Messages in this thread | | | Subject | Re: SMP and mmap | Date | Sat, 18 Sep 1999 19:11:13 +0100 (BST) | From | Alan Cox <> |
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> framebuffer at the same time as the accel engine. Well one solution was to > unmap the framebuffer just before someone would access the accel engine. > Then use a no_page routine to put processes to sleep while the accel > engine was active. Then once the accel engine was idle wake up all the > processes that attempted framebuffer access. Now this soultion is far to > expensive. So I have been looking for another way.
That is expensive. It also requires you create a synchronization point at PCI level
> try to access the MMIO mmap accel regions. This would confuse most > cards. How could I prevent this from happening?
Ok if user space has fb mmapped the user is runnign X11 or a graphical full screen app 99.99999% of the time. So why not simply ignore the problem. When a user mmaps the fb finish any pending accelerations and stop using acceleration in the driver until they unmap
Alan
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