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authorDan Williams <dan.j.williams@intel.com>2016-03-11 21:15:36 +0300
committerDan Williams <dan.j.williams@intel.com>2016-05-10 01:35:42 +0300
commitcd03412a51ac4cb3001a8cdfae4560c9602f3387 (patch)
treec2d501759d7d96fab9a0f70eefba139876bb12de /drivers/nvdimm/region_devs.c
parent0bfb8dd3edd6e423b5053c86e10c97e92cf205ea (diff)
downloadlinux-cd03412a51ac4cb3001a8cdfae4560c9602f3387.tar.xz
libnvdimm, dax: introduce device-dax infrastructure
Device DAX is the device-centric analogue of Filesystem DAX (CONFIG_FS_DAX). It allows persistent memory ranges to be allocated and mapped without need of an intervening file system. This initial infrastructure arranges for a libnvdimm pfn-device to be represented as a different device-type so that it can be attached to a driver other than the pmem driver. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/region_devs.c')
-rw-r--r--drivers/nvdimm/region_devs.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 139bf71ca549..9e1b054e0e61 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -306,6 +306,23 @@ static ssize_t pfn_seed_show(struct device *dev,
}
static DEVICE_ATTR_RO(pfn_seed);
+static ssize_t dax_seed_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ ssize_t rc;
+
+ nvdimm_bus_lock(dev);
+ if (nd_region->dax_seed)
+ rc = sprintf(buf, "%s\n", dev_name(nd_region->dax_seed));
+ else
+ rc = sprintf(buf, "\n");
+ nvdimm_bus_unlock(dev);
+
+ return rc;
+}
+static DEVICE_ATTR_RO(dax_seed);
+
static ssize_t read_only_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -335,6 +352,7 @@ static struct attribute *nd_region_attributes[] = {
&dev_attr_mappings.attr,
&dev_attr_btt_seed.attr,
&dev_attr_pfn_seed.attr,
+ &dev_attr_dax_seed.attr,
&dev_attr_read_only.attr,
&dev_attr_set_cookie.attr,
&dev_attr_available_size.attr,
@@ -353,6 +371,9 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr)
return 0;
+ if (!is_nd_pmem(dev) && a == &dev_attr_dax_seed.attr)
+ return 0;
+
if (a != &dev_attr_set_cookie.attr
&& a != &dev_attr_available_size.attr)
return a->mode;
@@ -441,6 +462,13 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
nd_region_create_pfn_seed(nd_region);
nvdimm_bus_unlock(dev);
}
+ if (is_nd_dax(dev) && probe) {
+ nd_region = to_nd_region(dev->parent);
+ nvdimm_bus_lock(dev);
+ if (nd_region->dax_seed == dev)
+ nd_region_create_dax_seed(nd_region);
+ nvdimm_bus_unlock(dev);
+ }
}
void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
@@ -718,6 +746,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
ida_init(&nd_region->ns_ida);
ida_init(&nd_region->btt_ida);
ida_init(&nd_region->pfn_ida);
+ ida_init(&nd_region->dax_ida);
dev = &nd_region->dev;
dev_set_name(dev, "region%d", nd_region->id);
dev->parent = &nvdimm_bus->dev;