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/vmalloc.h> 14 #include <linux/module.h> 15 #include <linux/device.h> 16 #include <linux/sizes.h> 17 #include <linux/ndctl.h> 18 #include <linux/slab.h> 19 #include <linux/mm.h> 20 #include <linux/nd.h> 21 #include "label.h" 22 #include "nd.h" 23 24 static int nvdimm_probe(struct device *dev) 25 { 26 struct nvdimm_drvdata *ndd; 27 int rc; 28 29 rc = nvdimm_check_config_data(dev); 30 if (rc) { 31 /* not required for non-aliased nvdimm, ex. NVDIMM-N */ 32 if (rc == -ENOTTY) 33 rc = 0; 34 return rc; 35 } 36 37 /* reset locked, to be validated below... */ 38 nvdimm_clear_locked(dev); 39 40 ndd = kzalloc(sizeof(*ndd), GFP_KERNEL); 41 if (!ndd) 42 return -ENOMEM; 43 44 dev_set_drvdata(dev, ndd); 45 ndd->dpa.name = dev_name(dev); 46 ndd->ns_current = -1; 47 ndd->ns_next = -1; 48 ndd->dpa.start = 0; 49 ndd->dpa.end = -1; 50 ndd->dev = dev; 51 get_device(dev); 52 kref_init(&ndd->kref); 53 54 /* 55 * EACCES failures reading the namespace label-area-properties 56 * are interpreted as the DIMM capacity being locked but the 57 * namespace labels themselves being accessible. 58 */ 59 rc = nvdimm_init_nsarea(ndd); 60 if (rc == -EACCES) { 61 /* 62 * See nvdimm_namespace_common_probe() where we fail to 63 * allow namespaces to probe while the DIMM is locked, 64 * but we do allow for namespace enumeration. 65 */ 66 nvdimm_set_locked(dev); 67 rc = 0; 68 } 69 if (rc) 70 goto err; 71 72 /* 73 * EACCES failures reading the namespace label-data are 74 * interpreted as the label area being locked in addition to the 75 * DIMM capacity. We fail the dimm probe to prevent regions from 76 * attempting to parse the label area. 77 */ 78 rc = nvdimm_init_config_data(ndd); 79 if (rc == -EACCES) 80 nvdimm_set_locked(dev); 81 if (rc) 82 goto err; 83 84 dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size); 85 86 nvdimm_bus_lock(dev); 87 ndd->ns_current = nd_label_validate(ndd); 88 ndd->ns_next = nd_label_next_nsindex(ndd->ns_current); 89 nd_label_copy(ndd, to_next_namespace_index(ndd), 90 to_current_namespace_index(ndd)); 91 if (ndd->ns_current >= 0) { 92 rc = nd_label_reserve_dpa(ndd); 93 if (rc == 0) 94 nvdimm_set_aliasing(dev); 95 } 96 nvdimm_bus_unlock(dev); 97 98 if (rc) 99 goto err; 100 101 return 0; 102 103 err: 104 put_ndd(ndd); 105 return rc; 106 } 107 108 static int nvdimm_remove(struct device *dev) 109 { 110 struct nvdimm_drvdata *ndd = dev_get_drvdata(dev); 111 112 if (!ndd) 113 return 0; 114 115 nvdimm_bus_lock(dev); 116 dev_set_drvdata(dev, NULL); 117 nvdimm_bus_unlock(dev); 118 put_ndd(ndd); 119 120 return 0; 121 } 122 123 static struct nd_device_driver nvdimm_driver = { 124 .probe = nvdimm_probe, 125 .remove = nvdimm_remove, 126 .drv = { 127 .name = "nvdimm", 128 }, 129 .type = ND_DRIVER_DIMM, 130 }; 131 132 int __init nvdimm_init(void) 133 { 134 return nd_driver_register(&nvdimm_driver); 135 } 136 137 void nvdimm_exit(void) 138 { 139 driver_unregister(&nvdimm_driver.drv); 140 } 141 142 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM); 143