From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Date: Mon, 22 Apr 2002 23:40:14 +0000 Subject: [Linux-ia64] Re: PCI DAC routines for SN 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 Mon, Apr 22, 2002 at 04:07:33PM -0700, David Mosberger wrote: > Oh man, what a mess! Have you checked with Dave Miller? I suspect > he might not like this. I'm not terribly fond of it either as it He was the one that implemented it I thought. His assertion was that since most chipsets don't handle 64 bit coherent allocations well, the consistent interface should be forced to return a 32 bit address (is that right Dave?). I don't mind that as long as we add a DAC consistent call, otherwise I'd like to leave it up to the platform (i.e. ia64/sn could return a 64 bit address and sparc64 could do 32). > makes it even more confusing as to when to use the DAC interface. I'd > rather see a separate "alloc_consistent" routine, which doesn't isn't > on <4GB addresses. I agree, Cc'ing Dave Miller. Thanks, Jesse