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drm/i915: Squelch any ktime/jiffie rounding errors for wait-ioctl

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We wait upon jiffies, but report the time elapsed using a
high-resolution timer. This discrepancy can lead to us timing out the
wait prior to us reporting the elapsed time as complete.

This restores the squelching lost in commit e95433c73a ("drm/i915:
Rearrange i915_wait_request() accounting with callers").

Fixes: e95433c73a ("drm/i915: Rearrange i915_wait_request() accounting with callers")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: <drm-intel-fixes@lists.freedesktop.org> # v4.10-rc1+
Cc: stable@vger.kernel.org
Link: http://patchwork.freedesktop.org/patch/msgid/20170216125441.30923-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-02-16 12:54:41 +00:00
parent bbdf0b2ff3
commit c1d2061b28
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/i915/i915_gem.c
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@ -3072,6 +3072,16 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
args->timeout_ns -= ktime_to_ns(ktime_sub(ktime_get(), start));
if (args->timeout_ns < 0)
args->timeout_ns = 0;
/*
* Apparently ktime isn't accurate enough and occasionally has a
* bit of mismatch in the jiffies<->nsecs<->ktime loop. So patch
* things up to make the test happy. We allow up to 1 jiffy.
*
* This is a regression from the timespec->ktime conversion.
*/
if (ret == -ETIME && !nsecs_to_jiffies(args->timeout_ns))
args->timeout_ns = 0;
}
i915_gem_object_put(obj);