Date: Wed, 13 Feb 2002 13:35:13 +1100 (EST) From: Iain Templeton <iain@research.canon.com.au> To: mike varga <mike.varga@cavium.com> Cc: freebsd-arch@freebsd.org Subject: Re: bus_dma_load_uio() function Message-ID: <Pine.LNX.4.10.10202131331220.22737-100000@blow.research.canon.com.au> In-Reply-To: <000701c1b42e$7835eda0$b210a8c0@netscreen5>
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On Tue, 12 Feb 2002, mike varga wrote: > Yes I did, but thank you > for replying. > > My question essentially > boils down to,"How do you > map and lock user pages (buffers) > for use in a driver that wants > to do a DMA directly > from/to them. > > It removes unnecessary > copies. > We use vm_map_user_pageable() for our device driver, seems to work. We get the physical address as part of the callback for bus_dmamap_load(). We manage the data in the uio struct ourselves, as the data has some extra header information that needs to be processed. Iain To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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