src/gallium/drivers/etnaviv/etnaviv_resource.c

   1 /*
   2  * Copyright (c) 2012-2015 Etnaviv Project
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sub license,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the
  12  * next paragraph) shall be included in all copies or substantial portions
  13  * 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 NON-INFRINGEMENT. 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  * Authors:
  24  *    Wladimir J. van der Laan <laanwj@gmail.com>
  25  */
  26
  27 #include "etnaviv_resource.h"
  28
  29 #include "hw/common.xml.h"
  30
  31 #include "etnaviv_context.h"
  32 #include "etnaviv_debug.h"
  33 #include "etnaviv_screen.h"
  34 #include "etnaviv_translate.h"
  35
  36 #include "util/u_inlines.h"
  37 #include "util/u_memory.h"
  38
  39 #include <drm_fourcc.h>
  40
  41 #ifndef DRM_FORMAT_MOD_INVALID
  42 #define DRM_FORMAT_MOD_INVALID ((1ULL<<56) - 1)
  43 #endif
  44
  45 static enum etna_surface_layout modifier_to_layout(uint64_t modifier)
  46 {
  47    switch (modifier) {
  48    case DRM_FORMAT_MOD_VIVANTE_TILED:
  49       return ETNA_LAYOUT_TILED;
  50    case DRM_FORMAT_MOD_VIVANTE_SUPER_TILED:
  51       return ETNA_LAYOUT_SUPER_TILED;
  52    case DRM_FORMAT_MOD_VIVANTE_SPLIT_TILED:
  53       return ETNA_LAYOUT_MULTI_TILED;
  54    case DRM_FORMAT_MOD_VIVANTE_SPLIT_SUPER_TILED:
  55       return ETNA_LAYOUT_MULTI_SUPERTILED;
  56    case DRM_FORMAT_MOD_LINEAR:
  57    default:
  58       return ETNA_LAYOUT_LINEAR;
  59    }
  60 }
  61
  62 static uint64_t layout_to_modifier(enum etna_surface_layout layout)
  63 {
  64    switch (layout) {
  65    case ETNA_LAYOUT_TILED:
  66       return DRM_FORMAT_MOD_VIVANTE_TILED;
  67    case ETNA_LAYOUT_SUPER_TILED:
  68       return DRM_FORMAT_MOD_VIVANTE_SUPER_TILED;
  69    case ETNA_LAYOUT_MULTI_TILED:
  70       return DRM_FORMAT_MOD_VIVANTE_SPLIT_TILED;
  71    case ETNA_LAYOUT_MULTI_SUPERTILED:
  72       return DRM_FORMAT_MOD_VIVANTE_SPLIT_SUPER_TILED;
  73    case ETNA_LAYOUT_LINEAR:
  74       return DRM_FORMAT_MOD_LINEAR;
  75    default:
  76       return DRM_FORMAT_MOD_INVALID;
  77    }
  78 }
  79
  80 /* A tile is 4x4 pixels, having 'screen->specs.bits_per_tile' of tile status.
  81  * So, in a buffer of N pixels, there are N / (4 * 4) tiles.
  82  * We need N * screen->specs.bits_per_tile / (4 * 4) bits of tile status, or
  83  * N * screen->specs.bits_per_tile / (4 * 4 * 8) bytes.
  84  */
  85 bool
  86 etna_screen_resource_alloc_ts(struct pipe_screen *pscreen,
  87                               struct etna_resource *rsc)
  88 {
  89    struct etna_screen *screen = etna_screen(pscreen);
  90    size_t rt_ts_size, ts_layer_stride, pixels;
  91
  92    assert(!rsc->ts_bo);
  93
  94    /* TS only for level 0 -- XXX is this formula correct? */
  95    pixels = rsc->levels[0].layer_stride / util_format_get_blocksize(rsc->base.format);
  96    ts_layer_stride = align(pixels * screen->specs.bits_per_tile / 0x80,
  97                            0x100 * screen->specs.pixel_pipes);
  98    rt_ts_size = ts_layer_stride * rsc->base.array_size;
  99    if (rt_ts_size == 0)
 100       return true;
 101
 102    DBG_F(ETNA_DBG_RESOURCE_MSGS, "%p: Allocating tile status of size %zu",
 103          rsc, rt_ts_size);
 104
 105    struct etna_bo *rt_ts;
 106    rt_ts = etna_bo_new(screen->dev, rt_ts_size, DRM_ETNA_GEM_CACHE_WC);
 107
 108    if (unlikely(!rt_ts)) {
 109       BUG("Problem allocating tile status for resource");
 110       return false;
 111    }
 112
 113    rsc->ts_bo = rt_ts;
 114    rsc->levels[0].ts_offset = 0;
 115    rsc->levels[0].ts_layer_stride = ts_layer_stride;
 116    rsc->levels[0].ts_size = rt_ts_size;
 117
 118    /* It is important to initialize the TS, as random pattern
 119     * can result in crashes. Do this on the CPU as this only happens once
 120     * per surface anyway and it's a small area, so it may not be worth
 121     * queuing this to the GPU. */
 122    void *ts_map = etna_bo_map(rt_ts);
 123    memset(ts_map, screen->specs.ts_clear_value, rt_ts_size);
 124
 125    return true;
 126 }
 127
 128 static boolean
 129 etna_screen_can_create_resource(struct pipe_screen *pscreen,
 130                                 const struct pipe_resource *templat)
 131 {
 132    struct etna_screen *screen = etna_screen(pscreen);
 133    if (!translate_samples_to_xyscale(templat->nr_samples, NULL, NULL, NULL))
 134       return false;
 135
 136    /* templat->bind is not set here, so we must use the minimum sizes */
 137    uint max_size =
 138       MIN2(screen->specs.max_rendertarget_size, screen->specs.max_texture_size);
 139
 140    if (templat->width0 > max_size || templat->height0 > max_size)
 141       return false;
 142
 143    return true;
 144 }
 145
 146 static unsigned
 147 setup_miptree(struct etna_resource *rsc, unsigned paddingX, unsigned paddingY,
 148               unsigned msaa_xscale, unsigned msaa_yscale)
 149 {
 150    struct pipe_resource *prsc = &rsc->base;
 151    unsigned level, size = 0;
 152    unsigned width = prsc->width0;
 153    unsigned height = prsc->height0;
 154    unsigned depth = prsc->depth0;
 155
 156    for (level = 0; level <= prsc->last_level; level++) {
 157       struct etna_resource_level *mip = &rsc->levels[level];
 158
 159       mip->width = width;
 160       mip->height = height;
 161       mip->padded_width = align(width * msaa_xscale, paddingX);
 162       mip->padded_height = align(height * msaa_yscale, paddingY);
 163       mip->stride = util_format_get_stride(prsc->format, mip->padded_width);
 164       mip->offset = size;
 165       mip->layer_stride = mip->stride * util_format_get_nblocksy(prsc->format, mip->padded_height);
 166       mip->size = prsc->array_size * mip->layer_stride;
 167
 168       /* align levels to 64 bytes to be able to render to them */
 169       size += align(mip->size, ETNA_PE_ALIGNMENT) * depth;
 170
 171       width = u_minify(width, 1);
 172       height = u_minify(height, 1);
 173       depth = u_minify(depth, 1);
 174    }
 175
 176    return size;
 177 }
 178
 179 /* Create a new resource object, using the given template info */
 180 struct pipe_resource *
 181 etna_resource_alloc(struct pipe_screen *pscreen, unsigned layout,
 182                     uint64_t modifier, const struct pipe_resource *templat)
 183 {
 184    struct etna_screen *screen = etna_screen(pscreen);
 185    struct etna_resource *rsc;
 186    unsigned size;
 187
 188    DBG_F(ETNA_DBG_RESOURCE_MSGS,
 189          "target=%d, format=%s, %ux%ux%u, array_size=%u, "
 190          "last_level=%u, nr_samples=%u, usage=%u, bind=%x, flags=%x",
 191          templat->target, util_format_name(templat->format), templat->width0,
 192          templat->height0, templat->depth0, templat->array_size,
 193          templat->last_level, templat->nr_samples, templat->usage,
 194          templat->bind, templat->flags);
 195
 196    /* Determine scaling for antialiasing, allow override using debug flag */
 197    int nr_samples = templat->nr_samples;
 198    if ((templat->bind & (PIPE_BIND_RENDER_TARGET | PIPE_BIND_DEPTH_STENCIL)) &&
 199        !(templat->bind & PIPE_BIND_SAMPLER_VIEW)) {
 200       if (DBG_ENABLED(ETNA_DBG_MSAA_2X))
 201          nr_samples = 2;
 202       if (DBG_ENABLED(ETNA_DBG_MSAA_4X))
 203          nr_samples = 4;
 204    }
 205
 206    int msaa_xscale = 1, msaa_yscale = 1;
 207    if (!translate_samples_to_xyscale(nr_samples, &msaa_xscale, &msaa_yscale, NULL)) {
 208       /* Number of samples not supported */
 209       return NULL;
 210    }
 211
 212    /* If we have the TEXTURE_HALIGN feature, we can always align to the
 213     * resolve engine's width.  If not, we must not align resources used
 214     * only for textures. */
 215    bool rs_align = VIV_FEATURE(screen, chipMinorFeatures1, TEXTURE_HALIGN) ||
 216                    !etna_resource_sampler_only(templat);
 217
 218    /* Determine needed padding (alignment of height/width) */
 219    unsigned paddingX = 0, paddingY = 0;
 220    unsigned halign = TEXTURE_HALIGN_FOUR;
 221    etna_layout_multiple(layout, screen->specs.pixel_pipes, rs_align, &paddingX,
 222                         &paddingY, &halign);
 223    assert(paddingX && paddingY);
 224
 225    if (templat->target != PIPE_BUFFER)
 226       etna_adjust_rs_align(screen->specs.pixel_pipes, NULL, &paddingY);
 227
 228    if (templat->bind & PIPE_BIND_SCANOUT) {
 229       struct pipe_resource scanout_templat = *templat;
 230       struct renderonly_scanout *scanout;
 231       struct winsys_handle handle;
 232
 233       /* pad scanout buffer size to be compatible with the RS */
 234       if (modifier == DRM_FORMAT_MOD_LINEAR)
 235          etna_adjust_rs_align(screen->specs.pixel_pipes, &paddingX, &paddingY);
 236
 237       scanout_templat.width0 = align(scanout_templat.width0, paddingX);
 238       scanout_templat.height0 = align(scanout_templat.height0, paddingY);
 239
 240       scanout = renderonly_scanout_for_resource(&scanout_templat,
 241                                                 screen->ro, &handle);
 242       if (!scanout)
 243          return NULL;
 244
 245       assert(handle.type == DRM_API_HANDLE_TYPE_FD);
 246       handle.modifier = modifier;
 247       rsc = etna_resource(pscreen->resource_from_handle(pscreen, templat,
 248                                                         &handle,
 249                                                         PIPE_HANDLE_USAGE_WRITE));
 250       close(handle.handle);
 251       if (!rsc)
 252          return NULL;
 253
 254       rsc->scanout = scanout;
 255
 256       return &rsc->base;
 257    }
 258
 259    rsc = CALLOC_STRUCT(etna_resource);
 260    if (!rsc)
 261       return NULL;
 262
 263    rsc->base = *templat;
 264    rsc->base.screen = pscreen;
 265    rsc->base.nr_samples = nr_samples;
 266    rsc->layout = layout;
 267    rsc->halign = halign;
 268
 269    pipe_reference_init(&rsc->base.reference, 1);
 270    list_inithead(&rsc->list);
 271
 272    size = setup_miptree(rsc, paddingX, paddingY, msaa_xscale, msaa_yscale);
 273
 274    uint32_t flags = DRM_ETNA_GEM_CACHE_WC;
 275    if (templat->bind & PIPE_BIND_VERTEX_BUFFER)
 276       flags |= DRM_ETNA_GEM_FORCE_MMU;
 277    struct etna_bo *bo = etna_bo_new(screen->dev, size, flags);
 278    if (unlikely(bo == NULL)) {
 279       BUG("Problem allocating video memory for resource");
 280       goto free_rsc;
 281    }
 282
 283    rsc->bo = bo;
 284    rsc->ts_bo = 0; /* TS is only created when first bound to surface */
 285
 286    if (DBG_ENABLED(ETNA_DBG_ZERO)) {
 287       void *map = etna_bo_map(bo);
 288       memset(map, 0, size);
 289    }
 290
 291    return &rsc->base;
 292
 293 free_rsc:
 294    FREE(rsc);
 295    return NULL;
 296 }
 297
 298 static struct pipe_resource *
 299 etna_resource_create(struct pipe_screen *pscreen,
 300                      const struct pipe_resource *templat)
 301 {
 302    struct etna_screen *screen = etna_screen(pscreen);
 303
 304    /* Figure out what tiling to use -- for now, assume that texture cannot be linear.
 305     * there is a capability LINEAR_TEXTURE_SUPPORT (supported on gc880 and
 306     * gc2000 at least), but not sure how it works.
 307     * Buffers always have LINEAR layout.
 308     */
 309    unsigned layout = ETNA_LAYOUT_LINEAR;
 310    if (etna_resource_sampler_only(templat)) {
 311       /* The buffer is only used for texturing, so create something
 312        * directly compatible with the sampler.  Such a buffer can
 313        * never be rendered to. */
 314       layout = ETNA_LAYOUT_TILED;
 315
 316       if (util_format_is_compressed(templat->format))
 317          layout = ETNA_LAYOUT_LINEAR;
 318    } else if (templat->target != PIPE_BUFFER) {
 319       bool want_multitiled = false;
 320       bool want_supertiled = screen->specs.can_supertile;
 321
 322       /* When this GPU supports single-buffer rendering, don't ever enable
 323        * multi-tiling. This replicates the blob behavior on GC3000.
 324        */
 325       if (!screen->specs.single_buffer)
 326          want_multitiled = screen->specs.pixel_pipes > 1;
 327
 328       /* Keep single byte blocksized resources as tiled, since we
 329        * are unable to use the RS blit to de-tile them. However,
 330        * if they're used as a render target or depth/stencil, they
 331        * must be multi-tiled for GPUs with multiple pixel pipes.
 332        * Ignore depth/stencil here, but it is an error for a render
 333        * target.
 334        */
 335       if (util_format_get_blocksize(templat->format) == 1 &&
 336           !(templat->bind & PIPE_BIND_DEPTH_STENCIL)) {
 337          assert(!(templat->bind & PIPE_BIND_RENDER_TARGET && want_multitiled));
 338          want_multitiled = want_supertiled = false;
 339       }
 340
 341       layout = ETNA_LAYOUT_BIT_TILE;
 342       if (want_multitiled)
 343          layout |= ETNA_LAYOUT_BIT_MULTI;
 344       if (want_supertiled)
 345          layout |= ETNA_LAYOUT_BIT_SUPER;
 346    }
 347
 348    if (templat->target == PIPE_TEXTURE_3D)
 349       layout = ETNA_LAYOUT_LINEAR;
 350
 351    /* modifier is only used for scanout surfaces, so safe to use LINEAR here */
 352    return etna_resource_alloc(pscreen, layout, DRM_FORMAT_MOD_LINEAR, templat);
 353 }
 354
 355 enum modifier_priority {
 356    MODIFIER_PRIORITY_INVALID = 0,
 357    MODIFIER_PRIORITY_LINEAR,
 358    MODIFIER_PRIORITY_SPLIT_TILED,
 359    MODIFIER_PRIORITY_SPLIT_SUPER_TILED,
 360    MODIFIER_PRIORITY_TILED,
 361    MODIFIER_PRIORITY_SUPER_TILED,
 362 };
 363
 364 const uint64_t priority_to_modifier[] = {
 365    [MODIFIER_PRIORITY_INVALID] = DRM_FORMAT_MOD_INVALID,
 366    [MODIFIER_PRIORITY_LINEAR] = DRM_FORMAT_MOD_LINEAR,
 367    [MODIFIER_PRIORITY_SPLIT_TILED] = DRM_FORMAT_MOD_VIVANTE_SPLIT_TILED,
 368    [MODIFIER_PRIORITY_SPLIT_SUPER_TILED] = DRM_FORMAT_MOD_VIVANTE_SPLIT_SUPER_TILED,
 369    [MODIFIER_PRIORITY_TILED] = DRM_FORMAT_MOD_VIVANTE_TILED,
 370    [MODIFIER_PRIORITY_SUPER_TILED] = DRM_FORMAT_MOD_VIVANTE_SUPER_TILED,
 371 };
 372
 373 static uint64_t
 374 select_best_modifier(const struct etna_screen * screen,
 375                      const uint64_t *modifiers, const unsigned count)
 376 {
 377    enum modifier_priority prio = MODIFIER_PRIORITY_INVALID;
 378
 379    for (int i = 0; i < count; i++) {
 380       switch (modifiers[i]) {
 381       case DRM_FORMAT_MOD_VIVANTE_SUPER_TILED:
 382          if ((screen->specs.pixel_pipes > 1 && !screen->specs.single_buffer) ||
 383              !screen->specs.can_supertile)
 384             break;
 385          prio = MAX2(prio, MODIFIER_PRIORITY_SUPER_TILED);
 386          break;
 387       case DRM_FORMAT_MOD_VIVANTE_TILED:
 388          if (screen->specs.pixel_pipes > 1 && !screen->specs.single_buffer)
 389             break;
 390          prio = MAX2(prio, MODIFIER_PRIORITY_TILED);
 391          break;
 392       case DRM_FORMAT_MOD_VIVANTE_SPLIT_SUPER_TILED:
 393          if ((screen->specs.pixel_pipes < 2) || !screen->specs.can_supertile)
 394             break;
 395          prio = MAX2(prio, MODIFIER_PRIORITY_SPLIT_SUPER_TILED);
 396          break;
 397       case DRM_FORMAT_MOD_VIVANTE_SPLIT_TILED:
 398          if (screen->specs.pixel_pipes < 2)
 399             break;
 400          prio = MAX2(prio, MODIFIER_PRIORITY_SPLIT_TILED);
 401          break;
 402       case DRM_FORMAT_MOD_LINEAR:
 403          prio = MAX2(prio, MODIFIER_PRIORITY_LINEAR);
 404          break;
 405       case DRM_FORMAT_MOD_INVALID:
 406       default:
 407          break;
 408       }
 409    }
 410
 411    return priority_to_modifier[prio];
 412 }
 413
 414 static struct pipe_resource *
 415 etna_resource_create_modifiers(struct pipe_screen *pscreen,
 416                                const struct pipe_resource *templat,
 417                                const uint64_t *modifiers, int count)
 418 {
 419    struct etna_screen *screen = etna_screen(pscreen);
 420    struct pipe_resource tmpl = *templat;
 421    uint64_t modifier = select_best_modifier(screen, modifiers, count);
 422
 423    if (modifier == DRM_FORMAT_MOD_INVALID)
 424       return NULL;
 425
 426    /*
 427     * We currently assume that all buffers allocated through this interface
 428     * should be scanout enabled.
 429     */
 430    tmpl.bind |= PIPE_BIND_SCANOUT;
 431
 432    return etna_resource_alloc(pscreen, modifier_to_layout(modifier),
 433                               modifier, &tmpl);
 434 }
 435
 436 static void
 437 etna_resource_changed(struct pipe_screen *pscreen, struct pipe_resource *prsc)
 438 {
 439    struct etna_resource *res = etna_resource(prsc);
 440
 441    if (res->external)
 442       etna_resource(res->external)->seqno++;
 443    else
 444       res->seqno++;
 445 }
 446
 447 static void
 448 etna_resource_destroy(struct pipe_screen *pscreen, struct pipe_resource *prsc)
 449 {
 450    struct etna_resource *rsc = etna_resource(prsc);
 451
 452    if (rsc->bo)
 453       etna_bo_del(rsc->bo);
 454
 455    if (rsc->ts_bo)
 456       etna_bo_del(rsc->ts_bo);
 457
 458    if (rsc->scanout)
 459       renderonly_scanout_destroy(rsc->scanout, etna_screen(pscreen)->ro);
 460
 461    list_delinit(&rsc->list);
 462
 463    pipe_resource_reference(&rsc->texture, NULL);
 464    pipe_resource_reference(&rsc->external, NULL);
 465
 466    FREE(rsc);
 467 }
 468
 469 static struct pipe_resource *
 470 etna_resource_from_handle(struct pipe_screen *pscreen,
 471                           const struct pipe_resource *tmpl,
 472                           struct winsys_handle *handle, unsigned usage)
 473 {
 474    struct etna_screen *screen = etna_screen(pscreen);
 475    struct etna_resource *rsc;
 476    struct etna_resource_level *level;
 477    struct pipe_resource *prsc;
 478    struct pipe_resource *ptiled = NULL;
 479
 480    DBG("target=%d, format=%s, %ux%ux%u, array_size=%u, last_level=%u, "
 481        "nr_samples=%u, usage=%u, bind=%x, flags=%x",
 482        tmpl->target, util_format_name(tmpl->format), tmpl->width0,
 483        tmpl->height0, tmpl->depth0, tmpl->array_size, tmpl->last_level,
 484        tmpl->nr_samples, tmpl->usage, tmpl->bind, tmpl->flags);
 485
 486    rsc = CALLOC_STRUCT(etna_resource);
 487    if (!rsc)
 488       return NULL;
 489
 490    level = &rsc->levels[0];
 491    prsc = &rsc->base;
 492
 493    *prsc = *tmpl;
 494
 495    pipe_reference_init(&prsc->reference, 1);
 496    list_inithead(&rsc->list);
 497    prsc->screen = pscreen;
 498
 499    rsc->bo = etna_screen_bo_from_handle(pscreen, handle, &level->stride);
 500    if (!rsc->bo)
 501       goto fail;
 502
 503    rsc->seqno = 1;
 504    rsc->layout = modifier_to_layout(handle->modifier);
 505    rsc->halign = TEXTURE_HALIGN_FOUR;
 506
 507
 508    level->width = tmpl->width0;
 509    level->height = tmpl->height0;
 510
 511    /* Determine padding of the imported resource. */
 512    unsigned paddingX = 0, paddingY = 0;
 513    etna_layout_multiple(rsc->layout, screen->specs.pixel_pipes,
 514                         VIV_FEATURE(screen, chipMinorFeatures1, TEXTURE_HALIGN),
 515                         &paddingX, &paddingY, &rsc->halign);
 516
 517    etna_adjust_rs_align(screen->specs.pixel_pipes, NULL, &paddingY);
 518    level->padded_width = align(level->width, paddingX);
 519    level->padded_height = align(level->height, paddingY);
 520
 521    level->layer_stride = level->stride * util_format_get_nblocksy(prsc->format,
 522                                                                   level->padded_height);
 523
 524    /* The DDX must give us a BO which conforms to our padding size.
 525     * The stride of the BO must be greater or equal to our padded
 526     * stride. The size of the BO must accomodate the padded height. */
 527    if (level->stride < util_format_get_stride(tmpl->format, level->padded_width)) {
 528       BUG("BO stride is too small for RS engine width padding");
 529       goto fail;
 530    }
 531    if (etna_bo_size(rsc->bo) < level->stride * level->padded_height) {
 532       BUG("BO size is too small for RS engine height padding");
 533       goto fail;
 534    }
 535
 536    if (rsc->layout == ETNA_LAYOUT_LINEAR) {
 537       /*
 538        * Both sampler and pixel pipes can't handle linear, create a compatible
 539        * base resource, where we can attach the imported buffer as an external
 540        * resource.
 541        */
 542       struct pipe_resource tiled_templat = *tmpl;
 543
 544       /*
 545        * Remove BIND_SCANOUT to avoid recursion, as etna_resource_create uses
 546        * this function to import the scanout buffer and get a tiled resource.
 547        */
 548       tiled_templat.bind &= ~PIPE_BIND_SCANOUT;
 549
 550       ptiled = etna_resource_create(pscreen, &tiled_templat);
 551       if (!ptiled)
 552          goto fail;
 553
 554       etna_resource(ptiled)->external = prsc;
 555
 556       return ptiled;
 557    }
 558
 559    return prsc;
 560
 561 fail:
 562    etna_resource_destroy(pscreen, prsc);
 563    if (ptiled)
 564       etna_resource_destroy(pscreen, ptiled);
 565
 566    return NULL;
 567 }
 568
 569 static boolean
 570 etna_resource_get_handle(struct pipe_screen *pscreen,
 571                          struct pipe_context *pctx,
 572                          struct pipe_resource *prsc,
 573                          struct winsys_handle *handle, unsigned usage)
 574 {
 575    struct etna_resource *rsc = etna_resource(prsc);
 576    /* Scanout is always attached to the base resource */
 577    struct renderonly_scanout *scanout = rsc->scanout;
 578
 579    /*
 580     * External resources are preferred, so a import->export chain of
 581     * render/sampler incompatible buffers yield the same handle.
 582     */
 583    if (rsc->external)
 584       rsc = etna_resource(rsc->external);
 585
 586    handle->stride = rsc->levels[0].stride;
 587    handle->modifier = layout_to_modifier(rsc->layout);
 588
 589    if (handle->type == DRM_API_HANDLE_TYPE_SHARED) {
 590       return etna_bo_get_name(rsc->bo, &handle->handle) == 0;
 591    } else if (handle->type == DRM_API_HANDLE_TYPE_KMS) {
 592       if (renderonly_get_handle(scanout, handle)) {
 593          return TRUE;
 594       } else {
 595          handle->handle = etna_bo_handle(rsc->bo);
 596          return TRUE;
 597       }
 598    } else if (handle->type == DRM_API_HANDLE_TYPE_FD) {
 599       handle->handle = etna_bo_dmabuf(rsc->bo);
 600       return TRUE;
 601    } else {
 602       return FALSE;
 603    }
 604 }
 605
 606 void
 607 etna_resource_used(struct etna_context *ctx, struct pipe_resource *prsc,
 608                    enum etna_resource_status status)
 609 {
 610    struct etna_resource *rsc;
 611
 612    if (!prsc)
 613       return;
 614
 615    rsc = etna_resource(prsc);
 616    rsc->status |= status;
 617
 618    /* TODO resources can actually be shared across contexts,
 619     * so I'm not sure a single list-head will do the trick? */
 620    debug_assert((rsc->pending_ctx == ctx) || !rsc->pending_ctx);
 621    list_delinit(&rsc->list);
 622    list_addtail(&rsc->list, &ctx->used_resources);
 623    rsc->pending_ctx = ctx;
 624 }
 625
 626 void
 627 etna_resource_screen_init(struct pipe_screen *pscreen)
 628 {
 629    pscreen->can_create_resource = etna_screen_can_create_resource;
 630    pscreen->resource_create = etna_resource_create;
 631    pscreen->resource_create_with_modifiers = etna_resource_create_modifiers;
 632    pscreen->resource_from_handle = etna_resource_from_handle;
 633    pscreen->resource_get_handle = etna_resource_get_handle;
 634    pscreen->resource_changed = etna_resource_changed;
 635    pscreen->resource_destroy = etna_resource_destroy;
 636 }