xref: /linux/drivers/s390/cio/qdio_main.c (revision b889fcf63cb62e7fdb7816565e28f44dbe4a76a5)
1 /*
2  * Linux for s390 qdio support, buffer handling, qdio API and module support.
3  *
4  * Copyright IBM Corp. 2000, 2008
5  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
6  *	      Jan Glauber <jang@linux.vnet.ibm.com>
7  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
8  */
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/timer.h>
13 #include <linux/delay.h>
14 #include <linux/gfp.h>
15 #include <linux/io.h>
16 #include <linux/atomic.h>
17 #include <asm/debug.h>
18 #include <asm/qdio.h>
19 #include <asm/ipl.h>
20 
21 #include "cio.h"
22 #include "css.h"
23 #include "device.h"
24 #include "qdio.h"
25 #include "qdio_debug.h"
26 
27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
28 	"Jan Glauber <jang@linux.vnet.ibm.com>");
29 MODULE_DESCRIPTION("QDIO base support");
30 MODULE_LICENSE("GPL");
31 
32 static inline int do_siga_sync(unsigned long schid,
33 			       unsigned int out_mask, unsigned int in_mask,
34 			       unsigned int fc)
35 {
36 	register unsigned long __fc asm ("0") = fc;
37 	register unsigned long __schid asm ("1") = schid;
38 	register unsigned long out asm ("2") = out_mask;
39 	register unsigned long in asm ("3") = in_mask;
40 	int cc;
41 
42 	asm volatile(
43 		"	siga	0\n"
44 		"	ipm	%0\n"
45 		"	srl	%0,28\n"
46 		: "=d" (cc)
47 		: "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
48 	return cc;
49 }
50 
51 static inline int do_siga_input(unsigned long schid, unsigned int mask,
52 				unsigned int fc)
53 {
54 	register unsigned long __fc asm ("0") = fc;
55 	register unsigned long __schid asm ("1") = schid;
56 	register unsigned long __mask asm ("2") = mask;
57 	int cc;
58 
59 	asm volatile(
60 		"	siga	0\n"
61 		"	ipm	%0\n"
62 		"	srl	%0,28\n"
63 		: "=d" (cc)
64 		: "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
65 	return cc;
66 }
67 
68 /**
69  * do_siga_output - perform SIGA-w/wt function
70  * @schid: subchannel id or in case of QEBSM the subchannel token
71  * @mask: which output queues to process
72  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
73  * @fc: function code to perform
74  *
75  * Returns condition code.
76  * Note: For IQDC unicast queues only the highest priority queue is processed.
77  */
78 static inline int do_siga_output(unsigned long schid, unsigned long mask,
79 				 unsigned int *bb, unsigned int fc,
80 				 unsigned long aob)
81 {
82 	register unsigned long __fc asm("0") = fc;
83 	register unsigned long __schid asm("1") = schid;
84 	register unsigned long __mask asm("2") = mask;
85 	register unsigned long __aob asm("3") = aob;
86 	int cc;
87 
88 	asm volatile(
89 		"	siga	0\n"
90 		"	ipm	%0\n"
91 		"	srl	%0,28\n"
92 		: "=d" (cc), "+d" (__fc), "+d" (__aob)
93 		: "d" (__schid), "d" (__mask)
94 		: "cc");
95 	*bb = __fc >> 31;
96 	return cc;
97 }
98 
99 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
100 {
101 	/* all done or next buffer state different */
102 	if (ccq == 0 || ccq == 32)
103 		return 0;
104 	/* no buffer processed */
105 	if (ccq == 97)
106 		return 1;
107 	/* not all buffers processed */
108 	if (ccq == 96)
109 		return 2;
110 	/* notify devices immediately */
111 	DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
112 	return -EIO;
113 }
114 
115 /**
116  * qdio_do_eqbs - extract buffer states for QEBSM
117  * @q: queue to manipulate
118  * @state: state of the extracted buffers
119  * @start: buffer number to start at
120  * @count: count of buffers to examine
121  * @auto_ack: automatically acknowledge buffers
122  *
123  * Returns the number of successfully extracted equal buffer states.
124  * Stops processing if a state is different from the last buffers state.
125  */
126 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
127 			int start, int count, int auto_ack)
128 {
129 	int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
130 	unsigned int ccq = 0;
131 
132 	qperf_inc(q, eqbs);
133 
134 	if (!q->is_input_q)
135 		nr += q->irq_ptr->nr_input_qs;
136 again:
137 	ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
138 		      auto_ack);
139 	rc = qdio_check_ccq(q, ccq);
140 	if (!rc)
141 		return count - tmp_count;
142 
143 	if (rc == 1) {
144 		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
145 		goto again;
146 	}
147 
148 	if (rc == 2) {
149 		qperf_inc(q, eqbs_partial);
150 		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
151 			tmp_count);
152 		/*
153 		 * Retry once, if that fails bail out and process the
154 		 * extracted buffers before trying again.
155 		 */
156 		if (!retried++)
157 			goto again;
158 		else
159 			return count - tmp_count;
160 	}
161 
162 	DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
163 	DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
164 	q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE,
165 		   q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
166 	return 0;
167 }
168 
169 /**
170  * qdio_do_sqbs - set buffer states for QEBSM
171  * @q: queue to manipulate
172  * @state: new state of the buffers
173  * @start: first buffer number to change
174  * @count: how many buffers to change
175  *
176  * Returns the number of successfully changed buffers.
177  * Does retrying until the specified count of buffer states is set or an
178  * error occurs.
179  */
180 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
181 			int count)
182 {
183 	unsigned int ccq = 0;
184 	int tmp_count = count, tmp_start = start;
185 	int nr = q->nr;
186 	int rc;
187 
188 	if (!count)
189 		return 0;
190 	qperf_inc(q, sqbs);
191 
192 	if (!q->is_input_q)
193 		nr += q->irq_ptr->nr_input_qs;
194 again:
195 	ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
196 	rc = qdio_check_ccq(q, ccq);
197 	if (!rc) {
198 		WARN_ON_ONCE(tmp_count);
199 		return count - tmp_count;
200 	}
201 
202 	if (rc == 1 || rc == 2) {
203 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
204 		qperf_inc(q, sqbs_partial);
205 		goto again;
206 	}
207 
208 	DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
209 	DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
210 	q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE,
211 		   q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
212 	return 0;
213 }
214 
215 /* returns number of examined buffers and their common state in *state */
216 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
217 				 unsigned char *state, unsigned int count,
218 				 int auto_ack, int merge_pending)
219 {
220 	unsigned char __state = 0;
221 	int i;
222 
223 	if (is_qebsm(q))
224 		return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
225 
226 	for (i = 0; i < count; i++) {
227 		if (!__state) {
228 			__state = q->slsb.val[bufnr];
229 			if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
230 				__state = SLSB_P_OUTPUT_EMPTY;
231 		} else if (merge_pending) {
232 			if ((q->slsb.val[bufnr] & __state) != __state)
233 				break;
234 		} else if (q->slsb.val[bufnr] != __state)
235 			break;
236 		bufnr = next_buf(bufnr);
237 	}
238 	*state = __state;
239 	return i;
240 }
241 
242 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
243 				unsigned char *state, int auto_ack)
244 {
245 	return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
246 }
247 
248 /* wrap-around safe setting of slsb states, returns number of changed buffers */
249 static inline int set_buf_states(struct qdio_q *q, int bufnr,
250 				 unsigned char state, int count)
251 {
252 	int i;
253 
254 	if (is_qebsm(q))
255 		return qdio_do_sqbs(q, state, bufnr, count);
256 
257 	for (i = 0; i < count; i++) {
258 		xchg(&q->slsb.val[bufnr], state);
259 		bufnr = next_buf(bufnr);
260 	}
261 	return count;
262 }
263 
264 static inline int set_buf_state(struct qdio_q *q, int bufnr,
265 				unsigned char state)
266 {
267 	return set_buf_states(q, bufnr, state, 1);
268 }
269 
270 /* set slsb states to initial state */
271 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
272 {
273 	struct qdio_q *q;
274 	int i;
275 
276 	for_each_input_queue(irq_ptr, q, i)
277 		set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
278 			       QDIO_MAX_BUFFERS_PER_Q);
279 	for_each_output_queue(irq_ptr, q, i)
280 		set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
281 			       QDIO_MAX_BUFFERS_PER_Q);
282 }
283 
284 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
285 			  unsigned int input)
286 {
287 	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
288 	unsigned int fc = QDIO_SIGA_SYNC;
289 	int cc;
290 
291 	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
292 	qperf_inc(q, siga_sync);
293 
294 	if (is_qebsm(q)) {
295 		schid = q->irq_ptr->sch_token;
296 		fc |= QDIO_SIGA_QEBSM_FLAG;
297 	}
298 
299 	cc = do_siga_sync(schid, output, input, fc);
300 	if (unlikely(cc))
301 		DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
302 	return (cc) ? -EIO : 0;
303 }
304 
305 static inline int qdio_siga_sync_q(struct qdio_q *q)
306 {
307 	if (q->is_input_q)
308 		return qdio_siga_sync(q, 0, q->mask);
309 	else
310 		return qdio_siga_sync(q, q->mask, 0);
311 }
312 
313 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
314 	unsigned long aob)
315 {
316 	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
317 	unsigned int fc = QDIO_SIGA_WRITE;
318 	u64 start_time = 0;
319 	int retries = 0, cc;
320 	unsigned long laob = 0;
321 
322 	if (q->u.out.use_cq && aob != 0) {
323 		fc = QDIO_SIGA_WRITEQ;
324 		laob = aob;
325 	}
326 
327 	if (is_qebsm(q)) {
328 		schid = q->irq_ptr->sch_token;
329 		fc |= QDIO_SIGA_QEBSM_FLAG;
330 	}
331 again:
332 	WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
333 		(aob && fc != QDIO_SIGA_WRITEQ));
334 	cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
335 
336 	/* hipersocket busy condition */
337 	if (unlikely(*busy_bit)) {
338 		retries++;
339 
340 		if (!start_time) {
341 			start_time = get_clock();
342 			goto again;
343 		}
344 		if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
345 			goto again;
346 	}
347 	if (retries) {
348 		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
349 			      "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
350 		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
351 	}
352 	return cc;
353 }
354 
355 static inline int qdio_siga_input(struct qdio_q *q)
356 {
357 	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
358 	unsigned int fc = QDIO_SIGA_READ;
359 	int cc;
360 
361 	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
362 	qperf_inc(q, siga_read);
363 
364 	if (is_qebsm(q)) {
365 		schid = q->irq_ptr->sch_token;
366 		fc |= QDIO_SIGA_QEBSM_FLAG;
367 	}
368 
369 	cc = do_siga_input(schid, q->mask, fc);
370 	if (unlikely(cc))
371 		DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
372 	return (cc) ? -EIO : 0;
373 }
374 
375 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
376 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
377 
378 static inline void qdio_sync_queues(struct qdio_q *q)
379 {
380 	/* PCI capable outbound queues will also be scanned so sync them too */
381 	if (pci_out_supported(q))
382 		qdio_siga_sync_all(q);
383 	else
384 		qdio_siga_sync_q(q);
385 }
386 
387 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
388 			unsigned char *state)
389 {
390 	if (need_siga_sync(q))
391 		qdio_siga_sync_q(q);
392 	return get_buf_states(q, bufnr, state, 1, 0, 0);
393 }
394 
395 static inline void qdio_stop_polling(struct qdio_q *q)
396 {
397 	if (!q->u.in.polling)
398 		return;
399 
400 	q->u.in.polling = 0;
401 	qperf_inc(q, stop_polling);
402 
403 	/* show the card that we are not polling anymore */
404 	if (is_qebsm(q)) {
405 		set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
406 			       q->u.in.ack_count);
407 		q->u.in.ack_count = 0;
408 	} else
409 		set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
410 }
411 
412 static inline void account_sbals(struct qdio_q *q, int count)
413 {
414 	int pos = 0;
415 
416 	q->q_stats.nr_sbal_total += count;
417 	if (count == QDIO_MAX_BUFFERS_MASK) {
418 		q->q_stats.nr_sbals[7]++;
419 		return;
420 	}
421 	while (count >>= 1)
422 		pos++;
423 	q->q_stats.nr_sbals[pos]++;
424 }
425 
426 static void process_buffer_error(struct qdio_q *q, int count)
427 {
428 	unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
429 					SLSB_P_OUTPUT_NOT_INIT;
430 
431 	q->qdio_error = QDIO_ERROR_SLSB_STATE;
432 
433 	/* special handling for no target buffer empty */
434 	if ((!q->is_input_q &&
435 	    (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
436 		qperf_inc(q, target_full);
437 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
438 			      q->first_to_check);
439 		goto set;
440 	}
441 
442 	DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
443 	DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
444 	DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
445 	DBF_ERROR("F14:%2x F15:%2x",
446 		  q->sbal[q->first_to_check]->element[14].sflags,
447 		  q->sbal[q->first_to_check]->element[15].sflags);
448 
449 set:
450 	/*
451 	 * Interrupts may be avoided as long as the error is present
452 	 * so change the buffer state immediately to avoid starvation.
453 	 */
454 	set_buf_states(q, q->first_to_check, state, count);
455 }
456 
457 static inline void inbound_primed(struct qdio_q *q, int count)
458 {
459 	int new;
460 
461 	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
462 
463 	/* for QEBSM the ACK was already set by EQBS */
464 	if (is_qebsm(q)) {
465 		if (!q->u.in.polling) {
466 			q->u.in.polling = 1;
467 			q->u.in.ack_count = count;
468 			q->u.in.ack_start = q->first_to_check;
469 			return;
470 		}
471 
472 		/* delete the previous ACK's */
473 		set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
474 			       q->u.in.ack_count);
475 		q->u.in.ack_count = count;
476 		q->u.in.ack_start = q->first_to_check;
477 		return;
478 	}
479 
480 	/*
481 	 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
482 	 * or by the next inbound run.
483 	 */
484 	new = add_buf(q->first_to_check, count - 1);
485 	if (q->u.in.polling) {
486 		/* reset the previous ACK but first set the new one */
487 		set_buf_state(q, new, SLSB_P_INPUT_ACK);
488 		set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
489 	} else {
490 		q->u.in.polling = 1;
491 		set_buf_state(q, new, SLSB_P_INPUT_ACK);
492 	}
493 
494 	q->u.in.ack_start = new;
495 	count--;
496 	if (!count)
497 		return;
498 	/* need to change ALL buffers to get more interrupts */
499 	set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
500 }
501 
502 static int get_inbound_buffer_frontier(struct qdio_q *q)
503 {
504 	int count, stop;
505 	unsigned char state = 0;
506 
507 	q->timestamp = get_clock();
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(count, &q->nr_buf_used) == 0)
532 			qperf_inc(q, inbound_queue_full);
533 		if (q->irq_ptr->perf_stat_enabled)
534 			account_sbals(q, count);
535 		break;
536 	case SLSB_P_INPUT_ERROR:
537 		process_buffer_error(q, count);
538 		q->first_to_check = add_buf(q->first_to_check, count);
539 		atomic_sub(count, &q->nr_buf_used);
540 		if (q->irq_ptr->perf_stat_enabled)
541 			account_sbals_error(q, count);
542 		break;
543 	case SLSB_CU_INPUT_EMPTY:
544 	case SLSB_P_INPUT_NOT_INIT:
545 	case SLSB_P_INPUT_ACK:
546 		if (q->irq_ptr->perf_stat_enabled)
547 			q->q_stats.nr_sbal_nop++;
548 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
549 		break;
550 	default:
551 		WARN_ON_ONCE(1);
552 	}
553 out:
554 	return q->first_to_check;
555 }
556 
557 static int qdio_inbound_q_moved(struct qdio_q *q)
558 {
559 	int bufnr;
560 
561 	bufnr = get_inbound_buffer_frontier(q);
562 
563 	if (bufnr != q->last_move) {
564 		q->last_move = bufnr;
565 		if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
566 			q->u.in.timestamp = get_clock();
567 		return 1;
568 	} else
569 		return 0;
570 }
571 
572 static inline int qdio_inbound_q_done(struct qdio_q *q)
573 {
574 	unsigned char state = 0;
575 
576 	if (!atomic_read(&q->nr_buf_used))
577 		return 1;
578 
579 	if (need_siga_sync(q))
580 		qdio_siga_sync_q(q);
581 	get_buf_state(q, q->first_to_check, &state, 0);
582 
583 	if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
584 		/* more work coming */
585 		return 0;
586 
587 	if (is_thinint_irq(q->irq_ptr))
588 		return 1;
589 
590 	/* don't poll under z/VM */
591 	if (MACHINE_IS_VM)
592 		return 1;
593 
594 	/*
595 	 * At this point we know, that inbound first_to_check
596 	 * has (probably) not moved (see qdio_inbound_processing).
597 	 */
598 	if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
599 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
600 			      q->first_to_check);
601 		return 1;
602 	} else
603 		return 0;
604 }
605 
606 static inline int contains_aobs(struct qdio_q *q)
607 {
608 	return !q->is_input_q && q->u.out.use_cq;
609 }
610 
611 static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
612 				int i, struct qaob *aob)
613 {
614 	int tmp;
615 
616 	DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
617 			(unsigned long) virt_to_phys(aob));
618 	DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
619 			(unsigned long) aob->res0[0]);
620 	DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
621 			(unsigned long) aob->res0[1]);
622 	DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
623 			(unsigned long) aob->res0[2]);
624 	DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
625 			(unsigned long) aob->res0[3]);
626 	DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
627 			(unsigned long) aob->res0[4]);
628 	DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
629 			(unsigned long) aob->res0[5]);
630 	DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
631 	DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
632 	DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
633 	DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
634 	DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
635 	DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
636 	DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
637 	for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
638 		DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
639 				(unsigned long) aob->sba[tmp]);
640 		DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
641 				(unsigned long) q->sbal[i]->element[tmp].addr);
642 		DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
643 		DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
644 				q->sbal[i]->element[tmp].length);
645 	}
646 	DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
647 	for (tmp = 0; tmp < 2; ++tmp) {
648 		DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
649 			(unsigned long) aob->res4[tmp]);
650 	}
651 	DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
652 	DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
653 }
654 
655 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
656 {
657 	unsigned char state = 0;
658 	int j, b = start;
659 
660 	if (!contains_aobs(q))
661 		return;
662 
663 	for (j = 0; j < count; ++j) {
664 		get_buf_state(q, b, &state, 0);
665 		if (state == SLSB_P_OUTPUT_PENDING) {
666 			struct qaob *aob = q->u.out.aobs[b];
667 			if (aob == NULL)
668 				continue;
669 
670 			q->u.out.sbal_state[b].flags |=
671 				QDIO_OUTBUF_STATE_FLAG_PENDING;
672 			q->u.out.aobs[b] = NULL;
673 		} else if (state == SLSB_P_OUTPUT_EMPTY) {
674 			q->u.out.sbal_state[b].aob = NULL;
675 		}
676 		b = next_buf(b);
677 	}
678 }
679 
680 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
681 					int bufnr)
682 {
683 	unsigned long phys_aob = 0;
684 
685 	if (!q->use_cq)
686 		goto out;
687 
688 	if (!q->aobs[bufnr]) {
689 		struct qaob *aob = qdio_allocate_aob();
690 		q->aobs[bufnr] = aob;
691 	}
692 	if (q->aobs[bufnr]) {
693 		q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
694 		q->sbal_state[bufnr].aob = q->aobs[bufnr];
695 		q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
696 		phys_aob = virt_to_phys(q->aobs[bufnr]);
697 		WARN_ON_ONCE(phys_aob & 0xFF);
698 	}
699 
700 out:
701 	return phys_aob;
702 }
703 
704 static void qdio_kick_handler(struct qdio_q *q)
705 {
706 	int start = q->first_to_kick;
707 	int end = q->first_to_check;
708 	int count;
709 
710 	if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
711 		return;
712 
713 	count = sub_buf(end, start);
714 
715 	if (q->is_input_q) {
716 		qperf_inc(q, inbound_handler);
717 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
718 	} else {
719 		qperf_inc(q, outbound_handler);
720 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
721 			      start, count);
722 	}
723 
724 	qdio_handle_aobs(q, start, count);
725 
726 	q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
727 		   q->irq_ptr->int_parm);
728 
729 	/* for the next time */
730 	q->first_to_kick = end;
731 	q->qdio_error = 0;
732 }
733 
734 static void __qdio_inbound_processing(struct qdio_q *q)
735 {
736 	qperf_inc(q, tasklet_inbound);
737 
738 	if (!qdio_inbound_q_moved(q))
739 		return;
740 
741 	qdio_kick_handler(q);
742 
743 	if (!qdio_inbound_q_done(q)) {
744 		/* means poll time is not yet over */
745 		qperf_inc(q, tasklet_inbound_resched);
746 		if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
747 			tasklet_schedule(&q->tasklet);
748 			return;
749 		}
750 	}
751 
752 	qdio_stop_polling(q);
753 	/*
754 	 * We need to check again to not lose initiative after
755 	 * resetting the ACK state.
756 	 */
757 	if (!qdio_inbound_q_done(q)) {
758 		qperf_inc(q, tasklet_inbound_resched2);
759 		if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
760 			tasklet_schedule(&q->tasklet);
761 	}
762 }
763 
764 void qdio_inbound_processing(unsigned long data)
765 {
766 	struct qdio_q *q = (struct qdio_q *)data;
767 	__qdio_inbound_processing(q);
768 }
769 
770 static int get_outbound_buffer_frontier(struct qdio_q *q)
771 {
772 	int count, stop;
773 	unsigned char state = 0;
774 
775 	q->timestamp = get_clock();
776 
777 	if (need_siga_sync(q))
778 		if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
779 		    !pci_out_supported(q)) ||
780 		    (queue_type(q) == QDIO_IQDIO_QFMT &&
781 		    multicast_outbound(q)))
782 			qdio_siga_sync_q(q);
783 
784 	/*
785 	 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
786 	 * would return 0.
787 	 */
788 	count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
789 	stop = add_buf(q->first_to_check, count);
790 	if (q->first_to_check == stop)
791 		goto out;
792 
793 	count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
794 	if (!count)
795 		goto out;
796 
797 	switch (state) {
798 	case SLSB_P_OUTPUT_EMPTY:
799 		/* the adapter got it */
800 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
801 			"out empty:%1d %02x", q->nr, count);
802 
803 		atomic_sub(count, &q->nr_buf_used);
804 		q->first_to_check = add_buf(q->first_to_check, count);
805 		if (q->irq_ptr->perf_stat_enabled)
806 			account_sbals(q, count);
807 
808 		break;
809 	case SLSB_P_OUTPUT_ERROR:
810 		process_buffer_error(q, count);
811 		q->first_to_check = add_buf(q->first_to_check, count);
812 		atomic_sub(count, &q->nr_buf_used);
813 		if (q->irq_ptr->perf_stat_enabled)
814 			account_sbals_error(q, count);
815 		break;
816 	case SLSB_CU_OUTPUT_PRIMED:
817 		/* the adapter has not fetched the output yet */
818 		if (q->irq_ptr->perf_stat_enabled)
819 			q->q_stats.nr_sbal_nop++;
820 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
821 			      q->nr);
822 		break;
823 	case SLSB_P_OUTPUT_NOT_INIT:
824 	case SLSB_P_OUTPUT_HALTED:
825 		break;
826 	default:
827 		WARN_ON_ONCE(1);
828 	}
829 
830 out:
831 	return q->first_to_check;
832 }
833 
834 /* all buffers processed? */
835 static inline int qdio_outbound_q_done(struct qdio_q *q)
836 {
837 	return atomic_read(&q->nr_buf_used) == 0;
838 }
839 
840 static inline int qdio_outbound_q_moved(struct qdio_q *q)
841 {
842 	int bufnr;
843 
844 	bufnr = get_outbound_buffer_frontier(q);
845 
846 	if (bufnr != q->last_move) {
847 		q->last_move = bufnr;
848 		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
849 		return 1;
850 	} else
851 		return 0;
852 }
853 
854 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
855 {
856 	int retries = 0, cc;
857 	unsigned int busy_bit;
858 
859 	if (!need_siga_out(q))
860 		return 0;
861 
862 	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
863 retry:
864 	qperf_inc(q, siga_write);
865 
866 	cc = qdio_siga_output(q, &busy_bit, aob);
867 	switch (cc) {
868 	case 0:
869 		break;
870 	case 2:
871 		if (busy_bit) {
872 			while (++retries < QDIO_BUSY_BIT_RETRIES) {
873 				mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
874 				goto retry;
875 			}
876 			DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
877 			cc = -EBUSY;
878 		} else {
879 			DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
880 			cc = -ENOBUFS;
881 		}
882 		break;
883 	case 1:
884 	case 3:
885 		DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
886 		cc = -EIO;
887 		break;
888 	}
889 	if (retries) {
890 		DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
891 		DBF_ERROR("count:%u", retries);
892 	}
893 	return cc;
894 }
895 
896 static void __qdio_outbound_processing(struct qdio_q *q)
897 {
898 	qperf_inc(q, tasklet_outbound);
899 	WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
900 
901 	if (qdio_outbound_q_moved(q))
902 		qdio_kick_handler(q);
903 
904 	if (queue_type(q) == QDIO_ZFCP_QFMT)
905 		if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
906 			goto sched;
907 
908 	if (q->u.out.pci_out_enabled)
909 		return;
910 
911 	/*
912 	 * Now we know that queue type is either qeth without pci enabled
913 	 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
914 	 * is noticed and outbound_handler is called after some time.
915 	 */
916 	if (qdio_outbound_q_done(q))
917 		del_timer(&q->u.out.timer);
918 	else
919 		if (!timer_pending(&q->u.out.timer))
920 			mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
921 	return;
922 
923 sched:
924 	if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
925 		return;
926 	tasklet_schedule(&q->tasklet);
927 }
928 
929 /* outbound tasklet */
930 void qdio_outbound_processing(unsigned long data)
931 {
932 	struct qdio_q *q = (struct qdio_q *)data;
933 	__qdio_outbound_processing(q);
934 }
935 
936 void qdio_outbound_timer(unsigned long data)
937 {
938 	struct qdio_q *q = (struct qdio_q *)data;
939 
940 	if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
941 		return;
942 	tasklet_schedule(&q->tasklet);
943 }
944 
945 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
946 {
947 	struct qdio_q *out;
948 	int i;
949 
950 	if (!pci_out_supported(q))
951 		return;
952 
953 	for_each_output_queue(q->irq_ptr, out, i)
954 		if (!qdio_outbound_q_done(out))
955 			tasklet_schedule(&out->tasklet);
956 }
957 
958 static void __tiqdio_inbound_processing(struct qdio_q *q)
959 {
960 	qperf_inc(q, tasklet_inbound);
961 	if (need_siga_sync(q) && need_siga_sync_after_ai(q))
962 		qdio_sync_queues(q);
963 
964 	/*
965 	 * The interrupt could be caused by a PCI request. Check the
966 	 * PCI capable outbound queues.
967 	 */
968 	qdio_check_outbound_after_thinint(q);
969 
970 	if (!qdio_inbound_q_moved(q))
971 		return;
972 
973 	qdio_kick_handler(q);
974 
975 	if (!qdio_inbound_q_done(q)) {
976 		qperf_inc(q, tasklet_inbound_resched);
977 		if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
978 			tasklet_schedule(&q->tasklet);
979 			return;
980 		}
981 	}
982 
983 	qdio_stop_polling(q);
984 	/*
985 	 * We need to check again to not lose initiative after
986 	 * resetting the ACK state.
987 	 */
988 	if (!qdio_inbound_q_done(q)) {
989 		qperf_inc(q, tasklet_inbound_resched2);
990 		if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
991 			tasklet_schedule(&q->tasklet);
992 	}
993 }
994 
995 void tiqdio_inbound_processing(unsigned long data)
996 {
997 	struct qdio_q *q = (struct qdio_q *)data;
998 	__tiqdio_inbound_processing(q);
999 }
1000 
1001 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
1002 				  enum qdio_irq_states state)
1003 {
1004 	DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
1005 
1006 	irq_ptr->state = state;
1007 	mb();
1008 }
1009 
1010 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
1011 {
1012 	if (irb->esw.esw0.erw.cons) {
1013 		DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
1014 		DBF_ERROR_HEX(irb, 64);
1015 		DBF_ERROR_HEX(irb->ecw, 64);
1016 	}
1017 }
1018 
1019 /* PCI interrupt handler */
1020 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
1021 {
1022 	int i;
1023 	struct qdio_q *q;
1024 
1025 	if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
1026 		return;
1027 
1028 	for_each_input_queue(irq_ptr, q, i) {
1029 		if (q->u.in.queue_start_poll) {
1030 			/* skip if polling is enabled or already in work */
1031 			if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1032 				     &q->u.in.queue_irq_state)) {
1033 				qperf_inc(q, int_discarded);
1034 				continue;
1035 			}
1036 			q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
1037 						 q->irq_ptr->int_parm);
1038 		} else {
1039 			tasklet_schedule(&q->tasklet);
1040 		}
1041 	}
1042 
1043 	if (!pci_out_supported(q))
1044 		return;
1045 
1046 	for_each_output_queue(irq_ptr, q, i) {
1047 		if (qdio_outbound_q_done(q))
1048 			continue;
1049 		if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1050 			qdio_siga_sync_q(q);
1051 		tasklet_schedule(&q->tasklet);
1052 	}
1053 }
1054 
1055 static void qdio_handle_activate_check(struct ccw_device *cdev,
1056 				unsigned long intparm, int cstat, int dstat)
1057 {
1058 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1059 	struct qdio_q *q;
1060 	int count;
1061 
1062 	DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1063 	DBF_ERROR("intp :%lx", intparm);
1064 	DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1065 
1066 	if (irq_ptr->nr_input_qs) {
1067 		q = irq_ptr->input_qs[0];
1068 	} else if (irq_ptr->nr_output_qs) {
1069 		q = irq_ptr->output_qs[0];
1070 	} else {
1071 		dump_stack();
1072 		goto no_handler;
1073 	}
1074 
1075 	count = sub_buf(q->first_to_check, q->first_to_kick);
1076 	q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1077 		   q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1078 no_handler:
1079 	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1080 	/*
1081 	 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1082 	 * Therefore we call the LGR detection function here.
1083 	 */
1084 	lgr_info_log();
1085 }
1086 
1087 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1088 				      int dstat)
1089 {
1090 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1091 
1092 	DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1093 
1094 	if (cstat)
1095 		goto error;
1096 	if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1097 		goto error;
1098 	if (!(dstat & DEV_STAT_DEV_END))
1099 		goto error;
1100 	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1101 	return;
1102 
1103 error:
1104 	DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1105 	DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1106 	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1107 }
1108 
1109 /* qdio interrupt handler */
1110 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1111 		      struct irb *irb)
1112 {
1113 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1114 	int cstat, dstat;
1115 
1116 	if (!intparm || !irq_ptr) {
1117 		DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1118 		return;
1119 	}
1120 
1121 	if (irq_ptr->perf_stat_enabled)
1122 		irq_ptr->perf_stat.qdio_int++;
1123 
1124 	if (IS_ERR(irb)) {
1125 		DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1126 		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1127 		wake_up(&cdev->private->wait_q);
1128 		return;
1129 	}
1130 	qdio_irq_check_sense(irq_ptr, irb);
1131 	cstat = irb->scsw.cmd.cstat;
1132 	dstat = irb->scsw.cmd.dstat;
1133 
1134 	switch (irq_ptr->state) {
1135 	case QDIO_IRQ_STATE_INACTIVE:
1136 		qdio_establish_handle_irq(cdev, cstat, dstat);
1137 		break;
1138 	case QDIO_IRQ_STATE_CLEANUP:
1139 		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1140 		break;
1141 	case QDIO_IRQ_STATE_ESTABLISHED:
1142 	case QDIO_IRQ_STATE_ACTIVE:
1143 		if (cstat & SCHN_STAT_PCI) {
1144 			qdio_int_handler_pci(irq_ptr);
1145 			return;
1146 		}
1147 		if (cstat || dstat)
1148 			qdio_handle_activate_check(cdev, intparm, cstat,
1149 						   dstat);
1150 		break;
1151 	case QDIO_IRQ_STATE_STOPPED:
1152 		break;
1153 	default:
1154 		WARN_ON_ONCE(1);
1155 	}
1156 	wake_up(&cdev->private->wait_q);
1157 }
1158 
1159 /**
1160  * qdio_get_ssqd_desc - get qdio subchannel description
1161  * @cdev: ccw device to get description for
1162  * @data: where to store the ssqd
1163  *
1164  * Returns 0 or an error code. The results of the chsc are stored in the
1165  * specified structure.
1166  */
1167 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1168 		       struct qdio_ssqd_desc *data)
1169 {
1170 
1171 	if (!cdev || !cdev->private)
1172 		return -EINVAL;
1173 
1174 	DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1175 	return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1176 }
1177 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1178 
1179 static void qdio_shutdown_queues(struct ccw_device *cdev)
1180 {
1181 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1182 	struct qdio_q *q;
1183 	int i;
1184 
1185 	for_each_input_queue(irq_ptr, q, i)
1186 		tasklet_kill(&q->tasklet);
1187 
1188 	for_each_output_queue(irq_ptr, q, i) {
1189 		del_timer(&q->u.out.timer);
1190 		tasklet_kill(&q->tasklet);
1191 	}
1192 }
1193 
1194 /**
1195  * qdio_shutdown - shut down a qdio subchannel
1196  * @cdev: associated ccw device
1197  * @how: use halt or clear to shutdown
1198  */
1199 int qdio_shutdown(struct ccw_device *cdev, int how)
1200 {
1201 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1202 	int rc;
1203 	unsigned long flags;
1204 
1205 	if (!irq_ptr)
1206 		return -ENODEV;
1207 
1208 	WARN_ON_ONCE(irqs_disabled());
1209 	DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1210 
1211 	mutex_lock(&irq_ptr->setup_mutex);
1212 	/*
1213 	 * Subchannel was already shot down. We cannot prevent being called
1214 	 * twice since cio may trigger a shutdown asynchronously.
1215 	 */
1216 	if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1217 		mutex_unlock(&irq_ptr->setup_mutex);
1218 		return 0;
1219 	}
1220 
1221 	/*
1222 	 * Indicate that the device is going down. Scheduling the queue
1223 	 * tasklets is forbidden from here on.
1224 	 */
1225 	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1226 
1227 	tiqdio_remove_input_queues(irq_ptr);
1228 	qdio_shutdown_queues(cdev);
1229 	qdio_shutdown_debug_entries(irq_ptr, cdev);
1230 
1231 	/* cleanup subchannel */
1232 	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1233 
1234 	if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1235 		rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1236 	else
1237 		/* default behaviour is halt */
1238 		rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1239 	if (rc) {
1240 		DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1241 		DBF_ERROR("rc:%4d", rc);
1242 		goto no_cleanup;
1243 	}
1244 
1245 	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1246 	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1247 	wait_event_interruptible_timeout(cdev->private->wait_q,
1248 		irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1249 		irq_ptr->state == QDIO_IRQ_STATE_ERR,
1250 		10 * HZ);
1251 	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1252 
1253 no_cleanup:
1254 	qdio_shutdown_thinint(irq_ptr);
1255 
1256 	/* restore interrupt handler */
1257 	if ((void *)cdev->handler == (void *)qdio_int_handler)
1258 		cdev->handler = irq_ptr->orig_handler;
1259 	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1260 
1261 	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1262 	mutex_unlock(&irq_ptr->setup_mutex);
1263 	if (rc)
1264 		return rc;
1265 	return 0;
1266 }
1267 EXPORT_SYMBOL_GPL(qdio_shutdown);
1268 
1269 /**
1270  * qdio_free - free data structures for a qdio subchannel
1271  * @cdev: associated ccw device
1272  */
1273 int qdio_free(struct ccw_device *cdev)
1274 {
1275 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1276 
1277 	if (!irq_ptr)
1278 		return -ENODEV;
1279 
1280 	DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1281 	mutex_lock(&irq_ptr->setup_mutex);
1282 
1283 	if (irq_ptr->debug_area != NULL) {
1284 		debug_unregister(irq_ptr->debug_area);
1285 		irq_ptr->debug_area = NULL;
1286 	}
1287 	cdev->private->qdio_data = NULL;
1288 	mutex_unlock(&irq_ptr->setup_mutex);
1289 
1290 	qdio_release_memory(irq_ptr);
1291 	return 0;
1292 }
1293 EXPORT_SYMBOL_GPL(qdio_free);
1294 
1295 /**
1296  * qdio_allocate - allocate qdio queues and associated data
1297  * @init_data: initialization data
1298  */
1299 int qdio_allocate(struct qdio_initialize *init_data)
1300 {
1301 	struct qdio_irq *irq_ptr;
1302 
1303 	DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1304 
1305 	if ((init_data->no_input_qs && !init_data->input_handler) ||
1306 	    (init_data->no_output_qs && !init_data->output_handler))
1307 		return -EINVAL;
1308 
1309 	if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1310 	    (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1311 		return -EINVAL;
1312 
1313 	if ((!init_data->input_sbal_addr_array) ||
1314 	    (!init_data->output_sbal_addr_array))
1315 		return -EINVAL;
1316 
1317 	/* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1318 	irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1319 	if (!irq_ptr)
1320 		goto out_err;
1321 
1322 	mutex_init(&irq_ptr->setup_mutex);
1323 	qdio_allocate_dbf(init_data, irq_ptr);
1324 
1325 	/*
1326 	 * Allocate a page for the chsc calls in qdio_establish.
1327 	 * Must be pre-allocated since a zfcp recovery will call
1328 	 * qdio_establish. In case of low memory and swap on a zfcp disk
1329 	 * we may not be able to allocate memory otherwise.
1330 	 */
1331 	irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1332 	if (!irq_ptr->chsc_page)
1333 		goto out_rel;
1334 
1335 	/* qdr is used in ccw1.cda which is u32 */
1336 	irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1337 	if (!irq_ptr->qdr)
1338 		goto out_rel;
1339 
1340 	if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1341 			     init_data->no_output_qs))
1342 		goto out_rel;
1343 
1344 	init_data->cdev->private->qdio_data = irq_ptr;
1345 	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1346 	return 0;
1347 out_rel:
1348 	qdio_release_memory(irq_ptr);
1349 out_err:
1350 	return -ENOMEM;
1351 }
1352 EXPORT_SYMBOL_GPL(qdio_allocate);
1353 
1354 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1355 {
1356 	struct qdio_q *q = irq_ptr->input_qs[0];
1357 	int i, use_cq = 0;
1358 
1359 	if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1360 		use_cq = 1;
1361 
1362 	for_each_output_queue(irq_ptr, q, i) {
1363 		if (use_cq) {
1364 			if (qdio_enable_async_operation(&q->u.out) < 0) {
1365 				use_cq = 0;
1366 				continue;
1367 			}
1368 		} else
1369 			qdio_disable_async_operation(&q->u.out);
1370 	}
1371 	DBF_EVENT("use_cq:%d", use_cq);
1372 }
1373 
1374 /**
1375  * qdio_establish - establish queues on a qdio subchannel
1376  * @init_data: initialization data
1377  */
1378 int qdio_establish(struct qdio_initialize *init_data)
1379 {
1380 	struct qdio_irq *irq_ptr;
1381 	struct ccw_device *cdev = init_data->cdev;
1382 	unsigned long saveflags;
1383 	int rc;
1384 
1385 	DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1386 
1387 	irq_ptr = cdev->private->qdio_data;
1388 	if (!irq_ptr)
1389 		return -ENODEV;
1390 
1391 	if (cdev->private->state != DEV_STATE_ONLINE)
1392 		return -EINVAL;
1393 
1394 	mutex_lock(&irq_ptr->setup_mutex);
1395 	qdio_setup_irq(init_data);
1396 
1397 	rc = qdio_establish_thinint(irq_ptr);
1398 	if (rc) {
1399 		mutex_unlock(&irq_ptr->setup_mutex);
1400 		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1401 		return rc;
1402 	}
1403 
1404 	/* establish q */
1405 	irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1406 	irq_ptr->ccw.flags = CCW_FLAG_SLI;
1407 	irq_ptr->ccw.count = irq_ptr->equeue.count;
1408 	irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1409 
1410 	spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1411 	ccw_device_set_options_mask(cdev, 0);
1412 
1413 	rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1414 	if (rc) {
1415 		DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1416 		DBF_ERROR("rc:%4x", rc);
1417 	}
1418 	spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1419 
1420 	if (rc) {
1421 		mutex_unlock(&irq_ptr->setup_mutex);
1422 		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1423 		return rc;
1424 	}
1425 
1426 	wait_event_interruptible_timeout(cdev->private->wait_q,
1427 		irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1428 		irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1429 
1430 	if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1431 		mutex_unlock(&irq_ptr->setup_mutex);
1432 		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1433 		return -EIO;
1434 	}
1435 
1436 	qdio_setup_ssqd_info(irq_ptr);
1437 
1438 	qdio_detect_hsicq(irq_ptr);
1439 
1440 	/* qebsm is now setup if available, initialize buffer states */
1441 	qdio_init_buf_states(irq_ptr);
1442 
1443 	mutex_unlock(&irq_ptr->setup_mutex);
1444 	qdio_print_subchannel_info(irq_ptr, cdev);
1445 	qdio_setup_debug_entries(irq_ptr, cdev);
1446 	return 0;
1447 }
1448 EXPORT_SYMBOL_GPL(qdio_establish);
1449 
1450 /**
1451  * qdio_activate - activate queues on a qdio subchannel
1452  * @cdev: associated cdev
1453  */
1454 int qdio_activate(struct ccw_device *cdev)
1455 {
1456 	struct qdio_irq *irq_ptr;
1457 	int rc;
1458 	unsigned long saveflags;
1459 
1460 	DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1461 
1462 	irq_ptr = cdev->private->qdio_data;
1463 	if (!irq_ptr)
1464 		return -ENODEV;
1465 
1466 	if (cdev->private->state != DEV_STATE_ONLINE)
1467 		return -EINVAL;
1468 
1469 	mutex_lock(&irq_ptr->setup_mutex);
1470 	if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1471 		rc = -EBUSY;
1472 		goto out;
1473 	}
1474 
1475 	irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1476 	irq_ptr->ccw.flags = CCW_FLAG_SLI;
1477 	irq_ptr->ccw.count = irq_ptr->aqueue.count;
1478 	irq_ptr->ccw.cda = 0;
1479 
1480 	spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1481 	ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1482 
1483 	rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1484 			      0, DOIO_DENY_PREFETCH);
1485 	if (rc) {
1486 		DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1487 		DBF_ERROR("rc:%4x", rc);
1488 	}
1489 	spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1490 
1491 	if (rc)
1492 		goto out;
1493 
1494 	if (is_thinint_irq(irq_ptr))
1495 		tiqdio_add_input_queues(irq_ptr);
1496 
1497 	/* wait for subchannel to become active */
1498 	msleep(5);
1499 
1500 	switch (irq_ptr->state) {
1501 	case QDIO_IRQ_STATE_STOPPED:
1502 	case QDIO_IRQ_STATE_ERR:
1503 		rc = -EIO;
1504 		break;
1505 	default:
1506 		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1507 		rc = 0;
1508 	}
1509 out:
1510 	mutex_unlock(&irq_ptr->setup_mutex);
1511 	return rc;
1512 }
1513 EXPORT_SYMBOL_GPL(qdio_activate);
1514 
1515 static inline int buf_in_between(int bufnr, int start, int count)
1516 {
1517 	int end = add_buf(start, count);
1518 
1519 	if (end > start) {
1520 		if (bufnr >= start && bufnr < end)
1521 			return 1;
1522 		else
1523 			return 0;
1524 	}
1525 
1526 	/* wrap-around case */
1527 	if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1528 	    (bufnr < end))
1529 		return 1;
1530 	else
1531 		return 0;
1532 }
1533 
1534 /**
1535  * handle_inbound - reset processed input buffers
1536  * @q: queue containing the buffers
1537  * @callflags: flags
1538  * @bufnr: first buffer to process
1539  * @count: how many buffers are emptied
1540  */
1541 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1542 			  int bufnr, int count)
1543 {
1544 	int used, diff;
1545 
1546 	qperf_inc(q, inbound_call);
1547 
1548 	if (!q->u.in.polling)
1549 		goto set;
1550 
1551 	/* protect against stop polling setting an ACK for an emptied slsb */
1552 	if (count == QDIO_MAX_BUFFERS_PER_Q) {
1553 		/* overwriting everything, just delete polling status */
1554 		q->u.in.polling = 0;
1555 		q->u.in.ack_count = 0;
1556 		goto set;
1557 	} else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1558 		if (is_qebsm(q)) {
1559 			/* partial overwrite, just update ack_start */
1560 			diff = add_buf(bufnr, count);
1561 			diff = sub_buf(diff, q->u.in.ack_start);
1562 			q->u.in.ack_count -= diff;
1563 			if (q->u.in.ack_count <= 0) {
1564 				q->u.in.polling = 0;
1565 				q->u.in.ack_count = 0;
1566 				goto set;
1567 			}
1568 			q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1569 		}
1570 		else
1571 			/* the only ACK will be deleted, so stop polling */
1572 			q->u.in.polling = 0;
1573 	}
1574 
1575 set:
1576 	count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1577 	used = atomic_add_return(count, &q->nr_buf_used) - count;
1578 
1579 	if (need_siga_in(q))
1580 		return qdio_siga_input(q);
1581 
1582 	return 0;
1583 }
1584 
1585 /**
1586  * handle_outbound - process filled outbound buffers
1587  * @q: queue containing the buffers
1588  * @callflags: flags
1589  * @bufnr: first buffer to process
1590  * @count: how many buffers are filled
1591  */
1592 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1593 			   int bufnr, int count)
1594 {
1595 	unsigned char state = 0;
1596 	int used, rc = 0;
1597 
1598 	qperf_inc(q, outbound_call);
1599 
1600 	count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1601 	used = atomic_add_return(count, &q->nr_buf_used);
1602 
1603 	if (used == QDIO_MAX_BUFFERS_PER_Q)
1604 		qperf_inc(q, outbound_queue_full);
1605 
1606 	if (callflags & QDIO_FLAG_PCI_OUT) {
1607 		q->u.out.pci_out_enabled = 1;
1608 		qperf_inc(q, pci_request_int);
1609 	} else
1610 		q->u.out.pci_out_enabled = 0;
1611 
1612 	if (queue_type(q) == QDIO_IQDIO_QFMT) {
1613 		unsigned long phys_aob = 0;
1614 
1615 		/* One SIGA-W per buffer required for unicast HSI */
1616 		WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1617 
1618 		phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1619 
1620 		rc = qdio_kick_outbound_q(q, phys_aob);
1621 	} else if (need_siga_sync(q)) {
1622 		rc = qdio_siga_sync_q(q);
1623 	} else {
1624 		/* try to fast requeue buffers */
1625 		get_buf_state(q, prev_buf(bufnr), &state, 0);
1626 		if (state != SLSB_CU_OUTPUT_PRIMED)
1627 			rc = qdio_kick_outbound_q(q, 0);
1628 		else
1629 			qperf_inc(q, fast_requeue);
1630 	}
1631 
1632 	/* in case of SIGA errors we must process the error immediately */
1633 	if (used >= q->u.out.scan_threshold || rc)
1634 		tasklet_schedule(&q->tasklet);
1635 	else
1636 		/* free the SBALs in case of no further traffic */
1637 		if (!timer_pending(&q->u.out.timer))
1638 			mod_timer(&q->u.out.timer, jiffies + HZ);
1639 	return rc;
1640 }
1641 
1642 /**
1643  * do_QDIO - process input or output buffers
1644  * @cdev: associated ccw_device for the qdio subchannel
1645  * @callflags: input or output and special flags from the program
1646  * @q_nr: queue number
1647  * @bufnr: buffer number
1648  * @count: how many buffers to process
1649  */
1650 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1651 	    int q_nr, unsigned int bufnr, unsigned int count)
1652 {
1653 	struct qdio_irq *irq_ptr;
1654 
1655 	if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1656 		return -EINVAL;
1657 
1658 	irq_ptr = cdev->private->qdio_data;
1659 	if (!irq_ptr)
1660 		return -ENODEV;
1661 
1662 	DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1663 		      "do%02x b:%02x c:%02x", callflags, bufnr, count);
1664 
1665 	if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1666 		return -EIO;
1667 	if (!count)
1668 		return 0;
1669 	if (callflags & QDIO_FLAG_SYNC_INPUT)
1670 		return handle_inbound(irq_ptr->input_qs[q_nr],
1671 				      callflags, bufnr, count);
1672 	else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1673 		return handle_outbound(irq_ptr->output_qs[q_nr],
1674 				       callflags, bufnr, count);
1675 	return -EINVAL;
1676 }
1677 EXPORT_SYMBOL_GPL(do_QDIO);
1678 
1679 /**
1680  * qdio_start_irq - process input buffers
1681  * @cdev: associated ccw_device for the qdio subchannel
1682  * @nr: input queue number
1683  *
1684  * Return codes
1685  *   0 - success
1686  *   1 - irqs not started since new data is available
1687  */
1688 int qdio_start_irq(struct ccw_device *cdev, int nr)
1689 {
1690 	struct qdio_q *q;
1691 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1692 
1693 	if (!irq_ptr)
1694 		return -ENODEV;
1695 	q = irq_ptr->input_qs[nr];
1696 
1697 	clear_nonshared_ind(irq_ptr);
1698 	qdio_stop_polling(q);
1699 	clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1700 
1701 	/*
1702 	 * We need to check again to not lose initiative after
1703 	 * resetting the ACK state.
1704 	 */
1705 	if (test_nonshared_ind(irq_ptr))
1706 		goto rescan;
1707 	if (!qdio_inbound_q_done(q))
1708 		goto rescan;
1709 	return 0;
1710 
1711 rescan:
1712 	if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1713 			     &q->u.in.queue_irq_state))
1714 		return 0;
1715 	else
1716 		return 1;
1717 
1718 }
1719 EXPORT_SYMBOL(qdio_start_irq);
1720 
1721 /**
1722  * qdio_get_next_buffers - process input buffers
1723  * @cdev: associated ccw_device for the qdio subchannel
1724  * @nr: input queue number
1725  * @bufnr: first filled buffer number
1726  * @error: buffers are in error state
1727  *
1728  * Return codes
1729  *   < 0 - error
1730  *   = 0 - no new buffers found
1731  *   > 0 - number of processed buffers
1732  */
1733 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1734 			  int *error)
1735 {
1736 	struct qdio_q *q;
1737 	int start, end;
1738 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1739 
1740 	if (!irq_ptr)
1741 		return -ENODEV;
1742 	q = irq_ptr->input_qs[nr];
1743 
1744 	/*
1745 	 * Cannot rely on automatic sync after interrupt since queues may
1746 	 * also be examined without interrupt.
1747 	 */
1748 	if (need_siga_sync(q))
1749 		qdio_sync_queues(q);
1750 
1751 	/* check the PCI capable outbound queues. */
1752 	qdio_check_outbound_after_thinint(q);
1753 
1754 	if (!qdio_inbound_q_moved(q))
1755 		return 0;
1756 
1757 	/* Note: upper-layer MUST stop processing immediately here ... */
1758 	if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1759 		return -EIO;
1760 
1761 	start = q->first_to_kick;
1762 	end = q->first_to_check;
1763 	*bufnr = start;
1764 	*error = q->qdio_error;
1765 
1766 	/* for the next time */
1767 	q->first_to_kick = end;
1768 	q->qdio_error = 0;
1769 	return sub_buf(end, start);
1770 }
1771 EXPORT_SYMBOL(qdio_get_next_buffers);
1772 
1773 /**
1774  * qdio_stop_irq - disable interrupt processing for the device
1775  * @cdev: associated ccw_device for the qdio subchannel
1776  * @nr: input queue number
1777  *
1778  * Return codes
1779  *   0 - interrupts were already disabled
1780  *   1 - interrupts successfully disabled
1781  */
1782 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1783 {
1784 	struct qdio_q *q;
1785 	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1786 
1787 	if (!irq_ptr)
1788 		return -ENODEV;
1789 	q = irq_ptr->input_qs[nr];
1790 
1791 	if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1792 			     &q->u.in.queue_irq_state))
1793 		return 0;
1794 	else
1795 		return 1;
1796 }
1797 EXPORT_SYMBOL(qdio_stop_irq);
1798 
1799 static int __init init_QDIO(void)
1800 {
1801 	int rc;
1802 
1803 	rc = qdio_debug_init();
1804 	if (rc)
1805 		return rc;
1806 	rc = qdio_setup_init();
1807 	if (rc)
1808 		goto out_debug;
1809 	rc = tiqdio_allocate_memory();
1810 	if (rc)
1811 		goto out_cache;
1812 	rc = tiqdio_register_thinints();
1813 	if (rc)
1814 		goto out_ti;
1815 	return 0;
1816 
1817 out_ti:
1818 	tiqdio_free_memory();
1819 out_cache:
1820 	qdio_setup_exit();
1821 out_debug:
1822 	qdio_debug_exit();
1823 	return rc;
1824 }
1825 
1826 static void __exit exit_QDIO(void)
1827 {
1828 	tiqdio_unregister_thinints();
1829 	tiqdio_free_memory();
1830 	qdio_setup_exit();
1831 	qdio_debug_exit();
1832 }
1833 
1834 module_init(init_QDIO);
1835 module_exit(exit_QDIO);
1836