/*
* Copyright © 2008 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.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
/** @file brw_queryobj.c
*
* Support for query objects (GL_ARB_occlusion_query, GL_ARB_timer_query,
* GL_EXT_transform_feedback, and friends).
*
* The hardware provides a PIPE_CONTROL command that can report the number of
* fragments that passed the depth test, or the hardware timer. They are
* appropriately synced with the stage of the pipeline for our extensions'
* needs.
*
* To avoid getting samples from another context's rendering in our results,
* we capture the counts at the start and end of every batchbuffer while the
* query is active, and sum up the differences. (We should do so for
* GL_TIME_ELAPSED as well, but don't).
*/
#include "main/imports.h"
#include "brw_context.h"
#include "brw_defines.h"
#include "brw_state.h"
#include "intel_batchbuffer.h"
#include "intel_reg.h"
static void
write_timestamp(struct intel_context *intel, drm_intel_bo *query_bo, int idx)
{
if (intel->gen >= 6) {
/* Emit workaround flushes: */
if (intel->gen == 6) {
/* The timestamp write below is a non-zero post-sync op, which on
* Gen6 necessitates a CS stall. CS stalls need stall at scoreboard
* set. See the comments for intel_emit_post_sync_nonzero_flush().
*/
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2));
OUT_BATCH(PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD);
OUT_BATCH(0);
OUT_BATCH(0);
ADVANCE_BATCH();
}
BEGIN_BATCH(5);
OUT_BATCH(_3DSTATE_PIPE_CONTROL | (5 - 2));
OUT_BATCH(PIPE_CONTROL_WRITE_TIMESTAMP);
OUT_RELOC(query_bo,
I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
PIPE_CONTROL_GLOBAL_GTT_WRITE |
idx * sizeof(uint64_t));
OUT_BATCH(0);
OUT_BATCH(0);
ADVANCE_BATCH();
} else {
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2) |
PIPE_CONTROL_WRITE_TIMESTAMP);
OUT_RELOC(query_bo,
I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
PIPE_CONTROL_GLOBAL_GTT_WRITE |
idx * sizeof(uint64_t));
OUT_BATCH(0);
OUT_BATCH(0);
ADVANCE_BATCH();
}
}
static void
write_depth_count(struct intel_context *intel, drm_intel_bo *query_bo, int idx)
{
if (intel->gen >= 6) {
/* Emit Sandybridge workaround flush: */
if (intel->gen == 6)
intel_emit_post_sync_nonzero_flush(intel);
BEGIN_BATCH(5);
OUT_BATCH(_3DSTATE_PIPE_CONTROL | (5 - 2));
OUT_BATCH(PIPE_CONTROL_DEPTH_STALL |
PIPE_CONTROL_WRITE_DEPTH_COUNT);
OUT_RELOC(query_bo,
I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
PIPE_CONTROL_GLOBAL_GTT_WRITE |
(idx * sizeof(uint64_t)));
OUT_BATCH(0);
OUT_BATCH(0);
ADVANCE_BATCH();
} else {
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2) |
PIPE_CONTROL_DEPTH_STALL |
PIPE_CONTROL_WRITE_DEPTH_COUNT);
/* This object could be mapped cacheable, but we don't have an exposed
* mechanism to support that. Since it's going uncached, tell GEM that
* we're writing to it. The usual clflush should be all that's required
* to pick up the results.
*/
OUT_RELOC(query_bo,
I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
PIPE_CONTROL_GLOBAL_GTT_WRITE |
(idx * sizeof(uint64_t)));
OUT_BATCH(0);
OUT_BATCH(0);
ADVANCE_BATCH();
}
}
/** Waits on the query object's BO and totals the results for this query */
static void
brw_queryobj_get_results(struct gl_context *ctx,
struct brw_query_object *query)
{
struct intel_context *intel = intel_context(ctx);
int i;
uint64_t *results;
if (query->bo == NULL)
return;
if (unlikely(INTEL_DEBUG & DEBUG_PERF)) {
if (drm_intel_bo_busy(query->bo)) {
perf_debug("Stalling on the GPU waiting for a query object.\n");
}
}
drm_intel_bo_map(query->bo, false);
results = query->bo->virtual;
switch (query->Base.Target) {
case GL_TIME_ELAPSED_EXT:
if (intel->gen >= 6)
query->Base.Result += 80 * (results[1] - results[0]);
else
query->Base.Result += 1000 * ((results[1] >> 32) - (results[0] >> 32));
break;
case GL_TIMESTAMP:
if (intel->gen >= 6) {
/* Our timer is a clock that increments every 80ns (regardless of
* other clock scaling in the system). The timestamp register we can
* read for glGetTimestamp() masks out the top 32 bits, so we do that
* here too to let the two counters be compared against each other.
*
* If we just multiplied that 32 bits of data by 80, it would roll
* over at a non-power-of-two, so an application couldn't use
* GL_QUERY_COUNTER_BITS to handle rollover correctly. Instead, we
* report 36 bits and truncate at that (rolling over 5 times as often
* as the HW counter), and when the 32-bit counter rolls over, it
* happens to also be at a rollover in the reported value from near
* (1<<36) to 0.
*
* The low 32 bits rolls over in ~343 seconds. Our 36-bit result
* rolls over every ~69 seconds.
*/
query->Base.Result = 80 * (results[1] & 0xffffffff);
query->Base.Result &= (1ull << 36) - 1;
} else {
query->Base.Result = 1000 * (results[1] >> 32);
}
break;
case GL_SAMPLES_PASSED_ARB:
/* Map and count the pixels from the current query BO */
for (i = query->first_index; i <= query->last_index; i++) {
query->Base.Result += results[i * 2 + 1] - results[i * 2];
}
break;
case GL_ANY_SAMPLES_PASSED:
/* Set true if any of the sub-queries passed. */
for (i = query->first_index; i <= query->last_index; i++) {
if (results[i * 2 + 1] != results[i * 2]) {
query->Base.Result = GL_TRUE;
break;
}
}
break;
case GL_PRIMITIVES_GENERATED:
case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
/* We don't actually query the hardware for this value, so query->bo
* should always be NULL and execution should never reach here.
*/
assert(!"Unreachable");
break;
default:
assert(!"Unrecognized query target in brw_queryobj_get_results()");
break;
}
drm_intel_bo_unmap(query->bo);
drm_intel_bo_unreference(query->bo);
query->bo = NULL;
}
static struct gl_query_object *
brw_new_query_object(struct gl_context *ctx, GLuint id)
{
struct brw_query_object *query;
query = calloc(1, sizeof(struct brw_query_object));
query->Base.Id = id;
query->Base.Result = 0;
query->Base.Active = false;
query->Base.Ready = true;
return &query->Base;
}
static void
brw_delete_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_query_object *query = (struct brw_query_object *)q;
drm_intel_bo_unreference(query->bo);
free(query);
}
static void
brw_begin_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_context *brw = brw_context(ctx);
struct intel_context *intel = intel_context(ctx);
struct brw_query_object *query = (struct brw_query_object *)q;
switch (query->Base.Target) {
case GL_TIME_ELAPSED_EXT:
drm_intel_bo_unreference(query->bo);
query->bo = drm_intel_bo_alloc(intel->bufmgr, "timer query", 4096, 4096);
write_timestamp(intel, query->bo, 0);
break;
case GL_ANY_SAMPLES_PASSED:
case GL_SAMPLES_PASSED_ARB:
/* Reset our driver's tracking of query state. */
drm_intel_bo_unreference(query->bo);
query->bo = NULL;
query->first_index = -1;
query->last_index = -1;
brw->query.obj = query;
intel->stats_wm++;
break;
case GL_PRIMITIVES_GENERATED:
/* We don't actually query the hardware for this value; we keep track of
* it a software counter. So just reset the counter.
*/
brw->sol.primitives_generated = 0;
brw->sol.counting_primitives_generated = true;
break;
case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
/* We don't actually query the hardware for this value; we keep track of
* it a software counter. So just reset the counter.
*/
brw->sol.primitives_written = 0;
brw->sol.counting_primitives_written = true;
break;
default:
assert(!"Unrecognized query target in brw_begin_query()");
break;
}
}
/**
* Begin the ARB_occlusion_query query on a query object.
*/
static void
brw_end_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_context *brw = brw_context(ctx);
struct intel_context *intel = intel_context(ctx);
struct brw_query_object *query = (struct brw_query_object *)q;
switch (query->Base.Target) {
case GL_TIMESTAMP:
drm_intel_bo_unreference(query->bo);
query->bo = drm_intel_bo_alloc(intel->bufmgr, "timer query",
4096, 4096);
/* FALLTHROUGH */
case GL_TIME_ELAPSED_EXT:
write_timestamp(intel, query->bo, 1);
intel_batchbuffer_flush(intel);
break;
case GL_ANY_SAMPLES_PASSED:
case GL_SAMPLES_PASSED_ARB:
/* Flush the batchbuffer in case it has writes to our query BO.
* Have later queries write to a new query BO so that further rendering
* doesn't delay the collection of our results.
*/
if (query->bo) {
brw_emit_query_end(brw);
intel_batchbuffer_flush(intel);
drm_intel_bo_unreference(brw->query.bo);
brw->query.bo = NULL;
}
brw->query.obj = NULL;
intel->stats_wm--;
break;
case GL_PRIMITIVES_GENERATED:
/* We don't actually query the hardware for this value; we keep track of
* it in a software counter. So just read the counter and store it in
* the query object.
*/
query->Base.Result = brw->sol.primitives_generated;
brw->sol.counting_primitives_generated = false;
/* And set brw->query.obj to NULL so that this query won't try to wait
* for any rendering to complete.
*/
query->bo = NULL;
break;
case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
/* We don't actually query the hardware for this value; we keep track of
* it in a software counter. So just read the counter and store it in
* the query object.
*/
query->Base.Result = brw->sol.primitives_written;
brw->sol.counting_primitives_written = false;
/* And set brw->query.obj to NULL so that this query won't try to wait
* for any rendering to complete.
*/
query->bo = NULL;
break;
default:
assert(!"Unrecognized query target in brw_end_query()");
break;
}
}
static void brw_wait_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_query_object *query = (struct brw_query_object *)q;
brw_queryobj_get_results(ctx, query);
query->Base.Ready = true;
}
static void brw_check_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_query_object *query = (struct brw_query_object *)q;
if (query->bo == NULL || !drm_intel_bo_busy(query->bo)) {
brw_queryobj_get_results(ctx, query);
query->Base.Ready = true;
}
}
/** Called to set up the query BO and account for its aperture space */
void
brw_prepare_query_begin(struct brw_context *brw)
{
struct intel_context *intel = &brw->intel;
/* Skip if we're not doing any queries. */
if (!brw->query.obj)
return;
/* Get a new query BO if we're going to need it. */
if (brw->query.bo == NULL ||
brw->query.index * 2 + 1 >= 4096 / sizeof(uint64_t)) {
drm_intel_bo_unreference(brw->query.bo);
brw->query.bo = NULL;
brw->query.bo = drm_intel_bo_alloc(intel->bufmgr, "query", 4096, 1);
/* clear target buffer */
drm_intel_bo_map(brw->query.bo, true);
memset((char *)brw->query.bo->virtual, 0, 4096);
drm_intel_bo_unmap(brw->query.bo);
brw->query.index = 0;
}
}
/** Called just before primitive drawing to get a beginning PS_DEPTH_COUNT. */
void
brw_emit_query_begin(struct brw_context *brw)
{
struct intel_context *intel = &brw->intel;
struct gl_context *ctx = &intel->ctx;
struct brw_query_object *query = brw->query.obj;
/* Skip if we're not doing any queries, or we've emitted the start. */
if (!query || brw->query.active)
return;
write_depth_count(intel, brw->query.bo, brw->query.index * 2);
if (query->bo != brw->query.bo) {
if (query->bo != NULL)
brw_queryobj_get_results(ctx, query);
drm_intel_bo_reference(brw->query.bo);
query->bo = brw->query.bo;
query->first_index = brw->query.index;
}
query->last_index = brw->query.index;
brw->query.active = true;
}
/** Called at batchbuffer flush to get an ending PS_DEPTH_COUNT */
void
brw_emit_query_end(struct brw_context *brw)
{
struct intel_context *intel = &brw->intel;
if (!brw->query.active)
return;
write_depth_count(intel, brw->query.bo, brw->query.index * 2 + 1);
brw->query.active = false;
brw->query.index++;
}
static uint64_t
brw_get_timestamp(struct gl_context *ctx)
{
struct intel_context *intel = intel_context(ctx);
uint64_t result = 0;
drm_intel_reg_read(intel->bufmgr, TIMESTAMP, &result);
/* See logic in brw_queryobj_get_results() */
result = result >> 32;
result *= 80;
result &= (1ull << 36) - 1;
return result;
}
void brw_init_queryobj_functions(struct dd_function_table *functions)
{
functions->NewQueryObject = brw_new_query_object;
functions->DeleteQuery = brw_delete_query;
functions->BeginQuery = brw_begin_query;
functions->EndQuery = brw_end_query;
functions->CheckQuery = brw_check_query;
functions->WaitQuery = brw_wait_query;
functions->GetTimestamp = brw_get_timestamp;
}