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