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 10:29:53 -0500
From:	Mark Salter <msalter@...hat.com>
To:	Tomasz Nowicki <tn@...ihalf.com>, bhelgaas@...gle.com,
	arnd@...db.de, will.deacon@....com, catalin.marinas@....com,
	rjw@...ysocki.net, hanjun.guo@...aro.org,
	Lorenzo.Pieralisi@....com, okaya@...eaurora.org,
	jiang.liu@...ux.intel.com, Stefano.Stabellini@...citrix.com
Cc:	robert.richter@...iumnetworks.com, mw@...ihalf.com,
	Liviu.Dudau@....com, ddaney@...iumnetworks.com, tglx@...utronix.de,
	wangyijing@...wei.com, Suravee.Suthikulpanit@....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, jchandra@...adcom.com, jcm@...hat.com
Subject: Re: [PATCH V3 00/21] MMCONFIG refactoring and support for ARM64 PCI
 hostbridge init based on ACPI

On Wed, 2016-01-13 at 14:20 +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.
> 
> v2 -> v3
> - fix legacy IRQ assigning and IO ports registration
> - remove reference to arch specific companion device for ia64
> - move ACPI PCI host controller driver to pci_root.c
> - drop generic domain assignment for x86 and ia64 as I am not
>   able to run all necessary test variants
> - drop patch which cleaned legacy IRQ assignment since it belongs to
>   Mathew's series:
>   https://patchwork.ozlabs.org/patch/557504/
> - extend MCFG quirk code
> - rebased to 4.4
> 
> v1 -> v2
> - moved non-arch specific piece of code to dirver/acpi/ directory
> - fixed IO resource handling
> - introduced PCI config accessors quirks matching
> - moved ACPI_COMPANION_SET to generic code

IO resources on Mustang get disabled unless I do:

@@ -126,9 +126,10 @@ static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
        if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
                res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
 
+#if 0
        if (res->end >= 0x10003)
                res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
-
+#endif

res->end is way beyond 0x10003 on Mustang:

  pci_bus 0000:00: root bus resource [io  0x0000-0xffff window] (bus address [0x10000000-0x1000ffff])