linux-kernel - Re: [PATCH V3 1/3] ACPI, PCI IRQ: add PCI

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Date:   Thu, 20 Oct 2016 20:01:51 -0700
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-acpi@...r.kernel.org, rjw@...ysocki.net, bhelgaas@...gle.com,
        ravikanth.nalla@....com, linux@...nbow-software.org,
        timur@...eaurora.org, cov@...eaurora.org, jcm@...hat.com,
        alex.williamson@...hat.com, linux-pci@...r.kernel.org,
        agross@...eaurora.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, wim@....tudelft.nl,
        linux-arm-kernel@...ts.infradead.org, Len Brown <lenb@...nel.org>
Subject: Re: [PATCH V3 1/3] ACPI, PCI IRQ: add PCI_USING penalty for ISA
 interrupts

On 10/20/2016 7:41 PM, Bjorn Helgaas wrote:
> On Thu, Oct 20, 2016 at 01:01:04PM -0700, Sinan Kaya wrote:
>> On 10/19/2016 3:44 PM, Bjorn Helgaas wrote:
> 
>>>   - Maintain a mapping of (IRQ, penalty).  Initially all penalties are
>>>     zero.  This is for *all* IRQs, not just ISA ones.  This could be a
>>>     linked list, but the structure is not important as long as we can
>>>     add things dynamically.
>>
>> Dynamic allocation doesn't work due to early calls from x86 architecture.
>> This is the reason why we iterate the link objects.
> 
> Where exactly is this early penalization?  That seems to be the
> biggest problem.  Well, maybe the question of ACPI core parsing of
> _CRS/_PRS is a bigger structural problem, but the dynamic allocation
> thing at least seems solvable.
> 

http://marc.info/?l=linux-acpi&m=145580159209240&w=2


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.