projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 3d88002e DW |
1 | /* |
| 2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
| 3 | * | |
| 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. | |
| 7 | * | |
| 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. | |
| 12 | */ | |
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/device.h> | |
| 15 | #include <linux/nd.h> | |
| 16 | #include "nd.h" | |
| 17 | ||
| 18 | static int nd_region_probe(struct device *dev) | |
| 19 | { | |
| 20 | int err; | |
| 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); | |
| 24 | ||
| 25 | num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL); | |
| 26 | if (!num_ns) | |
| 27 | return -ENOMEM; | |
| 28 | ||
| 29 | if (rc < 0) | |
| 30 | return rc; | |
| 31 | ||
| 32 | num_ns->active = rc; | |
| 33 | num_ns->count = rc + err; | |
| 34 | dev_set_drvdata(dev, num_ns); | |
| 35 | ||
| 36 | if (err == 0) | |
| 37 | return 0; | |
| 38 | ||
| 39 | if (rc == err) | |
| 40 | return -ENODEV; | |
| 41 | ||
| 42 | /* | |
| 43 | * Given multiple namespaces per region, we do not want to | |
| 44 | * disable all the successfully registered peer namespaces upon | |
| 45 | * a single registration failure. If userspace is missing a | |
| 46 | * namespace that it expects it can disable/re-enable the region | |
| 47 | * to retry discovery after correcting the failure. | |
| 48 | * <regionX>/namespaces returns the current | |
| 49 | * "<async-registered>/<total>" namespace count. | |
| 50 | */ | |
| 51 | dev_err(dev, "failed to register %d namespace%s, continuing...\n", | |
| 52 | err, err == 1 ? "" : "s"); | |
| 53 | return 0; | |
| 54 | } | |
| 55 | ||
| 56 | static int child_unregister(struct device *dev, void *data) | |
| 57 | { | |
| 58 | nd_device_unregister(dev, ND_SYNC); | |
| 59 | return 0; | |
| 60 | } | |
| 61 | ||
| 62 | static int nd_region_remove(struct device *dev) | |
| 63 | { | |
| 64 | /* flush attribute readers and disable */ | |
| 65 | nvdimm_bus_lock(dev); | |
| 66 | dev_set_drvdata(dev, NULL); | |
| 67 | nvdimm_bus_unlock(dev); | |
| 68 | ||
| 69 | device_for_each_child(dev, NULL, child_unregister); | |
| 70 | return 0; | |
| 71 | } | |
| 72 | ||
| 73 | static struct nd_device_driver nd_region_driver = { | |
| 74 | .probe = nd_region_probe, | |
| 75 | .remove = nd_region_remove, | |
| 76 | .drv = { | |
| 77 | .name = "nd_region", | |
| 78 | }, | |
| 79 | .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM, | |
| 80 | }; | |
| 81 | ||
| 82 | int __init nd_region_init(void) | |
| 83 | { | |
| 84 | return nd_driver_register(&nd_region_driver); | |
| 85 | } | |
| 86 | ||
| 87 | void nd_region_exit(void) | |
| 88 | { | |
| 89 | driver_unregister(&nd_region_driver.drv); | |
| 90 | } | |
| 91 | ||
| 92 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM); | |
| 93 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK); |