Re: [PATCH] drm/panfrost: Add sanity checks to submit IOCTL

[Tomeu Vizoso]

On Wed, 24 Apr 2019 at 15:20, Daniel Vetter <daniel@xxxxxxxx> wrote:
>
> On Wed, Apr 24, 2019 at 03:13:53PM +0200, Tomeu Vizoso wrote:
> > So userspace can get feedback on any error conditions, instead of going
> > ahead and things breaking later.
> >
> > Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
>
> Bonus: some igts to exercise these corner cases. It helps a lot with uapi
> review and testing.

I'm rebasing that igt branch as we speak :)

Tomeu

> -Daniel
>
> > ---
> >  drivers/gpu/drm/panfrost/panfrost_drv.c | 35 +++++++++++++++++--------
> >  1 file changed, 24 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
> > index c06af78ab833..0f2863cb8077 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> > +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> > @@ -172,13 +172,27 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
> >  {
> >       struct panfrost_device *pfdev = dev->dev_private;
> >       struct drm_panfrost_submit *args = data;
> > -     struct drm_syncobj *sync_out;
> > +     struct drm_syncobj *sync_out = NULL;
> >       struct panfrost_job *job;
> >       int ret = 0;
> >
> > +     if (!args->jc)
> > +             return -EINVAL;
> > +
> > +     if (args->requirements && args->requirements != PANFROST_JD_REQ_FS)
> > +             return -EINVAL;
> > +
> > +     if (args->out_sync > 0) {
> > +             sync_out = drm_syncobj_find(file, args->out_sync);
> > +             if (!sync_out)
> > +                     return -ENODEV;
> > +     }
> > +
> >       job = kzalloc(sizeof(*job), GFP_KERNEL);
> > -     if (!job)
> > -             return -ENOMEM;
> > +     if (!job) {
> > +             ret = -ENOMEM;
> > +             goto fail_out_sync;
> > +     }
> >
> >       kref_init(&job->refcount);
> >
> > @@ -190,25 +204,24 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
> >
> >       ret = panfrost_copy_in_sync(dev, file, args, job);
> >       if (ret)
> > -             goto fail;
> > +             goto fail_job;
> >
> >       ret = panfrost_lookup_bos(dev, file, args, job);
> >       if (ret)
> > -             goto fail;
> > +             goto fail_job;
> >
> >       ret = panfrost_job_push(job);
> >       if (ret)
> > -             goto fail;
> > +             goto fail_job;
> >
> >       /* Update the return sync object for the job */
> > -     sync_out = drm_syncobj_find(file, args->out_sync);
> > -     if (sync_out) {
> > +     if (sync_out)
> >               drm_syncobj_replace_fence(sync_out, job->render_done_fence);
> > -             drm_syncobj_put(sync_out);
> > -     }
> >
> > -fail:
> > +fail_job:
> >       panfrost_job_put(job);
> > +fail_out_sync:
> > +     drm_syncobj_put(sync_out);
> >
> >       return ret;
> >  }
> > --
> > 2.20.1
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch