Hi Daniel,
On Tue, May 24, 2016 at 11:30:42PM +0200, Daniel Vetter wrote:
> On Tue, May 24, 2016 at 06:03:27PM +0200, Lukas Wunner wrote:
> > When a drm_crtc structure is destroyed with drm_crtc_cleanup(), the DRM
> > core does not turn off the crtc first and neither do the drivers. With
> > nouveau, radeon and amdgpu, this causes a runtime pm ref to be leaked on
> > driver unload if at least one crtc was enabled.
> >
> > (See usage of have_disp_power_ref in nouveau_crtc_set_config(),
> > radeon_crtc_set_config() and amdgpu_crtc_set_config()).
> >
> > Fixes: 5addcf0a5f0f ("nouveau: add runtime PM support (v0.9)")
> > Cc: Dave Airlie <airlied@xxxxxxxxxx>
> > Tested-by: Karol Herbst <nouveau@xxxxxxxxxxxxxx>
> > Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
>
> This is a core regression, we fixed it again. Previously when unreference
> drm_planes the core made sure that it's not longer in use, which had the
> side effect of shutting everything off in module unload.
>
> For a bunch of reasons we've stopped doing that, but that turned out to be
> a mistake. It's fixed since
>
> commit f2d580b9a8149735cbc4b59c4a8df60173658140
> Author: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Date: Wed May 4 14:38:26 2016 +0200
>
> drm/core: Do not preserve framebuffer on rmfb, v4.
>
> Your patch shouldn't be needed with that any more. If it still is it's
> most likely the fbdev cleanup done too late, but you /should/ get a big
> WARNING splat in that case from drm_mode_config_cleanup().
I tested it and at least with nouveau, the above-mentioned commit does *not*
solve the issue, so patch [9/9] of this series is still needed. I do not get
a WARN splat when unloading nouveau.
Best regards,
Lukas
>
> > ---
> > drivers/gpu/drm/drm_crtc.c | 13 ++++++++++++-
> > 1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> > index d2a6d95..0cd6f00 100644
> > --- a/drivers/gpu/drm/drm_crtc.c
> > +++ b/drivers/gpu/drm/drm_crtc.c
> > @@ -716,12 +716,23 @@ EXPORT_SYMBOL(drm_crtc_init_with_planes);
> > *
> > * This function cleans up @crtc and removes it from the DRM mode setting
> > * core. Note that the function does *not* free the crtc structure itself,
> > - * this is the responsibility of the caller.
> > + * this is the responsibility of the caller. If @crtc is currently enabled,
> > + * it is turned off first.
> > */
> > void drm_crtc_cleanup(struct drm_crtc *crtc)
> > {
> > struct drm_device *dev = crtc->dev;
> >
> > + if (crtc->enabled) {
> > + struct drm_mode_set modeset = {
> > + .crtc = crtc,
> > + };
> > +
> > + drm_modeset_lock_all(dev);
> > + drm_mode_set_config_internal(&modeset);
> > + drm_modeset_unlock_all(dev);
> > + }
> > +
> > kfree(crtc->gamma_store);
> > crtc->gamma_store = NULL;
> >
> > --
> > 2.8.1
> >
> > _______________________________________________
> > Nouveau mailing list
> > Nouveau@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/nouveau
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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