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/glheader.h"
  28 #include "main/mtypes.h"
  29 #include "main/state.h"
  30 #include "brw_context.h"
  31 #include "brw_draw.h"
  32 #include "brw_state.h"
  33 #include "intel_batchbuffer.h"
  34
  35
  36 static void
  37 brw_emit_gpgpu_walker(struct brw_context *brw, const GLuint *num_groups)
  38 {
  39    _mesa_problem(&brw->ctx, "TODO: implement brw_emit_gpgpu_walker");
  40 }
  41
  42
  43 static void
  44 brw_dispatch_compute(struct gl_context *ctx, const GLuint *num_groups)
  45 {
  46    struct brw_context *brw = brw_context(ctx);
  47    int estimated_buffer_space_needed;
  48    bool fail_next = false;
  49
  50    if (!_mesa_check_conditional_render(ctx))
  51       return;
  52
  53    if (ctx->NewState)
  54       _mesa_update_state(ctx);
  55
  56    brw_validate_textures(brw);
  57
  58    const int sampler_state_size = 16; /* 16 bytes */
  59    estimated_buffer_space_needed = 512; /* batchbuffer commands */
  60    estimated_buffer_space_needed += (BRW_MAX_TEX_UNIT *
  61                                      (sampler_state_size +
  62                                       sizeof(struct gen5_sampler_default_color)));
  63    estimated_buffer_space_needed += 1024; /* push constants */
  64    estimated_buffer_space_needed += 512; /* misc. pad */
  65
  66    /* Flush the batch if it's approaching full, so that we don't wrap while
  67     * we've got validated state that needs to be in the same batch as the
  68     * primitives.
  69     */
  70    intel_batchbuffer_require_space(brw, estimated_buffer_space_needed,
  71                                    RENDER_RING);
  72    intel_batchbuffer_save_state(brw);
  73
  74  retry:
  75    brw->no_batch_wrap = true;
  76    brw_upload_compute_state(brw);
  77
  78    brw_emit_gpgpu_walker(brw, num_groups);
  79
  80    brw->no_batch_wrap = false;
  81
  82    if (dri_bufmgr_check_aperture_space(&brw->batch.bo, 1)) {
  83       if (!fail_next) {
  84          intel_batchbuffer_reset_to_saved(brw);
  85          intel_batchbuffer_flush(brw);
  86          fail_next = true;
  87          goto retry;
  88       } else {
  89          if (intel_batchbuffer_flush(brw) == -ENOSPC) {
  90             static bool warned = false;
  91
  92             if (!warned) {
  93                fprintf(stderr, "i965: Single compute shader dispatch "
  94                        "exceeded available aperture space\n");
  95                warned = true;
  96             }
  97          }
  98       }
  99    }
 100
 101    /* Now that we know we haven't run out of aperture space, we can safely
 102     * reset the dirty bits.
 103     */
 104    brw_compute_state_finished(brw);
 105
 106    if (brw->always_flush_batch)
 107       intel_batchbuffer_flush(brw);
 108
 109    brw_state_cache_check_size(brw);
 110
 111    /* Note: since compute shaders can't write to framebuffers, there's no need
 112     * to call brw_postdraw_set_buffers_need_resolve().
 113     */
 114 }
 115
 116
 117 void
 118 brw_init_compute_functions(struct dd_function_table *functions)
 119 {
 120    functions->DispatchCompute = brw_dispatch_compute;
 121 }