SwapContext hook back

Hi, I found that for DRI callback 'SwapContext' hook handler, seems no driver interested with it, except for old glint video driver do real work in it. Does it mean context switch concept outdated for current graphics hardware, but I found that intel hardware has logical context save/store command

direct I/O instruction access to graphics register is sync with CPU?

Hi, friends: Sorry for my stupid question but I think right here can help me. As I know, DMA/CommandParser or no matter what you call can provide asynchronous execuation of graphics commands with CPU execution, and the direct I/O of course is synchronous with instructions executed on CPU, but wha