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| author | Mika Kuoppala | 2018-04-23 13:37:53 +0200 |
|---|---|---|
| committer | Mika Kuoppala | 2018-04-24 14:46:26 +0200 |
| commit | 3085982c6b45d7d22f76e3aa018affbc143a7370 (patch) | |
| tree | 052105559b6a4a95c0c5305ea3397102971a0db5 /drivers/gpu/drm/i915/intel_drv.h | |
| parent | drm/i915/kbl: Add KBL GT2 sku (diff) | |
| download | kernel-qcow2-linux-3085982c6b45d7d22f76e3aa018affbc143a7370.tar.gz kernel-qcow2-linux-3085982c6b45d7d22f76e3aa018affbc143a7370.tar.xz kernel-qcow2-linux-3085982c6b45d7d22f76e3aa018affbc143a7370.zip | |
drm/i915: Use ktime on wait_for
We use jiffies to determine when wait expires. However
Imre did find out that jiffies can and will do a >1
increments on certain situations [1]. When this happens
in a wait_for loop, we return timeout errorneously
much earlier than what the real wallclock would say.
We can't afford our waits to timeout prematurely.
Discard jiffies and change to ktime to detect timeouts.
v2: added bugzilla entry (Imre), added stable (Chris)
Reported-by: Imre Deak <imre.deak@intel.com>
References: https://lkml.org/lkml/2018/4/18/798 [1]
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105771
Cc: Imre Deak <imre.deak@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423113754.28424-1-mika.kuoppala@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_drv.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 44ed248f1fe9..33ff2638c92b 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -49,12 +49,12 @@ * check the condition before the timeout. */ #define __wait_for(OP, COND, US, Wmin, Wmax) ({ \ - unsigned long timeout__ = jiffies + usecs_to_jiffies(US) + 1; \ + const ktime_t end__ = ktime_add_ns(ktime_get_raw(), 1000ll * (US)); \ long wait__ = (Wmin); /* recommended min for usleep is 10 us */ \ int ret__; \ might_sleep(); \ for (;;) { \ - bool expired__ = time_after(jiffies, timeout__); \ + const bool expired__ = ktime_after(ktime_get_raw(), end__); \ OP; \ if (COND) { \ ret__ = 0; \ |