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[MAX_PLANE];
 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
 90/* prepare/pin all the fb's bo's for scanout.  Note that it is not valid
 91 * to prepare an fb more multiple different initiator 'id's.  But that
 92 * should be fine, since only the scanout (mdpN) side of things needs
 93 * this, the gpu doesn't care about fb's.
 94 */
 95int msm_framebuffer_prepare(struct drm_framebuffer *fb, int id)
 96{
 97	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 98	int ret, i, n = drm_format_num_planes(fb->pixel_format);
 99	uint32_t iova;
100
101	for (i = 0; i < n; i++) {
102		ret = msm_gem_get_iova(msm_fb->planes[i], id, &iova);
103		DBG("FB[%u]: iova[%d]: %08x (%d)", fb->base.id, i, iova, ret);
104		if (ret)
105			return ret;
106	}
107
108	return 0;
109}
110
111void msm_framebuffer_cleanup(struct drm_framebuffer *fb, int id)
112{
113	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
114	int i, n = drm_format_num_planes(fb->pixel_format);
115
116	for (i = 0; i < n; i++)
117		msm_gem_put_iova(msm_fb->planes[i], id);
118}
119
120uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb, int id, int plane)
121{
122	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
123	if (!msm_fb->planes[plane])
124		return 0;
125	return msm_gem_iova(msm_fb->planes[plane], id) + fb->offsets[plane];
126}
127
128struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
129{
130	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
131	return msm_fb->planes[plane];
132}
133
134const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
135{
136	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
137	return msm_fb->format;
138}
139
140struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
141		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
142{
143	struct drm_gem_object *bos[4] = {0};
144	struct drm_framebuffer *fb;
145	int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
146
147	for (i = 0; i < n; i++) {
148		bos[i] = drm_gem_object_lookup(dev, file,
149				mode_cmd->handles[i]);
150		if (!bos[i]) {
151			ret = -ENXIO;
152			goto out_unref;
153		}
154	}
155
156	fb = msm_framebuffer_init(dev, mode_cmd, bos);
157	if (IS_ERR(fb)) {
158		ret = PTR_ERR(fb);
159		goto out_unref;
160	}
161
162	return fb;
163
164out_unref:
165	for (i = 0; i < n; i++)
166		drm_gem_object_unreference_unlocked(bos[i]);
167	return ERR_PTR(ret);
168}
169
170struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
171		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
172{
173	struct msm_drm_private *priv = dev->dev_private;
174	struct msm_kms *kms = priv->kms;
175	struct msm_framebuffer *msm_fb = NULL;
176	struct drm_framebuffer *fb;
177	const struct msm_format *format;
178	int ret, i, n;
179	unsigned int hsub, vsub;
180
181	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
182			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
183			(char *)&mode_cmd->pixel_format);
184
185	n = drm_format_num_planes(mode_cmd->pixel_format);
186	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
187	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
188
189	format = kms->funcs->get_format(kms, mode_cmd->pixel_format);
190	if (!format) {
191		dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
192				(char *)&mode_cmd->pixel_format);
193		ret = -EINVAL;
194		goto fail;
195	}
196
197	msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
198	if (!msm_fb) {
199		ret = -ENOMEM;
200		goto fail;
201	}
202
203	fb = &msm_fb->base;
204
205	msm_fb->format = format;
206
207	if (n > ARRAY_SIZE(msm_fb->planes)) {
208		ret = -EINVAL;
209		goto fail;
210	}
211
212	for (i = 0; i < n; i++) {
213		unsigned int width = mode_cmd->width / (i ? hsub : 1);
214		unsigned int height = mode_cmd->height / (i ? vsub : 1);
215		unsigned int min_size;
216
217		min_size = (height - 1) * mode_cmd->pitches[i]
218			 + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
219			 + mode_cmd->offsets[i];
220
221		if (bos[i]->size < min_size) {
222			ret = -EINVAL;
223			goto fail;
224		}
225
226		msm_fb->planes[i] = bos[i];
227	}
228
229	drm_helper_mode_fill_fb_struct(fb, mode_cmd);
230
231	ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
232	if (ret) {
233		dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
234		goto fail;
235	}
236
237	DBG("create: FB ID: %d (%p)", fb->base.id, fb);
238
239	return fb;
240
241fail:
242	kfree(msm_fb);
243
244	return ERR_PTR(ret);
245}