From 0e26cc72c71cb98e951716a6596060cd04b0ba6b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Almeida?= <andrealmeid@igalia.com>
Date: Wed, 22 Nov 2023 13:19:38 -0300
Subject: [PATCH] drm: Refuse to async flip with atomic prop changes
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Given that prop changes may lead to modesetting, which would defeat the
fast path of the async flip, refuse any atomic prop change for async
flips in atomic API. The only exception is the framebuffer ID to flip
to. Currently the only plane type supported is the primary one.
Signed-off-by: André Almeida <andrealmeid@igalia.com>
Reviewed-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patchwork.freedesktop.org/patch/msgid/20231122161941.320564-2-andrealmeid@igalia.com
---
drivers/gpu/drm/drm_atomic_uapi.c | 52 +++++++++++++++++++++++++++--
drivers/gpu/drm/drm_crtc_internal.h | 2 +-
drivers/gpu/drm/drm_mode_object.c | 2 +-
3 files changed, 51 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 98d3b10c08ae1..52494642b095c 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -1006,13 +1006,28 @@ int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
return ret;
}
+static int drm_atomic_check_prop_changes(int ret, uint64_t old_val, uint64_t prop_value,
+ struct drm_property *prop)
+{
+ if (ret != 0 || old_val != prop_value) {
+ drm_dbg_atomic(prop->dev,
+ "[PROP:%d:%s] No prop can be changed during async flip\n",
+ prop->base.id, prop->name);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
int drm_atomic_set_property(struct drm_atomic_state *state,
struct drm_file *file_priv,
struct drm_mode_object *obj,
struct drm_property *prop,
- uint64_t prop_value)
+ u64 prop_value,
+ bool async_flip)
{
struct drm_mode_object *ref;
+ u64 old_val;
int ret;
if (!drm_property_change_valid_get(prop, prop_value, &ref))
@@ -1029,6 +1044,13 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
break;
}
+ if (async_flip) {
+ ret = drm_atomic_connector_get_property(connector, connector_state,
+ prop, &old_val);
+ ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
+ break;
+ }
+
ret = drm_atomic_connector_set_property(connector,
connector_state, file_priv,
prop, prop_value);
@@ -1044,6 +1066,13 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
break;
}
+ if (async_flip) {
+ ret = drm_atomic_crtc_get_property(crtc, crtc_state,
+ prop, &old_val);
+ ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
+ break;
+ }
+
ret = drm_atomic_crtc_set_property(crtc,
crtc_state, prop, prop_value);
break;
@@ -1051,6 +1080,7 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
case DRM_MODE_OBJECT_PLANE: {
struct drm_plane *plane = obj_to_plane(obj);
struct drm_plane_state *plane_state;
+ struct drm_mode_config *config = &plane->dev->mode_config;
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state)) {
@@ -1058,6 +1088,21 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
break;
}
+ if (async_flip && prop != config->prop_fb_id) {
+ ret = drm_atomic_plane_get_property(plane, plane_state,
+ prop, &old_val);
+ ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
+ break;
+ }
+
+ if (async_flip && plane_state->plane->type != DRM_PLANE_TYPE_PRIMARY) {
+ drm_dbg_atomic(prop->dev,
+ "[OBJECT:%d] Only primary planes can be changed during async flip\n",
+ obj->id);
+ ret = -EINVAL;
+ break;
+ }
+
ret = drm_atomic_plane_set_property(plane,
plane_state, file_priv,
prop, prop_value);
@@ -1337,6 +1382,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
struct drm_out_fence_state *fence_state;
int ret = 0;
unsigned int i, j, num_fences;
+ bool async_flip = false;
/* disallow for drivers not supporting atomic: */
if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
@@ -1450,8 +1496,8 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
goto out;
}
- ret = drm_atomic_set_property(state, file_priv,
- obj, prop, prop_value);
+ ret = drm_atomic_set_property(state, file_priv, obj,
+ prop, prop_value, async_flip);
if (ret) {
drm_mode_object_put(obj);
goto out;
diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index 6b646e0783be9..a514d5207e419 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -253,7 +253,7 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
struct drm_file *file_priv,
struct drm_mode_object *obj,
struct drm_property *prop,
- uint64_t prop_value);
+ u64 prop_value, bool async_flip);
int drm_atomic_get_property(struct drm_mode_object *obj,
struct drm_property *property, uint64_t *val);
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
index ac0d2ce3f8704..0e8355063eee3 100644
--- a/drivers/gpu/drm/drm_mode_object.c
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -538,7 +538,7 @@ static int set_property_atomic(struct drm_mode_object *obj,
obj_to_connector(obj),
prop_value);
} else {
- ret = drm_atomic_set_property(state, file_priv, obj, prop, prop_value);
+ ret = drm_atomic_set_property(state, file_priv, obj, prop, prop_value, false);
if (ret)
goto out;
ret = drm_atomic_commit(state);
--
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