2023 X.Org Foundation Election vote results
The Board of Directors election and the vote on the By-laws concluded at 14:00 UTC on May 1st 2023 and these are the results: - We had 75 members this year, of which 55 cast a vote, so the turnout is 73.3%. - On the question "Do you accept the proposed By-Law changes to make SFC the new fiscal sponsor of the X.Org foundation, replacing SPI?" 52 of the 55 members voted yes (94.5%). Among all 75 members, approval is 69.3% (52/75, over 2/3), so we can consider this change approved using the current by-law rules. - On the question "Do you accept the proposed By-Law changes to modify the special voting quorum requirements to be limited to present (meaning voting) members?" 48 of the 55 members voted yes (87.3%). Despite this, 48 votes represent only 64% of the members, which means the by-laws change does not pass. - In the election of the Directors to the Board of the X.Org Foundation, the results were that Daniel Vetter, Lyude Paul, Arkadiusz Hiler and Christopher Michael were elected for two-year terms. The old full board is: Emma Anholt, Mark Filion, Ricardo Garcia, Samuel Iglesias Gonsálvez, Manasi D Navare, Lyude Paul, Alyssa Rosenzweig and Daniel Vetter. The new full board is: Emma Anholt, Mark Filion, Ricardo Garcia, Arkadiusz Hiler, Christopher Michael, Lyude Paul, Alyssa Rosenzweig and Daniel Vetter. Full election results, sorted by points: * Daniel Vetter (367 points) * Lyude Paul (348 points) * Arkadiusz Hiler (286 points) * Christopher Michael (263 points) * Manasi Navare (195 points) * Uma Shankar (157 points) * Thomas Adam (105 points) * William Weeks-Balconi (51 points) Thanks everyone, -Ricardo Garcia, on behalf of the X.Org elections committee
[RFC] Plane color pipeline KMS uAPI
Hi all,
The goal of this RFC is to expose a generic KMS uAPI to configure the color
pipeline before blending, ie. after a pixel is tapped from a plane's
framebuffer and before it's blended with other planes. With this new uAPI we
aim to reduce the battery life impact of color management and HDR on mobile
devices, to improve performance and to decrease latency by skipping
composition on the 3D engine. This proposal is the result of discussions at
the Red Hat HDR hackfest [1] which took place a few days ago. Engineers
familiar with the AMD, Intel and NVIDIA hardware have participated in the
discussion.
This proposal takes a prescriptive approach instead of a descriptive approach.
Drivers describe the available hardware blocks in terms of low-level
mathematical operations, then user-space configures each block. We decided
against a descriptive approach where user-space would provide a high-level
description of the colorspace and other parameters: we want to give more
control and flexibility to user-space, e.g. to be able to replicate exactly the
color pipeline with shaders and switch between shaders and KMS pipelines
seamlessly, and to avoid forcing user-space into a particular color management
policy.
We've decided against mirroring the existing CRTC properties
DEGAMMA_LUT/CTM/GAMMA_LUT onto KMS planes. Indeed, the color management
pipeline can significantly differ between vendors and this approach cannot
accurately abstract all hardware. In particular, the availability, ordering and
capabilities of hardware blocks is different on each display engine. So, we've
decided to go for a highly detailed hardware capability discovery.
This new uAPI should not be in conflict with existing standard KMS properties,
since there are none which control the pre-blending color pipeline at the
moment. It does conflict with any vendor-specific properties like
NV_INPUT_COLORSPACE or the patches on the mailing list adding AMD-specific
properties. Drivers will need to either reject atomic commits configuring both
uAPIs, or alternatively we could add a DRM client cap which hides the vendor
properties and shows the new generic properties when enabled.
To use this uAPI, first user-space needs to discover hardware capabilities via
KMS objects and properties, then user-space can configure the hardware via an
atomic commit. This works similarly to the existing KMS uAPI, e.g. planes.
Our proposal introduces a new "color_pipeline" plane property, and a new KMS
object type, "COLOROP" (short for color operation). The "color_pipeline" plane
property is an enum, each enum entry represents a color pipeline supported by
the hardware. The special zero entry indicates that the pipeline is in
"bypass"/"no-op" mode. For instance, the following plane properties describe a
primary plane with 2 supported pipelines but currently configured in bypass
mode:
Plane 10
├─ "type": immutable enum {Overlay, Primary, Cursor} = Primary
├─ …
└─ "color_pipeline": enum {0, 42, 52} = 0
The non-zero entries describe color pipelines as a linked list of COLOROP KMS
objects. The entry value is an object ID pointing to the head of the linked
list (the first operation in the color pipeline).
The new COLOROP objects also expose a number of KMS properties. Each has a
type, a reference to the next COLOROP object in the linked list, and other
type-specific properties. Here is an example for a 1D LUT operation:
Color operation 42
├─ "type": enum {Bypass, 1D curve} = 1D curve
├─ "1d_curve_type": enum {LUT, sRGB, PQ, BT.709, HLG, …} = LUT
├─ "lut_size": immutable range = 4096
├─ "lut_data": blob
└─ "next": immutable color operation ID = 43
To configure this hardware block, user-space can fill a KMS blob with 4096 u32
entries, then set "lut_data" to the blob ID. Other color operation types might
have different properties.
Here is another example with a 3D LUT:
Color operation 42
├─ "type": enum {Bypass, 3D LUT} = 3D LUT
├─ "lut_size": immutable range = 33
├─ "lut_data": blob
└─ "next": immutable color operation ID = 43
And one last example with a matrix:
Color operation 42
├─ "type": enum {Bypass, Matrix} = Matrix
├─ "matrix_data": blob
└─ "next": immutable color operation ID = 43
[Simon note: having "Bypass" in the "type" enum, and making "type" mutable is
a bit weird. Maybe we can just add an "active"/"bypass" boolean property on
blocks which can be bypassed instead.]
[Jonas note: perhaps a single "data" property for both LUTs and matrices
would make more sense. And a "size" prop for both 1D and 3D LUTs.]
If some hardware supports re-ordering operations in the color pipeline, the
driver can expose multiple pipelines with different operation ordering, and
user-space can pick the ordering it prefers by selecting the right pipeline.
The same scheme can be used to expose hardware blocks supporting multiple
precision levels.
That's pretty much all there is to it, but as always the devil
Re: [RFC] Plane color pipeline KMS uAPI
On 5/4/23 11:22, Simon Ser wrote:
Hi all,
The goal of this RFC is to expose a generic KMS uAPI to configure the color
pipeline before blending, ie. after a pixel is tapped from a plane's
framebuffer and before it's blended with other planes. With this new uAPI we
aim to reduce the battery life impact of color management and HDR on mobile
devices, to improve performance and to decrease latency by skipping
composition on the 3D engine. This proposal is the result of discussions at
the Red Hat HDR hackfest [1] which took place a few days ago. Engineers
familiar with the AMD, Intel and NVIDIA hardware have participated in the
discussion.
Thanks for typing this up. It does a great job describing the vision.
This proposal takes a prescriptive approach instead of a descriptive approach.
Drivers describe the available hardware blocks in terms of low-level
mathematical operations, then user-space configures each block. We decided
against a descriptive approach where user-space would provide a high-level
description of the colorspace and other parameters: we want to give more
control and flexibility to user-space, e.g. to be able to replicate exactly the
color pipeline with shaders and switch between shaders and KMS pipelines
seamlessly, and to avoid forcing user-space into a particular color management
policy.
We've decided against mirroring the existing CRTC properties
DEGAMMA_LUT/CTM/GAMMA_LUT onto KMS planes. Indeed, the color management
pipeline can significantly differ between vendors and this approach cannot
accurately abstract all hardware. In particular, the availability, ordering and
capabilities of hardware blocks is different on each display engine. So, we've
decided to go for a highly detailed hardware capability discovery.
This new uAPI should not be in conflict with existing standard KMS properties,
since there are none which control the pre-blending color pipeline at the
moment. It does conflict with any vendor-specific properties like
NV_INPUT_COLORSPACE or the patches on the mailing list adding AMD-specific
properties. Drivers will need to either reject atomic commits configuring both
uAPIs, or alternatively we could add a DRM client cap which hides the vendor
properties and shows the new generic properties when enabled.
To use this uAPI, first user-space needs to discover hardware capabilities via
KMS objects and properties, then user-space can configure the hardware via an
atomic commit. This works similarly to the existing KMS uAPI, e.g. planes.
Our proposal introduces a new "color_pipeline" plane property, and a new KMS
object type, "COLOROP" (short for color operation). The "color_pipeline" plane
property is an enum, each enum entry represents a color pipeline supported by
the hardware. The special zero entry indicates that the pipeline is in
"bypass"/"no-op" mode. For instance, the following plane properties describe a
primary plane with 2 supported pipelines but currently configured in bypass
mode:
Plane 10
├─ "type": immutable enum {Overlay, Primary, Cursor} = Primary
├─ …
└─ "color_pipeline": enum {0, 42, 52} = 0
The non-zero entries describe color pipelines as a linked list of COLOROP KMS
objects. The entry value is an object ID pointing to the head of the linked
list (the first operation in the color pipeline).
The new COLOROP objects also expose a number of KMS properties. Each has a
type, a reference to the next COLOROP object in the linked list, and other
type-specific properties. Here is an example for a 1D LUT operation:
Color operation 42
├─ "type": enum {Bypass, 1D curve} = 1D curve
├─ "1d_curve_type": enum {LUT, sRGB, PQ, BT.709, HLG, …} = LUT
├─ "lut_size": immutable range = 4096
├─ "lut_data": blob
└─ "next": immutable color operation ID = 43
To configure this hardware block, user-space can fill a KMS blob with 4096 u32
entries, then set "lut_data" to the blob ID. Other color operation types might
have different properties.
Here is another example with a 3D LUT:
Color operation 42
├─ "type": enum {Bypass, 3D LUT} = 3D LUT
├─ "lut_size": immutable range = 33
├─ "lut_data": blob
└─ "next": immutable color operation ID = 43
And one last example with a matrix:
Color operation 42
├─ "type": enum {Bypass, Matrix} = Matrix
├─ "matrix_data": blob
└─ "next": immutable color operation ID = 43
[Simon note: having "Bypass" in the "type" enum, and making "type" mutable is
a bit weird. Maybe we can just add an "active"/"bypass" boolean property on
blocks which can be bypassed instead.]
I would favor a "bypass" boolean property.
[Jonas note: perhaps a single "data" property for both LUTs and matrices
would make more sense. And a "size" prop for both 1D and 3D LUTs.]
I concur. We'll probably want to document for which types a property
applies.
If some hardware supports re-ordering operations in the color pipeline, the
driver can expose multiple pipelines with diff
