linux-kernel - Re: [PATCH v3] PCI: vmd: Honor ACPI

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Date:   Tue,  4 Jan 2022 15:26:40 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     bhelgaas@...gle.com, Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Nirmal Patel <nirmal.patel@...ux.intel.com>,
        linux-pm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Wilczyński <kw@...ux.com>,
        Jonathan Derrick <jonathan.derrick@...ux.dev>
Subject: Re: [PATCH v3] PCI: vmd: Honor ACPI _OSC on PCIe features

On Fri, 3 Dec 2021 11:15:41 +0800, Kai-Heng Feng wrote:
> When Samsung PCIe Gen4 NVMe is connected to Intel ADL VMD, the
> combination causes AER message flood and drags the system performance
> down.
> 
> The issue doesn't happen when VMD mode is disabled in BIOS, since AER
> isn't enabled by acpi_pci_root_create() . When VMD mode is enabled, AER
> is enabled regardless of _OSC:
> [    0.410076] acpi PNP0A08:00: _OSC: platform does not support [AER]
> ...
> [    1.486704] pcieport 10000:e0:06.0: AER: enabled with IRQ 146
> 
> [...]

Applied to pci/vmd, thanks!

[1/1] PCI: vmd: Honor ACPI _OSC on PCIe features
      https://git.kernel.org/lpieralisi/pci/c/04b12ef163

Thanks,
Lorenzo