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![Uwe Kleine-König](/assets/img/avatar_default.png)
The driver core ignores the return value of struct bus_type::remove() because there is only little that can be done. To simplify the quest to make this function return void, let struct dax_device_driver::remove() return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code isn't intended. Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org> Link: https://lore.kernel.org/r/20210205222842.34896-6-uwe@kleine-koenig.org Signed-off-by: Dan Williams <dan.j.williams@intel.com>
1470 lines
34 KiB
C
1470 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2017-2018 Intel Corporation. All rights reserved. */
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#include <linux/memremap.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/dax.h>
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#include <linux/io.h>
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#include "dax-private.h"
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#include "bus.h"
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static struct class *dax_class;
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static DEFINE_MUTEX(dax_bus_lock);
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#define DAX_NAME_LEN 30
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struct dax_id {
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struct list_head list;
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char dev_name[DAX_NAME_LEN];
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};
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static int dax_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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/*
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* We only ever expect to handle device-dax instances, i.e. the
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* @type argument to MODULE_ALIAS_DAX_DEVICE() is always zero
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*/
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return add_uevent_var(env, "MODALIAS=" DAX_DEVICE_MODALIAS_FMT, 0);
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}
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static struct dax_device_driver *to_dax_drv(struct device_driver *drv)
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{
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return container_of(drv, struct dax_device_driver, drv);
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}
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static struct dax_id *__dax_match_id(struct dax_device_driver *dax_drv,
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const char *dev_name)
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{
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struct dax_id *dax_id;
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lockdep_assert_held(&dax_bus_lock);
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list_for_each_entry(dax_id, &dax_drv->ids, list)
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if (sysfs_streq(dax_id->dev_name, dev_name))
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return dax_id;
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return NULL;
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}
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static int dax_match_id(struct dax_device_driver *dax_drv, struct device *dev)
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{
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int match;
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mutex_lock(&dax_bus_lock);
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match = !!__dax_match_id(dax_drv, dev_name(dev));
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mutex_unlock(&dax_bus_lock);
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return match;
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}
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enum id_action {
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ID_REMOVE,
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ID_ADD,
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};
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static ssize_t do_id_store(struct device_driver *drv, const char *buf,
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size_t count, enum id_action action)
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{
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struct dax_device_driver *dax_drv = to_dax_drv(drv);
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unsigned int region_id, id;
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char devname[DAX_NAME_LEN];
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struct dax_id *dax_id;
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ssize_t rc = count;
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int fields;
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fields = sscanf(buf, "dax%d.%d", ®ion_id, &id);
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if (fields != 2)
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return -EINVAL;
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sprintf(devname, "dax%d.%d", region_id, id);
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if (!sysfs_streq(buf, devname))
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return -EINVAL;
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mutex_lock(&dax_bus_lock);
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dax_id = __dax_match_id(dax_drv, buf);
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if (!dax_id) {
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if (action == ID_ADD) {
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dax_id = kzalloc(sizeof(*dax_id), GFP_KERNEL);
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if (dax_id) {
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strncpy(dax_id->dev_name, buf, DAX_NAME_LEN);
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list_add(&dax_id->list, &dax_drv->ids);
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} else
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rc = -ENOMEM;
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} else
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/* nothing to remove */;
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} else if (action == ID_REMOVE) {
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list_del(&dax_id->list);
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kfree(dax_id);
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} else
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/* dax_id already added */;
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mutex_unlock(&dax_bus_lock);
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if (rc < 0)
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return rc;
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if (action == ID_ADD)
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rc = driver_attach(drv);
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if (rc)
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return rc;
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return count;
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}
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static ssize_t new_id_store(struct device_driver *drv, const char *buf,
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size_t count)
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{
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return do_id_store(drv, buf, count, ID_ADD);
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}
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static DRIVER_ATTR_WO(new_id);
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static ssize_t remove_id_store(struct device_driver *drv, const char *buf,
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size_t count)
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{
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return do_id_store(drv, buf, count, ID_REMOVE);
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}
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static DRIVER_ATTR_WO(remove_id);
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static struct attribute *dax_drv_attrs[] = {
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&driver_attr_new_id.attr,
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&driver_attr_remove_id.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(dax_drv);
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static int dax_bus_match(struct device *dev, struct device_driver *drv);
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static bool is_static(struct dax_region *dax_region)
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{
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return (dax_region->res.flags & IORESOURCE_DAX_STATIC) != 0;
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}
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static u64 dev_dax_size(struct dev_dax *dev_dax)
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{
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u64 size = 0;
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int i;
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device_lock_assert(&dev_dax->dev);
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for (i = 0; i < dev_dax->nr_range; i++)
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size += range_len(&dev_dax->ranges[i].range);
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return size;
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}
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static int dax_bus_probe(struct device *dev)
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{
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struct dax_device_driver *dax_drv = to_dax_drv(dev->driver);
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struct dev_dax *dev_dax = to_dev_dax(dev);
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struct dax_region *dax_region = dev_dax->region;
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int rc;
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if (dev_dax_size(dev_dax) == 0 || dev_dax->id < 0)
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return -ENXIO;
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rc = dax_drv->probe(dev_dax);
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if (rc || is_static(dax_region))
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return rc;
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/*
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* Track new seed creation only after successful probe of the
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* previous seed.
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*/
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if (dax_region->seed == dev)
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dax_region->seed = NULL;
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return 0;
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}
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static int dax_bus_remove(struct device *dev)
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{
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struct dax_device_driver *dax_drv = to_dax_drv(dev->driver);
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struct dev_dax *dev_dax = to_dev_dax(dev);
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if (dax_drv->remove)
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dax_drv->remove(dev_dax);
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return 0;
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}
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static struct bus_type dax_bus_type = {
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.name = "dax",
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.uevent = dax_bus_uevent,
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.match = dax_bus_match,
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.probe = dax_bus_probe,
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.remove = dax_bus_remove,
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.drv_groups = dax_drv_groups,
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};
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static int dax_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct dax_device_driver *dax_drv = to_dax_drv(drv);
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/*
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* All but the 'device-dax' driver, which has 'match_always'
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* set, requires an exact id match.
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*/
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if (dax_drv->match_always)
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return 1;
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return dax_match_id(dax_drv, dev);
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}
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/*
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* Rely on the fact that drvdata is set before the attributes are
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* registered, and that the attributes are unregistered before drvdata
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* is cleared to assume that drvdata is always valid.
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*/
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static ssize_t id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", dax_region->id);
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}
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static DEVICE_ATTR_RO(id);
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static ssize_t region_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region = dev_get_drvdata(dev);
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return sprintf(buf, "%llu\n", (unsigned long long)
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resource_size(&dax_region->res));
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}
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static struct device_attribute dev_attr_region_size = __ATTR(size, 0444,
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region_size_show, NULL);
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static ssize_t region_align_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region = dev_get_drvdata(dev);
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return sprintf(buf, "%u\n", dax_region->align);
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}
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static struct device_attribute dev_attr_region_align =
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__ATTR(align, 0400, region_align_show, NULL);
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#define for_each_dax_region_resource(dax_region, res) \
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for (res = (dax_region)->res.child; res; res = res->sibling)
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static unsigned long long dax_region_avail_size(struct dax_region *dax_region)
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{
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resource_size_t size = resource_size(&dax_region->res);
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struct resource *res;
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device_lock_assert(dax_region->dev);
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for_each_dax_region_resource(dax_region, res)
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size -= resource_size(res);
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return size;
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}
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static ssize_t available_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region = dev_get_drvdata(dev);
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unsigned long long size;
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device_lock(dev);
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size = dax_region_avail_size(dax_region);
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device_unlock(dev);
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return sprintf(buf, "%llu\n", size);
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}
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static DEVICE_ATTR_RO(available_size);
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static ssize_t seed_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region = dev_get_drvdata(dev);
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struct device *seed;
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ssize_t rc;
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if (is_static(dax_region))
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return -EINVAL;
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device_lock(dev);
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seed = dax_region->seed;
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rc = sprintf(buf, "%s\n", seed ? dev_name(seed) : "");
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device_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(seed);
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static ssize_t create_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region = dev_get_drvdata(dev);
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struct device *youngest;
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ssize_t rc;
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if (is_static(dax_region))
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return -EINVAL;
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device_lock(dev);
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youngest = dax_region->youngest;
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rc = sprintf(buf, "%s\n", youngest ? dev_name(youngest) : "");
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device_unlock(dev);
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return rc;
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}
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static ssize_t create_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct dax_region *dax_region = dev_get_drvdata(dev);
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unsigned long long avail;
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ssize_t rc;
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int val;
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if (is_static(dax_region))
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return -EINVAL;
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rc = kstrtoint(buf, 0, &val);
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if (rc)
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return rc;
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if (val != 1)
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return -EINVAL;
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device_lock(dev);
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avail = dax_region_avail_size(dax_region);
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if (avail == 0)
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rc = -ENOSPC;
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else {
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struct dev_dax_data data = {
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.dax_region = dax_region,
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.size = 0,
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.id = -1,
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};
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struct dev_dax *dev_dax = devm_create_dev_dax(&data);
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if (IS_ERR(dev_dax))
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rc = PTR_ERR(dev_dax);
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else {
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/*
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* In support of crafting multiple new devices
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* simultaneously multiple seeds can be created,
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* but only the first one that has not been
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* successfully bound is tracked as the region
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* seed.
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*/
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if (!dax_region->seed)
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dax_region->seed = &dev_dax->dev;
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dax_region->youngest = &dev_dax->dev;
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rc = len;
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}
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}
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device_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RW(create);
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void kill_dev_dax(struct dev_dax *dev_dax)
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{
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struct dax_device *dax_dev = dev_dax->dax_dev;
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struct inode *inode = dax_inode(dax_dev);
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kill_dax(dax_dev);
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unmap_mapping_range(inode->i_mapping, 0, 0, 1);
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}
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EXPORT_SYMBOL_GPL(kill_dev_dax);
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static void trim_dev_dax_range(struct dev_dax *dev_dax)
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{
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int i = dev_dax->nr_range - 1;
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struct range *range = &dev_dax->ranges[i].range;
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struct dax_region *dax_region = dev_dax->region;
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device_lock_assert(dax_region->dev);
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dev_dbg(&dev_dax->dev, "delete range[%d]: %#llx:%#llx\n", i,
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(unsigned long long)range->start,
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(unsigned long long)range->end);
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__release_region(&dax_region->res, range->start, range_len(range));
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if (--dev_dax->nr_range == 0) {
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kfree(dev_dax->ranges);
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dev_dax->ranges = NULL;
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}
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}
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static void free_dev_dax_ranges(struct dev_dax *dev_dax)
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{
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while (dev_dax->nr_range)
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trim_dev_dax_range(dev_dax);
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}
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static void unregister_dev_dax(void *dev)
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{
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struct dev_dax *dev_dax = to_dev_dax(dev);
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dev_dbg(dev, "%s\n", __func__);
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kill_dev_dax(dev_dax);
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free_dev_dax_ranges(dev_dax);
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device_del(dev);
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put_device(dev);
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}
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/* a return value >= 0 indicates this invocation invalidated the id */
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static int __free_dev_dax_id(struct dev_dax *dev_dax)
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{
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struct dax_region *dax_region = dev_dax->region;
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struct device *dev = &dev_dax->dev;
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int rc = dev_dax->id;
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device_lock_assert(dev);
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if (is_static(dax_region) || dev_dax->id < 0)
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return -1;
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ida_free(&dax_region->ida, dev_dax->id);
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dev_dax->id = -1;
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return rc;
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}
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static int free_dev_dax_id(struct dev_dax *dev_dax)
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{
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struct device *dev = &dev_dax->dev;
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int rc;
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device_lock(dev);
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rc = __free_dev_dax_id(dev_dax);
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device_unlock(dev);
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return rc;
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}
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static ssize_t delete_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct dax_region *dax_region = dev_get_drvdata(dev);
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struct dev_dax *dev_dax;
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struct device *victim;
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bool do_del = false;
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int rc;
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if (is_static(dax_region))
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return -EINVAL;
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victim = device_find_child_by_name(dax_region->dev, buf);
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if (!victim)
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return -ENXIO;
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device_lock(dev);
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device_lock(victim);
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dev_dax = to_dev_dax(victim);
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if (victim->driver || dev_dax_size(dev_dax))
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rc = -EBUSY;
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else {
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/*
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* Invalidate the device so it does not become active
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* again, but always preserve device-id-0 so that
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* /sys/bus/dax/ is guaranteed to be populated while any
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* dax_region is registered.
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*/
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if (dev_dax->id > 0) {
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do_del = __free_dev_dax_id(dev_dax) >= 0;
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rc = len;
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if (dax_region->seed == victim)
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dax_region->seed = NULL;
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if (dax_region->youngest == victim)
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dax_region->youngest = NULL;
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} else
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rc = -EBUSY;
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}
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device_unlock(victim);
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/* won the race to invalidate the device, clean it up */
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if (do_del)
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devm_release_action(dev, unregister_dev_dax, victim);
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device_unlock(dev);
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put_device(victim);
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return rc;
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}
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static DEVICE_ATTR_WO(delete);
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static umode_t dax_region_visible(struct kobject *kobj, struct attribute *a,
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int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct dax_region *dax_region = dev_get_drvdata(dev);
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if (is_static(dax_region))
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if (a == &dev_attr_available_size.attr
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|| a == &dev_attr_create.attr
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|| a == &dev_attr_seed.attr
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|| a == &dev_attr_delete.attr)
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return 0;
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return a->mode;
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}
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static struct attribute *dax_region_attributes[] = {
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&dev_attr_available_size.attr,
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&dev_attr_region_size.attr,
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&dev_attr_region_align.attr,
|
|
&dev_attr_create.attr,
|
|
&dev_attr_seed.attr,
|
|
&dev_attr_delete.attr,
|
|
&dev_attr_id.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group dax_region_attribute_group = {
|
|
.name = "dax_region",
|
|
.attrs = dax_region_attributes,
|
|
.is_visible = dax_region_visible,
|
|
};
|
|
|
|
static const struct attribute_group *dax_region_attribute_groups[] = {
|
|
&dax_region_attribute_group,
|
|
NULL,
|
|
};
|
|
|
|
static void dax_region_free(struct kref *kref)
|
|
{
|
|
struct dax_region *dax_region;
|
|
|
|
dax_region = container_of(kref, struct dax_region, kref);
|
|
kfree(dax_region);
|
|
}
|
|
|
|
void dax_region_put(struct dax_region *dax_region)
|
|
{
|
|
kref_put(&dax_region->kref, dax_region_free);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dax_region_put);
|
|
|
|
static void dax_region_unregister(void *region)
|
|
{
|
|
struct dax_region *dax_region = region;
|
|
|
|
sysfs_remove_groups(&dax_region->dev->kobj,
|
|
dax_region_attribute_groups);
|
|
dax_region_put(dax_region);
|
|
}
|
|
|
|
struct dax_region *alloc_dax_region(struct device *parent, int region_id,
|
|
struct range *range, int target_node, unsigned int align,
|
|
unsigned long flags)
|
|
{
|
|
struct dax_region *dax_region;
|
|
|
|
/*
|
|
* The DAX core assumes that it can store its private data in
|
|
* parent->driver_data. This WARN is a reminder / safeguard for
|
|
* developers of device-dax drivers.
|
|
*/
|
|
if (dev_get_drvdata(parent)) {
|
|
dev_WARN(parent, "dax core failed to setup private data\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (!IS_ALIGNED(range->start, align)
|
|
|| !IS_ALIGNED(range_len(range), align))
|
|
return NULL;
|
|
|
|
dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL);
|
|
if (!dax_region)
|
|
return NULL;
|
|
|
|
dev_set_drvdata(parent, dax_region);
|
|
kref_init(&dax_region->kref);
|
|
dax_region->id = region_id;
|
|
dax_region->align = align;
|
|
dax_region->dev = parent;
|
|
dax_region->target_node = target_node;
|
|
ida_init(&dax_region->ida);
|
|
dax_region->res = (struct resource) {
|
|
.start = range->start,
|
|
.end = range->end,
|
|
.flags = IORESOURCE_MEM | flags,
|
|
};
|
|
|
|
if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) {
|
|
kfree(dax_region);
|
|
return NULL;
|
|
}
|
|
|
|
kref_get(&dax_region->kref);
|
|
if (devm_add_action_or_reset(parent, dax_region_unregister, dax_region))
|
|
return NULL;
|
|
return dax_region;
|
|
}
|
|
EXPORT_SYMBOL_GPL(alloc_dax_region);
|
|
|
|
static void dax_mapping_release(struct device *dev)
|
|
{
|
|
struct dax_mapping *mapping = to_dax_mapping(dev);
|
|
struct dev_dax *dev_dax = to_dev_dax(dev->parent);
|
|
|
|
ida_free(&dev_dax->ida, mapping->id);
|
|
kfree(mapping);
|
|
}
|
|
|
|
static void unregister_dax_mapping(void *data)
|
|
{
|
|
struct device *dev = data;
|
|
struct dax_mapping *mapping = to_dax_mapping(dev);
|
|
struct dev_dax *dev_dax = to_dev_dax(dev->parent);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
|
|
dev_dbg(dev, "%s\n", __func__);
|
|
|
|
device_lock_assert(dax_region->dev);
|
|
|
|
dev_dax->ranges[mapping->range_id].mapping = NULL;
|
|
mapping->range_id = -1;
|
|
|
|
device_del(dev);
|
|
put_device(dev);
|
|
}
|
|
|
|
static struct dev_dax_range *get_dax_range(struct device *dev)
|
|
{
|
|
struct dax_mapping *mapping = to_dax_mapping(dev);
|
|
struct dev_dax *dev_dax = to_dev_dax(dev->parent);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
|
|
device_lock(dax_region->dev);
|
|
if (mapping->range_id < 0) {
|
|
device_unlock(dax_region->dev);
|
|
return NULL;
|
|
}
|
|
|
|
return &dev_dax->ranges[mapping->range_id];
|
|
}
|
|
|
|
static void put_dax_range(struct dev_dax_range *dax_range)
|
|
{
|
|
struct dax_mapping *mapping = dax_range->mapping;
|
|
struct dev_dax *dev_dax = to_dev_dax(mapping->dev.parent);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
|
|
device_unlock(dax_region->dev);
|
|
}
|
|
|
|
static ssize_t start_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dev_dax_range *dax_range;
|
|
ssize_t rc;
|
|
|
|
dax_range = get_dax_range(dev);
|
|
if (!dax_range)
|
|
return -ENXIO;
|
|
rc = sprintf(buf, "%#llx\n", dax_range->range.start);
|
|
put_dax_range(dax_range);
|
|
|
|
return rc;
|
|
}
|
|
static DEVICE_ATTR(start, 0400, start_show, NULL);
|
|
|
|
static ssize_t end_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dev_dax_range *dax_range;
|
|
ssize_t rc;
|
|
|
|
dax_range = get_dax_range(dev);
|
|
if (!dax_range)
|
|
return -ENXIO;
|
|
rc = sprintf(buf, "%#llx\n", dax_range->range.end);
|
|
put_dax_range(dax_range);
|
|
|
|
return rc;
|
|
}
|
|
static DEVICE_ATTR(end, 0400, end_show, NULL);
|
|
|
|
static ssize_t pgoff_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dev_dax_range *dax_range;
|
|
ssize_t rc;
|
|
|
|
dax_range = get_dax_range(dev);
|
|
if (!dax_range)
|
|
return -ENXIO;
|
|
rc = sprintf(buf, "%#lx\n", dax_range->pgoff);
|
|
put_dax_range(dax_range);
|
|
|
|
return rc;
|
|
}
|
|
static DEVICE_ATTR(page_offset, 0400, pgoff_show, NULL);
|
|
|
|
static struct attribute *dax_mapping_attributes[] = {
|
|
&dev_attr_start.attr,
|
|
&dev_attr_end.attr,
|
|
&dev_attr_page_offset.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group dax_mapping_attribute_group = {
|
|
.attrs = dax_mapping_attributes,
|
|
};
|
|
|
|
static const struct attribute_group *dax_mapping_attribute_groups[] = {
|
|
&dax_mapping_attribute_group,
|
|
NULL,
|
|
};
|
|
|
|
static struct device_type dax_mapping_type = {
|
|
.release = dax_mapping_release,
|
|
.groups = dax_mapping_attribute_groups,
|
|
};
|
|
|
|
static int devm_register_dax_mapping(struct dev_dax *dev_dax, int range_id)
|
|
{
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
struct dax_mapping *mapping;
|
|
struct device *dev;
|
|
int rc;
|
|
|
|
device_lock_assert(dax_region->dev);
|
|
|
|
if (dev_WARN_ONCE(&dev_dax->dev, !dax_region->dev->driver,
|
|
"region disabled\n"))
|
|
return -ENXIO;
|
|
|
|
mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
|
|
if (!mapping)
|
|
return -ENOMEM;
|
|
mapping->range_id = range_id;
|
|
mapping->id = ida_alloc(&dev_dax->ida, GFP_KERNEL);
|
|
if (mapping->id < 0) {
|
|
kfree(mapping);
|
|
return -ENOMEM;
|
|
}
|
|
dev_dax->ranges[range_id].mapping = mapping;
|
|
dev = &mapping->dev;
|
|
device_initialize(dev);
|
|
dev->parent = &dev_dax->dev;
|
|
dev->type = &dax_mapping_type;
|
|
dev_set_name(dev, "mapping%d", mapping->id);
|
|
rc = device_add(dev);
|
|
if (rc) {
|
|
put_device(dev);
|
|
return rc;
|
|
}
|
|
|
|
rc = devm_add_action_or_reset(dax_region->dev, unregister_dax_mapping,
|
|
dev);
|
|
if (rc)
|
|
return rc;
|
|
return 0;
|
|
}
|
|
|
|
static int alloc_dev_dax_range(struct dev_dax *dev_dax, u64 start,
|
|
resource_size_t size)
|
|
{
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
struct resource *res = &dax_region->res;
|
|
struct device *dev = &dev_dax->dev;
|
|
struct dev_dax_range *ranges;
|
|
unsigned long pgoff = 0;
|
|
struct resource *alloc;
|
|
int i, rc;
|
|
|
|
device_lock_assert(dax_region->dev);
|
|
|
|
/* handle the seed alloc special case */
|
|
if (!size) {
|
|
if (dev_WARN_ONCE(dev, dev_dax->nr_range,
|
|
"0-size allocation must be first\n"))
|
|
return -EBUSY;
|
|
/* nr_range == 0 is elsewhere special cased as 0-size device */
|
|
return 0;
|
|
}
|
|
|
|
alloc = __request_region(res, start, size, dev_name(dev), 0);
|
|
if (!alloc)
|
|
return -ENOMEM;
|
|
|
|
ranges = krealloc(dev_dax->ranges, sizeof(*ranges)
|
|
* (dev_dax->nr_range + 1), GFP_KERNEL);
|
|
if (!ranges) {
|
|
__release_region(res, alloc->start, resource_size(alloc));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < dev_dax->nr_range; i++)
|
|
pgoff += PHYS_PFN(range_len(&ranges[i].range));
|
|
dev_dax->ranges = ranges;
|
|
ranges[dev_dax->nr_range++] = (struct dev_dax_range) {
|
|
.pgoff = pgoff,
|
|
.range = {
|
|
.start = alloc->start,
|
|
.end = alloc->end,
|
|
},
|
|
};
|
|
|
|
dev_dbg(dev, "alloc range[%d]: %pa:%pa\n", dev_dax->nr_range - 1,
|
|
&alloc->start, &alloc->end);
|
|
/*
|
|
* A dev_dax instance must be registered before mapping device
|
|
* children can be added. Defer to devm_create_dev_dax() to add
|
|
* the initial mapping device.
|
|
*/
|
|
if (!device_is_registered(&dev_dax->dev))
|
|
return 0;
|
|
|
|
rc = devm_register_dax_mapping(dev_dax, dev_dax->nr_range - 1);
|
|
if (rc)
|
|
trim_dev_dax_range(dev_dax);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int adjust_dev_dax_range(struct dev_dax *dev_dax, struct resource *res, resource_size_t size)
|
|
{
|
|
int last_range = dev_dax->nr_range - 1;
|
|
struct dev_dax_range *dax_range = &dev_dax->ranges[last_range];
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
bool is_shrink = resource_size(res) > size;
|
|
struct range *range = &dax_range->range;
|
|
struct device *dev = &dev_dax->dev;
|
|
int rc;
|
|
|
|
device_lock_assert(dax_region->dev);
|
|
|
|
if (dev_WARN_ONCE(dev, !size, "deletion is handled by dev_dax_shrink\n"))
|
|
return -EINVAL;
|
|
|
|
rc = adjust_resource(res, range->start, size);
|
|
if (rc)
|
|
return rc;
|
|
|
|
*range = (struct range) {
|
|
.start = range->start,
|
|
.end = range->start + size - 1,
|
|
};
|
|
|
|
dev_dbg(dev, "%s range[%d]: %#llx:%#llx\n", is_shrink ? "shrink" : "extend",
|
|
last_range, (unsigned long long) range->start,
|
|
(unsigned long long) range->end);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t size_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
unsigned long long size;
|
|
|
|
device_lock(dev);
|
|
size = dev_dax_size(dev_dax);
|
|
device_unlock(dev);
|
|
|
|
return sprintf(buf, "%llu\n", size);
|
|
}
|
|
|
|
static bool alloc_is_aligned(struct dev_dax *dev_dax, resource_size_t size)
|
|
{
|
|
/*
|
|
* The minimum mapping granularity for a device instance is a
|
|
* single subsection, unless the arch says otherwise.
|
|
*/
|
|
return IS_ALIGNED(size, max_t(unsigned long, dev_dax->align, memremap_compat_align()));
|
|
}
|
|
|
|
static int dev_dax_shrink(struct dev_dax *dev_dax, resource_size_t size)
|
|
{
|
|
resource_size_t to_shrink = dev_dax_size(dev_dax) - size;
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
struct device *dev = &dev_dax->dev;
|
|
int i;
|
|
|
|
for (i = dev_dax->nr_range - 1; i >= 0; i--) {
|
|
struct range *range = &dev_dax->ranges[i].range;
|
|
struct dax_mapping *mapping = dev_dax->ranges[i].mapping;
|
|
struct resource *adjust = NULL, *res;
|
|
resource_size_t shrink;
|
|
|
|
shrink = min_t(u64, to_shrink, range_len(range));
|
|
if (shrink >= range_len(range)) {
|
|
devm_release_action(dax_region->dev,
|
|
unregister_dax_mapping, &mapping->dev);
|
|
trim_dev_dax_range(dev_dax);
|
|
to_shrink -= shrink;
|
|
if (!to_shrink)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
for_each_dax_region_resource(dax_region, res)
|
|
if (strcmp(res->name, dev_name(dev)) == 0
|
|
&& res->start == range->start) {
|
|
adjust = res;
|
|
break;
|
|
}
|
|
|
|
if (dev_WARN_ONCE(dev, !adjust || i != dev_dax->nr_range - 1,
|
|
"failed to find matching resource\n"))
|
|
return -ENXIO;
|
|
return adjust_dev_dax_range(dev_dax, adjust, range_len(range)
|
|
- shrink);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Only allow adjustments that preserve the relative pgoff of existing
|
|
* allocations. I.e. the dev_dax->ranges array is ordered by increasing pgoff.
|
|
*/
|
|
static bool adjust_ok(struct dev_dax *dev_dax, struct resource *res)
|
|
{
|
|
struct dev_dax_range *last;
|
|
int i;
|
|
|
|
if (dev_dax->nr_range == 0)
|
|
return false;
|
|
if (strcmp(res->name, dev_name(&dev_dax->dev)) != 0)
|
|
return false;
|
|
last = &dev_dax->ranges[dev_dax->nr_range - 1];
|
|
if (last->range.start != res->start || last->range.end != res->end)
|
|
return false;
|
|
for (i = 0; i < dev_dax->nr_range - 1; i++) {
|
|
struct dev_dax_range *dax_range = &dev_dax->ranges[i];
|
|
|
|
if (dax_range->pgoff > last->pgoff)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static ssize_t dev_dax_resize(struct dax_region *dax_region,
|
|
struct dev_dax *dev_dax, resource_size_t size)
|
|
{
|
|
resource_size_t avail = dax_region_avail_size(dax_region), to_alloc;
|
|
resource_size_t dev_size = dev_dax_size(dev_dax);
|
|
struct resource *region_res = &dax_region->res;
|
|
struct device *dev = &dev_dax->dev;
|
|
struct resource *res, *first;
|
|
resource_size_t alloc = 0;
|
|
int rc;
|
|
|
|
if (dev->driver)
|
|
return -EBUSY;
|
|
if (size == dev_size)
|
|
return 0;
|
|
if (size > dev_size && size - dev_size > avail)
|
|
return -ENOSPC;
|
|
if (size < dev_size)
|
|
return dev_dax_shrink(dev_dax, size);
|
|
|
|
to_alloc = size - dev_size;
|
|
if (dev_WARN_ONCE(dev, !alloc_is_aligned(dev_dax, to_alloc),
|
|
"resize of %pa misaligned\n", &to_alloc))
|
|
return -ENXIO;
|
|
|
|
/*
|
|
* Expand the device into the unused portion of the region. This
|
|
* may involve adjusting the end of an existing resource, or
|
|
* allocating a new resource.
|
|
*/
|
|
retry:
|
|
first = region_res->child;
|
|
if (!first)
|
|
return alloc_dev_dax_range(dev_dax, dax_region->res.start, to_alloc);
|
|
|
|
rc = -ENOSPC;
|
|
for (res = first; res; res = res->sibling) {
|
|
struct resource *next = res->sibling;
|
|
|
|
/* space at the beginning of the region */
|
|
if (res == first && res->start > dax_region->res.start) {
|
|
alloc = min(res->start - dax_region->res.start, to_alloc);
|
|
rc = alloc_dev_dax_range(dev_dax, dax_region->res.start, alloc);
|
|
break;
|
|
}
|
|
|
|
alloc = 0;
|
|
/* space between allocations */
|
|
if (next && next->start > res->end + 1)
|
|
alloc = min(next->start - (res->end + 1), to_alloc);
|
|
|
|
/* space at the end of the region */
|
|
if (!alloc && !next && res->end < region_res->end)
|
|
alloc = min(region_res->end - res->end, to_alloc);
|
|
|
|
if (!alloc)
|
|
continue;
|
|
|
|
if (adjust_ok(dev_dax, res)) {
|
|
rc = adjust_dev_dax_range(dev_dax, res, resource_size(res) + alloc);
|
|
break;
|
|
}
|
|
rc = alloc_dev_dax_range(dev_dax, res->end + 1, alloc);
|
|
break;
|
|
}
|
|
if (rc)
|
|
return rc;
|
|
to_alloc -= alloc;
|
|
if (to_alloc)
|
|
goto retry;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t size_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
ssize_t rc;
|
|
unsigned long long val;
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
|
|
rc = kstrtoull(buf, 0, &val);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (!alloc_is_aligned(dev_dax, val)) {
|
|
dev_dbg(dev, "%s: size: %lld misaligned\n", __func__, val);
|
|
return -EINVAL;
|
|
}
|
|
|
|
device_lock(dax_region->dev);
|
|
if (!dax_region->dev->driver) {
|
|
device_unlock(dax_region->dev);
|
|
return -ENXIO;
|
|
}
|
|
device_lock(dev);
|
|
rc = dev_dax_resize(dax_region, dev_dax, val);
|
|
device_unlock(dev);
|
|
device_unlock(dax_region->dev);
|
|
|
|
return rc == 0 ? len : rc;
|
|
}
|
|
static DEVICE_ATTR_RW(size);
|
|
|
|
static ssize_t range_parse(const char *opt, size_t len, struct range *range)
|
|
{
|
|
unsigned long long addr = 0;
|
|
char *start, *end, *str;
|
|
ssize_t rc = -EINVAL;
|
|
|
|
str = kstrdup(opt, GFP_KERNEL);
|
|
if (!str)
|
|
return rc;
|
|
|
|
end = str;
|
|
start = strsep(&end, "-");
|
|
if (!start || !end)
|
|
goto err;
|
|
|
|
rc = kstrtoull(start, 16, &addr);
|
|
if (rc)
|
|
goto err;
|
|
range->start = addr;
|
|
|
|
rc = kstrtoull(end, 16, &addr);
|
|
if (rc)
|
|
goto err;
|
|
range->end = addr;
|
|
|
|
err:
|
|
kfree(str);
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t mapping_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
size_t to_alloc;
|
|
struct range r;
|
|
ssize_t rc;
|
|
|
|
rc = range_parse(buf, len, &r);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = -ENXIO;
|
|
device_lock(dax_region->dev);
|
|
if (!dax_region->dev->driver) {
|
|
device_unlock(dax_region->dev);
|
|
return rc;
|
|
}
|
|
device_lock(dev);
|
|
|
|
to_alloc = range_len(&r);
|
|
if (alloc_is_aligned(dev_dax, to_alloc))
|
|
rc = alloc_dev_dax_range(dev_dax, r.start, to_alloc);
|
|
device_unlock(dev);
|
|
device_unlock(dax_region->dev);
|
|
|
|
return rc == 0 ? len : rc;
|
|
}
|
|
static DEVICE_ATTR_WO(mapping);
|
|
|
|
static ssize_t align_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
|
|
return sprintf(buf, "%d\n", dev_dax->align);
|
|
}
|
|
|
|
static ssize_t dev_dax_validate_align(struct dev_dax *dev_dax)
|
|
{
|
|
struct device *dev = &dev_dax->dev;
|
|
int i;
|
|
|
|
for (i = 0; i < dev_dax->nr_range; i++) {
|
|
size_t len = range_len(&dev_dax->ranges[i].range);
|
|
|
|
if (!alloc_is_aligned(dev_dax, len)) {
|
|
dev_dbg(dev, "%s: align %u invalid for range %d\n",
|
|
__func__, dev_dax->align, i);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t align_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
unsigned long val, align_save;
|
|
ssize_t rc;
|
|
|
|
rc = kstrtoul(buf, 0, &val);
|
|
if (rc)
|
|
return -ENXIO;
|
|
|
|
if (!dax_align_valid(val))
|
|
return -EINVAL;
|
|
|
|
device_lock(dax_region->dev);
|
|
if (!dax_region->dev->driver) {
|
|
device_unlock(dax_region->dev);
|
|
return -ENXIO;
|
|
}
|
|
|
|
device_lock(dev);
|
|
if (dev->driver) {
|
|
rc = -EBUSY;
|
|
goto out_unlock;
|
|
}
|
|
|
|
align_save = dev_dax->align;
|
|
dev_dax->align = val;
|
|
rc = dev_dax_validate_align(dev_dax);
|
|
if (rc)
|
|
dev_dax->align = align_save;
|
|
out_unlock:
|
|
device_unlock(dev);
|
|
device_unlock(dax_region->dev);
|
|
return rc == 0 ? len : rc;
|
|
}
|
|
static DEVICE_ATTR_RW(align);
|
|
|
|
static int dev_dax_target_node(struct dev_dax *dev_dax)
|
|
{
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
|
|
return dax_region->target_node;
|
|
}
|
|
|
|
static ssize_t target_node_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
|
|
return sprintf(buf, "%d\n", dev_dax_target_node(dev_dax));
|
|
}
|
|
static DEVICE_ATTR_RO(target_node);
|
|
|
|
static ssize_t resource_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
unsigned long long start;
|
|
|
|
if (dev_dax->nr_range < 1)
|
|
start = dax_region->res.start;
|
|
else
|
|
start = dev_dax->ranges[0].range.start;
|
|
|
|
return sprintf(buf, "%#llx\n", start);
|
|
}
|
|
static DEVICE_ATTR(resource, 0400, resource_show, NULL);
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
/*
|
|
* We only ever expect to handle device-dax instances, i.e. the
|
|
* @type argument to MODULE_ALIAS_DAX_DEVICE() is always zero
|
|
*/
|
|
return sprintf(buf, DAX_DEVICE_MODALIAS_FMT "\n", 0);
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static ssize_t numa_node_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", dev_to_node(dev));
|
|
}
|
|
static DEVICE_ATTR_RO(numa_node);
|
|
|
|
static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
|
|
if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0)
|
|
return 0;
|
|
if (a == &dev_attr_numa_node.attr && !IS_ENABLED(CONFIG_NUMA))
|
|
return 0;
|
|
if (a == &dev_attr_mapping.attr && is_static(dax_region))
|
|
return 0;
|
|
if ((a == &dev_attr_align.attr ||
|
|
a == &dev_attr_size.attr) && is_static(dax_region))
|
|
return 0444;
|
|
return a->mode;
|
|
}
|
|
|
|
static struct attribute *dev_dax_attributes[] = {
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_size.attr,
|
|
&dev_attr_mapping.attr,
|
|
&dev_attr_target_node.attr,
|
|
&dev_attr_align.attr,
|
|
&dev_attr_resource.attr,
|
|
&dev_attr_numa_node.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group dev_dax_attribute_group = {
|
|
.attrs = dev_dax_attributes,
|
|
.is_visible = dev_dax_visible,
|
|
};
|
|
|
|
static const struct attribute_group *dax_attribute_groups[] = {
|
|
&dev_dax_attribute_group,
|
|
NULL,
|
|
};
|
|
|
|
static void dev_dax_release(struct device *dev)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
struct dax_device *dax_dev = dev_dax->dax_dev;
|
|
|
|
put_dax(dax_dev);
|
|
free_dev_dax_id(dev_dax);
|
|
dax_region_put(dax_region);
|
|
kfree(dev_dax->pgmap);
|
|
kfree(dev_dax);
|
|
}
|
|
|
|
static const struct device_type dev_dax_type = {
|
|
.release = dev_dax_release,
|
|
.groups = dax_attribute_groups,
|
|
};
|
|
|
|
struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
|
|
{
|
|
struct dax_region *dax_region = data->dax_region;
|
|
struct device *parent = dax_region->dev;
|
|
struct dax_device *dax_dev;
|
|
struct dev_dax *dev_dax;
|
|
struct inode *inode;
|
|
struct device *dev;
|
|
int rc;
|
|
|
|
dev_dax = kzalloc(sizeof(*dev_dax), GFP_KERNEL);
|
|
if (!dev_dax)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (is_static(dax_region)) {
|
|
if (dev_WARN_ONCE(parent, data->id < 0,
|
|
"dynamic id specified to static region\n")) {
|
|
rc = -EINVAL;
|
|
goto err_id;
|
|
}
|
|
|
|
dev_dax->id = data->id;
|
|
} else {
|
|
if (dev_WARN_ONCE(parent, data->id >= 0,
|
|
"static id specified to dynamic region\n")) {
|
|
rc = -EINVAL;
|
|
goto err_id;
|
|
}
|
|
|
|
rc = ida_alloc(&dax_region->ida, GFP_KERNEL);
|
|
if (rc < 0)
|
|
goto err_id;
|
|
dev_dax->id = rc;
|
|
}
|
|
|
|
dev_dax->region = dax_region;
|
|
dev = &dev_dax->dev;
|
|
device_initialize(dev);
|
|
dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id);
|
|
|
|
rc = alloc_dev_dax_range(dev_dax, dax_region->res.start, data->size);
|
|
if (rc)
|
|
goto err_range;
|
|
|
|
if (data->pgmap) {
|
|
dev_WARN_ONCE(parent, !is_static(dax_region),
|
|
"custom dev_pagemap requires a static dax_region\n");
|
|
|
|
dev_dax->pgmap = kmemdup(data->pgmap,
|
|
sizeof(struct dev_pagemap), GFP_KERNEL);
|
|
if (!dev_dax->pgmap) {
|
|
rc = -ENOMEM;
|
|
goto err_pgmap;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* No 'host' or dax_operations since there is no access to this
|
|
* device outside of mmap of the resulting character device.
|
|
*/
|
|
dax_dev = alloc_dax(dev_dax, NULL, NULL, DAXDEV_F_SYNC);
|
|
if (IS_ERR(dax_dev)) {
|
|
rc = PTR_ERR(dax_dev);
|
|
goto err_alloc_dax;
|
|
}
|
|
|
|
/* a device_dax instance is dead while the driver is not attached */
|
|
kill_dax(dax_dev);
|
|
|
|
dev_dax->dax_dev = dax_dev;
|
|
dev_dax->target_node = dax_region->target_node;
|
|
dev_dax->align = dax_region->align;
|
|
ida_init(&dev_dax->ida);
|
|
kref_get(&dax_region->kref);
|
|
|
|
inode = dax_inode(dax_dev);
|
|
dev->devt = inode->i_rdev;
|
|
if (data->subsys == DEV_DAX_BUS)
|
|
dev->bus = &dax_bus_type;
|
|
else
|
|
dev->class = dax_class;
|
|
dev->parent = parent;
|
|
dev->type = &dev_dax_type;
|
|
|
|
rc = device_add(dev);
|
|
if (rc) {
|
|
kill_dev_dax(dev_dax);
|
|
put_device(dev);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
rc = devm_add_action_or_reset(dax_region->dev, unregister_dev_dax, dev);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
|
|
/* register mapping device for the initial allocation range */
|
|
if (dev_dax->nr_range && range_len(&dev_dax->ranges[0].range)) {
|
|
rc = devm_register_dax_mapping(dev_dax, 0);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
return dev_dax;
|
|
|
|
err_alloc_dax:
|
|
kfree(dev_dax->pgmap);
|
|
err_pgmap:
|
|
free_dev_dax_ranges(dev_dax);
|
|
err_range:
|
|
free_dev_dax_id(dev_dax);
|
|
err_id:
|
|
kfree(dev_dax);
|
|
|
|
return ERR_PTR(rc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_create_dev_dax);
|
|
|
|
static int match_always_count;
|
|
|
|
int __dax_driver_register(struct dax_device_driver *dax_drv,
|
|
struct module *module, const char *mod_name)
|
|
{
|
|
struct device_driver *drv = &dax_drv->drv;
|
|
int rc = 0;
|
|
|
|
/*
|
|
* dax_bus_probe() calls dax_drv->probe() unconditionally.
|
|
* So better be safe than sorry and ensure it is provided.
|
|
*/
|
|
if (!dax_drv->probe)
|
|
return -EINVAL;
|
|
|
|
INIT_LIST_HEAD(&dax_drv->ids);
|
|
drv->owner = module;
|
|
drv->name = mod_name;
|
|
drv->mod_name = mod_name;
|
|
drv->bus = &dax_bus_type;
|
|
|
|
/* there can only be one default driver */
|
|
mutex_lock(&dax_bus_lock);
|
|
match_always_count += dax_drv->match_always;
|
|
if (match_always_count > 1) {
|
|
match_always_count--;
|
|
WARN_ON(1);
|
|
rc = -EINVAL;
|
|
}
|
|
mutex_unlock(&dax_bus_lock);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = driver_register(drv);
|
|
if (rc && dax_drv->match_always) {
|
|
mutex_lock(&dax_bus_lock);
|
|
match_always_count -= dax_drv->match_always;
|
|
mutex_unlock(&dax_bus_lock);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__dax_driver_register);
|
|
|
|
void dax_driver_unregister(struct dax_device_driver *dax_drv)
|
|
{
|
|
struct device_driver *drv = &dax_drv->drv;
|
|
struct dax_id *dax_id, *_id;
|
|
|
|
mutex_lock(&dax_bus_lock);
|
|
match_always_count -= dax_drv->match_always;
|
|
list_for_each_entry_safe(dax_id, _id, &dax_drv->ids, list) {
|
|
list_del(&dax_id->list);
|
|
kfree(dax_id);
|
|
}
|
|
mutex_unlock(&dax_bus_lock);
|
|
driver_unregister(drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dax_driver_unregister);
|
|
|
|
int __init dax_bus_init(void)
|
|
{
|
|
int rc;
|
|
|
|
if (IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)) {
|
|
dax_class = class_create(THIS_MODULE, "dax");
|
|
if (IS_ERR(dax_class))
|
|
return PTR_ERR(dax_class);
|
|
}
|
|
|
|
rc = bus_register(&dax_bus_type);
|
|
if (rc)
|
|
class_destroy(dax_class);
|
|
return rc;
|
|
}
|
|
|
|
void __exit dax_bus_exit(void)
|
|
{
|
|
bus_unregister(&dax_bus_type);
|
|
class_destroy(dax_class);
|
|
}
|