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config DRM_I915_USERFAULT_AUTOSUSPEND
int "Runtime autosuspend delay for userspace GGTT mmaps (ms)"
default 250 # milliseconds
help
On runtime suspend, as we suspend the device, we have to revoke
userspace GGTT mmaps and force userspace to take a pagefault on
their next access. The revocation and subsequent recreation of
the GGTT mmap can be very slow and so we impose a small hysteris
that complements the runtime-pm autosuspend and provides a lower
floor on the autosuspend delay.
May be 0 to disable the extra delay and solely use the device level
runtime pm autosuspend delay tunable.
config DRM_I915_SPIN_REQUEST
int "Busywait for request completion (us)"
default 5 # microseconds
help
Before sleeping waiting for a request (GPU operation) to complete,
we may spend some time polling for its completion. As the IRQ may
take a non-negligible time to setup, we do a short spin first to
check if the request will complete in the time it would have taken
us to enable the interrupt.
May be 0 to disable the initial spin. In practice, we estimate
the cost of enabling the interrupt (if currently disabled) to be
a few microseconds.
config DRM_I915_STOP_TIMEOUT
int "How long to wait for an engine to quiesce gracefully before reset (ms)"
default 100 # milliseconds
help
By stopping submission and sleeping for a short time before resetting
the GPU, we allow the innocent contexts also on the system to quiesce.
It is then less likely for a hanging context to cause collateral
damage as the system is reset in order to recover. The corollary is
that the reset itself may take longer and so be more disruptive to
interactive or low latency workloads.
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