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delay capable() check in ext4_has_free_blocks()
[deliverable/linux.git] / drivers / s390 / cio / qdio_main.c
1 /*
2 * linux/drivers/s390/cio/qdio_main.c
3 *
4 * Linux for s390 qdio support, buffer handling, qdio API and module support.
5 *
6 * Copyright 2000,2008 IBM Corp.
7 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
8 * Jan Glauber <jang@linux.vnet.ibm.com>
9 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
10 */
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/timer.h>
15 #include <linux/delay.h>
16 #include <asm/atomic.h>
17 #include <asm/debug.h>
18 #include <asm/qdio.h>
19
20 #include "cio.h"
21 #include "css.h"
22 #include "device.h"
23 #include "qdio.h"
24 #include "qdio_debug.h"
25 #include "qdio_perf.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(struct subchannel_id schid,
33 unsigned int out_mask, unsigned int in_mask)
34 {
35 register unsigned long __fc asm ("0") = 2;
36 register struct subchannel_id __schid asm ("1") = schid;
37 register unsigned long out asm ("2") = out_mask;
38 register unsigned long in asm ("3") = in_mask;
39 int cc;
40
41 asm volatile(
42 " siga 0\n"
43 " ipm %0\n"
44 " srl %0,28\n"
45 : "=d" (cc)
46 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
47 return cc;
48 }
49
50 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
51 {
52 register unsigned long __fc asm ("0") = 1;
53 register struct subchannel_id __schid asm ("1") = schid;
54 register unsigned long __mask asm ("2") = mask;
55 int cc;
56
57 asm volatile(
58 " siga 0\n"
59 " ipm %0\n"
60 " srl %0,28\n"
61 : "=d" (cc)
62 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
63 return cc;
64 }
65
66 /**
67 * do_siga_output - perform SIGA-w/wt function
68 * @schid: subchannel id or in case of QEBSM the subchannel token
69 * @mask: which output queues to process
70 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
71 * @fc: function code to perform
72 *
73 * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
74 * Note: For IQDC unicast queues only the highest priority queue is processed.
75 */
76 static inline int do_siga_output(unsigned long schid, unsigned long mask,
77 u32 *bb, unsigned int fc)
78 {
79 register unsigned long __fc asm("0") = fc;
80 register unsigned long __schid asm("1") = schid;
81 register unsigned long __mask asm("2") = mask;
82 int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
83
84 asm volatile(
85 " siga 0\n"
86 "0: ipm %0\n"
87 " srl %0,28\n"
88 "1:\n"
89 EX_TABLE(0b, 1b)
90 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
91 : : "cc", "memory");
92 *bb = ((unsigned int) __fc) >> 31;
93 return cc;
94 }
95
96 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
97 {
98 char dbf_text[15];
99
100 /* all done or next buffer state different */
101 if (ccq == 0 || ccq == 32)
102 return 0;
103 /* not all buffers processed */
104 if (ccq == 96 || ccq == 97)
105 return 1;
106 /* notify devices immediately */
107 sprintf(dbf_text, "%d", ccq);
108 QDIO_DBF_TEXT2(1, trace, dbf_text);
109 return -EIO;
110 }
111
112 /**
113 * qdio_do_eqbs - extract buffer states for QEBSM
114 * @q: queue to manipulate
115 * @state: state of the extracted buffers
116 * @start: buffer number to start at
117 * @count: count of buffers to examine
118 *
119 * Returns the number of successfull extracted equal buffer states.
120 * Stops processing if a state is different from the last buffers state.
121 */
122 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
123 int start, int count)
124 {
125 unsigned int ccq = 0;
126 int tmp_count = count, tmp_start = start;
127 int nr = q->nr;
128 int rc;
129 char dbf_text[15];
130
131 BUG_ON(!q->irq_ptr->sch_token);
132
133 if (!q->is_input_q)
134 nr += q->irq_ptr->nr_input_qs;
135 again:
136 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
137 rc = qdio_check_ccq(q, ccq);
138
139 /* At least one buffer was processed, return and extract the remaining
140 * buffers later.
141 */
142 if ((ccq == 96) && (count != tmp_count))
143 return (count - tmp_count);
144 if (rc == 1) {
145 QDIO_DBF_TEXT5(1, trace, "eqAGAIN");
146 goto again;
147 }
148
149 if (rc < 0) {
150 QDIO_DBF_TEXT2(1, trace, "eqberr");
151 sprintf(dbf_text, "%2x,%2x,%d,%d", count, tmp_count, ccq, nr);
152 QDIO_DBF_TEXT2(1, trace, dbf_text);
153 q->handler(q->irq_ptr->cdev,
154 QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
155 0, -1, -1, q->irq_ptr->int_parm);
156 return 0;
157 }
158 return count - tmp_count;
159 }
160
161 /**
162 * qdio_do_sqbs - set buffer states for QEBSM
163 * @q: queue to manipulate
164 * @state: new state of the buffers
165 * @start: first buffer number to change
166 * @count: how many buffers to change
167 *
168 * Returns the number of successfully changed buffers.
169 * Does retrying until the specified count of buffer states is set or an
170 * error occurs.
171 */
172 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
173 int count)
174 {
175 unsigned int ccq = 0;
176 int tmp_count = count, tmp_start = start;
177 int nr = q->nr;
178 int rc;
179 char dbf_text[15];
180
181 BUG_ON(!q->irq_ptr->sch_token);
182
183 if (!q->is_input_q)
184 nr += q->irq_ptr->nr_input_qs;
185 again:
186 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
187 rc = qdio_check_ccq(q, ccq);
188 if (rc == 1) {
189 QDIO_DBF_TEXT5(1, trace, "sqAGAIN");
190 goto again;
191 }
192 if (rc < 0) {
193 QDIO_DBF_TEXT3(1, trace, "sqberr");
194 sprintf(dbf_text, "%2x,%2x", count, tmp_count);
195 QDIO_DBF_TEXT3(1, trace, dbf_text);
196 sprintf(dbf_text, "%d,%d", ccq, nr);
197 QDIO_DBF_TEXT3(1, trace, dbf_text);
198
199 q->handler(q->irq_ptr->cdev,
200 QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
201 0, -1, -1, q->irq_ptr->int_parm);
202 return 0;
203 }
204 WARN_ON(tmp_count);
205 return count - tmp_count;
206 }
207
208 /* returns number of examined buffers and their common state in *state */
209 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
210 unsigned char *state, unsigned int count)
211 {
212 unsigned char __state = 0;
213 int i;
214
215 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
216 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
217
218 if (is_qebsm(q))
219 return qdio_do_eqbs(q, state, bufnr, count);
220
221 for (i = 0; i < count; i++) {
222 if (!__state)
223 __state = q->slsb.val[bufnr];
224 else if (q->slsb.val[bufnr] != __state)
225 break;
226 bufnr = next_buf(bufnr);
227 }
228 *state = __state;
229 return i;
230 }
231
232 inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
233 unsigned char *state)
234 {
235 return get_buf_states(q, bufnr, state, 1);
236 }
237
238 /* wrap-around safe setting of slsb states, returns number of changed buffers */
239 static inline int set_buf_states(struct qdio_q *q, int bufnr,
240 unsigned char state, int count)
241 {
242 int i;
243
244 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
245 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
246
247 if (is_qebsm(q))
248 return qdio_do_sqbs(q, state, bufnr, count);
249
250 for (i = 0; i < count; i++) {
251 xchg(&q->slsb.val[bufnr], state);
252 bufnr = next_buf(bufnr);
253 }
254 return count;
255 }
256
257 static inline int set_buf_state(struct qdio_q *q, int bufnr,
258 unsigned char state)
259 {
260 return set_buf_states(q, bufnr, state, 1);
261 }
262
263 /* set slsb states to initial state */
264 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
265 {
266 struct qdio_q *q;
267 int i;
268
269 for_each_input_queue(irq_ptr, q, i)
270 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
271 QDIO_MAX_BUFFERS_PER_Q);
272 for_each_output_queue(irq_ptr, q, i)
273 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
274 QDIO_MAX_BUFFERS_PER_Q);
275 }
276
277 static int qdio_siga_sync(struct qdio_q *q, unsigned int output,
278 unsigned int input)
279 {
280 int cc;
281
282 if (!need_siga_sync(q))
283 return 0;
284
285 qdio_perf_stat_inc(&perf_stats.siga_sync);
286
287 cc = do_siga_sync(q->irq_ptr->schid, output, input);
288 if (cc) {
289 QDIO_DBF_TEXT4(0, trace, "sigasync");
290 QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
291 QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *));
292 }
293 return cc;
294 }
295
296 inline int qdio_siga_sync_q(struct qdio_q *q)
297 {
298 if (q->is_input_q)
299 return qdio_siga_sync(q, 0, q->mask);
300 else
301 return qdio_siga_sync(q, q->mask, 0);
302 }
303
304 static inline int qdio_siga_sync_out(struct qdio_q *q)
305 {
306 return qdio_siga_sync(q, ~0U, 0);
307 }
308
309 static inline int qdio_siga_sync_all(struct qdio_q *q)
310 {
311 return qdio_siga_sync(q, ~0U, ~0U);
312 }
313
314 static inline int qdio_do_siga_output(struct qdio_q *q, unsigned int *busy_bit)
315 {
316 unsigned int fc = 0;
317 unsigned long schid;
318
319 if (q->u.out.use_enh_siga) {
320 fc = 3;
321 }
322 if (!is_qebsm(q))
323 schid = *((u32 *)&q->irq_ptr->schid);
324 else {
325 schid = q->irq_ptr->sch_token;
326 fc |= 0x80;
327 }
328 return do_siga_output(schid, q->mask, busy_bit, fc);
329 }
330
331 static int qdio_siga_output(struct qdio_q *q)
332 {
333 int cc;
334 u32 busy_bit;
335 u64 start_time = 0;
336 char dbf_text[15];
337
338 QDIO_DBF_TEXT5(0, trace, "sigaout");
339 QDIO_DBF_HEX5(0, trace, &q, sizeof(void *));
340
341 qdio_perf_stat_inc(&perf_stats.siga_out);
342 again:
343 cc = qdio_do_siga_output(q, &busy_bit);
344 if (queue_type(q) == QDIO_IQDIO_QFMT && cc == 2 && busy_bit) {
345 sprintf(dbf_text, "bb%4x%2x", q->irq_ptr->schid.sch_no, q->nr);
346 QDIO_DBF_TEXT3(0, trace, dbf_text);
347
348 if (!start_time)
349 start_time = get_usecs();
350 else if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
351 goto again;
352 }
353
354 if (cc == 2 && busy_bit)
355 cc |= QDIO_ERROR_SIGA_BUSY;
356 if (cc)
357 QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *));
358 return cc;
359 }
360
361 static inline int qdio_siga_input(struct qdio_q *q)
362 {
363 int cc;
364
365 QDIO_DBF_TEXT4(0, trace, "sigain");
366 QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
367
368 qdio_perf_stat_inc(&perf_stats.siga_in);
369
370 cc = do_siga_input(q->irq_ptr->schid, q->mask);
371 if (cc)
372 QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *));
373 return cc;
374 }
375
376 /* called from thinint inbound handler */
377 void qdio_sync_after_thinint(struct qdio_q *q)
378 {
379 if (pci_out_supported(q)) {
380 if (need_siga_sync_thinint(q))
381 qdio_siga_sync_all(q);
382 else if (need_siga_sync_out_thinint(q))
383 qdio_siga_sync_out(q);
384 } else
385 qdio_siga_sync_q(q);
386 }
387
388 inline void qdio_stop_polling(struct qdio_q *q)
389 {
390 spin_lock_bh(&q->u.in.lock);
391 if (!q->u.in.polling) {
392 spin_unlock_bh(&q->u.in.lock);
393 return;
394 }
395 q->u.in.polling = 0;
396 qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
397
398 /* show the card that we are not polling anymore */
399 set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT);
400 spin_unlock_bh(&q->u.in.lock);
401 }
402
403 static void announce_buffer_error(struct qdio_q *q)
404 {
405 char dbf_text[15];
406
407 if (q->is_input_q)
408 QDIO_DBF_TEXT3(1, trace, "inperr");
409 else
410 QDIO_DBF_TEXT3(0, trace, "outperr");
411
412 sprintf(dbf_text, "%x-%x-%x", q->first_to_check,
413 q->sbal[q->first_to_check]->element[14].flags,
414 q->sbal[q->first_to_check]->element[15].flags);
415 QDIO_DBF_TEXT3(1, trace, dbf_text);
416 QDIO_DBF_HEX2(1, trace, q->sbal[q->first_to_check], 256);
417
418 q->qdio_error = QDIO_ERROR_SLSB_STATE;
419 }
420
421 static int get_inbound_buffer_frontier(struct qdio_q *q)
422 {
423 int count, stop;
424 unsigned char state;
425
426 /*
427 * If we still poll don't update last_move_ftc, keep the
428 * previously ACK buffer there.
429 */
430 if (!q->u.in.polling)
431 q->last_move_ftc = q->first_to_check;
432
433 /*
434 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
435 * would return 0.
436 */
437 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
438 stop = add_buf(q->first_to_check, count);
439
440 /*
441 * No siga sync here, as a PCI or we after a thin interrupt
442 * will sync the queues.
443 */
444
445 /* need to set count to 1 for non-qebsm */
446 if (!is_qebsm(q))
447 count = 1;
448
449 check_next:
450 if (q->first_to_check == stop)
451 goto out;
452
453 count = get_buf_states(q, q->first_to_check, &state, count);
454 if (!count)
455 goto out;
456
457 switch (state) {
458 case SLSB_P_INPUT_PRIMED:
459 QDIO_DBF_TEXT5(0, trace, "inptprim");
460
461 /*
462 * Only ACK the first buffer. The ACK will be removed in
463 * qdio_stop_polling.
464 */
465 if (q->u.in.polling)
466 state = SLSB_P_INPUT_NOT_INIT;
467 else {
468 q->u.in.polling = 1;
469 state = SLSB_P_INPUT_ACK;
470 }
471 set_buf_state(q, q->first_to_check, state);
472
473 /*
474 * Need to change all PRIMED buffers to NOT_INIT, otherwise
475 * we're loosing initiative in the thinint code.
476 */
477 if (count > 1)
478 set_buf_states(q, next_buf(q->first_to_check),
479 SLSB_P_INPUT_NOT_INIT, count - 1);
480
481 /*
482 * No siga-sync needed for non-qebsm here, as the inbound queue
483 * will be synced on the next siga-r, resp.
484 * tiqdio_is_inbound_q_done will do the siga-sync.
485 */
486 q->first_to_check = add_buf(q->first_to_check, count);
487 atomic_sub(count, &q->nr_buf_used);
488 goto check_next;
489 case SLSB_P_INPUT_ERROR:
490 announce_buffer_error(q);
491 /* process the buffer, the upper layer will take care of it */
492 q->first_to_check = add_buf(q->first_to_check, count);
493 atomic_sub(count, &q->nr_buf_used);
494 break;
495 case SLSB_CU_INPUT_EMPTY:
496 case SLSB_P_INPUT_NOT_INIT:
497 case SLSB_P_INPUT_ACK:
498 QDIO_DBF_TEXT5(0, trace, "inpnipro");
499 break;
500 default:
501 BUG();
502 }
503 out:
504 QDIO_DBF_HEX4(0, trace, &q->first_to_check, sizeof(int));
505 return q->first_to_check;
506 }
507
508 int qdio_inbound_q_moved(struct qdio_q *q)
509 {
510 int bufnr;
511
512 bufnr = get_inbound_buffer_frontier(q);
513
514 if ((bufnr != q->last_move_ftc) || q->qdio_error) {
515 if (!need_siga_sync(q) && !pci_out_supported(q))
516 q->u.in.timestamp = get_usecs();
517
518 QDIO_DBF_TEXT4(0, trace, "inhasmvd");
519 QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
520 return 1;
521 } else
522 return 0;
523 }
524
525 static int qdio_inbound_q_done(struct qdio_q *q)
526 {
527 unsigned char state;
528 #ifdef CONFIG_QDIO_DEBUG
529 char dbf_text[15];
530 #endif
531
532 if (!atomic_read(&q->nr_buf_used))
533 return 1;
534
535 /*
536 * We need that one for synchronization with the adapter, as it
537 * does a kind of PCI avoidance.
538 */
539 qdio_siga_sync_q(q);
540
541 get_buf_state(q, q->first_to_check, &state);
542 if (state == SLSB_P_INPUT_PRIMED)
543 /* we got something to do */
544 return 0;
545
546 /* on VM, we don't poll, so the q is always done here */
547 if (need_siga_sync(q) || pci_out_supported(q))
548 return 1;
549
550 /*
551 * At this point we know, that inbound first_to_check
552 * has (probably) not moved (see qdio_inbound_processing).
553 */
554 if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
555 #ifdef CONFIG_QDIO_DEBUG
556 QDIO_DBF_TEXT4(0, trace, "inqisdon");
557 QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
558 sprintf(dbf_text, "pf%02x", q->first_to_check);
559 QDIO_DBF_TEXT4(0, trace, dbf_text);
560 #endif /* CONFIG_QDIO_DEBUG */
561 return 1;
562 } else {
563 #ifdef CONFIG_QDIO_DEBUG
564 QDIO_DBF_TEXT4(0, trace, "inqisntd");
565 QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
566 sprintf(dbf_text, "pf%02x", q->first_to_check);
567 QDIO_DBF_TEXT4(0, trace, dbf_text);
568 #endif /* CONFIG_QDIO_DEBUG */
569 return 0;
570 }
571 }
572
573 void qdio_kick_inbound_handler(struct qdio_q *q)
574 {
575 int count, start, end;
576 #ifdef CONFIG_QDIO_DEBUG
577 char dbf_text[15];
578 #endif
579
580 qdio_perf_stat_inc(&perf_stats.inbound_handler);
581
582 start = q->first_to_kick;
583 end = q->first_to_check;
584 if (end >= start)
585 count = end - start;
586 else
587 count = end + QDIO_MAX_BUFFERS_PER_Q - start;
588
589 #ifdef CONFIG_QDIO_DEBUG
590 sprintf(dbf_text, "s=%2xc=%2x", start, count);
591 QDIO_DBF_TEXT4(0, trace, dbf_text);
592 #endif /* CONFIG_QDIO_DEBUG */
593
594 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
595 return;
596
597 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr,
598 start, count, q->irq_ptr->int_parm);
599
600 /* for the next time */
601 q->first_to_kick = q->first_to_check;
602 q->qdio_error = 0;
603 }
604
605 static void __qdio_inbound_processing(struct qdio_q *q)
606 {
607 qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
608 again:
609 if (!qdio_inbound_q_moved(q))
610 return;
611
612 qdio_kick_inbound_handler(q);
613
614 if (!qdio_inbound_q_done(q))
615 /* means poll time is not yet over */
616 goto again;
617
618 qdio_stop_polling(q);
619 /*
620 * We need to check again to not lose initiative after
621 * resetting the ACK state.
622 */
623 if (!qdio_inbound_q_done(q))
624 goto again;
625 }
626
627 /* inbound tasklet */
628 void qdio_inbound_processing(unsigned long data)
629 {
630 struct qdio_q *q = (struct qdio_q *)data;
631 __qdio_inbound_processing(q);
632 }
633
634 static int get_outbound_buffer_frontier(struct qdio_q *q)
635 {
636 int count, stop;
637 unsigned char state;
638
639 if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
640 (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
641 qdio_siga_sync_q(q);
642
643 /*
644 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
645 * would return 0.
646 */
647 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
648 stop = add_buf(q->first_to_check, count);
649
650 /* need to set count to 1 for non-qebsm */
651 if (!is_qebsm(q))
652 count = 1;
653
654 check_next:
655 if (q->first_to_check == stop)
656 return q->first_to_check;
657
658 count = get_buf_states(q, q->first_to_check, &state, count);
659 if (!count)
660 return q->first_to_check;
661
662 switch (state) {
663 case SLSB_P_OUTPUT_EMPTY:
664 /* the adapter got it */
665 QDIO_DBF_TEXT5(0, trace, "outpempt");
666
667 atomic_sub(count, &q->nr_buf_used);
668 q->first_to_check = add_buf(q->first_to_check, count);
669 /*
670 * We fetch all buffer states at once. get_buf_states may
671 * return count < stop. For QEBSM we do not loop.
672 */
673 if (is_qebsm(q))
674 break;
675 goto check_next;
676 case SLSB_P_OUTPUT_ERROR:
677 announce_buffer_error(q);
678 /* process the buffer, the upper layer will take care of it */
679 q->first_to_check = add_buf(q->first_to_check, count);
680 atomic_sub(count, &q->nr_buf_used);
681 break;
682 case SLSB_CU_OUTPUT_PRIMED:
683 /* the adapter has not fetched the output yet */
684 QDIO_DBF_TEXT5(0, trace, "outpprim");
685 break;
686 case SLSB_P_OUTPUT_NOT_INIT:
687 case SLSB_P_OUTPUT_HALTED:
688 break;
689 default:
690 BUG();
691 }
692 return q->first_to_check;
693 }
694
695 /* all buffers processed? */
696 static inline int qdio_outbound_q_done(struct qdio_q *q)
697 {
698 return atomic_read(&q->nr_buf_used) == 0;
699 }
700
701 static inline int qdio_outbound_q_moved(struct qdio_q *q)
702 {
703 int bufnr;
704
705 bufnr = get_outbound_buffer_frontier(q);
706
707 if ((bufnr != q->last_move_ftc) || q->qdio_error) {
708 q->last_move_ftc = bufnr;
709 QDIO_DBF_TEXT4(0, trace, "oqhasmvd");
710 QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
711 return 1;
712 } else
713 return 0;
714 }
715
716 /*
717 * VM could present us cc=2 and busy bit set on SIGA-write
718 * during reconfiguration of their Guest LAN (only in iqdio mode,
719 * otherwise qdio is asynchronous and cc=2 and busy bit there will take
720 * the queues down immediately).
721 *
722 * Therefore qdio_siga_output will try for a short time constantly,
723 * if such a condition occurs. If it doesn't change, it will
724 * increase the busy_siga_counter and save the timestamp, and
725 * schedule the queue for later processing. qdio_outbound_processing
726 * will check out the counter. If non-zero, it will call qdio_kick_outbound_q
727 * as often as the value of the counter. This will attempt further SIGA
728 * instructions. For each successful SIGA, the counter is
729 * decreased, for failing SIGAs the counter remains the same, after
730 * all. After some time of no movement, qdio_kick_outbound_q will
731 * finally fail and reflect corresponding error codes to call
732 * the upper layer module and have it take the queues down.
733 *
734 * Note that this is a change from the original HiperSockets design
735 * (saying cc=2 and busy bit means take the queues down), but in
736 * these days Guest LAN didn't exist... excessive cc=2 with busy bit
737 * conditions will still take the queues down, but the threshold is
738 * higher due to the Guest LAN environment.
739 *
740 * Called from outbound tasklet and do_QDIO handler.
741 */
742 static void qdio_kick_outbound_q(struct qdio_q *q)
743 {
744 int rc;
745 #ifdef CONFIG_QDIO_DEBUG
746 char dbf_text[15];
747
748 QDIO_DBF_TEXT5(0, trace, "kickoutq");
749 QDIO_DBF_HEX5(0, trace, &q, sizeof(void *));
750 #endif /* CONFIG_QDIO_DEBUG */
751
752 if (!need_siga_out(q))
753 return;
754
755 rc = qdio_siga_output(q);
756 switch (rc) {
757 case 0:
758 /* TODO: improve error handling for CC=0 case */
759 #ifdef CONFIG_QDIO_DEBUG
760 if (q->u.out.timestamp) {
761 QDIO_DBF_TEXT3(0, trace, "cc2reslv");
762 sprintf(dbf_text, "%4x%2x%2x", q->irq_ptr->schid.sch_no,
763 q->nr,
764 atomic_read(&q->u.out.busy_siga_counter));
765 QDIO_DBF_TEXT3(0, trace, dbf_text);
766 }
767 #endif /* CONFIG_QDIO_DEBUG */
768 /* went smooth this time, reset timestamp */
769 q->u.out.timestamp = 0;
770 break;
771 /* cc=2 and busy bit */
772 case (2 | QDIO_ERROR_SIGA_BUSY):
773 atomic_inc(&q->u.out.busy_siga_counter);
774
775 /* if the last siga was successful, save timestamp here */
776 if (!q->u.out.timestamp)
777 q->u.out.timestamp = get_usecs();
778
779 /* if we're in time, don't touch qdio_error */
780 if (get_usecs() - q->u.out.timestamp < QDIO_BUSY_BIT_GIVE_UP) {
781 tasklet_schedule(&q->tasklet);
782 break;
783 }
784 QDIO_DBF_TEXT2(0, trace, "cc2REPRT");
785 #ifdef CONFIG_QDIO_DEBUG
786 sprintf(dbf_text, "%4x%2x%2x", q->irq_ptr->schid.sch_no, q->nr,
787 atomic_read(&q->u.out.busy_siga_counter));
788 QDIO_DBF_TEXT3(0, trace, dbf_text);
789 #endif /* CONFIG_QDIO_DEBUG */
790 default:
791 /* for plain cc=1, 2 or 3 */
792 q->qdio_error = rc;
793 }
794 }
795
796 static void qdio_kick_outbound_handler(struct qdio_q *q)
797 {
798 int start, end, count;
799 #ifdef CONFIG_QDIO_DEBUG
800 char dbf_text[15];
801 #endif
802
803 start = q->first_to_kick;
804 end = q->last_move_ftc;
805 if (end >= start)
806 count = end - start;
807 else
808 count = end + QDIO_MAX_BUFFERS_PER_Q - start;
809
810 #ifdef CONFIG_QDIO_DEBUG
811 QDIO_DBF_TEXT4(0, trace, "kickouth");
812 QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
813
814 sprintf(dbf_text, "s=%2xc=%2x", start, count);
815 QDIO_DBF_TEXT4(0, trace, dbf_text);
816 #endif /* CONFIG_QDIO_DEBUG */
817
818 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
819 return;
820
821 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
822 q->irq_ptr->int_parm);
823
824 /* for the next time: */
825 q->first_to_kick = q->last_move_ftc;
826 q->qdio_error = 0;
827 }
828
829 static void __qdio_outbound_processing(struct qdio_q *q)
830 {
831 int siga_attempts;
832
833 qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
834
835 /* see comment in qdio_kick_outbound_q */
836 siga_attempts = atomic_read(&q->u.out.busy_siga_counter);
837 while (siga_attempts--) {
838 atomic_dec(&q->u.out.busy_siga_counter);
839 qdio_kick_outbound_q(q);
840 }
841
842 BUG_ON(atomic_read(&q->nr_buf_used) < 0);
843
844 if (qdio_outbound_q_moved(q))
845 qdio_kick_outbound_handler(q);
846
847 if (queue_type(q) == QDIO_ZFCP_QFMT) {
848 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
849 tasklet_schedule(&q->tasklet);
850 return;
851 }
852
853 /* bail out for HiperSockets unicast queues */
854 if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
855 return;
856
857 if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
858 (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) {
859 tasklet_schedule(&q->tasklet);
860 return;
861 }
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 multicast. Make sure buffer switch from PRIMED to
869 * EMPTY 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 qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
877 }
878 }
879 }
880
881 /* outbound tasklet */
882 void qdio_outbound_processing(unsigned long data)
883 {
884 struct qdio_q *q = (struct qdio_q *)data;
885 __qdio_outbound_processing(q);
886 }
887
888 void qdio_outbound_timer(unsigned long data)
889 {
890 struct qdio_q *q = (struct qdio_q *)data;
891 tasklet_schedule(&q->tasklet);
892 }
893
894 /* called from thinint inbound tasklet */
895 void qdio_check_outbound_after_thinint(struct qdio_q *q)
896 {
897 struct qdio_q *out;
898 int i;
899
900 if (!pci_out_supported(q))
901 return;
902
903 for_each_output_queue(q->irq_ptr, out, i)
904 if (!qdio_outbound_q_done(out))
905 tasklet_schedule(&out->tasklet);
906 }
907
908 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
909 enum qdio_irq_states state)
910 {
911 #ifdef CONFIG_QDIO_DEBUG
912 char dbf_text[15];
913
914 QDIO_DBF_TEXT5(0, trace, "newstate");
915 sprintf(dbf_text, "%4x%4x", irq_ptr->schid.sch_no, state);
916 QDIO_DBF_TEXT5(0, trace, dbf_text);
917 #endif /* CONFIG_QDIO_DEBUG */
918
919 irq_ptr->state = state;
920 mb();
921 }
922
923 static void qdio_irq_check_sense(struct subchannel_id schid, struct irb *irb)
924 {
925 char dbf_text[15];
926
927 if (irb->esw.esw0.erw.cons) {
928 sprintf(dbf_text, "sens%4x", schid.sch_no);
929 QDIO_DBF_TEXT2(1, trace, dbf_text);
930 QDIO_DBF_HEX0(0, trace, irb, 64);
931 QDIO_DBF_HEX0(0, trace, irb->ecw, 64);
932 }
933 }
934
935 /* PCI interrupt handler */
936 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
937 {
938 int i;
939 struct qdio_q *q;
940
941 qdio_perf_stat_inc(&perf_stats.pci_int);
942
943 for_each_input_queue(irq_ptr, q, i)
944 tasklet_schedule(&q->tasklet);
945
946 if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
947 return;
948
949 for_each_output_queue(irq_ptr, q, i) {
950 if (qdio_outbound_q_done(q))
951 continue;
952
953 if (!siga_syncs_out_pci(q))
954 qdio_siga_sync_q(q);
955
956 tasklet_schedule(&q->tasklet);
957 }
958 }
959
960 static void qdio_handle_activate_check(struct ccw_device *cdev,
961 unsigned long intparm, int cstat, int dstat)
962 {
963 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
964 struct qdio_q *q;
965 char dbf_text[15];
966
967 QDIO_DBF_TEXT2(1, trace, "ick2");
968 sprintf(dbf_text, "%s", dev_name(&cdev->dev));
969 QDIO_DBF_TEXT2(1, trace, dbf_text);
970 QDIO_DBF_HEX2(0, trace, &intparm, sizeof(int));
971 QDIO_DBF_HEX2(0, trace, &dstat, sizeof(int));
972 QDIO_DBF_HEX2(0, trace, &cstat, sizeof(int));
973
974 if (irq_ptr->nr_input_qs) {
975 q = irq_ptr->input_qs[0];
976 } else if (irq_ptr->nr_output_qs) {
977 q = irq_ptr->output_qs[0];
978 } else {
979 dump_stack();
980 goto no_handler;
981 }
982 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
983 0, -1, -1, irq_ptr->int_parm);
984 no_handler:
985 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
986 }
987
988 static void qdio_call_shutdown(struct work_struct *work)
989 {
990 struct ccw_device_private *priv;
991 struct ccw_device *cdev;
992
993 priv = container_of(work, struct ccw_device_private, kick_work);
994 cdev = priv->cdev;
995 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
996 put_device(&cdev->dev);
997 }
998
999 static void qdio_int_error(struct ccw_device *cdev)
1000 {
1001 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1002
1003 switch (irq_ptr->state) {
1004 case QDIO_IRQ_STATE_INACTIVE:
1005 case QDIO_IRQ_STATE_CLEANUP:
1006 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1007 break;
1008 case QDIO_IRQ_STATE_ESTABLISHED:
1009 case QDIO_IRQ_STATE_ACTIVE:
1010 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1011 if (get_device(&cdev->dev)) {
1012 /* Can't call shutdown from interrupt context. */
1013 PREPARE_WORK(&cdev->private->kick_work,
1014 qdio_call_shutdown);
1015 queue_work(ccw_device_work, &cdev->private->kick_work);
1016 }
1017 break;
1018 default:
1019 WARN_ON(1);
1020 }
1021 wake_up(&cdev->private->wait_q);
1022 }
1023
1024 static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat,
1025 int dstat)
1026 {
1027 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1028
1029 if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
1030 QDIO_DBF_TEXT2(1, setup, "eq:ckcon");
1031 goto error;
1032 }
1033
1034 if (!(dstat & DEV_STAT_DEV_END)) {
1035 QDIO_DBF_TEXT2(1, setup, "eq:no de");
1036 goto error;
1037 }
1038
1039 if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) {
1040 QDIO_DBF_TEXT2(1, setup, "eq:badio");
1041 goto error;
1042 }
1043 return 0;
1044 error:
1045 QDIO_DBF_HEX2(0, trace, &cstat, sizeof(int));
1046 QDIO_DBF_HEX2(0, trace, &dstat, sizeof(int));
1047 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1048 return 1;
1049 }
1050
1051 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1052 int dstat)
1053 {
1054 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1055 char dbf_text[15];
1056
1057 sprintf(dbf_text, "qehi%4x", cdev->private->schid.sch_no);
1058 QDIO_DBF_TEXT0(0, setup, dbf_text);
1059 QDIO_DBF_TEXT0(0, trace, dbf_text);
1060
1061 if (!qdio_establish_check_errors(cdev, cstat, dstat))
1062 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
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 char dbf_text[15];
1072
1073 qdio_perf_stat_inc(&perf_stats.qdio_int);
1074
1075 if (!intparm || !irq_ptr) {
1076 sprintf(dbf_text, "qihd%4x", cdev->private->schid.sch_no);
1077 QDIO_DBF_TEXT2(1, setup, dbf_text);
1078 return;
1079 }
1080
1081 if (IS_ERR(irb)) {
1082 switch (PTR_ERR(irb)) {
1083 case -EIO:
1084 sprintf(dbf_text, "ierr%4x", irq_ptr->schid.sch_no);
1085 QDIO_DBF_TEXT2(1, setup, dbf_text);
1086 qdio_int_error(cdev);
1087 return;
1088 case -ETIMEDOUT:
1089 sprintf(dbf_text, "qtoh%4x", irq_ptr->schid.sch_no);
1090 QDIO_DBF_TEXT2(1, setup, dbf_text);
1091 qdio_int_error(cdev);
1092 return;
1093 default:
1094 WARN_ON(1);
1095 return;
1096 }
1097 }
1098 qdio_irq_check_sense(irq_ptr->schid, irb);
1099
1100 cstat = irb->scsw.cmd.cstat;
1101 dstat = irb->scsw.cmd.dstat;
1102
1103 switch (irq_ptr->state) {
1104 case QDIO_IRQ_STATE_INACTIVE:
1105 qdio_establish_handle_irq(cdev, cstat, dstat);
1106 break;
1107
1108 case QDIO_IRQ_STATE_CLEANUP:
1109 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1110 break;
1111
1112 case QDIO_IRQ_STATE_ESTABLISHED:
1113 case QDIO_IRQ_STATE_ACTIVE:
1114 if (cstat & SCHN_STAT_PCI) {
1115 qdio_int_handler_pci(irq_ptr);
1116 /* no state change so no need to wake up wait_q */
1117 return;
1118 }
1119 if ((cstat & ~SCHN_STAT_PCI) || dstat) {
1120 qdio_handle_activate_check(cdev, intparm, cstat,
1121 dstat);
1122 break;
1123 }
1124 default:
1125 WARN_ON(1);
1126 }
1127 wake_up(&cdev->private->wait_q);
1128 }
1129
1130 /**
1131 * qdio_get_ssqd_desc - get qdio subchannel description
1132 * @cdev: ccw device to get description for
1133 *
1134 * Returns a pointer to the saved qdio subchannel description,
1135 * or NULL for not setup qdio devices.
1136 */
1137 struct qdio_ssqd_desc *qdio_get_ssqd_desc(struct ccw_device *cdev)
1138 {
1139 struct qdio_irq *irq_ptr;
1140 char dbf_text[15];
1141
1142 sprintf(dbf_text, "qssq%4x", cdev->private->schid.sch_no);
1143 QDIO_DBF_TEXT0(0, setup, dbf_text);
1144
1145 irq_ptr = cdev->private->qdio_data;
1146 if (!irq_ptr)
1147 return NULL;
1148
1149 return &irq_ptr->ssqd_desc;
1150 }
1151 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1152
1153 /**
1154 * qdio_cleanup - shutdown queues and free data structures
1155 * @cdev: associated ccw device
1156 * @how: use halt or clear to shutdown
1157 *
1158 * This function calls qdio_shutdown() for @cdev with method @how
1159 * and on success qdio_free() for @cdev.
1160 */
1161 int qdio_cleanup(struct ccw_device *cdev, int how)
1162 {
1163 struct qdio_irq *irq_ptr;
1164 char dbf_text[15];
1165 int rc;
1166
1167 sprintf(dbf_text, "qcln%4x", cdev->private->schid.sch_no);
1168 QDIO_DBF_TEXT0(0, setup, dbf_text);
1169
1170 irq_ptr = cdev->private->qdio_data;
1171 if (!irq_ptr)
1172 return -ENODEV;
1173
1174 rc = qdio_shutdown(cdev, how);
1175 if (rc == 0)
1176 rc = qdio_free(cdev);
1177 return rc;
1178 }
1179 EXPORT_SYMBOL_GPL(qdio_cleanup);
1180
1181 static void qdio_shutdown_queues(struct ccw_device *cdev)
1182 {
1183 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1184 struct qdio_q *q;
1185 int i;
1186
1187 for_each_input_queue(irq_ptr, q, i)
1188 tasklet_disable(&q->tasklet);
1189
1190 for_each_output_queue(irq_ptr, q, i) {
1191 tasklet_disable(&q->tasklet);
1192 del_timer(&q->u.out.timer);
1193 }
1194 }
1195
1196 /**
1197 * qdio_shutdown - shut down a qdio subchannel
1198 * @cdev: associated ccw device
1199 * @how: use halt or clear to shutdown
1200 */
1201 int qdio_shutdown(struct ccw_device *cdev, int how)
1202 {
1203 struct qdio_irq *irq_ptr;
1204 int rc;
1205 unsigned long flags;
1206 char dbf_text[15];
1207
1208 sprintf(dbf_text, "qshu%4x", cdev->private->schid.sch_no);
1209 QDIO_DBF_TEXT0(0, setup, dbf_text);
1210
1211 irq_ptr = cdev->private->qdio_data;
1212 if (!irq_ptr)
1213 return -ENODEV;
1214
1215 mutex_lock(&irq_ptr->setup_mutex);
1216 /*
1217 * Subchannel was already shot down. We cannot prevent being called
1218 * twice since cio may trigger a shutdown asynchronously.
1219 */
1220 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1221 mutex_unlock(&irq_ptr->setup_mutex);
1222 return 0;
1223 }
1224
1225 tiqdio_remove_input_queues(irq_ptr);
1226 qdio_shutdown_queues(cdev);
1227 qdio_shutdown_debug_entries(irq_ptr, cdev);
1228
1229 /* cleanup subchannel */
1230 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1231
1232 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1233 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1234 else
1235 /* default behaviour is halt */
1236 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1237 if (rc) {
1238 sprintf(dbf_text, "sher%4x", irq_ptr->schid.sch_no);
1239 QDIO_DBF_TEXT0(0, setup, dbf_text);
1240 sprintf(dbf_text, "rc=%d", rc);
1241 QDIO_DBF_TEXT0(0, setup, dbf_text);
1242 goto no_cleanup;
1243 }
1244
1245 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1246 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1247 wait_event_interruptible_timeout(cdev->private->wait_q,
1248 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1249 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1250 10 * HZ);
1251 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1252
1253 no_cleanup:
1254 qdio_shutdown_thinint(irq_ptr);
1255
1256 /* restore interrupt handler */
1257 if ((void *)cdev->handler == (void *)qdio_int_handler)
1258 cdev->handler = irq_ptr->orig_handler;
1259 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1260
1261 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1262 mutex_unlock(&irq_ptr->setup_mutex);
1263 if (rc)
1264 return rc;
1265 return 0;
1266 }
1267 EXPORT_SYMBOL_GPL(qdio_shutdown);
1268
1269 /**
1270 * qdio_free - free data structures for a qdio subchannel
1271 * @cdev: associated ccw device
1272 */
1273 int qdio_free(struct ccw_device *cdev)
1274 {
1275 struct qdio_irq *irq_ptr;
1276 char dbf_text[15];
1277
1278 sprintf(dbf_text, "qfre%4x", cdev->private->schid.sch_no);
1279 QDIO_DBF_TEXT0(0, setup, dbf_text);
1280
1281 irq_ptr = cdev->private->qdio_data;
1282 if (!irq_ptr)
1283 return -ENODEV;
1284
1285 mutex_lock(&irq_ptr->setup_mutex);
1286 cdev->private->qdio_data = NULL;
1287 mutex_unlock(&irq_ptr->setup_mutex);
1288
1289 qdio_release_memory(irq_ptr);
1290 return 0;
1291 }
1292 EXPORT_SYMBOL_GPL(qdio_free);
1293
1294 /**
1295 * qdio_initialize - allocate and establish queues for a qdio subchannel
1296 * @init_data: initialization data
1297 *
1298 * This function first allocates queues via qdio_allocate() and on success
1299 * establishes them via qdio_establish().
1300 */
1301 int qdio_initialize(struct qdio_initialize *init_data)
1302 {
1303 int rc;
1304 char dbf_text[15];
1305
1306 sprintf(dbf_text, "qini%4x", init_data->cdev->private->schid.sch_no);
1307 QDIO_DBF_TEXT0(0, setup, dbf_text);
1308
1309 rc = qdio_allocate(init_data);
1310 if (rc)
1311 return rc;
1312
1313 rc = qdio_establish(init_data);
1314 if (rc)
1315 qdio_free(init_data->cdev);
1316 return rc;
1317 }
1318 EXPORT_SYMBOL_GPL(qdio_initialize);
1319
1320 /**
1321 * qdio_allocate - allocate qdio queues and associated data
1322 * @init_data: initialization data
1323 */
1324 int qdio_allocate(struct qdio_initialize *init_data)
1325 {
1326 struct qdio_irq *irq_ptr;
1327 char dbf_text[15];
1328
1329 sprintf(dbf_text, "qalc%4x", init_data->cdev->private->schid.sch_no);
1330 QDIO_DBF_TEXT0(0, setup, dbf_text);
1331
1332 if ((init_data->no_input_qs && !init_data->input_handler) ||
1333 (init_data->no_output_qs && !init_data->output_handler))
1334 return -EINVAL;
1335
1336 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1337 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1338 return -EINVAL;
1339
1340 if ((!init_data->input_sbal_addr_array) ||
1341 (!init_data->output_sbal_addr_array))
1342 return -EINVAL;
1343
1344 qdio_allocate_do_dbf(init_data);
1345
1346 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1347 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1348 if (!irq_ptr)
1349 goto out_err;
1350 QDIO_DBF_TEXT0(0, setup, "irq_ptr:");
1351 QDIO_DBF_HEX0(0, setup, &irq_ptr, sizeof(void *));
1352
1353 mutex_init(&irq_ptr->setup_mutex);
1354
1355 /*
1356 * Allocate a page for the chsc calls in qdio_establish.
1357 * Must be pre-allocated since a zfcp recovery will call
1358 * qdio_establish. In case of low memory and swap on a zfcp disk
1359 * we may not be able to allocate memory otherwise.
1360 */
1361 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1362 if (!irq_ptr->chsc_page)
1363 goto out_rel;
1364
1365 /* qdr is used in ccw1.cda which is u32 */
1366 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1367 if (!irq_ptr->qdr)
1368 goto out_rel;
1369 WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1370
1371 QDIO_DBF_TEXT0(0, setup, "qdr:");
1372 QDIO_DBF_HEX0(0, setup, &irq_ptr->qdr, sizeof(void *));
1373
1374 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1375 init_data->no_output_qs))
1376 goto out_rel;
1377
1378 init_data->cdev->private->qdio_data = irq_ptr;
1379 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1380 return 0;
1381 out_rel:
1382 qdio_release_memory(irq_ptr);
1383 out_err:
1384 return -ENOMEM;
1385 }
1386 EXPORT_SYMBOL_GPL(qdio_allocate);
1387
1388 /**
1389 * qdio_establish - establish queues on a qdio subchannel
1390 * @init_data: initialization data
1391 */
1392 int qdio_establish(struct qdio_initialize *init_data)
1393 {
1394 char dbf_text[20];
1395 struct qdio_irq *irq_ptr;
1396 struct ccw_device *cdev = init_data->cdev;
1397 unsigned long saveflags;
1398 int rc;
1399
1400 sprintf(dbf_text, "qest%4x", cdev->private->schid.sch_no);
1401 QDIO_DBF_TEXT0(0, setup, dbf_text);
1402
1403 irq_ptr = cdev->private->qdio_data;
1404 if (!irq_ptr)
1405 return -ENODEV;
1406
1407 if (cdev->private->state != DEV_STATE_ONLINE)
1408 return -EINVAL;
1409
1410 mutex_lock(&irq_ptr->setup_mutex);
1411 qdio_setup_irq(init_data);
1412
1413 rc = qdio_establish_thinint(irq_ptr);
1414 if (rc) {
1415 mutex_unlock(&irq_ptr->setup_mutex);
1416 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1417 return rc;
1418 }
1419
1420 /* establish q */
1421 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1422 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1423 irq_ptr->ccw.count = irq_ptr->equeue.count;
1424 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1425
1426 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1427 ccw_device_set_options_mask(cdev, 0);
1428
1429 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1430 if (rc) {
1431 sprintf(dbf_text, "eq:io%4x", irq_ptr->schid.sch_no);
1432 QDIO_DBF_TEXT2(1, setup, dbf_text);
1433 sprintf(dbf_text, "eq:rc%4x", rc);
1434 QDIO_DBF_TEXT2(1, setup, dbf_text);
1435 }
1436 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1437
1438 if (rc) {
1439 mutex_unlock(&irq_ptr->setup_mutex);
1440 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1441 return rc;
1442 }
1443
1444 wait_event_interruptible_timeout(cdev->private->wait_q,
1445 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1446 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1447
1448 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1449 mutex_unlock(&irq_ptr->setup_mutex);
1450 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1451 return -EIO;
1452 }
1453
1454 qdio_setup_ssqd_info(irq_ptr);
1455 sprintf(dbf_text, "qDmmwc%2x", irq_ptr->ssqd_desc.mmwc);
1456 QDIO_DBF_TEXT2(0, setup, dbf_text);
1457 sprintf(dbf_text, "qib ac%2x", irq_ptr->qib.ac);
1458 QDIO_DBF_TEXT2(0, setup, dbf_text);
1459
1460 /* qebsm is now setup if available, initialize buffer states */
1461 qdio_init_buf_states(irq_ptr);
1462
1463 mutex_unlock(&irq_ptr->setup_mutex);
1464 qdio_print_subchannel_info(irq_ptr, cdev);
1465 qdio_setup_debug_entries(irq_ptr, cdev);
1466 return 0;
1467 }
1468 EXPORT_SYMBOL_GPL(qdio_establish);
1469
1470 /**
1471 * qdio_activate - activate queues on a qdio subchannel
1472 * @cdev: associated cdev
1473 */
1474 int qdio_activate(struct ccw_device *cdev)
1475 {
1476 struct qdio_irq *irq_ptr;
1477 int rc;
1478 unsigned long saveflags;
1479 char dbf_text[20];
1480
1481 sprintf(dbf_text, "qact%4x", cdev->private->schid.sch_no);
1482 QDIO_DBF_TEXT0(0, setup, dbf_text);
1483
1484 irq_ptr = cdev->private->qdio_data;
1485 if (!irq_ptr)
1486 return -ENODEV;
1487
1488 if (cdev->private->state != DEV_STATE_ONLINE)
1489 return -EINVAL;
1490
1491 mutex_lock(&irq_ptr->setup_mutex);
1492 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1493 rc = -EBUSY;
1494 goto out;
1495 }
1496
1497 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1498 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1499 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1500 irq_ptr->ccw.cda = 0;
1501
1502 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1503 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1504
1505 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1506 0, DOIO_DENY_PREFETCH);
1507 if (rc) {
1508 sprintf(dbf_text, "aq:io%4x", irq_ptr->schid.sch_no);
1509 QDIO_DBF_TEXT2(1, setup, dbf_text);
1510 sprintf(dbf_text, "aq:rc%4x", rc);
1511 QDIO_DBF_TEXT2(1, setup, dbf_text);
1512 }
1513 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1514
1515 if (rc)
1516 goto out;
1517
1518 if (is_thinint_irq(irq_ptr))
1519 tiqdio_add_input_queues(irq_ptr);
1520
1521 /* wait for subchannel to become active */
1522 msleep(5);
1523
1524 switch (irq_ptr->state) {
1525 case QDIO_IRQ_STATE_STOPPED:
1526 case QDIO_IRQ_STATE_ERR:
1527 mutex_unlock(&irq_ptr->setup_mutex);
1528 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1529 return -EIO;
1530 default:
1531 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1532 rc = 0;
1533 }
1534 out:
1535 mutex_unlock(&irq_ptr->setup_mutex);
1536 return rc;
1537 }
1538 EXPORT_SYMBOL_GPL(qdio_activate);
1539
1540 static inline int buf_in_between(int bufnr, int start, int count)
1541 {
1542 int end = add_buf(start, count);
1543
1544 if (end > start) {
1545 if (bufnr >= start && bufnr < end)
1546 return 1;
1547 else
1548 return 0;
1549 }
1550
1551 /* wrap-around case */
1552 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1553 (bufnr < end))
1554 return 1;
1555 else
1556 return 0;
1557 }
1558
1559 /**
1560 * handle_inbound - reset processed input buffers
1561 * @q: queue containing the buffers
1562 * @callflags: flags
1563 * @bufnr: first buffer to process
1564 * @count: how many buffers are emptied
1565 */
1566 static void handle_inbound(struct qdio_q *q, unsigned int callflags,
1567 int bufnr, int count)
1568 {
1569 unsigned long flags;
1570 int used, rc;
1571
1572 /*
1573 * do_QDIO could run in parallel with the queue tasklet so the
1574 * upper-layer programm could empty the ACK'ed buffer here.
1575 * If that happens we must clear the polling flag, otherwise
1576 * qdio_stop_polling() could set the buffer to NOT_INIT after
1577 * it was set to EMPTY which would kill us.
1578 */
1579 spin_lock_irqsave(&q->u.in.lock, flags);
1580 if (q->u.in.polling)
1581 if (buf_in_between(q->last_move_ftc, bufnr, count))
1582 q->u.in.polling = 0;
1583
1584 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1585 spin_unlock_irqrestore(&q->u.in.lock, flags);
1586
1587 used = atomic_add_return(count, &q->nr_buf_used) - count;
1588 BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1589
1590 /* no need to signal as long as the adapter had free buffers */
1591 if (used)
1592 return;
1593
1594 if (need_siga_in(q)) {
1595 rc = qdio_siga_input(q);
1596 if (rc)
1597 q->qdio_error = rc;
1598 }
1599 }
1600
1601 /**
1602 * handle_outbound - process filled outbound buffers
1603 * @q: queue containing the buffers
1604 * @callflags: flags
1605 * @bufnr: first buffer to process
1606 * @count: how many buffers are filled
1607 */
1608 static void handle_outbound(struct qdio_q *q, unsigned int callflags,
1609 int bufnr, int count)
1610 {
1611 unsigned char state;
1612 int used;
1613
1614 qdio_perf_stat_inc(&perf_stats.outbound_handler);
1615
1616 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1617 used = atomic_add_return(count, &q->nr_buf_used);
1618 BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1619
1620 if (callflags & QDIO_FLAG_PCI_OUT)
1621 q->u.out.pci_out_enabled = 1;
1622 else
1623 q->u.out.pci_out_enabled = 0;
1624
1625 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1626 if (multicast_outbound(q))
1627 qdio_kick_outbound_q(q);
1628 else
1629 if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1630 (count > 1) &&
1631 (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1632 /* exploit enhanced SIGA */
1633 q->u.out.use_enh_siga = 1;
1634 qdio_kick_outbound_q(q);
1635 } else {
1636 /*
1637 * One siga-w per buffer required for unicast
1638 * HiperSockets.
1639 */
1640 q->u.out.use_enh_siga = 0;
1641 while (count--)
1642 qdio_kick_outbound_q(q);
1643 }
1644 goto out;
1645 }
1646
1647 if (need_siga_sync(q)) {
1648 qdio_siga_sync_q(q);
1649 goto out;
1650 }
1651
1652 /* try to fast requeue buffers */
1653 get_buf_state(q, prev_buf(bufnr), &state);
1654 if (state != SLSB_CU_OUTPUT_PRIMED)
1655 qdio_kick_outbound_q(q);
1656 else {
1657 QDIO_DBF_TEXT5(0, trace, "fast-req");
1658 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1659 }
1660 out:
1661 /* Fixme: could wait forever if called from process context */
1662 tasklet_schedule(&q->tasklet);
1663 }
1664
1665 /**
1666 * do_QDIO - process input or output buffers
1667 * @cdev: associated ccw_device for the qdio subchannel
1668 * @callflags: input or output and special flags from the program
1669 * @q_nr: queue number
1670 * @bufnr: buffer number
1671 * @count: how many buffers to process
1672 */
1673 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1674 int q_nr, int bufnr, int count)
1675 {
1676 struct qdio_irq *irq_ptr;
1677 #ifdef CONFIG_QDIO_DEBUG
1678 char dbf_text[20];
1679
1680 sprintf(dbf_text, "doQD%4x", cdev->private->schid.sch_no);
1681 QDIO_DBF_TEXT3(0, trace, dbf_text);
1682 #endif /* CONFIG_QDIO_DEBUG */
1683
1684 if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1685 (count > QDIO_MAX_BUFFERS_PER_Q) ||
1686 (q_nr > QDIO_MAX_QUEUES_PER_IRQ))
1687 return -EINVAL;
1688
1689 if (!count)
1690 return 0;
1691
1692 irq_ptr = cdev->private->qdio_data;
1693 if (!irq_ptr)
1694 return -ENODEV;
1695
1696 #ifdef CONFIG_QDIO_DEBUG
1697 if (callflags & QDIO_FLAG_SYNC_INPUT)
1698 QDIO_DBF_HEX3(0, trace, &irq_ptr->input_qs[q_nr],
1699 sizeof(void *));
1700 else
1701 QDIO_DBF_HEX3(0, trace, &irq_ptr->output_qs[q_nr],
1702 sizeof(void *));
1703
1704 sprintf(dbf_text, "flag%04x", callflags);
1705 QDIO_DBF_TEXT3(0, trace, dbf_text);
1706 sprintf(dbf_text, "qi%02xct%02x", bufnr, count);
1707 QDIO_DBF_TEXT3(0, trace, dbf_text);
1708 #endif /* CONFIG_QDIO_DEBUG */
1709
1710 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1711 return -EBUSY;
1712
1713 if (callflags & QDIO_FLAG_SYNC_INPUT)
1714 handle_inbound(irq_ptr->input_qs[q_nr],
1715 callflags, bufnr, count);
1716 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1717 handle_outbound(irq_ptr->output_qs[q_nr],
1718 callflags, bufnr, count);
1719 else {
1720 QDIO_DBF_TEXT3(1, trace, "doQD:inv");
1721 return -EINVAL;
1722 }
1723 return 0;
1724 }
1725 EXPORT_SYMBOL_GPL(do_QDIO);
1726
1727 static int __init init_QDIO(void)
1728 {
1729 int rc;
1730
1731 rc = qdio_setup_init();
1732 if (rc)
1733 return rc;
1734 rc = tiqdio_allocate_memory();
1735 if (rc)
1736 goto out_cache;
1737 rc = qdio_debug_init();
1738 if (rc)
1739 goto out_ti;
1740 rc = qdio_setup_perf_stats();
1741 if (rc)
1742 goto out_debug;
1743 rc = tiqdio_register_thinints();
1744 if (rc)
1745 goto out_perf;
1746 return 0;
1747
1748 out_perf:
1749 qdio_remove_perf_stats();
1750 out_debug:
1751 qdio_debug_exit();
1752 out_ti:
1753 tiqdio_free_memory();
1754 out_cache:
1755 qdio_setup_exit();
1756 return rc;
1757 }
1758
1759 static void __exit exit_QDIO(void)
1760 {
1761 tiqdio_unregister_thinints();
1762 tiqdio_free_memory();
1763 qdio_remove_perf_stats();
1764 qdio_debug_exit();
1765 qdio_setup_exit();
1766 }
1767
1768 module_init(init_QDIO);
1769 module_exit(exit_QDIO);
Linux kernel - Deliverables
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