Commit bbfb54e7 authored by Xu Yilun's avatar Xu Yilun Committed by Greg Kroah-Hartman
Browse files

uio: uio_dfl: add userspace i/o driver for DFL bus 



This patch supports the DFL drivers be written in userspace. This is
realized by exposing the userspace I/O device interfaces.

The driver now only binds the ether group feature, which has no irq. So
the irq support is not implemented yet.

Reviewed-by: default avatarTom Rix <trix@redhat.com>
Signed-off-by: default avatarXu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/1615168776-8553-2-git-send-email-yilun.xu@intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent db3a4f0a

MAINTAINERS

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@@ -6992,6 +6992,7 @@ S: Maintained 
F:	Documentation/ABI/testing/sysfs-bus-dfl*

F:	Documentation/fpga/dfl.rst

F:	drivers/fpga/dfl*

F:	drivers/uio/uio_dfl.c

F:	include/linux/dfl.h

F:	include/uapi/linux/fpga-dfl.h


































drivers/uio/Kconfig



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@@ -165,4 +165,21 @@ config UIO_HV_GENERIC







	  to network and storage devices from userspace.



















	  If you compile this as a module, it will be called uio_hv_generic.



















config UIO_DFL









	tristate "Generic driver for DFL (Device Feature List) bus"









	depends on FPGA_DFL









	help









	  Generic DFL (Device Feature List) driver for Userspace I/O devices.









	  It is useful to provide direct access to DFL devices from userspace.









	  A sample userspace application using this driver is available for









	  download in a git repository:



















	    git clone https://github.com/OPAE/opae-sdk.git



















	  It could be found at:



















	    opae-sdk/tools/libopaeuio/



















	  If you compile this as a module, it will be called uio_dfl.









endif
























drivers/uio/Makefile



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@@ -11,3 +11,4 @@ obj-$(CONFIG_UIO_PRUSS)         += uio_pruss.o







obj-$(CONFIG_UIO_MF624)         += uio_mf624.o









obj-$(CONFIG_UIO_FSL_ELBC_GPCM)	+= uio_fsl_elbc_gpcm.o









obj-$(CONFIG_UIO_HV_GENERIC)	+= uio_hv_generic.o









obj-$(CONFIG_UIO_DFL)	+= uio_dfl.o
























drivers/uio/uio_dfl.c
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// SPDX-License-Identifier: GPL-2.0









/*









 * Generic DFL driver for Userspace I/O devicess









 *









 * Copyright (C) 2021 Intel Corporation, Inc.









 */









#include <linux/dfl.h>









#include <linux/errno.h>









#include <linux/module.h>









#include <linux/uio_driver.h>



















#define DRIVER_NAME "uio_dfl"



















static int uio_dfl_probe(struct dfl_device *ddev)









{









	struct resource *r = &ddev->mmio_res;









	struct device *dev = &ddev->dev;









	struct uio_info *uioinfo;









	struct uio_mem *uiomem;









	int ret;



















	uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL);









	if (!uioinfo)









		return -ENOMEM;



















	uioinfo->name = DRIVER_NAME;









	uioinfo->version = "0";



















	uiomem = &uioinfo->mem[0];









	uiomem->memtype = UIO_MEM_PHYS;









	uiomem->addr = r->start & PAGE_MASK;









	uiomem->offs = r->start & ~PAGE_MASK;









	uiomem->size = (uiomem->offs + resource_size(r)









			+ PAGE_SIZE - 1) & PAGE_MASK;









	uiomem->name = r->name;



















	/* Irq is yet to be supported */









	uioinfo->irq = UIO_IRQ_NONE;



















	ret = devm_uio_register_device(dev, uioinfo);









	if (ret)









		dev_err(dev, "unable to register uio device\n");



















	return ret;









}



















#define FME_FEATURE_ID_ETH_GROUP	0x10



















static const struct dfl_device_id uio_dfl_ids[] = {









	{ FME_ID, FME_FEATURE_ID_ETH_GROUP },









	{ }









};









MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);



















static struct dfl_driver uio_dfl_driver = {









	.drv = {









		.name = DRIVER_NAME,









	},









	.id_table	= uio_dfl_ids,









	.probe		= uio_dfl_probe,









};









module_dfl_driver(uio_dfl_driver);



















MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices");









MODULE_AUTHOR("Intel Corporation");









MODULE_LICENSE("GPL v2");