[PATCH] drm/amdgpu: treat negative lockup timeout as 'infinite timeout'

[Quan, Evan]

Thanks! Just sent out a V2 version with this addressed.

> -----Original Message-----
> From: Christian König <ckoenig.leichtzumerken at gmail.com>
> Sent: 2019年5月6日 19:26
> To: Quan, Evan <Evan.Quan at amd.com>; amd-gfx at lists.freedesktop.org
> Cc: Koenig, Christian <Christian.Koenig at amd.com>
> Subject: Re: [PATCH] drm/amdgpu: treat negative lockup timeout as 'infinite
> timeout'
> 
> [CAUTION: External Email]
> 
> Am 05.05.19 um 16:23 schrieb Evan Quan:
> > Negative lockup timeout is valid and will be treated as 'infinite
> > timeout'.
> >
> > Change-Id: I0d8387956a9c744073c0281ef2e1a547d4f16dec
> > Signed-off-by: Evan Quan <evan.quan at amd.com>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 14 ++++++++++----
> >   1 file changed, 10 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > index 5b03e17e6e06..4d6dff6855f8 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > @@ -233,13 +233,14 @@ module_param_named(msi, amdgpu_msi, int,
> 0444);
> >    * Set GPU scheduler timeout value in ms.
> >    *
> >    * The format can be [Non-Compute] or [GFX,Compute,SDMA,Video].
> That
> > is there can be one or
> > - * multiple values specified. 0 and negative values are invalidated.
> > They will be adjusted
> > - * to default timeout.
> > + * multiple values specified.
> >    *  - With one value specified, the setting will apply to all non-compute
> jobs.
> >    *  - With multiple values specified, the first one will be for GFX. The
> second one is for Compute.
> >    *    And the third and fourth ones are for SDMA and Video.
> >    * By default(with no lockup_timeout settings), the timeout for all non-
> compute(GFX, SDMA and Video)
> >    * jobs is 10000. And there is no timeout enforced on compute jobs.
> > + * Value 0 is invalidated, will be adjusted to default timeout settings.
> > + * Negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET).
> >    */
> >   MODULE_PARM_DESC(lockup_timeout, "GPU lockup timeout in ms
> (default: 10000 for non-compute jobs and no timeout for compute jobs), "
> >               "format is [Non-Compute] or [GFX,Compute,SDMA,Video]");
> > @@ -1248,11 +1249,16 @@ int
> amdgpu_device_get_job_timeout_settings(struct amdgpu_device *adev)
> >                       if (ret)
> >                               return ret;
> >
> > -                     /* Invalidate 0 and negative values */
> > -                     if (timeout <= 0) {
> > +                     /*
> > +                      * Value 0 will be adjusted to default timeout settings.
> > +                      * Negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET).
> > +                      */
> > +                     if (!timeout) {
> >                               index++;
> >                               continue;
> >                       }
> > +                     if (timeout < 0)
> > +                             timeout = MAX_JIFFY_OFFSET;
> 
> This is superfluous and maybe even harmful, msecs_to_jiffies() should take
> care of this conversion.
> 
> Maybe even convert the values directly here.
> 
> Christian.
> 
> >
> >                       switch (index++) {
> >                       case 0: