Messages in this thread | | | Subject | Re: can device drivers return non-ram via vm_ops->nopage? | From | Arjan van de Ven <> | Date | Sun, 21 Mar 2004 10:52:43 +0100 |
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On Sun, 2004-03-21 at 00:54, Russell King wrote: > On Sat, Mar 20, 2004 at 02:45:18PM -0800, William Lee Irwin III wrote: > > Is there any possibility of an extension to remap_area_pages() that > > could resolve this? I can't say I fully understood and/or remember > > the issue with it that you pointed out. > > The issues are: > > 1. ALSA wants to mmap the buffer used to transfer data to/from the > card into user space. This buffer may be direct-mapped RAM, > memory allocated via dma_alloc_coherent(), an on-device buffer, > or anything else.
fwiw an ideal DRI/DRM driver would do the same with the video cards ringbuffer so the problem isn't unique to alsa, it's a generic issue. [unhandled content-type:application/pgp-signature] | |