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