1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * zfcp device driver
4 *
5 * Setup and helper functions to access QDIO.
6 *
7 * Copyright IBM Corp. 2002, 2020
8 */
9
10 #define KMSG_COMPONENT "zfcp"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13 #include <linux/lockdep.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include "zfcp_ext.h"
17 #include "zfcp_qdio.h"
18
19 static bool enable_multibuffer = true;
20 module_param_named(datarouter, enable_multibuffer, bool, 0400);
21 MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)");
22
23 #define ZFCP_QDIO_REQUEST_RESCAN_MSECS (MSEC_PER_SEC * 10)
24 #define ZFCP_QDIO_REQUEST_SCAN_MSECS MSEC_PER_SEC
25
zfcp_qdio_handler_error(struct zfcp_qdio * qdio,char * dbftag,unsigned int qdio_err)26 static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *dbftag,
27 unsigned int qdio_err)
28 {
29 struct zfcp_adapter *adapter = qdio->adapter;
30
31 dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
32
33 if (qdio_err & QDIO_ERROR_SLSB_STATE) {
34 zfcp_qdio_siosl(adapter);
35 zfcp_erp_adapter_shutdown(adapter, 0, dbftag);
36 return;
37 }
38 zfcp_erp_adapter_reopen(adapter,
39 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
40 ZFCP_STATUS_COMMON_ERP_FAILED, dbftag);
41 }
42
zfcp_qdio_zero_sbals(struct qdio_buffer * sbal[],int first,int cnt)43 static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
44 {
45 int i, sbal_idx;
46
47 for (i = first; i < first + cnt; i++) {
48 sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
49 memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
50 }
51 }
52
53 /* this needs to be called prior to updating the queue fill level */
zfcp_qdio_account(struct zfcp_qdio * qdio)54 static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
55 {
56 unsigned long long now, span;
57 int used;
58
59 now = get_tod_clock_monotonic();
60 span = (now - qdio->req_q_time) >> 12;
61 used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
62 qdio->req_q_util += used * span;
63 qdio->req_q_time = now;
64 }
65
zfcp_qdio_int_req(struct ccw_device * cdev,unsigned int qdio_err,int queue_no,int idx,int count,unsigned long parm)66 static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
67 int queue_no, int idx, int count,
68 unsigned long parm)
69 {
70 struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
71
72 if (unlikely(qdio_err)) {
73 zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
74 return;
75 }
76 }
77
zfcp_qdio_request_tasklet(struct tasklet_struct * tasklet)78 static void zfcp_qdio_request_tasklet(struct tasklet_struct *tasklet)
79 {
80 struct zfcp_qdio *qdio = from_tasklet(qdio, tasklet, request_tasklet);
81 struct ccw_device *cdev = qdio->adapter->ccw_device;
82 unsigned int start, error;
83 int completed;
84
85 completed = qdio_inspect_queue(cdev, 0, false, &start, &error);
86 if (completed > 0) {
87 if (error) {
88 zfcp_qdio_handler_error(qdio, "qdreqt1", error);
89 } else {
90 /* cleanup all SBALs being program-owned now */
91 zfcp_qdio_zero_sbals(qdio->req_q, start, completed);
92
93 spin_lock_irq(&qdio->stat_lock);
94 zfcp_qdio_account(qdio);
95 spin_unlock_irq(&qdio->stat_lock);
96 atomic_add(completed, &qdio->req_q_free);
97 wake_up(&qdio->req_q_wq);
98 }
99 }
100
101 if (atomic_read(&qdio->req_q_free) < QDIO_MAX_BUFFERS_PER_Q)
102 timer_reduce(&qdio->request_timer,
103 jiffies + msecs_to_jiffies(ZFCP_QDIO_REQUEST_RESCAN_MSECS));
104 }
105
zfcp_qdio_request_timer(struct timer_list * timer)106 static void zfcp_qdio_request_timer(struct timer_list *timer)
107 {
108 struct zfcp_qdio *qdio = from_timer(qdio, timer, request_timer);
109
110 tasklet_schedule(&qdio->request_tasklet);
111 }
112
zfcp_qdio_int_resp(struct ccw_device * cdev,unsigned int qdio_err,int queue_no,int idx,int count,unsigned long parm)113 static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
114 int queue_no, int idx, int count,
115 unsigned long parm)
116 {
117 struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
118 struct zfcp_adapter *adapter = qdio->adapter;
119 int sbal_no, sbal_idx;
120
121 if (unlikely(qdio_err)) {
122 if (zfcp_adapter_multi_buffer_active(adapter)) {
123 void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
124 struct qdio_buffer_element *sbale;
125 u64 req_id;
126 u8 scount;
127
128 memset(pl, 0,
129 ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
130 sbale = qdio->res_q[idx]->element;
131 req_id = sbale->addr;
132 scount = min(sbale->scount + 1,
133 ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
134 /* incl. signaling SBAL */
135
136 for (sbal_no = 0; sbal_no < scount; sbal_no++) {
137 sbal_idx = (idx + sbal_no) %
138 QDIO_MAX_BUFFERS_PER_Q;
139 pl[sbal_no] = qdio->res_q[sbal_idx];
140 }
141 zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
142 }
143 zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
144 return;
145 }
146
147 /*
148 * go through all SBALs from input queue currently
149 * returned by QDIO layer
150 */
151 for (sbal_no = 0; sbal_no < count; sbal_no++) {
152 sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
153 /* go through all SBALEs of SBAL */
154 zfcp_fsf_reqid_check(qdio, sbal_idx);
155 }
156
157 /*
158 * put SBALs back to response queue
159 */
160 if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count, NULL))
161 zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
162 }
163
zfcp_qdio_irq_tasklet(struct tasklet_struct * tasklet)164 static void zfcp_qdio_irq_tasklet(struct tasklet_struct *tasklet)
165 {
166 struct zfcp_qdio *qdio = from_tasklet(qdio, tasklet, irq_tasklet);
167 struct ccw_device *cdev = qdio->adapter->ccw_device;
168 unsigned int start, error;
169 int completed;
170
171 if (atomic_read(&qdio->req_q_free) < QDIO_MAX_BUFFERS_PER_Q)
172 tasklet_schedule(&qdio->request_tasklet);
173
174 /* Check the Response Queue: */
175 completed = qdio_inspect_queue(cdev, 0, true, &start, &error);
176 if (completed < 0)
177 return;
178 if (completed > 0)
179 zfcp_qdio_int_resp(cdev, error, 0, start, completed,
180 (unsigned long) qdio);
181
182 if (qdio_start_irq(cdev))
183 /* More work pending: */
184 tasklet_schedule(&qdio->irq_tasklet);
185 }
186
zfcp_qdio_poll(struct ccw_device * cdev,unsigned long data)187 static void zfcp_qdio_poll(struct ccw_device *cdev, unsigned long data)
188 {
189 struct zfcp_qdio *qdio = (struct zfcp_qdio *) data;
190
191 tasklet_schedule(&qdio->irq_tasklet);
192 }
193
194 static struct qdio_buffer_element *
zfcp_qdio_sbal_chain(struct zfcp_qdio * qdio,struct zfcp_qdio_req * q_req)195 zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
196 {
197 struct qdio_buffer_element *sbale;
198
199 /* set last entry flag in current SBALE of current SBAL */
200 sbale = zfcp_qdio_sbale_curr(qdio, q_req);
201 sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY;
202
203 /* don't exceed last allowed SBAL */
204 if (q_req->sbal_last == q_req->sbal_limit)
205 return NULL;
206
207 /* set chaining flag in first SBALE of current SBAL */
208 sbale = zfcp_qdio_sbale_req(qdio, q_req);
209 sbale->sflags |= SBAL_SFLAGS0_MORE_SBALS;
210
211 /* calculate index of next SBAL */
212 q_req->sbal_last++;
213 q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
214
215 /* keep this requests number of SBALs up-to-date */
216 q_req->sbal_number++;
217 BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
218
219 /* start at first SBALE of new SBAL */
220 q_req->sbale_curr = 0;
221
222 /* set storage-block type for new SBAL */
223 sbale = zfcp_qdio_sbale_curr(qdio, q_req);
224 sbale->sflags |= q_req->sbtype;
225
226 return sbale;
227 }
228
229 static struct qdio_buffer_element *
zfcp_qdio_sbale_next(struct zfcp_qdio * qdio,struct zfcp_qdio_req * q_req)230 zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
231 {
232 if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
233 return zfcp_qdio_sbal_chain(qdio, q_req);
234 q_req->sbale_curr++;
235 return zfcp_qdio_sbale_curr(qdio, q_req);
236 }
237
238 /**
239 * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
240 * @qdio: pointer to struct zfcp_qdio
241 * @q_req: pointer to struct zfcp_qdio_req
242 * @sg: scatter-gather list
243 * Returns: zero or -EINVAL on error
244 */
zfcp_qdio_sbals_from_sg(struct zfcp_qdio * qdio,struct zfcp_qdio_req * q_req,struct scatterlist * sg)245 int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
246 struct scatterlist *sg)
247 {
248 struct qdio_buffer_element *sbale;
249
250 /* set storage-block type for this request */
251 sbale = zfcp_qdio_sbale_req(qdio, q_req);
252 sbale->sflags |= q_req->sbtype;
253
254 for (; sg; sg = sg_next(sg)) {
255 sbale = zfcp_qdio_sbale_next(qdio, q_req);
256 if (!sbale) {
257 atomic_inc(&qdio->req_q_full);
258 zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
259 q_req->sbal_number);
260 return -EINVAL;
261 }
262 sbale->addr = sg_phys(sg);
263 sbale->length = sg->length;
264 }
265 return 0;
266 }
267
zfcp_qdio_sbal_check(struct zfcp_qdio * qdio)268 static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
269 {
270 if (atomic_read(&qdio->req_q_free) ||
271 !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
272 return 1;
273 return 0;
274 }
275
276 /**
277 * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
278 * @qdio: pointer to struct zfcp_qdio
279 *
280 * The req_q_lock must be held by the caller of this function, and
281 * this function may only be called from process context; it will
282 * sleep when waiting for a free sbal.
283 *
284 * Returns: 0 on success, -EIO if there is no free sbal after waiting.
285 */
zfcp_qdio_sbal_get(struct zfcp_qdio * qdio)286 int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
287 {
288 long ret;
289
290 ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq,
291 zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ);
292
293 if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
294 return -EIO;
295
296 if (ret > 0)
297 return 0;
298
299 if (!ret) {
300 atomic_inc(&qdio->req_q_full);
301 /* assume hanging outbound queue, try queue recovery */
302 zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
303 }
304
305 return -EIO;
306 }
307
308 /**
309 * zfcp_qdio_send - send req to QDIO
310 * @qdio: pointer to struct zfcp_qdio
311 * @q_req: pointer to struct zfcp_qdio_req
312 * Returns: 0 on success, error otherwise
313 */
zfcp_qdio_send(struct zfcp_qdio * qdio,struct zfcp_qdio_req * q_req)314 int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
315 {
316 int retval;
317 u8 sbal_number = q_req->sbal_number;
318
319 /*
320 * This should actually be a spin_lock_bh(stat_lock), to protect against
321 * Request Queue completion processing in tasklet context.
322 * But we can't do so (and are safe), as we always get called with IRQs
323 * disabled by spin_lock_irq[save](req_q_lock).
324 */
325 lockdep_assert_irqs_disabled();
326 spin_lock(&qdio->stat_lock);
327 zfcp_qdio_account(qdio);
328 spin_unlock(&qdio->stat_lock);
329
330 atomic_sub(sbal_number, &qdio->req_q_free);
331
332 retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
333 q_req->sbal_first, sbal_number, NULL);
334
335 if (unlikely(retval)) {
336 /* Failed to submit the IO, roll back our modifications. */
337 atomic_add(sbal_number, &qdio->req_q_free);
338 zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
339 sbal_number);
340 return retval;
341 }
342
343 if (atomic_read(&qdio->req_q_free) <= 2 * ZFCP_QDIO_MAX_SBALS_PER_REQ)
344 tasklet_schedule(&qdio->request_tasklet);
345 else
346 timer_reduce(&qdio->request_timer,
347 jiffies + msecs_to_jiffies(ZFCP_QDIO_REQUEST_SCAN_MSECS));
348
349 /* account for transferred buffers */
350 qdio->req_q_idx += sbal_number;
351 qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
352
353 return 0;
354 }
355
356 /**
357 * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
358 * @qdio: pointer to struct zfcp_qdio
359 * Returns: -ENOMEM on memory allocation error or return value from
360 * qdio_allocate
361 */
zfcp_qdio_allocate(struct zfcp_qdio * qdio)362 static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
363 {
364 int ret;
365
366 ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
367 if (ret)
368 return -ENOMEM;
369
370 ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
371 if (ret)
372 goto free_req_q;
373
374 init_waitqueue_head(&qdio->req_q_wq);
375
376 ret = qdio_allocate(qdio->adapter->ccw_device, 1, 1);
377 if (ret)
378 goto free_res_q;
379
380 return 0;
381
382 free_res_q:
383 qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
384 free_req_q:
385 qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
386 return ret;
387 }
388
389 /**
390 * zfcp_close_qdio - close qdio queues for an adapter
391 * @qdio: pointer to structure zfcp_qdio
392 */
zfcp_qdio_close(struct zfcp_qdio * qdio)393 void zfcp_qdio_close(struct zfcp_qdio *qdio)
394 {
395 struct zfcp_adapter *adapter = qdio->adapter;
396 int idx, count;
397
398 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
399 return;
400
401 /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
402 spin_lock_irq(&qdio->req_q_lock);
403 atomic_andnot(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
404 spin_unlock_irq(&qdio->req_q_lock);
405
406 wake_up(&qdio->req_q_wq);
407
408 tasklet_disable(&qdio->irq_tasklet);
409 tasklet_disable(&qdio->request_tasklet);
410 del_timer_sync(&qdio->request_timer);
411 qdio_stop_irq(adapter->ccw_device);
412 qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
413
414 /* cleanup used outbound sbals */
415 count = atomic_read(&qdio->req_q_free);
416 if (count < QDIO_MAX_BUFFERS_PER_Q) {
417 idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
418 count = QDIO_MAX_BUFFERS_PER_Q - count;
419 zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
420 }
421 qdio->req_q_idx = 0;
422 atomic_set(&qdio->req_q_free, 0);
423 }
424
zfcp_qdio_shost_update(struct zfcp_adapter * const adapter,const struct zfcp_qdio * const qdio)425 void zfcp_qdio_shost_update(struct zfcp_adapter *const adapter,
426 const struct zfcp_qdio *const qdio)
427 {
428 struct Scsi_Host *const shost = adapter->scsi_host;
429
430 if (shost == NULL)
431 return;
432
433 shost->sg_tablesize = qdio->max_sbale_per_req;
434 shost->max_sectors = qdio->max_sbale_per_req * 8;
435 }
436
437 /**
438 * zfcp_qdio_open - prepare and initialize response queue
439 * @qdio: pointer to struct zfcp_qdio
440 * Returns: 0 on success, otherwise -EIO
441 */
zfcp_qdio_open(struct zfcp_qdio * qdio)442 int zfcp_qdio_open(struct zfcp_qdio *qdio)
443 {
444 struct qdio_buffer **input_sbals[1] = {qdio->res_q};
445 struct qdio_buffer **output_sbals[1] = {qdio->req_q};
446 struct qdio_buffer_element *sbale;
447 struct qdio_initialize init_data = {0};
448 struct zfcp_adapter *adapter = qdio->adapter;
449 struct ccw_device *cdev = adapter->ccw_device;
450 struct qdio_ssqd_desc ssqd;
451 int cc;
452
453 if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
454 return -EIO;
455
456 atomic_andnot(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
457 &qdio->adapter->status);
458
459 init_data.q_format = QDIO_ZFCP_QFMT;
460 init_data.qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
461 if (enable_multibuffer)
462 init_data.qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
463 init_data.no_input_qs = 1;
464 init_data.no_output_qs = 1;
465 init_data.input_handler = zfcp_qdio_int_resp;
466 init_data.output_handler = zfcp_qdio_int_req;
467 init_data.irq_poll = zfcp_qdio_poll;
468 init_data.int_parm = (unsigned long) qdio;
469 init_data.input_sbal_addr_array = input_sbals;
470 init_data.output_sbal_addr_array = output_sbals;
471
472 if (qdio_establish(cdev, &init_data))
473 goto failed_establish;
474
475 if (qdio_get_ssqd_desc(cdev, &ssqd))
476 goto failed_qdio;
477
478 if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
479 atomic_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
480 &qdio->adapter->status);
481
482 if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
483 atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
484 qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
485 } else {
486 atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
487 qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
488 }
489
490 qdio->max_sbale_per_req =
491 ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
492 - 2;
493 if (qdio_activate(cdev))
494 goto failed_qdio;
495
496 for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
497 sbale = &(qdio->res_q[cc]->element[0]);
498 sbale->length = 0;
499 sbale->eflags = SBAL_EFLAGS_LAST_ENTRY;
500 sbale->sflags = 0;
501 sbale->addr = 0;
502 }
503
504 if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q,
505 NULL))
506 goto failed_qdio;
507
508 /* set index of first available SBALS / number of available SBALS */
509 qdio->req_q_idx = 0;
510 atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
511 atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
512
513 /* Enable processing for Request Queue completions: */
514 tasklet_enable(&qdio->request_tasklet);
515 /* Enable processing for QDIO interrupts: */
516 tasklet_enable(&qdio->irq_tasklet);
517 /* This results in a qdio_start_irq(): */
518 tasklet_schedule(&qdio->irq_tasklet);
519
520 zfcp_qdio_shost_update(adapter, qdio);
521
522 return 0;
523
524 failed_qdio:
525 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
526 failed_establish:
527 dev_err(&cdev->dev,
528 "Setting up the QDIO connection to the FCP adapter failed\n");
529 return -EIO;
530 }
531
zfcp_qdio_destroy(struct zfcp_qdio * qdio)532 void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
533 {
534 if (!qdio)
535 return;
536
537 tasklet_kill(&qdio->irq_tasklet);
538 tasklet_kill(&qdio->request_tasklet);
539
540 if (qdio->adapter->ccw_device)
541 qdio_free(qdio->adapter->ccw_device);
542
543 qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
544 qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
545 kfree(qdio);
546 }
547
zfcp_qdio_setup(struct zfcp_adapter * adapter)548 int zfcp_qdio_setup(struct zfcp_adapter *adapter)
549 {
550 struct zfcp_qdio *qdio;
551
552 qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
553 if (!qdio)
554 return -ENOMEM;
555
556 qdio->adapter = adapter;
557
558 if (zfcp_qdio_allocate(qdio)) {
559 kfree(qdio);
560 return -ENOMEM;
561 }
562
563 spin_lock_init(&qdio->req_q_lock);
564 spin_lock_init(&qdio->stat_lock);
565 timer_setup(&qdio->request_timer, zfcp_qdio_request_timer, 0);
566 tasklet_setup(&qdio->irq_tasklet, zfcp_qdio_irq_tasklet);
567 tasklet_setup(&qdio->request_tasklet, zfcp_qdio_request_tasklet);
568 tasklet_disable(&qdio->irq_tasklet);
569 tasklet_disable(&qdio->request_tasklet);
570
571 adapter->qdio = qdio;
572 return 0;
573 }
574
575 /**
576 * zfcp_qdio_siosl - Trigger logging in FCP channel
577 * @adapter: The zfcp_adapter where to trigger logging
578 *
579 * Call the cio siosl function to trigger hardware logging. This
580 * wrapper function sets a flag to ensure hardware logging is only
581 * triggered once before going through qdio shutdown.
582 *
583 * The triggers are always run from qdio tasklet context, so no
584 * additional synchronization is necessary.
585 */
zfcp_qdio_siosl(struct zfcp_adapter * adapter)586 void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
587 {
588 int rc;
589
590 if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
591 return;
592
593 rc = ccw_device_siosl(adapter->ccw_device);
594 if (!rc)
595 atomic_or(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
596 &adapter->status);
597 }
598