1 files changed, 0 insertions, 862 deletions

diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
deleted file mode 100644
index 806f180c80d8..000000000000
--- a/drivers/dax/dax.c
+++ /dev/null
@@ -1,862 +0,0 @@
-/*
- * Copyright(c) 2016 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- */
-#include <linux/pagemap.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/magic.h>
-#include <linux/mount.h>
-#include <linux/pfn_t.h>
-#include <linux/hash.h>
-#include <linux/cdev.h>
-#include <linux/slab.h>
-#include <linux/dax.h>
-#include <linux/fs.h>
-#include <linux/mm.h>
-#include "dax.h"
-
-static dev_t dax_devt;
-DEFINE_STATIC_SRCU(dax_srcu);
-static struct class *dax_class;
-static DEFINE_IDA(dax_minor_ida);
-static int nr_dax = CONFIG_NR_DEV_DAX;
-module_param(nr_dax, int, S_IRUGO);
-static struct vfsmount *dax_mnt;
-static struct kmem_cache *dax_cache __read_mostly;
-static struct super_block *dax_superblock __read_mostly;
-MODULE_PARM_DESC(nr_dax, "max number of device-dax instances");
-
-/**
- * struct dax_region - mapping infrastructure for dax devices
- * @id: kernel-wide unique region for a memory range
- * @base: linear address corresponding to @res
- * @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;
-	struct ida ida;
-	void *base;
-	struct kref kref;
-	struct device *dev;
-	unsigned int align;
-	struct resource res;
-	unsigned long pfn_flags;
-};
-
-/**
- * struct dax_dev - subdivision of a dax region
- * @region - parent region
- * @dev - device backing the character device
- * @cdev - core chardev data
- * @alive - !alive + srcu grace period == no new mappings can be established
- * @id - child id in the region
- * @num_resources - number of physical address extents in this device
- * @res - array of physical address ranges
- */
-struct dax_dev {
-	struct dax_region *region;
-	struct inode *inode;
-	struct device dev;
-	struct cdev cdev;
-	bool alive;
-	int id;
-	int num_resources;
-	struct resource res[0];
-};
-
-static ssize_t id_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct dax_region *dax_region;
-	ssize_t rc = -ENXIO;
-
-	device_lock(dev);
-	dax_region = dev_get_drvdata(dev);
-	if (dax_region)
-		rc = sprintf(buf, "%d\n", dax_region->id);
-	device_unlock(dev);
-
-	return rc;
-}
-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;
-	ssize_t rc = -ENXIO;
-
-	device_lock(dev);
-	dax_region = dev_get_drvdata(dev);
-	if (dax_region)
-		rc = sprintf(buf, "%llu\n", (unsigned long long)
-				resource_size(&dax_region->res));
-	device_unlock(dev);
-
-	return rc;
-}
-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;
-	ssize_t rc = -ENXIO;
-
-	device_lock(dev);
-	dax_region = dev_get_drvdata(dev);
-	if (dax_region)
-		rc = sprintf(buf, "%u\n", dax_region->align);
-	device_unlock(dev);
-
-	return rc;
-}
-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 struct inode *dax_alloc_inode(struct super_block *sb)
-{
-	return kmem_cache_alloc(dax_cache, GFP_KERNEL);
-}
-
-static void dax_i_callback(struct rcu_head *head)
-{
-	struct inode *inode = container_of(head, struct inode, i_rcu);
-
-	kmem_cache_free(dax_cache, inode);
-}
-
-static void dax_destroy_inode(struct inode *inode)
-{
-	call_rcu(&inode->i_rcu, dax_i_callback);
-}
-
-static const struct super_operations dax_sops = {
-	.statfs = simple_statfs,
-	.alloc_inode = dax_alloc_inode,
-	.destroy_inode = dax_destroy_inode,
-	.drop_inode = generic_delete_inode,
-};
-
-static struct dentry *dax_mount(struct file_system_type *fs_type,
-		int flags, const char *dev_name, void *data)
-{
-	return mount_pseudo(fs_type, "dax:", &dax_sops, NULL, DAXFS_MAGIC);
-}
-
-static struct file_system_type dax_type = {
-	.name = "dax",
-	.mount = dax_mount,
-	.kill_sb = kill_anon_super,
-};
-
-static int dax_test(struct inode *inode, void *data)
-{
-	return inode->i_cdev == data;
-}
-
-static int dax_set(struct inode *inode, void *data)
-{
-	inode->i_cdev = data;
-	return 0;
-}
-
-static struct inode *dax_inode_get(struct cdev *cdev, dev_t devt)
-{
-	struct inode *inode;
-
-	inode = iget5_locked(dax_superblock, hash_32(devt + DAXFS_MAGIC, 31),
-			dax_test, dax_set, cdev);
-
-	if (!inode)
-		return NULL;
-
-	if (inode->i_state & I_NEW) {
-		inode->i_mode = S_IFCHR;
-		inode->i_flags = S_DAX;
-		inode->i_rdev = devt;
-		mapping_set_gfp_mask(&inode->i_data, GFP_USER);
-		unlock_new_inode(inode);
-	}
-	return inode;
-}
-
-static void init_once(void *inode)
-{
-	inode_init_once(inode);
-}
-
-static int dax_inode_init(void)
-{
-	int rc;
-
-	dax_cache = kmem_cache_create("dax_cache", sizeof(struct inode), 0,
-			(SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
-			 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
-			init_once);
-	if (!dax_cache)
-		return -ENOMEM;
-
-	rc = register_filesystem(&dax_type);
-	if (rc)
-		goto err_register_fs;
-
-	dax_mnt = kern_mount(&dax_type);
-	if (IS_ERR(dax_mnt)) {
-		rc = PTR_ERR(dax_mnt);
-		goto err_mount;
-	}
-	dax_superblock = dax_mnt->mnt_sb;
-
-	return 0;
-
- err_mount:
-	unregister_filesystem(&dax_type);
- err_register_fs:
-	kmem_cache_destroy(dax_cache);
-
-	return rc;
-}
-
-static void dax_inode_exit(void)
-{
-	kern_unmount(dax_mnt);
-	unregister_filesystem(&dax_type);
-	kmem_cache_destroy(dax_cache);
-}
-
-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, unsigned int align, void *addr,
-		unsigned 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;
-	ida_init(&dax_region->ida);
-	dax_region->align = align;
-	dax_region->dev = parent;
-	dax_region->base = addr;
-	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 struct dax_dev *to_dax_dev(struct device *dev)
-{
-	return container_of(dev, struct dax_dev, dev);
-}
-
-static ssize_t size_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct dax_dev *dax_dev = to_dax_dev(dev);
-	unsigned long long size = 0;
-	int i;
-
-	for (i = 0; i < dax_dev->num_resources; i++)
-		size += resource_size(&dax_dev->res[i]);
-
-	return sprintf(buf, "%llu\n", size);
-}
-static DEVICE_ATTR_RO(size);
-
-static struct attribute *dax_device_attributes[] = {
-	&dev_attr_size.attr,
-	NULL,
-};
-
-static const struct attribute_group dax_device_attribute_group = {
-	.attrs = dax_device_attributes,
-};
-
-static const struct attribute_group *dax_attribute_groups[] = {
-	&dax_device_attribute_group,
-	NULL,
-};
-
-static int check_vma(struct dax_dev *dax_dev, struct vm_area_struct *vma,
-		const char *func)
-{
-	struct dax_region *dax_region = dax_dev->region;
-	struct device *dev = &dax_dev->dev;
-	unsigned long mask;
-
-	if (!dax_dev->alive)
-		return -ENXIO;
-
-	/* prevent private mappings from being established */
-	if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
-		dev_info(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(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(dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n",
-				current->comm, func);
-		return -EINVAL;
-	}
-
-	if (!vma_is_dax(vma)) {
-		dev_info(dev, "%s: %s: fail, vma is not DAX capable\n",
-				current->comm, func);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static phys_addr_t pgoff_to_phys(struct dax_dev *dax_dev, pgoff_t pgoff,
-		unsigned long size)
-{
-	struct resource *res;
-	phys_addr_t phys;
-	int i;
-
-	for (i = 0; i < dax_dev->num_resources; i++) {
-		res = &dax_dev->res[i];
-		phys = pgoff * PAGE_SIZE + res->start;
-		if (phys >= res->start && phys <= res->end)
-			break;
-		pgoff -= PHYS_PFN(resource_size(res));
-	}
-
-	if (i < dax_dev->num_resources) {
-		res = &dax_dev->res[i];
-		if (phys + size - 1 <= res->end)
-			return phys;
-	}
-
-	return -1;
-}
-
-static int __dax_dev_pte_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
-{
-	struct device *dev = &dax_dev->dev;
-	struct dax_region *dax_region;
-	int rc = VM_FAULT_SIGBUS;
-	phys_addr_t phys;
-	pfn_t pfn;
-	unsigned int fault_size = PAGE_SIZE;
-
-	if (check_vma(dax_dev, vmf->vma, __func__))
-		return VM_FAULT_SIGBUS;
-
-	dax_region = dax_dev->region;
-	if (dax_region->align > PAGE_SIZE) {
-		dev_dbg(dev, "%s: alignment > fault size\n", __func__);
-		return VM_FAULT_SIGBUS;
-	}
-
-	if (fault_size != dax_region->align)
-		return VM_FAULT_SIGBUS;
-
-	phys = pgoff_to_phys(dax_dev, vmf->pgoff, PAGE_SIZE);
-	if (phys == -1) {
-		dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
-				vmf->pgoff);
-		return VM_FAULT_SIGBUS;
-	}
-
-	pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
-
-	rc = vm_insert_mixed(vmf->vma, vmf->address, pfn);
-
-	if (rc == -ENOMEM)
-		return VM_FAULT_OOM;
-	if (rc < 0 && rc != -EBUSY)
-		return VM_FAULT_SIGBUS;
-
-	return VM_FAULT_NOPAGE;
-}
-
-static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
-{
-	unsigned long pmd_addr = vmf->address & PMD_MASK;
-	struct device *dev = &dax_dev->dev;
-	struct dax_region *dax_region;
-	phys_addr_t phys;
-	pgoff_t pgoff;
-	pfn_t pfn;
-	unsigned int fault_size = PMD_SIZE;
-
-	if (check_vma(dax_dev, vmf->vma, __func__))
-		return VM_FAULT_SIGBUS;
-
-	dax_region = dax_dev->region;
-	if (dax_region->align > PMD_SIZE) {
-		dev_dbg(dev, "%s: alignment > fault size\n", __func__);
-		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, "%s: alignment > fault size\n", __func__);
-		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 = pgoff_to_phys(dax_dev, pgoff, PMD_SIZE);
-	if (phys == -1) {
-		dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
-				pgoff);
-		return VM_FAULT_SIGBUS;
-	}
-
-	pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
-
-	return vmf_insert_pfn_pmd(vmf->vma, vmf->address, vmf->pmd, pfn,
-			vmf->flags & FAULT_FLAG_WRITE);
-}
-
-#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
-static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
-{
-	unsigned long pud_addr = vmf->address & PUD_MASK;
-	struct device *dev = &dax_dev->dev;
-	struct dax_region *dax_region;
-	phys_addr_t phys;
-	pgoff_t pgoff;
-	pfn_t pfn;
-	unsigned int fault_size = PUD_SIZE;
-
-
-	if (check_vma(dax_dev, vmf->vma, __func__))
-		return VM_FAULT_SIGBUS;
-
-	dax_region = dax_dev->region;
-	if (dax_region->align > PUD_SIZE) {
-		dev_dbg(dev, "%s: alignment > fault size\n", __func__);
-		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, "%s: alignment > fault size\n", __func__);
-		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 = pgoff_to_phys(dax_dev, pgoff, PUD_SIZE);
-	if (phys == -1) {
-		dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
-				pgoff);
-		return VM_FAULT_SIGBUS;
-	}
-
-	pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
-
-	return vmf_insert_pfn_pud(vmf->vma, vmf->address, vmf->pud, pfn,
-			vmf->flags & FAULT_FLAG_WRITE);
-}
-#else
-static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
-{
-	return VM_FAULT_FALLBACK;
-}
-#endif /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
-
-static int dax_dev_huge_fault(struct vm_fault *vmf,
-		enum page_entry_size pe_size)
-{
-	int rc, id;
-	struct file *filp = vmf->vma->vm_file;
-	struct dax_dev *dax_dev = filp->private_data;
-
-	dev_dbg(&dax_dev->dev, "%s: %s: %s (%#lx - %#lx)\n", __func__,
-			current->comm, (vmf->flags & FAULT_FLAG_WRITE)
-			? "write" : "read",
-			vmf->vma->vm_start, vmf->vma->vm_end);
-
-	id = srcu_read_lock(&dax_srcu);
-	switch (pe_size) {
-	case PE_SIZE_PTE:
-		rc = __dax_dev_pte_fault(dax_dev, vmf);
-		break;
-	case PE_SIZE_PMD:
-		rc = __dax_dev_pmd_fault(dax_dev, vmf);
-		break;
-	case PE_SIZE_PUD:
-		rc = __dax_dev_pud_fault(dax_dev, vmf);
-		break;
-	default:
-		return VM_FAULT_FALLBACK;
-	}
-	srcu_read_unlock(&dax_srcu, id);
-
-	return rc;
-}
-
-static int dax_dev_fault(struct vm_fault *vmf)
-{
-	return dax_dev_huge_fault(vmf, PE_SIZE_PTE);
-}
-
-static const struct vm_operations_struct dax_dev_vm_ops = {
-	.fault = dax_dev_fault,
-	.huge_fault = dax_dev_huge_fault,
-};
-
-static int dax_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	struct dax_dev *dax_dev = filp->private_data;
-	int rc;
-
-	dev_dbg(&dax_dev->dev, "%s\n", __func__);
-
-	rc = check_vma(dax_dev, vma, __func__);
-	if (rc)
-		return rc;
-
-	vma->vm_ops = &dax_dev_vm_ops;
-	vma->vm_flags |= VM_MIXEDMAP | 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 dax_dev *dax_dev = filp ? filp->private_data : NULL;
-	struct dax_region *dax_region;
-
-	if (!dax_dev || addr)
-		goto out;
-
-	dax_region = dax_dev->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 int dax_open(struct inode *inode, struct file *filp)
-{
-	struct dax_dev *dax_dev;
-
-	dax_dev = container_of(inode->i_cdev, struct dax_dev, cdev);
-	dev_dbg(&dax_dev->dev, "%s\n", __func__);
-	inode->i_mapping = dax_dev->inode->i_mapping;
-	inode->i_mapping->host = dax_dev->inode;
-	filp->f_mapping = inode->i_mapping;
-	filp->private_data = dax_dev;
-	inode->i_flags = S_DAX;
-
-	return 0;
-}
-
-static int dax_release(struct inode *inode, struct file *filp)
-{
-	struct dax_dev *dax_dev = filp->private_data;
-
-	dev_dbg(&dax_dev->dev, "%s\n", __func__);
-	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,
-};
-
-static void dax_dev_release(struct device *dev)
-{
-	struct dax_dev *dax_dev = to_dax_dev(dev);
-	struct dax_region *dax_region = dax_dev->region;
-
-	ida_simple_remove(&dax_region->ida, dax_dev->id);
-	ida_simple_remove(&dax_minor_ida, MINOR(dev->devt));
-	dax_region_put(dax_region);
-	iput(dax_dev->inode);
-	kfree(dax_dev);
-}
-
-static void unregister_dax_dev(void *dev)
-{
-	struct dax_dev *dax_dev = to_dax_dev(dev);
-	struct cdev *cdev = &dax_dev->cdev;
-
-	dev_dbg(dev, "%s\n", __func__);
-
-	/*
-	 * Note, rcu is not protecting the liveness of dax_dev, rcu is
-	 * ensuring that any fault handlers that might have seen
-	 * dax_dev->alive == true, have completed.  Any fault handlers
-	 * that start after synchronize_srcu() has started will abort
-	 * upon seeing dax_dev->alive == false.
-	 */
-	dax_dev->alive = false;
-	synchronize_srcu(&dax_srcu);
-	unmap_mapping_range(dax_dev->inode->i_mapping, 0, 0, 1);
-	cdev_del(cdev);
-	device_unregister(dev);
-}
-
-struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
-		struct resource *res, int count)
-{
-	struct device *parent = dax_region->dev;
-	struct dax_dev *dax_dev;
-	int rc = 0, minor, i;
-	struct device *dev;
-	struct cdev *cdev;
-	dev_t dev_t;
-
-	dax_dev = kzalloc(sizeof(*dax_dev) + sizeof(*res) * count, GFP_KERNEL);
-	if (!dax_dev)
-		return ERR_PTR(-ENOMEM);
-
-	for (i = 0; i < count; i++) {
-		if (!IS_ALIGNED(res[i].start, dax_region->align)
-				|| !IS_ALIGNED(resource_size(&res[i]),
-					dax_region->align)) {
-			rc = -EINVAL;
-			break;
-		}
-		dax_dev->res[i].start = res[i].start;
-		dax_dev->res[i].end = res[i].end;
-	}
-
-	if (i < count)
-		goto err_id;
-
-	dax_dev->id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
-	if (dax_dev->id < 0) {
-		rc = dax_dev->id;
-		goto err_id;
-	}
-
-	minor = ida_simple_get(&dax_minor_ida, 0, 0, GFP_KERNEL);
-	if (minor < 0) {
-		rc = minor;
-		goto err_minor;
-	}
-
-	dev_t = MKDEV(MAJOR(dax_devt), minor);
-	dev = &dax_dev->dev;
-	dax_dev->inode = dax_inode_get(&dax_dev->cdev, dev_t);
-	if (!dax_dev->inode) {
-		rc = -ENOMEM;
-		goto err_inode;
-	}
-
-	/* device_initialize() so cdev can reference kobj parent */
-	device_initialize(dev);
-
-	cdev = &dax_dev->cdev;
-	cdev_init(cdev, &dax_fops);
-	cdev->owner = parent->driver->owner;
-	cdev->kobj.parent = &dev->kobj;
-	rc = cdev_add(&dax_dev->cdev, dev_t, 1);
-	if (rc)
-		goto err_cdev;
-
-	/* from here on we're committed to teardown via dax_dev_release() */
-	dax_dev->num_resources = count;
-	dax_dev->alive = true;
-	dax_dev->region = dax_region;
-	kref_get(&dax_region->kref);
-
-	dev->devt = dev_t;
-	dev->class = dax_class;
-	dev->parent = parent;
-	dev->groups = dax_attribute_groups;
-	dev->release = dax_dev_release;
-	dev_set_name(dev, "dax%d.%d", dax_region->id, dax_dev->id);
-	rc = device_add(dev);
-	if (rc) {
-		put_device(dev);
-		return ERR_PTR(rc);
-	}
-
-	rc = devm_add_action_or_reset(dax_region->dev, unregister_dax_dev, dev);
-	if (rc)
-		return ERR_PTR(rc);
-
-	return dax_dev;
-
- err_cdev:
-	iput(dax_dev->inode);
- err_inode:
-	ida_simple_remove(&dax_minor_ida, minor);
- err_minor:
-	ida_simple_remove(&dax_region->ida, dax_dev->id);
- err_id:
-	kfree(dax_dev);
-
-	return ERR_PTR(rc);
-}
-EXPORT_SYMBOL_GPL(devm_create_dax_dev);
-
-static int __init dax_init(void)
-{
-	int rc;
-
-	rc = dax_inode_init();
-	if (rc)
-		return rc;
-
-	nr_dax = max(nr_dax, 256);
-	rc = alloc_chrdev_region(&dax_devt, 0, nr_dax, "dax");
-	if (rc)
-		goto err_chrdev;
-
-	dax_class = class_create(THIS_MODULE, "dax");
-	if (IS_ERR(dax_class)) {
-		rc = PTR_ERR(dax_class);
-		goto err_class;
-	}
-
-	return 0;
-
- err_class:
-	unregister_chrdev_region(dax_devt, nr_dax);
- err_chrdev:
-	dax_inode_exit();
-	return rc;
-}
-
-static void __exit dax_exit(void)
-{
-	class_destroy(dax_class);
-	unregister_chrdev_region(dax_devt, nr_dax);
-	ida_destroy(&dax_minor_ida);
-	dax_inode_exit();
-}
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_LICENSE("GPL v2");
-subsys_initcall(dax_init);
-module_exit(dax_exit);