/*
* 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>
* Kenneth Graunke <kenneth@whitecape.org>
*/
/** @file gen6_queryobj.c
*
* Support for query objects (GL_ARB_occlusion_query, GL_ARB_timer_query,
* GL_EXT_transform_feedback, and friends) on platforms that support
* hardware contexts (Gen6+).
*/
#include "main/imports.h"
#include "brw_context.h"
#include "brw_defines.h"
#include "brw_state.h"
#include "intel_batchbuffer.h"
#include "intel_buffer_objects.h"
static inline void
set_query_availability(struct brw_context *brw, struct brw_query_object *query,
bool available)
{
/* For platforms that support ARB_query_buffer_object, we write the
* query availability for "pipelined" queries.
*
* Most counter snapshots are written by the command streamer, by
* doing a CS stall and then MI_STORE_REGISTER_MEM. For these
* counters, the CS stall guarantees that the results will be
* available when subsequent CS commands run. So we don't need to
* do any additional tracking.
*
* Other counters (occlusion queries and timestamp) are written by
* PIPE_CONTROL, without a CS stall. This means that we can't be
* sure whether the writes have landed yet or not. Performing a
* PIPE_CONTROL with an immediate write will synchronize with
* those earlier writes, so we write 1 when the value has landed.
*/
if (brw->ctx.Extensions.ARB_query_buffer_object &&
brw_is_query_pipelined(query)) {
brw_emit_pipe_control_write(brw,
PIPE_CONTROL_WRITE_IMMEDIATE,
query->bo, 2 * sizeof(uint64_t),
available, 0);
}
}
static void
write_primitives_generated(struct brw_context *brw,
drm_intel_bo *query_bo, int stream, int idx)
{
brw_emit_mi_flush(brw);
if (brw->gen >= 7 && stream > 0) {
brw_store_register_mem64(brw, query_bo,
GEN7_SO_PRIM_STORAGE_NEEDED(stream),
idx * sizeof(uint64_t));
} else {
brw_store_register_mem64(brw, query_bo, CL_INVOCATION_COUNT,
idx * sizeof(uint64_t));
}
}
static void
write_xfb_primitives_written(struct brw_context *brw,
drm_intel_bo *bo, int stream, int idx)
{
brw_emit_mi_flush(brw);
if (brw->gen >= 7) {
brw_store_register_mem64(brw, bo, GEN7_SO_NUM_PRIMS_WRITTEN(stream),
idx * sizeof(uint64_t));
} else {
brw_store_register_mem64(brw, bo, GEN6_SO_NUM_PRIMS_WRITTEN,
idx * sizeof(uint64_t));
}
}
static inline int
pipeline_target_to_index(int target)
{
if (target == GL_GEOMETRY_SHADER_INVOCATIONS)
return MAX_PIPELINE_STATISTICS - 1;
else
return target - GL_VERTICES_SUBMITTED_ARB;
}
static void
emit_pipeline_stat(struct brw_context *brw, drm_intel_bo *bo,
int stream, int target, int idx)
{
/* One source of confusion is the tessellation shader statistics. The
* hardware has no statistics specific to the TE unit. Ideally we could have
* the HS primitives for TESS_CONTROL_SHADER_PATCHES_ARB, and the DS
* invocations as the register for TESS_CONTROL_SHADER_PATCHES_ARB.
* Unfortunately we don't have HS primitives, we only have HS invocations.
*/
/* Everything except GEOMETRY_SHADER_INVOCATIONS can be kept in a simple
* lookup table
*/
static const uint32_t target_to_register[] = {
IA_VERTICES_COUNT, /* VERTICES_SUBMITTED */
IA_PRIMITIVES_COUNT, /* PRIMITIVES_SUBMITTED */
VS_INVOCATION_COUNT, /* VERTEX_SHADER_INVOCATIONS */
HS_INVOCATION_COUNT, /* TESS_CONTROL_SHADER_PATCHES */
DS_INVOCATION_COUNT, /* TESS_EVALUATION_SHADER_INVOCATIONS */
GS_PRIMITIVES_COUNT, /* GEOMETRY_SHADER_PRIMITIVES_EMITTED */
PS_INVOCATION_COUNT, /* FRAGMENT_SHADER_INVOCATIONS */
CS_INVOCATION_COUNT, /* COMPUTE_SHADER_INVOCATIONS */
CL_INVOCATION_COUNT, /* CLIPPING_INPUT_PRIMITIVES */
CL_PRIMITIVES_COUNT, /* CLIPPING_OUTPUT_PRIMITIVES */
GS_INVOCATION_COUNT /* This one is special... */
};
STATIC_ASSERT(ARRAY_SIZE(target_to_register) == MAX_PIPELINE_STATISTICS);
uint32_t reg = target_to_register[pipeline_target_to_index(target)];
/* Gen6 GS code counts full primitives, that is, it won't count individual
* triangles in a triangle strip. Use CL_INVOCATION_COUNT for that.
*/
if (brw->gen == 6 && target == GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB)
reg = CL_INVOCATION_COUNT;
assert(reg != 0);
/* Emit a flush to make sure various parts of the pipeline are complete and
* we get an accurate value
*/
brw_emit_mi_flush(brw);
brw_store_register_mem64(brw, bo, reg, idx * sizeof(uint64_t));
}
/**
* Wait on the query object's BO and calculate the final result.
*/
static void
gen6_queryobj_get_results(struct gl_context *ctx,
struct brw_query_object *query)
{
struct brw_context *brw = brw_context(ctx);
if (query->bo == NULL)
return;
brw_bo_map(brw, query->bo, false, "query object");
uint64_t *results = query->bo->virtual;
switch (query->Base.Target) {
case GL_TIME_ELAPSED:
/* The query BO contains the starting and ending timestamps.
* Subtract the two and convert to nanoseconds.
*/
query->Base.Result += 80 * (results[1] - results[0]);
break;
case GL_TIMESTAMP:
/* 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.
*
* The query BO contains a single timestamp value in results[0].
*/
query->Base.Result = 80 * (results[0] & 0xffffffff);
query->Base.Result &= (1ull << 36) - 1;
break;
case GL_SAMPLES_PASSED_ARB:
/* We need to use += rather than = here since some BLT-based operations
* may have added additional samples to our occlusion query value.
*/
query->Base.Result += results[1] - results[0];
break;
case GL_ANY_SAMPLES_PASSED:
case GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
if (results[0] != results[1])
query->Base.Result = true;
break;
case GL_PRIMITIVES_GENERATED:
case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
case GL_VERTICES_SUBMITTED_ARB:
case GL_PRIMITIVES_SUBMITTED_ARB:
case GL_VERTEX_SHADER_INVOCATIONS_ARB:
case GL_GEOMETRY_SHADER_INVOCATIONS:
case GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB:
case GL_CLIPPING_INPUT_PRIMITIVES_ARB:
case GL_CLIPPING_OUTPUT_PRIMITIVES_ARB:
case GL_COMPUTE_SHADER_INVOCATIONS_ARB:
case GL_TESS_CONTROL_SHADER_PATCHES_ARB:
case GL_TESS_EVALUATION_SHADER_INVOCATIONS_ARB:
query->Base.Result = results[1] - results[0];
break;
case GL_FRAGMENT_SHADER_INVOCATIONS_ARB:
query->Base.Result = (results[1] - results[0]);
/* Implement the "WaDividePSInvocationCountBy4:HSW,BDW" workaround:
* "Invocation counter is 4 times actual. WA: SW to divide HW reported
* PS Invocations value by 4."
*
* Prior to Haswell, invocation count was counted by the WM, and it
* buggily counted invocations in units of subspans (2x2 unit). To get the
* correct value, the CS multiplied this by 4. With HSW the logic moved,
* and correctly emitted the number of pixel shader invocations, but,
* whomever forgot to undo the multiply by 4.
*/
if (brw->gen == 8 || brw->is_haswell)
query->Base.Result /= 4;
break;
default:
unreachable("Unrecognized query target in brw_queryobj_get_results()");
}
drm_intel_bo_unmap(query->bo);
/* Now that we've processed the data stored in the query's buffer object,
* we can release it.
*/
drm_intel_bo_unreference(query->bo);
query->bo = NULL;
query->Base.Ready = true;
}
/**
* Driver hook for glBeginQuery().
*
* Initializes driver structures and emits any GPU commands required to begin
* recording data for the query.
*/
static void
gen6_begin_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_context *brw = brw_context(ctx);
struct brw_query_object *query = (struct brw_query_object *)q;
/* Since we're starting a new query, we need to throw away old results. */
drm_intel_bo_unreference(query->bo);
query->bo = drm_intel_bo_alloc(brw->bufmgr, "query results", 4096, 4096);
/* For ARB_query_buffer_object: The result is not available */
set_query_availability(brw, query, false);
switch (query->Base.Target) {
case GL_TIME_ELAPSED:
/* For timestamp queries, we record the starting time right away so that
* we measure the full time between BeginQuery and EndQuery. There's
* some debate about whether this is the right thing to do. Our decision
* is based on the following text from the ARB_timer_query extension:
*
* "(5) Should the extension measure total time elapsed between the full
* completion of the BeginQuery and EndQuery commands, or just time
* spent in the graphics library?
*
* RESOLVED: This extension will measure the total time elapsed
* between the full completion of these commands. Future extensions
* may implement a query to determine time elapsed at different stages
* of the graphics pipeline."
*
* We write a starting timestamp now (at index 0). At EndQuery() time,
* we'll write a second timestamp (at index 1), and subtract the two to
* obtain the time elapsed. Notably, this includes time elapsed while
* the system was doing other work, such as running other applications.
*/
brw_write_timestamp(brw, query->bo, 0);
break;
case GL_ANY_SAMPLES_PASSED:
case GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
case GL_SAMPLES_PASSED_ARB:
brw_write_depth_count(brw, query->bo, 0);
break;
case GL_PRIMITIVES_GENERATED:
write_primitives_generated(brw, query->bo, query->Base.Stream, 0);
if (query->Base.Stream == 0)
ctx->NewDriverState |= BRW_NEW_RASTERIZER_DISCARD;
break;
case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
write_xfb_primitives_written(brw, query->bo, query->Base.Stream, 0);
break;
case GL_VERTICES_SUBMITTED_ARB:
case GL_PRIMITIVES_SUBMITTED_ARB:
case GL_VERTEX_SHADER_INVOCATIONS_ARB:
case GL_GEOMETRY_SHADER_INVOCATIONS:
case GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB:
case GL_FRAGMENT_SHADER_INVOCATIONS_ARB:
case GL_CLIPPING_INPUT_PRIMITIVES_ARB:
case GL_CLIPPING_OUTPUT_PRIMITIVES_ARB:
case GL_COMPUTE_SHADER_INVOCATIONS_ARB:
case GL_TESS_CONTROL_SHADER_PATCHES_ARB:
case GL_TESS_EVALUATION_SHADER_INVOCATIONS_ARB:
emit_pipeline_stat(brw, query->bo, query->Base.Stream, query->Base.Target, 0);
break;
default:
unreachable("Unrecognized query target in brw_begin_query()");
}
}
/**
* Driver hook for glEndQuery().
*
* Emits GPU commands to record a final query value, ending any data capturing.
* However, the final result isn't necessarily available until the GPU processes
* those commands. brw_queryobj_get_results() processes the captured data to
* produce the final result.
*/
static void
gen6_end_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_context *brw = brw_context(ctx);
struct brw_query_object *query = (struct brw_query_object *)q;
switch (query->Base.Target) {
case GL_TIME_ELAPSED:
brw_write_timestamp(brw, query->bo, 1);
break;
case GL_ANY_SAMPLES_PASSED:
case GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
case GL_SAMPLES_PASSED_ARB:
brw_write_depth_count(brw, query->bo, 1);
break;
case GL_PRIMITIVES_GENERATED:
write_primitives_generated(brw, query->bo, query->Base.Stream, 1);
if (query->Base.Stream == 0)
ctx->NewDriverState |= BRW_NEW_RASTERIZER_DISCARD;
break;
case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
write_xfb_primitives_written(brw, query->bo, query->Base.Stream, 1);
break;
case GL_VERTICES_SUBMITTED_ARB:
case GL_PRIMITIVES_SUBMITTED_ARB:
case GL_VERTEX_SHADER_INVOCATIONS_ARB:
case GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB:
case GL_FRAGMENT_SHADER_INVOCATIONS_ARB:
case GL_COMPUTE_SHADER_INVOCATIONS_ARB:
case GL_CLIPPING_INPUT_PRIMITIVES_ARB:
case GL_CLIPPING_OUTPUT_PRIMITIVES_ARB:
case GL_GEOMETRY_SHADER_INVOCATIONS:
case GL_TESS_CONTROL_SHADER_PATCHES_ARB:
case GL_TESS_EVALUATION_SHADER_INVOCATIONS_ARB:
emit_pipeline_stat(brw, query->bo,
query->Base.Stream, query->Base.Target, 1);
break;
default:
unreachable("Unrecognized query target in brw_end_query()");
}
/* The current batch contains the commands to handle EndQuery(),
* but they won't actually execute until it is flushed.
*/
query->flushed = false;
/* For ARB_query_buffer_object: The result is now available */
set_query_availability(brw, query, true);
}
/**
* Flush the batch if it still references the query object BO.
*/
static void
flush_batch_if_needed(struct brw_context *brw, struct brw_query_object *query)
{
/* If the batch doesn't reference the BO, it must have been flushed
* (for example, due to being full). Record that it's been flushed.
*/
query->flushed = query->flushed ||
!drm_intel_bo_references(brw->batch.bo, query->bo);
if (!query->flushed)
intel_batchbuffer_flush(brw);
}
/**
* The WaitQuery() driver hook.
*
* Wait for a query result to become available and return it. This is the
* backing for glGetQueryObjectiv() with the GL_QUERY_RESULT pname.
*/
static void gen6_wait_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_context *brw = brw_context(ctx);
struct brw_query_object *query = (struct brw_query_object *)q;
/* If the application has requested the query result, but this batch is
* still contributing to it, flush it now to finish that work so the
* result will become available (eventually).
*/
flush_batch_if_needed(brw, query);
gen6_queryobj_get_results(ctx, query);
}
/**
* The CheckQuery() driver hook.
*
* Checks whether a query result is ready yet. If not, flushes.
* This is the backing for glGetQueryObjectiv()'s QUERY_RESULT_AVAILABLE pname.
*/
static void gen6_check_query(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_context *brw = brw_context(ctx);
struct brw_query_object *query = (struct brw_query_object *)q;
/* If query->bo is NULL, we've already gathered the results - this is a
* redundant CheckQuery call. Ignore it.
*/
if (query->bo == NULL)
return;
/* From the GL_ARB_occlusion_query spec:
*
* "Instead of allowing for an infinite loop, performing a
* QUERY_RESULT_AVAILABLE_ARB will perform a flush if the result is
* not ready yet on the first time it is queried. This ensures that
* the async query will return true in finite time.
*/
flush_batch_if_needed(brw, query);
if (!drm_intel_bo_busy(query->bo)) {
gen6_queryobj_get_results(ctx, query);
}
}
static void
gen6_query_counter(struct gl_context *ctx, struct gl_query_object *q)
{
struct brw_context *brw = brw_context(ctx);
struct brw_query_object *query = (struct brw_query_object *)q;
brw_query_counter(ctx, q);
set_query_availability(brw, query, true);
}
/* Initialize Gen6+-specific query object functions. */
void gen6_init_queryobj_functions(struct dd_function_table *functions)
{
functions->BeginQuery = gen6_begin_query;
functions->EndQuery = gen6_end_query;
functions->CheckQuery = gen6_check_query;
functions->WaitQuery = gen6_wait_query;
functions->QueryCounter = gen6_query_counter;
}