Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 874 insertions, 0 deletions

diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
new file mode 100644
index 000000000..1634e3c34
--- /dev/null
+++ b/drivers/nvdimm/dimm_devs.c
@@ -0,0 +1,874 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/moduleparam.h>
+#include <linux/vmalloc.h>
+#include <linux/device.h>
+#include <linux/ndctl.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include "nd-core.h"
+#include "label.h"
+#include "pmem.h"
+#include "nd.h"
+
+static DEFINE_IDA(dimm_ida);
+
+/*
+ * Retrieve bus and dimm handle and return if this bus supports
+ * get_config_data commands
+ */
+int nvdimm_check_config_data(struct device *dev)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	if (!nvdimm->cmd_mask ||
+	    !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
+		if (test_bit(NDD_LABELING, &nvdimm->flags))
+			return -ENXIO;
+		else
+			return -ENOTTY;
+	}
+
+	return 0;
+}
+
+static int validate_dimm(struct nvdimm_drvdata *ndd)
+{
+	int rc;
+
+	if (!ndd)
+		return -EINVAL;
+
+	rc = nvdimm_check_config_data(ndd->dev);
+	if (rc)
+		dev_dbg(ndd->dev, "%ps: %s error: %d\n",
+				__builtin_return_address(0), __func__, rc);
+	return rc;
+}
+
+/**
+ * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
+ * @nvdimm: dimm to initialize
+ */
+int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
+{
+	struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
+	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+	struct nvdimm_bus_descriptor *nd_desc;
+	int rc = validate_dimm(ndd);
+	int cmd_rc = 0;
+
+	if (rc)
+		return rc;
+
+	if (cmd->config_size)
+		return 0; /* already valid */
+
+	memset(cmd, 0, sizeof(*cmd));
+	nd_desc = nvdimm_bus->nd_desc;
+	rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
+			ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc);
+	if (rc < 0)
+		return rc;
+	return cmd_rc;
+}
+
+int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
+			   size_t offset, size_t len)
+{
+	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
+	int rc = validate_dimm(ndd), cmd_rc = 0;
+	struct nd_cmd_get_config_data_hdr *cmd;
+	size_t max_cmd_size, buf_offset;
+
+	if (rc)
+		return rc;
+
+	if (offset + len > ndd->nsarea.config_size)
+		return -ENXIO;
+
+	max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
+	cmd = kvzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+
+	for (buf_offset = 0; len;
+	     len -= cmd->in_length, buf_offset += cmd->in_length) {
+		size_t cmd_size;
+
+		cmd->in_offset = offset + buf_offset;
+		cmd->in_length = min(max_cmd_size, len);
+
+		cmd_size = sizeof(*cmd) + cmd->in_length;
+
+		rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
+				ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
+		if (rc < 0)
+			break;
+		if (cmd_rc < 0) {
+			rc = cmd_rc;
+			break;
+		}
+
+		/* out_buf should be valid, copy it into our output buffer */
+		memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length);
+	}
+	kvfree(cmd);
+
+	return rc;
+}
+
+int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
+		void *buf, size_t len)
+{
+	size_t max_cmd_size, buf_offset;
+	struct nd_cmd_set_config_hdr *cmd;
+	int rc = validate_dimm(ndd), cmd_rc = 0;
+	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
+
+	if (rc)
+		return rc;
+
+	if (offset + len > ndd->nsarea.config_size)
+		return -ENXIO;
+
+	max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
+	cmd = kvzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+
+	for (buf_offset = 0; len; len -= cmd->in_length,
+			buf_offset += cmd->in_length) {
+		size_t cmd_size;
+
+		cmd->in_offset = offset + buf_offset;
+		cmd->in_length = min(max_cmd_size, len);
+		memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
+
+		/* status is output in the last 4-bytes of the command buffer */
+		cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
+
+		rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
+				ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
+		if (rc < 0)
+			break;
+		if (cmd_rc < 0) {
+			rc = cmd_rc;
+			break;
+		}
+	}
+	kvfree(cmd);
+
+	return rc;
+}
+
+void nvdimm_set_labeling(struct device *dev)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	set_bit(NDD_LABELING, &nvdimm->flags);
+}
+
+void nvdimm_set_locked(struct device *dev)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	set_bit(NDD_LOCKED, &nvdimm->flags);
+}
+
+void nvdimm_clear_locked(struct device *dev)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	clear_bit(NDD_LOCKED, &nvdimm->flags);
+}
+
+static void nvdimm_release(struct device *dev)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	ida_simple_remove(&dimm_ida, nvdimm->id);
+	kfree(nvdimm);
+}
+
+struct nvdimm *to_nvdimm(struct device *dev)
+{
+	struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
+
+	WARN_ON(!is_nvdimm(dev));
+	return nvdimm;
+}
+EXPORT_SYMBOL_GPL(to_nvdimm);
+
+struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
+{
+	struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+	WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
+
+	return dev_get_drvdata(&nvdimm->dev);
+}
+EXPORT_SYMBOL(to_ndd);
+
+void nvdimm_drvdata_release(struct kref *kref)
+{
+	struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref);
+	struct device *dev = ndd->dev;
+	struct resource *res, *_r;
+
+	dev_dbg(dev, "trace\n");
+	nvdimm_bus_lock(dev);
+	for_each_dpa_resource_safe(ndd, res, _r)
+		nvdimm_free_dpa(ndd, res);
+	nvdimm_bus_unlock(dev);
+
+	kvfree(ndd->data);
+	kfree(ndd);
+	put_device(dev);
+}
+
+void get_ndd(struct nvdimm_drvdata *ndd)
+{
+	kref_get(&ndd->kref);
+}
+
+void put_ndd(struct nvdimm_drvdata *ndd)
+{
+	if (ndd)
+		kref_put(&ndd->kref, nvdimm_drvdata_release);
+}
+
+const char *nvdimm_name(struct nvdimm *nvdimm)
+{
+	return dev_name(&nvdimm->dev);
+}
+EXPORT_SYMBOL_GPL(nvdimm_name);
+
+struct kobject *nvdimm_kobj(struct nvdimm *nvdimm)
+{
+	return &nvdimm->dev.kobj;
+}
+EXPORT_SYMBOL_GPL(nvdimm_kobj);
+
+unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm)
+{
+	return nvdimm->cmd_mask;
+}
+EXPORT_SYMBOL_GPL(nvdimm_cmd_mask);
+
+void *nvdimm_provider_data(struct nvdimm *nvdimm)
+{
+	if (nvdimm)
+		return nvdimm->provider_data;
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(nvdimm_provider_data);
+
+static ssize_t commands_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+	int cmd, len = 0;
+
+	if (!nvdimm->cmd_mask)
+		return sprintf(buf, "\n");
+
+	for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG)
+		len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
+	len += sprintf(buf + len, "\n");
+	return len;
+}
+static DEVICE_ATTR_RO(commands);
+
+static ssize_t flags_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	return sprintf(buf, "%s%s\n",
+			test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "",
+			test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : "");
+}
+static DEVICE_ATTR_RO(flags);
+
+static ssize_t state_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	/*
+	 * The state may be in the process of changing, userspace should
+	 * quiesce probing if it wants a static answer
+	 */
+	nvdimm_bus_lock(dev);
+	nvdimm_bus_unlock(dev);
+	return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
+			? "active" : "idle");
+}
+static DEVICE_ATTR_RO(state);
+
+static ssize_t __available_slots_show(struct nvdimm_drvdata *ndd, char *buf)
+{
+	struct device *dev;
+	ssize_t rc;
+	u32 nfree;
+
+	if (!ndd)
+		return -ENXIO;
+
+	dev = ndd->dev;
+	nvdimm_bus_lock(dev);
+	nfree = nd_label_nfree(ndd);
+	if (nfree - 1 > nfree) {
+		dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
+		nfree = 0;
+	} else
+		nfree--;
+	rc = sprintf(buf, "%d\n", nfree);
+	nvdimm_bus_unlock(dev);
+	return rc;
+}
+
+static ssize_t available_slots_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	ssize_t rc;
+
+	device_lock(dev);
+	rc = __available_slots_show(dev_get_drvdata(dev), buf);
+	device_unlock(dev);
+
+	return rc;
+}
+static DEVICE_ATTR_RO(available_slots);
+
+__weak ssize_t security_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags))
+		return sprintf(buf, "overwrite\n");
+	if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags))
+		return sprintf(buf, "disabled\n");
+	if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags))
+		return sprintf(buf, "unlocked\n");
+	if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags))
+		return sprintf(buf, "locked\n");
+	return -ENOTTY;
+}
+
+static ssize_t frozen_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	return sprintf(buf, "%d\n", test_bit(NVDIMM_SECURITY_FROZEN,
+				&nvdimm->sec.flags));
+}
+static DEVICE_ATTR_RO(frozen);
+
+static ssize_t security_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t len)
+
+{
+	ssize_t rc;
+
+	/*
+	 * Require all userspace triggered security management to be
+	 * done while probing is idle and the DIMM is not in active use
+	 * in any region.
+	 */
+	device_lock(dev);
+	nvdimm_bus_lock(dev);
+	wait_nvdimm_bus_probe_idle(dev);
+	rc = nvdimm_security_store(dev, buf, len);
+	nvdimm_bus_unlock(dev);
+	device_unlock(dev);
+
+	return rc;
+}
+static DEVICE_ATTR_RW(security);
+
+static struct attribute *nvdimm_attributes[] = {
+	&dev_attr_state.attr,
+	&dev_attr_flags.attr,
+	&dev_attr_commands.attr,
+	&dev_attr_available_slots.attr,
+	&dev_attr_security.attr,
+	&dev_attr_frozen.attr,
+	NULL,
+};
+
+static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+	struct device *dev = container_of(kobj, typeof(*dev), kobj);
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	if (a != &dev_attr_security.attr && a != &dev_attr_frozen.attr)
+		return a->mode;
+	if (!nvdimm->sec.flags)
+		return 0;
+
+	if (a == &dev_attr_security.attr) {
+		/* Are there any state mutation ops (make writable)? */
+		if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
+				|| nvdimm->sec.ops->change_key
+				|| nvdimm->sec.ops->erase
+				|| nvdimm->sec.ops->overwrite)
+			return a->mode;
+		return 0444;
+	}
+
+	if (nvdimm->sec.ops->freeze)
+		return a->mode;
+	return 0;
+}
+
+static const struct attribute_group nvdimm_attribute_group = {
+	.attrs = nvdimm_attributes,
+	.is_visible = nvdimm_visible,
+};
+
+static ssize_t result_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+	enum nvdimm_fwa_result result;
+
+	if (!nvdimm->fw_ops)
+		return -EOPNOTSUPP;
+
+	nvdimm_bus_lock(dev);
+	result = nvdimm->fw_ops->activate_result(nvdimm);
+	nvdimm_bus_unlock(dev);
+
+	switch (result) {
+	case NVDIMM_FWA_RESULT_NONE:
+		return sprintf(buf, "none\n");
+	case NVDIMM_FWA_RESULT_SUCCESS:
+		return sprintf(buf, "success\n");
+	case NVDIMM_FWA_RESULT_FAIL:
+		return sprintf(buf, "fail\n");
+	case NVDIMM_FWA_RESULT_NOTSTAGED:
+		return sprintf(buf, "not_staged\n");
+	case NVDIMM_FWA_RESULT_NEEDRESET:
+		return sprintf(buf, "need_reset\n");
+	default:
+		return -ENXIO;
+	}
+}
+static DEVICE_ATTR_ADMIN_RO(result);
+
+static ssize_t activate_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+	enum nvdimm_fwa_state state;
+
+	if (!nvdimm->fw_ops)
+		return -EOPNOTSUPP;
+
+	nvdimm_bus_lock(dev);
+	state = nvdimm->fw_ops->activate_state(nvdimm);
+	nvdimm_bus_unlock(dev);
+
+	switch (state) {
+	case NVDIMM_FWA_IDLE:
+		return sprintf(buf, "idle\n");
+	case NVDIMM_FWA_BUSY:
+		return sprintf(buf, "busy\n");
+	case NVDIMM_FWA_ARMED:
+		return sprintf(buf, "armed\n");
+	default:
+		return -ENXIO;
+	}
+}
+
+static ssize_t activate_store(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t len)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+	enum nvdimm_fwa_trigger arg;
+	int rc;
+
+	if (!nvdimm->fw_ops)
+		return -EOPNOTSUPP;
+
+	if (sysfs_streq(buf, "arm"))
+		arg = NVDIMM_FWA_ARM;
+	else if (sysfs_streq(buf, "disarm"))
+		arg = NVDIMM_FWA_DISARM;
+	else
+		return -EINVAL;
+
+	nvdimm_bus_lock(dev);
+	rc = nvdimm->fw_ops->arm(nvdimm, arg);
+	nvdimm_bus_unlock(dev);
+
+	if (rc < 0)
+		return rc;
+	return len;
+}
+static DEVICE_ATTR_ADMIN_RW(activate);
+
+static struct attribute *nvdimm_firmware_attributes[] = {
+	&dev_attr_activate.attr,
+	&dev_attr_result.attr,
+	NULL,
+};
+
+static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+	struct device *dev = container_of(kobj, typeof(*dev), kobj);
+	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+	enum nvdimm_fwa_capability cap;
+
+	if (!nd_desc->fw_ops)
+		return 0;
+	if (!nvdimm->fw_ops)
+		return 0;
+
+	nvdimm_bus_lock(dev);
+	cap = nd_desc->fw_ops->capability(nd_desc);
+	nvdimm_bus_unlock(dev);
+
+	if (cap < NVDIMM_FWA_CAP_QUIESCE)
+		return 0;
+
+	return a->mode;
+}
+
+static const struct attribute_group nvdimm_firmware_attribute_group = {
+	.name = "firmware",
+	.attrs = nvdimm_firmware_attributes,
+	.is_visible = nvdimm_firmware_visible,
+};
+
+static const struct attribute_group *nvdimm_attribute_groups[] = {
+	&nd_device_attribute_group,
+	&nvdimm_attribute_group,
+	&nvdimm_firmware_attribute_group,
+	NULL,
+};
+
+static const struct device_type nvdimm_device_type = {
+	.name = "nvdimm",
+	.release = nvdimm_release,
+	.groups = nvdimm_attribute_groups,
+};
+
+bool is_nvdimm(struct device *dev)
+{
+	return dev->type == &nvdimm_device_type;
+}
+
+static struct lock_class_key nvdimm_key;
+
+struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
+		void *provider_data, const struct attribute_group **groups,
+		unsigned long flags, unsigned long cmd_mask, int num_flush,
+		struct resource *flush_wpq, const char *dimm_id,
+		const struct nvdimm_security_ops *sec_ops,
+		const struct nvdimm_fw_ops *fw_ops)
+{
+	struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
+	struct device *dev;
+
+	if (!nvdimm)
+		return NULL;
+
+	nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
+	if (nvdimm->id < 0) {
+		kfree(nvdimm);
+		return NULL;
+	}
+
+	nvdimm->dimm_id = dimm_id;
+	nvdimm->provider_data = provider_data;
+	nvdimm->flags = flags;
+	nvdimm->cmd_mask = cmd_mask;
+	nvdimm->num_flush = num_flush;
+	nvdimm->flush_wpq = flush_wpq;
+	atomic_set(&nvdimm->busy, 0);
+	dev = &nvdimm->dev;
+	dev_set_name(dev, "nmem%d", nvdimm->id);
+	dev->parent = &nvdimm_bus->dev;
+	dev->type = &nvdimm_device_type;
+	dev->devt = MKDEV(nvdimm_major, nvdimm->id);
+	dev->groups = groups;
+	nvdimm->sec.ops = sec_ops;
+	nvdimm->fw_ops = fw_ops;
+	nvdimm->sec.overwrite_tmo = 0;
+	INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query);
+	/*
+	 * Security state must be initialized before device_add() for
+	 * attribute visibility.
+	 */
+	/* get security state and extended (master) state */
+	nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
+	nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
+	device_initialize(dev);
+	lockdep_set_class(&dev->mutex, &nvdimm_key);
+	if (test_bit(NDD_REGISTER_SYNC, &flags))
+		nd_device_register_sync(dev);
+	else
+		nd_device_register(dev);
+
+	return nvdimm;
+}
+EXPORT_SYMBOL_GPL(__nvdimm_create);
+
+void nvdimm_delete(struct nvdimm *nvdimm)
+{
+	struct device *dev = &nvdimm->dev;
+	bool dev_put = false;
+
+	/* We are shutting down. Make state frozen artificially. */
+	nvdimm_bus_lock(dev);
+	set_bit(NVDIMM_SECURITY_FROZEN, &nvdimm->sec.flags);
+	if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags))
+		dev_put = true;
+	nvdimm_bus_unlock(dev);
+	cancel_delayed_work_sync(&nvdimm->dwork);
+	if (dev_put)
+		put_device(dev);
+	nd_device_unregister(dev, ND_SYNC);
+}
+EXPORT_SYMBOL_GPL(nvdimm_delete);
+
+static void shutdown_security_notify(void *data)
+{
+	struct nvdimm *nvdimm = data;
+
+	sysfs_put(nvdimm->sec.overwrite_state);
+}
+
+int nvdimm_security_setup_events(struct device *dev)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+
+	if (!nvdimm->sec.flags || !nvdimm->sec.ops
+			|| !nvdimm->sec.ops->overwrite)
+		return 0;
+	nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security");
+	if (!nvdimm->sec.overwrite_state)
+		return -ENOMEM;
+
+	return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm);
+}
+EXPORT_SYMBOL_GPL(nvdimm_security_setup_events);
+
+int nvdimm_in_overwrite(struct nvdimm *nvdimm)
+{
+	return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
+}
+EXPORT_SYMBOL_GPL(nvdimm_in_overwrite);
+
+int nvdimm_security_freeze(struct nvdimm *nvdimm)
+{
+	int rc;
+
+	WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
+
+	if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze)
+		return -EOPNOTSUPP;
+
+	if (!nvdimm->sec.flags)
+		return -EIO;
+
+	if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
+		dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n");
+		return -EBUSY;
+	}
+
+	rc = nvdimm->sec.ops->freeze(nvdimm);
+	nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
+
+	return rc;
+}
+
+static unsigned long dpa_align(struct nd_region *nd_region)
+{
+	struct device *dev = &nd_region->dev;
+
+	if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev),
+				"bus lock required for capacity provision\n"))
+		return 0;
+	if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align
+				% nd_region->ndr_mappings,
+				"invalid region align %#lx mappings: %d\n",
+				nd_region->align, nd_region->ndr_mappings))
+		return 0;
+	return nd_region->align / nd_region->ndr_mappings;
+}
+
+/**
+ * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
+ *			   contiguous unallocated dpa range.
+ * @nd_region: constrain available space check to this reference region
+ * @nd_mapping: container of dpa-resource-root + labels
+ */
+resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
+					   struct nd_mapping *nd_mapping)
+{
+	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+	struct nvdimm_bus *nvdimm_bus;
+	resource_size_t max = 0;
+	struct resource *res;
+	unsigned long align;
+
+	/* if a dimm is disabled the available capacity is zero */
+	if (!ndd)
+		return 0;
+
+	align = dpa_align(nd_region);
+	if (!align)
+		return 0;
+
+	nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+	if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
+		return 0;
+	for_each_dpa_resource(ndd, res) {
+		resource_size_t start, end;
+
+		if (strcmp(res->name, "pmem-reserve") != 0)
+			continue;
+		/* trim free space relative to current alignment setting */
+		start = ALIGN(res->start, align);
+		end = ALIGN_DOWN(res->end + 1, align) - 1;
+		if (end < start)
+			continue;
+		if (end - start + 1 > max)
+			max = end - start + 1;
+	}
+	release_free_pmem(nvdimm_bus, nd_mapping);
+	return max;
+}
+
+/**
+ * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
+ * @nd_mapping: container of dpa-resource-root + labels
+ * @nd_region: constrain available space check to this reference region
+ *
+ * Validate that a PMEM label, if present, aligns with the start of an
+ * interleave set.
+ */
+resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
+				      struct nd_mapping *nd_mapping)
+{
+	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+	resource_size_t map_start, map_end, busy = 0;
+	struct resource *res;
+	unsigned long align;
+
+	if (!ndd)
+		return 0;
+
+	align = dpa_align(nd_region);
+	if (!align)
+		return 0;
+
+	map_start = nd_mapping->start;
+	map_end = map_start + nd_mapping->size - 1;
+	for_each_dpa_resource(ndd, res) {
+		resource_size_t start, end;
+
+		start = ALIGN_DOWN(res->start, align);
+		end = ALIGN(res->end + 1, align) - 1;
+		if (start >= map_start && start < map_end) {
+			if (end > map_end) {
+				nd_dbg_dpa(nd_region, ndd, res,
+					   "misaligned to iset\n");
+				return 0;
+			}
+			busy += end - start + 1;
+		} else if (end >= map_start && end <= map_end) {
+			busy += end - start + 1;
+		} else if (map_start > start && map_start < end) {
+			/* total eclipse of the mapping */
+			busy += nd_mapping->size;
+		}
+	}
+
+	if (busy < nd_mapping->size)
+		return ALIGN_DOWN(nd_mapping->size - busy, align);
+	return 0;
+}
+
+void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
+{
+	WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
+	kfree(res->name);
+	__release_region(&ndd->dpa, res->start, resource_size(res));
+}
+
+struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
+		struct nd_label_id *label_id, resource_size_t start,
+		resource_size_t n)
+{
+	char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
+	struct resource *res;
+
+	if (!name)
+		return NULL;
+
+	WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
+	res = __request_region(&ndd->dpa, start, n, name, 0);
+	if (!res)
+		kfree(name);
+	return res;
+}
+
+/**
+ * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
+ * @nvdimm: container of dpa-resource-root + labels
+ * @label_id: dpa resource name of the form pmem-<human readable uuid>
+ */
+resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
+		struct nd_label_id *label_id)
+{
+	resource_size_t allocated = 0;
+	struct resource *res;
+
+	for_each_dpa_resource(ndd, res)
+		if (strcmp(res->name, label_id->id) == 0)
+			allocated += resource_size(res);
+
+	return allocated;
+}
+
+static int count_dimms(struct device *dev, void *c)
+{
+	int *count = c;
+
+	if (is_nvdimm(dev))
+		(*count)++;
+	return 0;
+}
+
+int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
+{
+	int count = 0;
+	/* Flush any possible dimm registration failures */
+	nd_synchronize();
+
+	device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
+	dev_dbg(&nvdimm_bus->dev, "count: %d\n", count);
+	if (count != dimm_count)
+		return -ENXIO;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count);
+
+void __exit nvdimm_devs_exit(void)
+{
+	ida_destroy(&dimm_ida);
+}