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142 lines
3.5 KiB
142 lines
3.5 KiB
// 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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