On Tue, Feb 13, 2018 at 3:24 AM, Wu Hao <hao.wu@xxxxxxxxx> 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. > FPGA_GET_API_VERSION and FPGA_CHECK_EXTENSION ioctls are common ones which Maybe DFL_FPGA_GET_API_VERSION? > 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@xxxxxxxxx> > Signed-off-by: Enno Luebbers <enno.luebbers@xxxxxxxxx> > Signed-off-by: Shiva Rao <shiva.rao@xxxxxxxxx> > Signed-off-by: Christopher Rauer <christopher.rauer@xxxxxxxxx> > Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> > Signed-off-by: Wu Hao <hao.wu@xxxxxxxxx> > Acked-by: Alan Tull <atull@xxxxxxxxxx> > Acked-by: Moritz Fischer <mdf@xxxxxxxxxx> > --- > 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@xxxxxxxxxxxxxxx> > 0xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@xxxxxxxxxxxxxxx> > +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@xxxxxxxxx> > + * Zhang Yi <yi.z.zhang@xxxxxxxxx> > + * Wu Hao <hao.wu@xxxxxxxxx> > + * Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> > + */ > + > +#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_... > + > +/* > + * 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. Alan > + > +#endif /* _UAPI_LINUX_FPGA_DFL_H */ > -- > 2.7.4 > -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
