xref: /linux/drivers/gpu/drm/radeon/radeon_fbdev.c (revision dfd4b508c8c6106083698a0dd5e35aecc7c48725)
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 
radeon_fbdev_destroy_pinned_object(struct drm_gem_object * gobj)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 
radeon_fbdev_create_pinned_object(struct drm_fb_helper * fb_helper,const struct drm_format_info * info,struct drm_mode_fb_cmd2 * mode_cmd,struct drm_gem_object ** gobj_p)55 static int radeon_fbdev_create_pinned_object(struct drm_fb_helper *fb_helper,
56 					     const struct drm_format_info *info,
57 					     struct drm_mode_fb_cmd2 *mode_cmd,
58 					     struct drm_gem_object **gobj_p)
59 {
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 	cpp = info->cpp[0];
71 
72 	/* need to align pitch with crtc limits */
73 	mode_cmd->pitches[0] = radeon_align_pitch(rdev, mode_cmd->width, cpp,
74 						  fb_tiled);
75 
76 	if (rdev->family >= CHIP_R600)
77 		height = ALIGN(mode_cmd->height, 8);
78 	size = mode_cmd->pitches[0] * height;
79 	aligned_size = ALIGN(size, PAGE_SIZE);
80 	ret = radeon_gem_object_create(rdev, aligned_size, 0,
81 				       RADEON_GEM_DOMAIN_VRAM,
82 				       0, true, &gobj);
83 	if (ret) {
84 		pr_err("failed to allocate framebuffer (%d)\n", aligned_size);
85 		return -ENOMEM;
86 	}
87 	rbo = gem_to_radeon_bo(gobj);
88 
89 	if (fb_tiled)
90 		tiling_flags = RADEON_TILING_MACRO;
91 
92 #ifdef __BIG_ENDIAN
93 	switch (cpp) {
94 	case 4:
95 		tiling_flags |= RADEON_TILING_SWAP_32BIT;
96 		break;
97 	case 2:
98 		tiling_flags |= RADEON_TILING_SWAP_16BIT;
99 		break;
100 	default:
101 		break;
102 	}
103 #endif
104 
105 	if (tiling_flags) {
106 		ret = radeon_bo_set_tiling_flags(rbo,
107 						 tiling_flags | RADEON_TILING_SURFACE,
108 						 mode_cmd->pitches[0]);
109 		if (ret)
110 			dev_err(rdev->dev, "FB failed to set tiling flags\n");
111 	}
112 
113 	ret = radeon_bo_reserve(rbo, false);
114 	if (unlikely(ret != 0))
115 		goto err_radeon_fbdev_destroy_pinned_object;
116 	/* Only 27 bit offset for legacy CRTC */
117 	ret = radeon_bo_pin_restricted(rbo, RADEON_GEM_DOMAIN_VRAM,
118 				       ASIC_IS_AVIVO(rdev) ? 0 : 1 << 27,
119 				       NULL);
120 	if (ret) {
121 		radeon_bo_unreserve(rbo);
122 		goto err_radeon_fbdev_destroy_pinned_object;
123 	}
124 	if (fb_tiled)
125 		radeon_bo_check_tiling(rbo, 0, 0);
126 	ret = radeon_bo_kmap(rbo, NULL);
127 	radeon_bo_unreserve(rbo);
128 	if (ret)
129 		goto err_radeon_fbdev_destroy_pinned_object;
130 
131 	*gobj_p = gobj;
132 	return 0;
133 
134 err_radeon_fbdev_destroy_pinned_object:
135 	radeon_fbdev_destroy_pinned_object(gobj);
136 	*gobj_p = NULL;
137 	return ret;
138 }
139 
140 /*
141  * Fbdev ops and struct fb_ops
142  */
143 
radeon_fbdev_fb_open(struct fb_info * info,int user)144 static int radeon_fbdev_fb_open(struct fb_info *info, int user)
145 {
146 	struct drm_fb_helper *fb_helper = info->par;
147 	struct radeon_device *rdev = fb_helper->dev->dev_private;
148 	int ret;
149 
150 	ret = pm_runtime_get_sync(rdev_to_drm(rdev)->dev);
151 	if (ret < 0 && ret != -EACCES)
152 		goto err_pm_runtime_mark_last_busy;
153 
154 	return 0;
155 
156 err_pm_runtime_mark_last_busy:
157 	pm_runtime_mark_last_busy(rdev_to_drm(rdev)->dev);
158 	pm_runtime_put_autosuspend(rdev_to_drm(rdev)->dev);
159 	return ret;
160 }
161 
radeon_fbdev_fb_release(struct fb_info * info,int user)162 static int radeon_fbdev_fb_release(struct fb_info *info, int user)
163 {
164 	struct drm_fb_helper *fb_helper = info->par;
165 	struct radeon_device *rdev = fb_helper->dev->dev_private;
166 
167 	pm_runtime_mark_last_busy(rdev_to_drm(rdev)->dev);
168 	pm_runtime_put_autosuspend(rdev_to_drm(rdev)->dev);
169 
170 	return 0;
171 }
172 
radeon_fbdev_fb_destroy(struct fb_info * info)173 static void radeon_fbdev_fb_destroy(struct fb_info *info)
174 {
175 	struct drm_fb_helper *fb_helper = info->par;
176 	struct drm_framebuffer *fb = fb_helper->fb;
177 	struct drm_gem_object *gobj = drm_gem_fb_get_obj(fb, 0);
178 
179 	drm_fb_helper_fini(fb_helper);
180 
181 	drm_framebuffer_unregister_private(fb);
182 	drm_framebuffer_cleanup(fb);
183 	kfree(fb);
184 	radeon_fbdev_destroy_pinned_object(gobj);
185 
186 	drm_client_release(&fb_helper->client);
187 	drm_fb_helper_unprepare(fb_helper);
188 	kfree(fb_helper);
189 }
190 
191 static const struct fb_ops radeon_fbdev_fb_ops = {
192 	.owner = THIS_MODULE,
193 	.fb_open = radeon_fbdev_fb_open,
194 	.fb_release = radeon_fbdev_fb_release,
195 	FB_DEFAULT_IOMEM_OPS,
196 	DRM_FB_HELPER_DEFAULT_OPS,
197 	.fb_destroy = radeon_fbdev_fb_destroy,
198 };
199 
200 static const struct drm_fb_helper_funcs radeon_fbdev_fb_helper_funcs = {
201 };
202 
radeon_fbdev_driver_fbdev_probe(struct drm_fb_helper * fb_helper,struct drm_fb_helper_surface_size * sizes)203 int radeon_fbdev_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
204 				    struct drm_fb_helper_surface_size *sizes)
205 {
206 	struct radeon_device *rdev = fb_helper->dev->dev_private;
207 	const struct drm_format_info *format_info;
208 	struct drm_mode_fb_cmd2 mode_cmd = { };
209 	struct fb_info *info;
210 	struct drm_gem_object *gobj;
211 	struct radeon_bo *rbo;
212 	struct drm_framebuffer *fb;
213 	int ret;
214 	unsigned long tmp;
215 
216 	mode_cmd.width = sizes->surface_width;
217 	mode_cmd.height = sizes->surface_height;
218 
219 	/* avivo can't scanout real 24bpp */
220 	if ((sizes->surface_bpp == 24) && ASIC_IS_AVIVO(rdev))
221 		sizes->surface_bpp = 32;
222 
223 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
224 							  sizes->surface_depth);
225 
226 	format_info = drm_get_format_info(rdev_to_drm(rdev), mode_cmd.pixel_format,
227 					  mode_cmd.modifier[0]);
228 	ret = radeon_fbdev_create_pinned_object(fb_helper, format_info, &mode_cmd, &gobj);
229 	if (ret) {
230 		DRM_ERROR("failed to create fbcon object %d\n", ret);
231 		return ret;
232 	}
233 	rbo = gem_to_radeon_bo(gobj);
234 
235 	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
236 	if (!fb) {
237 		ret = -ENOMEM;
238 		goto err_radeon_fbdev_destroy_pinned_object;
239 	}
240 	ret = radeon_framebuffer_init(rdev_to_drm(rdev), fb, format_info, &mode_cmd, gobj);
241 	if (ret) {
242 		DRM_ERROR("failed to initialize framebuffer %d\n", ret);
243 		goto err_kfree;
244 	}
245 
246 	/* setup helper */
247 	fb_helper->funcs = &radeon_fbdev_fb_helper_funcs;
248 	fb_helper->fb = fb;
249 
250 	/* okay we have an object now allocate the framebuffer */
251 	info = drm_fb_helper_alloc_info(fb_helper);
252 	if (IS_ERR(info)) {
253 		ret = PTR_ERR(info);
254 		goto err_drm_framebuffer_unregister_private;
255 	}
256 
257 	info->fbops = &radeon_fbdev_fb_ops;
258 
259 	/* radeon resume is fragile and needs a vt switch to help it along */
260 	info->skip_vt_switch = false;
261 
262 	drm_fb_helper_fill_info(info, fb_helper, sizes);
263 
264 	tmp = radeon_bo_gpu_offset(rbo) - rdev->mc.vram_start;
265 	info->fix.smem_start = rdev->mc.aper_base + tmp;
266 	info->fix.smem_len = radeon_bo_size(rbo);
267 	info->screen_base = (__force void __iomem *)rbo->kptr;
268 	info->screen_size = radeon_bo_size(rbo);
269 
270 	memset_io(info->screen_base, 0, info->screen_size);
271 
272 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
273 
274 	DRM_INFO("fb mappable at 0x%lX\n",  info->fix.smem_start);
275 	DRM_INFO("vram apper at 0x%lX\n",  (unsigned long)rdev->mc.aper_base);
276 	DRM_INFO("size %lu\n", (unsigned long)radeon_bo_size(rbo));
277 	DRM_INFO("fb depth is %d\n", fb->format->depth);
278 	DRM_INFO("   pitch is %d\n", fb->pitches[0]);
279 
280 	return 0;
281 
282 err_drm_framebuffer_unregister_private:
283 	fb_helper->fb = NULL;
284 	drm_framebuffer_unregister_private(fb);
285 	drm_framebuffer_cleanup(fb);
286 err_kfree:
287 	kfree(fb);
288 err_radeon_fbdev_destroy_pinned_object:
289 	radeon_fbdev_destroy_pinned_object(gobj);
290 	return ret;
291 }
292 
radeon_fbdev_robj_is_fb(struct radeon_device * rdev,struct radeon_bo * robj)293 bool radeon_fbdev_robj_is_fb(struct radeon_device *rdev, struct radeon_bo *robj)
294 {
295 	struct drm_fb_helper *fb_helper = rdev_to_drm(rdev)->fb_helper;
296 	struct drm_gem_object *gobj;
297 
298 	if (!fb_helper)
299 		return false;
300 
301 	gobj = drm_gem_fb_get_obj(fb_helper->fb, 0);
302 	if (!gobj)
303 		return false;
304 	if (gobj != &robj->tbo.base)
305 		return false;
306 
307 	return true;
308 }
309