linux-kernel - Re: [PATCH] pci: print out DMA mask info

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Date:	Thu, 09 Oct 2008 16:05:57 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Grant Grundler <grundler@...isc-linux.org>
CC:	Matthew Wilcox <matthew@....cx>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: print out DMA mask info

Grant Grundler wrote:
> On Thu, Oct 09, 2008 at 02:51:32PM -0700, Yinghai Lu wrote:
>> On Thu, Oct 9, 2008 at 2:35 PM, Matthew Wilcox <matthew@....cx> wrote:
>>> Why's that interesting to the sysadmin of the machine?  To the driver
>>> writer, certainly.  But what's the use of it to the people using the
>>> machine?
> ...
>> make linux kernel act like black box as other os?
> 
> I don't understand your reply.
> If someone thinks linux is a black box, printing this message won't help them.
> 
could find out easily why some driver doesn't set dma mask correctly.
like why 
	qlogic qla2xxx only set consistent to 64bit,
	emulex lpfc not set consistent to 64bit
> 
> "To flag use of bounce buffer or other suboptimal behaviors" could be debated.
> 
> 
> Regarding associating the output with other PCI messages, I'd hope the fact
> that the /sys entry is in the same directory as other sys files would be
> enough clue to associate those together. e.g.:
> grundler <2068>cd /sys/bus/pci/devices/0000\:01\:00.0/
> grundler <2069>ls
> broken_parity_status  driver@  irq         resource0   subsystem_device
> bus@                  enable   local_cpus  resource1   subsystem_vendor
> class                 i2c-0/   modalias    resource3   uevent
> config                i2c-1/   power/      rom         vendor
> device                i2c-2/   resource    subsystem@
> 

add dma_mask coherent_dma_mask here?

YH
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