1 config DRM_I915_USERFAULT_AUTOSUSPEND
2 int "Runtime autosuspend delay for userspace GGTT mmaps (ms)"
3 default 250 # milliseconds
5 On runtime suspend, as we suspend the device, we have to revoke
6 userspace GGTT mmaps and force userspace to take a pagefault on
7 their next access. The revocation and subsequent recreation of
8 the GGTT mmap can be very slow and so we impose a small hysteris
9 that complements the runtime-pm autosuspend and provides a lower
10 floor on the autosuspend delay.
12 May be 0 to disable the extra delay and solely use the device level
13 runtime pm autosuspend delay tunable.
15 config DRM_I915_SPIN_REQUEST
16 int "Busywait for request completion (us)"
17 default 5 # microseconds
19 Before sleeping waiting for a request (GPU operation) to complete,
20 we may spend some time polling for its completion. As the IRQ may
21 take a non-negligible time to setup, we do a short spin first to
22 check if the request will complete in the time it would have taken
23 us to enable the interrupt.
25 May be 0 to disable the initial spin. In practice, we estimate
26 the cost of enabling the interrupt (if currently disabled) to be