a13cf7ec64b2b0e0ab558694e4d77e8487a9ab36
[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
23 /*
24  * qebsm is only available under 64bit but the adapter sets the feature
25  * flag anyway, so we manually override it.
26  */
27 static inline int qebsm_possible(void)
28 {
29 #ifdef CONFIG_64BIT
30         return css_general_characteristics.qebsm;
31 #endif
32         return 0;
33 }
34
35 /*
36  * qib_param_field: pointer to 128 bytes or NULL, if no param field
37  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
38  */
39 static void set_impl_params(struct qdio_irq *irq_ptr,
40                             unsigned int qib_param_field_format,
41                             unsigned char *qib_param_field,
42                             unsigned long *input_slib_elements,
43                             unsigned long *output_slib_elements)
44 {
45         struct qdio_q *q;
46         int i, j;
47
48         if (!irq_ptr)
49                 return;
50
51         irq_ptr->qib.pfmt = qib_param_field_format;
52         if (qib_param_field)
53                 memcpy(irq_ptr->qib.parm, qib_param_field,
54                        QDIO_MAX_BUFFERS_PER_Q);
55
56         if (!input_slib_elements)
57                 goto output;
58
59         for_each_input_queue(irq_ptr, q, i) {
60                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
61                         q->slib->slibe[j].parms =
62                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
63         }
64 output:
65         if (!output_slib_elements)
66                 return;
67
68         for_each_output_queue(irq_ptr, q, i) {
69                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
70                         q->slib->slibe[j].parms =
71                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
72         }
73 }
74
75 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
76 {
77         struct qdio_q *q;
78         int i;
79
80         for (i = 0; i < nr_queues; i++) {
81                 q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
82                 if (!q)
83                         return -ENOMEM;
84
85                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
86                 if (!q->slib) {
87                         kmem_cache_free(qdio_q_cache, q);
88                         return -ENOMEM;
89                 }
90                 irq_ptr_qs[i] = q;
91         }
92         return 0;
93 }
94
95 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
96 {
97         int rc;
98
99         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
100         if (rc)
101                 return rc;
102         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
103         return rc;
104 }
105
106 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
107                               qdio_handler_t *handler, int i)
108 {
109         struct slib *slib = q->slib;
110
111         /* queue must be cleared for qdio_establish */
112         memset(q, 0, sizeof(*q));
113         memset(slib, 0, PAGE_SIZE);
114         q->slib = slib;
115         q->irq_ptr = irq_ptr;
116         q->mask = 1 << (31 - i);
117         q->nr = i;
118         q->handler = handler;
119 }
120
121 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
122                                 void **sbals_array, int i)
123 {
124         struct qdio_q *prev;
125         int j;
126
127         DBF_HEX(&q, sizeof(void *));
128         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
129
130         /* fill in sbal */
131         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
132                 q->sbal[j] = *sbals_array++;
133                 BUG_ON((unsigned long)q->sbal[j] & 0xff);
134         }
135
136         /* fill in slib */
137         if (i > 0) {
138                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
139                         : irq_ptr->output_qs[i - 1];
140                 prev->slib->nsliba = (unsigned long)q->slib;
141         }
142
143         q->slib->sla = (unsigned long)q->sl;
144         q->slib->slsba = (unsigned long)&q->slsb.val[0];
145
146         /* fill in sl */
147         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
148                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
149 }
150
151 static void setup_queues(struct qdio_irq *irq_ptr,
152                          struct qdio_initialize *qdio_init)
153 {
154         struct qdio_q *q;
155         void **input_sbal_array = qdio_init->input_sbal_addr_array;
156         void **output_sbal_array = qdio_init->output_sbal_addr_array;
157         int i;
158
159         for_each_input_queue(irq_ptr, q, i) {
160                 DBF_EVENT("in-q:%1d", i);
161                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
162
163                 q->is_input_q = 1;
164                 q->u.in.queue_start_poll = qdio_init->queue_start_poll;
165                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
166                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
167
168                 if (is_thinint_irq(irq_ptr))
169                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
170                                      (unsigned long) q);
171                 else
172                         tasklet_init(&q->tasklet, qdio_inbound_processing,
173                                      (unsigned long) q);
174         }
175
176         for_each_output_queue(irq_ptr, q, i) {
177                 DBF_EVENT("outq:%1d", i);
178                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
179
180                 q->is_input_q = 0;
181                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
182                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
183
184                 tasklet_init(&q->tasklet, qdio_outbound_processing,
185                              (unsigned long) q);
186                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
187                             &qdio_outbound_timer, (unsigned long)q);
188         }
189 }
190
191 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
192 {
193         if (qdioac & AC1_SIGA_INPUT_NEEDED)
194                 irq_ptr->siga_flag.input = 1;
195         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
196                 irq_ptr->siga_flag.output = 1;
197         if (qdioac & AC1_SIGA_SYNC_NEEDED)
198                 irq_ptr->siga_flag.sync = 1;
199         if (qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)
200                 irq_ptr->siga_flag.no_sync_ti = 1;
201         if (qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)
202                 irq_ptr->siga_flag.no_sync_out_pci = 1;
203
204         if (irq_ptr->siga_flag.no_sync_out_pci &&
205             irq_ptr->siga_flag.no_sync_ti)
206                 irq_ptr->siga_flag.no_sync_out_ti = 1;
207 }
208
209 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
210                                   unsigned char qdioac, unsigned long token)
211 {
212         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
213                 goto no_qebsm;
214         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
215             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
216                 goto no_qebsm;
217
218         irq_ptr->sch_token = token;
219
220         DBF_EVENT("V=V:1");
221         DBF_EVENT("%8lx", irq_ptr->sch_token);
222         return;
223
224 no_qebsm:
225         irq_ptr->sch_token = 0;
226         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
227         DBF_EVENT("noV=V");
228 }
229
230 /*
231  * If there is a qdio_irq we use the chsc_page and store the information
232  * in the qdio_irq, otherwise we copy it to the specified structure.
233  */
234 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
235                         struct subchannel_id *schid,
236                         struct qdio_ssqd_desc *data)
237 {
238         struct chsc_ssqd_area *ssqd;
239         int rc;
240
241         DBF_EVENT("getssqd:%4x", schid->sch_no);
242         if (irq_ptr != NULL)
243                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
244         else
245                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
246         memset(ssqd, 0, PAGE_SIZE);
247
248         ssqd->request = (struct chsc_header) {
249                 .length = 0x0010,
250                 .code   = 0x0024,
251         };
252         ssqd->first_sch = schid->sch_no;
253         ssqd->last_sch = schid->sch_no;
254         ssqd->ssid = schid->ssid;
255
256         if (chsc(ssqd))
257                 return -EIO;
258         rc = chsc_error_from_response(ssqd->response.code);
259         if (rc)
260                 return rc;
261
262         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
263             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
264             (ssqd->qdio_ssqd.sch != schid->sch_no))
265                 return -EINVAL;
266
267         if (irq_ptr != NULL)
268                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
269                        sizeof(struct qdio_ssqd_desc));
270         else {
271                 memcpy(data, &ssqd->qdio_ssqd,
272                        sizeof(struct qdio_ssqd_desc));
273                 free_page((unsigned long)ssqd);
274         }
275         return 0;
276 }
277
278 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
279 {
280         unsigned char qdioac;
281         int rc;
282
283         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
284         if (rc) {
285                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
286                 DBF_ERROR("rc:%x", rc);
287                 /* all flags set, worst case */
288                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
289                          AC1_SIGA_SYNC_NEEDED;
290         } else
291                 qdioac = irq_ptr->ssqd_desc.qdioac1;
292
293         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
294         process_ac_flags(irq_ptr, qdioac);
295         DBF_EVENT("qdioac:%4x", qdioac);
296 }
297
298 void qdio_release_memory(struct qdio_irq *irq_ptr)
299 {
300         struct qdio_q *q;
301         int i;
302
303         /*
304          * Must check queue array manually since irq_ptr->nr_input_queues /
305          * irq_ptr->nr_input_queues may not yet be set.
306          */
307         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
308                 q = irq_ptr->input_qs[i];
309                 if (q) {
310                         free_page((unsigned long) q->slib);
311                         kmem_cache_free(qdio_q_cache, q);
312                 }
313         }
314         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
315                 q = irq_ptr->output_qs[i];
316                 if (q) {
317                         free_page((unsigned long) q->slib);
318                         kmem_cache_free(qdio_q_cache, q);
319                 }
320         }
321         free_page((unsigned long) irq_ptr->qdr);
322         free_page(irq_ptr->chsc_page);
323         free_page((unsigned long) irq_ptr);
324 }
325
326 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
327                                      struct qdio_q **irq_ptr_qs,
328                                      int i, int nr)
329 {
330         irq_ptr->qdr->qdf0[i + nr].sliba =
331                 (unsigned long)irq_ptr_qs[i]->slib;
332
333         irq_ptr->qdr->qdf0[i + nr].sla =
334                 (unsigned long)irq_ptr_qs[i]->sl;
335
336         irq_ptr->qdr->qdf0[i + nr].slsba =
337                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
338
339         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
340         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
341         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
342         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
343 }
344
345 static void setup_qdr(struct qdio_irq *irq_ptr,
346                       struct qdio_initialize *qdio_init)
347 {
348         int i;
349
350         irq_ptr->qdr->qfmt = qdio_init->q_format;
351         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
352         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
353         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
354         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
355         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
356         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
357
358         for (i = 0; i < qdio_init->no_input_qs; i++)
359                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
360
361         for (i = 0; i < qdio_init->no_output_qs; i++)
362                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
363                                          qdio_init->no_input_qs);
364 }
365
366 static void setup_qib(struct qdio_irq *irq_ptr,
367                       struct qdio_initialize *init_data)
368 {
369         if (qebsm_possible())
370                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
371
372         irq_ptr->qib.rflags |= init_data->qib_rflags;
373
374         irq_ptr->qib.qfmt = init_data->q_format;
375         if (init_data->no_input_qs)
376                 irq_ptr->qib.isliba =
377                         (unsigned long)(irq_ptr->input_qs[0]->slib);
378         if (init_data->no_output_qs)
379                 irq_ptr->qib.osliba =
380                         (unsigned long)(irq_ptr->output_qs[0]->slib);
381         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
382 }
383
384 int qdio_setup_irq(struct qdio_initialize *init_data)
385 {
386         struct ciw *ciw;
387         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
388         int rc;
389
390         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
391         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
392         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
393         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
394         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
395
396         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
397         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
398
399         /* wipes qib.ac, required by ar7063 */
400         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
401
402         irq_ptr->int_parm = init_data->int_parm;
403         irq_ptr->nr_input_qs = init_data->no_input_qs;
404         irq_ptr->nr_output_qs = init_data->no_output_qs;
405
406         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
407         irq_ptr->cdev = init_data->cdev;
408         setup_queues(irq_ptr, init_data);
409
410         setup_qib(irq_ptr, init_data);
411         qdio_setup_thinint(irq_ptr);
412         set_impl_params(irq_ptr, init_data->qib_param_field_format,
413                         init_data->qib_param_field,
414                         init_data->input_slib_elements,
415                         init_data->output_slib_elements);
416
417         /* fill input and output descriptors */
418         setup_qdr(irq_ptr, init_data);
419
420         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
421
422         /* get qdio commands */
423         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
424         if (!ciw) {
425                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
426                 rc = -EINVAL;
427                 goto out_err;
428         }
429         irq_ptr->equeue = *ciw;
430
431         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
432         if (!ciw) {
433                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
434                 rc = -EINVAL;
435                 goto out_err;
436         }
437         irq_ptr->aqueue = *ciw;
438
439         /* set new interrupt handler */
440         irq_ptr->orig_handler = init_data->cdev->handler;
441         init_data->cdev->handler = qdio_int_handler;
442         return 0;
443 out_err:
444         qdio_release_memory(irq_ptr);
445         return rc;
446 }
447
448 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
449                                 struct ccw_device *cdev)
450 {
451         char s[80];
452
453         snprintf(s, 80, "qdio: %s %s on SC %x using "
454                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s%s\n",
455                  dev_name(&cdev->dev),
456                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
457                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
458                  irq_ptr->schid.sch_no,
459                  is_thinint_irq(irq_ptr),
460                  (irq_ptr->sch_token) ? 1 : 0,
461                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
462                  css_general_characteristics.aif_tdd,
463                  (irq_ptr->siga_flag.input) ? "R" : " ",
464                  (irq_ptr->siga_flag.output) ? "W" : " ",
465                  (irq_ptr->siga_flag.sync) ? "S" : " ",
466                  (!irq_ptr->siga_flag.no_sync_ti) ? "A" : " ",
467                  (!irq_ptr->siga_flag.no_sync_out_ti) ? "O" : " ",
468                  (!irq_ptr->siga_flag.no_sync_out_pci) ? "P" : " ");
469         printk(KERN_INFO "%s", s);
470 }
471
472 int __init qdio_setup_init(void)
473 {
474         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
475                                          256, 0, NULL);
476         if (!qdio_q_cache)
477                 return -ENOMEM;
478
479         /* Check for OSA/FCP thin interrupts (bit 67). */
480         DBF_EVENT("thinint:%1d",
481                   (css_general_characteristics.aif_osa) ? 1 : 0);
482
483         /* Check for QEBSM support in general (bit 58). */
484         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
485         return 0;
486 }
487
488 void qdio_setup_exit(void)
489 {
490         kmem_cache_destroy(qdio_q_cache);
491 }