Re: [PATCH v7 1/5] perf/dwc_pcie: Move common DWC struct definitions to 'pcie-dwc.h'

[Fan Ni <nifan.cxl@gmail.com>]

On Fri, Feb 21, 2025 at 06:45:44PM +0530, Shradha Todi wrote:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> 
> Since these are common to all Desginware PCIe IPs, move them to a new
> header 'pcie-dwc.h', so that other drivers like debugfs, perf and sysfs
> could make use of them.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> Signed-off-by: Shradha Todi <shradha.t@samsung.com>

Reviewed-by: Fan Ni <fan.ni@samsung.com>

> ---
>  MAINTAINERS                 |  1 +
>  drivers/perf/dwc_pcie_pmu.c | 25 +++----------------------
>  include/linux/pcie-dwc.h    | 34 ++++++++++++++++++++++++++++++++++
>  3 files changed, 38 insertions(+), 22 deletions(-)
>  create mode 100644 include/linux/pcie-dwc.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 3864d473f52f..6474a2d83de4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -18167,6 +18167,7 @@ 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@ti.com>
> diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c
> index cccecae9823f..da30f2c2d674 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)
> @@ -529,14 +510,14 @@ 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;
>  
>  	if (!pci_is_pcie(pdev) || !(pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT))
>  		return 0;
>  
> -	for (vid = dwc_pcie_pmu_vsec_ids; vid->vendor_id; vid++) {
> +	for (vid = dwc_pcie_rasdes_vsec_ids; vid->vendor_id; vid++) {
>  		vsec = pci_find_vsec_capability(pdev, vid->vendor_id,
>  						vid->vsec_id);
>  		if (vsec) {
> diff --git a/include/linux/pcie-dwc.h b/include/linux/pcie-dwc.h
> new file mode 100644
> index 000000000000..40f3545731c8
> --- /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@linaro.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_rasdes_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 */
> +};
> +
> +#endif /* LINUX_PCIE_DWC_H */
> -- 
> 2.17.1
>