1 /*
2 * IEEE 1394 for Linux
3 *
4 * Copyright (C) 1999 Andreas E. Bombe
5 *
6 * This code is licensed under the GPL. See the file COPYING in the root
7 * directory of the kernel sources for details.
8 *
9 *
10 * Contributions:
11 *
12 * Christian Toegel <christian.toegel@gmx.at>
13 * unregister address space
14 *
15 * Manfred Weihs <weihs@ict.tuwien.ac.at>
16 * unregister address space
17 *
18 */
19
20 #include <linux/slab.h>
21 #include <linux/list.h>
22 #include <linux/bitops.h>
23
24 #include "ieee1394.h"
25 #include "ieee1394_types.h"
26 #include "hosts.h"
27 #include "ieee1394_core.h"
28 #include "highlevel.h"
29 #include "nodemgr.h"
30
31
32 struct hl_host_info {
33 struct list_head list;
34 struct hpsb_host *host;
35 size_t size;
36 unsigned long key;
37 void *data;
38 };
39
40
41 static LIST_HEAD(hl_drivers);
42 static DECLARE_RWSEM(hl_drivers_sem);
43
44 static LIST_HEAD(hl_irqs);
45 static DEFINE_RWLOCK(hl_irqs_lock);
46
47 static DEFINE_RWLOCK(addr_space_lock);
48
49 /* addr_space list will have zero and max already included as bounds */
50 static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
51 static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;
52
53
54 static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
55 struct hpsb_host *host)
56 {
57 struct hl_host_info *hi = NULL;
58
59 if (!hl || !host)
60 return NULL;
61
62 read_lock(&hl->host_info_lock);
63 list_for_each_entry(hi, &hl->host_info_list, list) {
64 if (hi->host == host) {
65 read_unlock(&hl->host_info_lock);
66 return hi;
67 }
68 }
69 read_unlock(&hl->host_info_lock);
70 return NULL;
71 }
72
73 /**
74 * hpsb_get_hostinfo - retrieve a hostinfo pointer bound to this driver/host
75 *
76 * Returns a per @host and @hl driver data structure that was previously stored
77 * by hpsb_create_hostinfo.
78 */
79 void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
80 {
81 struct hl_host_info *hi = hl_get_hostinfo(hl, host);
82
83 return hi ? hi->data : NULL;
84 }
85
86 /**
87 * hpsb_create_hostinfo - allocate a hostinfo pointer bound to this driver/host
88 *
89 * Allocate a hostinfo pointer backed by memory with @data_size and bind it to
90 * to this @hl driver and @host. If @data_size is zero, then the return here is
91 * only valid for error checking.
92 */
93 void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
94 size_t data_size)
95 {
96 struct hl_host_info *hi;
97 void *data;
98 unsigned long flags;
99
100 hi = hl_get_hostinfo(hl, host);
101 if (hi) {
102 HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already"
103 " exists", hl->name);
104 return NULL;
105 }
106
107 hi = kzalloc(sizeof(*hi) + data_size, GFP_ATOMIC);
108 if (!hi)
109 return NULL;
110
111 if (data_size) {
112 data = hi->data = hi + 1;
113 hi->size = data_size;
114 } else
115 data = hi;
116
117 hi->host = host;
118
119 write_lock_irqsave(&hl->host_info_lock, flags);
120 list_add_tail(&hi->list, &hl->host_info_list);
121 write_unlock_irqrestore(&hl->host_info_lock, flags);
122
123 return data;
124 }
125
126 /**
127 * hpsb_set_hostinfo - set the hostinfo pointer to something useful
128 *
129 * Usually follows a call to hpsb_create_hostinfo, where the size is 0.
130 */
131 int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
132 void *data)
133 {
134 struct hl_host_info *hi;
135
136 hi = hl_get_hostinfo(hl, host);
137 if (hi) {
138 if (!hi->size && !hi->data) {
139 hi->data = data;
140 return 0;
141 } else
142 HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo "
143 "already has data", hl->name);
144 } else
145 HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
146 hl->name);
147 return -EINVAL;
148 }
149
150 /**
151 * hpsb_destroy_hostinfo - free and remove a hostinfo pointer
152 *
153 * Free and remove the hostinfo pointer bound to this @hl driver and @host.
154 */
155 void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
156 {
157 struct hl_host_info *hi;
158
159 hi = hl_get_hostinfo(hl, host);
160 if (hi) {
161 unsigned long flags;
162 write_lock_irqsave(&hl->host_info_lock, flags);
163 list_del(&hi->list);
164 write_unlock_irqrestore(&hl->host_info_lock, flags);
165 kfree(hi);
166 }
167 return;
168 }
169
170 /**
171 * hpsb_set_hostinfo_key - set an alternate lookup key for an hostinfo
172 *
173 * Sets an alternate lookup key for the hostinfo bound to this @hl driver and
174 * @host.
175 */
176 void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host,
177 unsigned long key)
178 {
179 struct hl_host_info *hi;
180
181 hi = hl_get_hostinfo(hl, host);
182 if (hi)
183 hi->key = key;
184 return;
185 }
186
187 /**
188 * hpsb_get_hostinfo_bykey - retrieve a hostinfo pointer by its alternate key
189 */
190 void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
191 {
192 struct hl_host_info *hi;
193 void *data = NULL;
194
195 if (!hl)
196 return NULL;
197
198 read_lock(&hl->host_info_lock);
199 list_for_each_entry(hi, &hl->host_info_list, list) {
200 if (hi->key == key) {
201 data = hi->data;
202 break;
203 }
204 }
205 read_unlock(&hl->host_info_lock);
206 return data;
207 }
208
209 static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)
210 {
211 struct hpsb_highlevel *hl = __data;
212
213 hl->add_host(host);
214
215 if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
216 HPSB_ERR("Failed to generate Configuration ROM image for host "
217 "%s-%d", hl->name, host->id);
218 return 0;
219 }
220
221 /**
222 * hpsb_register_highlevel - register highlevel driver
223 *
224 * The name pointer in @hl has to stay valid at all times because the string is
225 * not copied.
226 */
227 void hpsb_register_highlevel(struct hpsb_highlevel *hl)
228 {
229 unsigned long flags;
230
231 INIT_LIST_HEAD(&hl->addr_list);
232 INIT_LIST_HEAD(&hl->host_info_list);
233
234 rwlock_init(&hl->host_info_lock);
235
236 down_write(&hl_drivers_sem);
237 list_add_tail(&hl->hl_list, &hl_drivers);
238 up_write(&hl_drivers_sem);
239
240 write_lock_irqsave(&hl_irqs_lock, flags);
241 list_add_tail(&hl->irq_list, &hl_irqs);
242 write_unlock_irqrestore(&hl_irqs_lock, flags);
243
244 if (hl->add_host)
245 nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
246 return;
247 }
248
249 static void __delete_addr(struct hpsb_address_serve *as)
250 {
251 list_del(&as->host_list);
252 list_del(&as->hl_list);
253 kfree(as);
254 }
255
256 static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,
257 int update_cr)
258 {
259 unsigned long flags;
260 struct list_head *lh, *next;
261 struct hpsb_address_serve *as;
262
263 /* First, let the highlevel driver unreg */
264 if (hl->remove_host)
265 hl->remove_host(host);
266
267 /* Remove any addresses that are matched for this highlevel driver
268 * and this particular host. */
269 write_lock_irqsave(&addr_space_lock, flags);
270 list_for_each_safe (lh, next, &hl->addr_list) {
271 as = list_entry(lh, struct hpsb_address_serve, hl_list);
272 if (as->host == host)
273 __delete_addr(as);
274 }
275 write_unlock_irqrestore(&addr_space_lock, flags);
276
277 /* Now update the config-rom to reflect anything removed by the
278 * highlevel driver. */
279 if (update_cr && host->update_config_rom &&
280 hpsb_update_config_rom_image(host) < 0)
281 HPSB_ERR("Failed to generate Configuration ROM image for host "
282 "%s-%d", hl->name, host->id);
283
284 /* Finally remove all the host info associated between these two. */
285 hpsb_destroy_hostinfo(hl, host);
286 }
287
288 static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
289 {
290 struct hpsb_highlevel *hl = __data;
291
292 __unregister_host(hl, host, 1);
293 return 0;
294 }
295
296 /**
297 * hpsb_unregister_highlevel - unregister highlevel driver
298 */
299 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
300 {
301 unsigned long flags;
302
303 write_lock_irqsave(&hl_irqs_lock, flags);
304 list_del(&hl->irq_list);
305 write_unlock_irqrestore(&hl_irqs_lock, flags);
306
307 down_write(&hl_drivers_sem);
308 list_del(&hl->hl_list);
309 up_write(&hl_drivers_sem);
310
311 nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
312 }
313
314 /**
315 * hpsb_allocate_and_register_addrspace - alloc' and reg' a host address space
316 *
317 * @start and @end are 48 bit pointers and have to be quadlet aligned.
318 * @end points to the first address behind the handled addresses. This
319 * function can be called multiple times for a single hpsb_highlevel @hl to
320 * implement sparse register sets. The requested region must not overlap any
321 * previously allocated region, otherwise registering will fail.
322 *
323 * It returns true for successful allocation. Address spaces can be
324 * unregistered with hpsb_unregister_addrspace. All remaining address spaces
325 * are automatically deallocated together with the hpsb_highlevel @hl.
326 */
327 u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
328 struct hpsb_host *host,
329 struct hpsb_address_ops *ops,
330 u64 size, u64 alignment,
331 u64 start, u64 end)
332 {
333 struct hpsb_address_serve *as, *a1, *a2;
334 struct list_head *entry;
335 u64 retval = CSR1212_INVALID_ADDR_SPACE;
336 unsigned long flags;
337 u64 align_mask = ~(alignment - 1);
338
339 if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
340 (hweight64(alignment) != 1)) {
341 HPSB_ERR("%s called with invalid alignment: 0x%048llx",
342 __FUNCTION__, (unsigned long long)alignment);
343 return retval;
344 }
345
346 /* default range,
347 * avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
348 if (start == CSR1212_INVALID_ADDR_SPACE &&
349 end == CSR1212_INVALID_ADDR_SPACE) {
350 start = host->middle_addr_space;
351 end = CSR1212_ALL_SPACE_END;
352 }
353
354 if (((start|end) & ~align_mask) || (start >= end) ||
355 (end > CSR1212_ALL_SPACE_END)) {
356 HPSB_ERR("%s called with invalid addresses "
357 "(start = %012Lx end = %012Lx)", __FUNCTION__,
358 (unsigned long long)start,(unsigned long long)end);
359 return retval;
360 }
361
362 as = kmalloc(sizeof(*as), GFP_KERNEL);
363 if (!as)
364 return retval;
365
366 INIT_LIST_HEAD(&as->host_list);
367 INIT_LIST_HEAD(&as->hl_list);
368 as->op = ops;
369 as->host = host;
370
371 write_lock_irqsave(&addr_space_lock, flags);
372 list_for_each(entry, &host->addr_space) {
373 u64 a1sa, a1ea;
374 u64 a2sa, a2ea;
375
376 a1 = list_entry(entry, struct hpsb_address_serve, host_list);
377 a2 = list_entry(entry->next, struct hpsb_address_serve,
378 host_list);
379
380 a1sa = a1->start & align_mask;
381 a1ea = (a1->end + alignment -1) & align_mask;
382 a2sa = a2->start & align_mask;
383 a2ea = (a2->end + alignment -1) & align_mask;
384
385 if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&
386 (a2sa > start)) {
387 as->start = max(start, a1ea);
388 as->end = as->start + size;
389 list_add(&as->host_list, entry);
390 list_add_tail(&as->hl_list, &hl->addr_list);
391 retval = as->start;
392 break;
393 }
394 }
395 write_unlock_irqrestore(&addr_space_lock, flags);
396
397 if (retval == CSR1212_INVALID_ADDR_SPACE)
398 kfree(as);
399 return retval;
400 }
401
402 /**
403 * hpsb_register_addrspace - register a host address space
404 *
405 * @start and @end are 48 bit pointers and have to be quadlet aligned.
406 * @end points to the first address behind the handled addresses. This
407 * function can be called multiple times for a single hpsb_highlevel @hl to
408 * implement sparse register sets. The requested region must not overlap any
409 * previously allocated region, otherwise registering will fail.
410 *
411 * It returns true for successful allocation. Address spaces can be
412 * unregistered with hpsb_unregister_addrspace. All remaining address spaces
413 * are automatically deallocated together with the hpsb_highlevel @hl.
414 */
415 int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
416 struct hpsb_address_ops *ops, u64 start, u64 end)
417 {
418 struct hpsb_address_serve *as;
419 struct list_head *lh;
420 int retval = 0;
421 unsigned long flags;
422
423 if (((start|end) & 3) || (start >= end) ||
424 (end > CSR1212_ALL_SPACE_END)) {
425 HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
426 return 0;
427 }
428
429 as = kmalloc(sizeof(*as), GFP_ATOMIC);
430 if (!as)
431 return 0;
432
433 INIT_LIST_HEAD(&as->host_list);
434 INIT_LIST_HEAD(&as->hl_list);
435 as->op = ops;
436 as->start = start;
437 as->end = end;
438 as->host = host;
439
440 write_lock_irqsave(&addr_space_lock, flags);
441 list_for_each(lh, &host->addr_space) {
442 struct hpsb_address_serve *as_this =
443 list_entry(lh, struct hpsb_address_serve, host_list);
444 struct hpsb_address_serve *as_next =
445 list_entry(lh->next, struct hpsb_address_serve,
446 host_list);
447
448 if (as_this->end > as->start)
449 break;
450
451 if (as_next->start >= as->end) {
452 list_add(&as->host_list, lh);
453 list_add_tail(&as->hl_list, &hl->addr_list);
454 retval = 1;
455 break;
456 }
457 }
458 write_unlock_irqrestore(&addr_space_lock, flags);
459
460 if (retval == 0)
461 kfree(as);
462 return retval;
463 }
464
465 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
466 u64 start)
467 {
468 int retval = 0;
469 struct hpsb_address_serve *as;
470 struct list_head *lh, *next;
471 unsigned long flags;
472
473 write_lock_irqsave(&addr_space_lock, flags);
474 list_for_each_safe (lh, next, &hl->addr_list) {
475 as = list_entry(lh, struct hpsb_address_serve, hl_list);
476 if (as->start == start && as->host == host) {
477 __delete_addr(as);
478 retval = 1;
479 break;
480 }
481 }
482 write_unlock_irqrestore(&addr_space_lock, flags);
483 return retval;
484 }
485
486 static void init_hpsb_highlevel(struct hpsb_host *host)
487 {
488 INIT_LIST_HEAD(&dummy_zero_addr.host_list);
489 INIT_LIST_HEAD(&dummy_zero_addr.hl_list);
490 INIT_LIST_HEAD(&dummy_max_addr.host_list);
491 INIT_LIST_HEAD(&dummy_max_addr.hl_list);
492
493 dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
494
495 dummy_zero_addr.start = dummy_zero_addr.end = 0;
496 dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
497
498 list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);
499 list_add_tail(&dummy_max_addr.host_list, &host->addr_space);
500 }
501
502 void highlevel_add_host(struct hpsb_host *host)
503 {
504 struct hpsb_highlevel *hl;
505
506 init_hpsb_highlevel(host);
507
508 down_read(&hl_drivers_sem);
509 list_for_each_entry(hl, &hl_drivers, hl_list) {
510 if (hl->add_host)
511 hl->add_host(host);
512 }
513 up_read(&hl_drivers_sem);
514 if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
515 HPSB_ERR("Failed to generate Configuration ROM image for host "
516 "%s-%d", hl->name, host->id);
517 }
518
519 void highlevel_remove_host(struct hpsb_host *host)
520 {
521 struct hpsb_highlevel *hl;
522
523 down_read(&hl_drivers_sem);
524 list_for_each_entry(hl, &hl_drivers, hl_list)
525 __unregister_host(hl, host, 0);
526 up_read(&hl_drivers_sem);
527 }
528
529 void highlevel_host_reset(struct hpsb_host *host)
530 {
531 unsigned long flags;
532 struct hpsb_highlevel *hl;
533
534 read_lock_irqsave(&hl_irqs_lock, flags);
535 list_for_each_entry(hl, &hl_irqs, irq_list) {
536 if (hl->host_reset)
537 hl->host_reset(host);
538 }
539 read_unlock_irqrestore(&hl_irqs_lock, flags);
540 }
541
542 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
543 void *data, size_t length)
544 {
545 unsigned long flags;
546 struct hpsb_highlevel *hl;
547 int cts = ((quadlet_t *)data)[0] >> 4;
548
549 read_lock_irqsave(&hl_irqs_lock, flags);
550 list_for_each_entry(hl, &hl_irqs, irq_list) {
551 if (hl->fcp_request)
552 hl->fcp_request(host, nodeid, direction, cts, data,
553 length);
554 }
555 read_unlock_irqrestore(&hl_irqs_lock, flags);
556 }
557
558 /*
559 * highlevel_read, highlevel_write, highlevel_lock, highlevel_lock64:
560 *
561 * These functions are called to handle transactions. They are called when a
562 * packet arrives. The flags argument contains the second word of the first
563 * header quadlet of the incoming packet (containing transaction label, retry
564 * code, transaction code and priority). These functions either return a
565 * response code or a negative number. In the first case a response will be
566 * generated. In the latter case, no response will be sent and the driver which
567 * handled the request will send the response itself.
568 */
569 int highlevel_read(struct hpsb_host *host, int nodeid, void *data, u64 addr,
570 unsigned int length, u16 flags)
571 {
572 struct hpsb_address_serve *as;
573 unsigned int partlength;
574 int rcode = RCODE_ADDRESS_ERROR;
575
576 read_lock(&addr_space_lock);
577 list_for_each_entry(as, &host->addr_space, host_list) {
578 if (as->start > addr)
579 break;
580
581 if (as->end > addr) {
582 partlength = min(as->end - addr, (u64) length);
583
584 if (as->op->read)
585 rcode = as->op->read(host, nodeid, data,
586 addr, partlength, flags);
587 else
588 rcode = RCODE_TYPE_ERROR;
589
590 data += partlength;
591 length -= partlength;
592 addr += partlength;
593
594 if ((rcode != RCODE_COMPLETE) || !length)
595 break;
596 }
597 }
598 read_unlock(&addr_space_lock);
599
600 if (length && (rcode == RCODE_COMPLETE))
601 rcode = RCODE_ADDRESS_ERROR;
602 return rcode;
603 }
604
605 int highlevel_write(struct hpsb_host *host, int nodeid, int destid, void *data,
606 u64 addr, unsigned int length, u16 flags)
607 {
608 struct hpsb_address_serve *as;
609 unsigned int partlength;
610 int rcode = RCODE_ADDRESS_ERROR;
611
612 read_lock(&addr_space_lock);
613 list_for_each_entry(as, &host->addr_space, host_list) {
614 if (as->start > addr)
615 break;
616
617 if (as->end > addr) {
618 partlength = min(as->end - addr, (u64) length);
619
620 if (as->op->write)
621 rcode = as->op->write(host, nodeid, destid,
622 data, addr, partlength,
623 flags);
624 else
625 rcode = RCODE_TYPE_ERROR;
626
627 data += partlength;
628 length -= partlength;
629 addr += partlength;
630
631 if ((rcode != RCODE_COMPLETE) || !length)
632 break;
633 }
634 }
635 read_unlock(&addr_space_lock);
636
637 if (length && (rcode == RCODE_COMPLETE))
638 rcode = RCODE_ADDRESS_ERROR;
639 return rcode;
640 }
641
642 int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
643 u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode,
644 u16 flags)
645 {
646 struct hpsb_address_serve *as;
647 int rcode = RCODE_ADDRESS_ERROR;
648
649 read_lock(&addr_space_lock);
650 list_for_each_entry(as, &host->addr_space, host_list) {
651 if (as->start > addr)
652 break;
653
654 if (as->end > addr) {
655 if (as->op->lock)
656 rcode = as->op->lock(host, nodeid, store, addr,
657 data, arg, ext_tcode,
658 flags);
659 else
660 rcode = RCODE_TYPE_ERROR;
661 break;
662 }
663 }
664 read_unlock(&addr_space_lock);
665 return rcode;
666 }
667
668 int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
669 u64 addr, octlet_t data, octlet_t arg, int ext_tcode,
670 u16 flags)
671 {
672 struct hpsb_address_serve *as;
673 int rcode = RCODE_ADDRESS_ERROR;
674
675 read_lock(&addr_space_lock);
676
677 list_for_each_entry(as, &host->addr_space, host_list) {
678 if (as->start > addr)
679 break;
680
681 if (as->end > addr) {
682 if (as->op->lock64)
683 rcode = as->op->lock64(host, nodeid, store,
684 addr, data, arg,
685 ext_tcode, flags);
686 else
687 rcode = RCODE_TYPE_ERROR;
688 break;
689 }
690 }
691 read_unlock(&addr_space_lock);
692 return rcode;
693 }
694
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