From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Thu, 15 May 2003 15:06:04 +0000 Subject: [Linux-ia64] Re: 64 Bits DMA Addresses for Alloc Consistent Interfaces. Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Thu, 15 May 2003 08:17:58 -0500, Colin Ngam said: Colin> Anyway, to make a long story short, we like to "extend" these Colin> interfaces to return DMA addresses of 64 bits if and when the Colin> driver has the full capabality to support DAC - via it's DMA Colin> mask capability setting. Colin> This extention will not break current usages of these Colin> interface, and as driver changes, this extension will enable Colin> platforms to support all of it's Physical Memory via the Colin> above 2 Interfaces without exhausting limited system mapping Colin> resources. James and I have been discussing this very point for the last week or so. My preferred solution is to add an explicit dma-mask argument to coherent/non-coherent allocators, but James prefers to do this via a new GFP flag (GFP_DMA32 or some such). --david