src/gallium/drivers/iris/iris_binder.c

   1 /*
   2  * Copyright © 2018 Intel Corporation
   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  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * 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 AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include <stdlib.h>
  25 #include "util/u_math.h"
  26 #include "iris_binder.h"
  27 #include "iris_bufmgr.h"
  28
  29 /* 64kb */
  30 #define BINDER_SIZE (64 * 1024)
  31
  32 void *
  33 iris_binder_reserve(struct iris_binder *binder, unsigned size,
  34                     uint32_t *out_offset)
  35 {
  36    /* XXX: if we ever make this allocate a new BO, then make binder_reserve
  37     * return the BO, so at least verify use_pinned_bo gets the right one
  38     */
  39    /* XXX: Implement a real ringbuffer, for now just croak if run out */
  40    assert(size > 0);
  41    assert(binder->insert_point + size <= BINDER_SIZE);
  42
  43    assert((binder->insert_point % 64) == 0);
  44    *out_offset = binder->insert_point;
  45
  46    binder->insert_point = align(binder->insert_point + size, 64);
  47
  48    return binder->map + *out_offset;
  49 }
  50
  51 void
  52 iris_init_binder(struct iris_binder *binder, struct iris_bufmgr *bufmgr)
  53 {
  54    binder->bo =
  55       iris_bo_alloc(bufmgr, "binder", BINDER_SIZE, IRIS_MEMZONE_BINDER);
  56    binder->map = iris_bo_map(NULL, binder->bo, MAP_WRITE);
  57    binder->insert_point = 64; // XXX: avoid null pointer, it confuses tools
  58 }
  59
  60 void
  61 iris_destroy_binder(struct iris_binder *binder)
  62 {
  63    iris_bo_unreference(binder->bo);
  64 }