xref: /linux/drivers/gpu/drm/radeon/radeon_fbdev.c (revision 260f6f4fda93c8485c8037865c941b42b9cba5d2)
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_to_drm(rdev), mode_cmd->pixel_format,
71 				   mode_cmd->modifier[0]);
72 	cpp = info->cpp[0];
73 
74 	/* need to align pitch with crtc limits */
75 	mode_cmd->pitches[0] = radeon_align_pitch(rdev, mode_cmd->width, cpp,
76 						  fb_tiled);
77 
78 	if (rdev->family >= CHIP_R600)
79 		height = ALIGN(mode_cmd->height, 8);
80 	size = mode_cmd->pitches[0] * height;
81 	aligned_size = ALIGN(size, PAGE_SIZE);
82 	ret = radeon_gem_object_create(rdev, aligned_size, 0,
83 				       RADEON_GEM_DOMAIN_VRAM,
84 				       0, true, &gobj);
85 	if (ret) {
86 		pr_err("failed to allocate framebuffer (%d)\n", aligned_size);
87 		return -ENOMEM;
88 	}
89 	rbo = gem_to_radeon_bo(gobj);
90 
91 	if (fb_tiled)
92 		tiling_flags = RADEON_TILING_MACRO;
93 
94 #ifdef __BIG_ENDIAN
95 	switch (cpp) {
96 	case 4:
97 		tiling_flags |= RADEON_TILING_SWAP_32BIT;
98 		break;
99 	case 2:
100 		tiling_flags |= RADEON_TILING_SWAP_16BIT;
101 		break;
102 	default:
103 		break;
104 	}
105 #endif
106 
107 	if (tiling_flags) {
108 		ret = radeon_bo_set_tiling_flags(rbo,
109 						 tiling_flags | RADEON_TILING_SURFACE,
110 						 mode_cmd->pitches[0]);
111 		if (ret)
112 			dev_err(rdev->dev, "FB failed to set tiling flags\n");
113 	}
114 
115 	ret = radeon_bo_reserve(rbo, false);
116 	if (unlikely(ret != 0))
117 		goto err_radeon_fbdev_destroy_pinned_object;
118 	/* Only 27 bit offset for legacy CRTC */
119 	ret = radeon_bo_pin_restricted(rbo, RADEON_GEM_DOMAIN_VRAM,
120 				       ASIC_IS_AVIVO(rdev) ? 0 : 1 << 27,
121 				       NULL);
122 	if (ret) {
123 		radeon_bo_unreserve(rbo);
124 		goto err_radeon_fbdev_destroy_pinned_object;
125 	}
126 	if (fb_tiled)
127 		radeon_bo_check_tiling(rbo, 0, 0);
128 	ret = radeon_bo_kmap(rbo, NULL);
129 	radeon_bo_unreserve(rbo);
130 	if (ret)
131 		goto err_radeon_fbdev_destroy_pinned_object;
132 
133 	*gobj_p = gobj;
134 	return 0;
135 
136 err_radeon_fbdev_destroy_pinned_object:
137 	radeon_fbdev_destroy_pinned_object(gobj);
138 	*gobj_p = NULL;
139 	return ret;
140 }
141 
142 /*
143  * Fbdev ops and struct fb_ops
144  */
145 
146 static int radeon_fbdev_fb_open(struct fb_info *info, int user)
147 {
148 	struct drm_fb_helper *fb_helper = info->par;
149 	struct radeon_device *rdev = fb_helper->dev->dev_private;
150 	int ret;
151 
152 	ret = pm_runtime_get_sync(rdev_to_drm(rdev)->dev);
153 	if (ret < 0 && ret != -EACCES)
154 		goto err_pm_runtime_mark_last_busy;
155 
156 	return 0;
157 
158 err_pm_runtime_mark_last_busy:
159 	pm_runtime_mark_last_busy(rdev_to_drm(rdev)->dev);
160 	pm_runtime_put_autosuspend(rdev_to_drm(rdev)->dev);
161 	return ret;
162 }
163 
164 static int radeon_fbdev_fb_release(struct fb_info *info, int user)
165 {
166 	struct drm_fb_helper *fb_helper = info->par;
167 	struct radeon_device *rdev = fb_helper->dev->dev_private;
168 
169 	pm_runtime_mark_last_busy(rdev_to_drm(rdev)->dev);
170 	pm_runtime_put_autosuspend(rdev_to_drm(rdev)->dev);
171 
172 	return 0;
173 }
174 
175 static void radeon_fbdev_fb_destroy(struct fb_info *info)
176 {
177 	struct drm_fb_helper *fb_helper = info->par;
178 	struct drm_framebuffer *fb = fb_helper->fb;
179 	struct drm_gem_object *gobj = drm_gem_fb_get_obj(fb, 0);
180 
181 	drm_fb_helper_fini(fb_helper);
182 
183 	drm_framebuffer_unregister_private(fb);
184 	drm_framebuffer_cleanup(fb);
185 	kfree(fb);
186 	radeon_fbdev_destroy_pinned_object(gobj);
187 
188 	drm_client_release(&fb_helper->client);
189 	drm_fb_helper_unprepare(fb_helper);
190 	kfree(fb_helper);
191 }
192 
193 static const struct fb_ops radeon_fbdev_fb_ops = {
194 	.owner = THIS_MODULE,
195 	.fb_open = radeon_fbdev_fb_open,
196 	.fb_release = radeon_fbdev_fb_release,
197 	FB_DEFAULT_IOMEM_OPS,
198 	DRM_FB_HELPER_DEFAULT_OPS,
199 	.fb_destroy = radeon_fbdev_fb_destroy,
200 };
201 
202 static const struct drm_fb_helper_funcs radeon_fbdev_fb_helper_funcs = {
203 };
204 
205 int radeon_fbdev_driver_fbdev_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_to_drm(rdev), 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->funcs = &radeon_fbdev_fb_helper_funcs;
247 	fb_helper->fb = fb;
248 
249 	/* okay we have an object now allocate the framebuffer */
250 	info = drm_fb_helper_alloc_info(fb_helper);
251 	if (IS_ERR(info)) {
252 		ret = PTR_ERR(info);
253 		goto err_drm_framebuffer_unregister_private;
254 	}
255 
256 	info->fbops = &radeon_fbdev_fb_ops;
257 
258 	/* radeon resume is fragile and needs a vt switch to help it along */
259 	info->skip_vt_switch = false;
260 
261 	drm_fb_helper_fill_info(info, fb_helper, sizes);
262 
263 	tmp = radeon_bo_gpu_offset(rbo) - rdev->mc.vram_start;
264 	info->fix.smem_start = rdev->mc.aper_base + tmp;
265 	info->fix.smem_len = radeon_bo_size(rbo);
266 	info->screen_base = (__force void __iomem *)rbo->kptr;
267 	info->screen_size = radeon_bo_size(rbo);
268 
269 	memset_io(info->screen_base, 0, info->screen_size);
270 
271 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
272 
273 	DRM_INFO("fb mappable at 0x%lX\n",  info->fix.smem_start);
274 	DRM_INFO("vram apper at 0x%lX\n",  (unsigned long)rdev->mc.aper_base);
275 	DRM_INFO("size %lu\n", (unsigned long)radeon_bo_size(rbo));
276 	DRM_INFO("fb depth is %d\n", fb->format->depth);
277 	DRM_INFO("   pitch is %d\n", fb->pitches[0]);
278 
279 	return 0;
280 
281 err_drm_framebuffer_unregister_private:
282 	fb_helper->fb = NULL;
283 	drm_framebuffer_unregister_private(fb);
284 	drm_framebuffer_cleanup(fb);
285 err_kfree:
286 	kfree(fb);
287 err_radeon_fbdev_destroy_pinned_object:
288 	radeon_fbdev_destroy_pinned_object(gobj);
289 	return ret;
290 }
291 
292 bool radeon_fbdev_robj_is_fb(struct radeon_device *rdev, struct radeon_bo *robj)
293 {
294 	struct drm_fb_helper *fb_helper = rdev_to_drm(rdev)->fb_helper;
295 	struct drm_gem_object *gobj;
296 
297 	if (!fb_helper)
298 		return false;
299 
300 	gobj = drm_gem_fb_get_obj(fb_helper->fb, 0);
301 	if (!gobj)
302 		return false;
303 	if (gobj != &robj->tbo.base)
304 		return false;
305 
306 	return true;
307 }
308