In case of VSync is active (for the driver this means it shall take
in account watchdog policy and ensure fast execution of PresentDisplayOnly
callback) allocate bitmaps for drawable objects using non-forced requests.
If immediate allocation is not possible, place entire bitmap into memory
chunk allocated from the OS.
If bitmap is allocated from device memory, but one of later
chunks can't be allocated, allocate this and further chunks from
OS memory. All these 'delayed' allocations placed into linked list
which root entry is part of QXLOutput structure.
>From separate thread, before sending drawable objects down, review
the list of delayed chunks and allocate device memory (forced) to
all of them.
The cost of solution is 2 pointers added to each drawable or cursor
object.
Cursor commands currently do not use them; in future we have an option
to offload also cursor commands.
Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>
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