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/*
* Copyright © 2011 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "main/macros.h"
#include "intel_batchbuffer.h"
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "common/gen_l3_config.h"
/**
* The following diagram shows how we partition the URB:
*
* 16kB or 32kB Rest of the URB space
* __________-__________ _________________-_________________
* / \ / \
* +-------------------------------------------------------------+
* | VS/HS/DS/GS/FS Push | VS/HS/DS/GS URB |
* | Constants | Entries |
* +-------------------------------------------------------------+
*
* Notably, push constants must be stored at the beginning of the URB
* space, while entries can be stored anywhere. Ivybridge and Haswell
* GT1/GT2 have a maximum constant buffer size of 16kB, while Haswell GT3
* doubles this (32kB).
*
* Ivybridge and Haswell GT1/GT2 allow push constants to be located (and
* sized) in increments of 1kB. Haswell GT3 requires them to be located and
* sized in increments of 2kB.
*
* Currently we split the constant buffer space evenly among whatever stages
* are active. This is probably not ideal, but simple.
*
* Ivybridge GT1 and Haswell GT1 have 128kB of URB space.
* Ivybridge GT2 and Haswell GT2 have 256kB of URB space.
* Haswell GT3 has 512kB of URB space.
*
* See "Volume 2a: 3D Pipeline," section 1.8, "Volume 1b: Configurations",
* and the documentation for 3DSTATE_PUSH_CONSTANT_ALLOC_xS.
*/
static void
gen7_allocate_push_constants(struct brw_context *brw)
{
/* BRW_NEW_GEOMETRY_PROGRAM */
bool gs_present = brw->geometry_program;
/* BRW_NEW_TESS_PROGRAMS */
bool tess_present = brw->tess_eval_program;
unsigned avail_size = 16;
unsigned multiplier =
(brw->gen >= 8 || (brw->is_haswell && brw->gt == 3)) ? 2 : 1;
int stages = 2 + gs_present + 2 * tess_present;
/* Divide up the available space equally between stages. Because we
* round down (using floor division), there may be some left over
* space. We allocate that to the pixel shader stage.
*/
unsigned size_per_stage = avail_size / stages;
unsigned vs_size = size_per_stage;
unsigned hs_size = tess_present ? size_per_stage : 0;
unsigned ds_size = tess_present ? size_per_stage : 0;
unsigned gs_size = gs_present ? size_per_stage : 0;
unsigned fs_size = avail_size - size_per_stage * (stages - 1);
gen7_emit_push_constant_state(brw, multiplier * vs_size,
multiplier * hs_size, multiplier * ds_size,
multiplier * gs_size, multiplier * fs_size);
/* From p115 of the Ivy Bridge PRM (3.2.1.4 3DSTATE_PUSH_CONSTANT_ALLOC_VS):
*
* Programming Restriction:
*
* The 3DSTATE_CONSTANT_VS must be reprogrammed prior to the next
* 3DPRIMITIVE command after programming the
* 3DSTATE_PUSH_CONSTANT_ALLOC_VS.
*
* Similar text exists for the other 3DSTATE_PUSH_CONSTANT_ALLOC_*
* commands.
*/
brw->ctx.NewDriverState |= BRW_NEW_PUSH_CONSTANT_ALLOCATION;
}
void
gen7_emit_push_constant_state(struct brw_context *brw, unsigned vs_size,
unsigned hs_size, unsigned ds_size,
unsigned gs_size, unsigned fs_size)
{
unsigned offset = 0;
BEGIN_BATCH(10);
OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_VS << 16 | (2 - 2));
OUT_BATCH(vs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
offset += vs_size;
OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_HS << 16 | (2 - 2));
OUT_BATCH(hs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
offset += hs_size;
OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_DS << 16 | (2 - 2));
OUT_BATCH(ds_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
offset += ds_size;
OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_GS << 16 | (2 - 2));
OUT_BATCH(gs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
offset += gs_size;
OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_PS << 16 | (2 - 2));
OUT_BATCH(fs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);
ADVANCE_BATCH();
/* From p292 of the Ivy Bridge PRM (11.2.4 3DSTATE_PUSH_CONSTANT_ALLOC_PS):
*
* A PIPE_CONTROL command with the CS Stall bit set must be programmed
* in the ring after this instruction.
*
* No such restriction exists for Haswell or Baytrail.
*/
if (brw->gen < 8 && !brw->is_haswell && !brw->is_baytrail)
gen7_emit_cs_stall_flush(brw);
}
const struct brw_tracked_state gen7_push_constant_space = {
.dirty = {
.mesa = 0,
.brw = BRW_NEW_CONTEXT |
BRW_NEW_GEOMETRY_PROGRAM |
BRW_NEW_TESS_PROGRAMS,
},
.emit = gen7_allocate_push_constants,
};
static void
upload_urb(struct brw_context *brw)
{
/* BRW_NEW_VS_PROG_DATA */
const struct brw_vue_prog_data *vs_vue_prog_data =
brw_vue_prog_data(brw->vs.base.prog_data);
const unsigned vs_size = MAX2(vs_vue_prog_data->urb_entry_size, 1);
/* BRW_NEW_GS_PROG_DATA */
const bool gs_present = brw->gs.base.prog_data;
/* BRW_NEW_TES_PROG_DATA */
const bool tess_present = brw->tes.base.prog_data;
gen7_upload_urb(brw, vs_size, gs_present, tess_present);
}
void
gen7_upload_urb(struct brw_context *brw, unsigned vs_size,
bool gs_present, bool tess_present)
{
const struct gen_device_info *devinfo = &brw->screen->devinfo;
const int push_size_kB =
(brw->gen >= 8 || (brw->is_haswell && brw->gt == 3)) ? 32 : 16;
/* BRW_NEW_{VS,TCS,TES,GS}_PROG_DATA */
struct brw_vue_prog_data *prog_data[4] = {
[MESA_SHADER_VERTEX] =
brw_vue_prog_data(brw->vs.base.prog_data),
[MESA_SHADER_TESS_CTRL] =
tess_present ? brw_vue_prog_data(brw->tcs.base.prog_data) : NULL,
[MESA_SHADER_TESS_EVAL] =
tess_present ? brw_vue_prog_data(brw->tes.base.prog_data) : NULL,
[MESA_SHADER_GEOMETRY] =
gs_present ? brw_vue_prog_data(brw->gs.base.prog_data) : NULL,
};
unsigned entry_size[4];
entry_size[MESA_SHADER_VERTEX] = vs_size;
for (int i = MESA_SHADER_TESS_CTRL; i <= MESA_SHADER_GEOMETRY; i++) {
entry_size[i] = prog_data[i] ? prog_data[i]->urb_entry_size : 1;
}
/* If we're just switching between programs with the same URB requirements,
* skip the rest of the logic.
*/
if (!(brw->ctx.NewDriverState & BRW_NEW_CONTEXT) &&
!(brw->ctx.NewDriverState & BRW_NEW_URB_SIZE) &&
brw->urb.vsize == entry_size[MESA_SHADER_VERTEX] &&
brw->urb.gs_present == gs_present &&
brw->urb.gsize == entry_size[MESA_SHADER_GEOMETRY] &&
brw->urb.tess_present == tess_present &&
brw->urb.hsize == entry_size[MESA_SHADER_TESS_CTRL] &&
brw->urb.dsize == entry_size[MESA_SHADER_TESS_EVAL]) {
return;
}
brw->urb.vsize = entry_size[MESA_SHADER_VERTEX];
brw->urb.gs_present = gs_present;
brw->urb.gsize = entry_size[MESA_SHADER_GEOMETRY];
brw->urb.tess_present = tess_present;
brw->urb.hsize = entry_size[MESA_SHADER_TESS_CTRL];
brw->urb.dsize = entry_size[MESA_SHADER_TESS_EVAL];
unsigned entries[4];
unsigned start[4];
gen_get_urb_config(devinfo, 1024 * push_size_kB, 1024 * brw->urb.size,
tess_present, gs_present, entry_size, entries, start);
if (brw->gen == 7 && !brw->is_haswell && !brw->is_baytrail)
gen7_emit_vs_workaround_flush(brw);
BEGIN_BATCH(8);
for (int i = MESA_SHADER_VERTEX; i <= MESA_SHADER_GEOMETRY; i++) {
OUT_BATCH((_3DSTATE_URB_VS + i) << 16 | (2 - 2));
OUT_BATCH(entries[i] |
((entry_size[i] - 1) << GEN7_URB_ENTRY_SIZE_SHIFT) |
(start[i] << GEN7_URB_STARTING_ADDRESS_SHIFT));
}
ADVANCE_BATCH();
}
const struct brw_tracked_state gen7_urb = {
.dirty = {
.mesa = 0,
.brw = BRW_NEW_CONTEXT |
BRW_NEW_URB_SIZE |
BRW_NEW_GS_PROG_DATA |
BRW_NEW_TCS_PROG_DATA |
BRW_NEW_TES_PROG_DATA |
BRW_NEW_VS_PROG_DATA,
},
.emit = upload_urb,
};
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