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 #include "msm_kms.h"
  20
  21 #include "drm_crtc.h"
  22 #include "drm_crtc_helper.h"
  23
  24 struct 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
  32 static 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
  41 static 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
  59 static 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
  66 static 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
  73 void 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  */
  95 int 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
 111 void 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
 120 uint32_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
 128 struct 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
 134 const 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
 140 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 141                 struct drm_file *file, 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
 164 out_unref:
 165         for (i = 0; i < n; i++)
 166                 drm_gem_object_unreference_unlocked(bos[i]);
 167         return ERR_PTR(ret);
 168 }
 169
 170 struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 171                 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
 241 fail:
 242         kfree(msm_fb);
 243
 244         return ERR_PTR(ret);
 245 }