linux-kernel - Re: [RFC PATCH 0/4] ACPI based PCI host driver with generic ECAM

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Message-ID: <CAKc_7PWfP0eQJ8dRN=CLu37=GKxin32Uf5rjiZGZgQCbiab2iA@mail.gmail.com>
Date:	Fri, 18 Mar 2016 23:17:40 +0530
From:	Jayachandran C <jchandra@...adcom.com>
To:	Bjorn Helgaas <helgaas@...nel.org>,
	Tomasz Nowicki <tn@...ihalf.com>, rafael@...nel.org
Cc:	Jayachandran C <jchandra@...adcom.com>,
	Arnd Bergmann <arnd@...db.de>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	okaya@...eaurora.org, jiang.liu@...ux.intel.com,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	robert.richter@...iumnetworks.com, Marcin Wojtas <mw@...ihalf.com>,
	Liviu.Dudau@....com, David Daney <ddaney@...iumnetworks.com>,
	wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
	msalter@...hat.com, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	Jon Masters <jcm@...hat.com>
Subject: Re: [RFC PATCH 0/4] ACPI based PCI host driver with generic ECAM

On Fri, Mar 18, 2016 at 1:48 AM, Jayachandran C <jchandra@...adcom.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.