Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758731AbZDKTyz (ORCPT ); Sat, 11 Apr 2009 15:54:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756552AbZDKTyq (ORCPT ); Sat, 11 Apr 2009 15:54:46 -0400 Received: from srv5.dvmed.net ([207.36.208.214]:57674 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754655AbZDKTyp (ORCPT ); Sat, 11 Apr 2009 15:54:45 -0400 Message-ID: <49E0F581.6010901@garzik.org> Date: Sat, 11 Apr 2009 15:54:41 -0400 From: Jeff Garzik User-Agent: Thunderbird 2.0.0.21 (X11/20090320) MIME-Version: 1.0 To: Alan Cox CC: Linux IDE mailing list , LKML , Jens Axboe , Arjan van de Ven , Linus Torvalds Subject: Re: Implementing NVMHCI... References: <49E0D47B.9070205@garzik.org> <20090411203246.513a0892@lxorguk.ukuu.org.uk> In-Reply-To: <20090411203246.513a0892@lxorguk.ukuu.org.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.4 (----) X-Spam-Report: SpamAssassin version 3.2.5 on srv5.dvmed.net summary: Content analysis details: (-4.4 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1135 Lines: 35 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/