On Mon, 2001-12-10 at 14:16, [EMAIL PROTECTED] wrote: > > > On Mon, 10 Dec 2001, Alan Hourihane wrote: > > > On Sun, Dec 09, 2001 at 03:29:35PM -0500, [EMAIL PROTECTED] wrote: > > > > > > Hi, I am the maintainer of V4L capture module for All-in-Wonder cards. > > > I need some help figuring out how to interface with drm. > > > > > > The problem: the module works fine, except that (at least Radeons) want > > > physical memory from AGP addressable range. So I can either write my own > > > memory allocation routines or interface with drm to do this. The second > > > being the more preferable. > > > > > > The problem is that > > > a) drm does not export headers to other modules (nothing in > > > /usr/include/linux/drmxxxx.h > > > b) looking at drm.h and drmP.h in the driver source does not yield > > > immediate answer either. All I want is to obtain an agp addressable memory > > > chunk of a certain size. > > > ba) What are those DRM() wrappers ? > > > bb) can I simply call DRM(alloc) or do I need to "acquire" drm in a > > > certain way ? > > > > > Take a look at the driver specific *_dri.c files. You can then use > > drmAddBufs with DRM_RESTRICTED (so 3D apps don't use it) and later use > > drmMap to map your area. > > Thanks for replying :)) > > Unfortunately this wont work as I need to do this from inside a kernel > module so it is able to expose v4l interface.
Can't you use the functions that are exported to userland as ioctls? > Some more questions: I've looked around drm and agpgart sourcecode and > as far as I understand (at least on x86) the memory drm allocates is > obtained anywhere with alloc_page(GFP_KERNEL). And the intel specification > for AGP3.0 explicitly states that any physical address should be > accessible. So, where does the "maximum agp addressable > memory" calculation comes from ? I'm not sure but maybe this is related to the AGP aperture size as configured in the BIOS setup? -- Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer XFree86 and DRI project member / CS student, Free Software enthusiast _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
