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Linux 4.2.1
[linux/fpc-iii.git] / drivers / s390 / cio / qdio_main.c
blob848e3b64ea6e3004d8c2da9f4ed2868ff25305e0
1 /*
2 * Linux for s390 qdio support, buffer handling, qdio API and module support.
3 *
4 * Copyright IBM Corp. 2000, 2008
5 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
6 * Jan Glauber <jang@linux.vnet.ibm.com>
7 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
8 */
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/timer.h>
13 #include <linux/delay.h>
14 #include <linux/gfp.h>
15 #include <linux/io.h>
16 #include <linux/atomic.h>
17 #include <asm/debug.h>
18 #include <asm/qdio.h>
19 #include <asm/ipl.h>
20
21 #include "cio.h"
22 #include "css.h"
23 #include "device.h"
24 #include "qdio.h"
25 #include "qdio_debug.h"
26
27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
28 "Jan Glauber <jang@linux.vnet.ibm.com>");
29 MODULE_DESCRIPTION("QDIO base support");
30 MODULE_LICENSE("GPL");
31
32 static inline int do_siga_sync(unsigned long schid,
33 unsigned int out_mask, unsigned int in_mask,
34 unsigned int fc)
35 {
36 register unsigned long __fc asm ("0") = fc;
37 register unsigned long __schid asm ("1") = schid;
38 register unsigned long out asm ("2") = out_mask;
39 register unsigned long in asm ("3") = in_mask;
40 int cc;
41
42 asm volatile(
43 " siga 0\n"
44 " ipm %0\n"
45 " srl %0,28\n"
46 : "=d" (cc)
47 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
48 return cc;
49 }
50
51 static inline int do_siga_input(unsigned long schid, unsigned int mask,
52 unsigned int fc)
53 {
54 register unsigned long __fc asm ("0") = fc;
55 register unsigned long __schid asm ("1") = schid;
56 register unsigned long __mask asm ("2") = mask;
57 int cc;
58
59 asm volatile(
60 " siga 0\n"
61 " ipm %0\n"
62 " srl %0,28\n"
63 : "=d" (cc)
64 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
65 return cc;
66 }
67
68 /**
69 * do_siga_output - perform SIGA-w/wt function
70 * @schid: subchannel id or in case of QEBSM the subchannel token
71 * @mask: which output queues to process
72 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
73 * @fc: function code to perform
74 *
75 * Returns condition code.
76 * Note: For IQDC unicast queues only the highest priority queue is processed.
77 */
78 static inline int do_siga_output(unsigned long schid, unsigned long mask,
79 unsigned int *bb, unsigned int fc,
80 unsigned long aob)
81 {
82 register unsigned long __fc asm("0") = fc;
83 register unsigned long __schid asm("1") = schid;
84 register unsigned long __mask asm("2") = mask;
85 register unsigned long __aob asm("3") = aob;
86 int cc;
87
88 asm volatile(
89 " siga 0\n"
90 " ipm %0\n"
91 " srl %0,28\n"
92 : "=d" (cc), "+d" (__fc), "+d" (__aob)
93 : "d" (__schid), "d" (__mask)
94 : "cc");
95 *bb = __fc >> 31;
96 return cc;
97 }
98
99 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
100 {
101 /* all done or next buffer state different */
102 if (ccq == 0 || ccq == 32)
103 return 0;
104 /* no buffer processed */
105 if (ccq == 97)
106 return 1;
107 /* not all buffers processed */
108 if (ccq == 96)
109 return 2;
110 /* notify devices immediately */
111 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
112 return -EIO;
113 }
114
115 /**
116 * qdio_do_eqbs - extract buffer states for QEBSM
117 * @q: queue to manipulate
118 * @state: state of the extracted buffers
119 * @start: buffer number to start at
120 * @count: count of buffers to examine
121 * @auto_ack: automatically acknowledge buffers
122 *
123 * Returns the number of successfully extracted equal buffer states.
124 * Stops processing if a state is different from the last buffers state.
125 */
126 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
127 int start, int count, int auto_ack)
128 {
129 int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
130 unsigned int ccq = 0;
131
132 qperf_inc(q, eqbs);
133
134 if (!q->is_input_q)
135 nr += q->irq_ptr->nr_input_qs;
136 again:
137 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
138 auto_ack);
139 rc = qdio_check_ccq(q, ccq);
140 if (!rc)
141 return count - tmp_count;
142
143 if (rc == 1) {
144 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
145 goto again;
146 }
147
148 if (rc == 2) {
149 qperf_inc(q, eqbs_partial);
150 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
151 tmp_count);
152 /*
153 * Retry once, if that fails bail out and process the
154 * extracted buffers before trying again.
155 */
156 if (!retried++)
157 goto again;
158 else
159 return count - tmp_count;
160 }
161
162 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
163 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
164 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE,
165 q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
166 return 0;
167 }
168
169 /**
170 * qdio_do_sqbs - set buffer states for QEBSM
171 * @q: queue to manipulate
172 * @state: new state of the buffers
173 * @start: first buffer number to change
174 * @count: how many buffers to change
175 *
176 * Returns the number of successfully changed buffers.
177 * Does retrying until the specified count of buffer states is set or an
178 * error occurs.
179 */
180 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
181 int count)
182 {
183 unsigned int ccq = 0;
184 int tmp_count = count, tmp_start = start;
185 int nr = q->nr;
186 int rc;
187
188 if (!count)
189 return 0;
190 qperf_inc(q, sqbs);
191
192 if (!q->is_input_q)
193 nr += q->irq_ptr->nr_input_qs;
194 again:
195 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
196 rc = qdio_check_ccq(q, ccq);
197 if (!rc) {
198 WARN_ON_ONCE(tmp_count);
199 return count - tmp_count;
200 }
201
202 if (rc == 1 || rc == 2) {
203 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
204 qperf_inc(q, sqbs_partial);
205 goto again;
206 }
207
208 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
209 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
210 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE,
211 q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
212 return 0;
213 }
214
215 /* returns number of examined buffers and their common state in *state */
216 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
217 unsigned char *state, unsigned int count,
218 int auto_ack, int merge_pending)
219 {
220 unsigned char __state = 0;
221 int i;
222
223 if (is_qebsm(q))
224 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
225
226 for (i = 0; i < count; i++) {
227 if (!__state) {
228 __state = q->slsb.val[bufnr];
229 if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
230 __state = SLSB_P_OUTPUT_EMPTY;
231 } else if (merge_pending) {
232 if ((q->slsb.val[bufnr] & __state) != __state)
233 break;
234 } else if (q->slsb.val[bufnr] != __state)
235 break;
236 bufnr = next_buf(bufnr);
237 }
238 *state = __state;
239 return i;
240 }
241
242 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
243 unsigned char *state, int auto_ack)
244 {
245 return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
246 }
247
248 /* wrap-around safe setting of slsb states, returns number of changed buffers */
249 static inline int set_buf_states(struct qdio_q *q, int bufnr,
250 unsigned char state, int count)
251 {
252 int i;
253
254 if (is_qebsm(q))
255 return qdio_do_sqbs(q, state, bufnr, count);
256
257 for (i = 0; i < count; i++) {
258 xchg(&q->slsb.val[bufnr], state);
259 bufnr = next_buf(bufnr);
260 }
261 return count;
262 }
263
264 static inline int set_buf_state(struct qdio_q *q, int bufnr,
265 unsigned char state)
266 {
267 return set_buf_states(q, bufnr, state, 1);
268 }
269
270 /* set slsb states to initial state */
271 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
272 {
273 struct qdio_q *q;
274 int i;
275
276 for_each_input_queue(irq_ptr, q, i)
277 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
278 QDIO_MAX_BUFFERS_PER_Q);
279 for_each_output_queue(irq_ptr, q, i)
280 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
281 QDIO_MAX_BUFFERS_PER_Q);
282 }
283
284 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
285 unsigned int input)
286 {
287 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
288 unsigned int fc = QDIO_SIGA_SYNC;
289 int cc;
290
291 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
292 qperf_inc(q, siga_sync);
293
294 if (is_qebsm(q)) {
295 schid = q->irq_ptr->sch_token;
296 fc |= QDIO_SIGA_QEBSM_FLAG;
297 }
298
299 cc = do_siga_sync(schid, output, input, fc);
300 if (unlikely(cc))
301 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
302 return (cc) ? -EIO : 0;
303 }
304
305 static inline int qdio_siga_sync_q(struct qdio_q *q)
306 {
307 if (q->is_input_q)
308 return qdio_siga_sync(q, 0, q->mask);
309 else
310 return qdio_siga_sync(q, q->mask, 0);
311 }
312
313 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
314 unsigned long aob)
315 {
316 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
317 unsigned int fc = QDIO_SIGA_WRITE;
318 u64 start_time = 0;
319 int retries = 0, cc;
320 unsigned long laob = 0;
321
322 if (q->u.out.use_cq && aob != 0) {
323 fc = QDIO_SIGA_WRITEQ;
324 laob = aob;
325 }
326
327 if (is_qebsm(q)) {
328 schid = q->irq_ptr->sch_token;
329 fc |= QDIO_SIGA_QEBSM_FLAG;
330 }
331 again:
332 WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
333 (aob && fc != QDIO_SIGA_WRITEQ));
334 cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
335
336 /* hipersocket busy condition */
337 if (unlikely(*busy_bit)) {
338 retries++;
339
340 if (!start_time) {
341 start_time = get_tod_clock_fast();
342 goto again;
343 }
344 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
345 goto again;
346 }
347 if (retries) {
348 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
349 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
350 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
351 }
352 return cc;
353 }
354
355 static inline int qdio_siga_input(struct qdio_q *q)
356 {
357 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
358 unsigned int fc = QDIO_SIGA_READ;
359 int cc;
360
361 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
362 qperf_inc(q, siga_read);
363
364 if (is_qebsm(q)) {
365 schid = q->irq_ptr->sch_token;
366 fc |= QDIO_SIGA_QEBSM_FLAG;
367 }
368
369 cc = do_siga_input(schid, q->mask, fc);
370 if (unlikely(cc))
371 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
372 return (cc) ? -EIO : 0;
373 }
374
375 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
376 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
377
378 static inline void qdio_sync_queues(struct qdio_q *q)
379 {
380 /* PCI capable outbound queues will also be scanned so sync them too */
381 if (pci_out_supported(q))
382 qdio_siga_sync_all(q);
383 else
384 qdio_siga_sync_q(q);
385 }
386
387 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
388 unsigned char *state)
389 {
390 if (need_siga_sync(q))
391 qdio_siga_sync_q(q);
392 return get_buf_states(q, bufnr, state, 1, 0, 0);
393 }
394
395 static inline void qdio_stop_polling(struct qdio_q *q)
396 {
397 if (!q->u.in.polling)
398 return;
399
400 q->u.in.polling = 0;
401 qperf_inc(q, stop_polling);
402
403 /* show the card that we are not polling anymore */
404 if (is_qebsm(q)) {
405 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
406 q->u.in.ack_count);
407 q->u.in.ack_count = 0;
408 } else
409 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
410 }
411
412 static inline void account_sbals(struct qdio_q *q, unsigned int count)
413 {
414 int pos;
415
416 q->q_stats.nr_sbal_total += count;
417 if (count == QDIO_MAX_BUFFERS_MASK) {
418 q->q_stats.nr_sbals[7]++;
419 return;
420 }
421 pos = ilog2(count);
422 q->q_stats.nr_sbals[pos]++;
423 }
424
425 static void process_buffer_error(struct qdio_q *q, int count)
426 {
427 unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
428 SLSB_P_OUTPUT_NOT_INIT;
429
430 q->qdio_error = QDIO_ERROR_SLSB_STATE;
431
432 /* special handling for no target buffer empty */
433 if ((!q->is_input_q &&
434 (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
435 qperf_inc(q, target_full);
436 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
437 q->first_to_check);
438 goto set;
439 }
440
441 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
442 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
443 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
444 DBF_ERROR("F14:%2x F15:%2x",
445 q->sbal[q->first_to_check]->element[14].sflags,
446 q->sbal[q->first_to_check]->element[15].sflags);
447
448 set:
449 /*
450 * Interrupts may be avoided as long as the error is present
451 * so change the buffer state immediately to avoid starvation.
452 */
453 set_buf_states(q, q->first_to_check, state, count);
454 }
455
456 static inline void inbound_primed(struct qdio_q *q, int count)
457 {
458 int new;
459
460 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
461
462 /* for QEBSM the ACK was already set by EQBS */
463 if (is_qebsm(q)) {
464 if (!q->u.in.polling) {
465 q->u.in.polling = 1;
466 q->u.in.ack_count = count;
467 q->u.in.ack_start = q->first_to_check;
468 return;
469 }
470
471 /* delete the previous ACK's */
472 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
473 q->u.in.ack_count);
474 q->u.in.ack_count = count;
475 q->u.in.ack_start = q->first_to_check;
476 return;
477 }
478
479 /*
480 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
481 * or by the next inbound run.
482 */
483 new = add_buf(q->first_to_check, count - 1);
484 if (q->u.in.polling) {
485 /* reset the previous ACK but first set the new one */
486 set_buf_state(q, new, SLSB_P_INPUT_ACK);
487 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
488 } else {
489 q->u.in.polling = 1;
490 set_buf_state(q, new, SLSB_P_INPUT_ACK);
491 }
492
493 q->u.in.ack_start = new;
494 count--;
495 if (!count)
496 return;
497 /* need to change ALL buffers to get more interrupts */
498 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
499 }
500
501 static int get_inbound_buffer_frontier(struct qdio_q *q)
502 {
503 int count, stop;
504 unsigned char state = 0;
505
506 q->timestamp = get_tod_clock_fast();
507
508 /*
509 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
510 * would return 0.
511 */
512 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
513 stop = add_buf(q->first_to_check, count);
514
515 if (q->first_to_check == stop)
516 goto out;
517
518 /*
519 * No siga sync here, as a PCI or we after a thin interrupt
520 * already sync'ed the queues.
521 */
522 count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
523 if (!count)
524 goto out;
525
526 switch (state) {
527 case SLSB_P_INPUT_PRIMED:
528 inbound_primed(q, count);
529 q->first_to_check = add_buf(q->first_to_check, count);
530 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
531 qperf_inc(q, inbound_queue_full);
532 if (q->irq_ptr->perf_stat_enabled)
533 account_sbals(q, count);
534 break;
535 case SLSB_P_INPUT_ERROR:
536 process_buffer_error(q, count);
537 q->first_to_check = add_buf(q->first_to_check, count);
538 atomic_sub(count, &q->nr_buf_used);
539 if (q->irq_ptr->perf_stat_enabled)
540 account_sbals_error(q, count);
541 break;
542 case SLSB_CU_INPUT_EMPTY:
543 case SLSB_P_INPUT_NOT_INIT:
544 case SLSB_P_INPUT_ACK:
545 if (q->irq_ptr->perf_stat_enabled)
546 q->q_stats.nr_sbal_nop++;
547 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
548 break;
549 default:
550 WARN_ON_ONCE(1);
551 }
552 out:
553 return q->first_to_check;
554 }
555
556 static int qdio_inbound_q_moved(struct qdio_q *q)
557 {
558 int bufnr;
559
560 bufnr = get_inbound_buffer_frontier(q);
561
562 if (bufnr != q->last_move) {
563 q->last_move = bufnr;
564 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
565 q->u.in.timestamp = get_tod_clock();
566 return 1;
567 } else
568 return 0;
569 }
570
571 static inline int qdio_inbound_q_done(struct qdio_q *q)
572 {
573 unsigned char state = 0;
574
575 if (!atomic_read(&q->nr_buf_used))
576 return 1;
577
578 if (need_siga_sync(q))
579 qdio_siga_sync_q(q);
580 get_buf_state(q, q->first_to_check, &state, 0);
581
582 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
583 /* more work coming */
584 return 0;
585
586 if (is_thinint_irq(q->irq_ptr))
587 return 1;
588
589 /* don't poll under z/VM */
590 if (MACHINE_IS_VM)
591 return 1;
592
593 /*
594 * At this point we know, that inbound first_to_check
595 * has (probably) not moved (see qdio_inbound_processing).
596 */
597 if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
598 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
599 q->first_to_check);
600 return 1;
601 } else
602 return 0;
603 }
604
605 static inline int contains_aobs(struct qdio_q *q)
606 {
607 return !q->is_input_q && q->u.out.use_cq;
608 }
609
610 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
611 {
612 unsigned char state = 0;
613 int j, b = start;
614
615 if (!contains_aobs(q))
616 return;
617
618 for (j = 0; j < count; ++j) {
619 get_buf_state(q, b, &state, 0);
620 if (state == SLSB_P_OUTPUT_PENDING) {
621 struct qaob *aob = q->u.out.aobs[b];
622 if (aob == NULL)
623 continue;
624
625 q->u.out.sbal_state[b].flags |=
626 QDIO_OUTBUF_STATE_FLAG_PENDING;
627 q->u.out.aobs[b] = NULL;
628 } else if (state == SLSB_P_OUTPUT_EMPTY) {
629 q->u.out.sbal_state[b].aob = NULL;
630 }
631 b = next_buf(b);
632 }
633 }
634
635 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
636 int bufnr)
637 {
638 unsigned long phys_aob = 0;
639
640 if (!q->use_cq)
641 goto out;
642
643 if (!q->aobs[bufnr]) {
644 struct qaob *aob = qdio_allocate_aob();
645 q->aobs[bufnr] = aob;
646 }
647 if (q->aobs[bufnr]) {
648 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
649 q->sbal_state[bufnr].aob = q->aobs[bufnr];
650 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
651 phys_aob = virt_to_phys(q->aobs[bufnr]);
652 WARN_ON_ONCE(phys_aob & 0xFF);
653 }
654
655 out:
656 return phys_aob;
657 }
658
659 static void qdio_kick_handler(struct qdio_q *q)
660 {
661 int start = q->first_to_kick;
662 int end = q->first_to_check;
663 int count;
664
665 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
666 return;
667
668 count = sub_buf(end, start);
669
670 if (q->is_input_q) {
671 qperf_inc(q, inbound_handler);
672 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
673 } else {
674 qperf_inc(q, outbound_handler);
675 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
676 start, count);
677 }
678
679 qdio_handle_aobs(q, start, count);
680
681 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
682 q->irq_ptr->int_parm);
683
684 /* for the next time */
685 q->first_to_kick = end;
686 q->qdio_error = 0;
687 }
688
689 static void __qdio_inbound_processing(struct qdio_q *q)
690 {
691 qperf_inc(q, tasklet_inbound);
692
693 if (!qdio_inbound_q_moved(q))
694 return;
695
696 qdio_kick_handler(q);
697
698 if (!qdio_inbound_q_done(q)) {
699 /* means poll time is not yet over */
700 qperf_inc(q, tasklet_inbound_resched);
701 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
702 tasklet_schedule(&q->tasklet);
703 return;
704 }
705 }
706
707 qdio_stop_polling(q);
708 /*
709 * We need to check again to not lose initiative after
710 * resetting the ACK state.
711 */
712 if (!qdio_inbound_q_done(q)) {
713 qperf_inc(q, tasklet_inbound_resched2);
714 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
715 tasklet_schedule(&q->tasklet);
716 }
717 }
718
719 void qdio_inbound_processing(unsigned long data)
720 {
721 struct qdio_q *q = (struct qdio_q *)data;
722 __qdio_inbound_processing(q);
723 }
724
725 static int get_outbound_buffer_frontier(struct qdio_q *q)
726 {
727 int count, stop;
728 unsigned char state = 0;
729
730 q->timestamp = get_tod_clock_fast();
731
732 if (need_siga_sync(q))
733 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
734 !pci_out_supported(q)) ||
735 (queue_type(q) == QDIO_IQDIO_QFMT &&
736 multicast_outbound(q)))
737 qdio_siga_sync_q(q);
738
739 /*
740 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
741 * would return 0.
742 */
743 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
744 stop = add_buf(q->first_to_check, count);
745 if (q->first_to_check == stop)
746 goto out;
747
748 count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
749 if (!count)
750 goto out;
751
752 switch (state) {
753 case SLSB_P_OUTPUT_EMPTY:
754 /* the adapter got it */
755 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
756 "out empty:%1d %02x", q->nr, count);
757
758 atomic_sub(count, &q->nr_buf_used);
759 q->first_to_check = add_buf(q->first_to_check, count);
760 if (q->irq_ptr->perf_stat_enabled)
761 account_sbals(q, count);
762
763 break;
764 case SLSB_P_OUTPUT_ERROR:
765 process_buffer_error(q, count);
766 q->first_to_check = add_buf(q->first_to_check, count);
767 atomic_sub(count, &q->nr_buf_used);
768 if (q->irq_ptr->perf_stat_enabled)
769 account_sbals_error(q, count);
770 break;
771 case SLSB_CU_OUTPUT_PRIMED:
772 /* the adapter has not fetched the output yet */
773 if (q->irq_ptr->perf_stat_enabled)
774 q->q_stats.nr_sbal_nop++;
775 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
776 q->nr);
777 break;
778 case SLSB_P_OUTPUT_NOT_INIT:
779 case SLSB_P_OUTPUT_HALTED:
780 break;
781 default:
782 WARN_ON_ONCE(1);
783 }
784
785 out:
786 return q->first_to_check;
787 }
788
789 /* all buffers processed? */
790 static inline int qdio_outbound_q_done(struct qdio_q *q)
791 {
792 return atomic_read(&q->nr_buf_used) == 0;
793 }
794
795 static inline int qdio_outbound_q_moved(struct qdio_q *q)
796 {
797 int bufnr;
798
799 bufnr = get_outbound_buffer_frontier(q);
800
801 if (bufnr != q->last_move) {
802 q->last_move = bufnr;
803 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
804 return 1;
805 } else
806 return 0;
807 }
808
809 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
810 {
811 int retries = 0, cc;
812 unsigned int busy_bit;
813
814 if (!need_siga_out(q))
815 return 0;
816
817 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
818 retry:
819 qperf_inc(q, siga_write);
820
821 cc = qdio_siga_output(q, &busy_bit, aob);
822 switch (cc) {
823 case 0:
824 break;
825 case 2:
826 if (busy_bit) {
827 while (++retries < QDIO_BUSY_BIT_RETRIES) {
828 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
829 goto retry;
830 }
831 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
832 cc = -EBUSY;
833 } else {
834 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
835 cc = -ENOBUFS;
836 }
837 break;
838 case 1:
839 case 3:
840 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
841 cc = -EIO;
842 break;
843 }
844 if (retries) {
845 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
846 DBF_ERROR("count:%u", retries);
847 }
848 return cc;
849 }
850
851 static void __qdio_outbound_processing(struct qdio_q *q)
852 {
853 qperf_inc(q, tasklet_outbound);
854 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
855
856 if (qdio_outbound_q_moved(q))
857 qdio_kick_handler(q);
858
859 if (queue_type(q) == QDIO_ZFCP_QFMT)
860 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
861 goto sched;
862
863 if (q->u.out.pci_out_enabled)
864 return;
865
866 /*
867 * Now we know that queue type is either qeth without pci enabled
868 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
869 * is noticed and outbound_handler is called after some time.
870 */
871 if (qdio_outbound_q_done(q))
872 del_timer(&q->u.out.timer);
873 else
874 if (!timer_pending(&q->u.out.timer))
875 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
876 return;
877
878 sched:
879 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
880 return;
881 tasklet_schedule(&q->tasklet);
882 }
883
884 /* outbound tasklet */
885 void qdio_outbound_processing(unsigned long data)
886 {
887 struct qdio_q *q = (struct qdio_q *)data;
888 __qdio_outbound_processing(q);
889 }
890
891 void qdio_outbound_timer(unsigned long data)
892 {
893 struct qdio_q *q = (struct qdio_q *)data;
894
895 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
896 return;
897 tasklet_schedule(&q->tasklet);
898 }
899
900 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
901 {
902 struct qdio_q *out;
903 int i;
904
905 if (!pci_out_supported(q))
906 return;
907
908 for_each_output_queue(q->irq_ptr, out, i)
909 if (!qdio_outbound_q_done(out))
910 tasklet_schedule(&out->tasklet);
911 }
912
913 static void __tiqdio_inbound_processing(struct qdio_q *q)
914 {
915 qperf_inc(q, tasklet_inbound);
916 if (need_siga_sync(q) && need_siga_sync_after_ai(q))
917 qdio_sync_queues(q);
918
919 /*
920 * The interrupt could be caused by a PCI request. Check the
921 * PCI capable outbound queues.
922 */
923 qdio_check_outbound_after_thinint(q);
924
925 if (!qdio_inbound_q_moved(q))
926 return;
927
928 qdio_kick_handler(q);
929
930 if (!qdio_inbound_q_done(q)) {
931 qperf_inc(q, tasklet_inbound_resched);
932 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
933 tasklet_schedule(&q->tasklet);
934 return;
935 }
936 }
937
938 qdio_stop_polling(q);
939 /*
940 * We need to check again to not lose initiative after
941 * resetting the ACK state.
942 */
943 if (!qdio_inbound_q_done(q)) {
944 qperf_inc(q, tasklet_inbound_resched2);
945 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
946 tasklet_schedule(&q->tasklet);
947 }
948 }
949
950 void tiqdio_inbound_processing(unsigned long data)
951 {
952 struct qdio_q *q = (struct qdio_q *)data;
953 __tiqdio_inbound_processing(q);
954 }
955
956 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
957 enum qdio_irq_states state)
958 {
959 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
960
961 irq_ptr->state = state;
962 mb();
963 }
964
965 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
966 {
967 if (irb->esw.esw0.erw.cons) {
968 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
969 DBF_ERROR_HEX(irb, 64);
970 DBF_ERROR_HEX(irb->ecw, 64);
971 }
972 }
973
974 /* PCI interrupt handler */
975 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
976 {
977 int i;
978 struct qdio_q *q;
979
980 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
981 return;
982
983 for_each_input_queue(irq_ptr, q, i) {
984 if (q->u.in.queue_start_poll) {
985 /* skip if polling is enabled or already in work */
986 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
987 &q->u.in.queue_irq_state)) {
988 qperf_inc(q, int_discarded);
989 continue;
990 }
991 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
992 q->irq_ptr->int_parm);
993 } else {
994 tasklet_schedule(&q->tasklet);
995 }
996 }
997
998 if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
999 return;
1000
1001 for_each_output_queue(irq_ptr, q, i) {
1002 if (qdio_outbound_q_done(q))
1003 continue;
1004 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1005 qdio_siga_sync_q(q);
1006 tasklet_schedule(&q->tasklet);
1007 }
1008 }
1009
1010 static void qdio_handle_activate_check(struct ccw_device *cdev,
1011 unsigned long intparm, int cstat, int dstat)
1012 {
1013 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1014 struct qdio_q *q;
1015 int count;
1016
1017 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1018 DBF_ERROR("intp :%lx", intparm);
1019 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1020
1021 if (irq_ptr->nr_input_qs) {
1022 q = irq_ptr->input_qs[0];
1023 } else if (irq_ptr->nr_output_qs) {
1024 q = irq_ptr->output_qs[0];
1025 } else {
1026 dump_stack();
1027 goto no_handler;
1028 }
1029
1030 count = sub_buf(q->first_to_check, q->first_to_kick);
1031 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1032 q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1033 no_handler:
1034 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1035 /*
1036 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1037 * Therefore we call the LGR detection function here.
1038 */
1039 lgr_info_log();
1040 }
1041
1042 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1043 int dstat)
1044 {
1045 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1046
1047 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1048
1049 if (cstat)
1050 goto error;
1051 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1052 goto error;
1053 if (!(dstat & DEV_STAT_DEV_END))
1054 goto error;
1055 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1056 return;
1057
1058 error:
1059 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1060 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1061 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1062 }
1063
1064 /* qdio interrupt handler */
1065 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1066 struct irb *irb)
1067 {
1068 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1069 int cstat, dstat;
1070
1071 if (!intparm || !irq_ptr) {
1072 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1073 return;
1074 }
1075
1076 if (irq_ptr->perf_stat_enabled)
1077 irq_ptr->perf_stat.qdio_int++;
1078
1079 if (IS_ERR(irb)) {
1080 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1081 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1082 wake_up(&cdev->private->wait_q);
1083 return;
1084 }
1085 qdio_irq_check_sense(irq_ptr, irb);
1086 cstat = irb->scsw.cmd.cstat;
1087 dstat = irb->scsw.cmd.dstat;
1088
1089 switch (irq_ptr->state) {
1090 case QDIO_IRQ_STATE_INACTIVE:
1091 qdio_establish_handle_irq(cdev, cstat, dstat);
1092 break;
1093 case QDIO_IRQ_STATE_CLEANUP:
1094 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1095 break;
1096 case QDIO_IRQ_STATE_ESTABLISHED:
1097 case QDIO_IRQ_STATE_ACTIVE:
1098 if (cstat & SCHN_STAT_PCI) {
1099 qdio_int_handler_pci(irq_ptr);
1100 return;
1101 }
1102 if (cstat || dstat)
1103 qdio_handle_activate_check(cdev, intparm, cstat,
1104 dstat);
1105 break;
1106 case QDIO_IRQ_STATE_STOPPED:
1107 break;
1108 default:
1109 WARN_ON_ONCE(1);
1110 }
1111 wake_up(&cdev->private->wait_q);
1112 }
1113
1114 /**
1115 * qdio_get_ssqd_desc - get qdio subchannel description
1116 * @cdev: ccw device to get description for
1117 * @data: where to store the ssqd
1118 *
1119 * Returns 0 or an error code. The results of the chsc are stored in the
1120 * specified structure.
1121 */
1122 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1123 struct qdio_ssqd_desc *data)
1124 {
1125
1126 if (!cdev || !cdev->private)
1127 return -EINVAL;
1128
1129 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1130 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1131 }
1132 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1133
1134 static void qdio_shutdown_queues(struct ccw_device *cdev)
1135 {
1136 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1137 struct qdio_q *q;
1138 int i;
1139
1140 for_each_input_queue(irq_ptr, q, i)
1141 tasklet_kill(&q->tasklet);
1142
1143 for_each_output_queue(irq_ptr, q, i) {
1144 del_timer(&q->u.out.timer);
1145 tasklet_kill(&q->tasklet);
1146 }
1147 }
1148
1149 /**
1150 * qdio_shutdown - shut down a qdio subchannel
1151 * @cdev: associated ccw device
1152 * @how: use halt or clear to shutdown
1153 */
1154 int qdio_shutdown(struct ccw_device *cdev, int how)
1155 {
1156 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1157 int rc;
1158 unsigned long flags;
1159
1160 if (!irq_ptr)
1161 return -ENODEV;
1162
1163 WARN_ON_ONCE(irqs_disabled());
1164 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1165
1166 mutex_lock(&irq_ptr->setup_mutex);
1167 /*
1168 * Subchannel was already shot down. We cannot prevent being called
1169 * twice since cio may trigger a shutdown asynchronously.
1170 */
1171 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1172 mutex_unlock(&irq_ptr->setup_mutex);
1173 return 0;
1174 }
1175
1176 /*
1177 * Indicate that the device is going down. Scheduling the queue
1178 * tasklets is forbidden from here on.
1179 */
1180 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1181
1182 tiqdio_remove_input_queues(irq_ptr);
1183 qdio_shutdown_queues(cdev);
1184 qdio_shutdown_debug_entries(irq_ptr);
1185
1186 /* cleanup subchannel */
1187 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1188
1189 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1190 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1191 else
1192 /* default behaviour is halt */
1193 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1194 if (rc) {
1195 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1196 DBF_ERROR("rc:%4d", rc);
1197 goto no_cleanup;
1198 }
1199
1200 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1201 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1202 wait_event_interruptible_timeout(cdev->private->wait_q,
1203 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1204 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1205 10 * HZ);
1206 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1207
1208 no_cleanup:
1209 qdio_shutdown_thinint(irq_ptr);
1210
1211 /* restore interrupt handler */
1212 if ((void *)cdev->handler == (void *)qdio_int_handler)
1213 cdev->handler = irq_ptr->orig_handler;
1214 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1215
1216 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1217 mutex_unlock(&irq_ptr->setup_mutex);
1218 if (rc)
1219 return rc;
1220 return 0;
1221 }
1222 EXPORT_SYMBOL_GPL(qdio_shutdown);
1223
1224 /**
1225 * qdio_free - free data structures for a qdio subchannel
1226 * @cdev: associated ccw device
1227 */
1228 int qdio_free(struct ccw_device *cdev)
1229 {
1230 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1231
1232 if (!irq_ptr)
1233 return -ENODEV;
1234
1235 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1236 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1237 mutex_lock(&irq_ptr->setup_mutex);
1238
1239 irq_ptr->debug_area = NULL;
1240 cdev->private->qdio_data = NULL;
1241 mutex_unlock(&irq_ptr->setup_mutex);
1242
1243 qdio_release_memory(irq_ptr);
1244 return 0;
1245 }
1246 EXPORT_SYMBOL_GPL(qdio_free);
1247
1248 /**
1249 * qdio_allocate - allocate qdio queues and associated data
1250 * @init_data: initialization data
1251 */
1252 int qdio_allocate(struct qdio_initialize *init_data)
1253 {
1254 struct qdio_irq *irq_ptr;
1255
1256 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1257
1258 if ((init_data->no_input_qs && !init_data->input_handler) ||
1259 (init_data->no_output_qs && !init_data->output_handler))
1260 return -EINVAL;
1261
1262 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1263 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1264 return -EINVAL;
1265
1266 if ((!init_data->input_sbal_addr_array) ||
1267 (!init_data->output_sbal_addr_array))
1268 return -EINVAL;
1269
1270 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1271 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1272 if (!irq_ptr)
1273 goto out_err;
1274
1275 mutex_init(&irq_ptr->setup_mutex);
1276 if (qdio_allocate_dbf(init_data, irq_ptr))
1277 goto out_rel;
1278
1279 /*
1280 * Allocate a page for the chsc calls in qdio_establish.
1281 * Must be pre-allocated since a zfcp recovery will call
1282 * qdio_establish. In case of low memory and swap on a zfcp disk
1283 * we may not be able to allocate memory otherwise.
1284 */
1285 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1286 if (!irq_ptr->chsc_page)
1287 goto out_rel;
1288
1289 /* qdr is used in ccw1.cda which is u32 */
1290 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1291 if (!irq_ptr->qdr)
1292 goto out_rel;
1293
1294 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1295 init_data->no_output_qs))
1296 goto out_rel;
1297
1298 init_data->cdev->private->qdio_data = irq_ptr;
1299 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1300 return 0;
1301 out_rel:
1302 qdio_release_memory(irq_ptr);
1303 out_err:
1304 return -ENOMEM;
1305 }
1306 EXPORT_SYMBOL_GPL(qdio_allocate);
1307
1308 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1309 {
1310 struct qdio_q *q = irq_ptr->input_qs[0];
1311 int i, use_cq = 0;
1312
1313 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1314 use_cq = 1;
1315
1316 for_each_output_queue(irq_ptr, q, i) {
1317 if (use_cq) {
1318 if (qdio_enable_async_operation(&q->u.out) < 0) {
1319 use_cq = 0;
1320 continue;
1321 }
1322 } else
1323 qdio_disable_async_operation(&q->u.out);
1324 }
1325 DBF_EVENT("use_cq:%d", use_cq);
1326 }
1327
1328 /**
1329 * qdio_establish - establish queues on a qdio subchannel
1330 * @init_data: initialization data
1331 */
1332 int qdio_establish(struct qdio_initialize *init_data)
1333 {
1334 struct qdio_irq *irq_ptr;
1335 struct ccw_device *cdev = init_data->cdev;
1336 unsigned long saveflags;
1337 int rc;
1338
1339 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1340
1341 irq_ptr = cdev->private->qdio_data;
1342 if (!irq_ptr)
1343 return -ENODEV;
1344
1345 if (cdev->private->state != DEV_STATE_ONLINE)
1346 return -EINVAL;
1347
1348 mutex_lock(&irq_ptr->setup_mutex);
1349 qdio_setup_irq(init_data);
1350
1351 rc = qdio_establish_thinint(irq_ptr);
1352 if (rc) {
1353 mutex_unlock(&irq_ptr->setup_mutex);
1354 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1355 return rc;
1356 }
1357
1358 /* establish q */
1359 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1360 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1361 irq_ptr->ccw.count = irq_ptr->equeue.count;
1362 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1363
1364 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1365 ccw_device_set_options_mask(cdev, 0);
1366
1367 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1368 if (rc) {
1369 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1370 DBF_ERROR("rc:%4x", rc);
1371 }
1372 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1373
1374 if (rc) {
1375 mutex_unlock(&irq_ptr->setup_mutex);
1376 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1377 return rc;
1378 }
1379
1380 wait_event_interruptible_timeout(cdev->private->wait_q,
1381 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1382 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1383
1384 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1385 mutex_unlock(&irq_ptr->setup_mutex);
1386 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1387 return -EIO;
1388 }
1389
1390 qdio_setup_ssqd_info(irq_ptr);
1391
1392 qdio_detect_hsicq(irq_ptr);
1393
1394 /* qebsm is now setup if available, initialize buffer states */
1395 qdio_init_buf_states(irq_ptr);
1396
1397 mutex_unlock(&irq_ptr->setup_mutex);
1398 qdio_print_subchannel_info(irq_ptr, cdev);
1399 qdio_setup_debug_entries(irq_ptr, cdev);
1400 return 0;
1401 }
1402 EXPORT_SYMBOL_GPL(qdio_establish);
1403
1404 /**
1405 * qdio_activate - activate queues on a qdio subchannel
1406 * @cdev: associated cdev
1407 */
1408 int qdio_activate(struct ccw_device *cdev)
1409 {
1410 struct qdio_irq *irq_ptr;
1411 int rc;
1412 unsigned long saveflags;
1413
1414 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1415
1416 irq_ptr = cdev->private->qdio_data;
1417 if (!irq_ptr)
1418 return -ENODEV;
1419
1420 if (cdev->private->state != DEV_STATE_ONLINE)
1421 return -EINVAL;
1422
1423 mutex_lock(&irq_ptr->setup_mutex);
1424 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1425 rc = -EBUSY;
1426 goto out;
1427 }
1428
1429 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1430 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1431 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1432 irq_ptr->ccw.cda = 0;
1433
1434 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1435 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1436
1437 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1438 0, DOIO_DENY_PREFETCH);
1439 if (rc) {
1440 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1441 DBF_ERROR("rc:%4x", rc);
1442 }
1443 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1444
1445 if (rc)
1446 goto out;
1447
1448 if (is_thinint_irq(irq_ptr))
1449 tiqdio_add_input_queues(irq_ptr);
1450
1451 /* wait for subchannel to become active */
1452 msleep(5);
1453
1454 switch (irq_ptr->state) {
1455 case QDIO_IRQ_STATE_STOPPED:
1456 case QDIO_IRQ_STATE_ERR:
1457 rc = -EIO;
1458 break;
1459 default:
1460 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1461 rc = 0;
1462 }
1463 out:
1464 mutex_unlock(&irq_ptr->setup_mutex);
1465 return rc;
1466 }
1467 EXPORT_SYMBOL_GPL(qdio_activate);
1468
1469 static inline int buf_in_between(int bufnr, int start, int count)
1470 {
1471 int end = add_buf(start, count);
1472
1473 if (end > start) {
1474 if (bufnr >= start && bufnr < end)
1475 return 1;
1476 else
1477 return 0;
1478 }
1479
1480 /* wrap-around case */
1481 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1482 (bufnr < end))
1483 return 1;
1484 else
1485 return 0;
1486 }
1487
1488 /**
1489 * handle_inbound - reset processed input buffers
1490 * @q: queue containing the buffers
1491 * @callflags: flags
1492 * @bufnr: first buffer to process
1493 * @count: how many buffers are emptied
1494 */
1495 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1496 int bufnr, int count)
1497 {
1498 int diff;
1499
1500 qperf_inc(q, inbound_call);
1501
1502 if (!q->u.in.polling)
1503 goto set;
1504
1505 /* protect against stop polling setting an ACK for an emptied slsb */
1506 if (count == QDIO_MAX_BUFFERS_PER_Q) {
1507 /* overwriting everything, just delete polling status */
1508 q->u.in.polling = 0;
1509 q->u.in.ack_count = 0;
1510 goto set;
1511 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1512 if (is_qebsm(q)) {
1513 /* partial overwrite, just update ack_start */
1514 diff = add_buf(bufnr, count);
1515 diff = sub_buf(diff, q->u.in.ack_start);
1516 q->u.in.ack_count -= diff;
1517 if (q->u.in.ack_count <= 0) {
1518 q->u.in.polling = 0;
1519 q->u.in.ack_count = 0;
1520 goto set;
1521 }
1522 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1523 }
1524 else
1525 /* the only ACK will be deleted, so stop polling */
1526 q->u.in.polling = 0;
1527 }
1528
1529 set:
1530 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1531 atomic_add(count, &q->nr_buf_used);
1532
1533 if (need_siga_in(q))
1534 return qdio_siga_input(q);
1535
1536 return 0;
1537 }
1538
1539 /**
1540 * handle_outbound - process filled outbound buffers
1541 * @q: queue containing the buffers
1542 * @callflags: flags
1543 * @bufnr: first buffer to process
1544 * @count: how many buffers are filled
1545 */
1546 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1547 int bufnr, int count)
1548 {
1549 unsigned char state = 0;
1550 int used, rc = 0;
1551
1552 qperf_inc(q, outbound_call);
1553
1554 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1555 used = atomic_add_return(count, &q->nr_buf_used);
1556
1557 if (used == QDIO_MAX_BUFFERS_PER_Q)
1558 qperf_inc(q, outbound_queue_full);
1559
1560 if (callflags & QDIO_FLAG_PCI_OUT) {
1561 q->u.out.pci_out_enabled = 1;
1562 qperf_inc(q, pci_request_int);
1563 } else
1564 q->u.out.pci_out_enabled = 0;
1565
1566 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1567 unsigned long phys_aob = 0;
1568
1569 /* One SIGA-W per buffer required for unicast HSI */
1570 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1571
1572 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1573
1574 rc = qdio_kick_outbound_q(q, phys_aob);
1575 } else if (need_siga_sync(q)) {
1576 rc = qdio_siga_sync_q(q);
1577 } else {
1578 /* try to fast requeue buffers */
1579 get_buf_state(q, prev_buf(bufnr), &state, 0);
1580 if (state != SLSB_CU_OUTPUT_PRIMED)
1581 rc = qdio_kick_outbound_q(q, 0);
1582 else
1583 qperf_inc(q, fast_requeue);
1584 }
1585
1586 /* in case of SIGA errors we must process the error immediately */
1587 if (used >= q->u.out.scan_threshold || rc)
1588 tasklet_schedule(&q->tasklet);
1589 else
1590 /* free the SBALs in case of no further traffic */
1591 if (!timer_pending(&q->u.out.timer))
1592 mod_timer(&q->u.out.timer, jiffies + HZ);
1593 return rc;
1594 }
1595
1596 /**
1597 * do_QDIO - process input or output buffers
1598 * @cdev: associated ccw_device for the qdio subchannel
1599 * @callflags: input or output and special flags from the program
1600 * @q_nr: queue number
1601 * @bufnr: buffer number
1602 * @count: how many buffers to process
1603 */
1604 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1605 int q_nr, unsigned int bufnr, unsigned int count)
1606 {
1607 struct qdio_irq *irq_ptr;
1608
1609 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1610 return -EINVAL;
1611
1612 irq_ptr = cdev->private->qdio_data;
1613 if (!irq_ptr)
1614 return -ENODEV;
1615
1616 DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1617 "do%02x b:%02x c:%02x", callflags, bufnr, count);
1618
1619 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1620 return -EIO;
1621 if (!count)
1622 return 0;
1623 if (callflags & QDIO_FLAG_SYNC_INPUT)
1624 return handle_inbound(irq_ptr->input_qs[q_nr],
1625 callflags, bufnr, count);
1626 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1627 return handle_outbound(irq_ptr->output_qs[q_nr],
1628 callflags, bufnr, count);
1629 return -EINVAL;
1630 }
1631 EXPORT_SYMBOL_GPL(do_QDIO);
1632
1633 /**
1634 * qdio_start_irq - process input buffers
1635 * @cdev: associated ccw_device for the qdio subchannel
1636 * @nr: input queue number
1637 *
1638 * Return codes
1639 * 0 - success
1640 * 1 - irqs not started since new data is available
1641 */
1642 int qdio_start_irq(struct ccw_device *cdev, int nr)
1643 {
1644 struct qdio_q *q;
1645 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1646
1647 if (!irq_ptr)
1648 return -ENODEV;
1649 q = irq_ptr->input_qs[nr];
1650
1651 clear_nonshared_ind(irq_ptr);
1652 qdio_stop_polling(q);
1653 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1654
1655 /*
1656 * We need to check again to not lose initiative after
1657 * resetting the ACK state.
1658 */
1659 if (test_nonshared_ind(irq_ptr))
1660 goto rescan;
1661 if (!qdio_inbound_q_done(q))
1662 goto rescan;
1663 return 0;
1664
1665 rescan:
1666 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1667 &q->u.in.queue_irq_state))
1668 return 0;
1669 else
1670 return 1;
1671
1672 }
1673 EXPORT_SYMBOL(qdio_start_irq);
1674
1675 /**
1676 * qdio_get_next_buffers - process input buffers
1677 * @cdev: associated ccw_device for the qdio subchannel
1678 * @nr: input queue number
1679 * @bufnr: first filled buffer number
1680 * @error: buffers are in error state
1681 *
1682 * Return codes
1683 * < 0 - error
1684 * = 0 - no new buffers found
1685 * > 0 - number of processed buffers
1686 */
1687 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1688 int *error)
1689 {
1690 struct qdio_q *q;
1691 int start, end;
1692 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1693
1694 if (!irq_ptr)
1695 return -ENODEV;
1696 q = irq_ptr->input_qs[nr];
1697
1698 /*
1699 * Cannot rely on automatic sync after interrupt since queues may
1700 * also be examined without interrupt.
1701 */
1702 if (need_siga_sync(q))
1703 qdio_sync_queues(q);
1704
1705 /* check the PCI capable outbound queues. */
1706 qdio_check_outbound_after_thinint(q);
1707
1708 if (!qdio_inbound_q_moved(q))
1709 return 0;
1710
1711 /* Note: upper-layer MUST stop processing immediately here ... */
1712 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1713 return -EIO;
1714
1715 start = q->first_to_kick;
1716 end = q->first_to_check;
1717 *bufnr = start;
1718 *error = q->qdio_error;
1719
1720 /* for the next time */
1721 q->first_to_kick = end;
1722 q->qdio_error = 0;
1723 return sub_buf(end, start);
1724 }
1725 EXPORT_SYMBOL(qdio_get_next_buffers);
1726
1727 /**
1728 * qdio_stop_irq - disable interrupt processing for the device
1729 * @cdev: associated ccw_device for the qdio subchannel
1730 * @nr: input queue number
1731 *
1732 * Return codes
1733 * 0 - interrupts were already disabled
1734 * 1 - interrupts successfully disabled
1735 */
1736 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1737 {
1738 struct qdio_q *q;
1739 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1740
1741 if (!irq_ptr)
1742 return -ENODEV;
1743 q = irq_ptr->input_qs[nr];
1744
1745 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1746 &q->u.in.queue_irq_state))
1747 return 0;
1748 else
1749 return 1;
1750 }
1751 EXPORT_SYMBOL(qdio_stop_irq);
1752
1753 /**
1754 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1755 * @schid: Subchannel ID.
1756 * @cnc: Boolean Change-Notification Control
1757 * @response: Response code will be stored at this address
1758 * @cb: Callback function will be executed for each element
1759 * of the address list
1760 * @priv: Pointer passed from the caller to qdio_pnso_brinfo()
1761 * @type: Type of the address entry passed to the callback
1762 * @entry: Entry containg the address of the specified type
1763 * @priv: Pointer to pass to the callback function.
1764 *
1765 * Performs "Store-network-bridging-information list" operation and calls
1766 * the callback function for every entry in the list. If "change-
1767 * notification-control" is set, further changes in the address list
1768 * will be reported via the IPA command.
1769 */
1770 int qdio_pnso_brinfo(struct subchannel_id schid,
1771 int cnc, u16 *response,
1772 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1773 void *entry),
1774 void *priv)
1775 {
1776 struct chsc_pnso_area *rr;
1777 int rc;
1778 u32 prev_instance = 0;
1779 int isfirstblock = 1;
1780 int i, size, elems;
1781
1782 rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1783 if (rr == NULL)
1784 return -ENOMEM;
1785 do {
1786 /* on the first iteration, naihdr.resume_token will be zero */
1787 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1788 if (rc != 0 && rc != -EBUSY)
1789 goto out;
1790 if (rr->response.code != 1) {
1791 rc = -EIO;
1792 continue;
1793 } else
1794 rc = 0;
1795
1796 if (cb == NULL)
1797 continue;
1798
1799 size = rr->naihdr.naids;
1800 elems = (rr->response.length -
1801 sizeof(struct chsc_header) -
1802 sizeof(struct chsc_brinfo_naihdr)) /
1803 size;
1804
1805 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1806 /* Inform the caller that they need to scrap */
1807 /* the data that was already reported via cb */
1808 rc = -EAGAIN;
1809 break;
1810 }
1811 isfirstblock = 0;
1812 prev_instance = rr->naihdr.instance;
1813 for (i = 0; i < elems; i++)
1814 switch (size) {
1815 case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1816 (*cb)(priv, l3_ipv6_addr,
1817 &rr->entries.l3_ipv6[i]);
1818 break;
1819 case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1820 (*cb)(priv, l3_ipv4_addr,
1821 &rr->entries.l3_ipv4[i]);
1822 break;
1823 case sizeof(struct qdio_brinfo_entry_l2):
1824 (*cb)(priv, l2_addr_lnid,
1825 &rr->entries.l2[i]);
1826 break;
1827 default:
1828 WARN_ON_ONCE(1);
1829 rc = -EIO;
1830 goto out;
1831 }
1832 } while (rr->response.code == 0x0107 || /* channel busy */
1833 (rr->response.code == 1 && /* list stored */
1834 /* resume token is non-zero => list incomplete */
1835 (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1836 (*response) = rr->response.code;
1837
1838 out:
1839 free_page((unsigned long)rr);
1840 return rc;
1841 }
1842 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1843
1844 static int __init init_QDIO(void)
1845 {
1846 int rc;
1847
1848 rc = qdio_debug_init();
1849 if (rc)
1850 return rc;
1851 rc = qdio_setup_init();
1852 if (rc)
1853 goto out_debug;
1854 rc = tiqdio_allocate_memory();
1855 if (rc)
1856 goto out_cache;
1857 rc = tiqdio_register_thinints();
1858 if (rc)
1859 goto out_ti;
1860 return 0;
1861
1862 out_ti:
1863 tiqdio_free_memory();
1864 out_cache:
1865 qdio_setup_exit();
1866 out_debug:
1867 qdio_debug_exit();
1868 return rc;
1869 }
1870
1871 static void __exit exit_QDIO(void)
1872 {
1873 tiqdio_unregister_thinints();
1874 tiqdio_free_memory();
1875 qdio_setup_exit();
1876 qdio_debug_exit();
1877 }
1878
1879 module_init(init_QDIO);
1880 module_exit(exit_QDIO);
Linux with added FPC-III support