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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/slab.h>
14#include <linux/module.h>
15#include "zfcp_ext.h"
16#include "zfcp_qdio.h"
17
18static bool enable_multibuffer = true;
19module_param_named(datarouter, enable_multibuffer, bool, 0400);
20MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)");
21
22static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *dbftag,
23 unsigned int qdio_err)
24{
25 struct zfcp_adapter *adapter = qdio->adapter;
26
27 dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
28
29 if (qdio_err & QDIO_ERROR_SLSB_STATE) {
30 zfcp_qdio_siosl(adapter);
31 zfcp_erp_adapter_shutdown(adapter, 0, dbftag);
32 return;
33 }
34 zfcp_erp_adapter_reopen(adapter,
35 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
36 ZFCP_STATUS_COMMON_ERP_FAILED, dbftag);
37}
38
39static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
40{
41 int i, sbal_idx;
42
43 for (i = first; i < first + cnt; i++) {
44 sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
45 memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
46 }
47}
48
49/* this needs to be called prior to updating the queue fill level */
50static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
51{
52 unsigned long long now, span;
53 int used;
54
55 now = get_tod_clock_monotonic();
56 span = (now - qdio->req_q_time) >> 12;
57 used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
58 qdio->req_q_util += used * span;
59 qdio->req_q_time = now;
60}
61
62static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
63 int queue_no, int idx, int count,
64 unsigned long parm)
65{
66 struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
67
68 if (unlikely(qdio_err)) {
69 zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
70 return;
71 }
72
73 /* cleanup all SBALs being program-owned now */
74 zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
75
76 spin_lock_irq(&qdio->stat_lock);
77 zfcp_qdio_account(qdio);
78 spin_unlock_irq(&qdio->stat_lock);
79 atomic_add(count, &qdio->req_q_free);
80 wake_up(&qdio->req_q_wq);
81}
82
83static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
84 int queue_no, int idx, int count,
85 unsigned long parm)
86{
87 struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
88 struct zfcp_adapter *adapter = qdio->adapter;
89 int sbal_no, sbal_idx;
90
91 if (unlikely(qdio_err)) {
92 if (zfcp_adapter_multi_buffer_active(adapter)) {
93 void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
94 struct qdio_buffer_element *sbale;
95 u64 req_id;
96 u8 scount;
97
98 memset(pl, 0,
99 ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
100 sbale = qdio->res_q[idx]->element;
101 req_id = sbale->addr;
102 scount = min(sbale->scount + 1,
103 ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
104 /* incl. signaling SBAL */
105
106 for (sbal_no = 0; sbal_no < scount; sbal_no++) {
107 sbal_idx = (idx + sbal_no) %
108 QDIO_MAX_BUFFERS_PER_Q;
109 pl[sbal_no] = qdio->res_q[sbal_idx];
110 }
111 zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
112 }
113 zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
114 return;
115 }
116
117 /*
118 * go through all SBALs from input queue currently
119 * returned by QDIO layer
120 */
121 for (sbal_no = 0; sbal_no < count; sbal_no++) {
122 sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
123 /* go through all SBALEs of SBAL */
124 zfcp_fsf_reqid_check(qdio, sbal_idx);
125 }
126
127 /*
128 * put SBALs back to response queue
129 */
130 if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
131 zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
132}
133
134static struct qdio_buffer_element *
135zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
136{
137 struct qdio_buffer_element *sbale;
138
139 /* set last entry flag in current SBALE of current SBAL */
140 sbale = zfcp_qdio_sbale_curr(qdio, q_req);
141 sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY;
142
143 /* don't exceed last allowed SBAL */
144 if (q_req->sbal_last == q_req->sbal_limit)
145 return NULL;
146
147 /* set chaining flag in first SBALE of current SBAL */
148 sbale = zfcp_qdio_sbale_req(qdio, q_req);
149 sbale->sflags |= SBAL_SFLAGS0_MORE_SBALS;
150
151 /* calculate index of next SBAL */
152 q_req->sbal_last++;
153 q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
154
155 /* keep this requests number of SBALs up-to-date */
156 q_req->sbal_number++;
157 BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
158
159 /* start at first SBALE of new SBAL */
160 q_req->sbale_curr = 0;
161
162 /* set storage-block type for new SBAL */
163 sbale = zfcp_qdio_sbale_curr(qdio, q_req);
164 sbale->sflags |= q_req->sbtype;
165
166 return sbale;
167}
168
169static struct qdio_buffer_element *
170zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
171{
172 if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
173 return zfcp_qdio_sbal_chain(qdio, q_req);
174 q_req->sbale_curr++;
175 return zfcp_qdio_sbale_curr(qdio, q_req);
176}
177
178/**
179 * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
180 * @qdio: pointer to struct zfcp_qdio
181 * @q_req: pointer to struct zfcp_qdio_req
182 * @sg: scatter-gather list
183 * Returns: zero or -EINVAL on error
184 */
185int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
186 struct scatterlist *sg)
187{
188 struct qdio_buffer_element *sbale;
189
190 /* set storage-block type for this request */
191 sbale = zfcp_qdio_sbale_req(qdio, q_req);
192 sbale->sflags |= q_req->sbtype;
193
194 for (; sg; sg = sg_next(sg)) {
195 sbale = zfcp_qdio_sbale_next(qdio, q_req);
196 if (!sbale) {
197 atomic_inc(&qdio->req_q_full);
198 zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
199 q_req->sbal_number);
200 return -EINVAL;
201 }
202 sbale->addr = sg_phys(sg);
203 sbale->length = sg->length;
204 }
205 return 0;
206}
207
208static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
209{
210 if (atomic_read(&qdio->req_q_free) ||
211 !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
212 return 1;
213 return 0;
214}
215
216/**
217 * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
218 * @qdio: pointer to struct zfcp_qdio
219 *
220 * The req_q_lock must be held by the caller of this function, and
221 * this function may only be called from process context; it will
222 * sleep when waiting for a free sbal.
223 *
224 * Returns: 0 on success, -EIO if there is no free sbal after waiting.
225 */
226int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
227{
228 long ret;
229
230 ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq,
231 zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ);
232
233 if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
234 return -EIO;
235
236 if (ret > 0)
237 return 0;
238
239 if (!ret) {
240 atomic_inc(&qdio->req_q_full);
241 /* assume hanging outbound queue, try queue recovery */
242 zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
243 }
244
245 return -EIO;
246}
247
248/**
249 * zfcp_qdio_send - send req to QDIO
250 * @qdio: pointer to struct zfcp_qdio
251 * @q_req: pointer to struct zfcp_qdio_req
252 * Returns: 0 on success, error otherwise
253 */
254int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
255{
256 int retval;
257 u8 sbal_number = q_req->sbal_number;
258
259 spin_lock(&qdio->stat_lock);
260 zfcp_qdio_account(qdio);
261 spin_unlock(&qdio->stat_lock);
262
263 atomic_sub(sbal_number, &qdio->req_q_free);
264
265 retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
266 q_req->sbal_first, sbal_number);
267
268 if (unlikely(retval)) {
269 /* Failed to submit the IO, roll back our modifications. */
270 atomic_add(sbal_number, &qdio->req_q_free);
271 zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
272 sbal_number);
273 return retval;
274 }
275
276 /* account for transferred buffers */
277 qdio->req_q_idx += sbal_number;
278 qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
279
280 return 0;
281}
282
283/**
284 * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
285 * @qdio: pointer to struct zfcp_qdio
286 * Returns: -ENOMEM on memory allocation error or return value from
287 * qdio_allocate
288 */
289static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
290{
291 int ret;
292
293 ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
294 if (ret)
295 return -ENOMEM;
296
297 ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
298 if (ret)
299 goto free_req_q;
300
301 init_waitqueue_head(&qdio->req_q_wq);
302
303 ret = qdio_allocate(qdio->adapter->ccw_device, 1, 1);
304 if (ret)
305 goto free_res_q;
306
307 return 0;
308
309free_res_q:
310 qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
311free_req_q:
312 qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
313 return ret;
314}
315
316/**
317 * zfcp_close_qdio - close qdio queues for an adapter
318 * @qdio: pointer to structure zfcp_qdio
319 */
320void zfcp_qdio_close(struct zfcp_qdio *qdio)
321{
322 struct zfcp_adapter *adapter = qdio->adapter;
323 int idx, count;
324
325 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
326 return;
327
328 /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
329 spin_lock_irq(&qdio->req_q_lock);
330 atomic_andnot(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
331 spin_unlock_irq(&qdio->req_q_lock);
332
333 wake_up(&qdio->req_q_wq);
334
335 qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
336
337 /* cleanup used outbound sbals */
338 count = atomic_read(&qdio->req_q_free);
339 if (count < QDIO_MAX_BUFFERS_PER_Q) {
340 idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
341 count = QDIO_MAX_BUFFERS_PER_Q - count;
342 zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
343 }
344 qdio->req_q_idx = 0;
345 atomic_set(&qdio->req_q_free, 0);
346}
347
348void zfcp_qdio_shost_update(struct zfcp_adapter *const adapter,
349 const struct zfcp_qdio *const qdio)
350{
351 struct Scsi_Host *const shost = adapter->scsi_host;
352
353 if (shost == NULL)
354 return;
355
356 shost->sg_tablesize = qdio->max_sbale_per_req;
357 shost->max_sectors = qdio->max_sbale_per_req * 8;
358}
359
360/**
361 * zfcp_qdio_open - prepare and initialize response queue
362 * @qdio: pointer to struct zfcp_qdio
363 * Returns: 0 on success, otherwise -EIO
364 */
365int zfcp_qdio_open(struct zfcp_qdio *qdio)
366{
367 struct qdio_buffer **input_sbals[1] = {qdio->res_q};
368 struct qdio_buffer **output_sbals[1] = {qdio->req_q};
369 struct qdio_buffer_element *sbale;
370 struct qdio_initialize init_data = {0};
371 struct zfcp_adapter *adapter = qdio->adapter;
372 struct ccw_device *cdev = adapter->ccw_device;
373 struct qdio_ssqd_desc ssqd;
374 int cc;
375
376 if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
377 return -EIO;
378
379 atomic_andnot(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
380 &qdio->adapter->status);
381
382 init_data.q_format = QDIO_ZFCP_QFMT;
383 memcpy(init_data.adapter_name, dev_name(&cdev->dev), 8);
384 ASCEBC(init_data.adapter_name, 8);
385 init_data.qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
386 if (enable_multibuffer)
387 init_data.qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
388 init_data.no_input_qs = 1;
389 init_data.no_output_qs = 1;
390 init_data.input_handler = zfcp_qdio_int_resp;
391 init_data.output_handler = zfcp_qdio_int_req;
392 init_data.int_parm = (unsigned long) qdio;
393 init_data.input_sbal_addr_array = input_sbals;
394 init_data.output_sbal_addr_array = output_sbals;
395 init_data.scan_threshold =
396 QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
397
398 if (qdio_establish(cdev, &init_data))
399 goto failed_establish;
400
401 if (qdio_get_ssqd_desc(cdev, &ssqd))
402 goto failed_qdio;
403
404 if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
405 atomic_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
406 &qdio->adapter->status);
407
408 if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
409 atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
410 qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
411 } else {
412 atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
413 qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
414 }
415
416 qdio->max_sbale_per_req =
417 ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
418 - 2;
419 if (qdio_activate(cdev))
420 goto failed_qdio;
421
422 for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
423 sbale = &(qdio->res_q[cc]->element[0]);
424 sbale->length = 0;
425 sbale->eflags = SBAL_EFLAGS_LAST_ENTRY;
426 sbale->sflags = 0;
427 sbale->addr = 0;
428 }
429
430 if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
431 goto failed_qdio;
432
433 /* set index of first available SBALS / number of available SBALS */
434 qdio->req_q_idx = 0;
435 atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
436 atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
437
438 zfcp_qdio_shost_update(adapter, qdio);
439
440 return 0;
441
442failed_qdio:
443 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
444failed_establish:
445 dev_err(&cdev->dev,
446 "Setting up the QDIO connection to the FCP adapter failed\n");
447 return -EIO;
448}
449
450void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
451{
452 if (!qdio)
453 return;
454
455 if (qdio->adapter->ccw_device)
456 qdio_free(qdio->adapter->ccw_device);
457
458 qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
459 qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
460 kfree(qdio);
461}
462
463int zfcp_qdio_setup(struct zfcp_adapter *adapter)
464{
465 struct zfcp_qdio *qdio;
466
467 qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
468 if (!qdio)
469 return -ENOMEM;
470
471 qdio->adapter = adapter;
472
473 if (zfcp_qdio_allocate(qdio)) {
474 kfree(qdio);
475 return -ENOMEM;
476 }
477
478 spin_lock_init(&qdio->req_q_lock);
479 spin_lock_init(&qdio->stat_lock);
480
481 adapter->qdio = qdio;
482 return 0;
483}
484
485/**
486 * zfcp_qdio_siosl - Trigger logging in FCP channel
487 * @adapter: The zfcp_adapter where to trigger logging
488 *
489 * Call the cio siosl function to trigger hardware logging. This
490 * wrapper function sets a flag to ensure hardware logging is only
491 * triggered once before going through qdio shutdown.
492 *
493 * The triggers are always run from qdio tasklet context, so no
494 * additional synchronization is necessary.
495 */
496void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
497{
498 int rc;
499
500 if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
501 return;
502
503 rc = ccw_device_siosl(adapter->ccw_device);
504 if (!rc)
505 atomic_or(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
506 &adapter->status);
507}
1/*
2 * zfcp device driver
3 *
4 * Setup and helper functions to access QDIO.
5 *
6 * Copyright IBM Corp. 2002, 2010
7 */
8
9#define KMSG_COMPONENT "zfcp"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/slab.h>
13#include <linux/module.h>
14#include "zfcp_ext.h"
15#include "zfcp_qdio.h"
16
17static bool enable_multibuffer = 1;
18module_param_named(datarouter, enable_multibuffer, bool, 0400);
19MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)");
20
21static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id,
22 unsigned int qdio_err)
23{
24 struct zfcp_adapter *adapter = qdio->adapter;
25
26 dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
27
28 if (qdio_err & QDIO_ERROR_SLSB_STATE) {
29 zfcp_qdio_siosl(adapter);
30 zfcp_erp_adapter_shutdown(adapter, 0, id);
31 return;
32 }
33 zfcp_erp_adapter_reopen(adapter,
34 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
35 ZFCP_STATUS_COMMON_ERP_FAILED, id);
36}
37
38static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
39{
40 int i, sbal_idx;
41
42 for (i = first; i < first + cnt; i++) {
43 sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
44 memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
45 }
46}
47
48/* this needs to be called prior to updating the queue fill level */
49static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
50{
51 unsigned long long now, span;
52 int used;
53
54 now = get_tod_clock_monotonic();
55 span = (now - qdio->req_q_time) >> 12;
56 used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
57 qdio->req_q_util += used * span;
58 qdio->req_q_time = now;
59}
60
61static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
62 int queue_no, int idx, int count,
63 unsigned long parm)
64{
65 struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
66
67 if (unlikely(qdio_err)) {
68 zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
69 return;
70 }
71
72 /* cleanup all SBALs being program-owned now */
73 zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
74
75 spin_lock_irq(&qdio->stat_lock);
76 zfcp_qdio_account(qdio);
77 spin_unlock_irq(&qdio->stat_lock);
78 atomic_add(count, &qdio->req_q_free);
79 wake_up(&qdio->req_q_wq);
80}
81
82static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
83 int queue_no, int idx, int count,
84 unsigned long parm)
85{
86 struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
87 struct zfcp_adapter *adapter = qdio->adapter;
88 int sbal_no, sbal_idx;
89
90 if (unlikely(qdio_err)) {
91 if (zfcp_adapter_multi_buffer_active(adapter)) {
92 void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
93 struct qdio_buffer_element *sbale;
94 u64 req_id;
95 u8 scount;
96
97 memset(pl, 0,
98 ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
99 sbale = qdio->res_q[idx]->element;
100 req_id = (u64) sbale->addr;
101 scount = min(sbale->scount + 1,
102 ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
103 /* incl. signaling SBAL */
104
105 for (sbal_no = 0; sbal_no < scount; sbal_no++) {
106 sbal_idx = (idx + sbal_no) %
107 QDIO_MAX_BUFFERS_PER_Q;
108 pl[sbal_no] = qdio->res_q[sbal_idx];
109 }
110 zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
111 }
112 zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
113 return;
114 }
115
116 /*
117 * go through all SBALs from input queue currently
118 * returned by QDIO layer
119 */
120 for (sbal_no = 0; sbal_no < count; sbal_no++) {
121 sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
122 /* go through all SBALEs of SBAL */
123 zfcp_fsf_reqid_check(qdio, sbal_idx);
124 }
125
126 /*
127 * put SBALs back to response queue
128 */
129 if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
130 zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
131}
132
133static struct qdio_buffer_element *
134zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
135{
136 struct qdio_buffer_element *sbale;
137
138 /* set last entry flag in current SBALE of current SBAL */
139 sbale = zfcp_qdio_sbale_curr(qdio, q_req);
140 sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY;
141
142 /* don't exceed last allowed SBAL */
143 if (q_req->sbal_last == q_req->sbal_limit)
144 return NULL;
145
146 /* set chaining flag in first SBALE of current SBAL */
147 sbale = zfcp_qdio_sbale_req(qdio, q_req);
148 sbale->sflags |= SBAL_SFLAGS0_MORE_SBALS;
149
150 /* calculate index of next SBAL */
151 q_req->sbal_last++;
152 q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
153
154 /* keep this requests number of SBALs up-to-date */
155 q_req->sbal_number++;
156 BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
157
158 /* start at first SBALE of new SBAL */
159 q_req->sbale_curr = 0;
160
161 /* set storage-block type for new SBAL */
162 sbale = zfcp_qdio_sbale_curr(qdio, q_req);
163 sbale->sflags |= q_req->sbtype;
164
165 return sbale;
166}
167
168static struct qdio_buffer_element *
169zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
170{
171 if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
172 return zfcp_qdio_sbal_chain(qdio, q_req);
173 q_req->sbale_curr++;
174 return zfcp_qdio_sbale_curr(qdio, q_req);
175}
176
177/**
178 * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
179 * @qdio: pointer to struct zfcp_qdio
180 * @q_req: pointer to struct zfcp_qdio_req
181 * @sg: scatter-gather list
182 * @max_sbals: upper bound for number of SBALs to be used
183 * Returns: zero or -EINVAL on error
184 */
185int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
186 struct scatterlist *sg)
187{
188 struct qdio_buffer_element *sbale;
189
190 /* set storage-block type for this request */
191 sbale = zfcp_qdio_sbale_req(qdio, q_req);
192 sbale->sflags |= q_req->sbtype;
193
194 for (; sg; sg = sg_next(sg)) {
195 sbale = zfcp_qdio_sbale_next(qdio, q_req);
196 if (!sbale) {
197 atomic_inc(&qdio->req_q_full);
198 zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
199 q_req->sbal_number);
200 return -EINVAL;
201 }
202 sbale->addr = sg_virt(sg);
203 sbale->length = sg->length;
204 }
205 return 0;
206}
207
208static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
209{
210 if (atomic_read(&qdio->req_q_free) ||
211 !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
212 return 1;
213 return 0;
214}
215
216/**
217 * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
218 * @qdio: pointer to struct zfcp_qdio
219 *
220 * The req_q_lock must be held by the caller of this function, and
221 * this function may only be called from process context; it will
222 * sleep when waiting for a free sbal.
223 *
224 * Returns: 0 on success, -EIO if there is no free sbal after waiting.
225 */
226int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
227{
228 long ret;
229
230 ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq,
231 zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ);
232
233 if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
234 return -EIO;
235
236 if (ret > 0)
237 return 0;
238
239 if (!ret) {
240 atomic_inc(&qdio->req_q_full);
241 /* assume hanging outbound queue, try queue recovery */
242 zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
243 }
244
245 return -EIO;
246}
247
248/**
249 * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
250 * @qdio: pointer to struct zfcp_qdio
251 * @q_req: pointer to struct zfcp_qdio_req
252 * Returns: 0 on success, error otherwise
253 */
254int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
255{
256 int retval;
257 u8 sbal_number = q_req->sbal_number;
258
259 spin_lock(&qdio->stat_lock);
260 zfcp_qdio_account(qdio);
261 spin_unlock(&qdio->stat_lock);
262
263 retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
264 q_req->sbal_first, sbal_number);
265
266 if (unlikely(retval)) {
267 zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
268 sbal_number);
269 return retval;
270 }
271
272 /* account for transferred buffers */
273 atomic_sub(sbal_number, &qdio->req_q_free);
274 qdio->req_q_idx += sbal_number;
275 qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
276
277 return 0;
278}
279
280
281static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
282 struct zfcp_qdio *qdio)
283{
284 memset(id, 0, sizeof(*id));
285 id->cdev = qdio->adapter->ccw_device;
286 id->q_format = QDIO_ZFCP_QFMT;
287 memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
288 ASCEBC(id->adapter_name, 8);
289 id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
290 if (enable_multibuffer)
291 id->qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
292 id->no_input_qs = 1;
293 id->no_output_qs = 1;
294 id->input_handler = zfcp_qdio_int_resp;
295 id->output_handler = zfcp_qdio_int_req;
296 id->int_parm = (unsigned long) qdio;
297 id->input_sbal_addr_array = (void **) (qdio->res_q);
298 id->output_sbal_addr_array = (void **) (qdio->req_q);
299 id->scan_threshold =
300 QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
301}
302
303/**
304 * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
305 * @adapter: pointer to struct zfcp_adapter
306 * Returns: -ENOMEM on memory allocation error or return value from
307 * qdio_allocate
308 */
309static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
310{
311 struct qdio_initialize init_data;
312 int ret;
313
314 ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
315 if (ret)
316 return -ENOMEM;
317
318 ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
319 if (ret)
320 goto free_req_q;
321
322 zfcp_qdio_setup_init_data(&init_data, qdio);
323 init_waitqueue_head(&qdio->req_q_wq);
324
325 ret = qdio_allocate(&init_data);
326 if (ret)
327 goto free_res_q;
328
329 return 0;
330
331free_res_q:
332 qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
333free_req_q:
334 qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
335 return ret;
336}
337
338/**
339 * zfcp_close_qdio - close qdio queues for an adapter
340 * @qdio: pointer to structure zfcp_qdio
341 */
342void zfcp_qdio_close(struct zfcp_qdio *qdio)
343{
344 struct zfcp_adapter *adapter = qdio->adapter;
345 int idx, count;
346
347 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
348 return;
349
350 /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
351 spin_lock_irq(&qdio->req_q_lock);
352 atomic_andnot(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
353 spin_unlock_irq(&qdio->req_q_lock);
354
355 wake_up(&qdio->req_q_wq);
356
357 qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
358
359 /* cleanup used outbound sbals */
360 count = atomic_read(&qdio->req_q_free);
361 if (count < QDIO_MAX_BUFFERS_PER_Q) {
362 idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
363 count = QDIO_MAX_BUFFERS_PER_Q - count;
364 zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
365 }
366 qdio->req_q_idx = 0;
367 atomic_set(&qdio->req_q_free, 0);
368}
369
370/**
371 * zfcp_qdio_open - prepare and initialize response queue
372 * @qdio: pointer to struct zfcp_qdio
373 * Returns: 0 on success, otherwise -EIO
374 */
375int zfcp_qdio_open(struct zfcp_qdio *qdio)
376{
377 struct qdio_buffer_element *sbale;
378 struct qdio_initialize init_data;
379 struct zfcp_adapter *adapter = qdio->adapter;
380 struct ccw_device *cdev = adapter->ccw_device;
381 struct qdio_ssqd_desc ssqd;
382 int cc;
383
384 if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
385 return -EIO;
386
387 atomic_andnot(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
388 &qdio->adapter->status);
389
390 zfcp_qdio_setup_init_data(&init_data, qdio);
391
392 if (qdio_establish(&init_data))
393 goto failed_establish;
394
395 if (qdio_get_ssqd_desc(init_data.cdev, &ssqd))
396 goto failed_qdio;
397
398 if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
399 atomic_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
400 &qdio->adapter->status);
401
402 if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
403 atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
404 qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
405 } else {
406 atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
407 qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
408 }
409
410 qdio->max_sbale_per_req =
411 ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
412 - 2;
413 if (qdio_activate(cdev))
414 goto failed_qdio;
415
416 for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
417 sbale = &(qdio->res_q[cc]->element[0]);
418 sbale->length = 0;
419 sbale->eflags = SBAL_EFLAGS_LAST_ENTRY;
420 sbale->sflags = 0;
421 sbale->addr = NULL;
422 }
423
424 if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
425 goto failed_qdio;
426
427 /* set index of first available SBALS / number of available SBALS */
428 qdio->req_q_idx = 0;
429 atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
430 atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
431
432 if (adapter->scsi_host) {
433 adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req;
434 adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8;
435 }
436
437 return 0;
438
439failed_qdio:
440 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
441failed_establish:
442 dev_err(&cdev->dev,
443 "Setting up the QDIO connection to the FCP adapter failed\n");
444 return -EIO;
445}
446
447void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
448{
449 if (!qdio)
450 return;
451
452 if (qdio->adapter->ccw_device)
453 qdio_free(qdio->adapter->ccw_device);
454
455 qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
456 qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
457 kfree(qdio);
458}
459
460int zfcp_qdio_setup(struct zfcp_adapter *adapter)
461{
462 struct zfcp_qdio *qdio;
463
464 qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
465 if (!qdio)
466 return -ENOMEM;
467
468 qdio->adapter = adapter;
469
470 if (zfcp_qdio_allocate(qdio)) {
471 kfree(qdio);
472 return -ENOMEM;
473 }
474
475 spin_lock_init(&qdio->req_q_lock);
476 spin_lock_init(&qdio->stat_lock);
477
478 adapter->qdio = qdio;
479 return 0;
480}
481
482/**
483 * zfcp_qdio_siosl - Trigger logging in FCP channel
484 * @adapter: The zfcp_adapter where to trigger logging
485 *
486 * Call the cio siosl function to trigger hardware logging. This
487 * wrapper function sets a flag to ensure hardware logging is only
488 * triggered once before going through qdio shutdown.
489 *
490 * The triggers are always run from qdio tasklet context, so no
491 * additional synchronization is necessary.
492 */
493void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
494{
495 int rc;
496
497 if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
498 return;
499
500 rc = ccw_device_siosl(adapter->ccw_device);
501 if (!rc)
502 atomic_or(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
503 &adapter->status);
504}