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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
341/*
342 * Note that this is really only needed for backwards compatibility
343 * with libdrm, which parses this information from sysfs and will
344 * fail if it can't find the OF_FULLNAME, specifically.
345 */
346static int host1x_device_uevent(const struct device *dev,
347 struct kobj_uevent_env *env)
348{
349 of_device_uevent(dev->parent, env);
350
351 return 0;
352}
353
354static int host1x_dma_configure(struct device *dev)
355{
356 return of_dma_configure(dev, dev->of_node, true);
357}
358
359static const struct dev_pm_ops host1x_device_pm_ops = {
360 .suspend = pm_generic_suspend,
361 .resume = pm_generic_resume,
362 .freeze = pm_generic_freeze,
363 .thaw = pm_generic_thaw,
364 .poweroff = pm_generic_poweroff,
365 .restore = pm_generic_restore,
366};
367
368struct bus_type host1x_bus_type = {
369 .name = "host1x",
370 .match = host1x_device_match,
371 .uevent = host1x_device_uevent,
372 .dma_configure = host1x_dma_configure,
373 .pm = &host1x_device_pm_ops,
374};
375
376static void __host1x_device_del(struct host1x_device *device)
377{
378 struct host1x_subdev *subdev, *sd;
379 struct host1x_client *client, *cl;
380
381 mutex_lock(&device->subdevs_lock);
382
383 /* unregister subdevices */
384 list_for_each_entry_safe(subdev, sd, &device->active, list) {
385 /*
386 * host1x_subdev_unregister() will remove the client from
387 * any lists, so we'll need to manually add it back to the
388 * list of idle clients.
389 *
390 * XXX: Alternatively, perhaps don't remove the client from
391 * any lists in host1x_subdev_unregister() and instead do
392 * that explicitly from host1x_unregister_client()?
393 */
394 client = subdev->client;
395
396 __host1x_subdev_unregister(device, subdev);
397
398 /* add the client to the list of idle clients */
399 mutex_lock(&clients_lock);
400 list_add_tail(&client->list, &clients);
401 mutex_unlock(&clients_lock);
402 }
403
404 /* remove subdevices */
405 list_for_each_entry_safe(subdev, sd, &device->subdevs, list)
406 host1x_subdev_del(subdev);
407
408 mutex_unlock(&device->subdevs_lock);
409
410 /* move clients to idle list */
411 mutex_lock(&clients_lock);
412 mutex_lock(&device->clients_lock);
413
414 list_for_each_entry_safe(client, cl, &device->clients, list)
415 list_move_tail(&client->list, &clients);
416
417 mutex_unlock(&device->clients_lock);
418 mutex_unlock(&clients_lock);
419
420 /* finally remove the device */
421 list_del_init(&device->list);
422}
423
424static void host1x_device_release(struct device *dev)
425{
426 struct host1x_device *device = to_host1x_device(dev);
427
428 __host1x_device_del(device);
429 kfree(device);
430}
431
432static int host1x_device_add(struct host1x *host1x,
433 struct host1x_driver *driver)
434{
435 struct host1x_client *client, *tmp;
436 struct host1x_subdev *subdev;
437 struct host1x_device *device;
438 int err;
439
440 device = kzalloc(sizeof(*device), GFP_KERNEL);
441 if (!device)
442 return -ENOMEM;
443
444 device_initialize(&device->dev);
445
446 mutex_init(&device->subdevs_lock);
447 INIT_LIST_HEAD(&device->subdevs);
448 INIT_LIST_HEAD(&device->active);
449 mutex_init(&device->clients_lock);
450 INIT_LIST_HEAD(&device->clients);
451 INIT_LIST_HEAD(&device->list);
452 device->driver = driver;
453
454 device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask;
455 device->dev.dma_mask = &device->dev.coherent_dma_mask;
456 dev_set_name(&device->dev, "%s", driver->driver.name);
457 device->dev.release = host1x_device_release;
458 device->dev.bus = &host1x_bus_type;
459 device->dev.parent = host1x->dev;
460
461 of_dma_configure(&device->dev, host1x->dev->of_node, true);
462
463 device->dev.dma_parms = &device->dma_parms;
464 dma_set_max_seg_size(&device->dev, UINT_MAX);
465
466 err = host1x_device_parse_dt(device, driver);
467 if (err < 0) {
468 kfree(device);
469 return err;
470 }
471
472 list_add_tail(&device->list, &host1x->devices);
473
474 mutex_lock(&clients_lock);
475
476 list_for_each_entry_safe(client, tmp, &clients, list) {
477 list_for_each_entry(subdev, &device->subdevs, list) {
478 if (subdev->np == client->dev->of_node) {
479 host1x_subdev_register(device, subdev, client);
480 break;
481 }
482 }
483 }
484
485 mutex_unlock(&clients_lock);
486
487 return 0;
488}
489
490/*
491 * Removes a device by first unregistering any subdevices and then removing
492 * itself from the list of devices.
493 *
494 * This function must be called with the host1x->devices_lock held.
495 */
496static void host1x_device_del(struct host1x *host1x,
497 struct host1x_device *device)
498{
499 if (device->registered) {
500 device->registered = false;
501 device_del(&device->dev);
502 }
503
504 put_device(&device->dev);
505}
506
507static void host1x_attach_driver(struct host1x *host1x,
508 struct host1x_driver *driver)
509{
510 struct host1x_device *device;
511 int err;
512
513 mutex_lock(&host1x->devices_lock);
514
515 list_for_each_entry(device, &host1x->devices, list) {
516 if (device->driver == driver) {
517 mutex_unlock(&host1x->devices_lock);
518 return;
519 }
520 }
521
522 err = host1x_device_add(host1x, driver);
523 if (err < 0)
524 dev_err(host1x->dev, "failed to allocate device: %d\n", err);
525
526 mutex_unlock(&host1x->devices_lock);
527}
528
529static void host1x_detach_driver(struct host1x *host1x,
530 struct host1x_driver *driver)
531{
532 struct host1x_device *device, *tmp;
533
534 mutex_lock(&host1x->devices_lock);
535
536 list_for_each_entry_safe(device, tmp, &host1x->devices, list)
537 if (device->driver == driver)
538 host1x_device_del(host1x, device);
539
540 mutex_unlock(&host1x->devices_lock);
541}
542
543static int host1x_devices_show(struct seq_file *s, void *data)
544{
545 struct host1x *host1x = s->private;
546 struct host1x_device *device;
547
548 mutex_lock(&host1x->devices_lock);
549
550 list_for_each_entry(device, &host1x->devices, list) {
551 struct host1x_subdev *subdev;
552
553 seq_printf(s, "%s\n", dev_name(&device->dev));
554
555 mutex_lock(&device->subdevs_lock);
556
557 list_for_each_entry(subdev, &device->active, list)
558 seq_printf(s, " %pOFf: %s\n", subdev->np,
559 dev_name(subdev->client->dev));
560
561 list_for_each_entry(subdev, &device->subdevs, list)
562 seq_printf(s, " %pOFf:\n", subdev->np);
563
564 mutex_unlock(&device->subdevs_lock);
565 }
566
567 mutex_unlock(&host1x->devices_lock);
568
569 return 0;
570}
571DEFINE_SHOW_ATTRIBUTE(host1x_devices);
572
573/**
574 * host1x_register() - register a host1x controller
575 * @host1x: host1x controller
576 *
577 * The host1x controller driver uses this to register a host1x controller with
578 * the infrastructure. Note that all Tegra SoC generations have only ever come
579 * with a single host1x instance, so this function is somewhat academic.
580 */
581int host1x_register(struct host1x *host1x)
582{
583 struct host1x_driver *driver;
584
585 mutex_lock(&devices_lock);
586 list_add_tail(&host1x->list, &devices);
587 mutex_unlock(&devices_lock);
588
589 mutex_lock(&drivers_lock);
590
591 list_for_each_entry(driver, &drivers, list)
592 host1x_attach_driver(host1x, driver);
593
594 mutex_unlock(&drivers_lock);
595
596 debugfs_create_file("devices", S_IRUGO, host1x->debugfs, host1x,
597 &host1x_devices_fops);
598
599 return 0;
600}
601
602/**
603 * host1x_unregister() - unregister a host1x controller
604 * @host1x: host1x controller
605 *
606 * The host1x controller driver uses this to remove a host1x controller from
607 * the infrastructure.
608 */
609int host1x_unregister(struct host1x *host1x)
610{
611 struct host1x_driver *driver;
612
613 mutex_lock(&drivers_lock);
614
615 list_for_each_entry(driver, &drivers, list)
616 host1x_detach_driver(host1x, driver);
617
618 mutex_unlock(&drivers_lock);
619
620 mutex_lock(&devices_lock);
621 list_del_init(&host1x->list);
622 mutex_unlock(&devices_lock);
623
624 return 0;
625}
626
627static int host1x_device_probe(struct device *dev)
628{
629 struct host1x_driver *driver = to_host1x_driver(dev->driver);
630 struct host1x_device *device = to_host1x_device(dev);
631
632 if (driver->probe)
633 return driver->probe(device);
634
635 return 0;
636}
637
638static int host1x_device_remove(struct device *dev)
639{
640 struct host1x_driver *driver = to_host1x_driver(dev->driver);
641 struct host1x_device *device = to_host1x_device(dev);
642
643 if (driver->remove)
644 return driver->remove(device);
645
646 return 0;
647}
648
649static void host1x_device_shutdown(struct device *dev)
650{
651 struct host1x_driver *driver = to_host1x_driver(dev->driver);
652 struct host1x_device *device = to_host1x_device(dev);
653
654 if (driver->shutdown)
655 driver->shutdown(device);
656}
657
658/**
659 * host1x_driver_register_full() - register a host1x driver
660 * @driver: host1x driver
661 * @owner: owner module
662 *
663 * Drivers for host1x logical devices call this function to register a driver
664 * with the infrastructure. Note that since these drive logical devices, the
665 * registration of the driver actually triggers tho logical device creation.
666 * A logical device will be created for each host1x instance.
667 */
668int host1x_driver_register_full(struct host1x_driver *driver,
669 struct module *owner)
670{
671 struct host1x *host1x;
672
673 INIT_LIST_HEAD(&driver->list);
674
675 mutex_lock(&drivers_lock);
676 list_add_tail(&driver->list, &drivers);
677 mutex_unlock(&drivers_lock);
678
679 mutex_lock(&devices_lock);
680
681 list_for_each_entry(host1x, &devices, list)
682 host1x_attach_driver(host1x, driver);
683
684 mutex_unlock(&devices_lock);
685
686 driver->driver.bus = &host1x_bus_type;
687 driver->driver.owner = owner;
688 driver->driver.probe = host1x_device_probe;
689 driver->driver.remove = host1x_device_remove;
690 driver->driver.shutdown = host1x_device_shutdown;
691
692 return driver_register(&driver->driver);
693}
694EXPORT_SYMBOL(host1x_driver_register_full);
695
696/**
697 * host1x_driver_unregister() - unregister a host1x driver
698 * @driver: host1x driver
699 *
700 * Unbinds the driver from each of the host1x logical devices that it is
701 * bound to, effectively removing the subsystem devices that they represent.
702 */
703void host1x_driver_unregister(struct host1x_driver *driver)
704{
705 struct host1x *host1x;
706
707 driver_unregister(&driver->driver);
708
709 mutex_lock(&devices_lock);
710
711 list_for_each_entry(host1x, &devices, list)
712 host1x_detach_driver(host1x, driver);
713
714 mutex_unlock(&devices_lock);
715
716 mutex_lock(&drivers_lock);
717 list_del_init(&driver->list);
718 mutex_unlock(&drivers_lock);
719}
720EXPORT_SYMBOL(host1x_driver_unregister);
721
722/**
723 * __host1x_client_init() - initialize a host1x client
724 * @client: host1x client
725 * @key: lock class key for the client-specific mutex
726 */
727void __host1x_client_init(struct host1x_client *client, struct lock_class_key *key)
728{
729 host1x_bo_cache_init(&client->cache);
730 INIT_LIST_HEAD(&client->list);
731 __mutex_init(&client->lock, "host1x client lock", key);
732 client->usecount = 0;
733}
734EXPORT_SYMBOL(__host1x_client_init);
735
736/**
737 * host1x_client_exit() - uninitialize a host1x client
738 * @client: host1x client
739 */
740void host1x_client_exit(struct host1x_client *client)
741{
742 mutex_destroy(&client->lock);
743}
744EXPORT_SYMBOL(host1x_client_exit);
745
746/**
747 * __host1x_client_register() - register a host1x client
748 * @client: host1x client
749 *
750 * Registers a host1x client with each host1x controller instance. Note that
751 * each client will only match their parent host1x controller and will only be
752 * associated with that instance. Once all clients have been registered with
753 * their parent host1x controller, the infrastructure will set up the logical
754 * device and call host1x_device_init(), which will in turn call each client's
755 * &host1x_client_ops.init implementation.
756 */
757int __host1x_client_register(struct host1x_client *client)
758{
759 struct host1x *host1x;
760 int err;
761
762 mutex_lock(&devices_lock);
763
764 list_for_each_entry(host1x, &devices, list) {
765 err = host1x_add_client(host1x, client);
766 if (!err) {
767 mutex_unlock(&devices_lock);
768 return 0;
769 }
770 }
771
772 mutex_unlock(&devices_lock);
773
774 mutex_lock(&clients_lock);
775 list_add_tail(&client->list, &clients);
776 mutex_unlock(&clients_lock);
777
778 return 0;
779}
780EXPORT_SYMBOL(__host1x_client_register);
781
782/**
783 * host1x_client_unregister() - unregister a host1x client
784 * @client: host1x client
785 *
786 * Removes a host1x client from its host1x controller instance. If a logical
787 * device has already been initialized, it will be torn down.
788 */
789void host1x_client_unregister(struct host1x_client *client)
790{
791 struct host1x_client *c;
792 struct host1x *host1x;
793 int err;
794
795 mutex_lock(&devices_lock);
796
797 list_for_each_entry(host1x, &devices, list) {
798 err = host1x_del_client(host1x, client);
799 if (!err) {
800 mutex_unlock(&devices_lock);
801 return;
802 }
803 }
804
805 mutex_unlock(&devices_lock);
806 mutex_lock(&clients_lock);
807
808 list_for_each_entry(c, &clients, list) {
809 if (c == client) {
810 list_del_init(&c->list);
811 break;
812 }
813 }
814
815 mutex_unlock(&clients_lock);
816
817 host1x_bo_cache_destroy(&client->cache);
818}
819EXPORT_SYMBOL(host1x_client_unregister);
820
821int host1x_client_suspend(struct host1x_client *client)
822{
823 int err = 0;
824
825 mutex_lock(&client->lock);
826
827 if (client->usecount == 1) {
828 if (client->ops && client->ops->suspend) {
829 err = client->ops->suspend(client);
830 if (err < 0)
831 goto unlock;
832 }
833 }
834
835 client->usecount--;
836 dev_dbg(client->dev, "use count: %u\n", client->usecount);
837
838 if (client->parent) {
839 err = host1x_client_suspend(client->parent);
840 if (err < 0)
841 goto resume;
842 }
843
844 goto unlock;
845
846resume:
847 if (client->usecount == 0)
848 if (client->ops && client->ops->resume)
849 client->ops->resume(client);
850
851 client->usecount++;
852unlock:
853 mutex_unlock(&client->lock);
854 return err;
855}
856EXPORT_SYMBOL(host1x_client_suspend);
857
858int host1x_client_resume(struct host1x_client *client)
859{
860 int err = 0;
861
862 mutex_lock(&client->lock);
863
864 if (client->parent) {
865 err = host1x_client_resume(client->parent);
866 if (err < 0)
867 goto unlock;
868 }
869
870 if (client->usecount == 0) {
871 if (client->ops && client->ops->resume) {
872 err = client->ops->resume(client);
873 if (err < 0)
874 goto suspend;
875 }
876 }
877
878 client->usecount++;
879 dev_dbg(client->dev, "use count: %u\n", client->usecount);
880
881 goto unlock;
882
883suspend:
884 if (client->parent)
885 host1x_client_suspend(client->parent);
886unlock:
887 mutex_unlock(&client->lock);
888 return err;
889}
890EXPORT_SYMBOL(host1x_client_resume);
891
892struct host1x_bo_mapping *host1x_bo_pin(struct device *dev, struct host1x_bo *bo,
893 enum dma_data_direction dir,
894 struct host1x_bo_cache *cache)
895{
896 struct host1x_bo_mapping *mapping;
897
898 if (cache) {
899 mutex_lock(&cache->lock);
900
901 list_for_each_entry(mapping, &cache->mappings, entry) {
902 if (mapping->bo == bo && mapping->direction == dir) {
903 kref_get(&mapping->ref);
904 goto unlock;
905 }
906 }
907 }
908
909 mapping = bo->ops->pin(dev, bo, dir);
910 if (IS_ERR(mapping))
911 goto unlock;
912
913 spin_lock(&mapping->bo->lock);
914 list_add_tail(&mapping->list, &bo->mappings);
915 spin_unlock(&mapping->bo->lock);
916
917 if (cache) {
918 INIT_LIST_HEAD(&mapping->entry);
919 mapping->cache = cache;
920
921 list_add_tail(&mapping->entry, &cache->mappings);
922
923 /* bump reference count to track the copy in the cache */
924 kref_get(&mapping->ref);
925 }
926
927unlock:
928 if (cache)
929 mutex_unlock(&cache->lock);
930
931 return mapping;
932}
933EXPORT_SYMBOL(host1x_bo_pin);
934
935static void __host1x_bo_unpin(struct kref *ref)
936{
937 struct host1x_bo_mapping *mapping = to_host1x_bo_mapping(ref);
938
939 /*
940 * When the last reference of the mapping goes away, make sure to remove the mapping from
941 * the cache.
942 */
943 if (mapping->cache)
944 list_del(&mapping->entry);
945
946 spin_lock(&mapping->bo->lock);
947 list_del(&mapping->list);
948 spin_unlock(&mapping->bo->lock);
949
950 mapping->bo->ops->unpin(mapping);
951}
952
953void host1x_bo_unpin(struct host1x_bo_mapping *mapping)
954{
955 struct host1x_bo_cache *cache = mapping->cache;
956
957 if (cache)
958 mutex_lock(&cache->lock);
959
960 kref_put(&mapping->ref, __host1x_bo_unpin);
961
962 if (cache)
963 mutex_unlock(&cache->lock);
964}
965EXPORT_SYMBOL(host1x_bo_unpin);