[S390] qdio: convert global statistics to per-device stats
[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 <asm/atomic.h>
17 #include <asm/debug.h>
18 #include <asm/qdio.h>
19
20 #include "cio.h"
21 #include "css.h"
22 #include "device.h"
23 #include "qdio.h"
24 #include "qdio_debug.h"
25
26 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
27         "Jan Glauber <jang@linux.vnet.ibm.com>");
28 MODULE_DESCRIPTION("QDIO base support");
29 MODULE_LICENSE("GPL");
30
31 static inline int do_siga_sync(struct subchannel_id schid,
32                                unsigned int out_mask, unsigned int in_mask)
33 {
34         register unsigned long __fc asm ("0") = 2;
35         register struct subchannel_id __schid asm ("1") = schid;
36         register unsigned long out asm ("2") = out_mask;
37         register unsigned long in asm ("3") = in_mask;
38         int cc;
39
40         asm volatile(
41                 "       siga    0\n"
42                 "       ipm     %0\n"
43                 "       srl     %0,28\n"
44                 : "=d" (cc)
45                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
46         return cc;
47 }
48
49 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
50 {
51         register unsigned long __fc asm ("0") = 1;
52         register struct subchannel_id __schid asm ("1") = schid;
53         register unsigned long __mask asm ("2") = mask;
54         int cc;
55
56         asm volatile(
57                 "       siga    0\n"
58                 "       ipm     %0\n"
59                 "       srl     %0,28\n"
60                 : "=d" (cc)
61                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
62         return cc;
63 }
64
65 /**
66  * do_siga_output - perform SIGA-w/wt function
67  * @schid: subchannel id or in case of QEBSM the subchannel token
68  * @mask: which output queues to process
69  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
70  * @fc: function code to perform
71  *
72  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
73  * Note: For IQDC unicast queues only the highest priority queue is processed.
74  */
75 static inline int do_siga_output(unsigned long schid, unsigned long mask,
76                                  unsigned int *bb, unsigned int fc)
77 {
78         register unsigned long __fc asm("0") = fc;
79         register unsigned long __schid asm("1") = schid;
80         register unsigned long __mask asm("2") = mask;
81         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
82
83         asm volatile(
84                 "       siga    0\n"
85                 "0:     ipm     %0\n"
86                 "       srl     %0,28\n"
87                 "1:\n"
88                 EX_TABLE(0b, 1b)
89                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
90                 : : "cc", "memory");
91         *bb = ((unsigned int) __fc) >> 31;
92         return cc;
93 }
94
95 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
96 {
97         /* all done or next buffer state different */
98         if (ccq == 0 || ccq == 32)
99                 return 0;
100         /* not all buffers processed */
101         if (ccq == 96 || ccq == 97)
102                 return 1;
103         /* notify devices immediately */
104         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
105         return -EIO;
106 }
107
108 /**
109  * qdio_do_eqbs - extract buffer states for QEBSM
110  * @q: queue to manipulate
111  * @state: state of the extracted buffers
112  * @start: buffer number to start at
113  * @count: count of buffers to examine
114  * @auto_ack: automatically acknowledge buffers
115  *
116  * Returns the number of successfully extracted equal buffer states.
117  * Stops processing if a state is different from the last buffers state.
118  */
119 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
120                         int start, int count, int auto_ack)
121 {
122         unsigned int ccq = 0;
123         int tmp_count = count, tmp_start = start;
124         int nr = q->nr;
125         int rc;
126
127         BUG_ON(!q->irq_ptr->sch_token);
128         qperf_inc(q, eqbs);
129
130         if (!q->is_input_q)
131                 nr += q->irq_ptr->nr_input_qs;
132 again:
133         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
134                       auto_ack);
135         rc = qdio_check_ccq(q, ccq);
136
137         /* At least one buffer was processed, return and extract the remaining
138          * buffers later.
139          */
140         if ((ccq == 96) && (count != tmp_count)) {
141                 qperf_inc(q, eqbs_partial);
142                 return (count - tmp_count);
143         }
144
145         if (rc == 1) {
146                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
147                 goto again;
148         }
149
150         if (rc < 0) {
151                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
152                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
153                 q->handler(q->irq_ptr->cdev,
154                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
155                            0, -1, -1, q->irq_ptr->int_parm);
156                 return 0;
157         }
158         return count - tmp_count;
159 }
160
161 /**
162  * qdio_do_sqbs - set buffer states for QEBSM
163  * @q: queue to manipulate
164  * @state: new state of the buffers
165  * @start: first buffer number to change
166  * @count: how many buffers to change
167  *
168  * Returns the number of successfully changed buffers.
169  * Does retrying until the specified count of buffer states is set or an
170  * error occurs.
171  */
172 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
173                         int count)
174 {
175         unsigned int ccq = 0;
176         int tmp_count = count, tmp_start = start;
177         int nr = q->nr;
178         int rc;
179
180         if (!count)
181                 return 0;
182
183         BUG_ON(!q->irq_ptr->sch_token);
184         qperf_inc(q, sqbs);
185
186         if (!q->is_input_q)
187                 nr += q->irq_ptr->nr_input_qs;
188 again:
189         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
190         rc = qdio_check_ccq(q, ccq);
191         if (rc == 1) {
192                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
193                 qperf_inc(q, sqbs_partial);
194                 goto again;
195         }
196         if (rc < 0) {
197                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
198                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
199                 q->handler(q->irq_ptr->cdev,
200                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
201                            0, -1, -1, q->irq_ptr->int_parm);
202                 return 0;
203         }
204         WARN_ON(tmp_count);
205         return count - tmp_count;
206 }
207
208 /* returns number of examined buffers and their common state in *state */
209 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
210                                  unsigned char *state, unsigned int count,
211                                  int auto_ack)
212 {
213         unsigned char __state = 0;
214         int i;
215
216         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
217         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
218
219         if (is_qebsm(q))
220                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
221
222         for (i = 0; i < count; i++) {
223                 if (!__state)
224                         __state = q->slsb.val[bufnr];
225                 else if (q->slsb.val[bufnr] != __state)
226                         break;
227                 bufnr = next_buf(bufnr);
228         }
229         *state = __state;
230         return i;
231 }
232
233 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
234                                 unsigned char *state, int auto_ack)
235 {
236         return get_buf_states(q, bufnr, state, 1, auto_ack);
237 }
238
239 /* wrap-around safe setting of slsb states, returns number of changed buffers */
240 static inline int set_buf_states(struct qdio_q *q, int bufnr,
241                                  unsigned char state, int count)
242 {
243         int i;
244
245         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
246         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
247
248         if (is_qebsm(q))
249                 return qdio_do_sqbs(q, state, bufnr, count);
250
251         for (i = 0; i < count; i++) {
252                 xchg(&q->slsb.val[bufnr], state);
253                 bufnr = next_buf(bufnr);
254         }
255         return count;
256 }
257
258 static inline int set_buf_state(struct qdio_q *q, int bufnr,
259                                 unsigned char state)
260 {
261         return set_buf_states(q, bufnr, state, 1);
262 }
263
264 /* set slsb states to initial state */
265 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
266 {
267         struct qdio_q *q;
268         int i;
269
270         for_each_input_queue(irq_ptr, q, i)
271                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
272                                QDIO_MAX_BUFFERS_PER_Q);
273         for_each_output_queue(irq_ptr, q, i)
274                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
275                                QDIO_MAX_BUFFERS_PER_Q);
276 }
277
278 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
279                           unsigned int input)
280 {
281         int cc;
282
283         if (!need_siga_sync(q))
284                 return 0;
285
286         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
287         qperf_inc(q, siga_sync);
288
289         cc = do_siga_sync(q->irq_ptr->schid, output, input);
290         if (cc)
291                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
292         return cc;
293 }
294
295 static inline int qdio_siga_sync_q(struct qdio_q *q)
296 {
297         if (q->is_input_q)
298                 return qdio_siga_sync(q, 0, q->mask);
299         else
300                 return qdio_siga_sync(q, q->mask, 0);
301 }
302
303 static inline int qdio_siga_sync_out(struct qdio_q *q)
304 {
305         return qdio_siga_sync(q, ~0U, 0);
306 }
307
308 static inline int qdio_siga_sync_all(struct qdio_q *q)
309 {
310         return qdio_siga_sync(q, ~0U, ~0U);
311 }
312
313 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
314 {
315         unsigned long schid;
316         unsigned int fc = 0;
317         u64 start_time = 0;
318         int cc;
319
320         if (q->u.out.use_enh_siga)
321                 fc = 3;
322
323         if (is_qebsm(q)) {
324                 schid = q->irq_ptr->sch_token;
325                 fc |= 0x80;
326         }
327         else
328                 schid = *((u32 *)&q->irq_ptr->schid);
329
330 again:
331         cc = do_siga_output(schid, q->mask, busy_bit, fc);
332
333         /* hipersocket busy condition */
334         if (*busy_bit) {
335                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
336
337                 if (!start_time) {
338                         start_time = get_usecs();
339                         goto again;
340                 }
341                 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
342                         goto again;
343         }
344         return cc;
345 }
346
347 static inline int qdio_siga_input(struct qdio_q *q)
348 {
349         int cc;
350
351         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
352         qperf_inc(q, siga_read);
353
354         cc = do_siga_input(q->irq_ptr->schid, q->mask);
355         if (cc)
356                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
357         return cc;
358 }
359
360 static inline void qdio_sync_after_thinint(struct qdio_q *q)
361 {
362         if (pci_out_supported(q)) {
363                 if (need_siga_sync_thinint(q))
364                         qdio_siga_sync_all(q);
365                 else if (need_siga_sync_out_thinint(q))
366                         qdio_siga_sync_out(q);
367         } else
368                 qdio_siga_sync_q(q);
369 }
370
371 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
372                         unsigned char *state)
373 {
374         qdio_siga_sync_q(q);
375         return get_buf_states(q, bufnr, state, 1, 0);
376 }
377
378 static inline void qdio_stop_polling(struct qdio_q *q)
379 {
380         if (!q->u.in.polling)
381                 return;
382
383         q->u.in.polling = 0;
384         qperf_inc(q, stop_polling);
385
386         /* show the card that we are not polling anymore */
387         if (is_qebsm(q)) {
388                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
389                                q->u.in.ack_count);
390                 q->u.in.ack_count = 0;
391         } else
392                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
393 }
394
395 static void announce_buffer_error(struct qdio_q *q, int count)
396 {
397         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
398
399         /* special handling for no target buffer empty */
400         if ((!q->is_input_q &&
401             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
402                 qperf_inc(q, target_full);
403                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
404                               q->first_to_check);
405                 return;
406         }
407
408         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
409         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
410         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
411         DBF_ERROR("F14:%2x F15:%2x",
412                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
413                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
414 }
415
416 static inline void inbound_primed(struct qdio_q *q, int count)
417 {
418         int new;
419
420         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
421
422         /* for QEBSM the ACK was already set by EQBS */
423         if (is_qebsm(q)) {
424                 if (!q->u.in.polling) {
425                         q->u.in.polling = 1;
426                         q->u.in.ack_count = count;
427                         q->u.in.ack_start = q->first_to_check;
428                         return;
429                 }
430
431                 /* delete the previous ACK's */
432                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
433                                q->u.in.ack_count);
434                 q->u.in.ack_count = count;
435                 q->u.in.ack_start = q->first_to_check;
436                 return;
437         }
438
439         /*
440          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
441          * or by the next inbound run.
442          */
443         new = add_buf(q->first_to_check, count - 1);
444         if (q->u.in.polling) {
445                 /* reset the previous ACK but first set the new one */
446                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
447                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
448         } else {
449                 q->u.in.polling = 1;
450                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
451         }
452
453         q->u.in.ack_start = new;
454         count--;
455         if (!count)
456                 return;
457         /* need to change ALL buffers to get more interrupts */
458         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
459 }
460
461 static int get_inbound_buffer_frontier(struct qdio_q *q)
462 {
463         int count, stop;
464         unsigned char state;
465
466         /*
467          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
468          * would return 0.
469          */
470         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
471         stop = add_buf(q->first_to_check, count);
472
473         if (q->first_to_check == stop)
474                 goto out;
475
476         /*
477          * No siga sync here, as a PCI or we after a thin interrupt
478          * already sync'ed the queues.
479          */
480         count = get_buf_states(q, q->first_to_check, &state, count, 1);
481         if (!count)
482                 goto out;
483
484         switch (state) {
485         case SLSB_P_INPUT_PRIMED:
486                 inbound_primed(q, count);
487                 q->first_to_check = add_buf(q->first_to_check, count);
488                 if (atomic_sub(count, &q->nr_buf_used) == 0)
489                         qperf_inc(q, inbound_queue_full);
490                 break;
491         case SLSB_P_INPUT_ERROR:
492                 announce_buffer_error(q, count);
493                 /* process the buffer, the upper layer will take care of it */
494                 q->first_to_check = add_buf(q->first_to_check, count);
495                 atomic_sub(count, &q->nr_buf_used);
496                 break;
497         case SLSB_CU_INPUT_EMPTY:
498         case SLSB_P_INPUT_NOT_INIT:
499         case SLSB_P_INPUT_ACK:
500                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
501                 break;
502         default:
503                 BUG();
504         }
505 out:
506         return q->first_to_check;
507 }
508
509 static int qdio_inbound_q_moved(struct qdio_q *q)
510 {
511         int bufnr;
512
513         bufnr = get_inbound_buffer_frontier(q);
514
515         if ((bufnr != q->last_move) || q->qdio_error) {
516                 q->last_move = bufnr;
517                 if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
518                         q->u.in.timestamp = get_usecs();
519                 return 1;
520         } else
521                 return 0;
522 }
523
524 static inline int qdio_inbound_q_done(struct qdio_q *q)
525 {
526         unsigned char state = 0;
527
528         if (!atomic_read(&q->nr_buf_used))
529                 return 1;
530
531         qdio_siga_sync_q(q);
532         get_buf_state(q, q->first_to_check, &state, 0);
533
534         if (state == SLSB_P_INPUT_PRIMED)
535                 /* more work coming */
536                 return 0;
537
538         if (is_thinint_irq(q->irq_ptr))
539                 return 1;
540
541         /* don't poll under z/VM */
542         if (MACHINE_IS_VM)
543                 return 1;
544
545         /*
546          * At this point we know, that inbound first_to_check
547          * has (probably) not moved (see qdio_inbound_processing).
548          */
549         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
550                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
551                               q->first_to_check);
552                 return 1;
553         } else
554                 return 0;
555 }
556
557 static void qdio_kick_handler(struct qdio_q *q)
558 {
559         int start = q->first_to_kick;
560         int end = q->first_to_check;
561         int count;
562
563         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
564                 return;
565
566         count = sub_buf(end, start);
567
568         if (q->is_input_q) {
569                 qperf_inc(q, inbound_handler);
570                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
571         } else
572                 qperf_inc(q, outbound_handler);
573                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
574                               start, count);
575
576         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
577                    q->irq_ptr->int_parm);
578
579         /* for the next time */
580         q->first_to_kick = end;
581         q->qdio_error = 0;
582 }
583
584 static void __qdio_inbound_processing(struct qdio_q *q)
585 {
586         qperf_inc(q, tasklet_inbound);
587 again:
588         if (!qdio_inbound_q_moved(q))
589                 return;
590
591         qdio_kick_handler(q);
592
593         if (!qdio_inbound_q_done(q)) {
594                 /* means poll time is not yet over */
595                 qperf_inc(q, tasklet_inbound_resched);
596                 goto again;
597         }
598
599         qdio_stop_polling(q);
600         /*
601          * We need to check again to not lose initiative after
602          * resetting the ACK state.
603          */
604         if (!qdio_inbound_q_done(q)) {
605                 qperf_inc(q, tasklet_inbound_resched2);
606                 goto again;
607         }
608 }
609
610 void qdio_inbound_processing(unsigned long data)
611 {
612         struct qdio_q *q = (struct qdio_q *)data;
613         __qdio_inbound_processing(q);
614 }
615
616 static int get_outbound_buffer_frontier(struct qdio_q *q)
617 {
618         int count, stop;
619         unsigned char state;
620
621         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
622             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
623                 qdio_siga_sync_q(q);
624
625         /*
626          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
627          * would return 0.
628          */
629         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
630         stop = add_buf(q->first_to_check, count);
631
632         if (q->first_to_check == stop)
633                 return q->first_to_check;
634
635         count = get_buf_states(q, q->first_to_check, &state, count, 0);
636         if (!count)
637                 return q->first_to_check;
638
639         switch (state) {
640         case SLSB_P_OUTPUT_EMPTY:
641                 /* the adapter got it */
642                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
643
644                 atomic_sub(count, &q->nr_buf_used);
645                 q->first_to_check = add_buf(q->first_to_check, count);
646                 break;
647         case SLSB_P_OUTPUT_ERROR:
648                 announce_buffer_error(q, count);
649                 /* process the buffer, the upper layer will take care of it */
650                 q->first_to_check = add_buf(q->first_to_check, count);
651                 atomic_sub(count, &q->nr_buf_used);
652                 break;
653         case SLSB_CU_OUTPUT_PRIMED:
654                 /* the adapter has not fetched the output yet */
655                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
656                 break;
657         case SLSB_P_OUTPUT_NOT_INIT:
658         case SLSB_P_OUTPUT_HALTED:
659                 break;
660         default:
661                 BUG();
662         }
663         return q->first_to_check;
664 }
665
666 /* all buffers processed? */
667 static inline int qdio_outbound_q_done(struct qdio_q *q)
668 {
669         return atomic_read(&q->nr_buf_used) == 0;
670 }
671
672 static inline int qdio_outbound_q_moved(struct qdio_q *q)
673 {
674         int bufnr;
675
676         bufnr = get_outbound_buffer_frontier(q);
677
678         if ((bufnr != q->last_move) || q->qdio_error) {
679                 q->last_move = bufnr;
680                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
681                 return 1;
682         } else
683                 return 0;
684 }
685
686 static int qdio_kick_outbound_q(struct qdio_q *q)
687 {
688         unsigned int busy_bit;
689         int cc;
690
691         if (!need_siga_out(q))
692                 return 0;
693
694         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
695         qperf_inc(q, siga_write);
696
697         cc = qdio_siga_output(q, &busy_bit);
698         switch (cc) {
699         case 0:
700                 break;
701         case 2:
702                 if (busy_bit) {
703                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
704                         cc |= QDIO_ERROR_SIGA_BUSY;
705                 } else
706                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
707                 break;
708         case 1:
709         case 3:
710                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
711                 break;
712         }
713         return cc;
714 }
715
716 static void __qdio_outbound_processing(struct qdio_q *q)
717 {
718         qperf_inc(q, tasklet_outbound);
719         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
720
721         if (qdio_outbound_q_moved(q))
722                 qdio_kick_handler(q);
723
724         if (queue_type(q) == QDIO_ZFCP_QFMT)
725                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
726                         goto sched;
727
728         /* bail out for HiperSockets unicast queues */
729         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
730                 return;
731
732         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
733             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
734                 goto sched;
735
736         if (q->u.out.pci_out_enabled)
737                 return;
738
739         /*
740          * Now we know that queue type is either qeth without pci enabled
741          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
742          * EMPTY is noticed and outbound_handler is called after some time.
743          */
744         if (qdio_outbound_q_done(q))
745                 del_timer(&q->u.out.timer);
746         else
747                 if (!timer_pending(&q->u.out.timer))
748                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
749         return;
750
751 sched:
752         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
753                 return;
754         tasklet_schedule(&q->tasklet);
755 }
756
757 /* outbound tasklet */
758 void qdio_outbound_processing(unsigned long data)
759 {
760         struct qdio_q *q = (struct qdio_q *)data;
761         __qdio_outbound_processing(q);
762 }
763
764 void qdio_outbound_timer(unsigned long data)
765 {
766         struct qdio_q *q = (struct qdio_q *)data;
767
768         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
769                 return;
770         tasklet_schedule(&q->tasklet);
771 }
772
773 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
774 {
775         struct qdio_q *out;
776         int i;
777
778         if (!pci_out_supported(q))
779                 return;
780
781         for_each_output_queue(q->irq_ptr, out, i)
782                 if (!qdio_outbound_q_done(out))
783                         tasklet_schedule(&out->tasklet);
784 }
785
786 static void __tiqdio_inbound_processing(struct qdio_q *q)
787 {
788         qperf_inc(q, tasklet_inbound);
789         qdio_sync_after_thinint(q);
790
791         /*
792          * The interrupt could be caused by a PCI request. Check the
793          * PCI capable outbound queues.
794          */
795         qdio_check_outbound_after_thinint(q);
796
797         if (!qdio_inbound_q_moved(q))
798                 return;
799
800         qdio_kick_handler(q);
801
802         if (!qdio_inbound_q_done(q)) {
803                 qperf_inc(q, tasklet_inbound_resched);
804                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
805                         tasklet_schedule(&q->tasklet);
806                         return;
807                 }
808         }
809
810         qdio_stop_polling(q);
811         /*
812          * We need to check again to not lose initiative after
813          * resetting the ACK state.
814          */
815         if (!qdio_inbound_q_done(q)) {
816                 qperf_inc(q, tasklet_inbound_resched2);
817                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
818                         tasklet_schedule(&q->tasklet);
819         }
820 }
821
822 void tiqdio_inbound_processing(unsigned long data)
823 {
824         struct qdio_q *q = (struct qdio_q *)data;
825         __tiqdio_inbound_processing(q);
826 }
827
828 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
829                                   enum qdio_irq_states state)
830 {
831         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
832
833         irq_ptr->state = state;
834         mb();
835 }
836
837 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
838 {
839         if (irb->esw.esw0.erw.cons) {
840                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
841                 DBF_ERROR_HEX(irb, 64);
842                 DBF_ERROR_HEX(irb->ecw, 64);
843         }
844 }
845
846 /* PCI interrupt handler */
847 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
848 {
849         int i;
850         struct qdio_q *q;
851
852         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
853                 return;
854
855         for_each_input_queue(irq_ptr, q, i)
856                 tasklet_schedule(&q->tasklet);
857
858         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
859                 return;
860
861         for_each_output_queue(irq_ptr, q, i) {
862                 if (qdio_outbound_q_done(q))
863                         continue;
864
865                 if (!siga_syncs_out_pci(q))
866                         qdio_siga_sync_q(q);
867
868                 tasklet_schedule(&q->tasklet);
869         }
870 }
871
872 static void qdio_handle_activate_check(struct ccw_device *cdev,
873                                 unsigned long intparm, int cstat, int dstat)
874 {
875         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
876         struct qdio_q *q;
877
878         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
879         DBF_ERROR("intp :%lx", intparm);
880         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
881
882         if (irq_ptr->nr_input_qs) {
883                 q = irq_ptr->input_qs[0];
884         } else if (irq_ptr->nr_output_qs) {
885                 q = irq_ptr->output_qs[0];
886         } else {
887                 dump_stack();
888                 goto no_handler;
889         }
890         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
891                    0, -1, -1, irq_ptr->int_parm);
892 no_handler:
893         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
894 }
895
896 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
897                                       int dstat)
898 {
899         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
900
901         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
902
903         if (cstat)
904                 goto error;
905         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
906                 goto error;
907         if (!(dstat & DEV_STAT_DEV_END))
908                 goto error;
909         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
910         return;
911
912 error:
913         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
914         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
915         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
916 }
917
918 /* qdio interrupt handler */
919 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
920                       struct irb *irb)
921 {
922         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
923         int cstat, dstat;
924
925         if (!intparm || !irq_ptr) {
926                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
927                 return;
928         }
929
930         if (IS_ERR(irb)) {
931                 switch (PTR_ERR(irb)) {
932                 case -EIO:
933                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
934                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
935                         wake_up(&cdev->private->wait_q);
936                         return;
937                 default:
938                         WARN_ON(1);
939                         return;
940                 }
941         }
942         qdio_irq_check_sense(irq_ptr, irb);
943         cstat = irb->scsw.cmd.cstat;
944         dstat = irb->scsw.cmd.dstat;
945
946         switch (irq_ptr->state) {
947         case QDIO_IRQ_STATE_INACTIVE:
948                 qdio_establish_handle_irq(cdev, cstat, dstat);
949                 break;
950         case QDIO_IRQ_STATE_CLEANUP:
951                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
952                 break;
953         case QDIO_IRQ_STATE_ESTABLISHED:
954         case QDIO_IRQ_STATE_ACTIVE:
955                 if (cstat & SCHN_STAT_PCI) {
956                         qdio_int_handler_pci(irq_ptr);
957                         return;
958                 }
959                 if (cstat || dstat)
960                         qdio_handle_activate_check(cdev, intparm, cstat,
961                                                    dstat);
962                 break;
963         default:
964                 WARN_ON(1);
965         }
966         wake_up(&cdev->private->wait_q);
967 }
968
969 /**
970  * qdio_get_ssqd_desc - get qdio subchannel description
971  * @cdev: ccw device to get description for
972  * @data: where to store the ssqd
973  *
974  * Returns 0 or an error code. The results of the chsc are stored in the
975  * specified structure.
976  */
977 int qdio_get_ssqd_desc(struct ccw_device *cdev,
978                        struct qdio_ssqd_desc *data)
979 {
980
981         if (!cdev || !cdev->private)
982                 return -EINVAL;
983
984         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
985         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
986 }
987 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
988
989 /**
990  * qdio_cleanup - shutdown queues and free data structures
991  * @cdev: associated ccw device
992  * @how: use halt or clear to shutdown
993  *
994  * This function calls qdio_shutdown() for @cdev with method @how.
995  * and qdio_free(). The qdio_free() return value is ignored since
996  * !irq_ptr is already checked.
997  */
998 int qdio_cleanup(struct ccw_device *cdev, int how)
999 {
1000         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1001         int rc;
1002
1003         if (!irq_ptr)
1004                 return -ENODEV;
1005
1006         rc = qdio_shutdown(cdev, how);
1007
1008         qdio_free(cdev);
1009         return rc;
1010 }
1011 EXPORT_SYMBOL_GPL(qdio_cleanup);
1012
1013 static void qdio_shutdown_queues(struct ccw_device *cdev)
1014 {
1015         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1016         struct qdio_q *q;
1017         int i;
1018
1019         for_each_input_queue(irq_ptr, q, i)
1020                 tasklet_kill(&q->tasklet);
1021
1022         for_each_output_queue(irq_ptr, q, i) {
1023                 del_timer(&q->u.out.timer);
1024                 tasklet_kill(&q->tasklet);
1025         }
1026 }
1027
1028 /**
1029  * qdio_shutdown - shut down a qdio subchannel
1030  * @cdev: associated ccw device
1031  * @how: use halt or clear to shutdown
1032  */
1033 int qdio_shutdown(struct ccw_device *cdev, int how)
1034 {
1035         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1036         int rc;
1037         unsigned long flags;
1038
1039         if (!irq_ptr)
1040                 return -ENODEV;
1041
1042         BUG_ON(irqs_disabled());
1043         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1044
1045         mutex_lock(&irq_ptr->setup_mutex);
1046         /*
1047          * Subchannel was already shot down. We cannot prevent being called
1048          * twice since cio may trigger a shutdown asynchronously.
1049          */
1050         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1051                 mutex_unlock(&irq_ptr->setup_mutex);
1052                 return 0;
1053         }
1054
1055         /*
1056          * Indicate that the device is going down. Scheduling the queue
1057          * tasklets is forbidden from here on.
1058          */
1059         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1060
1061         tiqdio_remove_input_queues(irq_ptr);
1062         qdio_shutdown_queues(cdev);
1063         qdio_shutdown_debug_entries(irq_ptr, cdev);
1064
1065         /* cleanup subchannel */
1066         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1067
1068         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1069                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1070         else
1071                 /* default behaviour is halt */
1072                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1073         if (rc) {
1074                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1075                 DBF_ERROR("rc:%4d", rc);
1076                 goto no_cleanup;
1077         }
1078
1079         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1080         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1081         wait_event_interruptible_timeout(cdev->private->wait_q,
1082                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1083                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1084                 10 * HZ);
1085         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1086
1087 no_cleanup:
1088         qdio_shutdown_thinint(irq_ptr);
1089
1090         /* restore interrupt handler */
1091         if ((void *)cdev->handler == (void *)qdio_int_handler)
1092                 cdev->handler = irq_ptr->orig_handler;
1093         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1094
1095         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1096         mutex_unlock(&irq_ptr->setup_mutex);
1097         if (rc)
1098                 return rc;
1099         return 0;
1100 }
1101 EXPORT_SYMBOL_GPL(qdio_shutdown);
1102
1103 /**
1104  * qdio_free - free data structures for a qdio subchannel
1105  * @cdev: associated ccw device
1106  */
1107 int qdio_free(struct ccw_device *cdev)
1108 {
1109         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1110
1111         if (!irq_ptr)
1112                 return -ENODEV;
1113
1114         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1115         mutex_lock(&irq_ptr->setup_mutex);
1116
1117         if (irq_ptr->debug_area != NULL) {
1118                 debug_unregister(irq_ptr->debug_area);
1119                 irq_ptr->debug_area = NULL;
1120         }
1121         cdev->private->qdio_data = NULL;
1122         mutex_unlock(&irq_ptr->setup_mutex);
1123
1124         qdio_release_memory(irq_ptr);
1125         return 0;
1126 }
1127 EXPORT_SYMBOL_GPL(qdio_free);
1128
1129 /**
1130  * qdio_initialize - allocate and establish queues for a qdio subchannel
1131  * @init_data: initialization data
1132  *
1133  * This function first allocates queues via qdio_allocate() and on success
1134  * establishes them via qdio_establish().
1135  */
1136 int qdio_initialize(struct qdio_initialize *init_data)
1137 {
1138         int rc;
1139
1140         rc = qdio_allocate(init_data);
1141         if (rc)
1142                 return rc;
1143
1144         rc = qdio_establish(init_data);
1145         if (rc)
1146                 qdio_free(init_data->cdev);
1147         return rc;
1148 }
1149 EXPORT_SYMBOL_GPL(qdio_initialize);
1150
1151 /**
1152  * qdio_allocate - allocate qdio queues and associated data
1153  * @init_data: initialization data
1154  */
1155 int qdio_allocate(struct qdio_initialize *init_data)
1156 {
1157         struct qdio_irq *irq_ptr;
1158
1159         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1160
1161         if ((init_data->no_input_qs && !init_data->input_handler) ||
1162             (init_data->no_output_qs && !init_data->output_handler))
1163                 return -EINVAL;
1164
1165         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1166             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1167                 return -EINVAL;
1168
1169         if ((!init_data->input_sbal_addr_array) ||
1170             (!init_data->output_sbal_addr_array))
1171                 return -EINVAL;
1172
1173         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1174         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1175         if (!irq_ptr)
1176                 goto out_err;
1177
1178         mutex_init(&irq_ptr->setup_mutex);
1179         qdio_allocate_dbf(init_data, irq_ptr);
1180
1181         /*
1182          * Allocate a page for the chsc calls in qdio_establish.
1183          * Must be pre-allocated since a zfcp recovery will call
1184          * qdio_establish. In case of low memory and swap on a zfcp disk
1185          * we may not be able to allocate memory otherwise.
1186          */
1187         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1188         if (!irq_ptr->chsc_page)
1189                 goto out_rel;
1190
1191         /* qdr is used in ccw1.cda which is u32 */
1192         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1193         if (!irq_ptr->qdr)
1194                 goto out_rel;
1195         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1196
1197         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1198                              init_data->no_output_qs))
1199                 goto out_rel;
1200
1201         init_data->cdev->private->qdio_data = irq_ptr;
1202         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1203         return 0;
1204 out_rel:
1205         qdio_release_memory(irq_ptr);
1206 out_err:
1207         return -ENOMEM;
1208 }
1209 EXPORT_SYMBOL_GPL(qdio_allocate);
1210
1211 /**
1212  * qdio_establish - establish queues on a qdio subchannel
1213  * @init_data: initialization data
1214  */
1215 int qdio_establish(struct qdio_initialize *init_data)
1216 {
1217         struct qdio_irq *irq_ptr;
1218         struct ccw_device *cdev = init_data->cdev;
1219         unsigned long saveflags;
1220         int rc;
1221
1222         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1223
1224         irq_ptr = cdev->private->qdio_data;
1225         if (!irq_ptr)
1226                 return -ENODEV;
1227
1228         if (cdev->private->state != DEV_STATE_ONLINE)
1229                 return -EINVAL;
1230
1231         mutex_lock(&irq_ptr->setup_mutex);
1232         qdio_setup_irq(init_data);
1233
1234         rc = qdio_establish_thinint(irq_ptr);
1235         if (rc) {
1236                 mutex_unlock(&irq_ptr->setup_mutex);
1237                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1238                 return rc;
1239         }
1240
1241         /* establish q */
1242         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1243         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1244         irq_ptr->ccw.count = irq_ptr->equeue.count;
1245         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1246
1247         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1248         ccw_device_set_options_mask(cdev, 0);
1249
1250         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1251         if (rc) {
1252                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1253                 DBF_ERROR("rc:%4x", rc);
1254         }
1255         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1256
1257         if (rc) {
1258                 mutex_unlock(&irq_ptr->setup_mutex);
1259                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1260                 return rc;
1261         }
1262
1263         wait_event_interruptible_timeout(cdev->private->wait_q,
1264                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1265                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1266
1267         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1268                 mutex_unlock(&irq_ptr->setup_mutex);
1269                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1270                 return -EIO;
1271         }
1272
1273         qdio_setup_ssqd_info(irq_ptr);
1274         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1275         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1276
1277         /* qebsm is now setup if available, initialize buffer states */
1278         qdio_init_buf_states(irq_ptr);
1279
1280         mutex_unlock(&irq_ptr->setup_mutex);
1281         qdio_print_subchannel_info(irq_ptr, cdev);
1282         qdio_setup_debug_entries(irq_ptr, cdev);
1283         return 0;
1284 }
1285 EXPORT_SYMBOL_GPL(qdio_establish);
1286
1287 /**
1288  * qdio_activate - activate queues on a qdio subchannel
1289  * @cdev: associated cdev
1290  */
1291 int qdio_activate(struct ccw_device *cdev)
1292 {
1293         struct qdio_irq *irq_ptr;
1294         int rc;
1295         unsigned long saveflags;
1296
1297         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1298
1299         irq_ptr = cdev->private->qdio_data;
1300         if (!irq_ptr)
1301                 return -ENODEV;
1302
1303         if (cdev->private->state != DEV_STATE_ONLINE)
1304                 return -EINVAL;
1305
1306         mutex_lock(&irq_ptr->setup_mutex);
1307         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1308                 rc = -EBUSY;
1309                 goto out;
1310         }
1311
1312         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1313         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1314         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1315         irq_ptr->ccw.cda = 0;
1316
1317         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1318         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1319
1320         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1321                               0, DOIO_DENY_PREFETCH);
1322         if (rc) {
1323                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1324                 DBF_ERROR("rc:%4x", rc);
1325         }
1326         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1327
1328         if (rc)
1329                 goto out;
1330
1331         if (is_thinint_irq(irq_ptr))
1332                 tiqdio_add_input_queues(irq_ptr);
1333
1334         /* wait for subchannel to become active */
1335         msleep(5);
1336
1337         switch (irq_ptr->state) {
1338         case QDIO_IRQ_STATE_STOPPED:
1339         case QDIO_IRQ_STATE_ERR:
1340                 rc = -EIO;
1341                 break;
1342         default:
1343                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1344                 rc = 0;
1345         }
1346 out:
1347         mutex_unlock(&irq_ptr->setup_mutex);
1348         return rc;
1349 }
1350 EXPORT_SYMBOL_GPL(qdio_activate);
1351
1352 static inline int buf_in_between(int bufnr, int start, int count)
1353 {
1354         int end = add_buf(start, count);
1355
1356         if (end > start) {
1357                 if (bufnr >= start && bufnr < end)
1358                         return 1;
1359                 else
1360                         return 0;
1361         }
1362
1363         /* wrap-around case */
1364         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1365             (bufnr < end))
1366                 return 1;
1367         else
1368                 return 0;
1369 }
1370
1371 /**
1372  * handle_inbound - reset processed input buffers
1373  * @q: queue containing the buffers
1374  * @callflags: flags
1375  * @bufnr: first buffer to process
1376  * @count: how many buffers are emptied
1377  */
1378 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1379                           int bufnr, int count)
1380 {
1381         int used, diff;
1382
1383         qperf_inc(q, inbound_call);
1384
1385         if (!q->u.in.polling)
1386                 goto set;
1387
1388         /* protect against stop polling setting an ACK for an emptied slsb */
1389         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1390                 /* overwriting everything, just delete polling status */
1391                 q->u.in.polling = 0;
1392                 q->u.in.ack_count = 0;
1393                 goto set;
1394         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1395                 if (is_qebsm(q)) {
1396                         /* partial overwrite, just update ack_start */
1397                         diff = add_buf(bufnr, count);
1398                         diff = sub_buf(diff, q->u.in.ack_start);
1399                         q->u.in.ack_count -= diff;
1400                         if (q->u.in.ack_count <= 0) {
1401                                 q->u.in.polling = 0;
1402                                 q->u.in.ack_count = 0;
1403                                 goto set;
1404                         }
1405                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1406                 }
1407                 else
1408                         /* the only ACK will be deleted, so stop polling */
1409                         q->u.in.polling = 0;
1410         }
1411
1412 set:
1413         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1414
1415         used = atomic_add_return(count, &q->nr_buf_used) - count;
1416         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1417
1418         /* no need to signal as long as the adapter had free buffers */
1419         if (used)
1420                 return 0;
1421
1422         if (need_siga_in(q))
1423                 return qdio_siga_input(q);
1424         return 0;
1425 }
1426
1427 /**
1428  * handle_outbound - process filled outbound buffers
1429  * @q: queue containing the buffers
1430  * @callflags: flags
1431  * @bufnr: first buffer to process
1432  * @count: how many buffers are filled
1433  */
1434 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1435                            int bufnr, int count)
1436 {
1437         unsigned char state;
1438         int used, rc = 0;
1439
1440         qperf_inc(q, outbound_call);
1441
1442         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1443         used = atomic_add_return(count, &q->nr_buf_used);
1444         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1445
1446         if (callflags & QDIO_FLAG_PCI_OUT) {
1447                 q->u.out.pci_out_enabled = 1;
1448                 qperf_inc(q, pci_request_int);
1449         }
1450         else
1451                 q->u.out.pci_out_enabled = 0;
1452
1453         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1454                 if (multicast_outbound(q))
1455                         rc = qdio_kick_outbound_q(q);
1456                 else
1457                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1458                             (count > 1) &&
1459                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1460                                 /* exploit enhanced SIGA */
1461                                 q->u.out.use_enh_siga = 1;
1462                                 rc = qdio_kick_outbound_q(q);
1463                         } else {
1464                                 /*
1465                                 * One siga-w per buffer required for unicast
1466                                 * HiperSockets.
1467                                 */
1468                                 q->u.out.use_enh_siga = 0;
1469                                 while (count--) {
1470                                         rc = qdio_kick_outbound_q(q);
1471                                         if (rc)
1472                                                 goto out;
1473                                 }
1474                         }
1475                 goto out;
1476         }
1477
1478         if (need_siga_sync(q)) {
1479                 qdio_siga_sync_q(q);
1480                 goto out;
1481         }
1482
1483         /* try to fast requeue buffers */
1484         get_buf_state(q, prev_buf(bufnr), &state, 0);
1485         if (state != SLSB_CU_OUTPUT_PRIMED)
1486                 rc = qdio_kick_outbound_q(q);
1487         else
1488                 qperf_inc(q, fast_requeue);
1489
1490 out:
1491         tasklet_schedule(&q->tasklet);
1492         return rc;
1493 }
1494
1495 /**
1496  * do_QDIO - process input or output buffers
1497  * @cdev: associated ccw_device for the qdio subchannel
1498  * @callflags: input or output and special flags from the program
1499  * @q_nr: queue number
1500  * @bufnr: buffer number
1501  * @count: how many buffers to process
1502  */
1503 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1504             int q_nr, unsigned int bufnr, unsigned int count)
1505 {
1506         struct qdio_irq *irq_ptr;
1507
1508         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1509                 return -EINVAL;
1510
1511         irq_ptr = cdev->private->qdio_data;
1512         if (!irq_ptr)
1513                 return -ENODEV;
1514
1515         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1516                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1517
1518         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1519                 return -EBUSY;
1520
1521         if (callflags & QDIO_FLAG_SYNC_INPUT)
1522                 return handle_inbound(irq_ptr->input_qs[q_nr],
1523                                       callflags, bufnr, count);
1524         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1525                 return handle_outbound(irq_ptr->output_qs[q_nr],
1526                                        callflags, bufnr, count);
1527         return -EINVAL;
1528 }
1529 EXPORT_SYMBOL_GPL(do_QDIO);
1530
1531 static int __init init_QDIO(void)
1532 {
1533         int rc;
1534
1535         rc = qdio_setup_init();
1536         if (rc)
1537                 return rc;
1538         rc = tiqdio_allocate_memory();
1539         if (rc)
1540                 goto out_cache;
1541         rc = qdio_debug_init();
1542         if (rc)
1543                 goto out_ti;
1544         rc = tiqdio_register_thinints();
1545         if (rc)
1546                 goto out_debug;
1547         return 0;
1548
1549 out_debug:
1550         qdio_debug_exit();
1551 out_ti:
1552         tiqdio_free_memory();
1553 out_cache:
1554         qdio_setup_exit();
1555         return rc;
1556 }
1557
1558 static void __exit exit_QDIO(void)
1559 {
1560         tiqdio_unregister_thinints();
1561         tiqdio_free_memory();
1562         qdio_debug_exit();
1563         qdio_setup_exit();
1564 }
1565
1566 module_init(init_QDIO);
1567 module_exit(exit_QDIO);