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From: Keith Busch <keith.busch@intel.com>
To: Sinan Kaya <okaya@kernel.org>
Cc: Tyler Baicar <baicar.tyler@gmail.com>,
	mr.nuke.me@gmail.com, austin_bolen@dell.com,
	alex_gagniuc@dellteam.com, Shyam_Iyer@dell.com, lukas@wunner.de,
	bhelgaas@google.com, rjw@rjwysocki.net, lenb@kernel.org,
	ruscur@russell.cc, sbobroff@linux.ibm.com, oohall@gmail.com,
	linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 0/2] PCI/AER: Consistently use _OSC to determine who owns AER
Date: Mon, 19 Nov 2018 11:10:51 -0700	[thread overview]
Message-ID: <20181119181051.GA26707@localhost.localdomain> (raw)
In-Reply-To: <ef0a24e4-906e-f6df-c646-1fe47ea0dcc0@kernel.org>

On Mon, Nov 19, 2018 at 12:56:56PM -0500, Sinan Kaya wrote:
> On 11/19/2018 12:41 PM, Keith Busch wrote:
> > > Still, breaking existing systems that rely on HEST table is not cool.
> > > I'd rather have users specify "pcie_ports=native" to skip FF rather than
> > > having broken systems by default to be honest.
> > The pcie_ports=native work-around ignores FF to potentially unknown
> > results, though.
> > 
> 
> How about being able to enable/disable FF in BIOS?
>
> We can't really turn off firmware first in the kernel without asking help
> from the firmware.

The _OSC method this patch utilizes is the ACPI spec defined way for
the kernel to wrest control from firmware. BIOS specific menu settings
shouldn't be our only recourse when we have a spec authority defining
generic OS interfaces to accomplish the same thing.

Unless there is a disagreement on the _OSC interpreation, we'd have to
accept that platforms breaking from this patch are non-compliant.

> Like you said, it causes unpredictable results.
>
> There will be two competing software trying to touch the same registers.

  reply	other threads:[~2018-11-19 18:14 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 [this message]
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
2019-03-05 23:16 ` Bjorn Helgaas

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