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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.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 613ffcca6ecb..95ecd7b0fab3 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -103,6 +103,52 @@ static ssize_t mode_store(struct device *dev,
}
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);
+
+ return sprintf(buf, "%lx\n", nd_pfn->align);
+}
+
+static ssize_t __align_store(struct nd_pfn *nd_pfn, const char *buf)
+{
+ unsigned long val;
+ int rc;
+
+ rc = kstrtoul(buf, 0, &val);
+ if (rc)
+ return rc;
+
+ if (!is_power_of_2(val) || val < PAGE_SIZE || val > SZ_1G)
+ return -EINVAL;
+
+ if (nd_pfn->dev.driver)
+ return -EBUSY;
+ else
+ nd_pfn->align = val;
+
+ return 0;
+}
+
+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);
+ ssize_t rc;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ rc = __align_store(nd_pfn, buf);
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+static DEVICE_ATTR_RW(align);
+
static ssize_t uuid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -164,6 +210,7 @@ static struct attribute *nd_pfn_attributes[] = {
&dev_attr_mode.attr,
&dev_attr_namespace.attr,
&dev_attr_uuid.attr,
+ &dev_attr_align.attr,
NULL,
};
@@ -199,6 +246,7 @@ static struct device *__nd_pfn_create(struct nd_region *nd_region,
}
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;
@@ -269,6 +317,12 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn)
return -EINVAL;
}
+ if (nd_pfn->align > nvdimm_namespace_capacity(ndns)) {
+ dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",
+ nd_pfn->align, nvdimm_namespace_capacity(ndns));
+ return -EINVAL;
+ }
+
/*
* These warnings are verbose because they can only trigger in
* the case where the physical address alignment of the
@@ -283,6 +337,13 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn)
return -EBUSY;
}
+ nd_pfn->align = 1UL << ilog2(offset);
+ if (!is_power_of_2(offset) || offset < PAGE_SIZE) {
+ dev_err(&nd_pfn->dev, "bad offset: %#llx dax disabled\n",
+ offset);
+ return -ENXIO;
+ }
+
return 0;
}
EXPORT_SYMBOL(nd_pfn_validate);