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IABSD.fr/xenocara/lib/mesa/src/intel/perf/intel_perf_query.c
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- lib/mesa/src/intel/perf/intel_perf_query.c
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/* * Copyright © 2019 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 <unistd.h> #include <poll.h> #include "common/intel_gem.h" #include "dev/intel_debug.h" #include "dev/intel_device_info.h" #include "perf/intel_perf.h" #include "perf/intel_perf_mdapi.h" #include "perf/intel_perf_private.h" #include "perf/intel_perf_query.h" #include "perf/intel_perf_regs.h" #include "util/compiler.h" #include "util/u_math.h" #define FILE_DEBUG_FLAG DEBUG_PERFMON #define MI_RPC_BO_SIZE (4096) #define MI_FREQ_OFFSET_BYTES (256) #define MI_PERF_COUNTERS_OFFSET_BYTES (260) #define MAP_READ (1 << 0) #define MAP_WRITE (1 << 1) /** * Periodic OA samples are read() into these buffer structures via the * i915 perf kernel interface and appended to the * perf_ctx->sample_buffers linked list. When we process the * results of an OA metrics query we need to consider all the periodic * samples between the Begin and End MI_REPORT_PERF_COUNT command * markers. * * 'Periodic' is a simplification as there are other automatic reports * written by the hardware also buffered here. * * Considering three queries, A, B and C: * * Time ----> * ________________A_________________ * | | * | ________B_________ _____C___________ * | | | | | | * * And an illustration of sample buffers read over this time frame: * [HEAD ][ ][ ][ ][ ][ ][ ][ ][TAIL ] * * These nodes may hold samples for query A: * [ ][ ][ A ][ A ][ A ][ A ][ A ][ ][ ] * * These nodes may hold samples for query B: * [ ][ ][ B ][ B ][ B ][ ][ ][ ][ ] * * These nodes may hold samples for query C: * [ ][ ][ ][ ][ ][ C ][ C ][ C ][ ] * * The illustration assumes we have an even distribution of periodic * samples so all nodes have the same size plotted against time: * * Note, to simplify code, the list is never empty. * * With overlapping queries we can see that periodic OA reports may * relate to multiple queries and care needs to be take to keep * track of sample buffers until there are no queries that might * depend on their contents. * * We use a node ref counting system where a reference ensures that a * node and all following nodes can't be freed/recycled until the * reference drops to zero. * * E.g. with a ref of one here: * [ 0 ][ 0 ][ 1 ][ 0 ][ 0 ][ 0 ][ 0 ][ 0 ][ 0 ] * * These nodes could be freed or recycled ("reaped"): * [ 0 ][ 0 ] * * These must be preserved until the leading ref drops to zero: * [ 1 ][ 0 ][ 0 ][ 0 ][ 0 ][ 0 ][ 0 ] * * When a query starts we take a reference on the current tail of * the list, knowing that no already-buffered samples can possibly * relate to the newly-started query. A pointer to this node is * also saved in the query object's ->oa.samples_head. * * E.g. starting query A while there are two nodes in .sample_buffers: * ________________A________ * | * * [ 0 ][ 1 ] * ^_______ Add a reference and store pointer to node in * A->oa.samples_head * * Moving forward to when the B query starts with no new buffer nodes: * (for reference, i915 perf reads() are only done when queries finish) * ________________A_______ * | ________B___ * | | * * [ 0 ][ 2 ] * ^_______ Add a reference and store pointer to * node in B->oa.samples_head * * Once a query is finished, after an OA query has become 'Ready', * once the End OA report has landed and after we we have processed * all the intermediate periodic samples then we drop the * ->oa.samples_head reference we took at the start. * * So when the B query has finished we have: * ________________A________ * | ______B___________ * | | | * [ 0 ][ 1 ][ 0 ][ 0 ][ 0 ] * ^_______ Drop B->oa.samples_head reference * * We still can't free these due to the A->oa.samples_head ref: * [ 1 ][ 0 ][ 0 ][ 0 ] * * When the A query finishes: (note there's a new ref for C's samples_head) * ________________A_________________ * | | * | _____C_________ * | | | * [ 0 ][ 0 ][ 0 ][ 0 ][ 1 ][ 0 ][ 0 ] * ^_______ Drop A->oa.samples_head reference * * And we can now reap these nodes up to the C->oa.samples_head: * [ X ][ X ][ X ][ X ] * keeping -> [ 1 ][ 0 ][ 0 ] * * We reap old sample buffers each time we finish processing an OA * query by iterating the sample_buffers list from the head until we * find a referenced node and stop. * * Reaped buffers move to a perfquery.free_sample_buffers list and * when we come to read() we first look to recycle a buffer from the * free_sample_buffers list before allocating a new buffer. */ struct oa_sample_buf { struct exec_node link; int refcount; int len; uint32_t last_timestamp; uint8_t buf[]; }; #define oa_sample_buf_buf_length(perf) (perf->oa_sample_size * 10) /** * gen representation of a performance query object. * * NB: We want to keep this structure relatively lean considering that * applications may expect to allocate enough objects to be able to * query around all draw calls in a frame. */ struct intel_perf_query_object { const struct intel_perf_query_info *queryinfo; /* See query->kind to know which state below is in use... */ union { struct { /** * BO containing OA counter snapshots at query Begin/End time. */ void *bo; /** * Address of mapped of @bo */ void *map; /** * The MI_REPORT_PERF_COUNT command lets us specify a unique * ID that will be reflected in the resulting OA report * that's written by the GPU. This is the ID we're expecting * in the begin report and the the end report should be * @begin_report_id + 1. */ int begin_report_id; /** * Reference the head of the brw->perfquery.sample_buffers * list at the time that the query started (so we only need * to look at nodes after this point when looking for samples * related to this query) * * (See struct brw_oa_sample_buf description for more details) */ struct exec_node *samples_head; /** * false while in the unaccumulated_elements list, and set to * true when the final, end MI_RPC snapshot has been * accumulated. */ bool results_accumulated; /** * Accumulated OA results between begin and end of the query. */ struct intel_perf_query_result result; } oa; struct { /** * BO containing starting and ending snapshots for the * statistics counters. */ void *bo; } pipeline_stats; }; }; struct intel_perf_context { struct intel_perf_config *perf; void * mem_ctx; /* ralloc context */ void * ctx; /* driver context (eg, brw_context) */ void * bufmgr; const struct intel_device_info *devinfo; uint32_t hw_ctx; int drm_fd; /* The i915 perf stream we open to setup + enable the OA counters */ int oa_stream_fd; /* An i915 perf stream fd gives exclusive access to the OA unit that will * report counter snapshots for a specific counter set/profile in a * specific layout/format so we can only start OA queries that are * compatible with the currently open fd... */ int current_oa_metrics_set_id; int current_oa_format; /* List of buffers containing OA reports */ struct exec_list sample_buffers; /* Cached list of empty sample buffers */ struct exec_list free_sample_buffers; int n_active_oa_queries; int n_active_pipeline_stats_queries; /* The number of queries depending on running OA counters which * extends beyond brw_end_perf_query() since we need to wait until * the last MI_RPC command has parsed by the GPU. * * Accurate accounting is important here as emitting an * MI_REPORT_PERF_COUNT command while the OA unit is disabled will * effectively hang the gpu. */ int n_oa_users; /* To help catch an spurious problem with the hardware or perf * forwarding samples, we emit each MI_REPORT_PERF_COUNT command * with a unique ID that we can explicitly check for... */ int next_query_start_report_id; /** * An array of queries whose results haven't yet been assembled * based on the data in buffer objects. * * These may be active, or have already ended. However, the * results have not been requested. */ struct intel_perf_query_object **unaccumulated; int unaccumulated_elements; int unaccumulated_array_size; /* The total number of query objects so we can relinquish * our exclusive access to perf if the application deletes * all of its objects. (NB: We only disable perf while * there are no active queries) */ int n_query_instances; int period_exponent; }; static bool inc_n_users(struct intel_perf_context *perf_ctx) { if (perf_ctx->n_oa_users == 0 && intel_perf_stream_set_state(perf_ctx->perf, perf_ctx->oa_stream_fd, true) < 0) { return false; } ++perf_ctx->n_oa_users; return true; } static void dec_n_users(struct intel_perf_context *perf_ctx) { /* Disabling the i915 perf stream will effectively disable the OA * counters. Note it's important to be sure there are no outstanding * MI_RPC commands at this point since they could stall the CS * indefinitely once OACONTROL is disabled. */ --perf_ctx->n_oa_users; if (perf_ctx->n_oa_users == 0 && intel_perf_stream_set_state(perf_ctx->perf, perf_ctx->oa_stream_fd, false) < 0) { DBG("WARNING: Error disabling gen perf stream: %m\n"); } } void intel_perf_close(struct intel_perf_context *perfquery, const struct intel_perf_query_info *query) { if (perfquery->oa_stream_fd != -1) { close(perfquery->oa_stream_fd); perfquery->oa_stream_fd = -1; } if (query && query->kind == INTEL_PERF_QUERY_TYPE_RAW) { struct intel_perf_query_info *raw_query = (struct intel_perf_query_info *) query; raw_query->oa_metrics_set_id = 0; } } bool intel_perf_open(struct intel_perf_context *perf_ctx, int metrics_set_id, uint64_t report_format, int period_exponent, int drm_fd, uint32_t ctx_id, bool enable) { int fd = intel_perf_stream_open(perf_ctx->perf, drm_fd, ctx_id, metrics_set_id, period_exponent, false, enable, NULL); if (fd == -1) { DBG("Error opening gen perf OA stream: %m\n"); return false; } perf_ctx->oa_stream_fd = fd; perf_ctx->current_oa_metrics_set_id = metrics_set_id; perf_ctx->current_oa_format = report_format; if (enable) ++perf_ctx->n_oa_users; return true; } static uint64_t get_metric_id(struct intel_perf_config *perf, const struct intel_perf_query_info *query) { /* These queries are know not to ever change, their config ID has been * loaded upon the first query creation. No need to look them up again. */ if (query->kind == INTEL_PERF_QUERY_TYPE_OA) return query->oa_metrics_set_id; assert(query->kind == INTEL_PERF_QUERY_TYPE_RAW); /* Raw queries can be reprogrammed up by an external application/library. * When a raw query is used for the first time it's id is set to a value != * 0. When it stops being used the id returns to 0. No need to reload the * ID when it's already loaded. */ if (query->oa_metrics_set_id != 0) { DBG("Raw query '%s' guid=%s using cached ID: %"PRIu64"\n", query->name, query->guid, query->oa_metrics_set_id); return query->oa_metrics_set_id; } struct intel_perf_query_info *raw_query = (struct intel_perf_query_info *)query; if (!intel_perf_load_metric_id(perf, query->guid, &raw_query->oa_metrics_set_id)) { DBG("Unable to read query guid=%s ID, falling back to test config\n", query->guid); raw_query->oa_metrics_set_id = perf->fallback_raw_oa_metric; } else { DBG("Raw query '%s'guid=%s loaded ID: %"PRIu64"\n", query->name, query->guid, query->oa_metrics_set_id); } return query->oa_metrics_set_id; } static struct oa_sample_buf * get_free_sample_buf(struct intel_perf_context *perf_ctx) { struct exec_node *node = exec_list_pop_head(&perf_ctx->free_sample_buffers); struct oa_sample_buf *buf; if (node) buf = exec_node_data(struct oa_sample_buf, node, link); else { buf = ralloc_size(perf_ctx->perf, sizeof(*buf) + oa_sample_buf_buf_length(perf_ctx->perf)); exec_node_init(&buf->link); buf->refcount = 0; } buf->len = 0; return buf; } static void reap_old_sample_buffers(struct intel_perf_context *perf_ctx) { struct exec_node *tail_node = exec_list_get_tail(&perf_ctx->sample_buffers); struct oa_sample_buf *tail_buf = exec_node_data(struct oa_sample_buf, tail_node, link); /* Remove all old, unreferenced sample buffers walking forward from * the head of the list, except always leave at least one node in * the list so we always have a node to reference when we Begin * a new query. */ foreach_list_typed_safe(struct oa_sample_buf, buf, link, &perf_ctx->sample_buffers) { if (buf->refcount == 0 && buf != tail_buf) { exec_node_remove(&buf->link); exec_list_push_head(&perf_ctx->free_sample_buffers, &buf->link); } else return; } } static void free_sample_bufs(struct intel_perf_context *perf_ctx) { foreach_list_typed_safe(struct oa_sample_buf, buf, link, &perf_ctx->free_sample_buffers) ralloc_free(buf); exec_list_make_empty(&perf_ctx->free_sample_buffers); } struct intel_perf_query_object * intel_perf_new_query(struct intel_perf_context *perf_ctx, unsigned query_index) { const struct intel_perf_query_info *query = &perf_ctx->perf->queries[query_index]; switch (query->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: if (perf_ctx->period_exponent == 0) return NULL; break; case INTEL_PERF_QUERY_TYPE_PIPELINE: break; } struct intel_perf_query_object *obj = calloc(1, sizeof(struct intel_perf_query_object)); if (!obj) return NULL; obj->queryinfo = query; perf_ctx->n_query_instances++; return obj; } int intel_perf_active_queries(struct intel_perf_context *perf_ctx, const struct intel_perf_query_info *query) { assert(perf_ctx->n_active_oa_queries == 0 || perf_ctx->n_active_pipeline_stats_queries == 0); switch (query->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: return perf_ctx->n_active_oa_queries; break; case INTEL_PERF_QUERY_TYPE_PIPELINE: return perf_ctx->n_active_pipeline_stats_queries; break; default: unreachable("Unknown query type"); break; } } const struct intel_perf_query_info* intel_perf_query_info(const struct intel_perf_query_object *query) { return query->queryinfo; } struct intel_perf_context * intel_perf_new_context(void *parent) { struct intel_perf_context *ctx = rzalloc(parent, struct intel_perf_context); if (! ctx) fprintf(stderr, "%s: failed to alloc context\n", __func__); return ctx; } struct intel_perf_config * intel_perf_config(struct intel_perf_context *ctx) { return ctx->perf; } void intel_perf_free_context(struct intel_perf_context *perf_ctx) { ralloc_free(perf_ctx); } void intel_perf_init_context(struct intel_perf_context *perf_ctx, struct intel_perf_config *perf_cfg, void * mem_ctx, /* ralloc context */ void * ctx, /* driver context (eg, brw_context) */ void * bufmgr, /* eg brw_bufmgr */ const struct intel_device_info *devinfo, uint32_t hw_ctx, int drm_fd) { perf_ctx->perf = perf_cfg; perf_ctx->mem_ctx = mem_ctx; perf_ctx->ctx = ctx; perf_ctx->bufmgr = bufmgr; perf_ctx->drm_fd = drm_fd; perf_ctx->hw_ctx = hw_ctx; perf_ctx->devinfo = devinfo; perf_ctx->unaccumulated = ralloc_array(mem_ctx, struct intel_perf_query_object *, 2); perf_ctx->unaccumulated_elements = 0; perf_ctx->unaccumulated_array_size = 2; exec_list_make_empty(&perf_ctx->sample_buffers); exec_list_make_empty(&perf_ctx->free_sample_buffers); /* It's convenient to guarantee that this linked list of sample * buffers is never empty so we add an empty head so when we * Begin an OA query we can always take a reference on a buffer * in this list. */ struct oa_sample_buf *buf = get_free_sample_buf(perf_ctx); exec_list_push_head(&perf_ctx->sample_buffers, &buf->link); perf_ctx->oa_stream_fd = -1; perf_ctx->next_query_start_report_id = 1000; /* The period_exponent gives a sampling period as follows: * sample_period = timestamp_period * 2^(period_exponent + 1) * * The timestamps increments every 80ns (HSW), ~52ns (GFX9LP) or * ~83ns (GFX8/9). * * The counter overflow period is derived from the EuActive counter * which reads a counter that increments by the number of clock * cycles multiplied by the number of EUs. It can be calculated as: * * 2^(number of bits in A counter) / (n_eus * max_intel_freq * 2) * * (E.g. 40 EUs @ 1GHz = ~53ms) * * We select a sampling period inferior to that overflow period to * ensure we cannot see more than 1 counter overflow, otherwise we * could loose information. */ int a_counter_in_bits = 32; if (devinfo->ver >= 8) a_counter_in_bits = 40; uint64_t overflow_period = pow(2, a_counter_in_bits) / (perf_cfg->sys_vars.n_eus * /* drop 1GHz freq to have units in nanoseconds */ 2); DBG("A counter overflow period: %"PRIu64"ns, %"PRIu64"ms (n_eus=%"PRIu64")\n", overflow_period, overflow_period / 1000000ul, perf_cfg->sys_vars.n_eus); int period_exponent = 0; uint64_t prev_sample_period, next_sample_period; for (int e = 0; e < 30; e++) { prev_sample_period = 1000000000ull * pow(2, e + 1) / devinfo->timestamp_frequency; next_sample_period = 1000000000ull * pow(2, e + 2) / devinfo->timestamp_frequency; /* Take the previous sampling period, lower than the overflow * period. */ if (prev_sample_period < overflow_period && next_sample_period > overflow_period) period_exponent = e + 1; } perf_ctx->period_exponent = period_exponent; if (period_exponent == 0) { DBG("WARNING: enable to find a sampling exponent\n"); } else { DBG("OA sampling exponent: %i ~= %"PRIu64"ms\n", period_exponent, prev_sample_period / 1000000ul); } } /** * Add a query to the global list of "unaccumulated queries." * * Queries are tracked here until all the associated OA reports have * been accumulated via accumulate_oa_reports() after the end * MI_REPORT_PERF_COUNT has landed in query->oa.bo. */ static void add_to_unaccumulated_query_list(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *obj) { if (perf_ctx->unaccumulated_elements >= perf_ctx->unaccumulated_array_size) { perf_ctx->unaccumulated_array_size *= 1.5; perf_ctx->unaccumulated = reralloc(perf_ctx->mem_ctx, perf_ctx->unaccumulated, struct intel_perf_query_object *, perf_ctx->unaccumulated_array_size); } perf_ctx->unaccumulated[perf_ctx->unaccumulated_elements++] = obj; } /** * Emit MI_STORE_REGISTER_MEM commands to capture all of the * pipeline statistics for the performance query object. */ static void snapshot_statistics_registers(struct intel_perf_context *ctx, struct intel_perf_query_object *obj, uint32_t offset_in_bytes) { struct intel_perf_config *perf = ctx->perf; const struct intel_perf_query_info *query = obj->queryinfo; const int n_counters = query->n_counters; for (int i = 0; i < n_counters; i++) { const struct intel_perf_query_counter *counter = &query->counters[i]; assert(counter->data_type == INTEL_PERF_COUNTER_DATA_TYPE_UINT64); perf->vtbl.store_register_mem(ctx->ctx, obj->pipeline_stats.bo, counter->pipeline_stat.reg, 8, offset_in_bytes + counter->offset); } } static void snapshot_query_layout(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query, bool end_snapshot) { struct intel_perf_config *perf_cfg = perf_ctx->perf; const struct intel_perf_query_field_layout *layout = &perf_cfg->query_layout; uint32_t offset = end_snapshot ? align(layout->size, layout->alignment) : 0; for (uint32_t f = 0; f < layout->n_fields; f++) { const struct intel_perf_query_field *field = &layout->fields[end_snapshot ? f : (layout->n_fields - 1 - f)]; switch (field->type) { case INTEL_PERF_QUERY_FIELD_TYPE_MI_RPC: perf_cfg->vtbl.emit_mi_report_perf_count(perf_ctx->ctx, query->oa.bo, offset + field->location, query->oa.begin_report_id + (end_snapshot ? 1 : 0)); break; case INTEL_PERF_QUERY_FIELD_TYPE_SRM_PERFCNT: case INTEL_PERF_QUERY_FIELD_TYPE_SRM_RPSTAT: case INTEL_PERF_QUERY_FIELD_TYPE_SRM_OA_A: case INTEL_PERF_QUERY_FIELD_TYPE_SRM_OA_B: case INTEL_PERF_QUERY_FIELD_TYPE_SRM_OA_C: case INTEL_PERF_QUERY_FIELD_TYPE_SRM_OA_PEC: perf_cfg->vtbl.store_register_mem(perf_ctx->ctx, query->oa.bo, field->mmio_offset, field->size, offset + field->location); break; default: unreachable("Invalid field type"); } } } bool intel_perf_begin_query(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query) { struct intel_perf_config *perf_cfg = perf_ctx->perf; const struct intel_perf_query_info *queryinfo = query->queryinfo; /* XXX: We have to consider that the command parser unit that parses batch * buffer commands and is used to capture begin/end counter snapshots isn't * implicitly synchronized with what's currently running across other GPU * units (such as the EUs running shaders) that the performance counters are * associated with. * * The intention of performance queries is to measure the work associated * with commands between the begin/end delimiters and so for that to be the * case we need to explicitly synchronize the parsing of commands to capture * Begin/End counter snapshots with what's running across other parts of the * GPU. * * When the command parser reaches a Begin marker it effectively needs to * drain everything currently running on the GPU until the hardware is idle * before capturing the first snapshot of counters - otherwise the results * would also be measuring the effects of earlier commands. * * When the command parser reaches an End marker it needs to stall until * everything currently running on the GPU has finished before capturing the * end snapshot - otherwise the results won't be a complete representation * of the work. * * To achieve this, we stall the pipeline at pixel scoreboard (prevent any * additional work to be processed by the pipeline until all pixels of the * previous draw has be completed). * * N.B. The final results are based on deltas of counters between (inside) * Begin/End markers so even though the total wall clock time of the * workload is stretched by larger pipeline bubbles the bubbles themselves * are generally invisible to the query results. Whether that's a good or a * bad thing depends on the use case. For a lower real-time impact while * capturing metrics then periodic sampling may be a better choice than * INTEL_performance_query. * * * This is our Begin synchronization point to drain current work on the * GPU before we capture our first counter snapshot... */ perf_cfg->vtbl.emit_stall_at_pixel_scoreboard(perf_ctx->ctx); switch (queryinfo->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: { /* Opening an i915 perf stream implies exclusive access to the OA unit * which will generate counter reports for a specific counter set with a * specific layout/format so we can't begin any OA based queries that * require a different counter set or format unless we get an opportunity * to close the stream and open a new one... */ uint64_t metric_id = get_metric_id(perf_ctx->perf, queryinfo); if (perf_ctx->oa_stream_fd != -1 && perf_ctx->current_oa_metrics_set_id != metric_id) { if (perf_ctx->n_oa_users != 0) { DBG("WARNING: Begin failed already using perf config=%i/%"PRIu64"\n", perf_ctx->current_oa_metrics_set_id, metric_id); return false; } else intel_perf_close(perf_ctx, queryinfo); } /* If the OA counters aren't already on, enable them. */ if (perf_ctx->oa_stream_fd == -1) { assert(perf_ctx->period_exponent != 0); if (!intel_perf_open(perf_ctx, metric_id, queryinfo->oa_format, perf_ctx->period_exponent, perf_ctx->drm_fd, perf_ctx->hw_ctx, false)) return false; } else { assert(perf_ctx->current_oa_metrics_set_id == metric_id && perf_ctx->current_oa_format == queryinfo->oa_format); } if (!inc_n_users(perf_ctx)) { DBG("WARNING: Error enabling i915 perf stream: %m\n"); return false; } if (query->oa.bo) { perf_cfg->vtbl.bo_unreference(query->oa.bo); query->oa.bo = NULL; } query->oa.bo = perf_cfg->vtbl.bo_alloc(perf_ctx->bufmgr, "perf. query OA MI_RPC bo", MI_RPC_BO_SIZE); #if MESA_DEBUG /* Pre-filling the BO helps debug whether writes landed. */ void *map = perf_cfg->vtbl.bo_map(perf_ctx->ctx, query->oa.bo, MAP_WRITE); memset(map, 0x80, MI_RPC_BO_SIZE); perf_cfg->vtbl.bo_unmap(query->oa.bo); #endif query->oa.begin_report_id = perf_ctx->next_query_start_report_id; perf_ctx->next_query_start_report_id += 2; snapshot_query_layout(perf_ctx, query, false /* end_snapshot */); ++perf_ctx->n_active_oa_queries; /* No already-buffered samples can possibly be associated with this query * so create a marker within the list of sample buffers enabling us to * easily ignore earlier samples when processing this query after * completion. */ assert(!exec_list_is_empty(&perf_ctx->sample_buffers)); query->oa.samples_head = exec_list_get_tail(&perf_ctx->sample_buffers); struct oa_sample_buf *buf = exec_node_data(struct oa_sample_buf, query->oa.samples_head, link); /* This reference will ensure that future/following sample * buffers (that may relate to this query) can't be freed until * this drops to zero. */ buf->refcount++; intel_perf_query_result_clear(&query->oa.result); query->oa.results_accumulated = false; add_to_unaccumulated_query_list(perf_ctx, query); break; } case INTEL_PERF_QUERY_TYPE_PIPELINE: if (query->pipeline_stats.bo) { perf_cfg->vtbl.bo_unreference(query->pipeline_stats.bo); query->pipeline_stats.bo = NULL; } query->pipeline_stats.bo = perf_cfg->vtbl.bo_alloc(perf_ctx->bufmgr, "perf. query pipeline stats bo", STATS_BO_SIZE); /* Take starting snapshots. */ snapshot_statistics_registers(perf_ctx, query, 0); ++perf_ctx->n_active_pipeline_stats_queries; break; default: unreachable("Unknown query type"); break; } return true; } void intel_perf_end_query(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query) { struct intel_perf_config *perf_cfg = perf_ctx->perf; /* Ensure that the work associated with the queried commands will have * finished before taking our query end counter readings. * * For more details see comment in brw_begin_perf_query for * corresponding flush. */ perf_cfg->vtbl.emit_stall_at_pixel_scoreboard(perf_ctx->ctx); switch (query->queryinfo->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: /* NB: It's possible that the query will have already been marked * as 'accumulated' if an error was seen while reading samples * from perf. In this case we mustn't try and emit a closing * MI_RPC command in case the OA unit has already been disabled */ if (!query->oa.results_accumulated) snapshot_query_layout(perf_ctx, query, true /* end_snapshot */); --perf_ctx->n_active_oa_queries; /* NB: even though the query has now ended, it can't be accumulated * until the end MI_REPORT_PERF_COUNT snapshot has been written * to query->oa.bo */ break; case INTEL_PERF_QUERY_TYPE_PIPELINE: snapshot_statistics_registers(perf_ctx, query, STATS_BO_END_OFFSET_BYTES); --perf_ctx->n_active_pipeline_stats_queries; break; default: unreachable("Unknown query type"); break; } } bool intel_perf_oa_stream_ready(struct intel_perf_context *perf_ctx) { struct pollfd pfd; pfd.fd = perf_ctx->oa_stream_fd; pfd.events = POLLIN; pfd.revents = 0; if (poll(&pfd, 1, 0) < 0) { DBG("Error polling OA stream\n"); return false; } if (!(pfd.revents & POLLIN)) return false; return true; } ssize_t intel_perf_read_oa_stream(struct intel_perf_context *perf_ctx, void* buf, size_t nbytes) { return intel_perf_stream_read_samples(perf_ctx->perf, perf_ctx->oa_stream_fd, buf, nbytes); } enum OaReadStatus { OA_READ_STATUS_ERROR, OA_READ_STATUS_UNFINISHED, OA_READ_STATUS_FINISHED, }; static enum OaReadStatus read_oa_samples_until(struct intel_perf_context *perf_ctx, uint32_t start_timestamp, uint32_t end_timestamp) { struct exec_node *tail_node = exec_list_get_tail(&perf_ctx->sample_buffers); struct oa_sample_buf *tail_buf = exec_node_data(struct oa_sample_buf, tail_node, link); uint32_t last_timestamp = tail_buf->len == 0 ? start_timestamp : tail_buf->last_timestamp; bool sample_read = false; while (1) { struct oa_sample_buf *buf = get_free_sample_buf(perf_ctx); uint32_t offset; int len; len = intel_perf_stream_read_samples(perf_ctx->perf, perf_ctx->oa_stream_fd, buf->buf, oa_sample_buf_buf_length(perf_ctx->perf)); if (len <= 0) { exec_list_push_tail(&perf_ctx->free_sample_buffers, &buf->link); if (len == 0) { if (sample_read) return OA_READ_STATUS_FINISHED; DBG("Spurious EOF reading i915 perf samples\n"); return OA_READ_STATUS_ERROR; } if (len != -EAGAIN) { if (sample_read) return OA_READ_STATUS_FINISHED; DBG("Error reading i915 perf samples: %m\n"); return OA_READ_STATUS_ERROR; } if ((last_timestamp - start_timestamp) >= INT32_MAX) return OA_READ_STATUS_UNFINISHED; if ((last_timestamp - start_timestamp) < (end_timestamp - start_timestamp)) return OA_READ_STATUS_UNFINISHED; return OA_READ_STATUS_FINISHED; } buf->len = len; exec_list_push_tail(&perf_ctx->sample_buffers, &buf->link); /* Go through the reports and update the last timestamp. */ offset = 0; while (offset < buf->len) { const struct intel_perf_record_header *header = (const struct intel_perf_record_header *) &buf->buf[offset]; uint32_t *report = (uint32_t *) (header + 1); if (header->type == INTEL_PERF_RECORD_TYPE_SAMPLE) last_timestamp = report[1]; offset += header->size; sample_read = true; } buf->last_timestamp = last_timestamp; } unreachable("not reached"); return OA_READ_STATUS_ERROR; } /** * Try to read all the reports until either the delimiting timestamp * or an error arises. */ static bool read_oa_samples_for_query(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query, void *current_batch) { uint32_t *start; uint32_t *last; uint32_t *end; struct intel_perf_config *perf_cfg = perf_ctx->perf; /* We need the MI_REPORT_PERF_COUNT to land before we can start * accumulate. */ assert(!perf_cfg->vtbl.batch_references(current_batch, query->oa.bo) && !perf_cfg->vtbl.bo_busy(query->oa.bo)); /* Map the BO once here and let accumulate_oa_reports() unmap * it. */ if (query->oa.map == NULL) query->oa.map = perf_cfg->vtbl.bo_map(perf_ctx->ctx, query->oa.bo, MAP_READ); start = last = query->oa.map; end = query->oa.map + perf_ctx->perf->query_layout.size; if (start[0] != query->oa.begin_report_id) { DBG("Spurious start report id=%"PRIu32"\n", start[0]); return true; } if (end[0] != (query->oa.begin_report_id + 1)) { DBG("Spurious end report id=%"PRIu32"\n", end[0]); return true; } /* Read the reports until the end timestamp. */ switch (read_oa_samples_until(perf_ctx, start[1], end[1])) { case OA_READ_STATUS_ERROR: FALLTHROUGH; /* Let accumulate_oa_reports() deal with the error. */ case OA_READ_STATUS_FINISHED: return true; case OA_READ_STATUS_UNFINISHED: return false; } unreachable("invalid read status"); return false; } void intel_perf_wait_query(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query, void *current_batch) { struct intel_perf_config *perf_cfg = perf_ctx->perf; struct brw_bo *bo = NULL; switch (query->queryinfo->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: bo = query->oa.bo; break; case INTEL_PERF_QUERY_TYPE_PIPELINE: bo = query->pipeline_stats.bo; break; default: unreachable("Unknown query type"); break; } if (bo == NULL) return; /* If the current batch references our results bo then we need to * flush first... */ if (perf_cfg->vtbl.batch_references(current_batch, bo)) perf_cfg->vtbl.batchbuffer_flush(perf_ctx->ctx, __FILE__, __LINE__); perf_cfg->vtbl.bo_wait_rendering(bo); } bool intel_perf_is_query_ready(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query, void *current_batch) { struct intel_perf_config *perf_cfg = perf_ctx->perf; switch (query->queryinfo->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: return (query->oa.results_accumulated || (query->oa.bo && !perf_cfg->vtbl.batch_references(current_batch, query->oa.bo) && !perf_cfg->vtbl.bo_busy(query->oa.bo))); case INTEL_PERF_QUERY_TYPE_PIPELINE: return (query->pipeline_stats.bo && !perf_cfg->vtbl.batch_references(current_batch, query->pipeline_stats.bo) && !perf_cfg->vtbl.bo_busy(query->pipeline_stats.bo)); default: unreachable("Unknown query type"); break; } return false; } /** * Remove a query from the global list of unaccumulated queries once * after successfully accumulating the OA reports associated with the * query in accumulate_oa_reports() or when discarding unwanted query * results. */ static void drop_from_unaccumulated_query_list(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query) { for (int i = 0; i < perf_ctx->unaccumulated_elements; i++) { if (perf_ctx->unaccumulated[i] == query) { int last_elt = --perf_ctx->unaccumulated_elements; if (i == last_elt) perf_ctx->unaccumulated[i] = NULL; else { perf_ctx->unaccumulated[i] = perf_ctx->unaccumulated[last_elt]; } break; } } /* Drop our samples_head reference so that associated periodic * sample data buffers can potentially be reaped if they aren't * referenced by any other queries... */ struct oa_sample_buf *buf = exec_node_data(struct oa_sample_buf, query->oa.samples_head, link); assert(buf->refcount > 0); buf->refcount--; query->oa.samples_head = NULL; reap_old_sample_buffers(perf_ctx); } /* In general if we see anything spurious while accumulating results, * we don't try and continue accumulating the current query, hoping * for the best, we scrap anything outstanding, and then hope for the * best with new queries. */ static void discard_all_queries(struct intel_perf_context *perf_ctx) { while (perf_ctx->unaccumulated_elements) { struct intel_perf_query_object *query = perf_ctx->unaccumulated[0]; query->oa.results_accumulated = true; drop_from_unaccumulated_query_list(perf_ctx, query); dec_n_users(perf_ctx); } } /* Looks for the validity bit of context ID (dword 2) of an OA report. */ static bool oa_report_ctx_id_valid(const struct intel_device_info *devinfo, const uint32_t *report) { assert(devinfo->ver >= 8); if (devinfo->ver == 8) return (report[0] & (1 << 25)) != 0; return (report[0] & (1 << 16)) != 0; } /** * Accumulate raw OA counter values based on deltas between pairs of * OA reports. * * Accumulation starts from the first report captured via * MI_REPORT_PERF_COUNT (MI_RPC) by brw_begin_perf_query() until the * last MI_RPC report requested by brw_end_perf_query(). Between these * two reports there may also some number of periodically sampled OA * reports collected via the i915 perf interface - depending on the * duration of the query. * * These periodic snapshots help to ensure we handle counter overflow * correctly by being frequent enough to ensure we don't miss multiple * overflows of a counter between snapshots. For Gfx8+ the i915 perf * snapshots provide the extra context-switch reports that let us * subtract out the progress of counters associated with other * contexts running on the system. */ static void accumulate_oa_reports(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query) { const struct intel_device_info *devinfo = perf_ctx->devinfo; uint32_t *start; uint32_t *last; uint32_t *end; struct exec_node *first_samples_node; bool last_report_ctx_match = true; int out_duration = 0; assert(query->oa.map != NULL); start = last = query->oa.map; end = query->oa.map + perf_ctx->perf->query_layout.size; if (start[0] != query->oa.begin_report_id) { DBG("Spurious start report id=%"PRIu32"\n", start[0]); goto error; } if (end[0] != (query->oa.begin_report_id + 1)) { DBG("Spurious end report id=%"PRIu32"\n", end[0]); goto error; } /* On Gfx12+ OA reports are sourced from per context counters, so we don't * ever have to look at the global OA buffer. Yey \o/ */ if (perf_ctx->devinfo->ver >= 12) { last = start; goto end; } /* See if we have any periodic reports to accumulate too... */ /* N.B. The oa.samples_head was set when the query began and * pointed to the tail of the perf_ctx->sample_buffers list at * the time the query started. Since the buffer existed before the * first MI_REPORT_PERF_COUNT command was emitted we therefore know * that no data in this particular node's buffer can possibly be * associated with the query - so skip ahead one... */ first_samples_node = query->oa.samples_head->next; foreach_list_typed_from(struct oa_sample_buf, buf, link, &perf_ctx->sample_buffers, first_samples_node) { int offset = 0; while (offset < buf->len) { const struct intel_perf_record_header *header = (const struct intel_perf_record_header *)(buf->buf + offset); assert(header->size != 0); assert(header->size <= buf->len); offset += header->size; switch (header->type) { case INTEL_PERF_RECORD_TYPE_SAMPLE: { uint32_t *report = (uint32_t *)(header + 1); bool report_ctx_match = true; bool add = true; /* Ignore reports that come before the start marker. * (Note: takes care to allow overflow of 32bit timestamps) */ if (intel_device_info_timebase_scale(devinfo, report[1] - start[1]) > 5000000000) { continue; } /* Ignore reports that come after the end marker. * (Note: takes care to allow overflow of 32bit timestamps) */ if (intel_device_info_timebase_scale(devinfo, report[1] - end[1]) <= 5000000000) { goto end; } /* For Gfx8+ since the counters continue while other * contexts are running we need to discount any unrelated * deltas. The hardware automatically generates a report * on context switch which gives us a new reference point * to continuing adding deltas from. * * For Haswell we can rely on the HW to stop the progress * of OA counters while any other context is acctive. */ if (devinfo->ver >= 8) { /* Consider that the current report matches our context only if * the report says the report ID is valid. */ report_ctx_match = oa_report_ctx_id_valid(devinfo, report) && report[2] == start[2]; if (report_ctx_match) out_duration = 0; else out_duration++; /* Only add the delta between <last, report> if the last report * was clearly identified as our context, or if we have at most * 1 report without a matching ID. * * The OA unit will sometimes label reports with an invalid * context ID when i915 rewrites the execlist submit register * with the same context as the one currently running. This * happens when i915 wants to notify the HW of ringbuffer tail * register update. We have to consider this report as part of * our context as the 3d pipeline behind the OACS unit is still * processing the operations started at the previous execlist * submission. */ add = last_report_ctx_match && out_duration < 2; } if (add) { intel_perf_query_result_accumulate(&query->oa.result, query->queryinfo, last, report); } else { /* We're not adding the delta because we've identified it's not * for the context we filter for. We can consider that the * query was split. */ query->oa.result.query_disjoint = true; } last = report; last_report_ctx_match = report_ctx_match; break; } case INTEL_PERF_RECORD_TYPE_OA_BUFFER_LOST: DBG("perf: OA error: all reports lost\n"); goto error; case INTEL_PERF_RECORD_TYPE_OA_REPORT_LOST: DBG("perf: OA report lost\n"); break; } } } end: intel_perf_query_result_accumulate(&query->oa.result, query->queryinfo, last, end); query->oa.results_accumulated = true; drop_from_unaccumulated_query_list(perf_ctx, query); dec_n_users(perf_ctx); return; error: discard_all_queries(perf_ctx); } void intel_perf_delete_query(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query) { struct intel_perf_config *perf_cfg = perf_ctx->perf; /* We can assume that the frontend waits for a query to complete * before ever calling into here, so we don't have to worry about * deleting an in-flight query object. */ switch (query->queryinfo->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: if (query->oa.bo) { if (!query->oa.results_accumulated) { drop_from_unaccumulated_query_list(perf_ctx, query); dec_n_users(perf_ctx); } perf_cfg->vtbl.bo_unreference(query->oa.bo); query->oa.bo = NULL; } query->oa.results_accumulated = false; break; case INTEL_PERF_QUERY_TYPE_PIPELINE: if (query->pipeline_stats.bo) { perf_cfg->vtbl.bo_unreference(query->pipeline_stats.bo); query->pipeline_stats.bo = NULL; } break; default: unreachable("Unknown query type"); break; } /* As an indication that the INTEL_performance_query extension is no * longer in use, it's a good time to free our cache of sample * buffers and close any current i915-perf stream. */ if (--perf_ctx->n_query_instances == 0) { free_sample_bufs(perf_ctx); intel_perf_close(perf_ctx, query->queryinfo); } free(query); } static int get_oa_counter_data(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query, size_t data_size, uint8_t *data) { struct intel_perf_config *perf_cfg = perf_ctx->perf; const struct intel_perf_query_info *queryinfo = query->queryinfo; int n_counters = queryinfo->n_counters; int written = 0; for (int i = 0; i < n_counters; i++) { const struct intel_perf_query_counter *counter = &queryinfo->counters[i]; uint64_t *out_uint64; float *out_float; size_t counter_size = intel_perf_query_counter_get_size(counter); if (counter_size) { switch (counter->data_type) { case INTEL_PERF_COUNTER_DATA_TYPE_UINT64: out_uint64 = (uint64_t *)(data + counter->offset); *out_uint64 = counter->oa_counter_read_uint64(perf_cfg, queryinfo, &query->oa.result); break; case INTEL_PERF_COUNTER_DATA_TYPE_FLOAT: out_float = (float *)(data + counter->offset); *out_float = counter->oa_counter_read_float(perf_cfg, queryinfo, &query->oa.result); break; default: /* So far we aren't using uint32, double or bool32... */ unreachable("unexpected counter data type"); } if (counter->offset + counter_size > written) written = counter->offset + counter_size; } } return written; } static int get_pipeline_stats_data(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query, size_t data_size, uint8_t *data) { struct intel_perf_config *perf_cfg = perf_ctx->perf; const struct intel_perf_query_info *queryinfo = query->queryinfo; int n_counters = queryinfo->n_counters; uint8_t *p = data; uint64_t *start = perf_cfg->vtbl.bo_map(perf_ctx->ctx, query->pipeline_stats.bo, MAP_READ); uint64_t *end = start + (STATS_BO_END_OFFSET_BYTES / sizeof(uint64_t)); for (int i = 0; i < n_counters; i++) { const struct intel_perf_query_counter *counter = &queryinfo->counters[i]; uint64_t value = end[i] - start[i]; if (counter->pipeline_stat.numerator != counter->pipeline_stat.denominator) { value *= counter->pipeline_stat.numerator; value /= counter->pipeline_stat.denominator; } *((uint64_t *)p) = value; p += 8; } perf_cfg->vtbl.bo_unmap(query->pipeline_stats.bo); return p - data; } void intel_perf_get_query_data(struct intel_perf_context *perf_ctx, struct intel_perf_query_object *query, void *current_batch, int data_size, unsigned *data, unsigned *bytes_written) { struct intel_perf_config *perf_cfg = perf_ctx->perf; int written = 0; switch (query->queryinfo->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: if (!query->oa.results_accumulated) { /* Due to the sampling frequency of the OA buffer by the i915-perf * driver, there can be a 5ms delay between the Mesa seeing the query * complete and i915 making all the OA buffer reports available to us. * We need to wait for all the reports to come in before we can do * the post processing removing unrelated deltas. * There is a i915-perf series to address this issue, but it's * not been merged upstream yet. */ while (!read_oa_samples_for_query(perf_ctx, query, current_batch)) ; uint32_t *begin_report = query->oa.map; uint32_t *end_report = query->oa.map + perf_cfg->query_layout.size; intel_perf_query_result_accumulate_fields(&query->oa.result, query->queryinfo, begin_report, end_report, true /* no_oa_accumulate */); accumulate_oa_reports(perf_ctx, query); assert(query->oa.results_accumulated); perf_cfg->vtbl.bo_unmap(query->oa.bo); query->oa.map = NULL; } if (query->queryinfo->kind == INTEL_PERF_QUERY_TYPE_OA) { written = get_oa_counter_data(perf_ctx, query, data_size, (uint8_t *)data); } else { const struct intel_device_info *devinfo = perf_ctx->devinfo; written = intel_perf_query_result_write_mdapi((uint8_t *)data, data_size, devinfo, query->queryinfo, &query->oa.result); } break; case INTEL_PERF_QUERY_TYPE_PIPELINE: written = get_pipeline_stats_data(perf_ctx, query, data_size, (uint8_t *)data); break; default: unreachable("Unknown query type"); break; } if (bytes_written) *bytes_written = written; } void intel_perf_dump_query_count(struct intel_perf_context *perf_ctx) { DBG("Queries: (Open queries = %d, OA users = %d)\n", perf_ctx->n_active_oa_queries, perf_ctx->n_oa_users); } void intel_perf_dump_query(struct intel_perf_context *ctx, struct intel_perf_query_object *obj, void *current_batch) { switch (obj->queryinfo->kind) { case INTEL_PERF_QUERY_TYPE_OA: case INTEL_PERF_QUERY_TYPE_RAW: DBG("BO: %-4s OA data: %-10s %-15s\n", obj->oa.bo ? "yes," : "no,", intel_perf_is_query_ready(ctx, obj, current_batch) ? "ready," : "not ready,", obj->oa.results_accumulated ? "accumulated" : "not accumulated"); break; case INTEL_PERF_QUERY_TYPE_PIPELINE: DBG("BO: %-4s\n", obj->pipeline_stats.bo ? "yes" : "no"); break; default: unreachable("Unknown query type"); break; } }