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b27e35ae5b
Do not allow runtime pm autosuspend to remove userspace GGTT mmaps too quickly. For example, igt sets the autosuspend delay to 0, and so we immediately attempt to perform runtime suspend upon releasing the wakeref. Unfortunately, that involves tearing down GGTT mmaps as they require an active device. Override the autosuspend for GGTT mmaps, by keeping the wakeref around for 250ms after populating the PTE for a fresh mmap. v2: Prefer refcount_t for its under/overflow error detection v3: Flush the user runtime autosuspend prior to system system. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190527115114.13448-1-chris@chris-wilson.co.uk
28 lines
1.1 KiB
Plaintext
28 lines
1.1 KiB
Plaintext
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_SPIN_REQUEST
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int
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default 5 # microseconds
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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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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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