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

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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




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