[S390] qdio: outbound tasklet scan threshold
[linux-2.6.git] / drivers / s390 / cio / qdio_main.c
1 /*
2  * linux/drivers/s390/cio/qdio_main.c
3  *
4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
5  *
6  * Copyright 2000,2008 IBM Corp.
7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
8  *            Jan Glauber <jang@linux.vnet.ibm.com>
9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
10  */
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/timer.h>
15 #include <linux/delay.h>
16 #include <linux/gfp.h>
17 #include <linux/kernel_stat.h>
18 #include <asm/atomic.h>
19 #include <asm/debug.h>
20 #include <asm/qdio.h>
21
22 #include "cio.h"
23 #include "css.h"
24 #include "device.h"
25 #include "qdio.h"
26 #include "qdio_debug.h"
27
28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
29         "Jan Glauber <jang@linux.vnet.ibm.com>");
30 MODULE_DESCRIPTION("QDIO base support");
31 MODULE_LICENSE("GPL");
32
33 static inline int do_siga_sync(struct subchannel_id schid,
34                                unsigned int out_mask, unsigned int in_mask)
35 {
36         register unsigned long __fc asm ("0") = 2;
37         register struct subchannel_id __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(struct subchannel_id schid, unsigned int mask)
52 {
53         register unsigned long __fc asm ("0") = 1;
54         register struct subchannel_id __schid asm ("1") = schid;
55         register unsigned long __mask asm ("2") = mask;
56         int cc;
57
58         asm volatile(
59                 "       siga    0\n"
60                 "       ipm     %0\n"
61                 "       srl     %0,28\n"
62                 : "=d" (cc)
63                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
64         return cc;
65 }
66
67 /**
68  * do_siga_output - perform SIGA-w/wt function
69  * @schid: subchannel id or in case of QEBSM the subchannel token
70  * @mask: which output queues to process
71  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
72  * @fc: function code to perform
73  *
74  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
75  * Note: For IQDC unicast queues only the highest priority queue is processed.
76  */
77 static inline int do_siga_output(unsigned long schid, unsigned long mask,
78                                  unsigned int *bb, unsigned int fc)
79 {
80         register unsigned long __fc asm("0") = fc;
81         register unsigned long __schid asm("1") = schid;
82         register unsigned long __mask asm("2") = mask;
83         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
84
85         asm volatile(
86                 "       siga    0\n"
87                 "0:     ipm     %0\n"
88                 "       srl     %0,28\n"
89                 "1:\n"
90                 EX_TABLE(0b, 1b)
91                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
92                 : : "cc", "memory");
93         *bb = ((unsigned int) __fc) >> 31;
94         return cc;
95 }
96
97 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
98 {
99         /* all done or next buffer state different */
100         if (ccq == 0 || ccq == 32)
101                 return 0;
102         /* not all buffers processed */
103         if (ccq == 96 || ccq == 97)
104                 return 1;
105         /* notify devices immediately */
106         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
107         return -EIO;
108 }
109
110 /**
111  * qdio_do_eqbs - extract buffer states for QEBSM
112  * @q: queue to manipulate
113  * @state: state of the extracted buffers
114  * @start: buffer number to start at
115  * @count: count of buffers to examine
116  * @auto_ack: automatically acknowledge buffers
117  *
118  * Returns the number of successfully extracted equal buffer states.
119  * Stops processing if a state is different from the last buffers state.
120  */
121 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
122                         int start, int count, int auto_ack)
123 {
124         unsigned int ccq = 0;
125         int tmp_count = count, tmp_start = start;
126         int nr = q->nr;
127         int rc;
128
129         BUG_ON(!q->irq_ptr->sch_token);
130         qperf_inc(q, eqbs);
131
132         if (!q->is_input_q)
133                 nr += q->irq_ptr->nr_input_qs;
134 again:
135         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
136                       auto_ack);
137         rc = qdio_check_ccq(q, ccq);
138
139         /* At least one buffer was processed, return and extract the remaining
140          * buffers later.
141          */
142         if ((ccq == 96) && (count != tmp_count)) {
143                 qperf_inc(q, eqbs_partial);
144                 return (count - tmp_count);
145         }
146
147         if (rc == 1) {
148                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
149                 goto again;
150         }
151
152         if (rc < 0) {
153                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
154                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
155                 q->handler(q->irq_ptr->cdev,
156                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
157                            0, -1, -1, q->irq_ptr->int_parm);
158                 return 0;
159         }
160         return count - tmp_count;
161 }
162
163 /**
164  * qdio_do_sqbs - set buffer states for QEBSM
165  * @q: queue to manipulate
166  * @state: new state of the buffers
167  * @start: first buffer number to change
168  * @count: how many buffers to change
169  *
170  * Returns the number of successfully changed buffers.
171  * Does retrying until the specified count of buffer states is set or an
172  * error occurs.
173  */
174 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
175                         int count)
176 {
177         unsigned int ccq = 0;
178         int tmp_count = count, tmp_start = start;
179         int nr = q->nr;
180         int rc;
181
182         if (!count)
183                 return 0;
184
185         BUG_ON(!q->irq_ptr->sch_token);
186         qperf_inc(q, sqbs);
187
188         if (!q->is_input_q)
189                 nr += q->irq_ptr->nr_input_qs;
190 again:
191         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
192         rc = qdio_check_ccq(q, ccq);
193         if (rc == 1) {
194                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
195                 qperf_inc(q, sqbs_partial);
196                 goto again;
197         }
198         if (rc < 0) {
199                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
200                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
201                 q->handler(q->irq_ptr->cdev,
202                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
203                            0, -1, -1, q->irq_ptr->int_parm);
204                 return 0;
205         }
206         WARN_ON(tmp_count);
207         return count - tmp_count;
208 }
209
210 /* returns number of examined buffers and their common state in *state */
211 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
212                                  unsigned char *state, unsigned int count,
213                                  int auto_ack)
214 {
215         unsigned char __state = 0;
216         int i;
217
218         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
219         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
220
221         if (is_qebsm(q))
222                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
223
224         for (i = 0; i < count; i++) {
225                 if (!__state)
226                         __state = q->slsb.val[bufnr];
227                 else if (q->slsb.val[bufnr] != __state)
228                         break;
229                 bufnr = next_buf(bufnr);
230         }
231         *state = __state;
232         return i;
233 }
234
235 static 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, 1, auto_ack);
239 }
240
241 /* wrap-around safe setting of slsb states, returns number of changed buffers */
242 static inline int set_buf_states(struct qdio_q *q, int bufnr,
243                                  unsigned char state, int count)
244 {
245         int i;
246
247         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
248         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
249
250         if (is_qebsm(q))
251                 return qdio_do_sqbs(q, state, bufnr, count);
252
253         for (i = 0; i < count; i++) {
254                 xchg(&q->slsb.val[bufnr], state);
255                 bufnr = next_buf(bufnr);
256         }
257         return count;
258 }
259
260 static inline int set_buf_state(struct qdio_q *q, int bufnr,
261                                 unsigned char state)
262 {
263         return set_buf_states(q, bufnr, state, 1);
264 }
265
266 /* set slsb states to initial state */
267 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
268 {
269         struct qdio_q *q;
270         int i;
271
272         for_each_input_queue(irq_ptr, q, i)
273                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
274                                QDIO_MAX_BUFFERS_PER_Q);
275         for_each_output_queue(irq_ptr, q, i)
276                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
277                                QDIO_MAX_BUFFERS_PER_Q);
278 }
279
280 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
281                           unsigned int input)
282 {
283         int cc;
284
285         if (!need_siga_sync(q))
286                 return 0;
287
288         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
289         qperf_inc(q, siga_sync);
290
291         cc = do_siga_sync(q->irq_ptr->schid, output, input);
292         if (cc)
293                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
294         return cc;
295 }
296
297 static inline int qdio_siga_sync_q(struct qdio_q *q)
298 {
299         if (q->is_input_q)
300                 return qdio_siga_sync(q, 0, q->mask);
301         else
302                 return qdio_siga_sync(q, q->mask, 0);
303 }
304
305 static inline int qdio_siga_sync_out(struct qdio_q *q)
306 {
307         return qdio_siga_sync(q, ~0U, 0);
308 }
309
310 static inline int qdio_siga_sync_all(struct qdio_q *q)
311 {
312         return qdio_siga_sync(q, ~0U, ~0U);
313 }
314
315 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
316 {
317         unsigned long schid;
318         unsigned int fc = 0;
319         u64 start_time = 0;
320         int cc;
321
322         if (q->u.out.use_enh_siga)
323                 fc = 3;
324
325         if (is_qebsm(q)) {
326                 schid = q->irq_ptr->sch_token;
327                 fc |= 0x80;
328         }
329         else
330                 schid = *((u32 *)&q->irq_ptr->schid);
331
332 again:
333         cc = do_siga_output(schid, q->mask, busy_bit, fc);
334
335         /* hipersocket busy condition */
336         if (*busy_bit) {
337                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
338
339                 if (!start_time) {
340                         start_time = get_clock();
341                         goto again;
342                 }
343                 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
344                         goto again;
345         }
346         return cc;
347 }
348
349 static inline int qdio_siga_input(struct qdio_q *q)
350 {
351         int cc;
352
353         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
354         qperf_inc(q, siga_read);
355
356         cc = do_siga_input(q->irq_ptr->schid, q->mask);
357         if (cc)
358                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
359         return cc;
360 }
361
362 static inline void qdio_sync_after_thinint(struct qdio_q *q)
363 {
364         if (pci_out_supported(q)) {
365                 if (need_siga_sync_thinint(q))
366                         qdio_siga_sync_all(q);
367                 else if (need_siga_sync_out_thinint(q))
368                         qdio_siga_sync_out(q);
369         } else
370                 qdio_siga_sync_q(q);
371 }
372
373 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
374                         unsigned char *state)
375 {
376         qdio_siga_sync_q(q);
377         return get_buf_states(q, bufnr, state, 1, 0);
378 }
379
380 static inline void qdio_stop_polling(struct qdio_q *q)
381 {
382         if (!q->u.in.polling)
383                 return;
384
385         q->u.in.polling = 0;
386         qperf_inc(q, stop_polling);
387
388         /* show the card that we are not polling anymore */
389         if (is_qebsm(q)) {
390                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
391                                q->u.in.ack_count);
392                 q->u.in.ack_count = 0;
393         } else
394                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
395 }
396
397 static inline void account_sbals(struct qdio_q *q, int count)
398 {
399         int pos = 0;
400
401         q->q_stats.nr_sbal_total += count;
402         if (count == QDIO_MAX_BUFFERS_MASK) {
403                 q->q_stats.nr_sbals[7]++;
404                 return;
405         }
406         while (count >>= 1)
407                 pos++;
408         q->q_stats.nr_sbals[pos]++;
409 }
410
411 static void announce_buffer_error(struct qdio_q *q, int count)
412 {
413         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
414
415         /* special handling for no target buffer empty */
416         if ((!q->is_input_q &&
417             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
418                 qperf_inc(q, target_full);
419                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
420                               q->first_to_check);
421                 return;
422         }
423
424         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
425         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
426         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
427         DBF_ERROR("F14:%2x F15:%2x",
428                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
429                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
430 }
431
432 static inline void inbound_primed(struct qdio_q *q, int count)
433 {
434         int new;
435
436         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
437
438         /* for QEBSM the ACK was already set by EQBS */
439         if (is_qebsm(q)) {
440                 if (!q->u.in.polling) {
441                         q->u.in.polling = 1;
442                         q->u.in.ack_count = count;
443                         q->u.in.ack_start = q->first_to_check;
444                         return;
445                 }
446
447                 /* delete the previous ACK's */
448                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
449                                q->u.in.ack_count);
450                 q->u.in.ack_count = count;
451                 q->u.in.ack_start = q->first_to_check;
452                 return;
453         }
454
455         /*
456          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
457          * or by the next inbound run.
458          */
459         new = add_buf(q->first_to_check, count - 1);
460         if (q->u.in.polling) {
461                 /* reset the previous ACK but first set the new one */
462                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
463                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
464         } else {
465                 q->u.in.polling = 1;
466                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
467         }
468
469         q->u.in.ack_start = new;
470         count--;
471         if (!count)
472                 return;
473         /* need to change ALL buffers to get more interrupts */
474         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
475 }
476
477 static int get_inbound_buffer_frontier(struct qdio_q *q)
478 {
479         int count, stop;
480         unsigned char state;
481
482         /*
483          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
484          * would return 0.
485          */
486         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
487         stop = add_buf(q->first_to_check, count);
488
489         if (q->first_to_check == stop)
490                 goto out;
491
492         /*
493          * No siga sync here, as a PCI or we after a thin interrupt
494          * already sync'ed the queues.
495          */
496         count = get_buf_states(q, q->first_to_check, &state, count, 1);
497         if (!count)
498                 goto out;
499
500         switch (state) {
501         case SLSB_P_INPUT_PRIMED:
502                 inbound_primed(q, count);
503                 q->first_to_check = add_buf(q->first_to_check, count);
504                 if (atomic_sub(count, &q->nr_buf_used) == 0)
505                         qperf_inc(q, inbound_queue_full);
506                 if (q->irq_ptr->perf_stat_enabled)
507                         account_sbals(q, count);
508                 break;
509         case SLSB_P_INPUT_ERROR:
510                 announce_buffer_error(q, count);
511                 /* process the buffer, the upper layer will take care of it */
512                 q->first_to_check = add_buf(q->first_to_check, count);
513                 atomic_sub(count, &q->nr_buf_used);
514                 if (q->irq_ptr->perf_stat_enabled)
515                         account_sbals_error(q, count);
516                 break;
517         case SLSB_CU_INPUT_EMPTY:
518         case SLSB_P_INPUT_NOT_INIT:
519         case SLSB_P_INPUT_ACK:
520                 if (q->irq_ptr->perf_stat_enabled)
521                         q->q_stats.nr_sbal_nop++;
522                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
523                 break;
524         default:
525                 BUG();
526         }
527 out:
528         return q->first_to_check;
529 }
530
531 static int qdio_inbound_q_moved(struct qdio_q *q)
532 {
533         int bufnr;
534
535         bufnr = get_inbound_buffer_frontier(q);
536
537         if ((bufnr != q->last_move) || q->qdio_error) {
538                 q->last_move = bufnr;
539                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
540                         q->u.in.timestamp = get_clock();
541                 return 1;
542         } else
543                 return 0;
544 }
545
546 static inline int qdio_inbound_q_done(struct qdio_q *q)
547 {
548         unsigned char state = 0;
549
550         if (!atomic_read(&q->nr_buf_used))
551                 return 1;
552
553         qdio_siga_sync_q(q);
554         get_buf_state(q, q->first_to_check, &state, 0);
555
556         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
557                 /* more work coming */
558                 return 0;
559
560         if (is_thinint_irq(q->irq_ptr))
561                 return 1;
562
563         /* don't poll under z/VM */
564         if (MACHINE_IS_VM)
565                 return 1;
566
567         /*
568          * At this point we know, that inbound first_to_check
569          * has (probably) not moved (see qdio_inbound_processing).
570          */
571         if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
572                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
573                               q->first_to_check);
574                 return 1;
575         } else
576                 return 0;
577 }
578
579 static void qdio_kick_handler(struct qdio_q *q)
580 {
581         int start = q->first_to_kick;
582         int end = q->first_to_check;
583         int count;
584
585         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
586                 return;
587
588         count = sub_buf(end, start);
589
590         if (q->is_input_q) {
591                 qperf_inc(q, inbound_handler);
592                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
593         } else {
594                 qperf_inc(q, outbound_handler);
595                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
596                               start, count);
597         }
598
599         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
600                    q->irq_ptr->int_parm);
601
602         /* for the next time */
603         q->first_to_kick = end;
604         q->qdio_error = 0;
605 }
606
607 static void __qdio_inbound_processing(struct qdio_q *q)
608 {
609         qperf_inc(q, tasklet_inbound);
610
611         if (!qdio_inbound_q_moved(q))
612                 return;
613
614         qdio_kick_handler(q);
615
616         if (!qdio_inbound_q_done(q)) {
617                 /* means poll time is not yet over */
618                 qperf_inc(q, tasklet_inbound_resched);
619                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
620                         tasklet_schedule(&q->tasklet);
621                         return;
622                 }
623         }
624
625         qdio_stop_polling(q);
626         /*
627          * We need to check again to not lose initiative after
628          * resetting the ACK state.
629          */
630         if (!qdio_inbound_q_done(q)) {
631                 qperf_inc(q, tasklet_inbound_resched2);
632                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
633                         tasklet_schedule(&q->tasklet);
634         }
635 }
636
637 void qdio_inbound_processing(unsigned long data)
638 {
639         struct qdio_q *q = (struct qdio_q *)data;
640         __qdio_inbound_processing(q);
641 }
642
643 static int get_outbound_buffer_frontier(struct qdio_q *q)
644 {
645         int count, stop;
646         unsigned char state;
647
648         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
649             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
650                 qdio_siga_sync_q(q);
651
652         /*
653          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
654          * would return 0.
655          */
656         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
657         stop = add_buf(q->first_to_check, count);
658
659         if (q->first_to_check == stop)
660                 return q->first_to_check;
661
662         count = get_buf_states(q, q->first_to_check, &state, count, 0);
663         if (!count)
664                 return q->first_to_check;
665
666         switch (state) {
667         case SLSB_P_OUTPUT_EMPTY:
668                 /* the adapter got it */
669                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
670
671                 atomic_sub(count, &q->nr_buf_used);
672                 q->first_to_check = add_buf(q->first_to_check, count);
673                 if (q->irq_ptr->perf_stat_enabled)
674                         account_sbals(q, count);
675                 break;
676         case SLSB_P_OUTPUT_ERROR:
677                 announce_buffer_error(q, count);
678                 /* process the buffer, the upper layer will take care of it */
679                 q->first_to_check = add_buf(q->first_to_check, count);
680                 atomic_sub(count, &q->nr_buf_used);
681                 if (q->irq_ptr->perf_stat_enabled)
682                         account_sbals_error(q, count);
683                 break;
684         case SLSB_CU_OUTPUT_PRIMED:
685                 /* the adapter has not fetched the output yet */
686                 if (q->irq_ptr->perf_stat_enabled)
687                         q->q_stats.nr_sbal_nop++;
688                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
689                 break;
690         case SLSB_P_OUTPUT_NOT_INIT:
691         case SLSB_P_OUTPUT_HALTED:
692                 break;
693         default:
694                 BUG();
695         }
696         return q->first_to_check;
697 }
698
699 /* all buffers processed? */
700 static inline int qdio_outbound_q_done(struct qdio_q *q)
701 {
702         return atomic_read(&q->nr_buf_used) == 0;
703 }
704
705 static inline int qdio_outbound_q_moved(struct qdio_q *q)
706 {
707         int bufnr;
708
709         bufnr = get_outbound_buffer_frontier(q);
710
711         if ((bufnr != q->last_move) || q->qdio_error) {
712                 q->last_move = bufnr;
713                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
714                 return 1;
715         } else
716                 return 0;
717 }
718
719 static int qdio_kick_outbound_q(struct qdio_q *q)
720 {
721         unsigned int busy_bit;
722         int cc;
723
724         if (!need_siga_out(q))
725                 return 0;
726
727         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
728         qperf_inc(q, siga_write);
729
730         cc = qdio_siga_output(q, &busy_bit);
731         switch (cc) {
732         case 0:
733                 break;
734         case 2:
735                 if (busy_bit) {
736                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
737                         cc |= QDIO_ERROR_SIGA_BUSY;
738                 } else
739                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
740                 break;
741         case 1:
742         case 3:
743                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
744                 break;
745         }
746         return cc;
747 }
748
749 static void __qdio_outbound_processing(struct qdio_q *q)
750 {
751         qperf_inc(q, tasklet_outbound);
752         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
753
754         if (qdio_outbound_q_moved(q))
755                 qdio_kick_handler(q);
756
757         if (queue_type(q) == QDIO_ZFCP_QFMT)
758                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
759                         goto sched;
760
761         /* bail out for HiperSockets unicast queues */
762         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
763                 return;
764
765         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
766             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
767                 goto sched;
768
769         if (q->u.out.pci_out_enabled)
770                 return;
771
772         /*
773          * Now we know that queue type is either qeth without pci enabled
774          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
775          * EMPTY is noticed and outbound_handler is called after some time.
776          */
777         if (qdio_outbound_q_done(q))
778                 del_timer(&q->u.out.timer);
779         else
780                 if (!timer_pending(&q->u.out.timer))
781                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
782         return;
783
784 sched:
785         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
786                 return;
787         tasklet_schedule(&q->tasklet);
788 }
789
790 /* outbound tasklet */
791 void qdio_outbound_processing(unsigned long data)
792 {
793         struct qdio_q *q = (struct qdio_q *)data;
794         __qdio_outbound_processing(q);
795 }
796
797 void qdio_outbound_timer(unsigned long data)
798 {
799         struct qdio_q *q = (struct qdio_q *)data;
800
801         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
802                 return;
803         tasklet_schedule(&q->tasklet);
804 }
805
806 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
807 {
808         struct qdio_q *out;
809         int i;
810
811         if (!pci_out_supported(q))
812                 return;
813
814         for_each_output_queue(q->irq_ptr, out, i)
815                 if (!qdio_outbound_q_done(out))
816                         tasklet_schedule(&out->tasklet);
817 }
818
819 static void __tiqdio_inbound_processing(struct qdio_q *q)
820 {
821         qperf_inc(q, tasklet_inbound);
822         qdio_sync_after_thinint(q);
823
824         /*
825          * The interrupt could be caused by a PCI request. Check the
826          * PCI capable outbound queues.
827          */
828         qdio_check_outbound_after_thinint(q);
829
830         if (!qdio_inbound_q_moved(q))
831                 return;
832
833         qdio_kick_handler(q);
834
835         if (!qdio_inbound_q_done(q)) {
836                 qperf_inc(q, tasklet_inbound_resched);
837                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
838                         tasklet_schedule(&q->tasklet);
839                         return;
840                 }
841         }
842
843         qdio_stop_polling(q);
844         /*
845          * We need to check again to not lose initiative after
846          * resetting the ACK state.
847          */
848         if (!qdio_inbound_q_done(q)) {
849                 qperf_inc(q, tasklet_inbound_resched2);
850                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
851                         tasklet_schedule(&q->tasklet);
852         }
853 }
854
855 void tiqdio_inbound_processing(unsigned long data)
856 {
857         struct qdio_q *q = (struct qdio_q *)data;
858         __tiqdio_inbound_processing(q);
859 }
860
861 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
862                                   enum qdio_irq_states state)
863 {
864         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
865
866         irq_ptr->state = state;
867         mb();
868 }
869
870 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
871 {
872         if (irb->esw.esw0.erw.cons) {
873                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
874                 DBF_ERROR_HEX(irb, 64);
875                 DBF_ERROR_HEX(irb->ecw, 64);
876         }
877 }
878
879 /* PCI interrupt handler */
880 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
881 {
882         int i;
883         struct qdio_q *q;
884
885         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
886                 return;
887
888         for_each_input_queue(irq_ptr, q, i) {
889                 if (q->u.in.queue_start_poll) {
890                         /* skip if polling is enabled or already in work */
891                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
892                                      &q->u.in.queue_irq_state)) {
893                                 qperf_inc(q, int_discarded);
894                                 continue;
895                         }
896                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
897                                                  q->irq_ptr->int_parm);
898                 } else
899                         tasklet_schedule(&q->tasklet);
900         }
901
902         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
903                 return;
904
905         for_each_output_queue(irq_ptr, q, i) {
906                 if (qdio_outbound_q_done(q))
907                         continue;
908
909                 if (!siga_syncs_out_pci(q))
910                         qdio_siga_sync_q(q);
911
912                 tasklet_schedule(&q->tasklet);
913         }
914 }
915
916 static void qdio_handle_activate_check(struct ccw_device *cdev,
917                                 unsigned long intparm, int cstat, int dstat)
918 {
919         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
920         struct qdio_q *q;
921
922         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
923         DBF_ERROR("intp :%lx", intparm);
924         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
925
926         if (irq_ptr->nr_input_qs) {
927                 q = irq_ptr->input_qs[0];
928         } else if (irq_ptr->nr_output_qs) {
929                 q = irq_ptr->output_qs[0];
930         } else {
931                 dump_stack();
932                 goto no_handler;
933         }
934         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
935                    0, -1, -1, irq_ptr->int_parm);
936 no_handler:
937         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
938 }
939
940 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
941                                       int dstat)
942 {
943         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
944
945         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
946
947         if (cstat)
948                 goto error;
949         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
950                 goto error;
951         if (!(dstat & DEV_STAT_DEV_END))
952                 goto error;
953         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
954         return;
955
956 error:
957         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
958         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
959         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
960 }
961
962 /* qdio interrupt handler */
963 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
964                       struct irb *irb)
965 {
966         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
967         int cstat, dstat;
968
969         if (!intparm || !irq_ptr) {
970                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
971                 return;
972         }
973
974         kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++;
975         if (irq_ptr->perf_stat_enabled)
976                 irq_ptr->perf_stat.qdio_int++;
977
978         if (IS_ERR(irb)) {
979                 switch (PTR_ERR(irb)) {
980                 case -EIO:
981                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
982                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
983                         wake_up(&cdev->private->wait_q);
984                         return;
985                 default:
986                         WARN_ON(1);
987                         return;
988                 }
989         }
990         qdio_irq_check_sense(irq_ptr, irb);
991         cstat = irb->scsw.cmd.cstat;
992         dstat = irb->scsw.cmd.dstat;
993
994         switch (irq_ptr->state) {
995         case QDIO_IRQ_STATE_INACTIVE:
996                 qdio_establish_handle_irq(cdev, cstat, dstat);
997                 break;
998         case QDIO_IRQ_STATE_CLEANUP:
999                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1000                 break;
1001         case QDIO_IRQ_STATE_ESTABLISHED:
1002         case QDIO_IRQ_STATE_ACTIVE:
1003                 if (cstat & SCHN_STAT_PCI) {
1004                         qdio_int_handler_pci(irq_ptr);
1005                         return;
1006                 }
1007                 if (cstat || dstat)
1008                         qdio_handle_activate_check(cdev, intparm, cstat,
1009                                                    dstat);
1010                 break;
1011         case QDIO_IRQ_STATE_STOPPED:
1012                 break;
1013         default:
1014                 WARN_ON(1);
1015         }
1016         wake_up(&cdev->private->wait_q);
1017 }
1018
1019 /**
1020  * qdio_get_ssqd_desc - get qdio subchannel description
1021  * @cdev: ccw device to get description for
1022  * @data: where to store the ssqd
1023  *
1024  * Returns 0 or an error code. The results of the chsc are stored in the
1025  * specified structure.
1026  */
1027 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1028                        struct qdio_ssqd_desc *data)
1029 {
1030
1031         if (!cdev || !cdev->private)
1032                 return -EINVAL;
1033
1034         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1035         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1036 }
1037 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1038
1039 static void qdio_shutdown_queues(struct ccw_device *cdev)
1040 {
1041         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1042         struct qdio_q *q;
1043         int i;
1044
1045         for_each_input_queue(irq_ptr, q, i)
1046                 tasklet_kill(&q->tasklet);
1047
1048         for_each_output_queue(irq_ptr, q, i) {
1049                 del_timer(&q->u.out.timer);
1050                 tasklet_kill(&q->tasklet);
1051         }
1052 }
1053
1054 /**
1055  * qdio_shutdown - shut down a qdio subchannel
1056  * @cdev: associated ccw device
1057  * @how: use halt or clear to shutdown
1058  */
1059 int qdio_shutdown(struct ccw_device *cdev, int how)
1060 {
1061         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1062         int rc;
1063         unsigned long flags;
1064
1065         if (!irq_ptr)
1066                 return -ENODEV;
1067
1068         BUG_ON(irqs_disabled());
1069         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1070
1071         mutex_lock(&irq_ptr->setup_mutex);
1072         /*
1073          * Subchannel was already shot down. We cannot prevent being called
1074          * twice since cio may trigger a shutdown asynchronously.
1075          */
1076         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1077                 mutex_unlock(&irq_ptr->setup_mutex);
1078                 return 0;
1079         }
1080
1081         /*
1082          * Indicate that the device is going down. Scheduling the queue
1083          * tasklets is forbidden from here on.
1084          */
1085         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1086
1087         tiqdio_remove_input_queues(irq_ptr);
1088         qdio_shutdown_queues(cdev);
1089         qdio_shutdown_debug_entries(irq_ptr, cdev);
1090
1091         /* cleanup subchannel */
1092         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1093
1094         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1095                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1096         else
1097                 /* default behaviour is halt */
1098                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1099         if (rc) {
1100                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1101                 DBF_ERROR("rc:%4d", rc);
1102                 goto no_cleanup;
1103         }
1104
1105         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1106         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1107         wait_event_interruptible_timeout(cdev->private->wait_q,
1108                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1109                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1110                 10 * HZ);
1111         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1112
1113 no_cleanup:
1114         qdio_shutdown_thinint(irq_ptr);
1115
1116         /* restore interrupt handler */
1117         if ((void *)cdev->handler == (void *)qdio_int_handler)
1118                 cdev->handler = irq_ptr->orig_handler;
1119         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1120
1121         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1122         mutex_unlock(&irq_ptr->setup_mutex);
1123         if (rc)
1124                 return rc;
1125         return 0;
1126 }
1127 EXPORT_SYMBOL_GPL(qdio_shutdown);
1128
1129 /**
1130  * qdio_free - free data structures for a qdio subchannel
1131  * @cdev: associated ccw device
1132  */
1133 int qdio_free(struct ccw_device *cdev)
1134 {
1135         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1136
1137         if (!irq_ptr)
1138                 return -ENODEV;
1139
1140         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1141         mutex_lock(&irq_ptr->setup_mutex);
1142
1143         if (irq_ptr->debug_area != NULL) {
1144                 debug_unregister(irq_ptr->debug_area);
1145                 irq_ptr->debug_area = NULL;
1146         }
1147         cdev->private->qdio_data = NULL;
1148         mutex_unlock(&irq_ptr->setup_mutex);
1149
1150         qdio_release_memory(irq_ptr);
1151         return 0;
1152 }
1153 EXPORT_SYMBOL_GPL(qdio_free);
1154
1155 /**
1156  * qdio_allocate - allocate qdio queues and associated data
1157  * @init_data: initialization data
1158  */
1159 int qdio_allocate(struct qdio_initialize *init_data)
1160 {
1161         struct qdio_irq *irq_ptr;
1162
1163         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1164
1165         if ((init_data->no_input_qs && !init_data->input_handler) ||
1166             (init_data->no_output_qs && !init_data->output_handler))
1167                 return -EINVAL;
1168
1169         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1170             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1171                 return -EINVAL;
1172
1173         if ((!init_data->input_sbal_addr_array) ||
1174             (!init_data->output_sbal_addr_array))
1175                 return -EINVAL;
1176
1177         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1178         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1179         if (!irq_ptr)
1180                 goto out_err;
1181
1182         mutex_init(&irq_ptr->setup_mutex);
1183         qdio_allocate_dbf(init_data, irq_ptr);
1184
1185         /*
1186          * Allocate a page for the chsc calls in qdio_establish.
1187          * Must be pre-allocated since a zfcp recovery will call
1188          * qdio_establish. In case of low memory and swap on a zfcp disk
1189          * we may not be able to allocate memory otherwise.
1190          */
1191         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1192         if (!irq_ptr->chsc_page)
1193                 goto out_rel;
1194
1195         /* qdr is used in ccw1.cda which is u32 */
1196         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1197         if (!irq_ptr->qdr)
1198                 goto out_rel;
1199         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1200
1201         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1202                              init_data->no_output_qs))
1203                 goto out_rel;
1204
1205         init_data->cdev->private->qdio_data = irq_ptr;
1206         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1207         return 0;
1208 out_rel:
1209         qdio_release_memory(irq_ptr);
1210 out_err:
1211         return -ENOMEM;
1212 }
1213 EXPORT_SYMBOL_GPL(qdio_allocate);
1214
1215 /**
1216  * qdio_establish - establish queues on a qdio subchannel
1217  * @init_data: initialization data
1218  */
1219 int qdio_establish(struct qdio_initialize *init_data)
1220 {
1221         struct qdio_irq *irq_ptr;
1222         struct ccw_device *cdev = init_data->cdev;
1223         unsigned long saveflags;
1224         int rc;
1225
1226         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1227
1228         irq_ptr = cdev->private->qdio_data;
1229         if (!irq_ptr)
1230                 return -ENODEV;
1231
1232         if (cdev->private->state != DEV_STATE_ONLINE)
1233                 return -EINVAL;
1234
1235         mutex_lock(&irq_ptr->setup_mutex);
1236         qdio_setup_irq(init_data);
1237
1238         rc = qdio_establish_thinint(irq_ptr);
1239         if (rc) {
1240                 mutex_unlock(&irq_ptr->setup_mutex);
1241                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1242                 return rc;
1243         }
1244
1245         /* establish q */
1246         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1247         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1248         irq_ptr->ccw.count = irq_ptr->equeue.count;
1249         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1250
1251         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1252         ccw_device_set_options_mask(cdev, 0);
1253
1254         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1255         if (rc) {
1256                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1257                 DBF_ERROR("rc:%4x", rc);
1258         }
1259         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1260
1261         if (rc) {
1262                 mutex_unlock(&irq_ptr->setup_mutex);
1263                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1264                 return rc;
1265         }
1266
1267         wait_event_interruptible_timeout(cdev->private->wait_q,
1268                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1269                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1270
1271         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1272                 mutex_unlock(&irq_ptr->setup_mutex);
1273                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1274                 return -EIO;
1275         }
1276
1277         qdio_setup_ssqd_info(irq_ptr);
1278         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1279         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1280
1281         /* qebsm is now setup if available, initialize buffer states */
1282         qdio_init_buf_states(irq_ptr);
1283
1284         mutex_unlock(&irq_ptr->setup_mutex);
1285         qdio_print_subchannel_info(irq_ptr, cdev);
1286         qdio_setup_debug_entries(irq_ptr, cdev);
1287         return 0;
1288 }
1289 EXPORT_SYMBOL_GPL(qdio_establish);
1290
1291 /**
1292  * qdio_activate - activate queues on a qdio subchannel
1293  * @cdev: associated cdev
1294  */
1295 int qdio_activate(struct ccw_device *cdev)
1296 {
1297         struct qdio_irq *irq_ptr;
1298         int rc;
1299         unsigned long saveflags;
1300
1301         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1302
1303         irq_ptr = cdev->private->qdio_data;
1304         if (!irq_ptr)
1305                 return -ENODEV;
1306
1307         if (cdev->private->state != DEV_STATE_ONLINE)
1308                 return -EINVAL;
1309
1310         mutex_lock(&irq_ptr->setup_mutex);
1311         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1312                 rc = -EBUSY;
1313                 goto out;
1314         }
1315
1316         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1317         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1318         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1319         irq_ptr->ccw.cda = 0;
1320
1321         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1322         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1323
1324         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1325                               0, DOIO_DENY_PREFETCH);
1326         if (rc) {
1327                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1328                 DBF_ERROR("rc:%4x", rc);
1329         }
1330         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1331
1332         if (rc)
1333                 goto out;
1334
1335         if (is_thinint_irq(irq_ptr))
1336                 tiqdio_add_input_queues(irq_ptr);
1337
1338         /* wait for subchannel to become active */
1339         msleep(5);
1340
1341         switch (irq_ptr->state) {
1342         case QDIO_IRQ_STATE_STOPPED:
1343         case QDIO_IRQ_STATE_ERR:
1344                 rc = -EIO;
1345                 break;
1346         default:
1347                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1348                 rc = 0;
1349         }
1350 out:
1351         mutex_unlock(&irq_ptr->setup_mutex);
1352         return rc;
1353 }
1354 EXPORT_SYMBOL_GPL(qdio_activate);
1355
1356 static inline int buf_in_between(int bufnr, int start, int count)
1357 {
1358         int end = add_buf(start, count);
1359
1360         if (end > start) {
1361                 if (bufnr >= start && bufnr < end)
1362                         return 1;
1363                 else
1364                         return 0;
1365         }
1366
1367         /* wrap-around case */
1368         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1369             (bufnr < end))
1370                 return 1;
1371         else
1372                 return 0;
1373 }
1374
1375 /**
1376  * handle_inbound - reset processed input buffers
1377  * @q: queue containing the buffers
1378  * @callflags: flags
1379  * @bufnr: first buffer to process
1380  * @count: how many buffers are emptied
1381  */
1382 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1383                           int bufnr, int count)
1384 {
1385         int used, diff;
1386
1387         qperf_inc(q, inbound_call);
1388
1389         if (!q->u.in.polling)
1390                 goto set;
1391
1392         /* protect against stop polling setting an ACK for an emptied slsb */
1393         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1394                 /* overwriting everything, just delete polling status */
1395                 q->u.in.polling = 0;
1396                 q->u.in.ack_count = 0;
1397                 goto set;
1398         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1399                 if (is_qebsm(q)) {
1400                         /* partial overwrite, just update ack_start */
1401                         diff = add_buf(bufnr, count);
1402                         diff = sub_buf(diff, q->u.in.ack_start);
1403                         q->u.in.ack_count -= diff;
1404                         if (q->u.in.ack_count <= 0) {
1405                                 q->u.in.polling = 0;
1406                                 q->u.in.ack_count = 0;
1407                                 goto set;
1408                         }
1409                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1410                 }
1411                 else
1412                         /* the only ACK will be deleted, so stop polling */
1413                         q->u.in.polling = 0;
1414         }
1415
1416 set:
1417         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1418
1419         used = atomic_add_return(count, &q->nr_buf_used) - count;
1420         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1421
1422         /* no need to signal as long as the adapter had free buffers */
1423         if (used)
1424                 return 0;
1425
1426         if (need_siga_in(q))
1427                 return qdio_siga_input(q);
1428         return 0;
1429 }
1430
1431 /**
1432  * handle_outbound - process filled outbound buffers
1433  * @q: queue containing the buffers
1434  * @callflags: flags
1435  * @bufnr: first buffer to process
1436  * @count: how many buffers are filled
1437  */
1438 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1439                            int bufnr, int count)
1440 {
1441         unsigned char state;
1442         int used, rc = 0;
1443
1444         qperf_inc(q, outbound_call);
1445
1446         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1447         used = atomic_add_return(count, &q->nr_buf_used);
1448         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1449
1450         if (callflags & QDIO_FLAG_PCI_OUT) {
1451                 q->u.out.pci_out_enabled = 1;
1452                 qperf_inc(q, pci_request_int);
1453         }
1454         else
1455                 q->u.out.pci_out_enabled = 0;
1456
1457         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1458                 if (multicast_outbound(q))
1459                         rc = qdio_kick_outbound_q(q);
1460                 else
1461                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1462                             (count > 1) &&
1463                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1464                                 /* exploit enhanced SIGA */
1465                                 q->u.out.use_enh_siga = 1;
1466                                 rc = qdio_kick_outbound_q(q);
1467                         } else {
1468                                 /*
1469                                 * One siga-w per buffer required for unicast
1470                                 * HiperSockets.
1471                                 */
1472                                 q->u.out.use_enh_siga = 0;
1473                                 while (count--) {
1474                                         rc = qdio_kick_outbound_q(q);
1475                                         if (rc)
1476                                                 goto out;
1477                                 }
1478                         }
1479                 goto out;
1480         }
1481
1482         if (need_siga_sync(q)) {
1483                 qdio_siga_sync_q(q);
1484                 goto out;
1485         }
1486
1487         /* try to fast requeue buffers */
1488         get_buf_state(q, prev_buf(bufnr), &state, 0);
1489         if (state != SLSB_CU_OUTPUT_PRIMED)
1490                 rc = qdio_kick_outbound_q(q);
1491         else
1492                 qperf_inc(q, fast_requeue);
1493
1494 out:
1495         /* in case of SIGA errors we must process the error immediately */
1496         if (used >= q->u.out.scan_threshold || rc)
1497                 tasklet_schedule(&q->tasklet);
1498         else
1499                 /* free the SBALs in case of no further traffic */
1500                 if (!timer_pending(&q->u.out.timer))
1501                         mod_timer(&q->u.out.timer, jiffies + HZ);
1502         return rc;
1503 }
1504
1505 /**
1506  * do_QDIO - process input or output buffers
1507  * @cdev: associated ccw_device for the qdio subchannel
1508  * @callflags: input or output and special flags from the program
1509  * @q_nr: queue number
1510  * @bufnr: buffer number
1511  * @count: how many buffers to process
1512  */
1513 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1514             int q_nr, unsigned int bufnr, unsigned int count)
1515 {
1516         struct qdio_irq *irq_ptr;
1517
1518         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1519                 return -EINVAL;
1520
1521         irq_ptr = cdev->private->qdio_data;
1522         if (!irq_ptr)
1523                 return -ENODEV;
1524
1525         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1526                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1527
1528         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1529                 return -EBUSY;
1530
1531         if (callflags & QDIO_FLAG_SYNC_INPUT)
1532                 return handle_inbound(irq_ptr->input_qs[q_nr],
1533                                       callflags, bufnr, count);
1534         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1535                 return handle_outbound(irq_ptr->output_qs[q_nr],
1536                                        callflags, bufnr, count);
1537         return -EINVAL;
1538 }
1539 EXPORT_SYMBOL_GPL(do_QDIO);
1540
1541 /**
1542  * qdio_start_irq - process input buffers
1543  * @cdev: associated ccw_device for the qdio subchannel
1544  * @nr: input queue number
1545  *
1546  * Return codes
1547  *   0 - success
1548  *   1 - irqs not started since new data is available
1549  */
1550 int qdio_start_irq(struct ccw_device *cdev, int nr)
1551 {
1552         struct qdio_q *q;
1553         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1554
1555         if (!irq_ptr)
1556                 return -ENODEV;
1557         q = irq_ptr->input_qs[nr];
1558
1559         WARN_ON(queue_irqs_enabled(q));
1560
1561         if (!shared_ind(q->irq_ptr->dsci))
1562                 xchg(q->irq_ptr->dsci, 0);
1563
1564         qdio_stop_polling(q);
1565         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1566
1567         /*
1568          * We need to check again to not lose initiative after
1569          * resetting the ACK state.
1570          */
1571         if (!shared_ind(q->irq_ptr->dsci) && *q->irq_ptr->dsci)
1572                 goto rescan;
1573         if (!qdio_inbound_q_done(q))
1574                 goto rescan;
1575         return 0;
1576
1577 rescan:
1578         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1579                              &q->u.in.queue_irq_state))
1580                 return 0;
1581         else
1582                 return 1;
1583
1584 }
1585 EXPORT_SYMBOL(qdio_start_irq);
1586
1587 /**
1588  * qdio_get_next_buffers - process input buffers
1589  * @cdev: associated ccw_device for the qdio subchannel
1590  * @nr: input queue number
1591  * @bufnr: first filled buffer number
1592  * @error: buffers are in error state
1593  *
1594  * Return codes
1595  *   < 0 - error
1596  *   = 0 - no new buffers found
1597  *   > 0 - number of processed buffers
1598  */
1599 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1600                           int *error)
1601 {
1602         struct qdio_q *q;
1603         int start, end;
1604         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1605
1606         if (!irq_ptr)
1607                 return -ENODEV;
1608         q = irq_ptr->input_qs[nr];
1609         WARN_ON(queue_irqs_enabled(q));
1610
1611         qdio_sync_after_thinint(q);
1612
1613         /*
1614          * The interrupt could be caused by a PCI request. Check the
1615          * PCI capable outbound queues.
1616          */
1617         qdio_check_outbound_after_thinint(q);
1618
1619         if (!qdio_inbound_q_moved(q))
1620                 return 0;
1621
1622         /* Note: upper-layer MUST stop processing immediately here ... */
1623         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1624                 return -EIO;
1625
1626         start = q->first_to_kick;
1627         end = q->first_to_check;
1628         *bufnr = start;
1629         *error = q->qdio_error;
1630
1631         /* for the next time */
1632         q->first_to_kick = end;
1633         q->qdio_error = 0;
1634         return sub_buf(end, start);
1635 }
1636 EXPORT_SYMBOL(qdio_get_next_buffers);
1637
1638 /**
1639  * qdio_stop_irq - disable interrupt processing for the device
1640  * @cdev: associated ccw_device for the qdio subchannel
1641  * @nr: input queue number
1642  *
1643  * Return codes
1644  *   0 - interrupts were already disabled
1645  *   1 - interrupts successfully disabled
1646  */
1647 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1648 {
1649         struct qdio_q *q;
1650         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1651
1652         if (!irq_ptr)
1653                 return -ENODEV;
1654         q = irq_ptr->input_qs[nr];
1655
1656         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1657                              &q->u.in.queue_irq_state))
1658                 return 0;
1659         else
1660                 return 1;
1661 }
1662 EXPORT_SYMBOL(qdio_stop_irq);
1663
1664 static int __init init_QDIO(void)
1665 {
1666         int rc;
1667
1668         rc = qdio_setup_init();
1669         if (rc)
1670                 return rc;
1671         rc = tiqdio_allocate_memory();
1672         if (rc)
1673                 goto out_cache;
1674         rc = qdio_debug_init();
1675         if (rc)
1676                 goto out_ti;
1677         rc = tiqdio_register_thinints();
1678         if (rc)
1679                 goto out_debug;
1680         return 0;
1681
1682 out_debug:
1683         qdio_debug_exit();
1684 out_ti:
1685         tiqdio_free_memory();
1686 out_cache:
1687         qdio_setup_exit();
1688         return rc;
1689 }
1690
1691 static void __exit exit_QDIO(void)
1692 {
1693         tiqdio_unregister_thinints();
1694         tiqdio_free_memory();
1695         qdio_debug_exit();
1696         qdio_setup_exit();
1697 }
1698
1699 module_init(init_QDIO);
1700 module_exit(exit_QDIO);