From: Yinghai Lu <yinghai@kernel.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>, Len Brown <lenb@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jesse Barnes <jesse.barnes@intel.com>,
Ricardo Jorge da Fonseca Marques Ferreira <storm@sys49152.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-acpi@vger.kernel.org,
Yannick Roehlly <yannick.roehlly@free.fr>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
x86@kernel.org
Subject: Re: [PATCH] pci: increase alignment to make more space for hidden code
Date: Mon, 12 Oct 2009 12:44:52 -0700 [thread overview]
Message-ID: <4AD38734.2040600@kernel.org> (raw)
In-Reply-To: <20091012192242.GA2691@elte.hu>
Ingo Molnar wrote:
> * Yinghai Lu <yinghai@kernel.org> wrote:
>
>>> This feels like a hack that accidentally covers up the problem. I
>>> don't think we understand what's happening well enough.
>> yes, we need to figure out why when acpi=on, those BAR are cleared,
>> before pci code try to scan and read BAR. (node early pic print out
>> untouched, but after APCI subsystem is enabled, those BAR got
>> clearred)
>
> I'm wondering, how did it get cleared - some AML script told the kernel
> to clear it?
[ 0.012392] ACPI: Core revision 20090521
...
[ 0.117217] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
[ 0.117223] ACPI: bus type pci registered
[ 0.117292] PCI: MCFG configuration 0: base e0000000 segment 0 buses 0 - 255
[ 0.117297] PCI: Not using MMCONFIG.
[ 0.117301] PCI: Using configuration type 1 for base access
[ 0.118064] bio: create slab <bio-0> at 0
[ 0.118995] ACPI: EC: Look up EC in DSDT
[ 0.125066] ACPI: BIOS _OSI(Linux) query ignored
[ 0.127077] ACPI: EC: non-query interrupt received, switching to interrupt mode
[ 0.632002] ACPI: EC: missing confirmations, switch off interrupt mode.
[ 0.793109] ACPI: Interpreter enabled
[ 0.793114] ACPI: (supports S0 S3 S4 S5)
[ 0.793139] ACPI: Using IOAPIC for interrupt routing
[ 0.793193] PCI: MCFG configuration 0: base e0000000 segment 0 buses 0 - 255
[ 0.795871] PCI: MCFG area at e0000000 reserved in ACPI motherboard resources
[ 0.806419] PCI: Using MMCONFIG at e0000000 - efffffff
[ 0.812767] ACPI: EC: GPE = 0x18, I/O: command/status = 0x66, data = 0x62
[ 0.812772] ACPI: EC: driver started in poll mode
[ 0.813206] ACPI: No dock devices found.
[ 0.813879] ACPI: PCI Root Bridge [PCI0] (0000:00)
could be ACPI EC AML code related.
because with pci=nommconf, the BARs still get cleared.
need the reporter to boot with acpi.debug_layer=0x400000 acpi.debug_level=
to get more info
YH
next prev parent reply other threads:[~2009-10-12 19:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-07 22:33 Regression in ACPI in 2.6.31-rc5 Ricardo Jorge da Fonseca Marques Ferreira
2009-08-13 3:53 ` Len Brown
2009-08-16 3:00 ` Ricardo Jorge da Fonseca Marques Ferreira
2009-10-06 3:17 ` Len Brown
2009-10-06 4:38 ` Yinghai Lu
[not found] ` <4ACAC8F1.1050706@kernel.org>
2009-10-11 21:17 ` [PATCH] pci: increase alignment to make more space for hidden code Yinghai Lu
2009-10-12 16:59 ` Bjorn Helgaas
2009-10-12 17:19 ` Ingo Molnar
2009-10-12 18:43 ` Yinghai Lu
2009-10-12 18:59 ` Yinghai Lu
2009-10-12 19:22 ` Ingo Molnar
2009-10-12 19:44 ` Yinghai Lu [this message]
2009-10-13 6:08 ` Bjorn Helgaas
2009-10-13 6:49 ` Ingo Molnar
2009-10-13 15:15 ` Bjorn Helgaas
2009-10-13 19:05 ` Ricardo Jorge da Fonseca Marques Ferreira
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