Hi, Christian,
I'm looking at adding a utility for tracking dirty pages for TTM. It's
usable for non-coherent drivers to emulate coherent memory, for example
for fbdev or if vmwgfx were to emulate coherent mappings, like required
by Vulkan or by user-space dma-buf mappings.
Basically one would need to hook up the vm_ops page_mkwrite() and
pfn_mkwrite() into ttm_bo_vm.c. That can be done with small stubs in
ttm_bo_vm.c which call new functions in the ttm_bo driver. Alternatively
we could have the driver provide the TTM vm ops, with the current as the
default. I figure the rest can be done with helpers that initially can
be part of vmwgfx and moved to TTM should other drivers be interested.
Does this sound OK with you?
/Thomas
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