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/mtypes.h"
  33 #include "main/macros.h"
  34 #include "main/bufferobj.h"
  35
  36 #include "brw_context.h"
  37 #include "intel_blit.h"
  38 #include "intel_buffer_objects.h"
  39 #include "intel_batchbuffer.h"
  40 #include "intel_fbo.h"
  41 #include "intel_mipmap_tree.h"
  42
  43 #include "brw_context.h"
  44
  45 #define INTEL_UPLOAD_SIZE (64*1024)
  46
  47 /**
  48  * Like ALIGN(), but works with a non-power-of-two alignment.
  49  */
  50 #define ALIGN_NPOT(value, alignment) \
  51    (((value) + (alignment) - 1) / (alignment) * (alignment))
  52
  53 void
  54 intel_upload_finish(struct brw_context *brw)
  55 {
  56    if (!brw->upload.bo)
  57       return;
  58
  59    drm_intel_bo_unmap(brw->upload.bo);
  60    drm_intel_bo_unreference(brw->upload.bo);
  61    brw->upload.bo = NULL;
  62    brw->upload.next_offset = 0;
  63 }
  64
  65 /**
  66  * Interface for getting memory for uploading streamed data to the GPU
  67  *
  68  * In most cases, streamed data (for GPU state structures, for example) is
  69  * uploaded through brw_state_batch(), since that interface allows relocations
  70  * from the streamed space returned to other BOs.  However, that interface has
  71  * the restriction that the amount of space allocated has to be "small" (see
  72  * estimated_max_prim_size in brw_draw.c).
  73  *
  74  * This interface, on the other hand, is able to handle arbitrary sized
  75  * allocation requests, though it will batch small allocations into the same
  76  * BO for efficiency and reduced memory footprint.
  77  *
  78  * \note The returned pointer is valid only until intel_upload_finish(), which
  79  * will happen at batch flush or the next
  80  * intel_upload_space()/intel_upload_data().
  81  *
  82  * \param out_bo Pointer to a BO, which must point to a valid BO or NULL on
  83  * entry, and will have a reference to the new BO containing the state on
  84  * return.
  85  *
  86  * \param out_offset Offset within the buffer object that the data will land.
  87  */
  88 void *
  89 intel_upload_space(struct brw_context *brw,
  90                    uint32_t size,
  91                    uint32_t alignment,
  92                    drm_intel_bo **out_bo,
  93                    uint32_t *out_offset)
  94 {
  95    uint32_t offset;
  96
  97    offset = ALIGN_NPOT(brw->upload.next_offset, alignment);
  98    if (brw->upload.bo && offset + size > brw->upload.bo->size) {
  99       intel_upload_finish(brw);
 100       offset = 0;
 101    }
 102
 103    if (!brw->upload.bo) {
 104       brw->upload.bo = drm_intel_bo_alloc(brw->bufmgr, "streamed data",
 105                                           MAX2(INTEL_UPLOAD_SIZE, size), 4096);
 106       if (brw->has_llc)
 107          drm_intel_bo_map(brw->upload.bo, true);
 108       else
 109          drm_intel_gem_bo_map_gtt(brw->upload.bo);
 110    }
 111
 112    brw->upload.next_offset = offset + size;
 113
 114    *out_offset = offset;
 115    if (*out_bo != brw->upload.bo) {
 116       drm_intel_bo_unreference(*out_bo);
 117       *out_bo = brw->upload.bo;
 118       drm_intel_bo_reference(brw->upload.bo);
 119    }
 120
 121    return brw->upload.bo->virtual + offset;
 122 }
 123
 124 /**
 125  * Handy interface to upload some data to temporary GPU memory quickly.
 126  *
 127  * References to this memory should not be retained across batch flushes.
 128  */
 129 void
 130 intel_upload_data(struct brw_context *brw,
 131                   const void *data,
 132                   uint32_t size,
 133                   uint32_t alignment,
 134                   drm_intel_bo **out_bo,
 135                   uint32_t *out_offset)
 136 {
 137    void *dst = intel_upload_space(brw, size, alignment, out_bo, out_offset);
 138    memcpy(dst, data, size);
 139 }