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

matthew.gerlach
2022-10-24T16:23:11Z

On Fri, 21 Oct 2022, Bagas Sanjaya wrote:

> On Thu, Oct 20, 2022 at 02:26:07PM -0700, matthew.gerlach@linux.intel.com 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
>