[S390] sparse: fix sparse static warnings
[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/io.h>
18 #include <linux/atomic.h>
19 #include <asm/debug.h>
20 #include <asm/qdio.h>
21
22 #include "cio.h"
23 #include "css.h"
24 #include "device.h"
25 #include "qdio.h"
26 #include "qdio_debug.h"
27
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(unsigned long schid,
34                                unsigned int out_mask, unsigned int in_mask,
35                                unsigned int fc)
36 {
37         register unsigned long __fc asm ("0") = fc;
38         register unsigned long __schid asm ("1") = schid;
39         register unsigned long out asm ("2") = out_mask;
40         register unsigned long in asm ("3") = in_mask;
41         int cc;
42
43         asm volatile(
44                 "       siga    0\n"
45                 "       ipm     %0\n"
46                 "       srl     %0,28\n"
47                 : "=d" (cc)
48                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
49         return cc;
50 }
51
52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
53                                 unsigned int fc)
54 {
55         register unsigned long __fc asm ("0") = fc;
56         register unsigned long __schid asm ("1") = schid;
57         register unsigned long __mask asm ("2") = mask;
58         int cc;
59
60         asm volatile(
61                 "       siga    0\n"
62                 "       ipm     %0\n"
63                 "       srl     %0,28\n"
64                 : "=d" (cc)
65                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
66         return cc;
67 }
68
69 /**
70  * do_siga_output - perform SIGA-w/wt function
71  * @schid: subchannel id or in case of QEBSM the subchannel token
72  * @mask: which output queues to process
73  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
74  * @fc: function code to perform
75  *
76  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
77  * Note: For IQDC unicast queues only the highest priority queue is processed.
78  */
79 static inline int do_siga_output(unsigned long schid, unsigned long mask,
80                                  unsigned int *bb, unsigned int fc,
81                                  unsigned long aob)
82 {
83         register unsigned long __fc asm("0") = fc;
84         register unsigned long __schid asm("1") = schid;
85         register unsigned long __mask asm("2") = mask;
86         register unsigned long __aob asm("3") = aob;
87         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
88
89         asm volatile(
90                 "       siga    0\n"
91                 "0:     ipm     %0\n"
92                 "       srl     %0,28\n"
93                 "1:\n"
94                 EX_TABLE(0b, 1b)
95                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask),
96                   "+d" (__aob)
97                 : : "cc", "memory");
98         *bb = ((unsigned int) __fc) >> 31;
99         return cc;
100 }
101
102 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
103 {
104         /* all done or next buffer state different */
105         if (ccq == 0 || ccq == 32)
106                 return 0;
107         /* no buffer processed */
108         if (ccq == 97)
109                 return 1;
110         /* not all buffers processed */
111         if (ccq == 96)
112                 return 2;
113         /* notify devices immediately */
114         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
115         return -EIO;
116 }
117
118 /**
119  * qdio_do_eqbs - extract buffer states for QEBSM
120  * @q: queue to manipulate
121  * @state: state of the extracted buffers
122  * @start: buffer number to start at
123  * @count: count of buffers to examine
124  * @auto_ack: automatically acknowledge buffers
125  *
126  * Returns the number of successfully extracted equal buffer states.
127  * Stops processing if a state is different from the last buffers state.
128  */
129 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
130                         int start, int count, int auto_ack)
131 {
132         int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
133         unsigned int ccq = 0;
134
135         BUG_ON(!q->irq_ptr->sch_token);
136         qperf_inc(q, eqbs);
137
138         if (!q->is_input_q)
139                 nr += q->irq_ptr->nr_input_qs;
140 again:
141         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
142                       auto_ack);
143         rc = qdio_check_ccq(q, ccq);
144         if (!rc)
145                 return count - tmp_count;
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 == 2) {
153                 BUG_ON(tmp_count == count);
154                 qperf_inc(q, eqbs_partial);
155                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
156                         tmp_count);
157                 /*
158                  * Retry once, if that fails bail out and process the
159                  * extracted buffers before trying again.
160                  */
161                 if (!retried++)
162                         goto again;
163                 else
164                         return count - tmp_count;
165         }
166
167         DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
168         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
169         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
170                    0, -1, -1, q->irq_ptr->int_parm);
171         return 0;
172 }
173
174 /**
175  * qdio_do_sqbs - set buffer states for QEBSM
176  * @q: queue to manipulate
177  * @state: new state of the buffers
178  * @start: first buffer number to change
179  * @count: how many buffers to change
180  *
181  * Returns the number of successfully changed buffers.
182  * Does retrying until the specified count of buffer states is set or an
183  * error occurs.
184  */
185 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
186                         int count)
187 {
188         unsigned int ccq = 0;
189         int tmp_count = count, tmp_start = start;
190         int nr = q->nr;
191         int rc;
192
193         if (!count)
194                 return 0;
195
196         BUG_ON(!q->irq_ptr->sch_token);
197         qperf_inc(q, sqbs);
198
199         if (!q->is_input_q)
200                 nr += q->irq_ptr->nr_input_qs;
201 again:
202         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
203         rc = qdio_check_ccq(q, ccq);
204         if (!rc) {
205                 WARN_ON(tmp_count);
206                 return count - tmp_count;
207         }
208
209         if (rc == 1 || rc == 2) {
210                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
211                 qperf_inc(q, sqbs_partial);
212                 goto again;
213         }
214
215         DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
216         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
217         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
218                    0, -1, -1, q->irq_ptr->int_parm);
219         return 0;
220 }
221
222 /* returns number of examined buffers and their common state in *state */
223 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
224                                  unsigned char *state, unsigned int count,
225                                  int auto_ack, int merge_pending)
226 {
227         unsigned char __state = 0;
228         int i;
229
230         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
231         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
232
233         if (is_qebsm(q))
234                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
235
236         for (i = 0; i < count; i++) {
237                 if (!__state) {
238                         __state = q->slsb.val[bufnr];
239                         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
240                                 __state = SLSB_P_OUTPUT_EMPTY;
241                 } else if (merge_pending) {
242                         if ((q->slsb.val[bufnr] & __state) != __state)
243                                 break;
244                 } else if (q->slsb.val[bufnr] != __state)
245                         break;
246                 bufnr = next_buf(bufnr);
247         }
248         *state = __state;
249         return i;
250 }
251
252 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
253                                 unsigned char *state, int auto_ack)
254 {
255         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
256 }
257
258 /* wrap-around safe setting of slsb states, returns number of changed buffers */
259 static inline int set_buf_states(struct qdio_q *q, int bufnr,
260                                  unsigned char state, int count)
261 {
262         int i;
263
264         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
265         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
266
267         if (is_qebsm(q))
268                 return qdio_do_sqbs(q, state, bufnr, count);
269
270         for (i = 0; i < count; i++) {
271                 xchg(&q->slsb.val[bufnr], state);
272                 bufnr = next_buf(bufnr);
273         }
274         return count;
275 }
276
277 static inline int set_buf_state(struct qdio_q *q, int bufnr,
278                                 unsigned char state)
279 {
280         return set_buf_states(q, bufnr, state, 1);
281 }
282
283 /* set slsb states to initial state */
284 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
285 {
286         struct qdio_q *q;
287         int i;
288
289         for_each_input_queue(irq_ptr, q, i)
290                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
291                                QDIO_MAX_BUFFERS_PER_Q);
292         for_each_output_queue(irq_ptr, q, i)
293                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
294                                QDIO_MAX_BUFFERS_PER_Q);
295 }
296
297 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
298                           unsigned int input)
299 {
300         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
301         unsigned int fc = QDIO_SIGA_SYNC;
302         int cc;
303
304         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
305         qperf_inc(q, siga_sync);
306
307         if (is_qebsm(q)) {
308                 schid = q->irq_ptr->sch_token;
309                 fc |= QDIO_SIGA_QEBSM_FLAG;
310         }
311
312         cc = do_siga_sync(schid, output, input, fc);
313         if (unlikely(cc))
314                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
315         return cc;
316 }
317
318 static inline int qdio_siga_sync_q(struct qdio_q *q)
319 {
320         if (q->is_input_q)
321                 return qdio_siga_sync(q, 0, q->mask);
322         else
323                 return qdio_siga_sync(q, q->mask, 0);
324 }
325
326 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
327         unsigned long aob)
328 {
329         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
330         unsigned int fc = QDIO_SIGA_WRITE;
331         u64 start_time = 0;
332         int retries = 0, cc;
333         unsigned long laob = 0;
334
335         if (q->u.out.use_cq && aob != 0) {
336                 fc = QDIO_SIGA_WRITEQ;
337                 laob = aob;
338         }
339
340         if (is_qebsm(q)) {
341                 schid = q->irq_ptr->sch_token;
342                 fc |= QDIO_SIGA_QEBSM_FLAG;
343         }
344 again:
345         WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
346                 (aob && fc != QDIO_SIGA_WRITEQ));
347         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
348
349         /* hipersocket busy condition */
350         if (unlikely(*busy_bit)) {
351                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
352                 retries++;
353
354                 if (!start_time) {
355                         start_time = get_clock();
356                         goto again;
357                 }
358                 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
359                         goto again;
360         }
361         if (retries) {
362                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
363                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
364                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
365         }
366         return cc;
367 }
368
369 static inline int qdio_siga_input(struct qdio_q *q)
370 {
371         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
372         unsigned int fc = QDIO_SIGA_READ;
373         int cc;
374
375         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
376         qperf_inc(q, siga_read);
377
378         if (is_qebsm(q)) {
379                 schid = q->irq_ptr->sch_token;
380                 fc |= QDIO_SIGA_QEBSM_FLAG;
381         }
382
383         cc = do_siga_input(schid, q->mask, fc);
384         if (unlikely(cc))
385                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
386         return cc;
387 }
388
389 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
390 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
391
392 static inline void qdio_sync_queues(struct qdio_q *q)
393 {
394         /* PCI capable outbound queues will also be scanned so sync them too */
395         if (pci_out_supported(q))
396                 qdio_siga_sync_all(q);
397         else
398                 qdio_siga_sync_q(q);
399 }
400
401 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
402                         unsigned char *state)
403 {
404         if (need_siga_sync(q))
405                 qdio_siga_sync_q(q);
406         return get_buf_states(q, bufnr, state, 1, 0, 0);
407 }
408
409 static inline void qdio_stop_polling(struct qdio_q *q)
410 {
411         if (!q->u.in.polling)
412                 return;
413
414         q->u.in.polling = 0;
415         qperf_inc(q, stop_polling);
416
417         /* show the card that we are not polling anymore */
418         if (is_qebsm(q)) {
419                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
420                                q->u.in.ack_count);
421                 q->u.in.ack_count = 0;
422         } else
423                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
424 }
425
426 static inline void account_sbals(struct qdio_q *q, int count)
427 {
428         int pos = 0;
429
430         q->q_stats.nr_sbal_total += count;
431         if (count == QDIO_MAX_BUFFERS_MASK) {
432                 q->q_stats.nr_sbals[7]++;
433                 return;
434         }
435         while (count >>= 1)
436                 pos++;
437         q->q_stats.nr_sbals[pos]++;
438 }
439
440 static void process_buffer_error(struct qdio_q *q, int count)
441 {
442         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
443                                         SLSB_P_OUTPUT_NOT_INIT;
444
445         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
446
447         /* special handling for no target buffer empty */
448         if ((!q->is_input_q &&
449             (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
450                 qperf_inc(q, target_full);
451                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
452                               q->first_to_check);
453                 goto set;
454         }
455
456         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
457         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
458         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
459         DBF_ERROR("F14:%2x F15:%2x",
460                   q->sbal[q->first_to_check]->element[14].sflags,
461                   q->sbal[q->first_to_check]->element[15].sflags);
462
463 set:
464         /*
465          * Interrupts may be avoided as long as the error is present
466          * so change the buffer state immediately to avoid starvation.
467          */
468         set_buf_states(q, q->first_to_check, state, count);
469 }
470
471 static inline void inbound_primed(struct qdio_q *q, int count)
472 {
473         int new;
474
475         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
476
477         /* for QEBSM the ACK was already set by EQBS */
478         if (is_qebsm(q)) {
479                 if (!q->u.in.polling) {
480                         q->u.in.polling = 1;
481                         q->u.in.ack_count = count;
482                         q->u.in.ack_start = q->first_to_check;
483                         return;
484                 }
485
486                 /* delete the previous ACK's */
487                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
488                                q->u.in.ack_count);
489                 q->u.in.ack_count = count;
490                 q->u.in.ack_start = q->first_to_check;
491                 return;
492         }
493
494         /*
495          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
496          * or by the next inbound run.
497          */
498         new = add_buf(q->first_to_check, count - 1);
499         if (q->u.in.polling) {
500                 /* reset the previous ACK but first set the new one */
501                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
502                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
503         } else {
504                 q->u.in.polling = 1;
505                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
506         }
507
508         q->u.in.ack_start = new;
509         count--;
510         if (!count)
511                 return;
512         /* need to change ALL buffers to get more interrupts */
513         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
514 }
515
516 static int get_inbound_buffer_frontier(struct qdio_q *q)
517 {
518         int count, stop;
519         unsigned char state = 0;
520
521         q->timestamp = get_clock_fast();
522
523         /*
524          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
525          * would return 0.
526          */
527         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
528         stop = add_buf(q->first_to_check, count);
529
530         if (q->first_to_check == stop)
531                 goto out;
532
533         /*
534          * No siga sync here, as a PCI or we after a thin interrupt
535          * already sync'ed the queues.
536          */
537         count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
538         if (!count)
539                 goto out;
540
541         switch (state) {
542         case SLSB_P_INPUT_PRIMED:
543                 inbound_primed(q, count);
544                 q->first_to_check = add_buf(q->first_to_check, count);
545                 if (atomic_sub(count, &q->nr_buf_used) == 0)
546                         qperf_inc(q, inbound_queue_full);
547                 if (q->irq_ptr->perf_stat_enabled)
548                         account_sbals(q, count);
549                 break;
550         case SLSB_P_INPUT_ERROR:
551                 process_buffer_error(q, count);
552                 q->first_to_check = add_buf(q->first_to_check, count);
553                 atomic_sub(count, &q->nr_buf_used);
554                 if (q->irq_ptr->perf_stat_enabled)
555                         account_sbals_error(q, count);
556                 break;
557         case SLSB_CU_INPUT_EMPTY:
558         case SLSB_P_INPUT_NOT_INIT:
559         case SLSB_P_INPUT_ACK:
560                 if (q->irq_ptr->perf_stat_enabled)
561                         q->q_stats.nr_sbal_nop++;
562                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
563                 break;
564         default:
565                 BUG();
566         }
567 out:
568         return q->first_to_check;
569 }
570
571 static int qdio_inbound_q_moved(struct qdio_q *q)
572 {
573         int bufnr;
574
575         bufnr = get_inbound_buffer_frontier(q);
576
577         if ((bufnr != q->last_move) || q->qdio_error) {
578                 q->last_move = bufnr;
579                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
580                         q->u.in.timestamp = get_clock();
581                 return 1;
582         } else
583                 return 0;
584 }
585
586 static inline int qdio_inbound_q_done(struct qdio_q *q)
587 {
588         unsigned char state = 0;
589
590         if (!atomic_read(&q->nr_buf_used))
591                 return 1;
592
593         if (need_siga_sync(q))
594                 qdio_siga_sync_q(q);
595         get_buf_state(q, q->first_to_check, &state, 0);
596
597         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
598                 /* more work coming */
599                 return 0;
600
601         if (is_thinint_irq(q->irq_ptr))
602                 return 1;
603
604         /* don't poll under z/VM */
605         if (MACHINE_IS_VM)
606                 return 1;
607
608         /*
609          * At this point we know, that inbound first_to_check
610          * has (probably) not moved (see qdio_inbound_processing).
611          */
612         if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
613                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
614                               q->first_to_check);
615                 return 1;
616         } else
617                 return 0;
618 }
619
620 static inline int contains_aobs(struct qdio_q *q)
621 {
622         return !q->is_input_q && q->u.out.use_cq;
623 }
624
625 static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
626                                 int i, struct qaob *aob)
627 {
628         int tmp;
629
630         DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
631                         (unsigned long) virt_to_phys(aob));
632         DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
633                         (unsigned long) aob->res0[0]);
634         DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
635                         (unsigned long) aob->res0[1]);
636         DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
637                         (unsigned long) aob->res0[2]);
638         DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
639                         (unsigned long) aob->res0[3]);
640         DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
641                         (unsigned long) aob->res0[4]);
642         DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
643                         (unsigned long) aob->res0[5]);
644         DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
645         DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
646         DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
647         DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
648         DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
649         DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
650         DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
651         for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
652                 DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
653                                 (unsigned long) aob->sba[tmp]);
654                 DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
655                                 (unsigned long) q->sbal[i]->element[tmp].addr);
656                 DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
657                 DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
658                                 q->sbal[i]->element[tmp].length);
659         }
660         DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
661         for (tmp = 0; tmp < 2; ++tmp) {
662                 DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
663                         (unsigned long) aob->res4[tmp]);
664         }
665         DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
666         DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
667 }
668
669 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
670 {
671         unsigned char state = 0;
672         int j, b = start;
673
674         if (!contains_aobs(q))
675                 return;
676
677         for (j = 0; j < count; ++j) {
678                 get_buf_state(q, b, &state, 0);
679                 if (state == SLSB_P_OUTPUT_PENDING) {
680                         struct qaob *aob = q->u.out.aobs[b];
681                         if (aob == NULL)
682                                 continue;
683
684                         BUG_ON(q->u.out.sbal_state == NULL);
685                         q->u.out.sbal_state[b].flags |=
686                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
687                         q->u.out.aobs[b] = NULL;
688                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
689                         BUG_ON(q->u.out.sbal_state == NULL);
690                         q->u.out.sbal_state[b].aob = NULL;
691                 }
692                 b = next_buf(b);
693         }
694 }
695
696 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
697                                         int bufnr)
698 {
699         unsigned long phys_aob = 0;
700
701         if (!q->use_cq)
702                 goto out;
703
704         if (!q->aobs[bufnr]) {
705                 struct qaob *aob = qdio_allocate_aob();
706                 q->aobs[bufnr] = aob;
707         }
708         if (q->aobs[bufnr]) {
709                 BUG_ON(q->sbal_state == NULL);
710                 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
711                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
712                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
713                 phys_aob = virt_to_phys(q->aobs[bufnr]);
714                 BUG_ON(phys_aob & 0xFF);
715         }
716
717 out:
718         return phys_aob;
719 }
720
721 static void qdio_kick_handler(struct qdio_q *q)
722 {
723         int start = q->first_to_kick;
724         int end = q->first_to_check;
725         int count;
726
727         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
728                 return;
729
730         count = sub_buf(end, start);
731
732         if (q->is_input_q) {
733                 qperf_inc(q, inbound_handler);
734                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
735         } else {
736                 qperf_inc(q, outbound_handler);
737                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
738                               start, count);
739         }
740
741         qdio_handle_aobs(q, start, count);
742
743         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
744                    q->irq_ptr->int_parm);
745
746         /* for the next time */
747         q->first_to_kick = end;
748         q->qdio_error = 0;
749 }
750
751 static void __qdio_inbound_processing(struct qdio_q *q)
752 {
753         qperf_inc(q, tasklet_inbound);
754
755         if (!qdio_inbound_q_moved(q))
756                 return;
757
758         qdio_kick_handler(q);
759
760         if (!qdio_inbound_q_done(q)) {
761                 /* means poll time is not yet over */
762                 qperf_inc(q, tasklet_inbound_resched);
763                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
764                         tasklet_schedule(&q->tasklet);
765                         return;
766                 }
767         }
768
769         qdio_stop_polling(q);
770         /*
771          * We need to check again to not lose initiative after
772          * resetting the ACK state.
773          */
774         if (!qdio_inbound_q_done(q)) {
775                 qperf_inc(q, tasklet_inbound_resched2);
776                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
777                         tasklet_schedule(&q->tasklet);
778         }
779 }
780
781 void qdio_inbound_processing(unsigned long data)
782 {
783         struct qdio_q *q = (struct qdio_q *)data;
784         __qdio_inbound_processing(q);
785 }
786
787 static int get_outbound_buffer_frontier(struct qdio_q *q)
788 {
789         int count, stop;
790         unsigned char state = 0;
791
792         q->timestamp = get_clock_fast();
793
794         if (need_siga_sync(q))
795                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
796                     !pci_out_supported(q)) ||
797                     (queue_type(q) == QDIO_IQDIO_QFMT &&
798                     multicast_outbound(q)))
799                         qdio_siga_sync_q(q);
800
801         /*
802          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
803          * would return 0.
804          */
805         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
806         stop = add_buf(q->first_to_check, count);
807         if (q->first_to_check == stop)
808                 goto out;
809
810         count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
811         if (!count)
812                 goto out;
813
814         switch (state) {
815         case SLSB_P_OUTPUT_PENDING:
816                 BUG();
817         case SLSB_P_OUTPUT_EMPTY:
818                 /* the adapter got it */
819                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
820                         "out empty:%1d %02x", q->nr, count);
821
822                 atomic_sub(count, &q->nr_buf_used);
823                 q->first_to_check = add_buf(q->first_to_check, count);
824                 if (q->irq_ptr->perf_stat_enabled)
825                         account_sbals(q, count);
826
827                 break;
828         case SLSB_P_OUTPUT_ERROR:
829                 process_buffer_error(q, count);
830                 q->first_to_check = add_buf(q->first_to_check, count);
831                 atomic_sub(count, &q->nr_buf_used);
832                 if (q->irq_ptr->perf_stat_enabled)
833                         account_sbals_error(q, count);
834                 break;
835         case SLSB_CU_OUTPUT_PRIMED:
836                 /* the adapter has not fetched the output yet */
837                 if (q->irq_ptr->perf_stat_enabled)
838                         q->q_stats.nr_sbal_nop++;
839                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
840                               q->nr);
841                 break;
842         case SLSB_P_OUTPUT_NOT_INIT:
843         case SLSB_P_OUTPUT_HALTED:
844                 break;
845         default:
846                 BUG();
847         }
848
849 out:
850         return q->first_to_check;
851 }
852
853 /* all buffers processed? */
854 static inline int qdio_outbound_q_done(struct qdio_q *q)
855 {
856         return atomic_read(&q->nr_buf_used) == 0;
857 }
858
859 static inline int qdio_outbound_q_moved(struct qdio_q *q)
860 {
861         int bufnr;
862
863         bufnr = get_outbound_buffer_frontier(q);
864
865         if ((bufnr != q->last_move) || q->qdio_error) {
866                 q->last_move = bufnr;
867                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
868                 return 1;
869         } else
870                 return 0;
871 }
872
873 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
874 {
875         int retries = 0, cc;
876         unsigned int busy_bit;
877
878         if (!need_siga_out(q))
879                 return 0;
880
881         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
882 retry:
883         qperf_inc(q, siga_write);
884
885         cc = qdio_siga_output(q, &busy_bit, aob);
886         switch (cc) {
887         case 0:
888                 break;
889         case 2:
890                 if (busy_bit) {
891                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
892                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
893                                 goto retry;
894                         }
895                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
896                         cc |= QDIO_ERROR_SIGA_BUSY;
897                 } else
898                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
899                 break;
900         case 1:
901         case 3:
902                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
903                 break;
904         }
905         if (retries) {
906                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
907                 DBF_ERROR("count:%u", retries);
908         }
909         return cc;
910 }
911
912 static void __qdio_outbound_processing(struct qdio_q *q)
913 {
914         qperf_inc(q, tasklet_outbound);
915         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
916
917         if (qdio_outbound_q_moved(q))
918                 qdio_kick_handler(q);
919
920         if (queue_type(q) == QDIO_ZFCP_QFMT)
921                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
922                         goto sched;
923
924         if (q->u.out.pci_out_enabled)
925                 return;
926
927         /*
928          * Now we know that queue type is either qeth without pci enabled
929          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
930          * is noticed and outbound_handler is called after some time.
931          */
932         if (qdio_outbound_q_done(q))
933                 del_timer(&q->u.out.timer);
934         else
935                 if (!timer_pending(&q->u.out.timer))
936                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
937         return;
938
939 sched:
940         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
941                 return;
942         tasklet_schedule(&q->tasklet);
943 }
944
945 /* outbound tasklet */
946 void qdio_outbound_processing(unsigned long data)
947 {
948         struct qdio_q *q = (struct qdio_q *)data;
949         __qdio_outbound_processing(q);
950 }
951
952 void qdio_outbound_timer(unsigned long data)
953 {
954         struct qdio_q *q = (struct qdio_q *)data;
955
956         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
957                 return;
958         tasklet_schedule(&q->tasklet);
959 }
960
961 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
962 {
963         struct qdio_q *out;
964         int i;
965
966         if (!pci_out_supported(q))
967                 return;
968
969         for_each_output_queue(q->irq_ptr, out, i)
970                 if (!qdio_outbound_q_done(out))
971                         tasklet_schedule(&out->tasklet);
972 }
973
974 static void __tiqdio_inbound_processing(struct qdio_q *q)
975 {
976         qperf_inc(q, tasklet_inbound);
977         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
978                 qdio_sync_queues(q);
979
980         /*
981          * The interrupt could be caused by a PCI request. Check the
982          * PCI capable outbound queues.
983          */
984         qdio_check_outbound_after_thinint(q);
985
986         if (!qdio_inbound_q_moved(q))
987                 return;
988
989         qdio_kick_handler(q);
990
991         if (!qdio_inbound_q_done(q)) {
992                 qperf_inc(q, tasklet_inbound_resched);
993                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
994                         tasklet_schedule(&q->tasklet);
995                         return;
996                 }
997         }
998
999         qdio_stop_polling(q);
1000         /*
1001          * We need to check again to not lose initiative after
1002          * resetting the ACK state.
1003          */
1004         if (!qdio_inbound_q_done(q)) {
1005                 qperf_inc(q, tasklet_inbound_resched2);
1006                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
1007                         tasklet_schedule(&q->tasklet);
1008         }
1009 }
1010
1011 void tiqdio_inbound_processing(unsigned long data)
1012 {
1013         struct qdio_q *q = (struct qdio_q *)data;
1014         __tiqdio_inbound_processing(q);
1015 }
1016
1017 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
1018                                   enum qdio_irq_states state)
1019 {
1020         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
1021
1022         irq_ptr->state = state;
1023         mb();
1024 }
1025
1026 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
1027 {
1028         if (irb->esw.esw0.erw.cons) {
1029                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
1030                 DBF_ERROR_HEX(irb, 64);
1031                 DBF_ERROR_HEX(irb->ecw, 64);
1032         }
1033 }
1034
1035 /* PCI interrupt handler */
1036 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
1037 {
1038         int i;
1039         struct qdio_q *q;
1040
1041         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
1042                 return;
1043
1044         for_each_input_queue(irq_ptr, q, i) {
1045                 if (q->u.in.queue_start_poll) {
1046                         /* skip if polling is enabled or already in work */
1047                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1048                                      &q->u.in.queue_irq_state)) {
1049                                 qperf_inc(q, int_discarded);
1050                                 continue;
1051                         }
1052                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
1053                                                  q->irq_ptr->int_parm);
1054                 } else {
1055                         tasklet_schedule(&q->tasklet);
1056                 }
1057         }
1058
1059         if (!pci_out_supported(q))
1060                 return;
1061
1062         for_each_output_queue(irq_ptr, q, i) {
1063                 if (qdio_outbound_q_done(q))
1064                         continue;
1065                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1066                         qdio_siga_sync_q(q);
1067                 tasklet_schedule(&q->tasklet);
1068         }
1069 }
1070
1071 static void qdio_handle_activate_check(struct ccw_device *cdev,
1072                                 unsigned long intparm, int cstat, int dstat)
1073 {
1074         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1075         struct qdio_q *q;
1076         int count;
1077
1078         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1079         DBF_ERROR("intp :%lx", intparm);
1080         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1081
1082         if (irq_ptr->nr_input_qs) {
1083                 q = irq_ptr->input_qs[0];
1084         } else if (irq_ptr->nr_output_qs) {
1085                 q = irq_ptr->output_qs[0];
1086         } else {
1087                 dump_stack();
1088                 goto no_handler;
1089         }
1090
1091         count = sub_buf(q->first_to_check, q->first_to_kick);
1092         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
1093                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1094 no_handler:
1095         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1096 }
1097
1098 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1099                                       int dstat)
1100 {
1101         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1102
1103         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1104
1105         if (cstat)
1106                 goto error;
1107         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1108                 goto error;
1109         if (!(dstat & DEV_STAT_DEV_END))
1110                 goto error;
1111         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1112         return;
1113
1114 error:
1115         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1116         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1117         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1118 }
1119
1120 /* qdio interrupt handler */
1121 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1122                       struct irb *irb)
1123 {
1124         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1125         int cstat, dstat;
1126
1127         if (!intparm || !irq_ptr) {
1128                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1129                 return;
1130         }
1131
1132         if (irq_ptr->perf_stat_enabled)
1133                 irq_ptr->perf_stat.qdio_int++;
1134
1135         if (IS_ERR(irb)) {
1136                 switch (PTR_ERR(irb)) {
1137                 case -EIO:
1138                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1139                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1140                         wake_up(&cdev->private->wait_q);
1141                         return;
1142                 default:
1143                         WARN_ON(1);
1144                         return;
1145                 }
1146         }
1147         qdio_irq_check_sense(irq_ptr, irb);
1148         cstat = irb->scsw.cmd.cstat;
1149         dstat = irb->scsw.cmd.dstat;
1150
1151         switch (irq_ptr->state) {
1152         case QDIO_IRQ_STATE_INACTIVE:
1153                 qdio_establish_handle_irq(cdev, cstat, dstat);
1154                 break;
1155         case QDIO_IRQ_STATE_CLEANUP:
1156                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1157                 break;
1158         case QDIO_IRQ_STATE_ESTABLISHED:
1159         case QDIO_IRQ_STATE_ACTIVE:
1160                 if (cstat & SCHN_STAT_PCI) {
1161                         qdio_int_handler_pci(irq_ptr);
1162                         return;
1163                 }
1164                 if (cstat || dstat)
1165                         qdio_handle_activate_check(cdev, intparm, cstat,
1166                                                    dstat);
1167                 break;
1168         case QDIO_IRQ_STATE_STOPPED:
1169                 break;
1170         default:
1171                 WARN_ON(1);
1172         }
1173         wake_up(&cdev->private->wait_q);
1174 }
1175
1176 /**
1177  * qdio_get_ssqd_desc - get qdio subchannel description
1178  * @cdev: ccw device to get description for
1179  * @data: where to store the ssqd
1180  *
1181  * Returns 0 or an error code. The results of the chsc are stored in the
1182  * specified structure.
1183  */
1184 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1185                        struct qdio_ssqd_desc *data)
1186 {
1187
1188         if (!cdev || !cdev->private)
1189                 return -EINVAL;
1190
1191         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1192         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1193 }
1194 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1195
1196 static void qdio_shutdown_queues(struct ccw_device *cdev)
1197 {
1198         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1199         struct qdio_q *q;
1200         int i;
1201
1202         for_each_input_queue(irq_ptr, q, i)
1203                 tasklet_kill(&q->tasklet);
1204
1205         for_each_output_queue(irq_ptr, q, i) {
1206                 del_timer(&q->u.out.timer);
1207                 tasklet_kill(&q->tasklet);
1208         }
1209 }
1210
1211 /**
1212  * qdio_shutdown - shut down a qdio subchannel
1213  * @cdev: associated ccw device
1214  * @how: use halt or clear to shutdown
1215  */
1216 int qdio_shutdown(struct ccw_device *cdev, int how)
1217 {
1218         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1219         int rc;
1220         unsigned long flags;
1221
1222         if (!irq_ptr)
1223                 return -ENODEV;
1224
1225         BUG_ON(irqs_disabled());
1226         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1227
1228         mutex_lock(&irq_ptr->setup_mutex);
1229         /*
1230          * Subchannel was already shot down. We cannot prevent being called
1231          * twice since cio may trigger a shutdown asynchronously.
1232          */
1233         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1234                 mutex_unlock(&irq_ptr->setup_mutex);
1235                 return 0;
1236         }
1237
1238         /*
1239          * Indicate that the device is going down. Scheduling the queue
1240          * tasklets is forbidden from here on.
1241          */
1242         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1243
1244         tiqdio_remove_input_queues(irq_ptr);
1245         qdio_shutdown_queues(cdev);
1246         qdio_shutdown_debug_entries(irq_ptr, cdev);
1247
1248         /* cleanup subchannel */
1249         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1250
1251         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1252                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1253         else
1254                 /* default behaviour is halt */
1255                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1256         if (rc) {
1257                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1258                 DBF_ERROR("rc:%4d", rc);
1259                 goto no_cleanup;
1260         }
1261
1262         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1263         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1264         wait_event_interruptible_timeout(cdev->private->wait_q,
1265                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1266                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1267                 10 * HZ);
1268         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1269
1270 no_cleanup:
1271         qdio_shutdown_thinint(irq_ptr);
1272
1273         /* restore interrupt handler */
1274         if ((void *)cdev->handler == (void *)qdio_int_handler)
1275                 cdev->handler = irq_ptr->orig_handler;
1276         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1277
1278         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1279         mutex_unlock(&irq_ptr->setup_mutex);
1280         if (rc)
1281                 return rc;
1282         return 0;
1283 }
1284 EXPORT_SYMBOL_GPL(qdio_shutdown);
1285
1286 /**
1287  * qdio_free - free data structures for a qdio subchannel
1288  * @cdev: associated ccw device
1289  */
1290 int qdio_free(struct ccw_device *cdev)
1291 {
1292         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1293
1294         if (!irq_ptr)
1295                 return -ENODEV;
1296
1297         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1298         mutex_lock(&irq_ptr->setup_mutex);
1299
1300         if (irq_ptr->debug_area != NULL) {
1301                 debug_unregister(irq_ptr->debug_area);
1302                 irq_ptr->debug_area = NULL;
1303         }
1304         cdev->private->qdio_data = NULL;
1305         mutex_unlock(&irq_ptr->setup_mutex);
1306
1307         qdio_release_memory(irq_ptr);
1308         return 0;
1309 }
1310 EXPORT_SYMBOL_GPL(qdio_free);
1311
1312 /**
1313  * qdio_allocate - allocate qdio queues and associated data
1314  * @init_data: initialization data
1315  */
1316 int qdio_allocate(struct qdio_initialize *init_data)
1317 {
1318         struct qdio_irq *irq_ptr;
1319
1320         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1321
1322         if ((init_data->no_input_qs && !init_data->input_handler) ||
1323             (init_data->no_output_qs && !init_data->output_handler))
1324                 return -EINVAL;
1325
1326         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1327             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1328                 return -EINVAL;
1329
1330         if ((!init_data->input_sbal_addr_array) ||
1331             (!init_data->output_sbal_addr_array))
1332                 return -EINVAL;
1333
1334         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1335         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1336         if (!irq_ptr)
1337                 goto out_err;
1338
1339         mutex_init(&irq_ptr->setup_mutex);
1340         qdio_allocate_dbf(init_data, irq_ptr);
1341
1342         /*
1343          * Allocate a page for the chsc calls in qdio_establish.
1344          * Must be pre-allocated since a zfcp recovery will call
1345          * qdio_establish. In case of low memory and swap on a zfcp disk
1346          * we may not be able to allocate memory otherwise.
1347          */
1348         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1349         if (!irq_ptr->chsc_page)
1350                 goto out_rel;
1351
1352         /* qdr is used in ccw1.cda which is u32 */
1353         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1354         if (!irq_ptr->qdr)
1355                 goto out_rel;
1356         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1357
1358         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1359                              init_data->no_output_qs))
1360                 goto out_rel;
1361
1362         init_data->cdev->private->qdio_data = irq_ptr;
1363         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1364         return 0;
1365 out_rel:
1366         qdio_release_memory(irq_ptr);
1367 out_err:
1368         return -ENOMEM;
1369 }
1370 EXPORT_SYMBOL_GPL(qdio_allocate);
1371
1372 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1373 {
1374         struct qdio_q *q = irq_ptr->input_qs[0];
1375         int i, use_cq = 0;
1376
1377         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1378                 use_cq = 1;
1379
1380         for_each_output_queue(irq_ptr, q, i) {
1381                 if (use_cq) {
1382                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1383                                 use_cq = 0;
1384                                 continue;
1385                         }
1386                 } else
1387                         qdio_disable_async_operation(&q->u.out);
1388         }
1389         DBF_EVENT("use_cq:%d", use_cq);
1390 }
1391
1392 /**
1393  * qdio_establish - establish queues on a qdio subchannel
1394  * @init_data: initialization data
1395  */
1396 int qdio_establish(struct qdio_initialize *init_data)
1397 {
1398         struct qdio_irq *irq_ptr;
1399         struct ccw_device *cdev = init_data->cdev;
1400         unsigned long saveflags;
1401         int rc;
1402
1403         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1404
1405         irq_ptr = cdev->private->qdio_data;
1406         if (!irq_ptr)
1407                 return -ENODEV;
1408
1409         if (cdev->private->state != DEV_STATE_ONLINE)
1410                 return -EINVAL;
1411
1412         mutex_lock(&irq_ptr->setup_mutex);
1413         qdio_setup_irq(init_data);
1414
1415         rc = qdio_establish_thinint(irq_ptr);
1416         if (rc) {
1417                 mutex_unlock(&irq_ptr->setup_mutex);
1418                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1419                 return rc;
1420         }
1421
1422         /* establish q */
1423         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1424         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1425         irq_ptr->ccw.count = irq_ptr->equeue.count;
1426         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1427
1428         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1429         ccw_device_set_options_mask(cdev, 0);
1430
1431         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1432         if (rc) {
1433                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1434                 DBF_ERROR("rc:%4x", rc);
1435         }
1436         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1437
1438         if (rc) {
1439                 mutex_unlock(&irq_ptr->setup_mutex);
1440                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1441                 return rc;
1442         }
1443
1444         wait_event_interruptible_timeout(cdev->private->wait_q,
1445                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1446                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1447
1448         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1449                 mutex_unlock(&irq_ptr->setup_mutex);
1450                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1451                 return -EIO;
1452         }
1453
1454         qdio_setup_ssqd_info(irq_ptr);
1455         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1456
1457         qdio_detect_hsicq(irq_ptr);
1458
1459         /* qebsm is now setup if available, initialize buffer states */
1460         qdio_init_buf_states(irq_ptr);
1461
1462         mutex_unlock(&irq_ptr->setup_mutex);
1463         qdio_print_subchannel_info(irq_ptr, cdev);
1464         qdio_setup_debug_entries(irq_ptr, cdev);
1465         return 0;
1466 }
1467 EXPORT_SYMBOL_GPL(qdio_establish);
1468
1469 /**
1470  * qdio_activate - activate queues on a qdio subchannel
1471  * @cdev: associated cdev
1472  */
1473 int qdio_activate(struct ccw_device *cdev)
1474 {
1475         struct qdio_irq *irq_ptr;
1476         int rc;
1477         unsigned long saveflags;
1478
1479         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1480
1481         irq_ptr = cdev->private->qdio_data;
1482         if (!irq_ptr)
1483                 return -ENODEV;
1484
1485         if (cdev->private->state != DEV_STATE_ONLINE)
1486                 return -EINVAL;
1487
1488         mutex_lock(&irq_ptr->setup_mutex);
1489         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1490                 rc = -EBUSY;
1491                 goto out;
1492         }
1493
1494         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1495         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1496         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1497         irq_ptr->ccw.cda = 0;
1498
1499         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1500         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1501
1502         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1503                               0, DOIO_DENY_PREFETCH);
1504         if (rc) {
1505                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1506                 DBF_ERROR("rc:%4x", rc);
1507         }
1508         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1509
1510         if (rc)
1511                 goto out;
1512
1513         if (is_thinint_irq(irq_ptr))
1514                 tiqdio_add_input_queues(irq_ptr);
1515
1516         /* wait for subchannel to become active */
1517         msleep(5);
1518
1519         switch (irq_ptr->state) {
1520         case QDIO_IRQ_STATE_STOPPED:
1521         case QDIO_IRQ_STATE_ERR:
1522                 rc = -EIO;
1523                 break;
1524         default:
1525                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1526                 rc = 0;
1527         }
1528 out:
1529         mutex_unlock(&irq_ptr->setup_mutex);
1530         return rc;
1531 }
1532 EXPORT_SYMBOL_GPL(qdio_activate);
1533
1534 static inline int buf_in_between(int bufnr, int start, int count)
1535 {
1536         int end = add_buf(start, count);
1537
1538         if (end > start) {
1539                 if (bufnr >= start && bufnr < end)
1540                         return 1;
1541                 else
1542                         return 0;
1543         }
1544
1545         /* wrap-around case */
1546         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1547             (bufnr < end))
1548                 return 1;
1549         else
1550                 return 0;
1551 }
1552
1553 /**
1554  * handle_inbound - reset processed input buffers
1555  * @q: queue containing the buffers
1556  * @callflags: flags
1557  * @bufnr: first buffer to process
1558  * @count: how many buffers are emptied
1559  */
1560 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1561                           int bufnr, int count)
1562 {
1563         int used, diff;
1564
1565         qperf_inc(q, inbound_call);
1566
1567         if (!q->u.in.polling)
1568                 goto set;
1569
1570         /* protect against stop polling setting an ACK for an emptied slsb */
1571         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1572                 /* overwriting everything, just delete polling status */
1573                 q->u.in.polling = 0;
1574                 q->u.in.ack_count = 0;
1575                 goto set;
1576         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1577                 if (is_qebsm(q)) {
1578                         /* partial overwrite, just update ack_start */
1579                         diff = add_buf(bufnr, count);
1580                         diff = sub_buf(diff, q->u.in.ack_start);
1581                         q->u.in.ack_count -= diff;
1582                         if (q->u.in.ack_count <= 0) {
1583                                 q->u.in.polling = 0;
1584                                 q->u.in.ack_count = 0;
1585                                 goto set;
1586                         }
1587                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1588                 }
1589                 else
1590                         /* the only ACK will be deleted, so stop polling */
1591                         q->u.in.polling = 0;
1592         }
1593
1594 set:
1595         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1596
1597         used = atomic_add_return(count, &q->nr_buf_used) - count;
1598         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1599
1600         if (need_siga_in(q))
1601                 return qdio_siga_input(q);
1602
1603         return 0;
1604 }
1605
1606 /**
1607  * handle_outbound - process filled outbound buffers
1608  * @q: queue containing the buffers
1609  * @callflags: flags
1610  * @bufnr: first buffer to process
1611  * @count: how many buffers are filled
1612  */
1613 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1614                            int bufnr, int count)
1615 {
1616         unsigned char state = 0;
1617         int used, rc = 0;
1618
1619         qperf_inc(q, outbound_call);
1620
1621         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1622         used = atomic_add_return(count, &q->nr_buf_used);
1623         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1624
1625         if (used == QDIO_MAX_BUFFERS_PER_Q)
1626                 qperf_inc(q, outbound_queue_full);
1627
1628         if (callflags & QDIO_FLAG_PCI_OUT) {
1629                 q->u.out.pci_out_enabled = 1;
1630                 qperf_inc(q, pci_request_int);
1631         } else
1632                 q->u.out.pci_out_enabled = 0;
1633
1634         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1635                 unsigned long phys_aob = 0;
1636
1637                 /* One SIGA-W per buffer required for unicast HSI */
1638                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1639
1640                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1641
1642                 rc = qdio_kick_outbound_q(q, phys_aob);
1643         } else if (need_siga_sync(q)) {
1644                 rc = qdio_siga_sync_q(q);
1645         } else {
1646                 /* try to fast requeue buffers */
1647                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1648                 if (state != SLSB_CU_OUTPUT_PRIMED)
1649                         rc = qdio_kick_outbound_q(q, 0);
1650                 else
1651                         qperf_inc(q, fast_requeue);
1652         }
1653
1654         /* in case of SIGA errors we must process the error immediately */
1655         if (used >= q->u.out.scan_threshold || rc)
1656                 tasklet_schedule(&q->tasklet);
1657         else
1658                 /* free the SBALs in case of no further traffic */
1659                 if (!timer_pending(&q->u.out.timer))
1660                         mod_timer(&q->u.out.timer, jiffies + HZ);
1661         return rc;
1662 }
1663
1664 /**
1665  * do_QDIO - process input or output buffers
1666  * @cdev: associated ccw_device for the qdio subchannel
1667  * @callflags: input or output and special flags from the program
1668  * @q_nr: queue number
1669  * @bufnr: buffer number
1670  * @count: how many buffers to process
1671  */
1672 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1673             int q_nr, unsigned int bufnr, unsigned int count)
1674 {
1675         struct qdio_irq *irq_ptr;
1676
1677
1678         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1679                 return -EINVAL;
1680
1681         irq_ptr = cdev->private->qdio_data;
1682         if (!irq_ptr)
1683                 return -ENODEV;
1684
1685         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1686                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1687
1688         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1689                 return -EBUSY;
1690         if (!count)
1691                 return 0;
1692         if (callflags & QDIO_FLAG_SYNC_INPUT)
1693                 return handle_inbound(irq_ptr->input_qs[q_nr],
1694                                       callflags, bufnr, count);
1695         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1696                 return handle_outbound(irq_ptr->output_qs[q_nr],
1697                                        callflags, bufnr, count);
1698         return -EINVAL;
1699 }
1700 EXPORT_SYMBOL_GPL(do_QDIO);
1701
1702 /**
1703  * qdio_start_irq - process input buffers
1704  * @cdev: associated ccw_device for the qdio subchannel
1705  * @nr: input queue number
1706  *
1707  * Return codes
1708  *   0 - success
1709  *   1 - irqs not started since new data is available
1710  */
1711 int qdio_start_irq(struct ccw_device *cdev, int nr)
1712 {
1713         struct qdio_q *q;
1714         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1715
1716         if (!irq_ptr)
1717                 return -ENODEV;
1718         q = irq_ptr->input_qs[nr];
1719
1720         WARN_ON(queue_irqs_enabled(q));
1721
1722         if (!shared_ind(q))
1723                 xchg(q->irq_ptr->dsci, 0);
1724
1725         qdio_stop_polling(q);
1726         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1727
1728         /*
1729          * We need to check again to not lose initiative after
1730          * resetting the ACK state.
1731          */
1732         if (!shared_ind(q) && *q->irq_ptr->dsci)
1733                 goto rescan;
1734         if (!qdio_inbound_q_done(q))
1735                 goto rescan;
1736         return 0;
1737
1738 rescan:
1739         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1740                              &q->u.in.queue_irq_state))
1741                 return 0;
1742         else
1743                 return 1;
1744
1745 }
1746 EXPORT_SYMBOL(qdio_start_irq);
1747
1748 /**
1749  * qdio_get_next_buffers - process input buffers
1750  * @cdev: associated ccw_device for the qdio subchannel
1751  * @nr: input queue number
1752  * @bufnr: first filled buffer number
1753  * @error: buffers are in error state
1754  *
1755  * Return codes
1756  *   < 0 - error
1757  *   = 0 - no new buffers found
1758  *   > 0 - number of processed buffers
1759  */
1760 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1761                           int *error)
1762 {
1763         struct qdio_q *q;
1764         int start, end;
1765         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1766
1767         if (!irq_ptr)
1768                 return -ENODEV;
1769         q = irq_ptr->input_qs[nr];
1770         WARN_ON(queue_irqs_enabled(q));
1771
1772         /*
1773          * Cannot rely on automatic sync after interrupt since queues may
1774          * also be examined without interrupt.
1775          */
1776         if (need_siga_sync(q))
1777                 qdio_sync_queues(q);
1778
1779         /* check the PCI capable outbound queues. */
1780         qdio_check_outbound_after_thinint(q);
1781
1782         if (!qdio_inbound_q_moved(q))
1783                 return 0;
1784
1785         /* Note: upper-layer MUST stop processing immediately here ... */
1786         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1787                 return -EIO;
1788
1789         start = q->first_to_kick;
1790         end = q->first_to_check;
1791         *bufnr = start;
1792         *error = q->qdio_error;
1793
1794         /* for the next time */
1795         q->first_to_kick = end;
1796         q->qdio_error = 0;
1797         return sub_buf(end, start);
1798 }
1799 EXPORT_SYMBOL(qdio_get_next_buffers);
1800
1801 /**
1802  * qdio_stop_irq - disable interrupt processing for the device
1803  * @cdev: associated ccw_device for the qdio subchannel
1804  * @nr: input queue number
1805  *
1806  * Return codes
1807  *   0 - interrupts were already disabled
1808  *   1 - interrupts successfully disabled
1809  */
1810 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1811 {
1812         struct qdio_q *q;
1813         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1814
1815         if (!irq_ptr)
1816                 return -ENODEV;
1817         q = irq_ptr->input_qs[nr];
1818
1819         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1820                              &q->u.in.queue_irq_state))
1821                 return 0;
1822         else
1823                 return 1;
1824 }
1825 EXPORT_SYMBOL(qdio_stop_irq);
1826
1827 static int __init init_QDIO(void)
1828 {
1829         int rc;
1830
1831         rc = qdio_debug_init();
1832         if (rc)
1833                 return rc;
1834         rc = qdio_setup_init();
1835         if (rc)
1836                 goto out_debug;
1837         rc = tiqdio_allocate_memory();
1838         if (rc)
1839                 goto out_cache;
1840         rc = tiqdio_register_thinints();
1841         if (rc)
1842                 goto out_ti;
1843         return 0;
1844
1845 out_ti:
1846         tiqdio_free_memory();
1847 out_cache:
1848         qdio_setup_exit();
1849 out_debug:
1850         qdio_debug_exit();
1851         return rc;
1852 }
1853
1854 static void __exit exit_QDIO(void)
1855 {
1856         tiqdio_unregister_thinints();
1857         tiqdio_free_memory();
1858         qdio_setup_exit();
1859         qdio_debug_exit();
1860 }
1861
1862 module_init(init_QDIO);
1863 module_exit(exit_QDIO);