linux-kernel - Re: [PATCH 0/3] pci: let devices flush DMA to host memory

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 27 Aug 2007 15:20:27 -0700
From:	akepner@....com
To:	Grant Grundler <grundler@...isc-linux.org>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	gregkh@...e.de,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jes Sorensen <jes@....com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH 0/3] pci: let devices flush DMA to host memory

On Mon, Aug 27, 2007 at 04:05:48PM -0600, Grant Grundler wrote:

> .....
> After reading the thread, my take is we need a more elegant way for a
> device driver to handle registration of DMA regions allocated by user
> space. The API would "make this page/region act like dma_alloc_coherent()".
> That implies strong ordering between CPU and DMA to/from the device.
> Maybe the code is the right thing and I want a name that makes
> sense in the context of current DMA API.

Need to think about this...

> 
> On IRC, willy suggested an mmap() flag and that sounds reasonable too
> though I don't know if it's feasible. 
> 

Yeah, we're doing something like this now as a band-aid solution. 
Not a flag to mmap(), but a magic offset value. But it wasn't 
acceptable to the maintainer of the mthca IB driver (Roland 
Dreier), hence the new proposal....

-- 
Arthur

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/