1 /*
2  * Copyright © 2007 David Airlie
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  *
23  * Authors:
24  *     David Airlie
25  */
26 
27 #include <linux/fb.h>
28 #include <linux/pci.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/vga_switcheroo.h>
31 
32 #include <drm/drm_crtc_helper.h>
33 #include <drm/drm_drv.h>
34 #include <drm/drm_fb_helper.h>
35 #include <drm/drm_fourcc.h>
36 #include <drm/drm_framebuffer.h>
37 #include <drm/drm_gem_framebuffer_helper.h>
38 
39 #include "radeon.h"
40 
41 static void radeon_fbdev_destroy_pinned_object(struct drm_gem_object *gobj)
42 {
43 	struct radeon_bo *rbo = gem_to_radeon_bo(gobj);
44 	int ret;
45 
46 	ret = radeon_bo_reserve(rbo, false);
47 	if (likely(ret == 0)) {
48 		radeon_bo_kunmap(rbo);
49 		radeon_bo_unpin(rbo);
50 		radeon_bo_unreserve(rbo);
51 	}
52 	drm_gem_object_put(gobj);
53 }
54 
55 static int radeon_fbdev_create_pinned_object(struct drm_fb_helper *fb_helper,
56 					     struct drm_mode_fb_cmd2 *mode_cmd,
57 					     struct drm_gem_object **gobj_p)
58 {
59 	const struct drm_format_info *info;
60 	struct radeon_device *rdev = fb_helper->dev->dev_private;
61 	struct drm_gem_object *gobj = NULL;
62 	struct radeon_bo *rbo = NULL;
63 	bool fb_tiled = false; /* useful for testing */
64 	u32 tiling_flags = 0;
65 	int ret;
66 	int aligned_size, size;
67 	int height = mode_cmd->height;
68 	u32 cpp;
69 
70 	info = drm_get_format_info(rdev->ddev, mode_cmd);
71 	cpp = info->cpp[0];
72 
73 	/* need to align pitch with crtc limits */
74 	mode_cmd->pitches[0] = radeon_align_pitch(rdev, mode_cmd->width, cpp,
75 						  fb_tiled);
76 
77 	if (rdev->family >= CHIP_R600)
78 		height = ALIGN(mode_cmd->height, 8);
79 	size = mode_cmd->pitches[0] * height;
80 	aligned_size = ALIGN(size, PAGE_SIZE);
81 	ret = radeon_gem_object_create(rdev, aligned_size, 0,
82 				       RADEON_GEM_DOMAIN_VRAM,
83 				       0, true, &gobj);
84 	if (ret) {
85 		pr_err("failed to allocate framebuffer (%d)\n", aligned_size);
86 		return -ENOMEM;
87 	}
88 	rbo = gem_to_radeon_bo(gobj);
89 
90 	if (fb_tiled)
91 		tiling_flags = RADEON_TILING_MACRO;
92 
93 #ifdef __BIG_ENDIAN
94 	switch (cpp) {
95 	case 4:
96 		tiling_flags |= RADEON_TILING_SWAP_32BIT;
97 		break;
98 	case 2:
99 		tiling_flags |= RADEON_TILING_SWAP_16BIT;
100 		break;
101 	default:
102 		break;
103 	}
104 #endif
105 
106 	if (tiling_flags) {
107 		ret = radeon_bo_set_tiling_flags(rbo,
108 						 tiling_flags | RADEON_TILING_SURFACE,
109 						 mode_cmd->pitches[0]);
110 		if (ret)
111 			dev_err(rdev->dev, "FB failed to set tiling flags\n");
112 	}
113 
114 	ret = radeon_bo_reserve(rbo, false);
115 	if (unlikely(ret != 0))
116 		goto err_radeon_fbdev_destroy_pinned_object;
117 	/* Only 27 bit offset for legacy CRTC */
118 	ret = radeon_bo_pin_restricted(rbo, RADEON_GEM_DOMAIN_VRAM,
119 				       ASIC_IS_AVIVO(rdev) ? 0 : 1 << 27,
120 				       NULL);
121 	if (ret) {
122 		radeon_bo_unreserve(rbo);
123 		goto err_radeon_fbdev_destroy_pinned_object;
124 	}
125 	if (fb_tiled)
126 		radeon_bo_check_tiling(rbo, 0, 0);
127 	ret = radeon_bo_kmap(rbo, NULL);
128 	radeon_bo_unreserve(rbo);
129 	if (ret)
130 		goto err_radeon_fbdev_destroy_pinned_object;
131 
132 	*gobj_p = gobj;
133 	return 0;
134 
135 err_radeon_fbdev_destroy_pinned_object:
136 	radeon_fbdev_destroy_pinned_object(gobj);
137 	*gobj_p = NULL;
138 	return ret;
139 }
140 
141 /*
142  * Fbdev ops and struct fb_ops
143  */
144 
145 static int radeon_fbdev_fb_open(struct fb_info *info, int user)
146 {
147 	struct drm_fb_helper *fb_helper = info->par;
148 	struct radeon_device *rdev = fb_helper->dev->dev_private;
149 	int ret;
150 
151 	ret = pm_runtime_get_sync(rdev->ddev->dev);
152 	if (ret < 0 && ret != -EACCES)
153 		goto err_pm_runtime_mark_last_busy;
154 
155 	return 0;
156 
157 err_pm_runtime_mark_last_busy:
158 	pm_runtime_mark_last_busy(rdev->ddev->dev);
159 	pm_runtime_put_autosuspend(rdev->ddev->dev);
160 	return ret;
161 }
162 
163 static int radeon_fbdev_fb_release(struct fb_info *info, int user)
164 {
165 	struct drm_fb_helper *fb_helper = info->par;
166 	struct radeon_device *rdev = fb_helper->dev->dev_private;
167 
168 	pm_runtime_mark_last_busy(rdev->ddev->dev);
169 	pm_runtime_put_autosuspend(rdev->ddev->dev);
170 
171 	return 0;
172 }
173 
174 static void radeon_fbdev_fb_destroy(struct fb_info *info)
175 {
176 	struct drm_fb_helper *fb_helper = info->par;
177 	struct drm_framebuffer *fb = fb_helper->fb;
178 	struct drm_gem_object *gobj = drm_gem_fb_get_obj(fb, 0);
179 
180 	drm_fb_helper_fini(fb_helper);
181 
182 	drm_framebuffer_unregister_private(fb);
183 	drm_framebuffer_cleanup(fb);
184 	kfree(fb);
185 	radeon_fbdev_destroy_pinned_object(gobj);
186 
187 	drm_client_release(&fb_helper->client);
188 	drm_fb_helper_unprepare(fb_helper);
189 	kfree(fb_helper);
190 }
191 
192 static const struct fb_ops radeon_fbdev_fb_ops = {
193 	.owner = THIS_MODULE,
194 	.fb_open = radeon_fbdev_fb_open,
195 	.fb_release = radeon_fbdev_fb_release,
196 	FB_DEFAULT_IOMEM_OPS,
197 	DRM_FB_HELPER_DEFAULT_OPS,
198 	.fb_destroy = radeon_fbdev_fb_destroy,
199 };
200 
201 /*
202  * Fbdev helpers and struct drm_fb_helper_funcs
203  */
204 
205 static int radeon_fbdev_fb_helper_fb_probe(struct drm_fb_helper *fb_helper,
206 					   struct drm_fb_helper_surface_size *sizes)
207 {
208 	struct radeon_device *rdev = fb_helper->dev->dev_private;
209 	struct drm_mode_fb_cmd2 mode_cmd = { };
210 	struct fb_info *info;
211 	struct drm_gem_object *gobj;
212 	struct radeon_bo *rbo;
213 	struct drm_framebuffer *fb;
214 	int ret;
215 	unsigned long tmp;
216 
217 	mode_cmd.width = sizes->surface_width;
218 	mode_cmd.height = sizes->surface_height;
219 
220 	/* avivo can't scanout real 24bpp */
221 	if ((sizes->surface_bpp == 24) && ASIC_IS_AVIVO(rdev))
222 		sizes->surface_bpp = 32;
223 
224 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
225 							  sizes->surface_depth);
226 
227 	ret = radeon_fbdev_create_pinned_object(fb_helper, &mode_cmd, &gobj);
228 	if (ret) {
229 		DRM_ERROR("failed to create fbcon object %d\n", ret);
230 		return ret;
231 	}
232 	rbo = gem_to_radeon_bo(gobj);
233 
234 	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
235 	if (!fb) {
236 		ret = -ENOMEM;
237 		goto err_radeon_fbdev_destroy_pinned_object;
238 	}
239 	ret = radeon_framebuffer_init(rdev->ddev, fb, &mode_cmd, gobj);
240 	if (ret) {
241 		DRM_ERROR("failed to initialize framebuffer %d\n", ret);
242 		goto err_kfree;
243 	}
244 
245 	/* setup helper */
246 	fb_helper->fb = fb;
247 
248 	/* okay we have an object now allocate the framebuffer */
249 	info = drm_fb_helper_alloc_info(fb_helper);
250 	if (IS_ERR(info)) {
251 		ret = PTR_ERR(info);
252 		goto err_drm_framebuffer_unregister_private;
253 	}
254 
255 	info->fbops = &radeon_fbdev_fb_ops;
256 
257 	/* radeon resume is fragile and needs a vt switch to help it along */
258 	info->skip_vt_switch = false;
259 
260 	drm_fb_helper_fill_info(info, fb_helper, sizes);
261 
262 	tmp = radeon_bo_gpu_offset(rbo) - rdev->mc.vram_start;
263 	info->fix.smem_start = rdev->mc.aper_base + tmp;
264 	info->fix.smem_len = radeon_bo_size(rbo);
265 	info->screen_base = (__force void __iomem *)rbo->kptr;
266 	info->screen_size = radeon_bo_size(rbo);
267 
268 	memset_io(info->screen_base, 0, info->screen_size);
269 
270 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
271 
272 	DRM_INFO("fb mappable at 0x%lX\n",  info->fix.smem_start);
273 	DRM_INFO("vram apper at 0x%lX\n",  (unsigned long)rdev->mc.aper_base);
274 	DRM_INFO("size %lu\n", (unsigned long)radeon_bo_size(rbo));
275 	DRM_INFO("fb depth is %d\n", fb->format->depth);
276 	DRM_INFO("   pitch is %d\n", fb->pitches[0]);
277 
278 	return 0;
279 
280 err_drm_framebuffer_unregister_private:
281 	fb_helper->fb = NULL;
282 	drm_framebuffer_unregister_private(fb);
283 	drm_framebuffer_cleanup(fb);
284 err_kfree:
285 	kfree(fb);
286 err_radeon_fbdev_destroy_pinned_object:
287 	radeon_fbdev_destroy_pinned_object(gobj);
288 	return ret;
289 }
290 
291 static const struct drm_fb_helper_funcs radeon_fbdev_fb_helper_funcs = {
292 	.fb_probe = radeon_fbdev_fb_helper_fb_probe,
293 };
294 
295 /*
296  * Fbdev client and struct drm_client_funcs
297  */
298 
299 static void radeon_fbdev_client_unregister(struct drm_client_dev *client)
300 {
301 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
302 	struct drm_device *dev = fb_helper->dev;
303 	struct radeon_device *rdev = dev->dev_private;
304 
305 	if (fb_helper->info) {
306 		vga_switcheroo_client_fb_set(rdev->pdev, NULL);
307 		drm_helper_force_disable_all(dev);
308 		drm_fb_helper_unregister_info(fb_helper);
309 	} else {
310 		drm_client_release(&fb_helper->client);
311 		drm_fb_helper_unprepare(fb_helper);
312 		kfree(fb_helper);
313 	}
314 }
315 
316 static int radeon_fbdev_client_restore(struct drm_client_dev *client)
317 {
318 	drm_fb_helper_lastclose(client->dev);
319 	vga_switcheroo_process_delayed_switch();
320 
321 	return 0;
322 }
323 
324 static int radeon_fbdev_client_hotplug(struct drm_client_dev *client)
325 {
326 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
327 	struct drm_device *dev = client->dev;
328 	struct radeon_device *rdev = dev->dev_private;
329 	int ret;
330 
331 	if (dev->fb_helper)
332 		return drm_fb_helper_hotplug_event(dev->fb_helper);
333 
334 	ret = drm_fb_helper_init(dev, fb_helper);
335 	if (ret)
336 		goto err_drm_err;
337 
338 	if (!drm_drv_uses_atomic_modeset(dev))
339 		drm_helper_disable_unused_functions(dev);
340 
341 	ret = drm_fb_helper_initial_config(fb_helper);
342 	if (ret)
343 		goto err_drm_fb_helper_fini;
344 
345 	vga_switcheroo_client_fb_set(rdev->pdev, fb_helper->info);
346 
347 	return 0;
348 
349 err_drm_fb_helper_fini:
350 	drm_fb_helper_fini(fb_helper);
351 err_drm_err:
352 	drm_err(dev, "Failed to setup radeon fbdev emulation (ret=%d)\n", ret);
353 	return ret;
354 }
355 
356 static const struct drm_client_funcs radeon_fbdev_client_funcs = {
357 	.owner		= THIS_MODULE,
358 	.unregister	= radeon_fbdev_client_unregister,
359 	.restore	= radeon_fbdev_client_restore,
360 	.hotplug	= radeon_fbdev_client_hotplug,
361 };
362 
363 void radeon_fbdev_setup(struct radeon_device *rdev)
364 {
365 	struct drm_fb_helper *fb_helper;
366 	int bpp_sel = 32;
367 	int ret;
368 
369 	if (rdev->mc.real_vram_size <= (8 * 1024 * 1024))
370 		bpp_sel = 8;
371 	else if (ASIC_IS_RN50(rdev) || rdev->mc.real_vram_size <= (32 * 1024 * 1024))
372 		bpp_sel = 16;
373 
374 	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
375 	if (!fb_helper)
376 		return;
377 	drm_fb_helper_prepare(rdev->ddev, fb_helper, bpp_sel, &radeon_fbdev_fb_helper_funcs);
378 
379 	ret = drm_client_init(rdev->ddev, &fb_helper->client, "radeon-fbdev",
380 			      &radeon_fbdev_client_funcs);
381 	if (ret) {
382 		drm_err(rdev->ddev, "Failed to register client: %d\n", ret);
383 		goto err_drm_client_init;
384 	}
385 
386 	drm_client_register(&fb_helper->client);
387 
388 	return;
389 
390 err_drm_client_init:
391 	drm_fb_helper_unprepare(fb_helper);
392 	kfree(fb_helper);
393 }
394 
395 void radeon_fbdev_set_suspend(struct radeon_device *rdev, int state)
396 {
397 	if (rdev->ddev->fb_helper)
398 		drm_fb_helper_set_suspend(rdev->ddev->fb_helper, state);
399 }
400 
401 bool radeon_fbdev_robj_is_fb(struct radeon_device *rdev, struct radeon_bo *robj)
402 {
403 	struct drm_fb_helper *fb_helper = rdev->ddev->fb_helper;
404 	struct drm_gem_object *gobj;
405 
406 	if (!fb_helper)
407 		return false;
408 
409 	gobj = drm_gem_fb_get_obj(fb_helper->fb, 0);
410 	if (!gobj)
411 		return false;
412 	if (gobj != &robj->tbo.base)
413 		return false;
414 
415 	return true;
416 }
417