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 <robdclark@gmail.com>
   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_framebuffer.h>
  12 #include <drm/drm_gem_framebuffer_helper.h>
  13 #include <drm/drm_probe_helper.h>
  14
  15 #include "msm_drv.h"
  16 #include "msm_kms.h"
  17 #include "msm_gem.h"
  18
  19 struct msm_framebuffer {
  20         struct drm_framebuffer base;
  21         const struct msm_format *format;
  22
  23         /* Count of # of attached planes which need dirtyfb: */
  24         refcount_t dirtyfb;
  25
  26         /* Framebuffer per-plane address, if pinned, else zero: */
  27         uint64_t iova[DRM_FORMAT_MAX_PLANES];
  28         atomic_t prepare_count;
  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_dirtyfb(struct drm_framebuffer *fb,
  36                                    struct drm_file *file_priv, unsigned int flags,
  37                                    unsigned int color, struct drm_clip_rect *clips,
  38                                    unsigned int num_clips)
  39 {
  40         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  41
  42         /* If this fb is not used on any display requiring pixel data to be
  43          * flushed, then skip dirtyfb
  44          */
  45         if (refcount_read(&msm_fb->dirtyfb) == 1)
  46                 return 0;
  47
  48         return drm_atomic_helper_dirtyfb(fb, file_priv, flags, color,
  49                                          clips, num_clips);
  50 }
  51
  52 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
  53         .create_handle = drm_gem_fb_create_handle,
  54         .destroy = drm_gem_fb_destroy,
  55         .dirty = msm_framebuffer_dirtyfb,
  56 };
  57
  58 #ifdef CONFIG_DEBUG_FS
  59 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
  60 {
  61         struct msm_gem_stats stats = {};
  62         int i, n = fb->format->num_planes;
  63
  64         seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
  65                         fb->width, fb->height, (char *)&fb->format->format,
  66                         drm_framebuffer_read_refcount(fb), fb->base.id);
  67
  68         for (i = 0; i < n; i++) {
  69                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
  70                                 i, fb->offsets[i], fb->pitches[i]);
  71                 msm_gem_describe(fb->obj[i], m, &stats);
  72         }
  73 }
  74 #endif
  75
  76 /* prepare/pin all the fb's bo's for scanout.
  77  */
  78 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
  79                 struct msm_gem_address_space *aspace,
  80                 bool needs_dirtyfb)
  81 {
  82         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  83         int ret, i, n = fb->format->num_planes;
  84
  85         if (needs_dirtyfb)
  86                 refcount_inc(&msm_fb->dirtyfb);
  87
  88         atomic_inc(&msm_fb->prepare_count);
  89
  90         for (i = 0; i < n; i++) {
  91                 ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &msm_fb->iova[i]);
  92                 drm_dbg_state(fb->dev, "FB[%u]: iova[%d]: %08llx (%d)\n",
  93                               fb->base.id, i, msm_fb->iova[i], ret);
  94                 if (ret)
  95                         return ret;
  96         }
  97
  98         return 0;
  99 }
 100
 101 void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
 102                 struct msm_gem_address_space *aspace,
 103                 bool needed_dirtyfb)
 104 {
 105         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 106         int i, n = fb->format->num_planes;
 107
 108         if (needed_dirtyfb)
 109                 refcount_dec(&msm_fb->dirtyfb);
 110
 111         for (i = 0; i < n; i++)
 112                 msm_gem_unpin_iova(fb->obj[i], aspace);
 113
 114         if (!atomic_dec_return(&msm_fb->prepare_count))
 115                 memset(msm_fb->iova, 0, sizeof(msm_fb->iova));
 116 }
 117
 118 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
 119                 struct msm_gem_address_space *aspace, int plane)
 120 {
 121         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 122         return msm_fb->iova[plane] + fb->offsets[plane];
 123 }
 124
 125 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
 126 {
 127         return drm_gem_fb_get_obj(fb, plane);
 128 }
 129
 130 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 131 {
 132         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 133         return msm_fb->format;
 134 }
 135
 136 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 137                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 138 {
 139         const struct drm_format_info *info = drm_get_format_info(dev,
 140                                                                  mode_cmd);
 141         struct drm_gem_object *bos[4] = {0};
 142         struct drm_framebuffer *fb;
 143         int ret, i, n = info->num_planes;
 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_put(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         const struct drm_format_info *info = drm_get_format_info(dev,
 171                                                                  mode_cmd);
 172         struct msm_drm_private *priv = dev->dev_private;
 173         struct msm_kms *kms = priv->kms;
 174         struct msm_framebuffer *msm_fb = NULL;
 175         struct drm_framebuffer *fb;
 176         const struct msm_format *format;
 177         int ret, i, n;
 178
 179         drm_dbg_state(dev, "create framebuffer: mode_cmd=%p (%dx%d@%4.4s)\n",
 180                         mode_cmd, mode_cmd->width, mode_cmd->height,
 181                         (char *)&mode_cmd->pixel_format);
 182
 183         n = info->num_planes;
 184         format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
 185                         mode_cmd->modifier[0]);
 186         if (!format) {
 187                 DRM_DEV_ERROR(dev->dev, "unsupported pixel format: %4.4s\n",
 188                                 (char *)&mode_cmd->pixel_format);
 189                 ret = -EINVAL;
 190                 goto fail;
 191         }
 192
 193         msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 194         if (!msm_fb) {
 195                 ret = -ENOMEM;
 196                 goto fail;
 197         }
 198
 199         fb = &msm_fb->base;
 200
 201         msm_fb->format = format;
 202
 203         if (n > ARRAY_SIZE(fb->obj)) {
 204                 ret = -EINVAL;
 205                 goto fail;
 206         }
 207
 208         for (i = 0; i < n; i++) {
 209                 unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
 210                 unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
 211                 unsigned int min_size;
 212
 213                 min_size = (height - 1) * mode_cmd->pitches[i]
 214                          + width * info->cpp[i]
 215                          + mode_cmd->offsets[i];
 216
 217                 if (bos[i]->size < min_size) {
 218                         ret = -EINVAL;
 219                         goto fail;
 220                 }
 221
 222                 msm_fb->base.obj[i] = bos[i];
 223         }
 224
 225         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 226
 227         ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 228         if (ret) {
 229                 DRM_DEV_ERROR(dev->dev, "framebuffer init failed: %d\n", ret);
 230                 goto fail;
 231         }
 232
 233         refcount_set(&msm_fb->dirtyfb, 1);
 234
 235         drm_dbg_state(dev, "create: FB ID: %d (%p)\n", fb->base.id, fb);
 236
 237         return fb;
 238
 239 fail:
 240         kfree(msm_fb);
 241
 242         return ERR_PTR(ret);
 243 }
 244
 245 struct drm_framebuffer *
 246 msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
 247 {
 248         struct drm_mode_fb_cmd2 mode_cmd = {
 249                 .pixel_format = format,
 250                 .width = w,
 251                 .height = h,
 252                 .pitches = { p },
 253         };
 254         struct drm_gem_object *bo;
 255         struct drm_framebuffer *fb;
 256         int size;
 257
 258         /* allocate backing bo */
 259         size = mode_cmd.pitches[0] * mode_cmd.height;
 260         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 261         bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
 262         if (IS_ERR(bo)) {
 263                 dev_warn(dev->dev, "could not allocate stolen bo\n");
 264                 /* try regular bo: */
 265                 bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
 266         }
 267         if (IS_ERR(bo)) {
 268                 DRM_DEV_ERROR(dev->dev, "failed to allocate buffer object\n");
 269                 return ERR_CAST(bo);
 270         }
 271
 272         msm_gem_object_set_name(bo, "stolenfb");
 273
 274         fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
 275         if (IS_ERR(fb)) {
 276                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
 277                 /* note: if fb creation failed, we can't rely on fb destroy
 278                  * to unref the bo:
 279                  */
 280                 drm_gem_object_put(bo);
 281                 return ERR_CAST(fb);
 282         }
 283
 284         return fb;
 285 }