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From: Jayachandran C <jchandra@broadcom.com>
Date: Fri, 18 Mar 2016 23:17:40 +0530
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Subject: Re: [RFC PATCH 0/4] ACPI based PCI host driver with generic ECAM
To: Bjorn Helgaas <helgaas@kernel.org>, Tomasz Nowicki <tn@semihalf.com>,
        rafael@kernel.org
Cc: Jayachandran C <jchandra@broadcom.com>, Arnd Bergmann <arnd@arndb.de>,
        Will Deacon <will.deacon@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Hanjun Guo <hanjun.guo@linaro.org>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>, okaya@codeaurora.org,
        jiang.liu@linux.intel.com,
        Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
        robert.richter@caviumnetworks.com, Marcin Wojtas <mw@semihalf.com>,
        Liviu.Dudau@arm.com, David Daney <ddaney@caviumnetworks.com>,
        wangyijing@huawei.com, Suravee.Suthikulpanit@amd.com,
        msalter@redhat.com, linux-pci@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org,
        linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org,
        Jon Masters <jcm@redhat.com>
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On Fri, Mar 18, 2016 at 1:48 AM, Jayachandran C <jchandra@broadcom.com> wrote:
> Hi Bjorn,
>
> Here is a new patchset for the ACPI PCI controller driver based on the
> earlier discussion[1].
>
> The first two patches in the patchset implements pci/ecam.c for generic
> config space access and uses it in pci-host-generic.c and related files.
>
> The third patch implements the ACPI PCI host driver using the same ecam
> access functions. The fourth patch adds the implementation of raw
> operations.
>
> I have not used the pci_mmcfg_list or the region definitions from x86,
> but have used a much simpler approach here.
>
> This should apply cleanly on top of the current pci next tree, and
> can be reviewed as a patchset.  To use it on ARM64, we need to pull
> in about 7 patches more from Tomasz patchset that fixes various
> issues (like stub code in arm64 pci.c, ACPI companion setup,
> domain number assignment, IO resources fixup etc.).
>
> If you are okay with this approach, I will work with Tomasz and
> post the full patchset.
>
> This has been tested on qemu with OVMF for the ACPI part and with
> device tree for pci-host-generic code.

The full patchset is available at https://github.com/jchandra-brcm/linux.git on
branch arm64-acpi-pci, if anyone wants to try it.

Comments, suggestions and testing would be welcome.

Thanks,
JC.