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From: David Laight <David.Laight@ACULAB.COM>
To: 'Alexandru Gagniuc' <mr.nuke.me@gmail.com>,
	"helgaas@google.com" <helgaas@google.com>
Cc: "alex_gagniuc@dellteam.com" <alex_gagniuc@dellteam.com>,
	Sam Bobroff <sbobroff@linux.ibm.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"Shyam_Iyer@Dell.com" <Shyam_Iyer@Dell.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"keith.busch@intel.com" <keith.busch@intel.com>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"lukas@wunner.de" <lukas@wunner.de>,
	Oliver O'Halloran <oohall@gmail.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"austin_bolen@dell.com" <austin_bolen@dell.com>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	Len Brown <lenb@kernel.org>
Subject: RE: [PATCH 0/2] PCI/AER: Consistently use _OSC to determine who owns AER
Date: Fri, 16 Nov 2018 12:37:00 +0000	[thread overview]
Message-ID: <ab363e80d45e4c3d91770c1b1010d1ce@AcuMS.aculab.com> (raw)
In-Reply-To: <20181115231605.24352-1-mr.nuke.me@gmail.com>

From: Alexandru Gagniuc
> Sent: 15 November 2018 23:16
...
> I've asked around a few people at Dell and they unanimously agree that
> _OSC is the correct way to determine ownership of AER.

This is all very well, but we have systems (they might be Dell ones)
where failure of a PCIe link (even when all the drivers are removed)
causes an NMI - and crashes the kernel.

There are other systems which have AER registers available for
some of the PCIe devices, but the BIOS ignores them and _OSC
doesn't let the kernel take control.
In this case the AER registers can contain useful information
after a read returns ~0u.
It would be useful to be able to get this information without
having to grovel through all the PCIe config space.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


  parent reply	other threads:[~2018-11-16 12:40 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-15 23:16 [PATCH 0/2] PCI/AER: Consistently use _OSC to determine who owns AER Alexandru Gagniuc
2018-11-15 23:16 ` [PATCH 1/2] PCI/AER: Do not use APEI/HEST to disable AER services globally Alexandru Gagniuc
2018-11-15 23:16 ` [PATCH 2/2] PCI/AER: Determine AER ownership based on _OSC instead of HEST Alexandru Gagniuc
2018-11-15 23:43   ` Keith Busch
2018-11-16  1:49 ` [PATCH 0/2] PCI/AER: Consistently use _OSC to determine who owns AER Sinan Kaya
2018-11-19 16:53   ` Tyler Baicar
2018-11-19 16:53     ` Keith Busch
2018-11-19 17:32       ` Sinan Kaya
2018-11-19 17:36         ` Keith Busch
2018-11-19 17:42         ` Sinan Kaya
2018-11-19 17:41           ` Keith Busch
2018-11-19 17:56             ` Sinan Kaya
2018-11-19 18:10               ` Keith Busch
2018-11-19 18:24                 ` Sinan Kaya
2018-11-19 19:11                   ` Alex G.
2018-11-19 19:32                     ` Sinan Kaya
2018-11-19 20:16                       ` Alex_Gagniuc
2018-11-19 20:33                         ` Sinan Kaya
2018-11-19 23:49                           ` Alex_Gagniuc
2018-11-20  1:54                             ` Sinan Kaya
2018-11-20 20:44                               ` Alex_Gagniuc
2018-11-20 21:02                                 ` Sinan Kaya
2018-11-20 21:42                                   ` Keith Busch
2018-11-20 22:28                                     ` Sinan Kaya
2018-11-20 22:35                                       ` Alex G.
2018-11-20 21:46                                   ` Alex_Gagniuc
2018-11-20 22:08                                     ` Sinan Kaya
2018-11-20 22:36                                       ` Alex_Gagniuc
2018-11-27 18:22                                       ` Alex_Gagniuc
2018-11-27 18:32                                         ` Sinan Kaya
2018-11-27 18:46                                           ` Tyler Baicar
2018-11-16 12:37 ` David Laight [this message]
2019-03-05 23:16 ` Bjorn Helgaas

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