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 /* 38 * The locked status bit reflects explicit status codes from the 39 * label reading commands, revalidate it each time the driver is 40 * activated and re-reads the label area. 41 */ 42 nvdimm_clear_locked(dev); 43 44 ndd = kzalloc(sizeof(*ndd), GFP_KERNEL); 45 if (!ndd) 46 return -ENOMEM; 47 48 dev_set_drvdata(dev, ndd); 49 ndd->dpa.name = dev_name(dev); 50 ndd->ns_current = -1; 51 ndd->ns_next = -1; 52 ndd->dpa.start = 0; 53 ndd->dpa.end = -1; 54 ndd->dev = dev; 55 get_device(dev); 56 kref_init(&ndd->kref); 57 58 /* 59 * Attempt to unlock, if the DIMM supports security commands, 60 * otherwise the locked indication is determined by explicit 61 * status codes from the label reading commands. 62 */ 63 rc = nvdimm_security_unlock(dev); 64 if (rc < 0) 65 dev_dbg(dev, "failed to unlock dimm: %d\n", rc); 66 67 68 /* 69 * EACCES failures reading the namespace label-area-properties 70 * are interpreted as the DIMM capacity being locked but the 71 * namespace labels themselves being accessible. 72 */ 73 rc = nvdimm_init_nsarea(ndd); 74 if (rc == -EACCES) { 75 /* 76 * See nvdimm_namespace_common_probe() where we fail to 77 * allow namespaces to probe while the DIMM is locked, 78 * but we do allow for namespace enumeration. 79 */ 80 nvdimm_set_locked(dev); 81 rc = 0; 82 } 83 if (rc) 84 goto err; 85 86 /* 87 * EACCES failures reading the namespace label-data are 88 * interpreted as the label area being locked in addition to the 89 * DIMM capacity. We fail the dimm probe to prevent regions from 90 * attempting to parse the label area. 91 */ 92 rc = nd_label_data_init(ndd); 93 if (rc == -EACCES) 94 nvdimm_set_locked(dev); 95 if (rc) 96 goto err; 97 98 dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size); 99 100 nvdimm_bus_lock(dev); 101 if (ndd->ns_current >= 0) { 102 rc = nd_label_reserve_dpa(ndd); 103 if (rc == 0) 104 nvdimm_set_aliasing(dev); 105 } 106 nvdimm_bus_unlock(dev); 107 108 if (rc) 109 goto err; 110 111 return 0; 112 113 err: 114 put_ndd(ndd); 115 return rc; 116 } 117 118 static int nvdimm_remove(struct device *dev) 119 { 120 struct nvdimm_drvdata *ndd = dev_get_drvdata(dev); 121 122 if (!ndd) 123 return 0; 124 125 nvdimm_bus_lock(dev); 126 dev_set_drvdata(dev, NULL); 127 nvdimm_bus_unlock(dev); 128 put_ndd(ndd); 129 130 return 0; 131 } 132 133 static struct nd_device_driver nvdimm_driver = { 134 .probe = nvdimm_probe, 135 .remove = nvdimm_remove, 136 .drv = { 137 .name = "nvdimm", 138 }, 139 .type = ND_DRIVER_DIMM, 140 }; 141 142 int __init nvdimm_init(void) 143 { 144 return nd_driver_register(&nvdimm_driver); 145 } 146 147 void nvdimm_exit(void) 148 { 149 driver_unregister(&nvdimm_driver.drv); 150 } 151 152 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM); 153