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path: root/drivers/nvdimm/pfn_devs.c
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Diffstat (limited to 'drivers/nvdimm/pfn_devs.c')
-rw-r--r--drivers/nvdimm/pfn_devs.c100
1 files changed, 67 insertions, 33 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index e8693fe65e49..6ade2eb7615d 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -1,5 +1,5 @@
/*
- * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ * Copyright(c) 2013-2016 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
@@ -54,10 +54,29 @@ struct nd_pfn *to_nd_pfn(struct device *dev)
}
EXPORT_SYMBOL(to_nd_pfn);
+static struct nd_pfn *to_nd_pfn_safe(struct device *dev)
+{
+ /*
+ * pfn device attributes are re-used by dax device instances, so we
+ * need to be careful to correct device-to-nd_pfn conversion.
+ */
+ if (is_nd_pfn(dev))
+ return to_nd_pfn(dev);
+
+ if (is_nd_dax(dev)) {
+ struct nd_dax *nd_dax = to_nd_dax(dev);
+
+ return &nd_dax->nd_pfn;
+ }
+
+ WARN_ON(1);
+ return NULL;
+}
+
static ssize_t mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
switch (nd_pfn->mode) {
case PFN_MODE_RAM:
@@ -72,7 +91,7 @@ static ssize_t mode_show(struct device *dev,
static ssize_t mode_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc = 0;
device_lock(dev);
@@ -106,7 +125,7 @@ static DEVICE_ATTR_RW(mode);
static ssize_t align_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
return sprintf(buf, "%lx\n", nd_pfn->align);
}
@@ -134,7 +153,7 @@ static ssize_t __align_store(struct nd_pfn *nd_pfn, const char *buf)
static ssize_t align_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
@@ -152,7 +171,7 @@ static DEVICE_ATTR_RW(align);
static ssize_t uuid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
if (nd_pfn->uuid)
return sprintf(buf, "%pUb\n", nd_pfn->uuid);
@@ -162,7 +181,7 @@ static ssize_t uuid_show(struct device *dev,
static ssize_t uuid_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
@@ -178,7 +197,7 @@ static DEVICE_ATTR_RW(uuid);
static ssize_t namespace_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
nvdimm_bus_lock(dev);
@@ -191,7 +210,7 @@ static ssize_t namespace_show(struct device *dev,
static ssize_t namespace_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
@@ -209,7 +228,7 @@ static DEVICE_ATTR_RW(namespace);
static ssize_t resource_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
@@ -235,7 +254,7 @@ static DEVICE_ATTR_RO(resource);
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
@@ -270,7 +289,7 @@ static struct attribute *nd_pfn_attributes[] = {
NULL,
};
-static struct attribute_group nd_pfn_attribute_group = {
+struct attribute_group nd_pfn_attribute_group = {
.attrs = nd_pfn_attributes,
};
@@ -281,15 +300,31 @@ static const struct attribute_group *nd_pfn_attribute_groups[] = {
NULL,
};
-static struct device *__nd_pfn_create(struct nd_region *nd_region,
+struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
struct nd_namespace_common *ndns)
{
- struct nd_pfn *nd_pfn;
- struct device *dev;
+ struct device *dev = &nd_pfn->dev;
- /* we can only create pages for contiguous ranged of pmem */
- if (!is_nd_pmem(&nd_region->dev))
+ if (!nd_pfn)
+ return NULL;
+
+ nd_pfn->mode = PFN_MODE_NONE;
+ nd_pfn->align = HPAGE_SIZE;
+ dev = &nd_pfn->dev;
+ device_initialize(&nd_pfn->dev);
+ if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
+ dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
+ __func__, dev_name(ndns->claim));
+ put_device(dev);
return NULL;
+ }
+ return dev;
+}
+
+static struct nd_pfn *nd_pfn_alloc(struct nd_region *nd_region)
+{
+ struct nd_pfn *nd_pfn;
+ struct device *dev;
nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL);
if (!nd_pfn)
@@ -301,29 +336,27 @@ static struct device *__nd_pfn_create(struct nd_region *nd_region,
return NULL;
}
- nd_pfn->mode = PFN_MODE_NONE;
- nd_pfn->align = HPAGE_SIZE;
dev = &nd_pfn->dev;
dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id);
- dev->parent = &nd_region->dev;
- dev->type = &nd_pfn_device_type;
dev->groups = nd_pfn_attribute_groups;
- device_initialize(&nd_pfn->dev);
- if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
- dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
- __func__, dev_name(ndns->claim));
- put_device(dev);
- return NULL;
- }
- return dev;
+ dev->type = &nd_pfn_device_type;
+ dev->parent = &nd_region->dev;
+
+ return nd_pfn;
}
struct device *nd_pfn_create(struct nd_region *nd_region)
{
- struct device *dev = __nd_pfn_create(nd_region, NULL);
+ struct nd_pfn *nd_pfn;
+ struct device *dev;
+
+ if (!is_nd_pmem(&nd_region->dev))
+ return NULL;
+
+ nd_pfn = nd_pfn_alloc(nd_region);
+ dev = nd_pfn_devinit(nd_pfn, NULL);
- if (dev)
- __nd_device_register(dev);
+ __nd_device_register(dev);
return dev;
}
@@ -423,7 +456,8 @@ int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
return -ENODEV;
nvdimm_bus_lock(&ndns->dev);
- pfn_dev = __nd_pfn_create(nd_region, ndns);
+ nd_pfn = nd_pfn_alloc(nd_region);
+ pfn_dev = nd_pfn_devinit(nd_pfn, ndns);
nvdimm_bus_unlock(&ndns->dev);
if (!pfn_dev)
return -ENOMEM;
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-30 21:11:41 +0300