linux-kernel - Re: [PATCH 1/5] Update Documentation/pci.txt

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Message-ID: <458C5389.70704@s5r6.in-berlin.de>
Date:	Fri, 22 Dec 2006 22:52:09 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Grant Grundler <grundler@...isc-linux.org>
CC:	Randy Dunlap <randy.dunlap@...cle.com>, Greg KH <greg@...ah.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-pci@...ey.karlin.mff.cuni.cz, Andrew Morton <akpm@...l.org>,
	e1000-devel@...ts.sourceforge.net, linux-scsi@...r.kernel.org,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Subject: Re: [PATCH 1/5] Update Documentation/pci.txt

> On Mon, 18 Dec 2006 00:11:33 -0700 Grant Grundler wrote:
...
>> +4.1 Stop IRQs on the device
>> +~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> +How to do this is chip/device specific. If it's not done, it opens
>> +the possibility of a "screaming interrupt" if (and only if)
>> +the IRQ is shared with another device.
>> +
>> +When the shared IRQ handler is "unhoooked", the remaining devices
                                       ^^^
-> unhooked

...
>> +11. MMIO Space and "Write Posting"
>> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> +Converting a driver from using I/O Port space to using MMIO space
>> +often requires some additional changes. Specifically, "write posting"
>> +needs to be handled. Many drivers (e.g. tg3, acenic, sym53c8xx_2)
>> +already do. I/O Port space guarantees write transactions reach the PCI
> 
>    already do this.
> 
>> +device before the CPU can continue. Writes to MMIO space allow to CPU
                                                                   ^^
>> +continue before the transaction reaches the PCI device. HW weenies
   ^
-> allow the CPU to continue

-- 
Stefan Richter
-=====-=-==- ==-- =-==-
http://arcgraph.de/sr/
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