linux-kernel - Re: [PATCH 2/3] perf/dwc_pcie: Load DesignWare PCIe PMU driver automatically on Ampere SoCs

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Message-ID: <50ad8d7c-6ce1-28d-987d-fa4e285f629c@os.amperecomputing.com>
Date: Wed, 9 Oct 2024 13:07:33 -0700 (PDT)
From: Ilkka Koskinen <ilkka@...amperecomputing.com>
To: Shuai Xue <xueshuai@...ux.alibaba.com>
cc: Ilkka Koskinen <ilkka@...amperecomputing.com>, 
    Jing Zhang <renyu.zj@...ux.alibaba.com>, Will Deacon <will@...nel.org>, 
    Mark Rutland <mark.rutland@....com>, linux-arm-kernel@...ts.infradead.org, 
    linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] perf/dwc_pcie: Load DesignWare PCIe PMU driver
 automatically on Ampere SoCs


Hi Shuai,

On Wed, 9 Oct 2024, Shuai Xue wrote:
> 在 2024/10/9 07:18, Ilkka Koskinen 写道:
>> Load DesignWare PCIe PMU driver automatically if the system has a PCI
>> bridge by Ampere.
>> 
>> Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
>> ---
>>   drivers/perf/dwc_pcie_pmu.c | 10 ++++++++++
>>   1 file changed, 10 insertions(+)
>> 
>> diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c
>> index 3581d916d851..d752168733cf 100644
>> --- a/drivers/perf/dwc_pcie_pmu.c
>> +++ b/drivers/perf/dwc_pcie_pmu.c
>> @@ -782,6 +782,16 @@ static void __exit dwc_pcie_pmu_exit(void)
>>   module_init(dwc_pcie_pmu_init);
>>   module_exit(dwc_pcie_pmu_exit);
>>   +static const struct pci_device_id dwc_pcie_pmu_table[] = {
>> +	{
>> +		PCI_DEVICE(PCI_VENDOR_ID_AMPERE, PCI_ANY_ID),
>
> Hi, Ilkka,
>
> Does all Ampere PCI bridge use this IP?

I have checked Altra, AltraMax and AmpereOne SoCs and they all do. 
Unfortunately, I don't have access to eMAG at this point. If the IP
will be changed and the feature won't be supported in the future SoCs,
I can certainly change the logic to accept only certain SoCs.

Cheers, Ilkka

>
> Best Regards,
> Shuai
>
>
>