linux-kernel - Re: [PATCH v11 02/16] PCI/RCEC: Add RCEC class code and extended capability

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Message-ID: <f90fcafa-3aea-758a-b3ef-636aeaf0ee4b@linux.intel.com>
Date:   Tue, 17 Nov 2020 12:07:30 -0800
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Sean V Kelley <sean.v.kelley@...el.com>, bhelgaas@...gle.com,
        Jonathan.Cameron@...wei.com, xerces.zhao@...il.com,
        rafael.j.wysocki@...el.com, ashok.raj@...el.com,
        tony.luck@...el.com, sathyanarayanan.kuppuswamy@...el.com,
        qiuxu.zhuo@...el.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 02/16] PCI/RCEC: Add RCEC class code and extended
 capability

Hi,

On 11/17/20 11:19 AM, Sean V Kelley wrote:
> From: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
> 
> A PCIe Root Complex Event Collector (RCEC) has base class 0x08, sub-class
> 0x07, and programming interface 0x00.  Add the class code 0x0807 to
> identify RCEC devices and add #defines for the RCEC Endpoint Association
> Extended Capability.
> 
> See PCIe r5.0, sec 1.3.4 ("Root Complex Event Collector") and sec 7.9.10
> ("Root Complex Event Collector Endpoint Association Extended Capability").
Why not merge this change with usage patch ? Keeping changes together will help
in case of reverting the code.
> 
> Link: https://lore.kernel.org/r/20201002184735.1229220-2-seanvk.dev@oregontracks.org
> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> ---
>   include/linux/pci_ids.h       | 1 +
>   include/uapi/linux/pci_regs.h | 7 +++++++
>   2 files changed, 8 insertions(+)
> 
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index 1ab1e24bcbce..d8156a5dbee8 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -81,6 +81,7 @@
>   #define PCI_CLASS_SYSTEM_RTC		0x0803
>   #define PCI_CLASS_SYSTEM_PCI_HOTPLUG	0x0804
>   #define PCI_CLASS_SYSTEM_SDHCI		0x0805
> +#define PCI_CLASS_SYSTEM_RCEC		0x0807
>   #define PCI_CLASS_SYSTEM_OTHER		0x0880
>   
>   #define PCI_BASE_CLASS_INPUT		0x09
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index a95d55f9f257..bccd3e35cb65 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -831,6 +831,13 @@
>   #define  PCI_PWR_CAP_BUDGET(x)	((x) & 1)	/* Included in system budget */
>   #define PCI_EXT_CAP_PWR_SIZEOF	16
>   
> +/* Root Complex Event Collector Endpoint Association  */
> +#define PCI_RCEC_RCIEP_BITMAP	4	/* Associated Bitmap for RCiEPs */
> +#define PCI_RCEC_BUSN		8	/* RCEC Associated Bus Numbers */
> +#define  PCI_RCEC_BUSN_REG_VER	0x02	/* Least version with BUSN present */
> +#define  PCI_RCEC_BUSN_NEXT(x)	(((x) >> 8) & 0xff)
> +#define  PCI_RCEC_BUSN_LAST(x)	(((x) >> 16) & 0xff)
> +
>   /* Vendor-Specific (VSEC, PCI_EXT_CAP_ID_VNDR) */
>   #define PCI_VNDR_HEADER		4	/* Vendor-Specific Header */
>   #define  PCI_VNDR_HEADER_ID(x)	((x) & 0xffff)
> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer