linux-kernel - Re: Add Dell Studio 1557 to pci=nocrs blacklist

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Message-ID: <CAErSpo7tvCz4Bi6TF2Khi9aY7wHyWL9Fu2dSD5v8zuOLYmL6oA@mail.gmail.com>
Date:	Wed, 11 Jan 2012 09:07:55 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Dave Jones <davej@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>, x86@...nel.org,
	linux-pci@...r.kernel.org
Subject: Re: Add Dell Studio 1557 to pci=nocrs blacklist

On Wed, Jan 4, 2012 at 11:37 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Dave Jones <davej@...hat.com> wrote:
>
>> The Dell Studio 1557 also doesn't suspend correctly when CRS is enabled.
>> Details at https://bugzilla.redhat.com/show_bug.cgi?id=769657
>>
>> Reported-by: Gregory S. Hoerner <ghoerner@...nscendingthought.com>
>> Signed-off-by: Dave Jones <davej@...hat.com>
>>
>> --- linux-3.1.noarch/arch/x86/pci/acpi.c~     2012-01-04 11:19:36.783664477 -0500
>> +++ linux-3.1.noarch/arch/x86/pci/acpi.c      2012-01-04 11:23:42.403666272 -0500
>> @@ -75,6 +75,16 @@ static const struct dmi_system_id pci_us
>>       /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
>>       {
>>               .callback = set_nouse_crs,
>> +             .ident = "Dell Studio 1557",
>> +             .matches = {
>> +                     DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
>> +                     DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557");
>> +                     DMI_MATCH(DMI_BIOS_VERSION, "A09"),
>
> Btw., should we perhaps match on all things 'Studio*'? For these
> two systems i'm sure there's 20 other models we have not covered
> yet ...

+linux-pci

I think we should hold off on merging this patch upstream.  We don't
understand the root cause yet, and I haven't seen any evidence that
setting "pci=nocrs" actually makes a difference in PCI resource
allocation (https://bugzilla.redhat.com/show_bug.cgi?id=769657#c27)

Bjorn
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