linux-kernel - Re: [PATCH v3 3/3] cxl/pci: Replace host_bridge->native_aer with pcie_aer_is

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Message-ID: <20230804131454.00000622@Huawei.com>
Date:   Fri, 4 Aug 2023 13:14:54 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-cxl@...r.kernel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        <oohall@...il.com>, Lukas Wunner <lukas@...ner.de>,
        "Kuppuswamy Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Mahesh J Salgaonkar" <mahesh@...ux.ibm.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Ira Weiny" <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        "Dan Williams" <dan.j.williams@...el.com>,
        Yazen Ghannam <yazen.ghannam@....com>,
        Terry Bowman <terry.bowman@....com>,
        Robert Richter <rrichter@....com>
Subject: Re: [PATCH v3 3/3] cxl/pci: Replace host_bridge->native_aer with
 pcie_aer_is_native()

On Thu, 3 Aug 2023 23:01:29 +0000
Smita Koralahalli <Smita.KoralahalliChannabasappa@....com> wrote:

> Use pcie_aer_is_native() to determine the native AER ownership as the
> usage of host_bride->native_aer does not cover command line override of
> AER ownership.
> 
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> Reviewed-by: Robert Richter <rrichter@....com>
I hope there aren't systems getting this wrong but make sense to support
same override as for other cases.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
> v2:
> 	Replaced pcie_aer_is_native() at a later stage for automated
> 	backports.
> v3:
> 	Added more context to commit message.
> 	Added "Reviewed-by" tag.
> ---
>  drivers/cxl/pci.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index 2323169b6e5f..44a21ab7add5 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -529,7 +529,6 @@ static int cxl_pci_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
>  
>  static int cxl_pci_ras_unmask(struct pci_dev *pdev)
>  {
> -	struct pci_host_bridge *host_bridge = pci_find_host_bridge(pdev->bus);
>  	struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);
>  	void __iomem *addr;
>  	u32 orig_val, val, mask;
> @@ -542,7 +541,7 @@ static int cxl_pci_ras_unmask(struct pci_dev *pdev)
>  	}
>  
>  	/* BIOS has PCIe AER error control */
> -	if (!host_bridge->native_aer)
> +	if (!pcie_aer_is_native(pdev))
>  		return 0;
>  
>  	rc = pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &cap);