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authorStefan Richter <stefanr@s5r6.in-berlin.de>2009-06-05 10:26:18 -0400
committerStefan Richter <stefanr@s5r6.in-berlin.de>2009-06-05 10:26:18 -0400
commite71d31da062095d8b0b02a26fb5e8879e8d3d0de (patch)
tree6d45660ec489d9d58bad51a02d8d8877b534e81b /drivers/firewire/fw-cdev.c
parent77c9a5daa9c4d9b37812c9c69c7bcbb3f9399c3c (diff)
firewire: rename source files
The source files of firewire-core, firewire-ohci, firewire-sbp2, i.e. "drivers/firewire/fw-*.c" are renamed to "drivers/firewire/core-*.c", "drivers/firewire/ohci.c", "drivers/firewire/sbp2.c". The old fw- prefix was redundant to the directory name. The new core- prefix distinguishes the files according to which driver they belong to. This change comes a little late, but still before further firewire drivers are added as anticipated RSN. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/fw-cdev.c')
-rw-r--r--drivers/firewire/fw-cdev.c1458
1 files changed, 0 insertions, 1458 deletions
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
deleted file mode 100644
index 042c04540474..000000000000
--- a/drivers/firewire/fw-cdev.c
+++ /dev/null
@@ -1,1458 +0,0 @@
1/*
2 * Char device for device raw access
3 *
4 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21#include <linux/compat.h>
22#include <linux/delay.h>
23#include <linux/device.h>
24#include <linux/errno.h>
25#include <linux/firewire.h>
26#include <linux/firewire-cdev.h>
27#include <linux/idr.h>
28#include <linux/jiffies.h>
29#include <linux/kernel.h>
30#include <linux/kref.h>
31#include <linux/mm.h>
32#include <linux/module.h>
33#include <linux/mutex.h>
34#include <linux/poll.h>
35#include <linux/preempt.h>
36#include <linux/spinlock.h>
37#include <linux/time.h>
38#include <linux/vmalloc.h>
39#include <linux/wait.h>
40#include <linux/workqueue.h>
41
42#include <asm/system.h>
43#include <asm/uaccess.h>
44
45#include "core.h"
46
47struct client {
48 u32 version;
49 struct fw_device *device;
50
51 spinlock_t lock;
52 bool in_shutdown;
53 struct idr resource_idr;
54 struct list_head event_list;
55 wait_queue_head_t 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
63 struct list_head link;
64 struct kref kref;
65};
66
67static inline void client_get(struct client *client)
68{
69 kref_get(&client->kref);
70}
71
72static void client_release(struct kref *kref)
73{
74 struct client *client = container_of(kref, struct client, kref);
75
76 fw_device_put(client->device);
77 kfree(client);
78}
79
80static void client_put(struct client *client)
81{
82 kref_put(&client->kref, client_release);
83}
84
85struct client_resource;
86typedef void (*client_resource_release_fn_t)(struct client *,
87 struct client_resource *);
88struct client_resource {
89 client_resource_release_fn_t release;
90 int handle;
91};
92
93struct address_handler_resource {
94 struct client_resource resource;
95 struct fw_address_handler handler;
96 __u64 closure;
97 struct client *client;
98};
99
100struct outbound_transaction_resource {
101 struct client_resource resource;
102 struct fw_transaction transaction;
103};
104
105struct inbound_transaction_resource {
106 struct client_resource resource;
107 struct fw_request *request;
108 void *data;
109 size_t length;
110};
111
112struct descriptor_resource {
113 struct client_resource resource;
114 struct fw_descriptor descriptor;
115 u32 data[0];
116};
117
118struct iso_resource {
119 struct client_resource resource;
120 struct client *client;
121 /* Schedule work and access todo only with client->lock held. */
122 struct delayed_work work;
123 enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
124 ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
125 int generation;
126 u64 channels;
127 s32 bandwidth;
128 struct iso_resource_event *e_alloc, *e_dealloc;
129};
130
131static void schedule_iso_resource(struct iso_resource *);
132static void release_iso_resource(struct client *, struct client_resource *);
133
134/*
135 * dequeue_event() just kfree()'s the event, so the event has to be
136 * the first field in a struct XYZ_event.
137 */
138struct event {
139 struct { void *data; size_t size; } v[2];
140 struct list_head link;
141};
142
143struct bus_reset_event {
144 struct event event;
145 struct fw_cdev_event_bus_reset reset;
146};
147
148struct outbound_transaction_event {
149 struct event event;
150 struct client *client;
151 struct outbound_transaction_resource r;
152 struct fw_cdev_event_response response;
153};
154
155struct inbound_transaction_event {
156 struct event event;
157 struct fw_cdev_event_request request;
158};
159
160struct iso_interrupt_event {
161 struct event event;
162 struct fw_cdev_event_iso_interrupt interrupt;
163};
164
165struct iso_resource_event {
166 struct event event;
167 struct fw_cdev_event_iso_resource resource;
168};
169
170static inline void __user *u64_to_uptr(__u64 value)
171{
172 return (void __user *)(unsigned long)value;
173}
174
175static inline __u64 uptr_to_u64(void __user *ptr)
176{
177 return (__u64)(unsigned long)ptr;
178}
179
180static int fw_device_op_open(struct inode *inode, struct file *file)
181{
182 struct fw_device *device;
183 struct client *client;
184
185 device = fw_device_get_by_devt(inode->i_rdev);
186 if (device == NULL)
187 return -ENODEV;
188
189 if (fw_device_is_shutdown(device)) {
190 fw_device_put(device);
191 return -ENODEV;
192 }
193
194 client = kzalloc(sizeof(*client), GFP_KERNEL);
195 if (client == NULL) {
196 fw_device_put(device);
197 return -ENOMEM;
198 }
199
200 client->device = device;
201 spin_lock_init(&client->lock);
202 idr_init(&client->resource_idr);
203 INIT_LIST_HEAD(&client->event_list);
204 init_waitqueue_head(&client->wait);
205 kref_init(&client->kref);
206
207 file->private_data = client;
208
209 mutex_lock(&device->client_list_mutex);
210 list_add_tail(&client->link, &device->client_list);
211 mutex_unlock(&device->client_list_mutex);
212
213 return 0;
214}
215
216static void queue_event(struct client *client, struct event *event,
217 void *data0, size_t size0, void *data1, size_t size1)
218{
219 unsigned long flags;
220
221 event->v[0].data = data0;
222 event->v[0].size = size0;
223 event->v[1].data = data1;
224 event->v[1].size = size1;
225
226 spin_lock_irqsave(&client->lock, flags);
227 if (client->in_shutdown)
228 kfree(event);
229 else
230 list_add_tail(&event->link, &client->event_list);
231 spin_unlock_irqrestore(&client->lock, flags);
232
233 wake_up_interruptible(&client->wait);
234}
235
236static int dequeue_event(struct client *client,
237 char __user *buffer, size_t count)
238{
239 struct event *event;
240 size_t size, total;
241 int i, ret;
242
243 ret = wait_event_interruptible(client->wait,
244 !list_empty(&client->event_list) ||
245 fw_device_is_shutdown(client->device));
246 if (ret < 0)
247 return ret;
248
249 if (list_empty(&client->event_list) &&
250 fw_device_is_shutdown(client->device))
251 return -ENODEV;
252
253 spin_lock_irq(&client->lock);
254 event = list_first_entry(&client->event_list, struct event, link);
255 list_del(&event->link);
256 spin_unlock_irq(&client->lock);
257
258 total = 0;
259 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
260 size = min(event->v[i].size, count - total);
261 if (copy_to_user(buffer + total, event->v[i].data, size)) {
262 ret = -EFAULT;
263 goto out;
264 }
265 total += size;
266 }
267 ret = total;
268
269 out:
270 kfree(event);
271
272 return ret;
273}
274
275static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
276 size_t count, loff_t *offset)
277{
278 struct client *client = file->private_data;
279
280 return dequeue_event(client, buffer, count);
281}
282
283static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
284 struct client *client)
285{
286 struct fw_card *card = client->device->card;
287
288 spin_lock_irq(&card->lock);
289
290 event->closure = client->bus_reset_closure;
291 event->type = FW_CDEV_EVENT_BUS_RESET;
292 event->generation = client->device->generation;
293 event->node_id = client->device->node_id;
294 event->local_node_id = card->local_node->node_id;
295 event->bm_node_id = 0; /* FIXME: We don't track the BM. */
296 event->irm_node_id = card->irm_node->node_id;
297 event->root_node_id = card->root_node->node_id;
298
299 spin_unlock_irq(&card->lock);
300}
301
302static void for_each_client(struct fw_device *device,
303 void (*callback)(struct client *client))
304{
305 struct client *c;
306
307 mutex_lock(&device->client_list_mutex);
308 list_for_each_entry(c, &device->client_list, link)
309 callback(c);
310 mutex_unlock(&device->client_list_mutex);
311}
312
313static int schedule_reallocations(int id, void *p, void *data)
314{
315 struct client_resource *r = p;
316
317 if (r->release == release_iso_resource)
318 schedule_iso_resource(container_of(r,
319 struct iso_resource, resource));
320 return 0;
321}
322
323static void queue_bus_reset_event(struct client *client)
324{
325 struct bus_reset_event *e;
326
327 e = kzalloc(sizeof(*e), GFP_KERNEL);
328 if (e == NULL) {
329 fw_notify("Out of memory when allocating bus reset event\n");
330 return;
331 }
332
333 fill_bus_reset_event(&e->reset, client);
334
335 queue_event(client, &e->event,
336 &e->reset, sizeof(e->reset), NULL, 0);
337
338 spin_lock_irq(&client->lock);
339 idr_for_each(&client->resource_idr, schedule_reallocations, client);
340 spin_unlock_irq(&client->lock);
341}
342
343void fw_device_cdev_update(struct fw_device *device)
344{
345 for_each_client(device, queue_bus_reset_event);
346}
347
348static void wake_up_client(struct client *client)
349{
350 wake_up_interruptible(&client->wait);
351}
352
353void fw_device_cdev_remove(struct fw_device *device)
354{
355 for_each_client(device, wake_up_client);
356}
357
358static int ioctl_get_info(struct client *client, void *buffer)
359{
360 struct fw_cdev_get_info *get_info = buffer;
361 struct fw_cdev_event_bus_reset bus_reset;
362 unsigned long ret = 0;
363
364 client->version = get_info->version;
365 get_info->version = FW_CDEV_VERSION;
366 get_info->card = client->device->card->index;
367
368 down_read(&fw_device_rwsem);
369
370 if (get_info->rom != 0) {
371 void __user *uptr = u64_to_uptr(get_info->rom);
372 size_t want = get_info->rom_length;
373 size_t have = client->device->config_rom_length * 4;
374
375 ret = copy_to_user(uptr, client->device->config_rom,
376 min(want, have));
377 }
378 get_info->rom_length = client->device->config_rom_length * 4;
379
380 up_read(&fw_device_rwsem);
381
382 if (ret != 0)
383 return -EFAULT;
384
385 client->bus_reset_closure = get_info->bus_reset_closure;
386 if (get_info->bus_reset != 0) {
387 void __user *uptr = u64_to_uptr(get_info->bus_reset);
388
389 fill_bus_reset_event(&bus_reset, client);
390 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
391 return -EFAULT;
392 }
393
394 return 0;
395}
396
397static int add_client_resource(struct client *client,
398 struct client_resource *resource, gfp_t gfp_mask)
399{
400 unsigned long flags;
401 int ret;
402
403 retry:
404 if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
405 return -ENOMEM;
406
407 spin_lock_irqsave(&client->lock, flags);
408 if (client->in_shutdown)
409 ret = -ECANCELED;
410 else
411 ret = idr_get_new(&client->resource_idr, resource,
412 &resource->handle);
413 if (ret >= 0) {
414 client_get(client);
415 if (resource->release == release_iso_resource)
416 schedule_iso_resource(container_of(resource,
417 struct iso_resource, resource));
418 }
419 spin_unlock_irqrestore(&client->lock, flags);
420
421 if (ret == -EAGAIN)
422 goto retry;
423
424 return ret < 0 ? ret : 0;
425}
426
427static int release_client_resource(struct client *client, u32 handle,
428 client_resource_release_fn_t release,
429 struct client_resource **resource)
430{
431 struct client_resource *r;
432
433 spin_lock_irq(&client->lock);
434 if (client->in_shutdown)
435 r = NULL;
436 else
437 r = idr_find(&client->resource_idr, handle);
438 if (r && r->release == release)
439 idr_remove(&client->resource_idr, handle);
440 spin_unlock_irq(&client->lock);
441
442 if (!(r && r->release == release))
443 return -EINVAL;
444
445 if (resource)
446 *resource = r;
447 else
448 r->release(client, r);
449
450 client_put(client);
451
452 return 0;
453}
454
455static void release_transaction(struct client *client,
456 struct client_resource *resource)
457{
458 struct outbound_transaction_resource *r = container_of(resource,
459 struct outbound_transaction_resource, resource);
460
461 fw_cancel_transaction(client->device->card, &r->transaction);
462}
463
464static void complete_transaction(struct fw_card *card, int rcode,
465 void *payload, size_t length, void *data)
466{
467 struct outbound_transaction_event *e = data;
468 struct fw_cdev_event_response *rsp = &e->response;
469 struct client *client = e->client;
470 unsigned long flags;
471
472 if (length < rsp->length)
473 rsp->length = length;
474 if (rcode == RCODE_COMPLETE)
475 memcpy(rsp->data, payload, rsp->length);
476
477 spin_lock_irqsave(&client->lock, flags);
478 /*
479 * 1. If called while in shutdown, the idr tree must be left untouched.
480 * The idr handle will be removed and the client reference will be
481 * dropped later.
482 * 2. If the call chain was release_client_resource ->
483 * release_transaction -> complete_transaction (instead of a normal
484 * conclusion of the transaction), i.e. if this resource was already
485 * unregistered from the idr, the client reference will be dropped
486 * by release_client_resource and we must not drop it here.
487 */
488 if (!client->in_shutdown &&
489 idr_find(&client->resource_idr, e->r.resource.handle)) {
490 idr_remove(&client->resource_idr, e->r.resource.handle);
491 /* Drop the idr's reference */
492 client_put(client);
493 }
494 spin_unlock_irqrestore(&client->lock, flags);
495
496 rsp->type = FW_CDEV_EVENT_RESPONSE;
497 rsp->rcode = rcode;
498
499 /*
500 * In the case that sizeof(*rsp) doesn't align with the position of the
501 * data, and the read is short, preserve an extra copy of the data
502 * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless
503 * for short reads and some apps depended on it, this is both safe
504 * and prudent for compatibility.
505 */
506 if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
507 queue_event(client, &e->event, rsp, sizeof(*rsp),
508 rsp->data, rsp->length);
509 else
510 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
511 NULL, 0);
512
513 /* Drop the transaction callback's reference */
514 client_put(client);
515}
516
517static int init_request(struct client *client,
518 struct fw_cdev_send_request *request,
519 int destination_id, int speed)
520{
521 struct outbound_transaction_event *e;
522 int ret;
523
524 if (request->tcode != TCODE_STREAM_DATA &&
525 (request->length > 4096 || request->length > 512 << speed))
526 return -EIO;
527
528 e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
529 if (e == NULL)
530 return -ENOMEM;
531
532 e->client = client;
533 e->response.length = request->length;
534 e->response.closure = request->closure;
535
536 if (request->data &&
537 copy_from_user(e->response.data,
538 u64_to_uptr(request->data), request->length)) {
539 ret = -EFAULT;
540 goto failed;
541 }
542
543 e->r.resource.release = release_transaction;
544 ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
545 if (ret < 0)
546 goto failed;
547
548 /* Get a reference for the transaction callback */
549 client_get(client);
550
551 fw_send_request(client->device->card, &e->r.transaction,
552 request->tcode, destination_id, request->generation,
553 speed, request->offset, e->response.data,
554 request->length, complete_transaction, e);
555 return 0;
556
557 failed:
558 kfree(e);
559
560 return ret;
561}
562
563static int ioctl_send_request(struct client *client, void *buffer)
564{
565 struct fw_cdev_send_request *request = buffer;
566
567 switch (request->tcode) {
568 case TCODE_WRITE_QUADLET_REQUEST:
569 case TCODE_WRITE_BLOCK_REQUEST:
570 case TCODE_READ_QUADLET_REQUEST:
571 case TCODE_READ_BLOCK_REQUEST:
572 case TCODE_LOCK_MASK_SWAP:
573 case TCODE_LOCK_COMPARE_SWAP:
574 case TCODE_LOCK_FETCH_ADD:
575 case TCODE_LOCK_LITTLE_ADD:
576 case TCODE_LOCK_BOUNDED_ADD:
577 case TCODE_LOCK_WRAP_ADD:
578 case TCODE_LOCK_VENDOR_DEPENDENT:
579 break;
580 default:
581 return -EINVAL;
582 }
583
584 return init_request(client, request, client->device->node_id,
585 client->device->max_speed);
586}
587
588static void release_request(struct client *client,
589 struct client_resource *resource)
590{
591 struct inbound_transaction_resource *r = container_of(resource,
592 struct inbound_transaction_resource, resource);
593
594 fw_send_response(client->device->card, r->request,
595 RCODE_CONFLICT_ERROR);
596 kfree(r);
597}
598
599static void handle_request(struct fw_card *card, struct fw_request *request,
600 int tcode, int destination, int source,
601 int generation, int speed,
602 unsigned long long offset,
603 void *payload, size_t length, void *callback_data)
604{
605 struct address_handler_resource *handler = callback_data;
606 struct inbound_transaction_resource *r;
607 struct inbound_transaction_event *e;
608 int ret;
609
610 r = kmalloc(sizeof(*r), GFP_ATOMIC);
611 e = kmalloc(sizeof(*e), GFP_ATOMIC);
612 if (r == NULL || e == NULL)
613 goto failed;
614
615 r->request = request;
616 r->data = payload;
617 r->length = length;
618
619 r->resource.release = release_request;
620 ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
621 if (ret < 0)
622 goto failed;
623
624 e->request.type = FW_CDEV_EVENT_REQUEST;
625 e->request.tcode = tcode;
626 e->request.offset = offset;
627 e->request.length = length;
628 e->request.handle = r->resource.handle;
629 e->request.closure = handler->closure;
630
631 queue_event(handler->client, &e->event,
632 &e->request, sizeof(e->request), payload, length);
633 return;
634
635 failed:
636 kfree(r);
637 kfree(e);
638 fw_send_response(card, request, RCODE_CONFLICT_ERROR);
639}
640
641static void release_address_handler(struct client *client,
642 struct client_resource *resource)
643{
644 struct address_handler_resource *r =
645 container_of(resource, struct address_handler_resource, resource);
646
647 fw_core_remove_address_handler(&r->handler);
648 kfree(r);
649}
650
651static int ioctl_allocate(struct client *client, void *buffer)
652{
653 struct fw_cdev_allocate *request = buffer;
654 struct address_handler_resource *r;
655 struct fw_address_region region;
656 int ret;
657
658 r = kmalloc(sizeof(*r), GFP_KERNEL);
659 if (r == NULL)
660 return -ENOMEM;
661
662 region.start = request->offset;
663 region.end = request->offset + request->length;
664 r->handler.length = request->length;
665 r->handler.address_callback = handle_request;
666 r->handler.callback_data = r;
667 r->closure = request->closure;
668 r->client = client;
669
670 ret = fw_core_add_address_handler(&r->handler, &region);
671 if (ret < 0) {
672 kfree(r);
673 return ret;
674 }
675
676 r->resource.release = release_address_handler;
677 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
678 if (ret < 0) {
679 release_address_handler(client, &r->resource);
680 return ret;
681 }
682 request->handle = r->resource.handle;
683
684 return 0;
685}
686
687static int ioctl_deallocate(struct client *client, void *buffer)
688{
689 struct fw_cdev_deallocate *request = buffer;
690
691 return release_client_resource(client, request->handle,
692 release_address_handler, NULL);
693}
694
695static int ioctl_send_response(struct client *client, void *buffer)
696{
697 struct fw_cdev_send_response *request = buffer;
698 struct client_resource *resource;
699 struct inbound_transaction_resource *r;
700
701 if (release_client_resource(client, request->handle,
702 release_request, &resource) < 0)
703 return -EINVAL;
704
705 r = container_of(resource, struct inbound_transaction_resource,
706 resource);
707 if (request->length < r->length)
708 r->length = request->length;
709 if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
710 return -EFAULT;
711
712 fw_send_response(client->device->card, r->request, request->rcode);
713 kfree(r);
714
715 return 0;
716}
717
718static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
719{
720 struct fw_cdev_initiate_bus_reset *request = buffer;
721 int short_reset;
722
723 short_reset = (request->type == FW_CDEV_SHORT_RESET);
724
725 return fw_core_initiate_bus_reset(client->device->card, short_reset);
726}
727
728static void release_descriptor(struct client *client,
729 struct client_resource *resource)
730{
731 struct descriptor_resource *r =
732 container_of(resource, struct descriptor_resource, resource);
733
734 fw_core_remove_descriptor(&r->descriptor);
735 kfree(r);
736}
737
738static int ioctl_add_descriptor(struct client *client, void *buffer)
739{
740 struct fw_cdev_add_descriptor *request = buffer;
741 struct descriptor_resource *r;
742 int ret;
743
744 /* Access policy: Allow this ioctl only on local nodes' device files. */
745 if (!client->device->is_local)
746 return -ENOSYS;
747
748 if (request->length > 256)
749 return -EINVAL;
750
751 r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
752 if (r == NULL)
753 return -ENOMEM;
754
755 if (copy_from_user(r->data,
756 u64_to_uptr(request->data), request->length * 4)) {
757 ret = -EFAULT;
758 goto failed;
759 }
760
761 r->descriptor.length = request->length;
762 r->descriptor.immediate = request->immediate;
763 r->descriptor.key = request->key;
764 r->descriptor.data = r->data;
765
766 ret = fw_core_add_descriptor(&r->descriptor);
767 if (ret < 0)
768 goto failed;
769
770 r->resource.release = release_descriptor;
771 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
772 if (ret < 0) {
773 fw_core_remove_descriptor(&r->descriptor);
774 goto failed;
775 }
776 request->handle = r->resource.handle;
777
778 return 0;
779 failed:
780 kfree(r);
781
782 return ret;
783}
784
785static int ioctl_remove_descriptor(struct client *client, void *buffer)
786{
787 struct fw_cdev_remove_descriptor *request = buffer;
788
789 return release_client_resource(client, request->handle,
790 release_descriptor, NULL);
791}
792
793static void iso_callback(struct fw_iso_context *context, u32 cycle,
794 size_t header_length, void *header, void *data)
795{
796 struct client *client = data;
797 struct iso_interrupt_event *e;
798
799 e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
800 if (e == NULL)
801 return;
802
803 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
804 e->interrupt.closure = client->iso_closure;
805 e->interrupt.cycle = cycle;
806 e->interrupt.header_length = header_length;
807 memcpy(e->interrupt.header, header, header_length);
808 queue_event(client, &e->event, &e->interrupt,
809 sizeof(e->interrupt) + header_length, NULL, 0);
810}
811
812static int ioctl_create_iso_context(struct client *client, void *buffer)
813{
814 struct fw_cdev_create_iso_context *request = buffer;
815 struct fw_iso_context *context;
816
817 /* We only support one context at this time. */
818 if (client->iso_context != NULL)
819 return -EBUSY;
820
821 if (request->channel > 63)
822 return -EINVAL;
823
824 switch (request->type) {
825 case FW_ISO_CONTEXT_RECEIVE:
826 if (request->header_size < 4 || (request->header_size & 3))
827 return -EINVAL;
828
829 break;
830
831 case FW_ISO_CONTEXT_TRANSMIT:
832 if (request->speed > SCODE_3200)
833 return -EINVAL;
834
835 break;
836
837 default:
838 return -EINVAL;
839 }
840
841 context = fw_iso_context_create(client->device->card,
842 request->type,
843 request->channel,
844 request->speed,
845 request->header_size,
846 iso_callback, client);
847 if (IS_ERR(context))
848 return PTR_ERR(context);
849
850 client->iso_closure = request->closure;
851 client->iso_context = context;
852
853 /* We only support one context at this time. */
854 request->handle = 0;
855
856 return 0;
857}
858
859/* Macros for decoding the iso packet control header. */
860#define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff)
861#define GET_INTERRUPT(v) (((v) >> 16) & 0x01)
862#define GET_SKIP(v) (((v) >> 17) & 0x01)
863#define GET_TAG(v) (((v) >> 18) & 0x03)
864#define GET_SY(v) (((v) >> 20) & 0x0f)
865#define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff)
866
867static int ioctl_queue_iso(struct client *client, void *buffer)
868{
869 struct fw_cdev_queue_iso *request = buffer;
870 struct fw_cdev_iso_packet __user *p, *end, *next;
871 struct fw_iso_context *ctx = client->iso_context;
872 unsigned long payload, buffer_end, header_length;
873 u32 control;
874 int count;
875 struct {
876 struct fw_iso_packet packet;
877 u8 header[256];
878 } u;
879
880 if (ctx == NULL || request->handle != 0)
881 return -EINVAL;
882
883 /*
884 * If the user passes a non-NULL data pointer, has mmap()'ed
885 * the iso buffer, and the pointer points inside the buffer,
886 * we setup the payload pointers accordingly. Otherwise we
887 * set them both to 0, which will still let packets with
888 * payload_length == 0 through. In other words, if no packets
889 * use the indirect payload, the iso buffer need not be mapped
890 * and the request->data pointer is ignored.
891 */
892
893 payload = (unsigned long)request->data - client->vm_start;
894 buffer_end = client->buffer.page_count << PAGE_SHIFT;
895 if (request->data == 0 || client->buffer.pages == NULL ||
896 payload >= buffer_end) {
897 payload = 0;
898 buffer_end = 0;
899 }
900
901 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
902
903 if (!access_ok(VERIFY_READ, p, request->size))
904 return -EFAULT;
905
906 end = (void __user *)p + request->size;
907 count = 0;
908 while (p < end) {
909 if (get_user(control, &p->control))
910 return -EFAULT;
911 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
912 u.packet.interrupt = GET_INTERRUPT(control);
913 u.packet.skip = GET_SKIP(control);
914 u.packet.tag = GET_TAG(control);
915 u.packet.sy = GET_SY(control);
916 u.packet.header_length = GET_HEADER_LENGTH(control);
917
918 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
919 header_length = u.packet.header_length;
920 } else {
921 /*
922 * We require that header_length is a multiple of
923 * the fixed header size, ctx->header_size.
924 */
925 if (ctx->header_size == 0) {
926 if (u.packet.header_length > 0)
927 return -EINVAL;
928 } else if (u.packet.header_length % ctx->header_size != 0) {
929 return -EINVAL;
930 }
931 header_length = 0;
932 }
933
934 next = (struct fw_cdev_iso_packet __user *)
935 &p->header[header_length / 4];
936 if (next > end)
937 return -EINVAL;
938 if (__copy_from_user
939 (u.packet.header, p->header, header_length))
940 return -EFAULT;
941 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
942 u.packet.header_length + u.packet.payload_length > 0)
943 return -EINVAL;
944 if (payload + u.packet.payload_length > buffer_end)
945 return -EINVAL;
946
947 if (fw_iso_context_queue(ctx, &u.packet,
948 &client->buffer, payload))
949 break;
950
951 p = next;
952 payload += u.packet.payload_length;
953 count++;
954 }
955
956 request->size -= uptr_to_u64(p) - request->packets;
957 request->packets = uptr_to_u64(p);
958 request->data = client->vm_start + payload;
959
960 return count;
961}
962
963static int ioctl_start_iso(struct client *client, void *buffer)
964{
965 struct fw_cdev_start_iso *request = buffer;
966
967 if (client->iso_context == NULL || request->handle != 0)
968 return -EINVAL;
969
970 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
971 if (request->tags == 0 || request->tags > 15)
972 return -EINVAL;
973
974 if (request->sync > 15)
975 return -EINVAL;
976 }
977
978 return fw_iso_context_start(client->iso_context, request->cycle,
979 request->sync, request->tags);
980}
981
982static int ioctl_stop_iso(struct client *client, void *buffer)
983{
984 struct fw_cdev_stop_iso *request = buffer;
985
986 if (client->iso_context == NULL || request->handle != 0)
987 return -EINVAL;
988
989 return fw_iso_context_stop(client->iso_context);
990}
991
992static int ioctl_get_cycle_timer(struct client *client, void *buffer)
993{
994 struct fw_cdev_get_cycle_timer *request = buffer;
995 struct fw_card *card = client->device->card;
996 unsigned long long bus_time;
997 struct timeval tv;
998 unsigned long flags;
999
1000 preempt_disable();
1001 local_irq_save(flags);
1002
1003 bus_time = card->driver->get_bus_time(card);
1004 do_gettimeofday(&tv);
1005
1006 local_irq_restore(flags);
1007 preempt_enable();
1008
1009 request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1010 request->cycle_timer = bus_time & 0xffffffff;
1011 return 0;
1012}
1013
1014static void iso_resource_work(struct work_struct *work)
1015{
1016 struct iso_resource_event *e;
1017 struct iso_resource *r =
1018 container_of(work, struct iso_resource, work.work);
1019 struct client *client = r->client;
1020 int generation, channel, bandwidth, todo;
1021 bool skip, free, success;
1022
1023 spin_lock_irq(&client->lock);
1024 generation = client->device->generation;
1025 todo = r->todo;
1026 /* Allow 1000ms grace period for other reallocations. */
1027 if (todo == ISO_RES_ALLOC &&
1028 time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1029 if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
1030 client_get(client);
1031 skip = true;
1032 } else {
1033 /* We could be called twice within the same generation. */
1034 skip = todo == ISO_RES_REALLOC &&
1035 r->generation == generation;
1036 }
1037 free = todo == ISO_RES_DEALLOC ||
1038 todo == ISO_RES_ALLOC_ONCE ||
1039 todo == ISO_RES_DEALLOC_ONCE;
1040 r->generation = generation;
1041 spin_unlock_irq(&client->lock);
1042
1043 if (skip)
1044 goto out;
1045
1046 bandwidth = r->bandwidth;
1047
1048 fw_iso_resource_manage(client->device->card, generation,
1049 r->channels, &channel, &bandwidth,
1050 todo == ISO_RES_ALLOC ||
1051 todo == ISO_RES_REALLOC ||
1052 todo == ISO_RES_ALLOC_ONCE);
1053 /*
1054 * Is this generation outdated already? As long as this resource sticks
1055 * in the idr, it will be scheduled again for a newer generation or at
1056 * shutdown.
1057 */
1058 if (channel == -EAGAIN &&
1059 (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1060 goto out;
1061
1062 success = channel >= 0 || bandwidth > 0;
1063
1064 spin_lock_irq(&client->lock);
1065 /*
1066 * Transit from allocation to reallocation, except if the client
1067 * requested deallocation in the meantime.
1068 */
1069 if (r->todo == ISO_RES_ALLOC)
1070 r->todo = ISO_RES_REALLOC;
1071 /*
1072 * Allocation or reallocation failure? Pull this resource out of the
1073 * idr and prepare for deletion, unless the client is shutting down.
1074 */
1075 if (r->todo == ISO_RES_REALLOC && !success &&
1076 !client->in_shutdown &&
1077 idr_find(&client->resource_idr, r->resource.handle)) {
1078 idr_remove(&client->resource_idr, r->resource.handle);
1079 client_put(client);
1080 free = true;
1081 }
1082 spin_unlock_irq(&client->lock);
1083
1084 if (todo == ISO_RES_ALLOC && channel >= 0)
1085 r->channels = 1ULL << channel;
1086
1087 if (todo == ISO_RES_REALLOC && success)
1088 goto out;
1089
1090 if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1091 e = r->e_alloc;
1092 r->e_alloc = NULL;
1093 } else {
1094 e = r->e_dealloc;
1095 r->e_dealloc = NULL;
1096 }
1097 e->resource.handle = r->resource.handle;
1098 e->resource.channel = channel;
1099 e->resource.bandwidth = bandwidth;
1100
1101 queue_event(client, &e->event,
1102 &e->resource, sizeof(e->resource), NULL, 0);
1103
1104 if (free) {
1105 cancel_delayed_work(&r->work);
1106 kfree(r->e_alloc);
1107 kfree(r->e_dealloc);
1108 kfree(r);
1109 }
1110 out:
1111 client_put(client);
1112}
1113
1114static void schedule_iso_resource(struct iso_resource *r)
1115{
1116 client_get(r->client);
1117 if (!schedule_delayed_work(&r->work, 0))
1118 client_put(r->client);
1119}
1120
1121static void release_iso_resource(struct client *client,
1122 struct client_resource *resource)
1123{
1124 struct iso_resource *r =
1125 container_of(resource, struct iso_resource, resource);
1126
1127 spin_lock_irq(&client->lock);
1128 r->todo = ISO_RES_DEALLOC;
1129 schedule_iso_resource(r);
1130 spin_unlock_irq(&client->lock);
1131}
1132
1133static int init_iso_resource(struct client *client,
1134 struct fw_cdev_allocate_iso_resource *request, int todo)
1135{
1136 struct iso_resource_event *e1, *e2;
1137 struct iso_resource *r;
1138 int ret;
1139
1140 if ((request->channels == 0 && request->bandwidth == 0) ||
1141 request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1142 request->bandwidth < 0)
1143 return -EINVAL;
1144
1145 r = kmalloc(sizeof(*r), GFP_KERNEL);
1146 e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1147 e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1148 if (r == NULL || e1 == NULL || e2 == NULL) {
1149 ret = -ENOMEM;
1150 goto fail;
1151 }
1152
1153 INIT_DELAYED_WORK(&r->work, iso_resource_work);
1154 r->client = client;
1155 r->todo = todo;
1156 r->generation = -1;
1157 r->channels = request->channels;
1158 r->bandwidth = request->bandwidth;
1159 r->e_alloc = e1;
1160 r->e_dealloc = e2;
1161
1162 e1->resource.closure = request->closure;
1163 e1->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1164 e2->resource.closure = request->closure;
1165 e2->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1166
1167 if (todo == ISO_RES_ALLOC) {
1168 r->resource.release = release_iso_resource;
1169 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1170 if (ret < 0)
1171 goto fail;
1172 } else {
1173 r->resource.release = NULL;
1174 r->resource.handle = -1;
1175 schedule_iso_resource(r);
1176 }
1177 request->handle = r->resource.handle;
1178
1179 return 0;
1180 fail:
1181 kfree(r);
1182 kfree(e1);
1183 kfree(e2);
1184
1185 return ret;
1186}
1187
1188static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1189{
1190 struct fw_cdev_allocate_iso_resource *request = buffer;
1191
1192 return init_iso_resource(client, request, ISO_RES_ALLOC);
1193}
1194
1195static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1196{
1197 struct fw_cdev_deallocate *request = buffer;
1198
1199 return release_client_resource(client, request->handle,
1200 release_iso_resource, NULL);
1201}
1202
1203static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1204{
1205 struct fw_cdev_allocate_iso_resource *request = buffer;
1206
1207 return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1208}
1209
1210static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1211{
1212 struct fw_cdev_allocate_iso_resource *request = buffer;
1213
1214 return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1215}
1216
1217/*
1218 * Returns a speed code: Maximum speed to or from this device,
1219 * limited by the device's link speed, the local node's link speed,
1220 * and all PHY port speeds between the two links.
1221 */
1222static int ioctl_get_speed(struct client *client, void *buffer)
1223{
1224 return client->device->max_speed;
1225}
1226
1227static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1228{
1229 struct fw_cdev_send_request *request = buffer;
1230
1231 switch (request->tcode) {
1232 case TCODE_WRITE_QUADLET_REQUEST:
1233 case TCODE_WRITE_BLOCK_REQUEST:
1234 break;
1235 default:
1236 return -EINVAL;
1237 }
1238
1239 /* Security policy: Only allow accesses to Units Space. */
1240 if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1241 return -EACCES;
1242
1243 return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1244}
1245
1246static int ioctl_send_stream_packet(struct client *client, void *buffer)
1247{
1248 struct fw_cdev_send_stream_packet *p = buffer;
1249 struct fw_cdev_send_request request;
1250 int dest;
1251
1252 if (p->speed > client->device->card->link_speed ||
1253 p->length > 1024 << p->speed)
1254 return -EIO;
1255
1256 if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1257 return -EINVAL;
1258
1259 dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1260 request.tcode = TCODE_STREAM_DATA;
1261 request.length = p->length;
1262 request.closure = p->closure;
1263 request.data = p->data;
1264 request.generation = p->generation;
1265
1266 return init_request(client, &request, dest, p->speed);
1267}
1268
1269static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1270 ioctl_get_info,
1271 ioctl_send_request,
1272 ioctl_allocate,
1273 ioctl_deallocate,
1274 ioctl_send_response,
1275 ioctl_initiate_bus_reset,
1276 ioctl_add_descriptor,
1277 ioctl_remove_descriptor,
1278 ioctl_create_iso_context,
1279 ioctl_queue_iso,
1280 ioctl_start_iso,
1281 ioctl_stop_iso,
1282 ioctl_get_cycle_timer,
1283 ioctl_allocate_iso_resource,
1284 ioctl_deallocate_iso_resource,
1285 ioctl_allocate_iso_resource_once,
1286 ioctl_deallocate_iso_resource_once,
1287 ioctl_get_speed,
1288 ioctl_send_broadcast_request,
1289 ioctl_send_stream_packet,
1290};
1291
1292static int dispatch_ioctl(struct client *client,
1293 unsigned int cmd, void __user *arg)
1294{
1295 char buffer[256];
1296 int ret;
1297
1298 if (_IOC_TYPE(cmd) != '#' ||
1299 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1300 return -EINVAL;
1301
1302 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1303 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1304 copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1305 return -EFAULT;
1306 }
1307
1308 ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1309 if (ret < 0)
1310 return ret;
1311
1312 if (_IOC_DIR(cmd) & _IOC_READ) {
1313 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1314 copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1315 return -EFAULT;
1316 }
1317
1318 return ret;
1319}
1320
1321static long fw_device_op_ioctl(struct file *file,
1322 unsigned int cmd, unsigned long arg)
1323{
1324 struct client *client = file->private_data;
1325
1326 if (fw_device_is_shutdown(client->device))
1327 return -ENODEV;
1328
1329 return dispatch_ioctl(client, cmd, (void __user *) arg);
1330}
1331
1332#ifdef CONFIG_COMPAT
1333static long fw_device_op_compat_ioctl(struct file *file,
1334 unsigned int cmd, unsigned long arg)
1335{
1336 struct client *client = file->private_data;
1337
1338 if (fw_device_is_shutdown(client->device))
1339 return -ENODEV;
1340
1341 return dispatch_ioctl(client, cmd, compat_ptr(arg));
1342}
1343#endif
1344
1345static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1346{
1347 struct client *client = file->private_data;
1348 enum dma_data_direction direction;
1349 unsigned long size;
1350 int page_count, ret;
1351
1352 if (fw_device_is_shutdown(client->device))
1353 return -ENODEV;
1354
1355 /* FIXME: We could support multiple buffers, but we don't. */
1356 if (client->buffer.pages != NULL)
1357 return -EBUSY;
1358
1359 if (!(vma->vm_flags & VM_SHARED))
1360 return -EINVAL;
1361
1362 if (vma->vm_start & ~PAGE_MASK)
1363 return -EINVAL;
1364
1365 client->vm_start = vma->vm_start;
1366 size = vma->vm_end - vma->vm_start;
1367 page_count = size >> PAGE_SHIFT;
1368 if (size & ~PAGE_MASK)
1369 return -EINVAL;
1370
1371 if (vma->vm_flags & VM_WRITE)
1372 direction = DMA_TO_DEVICE;
1373 else
1374 direction = DMA_FROM_DEVICE;
1375
1376 ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1377 page_count, direction);
1378 if (ret < 0)
1379 return ret;
1380
1381 ret = fw_iso_buffer_map(&client->buffer, vma);
1382 if (ret < 0)
1383 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1384
1385 return ret;
1386}
1387
1388static int shutdown_resource(int id, void *p, void *data)
1389{
1390 struct client_resource *r = p;
1391 struct client *client = data;
1392
1393 r->release(client, r);
1394 client_put(client);
1395
1396 return 0;
1397}
1398
1399static int fw_device_op_release(struct inode *inode, struct file *file)
1400{
1401 struct client *client = file->private_data;
1402 struct event *e, *next_e;
1403
1404 mutex_lock(&client->device->client_list_mutex);
1405 list_del(&client->link);
1406 mutex_unlock(&client->device->client_list_mutex);
1407
1408 if (client->iso_context)
1409 fw_iso_context_destroy(client->iso_context);
1410
1411 if (client->buffer.pages)
1412 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1413
1414 /* Freeze client->resource_idr and client->event_list */
1415 spin_lock_irq(&client->lock);
1416 client->in_shutdown = true;
1417 spin_unlock_irq(&client->lock);
1418
1419 idr_for_each(&client->resource_idr, shutdown_resource, client);
1420 idr_remove_all(&client->resource_idr);
1421 idr_destroy(&client->resource_idr);
1422
1423 list_for_each_entry_safe(e, next_e, &client->event_list, link)
1424 kfree(e);
1425
1426 client_put(client);
1427
1428 return 0;
1429}
1430
1431static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1432{
1433 struct client *client = file->private_data;
1434 unsigned int mask = 0;
1435
1436 poll_wait(file, &client->wait, pt);
1437
1438 if (fw_device_is_shutdown(client->device))
1439 mask |= POLLHUP | POLLERR;
1440 if (!list_empty(&client->event_list))
1441 mask |= POLLIN | POLLRDNORM;
1442
1443 return mask;
1444}
1445
1446const struct file_operations fw_device_ops = {
1447 .owner = THIS_MODULE,
1448 .open = fw_device_op_open,
1449 .read = fw_device_op_read,
1450 .unlocked_ioctl = fw_device_op_ioctl,
1451 .poll = fw_device_op_poll,
1452 .release = fw_device_op_release,
1453 .mmap = fw_device_op_mmap,
1454
1455#ifdef CONFIG_COMPAT
1456 .compat_ioctl = fw_device_op_compat_ioctl,
1457#endif
1458};
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-02 19:00:18 -0500