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 DMA 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_framebuffer.h>
  14 #include <drm/drm_gem_framebuffer_helper.h>
  15 #include <drm/drm_modeset_helper.h>
  16
  17 #include "drm.h"
  18 #include "gem.h"
  19
  20 #ifdef CONFIG_DRM_FBDEV_EMULATION
  21 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
  22 {
  23         return container_of(helper, struct tegra_fbdev, base);
  24 }
  25 #endif
  26
  27 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
  28                                     unsigned int index)
  29 {
  30         return to_tegra_bo(drm_gem_fb_get_obj(framebuffer, index));
  31 }
  32
  33 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
  34 {
  35         struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, 0);
  36
  37         if (bo->flags & TEGRA_BO_BOTTOM_UP)
  38                 return true;
  39
  40         return false;
  41 }
  42
  43 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
  44                         struct tegra_bo_tiling *tiling)
  45 {
  46         uint64_t modifier = framebuffer->modifier;
  47
  48         if (fourcc_mod_is_vendor(modifier, NVIDIA)) {
  49                 if ((modifier & DRM_FORMAT_MOD_NVIDIA_SECTOR_LAYOUT) == 0)
  50                         tiling->sector_layout = TEGRA_BO_SECTOR_LAYOUT_TEGRA;
  51                 else
  52                         tiling->sector_layout = TEGRA_BO_SECTOR_LAYOUT_GPU;
  53
  54                 modifier &= ~DRM_FORMAT_MOD_NVIDIA_SECTOR_LAYOUT;
  55         }
  56
  57         switch (modifier) {
  58         case DRM_FORMAT_MOD_LINEAR:
  59                 tiling->mode = TEGRA_BO_TILING_MODE_PITCH;
  60                 tiling->value = 0;
  61                 break;
  62
  63         case DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED:
  64                 tiling->mode = TEGRA_BO_TILING_MODE_TILED;
  65                 tiling->value = 0;
  66                 break;
  67
  68         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0):
  69                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  70                 tiling->value = 0;
  71                 break;
  72
  73         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1):
  74                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  75                 tiling->value = 1;
  76                 break;
  77
  78         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2):
  79                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  80                 tiling->value = 2;
  81                 break;
  82
  83         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3):
  84                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  85                 tiling->value = 3;
  86                 break;
  87
  88         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4):
  89                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  90                 tiling->value = 4;
  91                 break;
  92
  93         case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5):
  94                 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
  95                 tiling->value = 5;
  96                 break;
  97
  98         default:
  99                 DRM_DEBUG_KMS("unknown format modifier: %llx\n", modifier);
 100                 return -EINVAL;
 101         }
 102
 103         return 0;
 104 }
 105
 106 static const struct drm_framebuffer_funcs tegra_fb_funcs = {
 107         .destroy = drm_gem_fb_destroy,
 108         .create_handle = drm_gem_fb_create_handle,
 109 };
 110
 111 static struct drm_framebuffer *tegra_fb_alloc(struct drm_device *drm,
 112                                               const struct drm_mode_fb_cmd2 *mode_cmd,
 113                                               struct tegra_bo **planes,
 114                                               unsigned int num_planes)
 115 {
 116         struct drm_framebuffer *fb;
 117         unsigned int i;
 118         int err;
 119
 120         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 121         if (!fb)
 122                 return ERR_PTR(-ENOMEM);
 123
 124         drm_helper_mode_fill_fb_struct(drm, fb, mode_cmd);
 125
 126         for (i = 0; i < fb->format->num_planes; i++)
 127                 fb->obj[i] = &planes[i]->gem;
 128
 129         err = drm_framebuffer_init(drm, fb, &tegra_fb_funcs);
 130         if (err < 0) {
 131                 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
 132                         err);
 133                 kfree(fb);
 134                 return ERR_PTR(err);
 135         }
 136
 137         return fb;
 138 }
 139
 140 struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 141                                         struct drm_file *file,
 142                                         const struct drm_mode_fb_cmd2 *cmd)
 143 {
 144         const struct drm_format_info *info = drm_get_format_info(drm, cmd);
 145         struct tegra_bo *planes[4];
 146         struct drm_gem_object *gem;
 147         struct drm_framebuffer *fb;
 148         unsigned int i;
 149         int err;
 150
 151         for (i = 0; i < info->num_planes; i++) {
 152                 unsigned int width = cmd->width / (i ? info->hsub : 1);
 153                 unsigned int height = cmd->height / (i ? info->vsub : 1);
 154                 unsigned int size, bpp;
 155
 156                 gem = drm_gem_object_lookup(file, cmd->handles[i]);
 157                 if (!gem) {
 158                         err = -ENXIO;
 159                         goto unreference;
 160                 }
 161
 162                 bpp = info->cpp[i];
 163
 164                 size = (height - 1) * cmd->pitches[i] +
 165                        width * bpp + cmd->offsets[i];
 166
 167                 if (gem->size < size) {
 168                         err = -EINVAL;
 169                         goto unreference;
 170                 }
 171
 172                 planes[i] = to_tegra_bo(gem);
 173         }
 174
 175         fb = tegra_fb_alloc(drm, cmd, planes, i);
 176         if (IS_ERR(fb)) {
 177                 err = PTR_ERR(fb);
 178                 goto unreference;
 179         }
 180
 181         return fb;
 182
 183 unreference:
 184         while (i--)
 185                 drm_gem_object_put(&planes[i]->gem);
 186
 187         return ERR_PTR(err);
 188 }
 189
 190 #ifdef CONFIG_DRM_FBDEV_EMULATION
 191 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 192 {
 193         struct drm_fb_helper *helper = info->par;
 194         struct tegra_bo *bo;
 195         int err;
 196
 197         bo = tegra_fb_get_plane(helper->fb, 0);
 198
 199         err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
 200         if (err < 0)
 201                 return err;
 202
 203         return __tegra_gem_mmap(&bo->gem, vma);
 204 }
 205
 206 static const struct fb_ops tegra_fb_ops = {
 207         .owner = THIS_MODULE,
 208         DRM_FB_HELPER_DEFAULT_OPS,
 209         .fb_read = drm_fb_helper_sys_read,
 210         .fb_write = drm_fb_helper_sys_write,
 211         .fb_fillrect = drm_fb_helper_sys_fillrect,
 212         .fb_copyarea = drm_fb_helper_sys_copyarea,
 213         .fb_imageblit = drm_fb_helper_sys_imageblit,
 214         .fb_mmap = tegra_fb_mmap,
 215 };
 216
 217 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 218                              struct drm_fb_helper_surface_size *sizes)
 219 {
 220         struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
 221         struct tegra_drm *tegra = helper->dev->dev_private;
 222         struct drm_device *drm = helper->dev;
 223         struct drm_mode_fb_cmd2 cmd = { 0 };
 224         unsigned int bytes_per_pixel;
 225         struct drm_framebuffer *fb;
 226         unsigned long offset;
 227         struct fb_info *info;
 228         struct tegra_bo *bo;
 229         size_t size;
 230         int err;
 231
 232         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 233
 234         cmd.width = sizes->surface_width;
 235         cmd.height = sizes->surface_height;
 236         cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
 237                                   tegra->pitch_align);
 238
 239         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 240                                                      sizes->surface_depth);
 241
 242         size = cmd.pitches[0] * cmd.height;
 243
 244         bo = tegra_bo_create(drm, size, 0);
 245         if (IS_ERR(bo))
 246                 return PTR_ERR(bo);
 247
 248         info = drm_fb_helper_alloc_info(helper);
 249         if (IS_ERR(info)) {
 250                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 251                 drm_gem_object_put(&bo->gem);
 252                 return PTR_ERR(info);
 253         }
 254
 255         fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 256         if (IS_ERR(fbdev->fb)) {
 257                 err = PTR_ERR(fbdev->fb);
 258                 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",
 259                         err);
 260                 drm_gem_object_put(&bo->gem);
 261                 return PTR_ERR(fbdev->fb);
 262         }
 263
 264         fb = fbdev->fb;
 265         helper->fb = fb;
 266         helper->info = info;
 267
 268         info->fbops = &tegra_fb_ops;
 269
 270         drm_fb_helper_fill_info(info, helper, sizes);
 271
 272         offset = info->var.xoffset * bytes_per_pixel +
 273                  info->var.yoffset * fb->pitches[0];
 274
 275         if (bo->pages) {
 276                 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
 277                                  pgprot_writecombine(PAGE_KERNEL));
 278                 if (!bo->vaddr) {
 279                         dev_err(drm->dev, "failed to vmap() framebuffer\n");
 280                         err = -ENOMEM;
 281                         goto destroy;
 282                 }
 283         }
 284
 285         info->screen_base = (void __iomem *)bo->vaddr + offset;
 286         info->screen_size = size;
 287         info->fix.smem_start = (unsigned long)(bo->iova + offset);
 288         info->fix.smem_len = size;
 289
 290         return 0;
 291
 292 destroy:
 293         drm_framebuffer_remove(fb);
 294         return err;
 295 }
 296
 297 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 298         .fb_probe = tegra_fbdev_probe,
 299 };
 300
 301 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
 302 {
 303         struct tegra_fbdev *fbdev;
 304
 305         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 306         if (!fbdev) {
 307                 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
 308                 return ERR_PTR(-ENOMEM);
 309         }
 310
 311         drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs);
 312
 313         return fbdev;
 314 }
 315
 316 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 317 {
 318         kfree(fbdev);
 319 }
 320
 321 static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
 322                             unsigned int preferred_bpp,
 323                             unsigned int num_crtc,
 324                             unsigned int max_connectors)
 325 {
 326         struct drm_device *drm = fbdev->base.dev;
 327         int err;
 328
 329         err = drm_fb_helper_init(drm, &fbdev->base);
 330         if (err < 0) {
 331                 dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n",
 332                         err);
 333                 return err;
 334         }
 335
 336         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 337         if (err < 0) {
 338                 dev_err(drm->dev, "failed to set initial configuration: %d\n",
 339                         err);
 340                 goto fini;
 341         }
 342
 343         return 0;
 344
 345 fini:
 346         drm_fb_helper_fini(&fbdev->base);
 347         return err;
 348 }
 349
 350 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 351 {
 352         drm_fb_helper_unregister_info(&fbdev->base);
 353
 354         if (fbdev->fb) {
 355                 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
 356
 357                 /* Undo the special mapping we made in fbdev probe. */
 358                 if (bo && bo->pages) {
 359                         vunmap(bo->vaddr);
 360                         bo->vaddr = NULL;
 361                 }
 362
 363                 drm_framebuffer_remove(fbdev->fb);
 364         }
 365
 366         drm_fb_helper_fini(&fbdev->base);
 367         tegra_fbdev_free(fbdev);
 368 }
 369 #endif
 370
 371 int tegra_drm_fb_prepare(struct drm_device *drm)
 372 {
 373 #ifdef CONFIG_DRM_FBDEV_EMULATION
 374         struct tegra_drm *tegra = drm->dev_private;
 375
 376         tegra->fbdev = tegra_fbdev_create(drm);
 377         if (IS_ERR(tegra->fbdev))
 378                 return PTR_ERR(tegra->fbdev);
 379 #endif
 380
 381         return 0;
 382 }
 383
 384 void tegra_drm_fb_free(struct drm_device *drm)
 385 {
 386 #ifdef CONFIG_DRM_FBDEV_EMULATION
 387         struct tegra_drm *tegra = drm->dev_private;
 388
 389         tegra_fbdev_free(tegra->fbdev);
 390 #endif
 391 }
 392
 393 int tegra_drm_fb_init(struct drm_device *drm)
 394 {
 395 #ifdef CONFIG_DRM_FBDEV_EMULATION
 396         struct tegra_drm *tegra = drm->dev_private;
 397         int err;
 398
 399         err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
 400                                drm->mode_config.num_connector);
 401         if (err < 0)
 402                 return err;
 403 #endif
 404
 405         return 0;
 406 }
 407
 408 void tegra_drm_fb_exit(struct drm_device *drm)
 409 {
 410 #ifdef CONFIG_DRM_FBDEV_EMULATION
 411         struct tegra_drm *tegra = drm->dev_private;
 412
 413         tegra_fbdev_exit(tegra->fbdev);
 414 #endif
 415 }