xref: /linux/drivers/gpu/drm/i915/Kconfig.profile (revision 71e2f4dd5a65bd8dbca0b77661e75eea471168f8)
1config DRM_I915_USERFAULT_AUTOSUSPEND
2	int "Runtime autosuspend delay for userspace GGTT mmaps (ms)"
3	default 250 # milliseconds
4	help
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.
11
12	  May be 0 to disable the extra delay and solely use the device level
13	  runtime pm autosuspend delay tunable.
14
15config DRM_I915_SPIN_REQUEST
16	int "Busywait for request completion (us)"
17	default 5 # microseconds
18	help
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.
24
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
27	  a few microseconds.
28