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SubjectRe: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state
Hi Daniel,

On Mon, May 13, 2019 at 04:47:47PM +0200, Daniel Vetter wrote:
> On Sat, May 11, 2019 at 10:12:02PM +0300, Laurent Pinchart wrote:
> > On Thu, May 02, 2019 at 03:49:46PM -0400, Sean Paul wrote:
> >> From: Sean Paul <seanpaul@chromium.org>
> >>
> >> Everyone who implements connector_helper_funcs->atomic_check reaches
> >> into the connector state to get the atomic state. Instead of continuing
> >> this pattern, change the callback signature to just give atomic state
> >> and let the driver determine what it does and does not need from it.
> >>
> >> Eventually all atomic functions should do this, but that's just too much
> >> busy work for me.
> >
> > Given that drivers also access the connector state, isn't this slightly
> > more inefficient ?
>
> It's atomic code, we're trying to optimize for clean code at the expense
> of a bit of runtime overhead due to more pointer chasing. And I agree with
> the general push, the pile of old/new_state pointers of various objects
> we're passing around is confusing. Passing the overall drm_atomic_state
> seems much more reasonable, and with that we can get everything else. Plus
> it's much more obvious whether you have the old/new state (since that's
> explicit when you look it up from the drm_atomic_state).

Yes, I agree it's cleaner. I just hope the atomic state tracking cost
can be kept under control :-)

By the way, this is likely not going to happen as it would be way too
intrusive, but it would be nice to rename drm_atomic_state to
drm_atomic_transaction (or something similar). It doesn't model a state,
but a change between an old state to a new state. This confused me in
the past, and I'm sure it can still be confusing to newcomers.

> If we ever see this show up in profile, and it starts mattering, first
> thing we need is a hashtable I think (atm it's list walking, which is just
> terrible). But thus far no one cares.
>
> >> Changes in v3:
> >> - Added to the set
> >>
> >> Cc: Daniel Vetter <daniel@ffwll.ch>
> >> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> >> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> >> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> >> Cc: Ben Skeggs <bskeggs@redhat.com>
> >> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >> Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> >> Cc: Eric Anholt <eric@anholt.net>
> >> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> >> ---
> >> drivers/gpu/drm/drm_atomic_helper.c | 4 ++--
> >> drivers/gpu/drm/i915/intel_atomic.c | 8 +++++---
> >> drivers/gpu/drm/i915/intel_dp_mst.c | 7 ++++---
> >> drivers/gpu/drm/i915/intel_drv.h | 2 +-
> >> drivers/gpu/drm/i915/intel_sdvo.c | 9 +++++----
> >> drivers/gpu/drm/i915/intel_tv.c | 8 +++++---
> >> drivers/gpu/drm/nouveau/dispnv50/disp.c | 5 +++--
> >> drivers/gpu/drm/rcar-du/rcar_lvds.c | 12 +++++++-----
> >> drivers/gpu/drm/vc4/vc4_txp.c | 7 ++++---
> >> include/drm/drm_modeset_helper_vtables.h | 2 +-
> >> 10 files changed, 37 insertions(+), 27 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> >> index 9d9e47276839..fa5a367507c1 100644
> >> --- a/drivers/gpu/drm/drm_atomic_helper.c
> >> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> >> @@ -683,7 +683,7 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
> >> }
> >>
> >> if (funcs->atomic_check)
> >> - ret = funcs->atomic_check(connector, new_connector_state);
> >> + ret = funcs->atomic_check(connector, state);
> >> if (ret)
> >> return ret;
> >>
> >> @@ -725,7 +725,7 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
> >> continue;
> >>
> >> if (funcs->atomic_check)
> >> - ret = funcs->atomic_check(connector, new_connector_state);
> >> + ret = funcs->atomic_check(connector, state);
> >> if (ret)
> >> return ret;
> >> }
> >> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
> >> index b844e8840c6f..e8a5b82e9242 100644
> >> --- a/drivers/gpu/drm/i915/intel_atomic.c
> >> +++ b/drivers/gpu/drm/i915/intel_atomic.c
> >> @@ -103,12 +103,14 @@ int intel_digital_connector_atomic_set_property(struct drm_connector *connector,
> >> }
> >>
> >> int intel_digital_connector_atomic_check(struct drm_connector *conn,
> >> - struct drm_connector_state *new_state)
> >> + struct drm_atomic_state *state)
> >> {
> >> + struct drm_connector_state *new_state =
> >> + drm_atomic_get_new_connector_state(state, conn);
> >> struct intel_digital_connector_state *new_conn_state =
> >> to_intel_digital_connector_state(new_state);
> >> struct drm_connector_state *old_state =
> >> - drm_atomic_get_old_connector_state(new_state->state, conn);
> >> + drm_atomic_get_old_connector_state(state, conn);
> >> struct intel_digital_connector_state *old_conn_state =
> >> to_intel_digital_connector_state(old_state);
> >> struct drm_crtc_state *crtc_state;
> >> @@ -118,7 +120,7 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
> >> if (!new_state->crtc)
> >> return 0;
> >>
> >> - crtc_state = drm_atomic_get_new_crtc_state(new_state->state, new_state->crtc);
> >> + crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);
> >>
> >> /*
> >> * These properties are handled by fastset, and might not end
> >> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> >> index 19d81cef2ab6..89cfec128ba0 100644
> >> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> >> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> >> @@ -143,9 +143,10 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
> >>
> >> static int
> >> intel_dp_mst_atomic_check(struct drm_connector *connector,
> >> - struct drm_connector_state *new_conn_state)
> >> + struct drm_atomic_state *state)
> >> {
> >> - struct drm_atomic_state *state = new_conn_state->state;
> >> + struct drm_connector_state *new_conn_state =
> >> + drm_atomic_get_new_connector_state(state, connector);
> >> struct drm_connector_state *old_conn_state =
> >> drm_atomic_get_old_connector_state(state, connector);
> >> struct intel_connector *intel_connector =
> >> @@ -155,7 +156,7 @@ intel_dp_mst_atomic_check(struct drm_connector *connector,
> >> struct drm_dp_mst_topology_mgr *mgr;
> >> int ret;
> >>
> >> - ret = intel_digital_connector_atomic_check(connector, new_conn_state);
> >> + ret = intel_digital_connector_atomic_check(connector, state);
> >> if (ret)
> >> return ret;
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> >> index f8c7b291fdc3..88571b8e8d62 100644
> >> --- a/drivers/gpu/drm/i915/intel_drv.h
> >> +++ b/drivers/gpu/drm/i915/intel_drv.h
> >> @@ -2481,7 +2481,7 @@ int intel_digital_connector_atomic_set_property(struct drm_connector *connector,
> >> struct drm_property *property,
> >> u64 val);
> >> int intel_digital_connector_atomic_check(struct drm_connector *conn,
> >> - struct drm_connector_state *new_state);
> >> + struct drm_atomic_state *state);
> >> struct drm_connector_state *
> >> intel_digital_connector_duplicate_state(struct drm_connector *connector);
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
> >> index 68f497493d43..72ea164b971c 100644
> >> --- a/drivers/gpu/drm/i915/intel_sdvo.c
> >> +++ b/drivers/gpu/drm/i915/intel_sdvo.c
> >> @@ -2342,9 +2342,10 @@ static const struct drm_connector_funcs intel_sdvo_connector_funcs = {
> >> };
> >>
> >> static int intel_sdvo_atomic_check(struct drm_connector *conn,
> >> - struct drm_connector_state *new_conn_state)
> >> + struct drm_atomic_state *state)
> >> {
> >> - struct drm_atomic_state *state = new_conn_state->state;
> >> + struct drm_connector_state *new_conn_state =
> >> + drm_atomic_get_new_connector_state(state, conn);
> >> struct drm_connector_state *old_conn_state =
> >> drm_atomic_get_old_connector_state(state, conn);
> >> struct intel_sdvo_connector_state *old_state =
> >> @@ -2356,13 +2357,13 @@ static int intel_sdvo_atomic_check(struct drm_connector *conn,
> >> (memcmp(&old_state->tv, &new_state->tv, sizeof(old_state->tv)) ||
> >> memcmp(&old_conn_state->tv, &new_conn_state->tv, sizeof(old_conn_state->tv)))) {
> >> struct drm_crtc_state *crtc_state =
> >> - drm_atomic_get_new_crtc_state(new_conn_state->state,
> >> + drm_atomic_get_new_crtc_state(state,
> >> new_conn_state->crtc);
> >>
> >> crtc_state->connectors_changed = true;
> >> }
> >>
> >> - return intel_digital_connector_atomic_check(conn, new_conn_state);
> >> + return intel_digital_connector_atomic_check(conn, state);
> >> }
> >>
> >> static const struct drm_connector_helper_funcs intel_sdvo_connector_helper_funcs = {
> >> diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
> >> index 3924c4944e1f..a41c5b467c14 100644
> >> --- a/drivers/gpu/drm/i915/intel_tv.c
> >> +++ b/drivers/gpu/drm/i915/intel_tv.c
> >> @@ -1817,16 +1817,18 @@ static const struct drm_connector_funcs intel_tv_connector_funcs = {
> >> };
> >>
> >> static int intel_tv_atomic_check(struct drm_connector *connector,
> >> - struct drm_connector_state *new_state)
> >> + struct drm_atomic_state *state)
> >> {
> >> + struct drm_connector_state *new_state;
> >> struct drm_crtc_state *new_crtc_state;
> >> struct drm_connector_state *old_state;
> >>
> >> + new_state = drm_atomic_get_new_connector_state(state, connector);
> >> if (!new_state->crtc)
> >> return 0;
> >>
> >> - old_state = drm_atomic_get_old_connector_state(new_state->state, connector);
> >> - new_crtc_state = drm_atomic_get_new_crtc_state(new_state->state, new_state->crtc);
> >> + old_state = drm_atomic_get_old_connector_state(state, connector);
> >> + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);
> >>
> >> if (old_state->tv.mode != new_state->tv.mode ||
> >> old_state->tv.margins.left != new_state->tv.margins.left ||
> >> diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> >> index 4b1650f51955..7ba373f493b2 100644
> >> --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> >> +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> >> @@ -948,11 +948,12 @@ nv50_mstc_get_modes(struct drm_connector *connector)
> >>
> >> static int
> >> nv50_mstc_atomic_check(struct drm_connector *connector,
> >> - struct drm_connector_state *new_conn_state)
> >> + struct drm_atomic_state *state)
> >> {
> >> - struct drm_atomic_state *state = new_conn_state->state;
> >> struct nv50_mstc *mstc = nv50_mstc(connector);
> >> struct drm_dp_mst_topology_mgr *mgr = &mstc->mstm->mgr;
> >> + struct drm_connector_state *new_conn_state =
> >> + drm_atomic_get_new_connector_state(state, connector);
> >> struct drm_connector_state *old_conn_state =
> >> drm_atomic_get_old_connector_state(state, connector);
> >> struct drm_crtc_state *crtc_state;
> >> diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> >> index 620b51aab291..5b81ba2a7f27 100644
> >> --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
> >> +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> >> @@ -92,13 +92,15 @@ static int rcar_lvds_connector_get_modes(struct drm_connector *connector)
> >> }
> >>
> >> static int rcar_lvds_connector_atomic_check(struct drm_connector *connector,
> >> - struct drm_connector_state *state)
> >> + struct drm_atomic_state *state)
> >> {
> >> struct rcar_lvds *lvds = connector_to_rcar_lvds(connector);
> >> const struct drm_display_mode *panel_mode;
> >> + struct drm_connector_state *conn_state;
> >> struct drm_crtc_state *crtc_state;
> >>
> >> - if (!state->crtc)
> >> + conn_state = drm_atomic_get_new_connector_state(state, connector);
> >> + if (!conn_state->crtc)
> >> return 0;
> >>
> >> if (list_empty(&connector->modes)) {
> >> @@ -110,9 +112,9 @@ static int rcar_lvds_connector_atomic_check(struct drm_connector *connector,
> >> struct drm_display_mode, head);
> >>
> >> /* We're not allowed to modify the resolution. */
> >> - crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
> >> - if (IS_ERR(crtc_state))
> >> - return PTR_ERR(crtc_state);
> >> + crtc_state = drm_atomic_get_crtc_state(state, conn_state->crtc);
> >> + if (!crtc_state)
> >> + return -EINVAL;
> >>
> >> if (crtc_state->mode.hdisplay != panel_mode->hdisplay ||
> >> crtc_state->mode.vdisplay != panel_mode->vdisplay)
> >> diff --git a/drivers/gpu/drm/vc4/vc4_txp.c b/drivers/gpu/drm/vc4/vc4_txp.c
> >> index c8b89a78f9f4..96f91c1b4b6e 100644
> >> --- a/drivers/gpu/drm/vc4/vc4_txp.c
> >> +++ b/drivers/gpu/drm/vc4/vc4_txp.c
> >> @@ -221,17 +221,18 @@ static const u32 txp_fmts[] = {
> >> };
> >>
> >> static int vc4_txp_connector_atomic_check(struct drm_connector *conn,
> >> - struct drm_connector_state *conn_state)
> >> + struct drm_atomic_state *state)
> >> {
> >> + struct drm_connector_state *conn_state;
> >> struct drm_crtc_state *crtc_state;
> >> struct drm_framebuffer *fb;
> >> int i;
> >>
> >> + conn_state = drm_atomic_get_new_connector_state(state, conn);
> >> if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
> >> return 0;
> >>
> >> - crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
> >> - conn_state->crtc);
> >> + crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
> >>
> >> fb = conn_state->writeback_job->fb;
> >> if (fb->width != crtc_state->mode.hdisplay ||
> >> diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
> >> index de57fb40cb6e..adc8b7cf64b5 100644
> >> --- a/include/drm/drm_modeset_helper_vtables.h
> >> +++ b/include/drm/drm_modeset_helper_vtables.h
> >> @@ -1020,7 +1020,7 @@ struct drm_connector_helper_funcs {
> >> * deadlock.
> >> */
> >> int (*atomic_check)(struct drm_connector *connector,
> >> - struct drm_connector_state *state);
> >> + struct drm_atomic_state *state);
> >>
> >> /**
> >> * @atomic_commit:

--
Regards,

Laurent Pinchart

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