| /* |
| * 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. |
| */ |
| #include "main/imports.h" |
| |
| #include "brw_context.h" |
| #include "brw_defines.h" |
| #include "brw_state.h" |
| #include "intel_batchbuffer.h" |
| |
| /** |
| * Emit PIPE_CONTROLs to write the current GPU timestamp into a buffer. |
| */ |
| void |
| brw_write_timestamp(struct brw_context *brw, drm_intel_bo *query_bo, int idx) |
| { |
| if (brw->gen == 6) { |
| /* Emit Sandybridge workaround flush: */ |
| brw_emit_pipe_control_flush(brw, |
| PIPE_CONTROL_CS_STALL | |
| PIPE_CONTROL_STALL_AT_SCOREBOARD); |
| } |
| |
| uint32_t flags = PIPE_CONTROL_WRITE_TIMESTAMP; |
| |
| if (brw->gen == 9 && brw->gt == 4) |
| flags |= PIPE_CONTROL_CS_STALL; |
| |
| brw_emit_pipe_control_write(brw, flags, |
| query_bo, idx * sizeof(uint64_t), 0, 0); |
| } |
| |
| /** |
| * Emit PIPE_CONTROLs to write the PS_DEPTH_COUNT register into a buffer. |
| */ |
| void |
| brw_write_depth_count(struct brw_context *brw, drm_intel_bo *query_bo, int idx) |
| { |
| uint32_t flags = PIPE_CONTROL_WRITE_DEPTH_COUNT | PIPE_CONTROL_DEPTH_STALL; |
| |
| if (brw->gen == 9 && brw->gt == 4) |
| flags |= PIPE_CONTROL_CS_STALL; |
| |
| brw_emit_pipe_control_write(brw, flags, |
| query_bo, idx * sizeof(uint64_t), |
| 0, 0); |
| } |
| |
| /** |
| * Wait on the query object's BO and calculate the final result. |
| */ |
| static void |
| brw_queryobj_get_results(struct gl_context *ctx, |
| struct brw_query_object *query) |
| { |
| struct brw_context *brw = brw_context(ctx); |
| |
| int i; |
| uint64_t *results; |
| |
| assert(brw->gen < 6); |
| |
| if (query->bo == NULL) |
| return; |
| |
| /* If the application has requested the query result, but this batch is |
| * still contributing to it, flush it now so the results will be present |
| * when mapped. |
| */ |
| if (drm_intel_bo_references(brw->batch.bo, query->bo)) |
| intel_batchbuffer_flush(brw); |
| |
| if (unlikely(brw->perf_debug)) { |
| 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: |
| /* The query BO contains the starting and ending timestamps. |
| * Subtract the two and convert to nanoseconds. |
| */ |
| query->Base.Result += 1000 * ((results[1] >> 32) - (results[0] >> 32)); |
| break; |
| |
| case GL_TIMESTAMP: |
| /* The query BO contains a single timestamp value in results[0]. */ |
| query->Base.Result = 1000 * (results[0] >> 32); |
| break; |
| |
| case GL_SAMPLES_PASSED_ARB: |
| /* Loop over pairs of values from the BO, which are the PS_DEPTH_COUNT |
| * value at the start and end of the batchbuffer. Subtract them to |
| * get the number of fragments which passed the depth test in each |
| * individual batch, and add those differences up to get the number |
| * of fragments for the entire query. |
| * |
| * Note that query->Base.Result may already be non-zero. We may have |
| * run out of space in the query's BO and allocated a new one. If so, |
| * this function was already called to accumulate the results so far. |
| */ |
| for (i = 0; i < query->last_index; i++) { |
| query->Base.Result += results[i * 2 + 1] - results[i * 2]; |
| } |
| break; |
| |
| case GL_ANY_SAMPLES_PASSED: |
| case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: |
| /* If the starting and ending PS_DEPTH_COUNT from any of the batches |
| * differ, then some fragments passed the depth test. |
| */ |
| for (i = 0; i < query->last_index; i++) { |
| if (results[i * 2 + 1] != results[i * 2]) { |
| query->Base.Result = GL_TRUE; |
| break; |
| } |
| } |
| 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; |
| } |
| |
| /** |
| * The NewQueryObject() driver hook. |
| * |
| * Allocates and initializes a new query object. |
| */ |
| 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; |
| } |
| |
| /** |
| * The DeleteQuery() driver hook. |
| */ |
| 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); |
| } |
| |
| /** |
| * Gen4-5 driver hook for glBeginQuery(). |
| * |
| * Initializes driver structures and emits any GPU commands required to begin |
| * recording data for the query. |
| */ |
| static void |
| brw_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; |
| |
| assert(brw->gen < 6); |
| |
| switch (query->Base.Target) { |
| case GL_TIME_ELAPSED_EXT: |
| /* 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. |
| */ |
| drm_intel_bo_unreference(query->bo); |
| query->bo = drm_intel_bo_alloc(brw->bufmgr, "timer query", 4096, 4096); |
| brw_write_timestamp(brw, query->bo, 0); |
| break; |
| |
| case GL_ANY_SAMPLES_PASSED: |
| case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: |
| case GL_SAMPLES_PASSED_ARB: |
| /* For occlusion queries, we delay taking an initial sample until the |
| * first drawing occurs in this batch. See the reasoning in the comments |
| * for brw_emit_query_begin() below. |
| * |
| * Since we're starting a new query, we need to be sure to throw away |
| * any previous occlusion query results. |
| */ |
| drm_intel_bo_unreference(query->bo); |
| query->bo = NULL; |
| query->last_index = -1; |
| |
| brw->query.obj = query; |
| |
| /* Depth statistics on Gen4 require strange workarounds, so we try to |
| * avoid them when necessary. They're required for occlusion queries, |
| * so turn them on now. |
| */ |
| brw->stats_wm++; |
| brw->ctx.NewDriverState |= BRW_NEW_STATS_WM; |
| break; |
| |
| default: |
| unreachable("Unrecognized query target in brw_begin_query()"); |
| } |
| } |
| |
| /** |
| * Gen4-5 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 |
| brw_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; |
| |
| assert(brw->gen < 6); |
| |
| switch (query->Base.Target) { |
| case GL_TIME_ELAPSED_EXT: |
| /* Write the final timestamp. */ |
| brw_write_timestamp(brw, query->bo, 1); |
| break; |
| |
| case GL_ANY_SAMPLES_PASSED: |
| case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: |
| case GL_SAMPLES_PASSED_ARB: |
| |
| /* No query->bo means that EndQuery was called after BeginQuery with no |
| * intervening drawing. Rather than doing nothing at all here in this |
| * case, we emit the query_begin and query_end state to the |
| * hardware. This is to guarantee that waiting on the result of this |
| * empty state will cause all previous queries to complete at all, as |
| * required by the specification: |
| * |
| * It must always be true that if any query object |
| * returns a result available of TRUE, all queries of the |
| * same type issued prior to that query must also return |
| * TRUE. [Open GL 4.3 (Core Profile) Section 4.2.1] |
| */ |
| if (!query->bo) { |
| brw_emit_query_begin(brw); |
| } |
| |
| assert(query->bo); |
| |
| brw_emit_query_end(brw); |
| |
| brw->query.obj = NULL; |
| |
| brw->stats_wm--; |
| brw->ctx.NewDriverState |= BRW_NEW_STATS_WM; |
| break; |
| |
| default: |
| unreachable("Unrecognized query target in brw_end_query()"); |
| } |
| } |
| |
| /** |
| * The Gen4-5 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 brw_wait_query(struct gl_context *ctx, struct gl_query_object *q) |
| { |
| struct brw_query_object *query = (struct brw_query_object *)q; |
| |
| assert(brw_context(ctx)->gen < 6); |
| |
| brw_queryobj_get_results(ctx, query); |
| query->Base.Ready = true; |
| } |
| |
| /** |
| * The Gen4-5 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 brw_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; |
| |
| assert(brw->gen < 6); |
| |
| /* 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. |
| */ |
| if (query->bo && drm_intel_bo_references(brw->batch.bo, query->bo)) |
| intel_batchbuffer_flush(brw); |
| |
| if (query->bo == NULL || !drm_intel_bo_busy(query->bo)) { |
| brw_queryobj_get_results(ctx, query); |
| query->Base.Ready = true; |
| } |
| } |
| |
| /** |
| * Ensure there query's BO has enough space to store a new pair of values. |
| * |
| * If not, gather the existing BO's results and create a new buffer of the |
| * same size. |
| */ |
| static void |
| ensure_bo_has_space(struct gl_context *ctx, struct brw_query_object *query) |
| { |
| struct brw_context *brw = brw_context(ctx); |
| |
| assert(brw->gen < 6); |
| |
| if (!query->bo || query->last_index * 2 + 1 >= 4096 / sizeof(uint64_t)) { |
| |
| if (query->bo != NULL) { |
| /* The old query BO did not have enough space, so we allocated a new |
| * one. Gather the results so far (adding up the differences) and |
| * release the old BO. |
| */ |
| brw_queryobj_get_results(ctx, query); |
| } |
| |
| query->bo = drm_intel_bo_alloc(brw->bufmgr, "query", 4096, 1); |
| query->last_index = 0; |
| } |
| } |
| |
| /** |
| * Record the PS_DEPTH_COUNT value (for occlusion queries) just before |
| * primitive drawing. |
| * |
| * In a pre-hardware context world, the single PS_DEPTH_COUNT register is |
| * shared among all applications using the GPU. However, our query value |
| * needs to only include fragments generated by our application/GL context. |
| * |
| * To accommodate this, we record PS_DEPTH_COUNT at the start and end of |
| * each batchbuffer (technically, the first primitive drawn and flush time). |
| * Subtracting each pair of values calculates the change in PS_DEPTH_COUNT |
| * caused by a batchbuffer. Since there is no preemption inside batches, |
| * this is guaranteed to only measure the effects of our current application. |
| * |
| * Adding each of these differences (in case drawing is done over many batches) |
| * produces the final expected value. |
| * |
| * In a world with hardware contexts, PS_DEPTH_COUNT is saved and restored |
| * as part of the context state, so this is unnecessary, and skipped. |
| */ |
| void |
| brw_emit_query_begin(struct brw_context *brw) |
| { |
| struct gl_context *ctx = &brw->ctx; |
| struct brw_query_object *query = brw->query.obj; |
| |
| if (brw->hw_ctx) |
| return; |
| |
| /* Skip if we're not doing any queries, or we've already recorded the |
| * initial query value for this batchbuffer. |
| */ |
| if (!query || brw->query.begin_emitted) |
| return; |
| |
| ensure_bo_has_space(ctx, query); |
| |
| brw_write_depth_count(brw, query->bo, query->last_index * 2); |
| |
| brw->query.begin_emitted = true; |
| } |
| |
| /** |
| * Called at batchbuffer flush to get an ending PS_DEPTH_COUNT |
| * (for non-hardware context platforms). |
| * |
| * See the explanation in brw_emit_query_begin(). |
| */ |
| void |
| brw_emit_query_end(struct brw_context *brw) |
| { |
| struct brw_query_object *query = brw->query.obj; |
| |
| if (brw->hw_ctx) |
| return; |
| |
| if (!brw->query.begin_emitted) |
| return; |
| |
| brw_write_depth_count(brw, query->bo, query->last_index * 2 + 1); |
| |
| brw->query.begin_emitted = false; |
| query->last_index++; |
| } |
| |
| /** |
| * Driver hook for glQueryCounter(). |
| * |
| * This handles GL_TIMESTAMP queries, which perform a pipelined read of the |
| * current GPU time. This is unlike GL_TIME_ELAPSED, which measures the |
| * time while the query is active. |
| */ |
| void |
| brw_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; |
| |
| assert(q->Target == GL_TIMESTAMP); |
| |
| drm_intel_bo_unreference(query->bo); |
| query->bo = drm_intel_bo_alloc(brw->bufmgr, "timestamp query", 4096, 4096); |
| brw_write_timestamp(brw, query->bo, 0); |
| |
| query->flushed = false; |
| } |
| |
| /** |
| * Read the TIMESTAMP register immediately (in a non-pipelined fashion). |
| * |
| * This is used to implement the GetTimestamp() driver hook. |
| */ |
| static uint64_t |
| brw_get_timestamp(struct gl_context *ctx) |
| { |
| struct brw_context *brw = brw_context(ctx); |
| uint64_t result = 0; |
| |
| switch (brw->screen->hw_has_timestamp) { |
| case 3: /* New kernel, always full 36bit accuracy */ |
| drm_intel_reg_read(brw->bufmgr, TIMESTAMP | 1, &result); |
| break; |
| case 2: /* 64bit kernel, result is left-shifted by 32bits, losing 4bits */ |
| drm_intel_reg_read(brw->bufmgr, TIMESTAMP, &result); |
| result = result >> 32; |
| break; |
| case 1: /* 32bit kernel, result is 36bit wide but may be inaccurate! */ |
| drm_intel_reg_read(brw->bufmgr, TIMESTAMP, &result); |
| break; |
| } |
| |
| /* See logic in brw_queryobj_get_results() */ |
| result *= 80; |
| result &= (1ull << 36) - 1; |
| return result; |
| } |
| |
| /** |
| * Is this type of query written by PIPE_CONTROL? |
| */ |
| bool |
| brw_is_query_pipelined(struct brw_query_object *query) |
| { |
| switch (query->Base.Target) { |
| case GL_TIMESTAMP: |
| case GL_TIME_ELAPSED: |
| case GL_ANY_SAMPLES_PASSED: |
| case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: |
| case GL_SAMPLES_PASSED_ARB: |
| return true; |
| |
| 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_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: |
| return false; |
| |
| default: |
| unreachable("Unrecognized query target in is_query_pipelined()"); |
| } |
| } |
| |
| /* Initialize query object functions used on all generations. */ |
| void brw_init_common_queryobj_functions(struct dd_function_table *functions) |
| { |
| functions->NewQueryObject = brw_new_query_object; |
| functions->DeleteQuery = brw_delete_query; |
| functions->GetTimestamp = brw_get_timestamp; |
| } |
| |
| /* Initialize Gen4/5-specific query object functions. */ |
| void gen4_init_queryobj_functions(struct dd_function_table *functions) |
| { |
| functions->BeginQuery = brw_begin_query; |
| functions->EndQuery = brw_end_query; |
| functions->CheckQuery = brw_check_query; |
| functions->WaitQuery = brw_wait_query; |
| functions->QueryCounter = brw_query_counter; |
| } |