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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compat.c (2587B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */
      3#include <linux/init.h>
      4#include <linux/kernel.h>
      5#include <linux/module.h>
      6#include <linux/device.h>
      7#include <linux/device/bus.h>
      8#include "idxd.h"
      9
     10extern int device_driver_attach(struct device_driver *drv, struct device *dev);
     11extern void device_driver_detach(struct device *dev);
     12
     13#define DRIVER_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)	\
     14	struct driver_attribute driver_attr_##_name =		\
     15	__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
     16
     17static ssize_t unbind_store(struct device_driver *drv, const char *buf, size_t count)
     18{
     19	struct bus_type *bus = drv->bus;
     20	struct device *dev;
     21	int rc = -ENODEV;
     22
     23	dev = bus_find_device_by_name(bus, NULL, buf);
     24	if (dev && dev->driver) {
     25		device_driver_detach(dev);
     26		rc = count;
     27	}
     28
     29	return rc;
     30}
     31static DRIVER_ATTR_IGNORE_LOCKDEP(unbind, 0200, NULL, unbind_store);
     32
     33static ssize_t bind_store(struct device_driver *drv, const char *buf, size_t count)
     34{
     35	struct bus_type *bus = drv->bus;
     36	struct device *dev;
     37	struct device_driver *alt_drv = NULL;
     38	int rc = -ENODEV;
     39	struct idxd_dev *idxd_dev;
     40
     41	dev = bus_find_device_by_name(bus, NULL, buf);
     42	if (!dev || dev->driver || drv != &dsa_drv.drv)
     43		return -ENODEV;
     44
     45	idxd_dev = confdev_to_idxd_dev(dev);
     46	if (is_idxd_dev(idxd_dev)) {
     47		alt_drv = driver_find("idxd", bus);
     48	} else if (is_idxd_wq_dev(idxd_dev)) {
     49		struct idxd_wq *wq = confdev_to_wq(dev);
     50
     51		if (is_idxd_wq_kernel(wq))
     52			alt_drv = driver_find("dmaengine", bus);
     53		else if (is_idxd_wq_user(wq))
     54			alt_drv = driver_find("user", bus);
     55	}
     56	if (!alt_drv)
     57		return -ENODEV;
     58
     59	rc = device_driver_attach(alt_drv, dev);
     60	if (rc < 0)
     61		return rc;
     62
     63	return count;
     64}
     65static DRIVER_ATTR_IGNORE_LOCKDEP(bind, 0200, NULL, bind_store);
     66
     67static struct attribute *dsa_drv_compat_attrs[] = {
     68	&driver_attr_bind.attr,
     69	&driver_attr_unbind.attr,
     70	NULL,
     71};
     72
     73static const struct attribute_group dsa_drv_compat_attr_group = {
     74	.attrs = dsa_drv_compat_attrs,
     75};
     76
     77static const struct attribute_group *dsa_drv_compat_groups[] = {
     78	&dsa_drv_compat_attr_group,
     79	NULL,
     80};
     81
     82static int idxd_dsa_drv_probe(struct idxd_dev *idxd_dev)
     83{
     84	return -ENODEV;
     85}
     86
     87static void idxd_dsa_drv_remove(struct idxd_dev *idxd_dev)
     88{
     89}
     90
     91static enum idxd_dev_type dev_types[] = {
     92	IDXD_DEV_NONE,
     93};
     94
     95struct idxd_device_driver dsa_drv = {
     96	.name = "dsa",
     97	.probe = idxd_dsa_drv_probe,
     98	.remove = idxd_dsa_drv_remove,
     99	.type = dev_types,
    100	.drv = {
    101		.suppress_bind_attrs = true,
    102		.groups = dsa_drv_compat_groups,
    103	},
    104};
    105
    106module_idxd_driver(dsa_drv);
    107MODULE_IMPORT_NS(IDXD);