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