linux-kernel - Re: [PATCH v3 5/7] drm/etnaviv: Switch to fdinfo helper

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Message-ID: <CAF6AEGtNANeM4b4Btso8xMreTEMiZSwUfQEJSm=7q+z=C0N9hw@mail.gmail.com>
Date:   Wed, 12 Apr 2023 15:18:26 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Christopher Healy <healych@...zon.com>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Rob Clark <robdclark@...omium.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...il.com>,
        "moderated list:DRM DRIVERS FOR VIVANTE GPU IP" 
        <etnaviv@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Cc:     Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v3 5/7] drm/etnaviv: Switch to fdinfo helper

On Wed, Apr 12, 2023 at 12:59 AM Daniel Vetter <daniel@...ll.ch> wrote:
>
> On Tue, Apr 11, 2023 at 03:56:10PM -0700, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > Signed-off-by: Rob Clark <robdclark@...omium.org>
>
> You're on an old tree, this got reverted. But I'm kinda wondering whether
> another patch on top shouldn't just includ the drm_show_fdinfo in
> DRM_GEM_FOPS macro ... There's really no good reasons for drivers to not
> have this I think?

oh, I'm roughly on msm-next, so didn't see the revert.. I'll drop this
one.  But with things in flux, this is why I decided against adding it
to DRM_GEM_FOPS.  Ie. we should do that as a followup cleanup step
once everyone is moved over to the new helpers to avoid conflicts or
build breaks when merging things via different driver trees

BR,
-R

> -Daniel
>
> > ---
> >  drivers/gpu/drm/etnaviv/etnaviv_drv.c | 10 ++++------
> >  1 file changed, 4 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> > index 44ca803237a5..170000d6af94 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> > @@ -476,9 +476,8 @@ static const struct drm_ioctl_desc etnaviv_ioctls[] = {
> >       ETNA_IOCTL(PM_QUERY_SIG, pm_query_sig, DRM_RENDER_ALLOW),
> >  };
> >
> > -static void etnaviv_fop_show_fdinfo(struct seq_file *m, struct file *f)
> > +static void etnaviv_fop_show_fdinfo(struct drm_printer *p, struct drm_file *file)
> >  {
> > -     struct drm_file *file = f->private_data;
> >       struct drm_device *dev = file->minor->dev;
> >       struct etnaviv_drm_private *priv = dev->dev_private;
> >       struct etnaviv_file_private *ctx = file->driver_priv;
> > @@ -487,8 +486,6 @@ static void etnaviv_fop_show_fdinfo(struct seq_file *m, struct file *f)
> >        * For a description of the text output format used here, see
> >        * Documentation/gpu/drm-usage-stats.rst.
> >        */
> > -     seq_printf(m, "drm-driver:\t%s\n", dev->driver->name);
> > -     seq_printf(m, "drm-client-id:\t%u\n", ctx->id);
> >
> >       for (int i = 0; i < ETNA_MAX_PIPES; i++) {
> >               struct etnaviv_gpu *gpu = priv->gpu[i];
> > @@ -507,7 +504,7 @@ static void etnaviv_fop_show_fdinfo(struct seq_file *m, struct file *f)
> >                       cur = snprintf(engine + cur, sizeof(engine) - cur,
> >                                      "%sNN", cur ? "/" : "");
> >
> > -             seq_printf(m, "drm-engine-%s:\t%llu ns\n", engine,
> > +             drm_printf(p, "drm-engine-%s:\t%llu ns\n", engine,
> >                          ctx->sched_entity[i].elapsed_ns);
> >       }
> >  }
> > @@ -515,7 +512,7 @@ static void etnaviv_fop_show_fdinfo(struct seq_file *m, struct file *f)
> >  static const struct file_operations fops = {
> >       .owner = THIS_MODULE,
> >       DRM_GEM_FOPS,
> > -     .show_fdinfo = etnaviv_fop_show_fdinfo,
> > +     .show_fdinfo = drm_fop_show_fdinfo,
> >  };
> >
> >  static const struct drm_driver etnaviv_drm_driver = {
> > @@ -529,6 +526,7 @@ static const struct drm_driver etnaviv_drm_driver = {
> >  #ifdef CONFIG_DEBUG_FS
> >       .debugfs_init       = etnaviv_debugfs_init,
> >  #endif
> > +     .show_fdinfo        = etnaviv_fop_show_fdinfo,
> >       .ioctls             = etnaviv_ioctls,
> >       .num_ioctls         = DRM_ETNAVIV_NUM_IOCTLS,
> >       .fops               = &fops,
> > --
> > 2.39.2
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch