linuxppc-dev.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
From: "Alex G." <mr.nuke.me@gmail.com>
To: Sinan Kaya <okaya@kernel.org>, Keith Busch <keith.busch@intel.com>
Cc: Alex_Gagniuc@Dellteam.com, baicar.tyler@gmail.com,
	sbobroff@linux.ibm.com, linux-pci@vger.kernel.org,
	rjw@rjwysocki.net, linux-kernel@vger.kernel.org,
	Shyam.Iyer@dell.com, linux-acpi@vger.kernel.org, lukas@wunner.de,
	oohall@gmail.com, Austin.Bolen@dell.com, bhelgaas@google.com,
	linuxppc-dev@lists.ozlabs.org, lenb@kernel.org
Subject: Re: [PATCH 0/2] PCI/AER: Consistently use _OSC to determine who owns AER
Date: Tue, 20 Nov 2018 16:35:34 -0600	[thread overview]
Message-ID: <ea1048ed-7e9c-4ab5-4a05-01cbddae5c19@gmail.com> (raw)
In-Reply-To: <bace940c-70d9-6631-9818-43338d194327@kernel.org>



On 11/20/2018 04:28 PM, Sinan Kaya wrote:
> On 11/20/2018 4:42 PM, Keith Busch wrote:
>> How does that work? If the OS takes control, it sets up MSIs that FW 
>> don't
>> react to, and disables system errors through PCIe Root Control. Aren't
>> those sys errs the mechanism FW knows it has something to do, which
>> means the OS can effectively fence it off?
> 
> I think this is all implementation detail and doesn't necessarily apply
> to all firmware-first implementation flavors.
> 
> Assumptions are:
> 1. both FW and OS are listening to MSI interrupts

On hax86, I'm not sure FW can listen to MSI interrups. FW only exists in 
SMM, not ring 1-4.

> 2. FW monitors the system errors
> 
> Some FF implementation could route the AER interrupt to a higher privilege
> level. Some other implementation could use INTx or a side-band channel 
> interrupt
> for firmware-interrupt too.
> 
> I have seen all 3 except MSI :) and also firmware never monitored the 
> system
> error bits. I was curious if anybody ever used those legacy bits. Now, I 
> know
> someone is using it.

  reply	other threads:[~2018-11-20 22:38 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. [this message]
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ea1048ed-7e9c-4ab5-4a05-01cbddae5c19@gmail.com \
    --to=mr.nuke.me@gmail.com \
    --cc=Alex_Gagniuc@Dellteam.com \
    --cc=Austin.Bolen@dell.com \
    --cc=Shyam.Iyer@dell.com \
    --cc=baicar.tyler@gmail.com \
    --cc=bhelgaas@google.com \
    --cc=keith.busch@intel.com \
    --cc=lenb@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=lukas@wunner.de \
    --cc=okaya@kernel.org \
    --cc=oohall@gmail.com \
    --cc=rjw@rjwysocki.net \
    --cc=sbobroff@linux.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).