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 <drm/drm_crtc.h>
  19 #include <drm/drm_crtc_helper.h>
  20
  21 #include "msm_drv.h"
  22 #include "msm_kms.h"
  23 #include "msm_gem.h"
  24
  25 struct msm_framebuffer {
  26         struct drm_framebuffer base;
  27         const struct msm_format *format;
  28         struct drm_gem_object *planes[MAX_PLANE];
  29 };
  30 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
  31
  32 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
  33                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos);
  34
  35 static int msm_framebuffer_create_handle(struct drm_framebuffer *fb,
  36                 struct drm_file *file_priv,
  37                 unsigned int *handle)
  38 {
  39         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  40         return drm_gem_handle_create(file_priv,
  41                         msm_fb->planes[0], handle);
  42 }
  43
  44 static void msm_framebuffer_destroy(struct drm_framebuffer *fb)
  45 {
  46         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  47         int i, n = fb->format->num_planes;
  48
  49         DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);
  50
  51         drm_framebuffer_cleanup(fb);
  52
  53         for (i = 0; i < n; i++) {
  54                 struct drm_gem_object *bo = msm_fb->planes[i];
  55
  56                 drm_gem_object_unreference_unlocked(bo);
  57         }
  58
  59         kfree(msm_fb);
  60 }
  61
  62 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
  63         .create_handle = msm_framebuffer_create_handle,
  64         .destroy = msm_framebuffer_destroy,
  65 };
  66
  67 #ifdef CONFIG_DEBUG_FS
  68 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
  69 {
  70         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  71         int i, n = fb->format->num_planes;
  72
  73         seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
  74                         fb->width, fb->height, (char *)&fb->format->format,
  75                         drm_framebuffer_read_refcount(fb), fb->base.id);
  76
  77         for (i = 0; i < n; i++) {
  78                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
  79                                 i, fb->offsets[i], fb->pitches[i]);
  80                 msm_gem_describe(msm_fb->planes[i], m);
  81         }
  82 }
  83 #endif
  84
  85 /* prepare/pin all the fb's bo's for scanout.  Note that it is not valid
  86  * to prepare an fb more multiple different initiator 'id's.  But that
  87  * should be fine, since only the scanout (mdpN) side of things needs
  88  * this, the gpu doesn't care about fb's.
  89  */
  90 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
  91                 struct msm_gem_address_space *aspace)
  92 {
  93         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  94         int ret, i, n = fb->format->num_planes;
  95         uint64_t iova;
  96
  97         for (i = 0; i < n; i++) {
  98                 ret = msm_gem_get_iova(msm_fb->planes[i], aspace, &iova);
  99                 DBG("FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
 100                 if (ret)
 101                         return ret;
 102         }
 103
 104         return 0;
 105 }
 106
 107 void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
 108                 struct msm_gem_address_space *aspace)
 109 {
 110         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 111         int i, n = fb->format->num_planes;
 112
 113         for (i = 0; i < n; i++)
 114                 msm_gem_put_iova(msm_fb->planes[i], aspace);
 115 }
 116
 117 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
 118                 struct msm_gem_address_space *aspace, int plane)
 119 {
 120         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 121         if (!msm_fb->planes[plane])
 122                 return 0;
 123         return msm_gem_iova(msm_fb->planes[plane], aspace) + fb->offsets[plane];
 124 }
 125
 126 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
 127 {
 128         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 129         return msm_fb->planes[plane];
 130 }
 131
 132 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 133 {
 134         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 135         return msm_fb->format;
 136 }
 137
 138 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 139                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 140 {
 141         struct drm_gem_object *bos[4] = {0};
 142         struct drm_framebuffer *fb;
 143         int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
 144
 145         for (i = 0; i < n; i++) {
 146                 bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 147                 if (!bos[i]) {
 148                         ret = -ENXIO;
 149                         goto out_unref;
 150                 }
 151         }
 152
 153         fb = msm_framebuffer_init(dev, mode_cmd, bos);
 154         if (IS_ERR(fb)) {
 155                 ret = PTR_ERR(fb);
 156                 goto out_unref;
 157         }
 158
 159         return fb;
 160
 161 out_unref:
 162         for (i = 0; i < n; i++)
 163                 drm_gem_object_unreference_unlocked(bos[i]);
 164         return ERR_PTR(ret);
 165 }
 166
 167 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 168                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 169 {
 170         struct msm_drm_private *priv = dev->dev_private;
 171         struct msm_kms *kms = priv->kms;
 172         struct msm_framebuffer *msm_fb = NULL;
 173         struct drm_framebuffer *fb;
 174         const struct msm_format *format;
 175         int ret, i, n;
 176         unsigned int hsub, vsub;
 177
 178         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 179                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 180                         (char *)&mode_cmd->pixel_format);
 181
 182         n = drm_format_num_planes(mode_cmd->pixel_format);
 183         hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 184         vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
 185
 186         format = kms->funcs->get_format(kms, mode_cmd->pixel_format);
 187         if (!format) {
 188                 dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
 189                                 (char *)&mode_cmd->pixel_format);
 190                 ret = -EINVAL;
 191                 goto fail;
 192         }
 193
 194         msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 195         if (!msm_fb) {
 196                 ret = -ENOMEM;
 197                 goto fail;
 198         }
 199
 200         fb = &msm_fb->base;
 201
 202         msm_fb->format = format;
 203
 204         if (n > ARRAY_SIZE(msm_fb->planes)) {
 205                 ret = -EINVAL;
 206                 goto fail;
 207         }
 208
 209         for (i = 0; i < n; i++) {
 210                 unsigned int width = mode_cmd->width / (i ? hsub : 1);
 211                 unsigned int height = mode_cmd->height / (i ? vsub : 1);
 212                 unsigned int min_size;
 213
 214                 min_size = (height - 1) * mode_cmd->pitches[i]
 215                          + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
 216                          + mode_cmd->offsets[i];
 217
 218                 if (bos[i]->size < min_size) {
 219                         ret = -EINVAL;
 220                         goto fail;
 221                 }
 222
 223                 msm_fb->planes[i] = bos[i];
 224         }
 225
 226         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 227
 228         ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 229         if (ret) {
 230                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 231                 goto fail;
 232         }
 233
 234         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 235
 236         return fb;
 237
 238 fail:
 239         kfree(msm_fb);
 240
 241         return ERR_PTR(ret);
 242 }
 243
 244 struct drm_framebuffer *
 245 msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
 246 {
 247         struct drm_mode_fb_cmd2 mode_cmd = {
 248                 .pixel_format = format,
 249                 .width = w,
 250                 .height = h,
 251                 .pitches = { p },
 252         };
 253         struct drm_gem_object *bo;
 254         struct drm_framebuffer *fb;
 255         int size;
 256
 257         /* allocate backing bo */
 258         size = mode_cmd.pitches[0] * mode_cmd.height;
 259         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 260         bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
 261         if (IS_ERR(bo)) {
 262                 dev_warn(dev->dev, "could not allocate stolen bo\n");
 263                 /* try regular bo: */
 264                 bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
 265         }
 266         if (IS_ERR(bo)) {
 267                 dev_err(dev->dev, "failed to allocate buffer object\n");
 268                 return ERR_CAST(bo);
 269         }
 270
 271         fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
 272         if (IS_ERR(fb)) {
 273                 dev_err(dev->dev, "failed to allocate fb\n");
 274                 /* note: if fb creation failed, we can't rely on fb destroy
 275                  * to unref the bo:
 276                  */
 277                 drm_gem_object_unreference_unlocked(bo);
 278                 return ERR_CAST(fb);
 279         }
 280
 281         return fb;
 282 }