Hi!
I'm trying to incorporate a patch I got for DMA bitblt into the via drm.
Probably useful for a lot of things including Xv image transfer, Texture
downloads and Exa acceleration.
Got it working, but to really know what I'm doing, being a kernel
programming novice, could I have some help with these ones?
1.) get_user_pages() should presumably lock a page into physical memory.
Will this always cause a segfault for an invalid address?
2.) Unlocking pages previously locked with get_user_pages(): is
page_cache_release() sufficient or are more calls needed? Could the
unlocking functions be called from an interrupt handler? Is a refcount
maintained for this page locking or is it one-level only?
3.) Is memory allocated with vmalloc always locked into physical memory
until freed?
4.) Are there any DRM macros for the above, to make porting to other
OS'es easier?
Thanks for any advice,
Thomas Hellström
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