1 /* SPDX-License-Identifier: GPL-2.0 */
22  * struct zfcp_qdio - basic qdio data structure
29  * @req_q_time: time of last fill level change
30  * @req_q_util: used for accounting
32  * @req_q_wq: used to wait for SBAL availability
33  * @irq_tasklet: used for QDIO interrupt processing
34  * @request_tasklet: used for Request Queue completion processing
35  * @request_timer: used to trigger the Request Queue completion processing
36  * @adapter: adapter used in conjunction with this qdio structure
60  * struct zfcp_qdio_req - qdio queue related values for a request
64  * @sbal_last: last sbal for this request
65  * @sbal_limit: last possible sbal for this request
80  * zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request
88 	return &qdio->req_q[q_req->sbal_last]->element[0];  in zfcp_qdio_sbale_req()
92  * zfcp_qdio_sbale_curr - return current sbale on req_q for a request
100 	return &qdio->req_q[q_req->sbal_last]->element[q_req->sbale_curr];  in zfcp_qdio_sbale_curr()
104  * zfcp_qdio_req_init - initialize qdio request
112  * This is the start of putting the request into the queue, the last
121 	int count = min(atomic_read(&qdio->req_q_free),  in zfcp_qdio_req_init()
124 	q_req->sbal_first = q_req->sbal_last = qdio->req_q_idx;  in zfcp_qdio_req_init()
125 	q_req->sbal_number = 1;  in zfcp_qdio_req_init()
126 	q_req->sbtype = sbtype;  in zfcp_qdio_req_init()
127 	q_req->sbale_curr = 1;  in zfcp_qdio_req_init()
128 	q_req->sbal_limit = (q_req->sbal_first + count - 1)  in zfcp_qdio_req_init()
132 	sbale->addr = u64_to_dma64(req_id);  in zfcp_qdio_req_init()
133 	sbale->eflags = 0;  in zfcp_qdio_req_init()
134 	sbale->sflags = SBAL_SFLAGS0_COMMAND | sbtype;  in zfcp_qdio_req_init()
139 	sbale->addr = virt_to_dma64(data);  in zfcp_qdio_req_init()
140 	sbale->length = len;  in zfcp_qdio_req_init()
144  * zfcp_qdio_fill_next - Fill next sbale, only for single sbal requests
159 	BUG_ON(q_req->sbale_curr == qdio->max_sbale_per_sbal - 1);  in zfcp_qdio_fill_next()
160 	q_req->sbale_curr++;  in zfcp_qdio_fill_next()
162 	sbale->addr = virt_to_dma64(data);  in zfcp_qdio_fill_next()
163 	sbale->length = len;  in zfcp_qdio_fill_next()
167  * zfcp_qdio_set_sbale_last - set last entry flag in current sbale
178 	sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY;  in zfcp_qdio_set_sbale_last()
182  * zfcp_qdio_sg_one_sbal - check if one sbale is enough for sg data
191 	return sg_is_last(sg) && sg->length <= ZFCP_QDIO_SBALE_LEN;  in zfcp_qdio_sg_one_sbale()
195  * zfcp_qdio_skip_to_last_sbale - skip to last sbale in sbal
203 	q_req->sbale_curr = qdio->max_sbale_per_sbal - 1;  in zfcp_qdio_skip_to_last_sbale()
207  * zfcp_qdio_sbal_limit - set the sbal limit for a request in q_req
216 	int count = min(atomic_read(&qdio->req_q_free), max_sbals);  in zfcp_qdio_sbal_limit()
218 	q_req->sbal_limit = (q_req->sbal_first + count - 1) %  in zfcp_qdio_sbal_limit()
223  * zfcp_qdio_set_data_div - set data division count
234 	sbale = qdio->req_q[q_req->sbal_first]->element;  in zfcp_qdio_set_data_div()
235 	sbale->length = count;  in zfcp_qdio_set_data_div()
239  * zfcp_qdio_real_bytes - count bytes used
248 		real_bytes += sg->length;  in zfcp_qdio_real_bytes()
254  * zfcp_qdio_set_scount - set SBAL count value
263 	sbale = qdio->req_q[q_req->sbal_first]->element;  in zfcp_qdio_set_scount()
264 	sbale->scount = q_req->sbal_number - 1;  in zfcp_qdio_set_scount()