From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David S. Miller" Date: Thu, 15 May 2003 23:53:30 +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 From: Colin Ngam Date: Thu, 15 May 2003 18:32:31 -0500 I do not understand what you are saying .. how would a consistent_dma_mask attribute in the device struct helps pci_alloc_consistent() to return a dma hanlde that can have the Upper 32 Bits Non 0's, and, moreover, these Upper 32 Bits are not constants, but can vary greatly, and is part of the 64 bit Physical System Memory Address? The mask says that the consistent address "can" have the upper 32-bits non-zero. Then you define a consistent_dma_attrs bitmask that can define things like "requires >4GB address" etc. Again, all of this is device attribute stuff and not an issue concerning the DMA api calls. But I am ever further confused, how do things like tg3 cards even function TODAY on any PCI-X systems.