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Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +02001/*
2 * drm kms/fb cma (contiguous memory allocator) helper functions
3 *
4 * Copyright (C) 2012 Analog Device Inc.
5 * Author: Lars-Peter Clausen <lars@metafoo.de>
6 *
7 * Based on udl_fbdev.c
8 * Copyright (C) 2012 Red Hat
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#include <drm/drmP.h>
21#include <drm/drm_crtc.h>
22#include <drm/drm_fb_helper.h>
23#include <drm/drm_crtc_helper.h>
24#include <drm/drm_gem_cma_helper.h>
25#include <drm/drm_fb_cma_helper.h>
26#include <linux/module.h>
27
28struct drm_fb_cma {
29 struct drm_framebuffer fb;
30 struct drm_gem_cma_object *obj[4];
31};
32
33struct drm_fbdev_cma {
34 struct drm_fb_helper fb_helper;
35 struct drm_fb_cma *fb;
36};
37
38static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
39{
40 return container_of(helper, struct drm_fbdev_cma, fb_helper);
41}
42
43static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
44{
45 return container_of(fb, struct drm_fb_cma, fb);
46}
47
48static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
49{
50 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
51 int i;
52
53 for (i = 0; i < 4; i++) {
54 if (fb_cma->obj[i])
55 drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
56 }
57
58 drm_framebuffer_cleanup(fb);
59 kfree(fb_cma);
60}
61
62static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
63 struct drm_file *file_priv, unsigned int *handle)
64{
65 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
66
67 return drm_gem_handle_create(file_priv,
68 &fb_cma->obj[0]->base, handle);
69}
70
71static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
72 .destroy = drm_fb_cma_destroy,
73 .create_handle = drm_fb_cma_create_handle,
74};
75
76static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
77 struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_cma_object **obj,
78 unsigned int num_planes)
79{
80 struct drm_fb_cma *fb_cma;
81 int ret;
82 int i;
83
84 fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
85 if (!fb_cma)
86 return ERR_PTR(-ENOMEM);
87
Daniel Vetterc7d73f62012-12-13 23:38:38 +010088 drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);
89
90 for (i = 0; i < num_planes; i++)
91 fb_cma->obj[i] = obj[i];
92
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +020093 ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
94 if (ret) {
95 dev_err(dev->dev, "Failed to initalize framebuffer: %d\n", ret);
96 kfree(fb_cma);
97 return ERR_PTR(ret);
98 }
99
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200100 return fb_cma;
101}
102
103/**
104 * drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function
105 *
106 * If your hardware has special alignment or pitch requirements these should be
107 * checked before calling this function.
108 */
109struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
110 struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
111{
112 struct drm_fb_cma *fb_cma;
113 struct drm_gem_cma_object *objs[4];
114 struct drm_gem_object *obj;
115 unsigned int hsub;
116 unsigned int vsub;
117 int ret;
118 int i;
119
120 hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
121 vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
122
123 for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
124 unsigned int width = mode_cmd->width / (i ? hsub : 1);
125 unsigned int height = mode_cmd->height / (i ? vsub : 1);
126 unsigned int min_size;
127
128 obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]);
129 if (!obj) {
130 dev_err(dev->dev, "Failed to lookup GEM object\n");
131 ret = -ENXIO;
132 goto err_gem_object_unreference;
133 }
134
135 min_size = (height - 1) * mode_cmd->pitches[i]
136 + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
137 + mode_cmd->offsets[i];
138
139 if (obj->size < min_size) {
140 drm_gem_object_unreference_unlocked(obj);
141 ret = -EINVAL;
142 goto err_gem_object_unreference;
143 }
144 objs[i] = to_drm_gem_cma_obj(obj);
145 }
146
147 fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i);
148 if (IS_ERR(fb_cma)) {
149 ret = PTR_ERR(fb_cma);
150 goto err_gem_object_unreference;
151 }
152
153 return &fb_cma->fb;
154
155err_gem_object_unreference:
156 for (i--; i >= 0; i--)
157 drm_gem_object_unreference_unlocked(&objs[i]->base);
158 return ERR_PTR(ret);
159}
160EXPORT_SYMBOL_GPL(drm_fb_cma_create);
161
162/**
163 * drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
164 * @fb: The framebuffer
165 * @plane: Which plane
166 *
167 * Return the CMA GEM object for given framebuffer.
168 *
169 * This function will usually be called from the CRTC callback functions.
170 */
171struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
172 unsigned int plane)
173{
174 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
175
176 if (plane >= 4)
177 return NULL;
178
179 return fb_cma->obj[plane];
180}
181EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
182
Rob Clark6f646092012-12-10 10:46:43 -0600183#ifdef CONFIG_DEBUG_FS
184/**
185 * drm_fb_cma_describe() - Helper to dump information about a single
186 * CMA framebuffer object
187 */
188void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
189{
190 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
191 int i, n = drm_format_num_planes(fb->pixel_format);
192
193 seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
194 (char *)&fb->pixel_format);
195
196 for (i = 0; i < n; i++) {
197 seq_printf(m, " %d: offset=%d pitch=%d, obj: ",
198 i, fb->offsets[i], fb->pitches[i]);
199 drm_gem_cma_describe(fb_cma->obj[i], m);
200 }
201}
202EXPORT_SYMBOL_GPL(drm_fb_cma_describe);
203
204/**
205 * drm_fb_cma_debugfs_show() - Helper to list CMA framebuffer objects
206 * in debugfs.
207 */
208int drm_fb_cma_debugfs_show(struct seq_file *m, void *arg)
209{
210 struct drm_info_node *node = (struct drm_info_node *) m->private;
211 struct drm_device *dev = node->minor->dev;
212 struct drm_framebuffer *fb;
213 int ret;
214
215 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
216 if (ret)
217 return ret;
218
219 ret = mutex_lock_interruptible(&dev->struct_mutex);
220 if (ret) {
221 mutex_unlock(&dev->mode_config.mutex);
222 return ret;
223 }
224
225 list_for_each_entry(fb, &dev->mode_config.fb_list, head)
226 drm_fb_cma_describe(fb, m);
227
228 mutex_unlock(&dev->struct_mutex);
229 mutex_unlock(&dev->mode_config.mutex);
230
231 return 0;
232}
233EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
234#endif
235
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200236static struct fb_ops drm_fbdev_cma_ops = {
237 .owner = THIS_MODULE,
238 .fb_fillrect = sys_fillrect,
239 .fb_copyarea = sys_copyarea,
240 .fb_imageblit = sys_imageblit,
241 .fb_check_var = drm_fb_helper_check_var,
242 .fb_set_par = drm_fb_helper_set_par,
243 .fb_blank = drm_fb_helper_blank,
244 .fb_pan_display = drm_fb_helper_pan_display,
245 .fb_setcmap = drm_fb_helper_setcmap,
246};
247
248static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
249 struct drm_fb_helper_surface_size *sizes)
250{
251 struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
252 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
253 struct drm_device *dev = helper->dev;
254 struct drm_gem_cma_object *obj;
255 struct drm_framebuffer *fb;
256 unsigned int bytes_per_pixel;
257 unsigned long offset;
258 struct fb_info *fbi;
259 size_t size;
260 int ret;
261
Thierry Redinge0d78d02012-10-20 10:32:46 +0000262 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200263 sizes->surface_width, sizes->surface_height,
264 sizes->surface_bpp);
265
266 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
267
268 mode_cmd.width = sizes->surface_width;
269 mode_cmd.height = sizes->surface_height;
270 mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
271 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
272 sizes->surface_depth);
273
274 size = mode_cmd.pitches[0] * mode_cmd.height;
275 obj = drm_gem_cma_create(dev, size);
Thierry Reding02813242012-10-20 10:32:47 +0000276 if (IS_ERR(obj))
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200277 return -ENOMEM;
278
279 fbi = framebuffer_alloc(0, dev->dev);
280 if (!fbi) {
281 dev_err(dev->dev, "Failed to allocate framebuffer info.\n");
282 ret = -ENOMEM;
283 goto err_drm_gem_cma_free_object;
284 }
285
286 fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
287 if (IS_ERR(fbdev_cma->fb)) {
288 dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
289 ret = PTR_ERR(fbdev_cma->fb);
290 goto err_framebuffer_release;
291 }
292
293 fb = &fbdev_cma->fb->fb;
294 helper->fb = fb;
295 helper->fbdev = fbi;
296
297 fbi->par = helper;
298 fbi->flags = FBINFO_FLAG_DEFAULT;
299 fbi->fbops = &drm_fbdev_cma_ops;
300
301 ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
302 if (ret) {
303 dev_err(dev->dev, "Failed to allocate color map.\n");
304 goto err_drm_fb_cma_destroy;
305 }
306
307 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
308 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
309
310 offset = fbi->var.xoffset * bytes_per_pixel;
311 offset += fbi->var.yoffset * fb->pitches[0];
312
313 dev->mode_config.fb_base = (resource_size_t)obj->paddr;
314 fbi->screen_base = obj->vaddr + offset;
315 fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
316 fbi->screen_size = size;
317 fbi->fix.smem_len = size;
318
319 return 0;
320
321err_drm_fb_cma_destroy:
Daniel Vetter36206362012-12-10 20:42:17 +0100322 drm_framebuffer_unregister_private(fb);
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200323 drm_fb_cma_destroy(fb);
324err_framebuffer_release:
325 framebuffer_release(fbi);
326err_drm_gem_cma_free_object:
327 drm_gem_cma_free_object(&obj->base);
328 return ret;
329}
330
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200331static struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
Daniel Vettercd5428a2013-01-21 23:42:49 +0100332 .fb_probe = drm_fbdev_cma_create,
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200333};
334
335/**
336 * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
337 * @dev: DRM device
338 * @preferred_bpp: Preferred bits per pixel for the device
339 * @num_crtc: Number of CRTCs
340 * @max_conn_count: Maximum number of connectors
341 *
342 * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
343 */
344struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
345 unsigned int preferred_bpp, unsigned int num_crtc,
346 unsigned int max_conn_count)
347{
348 struct drm_fbdev_cma *fbdev_cma;
349 struct drm_fb_helper *helper;
350 int ret;
351
352 fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
353 if (!fbdev_cma) {
354 dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
355 return ERR_PTR(-ENOMEM);
356 }
357
358 fbdev_cma->fb_helper.funcs = &drm_fb_cma_helper_funcs;
359 helper = &fbdev_cma->fb_helper;
360
361 ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
362 if (ret < 0) {
363 dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
364 goto err_free;
365 }
366
367 ret = drm_fb_helper_single_add_all_connectors(helper);
368 if (ret < 0) {
369 dev_err(dev->dev, "Failed to add connectors.\n");
370 goto err_drm_fb_helper_fini;
371
372 }
373
Daniel Vetter76a39db2013-01-20 23:12:54 +0100374 /* disable all the possible outputs/crtcs before entering KMS mode */
375 drm_helper_disable_unused_functions(dev);
376
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200377 ret = drm_fb_helper_initial_config(helper, preferred_bpp);
378 if (ret < 0) {
379 dev_err(dev->dev, "Failed to set inital hw configuration.\n");
380 goto err_drm_fb_helper_fini;
381 }
382
383 return fbdev_cma;
384
385err_drm_fb_helper_fini:
386 drm_fb_helper_fini(helper);
387err_free:
388 kfree(fbdev_cma);
389
390 return ERR_PTR(ret);
391}
392EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
393
394/**
395 * drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
396 * @fbdev_cma: The drm_fbdev_cma struct
397 */
398void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
399{
400 if (fbdev_cma->fb_helper.fbdev) {
401 struct fb_info *info;
402 int ret;
403
404 info = fbdev_cma->fb_helper.fbdev;
405 ret = unregister_framebuffer(info);
406 if (ret < 0)
407 DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
408
409 if (info->cmap.len)
410 fb_dealloc_cmap(&info->cmap);
411
412 framebuffer_release(info);
413 }
414
Daniel Vetter36206362012-12-10 20:42:17 +0100415 if (fbdev_cma->fb) {
416 drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200417 drm_fb_cma_destroy(&fbdev_cma->fb->fb);
Daniel Vetter36206362012-12-10 20:42:17 +0100418 }
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200419
420 drm_fb_helper_fini(&fbdev_cma->fb_helper);
421 kfree(fbdev_cma);
422}
423EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);
424
425/**
426 * drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
427 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
428 *
429 * This function is usually called from the DRM drivers lastclose callback.
430 */
431void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
432{
Daniel Vetter8fcb6c42013-02-19 11:18:04 +0100433 if (fbdev_cma) {
434 struct drm_device *dev = fbdev_cma->fb_helper.dev;
435
436 drm_modeset_lock_all(dev);
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200437 drm_fb_helper_restore_fbdev_mode(&fbdev_cma->fb_helper);
Daniel Vetter8fcb6c42013-02-19 11:18:04 +0100438 drm_modeset_unlock_all(dev);
439 }
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200440}
441EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);
442
443/**
444 * drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
445 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
446 *
447 * This function is usually called from the DRM drivers output_poll_changed
448 * callback.
449 */
450void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
451{
452 if (fbdev_cma)
453 drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
454}
455EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);