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Date: Tue, 20 Mar 2018 14:46:59 +0800
From: Wu Hao <hao.wu@...el.com>
To: Alan Tull <atull@...nel.org>
Cc: Moritz Fischer <mdf@...nel.org>, linux-fpga@...r.kernel.org,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-api@...r.kernel.org, "Kang, Luwei" <luwei.kang@...el.com>,
"Zhang, Yi Z" <yi.z.zhang@...el.com>,
Tim Whisonant <tim.whisonant@...el.com>,
Enno Luebbers <enno.luebbers@...el.com>,
Shiva Rao <shiva.rao@...el.com>,
Christopher Rauer <christopher.rauer@...el.com>,
Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: Re: [PATCH v4 12/24] fpga: dfl: fme: add
FPGA_GET_API_VERSION/CHECK_EXTENSION ioctls support
On Mon, Mar 19, 2018 at 01:29:52PM -0500, Alan Tull wrote:
> On Tue, Feb 13, 2018 at 3:24 AM, Wu Hao <hao.wu@...el.com> wrote:
>
> Hi Hao,
>
> Looking at fpga-dfl.h again, there's a lot of things that start with
> FPGA_. Don't you think this is too general? There are other FPGA_
> things in the kernel. Not just the things added by this patch, but
> the whole file.
Hi Alan
Thanks for the comments, I got your point here. FPGA_ things should be
reserved for more generic things for FPGA. I will search and replace
the FPGA_xxx things used here and in other files.
>
> > FPGA_GET_API_VERSION and FPGA_CHECK_EXTENSION ioctls are common ones which
>
> Maybe DFL_FPGA_GET_API_VERSION?
Yes, DFL_FPGA_GET_API_VERSION looks good.
>
> > need to be supported by all feature devices drivers including FME and AFU.
> > Userspace application can use these ioctl interfaces to get the API info
> > and check if specific extension is supported or not in current driver.
> >
> > This patch implements above 2 ioctls in FPGA Management Engine (FME)
> > driver.
> >
> > Signed-off-by: Tim Whisonant <tim.whisonant@...el.com>
> > Signed-off-by: Enno Luebbers <enno.luebbers@...el.com>
> > Signed-off-by: Shiva Rao <shiva.rao@...el.com>
> > Signed-off-by: Christopher Rauer <christopher.rauer@...el.com>
> > Signed-off-by: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> > Signed-off-by: Wu Hao <hao.wu@...el.com>
> > Acked-by: Alan Tull <atull@...nel.org>
> > Acked-by: Moritz Fischer <mdf@...nel.org>
> > ---
> > v2: switched to GPLv2 license.
> > v3: rename intel-fpga.h to fpga-dfl.h and rebased.
> > v4: fix SPDX license issue.
> > add Acked-by from Alan and Moritz.
> > ---
> > Documentation/ioctl/ioctl-number.txt | 1 +
> > drivers/fpga/dfl-fme-main.c | 12 +++++++++
> > include/uapi/linux/fpga-dfl.h | 48 ++++++++++++++++++++++++++++++++++++
> > 3 files changed, 61 insertions(+)
> > create mode 100644 include/uapi/linux/fpga-dfl.h
> >
> > diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
> > index 6501389..f1e7baa 100644
> > --- a/Documentation/ioctl/ioctl-number.txt
> > +++ b/Documentation/ioctl/ioctl-number.txt
> > @@ -324,6 +324,7 @@ Code Seq#(hex) Include File Comments
> > 0xB3 00 linux/mmc/ioctl.h
> > 0xB4 00-0F linux/gpio.h <mailto:linux-gpio@...r.kernel.org>
> > 0xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@...r.kernel.org>
> > +0xB6 all linux/fpga-dfl.h
> > 0xC0 00-0F linux/usb/iowarrior.h
> > 0xCA 00-0F uapi/misc/cxl.h
> > 0xCA 10-2F uapi/misc/ocxl.h
> > diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
> > index 056ae24..1a9929c 100644
> > --- a/drivers/fpga/dfl-fme-main.c
> > +++ b/drivers/fpga/dfl-fme-main.c
> > @@ -16,6 +16,7 @@
> >
> > #include <linux/kernel.h>
> > #include <linux/module.h>
> > +#include <linux/fpga-dfl.h>
> >
> > #include "dfl.h"
> >
> > @@ -114,6 +115,13 @@ static struct feature_driver fme_feature_drvs[] = {
> > },
> > };
> >
> > +static long fme_ioctl_check_extension(struct feature_platform_data *pdata,
> > + unsigned long arg)
> > +{
> > + /* No extension support for now */
> > + return 0;
> > +}
> > +
> > static int fme_open(struct inode *inode, struct file *filp)
> > {
> > struct platform_device *fdev = fpga_inode_to_feature_dev(inode);
> > @@ -154,6 +162,10 @@ static long fme_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> > dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd);
> >
> > switch (cmd) {
> > + case FPGA_GET_API_VERSION:
> > + return FPGA_API_VERSION;
> > + case FPGA_CHECK_EXTENSION:
> > + return fme_ioctl_check_extension(pdata, arg);
> > default:
> > /*
> > * Let sub-feature's ioctl function to handle the cmd
> > diff --git a/include/uapi/linux/fpga-dfl.h b/include/uapi/linux/fpga-dfl.h
> > new file mode 100644
> > index 0000000..9321ee9
> > --- /dev/null
> > +++ b/include/uapi/linux/fpga-dfl.h
> > @@ -0,0 +1,48 @@
> > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > +/*
> > + * Header File for FPGA DFL User API
> > + *
> > + * Copyright (C) 2017 Intel Corporation, Inc.
> > + *
> > + * Authors:
> > + * Kang Luwei <luwei.kang@...el.com>
> > + * Zhang Yi <yi.z.zhang@...el.com>
> > + * Wu Hao <hao.wu@...el.com>
> > + * Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> > + */
> > +
> > +#ifndef _UAPI_LINUX_FPGA_DFL_H
> > +#define _UAPI_LINUX_FPGA_DFL_H
> > +
> > +#define FPGA_API_VERSION 0
>
> There will be other FPGA API's. Maybe DFL_FPGA_... or FME_FPGA_...
I will pick DFL_FPGA_... here and below places. :)
>
> > +
> > +/*
> > + * The IOCTL interface for DFL based FPGA is designed for extensibility by
> > + * embedding the structure length (argsz) and flags into structures passed
> > + * between kernel and userspace. This design referenced the VFIO IOCTL
> > + * interface (include/uapi/linux/vfio.h).
> > + */
> > +
> > +#define FPGA_MAGIC 0xB6
>
> Same here.
>
> > +
> > +#define FPGA_BASE 0
>
> And here.
>
> > +
> > +/**
> > + * FPGA_GET_API_VERSION - _IO(FPGA_MAGIC, FPGA_BASE + 0)
> > + *
> > + * Report the version of the driver API.
> > + * Return: Driver API Version.
> > + */
> > +
> > +#define FPGA_GET_API_VERSION _IO(FPGA_MAGIC, FPGA_BASE + 0)
> > +
> > +/**
> > + * FPGA_CHECK_EXTENSION - _IO(FPGA_MAGIC, FPGA_BASE + 1)
> > + *
> > + * Check whether an extension is supported.
> > + * Return: 0 if not supported, otherwise the extension is supported.
> > + */
> > +
> > +#define FPGA_CHECK_EXTENSION _IO(FPGA_MAGIC, FPGA_BASE + 1)
>
> Basically all the FPGA_* stuff here is specific to this particular DFL
> FPGA API and should have a better name.
Will update them in the next version, thanks again for the comments.
Hao
>
> Alan
>
> > +
> > +#endif /* _UAPI_LINUX_FPGA_DFL_H */
> > --
> > 2.7.4
> >
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