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 <[email protected]>
   6  * Copyright (C) 2009 Jaya Kumar <[email protected]>
   7  * Copyright (C) 2009 Bernie Thompson <[email protected]>
   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 bpp = fb->base.format->cpp[0];
  94
  95         if (!fb->active_16)
  96                 return 0;
  97
  98         if (!fb->obj->vmapping) {
  99                 ret = udl_gem_vmap(fb->obj);
 100                 if (ret == -ENOMEM) {
 101                         DRM_ERROR("failed to vmap fb\n");
 102                         return 0;
 103                 }
 104                 if (!fb->obj->vmapping) {
 105                         DRM_ERROR("failed to vmapping\n");
 106                         return 0;
 107                 }
 108         }
 109
 110         aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
 111         width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
 112         x = aligned_x;
 113
 114         if ((width <= 0) ||
 115             (x + width > fb->base.width) ||
 116             (y + height > fb->base.height))
 117                 return -EINVAL;
 118
 119         start_cycles = get_cycles();
 120
 121         urb = udl_get_urb(dev);
 122         if (!urb)
 123                 return 0;
 124         cmd = urb->transfer_buffer;
 125
 126         for (i = y; i < y + height ; i++) {
 127                 const int line_offset = fb->base.pitches[0] * i;
 128                 const int byte_offset = line_offset + (x * bpp);
 129                 const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
 130                 if (udl_render_hline(dev, bpp, &urb,
 131                                      (char *) fb->obj->vmapping,
 132                                      &cmd, byte_offset, dev_byte_offset,
 133                                      width * bpp,
 134                                      &bytes_identical, &bytes_sent))
 135                         goto error;
 136         }
 137
 138         if (cmd > (char *) urb->transfer_buffer) {
 139                 /* Send partial buffer remaining before exiting */
 140                 int len = cmd - (char *) urb->transfer_buffer;
 141                 ret = udl_submit_urb(dev, urb, len);
 142                 bytes_sent += len;
 143         } else
 144                 udl_urb_completion(urb);
 145
 146 error:
 147         atomic_add(bytes_sent, &udl->bytes_sent);
 148         atomic_add(bytes_identical, &udl->bytes_identical);
 149         atomic_add(width*height*bpp, &udl->bytes_rendered);
 150         end_cycles = get_cycles();
 151         atomic_add(((unsigned int) ((end_cycles - start_cycles)
 152                     >> 10)), /* Kcycles */
 153                    &udl->cpu_kcycles_used);
 154
 155         return 0;
 156 }
 157
 158 static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 159 {
 160         unsigned long start = vma->vm_start;
 161         unsigned long size = vma->vm_end - vma->vm_start;
 162         unsigned long offset;
 163         unsigned long page, pos;
 164
 165         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 166                 return -EINVAL;
 167
 168         offset = vma->vm_pgoff << PAGE_SHIFT;
 169
 170         if (offset > info->fix.smem_len || size > info->fix.smem_len - offset)
 171                 return -EINVAL;
 172
 173         pos = (unsigned long)info->fix.smem_start + offset;
 174
 175         pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
 176                   pos, size);
 177
 178         /* We don't want the framebuffer to be mapped encrypted */
 179         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
 180
 181         while (size > 0) {
 182                 page = vmalloc_to_pfn((void *)pos);
 183                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 184                         return -EAGAIN;
 185
 186                 start += PAGE_SIZE;
 187                 pos += PAGE_SIZE;
 188                 if (size > PAGE_SIZE)
 189                         size -= PAGE_SIZE;
 190                 else
 191                         size = 0;
 192         }
 193
 194         /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
 195         return 0;
 196 }
 197
 198 /*
 199  * It's common for several clients to have framebuffer open simultaneously.
 200  * e.g. both fbcon and X. Makes things interesting.
 201  * Assumes caller is holding info->lock (for open and release at least)
 202  */
 203 static int udl_fb_open(struct fb_info *info, int user)
 204 {
 205         struct udl_fbdev *ufbdev = info->par;
 206         struct drm_device *dev = ufbdev->ufb.base.dev;
 207         struct udl_device *udl = dev->dev_private;
 208
 209         /* If the USB device is gone, we don't accept new opens */
 210         if (drm_dev_is_unplugged(udl->ddev))
 211                 return -ENODEV;
 212
 213         ufbdev->fb_count++;
 214
 215 #ifdef CONFIG_DRM_FBDEV_EMULATION
 216         if (fb_defio && (info->fbdefio == NULL)) {
 217                 /* enable defio at last moment if not disabled by client */
 218
 219                 struct fb_deferred_io *fbdefio;
 220
 221                 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
 222
 223                 if (fbdefio) {
 224                         fbdefio->delay = DL_DEFIO_WRITE_DELAY;
 225                         fbdefio->deferred_io = drm_fb_helper_deferred_io;
 226                 }
 227
 228                 info->fbdefio = fbdefio;
 229                 fb_deferred_io_init(info);
 230         }
 231 #endif
 232
 233         pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
 234                   info->node, user, info, ufbdev->fb_count);
 235
 236         return 0;
 237 }
 238
 239
 240 /*
 241  * Assumes caller is holding info->lock mutex (for open and release at least)
 242  */
 243 static int udl_fb_release(struct fb_info *info, int user)
 244 {
 245         struct udl_fbdev *ufbdev = info->par;
 246
 247         ufbdev->fb_count--;
 248
 249 #ifdef CONFIG_DRM_FBDEV_EMULATION
 250         if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
 251                 fb_deferred_io_cleanup(info);
 252                 kfree(info->fbdefio);
 253                 info->fbdefio = NULL;
 254                 info->fbops->fb_mmap = udl_fb_mmap;
 255         }
 256 #endif
 257
 258         pr_warn("released /dev/fb%d user=%d count=%d\n",
 259                 info->node, user, ufbdev->fb_count);
 260
 261         return 0;
 262 }
 263
 264 static struct fb_ops udlfb_ops = {
 265         .owner = THIS_MODULE,
 266         DRM_FB_HELPER_DEFAULT_OPS,
 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_mmap = udl_fb_mmap,
 271         .fb_open = udl_fb_open,
 272         .fb_release = udl_fb_release,
 273 };
 274
 275 static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
 276                                       struct drm_file *file,
 277                                       unsigned flags, unsigned color,
 278                                       struct drm_clip_rect *clips,
 279                                       unsigned num_clips)
 280 {
 281         struct udl_framebuffer *ufb = to_udl_fb(fb);
 282         int i;
 283         int ret = 0;
 284
 285         drm_modeset_lock_all(fb->dev);
 286
 287         if (!ufb->active_16)
 288                 goto unlock;
 289
 290         if (ufb->obj->base.import_attach) {
 291                 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
 292                                                DMA_FROM_DEVICE);
 293                 if (ret)
 294                         goto unlock;
 295         }
 296
 297         for (i = 0; i < num_clips; i++) {
 298                 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
 299                                   clips[i].x2 - clips[i].x1,
 300                                   clips[i].y2 - clips[i].y1);
 301                 if (ret)
 302                         break;
 303         }
 304
 305         if (ufb->obj->base.import_attach) {
 306                 ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
 307                                              DMA_FROM_DEVICE);
 308         }
 309
 310  unlock:
 311         drm_modeset_unlock_all(fb->dev);
 312
 313         return ret;
 314 }
 315
 316 static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 317 {
 318         struct udl_framebuffer *ufb = to_udl_fb(fb);
 319
 320         if (ufb->obj)
 321                 drm_gem_object_put_unlocked(&ufb->obj->base);
 322
 323         drm_framebuffer_cleanup(fb);
 324         kfree(ufb);
 325 }
 326
 327 static const struct drm_framebuffer_funcs udlfb_funcs = {
 328         .destroy = udl_user_framebuffer_destroy,
 329         .dirty = udl_user_framebuffer_dirty,
 330 };
 331
 332
 333 static int
 334 udl_framebuffer_init(struct drm_device *dev,
 335                      struct udl_framebuffer *ufb,
 336                      const struct drm_mode_fb_cmd2 *mode_cmd,
 337                      struct udl_gem_object *obj)
 338 {
 339         int ret;
 340
 341         ufb->obj = obj;
 342         drm_helper_mode_fill_fb_struct(dev, &ufb->base, mode_cmd);
 343         ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
 344         return ret;
 345 }
 346
 347
 348 static int udlfb_create(struct drm_fb_helper *helper,
 349                         struct drm_fb_helper_surface_size *sizes)
 350 {
 351         struct udl_fbdev *ufbdev =
 352                 container_of(helper, struct udl_fbdev, helper);
 353         struct drm_device *dev = ufbdev->helper.dev;
 354         struct fb_info *info;
 355         struct drm_framebuffer *fb;
 356         struct drm_mode_fb_cmd2 mode_cmd;
 357         struct udl_gem_object *obj;
 358         uint32_t size;
 359         int ret = 0;
 360
 361         if (sizes->surface_bpp == 24)
 362                 sizes->surface_bpp = 32;
 363
 364         mode_cmd.width = sizes->surface_width;
 365         mode_cmd.height = sizes->surface_height;
 366         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 367
 368         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 369                                                           sizes->surface_depth);
 370
 371         size = mode_cmd.pitches[0] * mode_cmd.height;
 372         size = ALIGN(size, PAGE_SIZE);
 373
 374         obj = udl_gem_alloc_object(dev, size);
 375         if (!obj)
 376                 goto out;
 377
 378         ret = udl_gem_vmap(obj);
 379         if (ret) {
 380                 DRM_ERROR("failed to vmap fb\n");
 381                 goto out_gfree;
 382         }
 383
 384         info = drm_fb_helper_alloc_fbi(helper);
 385         if (IS_ERR(info)) {
 386                 ret = PTR_ERR(info);
 387                 goto out_gfree;
 388         }
 389         info->par = ufbdev;
 390
 391         ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
 392         if (ret)
 393                 goto out_gfree;
 394
 395         fb = &ufbdev->ufb.base;
 396
 397         ufbdev->helper.fb = fb;
 398
 399         strcpy(info->fix.id, "udldrmfb");
 400
 401         info->screen_base = ufbdev->ufb.obj->vmapping;
 402         info->fix.smem_len = size;
 403         info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
 404
 405         info->fbops = &udlfb_ops;
 406         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 407         drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
 408
 409         DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
 410                       fb->width, fb->height,
 411                       ufbdev->ufb.obj->vmapping);
 412
 413         return ret;
 414 out_gfree:
 415         drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
 416 out:
 417         return ret;
 418 }
 419
 420 static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
 421         .fb_probe = udlfb_create,
 422 };
 423
 424 static void udl_fbdev_destroy(struct drm_device *dev,
 425                               struct udl_fbdev *ufbdev)
 426 {
 427         drm_fb_helper_unregister_fbi(&ufbdev->helper);
 428         drm_fb_helper_fini(&ufbdev->helper);
 429         drm_framebuffer_unregister_private(&ufbdev->ufb.base);
 430         drm_framebuffer_cleanup(&ufbdev->ufb.base);
 431         drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
 432 }
 433
 434 int udl_fbdev_init(struct drm_device *dev)
 435 {
 436         struct udl_device *udl = dev->dev_private;
 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 = dev->dev_private;
 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 = dev->dev_private;
 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 }