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device-dax: rename 'dax_dev' to 'dev_dax' 

In preparation for introducing a struct dax_device type to the kernel
global type namespace, rename dax_dev to dev_dax. A 'dax_device'
instance will be a generic device-driver object for any provider of dax
functionality. A 'dev_dax' object is a device-dax-driver local /
internal instance.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-01-30 21:43:10 -08:00
parent 762026203c
commit 5f0694b300
3 changed files with 109 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

206
drivers/dax/dax.c
View File

@ -57,7 +57,7 @@ struct dax_region {
};
/**
* struct dax_dev - subdivision of a dax region
* struct dev_dax - instance data for a subdivision of a dax region
* @region - parent region
* @dev - device backing the character device
* @cdev - core chardev data
@ -66,7 +66,7 @@ struct dax_region {
* @num_resources - number of physical address extents in this device
* @res - array of physical address ranges
*/
struct dax_dev {
struct dev_dax {
struct dax_region *region;
struct inode *inode;
struct device dev;
@ -323,47 +323,47 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
}
EXPORT_SYMBOL_GPL(alloc_dax_region);
static struct dax_dev *to_dax_dev(struct device *dev)
static struct dev_dax *to_dev_dax(struct device *dev)
{
return container_of(dev, struct dax_dev, dev);
return container_of(dev, struct dev_dax, dev);
}
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dax_dev *dax_dev = to_dax_dev(dev);
struct dev_dax *dev_dax = to_dev_dax(dev);
unsigned long long size = 0;
int i;
for (i = 0; i < dax_dev->num_resources; i++)
size += resource_size(&dax_dev->res[i]);
for (i = 0; i < dev_dax->num_resources; i++)
size += resource_size(&dev_dax->res[i]);
return sprintf(buf, "%llu\n", size);
}
static DEVICE_ATTR_RO(size);
static struct attribute *dax_device_attributes[] = {
static struct attribute *dev_dax_attributes[] = {
&dev_attr_size.attr,
NULL,
};
static const struct attribute_group dax_device_attribute_group = {
.attrs = dax_device_attributes,
static const struct attribute_group dev_dax_attribute_group = {
.attrs = dev_dax_attributes,
};
static const struct attribute_group *dax_attribute_groups[] = {
&dax_device_attribute_group,
&dev_dax_attribute_group,
NULL,
};
static int check_vma(struct dax_dev *dax_dev, struct vm_area_struct *vma,
static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
const char *func)
{
struct dax_region *dax_region = dax_dev->region;
struct device *dev = &dax_dev->dev;
struct dax_region *dax_region = dev_dax->region;
struct device *dev = &dev_dax->dev;
unsigned long mask;
if (!dax_dev->alive)
if (!dev_dax->alive)
return -ENXIO;
/* prevent private mappings from being established */
@ -397,23 +397,23 @@ static int check_vma(struct dax_dev *dax_dev, struct vm_area_struct *vma,
return 0;
}
static phys_addr_t pgoff_to_phys(struct dax_dev *dax_dev, pgoff_t pgoff,
static phys_addr_t pgoff_to_phys(struct dev_dax *dev_dax, 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];
for (i = 0; i < dev_dax->num_resources; i++) {
res = &dev_dax->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 (i < dev_dax->num_resources) {
res = &dev_dax->res[i];
if (phys + size - 1 <= res->end)
return phys;
}
@ -421,19 +421,19 @@ static phys_addr_t pgoff_to_phys(struct dax_dev *dax_dev, pgoff_t pgoff,
return -1;
}
static int __dax_dev_pte_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
static int __dev_dax_pte_fault(struct dev_dax *dev_dax, struct vm_fault *vmf)
{
struct device *dev = &dax_dev->dev;
struct device *dev = &dev_dax->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__))
if (check_vma(dev_dax, vmf->vma, __func__))
return VM_FAULT_SIGBUS;
dax_region = dax_dev->region;
dax_region = dev_dax->region;
if (dax_region->align > PAGE_SIZE) {
dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n",
__func__, dax_region->align, fault_size);
@ -443,7 +443,7 @@ static int __dax_dev_pte_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
if (fault_size != dax_region->align)
return VM_FAULT_SIGBUS;
phys = pgoff_to_phys(dax_dev, vmf->pgoff, PAGE_SIZE);
phys = pgoff_to_phys(dev_dax, vmf->pgoff, PAGE_SIZE);
if (phys == -1) {
dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
vmf->pgoff);
@ -462,20 +462,20 @@ static int __dax_dev_pte_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
return VM_FAULT_NOPAGE;
}
static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
static int __dev_dax_pmd_fault(struct dev_dax *dev_dax, struct vm_fault *vmf)
{
unsigned long pmd_addr = vmf->address & PMD_MASK;
struct device *dev = &dax_dev->dev;
struct device *dev = &dev_dax->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__))
if (check_vma(dev_dax, vmf->vma, __func__))
return VM_FAULT_SIGBUS;
dax_region = dax_dev->region;
dax_region = dev_dax->region;
if (dax_region->align > PMD_SIZE) {
dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n",
__func__, dax_region->align, fault_size);
@ -499,7 +499,7 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
return VM_FAULT_SIGBUS;
pgoff = linear_page_index(vmf->vma, pmd_addr);
phys = pgoff_to_phys(dax_dev, pgoff, PMD_SIZE);
phys = pgoff_to_phys(dev_dax, pgoff, PMD_SIZE);
if (phys == -1) {
dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
pgoff);
@ -513,10 +513,10 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
}
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
static int __dev_dax_pud_fault(struct dev_dax *dev_dax, struct vm_fault *vmf)
{
unsigned long pud_addr = vmf->address & PUD_MASK;
struct device *dev = &dax_dev->dev;
struct device *dev = &dev_dax->dev;
struct dax_region *dax_region;
phys_addr_t phys;
pgoff_t pgoff;
@ -524,10 +524,10 @@ static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
unsigned int fault_size = PUD_SIZE;
if (check_vma(dax_dev, vmf->vma, __func__))
if (check_vma(dev_dax, vmf->vma, __func__))
return VM_FAULT_SIGBUS;
dax_region = dax_dev->region;
dax_region = dev_dax->region;
if (dax_region->align > PUD_SIZE) {
dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n",
__func__, dax_region->align, fault_size);
@ -551,7 +551,7 @@ static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
return VM_FAULT_SIGBUS;
pgoff = linear_page_index(vmf->vma, pud_addr);
phys = pgoff_to_phys(dax_dev, pgoff, PUD_SIZE);
phys = pgoff_to_phys(dev_dax, pgoff, PUD_SIZE);
if (phys == -1) {
dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
pgoff);
@ -564,20 +564,20 @@ static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
vmf->flags & FAULT_FLAG_WRITE);
}
#else
static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
static int __dev_dax_pud_fault(struct dev_dax *dev_dax, 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,
static int dev_dax_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;
struct dev_dax *dev_dax = filp->private_data;
dev_dbg(&dax_dev->dev, "%s: %s: %s (%#lx - %#lx) size = %d\n", __func__,
dev_dbg(&dev_dax->dev, "%s: %s: %s (%#lx - %#lx) size = %d\n", __func__,
current->comm, (vmf->flags & FAULT_FLAG_WRITE)
? "write" : "read",
vmf->vma->vm_start, vmf->vma->vm_end, pe_size);
@ -585,13 +585,13 @@ static int dax_dev_huge_fault(struct vm_fault *vmf,
id = srcu_read_lock(&dax_srcu);
switch (pe_size) {
case PE_SIZE_PTE:
rc = __dax_dev_pte_fault(dax_dev, vmf);
rc = __dev_dax_pte_fault(dev_dax, vmf);
break;
case PE_SIZE_PMD:
rc = __dax_dev_pmd_fault(dax_dev, vmf);
rc = __dev_dax_pmd_fault(dev_dax, vmf);
break;
case PE_SIZE_PUD:
rc = __dax_dev_pud_fault(dax_dev, vmf);
rc = __dev_dax_pud_fault(dev_dax, vmf);
break;
default:
rc = VM_FAULT_SIGBUS;
@ -601,28 +601,28 @@ static int dax_dev_huge_fault(struct vm_fault *vmf,
return rc;
}
static int dax_dev_fault(struct vm_fault *vmf)
static int dev_dax_fault(struct vm_fault *vmf)
{
return dax_dev_huge_fault(vmf, PE_SIZE_PTE);
return dev_dax_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 const struct vm_operations_struct dax_vm_ops = {
.fault = dev_dax_fault,
.huge_fault = dev_dax_huge_fault,
};
static int dax_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct dax_dev *dax_dev = filp->private_data;
struct dev_dax *dev_dax = filp->private_data;
int rc;
dev_dbg(&dax_dev->dev, "%s\n", __func__);
dev_dbg(&dev_dax->dev, "%s\n", __func__);
rc = check_vma(dax_dev, vma, __func__);
rc = check_vma(dev_dax, vma, __func__);
if (rc)
return rc;
vma->vm_ops = &dax_dev_vm_ops;
vma->vm_ops = &dax_vm_ops;
vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
return 0;
}
@ -633,13 +633,13 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
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 dev_dax *dev_dax = filp ? filp->private_data : NULL;
struct dax_region *dax_region;
if (!dax_dev || addr)
if (!dev_dax || addr)
goto out;
dax_region = dax_dev->region;
dax_region = dev_dax->region;
align = dax_region->align;
off = pgoff << PAGE_SHIFT;
off_end = off + len;
@ -664,14 +664,14 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
static int dax_open(struct inode *inode, struct file *filp)
{
struct dax_dev *dax_dev;
struct dev_dax *dev_dax;
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;
dev_dax = container_of(inode->i_cdev, struct dev_dax, cdev);
dev_dbg(&dev_dax->dev, "%s\n", __func__);
inode->i_mapping = dev_dax->inode->i_mapping;
inode->i_mapping->host = dev_dax->inode;
filp->f_mapping = inode->i_mapping;
filp->private_data = dax_dev;
filp->private_data = dev_dax;
inode->i_flags = S_DAX;
return 0;
@ -679,9 +679,9 @@ static int dax_open(struct inode *inode, struct file *filp)
static int dax_release(struct inode *inode, struct file *filp)
{
struct dax_dev *dax_dev = filp->private_data;
struct dev_dax *dev_dax = filp->private_data;
dev_dbg(&dax_dev->dev, "%s\n", __func__);
dev_dbg(&dev_dax->dev, "%s\n", __func__);
return 0;
}
@ -694,55 +694,55 @@ static const struct file_operations dax_fops = {
.mmap = dax_mmap,
};
static void dax_dev_release(struct device *dev)
static void dev_dax_release(struct device *dev)
{
struct dax_dev *dax_dev = to_dax_dev(dev);
struct dax_region *dax_region = dax_dev->region;
struct dev_dax *dev_dax = to_dev_dax(dev);
struct dax_region *dax_region = dev_dax->region;
ida_simple_remove(&dax_region->ida, dax_dev->id);
ida_simple_remove(&dax_region->ida, dev_dax->id);
ida_simple_remove(&dax_minor_ida, MINOR(dev->devt));
dax_region_put(dax_region);
iput(dax_dev->inode);
kfree(dax_dev);
iput(dev_dax->inode);
kfree(dev_dax);
}
static void kill_dax_dev(struct dax_dev *dax_dev)
static void kill_dev_dax(struct dev_dax *dev_dax)
{
/*
* Note, rcu is not protecting the liveness of dax_dev, rcu is
* Note, rcu is not protecting the liveness of dev_dax, rcu is
* ensuring that any fault handlers that might have seen
* dax_dev->alive == true, have completed. Any fault handlers
* dev_dax->alive == true, have completed. Any fault handlers
* that start after synchronize_srcu() has started will abort
* upon seeing dax_dev->alive == false.
* upon seeing dev_dax->alive == false.
*/
dax_dev->alive = false;
dev_dax->alive = false;
synchronize_srcu(&dax_srcu);
unmap_mapping_range(dax_dev->inode->i_mapping, 0, 0, 1);
unmap_mapping_range(dev_dax->inode->i_mapping, 0, 0, 1);
}
static void unregister_dax_dev(void *dev)
static void unregister_dev_dax(void *dev)
{
struct dax_dev *dax_dev = to_dax_dev(dev);
struct dev_dax *dev_dax = to_dev_dax(dev);
dev_dbg(dev, "%s\n", __func__);
kill_dax_dev(dax_dev);
cdev_device_del(&dax_dev->cdev, dev);
kill_dev_dax(dev_dax);
cdev_device_del(&dev_dax->cdev, dev);
put_device(dev);
}
struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
struct resource *res, int count)
{
struct device *parent = dax_region->dev;
struct dax_dev *dax_dev;
struct dev_dax *dev_dax;
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)
dev_dax = kzalloc(sizeof(*dev_dax) + sizeof(*res) * count, GFP_KERNEL);
if (!dev_dax)
return ERR_PTR(-ENOMEM);
for (i = 0; i < count; i++) {
@ -752,16 +752,16 @@ struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
rc = -EINVAL;
break;
}
dax_dev->res[i].start = res[i].start;
dax_dev->res[i].end = res[i].end;
dev_dax->res[i].start = res[i].start;
dev_dax->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;
dev_dax->id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
if (dev_dax->id < 0) {
rc = dev_dax->id;
goto err_id;
}
@ -772,55 +772,55 @@ struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
}
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) {
dev = &dev_dax->dev;
dev_dax->inode = dax_inode_get(&dev_dax->cdev, dev_t);
if (!dev_dax->inode) {
rc = -ENOMEM;
goto err_inode;
}
/* from here on we're committed to teardown via dax_dev_release() */
/* from here on we're committed to teardown via dev_dax_release() */
device_initialize(dev);
cdev = &dax_dev->cdev;
cdev = &dev_dax->cdev;
cdev_init(cdev, &dax_fops);
cdev->owner = parent->driver->owner;
dax_dev->num_resources = count;
dax_dev->alive = true;
dax_dev->region = dax_region;
dev_dax->num_resources = count;
dev_dax->alive = true;
dev_dax->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);
dev->release = dev_dax_release;
dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id);
rc = cdev_device_add(cdev, dev);
if (rc) {
kill_dax_dev(dax_dev);
kill_dev_dax(dev_dax);
put_device(dev);
return ERR_PTR(rc);
}
rc = devm_add_action_or_reset(dax_region->dev, unregister_dax_dev, dev);
rc = devm_add_action_or_reset(dax_region->dev, unregister_dev_dax, dev);
if (rc)
return ERR_PTR(rc);
return dax_dev;
return dev_dax;
err_inode:
ida_simple_remove(&dax_minor_ida, minor);
err_minor:
ida_simple_remove(&dax_region->ida, dax_dev->id);
ida_simple_remove(&dax_region->ida, dev_dax->id);
err_id:
kfree(dax_dev);
kfree(dev_dax);
return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(devm_create_dax_dev);
EXPORT_SYMBOL_GPL(devm_create_dev_dax);
static int __init dax_init(void)
{

4
drivers/dax/dax.h
View File

@ -13,13 +13,13 @@
#ifndef __DAX_H__
#define __DAX_H__
struct device;
struct dax_dev;
struct dev_dax;
struct resource;
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, unsigned int align,
void *addr, unsigned long flags);
struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
struct resource *res, int count);
#endif /* __DAX_H__ */

8
drivers/dax/pmem.c
View File

@ -61,8 +61,8 @@ static int dax_pmem_probe(struct device *dev)
int rc;
void *addr;
struct resource res;
struct dax_dev *dax_dev;
struct nd_pfn_sb *pfn_sb;
struct dev_dax *dev_dax;
struct dax_pmem *dax_pmem;
struct nd_region *nd_region;
struct nd_namespace_io *nsio;
@ -130,12 +130,12 @@ static int dax_pmem_probe(struct device *dev)
return -ENOMEM;
/* TODO: support for subdividing a dax region... */
dax_dev = devm_create_dax_dev(dax_region, &res, 1);
dev_dax = devm_create_dev_dax(dax_region, &res, 1);
/* child dax_dev instances now own the lifetime of the dax_region */
/* child dev_dax instances now own the lifetime of the dax_region */
dax_region_put(dax_region);
return PTR_ERR_OR_ZERO(dax_dev);
return PTR_ERR_OR_ZERO(dev_dax);
}
static struct nd_device_driver dax_pmem_driver = {