#include "iris_perf.h"
#include "iris_context.h"
-#include "perf/gen_perf_regs.h"
static void *
iris_oa_bo_alloc(void *bufmgr, const char *name, uint64_t size)
#define IRIS_PERF_H
#include "perf/gen_perf.h"
+#include "perf/gen_perf_query.h"
void iris_perf_init_vtbl(struct gen_perf_config *cfg);
#include "iris_context.h"
#include "iris_perf.h"
-#include "perf/gen_perf.h"
-#include "perf/gen_perf_regs.h"
-
struct iris_perf_query {
struct gl_perf_query_object base;
struct gen_perf_query_object *query;
#include <stdio.h>
#include <errno.h>
-#include "perf/gen_perf.h"
#include "pipe/p_defines.h"
#include "pipe/p_state.h"
#include "pipe/p_context.h"
GEN_PERF_FILES = \
perf/gen_perf.c \
perf/gen_perf.h \
+ perf/gen_perf_mdapi.c \
perf/gen_perf_mdapi.h \
- perf/gen_perf_mdapi.c
+ perf/gen_perf_query.h \
+ perf/gen_perf_query.c
GEN_PERF_GENERATED_FILES = \
perf/gen_perf_metrics.c \
#include <drm-uapi/i915_drm.h>
#include "common/gen_gem.h"
-#include "gen_perf.h"
-#include "gen_perf_regs.h"
-#include "perf/gen_perf_mdapi.h"
-#include "perf/gen_perf_metrics.h"
#include "dev/gen_debug.h"
#include "dev/gen_device_info.h"
+
+#include "perf/gen_perf.h"
+#include "perf/gen_perf_regs.h"
+#include "perf/gen_perf_mdapi.h"
+#include "perf/gen_perf_metrics.h"
+
#include "util/bitscan.h"
#include "util/mesa-sha1.h"
#include "util/u_math.h"
#define FILE_DEBUG_FLAG DEBUG_PERFMON
-#define MI_RPC_BO_SIZE 4096
-#define MI_FREQ_START_OFFSET_BYTES (3072)
-#define MI_RPC_BO_END_OFFSET_BYTES (MI_RPC_BO_SIZE / 2)
-#define MI_FREQ_END_OFFSET_BYTES (3076)
-
-#define MAP_READ (1 << 0)
-#define MAP_WRITE (1 << 1)
#define OA_REPORT_INVALID_CTX_ID (0xffffffff)
-/**
- * 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;
- uint8_t buf[I915_PERF_OA_SAMPLE_SIZE * 10];
- uint32_t last_timestamp;
-};
-
-/**
- * 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 gen_perf_query_object
-{
- const struct gen_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;
-
- /**
- * Frequency of the GT at begin and end of the query.
- */
- uint64_t gt_frequency[2];
-
- /**
- * Accumulated OA results between begin and end of the query.
- */
- struct gen_perf_query_result result;
- } oa;
-
- struct {
- /**
- * BO containing starting and ending snapshots for the
- * statistics counters.
- */
- void *bo;
- } pipeline_stats;
- };
-};
-
-struct gen_perf_context {
- struct gen_perf_config *perf;
-
- void * ctx; /* driver context (eg, brw_context) */
- void * bufmgr;
- const struct gen_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 gen_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;
-};
-
-const struct gen_perf_query_info*
-gen_perf_query_info(const struct gen_perf_query_object *query)
-{
- return query->queryinfo;
-}
-
-struct gen_perf_context *
-gen_perf_new_context(void *parent)
-{
- struct gen_perf_context *ctx = rzalloc(parent, struct gen_perf_context);
- if (! ctx)
- fprintf(stderr, "%s: failed to alloc context\n", __func__);
- return ctx;
-}
-
-struct gen_perf_config *
-gen_perf_config(struct gen_perf_context *ctx)
-{
- return ctx->perf;
-}
-
-struct gen_perf_query_object *
-gen_perf_new_query(struct gen_perf_context *perf_ctx, unsigned query_index)
-{
- const struct gen_perf_query_info *query =
- &perf_ctx->perf->queries[query_index];
- struct gen_perf_query_object *obj =
- calloc(1, sizeof(struct gen_perf_query_object));
-
- if (!obj)
- return NULL;
-
- obj->queryinfo = query;
-
- perf_ctx->n_query_instances++;
- return obj;
-}
-
-int
-gen_perf_active_queries(struct gen_perf_context *perf_ctx,
- const struct gen_perf_query_info *query)
-{
- assert(perf_ctx->n_active_oa_queries == 0 || perf_ctx->n_active_pipeline_stats_queries == 0);
-
- switch (query->kind) {
- case GEN_PERF_QUERY_TYPE_OA:
- case GEN_PERF_QUERY_TYPE_RAW:
- return perf_ctx->n_active_oa_queries;
- break;
-
- case GEN_PERF_QUERY_TYPE_PIPELINE:
- return perf_ctx->n_active_pipeline_stats_queries;
- break;
-
- default:
- unreachable("Unknown query type");
- break;
- }
-}
-
static inline uint64_t to_user_pointer(void *ptr)
{
return (uintptr_t) ptr;
}
}
-static uint64_t
-get_metric_id(struct gen_perf_config *perf,
- const struct gen_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 == GEN_PERF_QUERY_TYPE_OA)
- return query->oa_metrics_set_id;
-
- assert(query->kind == GEN_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 gen_perf_query_info *raw_query = (struct gen_perf_query_info *)query;
- if (!gen_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 = 1ULL;
- } 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 gen_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));
-
- exec_node_init(&buf->link);
- buf->refcount = 0;
- }
- buf->len = 0;
-
- return buf;
-}
-
-static void
-reap_old_sample_buffers(struct gen_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 gen_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);
-}
-
-/******************************************************************************/
-
-/**
- * Emit MI_STORE_REGISTER_MEM commands to capture all of the
- * pipeline statistics for the performance query object.
- */
-static void
-snapshot_statistics_registers(struct gen_perf_context *ctx,
- struct gen_perf_query_object *obj,
- uint32_t offset_in_bytes)
-{
- struct gen_perf_config *perf = ctx->perf;
- const struct gen_perf_query_info *query = obj->queryinfo;
- const int n_counters = query->n_counters;
-
- for (int i = 0; i < n_counters; i++) {
- const struct gen_perf_query_counter *counter = &query->counters[i];
-
- assert(counter->data_type == GEN_PERF_COUNTER_DATA_TYPE_UINT64);
-
- perf->vtbl.store_register_mem(ctx->ctx, obj->pipeline_stats.bo,
- counter->pipeline_stat.reg, 8,
- offset_in_bytes + i * sizeof(uint64_t));
- }
-}
-
-static void
-snapshot_freq_register(struct gen_perf_context *ctx,
- struct gen_perf_query_object *query,
- uint32_t bo_offset)
-{
- struct gen_perf_config *perf = ctx->perf;
- const struct gen_device_info *devinfo = ctx->devinfo;
-
- if (devinfo->gen == 8 && !devinfo->is_cherryview)
- perf->vtbl.store_register_mem(ctx->ctx, query->oa.bo, GEN7_RPSTAT1, 4, bo_offset);
- else if (devinfo->gen >= 9)
- perf->vtbl.store_register_mem(ctx->ctx, query->oa.bo, GEN9_RPSTAT0, 4, bo_offset);
-}
-
-static void
-gen_perf_close(struct gen_perf_context *perfquery,
- const struct gen_perf_query_info *query)
-{
- if (perfquery->oa_stream_fd != -1) {
- close(perfquery->oa_stream_fd);
- perfquery->oa_stream_fd = -1;
- }
- if (query->kind == GEN_PERF_QUERY_TYPE_RAW) {
- struct gen_perf_query_info *raw_query =
- (struct gen_perf_query_info *) query;
- raw_query->oa_metrics_set_id = 0;
- }
-}
-
-static bool
-gen_perf_open(struct gen_perf_context *perf_ctx,
- int metrics_set_id,
- int report_format,
- int period_exponent,
- int drm_fd,
- uint32_t ctx_id)
-{
- uint64_t properties[] = {
- /* Single context sampling */
- DRM_I915_PERF_PROP_CTX_HANDLE, ctx_id,
-
- /* Include OA reports in samples */
- DRM_I915_PERF_PROP_SAMPLE_OA, true,
-
- /* OA unit configuration */
- DRM_I915_PERF_PROP_OA_METRICS_SET, metrics_set_id,
- DRM_I915_PERF_PROP_OA_FORMAT, report_format,
- DRM_I915_PERF_PROP_OA_EXPONENT, period_exponent,
- };
- struct drm_i915_perf_open_param param = {
- .flags = I915_PERF_FLAG_FD_CLOEXEC |
- I915_PERF_FLAG_FD_NONBLOCK |
- I915_PERF_FLAG_DISABLED,
- .num_properties = ARRAY_SIZE(properties) / 2,
- .properties_ptr = (uintptr_t) properties,
- };
- int fd = gen_ioctl(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m);
- 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;
-
- return true;
-}
-
-static bool
-inc_n_users(struct gen_perf_context *perf_ctx)
-{
- if (perf_ctx->n_oa_users == 0 &&
- gen_ioctl(perf_ctx->oa_stream_fd, I915_PERF_IOCTL_ENABLE, 0) < 0)
- {
- return false;
- }
- ++perf_ctx->n_oa_users;
-
- return true;
-}
-
-static void
-dec_n_users(struct gen_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 &&
- gen_ioctl(perf_ctx->oa_stream_fd, I915_PERF_IOCTL_DISABLE, 0) < 0)
- {
- DBG("WARNING: Error disabling gen perf stream: %m\n");
- }
-}
-
void
gen_perf_init_metrics(struct gen_perf_config *perf_cfg,
const struct gen_device_info *devinfo,
if (load_oa_metrics(perf_cfg, drm_fd, devinfo))
register_mdapi_oa_query(devinfo, perf_cfg);
}
-
-void
-gen_perf_init_context(struct gen_perf_context *perf_ctx,
- struct gen_perf_config *perf_cfg,
- void * ctx, /* driver context (eg, brw_context) */
- void * bufmgr, /* eg brw_bufmgr */
- const struct gen_device_info *devinfo,
- uint32_t hw_ctx,
- int drm_fd)
-{
- perf_ctx->perf = perf_cfg;
- 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(ctx, struct gen_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;
-}
-
-/**
- * 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 gen_perf_context *perf_ctx,
- struct gen_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->ctx, perf_ctx->unaccumulated,
- struct gen_perf_query_object *,
- perf_ctx->unaccumulated_array_size);
- }
-
- perf_ctx->unaccumulated[perf_ctx->unaccumulated_elements++] = obj;
-}
-
-bool
-gen_perf_begin_query(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query)
-{
- struct gen_perf_config *perf_cfg = perf_ctx->perf;
- const struct gen_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 GEN_PERF_QUERY_TYPE_OA:
- case GEN_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
- gen_perf_close(perf_ctx, queryinfo);
- }
-
- /* If the OA counters aren't already on, enable them. */
- if (perf_ctx->oa_stream_fd == -1) {
- const struct gen_device_info *devinfo = perf_ctx->devinfo;
-
- /* The period_exponent gives a sampling period as follows:
- * sample_period = timestamp_period * 2^(period_exponent + 1)
- *
- * The timestamps increments every 80ns (HSW), ~52ns (GEN9LP) or
- * ~83ns (GEN8/9).
- *
- * 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_gen_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->gen >= 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;
- }
-
- if (period_exponent == 0) {
- DBG("WARNING: enable to find a sampling exponent\n");
- return false;
- }
-
- DBG("OA sampling exponent: %i ~= %"PRIu64"ms\n", period_exponent,
- prev_sample_period / 1000000ul);
-
- if (!gen_perf_open(perf_ctx, metric_id, queryinfo->oa_format,
- period_exponent, perf_ctx->drm_fd,
- perf_ctx->hw_ctx))
- 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);
-#ifdef 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;
-
- /* Take a starting OA counter snapshot. */
- perf_cfg->vtbl.emit_mi_report_perf_count(perf_ctx->ctx, query->oa.bo, 0,
- query->oa.begin_report_id);
- snapshot_freq_register(perf_ctx, query, MI_FREQ_START_OFFSET_BYTES);
-
- ++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++;
-
- gen_perf_query_result_clear(&query->oa.result);
- query->oa.results_accumulated = false;
-
- add_to_unaccumulated_query_list(perf_ctx, query);
- break;
- }
-
- case GEN_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
-gen_perf_end_query(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query)
-{
- struct gen_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 GEN_PERF_QUERY_TYPE_OA:
- case GEN_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) {
- /* Take an ending OA counter snapshot. */
- snapshot_freq_register(perf_ctx, query, MI_FREQ_END_OFFSET_BYTES);
- perf_cfg->vtbl.emit_mi_report_perf_count(perf_ctx->ctx, query->oa.bo,
- MI_RPC_BO_END_OFFSET_BYTES,
- query->oa.begin_report_id + 1);
- }
-
- --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 GEN_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;
- }
-}
-
-enum OaReadStatus {
- OA_READ_STATUS_ERROR,
- OA_READ_STATUS_UNFINISHED,
- OA_READ_STATUS_FINISHED,
-};
-
-static enum OaReadStatus
-read_oa_samples_until(struct gen_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;
-
- while (1) {
- struct oa_sample_buf *buf = get_free_sample_buf(perf_ctx);
- uint32_t offset;
- int len;
-
- while ((len = read(perf_ctx->oa_stream_fd, buf->buf,
- sizeof(buf->buf))) < 0 && errno == EINTR)
- ;
-
- if (len <= 0) {
- exec_list_push_tail(&perf_ctx->free_sample_buffers, &buf->link);
-
- if (len < 0) {
- if (errno == EAGAIN) {
- return ((last_timestamp - start_timestamp) < INT32_MAX &&
- (last_timestamp - start_timestamp) >=
- (end_timestamp - start_timestamp)) ?
- OA_READ_STATUS_FINISHED :
- OA_READ_STATUS_UNFINISHED;
- } else {
- DBG("Error reading i915 perf samples: %m\n");
- }
- } else
- DBG("Spurious EOF reading i915 perf samples\n");
-
- return OA_READ_STATUS_ERROR;
- }
-
- 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 drm_i915_perf_record_header *header =
- (const struct drm_i915_perf_record_header *) &buf->buf[offset];
- uint32_t *report = (uint32_t *) (header + 1);
-
- if (header->type == DRM_I915_PERF_RECORD_SAMPLE)
- last_timestamp = report[1];
-
- offset += header->size;
- }
-
- 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 gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query,
- void *current_batch)
-{
- uint32_t *start;
- uint32_t *last;
- uint32_t *end;
- struct gen_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 + MI_RPC_BO_END_OFFSET_BYTES;
-
- 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 and 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
-gen_perf_wait_query(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query,
- void *current_batch)
-{
- struct gen_perf_config *perf_cfg = perf_ctx->perf;
- struct brw_bo *bo = NULL;
-
- switch (query->queryinfo->kind) {
- case GEN_PERF_QUERY_TYPE_OA:
- case GEN_PERF_QUERY_TYPE_RAW:
- bo = query->oa.bo;
- break;
-
- case GEN_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);
-
- /* Due to a race condition between the OA unit signaling report
- * availability and the report actually being written into memory,
- * we need to wait for all the reports to come in before we can
- * read them.
- */
- if (query->queryinfo->kind == GEN_PERF_QUERY_TYPE_OA ||
- query->queryinfo->kind == GEN_PERF_QUERY_TYPE_RAW) {
- while (!read_oa_samples_for_query(perf_ctx, query, current_batch))
- ;
- }
-}
-
-bool
-gen_perf_is_query_ready(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query,
- void *current_batch)
-{
- struct gen_perf_config *perf_cfg = perf_ctx->perf;
-
- switch (query->queryinfo->kind) {
- case GEN_PERF_QUERY_TYPE_OA:
- case GEN_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) &&
- read_oa_samples_for_query(perf_ctx, query, current_batch)));
- case GEN_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 gen_perf_context *perf_ctx,
- struct gen_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 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);
-
- 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 gen_device_info *devinfo,
- const uint32_t *report)
-{
- assert(devinfo->gen >= 8);
- if (devinfo->gen == 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 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 last_report_ctx_match = 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;
- }
-
- /* On Gen12+ 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->gen >= 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 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 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 (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) {
- /* 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) {
- gen_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 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);
- 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)
-{
- struct gen_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 GEN_PERF_QUERY_TYPE_OA:
- case GEN_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 GEN_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);
- gen_perf_close(perf_ctx, query->queryinfo);
- }
-
- 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;
-}
-
-void
-gen_perf_dump_query_count(struct gen_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
-gen_perf_dump_query(struct gen_perf_context *ctx,
- struct gen_perf_query_object *obj,
- void *current_batch)
-{
- switch (obj->queryinfo->kind) {
- case GEN_PERF_QUERY_TYPE_OA:
- case GEN_PERF_QUERY_TYPE_RAW:
- DBG("BO: %-4s OA data: %-10s %-15s\n",
- obj->oa.bo ? "yes," : "no,",
- gen_perf_is_query_ready(ctx, obj, current_batch) ? "ready," : "not ready,",
- obj->oa.results_accumulated ? "accumulated" : "not accumulated");
- break;
- case GEN_PERF_QUERY_TYPE_PIPELINE:
- DBG("BO: %-4s\n",
- obj->pipeline_stats.bo ? "yes" : "no");
- break;
- default:
- unreachable("Unknown query type");
- break;
- }
-}
} vtbl;
};
-struct gen_perf_query_object;
-const struct gen_perf_query_info* gen_perf_query_info(const struct gen_perf_query_object *);
-
void gen_perf_init_metrics(struct gen_perf_config *perf_cfg,
const struct gen_device_info *devinfo,
int drm_fd);
const uint32_t *end);
void gen_perf_query_result_clear(struct gen_perf_query_result *result);
-struct gen_perf_context;
-struct gen_perf_context *gen_perf_new_context(void *parent);
-
-void gen_perf_init_context(struct gen_perf_context *perf_ctx,
- struct gen_perf_config *perf_cfg,
- void * ctx, /* driver context (eg, brw_context) */
- void * bufmgr, /* eg brw_bufmgr */
- const struct gen_device_info *devinfo,
- uint32_t hw_ctx,
- int drm_fd);
-
-struct gen_perf_config *gen_perf_config(struct gen_perf_context *ctx);
-
-int gen_perf_active_queries(struct gen_perf_context *perf_ctx,
- const struct gen_perf_query_info *query);
-
static inline size_t
gen_perf_query_counter_get_size(const struct gen_perf_query_counter *counter)
{
return perf;
}
-struct gen_perf_query_object *
-gen_perf_new_query(struct gen_perf_context *, unsigned query_index);
-
-
-bool gen_perf_begin_query(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query);
-void gen_perf_end_query(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query);
-void gen_perf_wait_query(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query,
- void *current_batch);
-bool gen_perf_is_query_ready(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query,
- void *current_batch);
-void gen_perf_delete_query(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *query);
-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);
-
-void gen_perf_dump_query_count(struct gen_perf_context *perf_ctx);
-void gen_perf_dump_query(struct gen_perf_context *perf_ctx,
- struct gen_perf_query_object *obj,
- void *current_batch);
-
#endif /* GEN_PERF_H */
--- /dev/null
+/*
+ * 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 "common/gen_gem.h"
+
+#include "dev/gen_debug.h"
+#include "dev/gen_device_info.h"
+
+#include "perf/gen_perf.h"
+#include "perf/gen_perf_mdapi.h"
+#include "perf/gen_perf_query.h"
+#include "perf/gen_perf_regs.h"
+
+#include "drm-uapi/i915_drm.h"
+
+#include "util/u_math.h"
+
+#define FILE_DEBUG_FLAG DEBUG_PERFMON
+#define MI_RPC_BO_SIZE 4096
+#define MI_FREQ_START_OFFSET_BYTES (3072)
+#define MI_RPC_BO_END_OFFSET_BYTES (MI_RPC_BO_SIZE / 2)
+#define MI_FREQ_END_OFFSET_BYTES (3076)
+
+#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;
+ uint8_t buf[I915_PERF_OA_SAMPLE_SIZE * 10];
+ uint32_t last_timestamp;
+};
+
+/**
+ * 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 gen_perf_query_object
+{
+ const struct gen_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;
+
+ /**
+ * Frequency of the GT at begin and end of the query.
+ */
+ uint64_t gt_frequency[2];
+
+ /**
+ * Accumulated OA results between begin and end of the query.
+ */
+ struct gen_perf_query_result result;
+ } oa;
+
+ struct {
+ /**
+ * BO containing starting and ending snapshots for the
+ * statistics counters.
+ */
+ void *bo;
+ } pipeline_stats;
+ };
+};
+
+struct gen_perf_context {
+ struct gen_perf_config *perf;
+
+ void * ctx; /* driver context (eg, brw_context) */
+ void * bufmgr;
+ const struct gen_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 gen_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;
+};
+
+static bool
+inc_n_users(struct gen_perf_context *perf_ctx)
+{
+ if (perf_ctx->n_oa_users == 0 &&
+ gen_ioctl(perf_ctx->oa_stream_fd, I915_PERF_IOCTL_ENABLE, 0) < 0)
+ {
+ return false;
+ }
+ ++perf_ctx->n_oa_users;
+
+ return true;
+}
+
+static void
+dec_n_users(struct gen_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 &&
+ gen_ioctl(perf_ctx->oa_stream_fd, I915_PERF_IOCTL_DISABLE, 0) < 0)
+ {
+ DBG("WARNING: Error disabling gen perf stream: %m\n");
+ }
+}
+
+static void
+gen_perf_close(struct gen_perf_context *perfquery,
+ const struct gen_perf_query_info *query)
+{
+ if (perfquery->oa_stream_fd != -1) {
+ close(perfquery->oa_stream_fd);
+ perfquery->oa_stream_fd = -1;
+ }
+ if (query->kind == GEN_PERF_QUERY_TYPE_RAW) {
+ struct gen_perf_query_info *raw_query =
+ (struct gen_perf_query_info *) query;
+ raw_query->oa_metrics_set_id = 0;
+ }
+}
+
+static bool
+gen_perf_open(struct gen_perf_context *perf_ctx,
+ int metrics_set_id,
+ int report_format,
+ int period_exponent,
+ int drm_fd,
+ uint32_t ctx_id)
+{
+ uint64_t properties[] = {
+ /* Single context sampling */
+ DRM_I915_PERF_PROP_CTX_HANDLE, ctx_id,
+
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, metrics_set_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, report_format,
+ DRM_I915_PERF_PROP_OA_EXPONENT, period_exponent,
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC |
+ I915_PERF_FLAG_FD_NONBLOCK |
+ I915_PERF_FLAG_DISABLED,
+ .num_properties = ARRAY_SIZE(properties) / 2,
+ .properties_ptr = (uintptr_t) properties,
+ };
+ int fd = gen_ioctl(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m);
+ 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;
+
+ return true;
+}
+
+static uint64_t
+get_metric_id(struct gen_perf_config *perf,
+ const struct gen_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 == GEN_PERF_QUERY_TYPE_OA)
+ return query->oa_metrics_set_id;
+
+ assert(query->kind == GEN_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 gen_perf_query_info *raw_query = (struct gen_perf_query_info *)query;
+ if (!gen_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 = 1ULL;
+ } 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 gen_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));
+
+ exec_node_init(&buf->link);
+ buf->refcount = 0;
+ }
+ buf->len = 0;
+
+ return buf;
+}
+
+static void
+reap_old_sample_buffers(struct gen_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 gen_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 gen_perf_query_object *
+gen_perf_new_query(struct gen_perf_context *perf_ctx, unsigned query_index)
+{
+ const struct gen_perf_query_info *query =
+ &perf_ctx->perf->queries[query_index];
+ struct gen_perf_query_object *obj =
+ calloc(1, sizeof(struct gen_perf_query_object));
+
+ if (!obj)
+ return NULL;
+
+ obj->queryinfo = query;
+
+ perf_ctx->n_query_instances++;
+ return obj;
+}
+
+int
+gen_perf_active_queries(struct gen_perf_context *perf_ctx,
+ const struct gen_perf_query_info *query)
+{
+ assert(perf_ctx->n_active_oa_queries == 0 || perf_ctx->n_active_pipeline_stats_queries == 0);
+
+ switch (query->kind) {
+ case GEN_PERF_QUERY_TYPE_OA:
+ case GEN_PERF_QUERY_TYPE_RAW:
+ return perf_ctx->n_active_oa_queries;
+ break;
+
+ case GEN_PERF_QUERY_TYPE_PIPELINE:
+ return perf_ctx->n_active_pipeline_stats_queries;
+ break;
+
+ default:
+ unreachable("Unknown query type");
+ break;
+ }
+}
+
+const struct gen_perf_query_info*
+gen_perf_query_info(const struct gen_perf_query_object *query)
+{
+ return query->queryinfo;
+}
+
+struct gen_perf_context *
+gen_perf_new_context(void *parent)
+{
+ struct gen_perf_context *ctx = rzalloc(parent, struct gen_perf_context);
+ if (! ctx)
+ fprintf(stderr, "%s: failed to alloc context\n", __func__);
+ return ctx;
+}
+
+struct gen_perf_config *
+gen_perf_config(struct gen_perf_context *ctx)
+{
+ return ctx->perf;
+}
+
+void
+gen_perf_init_context(struct gen_perf_context *perf_ctx,
+ struct gen_perf_config *perf_cfg,
+ void * ctx, /* driver context (eg, brw_context) */
+ void * bufmgr, /* eg brw_bufmgr */
+ const struct gen_device_info *devinfo,
+ uint32_t hw_ctx,
+ int drm_fd)
+{
+ perf_ctx->perf = perf_cfg;
+ 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(ctx, struct gen_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;
+}
+
+/**
+ * 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 gen_perf_context *perf_ctx,
+ struct gen_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->ctx, perf_ctx->unaccumulated,
+ struct gen_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 gen_perf_context *ctx,
+ struct gen_perf_query_object *obj,
+ uint32_t offset_in_bytes)
+{
+ struct gen_perf_config *perf = ctx->perf;
+ const struct gen_perf_query_info *query = obj->queryinfo;
+ const int n_counters = query->n_counters;
+
+ for (int i = 0; i < n_counters; i++) {
+ const struct gen_perf_query_counter *counter = &query->counters[i];
+
+ assert(counter->data_type == GEN_PERF_COUNTER_DATA_TYPE_UINT64);
+
+ perf->vtbl.store_register_mem(ctx->ctx, obj->pipeline_stats.bo,
+ counter->pipeline_stat.reg, 8,
+ offset_in_bytes + i * sizeof(uint64_t));
+ }
+}
+
+static void
+snapshot_freq_register(struct gen_perf_context *ctx,
+ struct gen_perf_query_object *query,
+ uint32_t bo_offset)
+{
+ struct gen_perf_config *perf = ctx->perf;
+ const struct gen_device_info *devinfo = ctx->devinfo;
+
+ if (devinfo->gen == 8 && !devinfo->is_cherryview)
+ perf->vtbl.store_register_mem(ctx->ctx, query->oa.bo, GEN7_RPSTAT1, 4, bo_offset);
+ else if (devinfo->gen >= 9)
+ perf->vtbl.store_register_mem(ctx->ctx, query->oa.bo, GEN9_RPSTAT0, 4, bo_offset);
+}
+
+bool
+gen_perf_begin_query(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query)
+{
+ struct gen_perf_config *perf_cfg = perf_ctx->perf;
+ const struct gen_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 GEN_PERF_QUERY_TYPE_OA:
+ case GEN_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
+ gen_perf_close(perf_ctx, queryinfo);
+ }
+
+ /* If the OA counters aren't already on, enable them. */
+ if (perf_ctx->oa_stream_fd == -1) {
+ const struct gen_device_info *devinfo = perf_ctx->devinfo;
+
+ /* The period_exponent gives a sampling period as follows:
+ * sample_period = timestamp_period * 2^(period_exponent + 1)
+ *
+ * The timestamps increments every 80ns (HSW), ~52ns (GEN9LP) or
+ * ~83ns (GEN8/9).
+ *
+ * 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_gen_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->gen >= 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;
+ }
+
+ if (period_exponent == 0) {
+ DBG("WARNING: enable to find a sampling exponent\n");
+ return false;
+ }
+
+ DBG("OA sampling exponent: %i ~= %"PRIu64"ms\n", period_exponent,
+ prev_sample_period / 1000000ul);
+
+ if (!gen_perf_open(perf_ctx, metric_id, queryinfo->oa_format,
+ period_exponent, perf_ctx->drm_fd,
+ perf_ctx->hw_ctx))
+ 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);
+#ifdef 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;
+
+ /* Take a starting OA counter snapshot. */
+ perf_cfg->vtbl.emit_mi_report_perf_count(perf_ctx->ctx, query->oa.bo, 0,
+ query->oa.begin_report_id);
+ snapshot_freq_register(perf_ctx, query, MI_FREQ_START_OFFSET_BYTES);
+
+ ++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++;
+
+ gen_perf_query_result_clear(&query->oa.result);
+ query->oa.results_accumulated = false;
+
+ add_to_unaccumulated_query_list(perf_ctx, query);
+ break;
+ }
+
+ case GEN_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
+gen_perf_end_query(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query)
+{
+ struct gen_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 GEN_PERF_QUERY_TYPE_OA:
+ case GEN_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) {
+ /* Take an ending OA counter snapshot. */
+ snapshot_freq_register(perf_ctx, query, MI_FREQ_END_OFFSET_BYTES);
+ perf_cfg->vtbl.emit_mi_report_perf_count(perf_ctx->ctx, query->oa.bo,
+ MI_RPC_BO_END_OFFSET_BYTES,
+ query->oa.begin_report_id + 1);
+ }
+
+ --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 GEN_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;
+ }
+}
+
+enum OaReadStatus {
+ OA_READ_STATUS_ERROR,
+ OA_READ_STATUS_UNFINISHED,
+ OA_READ_STATUS_FINISHED,
+};
+
+static enum OaReadStatus
+read_oa_samples_until(struct gen_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;
+
+ while (1) {
+ struct oa_sample_buf *buf = get_free_sample_buf(perf_ctx);
+ uint32_t offset;
+ int len;
+
+ while ((len = read(perf_ctx->oa_stream_fd, buf->buf,
+ sizeof(buf->buf))) < 0 && errno == EINTR)
+ ;
+
+ if (len <= 0) {
+ exec_list_push_tail(&perf_ctx->free_sample_buffers, &buf->link);
+
+ if (len < 0) {
+ if (errno == EAGAIN) {
+ return ((last_timestamp - start_timestamp) < INT32_MAX &&
+ (last_timestamp - start_timestamp) >=
+ (end_timestamp - start_timestamp)) ?
+ OA_READ_STATUS_FINISHED :
+ OA_READ_STATUS_UNFINISHED;
+ } else {
+ DBG("Error reading i915 perf samples: %m\n");
+ }
+ } else
+ DBG("Spurious EOF reading i915 perf samples\n");
+
+ return OA_READ_STATUS_ERROR;
+ }
+
+ 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 drm_i915_perf_record_header *header =
+ (const struct drm_i915_perf_record_header *) &buf->buf[offset];
+ uint32_t *report = (uint32_t *) (header + 1);
+
+ if (header->type == DRM_I915_PERF_RECORD_SAMPLE)
+ last_timestamp = report[1];
+
+ offset += header->size;
+ }
+
+ 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 gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query,
+ void *current_batch)
+{
+ uint32_t *start;
+ uint32_t *last;
+ uint32_t *end;
+ struct gen_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 + MI_RPC_BO_END_OFFSET_BYTES;
+
+ 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 and 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
+gen_perf_wait_query(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query,
+ void *current_batch)
+{
+ struct gen_perf_config *perf_cfg = perf_ctx->perf;
+ struct brw_bo *bo = NULL;
+
+ switch (query->queryinfo->kind) {
+ case GEN_PERF_QUERY_TYPE_OA:
+ case GEN_PERF_QUERY_TYPE_RAW:
+ bo = query->oa.bo;
+ break;
+
+ case GEN_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);
+
+ /* Due to a race condition between the OA unit signaling report
+ * availability and the report actually being written into memory,
+ * we need to wait for all the reports to come in before we can
+ * read them.
+ */
+ if (query->queryinfo->kind == GEN_PERF_QUERY_TYPE_OA ||
+ query->queryinfo->kind == GEN_PERF_QUERY_TYPE_RAW) {
+ while (!read_oa_samples_for_query(perf_ctx, query, current_batch))
+ ;
+ }
+}
+
+bool
+gen_perf_is_query_ready(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query,
+ void *current_batch)
+{
+ struct gen_perf_config *perf_cfg = perf_ctx->perf;
+
+ switch (query->queryinfo->kind) {
+ case GEN_PERF_QUERY_TYPE_OA:
+ case GEN_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) &&
+ read_oa_samples_for_query(perf_ctx, query, current_batch)));
+ case GEN_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 gen_perf_context *perf_ctx,
+ struct gen_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 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);
+
+ 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 gen_device_info *devinfo,
+ const uint32_t *report)
+{
+ assert(devinfo->gen >= 8);
+ if (devinfo->gen == 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 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 last_report_ctx_match = 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;
+ }
+
+ /* On Gen12+ 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->gen >= 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 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 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 (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) {
+ /* 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) {
+ gen_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 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);
+ 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)
+{
+ struct gen_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 GEN_PERF_QUERY_TYPE_OA:
+ case GEN_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 GEN_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);
+ gen_perf_close(perf_ctx, query->queryinfo);
+ }
+
+ 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;
+}
+
+void
+gen_perf_dump_query_count(struct gen_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
+gen_perf_dump_query(struct gen_perf_context *ctx,
+ struct gen_perf_query_object *obj,
+ void *current_batch)
+{
+ switch (obj->queryinfo->kind) {
+ case GEN_PERF_QUERY_TYPE_OA:
+ case GEN_PERF_QUERY_TYPE_RAW:
+ DBG("BO: %-4s OA data: %-10s %-15s\n",
+ obj->oa.bo ? "yes," : "no,",
+ gen_perf_is_query_ready(ctx, obj, current_batch) ? "ready," : "not ready,",
+ obj->oa.results_accumulated ? "accumulated" : "not accumulated");
+ break;
+ case GEN_PERF_QUERY_TYPE_PIPELINE:
+ DBG("BO: %-4s\n",
+ obj->pipeline_stats.bo ? "yes" : "no");
+ break;
+ default:
+ unreachable("Unknown query type");
+ break;
+ }
+}
--- /dev/null
+/*
+ * 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.
+ */
+
+#ifndef GEN_PERF_QUERY_H
+#define GEN_PERF_QUERY_H
+
+#include <stdint.h>
+
+struct gen_device_info;
+
+struct gen_perf_config;
+struct gen_perf_context;
+struct gen_perf_query_object;
+
+struct gen_perf_context *gen_perf_new_context(void *parent);
+
+void gen_perf_init_context(struct gen_perf_context *perf_ctx,
+ struct gen_perf_config *perf_cfg,
+ void * ctx, /* driver context (eg, brw_context) */
+ void * bufmgr, /* eg brw_bufmgr */
+ const struct gen_device_info *devinfo,
+ uint32_t hw_ctx,
+ int drm_fd);
+
+const struct gen_perf_query_info* gen_perf_query_info(const struct gen_perf_query_object *);
+
+
+void gen_perf_init_context(struct gen_perf_context *perf_ctx,
+ struct gen_perf_config *perf_cfg,
+ void * ctx, /* driver context (eg, brw_context) */
+ void * bufmgr, /* eg brw_bufmgr */
+ const struct gen_device_info *devinfo,
+ uint32_t hw_ctx,
+ int drm_fd);
+
+struct gen_perf_config *gen_perf_config(struct gen_perf_context *ctx);
+
+int gen_perf_active_queries(struct gen_perf_context *perf_ctx,
+ const struct gen_perf_query_info *query);
+
+struct gen_perf_query_object *
+gen_perf_new_query(struct gen_perf_context *, unsigned query_index);
+
+
+bool gen_perf_begin_query(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query);
+void gen_perf_end_query(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query);
+void gen_perf_wait_query(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query,
+ void *current_batch);
+bool gen_perf_is_query_ready(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query,
+ void *current_batch);
+void gen_perf_delete_query(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *query);
+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);
+
+void gen_perf_dump_query_count(struct gen_perf_context *perf_ctx);
+void gen_perf_dump_query(struct gen_perf_context *perf_ctx,
+ struct gen_perf_query_object *obj,
+ void *current_batch);
+
+#endif /* GEN_PERF_QUERY_H */
gen_perf_sources = [
'gen_perf.c',
+ 'gen_perf_query.c',
'gen_perf_mdapi.c',
]
#include "intel_screen.h"
#include "intel_tex_obj.h"
#include "perf/gen_perf.h"
+#include "perf/gen_perf_query.h"
#ifdef __cplusplus
extern "C" {
#include "perf/gen_perf.h"
#include "perf/gen_perf_regs.h"
#include "perf/gen_perf_mdapi.h"
+#include "perf/gen_perf_query.h"
#define FILE_DEBUG_FLAG DEBUG_PERFMON
projects / mesa.git / commitdiff