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1// SPDX-License-Identifier: GPL-2.0 or MIT
2/*
3 * Copyright 2018 Noralf Trønnes
4 */
5
6#include <linux/list.h>
7#include <linux/module.h>
8#include <linux/mutex.h>
9#include <linux/seq_file.h>
10#include <linux/slab.h>
11
12#include <drm/drm_client.h>
13#include <drm/drm_debugfs.h>
14#include <drm/drm_device.h>
15#include <drm/drm_drv.h>
16#include <drm/drm_file.h>
17#include <drm/drm_fourcc.h>
18#include <drm/drm_framebuffer.h>
19#include <drm/drm_gem.h>
20#include <drm/drm_mode.h>
21#include <drm/drm_print.h>
22
23#include "drm_crtc_internal.h"
24#include "drm_internal.h"
25
26/**
27 * DOC: overview
28 *
29 * This library provides support for clients running in the kernel like fbdev and bootsplash.
30 *
31 * GEM drivers which provide a GEM based dumb buffer with a virtual address are supported.
32 */
33
34static int drm_client_open(struct drm_client_dev *client)
35{
36 struct drm_device *dev = client->dev;
37 struct drm_file *file;
38
39 file = drm_file_alloc(dev->primary);
40 if (IS_ERR(file))
41 return PTR_ERR(file);
42
43 mutex_lock(&dev->filelist_mutex);
44 list_add(&file->lhead, &dev->filelist_internal);
45 mutex_unlock(&dev->filelist_mutex);
46
47 client->file = file;
48
49 return 0;
50}
51
52static void drm_client_close(struct drm_client_dev *client)
53{
54 struct drm_device *dev = client->dev;
55
56 mutex_lock(&dev->filelist_mutex);
57 list_del(&client->file->lhead);
58 mutex_unlock(&dev->filelist_mutex);
59
60 drm_file_free(client->file);
61}
62
63/**
64 * drm_client_init - Initialise a DRM client
65 * @dev: DRM device
66 * @client: DRM client
67 * @name: Client name
68 * @funcs: DRM client functions (optional)
69 *
70 * This initialises the client and opens a &drm_file.
71 * Use drm_client_register() to complete the process.
72 * The caller needs to hold a reference on @dev before calling this function.
73 * The client is freed when the &drm_device is unregistered. See drm_client_release().
74 *
75 * Returns:
76 * Zero on success or negative error code on failure.
77 */
78int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
79 const char *name, const struct drm_client_funcs *funcs)
80{
81 int ret;
82
83 if (!drm_core_check_feature(dev, DRIVER_MODESET) || !dev->driver->dumb_create)
84 return -EOPNOTSUPP;
85
86 if (funcs && !try_module_get(funcs->owner))
87 return -ENODEV;
88
89 client->dev = dev;
90 client->name = name;
91 client->funcs = funcs;
92
93 ret = drm_client_modeset_create(client);
94 if (ret)
95 goto err_put_module;
96
97 ret = drm_client_open(client);
98 if (ret)
99 goto err_free;
100
101 drm_dev_get(dev);
102
103 return 0;
104
105err_free:
106 drm_client_modeset_free(client);
107err_put_module:
108 if (funcs)
109 module_put(funcs->owner);
110
111 return ret;
112}
113EXPORT_SYMBOL(drm_client_init);
114
115/**
116 * drm_client_register - Register client
117 * @client: DRM client
118 *
119 * Add the client to the &drm_device client list to activate its callbacks.
120 * @client must be initialized by a call to drm_client_init(). After
121 * drm_client_register() it is no longer permissible to call drm_client_release()
122 * directly (outside the unregister callback), instead cleanup will happen
123 * automatically on driver unload.
124 */
125void drm_client_register(struct drm_client_dev *client)
126{
127 struct drm_device *dev = client->dev;
128
129 mutex_lock(&dev->clientlist_mutex);
130 list_add(&client->list, &dev->clientlist);
131 mutex_unlock(&dev->clientlist_mutex);
132}
133EXPORT_SYMBOL(drm_client_register);
134
135/**
136 * drm_client_release - Release DRM client resources
137 * @client: DRM client
138 *
139 * Releases resources by closing the &drm_file that was opened by drm_client_init().
140 * It is called automatically if the &drm_client_funcs.unregister callback is _not_ set.
141 *
142 * This function should only be called from the unregister callback. An exception
143 * is fbdev which cannot free the buffer if userspace has open file descriptors.
144 *
145 * Note:
146 * Clients cannot initiate a release by themselves. This is done to keep the code simple.
147 * The driver has to be unloaded before the client can be unloaded.
148 */
149void drm_client_release(struct drm_client_dev *client)
150{
151 struct drm_device *dev = client->dev;
152
153 drm_dbg_kms(dev, "%s\n", client->name);
154
155 drm_client_modeset_free(client);
156 drm_client_close(client);
157 drm_dev_put(dev);
158 if (client->funcs)
159 module_put(client->funcs->owner);
160}
161EXPORT_SYMBOL(drm_client_release);
162
163void drm_client_dev_unregister(struct drm_device *dev)
164{
165 struct drm_client_dev *client, *tmp;
166
167 if (!drm_core_check_feature(dev, DRIVER_MODESET))
168 return;
169
170 mutex_lock(&dev->clientlist_mutex);
171 list_for_each_entry_safe(client, tmp, &dev->clientlist, list) {
172 list_del(&client->list);
173 if (client->funcs && client->funcs->unregister) {
174 client->funcs->unregister(client);
175 } else {
176 drm_client_release(client);
177 kfree(client);
178 }
179 }
180 mutex_unlock(&dev->clientlist_mutex);
181}
182
183/**
184 * drm_client_dev_hotplug - Send hotplug event to clients
185 * @dev: DRM device
186 *
187 * This function calls the &drm_client_funcs.hotplug callback on the attached clients.
188 *
189 * drm_kms_helper_hotplug_event() calls this function, so drivers that use it
190 * don't need to call this function themselves.
191 */
192void drm_client_dev_hotplug(struct drm_device *dev)
193{
194 struct drm_client_dev *client;
195 int ret;
196
197 if (!drm_core_check_feature(dev, DRIVER_MODESET))
198 return;
199
200 mutex_lock(&dev->clientlist_mutex);
201 list_for_each_entry(client, &dev->clientlist, list) {
202 if (!client->funcs || !client->funcs->hotplug)
203 continue;
204
205 ret = client->funcs->hotplug(client);
206 drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
207 }
208 mutex_unlock(&dev->clientlist_mutex);
209}
210EXPORT_SYMBOL(drm_client_dev_hotplug);
211
212void drm_client_dev_restore(struct drm_device *dev)
213{
214 struct drm_client_dev *client;
215 int ret;
216
217 if (!drm_core_check_feature(dev, DRIVER_MODESET))
218 return;
219
220 mutex_lock(&dev->clientlist_mutex);
221 list_for_each_entry(client, &dev->clientlist, list) {
222 if (!client->funcs || !client->funcs->restore)
223 continue;
224
225 ret = client->funcs->restore(client);
226 drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
227 if (!ret) /* The first one to return zero gets the privilege to restore */
228 break;
229 }
230 mutex_unlock(&dev->clientlist_mutex);
231}
232
233static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
234{
235 struct drm_device *dev = buffer->client->dev;
236
237 drm_gem_vunmap(buffer->gem, buffer->vaddr);
238
239 if (buffer->gem)
240 drm_gem_object_put(buffer->gem);
241
242 if (buffer->handle)
243 drm_mode_destroy_dumb(dev, buffer->handle, buffer->client->file);
244
245 kfree(buffer);
246}
247
248static struct drm_client_buffer *
249drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
250{
251 const struct drm_format_info *info = drm_format_info(format);
252 struct drm_mode_create_dumb dumb_args = { };
253 struct drm_device *dev = client->dev;
254 struct drm_client_buffer *buffer;
255 struct drm_gem_object *obj;
256 int ret;
257
258 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
259 if (!buffer)
260 return ERR_PTR(-ENOMEM);
261
262 buffer->client = client;
263
264 dumb_args.width = width;
265 dumb_args.height = height;
266 dumb_args.bpp = info->cpp[0] * 8;
267 ret = drm_mode_create_dumb(dev, &dumb_args, client->file);
268 if (ret)
269 goto err_delete;
270
271 buffer->handle = dumb_args.handle;
272 buffer->pitch = dumb_args.pitch;
273
274 obj = drm_gem_object_lookup(client->file, dumb_args.handle);
275 if (!obj) {
276 ret = -ENOENT;
277 goto err_delete;
278 }
279
280 buffer->gem = obj;
281
282 return buffer;
283
284err_delete:
285 drm_client_buffer_delete(buffer);
286
287 return ERR_PTR(ret);
288}
289
290/**
291 * drm_client_buffer_vmap - Map DRM client buffer into address space
292 * @buffer: DRM client buffer
293 *
294 * This function maps a client buffer into kernel address space. If the
295 * buffer is already mapped, it returns the mapping's address.
296 *
297 * Client buffer mappings are not ref'counted. Each call to
298 * drm_client_buffer_vmap() should be followed by a call to
299 * drm_client_buffer_vunmap(); or the client buffer should be mapped
300 * throughout its lifetime.
301 *
302 * Returns:
303 * The mapped memory's address
304 */
305void *drm_client_buffer_vmap(struct drm_client_buffer *buffer)
306{
307 void *vaddr;
308
309 if (buffer->vaddr)
310 return buffer->vaddr;
311
312 /*
313 * FIXME: The dependency on GEM here isn't required, we could
314 * convert the driver handle to a dma-buf instead and use the
315 * backend-agnostic dma-buf vmap support instead. This would
316 * require that the handle2fd prime ioctl is reworked to pull the
317 * fd_install step out of the driver backend hooks, to make that
318 * final step optional for internal users.
319 */
320 vaddr = drm_gem_vmap(buffer->gem);
321 if (IS_ERR(vaddr))
322 return vaddr;
323
324 buffer->vaddr = vaddr;
325
326 return vaddr;
327}
328EXPORT_SYMBOL(drm_client_buffer_vmap);
329
330/**
331 * drm_client_buffer_vunmap - Unmap DRM client buffer
332 * @buffer: DRM client buffer
333 *
334 * This function removes a client buffer's memory mapping. Calling this
335 * function is only required by clients that manage their buffer mappings
336 * by themselves.
337 */
338void drm_client_buffer_vunmap(struct drm_client_buffer *buffer)
339{
340 drm_gem_vunmap(buffer->gem, buffer->vaddr);
341 buffer->vaddr = NULL;
342}
343EXPORT_SYMBOL(drm_client_buffer_vunmap);
344
345static void drm_client_buffer_rmfb(struct drm_client_buffer *buffer)
346{
347 int ret;
348
349 if (!buffer->fb)
350 return;
351
352 ret = drm_mode_rmfb(buffer->client->dev, buffer->fb->base.id, buffer->client->file);
353 if (ret)
354 drm_err(buffer->client->dev,
355 "Error removing FB:%u (%d)\n", buffer->fb->base.id, ret);
356
357 buffer->fb = NULL;
358}
359
360static int drm_client_buffer_addfb(struct drm_client_buffer *buffer,
361 u32 width, u32 height, u32 format)
362{
363 struct drm_client_dev *client = buffer->client;
364 struct drm_mode_fb_cmd fb_req = { };
365 const struct drm_format_info *info;
366 int ret;
367
368 info = drm_format_info(format);
369 fb_req.bpp = info->cpp[0] * 8;
370 fb_req.depth = info->depth;
371 fb_req.width = width;
372 fb_req.height = height;
373 fb_req.handle = buffer->handle;
374 fb_req.pitch = buffer->pitch;
375
376 ret = drm_mode_addfb(client->dev, &fb_req, client->file);
377 if (ret)
378 return ret;
379
380 buffer->fb = drm_framebuffer_lookup(client->dev, buffer->client->file, fb_req.fb_id);
381 if (WARN_ON(!buffer->fb))
382 return -ENOENT;
383
384 /* drop the reference we picked up in framebuffer lookup */
385 drm_framebuffer_put(buffer->fb);
386
387 strscpy(buffer->fb->comm, client->name, TASK_COMM_LEN);
388
389 return 0;
390}
391
392/**
393 * drm_client_framebuffer_create - Create a client framebuffer
394 * @client: DRM client
395 * @width: Framebuffer width
396 * @height: Framebuffer height
397 * @format: Buffer format
398 *
399 * This function creates a &drm_client_buffer which consists of a
400 * &drm_framebuffer backed by a dumb buffer.
401 * Call drm_client_framebuffer_delete() to free the buffer.
402 *
403 * Returns:
404 * Pointer to a client buffer or an error pointer on failure.
405 */
406struct drm_client_buffer *
407drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
408{
409 struct drm_client_buffer *buffer;
410 int ret;
411
412 buffer = drm_client_buffer_create(client, width, height, format);
413 if (IS_ERR(buffer))
414 return buffer;
415
416 ret = drm_client_buffer_addfb(buffer, width, height, format);
417 if (ret) {
418 drm_client_buffer_delete(buffer);
419 return ERR_PTR(ret);
420 }
421
422 return buffer;
423}
424EXPORT_SYMBOL(drm_client_framebuffer_create);
425
426/**
427 * drm_client_framebuffer_delete - Delete a client framebuffer
428 * @buffer: DRM client buffer (can be NULL)
429 */
430void drm_client_framebuffer_delete(struct drm_client_buffer *buffer)
431{
432 if (!buffer)
433 return;
434
435 drm_client_buffer_rmfb(buffer);
436 drm_client_buffer_delete(buffer);
437}
438EXPORT_SYMBOL(drm_client_framebuffer_delete);
439
440/**
441 * drm_client_framebuffer_flush - Manually flush client framebuffer
442 * @buffer: DRM client buffer (can be NULL)
443 * @rect: Damage rectangle (if NULL flushes all)
444 *
445 * This calls &drm_framebuffer_funcs->dirty (if present) to flush buffer changes
446 * for drivers that need it.
447 *
448 * Returns:
449 * Zero on success or negative error code on failure.
450 */
451int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect)
452{
453 if (!buffer || !buffer->fb || !buffer->fb->funcs->dirty)
454 return 0;
455
456 if (rect) {
457 struct drm_clip_rect clip = {
458 .x1 = rect->x1,
459 .y1 = rect->y1,
460 .x2 = rect->x2,
461 .y2 = rect->y2,
462 };
463
464 return buffer->fb->funcs->dirty(buffer->fb, buffer->client->file,
465 0, 0, &clip, 1);
466 }
467
468 return buffer->fb->funcs->dirty(buffer->fb, buffer->client->file,
469 0, 0, NULL, 0);
470}
471EXPORT_SYMBOL(drm_client_framebuffer_flush);
472
473#ifdef CONFIG_DEBUG_FS
474static int drm_client_debugfs_internal_clients(struct seq_file *m, void *data)
475{
476 struct drm_info_node *node = m->private;
477 struct drm_device *dev = node->minor->dev;
478 struct drm_printer p = drm_seq_file_printer(m);
479 struct drm_client_dev *client;
480
481 mutex_lock(&dev->clientlist_mutex);
482 list_for_each_entry(client, &dev->clientlist, list)
483 drm_printf(&p, "%s\n", client->name);
484 mutex_unlock(&dev->clientlist_mutex);
485
486 return 0;
487}
488
489static const struct drm_info_list drm_client_debugfs_list[] = {
490 { "internal_clients", drm_client_debugfs_internal_clients, 0 },
491};
492
493void drm_client_debugfs_init(struct drm_minor *minor)
494{
495 drm_debugfs_create_files(drm_client_debugfs_list,
496 ARRAY_SIZE(drm_client_debugfs_list),
497 minor->debugfs_root, minor);
498}
499#endif
1// SPDX-License-Identifier: GPL-2.0 or MIT
2/*
3 * Copyright 2018 Noralf Trønnes
4 */
5
6#include <linux/iosys-map.h>
7#include <linux/list.h>
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/seq_file.h>
11#include <linux/slab.h>
12
13#include <drm/drm_client.h>
14#include <drm/drm_debugfs.h>
15#include <drm/drm_device.h>
16#include <drm/drm_drv.h>
17#include <drm/drm_file.h>
18#include <drm/drm_fourcc.h>
19#include <drm/drm_framebuffer.h>
20#include <drm/drm_gem.h>
21#include <drm/drm_mode.h>
22#include <drm/drm_print.h>
23
24#include "drm_crtc_internal.h"
25#include "drm_internal.h"
26
27/**
28 * DOC: overview
29 *
30 * This library provides support for clients running in the kernel like fbdev and bootsplash.
31 *
32 * GEM drivers which provide a GEM based dumb buffer with a virtual address are supported.
33 */
34
35static int drm_client_open(struct drm_client_dev *client)
36{
37 struct drm_device *dev = client->dev;
38 struct drm_file *file;
39
40 file = drm_file_alloc(dev->primary);
41 if (IS_ERR(file))
42 return PTR_ERR(file);
43
44 mutex_lock(&dev->filelist_mutex);
45 list_add(&file->lhead, &dev->filelist_internal);
46 mutex_unlock(&dev->filelist_mutex);
47
48 client->file = file;
49
50 return 0;
51}
52
53static void drm_client_close(struct drm_client_dev *client)
54{
55 struct drm_device *dev = client->dev;
56
57 mutex_lock(&dev->filelist_mutex);
58 list_del(&client->file->lhead);
59 mutex_unlock(&dev->filelist_mutex);
60
61 drm_file_free(client->file);
62}
63
64/**
65 * drm_client_init - Initialise a DRM client
66 * @dev: DRM device
67 * @client: DRM client
68 * @name: Client name
69 * @funcs: DRM client functions (optional)
70 *
71 * This initialises the client and opens a &drm_file.
72 * Use drm_client_register() to complete the process.
73 * The caller needs to hold a reference on @dev before calling this function.
74 * The client is freed when the &drm_device is unregistered. See drm_client_release().
75 *
76 * Returns:
77 * Zero on success or negative error code on failure.
78 */
79int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
80 const char *name, const struct drm_client_funcs *funcs)
81{
82 int ret;
83
84 if (!drm_core_check_feature(dev, DRIVER_MODESET) || !dev->driver->dumb_create)
85 return -EOPNOTSUPP;
86
87 if (funcs && !try_module_get(funcs->owner))
88 return -ENODEV;
89
90 client->dev = dev;
91 client->name = name;
92 client->funcs = funcs;
93
94 ret = drm_client_modeset_create(client);
95 if (ret)
96 goto err_put_module;
97
98 ret = drm_client_open(client);
99 if (ret)
100 goto err_free;
101
102 drm_dev_get(dev);
103
104 return 0;
105
106err_free:
107 drm_client_modeset_free(client);
108err_put_module:
109 if (funcs)
110 module_put(funcs->owner);
111
112 return ret;
113}
114EXPORT_SYMBOL(drm_client_init);
115
116/**
117 * drm_client_register - Register client
118 * @client: DRM client
119 *
120 * Add the client to the &drm_device client list to activate its callbacks.
121 * @client must be initialized by a call to drm_client_init(). After
122 * drm_client_register() it is no longer permissible to call drm_client_release()
123 * directly (outside the unregister callback), instead cleanup will happen
124 * automatically on driver unload.
125 */
126void drm_client_register(struct drm_client_dev *client)
127{
128 struct drm_device *dev = client->dev;
129
130 mutex_lock(&dev->clientlist_mutex);
131 list_add(&client->list, &dev->clientlist);
132 mutex_unlock(&dev->clientlist_mutex);
133}
134EXPORT_SYMBOL(drm_client_register);
135
136/**
137 * drm_client_release - Release DRM client resources
138 * @client: DRM client
139 *
140 * Releases resources by closing the &drm_file that was opened by drm_client_init().
141 * It is called automatically if the &drm_client_funcs.unregister callback is _not_ set.
142 *
143 * This function should only be called from the unregister callback. An exception
144 * is fbdev which cannot free the buffer if userspace has open file descriptors.
145 *
146 * Note:
147 * Clients cannot initiate a release by themselves. This is done to keep the code simple.
148 * The driver has to be unloaded before the client can be unloaded.
149 */
150void drm_client_release(struct drm_client_dev *client)
151{
152 struct drm_device *dev = client->dev;
153
154 drm_dbg_kms(dev, "%s\n", client->name);
155
156 drm_client_modeset_free(client);
157 drm_client_close(client);
158 drm_dev_put(dev);
159 if (client->funcs)
160 module_put(client->funcs->owner);
161}
162EXPORT_SYMBOL(drm_client_release);
163
164void drm_client_dev_unregister(struct drm_device *dev)
165{
166 struct drm_client_dev *client, *tmp;
167
168 if (!drm_core_check_feature(dev, DRIVER_MODESET))
169 return;
170
171 mutex_lock(&dev->clientlist_mutex);
172 list_for_each_entry_safe(client, tmp, &dev->clientlist, list) {
173 list_del(&client->list);
174 if (client->funcs && client->funcs->unregister) {
175 client->funcs->unregister(client);
176 } else {
177 drm_client_release(client);
178 kfree(client);
179 }
180 }
181 mutex_unlock(&dev->clientlist_mutex);
182}
183
184/**
185 * drm_client_dev_hotplug - Send hotplug event to clients
186 * @dev: DRM device
187 *
188 * This function calls the &drm_client_funcs.hotplug callback on the attached clients.
189 *
190 * drm_kms_helper_hotplug_event() calls this function, so drivers that use it
191 * don't need to call this function themselves.
192 */
193void drm_client_dev_hotplug(struct drm_device *dev)
194{
195 struct drm_client_dev *client;
196 int ret;
197
198 if (!drm_core_check_feature(dev, DRIVER_MODESET))
199 return;
200
201 mutex_lock(&dev->clientlist_mutex);
202 list_for_each_entry(client, &dev->clientlist, list) {
203 if (!client->funcs || !client->funcs->hotplug)
204 continue;
205
206 ret = client->funcs->hotplug(client);
207 drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
208 }
209 mutex_unlock(&dev->clientlist_mutex);
210}
211EXPORT_SYMBOL(drm_client_dev_hotplug);
212
213void drm_client_dev_restore(struct drm_device *dev)
214{
215 struct drm_client_dev *client;
216 int ret;
217
218 if (!drm_core_check_feature(dev, DRIVER_MODESET))
219 return;
220
221 mutex_lock(&dev->clientlist_mutex);
222 list_for_each_entry(client, &dev->clientlist, list) {
223 if (!client->funcs || !client->funcs->restore)
224 continue;
225
226 ret = client->funcs->restore(client);
227 drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
228 if (!ret) /* The first one to return zero gets the privilege to restore */
229 break;
230 }
231 mutex_unlock(&dev->clientlist_mutex);
232}
233
234static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
235{
236 if (buffer->gem) {
237 drm_gem_vunmap_unlocked(buffer->gem, &buffer->map);
238 drm_gem_object_put(buffer->gem);
239 }
240
241 kfree(buffer);
242}
243
244static struct drm_client_buffer *
245drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height,
246 u32 format, u32 *handle)
247{
248 const struct drm_format_info *info = drm_format_info(format);
249 struct drm_mode_create_dumb dumb_args = { };
250 struct drm_device *dev = client->dev;
251 struct drm_client_buffer *buffer;
252 struct drm_gem_object *obj;
253 int ret;
254
255 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
256 if (!buffer)
257 return ERR_PTR(-ENOMEM);
258
259 buffer->client = client;
260
261 dumb_args.width = width;
262 dumb_args.height = height;
263 dumb_args.bpp = drm_format_info_bpp(info, 0);
264 ret = drm_mode_create_dumb(dev, &dumb_args, client->file);
265 if (ret)
266 goto err_delete;
267
268 obj = drm_gem_object_lookup(client->file, dumb_args.handle);
269 if (!obj) {
270 ret = -ENOENT;
271 goto err_delete;
272 }
273
274 buffer->pitch = dumb_args.pitch;
275 buffer->gem = obj;
276 *handle = dumb_args.handle;
277
278 return buffer;
279
280err_delete:
281 drm_client_buffer_delete(buffer);
282
283 return ERR_PTR(ret);
284}
285
286/**
287 * drm_client_buffer_vmap - Map DRM client buffer into address space
288 * @buffer: DRM client buffer
289 * @map_copy: Returns the mapped memory's address
290 *
291 * This function maps a client buffer into kernel address space. If the
292 * buffer is already mapped, it returns the existing mapping's address.
293 *
294 * Client buffer mappings are not ref'counted. Each call to
295 * drm_client_buffer_vmap() should be followed by a call to
296 * drm_client_buffer_vunmap(); or the client buffer should be mapped
297 * throughout its lifetime.
298 *
299 * The returned address is a copy of the internal value. In contrast to
300 * other vmap interfaces, you don't need it for the client's vunmap
301 * function. So you can modify it at will during blit and draw operations.
302 *
303 * Returns:
304 * 0 on success, or a negative errno code otherwise.
305 */
306int
307drm_client_buffer_vmap(struct drm_client_buffer *buffer,
308 struct iosys_map *map_copy)
309{
310 struct iosys_map *map = &buffer->map;
311 int ret;
312
313 /*
314 * FIXME: The dependency on GEM here isn't required, we could
315 * convert the driver handle to a dma-buf instead and use the
316 * backend-agnostic dma-buf vmap support instead. This would
317 * require that the handle2fd prime ioctl is reworked to pull the
318 * fd_install step out of the driver backend hooks, to make that
319 * final step optional for internal users.
320 */
321 ret = drm_gem_vmap_unlocked(buffer->gem, map);
322 if (ret)
323 return ret;
324
325 *map_copy = *map;
326
327 return 0;
328}
329EXPORT_SYMBOL(drm_client_buffer_vmap);
330
331/**
332 * drm_client_buffer_vunmap - Unmap DRM client buffer
333 * @buffer: DRM client buffer
334 *
335 * This function removes a client buffer's memory mapping. Calling this
336 * function is only required by clients that manage their buffer mappings
337 * by themselves.
338 */
339void drm_client_buffer_vunmap(struct drm_client_buffer *buffer)
340{
341 struct iosys_map *map = &buffer->map;
342
343 drm_gem_vunmap_unlocked(buffer->gem, map);
344}
345EXPORT_SYMBOL(drm_client_buffer_vunmap);
346
347static void drm_client_buffer_rmfb(struct drm_client_buffer *buffer)
348{
349 int ret;
350
351 if (!buffer->fb)
352 return;
353
354 ret = drm_mode_rmfb(buffer->client->dev, buffer->fb->base.id, buffer->client->file);
355 if (ret)
356 drm_err(buffer->client->dev,
357 "Error removing FB:%u (%d)\n", buffer->fb->base.id, ret);
358
359 buffer->fb = NULL;
360}
361
362static int drm_client_buffer_addfb(struct drm_client_buffer *buffer,
363 u32 width, u32 height, u32 format,
364 u32 handle)
365{
366 struct drm_client_dev *client = buffer->client;
367 struct drm_mode_fb_cmd fb_req = { };
368 const struct drm_format_info *info;
369 int ret;
370
371 info = drm_format_info(format);
372 fb_req.bpp = drm_format_info_bpp(info, 0);
373 fb_req.depth = info->depth;
374 fb_req.width = width;
375 fb_req.height = height;
376 fb_req.handle = handle;
377 fb_req.pitch = buffer->pitch;
378
379 ret = drm_mode_addfb(client->dev, &fb_req, client->file);
380 if (ret)
381 return ret;
382
383 buffer->fb = drm_framebuffer_lookup(client->dev, buffer->client->file, fb_req.fb_id);
384 if (WARN_ON(!buffer->fb))
385 return -ENOENT;
386
387 /* drop the reference we picked up in framebuffer lookup */
388 drm_framebuffer_put(buffer->fb);
389
390 strscpy(buffer->fb->comm, client->name, TASK_COMM_LEN);
391
392 return 0;
393}
394
395/**
396 * drm_client_framebuffer_create - Create a client framebuffer
397 * @client: DRM client
398 * @width: Framebuffer width
399 * @height: Framebuffer height
400 * @format: Buffer format
401 *
402 * This function creates a &drm_client_buffer which consists of a
403 * &drm_framebuffer backed by a dumb buffer.
404 * Call drm_client_framebuffer_delete() to free the buffer.
405 *
406 * Returns:
407 * Pointer to a client buffer or an error pointer on failure.
408 */
409struct drm_client_buffer *
410drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
411{
412 struct drm_client_buffer *buffer;
413 u32 handle;
414 int ret;
415
416 buffer = drm_client_buffer_create(client, width, height, format,
417 &handle);
418 if (IS_ERR(buffer))
419 return buffer;
420
421 ret = drm_client_buffer_addfb(buffer, width, height, format, handle);
422
423 /*
424 * The handle is only needed for creating the framebuffer, destroy it
425 * again to solve a circular dependency should anybody export the GEM
426 * object as DMA-buf. The framebuffer and our buffer structure are still
427 * holding references to the GEM object to prevent its destruction.
428 */
429 drm_mode_destroy_dumb(client->dev, handle, client->file);
430
431 if (ret) {
432 drm_client_buffer_delete(buffer);
433 return ERR_PTR(ret);
434 }
435
436 return buffer;
437}
438EXPORT_SYMBOL(drm_client_framebuffer_create);
439
440/**
441 * drm_client_framebuffer_delete - Delete a client framebuffer
442 * @buffer: DRM client buffer (can be NULL)
443 */
444void drm_client_framebuffer_delete(struct drm_client_buffer *buffer)
445{
446 if (!buffer)
447 return;
448
449 drm_client_buffer_rmfb(buffer);
450 drm_client_buffer_delete(buffer);
451}
452EXPORT_SYMBOL(drm_client_framebuffer_delete);
453
454/**
455 * drm_client_framebuffer_flush - Manually flush client framebuffer
456 * @buffer: DRM client buffer (can be NULL)
457 * @rect: Damage rectangle (if NULL flushes all)
458 *
459 * This calls &drm_framebuffer_funcs->dirty (if present) to flush buffer changes
460 * for drivers that need it.
461 *
462 * Returns:
463 * Zero on success or negative error code on failure.
464 */
465int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect)
466{
467 if (!buffer || !buffer->fb || !buffer->fb->funcs->dirty)
468 return 0;
469
470 if (rect) {
471 struct drm_clip_rect clip = {
472 .x1 = rect->x1,
473 .y1 = rect->y1,
474 .x2 = rect->x2,
475 .y2 = rect->y2,
476 };
477
478 return buffer->fb->funcs->dirty(buffer->fb, buffer->client->file,
479 0, 0, &clip, 1);
480 }
481
482 return buffer->fb->funcs->dirty(buffer->fb, buffer->client->file,
483 0, 0, NULL, 0);
484}
485EXPORT_SYMBOL(drm_client_framebuffer_flush);
486
487#ifdef CONFIG_DEBUG_FS
488static int drm_client_debugfs_internal_clients(struct seq_file *m, void *data)
489{
490 struct drm_info_node *node = m->private;
491 struct drm_device *dev = node->minor->dev;
492 struct drm_printer p = drm_seq_file_printer(m);
493 struct drm_client_dev *client;
494
495 mutex_lock(&dev->clientlist_mutex);
496 list_for_each_entry(client, &dev->clientlist, list)
497 drm_printf(&p, "%s\n", client->name);
498 mutex_unlock(&dev->clientlist_mutex);
499
500 return 0;
501}
502
503static const struct drm_info_list drm_client_debugfs_list[] = {
504 { "internal_clients", drm_client_debugfs_internal_clients, 0 },
505};
506
507void drm_client_debugfs_init(struct drm_minor *minor)
508{
509 drm_debugfs_create_files(drm_client_debugfs_list,
510 ARRAY_SIZE(drm_client_debugfs_list),
511 minor->debugfs_root, minor);
512}
513#endif