config DRM_I915_FENCE_TIMEOUT
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int "Timeout for unsignaled foreign fences (ms, jiffy granularity)"
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default 10000 # milliseconds
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help
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When listening to a foreign fence, we install a supplementary timer
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to ensure that we are always signaled and our userspace is able to
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make forward progress. This value specifies the timeout used for an
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unsignaled foreign fence.
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May be 0 to disable the timeout, and rely on the foreign fence being
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eventually signaled.
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config DRM_I915_USERFAULT_AUTOSUSPEND
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int "Runtime autosuspend delay for userspace GGTT mmaps (ms)"
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default 250 # milliseconds
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help
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On runtime suspend, as we suspend the device, we have to revoke
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userspace GGTT mmaps and force userspace to take a pagefault on
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their next access. The revocation and subsequent recreation of
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the GGTT mmap can be very slow and so we impose a small hysteris
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that complements the runtime-pm autosuspend and provides a lower
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floor on the autosuspend delay.
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May be 0 to disable the extra delay and solely use the device level
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runtime pm autosuspend delay tunable.
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config DRM_I915_HEARTBEAT_INTERVAL
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int "Interval between heartbeat pulses (ms)"
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default 2500 # milliseconds
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help
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The driver sends a periodic heartbeat down all active engines to
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check the health of the GPU and undertake regular house-keeping of
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internal driver state.
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This is adjustable via
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/sys/class/drm/card?/engine/*/heartbeat_interval_ms
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May be 0 to disable heartbeats and therefore disable automatic GPU
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hang detection.
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config DRM_I915_PREEMPT_TIMEOUT
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int "Preempt timeout (ms, jiffy granularity)"
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default 640 # milliseconds
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help
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How long to wait (in milliseconds) for a preemption event to occur
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when submitting a new context via execlists. If the current context
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does not hit an arbitration point and yield to HW before the timer
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expires, the HW will be reset to allow the more important context
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to execute.
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This is adjustable via
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/sys/class/drm/card?/engine/*/preempt_timeout_ms
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May be 0 to disable the timeout.
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The compiled in default may get overridden at driver probe time on
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certain platforms and certain engines which will be reflected in the
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sysfs control.
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config DRM_I915_MAX_REQUEST_BUSYWAIT
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int "Busywait for request completion limit (ns)"
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default 8000 # nanoseconds
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help
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Before sleeping waiting for a request (GPU operation) to complete,
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we may spend some time polling for its completion. As the IRQ may
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take a non-negligible time to setup, we do a short spin first to
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check if the request will complete in the time it would have taken
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us to enable the interrupt.
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This is adjustable via
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/sys/class/drm/card?/engine/*/max_busywait_duration_ns
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May be 0 to disable the initial spin. In practice, we estimate
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the cost of enabling the interrupt (if currently disabled) to be
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a few microseconds.
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config DRM_I915_STOP_TIMEOUT
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int "How long to wait for an engine to quiesce gracefully before reset (ms)"
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default 100 # milliseconds
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help
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By stopping submission and sleeping for a short time before resetting
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the GPU, we allow the innocent contexts also on the system to quiesce.
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It is then less likely for a hanging context to cause collateral
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damage as the system is reset in order to recover. The corollary is
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that the reset itself may take longer and so be more disruptive to
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interactive or low latency workloads.
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This is adjustable via
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/sys/class/drm/card?/engine/*/stop_timeout_ms
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config DRM_I915_TIMESLICE_DURATION
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int "Scheduling quantum for userspace batches (ms, jiffy granularity)"
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default 1 # milliseconds
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help
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When two user batches of equal priority are executing, we will
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alternate execution of each batch to ensure forward progress of
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all users. This is necessary in some cases where there may be
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an implicit dependency between those batches that requires
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concurrent execution in order for them to proceed, e.g. they
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interact with each other via userspace semaphores. Each context
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is scheduled for execution for the timeslice duration, before
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switching to the next context.
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This is adjustable via
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/sys/class/drm/card?/engine/*/timeslice_duration_ms
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May be 0 to disable timeslicing.
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