linux-kernel - Re: [PATCH V3 19/21] pci, acpi: Support for ACPI based generic PCI host controller init

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Date:	Mon, 18 Jan 2016 10:57:41 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	Hanjun Guo <hanjun.guo@...aro.org>, bhelgaas@...gle.com,
	arnd@...db.de, will.deacon@....com, catalin.marinas@....com,
	rjw@...ysocki.net, 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,
	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,
	jchandra@...adcom.com, jcm@...hat.com
Subject: Re: [PATCH V3 19/21] pci, acpi: Support for ACPI based generic PCI
 host controller init

On 15.01.2016 10:57, Hanjun Guo wrote:
> Hi Tomasz,
>
> On 2016/1/13 21:21, Tomasz Nowicki wrote:
>> Because of two patch series:
>> 1. Jiang Liu's common interface to support PCI host controller init
>> 2. MMCONFIG refactoring (part of this patch set)
>> now we can think about generic ACPI based PCI host controller init
>> implementation out of arch/ directory.
>>
>> These calls use information from MCFG table (PCI config space regions)
>> and _CRS method (IO/irq resources) to initialize PCI hostbridge.
>>
>> TBD: We are still not sure whether we should reassign resources
>> after PCI bus enumeration or trust firmware to do all that work for
>> us properly.
>>
>> Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>> CC: Arnd Bergmann <arnd@...db.de>
>> CC: Catalin Marinas <catalin.marinas@....com>
>> CC: Liviu Dudau <Liviu.Dudau@....com>
>> CC: Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>
>> CC: Will Deacon <will.deacon@....com>
>> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>> Tested-by: Jeremy Linton <jeremy.linton@....com>
>> ---
>>   drivers/acpi/Kconfig    |   5 ++
>>   drivers/acpi/pci_root.c | 131
>> ++++++++++++++++++++++++++++++++++++++++++++++++
>>   2 files changed, 136 insertions(+)
>>
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index c3664be..e315061 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -335,6 +335,11 @@ config ACPI_PCI_SLOT
>>         i.e., segment/bus/device/function tuples, with physical slots in
>>         the system.  If you are unsure, say N.
>>
>> +config ACPI_PCI_HOST_GENERIC
>> +    bool "Generic ACPI PCI host controller"
>> +    help
>> +      Say Y here if you want to support generic ACPI PCI host
>> controller.
>
> Since x86 and IA64 will not use ACPI_PCI_HOST_GENERIC in this
> patch, it should be defined as
>
> config ACPI_PCI_HOST_GENERIC
>      bool
>
> and select for ARCHs, or will default y on x86 and IA64 too.

Right, I will fix that in v4.

>
> Compiling the kernel on a IA64 machine, will send out the
> result when it's ready.
>

Thanks,
Tomasz