drivers/gpu/drm/udl/udl_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Red Hat
   4  *
   5  * based in parts on udlfb.c:
   6  * Copyright (C) 2009 Roberto De Ioris <[email protected]>
   7  * Copyright (C) 2009 Jaya Kumar <[email protected]>
   8  * Copyright (C) 2009 Bernie Thompson <[email protected]>
   9  */
  10
  11 #include <linux/moduleparam.h>
  12 #include <linux/dma-buf.h>
  13
  14 #include <drm/drm_crtc_helper.h>
  15 #include <drm/drm_drv.h>
  16 #include <drm/drm_fb_helper.h>
  17 #include <drm/drm_fourcc.h>
  18 #include <drm/drm_modeset_helper.h>
  19
  20 #include "udl_drv.h"
  21
  22 #define DL_DEFIO_WRITE_DELAY    (HZ/20) /* fb_deferred_io.delay in jiffies */
  23
  24 static int fb_defio = 0;  /* Optionally enable experimental fb_defio mmap support */
  25 static int fb_bpp = 16;
  26
  27 module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
  28 module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
  29
  30 struct udl_fbdev {
  31         struct drm_fb_helper helper; /* must be first */
  32         struct udl_framebuffer ufb;
  33         int fb_count;
  34 };
  35
  36 #define DL_ALIGN_UP(x, a) ALIGN(x, a)
  37 #define DL_ALIGN_DOWN(x, a) ALIGN_DOWN(x, a)
  38
  39 /** Read the red component (0..255) of a 32 bpp colour. */
  40 #define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)
  41
  42 /** Read the green component (0..255) of a 32 bpp colour. */
  43 #define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)
  44
  45 /** Read the blue component (0..255) of a 32 bpp colour. */
  46 #define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)
  47
  48 /** Return red/green component of a 16 bpp colour number. */
  49 #define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF)
  50
  51 /** Return green/blue component of a 16 bpp colour number. */
  52 #define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF)
  53
  54 /** Return 8 bpp colour number from red, green and blue components. */
  55 #define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF)
  56
  57 #if 0
  58 static uint8_t rgb8(uint32_t col)
  59 {
  60         uint8_t red = DLO_RGB_GETRED(col);
  61         uint8_t grn = DLO_RGB_GETGRN(col);
  62         uint8_t blu = DLO_RGB_GETBLU(col);
  63
  64         return DLO_RGB8(red, grn, blu);
  65 }
  66
  67 static uint16_t rgb16(uint32_t col)
  68 {
  69         uint8_t red = DLO_RGB_GETRED(col);
  70         uint8_t grn = DLO_RGB_GETGRN(col);
  71         uint8_t blu = DLO_RGB_GETBLU(col);
  72
  73         return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
  74 }
  75 #endif
  76
  77 int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
  78                       int width, int height)
  79 {
  80         struct drm_device *dev = fb->base.dev;
  81         struct udl_device *udl = to_udl(dev);
  82         int i, ret;
  83         char *cmd;
  84         cycles_t start_cycles, end_cycles;
  85         int bytes_sent = 0;
  86         int bytes_identical = 0;
  87         struct urb *urb;
  88         int aligned_x;
  89         int log_bpp;
  90
  91         BUG_ON(!is_power_of_2(fb->base.format->cpp[0]));
  92         log_bpp = __ffs(fb->base.format->cpp[0]);
  93
  94         if (!fb->active_16)
  95                 return 0;
  96
  97         if (!fb->obj->vmapping) {
  98                 ret = udl_gem_vmap(fb->obj);
  99                 if (ret == -ENOMEM) {
 100                         DRM_ERROR("failed to vmap fb\n");
 101                         return 0;
 102                 }
 103                 if (!fb->obj->vmapping) {
 104                         DRM_ERROR("failed to vmapping\n");
 105                         return 0;
 106                 }
 107         }
 108
 109         aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
 110         width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
 111         x = aligned_x;
 112
 113         if ((width <= 0) ||
 114             (x + width > fb->base.width) ||
 115             (y + height > fb->base.height))
 116                 return -EINVAL;
 117
 118         start_cycles = get_cycles();
 119
 120         urb = udl_get_urb(dev);
 121         if (!urb)
 122                 return 0;
 123         cmd = urb->transfer_buffer;
 124
 125         for (i = y; i < y + height ; i++) {
 126                 const int line_offset = fb->base.pitches[0] * i;
 127                 const int byte_offset = line_offset + (x << log_bpp);
 128                 const int dev_byte_offset = (fb->base.width * i + x) << log_bpp;
 129                 if (udl_render_hline(dev, log_bpp, &urb,
 130                                      (char *) fb->obj->vmapping,
 131                                      &cmd, byte_offset, dev_byte_offset,
 132                                      width << log_bpp,
 133                                      &bytes_identical, &bytes_sent))
 134                         goto error;
 135         }
 136
 137         if (cmd > (char *) urb->transfer_buffer) {
 138                 /* Send partial buffer remaining before exiting */
 139                 int len;
 140                 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
 141                         *cmd++ = 0xAF;
 142                 len = cmd - (char *) urb->transfer_buffer;
 143                 ret = udl_submit_urb(dev, urb, len);
 144                 bytes_sent += len;
 145         } else
 146                 udl_urb_completion(urb);
 147
 148 error:
 149         atomic_add(bytes_sent, &udl->bytes_sent);
 150         atomic_add(bytes_identical, &udl->bytes_identical);
 151         atomic_add((width * height) << log_bpp, &udl->bytes_rendered);
 152         end_cycles = get_cycles();
 153         atomic_add(((unsigned int) ((end_cycles - start_cycles)
 154                     >> 10)), /* Kcycles */
 155                    &udl->cpu_kcycles_used);
 156
 157         return 0;
 158 }
 159
 160 static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 161 {
 162         unsigned long start = vma->vm_start;
 163         unsigned long size = vma->vm_end - vma->vm_start;
 164         unsigned long offset;
 165         unsigned long page, pos;
 166
 167         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 168                 return -EINVAL;
 169
 170         offset = vma->vm_pgoff << PAGE_SHIFT;
 171
 172         if (offset > info->fix.smem_len || size > info->fix.smem_len - offset)
 173                 return -EINVAL;
 174
 175         pos = (unsigned long)info->fix.smem_start + offset;
 176
 177         pr_debug("mmap() framebuffer addr:%lu size:%lu\n",
 178                   pos, size);
 179
 180         /* We don't want the framebuffer to be mapped encrypted */
 181         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
 182
 183         while (size > 0) {
 184                 page = vmalloc_to_pfn((void *)pos);
 185                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 186                         return -EAGAIN;
 187
 188                 start += PAGE_SIZE;
 189                 pos += PAGE_SIZE;
 190                 if (size > PAGE_SIZE)
 191                         size -= PAGE_SIZE;
 192                 else
 193                         size = 0;
 194         }
 195
 196         /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
 197         return 0;
 198 }
 199
 200 /*
 201  * It's common for several clients to have framebuffer open simultaneously.
 202  * e.g. both fbcon and X. Makes things interesting.
 203  * Assumes caller is holding info->lock (for open and release at least)
 204  */
 205 static int udl_fb_open(struct fb_info *info, int user)
 206 {
 207         struct udl_fbdev *ufbdev = info->par;
 208         struct drm_device *dev = ufbdev->ufb.base.dev;
 209         struct udl_device *udl = to_udl(dev);
 210
 211         /* If the USB device is gone, we don't accept new opens */
 212         if (drm_dev_is_unplugged(&udl->drm))
 213                 return -ENODEV;
 214
 215         ufbdev->fb_count++;
 216
 217 #ifdef CONFIG_DRM_FBDEV_EMULATION
 218         if (fb_defio && (info->fbdefio == NULL)) {
 219                 /* enable defio at last moment if not disabled by client */
 220
 221                 struct fb_deferred_io *fbdefio;
 222
 223                 fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
 224
 225                 if (fbdefio) {
 226                         fbdefio->delay = DL_DEFIO_WRITE_DELAY;
 227                         fbdefio->deferred_io = drm_fb_helper_deferred_io;
 228                 }
 229
 230                 info->fbdefio = fbdefio;
 231                 fb_deferred_io_init(info);
 232         }
 233 #endif
 234
 235         pr_debug("open /dev/fb%d user=%d fb_info=%p count=%d\n",
 236                   info->node, user, info, ufbdev->fb_count);
 237
 238         return 0;
 239 }
 240
 241
 242 /*
 243  * Assumes caller is holding info->lock mutex (for open and release at least)
 244  */
 245 static int udl_fb_release(struct fb_info *info, int user)
 246 {
 247         struct udl_fbdev *ufbdev = info->par;
 248
 249         ufbdev->fb_count--;
 250
 251 #ifdef CONFIG_DRM_FBDEV_EMULATION
 252         if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
 253                 fb_deferred_io_cleanup(info);
 254                 kfree(info->fbdefio);
 255                 info->fbdefio = NULL;
 256                 info->fbops->fb_mmap = udl_fb_mmap;
 257         }
 258 #endif
 259
 260         pr_debug("released /dev/fb%d user=%d count=%d\n",
 261                 info->node, user, ufbdev->fb_count);
 262
 263         return 0;
 264 }
 265
 266 static struct fb_ops udlfb_ops = {
 267         .owner = THIS_MODULE,
 268         DRM_FB_HELPER_DEFAULT_OPS,
 269         .fb_fillrect = drm_fb_helper_sys_fillrect,
 270         .fb_copyarea = drm_fb_helper_sys_copyarea,
 271         .fb_imageblit = drm_fb_helper_sys_imageblit,
 272         .fb_mmap = udl_fb_mmap,
 273         .fb_open = udl_fb_open,
 274         .fb_release = udl_fb_release,
 275 };
 276
 277 static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
 278                                       struct drm_file *file,
 279                                       unsigned flags, unsigned color,
 280                                       struct drm_clip_rect *clips,
 281                                       unsigned num_clips)
 282 {
 283         struct udl_framebuffer *ufb = to_udl_fb(fb);
 284         int i;
 285         int ret = 0;
 286
 287         drm_modeset_lock_all(fb->dev);
 288
 289         if (!ufb->active_16)
 290                 goto unlock;
 291
 292         if (ufb->obj->base.import_attach) {
 293                 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
 294                                                DMA_FROM_DEVICE);
 295                 if (ret)
 296                         goto unlock;
 297         }
 298
 299         for (i = 0; i < num_clips; i++) {
 300                 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
 301                                   clips[i].x2 - clips[i].x1,
 302                                   clips[i].y2 - clips[i].y1);
 303                 if (ret)
 304                         break;
 305         }
 306
 307         if (ufb->obj->base.import_attach) {
 308                 ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
 309                                              DMA_FROM_DEVICE);
 310         }
 311
 312  unlock:
 313         drm_modeset_unlock_all(fb->dev);
 314
 315         return ret;
 316 }
 317
 318 static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 319 {
 320         struct udl_framebuffer *ufb = to_udl_fb(fb);
 321
 322         if (ufb->obj)
 323                 drm_gem_object_put_unlocked(&ufb->obj->base);
 324
 325         drm_framebuffer_cleanup(fb);
 326         kfree(ufb);
 327 }
 328
 329 static const struct drm_framebuffer_funcs udlfb_funcs = {
 330         .destroy = udl_user_framebuffer_destroy,
 331         .dirty = udl_user_framebuffer_dirty,
 332 };
 333
 334
 335 static int
 336 udl_framebuffer_init(struct drm_device *dev,
 337                      struct udl_framebuffer *ufb,
 338                      const struct drm_mode_fb_cmd2 *mode_cmd,
 339                      struct udl_gem_object *obj)
 340 {
 341         int ret;
 342
 343         ufb->obj = obj;
 344         drm_helper_mode_fill_fb_struct(dev, &ufb->base, mode_cmd);
 345         ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
 346         return ret;
 347 }
 348
 349
 350 static int udlfb_create(struct drm_fb_helper *helper,
 351                         struct drm_fb_helper_surface_size *sizes)
 352 {
 353         struct udl_fbdev *ufbdev =
 354                 container_of(helper, struct udl_fbdev, helper);
 355         struct drm_device *dev = ufbdev->helper.dev;
 356         struct fb_info *info;
 357         struct drm_framebuffer *fb;
 358         struct drm_mode_fb_cmd2 mode_cmd;
 359         struct udl_gem_object *obj;
 360         uint32_t size;
 361         int ret = 0;
 362
 363         if (sizes->surface_bpp == 24)
 364                 sizes->surface_bpp = 32;
 365
 366         mode_cmd.width = sizes->surface_width;
 367         mode_cmd.height = sizes->surface_height;
 368         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 369
 370         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 371                                                           sizes->surface_depth);
 372
 373         size = mode_cmd.pitches[0] * mode_cmd.height;
 374         size = ALIGN(size, PAGE_SIZE);
 375
 376         obj = udl_gem_alloc_object(dev, size);
 377         if (!obj)
 378                 goto out;
 379
 380         ret = udl_gem_vmap(obj);
 381         if (ret) {
 382                 DRM_ERROR("failed to vmap fb\n");
 383                 goto out_gfree;
 384         }
 385
 386         info = drm_fb_helper_alloc_fbi(helper);
 387         if (IS_ERR(info)) {
 388                 ret = PTR_ERR(info);
 389                 goto out_gfree;
 390         }
 391
 392         ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
 393         if (ret)
 394                 goto out_gfree;
 395
 396         fb = &ufbdev->ufb.base;
 397
 398         ufbdev->helper.fb = fb;
 399
 400         info->screen_base = ufbdev->ufb.obj->vmapping;
 401         info->fix.smem_len = size;
 402         info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
 403
 404         info->fbops = &udlfb_ops;
 405         drm_fb_helper_fill_info(info, &ufbdev->helper, sizes);
 406
 407         DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
 408                       fb->width, fb->height,
 409                       ufbdev->ufb.obj->vmapping);
 410
 411         return ret;
 412 out_gfree:
 413         drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
 414 out:
 415         return ret;
 416 }
 417
 418 static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
 419         .fb_probe = udlfb_create,
 420 };
 421
 422 static void udl_fbdev_destroy(struct drm_device *dev,
 423                               struct udl_fbdev *ufbdev)
 424 {
 425         drm_fb_helper_unregister_fbi(&ufbdev->helper);
 426         drm_fb_helper_fini(&ufbdev->helper);
 427         if (ufbdev->ufb.obj) {
 428                 drm_framebuffer_unregister_private(&ufbdev->ufb.base);
 429                 drm_framebuffer_cleanup(&ufbdev->ufb.base);
 430                 drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
 431         }
 432 }
 433
 434 int udl_fbdev_init(struct drm_device *dev)
 435 {
 436         struct udl_device *udl = to_udl(dev);
 437         int bpp_sel = fb_bpp;
 438         struct udl_fbdev *ufbdev;
 439         int ret;
 440
 441         ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
 442         if (!ufbdev)
 443                 return -ENOMEM;
 444
 445         udl->fbdev = ufbdev;
 446
 447         drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
 448
 449         ret = drm_fb_helper_init(dev, &ufbdev->helper, 1);
 450         if (ret)
 451                 goto free;
 452
 453         ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
 454         if (ret)
 455                 goto fini;
 456
 457         /* disable all the possible outputs/crtcs before entering KMS mode */
 458         drm_helper_disable_unused_functions(dev);
 459
 460         ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
 461         if (ret)
 462                 goto fini;
 463
 464         return 0;
 465
 466 fini:
 467         drm_fb_helper_fini(&ufbdev->helper);
 468 free:
 469         kfree(ufbdev);
 470         return ret;
 471 }
 472
 473 void udl_fbdev_cleanup(struct drm_device *dev)
 474 {
 475         struct udl_device *udl = to_udl(dev);
 476         if (!udl->fbdev)
 477                 return;
 478
 479         udl_fbdev_destroy(dev, udl->fbdev);
 480         kfree(udl->fbdev);
 481         udl->fbdev = NULL;
 482 }
 483
 484 void udl_fbdev_unplug(struct drm_device *dev)
 485 {
 486         struct udl_device *udl = to_udl(dev);
 487         struct udl_fbdev *ufbdev;
 488         if (!udl->fbdev)
 489                 return;
 490
 491         ufbdev = udl->fbdev;
 492         drm_fb_helper_unlink_fbi(&ufbdev->helper);
 493 }
 494
 495 struct drm_framebuffer *
 496 udl_fb_user_fb_create(struct drm_device *dev,
 497                    struct drm_file *file,
 498                    const struct drm_mode_fb_cmd2 *mode_cmd)
 499 {
 500         struct drm_gem_object *obj;
 501         struct udl_framebuffer *ufb;
 502         int ret;
 503         uint32_t size;
 504
 505         obj = drm_gem_object_lookup(file, mode_cmd->handles[0]);
 506         if (obj == NULL)
 507                 return ERR_PTR(-ENOENT);
 508
 509         size = mode_cmd->pitches[0] * mode_cmd->height;
 510         size = ALIGN(size, PAGE_SIZE);
 511
 512         if (size > obj->size) {
 513                 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
 514                 return ERR_PTR(-ENOMEM);
 515         }
 516
 517         ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
 518         if (ufb == NULL)
 519                 return ERR_PTR(-ENOMEM);
 520
 521         ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
 522         if (ret) {
 523                 kfree(ufb);
 524                 return ERR_PTR(-EINVAL);
 525         }
 526         return &ufb->base;
 527 }