio_set_data_div(struct zfcp_qdio *qdio, |
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struct zfcp_qdio_req *q_req, u32 count) |
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{ |
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struct qdio_buffer_element *sbale; |
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sbale = qdio->req_q[q_req->sbal_first]->element; |
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sbale->length = count; |
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} |
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/** |
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* zfcp_qdio_real_bytes - count bytes used |
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* @sg: pointer to struct scatterlist |
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*/ |
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static inline |
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unsigned int zfcp_qdio_real_bytes(struct scatterlist *sg) |
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{ |
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unsigned int real_bytes = 0; |
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for (; sg; sg = sg_next(sg)) |
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real_bytes += sg->length; |
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return real_bytes; |
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} |
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/** |
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* zfcp_qdio_set_scount - set SBAL count value |
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* @qdio: pointer to struct zfcp_qdio |
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* @q_req: The current zfcp_qdio_req |
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*/ |
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static inline |
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void zfcp_qdio_set_scount(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
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{ |
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struct qdio_buffer_element *sbale; |
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sbale = qdio->req_q[q_req->sbal_first]->element; |
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sbale->scount = q_req->sbal_number - 1; |
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} |
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#endif /* ZFCP_QDIO_H */
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