| 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. |
