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Rao" , Adrian Hunter , Mathieu Poirier , Igor Lubashev , Andi Kleen , Jin Yao , Stephane Eranian , James Clark , linux-kernel@vger.kernel.org Cc: Leo Yan Subject: [PATCH v2 2/4] perf arm_arch_timer: Convert between counter and timestamp Date: Fri, 7 Aug 2020 15:16:18 +0800 Message-Id: <20200807071620.11907-3-leo.yan@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200807071620.11907-1-leo.yan@linaro.org> References: <20200807071620.11907-1-leo.yan@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch introduces two new APIs, one is to calculate from converting counter to timestamp and provides a reverse flow to convert timestamp to counter. Signed-off-by: Leo Yan --- tools/perf/util/Build | 1 + tools/perf/util/arm_arch_timer.c | 28 ++++++++++++++++++++++++++++ tools/perf/util/arm_arch_timer.h | 3 +++ 3 files changed, 32 insertions(+) create mode 100644 tools/perf/util/arm_arch_timer.c diff --git a/tools/perf/util/Build b/tools/perf/util/Build index 8d18380ecd10..ba504549844f 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -101,6 +101,7 @@ perf-y += call-path.o perf-y += rwsem.o perf-y += thread-stack.o perf-y += spark.o +perf-y += arm_arch_timer.o perf-$(CONFIG_AUXTRACE) += auxtrace.o perf-$(CONFIG_AUXTRACE) += intel-pt-decoder/ perf-$(CONFIG_AUXTRACE) += intel-pt.o diff --git a/tools/perf/util/arm_arch_timer.c b/tools/perf/util/arm_arch_timer.c new file mode 100644 index 000000000000..c37ffa4d9710 --- /dev/null +++ b/tools/perf/util/arm_arch_timer.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include + +#include "arm_arch_timer.h" + +u64 perf_time_to_arch_timer_cyc(u64 ns, struct perf_arch_timer_conversion *tc) +{ + u64 t, quot, rem; + + t = ns - tc->time_zero; + quot = t / tc->time_mult; + rem = t % tc->time_mult; + return (quot << tc->time_shift) + + (rem << tc->time_shift) / tc->time_mult; +} + +u64 arch_timer_cyc_to_perf_time(u64 cyc, struct perf_arch_timer_conversion *tc) +{ + u64 quot, rem; + + cyc = tc->time_cycles + ((cyc - tc->time_cycles) & tc->time_mask); + + quot = cyc >> tc->time_shift; + rem = cyc & (((u64)1 << tc->time_shift) - 1); + return tc->time_zero + quot * tc->time_mult + + ((rem * tc->time_mult) >> tc->time_shift); +} diff --git a/tools/perf/util/arm_arch_timer.h b/tools/perf/util/arm_arch_timer.h index a3263cc4e5cf..7d9271f544f2 100644 --- a/tools/perf/util/arm_arch_timer.h +++ b/tools/perf/util/arm_arch_timer.h @@ -17,4 +17,7 @@ struct perf_event_mmap_page; int perf_read_arch_timer_conversion(const struct perf_event_mmap_page *pc, struct perf_arch_timer_conversion *tc); +u64 arch_timer_cyc_to_perf_time(u64 cyc, struct perf_arch_timer_conversion *tc); +u64 perf_time_to_arch_timer_cyc(u64 ns, struct perf_arch_timer_conversion *tc); + #endif // __PERF_ARM_ARCH_TIMER_H -- 2.17.1