drivers/gpu/drm/msm/msm_fb.c

   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
  20 #include "drm_crtc.h"
  21 #include "drm_crtc_helper.h"
  22
  23 struct msm_framebuffer {
  24         struct drm_framebuffer base;
  25         const struct msm_format *format;
  26         struct drm_gem_object *planes[2];
  27 };
  28 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
  29
  30
  31 static int msm_framebuffer_create_handle(struct drm_framebuffer *fb,
  32                 struct drm_file *file_priv,
  33                 unsigned int *handle)
  34 {
  35         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  36         return drm_gem_handle_create(file_priv,
  37                         msm_fb->planes[0], handle);
  38 }
  39
  40 static void msm_framebuffer_destroy(struct drm_framebuffer *fb)
  41 {
  42         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  43         int i, n = drm_format_num_planes(fb->pixel_format);
  44
  45         DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);
  46
  47         drm_framebuffer_cleanup(fb);
  48
  49         for (i = 0; i < n; i++) {
  50                 struct drm_gem_object *bo = msm_fb->planes[i];
  51                 if (bo)
  52                         drm_gem_object_unreference_unlocked(bo);
  53         }
  54
  55         kfree(msm_fb);
  56 }
  57
  58 static int msm_framebuffer_dirty(struct drm_framebuffer *fb,
  59                 struct drm_file *file_priv, unsigned flags, unsigned color,
  60                 struct drm_clip_rect *clips, unsigned num_clips)
  61 {
  62         return 0;
  63 }
  64
  65 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
  66         .create_handle = msm_framebuffer_create_handle,
  67         .destroy = msm_framebuffer_destroy,
  68         .dirty = msm_framebuffer_dirty,
  69 };
  70
  71 #ifdef CONFIG_DEBUG_FS
  72 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
  73 {
  74         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  75         int i, n = drm_format_num_planes(fb->pixel_format);
  76
  77         seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
  78                         fb->width, fb->height, (char *)&fb->pixel_format,
  79                         fb->refcount.refcount.counter, fb->base.id);
  80
  81         for (i = 0; i < n; i++) {
  82                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
  83                                 i, fb->offsets[i], fb->pitches[i]);
  84                 msm_gem_describe(msm_fb->planes[i], m);
  85         }
  86 }
  87 #endif
  88
  89 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
  90 {
  91         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  92         return msm_fb->planes[plane];
  93 }
  94
  95 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
  96 {
  97         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  98         return msm_fb->format;
  99 }
 100
 101 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 102                 struct drm_file *file, struct drm_mode_fb_cmd2 *mode_cmd)
 103 {
 104         struct drm_gem_object *bos[4] = {0};
 105         struct drm_framebuffer *fb;
 106         int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
 107
 108         for (i = 0; i < n; i++) {
 109                 bos[i] = drm_gem_object_lookup(dev, file,
 110                                 mode_cmd->handles[i]);
 111                 if (!bos[i]) {
 112                         ret = -ENXIO;
 113                         goto out_unref;
 114                 }
 115         }
 116
 117         fb = msm_framebuffer_init(dev, mode_cmd, bos);
 118         if (IS_ERR(fb)) {
 119                 ret = PTR_ERR(fb);
 120                 goto out_unref;
 121         }
 122
 123         return fb;
 124
 125 out_unref:
 126         for (i = 0; i < n; i++)
 127                 drm_gem_object_unreference_unlocked(bos[i]);
 128         return ERR_PTR(ret);
 129 }
 130
 131 struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 132                 struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 133 {
 134         struct msm_drm_private *priv = dev->dev_private;
 135         struct msm_kms *kms = priv->kms;
 136         struct msm_framebuffer *msm_fb;
 137         struct drm_framebuffer *fb = NULL;
 138         const struct msm_format *format;
 139         int ret, i, n;
 140         unsigned int hsub, vsub;
 141
 142         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 143                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 144                         (char *)&mode_cmd->pixel_format);
 145
 146         n = drm_format_num_planes(mode_cmd->pixel_format);
 147         hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 148         vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
 149
 150         format = kms->funcs->get_format(kms, mode_cmd->pixel_format);
 151         if (!format) {
 152                 dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
 153                                 (char *)&mode_cmd->pixel_format);
 154                 ret = -EINVAL;
 155                 goto fail;
 156         }
 157
 158         msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 159         if (!msm_fb) {
 160                 ret = -ENOMEM;
 161                 goto fail;
 162         }
 163
 164         fb = &msm_fb->base;
 165
 166         msm_fb->format = format;
 167
 168         for (i = 0; i < n; i++) {
 169                 unsigned int width = mode_cmd->width / (i ? hsub : 1);
 170                 unsigned int height = mode_cmd->height / (i ? vsub : 1);
 171                 unsigned int min_size;
 172
 173                 min_size = (height - 1) * mode_cmd->pitches[i]
 174                          + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
 175                          + mode_cmd->offsets[i];
 176
 177                 if (bos[i]->size < min_size) {
 178                         ret = -EINVAL;
 179                         goto fail;
 180                 }
 181
 182                 msm_fb->planes[i] = bos[i];
 183         }
 184
 185         drm_helper_mode_fill_fb_struct(fb, mode_cmd);
 186
 187         ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 188         if (ret) {
 189                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 190                 goto fail;
 191         }
 192
 193         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 194
 195         return fb;
 196
 197 fail:
 198         if (fb)
 199                 msm_framebuffer_destroy(fb);
 200
 201         return ERR_PTR(ret);
 202 }