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