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Merge tag 'riscv-for-linus-4.15-rc2_cleanups' of git://git.kernel.org/pub/scm/linux...
[linux/fpc-iii.git] / drivers / s390 / cio / qdio_main.c
blob59b4a3370cd5d454cadc9e145bcb3a2dc9a321df
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Linux for s390 qdio support, buffer handling, qdio API and module support.
4 *
5 * Copyright IBM Corp. 2000, 2008
6 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
7 * Jan Glauber <jang@linux.vnet.ibm.com>
8 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
9 */
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/timer.h>
14 #include <linux/delay.h>
15 #include <linux/gfp.h>
16 #include <linux/io.h>
17 #include <linux/atomic.h>
18 #include <asm/debug.h>
19 #include <asm/qdio.h>
20 #include <asm/ipl.h>
21
22 #include "cio.h"
23 #include "css.h"
24 #include "device.h"
25 #include "qdio.h"
26 #include "qdio_debug.h"
27
28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
29 "Jan Glauber <jang@linux.vnet.ibm.com>");
30 MODULE_DESCRIPTION("QDIO base support");
31 MODULE_LICENSE("GPL");
32
33 static inline int do_siga_sync(unsigned long schid,
34 unsigned int out_mask, unsigned int in_mask,
35 unsigned int fc)
36 {
37 register unsigned long __fc asm ("0") = fc;
38 register unsigned long __schid asm ("1") = schid;
39 register unsigned long out asm ("2") = out_mask;
40 register unsigned long in asm ("3") = in_mask;
41 int cc;
42
43 asm volatile(
44 " siga 0\n"
45 " ipm %0\n"
46 " srl %0,28\n"
47 : "=d" (cc)
48 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
49 return cc;
50 }
51
52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
53 unsigned int fc)
54 {
55 register unsigned long __fc asm ("0") = fc;
56 register unsigned long __schid asm ("1") = schid;
57 register unsigned long __mask asm ("2") = mask;
58 int cc;
59
60 asm volatile(
61 " siga 0\n"
62 " ipm %0\n"
63 " srl %0,28\n"
64 : "=d" (cc)
65 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
66 return cc;
67 }
68
69 /**
70 * do_siga_output - perform SIGA-w/wt function
71 * @schid: subchannel id or in case of QEBSM the subchannel token
72 * @mask: which output queues to process
73 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
74 * @fc: function code to perform
75 *
76 * Returns condition code.
77 * Note: For IQDC unicast queues only the highest priority queue is processed.
78 */
79 static inline int do_siga_output(unsigned long schid, unsigned long mask,
80 unsigned int *bb, unsigned int fc,
81 unsigned long aob)
82 {
83 register unsigned long __fc asm("0") = fc;
84 register unsigned long __schid asm("1") = schid;
85 register unsigned long __mask asm("2") = mask;
86 register unsigned long __aob asm("3") = aob;
87 int cc;
88
89 asm volatile(
90 " siga 0\n"
91 " ipm %0\n"
92 " srl %0,28\n"
93 : "=d" (cc), "+d" (__fc), "+d" (__aob)
94 : "d" (__schid), "d" (__mask)
95 : "cc");
96 *bb = __fc >> 31;
97 return cc;
98 }
99
100 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
101 {
102 /* all done or next buffer state different */
103 if (ccq == 0 || ccq == 32)
104 return 0;
105 /* no buffer processed */
106 if (ccq == 97)
107 return 1;
108 /* not all buffers processed */
109 if (ccq == 96)
110 return 2;
111 /* notify devices immediately */
112 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
113 return -EIO;
114 }
115
116 /**
117 * qdio_do_eqbs - extract buffer states for QEBSM
118 * @q: queue to manipulate
119 * @state: state of the extracted buffers
120 * @start: buffer number to start at
121 * @count: count of buffers to examine
122 * @auto_ack: automatically acknowledge buffers
123 *
124 * Returns the number of successfully extracted equal buffer states.
125 * Stops processing if a state is different from the last buffers state.
126 */
127 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
128 int start, int count, int auto_ack)
129 {
130 int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
131 unsigned int ccq = 0;
132
133 qperf_inc(q, eqbs);
134
135 if (!q->is_input_q)
136 nr += q->irq_ptr->nr_input_qs;
137 again:
138 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
139 auto_ack);
140 rc = qdio_check_ccq(q, ccq);
141 if (!rc)
142 return count - tmp_count;
143
144 if (rc == 1) {
145 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
146 goto again;
147 }
148
149 if (rc == 2) {
150 qperf_inc(q, eqbs_partial);
151 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
152 tmp_count);
153 /*
154 * Retry once, if that fails bail out and process the
155 * extracted buffers before trying again.
156 */
157 if (!retried++)
158 goto again;
159 else
160 return count - tmp_count;
161 }
162
163 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
164 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
165 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE,
166 q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
167 return 0;
168 }
169
170 /**
171 * qdio_do_sqbs - set buffer states for QEBSM
172 * @q: queue to manipulate
173 * @state: new state of the buffers
174 * @start: first buffer number to change
175 * @count: how many buffers to change
176 *
177 * Returns the number of successfully changed buffers.
178 * Does retrying until the specified count of buffer states is set or an
179 * error occurs.
180 */
181 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
182 int count)
183 {
184 unsigned int ccq = 0;
185 int tmp_count = count, tmp_start = start;
186 int nr = q->nr;
187 int rc;
188
189 if (!count)
190 return 0;
191 qperf_inc(q, sqbs);
192
193 if (!q->is_input_q)
194 nr += q->irq_ptr->nr_input_qs;
195 again:
196 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
197 rc = qdio_check_ccq(q, ccq);
198 if (!rc) {
199 WARN_ON_ONCE(tmp_count);
200 return count - tmp_count;
201 }
202
203 if (rc == 1 || rc == 2) {
204 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
205 qperf_inc(q, sqbs_partial);
206 goto again;
207 }
208
209 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
210 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
211 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE,
212 q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
213 return 0;
214 }
215
216 /* returns number of examined buffers and their common state in *state */
217 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
218 unsigned char *state, unsigned int count,
219 int auto_ack, int merge_pending)
220 {
221 unsigned char __state = 0;
222 int i;
223
224 if (is_qebsm(q))
225 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
226
227 for (i = 0; i < count; i++) {
228 if (!__state) {
229 __state = q->slsb.val[bufnr];
230 if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
231 __state = SLSB_P_OUTPUT_EMPTY;
232 } else if (merge_pending) {
233 if ((q->slsb.val[bufnr] & __state) != __state)
234 break;
235 } else if (q->slsb.val[bufnr] != __state)
236 break;
237 bufnr = next_buf(bufnr);
238 }
239 *state = __state;
240 return i;
241 }
242
243 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
244 unsigned char *state, int auto_ack)
245 {
246 return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
247 }
248
249 /* wrap-around safe setting of slsb states, returns number of changed buffers */
250 static inline int set_buf_states(struct qdio_q *q, int bufnr,
251 unsigned char state, int count)
252 {
253 int i;
254
255 if (is_qebsm(q))
256 return qdio_do_sqbs(q, state, bufnr, count);
257
258 for (i = 0; i < count; i++) {
259 xchg(&q->slsb.val[bufnr], state);
260 bufnr = next_buf(bufnr);
261 }
262 return count;
263 }
264
265 static inline int set_buf_state(struct qdio_q *q, int bufnr,
266 unsigned char state)
267 {
268 return set_buf_states(q, bufnr, state, 1);
269 }
270
271 /* set slsb states to initial state */
272 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
273 {
274 struct qdio_q *q;
275 int i;
276
277 for_each_input_queue(irq_ptr, q, i)
278 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
279 QDIO_MAX_BUFFERS_PER_Q);
280 for_each_output_queue(irq_ptr, q, i)
281 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
282 QDIO_MAX_BUFFERS_PER_Q);
283 }
284
285 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
286 unsigned int input)
287 {
288 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
289 unsigned int fc = QDIO_SIGA_SYNC;
290 int cc;
291
292 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
293 qperf_inc(q, siga_sync);
294
295 if (is_qebsm(q)) {
296 schid = q->irq_ptr->sch_token;
297 fc |= QDIO_SIGA_QEBSM_FLAG;
298 }
299
300 cc = do_siga_sync(schid, output, input, fc);
301 if (unlikely(cc))
302 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
303 return (cc) ? -EIO : 0;
304 }
305
306 static inline int qdio_siga_sync_q(struct qdio_q *q)
307 {
308 if (q->is_input_q)
309 return qdio_siga_sync(q, 0, q->mask);
310 else
311 return qdio_siga_sync(q, q->mask, 0);
312 }
313
314 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
315 unsigned long aob)
316 {
317 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
318 unsigned int fc = QDIO_SIGA_WRITE;
319 u64 start_time = 0;
320 int retries = 0, cc;
321 unsigned long laob = 0;
322
323 WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
324 !q->u.out.use_cq));
325 if (q->u.out.use_cq && aob != 0) {
326 fc = QDIO_SIGA_WRITEQ;
327 laob = aob;
328 }
329
330 if (is_qebsm(q)) {
331 schid = q->irq_ptr->sch_token;
332 fc |= QDIO_SIGA_QEBSM_FLAG;
333 }
334 again:
335 cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
336
337 /* hipersocket busy condition */
338 if (unlikely(*busy_bit)) {
339 retries++;
340
341 if (!start_time) {
342 start_time = get_tod_clock_fast();
343 goto again;
344 }
345 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
346 goto again;
347 }
348 if (retries) {
349 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
350 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
351 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
352 }
353 return cc;
354 }
355
356 static inline int qdio_siga_input(struct qdio_q *q)
357 {
358 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
359 unsigned int fc = QDIO_SIGA_READ;
360 int cc;
361
362 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
363 qperf_inc(q, siga_read);
364
365 if (is_qebsm(q)) {
366 schid = q->irq_ptr->sch_token;
367 fc |= QDIO_SIGA_QEBSM_FLAG;
368 }
369
370 cc = do_siga_input(schid, q->mask, fc);
371 if (unlikely(cc))
372 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
373 return (cc) ? -EIO : 0;
374 }
375
376 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
377 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
378
379 static inline void qdio_sync_queues(struct qdio_q *q)
380 {
381 /* PCI capable outbound queues will also be scanned so sync them too */
382 if (pci_out_supported(q))
383 qdio_siga_sync_all(q);
384 else
385 qdio_siga_sync_q(q);
386 }
387
388 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
389 unsigned char *state)
390 {
391 if (need_siga_sync(q))
392 qdio_siga_sync_q(q);
393 return get_buf_states(q, bufnr, state, 1, 0, 0);
394 }
395
396 static inline void qdio_stop_polling(struct qdio_q *q)
397 {
398 if (!q->u.in.polling)
399 return;
400
401 q->u.in.polling = 0;
402 qperf_inc(q, stop_polling);
403
404 /* show the card that we are not polling anymore */
405 if (is_qebsm(q)) {
406 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
407 q->u.in.ack_count);
408 q->u.in.ack_count = 0;
409 } else
410 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
411 }
412
413 static inline void account_sbals(struct qdio_q *q, unsigned int count)
414 {
415 int pos;
416
417 q->q_stats.nr_sbal_total += count;
418 if (count == QDIO_MAX_BUFFERS_MASK) {
419 q->q_stats.nr_sbals[7]++;
420 return;
421 }
422 pos = ilog2(count);
423 q->q_stats.nr_sbals[pos]++;
424 }
425
426 static void process_buffer_error(struct qdio_q *q, int count)
427 {
428 unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
429 SLSB_P_OUTPUT_NOT_INIT;
430
431 q->qdio_error = QDIO_ERROR_SLSB_STATE;
432
433 /* special handling for no target buffer empty */
434 if ((!q->is_input_q &&
435 (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
436 qperf_inc(q, target_full);
437 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
438 q->first_to_check);
439 goto set;
440 }
441
442 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
443 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
444 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
445 DBF_ERROR("F14:%2x F15:%2x",
446 q->sbal[q->first_to_check]->element[14].sflags,
447 q->sbal[q->first_to_check]->element[15].sflags);
448
449 set:
450 /*
451 * Interrupts may be avoided as long as the error is present
452 * so change the buffer state immediately to avoid starvation.
453 */
454 set_buf_states(q, q->first_to_check, state, count);
455 }
456
457 static inline void inbound_primed(struct qdio_q *q, int count)
458 {
459 int new;
460
461 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count);
462
463 /* for QEBSM the ACK was already set by EQBS */
464 if (is_qebsm(q)) {
465 if (!q->u.in.polling) {
466 q->u.in.polling = 1;
467 q->u.in.ack_count = count;
468 q->u.in.ack_start = q->first_to_check;
469 return;
470 }
471
472 /* delete the previous ACK's */
473 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
474 q->u.in.ack_count);
475 q->u.in.ack_count = count;
476 q->u.in.ack_start = q->first_to_check;
477 return;
478 }
479
480 /*
481 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
482 * or by the next inbound run.
483 */
484 new = add_buf(q->first_to_check, count - 1);
485 if (q->u.in.polling) {
486 /* reset the previous ACK but first set the new one */
487 set_buf_state(q, new, SLSB_P_INPUT_ACK);
488 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
489 } else {
490 q->u.in.polling = 1;
491 set_buf_state(q, new, SLSB_P_INPUT_ACK);
492 }
493
494 q->u.in.ack_start = new;
495 count--;
496 if (!count)
497 return;
498 /* need to change ALL buffers to get more interrupts */
499 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
500 }
501
502 static int get_inbound_buffer_frontier(struct qdio_q *q)
503 {
504 int count, stop;
505 unsigned char state = 0;
506
507 q->timestamp = get_tod_clock_fast();
508
509 /*
510 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
511 * would return 0.
512 */
513 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
514 stop = add_buf(q->first_to_check, count);
515
516 if (q->first_to_check == stop)
517 goto out;
518
519 /*
520 * No siga sync here, as a PCI or we after a thin interrupt
521 * already sync'ed the queues.
522 */
523 count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
524 if (!count)
525 goto out;
526
527 switch (state) {
528 case SLSB_P_INPUT_PRIMED:
529 inbound_primed(q, count);
530 q->first_to_check = add_buf(q->first_to_check, count);
531 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
532 qperf_inc(q, inbound_queue_full);
533 if (q->irq_ptr->perf_stat_enabled)
534 account_sbals(q, count);
535 break;
536 case SLSB_P_INPUT_ERROR:
537 process_buffer_error(q, count);
538 q->first_to_check = add_buf(q->first_to_check, count);
539 atomic_sub(count, &q->nr_buf_used);
540 if (q->irq_ptr->perf_stat_enabled)
541 account_sbals_error(q, count);
542 break;
543 case SLSB_CU_INPUT_EMPTY:
544 case SLSB_P_INPUT_NOT_INIT:
545 case SLSB_P_INPUT_ACK:
546 if (q->irq_ptr->perf_stat_enabled)
547 q->q_stats.nr_sbal_nop++;
548 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
549 q->nr, q->first_to_check);
550 break;
551 default:
552 WARN_ON_ONCE(1);
553 }
554 out:
555 return q->first_to_check;
556 }
557
558 static int qdio_inbound_q_moved(struct qdio_q *q)
559 {
560 int bufnr;
561
562 bufnr = get_inbound_buffer_frontier(q);
563
564 if (bufnr != q->last_move) {
565 q->last_move = bufnr;
566 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
567 q->u.in.timestamp = get_tod_clock();
568 return 1;
569 } else
570 return 0;
571 }
572
573 static inline int qdio_inbound_q_done(struct qdio_q *q)
574 {
575 unsigned char state = 0;
576
577 if (!atomic_read(&q->nr_buf_used))
578 return 1;
579
580 if (need_siga_sync(q))
581 qdio_siga_sync_q(q);
582 get_buf_state(q, q->first_to_check, &state, 0);
583
584 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
585 /* more work coming */
586 return 0;
587
588 if (is_thinint_irq(q->irq_ptr))
589 return 1;
590
591 /* don't poll under z/VM */
592 if (MACHINE_IS_VM)
593 return 1;
594
595 /*
596 * At this point we know, that inbound first_to_check
597 * has (probably) not moved (see qdio_inbound_processing).
598 */
599 if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
600 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
601 q->first_to_check);
602 return 1;
603 } else
604 return 0;
605 }
606
607 static inline int contains_aobs(struct qdio_q *q)
608 {
609 return !q->is_input_q && q->u.out.use_cq;
610 }
611
612 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
613 {
614 unsigned char state = 0;
615 int j, b = start;
616
617 if (!contains_aobs(q))
618 return;
619
620 for (j = 0; j < count; ++j) {
621 get_buf_state(q, b, &state, 0);
622 if (state == SLSB_P_OUTPUT_PENDING) {
623 struct qaob *aob = q->u.out.aobs[b];
624 if (aob == NULL)
625 continue;
626
627 q->u.out.sbal_state[b].flags |=
628 QDIO_OUTBUF_STATE_FLAG_PENDING;
629 q->u.out.aobs[b] = NULL;
630 } else if (state == SLSB_P_OUTPUT_EMPTY) {
631 q->u.out.sbal_state[b].aob = NULL;
632 }
633 b = next_buf(b);
634 }
635 }
636
637 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
638 int bufnr)
639 {
640 unsigned long phys_aob = 0;
641
642 if (!q->use_cq)
643 goto out;
644
645 if (!q->aobs[bufnr]) {
646 struct qaob *aob = qdio_allocate_aob();
647 q->aobs[bufnr] = aob;
648 }
649 if (q->aobs[bufnr]) {
650 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
651 q->sbal_state[bufnr].aob = q->aobs[bufnr];
652 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
653 phys_aob = virt_to_phys(q->aobs[bufnr]);
654 WARN_ON_ONCE(phys_aob & 0xFF);
655 }
656
657 out:
658 return phys_aob;
659 }
660
661 static void qdio_kick_handler(struct qdio_q *q)
662 {
663 int start = q->first_to_kick;
664 int end = q->first_to_check;
665 int count;
666
667 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
668 return;
669
670 count = sub_buf(end, start);
671
672 if (q->is_input_q) {
673 qperf_inc(q, inbound_handler);
674 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
675 } else {
676 qperf_inc(q, outbound_handler);
677 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
678 start, count);
679 }
680
681 qdio_handle_aobs(q, start, count);
682
683 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
684 q->irq_ptr->int_parm);
685
686 /* for the next time */
687 q->first_to_kick = end;
688 q->qdio_error = 0;
689 }
690
691 static inline int qdio_tasklet_schedule(struct qdio_q *q)
692 {
693 if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
694 tasklet_schedule(&q->tasklet);
695 return 0;
696 }
697 return -EPERM;
698 }
699
700 static void __qdio_inbound_processing(struct qdio_q *q)
701 {
702 qperf_inc(q, tasklet_inbound);
703
704 if (!qdio_inbound_q_moved(q))
705 return;
706
707 qdio_kick_handler(q);
708
709 if (!qdio_inbound_q_done(q)) {
710 /* means poll time is not yet over */
711 qperf_inc(q, tasklet_inbound_resched);
712 if (!qdio_tasklet_schedule(q))
713 return;
714 }
715
716 qdio_stop_polling(q);
717 /*
718 * We need to check again to not lose initiative after
719 * resetting the ACK state.
720 */
721 if (!qdio_inbound_q_done(q)) {
722 qperf_inc(q, tasklet_inbound_resched2);
723 qdio_tasklet_schedule(q);
724 }
725 }
726
727 void qdio_inbound_processing(unsigned long data)
728 {
729 struct qdio_q *q = (struct qdio_q *)data;
730 __qdio_inbound_processing(q);
731 }
732
733 static int get_outbound_buffer_frontier(struct qdio_q *q)
734 {
735 int count, stop;
736 unsigned char state = 0;
737
738 q->timestamp = get_tod_clock_fast();
739
740 if (need_siga_sync(q))
741 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
742 !pci_out_supported(q)) ||
743 (queue_type(q) == QDIO_IQDIO_QFMT &&
744 multicast_outbound(q)))
745 qdio_siga_sync_q(q);
746
747 /*
748 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
749 * would return 0.
750 */
751 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
752 stop = add_buf(q->first_to_check, count);
753 if (q->first_to_check == stop)
754 goto out;
755
756 count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
757 if (!count)
758 goto out;
759
760 switch (state) {
761 case SLSB_P_OUTPUT_EMPTY:
762 /* the adapter got it */
763 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
764 "out empty:%1d %02x", q->nr, count);
765
766 atomic_sub(count, &q->nr_buf_used);
767 q->first_to_check = add_buf(q->first_to_check, count);
768 if (q->irq_ptr->perf_stat_enabled)
769 account_sbals(q, count);
770
771 break;
772 case SLSB_P_OUTPUT_ERROR:
773 process_buffer_error(q, count);
774 q->first_to_check = add_buf(q->first_to_check, count);
775 atomic_sub(count, &q->nr_buf_used);
776 if (q->irq_ptr->perf_stat_enabled)
777 account_sbals_error(q, count);
778 break;
779 case SLSB_CU_OUTPUT_PRIMED:
780 /* the adapter has not fetched the output yet */
781 if (q->irq_ptr->perf_stat_enabled)
782 q->q_stats.nr_sbal_nop++;
783 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
784 q->nr);
785 break;
786 case SLSB_P_OUTPUT_NOT_INIT:
787 case SLSB_P_OUTPUT_HALTED:
788 break;
789 default:
790 WARN_ON_ONCE(1);
791 }
792
793 out:
794 return q->first_to_check;
795 }
796
797 /* all buffers processed? */
798 static inline int qdio_outbound_q_done(struct qdio_q *q)
799 {
800 return atomic_read(&q->nr_buf_used) == 0;
801 }
802
803 static inline int qdio_outbound_q_moved(struct qdio_q *q)
804 {
805 int bufnr;
806
807 bufnr = get_outbound_buffer_frontier(q);
808
809 if (bufnr != q->last_move) {
810 q->last_move = bufnr;
811 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
812 return 1;
813 } else
814 return 0;
815 }
816
817 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
818 {
819 int retries = 0, cc;
820 unsigned int busy_bit;
821
822 if (!need_siga_out(q))
823 return 0;
824
825 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
826 retry:
827 qperf_inc(q, siga_write);
828
829 cc = qdio_siga_output(q, &busy_bit, aob);
830 switch (cc) {
831 case 0:
832 break;
833 case 2:
834 if (busy_bit) {
835 while (++retries < QDIO_BUSY_BIT_RETRIES) {
836 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
837 goto retry;
838 }
839 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
840 cc = -EBUSY;
841 } else {
842 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
843 cc = -ENOBUFS;
844 }
845 break;
846 case 1:
847 case 3:
848 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
849 cc = -EIO;
850 break;
851 }
852 if (retries) {
853 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
854 DBF_ERROR("count:%u", retries);
855 }
856 return cc;
857 }
858
859 static void __qdio_outbound_processing(struct qdio_q *q)
860 {
861 qperf_inc(q, tasklet_outbound);
862 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
863
864 if (qdio_outbound_q_moved(q))
865 qdio_kick_handler(q);
866
867 if (queue_type(q) == QDIO_ZFCP_QFMT)
868 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
869 goto sched;
870
871 if (q->u.out.pci_out_enabled)
872 return;
873
874 /*
875 * Now we know that queue type is either qeth without pci enabled
876 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
877 * is noticed and outbound_handler is called after some time.
878 */
879 if (qdio_outbound_q_done(q))
880 del_timer_sync(&q->u.out.timer);
881 else
882 if (!timer_pending(&q->u.out.timer) &&
883 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
884 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
885 return;
886
887 sched:
888 qdio_tasklet_schedule(q);
889 }
890
891 /* outbound tasklet */
892 void qdio_outbound_processing(unsigned long data)
893 {
894 struct qdio_q *q = (struct qdio_q *)data;
895 __qdio_outbound_processing(q);
896 }
897
898 void qdio_outbound_timer(struct timer_list *t)
899 {
900 struct qdio_q *q = from_timer(q, t, u.out.timer);
901
902 qdio_tasklet_schedule(q);
903 }
904
905 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
906 {
907 struct qdio_q *out;
908 int i;
909
910 if (!pci_out_supported(q))
911 return;
912
913 for_each_output_queue(q->irq_ptr, out, i)
914 if (!qdio_outbound_q_done(out))
915 qdio_tasklet_schedule(out);
916 }
917
918 static void __tiqdio_inbound_processing(struct qdio_q *q)
919 {
920 qperf_inc(q, tasklet_inbound);
921 if (need_siga_sync(q) && need_siga_sync_after_ai(q))
922 qdio_sync_queues(q);
923
924 /*
925 * The interrupt could be caused by a PCI request. Check the
926 * PCI capable outbound queues.
927 */
928 qdio_check_outbound_after_thinint(q);
929
930 if (!qdio_inbound_q_moved(q))
931 return;
932
933 qdio_kick_handler(q);
934
935 if (!qdio_inbound_q_done(q)) {
936 qperf_inc(q, tasklet_inbound_resched);
937 if (!qdio_tasklet_schedule(q))
938 return;
939 }
940
941 qdio_stop_polling(q);
942 /*
943 * We need to check again to not lose initiative after
944 * resetting the ACK state.
945 */
946 if (!qdio_inbound_q_done(q)) {
947 qperf_inc(q, tasklet_inbound_resched2);
948 qdio_tasklet_schedule(q);
949 }
950 }
951
952 void tiqdio_inbound_processing(unsigned long data)
953 {
954 struct qdio_q *q = (struct qdio_q *)data;
955 __tiqdio_inbound_processing(q);
956 }
957
958 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
959 enum qdio_irq_states state)
960 {
961 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
962
963 irq_ptr->state = state;
964 mb();
965 }
966
967 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
968 {
969 if (irb->esw.esw0.erw.cons) {
970 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
971 DBF_ERROR_HEX(irb, 64);
972 DBF_ERROR_HEX(irb->ecw, 64);
973 }
974 }
975
976 /* PCI interrupt handler */
977 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
978 {
979 int i;
980 struct qdio_q *q;
981
982 if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
983 return;
984
985 for_each_input_queue(irq_ptr, q, i) {
986 if (q->u.in.queue_start_poll) {
987 /* skip if polling is enabled or already in work */
988 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
989 &q->u.in.queue_irq_state)) {
990 qperf_inc(q, int_discarded);
991 continue;
992 }
993 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
994 q->irq_ptr->int_parm);
995 } else {
996 tasklet_schedule(&q->tasklet);
997 }
998 }
999
1000 if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
1001 return;
1002
1003 for_each_output_queue(irq_ptr, q, i) {
1004 if (qdio_outbound_q_done(q))
1005 continue;
1006 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1007 qdio_siga_sync_q(q);
1008 qdio_tasklet_schedule(q);
1009 }
1010 }
1011
1012 static void qdio_handle_activate_check(struct ccw_device *cdev,
1013 unsigned long intparm, int cstat, int dstat)
1014 {
1015 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1016 struct qdio_q *q;
1017 int count;
1018
1019 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1020 DBF_ERROR("intp :%lx", intparm);
1021 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1022
1023 if (irq_ptr->nr_input_qs) {
1024 q = irq_ptr->input_qs[0];
1025 } else if (irq_ptr->nr_output_qs) {
1026 q = irq_ptr->output_qs[0];
1027 } else {
1028 dump_stack();
1029 goto no_handler;
1030 }
1031
1032 count = sub_buf(q->first_to_check, q->first_to_kick);
1033 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1034 q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1035 no_handler:
1036 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1037 /*
1038 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1039 * Therefore we call the LGR detection function here.
1040 */
1041 lgr_info_log();
1042 }
1043
1044 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1045 int dstat)
1046 {
1047 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1048
1049 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1050
1051 if (cstat)
1052 goto error;
1053 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1054 goto error;
1055 if (!(dstat & DEV_STAT_DEV_END))
1056 goto error;
1057 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1058 return;
1059
1060 error:
1061 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1062 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1063 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1064 }
1065
1066 /* qdio interrupt handler */
1067 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1068 struct irb *irb)
1069 {
1070 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1071 struct subchannel_id schid;
1072 int cstat, dstat;
1073
1074 if (!intparm || !irq_ptr) {
1075 ccw_device_get_schid(cdev, &schid);
1076 DBF_ERROR("qint:%4x", schid.sch_no);
1077 return;
1078 }
1079
1080 if (irq_ptr->perf_stat_enabled)
1081 irq_ptr->perf_stat.qdio_int++;
1082
1083 if (IS_ERR(irb)) {
1084 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1085 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1086 wake_up(&cdev->private->wait_q);
1087 return;
1088 }
1089 qdio_irq_check_sense(irq_ptr, irb);
1090 cstat = irb->scsw.cmd.cstat;
1091 dstat = irb->scsw.cmd.dstat;
1092
1093 switch (irq_ptr->state) {
1094 case QDIO_IRQ_STATE_INACTIVE:
1095 qdio_establish_handle_irq(cdev, cstat, dstat);
1096 break;
1097 case QDIO_IRQ_STATE_CLEANUP:
1098 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1099 break;
1100 case QDIO_IRQ_STATE_ESTABLISHED:
1101 case QDIO_IRQ_STATE_ACTIVE:
1102 if (cstat & SCHN_STAT_PCI) {
1103 qdio_int_handler_pci(irq_ptr);
1104 return;
1105 }
1106 if (cstat || dstat)
1107 qdio_handle_activate_check(cdev, intparm, cstat,
1108 dstat);
1109 break;
1110 case QDIO_IRQ_STATE_STOPPED:
1111 break;
1112 default:
1113 WARN_ON_ONCE(1);
1114 }
1115 wake_up(&cdev->private->wait_q);
1116 }
1117
1118 /**
1119 * qdio_get_ssqd_desc - get qdio subchannel description
1120 * @cdev: ccw device to get description for
1121 * @data: where to store the ssqd
1122 *
1123 * Returns 0 or an error code. The results of the chsc are stored in the
1124 * specified structure.
1125 */
1126 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1127 struct qdio_ssqd_desc *data)
1128 {
1129 struct subchannel_id schid;
1130
1131 if (!cdev || !cdev->private)
1132 return -EINVAL;
1133
1134 ccw_device_get_schid(cdev, &schid);
1135 DBF_EVENT("get ssqd:%4x", schid.sch_no);
1136 return qdio_setup_get_ssqd(NULL, &schid, data);
1137 }
1138 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1139
1140 static void qdio_shutdown_queues(struct ccw_device *cdev)
1141 {
1142 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1143 struct qdio_q *q;
1144 int i;
1145
1146 for_each_input_queue(irq_ptr, q, i)
1147 tasklet_kill(&q->tasklet);
1148
1149 for_each_output_queue(irq_ptr, q, i) {
1150 del_timer_sync(&q->u.out.timer);
1151 tasklet_kill(&q->tasklet);
1152 }
1153 }
1154
1155 /**
1156 * qdio_shutdown - shut down a qdio subchannel
1157 * @cdev: associated ccw device
1158 * @how: use halt or clear to shutdown
1159 */
1160 int qdio_shutdown(struct ccw_device *cdev, int how)
1161 {
1162 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1163 struct subchannel_id schid;
1164 int rc;
1165
1166 if (!irq_ptr)
1167 return -ENODEV;
1168
1169 WARN_ON_ONCE(irqs_disabled());
1170 ccw_device_get_schid(cdev, &schid);
1171 DBF_EVENT("qshutdown:%4x", schid.sch_no);
1172
1173 mutex_lock(&irq_ptr->setup_mutex);
1174 /*
1175 * Subchannel was already shot down. We cannot prevent being called
1176 * twice since cio may trigger a shutdown asynchronously.
1177 */
1178 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1179 mutex_unlock(&irq_ptr->setup_mutex);
1180 return 0;
1181 }
1182
1183 /*
1184 * Indicate that the device is going down. Scheduling the queue
1185 * tasklets is forbidden from here on.
1186 */
1187 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1188
1189 tiqdio_remove_input_queues(irq_ptr);
1190 qdio_shutdown_queues(cdev);
1191 qdio_shutdown_debug_entries(irq_ptr);
1192
1193 /* cleanup subchannel */
1194 spin_lock_irq(get_ccwdev_lock(cdev));
1195
1196 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1197 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1198 else
1199 /* default behaviour is halt */
1200 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1201 if (rc) {
1202 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1203 DBF_ERROR("rc:%4d", rc);
1204 goto no_cleanup;
1205 }
1206
1207 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1208 spin_unlock_irq(get_ccwdev_lock(cdev));
1209 wait_event_interruptible_timeout(cdev->private->wait_q,
1210 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1211 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1212 10 * HZ);
1213 spin_lock_irq(get_ccwdev_lock(cdev));
1214
1215 no_cleanup:
1216 qdio_shutdown_thinint(irq_ptr);
1217
1218 /* restore interrupt handler */
1219 if ((void *)cdev->handler == (void *)qdio_int_handler)
1220 cdev->handler = irq_ptr->orig_handler;
1221 spin_unlock_irq(get_ccwdev_lock(cdev));
1222
1223 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1224 mutex_unlock(&irq_ptr->setup_mutex);
1225 if (rc)
1226 return rc;
1227 return 0;
1228 }
1229 EXPORT_SYMBOL_GPL(qdio_shutdown);
1230
1231 /**
1232 * qdio_free - free data structures for a qdio subchannel
1233 * @cdev: associated ccw device
1234 */
1235 int qdio_free(struct ccw_device *cdev)
1236 {
1237 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1238 struct subchannel_id schid;
1239
1240 if (!irq_ptr)
1241 return -ENODEV;
1242
1243 ccw_device_get_schid(cdev, &schid);
1244 DBF_EVENT("qfree:%4x", schid.sch_no);
1245 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1246 mutex_lock(&irq_ptr->setup_mutex);
1247
1248 irq_ptr->debug_area = NULL;
1249 cdev->private->qdio_data = NULL;
1250 mutex_unlock(&irq_ptr->setup_mutex);
1251
1252 qdio_release_memory(irq_ptr);
1253 return 0;
1254 }
1255 EXPORT_SYMBOL_GPL(qdio_free);
1256
1257 /**
1258 * qdio_allocate - allocate qdio queues and associated data
1259 * @init_data: initialization data
1260 */
1261 int qdio_allocate(struct qdio_initialize *init_data)
1262 {
1263 struct subchannel_id schid;
1264 struct qdio_irq *irq_ptr;
1265
1266 ccw_device_get_schid(init_data->cdev, &schid);
1267 DBF_EVENT("qallocate:%4x", schid.sch_no);
1268
1269 if ((init_data->no_input_qs && !init_data->input_handler) ||
1270 (init_data->no_output_qs && !init_data->output_handler))
1271 return -EINVAL;
1272
1273 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1274 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1275 return -EINVAL;
1276
1277 if ((!init_data->input_sbal_addr_array) ||
1278 (!init_data->output_sbal_addr_array))
1279 return -EINVAL;
1280
1281 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1282 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1283 if (!irq_ptr)
1284 goto out_err;
1285
1286 mutex_init(&irq_ptr->setup_mutex);
1287 if (qdio_allocate_dbf(init_data, irq_ptr))
1288 goto out_rel;
1289
1290 /*
1291 * Allocate a page for the chsc calls in qdio_establish.
1292 * Must be pre-allocated since a zfcp recovery will call
1293 * qdio_establish. In case of low memory and swap on a zfcp disk
1294 * we may not be able to allocate memory otherwise.
1295 */
1296 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1297 if (!irq_ptr->chsc_page)
1298 goto out_rel;
1299
1300 /* qdr is used in ccw1.cda which is u32 */
1301 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1302 if (!irq_ptr->qdr)
1303 goto out_rel;
1304
1305 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1306 init_data->no_output_qs))
1307 goto out_rel;
1308
1309 init_data->cdev->private->qdio_data = irq_ptr;
1310 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1311 return 0;
1312 out_rel:
1313 qdio_release_memory(irq_ptr);
1314 out_err:
1315 return -ENOMEM;
1316 }
1317 EXPORT_SYMBOL_GPL(qdio_allocate);
1318
1319 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1320 {
1321 struct qdio_q *q = irq_ptr->input_qs[0];
1322 int i, use_cq = 0;
1323
1324 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1325 use_cq = 1;
1326
1327 for_each_output_queue(irq_ptr, q, i) {
1328 if (use_cq) {
1329 if (qdio_enable_async_operation(&q->u.out) < 0) {
1330 use_cq = 0;
1331 continue;
1332 }
1333 } else
1334 qdio_disable_async_operation(&q->u.out);
1335 }
1336 DBF_EVENT("use_cq:%d", use_cq);
1337 }
1338
1339 /**
1340 * qdio_establish - establish queues on a qdio subchannel
1341 * @init_data: initialization data
1342 */
1343 int qdio_establish(struct qdio_initialize *init_data)
1344 {
1345 struct ccw_device *cdev = init_data->cdev;
1346 struct subchannel_id schid;
1347 struct qdio_irq *irq_ptr;
1348 int rc;
1349
1350 ccw_device_get_schid(cdev, &schid);
1351 DBF_EVENT("qestablish:%4x", schid.sch_no);
1352
1353 irq_ptr = cdev->private->qdio_data;
1354 if (!irq_ptr)
1355 return -ENODEV;
1356
1357 mutex_lock(&irq_ptr->setup_mutex);
1358 qdio_setup_irq(init_data);
1359
1360 rc = qdio_establish_thinint(irq_ptr);
1361 if (rc) {
1362 mutex_unlock(&irq_ptr->setup_mutex);
1363 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1364 return rc;
1365 }
1366
1367 /* establish q */
1368 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1369 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1370 irq_ptr->ccw.count = irq_ptr->equeue.count;
1371 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1372
1373 spin_lock_irq(get_ccwdev_lock(cdev));
1374 ccw_device_set_options_mask(cdev, 0);
1375
1376 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1377 spin_unlock_irq(get_ccwdev_lock(cdev));
1378 if (rc) {
1379 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1380 DBF_ERROR("rc:%4x", rc);
1381 mutex_unlock(&irq_ptr->setup_mutex);
1382 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1383 return rc;
1384 }
1385
1386 wait_event_interruptible_timeout(cdev->private->wait_q,
1387 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1388 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1389
1390 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1391 mutex_unlock(&irq_ptr->setup_mutex);
1392 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1393 return -EIO;
1394 }
1395
1396 qdio_setup_ssqd_info(irq_ptr);
1397
1398 qdio_detect_hsicq(irq_ptr);
1399
1400 /* qebsm is now setup if available, initialize buffer states */
1401 qdio_init_buf_states(irq_ptr);
1402
1403 mutex_unlock(&irq_ptr->setup_mutex);
1404 qdio_print_subchannel_info(irq_ptr, cdev);
1405 qdio_setup_debug_entries(irq_ptr, cdev);
1406 return 0;
1407 }
1408 EXPORT_SYMBOL_GPL(qdio_establish);
1409
1410 /**
1411 * qdio_activate - activate queues on a qdio subchannel
1412 * @cdev: associated cdev
1413 */
1414 int qdio_activate(struct ccw_device *cdev)
1415 {
1416 struct subchannel_id schid;
1417 struct qdio_irq *irq_ptr;
1418 int rc;
1419
1420 ccw_device_get_schid(cdev, &schid);
1421 DBF_EVENT("qactivate:%4x", schid.sch_no);
1422
1423 irq_ptr = cdev->private->qdio_data;
1424 if (!irq_ptr)
1425 return -ENODEV;
1426
1427 mutex_lock(&irq_ptr->setup_mutex);
1428 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1429 rc = -EBUSY;
1430 goto out;
1431 }
1432
1433 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1434 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1435 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1436 irq_ptr->ccw.cda = 0;
1437
1438 spin_lock_irq(get_ccwdev_lock(cdev));
1439 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1440
1441 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1442 0, DOIO_DENY_PREFETCH);
1443 spin_unlock_irq(get_ccwdev_lock(cdev));
1444 if (rc) {
1445 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1446 DBF_ERROR("rc:%4x", rc);
1447 goto out;
1448 }
1449
1450 if (is_thinint_irq(irq_ptr))
1451 tiqdio_add_input_queues(irq_ptr);
1452
1453 /* wait for subchannel to become active */
1454 msleep(5);
1455
1456 switch (irq_ptr->state) {
1457 case QDIO_IRQ_STATE_STOPPED:
1458 case QDIO_IRQ_STATE_ERR:
1459 rc = -EIO;
1460 break;
1461 default:
1462 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1463 rc = 0;
1464 }
1465 out:
1466 mutex_unlock(&irq_ptr->setup_mutex);
1467 return rc;
1468 }
1469 EXPORT_SYMBOL_GPL(qdio_activate);
1470
1471 static inline int buf_in_between(int bufnr, int start, int count)
1472 {
1473 int end = add_buf(start, count);
1474
1475 if (end > start) {
1476 if (bufnr >= start && bufnr < end)
1477 return 1;
1478 else
1479 return 0;
1480 }
1481
1482 /* wrap-around case */
1483 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1484 (bufnr < end))
1485 return 1;
1486 else
1487 return 0;
1488 }
1489
1490 /**
1491 * handle_inbound - reset processed input buffers
1492 * @q: queue containing the buffers
1493 * @callflags: flags
1494 * @bufnr: first buffer to process
1495 * @count: how many buffers are emptied
1496 */
1497 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1498 int bufnr, int count)
1499 {
1500 int diff;
1501
1502 qperf_inc(q, inbound_call);
1503
1504 if (!q->u.in.polling)
1505 goto set;
1506
1507 /* protect against stop polling setting an ACK for an emptied slsb */
1508 if (count == QDIO_MAX_BUFFERS_PER_Q) {
1509 /* overwriting everything, just delete polling status */
1510 q->u.in.polling = 0;
1511 q->u.in.ack_count = 0;
1512 goto set;
1513 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1514 if (is_qebsm(q)) {
1515 /* partial overwrite, just update ack_start */
1516 diff = add_buf(bufnr, count);
1517 diff = sub_buf(diff, q->u.in.ack_start);
1518 q->u.in.ack_count -= diff;
1519 if (q->u.in.ack_count <= 0) {
1520 q->u.in.polling = 0;
1521 q->u.in.ack_count = 0;
1522 goto set;
1523 }
1524 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1525 }
1526 else
1527 /* the only ACK will be deleted, so stop polling */
1528 q->u.in.polling = 0;
1529 }
1530
1531 set:
1532 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1533 atomic_add(count, &q->nr_buf_used);
1534
1535 if (need_siga_in(q))
1536 return qdio_siga_input(q);
1537
1538 return 0;
1539 }
1540
1541 /**
1542 * handle_outbound - process filled outbound buffers
1543 * @q: queue containing the buffers
1544 * @callflags: flags
1545 * @bufnr: first buffer to process
1546 * @count: how many buffers are filled
1547 */
1548 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1549 int bufnr, int count)
1550 {
1551 unsigned char state = 0;
1552 int used, rc = 0;
1553
1554 qperf_inc(q, outbound_call);
1555
1556 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1557 used = atomic_add_return(count, &q->nr_buf_used);
1558
1559 if (used == QDIO_MAX_BUFFERS_PER_Q)
1560 qperf_inc(q, outbound_queue_full);
1561
1562 if (callflags & QDIO_FLAG_PCI_OUT) {
1563 q->u.out.pci_out_enabled = 1;
1564 qperf_inc(q, pci_request_int);
1565 } else
1566 q->u.out.pci_out_enabled = 0;
1567
1568 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1569 unsigned long phys_aob = 0;
1570
1571 /* One SIGA-W per buffer required for unicast HSI */
1572 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1573
1574 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1575
1576 rc = qdio_kick_outbound_q(q, phys_aob);
1577 } else if (need_siga_sync(q)) {
1578 rc = qdio_siga_sync_q(q);
1579 } else {
1580 /* try to fast requeue buffers */
1581 get_buf_state(q, prev_buf(bufnr), &state, 0);
1582 if (state != SLSB_CU_OUTPUT_PRIMED)
1583 rc = qdio_kick_outbound_q(q, 0);
1584 else
1585 qperf_inc(q, fast_requeue);
1586 }
1587
1588 /* in case of SIGA errors we must process the error immediately */
1589 if (used >= q->u.out.scan_threshold || rc)
1590 qdio_tasklet_schedule(q);
1591 else
1592 /* free the SBALs in case of no further traffic */
1593 if (!timer_pending(&q->u.out.timer) &&
1594 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1595 mod_timer(&q->u.out.timer, jiffies + HZ);
1596 return rc;
1597 }
1598
1599 /**
1600 * do_QDIO - process input or output buffers
1601 * @cdev: associated ccw_device for the qdio subchannel
1602 * @callflags: input or output and special flags from the program
1603 * @q_nr: queue number
1604 * @bufnr: buffer number
1605 * @count: how many buffers to process
1606 */
1607 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1608 int q_nr, unsigned int bufnr, unsigned int count)
1609 {
1610 struct qdio_irq *irq_ptr;
1611
1612 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1613 return -EINVAL;
1614
1615 irq_ptr = cdev->private->qdio_data;
1616 if (!irq_ptr)
1617 return -ENODEV;
1618
1619 DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1620 "do%02x b:%02x c:%02x", callflags, bufnr, count);
1621
1622 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1623 return -EIO;
1624 if (!count)
1625 return 0;
1626 if (callflags & QDIO_FLAG_SYNC_INPUT)
1627 return handle_inbound(irq_ptr->input_qs[q_nr],
1628 callflags, bufnr, count);
1629 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1630 return handle_outbound(irq_ptr->output_qs[q_nr],
1631 callflags, bufnr, count);
1632 return -EINVAL;
1633 }
1634 EXPORT_SYMBOL_GPL(do_QDIO);
1635
1636 /**
1637 * qdio_start_irq - process input buffers
1638 * @cdev: associated ccw_device for the qdio subchannel
1639 * @nr: input queue number
1640 *
1641 * Return codes
1642 * 0 - success
1643 * 1 - irqs not started since new data is available
1644 */
1645 int qdio_start_irq(struct ccw_device *cdev, int nr)
1646 {
1647 struct qdio_q *q;
1648 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1649
1650 if (!irq_ptr)
1651 return -ENODEV;
1652 q = irq_ptr->input_qs[nr];
1653
1654 clear_nonshared_ind(irq_ptr);
1655 qdio_stop_polling(q);
1656 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1657
1658 /*
1659 * We need to check again to not lose initiative after
1660 * resetting the ACK state.
1661 */
1662 if (test_nonshared_ind(irq_ptr))
1663 goto rescan;
1664 if (!qdio_inbound_q_done(q))
1665 goto rescan;
1666 return 0;
1667
1668 rescan:
1669 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1670 &q->u.in.queue_irq_state))
1671 return 0;
1672 else
1673 return 1;
1674
1675 }
1676 EXPORT_SYMBOL(qdio_start_irq);
1677
1678 /**
1679 * qdio_get_next_buffers - process input buffers
1680 * @cdev: associated ccw_device for the qdio subchannel
1681 * @nr: input queue number
1682 * @bufnr: first filled buffer number
1683 * @error: buffers are in error state
1684 *
1685 * Return codes
1686 * < 0 - error
1687 * = 0 - no new buffers found
1688 * > 0 - number of processed buffers
1689 */
1690 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1691 int *error)
1692 {
1693 struct qdio_q *q;
1694 int start, end;
1695 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1696
1697 if (!irq_ptr)
1698 return -ENODEV;
1699 q = irq_ptr->input_qs[nr];
1700
1701 /*
1702 * Cannot rely on automatic sync after interrupt since queues may
1703 * also be examined without interrupt.
1704 */
1705 if (need_siga_sync(q))
1706 qdio_sync_queues(q);
1707
1708 /* check the PCI capable outbound queues. */
1709 qdio_check_outbound_after_thinint(q);
1710
1711 if (!qdio_inbound_q_moved(q))
1712 return 0;
1713
1714 /* Note: upper-layer MUST stop processing immediately here ... */
1715 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1716 return -EIO;
1717
1718 start = q->first_to_kick;
1719 end = q->first_to_check;
1720 *bufnr = start;
1721 *error = q->qdio_error;
1722
1723 /* for the next time */
1724 q->first_to_kick = end;
1725 q->qdio_error = 0;
1726 return sub_buf(end, start);
1727 }
1728 EXPORT_SYMBOL(qdio_get_next_buffers);
1729
1730 /**
1731 * qdio_stop_irq - disable interrupt processing for the device
1732 * @cdev: associated ccw_device for the qdio subchannel
1733 * @nr: input queue number
1734 *
1735 * Return codes
1736 * 0 - interrupts were already disabled
1737 * 1 - interrupts successfully disabled
1738 */
1739 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1740 {
1741 struct qdio_q *q;
1742 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1743
1744 if (!irq_ptr)
1745 return -ENODEV;
1746 q = irq_ptr->input_qs[nr];
1747
1748 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1749 &q->u.in.queue_irq_state))
1750 return 0;
1751 else
1752 return 1;
1753 }
1754 EXPORT_SYMBOL(qdio_stop_irq);
1755
1756 /**
1757 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1758 * @schid: Subchannel ID.
1759 * @cnc: Boolean Change-Notification Control
1760 * @response: Response code will be stored at this address
1761 * @cb: Callback function will be executed for each element
1762 * of the address list
1763 * @priv: Pointer passed from the caller to qdio_pnso_brinfo()
1764 * @type: Type of the address entry passed to the callback
1765 * @entry: Entry containg the address of the specified type
1766 * @priv: Pointer to pass to the callback function.
1767 *
1768 * Performs "Store-network-bridging-information list" operation and calls
1769 * the callback function for every entry in the list. If "change-
1770 * notification-control" is set, further changes in the address list
1771 * will be reported via the IPA command.
1772 */
1773 int qdio_pnso_brinfo(struct subchannel_id schid,
1774 int cnc, u16 *response,
1775 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1776 void *entry),
1777 void *priv)
1778 {
1779 struct chsc_pnso_area *rr;
1780 int rc;
1781 u32 prev_instance = 0;
1782 int isfirstblock = 1;
1783 int i, size, elems;
1784
1785 rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1786 if (rr == NULL)
1787 return -ENOMEM;
1788 do {
1789 /* on the first iteration, naihdr.resume_token will be zero */
1790 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1791 if (rc != 0 && rc != -EBUSY)
1792 goto out;
1793 if (rr->response.code != 1) {
1794 rc = -EIO;
1795 continue;
1796 } else
1797 rc = 0;
1798
1799 if (cb == NULL)
1800 continue;
1801
1802 size = rr->naihdr.naids;
1803 elems = (rr->response.length -
1804 sizeof(struct chsc_header) -
1805 sizeof(struct chsc_brinfo_naihdr)) /
1806 size;
1807
1808 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1809 /* Inform the caller that they need to scrap */
1810 /* the data that was already reported via cb */
1811 rc = -EAGAIN;
1812 break;
1813 }
1814 isfirstblock = 0;
1815 prev_instance = rr->naihdr.instance;
1816 for (i = 0; i < elems; i++)
1817 switch (size) {
1818 case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1819 (*cb)(priv, l3_ipv6_addr,
1820 &rr->entries.l3_ipv6[i]);
1821 break;
1822 case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1823 (*cb)(priv, l3_ipv4_addr,
1824 &rr->entries.l3_ipv4[i]);
1825 break;
1826 case sizeof(struct qdio_brinfo_entry_l2):
1827 (*cb)(priv, l2_addr_lnid,
1828 &rr->entries.l2[i]);
1829 break;
1830 default:
1831 WARN_ON_ONCE(1);
1832 rc = -EIO;
1833 goto out;
1834 }
1835 } while (rr->response.code == 0x0107 || /* channel busy */
1836 (rr->response.code == 1 && /* list stored */
1837 /* resume token is non-zero => list incomplete */
1838 (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1839 (*response) = rr->response.code;
1840
1841 out:
1842 free_page((unsigned long)rr);
1843 return rc;
1844 }
1845 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1846
1847 static int __init init_QDIO(void)
1848 {
1849 int rc;
1850
1851 rc = qdio_debug_init();
1852 if (rc)
1853 return rc;
1854 rc = qdio_setup_init();
1855 if (rc)
1856 goto out_debug;
1857 rc = tiqdio_allocate_memory();
1858 if (rc)
1859 goto out_cache;
1860 rc = tiqdio_register_thinints();
1861 if (rc)
1862 goto out_ti;
1863 return 0;
1864
1865 out_ti:
1866 tiqdio_free_memory();
1867 out_cache:
1868 qdio_setup_exit();
1869 out_debug:
1870 qdio_debug_exit();
1871 return rc;
1872 }
1873
1874 static void __exit exit_QDIO(void)
1875 {
1876 tiqdio_unregister_thinints();
1877 tiqdio_free_memory();
1878 qdio_setup_exit();
1879 qdio_debug_exit();
1880 }
1881
1882 module_init(init_QDIO);
1883 module_exit(exit_QDIO);
Linux with added FPC-III support