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

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Date:   Thu, 26 May 2022 10:23:40 +0300
From:   Alexei Budankov <abudankov@...wei.com>
To:     "liuqi (BA)" <liuqi115@...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>,
        <abudankov@...wei.com>
Subject: Re: [PATCH v2] coresight: etm4x: Add Support for HiSilicon ETM device

Hi Qi,

On 26.05.2022 5:56, liuqi (BA) wrote:
> 
> 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 :)

Thanks for quick reply. Appreciate it much. :)

> 
> 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/

I will try it shortly and let you know.

> 
> 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?

Here we go:

huawei@...ubuntu:~$ pwd
/home/huawei
huawei@...ubuntu:~$ ls /sys/bus/amba/devices/
huawei@...ubuntu:~$ 

Look like our server firmware should be upgraded, right?
Your help and support is greatly appreciated.

Thanks,
Alexei

> 
> 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
>> .
> .