[PATCH v3 1/2] drm: Introduce plane SIZE_HINTS property
Ville Syrjala
ville.syrjala at linux.intel.com
Mon Mar 13 16:33:11 UTC 2023
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Add a new immutable plane property by which a plane can advertise
a handful of recommended plane sizes. This would be mostly exposed
by cursor planes as a slightly more capable replacement for
the DRM_CAP_CURSOR_WIDTH/HEIGHT caps, which can only declare
a one size fits all limit for the whole device.
Currently eg. amdgpu/i915/nouveau just advertize the max cursor
size via the cursor size caps. But always using the max sized
cursor can waste a surprising amount of power, so a better
stragey is desirable.
Most other drivers don't specify any cursor size at all, in
which case the ioctl code just claims that 64x64 is a great
choice. Whether that is actually true is debatable.
A poll of various compositor developers informs us that
blindly probing with setcursor/atomic ioctl to determine
suitable cursor sizes is not acceptable, thus the
introduction of the new property to supplant the cursor
size caps. The compositor will now be free to select a
more optimal cursor size from the short list of options.
Note that the reported sizes (either via the property or the
caps) make no claims about things such as plane scaling. So
these things should only really be consulted for simple
"cursor like" use cases.
v2: Try to add some docs
v3: Specify that value 0 is reserved for future use (basic idea from Jonas)
Drop the note about typical hardware (Pekka)
Cc: Simon Ser <contact at emersion.fr>
Cc: Jonas Ådahl <jadahl at redhat.com>
Cc: Daniel Stone <daniel at fooishbar.org>
Cc: Pekka Paalanen <pekka.paalanen at collabora.com>
Acked-by: Harry Wentland <harry.wentland at amd.com>
Acked-by: Pekka Paalanen <pekka.paalanen at collabora.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/drm_mode_config.c | 7 ++++
drivers/gpu/drm/drm_plane.c | 53 +++++++++++++++++++++++++++++++
include/drm/drm_mode_config.h | 5 +++
include/drm/drm_plane.h | 4 +++
include/uapi/drm/drm_mode.h | 11 +++++++
5 files changed, 80 insertions(+)
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index 87eb591fe9b5..21860f94a18c 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -374,6 +374,13 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
return -ENOMEM;
dev->mode_config.modifiers_property = prop;
+ prop = drm_property_create(dev,
+ DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
+ "SIZE_HINTS", 0);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.size_hints_property = prop;
+
return 0;
}
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 24e7998d1731..d2a6fdff1a57 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -140,6 +140,26 @@
* DRM_FORMAT_MOD_LINEAR. Before linux kernel release v5.1 there have been
* various bugs in this area with inconsistencies between the capability
* flag and per-plane properties.
+ *
+ * SIZE_HINTS:
+ * Blob property which contains the set of recommended plane size
+ * which can used for simple "cursor like" use cases (eg. no scaling).
+ * Using these hints frees userspace from extensive probing of
+ * supported plane sizes through atomic/setcursor ioctls.
+ *
+ * For optimal usage userspace should pick the smallest size
+ * that satisfies its own requirements.
+ *
+ * The blob contains an array of struct drm_plane_size_hint.
+ *
+ * Drivers should only attach this property to planes that
+ * support a very limited set of sizes.
+ *
+ * Note that property value 0 (ie. no blob) is reserved for potential
+ * future use. Current userspace is expected to ignore the property
+ * if the value is 0, and fall back to some other means (eg.
+ * &DRM_CAP_CURSOR_WIDTH and &DRM_CAP_CURSOR_HEIGHT) to determine
+ * the appropriate plane size to use.
*/
static unsigned int drm_num_planes(struct drm_device *dev)
@@ -1582,3 +1602,36 @@ int drm_plane_create_scaling_filter_property(struct drm_plane *plane,
return 0;
}
EXPORT_SYMBOL(drm_plane_create_scaling_filter_property);
+
+/**
+ * drm_plane_add_size_hint_property - create a size hint property
+ *
+ * @plane: drm plane
+ * @hints: size hints
+ * @num_hints: number of size hints
+ *
+ * Create a size hints property for the plane.
+ *
+ * RETURNS:
+ * Zero for success or -errno
+ */
+int drm_plane_add_size_hints_property(struct drm_plane *plane,
+ const struct drm_plane_size_hint *hints,
+ int num_hints)
+{
+ struct drm_device *dev = plane->dev;
+ struct drm_mode_config *config = &dev->mode_config;
+ struct drm_property_blob *blob;
+
+ blob = drm_property_create_blob(dev,
+ array_size(sizeof(hints[0]), num_hints),
+ hints);
+ if (IS_ERR(blob))
+ return PTR_ERR(blob);
+
+ drm_object_attach_property(&plane->base, config->size_hints_property,
+ blob->base.id);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_plane_add_size_hints_property);
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index e5b053001d22..5bc8aed9b445 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -949,6 +949,11 @@ struct drm_mode_config {
*/
struct drm_property *modifiers_property;
+ /**
+ * @size_hints_propertty: Plane SIZE_HINTS property.
+ */
+ struct drm_property *size_hints_property;
+
/* cursor size */
uint32_t cursor_width, cursor_height;
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 51291983ea44..1997d7d64b69 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -32,6 +32,7 @@
#include <drm/drm_util.h>
struct drm_crtc;
+struct drm_plane_size_hint;
struct drm_printer;
struct drm_modeset_acquire_ctx;
@@ -945,5 +946,8 @@ drm_plane_get_damage_clips(const struct drm_plane_state *state);
int drm_plane_create_scaling_filter_property(struct drm_plane *plane,
unsigned int supported_filters);
+int drm_plane_add_size_hints_property(struct drm_plane *plane,
+ const struct drm_plane_size_hint *hints,
+ int num_hints);
#endif
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 46becedf5b2f..9d7c5967264f 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -849,6 +849,17 @@ struct drm_color_lut {
__u16 reserved;
};
+/**
+ * struct drm_plane_size_hint - Plane size hints
+ *
+ * The plane SIZE_HINTS property blob contains an
+ * array of struct drm_plane_size_hint.
+ */
+struct drm_plane_size_hint {
+ __u16 width;
+ __u16 height;
+};
+
/**
* struct hdr_metadata_infoframe - HDR Metadata Infoframe Data.
*
--
2.39.2
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