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 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 = vma->vm_pgoff << PAGE_SHIFT;
 163         unsigned long page, pos;
 164
 165         if (offset + size > info->fix.smem_len)
 166                 return -EINVAL;
 167
 168         pos = (unsigned long)info->fix.smem_start + offset;
 169
 170         pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
 171                   pos, size);
 172
 173         /* We don't want the framebuffer to be mapped encrypted */
 174         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
 175
 176         while (size > 0) {
 177                 page = vmalloc_to_pfn((void *)pos);
 178                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 179                         return -EAGAIN;
 180
 181                 start += PAGE_SIZE;
 182                 pos += PAGE_SIZE;
 183                 if (size > PAGE_SIZE)
 184                         size -= PAGE_SIZE;
 185                 else
 186                         size = 0;
 187         }
 188
 189         /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
 190         return 0;
 191 }
 192
 193 /*
 194  * It's common for several clients to have framebuffer open simultaneously.
 195  * e.g. both fbcon and X. Makes things interesting.
 196  * Assumes caller is holding info->lock (for open and release at least)
 197  */
 198 static int udl_fb_open(struct fb_info *info, int user)
 199 {
 200         struct udl_fbdev *ufbdev = info->par;
 201         struct drm_device *dev = ufbdev->ufb.base.dev;
 202         struct udl_device *udl = dev->dev_private;
 203
 204         /* If the USB device is gone, we don't accept new opens */
 205         if (drm_dev_is_unplugged(udl->ddev))
 206                 return -ENODEV;
 207
 208         ufbdev->fb_count++;
 209
 210 #ifdef CONFIG_DRM_FBDEV_EMULATION
 211         if (fb_defio && (info->fbdefio == NULL)) {
 212                 /* enable defio at last moment if not disabled by client */
 213
 214                 struct fb_deferred_io *fbdefio;
 215
 216                 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
 217
 218                 if (fbdefio) {
 219                         fbdefio->delay = DL_DEFIO_WRITE_DELAY;
 220                         fbdefio->deferred_io = drm_fb_helper_deferred_io;
 221                 }
 222
 223                 info->fbdefio = fbdefio;
 224                 fb_deferred_io_init(info);
 225         }
 226 #endif
 227
 228         pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
 229                   info->node, user, info, ufbdev->fb_count);
 230
 231         return 0;
 232 }
 233
 234
 235 /*
 236  * Assumes caller is holding info->lock mutex (for open and release at least)
 237  */
 238 static int udl_fb_release(struct fb_info *info, int user)
 239 {
 240         struct udl_fbdev *ufbdev = info->par;
 241
 242         ufbdev->fb_count--;
 243
 244 #ifdef CONFIG_DRM_FBDEV_EMULATION
 245         if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
 246                 fb_deferred_io_cleanup(info);
 247                 kfree(info->fbdefio);
 248                 info->fbdefio = NULL;
 249                 info->fbops->fb_mmap = udl_fb_mmap;
 250         }
 251 #endif
 252
 253         pr_warn("released /dev/fb%d user=%d count=%d\n",
 254                 info->node, user, ufbdev->fb_count);
 255
 256         return 0;
 257 }
 258
 259 static struct fb_ops udlfb_ops = {
 260         .owner = THIS_MODULE,
 261         DRM_FB_HELPER_DEFAULT_OPS,
 262         .fb_fillrect = drm_fb_helper_sys_fillrect,
 263         .fb_copyarea = drm_fb_helper_sys_copyarea,
 264         .fb_imageblit = drm_fb_helper_sys_imageblit,
 265         .fb_mmap = udl_fb_mmap,
 266         .fb_open = udl_fb_open,
 267         .fb_release = udl_fb_release,
 268 };
 269
 270 static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
 271                                       struct drm_file *file,
 272                                       unsigned flags, unsigned color,
 273                                       struct drm_clip_rect *clips,
 274                                       unsigned num_clips)
 275 {
 276         struct udl_framebuffer *ufb = to_udl_fb(fb);
 277         int i;
 278         int ret = 0;
 279
 280         drm_modeset_lock_all(fb->dev);
 281
 282         if (!ufb->active_16)
 283                 goto unlock;
 284
 285         if (ufb->obj->base.import_attach) {
 286                 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
 287                                                DMA_FROM_DEVICE);
 288                 if (ret)
 289                         goto unlock;
 290         }
 291
 292         for (i = 0; i < num_clips; i++) {
 293                 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
 294                                   clips[i].x2 - clips[i].x1,
 295                                   clips[i].y2 - clips[i].y1);
 296                 if (ret)
 297                         break;
 298         }
 299
 300         if (ufb->obj->base.import_attach) {
 301                 ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
 302                                              DMA_FROM_DEVICE);
 303         }
 304
 305  unlock:
 306         drm_modeset_unlock_all(fb->dev);
 307
 308         return ret;
 309 }
 310
 311 static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 312 {
 313         struct udl_framebuffer *ufb = to_udl_fb(fb);
 314
 315         if (ufb->obj)
 316                 drm_gem_object_put_unlocked(&ufb->obj->base);
 317
 318         drm_framebuffer_cleanup(fb);
 319         kfree(ufb);
 320 }
 321
 322 static const struct drm_framebuffer_funcs udlfb_funcs = {
 323         .destroy = udl_user_framebuffer_destroy,
 324         .dirty = udl_user_framebuffer_dirty,
 325 };
 326
 327
 328 static int
 329 udl_framebuffer_init(struct drm_device *dev,
 330                      struct udl_framebuffer *ufb,
 331                      const struct drm_mode_fb_cmd2 *mode_cmd,
 332                      struct udl_gem_object *obj)
 333 {
 334         int ret;
 335
 336         ufb->obj = obj;
 337         drm_helper_mode_fill_fb_struct(dev, &ufb->base, mode_cmd);
 338         ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
 339         return ret;
 340 }
 341
 342
 343 static int udlfb_create(struct drm_fb_helper *helper,
 344                         struct drm_fb_helper_surface_size *sizes)
 345 {
 346         struct udl_fbdev *ufbdev =
 347                 container_of(helper, struct udl_fbdev, helper);
 348         struct drm_device *dev = ufbdev->helper.dev;
 349         struct fb_info *info;
 350         struct drm_framebuffer *fb;
 351         struct drm_mode_fb_cmd2 mode_cmd;
 352         struct udl_gem_object *obj;
 353         uint32_t size;
 354         int ret = 0;
 355
 356         if (sizes->surface_bpp == 24)
 357                 sizes->surface_bpp = 32;
 358
 359         mode_cmd.width = sizes->surface_width;
 360         mode_cmd.height = sizes->surface_height;
 361         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 362
 363         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 364                                                           sizes->surface_depth);
 365
 366         size = mode_cmd.pitches[0] * mode_cmd.height;
 367         size = ALIGN(size, PAGE_SIZE);
 368
 369         obj = udl_gem_alloc_object(dev, size);
 370         if (!obj)
 371                 goto out;
 372
 373         ret = udl_gem_vmap(obj);
 374         if (ret) {
 375                 DRM_ERROR("failed to vmap fb\n");
 376                 goto out_gfree;
 377         }
 378
 379         info = drm_fb_helper_alloc_fbi(helper);
 380         if (IS_ERR(info)) {
 381                 ret = PTR_ERR(info);
 382                 goto out_gfree;
 383         }
 384         info->par = ufbdev;
 385
 386         ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
 387         if (ret)
 388                 goto out_gfree;
 389
 390         fb = &ufbdev->ufb.base;
 391
 392         ufbdev->helper.fb = fb;
 393
 394         strcpy(info->fix.id, "udldrmfb");
 395
 396         info->screen_base = ufbdev->ufb.obj->vmapping;
 397         info->fix.smem_len = size;
 398         info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
 399
 400         info->fbops = &udlfb_ops;
 401         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 402         drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
 403
 404         DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
 405                       fb->width, fb->height,
 406                       ufbdev->ufb.obj->vmapping);
 407
 408         return ret;
 409 out_gfree:
 410         drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
 411 out:
 412         return ret;
 413 }
 414
 415 static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
 416         .fb_probe = udlfb_create,
 417 };
 418
 419 static void udl_fbdev_destroy(struct drm_device *dev,
 420                               struct udl_fbdev *ufbdev)
 421 {
 422         drm_fb_helper_unregister_fbi(&ufbdev->helper);
 423         drm_fb_helper_fini(&ufbdev->helper);
 424         drm_framebuffer_unregister_private(&ufbdev->ufb.base);
 425         drm_framebuffer_cleanup(&ufbdev->ufb.base);
 426         drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
 427 }
 428
 429 int udl_fbdev_init(struct drm_device *dev)
 430 {
 431         struct udl_device *udl = dev->dev_private;
 432         int bpp_sel = fb_bpp;
 433         struct udl_fbdev *ufbdev;
 434         int ret;
 435
 436         ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
 437         if (!ufbdev)
 438                 return -ENOMEM;
 439
 440         udl->fbdev = ufbdev;
 441
 442         drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
 443
 444         ret = drm_fb_helper_init(dev, &ufbdev->helper, 1);
 445         if (ret)
 446                 goto free;
 447
 448         ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
 449         if (ret)
 450                 goto fini;
 451
 452         /* disable all the possible outputs/crtcs before entering KMS mode */
 453         drm_helper_disable_unused_functions(dev);
 454
 455         ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
 456         if (ret)
 457                 goto fini;
 458
 459         return 0;
 460
 461 fini:
 462         drm_fb_helper_fini(&ufbdev->helper);
 463 free:
 464         kfree(ufbdev);
 465         return ret;
 466 }
 467
 468 void udl_fbdev_cleanup(struct drm_device *dev)
 469 {
 470         struct udl_device *udl = dev->dev_private;
 471         if (!udl->fbdev)
 472                 return;
 473
 474         udl_fbdev_destroy(dev, udl->fbdev);
 475         kfree(udl->fbdev);
 476         udl->fbdev = NULL;
 477 }
 478
 479 void udl_fbdev_unplug(struct drm_device *dev)
 480 {
 481         struct udl_device *udl = dev->dev_private;
 482         struct udl_fbdev *ufbdev;
 483         if (!udl->fbdev)
 484                 return;
 485
 486         ufbdev = udl->fbdev;
 487         drm_fb_helper_unlink_fbi(&ufbdev->helper);
 488 }
 489
 490 struct drm_framebuffer *
 491 udl_fb_user_fb_create(struct drm_device *dev,
 492                    struct drm_file *file,
 493                    const struct drm_mode_fb_cmd2 *mode_cmd)
 494 {
 495         struct drm_gem_object *obj;
 496         struct udl_framebuffer *ufb;
 497         int ret;
 498         uint32_t size;
 499
 500         obj = drm_gem_object_lookup(file, mode_cmd->handles[0]);
 501         if (obj == NULL)
 502                 return ERR_PTR(-ENOENT);
 503
 504         size = mode_cmd->pitches[0] * mode_cmd->height;
 505         size = ALIGN(size, PAGE_SIZE);
 506
 507         if (size > obj->size) {
 508                 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
 509                 return ERR_PTR(-ENOMEM);
 510         }
 511
 512         ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
 513         if (ufb == NULL)
 514                 return ERR_PTR(-ENOMEM);
 515
 516         ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
 517         if (ret) {
 518                 kfree(ufb);
 519                 return ERR_PTR(-EINVAL);
 520         }
 521         return &ufb->base;
 522 }