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