On Fri, 19 Jun 2015, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote:
> We've never figured out the magic trick to make irq vs. seqno
> updates coherent, only tricks to make it work. And since
>
> commit 094f9a54e35500739da185cdb78f2e92fc379458
> Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Date: Wed Sep 25 17:34:55 2013 +0100
>
> drm/i915: Fix __wait_seqno to use true infinite timeouts
>
> we automatically fall back to an irq augmented with polling scheme
> after the first missed interrupt. There's really nothing else we can
> do, hence tune down the message to informational level. It's still
> useful for users in case it reliable preceedes a hard system hang.
>
> v2: Use NOTICE since it might be of value for bug reports (Chris).
>
> Cc: Mark Janes <mark.a.janes@xxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index e6bb72dca3ff..5072fb49367e 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2946,8 +2946,8 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
> /* Issue a wake-up to catch stuck h/w. */
> if (!test_and_set_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings)) {
> if (!(dev_priv->gpu_error.test_irq_rings & intel_ring_flag(ring)))
> - DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
> - ring->name);
> + DRM_NOTICE("Hangcheck timer elapsed... %s idle\n",
drivers/gpu/drm/i915/i915_irq.c: In function ‘i915_hangcheck_elapsed’:
drivers/gpu/drm/i915/i915_irq.c:2949:8: error: implicit declaration of function ‘DRM_NOTICE’ [-Werror=implicit-function-declaration]
DRM_NOTICE("Hangcheck timer elapsed... %s idle\n",
^
BR,
Jani.
> + ring->name);
> else
> DRM_INFO("Fake missed irq on %s\n",
> ring->name);
> --
> 2.1.4
>
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--
Jani Nikula, Intel Open Source Technology Center
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