On Wed, Feb 15, 2017 at 03:56:09PM +0200, Jani Nikula wrote:
> On Wed, 25 Jan 2017, Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> wrote:
> > This was somehow lost between v3 and the merged version in Maarten's
> > patch merged as:
> >
> > 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.
> >
> > This introduces a slight behavioral change to rmfb. Instead of
> > disabling a crtc when the primary plane is disabled, we try to
> > preserve it.
> >
> > Apart from old versions of the vmwgfx xorg driver, there is
> > nothing depending on rmfb disabling a crtc. Since vmwgfx is
> > a legacy driver we can safely only disable the plane with atomic.
> >
> > If this commit is rejected by the driver then we will still fall
> > back to the old behavior and turn off the crtc.
> >
> > v2:
> > - Remove plane->fb assignment, done by drm_atomic_clean_old_fb.
> > - Add WARN_ON when atomic_remove_fb fails.
> > - Always call drm_atomic_state_put.
> > v3:
> > - Use drm_drv_uses_atomic_modeset
> > - Handle the case where the first plane-disable-only commit fails
> > with -EINVAL. Some drivers do not support this, fall back to
> > disabling all crtc's in this case.
> >
> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> > Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
>
> Pushed to drm-misc-next-fixes, and sent the pull request to Dave. Thanks
> for the patch.
I verified yesterday that this patch will cause a regression for vmwgfx
multi-mon. Can we hold off on this?
>
> BR,
> Jani.
>
>
> > ---
> > drivers/gpu/drm/drm_atomic.c | 106 ++++++++++++++++++++++++++++++++++++
> > drivers/gpu/drm/drm_crtc_internal.h | 1 +
> > drivers/gpu/drm/drm_framebuffer.c | 7 +++
> > 3 files changed, 114 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> > index 723392fc98c8..c79ab8048435 100644
> > --- a/drivers/gpu/drm/drm_atomic.c
> > +++ b/drivers/gpu/drm/drm_atomic.c
> > @@ -2058,6 +2058,112 @@ static void complete_crtc_signaling(struct drm_device *dev,
> > kfree(fence_state);
> > }
> >
> > +int drm_atomic_remove_fb(struct drm_framebuffer *fb)
> > +{
> > + struct drm_modeset_acquire_ctx ctx;
> > + struct drm_device *dev = fb->dev;
> > + struct drm_atomic_state *state;
> > + struct drm_plane *plane;
> > + struct drm_connector *conn;
> > + struct drm_connector_state *conn_state;
> > + int i, ret = 0;
> > + unsigned plane_mask, disable_crtcs = false;
> > +
> > + state = drm_atomic_state_alloc(dev);
> > + if (!state)
> > + return -ENOMEM;
> > +
> > + drm_modeset_acquire_init(&ctx, 0);
> > + state->acquire_ctx = &ctx;
> > +
> > +retry:
> > + plane_mask = 0;
> > + ret = drm_modeset_lock_all_ctx(dev, &ctx);
> > + if (ret)
> > + goto unlock;
> > +
> > + drm_for_each_plane(plane, dev) {
> > + struct drm_plane_state *plane_state;
> > +
> > + if (plane->state->fb != fb)
> > + continue;
> > +
> > + plane_state = drm_atomic_get_plane_state(state, plane);
> > + if (IS_ERR(plane_state)) {
> > + ret = PTR_ERR(plane_state);
> > + goto unlock;
> > + }
> > +
> > + /*
> > + * Some drivers do not support keeping crtc active with the
> > + * primary plane disabled. If we fail to commit with -EINVAL
> > + * then we will try to perform the same commit but with all
> > + * crtc's disabled for primary planes as well.
> > + */
> > + if (disable_crtcs && plane_state->crtc->primary == plane) {
> > + struct drm_crtc_state *crtc_state;
> > +
> > + crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc);
> > +
> > + ret = drm_atomic_add_affected_connectors(state, plane_state->crtc);
> > + if (ret)
> > + goto unlock;
> > +
> > + crtc_state->active = false;
> > + ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
> > + if (ret)
> > + goto unlock;
> > + }
> > +
> > + drm_atomic_set_fb_for_plane(plane_state, NULL);
> > + ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
> > + if (ret)
> > + goto unlock;
> > +
> > + plane_mask |= BIT(drm_plane_index(plane));
> > +
> > + plane->old_fb = plane->fb;
> > + }
> > +
> > + /* This list is only not empty when disable_crtcs is set. */
> > + for_each_connector_in_state(state, conn, conn_state, i) {
> > + ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
> > +
> > + if (ret)
> > + goto unlock;
> > + }
> > +
> > + if (plane_mask)
> > + ret = drm_atomic_commit(state);
> > +
> > +unlock:
> > + if (plane_mask)
> > + drm_atomic_clean_old_fb(dev, plane_mask, ret);
> > +
> > + if (ret == -EDEADLK) {
> > + drm_modeset_backoff(&ctx);
> > + goto retry;
> > + }
> > +
> > + drm_atomic_state_put(state);
> > +
> > + if (ret == -EINVAL && !disable_crtcs) {
> > + disable_crtcs = true;
> > +
> > + state = drm_atomic_state_alloc(dev);
> > + if (state) {
> > + state->acquire_ctx = &ctx;
> > + goto retry;
> > + }
> > + ret = -ENOMEM;
> > + }
> > +
> > + drm_modeset_drop_locks(&ctx);
> > + drm_modeset_acquire_fini(&ctx);
> > +
> > + return ret;
> > +}
> > +
> > int drm_mode_atomic_ioctl(struct drm_device *dev,
> > void *data, struct drm_file *file_priv)
> > {
> > diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
> > index 724c329186d5..d98a683d31d0 100644
> > --- a/drivers/gpu/drm/drm_crtc_internal.h
> > +++ b/drivers/gpu/drm/drm_crtc_internal.h
> > @@ -184,6 +184,7 @@ int drm_atomic_get_property(struct drm_mode_object *obj,
> > struct drm_property *property, uint64_t *val);
> > int drm_mode_atomic_ioctl(struct drm_device *dev,
> > void *data, struct drm_file *file_priv);
> > +int drm_atomic_remove_fb(struct drm_framebuffer *fb);
> >
> >
> > /* drm_plane.c */
> > diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> > index 588ccc3a2218..357b521bbdc3 100644
> > --- a/drivers/gpu/drm/drm_framebuffer.c
> > +++ b/drivers/gpu/drm/drm_framebuffer.c
> > @@ -773,6 +773,12 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb)
> > * in this manner.
> > */
> > if (drm_framebuffer_read_refcount(fb) > 1) {
> > + if (drm_drv_uses_atomic_modeset(dev)) {
> > + int ret = drm_atomic_remove_fb(fb);
> > + WARN(ret, "atomic remove_fb failed with %i\n", ret);
> > + goto out;
> > + }
> > +
> > drm_modeset_lock_all(dev);
> > /* remove from any CRTC */
> > drm_for_each_crtc(crtc, dev) {
> > @@ -790,6 +796,7 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb)
> > drm_modeset_unlock_all(dev);
> > }
> >
> > +out:
> > drm_framebuffer_unreference(fb);
> > }
> > EXPORT_SYMBOL(drm_framebuffer_remove);
>
> --
> Jani Nikula, Intel Open Source Technology Center
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