cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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uio_dfl.c (1619B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Generic DFL driver for Userspace I/O devicess
      4 *
      5 * Copyright (C) 2021 Intel Corporation, Inc.
      6 */
      7#include <linux/dfl.h>
      8#include <linux/errno.h>
      9#include <linux/module.h>
     10#include <linux/uio_driver.h>
     11
     12#define DRIVER_NAME "uio_dfl"
     13
     14static int uio_dfl_probe(struct dfl_device *ddev)
     15{
     16	struct resource *r = &ddev->mmio_res;
     17	struct device *dev = &ddev->dev;
     18	struct uio_info *uioinfo;
     19	struct uio_mem *uiomem;
     20	int ret;
     21
     22	uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL);
     23	if (!uioinfo)
     24		return -ENOMEM;
     25
     26	uioinfo->name = DRIVER_NAME;
     27	uioinfo->version = "0";
     28
     29	uiomem = &uioinfo->mem[0];
     30	uiomem->memtype = UIO_MEM_PHYS;
     31	uiomem->addr = r->start & PAGE_MASK;
     32	uiomem->offs = r->start & ~PAGE_MASK;
     33	uiomem->size = (uiomem->offs + resource_size(r)
     34			+ PAGE_SIZE - 1) & PAGE_MASK;
     35	uiomem->name = r->name;
     36
     37	/* Irq is yet to be supported */
     38	uioinfo->irq = UIO_IRQ_NONE;
     39
     40	ret = devm_uio_register_device(dev, uioinfo);
     41	if (ret)
     42		dev_err(dev, "unable to register uio device\n");
     43
     44	return ret;
     45}
     46
     47#define FME_FEATURE_ID_ETH_GROUP	0x10
     48#define FME_FEATURE_ID_HSSI_SUBSYS	0x15
     49
     50static const struct dfl_device_id uio_dfl_ids[] = {
     51	{ FME_ID, FME_FEATURE_ID_ETH_GROUP },
     52	{ FME_ID, FME_FEATURE_ID_HSSI_SUBSYS },
     53	{ }
     54};
     55MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);
     56
     57static struct dfl_driver uio_dfl_driver = {
     58	.drv = {
     59		.name = DRIVER_NAME,
     60	},
     61	.id_table	= uio_dfl_ids,
     62	.probe		= uio_dfl_probe,
     63};
     64module_dfl_driver(uio_dfl_driver);
     65
     66MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices");
     67MODULE_AUTHOR("Intel Corporation");
     68MODULE_LICENSE("GPL v2");