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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Avionic Design GmbH
4 * Copyright (C) 2012-2013, NVIDIA Corporation
5 */
6
7#include <linux/debugfs.h>
8#include <linux/dma-mapping.h>
9#include <linux/host1x.h>
10#include <linux/of.h>
11#include <linux/seq_file.h>
12#include <linux/slab.h>
13#include <linux/of_device.h>
14
15#include "bus.h"
16#include "dev.h"
17
18static DEFINE_MUTEX(clients_lock);
19static LIST_HEAD(clients);
20
21static DEFINE_MUTEX(drivers_lock);
22static LIST_HEAD(drivers);
23
24static DEFINE_MUTEX(devices_lock);
25static LIST_HEAD(devices);
26
27struct host1x_subdev {
28 struct host1x_client *client;
29 struct device_node *np;
30 struct list_head list;
31};
32
33/**
34 * host1x_subdev_add() - add a new subdevice with an associated device node
35 * @device: host1x device to add the subdevice to
36 * @driver: host1x driver containing the subdevices
37 * @np: device node
38 */
39static int host1x_subdev_add(struct host1x_device *device,
40 struct host1x_driver *driver,
41 struct device_node *np)
42{
43 struct host1x_subdev *subdev;
44 struct device_node *child;
45 int err;
46
47 subdev = kzalloc(sizeof(*subdev), GFP_KERNEL);
48 if (!subdev)
49 return -ENOMEM;
50
51 INIT_LIST_HEAD(&subdev->list);
52 subdev->np = of_node_get(np);
53
54 mutex_lock(&device->subdevs_lock);
55 list_add_tail(&subdev->list, &device->subdevs);
56 mutex_unlock(&device->subdevs_lock);
57
58 /* recursively add children */
59 for_each_child_of_node(np, child) {
60 if (of_match_node(driver->subdevs, child) &&
61 of_device_is_available(child)) {
62 err = host1x_subdev_add(device, driver, child);
63 if (err < 0) {
64 /* XXX cleanup? */
65 of_node_put(child);
66 return err;
67 }
68 }
69 }
70
71 return 0;
72}
73
74/**
75 * host1x_subdev_del() - remove subdevice
76 * @subdev: subdevice to remove
77 */
78static void host1x_subdev_del(struct host1x_subdev *subdev)
79{
80 list_del(&subdev->list);
81 of_node_put(subdev->np);
82 kfree(subdev);
83}
84
85/**
86 * host1x_device_parse_dt() - scan device tree and add matching subdevices
87 * @device: host1x logical device
88 * @driver: host1x driver
89 */
90static int host1x_device_parse_dt(struct host1x_device *device,
91 struct host1x_driver *driver)
92{
93 struct device_node *np;
94 int err;
95
96 for_each_child_of_node(device->dev.parent->of_node, np) {
97 if (of_match_node(driver->subdevs, np) &&
98 of_device_is_available(np)) {
99 err = host1x_subdev_add(device, driver, np);
100 if (err < 0) {
101 of_node_put(np);
102 return err;
103 }
104 }
105 }
106
107 return 0;
108}
109
110static void host1x_subdev_register(struct host1x_device *device,
111 struct host1x_subdev *subdev,
112 struct host1x_client *client)
113{
114 int err;
115
116 /*
117 * Move the subdevice to the list of active (registered) subdevices
118 * and associate it with a client. At the same time, associate the
119 * client with its parent device.
120 */
121 mutex_lock(&device->subdevs_lock);
122 mutex_lock(&device->clients_lock);
123 list_move_tail(&client->list, &device->clients);
124 list_move_tail(&subdev->list, &device->active);
125 client->host = &device->dev;
126 subdev->client = client;
127 mutex_unlock(&device->clients_lock);
128 mutex_unlock(&device->subdevs_lock);
129
130 if (list_empty(&device->subdevs)) {
131 err = device_add(&device->dev);
132 if (err < 0)
133 dev_err(&device->dev, "failed to add: %d\n", err);
134 else
135 device->registered = true;
136 }
137}
138
139static void __host1x_subdev_unregister(struct host1x_device *device,
140 struct host1x_subdev *subdev)
141{
142 struct host1x_client *client = subdev->client;
143
144 /*
145 * If all subdevices have been activated, we're about to remove the
146 * first active subdevice, so unload the driver first.
147 */
148 if (list_empty(&device->subdevs)) {
149 if (device->registered) {
150 device->registered = false;
151 device_del(&device->dev);
152 }
153 }
154
155 /*
156 * Move the subdevice back to the list of idle subdevices and remove
157 * it from list of clients.
158 */
159 mutex_lock(&device->clients_lock);
160 subdev->client = NULL;
161 client->host = NULL;
162 list_move_tail(&subdev->list, &device->subdevs);
163 /*
164 * XXX: Perhaps don't do this here, but rather explicitly remove it
165 * when the device is about to be deleted.
166 *
167 * This is somewhat complicated by the fact that this function is
168 * used to remove the subdevice when a client is unregistered but
169 * also when the composite device is about to be removed.
170 */
171 list_del_init(&client->list);
172 mutex_unlock(&device->clients_lock);
173}
174
175static void host1x_subdev_unregister(struct host1x_device *device,
176 struct host1x_subdev *subdev)
177{
178 mutex_lock(&device->subdevs_lock);
179 __host1x_subdev_unregister(device, subdev);
180 mutex_unlock(&device->subdevs_lock);
181}
182
183/**
184 * host1x_device_init() - initialize a host1x logical device
185 * @device: host1x logical device
186 *
187 * The driver for the host1x logical device can call this during execution of
188 * its &host1x_driver.probe implementation to initialize each of its clients.
189 * The client drivers access the subsystem specific driver data using the
190 * &host1x_client.parent field and driver data associated with it (usually by
191 * calling dev_get_drvdata()).
192 */
193int host1x_device_init(struct host1x_device *device)
194{
195 struct host1x_client *client;
196 int err;
197
198 mutex_lock(&device->clients_lock);
199
200 list_for_each_entry(client, &device->clients, list) {
201 if (client->ops && client->ops->early_init) {
202 err = client->ops->early_init(client);
203 if (err < 0) {
204 dev_err(&device->dev, "failed to early initialize %s: %d\n",
205 dev_name(client->dev), err);
206 goto teardown_late;
207 }
208 }
209 }
210
211 list_for_each_entry(client, &device->clients, list) {
212 if (client->ops && client->ops->init) {
213 err = client->ops->init(client);
214 if (err < 0) {
215 dev_err(&device->dev,
216 "failed to initialize %s: %d\n",
217 dev_name(client->dev), err);
218 goto teardown;
219 }
220 }
221 }
222
223 mutex_unlock(&device->clients_lock);
224
225 return 0;
226
227teardown:
228 list_for_each_entry_continue_reverse(client, &device->clients, list)
229 if (client->ops->exit)
230 client->ops->exit(client);
231
232 /* reset client to end of list for late teardown */
233 client = list_entry(&device->clients, struct host1x_client, list);
234
235teardown_late:
236 list_for_each_entry_continue_reverse(client, &device->clients, list)
237 if (client->ops->late_exit)
238 client->ops->late_exit(client);
239
240 mutex_unlock(&device->clients_lock);
241 return err;
242}
243EXPORT_SYMBOL(host1x_device_init);
244
245/**
246 * host1x_device_exit() - uninitialize host1x logical device
247 * @device: host1x logical device
248 *
249 * When the driver for a host1x logical device is unloaded, it can call this
250 * function to tear down each of its clients. Typically this is done after a
251 * subsystem-specific data structure is removed and the functionality can no
252 * longer be used.
253 */
254int host1x_device_exit(struct host1x_device *device)
255{
256 struct host1x_client *client;
257 int err;
258
259 mutex_lock(&device->clients_lock);
260
261 list_for_each_entry_reverse(client, &device->clients, list) {
262 if (client->ops && client->ops->exit) {
263 err = client->ops->exit(client);
264 if (err < 0) {
265 dev_err(&device->dev,
266 "failed to cleanup %s: %d\n",
267 dev_name(client->dev), err);
268 mutex_unlock(&device->clients_lock);
269 return err;
270 }
271 }
272 }
273
274 list_for_each_entry_reverse(client, &device->clients, list) {
275 if (client->ops && client->ops->late_exit) {
276 err = client->ops->late_exit(client);
277 if (err < 0) {
278 dev_err(&device->dev, "failed to late cleanup %s: %d\n",
279 dev_name(client->dev), err);
280 mutex_unlock(&device->clients_lock);
281 return err;
282 }
283 }
284 }
285
286 mutex_unlock(&device->clients_lock);
287
288 return 0;
289}
290EXPORT_SYMBOL(host1x_device_exit);
291
292static int host1x_add_client(struct host1x *host1x,
293 struct host1x_client *client)
294{
295 struct host1x_device *device;
296 struct host1x_subdev *subdev;
297
298 mutex_lock(&host1x->devices_lock);
299
300 list_for_each_entry(device, &host1x->devices, list) {
301 list_for_each_entry(subdev, &device->subdevs, list) {
302 if (subdev->np == client->dev->of_node) {
303 host1x_subdev_register(device, subdev, client);
304 mutex_unlock(&host1x->devices_lock);
305 return 0;
306 }
307 }
308 }
309
310 mutex_unlock(&host1x->devices_lock);
311 return -ENODEV;
312}
313
314static int host1x_del_client(struct host1x *host1x,
315 struct host1x_client *client)
316{
317 struct host1x_device *device, *dt;
318 struct host1x_subdev *subdev;
319
320 mutex_lock(&host1x->devices_lock);
321
322 list_for_each_entry_safe(device, dt, &host1x->devices, list) {
323 list_for_each_entry(subdev, &device->active, list) {
324 if (subdev->client == client) {
325 host1x_subdev_unregister(device, subdev);
326 mutex_unlock(&host1x->devices_lock);
327 return 0;
328 }
329 }
330 }
331
332 mutex_unlock(&host1x->devices_lock);
333 return -ENODEV;
334}
335
336static int host1x_device_match(struct device *dev, struct device_driver *drv)
337{
338 return strcmp(dev_name(dev), drv->name) == 0;
339}
340
341static int host1x_device_uevent(struct device *dev,
342 struct kobj_uevent_env *env)
343{
344 struct device_node *np = dev->parent->of_node;
345 unsigned int count = 0;
346 struct property *p;
347 const char *compat;
348
349 /*
350 * This duplicates most of of_device_uevent(), but the latter cannot
351 * be called from modules and operates on dev->of_node, which is not
352 * available in this case.
353 *
354 * Note that this is really only needed for backwards compatibility
355 * with libdrm, which parses this information from sysfs and will
356 * fail if it can't find the OF_FULLNAME, specifically.
357 */
358 add_uevent_var(env, "OF_NAME=%pOFn", np);
359 add_uevent_var(env, "OF_FULLNAME=%pOF", np);
360
361 of_property_for_each_string(np, "compatible", p, compat) {
362 add_uevent_var(env, "OF_COMPATIBLE_%u=%s", count, compat);
363 count++;
364 }
365
366 add_uevent_var(env, "OF_COMPATIBLE_N=%u", count);
367
368 return 0;
369}
370
371static int host1x_dma_configure(struct device *dev)
372{
373 return of_dma_configure(dev, dev->of_node, true);
374}
375
376static const struct dev_pm_ops host1x_device_pm_ops = {
377 .suspend = pm_generic_suspend,
378 .resume = pm_generic_resume,
379 .freeze = pm_generic_freeze,
380 .thaw = pm_generic_thaw,
381 .poweroff = pm_generic_poweroff,
382 .restore = pm_generic_restore,
383};
384
385struct bus_type host1x_bus_type = {
386 .name = "host1x",
387 .match = host1x_device_match,
388 .uevent = host1x_device_uevent,
389 .dma_configure = host1x_dma_configure,
390 .pm = &host1x_device_pm_ops,
391};
392
393static void __host1x_device_del(struct host1x_device *device)
394{
395 struct host1x_subdev *subdev, *sd;
396 struct host1x_client *client, *cl;
397
398 mutex_lock(&device->subdevs_lock);
399
400 /* unregister subdevices */
401 list_for_each_entry_safe(subdev, sd, &device->active, list) {
402 /*
403 * host1x_subdev_unregister() will remove the client from
404 * any lists, so we'll need to manually add it back to the
405 * list of idle clients.
406 *
407 * XXX: Alternatively, perhaps don't remove the client from
408 * any lists in host1x_subdev_unregister() and instead do
409 * that explicitly from host1x_unregister_client()?
410 */
411 client = subdev->client;
412
413 __host1x_subdev_unregister(device, subdev);
414
415 /* add the client to the list of idle clients */
416 mutex_lock(&clients_lock);
417 list_add_tail(&client->list, &clients);
418 mutex_unlock(&clients_lock);
419 }
420
421 /* remove subdevices */
422 list_for_each_entry_safe(subdev, sd, &device->subdevs, list)
423 host1x_subdev_del(subdev);
424
425 mutex_unlock(&device->subdevs_lock);
426
427 /* move clients to idle list */
428 mutex_lock(&clients_lock);
429 mutex_lock(&device->clients_lock);
430
431 list_for_each_entry_safe(client, cl, &device->clients, list)
432 list_move_tail(&client->list, &clients);
433
434 mutex_unlock(&device->clients_lock);
435 mutex_unlock(&clients_lock);
436
437 /* finally remove the device */
438 list_del_init(&device->list);
439}
440
441static void host1x_device_release(struct device *dev)
442{
443 struct host1x_device *device = to_host1x_device(dev);
444
445 __host1x_device_del(device);
446 kfree(device);
447}
448
449static int host1x_device_add(struct host1x *host1x,
450 struct host1x_driver *driver)
451{
452 struct host1x_client *client, *tmp;
453 struct host1x_subdev *subdev;
454 struct host1x_device *device;
455 int err;
456
457 device = kzalloc(sizeof(*device), GFP_KERNEL);
458 if (!device)
459 return -ENOMEM;
460
461 device_initialize(&device->dev);
462
463 mutex_init(&device->subdevs_lock);
464 INIT_LIST_HEAD(&device->subdevs);
465 INIT_LIST_HEAD(&device->active);
466 mutex_init(&device->clients_lock);
467 INIT_LIST_HEAD(&device->clients);
468 INIT_LIST_HEAD(&device->list);
469 device->driver = driver;
470
471 device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask;
472 device->dev.dma_mask = &device->dev.coherent_dma_mask;
473 dev_set_name(&device->dev, "%s", driver->driver.name);
474 device->dev.release = host1x_device_release;
475 device->dev.bus = &host1x_bus_type;
476 device->dev.parent = host1x->dev;
477
478 of_dma_configure(&device->dev, host1x->dev->of_node, true);
479
480 device->dev.dma_parms = &device->dma_parms;
481 dma_set_max_seg_size(&device->dev, UINT_MAX);
482
483 err = host1x_device_parse_dt(device, driver);
484 if (err < 0) {
485 kfree(device);
486 return err;
487 }
488
489 list_add_tail(&device->list, &host1x->devices);
490
491 mutex_lock(&clients_lock);
492
493 list_for_each_entry_safe(client, tmp, &clients, list) {
494 list_for_each_entry(subdev, &device->subdevs, list) {
495 if (subdev->np == client->dev->of_node) {
496 host1x_subdev_register(device, subdev, client);
497 break;
498 }
499 }
500 }
501
502 mutex_unlock(&clients_lock);
503
504 return 0;
505}
506
507/*
508 * Removes a device by first unregistering any subdevices and then removing
509 * itself from the list of devices.
510 *
511 * This function must be called with the host1x->devices_lock held.
512 */
513static void host1x_device_del(struct host1x *host1x,
514 struct host1x_device *device)
515{
516 if (device->registered) {
517 device->registered = false;
518 device_del(&device->dev);
519 }
520
521 put_device(&device->dev);
522}
523
524static void host1x_attach_driver(struct host1x *host1x,
525 struct host1x_driver *driver)
526{
527 struct host1x_device *device;
528 int err;
529
530 mutex_lock(&host1x->devices_lock);
531
532 list_for_each_entry(device, &host1x->devices, list) {
533 if (device->driver == driver) {
534 mutex_unlock(&host1x->devices_lock);
535 return;
536 }
537 }
538
539 err = host1x_device_add(host1x, driver);
540 if (err < 0)
541 dev_err(host1x->dev, "failed to allocate device: %d\n", err);
542
543 mutex_unlock(&host1x->devices_lock);
544}
545
546static void host1x_detach_driver(struct host1x *host1x,
547 struct host1x_driver *driver)
548{
549 struct host1x_device *device, *tmp;
550
551 mutex_lock(&host1x->devices_lock);
552
553 list_for_each_entry_safe(device, tmp, &host1x->devices, list)
554 if (device->driver == driver)
555 host1x_device_del(host1x, device);
556
557 mutex_unlock(&host1x->devices_lock);
558}
559
560static int host1x_devices_show(struct seq_file *s, void *data)
561{
562 struct host1x *host1x = s->private;
563 struct host1x_device *device;
564
565 mutex_lock(&host1x->devices_lock);
566
567 list_for_each_entry(device, &host1x->devices, list) {
568 struct host1x_subdev *subdev;
569
570 seq_printf(s, "%s\n", dev_name(&device->dev));
571
572 mutex_lock(&device->subdevs_lock);
573
574 list_for_each_entry(subdev, &device->active, list)
575 seq_printf(s, " %pOFf: %s\n", subdev->np,
576 dev_name(subdev->client->dev));
577
578 list_for_each_entry(subdev, &device->subdevs, list)
579 seq_printf(s, " %pOFf:\n", subdev->np);
580
581 mutex_unlock(&device->subdevs_lock);
582 }
583
584 mutex_unlock(&host1x->devices_lock);
585
586 return 0;
587}
588DEFINE_SHOW_ATTRIBUTE(host1x_devices);
589
590/**
591 * host1x_register() - register a host1x controller
592 * @host1x: host1x controller
593 *
594 * The host1x controller driver uses this to register a host1x controller with
595 * the infrastructure. Note that all Tegra SoC generations have only ever come
596 * with a single host1x instance, so this function is somewhat academic.
597 */
598int host1x_register(struct host1x *host1x)
599{
600 struct host1x_driver *driver;
601
602 mutex_lock(&devices_lock);
603 list_add_tail(&host1x->list, &devices);
604 mutex_unlock(&devices_lock);
605
606 mutex_lock(&drivers_lock);
607
608 list_for_each_entry(driver, &drivers, list)
609 host1x_attach_driver(host1x, driver);
610
611 mutex_unlock(&drivers_lock);
612
613 debugfs_create_file("devices", S_IRUGO, host1x->debugfs, host1x,
614 &host1x_devices_fops);
615
616 return 0;
617}
618
619/**
620 * host1x_unregister() - unregister a host1x controller
621 * @host1x: host1x controller
622 *
623 * The host1x controller driver uses this to remove a host1x controller from
624 * the infrastructure.
625 */
626int host1x_unregister(struct host1x *host1x)
627{
628 struct host1x_driver *driver;
629
630 mutex_lock(&drivers_lock);
631
632 list_for_each_entry(driver, &drivers, list)
633 host1x_detach_driver(host1x, driver);
634
635 mutex_unlock(&drivers_lock);
636
637 mutex_lock(&devices_lock);
638 list_del_init(&host1x->list);
639 mutex_unlock(&devices_lock);
640
641 return 0;
642}
643
644static int host1x_device_probe(struct device *dev)
645{
646 struct host1x_driver *driver = to_host1x_driver(dev->driver);
647 struct host1x_device *device = to_host1x_device(dev);
648
649 if (driver->probe)
650 return driver->probe(device);
651
652 return 0;
653}
654
655static int host1x_device_remove(struct device *dev)
656{
657 struct host1x_driver *driver = to_host1x_driver(dev->driver);
658 struct host1x_device *device = to_host1x_device(dev);
659
660 if (driver->remove)
661 return driver->remove(device);
662
663 return 0;
664}
665
666static void host1x_device_shutdown(struct device *dev)
667{
668 struct host1x_driver *driver = to_host1x_driver(dev->driver);
669 struct host1x_device *device = to_host1x_device(dev);
670
671 if (driver->shutdown)
672 driver->shutdown(device);
673}
674
675/**
676 * host1x_driver_register_full() - register a host1x driver
677 * @driver: host1x driver
678 * @owner: owner module
679 *
680 * Drivers for host1x logical devices call this function to register a driver
681 * with the infrastructure. Note that since these drive logical devices, the
682 * registration of the driver actually triggers tho logical device creation.
683 * A logical device will be created for each host1x instance.
684 */
685int host1x_driver_register_full(struct host1x_driver *driver,
686 struct module *owner)
687{
688 struct host1x *host1x;
689
690 INIT_LIST_HEAD(&driver->list);
691
692 mutex_lock(&drivers_lock);
693 list_add_tail(&driver->list, &drivers);
694 mutex_unlock(&drivers_lock);
695
696 mutex_lock(&devices_lock);
697
698 list_for_each_entry(host1x, &devices, list)
699 host1x_attach_driver(host1x, driver);
700
701 mutex_unlock(&devices_lock);
702
703 driver->driver.bus = &host1x_bus_type;
704 driver->driver.owner = owner;
705 driver->driver.probe = host1x_device_probe;
706 driver->driver.remove = host1x_device_remove;
707 driver->driver.shutdown = host1x_device_shutdown;
708
709 return driver_register(&driver->driver);
710}
711EXPORT_SYMBOL(host1x_driver_register_full);
712
713/**
714 * host1x_driver_unregister() - unregister a host1x driver
715 * @driver: host1x driver
716 *
717 * Unbinds the driver from each of the host1x logical devices that it is
718 * bound to, effectively removing the subsystem devices that they represent.
719 */
720void host1x_driver_unregister(struct host1x_driver *driver)
721{
722 struct host1x *host1x;
723
724 driver_unregister(&driver->driver);
725
726 mutex_lock(&devices_lock);
727
728 list_for_each_entry(host1x, &devices, list)
729 host1x_detach_driver(host1x, driver);
730
731 mutex_unlock(&devices_lock);
732
733 mutex_lock(&drivers_lock);
734 list_del_init(&driver->list);
735 mutex_unlock(&drivers_lock);
736}
737EXPORT_SYMBOL(host1x_driver_unregister);
738
739/**
740 * __host1x_client_init() - initialize a host1x client
741 * @client: host1x client
742 * @key: lock class key for the client-specific mutex
743 */
744void __host1x_client_init(struct host1x_client *client, struct lock_class_key *key)
745{
746 host1x_bo_cache_init(&client->cache);
747 INIT_LIST_HEAD(&client->list);
748 __mutex_init(&client->lock, "host1x client lock", key);
749 client->usecount = 0;
750}
751EXPORT_SYMBOL(__host1x_client_init);
752
753/**
754 * host1x_client_exit() - uninitialize a host1x client
755 * @client: host1x client
756 */
757void host1x_client_exit(struct host1x_client *client)
758{
759 mutex_destroy(&client->lock);
760}
761EXPORT_SYMBOL(host1x_client_exit);
762
763/**
764 * __host1x_client_register() - register a host1x client
765 * @client: host1x client
766 *
767 * Registers a host1x client with each host1x controller instance. Note that
768 * each client will only match their parent host1x controller and will only be
769 * associated with that instance. Once all clients have been registered with
770 * their parent host1x controller, the infrastructure will set up the logical
771 * device and call host1x_device_init(), which will in turn call each client's
772 * &host1x_client_ops.init implementation.
773 */
774int __host1x_client_register(struct host1x_client *client)
775{
776 struct host1x *host1x;
777 int err;
778
779 mutex_lock(&devices_lock);
780
781 list_for_each_entry(host1x, &devices, list) {
782 err = host1x_add_client(host1x, client);
783 if (!err) {
784 mutex_unlock(&devices_lock);
785 return 0;
786 }
787 }
788
789 mutex_unlock(&devices_lock);
790
791 mutex_lock(&clients_lock);
792 list_add_tail(&client->list, &clients);
793 mutex_unlock(&clients_lock);
794
795 return 0;
796}
797EXPORT_SYMBOL(__host1x_client_register);
798
799/**
800 * host1x_client_unregister() - unregister a host1x client
801 * @client: host1x client
802 *
803 * Removes a host1x client from its host1x controller instance. If a logical
804 * device has already been initialized, it will be torn down.
805 */
806int host1x_client_unregister(struct host1x_client *client)
807{
808 struct host1x_client *c;
809 struct host1x *host1x;
810 int err;
811
812 mutex_lock(&devices_lock);
813
814 list_for_each_entry(host1x, &devices, list) {
815 err = host1x_del_client(host1x, client);
816 if (!err) {
817 mutex_unlock(&devices_lock);
818 return 0;
819 }
820 }
821
822 mutex_unlock(&devices_lock);
823 mutex_lock(&clients_lock);
824
825 list_for_each_entry(c, &clients, list) {
826 if (c == client) {
827 list_del_init(&c->list);
828 break;
829 }
830 }
831
832 mutex_unlock(&clients_lock);
833
834 host1x_bo_cache_destroy(&client->cache);
835
836 return 0;
837}
838EXPORT_SYMBOL(host1x_client_unregister);
839
840int host1x_client_suspend(struct host1x_client *client)
841{
842 int err = 0;
843
844 mutex_lock(&client->lock);
845
846 if (client->usecount == 1) {
847 if (client->ops && client->ops->suspend) {
848 err = client->ops->suspend(client);
849 if (err < 0)
850 goto unlock;
851 }
852 }
853
854 client->usecount--;
855 dev_dbg(client->dev, "use count: %u\n", client->usecount);
856
857 if (client->parent) {
858 err = host1x_client_suspend(client->parent);
859 if (err < 0)
860 goto resume;
861 }
862
863 goto unlock;
864
865resume:
866 if (client->usecount == 0)
867 if (client->ops && client->ops->resume)
868 client->ops->resume(client);
869
870 client->usecount++;
871unlock:
872 mutex_unlock(&client->lock);
873 return err;
874}
875EXPORT_SYMBOL(host1x_client_suspend);
876
877int host1x_client_resume(struct host1x_client *client)
878{
879 int err = 0;
880
881 mutex_lock(&client->lock);
882
883 if (client->parent) {
884 err = host1x_client_resume(client->parent);
885 if (err < 0)
886 goto unlock;
887 }
888
889 if (client->usecount == 0) {
890 if (client->ops && client->ops->resume) {
891 err = client->ops->resume(client);
892 if (err < 0)
893 goto suspend;
894 }
895 }
896
897 client->usecount++;
898 dev_dbg(client->dev, "use count: %u\n", client->usecount);
899
900 goto unlock;
901
902suspend:
903 if (client->parent)
904 host1x_client_suspend(client->parent);
905unlock:
906 mutex_unlock(&client->lock);
907 return err;
908}
909EXPORT_SYMBOL(host1x_client_resume);
910
911struct host1x_bo_mapping *host1x_bo_pin(struct device *dev, struct host1x_bo *bo,
912 enum dma_data_direction dir,
913 struct host1x_bo_cache *cache)
914{
915 struct host1x_bo_mapping *mapping;
916
917 if (cache) {
918 mutex_lock(&cache->lock);
919
920 list_for_each_entry(mapping, &cache->mappings, entry) {
921 if (mapping->bo == bo && mapping->direction == dir) {
922 kref_get(&mapping->ref);
923 goto unlock;
924 }
925 }
926 }
927
928 mapping = bo->ops->pin(dev, bo, dir);
929 if (IS_ERR(mapping))
930 goto unlock;
931
932 spin_lock(&mapping->bo->lock);
933 list_add_tail(&mapping->list, &bo->mappings);
934 spin_unlock(&mapping->bo->lock);
935
936 if (cache) {
937 INIT_LIST_HEAD(&mapping->entry);
938 mapping->cache = cache;
939
940 list_add_tail(&mapping->entry, &cache->mappings);
941
942 /* bump reference count to track the copy in the cache */
943 kref_get(&mapping->ref);
944 }
945
946unlock:
947 if (cache)
948 mutex_unlock(&cache->lock);
949
950 return mapping;
951}
952EXPORT_SYMBOL(host1x_bo_pin);
953
954static void __host1x_bo_unpin(struct kref *ref)
955{
956 struct host1x_bo_mapping *mapping = to_host1x_bo_mapping(ref);
957
958 /*
959 * When the last reference of the mapping goes away, make sure to remove the mapping from
960 * the cache.
961 */
962 if (mapping->cache)
963 list_del(&mapping->entry);
964
965 spin_lock(&mapping->bo->lock);
966 list_del(&mapping->list);
967 spin_unlock(&mapping->bo->lock);
968
969 mapping->bo->ops->unpin(mapping);
970}
971
972void host1x_bo_unpin(struct host1x_bo_mapping *mapping)
973{
974 struct host1x_bo_cache *cache = mapping->cache;
975
976 if (cache)
977 mutex_lock(&cache->lock);
978
979 kref_put(&mapping->ref, __host1x_bo_unpin);
980
981 if (cache)
982 mutex_unlock(&cache->lock);
983}
984EXPORT_SYMBOL(host1x_bo_unpin);