linux-kernel - Re: [PATCH v4 3/4] drivers/perf: add DesignWare PCIe PMU driver

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Date:   Wed, 17 May 2023 10:35:27 +0800
From:   Shuai Xue <xueshuai@...ux.alibaba.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     yangyicong@...wei.com, will@...nel.org,
        Jonathan.Cameron@...wei.com, baolin.wang@...ux.alibaba.com,
        robin.murphy@....com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        rdunlap@...radead.org, mark.rutland@....com,
        zhuo.song@...ux.alibaba.com
Subject: Re: [PATCH v4 3/4] drivers/perf: add DesignWare PCIe PMU driver



On 2023/5/17 03:19, Bjorn Helgaas wrote:
> On Tue, May 16, 2023 at 09:01:09PM +0800, Shuai Xue wrote:
>> ...
> 
>> +#include <linux/pci.h>
>> +#include <linux/bitfield.h>
>> +#include <linux/bitops.h>
>> +#include <linux/cpuhotplug.h>
>> +#include <linux/cpumask.h>
>> +#include <linux/device.h>
>> +#include <linux/errno.h>
>> +#include <linux/kernel.h>
>> +#include <linux/list.h>
>> +#include <linux/perf_event.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/smp.h>
>> +#include <linux/sysfs.h>
>> +#include <linux/types.h>
> 
> Typically in alpha order.

Got it, I will reorder them.

> 
>> +#define DWC_PCIE_VSEC_RAS_DES_ID		0x02
>> +
>> +#define DWC_PCIE_EVENT_CNT_CTL			0x8
> 
> Add a blank line here.

Sure, will add it.

> 
>> +/*
>> + * Event Counter Data Select includes two parts:
> 
>> +#define DWC_PCIE_EVENT_CNT_DATA			0xC
>> +#define DWC_PCIE_DURATION_4US			0xff
> ...
> Pick upper-case hex or lower-case hex and use consistently.

Will pick upper-case hex for all macros.

> 
>> +#define DWC_PCIE_LANE_EVENT_MAX_PERIOD		(GENMASK_ULL(31, 0))
>> +#define DWC_PCIE_TIME_BASED_EVENT_MAX_PERIOD	(GENMASK_ULL(63, 0))
> 
> Unnecessary outer "()".

Ok, will remove it.

> 
>> +struct dwc_pcie_pmu {
>> +	struct pci_dev		*pdev;		/* Root Port device */
>> +	u32			ras_des;	/* RAS DES capability offset */
> 
> u16 is enough to address all of config space.

Go it. will fix in next version.

Thank you :)

Best Regards,
Shuai