^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) config DRM_I915_FENCE_TIMEOUT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) int "Timeout for unsignaled foreign fences (ms, jiffy granularity)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) default 10000 # milliseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) When listening to a foreign fence, we install a supplementary timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) to ensure that we are always signaled and our userspace is able to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) make forward progress. This value specifies the timeout used for an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) unsignaled foreign fence.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) May be 0 to disable the timeout, and rely on the foreign fence being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) eventually signaled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) config DRM_I915_USERFAULT_AUTOSUSPEND
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) int "Runtime autosuspend delay for userspace GGTT mmaps (ms)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) default 250 # milliseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) On runtime suspend, as we suspend the device, we have to revoke
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) userspace GGTT mmaps and force userspace to take a pagefault on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) their next access. The revocation and subsequent recreation of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) the GGTT mmap can be very slow and so we impose a small hysteris
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) that complements the runtime-pm autosuspend and provides a lower
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) floor on the autosuspend delay.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) May be 0 to disable the extra delay and solely use the device level
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) runtime pm autosuspend delay tunable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) config DRM_I915_HEARTBEAT_INTERVAL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) int "Interval between heartbeat pulses (ms)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) default 2500 # milliseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) The driver sends a periodic heartbeat down all active engines to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) check the health of the GPU and undertake regular house-keeping of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) internal driver state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) This is adjustable via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /sys/class/drm/card?/engine/*/heartbeat_interval_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) May be 0 to disable heartbeats and therefore disable automatic GPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) hang detection.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) config DRM_I915_PREEMPT_TIMEOUT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int "Preempt timeout (ms, jiffy granularity)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) default 640 # milliseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) How long to wait (in milliseconds) for a preemption event to occur
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) when submitting a new context via execlists. If the current context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) does not hit an arbitration point and yield to HW before the timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) expires, the HW will be reset to allow the more important context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) to execute.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) This is adjustable via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /sys/class/drm/card?/engine/*/preempt_timeout_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) May be 0 to disable the timeout.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) The compiled in default may get overridden at driver probe time on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) certain platforms and certain engines which will be reflected in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) sysfs control.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) config DRM_I915_MAX_REQUEST_BUSYWAIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) int "Busywait for request completion limit (ns)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) default 8000 # nanoseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) Before sleeping waiting for a request (GPU operation) to complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) we may spend some time polling for its completion. As the IRQ may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) take a non-negligible time to setup, we do a short spin first to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) check if the request will complete in the time it would have taken
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) us to enable the interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) This is adjustable via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /sys/class/drm/card?/engine/*/max_busywait_duration_ns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) May be 0 to disable the initial spin. In practice, we estimate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) the cost of enabling the interrupt (if currently disabled) to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) a few microseconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) config DRM_I915_STOP_TIMEOUT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) int "How long to wait for an engine to quiesce gracefully before reset (ms)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) default 100 # milliseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) By stopping submission and sleeping for a short time before resetting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) the GPU, we allow the innocent contexts also on the system to quiesce.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) It is then less likely for a hanging context to cause collateral
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) damage as the system is reset in order to recover. The corollary is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) that the reset itself may take longer and so be more disruptive to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) interactive or low latency workloads.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) This is adjustable via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /sys/class/drm/card?/engine/*/stop_timeout_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) config DRM_I915_TIMESLICE_DURATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int "Scheduling quantum for userspace batches (ms, jiffy granularity)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) default 1 # milliseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) When two user batches of equal priority are executing, we will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) alternate execution of each batch to ensure forward progress of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) all users. This is necessary in some cases where there may be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) an implicit dependency between those batches that requires
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) concurrent execution in order for them to proceed, e.g. they
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) interact with each other via userspace semaphores. Each context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) is scheduled for execution for the timeslice duration, before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) switching to the next context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) This is adjustable via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /sys/class/drm/card?/engine/*/timeslice_duration_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) May be 0 to disable timeslicing.
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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