2019-05-02 19:51:53

by Sean Paul

Subject: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

From: Sean Paul <[email protected]>

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.

Changes in v3:
- Added to the set

Cc: Daniel Vetter <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Kieran Bingham <[email protected]>
Cc: Eric Anholt <[email protected]>
Signed-off-by: Sean Paul <[email protected]>
---
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:
--
Sean Paul, Software Engineer, Google / Chromium OS

2019-05-03 08:22:09

by Daniel Vetter

Subject: Re: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

On Thu, May 02, 2019 at 03:49:46PM -0400, Sean Paul wrote:
> From: Sean Paul <[email protected]>
>
> 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.
>
> Changes in v3:
> - Added to the set
>
> Cc: Daniel Vetter <[email protected]>
> Cc: Ville Syrj?l? <[email protected]>
> Cc: Jani Nikula <[email protected]>
> Cc: Joonas Lahtinen <[email protected]>
> Cc: Rodrigo Vivi <[email protected]>
> Cc: Ben Skeggs <[email protected]>
> Cc: Laurent Pinchart <[email protected]>
> Cc: Kieran Bingham <[email protected]>
> Cc: Eric Anholt <[email protected]>
> Signed-off-by: Sean Paul <[email protected]>

Assuming it compiles everywhere and intel-gfx-ci approves too

Acked-by: Daniel Vetter <[email protected]>
> ---
> 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:
> --
> Sean Paul, Software Engineer, Google / Chromium OS
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

2019-05-11 19:13:28

by Laurent Pinchart

Subject: Re: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

Hi Sean,

Thank you for the patch.

On Thu, May 02, 2019 at 03:49:46PM -0400, Sean Paul wrote:
> From: Sean Paul <[email protected]>
>
> 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 ?

> Changes in v3:
> - Added to the set
>
> Cc: Daniel Vetter <[email protected]>
> Cc: Ville Syrjälä <[email protected]>
> Cc: Jani Nikula <[email protected]>
> Cc: Joonas Lahtinen <[email protected]>
> Cc: Rodrigo Vivi <[email protected]>
> Cc: Ben Skeggs <[email protected]>
> Cc: Laurent Pinchart <[email protected]>
> Cc: Kieran Bingham <[email protected]>
> Cc: Eric Anholt <[email protected]>
> Signed-off-by: Sean Paul <[email protected]>
> ---
> 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

2019-05-13 16:16:43

by Daniel Vetter

Subject: Re: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

On Sat, May 11, 2019 at 10:12:02PM +0300, Laurent Pinchart wrote:
> Hi Sean,
>
> Thank you for the patch.
>
> On Thu, May 02, 2019 at 03:49:46PM -0400, Sean Paul wrote:
> > From: Sean Paul <[email protected]>
> >
> > 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).

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.
-Daniel

>
> > Changes in v3:
> > - Added to the set
> >
> > Cc: Daniel Vetter <[email protected]>
> > Cc: Ville Syrj?l? <[email protected]>
> > Cc: Jani Nikula <[email protected]>
> > Cc: Joonas Lahtinen <[email protected]>
> > Cc: Rodrigo Vivi <[email protected]>
> > Cc: Ben Skeggs <[email protected]>
> > Cc: Laurent Pinchart <[email protected]>
> > Cc: Kieran Bingham <[email protected]>
> > Cc: Eric Anholt <[email protected]>
> > Signed-off-by: Sean Paul <[email protected]>
> > ---
> > 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

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

2019-05-13 17:41:45

by Sean Paul

Subject: Re: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

On Sat, May 11, 2019 at 3:12 PM Laurent Pinchart
<[email protected]> wrote:
>
> Hi Sean,
>
> Thank you for the patch.
>

Hey Laurent,
Thanks for looking!


> On Thu, May 02, 2019 at 03:49:46PM -0400, Sean Paul wrote:
> > From: Sean Paul <[email protected]>
> >
> > 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 ?
>

Inefficient in terms of what?

Agree that in isolation this patch might seem unnecessary, but it ties
in with the encoder and bridge CLs which accept drm_atomic_state in
their hooks. In general the idea is to convert all atomic functions to
take overall atomic state instead of just their object state. Reality
has proven to be more complicated and we need more access than what
the current implementation provides.

Sean

> > Changes in v3:
> > - Added to the set
> >
> > Cc: Daniel Vetter <[email protected]>
> > Cc: Ville Syrjälä <[email protected]>
> > Cc: Jani Nikula <[email protected]>
> > Cc: Joonas Lahtinen <[email protected]>
> > Cc: Rodrigo Vivi <[email protected]>
> > Cc: Ben Skeggs <[email protected]>
> > Cc: Laurent Pinchart <[email protected]>
> > Cc: Kieran Bingham <[email protected]>
> > Cc: Eric Anholt <[email protected]>
> > Signed-off-by: Sean Paul <[email protected]>
> > ---
> > 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

2019-05-16 12:04:02

by Laurent Pinchart

Subject: Re: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

Hi Sean,

On Mon, May 13, 2019 at 10:38:58AM -0400, Sean Paul wrote:
> On Sat, May 11, 2019 at 3:12 PM Laurent Pinchart wrote:
> > On Thu, May 02, 2019 at 03:49:46PM -0400, Sean Paul wrote:
> >> From: Sean Paul <[email protected]>
> >>
> >> 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 ?
>
> Inefficient in terms of what?

In terms of the operation having to lookup the connector state, when the
caller has it and can easily pass it. As Daniel commented, this may be
the price to pay for a cleaner API, but I wonder how much overhead all
the state tracking is costing.

> Agree that in isolation this patch might seem unnecessary, but it ties
> in with the encoder and bridge CLs which accept drm_atomic_state in

CLs ?

> their hooks. In general the idea is to convert all atomic functions to
> take overall atomic state instead of just their object state. Reality
> has proven to be more complicated and we need more access than what
> the current implementation provides.
>
> Sean
>
> >> Changes in v3:
> >> - Added to the set
> >>
> >> Cc: Daniel Vetter <[email protected]>
> >> Cc: Ville Syrjälä <[email protected]>
> >> Cc: Jani Nikula <[email protected]>
> >> Cc: Joonas Lahtinen <[email protected]>
> >> Cc: Rodrigo Vivi <[email protected]>
> >> Cc: Ben Skeggs <[email protected]>
> >> Cc: Laurent Pinchart <[email protected]>
> >> Cc: Kieran Bingham <[email protected]>
> >> Cc: Eric Anholt <[email protected]>
> >> Signed-off-by: Sean Paul <[email protected]>
> >> ---
> >> 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

2019-05-16 12:06:05

by Laurent Pinchart

Subject: Re: [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 <[email protected]>
> >>
> >> 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 <[email protected]>
> >> Cc: Ville Syrjälä <[email protected]>
> >> Cc: Jani Nikula <[email protected]>
> >> Cc: Joonas Lahtinen <[email protected]>
> >> Cc: Rodrigo Vivi <[email protected]>
> >> Cc: Ben Skeggs <[email protected]>
> >> Cc: Laurent Pinchart <[email protected]>
> >> Cc: Kieran Bingham <[email protected]>
> >> Cc: Eric Anholt <[email protected]>
> >> Signed-off-by: Sean Paul <[email protected]>
> >> ---
> >> 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

2019-05-16 12:09:20

by Daniel Vetter

Subject: Re: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

On Thu, May 16, 2019 at 2:02 PM Laurent Pinchart
<[email protected]> wrote:
>
> 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 <[email protected]>
> > >>
> > >> 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.

Why are you the first to suggest this, this is awesome!
drm_atomic_state is indeed not a state, but a transaction representing
how we go from the old to the new state.

I think this is awesome enough that we should actually try to make it
happen. Tree-wide cocci + bribing Dave on St. Patrick's day with lots
of beer might be enough :-)
-Daniel

> > 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 <[email protected]>
> > >> Cc: Ville Syrjälä <[email protected]>
> > >> Cc: Jani Nikula <[email protected]>
> > >> Cc: Joonas Lahtinen <[email protected]>
> > >> Cc: Rodrigo Vivi <[email protected]>
> > >> Cc: Ben Skeggs <[email protected]>
> > >> Cc: Laurent Pinchart <[email protected]>
> > >> Cc: Kieran Bingham <[email protected]>
> > >> Cc: Eric Anholt <[email protected]>
> > >> Signed-off-by: Sean Paul <[email protected]>
> > >> ---
> > >> 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
> _______________________________________________
> dri-devel mailing list
> [email protected]
> https://lists.freedesktop.org/mailman/listinfo/dri-devel



--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

2019-05-16 13:31:05

by Ville Syrjälä

Subject: Re: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

On Thu, May 16, 2019 at 02:07:34PM +0200, Daniel Vetter wrote:
> On Thu, May 16, 2019 at 2:02 PM Laurent Pinchart
> <[email protected]> wrote:
> >
> > 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 <[email protected]>
> > > >>
> > > >> 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.
>
> Why are you the first to suggest this, this is awesome!

Can't quite tell if that's irony or not. Anyways, this has been
suggested before but no volunteers stepped forward.

> drm_atomic_state is indeed not a state, but a transaction representing
> how we go from the old to the new state.

On a semi-related topic, I've occasionally pondered about moving
mode_changed & co. from the obj states to the top level
state/transaction (maybe stored as a bitmask). But that would
definitely not be a trivial sed job.

--
Ville Syrj?l?
Intel

2019-05-16 14:24:26

by Sean Paul

Subject: Re: [PATCH v3 04/10] drm: Convert connector_helper_funcs->atomic_check to accept drm_atomic_state

On Thu, May 16, 2019 at 03:00:01PM +0300, Laurent Pinchart wrote:
> Hi Sean,
>
> On Mon, May 13, 2019 at 10:38:58AM -0400, Sean Paul wrote:
> > On Sat, May 11, 2019 at 3:12 PM Laurent Pinchart wrote:
> > > On Thu, May 02, 2019 at 03:49:46PM -0400, Sean Paul wrote:
> > >> From: Sean Paul <[email protected]>
> > >>
> > >> 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 ?
> >
> > Inefficient in terms of what?
>
> In terms of the operation having to lookup the connector state, when the
> caller has it and can easily pass it. As Daniel commented, this may be
> the price to pay for a cleaner API, but I wonder how much overhead all
> the state tracking is costing.
>

It'd be interesting to quantify, but iirc the last time we benchmarked
atomic check commits they were virtually free (~thousands/s).

> > Agree that in isolation this patch might seem unnecessary, but it ties
> > in with the encoder and bridge CLs which accept drm_atomic_state in
>
> CLs ?

Googleism for patches, I usually catch these before sending... guess I missed
one.

Sean

>
> > their hooks. In general the idea is to convert all atomic functions to
> > take overall atomic state instead of just their object state. Reality
> > has proven to be more complicated and we need more access than what
> > the current implementation provides.
> >
> > Sean
> >
> > >> Changes in v3:
> > >> - Added to the set
> > >>
> > >> Cc: Daniel Vetter <[email protected]>
> > >> Cc: Ville Syrj?l? <[email protected]>
> > >> Cc: Jani Nikula <[email protected]>
> > >> Cc: Joonas Lahtinen <[email protected]>
> > >> Cc: Rodrigo Vivi <[email protected]>
> > >> Cc: Ben Skeggs <[email protected]>
> > >> Cc: Laurent Pinchart <[email protected]>
> > >> Cc: Kieran Bingham <[email protected]>
> > >> Cc: Eric Anholt <[email protected]>
> > >> Signed-off-by: Sean Paul <[email protected]>
> > >> ---
> > >> 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

--
Sean Paul, Software Engineer, Google / Chromium OS