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Subject: Re: [PATCH 00/10] PCI/ATS: Device-tree support and other improvements
To:     Jean-Philippe Brucker <jean-philippe@linaro.org>,
        <bhelgaas@google.com>, <will@kernel.org>, <robh+dt@kernel.org>,
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References: <20200213165049.508908-1-jean-philippe@linaro.org>
From:   Hanjun Guo <guohanjun@huawei.com>
Message-ID: <b898317c-c534-aad8-5b0d-45723e0b8e89@huawei.com>
Date:   Fri, 6 Mar 2020 17:32:57 +0800
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On 2020/2/14 0:50, Jean-Philippe Brucker wrote:
> Enable ATS on device-tree based systems, and factor the common ATS
> enablement checks into pci_enable_ats().
> 
> ATS support in PCIe endpoints is discovered through the ATS capability,
> but there is no common method for discovering whether the host bridge
> supports ATS. Each vendor provides their own ACPI method:
> * DMAR (Intel) reports ATS support per domain or per root port.
> * IVRS (AMD) reports negative ATS support for a range of devices.
> * IORT (ARM) reports ATS support for a root complex.

Tested this patch set against 5.6-rc2 on a Kunpeng920 ARM server,
I just confirmed that this patch set didn't break anything in
my box with ACPI booting, PCI devices work as expected, FWIW,

Tested-by: Hanjun Guo <guohanjun@huawei.com>

Thanks
Hanjun