[PATCH v2 2/3] drm: Create a format/modifier blob
Ben Widawsky
ben at bwidawsk.net
Tue May 16 21:31:25 UTC 2017
Updated blob layout (Rob, Daniel, Kristian, xerpi)
v2:
* Removed __packed, and alignment (.+)
* Fix indent in drm_format_modifier fields (Liviu)
* Remove duplicated modifier > 64 check (Liviu)
* Change comment about modifier (Liviu)
* Remove arguments to blob creation, use plane instead (Liviu)
* Fix data types (Ben)
* Make the blob part of uapi (Daniel)
Cc: Rob Clark <robdclark at gmail.com>
Cc: Daniel Stone <daniels at collabora.com>
Cc: Kristian H. Kristensen <hoegsberg at gmail.com>
Cc: Liviu Dudau <liviu at dudau.co.uk>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Reviewed-by: Daniel Stone <daniels at collabora.com>
---
drivers/gpu/drm/drm_mode_config.c | 7 +++
drivers/gpu/drm/drm_plane.c | 89 +++++++++++++++++++++++++++++++++++++++
include/drm/drm_mode_config.h | 6 +++
include/uapi/drm/drm_mode.h | 50 ++++++++++++++++++++++
4 files changed, 152 insertions(+)
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index d9862259a2a7..6bfbc3839df5 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -337,6 +337,13 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
return -ENOMEM;
dev->mode_config.gamma_lut_size_property = prop;
+ prop = drm_property_create(dev,
+ DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
+ "IN_FORMATS", 0);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.modifiers = prop;
+
return 0;
}
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 20203871e06d..f5b032b5f761 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -62,6 +62,92 @@ static unsigned int drm_num_planes(struct drm_device *dev)
return num;
}
+static inline u32 *
+formats_ptr(struct drm_format_modifier_blob *blob)
+{
+ return (u32 *)(((char *)blob) + blob->formats_offset);
+}
+
+static inline struct drm_format_modifier *
+modifiers_ptr(struct drm_format_modifier_blob *blob)
+{
+ return (struct drm_format_modifier *)(((char *)blob) + blob->modifiers_offset);
+}
+
+static int create_in_format_blob(struct drm_device *dev, struct drm_plane *plane)
+{
+ const struct drm_mode_config *config = &dev->mode_config;
+ const uint64_t *temp_modifiers = plane->modifiers;
+ unsigned int format_modifier_count = 0;
+ struct drm_property_blob *blob = NULL;
+ struct drm_format_modifier *mod;
+ size_t blob_size = 0, formats_size, modifiers_size;
+ struct drm_format_modifier_blob *blob_data;
+ int i, j, ret = 0;
+
+ if (plane->modifiers)
+ while (*temp_modifiers++ != DRM_FORMAT_MOD_INVALID)
+ format_modifier_count++;
+
+ formats_size = sizeof(*plane->format_types) * plane->format_count;
+ if (WARN_ON(!formats_size)) {
+ /* 0 formats are never expected */
+ return 0;
+ }
+
+ modifiers_size =
+ sizeof(struct drm_format_modifier) * format_modifier_count;
+
+ blob_size = sizeof(struct drm_format_modifier_blob);
+ blob_size += ALIGN(formats_size, 8);
+ blob_size += modifiers_size;
+
+ blob = drm_property_create_blob(dev, blob_size, NULL);
+ if (IS_ERR(blob))
+ return -1;
+
+ blob_data = (struct drm_format_modifier_blob *)blob->data;
+ blob_data->version = FORMAT_BLOB_CURRENT;
+ blob_data->count_formats = plane->format_count;
+ blob_data->formats_offset = sizeof(struct drm_format_modifier_blob);
+ blob_data->count_modifiers = format_modifier_count;
+
+ /* Modifiers offset is a pointer to a struct with a 64 bit field so it
+ * should be naturally aligned to 8B.
+ */
+ blob_data->modifiers_offset =
+ ALIGN(blob_data->formats_offset + formats_size, 8);
+
+ memcpy(formats_ptr(blob_data), plane->format_types, formats_size);
+
+ /* If we can't determine support, just bail */
+ if (!plane->funcs->format_mod_supported)
+ goto done;
+
+ mod = modifiers_ptr(blob_data);
+ for (i = 0; i < format_modifier_count; i++) {
+ for (j = 0; j < plane->format_count; j++) {
+ if (plane->funcs->format_mod_supported(plane,
+ plane->format_types[j],
+ plane->modifiers[i])) {
+
+ mod->formats |= 1 << j;
+ }
+ }
+
+ mod->modifier = plane->modifiers[i];
+ mod->offset = 0;
+ mod->pad = 0;
+ mod++;
+ }
+
+done:
+ drm_object_attach_property(&plane->base, config->modifiers,
+ blob->base.id);
+
+ return ret;
+}
+
/**
* drm_universal_plane_init - Initialize a new universal plane object
* @dev: DRM device
@@ -180,6 +266,9 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
drm_object_attach_property(&plane->base, config->prop_src_h, 0);
}
+ if (config->allow_fb_modifiers)
+ create_in_format_blob(dev, plane);
+
return 0;
}
EXPORT_SYMBOL(drm_universal_plane_init);
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 42981711189b..03776e659811 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -757,6 +757,12 @@ struct drm_mode_config {
*/
bool allow_fb_modifiers;
+ /**
+ * @modifiers: Plane property to list support modifier/format
+ * combination.
+ */
+ struct drm_property *modifiers;
+
/* cursor size */
uint32_t cursor_width, cursor_height;
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 8c67fc03d53d..7ad567903fdc 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -665,6 +665,56 @@ struct drm_mode_atomic {
__u64 user_data;
};
+struct drm_format_modifier_blob {
+#define FORMAT_BLOB_CURRENT 1
+ /* Version of this blob format */
+ u32 version;
+
+ /* Flags */
+ u32 flags;
+
+ /* Number of fourcc formats supported */
+ u32 count_formats;
+
+ /* Where in this blob the formats exist (in bytes) */
+ u32 formats_offset;
+
+ /* Number of drm_format_modifiers */
+ u32 count_modifiers;
+
+ /* Where in this blob the modifiers exist (in bytes) */
+ u32 modifiers_offset;
+
+ /* u32 formats[] */
+ /* struct drm_format_modifier modifiers[] */
+};
+
+struct drm_format_modifier {
+ /* Bitmask of formats in get_plane format list this info applies to. The
+ * offset allows a sliding window of which 64 formats (bits).
+ *
+ * Some examples:
+ * In today's world with < 65 formats, and formats 0, and 2 are
+ * supported
+ * 0x0000000000000005
+ * ^-offset = 0, formats = 5
+ *
+ * If the number formats grew to 128, and formats 98-102 are
+ * supported with the modifier:
+ *
+ * 0x0000003c00000000 0000000000000000
+ * ^
+ * |__offset = 64, formats = 0x3c00000000
+ *
+ */
+ __u64 formats;
+ __u32 offset;
+ __u32 pad;
+
+ /* The modifier that applies to the >get_plane format list bitmask. */
+ __u64 modifier;
+};
+
/**
* Create a new 'blob' data property, copying length bytes from data pointer,
* and returning new blob ID.
--
2.13.0
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