2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 #include <linux/module.h>
14 #include <linux/device.h>
18 static int nd_region_probe(struct device *dev)
21 struct nd_region_namespaces *num_ns;
22 struct nd_region *nd_region = to_nd_region(dev);
23 int rc = nd_region_register_namespaces(nd_region, &err);
25 num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL);
33 num_ns->count = rc + err;
34 dev_set_drvdata(dev, num_ns);
36 if (rc && err && rc == err)
39 nd_region->btt_seed = nd_btt_create(nd_region);
44 * Given multiple namespaces per region, we do not want to
45 * disable all the successfully registered peer namespaces upon
46 * a single registration failure. If userspace is missing a
47 * namespace that it expects it can disable/re-enable the region
48 * to retry discovery after correcting the failure.
49 * <regionX>/namespaces returns the current
50 * "<async-registered>/<total>" namespace count.
52 dev_err(dev, "failed to register %d namespace%s, continuing...\n",
53 err, err == 1 ? "" : "s");
57 static int child_unregister(struct device *dev, void *data)
59 nd_device_unregister(dev, ND_SYNC);
63 static int nd_region_remove(struct device *dev)
65 struct nd_region *nd_region = to_nd_region(dev);
67 /* flush attribute readers and disable */
69 nd_region->ns_seed = NULL;
70 nd_region->btt_seed = NULL;
71 dev_set_drvdata(dev, NULL);
72 nvdimm_bus_unlock(dev);
74 device_for_each_child(dev, NULL, child_unregister);
78 static struct nd_device_driver nd_region_driver = {
79 .probe = nd_region_probe,
80 .remove = nd_region_remove,
84 .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM,
87 int __init nd_region_init(void)
89 return nd_driver_register(&nd_region_driver);
92 void nd_region_exit(void)
94 driver_unregister(&nd_region_driver.drv);
97 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM);
98 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);