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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/device/bus.h>
#include "idxd.h"
extern int device_driver_attach(struct device_driver *drv, struct device *dev);
extern void device_driver_detach(struct device *dev);
#define DRIVER_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
struct driver_attribute driver_attr_##_name = \
__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
static ssize_t unbind_store(struct device_driver *drv, const char *buf, size_t count)
{
const struct bus_type *bus = drv->bus;
struct device *dev;
int rc = -ENODEV;
dev = bus_find_device_by_name(bus, NULL, buf);
if (dev && dev->driver) {
device_driver_detach(dev);
rc = count;
}
return rc;
}
static DRIVER_ATTR_IGNORE_LOCKDEP(unbind, 0200, NULL, unbind_store);
static ssize_t bind_store(struct device_driver *drv, const char *buf, size_t count)
{
const struct bus_type *bus = drv->bus;
struct device *dev;
struct device_driver *alt_drv = NULL;
int rc = -ENODEV;
struct idxd_dev *idxd_dev;
dev = bus_find_device_by_name(bus, NULL, buf);
if (!dev || dev->driver || drv != &dsa_drv.drv)
return -ENODEV;
idxd_dev = confdev_to_idxd_dev(dev);
if (is_idxd_dev(idxd_dev)) {
alt_drv = driver_find("idxd", bus);
} else if (is_idxd_wq_dev(idxd_dev)) {
struct idxd_wq *wq = confdev_to_wq(dev);
if (is_idxd_wq_kernel(wq))
alt_drv = driver_find("dmaengine", bus);
else if (is_idxd_wq_user(wq))
alt_drv = driver_find("user", bus);
}
if (!alt_drv)
return -ENODEV;
rc = device_driver_attach(alt_drv, dev);
if (rc < 0)
return rc;
return count;
}
static DRIVER_ATTR_IGNORE_LOCKDEP(bind, 0200, NULL, bind_store);
static struct attribute *dsa_drv_compat_attrs[] = {
&driver_attr_bind.attr,
&driver_attr_unbind.attr,
NULL,
};
static const struct attribute_group dsa_drv_compat_attr_group = {
.attrs = dsa_drv_compat_attrs,
};
static const struct attribute_group *dsa_drv_compat_groups[] = {
&dsa_drv_compat_attr_group,
NULL,
};
static int idxd_dsa_drv_probe(struct idxd_dev *idxd_dev)
{
return -ENODEV;
}
static void idxd_dsa_drv_remove(struct idxd_dev *idxd_dev)
{
}
static enum idxd_dev_type dev_types[] = {
IDXD_DEV_NONE,
};
struct idxd_device_driver dsa_drv = {
.name = "dsa",
.probe = idxd_dsa_drv_probe,
.remove = idxd_dsa_drv_remove,
.type = dev_types,
.drv = {
.suppress_bind_attrs = true,
.groups = dsa_drv_compat_groups,
},
};
module_idxd_driver(dsa_drv);
MODULE_IMPORT_NS(IDXD);
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