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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Char device for device raw access
4 *
5 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
6 */
7
8#include <linux/bug.h>
9#include <linux/compat.h>
10#include <linux/delay.h>
11#include <linux/device.h>
12#include <linux/dma-mapping.h>
13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/firewire.h>
16#include <linux/firewire-cdev.h>
17#include <linux/idr.h>
18#include <linux/irqflags.h>
19#include <linux/jiffies.h>
20#include <linux/kernel.h>
21#include <linux/kref.h>
22#include <linux/mm.h>
23#include <linux/module.h>
24#include <linux/mutex.h>
25#include <linux/poll.h>
26#include <linux/sched.h> /* required for linux/wait.h */
27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <linux/string.h>
30#include <linux/time.h>
31#include <linux/uaccess.h>
32#include <linux/vmalloc.h>
33#include <linux/wait.h>
34#include <linux/workqueue.h>
35
36
37#include "core.h"
38
39/*
40 * ABI version history is documented in linux/firewire-cdev.h.
41 */
42#define FW_CDEV_KERNEL_VERSION 5
43#define FW_CDEV_VERSION_EVENT_REQUEST2 4
44#define FW_CDEV_VERSION_ALLOCATE_REGION_END 4
45#define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5
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 wait_queue_head_t tx_flush_wait;
57 u64 bus_reset_closure;
58
59 struct fw_iso_context *iso_context;
60 u64 iso_closure;
61 struct fw_iso_buffer buffer;
62 unsigned long vm_start;
63 bool buffer_is_mapped;
64
65 struct list_head phy_receiver_link;
66 u64 phy_receiver_closure;
67
68 struct list_head link;
69 struct kref kref;
70};
71
72static inline void client_get(struct client *client)
73{
74 kref_get(&client->kref);
75}
76
77static void client_release(struct kref *kref)
78{
79 struct client *client = container_of(kref, struct client, kref);
80
81 fw_device_put(client->device);
82 kfree(client);
83}
84
85static void client_put(struct client *client)
86{
87 kref_put(&client->kref, client_release);
88}
89
90struct client_resource;
91typedef void (*client_resource_release_fn_t)(struct client *,
92 struct client_resource *);
93struct client_resource {
94 client_resource_release_fn_t release;
95 int handle;
96};
97
98struct address_handler_resource {
99 struct client_resource resource;
100 struct fw_address_handler handler;
101 __u64 closure;
102 struct client *client;
103};
104
105struct outbound_transaction_resource {
106 struct client_resource resource;
107 struct fw_transaction transaction;
108};
109
110struct inbound_transaction_resource {
111 struct client_resource resource;
112 struct fw_card *card;
113 struct fw_request *request;
114 void *data;
115 size_t length;
116};
117
118struct descriptor_resource {
119 struct client_resource resource;
120 struct fw_descriptor descriptor;
121 u32 data[];
122};
123
124struct iso_resource {
125 struct client_resource resource;
126 struct client *client;
127 /* Schedule work and access todo only with client->lock held. */
128 struct delayed_work work;
129 enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
130 ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
131 int generation;
132 u64 channels;
133 s32 bandwidth;
134 struct iso_resource_event *e_alloc, *e_dealloc;
135};
136
137static void release_iso_resource(struct client *, struct client_resource *);
138
139static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
140{
141 client_get(r->client);
142 if (!queue_delayed_work(fw_workqueue, &r->work, delay))
143 client_put(r->client);
144}
145
146static void schedule_if_iso_resource(struct client_resource *resource)
147{
148 if (resource->release == release_iso_resource)
149 schedule_iso_resource(container_of(resource,
150 struct iso_resource, resource), 0);
151}
152
153/*
154 * dequeue_event() just kfree()'s the event, so the event has to be
155 * the first field in a struct XYZ_event.
156 */
157struct event {
158 struct { void *data; size_t size; } v[2];
159 struct list_head link;
160};
161
162struct bus_reset_event {
163 struct event event;
164 struct fw_cdev_event_bus_reset reset;
165};
166
167struct outbound_transaction_event {
168 struct event event;
169 struct client *client;
170 struct outbound_transaction_resource r;
171 struct fw_cdev_event_response response;
172};
173
174struct inbound_transaction_event {
175 struct event event;
176 union {
177 struct fw_cdev_event_request request;
178 struct fw_cdev_event_request2 request2;
179 } req;
180};
181
182struct iso_interrupt_event {
183 struct event event;
184 struct fw_cdev_event_iso_interrupt interrupt;
185};
186
187struct iso_interrupt_mc_event {
188 struct event event;
189 struct fw_cdev_event_iso_interrupt_mc interrupt;
190};
191
192struct iso_resource_event {
193 struct event event;
194 struct fw_cdev_event_iso_resource iso_resource;
195};
196
197struct outbound_phy_packet_event {
198 struct event event;
199 struct client *client;
200 struct fw_packet p;
201 struct fw_cdev_event_phy_packet phy_packet;
202};
203
204struct inbound_phy_packet_event {
205 struct event event;
206 struct fw_cdev_event_phy_packet phy_packet;
207};
208
209#ifdef CONFIG_COMPAT
210static void __user *u64_to_uptr(u64 value)
211{
212 if (in_compat_syscall())
213 return compat_ptr(value);
214 else
215 return (void __user *)(unsigned long)value;
216}
217
218static u64 uptr_to_u64(void __user *ptr)
219{
220 if (in_compat_syscall())
221 return ptr_to_compat(ptr);
222 else
223 return (u64)(unsigned long)ptr;
224}
225#else
226static inline void __user *u64_to_uptr(u64 value)
227{
228 return (void __user *)(unsigned long)value;
229}
230
231static inline u64 uptr_to_u64(void __user *ptr)
232{
233 return (u64)(unsigned long)ptr;
234}
235#endif /* CONFIG_COMPAT */
236
237static int fw_device_op_open(struct inode *inode, struct file *file)
238{
239 struct fw_device *device;
240 struct client *client;
241
242 device = fw_device_get_by_devt(inode->i_rdev);
243 if (device == NULL)
244 return -ENODEV;
245
246 if (fw_device_is_shutdown(device)) {
247 fw_device_put(device);
248 return -ENODEV;
249 }
250
251 client = kzalloc(sizeof(*client), GFP_KERNEL);
252 if (client == NULL) {
253 fw_device_put(device);
254 return -ENOMEM;
255 }
256
257 client->device = device;
258 spin_lock_init(&client->lock);
259 idr_init(&client->resource_idr);
260 INIT_LIST_HEAD(&client->event_list);
261 init_waitqueue_head(&client->wait);
262 init_waitqueue_head(&client->tx_flush_wait);
263 INIT_LIST_HEAD(&client->phy_receiver_link);
264 INIT_LIST_HEAD(&client->link);
265 kref_init(&client->kref);
266
267 file->private_data = client;
268
269 return nonseekable_open(inode, file);
270}
271
272static void queue_event(struct client *client, struct event *event,
273 void *data0, size_t size0, void *data1, size_t size1)
274{
275 unsigned long flags;
276
277 event->v[0].data = data0;
278 event->v[0].size = size0;
279 event->v[1].data = data1;
280 event->v[1].size = size1;
281
282 spin_lock_irqsave(&client->lock, flags);
283 if (client->in_shutdown)
284 kfree(event);
285 else
286 list_add_tail(&event->link, &client->event_list);
287 spin_unlock_irqrestore(&client->lock, flags);
288
289 wake_up_interruptible(&client->wait);
290}
291
292static int dequeue_event(struct client *client,
293 char __user *buffer, size_t count)
294{
295 struct event *event;
296 size_t size, total;
297 int i, ret;
298
299 ret = wait_event_interruptible(client->wait,
300 !list_empty(&client->event_list) ||
301 fw_device_is_shutdown(client->device));
302 if (ret < 0)
303 return ret;
304
305 if (list_empty(&client->event_list) &&
306 fw_device_is_shutdown(client->device))
307 return -ENODEV;
308
309 spin_lock_irq(&client->lock);
310 event = list_first_entry(&client->event_list, struct event, link);
311 list_del(&event->link);
312 spin_unlock_irq(&client->lock);
313
314 total = 0;
315 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
316 size = min(event->v[i].size, count - total);
317 if (copy_to_user(buffer + total, event->v[i].data, size)) {
318 ret = -EFAULT;
319 goto out;
320 }
321 total += size;
322 }
323 ret = total;
324
325 out:
326 kfree(event);
327
328 return ret;
329}
330
331static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
332 size_t count, loff_t *offset)
333{
334 struct client *client = file->private_data;
335
336 return dequeue_event(client, buffer, count);
337}
338
339static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
340 struct client *client)
341{
342 struct fw_card *card = client->device->card;
343
344 spin_lock_irq(&card->lock);
345
346 event->closure = client->bus_reset_closure;
347 event->type = FW_CDEV_EVENT_BUS_RESET;
348 event->generation = client->device->generation;
349 event->node_id = client->device->node_id;
350 event->local_node_id = card->local_node->node_id;
351 event->bm_node_id = card->bm_node_id;
352 event->irm_node_id = card->irm_node->node_id;
353 event->root_node_id = card->root_node->node_id;
354
355 spin_unlock_irq(&card->lock);
356}
357
358static void for_each_client(struct fw_device *device,
359 void (*callback)(struct client *client))
360{
361 struct client *c;
362
363 mutex_lock(&device->client_list_mutex);
364 list_for_each_entry(c, &device->client_list, link)
365 callback(c);
366 mutex_unlock(&device->client_list_mutex);
367}
368
369static int schedule_reallocations(int id, void *p, void *data)
370{
371 schedule_if_iso_resource(p);
372
373 return 0;
374}
375
376static void queue_bus_reset_event(struct client *client)
377{
378 struct bus_reset_event *e;
379
380 e = kzalloc(sizeof(*e), GFP_KERNEL);
381 if (e == NULL)
382 return;
383
384 fill_bus_reset_event(&e->reset, client);
385
386 queue_event(client, &e->event,
387 &e->reset, sizeof(e->reset), NULL, 0);
388
389 spin_lock_irq(&client->lock);
390 idr_for_each(&client->resource_idr, schedule_reallocations, client);
391 spin_unlock_irq(&client->lock);
392}
393
394void fw_device_cdev_update(struct fw_device *device)
395{
396 for_each_client(device, queue_bus_reset_event);
397}
398
399static void wake_up_client(struct client *client)
400{
401 wake_up_interruptible(&client->wait);
402}
403
404void fw_device_cdev_remove(struct fw_device *device)
405{
406 for_each_client(device, wake_up_client);
407}
408
409union ioctl_arg {
410 struct fw_cdev_get_info get_info;
411 struct fw_cdev_send_request send_request;
412 struct fw_cdev_allocate allocate;
413 struct fw_cdev_deallocate deallocate;
414 struct fw_cdev_send_response send_response;
415 struct fw_cdev_initiate_bus_reset initiate_bus_reset;
416 struct fw_cdev_add_descriptor add_descriptor;
417 struct fw_cdev_remove_descriptor remove_descriptor;
418 struct fw_cdev_create_iso_context create_iso_context;
419 struct fw_cdev_queue_iso queue_iso;
420 struct fw_cdev_start_iso start_iso;
421 struct fw_cdev_stop_iso stop_iso;
422 struct fw_cdev_get_cycle_timer get_cycle_timer;
423 struct fw_cdev_allocate_iso_resource allocate_iso_resource;
424 struct fw_cdev_send_stream_packet send_stream_packet;
425 struct fw_cdev_get_cycle_timer2 get_cycle_timer2;
426 struct fw_cdev_send_phy_packet send_phy_packet;
427 struct fw_cdev_receive_phy_packets receive_phy_packets;
428 struct fw_cdev_set_iso_channels set_iso_channels;
429 struct fw_cdev_flush_iso flush_iso;
430};
431
432static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
433{
434 struct fw_cdev_get_info *a = &arg->get_info;
435 struct fw_cdev_event_bus_reset bus_reset;
436 unsigned long ret = 0;
437
438 client->version = a->version;
439 a->version = FW_CDEV_KERNEL_VERSION;
440 a->card = client->device->card->index;
441
442 down_read(&fw_device_rwsem);
443
444 if (a->rom != 0) {
445 size_t want = a->rom_length;
446 size_t have = client->device->config_rom_length * 4;
447
448 ret = copy_to_user(u64_to_uptr(a->rom),
449 client->device->config_rom, min(want, have));
450 }
451 a->rom_length = client->device->config_rom_length * 4;
452
453 up_read(&fw_device_rwsem);
454
455 if (ret != 0)
456 return -EFAULT;
457
458 mutex_lock(&client->device->client_list_mutex);
459
460 client->bus_reset_closure = a->bus_reset_closure;
461 if (a->bus_reset != 0) {
462 fill_bus_reset_event(&bus_reset, client);
463 /* unaligned size of bus_reset is 36 bytes */
464 ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36);
465 }
466 if (ret == 0 && list_empty(&client->link))
467 list_add_tail(&client->link, &client->device->client_list);
468
469 mutex_unlock(&client->device->client_list_mutex);
470
471 return ret ? -EFAULT : 0;
472}
473
474static int add_client_resource(struct client *client,
475 struct client_resource *resource, gfp_t gfp_mask)
476{
477 bool preload = gfpflags_allow_blocking(gfp_mask);
478 unsigned long flags;
479 int ret;
480
481 if (preload)
482 idr_preload(gfp_mask);
483 spin_lock_irqsave(&client->lock, flags);
484
485 if (client->in_shutdown)
486 ret = -ECANCELED;
487 else
488 ret = idr_alloc(&client->resource_idr, resource, 0, 0,
489 GFP_NOWAIT);
490 if (ret >= 0) {
491 resource->handle = ret;
492 client_get(client);
493 schedule_if_iso_resource(resource);
494 }
495
496 spin_unlock_irqrestore(&client->lock, flags);
497 if (preload)
498 idr_preload_end();
499
500 return ret < 0 ? ret : 0;
501}
502
503static int release_client_resource(struct client *client, u32 handle,
504 client_resource_release_fn_t release,
505 struct client_resource **return_resource)
506{
507 struct client_resource *resource;
508
509 spin_lock_irq(&client->lock);
510 if (client->in_shutdown)
511 resource = NULL;
512 else
513 resource = idr_find(&client->resource_idr, handle);
514 if (resource && resource->release == release)
515 idr_remove(&client->resource_idr, handle);
516 spin_unlock_irq(&client->lock);
517
518 if (!(resource && resource->release == release))
519 return -EINVAL;
520
521 if (return_resource)
522 *return_resource = resource;
523 else
524 resource->release(client, resource);
525
526 client_put(client);
527
528 return 0;
529}
530
531static void release_transaction(struct client *client,
532 struct client_resource *resource)
533{
534}
535
536static void complete_transaction(struct fw_card *card, int rcode,
537 void *payload, size_t length, void *data)
538{
539 struct outbound_transaction_event *e = data;
540 struct fw_cdev_event_response *rsp = &e->response;
541 struct client *client = e->client;
542 unsigned long flags;
543
544 if (length < rsp->length)
545 rsp->length = length;
546 if (rcode == RCODE_COMPLETE)
547 memcpy(rsp->data, payload, rsp->length);
548
549 spin_lock_irqsave(&client->lock, flags);
550 idr_remove(&client->resource_idr, e->r.resource.handle);
551 if (client->in_shutdown)
552 wake_up(&client->tx_flush_wait);
553 spin_unlock_irqrestore(&client->lock, flags);
554
555 rsp->type = FW_CDEV_EVENT_RESPONSE;
556 rsp->rcode = rcode;
557
558 /*
559 * In the case that sizeof(*rsp) doesn't align with the position of the
560 * data, and the read is short, preserve an extra copy of the data
561 * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless
562 * for short reads and some apps depended on it, this is both safe
563 * and prudent for compatibility.
564 */
565 if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
566 queue_event(client, &e->event, rsp, sizeof(*rsp),
567 rsp->data, rsp->length);
568 else
569 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
570 NULL, 0);
571
572 /* Drop the idr's reference */
573 client_put(client);
574}
575
576static int init_request(struct client *client,
577 struct fw_cdev_send_request *request,
578 int destination_id, int speed)
579{
580 struct outbound_transaction_event *e;
581 int ret;
582
583 if (request->tcode != TCODE_STREAM_DATA &&
584 (request->length > 4096 || request->length > 512 << speed))
585 return -EIO;
586
587 if (request->tcode == TCODE_WRITE_QUADLET_REQUEST &&
588 request->length < 4)
589 return -EINVAL;
590
591 e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
592 if (e == NULL)
593 return -ENOMEM;
594
595 e->client = client;
596 e->response.length = request->length;
597 e->response.closure = request->closure;
598
599 if (request->data &&
600 copy_from_user(e->response.data,
601 u64_to_uptr(request->data), request->length)) {
602 ret = -EFAULT;
603 goto failed;
604 }
605
606 e->r.resource.release = release_transaction;
607 ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
608 if (ret < 0)
609 goto failed;
610
611 fw_send_request(client->device->card, &e->r.transaction,
612 request->tcode, destination_id, request->generation,
613 speed, request->offset, e->response.data,
614 request->length, complete_transaction, e);
615 return 0;
616
617 failed:
618 kfree(e);
619
620 return ret;
621}
622
623static int ioctl_send_request(struct client *client, union ioctl_arg *arg)
624{
625 switch (arg->send_request.tcode) {
626 case TCODE_WRITE_QUADLET_REQUEST:
627 case TCODE_WRITE_BLOCK_REQUEST:
628 case TCODE_READ_QUADLET_REQUEST:
629 case TCODE_READ_BLOCK_REQUEST:
630 case TCODE_LOCK_MASK_SWAP:
631 case TCODE_LOCK_COMPARE_SWAP:
632 case TCODE_LOCK_FETCH_ADD:
633 case TCODE_LOCK_LITTLE_ADD:
634 case TCODE_LOCK_BOUNDED_ADD:
635 case TCODE_LOCK_WRAP_ADD:
636 case TCODE_LOCK_VENDOR_DEPENDENT:
637 break;
638 default:
639 return -EINVAL;
640 }
641
642 return init_request(client, &arg->send_request, client->device->node_id,
643 client->device->max_speed);
644}
645
646static inline bool is_fcp_request(struct fw_request *request)
647{
648 return request == NULL;
649}
650
651static void release_request(struct client *client,
652 struct client_resource *resource)
653{
654 struct inbound_transaction_resource *r = container_of(resource,
655 struct inbound_transaction_resource, resource);
656
657 if (is_fcp_request(r->request))
658 kfree(r->data);
659 else
660 fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR);
661
662 fw_card_put(r->card);
663 kfree(r);
664}
665
666static void handle_request(struct fw_card *card, struct fw_request *request,
667 int tcode, int destination, int source,
668 int generation, unsigned long long offset,
669 void *payload, size_t length, void *callback_data)
670{
671 struct address_handler_resource *handler = callback_data;
672 struct inbound_transaction_resource *r;
673 struct inbound_transaction_event *e;
674 size_t event_size0;
675 void *fcp_frame = NULL;
676 int ret;
677
678 /* card may be different from handler->client->device->card */
679 fw_card_get(card);
680
681 r = kmalloc(sizeof(*r), GFP_ATOMIC);
682 e = kmalloc(sizeof(*e), GFP_ATOMIC);
683 if (r == NULL || e == NULL)
684 goto failed;
685
686 r->card = card;
687 r->request = request;
688 r->data = payload;
689 r->length = length;
690
691 if (is_fcp_request(request)) {
692 /*
693 * FIXME: Let core-transaction.c manage a
694 * single reference-counted copy?
695 */
696 fcp_frame = kmemdup(payload, length, GFP_ATOMIC);
697 if (fcp_frame == NULL)
698 goto failed;
699
700 r->data = fcp_frame;
701 }
702
703 r->resource.release = release_request;
704 ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
705 if (ret < 0)
706 goto failed;
707
708 if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) {
709 struct fw_cdev_event_request *req = &e->req.request;
710
711 if (tcode & 0x10)
712 tcode = TCODE_LOCK_REQUEST;
713
714 req->type = FW_CDEV_EVENT_REQUEST;
715 req->tcode = tcode;
716 req->offset = offset;
717 req->length = length;
718 req->handle = r->resource.handle;
719 req->closure = handler->closure;
720 event_size0 = sizeof(*req);
721 } else {
722 struct fw_cdev_event_request2 *req = &e->req.request2;
723
724 req->type = FW_CDEV_EVENT_REQUEST2;
725 req->tcode = tcode;
726 req->offset = offset;
727 req->source_node_id = source;
728 req->destination_node_id = destination;
729 req->card = card->index;
730 req->generation = generation;
731 req->length = length;
732 req->handle = r->resource.handle;
733 req->closure = handler->closure;
734 event_size0 = sizeof(*req);
735 }
736
737 queue_event(handler->client, &e->event,
738 &e->req, event_size0, r->data, length);
739 return;
740
741 failed:
742 kfree(r);
743 kfree(e);
744 kfree(fcp_frame);
745
746 if (!is_fcp_request(request))
747 fw_send_response(card, request, RCODE_CONFLICT_ERROR);
748
749 fw_card_put(card);
750}
751
752static void release_address_handler(struct client *client,
753 struct client_resource *resource)
754{
755 struct address_handler_resource *r =
756 container_of(resource, struct address_handler_resource, resource);
757
758 fw_core_remove_address_handler(&r->handler);
759 kfree(r);
760}
761
762static int ioctl_allocate(struct client *client, union ioctl_arg *arg)
763{
764 struct fw_cdev_allocate *a = &arg->allocate;
765 struct address_handler_resource *r;
766 struct fw_address_region region;
767 int ret;
768
769 r = kmalloc(sizeof(*r), GFP_KERNEL);
770 if (r == NULL)
771 return -ENOMEM;
772
773 region.start = a->offset;
774 if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END)
775 region.end = a->offset + a->length;
776 else
777 region.end = a->region_end;
778
779 r->handler.length = a->length;
780 r->handler.address_callback = handle_request;
781 r->handler.callback_data = r;
782 r->closure = a->closure;
783 r->client = client;
784
785 ret = fw_core_add_address_handler(&r->handler, ®ion);
786 if (ret < 0) {
787 kfree(r);
788 return ret;
789 }
790 a->offset = r->handler.offset;
791
792 r->resource.release = release_address_handler;
793 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
794 if (ret < 0) {
795 release_address_handler(client, &r->resource);
796 return ret;
797 }
798 a->handle = r->resource.handle;
799
800 return 0;
801}
802
803static int ioctl_deallocate(struct client *client, union ioctl_arg *arg)
804{
805 return release_client_resource(client, arg->deallocate.handle,
806 release_address_handler, NULL);
807}
808
809static int ioctl_send_response(struct client *client, union ioctl_arg *arg)
810{
811 struct fw_cdev_send_response *a = &arg->send_response;
812 struct client_resource *resource;
813 struct inbound_transaction_resource *r;
814 int ret = 0;
815
816 if (release_client_resource(client, a->handle,
817 release_request, &resource) < 0)
818 return -EINVAL;
819
820 r = container_of(resource, struct inbound_transaction_resource,
821 resource);
822 if (is_fcp_request(r->request)) {
823 kfree(r->data);
824 goto out;
825 }
826
827 if (a->length != fw_get_response_length(r->request)) {
828 ret = -EINVAL;
829 kfree(r->request);
830 goto out;
831 }
832 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) {
833 ret = -EFAULT;
834 kfree(r->request);
835 goto out;
836 }
837 fw_send_response(r->card, r->request, a->rcode);
838 out:
839 fw_card_put(r->card);
840 kfree(r);
841
842 return ret;
843}
844
845static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg)
846{
847 fw_schedule_bus_reset(client->device->card, true,
848 arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET);
849 return 0;
850}
851
852static void release_descriptor(struct client *client,
853 struct client_resource *resource)
854{
855 struct descriptor_resource *r =
856 container_of(resource, struct descriptor_resource, resource);
857
858 fw_core_remove_descriptor(&r->descriptor);
859 kfree(r);
860}
861
862static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg)
863{
864 struct fw_cdev_add_descriptor *a = &arg->add_descriptor;
865 struct descriptor_resource *r;
866 int ret;
867
868 /* Access policy: Allow this ioctl only on local nodes' device files. */
869 if (!client->device->is_local)
870 return -ENOSYS;
871
872 if (a->length > 256)
873 return -EINVAL;
874
875 r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL);
876 if (r == NULL)
877 return -ENOMEM;
878
879 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) {
880 ret = -EFAULT;
881 goto failed;
882 }
883
884 r->descriptor.length = a->length;
885 r->descriptor.immediate = a->immediate;
886 r->descriptor.key = a->key;
887 r->descriptor.data = r->data;
888
889 ret = fw_core_add_descriptor(&r->descriptor);
890 if (ret < 0)
891 goto failed;
892
893 r->resource.release = release_descriptor;
894 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
895 if (ret < 0) {
896 fw_core_remove_descriptor(&r->descriptor);
897 goto failed;
898 }
899 a->handle = r->resource.handle;
900
901 return 0;
902 failed:
903 kfree(r);
904
905 return ret;
906}
907
908static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg)
909{
910 return release_client_resource(client, arg->remove_descriptor.handle,
911 release_descriptor, NULL);
912}
913
914static void iso_callback(struct fw_iso_context *context, u32 cycle,
915 size_t header_length, void *header, void *data)
916{
917 struct client *client = data;
918 struct iso_interrupt_event *e;
919
920 e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC);
921 if (e == NULL)
922 return;
923
924 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
925 e->interrupt.closure = client->iso_closure;
926 e->interrupt.cycle = cycle;
927 e->interrupt.header_length = header_length;
928 memcpy(e->interrupt.header, header, header_length);
929 queue_event(client, &e->event, &e->interrupt,
930 sizeof(e->interrupt) + header_length, NULL, 0);
931}
932
933static void iso_mc_callback(struct fw_iso_context *context,
934 dma_addr_t completed, void *data)
935{
936 struct client *client = data;
937 struct iso_interrupt_mc_event *e;
938
939 e = kmalloc(sizeof(*e), GFP_ATOMIC);
940 if (e == NULL)
941 return;
942
943 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL;
944 e->interrupt.closure = client->iso_closure;
945 e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer,
946 completed);
947 queue_event(client, &e->event, &e->interrupt,
948 sizeof(e->interrupt), NULL, 0);
949}
950
951static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context)
952{
953 if (context->type == FW_ISO_CONTEXT_TRANSMIT)
954 return DMA_TO_DEVICE;
955 else
956 return DMA_FROM_DEVICE;
957}
958
959static struct fw_iso_context *fw_iso_mc_context_create(struct fw_card *card,
960 fw_iso_mc_callback_t callback,
961 void *callback_data)
962{
963 struct fw_iso_context *ctx;
964
965 ctx = fw_iso_context_create(card, FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL,
966 0, 0, 0, NULL, callback_data);
967 if (!IS_ERR(ctx))
968 ctx->callback.mc = callback;
969
970 return ctx;
971}
972
973static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
974{
975 struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
976 struct fw_iso_context *context;
977 union fw_iso_callback cb;
978 int ret;
979
980 BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||
981 FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE ||
982 FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL !=
983 FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL);
984
985 switch (a->type) {
986 case FW_ISO_CONTEXT_TRANSMIT:
987 if (a->speed > SCODE_3200 || a->channel > 63)
988 return -EINVAL;
989
990 cb.sc = iso_callback;
991 break;
992
993 case FW_ISO_CONTEXT_RECEIVE:
994 if (a->header_size < 4 || (a->header_size & 3) ||
995 a->channel > 63)
996 return -EINVAL;
997
998 cb.sc = iso_callback;
999 break;
1000
1001 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
1002 cb.mc = iso_mc_callback;
1003 break;
1004
1005 default:
1006 return -EINVAL;
1007 }
1008
1009 if (a->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
1010 context = fw_iso_mc_context_create(client->device->card, cb.mc,
1011 client);
1012 else
1013 context = fw_iso_context_create(client->device->card, a->type,
1014 a->channel, a->speed,
1015 a->header_size, cb.sc, client);
1016 if (IS_ERR(context))
1017 return PTR_ERR(context);
1018 if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW)
1019 context->drop_overflow_headers = true;
1020
1021 /* We only support one context at this time. */
1022 spin_lock_irq(&client->lock);
1023 if (client->iso_context != NULL) {
1024 spin_unlock_irq(&client->lock);
1025 fw_iso_context_destroy(context);
1026
1027 return -EBUSY;
1028 }
1029 if (!client->buffer_is_mapped) {
1030 ret = fw_iso_buffer_map_dma(&client->buffer,
1031 client->device->card,
1032 iso_dma_direction(context));
1033 if (ret < 0) {
1034 spin_unlock_irq(&client->lock);
1035 fw_iso_context_destroy(context);
1036
1037 return ret;
1038 }
1039 client->buffer_is_mapped = true;
1040 }
1041 client->iso_closure = a->closure;
1042 client->iso_context = context;
1043 spin_unlock_irq(&client->lock);
1044
1045 a->handle = 0;
1046
1047 return 0;
1048}
1049
1050static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg)
1051{
1052 struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels;
1053 struct fw_iso_context *ctx = client->iso_context;
1054
1055 if (ctx == NULL || a->handle != 0)
1056 return -EINVAL;
1057
1058 return fw_iso_context_set_channels(ctx, &a->channels);
1059}
1060
1061/* Macros for decoding the iso packet control header. */
1062#define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff)
1063#define GET_INTERRUPT(v) (((v) >> 16) & 0x01)
1064#define GET_SKIP(v) (((v) >> 17) & 0x01)
1065#define GET_TAG(v) (((v) >> 18) & 0x03)
1066#define GET_SY(v) (((v) >> 20) & 0x0f)
1067#define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff)
1068
1069static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
1070{
1071 struct fw_cdev_queue_iso *a = &arg->queue_iso;
1072 struct fw_cdev_iso_packet __user *p, *end, *next;
1073 struct fw_iso_context *ctx = client->iso_context;
1074 unsigned long payload, buffer_end, transmit_header_bytes = 0;
1075 u32 control;
1076 int count;
1077 struct {
1078 struct fw_iso_packet packet;
1079 u8 header[256];
1080 } u;
1081
1082 if (ctx == NULL || a->handle != 0)
1083 return -EINVAL;
1084
1085 /*
1086 * If the user passes a non-NULL data pointer, has mmap()'ed
1087 * the iso buffer, and the pointer points inside the buffer,
1088 * we setup the payload pointers accordingly. Otherwise we
1089 * set them both to 0, which will still let packets with
1090 * payload_length == 0 through. In other words, if no packets
1091 * use the indirect payload, the iso buffer need not be mapped
1092 * and the a->data pointer is ignored.
1093 */
1094 payload = (unsigned long)a->data - client->vm_start;
1095 buffer_end = client->buffer.page_count << PAGE_SHIFT;
1096 if (a->data == 0 || client->buffer.pages == NULL ||
1097 payload >= buffer_end) {
1098 payload = 0;
1099 buffer_end = 0;
1100 }
1101
1102 if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3)
1103 return -EINVAL;
1104
1105 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);
1106
1107 end = (void __user *)p + a->size;
1108 count = 0;
1109 while (p < end) {
1110 if (get_user(control, &p->control))
1111 return -EFAULT;
1112 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
1113 u.packet.interrupt = GET_INTERRUPT(control);
1114 u.packet.skip = GET_SKIP(control);
1115 u.packet.tag = GET_TAG(control);
1116 u.packet.sy = GET_SY(control);
1117 u.packet.header_length = GET_HEADER_LENGTH(control);
1118
1119 switch (ctx->type) {
1120 case FW_ISO_CONTEXT_TRANSMIT:
1121 if (u.packet.header_length & 3)
1122 return -EINVAL;
1123 transmit_header_bytes = u.packet.header_length;
1124 break;
1125
1126 case FW_ISO_CONTEXT_RECEIVE:
1127 if (u.packet.header_length == 0 ||
1128 u.packet.header_length % ctx->header_size != 0)
1129 return -EINVAL;
1130 break;
1131
1132 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
1133 if (u.packet.payload_length == 0 ||
1134 u.packet.payload_length & 3)
1135 return -EINVAL;
1136 break;
1137 }
1138
1139 next = (struct fw_cdev_iso_packet __user *)
1140 &p->header[transmit_header_bytes / 4];
1141 if (next > end)
1142 return -EINVAL;
1143 if (copy_from_user
1144 (u.packet.header, p->header, transmit_header_bytes))
1145 return -EFAULT;
1146 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
1147 u.packet.header_length + u.packet.payload_length > 0)
1148 return -EINVAL;
1149 if (payload + u.packet.payload_length > buffer_end)
1150 return -EINVAL;
1151
1152 if (fw_iso_context_queue(ctx, &u.packet,
1153 &client->buffer, payload))
1154 break;
1155
1156 p = next;
1157 payload += u.packet.payload_length;
1158 count++;
1159 }
1160 fw_iso_context_queue_flush(ctx);
1161
1162 a->size -= uptr_to_u64(p) - a->packets;
1163 a->packets = uptr_to_u64(p);
1164 a->data = client->vm_start + payload;
1165
1166 return count;
1167}
1168
1169static int ioctl_start_iso(struct client *client, union ioctl_arg *arg)
1170{
1171 struct fw_cdev_start_iso *a = &arg->start_iso;
1172
1173 BUILD_BUG_ON(
1174 FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 ||
1175 FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 ||
1176 FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 ||
1177 FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 ||
1178 FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS);
1179
1180 if (client->iso_context == NULL || a->handle != 0)
1181 return -EINVAL;
1182
1183 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE &&
1184 (a->tags == 0 || a->tags > 15 || a->sync > 15))
1185 return -EINVAL;
1186
1187 return fw_iso_context_start(client->iso_context,
1188 a->cycle, a->sync, a->tags);
1189}
1190
1191static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg)
1192{
1193 struct fw_cdev_stop_iso *a = &arg->stop_iso;
1194
1195 if (client->iso_context == NULL || a->handle != 0)
1196 return -EINVAL;
1197
1198 return fw_iso_context_stop(client->iso_context);
1199}
1200
1201static int ioctl_flush_iso(struct client *client, union ioctl_arg *arg)
1202{
1203 struct fw_cdev_flush_iso *a = &arg->flush_iso;
1204
1205 if (client->iso_context == NULL || a->handle != 0)
1206 return -EINVAL;
1207
1208 return fw_iso_context_flush_completions(client->iso_context);
1209}
1210
1211static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg)
1212{
1213 struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2;
1214 struct fw_card *card = client->device->card;
1215 struct timespec64 ts = {0, 0};
1216 u32 cycle_time = 0;
1217 int ret = 0;
1218
1219 local_irq_disable();
1220
1221 ret = fw_card_read_cycle_time(card, &cycle_time);
1222 if (ret < 0)
1223 goto end;
1224
1225 switch (a->clk_id) {
1226 case CLOCK_REALTIME: ktime_get_real_ts64(&ts); break;
1227 case CLOCK_MONOTONIC: ktime_get_ts64(&ts); break;
1228 case CLOCK_MONOTONIC_RAW: ktime_get_raw_ts64(&ts); break;
1229 default:
1230 ret = -EINVAL;
1231 }
1232end:
1233 local_irq_enable();
1234
1235 a->tv_sec = ts.tv_sec;
1236 a->tv_nsec = ts.tv_nsec;
1237 a->cycle_timer = cycle_time;
1238
1239 return ret;
1240}
1241
1242static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg)
1243{
1244 struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer;
1245 struct fw_cdev_get_cycle_timer2 ct2;
1246
1247 ct2.clk_id = CLOCK_REALTIME;
1248 ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2);
1249
1250 a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC;
1251 a->cycle_timer = ct2.cycle_timer;
1252
1253 return 0;
1254}
1255
1256static void iso_resource_work(struct work_struct *work)
1257{
1258 struct iso_resource_event *e;
1259 struct iso_resource *r =
1260 container_of(work, struct iso_resource, work.work);
1261 struct client *client = r->client;
1262 int generation, channel, bandwidth, todo;
1263 bool skip, free, success;
1264
1265 spin_lock_irq(&client->lock);
1266 generation = client->device->generation;
1267 todo = r->todo;
1268 /* Allow 1000ms grace period for other reallocations. */
1269 if (todo == ISO_RES_ALLOC &&
1270 time_before64(get_jiffies_64(),
1271 client->device->card->reset_jiffies + HZ)) {
1272 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
1273 skip = true;
1274 } else {
1275 /* We could be called twice within the same generation. */
1276 skip = todo == ISO_RES_REALLOC &&
1277 r->generation == generation;
1278 }
1279 free = todo == ISO_RES_DEALLOC ||
1280 todo == ISO_RES_ALLOC_ONCE ||
1281 todo == ISO_RES_DEALLOC_ONCE;
1282 r->generation = generation;
1283 spin_unlock_irq(&client->lock);
1284
1285 if (skip)
1286 goto out;
1287
1288 bandwidth = r->bandwidth;
1289
1290 fw_iso_resource_manage(client->device->card, generation,
1291 r->channels, &channel, &bandwidth,
1292 todo == ISO_RES_ALLOC ||
1293 todo == ISO_RES_REALLOC ||
1294 todo == ISO_RES_ALLOC_ONCE);
1295 /*
1296 * Is this generation outdated already? As long as this resource sticks
1297 * in the idr, it will be scheduled again for a newer generation or at
1298 * shutdown.
1299 */
1300 if (channel == -EAGAIN &&
1301 (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1302 goto out;
1303
1304 success = channel >= 0 || bandwidth > 0;
1305
1306 spin_lock_irq(&client->lock);
1307 /*
1308 * Transit from allocation to reallocation, except if the client
1309 * requested deallocation in the meantime.
1310 */
1311 if (r->todo == ISO_RES_ALLOC)
1312 r->todo = ISO_RES_REALLOC;
1313 /*
1314 * Allocation or reallocation failure? Pull this resource out of the
1315 * idr and prepare for deletion, unless the client is shutting down.
1316 */
1317 if (r->todo == ISO_RES_REALLOC && !success &&
1318 !client->in_shutdown &&
1319 idr_remove(&client->resource_idr, r->resource.handle)) {
1320 client_put(client);
1321 free = true;
1322 }
1323 spin_unlock_irq(&client->lock);
1324
1325 if (todo == ISO_RES_ALLOC && channel >= 0)
1326 r->channels = 1ULL << channel;
1327
1328 if (todo == ISO_RES_REALLOC && success)
1329 goto out;
1330
1331 if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1332 e = r->e_alloc;
1333 r->e_alloc = NULL;
1334 } else {
1335 e = r->e_dealloc;
1336 r->e_dealloc = NULL;
1337 }
1338 e->iso_resource.handle = r->resource.handle;
1339 e->iso_resource.channel = channel;
1340 e->iso_resource.bandwidth = bandwidth;
1341
1342 queue_event(client, &e->event,
1343 &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
1344
1345 if (free) {
1346 cancel_delayed_work(&r->work);
1347 kfree(r->e_alloc);
1348 kfree(r->e_dealloc);
1349 kfree(r);
1350 }
1351 out:
1352 client_put(client);
1353}
1354
1355static void release_iso_resource(struct client *client,
1356 struct client_resource *resource)
1357{
1358 struct iso_resource *r =
1359 container_of(resource, struct iso_resource, resource);
1360
1361 spin_lock_irq(&client->lock);
1362 r->todo = ISO_RES_DEALLOC;
1363 schedule_iso_resource(r, 0);
1364 spin_unlock_irq(&client->lock);
1365}
1366
1367static int init_iso_resource(struct client *client,
1368 struct fw_cdev_allocate_iso_resource *request, int todo)
1369{
1370 struct iso_resource_event *e1, *e2;
1371 struct iso_resource *r;
1372 int ret;
1373
1374 if ((request->channels == 0 && request->bandwidth == 0) ||
1375 request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL)
1376 return -EINVAL;
1377
1378 r = kmalloc(sizeof(*r), GFP_KERNEL);
1379 e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1380 e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1381 if (r == NULL || e1 == NULL || e2 == NULL) {
1382 ret = -ENOMEM;
1383 goto fail;
1384 }
1385
1386 INIT_DELAYED_WORK(&r->work, iso_resource_work);
1387 r->client = client;
1388 r->todo = todo;
1389 r->generation = -1;
1390 r->channels = request->channels;
1391 r->bandwidth = request->bandwidth;
1392 r->e_alloc = e1;
1393 r->e_dealloc = e2;
1394
1395 e1->iso_resource.closure = request->closure;
1396 e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1397 e2->iso_resource.closure = request->closure;
1398 e2->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1399
1400 if (todo == ISO_RES_ALLOC) {
1401 r->resource.release = release_iso_resource;
1402 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1403 if (ret < 0)
1404 goto fail;
1405 } else {
1406 r->resource.release = NULL;
1407 r->resource.handle = -1;
1408 schedule_iso_resource(r, 0);
1409 }
1410 request->handle = r->resource.handle;
1411
1412 return 0;
1413 fail:
1414 kfree(r);
1415 kfree(e1);
1416 kfree(e2);
1417
1418 return ret;
1419}
1420
1421static int ioctl_allocate_iso_resource(struct client *client,
1422 union ioctl_arg *arg)
1423{
1424 return init_iso_resource(client,
1425 &arg->allocate_iso_resource, ISO_RES_ALLOC);
1426}
1427
1428static int ioctl_deallocate_iso_resource(struct client *client,
1429 union ioctl_arg *arg)
1430{
1431 return release_client_resource(client,
1432 arg->deallocate.handle, release_iso_resource, NULL);
1433}
1434
1435static int ioctl_allocate_iso_resource_once(struct client *client,
1436 union ioctl_arg *arg)
1437{
1438 return init_iso_resource(client,
1439 &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE);
1440}
1441
1442static int ioctl_deallocate_iso_resource_once(struct client *client,
1443 union ioctl_arg *arg)
1444{
1445 return init_iso_resource(client,
1446 &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE);
1447}
1448
1449/*
1450 * Returns a speed code: Maximum speed to or from this device,
1451 * limited by the device's link speed, the local node's link speed,
1452 * and all PHY port speeds between the two links.
1453 */
1454static int ioctl_get_speed(struct client *client, union ioctl_arg *arg)
1455{
1456 return client->device->max_speed;
1457}
1458
1459static int ioctl_send_broadcast_request(struct client *client,
1460 union ioctl_arg *arg)
1461{
1462 struct fw_cdev_send_request *a = &arg->send_request;
1463
1464 switch (a->tcode) {
1465 case TCODE_WRITE_QUADLET_REQUEST:
1466 case TCODE_WRITE_BLOCK_REQUEST:
1467 break;
1468 default:
1469 return -EINVAL;
1470 }
1471
1472 /* Security policy: Only allow accesses to Units Space. */
1473 if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1474 return -EACCES;
1475
1476 return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100);
1477}
1478
1479static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg)
1480{
1481 struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet;
1482 struct fw_cdev_send_request request;
1483 int dest;
1484
1485 if (a->speed > client->device->card->link_speed ||
1486 a->length > 1024 << a->speed)
1487 return -EIO;
1488
1489 if (a->tag > 3 || a->channel > 63 || a->sy > 15)
1490 return -EINVAL;
1491
1492 dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy);
1493 request.tcode = TCODE_STREAM_DATA;
1494 request.length = a->length;
1495 request.closure = a->closure;
1496 request.data = a->data;
1497 request.generation = a->generation;
1498
1499 return init_request(client, &request, dest, a->speed);
1500}
1501
1502static void outbound_phy_packet_callback(struct fw_packet *packet,
1503 struct fw_card *card, int status)
1504{
1505 struct outbound_phy_packet_event *e =
1506 container_of(packet, struct outbound_phy_packet_event, p);
1507 struct client *e_client;
1508
1509 switch (status) {
1510 /* expected: */
1511 case ACK_COMPLETE: e->phy_packet.rcode = RCODE_COMPLETE; break;
1512 /* should never happen with PHY packets: */
1513 case ACK_PENDING: e->phy_packet.rcode = RCODE_COMPLETE; break;
1514 case ACK_BUSY_X:
1515 case ACK_BUSY_A:
1516 case ACK_BUSY_B: e->phy_packet.rcode = RCODE_BUSY; break;
1517 case ACK_DATA_ERROR: e->phy_packet.rcode = RCODE_DATA_ERROR; break;
1518 case ACK_TYPE_ERROR: e->phy_packet.rcode = RCODE_TYPE_ERROR; break;
1519 /* stale generation; cancelled; on certain controllers: no ack */
1520 default: e->phy_packet.rcode = status; break;
1521 }
1522 e->phy_packet.data[0] = packet->timestamp;
1523
1524 e_client = e->client;
1525 queue_event(e->client, &e->event, &e->phy_packet,
1526 sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0);
1527 client_put(e_client);
1528}
1529
1530static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg)
1531{
1532 struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet;
1533 struct fw_card *card = client->device->card;
1534 struct outbound_phy_packet_event *e;
1535
1536 /* Access policy: Allow this ioctl only on local nodes' device files. */
1537 if (!client->device->is_local)
1538 return -ENOSYS;
1539
1540 e = kzalloc(sizeof(*e) + 4, GFP_KERNEL);
1541 if (e == NULL)
1542 return -ENOMEM;
1543
1544 client_get(client);
1545 e->client = client;
1546 e->p.speed = SCODE_100;
1547 e->p.generation = a->generation;
1548 e->p.header[0] = TCODE_LINK_INTERNAL << 4;
1549 e->p.header[1] = a->data[0];
1550 e->p.header[2] = a->data[1];
1551 e->p.header_length = 12;
1552 e->p.callback = outbound_phy_packet_callback;
1553 e->phy_packet.closure = a->closure;
1554 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_SENT;
1555 if (is_ping_packet(a->data))
1556 e->phy_packet.length = 4;
1557
1558 card->driver->send_request(card, &e->p);
1559
1560 return 0;
1561}
1562
1563static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg)
1564{
1565 struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets;
1566 struct fw_card *card = client->device->card;
1567
1568 /* Access policy: Allow this ioctl only on local nodes' device files. */
1569 if (!client->device->is_local)
1570 return -ENOSYS;
1571
1572 spin_lock_irq(&card->lock);
1573
1574 list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list);
1575 client->phy_receiver_closure = a->closure;
1576
1577 spin_unlock_irq(&card->lock);
1578
1579 return 0;
1580}
1581
1582void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p)
1583{
1584 struct client *client;
1585 struct inbound_phy_packet_event *e;
1586 unsigned long flags;
1587
1588 spin_lock_irqsave(&card->lock, flags);
1589
1590 list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) {
1591 e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC);
1592 if (e == NULL)
1593 break;
1594
1595 e->phy_packet.closure = client->phy_receiver_closure;
1596 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED;
1597 e->phy_packet.rcode = RCODE_COMPLETE;
1598 e->phy_packet.length = 8;
1599 e->phy_packet.data[0] = p->header[1];
1600 e->phy_packet.data[1] = p->header[2];
1601 queue_event(client, &e->event,
1602 &e->phy_packet, sizeof(e->phy_packet) + 8, NULL, 0);
1603 }
1604
1605 spin_unlock_irqrestore(&card->lock, flags);
1606}
1607
1608static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = {
1609 [0x00] = ioctl_get_info,
1610 [0x01] = ioctl_send_request,
1611 [0x02] = ioctl_allocate,
1612 [0x03] = ioctl_deallocate,
1613 [0x04] = ioctl_send_response,
1614 [0x05] = ioctl_initiate_bus_reset,
1615 [0x06] = ioctl_add_descriptor,
1616 [0x07] = ioctl_remove_descriptor,
1617 [0x08] = ioctl_create_iso_context,
1618 [0x09] = ioctl_queue_iso,
1619 [0x0a] = ioctl_start_iso,
1620 [0x0b] = ioctl_stop_iso,
1621 [0x0c] = ioctl_get_cycle_timer,
1622 [0x0d] = ioctl_allocate_iso_resource,
1623 [0x0e] = ioctl_deallocate_iso_resource,
1624 [0x0f] = ioctl_allocate_iso_resource_once,
1625 [0x10] = ioctl_deallocate_iso_resource_once,
1626 [0x11] = ioctl_get_speed,
1627 [0x12] = ioctl_send_broadcast_request,
1628 [0x13] = ioctl_send_stream_packet,
1629 [0x14] = ioctl_get_cycle_timer2,
1630 [0x15] = ioctl_send_phy_packet,
1631 [0x16] = ioctl_receive_phy_packets,
1632 [0x17] = ioctl_set_iso_channels,
1633 [0x18] = ioctl_flush_iso,
1634};
1635
1636static int dispatch_ioctl(struct client *client,
1637 unsigned int cmd, void __user *arg)
1638{
1639 union ioctl_arg buffer;
1640 int ret;
1641
1642 if (fw_device_is_shutdown(client->device))
1643 return -ENODEV;
1644
1645 if (_IOC_TYPE(cmd) != '#' ||
1646 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) ||
1647 _IOC_SIZE(cmd) > sizeof(buffer))
1648 return -ENOTTY;
1649
1650 memset(&buffer, 0, sizeof(buffer));
1651
1652 if (_IOC_DIR(cmd) & _IOC_WRITE)
1653 if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd)))
1654 return -EFAULT;
1655
1656 ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer);
1657 if (ret < 0)
1658 return ret;
1659
1660 if (_IOC_DIR(cmd) & _IOC_READ)
1661 if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd)))
1662 return -EFAULT;
1663
1664 return ret;
1665}
1666
1667static long fw_device_op_ioctl(struct file *file,
1668 unsigned int cmd, unsigned long arg)
1669{
1670 return dispatch_ioctl(file->private_data, cmd, (void __user *)arg);
1671}
1672
1673static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1674{
1675 struct client *client = file->private_data;
1676 unsigned long size;
1677 int page_count, ret;
1678
1679 if (fw_device_is_shutdown(client->device))
1680 return -ENODEV;
1681
1682 /* FIXME: We could support multiple buffers, but we don't. */
1683 if (client->buffer.pages != NULL)
1684 return -EBUSY;
1685
1686 if (!(vma->vm_flags & VM_SHARED))
1687 return -EINVAL;
1688
1689 if (vma->vm_start & ~PAGE_MASK)
1690 return -EINVAL;
1691
1692 client->vm_start = vma->vm_start;
1693 size = vma->vm_end - vma->vm_start;
1694 page_count = size >> PAGE_SHIFT;
1695 if (size & ~PAGE_MASK)
1696 return -EINVAL;
1697
1698 ret = fw_iso_buffer_alloc(&client->buffer, page_count);
1699 if (ret < 0)
1700 return ret;
1701
1702 spin_lock_irq(&client->lock);
1703 if (client->iso_context) {
1704 ret = fw_iso_buffer_map_dma(&client->buffer,
1705 client->device->card,
1706 iso_dma_direction(client->iso_context));
1707 client->buffer_is_mapped = (ret == 0);
1708 }
1709 spin_unlock_irq(&client->lock);
1710 if (ret < 0)
1711 goto fail;
1712
1713 ret = vm_map_pages_zero(vma, client->buffer.pages,
1714 client->buffer.page_count);
1715 if (ret < 0)
1716 goto fail;
1717
1718 return 0;
1719 fail:
1720 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1721 return ret;
1722}
1723
1724static int is_outbound_transaction_resource(int id, void *p, void *data)
1725{
1726 struct client_resource *resource = p;
1727
1728 return resource->release == release_transaction;
1729}
1730
1731static int has_outbound_transactions(struct client *client)
1732{
1733 int ret;
1734
1735 spin_lock_irq(&client->lock);
1736 ret = idr_for_each(&client->resource_idr,
1737 is_outbound_transaction_resource, NULL);
1738 spin_unlock_irq(&client->lock);
1739
1740 return ret;
1741}
1742
1743static int shutdown_resource(int id, void *p, void *data)
1744{
1745 struct client_resource *resource = p;
1746 struct client *client = data;
1747
1748 resource->release(client, resource);
1749 client_put(client);
1750
1751 return 0;
1752}
1753
1754static int fw_device_op_release(struct inode *inode, struct file *file)
1755{
1756 struct client *client = file->private_data;
1757 struct event *event, *next_event;
1758
1759 spin_lock_irq(&client->device->card->lock);
1760 list_del(&client->phy_receiver_link);
1761 spin_unlock_irq(&client->device->card->lock);
1762
1763 mutex_lock(&client->device->client_list_mutex);
1764 list_del(&client->link);
1765 mutex_unlock(&client->device->client_list_mutex);
1766
1767 if (client->iso_context)
1768 fw_iso_context_destroy(client->iso_context);
1769
1770 if (client->buffer.pages)
1771 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1772
1773 /* Freeze client->resource_idr and client->event_list */
1774 spin_lock_irq(&client->lock);
1775 client->in_shutdown = true;
1776 spin_unlock_irq(&client->lock);
1777
1778 wait_event(client->tx_flush_wait, !has_outbound_transactions(client));
1779
1780 idr_for_each(&client->resource_idr, shutdown_resource, client);
1781 idr_destroy(&client->resource_idr);
1782
1783 list_for_each_entry_safe(event, next_event, &client->event_list, link)
1784 kfree(event);
1785
1786 client_put(client);
1787
1788 return 0;
1789}
1790
1791static __poll_t fw_device_op_poll(struct file *file, poll_table * pt)
1792{
1793 struct client *client = file->private_data;
1794 __poll_t mask = 0;
1795
1796 poll_wait(file, &client->wait, pt);
1797
1798 if (fw_device_is_shutdown(client->device))
1799 mask |= EPOLLHUP | EPOLLERR;
1800 if (!list_empty(&client->event_list))
1801 mask |= EPOLLIN | EPOLLRDNORM;
1802
1803 return mask;
1804}
1805
1806const struct file_operations fw_device_ops = {
1807 .owner = THIS_MODULE,
1808 .llseek = no_llseek,
1809 .open = fw_device_op_open,
1810 .read = fw_device_op_read,
1811 .unlocked_ioctl = fw_device_op_ioctl,
1812 .mmap = fw_device_op_mmap,
1813 .release = fw_device_op_release,
1814 .poll = fw_device_op_poll,
1815 .compat_ioctl = compat_ptr_ioctl,
1816};
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Char device for device raw access
4 *
5 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
6 */
7
8#include <linux/bug.h>
9#include <linux/compat.h>
10#include <linux/delay.h>
11#include <linux/device.h>
12#include <linux/dma-mapping.h>
13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/firewire.h>
16#include <linux/firewire-cdev.h>
17#include <linux/irqflags.h>
18#include <linux/jiffies.h>
19#include <linux/kernel.h>
20#include <linux/kref.h>
21#include <linux/mm.h>
22#include <linux/module.h>
23#include <linux/mutex.h>
24#include <linux/poll.h>
25#include <linux/sched.h> /* required for linux/wait.h */
26#include <linux/slab.h>
27#include <linux/spinlock.h>
28#include <linux/string.h>
29#include <linux/time.h>
30#include <linux/uaccess.h>
31#include <linux/vmalloc.h>
32#include <linux/wait.h>
33#include <linux/workqueue.h>
34
35
36#include "core.h"
37#include <trace/events/firewire.h>
38
39#include "packet-header-definitions.h"
40
41/*
42 * ABI version history is documented in linux/firewire-cdev.h.
43 */
44#define FW_CDEV_KERNEL_VERSION 5
45#define FW_CDEV_VERSION_EVENT_REQUEST2 4
46#define FW_CDEV_VERSION_ALLOCATE_REGION_END 4
47#define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5
48#define FW_CDEV_VERSION_EVENT_ASYNC_TSTAMP 6
49
50struct client {
51 u32 version;
52 struct fw_device *device;
53
54 spinlock_t lock;
55 bool in_shutdown;
56 struct xarray resource_xa;
57 struct list_head event_list;
58 wait_queue_head_t wait;
59 wait_queue_head_t tx_flush_wait;
60 u64 bus_reset_closure;
61
62 struct fw_iso_context *iso_context;
63 u64 iso_closure;
64 struct fw_iso_buffer buffer;
65 unsigned long vm_start;
66 bool buffer_is_mapped;
67
68 struct list_head phy_receiver_link;
69 u64 phy_receiver_closure;
70
71 struct list_head link;
72 struct kref kref;
73};
74
75static inline void client_get(struct client *client)
76{
77 kref_get(&client->kref);
78}
79
80static void client_release(struct kref *kref)
81{
82 struct client *client = container_of(kref, struct client, kref);
83
84 fw_device_put(client->device);
85 kfree(client);
86}
87
88static void client_put(struct client *client)
89{
90 kref_put(&client->kref, client_release);
91}
92
93struct client_resource;
94typedef void (*client_resource_release_fn_t)(struct client *,
95 struct client_resource *);
96struct client_resource {
97 client_resource_release_fn_t release;
98 int handle;
99};
100
101struct address_handler_resource {
102 struct client_resource resource;
103 struct fw_address_handler handler;
104 __u64 closure;
105 struct client *client;
106};
107
108struct outbound_transaction_resource {
109 struct client_resource resource;
110 struct fw_transaction transaction;
111};
112
113struct inbound_transaction_resource {
114 struct client_resource resource;
115 struct fw_card *card;
116 struct fw_request *request;
117 bool is_fcp;
118 void *data;
119 size_t length;
120};
121
122struct descriptor_resource {
123 struct client_resource resource;
124 struct fw_descriptor descriptor;
125 u32 data[];
126};
127
128struct iso_resource {
129 struct client_resource resource;
130 struct client *client;
131 /* Schedule work and access todo only with client->lock held. */
132 struct delayed_work work;
133 enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
134 ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
135 int generation;
136 u64 channels;
137 s32 bandwidth;
138 struct iso_resource_event *e_alloc, *e_dealloc;
139};
140
141static struct address_handler_resource *to_address_handler_resource(struct client_resource *resource)
142{
143 return container_of(resource, struct address_handler_resource, resource);
144}
145
146static struct inbound_transaction_resource *to_inbound_transaction_resource(struct client_resource *resource)
147{
148 return container_of(resource, struct inbound_transaction_resource, resource);
149}
150
151static struct descriptor_resource *to_descriptor_resource(struct client_resource *resource)
152{
153 return container_of(resource, struct descriptor_resource, resource);
154}
155
156static struct iso_resource *to_iso_resource(struct client_resource *resource)
157{
158 return container_of(resource, struct iso_resource, resource);
159}
160
161static void release_iso_resource(struct client *, struct client_resource *);
162
163static int is_iso_resource(const struct client_resource *resource)
164{
165 return resource->release == release_iso_resource;
166}
167
168static void release_transaction(struct client *client,
169 struct client_resource *resource);
170
171static int is_outbound_transaction_resource(const struct client_resource *resource)
172{
173 return resource->release == release_transaction;
174}
175
176static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
177{
178 client_get(r->client);
179 if (!queue_delayed_work(fw_workqueue, &r->work, delay))
180 client_put(r->client);
181}
182
183/*
184 * dequeue_event() just kfree()'s the event, so the event has to be
185 * the first field in a struct XYZ_event.
186 */
187struct event {
188 struct { void *data; size_t size; } v[2];
189 struct list_head link;
190};
191
192struct bus_reset_event {
193 struct event event;
194 struct fw_cdev_event_bus_reset reset;
195};
196
197struct outbound_transaction_event {
198 struct event event;
199 struct client *client;
200 struct outbound_transaction_resource r;
201 union {
202 struct fw_cdev_event_response without_tstamp;
203 struct fw_cdev_event_response2 with_tstamp;
204 } rsp;
205};
206
207struct inbound_transaction_event {
208 struct event event;
209 union {
210 struct fw_cdev_event_request request;
211 struct fw_cdev_event_request2 request2;
212 struct fw_cdev_event_request3 with_tstamp;
213 } req;
214};
215
216struct iso_interrupt_event {
217 struct event event;
218 struct fw_cdev_event_iso_interrupt interrupt;
219};
220
221struct iso_interrupt_mc_event {
222 struct event event;
223 struct fw_cdev_event_iso_interrupt_mc interrupt;
224};
225
226struct iso_resource_event {
227 struct event event;
228 struct fw_cdev_event_iso_resource iso_resource;
229};
230
231struct outbound_phy_packet_event {
232 struct event event;
233 struct client *client;
234 struct fw_packet p;
235 union {
236 struct fw_cdev_event_phy_packet without_tstamp;
237 struct fw_cdev_event_phy_packet2 with_tstamp;
238 } phy_packet;
239};
240
241struct inbound_phy_packet_event {
242 struct event event;
243 union {
244 struct fw_cdev_event_phy_packet without_tstamp;
245 struct fw_cdev_event_phy_packet2 with_tstamp;
246 } phy_packet;
247};
248
249#ifdef CONFIG_COMPAT
250static void __user *u64_to_uptr(u64 value)
251{
252 if (in_compat_syscall())
253 return compat_ptr(value);
254 else
255 return (void __user *)(unsigned long)value;
256}
257
258static u64 uptr_to_u64(void __user *ptr)
259{
260 if (in_compat_syscall())
261 return ptr_to_compat(ptr);
262 else
263 return (u64)(unsigned long)ptr;
264}
265#else
266static inline void __user *u64_to_uptr(u64 value)
267{
268 return (void __user *)(unsigned long)value;
269}
270
271static inline u64 uptr_to_u64(void __user *ptr)
272{
273 return (u64)(unsigned long)ptr;
274}
275#endif /* CONFIG_COMPAT */
276
277static int fw_device_op_open(struct inode *inode, struct file *file)
278{
279 struct fw_device *device;
280 struct client *client;
281
282 device = fw_device_get_by_devt(inode->i_rdev);
283 if (device == NULL)
284 return -ENODEV;
285
286 if (fw_device_is_shutdown(device)) {
287 fw_device_put(device);
288 return -ENODEV;
289 }
290
291 client = kzalloc(sizeof(*client), GFP_KERNEL);
292 if (client == NULL) {
293 fw_device_put(device);
294 return -ENOMEM;
295 }
296
297 client->device = device;
298 spin_lock_init(&client->lock);
299 xa_init_flags(&client->resource_xa, XA_FLAGS_ALLOC1 | XA_FLAGS_LOCK_BH);
300 INIT_LIST_HEAD(&client->event_list);
301 init_waitqueue_head(&client->wait);
302 init_waitqueue_head(&client->tx_flush_wait);
303 INIT_LIST_HEAD(&client->phy_receiver_link);
304 INIT_LIST_HEAD(&client->link);
305 kref_init(&client->kref);
306
307 file->private_data = client;
308
309 return nonseekable_open(inode, file);
310}
311
312static void queue_event(struct client *client, struct event *event,
313 void *data0, size_t size0, void *data1, size_t size1)
314{
315 event->v[0].data = data0;
316 event->v[0].size = size0;
317 event->v[1].data = data1;
318 event->v[1].size = size1;
319
320 scoped_guard(spinlock_irqsave, &client->lock) {
321 if (client->in_shutdown)
322 kfree(event);
323 else
324 list_add_tail(&event->link, &client->event_list);
325 }
326
327 wake_up_interruptible(&client->wait);
328}
329
330static int dequeue_event(struct client *client,
331 char __user *buffer, size_t count)
332{
333 struct event *event;
334 size_t size, total;
335 int i, ret;
336
337 ret = wait_event_interruptible(client->wait,
338 !list_empty(&client->event_list) ||
339 fw_device_is_shutdown(client->device));
340 if (ret < 0)
341 return ret;
342
343 if (list_empty(&client->event_list) &&
344 fw_device_is_shutdown(client->device))
345 return -ENODEV;
346
347 scoped_guard(spinlock_irq, &client->lock) {
348 event = list_first_entry(&client->event_list, struct event, link);
349 list_del(&event->link);
350 }
351
352 total = 0;
353 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
354 size = min(event->v[i].size, count - total);
355 if (copy_to_user(buffer + total, event->v[i].data, size)) {
356 ret = -EFAULT;
357 goto out;
358 }
359 total += size;
360 }
361 ret = total;
362
363 out:
364 kfree(event);
365
366 return ret;
367}
368
369static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
370 size_t count, loff_t *offset)
371{
372 struct client *client = file->private_data;
373
374 return dequeue_event(client, buffer, count);
375}
376
377static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
378 struct client *client)
379{
380 struct fw_card *card = client->device->card;
381
382 guard(spinlock_irq)(&card->lock);
383
384 event->closure = client->bus_reset_closure;
385 event->type = FW_CDEV_EVENT_BUS_RESET;
386 event->generation = client->device->generation;
387 event->node_id = client->device->node_id;
388 event->local_node_id = card->local_node->node_id;
389 event->bm_node_id = card->bm_node_id;
390 event->irm_node_id = card->irm_node->node_id;
391 event->root_node_id = card->root_node->node_id;
392}
393
394static void for_each_client(struct fw_device *device,
395 void (*callback)(struct client *client))
396{
397 struct client *c;
398
399 guard(mutex)(&device->client_list_mutex);
400
401 list_for_each_entry(c, &device->client_list, link)
402 callback(c);
403}
404
405static void queue_bus_reset_event(struct client *client)
406{
407 struct bus_reset_event *e;
408 struct client_resource *resource;
409 unsigned long index;
410
411 e = kzalloc(sizeof(*e), GFP_KERNEL);
412 if (e == NULL)
413 return;
414
415 fill_bus_reset_event(&e->reset, client);
416
417 queue_event(client, &e->event,
418 &e->reset, sizeof(e->reset), NULL, 0);
419
420 guard(spinlock_irq)(&client->lock);
421
422 xa_for_each(&client->resource_xa, index, resource) {
423 if (is_iso_resource(resource))
424 schedule_iso_resource(to_iso_resource(resource), 0);
425 }
426}
427
428void fw_device_cdev_update(struct fw_device *device)
429{
430 for_each_client(device, queue_bus_reset_event);
431}
432
433static void wake_up_client(struct client *client)
434{
435 wake_up_interruptible(&client->wait);
436}
437
438void fw_device_cdev_remove(struct fw_device *device)
439{
440 for_each_client(device, wake_up_client);
441}
442
443union ioctl_arg {
444 struct fw_cdev_get_info get_info;
445 struct fw_cdev_send_request send_request;
446 struct fw_cdev_allocate allocate;
447 struct fw_cdev_deallocate deallocate;
448 struct fw_cdev_send_response send_response;
449 struct fw_cdev_initiate_bus_reset initiate_bus_reset;
450 struct fw_cdev_add_descriptor add_descriptor;
451 struct fw_cdev_remove_descriptor remove_descriptor;
452 struct fw_cdev_create_iso_context create_iso_context;
453 struct fw_cdev_queue_iso queue_iso;
454 struct fw_cdev_start_iso start_iso;
455 struct fw_cdev_stop_iso stop_iso;
456 struct fw_cdev_get_cycle_timer get_cycle_timer;
457 struct fw_cdev_allocate_iso_resource allocate_iso_resource;
458 struct fw_cdev_send_stream_packet send_stream_packet;
459 struct fw_cdev_get_cycle_timer2 get_cycle_timer2;
460 struct fw_cdev_send_phy_packet send_phy_packet;
461 struct fw_cdev_receive_phy_packets receive_phy_packets;
462 struct fw_cdev_set_iso_channels set_iso_channels;
463 struct fw_cdev_flush_iso flush_iso;
464};
465
466static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
467{
468 struct fw_cdev_get_info *a = &arg->get_info;
469 struct fw_cdev_event_bus_reset bus_reset;
470 unsigned long ret = 0;
471
472 client->version = a->version;
473 a->version = FW_CDEV_KERNEL_VERSION;
474 a->card = client->device->card->index;
475
476 scoped_guard(rwsem_read, &fw_device_rwsem) {
477 if (a->rom != 0) {
478 size_t want = a->rom_length;
479 size_t have = client->device->config_rom_length * 4;
480
481 ret = copy_to_user(u64_to_uptr(a->rom), client->device->config_rom,
482 min(want, have));
483 if (ret != 0)
484 return -EFAULT;
485 }
486 a->rom_length = client->device->config_rom_length * 4;
487 }
488
489 guard(mutex)(&client->device->client_list_mutex);
490
491 client->bus_reset_closure = a->bus_reset_closure;
492 if (a->bus_reset != 0) {
493 fill_bus_reset_event(&bus_reset, client);
494 /* unaligned size of bus_reset is 36 bytes */
495 ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36);
496 }
497 if (ret == 0 && list_empty(&client->link))
498 list_add_tail(&client->link, &client->device->client_list);
499
500 return ret ? -EFAULT : 0;
501}
502
503static int add_client_resource(struct client *client, struct client_resource *resource,
504 gfp_t gfp_mask)
505{
506 int ret;
507
508 scoped_guard(spinlock_irqsave, &client->lock) {
509 u32 index;
510
511 if (client->in_shutdown) {
512 ret = -ECANCELED;
513 } else {
514 if (gfpflags_allow_blocking(gfp_mask)) {
515 ret = xa_alloc(&client->resource_xa, &index, resource, xa_limit_32b,
516 GFP_NOWAIT);
517 } else {
518 ret = xa_alloc_bh(&client->resource_xa, &index, resource,
519 xa_limit_32b, GFP_NOWAIT);
520 }
521 }
522 if (ret >= 0) {
523 resource->handle = index;
524 client_get(client);
525 if (is_iso_resource(resource))
526 schedule_iso_resource(to_iso_resource(resource), 0);
527 }
528 }
529
530 return ret < 0 ? ret : 0;
531}
532
533static int release_client_resource(struct client *client, u32 handle,
534 client_resource_release_fn_t release,
535 struct client_resource **return_resource)
536{
537 unsigned long index = handle;
538 struct client_resource *resource;
539
540 scoped_guard(spinlock_irq, &client->lock) {
541 if (client->in_shutdown)
542 return -EINVAL;
543
544 resource = xa_load(&client->resource_xa, index);
545 if (!resource || resource->release != release)
546 return -EINVAL;
547
548 xa_erase(&client->resource_xa, handle);
549 }
550
551 if (return_resource)
552 *return_resource = resource;
553 else
554 resource->release(client, resource);
555
556 client_put(client);
557
558 return 0;
559}
560
561static void release_transaction(struct client *client,
562 struct client_resource *resource)
563{
564}
565
566static void complete_transaction(struct fw_card *card, int rcode, u32 request_tstamp,
567 u32 response_tstamp, void *payload, size_t length, void *data)
568{
569 struct outbound_transaction_event *e = data;
570 struct client *client = e->client;
571 unsigned long index = e->r.resource.handle;
572
573 scoped_guard(spinlock_irqsave, &client->lock) {
574 xa_erase(&client->resource_xa, index);
575 if (client->in_shutdown)
576 wake_up(&client->tx_flush_wait);
577 }
578
579 switch (e->rsp.without_tstamp.type) {
580 case FW_CDEV_EVENT_RESPONSE:
581 {
582 struct fw_cdev_event_response *rsp = &e->rsp.without_tstamp;
583
584 if (length < rsp->length)
585 rsp->length = length;
586 if (rcode == RCODE_COMPLETE)
587 memcpy(rsp->data, payload, rsp->length);
588
589 rsp->rcode = rcode;
590
591 // In the case that sizeof(*rsp) doesn't align with the position of the
592 // data, and the read is short, preserve an extra copy of the data
593 // to stay compatible with a pre-2.6.27 bug. Since the bug is harmless
594 // for short reads and some apps depended on it, this is both safe
595 // and prudent for compatibility.
596 if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
597 queue_event(client, &e->event, rsp, sizeof(*rsp), rsp->data, rsp->length);
598 else
599 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, NULL, 0);
600
601 break;
602 }
603 case FW_CDEV_EVENT_RESPONSE2:
604 {
605 struct fw_cdev_event_response2 *rsp = &e->rsp.with_tstamp;
606
607 if (length < rsp->length)
608 rsp->length = length;
609 if (rcode == RCODE_COMPLETE)
610 memcpy(rsp->data, payload, rsp->length);
611
612 rsp->rcode = rcode;
613 rsp->request_tstamp = request_tstamp;
614 rsp->response_tstamp = response_tstamp;
615
616 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, NULL, 0);
617
618 break;
619 }
620 default:
621 WARN_ON(1);
622 break;
623 }
624
625 // Drop the xarray's reference.
626 client_put(client);
627}
628
629static int init_request(struct client *client,
630 struct fw_cdev_send_request *request,
631 int destination_id, int speed)
632{
633 struct outbound_transaction_event *e;
634 void *payload;
635 int ret;
636
637 if (request->tcode != TCODE_STREAM_DATA &&
638 (request->length > 4096 || request->length > 512 << speed))
639 return -EIO;
640
641 if (request->tcode == TCODE_WRITE_QUADLET_REQUEST &&
642 request->length < 4)
643 return -EINVAL;
644
645 e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
646 if (e == NULL)
647 return -ENOMEM;
648 e->client = client;
649
650 if (client->version < FW_CDEV_VERSION_EVENT_ASYNC_TSTAMP) {
651 struct fw_cdev_event_response *rsp = &e->rsp.without_tstamp;
652
653 rsp->type = FW_CDEV_EVENT_RESPONSE;
654 rsp->length = request->length;
655 rsp->closure = request->closure;
656 payload = rsp->data;
657 } else {
658 struct fw_cdev_event_response2 *rsp = &e->rsp.with_tstamp;
659
660 rsp->type = FW_CDEV_EVENT_RESPONSE2;
661 rsp->length = request->length;
662 rsp->closure = request->closure;
663 payload = rsp->data;
664 }
665
666 if (request->data && copy_from_user(payload, u64_to_uptr(request->data), request->length)) {
667 ret = -EFAULT;
668 goto failed;
669 }
670
671 e->r.resource.release = release_transaction;
672 ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
673 if (ret < 0)
674 goto failed;
675
676 fw_send_request_with_tstamp(client->device->card, &e->r.transaction, request->tcode,
677 destination_id, request->generation, speed, request->offset,
678 payload, request->length, complete_transaction, e);
679 return 0;
680
681 failed:
682 kfree(e);
683
684 return ret;
685}
686
687static int ioctl_send_request(struct client *client, union ioctl_arg *arg)
688{
689 switch (arg->send_request.tcode) {
690 case TCODE_WRITE_QUADLET_REQUEST:
691 case TCODE_WRITE_BLOCK_REQUEST:
692 case TCODE_READ_QUADLET_REQUEST:
693 case TCODE_READ_BLOCK_REQUEST:
694 case TCODE_LOCK_MASK_SWAP:
695 case TCODE_LOCK_COMPARE_SWAP:
696 case TCODE_LOCK_FETCH_ADD:
697 case TCODE_LOCK_LITTLE_ADD:
698 case TCODE_LOCK_BOUNDED_ADD:
699 case TCODE_LOCK_WRAP_ADD:
700 case TCODE_LOCK_VENDOR_DEPENDENT:
701 break;
702 default:
703 return -EINVAL;
704 }
705
706 return init_request(client, &arg->send_request, client->device->node_id,
707 client->device->max_speed);
708}
709
710static void release_request(struct client *client,
711 struct client_resource *resource)
712{
713 struct inbound_transaction_resource *r = to_inbound_transaction_resource(resource);
714
715 if (r->is_fcp)
716 fw_request_put(r->request);
717 else
718 fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR);
719
720 fw_card_put(r->card);
721 kfree(r);
722}
723
724static void handle_request(struct fw_card *card, struct fw_request *request,
725 int tcode, int destination, int source,
726 int generation, unsigned long long offset,
727 void *payload, size_t length, void *callback_data)
728{
729 struct address_handler_resource *handler = callback_data;
730 bool is_fcp = is_in_fcp_region(offset, length);
731 struct inbound_transaction_resource *r;
732 struct inbound_transaction_event *e;
733 size_t event_size0;
734 int ret;
735
736 /* card may be different from handler->client->device->card */
737 fw_card_get(card);
738
739 // Extend the lifetime of data for request so that its payload is safely accessible in
740 // the process context for the client.
741 if (is_fcp)
742 fw_request_get(request);
743
744 r = kmalloc(sizeof(*r), GFP_ATOMIC);
745 e = kmalloc(sizeof(*e), GFP_ATOMIC);
746 if (r == NULL || e == NULL)
747 goto failed;
748
749 r->card = card;
750 r->request = request;
751 r->is_fcp = is_fcp;
752 r->data = payload;
753 r->length = length;
754
755 r->resource.release = release_request;
756 ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
757 if (ret < 0)
758 goto failed;
759
760 if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) {
761 struct fw_cdev_event_request *req = &e->req.request;
762
763 if (tcode & 0x10)
764 tcode = TCODE_LOCK_REQUEST;
765
766 req->type = FW_CDEV_EVENT_REQUEST;
767 req->tcode = tcode;
768 req->offset = offset;
769 req->length = length;
770 req->handle = r->resource.handle;
771 req->closure = handler->closure;
772 event_size0 = sizeof(*req);
773 } else if (handler->client->version < FW_CDEV_VERSION_EVENT_ASYNC_TSTAMP) {
774 struct fw_cdev_event_request2 *req = &e->req.request2;
775
776 req->type = FW_CDEV_EVENT_REQUEST2;
777 req->tcode = tcode;
778 req->offset = offset;
779 req->source_node_id = source;
780 req->destination_node_id = destination;
781 req->card = card->index;
782 req->generation = generation;
783 req->length = length;
784 req->handle = r->resource.handle;
785 req->closure = handler->closure;
786 event_size0 = sizeof(*req);
787 } else {
788 struct fw_cdev_event_request3 *req = &e->req.with_tstamp;
789
790 req->type = FW_CDEV_EVENT_REQUEST3;
791 req->tcode = tcode;
792 req->offset = offset;
793 req->source_node_id = source;
794 req->destination_node_id = destination;
795 req->card = card->index;
796 req->generation = generation;
797 req->length = length;
798 req->handle = r->resource.handle;
799 req->closure = handler->closure;
800 req->tstamp = fw_request_get_timestamp(request);
801 event_size0 = sizeof(*req);
802 }
803
804 queue_event(handler->client, &e->event,
805 &e->req, event_size0, r->data, length);
806 return;
807
808 failed:
809 kfree(r);
810 kfree(e);
811
812 if (!is_fcp)
813 fw_send_response(card, request, RCODE_CONFLICT_ERROR);
814 else
815 fw_request_put(request);
816
817 fw_card_put(card);
818}
819
820static void release_address_handler(struct client *client,
821 struct client_resource *resource)
822{
823 struct address_handler_resource *r = to_address_handler_resource(resource);
824
825 fw_core_remove_address_handler(&r->handler);
826 kfree(r);
827}
828
829static int ioctl_allocate(struct client *client, union ioctl_arg *arg)
830{
831 struct fw_cdev_allocate *a = &arg->allocate;
832 struct address_handler_resource *r;
833 struct fw_address_region region;
834 int ret;
835
836 r = kmalloc(sizeof(*r), GFP_KERNEL);
837 if (r == NULL)
838 return -ENOMEM;
839
840 region.start = a->offset;
841 if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END)
842 region.end = a->offset + a->length;
843 else
844 region.end = a->region_end;
845
846 r->handler.length = a->length;
847 r->handler.address_callback = handle_request;
848 r->handler.callback_data = r;
849 r->closure = a->closure;
850 r->client = client;
851
852 ret = fw_core_add_address_handler(&r->handler, ®ion);
853 if (ret < 0) {
854 kfree(r);
855 return ret;
856 }
857 a->offset = r->handler.offset;
858
859 r->resource.release = release_address_handler;
860 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
861 if (ret < 0) {
862 release_address_handler(client, &r->resource);
863 return ret;
864 }
865 a->handle = r->resource.handle;
866
867 return 0;
868}
869
870static int ioctl_deallocate(struct client *client, union ioctl_arg *arg)
871{
872 return release_client_resource(client, arg->deallocate.handle,
873 release_address_handler, NULL);
874}
875
876static int ioctl_send_response(struct client *client, union ioctl_arg *arg)
877{
878 struct fw_cdev_send_response *a = &arg->send_response;
879 struct client_resource *resource;
880 struct inbound_transaction_resource *r;
881 int ret = 0;
882
883 if (release_client_resource(client, a->handle,
884 release_request, &resource) < 0)
885 return -EINVAL;
886
887 r = to_inbound_transaction_resource(resource);
888 if (r->is_fcp) {
889 fw_request_put(r->request);
890 goto out;
891 }
892
893 if (a->length != fw_get_response_length(r->request)) {
894 ret = -EINVAL;
895 fw_request_put(r->request);
896 goto out;
897 }
898 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) {
899 ret = -EFAULT;
900 fw_request_put(r->request);
901 goto out;
902 }
903 fw_send_response(r->card, r->request, a->rcode);
904 out:
905 fw_card_put(r->card);
906 kfree(r);
907
908 return ret;
909}
910
911static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg)
912{
913 fw_schedule_bus_reset(client->device->card, true,
914 arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET);
915 return 0;
916}
917
918static void release_descriptor(struct client *client,
919 struct client_resource *resource)
920{
921 struct descriptor_resource *r = to_descriptor_resource(resource);
922
923 fw_core_remove_descriptor(&r->descriptor);
924 kfree(r);
925}
926
927static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg)
928{
929 struct fw_cdev_add_descriptor *a = &arg->add_descriptor;
930 struct descriptor_resource *r;
931 int ret;
932
933 /* Access policy: Allow this ioctl only on local nodes' device files. */
934 if (!client->device->is_local)
935 return -ENOSYS;
936
937 if (a->length > 256)
938 return -EINVAL;
939
940 r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL);
941 if (r == NULL)
942 return -ENOMEM;
943
944 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) {
945 ret = -EFAULT;
946 goto failed;
947 }
948
949 r->descriptor.length = a->length;
950 r->descriptor.immediate = a->immediate;
951 r->descriptor.key = a->key;
952 r->descriptor.data = r->data;
953
954 ret = fw_core_add_descriptor(&r->descriptor);
955 if (ret < 0)
956 goto failed;
957
958 r->resource.release = release_descriptor;
959 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
960 if (ret < 0) {
961 fw_core_remove_descriptor(&r->descriptor);
962 goto failed;
963 }
964 a->handle = r->resource.handle;
965
966 return 0;
967 failed:
968 kfree(r);
969
970 return ret;
971}
972
973static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg)
974{
975 return release_client_resource(client, arg->remove_descriptor.handle,
976 release_descriptor, NULL);
977}
978
979static void iso_callback(struct fw_iso_context *context, u32 cycle,
980 size_t header_length, void *header, void *data)
981{
982 struct client *client = data;
983 struct iso_interrupt_event *e;
984
985 e = kmalloc(sizeof(*e) + header_length, GFP_KERNEL);
986 if (e == NULL)
987 return;
988
989 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
990 e->interrupt.closure = client->iso_closure;
991 e->interrupt.cycle = cycle;
992 e->interrupt.header_length = header_length;
993 memcpy(e->interrupt.header, header, header_length);
994 queue_event(client, &e->event, &e->interrupt,
995 sizeof(e->interrupt) + header_length, NULL, 0);
996}
997
998static void iso_mc_callback(struct fw_iso_context *context,
999 dma_addr_t completed, void *data)
1000{
1001 struct client *client = data;
1002 struct iso_interrupt_mc_event *e;
1003
1004 e = kmalloc(sizeof(*e), GFP_KERNEL);
1005 if (e == NULL)
1006 return;
1007
1008 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL;
1009 e->interrupt.closure = client->iso_closure;
1010 e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer,
1011 completed);
1012 queue_event(client, &e->event, &e->interrupt,
1013 sizeof(e->interrupt), NULL, 0);
1014}
1015
1016static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context)
1017{
1018 if (context->type == FW_ISO_CONTEXT_TRANSMIT)
1019 return DMA_TO_DEVICE;
1020 else
1021 return DMA_FROM_DEVICE;
1022}
1023
1024static struct fw_iso_context *fw_iso_mc_context_create(struct fw_card *card,
1025 fw_iso_mc_callback_t callback,
1026 void *callback_data)
1027{
1028 struct fw_iso_context *ctx;
1029
1030 ctx = fw_iso_context_create(card, FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL,
1031 0, 0, 0, NULL, callback_data);
1032 if (!IS_ERR(ctx))
1033 ctx->callback.mc = callback;
1034
1035 return ctx;
1036}
1037
1038static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
1039{
1040 struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
1041 struct fw_iso_context *context;
1042 union fw_iso_callback cb;
1043 int ret;
1044
1045 BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||
1046 FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE ||
1047 FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL !=
1048 FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL);
1049
1050 switch (a->type) {
1051 case FW_ISO_CONTEXT_TRANSMIT:
1052 if (a->speed > SCODE_3200 || a->channel > 63)
1053 return -EINVAL;
1054
1055 cb.sc = iso_callback;
1056 break;
1057
1058 case FW_ISO_CONTEXT_RECEIVE:
1059 if (a->header_size < 4 || (a->header_size & 3) ||
1060 a->channel > 63)
1061 return -EINVAL;
1062
1063 cb.sc = iso_callback;
1064 break;
1065
1066 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
1067 cb.mc = iso_mc_callback;
1068 break;
1069
1070 default:
1071 return -EINVAL;
1072 }
1073
1074 if (a->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
1075 context = fw_iso_mc_context_create(client->device->card, cb.mc,
1076 client);
1077 else
1078 context = fw_iso_context_create(client->device->card, a->type,
1079 a->channel, a->speed,
1080 a->header_size, cb.sc, client);
1081 if (IS_ERR(context))
1082 return PTR_ERR(context);
1083 if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW)
1084 context->drop_overflow_headers = true;
1085
1086 // We only support one context at this time.
1087 guard(spinlock_irq)(&client->lock);
1088
1089 if (client->iso_context != NULL) {
1090 fw_iso_context_destroy(context);
1091
1092 return -EBUSY;
1093 }
1094 if (!client->buffer_is_mapped) {
1095 ret = fw_iso_buffer_map_dma(&client->buffer,
1096 client->device->card,
1097 iso_dma_direction(context));
1098 if (ret < 0) {
1099 fw_iso_context_destroy(context);
1100
1101 return ret;
1102 }
1103 client->buffer_is_mapped = true;
1104 }
1105 client->iso_closure = a->closure;
1106 client->iso_context = context;
1107
1108 a->handle = 0;
1109
1110 return 0;
1111}
1112
1113static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg)
1114{
1115 struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels;
1116 struct fw_iso_context *ctx = client->iso_context;
1117
1118 if (ctx == NULL || a->handle != 0)
1119 return -EINVAL;
1120
1121 return fw_iso_context_set_channels(ctx, &a->channels);
1122}
1123
1124/* Macros for decoding the iso packet control header. */
1125#define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff)
1126#define GET_INTERRUPT(v) (((v) >> 16) & 0x01)
1127#define GET_SKIP(v) (((v) >> 17) & 0x01)
1128#define GET_TAG(v) (((v) >> 18) & 0x03)
1129#define GET_SY(v) (((v) >> 20) & 0x0f)
1130#define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff)
1131
1132static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
1133{
1134 struct fw_cdev_queue_iso *a = &arg->queue_iso;
1135 struct fw_cdev_iso_packet __user *p, *end, *next;
1136 struct fw_iso_context *ctx = client->iso_context;
1137 unsigned long payload, buffer_end, transmit_header_bytes = 0;
1138 u32 control;
1139 int count;
1140 struct {
1141 struct fw_iso_packet packet;
1142 u8 header[256];
1143 } u;
1144
1145 if (ctx == NULL || a->handle != 0)
1146 return -EINVAL;
1147
1148 /*
1149 * If the user passes a non-NULL data pointer, has mmap()'ed
1150 * the iso buffer, and the pointer points inside the buffer,
1151 * we setup the payload pointers accordingly. Otherwise we
1152 * set them both to 0, which will still let packets with
1153 * payload_length == 0 through. In other words, if no packets
1154 * use the indirect payload, the iso buffer need not be mapped
1155 * and the a->data pointer is ignored.
1156 */
1157 payload = (unsigned long)a->data - client->vm_start;
1158 buffer_end = client->buffer.page_count << PAGE_SHIFT;
1159 if (a->data == 0 || client->buffer.pages == NULL ||
1160 payload >= buffer_end) {
1161 payload = 0;
1162 buffer_end = 0;
1163 }
1164
1165 if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3)
1166 return -EINVAL;
1167
1168 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);
1169
1170 end = (void __user *)p + a->size;
1171 count = 0;
1172 while (p < end) {
1173 if (get_user(control, &p->control))
1174 return -EFAULT;
1175 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
1176 u.packet.interrupt = GET_INTERRUPT(control);
1177 u.packet.skip = GET_SKIP(control);
1178 u.packet.tag = GET_TAG(control);
1179 u.packet.sy = GET_SY(control);
1180 u.packet.header_length = GET_HEADER_LENGTH(control);
1181
1182 switch (ctx->type) {
1183 case FW_ISO_CONTEXT_TRANSMIT:
1184 if (u.packet.header_length & 3)
1185 return -EINVAL;
1186 transmit_header_bytes = u.packet.header_length;
1187 break;
1188
1189 case FW_ISO_CONTEXT_RECEIVE:
1190 if (u.packet.header_length == 0 ||
1191 u.packet.header_length % ctx->header_size != 0)
1192 return -EINVAL;
1193 break;
1194
1195 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
1196 if (u.packet.payload_length == 0 ||
1197 u.packet.payload_length & 3)
1198 return -EINVAL;
1199 break;
1200 }
1201
1202 next = (struct fw_cdev_iso_packet __user *)
1203 &p->header[transmit_header_bytes / 4];
1204 if (next > end)
1205 return -EINVAL;
1206 if (copy_from_user
1207 (u.packet.header, p->header, transmit_header_bytes))
1208 return -EFAULT;
1209 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
1210 u.packet.header_length + u.packet.payload_length > 0)
1211 return -EINVAL;
1212 if (payload + u.packet.payload_length > buffer_end)
1213 return -EINVAL;
1214
1215 if (fw_iso_context_queue(ctx, &u.packet,
1216 &client->buffer, payload))
1217 break;
1218
1219 p = next;
1220 payload += u.packet.payload_length;
1221 count++;
1222 }
1223 fw_iso_context_queue_flush(ctx);
1224
1225 a->size -= uptr_to_u64(p) - a->packets;
1226 a->packets = uptr_to_u64(p);
1227 a->data = client->vm_start + payload;
1228
1229 return count;
1230}
1231
1232static int ioctl_start_iso(struct client *client, union ioctl_arg *arg)
1233{
1234 struct fw_cdev_start_iso *a = &arg->start_iso;
1235
1236 BUILD_BUG_ON(
1237 FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 ||
1238 FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 ||
1239 FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 ||
1240 FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 ||
1241 FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS);
1242
1243 if (client->iso_context == NULL || a->handle != 0)
1244 return -EINVAL;
1245
1246 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE &&
1247 (a->tags == 0 || a->tags > 15 || a->sync > 15))
1248 return -EINVAL;
1249
1250 return fw_iso_context_start(client->iso_context,
1251 a->cycle, a->sync, a->tags);
1252}
1253
1254static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg)
1255{
1256 struct fw_cdev_stop_iso *a = &arg->stop_iso;
1257
1258 if (client->iso_context == NULL || a->handle != 0)
1259 return -EINVAL;
1260
1261 return fw_iso_context_stop(client->iso_context);
1262}
1263
1264static int ioctl_flush_iso(struct client *client, union ioctl_arg *arg)
1265{
1266 struct fw_cdev_flush_iso *a = &arg->flush_iso;
1267
1268 if (client->iso_context == NULL || a->handle != 0)
1269 return -EINVAL;
1270
1271 return fw_iso_context_flush_completions(client->iso_context);
1272}
1273
1274static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg)
1275{
1276 struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2;
1277 struct fw_card *card = client->device->card;
1278 struct timespec64 ts = {0, 0};
1279 u32 cycle_time = 0;
1280 int ret;
1281
1282 guard(irq)();
1283
1284 ret = fw_card_read_cycle_time(card, &cycle_time);
1285 if (ret < 0)
1286 return ret;
1287
1288 switch (a->clk_id) {
1289 case CLOCK_REALTIME: ktime_get_real_ts64(&ts); break;
1290 case CLOCK_MONOTONIC: ktime_get_ts64(&ts); break;
1291 case CLOCK_MONOTONIC_RAW: ktime_get_raw_ts64(&ts); break;
1292 default:
1293 return -EINVAL;
1294 }
1295
1296 a->tv_sec = ts.tv_sec;
1297 a->tv_nsec = ts.tv_nsec;
1298 a->cycle_timer = cycle_time;
1299
1300 return 0;
1301}
1302
1303static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg)
1304{
1305 struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer;
1306 struct fw_cdev_get_cycle_timer2 ct2;
1307
1308 ct2.clk_id = CLOCK_REALTIME;
1309 ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2);
1310
1311 a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC;
1312 a->cycle_timer = ct2.cycle_timer;
1313
1314 return 0;
1315}
1316
1317static void iso_resource_work(struct work_struct *work)
1318{
1319 struct iso_resource_event *e;
1320 struct iso_resource *r =
1321 container_of(work, struct iso_resource, work.work);
1322 struct client *client = r->client;
1323 unsigned long index = r->resource.handle;
1324 int generation, channel, bandwidth, todo;
1325 bool skip, free, success;
1326
1327 scoped_guard(spinlock_irq, &client->lock) {
1328 generation = client->device->generation;
1329 todo = r->todo;
1330 // Allow 1000ms grace period for other reallocations.
1331 if (todo == ISO_RES_ALLOC &&
1332 time_before64(get_jiffies_64(), client->device->card->reset_jiffies + HZ)) {
1333 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
1334 skip = true;
1335 } else {
1336 // We could be called twice within the same generation.
1337 skip = todo == ISO_RES_REALLOC &&
1338 r->generation == generation;
1339 }
1340 free = todo == ISO_RES_DEALLOC ||
1341 todo == ISO_RES_ALLOC_ONCE ||
1342 todo == ISO_RES_DEALLOC_ONCE;
1343 r->generation = generation;
1344 }
1345
1346 if (skip)
1347 goto out;
1348
1349 bandwidth = r->bandwidth;
1350
1351 fw_iso_resource_manage(client->device->card, generation,
1352 r->channels, &channel, &bandwidth,
1353 todo == ISO_RES_ALLOC ||
1354 todo == ISO_RES_REALLOC ||
1355 todo == ISO_RES_ALLOC_ONCE);
1356 /*
1357 * Is this generation outdated already? As long as this resource sticks
1358 * in the xarray, it will be scheduled again for a newer generation or at
1359 * shutdown.
1360 */
1361 if (channel == -EAGAIN &&
1362 (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1363 goto out;
1364
1365 success = channel >= 0 || bandwidth > 0;
1366
1367 scoped_guard(spinlock_irq, &client->lock) {
1368 // Transit from allocation to reallocation, except if the client
1369 // requested deallocation in the meantime.
1370 if (r->todo == ISO_RES_ALLOC)
1371 r->todo = ISO_RES_REALLOC;
1372 // Allocation or reallocation failure? Pull this resource out of the
1373 // xarray and prepare for deletion, unless the client is shutting down.
1374 if (r->todo == ISO_RES_REALLOC && !success &&
1375 !client->in_shutdown &&
1376 xa_erase(&client->resource_xa, index)) {
1377 client_put(client);
1378 free = true;
1379 }
1380 }
1381
1382 if (todo == ISO_RES_ALLOC && channel >= 0)
1383 r->channels = 1ULL << channel;
1384
1385 if (todo == ISO_RES_REALLOC && success)
1386 goto out;
1387
1388 if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1389 e = r->e_alloc;
1390 r->e_alloc = NULL;
1391 } else {
1392 e = r->e_dealloc;
1393 r->e_dealloc = NULL;
1394 }
1395 e->iso_resource.handle = r->resource.handle;
1396 e->iso_resource.channel = channel;
1397 e->iso_resource.bandwidth = bandwidth;
1398
1399 queue_event(client, &e->event,
1400 &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
1401
1402 if (free) {
1403 cancel_delayed_work(&r->work);
1404 kfree(r->e_alloc);
1405 kfree(r->e_dealloc);
1406 kfree(r);
1407 }
1408 out:
1409 client_put(client);
1410}
1411
1412static void release_iso_resource(struct client *client,
1413 struct client_resource *resource)
1414{
1415 struct iso_resource *r = to_iso_resource(resource);
1416
1417 guard(spinlock_irq)(&client->lock);
1418
1419 r->todo = ISO_RES_DEALLOC;
1420 schedule_iso_resource(r, 0);
1421}
1422
1423static int init_iso_resource(struct client *client,
1424 struct fw_cdev_allocate_iso_resource *request, int todo)
1425{
1426 struct iso_resource_event *e1, *e2;
1427 struct iso_resource *r;
1428 int ret;
1429
1430 if ((request->channels == 0 && request->bandwidth == 0) ||
1431 request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL)
1432 return -EINVAL;
1433
1434 r = kmalloc(sizeof(*r), GFP_KERNEL);
1435 e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1436 e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1437 if (r == NULL || e1 == NULL || e2 == NULL) {
1438 ret = -ENOMEM;
1439 goto fail;
1440 }
1441
1442 INIT_DELAYED_WORK(&r->work, iso_resource_work);
1443 r->client = client;
1444 r->todo = todo;
1445 r->generation = -1;
1446 r->channels = request->channels;
1447 r->bandwidth = request->bandwidth;
1448 r->e_alloc = e1;
1449 r->e_dealloc = e2;
1450
1451 e1->iso_resource.closure = request->closure;
1452 e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1453 e2->iso_resource.closure = request->closure;
1454 e2->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1455
1456 if (todo == ISO_RES_ALLOC) {
1457 r->resource.release = release_iso_resource;
1458 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1459 if (ret < 0)
1460 goto fail;
1461 } else {
1462 r->resource.release = NULL;
1463 r->resource.handle = -1;
1464 schedule_iso_resource(r, 0);
1465 }
1466 request->handle = r->resource.handle;
1467
1468 return 0;
1469 fail:
1470 kfree(r);
1471 kfree(e1);
1472 kfree(e2);
1473
1474 return ret;
1475}
1476
1477static int ioctl_allocate_iso_resource(struct client *client,
1478 union ioctl_arg *arg)
1479{
1480 return init_iso_resource(client,
1481 &arg->allocate_iso_resource, ISO_RES_ALLOC);
1482}
1483
1484static int ioctl_deallocate_iso_resource(struct client *client,
1485 union ioctl_arg *arg)
1486{
1487 return release_client_resource(client,
1488 arg->deallocate.handle, release_iso_resource, NULL);
1489}
1490
1491static int ioctl_allocate_iso_resource_once(struct client *client,
1492 union ioctl_arg *arg)
1493{
1494 return init_iso_resource(client,
1495 &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE);
1496}
1497
1498static int ioctl_deallocate_iso_resource_once(struct client *client,
1499 union ioctl_arg *arg)
1500{
1501 return init_iso_resource(client,
1502 &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE);
1503}
1504
1505/*
1506 * Returns a speed code: Maximum speed to or from this device,
1507 * limited by the device's link speed, the local node's link speed,
1508 * and all PHY port speeds between the two links.
1509 */
1510static int ioctl_get_speed(struct client *client, union ioctl_arg *arg)
1511{
1512 return client->device->max_speed;
1513}
1514
1515static int ioctl_send_broadcast_request(struct client *client,
1516 union ioctl_arg *arg)
1517{
1518 struct fw_cdev_send_request *a = &arg->send_request;
1519
1520 switch (a->tcode) {
1521 case TCODE_WRITE_QUADLET_REQUEST:
1522 case TCODE_WRITE_BLOCK_REQUEST:
1523 break;
1524 default:
1525 return -EINVAL;
1526 }
1527
1528 /* Security policy: Only allow accesses to Units Space. */
1529 if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1530 return -EACCES;
1531
1532 return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100);
1533}
1534
1535static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg)
1536{
1537 struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet;
1538 struct fw_cdev_send_request request;
1539 int dest;
1540
1541 if (a->speed > client->device->card->link_speed ||
1542 a->length > 1024 << a->speed)
1543 return -EIO;
1544
1545 if (a->tag > 3 || a->channel > 63 || a->sy > 15)
1546 return -EINVAL;
1547
1548 dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy);
1549 request.tcode = TCODE_STREAM_DATA;
1550 request.length = a->length;
1551 request.closure = a->closure;
1552 request.data = a->data;
1553 request.generation = a->generation;
1554
1555 return init_request(client, &request, dest, a->speed);
1556}
1557
1558static void outbound_phy_packet_callback(struct fw_packet *packet,
1559 struct fw_card *card, int status)
1560{
1561 struct outbound_phy_packet_event *e =
1562 container_of(packet, struct outbound_phy_packet_event, p);
1563 struct client *e_client = e->client;
1564 u32 rcode;
1565
1566 trace_async_phy_outbound_complete((uintptr_t)packet, card->index, status, packet->generation,
1567 packet->timestamp);
1568
1569 switch (status) {
1570 // expected:
1571 case ACK_COMPLETE:
1572 rcode = RCODE_COMPLETE;
1573 break;
1574 // should never happen with PHY packets:
1575 case ACK_PENDING:
1576 rcode = RCODE_COMPLETE;
1577 break;
1578 case ACK_BUSY_X:
1579 case ACK_BUSY_A:
1580 case ACK_BUSY_B:
1581 rcode = RCODE_BUSY;
1582 break;
1583 case ACK_DATA_ERROR:
1584 rcode = RCODE_DATA_ERROR;
1585 break;
1586 case ACK_TYPE_ERROR:
1587 rcode = RCODE_TYPE_ERROR;
1588 break;
1589 // stale generation; cancelled; on certain controllers: no ack
1590 default:
1591 rcode = status;
1592 break;
1593 }
1594
1595 switch (e->phy_packet.without_tstamp.type) {
1596 case FW_CDEV_EVENT_PHY_PACKET_SENT:
1597 {
1598 struct fw_cdev_event_phy_packet *pp = &e->phy_packet.without_tstamp;
1599
1600 pp->rcode = rcode;
1601 pp->data[0] = packet->timestamp;
1602 queue_event(e->client, &e->event, &e->phy_packet, sizeof(*pp) + pp->length,
1603 NULL, 0);
1604 break;
1605 }
1606 case FW_CDEV_EVENT_PHY_PACKET_SENT2:
1607 {
1608 struct fw_cdev_event_phy_packet2 *pp = &e->phy_packet.with_tstamp;
1609
1610 pp->rcode = rcode;
1611 pp->tstamp = packet->timestamp;
1612 queue_event(e->client, &e->event, &e->phy_packet, sizeof(*pp) + pp->length,
1613 NULL, 0);
1614 break;
1615 }
1616 default:
1617 WARN_ON(1);
1618 break;
1619 }
1620
1621 client_put(e_client);
1622}
1623
1624static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg)
1625{
1626 struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet;
1627 struct fw_card *card = client->device->card;
1628 struct outbound_phy_packet_event *e;
1629
1630 /* Access policy: Allow this ioctl only on local nodes' device files. */
1631 if (!client->device->is_local)
1632 return -ENOSYS;
1633
1634 e = kzalloc(sizeof(*e) + sizeof(a->data), GFP_KERNEL);
1635 if (e == NULL)
1636 return -ENOMEM;
1637
1638 client_get(client);
1639 e->client = client;
1640 e->p.speed = SCODE_100;
1641 e->p.generation = a->generation;
1642 async_header_set_tcode(e->p.header, TCODE_LINK_INTERNAL);
1643 e->p.header[1] = a->data[0];
1644 e->p.header[2] = a->data[1];
1645 e->p.header_length = 12;
1646 e->p.callback = outbound_phy_packet_callback;
1647
1648 if (client->version < FW_CDEV_VERSION_EVENT_ASYNC_TSTAMP) {
1649 struct fw_cdev_event_phy_packet *pp = &e->phy_packet.without_tstamp;
1650
1651 pp->closure = a->closure;
1652 pp->type = FW_CDEV_EVENT_PHY_PACKET_SENT;
1653 if (is_ping_packet(a->data))
1654 pp->length = 4;
1655 } else {
1656 struct fw_cdev_event_phy_packet2 *pp = &e->phy_packet.with_tstamp;
1657
1658 pp->closure = a->closure;
1659 pp->type = FW_CDEV_EVENT_PHY_PACKET_SENT2;
1660 // Keep the data field so that application can match the response event to the
1661 // request.
1662 pp->length = sizeof(a->data);
1663 memcpy(pp->data, a->data, sizeof(a->data));
1664 }
1665
1666 trace_async_phy_outbound_initiate((uintptr_t)&e->p, card->index, e->p.generation,
1667 e->p.header[1], e->p.header[2]);
1668
1669 card->driver->send_request(card, &e->p);
1670
1671 return 0;
1672}
1673
1674static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg)
1675{
1676 struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets;
1677 struct fw_card *card = client->device->card;
1678
1679 /* Access policy: Allow this ioctl only on local nodes' device files. */
1680 if (!client->device->is_local)
1681 return -ENOSYS;
1682
1683 guard(spinlock_irq)(&card->lock);
1684
1685 list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list);
1686 client->phy_receiver_closure = a->closure;
1687
1688 return 0;
1689}
1690
1691void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p)
1692{
1693 struct client *client;
1694
1695 guard(spinlock_irqsave)(&card->lock);
1696
1697 list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) {
1698 struct inbound_phy_packet_event *e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC);
1699 if (e == NULL)
1700 break;
1701
1702 if (client->version < FW_CDEV_VERSION_EVENT_ASYNC_TSTAMP) {
1703 struct fw_cdev_event_phy_packet *pp = &e->phy_packet.without_tstamp;
1704
1705 pp->closure = client->phy_receiver_closure;
1706 pp->type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED;
1707 pp->rcode = RCODE_COMPLETE;
1708 pp->length = 8;
1709 pp->data[0] = p->header[1];
1710 pp->data[1] = p->header[2];
1711 queue_event(client, &e->event, &e->phy_packet, sizeof(*pp) + 8, NULL, 0);
1712 } else {
1713 struct fw_cdev_event_phy_packet2 *pp = &e->phy_packet.with_tstamp;
1714
1715 pp = &e->phy_packet.with_tstamp;
1716 pp->closure = client->phy_receiver_closure;
1717 pp->type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED2;
1718 pp->rcode = RCODE_COMPLETE;
1719 pp->length = 8;
1720 pp->tstamp = p->timestamp;
1721 pp->data[0] = p->header[1];
1722 pp->data[1] = p->header[2];
1723 queue_event(client, &e->event, &e->phy_packet, sizeof(*pp) + 8, NULL, 0);
1724 }
1725 }
1726}
1727
1728static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = {
1729 [0x00] = ioctl_get_info,
1730 [0x01] = ioctl_send_request,
1731 [0x02] = ioctl_allocate,
1732 [0x03] = ioctl_deallocate,
1733 [0x04] = ioctl_send_response,
1734 [0x05] = ioctl_initiate_bus_reset,
1735 [0x06] = ioctl_add_descriptor,
1736 [0x07] = ioctl_remove_descriptor,
1737 [0x08] = ioctl_create_iso_context,
1738 [0x09] = ioctl_queue_iso,
1739 [0x0a] = ioctl_start_iso,
1740 [0x0b] = ioctl_stop_iso,
1741 [0x0c] = ioctl_get_cycle_timer,
1742 [0x0d] = ioctl_allocate_iso_resource,
1743 [0x0e] = ioctl_deallocate_iso_resource,
1744 [0x0f] = ioctl_allocate_iso_resource_once,
1745 [0x10] = ioctl_deallocate_iso_resource_once,
1746 [0x11] = ioctl_get_speed,
1747 [0x12] = ioctl_send_broadcast_request,
1748 [0x13] = ioctl_send_stream_packet,
1749 [0x14] = ioctl_get_cycle_timer2,
1750 [0x15] = ioctl_send_phy_packet,
1751 [0x16] = ioctl_receive_phy_packets,
1752 [0x17] = ioctl_set_iso_channels,
1753 [0x18] = ioctl_flush_iso,
1754};
1755
1756static int dispatch_ioctl(struct client *client,
1757 unsigned int cmd, void __user *arg)
1758{
1759 union ioctl_arg buffer;
1760 int ret;
1761
1762 if (fw_device_is_shutdown(client->device))
1763 return -ENODEV;
1764
1765 if (_IOC_TYPE(cmd) != '#' ||
1766 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) ||
1767 _IOC_SIZE(cmd) > sizeof(buffer))
1768 return -ENOTTY;
1769
1770 memset(&buffer, 0, sizeof(buffer));
1771
1772 if (_IOC_DIR(cmd) & _IOC_WRITE)
1773 if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd)))
1774 return -EFAULT;
1775
1776 ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer);
1777 if (ret < 0)
1778 return ret;
1779
1780 if (_IOC_DIR(cmd) & _IOC_READ)
1781 if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd)))
1782 return -EFAULT;
1783
1784 return ret;
1785}
1786
1787static long fw_device_op_ioctl(struct file *file,
1788 unsigned int cmd, unsigned long arg)
1789{
1790 return dispatch_ioctl(file->private_data, cmd, (void __user *)arg);
1791}
1792
1793static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1794{
1795 struct client *client = file->private_data;
1796 unsigned long size;
1797 int page_count, ret;
1798
1799 if (fw_device_is_shutdown(client->device))
1800 return -ENODEV;
1801
1802 /* FIXME: We could support multiple buffers, but we don't. */
1803 if (client->buffer.pages != NULL)
1804 return -EBUSY;
1805
1806 if (!(vma->vm_flags & VM_SHARED))
1807 return -EINVAL;
1808
1809 if (vma->vm_start & ~PAGE_MASK)
1810 return -EINVAL;
1811
1812 client->vm_start = vma->vm_start;
1813 size = vma->vm_end - vma->vm_start;
1814 page_count = size >> PAGE_SHIFT;
1815 if (size & ~PAGE_MASK)
1816 return -EINVAL;
1817
1818 ret = fw_iso_buffer_alloc(&client->buffer, page_count);
1819 if (ret < 0)
1820 return ret;
1821
1822 scoped_guard(spinlock_irq, &client->lock) {
1823 if (client->iso_context) {
1824 ret = fw_iso_buffer_map_dma(&client->buffer, client->device->card,
1825 iso_dma_direction(client->iso_context));
1826 if (ret < 0)
1827 goto fail;
1828 client->buffer_is_mapped = true;
1829 }
1830 }
1831
1832 ret = vm_map_pages_zero(vma, client->buffer.pages,
1833 client->buffer.page_count);
1834 if (ret < 0)
1835 goto fail;
1836
1837 return 0;
1838 fail:
1839 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1840 return ret;
1841}
1842
1843static bool has_outbound_transactions(struct client *client)
1844{
1845 struct client_resource *resource;
1846 unsigned long index;
1847
1848 guard(spinlock_irq)(&client->lock);
1849
1850 xa_for_each(&client->resource_xa, index, resource) {
1851 if (is_outbound_transaction_resource(resource))
1852 return true;
1853 }
1854
1855 return false;
1856}
1857
1858static int fw_device_op_release(struct inode *inode, struct file *file)
1859{
1860 struct client *client = file->private_data;
1861 struct event *event, *next_event;
1862 struct client_resource *resource;
1863 unsigned long index;
1864
1865 scoped_guard(spinlock_irq, &client->device->card->lock)
1866 list_del(&client->phy_receiver_link);
1867
1868 scoped_guard(mutex, &client->device->client_list_mutex)
1869 list_del(&client->link);
1870
1871 if (client->iso_context)
1872 fw_iso_context_destroy(client->iso_context);
1873
1874 if (client->buffer.pages)
1875 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1876
1877 // Freeze client->resource_xa and client->event_list.
1878 scoped_guard(spinlock_irq, &client->lock)
1879 client->in_shutdown = true;
1880
1881 wait_event(client->tx_flush_wait, !has_outbound_transactions(client));
1882
1883 xa_for_each(&client->resource_xa, index, resource) {
1884 resource->release(client, resource);
1885 client_put(client);
1886 }
1887 xa_destroy(&client->resource_xa);
1888
1889 list_for_each_entry_safe(event, next_event, &client->event_list, link)
1890 kfree(event);
1891
1892 client_put(client);
1893
1894 return 0;
1895}
1896
1897static __poll_t fw_device_op_poll(struct file *file, poll_table * pt)
1898{
1899 struct client *client = file->private_data;
1900 __poll_t mask = 0;
1901
1902 poll_wait(file, &client->wait, pt);
1903
1904 if (fw_device_is_shutdown(client->device))
1905 mask |= EPOLLHUP | EPOLLERR;
1906 if (!list_empty(&client->event_list))
1907 mask |= EPOLLIN | EPOLLRDNORM;
1908
1909 return mask;
1910}
1911
1912const struct file_operations fw_device_ops = {
1913 .owner = THIS_MODULE,
1914 .open = fw_device_op_open,
1915 .read = fw_device_op_read,
1916 .unlocked_ioctl = fw_device_op_ioctl,
1917 .mmap = fw_device_op_mmap,
1918 .release = fw_device_op_release,
1919 .poll = fw_device_op_poll,
1920 .compat_ioctl = compat_ptr_ioctl,
1921};