Re: [PATCH v4 1/4] Documentation: fpga: dfl: Add documentation for DFHv1

[matthew . gerlach]

On Fri, 21 Oct 2022, Bagas Sanjaya wrote:

> On Thu, Oct 20, 2022 at 02:26:07PM -0700, matthew.gerlach@xxxxxxxxxxxxxxx wrote:
> > +Device Feature Header - Version 0
> > +===========================================
> > +The format of Version 0 of a Device Feature Header (DFH) is shown below::
> > +
> > +    +-----------------------------------------------------------------------+
> > +    |63 Type 60|59 DFH VER 52|51 Rsvd 41|40 EOL|39 Next 16|15 VER 12|11 ID 0| 0x00
> > +    +-----------------------------------------------------------------------+
> > +    |63                                 GUID_L                             0| 0x08
> > +    +-----------------------------------------------------------------------+
> > +    |63                                 GUID_H                             0| 0x10
> > +    +-----------------------------------------------------------------------+
> > +
> > +Offset 0x00
> > +Type - The type of DFH (e.g. FME, AFU, or private feature).
> > +DFH VER - The version of the DFH.
> > +Rsvd - Currently unused.
> > +EOL - Set if this DFH is the end of the Device Feature List (DFL).
> > +Next - The offset of the next DFH in the DFL from the start of the DFH.
> > +If EOL is set, Next refers to size of mmio for last feature in the list.
> > +ID - If Type field is 'private feature', then ID of the private feature.
> > +
> > +Offset 0x08
> > +GUID_L - Least significant 64 bits of a 128 bit Globally Unique Identifier
> > +if Type is FME or AFU.
> > +
> > +Offset 0x10
> > +GUID_H - Most significant 64 bits of a 128 bit Globally Unique Identifier
> > +if Type is FME or AFU.
> > +
> > +
> > +Device Feature Header - Version 1
> > +===========================================
> > +The format of Version 1 of a Device Feature Header (DFH) is shown below::
> > +
> > +    +-----------------------------------------------------------------------+
> > +    |63 Type 60|59 DFH VER 52|51 Rsvd 41|40 EOL|39 Next 16|15 VER 12|11 ID 0| 0x00
> > +    +-----------------------------------------------------------------------+
> > +    |63                                 GUID_L                             0| 0x08
> > +    +-----------------------------------------------------------------------+
> > +    |63                                 GUID_H                             0| 0x10
> > +    +-----------------------------------------------------------------------+
> > +    |63                 Address/Offset                            1|  Rel  0| 0x18
> > +    +-----------------------------------------------------------------------+
> > +    |63        Reg Size       32|Params 31|30 Group    16|15 Instance      0| 0x20
> > +    +-----------------------------------------------------------------------+
> > +    |63 Next      34|RSV33|EOP32|31 Param Version 16|15 Param ID           0| 0x28
> > +    +-----------------------------------------------------------------------+
> > +    |63                 Parameter Data                                     0| 0x30
> > +    +-----------------------------------------------------------------------+
> > +
> > +                                  ...
> > +
> > +    +-----------------------------------------------------------------------+
> > +    |63 Next parameter offset 32|31 Param Version 16|15 Param ID           0|
> > +    +-----------------------------------------------------------------------+
> > +    |63                 Parameter Data                                     0|
> > +    +-----------------------------------------------------------------------+
> > +
> > +Offset 0x00
> > +Type - The type of DFH (e.g. FME, AFU, or private feature).
> > +DFH VER - The version of the DFH.
> > +Rsvd - Currently unused.
> > +EOL - Set if this DFH is the end of the Device Feature List (DFL).
> > +Next - The offset of the next DFH in the DFL from the start of the DFH.
> > +If EOL is set, Next refers to size of mmio for last feature in the list.
> > +ID - If Type field is 'private feature', then ID of the private feature.
> > +
> > +Offset 0x08
> > +GUID_L - Least significant 64 bits of a 128 bit Globally Unique Identifier.
> > +
> > +Offset 0x10
> > +GUID_H - Most significant 64 bits of a 128 bit Globally Unique Identifier
> > +if Type is FME or AFU.
> > +
> > +Offset 0x18
> > +Address/Offset - If Rel bit is set, then high 63 bits of a 16 bit aligned
> > +absolute address for the location of the feature's registers.
> > +If Rel bit is clear, then the feature's registers start at the
> > +offset from the start of the DFH.
> > +
> > +Offset 0x20
> > +Reg Size - Size of feature's register set.
> > +Params - Set if DFH has one or more parameter blocks.
> > +Group - Id of group if feature is part of a group.
> > +Instance - Id of instance of feature within a group.
> > +
> > +Offset 0x28 if feature has parameters
> > +Next - High 30 bits of a 32 bit aligned offset to the next parameter block.
> > +If EOP set, size of last parameter.
> > +Param Version - Version of Param ID.
> > +Param ID - ID of parameter.
> > +
> > +Offset 0x30
> > +Parameter Data - Parameter data whose size and format is defined by version
> > +and ID of the parameter.
> > +
>
> The offset fields list should be formatted with nested list (with
> prose improv):
>
> ---- >8 ----

Thanks for the good suggestion.

> diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
> index 12365be435a812..9c19ee62d4ac44 100644
> --- a/Documentation/fpga/dfl.rst
> +++ b/Documentation/fpga/dfl.rst
> @@ -573,22 +573,27 @@ The format of Version 0 of a Device Feature Header (DFH) is shown below::
>     |63                                 GUID_H                             0| 0x10
>     +-----------------------------------------------------------------------+
>
> -Offset 0x00
> -Type - The type of DFH (e.g. FME, AFU, or private feature).
> -DFH VER - The version of the DFH.
> -Rsvd - Currently unused.
> -EOL - Set if this DFH is the end of the Device Feature List (DFL).
> -Next - The offset of the next DFH in the DFL from the start of the DFH.
> -If EOL is set, Next refers to size of mmio for last feature in the list.
> -ID - If Type field is 'private feature', then ID of the private feature.
> +The fields are:
>
> -Offset 0x08
> -GUID_L - Least significant 64 bits of a 128 bit Globally Unique Identifier
> -if Type is FME or AFU.
> +  * Offset 0x00
>
> -Offset 0x10
> -GUID_H - Most significant 64 bits of a 128 bit Globally Unique Identifier
> -if Type is FME or AFU.
> +    * Type - The type of DFH (e.g. FME, AFU, or private feature).
> +    * DFH VER - The version of the DFH.
> +    * Rsvd - Currently unused.
> +    * EOL - Set if this DFH is the end of the Device Feature List (DFL).
> +
> +    * Next - The offset of the next DFH in the DFL from the start of the DFH.
> +      If EOL is set, Next refers to size of mmio for last feature in the list.
> +
> +    * ID - Private feature ID if Type is private feature.
> +
> +  * Offset 0x08
> +
> +    * GUID_L - Least significant half of a 128-bit GUID if Type is FME or AFU.
> +
> +  * Offset 0x10
> +
> +    * GUID_H - Most significant half of a 128-bit GUID if Type if FME or AFU.
>
>
> Device Feature Header - Version 1
> @@ -619,43 +624,53 @@ The format of Version 1 of a Device Feature Header (DFH) is shown below::
>     |63                 Parameter Data                                     0|
>     +-----------------------------------------------------------------------+
>
> -Offset 0x00
> -Type - The type of DFH (e.g. FME, AFU, or private feature).
> -DFH VER - The version of the DFH.
> -Rsvd - Currently unused.
> -EOL - Set if this DFH is the end of the Device Feature List (DFL).
> -Next - The offset of the next DFH in the DFL from the start of the DFH.
> -If EOL is set, Next refers to size of mmio for last feature in the list.
> -ID - If Type field is 'private feature', then ID of the private feature.
> +The fields are:
>
> -Offset 0x08
> -GUID_L - Least significant 64 bits of a 128 bit Globally Unique Identifier.
> +  * Offset 0x00
>
> -Offset 0x10
> -GUID_H - Most significant 64 bits of a 128 bit Globally Unique Identifier
> -if Type is FME or AFU.
> +    * Type - The type of DFH (e.g. FME, AFU, or private feature).
> +    * DFH VER - The version of the DFH.
> +    * Rsvd - Currently unused.
> +    * EOL - Set if this DFH is the end of the Device Feature List (DFL).
>
> -Offset 0x18
> -Address/Offset - If Rel bit is set, then high 63 bits of a 16 bit aligned
> -absolute address for the location of the feature's registers.
> -If Rel bit is clear, then the feature's registers start at the
> -offset from the start of the DFH.
> +    * Next - The offset of the next DFH in the DFL from the start of the DFH.
> +      If EOL is set, Next refers to size of mmio for last feature in the list.
>
> -Offset 0x20
> -Reg Size - Size of feature's register set.
> -Params - Set if DFH has one or more parameter blocks.
> -Group - Id of group if feature is part of a group.
> -Instance - Id of instance of feature within a group.
> +    * ID - Private feature ID if Type is private feature.
>
> -Offset 0x28 if feature has parameters
> -Next - High 30 bits of a 32 bit aligned offset to the next parameter block.
> -If EOP set, size of last parameter.
> -Param Version - Version of Param ID.
> -Param ID - ID of parameter.
> +  * Offset 0x08
>
> -Offset 0x30
> -Parameter Data - Parameter data whose size and format is defined by version
> -and ID of the parameter.
> +    * GUID_L - Least significant half of a 128-bit GUID if Type is FME or APU.
> +
> +  * Offset 0x10
> +
> +    * GUID_H - Most significant half of a 128-bit GUID if Type is FME or AFU.
> +
> +  * Offset 0x18
> +
> +    * Address/Offset - If Rel bit is set, upper 63 bits of a 16-bit aligned
> +      absolute address for the location of feature registers; otherwise
> +      registers of the feature start at the offset from the start of the DFH.
> +
> +  * Offset 0x20
> +
> +    * Reg Size - Size of register set of the feature.
> +    * Params - Set if DFH has one or more parameter blocks.
> +    * Group - ID of group if the feature is part of a group.
> +    * Instance - ID of instance of the feature within a group.
> +
> +  * Offset 0x28 (if the feature has parameters)
> +
> +    * Next - Upper 30 bits of a 32-bit aligned offset to the next parameter
> +      block. If EOP is set, size of last parameter.
> +
> +    * Param Version - Version of Param ID.
> +    * Param ID - ID of parameter.
> +
> +  * Offset 0x30 (if the feature has parameters)
> +
> +    * Parameter Data - Parameter data whose size and format is defined by
> +      version and ID of the parameter.
>
> Open discussion
> ===============
>
> Thanks.
>
> --
> An old man doll... just what I always wanted! - Clara