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Merge branch 'pci/resource' into next
[deliverable/linux.git] / drivers / s390 / cio / qdio_main.c
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, int count)
413 {
414 int pos = 0;
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 while (count >>= 1)
422 pos++;
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: %02x", 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");
549 break;
550 default:
551 WARN_ON_ONCE(1);
552 }
553 out:
554 return q->first_to_check;
555 }
556
557 static int qdio_inbound_q_moved(struct qdio_q *q)
558 {
559 int bufnr;
560
561 bufnr = get_inbound_buffer_frontier(q);
562
563 if (bufnr != q->last_move) {
564 q->last_move = bufnr;
565 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
566 q->u.in.timestamp = get_tod_clock();
567 return 1;
568 } else
569 return 0;
570 }
571
572 static inline int qdio_inbound_q_done(struct qdio_q *q)
573 {
574 unsigned char state = 0;
575
576 if (!atomic_read(&q->nr_buf_used))
577 return 1;
578
579 if (need_siga_sync(q))
580 qdio_siga_sync_q(q);
581 get_buf_state(q, q->first_to_check, &state, 0);
582
583 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
584 /* more work coming */
585 return 0;
586
587 if (is_thinint_irq(q->irq_ptr))
588 return 1;
589
590 /* don't poll under z/VM */
591 if (MACHINE_IS_VM)
592 return 1;
593
594 /*
595 * At this point we know, that inbound first_to_check
596 * has (probably) not moved (see qdio_inbound_processing).
597 */
598 if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
599 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
600 q->first_to_check);
601 return 1;
602 } else
603 return 0;
604 }
605
606 static inline int contains_aobs(struct qdio_q *q)
607 {
608 return !q->is_input_q && q->u.out.use_cq;
609 }
610
611 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
612 {
613 unsigned char state = 0;
614 int j, b = start;
615
616 if (!contains_aobs(q))
617 return;
618
619 for (j = 0; j < count; ++j) {
620 get_buf_state(q, b, &state, 0);
621 if (state == SLSB_P_OUTPUT_PENDING) {
622 struct qaob *aob = q->u.out.aobs[b];
623 if (aob == NULL)
624 continue;
625
626 q->u.out.sbal_state[b].flags |=
627 QDIO_OUTBUF_STATE_FLAG_PENDING;
628 q->u.out.aobs[b] = NULL;
629 } else if (state == SLSB_P_OUTPUT_EMPTY) {
630 q->u.out.sbal_state[b].aob = NULL;
631 }
632 b = next_buf(b);
633 }
634 }
635
636 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
637 int bufnr)
638 {
639 unsigned long phys_aob = 0;
640
641 if (!q->use_cq)
642 goto out;
643
644 if (!q->aobs[bufnr]) {
645 struct qaob *aob = qdio_allocate_aob();
646 q->aobs[bufnr] = aob;
647 }
648 if (q->aobs[bufnr]) {
649 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
650 q->sbal_state[bufnr].aob = q->aobs[bufnr];
651 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
652 phys_aob = virt_to_phys(q->aobs[bufnr]);
653 WARN_ON_ONCE(phys_aob & 0xFF);
654 }
655
656 out:
657 return phys_aob;
658 }
659
660 static void qdio_kick_handler(struct qdio_q *q)
661 {
662 int start = q->first_to_kick;
663 int end = q->first_to_check;
664 int count;
665
666 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
667 return;
668
669 count = sub_buf(end, start);
670
671 if (q->is_input_q) {
672 qperf_inc(q, inbound_handler);
673 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
674 } else {
675 qperf_inc(q, outbound_handler);
676 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
677 start, count);
678 }
679
680 qdio_handle_aobs(q, start, count);
681
682 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
683 q->irq_ptr->int_parm);
684
685 /* for the next time */
686 q->first_to_kick = end;
687 q->qdio_error = 0;
688 }
689
690 static void __qdio_inbound_processing(struct qdio_q *q)
691 {
692 qperf_inc(q, tasklet_inbound);
693
694 if (!qdio_inbound_q_moved(q))
695 return;
696
697 qdio_kick_handler(q);
698
699 if (!qdio_inbound_q_done(q)) {
700 /* means poll time is not yet over */
701 qperf_inc(q, tasklet_inbound_resched);
702 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
703 tasklet_schedule(&q->tasklet);
704 return;
705 }
706 }
707
708 qdio_stop_polling(q);
709 /*
710 * We need to check again to not lose initiative after
711 * resetting the ACK state.
712 */
713 if (!qdio_inbound_q_done(q)) {
714 qperf_inc(q, tasklet_inbound_resched2);
715 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
716 tasklet_schedule(&q->tasklet);
717 }
718 }
719
720 void qdio_inbound_processing(unsigned long data)
721 {
722 struct qdio_q *q = (struct qdio_q *)data;
723 __qdio_inbound_processing(q);
724 }
725
726 static int get_outbound_buffer_frontier(struct qdio_q *q)
727 {
728 int count, stop;
729 unsigned char state = 0;
730
731 q->timestamp = get_tod_clock_fast();
732
733 if (need_siga_sync(q))
734 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
735 !pci_out_supported(q)) ||
736 (queue_type(q) == QDIO_IQDIO_QFMT &&
737 multicast_outbound(q)))
738 qdio_siga_sync_q(q);
739
740 /*
741 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
742 * would return 0.
743 */
744 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
745 stop = add_buf(q->first_to_check, count);
746 if (q->first_to_check == stop)
747 goto out;
748
749 count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
750 if (!count)
751 goto out;
752
753 switch (state) {
754 case SLSB_P_OUTPUT_EMPTY:
755 /* the adapter got it */
756 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
757 "out empty:%1d %02x", q->nr, count);
758
759 atomic_sub(count, &q->nr_buf_used);
760 q->first_to_check = add_buf(q->first_to_check, count);
761 if (q->irq_ptr->perf_stat_enabled)
762 account_sbals(q, count);
763
764 break;
765 case SLSB_P_OUTPUT_ERROR:
766 process_buffer_error(q, count);
767 q->first_to_check = add_buf(q->first_to_check, count);
768 atomic_sub(count, &q->nr_buf_used);
769 if (q->irq_ptr->perf_stat_enabled)
770 account_sbals_error(q, count);
771 break;
772 case SLSB_CU_OUTPUT_PRIMED:
773 /* the adapter has not fetched the output yet */
774 if (q->irq_ptr->perf_stat_enabled)
775 q->q_stats.nr_sbal_nop++;
776 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
777 q->nr);
778 break;
779 case SLSB_P_OUTPUT_NOT_INIT:
780 case SLSB_P_OUTPUT_HALTED:
781 break;
782 default:
783 WARN_ON_ONCE(1);
784 }
785
786 out:
787 return q->first_to_check;
788 }
789
790 /* all buffers processed? */
791 static inline int qdio_outbound_q_done(struct qdio_q *q)
792 {
793 return atomic_read(&q->nr_buf_used) == 0;
794 }
795
796 static inline int qdio_outbound_q_moved(struct qdio_q *q)
797 {
798 int bufnr;
799
800 bufnr = get_outbound_buffer_frontier(q);
801
802 if (bufnr != q->last_move) {
803 q->last_move = bufnr;
804 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
805 return 1;
806 } else
807 return 0;
808 }
809
810 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
811 {
812 int retries = 0, cc;
813 unsigned int busy_bit;
814
815 if (!need_siga_out(q))
816 return 0;
817
818 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
819 retry:
820 qperf_inc(q, siga_write);
821
822 cc = qdio_siga_output(q, &busy_bit, aob);
823 switch (cc) {
824 case 0:
825 break;
826 case 2:
827 if (busy_bit) {
828 while (++retries < QDIO_BUSY_BIT_RETRIES) {
829 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
830 goto retry;
831 }
832 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
833 cc = -EBUSY;
834 } else {
835 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
836 cc = -ENOBUFS;
837 }
838 break;
839 case 1:
840 case 3:
841 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
842 cc = -EIO;
843 break;
844 }
845 if (retries) {
846 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
847 DBF_ERROR("count:%u", retries);
848 }
849 return cc;
850 }
851
852 static void __qdio_outbound_processing(struct qdio_q *q)
853 {
854 qperf_inc(q, tasklet_outbound);
855 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
856
857 if (qdio_outbound_q_moved(q))
858 qdio_kick_handler(q);
859
860 if (queue_type(q) == QDIO_ZFCP_QFMT)
861 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
862 goto sched;
863
864 if (q->u.out.pci_out_enabled)
865 return;
866
867 /*
868 * Now we know that queue type is either qeth without pci enabled
869 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
870 * is noticed and outbound_handler is called after some time.
871 */
872 if (qdio_outbound_q_done(q))
873 del_timer(&q->u.out.timer);
874 else
875 if (!timer_pending(&q->u.out.timer))
876 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
877 return;
878
879 sched:
880 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
881 return;
882 tasklet_schedule(&q->tasklet);
883 }
884
885 /* outbound tasklet */
886 void qdio_outbound_processing(unsigned long data)
887 {
888 struct qdio_q *q = (struct qdio_q *)data;
889 __qdio_outbound_processing(q);
890 }
891
892 void qdio_outbound_timer(unsigned long data)
893 {
894 struct qdio_q *q = (struct qdio_q *)data;
895
896 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
897 return;
898 tasklet_schedule(&q->tasklet);
899 }
900
901 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
902 {
903 struct qdio_q *out;
904 int i;
905
906 if (!pci_out_supported(q))
907 return;
908
909 for_each_output_queue(q->irq_ptr, out, i)
910 if (!qdio_outbound_q_done(out))
911 tasklet_schedule(&out->tasklet);
912 }
913
914 static void __tiqdio_inbound_processing(struct qdio_q *q)
915 {
916 qperf_inc(q, tasklet_inbound);
917 if (need_siga_sync(q) && need_siga_sync_after_ai(q))
918 qdio_sync_queues(q);
919
920 /*
921 * The interrupt could be caused by a PCI request. Check the
922 * PCI capable outbound queues.
923 */
924 qdio_check_outbound_after_thinint(q);
925
926 if (!qdio_inbound_q_moved(q))
927 return;
928
929 qdio_kick_handler(q);
930
931 if (!qdio_inbound_q_done(q)) {
932 qperf_inc(q, tasklet_inbound_resched);
933 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
934 tasklet_schedule(&q->tasklet);
935 return;
936 }
937 }
938
939 qdio_stop_polling(q);
940 /*
941 * We need to check again to not lose initiative after
942 * resetting the ACK state.
943 */
944 if (!qdio_inbound_q_done(q)) {
945 qperf_inc(q, tasklet_inbound_resched2);
946 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
947 tasklet_schedule(&q->tasklet);
948 }
949 }
950
951 void tiqdio_inbound_processing(unsigned long data)
952 {
953 struct qdio_q *q = (struct qdio_q *)data;
954 __tiqdio_inbound_processing(q);
955 }
956
957 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
958 enum qdio_irq_states state)
959 {
960 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
961
962 irq_ptr->state = state;
963 mb();
964 }
965
966 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
967 {
968 if (irb->esw.esw0.erw.cons) {
969 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
970 DBF_ERROR_HEX(irb, 64);
971 DBF_ERROR_HEX(irb->ecw, 64);
972 }
973 }
974
975 /* PCI interrupt handler */
976 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
977 {
978 int i;
979 struct qdio_q *q;
980
981 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
982 return;
983
984 for_each_input_queue(irq_ptr, q, i) {
985 if (q->u.in.queue_start_poll) {
986 /* skip if polling is enabled or already in work */
987 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
988 &q->u.in.queue_irq_state)) {
989 qperf_inc(q, int_discarded);
990 continue;
991 }
992 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
993 q->irq_ptr->int_parm);
994 } else {
995 tasklet_schedule(&q->tasklet);
996 }
997 }
998
999 if (!pci_out_supported(q))
1000 return;
1001
1002 for_each_output_queue(irq_ptr, q, i) {
1003 if (qdio_outbound_q_done(q))
1004 continue;
1005 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1006 qdio_siga_sync_q(q);
1007 tasklet_schedule(&q->tasklet);
1008 }
1009 }
1010
1011 static void qdio_handle_activate_check(struct ccw_device *cdev,
1012 unsigned long intparm, int cstat, int dstat)
1013 {
1014 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1015 struct qdio_q *q;
1016 int count;
1017
1018 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1019 DBF_ERROR("intp :%lx", intparm);
1020 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1021
1022 if (irq_ptr->nr_input_qs) {
1023 q = irq_ptr->input_qs[0];
1024 } else if (irq_ptr->nr_output_qs) {
1025 q = irq_ptr->output_qs[0];
1026 } else {
1027 dump_stack();
1028 goto no_handler;
1029 }
1030
1031 count = sub_buf(q->first_to_check, q->first_to_kick);
1032 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1033 q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1034 no_handler:
1035 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1036 /*
1037 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1038 * Therefore we call the LGR detection function here.
1039 */
1040 lgr_info_log();
1041 }
1042
1043 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1044 int dstat)
1045 {
1046 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1047
1048 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1049
1050 if (cstat)
1051 goto error;
1052 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1053 goto error;
1054 if (!(dstat & DEV_STAT_DEV_END))
1055 goto error;
1056 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1057 return;
1058
1059 error:
1060 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1061 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1062 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1063 }
1064
1065 /* qdio interrupt handler */
1066 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1067 struct irb *irb)
1068 {
1069 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1070 int cstat, dstat;
1071
1072 if (!intparm || !irq_ptr) {
1073 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1074 return;
1075 }
1076
1077 if (irq_ptr->perf_stat_enabled)
1078 irq_ptr->perf_stat.qdio_int++;
1079
1080 if (IS_ERR(irb)) {
1081 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1082 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1083 wake_up(&cdev->private->wait_q);
1084 return;
1085 }
1086 qdio_irq_check_sense(irq_ptr, irb);
1087 cstat = irb->scsw.cmd.cstat;
1088 dstat = irb->scsw.cmd.dstat;
1089
1090 switch (irq_ptr->state) {
1091 case QDIO_IRQ_STATE_INACTIVE:
1092 qdio_establish_handle_irq(cdev, cstat, dstat);
1093 break;
1094 case QDIO_IRQ_STATE_CLEANUP:
1095 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1096 break;
1097 case QDIO_IRQ_STATE_ESTABLISHED:
1098 case QDIO_IRQ_STATE_ACTIVE:
1099 if (cstat & SCHN_STAT_PCI) {
1100 qdio_int_handler_pci(irq_ptr);
1101 return;
1102 }
1103 if (cstat || dstat)
1104 qdio_handle_activate_check(cdev, intparm, cstat,
1105 dstat);
1106 break;
1107 case QDIO_IRQ_STATE_STOPPED:
1108 break;
1109 default:
1110 WARN_ON_ONCE(1);
1111 }
1112 wake_up(&cdev->private->wait_q);
1113 }
1114
1115 /**
1116 * qdio_get_ssqd_desc - get qdio subchannel description
1117 * @cdev: ccw device to get description for
1118 * @data: where to store the ssqd
1119 *
1120 * Returns 0 or an error code. The results of the chsc are stored in the
1121 * specified structure.
1122 */
1123 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1124 struct qdio_ssqd_desc *data)
1125 {
1126
1127 if (!cdev || !cdev->private)
1128 return -EINVAL;
1129
1130 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1131 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1132 }
1133 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1134
1135 static void qdio_shutdown_queues(struct ccw_device *cdev)
1136 {
1137 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1138 struct qdio_q *q;
1139 int i;
1140
1141 for_each_input_queue(irq_ptr, q, i)
1142 tasklet_kill(&q->tasklet);
1143
1144 for_each_output_queue(irq_ptr, q, i) {
1145 del_timer(&q->u.out.timer);
1146 tasklet_kill(&q->tasklet);
1147 }
1148 }
1149
1150 /**
1151 * qdio_shutdown - shut down a qdio subchannel
1152 * @cdev: associated ccw device
1153 * @how: use halt or clear to shutdown
1154 */
1155 int qdio_shutdown(struct ccw_device *cdev, int how)
1156 {
1157 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1158 int rc;
1159 unsigned long flags;
1160
1161 if (!irq_ptr)
1162 return -ENODEV;
1163
1164 WARN_ON_ONCE(irqs_disabled());
1165 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1166
1167 mutex_lock(&irq_ptr->setup_mutex);
1168 /*
1169 * Subchannel was already shot down. We cannot prevent being called
1170 * twice since cio may trigger a shutdown asynchronously.
1171 */
1172 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1173 mutex_unlock(&irq_ptr->setup_mutex);
1174 return 0;
1175 }
1176
1177 /*
1178 * Indicate that the device is going down. Scheduling the queue
1179 * tasklets is forbidden from here on.
1180 */
1181 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1182
1183 tiqdio_remove_input_queues(irq_ptr);
1184 qdio_shutdown_queues(cdev);
1185 qdio_shutdown_debug_entries(irq_ptr);
1186
1187 /* cleanup subchannel */
1188 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1189
1190 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1191 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1192 else
1193 /* default behaviour is halt */
1194 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1195 if (rc) {
1196 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1197 DBF_ERROR("rc:%4d", rc);
1198 goto no_cleanup;
1199 }
1200
1201 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1202 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1203 wait_event_interruptible_timeout(cdev->private->wait_q,
1204 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1205 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1206 10 * HZ);
1207 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1208
1209 no_cleanup:
1210 qdio_shutdown_thinint(irq_ptr);
1211
1212 /* restore interrupt handler */
1213 if ((void *)cdev->handler == (void *)qdio_int_handler)
1214 cdev->handler = irq_ptr->orig_handler;
1215 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1216
1217 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1218 mutex_unlock(&irq_ptr->setup_mutex);
1219 if (rc)
1220 return rc;
1221 return 0;
1222 }
1223 EXPORT_SYMBOL_GPL(qdio_shutdown);
1224
1225 /**
1226 * qdio_free - free data structures for a qdio subchannel
1227 * @cdev: associated ccw device
1228 */
1229 int qdio_free(struct ccw_device *cdev)
1230 {
1231 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1232
1233 if (!irq_ptr)
1234 return -ENODEV;
1235
1236 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1237 mutex_lock(&irq_ptr->setup_mutex);
1238
1239 if (irq_ptr->debug_area != NULL) {
1240 debug_unregister(irq_ptr->debug_area);
1241 irq_ptr->debug_area = NULL;
1242 }
1243 cdev->private->qdio_data = NULL;
1244 mutex_unlock(&irq_ptr->setup_mutex);
1245
1246 qdio_release_memory(irq_ptr);
1247 return 0;
1248 }
1249 EXPORT_SYMBOL_GPL(qdio_free);
1250
1251 /**
1252 * qdio_allocate - allocate qdio queues and associated data
1253 * @init_data: initialization data
1254 */
1255 int qdio_allocate(struct qdio_initialize *init_data)
1256 {
1257 struct qdio_irq *irq_ptr;
1258
1259 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1260
1261 if ((init_data->no_input_qs && !init_data->input_handler) ||
1262 (init_data->no_output_qs && !init_data->output_handler))
1263 return -EINVAL;
1264
1265 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1266 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1267 return -EINVAL;
1268
1269 if ((!init_data->input_sbal_addr_array) ||
1270 (!init_data->output_sbal_addr_array))
1271 return -EINVAL;
1272
1273 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1274 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1275 if (!irq_ptr)
1276 goto out_err;
1277
1278 mutex_init(&irq_ptr->setup_mutex);
1279 qdio_allocate_dbf(init_data, irq_ptr);
1280
1281 /*
1282 * Allocate a page for the chsc calls in qdio_establish.
1283 * Must be pre-allocated since a zfcp recovery will call
1284 * qdio_establish. In case of low memory and swap on a zfcp disk
1285 * we may not be able to allocate memory otherwise.
1286 */
1287 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1288 if (!irq_ptr->chsc_page)
1289 goto out_rel;
1290
1291 /* qdr is used in ccw1.cda which is u32 */
1292 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1293 if (!irq_ptr->qdr)
1294 goto out_rel;
1295
1296 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1297 init_data->no_output_qs))
1298 goto out_rel;
1299
1300 init_data->cdev->private->qdio_data = irq_ptr;
1301 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1302 return 0;
1303 out_rel:
1304 qdio_release_memory(irq_ptr);
1305 out_err:
1306 return -ENOMEM;
1307 }
1308 EXPORT_SYMBOL_GPL(qdio_allocate);
1309
1310 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1311 {
1312 struct qdio_q *q = irq_ptr->input_qs[0];
1313 int i, use_cq = 0;
1314
1315 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1316 use_cq = 1;
1317
1318 for_each_output_queue(irq_ptr, q, i) {
1319 if (use_cq) {
1320 if (qdio_enable_async_operation(&q->u.out) < 0) {
1321 use_cq = 0;
1322 continue;
1323 }
1324 } else
1325 qdio_disable_async_operation(&q->u.out);
1326 }
1327 DBF_EVENT("use_cq:%d", use_cq);
1328 }
1329
1330 /**
1331 * qdio_establish - establish queues on a qdio subchannel
1332 * @init_data: initialization data
1333 */
1334 int qdio_establish(struct qdio_initialize *init_data)
1335 {
1336 struct qdio_irq *irq_ptr;
1337 struct ccw_device *cdev = init_data->cdev;
1338 unsigned long saveflags;
1339 int rc;
1340
1341 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1342
1343 irq_ptr = cdev->private->qdio_data;
1344 if (!irq_ptr)
1345 return -ENODEV;
1346
1347 if (cdev->private->state != DEV_STATE_ONLINE)
1348 return -EINVAL;
1349
1350 mutex_lock(&irq_ptr->setup_mutex);
1351 qdio_setup_irq(init_data);
1352
1353 rc = qdio_establish_thinint(irq_ptr);
1354 if (rc) {
1355 mutex_unlock(&irq_ptr->setup_mutex);
1356 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1357 return rc;
1358 }
1359
1360 /* establish q */
1361 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1362 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1363 irq_ptr->ccw.count = irq_ptr->equeue.count;
1364 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1365
1366 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1367 ccw_device_set_options_mask(cdev, 0);
1368
1369 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1370 if (rc) {
1371 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1372 DBF_ERROR("rc:%4x", rc);
1373 }
1374 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1375
1376 if (rc) {
1377 mutex_unlock(&irq_ptr->setup_mutex);
1378 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1379 return rc;
1380 }
1381
1382 wait_event_interruptible_timeout(cdev->private->wait_q,
1383 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1384 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1385
1386 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1387 mutex_unlock(&irq_ptr->setup_mutex);
1388 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1389 return -EIO;
1390 }
1391
1392 qdio_setup_ssqd_info(irq_ptr);
1393
1394 qdio_detect_hsicq(irq_ptr);
1395
1396 /* qebsm is now setup if available, initialize buffer states */
1397 qdio_init_buf_states(irq_ptr);
1398
1399 mutex_unlock(&irq_ptr->setup_mutex);
1400 qdio_print_subchannel_info(irq_ptr, cdev);
1401 qdio_setup_debug_entries(irq_ptr, cdev);
1402 return 0;
1403 }
1404 EXPORT_SYMBOL_GPL(qdio_establish);
1405
1406 /**
1407 * qdio_activate - activate queues on a qdio subchannel
1408 * @cdev: associated cdev
1409 */
1410 int qdio_activate(struct ccw_device *cdev)
1411 {
1412 struct qdio_irq *irq_ptr;
1413 int rc;
1414 unsigned long saveflags;
1415
1416 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1417
1418 irq_ptr = cdev->private->qdio_data;
1419 if (!irq_ptr)
1420 return -ENODEV;
1421
1422 if (cdev->private->state != DEV_STATE_ONLINE)
1423 return -EINVAL;
1424
1425 mutex_lock(&irq_ptr->setup_mutex);
1426 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1427 rc = -EBUSY;
1428 goto out;
1429 }
1430
1431 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1432 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1433 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1434 irq_ptr->ccw.cda = 0;
1435
1436 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1437 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1438
1439 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1440 0, DOIO_DENY_PREFETCH);
1441 if (rc) {
1442 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1443 DBF_ERROR("rc:%4x", rc);
1444 }
1445 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1446
1447 if (rc)
1448 goto out;
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 tasklet_schedule(&q->tasklet);
1591 else
1592 /* free the SBALs in case of no further traffic */
1593 if (!timer_pending(&q->u.out.timer))
1594 mod_timer(&q->u.out.timer, jiffies + HZ);
1595 return rc;
1596 }
1597
1598 /**
1599 * do_QDIO - process input or output buffers
1600 * @cdev: associated ccw_device for the qdio subchannel
1601 * @callflags: input or output and special flags from the program
1602 * @q_nr: queue number
1603 * @bufnr: buffer number
1604 * @count: how many buffers to process
1605 */
1606 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1607 int q_nr, unsigned int bufnr, unsigned int count)
1608 {
1609 struct qdio_irq *irq_ptr;
1610
1611 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1612 return -EINVAL;
1613
1614 irq_ptr = cdev->private->qdio_data;
1615 if (!irq_ptr)
1616 return -ENODEV;
1617
1618 DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1619 "do%02x b:%02x c:%02x", callflags, bufnr, count);
1620
1621 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1622 return -EIO;
1623 if (!count)
1624 return 0;
1625 if (callflags & QDIO_FLAG_SYNC_INPUT)
1626 return handle_inbound(irq_ptr->input_qs[q_nr],
1627 callflags, bufnr, count);
1628 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1629 return handle_outbound(irq_ptr->output_qs[q_nr],
1630 callflags, bufnr, count);
1631 return -EINVAL;
1632 }
1633 EXPORT_SYMBOL_GPL(do_QDIO);
1634
1635 /**
1636 * qdio_start_irq - process input buffers
1637 * @cdev: associated ccw_device for the qdio subchannel
1638 * @nr: input queue number
1639 *
1640 * Return codes
1641 * 0 - success
1642 * 1 - irqs not started since new data is available
1643 */
1644 int qdio_start_irq(struct ccw_device *cdev, int nr)
1645 {
1646 struct qdio_q *q;
1647 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1648
1649 if (!irq_ptr)
1650 return -ENODEV;
1651 q = irq_ptr->input_qs[nr];
1652
1653 clear_nonshared_ind(irq_ptr);
1654 qdio_stop_polling(q);
1655 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1656
1657 /*
1658 * We need to check again to not lose initiative after
1659 * resetting the ACK state.
1660 */
1661 if (test_nonshared_ind(irq_ptr))
1662 goto rescan;
1663 if (!qdio_inbound_q_done(q))
1664 goto rescan;
1665 return 0;
1666
1667 rescan:
1668 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1669 &q->u.in.queue_irq_state))
1670 return 0;
1671 else
1672 return 1;
1673
1674 }
1675 EXPORT_SYMBOL(qdio_start_irq);
1676
1677 /**
1678 * qdio_get_next_buffers - process input buffers
1679 * @cdev: associated ccw_device for the qdio subchannel
1680 * @nr: input queue number
1681 * @bufnr: first filled buffer number
1682 * @error: buffers are in error state
1683 *
1684 * Return codes
1685 * < 0 - error
1686 * = 0 - no new buffers found
1687 * > 0 - number of processed buffers
1688 */
1689 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1690 int *error)
1691 {
1692 struct qdio_q *q;
1693 int start, end;
1694 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1695
1696 if (!irq_ptr)
1697 return -ENODEV;
1698 q = irq_ptr->input_qs[nr];
1699
1700 /*
1701 * Cannot rely on automatic sync after interrupt since queues may
1702 * also be examined without interrupt.
1703 */
1704 if (need_siga_sync(q))
1705 qdio_sync_queues(q);
1706
1707 /* check the PCI capable outbound queues. */
1708 qdio_check_outbound_after_thinint(q);
1709
1710 if (!qdio_inbound_q_moved(q))
1711 return 0;
1712
1713 /* Note: upper-layer MUST stop processing immediately here ... */
1714 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1715 return -EIO;
1716
1717 start = q->first_to_kick;
1718 end = q->first_to_check;
1719 *bufnr = start;
1720 *error = q->qdio_error;
1721
1722 /* for the next time */
1723 q->first_to_kick = end;
1724 q->qdio_error = 0;
1725 return sub_buf(end, start);
1726 }
1727 EXPORT_SYMBOL(qdio_get_next_buffers);
1728
1729 /**
1730 * qdio_stop_irq - disable interrupt processing for the device
1731 * @cdev: associated ccw_device for the qdio subchannel
1732 * @nr: input queue number
1733 *
1734 * Return codes
1735 * 0 - interrupts were already disabled
1736 * 1 - interrupts successfully disabled
1737 */
1738 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1739 {
1740 struct qdio_q *q;
1741 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1742
1743 if (!irq_ptr)
1744 return -ENODEV;
1745 q = irq_ptr->input_qs[nr];
1746
1747 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1748 &q->u.in.queue_irq_state))
1749 return 0;
1750 else
1751 return 1;
1752 }
1753 EXPORT_SYMBOL(qdio_stop_irq);
1754
1755 /**
1756 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1757 * @schid: Subchannel ID.
1758 * @cnc: Boolean Change-Notification Control
1759 * @response: Response code will be stored at this address
1760 * @cb: Callback function will be executed for each element
1761 * of the address list
1762 * @priv: Pointer passed from the caller to qdio_pnso_brinfo()
1763 * @type: Type of the address entry passed to the callback
1764 * @entry: Entry containg the address of the specified type
1765 * @priv: Pointer to pass to the callback function.
1766 *
1767 * Performs "Store-network-bridging-information list" operation and calls
1768 * the callback function for every entry in the list. If "change-
1769 * notification-control" is set, further changes in the address list
1770 * will be reported via the IPA command.
1771 */
1772 int qdio_pnso_brinfo(struct subchannel_id schid,
1773 int cnc, u16 *response,
1774 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1775 void *entry),
1776 void *priv)
1777 {
1778 struct chsc_pnso_area *rr;
1779 int rc;
1780 u32 prev_instance = 0;
1781 int isfirstblock = 1;
1782 int i, size, elems;
1783
1784 rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1785 if (rr == NULL)
1786 return -ENOMEM;
1787 do {
1788 /* on the first iteration, naihdr.resume_token will be zero */
1789 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1790 if (rc != 0 && rc != -EBUSY)
1791 goto out;
1792 if (rr->response.code != 1) {
1793 rc = -EIO;
1794 continue;
1795 } else
1796 rc = 0;
1797
1798 if (cb == NULL)
1799 continue;
1800
1801 size = rr->naihdr.naids;
1802 elems = (rr->response.length -
1803 sizeof(struct chsc_header) -
1804 sizeof(struct chsc_brinfo_naihdr)) /
1805 size;
1806
1807 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1808 /* Inform the caller that they need to scrap */
1809 /* the data that was already reported via cb */
1810 rc = -EAGAIN;
1811 break;
1812 }
1813 isfirstblock = 0;
1814 prev_instance = rr->naihdr.instance;
1815 for (i = 0; i < elems; i++)
1816 switch (size) {
1817 case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1818 (*cb)(priv, l3_ipv6_addr,
1819 &rr->entries.l3_ipv6[i]);
1820 break;
1821 case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1822 (*cb)(priv, l3_ipv4_addr,
1823 &rr->entries.l3_ipv4[i]);
1824 break;
1825 case sizeof(struct qdio_brinfo_entry_l2):
1826 (*cb)(priv, l2_addr_lnid,
1827 &rr->entries.l2[i]);
1828 break;
1829 default:
1830 WARN_ON_ONCE(1);
1831 rc = -EIO;
1832 goto out;
1833 }
1834 } while (rr->response.code == 0x0107 || /* channel busy */
1835 (rr->response.code == 1 && /* list stored */
1836 /* resume token is non-zero => list incomplete */
1837 (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1838 (*response) = rr->response.code;
1839
1840 out:
1841 free_page((unsigned long)rr);
1842 return rc;
1843 }
1844 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1845
1846 static int __init init_QDIO(void)
1847 {
1848 int rc;
1849
1850 rc = qdio_debug_init();
1851 if (rc)
1852 return rc;
1853 rc = qdio_setup_init();
1854 if (rc)
1855 goto out_debug;
1856 rc = tiqdio_allocate_memory();
1857 if (rc)
1858 goto out_cache;
1859 rc = tiqdio_register_thinints();
1860 if (rc)
1861 goto out_ti;
1862 return 0;
1863
1864 out_ti:
1865 tiqdio_free_memory();
1866 out_cache:
1867 qdio_setup_exit();
1868 out_debug:
1869 qdio_debug_exit();
1870 return rc;
1871 }
1872
1873 static void __exit exit_QDIO(void)
1874 {
1875 tiqdio_unregister_thinints();
1876 tiqdio_free_memory();
1877 qdio_setup_exit();
1878 qdio_debug_exit();
1879 }
1880
1881 module_init(init_QDIO);
1882 module_exit(exit_QDIO);
Linux kernel - Deliverables
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