I'm wading through DRM context switches at the kernel level now.
I've gotten lost a bit -- I'm missing a chunk o stuff at the
(*) point.
User wants a "context switch" to happen.
Calls ioctl(DRM_IOCTL_SWITCH_CTX)
Kernel goes into DRM(context_switch)
Sets an internal "current context" Variable
Usually writes out "C oldnum newnum" to user fd
(which has the user sideeffect of triggering SIGIO)
(*)Kernel (goes to sleep? "wakes something up"???)
until user does another ioctl, this time with ioctl(DRM_IOCTL_NEW_CTX)
[what is dev->context_wait for?]
[the second ioctl triggers DRM(context_switch_complete), which does
something to dev->context_wait again]
I dont get why there is a need for both DRM_IOCTL_SWITCH_CTX and
DRM_IOCTL_NEW_CTX
And what does DRM_FLAG_NOCTX really signify?
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