From: Bjorn Helgaas <bhelgaas@google.com>
To: Stephane Eranian <eranian@google.com>
Cc: Borislav Petkov <bp@alien8.de>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
"Zhang, Rui" <rui.zhang@intel.com>,
"Lu, Aaron" <aaron.lu@intel.com>,
lkml <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
Linux PCI <linux-pci@vger.kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Yinghai Lu <yinghai@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
"Yan, Zheng Z" <zheng.z.yan@intel.com>
Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
Date: Wed, 16 Apr 2014 17:11:28 -0600 [thread overview]
Message-ID: <CAErSpo4uHcnw2yXmqTjd9w8QDa2gCDpzuZDgWCoZFT3VAd3KCg@mail.gmail.com> (raw)
In-Reply-To: <CABPqkBRAYHghJjfcG3aJK4LUEmUmr2w_y8qLodfgALrxX+-Bgw@mail.gmail.com>
On Wed, Apr 16, 2014 at 5:08 PM, Stephane Eranian <eranian@google.com> wrote:
> On Wed, Apr 16, 2014 at 1:31 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
>> On Wed, Apr 16, 2014 at 09:04:04PM +0200, Borislav Petkov wrote:
>>> On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote:
>>> > Right. Even if we had this long-term solution, we'd still have
>>> > Stephane's current problem, because the PNP0C02 _CRS is still wrong.
>>> >
>>> > We do have a drivers/pnp/quirks.c where we could conceivably adjust
>>> > the PNP resource if we found the matching PCI device and MCHBAR. That
>>> > should solve Stephane's problem even with the current
>>> > drivers/pnp/system.c.
>>>
>>> Guys, this still triggers in -rc1. Do we have a fix or something
>>> testable at least?
>>
>> Hi Boris,
>>
>> Can you try the patch below?
>>
>>
>>
>> PNP: Work around Haswell BIOS defect in MCH area reporting
>>
>> From: Bjorn Helgaas <bhelgaas@google.com>
>>
>> Work around a Haswell BIOS defect that causes part of the MCH area to be
>> unreported.
>>
>> MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
>> PNP0C02 resource. The MCH space was 16KB prior to Haswell, but it is 32KB
>> in Haswell. Some Haswell BIOSes still report a PNP0C02 resource that is
>> only 16KB, which means the rest of the MCH space is consumed but
>> unreported.
>>
> Why are you saying this is Haswell vs. others. I see the problem on my
> IvyBridge laptop, like Boris.
Ah, good question. Somewhere I got pointed to the Haswell docs, which
say 32KB. I don't know what other parts have 32KB MCH spaces. If we
could figure out a list of device IDs with 32KB spaces, we could add
that to the quirk.
But I don't know how to come up with a complete list.
Bjorn
prev parent reply other threads:[~2014-04-16 23:11 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-24 16:24 Info: mapping multiple BARs. Your kernel is fine Borislav Petkov
2014-02-24 20:19 ` Borislav Petkov
2014-02-25 15:48 ` H. Peter Anvin
2014-02-25 16:14 ` Stephane Eranian
2014-02-25 16:30 ` Borislav Petkov
2014-02-25 16:33 ` Stephane Eranian
2014-02-25 17:39 ` Borislav Petkov
2014-02-25 18:54 ` Stephane Eranian
2014-02-25 22:10 ` Borislav Petkov
2014-02-26 6:56 ` Stephane Eranian
2014-02-26 9:29 ` Borislav Petkov
2014-02-26 9:47 ` Stephane Eranian
2014-02-26 9:59 ` Borislav Petkov
2014-02-27 10:12 ` Stephane Eranian
2014-02-27 10:27 ` Borislav Petkov
2014-02-27 22:12 ` Rafael J. Wysocki
2014-02-27 22:21 ` Borislav Petkov
2014-03-05 21:03 ` Stephane Eranian
2014-02-27 10:30 ` Peter Zijlstra
2014-02-27 10:32 ` Stephane Eranian
2014-02-27 11:08 ` Peter Zijlstra
2014-02-27 12:20 ` Stephane Eranian
2014-02-26 13:57 ` Rafael J. Wysocki
2014-02-26 13:50 ` Peter Zijlstra
2014-02-26 13:52 ` Borislav Petkov
2014-03-15 14:15 ` Rafael J. Wysocki
2014-03-16 11:55 ` Borislav Petkov
2014-03-16 13:08 ` Stephane Eranian
2014-03-17 0:09 ` Rafael J. Wysocki
2014-03-17 0:23 ` Rafael J. Wysocki
2014-03-20 2:24 ` Aaron Lu
2014-03-20 2:29 ` Stephane Eranian
2014-03-20 3:03 ` Zhang, Rui
2014-03-20 3:34 ` Stephane Eranian
2014-03-20 7:53 ` Zhang, Rui
2014-03-20 8:16 ` Yan, Zheng
2014-03-20 13:43 ` Zhang Rui
2014-03-20 16:03 ` Stephane Eranian
2014-03-20 13:35 ` Zhang Rui
2014-03-20 12:29 ` Rafael J. Wysocki
2014-03-20 16:45 ` Bjorn Helgaas
2014-03-20 20:55 ` Rafael J. Wysocki
2014-03-20 20:48 ` Bjorn Helgaas
2014-04-16 19:04 ` Borislav Petkov
2014-04-16 20:24 ` Zhang, Rui
2014-04-16 20:31 ` Bjorn Helgaas
2014-04-16 22:31 ` Dave Jones
2014-04-16 22:56 ` Bjorn Helgaas
2014-04-17 0:18 ` Dave Jones
2014-04-17 10:45 ` Borislav Petkov
2014-04-17 18:26 ` Bjorn Helgaas
2014-04-17 19:48 ` Borislav Petkov
2014-04-17 20:10 ` Bjorn Helgaas
2014-04-17 19:52 ` Dave Jones
2014-04-17 20:01 ` Borislav Petkov
2014-04-17 20:03 ` Dave Jones
2014-04-17 20:53 ` Dave Jones
2014-04-17 21:01 ` Borislav Petkov
[not found] ` <20140417213027.GA22412@redhat.com>
2014-04-18 10:38 ` Borislav Petkov
2014-04-16 23:08 ` Stephane Eranian
2014-04-16 23:11 ` Bjorn Helgaas [this message]
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