| .. | .. |
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| 1 | 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | | -#include <stdbool.h> |
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| 3 | | -#include <errno.h> |
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| 4 | | - |
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| 5 | | -#include <linux/stddef.h> |
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| 6 | | -#include <linux/perf_event.h> |
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| 7 | | - |
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| 8 | | -#include "../../perf.h" |
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| 9 | 2 | #include <linux/types.h> |
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| 10 | | -#include "../../util/debug.h" |
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| 11 | | -#include "../../util/tsc.h" |
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| 12 | 3 | |
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| 13 | | -int perf_read_tsc_conversion(const struct perf_event_mmap_page *pc, |
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| 14 | | - struct perf_tsc_conversion *tc) |
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| 15 | | -{ |
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| 16 | | - bool cap_user_time_zero; |
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| 17 | | - u32 seq; |
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| 18 | | - int i = 0; |
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| 19 | | - |
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| 20 | | - while (1) { |
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| 21 | | - seq = pc->lock; |
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| 22 | | - rmb(); |
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| 23 | | - tc->time_mult = pc->time_mult; |
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| 24 | | - tc->time_shift = pc->time_shift; |
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| 25 | | - tc->time_zero = pc->time_zero; |
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| 26 | | - cap_user_time_zero = pc->cap_user_time_zero; |
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| 27 | | - rmb(); |
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| 28 | | - if (pc->lock == seq && !(seq & 1)) |
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| 29 | | - break; |
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| 30 | | - if (++i > 10000) { |
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| 31 | | - pr_debug("failed to get perf_event_mmap_page lock\n"); |
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| 32 | | - return -EINVAL; |
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| 33 | | - } |
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| 34 | | - } |
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| 35 | | - |
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| 36 | | - if (!cap_user_time_zero) |
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| 37 | | - return -EOPNOTSUPP; |
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| 38 | | - |
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| 39 | | - return 0; |
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| 40 | | -} |
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| 4 | +#include "../../../util/tsc.h" |
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| 41 | 5 | |
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| 42 | 6 | u64 rdtsc(void) |
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| 43 | 7 | { |
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| .. | .. |
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| 46 | 10 | asm volatile("rdtsc" : "=a" (low), "=d" (high)); |
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| 47 | 11 | |
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| 48 | 12 | return low | ((u64)high) << 32; |
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| 49 | | -} |
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| 50 | | - |
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| 51 | | -int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc, |
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| 52 | | - struct perf_tool *tool, |
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| 53 | | - perf_event__handler_t process, |
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| 54 | | - struct machine *machine) |
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| 55 | | -{ |
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| 56 | | - union perf_event event = { |
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| 57 | | - .time_conv = { |
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| 58 | | - .header = { |
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| 59 | | - .type = PERF_RECORD_TIME_CONV, |
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| 60 | | - .size = sizeof(struct time_conv_event), |
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| 61 | | - }, |
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| 62 | | - }, |
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| 63 | | - }; |
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| 64 | | - struct perf_tsc_conversion tc; |
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| 65 | | - int err; |
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| 66 | | - |
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| 67 | | - if (!pc) |
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| 68 | | - return 0; |
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| 69 | | - err = perf_read_tsc_conversion(pc, &tc); |
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| 70 | | - if (err == -EOPNOTSUPP) |
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| 71 | | - return 0; |
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| 72 | | - if (err) |
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| 73 | | - return err; |
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| 74 | | - |
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| 75 | | - pr_debug2("Synthesizing TSC conversion information\n"); |
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| 76 | | - |
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| 77 | | - event.time_conv.time_mult = tc.time_mult; |
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| 78 | | - event.time_conv.time_shift = tc.time_shift; |
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| 79 | | - event.time_conv.time_zero = tc.time_zero; |
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| 80 | | - |
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| 81 | | - return process(tool, &event, NULL, machine); |
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| 82 | 13 | } |
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