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drm/i915: Inifite timeout for wait ioctl

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Change the ns_timeout parameter of the wait ioctl to a signed value.
Doing this allows the kernel to provide an infinite wait when a timeout
of less than 0 is provided. This mimics select/poll.

Initially the parameter was meant to match up with the GL spec 1:1, but
after being made aware of how much 2^64 - 1 nanoseconds actually is, I
do not think anyone will ever notice the loss of 1 bit.

The infinite timeout on waiting is similar to the existing i915
userspace interface with the exception that struct_mutex is dropped
while doing the wait in this ioctl.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky
2012-06-05 15:24:24 -07:00
committed by Daniel Vetter
parent de9a35abb3
commit eac1f14fd1
2 changed files with 11 additions and 6 deletions
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include/drm/i915_drm.h
+1 -1
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@@ -893,7 +893,7 @@ struct drm_i915_gem_wait {
__u32 bo_handle;
__u32 flags;
/** Number of nanoseconds to wait, Returns time remaining. */
__u64 timeout_ns;
__s64 timeout_ns;
};
#endif /* _I915_DRM_H_ */