diff options
Diffstat (limited to 'src/intel/perf/gen_perf.c')
| -rw-r--r-- | src/intel/perf/gen_perf.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/src/intel/perf/gen_perf.c b/src/intel/perf/gen_perf.c index fa5a53ff3d4..5fb6044a859 100644 --- a/src/intel/perf/gen_perf.c +++ b/src/intel/perf/gen_perf.c @@ -47,6 +47,20 @@ #define MI_RPC_BO_END_OFFSET_BYTES (MI_RPC_BO_SIZE / 2) #define MI_FREQ_END_OFFSET_BYTES (3076) +#define INTEL_MASK(high, low) (((1u<<((high)-(low)+1))-1)<<(low)) + +#define GEN7_RPSTAT1 0xA01C +#define GEN7_RPSTAT1_CURR_GT_FREQ_SHIFT 7 +#define GEN7_RPSTAT1_CURR_GT_FREQ_MASK INTEL_MASK(13, 7) +#define GEN7_RPSTAT1_PREV_GT_FREQ_SHIFT 0 +#define GEN7_RPSTAT1_PREV_GT_FREQ_MASK INTEL_MASK(6, 0) + +#define GEN9_RPSTAT0 0xA01C +#define GEN9_RPSTAT0_CURR_GT_FREQ_SHIFT 23 +#define GEN9_RPSTAT0_CURR_GT_FREQ_MASK INTEL_MASK(31, 23) +#define GEN9_RPSTAT0_PREV_GT_FREQ_SHIFT 0 +#define GEN9_RPSTAT0_PREV_GT_FREQ_MASK INTEL_MASK(8, 0) + #define MAP_READ (1 << 0) #define MAP_WRITE (1 << 1) @@ -1571,6 +1585,192 @@ drop_from_unaccumulated_query_list(struct gen_perf_context *perf_ctx, gen_perf_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 gen_perf_context *perf_ctx) +{ + while (perf_ctx->unaccumulated_elements) { + struct gen_perf_query_object *query = perf_ctx->unaccumulated[0]; + + query->oa.results_accumulated = true; + drop_from_unaccumulated_query_list(perf_ctx, query); + + gen_perf_dec_n_users(perf_ctx); + } +} + +/** + * 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 Gen8+ 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 gen_perf_context *perf_ctx, + struct gen_perf_query_object *query) +{ + const struct gen_device_info *devinfo = perf_ctx->devinfo; + uint32_t *start; + uint32_t *last; + uint32_t *end; + struct exec_node *first_samples_node; + bool in_ctx = true; + int out_duration = 0; + + assert(query->oa.map != NULL); + + start = last = query->oa.map; + end = query->oa.map + MI_RPC_BO_END_OFFSET_BYTES; + + 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; + } + + /* 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 drm_i915_perf_record_header *header = + (const struct drm_i915_perf_record_header *)(buf->buf + offset); + + assert(header->size != 0); + assert(header->size <= buf->len); + + offset += header->size; + + switch (header->type) { + case DRM_I915_PERF_RECORD_SAMPLE: { + uint32_t *report = (uint32_t *)(header + 1); + bool add = true; + + /* Ignore reports that come before the start marker. + * (Note: takes care to allow overflow of 32bit timestamps) + */ + if (gen_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 (gen_device_info_timebase_scale(devinfo, + report[1] - end[1]) <= 5000000000) { + goto end; + } + + /* For Gen8+ 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->gen >= 8) { + if (in_ctx && report[2] != query->oa.result.hw_id) { + DBG("i915 perf: Switch AWAY (observed by ID change)\n"); + in_ctx = false; + out_duration = 0; + } else if (in_ctx == false && report[2] == query->oa.result.hw_id) { + DBG("i915 perf: Switch TO\n"); + in_ctx = true; + + /* From experimentation in IGT, we found that the OA unit + * might label some report as "idle" (using an invalid + * context ID), right after a report for a given context. + * Deltas generated by those reports actually belong to the + * previous context, even though they're not labelled as + * such. + * + * We didn't *really* Switch AWAY in the case that we e.g. + * saw a single periodic report while idle... + */ + if (out_duration >= 1) + add = false; + } else if (in_ctx) { + assert(report[2] == query->oa.result.hw_id); + DBG("i915 perf: Continuation IN\n"); + } else { + assert(report[2] != query->oa.result.hw_id); + DBG("i915 perf: Continuation OUT\n"); + add = false; + out_duration++; + } + } + + if (add) { + gen_perf_query_result_accumulate(&query->oa.result, query->queryinfo, + last, report); + } + + last = report; + + break; + } + + case DRM_I915_PERF_RECORD_OA_BUFFER_LOST: + DBG("i915 perf: OA error: all reports lost\n"); + goto error; + case DRM_I915_PERF_RECORD_OA_REPORT_LOST: + DBG("i915 perf: OA report lost\n"); + break; + } + } + } + +end: + + gen_perf_query_result_accumulate(&query->oa.result, query->queryinfo, + last, end); + + query->oa.results_accumulated = true; + drop_from_unaccumulated_query_list(perf_ctx, query); + gen_perf_dec_n_users(perf_ctx); + + return; + +error: + + discard_all_queries(perf_ctx); +} + void gen_perf_delete_query(struct gen_perf_context *perf_ctx, struct gen_perf_query_object *query) @@ -1620,3 +1820,162 @@ gen_perf_delete_query(struct gen_perf_context *perf_ctx, free(query); } + +#define GET_FIELD(word, field) (((word) & field ## _MASK) >> field ## _SHIFT) + +static void +read_gt_frequency(struct gen_perf_context *perf_ctx, + struct gen_perf_query_object *obj) +{ + const struct gen_device_info *devinfo = perf_ctx->devinfo; + uint32_t start = *((uint32_t *)(obj->oa.map + MI_FREQ_START_OFFSET_BYTES)), + end = *((uint32_t *)(obj->oa.map + MI_FREQ_END_OFFSET_BYTES)); + + switch (devinfo->gen) { + case 7: + case 8: + obj->oa.gt_frequency[0] = GET_FIELD(start, GEN7_RPSTAT1_CURR_GT_FREQ) * 50ULL; + obj->oa.gt_frequency[1] = GET_FIELD(end, GEN7_RPSTAT1_CURR_GT_FREQ) * 50ULL; + break; + case 9: + case 10: + case 11: + obj->oa.gt_frequency[0] = GET_FIELD(start, GEN9_RPSTAT0_CURR_GT_FREQ) * 50ULL / 3ULL; + obj->oa.gt_frequency[1] = GET_FIELD(end, GEN9_RPSTAT0_CURR_GT_FREQ) * 50ULL / 3ULL; + break; + default: + unreachable("unexpected gen"); + } + + /* Put the numbers into Hz. */ + obj->oa.gt_frequency[0] *= 1000000ULL; + obj->oa.gt_frequency[1] *= 1000000ULL; +} + +static int +get_oa_counter_data(struct gen_perf_context *perf_ctx, + struct gen_perf_query_object *query, + size_t data_size, + uint8_t *data) +{ + struct gen_perf_config *perf_cfg = perf_ctx->perf; + const struct gen_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 gen_perf_query_counter *counter = &queryinfo->counters[i]; + uint64_t *out_uint64; + float *out_float; + size_t counter_size = gen_perf_query_counter_get_size(counter); + + if (counter_size) { + switch (counter->data_type) { + case GEN_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.accumulator); + break; + case GEN_PERF_COUNTER_DATA_TYPE_FLOAT: + out_float = (float *)(data + counter->offset); + *out_float = + counter->oa_counter_read_float(perf_cfg, queryinfo, + query->oa.result.accumulator); + break; + default: + /* So far we aren't using uint32, double or bool32... */ + unreachable("unexpected counter data type"); + } + written = counter->offset + counter_size; + } + } + + return written; +} + +static int +get_pipeline_stats_data(struct gen_perf_context *perf_ctx, + struct gen_perf_query_object *query, + size_t data_size, + uint8_t *data) + +{ + struct gen_perf_config *perf_cfg = perf_ctx->perf; + const struct gen_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 gen_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 +gen_perf_get_query_data(struct gen_perf_context *perf_ctx, + struct gen_perf_query_object *query, + int data_size, + unsigned *data, + unsigned *bytes_written) +{ + struct gen_perf_config *perf_cfg = perf_ctx->perf; + int written = 0; + + switch (query->queryinfo->kind) { + case GEN_PERF_QUERY_TYPE_OA: + case GEN_PERF_QUERY_TYPE_RAW: + if (!query->oa.results_accumulated) { + read_gt_frequency(perf_ctx, query); + uint32_t *begin_report = query->oa.map; + uint32_t *end_report = query->oa.map + MI_RPC_BO_END_OFFSET_BYTES; + gen_perf_query_result_read_frequencies(&query->oa.result, + perf_ctx->devinfo, + begin_report, + end_report); + 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 == GEN_PERF_QUERY_TYPE_OA) { + written = get_oa_counter_data(perf_ctx, query, data_size, (uint8_t *)data); + } else { + const struct gen_device_info *devinfo = perf_ctx->devinfo; + + written = gen_perf_query_result_write_mdapi((uint8_t *)data, data_size, + devinfo, &query->oa.result, + query->oa.gt_frequency[0], + query->oa.gt_frequency[1]); + } + break; + + case GEN_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; +} |