1config DRM_I915_REQUEST_TIMEOUT
2	int "Default timeout for requests (ms)"
3	default 20000 # milliseconds
4	help
5	  Configures the default timeout after which any user submissions will
6	  be forcefully terminated.
7
8	  Beware setting this value lower, or close to heartbeat interval
9	  rounded to whole seconds times three, in order to avoid allowing
10	  misbehaving applications causing total rendering failure in unrelated
11	  clients.
12
13	  May be 0 to disable the timeout.
14
15config DRM_I915_FENCE_TIMEOUT
16	int "Timeout for unsignaled foreign fences (ms, jiffy granularity)"
17	default 10000 # milliseconds
18	help
19	  When listening to a foreign fence, we install a supplementary timer
20	  to ensure that we are always signaled and our userspace is able to
21	  make forward progress. This value specifies the timeout used for an
22	  unsignaled foreign fence.
23
24	  May be 0 to disable the timeout, and rely on the foreign fence being
25	  eventually signaled.
26
27config DRM_I915_USERFAULT_AUTOSUSPEND
28	int "Runtime autosuspend delay for userspace GGTT mmaps (ms)"
29	default 250 # milliseconds
30	help
31	  On runtime suspend, as we suspend the device, we have to revoke
32	  userspace GGTT mmaps and force userspace to take a pagefault on
33	  their next access. The revocation and subsequent recreation of
34	  the GGTT mmap can be very slow and so we impose a small hysteris
35	  that complements the runtime-pm autosuspend and provides a lower
36	  floor on the autosuspend delay.
37
38	  May be 0 to disable the extra delay and solely use the device level
39	  runtime pm autosuspend delay tunable.
40
41config DRM_I915_HEARTBEAT_INTERVAL
42	int "Interval between heartbeat pulses (ms)"
43	default 2500 # milliseconds
44	help
45	  The driver sends a periodic heartbeat down all active engines to
46	  check the health of the GPU and undertake regular house-keeping of
47	  internal driver state.
48
49	  This is adjustable via
50	  /sys/class/drm/card?/engine/*/heartbeat_interval_ms
51
52	  May be 0 to disable heartbeats and therefore disable automatic GPU
53	  hang detection.
54
55config DRM_I915_PREEMPT_TIMEOUT
56	int "Preempt timeout (ms, jiffy granularity)"
57	default 640 # milliseconds
58	help
59	  How long to wait (in milliseconds) for a preemption event to occur
60	  when submitting a new context via execlists. If the current context
61	  does not hit an arbitration point and yield to HW before the timer
62	  expires, the HW will be reset to allow the more important context
63	  to execute.
64
65	  This is adjustable via
66	  /sys/class/drm/card?/engine/*/preempt_timeout_ms
67
68	  May be 0 to disable the timeout.
69
70	  The compiled in default may get overridden at driver probe time on
71	  certain platforms and certain engines which will be reflected in the
72	  sysfs control.
73
74config DRM_I915_MAX_REQUEST_BUSYWAIT
75	int "Busywait for request completion limit (ns)"
76	default 8000 # nanoseconds
77	help
78	  Before sleeping waiting for a request (GPU operation) to complete,
79	  we may spend some time polling for its completion. As the IRQ may
80	  take a non-negligible time to setup, we do a short spin first to
81	  check if the request will complete in the time it would have taken
82	  us to enable the interrupt.
83
84	  This is adjustable via
85	  /sys/class/drm/card?/engine/*/max_busywait_duration_ns
86
87	  May be 0 to disable the initial spin. In practice, we estimate
88	  the cost of enabling the interrupt (if currently disabled) to be
89	  a few microseconds.
90
91config DRM_I915_STOP_TIMEOUT
92	int "How long to wait for an engine to quiesce gracefully before reset (ms)"
93	default 100 # milliseconds
94	help
95	  By stopping submission and sleeping for a short time before resetting
96	  the GPU, we allow the innocent contexts also on the system to quiesce.
97	  It is then less likely for a hanging context to cause collateral
98	  damage as the system is reset in order to recover. The corollary is
99	  that the reset itself may take longer and so be more disruptive to
100	  interactive or low latency workloads.
101
102	  This is adjustable via
103	  /sys/class/drm/card?/engine/*/stop_timeout_ms
104
105config DRM_I915_TIMESLICE_DURATION
106	int "Scheduling quantum for userspace batches (ms, jiffy granularity)"
107	default 1 # milliseconds
108	help
109	  When two user batches of equal priority are executing, we will
110	  alternate execution of each batch to ensure forward progress of
111	  all users. This is necessary in some cases where there may be
112	  an implicit dependency between those batches that requires
113	  concurrent execution in order for them to proceed, e.g. they
114	  interact with each other via userspace semaphores. Each context
115	  is scheduled for execution for the timeslice duration, before
116	  switching to the next context.
117
118	  This is adjustable via
119	  /sys/class/drm/card?/engine/*/timeslice_duration_ms
120
121	  May be 0 to disable timeslicing.
122