dd8bd670a6b8fd290296060b50fbb305dbf2e508
[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 <asm/qdio.h>
12
13 #include "cio.h"
14 #include "css.h"
15 #include "device.h"
16 #include "ioasm.h"
17 #include "chsc.h"
18 #include "qdio.h"
19 #include "qdio_debug.h"
20
21 static struct kmem_cache *qdio_q_cache;
22 static struct kmem_cache *qdio_aob_cache;
23
24 struct qaob *qdio_allocate_aob()
25 {
26         struct qaob *aob;
27
28         aob = kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
29         return aob;
30 }
31 EXPORT_SYMBOL_GPL(qdio_allocate_aob);
32
33 void qdio_release_aob(struct qaob *aob)
34 {
35         kmem_cache_free(qdio_aob_cache, aob);
36 }
37 EXPORT_SYMBOL_GPL(qdio_release_aob);
38
39 /*
40  * qebsm is only available under 64bit but the adapter sets the feature
41  * flag anyway, so we manually override it.
42  */
43 static inline int qebsm_possible(void)
44 {
45 #ifdef CONFIG_64BIT
46         return css_general_characteristics.qebsm;
47 #endif
48         return 0;
49 }
50
51 /*
52  * qib_param_field: pointer to 128 bytes or NULL, if no param field
53  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
54  */
55 static void set_impl_params(struct qdio_irq *irq_ptr,
56                             unsigned int qib_param_field_format,
57                             unsigned char *qib_param_field,
58                             unsigned long *input_slib_elements,
59                             unsigned long *output_slib_elements)
60 {
61         struct qdio_q *q;
62         int i, j;
63
64         if (!irq_ptr)
65                 return;
66
67         irq_ptr->qib.pfmt = qib_param_field_format;
68         if (qib_param_field)
69                 memcpy(irq_ptr->qib.parm, qib_param_field,
70                        QDIO_MAX_BUFFERS_PER_Q);
71
72         if (!input_slib_elements)
73                 goto output;
74
75         for_each_input_queue(irq_ptr, q, i) {
76                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
77                         q->slib->slibe[j].parms =
78                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
79         }
80 output:
81         if (!output_slib_elements)
82                 return;
83
84         for_each_output_queue(irq_ptr, q, i) {
85                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
86                         q->slib->slibe[j].parms =
87                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
88         }
89 }
90
91 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
92 {
93         struct qdio_q *q;
94         int i;
95
96         for (i = 0; i < nr_queues; i++) {
97                 q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
98                 if (!q)
99                         return -ENOMEM;
100
101                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
102                 if (!q->slib) {
103                         kmem_cache_free(qdio_q_cache, q);
104                         return -ENOMEM;
105                 }
106                 irq_ptr_qs[i] = q;
107         }
108         return 0;
109 }
110
111 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
112 {
113         int rc;
114
115         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
116         if (rc)
117                 return rc;
118         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
119         return rc;
120 }
121
122 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
123                               qdio_handler_t *handler, int i)
124 {
125         struct slib *slib = q->slib;
126
127         /* queue must be cleared for qdio_establish */
128         memset(q, 0, sizeof(*q));
129         memset(slib, 0, PAGE_SIZE);
130         q->slib = slib;
131         q->irq_ptr = irq_ptr;
132         q->mask = 1 << (31 - i);
133         q->nr = i;
134         q->handler = handler;
135 }
136
137 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
138                                 void **sbals_array, int i)
139 {
140         struct qdio_q *prev;
141         int j;
142
143         DBF_HEX(&q, sizeof(void *));
144         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
145
146         /* fill in sbal */
147         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
148                 q->sbal[j] = *sbals_array++;
149                 BUG_ON((unsigned long)q->sbal[j] & 0xff);
150         }
151
152         /* fill in slib */
153         if (i > 0) {
154                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
155                         : irq_ptr->output_qs[i - 1];
156                 prev->slib->nsliba = (unsigned long)q->slib;
157         }
158
159         q->slib->sla = (unsigned long)q->sl;
160         q->slib->slsba = (unsigned long)&q->slsb.val[0];
161
162         /* fill in sl */
163         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
164                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
165 }
166
167 static void setup_queues(struct qdio_irq *irq_ptr,
168                          struct qdio_initialize *qdio_init)
169 {
170         struct qdio_q *q;
171         void **input_sbal_array = qdio_init->input_sbal_addr_array;
172         void **output_sbal_array = qdio_init->output_sbal_addr_array;
173         struct qdio_outbuf_state *output_sbal_state_array =
174                                   qdio_init->output_sbal_state_array;
175         int i;
176
177         for_each_input_queue(irq_ptr, q, i) {
178                 DBF_EVENT("inq:%1d", i);
179                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
180
181                 q->is_input_q = 1;
182                 q->u.in.queue_start_poll = qdio_init->queue_start_poll[i];
183
184                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
185                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
186
187                 if (is_thinint_irq(irq_ptr)) {
188                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
189                                      (unsigned long) q);
190                 } else {
191                         tasklet_init(&q->tasklet, qdio_inbound_processing,
192                                      (unsigned long) q);
193                 }
194         }
195
196         for_each_output_queue(irq_ptr, q, i) {
197                 DBF_EVENT("outq:%1d", i);
198                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
199
200                 q->u.out.sbal_state = output_sbal_state_array;
201                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
202
203                 q->is_input_q = 0;
204                 q->u.out.scan_threshold = qdio_init->scan_threshold;
205                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
206                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
207
208                 tasklet_init(&q->tasklet, qdio_outbound_processing,
209                              (unsigned long) q);
210                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
211                             &qdio_outbound_timer, (unsigned long)q);
212         }
213 }
214
215 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
216 {
217         if (qdioac & AC1_SIGA_INPUT_NEEDED)
218                 irq_ptr->siga_flag.input = 1;
219         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
220                 irq_ptr->siga_flag.output = 1;
221         if (qdioac & AC1_SIGA_SYNC_NEEDED)
222                 irq_ptr->siga_flag.sync = 1;
223         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
224                 irq_ptr->siga_flag.sync_after_ai = 1;
225         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
226                 irq_ptr->siga_flag.sync_out_after_pci = 1;
227 }
228
229 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
230                                   unsigned char qdioac, unsigned long token)
231 {
232         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
233                 goto no_qebsm;
234         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
235             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
236                 goto no_qebsm;
237
238         irq_ptr->sch_token = token;
239
240         DBF_EVENT("V=V:1");
241         DBF_EVENT("%8lx", irq_ptr->sch_token);
242         return;
243
244 no_qebsm:
245         irq_ptr->sch_token = 0;
246         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
247         DBF_EVENT("noV=V");
248 }
249
250 /*
251  * If there is a qdio_irq we use the chsc_page and store the information
252  * in the qdio_irq, otherwise we copy it to the specified structure.
253  */
254 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
255                         struct subchannel_id *schid,
256                         struct qdio_ssqd_desc *data)
257 {
258         struct chsc_ssqd_area *ssqd;
259         int rc;
260
261         DBF_EVENT("getssqd:%4x", schid->sch_no);
262         if (irq_ptr != NULL)
263                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
264         else
265                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
266         memset(ssqd, 0, PAGE_SIZE);
267
268         ssqd->request = (struct chsc_header) {
269                 .length = 0x0010,
270                 .code   = 0x0024,
271         };
272         ssqd->first_sch = schid->sch_no;
273         ssqd->last_sch = schid->sch_no;
274         ssqd->ssid = schid->ssid;
275
276         if (chsc(ssqd))
277                 return -EIO;
278         rc = chsc_error_from_response(ssqd->response.code);
279         if (rc)
280                 return rc;
281
282         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
283             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
284             (ssqd->qdio_ssqd.sch != schid->sch_no))
285                 return -EINVAL;
286
287         if (irq_ptr != NULL)
288                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
289                        sizeof(struct qdio_ssqd_desc));
290         else {
291                 memcpy(data, &ssqd->qdio_ssqd,
292                        sizeof(struct qdio_ssqd_desc));
293                 free_page((unsigned long)ssqd);
294         }
295         return 0;
296 }
297
298 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
299 {
300         unsigned char qdioac;
301         int rc;
302
303         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
304         if (rc) {
305                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
306                 DBF_ERROR("rc:%x", rc);
307                 /* all flags set, worst case */
308                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
309                          AC1_SIGA_SYNC_NEEDED;
310         } else
311                 qdioac = irq_ptr->ssqd_desc.qdioac1;
312
313         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
314         process_ac_flags(irq_ptr, qdioac);
315         DBF_EVENT("qdioac:%4x", qdioac);
316 }
317
318 void qdio_release_memory(struct qdio_irq *irq_ptr)
319 {
320         struct qdio_q *q;
321         int i;
322
323         /*
324          * Must check queue array manually since irq_ptr->nr_input_queues /
325          * irq_ptr->nr_input_queues may not yet be set.
326          */
327         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
328                 q = irq_ptr->input_qs[i];
329                 if (q) {
330                         free_page((unsigned long) q->slib);
331                         kmem_cache_free(qdio_q_cache, q);
332                 }
333         }
334         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
335                 q = irq_ptr->output_qs[i];
336                 if (q) {
337                         if (q->u.out.use_cq) {
338                                 int n;
339
340                                 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
341                                         struct qaob *aob = q->u.out.aobs[n];
342                                         if (aob) {
343                                                 qdio_release_aob(aob);
344                                                 q->u.out.aobs[n] = NULL;
345                                         }
346                                 }
347
348                                 qdio_disable_async_operation(&q->u.out);
349                         }
350                         free_page((unsigned long) q->slib);
351                         kmem_cache_free(qdio_q_cache, q);
352                 }
353         }
354         free_page((unsigned long) irq_ptr->qdr);
355         free_page(irq_ptr->chsc_page);
356         free_page((unsigned long) irq_ptr);
357 }
358
359 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
360                                      struct qdio_q **irq_ptr_qs,
361                                      int i, int nr)
362 {
363         irq_ptr->qdr->qdf0[i + nr].sliba =
364                 (unsigned long)irq_ptr_qs[i]->slib;
365
366         irq_ptr->qdr->qdf0[i + nr].sla =
367                 (unsigned long)irq_ptr_qs[i]->sl;
368
369         irq_ptr->qdr->qdf0[i + nr].slsba =
370                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
371
372         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
373         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
374         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
375         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
376 }
377
378 static void setup_qdr(struct qdio_irq *irq_ptr,
379                       struct qdio_initialize *qdio_init)
380 {
381         int i;
382
383         irq_ptr->qdr->qfmt = qdio_init->q_format;
384         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
385         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
386         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
387         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
388         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
389         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
390
391         for (i = 0; i < qdio_init->no_input_qs; i++)
392                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
393
394         for (i = 0; i < qdio_init->no_output_qs; i++)
395                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
396                                          qdio_init->no_input_qs);
397 }
398
399 static void setup_qib(struct qdio_irq *irq_ptr,
400                       struct qdio_initialize *init_data)
401 {
402         if (qebsm_possible())
403                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
404
405         irq_ptr->qib.rflags |= init_data->qib_rflags;
406
407         irq_ptr->qib.qfmt = init_data->q_format;
408         if (init_data->no_input_qs)
409                 irq_ptr->qib.isliba =
410                         (unsigned long)(irq_ptr->input_qs[0]->slib);
411         if (init_data->no_output_qs)
412                 irq_ptr->qib.osliba =
413                         (unsigned long)(irq_ptr->output_qs[0]->slib);
414         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
415 }
416
417 int qdio_setup_irq(struct qdio_initialize *init_data)
418 {
419         struct ciw *ciw;
420         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
421         int rc;
422
423         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
424         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
425         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
426         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
427         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
428
429         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
430         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
431
432         /* wipes qib.ac, required by ar7063 */
433         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
434
435         irq_ptr->int_parm = init_data->int_parm;
436         irq_ptr->nr_input_qs = init_data->no_input_qs;
437         irq_ptr->nr_output_qs = init_data->no_output_qs;
438
439         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
440         irq_ptr->cdev = init_data->cdev;
441         setup_queues(irq_ptr, init_data);
442
443         setup_qib(irq_ptr, init_data);
444         qdio_setup_thinint(irq_ptr);
445         set_impl_params(irq_ptr, init_data->qib_param_field_format,
446                         init_data->qib_param_field,
447                         init_data->input_slib_elements,
448                         init_data->output_slib_elements);
449
450         /* fill input and output descriptors */
451         setup_qdr(irq_ptr, init_data);
452
453         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
454
455         /* get qdio commands */
456         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
457         if (!ciw) {
458                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
459                 rc = -EINVAL;
460                 goto out_err;
461         }
462         irq_ptr->equeue = *ciw;
463
464         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
465         if (!ciw) {
466                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
467                 rc = -EINVAL;
468                 goto out_err;
469         }
470         irq_ptr->aqueue = *ciw;
471
472         /* set new interrupt handler */
473         irq_ptr->orig_handler = init_data->cdev->handler;
474         init_data->cdev->handler = qdio_int_handler;
475         return 0;
476 out_err:
477         qdio_release_memory(irq_ptr);
478         return rc;
479 }
480
481 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
482                                 struct ccw_device *cdev)
483 {
484         char s[80];
485
486         snprintf(s, 80, "qdio: %s %s on SC %x using "
487                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s\n",
488                  dev_name(&cdev->dev),
489                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
490                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
491                  irq_ptr->schid.sch_no,
492                  is_thinint_irq(irq_ptr),
493                  (irq_ptr->sch_token) ? 1 : 0,
494                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
495                  css_general_characteristics.aif_tdd,
496                  (irq_ptr->siga_flag.input) ? "R" : " ",
497                  (irq_ptr->siga_flag.output) ? "W" : " ",
498                  (irq_ptr->siga_flag.sync) ? "S" : " ",
499                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
500                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
501         printk(KERN_INFO "%s", s);
502 }
503
504 int qdio_enable_async_operation(struct qdio_output_q *outq)
505 {
506         outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
507                              GFP_ATOMIC);
508         if (!outq->aobs) {
509                 outq->use_cq = 0;
510                 return -ENOMEM;
511         }
512         outq->use_cq = 1;
513         return 0;
514 }
515
516 void qdio_disable_async_operation(struct qdio_output_q *q)
517 {
518         kfree(q->aobs);
519         q->aobs = NULL;
520         q->use_cq = 0;
521 }
522
523 int __init qdio_setup_init(void)
524 {
525         int rc;
526
527         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
528                                          256, 0, NULL);
529         if (!qdio_q_cache)
530                 return -ENOMEM;
531
532         qdio_aob_cache = kmem_cache_create("qdio_aob",
533                                         sizeof(struct qaob),
534                                         sizeof(struct qaob),
535                                         0,
536                                         NULL);
537         if (!qdio_aob_cache) {
538                 rc = -ENOMEM;
539                 goto free_qdio_q_cache;
540         }
541
542         /* Check for OSA/FCP thin interrupts (bit 67). */
543         DBF_EVENT("thinint:%1d",
544                   (css_general_characteristics.aif_osa) ? 1 : 0);
545
546         /* Check for QEBSM support in general (bit 58). */
547         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
548         rc = 0;
549 out:
550         return rc;
551 free_qdio_q_cache:
552         kmem_cache_destroy(qdio_q_cache);
553         goto out;
554 }
555
556 void qdio_setup_exit(void)
557 {
558         kmem_cache_destroy(qdio_aob_cache);
559         kmem_cache_destroy(qdio_q_cache);
560 }