?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
fix race condition in cor_announce_send_stop
[cor.git] / drivers / firewire / core-cdev.c
blob6e291d8f3a278556c8d0349b7aed9c8d9e67db9c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Char device for device raw access
4 *
5 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
6 */
7
8 #include <linux/bug.h>
9 #include <linux/compat.h>
10 #include <linux/delay.h>
11 #include <linux/device.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/errno.h>
14 #include <linux/firewire.h>
15 #include <linux/firewire-cdev.h>
16 #include <linux/idr.h>
17 #include <linux/irqflags.h>
18 #include <linux/jiffies.h>
19 #include <linux/kernel.h>
20 #include <linux/kref.h>
21 #include <linux/mm.h>
22 #include <linux/module.h>
23 #include <linux/mutex.h>
24 #include <linux/poll.h>
25 #include <linux/sched.h> /* required for linux/wait.h */
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/string.h>
29 #include <linux/time.h>
30 #include <linux/uaccess.h>
31 #include <linux/vmalloc.h>
32 #include <linux/wait.h>
33 #include <linux/workqueue.h>
34
35
36 #include "core.h"
37
38 /*
39 * ABI version history is documented in linux/firewire-cdev.h.
40 */
41 #define FW_CDEV_KERNEL_VERSION 5
42 #define FW_CDEV_VERSION_EVENT_REQUEST2 4
43 #define FW_CDEV_VERSION_ALLOCATE_REGION_END 4
44 #define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5
45
46 struct client {
47 u32 version;
48 struct fw_device *device;
49
50 spinlock_t lock;
51 bool in_shutdown;
52 struct idr resource_idr;
53 struct list_head event_list;
54 wait_queue_head_t wait;
55 wait_queue_head_t tx_flush_wait;
56 u64 bus_reset_closure;
57
58 struct fw_iso_context *iso_context;
59 u64 iso_closure;
60 struct fw_iso_buffer buffer;
61 unsigned long vm_start;
62 bool buffer_is_mapped;
63
64 struct list_head phy_receiver_link;
65 u64 phy_receiver_closure;
66
67 struct list_head link;
68 struct kref kref;
69 };
70
71 static inline void client_get(struct client *client)
72 {
73 kref_get(&client->kref);
74 }
75
76 static void client_release(struct kref *kref)
77 {
78 struct client *client = container_of(kref, struct client, kref);
79
80 fw_device_put(client->device);
81 kfree(client);
82 }
83
84 static void client_put(struct client *client)
85 {
86 kref_put(&client->kref, client_release);
87 }
88
89 struct client_resource;
90 typedef void (*client_resource_release_fn_t)(struct client *,
91 struct client_resource *);
92 struct client_resource {
93 client_resource_release_fn_t release;
94 int handle;
95 };
96
97 struct address_handler_resource {
98 struct client_resource resource;
99 struct fw_address_handler handler;
100 __u64 closure;
101 struct client *client;
102 };
103
104 struct outbound_transaction_resource {
105 struct client_resource resource;
106 struct fw_transaction transaction;
107 };
108
109 struct inbound_transaction_resource {
110 struct client_resource resource;
111 struct fw_card *card;
112 struct fw_request *request;
113 void *data;
114 size_t length;
115 };
116
117 struct descriptor_resource {
118 struct client_resource resource;
119 struct fw_descriptor descriptor;
120 u32 data[0];
121 };
122
123 struct iso_resource {
124 struct client_resource resource;
125 struct client *client;
126 /* Schedule work and access todo only with client->lock held. */
127 struct delayed_work work;
128 enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
129 ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
130 int generation;
131 u64 channels;
132 s32 bandwidth;
133 struct iso_resource_event *e_alloc, *e_dealloc;
134 };
135
136 static void release_iso_resource(struct client *, struct client_resource *);
137
138 static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
139 {
140 client_get(r->client);
141 if (!queue_delayed_work(fw_workqueue, &r->work, delay))
142 client_put(r->client);
143 }
144
145 static void schedule_if_iso_resource(struct client_resource *resource)
146 {
147 if (resource->release == release_iso_resource)
148 schedule_iso_resource(container_of(resource,
149 struct iso_resource, resource), 0);
150 }
151
152 /*
153 * dequeue_event() just kfree()'s the event, so the event has to be
154 * the first field in a struct XYZ_event.
155 */
156 struct event {
157 struct { void *data; size_t size; } v[2];
158 struct list_head link;
159 };
160
161 struct bus_reset_event {
162 struct event event;
163 struct fw_cdev_event_bus_reset reset;
164 };
165
166 struct outbound_transaction_event {
167 struct event event;
168 struct client *client;
169 struct outbound_transaction_resource r;
170 struct fw_cdev_event_response response;
171 };
172
173 struct inbound_transaction_event {
174 struct event event;
175 union {
176 struct fw_cdev_event_request request;
177 struct fw_cdev_event_request2 request2;
178 } req;
179 };
180
181 struct iso_interrupt_event {
182 struct event event;
183 struct fw_cdev_event_iso_interrupt interrupt;
184 };
185
186 struct iso_interrupt_mc_event {
187 struct event event;
188 struct fw_cdev_event_iso_interrupt_mc interrupt;
189 };
190
191 struct iso_resource_event {
192 struct event event;
193 struct fw_cdev_event_iso_resource iso_resource;
194 };
195
196 struct outbound_phy_packet_event {
197 struct event event;
198 struct client *client;
199 struct fw_packet p;
200 struct fw_cdev_event_phy_packet phy_packet;
201 };
202
203 struct inbound_phy_packet_event {
204 struct event event;
205 struct fw_cdev_event_phy_packet phy_packet;
206 };
207
208 #ifdef CONFIG_COMPAT
209 static void __user *u64_to_uptr(u64 value)
210 {
211 if (in_compat_syscall())
212 return compat_ptr(value);
213 else
214 return (void __user *)(unsigned long)value;
215 }
216
217 static u64 uptr_to_u64(void __user *ptr)
218 {
219 if (in_compat_syscall())
220 return ptr_to_compat(ptr);
221 else
222 return (u64)(unsigned long)ptr;
223 }
224 #else
225 static inline void __user *u64_to_uptr(u64 value)
226 {
227 return (void __user *)(unsigned long)value;
228 }
229
230 static inline u64 uptr_to_u64(void __user *ptr)
231 {
232 return (u64)(unsigned long)ptr;
233 }
234 #endif /* CONFIG_COMPAT */
235
236 static int fw_device_op_open(struct inode *inode, struct file *file)
237 {
238 struct fw_device *device;
239 struct client *client;
240
241 device = fw_device_get_by_devt(inode->i_rdev);
242 if (device == NULL)
243 return -ENODEV;
244
245 if (fw_device_is_shutdown(device)) {
246 fw_device_put(device);
247 return -ENODEV;
248 }
249
250 client = kzalloc(sizeof(*client), GFP_KERNEL);
251 if (client == NULL) {
252 fw_device_put(device);
253 return -ENOMEM;
254 }
255
256 client->device = device;
257 spin_lock_init(&client->lock);
258 idr_init(&client->resource_idr);
259 INIT_LIST_HEAD(&client->event_list);
260 init_waitqueue_head(&client->wait);
261 init_waitqueue_head(&client->tx_flush_wait);
262 INIT_LIST_HEAD(&client->phy_receiver_link);
263 INIT_LIST_HEAD(&client->link);
264 kref_init(&client->kref);
265
266 file->private_data = client;
267
268 return nonseekable_open(inode, file);
269 }
270
271 static void queue_event(struct client *client, struct event *event,
272 void *data0, size_t size0, void *data1, size_t size1)
273 {
274 unsigned long flags;
275
276 event->v[0].data = data0;
277 event->v[0].size = size0;
278 event->v[1].data = data1;
279 event->v[1].size = size1;
280
281 spin_lock_irqsave(&client->lock, flags);
282 if (client->in_shutdown)
283 kfree(event);
284 else
285 list_add_tail(&event->link, &client->event_list);
286 spin_unlock_irqrestore(&client->lock, flags);
287
288 wake_up_interruptible(&client->wait);
289 }
290
291 static int dequeue_event(struct client *client,
292 char __user *buffer, size_t count)
293 {
294 struct event *event;
295 size_t size, total;
296 int i, ret;
297
298 ret = wait_event_interruptible(client->wait,
299 !list_empty(&client->event_list) ||
300 fw_device_is_shutdown(client->device));
301 if (ret < 0)
302 return ret;
303
304 if (list_empty(&client->event_list) &&
305 fw_device_is_shutdown(client->device))
306 return -ENODEV;
307
308 spin_lock_irq(&client->lock);
309 event = list_first_entry(&client->event_list, struct event, link);
310 list_del(&event->link);
311 spin_unlock_irq(&client->lock);
312
313 total = 0;
314 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
315 size = min(event->v[i].size, count - total);
316 if (copy_to_user(buffer + total, event->v[i].data, size)) {
317 ret = -EFAULT;
318 goto out;
319 }
320 total += size;
321 }
322 ret = total;
323
324 out:
325 kfree(event);
326
327 return ret;
328 }
329
330 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
331 size_t count, loff_t *offset)
332 {
333 struct client *client = file->private_data;
334
335 return dequeue_event(client, buffer, count);
336 }
337
338 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
339 struct client *client)
340 {
341 struct fw_card *card = client->device->card;
342
343 spin_lock_irq(&card->lock);
344
345 event->closure = client->bus_reset_closure;
346 event->type = FW_CDEV_EVENT_BUS_RESET;
347 event->generation = client->device->generation;
348 event->node_id = client->device->node_id;
349 event->local_node_id = card->local_node->node_id;
350 event->bm_node_id = card->bm_node_id;
351 event->irm_node_id = card->irm_node->node_id;
352 event->root_node_id = card->root_node->node_id;
353
354 spin_unlock_irq(&card->lock);
355 }
356
357 static void for_each_client(struct fw_device *device,
358 void (*callback)(struct client *client))
359 {
360 struct client *c;
361
362 mutex_lock(&device->client_list_mutex);
363 list_for_each_entry(c, &device->client_list, link)
364 callback(c);
365 mutex_unlock(&device->client_list_mutex);
366 }
367
368 static int schedule_reallocations(int id, void *p, void *data)
369 {
370 schedule_if_iso_resource(p);
371
372 return 0;
373 }
374
375 static void queue_bus_reset_event(struct client *client)
376 {
377 struct bus_reset_event *e;
378
379 e = kzalloc(sizeof(*e), GFP_KERNEL);
380 if (e == NULL)
381 return;
382
383 fill_bus_reset_event(&e->reset, client);
384
385 queue_event(client, &e->event,
386 &e->reset, sizeof(e->reset), NULL, 0);
387
388 spin_lock_irq(&client->lock);
389 idr_for_each(&client->resource_idr, schedule_reallocations, client);
390 spin_unlock_irq(&client->lock);
391 }
392
393 void fw_device_cdev_update(struct fw_device *device)
394 {
395 for_each_client(device, queue_bus_reset_event);
396 }
397
398 static void wake_up_client(struct client *client)
399 {
400 wake_up_interruptible(&client->wait);
401 }
402
403 void fw_device_cdev_remove(struct fw_device *device)
404 {
405 for_each_client(device, wake_up_client);
406 }
407
408 union ioctl_arg {
409 struct fw_cdev_get_info get_info;
410 struct fw_cdev_send_request send_request;
411 struct fw_cdev_allocate allocate;
412 struct fw_cdev_deallocate deallocate;
413 struct fw_cdev_send_response send_response;
414 struct fw_cdev_initiate_bus_reset initiate_bus_reset;
415 struct fw_cdev_add_descriptor add_descriptor;
416 struct fw_cdev_remove_descriptor remove_descriptor;
417 struct fw_cdev_create_iso_context create_iso_context;
418 struct fw_cdev_queue_iso queue_iso;
419 struct fw_cdev_start_iso start_iso;
420 struct fw_cdev_stop_iso stop_iso;
421 struct fw_cdev_get_cycle_timer get_cycle_timer;
422 struct fw_cdev_allocate_iso_resource allocate_iso_resource;
423 struct fw_cdev_send_stream_packet send_stream_packet;
424 struct fw_cdev_get_cycle_timer2 get_cycle_timer2;
425 struct fw_cdev_send_phy_packet send_phy_packet;
426 struct fw_cdev_receive_phy_packets receive_phy_packets;
427 struct fw_cdev_set_iso_channels set_iso_channels;
428 struct fw_cdev_flush_iso flush_iso;
429 };
430
431 static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
432 {
433 struct fw_cdev_get_info *a = &arg->get_info;
434 struct fw_cdev_event_bus_reset bus_reset;
435 unsigned long ret = 0;
436
437 client->version = a->version;
438 a->version = FW_CDEV_KERNEL_VERSION;
439 a->card = client->device->card->index;
440
441 down_read(&fw_device_rwsem);
442
443 if (a->rom != 0) {
444 size_t want = a->rom_length;
445 size_t have = client->device->config_rom_length * 4;
446
447 ret = copy_to_user(u64_to_uptr(a->rom),
448 client->device->config_rom, min(want, have));
449 }
450 a->rom_length = client->device->config_rom_length * 4;
451
452 up_read(&fw_device_rwsem);
453
454 if (ret != 0)
455 return -EFAULT;
456
457 mutex_lock(&client->device->client_list_mutex);
458
459 client->bus_reset_closure = a->bus_reset_closure;
460 if (a->bus_reset != 0) {
461 fill_bus_reset_event(&bus_reset, client);
462 /* unaligned size of bus_reset is 36 bytes */
463 ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36);
464 }
465 if (ret == 0 && list_empty(&client->link))
466 list_add_tail(&client->link, &client->device->client_list);
467
468 mutex_unlock(&client->device->client_list_mutex);
469
470 return ret ? -EFAULT : 0;
471 }
472
473 static int add_client_resource(struct client *client,
474 struct client_resource *resource, gfp_t gfp_mask)
475 {
476 bool preload = gfpflags_allow_blocking(gfp_mask);
477 unsigned long flags;
478 int ret;
479
480 if (preload)
481 idr_preload(gfp_mask);
482 spin_lock_irqsave(&client->lock, flags);
483
484 if (client->in_shutdown)
485 ret = -ECANCELED;
486 else
487 ret = idr_alloc(&client->resource_idr, resource, 0, 0,
488 GFP_NOWAIT);
489 if (ret >= 0) {
490 resource->handle = ret;
491 client_get(client);
492 schedule_if_iso_resource(resource);
493 }
494
495 spin_unlock_irqrestore(&client->lock, flags);
496 if (preload)
497 idr_preload_end();
498
499 return ret < 0 ? ret : 0;
500 }
501
502 static int release_client_resource(struct client *client, u32 handle,
503 client_resource_release_fn_t release,
504 struct client_resource **return_resource)
505 {
506 struct client_resource *resource;
507
508 spin_lock_irq(&client->lock);
509 if (client->in_shutdown)
510 resource = NULL;
511 else
512 resource = idr_find(&client->resource_idr, handle);
513 if (resource && resource->release == release)
514 idr_remove(&client->resource_idr, handle);
515 spin_unlock_irq(&client->lock);
516
517 if (!(resource && resource->release == release))
518 return -EINVAL;
519
520 if (return_resource)
521 *return_resource = resource;
522 else
523 resource->release(client, resource);
524
525 client_put(client);
526
527 return 0;
528 }
529
530 static void release_transaction(struct client *client,
531 struct client_resource *resource)
532 {
533 }
534
535 static void complete_transaction(struct fw_card *card, int rcode,
536 void *payload, size_t length, void *data)
537 {
538 struct outbound_transaction_event *e = data;
539 struct fw_cdev_event_response *rsp = &e->response;
540 struct client *client = e->client;
541 unsigned long flags;
542
543 if (length < rsp->length)
544 rsp->length = length;
545 if (rcode == RCODE_COMPLETE)
546 memcpy(rsp->data, payload, rsp->length);
547
548 spin_lock_irqsave(&client->lock, flags);
549 idr_remove(&client->resource_idr, e->r.resource.handle);
550 if (client->in_shutdown)
551 wake_up(&client->tx_flush_wait);
552 spin_unlock_irqrestore(&client->lock, flags);
553
554 rsp->type = FW_CDEV_EVENT_RESPONSE;
555 rsp->rcode = rcode;
556
557 /*
558 * In the case that sizeof(*rsp) doesn't align with the position of the
559 * data, and the read is short, preserve an extra copy of the data
560 * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless
561 * for short reads and some apps depended on it, this is both safe
562 * and prudent for compatibility.
563 */
564 if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
565 queue_event(client, &e->event, rsp, sizeof(*rsp),
566 rsp->data, rsp->length);
567 else
568 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
569 NULL, 0);
570
571 /* Drop the idr's reference */
572 client_put(client);
573 }
574
575 static int init_request(struct client *client,
576 struct fw_cdev_send_request *request,
577 int destination_id, int speed)
578 {
579 struct outbound_transaction_event *e;
580 int ret;
581
582 if (request->tcode != TCODE_STREAM_DATA &&
583 (request->length > 4096 || request->length > 512 << speed))
584 return -EIO;
585
586 if (request->tcode == TCODE_WRITE_QUADLET_REQUEST &&
587 request->length < 4)
588 return -EINVAL;
589
590 e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
591 if (e == NULL)
592 return -ENOMEM;
593
594 e->client = client;
595 e->response.length = request->length;
596 e->response.closure = request->closure;
597
598 if (request->data &&
599 copy_from_user(e->response.data,
600 u64_to_uptr(request->data), request->length)) {
601 ret = -EFAULT;
602 goto failed;
603 }
604
605 e->r.resource.release = release_transaction;
606 ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
607 if (ret < 0)
608 goto failed;
609
610 fw_send_request(client->device->card, &e->r.transaction,
611 request->tcode, destination_id, request->generation,
612 speed, request->offset, e->response.data,
613 request->length, complete_transaction, e);
614 return 0;
615
616 failed:
617 kfree(e);
618
619 return ret;
620 }
621
622 static int ioctl_send_request(struct client *client, union ioctl_arg *arg)
623 {
624 switch (arg->send_request.tcode) {
625 case TCODE_WRITE_QUADLET_REQUEST:
626 case TCODE_WRITE_BLOCK_REQUEST:
627 case TCODE_READ_QUADLET_REQUEST:
628 case TCODE_READ_BLOCK_REQUEST:
629 case TCODE_LOCK_MASK_SWAP:
630 case TCODE_LOCK_COMPARE_SWAP:
631 case TCODE_LOCK_FETCH_ADD:
632 case TCODE_LOCK_LITTLE_ADD:
633 case TCODE_LOCK_BOUNDED_ADD:
634 case TCODE_LOCK_WRAP_ADD:
635 case TCODE_LOCK_VENDOR_DEPENDENT:
636 break;
637 default:
638 return -EINVAL;
639 }
640
641 return init_request(client, &arg->send_request, client->device->node_id,
642 client->device->max_speed);
643 }
644
645 static inline bool is_fcp_request(struct fw_request *request)
646 {
647 return request == NULL;
648 }
649
650 static void release_request(struct client *client,
651 struct client_resource *resource)
652 {
653 struct inbound_transaction_resource *r = container_of(resource,
654 struct inbound_transaction_resource, resource);
655
656 if (is_fcp_request(r->request))
657 kfree(r->data);
658 else
659 fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR);
660
661 fw_card_put(r->card);
662 kfree(r);
663 }
664
665 static void handle_request(struct fw_card *card, struct fw_request *request,
666 int tcode, int destination, int source,
667 int generation, unsigned long long offset,
668 void *payload, size_t length, void *callback_data)
669 {
670 struct address_handler_resource *handler = callback_data;
671 struct inbound_transaction_resource *r;
672 struct inbound_transaction_event *e;
673 size_t event_size0;
674 void *fcp_frame = NULL;
675 int ret;
676
677 /* card may be different from handler->client->device->card */
678 fw_card_get(card);
679
680 r = kmalloc(sizeof(*r), GFP_ATOMIC);
681 e = kmalloc(sizeof(*e), GFP_ATOMIC);
682 if (r == NULL || e == NULL)
683 goto failed;
684
685 r->card = card;
686 r->request = request;
687 r->data = payload;
688 r->length = length;
689
690 if (is_fcp_request(request)) {
691 /*
692 * FIXME: Let core-transaction.c manage a
693 * single reference-counted copy?
694 */
695 fcp_frame = kmemdup(payload, length, GFP_ATOMIC);
696 if (fcp_frame == NULL)
697 goto failed;
698
699 r->data = fcp_frame;
700 }
701
702 r->resource.release = release_request;
703 ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
704 if (ret < 0)
705 goto failed;
706
707 if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) {
708 struct fw_cdev_event_request *req = &e->req.request;
709
710 if (tcode & 0x10)
711 tcode = TCODE_LOCK_REQUEST;
712
713 req->type = FW_CDEV_EVENT_REQUEST;
714 req->tcode = tcode;
715 req->offset = offset;
716 req->length = length;
717 req->handle = r->resource.handle;
718 req->closure = handler->closure;
719 event_size0 = sizeof(*req);
720 } else {
721 struct fw_cdev_event_request2 *req = &e->req.request2;
722
723 req->type = FW_CDEV_EVENT_REQUEST2;
724 req->tcode = tcode;
725 req->offset = offset;
726 req->source_node_id = source;
727 req->destination_node_id = destination;
728 req->card = card->index;
729 req->generation = generation;
730 req->length = length;
731 req->handle = r->resource.handle;
732 req->closure = handler->closure;
733 event_size0 = sizeof(*req);
734 }
735
736 queue_event(handler->client, &e->event,
737 &e->req, event_size0, r->data, length);
738 return;
739
740 failed:
741 kfree(r);
742 kfree(e);
743 kfree(fcp_frame);
744
745 if (!is_fcp_request(request))
746 fw_send_response(card, request, RCODE_CONFLICT_ERROR);
747
748 fw_card_put(card);
749 }
750
751 static void release_address_handler(struct client *client,
752 struct client_resource *resource)
753 {
754 struct address_handler_resource *r =
755 container_of(resource, struct address_handler_resource, resource);
756
757 fw_core_remove_address_handler(&r->handler);
758 kfree(r);
759 }
760
761 static int ioctl_allocate(struct client *client, union ioctl_arg *arg)
762 {
763 struct fw_cdev_allocate *a = &arg->allocate;
764 struct address_handler_resource *r;
765 struct fw_address_region region;
766 int ret;
767
768 r = kmalloc(sizeof(*r), GFP_KERNEL);
769 if (r == NULL)
770 return -ENOMEM;
771
772 region.start = a->offset;
773 if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END)
774 region.end = a->offset + a->length;
775 else
776 region.end = a->region_end;
777
778 r->handler.length = a->length;
779 r->handler.address_callback = handle_request;
780 r->handler.callback_data = r;
781 r->closure = a->closure;
782 r->client = client;
783
784 ret = fw_core_add_address_handler(&r->handler, &region);
785 if (ret < 0) {
786 kfree(r);
787 return ret;
788 }
789 a->offset = r->handler.offset;
790
791 r->resource.release = release_address_handler;
792 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
793 if (ret < 0) {
794 release_address_handler(client, &r->resource);
795 return ret;
796 }
797 a->handle = r->resource.handle;
798
799 return 0;
800 }
801
802 static int ioctl_deallocate(struct client *client, union ioctl_arg *arg)
803 {
804 return release_client_resource(client, arg->deallocate.handle,
805 release_address_handler, NULL);
806 }
807
808 static int ioctl_send_response(struct client *client, union ioctl_arg *arg)
809 {
810 struct fw_cdev_send_response *a = &arg->send_response;
811 struct client_resource *resource;
812 struct inbound_transaction_resource *r;
813 int ret = 0;
814
815 if (release_client_resource(client, a->handle,
816 release_request, &resource) < 0)
817 return -EINVAL;
818
819 r = container_of(resource, struct inbound_transaction_resource,
820 resource);
821 if (is_fcp_request(r->request))
822 goto out;
823
824 if (a->length != fw_get_response_length(r->request)) {
825 ret = -EINVAL;
826 kfree(r->request);
827 goto out;
828 }
829 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) {
830 ret = -EFAULT;
831 kfree(r->request);
832 goto out;
833 }
834 fw_send_response(r->card, r->request, a->rcode);
835 out:
836 fw_card_put(r->card);
837 kfree(r);
838
839 return ret;
840 }
841
842 static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg)
843 {
844 fw_schedule_bus_reset(client->device->card, true,
845 arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET);
846 return 0;
847 }
848
849 static void release_descriptor(struct client *client,
850 struct client_resource *resource)
851 {
852 struct descriptor_resource *r =
853 container_of(resource, struct descriptor_resource, resource);
854
855 fw_core_remove_descriptor(&r->descriptor);
856 kfree(r);
857 }
858
859 static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg)
860 {
861 struct fw_cdev_add_descriptor *a = &arg->add_descriptor;
862 struct descriptor_resource *r;
863 int ret;
864
865 /* Access policy: Allow this ioctl only on local nodes' device files. */
866 if (!client->device->is_local)
867 return -ENOSYS;
868
869 if (a->length > 256)
870 return -EINVAL;
871
872 r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL);
873 if (r == NULL)
874 return -ENOMEM;
875
876 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) {
877 ret = -EFAULT;
878 goto failed;
879 }
880
881 r->descriptor.length = a->length;
882 r->descriptor.immediate = a->immediate;
883 r->descriptor.key = a->key;
884 r->descriptor.data = r->data;
885
886 ret = fw_core_add_descriptor(&r->descriptor);
887 if (ret < 0)
888 goto failed;
889
890 r->resource.release = release_descriptor;
891 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
892 if (ret < 0) {
893 fw_core_remove_descriptor(&r->descriptor);
894 goto failed;
895 }
896 a->handle = r->resource.handle;
897
898 return 0;
899 failed:
900 kfree(r);
901
902 return ret;
903 }
904
905 static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg)
906 {
907 return release_client_resource(client, arg->remove_descriptor.handle,
908 release_descriptor, NULL);
909 }
910
911 static void iso_callback(struct fw_iso_context *context, u32 cycle,
912 size_t header_length, void *header, void *data)
913 {
914 struct client *client = data;
915 struct iso_interrupt_event *e;
916
917 e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC);
918 if (e == NULL)
919 return;
920
921 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
922 e->interrupt.closure = client->iso_closure;
923 e->interrupt.cycle = cycle;
924 e->interrupt.header_length = header_length;
925 memcpy(e->interrupt.header, header, header_length);
926 queue_event(client, &e->event, &e->interrupt,
927 sizeof(e->interrupt) + header_length, NULL, 0);
928 }
929
930 static void iso_mc_callback(struct fw_iso_context *context,
931 dma_addr_t completed, void *data)
932 {
933 struct client *client = data;
934 struct iso_interrupt_mc_event *e;
935
936 e = kmalloc(sizeof(*e), GFP_ATOMIC);
937 if (e == NULL)
938 return;
939
940 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL;
941 e->interrupt.closure = client->iso_closure;
942 e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer,
943 completed);
944 queue_event(client, &e->event, &e->interrupt,
945 sizeof(e->interrupt), NULL, 0);
946 }
947
948 static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context)
949 {
950 if (context->type == FW_ISO_CONTEXT_TRANSMIT)
951 return DMA_TO_DEVICE;
952 else
953 return DMA_FROM_DEVICE;
954 }
955
956 static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
957 {
958 struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
959 struct fw_iso_context *context;
960 fw_iso_callback_t cb;
961 int ret;
962
963 BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||
964 FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE ||
965 FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL !=
966 FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL);
967
968 switch (a->type) {
969 case FW_ISO_CONTEXT_TRANSMIT:
970 if (a->speed > SCODE_3200 || a->channel > 63)
971 return -EINVAL;
972
973 cb = iso_callback;
974 break;
975
976 case FW_ISO_CONTEXT_RECEIVE:
977 if (a->header_size < 4 || (a->header_size & 3) ||
978 a->channel > 63)
979 return -EINVAL;
980
981 cb = iso_callback;
982 break;
983
984 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
985 cb = (fw_iso_callback_t)iso_mc_callback;
986 break;
987
988 default:
989 return -EINVAL;
990 }
991
992 context = fw_iso_context_create(client->device->card, a->type,
993 a->channel, a->speed, a->header_size, cb, client);
994 if (IS_ERR(context))
995 return PTR_ERR(context);
996 if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW)
997 context->drop_overflow_headers = true;
998
999 /* We only support one context at this time. */
1000 spin_lock_irq(&client->lock);
1001 if (client->iso_context != NULL) {
1002 spin_unlock_irq(&client->lock);
1003 fw_iso_context_destroy(context);
1004
1005 return -EBUSY;
1006 }
1007 if (!client->buffer_is_mapped) {
1008 ret = fw_iso_buffer_map_dma(&client->buffer,
1009 client->device->card,
1010 iso_dma_direction(context));
1011 if (ret < 0) {
1012 spin_unlock_irq(&client->lock);
1013 fw_iso_context_destroy(context);
1014
1015 return ret;
1016 }
1017 client->buffer_is_mapped = true;
1018 }
1019 client->iso_closure = a->closure;
1020 client->iso_context = context;
1021 spin_unlock_irq(&client->lock);
1022
1023 a->handle = 0;
1024
1025 return 0;
1026 }
1027
1028 static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg)
1029 {
1030 struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels;
1031 struct fw_iso_context *ctx = client->iso_context;
1032
1033 if (ctx == NULL || a->handle != 0)
1034 return -EINVAL;
1035
1036 return fw_iso_context_set_channels(ctx, &a->channels);
1037 }
1038
1039 /* Macros for decoding the iso packet control header. */
1040 #define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff)
1041 #define GET_INTERRUPT(v) (((v) >> 16) & 0x01)
1042 #define GET_SKIP(v) (((v) >> 17) & 0x01)
1043 #define GET_TAG(v) (((v) >> 18) & 0x03)
1044 #define GET_SY(v) (((v) >> 20) & 0x0f)
1045 #define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff)
1046
1047 static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
1048 {
1049 struct fw_cdev_queue_iso *a = &arg->queue_iso;
1050 struct fw_cdev_iso_packet __user *p, *end, *next;
1051 struct fw_iso_context *ctx = client->iso_context;
1052 unsigned long payload, buffer_end, transmit_header_bytes = 0;
1053 u32 control;
1054 int count;
1055 struct {
1056 struct fw_iso_packet packet;
1057 u8 header[256];
1058 } u;
1059
1060 if (ctx == NULL || a->handle != 0)
1061 return -EINVAL;
1062
1063 /*
1064 * If the user passes a non-NULL data pointer, has mmap()'ed
1065 * the iso buffer, and the pointer points inside the buffer,
1066 * we setup the payload pointers accordingly. Otherwise we
1067 * set them both to 0, which will still let packets with
1068 * payload_length == 0 through. In other words, if no packets
1069 * use the indirect payload, the iso buffer need not be mapped
1070 * and the a->data pointer is ignored.
1071 */
1072 payload = (unsigned long)a->data - client->vm_start;
1073 buffer_end = client->buffer.page_count << PAGE_SHIFT;
1074 if (a->data == 0 || client->buffer.pages == NULL ||
1075 payload >= buffer_end) {
1076 payload = 0;
1077 buffer_end = 0;
1078 }
1079
1080 if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3)
1081 return -EINVAL;
1082
1083 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);
1084 if (!access_ok(p, a->size))
1085 return -EFAULT;
1086
1087 end = (void __user *)p + a->size;
1088 count = 0;
1089 while (p < end) {
1090 if (get_user(control, &p->control))
1091 return -EFAULT;
1092 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
1093 u.packet.interrupt = GET_INTERRUPT(control);
1094 u.packet.skip = GET_SKIP(control);
1095 u.packet.tag = GET_TAG(control);
1096 u.packet.sy = GET_SY(control);
1097 u.packet.header_length = GET_HEADER_LENGTH(control);
1098
1099 switch (ctx->type) {
1100 case FW_ISO_CONTEXT_TRANSMIT:
1101 if (u.packet.header_length & 3)
1102 return -EINVAL;
1103 transmit_header_bytes = u.packet.header_length;
1104 break;
1105
1106 case FW_ISO_CONTEXT_RECEIVE:
1107 if (u.packet.header_length == 0 ||
1108 u.packet.header_length % ctx->header_size != 0)
1109 return -EINVAL;
1110 break;
1111
1112 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
1113 if (u.packet.payload_length == 0 ||
1114 u.packet.payload_length & 3)
1115 return -EINVAL;
1116 break;
1117 }
1118
1119 next = (struct fw_cdev_iso_packet __user *)
1120 &p->header[transmit_header_bytes / 4];
1121 if (next > end)
1122 return -EINVAL;
1123 if (__copy_from_user
1124 (u.packet.header, p->header, transmit_header_bytes))
1125 return -EFAULT;
1126 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
1127 u.packet.header_length + u.packet.payload_length > 0)
1128 return -EINVAL;
1129 if (payload + u.packet.payload_length > buffer_end)
1130 return -EINVAL;
1131
1132 if (fw_iso_context_queue(ctx, &u.packet,
1133 &client->buffer, payload))
1134 break;
1135
1136 p = next;
1137 payload += u.packet.payload_length;
1138 count++;
1139 }
1140 fw_iso_context_queue_flush(ctx);
1141
1142 a->size -= uptr_to_u64(p) - a->packets;
1143 a->packets = uptr_to_u64(p);
1144 a->data = client->vm_start + payload;
1145
1146 return count;
1147 }
1148
1149 static int ioctl_start_iso(struct client *client, union ioctl_arg *arg)
1150 {
1151 struct fw_cdev_start_iso *a = &arg->start_iso;
1152
1153 BUILD_BUG_ON(
1154 FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 ||
1155 FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 ||
1156 FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 ||
1157 FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 ||
1158 FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS);
1159
1160 if (client->iso_context == NULL || a->handle != 0)
1161 return -EINVAL;
1162
1163 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE &&
1164 (a->tags == 0 || a->tags > 15 || a->sync > 15))
1165 return -EINVAL;
1166
1167 return fw_iso_context_start(client->iso_context,
1168 a->cycle, a->sync, a->tags);
1169 }
1170
1171 static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg)
1172 {
1173 struct fw_cdev_stop_iso *a = &arg->stop_iso;
1174
1175 if (client->iso_context == NULL || a->handle != 0)
1176 return -EINVAL;
1177
1178 return fw_iso_context_stop(client->iso_context);
1179 }
1180
1181 static int ioctl_flush_iso(struct client *client, union ioctl_arg *arg)
1182 {
1183 struct fw_cdev_flush_iso *a = &arg->flush_iso;
1184
1185 if (client->iso_context == NULL || a->handle != 0)
1186 return -EINVAL;
1187
1188 return fw_iso_context_flush_completions(client->iso_context);
1189 }
1190
1191 static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg)
1192 {
1193 struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2;
1194 struct fw_card *card = client->device->card;
1195 struct timespec64 ts = {0, 0};
1196 u32 cycle_time;
1197 int ret = 0;
1198
1199 local_irq_disable();
1200
1201 cycle_time = card->driver->read_csr(card, CSR_CYCLE_TIME);
1202
1203 switch (a->clk_id) {
1204 case CLOCK_REALTIME: ktime_get_real_ts64(&ts); break;
1205 case CLOCK_MONOTONIC: ktime_get_ts64(&ts); break;
1206 case CLOCK_MONOTONIC_RAW: ktime_get_raw_ts64(&ts); break;
1207 default:
1208 ret = -EINVAL;
1209 }
1210
1211 local_irq_enable();
1212
1213 a->tv_sec = ts.tv_sec;
1214 a->tv_nsec = ts.tv_nsec;
1215 a->cycle_timer = cycle_time;
1216
1217 return ret;
1218 }
1219
1220 static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg)
1221 {
1222 struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer;
1223 struct fw_cdev_get_cycle_timer2 ct2;
1224
1225 ct2.clk_id = CLOCK_REALTIME;
1226 ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2);
1227
1228 a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC;
1229 a->cycle_timer = ct2.cycle_timer;
1230
1231 return 0;
1232 }
1233
1234 static void iso_resource_work(struct work_struct *work)
1235 {
1236 struct iso_resource_event *e;
1237 struct iso_resource *r =
1238 container_of(work, struct iso_resource, work.work);
1239 struct client *client = r->client;
1240 int generation, channel, bandwidth, todo;
1241 bool skip, free, success;
1242
1243 spin_lock_irq(&client->lock);
1244 generation = client->device->generation;
1245 todo = r->todo;
1246 /* Allow 1000ms grace period for other reallocations. */
1247 if (todo == ISO_RES_ALLOC &&
1248 time_before64(get_jiffies_64(),
1249 client->device->card->reset_jiffies + HZ)) {
1250 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
1251 skip = true;
1252 } else {
1253 /* We could be called twice within the same generation. */
1254 skip = todo == ISO_RES_REALLOC &&
1255 r->generation == generation;
1256 }
1257 free = todo == ISO_RES_DEALLOC ||
1258 todo == ISO_RES_ALLOC_ONCE ||
1259 todo == ISO_RES_DEALLOC_ONCE;
1260 r->generation = generation;
1261 spin_unlock_irq(&client->lock);
1262
1263 if (skip)
1264 goto out;
1265
1266 bandwidth = r->bandwidth;
1267
1268 fw_iso_resource_manage(client->device->card, generation,
1269 r->channels, &channel, &bandwidth,
1270 todo == ISO_RES_ALLOC ||
1271 todo == ISO_RES_REALLOC ||
1272 todo == ISO_RES_ALLOC_ONCE);
1273 /*
1274 * Is this generation outdated already? As long as this resource sticks
1275 * in the idr, it will be scheduled again for a newer generation or at
1276 * shutdown.
1277 */
1278 if (channel == -EAGAIN &&
1279 (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1280 goto out;
1281
1282 success = channel >= 0 || bandwidth > 0;
1283
1284 spin_lock_irq(&client->lock);
1285 /*
1286 * Transit from allocation to reallocation, except if the client
1287 * requested deallocation in the meantime.
1288 */
1289 if (r->todo == ISO_RES_ALLOC)
1290 r->todo = ISO_RES_REALLOC;
1291 /*
1292 * Allocation or reallocation failure? Pull this resource out of the
1293 * idr and prepare for deletion, unless the client is shutting down.
1294 */
1295 if (r->todo == ISO_RES_REALLOC && !success &&
1296 !client->in_shutdown &&
1297 idr_remove(&client->resource_idr, r->resource.handle)) {
1298 client_put(client);
1299 free = true;
1300 }
1301 spin_unlock_irq(&client->lock);
1302
1303 if (todo == ISO_RES_ALLOC && channel >= 0)
1304 r->channels = 1ULL << channel;
1305
1306 if (todo == ISO_RES_REALLOC && success)
1307 goto out;
1308
1309 if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1310 e = r->e_alloc;
1311 r->e_alloc = NULL;
1312 } else {
1313 e = r->e_dealloc;
1314 r->e_dealloc = NULL;
1315 }
1316 e->iso_resource.handle = r->resource.handle;
1317 e->iso_resource.channel = channel;
1318 e->iso_resource.bandwidth = bandwidth;
1319
1320 queue_event(client, &e->event,
1321 &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
1322
1323 if (free) {
1324 cancel_delayed_work(&r->work);
1325 kfree(r->e_alloc);
1326 kfree(r->e_dealloc);
1327 kfree(r);
1328 }
1329 out:
1330 client_put(client);
1331 }
1332
1333 static void release_iso_resource(struct client *client,
1334 struct client_resource *resource)
1335 {
1336 struct iso_resource *r =
1337 container_of(resource, struct iso_resource, resource);
1338
1339 spin_lock_irq(&client->lock);
1340 r->todo = ISO_RES_DEALLOC;
1341 schedule_iso_resource(r, 0);
1342 spin_unlock_irq(&client->lock);
1343 }
1344
1345 static int init_iso_resource(struct client *client,
1346 struct fw_cdev_allocate_iso_resource *request, int todo)
1347 {
1348 struct iso_resource_event *e1, *e2;
1349 struct iso_resource *r;
1350 int ret;
1351
1352 if ((request->channels == 0 && request->bandwidth == 0) ||
1353 request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL)
1354 return -EINVAL;
1355
1356 r = kmalloc(sizeof(*r), GFP_KERNEL);
1357 e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1358 e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1359 if (r == NULL || e1 == NULL || e2 == NULL) {
1360 ret = -ENOMEM;
1361 goto fail;
1362 }
1363
1364 INIT_DELAYED_WORK(&r->work, iso_resource_work);
1365 r->client = client;
1366 r->todo = todo;
1367 r->generation = -1;
1368 r->channels = request->channels;
1369 r->bandwidth = request->bandwidth;
1370 r->e_alloc = e1;
1371 r->e_dealloc = e2;
1372
1373 e1->iso_resource.closure = request->closure;
1374 e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1375 e2->iso_resource.closure = request->closure;
1376 e2->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1377
1378 if (todo == ISO_RES_ALLOC) {
1379 r->resource.release = release_iso_resource;
1380 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1381 if (ret < 0)
1382 goto fail;
1383 } else {
1384 r->resource.release = NULL;
1385 r->resource.handle = -1;
1386 schedule_iso_resource(r, 0);
1387 }
1388 request->handle = r->resource.handle;
1389
1390 return 0;
1391 fail:
1392 kfree(r);
1393 kfree(e1);
1394 kfree(e2);
1395
1396 return ret;
1397 }
1398
1399 static int ioctl_allocate_iso_resource(struct client *client,
1400 union ioctl_arg *arg)
1401 {
1402 return init_iso_resource(client,
1403 &arg->allocate_iso_resource, ISO_RES_ALLOC);
1404 }
1405
1406 static int ioctl_deallocate_iso_resource(struct client *client,
1407 union ioctl_arg *arg)
1408 {
1409 return release_client_resource(client,
1410 arg->deallocate.handle, release_iso_resource, NULL);
1411 }
1412
1413 static int ioctl_allocate_iso_resource_once(struct client *client,
1414 union ioctl_arg *arg)
1415 {
1416 return init_iso_resource(client,
1417 &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE);
1418 }
1419
1420 static int ioctl_deallocate_iso_resource_once(struct client *client,
1421 union ioctl_arg *arg)
1422 {
1423 return init_iso_resource(client,
1424 &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE);
1425 }
1426
1427 /*
1428 * Returns a speed code: Maximum speed to or from this device,
1429 * limited by the device's link speed, the local node's link speed,
1430 * and all PHY port speeds between the two links.
1431 */
1432 static int ioctl_get_speed(struct client *client, union ioctl_arg *arg)
1433 {
1434 return client->device->max_speed;
1435 }
1436
1437 static int ioctl_send_broadcast_request(struct client *client,
1438 union ioctl_arg *arg)
1439 {
1440 struct fw_cdev_send_request *a = &arg->send_request;
1441
1442 switch (a->tcode) {
1443 case TCODE_WRITE_QUADLET_REQUEST:
1444 case TCODE_WRITE_BLOCK_REQUEST:
1445 break;
1446 default:
1447 return -EINVAL;
1448 }
1449
1450 /* Security policy: Only allow accesses to Units Space. */
1451 if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1452 return -EACCES;
1453
1454 return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100);
1455 }
1456
1457 static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg)
1458 {
1459 struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet;
1460 struct fw_cdev_send_request request;
1461 int dest;
1462
1463 if (a->speed > client->device->card->link_speed ||
1464 a->length > 1024 << a->speed)
1465 return -EIO;
1466
1467 if (a->tag > 3 || a->channel > 63 || a->sy > 15)
1468 return -EINVAL;
1469
1470 dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy);
1471 request.tcode = TCODE_STREAM_DATA;
1472 request.length = a->length;
1473 request.closure = a->closure;
1474 request.data = a->data;
1475 request.generation = a->generation;
1476
1477 return init_request(client, &request, dest, a->speed);
1478 }
1479
1480 static void outbound_phy_packet_callback(struct fw_packet *packet,
1481 struct fw_card *card, int status)
1482 {
1483 struct outbound_phy_packet_event *e =
1484 container_of(packet, struct outbound_phy_packet_event, p);
1485
1486 switch (status) {
1487 /* expected: */
1488 case ACK_COMPLETE: e->phy_packet.rcode = RCODE_COMPLETE; break;
1489 /* should never happen with PHY packets: */
1490 case ACK_PENDING: e->phy_packet.rcode = RCODE_COMPLETE; break;
1491 case ACK_BUSY_X:
1492 case ACK_BUSY_A:
1493 case ACK_BUSY_B: e->phy_packet.rcode = RCODE_BUSY; break;
1494 case ACK_DATA_ERROR: e->phy_packet.rcode = RCODE_DATA_ERROR; break;
1495 case ACK_TYPE_ERROR: e->phy_packet.rcode = RCODE_TYPE_ERROR; break;
1496 /* stale generation; cancelled; on certain controllers: no ack */
1497 default: e->phy_packet.rcode = status; break;
1498 }
1499 e->phy_packet.data[0] = packet->timestamp;
1500
1501 queue_event(e->client, &e->event, &e->phy_packet,
1502 sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0);
1503 client_put(e->client);
1504 }
1505
1506 static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg)
1507 {
1508 struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet;
1509 struct fw_card *card = client->device->card;
1510 struct outbound_phy_packet_event *e;
1511
1512 /* Access policy: Allow this ioctl only on local nodes' device files. */
1513 if (!client->device->is_local)
1514 return -ENOSYS;
1515
1516 e = kzalloc(sizeof(*e) + 4, GFP_KERNEL);
1517 if (e == NULL)
1518 return -ENOMEM;
1519
1520 client_get(client);
1521 e->client = client;
1522 e->p.speed = SCODE_100;
1523 e->p.generation = a->generation;
1524 e->p.header[0] = TCODE_LINK_INTERNAL << 4;
1525 e->p.header[1] = a->data[0];
1526 e->p.header[2] = a->data[1];
1527 e->p.header_length = 12;
1528 e->p.callback = outbound_phy_packet_callback;
1529 e->phy_packet.closure = a->closure;
1530 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_SENT;
1531 if (is_ping_packet(a->data))
1532 e->phy_packet.length = 4;
1533
1534 card->driver->send_request(card, &e->p);
1535
1536 return 0;
1537 }
1538
1539 static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg)
1540 {
1541 struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets;
1542 struct fw_card *card = client->device->card;
1543
1544 /* Access policy: Allow this ioctl only on local nodes' device files. */
1545 if (!client->device->is_local)
1546 return -ENOSYS;
1547
1548 spin_lock_irq(&card->lock);
1549
1550 list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list);
1551 client->phy_receiver_closure = a->closure;
1552
1553 spin_unlock_irq(&card->lock);
1554
1555 return 0;
1556 }
1557
1558 void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p)
1559 {
1560 struct client *client;
1561 struct inbound_phy_packet_event *e;
1562 unsigned long flags;
1563
1564 spin_lock_irqsave(&card->lock, flags);
1565
1566 list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) {
1567 e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC);
1568 if (e == NULL)
1569 break;
1570
1571 e->phy_packet.closure = client->phy_receiver_closure;
1572 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED;
1573 e->phy_packet.rcode = RCODE_COMPLETE;
1574 e->phy_packet.length = 8;
1575 e->phy_packet.data[0] = p->header[1];
1576 e->phy_packet.data[1] = p->header[2];
1577 queue_event(client, &e->event,
1578 &e->phy_packet, sizeof(e->phy_packet) + 8, NULL, 0);
1579 }
1580
1581 spin_unlock_irqrestore(&card->lock, flags);
1582 }
1583
1584 static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = {
1585 [0x00] = ioctl_get_info,
1586 [0x01] = ioctl_send_request,
1587 [0x02] = ioctl_allocate,
1588 [0x03] = ioctl_deallocate,
1589 [0x04] = ioctl_send_response,
1590 [0x05] = ioctl_initiate_bus_reset,
1591 [0x06] = ioctl_add_descriptor,
1592 [0x07] = ioctl_remove_descriptor,
1593 [0x08] = ioctl_create_iso_context,
1594 [0x09] = ioctl_queue_iso,
1595 [0x0a] = ioctl_start_iso,
1596 [0x0b] = ioctl_stop_iso,
1597 [0x0c] = ioctl_get_cycle_timer,
1598 [0x0d] = ioctl_allocate_iso_resource,
1599 [0x0e] = ioctl_deallocate_iso_resource,
1600 [0x0f] = ioctl_allocate_iso_resource_once,
1601 [0x10] = ioctl_deallocate_iso_resource_once,
1602 [0x11] = ioctl_get_speed,
1603 [0x12] = ioctl_send_broadcast_request,
1604 [0x13] = ioctl_send_stream_packet,
1605 [0x14] = ioctl_get_cycle_timer2,
1606 [0x15] = ioctl_send_phy_packet,
1607 [0x16] = ioctl_receive_phy_packets,
1608 [0x17] = ioctl_set_iso_channels,
1609 [0x18] = ioctl_flush_iso,
1610 };
1611
1612 static int dispatch_ioctl(struct client *client,
1613 unsigned int cmd, void __user *arg)
1614 {
1615 union ioctl_arg buffer;
1616 int ret;
1617
1618 if (fw_device_is_shutdown(client->device))
1619 return -ENODEV;
1620
1621 if (_IOC_TYPE(cmd) != '#' ||
1622 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) ||
1623 _IOC_SIZE(cmd) > sizeof(buffer))
1624 return -ENOTTY;
1625
1626 memset(&buffer, 0, sizeof(buffer));
1627
1628 if (_IOC_DIR(cmd) & _IOC_WRITE)
1629 if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd)))
1630 return -EFAULT;
1631
1632 ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer);
1633 if (ret < 0)
1634 return ret;
1635
1636 if (_IOC_DIR(cmd) & _IOC_READ)
1637 if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd)))
1638 return -EFAULT;
1639
1640 return ret;
1641 }
1642
1643 static long fw_device_op_ioctl(struct file *file,
1644 unsigned int cmd, unsigned long arg)
1645 {
1646 return dispatch_ioctl(file->private_data, cmd, (void __user *)arg);
1647 }
1648
1649 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1650 {
1651 struct client *client = file->private_data;
1652 unsigned long size;
1653 int page_count, ret;
1654
1655 if (fw_device_is_shutdown(client->device))
1656 return -ENODEV;
1657
1658 /* FIXME: We could support multiple buffers, but we don't. */
1659 if (client->buffer.pages != NULL)
1660 return -EBUSY;
1661
1662 if (!(vma->vm_flags & VM_SHARED))
1663 return -EINVAL;
1664
1665 if (vma->vm_start & ~PAGE_MASK)
1666 return -EINVAL;
1667
1668 client->vm_start = vma->vm_start;
1669 size = vma->vm_end - vma->vm_start;
1670 page_count = size >> PAGE_SHIFT;
1671 if (size & ~PAGE_MASK)
1672 return -EINVAL;
1673
1674 ret = fw_iso_buffer_alloc(&client->buffer, page_count);
1675 if (ret < 0)
1676 return ret;
1677
1678 spin_lock_irq(&client->lock);
1679 if (client->iso_context) {
1680 ret = fw_iso_buffer_map_dma(&client->buffer,
1681 client->device->card,
1682 iso_dma_direction(client->iso_context));
1683 client->buffer_is_mapped = (ret == 0);
1684 }
1685 spin_unlock_irq(&client->lock);
1686 if (ret < 0)
1687 goto fail;
1688
1689 ret = vm_map_pages_zero(vma, client->buffer.pages,
1690 client->buffer.page_count);
1691 if (ret < 0)
1692 goto fail;
1693
1694 return 0;
1695 fail:
1696 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1697 return ret;
1698 }
1699
1700 static int is_outbound_transaction_resource(int id, void *p, void *data)
1701 {
1702 struct client_resource *resource = p;
1703
1704 return resource->release == release_transaction;
1705 }
1706
1707 static int has_outbound_transactions(struct client *client)
1708 {
1709 int ret;
1710
1711 spin_lock_irq(&client->lock);
1712 ret = idr_for_each(&client->resource_idr,
1713 is_outbound_transaction_resource, NULL);
1714 spin_unlock_irq(&client->lock);
1715
1716 return ret;
1717 }
1718
1719 static int shutdown_resource(int id, void *p, void *data)
1720 {
1721 struct client_resource *resource = p;
1722 struct client *client = data;
1723
1724 resource->release(client, resource);
1725 client_put(client);
1726
1727 return 0;
1728 }
1729
1730 static int fw_device_op_release(struct inode *inode, struct file *file)
1731 {
1732 struct client *client = file->private_data;
1733 struct event *event, *next_event;
1734
1735 spin_lock_irq(&client->device->card->lock);
1736 list_del(&client->phy_receiver_link);
1737 spin_unlock_irq(&client->device->card->lock);
1738
1739 mutex_lock(&client->device->client_list_mutex);
1740 list_del(&client->link);
1741 mutex_unlock(&client->device->client_list_mutex);
1742
1743 if (client->iso_context)
1744 fw_iso_context_destroy(client->iso_context);
1745
1746 if (client->buffer.pages)
1747 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1748
1749 /* Freeze client->resource_idr and client->event_list */
1750 spin_lock_irq(&client->lock);
1751 client->in_shutdown = true;
1752 spin_unlock_irq(&client->lock);
1753
1754 wait_event(client->tx_flush_wait, !has_outbound_transactions(client));
1755
1756 idr_for_each(&client->resource_idr, shutdown_resource, client);
1757 idr_destroy(&client->resource_idr);
1758
1759 list_for_each_entry_safe(event, next_event, &client->event_list, link)
1760 kfree(event);
1761
1762 client_put(client);
1763
1764 return 0;
1765 }
1766
1767 static __poll_t fw_device_op_poll(struct file *file, poll_table * pt)
1768 {
1769 struct client *client = file->private_data;
1770 __poll_t mask = 0;
1771
1772 poll_wait(file, &client->wait, pt);
1773
1774 if (fw_device_is_shutdown(client->device))
1775 mask |= EPOLLHUP | EPOLLERR;
1776 if (!list_empty(&client->event_list))
1777 mask |= EPOLLIN | EPOLLRDNORM;
1778
1779 return mask;
1780 }
1781
1782 const struct file_operations fw_device_ops = {
1783 .owner = THIS_MODULE,
1784 .llseek = no_llseek,
1785 .open = fw_device_op_open,
1786 .read = fw_device_op_read,
1787 .unlocked_ioctl = fw_device_op_ioctl,
1788 .mmap = fw_device_op_mmap,
1789 .release = fw_device_op_release,
1790 .poll = fw_device_op_poll,
1791 .compat_ioctl = compat_ptr_ioctl,
1792 };
connection oriented routing