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![Leo Yan](/assets/img/avatar_default.png)
Now perf tool uses the common stub function process_event_op2_stub() for dumping TIME_CONV event, thus it doesn't output the clock parameters contained in the event. This patch adds the callback function for dumping the hardware clock parameters in TIME_CONV event. Before: # perf report -D 0x978 [0x38]: event: 79 . . ... raw event: size 56 bytes . 0000: 4f 00 00 00 00 00 38 00 15 00 00 00 00 00 00 00 O.....8......... . 0010: 00 00 40 01 00 00 00 00 86 89 0b bf df ff ff ff ..@........<BF><DF><FF><FF><FF> . 0020: d1 c1 b2 39 03 00 00 00 ff ff ff ff ff ff ff 00 <D1><C1><B2>9....<FF><FF><FF><FF><FF><FF><FF>. . 0030: 01 01 00 00 00 00 00 00 ........ 0 0 0x978 [0x38]: PERF_RECORD_TIME_CONV : unhandled! [...] After: # perf report -D 0x978 [0x38]: event: 79 . . ... raw event: size 56 bytes . 0000: 4f 00 00 00 00 00 38 00 15 00 00 00 00 00 00 00 O.....8......... . 0010: 00 00 40 01 00 00 00 00 86 89 0b bf df ff ff ff ..@........<BF><DF><FF><FF><FF> . 0020: d1 c1 b2 39 03 00 00 00 ff ff ff ff ff ff ff 00 <D1><C1><B2>9....<FF><FF><FF><FF><FF><FF><FF>. . 0030: 01 01 00 00 00 00 00 00 ........ 0 0 0x978 [0x38]: PERF_RECORD_TIME_CONV ... Time Shift 21 ... Time Muliplier 20971520 ... Time Zero 18446743935180835206 ... Time Cycles 13852918225 ... Time Mask 0xffffffffffffff ... Cap Time Zero 1 ... Cap Time Short 1 : unhandled! [...] Signed-off-by: Leo Yan <leo.yan@linaro.org> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Gustavo A. R. Silva <gustavoars@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steve MacLean <Steve.MacLean@Microsoft.com> Cc: Yonatan Goldschmidt <yonatan.goldschmidt@granulate.io> Link: https://lore.kernel.org/r/20210428120915.7123-5-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <inttypes.h>
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#include <string.h>
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#include <linux/compiler.h>
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#include <linux/perf_event.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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#include <asm/barrier.h>
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#include "event.h"
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#include "synthetic-events.h"
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#include "debug.h"
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#include "tsc.h"
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u64 perf_time_to_tsc(u64 ns, struct perf_tsc_conversion *tc)
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{
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u64 t, quot, rem;
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t = ns - tc->time_zero;
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quot = t / tc->time_mult;
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rem = t % tc->time_mult;
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return (quot << tc->time_shift) +
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(rem << tc->time_shift) / tc->time_mult;
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}
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u64 tsc_to_perf_time(u64 cyc, struct perf_tsc_conversion *tc)
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{
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u64 quot, rem;
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if (tc->cap_user_time_short)
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cyc = tc->time_cycles +
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((cyc - tc->time_cycles) & tc->time_mask);
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quot = cyc >> tc->time_shift;
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rem = cyc & (((u64)1 << tc->time_shift) - 1);
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return tc->time_zero + quot * tc->time_mult +
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((rem * tc->time_mult) >> tc->time_shift);
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}
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int perf_read_tsc_conversion(const struct perf_event_mmap_page *pc,
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struct perf_tsc_conversion *tc)
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{
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u32 seq;
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int i = 0;
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while (1) {
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seq = pc->lock;
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rmb();
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tc->time_mult = pc->time_mult;
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tc->time_shift = pc->time_shift;
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tc->time_zero = pc->time_zero;
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tc->time_cycles = pc->time_cycles;
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tc->time_mask = pc->time_mask;
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tc->cap_user_time_zero = pc->cap_user_time_zero;
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tc->cap_user_time_short = pc->cap_user_time_short;
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rmb();
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if (pc->lock == seq && !(seq & 1))
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break;
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if (++i > 10000) {
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pr_debug("failed to get perf_event_mmap_page lock\n");
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return -EINVAL;
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}
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}
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if (!tc->cap_user_time_zero)
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return -EOPNOTSUPP;
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return 0;
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}
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int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc,
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struct perf_tool *tool,
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perf_event__handler_t process,
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struct machine *machine)
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{
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union perf_event event = {
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.time_conv = {
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.header = {
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.type = PERF_RECORD_TIME_CONV,
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.size = sizeof(struct perf_record_time_conv),
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},
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},
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};
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struct perf_tsc_conversion tc;
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int err;
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if (!pc)
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return 0;
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err = perf_read_tsc_conversion(pc, &tc);
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if (err == -EOPNOTSUPP)
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return 0;
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if (err)
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return err;
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pr_debug2("Synthesizing TSC conversion information\n");
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event.time_conv.time_mult = tc.time_mult;
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event.time_conv.time_shift = tc.time_shift;
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event.time_conv.time_zero = tc.time_zero;
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event.time_conv.time_cycles = tc.time_cycles;
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event.time_conv.time_mask = tc.time_mask;
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event.time_conv.cap_user_time_zero = tc.cap_user_time_zero;
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event.time_conv.cap_user_time_short = tc.cap_user_time_short;
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return process(tool, &event, NULL, machine);
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}
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u64 __weak rdtsc(void)
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{
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return 0;
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}
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size_t perf_event__fprintf_time_conv(union perf_event *event, FILE *fp)
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{
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struct perf_record_time_conv *tc = (struct perf_record_time_conv *)event;
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size_t ret;
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ret = fprintf(fp, "\n... Time Shift %" PRI_lu64 "\n", tc->time_shift);
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ret += fprintf(fp, "... Time Muliplier %" PRI_lu64 "\n", tc->time_mult);
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ret += fprintf(fp, "... Time Zero %" PRI_lu64 "\n", tc->time_zero);
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/*
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* The event TIME_CONV was extended for the fields from "time_cycles"
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* when supported cap_user_time_short, for backward compatibility,
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* prints the extended fields only if they are contained in the event.
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*/
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if (event_contains(*tc, time_cycles)) {
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ret += fprintf(fp, "... Time Cycles %" PRI_lu64 "\n",
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tc->time_cycles);
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ret += fprintf(fp, "... Time Mask %#" PRI_lx64 "\n",
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tc->time_mask);
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ret += fprintf(fp, "... Cap Time Zero %" PRId32 "\n",
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tc->cap_user_time_zero);
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ret += fprintf(fp, "... Cap Time Short %" PRId32 "\n",
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tc->cap_user_time_short);
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}
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return ret;
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}
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