drivers/gpu/drm/msm/msm_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include <drm/drm_crtc.h>
   8 #include <drm/drm_damage_helper.h>
   9 #include <drm/drm_file.h>
  10 #include <drm/drm_fourcc.h>
  11 #include <drm/drm_gem_framebuffer_helper.h>
  12 #include <drm/drm_probe_helper.h>
  13
  14 #include "msm_drv.h"
  15 #include "msm_kms.h"
  16 #include "msm_gem.h"
  17
  18 struct msm_framebuffer {
  19         struct drm_framebuffer base;
  20         const struct msm_format *format;
  21
  22         /* Count of # of attached planes which need dirtyfb: */
  23         refcount_t dirtyfb;
  24 };
  25 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
  26
  27 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
  28                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos);
  29
  30 static int msm_framebuffer_dirtyfb(struct drm_framebuffer *fb,
  31                                    struct drm_file *file_priv, unsigned int flags,
  32                                    unsigned int color, struct drm_clip_rect *clips,
  33                                    unsigned int num_clips)
  34 {
  35         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  36
  37         /* If this fb is not used on any display requiring pixel data to be
  38          * flushed, then skip dirtyfb
  39          */
  40         if (refcount_read(&msm_fb->dirtyfb) == 1)
  41                 return 0;
  42
  43         return drm_atomic_helper_dirtyfb(fb, file_priv, flags, color,
  44                                          clips, num_clips);
  45 }
  46
  47 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
  48         .create_handle = drm_gem_fb_create_handle,
  49         .destroy = drm_gem_fb_destroy,
  50         .dirty = msm_framebuffer_dirtyfb,
  51 };
  52
  53 #ifdef CONFIG_DEBUG_FS
  54 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
  55 {
  56         struct msm_gem_stats stats = {};
  57         int i, n = fb->format->num_planes;
  58
  59         seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
  60                         fb->width, fb->height, (char *)&fb->format->format,
  61                         drm_framebuffer_read_refcount(fb), fb->base.id);
  62
  63         for (i = 0; i < n; i++) {
  64                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
  65                                 i, fb->offsets[i], fb->pitches[i]);
  66                 msm_gem_describe(fb->obj[i], m, &stats);
  67         }
  68 }
  69 #endif
  70
  71 /* prepare/pin all the fb's bo's for scanout.
  72  */
  73 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
  74                 struct msm_gem_address_space *aspace,
  75                 bool needs_dirtyfb)
  76 {
  77         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  78         int ret, i, n = fb->format->num_planes;
  79         uint64_t iova;
  80
  81         if (needs_dirtyfb)
  82                 refcount_inc(&msm_fb->dirtyfb);
  83
  84         for (i = 0; i < n; i++) {
  85                 ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &iova);
  86                 drm_dbg_state(fb->dev, "FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
  87                 if (ret)
  88                         return ret;
  89         }
  90
  91         return 0;
  92 }
  93
  94 void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
  95                 struct msm_gem_address_space *aspace,
  96                 bool needed_dirtyfb)
  97 {
  98         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  99         int i, n = fb->format->num_planes;
 100
 101         if (needed_dirtyfb)
 102                 refcount_dec(&msm_fb->dirtyfb);
 103
 104         for (i = 0; i < n; i++)
 105                 msm_gem_unpin_iova(fb->obj[i], aspace);
 106 }
 107
 108 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
 109                 struct msm_gem_address_space *aspace, int plane)
 110 {
 111         if (!fb->obj[plane])
 112                 return 0;
 113         return msm_gem_iova(fb->obj[plane], aspace) + fb->offsets[plane];
 114 }
 115
 116 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
 117 {
 118         return drm_gem_fb_get_obj(fb, plane);
 119 }
 120
 121 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 122 {
 123         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 124         return msm_fb->format;
 125 }
 126
 127 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 128                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 129 {
 130         const struct drm_format_info *info = drm_get_format_info(dev,
 131                                                                  mode_cmd);
 132         struct drm_gem_object *bos[4] = {0};
 133         struct drm_framebuffer *fb;
 134         int ret, i, n = info->num_planes;
 135
 136         for (i = 0; i < n; i++) {
 137                 bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 138                 if (!bos[i]) {
 139                         ret = -ENXIO;
 140                         goto out_unref;
 141                 }
 142         }
 143
 144         fb = msm_framebuffer_init(dev, mode_cmd, bos);
 145         if (IS_ERR(fb)) {
 146                 ret = PTR_ERR(fb);
 147                 goto out_unref;
 148         }
 149
 150         return fb;
 151
 152 out_unref:
 153         for (i = 0; i < n; i++)
 154                 drm_gem_object_put(bos[i]);
 155         return ERR_PTR(ret);
 156 }
 157
 158 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 159                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 160 {
 161         const struct drm_format_info *info = drm_get_format_info(dev,
 162                                                                  mode_cmd);
 163         struct msm_drm_private *priv = dev->dev_private;
 164         struct msm_kms *kms = priv->kms;
 165         struct msm_framebuffer *msm_fb = NULL;
 166         struct drm_framebuffer *fb;
 167         const struct msm_format *format;
 168         int ret, i, n;
 169
 170         drm_dbg_state(dev, "create framebuffer: mode_cmd=%p (%dx%d@%4.4s)",
 171                         mode_cmd, mode_cmd->width, mode_cmd->height,
 172                         (char *)&mode_cmd->pixel_format);
 173
 174         n = info->num_planes;
 175         format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
 176                         mode_cmd->modifier[0]);
 177         if (!format) {
 178                 DRM_DEV_ERROR(dev->dev, "unsupported pixel format: %4.4s\n",
 179                                 (char *)&mode_cmd->pixel_format);
 180                 ret = -EINVAL;
 181                 goto fail;
 182         }
 183
 184         msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 185         if (!msm_fb) {
 186                 ret = -ENOMEM;
 187                 goto fail;
 188         }
 189
 190         fb = &msm_fb->base;
 191
 192         msm_fb->format = format;
 193
 194         if (n > ARRAY_SIZE(fb->obj)) {
 195                 ret = -EINVAL;
 196                 goto fail;
 197         }
 198
 199         for (i = 0; i < n; i++) {
 200                 unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
 201                 unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
 202                 unsigned int min_size;
 203
 204                 min_size = (height - 1) * mode_cmd->pitches[i]
 205                          + width * info->cpp[i]
 206                          + mode_cmd->offsets[i];
 207
 208                 if (bos[i]->size < min_size) {
 209                         ret = -EINVAL;
 210                         goto fail;
 211                 }
 212
 213                 msm_fb->base.obj[i] = bos[i];
 214         }
 215
 216         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 217
 218         ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 219         if (ret) {
 220                 DRM_DEV_ERROR(dev->dev, "framebuffer init failed: %d\n", ret);
 221                 goto fail;
 222         }
 223
 224         refcount_set(&msm_fb->dirtyfb, 1);
 225
 226         drm_dbg_state(dev, "create: FB ID: %d (%p)", fb->base.id, fb);
 227
 228         return fb;
 229
 230 fail:
 231         kfree(msm_fb);
 232
 233         return ERR_PTR(ret);
 234 }
 235
 236 struct drm_framebuffer *
 237 msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
 238 {
 239         struct drm_mode_fb_cmd2 mode_cmd = {
 240                 .pixel_format = format,
 241                 .width = w,
 242                 .height = h,
 243                 .pitches = { p },
 244         };
 245         struct drm_gem_object *bo;
 246         struct drm_framebuffer *fb;
 247         int size;
 248
 249         /* allocate backing bo */
 250         size = mode_cmd.pitches[0] * mode_cmd.height;
 251         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 252         bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
 253         if (IS_ERR(bo)) {
 254                 dev_warn(dev->dev, "could not allocate stolen bo\n");
 255                 /* try regular bo: */
 256                 bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
 257         }
 258         if (IS_ERR(bo)) {
 259                 DRM_DEV_ERROR(dev->dev, "failed to allocate buffer object\n");
 260                 return ERR_CAST(bo);
 261         }
 262
 263         msm_gem_object_set_name(bo, "stolenfb");
 264
 265         fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
 266         if (IS_ERR(fb)) {
 267                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
 268                 /* note: if fb creation failed, we can't rely on fb destroy
 269                  * to unref the bo:
 270                  */
 271                 drm_gem_object_put(bo);
 272                 return ERR_CAST(fb);
 273         }
 274
 275         return fb;
 276 }