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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-18 10:58:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-18 10:58:52 -0700
commit0fe49f70a08d7d25acee3b066a88c654fea26121 (patch)
treea6bcc3efdd88b7848d4262b08e8e62c83db2574a /drivers/dax/bus.c
parentf8c3500cd137867927bc080f4a6e02e0222dd1b8 (diff)
parent23c84eb7837514e16d79ed6d849b13745e0ce688 (diff)
downloadlinux-0fe49f70a08d7d25acee3b066a88c654fea26121.tar.bz2
Merge tag 'dax-for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull dax updates from Dan Williams: "The fruits of a bug hunt in the fsdax implementation with Willy and a small feature update for device-dax: - Fix a hang condition that started triggering after the Xarray conversion of fsdax in the v4.20 kernel. - Add a 'resource' (root-only physical base address) sysfs attribute to device-dax instances to correlate memory-blocks onlined via the kmem driver with a given device instance" * tag 'dax-for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: dax: Fix missed wakeup with PMD faults device-dax: Add a 'resource' attribute
Diffstat (limited to 'drivers/dax/bus.c')
-rw-r--r--drivers/dax/bus.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 5f184e751c82..8fafbeab510a 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -295,6 +295,22 @@ static ssize_t target_node_show(struct device *dev,
}
static DEVICE_ATTR_RO(target_node);
+static unsigned long long dev_dax_resource(struct dev_dax *dev_dax)
+{
+ struct dax_region *dax_region = dev_dax->region;
+
+ return dax_region->res.start;
+}
+
+static ssize_t resource_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dev_dax *dev_dax = to_dev_dax(dev);
+
+ return sprintf(buf, "%#llx\n", dev_dax_resource(dev_dax));
+}
+static DEVICE_ATTR_RO(resource);
+
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -313,6 +329,8 @@ static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n)
if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0)
return 0;
+ if (a == &dev_attr_resource.attr)
+ return 0400;
return a->mode;
}
@@ -320,6 +338,7 @@ static struct attribute *dev_dax_attributes[] = {
&dev_attr_modalias.attr,
&dev_attr_size.attr,
&dev_attr_target_node.attr,
+ &dev_attr_resource.attr,
NULL,
};