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/dax_devs.c b/drivers/nvdimm/dax_devs.c
new file mode 100644
index 0000000..f90f754
--- /dev/null
+++ b/drivers/nvdimm/dax_devs.c
@@ -0,0 +1,99 @@
+/*
+ * 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
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/device.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include "nd-core.h"
+#include "nd.h"
+
+static void nd_dax_release(struct device *dev)
+{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_dax *nd_dax = to_nd_dax(dev);
+ struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
+
+ dev_dbg(dev, "%s\n", __func__);
+ nd_detach_ndns(dev, &nd_pfn->ndns);
+ ida_simple_remove(&nd_region->dax_ida, nd_pfn->id);
+ kfree(nd_pfn->uuid);
+ kfree(nd_dax);
+}
+
+static struct device_type nd_dax_device_type = {
+ .name = "nd_dax",
+ .release = nd_dax_release,
+};
+
+bool is_nd_dax(struct device *dev)
+{
+ return dev ? dev->type == &nd_dax_device_type : false;
+}
+EXPORT_SYMBOL(is_nd_dax);
+
+struct nd_dax *to_nd_dax(struct device *dev)
+{
+ struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev);
+
+ WARN_ON(!is_nd_dax(dev));
+ return nd_dax;
+}
+EXPORT_SYMBOL(to_nd_dax);
+
+static const struct attribute_group *nd_dax_attribute_groups[] = {
+ &nd_pfn_attribute_group,
+ &nd_device_attribute_group,
+ &nd_numa_attribute_group,
+ NULL,
+};
+
+static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region)
+{
+ struct nd_pfn *nd_pfn;
+ struct nd_dax *nd_dax;
+ struct device *dev;
+
+ nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL);
+ if (!nd_dax)
+ return NULL;
+
+ nd_pfn = &nd_dax->nd_pfn;
+ nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL);
+ if (nd_pfn->id < 0) {
+ kfree(nd_dax);
+ return NULL;
+ }
+
+ dev = &nd_pfn->dev;
+ dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id);
+ dev->groups = nd_dax_attribute_groups;
+ dev->type = &nd_dax_device_type;
+ dev->parent = &nd_region->dev;
+
+ return nd_dax;
+}
+
+struct device *nd_dax_create(struct nd_region *nd_region)
+{
+ struct device *dev = NULL;
+ struct nd_dax *nd_dax;
+
+ if (!is_nd_pmem(&nd_region->dev))
+ return NULL;
+
+ nd_dax = nd_dax_alloc(nd_region);
+ if (nd_dax)
+ dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL);
+ __nd_device_register(dev);
+ return dev;
+}