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(x-(a-1), 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.bits_per_pixel / 8);
  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;
 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*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_notice("mmap() framebuffer addr:%lu size:%lu\n",
 178                   pos, size);
 179
 180         while (size > 0) {
 181                 page = vmalloc_to_pfn((void *)pos);
 182                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 183                         return -EAGAIN;
 184
 185                 start += PAGE_SIZE;
 186                 pos += PAGE_SIZE;
 187                 if (size > PAGE_SIZE)
 188                         size -= PAGE_SIZE;
 189                 else
 190                         size = 0;
 191         }
 192
 193         /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
 194         return 0;
 195 }
 196
 197 /*
 198  * It's common for several clients to have framebuffer open simultaneously.
 199  * e.g. both fbcon and X. Makes things interesting.
 200  * Assumes caller is holding info->lock (for open and release at least)
 201  */
 202 static int udl_fb_open(struct fb_info *info, int user)
 203 {
 204         struct udl_fbdev *ufbdev = info->par;
 205         struct drm_device *dev = ufbdev->ufb.base.dev;
 206         struct udl_device *udl = dev->dev_private;
 207
 208         /* If the USB device is gone, we don't accept new opens */
 209         if (drm_device_is_unplugged(udl->ddev))
 210                 return -ENODEV;
 211
 212         ufbdev->fb_count++;
 213
 214 #ifdef CONFIG_DRM_FBDEV_EMULATION
 215         if (fb_defio && (info->fbdefio == NULL)) {
 216                 /* enable defio at last moment if not disabled by client */
 217
 218                 struct fb_deferred_io *fbdefio;
 219
 220                 fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
 221
 222                 if (fbdefio) {
 223                         fbdefio->delay = DL_DEFIO_WRITE_DELAY;
 224                         fbdefio->deferred_io = drm_fb_helper_deferred_io;
 225                 }
 226
 227                 info->fbdefio = fbdefio;
 228                 fb_deferred_io_init(info);
 229         }
 230 #endif
 231
 232         pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
 233                   info->node, user, info, ufbdev->fb_count);
 234
 235         return 0;
 236 }
 237
 238
 239 /*
 240  * Assumes caller is holding info->lock mutex (for open and release at least)
 241  */
 242 static int udl_fb_release(struct fb_info *info, int user)
 243 {
 244         struct udl_fbdev *ufbdev = info->par;
 245
 246         ufbdev->fb_count--;
 247
 248 #ifdef CONFIG_DRM_FBDEV_EMULATION
 249         if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
 250                 fb_deferred_io_cleanup(info);
 251                 kfree(info->fbdefio);
 252                 info->fbdefio = NULL;
 253                 info->fbops->fb_mmap = udl_fb_mmap;
 254         }
 255 #endif
 256
 257         pr_warn("released /dev/fb%d user=%d count=%d\n",
 258                 info->node, user, ufbdev->fb_count);
 259
 260         return 0;
 261 }
 262
 263 static struct fb_ops udlfb_ops = {
 264         .owner = THIS_MODULE,
 265         .fb_check_var = drm_fb_helper_check_var,
 266         .fb_set_par = drm_fb_helper_set_par,
 267         .fb_fillrect = drm_fb_helper_sys_fillrect,
 268         .fb_copyarea = drm_fb_helper_sys_copyarea,
 269         .fb_imageblit = drm_fb_helper_sys_imageblit,
 270         .fb_pan_display = drm_fb_helper_pan_display,
 271         .fb_blank = drm_fb_helper_blank,
 272         .fb_setcmap = drm_fb_helper_setcmap,
 273         .fb_debug_enter = drm_fb_helper_debug_enter,
 274         .fb_debug_leave = drm_fb_helper_debug_leave,
 275         .fb_mmap = udl_fb_mmap,
 276         .fb_open = udl_fb_open,
 277         .fb_release = udl_fb_release,
 278 };
 279
 280 static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
 281                                       struct drm_file *file,
 282                                       unsigned flags, unsigned color,
 283                                       struct drm_clip_rect *clips,
 284                                       unsigned num_clips)
 285 {
 286         struct udl_framebuffer *ufb = to_udl_fb(fb);
 287         int i;
 288         int ret = 0;
 289
 290         drm_modeset_lock_all(fb->dev);
 291
 292         if (!ufb->active_16)
 293                 goto unlock;
 294
 295         if (ufb->obj->base.import_attach) {
 296                 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
 297                                                DMA_FROM_DEVICE);
 298                 if (ret)
 299                         goto unlock;
 300         }
 301
 302         for (i = 0; i < num_clips; i++) {
 303                 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
 304                                   clips[i].x2 - clips[i].x1,
 305                                   clips[i].y2 - clips[i].y1);
 306                 if (ret)
 307                         break;
 308         }
 309
 310         if (ufb->obj->base.import_attach) {
 311                 ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
 312                                              DMA_FROM_DEVICE);
 313         }
 314
 315  unlock:
 316         drm_modeset_unlock_all(fb->dev);
 317
 318         return ret;
 319 }
 320
 321 static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 322 {
 323         struct udl_framebuffer *ufb = to_udl_fb(fb);
 324
 325         if (ufb->obj)
 326                 drm_gem_object_unreference_unlocked(&ufb->obj->base);
 327
 328         drm_framebuffer_cleanup(fb);
 329         kfree(ufb);
 330 }
 331
 332 static const struct drm_framebuffer_funcs udlfb_funcs = {
 333         .destroy = udl_user_framebuffer_destroy,
 334         .dirty = udl_user_framebuffer_dirty,
 335 };
 336
 337
 338 static int
 339 udl_framebuffer_init(struct drm_device *dev,
 340                      struct udl_framebuffer *ufb,
 341                      const struct drm_mode_fb_cmd2 *mode_cmd,
 342                      struct udl_gem_object *obj)
 343 {
 344         int ret;
 345
 346         ufb->obj = obj;
 347         drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
 348         ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
 349         return ret;
 350 }
 351
 352
 353 static int udlfb_create(struct drm_fb_helper *helper,
 354                         struct drm_fb_helper_surface_size *sizes)
 355 {
 356         struct udl_fbdev *ufbdev =
 357                 container_of(helper, struct udl_fbdev, helper);
 358         struct drm_device *dev = ufbdev->helper.dev;
 359         struct fb_info *info;
 360         struct drm_framebuffer *fb;
 361         struct drm_mode_fb_cmd2 mode_cmd;
 362         struct udl_gem_object *obj;
 363         uint32_t size;
 364         int ret = 0;
 365
 366         if (sizes->surface_bpp == 24)
 367                 sizes->surface_bpp = 32;
 368
 369         mode_cmd.width = sizes->surface_width;
 370         mode_cmd.height = sizes->surface_height;
 371         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 372
 373         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 374                                                           sizes->surface_depth);
 375
 376         size = mode_cmd.pitches[0] * mode_cmd.height;
 377         size = ALIGN(size, PAGE_SIZE);
 378
 379         obj = udl_gem_alloc_object(dev, size);
 380         if (!obj)
 381                 goto out;
 382
 383         ret = udl_gem_vmap(obj);
 384         if (ret) {
 385                 DRM_ERROR("failed to vmap fb\n");
 386                 goto out_gfree;
 387         }
 388
 389         info = drm_fb_helper_alloc_fbi(helper);
 390         if (IS_ERR(info)) {
 391                 ret = PTR_ERR(info);
 392                 goto out_gfree;
 393         }
 394         info->par = ufbdev;
 395
 396         ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
 397         if (ret)
 398                 goto out_destroy_fbi;
 399
 400         fb = &ufbdev->ufb.base;
 401
 402         ufbdev->helper.fb = fb;
 403
 404         strcpy(info->fix.id, "udldrmfb");
 405
 406         info->screen_base = ufbdev->ufb.obj->vmapping;
 407         info->fix.smem_len = size;
 408         info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
 409
 410         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 411         info->fbops = &udlfb_ops;
 412         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->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_destroy_fbi:
 421         drm_fb_helper_release_fbi(helper);
 422 out_gfree:
 423         drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
 424 out:
 425         return ret;
 426 }
 427
 428 static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
 429         .fb_probe = udlfb_create,
 430 };
 431
 432 static void udl_fbdev_destroy(struct drm_device *dev,
 433                               struct udl_fbdev *ufbdev)
 434 {
 435         drm_fb_helper_unregister_fbi(&ufbdev->helper);
 436         drm_fb_helper_release_fbi(&ufbdev->helper);
 437         drm_fb_helper_fini(&ufbdev->helper);
 438         drm_framebuffer_unregister_private(&ufbdev->ufb.base);
 439         drm_framebuffer_cleanup(&ufbdev->ufb.base);
 440         drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
 441 }
 442
 443 int udl_fbdev_init(struct drm_device *dev)
 444 {
 445         struct udl_device *udl = dev->dev_private;
 446         int bpp_sel = fb_bpp;
 447         struct udl_fbdev *ufbdev;
 448         int ret;
 449
 450         ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
 451         if (!ufbdev)
 452                 return -ENOMEM;
 453
 454         udl->fbdev = ufbdev;
 455
 456         drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
 457
 458         ret = drm_fb_helper_init(dev, &ufbdev->helper,
 459                                  1, 1);
 460         if (ret)
 461                 goto free;
 462
 463         ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
 464         if (ret)
 465                 goto fini;
 466
 467         /* disable all the possible outputs/crtcs before entering KMS mode */
 468         drm_helper_disable_unused_functions(dev);
 469
 470         ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
 471         if (ret)
 472                 goto fini;
 473
 474         return 0;
 475
 476 fini:
 477         drm_fb_helper_fini(&ufbdev->helper);
 478 free:
 479         kfree(ufbdev);
 480         return ret;
 481 }
 482
 483 void udl_fbdev_cleanup(struct drm_device *dev)
 484 {
 485         struct udl_device *udl = dev->dev_private;
 486         if (!udl->fbdev)
 487                 return;
 488
 489         udl_fbdev_destroy(dev, udl->fbdev);
 490         kfree(udl->fbdev);
 491         udl->fbdev = NULL;
 492 }
 493
 494 void udl_fbdev_unplug(struct drm_device *dev)
 495 {
 496         struct udl_device *udl = dev->dev_private;
 497         struct udl_fbdev *ufbdev;
 498         if (!udl->fbdev)
 499                 return;
 500
 501         ufbdev = udl->fbdev;
 502         drm_fb_helper_unlink_fbi(&ufbdev->helper);
 503 }
 504
 505 struct drm_framebuffer *
 506 udl_fb_user_fb_create(struct drm_device *dev,
 507                    struct drm_file *file,
 508                    const struct drm_mode_fb_cmd2 *mode_cmd)
 509 {
 510         struct drm_gem_object *obj;
 511         struct udl_framebuffer *ufb;
 512         int ret;
 513         uint32_t size;
 514
 515         obj = drm_gem_object_lookup(file, mode_cmd->handles[0]);
 516         if (obj == NULL)
 517                 return ERR_PTR(-ENOENT);
 518
 519         size = mode_cmd->pitches[0] * mode_cmd->height;
 520         size = ALIGN(size, PAGE_SIZE);
 521
 522         if (size > obj->size) {
 523                 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
 524                 return ERR_PTR(-ENOMEM);
 525         }
 526
 527         ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
 528         if (ufb == NULL)
 529                 return ERR_PTR(-ENOMEM);
 530
 531         ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
 532         if (ret) {
 533                 kfree(ufb);
 534                 return ERR_PTR(-EINVAL);
 535         }
 536         return &ufb->base;
 537 }