From: "Suzuki K. Poulose" <Suzuki.Poulose@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, arm@kernel.org,
punit.agrawal@arm.com, peterz@infradead.org
Subject: Re: [PATCH v5 07/11] arm-cci: Add routines to save/restore all counters
Date: Mon, 11 Jan 2016 10:58:45 +0000 [thread overview]
Message-ID: <56938AE5.9090702@arm.com> (raw)
In-Reply-To: <20160111105006.GF6499@leverpostej>
On 11/01/16 10:50, Mark Rutland wrote:
> On Mon, Jan 04, 2016 at 11:54:46AM +0000, Suzuki K. Poulose wrote:
>> Adds helper routines to disable the counter controls for
>> all the counters on the CCI PMU and restore it back, by
>> preserving the original state in caller provided mask.
>>
>> Cc: Punit Agrawal <punit.agrawal@arm.com>
>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
>> ---
>> drivers/bus/arm-cci.c | 38 ++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 38 insertions(+)
>>
>> diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
>> index a3938ef..2f1fcf0 100644
>> --- a/drivers/bus/arm-cci.c
>> +++ b/drivers/bus/arm-cci.c
>> @@ -672,6 +672,44 @@ static void pmu_set_event(struct cci_pmu *cci_pmu, int idx, unsigned long event)
>> }
>>
>> /*
>> + * For all counters on the CCI-PMU, disable any 'enabled' counters,
>> + * saving the changed counters in the mask, so that we can restore
>> + * it later using pmu_restore_counters. The mask is private to the
>> + * caller. We cannot rely on the used_mask maintained by the CCI_PMU
>> + * as it only tells us if the counter is assigned to perf_event or not.
>> + * The state of the perf_event cannot be locked by the PMU layer, hence
>> + * we check the individual counter status (which can be locked by
>> + * cci_pm->hw_events->pmu_lock).
>> + *
>> + * @mask should be initialised by the caller.
>
> We should probably state "initialised to zero", or "empty".
Yep, will fix it.
>> +/*
>> + * Restore the status of the counters. Reversal of the pmu_disable_counters().
>> + * For each counter set in the mask, enable the counter back.
>> + */
>
> Shouldn't that say pmu_save_counters?
Yea, missed it in rebase.
> With that:
>
> Acked-by: Mark Rutland <mark.rutland@arm.com>
>
Thanks
Suzuki
next prev parent reply other threads:[~2016-01-11 10:58 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-04 11:54 [PATCH v5 00/11] arm-cci: PMU updates Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 01/11] arm-cci: Define CCI counter period Suzuki K. Poulose
2016-01-04 18:27 ` Mark Rutland
2016-01-05 9:50 ` Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 02/11] arm-cci: Refactor pmu_write_counter Suzuki K. Poulose
2016-01-04 19:01 ` Mark Rutland
2016-01-04 11:54 ` [PATCH v5 03/11] arm-cci: Group writes to counter Suzuki K. Poulose
2016-01-04 19:03 ` Mark Rutland
2016-01-05 10:51 ` Suzuki K. Poulose
2016-01-11 10:44 ` Mark Rutland
2016-01-11 10:48 ` Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 04/11] arm-cci: Refactor CCI PMU enable/disable methods Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 05/11] arm-cci PMU: Delay counter writes to pmu_enable Suzuki K. Poulose
2016-01-04 19:24 ` Mark Rutland
2016-01-05 9:59 ` Suzuki K. Poulose
2016-01-11 10:46 ` Mark Rutland
2016-01-11 11:08 ` Suzuki K. Poulose
2016-01-11 11:24 ` Mark Rutland
2016-01-11 18:12 ` Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 06/11] arm-cci: Get the status of a counter Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 07/11] arm-cci: Add routines to save/restore all counters Suzuki K. Poulose
2016-01-11 10:50 ` Mark Rutland
2016-01-11 10:58 ` Suzuki K. Poulose [this message]
2016-01-04 11:54 ` [PATCH v5 08/11] arm-cci: Provide hook for writing to PMU counters Suzuki K. Poulose
2016-01-11 10:54 ` Mark Rutland
2016-01-11 12:14 ` Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 09/11] arm-cci: CCI-500: Work around PMU counter writes Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 10/11] arm-cci500: Rearrange PMU driver for code sharing with CCI-550 PMU Suzuki K. Poulose
2016-01-04 11:54 ` [PATCH v5 11/11] arm-cci: CoreLink CCI-550 PMU driver Suzuki K. Poulose
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