Hi Jesse !
Haven't had much time to investigate the problem I've been talking to
you and David about but from what I can see in the code, we're probably
hitting this in drm_mmap_locked() in drm_vm.c :
/* Check for valid size. */
if (map->size < vma->vm_end - vma->vm_start)
return -EINVAL;
Now, this won't do any good for example if the SAREA is 8K (which I
think is about that nowadays) and the machine PAGE_SIZE is 64K.
There is indeed a possible problem of allowing clients to map more than
the resource specifically specified in the map, so just removing that
test may not be the best approach though.
I would suggest maybe bumping the SAREA to be a multiple of the page
size for now. I think that should get us going. I'll have a go at a
patch on monday unless there's an objection. That won't help for things
like MMIO register space that isn't a multiple of the page size but
fortunately that won't be hitting my with radeon for now and we can deal
with that when we need to.
Any objection ?
Cheers,
Ben.
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