ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/dax/Kconfig b/marvell/linux/drivers/dax/Kconfig
new file mode 100644
index 0000000..f33c73e
--- /dev/null
+++ b/marvell/linux/drivers/dax/Kconfig
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config DAX_DRIVER
+ select DAX
+ bool
+
+menuconfig DAX
+ tristate "DAX: direct access to differentiated memory"
+ select SRCU
+ default m if NVDIMM_DAX
+
+if DAX
+
+config DEV_DAX
+ tristate "Device DAX: direct access mapping device"
+ depends on TRANSPARENT_HUGEPAGE
+ help
+ Support raw access to differentiated (persistence, bandwidth,
+ latency...) memory via an mmap(2) capable character
+ device. Platform firmware or a device driver may identify a
+ platform memory resource that is differentiated from the
+ baseline memory pool. Mappings of a /dev/daxX.Y device impose
+ restrictions that make the mapping behavior deterministic.
+
+config DEV_DAX_PMEM
+ tristate "PMEM DAX: direct access to persistent memory"
+ depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX
+ default DEV_DAX
+ help
+ Support raw access to persistent memory. Note that this
+ driver consumes memory ranges allocated and exported by the
+ libnvdimm sub-system.
+
+ Say M if unsure
+
+config DEV_DAX_KMEM
+ tristate "KMEM DAX: volatile-use of persistent memory"
+ default DEV_DAX
+ depends on DEV_DAX
+ depends on MEMORY_HOTPLUG # for add_memory() and friends
+ help
+ Support access to persistent memory as if it were RAM. This
+ allows easier use of persistent memory by unmodified
+ applications.
+
+ To use this feature, a DAX device must be unbound from the
+ device_dax driver (PMEM DAX) and bound to this kmem driver
+ on each boot.
+
+ Say N if unsure.
+
+config DEV_DAX_PMEM_COMPAT
+ tristate "PMEM DAX: support the deprecated /sys/class/dax interface"
+ depends on m && DEV_DAX_PMEM=m
+ default DEV_DAX_PMEM
+ help
+ Older versions of the libdaxctl library expect to find all
+ device-dax instances under /sys/class/dax. If libdaxctl in
+ your distribution is older than v58 say M, otherwise say N.
+
+endif
diff --git a/marvell/linux/drivers/dax/Makefile b/marvell/linux/drivers/dax/Makefile
new file mode 100644
index 0000000..81f7d54
--- /dev/null
+++ b/marvell/linux/drivers/dax/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_DAX) += dax.o
+obj-$(CONFIG_DEV_DAX) += device_dax.o
+obj-$(CONFIG_DEV_DAX_KMEM) += kmem.o
+
+dax-y := super.o
+dax-y += bus.o
+device_dax-y := device.o
+
+obj-y += pmem/
diff --git a/marvell/linux/drivers/dax/bus.c b/marvell/linux/drivers/dax/bus.c
new file mode 100644
index 0000000..eccdda1
--- /dev/null
+++ b/marvell/linux/drivers/dax/bus.c
@@ -0,0 +1,522 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2017-2018 Intel Corporation. All rights reserved. */
+#include <linux/memremap.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dax.h>
+#include "dax-private.h"
+#include "bus.h"
+
+static struct class *dax_class;
+
+static DEFINE_MUTEX(dax_bus_lock);
+
+#define DAX_NAME_LEN 30
+struct dax_id {
+ struct list_head list;
+ char dev_name[DAX_NAME_LEN];
+};
+
+static int dax_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ /*
+ * We only ever expect to handle device-dax instances, i.e. the
+ * @type argument to MODULE_ALIAS_DAX_DEVICE() is always zero
+ */
+ return add_uevent_var(env, "MODALIAS=" DAX_DEVICE_MODALIAS_FMT, 0);
+}
+
+static struct dax_device_driver *to_dax_drv(struct device_driver *drv)
+{
+ return container_of(drv, struct dax_device_driver, drv);
+}
+
+static struct dax_id *__dax_match_id(struct dax_device_driver *dax_drv,
+ const char *dev_name)
+{
+ struct dax_id *dax_id;
+
+ lockdep_assert_held(&dax_bus_lock);
+
+ list_for_each_entry(dax_id, &dax_drv->ids, list)
+ if (sysfs_streq(dax_id->dev_name, dev_name))
+ return dax_id;
+ return NULL;
+}
+
+static int dax_match_id(struct dax_device_driver *dax_drv, struct device *dev)
+{
+ int match;
+
+ mutex_lock(&dax_bus_lock);
+ match = !!__dax_match_id(dax_drv, dev_name(dev));
+ mutex_unlock(&dax_bus_lock);
+
+ return match;
+}
+
+enum id_action {
+ ID_REMOVE,
+ ID_ADD,
+};
+
+static ssize_t do_id_store(struct device_driver *drv, const char *buf,
+ size_t count, enum id_action action)
+{
+ struct dax_device_driver *dax_drv = to_dax_drv(drv);
+ unsigned int region_id, id;
+ char devname[DAX_NAME_LEN];
+ struct dax_id *dax_id;
+ ssize_t rc = count;
+ int fields;
+
+ fields = sscanf(buf, "dax%d.%d", ®ion_id, &id);
+ if (fields != 2)
+ return -EINVAL;
+ sprintf(devname, "dax%d.%d", region_id, id);
+ if (!sysfs_streq(buf, devname))
+ return -EINVAL;
+
+ mutex_lock(&dax_bus_lock);
+ dax_id = __dax_match_id(dax_drv, buf);
+ if (!dax_id) {
+ if (action == ID_ADD) {
+ dax_id = kzalloc(sizeof(*dax_id), GFP_KERNEL);
+ if (dax_id) {
+ strncpy(dax_id->dev_name, buf, DAX_NAME_LEN);
+ list_add(&dax_id->list, &dax_drv->ids);
+ } else
+ rc = -ENOMEM;
+ } else
+ /* nothing to remove */;
+ } else if (action == ID_REMOVE) {
+ list_del(&dax_id->list);
+ kfree(dax_id);
+ } else
+ /* dax_id already added */;
+ mutex_unlock(&dax_bus_lock);
+
+ if (rc < 0)
+ return rc;
+ if (action == ID_ADD)
+ rc = driver_attach(drv);
+ if (rc)
+ return rc;
+ return count;
+}
+
+static ssize_t new_id_store(struct device_driver *drv, const char *buf,
+ size_t count)
+{
+ return do_id_store(drv, buf, count, ID_ADD);
+}
+static DRIVER_ATTR_WO(new_id);
+
+static ssize_t remove_id_store(struct device_driver *drv, const char *buf,
+ size_t count)
+{
+ return do_id_store(drv, buf, count, ID_REMOVE);
+}
+static DRIVER_ATTR_WO(remove_id);
+
+static struct attribute *dax_drv_attrs[] = {
+ &driver_attr_new_id.attr,
+ &driver_attr_remove_id.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(dax_drv);
+
+static int dax_bus_match(struct device *dev, struct device_driver *drv);
+
+static struct bus_type dax_bus_type = {
+ .name = "dax",
+ .uevent = dax_bus_uevent,
+ .match = dax_bus_match,
+ .drv_groups = dax_drv_groups,
+};
+
+static int dax_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct dax_device_driver *dax_drv = to_dax_drv(drv);
+
+ /*
+ * All but the 'device-dax' driver, which has 'match_always'
+ * set, requires an exact id match.
+ */
+ if (dax_drv->match_always)
+ return 1;
+
+ return dax_match_id(dax_drv, dev);
+}
+
+/*
+ * Rely on the fact that drvdata is set before the attributes are
+ * registered, and that the attributes are unregistered before drvdata
+ * is cleared to assume that drvdata is always valid.
+ */
+static ssize_t id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dax_region *dax_region = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", dax_region->id);
+}
+static DEVICE_ATTR_RO(id);
+
+static ssize_t region_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dax_region *dax_region = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%llu\n", (unsigned long long)
+ resource_size(&dax_region->res));
+}
+static struct device_attribute dev_attr_region_size = __ATTR(size, 0444,
+ region_size_show, NULL);
+
+static ssize_t align_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dax_region *dax_region = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", dax_region->align);
+}
+static DEVICE_ATTR_RO(align);
+
+static struct attribute *dax_region_attributes[] = {
+ &dev_attr_region_size.attr,
+ &dev_attr_align.attr,
+ &dev_attr_id.attr,
+ NULL,
+};
+
+static const struct attribute_group dax_region_attribute_group = {
+ .name = "dax_region",
+ .attrs = dax_region_attributes,
+};
+
+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 resource *res, int target_node, unsigned int align,
+ unsigned long long pfn_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(res->start, align)
+ || !IS_ALIGNED(resource_size(res), align))
+ return NULL;
+
+ dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL);
+ if (!dax_region)
+ return NULL;
+
+ dev_set_drvdata(parent, dax_region);
+ memcpy(&dax_region->res, res, sizeof(*res));
+ dax_region->pfn_flags = pfn_flags;
+ kref_init(&dax_region->kref);
+ dax_region->id = region_id;
+ dax_region->align = align;
+ dax_region->dev = parent;
+ dax_region->target_node = target_node;
+ 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 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 = resource_size(&dev_dax->region->res);
+
+ return sprintf(buf, "%llu\n", size);
+}
+static DEVICE_ATTR_RO(size);
+
+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 unsigned long long dev_dax_resource(struct dev_dax *dev_dax)
+{
+ struct dax_region *dax_region = dev_dax->region;
+
+ return dax_region->res.start;
+}
+
+static ssize_t resource_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dev_dax *dev_dax = to_dev_dax(dev);
+
+ return sprintf(buf, "%#llx\n", dev_dax_resource(dev_dax));
+}
+static DEVICE_ATTR_RO(resource);
+
+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 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);
+
+ if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0)
+ return 0;
+ if (a == &dev_attr_resource.attr)
+ return 0400;
+ return a->mode;
+}
+
+static struct attribute *dev_dax_attributes[] = {
+ &dev_attr_modalias.attr,
+ &dev_attr_size.attr,
+ &dev_attr_target_node.attr,
+ &dev_attr_resource.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,
+};
+
+void kill_dev_dax(struct dev_dax *dev_dax)
+{
+ struct dax_device *dax_dev = dev_dax->dax_dev;
+ struct inode *inode = dax_inode(dax_dev);
+
+ kill_dax(dax_dev);
+ unmap_mapping_range(inode->i_mapping, 0, 0, 1);
+}
+EXPORT_SYMBOL_GPL(kill_dev_dax);
+
+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;
+
+ dax_region_put(dax_region);
+ put_dax(dax_dev);
+ kfree(dev_dax);
+}
+
+static void unregister_dev_dax(void *dev)
+{
+ struct dev_dax *dev_dax = to_dev_dax(dev);
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ kill_dev_dax(dev_dax);
+ device_del(dev);
+ put_device(dev);
+}
+
+struct dev_dax *__devm_create_dev_dax(struct dax_region *dax_region, int id,
+ struct dev_pagemap *pgmap, enum dev_dax_subsys subsys)
+{
+ struct device *parent = dax_region->dev;
+ struct dax_device *dax_dev;
+ struct dev_dax *dev_dax;
+ struct inode *inode;
+ struct device *dev;
+ int rc = -ENOMEM;
+
+ if (id < 0)
+ return ERR_PTR(-EINVAL);
+
+ dev_dax = kzalloc(sizeof(*dev_dax), GFP_KERNEL);
+ if (!dev_dax)
+ return ERR_PTR(-ENOMEM);
+
+ memcpy(&dev_dax->pgmap, pgmap, sizeof(*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 (!dax_dev)
+ goto err;
+
+ /* a device_dax instance is dead while the driver is not attached */
+ kill_dax(dax_dev);
+
+ /* from here on we're committed to teardown via dax_dev_release() */
+ dev = &dev_dax->dev;
+ device_initialize(dev);
+
+ dev_dax->dax_dev = dax_dev;
+ dev_dax->region = dax_region;
+ dev_dax->target_node = dax_region->target_node;
+ kref_get(&dax_region->kref);
+
+ inode = dax_inode(dax_dev);
+ dev->devt = inode->i_rdev;
+ if (subsys == DEV_DAX_BUS)
+ dev->bus = &dax_bus_type;
+ else
+ dev->class = dax_class;
+ dev->parent = parent;
+ dev->groups = dax_attribute_groups;
+ dev->release = dev_dax_release;
+ dev_set_name(dev, "dax%d.%d", dax_region->id, id);
+
+ 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);
+
+ return dev_dax;
+
+ err:
+ 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;
+
+ 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;
+ return driver_register(drv);
+}
+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);
+}
diff --git a/marvell/linux/drivers/dax/bus.h b/marvell/linux/drivers/dax/bus.h
new file mode 100644
index 0000000..9e4eba6
--- /dev/null
+++ b/marvell/linux/drivers/dax/bus.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
+#ifndef __DAX_BUS_H__
+#define __DAX_BUS_H__
+#include <linux/device.h>
+
+struct dev_dax;
+struct resource;
+struct dax_device;
+struct dax_region;
+void dax_region_put(struct dax_region *dax_region);
+struct dax_region *alloc_dax_region(struct device *parent, int region_id,
+ struct resource *res, int target_node, unsigned int align,
+ unsigned long long flags);
+
+enum dev_dax_subsys {
+ DEV_DAX_BUS,
+ DEV_DAX_CLASS,
+};
+
+struct dev_dax *__devm_create_dev_dax(struct dax_region *dax_region, int id,
+ struct dev_pagemap *pgmap, enum dev_dax_subsys subsys);
+
+static inline struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
+ int id, struct dev_pagemap *pgmap)
+{
+ return __devm_create_dev_dax(dax_region, id, pgmap, DEV_DAX_BUS);
+}
+
+/* to be deleted when DEV_DAX_CLASS is removed */
+struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys);
+
+struct dax_device_driver {
+ struct device_driver drv;
+ struct list_head ids;
+ int match_always;
+};
+
+int __dax_driver_register(struct dax_device_driver *dax_drv,
+ struct module *module, const char *mod_name);
+#define dax_driver_register(driver) \
+ __dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
+void dax_driver_unregister(struct dax_device_driver *dax_drv);
+void kill_dev_dax(struct dev_dax *dev_dax);
+
+#if IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)
+int dev_dax_probe(struct device *dev);
+#endif
+
+/*
+ * While run_dax() is potentially a generic operation that could be
+ * defined in include/linux/dax.h we don't want to grow any users
+ * outside of drivers/dax/
+ */
+void run_dax(struct dax_device *dax_dev);
+
+#define MODULE_ALIAS_DAX_DEVICE(type) \
+ MODULE_ALIAS("dax:t" __stringify(type) "*")
+#define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
+
+#endif /* __DAX_BUS_H__ */
diff --git a/marvell/linux/drivers/dax/dax-private.h b/marvell/linux/drivers/dax/dax-private.h
new file mode 100644
index 0000000..3107ce8
--- /dev/null
+++ b/marvell/linux/drivers/dax/dax-private.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright(c) 2016 Intel Corporation. All rights reserved.
+ */
+#ifndef __DAX_PRIVATE_H__
+#define __DAX_PRIVATE_H__
+
+#include <linux/device.h>
+#include <linux/cdev.h>
+
+/* private routines between core files */
+struct dax_device;
+struct dax_device *inode_dax(struct inode *inode);
+struct inode *dax_inode(struct dax_device *dax_dev);
+int dax_bus_init(void);
+void dax_bus_exit(void);
+
+/**
+ * struct dax_region - mapping infrastructure for dax devices
+ * @id: kernel-wide unique region for a memory range
+ * @target_node: effective numa node if this memory range is onlined
+ * @kref: to pin while other agents have a need to do lookups
+ * @dev: parent device backing this region
+ * @align: allocation and mapping alignment for child dax devices
+ * @res: physical address range of the region
+ * @pfn_flags: identify whether the pfns are paged back or not
+ */
+struct dax_region {
+ int id;
+ int target_node;
+ struct kref kref;
+ struct device *dev;
+ unsigned int align;
+ struct resource res;
+ unsigned long long pfn_flags;
+};
+
+/**
+ * struct dev_dax - instance data for a subdivision of a dax region, and
+ * data while the device is activated in the driver.
+ * @region - parent region
+ * @dax_dev - core dax functionality
+ * @target_node: effective numa node if dev_dax memory range is onlined
+ * @dev - device core
+ * @pgmap - pgmap for memmap setup / lifetime (driver owned)
+ * @dax_mem_res: physical address range of hotadded DAX memory
+ */
+struct dev_dax {
+ struct dax_region *region;
+ struct dax_device *dax_dev;
+ int target_node;
+ struct device dev;
+ struct dev_pagemap pgmap;
+ struct resource *dax_kmem_res;
+};
+
+static inline struct dev_dax *to_dev_dax(struct device *dev)
+{
+ return container_of(dev, struct dev_dax, dev);
+}
+#endif
diff --git a/marvell/linux/drivers/dax/device.c b/marvell/linux/drivers/dax/device.c
new file mode 100644
index 0000000..4c0af2e
--- /dev/null
+++ b/marvell/linux/drivers/dax/device.c
@@ -0,0 +1,487 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2016-2018 Intel Corporation. All rights reserved. */
+#include <linux/memremap.h>
+#include <linux/pagemap.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/pfn_t.h>
+#include <linux/cdev.h>
+#include <linux/slab.h>
+#include <linux/dax.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include "dax-private.h"
+#include "bus.h"
+
+static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
+ const char *func)
+{
+ struct dax_region *dax_region = dev_dax->region;
+ struct device *dev = &dev_dax->dev;
+ unsigned long mask;
+
+ if (!dax_alive(dev_dax->dax_dev))
+ return -ENXIO;
+
+ /* prevent private mappings from being established */
+ if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
+ dev_info_ratelimited(dev,
+ "%s: %s: fail, attempted private mapping\n",
+ current->comm, func);
+ return -EINVAL;
+ }
+
+ mask = dax_region->align - 1;
+ if (vma->vm_start & mask || vma->vm_end & mask) {
+ dev_info_ratelimited(dev,
+ "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
+ current->comm, func, vma->vm_start, vma->vm_end,
+ mask);
+ return -EINVAL;
+ }
+
+ if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV
+ && (vma->vm_flags & VM_DONTCOPY) == 0) {
+ dev_info_ratelimited(dev,
+ "%s: %s: fail, dax range requires MADV_DONTFORK\n",
+ current->comm, func);
+ return -EINVAL;
+ }
+
+ if (!vma_is_dax(vma)) {
+ dev_info_ratelimited(dev,
+ "%s: %s: fail, vma is not DAX capable\n",
+ current->comm, func);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* see "strong" declaration in tools/testing/nvdimm/dax-dev.c */
+__weak phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
+ unsigned long size)
+{
+ struct resource *res = &dev_dax->region->res;
+ phys_addr_t phys;
+
+ phys = pgoff * PAGE_SIZE + res->start;
+ if (phys >= res->start && phys <= res->end) {
+ if (phys + size - 1 <= res->end)
+ return phys;
+ }
+
+ return -1;
+}
+
+static vm_fault_t __dev_dax_pte_fault(struct dev_dax *dev_dax,
+ struct vm_fault *vmf, pfn_t *pfn)
+{
+ struct device *dev = &dev_dax->dev;
+ struct dax_region *dax_region;
+ phys_addr_t phys;
+ unsigned int fault_size = PAGE_SIZE;
+
+ if (check_vma(dev_dax, vmf->vma, __func__))
+ return VM_FAULT_SIGBUS;
+
+ dax_region = dev_dax->region;
+ if (dax_region->align > PAGE_SIZE) {
+ dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
+ dax_region->align, fault_size);
+ return VM_FAULT_SIGBUS;
+ }
+
+ if (fault_size != dax_region->align)
+ return VM_FAULT_SIGBUS;
+
+ phys = dax_pgoff_to_phys(dev_dax, vmf->pgoff, PAGE_SIZE);
+ if (phys == -1) {
+ dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", vmf->pgoff);
+ return VM_FAULT_SIGBUS;
+ }
+
+ *pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
+
+ return vmf_insert_mixed(vmf->vma, vmf->address, *pfn);
+}
+
+static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax,
+ struct vm_fault *vmf, pfn_t *pfn)
+{
+ unsigned long pmd_addr = vmf->address & PMD_MASK;
+ struct device *dev = &dev_dax->dev;
+ struct dax_region *dax_region;
+ phys_addr_t phys;
+ pgoff_t pgoff;
+ unsigned int fault_size = PMD_SIZE;
+
+ if (check_vma(dev_dax, vmf->vma, __func__))
+ return VM_FAULT_SIGBUS;
+
+ dax_region = dev_dax->region;
+ if (dax_region->align > PMD_SIZE) {
+ dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
+ dax_region->align, fault_size);
+ return VM_FAULT_SIGBUS;
+ }
+
+ /* dax pmd mappings require pfn_t_devmap() */
+ if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) {
+ dev_dbg(dev, "region lacks devmap flags\n");
+ return VM_FAULT_SIGBUS;
+ }
+
+ if (fault_size < dax_region->align)
+ return VM_FAULT_SIGBUS;
+ else if (fault_size > dax_region->align)
+ return VM_FAULT_FALLBACK;
+
+ /* if we are outside of the VMA */
+ if (pmd_addr < vmf->vma->vm_start ||
+ (pmd_addr + PMD_SIZE) > vmf->vma->vm_end)
+ return VM_FAULT_SIGBUS;
+
+ pgoff = linear_page_index(vmf->vma, pmd_addr);
+ phys = dax_pgoff_to_phys(dev_dax, pgoff, PMD_SIZE);
+ if (phys == -1) {
+ dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", pgoff);
+ return VM_FAULT_SIGBUS;
+ }
+
+ *pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
+
+ return vmf_insert_pfn_pmd(vmf, *pfn, vmf->flags & FAULT_FLAG_WRITE);
+}
+
+#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
+static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
+ struct vm_fault *vmf, pfn_t *pfn)
+{
+ unsigned long pud_addr = vmf->address & PUD_MASK;
+ struct device *dev = &dev_dax->dev;
+ struct dax_region *dax_region;
+ phys_addr_t phys;
+ pgoff_t pgoff;
+ unsigned int fault_size = PUD_SIZE;
+
+
+ if (check_vma(dev_dax, vmf->vma, __func__))
+ return VM_FAULT_SIGBUS;
+
+ dax_region = dev_dax->region;
+ if (dax_region->align > PUD_SIZE) {
+ dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
+ dax_region->align, fault_size);
+ return VM_FAULT_SIGBUS;
+ }
+
+ /* dax pud mappings require pfn_t_devmap() */
+ if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) {
+ dev_dbg(dev, "region lacks devmap flags\n");
+ return VM_FAULT_SIGBUS;
+ }
+
+ if (fault_size < dax_region->align)
+ return VM_FAULT_SIGBUS;
+ else if (fault_size > dax_region->align)
+ return VM_FAULT_FALLBACK;
+
+ /* if we are outside of the VMA */
+ if (pud_addr < vmf->vma->vm_start ||
+ (pud_addr + PUD_SIZE) > vmf->vma->vm_end)
+ return VM_FAULT_SIGBUS;
+
+ pgoff = linear_page_index(vmf->vma, pud_addr);
+ phys = dax_pgoff_to_phys(dev_dax, pgoff, PUD_SIZE);
+ if (phys == -1) {
+ dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", pgoff);
+ return VM_FAULT_SIGBUS;
+ }
+
+ *pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
+
+ return vmf_insert_pfn_pud(vmf, *pfn, vmf->flags & FAULT_FLAG_WRITE);
+}
+#else
+static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
+ struct vm_fault *vmf, pfn_t *pfn)
+{
+ return VM_FAULT_FALLBACK;
+}
+#endif /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
+
+static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf,
+ enum page_entry_size pe_size)
+{
+ struct file *filp = vmf->vma->vm_file;
+ unsigned long fault_size;
+ vm_fault_t rc = VM_FAULT_SIGBUS;
+ int id;
+ pfn_t pfn;
+ struct dev_dax *dev_dax = filp->private_data;
+
+ dev_dbg(&dev_dax->dev, "%s: %s (%#lx - %#lx) size = %d\n", current->comm,
+ (vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read",
+ vmf->vma->vm_start, vmf->vma->vm_end, pe_size);
+
+ id = dax_read_lock();
+ switch (pe_size) {
+ case PE_SIZE_PTE:
+ fault_size = PAGE_SIZE;
+ rc = __dev_dax_pte_fault(dev_dax, vmf, &pfn);
+ break;
+ case PE_SIZE_PMD:
+ fault_size = PMD_SIZE;
+ rc = __dev_dax_pmd_fault(dev_dax, vmf, &pfn);
+ break;
+ case PE_SIZE_PUD:
+ fault_size = PUD_SIZE;
+ rc = __dev_dax_pud_fault(dev_dax, vmf, &pfn);
+ break;
+ default:
+ rc = VM_FAULT_SIGBUS;
+ }
+
+ if (rc == VM_FAULT_NOPAGE) {
+ unsigned long i;
+ pgoff_t pgoff;
+
+ /*
+ * In the device-dax case the only possibility for a
+ * VM_FAULT_NOPAGE result is when device-dax capacity is
+ * mapped. No need to consider the zero page, or racing
+ * conflicting mappings.
+ */
+ pgoff = linear_page_index(vmf->vma, vmf->address
+ & ~(fault_size - 1));
+ for (i = 0; i < fault_size / PAGE_SIZE; i++) {
+ struct page *page;
+
+ page = pfn_to_page(pfn_t_to_pfn(pfn) + i);
+ if (page->mapping)
+ continue;
+ page->mapping = filp->f_mapping;
+ page->index = pgoff + i;
+ }
+ }
+ dax_read_unlock(id);
+
+ return rc;
+}
+
+static vm_fault_t dev_dax_fault(struct vm_fault *vmf)
+{
+ return dev_dax_huge_fault(vmf, PE_SIZE_PTE);
+}
+
+static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr)
+{
+ struct file *filp = vma->vm_file;
+ struct dev_dax *dev_dax = filp->private_data;
+ struct dax_region *dax_region = dev_dax->region;
+
+ if (!IS_ALIGNED(addr, dax_region->align))
+ return -EINVAL;
+ return 0;
+}
+
+static unsigned long dev_dax_pagesize(struct vm_area_struct *vma)
+{
+ struct file *filp = vma->vm_file;
+ struct dev_dax *dev_dax = filp->private_data;
+ struct dax_region *dax_region = dev_dax->region;
+
+ return dax_region->align;
+}
+
+static const struct vm_operations_struct dax_vm_ops = {
+ .fault = dev_dax_fault,
+ .huge_fault = dev_dax_huge_fault,
+ .split = dev_dax_split,
+ .pagesize = dev_dax_pagesize,
+};
+
+static int dax_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct dev_dax *dev_dax = filp->private_data;
+ int rc, id;
+
+ dev_dbg(&dev_dax->dev, "trace\n");
+
+ /*
+ * We lock to check dax_dev liveness and will re-check at
+ * fault time.
+ */
+ id = dax_read_lock();
+ rc = check_vma(dev_dax, vma, __func__);
+ dax_read_unlock(id);
+ if (rc)
+ return rc;
+
+ vma->vm_ops = &dax_vm_ops;
+ vma->vm_flags |= VM_HUGEPAGE;
+ return 0;
+}
+
+/* return an unmapped area aligned to the dax region specified alignment */
+static unsigned long dax_get_unmapped_area(struct file *filp,
+ unsigned long addr, unsigned long len, unsigned long pgoff,
+ unsigned long flags)
+{
+ unsigned long off, off_end, off_align, len_align, addr_align, align;
+ struct dev_dax *dev_dax = filp ? filp->private_data : NULL;
+ struct dax_region *dax_region;
+
+ if (!dev_dax || addr)
+ goto out;
+
+ dax_region = dev_dax->region;
+ align = dax_region->align;
+ off = pgoff << PAGE_SHIFT;
+ off_end = off + len;
+ off_align = round_up(off, align);
+
+ if ((off_end <= off_align) || ((off_end - off_align) < align))
+ goto out;
+
+ len_align = len + align;
+ if ((off + len_align) < off)
+ goto out;
+
+ addr_align = current->mm->get_unmapped_area(filp, addr, len_align,
+ pgoff, flags);
+ if (!IS_ERR_VALUE(addr_align)) {
+ addr_align += (off - addr_align) & (align - 1);
+ return addr_align;
+ }
+ out:
+ return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
+}
+
+static const struct address_space_operations dev_dax_aops = {
+ .set_page_dirty = noop_set_page_dirty,
+ .invalidatepage = noop_invalidatepage,
+};
+
+static int dax_open(struct inode *inode, struct file *filp)
+{
+ struct dax_device *dax_dev = inode_dax(inode);
+ struct inode *__dax_inode = dax_inode(dax_dev);
+ struct dev_dax *dev_dax = dax_get_private(dax_dev);
+
+ dev_dbg(&dev_dax->dev, "trace\n");
+ inode->i_mapping = __dax_inode->i_mapping;
+ inode->i_mapping->host = __dax_inode;
+ inode->i_mapping->a_ops = &dev_dax_aops;
+ filp->f_mapping = inode->i_mapping;
+ filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
+ filp->f_sb_err = file_sample_sb_err(filp);
+ filp->private_data = dev_dax;
+ inode->i_flags = S_DAX;
+
+ return 0;
+}
+
+static int dax_release(struct inode *inode, struct file *filp)
+{
+ struct dev_dax *dev_dax = filp->private_data;
+
+ dev_dbg(&dev_dax->dev, "trace\n");
+ return 0;
+}
+
+static const struct file_operations dax_fops = {
+ .llseek = noop_llseek,
+ .owner = THIS_MODULE,
+ .open = dax_open,
+ .release = dax_release,
+ .get_unmapped_area = dax_get_unmapped_area,
+ .mmap = dax_mmap,
+ .mmap_supported_flags = MAP_SYNC,
+};
+
+static void dev_dax_cdev_del(void *cdev)
+{
+ cdev_del(cdev);
+}
+
+static void dev_dax_kill(void *dev_dax)
+{
+ kill_dev_dax(dev_dax);
+}
+
+int dev_dax_probe(struct device *dev)
+{
+ struct dev_dax *dev_dax = to_dev_dax(dev);
+ struct dax_device *dax_dev = dev_dax->dax_dev;
+ struct resource *res = &dev_dax->region->res;
+ struct inode *inode;
+ struct cdev *cdev;
+ void *addr;
+ int rc;
+
+ /* 1:1 map region resource range to device-dax instance range */
+ if (!devm_request_mem_region(dev, res->start, resource_size(res),
+ dev_name(dev))) {
+ dev_warn(dev, "could not reserve region %pR\n", res);
+ return -EBUSY;
+ }
+
+ dev_dax->pgmap.type = MEMORY_DEVICE_DEVDAX;
+ addr = devm_memremap_pages(dev, &dev_dax->pgmap);
+ if (IS_ERR(addr))
+ return PTR_ERR(addr);
+
+ inode = dax_inode(dax_dev);
+ cdev = inode->i_cdev;
+ cdev_init(cdev, &dax_fops);
+ if (dev->class) {
+ /* for the CONFIG_DEV_DAX_PMEM_COMPAT case */
+ cdev->owner = dev->parent->driver->owner;
+ } else
+ cdev->owner = dev->driver->owner;
+ cdev_set_parent(cdev, &dev->kobj);
+ rc = cdev_add(cdev, dev->devt, 1);
+ if (rc)
+ return rc;
+
+ rc = devm_add_action_or_reset(dev, dev_dax_cdev_del, cdev);
+ if (rc)
+ return rc;
+
+ run_dax(dax_dev);
+ return devm_add_action_or_reset(dev, dev_dax_kill, dev_dax);
+}
+EXPORT_SYMBOL_GPL(dev_dax_probe);
+
+static int dev_dax_remove(struct device *dev)
+{
+ /* all probe actions are unwound by devm */
+ return 0;
+}
+
+static struct dax_device_driver device_dax_driver = {
+ .drv = {
+ .probe = dev_dax_probe,
+ .remove = dev_dax_remove,
+ },
+ .match_always = 1,
+};
+
+static int __init dax_init(void)
+{
+ return dax_driver_register(&device_dax_driver);
+}
+
+static void __exit dax_exit(void)
+{
+ dax_driver_unregister(&device_dax_driver);
+}
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+module_init(dax_init);
+module_exit(dax_exit);
+MODULE_ALIAS_DAX_DEVICE(0);
diff --git a/marvell/linux/drivers/dax/kmem.c b/marvell/linux/drivers/dax/kmem.c
new file mode 100644
index 0000000..1e678bd
--- /dev/null
+++ b/marvell/linux/drivers/dax/kmem.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2016-2019 Intel Corporation. All rights reserved. */
+#include <linux/memremap.h>
+#include <linux/pagemap.h>
+#include <linux/memory.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/pfn_t.h>
+#include <linux/slab.h>
+#include <linux/dax.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include "dax-private.h"
+#include "bus.h"
+
+int dev_dax_kmem_probe(struct device *dev)
+{
+ struct dev_dax *dev_dax = to_dev_dax(dev);
+ struct resource *res = &dev_dax->region->res;
+ resource_size_t kmem_start;
+ resource_size_t kmem_size;
+ resource_size_t kmem_end;
+ struct resource *new_res;
+ const char *new_res_name;
+ int numa_node;
+ int rc;
+
+ /*
+ * Ensure good NUMA information for the persistent memory.
+ * Without this check, there is a risk that slow memory
+ * could be mixed in a node with faster memory, causing
+ * unavoidable performance issues.
+ */
+ numa_node = dev_dax->target_node;
+ if (numa_node < 0) {
+ dev_warn(dev, "rejecting DAX region %pR with invalid node: %d\n",
+ res, numa_node);
+ return -EINVAL;
+ }
+
+ /* Hotplug starting at the beginning of the next block: */
+ kmem_start = ALIGN(res->start, memory_block_size_bytes());
+
+ kmem_size = resource_size(res);
+ /* Adjust the size down to compensate for moving up kmem_start: */
+ kmem_size -= kmem_start - res->start;
+ /* Align the size down to cover only complete blocks: */
+ kmem_size &= ~(memory_block_size_bytes() - 1);
+ kmem_end = kmem_start + kmem_size;
+
+ new_res_name = kstrdup(dev_name(dev), GFP_KERNEL);
+ if (!new_res_name)
+ return -ENOMEM;
+
+ /* Region is permanently reserved if hotremove fails. */
+ new_res = request_mem_region(kmem_start, kmem_size, new_res_name);
+ if (!new_res) {
+ dev_warn(dev, "could not reserve region [%pa-%pa]\n",
+ &kmem_start, &kmem_end);
+ kfree(new_res_name);
+ return -EBUSY;
+ }
+
+ /*
+ * Set flags appropriate for System RAM. Leave ..._BUSY clear
+ * so that add_memory() can add a child resource. Do not
+ * inherit flags from the parent since it may set new flags
+ * unknown to us that will break add_memory() below.
+ */
+ new_res->flags = IORESOURCE_SYSTEM_RAM;
+
+ rc = add_memory(numa_node, new_res->start, resource_size(new_res));
+ if (rc) {
+ release_resource(new_res);
+ kfree(new_res);
+ kfree(new_res_name);
+ return rc;
+ }
+ dev_dax->dax_kmem_res = new_res;
+
+ return 0;
+}
+
+#ifdef CONFIG_MEMORY_HOTREMOVE
+static int dev_dax_kmem_remove(struct device *dev)
+{
+ struct dev_dax *dev_dax = to_dev_dax(dev);
+ struct resource *res = dev_dax->dax_kmem_res;
+ resource_size_t kmem_start = res->start;
+ resource_size_t kmem_size = resource_size(res);
+ const char *res_name = res->name;
+ int rc;
+
+ /*
+ * We have one shot for removing memory, if some memory blocks were not
+ * offline prior to calling this function remove_memory() will fail, and
+ * there is no way to hotremove this memory until reboot because device
+ * unbind will succeed even if we return failure.
+ */
+ rc = remove_memory(dev_dax->target_node, kmem_start, kmem_size);
+ if (rc) {
+ dev_err(dev,
+ "DAX region %pR cannot be hotremoved until the next reboot\n",
+ res);
+ return rc;
+ }
+
+ /* Release and free dax resources */
+ release_resource(res);
+ kfree(res);
+ kfree(res_name);
+ dev_dax->dax_kmem_res = NULL;
+
+ return 0;
+}
+#else
+static int dev_dax_kmem_remove(struct device *dev)
+{
+ /*
+ * Without hotremove purposely leak the request_mem_region() for the
+ * device-dax range and return '0' to ->remove() attempts. The removal
+ * of the device from the driver always succeeds, but the region is
+ * permanently pinned as reserved by the unreleased
+ * request_mem_region().
+ */
+ return 0;
+}
+#endif /* CONFIG_MEMORY_HOTREMOVE */
+
+static struct dax_device_driver device_dax_kmem_driver = {
+ .drv = {
+ .probe = dev_dax_kmem_probe,
+ .remove = dev_dax_kmem_remove,
+ },
+};
+
+static int __init dax_kmem_init(void)
+{
+ return dax_driver_register(&device_dax_kmem_driver);
+}
+
+static void __exit dax_kmem_exit(void)
+{
+ dax_driver_unregister(&device_dax_kmem_driver);
+}
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+module_init(dax_kmem_init);
+module_exit(dax_kmem_exit);
+MODULE_ALIAS_DAX_DEVICE(0);
diff --git a/marvell/linux/drivers/dax/pmem/Makefile b/marvell/linux/drivers/dax/pmem/Makefile
new file mode 100644
index 0000000..010269f
--- /dev/null
+++ b/marvell/linux/drivers/dax/pmem/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_DEV_DAX_PMEM) += dax_pmem.o
+obj-$(CONFIG_DEV_DAX_PMEM) += dax_pmem_core.o
+obj-$(CONFIG_DEV_DAX_PMEM_COMPAT) += dax_pmem_compat.o
+
+dax_pmem-y := pmem.o
+dax_pmem_core-y := core.o
+dax_pmem_compat-y := compat.o
diff --git a/marvell/linux/drivers/dax/pmem/compat.c b/marvell/linux/drivers/dax/pmem/compat.c
new file mode 100644
index 0000000..d7b15e6
--- /dev/null
+++ b/marvell/linux/drivers/dax/pmem/compat.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
+#include <linux/percpu-refcount.h>
+#include <linux/memremap.h>
+#include <linux/module.h>
+#include <linux/pfn_t.h>
+#include <linux/nd.h>
+#include "../bus.h"
+
+/* we need the private definitions to implement compat suport */
+#include "../dax-private.h"
+
+static int dax_pmem_compat_probe(struct device *dev)
+{
+ struct dev_dax *dev_dax = __dax_pmem_probe(dev, DEV_DAX_CLASS);
+ int rc;
+
+ if (IS_ERR(dev_dax))
+ return PTR_ERR(dev_dax);
+
+ if (!devres_open_group(&dev_dax->dev, dev_dax, GFP_KERNEL))
+ return -ENOMEM;
+
+ device_lock(&dev_dax->dev);
+ rc = dev_dax_probe(&dev_dax->dev);
+ device_unlock(&dev_dax->dev);
+
+ devres_close_group(&dev_dax->dev, dev_dax);
+ if (rc)
+ devres_release_group(&dev_dax->dev, dev_dax);
+
+ return rc;
+}
+
+static int dax_pmem_compat_release(struct device *dev, void *data)
+{
+ device_lock(dev);
+ devres_release_group(dev, to_dev_dax(dev));
+ device_unlock(dev);
+
+ return 0;
+}
+
+static int dax_pmem_compat_remove(struct device *dev)
+{
+ device_for_each_child(dev, NULL, dax_pmem_compat_release);
+ return 0;
+}
+
+static struct nd_device_driver dax_pmem_compat_driver = {
+ .probe = dax_pmem_compat_probe,
+ .remove = dax_pmem_compat_remove,
+ .drv = {
+ .name = "dax_pmem_compat",
+ },
+ .type = ND_DRIVER_DAX_PMEM,
+};
+
+static int __init dax_pmem_compat_init(void)
+{
+ return nd_driver_register(&dax_pmem_compat_driver);
+}
+module_init(dax_pmem_compat_init);
+
+static void __exit dax_pmem_compat_exit(void)
+{
+ driver_unregister(&dax_pmem_compat_driver.drv);
+}
+module_exit(dax_pmem_compat_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);
diff --git a/marvell/linux/drivers/dax/pmem/core.c b/marvell/linux/drivers/dax/pmem/core.c
new file mode 100644
index 0000000..6eb6dfd
--- /dev/null
+++ b/marvell/linux/drivers/dax/pmem/core.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
+#include <linux/memremap.h>
+#include <linux/module.h>
+#include <linux/pfn_t.h>
+#include "../../nvdimm/pfn.h"
+#include "../../nvdimm/nd.h"
+#include "../bus.h"
+
+struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys)
+{
+ struct resource res;
+ int rc, id, region_id;
+ resource_size_t offset;
+ struct nd_pfn_sb *pfn_sb;
+ struct dev_dax *dev_dax;
+ struct nd_namespace_io *nsio;
+ struct dax_region *dax_region;
+ struct dev_pagemap pgmap = { };
+ struct nd_namespace_common *ndns;
+ struct nd_dax *nd_dax = to_nd_dax(dev);
+ struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+
+ ndns = nvdimm_namespace_common_probe(dev);
+ if (IS_ERR(ndns))
+ return ERR_CAST(ndns);
+ nsio = to_nd_namespace_io(&ndns->dev);
+
+ /* parse the 'pfn' info block via ->rw_bytes */
+ rc = devm_nsio_enable(dev, nsio);
+ if (rc)
+ return ERR_PTR(rc);
+ rc = nvdimm_setup_pfn(nd_pfn, &pgmap);
+ if (rc)
+ return ERR_PTR(rc);
+ devm_nsio_disable(dev, nsio);
+
+ /* reserve the metadata area, device-dax will reserve the data */
+ pfn_sb = nd_pfn->pfn_sb;
+ offset = le64_to_cpu(pfn_sb->dataoff);
+ if (!devm_request_mem_region(dev, nsio->res.start, offset,
+ dev_name(&ndns->dev))) {
+ dev_warn(dev, "could not reserve metadata\n");
+ return ERR_PTR(-EBUSY);
+ }
+
+ rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", ®ion_id, &id);
+ if (rc != 2)
+ return ERR_PTR(-EINVAL);
+
+ /* adjust the dax_region resource to the start of data */
+ memcpy(&res, &pgmap.res, sizeof(res));
+ res.start += offset;
+ dax_region = alloc_dax_region(dev, region_id, &res,
+ nd_region->target_node, le32_to_cpu(pfn_sb->align),
+ PFN_DEV|PFN_MAP);
+ if (!dax_region)
+ return ERR_PTR(-ENOMEM);
+
+ dev_dax = __devm_create_dev_dax(dax_region, id, &pgmap, subsys);
+
+ /* child dev_dax instances now own the lifetime of the dax_region */
+ dax_region_put(dax_region);
+
+ return dev_dax;
+}
+EXPORT_SYMBOL_GPL(__dax_pmem_probe);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
diff --git a/marvell/linux/drivers/dax/pmem/pmem.c b/marvell/linux/drivers/dax/pmem/pmem.c
new file mode 100644
index 0000000..0ae4238
--- /dev/null
+++ b/marvell/linux/drivers/dax/pmem/pmem.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
+#include <linux/percpu-refcount.h>
+#include <linux/memremap.h>
+#include <linux/module.h>
+#include <linux/pfn_t.h>
+#include <linux/nd.h>
+#include "../bus.h"
+
+static int dax_pmem_probe(struct device *dev)
+{
+ return PTR_ERR_OR_ZERO(__dax_pmem_probe(dev, DEV_DAX_BUS));
+}
+
+static struct nd_device_driver dax_pmem_driver = {
+ .probe = dax_pmem_probe,
+ .drv = {
+ .name = "dax_pmem",
+ },
+ .type = ND_DRIVER_DAX_PMEM,
+};
+
+static int __init dax_pmem_init(void)
+{
+ return nd_driver_register(&dax_pmem_driver);
+}
+module_init(dax_pmem_init);
+
+static void __exit dax_pmem_exit(void)
+{
+ driver_unregister(&dax_pmem_driver.drv);
+}
+module_exit(dax_pmem_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
+#if !IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)
+/* For compat builds, don't load this module by default */
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);
+#endif
diff --git a/marvell/linux/drivers/dax/super.c b/marvell/linux/drivers/dax/super.c
new file mode 100644
index 0000000..5005b92
--- /dev/null
+++ b/marvell/linux/drivers/dax/super.c
@@ -0,0 +1,733 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright(c) 2017 Intel Corporation. All rights reserved.
+ */
+#include <linux/pagemap.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <linux/pseudo_fs.h>
+#include <linux/magic.h>
+#include <linux/genhd.h>
+#include <linux/pfn_t.h>
+#include <linux/cdev.h>
+#include <linux/hash.h>
+#include <linux/slab.h>
+#include <linux/uio.h>
+#include <linux/dax.h>
+#include <linux/fs.h>
+#include "dax-private.h"
+
+static dev_t dax_devt;
+DEFINE_STATIC_SRCU(dax_srcu);
+static struct vfsmount *dax_mnt;
+static DEFINE_IDA(dax_minor_ida);
+static struct kmem_cache *dax_cache __read_mostly;
+static struct super_block *dax_superblock __read_mostly;
+
+#define DAX_HASH_SIZE (PAGE_SIZE / sizeof(struct hlist_head))
+static struct hlist_head dax_host_list[DAX_HASH_SIZE];
+static DEFINE_SPINLOCK(dax_host_lock);
+
+int dax_read_lock(void)
+{
+ return srcu_read_lock(&dax_srcu);
+}
+EXPORT_SYMBOL_GPL(dax_read_lock);
+
+void dax_read_unlock(int id)
+{
+ srcu_read_unlock(&dax_srcu, id);
+}
+EXPORT_SYMBOL_GPL(dax_read_unlock);
+
+#ifdef CONFIG_BLOCK
+#include <linux/blkdev.h>
+
+int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
+ pgoff_t *pgoff)
+{
+ phys_addr_t phys_off = (get_start_sect(bdev) + sector) * 512;
+
+ if (pgoff)
+ *pgoff = PHYS_PFN(phys_off);
+ if (phys_off % PAGE_SIZE || size % PAGE_SIZE)
+ return -EINVAL;
+ return 0;
+}
+EXPORT_SYMBOL(bdev_dax_pgoff);
+
+#if IS_ENABLED(CONFIG_FS_DAX)
+struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
+{
+ if (!blk_queue_dax(bdev->bd_queue))
+ return NULL;
+ return fs_dax_get_by_host(bdev->bd_disk->disk_name);
+}
+EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
+#endif
+
+bool __generic_fsdax_supported(struct dax_device *dax_dev,
+ struct block_device *bdev, int blocksize, sector_t start,
+ sector_t sectors)
+{
+ bool dax_enabled = false;
+ pgoff_t pgoff, pgoff_end;
+ char buf[BDEVNAME_SIZE];
+ void *kaddr, *end_kaddr;
+ pfn_t pfn, end_pfn;
+ sector_t last_page;
+ long len, len2;
+ int err, id;
+
+ if (blocksize != PAGE_SIZE) {
+ pr_debug("%s: error: unsupported blocksize for dax\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ err = bdev_dax_pgoff(bdev, start, PAGE_SIZE, &pgoff);
+ if (err) {
+ pr_debug("%s: error: unaligned partition for dax\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ last_page = PFN_DOWN((start + sectors - 1) * 512) * PAGE_SIZE / 512;
+ err = bdev_dax_pgoff(bdev, last_page, PAGE_SIZE, &pgoff_end);
+ if (err) {
+ pr_debug("%s: error: unaligned partition for dax\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ id = dax_read_lock();
+ len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);
+ len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn);
+ dax_read_unlock(id);
+
+ if (len < 1 || len2 < 1) {
+ pr_debug("%s: error: dax access failed (%ld)\n",
+ bdevname(bdev, buf), len < 1 ? len : len2);
+ return false;
+ }
+
+ if (IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn)) {
+ /*
+ * An arch that has enabled the pmem api should also
+ * have its drivers support pfn_t_devmap()
+ *
+ * This is a developer warning and should not trigger in
+ * production. dax_flush() will crash since it depends
+ * on being able to do (page_address(pfn_to_page())).
+ */
+ WARN_ON(IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API));
+ dax_enabled = true;
+ } else if (pfn_t_devmap(pfn) && pfn_t_devmap(end_pfn)) {
+ struct dev_pagemap *pgmap, *end_pgmap;
+
+ pgmap = get_dev_pagemap(pfn_t_to_pfn(pfn), NULL);
+ end_pgmap = get_dev_pagemap(pfn_t_to_pfn(end_pfn), NULL);
+ if (pgmap && pgmap == end_pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX
+ && pfn_t_to_page(pfn)->pgmap == pgmap
+ && pfn_t_to_page(end_pfn)->pgmap == pgmap
+ && pfn_t_to_pfn(pfn) == PHYS_PFN(__pa(kaddr))
+ && pfn_t_to_pfn(end_pfn) == PHYS_PFN(__pa(end_kaddr)))
+ dax_enabled = true;
+ put_dev_pagemap(pgmap);
+ put_dev_pagemap(end_pgmap);
+
+ }
+
+ if (!dax_enabled) {
+ pr_debug("%s: error: dax support not enabled\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+ return true;
+}
+EXPORT_SYMBOL_GPL(__generic_fsdax_supported);
+
+/**
+ * __bdev_dax_supported() - Check if the device supports dax for filesystem
+ * @bdev: block device to check
+ * @blocksize: The block size of the device
+ *
+ * This is a library function for filesystems to check if the block device
+ * can be mounted with dax option.
+ *
+ * Return: true if supported, false if unsupported
+ */
+bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
+{
+ struct dax_device *dax_dev;
+ struct request_queue *q;
+ char buf[BDEVNAME_SIZE];
+ bool ret;
+ int id;
+
+ q = bdev_get_queue(bdev);
+ if (!q || !blk_queue_dax(q)) {
+ pr_debug("%s: error: request queue doesn't support dax\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
+ if (!dax_dev) {
+ pr_debug("%s: error: device does not support dax\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ id = dax_read_lock();
+ ret = dax_supported(dax_dev, bdev, blocksize, 0,
+ i_size_read(bdev->bd_inode) / 512);
+ dax_read_unlock(id);
+
+ put_dax(dax_dev);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__bdev_dax_supported);
+#endif
+
+enum dax_device_flags {
+ /* !alive + rcu grace period == no new operations / mappings */
+ DAXDEV_ALIVE,
+ /* gate whether dax_flush() calls the low level flush routine */
+ DAXDEV_WRITE_CACHE,
+ /* flag to check if device supports synchronous flush */
+ DAXDEV_SYNC,
+};
+
+/**
+ * struct dax_device - anchor object for dax services
+ * @inode: core vfs
+ * @cdev: optional character interface for "device dax"
+ * @host: optional name for lookups where the device path is not available
+ * @private: dax driver private data
+ * @flags: state and boolean properties
+ */
+struct dax_device {
+ struct hlist_node list;
+ struct inode inode;
+ struct cdev cdev;
+ const char *host;
+ void *private;
+ unsigned long flags;
+ const struct dax_operations *ops;
+};
+
+static ssize_t write_cache_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dax_device *dax_dev = dax_get_by_host(dev_name(dev));
+ ssize_t rc;
+
+ WARN_ON_ONCE(!dax_dev);
+ if (!dax_dev)
+ return -ENXIO;
+
+ rc = sprintf(buf, "%d\n", !!dax_write_cache_enabled(dax_dev));
+ put_dax(dax_dev);
+ return rc;
+}
+
+static ssize_t write_cache_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ bool write_cache;
+ int rc = strtobool(buf, &write_cache);
+ struct dax_device *dax_dev = dax_get_by_host(dev_name(dev));
+
+ WARN_ON_ONCE(!dax_dev);
+ if (!dax_dev)
+ return -ENXIO;
+
+ if (rc)
+ len = rc;
+ else
+ dax_write_cache(dax_dev, write_cache);
+
+ put_dax(dax_dev);
+ return len;
+}
+static DEVICE_ATTR_RW(write_cache);
+
+static umode_t dax_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, typeof(*dev), kobj);
+ struct dax_device *dax_dev = dax_get_by_host(dev_name(dev));
+
+ WARN_ON_ONCE(!dax_dev);
+ if (!dax_dev)
+ return 0;
+
+#ifndef CONFIG_ARCH_HAS_PMEM_API
+ if (a == &dev_attr_write_cache.attr)
+ return 0;
+#endif
+ return a->mode;
+}
+
+static struct attribute *dax_attributes[] = {
+ &dev_attr_write_cache.attr,
+ NULL,
+};
+
+struct attribute_group dax_attribute_group = {
+ .name = "dax",
+ .attrs = dax_attributes,
+ .is_visible = dax_visible,
+};
+EXPORT_SYMBOL_GPL(dax_attribute_group);
+
+/**
+ * dax_direct_access() - translate a device pgoff to an absolute pfn
+ * @dax_dev: a dax_device instance representing the logical memory range
+ * @pgoff: offset in pages from the start of the device to translate
+ * @nr_pages: number of consecutive pages caller can handle relative to @pfn
+ * @kaddr: output parameter that returns a virtual address mapping of pfn
+ * @pfn: output parameter that returns an absolute pfn translation of @pgoff
+ *
+ * Return: negative errno if an error occurs, otherwise the number of
+ * pages accessible at the device relative @pgoff.
+ */
+long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
+ void **kaddr, pfn_t *pfn)
+{
+ long avail;
+
+ if (!dax_dev)
+ return -EOPNOTSUPP;
+
+ if (!dax_alive(dax_dev))
+ return -ENXIO;
+
+ if (nr_pages < 0)
+ return nr_pages;
+
+ avail = dax_dev->ops->direct_access(dax_dev, pgoff, nr_pages,
+ kaddr, pfn);
+ if (!avail)
+ return -ERANGE;
+ return min(avail, nr_pages);
+}
+EXPORT_SYMBOL_GPL(dax_direct_access);
+
+bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
+ int blocksize, sector_t start, sector_t len)
+{
+ if (!dax_dev)
+ return false;
+
+ if (!dax_alive(dax_dev))
+ return false;
+
+ return dax_dev->ops->dax_supported(dax_dev, bdev, blocksize, start, len);
+}
+EXPORT_SYMBOL_GPL(dax_supported);
+
+size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
+ size_t bytes, struct iov_iter *i)
+{
+ if (!dax_alive(dax_dev))
+ return 0;
+
+ return dax_dev->ops->copy_from_iter(dax_dev, pgoff, addr, bytes, i);
+}
+EXPORT_SYMBOL_GPL(dax_copy_from_iter);
+
+size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
+ size_t bytes, struct iov_iter *i)
+{
+ if (!dax_alive(dax_dev))
+ return 0;
+
+ return dax_dev->ops->copy_to_iter(dax_dev, pgoff, addr, bytes, i);
+}
+EXPORT_SYMBOL_GPL(dax_copy_to_iter);
+
+#ifdef CONFIG_ARCH_HAS_PMEM_API
+void arch_wb_cache_pmem(void *addr, size_t size);
+void dax_flush(struct dax_device *dax_dev, void *addr, size_t size)
+{
+ if (unlikely(!dax_write_cache_enabled(dax_dev)))
+ return;
+
+ arch_wb_cache_pmem(addr, size);
+}
+#else
+void dax_flush(struct dax_device *dax_dev, void *addr, size_t size)
+{
+}
+#endif
+EXPORT_SYMBOL_GPL(dax_flush);
+
+void dax_write_cache(struct dax_device *dax_dev, bool wc)
+{
+ if (wc)
+ set_bit(DAXDEV_WRITE_CACHE, &dax_dev->flags);
+ else
+ clear_bit(DAXDEV_WRITE_CACHE, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(dax_write_cache);
+
+bool dax_write_cache_enabled(struct dax_device *dax_dev)
+{
+ return test_bit(DAXDEV_WRITE_CACHE, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(dax_write_cache_enabled);
+
+bool __dax_synchronous(struct dax_device *dax_dev)
+{
+ return test_bit(DAXDEV_SYNC, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(__dax_synchronous);
+
+void __set_dax_synchronous(struct dax_device *dax_dev)
+{
+ set_bit(DAXDEV_SYNC, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(__set_dax_synchronous);
+
+bool dax_alive(struct dax_device *dax_dev)
+{
+ lockdep_assert_held(&dax_srcu);
+ return test_bit(DAXDEV_ALIVE, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(dax_alive);
+
+static int dax_host_hash(const char *host)
+{
+ return hashlen_hash(hashlen_string("DAX", host)) % DAX_HASH_SIZE;
+}
+
+/*
+ * Note, rcu is not protecting the liveness of dax_dev, rcu is ensuring
+ * that any fault handlers or operations that might have seen
+ * dax_alive(), have completed. Any operations that start after
+ * synchronize_srcu() has run will abort upon seeing !dax_alive().
+ */
+void kill_dax(struct dax_device *dax_dev)
+{
+ if (!dax_dev)
+ return;
+
+ clear_bit(DAXDEV_ALIVE, &dax_dev->flags);
+
+ synchronize_srcu(&dax_srcu);
+
+ spin_lock(&dax_host_lock);
+ hlist_del_init(&dax_dev->list);
+ spin_unlock(&dax_host_lock);
+}
+EXPORT_SYMBOL_GPL(kill_dax);
+
+void run_dax(struct dax_device *dax_dev)
+{
+ set_bit(DAXDEV_ALIVE, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(run_dax);
+
+static struct inode *dax_alloc_inode(struct super_block *sb)
+{
+ struct dax_device *dax_dev;
+ struct inode *inode;
+
+ dax_dev = kmem_cache_alloc(dax_cache, GFP_KERNEL);
+ if (!dax_dev)
+ return NULL;
+
+ inode = &dax_dev->inode;
+ inode->i_rdev = 0;
+ return inode;
+}
+
+static struct dax_device *to_dax_dev(struct inode *inode)
+{
+ return container_of(inode, struct dax_device, inode);
+}
+
+static void dax_free_inode(struct inode *inode)
+{
+ struct dax_device *dax_dev = to_dax_dev(inode);
+ kfree(dax_dev->host);
+ dax_dev->host = NULL;
+ if (inode->i_rdev)
+ ida_simple_remove(&dax_minor_ida, MINOR(inode->i_rdev));
+ kmem_cache_free(dax_cache, dax_dev);
+}
+
+static void dax_destroy_inode(struct inode *inode)
+{
+ struct dax_device *dax_dev = to_dax_dev(inode);
+ WARN_ONCE(test_bit(DAXDEV_ALIVE, &dax_dev->flags),
+ "kill_dax() must be called before final iput()\n");
+}
+
+static const struct super_operations dax_sops = {
+ .statfs = simple_statfs,
+ .alloc_inode = dax_alloc_inode,
+ .destroy_inode = dax_destroy_inode,
+ .free_inode = dax_free_inode,
+ .drop_inode = generic_delete_inode,
+};
+
+static int dax_init_fs_context(struct fs_context *fc)
+{
+ struct pseudo_fs_context *ctx = init_pseudo(fc, DAXFS_MAGIC);
+ if (!ctx)
+ return -ENOMEM;
+ ctx->ops = &dax_sops;
+ return 0;
+}
+
+static struct file_system_type dax_fs_type = {
+ .name = "dax",
+ .init_fs_context = dax_init_fs_context,
+ .kill_sb = kill_anon_super,
+};
+
+static int dax_test(struct inode *inode, void *data)
+{
+ dev_t devt = *(dev_t *) data;
+
+ return inode->i_rdev == devt;
+}
+
+static int dax_set(struct inode *inode, void *data)
+{
+ dev_t devt = *(dev_t *) data;
+
+ inode->i_rdev = devt;
+ return 0;
+}
+
+static struct dax_device *dax_dev_get(dev_t devt)
+{
+ struct dax_device *dax_dev;
+ struct inode *inode;
+
+ inode = iget5_locked(dax_superblock, hash_32(devt + DAXFS_MAGIC, 31),
+ dax_test, dax_set, &devt);
+
+ if (!inode)
+ return NULL;
+
+ dax_dev = to_dax_dev(inode);
+ if (inode->i_state & I_NEW) {
+ set_bit(DAXDEV_ALIVE, &dax_dev->flags);
+ inode->i_cdev = &dax_dev->cdev;
+ inode->i_mode = S_IFCHR;
+ inode->i_flags = S_DAX;
+ mapping_set_gfp_mask(&inode->i_data, GFP_USER);
+ unlock_new_inode(inode);
+ }
+
+ return dax_dev;
+}
+
+static void dax_add_host(struct dax_device *dax_dev, const char *host)
+{
+ int hash;
+
+ /*
+ * Unconditionally init dax_dev since it's coming from a
+ * non-zeroed slab cache
+ */
+ INIT_HLIST_NODE(&dax_dev->list);
+ dax_dev->host = host;
+ if (!host)
+ return;
+
+ hash = dax_host_hash(host);
+ spin_lock(&dax_host_lock);
+ hlist_add_head(&dax_dev->list, &dax_host_list[hash]);
+ spin_unlock(&dax_host_lock);
+}
+
+struct dax_device *alloc_dax(void *private, const char *__host,
+ const struct dax_operations *ops, unsigned long flags)
+{
+ struct dax_device *dax_dev;
+ const char *host;
+ dev_t devt;
+ int minor;
+
+ host = kstrdup(__host, GFP_KERNEL);
+ if (__host && !host)
+ return NULL;
+
+ minor = ida_simple_get(&dax_minor_ida, 0, MINORMASK+1, GFP_KERNEL);
+ if (minor < 0)
+ goto err_minor;
+
+ devt = MKDEV(MAJOR(dax_devt), minor);
+ dax_dev = dax_dev_get(devt);
+ if (!dax_dev)
+ goto err_dev;
+
+ dax_add_host(dax_dev, host);
+ dax_dev->ops = ops;
+ dax_dev->private = private;
+ if (flags & DAXDEV_F_SYNC)
+ set_dax_synchronous(dax_dev);
+
+ return dax_dev;
+
+ err_dev:
+ ida_simple_remove(&dax_minor_ida, minor);
+ err_minor:
+ kfree(host);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(alloc_dax);
+
+void put_dax(struct dax_device *dax_dev)
+{
+ if (!dax_dev)
+ return;
+ iput(&dax_dev->inode);
+}
+EXPORT_SYMBOL_GPL(put_dax);
+
+/**
+ * dax_get_by_host() - temporary lookup mechanism for filesystem-dax
+ * @host: alternate name for the device registered by a dax driver
+ */
+struct dax_device *dax_get_by_host(const char *host)
+{
+ struct dax_device *dax_dev, *found = NULL;
+ int hash, id;
+
+ if (!host)
+ return NULL;
+
+ hash = dax_host_hash(host);
+
+ id = dax_read_lock();
+ spin_lock(&dax_host_lock);
+ hlist_for_each_entry(dax_dev, &dax_host_list[hash], list) {
+ if (!dax_alive(dax_dev)
+ || strcmp(host, dax_dev->host) != 0)
+ continue;
+
+ if (igrab(&dax_dev->inode))
+ found = dax_dev;
+ break;
+ }
+ spin_unlock(&dax_host_lock);
+ dax_read_unlock(id);
+
+ return found;
+}
+EXPORT_SYMBOL_GPL(dax_get_by_host);
+
+/**
+ * inode_dax: convert a public inode into its dax_dev
+ * @inode: An inode with i_cdev pointing to a dax_dev
+ *
+ * Note this is not equivalent to to_dax_dev() which is for private
+ * internal use where we know the inode filesystem type == dax_fs_type.
+ */
+struct dax_device *inode_dax(struct inode *inode)
+{
+ struct cdev *cdev = inode->i_cdev;
+
+ return container_of(cdev, struct dax_device, cdev);
+}
+EXPORT_SYMBOL_GPL(inode_dax);
+
+struct inode *dax_inode(struct dax_device *dax_dev)
+{
+ return &dax_dev->inode;
+}
+EXPORT_SYMBOL_GPL(dax_inode);
+
+void *dax_get_private(struct dax_device *dax_dev)
+{
+ if (!test_bit(DAXDEV_ALIVE, &dax_dev->flags))
+ return NULL;
+ return dax_dev->private;
+}
+EXPORT_SYMBOL_GPL(dax_get_private);
+
+static void init_once(void *_dax_dev)
+{
+ struct dax_device *dax_dev = _dax_dev;
+ struct inode *inode = &dax_dev->inode;
+
+ memset(dax_dev, 0, sizeof(*dax_dev));
+ inode_init_once(inode);
+}
+
+static int dax_fs_init(void)
+{
+ int rc;
+
+ dax_cache = kmem_cache_create("dax_cache", sizeof(struct dax_device), 0,
+ (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ init_once);
+ if (!dax_cache)
+ return -ENOMEM;
+
+ dax_mnt = kern_mount(&dax_fs_type);
+ if (IS_ERR(dax_mnt)) {
+ rc = PTR_ERR(dax_mnt);
+ goto err_mount;
+ }
+ dax_superblock = dax_mnt->mnt_sb;
+
+ return 0;
+
+ err_mount:
+ kmem_cache_destroy(dax_cache);
+
+ return rc;
+}
+
+static void dax_fs_exit(void)
+{
+ kern_unmount(dax_mnt);
+ rcu_barrier();
+ kmem_cache_destroy(dax_cache);
+}
+
+static int __init dax_core_init(void)
+{
+ int rc;
+
+ rc = dax_fs_init();
+ if (rc)
+ return rc;
+
+ rc = alloc_chrdev_region(&dax_devt, 0, MINORMASK+1, "dax");
+ if (rc)
+ goto err_chrdev;
+
+ rc = dax_bus_init();
+ if (rc)
+ goto err_bus;
+ return 0;
+
+err_bus:
+ unregister_chrdev_region(dax_devt, MINORMASK+1);
+err_chrdev:
+ dax_fs_exit();
+ return 0;
+}
+
+static void __exit dax_core_exit(void)
+{
+ dax_bus_exit();
+ unregister_chrdev_region(dax_devt, MINORMASK+1);
+ ida_destroy(&dax_minor_ida);
+ dax_fs_exit();
+}
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+subsys_initcall(dax_core_init);
+module_exit(dax_core_exit);