d944c4eebc
Combine all definitions into a common tools/include/linux/types.h and kill the wild growth elsewhere. Move DECLARE_BITMAP to its proper bitmap.h header. Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Link: http://lkml.kernel.org/n/tip-azczs7qcv6h9xek9od10hiv2@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
#include <stdbool.h>
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#include <errno.h>
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#include <linux/perf_event.h>
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#include "../../perf.h"
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#include <linux/types.h>
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#include "../../util/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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quot = cyc >> tc->time_shift;
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rem = cyc & ((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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bool cap_user_time_zero;
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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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cap_user_time_zero = pc->cap_user_time_zero;
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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 (!cap_user_time_zero)
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return -EOPNOTSUPP;
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return 0;
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}
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