src/mesa/drivers/dri/i965/gen7_urb.c

   1 /*
   2  * Copyright © 2011 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 DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "main/macros.h"
  25 #include "intel_batchbuffer.h"
  26 #include "brw_context.h"
  27 #include "brw_state.h"
  28 #include "brw_defines.h"
  29
  30 #include "common/gen_l3_config.h"
  31
  32 /**
  33  * The following diagram shows how we partition the URB:
  34  *
  35  *        16kB or 32kB               Rest of the URB space
  36  *   __________-__________   _________________-_________________
  37  *  /                     \ /                                   \
  38  * +-------------------------------------------------------------+
  39  * |  VS/HS/DS/GS/FS Push  |           VS/HS/DS/GS URB           |
  40  * |       Constants       |               Entries               |
  41  * +-------------------------------------------------------------+
  42  *
  43  * Notably, push constants must be stored at the beginning of the URB
  44  * space, while entries can be stored anywhere.  Ivybridge and Haswell
  45  * GT1/GT2 have a maximum constant buffer size of 16kB, while Haswell GT3
  46  * doubles this (32kB).
  47  *
  48  * Ivybridge and Haswell GT1/GT2 allow push constants to be located (and
  49  * sized) in increments of 1kB.  Haswell GT3 requires them to be located and
  50  * sized in increments of 2kB.
  51  *
  52  * Currently we split the constant buffer space evenly among whatever stages
  53  * are active.  This is probably not ideal, but simple.
  54  *
  55  * Ivybridge GT1 and Haswell GT1 have 128kB of URB space.
  56  * Ivybridge GT2 and Haswell GT2 have 256kB of URB space.
  57  * Haswell GT3 has 512kB of URB space.
  58  *
  59  * See "Volume 2a: 3D Pipeline," section 1.8, "Volume 1b: Configurations",
  60  * and the documentation for 3DSTATE_PUSH_CONSTANT_ALLOC_xS.
  61  */
  62 static void
  63 gen7_allocate_push_constants(struct brw_context *brw)
  64 {
  65    /* BRW_NEW_GEOMETRY_PROGRAM */
  66    bool gs_present = brw->geometry_program;
  67
  68    /* BRW_NEW_TESS_PROGRAMS */
  69    bool tess_present = brw->tess_eval_program;
  70
  71    unsigned avail_size = 16;
  72    unsigned multiplier =
  73       (brw->gen >= 8 || (brw->is_haswell && brw->gt == 3)) ? 2 : 1;
  74
  75    int stages = 2 + gs_present + 2 * tess_present;
  76
  77    /* Divide up the available space equally between stages.  Because we
  78     * round down (using floor division), there may be some left over
  79     * space.  We allocate that to the pixel shader stage.
  80     */
  81    unsigned size_per_stage = avail_size / stages;
  82
  83    unsigned vs_size = size_per_stage;
  84    unsigned hs_size = tess_present ? size_per_stage : 0;
  85    unsigned ds_size = tess_present ? size_per_stage : 0;
  86    unsigned gs_size = gs_present ? size_per_stage : 0;
  87    unsigned fs_size = avail_size - size_per_stage * (stages - 1);
  88
  89    gen7_emit_push_constant_state(brw, multiplier * vs_size,
  90                                  multiplier * hs_size, multiplier * ds_size,
  91                                  multiplier * gs_size, multiplier * fs_size);
  92
  93    /* From p115 of the Ivy Bridge PRM (3.2.1.4 3DSTATE_PUSH_CONSTANT_ALLOC_VS):
  94     *
  95     *     Programming Restriction:
  96     *
  97     *     The 3DSTATE_CONSTANT_VS must be reprogrammed prior to the next
  98     *     3DPRIMITIVE command after programming the
  99     *     3DSTATE_PUSH_CONSTANT_ALLOC_VS.
 100     *
 101     * Similar text exists for the other 3DSTATE_PUSH_CONSTANT_ALLOC_*
 102     * commands.
 103     */
 104    brw->vs.base.push_constants_dirty = true;
 105    brw->tcs.base.push_constants_dirty = true;
 106    brw->tes.base.push_constants_dirty = true;
 107    brw->gs.base.push_constants_dirty = true;
 108    brw->wm.base.push_constants_dirty = true;
 109 }
 110
 111 void
 112 gen7_emit_push_constant_state(struct brw_context *brw, unsigned vs_size,
 113                               unsigned hs_size, unsigned ds_size,
 114                               unsigned gs_size, unsigned fs_size)
 115 {
 116    unsigned offset = 0;
 117
 118    BEGIN_BATCH(10);
 119    OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_VS << 16 | (2 - 2));
 120    OUT_BATCH(vs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
 121    offset += vs_size;
 122
 123    OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_HS << 16 | (2 - 2));
 124    OUT_BATCH(hs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
 125    offset += hs_size;
 126
 127    OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_DS << 16 | (2 - 2));
 128    OUT_BATCH(ds_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
 129    offset += ds_size;
 130
 131    OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_GS << 16 | (2 - 2));
 132    OUT_BATCH(gs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
 133    offset += gs_size;
 134
 135    OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_PS << 16 | (2 - 2));
 136    OUT_BATCH(fs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
 137    ADVANCE_BATCH();
 138
 139    /* From p292 of the Ivy Bridge PRM (11.2.4 3DSTATE_PUSH_CONSTANT_ALLOC_PS):
 140     *
 141     *     A PIPE_CONTROL command with the CS Stall bit set must be programmed
 142     *     in the ring after this instruction.
 143     *
 144     * No such restriction exists for Haswell or Baytrail.
 145     */
 146    if (brw->gen < 8 && !brw->is_haswell && !brw->is_baytrail)
 147       gen7_emit_cs_stall_flush(brw);
 148 }
 149
 150 const struct brw_tracked_state gen7_push_constant_space = {
 151    .dirty = {
 152       .mesa = 0,
 153       .brw = BRW_NEW_CONTEXT |
 154              BRW_NEW_GEOMETRY_PROGRAM |
 155              BRW_NEW_TESS_PROGRAMS,
 156    },
 157    .emit = gen7_allocate_push_constants,
 158 };
 159
 160 static void
 161 upload_urb(struct brw_context *brw)
 162 {
 163    /* BRW_NEW_VS_PROG_DATA */
 164    const struct brw_vue_prog_data *vs_vue_prog_data =
 165       brw_vue_prog_data(brw->vs.base.prog_data);
 166    const unsigned vs_size = MAX2(vs_vue_prog_data->urb_entry_size, 1);
 167    /* BRW_NEW_GS_PROG_DATA */
 168    const bool gs_present = brw->gs.base.prog_data;
 169    /* BRW_NEW_TES_PROG_DATA */
 170    const bool tess_present = brw->tes.base.prog_data;
 171
 172    gen7_upload_urb(brw, vs_size, gs_present, tess_present);
 173 }
 174
 175 void
 176 gen7_upload_urb(struct brw_context *brw, unsigned vs_size,
 177                 bool gs_present, bool tess_present)
 178 {
 179    const struct gen_device_info *devinfo = &brw->screen->devinfo;
 180    const int push_size_kB =
 181       (brw->gen >= 8 || (brw->is_haswell && brw->gt == 3)) ? 32 : 16;
 182
 183    /* BRW_NEW_{VS,TCS,TES,GS}_PROG_DATA */
 184    struct brw_vue_prog_data *prog_data[4] = {
 185       [MESA_SHADER_VERTEX] =
 186          brw_vue_prog_data(brw->vs.base.prog_data),
 187       [MESA_SHADER_TESS_CTRL] =
 188          tess_present ? brw_vue_prog_data(brw->tcs.base.prog_data) : NULL,
 189       [MESA_SHADER_TESS_EVAL] =
 190          tess_present ? brw_vue_prog_data(brw->tes.base.prog_data) : NULL,
 191       [MESA_SHADER_GEOMETRY] =
 192          gs_present ? brw_vue_prog_data(brw->gs.base.prog_data) : NULL,
 193    };
 194
 195    unsigned entry_size[4];
 196    entry_size[MESA_SHADER_VERTEX] = vs_size;
 197    for (int i = MESA_SHADER_TESS_CTRL; i <= MESA_SHADER_GEOMETRY; i++) {
 198       entry_size[i] = prog_data[i] ? prog_data[i]->urb_entry_size : 1;
 199    }
 200
 201    /* If we're just switching between programs with the same URB requirements,
 202     * skip the rest of the logic.
 203     */
 204    if (brw->urb.vsize == entry_size[MESA_SHADER_VERTEX] &&
 205        brw->urb.gs_present == gs_present &&
 206        brw->urb.gsize == entry_size[MESA_SHADER_GEOMETRY] &&
 207        brw->urb.tess_present == tess_present &&
 208        brw->urb.hsize == entry_size[MESA_SHADER_TESS_CTRL] &&
 209        brw->urb.dsize == entry_size[MESA_SHADER_TESS_EVAL]) {
 210       return;
 211    }
 212    brw->urb.vsize = entry_size[MESA_SHADER_VERTEX];
 213    brw->urb.gs_present = gs_present;
 214    brw->urb.gsize = entry_size[MESA_SHADER_GEOMETRY];
 215    brw->urb.tess_present = tess_present;
 216    brw->urb.hsize = entry_size[MESA_SHADER_TESS_CTRL];
 217    brw->urb.dsize = entry_size[MESA_SHADER_TESS_EVAL];
 218
 219    unsigned entries[4];
 220    unsigned start[4];
 221    gen_get_urb_config(devinfo, 1024 * push_size_kB, 1024 * brw->urb.size,
 222                       tess_present, gs_present, entry_size, entries, start);
 223
 224    if (brw->gen == 7 && !brw->is_haswell && !brw->is_baytrail)
 225       gen7_emit_vs_workaround_flush(brw);
 226
 227    BEGIN_BATCH(8);
 228    for (int i = MESA_SHADER_VERTEX; i <= MESA_SHADER_GEOMETRY; i++) {
 229       assert(brw->gen != 10 || entry_size[i] % 3);
 230       OUT_BATCH((_3DSTATE_URB_VS + i) << 16 | (2 - 2));
 231       OUT_BATCH(entries[i] |
 232                 ((entry_size[i] - 1) << GEN7_URB_ENTRY_SIZE_SHIFT) |
 233                 (start[i] << GEN7_URB_STARTING_ADDRESS_SHIFT));
 234    }
 235    ADVANCE_BATCH();
 236 }
 237
 238 const struct brw_tracked_state gen7_urb = {
 239    .dirty = {
 240       .mesa = 0,
 241       .brw = BRW_NEW_BLORP |
 242              BRW_NEW_CONTEXT |
 243              BRW_NEW_URB_SIZE |
 244              BRW_NEW_GS_PROG_DATA |
 245              BRW_NEW_TCS_PROG_DATA |
 246              BRW_NEW_TES_PROG_DATA |
 247              BRW_NEW_VS_PROG_DATA,
 248    },
 249    .emit = upload_urb,
 250 };