From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Cc: hao.wu@intel.com, yilun.xu@intel.com, russell.h.weight@intel.com,
basheer.ahmed.muddebihal@intel.com, trix@redhat.com,
mdf@kernel.org, linux-fpga@vger.kernel.org,
linux-doc@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
tianfei.zhang@intel.com, corbet@lwn.net,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-serial <linux-serial@vger.kernel.org>,
Jiri Slaby <jirislaby@kernel.org>,
geert+renesas@glider.be,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
niklas.soderlund+renesas@ragnatech.se, macro@orcam.me.uk,
johan@kernel.org, Lukas Wunner <lukas@wunner.de>,
marpagan@redhat.com
Subject: Re: [PATCH v4 1/4] Documentation: fpga: dfl: Add documentation for DFHv1
Date: Fri, 21 Oct 2022 11:36:10 +0300 (EEST) [thread overview]
Message-ID: <9511e1f-f927-7c45-1ab8-90587f9c91e4@linux.intel.com> (raw)
In-Reply-To: <d265dae0-fe4b-8ac0-fb9e-2a7345b279a2@linux.intel.com>
[-- Attachment #1: Type: text/plain, Size: 7284 bytes --]
On Fri, 21 Oct 2022, Ilpo Järvinen wrote:
> On Thu, 20 Oct 2022, matthew.gerlach@linux.intel.com wrote:
>
> > From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> >
> > Add documentation describing the extensions provided by Version
> > 1 of the Device Feature Header (DFHv1).
> >
> > Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> > ---
> > v4: Remove marketing speak and separate v0 and v1 descriptions.
> > Fix errors reported by "make htmldocs".
> >
> > v3: no change
> >
> > v2: s/GUILD/GUID/
> > add picture
> > ---
> > Documentation/fpga/dfl.rst | 96 ++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 96 insertions(+)
> >
> > diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
> > index 15b670926084..12365be435a8 100644
> > --- a/Documentation/fpga/dfl.rst
> > +++ b/Documentation/fpga/dfl.rst
> > @@ -561,6 +561,102 @@ new DFL feature via UIO direct access, its feature id should be added to the
> > driver's id_table.
> >
> >
> > +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
> > +===========================================
>
> While this is structurally better than the previous one. I'd still include
> at least one paragraph about the purpose. Something along these lines
> (picked from v3 + edited the marketing speak/v0 compare away from it):
>
> Version 1 of the Device Feature Header (DFHv1) provides flexibility and
> extensibility to hardware designs using Device Feature Lists. It is a
> standardized mechanism for features to describe parameters/capabilities to
> software.
>
> With DFHv1:
> * GUID is mandatory for all types
> * The register space of the feature is decoupled from the location of the DFH
> * A list of parameter values associates to a particular feature.
>
> After that, the header itself makes much more sense already.
>
> > +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
>
> Should this mention it's addr/offs of registers? As is it's bit hard to
> figure out from the diagram w/o the extra description. I think you have
> plenty of space for adding that extra bit of info.
>
> > + +-----------------------------------------------------------------------+
> > + |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|
Copy-paste error on the next field.
--
i.
> > + +-----------------------------------------------------------------------+
> > + |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.
>
> A copy-paste error?
>
> > +
> > +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.
>
> I'd reverse the order and say "ID and version" (kind of major thing
> first).
>
> > +
> > Open discussion
> > ===============
> > FME driver exports one ioctl (DFL_FPGA_FME_PORT_PR) for partial reconfiguration
> >
>
>
next prev parent reply other threads:[~2022-10-21 8:37 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-20 21:26 [PATCH v4 0/4] Enhance definition of DFH and use enhancements for uart driver matthew.gerlach
2022-10-20 21:26 ` [PATCH v4 1/4] Documentation: fpga: dfl: Add documentation for DFHv1 matthew.gerlach
2022-10-21 3:55 ` Bagas Sanjaya
2022-10-24 15:01 ` matthew.gerlach
2022-10-21 8:28 ` Ilpo Järvinen
2022-10-21 8:36 ` Ilpo Järvinen [this message]
2022-10-20 21:26 ` [PATCH v4 2/4] fpga: dfl: Add DFHv1 Register Definitions matthew.gerlach
2022-10-21 8:06 ` Ilpo Järvinen
2022-10-24 15:03 ` matthew.gerlach
2022-10-20 21:26 ` [PATCH v4 3/4] fpga: dfl: add basic support DFHv1 matthew.gerlach
2022-10-20 22:07 ` Andy Shevchenko
2022-10-24 14:56 ` matthew.gerlach
2022-10-21 8:58 ` Ilpo Järvinen
2022-10-24 15:09 ` matthew.gerlach
2022-10-21 9:07 ` Ilpo Järvinen
2022-10-29 13:08 ` Xu Yilun
2022-10-29 14:47 ` matthew.gerlach
2022-11-01 22:37 ` matthew.gerlach
2022-11-03 1:36 ` Xu Yilun
2022-10-30 22:06 ` Andy Shevchenko
2022-10-31 1:16 ` Xu Yilun
2022-10-31 15:34 ` Andy Shevchenko
2022-10-31 20:15 ` matthew.gerlach
2022-11-01 1:55 ` Xu Yilun
2022-10-20 21:26 ` [PATCH v4 4/4] tty: serial: 8250: add DFL bus driver for Altera 16550 matthew.gerlach
2022-10-20 22:13 ` Andy Shevchenko
2022-10-21 4:33 ` Greg KH
2022-10-21 9:24 ` Ilpo Järvinen
2022-10-29 15:24 ` Xu Yilun
2022-11-01 0:34 ` matthew.gerlach
2022-11-01 1:46 ` Xu Yilun
2022-11-01 16:04 ` matthew.gerlach
2022-11-01 16:30 ` Ilpo Järvinen
2022-11-01 17:39 ` matthew.gerlach
2022-11-02 9:57 ` Ilpo Järvinen
2022-11-08 12:48 ` Marco Pagani
2022-11-08 12:51 ` Ilpo Järvinen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=9511e1f-f927-7c45-1ab8-90587f9c91e4@linux.intel.com \
--to=ilpo.jarvinen@linux.intel.com \
--cc=andriy.shevchenko@linux.intel.com \
--cc=basheer.ahmed.muddebihal@intel.com \
--cc=corbet@lwn.net \
--cc=geert+renesas@glider.be \
--cc=gregkh@linuxfoundation.org \
--cc=hao.wu@intel.com \
--cc=jirislaby@kernel.org \
--cc=johan@kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-fpga@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=lukas@wunner.de \
--cc=macro@orcam.me.uk \
--cc=marpagan@redhat.com \
--cc=matthew.gerlach@linux.intel.com \
--cc=mdf@kernel.org \
--cc=niklas.soderlund+renesas@ragnatech.se \
--cc=russell.h.weight@intel.com \
--cc=tianfei.zhang@intel.com \
--cc=trix@redhat.com \
--cc=yilun.xu@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).