drivers/nvdimm/dimm.c

   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_security_setup_events(dev);
  30         if (rc < 0) {
  31                 dev_err(dev, "security event setup failed: %d\n", rc);
  32                 return rc;
  33         }
  34
  35         rc = nvdimm_check_config_data(dev);
  36         if (rc) {
  37                 /* not required for non-aliased nvdimm, ex. NVDIMM-N */
  38                 if (rc == -ENOTTY)
  39                         rc = 0;
  40                 return rc;
  41         }
  42
  43         /*
  44          * The locked status bit reflects explicit status codes from the
  45          * label reading commands, revalidate it each time the driver is
  46          * activated and re-reads the label area.
  47          */
  48         nvdimm_clear_locked(dev);
  49
  50         ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
  51         if (!ndd)
  52                 return -ENOMEM;
  53
  54         dev_set_drvdata(dev, ndd);
  55         ndd->dpa.name = dev_name(dev);
  56         ndd->ns_current = -1;
  57         ndd->ns_next = -1;
  58         ndd->dpa.start = 0;
  59         ndd->dpa.end = -1;
  60         ndd->dev = dev;
  61         get_device(dev);
  62         kref_init(&ndd->kref);
  63
  64         /*
  65          * Attempt to unlock, if the DIMM supports security commands,
  66          * otherwise the locked indication is determined by explicit
  67          * status codes from the label reading commands.
  68          */
  69         rc = nvdimm_security_unlock(dev);
  70         if (rc < 0)
  71                 dev_dbg(dev, "failed to unlock dimm: %d\n", rc);
  72
  73
  74         /*
  75          * EACCES failures reading the namespace label-area-properties
  76          * are interpreted as the DIMM capacity being locked but the
  77          * namespace labels themselves being accessible.
  78          */
  79         rc = nvdimm_init_nsarea(ndd);
  80         if (rc == -EACCES) {
  81                 /*
  82                  * See nvdimm_namespace_common_probe() where we fail to
  83                  * allow namespaces to probe while the DIMM is locked,
  84                  * but we do allow for namespace enumeration.
  85                  */
  86                 nvdimm_set_locked(dev);
  87                 rc = 0;
  88         }
  89         if (rc)
  90                 goto err;
  91
  92         /*
  93          * EACCES failures reading the namespace label-data are
  94          * interpreted as the label area being locked in addition to the
  95          * DIMM capacity. We fail the dimm probe to prevent regions from
  96          * attempting to parse the label area.
  97          */
  98         rc = nd_label_data_init(ndd);
  99         if (rc == -EACCES)
 100                 nvdimm_set_locked(dev);
 101         if (rc)
 102                 goto err;
 103
 104         dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
 105
 106         nvdimm_bus_lock(dev);
 107         if (ndd->ns_current >= 0) {
 108                 rc = nd_label_reserve_dpa(ndd);
 109                 if (rc == 0)
 110                         nvdimm_set_aliasing(dev);
 111         }
 112         nvdimm_bus_unlock(dev);
 113
 114         if (rc)
 115                 goto err;
 116
 117         return 0;
 118
 119  err:
 120         put_ndd(ndd);
 121         return rc;
 122 }
 123
 124 static int nvdimm_remove(struct device *dev)
 125 {
 126         struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
 127
 128         if (!ndd)
 129                 return 0;
 130
 131         nvdimm_bus_lock(dev);
 132         dev_set_drvdata(dev, NULL);
 133         nvdimm_bus_unlock(dev);
 134         put_ndd(ndd);
 135
 136         return 0;
 137 }
 138
 139 static struct nd_device_driver nvdimm_driver = {
 140         .probe = nvdimm_probe,
 141         .remove = nvdimm_remove,
 142         .drv = {
 143                 .name = "nvdimm",
 144         },
 145         .type = ND_DRIVER_DIMM,
 146 };
 147
 148 int __init nvdimm_init(void)
 149 {
 150         return nd_driver_register(&nvdimm_driver);
 151 }
 152
 153 void nvdimm_exit(void)
 154 {
 155         driver_unregister(&nvdimm_driver.drv);
 156 }
 157
 158 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);