[Intel-gfx] [PATCH 2/3] drm: Create a format/modifier blob
Liviu Dudau
Liviu.Dudau at arm.com
Wed May 3 13:15:15 UTC 2017
On Tue, May 02, 2017 at 10:14:27PM -0700, Ben Widawsky wrote:
> Updated blob layout (Rob, Daniel, Kristian, xerpi)
>
> Cc: Rob Clark <robdclark at gmail.com>
> Cc: Daniel Stone <daniels at collabora.com>
> Cc: Kristian H. Kristensen <hoegsberg at gmail.com>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
> drivers/gpu/drm/drm_mode_config.c | 7 +++
> drivers/gpu/drm/drm_plane.c | 119 ++++++++++++++++++++++++++++++++++++++
> include/drm/drm_mode_config.h | 6 ++
> include/uapi/drm/drm_mode.h | 26 +++++++++
> 4 files changed, 158 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 286e183891e5..2e89e0e73435 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -62,6 +62,117 @@ static unsigned int drm_num_planes(struct drm_device *dev)
> return num;
> }
>
> +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[] */
> +} __packed;
> +
> +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_plane_funcs *funcs,
> + const uint32_t *formats, unsigned int format_count,
> + const uint64_t *format_modifiers)
Why do you have to pass the format_modifiers again when you have plane->modifiers?
Or the reverse question: why do you need plane->modifiers when you are passing the
modifiers as parameters all the time?
> +{
> + const struct drm_mode_config *config = &dev->mode_config;
> + const uint64_t *temp_modifiers = format_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 (format_modifiers)
> + while (*temp_modifiers++ != DRM_FORMAT_MOD_INVALID)
> + format_modifier_count++;
> +
> + formats_size = sizeof(__u32) * 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 = ALIGN(sizeof(struct drm_format_modifier_blob), 8);
> + 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 = 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), formats, formats_size);
> +
> + /* If we can't determine support, just bail */
> + if (!funcs->format_mod_supported)
> + goto done;
> +
> + mod = modifiers_ptr(blob_data);
> + for (i = 0; i < format_modifier_count; i++) {
> + for (j = 0; j < format_count; j++) {
> + if (funcs->format_mod_supported(plane, formats[j],
> + format_modifiers[i])) {
> + mod->formats |= 1 << j;
> + }
> + }
> +
> + mod->modifier = format_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
> @@ -130,6 +241,10 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
> return -ENOMEM;
> }
>
> + /* First driver to need more than 64 formats needs to fix this */
> + if (WARN_ON(format_count > 64))
> + return -EINVAL;
> +
Applying this patch makes the above check appear twice in drm_universal_plane_init() function.
> if (name) {
> va_list ap;
>
> @@ -177,6 +292,10 @@ 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, funcs, formats, format_count,
> + format_modifiers);
> +
> 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.
Comment says "Plane property" yet this is struct drm_mode_config.
> + */
> + 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..dcdd04c55792 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -665,6 +665,32 @@ struct drm_mode_atomic {
> __u64 user_data;
> };
>
> +struct drm_format_modifier {
> + /* Bitmask of formats in get_plane format list this info applies to. The
You have some unusual indent of the comment here. Also the file uses a different
style for multi-line comments.
> + * 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
> + *
> + */
> + uint64_t formats;
> + uint32_t offset;
> + uint32_t pad;
s/pad/__pad/ or s/pad/__reserved/ ?
> +
> + /* This modifier can be used with the format for this plane. */
I'm having trouble parsing the comment. How about: "The modifier that applies to the
get_plane format list bitmask." ?
Best regards,
Liviu
> + uint64_t modifier;
> +} __packed;
> +
> /**
> * Create a new 'blob' data property, copying length bytes from data pointer,
> * and returning new blob ID.
> --
> 2.12.2
>
> _______________________________________________
> dri-devel mailing list
> dri-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
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