| 0,0 → 1,384 |
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| /* |
| * 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_reg.h" |
| |
| /** |
| * Emit PIPE_CONTROLs to write the current GPU timestamp into a buffer. |
| */ |
| static void |
| write_timestamp(struct brw_context *brw, drm_intel_bo *query_bo, int idx) |
| { |
| /* Emit workaround flushes: */ |
| if (brw->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(); |
| } |
| |
| /** |
| * Emit PIPE_CONTROLs to write the PS_DEPTH_COUNT register into a buffer. |
| */ |
| static void |
| write_depth_count(struct brw_context *brw, drm_intel_bo *query_bo, int idx) |
| { |
| /* Emit Sandybridge workaround flush: */ |
| if (brw->gen == 6) |
| intel_emit_post_sync_nonzero_flush(brw); |
| |
| 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(); |
| } |
| |
| /* |
| * Write an arbitrary 64-bit register to a buffer via MI_STORE_REGISTER_MEM. |
| * |
| * Only TIMESTAMP and PS_DEPTH_COUNT have special PIPE_CONTROL support; other |
| * counters have to be read via the generic MI_STORE_REGISTER_MEM. This |
| * function also performs a pipeline flush for proper synchronization. |
| */ |
| static void |
| write_reg(struct brw_context *brw, |
| drm_intel_bo *query_bo, uint32_t reg, int idx) |
| { |
| assert(brw->gen >= 6); |
| |
| intel_batchbuffer_emit_mi_flush(brw); |
| |
| /* MI_STORE_REGISTER_MEM only stores a single 32-bit value, so to |
| * read a full 64-bit register, we need to do two of them. |
| */ |
| BEGIN_BATCH(3); |
| OUT_BATCH(MI_STORE_REGISTER_MEM | (3 - 2)); |
| OUT_BATCH(reg); |
| OUT_RELOC(query_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, |
| idx * sizeof(uint64_t)); |
| ADVANCE_BATCH(); |
| |
| BEGIN_BATCH(3); |
| OUT_BATCH(MI_STORE_REGISTER_MEM | (3 - 2)); |
| OUT_BATCH(reg + sizeof(uint32_t)); |
| OUT_RELOC(query_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, |
| sizeof(uint32_t) + idx * sizeof(uint64_t)); |
| ADVANCE_BATCH(); |
| } |
| |
| static void |
| write_primitives_generated(struct brw_context *brw, |
| drm_intel_bo *query_bo, int idx) |
| { |
| write_reg(brw, query_bo, CL_INVOCATION_COUNT, idx); |
| } |
| |
| static void |
| write_xfb_primitives_written(struct brw_context *brw, |
| drm_intel_bo *query_bo, int idx) |
| { |
| if (brw->gen >= 7) { |
| write_reg(brw, query_bo, SO_NUM_PRIMS_WRITTEN0_IVB, idx); |
| } else { |
| write_reg(brw, query_bo, SO_NUM_PRIMS_WRITTEN, idx); |
| } |
| } |
| |
| /** |
| * 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; |
| |
| /* 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); |
| 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: |
| query->Base.Result = results[1] - results[0]; |
| break; |
| |
| default: |
| assert(!"Unrecognized query target in brw_queryobj_get_results()"); |
| break; |
| } |
| 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; |
| } |
| |
| /** |
| * 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); |
| |
| 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. |
| */ |
| write_timestamp(brw, query->bo, 0); |
| break; |
| |
| case GL_ANY_SAMPLES_PASSED: |
| case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: |
| case GL_SAMPLES_PASSED_ARB: |
| write_depth_count(brw, query->bo, 0); |
| break; |
| |
| case GL_PRIMITIVES_GENERATED: |
| write_primitives_generated(brw, query->bo, 0); |
| break; |
| |
| case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN: |
| write_xfb_primitives_written(brw, query->bo, 0); |
| break; |
| |
| default: |
| assert(!"Unrecognized query target in brw_begin_query()"); |
| break; |
| } |
| } |
| |
| /** |
| * 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: |
| write_timestamp(brw, query->bo, 1); |
| break; |
| |
| case GL_ANY_SAMPLES_PASSED: |
| case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: |
| case GL_SAMPLES_PASSED_ARB: |
| write_depth_count(brw, query->bo, 1); |
| break; |
| |
| case GL_PRIMITIVES_GENERATED: |
| write_primitives_generated(brw, query->bo, 1); |
| break; |
| |
| case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN: |
| write_xfb_primitives_written(brw, query->bo, 1); |
| break; |
| |
| default: |
| assert(!"Unrecognized query target in brw_end_query()"); |
| break; |
| } |
| } |
| |
| /** |
| * 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_query_object *query = (struct brw_query_object *)q; |
| |
| gen6_queryobj_get_results(ctx, query); |
| query->Base.Ready = true; |
| } |
| |
| /** |
| * 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; |
| |
| /* 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)) { |
| gen6_queryobj_get_results(ctx, query); |
| query->Base.Ready = 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; |
| } |