linux-kernel - Re: [PATCH V3 00/21] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI

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Date:	Thu, 14 Jan 2016 14:00:39 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Graeme Gregory <gg@...mlogic.co.uk>
Cc:	Tomasz Nowicki <tn@...ihalf.com>, linaro-acpi@...ts.linaro.org,
	linux-pci@...r.kernel.org, will.deacon@....com,
	okaya@...eaurora.org, wangyijing@...wei.com,
	Lorenzo.Pieralisi@....com, ddaney@...iumnetworks.com,
	linux-acpi@...r.kernel.org, robert.richter@...iumnetworks.com,
	jcm@...hat.com, arnd@...db.de, Stefano.Stabellini@...citrix.com,
	Liviu.Dudau@....com, msalter@...hat.com, bhelgaas@...gle.com,
	tglx@...utronix.de, mw@...ihalf.com,
	linux-arm-kernel@...ts.infradead.org, jchandra@...adcom.com,
	rjw@...ysocki.net, linux-kernel@...r.kernel.org,
	hanjun.guo@...aro.org, Suravee.Suthikulpanit@....com,
	jiang.liu@...ux.intel.com
Subject: Re: [PATCH V3 00/21] MMCONFIG refactoring and support for ARM64 PCI
 hostbridge init based on ACPI

On Thu, Jan 14, 2016 at 01:44:40PM +0000, Graeme Gregory wrote:
> On Wed, Jan 13, 2016 at 02:20:46PM +0100, Tomasz Nowicki wrote:
> > From the functionality point of view this series might be split into the
> > following logic parts:
> > 1. Make MMCONFIG code arch-agnostic which allows all architectures to collect
> >    PCI config regions and used when necessary.
> > 2. Move non-arch specific bits to the core code.
> > 3. Use MMCONFIG code and implement generic ACPI based PCI host controller driver.
> > 4. Enable above driver on ARM64
> > 
> > Patches has been built on top of 4.4 and can be found here:
> > git@...hub.com:semihalf-nowicki-tomasz/linux.git (pci-acpi-v3)
> > 
> > NOTE, this patch set depends on Matthew's patches:
> > http://www.spinics.net/lists/linux-pci/msg45950.html
> > https://github.com/Vality/linux/tree/pci-fixes
> > 
> > This has been tested on Cavium ThunderX server and QEMU.
> > Any help in reviewing and testing is very appreciated.
> 
> I have tested this on my AMD Overdrive so
> 
> Tested-by: Graeme Gregory <graeme.gregory@...aro.org>
> 
> But to actually get my r8169 network card working I also need the
> following patch.
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 2fbf840..40e24e2 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1717,7 +1717,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
>         set_dev_node(&dev->dev, pcibus_to_node(bus));
>         dev->dev.dma_mask = &dev->dma_mask;
>         dev->dev.dma_parms = &dev->dma_parms;
> -       dev->dev.coherent_dma_mask = 0xffffffffull;
> +       dev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
>         pci_dma_configure(dev);
> 
>         pci_set_dma_max_seg_size(dev, 65536);

With OF, we get the coherent_dma_mask set by of_dma_configure(). But I
have no idea how you do this with ACPI.

-- 
Catalin