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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / s390 / cio / qdio_main.c
blob3ef8d071c64a683316a01b6e12ecd68f3d6f1d9d
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 <linux/gfp.h>
17 #include <linux/io.h>
18 #include <linux/atomic.h>
19 #include <asm/debug.h>
20 #include <asm/qdio.h>
21
22 #include "cio.h"
23 #include "css.h"
24 #include "device.h"
25 #include "qdio.h"
26 #include "qdio_debug.h"
27
28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
29 "Jan Glauber <jang@linux.vnet.ibm.com>");
30 MODULE_DESCRIPTION("QDIO base support");
31 MODULE_LICENSE("GPL");
32
33 static inline int do_siga_sync(unsigned long schid,
34 unsigned int out_mask, unsigned int in_mask,
35 unsigned int fc)
36 {
37 register unsigned long __fc asm ("0") = fc;
38 register unsigned long __schid asm ("1") = schid;
39 register unsigned long out asm ("2") = out_mask;
40 register unsigned long in asm ("3") = in_mask;
41 int cc;
42
43 asm volatile(
44 " siga 0\n"
45 " ipm %0\n"
46 " srl %0,28\n"
47 : "=d" (cc)
48 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
49 return cc;
50 }
51
52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
53 unsigned int fc)
54 {
55 register unsigned long __fc asm ("0") = fc;
56 register unsigned long __schid asm ("1") = schid;
57 register unsigned long __mask asm ("2") = mask;
58 int cc;
59
60 asm volatile(
61 " siga 0\n"
62 " ipm %0\n"
63 " srl %0,28\n"
64 : "=d" (cc)
65 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
66 return cc;
67 }
68
69 /**
70 * do_siga_output - perform SIGA-w/wt function
71 * @schid: subchannel id or in case of QEBSM the subchannel token
72 * @mask: which output queues to process
73 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
74 * @fc: function code to perform
75 *
76 * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
77 * Note: For IQDC unicast queues only the highest priority queue is processed.
78 */
79 static inline int do_siga_output(unsigned long schid, unsigned long mask,
80 unsigned int *bb, unsigned int fc,
81 unsigned long aob)
82 {
83 register unsigned long __fc asm("0") = fc;
84 register unsigned long __schid asm("1") = schid;
85 register unsigned long __mask asm("2") = mask;
86 register unsigned long __aob asm("3") = aob;
87 int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
88
89 asm volatile(
90 " siga 0\n"
91 "0: ipm %0\n"
92 " srl %0,28\n"
93 "1:\n"
94 EX_TABLE(0b, 1b)
95 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask),
96 "+d" (__aob)
97 : : "cc", "memory");
98 *bb = ((unsigned int) __fc) >> 31;
99 return cc;
100 }
101
102 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
103 {
104 /* all done or next buffer state different */
105 if (ccq == 0 || ccq == 32)
106 return 0;
107 /* no buffer processed */
108 if (ccq == 97)
109 return 1;
110 /* not all buffers processed */
111 if (ccq == 96)
112 return 2;
113 /* notify devices immediately */
114 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
115 return -EIO;
116 }
117
118 /**
119 * qdio_do_eqbs - extract buffer states for QEBSM
120 * @q: queue to manipulate
121 * @state: state of the extracted buffers
122 * @start: buffer number to start at
123 * @count: count of buffers to examine
124 * @auto_ack: automatically acknowledge buffers
125 *
126 * Returns the number of successfully extracted equal buffer states.
127 * Stops processing if a state is different from the last buffers state.
128 */
129 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
130 int start, int count, int auto_ack)
131 {
132 int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
133 unsigned int ccq = 0;
134
135 BUG_ON(!q->irq_ptr->sch_token);
136 qperf_inc(q, eqbs);
137
138 if (!q->is_input_q)
139 nr += q->irq_ptr->nr_input_qs;
140 again:
141 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
142 auto_ack);
143 rc = qdio_check_ccq(q, ccq);
144 if (!rc)
145 return count - tmp_count;
146
147 if (rc == 1) {
148 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
149 goto again;
150 }
151
152 if (rc == 2) {
153 BUG_ON(tmp_count == count);
154 qperf_inc(q, eqbs_partial);
155 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
156 tmp_count);
157 /*
158 * Retry once, if that fails bail out and process the
159 * extracted buffers before trying again.
160 */
161 if (!retried++)
162 goto again;
163 else
164 return count - tmp_count;
165 }
166
167 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
168 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
169 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
170 0, -1, -1, q->irq_ptr->int_parm);
171 return 0;
172 }
173
174 /**
175 * qdio_do_sqbs - set buffer states for QEBSM
176 * @q: queue to manipulate
177 * @state: new state of the buffers
178 * @start: first buffer number to change
179 * @count: how many buffers to change
180 *
181 * Returns the number of successfully changed buffers.
182 * Does retrying until the specified count of buffer states is set or an
183 * error occurs.
184 */
185 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
186 int count)
187 {
188 unsigned int ccq = 0;
189 int tmp_count = count, tmp_start = start;
190 int nr = q->nr;
191 int rc;
192
193 if (!count)
194 return 0;
195
196 BUG_ON(!q->irq_ptr->sch_token);
197 qperf_inc(q, sqbs);
198
199 if (!q->is_input_q)
200 nr += q->irq_ptr->nr_input_qs;
201 again:
202 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
203 rc = qdio_check_ccq(q, ccq);
204 if (!rc) {
205 WARN_ON(tmp_count);
206 return count - tmp_count;
207 }
208
209 if (rc == 1 || rc == 2) {
210 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
211 qperf_inc(q, sqbs_partial);
212 goto again;
213 }
214
215 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
216 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
217 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
218 0, -1, -1, q->irq_ptr->int_parm);
219 return 0;
220 }
221
222 /* returns number of examined buffers and their common state in *state */
223 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
224 unsigned char *state, unsigned int count,
225 int auto_ack, int merge_pending)
226 {
227 unsigned char __state = 0;
228 int i;
229
230 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
231 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
232
233 if (is_qebsm(q))
234 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
235
236 for (i = 0; i < count; i++) {
237 if (!__state) {
238 __state = q->slsb.val[bufnr];
239 if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
240 __state = SLSB_P_OUTPUT_EMPTY;
241 } else if (merge_pending) {
242 if ((q->slsb.val[bufnr] & __state) != __state)
243 break;
244 } else if (q->slsb.val[bufnr] != __state)
245 break;
246 bufnr = next_buf(bufnr);
247 }
248 *state = __state;
249 return i;
250 }
251
252 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
253 unsigned char *state, int auto_ack)
254 {
255 return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
256 }
257
258 /* wrap-around safe setting of slsb states, returns number of changed buffers */
259 static inline int set_buf_states(struct qdio_q *q, int bufnr,
260 unsigned char state, int count)
261 {
262 int i;
263
264 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
265 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
266
267 if (is_qebsm(q))
268 return qdio_do_sqbs(q, state, bufnr, count);
269
270 for (i = 0; i < count; i++) {
271 xchg(&q->slsb.val[bufnr], state);
272 bufnr = next_buf(bufnr);
273 }
274 return count;
275 }
276
277 static inline int set_buf_state(struct qdio_q *q, int bufnr,
278 unsigned char state)
279 {
280 return set_buf_states(q, bufnr, state, 1);
281 }
282
283 /* set slsb states to initial state */
284 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
285 {
286 struct qdio_q *q;
287 int i;
288
289 for_each_input_queue(irq_ptr, q, i)
290 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
291 QDIO_MAX_BUFFERS_PER_Q);
292 for_each_output_queue(irq_ptr, q, i)
293 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
294 QDIO_MAX_BUFFERS_PER_Q);
295 }
296
297 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
298 unsigned int input)
299 {
300 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
301 unsigned int fc = QDIO_SIGA_SYNC;
302 int cc;
303
304 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
305 qperf_inc(q, siga_sync);
306
307 if (is_qebsm(q)) {
308 schid = q->irq_ptr->sch_token;
309 fc |= QDIO_SIGA_QEBSM_FLAG;
310 }
311
312 cc = do_siga_sync(schid, output, input, fc);
313 if (unlikely(cc))
314 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
315 return cc;
316 }
317
318 static inline int qdio_siga_sync_q(struct qdio_q *q)
319 {
320 if (q->is_input_q)
321 return qdio_siga_sync(q, 0, q->mask);
322 else
323 return qdio_siga_sync(q, q->mask, 0);
324 }
325
326 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
327 unsigned long aob)
328 {
329 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
330 unsigned int fc = QDIO_SIGA_WRITE;
331 u64 start_time = 0;
332 int retries = 0, cc;
333 unsigned long laob = 0;
334
335 if (q->u.out.use_cq && aob != 0) {
336 fc = QDIO_SIGA_WRITEQ;
337 laob = aob;
338 }
339
340 if (is_qebsm(q)) {
341 schid = q->irq_ptr->sch_token;
342 fc |= QDIO_SIGA_QEBSM_FLAG;
343 }
344 again:
345 WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
346 (aob && fc != QDIO_SIGA_WRITEQ));
347 cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
348
349 /* hipersocket busy condition */
350 if (unlikely(*busy_bit)) {
351 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
352 retries++;
353
354 if (!start_time) {
355 start_time = get_clock();
356 goto again;
357 }
358 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
359 goto again;
360 }
361 if (retries) {
362 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
363 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
364 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
365 }
366 return cc;
367 }
368
369 static inline int qdio_siga_input(struct qdio_q *q)
370 {
371 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
372 unsigned int fc = QDIO_SIGA_READ;
373 int cc;
374
375 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
376 qperf_inc(q, siga_read);
377
378 if (is_qebsm(q)) {
379 schid = q->irq_ptr->sch_token;
380 fc |= QDIO_SIGA_QEBSM_FLAG;
381 }
382
383 cc = do_siga_input(schid, q->mask, fc);
384 if (unlikely(cc))
385 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
386 return cc;
387 }
388
389 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
390 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
391
392 static inline void qdio_sync_queues(struct qdio_q *q)
393 {
394 /* PCI capable outbound queues will also be scanned so sync them too */
395 if (pci_out_supported(q))
396 qdio_siga_sync_all(q);
397 else
398 qdio_siga_sync_q(q);
399 }
400
401 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
402 unsigned char *state)
403 {
404 if (need_siga_sync(q))
405 qdio_siga_sync_q(q);
406 return get_buf_states(q, bufnr, state, 1, 0, 0);
407 }
408
409 static inline void qdio_stop_polling(struct qdio_q *q)
410 {
411 if (!q->u.in.polling)
412 return;
413
414 q->u.in.polling = 0;
415 qperf_inc(q, stop_polling);
416
417 /* show the card that we are not polling anymore */
418 if (is_qebsm(q)) {
419 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
420 q->u.in.ack_count);
421 q->u.in.ack_count = 0;
422 } else
423 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
424 }
425
426 static inline void account_sbals(struct qdio_q *q, int count)
427 {
428 int pos = 0;
429
430 q->q_stats.nr_sbal_total += count;
431 if (count == QDIO_MAX_BUFFERS_MASK) {
432 q->q_stats.nr_sbals[7]++;
433 return;
434 }
435 while (count >>= 1)
436 pos++;
437 q->q_stats.nr_sbals[pos]++;
438 }
439
440 static void process_buffer_error(struct qdio_q *q, int count)
441 {
442 unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
443 SLSB_P_OUTPUT_NOT_INIT;
444
445 q->qdio_error |= QDIO_ERROR_SLSB_STATE;
446
447 /* special handling for no target buffer empty */
448 if ((!q->is_input_q &&
449 (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
450 qperf_inc(q, target_full);
451 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
452 q->first_to_check);
453 goto set;
454 }
455
456 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
457 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
458 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
459 DBF_ERROR("F14:%2x F15:%2x",
460 q->sbal[q->first_to_check]->element[14].sflags,
461 q->sbal[q->first_to_check]->element[15].sflags);
462
463 set:
464 /*
465 * Interrupts may be avoided as long as the error is present
466 * so change the buffer state immediately to avoid starvation.
467 */
468 set_buf_states(q, q->first_to_check, state, count);
469 }
470
471 static inline void inbound_primed(struct qdio_q *q, int count)
472 {
473 int new;
474
475 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
476
477 /* for QEBSM the ACK was already set by EQBS */
478 if (is_qebsm(q)) {
479 if (!q->u.in.polling) {
480 q->u.in.polling = 1;
481 q->u.in.ack_count = count;
482 q->u.in.ack_start = q->first_to_check;
483 return;
484 }
485
486 /* delete the previous ACK's */
487 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
488 q->u.in.ack_count);
489 q->u.in.ack_count = count;
490 q->u.in.ack_start = q->first_to_check;
491 return;
492 }
493
494 /*
495 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
496 * or by the next inbound run.
497 */
498 new = add_buf(q->first_to_check, count - 1);
499 if (q->u.in.polling) {
500 /* reset the previous ACK but first set the new one */
501 set_buf_state(q, new, SLSB_P_INPUT_ACK);
502 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
503 } else {
504 q->u.in.polling = 1;
505 set_buf_state(q, new, SLSB_P_INPUT_ACK);
506 }
507
508 q->u.in.ack_start = new;
509 count--;
510 if (!count)
511 return;
512 /* need to change ALL buffers to get more interrupts */
513 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
514 }
515
516 static int get_inbound_buffer_frontier(struct qdio_q *q)
517 {
518 int count, stop;
519 unsigned char state = 0;
520
521 q->timestamp = get_clock_fast();
522
523 /*
524 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
525 * would return 0.
526 */
527 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
528 stop = add_buf(q->first_to_check, count);
529
530 if (q->first_to_check == stop)
531 goto out;
532
533 /*
534 * No siga sync here, as a PCI or we after a thin interrupt
535 * already sync'ed the queues.
536 */
537 count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
538 if (!count)
539 goto out;
540
541 switch (state) {
542 case SLSB_P_INPUT_PRIMED:
543 inbound_primed(q, count);
544 q->first_to_check = add_buf(q->first_to_check, count);
545 if (atomic_sub(count, &q->nr_buf_used) == 0)
546 qperf_inc(q, inbound_queue_full);
547 if (q->irq_ptr->perf_stat_enabled)
548 account_sbals(q, count);
549 break;
550 case SLSB_P_INPUT_ERROR:
551 process_buffer_error(q, count);
552 q->first_to_check = add_buf(q->first_to_check, count);
553 atomic_sub(count, &q->nr_buf_used);
554 if (q->irq_ptr->perf_stat_enabled)
555 account_sbals_error(q, count);
556 break;
557 case SLSB_CU_INPUT_EMPTY:
558 case SLSB_P_INPUT_NOT_INIT:
559 case SLSB_P_INPUT_ACK:
560 if (q->irq_ptr->perf_stat_enabled)
561 q->q_stats.nr_sbal_nop++;
562 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
563 break;
564 default:
565 BUG();
566 }
567 out:
568 return q->first_to_check;
569 }
570
571 static int qdio_inbound_q_moved(struct qdio_q *q)
572 {
573 int bufnr;
574
575 bufnr = get_inbound_buffer_frontier(q);
576
577 if ((bufnr != q->last_move) || q->qdio_error) {
578 q->last_move = bufnr;
579 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
580 q->u.in.timestamp = get_clock();
581 return 1;
582 } else
583 return 0;
584 }
585
586 static inline int qdio_inbound_q_done(struct qdio_q *q)
587 {
588 unsigned char state = 0;
589
590 if (!atomic_read(&q->nr_buf_used))
591 return 1;
592
593 if (need_siga_sync(q))
594 qdio_siga_sync_q(q);
595 get_buf_state(q, q->first_to_check, &state, 0);
596
597 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
598 /* more work coming */
599 return 0;
600
601 if (is_thinint_irq(q->irq_ptr))
602 return 1;
603
604 /* don't poll under z/VM */
605 if (MACHINE_IS_VM)
606 return 1;
607
608 /*
609 * At this point we know, that inbound first_to_check
610 * has (probably) not moved (see qdio_inbound_processing).
611 */
612 if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
613 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
614 q->first_to_check);
615 return 1;
616 } else
617 return 0;
618 }
619
620 static inline int contains_aobs(struct qdio_q *q)
621 {
622 return !q->is_input_q && q->u.out.use_cq;
623 }
624
625 static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
626 int i, struct qaob *aob)
627 {
628 int tmp;
629
630 DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
631 (unsigned long) virt_to_phys(aob));
632 DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
633 (unsigned long) aob->res0[0]);
634 DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
635 (unsigned long) aob->res0[1]);
636 DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
637 (unsigned long) aob->res0[2]);
638 DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
639 (unsigned long) aob->res0[3]);
640 DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
641 (unsigned long) aob->res0[4]);
642 DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
643 (unsigned long) aob->res0[5]);
644 DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
645 DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
646 DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
647 DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
648 DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
649 DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
650 DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
651 for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
652 DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
653 (unsigned long) aob->sba[tmp]);
654 DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
655 (unsigned long) q->sbal[i]->element[tmp].addr);
656 DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
657 DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
658 q->sbal[i]->element[tmp].length);
659 }
660 DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
661 for (tmp = 0; tmp < 2; ++tmp) {
662 DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
663 (unsigned long) aob->res4[tmp]);
664 }
665 DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
666 DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
667 }
668
669 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
670 {
671 unsigned char state = 0;
672 int j, b = start;
673
674 if (!contains_aobs(q))
675 return;
676
677 for (j = 0; j < count; ++j) {
678 get_buf_state(q, b, &state, 0);
679 if (state == SLSB_P_OUTPUT_PENDING) {
680 struct qaob *aob = q->u.out.aobs[b];
681 if (aob == NULL)
682 continue;
683
684 BUG_ON(q->u.out.sbal_state == NULL);
685 q->u.out.sbal_state[b].flags |=
686 QDIO_OUTBUF_STATE_FLAG_PENDING;
687 q->u.out.aobs[b] = NULL;
688 } else if (state == SLSB_P_OUTPUT_EMPTY) {
689 BUG_ON(q->u.out.sbal_state == NULL);
690 q->u.out.sbal_state[b].aob = NULL;
691 }
692 b = next_buf(b);
693 }
694 }
695
696 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
697 int bufnr)
698 {
699 unsigned long phys_aob = 0;
700
701 if (!q->use_cq)
702 goto out;
703
704 if (!q->aobs[bufnr]) {
705 struct qaob *aob = qdio_allocate_aob();
706 q->aobs[bufnr] = aob;
707 }
708 if (q->aobs[bufnr]) {
709 BUG_ON(q->sbal_state == NULL);
710 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
711 q->sbal_state[bufnr].aob = q->aobs[bufnr];
712 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
713 phys_aob = virt_to_phys(q->aobs[bufnr]);
714 BUG_ON(phys_aob & 0xFF);
715 }
716
717 out:
718 return phys_aob;
719 }
720
721 static void qdio_kick_handler(struct qdio_q *q)
722 {
723 int start = q->first_to_kick;
724 int end = q->first_to_check;
725 int count;
726
727 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
728 return;
729
730 count = sub_buf(end, start);
731
732 if (q->is_input_q) {
733 qperf_inc(q, inbound_handler);
734 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
735 } else {
736 qperf_inc(q, outbound_handler);
737 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
738 start, count);
739 }
740
741 qdio_handle_aobs(q, start, count);
742
743 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
744 q->irq_ptr->int_parm);
745
746 /* for the next time */
747 q->first_to_kick = end;
748 q->qdio_error = 0;
749 }
750
751 static void __qdio_inbound_processing(struct qdio_q *q)
752 {
753 qperf_inc(q, tasklet_inbound);
754
755 if (!qdio_inbound_q_moved(q))
756 return;
757
758 qdio_kick_handler(q);
759
760 if (!qdio_inbound_q_done(q)) {
761 /* means poll time is not yet over */
762 qperf_inc(q, tasklet_inbound_resched);
763 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
764 tasklet_schedule(&q->tasklet);
765 return;
766 }
767 }
768
769 qdio_stop_polling(q);
770 /*
771 * We need to check again to not lose initiative after
772 * resetting the ACK state.
773 */
774 if (!qdio_inbound_q_done(q)) {
775 qperf_inc(q, tasklet_inbound_resched2);
776 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
777 tasklet_schedule(&q->tasklet);
778 }
779 }
780
781 void qdio_inbound_processing(unsigned long data)
782 {
783 struct qdio_q *q = (struct qdio_q *)data;
784 __qdio_inbound_processing(q);
785 }
786
787 static int get_outbound_buffer_frontier(struct qdio_q *q)
788 {
789 int count, stop;
790 unsigned char state = 0;
791
792 q->timestamp = get_clock_fast();
793
794 if (need_siga_sync(q))
795 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
796 !pci_out_supported(q)) ||
797 (queue_type(q) == QDIO_IQDIO_QFMT &&
798 multicast_outbound(q)))
799 qdio_siga_sync_q(q);
800
801 /*
802 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
803 * would return 0.
804 */
805 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
806 stop = add_buf(q->first_to_check, count);
807 if (q->first_to_check == stop)
808 goto out;
809
810 count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
811 if (!count)
812 goto out;
813
814 switch (state) {
815 case SLSB_P_OUTPUT_PENDING:
816 BUG();
817 case SLSB_P_OUTPUT_EMPTY:
818 /* the adapter got it */
819 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
820 "out empty:%1d %02x", q->nr, count);
821
822 atomic_sub(count, &q->nr_buf_used);
823 q->first_to_check = add_buf(q->first_to_check, count);
824 if (q->irq_ptr->perf_stat_enabled)
825 account_sbals(q, count);
826
827 break;
828 case SLSB_P_OUTPUT_ERROR:
829 process_buffer_error(q, count);
830 q->first_to_check = add_buf(q->first_to_check, count);
831 atomic_sub(count, &q->nr_buf_used);
832 if (q->irq_ptr->perf_stat_enabled)
833 account_sbals_error(q, count);
834 break;
835 case SLSB_CU_OUTPUT_PRIMED:
836 /* the adapter has not fetched the output yet */
837 if (q->irq_ptr->perf_stat_enabled)
838 q->q_stats.nr_sbal_nop++;
839 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
840 q->nr);
841 break;
842 case SLSB_P_OUTPUT_NOT_INIT:
843 case SLSB_P_OUTPUT_HALTED:
844 break;
845 default:
846 BUG();
847 }
848
849 out:
850 return q->first_to_check;
851 }
852
853 /* all buffers processed? */
854 static inline int qdio_outbound_q_done(struct qdio_q *q)
855 {
856 return atomic_read(&q->nr_buf_used) == 0;
857 }
858
859 static inline int qdio_outbound_q_moved(struct qdio_q *q)
860 {
861 int bufnr;
862
863 bufnr = get_outbound_buffer_frontier(q);
864
865 if ((bufnr != q->last_move) || q->qdio_error) {
866 q->last_move = bufnr;
867 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
868 return 1;
869 } else
870 return 0;
871 }
872
873 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
874 {
875 int retries = 0, cc;
876 unsigned int busy_bit;
877
878 if (!need_siga_out(q))
879 return 0;
880
881 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
882 retry:
883 qperf_inc(q, siga_write);
884
885 cc = qdio_siga_output(q, &busy_bit, aob);
886 switch (cc) {
887 case 0:
888 break;
889 case 2:
890 if (busy_bit) {
891 while (++retries < QDIO_BUSY_BIT_RETRIES) {
892 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
893 goto retry;
894 }
895 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
896 cc |= QDIO_ERROR_SIGA_BUSY;
897 } else
898 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
899 break;
900 case 1:
901 case 3:
902 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
903 break;
904 }
905 if (retries) {
906 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
907 DBF_ERROR("count:%u", retries);
908 }
909 return cc;
910 }
911
912 static void __qdio_outbound_processing(struct qdio_q *q)
913 {
914 qperf_inc(q, tasklet_outbound);
915 BUG_ON(atomic_read(&q->nr_buf_used) < 0);
916
917 if (qdio_outbound_q_moved(q))
918 qdio_kick_handler(q);
919
920 if (queue_type(q) == QDIO_ZFCP_QFMT)
921 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
922 goto sched;
923
924 if (q->u.out.pci_out_enabled)
925 return;
926
927 /*
928 * Now we know that queue type is either qeth without pci enabled
929 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
930 * is noticed and outbound_handler is called after some time.
931 */
932 if (qdio_outbound_q_done(q))
933 del_timer(&q->u.out.timer);
934 else
935 if (!timer_pending(&q->u.out.timer))
936 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
937 return;
938
939 sched:
940 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
941 return;
942 tasklet_schedule(&q->tasklet);
943 }
944
945 /* outbound tasklet */
946 void qdio_outbound_processing(unsigned long data)
947 {
948 struct qdio_q *q = (struct qdio_q *)data;
949 __qdio_outbound_processing(q);
950 }
951
952 void qdio_outbound_timer(unsigned long data)
953 {
954 struct qdio_q *q = (struct qdio_q *)data;
955
956 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
957 return;
958 tasklet_schedule(&q->tasklet);
959 }
960
961 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
962 {
963 struct qdio_q *out;
964 int i;
965
966 if (!pci_out_supported(q))
967 return;
968
969 for_each_output_queue(q->irq_ptr, out, i)
970 if (!qdio_outbound_q_done(out))
971 tasklet_schedule(&out->tasklet);
972 }
973
974 static void __tiqdio_inbound_processing(struct qdio_q *q)
975 {
976 qperf_inc(q, tasklet_inbound);
977 if (need_siga_sync(q) && need_siga_sync_after_ai(q))
978 qdio_sync_queues(q);
979
980 /*
981 * The interrupt could be caused by a PCI request. Check the
982 * PCI capable outbound queues.
983 */
984 qdio_check_outbound_after_thinint(q);
985
986 if (!qdio_inbound_q_moved(q))
987 return;
988
989 qdio_kick_handler(q);
990
991 if (!qdio_inbound_q_done(q)) {
992 qperf_inc(q, tasklet_inbound_resched);
993 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
994 tasklet_schedule(&q->tasklet);
995 return;
996 }
997 }
998
999 qdio_stop_polling(q);
1000 /*
1001 * We need to check again to not lose initiative after
1002 * resetting the ACK state.
1003 */
1004 if (!qdio_inbound_q_done(q)) {
1005 qperf_inc(q, tasklet_inbound_resched2);
1006 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
1007 tasklet_schedule(&q->tasklet);
1008 }
1009 }
1010
1011 void tiqdio_inbound_processing(unsigned long data)
1012 {
1013 struct qdio_q *q = (struct qdio_q *)data;
1014 __tiqdio_inbound_processing(q);
1015 }
1016
1017 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
1018 enum qdio_irq_states state)
1019 {
1020 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
1021
1022 irq_ptr->state = state;
1023 mb();
1024 }
1025
1026 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
1027 {
1028 if (irb->esw.esw0.erw.cons) {
1029 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
1030 DBF_ERROR_HEX(irb, 64);
1031 DBF_ERROR_HEX(irb->ecw, 64);
1032 }
1033 }
1034
1035 /* PCI interrupt handler */
1036 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
1037 {
1038 int i;
1039 struct qdio_q *q;
1040
1041 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
1042 return;
1043
1044 for_each_input_queue(irq_ptr, q, i) {
1045 if (q->u.in.queue_start_poll) {
1046 /* skip if polling is enabled or already in work */
1047 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1048 &q->u.in.queue_irq_state)) {
1049 qperf_inc(q, int_discarded);
1050 continue;
1051 }
1052 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
1053 q->irq_ptr->int_parm);
1054 } else {
1055 tasklet_schedule(&q->tasklet);
1056 }
1057 }
1058
1059 if (!pci_out_supported(q))
1060 return;
1061
1062 for_each_output_queue(irq_ptr, q, i) {
1063 if (qdio_outbound_q_done(q))
1064 continue;
1065 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1066 qdio_siga_sync_q(q);
1067 tasklet_schedule(&q->tasklet);
1068 }
1069 }
1070
1071 static void qdio_handle_activate_check(struct ccw_device *cdev,
1072 unsigned long intparm, int cstat, int dstat)
1073 {
1074 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1075 struct qdio_q *q;
1076 int count;
1077
1078 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1079 DBF_ERROR("intp :%lx", intparm);
1080 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1081
1082 if (irq_ptr->nr_input_qs) {
1083 q = irq_ptr->input_qs[0];
1084 } else if (irq_ptr->nr_output_qs) {
1085 q = irq_ptr->output_qs[0];
1086 } else {
1087 dump_stack();
1088 goto no_handler;
1089 }
1090
1091 count = sub_buf(q->first_to_check, q->first_to_kick);
1092 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
1093 q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1094 no_handler:
1095 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1096 }
1097
1098 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1099 int dstat)
1100 {
1101 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1102
1103 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1104
1105 if (cstat)
1106 goto error;
1107 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1108 goto error;
1109 if (!(dstat & DEV_STAT_DEV_END))
1110 goto error;
1111 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1112 return;
1113
1114 error:
1115 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1116 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1117 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1118 }
1119
1120 /* qdio interrupt handler */
1121 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1122 struct irb *irb)
1123 {
1124 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1125 int cstat, dstat;
1126
1127 if (!intparm || !irq_ptr) {
1128 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1129 return;
1130 }
1131
1132 if (irq_ptr->perf_stat_enabled)
1133 irq_ptr->perf_stat.qdio_int++;
1134
1135 if (IS_ERR(irb)) {
1136 switch (PTR_ERR(irb)) {
1137 case -EIO:
1138 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1139 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1140 wake_up(&cdev->private->wait_q);
1141 return;
1142 default:
1143 WARN_ON(1);
1144 return;
1145 }
1146 }
1147 qdio_irq_check_sense(irq_ptr, irb);
1148 cstat = irb->scsw.cmd.cstat;
1149 dstat = irb->scsw.cmd.dstat;
1150
1151 switch (irq_ptr->state) {
1152 case QDIO_IRQ_STATE_INACTIVE:
1153 qdio_establish_handle_irq(cdev, cstat, dstat);
1154 break;
1155 case QDIO_IRQ_STATE_CLEANUP:
1156 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1157 break;
1158 case QDIO_IRQ_STATE_ESTABLISHED:
1159 case QDIO_IRQ_STATE_ACTIVE:
1160 if (cstat & SCHN_STAT_PCI) {
1161 qdio_int_handler_pci(irq_ptr);
1162 return;
1163 }
1164 if (cstat || dstat)
1165 qdio_handle_activate_check(cdev, intparm, cstat,
1166 dstat);
1167 break;
1168 case QDIO_IRQ_STATE_STOPPED:
1169 break;
1170 default:
1171 WARN_ON(1);
1172 }
1173 wake_up(&cdev->private->wait_q);
1174 }
1175
1176 /**
1177 * qdio_get_ssqd_desc - get qdio subchannel description
1178 * @cdev: ccw device to get description for
1179 * @data: where to store the ssqd
1180 *
1181 * Returns 0 or an error code. The results of the chsc are stored in the
1182 * specified structure.
1183 */
1184 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1185 struct qdio_ssqd_desc *data)
1186 {
1187
1188 if (!cdev || !cdev->private)
1189 return -EINVAL;
1190
1191 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1192 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1193 }
1194 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1195
1196 static void qdio_shutdown_queues(struct ccw_device *cdev)
1197 {
1198 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1199 struct qdio_q *q;
1200 int i;
1201
1202 for_each_input_queue(irq_ptr, q, i)
1203 tasklet_kill(&q->tasklet);
1204
1205 for_each_output_queue(irq_ptr, q, i) {
1206 del_timer(&q->u.out.timer);
1207 tasklet_kill(&q->tasklet);
1208 }
1209 }
1210
1211 /**
1212 * qdio_shutdown - shut down a qdio subchannel
1213 * @cdev: associated ccw device
1214 * @how: use halt or clear to shutdown
1215 */
1216 int qdio_shutdown(struct ccw_device *cdev, int how)
1217 {
1218 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1219 int rc;
1220 unsigned long flags;
1221
1222 if (!irq_ptr)
1223 return -ENODEV;
1224
1225 BUG_ON(irqs_disabled());
1226 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1227
1228 mutex_lock(&irq_ptr->setup_mutex);
1229 /*
1230 * Subchannel was already shot down. We cannot prevent being called
1231 * twice since cio may trigger a shutdown asynchronously.
1232 */
1233 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1234 mutex_unlock(&irq_ptr->setup_mutex);
1235 return 0;
1236 }
1237
1238 /*
1239 * Indicate that the device is going down. Scheduling the queue
1240 * tasklets is forbidden from here on.
1241 */
1242 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1243
1244 tiqdio_remove_input_queues(irq_ptr);
1245 qdio_shutdown_queues(cdev);
1246 qdio_shutdown_debug_entries(irq_ptr, cdev);
1247
1248 /* cleanup subchannel */
1249 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1250
1251 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1252 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1253 else
1254 /* default behaviour is halt */
1255 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1256 if (rc) {
1257 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1258 DBF_ERROR("rc:%4d", rc);
1259 goto no_cleanup;
1260 }
1261
1262 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1263 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1264 wait_event_interruptible_timeout(cdev->private->wait_q,
1265 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1266 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1267 10 * HZ);
1268 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1269
1270 no_cleanup:
1271 qdio_shutdown_thinint(irq_ptr);
1272
1273 /* restore interrupt handler */
1274 if ((void *)cdev->handler == (void *)qdio_int_handler)
1275 cdev->handler = irq_ptr->orig_handler;
1276 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1277
1278 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1279 mutex_unlock(&irq_ptr->setup_mutex);
1280 if (rc)
1281 return rc;
1282 return 0;
1283 }
1284 EXPORT_SYMBOL_GPL(qdio_shutdown);
1285
1286 /**
1287 * qdio_free - free data structures for a qdio subchannel
1288 * @cdev: associated ccw device
1289 */
1290 int qdio_free(struct ccw_device *cdev)
1291 {
1292 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1293
1294 if (!irq_ptr)
1295 return -ENODEV;
1296
1297 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1298 mutex_lock(&irq_ptr->setup_mutex);
1299
1300 if (irq_ptr->debug_area != NULL) {
1301 debug_unregister(irq_ptr->debug_area);
1302 irq_ptr->debug_area = NULL;
1303 }
1304 cdev->private->qdio_data = NULL;
1305 mutex_unlock(&irq_ptr->setup_mutex);
1306
1307 qdio_release_memory(irq_ptr);
1308 return 0;
1309 }
1310 EXPORT_SYMBOL_GPL(qdio_free);
1311
1312 /**
1313 * qdio_allocate - allocate qdio queues and associated data
1314 * @init_data: initialization data
1315 */
1316 int qdio_allocate(struct qdio_initialize *init_data)
1317 {
1318 struct qdio_irq *irq_ptr;
1319
1320 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1321
1322 if ((init_data->no_input_qs && !init_data->input_handler) ||
1323 (init_data->no_output_qs && !init_data->output_handler))
1324 return -EINVAL;
1325
1326 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1327 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1328 return -EINVAL;
1329
1330 if ((!init_data->input_sbal_addr_array) ||
1331 (!init_data->output_sbal_addr_array))
1332 return -EINVAL;
1333
1334 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1335 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1336 if (!irq_ptr)
1337 goto out_err;
1338
1339 mutex_init(&irq_ptr->setup_mutex);
1340 qdio_allocate_dbf(init_data, irq_ptr);
1341
1342 /*
1343 * Allocate a page for the chsc calls in qdio_establish.
1344 * Must be pre-allocated since a zfcp recovery will call
1345 * qdio_establish. In case of low memory and swap on a zfcp disk
1346 * we may not be able to allocate memory otherwise.
1347 */
1348 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1349 if (!irq_ptr->chsc_page)
1350 goto out_rel;
1351
1352 /* qdr is used in ccw1.cda which is u32 */
1353 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1354 if (!irq_ptr->qdr)
1355 goto out_rel;
1356 WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1357
1358 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1359 init_data->no_output_qs))
1360 goto out_rel;
1361
1362 init_data->cdev->private->qdio_data = irq_ptr;
1363 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1364 return 0;
1365 out_rel:
1366 qdio_release_memory(irq_ptr);
1367 out_err:
1368 return -ENOMEM;
1369 }
1370 EXPORT_SYMBOL_GPL(qdio_allocate);
1371
1372 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1373 {
1374 struct qdio_q *q = irq_ptr->input_qs[0];
1375 int i, use_cq = 0;
1376
1377 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1378 use_cq = 1;
1379
1380 for_each_output_queue(irq_ptr, q, i) {
1381 if (use_cq) {
1382 if (qdio_enable_async_operation(&q->u.out) < 0) {
1383 use_cq = 0;
1384 continue;
1385 }
1386 } else
1387 qdio_disable_async_operation(&q->u.out);
1388 }
1389 DBF_EVENT("use_cq:%d", use_cq);
1390 }
1391
1392 /**
1393 * qdio_establish - establish queues on a qdio subchannel
1394 * @init_data: initialization data
1395 */
1396 int qdio_establish(struct qdio_initialize *init_data)
1397 {
1398 struct qdio_irq *irq_ptr;
1399 struct ccw_device *cdev = init_data->cdev;
1400 unsigned long saveflags;
1401 int rc;
1402
1403 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1404
1405 irq_ptr = cdev->private->qdio_data;
1406 if (!irq_ptr)
1407 return -ENODEV;
1408
1409 if (cdev->private->state != DEV_STATE_ONLINE)
1410 return -EINVAL;
1411
1412 mutex_lock(&irq_ptr->setup_mutex);
1413 qdio_setup_irq(init_data);
1414
1415 rc = qdio_establish_thinint(irq_ptr);
1416 if (rc) {
1417 mutex_unlock(&irq_ptr->setup_mutex);
1418 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1419 return rc;
1420 }
1421
1422 /* establish q */
1423 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1424 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1425 irq_ptr->ccw.count = irq_ptr->equeue.count;
1426 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1427
1428 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1429 ccw_device_set_options_mask(cdev, 0);
1430
1431 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1432 if (rc) {
1433 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1434 DBF_ERROR("rc:%4x", rc);
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 DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1456
1457 qdio_detect_hsicq(irq_ptr);
1458
1459 /* qebsm is now setup if available, initialize buffer states */
1460 qdio_init_buf_states(irq_ptr);
1461
1462 mutex_unlock(&irq_ptr->setup_mutex);
1463 qdio_print_subchannel_info(irq_ptr, cdev);
1464 qdio_setup_debug_entries(irq_ptr, cdev);
1465 return 0;
1466 }
1467 EXPORT_SYMBOL_GPL(qdio_establish);
1468
1469 /**
1470 * qdio_activate - activate queues on a qdio subchannel
1471 * @cdev: associated cdev
1472 */
1473 int qdio_activate(struct ccw_device *cdev)
1474 {
1475 struct qdio_irq *irq_ptr;
1476 int rc;
1477 unsigned long saveflags;
1478
1479 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1480
1481 irq_ptr = cdev->private->qdio_data;
1482 if (!irq_ptr)
1483 return -ENODEV;
1484
1485 if (cdev->private->state != DEV_STATE_ONLINE)
1486 return -EINVAL;
1487
1488 mutex_lock(&irq_ptr->setup_mutex);
1489 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1490 rc = -EBUSY;
1491 goto out;
1492 }
1493
1494 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1495 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1496 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1497 irq_ptr->ccw.cda = 0;
1498
1499 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1500 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1501
1502 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1503 0, DOIO_DENY_PREFETCH);
1504 if (rc) {
1505 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1506 DBF_ERROR("rc:%4x", rc);
1507 }
1508 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1509
1510 if (rc)
1511 goto out;
1512
1513 if (is_thinint_irq(irq_ptr))
1514 tiqdio_add_input_queues(irq_ptr);
1515
1516 /* wait for subchannel to become active */
1517 msleep(5);
1518
1519 switch (irq_ptr->state) {
1520 case QDIO_IRQ_STATE_STOPPED:
1521 case QDIO_IRQ_STATE_ERR:
1522 rc = -EIO;
1523 break;
1524 default:
1525 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1526 rc = 0;
1527 }
1528 out:
1529 mutex_unlock(&irq_ptr->setup_mutex);
1530 return rc;
1531 }
1532 EXPORT_SYMBOL_GPL(qdio_activate);
1533
1534 static inline int buf_in_between(int bufnr, int start, int count)
1535 {
1536 int end = add_buf(start, count);
1537
1538 if (end > start) {
1539 if (bufnr >= start && bufnr < end)
1540 return 1;
1541 else
1542 return 0;
1543 }
1544
1545 /* wrap-around case */
1546 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1547 (bufnr < end))
1548 return 1;
1549 else
1550 return 0;
1551 }
1552
1553 /**
1554 * handle_inbound - reset processed input buffers
1555 * @q: queue containing the buffers
1556 * @callflags: flags
1557 * @bufnr: first buffer to process
1558 * @count: how many buffers are emptied
1559 */
1560 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1561 int bufnr, int count)
1562 {
1563 int used, diff;
1564
1565 qperf_inc(q, inbound_call);
1566
1567 if (!q->u.in.polling)
1568 goto set;
1569
1570 /* protect against stop polling setting an ACK for an emptied slsb */
1571 if (count == QDIO_MAX_BUFFERS_PER_Q) {
1572 /* overwriting everything, just delete polling status */
1573 q->u.in.polling = 0;
1574 q->u.in.ack_count = 0;
1575 goto set;
1576 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1577 if (is_qebsm(q)) {
1578 /* partial overwrite, just update ack_start */
1579 diff = add_buf(bufnr, count);
1580 diff = sub_buf(diff, q->u.in.ack_start);
1581 q->u.in.ack_count -= diff;
1582 if (q->u.in.ack_count <= 0) {
1583 q->u.in.polling = 0;
1584 q->u.in.ack_count = 0;
1585 goto set;
1586 }
1587 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1588 }
1589 else
1590 /* the only ACK will be deleted, so stop polling */
1591 q->u.in.polling = 0;
1592 }
1593
1594 set:
1595 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1596
1597 used = atomic_add_return(count, &q->nr_buf_used) - count;
1598 BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1599
1600 if (need_siga_in(q))
1601 return qdio_siga_input(q);
1602
1603 return 0;
1604 }
1605
1606 /**
1607 * handle_outbound - process filled outbound buffers
1608 * @q: queue containing the buffers
1609 * @callflags: flags
1610 * @bufnr: first buffer to process
1611 * @count: how many buffers are filled
1612 */
1613 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1614 int bufnr, int count)
1615 {
1616 unsigned char state = 0;
1617 int used, rc = 0;
1618
1619 qperf_inc(q, outbound_call);
1620
1621 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1622 used = atomic_add_return(count, &q->nr_buf_used);
1623 BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1624
1625 if (used == QDIO_MAX_BUFFERS_PER_Q)
1626 qperf_inc(q, outbound_queue_full);
1627
1628 if (callflags & QDIO_FLAG_PCI_OUT) {
1629 q->u.out.pci_out_enabled = 1;
1630 qperf_inc(q, pci_request_int);
1631 } else
1632 q->u.out.pci_out_enabled = 0;
1633
1634 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1635 unsigned long phys_aob = 0;
1636
1637 /* One SIGA-W per buffer required for unicast HSI */
1638 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1639
1640 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1641
1642 rc = qdio_kick_outbound_q(q, phys_aob);
1643 } else if (need_siga_sync(q)) {
1644 rc = qdio_siga_sync_q(q);
1645 } else {
1646 /* try to fast requeue buffers */
1647 get_buf_state(q, prev_buf(bufnr), &state, 0);
1648 if (state != SLSB_CU_OUTPUT_PRIMED)
1649 rc = qdio_kick_outbound_q(q, 0);
1650 else
1651 qperf_inc(q, fast_requeue);
1652 }
1653
1654 /* in case of SIGA errors we must process the error immediately */
1655 if (used >= q->u.out.scan_threshold || rc)
1656 tasklet_schedule(&q->tasklet);
1657 else
1658 /* free the SBALs in case of no further traffic */
1659 if (!timer_pending(&q->u.out.timer))
1660 mod_timer(&q->u.out.timer, jiffies + HZ);
1661 return rc;
1662 }
1663
1664 /**
1665 * do_QDIO - process input or output buffers
1666 * @cdev: associated ccw_device for the qdio subchannel
1667 * @callflags: input or output and special flags from the program
1668 * @q_nr: queue number
1669 * @bufnr: buffer number
1670 * @count: how many buffers to process
1671 */
1672 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1673 int q_nr, unsigned int bufnr, unsigned int count)
1674 {
1675 struct qdio_irq *irq_ptr;
1676
1677
1678 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1679 return -EINVAL;
1680
1681 irq_ptr = cdev->private->qdio_data;
1682 if (!irq_ptr)
1683 return -ENODEV;
1684
1685 DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1686 "do%02x b:%02x c:%02x", callflags, bufnr, count);
1687
1688 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1689 return -EBUSY;
1690 if (!count)
1691 return 0;
1692 if (callflags & QDIO_FLAG_SYNC_INPUT)
1693 return handle_inbound(irq_ptr->input_qs[q_nr],
1694 callflags, bufnr, count);
1695 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1696 return handle_outbound(irq_ptr->output_qs[q_nr],
1697 callflags, bufnr, count);
1698 return -EINVAL;
1699 }
1700 EXPORT_SYMBOL_GPL(do_QDIO);
1701
1702 /**
1703 * qdio_start_irq - process input buffers
1704 * @cdev: associated ccw_device for the qdio subchannel
1705 * @nr: input queue number
1706 *
1707 * Return codes
1708 * 0 - success
1709 * 1 - irqs not started since new data is available
1710 */
1711 int qdio_start_irq(struct ccw_device *cdev, int nr)
1712 {
1713 struct qdio_q *q;
1714 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1715
1716 if (!irq_ptr)
1717 return -ENODEV;
1718 q = irq_ptr->input_qs[nr];
1719
1720 WARN_ON(queue_irqs_enabled(q));
1721
1722 clear_nonshared_ind(irq_ptr);
1723 qdio_stop_polling(q);
1724 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1725
1726 /*
1727 * We need to check again to not lose initiative after
1728 * resetting the ACK state.
1729 */
1730 if (test_nonshared_ind(irq_ptr))
1731 goto rescan;
1732 if (!qdio_inbound_q_done(q))
1733 goto rescan;
1734 return 0;
1735
1736 rescan:
1737 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1738 &q->u.in.queue_irq_state))
1739 return 0;
1740 else
1741 return 1;
1742
1743 }
1744 EXPORT_SYMBOL(qdio_start_irq);
1745
1746 /**
1747 * qdio_get_next_buffers - process input buffers
1748 * @cdev: associated ccw_device for the qdio subchannel
1749 * @nr: input queue number
1750 * @bufnr: first filled buffer number
1751 * @error: buffers are in error state
1752 *
1753 * Return codes
1754 * < 0 - error
1755 * = 0 - no new buffers found
1756 * > 0 - number of processed buffers
1757 */
1758 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1759 int *error)
1760 {
1761 struct qdio_q *q;
1762 int start, end;
1763 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1764
1765 if (!irq_ptr)
1766 return -ENODEV;
1767 q = irq_ptr->input_qs[nr];
1768 WARN_ON(queue_irqs_enabled(q));
1769
1770 /*
1771 * Cannot rely on automatic sync after interrupt since queues may
1772 * also be examined without interrupt.
1773 */
1774 if (need_siga_sync(q))
1775 qdio_sync_queues(q);
1776
1777 /* check the PCI capable outbound queues. */
1778 qdio_check_outbound_after_thinint(q);
1779
1780 if (!qdio_inbound_q_moved(q))
1781 return 0;
1782
1783 /* Note: upper-layer MUST stop processing immediately here ... */
1784 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1785 return -EIO;
1786
1787 start = q->first_to_kick;
1788 end = q->first_to_check;
1789 *bufnr = start;
1790 *error = q->qdio_error;
1791
1792 /* for the next time */
1793 q->first_to_kick = end;
1794 q->qdio_error = 0;
1795 return sub_buf(end, start);
1796 }
1797 EXPORT_SYMBOL(qdio_get_next_buffers);
1798
1799 /**
1800 * qdio_stop_irq - disable interrupt processing for the device
1801 * @cdev: associated ccw_device for the qdio subchannel
1802 * @nr: input queue number
1803 *
1804 * Return codes
1805 * 0 - interrupts were already disabled
1806 * 1 - interrupts successfully disabled
1807 */
1808 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1809 {
1810 struct qdio_q *q;
1811 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1812
1813 if (!irq_ptr)
1814 return -ENODEV;
1815 q = irq_ptr->input_qs[nr];
1816
1817 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1818 &q->u.in.queue_irq_state))
1819 return 0;
1820 else
1821 return 1;
1822 }
1823 EXPORT_SYMBOL(qdio_stop_irq);
1824
1825 static int __init init_QDIO(void)
1826 {
1827 int rc;
1828
1829 rc = qdio_debug_init();
1830 if (rc)
1831 return rc;
1832 rc = qdio_setup_init();
1833 if (rc)
1834 goto out_debug;
1835 rc = tiqdio_allocate_memory();
1836 if (rc)
1837 goto out_cache;
1838 rc = tiqdio_register_thinints();
1839 if (rc)
1840 goto out_ti;
1841 return 0;
1842
1843 out_ti:
1844 tiqdio_free_memory();
1845 out_cache:
1846 qdio_setup_exit();
1847 out_debug:
1848 qdio_debug_exit();
1849 return rc;
1850 }
1851
1852 static void __exit exit_QDIO(void)
1853 {
1854 tiqdio_unregister_thinints();
1855 tiqdio_free_memory();
1856 qdio_setup_exit();
1857 qdio_debug_exit();
1858 }
1859
1860 module_init(init_QDIO);
1861 module_exit(exit_QDIO);
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