All of lore.kernel.org
 help / color / mirror / Atom feed
From: Ingo Molnar <mingo@kernel.org>
To: Lukas Wunner <lukas@wunner.de>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	Bjorn Helgaas <bhelgaas@google.com>,
	Yinghai Lu <yinghai@kernel.org>,
	Matt Fleming <matt@codeblueprint.co.uk>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v2 3/3] x86/quirks: Add early quirk to reset Apple AirPort card
Date: Sun, 12 Jun 2016 13:49:02 +0200	[thread overview]
Message-ID: <20160612114902.GA15940@gmail.com> (raw)
In-Reply-To: <48d0972ac82a53d460e5fce77a07b2560db95203.1465690253.git.lukas@wunner.de>


* Lukas Wunner <lukas@wunner.de> wrote:

> The solution is to reset the card on boot by writing to a reset bit in
> its mmio space. This must be done as an early quirk and not as a plain
> vanilla PCI quirk to successfully combat memory corruption by DMAed
> packets: Matthew Garrett found out in 2012 that the packets are written
> to EfiBootServicesData memory (http://mjg59.dreamwidth.org/11235.html).
> This type of memory is made available to the page allocator by
> efi_free_boot_services(). [...]

Btw., would it also make sense to *not* free those pages by default, if firmware 
can occasionally corrupt them? What memory size are we talking about?

Thanks,

	Ingo

  reply	other threads:[~2016-06-12 11:49 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-12 10:31 [PATCH v2 0/3] Reset Apple AirPort card Lukas Wunner
2016-06-12 10:31 ` [PATCH v2 3/3] x86/quirks: Add early quirk to reset " Lukas Wunner
2016-06-12 11:49   ` Ingo Molnar [this message]
2016-06-12 12:37     ` Lukas Wunner
2016-06-13 14:44       ` Matt Fleming
2016-06-14  7:36         ` Ingo Molnar
2016-06-28 13:21     ` Lukas Wunner
2016-07-10 19:01   ` [tip:x86/urgent] " tip-bot for Lukas Wunner
2016-06-12 10:31 ` [PATCH v2 2/3] x86/quirks: Reintroduce scanning of secondary buses Lukas Wunner
2016-07-10 19:01   ` [tip:x86/urgent] " tip-bot for Lukas Wunner
2016-06-12 10:31 ` [PATCH v2 1/3] x86/quirks: Apply nvidia_bugs quirk only on root bus Lukas Wunner
2016-07-10 19:00   ` [tip:x86/urgent] " tip-bot for Lukas Wunner

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=20160612114902.GA15940@gmail.com \
    --to=mingo@kernel.org \
    --cc=akpm@linux-foundation.org \
    --cc=bhelgaas@google.com \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lukas@wunner.de \
    --cc=matt@codeblueprint.co.uk \
    --cc=tglx@linutronix.de \
    --cc=torvalds@linux-foundation.org \
    --cc=x86@kernel.org \
    --cc=yinghai@kernel.org \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.