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_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);