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 10:38:19 -0500
From:	Sinan Kaya <okaya@...eaurora.org>
To:	Mark Salter <msalter@...hat.com>, 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, 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 1/14/2016 10:29 AM, Mark Salter wrote:
On Wed, 2016-01-13 at 14:20 +0100, Tomasz Nowicki wrote:
> 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])
> 
> 

Join the club. I complained about this and I got the message that we just do what Intel does. 
See Arnd Bergmann's reply.

[PATCH V2 00/23] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI

1/12/2016 9:30 AM

It is an artificial limit coming from the x86 world introduced into common code.

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-- 
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project