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
  53                 drm_gem_object_unreference_unlocked(bo);
  54         }
  55
  56         kfree(msm_fb);
  57 }
  58
  59 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
  60         .create_handle = msm_framebuffer_create_handle,
  61         .destroy = msm_framebuffer_destroy,
  62 };
  63
  64 #ifdef CONFIG_DEBUG_FS
  65 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
  66 {
  67         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  68         int i, n = drm_format_num_planes(fb->pixel_format);
  69
  70         seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
  71                         fb->width, fb->height, (char *)&fb->pixel_format,
  72                         drm_framebuffer_read_refcount(fb), fb->base.id);
  73
  74         for (i = 0; i < n; i++) {
  75                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
  76                                 i, fb->offsets[i], fb->pitches[i]);
  77                 msm_gem_describe(msm_fb->planes[i], m);
  78         }
  79 }
  80 #endif
  81
  82 /* prepare/pin all the fb's bo's for scanout.  Note that it is not valid
  83  * to prepare an fb more multiple different initiator 'id's.  But that
  84  * should be fine, since only the scanout (mdpN) side of things needs
  85  * this, the gpu doesn't care about fb's.
  86  */
  87 int msm_framebuffer_prepare(struct drm_framebuffer *fb, int id)
  88 {
  89         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  90         int ret, i, n = drm_format_num_planes(fb->pixel_format);
  91         uint32_t iova;
  92
  93         for (i = 0; i < n; i++) {
  94                 ret = msm_gem_get_iova(msm_fb->planes[i], id, &iova);
  95                 DBG("FB[%u]: iova[%d]: %08x (%d)", fb->base.id, i, iova, ret);
  96                 if (ret)
  97                         return ret;
  98         }
  99
 100         return 0;
 101 }
 102
 103 void msm_framebuffer_cleanup(struct drm_framebuffer *fb, int id)
 104 {
 105         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 106         int i, n = drm_format_num_planes(fb->pixel_format);
 107
 108         for (i = 0; i < n; i++)
 109                 msm_gem_put_iova(msm_fb->planes[i], id);
 110 }
 111
 112 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb, int id, int plane)
 113 {
 114         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 115         if (!msm_fb->planes[plane])
 116                 return 0;
 117         return msm_gem_iova(msm_fb->planes[plane], id) + fb->offsets[plane];
 118 }
 119
 120 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
 121 {
 122         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 123         return msm_fb->planes[plane];
 124 }
 125
 126 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 127 {
 128         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 129         return msm_fb->format;
 130 }
 131
 132 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 133                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 134 {
 135         struct drm_gem_object *bos[4] = {0};
 136         struct drm_framebuffer *fb;
 137         int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
 138
 139         for (i = 0; i < n; i++) {
 140                 bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 141                 if (!bos[i]) {
 142                         ret = -ENXIO;
 143                         goto out_unref;
 144                 }
 145         }
 146
 147         fb = msm_framebuffer_init(dev, mode_cmd, bos);
 148         if (IS_ERR(fb)) {
 149                 ret = PTR_ERR(fb);
 150                 goto out_unref;
 151         }
 152
 153         return fb;
 154
 155 out_unref:
 156         for (i = 0; i < n; i++)
 157                 drm_gem_object_unreference_unlocked(bos[i]);
 158         return ERR_PTR(ret);
 159 }
 160
 161 struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 162                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 163 {
 164         struct msm_drm_private *priv = dev->dev_private;
 165         struct msm_kms *kms = priv->kms;
 166         struct msm_framebuffer *msm_fb = NULL;
 167         struct drm_framebuffer *fb;
 168         const struct msm_format *format;
 169         int ret, i, n;
 170         unsigned int hsub, vsub;
 171
 172         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 173                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 174                         (char *)&mode_cmd->pixel_format);
 175
 176         n = drm_format_num_planes(mode_cmd->pixel_format);
 177         hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 178         vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
 179
 180         format = kms->funcs->get_format(kms, mode_cmd->pixel_format);
 181         if (!format) {
 182                 dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
 183                                 (char *)&mode_cmd->pixel_format);
 184                 ret = -EINVAL;
 185                 goto fail;
 186         }
 187
 188         msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 189         if (!msm_fb) {
 190                 ret = -ENOMEM;
 191                 goto fail;
 192         }
 193
 194         fb = &msm_fb->base;
 195
 196         msm_fb->format = format;
 197
 198         if (n > ARRAY_SIZE(msm_fb->planes)) {
 199                 ret = -EINVAL;
 200                 goto fail;
 201         }
 202
 203         for (i = 0; i < n; i++) {
 204                 unsigned int width = mode_cmd->width / (i ? hsub : 1);
 205                 unsigned int height = mode_cmd->height / (i ? vsub : 1);
 206                 unsigned int min_size;
 207
 208                 min_size = (height - 1) * mode_cmd->pitches[i]
 209                          + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
 210                          + mode_cmd->offsets[i];
 211
 212                 if (bos[i]->size < min_size) {
 213                         ret = -EINVAL;
 214                         goto fail;
 215                 }
 216
 217                 msm_fb->planes[i] = bos[i];
 218         }
 219
 220         drm_helper_mode_fill_fb_struct(fb, mode_cmd);
 221
 222         ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 223         if (ret) {
 224                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 225                 goto fail;
 226         }
 227
 228         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 229
 230         return fb;
 231
 232 fail:
 233         kfree(msm_fb);
 234
 235         return ERR_PTR(ret);
 236 }