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Date: Mon, 2 Mar 2015 11:29:14 +0000 From: "Suzuki K. Poulose" <suzuki.poulose@....com> To: linux-arm-kernel@...ts.infradead.org Cc: nico@...aro.org, b.zolnierkie@...sung.com, kgene@...nel.org, a.kesavan@...sung.com, arnd@...db.de, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, Liviu.Dudau@....com, Lorenzo.Pieralisi@....com, Pawel.Moll@....com, olof@...om.net, Sudeep.Holla@....com, Punit.Agrawal@....com, Will.Deacon@....com, Catalin.Marinas@....com, "Suzuki K. Poulose" <suzuki.poulose@....com> Subject: [PATCH 5/5] arm-cci: Fix CCI PMU event validation From: "Suzuki K. Poulose" <suzuki.poulose@....com> We mask the event with the CCI_PMU_EVENT_MASK, before passing the config to pmu_validate_hw_event(), which causes extra bits to be ignored and qualifies an invalid event code as valid. e.g, $ perf stat -a -C 0 -e CCI_400/config=0x1ff,name=cycles/ sleep 1 Performance counter stats for 'system wide': 506951142 cycles 1.013879626 seconds time elapsed where, cycles has an event coding of 0xff. This patch also removes the unnecessary 'event' mask in pmu_write_register, since the config_base is set by the pmu code after the event is validated. Helps in killing CCI_PMU_EVENT_MASK from common code. Signed-off-by: Suzuki K. Poulose <suzuki.poulose@....com> --- drivers/bus/arm-cci.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c index f86f096..438a121 100644 --- a/drivers/bus/arm-cci.c +++ b/drivers/bus/arm-cci.c @@ -191,11 +191,14 @@ static int pmu_is_valid_master_event(u8 ev_code) ev_code <= pmu->model->event_ranges[CCI_IF_MASTER].max; } -static int pmu_validate_hw_event(u8 hw_event) +static int pmu_validate_hw_event(u32 hw_event) { u8 ev_source = CCI_PMU_EVENT_SOURCE(hw_event); u8 ev_code = CCI_PMU_EVENT_CODE(hw_event); + if (hw_event & ~CCI_PMU_EVENT_MASK) + return -ENOENT; + switch (ev_source) { case CCI_PORT_S0: case CCI_PORT_S1: @@ -265,7 +268,6 @@ static void pmu_enable_counter(int idx) static void pmu_set_event(int idx, unsigned long event) { - event &= CCI_PMU_EVENT_MASK; pmu_write_register(event, idx, CCI_PMU_EVT_SEL); } @@ -282,7 +284,7 @@ static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *ev { struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu); struct hw_perf_event *hw_event = &event->hw; - unsigned long cci_event = hw_event->config_base & CCI_PMU_EVENT_MASK; + unsigned long cci_event = hw_event->config_base; int idx; if (cci_event == CCI_PMU_CYCLES) { @@ -303,7 +305,7 @@ static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *ev static int pmu_map_event(struct perf_event *event) { int mapping; - u8 config = event->attr.config & CCI_PMU_EVENT_MASK; + u32 config = event->attr.config; if (event->attr.type < PERF_TYPE_MAX) return -ENOENT; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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