linux-kernel - Re: Implementing NVMHCI...

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Date:	Sat, 11 Apr 2009 15:54:41 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Linux IDE mailing list <linux-ide@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Implementing NVMHCI...

Alan Cox wrote:
>> 	  The spec describes the sector size as
>> 	  "512, 1k, 2k, 4k, 8k, etc."   It will be interesting to reach
>> 	  "etc" territory.
> 
> Over 4K will be fun.
> 
>> - ahci.c becomes a tiny stub with a pci_device_id match table,
>>    calling functions in libahci.c.
> 
> It needs to a be a little bit bigger because of the folks wanting to do
> non PCI AHCI, so you need a little bit of PCI wrapping etc

True...


>>    With a brand new command set, might as well avoid SCSI completely IMO,
>>    and create a brand new block device.
> 
> Providing we allow for the (inevitable ;)) joys of NVHCI over SAS etc 8)

Perhaps...  from what I can tell, this is a direct, asynchronous NVM 
interface.  It appears to lack any concept of bus or bus enumeration. 
No worries about link up/down, storage device hotplug, etc.  (you still 
have PCI hotplug case, of course)

	Jeff



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