gralloc_drm_kms.c

   1 /*
   2  * Copyright (C) 2010-2011 Chia-I Wu <olvaffe@gmail.com>
   3  * Copyright (C) 2010-2011 LunarG Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included
  13  * in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #define LOG_TAG "GRALLOC-KMS"
  25
  26 #include <cutils/properties.h>
  27 #include <cutils/log.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <signal.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include "gralloc_drm.h"
  34 #include "gralloc_drm_priv.h"
  35
  36 /*
  37  * Return true if a bo needs fb.
  38  */
  39 int gralloc_drm_bo_need_fb(const struct gralloc_drm_bo_t *bo)
  40 {
  41         return ((bo->handle->usage & GRALLOC_USAGE_HW_FB) &&
  42                 bo->drm->swap_mode != DRM_SWAP_COPY);
  43 }
  44
  45 /*
  46  * Add a fb object for a bo.
  47  */
  48 int gralloc_drm_bo_add_fb(struct gralloc_drm_bo_t *bo)
  49 {
  50         uint8_t bpp;
  51
  52         if (bo->fb_id)
  53                 return 0;
  54
  55         bpp = gralloc_drm_get_bpp(bo->handle->format) * 8;
  56
  57         return drmModeAddFB(bo->drm->fd,
  58                         bo->handle->width, bo->handle->height, bpp, bpp,
  59                         bo->handle->stride, bo->fb_handle,
  60                         (uint32_t *) &bo->fb_id);
  61 }
  62
  63 /*
  64  * Remove a fb object for a bo.
  65  */
  66 void gralloc_drm_bo_rm_fb(struct gralloc_drm_bo_t *bo)
  67 {
  68         if (bo->fb_id) {
  69                 drmModeRmFB(bo->drm->fd, bo->fb_id);
  70                 bo->fb_id = 0;
  71         }
  72 }
  73
  74 /*
  75  * Program CRTC.
  76  */
  77 static int drm_kms_set_crtc(struct gralloc_drm_t *drm, int fb_id)
  78 {
  79         int ret;
  80
  81         ret = drmModeSetCrtc(drm->fd, drm->crtc_id, fb_id,
  82                         0, 0, &drm->connector_id, 1, &drm->mode);
  83         if (ret) {
  84                 LOGE("failed to set crtc");
  85                 return ret;
  86         }
  87
  88 #ifdef DRM_MODE_FEATURE_DIRTYFB
  89         if (drm->mode_dirty_fb)
  90                 ret = drmModeDirtyFB(drm->fd, fb_id, &drm->clip, 1);
  91 #endif
  92
  93         return ret;
  94 }
  95
  96 /*
  97  * Callback for a page flip event.
  98  */
  99 static void page_flip_handler(int fd, unsigned int sequence,
 100                 unsigned int tv_sec, unsigned int tv_usec,
 101                 void *user_data)
 102 {
 103         struct gralloc_drm_t *drm = (struct gralloc_drm_t *) user_data;
 104
 105         /* ack the last scheduled flip */
 106         drm->current_front = drm->next_front;
 107         drm->next_front = NULL;
 108 }
 109
 110 /*
 111  * Schedule a page flip.
 112  */
 113 static int drm_kms_page_flip(struct gralloc_drm_t *drm,
 114                 struct gralloc_drm_bo_t *bo)
 115 {
 116         int ret;
 117
 118         /* there is another flip pending */
 119         while (drm->next_front) {
 120                 drm->waiting_flip = 1;
 121                 drmHandleEvent(drm->fd, &drm->evctx);
 122                 drm->waiting_flip = 0;
 123                 if (drm->next_front) {
 124                         /* record an error and break */
 125                         LOGE("drmHandleEvent returned without flipping");
 126                         drm->current_front = drm->next_front;
 127                         drm->next_front = NULL;
 128                 }
 129         }
 130
 131         if (!bo)
 132                 return 0;
 133
 134         ret = drmModePageFlip(drm->fd, drm->crtc_id, bo->fb_id,
 135                         DRM_MODE_PAGE_FLIP_EVENT, (void *) drm);
 136         if (ret)
 137                 LOGE("failed to perform page flip");
 138         else
 139                 drm->next_front = bo;
 140
 141         return ret;
 142 }
 143
 144 /*
 145  * Wait for the next post.
 146  */
 147 static void drm_kms_wait_for_post(struct gralloc_drm_t *drm, int flip)
 148 {
 149         unsigned int current, target;
 150         drmVBlank vbl;
 151         int ret;
 152
 153         flip = !!flip;
 154
 155         memset(&vbl, 0, sizeof(vbl));
 156         vbl.request.type = DRM_VBLANK_RELATIVE;
 157         if (drm->vblank_secondary)
 158                 vbl.request.type |= DRM_VBLANK_SECONDARY;
 159         vbl.request.sequence = 0;
 160
 161         /* get the current vblank */
 162         ret = drmWaitVBlank(drm->fd, &vbl);
 163         if (ret) {
 164                 LOGW("failed to get vblank");
 165                 return;
 166         }
 167
 168         current = vbl.reply.sequence;
 169         if (drm->first_post)
 170                 target = current;
 171         else
 172                 target = drm->last_swap + drm->swap_interval - flip;
 173
 174         /* wait for vblank */
 175         if (current < target || !flip) {
 176                 memset(&vbl, 0, sizeof(vbl));
 177                 vbl.request.type = DRM_VBLANK_ABSOLUTE;
 178                 if (drm->vblank_secondary)
 179                         vbl.request.type |= DRM_VBLANK_SECONDARY;
 180                 if (!flip) {
 181                         vbl.request.type |= DRM_VBLANK_NEXTONMISS;
 182                         if (target < current)
 183                                 target = current;
 184                 }
 185
 186                 vbl.request.sequence = target;
 187
 188                 ret = drmWaitVBlank(drm->fd, &vbl);
 189                 if (ret) {
 190                         LOGW("failed to wait vblank");
 191                         return;
 192                 }
 193         }
 194
 195         drm->last_swap = vbl.reply.sequence + flip;
 196 }
 197
 198 /*
 199  * Post a bo.  This is not thread-safe.
 200  */
 201 int gralloc_drm_bo_post(struct gralloc_drm_bo_t *bo)
 202 {
 203         struct gralloc_drm_t *drm = bo->drm;
 204         int ret;
 205
 206         if (!bo->fb_id && drm->swap_mode != DRM_SWAP_COPY) {
 207                 LOGE("unable to post bo %p without fb", bo);
 208                 return -EINVAL;
 209         }
 210
 211         /* TODO spawn a thread to avoid waiting and race */
 212
 213         if (drm->first_post) {
 214                 if (drm->swap_mode == DRM_SWAP_COPY) {
 215                         struct gralloc_drm_bo_t *dst;
 216
 217                         dst = (drm->next_front) ?
 218                                 drm->next_front :
 219                                 drm->current_front;
 220                         drm->drv->copy(drm->drv, dst, bo, 0, 0,
 221                                         bo->handle->width,
 222                                         bo->handle->height);
 223                         bo = dst;
 224                 }
 225
 226                 drm_kms_wait_for_post(drm, 0);
 227                 ret = drm_kms_set_crtc(drm, bo->fb_id);
 228                 if (!ret) {
 229                         drm->first_post = 0;
 230                         drm->current_front = bo;
 231                         if (drm->next_front == bo)
 232                                 drm->next_front = NULL;
 233                 }
 234
 235                 return ret;
 236         }
 237
 238         switch (drm->swap_mode) {
 239         case DRM_SWAP_FLIP:
 240                 if (drm->swap_interval > 1)
 241                         drm_kms_wait_for_post(drm, 1);
 242                 ret = drm_kms_page_flip(drm, bo);
 243                 if (drm->next_front) {
 244                         /*
 245                          * wait if the driver says so or the current front
 246                          * will be written by CPU
 247                          */
 248                         if (drm->mode_sync_flip ||
 249                             (drm->current_front->handle->usage &
 250                              GRALLOC_USAGE_SW_WRITE_MASK))
 251                                 drm_kms_page_flip(drm, NULL);
 252                 }
 253                 break;
 254         case DRM_SWAP_COPY:
 255                 drm_kms_wait_for_post(drm, 0);
 256                 drm->drv->copy(drm->drv, drm->current_front,
 257                                 bo, 0, 0,
 258                                 bo->handle->width,
 259                                 bo->handle->height);
 260                 ret = 0;
 261                 break;
 262         case DRM_SWAP_SETCRTC:
 263                 drm_kms_wait_for_post(drm, 0);
 264                 ret = drm_kms_set_crtc(drm, bo->fb_id);
 265                 drm->current_front = bo;
 266                 break;
 267         default:
 268                 /* no-op */
 269                 ret = 0;
 270                 break;
 271         }
 272
 273         return ret;
 274 }
 275
 276 static struct gralloc_drm_t *drm_singleton;
 277
 278 static void on_signal(int sig)
 279 {
 280    struct sigaction act;
 281
 282    /* wait the pending flip */
 283    if (drm_singleton && drm_singleton->next_front) {
 284       /* there is race, but this function is hacky enough to ignore that */
 285       if (drm_singleton->waiting_flip)
 286          usleep(100 * 1000); /* 100ms */
 287       else
 288          drm_kms_page_flip(drm_singleton, NULL);
 289    }
 290
 291    exit(-1);
 292 }
 293
 294 static void drm_kms_init_features(struct gralloc_drm_t *drm)
 295 {
 296         const char *swap_mode;
 297
 298         /* call to the driver here, after KMS has been initialized */
 299         drm->drv->init_kms_features(drm->drv, drm);
 300
 301         if (drm->swap_mode == DRM_SWAP_FLIP) {
 302                 struct sigaction act;
 303
 304                 memset(&drm->evctx, 0, sizeof(drm->evctx));
 305                 drm->evctx.version = DRM_EVENT_CONTEXT_VERSION;
 306                 drm->evctx.page_flip_handler = page_flip_handler;
 307
 308                 /*
 309                  * XXX GPU tends to freeze if the program is terminiated with a
 310                  * flip pending.  What is the right way to handle the
 311                  * situation?
 312                  */
 313                 sigemptyset(&act.sa_mask);
 314                 act.sa_handler = on_signal;
 315                 act.sa_flags = 0;
 316                 sigaction(SIGINT, &act, NULL);
 317                 sigaction(SIGTERM, &act, NULL);
 318
 319                 drm_singleton = drm;
 320         }
 321         else if (drm->swap_mode == DRM_SWAP_COPY) {
 322                 struct gralloc_drm_bo_t *front;
 323                 int stride;
 324
 325                 /* create the real front buffer */
 326                 front = gralloc_drm_bo_create(drm,
 327                                               drm->mode.hdisplay,
 328                                               drm->mode.vdisplay,
 329                                               drm->fb_format,
 330                                               GRALLOC_USAGE_HW_FB);
 331                 if (front && gralloc_drm_bo_add_fb(front)) {
 332                         gralloc_drm_bo_destroy(front);
 333                         front = NULL;
 334                 }
 335
 336                 /* abuse next_front */
 337                 if (front)
 338                         drm->next_front = front;
 339                 else
 340                         drm->swap_mode = DRM_SWAP_SETCRTC;
 341         }
 342
 343         switch (drm->swap_mode) {
 344         case DRM_SWAP_FLIP:
 345                 swap_mode = "flip";
 346                 break;
 347         case DRM_SWAP_COPY:
 348                 swap_mode = "copy";
 349                 break;
 350         case DRM_SWAP_SETCRTC:
 351                 swap_mode = "set-crtc";
 352                 break;
 353         default:
 354                 swap_mode = "no-op";
 355                 break;
 356         }
 357
 358         LOGD("will use %s for fb posting", swap_mode);
 359 }
 360
 361 static drmModeModeInfoPtr find_mode(drmModeConnectorPtr connector, int *bpp)
 362 {
 363         char value[PROPERTY_VALUE_MAX];
 364         drmModeModeInfoPtr mode;
 365         int dist, i;
 366         int xres = 0, yres = 0;
 367
 368         if (property_get("debug.drm.mode", value, NULL)) {
 369                 char *p = value, *end;
 370
 371                 /* parse <xres>x<yres>[@<bpp>] */
 372                 if (sscanf(value, "%dx%d@%d", &xres, &yres, bpp) != 3) {
 373                         *bpp = 0;
 374                         if (sscanf(value, "%dx%d", &xres, &yres) != 2)
 375                                 xres = yres = 0;
 376                 }
 377         }
 378         else {
 379                 *bpp = 0;
 380         }
 381
 382         mode = NULL;
 383         dist = INT_MAX;
 384         for (i = 0; i < connector->count_modes; i++) {
 385                 drmModeModeInfoPtr m = &connector->modes[i];
 386                 int tmp;
 387
 388                 if (xres && yres) {
 389                         tmp = (m->hdisplay - xres) * (m->hdisplay - xres) +
 390                                 (m->vdisplay - yres) * (m->vdisplay - yres);
 391                 }
 392                 else {
 393                         /* use the first preferred mode */
 394                         tmp = (m->type & DRM_MODE_TYPE_PREFERRED) ? 0 : dist;
 395                 }
 396
 397                 if (tmp < dist) {
 398                         mode = m;
 399                         dist = tmp;
 400                         if (!dist)
 401                                 break;
 402                 }
 403         }
 404
 405         /* fallback to the first mode */
 406         if (!mode)
 407                 mode = &connector->modes[0];
 408
 409         *bpp /= 8;
 410
 411         return mode;
 412 }
 413
 414 /*
 415  * Initialize KMS with a connector.
 416  */
 417 static int drm_kms_init_with_connector(struct gralloc_drm_t *drm,
 418                 drmModeConnectorPtr connector)
 419 {
 420         drmModeEncoderPtr encoder;
 421         drmModeModeInfoPtr mode;
 422         int bpp, i;
 423
 424         if (!connector->count_modes)
 425                 return -EINVAL;
 426
 427         encoder = drmModeGetEncoder(drm->fd, connector->encoders[0]);
 428         if (!encoder)
 429                 return -EINVAL;
 430
 431         for (i = 0; i < drm->resources->count_crtcs; i++) {
 432                 if (encoder->possible_crtcs & (1 << i))
 433                         break;
 434         }
 435         drmModeFreeEncoder(encoder);
 436         if (i == drm->resources->count_crtcs)
 437                 return -EINVAL;
 438
 439         drm->crtc_id = drm->resources->crtcs[i];
 440         drm->connector_id = connector->connector_id;
 441
 442         mode = find_mode(connector, &bpp);
 443         drm->mode = *mode;
 444         switch (bpp) {
 445         case 2:
 446                 drm->fb_format = HAL_PIXEL_FORMAT_RGB_565;
 447                 break;
 448         case 4:
 449         default:
 450                 drm->fb_format = HAL_PIXEL_FORMAT_BGRA_8888;
 451                 break;
 452         }
 453
 454         if (connector->mmWidth && connector->mmHeight) {
 455                 drm->xdpi = (drm->mode.hdisplay * 25.4 / connector->mmWidth);
 456                 drm->ydpi = (drm->mode.vdisplay * 25.4 / connector->mmHeight);
 457         }
 458         else {
 459                 drm->xdpi = 75;
 460                 drm->ydpi = 75;
 461         }
 462
 463 #ifdef DRM_MODE_FEATURE_DIRTYFB
 464         drm->clip.x1 = 0;
 465         drm->clip.y1 = 0;
 466         drm->clip.x2 = drm->mode.hdisplay;
 467         drm->clip.y2 = drm->mode.vdisplay;
 468 #endif
 469
 470         return 0;
 471 }
 472
 473 /*
 474  * Initialize KMS.
 475  */
 476 int gralloc_drm_init_kms(struct gralloc_drm_t *drm)
 477 {
 478         int i, ret;
 479
 480         if (drm->resources)
 481                 return 0;
 482
 483         drm->resources = drmModeGetResources(drm->fd);
 484         if (!drm->resources) {
 485                 LOGE("failed to get modeset resources");
 486                 return -EINVAL;
 487         }
 488
 489         /* find the crtc/connector/mode to use */
 490         for (i = 0; i < drm->resources->count_connectors; i++) {
 491                 drmModeConnectorPtr connector;
 492
 493                 connector = drmModeGetConnector(drm->fd,
 494                                 drm->resources->connectors[i]);
 495                 if (connector) {
 496                         if (connector->connection == DRM_MODE_CONNECTED) {
 497                                 if (!drm_kms_init_with_connector(drm,
 498                                                         connector))
 499                                         break;
 500                         }
 501
 502                         drmModeFreeConnector(connector);
 503                 }
 504         }
 505         if (i == drm->resources->count_connectors) {
 506                 LOGE("failed to find a valid crtc/connector/mode combination");
 507                 drmModeFreeResources(drm->resources);
 508                 drm->resources = NULL;
 509
 510                 return -EINVAL;
 511         }
 512
 513         drm_kms_init_features(drm);
 514         drm->first_post = 1;
 515
 516         return 0;
 517 }
 518
 519 /*
 520  * Initialize a framebuffer device with KMS info.
 521  */
 522 void gralloc_drm_get_kms_info(struct gralloc_drm_t *drm,
 523                 struct framebuffer_device_t *fb)
 524 {
 525         *((uint32_t *) &fb->flags) = 0x0;
 526         *((uint32_t *) &fb->width) = drm->mode.hdisplay;
 527         *((uint32_t *) &fb->height) = drm->mode.vdisplay;
 528         *((int *)      &fb->stride) = drm->mode.hdisplay;
 529         *((float *)    &fb->fps) = drm->mode.vrefresh;
 530
 531         *((int *)      &fb->format) = drm->fb_format;
 532         *((float *)    &fb->xdpi) = drm->xdpi;
 533         *((float *)    &fb->ydpi) = drm->ydpi;
 534         *((int *)      &fb->minSwapInterval) = drm->swap_interval;
 535         *((int *)      &fb->maxSwapInterval) = drm->swap_interval;
 536 }
 537
 538 /*
 539  * Return true if fb posting is pipelined.
 540  */
 541 int gralloc_drm_is_kms_pipelined(struct gralloc_drm_t *drm)
 542 {
 543         return (drm->swap_mode != DRM_SWAP_SETCRTC);
 544 }