From: Suzuki.Poulose@arm•com (Suzuki K Poulose)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH V3 12/18] coresight: tmc: dump system memory content only when needed
Date: Mon, 25 Apr 2016 15:49:04 +0100 [thread overview]
Message-ID: <571E2E60.50207@arm.com> (raw)
In-Reply-To: <CANLsYky_TK9PkwSPnQzmaV5Y0fD0jQvRS2FgTB9b6Om8TDfWXQ@mail.gmail.com>
On 25/04/16 15:38, Mathieu Poirier wrote:
> On 25 April 2016 at 05:16, Suzuki K Poulose <Suzuki.Poulose@arm•com> wrote:
>> On 22/04/16 18:14, Mathieu Poirier wrote:
>>>
>>> Calling tmc_etf/etr_dump_hw() is required only when operating from
>>> sysFS. When working from Perf, the system memory is harvested
>>> from the AUX trace API.
>>>
>>> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro•org>
>>> ---
>>> drivers/hwtracing/coresight/coresight-tmc-etf.c | 7 ++++++-
>>> drivers/hwtracing/coresight/coresight-tmc-etr.c | 7 ++++++-
>>> 2 files changed, 12 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c
>>> b/drivers/hwtracing/coresight/coresight-tmc-etf.c
>>> index d090a9745c73..25fad93b68d4 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
>>> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
>>> @@ -74,7 +74,12 @@ static void tmc_etb_disable_hw(struct tmc_drvdata
>>> *drvdata)
>>> CS_UNLOCK(drvdata->base);
>>>
>>> tmc_flush_and_stop(drvdata);
>>> - tmc_etb_dump_hw(drvdata);
>>> + /*
>>> + * When operating in sysFS mode the content of the buffer needs to
>>> be
>>> + * read before the TMC is disabled.
>>> + */
>>> + if (local_read(&drvdata->mode) == CS_MODE_SYSFS)
>>> + tmc_etb_dump_hw(drvdata);
>>> tmc_disable_hw(drvdata);
>>>
>>> CS_LOCK(drvdata->base);
>>> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c
>>> b/drivers/hwtracing/coresight/coresight-tmc-etr.c
>>> index 8bbbf3ab1387..4b000f4003a2 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
>>> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
>>> @@ -76,7 +76,12 @@ static void tmc_etr_disable_hw(struct tmc_drvdata
>>> *drvdata)
>>> CS_UNLOCK(drvdata->base);
>>>
>>> tmc_flush_and_stop(drvdata);
>>> - tmc_etr_dump_hw(drvdata);
>>> + /*
>>> + * When operating in sysFS mode the content of the buffer needs to
>>> be
>>> + * read before the TMC is disabled.
>>> + */
>>> + if (local_read(&drvdata->mode) == CS_MODE_SYSFS)
>>> + tmc_etr_dump_hw(drvdata);
>>> tmc_disable_hw(drvdata);
>>
>>
>> Nit: It would be cleaner if tmc_etX_disable_hw accepted a bool parameter to
>> decide
>> whether to dump the hw data or not. That way, the callers can make the
>> decision,
>> leaving the disable_hw code unaware of the mode checks.
>
> My goal in pushing the functionality to tmc_etX_disable_hw() was to
> especially keep the the higher layers unaware of sink buffer
> management specifics. There is two ways to look at this and we simply
> landed on different sides of the fence. I'm not strongly opinionated
> on this, I'll modify if you're really keen on this.
I am not, you can retain as it is.
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm•com>
Suzuki
next prev parent reply other threads:[~2016-04-25 14:49 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-22 17:13 [PATCH V3 00/18] coresight: tmc: make driver usable by Perf Mathieu Poirier
2016-04-22 17:13 ` [PATCH V3 01/18] coresight: tmc: modifying naming convention Mathieu Poirier
2016-04-22 17:13 ` [PATCH V3 02/18] coresight: tmc: waiting for TMCReady bit before programming Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 03/18] coresight: tmc: re-implementing tmc_read_prepare/unprepare() functions Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 04/18] coresight: tmc: clearly define number of transfers per burst Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 05/18] coresight: tmc: introducing new header file Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 06/18] coresight: tmc: cleaning up " Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 07/18] coresight: tmc: splitting driver in ETB/ETF and ETR components Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 08/18] coresight: tmc: making prepare/unprepare functions generic Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 09/18] coresight: tmc: allocating memory when needed Mathieu Poirier
2016-04-25 10:20 ` Suzuki K Poulose
2016-04-25 14:24 ` Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 10/18] coresight: tmc: getting the right read_count on tmc_open() Mathieu Poirier
2016-04-25 10:47 ` Suzuki K Poulose
2016-04-25 14:25 ` Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 11/18] coresight: tmc: adding mode of operation for link/sinks Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 12/18] coresight: tmc: dump system memory content only when needed Mathieu Poirier
2016-04-25 11:16 ` Suzuki K Poulose
2016-04-25 14:38 ` Mathieu Poirier
2016-04-25 14:49 ` Suzuki K Poulose [this message]
2016-04-22 17:14 ` [PATCH V3 13/18] coresight: tmc: make sysFS and Perf mode mutually exclusive Mathieu Poirier
2016-04-25 14:32 ` Suzuki K Poulose
2016-04-25 14:48 ` Mathieu Poirier
2016-04-25 14:52 ` Suzuki K Poulose
2016-04-25 15:05 ` Mathieu Poirier
2016-04-25 15:11 ` Suzuki K Poulose
2016-04-25 15:18 ` Mathieu Poirier
2016-04-26 9:23 ` Suzuki K Poulose
2016-04-22 17:14 ` [PATCH V3 14/18] coresight: tmc: keep track of memory width Mathieu Poirier
2016-04-25 14:41 ` Suzuki K Poulose
2016-04-25 14:55 ` Mathieu Poirier
2016-04-25 15:09 ` Suzuki K Poulose
2016-04-25 15:25 ` Mathieu Poirier
2016-04-25 15:28 ` Suzuki K Poulose
2016-04-22 17:14 ` [PATCH V3 15/18] coresight: moving struct cs_buffers to header file Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 16/18] coresight: tmc: implementing TMC-ETF AUX space API Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 17/18] coresight: tmc: implementing TMC-ETR " Mathieu Poirier
2016-04-22 17:14 ` [PATCH V3 18/18] coresight: configuring ETF in FIFO mode when acting as link Mathieu Poirier
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