src/mesa/drivers/dri/i965/intel_upload.c

   1 /*
   2  * Copyright 2003 VMware, Inc.
   3  * Copyright © 2007 Intel Corporation
   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 (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * @file intel_upload.c
  27  *
  28  * Batched upload via BOs.
  29  */
  30
  31 #include "main/imports.h"
  32 #include "main/macros.h"
  33 #include "brw_bufmgr.h"
  34 #include "brw_context.h"
  35 #include "intel_buffer_objects.h"
  36
  37 void
  38 brw_upload_finish(struct brw_uploader *upload)
  39 {
  40    assert((upload->bo == NULL) == (upload->map == NULL));
  41    if (!upload->bo)
  42       return;
  43
  44    brw_bo_unmap(upload->bo);
  45    brw_bo_unreference(upload->bo);
  46    upload->bo = NULL;
  47    upload->map = NULL;
  48    upload->next_offset = 0;
  49 }
  50
  51 /**
  52  * Interface for getting memory for uploading streamed data to the GPU
  53  *
  54  * In most cases, streamed data (for GPU state structures, for example) is
  55  * uploaded through brw_state_batch(), since that interface allows relocations
  56  * from the streamed space returned to other BOs.  However, that interface has
  57  * the restriction that the amount of space allocated has to be "small".
  58  *
  59  * This interface, on the other hand, is able to handle arbitrary sized
  60  * allocation requests, though it will batch small allocations into the same
  61  * BO for efficiency and reduced memory footprint.
  62  *
  63  * \note The returned pointer is valid only until brw_upload_finish().
  64  *
  65  * \param out_bo Pointer to a BO, which must point to a valid BO or NULL on
  66  * entry, and will have a reference to the new BO containing the state on
  67  * return.
  68  *
  69  * \param out_offset Offset within the buffer object that the data will land.
  70  */
  71 void *
  72 brw_upload_space(struct brw_uploader *upload,
  73                  uint32_t size,
  74                  uint32_t alignment,
  75                  struct brw_bo **out_bo,
  76                  uint32_t *out_offset)
  77 {
  78    uint32_t offset;
  79
  80    offset = ALIGN_NPOT(upload->next_offset, alignment);
  81    if (upload->bo && offset + size > upload->bo->size) {
  82       brw_upload_finish(upload);
  83       offset = 0;
  84    }
  85
  86    assert((upload->bo == NULL) == (upload->map == NULL));
  87    if (!upload->bo) {
  88       upload->bo = brw_bo_alloc(upload->bufmgr, "streamed data",
  89                                 MAX2(upload->default_size, size),
  90                                 BRW_MEMZONE_OTHER);
  91       upload->map = brw_bo_map(NULL, upload->bo,
  92                                MAP_READ | MAP_WRITE |
  93                                MAP_PERSISTENT | MAP_ASYNC);
  94    }
  95
  96    upload->next_offset = offset + size;
  97
  98    *out_offset = offset;
  99    if (*out_bo != upload->bo) {
 100       brw_bo_unreference(*out_bo);
 101       *out_bo = upload->bo;
 102       brw_bo_reference(upload->bo);
 103    }
 104
 105    return upload->map + offset;
 106 }
 107
 108 /**
 109  * Handy interface to upload some data to temporary GPU memory quickly.
 110  *
 111  * References to this memory should not be retained across batch flushes.
 112  */
 113 void
 114 brw_upload_data(struct brw_uploader *upload,
 115                 const void *data,
 116                 uint32_t size,
 117                 uint32_t alignment,
 118                 struct brw_bo **out_bo,
 119                 uint32_t *out_offset)
 120 {
 121    void *dst = brw_upload_space(upload, size, alignment, out_bo, out_offset);
 122    memcpy(dst, data, size);
 123 }
 124
 125 void
 126 brw_upload_init(struct brw_uploader *upload,
 127                 struct brw_bufmgr *bufmgr,
 128                 unsigned default_size)
 129 {
 130    upload->bufmgr = bufmgr;
 131    upload->bo = NULL;
 132    upload->map = NULL;
 133    upload->next_offset = 0;
 134    upload->default_size = default_size;
 135 }