From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- tools/perf/util/stream.c | 341 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 341 insertions(+) create mode 100644 tools/perf/util/stream.c (limited to 'tools/perf/util/stream.c') diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c new file mode 100644 index 000000000..7bccd2378 --- /dev/null +++ b/tools/perf/util/stream.c @@ -0,0 +1,341 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Compare and figure out the top N hottest streams + * Copyright (c) 2020, Intel Corporation. + * Author: Jin Yao + */ + +#include +#include +#include +#include "debug.h" +#include "hist.h" +#include "sort.h" +#include "stream.h" +#include "evlist.h" + +static void evsel_streams__delete(struct evsel_streams *es, int nr_evsel) +{ + for (int i = 0; i < nr_evsel; i++) + zfree(&es[i].streams); + + free(es); +} + +void evlist_streams__delete(struct evlist_streams *els) +{ + evsel_streams__delete(els->ev_streams, els->nr_evsel); + free(els); +} + +static struct evlist_streams *evlist_streams__new(int nr_evsel, + int nr_streams_max) +{ + struct evlist_streams *els; + struct evsel_streams *es; + + els = zalloc(sizeof(*els)); + if (!els) + return NULL; + + es = calloc(nr_evsel, sizeof(struct evsel_streams)); + if (!es) { + free(els); + return NULL; + } + + for (int i = 0; i < nr_evsel; i++) { + struct evsel_streams *s = &es[i]; + + s->streams = calloc(nr_streams_max, sizeof(struct stream)); + if (!s->streams) + goto err; + + s->nr_streams_max = nr_streams_max; + } + + els->ev_streams = es; + els->nr_evsel = nr_evsel; + return els; + +err: + evsel_streams__delete(es, nr_evsel); + return NULL; +} + +/* + * The cnodes with high hit number are hot callchains. + */ +static void evsel_streams__set_hot_cnode(struct evsel_streams *es, + struct callchain_node *cnode) +{ + int i, idx = 0; + u64 hit; + + if (es->nr_streams < es->nr_streams_max) { + i = es->nr_streams; + es->streams[i].cnode = cnode; + es->nr_streams++; + return; + } + + /* + * Considering a few number of hot streams, only use simple + * way to find the cnode with smallest hit number and replace. + */ + hit = (es->streams[0].cnode)->hit; + for (i = 1; i < es->nr_streams; i++) { + if ((es->streams[i].cnode)->hit < hit) { + hit = (es->streams[i].cnode)->hit; + idx = i; + } + } + + if (cnode->hit > hit) + es->streams[idx].cnode = cnode; +} + +static void update_hot_callchain(struct hist_entry *he, + struct evsel_streams *es) +{ + struct rb_root *root = &he->sorted_chain; + struct rb_node *rb_node = rb_first(root); + struct callchain_node *cnode; + + while (rb_node) { + cnode = rb_entry(rb_node, struct callchain_node, rb_node); + evsel_streams__set_hot_cnode(es, cnode); + rb_node = rb_next(rb_node); + } +} + +static void init_hot_callchain(struct hists *hists, struct evsel_streams *es) +{ + struct rb_node *next = rb_first_cached(&hists->entries); + + while (next) { + struct hist_entry *he; + + he = rb_entry(next, struct hist_entry, rb_node); + update_hot_callchain(he, es); + next = rb_next(&he->rb_node); + } + + es->streams_hits = callchain_total_hits(hists); +} + +static int evlist__init_callchain_streams(struct evlist *evlist, + struct evlist_streams *els) +{ + struct evsel_streams *es = els->ev_streams; + struct evsel *pos; + int i = 0; + + BUG_ON(els->nr_evsel < evlist__nr_entries(evlist)); + + evlist__for_each_entry(evlist, pos) { + struct hists *hists = evsel__hists(pos); + + hists__output_resort(hists, NULL); + init_hot_callchain(hists, &es[i]); + es[i].evsel = pos; + i++; + } + + return 0; +} + +struct evlist_streams *evlist__create_streams(struct evlist *evlist, + int nr_streams_max) +{ + int nr_evsel = evlist__nr_entries(evlist), ret = -1; + struct evlist_streams *els = evlist_streams__new(nr_evsel, + nr_streams_max); + + if (!els) + return NULL; + + ret = evlist__init_callchain_streams(evlist, els); + if (ret) { + evlist_streams__delete(els); + return NULL; + } + + return els; +} + +struct evsel_streams *evsel_streams__entry(struct evlist_streams *els, + const struct evsel *evsel) +{ + struct evsel_streams *es = els->ev_streams; + + for (int i = 0; i < els->nr_evsel; i++) { + if (es[i].evsel == evsel) + return &es[i]; + } + + return NULL; +} + +static struct stream *stream__callchain_match(struct stream *base_stream, + struct evsel_streams *es_pair) +{ + for (int i = 0; i < es_pair->nr_streams; i++) { + struct stream *pair_stream = &es_pair->streams[i]; + + if (callchain_cnode_matched(base_stream->cnode, + pair_stream->cnode)) { + return pair_stream; + } + } + + return NULL; +} + +static struct stream *stream__match(struct stream *base_stream, + struct evsel_streams *es_pair) +{ + return stream__callchain_match(base_stream, es_pair); +} + +static void stream__link(struct stream *base_stream, struct stream *pair_stream) +{ + base_stream->pair_cnode = pair_stream->cnode; + pair_stream->pair_cnode = base_stream->cnode; +} + +void evsel_streams__match(struct evsel_streams *es_base, + struct evsel_streams *es_pair) +{ + for (int i = 0; i < es_base->nr_streams; i++) { + struct stream *base_stream = &es_base->streams[i]; + struct stream *pair_stream; + + pair_stream = stream__match(base_stream, es_pair); + if (pair_stream) + stream__link(base_stream, pair_stream); + } +} + +static void print_callchain_pair(struct stream *base_stream, int idx, + struct evsel_streams *es_base, + struct evsel_streams *es_pair) +{ + struct callchain_node *base_cnode = base_stream->cnode; + struct callchain_node *pair_cnode = base_stream->pair_cnode; + struct callchain_list *base_chain, *pair_chain; + char buf1[512], buf2[512], cbuf1[256], cbuf2[256]; + char *s1, *s2; + double pct; + + printf("\nhot chain pair %d:\n", idx); + + pct = (double)base_cnode->hit / (double)es_base->streams_hits; + scnprintf(buf1, sizeof(buf1), "cycles: %ld, hits: %.2f%%", + callchain_avg_cycles(base_cnode), pct * 100.0); + + pct = (double)pair_cnode->hit / (double)es_pair->streams_hits; + scnprintf(buf2, sizeof(buf2), "cycles: %ld, hits: %.2f%%", + callchain_avg_cycles(pair_cnode), pct * 100.0); + + printf("%35s\t%35s\n", buf1, buf2); + + printf("%35s\t%35s\n", + "---------------------------", + "--------------------------"); + + pair_chain = list_first_entry(&pair_cnode->val, + struct callchain_list, + list); + + list_for_each_entry(base_chain, &base_cnode->val, list) { + if (&pair_chain->list == &pair_cnode->val) + return; + + s1 = callchain_list__sym_name(base_chain, cbuf1, sizeof(cbuf1), + false); + s2 = callchain_list__sym_name(pair_chain, cbuf2, sizeof(cbuf2), + false); + + scnprintf(buf1, sizeof(buf1), "%35s\t%35s", s1, s2); + printf("%s\n", buf1); + pair_chain = list_next_entry(pair_chain, list); + } +} + +static void print_stream_callchain(struct stream *stream, int idx, + struct evsel_streams *es, bool pair) +{ + struct callchain_node *cnode = stream->cnode; + struct callchain_list *chain; + char buf[512], cbuf[256], *s; + double pct; + + printf("\nhot chain %d:\n", idx); + + pct = (double)cnode->hit / (double)es->streams_hits; + scnprintf(buf, sizeof(buf), "cycles: %ld, hits: %.2f%%", + callchain_avg_cycles(cnode), pct * 100.0); + + if (pair) { + printf("%35s\t%35s\n", "", buf); + printf("%35s\t%35s\n", + "", "--------------------------"); + } else { + printf("%35s\n", buf); + printf("%35s\n", "--------------------------"); + } + + list_for_each_entry(chain, &cnode->val, list) { + s = callchain_list__sym_name(chain, cbuf, sizeof(cbuf), false); + + if (pair) + scnprintf(buf, sizeof(buf), "%35s\t%35s", "", s); + else + scnprintf(buf, sizeof(buf), "%35s", s); + + printf("%s\n", buf); + } +} + +static void callchain_streams_report(struct evsel_streams *es_base, + struct evsel_streams *es_pair) +{ + struct stream *base_stream; + int i, idx = 0; + + printf("[ Matched hot streams ]\n"); + for (i = 0; i < es_base->nr_streams; i++) { + base_stream = &es_base->streams[i]; + if (base_stream->pair_cnode) { + print_callchain_pair(base_stream, ++idx, + es_base, es_pair); + } + } + + idx = 0; + printf("\n[ Hot streams in old perf data only ]\n"); + for (i = 0; i < es_base->nr_streams; i++) { + base_stream = &es_base->streams[i]; + if (!base_stream->pair_cnode) { + print_stream_callchain(base_stream, ++idx, + es_base, false); + } + } + + idx = 0; + printf("\n[ Hot streams in new perf data only ]\n"); + for (i = 0; i < es_pair->nr_streams; i++) { + base_stream = &es_pair->streams[i]; + if (!base_stream->pair_cnode) { + print_stream_callchain(base_stream, ++idx, + es_pair, true); + } + } +} + +void evsel_streams__report(struct evsel_streams *es_base, + struct evsel_streams *es_pair) +{ + return callchain_streams_report(es_base, es_pair); +} -- cgit v1.3.1