[Intel-gfx] [PATCH 15/23] drm: Stop updating plane->crtc/fb/old_fb on atomic drivers
Daniel Vetter
daniel at ffwll.ch
Mon Mar 26 20:52:58 UTC 2018
On Thu, Mar 22, 2018 at 05:23:05PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Stop playing around with plane->crtc/fb/old_fb with atomic
> drivers. Make life a lot simpler when we don't have to do the
> magic old_fb vs. fb dance around plane updates. That way we
> can't risk plane->fb getting out of sync with plane->state->fb
> and we're less likely to leak any refcounts as well.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> drivers/gpu/drm/drm_atomic.c | 55 ++++---------------------------------
> drivers/gpu/drm/drm_atomic_helper.c | 15 +---------
> drivers/gpu/drm/drm_crtc.c | 8 ++++--
> drivers/gpu/drm/drm_fb_helper.c | 7 -----
> drivers/gpu/drm/drm_framebuffer.c | 5 ----
> drivers/gpu/drm/drm_plane.c | 14 ++++++----
> drivers/gpu/drm/drm_plane_helper.c | 4 ++-
> include/drm/drm_atomic.h | 3 --
> 8 files changed, 24 insertions(+), 87 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 7d25c42f22db..b16cc37e2adf 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -692,6 +692,11 @@ drm_atomic_get_plane_state(struct drm_atomic_state *state,
>
> WARN_ON(!state->acquire_ctx);
>
> + /* the legacy pointers should never be set */
> + WARN_ON(plane->fb);
> + WARN_ON(plane->old_fb);
> + WARN_ON(plane->crtc);
I did already review all the users for plane->crtc and found:
armada + shmob: not atomic, should be fine
But there's also exynos, msm/mdp5, sti and vc4 doing various silly things
with setting plane->crtc. I think before you can add this WARN_ON we need
to clean up that cruft (it looks like 100% cargo culting, so should be
quit).
Going to think about the other patches tomorrow.
-Daniel
> +
> plane_state = drm_atomic_get_existing_plane_state(state, plane);
> if (plane_state)
> return plane_state;
> @@ -2021,45 +2026,6 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
> return ret;
> }
>
> -/**
> - * drm_atomic_clean_old_fb -- Unset old_fb pointers and set plane->fb pointers.
> - *
> - * @dev: drm device to check.
> - * @plane_mask: plane mask for planes that were updated.
> - * @ret: return value, can be -EDEADLK for a retry.
> - *
> - * Before doing an update &drm_plane.old_fb is set to &drm_plane.fb, but before
> - * dropping the locks old_fb needs to be set to NULL and plane->fb updated. This
> - * is a common operation for each atomic update, so this call is split off as a
> - * helper.
> - */
> -void drm_atomic_clean_old_fb(struct drm_device *dev,
> - unsigned plane_mask,
> - int ret)
> -{
> - struct drm_plane *plane;
> -
> - /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
> - * locks (ie. while it is still safe to deref plane->state). We
> - * need to do this here because the driver entry points cannot
> - * distinguish between legacy and atomic ioctls.
> - */
> - drm_for_each_plane_mask(plane, dev, plane_mask) {
> - if (ret == 0) {
> - struct drm_framebuffer *new_fb = plane->state->fb;
> - if (new_fb)
> - drm_framebuffer_get(new_fb);
> - plane->fb = new_fb;
> - plane->crtc = plane->state->crtc;
> -
> - if (plane->old_fb)
> - drm_framebuffer_put(plane->old_fb);
> - }
> - plane->old_fb = NULL;
> - }
> -}
> -EXPORT_SYMBOL(drm_atomic_clean_old_fb);
> -
> /**
> * DOC: explicit fencing properties
> *
> @@ -2280,9 +2246,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
> unsigned int copied_objs, copied_props;
> struct drm_atomic_state *state;
> struct drm_modeset_acquire_ctx ctx;
> - struct drm_plane *plane;
> struct drm_out_fence_state *fence_state;
> - unsigned plane_mask;
> int ret = 0;
> unsigned int i, j, num_fences;
>
> @@ -2322,7 +2286,6 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
> state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
>
> retry:
> - plane_mask = 0;
> copied_objs = 0;
> copied_props = 0;
> fence_state = NULL;
> @@ -2393,12 +2356,6 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
> copied_props++;
> }
>
> - if (obj->type == DRM_MODE_OBJECT_PLANE && count_props &&
> - !(arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)) {
> - plane = obj_to_plane(obj);
> - plane_mask |= (1 << drm_plane_index(plane));
> - plane->old_fb = plane->fb;
> - }
> drm_mode_object_put(obj);
> }
>
> @@ -2419,8 +2376,6 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
> }
>
> out:
> - drm_atomic_clean_old_fb(dev, plane_mask, ret);
> -
> complete_crtc_signaling(dev, state, fence_state, num_fences, !ret);
>
> if (ret == -EDEADLK) {
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 0e806f070d00..d42d88b97396 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -2892,7 +2892,6 @@ static int __drm_atomic_helper_disable_all(struct drm_device *dev,
> struct drm_plane *plane;
> struct drm_crtc_state *crtc_state;
> struct drm_crtc *crtc;
> - unsigned int plane_mask = 0;
> int ret, i;
>
> state = drm_atomic_state_alloc(dev);
> @@ -2935,17 +2934,10 @@ static int __drm_atomic_helper_disable_all(struct drm_device *dev,
> goto free;
>
> drm_atomic_set_fb_for_plane(plane_state, NULL);
> -
> - if (clean_old_fbs) {
> - plane->old_fb = plane->fb;
> - plane_mask |= BIT(drm_plane_index(plane));
> - }
> }
>
> ret = drm_atomic_commit(state);
> free:
> - drm_atomic_clean_old_fb(dev, plane_mask, ret);
> -
> drm_atomic_state_put(state);
> return ret;
> }
> @@ -3106,13 +3098,8 @@ int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
>
> state->acquire_ctx = ctx;
>
> - for_each_new_plane_in_state(state, plane, new_plane_state, i) {
> - WARN_ON(plane->crtc != new_plane_state->crtc);
> - WARN_ON(plane->fb != new_plane_state->fb);
> - WARN_ON(plane->old_fb);
> -
> + for_each_new_plane_in_state(state, plane, new_plane_state, i)
> state->planes[i].old_state = plane->state;
> - }
>
> for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
> state->crtcs[i].old_state = crtc->state;
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index a231dd5dce16..4e3c1a8d118a 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -474,8 +474,12 @@ static int __drm_mode_set_config_internal(struct drm_mode_set *set,
>
> ret = crtc->funcs->set_config(set, ctx);
> if (ret == 0) {
> - crtc->primary->crtc = fb ? crtc : NULL;
> - crtc->primary->fb = fb;
> + struct drm_plane *plane = crtc->primary;
> +
> + if (!plane->state) {
> + plane->crtc = fb ? crtc : NULL;
> + plane->fb = fb;
> + }
> }
>
> drm_for_each_crtc(tmp, crtc->dev) {
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 0646b108030b..5639e804a0cd 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -368,7 +368,6 @@ static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool activ
> struct drm_plane *plane;
> struct drm_atomic_state *state;
> int i, ret;
> - unsigned int plane_mask;
> struct drm_modeset_acquire_ctx ctx;
>
> drm_modeset_acquire_init(&ctx, 0);
> @@ -381,7 +380,6 @@ static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool activ
>
> state->acquire_ctx = &ctx;
> retry:
> - plane_mask = 0;
> drm_for_each_plane(plane, dev) {
> plane_state = drm_atomic_get_plane_state(state, plane);
> if (IS_ERR(plane_state)) {
> @@ -391,9 +389,6 @@ static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool activ
>
> plane_state->rotation = DRM_MODE_ROTATE_0;
>
> - plane->old_fb = plane->fb;
> - plane_mask |= 1 << drm_plane_index(plane);
> -
> /* disable non-primary: */
> if (plane->type == DRM_PLANE_TYPE_PRIMARY)
> continue;
> @@ -430,8 +425,6 @@ static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool activ
> ret = drm_atomic_commit(state);
>
> out_state:
> - drm_atomic_clean_old_fb(dev, plane_mask, ret);
> -
> if (ret == -EDEADLK)
> goto backoff;
>
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index ad67203de715..421a77c2a4ac 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -835,8 +835,6 @@ static int atomic_remove_fb(struct drm_framebuffer *fb)
> goto unlock;
>
> plane_mask |= BIT(drm_plane_index(plane));
> -
> - plane->old_fb = plane->fb;
> }
>
> /* This list is only filled when disable_crtcs is set. */
> @@ -851,9 +849,6 @@ static int atomic_remove_fb(struct drm_framebuffer *fb)
> ret = drm_atomic_commit(state);
>
> unlock:
> - if (plane_mask)
> - drm_atomic_clean_old_fb(dev, plane_mask, ret);
> -
> if (ret == -EDEADLK) {
> drm_atomic_state_clear(state);
> drm_modeset_backoff(&ctx);
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index 035054455301..143041666096 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -650,9 +650,11 @@ static int __setplane_internal(struct drm_plane *plane,
> crtc_x, crtc_y, crtc_w, crtc_h,
> src_x, src_y, src_w, src_h, ctx);
> if (!ret) {
> - plane->crtc = crtc;
> - plane->fb = fb;
> - drm_framebuffer_get(plane->fb);
> + if (!plane->state) {
> + plane->crtc = crtc;
> + plane->fb = fb;
> + drm_framebuffer_get(plane->fb);
> + }
> } else {
> plane->old_fb = NULL;
> }
> @@ -1092,8 +1094,10 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
> /* Keep the old fb, don't unref it. */
> plane->old_fb = NULL;
> } else {
> - plane->fb = fb;
> - drm_framebuffer_get(fb);
> + if (!plane->state) {
> + plane->fb = fb;
> + drm_framebuffer_get(fb);
> + }
> }
>
> out:
> diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
> index f88f68161519..2010794943bc 100644
> --- a/drivers/gpu/drm/drm_plane_helper.c
> +++ b/drivers/gpu/drm/drm_plane_helper.c
> @@ -502,6 +502,7 @@ EXPORT_SYMBOL(drm_plane_helper_update);
> int drm_plane_helper_disable(struct drm_plane *plane)
> {
> struct drm_plane_state *plane_state;
> + struct drm_framebuffer *old_fb;
>
> /* crtc helpers love to call disable functions for already disabled hw
> * functions. So cope with that. */
> @@ -521,8 +522,9 @@ int drm_plane_helper_disable(struct drm_plane *plane)
> plane_state->plane = plane;
>
> plane_state->crtc = NULL;
> + old_fb = plane_state->fb;
> drm_atomic_set_fb_for_plane(plane_state, NULL);
>
> - return drm_plane_helper_commit(plane, plane_state, plane->fb);
> + return drm_plane_helper_commit(plane, plane_state, old_fb);
> }
> EXPORT_SYMBOL(drm_plane_helper_disable);
> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index a57a8aa90ffb..ca461b6cf71f 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -601,9 +601,6 @@ int __must_check
> drm_atomic_add_affected_planes(struct drm_atomic_state *state,
> struct drm_crtc *crtc);
>
> -void
> -drm_atomic_clean_old_fb(struct drm_device *dev, unsigned plane_mask, int ret);
> -
> int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
> int __must_check drm_atomic_commit(struct drm_atomic_state *state);
> int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);
> --
> 2.16.1
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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