drivers/gpu/drm/udl/udl_fb.c

   1 /*
   2  * Copyright (C) 2012 Red Hat
   3  *
   4  * based in parts on udlfb.c:
   5  * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
   6  * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
   7  * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License v2. See the file COPYING in the main directory of this archive for
  11  * more details.
  12  */
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/fb.h>
  16 #include <linux/dma-buf.h>
  17 #include <linux/mem_encrypt.h>
  18
  19 #include <drm/drmP.h>
  20 #include <drm/drm_crtc.h>
  21 #include <drm/drm_crtc_helper.h>
  22 #include "udl_drv.h"
  23
  24 #include <drm/drm_fb_helper.h>
  25
  26 #define DL_DEFIO_WRITE_DELAY    (HZ/20) /* fb_deferred_io.delay in jiffies */
  27
  28 static int fb_defio = 0;  /* Optionally enable experimental fb_defio mmap support */
  29 static int fb_bpp = 16;
  30
  31 module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
  32 module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
  33
  34 struct udl_fbdev {
  35         struct drm_fb_helper helper;
  36         struct udl_framebuffer ufb;
  37         int fb_count;
  38 };
  39
  40 #define DL_ALIGN_UP(x, a) ALIGN(x, a)
  41 #define DL_ALIGN_DOWN(x, a) ALIGN_DOWN(x, a)
  42
  43 /** Read the red component (0..255) of a 32 bpp colour. */
  44 #define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)
  45
  46 /** Read the green component (0..255) of a 32 bpp colour. */
  47 #define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)
  48
  49 /** Read the blue component (0..255) of a 32 bpp colour. */
  50 #define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)
  51
  52 /** Return red/green component of a 16 bpp colour number. */
  53 #define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF)
  54
  55 /** Return green/blue component of a 16 bpp colour number. */
  56 #define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF)
  57
  58 /** Return 8 bpp colour number from red, green and blue components. */
  59 #define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF)
  60
  61 #if 0
  62 static uint8_t rgb8(uint32_t col)
  63 {
  64         uint8_t red = DLO_RGB_GETRED(col);
  65         uint8_t grn = DLO_RGB_GETGRN(col);
  66         uint8_t blu = DLO_RGB_GETBLU(col);
  67
  68         return DLO_RGB8(red, grn, blu);
  69 }
  70
  71 static uint16_t rgb16(uint32_t col)
  72 {
  73         uint8_t red = DLO_RGB_GETRED(col);
  74         uint8_t grn = DLO_RGB_GETGRN(col);
  75         uint8_t blu = DLO_RGB_GETBLU(col);
  76
  77         return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
  78 }
  79 #endif
  80
  81 int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
  82                       int width, int height)
  83 {
  84         struct drm_device *dev = fb->base.dev;
  85         struct udl_device *udl = dev->dev_private;
  86         int i, ret;
  87         char *cmd;
  88         cycles_t start_cycles, end_cycles;
  89         int bytes_sent = 0;
  90         int bytes_identical = 0;
  91         struct urb *urb;
  92         int aligned_x;
  93         int log_bpp;
  94
  95         BUG_ON(!is_power_of_2(fb->base.format->cpp[0]));
  96         log_bpp = __ffs(fb->base.format->cpp[0]);
  97
  98         if (!fb->active_16)
  99                 return 0;
 100
 101         if (!fb->obj->vmapping) {
 102                 ret = udl_gem_vmap(fb->obj);
 103                 if (ret == -ENOMEM) {
 104                         DRM_ERROR("failed to vmap fb\n");
 105                         return 0;
 106                 }
 107                 if (!fb->obj->vmapping) {
 108                         DRM_ERROR("failed to vmapping\n");
 109                         return 0;
 110                 }
 111         }
 112
 113         aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
 114         width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
 115         x = aligned_x;
 116
 117         if ((width <= 0) ||
 118             (x + width > fb->base.width) ||
 119             (y + height > fb->base.height))
 120                 return -EINVAL;
 121
 122         start_cycles = get_cycles();
 123
 124         urb = udl_get_urb(dev);
 125         if (!urb)
 126                 return 0;
 127         cmd = urb->transfer_buffer;
 128
 129         for (i = y; i < y + height ; i++) {
 130                 const int line_offset = fb->base.pitches[0] * i;
 131                 const int byte_offset = line_offset + (x << log_bpp);
 132                 const int dev_byte_offset = (fb->base.width * i + x) << log_bpp;
 133                 if (udl_render_hline(dev, log_bpp, &urb,
 134                                      (char *) fb->obj->vmapping,
 135                                      &cmd, byte_offset, dev_byte_offset,
 136                                      width << log_bpp,
 137                                      &bytes_identical, &bytes_sent))
 138                         goto error;
 139         }
 140
 141         if (cmd > (char *) urb->transfer_buffer) {
 142                 /* Send partial buffer remaining before exiting */
 143                 int len;
 144                 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
 145                         *cmd++ = 0xAF;
 146                 len = cmd - (char *) urb->transfer_buffer;
 147                 ret = udl_submit_urb(dev, urb, len);
 148                 bytes_sent += len;
 149         } else
 150                 udl_urb_completion(urb);
 151
 152 error:
 153         atomic_add(bytes_sent, &udl->bytes_sent);
 154         atomic_add(bytes_identical, &udl->bytes_identical);
 155         atomic_add((width * height) << log_bpp, &udl->bytes_rendered);
 156         end_cycles = get_cycles();
 157         atomic_add(((unsigned int) ((end_cycles - start_cycles)
 158                     >> 10)), /* Kcycles */
 159                    &udl->cpu_kcycles_used);
 160
 161         return 0;
 162 }
 163
 164 static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 165 {
 166         unsigned long start = vma->vm_start;
 167         unsigned long size = vma->vm_end - vma->vm_start;
 168         unsigned long offset;
 169         unsigned long page, pos;
 170
 171         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 172                 return -EINVAL;
 173
 174         offset = vma->vm_pgoff << PAGE_SHIFT;
 175
 176         if (offset > info->fix.smem_len || size > info->fix.smem_len - offset)
 177                 return -EINVAL;
 178
 179         pos = (unsigned long)info->fix.smem_start + offset;
 180
 181         pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
 182                   pos, size);
 183
 184         /* We don't want the framebuffer to be mapped encrypted */
 185         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
 186
 187         while (size > 0) {
 188                 page = vmalloc_to_pfn((void *)pos);
 189                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 190                         return -EAGAIN;
 191
 192                 start += PAGE_SIZE;
 193                 pos += PAGE_SIZE;
 194                 if (size > PAGE_SIZE)
 195                         size -= PAGE_SIZE;
 196                 else
 197                         size = 0;
 198         }
 199
 200         /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
 201         return 0;
 202 }
 203
 204 /*
 205  * It's common for several clients to have framebuffer open simultaneously.
 206  * e.g. both fbcon and X. Makes things interesting.
 207  * Assumes caller is holding info->lock (for open and release at least)
 208  */
 209 static int udl_fb_open(struct fb_info *info, int user)
 210 {
 211         struct udl_fbdev *ufbdev = info->par;
 212         struct drm_device *dev = ufbdev->ufb.base.dev;
 213         struct udl_device *udl = dev->dev_private;
 214
 215         /* If the USB device is gone, we don't accept new opens */
 216         if (drm_dev_is_unplugged(udl->ddev))
 217                 return -ENODEV;
 218
 219         ufbdev->fb_count++;
 220
 221 #ifdef CONFIG_DRM_FBDEV_EMULATION
 222         if (fb_defio && (info->fbdefio == NULL)) {
 223                 /* enable defio at last moment if not disabled by client */
 224
 225                 struct fb_deferred_io *fbdefio;
 226
 227                 fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
 228
 229                 if (fbdefio) {
 230                         fbdefio->delay = DL_DEFIO_WRITE_DELAY;
 231                         fbdefio->deferred_io = drm_fb_helper_deferred_io;
 232                 }
 233
 234                 info->fbdefio = fbdefio;
 235                 fb_deferred_io_init(info);
 236         }
 237 #endif
 238
 239         pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
 240                   info->node, user, info, ufbdev->fb_count);
 241
 242         return 0;
 243 }
 244
 245
 246 /*
 247  * Assumes caller is holding info->lock mutex (for open and release at least)
 248  */
 249 static int udl_fb_release(struct fb_info *info, int user)
 250 {
 251         struct udl_fbdev *ufbdev = info->par;
 252
 253         ufbdev->fb_count--;
 254
 255 #ifdef CONFIG_DRM_FBDEV_EMULATION
 256         if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
 257                 fb_deferred_io_cleanup(info);
 258                 kfree(info->fbdefio);
 259                 info->fbdefio = NULL;
 260                 info->fbops->fb_mmap = udl_fb_mmap;
 261         }
 262 #endif
 263
 264         pr_warn("released /dev/fb%d user=%d count=%d\n",
 265                 info->node, user, ufbdev->fb_count);
 266
 267         return 0;
 268 }
 269
 270 static struct fb_ops udlfb_ops = {
 271         .owner = THIS_MODULE,
 272         DRM_FB_HELPER_DEFAULT_OPS,
 273         .fb_fillrect = drm_fb_helper_sys_fillrect,
 274         .fb_copyarea = drm_fb_helper_sys_copyarea,
 275         .fb_imageblit = drm_fb_helper_sys_imageblit,
 276         .fb_mmap = udl_fb_mmap,
 277         .fb_open = udl_fb_open,
 278         .fb_release = udl_fb_release,
 279 };
 280
 281 static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
 282                                       struct drm_file *file,
 283                                       unsigned flags, unsigned color,
 284                                       struct drm_clip_rect *clips,
 285                                       unsigned num_clips)
 286 {
 287         struct udl_framebuffer *ufb = to_udl_fb(fb);
 288         int i;
 289         int ret = 0;
 290
 291         drm_modeset_lock_all(fb->dev);
 292
 293         if (!ufb->active_16)
 294                 goto unlock;
 295
 296         if (ufb->obj->base.import_attach) {
 297                 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
 298                                                DMA_FROM_DEVICE);
 299                 if (ret)
 300                         goto unlock;
 301         }
 302
 303         for (i = 0; i < num_clips; i++) {
 304                 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
 305                                   clips[i].x2 - clips[i].x1,
 306                                   clips[i].y2 - clips[i].y1);
 307                 if (ret)
 308                         break;
 309         }
 310
 311         if (ufb->obj->base.import_attach) {
 312                 ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
 313                                              DMA_FROM_DEVICE);
 314         }
 315
 316  unlock:
 317         drm_modeset_unlock_all(fb->dev);
 318
 319         return ret;
 320 }
 321
 322 static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 323 {
 324         struct udl_framebuffer *ufb = to_udl_fb(fb);
 325
 326         if (ufb->obj)
 327                 drm_gem_object_put_unlocked(&ufb->obj->base);
 328
 329         drm_framebuffer_cleanup(fb);
 330         kfree(ufb);
 331 }
 332
 333 static const struct drm_framebuffer_funcs udlfb_funcs = {
 334         .destroy = udl_user_framebuffer_destroy,
 335         .dirty = udl_user_framebuffer_dirty,
 336 };
 337
 338
 339 static int
 340 udl_framebuffer_init(struct drm_device *dev,
 341                      struct udl_framebuffer *ufb,
 342                      const struct drm_mode_fb_cmd2 *mode_cmd,
 343                      struct udl_gem_object *obj)
 344 {
 345         int ret;
 346
 347         ufb->obj = obj;
 348         drm_helper_mode_fill_fb_struct(dev, &ufb->base, mode_cmd);
 349         ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
 350         return ret;
 351 }
 352
 353
 354 static int udlfb_create(struct drm_fb_helper *helper,
 355                         struct drm_fb_helper_surface_size *sizes)
 356 {
 357         struct udl_fbdev *ufbdev =
 358                 container_of(helper, struct udl_fbdev, helper);
 359         struct drm_device *dev = ufbdev->helper.dev;
 360         struct fb_info *info;
 361         struct drm_framebuffer *fb;
 362         struct drm_mode_fb_cmd2 mode_cmd;
 363         struct udl_gem_object *obj;
 364         uint32_t size;
 365         int ret = 0;
 366
 367         if (sizes->surface_bpp == 24)
 368                 sizes->surface_bpp = 32;
 369
 370         mode_cmd.width = sizes->surface_width;
 371         mode_cmd.height = sizes->surface_height;
 372         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 373
 374         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 375                                                           sizes->surface_depth);
 376
 377         size = mode_cmd.pitches[0] * mode_cmd.height;
 378         size = ALIGN(size, PAGE_SIZE);
 379
 380         obj = udl_gem_alloc_object(dev, size);
 381         if (!obj)
 382                 goto out;
 383
 384         ret = udl_gem_vmap(obj);
 385         if (ret) {
 386                 DRM_ERROR("failed to vmap fb\n");
 387                 goto out_gfree;
 388         }
 389
 390         info = drm_fb_helper_alloc_fbi(helper);
 391         if (IS_ERR(info)) {
 392                 ret = PTR_ERR(info);
 393                 goto out_gfree;
 394         }
 395         info->par = ufbdev;
 396
 397         ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
 398         if (ret)
 399                 goto out_gfree;
 400
 401         fb = &ufbdev->ufb.base;
 402
 403         ufbdev->helper.fb = fb;
 404
 405         strcpy(info->fix.id, "udldrmfb");
 406
 407         info->screen_base = ufbdev->ufb.obj->vmapping;
 408         info->fix.smem_len = size;
 409         info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
 410
 411         info->fbops = &udlfb_ops;
 412         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 413         drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
 414
 415         DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
 416                       fb->width, fb->height,
 417                       ufbdev->ufb.obj->vmapping);
 418
 419         return ret;
 420 out_gfree:
 421         drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
 422 out:
 423         return ret;
 424 }
 425
 426 static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
 427         .fb_probe = udlfb_create,
 428 };
 429
 430 static void udl_fbdev_destroy(struct drm_device *dev,
 431                               struct udl_fbdev *ufbdev)
 432 {
 433         drm_fb_helper_unregister_fbi(&ufbdev->helper);
 434         drm_fb_helper_fini(&ufbdev->helper);
 435         if (ufbdev->ufb.obj) {
 436                 drm_framebuffer_unregister_private(&ufbdev->ufb.base);
 437                 drm_framebuffer_cleanup(&ufbdev->ufb.base);
 438                 drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
 439         }
 440 }
 441
 442 int udl_fbdev_init(struct drm_device *dev)
 443 {
 444         struct udl_device *udl = dev->dev_private;
 445         int bpp_sel = fb_bpp;
 446         struct udl_fbdev *ufbdev;
 447         int ret;
 448
 449         ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
 450         if (!ufbdev)
 451                 return -ENOMEM;
 452
 453         udl->fbdev = ufbdev;
 454
 455         drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
 456
 457         ret = drm_fb_helper_init(dev, &ufbdev->helper, 1);
 458         if (ret)
 459                 goto free;
 460
 461         ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
 462         if (ret)
 463                 goto fini;
 464
 465         /* disable all the possible outputs/crtcs before entering KMS mode */
 466         drm_helper_disable_unused_functions(dev);
 467
 468         ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
 469         if (ret)
 470                 goto fini;
 471
 472         return 0;
 473
 474 fini:
 475         drm_fb_helper_fini(&ufbdev->helper);
 476 free:
 477         kfree(ufbdev);
 478         return ret;
 479 }
 480
 481 void udl_fbdev_cleanup(struct drm_device *dev)
 482 {
 483         struct udl_device *udl = dev->dev_private;
 484         if (!udl->fbdev)
 485                 return;
 486
 487         udl_fbdev_destroy(dev, udl->fbdev);
 488         kfree(udl->fbdev);
 489         udl->fbdev = NULL;
 490 }
 491
 492 void udl_fbdev_unplug(struct drm_device *dev)
 493 {
 494         struct udl_device *udl = dev->dev_private;
 495         struct udl_fbdev *ufbdev;
 496         if (!udl->fbdev)
 497                 return;
 498
 499         ufbdev = udl->fbdev;
 500         drm_fb_helper_unlink_fbi(&ufbdev->helper);
 501 }
 502
 503 struct drm_framebuffer *
 504 udl_fb_user_fb_create(struct drm_device *dev,
 505                    struct drm_file *file,
 506                    const struct drm_mode_fb_cmd2 *mode_cmd)
 507 {
 508         struct drm_gem_object *obj;
 509         struct udl_framebuffer *ufb;
 510         int ret;
 511         uint32_t size;
 512
 513         obj = drm_gem_object_lookup(file, mode_cmd->handles[0]);
 514         if (obj == NULL)
 515                 return ERR_PTR(-ENOENT);
 516
 517         size = mode_cmd->pitches[0] * mode_cmd->height;
 518         size = ALIGN(size, PAGE_SIZE);
 519
 520         if (size > obj->size) {
 521                 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
 522                 return ERR_PTR(-ENOMEM);
 523         }
 524
 525         ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
 526         if (ufb == NULL)
 527                 return ERR_PTR(-ENOMEM);
 528
 529         ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
 530         if (ret) {
 531                 kfree(ufb);
 532                 return ERR_PTR(-EINVAL);
 533         }
 534         return &ufb->base;
 535 }