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

   1 /*
   2  * Copyright © 2014 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  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   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 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 NONINFRINGEMENT.  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
  24 #include <sys/errno.h>
  25
  26 #include "main/condrender.h"
  27 #include "main/mtypes.h"
  28 #include "main/state.h"
  29 #include "brw_context.h"
  30 #include "brw_draw.h"
  31 #include "brw_state.h"
  32 #include "intel_batchbuffer.h"
  33 #include "intel_buffer_objects.h"
  34 #include "brw_defines.h"
  35
  36
  37 static void
  38 brw_dispatch_compute_common(struct gl_context *ctx)
  39 {
  40    struct brw_context *brw = brw_context(ctx);
  41    bool fail_next;
  42
  43    if (!_mesa_check_conditional_render(ctx))
  44       return;
  45
  46    if (ctx->NewState)
  47       _mesa_update_state(ctx);
  48
  49    brw_validate_textures(brw);
  50
  51    brw_predraw_resolve_inputs(brw, false, NULL);
  52
  53    /* Flush the batch if the batch/state buffers are nearly full.  We can
  54     * grow them if needed, but this is not free, so we'd like to avoid it.
  55     */
  56    intel_batchbuffer_require_space(brw, 600);
  57    brw_require_statebuffer_space(brw, 2500);
  58    intel_batchbuffer_save_state(brw);
  59    fail_next = intel_batchbuffer_saved_state_is_empty(brw);
  60
  61  retry:
  62    brw->batch.no_wrap = true;
  63    brw_upload_compute_state(brw);
  64
  65    brw->vtbl.emit_compute_walker(brw);
  66
  67    brw->batch.no_wrap = false;
  68
  69    if (!brw_batch_has_aperture_space(brw, 0)) {
  70       if (!fail_next) {
  71          intel_batchbuffer_reset_to_saved(brw);
  72          intel_batchbuffer_flush(brw);
  73          fail_next = true;
  74          goto retry;
  75       } else {
  76          int ret = intel_batchbuffer_flush(brw);
  77          WARN_ONCE(ret == -ENOSPC,
  78                    "i965: Single compute shader dispatch "
  79                    "exceeded available aperture space\n");
  80       }
  81    }
  82
  83    /* Now that we know we haven't run out of aperture space, we can safely
  84     * reset the dirty bits.
  85     */
  86    brw_compute_state_finished(brw);
  87
  88    if (brw->always_flush_batch)
  89       intel_batchbuffer_flush(brw);
  90
  91    brw_program_cache_check_size(brw);
  92
  93    /* Note: since compute shaders can't write to framebuffers, there's no need
  94     * to call brw_postdraw_set_buffers_need_resolve().
  95     */
  96 }
  97
  98 static void
  99 brw_dispatch_compute(struct gl_context *ctx, const GLuint *num_groups) {
 100    struct brw_context *brw = brw_context(ctx);
 101
 102    brw->compute.num_work_groups_bo = NULL;
 103    brw->compute.num_work_groups = num_groups;
 104    brw->compute.group_size = NULL;
 105    ctx->NewDriverState |= BRW_NEW_CS_WORK_GROUPS;
 106
 107    brw_dispatch_compute_common(ctx);
 108 }
 109
 110 static void
 111 brw_dispatch_compute_indirect(struct gl_context *ctx, GLintptr indirect)
 112 {
 113    struct brw_context *brw = brw_context(ctx);
 114    static const GLuint indirect_group_counts[3] = { 0, 0, 0 };
 115    struct gl_buffer_object *indirect_buffer = ctx->DispatchIndirectBuffer;
 116    struct brw_bo *bo =
 117       intel_bufferobj_buffer(brw,
 118                              intel_buffer_object(indirect_buffer),
 119                              indirect, 3 * sizeof(GLuint), false);
 120
 121    brw->compute.num_work_groups_bo = bo;
 122    brw->compute.num_work_groups_offset = indirect;
 123    brw->compute.num_work_groups = indirect_group_counts;
 124    brw->compute.group_size = NULL;
 125    ctx->NewDriverState |= BRW_NEW_CS_WORK_GROUPS;
 126
 127    brw_dispatch_compute_common(ctx);
 128 }
 129
 130 static void
 131 brw_dispatch_compute_group_size(struct gl_context *ctx,
 132                                 const GLuint *num_groups,
 133                                 const GLuint *group_size)
 134 {
 135    struct brw_context *brw = brw_context(ctx);
 136
 137    brw->compute.num_work_groups_bo = NULL;
 138    brw->compute.num_work_groups = num_groups;
 139    brw->compute.group_size = group_size;
 140    ctx->NewDriverState |= BRW_NEW_CS_WORK_GROUPS;
 141
 142    brw_dispatch_compute_common(ctx);
 143 }
 144
 145 void
 146 brw_init_compute_functions(struct dd_function_table *functions)
 147 {
 148    functions->DispatchCompute = brw_dispatch_compute;
 149    functions->DispatchComputeIndirect = brw_dispatch_compute_indirect;
 150    functions->DispatchComputeGroupSize = brw_dispatch_compute_group_size;
 151 }