linux-kernel - Re: [PATCH v4] PCI/AER: Fix aerdrv loading with "pcie

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Message-ID: <20180710231956.GD188359@bhelgaas-glaptop.roam.corp.google.com>
Date:   Tue, 10 Jul 2018 18:19:56 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Alexandru Gagniuc <mr.nuke.me@...il.com>
Cc:     bhelgaas@...gle.com, keith.busch@...el.com,
        alex_gagniuc@...lteam.com, austin_bolen@...l.com,
        shyam_iyer@...l.com, Frederick Lawler <fred@...dlawl.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oza Pawandeep <poza@...eaurora.org>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] PCI/AER: Fix aerdrv loading with "pcie_ports=native"
 parameter

On Tue, Jul 03, 2018 at 06:27:43PM -0500, Alexandru Gagniuc wrote:
> According to the documentation, "pcie_ports=native", linux should use
> native AER and DPC services. While that is true for the _OSC method
> parsing, this is not the only place that is checked. Should the HEST
> table list PCIe ports as firmware-first, linux will not use native
> services.
> 
> This happens because aer_acpi_firmware_first() doesn't take
> 'pcie_ports' into account. This is wrong. DPC uses the same logic when
> it decides whether to load or not, so fixing this also fixes DPC not
> loading.
> 
> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>

Applied to pci/aer for v4.19, thanks!

> ---
>  drivers/pci/pcie/aer.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index a2e88386af28..63a66a3b2fb5 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -303,6 +303,9 @@ int pcie_aer_get_firmware_first(struct pci_dev *dev)
>  	if (!pci_is_pcie(dev))
>  		return 0;
>  
> +	if (pcie_ports_native)
> +		return 0;
> +
>  	if (!dev->__aer_firmware_first_valid)
>  		aer_set_firmware_first(dev);
>  	return dev->__aer_firmware_first;
> @@ -323,6 +326,9 @@ bool aer_acpi_firmware_first(void)
>  		.firmware_first	= 0,
>  	};
>  
> +	if (pcie_ports_native)
> +		return 0;
> +
>  	if (!parsed) {
>  		apei_hest_parse(aer_hest_parse, &info);
>  		aer_firmware_first = info.firmware_first;
> -- 
> 2.14.3
>