1/*
  2 * Copyright (C) 2013 Red Hat
  3 * Author: Rob Clark <robdclark@gmail.com>
  4 *
  5 * This program is free software; you can redistribute it and/or modify it
  6 * under the terms of the GNU General Public License version 2 as published by
  7 * the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it will be useful, but WITHOUT
 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 12 * more details.
 13 *
 14 * You should have received a copy of the GNU General Public License along with
 15 * this program.  If not, see <http://www.gnu.org/licenses/>.
 16 */
 17
 18#include "msm_drv.h"
 19#include "msm_kms.h"
 20
 21#include "drm_crtc.h"
 22#include "drm_crtc_helper.h"
 23
 24struct msm_framebuffer {
 25	struct drm_framebuffer base;
 26	const struct msm_format *format;
 27	struct drm_gem_object *planes[2];
 28};
 29#define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
 30
 31
 32static int msm_framebuffer_create_handle(struct drm_framebuffer *fb,
 33		struct drm_file *file_priv,
 34		unsigned int *handle)
 35{
 36	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 37	return drm_gem_handle_create(file_priv,
 38			msm_fb->planes[0], handle);
 39}
 40
 41static void msm_framebuffer_destroy(struct drm_framebuffer *fb)
 42{
 43	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 44	int i, n = drm_format_num_planes(fb->pixel_format);
 45
 46	DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);
 47
 48	drm_framebuffer_cleanup(fb);
 49
 50	for (i = 0; i < n; i++) {
 51		struct drm_gem_object *bo = msm_fb->planes[i];
 52		if (bo)
 53			drm_gem_object_unreference_unlocked(bo);
 54	}
 55
 56	kfree(msm_fb);
 57}
 58
 59static int msm_framebuffer_dirty(struct drm_framebuffer *fb,
 60		struct drm_file *file_priv, unsigned flags, unsigned color,
 61		struct drm_clip_rect *clips, unsigned num_clips)
 62{
 63	return 0;
 64}
 65
 66static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
 67	.create_handle = msm_framebuffer_create_handle,
 68	.destroy = msm_framebuffer_destroy,
 69	.dirty = msm_framebuffer_dirty,
 70};
 71
 72#ifdef CONFIG_DEBUG_FS
 73void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 74{
 75	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 76	int i, n = drm_format_num_planes(fb->pixel_format);
 77
 78	seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
 79			fb->width, fb->height, (char *)&fb->pixel_format,
 80			fb->refcount.refcount.counter, fb->base.id);
 81
 82	for (i = 0; i < n; i++) {
 83		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 84				i, fb->offsets[i], fb->pitches[i]);
 85		msm_gem_describe(msm_fb->planes[i], m);
 86	}
 87}
 88#endif
 89
 90struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
 91{
 92	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 93	return msm_fb->planes[plane];
 94}
 95
 96const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 97{
 98	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 99	return msm_fb->format;
100}
101
102struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
103		struct drm_file *file, struct drm_mode_fb_cmd2 *mode_cmd)
104{
105	struct drm_gem_object *bos[4] = {0};
106	struct drm_framebuffer *fb;
107	int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
108
109	for (i = 0; i < n; i++) {
110		bos[i] = drm_gem_object_lookup(dev, file,
111				mode_cmd->handles[i]);
112		if (!bos[i]) {
113			ret = -ENXIO;
114			goto out_unref;
115		}
116	}
117
118	fb = msm_framebuffer_init(dev, mode_cmd, bos);
119	if (IS_ERR(fb)) {
120		ret = PTR_ERR(fb);
121		goto out_unref;
122	}
123
124	return fb;
125
126out_unref:
127	for (i = 0; i < n; i++)
128		drm_gem_object_unreference_unlocked(bos[i]);
129	return ERR_PTR(ret);
130}
131
132struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
133		struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
134{
135	struct msm_drm_private *priv = dev->dev_private;
136	struct msm_kms *kms = priv->kms;
137	struct msm_framebuffer *msm_fb;
138	struct drm_framebuffer *fb = NULL;
139	const struct msm_format *format;
140	int ret, i, n;
141	unsigned int hsub, vsub;
142
143	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
144			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
145			(char *)&mode_cmd->pixel_format);
146
147	n = drm_format_num_planes(mode_cmd->pixel_format);
148	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
149	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
150
151	format = kms->funcs->get_format(kms, mode_cmd->pixel_format);
152	if (!format) {
153		dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
154				(char *)&mode_cmd->pixel_format);
155		ret = -EINVAL;
156		goto fail;
157	}
158
159	msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
160	if (!msm_fb) {
161		ret = -ENOMEM;
162		goto fail;
163	}
164
165	fb = &msm_fb->base;
166
167	msm_fb->format = format;
168
169	for (i = 0; i < n; i++) {
170		unsigned int width = mode_cmd->width / (i ? hsub : 1);
171		unsigned int height = mode_cmd->height / (i ? vsub : 1);
172		unsigned int min_size;
173
174		min_size = (height - 1) * mode_cmd->pitches[i]
175			 + width * drm_format_plane_cpp(mode_cmd->pixel_format, 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->planes[i] = bos[i];
184	}
185
186	drm_helper_mode_fill_fb_struct(fb, mode_cmd);
187
188	ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
189	if (ret) {
190		dev_err(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
198fail:
199	if (fb)
200		msm_framebuffer_destroy(fb);
201
202	return ERR_PTR(ret);
203}