linux-kernel - Re: [PATCH v2] coresight: etm4x: Add Support for HiSilicon ETM device

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Message-ID: <5dd1bd83-232a-07e4-8fde-e4f6cd0e5b8c@huawei.com>
Date:   Thu, 26 May 2022 10:56:53 +0800
From:   "liuqi (BA)" <liuqi115@...wei.com>
To:     Alexei Budankov <abudankov@...wei.com>,
        Linuxarm <linuxarm@...wei.com>, <gregkh@...uxfoundation.org>,
        <mathieu.poirier@...aro.org>, <suzuki.poulose@....com>,
        <mike.leach@...aro.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Alexey Budankov <alexey.budankov@...wei.com>
Subject: Re: [PATCH v2] coresight: etm4x: Add Support for HiSilicon ETM device


Hi Alexei,

On 2022/5/25 23:10, Alexei Budankov wrote:
> 
> Hi Qi Liu,
> 
> On 13.08.2020 15:59, Qi Liu wrote:
>> Add ETMv4 periperhal ID for HiSilicon Hip08 and Hip09 platform. Hip08
>> contains ETMv4.2 device and Hip09 contains ETMv4.5 device.
>>
>> Signed-off-by: Qi Liu <liuqi115@...wei.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-etm4x.c | 2 ++
>>   1 file changed, 2 insertions(+)
> 
> Thanks for your patch.
> I would like to test HiSilicon ETM device feature on
> Kunpeng 920 based server.
> I applied the patch and booted the kernel with the changes.
> However I don't see any device files neither here:
> /sys/bus/coresight/devices/

Thanks for your test :)

Kunpeng 920 platform(Non-PG) support tracing CPU instruction, source 
device is coresight ETM, link device is coresight funnel and sink device 
is ultrasoc SMB. So you need to insmod coresight-* driver and SMB 
driver, which patch is :
Add support for UltraSoc System Memory Buffer
https://lore.kernel.org/linux-arm-kernel/20220416083953.52610-1-liuqi115@huawei.com/

by the way, can you help to check /sys/bus/amba/devices/, and make sure 
that the firmware of your board has supported ETM, funnel and SMB devices?

Thanks,
Qi

> nor here:
> /sys/bus/event_source/devices/cs_etm/sinks/
> What should a user expect new in os with this patch added?


> 
> Thanks,
> Alexei
> 


> 
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c 
>> b/drivers/hwtracing/coresight/coresight-etm4x.c
>> index 6d7d216..7797a57 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
>> @@ -1587,6 +1587,8 @@ static const struct amba_id etm4_ids[] = {
>>       CS_AMBA_UCI_ID(0x000bb805, uci_id_etm4),/* Qualcomm Kryo 4XX 
>> Cortex-A55 */
>>       CS_AMBA_UCI_ID(0x000bb804, uci_id_etm4),/* Qualcomm Kryo 4XX 
>> Cortex-A76 */
>>       CS_AMBA_UCI_ID(0x000cc0af, uci_id_etm4),/* Marvell ThunderX2 */
>> +    CS_AMBA_UCI_ID(0x000b6d01, uci_id_etm4),/* HiSilicon-Hip08 */
>> +    CS_AMBA_UCI_ID(0x000b6d02, uci_id_etm4),/* HiSilicon-Hip09 */
>>       {},
>>   };
>>
>> -- 
>> 2.8.1
> .