xref: /openbmc/linux/drivers/gpu/drm/msm/msm_fb.c (revision 9726bfcd)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2013 Red Hat
4  * Author: Rob Clark <robdclark@gmail.com>
5  */
6 
7 #include <drm/drm_crtc.h>
8 #include <drm/drm_damage_helper.h>
9 #include <drm/drm_gem_framebuffer_helper.h>
10 #include <drm/drm_probe_helper.h>
11 
12 #include "msm_drv.h"
13 #include "msm_kms.h"
14 #include "msm_gem.h"
15 
16 struct msm_framebuffer {
17 	struct drm_framebuffer base;
18 	const struct msm_format *format;
19 };
20 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
21 
22 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
23 		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos);
24 
25 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
26 	.create_handle = drm_gem_fb_create_handle,
27 	.destroy = drm_gem_fb_destroy,
28 	.dirty = drm_atomic_helper_dirtyfb,
29 };
30 
31 #ifdef CONFIG_DEBUG_FS
32 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
33 {
34 	int i, n = fb->format->num_planes;
35 
36 	seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
37 			fb->width, fb->height, (char *)&fb->format->format,
38 			drm_framebuffer_read_refcount(fb), fb->base.id);
39 
40 	for (i = 0; i < n; i++) {
41 		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
42 				i, fb->offsets[i], fb->pitches[i]);
43 		msm_gem_describe(fb->obj[i], m);
44 	}
45 }
46 #endif
47 
48 /* prepare/pin all the fb's bo's for scanout.  Note that it is not valid
49  * to prepare an fb more multiple different initiator 'id's.  But that
50  * should be fine, since only the scanout (mdpN) side of things needs
51  * this, the gpu doesn't care about fb's.
52  */
53 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
54 		struct msm_gem_address_space *aspace)
55 {
56 	int ret, i, n = fb->format->num_planes;
57 	uint64_t iova;
58 
59 	for (i = 0; i < n; i++) {
60 		ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &iova);
61 		DBG("FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
62 		if (ret)
63 			return ret;
64 	}
65 
66 	return 0;
67 }
68 
69 void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
70 		struct msm_gem_address_space *aspace)
71 {
72 	int i, n = fb->format->num_planes;
73 
74 	for (i = 0; i < n; i++)
75 		msm_gem_unpin_iova(fb->obj[i], aspace);
76 }
77 
78 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
79 		struct msm_gem_address_space *aspace, int plane)
80 {
81 	if (!fb->obj[plane])
82 		return 0;
83 	return msm_gem_iova(fb->obj[plane], aspace) + fb->offsets[plane];
84 }
85 
86 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
87 {
88 	return drm_gem_fb_get_obj(fb, plane);
89 }
90 
91 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
92 {
93 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
94 	return msm_fb->format;
95 }
96 
97 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
98 		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
99 {
100 	const struct drm_format_info *info = drm_get_format_info(dev,
101 								 mode_cmd);
102 	struct drm_gem_object *bos[4] = {0};
103 	struct drm_framebuffer *fb;
104 	int ret, i, n = info->num_planes;
105 
106 	for (i = 0; i < n; i++) {
107 		bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
108 		if (!bos[i]) {
109 			ret = -ENXIO;
110 			goto out_unref;
111 		}
112 	}
113 
114 	fb = msm_framebuffer_init(dev, mode_cmd, bos);
115 	if (IS_ERR(fb)) {
116 		ret = PTR_ERR(fb);
117 		goto out_unref;
118 	}
119 
120 	return fb;
121 
122 out_unref:
123 	for (i = 0; i < n; i++)
124 		drm_gem_object_put_unlocked(bos[i]);
125 	return ERR_PTR(ret);
126 }
127 
128 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
129 		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
130 {
131 	const struct drm_format_info *info = drm_get_format_info(dev,
132 								 mode_cmd);
133 	struct msm_drm_private *priv = dev->dev_private;
134 	struct msm_kms *kms = priv->kms;
135 	struct msm_framebuffer *msm_fb = NULL;
136 	struct drm_framebuffer *fb;
137 	const struct msm_format *format;
138 	int ret, i, n;
139 
140 	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
141 			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
142 			(char *)&mode_cmd->pixel_format);
143 
144 	n = info->num_planes;
145 	format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
146 			mode_cmd->modifier[0]);
147 	if (!format) {
148 		DRM_DEV_ERROR(dev->dev, "unsupported pixel format: %4.4s\n",
149 				(char *)&mode_cmd->pixel_format);
150 		ret = -EINVAL;
151 		goto fail;
152 	}
153 
154 	msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
155 	if (!msm_fb) {
156 		ret = -ENOMEM;
157 		goto fail;
158 	}
159 
160 	fb = &msm_fb->base;
161 
162 	msm_fb->format = format;
163 
164 	if (n > ARRAY_SIZE(fb->obj)) {
165 		ret = -EINVAL;
166 		goto fail;
167 	}
168 
169 	for (i = 0; i < n; i++) {
170 		unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
171 		unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
172 		unsigned int min_size;
173 
174 		min_size = (height - 1) * mode_cmd->pitches[i]
175 			 + width * info->cpp[i]
176 			 + mode_cmd->offsets[i];
177 
178 		if (bos[i]->size < min_size) {
179 			ret = -EINVAL;
180 			goto fail;
181 		}
182 
183 		msm_fb->base.obj[i] = bos[i];
184 	}
185 
186 	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
187 
188 	ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
189 	if (ret) {
190 		DRM_DEV_ERROR(dev->dev, "framebuffer init failed: %d\n", ret);
191 		goto fail;
192 	}
193 
194 	DBG("create: FB ID: %d (%p)", fb->base.id, fb);
195 
196 	return fb;
197 
198 fail:
199 	kfree(msm_fb);
200 
201 	return ERR_PTR(ret);
202 }
203 
204 struct drm_framebuffer *
205 msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
206 {
207 	struct drm_mode_fb_cmd2 mode_cmd = {
208 		.pixel_format = format,
209 		.width = w,
210 		.height = h,
211 		.pitches = { p },
212 	};
213 	struct drm_gem_object *bo;
214 	struct drm_framebuffer *fb;
215 	int size;
216 
217 	/* allocate backing bo */
218 	size = mode_cmd.pitches[0] * mode_cmd.height;
219 	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
220 	bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
221 	if (IS_ERR(bo)) {
222 		dev_warn(dev->dev, "could not allocate stolen bo\n");
223 		/* try regular bo: */
224 		bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
225 	}
226 	if (IS_ERR(bo)) {
227 		DRM_DEV_ERROR(dev->dev, "failed to allocate buffer object\n");
228 		return ERR_CAST(bo);
229 	}
230 
231 	msm_gem_object_set_name(bo, "stolenfb");
232 
233 	fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
234 	if (IS_ERR(fb)) {
235 		DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
236 		/* note: if fb creation failed, we can't rely on fb destroy
237 		 * to unref the bo:
238 		 */
239 		drm_gem_object_put_unlocked(bo);
240 		return ERR_CAST(fb);
241 	}
242 
243 	return fb;
244 }
245