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>
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index e5ad516..c5e3196 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1288,6 +1288,8 @@
mode = "safe";
else if (claim && is_nd_pfn(claim))
mode = "memory";
+ else if (claim && is_nd_dax(claim))
+ mode = "dax";
else if (!claim && pmem_should_map_pages(dev))
mode = "memory";
else
@@ -1379,14 +1381,17 @@
{
struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
+ struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
struct nd_namespace_common *ndns = NULL;
resource_size_t size;
- if (nd_btt || nd_pfn) {
+ if (nd_btt || nd_pfn || nd_dax) {
if (nd_btt)
ndns = nd_btt->ndns;
else if (nd_pfn)
ndns = nd_pfn->ndns;
+ else if (nd_dax)
+ ndns = nd_dax->nd_pfn.ndns;
if (!ndns)
return ERR_PTR(-ENODEV);
@@ -1779,6 +1784,18 @@
nd_device_register(nd_region->ns_seed);
}
+void nd_region_create_dax_seed(struct nd_region *nd_region)
+{
+ WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
+ nd_region->dax_seed = nd_dax_create(nd_region);
+ /*
+ * Seed creation failures are not fatal, provisioning is simply
+ * disabled until memory becomes available
+ */
+ if (!nd_region->dax_seed)
+ dev_err(&nd_region->dev, "failed to create dax namespace\n");
+}
+
void nd_region_create_pfn_seed(struct nd_region *nd_region)
{
WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
