2017-07-13 07:58:21 +07:00
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// 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/device.h>
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#include <linux/slab.h>
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#include <linux/dax.h>
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#include "dax-private.h"
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#include "bus.h"
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2017-07-13 07:58:21 +07:00
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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 int dax_bus_match(struct device *dev, struct device_driver *drv);
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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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};
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static int dax_bus_match(struct device *dev, struct device_driver *drv)
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{
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/*
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* The drivers that can register on the 'dax' bus are private to
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* drivers/dax/ so any device and driver on the bus always
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* match.
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*/
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return 1;
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}
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2017-07-13 07:58:21 +07:00
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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 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 DEVICE_ATTR_RO(align);
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static struct attribute *dax_region_attributes[] = {
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&dev_attr_region_size.attr,
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&dev_attr_align.attr,
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&dev_attr_id.attr,
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NULL,
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};
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static const struct attribute_group dax_region_attribute_group = {
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.name = "dax_region",
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.attrs = dax_region_attributes,
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};
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static const struct attribute_group *dax_region_attribute_groups[] = {
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&dax_region_attribute_group,
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NULL,
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};
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static void dax_region_free(struct kref *kref)
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{
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struct dax_region *dax_region;
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dax_region = container_of(kref, struct dax_region, kref);
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kfree(dax_region);
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}
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void dax_region_put(struct dax_region *dax_region)
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{
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kref_put(&dax_region->kref, dax_region_free);
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}
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EXPORT_SYMBOL_GPL(dax_region_put);
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static void dax_region_unregister(void *region)
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{
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struct dax_region *dax_region = region;
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sysfs_remove_groups(&dax_region->dev->kobj,
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dax_region_attribute_groups);
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dax_region_put(dax_region);
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}
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struct dax_region *alloc_dax_region(struct device *parent, int region_id,
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struct resource *res, unsigned int align,
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unsigned long pfn_flags)
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{
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struct dax_region *dax_region;
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/*
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* The DAX core assumes that it can store its private data in
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* parent->driver_data. This WARN is a reminder / safeguard for
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* developers of device-dax drivers.
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*/
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if (dev_get_drvdata(parent)) {
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dev_WARN(parent, "dax core failed to setup private data\n");
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return NULL;
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}
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if (!IS_ALIGNED(res->start, align)
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|| !IS_ALIGNED(resource_size(res), align))
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return NULL;
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dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL);
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if (!dax_region)
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return NULL;
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dev_set_drvdata(parent, dax_region);
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memcpy(&dax_region->res, res, sizeof(*res));
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dax_region->pfn_flags = pfn_flags;
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kref_init(&dax_region->kref);
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dax_region->id = region_id;
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dax_region->align = align;
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dax_region->dev = parent;
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if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) {
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kfree(dax_region);
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return NULL;
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}
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kref_get(&dax_region->kref);
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if (devm_add_action_or_reset(parent, dax_region_unregister, dax_region))
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return NULL;
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return dax_region;
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}
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EXPORT_SYMBOL_GPL(alloc_dax_region);
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static ssize_t size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dev_dax *dev_dax = to_dev_dax(dev);
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unsigned long long size = resource_size(&dev_dax->region->res);
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return sprintf(buf, "%llu\n", size);
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}
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static DEVICE_ATTR_RO(size);
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static struct attribute *dev_dax_attributes[] = {
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&dev_attr_size.attr,
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NULL,
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};
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static const struct attribute_group dev_dax_attribute_group = {
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.attrs = dev_dax_attributes,
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};
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2017-07-13 07:58:21 +07:00
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static const struct attribute_group *dax_attribute_groups[] = {
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2017-07-13 07:58:21 +07:00
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&dev_dax_attribute_group,
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NULL,
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};
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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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2017-07-13 07:58:21 +07:00
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static void dev_dax_release(struct device *dev)
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2017-07-13 07:58:21 +07:00
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{
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struct dev_dax *dev_dax = to_dev_dax(dev);
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2017-07-13 07:58:21 +07:00
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struct dax_region *dax_region = dev_dax->region;
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2017-07-13 07:58:21 +07:00
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struct dax_device *dax_dev = dev_dax->dax_dev;
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2017-07-13 07:58:21 +07:00
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dax_region_put(dax_region);
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put_dax(dax_dev);
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kfree(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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2017-07-13 07:58:21 +07:00
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kill_dev_dax(dev_dax);
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2017-07-13 07:58:21 +07:00
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device_del(dev);
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2017-07-13 07:58:21 +07:00
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put_device(dev);
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}
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2017-07-13 07:58:21 +07:00
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struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, int id)
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{
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struct device *parent = dax_region->dev;
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struct dax_device *dax_dev;
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struct dev_dax *dev_dax;
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struct inode *inode;
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struct device *dev;
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int rc = -ENOMEM;
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if (id < 0)
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return ERR_PTR(-EINVAL);
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dev_dax = kzalloc(sizeof(*dev_dax), GFP_KERNEL);
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if (!dev_dax)
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return ERR_PTR(-ENOMEM);
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/*
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* No 'host' or dax_operations since there is no access to this
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* device outside of mmap of the resulting character device.
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*/
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dax_dev = alloc_dax(dev_dax, NULL, NULL);
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if (!dax_dev)
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goto err;
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/* a device_dax instance is dead while the driver is not attached */
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kill_dax(dax_dev);
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/* from here on we're committed to teardown via dax_dev_release() */
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dev = &dev_dax->dev;
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device_initialize(dev);
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dev_dax->dax_dev = dax_dev;
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dev_dax->region = dax_region;
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kref_get(&dax_region->kref);
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inode = dax_inode(dax_dev);
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dev->devt = inode->i_rdev;
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dev->bus = &dax_bus_type;
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dev->parent = parent;
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dev->groups = dax_attribute_groups;
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dev->release = dev_dax_release;
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dev_set_name(dev, "dax%d.%d", dax_region->id, id);
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rc = device_add(dev);
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if (rc) {
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kill_dev_dax(dev_dax);
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put_device(dev);
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return ERR_PTR(rc);
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}
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rc = devm_add_action_or_reset(dax_region->dev, unregister_dev_dax, dev);
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if (rc)
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return ERR_PTR(rc);
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return dev_dax;
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err:
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kfree(dev_dax);
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return ERR_PTR(rc);
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}
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EXPORT_SYMBOL_GPL(devm_create_dev_dax);
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int __dax_driver_register(struct device_driver *drv,
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struct module *module, const char *mod_name)
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{
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drv->owner = module;
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drv->name = mod_name;
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drv->mod_name = mod_name;
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drv->bus = &dax_bus_type;
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return driver_register(drv);
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}
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EXPORT_SYMBOL_GPL(__dax_driver_register);
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int __init dax_bus_init(void)
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{
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return bus_register(&dax_bus_type);
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}
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void __exit dax_bus_exit(void)
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{
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bus_unregister(&dax_bus_type);
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}
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