s390: add missing module.h/export.h includes
[linux-2.6.git] / drivers / s390 / cio / qdio_setup.c
1 /*
2  * driver/s390/cio/qdio_setup.c
3  *
4  * qdio queue initialization
5  *
6  * Copyright (C) IBM Corp. 2008
7  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
8  */
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/export.h>
12 #include <asm/qdio.h>
13
14 #include "cio.h"
15 #include "css.h"
16 #include "device.h"
17 #include "ioasm.h"
18 #include "chsc.h"
19 #include "qdio.h"
20 #include "qdio_debug.h"
21
22 static struct kmem_cache *qdio_q_cache;
23 static struct kmem_cache *qdio_aob_cache;
24
25 struct qaob *qdio_allocate_aob()
26 {
27         struct qaob *aob;
28
29         aob = kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
30         return aob;
31 }
32 EXPORT_SYMBOL_GPL(qdio_allocate_aob);
33
34 void qdio_release_aob(struct qaob *aob)
35 {
36         kmem_cache_free(qdio_aob_cache, aob);
37 }
38 EXPORT_SYMBOL_GPL(qdio_release_aob);
39
40 /*
41  * qebsm is only available under 64bit but the adapter sets the feature
42  * flag anyway, so we manually override it.
43  */
44 static inline int qebsm_possible(void)
45 {
46 #ifdef CONFIG_64BIT
47         return css_general_characteristics.qebsm;
48 #endif
49         return 0;
50 }
51
52 /*
53  * qib_param_field: pointer to 128 bytes or NULL, if no param field
54  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
55  */
56 static void set_impl_params(struct qdio_irq *irq_ptr,
57                             unsigned int qib_param_field_format,
58                             unsigned char *qib_param_field,
59                             unsigned long *input_slib_elements,
60                             unsigned long *output_slib_elements)
61 {
62         struct qdio_q *q;
63         int i, j;
64
65         if (!irq_ptr)
66                 return;
67
68         irq_ptr->qib.pfmt = qib_param_field_format;
69         if (qib_param_field)
70                 memcpy(irq_ptr->qib.parm, qib_param_field,
71                        QDIO_MAX_BUFFERS_PER_Q);
72
73         if (!input_slib_elements)
74                 goto output;
75
76         for_each_input_queue(irq_ptr, q, i) {
77                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
78                         q->slib->slibe[j].parms =
79                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
80         }
81 output:
82         if (!output_slib_elements)
83                 return;
84
85         for_each_output_queue(irq_ptr, q, i) {
86                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
87                         q->slib->slibe[j].parms =
88                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
89         }
90 }
91
92 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
93 {
94         struct qdio_q *q;
95         int i;
96
97         for (i = 0; i < nr_queues; i++) {
98                 q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
99                 if (!q)
100                         return -ENOMEM;
101
102                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
103                 if (!q->slib) {
104                         kmem_cache_free(qdio_q_cache, q);
105                         return -ENOMEM;
106                 }
107                 irq_ptr_qs[i] = q;
108         }
109         return 0;
110 }
111
112 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
113 {
114         int rc;
115
116         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
117         if (rc)
118                 return rc;
119         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
120         return rc;
121 }
122
123 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
124                               qdio_handler_t *handler, int i)
125 {
126         struct slib *slib = q->slib;
127
128         /* queue must be cleared for qdio_establish */
129         memset(q, 0, sizeof(*q));
130         memset(slib, 0, PAGE_SIZE);
131         q->slib = slib;
132         q->irq_ptr = irq_ptr;
133         q->mask = 1 << (31 - i);
134         q->nr = i;
135         q->handler = handler;
136 }
137
138 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
139                                 void **sbals_array, int i)
140 {
141         struct qdio_q *prev;
142         int j;
143
144         DBF_HEX(&q, sizeof(void *));
145         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
146
147         /* fill in sbal */
148         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
149                 q->sbal[j] = *sbals_array++;
150                 BUG_ON((unsigned long)q->sbal[j] & 0xff);
151         }
152
153         /* fill in slib */
154         if (i > 0) {
155                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
156                         : irq_ptr->output_qs[i - 1];
157                 prev->slib->nsliba = (unsigned long)q->slib;
158         }
159
160         q->slib->sla = (unsigned long)q->sl;
161         q->slib->slsba = (unsigned long)&q->slsb.val[0];
162
163         /* fill in sl */
164         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
165                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
166 }
167
168 static void setup_queues(struct qdio_irq *irq_ptr,
169                          struct qdio_initialize *qdio_init)
170 {
171         struct qdio_q *q;
172         void **input_sbal_array = qdio_init->input_sbal_addr_array;
173         void **output_sbal_array = qdio_init->output_sbal_addr_array;
174         struct qdio_outbuf_state *output_sbal_state_array =
175                                   qdio_init->output_sbal_state_array;
176         int i;
177
178         for_each_input_queue(irq_ptr, q, i) {
179                 DBF_EVENT("inq:%1d", i);
180                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
181
182                 q->is_input_q = 1;
183                 q->u.in.queue_start_poll = qdio_init->queue_start_poll[i];
184
185                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
186                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
187
188                 if (is_thinint_irq(irq_ptr)) {
189                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
190                                      (unsigned long) q);
191                 } else {
192                         tasklet_init(&q->tasklet, qdio_inbound_processing,
193                                      (unsigned long) q);
194                 }
195         }
196
197         for_each_output_queue(irq_ptr, q, i) {
198                 DBF_EVENT("outq:%1d", i);
199                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
200
201                 q->u.out.sbal_state = output_sbal_state_array;
202                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
203
204                 q->is_input_q = 0;
205                 q->u.out.scan_threshold = qdio_init->scan_threshold;
206                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
207                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
208
209                 tasklet_init(&q->tasklet, qdio_outbound_processing,
210                              (unsigned long) q);
211                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
212                             &qdio_outbound_timer, (unsigned long)q);
213         }
214 }
215
216 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
217 {
218         if (qdioac & AC1_SIGA_INPUT_NEEDED)
219                 irq_ptr->siga_flag.input = 1;
220         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
221                 irq_ptr->siga_flag.output = 1;
222         if (qdioac & AC1_SIGA_SYNC_NEEDED)
223                 irq_ptr->siga_flag.sync = 1;
224         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
225                 irq_ptr->siga_flag.sync_after_ai = 1;
226         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
227                 irq_ptr->siga_flag.sync_out_after_pci = 1;
228 }
229
230 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
231                                   unsigned char qdioac, unsigned long token)
232 {
233         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
234                 goto no_qebsm;
235         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
236             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
237                 goto no_qebsm;
238
239         irq_ptr->sch_token = token;
240
241         DBF_EVENT("V=V:1");
242         DBF_EVENT("%8lx", irq_ptr->sch_token);
243         return;
244
245 no_qebsm:
246         irq_ptr->sch_token = 0;
247         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
248         DBF_EVENT("noV=V");
249 }
250
251 /*
252  * If there is a qdio_irq we use the chsc_page and store the information
253  * in the qdio_irq, otherwise we copy it to the specified structure.
254  */
255 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
256                         struct subchannel_id *schid,
257                         struct qdio_ssqd_desc *data)
258 {
259         struct chsc_ssqd_area *ssqd;
260         int rc;
261
262         DBF_EVENT("getssqd:%4x", schid->sch_no);
263         if (irq_ptr != NULL)
264                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
265         else
266                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
267         memset(ssqd, 0, PAGE_SIZE);
268
269         ssqd->request = (struct chsc_header) {
270                 .length = 0x0010,
271                 .code   = 0x0024,
272         };
273         ssqd->first_sch = schid->sch_no;
274         ssqd->last_sch = schid->sch_no;
275         ssqd->ssid = schid->ssid;
276
277         if (chsc(ssqd))
278                 return -EIO;
279         rc = chsc_error_from_response(ssqd->response.code);
280         if (rc)
281                 return rc;
282
283         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
284             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
285             (ssqd->qdio_ssqd.sch != schid->sch_no))
286                 return -EINVAL;
287
288         if (irq_ptr != NULL)
289                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
290                        sizeof(struct qdio_ssqd_desc));
291         else {
292                 memcpy(data, &ssqd->qdio_ssqd,
293                        sizeof(struct qdio_ssqd_desc));
294                 free_page((unsigned long)ssqd);
295         }
296         return 0;
297 }
298
299 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
300 {
301         unsigned char qdioac;
302         int rc;
303
304         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
305         if (rc) {
306                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
307                 DBF_ERROR("rc:%x", rc);
308                 /* all flags set, worst case */
309                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
310                          AC1_SIGA_SYNC_NEEDED;
311         } else
312                 qdioac = irq_ptr->ssqd_desc.qdioac1;
313
314         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
315         process_ac_flags(irq_ptr, qdioac);
316         DBF_EVENT("qdioac:%4x", qdioac);
317 }
318
319 void qdio_release_memory(struct qdio_irq *irq_ptr)
320 {
321         struct qdio_q *q;
322         int i;
323
324         /*
325          * Must check queue array manually since irq_ptr->nr_input_queues /
326          * irq_ptr->nr_input_queues may not yet be set.
327          */
328         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
329                 q = irq_ptr->input_qs[i];
330                 if (q) {
331                         free_page((unsigned long) q->slib);
332                         kmem_cache_free(qdio_q_cache, q);
333                 }
334         }
335         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
336                 q = irq_ptr->output_qs[i];
337                 if (q) {
338                         if (q->u.out.use_cq) {
339                                 int n;
340
341                                 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
342                                         struct qaob *aob = q->u.out.aobs[n];
343                                         if (aob) {
344                                                 qdio_release_aob(aob);
345                                                 q->u.out.aobs[n] = NULL;
346                                         }
347                                 }
348
349                                 qdio_disable_async_operation(&q->u.out);
350                         }
351                         free_page((unsigned long) q->slib);
352                         kmem_cache_free(qdio_q_cache, q);
353                 }
354         }
355         free_page((unsigned long) irq_ptr->qdr);
356         free_page(irq_ptr->chsc_page);
357         free_page((unsigned long) irq_ptr);
358 }
359
360 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
361                                      struct qdio_q **irq_ptr_qs,
362                                      int i, int nr)
363 {
364         irq_ptr->qdr->qdf0[i + nr].sliba =
365                 (unsigned long)irq_ptr_qs[i]->slib;
366
367         irq_ptr->qdr->qdf0[i + nr].sla =
368                 (unsigned long)irq_ptr_qs[i]->sl;
369
370         irq_ptr->qdr->qdf0[i + nr].slsba =
371                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
372
373         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
374         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
375         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
376         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
377 }
378
379 static void setup_qdr(struct qdio_irq *irq_ptr,
380                       struct qdio_initialize *qdio_init)
381 {
382         int i;
383
384         irq_ptr->qdr->qfmt = qdio_init->q_format;
385         irq_ptr->qdr->ac = qdio_init->qdr_ac;
386         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
387         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
388         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
389         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
390         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
391         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
392
393         for (i = 0; i < qdio_init->no_input_qs; i++)
394                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
395
396         for (i = 0; i < qdio_init->no_output_qs; i++)
397                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
398                                          qdio_init->no_input_qs);
399 }
400
401 static void setup_qib(struct qdio_irq *irq_ptr,
402                       struct qdio_initialize *init_data)
403 {
404         if (qebsm_possible())
405                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
406
407         irq_ptr->qib.rflags |= init_data->qib_rflags;
408
409         irq_ptr->qib.qfmt = init_data->q_format;
410         if (init_data->no_input_qs)
411                 irq_ptr->qib.isliba =
412                         (unsigned long)(irq_ptr->input_qs[0]->slib);
413         if (init_data->no_output_qs)
414                 irq_ptr->qib.osliba =
415                         (unsigned long)(irq_ptr->output_qs[0]->slib);
416         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
417 }
418
419 int qdio_setup_irq(struct qdio_initialize *init_data)
420 {
421         struct ciw *ciw;
422         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
423         int rc;
424
425         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
426         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
427         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
428         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
429         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
430
431         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
432         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
433
434         /* wipes qib.ac, required by ar7063 */
435         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
436
437         irq_ptr->int_parm = init_data->int_parm;
438         irq_ptr->nr_input_qs = init_data->no_input_qs;
439         irq_ptr->nr_output_qs = init_data->no_output_qs;
440
441         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
442         irq_ptr->cdev = init_data->cdev;
443         setup_queues(irq_ptr, init_data);
444
445         setup_qib(irq_ptr, init_data);
446         qdio_setup_thinint(irq_ptr);
447         set_impl_params(irq_ptr, init_data->qib_param_field_format,
448                         init_data->qib_param_field,
449                         init_data->input_slib_elements,
450                         init_data->output_slib_elements);
451
452         /* fill input and output descriptors */
453         setup_qdr(irq_ptr, init_data);
454
455         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
456
457         /* get qdio commands */
458         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
459         if (!ciw) {
460                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
461                 rc = -EINVAL;
462                 goto out_err;
463         }
464         irq_ptr->equeue = *ciw;
465
466         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
467         if (!ciw) {
468                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
469                 rc = -EINVAL;
470                 goto out_err;
471         }
472         irq_ptr->aqueue = *ciw;
473
474         /* set new interrupt handler */
475         irq_ptr->orig_handler = init_data->cdev->handler;
476         init_data->cdev->handler = qdio_int_handler;
477         return 0;
478 out_err:
479         qdio_release_memory(irq_ptr);
480         return rc;
481 }
482
483 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
484                                 struct ccw_device *cdev)
485 {
486         char s[80];
487
488         snprintf(s, 80, "qdio: %s %s on SC %x using "
489                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s\n",
490                  dev_name(&cdev->dev),
491                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
492                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
493                  irq_ptr->schid.sch_no,
494                  is_thinint_irq(irq_ptr),
495                  (irq_ptr->sch_token) ? 1 : 0,
496                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
497                  css_general_characteristics.aif_tdd,
498                  (irq_ptr->siga_flag.input) ? "R" : " ",
499                  (irq_ptr->siga_flag.output) ? "W" : " ",
500                  (irq_ptr->siga_flag.sync) ? "S" : " ",
501                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
502                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
503         printk(KERN_INFO "%s", s);
504 }
505
506 int qdio_enable_async_operation(struct qdio_output_q *outq)
507 {
508         outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
509                              GFP_ATOMIC);
510         if (!outq->aobs) {
511                 outq->use_cq = 0;
512                 return -ENOMEM;
513         }
514         outq->use_cq = 1;
515         return 0;
516 }
517
518 void qdio_disable_async_operation(struct qdio_output_q *q)
519 {
520         kfree(q->aobs);
521         q->aobs = NULL;
522         q->use_cq = 0;
523 }
524
525 int __init qdio_setup_init(void)
526 {
527         int rc;
528
529         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
530                                          256, 0, NULL);
531         if (!qdio_q_cache)
532                 return -ENOMEM;
533
534         qdio_aob_cache = kmem_cache_create("qdio_aob",
535                                         sizeof(struct qaob),
536                                         sizeof(struct qaob),
537                                         0,
538                                         NULL);
539         if (!qdio_aob_cache) {
540                 rc = -ENOMEM;
541                 goto free_qdio_q_cache;
542         }
543
544         /* Check for OSA/FCP thin interrupts (bit 67). */
545         DBF_EVENT("thinint:%1d",
546                   (css_general_characteristics.aif_osa) ? 1 : 0);
547
548         /* Check for QEBSM support in general (bit 58). */
549         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
550         rc = 0;
551 out:
552         return rc;
553 free_qdio_q_cache:
554         kmem_cache_destroy(qdio_q_cache);
555         goto out;
556 }
557
558 void qdio_setup_exit(void)
559 {
560         kmem_cache_destroy(qdio_aob_cache);
561         kmem_cache_destroy(qdio_q_cache);
562 }