drivers/gpu/drm/tegra/fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012-2013 Avionic Design GmbH
   4  * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
   5  *
   6  * Based on the KMS/FB CMA helpers
   7  *   Copyright (C) 2012 Analog Devices Inc.
   8  */
   9
  10 #include <linux/console.h>
  11
  12 #include <drm/drm_fourcc.h>
  13 #include <drm/drm_gem_framebuffer_helper.h>
  14 #include <drm/drm_modeset_helper.h>
  15
  16 #include "drm.h"
  17 #include "gem.h"
  18
  19 #ifdef CONFIG_DRM_FBDEV_EMULATION
  20 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
  21 {
  22         return container_of(helper, struct tegra_fbdev, base);
  23 }
  24 #endif
  25
  26 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
  27                                     unsigned int index)
  28 {
  29         return to_tegra_bo(drm_gem_fb_get_obj(framebuffer, index));
  30 }
  31
  32 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
  33 {
  34         struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, 0);
  35
  36         if (bo->flags & TEGRA_BO_BOTTOM_UP)
  37                 return true;
  38
  39         return false;
  40 }
  41
  42 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
  43                         struct tegra_bo_tiling *tiling)
  44 {
  45         uint64_t modifier = framebuffer->modifier;
  46
  47         if (fourcc_mod_is_vendor(modifier, NVIDIA)) {
  48                 if ((modifier & DRM_FORMAT_MOD_NVIDIA_SECTOR_LAYOUT) == 0)
  49                         tiling->sector_layout = TEGRA_BO_SECTOR_LAYOUT_TEGRA;
  50                 else
  51                         tiling->sector_layout = TEGRA_BO_SECTOR_LAYOUT_GPU;
  52
  53                 modifier &= ~DRM_FORMAT_MOD_NVIDIA_SECTOR_LAYOUT;
  54         }
  55
  56         switch (modifier) {
  57         case DRM_FORMAT_MOD_LINEAR:
  58                 tiling->mode = TEGRA_BO_TILING_MODE_PITCH;
  59                 tiling->value = 0;
  60                 break;
  61
  62         case DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED:
  63                 tiling->mode = TEGRA_BO_TILING_MODE_TILED;
  64                 tiling->value = 0;
  65                 break;
  66
  67         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0):
  68                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  69                 tiling->value = 0;
  70                 break;
  71
  72         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1):
  73                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  74                 tiling->value = 1;
  75                 break;
  76
  77         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2):
  78                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  79                 tiling->value = 2;
  80                 break;
  81
  82         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3):
  83                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  84                 tiling->value = 3;
  85                 break;
  86
  87         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4):
  88                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  89                 tiling->value = 4;
  90                 break;
  91
  92         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5):
  93                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  94                 tiling->value = 5;
  95                 break;
  96
  97         default:
  98                 DRM_DEBUG_KMS("unknown format modifier: %llx\n", modifier);
  99                 return -EINVAL;
 100         }
 101
 102         return 0;
 103 }
 104
 105 static const struct drm_framebuffer_funcs tegra_fb_funcs = {
 106         .destroy = drm_gem_fb_destroy,
 107         .create_handle = drm_gem_fb_create_handle,
 108 };
 109
 110 static struct drm_framebuffer *tegra_fb_alloc(struct drm_device *drm,
 111                                               const struct drm_mode_fb_cmd2 *mode_cmd,
 112                                               struct tegra_bo **planes,
 113                                               unsigned int num_planes)
 114 {
 115         struct drm_framebuffer *fb;
 116         unsigned int i;
 117         int err;
 118
 119         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 120         if (!fb)
 121                 return ERR_PTR(-ENOMEM);
 122
 123         drm_helper_mode_fill_fb_struct(drm, fb, mode_cmd);
 124
 125         for (i = 0; i < fb->format->num_planes; i++)
 126                 fb->obj[i] = &planes[i]->gem;
 127
 128         err = drm_framebuffer_init(drm, fb, &tegra_fb_funcs);
 129         if (err < 0) {
 130                 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
 131                         err);
 132                 kfree(fb);
 133                 return ERR_PTR(err);
 134         }
 135
 136         return fb;
 137 }
 138
 139 struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 140                                         struct drm_file *file,
 141                                         const struct drm_mode_fb_cmd2 *cmd)
 142 {
 143         const struct drm_format_info *info = drm_get_format_info(drm, cmd);
 144         struct tegra_bo *planes[4];
 145         struct drm_gem_object *gem;
 146         struct drm_framebuffer *fb;
 147         unsigned int i;
 148         int err;
 149
 150         for (i = 0; i < info->num_planes; i++) {
 151                 unsigned int width = cmd->width / (i ? info->hsub : 1);
 152                 unsigned int height = cmd->height / (i ? info->vsub : 1);
 153                 unsigned int size, bpp;
 154
 155                 gem = drm_gem_object_lookup(file, cmd->handles[i]);
 156                 if (!gem) {
 157                         err = -ENXIO;
 158                         goto unreference;
 159                 }
 160
 161                 bpp = info->cpp[i];
 162
 163                 size = (height - 1) * cmd->pitches[i] +
 164                        width * bpp + cmd->offsets[i];
 165
 166                 if (gem->size < size) {
 167                         err = -EINVAL;
 168                         goto unreference;
 169                 }
 170
 171                 planes[i] = to_tegra_bo(gem);
 172         }
 173
 174         fb = tegra_fb_alloc(drm, cmd, planes, i);
 175         if (IS_ERR(fb)) {
 176                 err = PTR_ERR(fb);
 177                 goto unreference;
 178         }
 179
 180         return fb;
 181
 182 unreference:
 183         while (i--)
 184                 drm_gem_object_put(&planes[i]->gem);
 185
 186         return ERR_PTR(err);
 187 }
 188
 189 #ifdef CONFIG_DRM_FBDEV_EMULATION
 190 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 191 {
 192         struct drm_fb_helper *helper = info->par;
 193         struct tegra_bo *bo;
 194         int err;
 195
 196         bo = tegra_fb_get_plane(helper->fb, 0);
 197
 198         err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
 199         if (err < 0)
 200                 return err;
 201
 202         return __tegra_gem_mmap(&bo->gem, vma);
 203 }
 204
 205 static const struct fb_ops tegra_fb_ops = {
 206         .owner = THIS_MODULE,
 207         DRM_FB_HELPER_DEFAULT_OPS,
 208         .fb_fillrect = drm_fb_helper_sys_fillrect,
 209         .fb_copyarea = drm_fb_helper_sys_copyarea,
 210         .fb_imageblit = drm_fb_helper_sys_imageblit,
 211         .fb_mmap = tegra_fb_mmap,
 212 };
 213
 214 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 215                              struct drm_fb_helper_surface_size *sizes)
 216 {
 217         struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
 218         struct tegra_drm *tegra = helper->dev->dev_private;
 219         struct drm_device *drm = helper->dev;
 220         struct drm_mode_fb_cmd2 cmd = { 0 };
 221         unsigned int bytes_per_pixel;
 222         struct drm_framebuffer *fb;
 223         unsigned long offset;
 224         struct fb_info *info;
 225         struct tegra_bo *bo;
 226         size_t size;
 227         int err;
 228
 229         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 230
 231         cmd.width = sizes->surface_width;
 232         cmd.height = sizes->surface_height;
 233         cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
 234                                   tegra->pitch_align);
 235
 236         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 237                                                      sizes->surface_depth);
 238
 239         size = cmd.pitches[0] * cmd.height;
 240
 241         bo = tegra_bo_create(drm, size, 0);
 242         if (IS_ERR(bo))
 243                 return PTR_ERR(bo);
 244
 245         info = drm_fb_helper_alloc_fbi(helper);
 246         if (IS_ERR(info)) {
 247                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 248                 drm_gem_object_put(&bo->gem);
 249                 return PTR_ERR(info);
 250         }
 251
 252         fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 253         if (IS_ERR(fbdev->fb)) {
 254                 err = PTR_ERR(fbdev->fb);
 255                 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",
 256                         err);
 257                 drm_gem_object_put(&bo->gem);
 258                 return PTR_ERR(fbdev->fb);
 259         }
 260
 261         fb = fbdev->fb;
 262         helper->fb = fb;
 263         helper->fbdev = info;
 264
 265         info->fbops = &tegra_fb_ops;
 266
 267         drm_fb_helper_fill_info(info, helper, sizes);
 268
 269         offset = info->var.xoffset * bytes_per_pixel +
 270                  info->var.yoffset * fb->pitches[0];
 271
 272         if (bo->pages) {
 273                 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
 274                                  pgprot_writecombine(PAGE_KERNEL));
 275                 if (!bo->vaddr) {
 276                         dev_err(drm->dev, "failed to vmap() framebuffer\n");
 277                         err = -ENOMEM;
 278                         goto destroy;
 279                 }
 280         }
 281
 282         drm->mode_config.fb_base = (resource_size_t)bo->iova;
 283         info->screen_base = (void __iomem *)bo->vaddr + offset;
 284         info->screen_size = size;
 285         info->fix.smem_start = (unsigned long)(bo->iova + offset);
 286         info->fix.smem_len = size;
 287
 288         return 0;
 289
 290 destroy:
 291         drm_framebuffer_remove(fb);
 292         return err;
 293 }
 294
 295 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 296         .fb_probe = tegra_fbdev_probe,
 297 };
 298
 299 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
 300 {
 301         struct tegra_fbdev *fbdev;
 302
 303         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 304         if (!fbdev) {
 305                 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
 306                 return ERR_PTR(-ENOMEM);
 307         }
 308
 309         drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs);
 310
 311         return fbdev;
 312 }
 313
 314 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 315 {
 316         kfree(fbdev);
 317 }
 318
 319 static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
 320                             unsigned int preferred_bpp,
 321                             unsigned int num_crtc,
 322                             unsigned int max_connectors)
 323 {
 324         struct drm_device *drm = fbdev->base.dev;
 325         int err;
 326
 327         err = drm_fb_helper_init(drm, &fbdev->base);
 328         if (err < 0) {
 329                 dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n",
 330                         err);
 331                 return err;
 332         }
 333
 334         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 335         if (err < 0) {
 336                 dev_err(drm->dev, "failed to set initial configuration: %d\n",
 337                         err);
 338                 goto fini;
 339         }
 340
 341         return 0;
 342
 343 fini:
 344         drm_fb_helper_fini(&fbdev->base);
 345         return err;
 346 }
 347
 348 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 349 {
 350         drm_fb_helper_unregister_fbi(&fbdev->base);
 351
 352         if (fbdev->fb) {
 353                 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
 354
 355                 /* Undo the special mapping we made in fbdev probe. */
 356                 if (bo && bo->pages) {
 357                         vunmap(bo->vaddr);
 358                         bo->vaddr = NULL;
 359                 }
 360
 361                 drm_framebuffer_remove(fbdev->fb);
 362         }
 363
 364         drm_fb_helper_fini(&fbdev->base);
 365         tegra_fbdev_free(fbdev);
 366 }
 367 #endif
 368
 369 int tegra_drm_fb_prepare(struct drm_device *drm)
 370 {
 371 #ifdef CONFIG_DRM_FBDEV_EMULATION
 372         struct tegra_drm *tegra = drm->dev_private;
 373
 374         tegra->fbdev = tegra_fbdev_create(drm);
 375         if (IS_ERR(tegra->fbdev))
 376                 return PTR_ERR(tegra->fbdev);
 377 #endif
 378
 379         return 0;
 380 }
 381
 382 void tegra_drm_fb_free(struct drm_device *drm)
 383 {
 384 #ifdef CONFIG_DRM_FBDEV_EMULATION
 385         struct tegra_drm *tegra = drm->dev_private;
 386
 387         tegra_fbdev_free(tegra->fbdev);
 388 #endif
 389 }
 390
 391 int tegra_drm_fb_init(struct drm_device *drm)
 392 {
 393 #ifdef CONFIG_DRM_FBDEV_EMULATION
 394         struct tegra_drm *tegra = drm->dev_private;
 395         int err;
 396
 397         err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
 398                                drm->mode_config.num_connector);
 399         if (err < 0)
 400                 return err;
 401 #endif
 402
 403         return 0;
 404 }
 405
 406 void tegra_drm_fb_exit(struct drm_device *drm)
 407 {
 408 #ifdef CONFIG_DRM_FBDEV_EMULATION
 409         struct tegra_drm *tegra = drm->dev_private;
 410
 411         tegra_fbdev_exit(tegra->fbdev);
 412 #endif
 413 }