On Tue, Nov 19, 2019 at 11:14:43AM +0100, Daniel Vetter wrote:
> On Fri, Nov 15, 2019 at 09:42:00PM +0200, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >
> > Yank out the code for the plane->fb/old_fb/crtc handling from
> > the page flip path into page_flip_internal(), and provide a
> > simpler variant for atomic drivers.
> >
> > We'll also move the fb vs. src viewport checks into the new
> > functions as they are slightly different between the two paths.
> > If the atomic .page_flip() implementations are guaranteed
> > to call drm_atomic_plane_check() we could even drop the check
> > entirely from page_flip_atomic(). For now toss in a FIXME.
> >
> > v2: Bit more polish in page_flip_internal()
> >
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/drm_plane.c | 159 +++++++++++++++++++++++-------------
> > 1 file changed, 102 insertions(+), 57 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> > index 38878da5b704..6052475a20a5 100644
> > --- a/drivers/gpu/drm/drm_plane.c
> > +++ b/drivers/gpu/drm/drm_plane.c
> > @@ -1031,13 +1031,109 @@ int drm_mode_cursor2_ioctl(struct drm_device *dev,
> > return drm_mode_cursor_common(dev, req, file_priv);
> > }
> >
> > +static int page_flip_check_fbs(const struct drm_framebuffer *fb,
> > + const struct drm_framebuffer *old_fb)
> > +{
> > + /* The framebuffer is currently unbound, presumably
> > + * due to a hotplug event, that userspace has not
> > + * yet discovered.
> > + */
> > + if (!old_fb)
> > + return -EBUSY;
> > +
> > + if (old_fb->format != fb->format) {
> > + DRM_DEBUG_KMS("Page flip is not allowed to change frame buffer format.\n");
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int page_flip_internal(struct drm_crtc *crtc,
> > + struct drm_framebuffer *fb,
> > + struct drm_pending_vblank_event *e,
> > + u32 flags,
> > + u32 target_vblank,
> > + struct drm_modeset_acquire_ctx *ctx)
> > +{
> > + struct drm_plane *plane = crtc->primary;
> > + int ret;
> > +
> > + WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
> > +
> > + ret = drm_crtc_check_viewport(crtc, crtc->x, crtc->y,
> > + &crtc->mode, fb);
> > + if (ret)
> > + return ret;
> > +
> > + ret = page_flip_check_fbs(fb, plane->fb);
> > + if (ret)
> > + return ret;
> > +
> > + plane->old_fb = plane->fb;
> > + if (crtc->funcs->page_flip_target)
> > + ret = crtc->funcs->page_flip_target(crtc, fb, e, flags,
> > + target_vblank, ctx);
> > + else
> > + ret = crtc->funcs->page_flip(crtc, fb, e, flags, ctx);
> > + if (ret) {
> > + plane->old_fb = NULL;
> > + return ret;
> > + }
> > +
> > + plane->fb = fb;
> > + drm_framebuffer_get(plane->fb);
> > +
> > + drm_framebuffer_put(plane->old_fb);
> > + plane->old_fb = NULL;
> > +
> > + return 0;
> > +}
> > +
> > +static int page_flip_atomic(struct drm_crtc *crtc,
> > + struct drm_framebuffer *fb,
> > + struct drm_pending_vblank_event *e,
> > + u32 flags,
> > + u32 target_vblank,
> > + struct drm_modeset_acquire_ctx *ctx)
> > +{
> > + struct drm_plane *plane = crtc->primary;
> > + struct drm_plane_state *plane_state = plane->state;
> > + int ret;
> > +
> > + WARN_ON(!drm_drv_uses_atomic_modeset(crtc->dev));
> > +
> > + /*
> > + * FIXME: Can we assume all drivers end up calling
> > + * drm_atomic_plane_check() in their page flip paths?
> > + * If so we could remove this.
> > + */
>
> This is definitely wrong, core has to check these. Currently no driver
> checks this at all. I think you're thinking of
> drm_atomic_helper_check_plane_state().
No, I'm thinking of drm_atomic_plane_check(). That one already does the
"does the src rect fit into the fb" check. It gets called from
drm_atomic_commit()->drm_atomic_check_only() but I wasn't sure if some
drivers might take some short circuit path past that for page_flip().
>
> That aside I'm kinda not getting the point of the shuffling/cleanup in the
> first 4 patches here, so will skip them.
The point was to get that legacy plane->fb/old_fb stuff totally
out from the atomic codepath. Right now it's polluting the
supposedly higher level code shared by both atomic and legacy
drivers.
> -Daniel
>
> > + ret = drm_framebuffer_check_src_coords(plane_state->src_x,
> > + plane_state->src_y,
> > + plane_state->src_w,
> > + plane_state->src_h,
> > + fb);
> > + if (ret)
> > + return ret;
> > +
> > + ret = page_flip_check_fbs(fb, plane_state->fb);
> > + if (ret)
> > + return ret;
> > +
> > + if (crtc->funcs->page_flip_target)
> > + return crtc->funcs->page_flip_target(crtc, fb, e, flags,
> > + target_vblank, ctx);
> > + else
> > + return crtc->funcs->page_flip(crtc, fb, e, flags, ctx);
> > +}
> > +
> > int drm_mode_page_flip_ioctl(struct drm_device *dev,
> > void *data, struct drm_file *file_priv)
> > {
> > struct drm_mode_crtc_page_flip_target *page_flip = data;
> > struct drm_crtc *crtc;
> > struct drm_plane *plane;
> > - struct drm_framebuffer *fb, *old_fb;
> > + struct drm_framebuffer *fb;
> > struct drm_pending_vblank_event *e = NULL;
> > u32 target_vblank = page_flip->sequence;
> > struct drm_modeset_acquire_ctx ctx;
> > @@ -1145,65 +1241,14 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
> > if (ret)
> > goto out;
> >
> > - if (plane->state)
> > - old_fb = plane->state->fb;
> > + if (drm_drv_uses_atomic_modeset(dev))
> > + ret = page_flip_atomic(crtc, fb, e, page_flip->flags,
> > + target_vblank, &ctx);
> > else
> > - old_fb = plane->fb;
> > -
> > - if (old_fb == NULL) {
> > - /* The framebuffer is currently unbound, presumably
> > - * due to a hotplug event, that userspace has not
> > - * yet discovered.
> > - */
> > - ret = -EBUSY;
> > - goto out;
> > - }
> > -
> > - if (plane->state) {
> > - const struct drm_plane_state *state = plane->state;
> > -
> > - ret = drm_framebuffer_check_src_coords(state->src_x,
> > - state->src_y,
> > - state->src_w,
> > - state->src_h,
> > - fb);
> > - } else {
> > - ret = drm_crtc_check_viewport(crtc, crtc->x, crtc->y,
> > - &crtc->mode, fb);
> > - }
> > - if (ret)
> > - goto out;
> > -
> > - if (old_fb->format != fb->format) {
> > - DRM_DEBUG_KMS("Page flip is not allowed to change frame buffer format.\n");
> > - ret = -EINVAL;
> > - goto out;
> > - }
> > -
> > - plane->old_fb = plane->fb;
> > - if (crtc->funcs->page_flip_target)
> > - ret = crtc->funcs->page_flip_target(crtc, fb, e,
> > - page_flip->flags,
> > - target_vblank,
> > - &ctx);
> > - else
> > - ret = crtc->funcs->page_flip(crtc, fb, e, page_flip->flags,
> > - &ctx);
> > - if (ret) {
> > - /* Keep the old fb, don't unref it. */
> > - plane->old_fb = NULL;
> > - } else {
> > - if (!plane->state) {
> > - plane->fb = fb;
> > - drm_framebuffer_get(fb);
> > - }
> > - }
> > + ret = page_flip_internal(crtc, fb, e, page_flip->flags,
> > + target_vblank, &ctx);
> >
> > out:
> > - if (plane->old_fb)
> > - drm_framebuffer_put(plane->old_fb);
> > - plane->old_fb = NULL;
> > -
> > if (ret == -EDEADLK) {
> > ret = drm_modeset_backoff(&ctx);
> > if (!ret)
> > --
> > 2.23.0
> >
> > _______________________________________________
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> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
--
Ville Syrjälä
Intel
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