linux-kernel - Re: [PATCH 1/4] perf/dwc_pcie: Move common DWC struct definitions to 'pcie-dwc.h'

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Message-ID: <20250220072747.azfluj6mrkqy5osq@thinkpad>
Date: Thu, 20 Feb 2025 12:57:47 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Shradha Todi <shradha.t@...sung.com>
Cc: 'Shuai Xue' <xueshuai@...ux.alibaba.com>,
	'Jing Zhang' <renyu.zj@...ux.alibaba.com>,
	'Will Deacon' <will@...nel.org>,
	'Mark Rutland' <mark.rutland@....com>,
	'Jingoo Han' <jingoohan1@...il.com>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	'Lorenzo Pieralisi' <lpieralisi@...nel.org>,
	'Krzysztof Wilczyński' <kw@...ux.com>,
	'Rob Herring' <robh@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/4] perf/dwc_pcie: Move common DWC struct definitions to
 'pcie-dwc.h'

On Thu, Feb 20, 2025 at 11:31:49AM +0530, Shradha Todi wrote:
> 
> 
> > -----Original Message-----
> > From: Manivannan Sadhasivam via B4 Relay <devnull+manivannan.sadhasivam.linaro.org@...nel.org>
> > Sent: 18 February 2025 20:07
> > To: Shuai Xue <xueshuai@...ux.alibaba.com>; Jing Zhang <renyu.zj@...ux.alibaba.com>; Will Deacon <will@...nel.org>; Mark Rutland
> > <mark.rutland@....com>; Jingoo Han <jingoohan1@...il.com>; Bjorn Helgaas <bhelgaas@...gle.com>; Lorenzo Pieralisi
> > <lpieralisi@...nel.org>; Krzysztof Wilczyński <kw@...ux.com>; Rob Herring <robh@...nel.org>
> > Cc: Shradha Todi <shradha.t@...sung.com>; linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-perf-
> > users@...r.kernel.org; linux-pci@...r.kernel.org; linux-arm-msm@...r.kernel.org; Manivannan Sadhasivam
> > <manivannan.sadhasivam@...aro.org>
> > Subject: [PATCH 1/4] perf/dwc_pcie: Move common DWC struct definitions to 'pcie-dwc.h'
> > 
> > From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > 
> > Since these are common to all Desginware PCIe IPs, move them to a new header, 'pcie-dwc.h' so that other drivers could make use of
> > them.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  MAINTAINERS                 |  1 +
> >  drivers/perf/dwc_pcie_pmu.c | 23 ++---------------------
> >  include/linux/pcie-dwc.h    | 34 ++++++++++++++++++++++++++++++++++
> >  3 files changed, 37 insertions(+), 21 deletions(-)
> > 
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 896a307fa065..b4d09d52a750 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -18123,6 +18123,7 @@ S:	Maintained
> >  F:	Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
> >  F:	Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> >  F:	drivers/pci/controller/dwc/*designware*
> > +F:	include/linux/pcie-dwc.h
> > 
> >  PCI DRIVER FOR TI DRA7XX/J721E
> >  M:	Vignesh Raghavendra <vigneshr@...com>
> > diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c index cccecae9823f..05b37ea7cf16 100644
> > --- a/drivers/perf/dwc_pcie_pmu.c
> > +++ b/drivers/perf/dwc_pcie_pmu.c
> > @@ -13,6 +13,7 @@
> >  #include <linux/errno.h>
> >  #include <linux/kernel.h>
> >  #include <linux/list.h>
> > +#include <linux/pcie-dwc.h>
> >  #include <linux/perf_event.h>
> >  #include <linux/pci.h>
> >  #include <linux/platform_device.h>
> > @@ -99,26 +100,6 @@ struct dwc_pcie_dev_info {
> >  	struct list_head dev_node;
> >  };
> > 
> > -struct dwc_pcie_pmu_vsec_id {
> > -	u16 vendor_id;
> > -	u16 vsec_id;
> > -	u8 vsec_rev;
> > -};
> > -
> > -/*
> > - * VSEC IDs are allocated by the vendor, so a given ID may mean different
> > - * things to different vendors.  See PCIe r6.0, sec 7.9.5.2.
> > - */
> > -static const struct dwc_pcie_pmu_vsec_id dwc_pcie_pmu_vsec_ids[] = {
> > -	{ .vendor_id = PCI_VENDOR_ID_ALIBABA,
> > -	  .vsec_id = 0x02, .vsec_rev = 0x4 },
> > -	{ .vendor_id = PCI_VENDOR_ID_AMPERE,
> > -	  .vsec_id = 0x02, .vsec_rev = 0x4 },
> > -	{ .vendor_id = PCI_VENDOR_ID_QCOM,
> > -	  .vsec_id = 0x02, .vsec_rev = 0x4 },
> > -	{} /* terminator */
> > -};
> > -
> >  static ssize_t cpumask_show(struct device *dev,
> >  					 struct device_attribute *attr,
> >  					 char *buf)
> > @@ -529,7 +510,7 @@ static void dwc_pcie_unregister_pmu(void *data)
> > 
> >  static u16 dwc_pcie_des_cap(struct pci_dev *pdev)  {
> > -	const struct dwc_pcie_pmu_vsec_id *vid;
> > +	const struct dwc_pcie_vsec_id *vid;
> >  	u16 vsec;
> >  	u32 val;
> > 
> > diff --git a/include/linux/pcie-dwc.h b/include/linux/pcie-dwc.h new file mode 100644 index 000000000000..261ae11d75a4
> > --- /dev/null
> > +++ b/include/linux/pcie-dwc.h
> > @@ -0,0 +1,34 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2021-2023 Alibaba Inc.
> > + *
> > + * Copyright 2025 Linaro Ltd.
> > + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > + */
> > +
> > +#ifndef LINUX_PCIE_DWC_H
> > +#define LINUX_PCIE_DWC_H
> > +
> > +#include <linux/pci_ids.h>
> > +
> > +struct dwc_pcie_vsec_id {
> > +	u16 vendor_id;
> > +	u16 vsec_id;
> > +	u8 vsec_rev;
> > +};
> > +
> > +/*
> > + * VSEC IDs are allocated by the vendor, so a given ID may mean
> > +different
> > + * things to different vendors.  See PCIe r6.0, sec 7.9.5.2.
> > + */
> > +static const struct dwc_pcie_vsec_id dwc_pcie_pmu_vsec_ids[] = {
> 
> Rename this to dwc_pcie_rasdes_vsec_ids? pmu was perf file specific but technically the vsec is rasdes.
> 

Sure.

- Mani

-- 
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