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Message-ID: <92b6f01c-52ca-92a8-20ea-450e23f4a10e@linux.alibaba.com>
Date:   Sun, 17 Jul 2022 21:02:12 +0800
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From:   Shuai Xue <xueshuai@linux.alibaba.com>
Subject: Re: [RESEND PATCH v2 2/3] drivers/perf: add DDR Sub-System Driveway
 PMU driver for Yitian 710 SoC
To:     Randy Dunlap <rdunlap@infradead.org>, Jonathan.Cameron@Huawei.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        will@kernel.org, mark.rutland@arm.com
Cc:     baolin.wang@linux.alibaba.com, yaohongbo@linux.alibaba.com,
        nengchen@linux.alibaba.com, zhuo.song@linux.alibaba.com
References: <20220617111825.92911-1-xueshuai@linux.alibaba.com>
 <20220715151310.90091-3-xueshuai@linux.alibaba.com>
 <9da48b8e-adbb-9223-5687-549c66526c47@infradead.org>
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Hi, Randy,

Thank you for your quick reply.

在 2022/7/16 AM3:05, Randy Dunlap 写道:
> Hi--
>
> On 7/15/22 08:13, Shuai Xue wrote:
>> Add the DDR Sub-System Driveway Performance Monitoring Unit (PMU) driver
>> support for Alibaba T-Head Yitian 710 SoC chip. Yitian supports DDR5/4
>> DRAM and targets cloud computing and HPC.
>>
>> Each PMU is registered as a device in /sys/bus/event_source/devices, and
>> users can select event to monitor in each sub-channel, independently. For
>> example, ali_drw_21000 and ali_drw_21080 are two PMU devices for two
>> sub-channels of the same channel in die 0. And the PMU device of die 1 is
>> prefixed with ali_drw_400XXXXX, e.g. ali_drw_40021000.
>>
>> Due to hardware limitation, one of DDRSS Driveway PMU overflow interrupt
>> shares the same irq number with MPAM ERR_IRQ. To register DDRSS PMU and
>> MPAM drivers successfully, add IRQF_SHARED flag.
>>
>> Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
>> Co-developed-by: Hongbo Yao <yaohongbo@linux.alibaba.com>
>> Signed-off-by: Hongbo Yao <yaohongbo@linux.alibaba.com>
>> Co-developed-by: Neng Chen <nengchen@linux.alibaba.com>
>> Signed-off-by: Neng Chen <nengchen@linux.alibaba.com>
>> ---
>>  drivers/perf/Kconfig                  |   8 +
>>  drivers/perf/Makefile                 |   1 +
>>  drivers/perf/alibaba_uncore_drw_pmu.c | 793 ++++++++++++++++++++++++++
>>  3 files changed, 802 insertions(+)
>>  create mode 100644 drivers/perf/alibaba_uncore_drw_pmu.c
>>
>> diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
>> index 1e2d69453771..dfafba4cb066 100644
>> --- a/drivers/perf/Kconfig
>> +++ b/drivers/perf/Kconfig
>> @@ -183,6 +183,14 @@ config APPLE_M1_CPU_PMU
>>  	  Provides support for the non-architectural CPU PMUs present on
>>  	  the Apple M1 SoCs and derivatives.
>>  
>> +config ALIBABA_UNCORE_DRW_PMU
>> +	tristate "Alibaba T-Head Yitian 710 DDR Sub-system Driveway PMU driver"
>> +	depends on (ARM64 && ACPI)
>> +	default m
> 
> Why should this driver be automatically built?
> I.e., why is the "default m" here at all?

Sorry, we automatically build this driver internally. I forgot to delete it.
I will delete "default m" in next version.

Best regards,
Shuai

> 
> Thanks.
> 
>> +	help
>> +	  Support for Driveway PMU events monitoring on Yitian 710 DDR
>> +	  Sub-system.
> 
>