1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Linux for s390 qdio support, buffer handling, qdio API and module support.
4 *
5 * Copyright IBM Corp. 2000, 2008
6 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
7 * Jan Glauber <jang@linux.vnet.ibm.com>
8 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
9 */
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/kmemleak.h>
14#include <linux/delay.h>
15#include <linux/gfp.h>
16#include <linux/io.h>
17#include <linux/atomic.h>
18#include <asm/debug.h>
19#include <asm/qdio.h>
20#include <asm/ipl.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 long out_mask, unsigned long in_mask,
35 unsigned int fc)
36{
37 int cc;
38
39 asm volatile(
40 " lgr 0,%[fc]\n"
41 " lgr 1,%[schid]\n"
42 " lgr 2,%[out]\n"
43 " lgr 3,%[in]\n"
44 " siga 0\n"
45 " ipm %[cc]\n"
46 " srl %[cc],28\n"
47 : [cc] "=&d" (cc)
48 : [fc] "d" (fc), [schid] "d" (schid),
49 [out] "d" (out_mask), [in] "d" (in_mask)
50 : "cc", "0", "1", "2", "3");
51 return cc;
52}
53
54static inline int do_siga_input(unsigned long schid, unsigned long mask,
55 unsigned long fc)
56{
57 int cc;
58
59 asm volatile(
60 " lgr 0,%[fc]\n"
61 " lgr 1,%[schid]\n"
62 " lgr 2,%[mask]\n"
63 " siga 0\n"
64 " ipm %[cc]\n"
65 " srl %[cc],28\n"
66 : [cc] "=&d" (cc)
67 : [fc] "d" (fc), [schid] "d" (schid), [mask] "d" (mask)
68 : "cc", "0", "1", "2");
69 return cc;
70}
71
72/**
73 * do_siga_output - perform SIGA-w/wt function
74 * @schid: subchannel id or in case of QEBSM the subchannel token
75 * @mask: which output queues to process
76 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
77 * @fc: function code to perform
78 * @aob: asynchronous operation block
79 *
80 * Returns condition code.
81 * Note: For IQDC unicast queues only the highest priority queue is processed.
82 */
83static inline int do_siga_output(unsigned long schid, unsigned long mask,
84 unsigned int *bb, unsigned long fc,
85 unsigned long aob)
86{
87 int cc;
88
89 asm volatile(
90 " lgr 0,%[fc]\n"
91 " lgr 1,%[schid]\n"
92 " lgr 2,%[mask]\n"
93 " lgr 3,%[aob]\n"
94 " siga 0\n"
95 " lgr %[fc],0\n"
96 " ipm %[cc]\n"
97 " srl %[cc],28\n"
98 : [cc] "=&d" (cc), [fc] "+&d" (fc)
99 : [schid] "d" (schid), [mask] "d" (mask), [aob] "d" (aob)
100 : "cc", "0", "1", "2", "3");
101 *bb = fc >> 31;
102 return cc;
103}
104
105/**
106 * qdio_do_eqbs - extract buffer states for QEBSM
107 * @q: queue to manipulate
108 * @state: state of the extracted buffers
109 * @start: buffer number to start at
110 * @count: count of buffers to examine
111 * @auto_ack: automatically acknowledge buffers
112 *
113 * Returns the number of successfully extracted equal buffer states.
114 * Stops processing if a state is different from the last buffers state.
115 */
116static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
117 int start, int count, int auto_ack)
118{
119 int tmp_count = count, tmp_start = start, nr = q->nr;
120 unsigned int ccq = 0;
121
122 qperf_inc(q, eqbs);
123
124 if (!q->is_input_q)
125 nr += q->irq_ptr->nr_input_qs;
126again:
127 ccq = do_eqbs(token: q->irq_ptr->sch_token, state, queue: nr, start: &tmp_start, count: &tmp_count,
128 ack: auto_ack);
129
130 switch (ccq) {
131 case 0:
132 case 32:
133 /* all done, or next buffer state different */
134 return count - tmp_count;
135 case 96:
136 /* not all buffers processed */
137 qperf_inc(q, eqbs_partial);
138 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "EQBS part:%02x",
139 tmp_count);
140 return count - tmp_count;
141 case 97:
142 /* no buffer processed */
143 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
144 goto again;
145 default:
146 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
147 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
148 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
149 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr,
150 q->first_to_check, count, q->irq_ptr->int_parm);
151 return 0;
152 }
153}
154
155/**
156 * qdio_do_sqbs - set buffer states for QEBSM
157 * @q: queue to manipulate
158 * @state: new state of the buffers
159 * @start: first buffer number to change
160 * @count: how many buffers to change
161 *
162 * Returns the number of successfully changed buffers.
163 * Does retrying until the specified count of buffer states is set or an
164 * error occurs.
165 */
166static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
167 int count)
168{
169 unsigned int ccq = 0;
170 int tmp_count = count, tmp_start = start;
171 int nr = q->nr;
172
173 qperf_inc(q, sqbs);
174
175 if (!q->is_input_q)
176 nr += q->irq_ptr->nr_input_qs;
177again:
178 ccq = do_sqbs(token: q->irq_ptr->sch_token, state, queue: nr, start: &tmp_start, count: &tmp_count);
179
180 switch (ccq) {
181 case 0:
182 case 32:
183 /* all done, or active buffer adapter-owned */
184 WARN_ON_ONCE(tmp_count);
185 return count - tmp_count;
186 case 96:
187 /* not all buffers processed */
188 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
189 qperf_inc(q, sqbs_partial);
190 goto again;
191 default:
192 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
193 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
194 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
195 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr,
196 q->first_to_check, count, q->irq_ptr->int_parm);
197 return 0;
198 }
199}
200
201/*
202 * Returns number of examined buffers and their common state in *state.
203 * Requested number of buffers-to-examine must be > 0.
204 */
205static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
206 unsigned char *state, unsigned int count,
207 int auto_ack)
208{
209 unsigned char __state = 0;
210 int i = 1;
211
212 if (is_qebsm(q))
213 return qdio_do_eqbs(q, state, start: bufnr, count, auto_ack);
214
215 /* get initial state: */
216 __state = q->slsb.val[bufnr];
217
218 /* Bail out early if there is no work on the queue: */
219 if (__state & SLSB_OWNER_CU)
220 goto out;
221
222 for (; i < count; i++) {
223 bufnr = next_buf(bufnr);
224
225 /* stop if next state differs from initial state: */
226 if (q->slsb.val[bufnr] != __state)
227 break;
228 }
229
230out:
231 *state = __state;
232 return i;
233}
234
235static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
236 unsigned char *state, int auto_ack)
237{
238 return get_buf_states(q, bufnr, state, count: 1, auto_ack);
239}
240
241/* wrap-around safe setting of slsb states, returns number of changed buffers */
242static inline int set_buf_states(struct qdio_q *q, int bufnr,
243 unsigned char state, int count)
244{
245 int i;
246
247 if (is_qebsm(q))
248 return qdio_do_sqbs(q, state, start: bufnr, count);
249
250 /* Ensure that all preceding changes to the SBALs are visible: */
251 mb();
252
253 for (i = 0; i < count; i++) {
254 WRITE_ONCE(q->slsb.val[bufnr], state);
255 bufnr = next_buf(bufnr);
256 }
257
258 /* Make our SLSB changes visible: */
259 mb();
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, count: 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, bufnr: 0, SLSB_P_INPUT_NOT_INIT,
278 count: QDIO_MAX_BUFFERS_PER_Q);
279 for_each_output_queue(irq_ptr, q, i)
280 set_buf_states(q, bufnr: 0, SLSB_P_OUTPUT_NOT_INIT,
281 count: 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, out_mask: output, in_mask: 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_sync_input_queue(struct qdio_q *q)
306{
307 return qdio_siga_sync(q, output: 0, input: q->mask);
308}
309
310static inline int qdio_sync_output_queue(struct qdio_q *q)
311{
312 return qdio_siga_sync(q, output: q->mask, input: 0);
313}
314
315static inline int qdio_siga_sync_q(struct qdio_q *q)
316{
317 if (q->is_input_q)
318 return qdio_sync_input_queue(q);
319 else
320 return qdio_sync_output_queue(q);
321}
322
323static int qdio_siga_output(struct qdio_q *q, unsigned int count,
324 unsigned int *busy_bit, unsigned long aob)
325{
326 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
327 unsigned int fc = QDIO_SIGA_WRITE;
328 u64 start_time = 0;
329 int retries = 0, cc;
330
331 if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
332 if (count > 1)
333 fc = QDIO_SIGA_WRITEM;
334 else if (aob)
335 fc = QDIO_SIGA_WRITEQ;
336 }
337
338 if (is_qebsm(q)) {
339 schid = q->irq_ptr->sch_token;
340 fc |= QDIO_SIGA_QEBSM_FLAG;
341 }
342again:
343 cc = do_siga_output(schid, mask: q->mask, bb: busy_bit, fc, aob);
344
345 /* hipersocket busy condition */
346 if (unlikely(*busy_bit)) {
347 retries++;
348
349 if (!start_time) {
350 start_time = get_tod_clock_fast();
351 goto again;
352 }
353 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
354 goto again;
355 }
356 if (retries) {
357 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
358 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
359 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
360 }
361 return cc;
362}
363
364static inline int qdio_siga_input(struct qdio_q *q)
365{
366 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
367 unsigned int fc = QDIO_SIGA_READ;
368 int cc;
369
370 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
371 qperf_inc(q, siga_read);
372
373 if (is_qebsm(q)) {
374 schid = q->irq_ptr->sch_token;
375 fc |= QDIO_SIGA_QEBSM_FLAG;
376 }
377
378 cc = do_siga_input(schid, mask: q->mask, fc);
379 if (unlikely(cc))
380 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
381 return (cc) ? -EIO : 0;
382}
383
384int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
385 unsigned char *state)
386{
387 if (qdio_need_siga_sync(q->irq_ptr))
388 qdio_siga_sync_q(q);
389 return get_buf_state(q, bufnr, state, auto_ack: 0);
390}
391
392static inline void qdio_stop_polling(struct qdio_q *q)
393{
394 if (!q->u.in.batch_count)
395 return;
396
397 qperf_inc(q, stop_polling);
398
399 /* show the card that we are not polling anymore */
400 set_buf_states(q, bufnr: q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT,
401 count: q->u.in.batch_count);
402 q->u.in.batch_count = 0;
403}
404
405static inline void account_sbals(struct qdio_q *q, unsigned int count)
406{
407 q->q_stats.nr_sbal_total += count;
408 q->q_stats.nr_sbals[ilog2(count)]++;
409}
410
411static void process_buffer_error(struct qdio_q *q, unsigned int start,
412 int count)
413{
414 /* special handling for no target buffer empty */
415 if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
416 q->sbal[start]->element[15].sflags == 0x10) {
417 qperf_inc(q, target_full);
418 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
419 return;
420 }
421
422 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
423 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
424 DBF_ERROR("FTC:%3d C:%3d", start, count);
425 DBF_ERROR("F14:%2x F15:%2x",
426 q->sbal[start]->element[14].sflags,
427 q->sbal[start]->element[15].sflags);
428}
429
430static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
431 int count, bool auto_ack)
432{
433 /* ACK the newest SBAL: */
434 if (!auto_ack)
435 set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK);
436
437 if (!q->u.in.batch_count)
438 q->u.in.batch_start = start;
439 q->u.in.batch_count += count;
440}
441
442static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start,
443 unsigned int *error)
444{
445 unsigned char state = 0;
446 int count;
447
448 q->timestamp = get_tod_clock_fast();
449
450 count = atomic_read(v: &q->nr_buf_used);
451 if (!count)
452 return 0;
453
454 if (qdio_need_siga_sync(q->irq_ptr))
455 qdio_sync_input_queue(q);
456
457 count = get_buf_states(q, bufnr: start, state: &state, count, auto_ack: 1);
458 if (!count)
459 return 0;
460
461 switch (state) {
462 case SLSB_P_INPUT_PRIMED:
463 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
464 count);
465
466 inbound_handle_work(q, start, count, is_qebsm(q));
467 if (atomic_sub_return(i: count, v: &q->nr_buf_used) == 0)
468 qperf_inc(q, inbound_queue_full);
469 if (q->irq_ptr->perf_stat_enabled)
470 account_sbals(q, count);
471 return count;
472 case SLSB_P_INPUT_ERROR:
473 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
474 count);
475
476 *error = QDIO_ERROR_SLSB_STATE;
477 process_buffer_error(q, start, count);
478 inbound_handle_work(q, start, count, auto_ack: false);
479 if (atomic_sub_return(i: count, v: &q->nr_buf_used) == 0)
480 qperf_inc(q, inbound_queue_full);
481 if (q->irq_ptr->perf_stat_enabled)
482 account_sbals_error(q, count);
483 return count;
484 case SLSB_CU_INPUT_EMPTY:
485 if (q->irq_ptr->perf_stat_enabled)
486 q->q_stats.nr_sbal_nop++;
487 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
488 q->nr, start);
489 return 0;
490 case SLSB_P_INPUT_NOT_INIT:
491 case SLSB_P_INPUT_ACK:
492 /* We should never see this state, throw a WARN: */
493 default:
494 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
495 "found state %#x at index %u on queue %u\n",
496 state, start, q->nr);
497 return 0;
498 }
499}
500
501int qdio_inspect_input_queue(struct ccw_device *cdev, unsigned int nr,
502 unsigned int *bufnr, unsigned int *error)
503{
504 struct qdio_irq *irq = cdev->private->qdio_data;
505 unsigned int start;
506 struct qdio_q *q;
507 int count;
508
509 if (!irq)
510 return -ENODEV;
511
512 q = irq->input_qs[nr];
513 start = q->first_to_check;
514 *error = 0;
515
516 count = get_inbound_buffer_frontier(q, start, error);
517 if (count == 0)
518 return 0;
519
520 *bufnr = start;
521 q->first_to_check = add_buf(start, count);
522 return count;
523}
524EXPORT_SYMBOL_GPL(qdio_inspect_input_queue);
525
526static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
527{
528 unsigned char state = 0;
529
530 if (!atomic_read(v: &q->nr_buf_used))
531 return 1;
532
533 if (qdio_need_siga_sync(q->irq_ptr))
534 qdio_sync_input_queue(q);
535 get_buf_state(q, bufnr: start, state: &state, auto_ack: 0);
536
537 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
538 /* more work coming */
539 return 0;
540
541 return 1;
542}
543
544static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start,
545 unsigned int *error)
546{
547 unsigned char state = 0;
548 int count;
549
550 q->timestamp = get_tod_clock_fast();
551
552 count = atomic_read(v: &q->nr_buf_used);
553 if (!count)
554 return 0;
555
556 if (qdio_need_siga_sync(q->irq_ptr))
557 qdio_sync_output_queue(q);
558
559 count = get_buf_states(q, bufnr: start, state: &state, count, auto_ack: 0);
560 if (!count)
561 return 0;
562
563 switch (state) {
564 case SLSB_P_OUTPUT_PENDING:
565 *error = QDIO_ERROR_SLSB_PENDING;
566 fallthrough;
567 case SLSB_P_OUTPUT_EMPTY:
568 /* the adapter got it */
569 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
570 "out empty:%1d %02x", q->nr, count);
571
572 atomic_sub(i: count, v: &q->nr_buf_used);
573 if (q->irq_ptr->perf_stat_enabled)
574 account_sbals(q, count);
575 return count;
576 case SLSB_P_OUTPUT_ERROR:
577 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out error:%1d %02x",
578 q->nr, count);
579
580 *error = QDIO_ERROR_SLSB_STATE;
581 process_buffer_error(q, start, count);
582 atomic_sub(i: count, v: &q->nr_buf_used);
583 if (q->irq_ptr->perf_stat_enabled)
584 account_sbals_error(q, count);
585 return count;
586 case SLSB_CU_OUTPUT_PRIMED:
587 /* the adapter has not fetched the output yet */
588 if (q->irq_ptr->perf_stat_enabled)
589 q->q_stats.nr_sbal_nop++;
590 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
591 q->nr);
592 return 0;
593 case SLSB_P_OUTPUT_HALTED:
594 return 0;
595 case SLSB_P_OUTPUT_NOT_INIT:
596 /* We should never see this state, throw a WARN: */
597 default:
598 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
599 "found state %#x at index %u on queue %u\n",
600 state, start, q->nr);
601 return 0;
602 }
603}
604
605int qdio_inspect_output_queue(struct ccw_device *cdev, unsigned int nr,
606 unsigned int *bufnr, unsigned int *error)
607{
608 struct qdio_irq *irq = cdev->private->qdio_data;
609 unsigned int start;
610 struct qdio_q *q;
611 int count;
612
613 if (!irq)
614 return -ENODEV;
615
616 q = irq->output_qs[nr];
617 start = q->first_to_check;
618 *error = 0;
619
620 count = get_outbound_buffer_frontier(q, start, error);
621 if (count == 0)
622 return 0;
623
624 *bufnr = start;
625 q->first_to_check = add_buf(start, count);
626 return count;
627}
628EXPORT_SYMBOL_GPL(qdio_inspect_output_queue);
629
630static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
631 unsigned long aob)
632{
633 int retries = 0, cc;
634 unsigned int busy_bit;
635
636 if (!qdio_need_siga_out(q->irq_ptr))
637 return 0;
638
639 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
640retry:
641 qperf_inc(q, siga_write);
642
643 cc = qdio_siga_output(q, count, busy_bit: &busy_bit, aob);
644 switch (cc) {
645 case 0:
646 break;
647 case 2:
648 if (busy_bit) {
649 while (++retries < QDIO_BUSY_BIT_RETRIES) {
650 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
651 goto retry;
652 }
653 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
654 cc = -EBUSY;
655 } else {
656 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
657 cc = -ENOBUFS;
658 }
659 break;
660 case 1:
661 case 3:
662 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
663 cc = -EIO;
664 break;
665 }
666 if (retries) {
667 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
668 DBF_ERROR("count:%u", retries);
669 }
670 return cc;
671}
672
673static inline void qdio_set_state(struct qdio_irq *irq_ptr,
674 enum qdio_irq_states state)
675{
676 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
677
678 irq_ptr->state = state;
679 mb();
680}
681
682static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
683{
684 if (irb->esw.esw0.erw.cons) {
685 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
686 DBF_ERROR_HEX(addr: irb, len: 64);
687 DBF_ERROR_HEX(addr: irb->ecw, len: 64);
688 }
689}
690
691/* PCI interrupt handler */
692static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
693{
694 if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
695 return;
696
697 qdio_deliver_irq(irq: irq_ptr);
698 irq_ptr->last_data_irq_time = S390_lowcore.int_clock;
699}
700
701static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
702 unsigned long intparm, int cstat,
703 int dstat)
704{
705 unsigned int first_to_check = 0;
706
707 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
708 DBF_ERROR("intp :%lx", intparm);
709 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
710
711 /* zfcp wants this: */
712 if (irq_ptr->nr_input_qs)
713 first_to_check = irq_ptr->input_qs[0]->first_to_check;
714
715 irq_ptr->error_handler(irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 0,
716 first_to_check, 0, irq_ptr->int_parm);
717 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_STOPPED);
718 /*
719 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
720 * Therefore we call the LGR detection function here.
721 */
722 lgr_info_log();
723}
724
725static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat,
726 int dstat)
727{
728 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
729
730 if (cstat)
731 goto error;
732 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
733 goto error;
734 if (!(dstat & DEV_STAT_DEV_END))
735 goto error;
736 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_ESTABLISHED);
737 return;
738
739error:
740 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
741 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
742 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_ERR);
743}
744
745/* qdio interrupt handler */
746void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
747 struct irb *irb)
748{
749 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
750 struct subchannel_id schid;
751 int cstat, dstat;
752
753 if (!intparm || !irq_ptr) {
754 ccw_device_get_schid(cdev, &schid);
755 DBF_ERROR("qint:%4x", schid.sch_no);
756 return;
757 }
758
759 if (irq_ptr->perf_stat_enabled)
760 irq_ptr->perf_stat.qdio_int++;
761
762 if (IS_ERR(ptr: irb)) {
763 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
764 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_ERR);
765 wake_up(&cdev->private->wait_q);
766 return;
767 }
768 qdio_irq_check_sense(irq_ptr, irb);
769 cstat = irb->scsw.cmd.cstat;
770 dstat = irb->scsw.cmd.dstat;
771
772 switch (irq_ptr->state) {
773 case QDIO_IRQ_STATE_INACTIVE:
774 qdio_establish_handle_irq(irq_ptr, cstat, dstat);
775 break;
776 case QDIO_IRQ_STATE_CLEANUP:
777 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_INACTIVE);
778 break;
779 case QDIO_IRQ_STATE_ESTABLISHED:
780 case QDIO_IRQ_STATE_ACTIVE:
781 if (cstat & SCHN_STAT_PCI) {
782 qdio_int_handler_pci(irq_ptr);
783 return;
784 }
785 if (cstat || dstat)
786 qdio_handle_activate_check(irq_ptr, intparm, cstat,
787 dstat);
788 break;
789 case QDIO_IRQ_STATE_STOPPED:
790 break;
791 default:
792 WARN_ON_ONCE(1);
793 }
794 wake_up(&cdev->private->wait_q);
795}
796
797/**
798 * qdio_get_ssqd_desc - get qdio subchannel description
799 * @cdev: ccw device to get description for
800 * @data: where to store the ssqd
801 *
802 * Returns 0 or an error code. The results of the chsc are stored in the
803 * specified structure.
804 */
805int qdio_get_ssqd_desc(struct ccw_device *cdev,
806 struct qdio_ssqd_desc *data)
807{
808 struct subchannel_id schid;
809
810 if (!cdev || !cdev->private)
811 return -EINVAL;
812
813 ccw_device_get_schid(cdev, &schid);
814 DBF_EVENT("get ssqd:%4x", schid.sch_no);
815 return qdio_setup_get_ssqd(NULL, schid: &schid, data);
816}
817EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
818
819static int qdio_cancel_ccw(struct qdio_irq *irq, int how)
820{
821 struct ccw_device *cdev = irq->cdev;
822 long timeout;
823 int rc;
824
825 spin_lock_irq(lock: get_ccwdev_lock(cdev));
826 qdio_set_state(irq_ptr: irq, state: QDIO_IRQ_STATE_CLEANUP);
827 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
828 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
829 else
830 /* default behaviour is halt */
831 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
832 spin_unlock_irq(lock: get_ccwdev_lock(cdev));
833 if (rc) {
834 DBF_ERROR("%4x SHUTD ERR", irq->schid.sch_no);
835 DBF_ERROR("rc:%4d", rc);
836 return rc;
837 }
838
839 timeout = wait_event_interruptible_timeout(cdev->private->wait_q,
840 irq->state == QDIO_IRQ_STATE_INACTIVE ||
841 irq->state == QDIO_IRQ_STATE_ERR,
842 10 * HZ);
843 if (timeout <= 0)
844 rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
845
846 return rc;
847}
848
849/**
850 * qdio_shutdown - shut down a qdio subchannel
851 * @cdev: associated ccw device
852 * @how: use halt or clear to shutdown
853 */
854int qdio_shutdown(struct ccw_device *cdev, int how)
855{
856 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
857 struct subchannel_id schid;
858 int rc;
859
860 if (!irq_ptr)
861 return -ENODEV;
862
863 WARN_ON_ONCE(irqs_disabled());
864 ccw_device_get_schid(cdev, &schid);
865 DBF_EVENT("qshutdown:%4x", schid.sch_no);
866
867 mutex_lock(&irq_ptr->setup_mutex);
868 /*
869 * Subchannel was already shot down. We cannot prevent being called
870 * twice since cio may trigger a shutdown asynchronously.
871 */
872 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
873 mutex_unlock(lock: &irq_ptr->setup_mutex);
874 return 0;
875 }
876
877 /*
878 * Indicate that the device is going down.
879 */
880 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_STOPPED);
881
882 qdio_shutdown_debug_entries(irq_ptr);
883
884 rc = qdio_cancel_ccw(irq: irq_ptr, how);
885 qdio_shutdown_thinint(irq_ptr);
886 qdio_shutdown_irq(irq: irq_ptr);
887
888 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_INACTIVE);
889 mutex_unlock(lock: &irq_ptr->setup_mutex);
890 if (rc)
891 return rc;
892 return 0;
893}
894EXPORT_SYMBOL_GPL(qdio_shutdown);
895
896/**
897 * qdio_free - free data structures for a qdio subchannel
898 * @cdev: associated ccw device
899 */
900int qdio_free(struct ccw_device *cdev)
901{
902 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
903 struct subchannel_id schid;
904
905 if (!irq_ptr)
906 return -ENODEV;
907
908 ccw_device_get_schid(cdev, &schid);
909 DBF_EVENT("qfree:%4x", schid.sch_no);
910 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
911 mutex_lock(&irq_ptr->setup_mutex);
912
913 irq_ptr->debug_area = NULL;
914 cdev->private->qdio_data = NULL;
915 mutex_unlock(lock: &irq_ptr->setup_mutex);
916
917 qdio_free_queues(irq_ptr);
918 free_page((unsigned long) irq_ptr->qdr);
919 free_page(irq_ptr->chsc_page);
920 kfree(objp: irq_ptr->ccw);
921 free_page((unsigned long) irq_ptr);
922 return 0;
923}
924EXPORT_SYMBOL_GPL(qdio_free);
925
926/**
927 * qdio_allocate - allocate qdio queues and associated data
928 * @cdev: associated ccw device
929 * @no_input_qs: allocate this number of Input Queues
930 * @no_output_qs: allocate this number of Output Queues
931 */
932int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
933 unsigned int no_output_qs)
934{
935 struct subchannel_id schid;
936 struct qdio_irq *irq_ptr;
937 int rc = -ENOMEM;
938
939 ccw_device_get_schid(cdev, &schid);
940 DBF_EVENT("qallocate:%4x", schid.sch_no);
941
942 if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
943 no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
944 return -EINVAL;
945
946 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL);
947 if (!irq_ptr)
948 return -ENOMEM;
949
950 irq_ptr->ccw = kmalloc(sizeof(*irq_ptr->ccw), GFP_KERNEL | GFP_DMA);
951 if (!irq_ptr->ccw)
952 goto err_ccw;
953
954 /* kmemleak doesn't scan the page-allocated irq_ptr: */
955 kmemleak_not_leak(ptr: irq_ptr->ccw);
956
957 irq_ptr->cdev = cdev;
958 mutex_init(&irq_ptr->setup_mutex);
959 if (qdio_allocate_dbf(irq_ptr))
960 goto err_dbf;
961
962 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
963 no_output_qs);
964
965 /*
966 * Allocate a page for the chsc calls in qdio_establish.
967 * Must be pre-allocated since a zfcp recovery will call
968 * qdio_establish. In case of low memory and swap on a zfcp disk
969 * we may not be able to allocate memory otherwise.
970 */
971 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
972 if (!irq_ptr->chsc_page)
973 goto err_chsc;
974
975 /* qdr is used in ccw1.cda which is u32 */
976 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
977 if (!irq_ptr->qdr)
978 goto err_qdr;
979
980 rc = qdio_allocate_qs(irq_ptr, nr_input_qs: no_input_qs, nr_output_qs: no_output_qs);
981 if (rc)
982 goto err_queues;
983
984 cdev->private->qdio_data = irq_ptr;
985 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_INACTIVE);
986 return 0;
987
988err_queues:
989 free_page((unsigned long) irq_ptr->qdr);
990err_qdr:
991 free_page(irq_ptr->chsc_page);
992err_chsc:
993err_dbf:
994 kfree(objp: irq_ptr->ccw);
995err_ccw:
996 free_page((unsigned long) irq_ptr);
997 return rc;
998}
999EXPORT_SYMBOL_GPL(qdio_allocate);
1000
1001static void qdio_trace_init_data(struct qdio_irq *irq,
1002 struct qdio_initialize *data)
1003{
1004 DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
1005 DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
1006 DBF_DEV_HEX(dev: irq, addr: &data->qib_param_field, len: sizeof(void *), DBF_ERR);
1007 DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
1008 data->no_output_qs);
1009 DBF_DEV_HEX(dev: irq, addr: &data->input_handler, len: sizeof(void *), DBF_ERR);
1010 DBF_DEV_HEX(dev: irq, addr: &data->output_handler, len: sizeof(void *), DBF_ERR);
1011 DBF_DEV_HEX(dev: irq, addr: &data->int_parm, len: sizeof(long), DBF_ERR);
1012 DBF_DEV_HEX(dev: irq, addr: &data->input_sbal_addr_array, len: sizeof(void *), DBF_ERR);
1013 DBF_DEV_HEX(dev: irq, addr: &data->output_sbal_addr_array, len: sizeof(void *),
1014 DBF_ERR);
1015}
1016
1017/**
1018 * qdio_establish - establish queues on a qdio subchannel
1019 * @cdev: associated ccw device
1020 * @init_data: initialization data
1021 */
1022int qdio_establish(struct ccw_device *cdev,
1023 struct qdio_initialize *init_data)
1024{
1025 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1026 struct subchannel_id schid;
1027 struct ciw *ciw;
1028 long timeout;
1029 int rc;
1030
1031 ccw_device_get_schid(cdev, &schid);
1032 DBF_EVENT("qestablish:%4x", schid.sch_no);
1033
1034 if (!irq_ptr)
1035 return -ENODEV;
1036
1037 if (init_data->no_input_qs > irq_ptr->max_input_qs ||
1038 init_data->no_output_qs > irq_ptr->max_output_qs)
1039 return -EINVAL;
1040
1041 /* Needed as error_handler: */
1042 if (!init_data->input_handler)
1043 return -EINVAL;
1044
1045 if (init_data->no_output_qs && !init_data->output_handler)
1046 return -EINVAL;
1047
1048 if (!init_data->input_sbal_addr_array ||
1049 !init_data->output_sbal_addr_array)
1050 return -EINVAL;
1051
1052 if (!init_data->irq_poll)
1053 return -EINVAL;
1054
1055 ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
1056 if (!ciw) {
1057 DBF_ERROR("%4x NO EQ", schid.sch_no);
1058 return -EIO;
1059 }
1060
1061 mutex_lock(&irq_ptr->setup_mutex);
1062 qdio_trace_init_data(irq: irq_ptr, data: init_data);
1063 qdio_setup_irq(irq_ptr, init_data);
1064
1065 rc = qdio_establish_thinint(irq_ptr);
1066 if (rc)
1067 goto err_thinint;
1068
1069 /* establish q */
1070 irq_ptr->ccw->cmd_code = ciw->cmd;
1071 irq_ptr->ccw->flags = CCW_FLAG_SLI;
1072 irq_ptr->ccw->count = ciw->count;
1073 irq_ptr->ccw->cda = (u32) virt_to_phys(address: irq_ptr->qdr);
1074
1075 spin_lock_irq(lock: get_ccwdev_lock(cdev));
1076 ccw_device_set_options_mask(cdev, 0);
1077
1078 rc = ccw_device_start(cdev, irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1079 spin_unlock_irq(lock: get_ccwdev_lock(cdev));
1080 if (rc) {
1081 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1082 DBF_ERROR("rc:%4x", rc);
1083 goto err_ccw_start;
1084 }
1085
1086 timeout = wait_event_interruptible_timeout(cdev->private->wait_q,
1087 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1088 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1089 if (timeout <= 0) {
1090 rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
1091 goto err_ccw_timeout;
1092 }
1093
1094 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1095 rc = -EIO;
1096 goto err_ccw_error;
1097 }
1098
1099 qdio_setup_ssqd_info(irq_ptr);
1100
1101 /* qebsm is now setup if available, initialize buffer states */
1102 qdio_init_buf_states(irq_ptr);
1103
1104 mutex_unlock(lock: &irq_ptr->setup_mutex);
1105 qdio_print_subchannel_info(irq_ptr);
1106 qdio_setup_debug_entries(irq_ptr);
1107 return 0;
1108
1109err_ccw_timeout:
1110 qdio_cancel_ccw(irq_ptr, QDIO_FLAG_CLEANUP_USING_CLEAR);
1111err_ccw_error:
1112err_ccw_start:
1113 qdio_shutdown_thinint(irq_ptr);
1114err_thinint:
1115 qdio_shutdown_irq(irq: irq_ptr);
1116 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_INACTIVE);
1117 mutex_unlock(lock: &irq_ptr->setup_mutex);
1118 return rc;
1119}
1120EXPORT_SYMBOL_GPL(qdio_establish);
1121
1122/**
1123 * qdio_activate - activate queues on a qdio subchannel
1124 * @cdev: associated cdev
1125 */
1126int qdio_activate(struct ccw_device *cdev)
1127{
1128 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1129 struct subchannel_id schid;
1130 struct ciw *ciw;
1131 int rc;
1132
1133 ccw_device_get_schid(cdev, &schid);
1134 DBF_EVENT("qactivate:%4x", schid.sch_no);
1135
1136 if (!irq_ptr)
1137 return -ENODEV;
1138
1139 ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
1140 if (!ciw) {
1141 DBF_ERROR("%4x NO AQ", schid.sch_no);
1142 return -EIO;
1143 }
1144
1145 mutex_lock(&irq_ptr->setup_mutex);
1146 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1147 rc = -EBUSY;
1148 goto out;
1149 }
1150
1151 irq_ptr->ccw->cmd_code = ciw->cmd;
1152 irq_ptr->ccw->flags = CCW_FLAG_SLI;
1153 irq_ptr->ccw->count = ciw->count;
1154 irq_ptr->ccw->cda = 0;
1155
1156 spin_lock_irq(lock: get_ccwdev_lock(cdev));
1157 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1158
1159 rc = ccw_device_start(cdev, irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1160 0, DOIO_DENY_PREFETCH);
1161 spin_unlock_irq(lock: get_ccwdev_lock(cdev));
1162 if (rc) {
1163 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1164 DBF_ERROR("rc:%4x", rc);
1165 goto out;
1166 }
1167
1168 /* wait for subchannel to become active */
1169 msleep(msecs: 5);
1170
1171 switch (irq_ptr->state) {
1172 case QDIO_IRQ_STATE_STOPPED:
1173 case QDIO_IRQ_STATE_ERR:
1174 rc = -EIO;
1175 break;
1176 default:
1177 qdio_set_state(irq_ptr, state: QDIO_IRQ_STATE_ACTIVE);
1178 rc = 0;
1179 }
1180out:
1181 mutex_unlock(lock: &irq_ptr->setup_mutex);
1182 return rc;
1183}
1184EXPORT_SYMBOL_GPL(qdio_activate);
1185
1186/**
1187 * handle_inbound - reset processed input buffers
1188 * @q: queue containing the buffers
1189 * @bufnr: first buffer to process
1190 * @count: how many buffers are emptied
1191 */
1192static int handle_inbound(struct qdio_q *q, int bufnr, int count)
1193{
1194 int overlap;
1195
1196 qperf_inc(q, inbound_call);
1197
1198 /* If any processed SBALs are returned to HW, adjust our tracking: */
1199 overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
1200 q->u.in.batch_count);
1201 if (overlap > 0) {
1202 q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
1203 q->u.in.batch_count -= overlap;
1204 }
1205
1206 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1207 atomic_add(i: count, v: &q->nr_buf_used);
1208
1209 if (qdio_need_siga_in(q->irq_ptr))
1210 return qdio_siga_input(q);
1211
1212 return 0;
1213}
1214
1215/**
1216 * qdio_add_bufs_to_input_queue - process buffers on an Input Queue
1217 * @cdev: associated ccw_device for the qdio subchannel
1218 * @q_nr: queue number
1219 * @bufnr: buffer number
1220 * @count: how many buffers to process
1221 */
1222int qdio_add_bufs_to_input_queue(struct ccw_device *cdev, unsigned int q_nr,
1223 unsigned int bufnr, unsigned int count)
1224{
1225 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1226
1227 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1228 return -EINVAL;
1229
1230 if (!irq_ptr)
1231 return -ENODEV;
1232
1233 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "addi b:%02x c:%02x", bufnr, count);
1234
1235 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1236 return -EIO;
1237 if (!count)
1238 return 0;
1239
1240 return handle_inbound(q: irq_ptr->input_qs[q_nr], bufnr, count);
1241}
1242EXPORT_SYMBOL_GPL(qdio_add_bufs_to_input_queue);
1243
1244/**
1245 * handle_outbound - process filled outbound buffers
1246 * @q: queue containing the buffers
1247 * @bufnr: first buffer to process
1248 * @count: how many buffers are filled
1249 * @aob: asynchronous operation block
1250 */
1251static int handle_outbound(struct qdio_q *q, unsigned int bufnr, unsigned int count,
1252 struct qaob *aob)
1253{
1254 unsigned char state = 0;
1255 int used, rc = 0;
1256
1257 qperf_inc(q, outbound_call);
1258
1259 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1260 used = atomic_add_return(i: count, v: &q->nr_buf_used);
1261
1262 if (used == QDIO_MAX_BUFFERS_PER_Q)
1263 qperf_inc(q, outbound_queue_full);
1264
1265 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1266 unsigned long phys_aob = aob ? virt_to_phys(address: aob) : 0;
1267
1268 WARN_ON_ONCE(!IS_ALIGNED(phys_aob, 256));
1269 rc = qdio_kick_outbound_q(q, count, aob: phys_aob);
1270 } else if (qdio_need_siga_sync(q->irq_ptr)) {
1271 rc = qdio_sync_output_queue(q);
1272 } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1273 get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1274 state == SLSB_CU_OUTPUT_PRIMED) {
1275 /* The previous buffer is not processed yet, tack on. */
1276 qperf_inc(q, fast_requeue);
1277 } else {
1278 rc = qdio_kick_outbound_q(q, count, aob: 0);
1279 }
1280
1281 return rc;
1282}
1283
1284/**
1285 * qdio_add_bufs_to_output_queue - process buffers on an Output Queue
1286 * @cdev: associated ccw_device for the qdio subchannel
1287 * @q_nr: queue number
1288 * @bufnr: buffer number
1289 * @count: how many buffers to process
1290 * @aob: asynchronous operation block
1291 */
1292int qdio_add_bufs_to_output_queue(struct ccw_device *cdev, unsigned int q_nr,
1293 unsigned int bufnr, unsigned int count,
1294 struct qaob *aob)
1295{
1296 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1297
1298 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1299 return -EINVAL;
1300
1301 if (!irq_ptr)
1302 return -ENODEV;
1303
1304 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "addo b:%02x c:%02x", bufnr, count);
1305
1306 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1307 return -EIO;
1308 if (!count)
1309 return 0;
1310
1311 return handle_outbound(q: irq_ptr->output_qs[q_nr], bufnr, count, aob);
1312}
1313EXPORT_SYMBOL_GPL(qdio_add_bufs_to_output_queue);
1314
1315/**
1316 * qdio_start_irq - enable interrupt processing for the device
1317 * @cdev: associated ccw_device for the qdio subchannel
1318 *
1319 * Return codes
1320 * 0 - success
1321 * 1 - irqs not started since new data is available
1322 */
1323int qdio_start_irq(struct ccw_device *cdev)
1324{
1325 struct qdio_q *q;
1326 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1327 unsigned int i;
1328
1329 if (!irq_ptr)
1330 return -ENODEV;
1331
1332 for_each_input_queue(irq_ptr, q, i)
1333 qdio_stop_polling(q);
1334
1335 clear_bit(nr: QDIO_IRQ_DISABLED, addr: &irq_ptr->poll_state);
1336
1337 /*
1338 * We need to check again to not lose initiative after
1339 * resetting the ACK state.
1340 */
1341 if (test_nonshared_ind(irq_ptr))
1342 goto rescan;
1343
1344 for_each_input_queue(irq_ptr, q, i) {
1345 if (!qdio_inbound_q_done(q, start: q->first_to_check))
1346 goto rescan;
1347 }
1348
1349 return 0;
1350
1351rescan:
1352 if (test_and_set_bit(nr: QDIO_IRQ_DISABLED, addr: &irq_ptr->poll_state))
1353 return 0;
1354 else
1355 return 1;
1356
1357}
1358EXPORT_SYMBOL(qdio_start_irq);
1359
1360/**
1361 * qdio_stop_irq - disable interrupt processing for the device
1362 * @cdev: associated ccw_device for the qdio subchannel
1363 *
1364 * Return codes
1365 * 0 - interrupts were already disabled
1366 * 1 - interrupts successfully disabled
1367 */
1368int qdio_stop_irq(struct ccw_device *cdev)
1369{
1370 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1371
1372 if (!irq_ptr)
1373 return -ENODEV;
1374
1375 if (test_and_set_bit(nr: QDIO_IRQ_DISABLED, addr: &irq_ptr->poll_state))
1376 return 0;
1377 else
1378 return 1;
1379}
1380EXPORT_SYMBOL(qdio_stop_irq);
1381
1382static int __init init_QDIO(void)
1383{
1384 int rc;
1385
1386 rc = qdio_debug_init();
1387 if (rc)
1388 return rc;
1389 rc = qdio_setup_init();
1390 if (rc)
1391 goto out_debug;
1392 rc = qdio_thinint_init();
1393 if (rc)
1394 goto out_cache;
1395 return 0;
1396
1397out_cache:
1398 qdio_setup_exit();
1399out_debug:
1400 qdio_debug_exit();
1401 return rc;
1402}
1403
1404static void __exit exit_QDIO(void)
1405{
1406 qdio_thinint_exit();
1407 qdio_setup_exit();
1408 qdio_debug_exit();
1409}
1410
1411module_init(init_QDIO);
1412module_exit(exit_QDIO);
1413

source code of linux/drivers/s390/cio/qdio_main.c