drivers/nvdimm/dimm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   4  */
   5 #include <linux/vmalloc.h>
   6 #include <linux/module.h>
   7 #include <linux/device.h>
   8 #include <linux/sizes.h>
   9 #include <linux/ndctl.h>
  10 #include <linux/slab.h>
  11 #include <linux/mm.h>
  12 #include <linux/nd.h>
  13 #include "label.h"
  14 #include "nd.h"
  15
  16 static int nvdimm_probe(struct device *dev)
  17 {
  18         struct nvdimm_drvdata *ndd;
  19         int rc;
  20
  21         rc = nvdimm_security_setup_events(dev);
  22         if (rc < 0) {
  23                 dev_err(dev, "security event setup failed: %d\n", rc);
  24                 return rc;
  25         }
  26
  27         rc = nvdimm_check_config_data(dev);
  28         if (rc) {
  29                 /* not required for non-aliased nvdimm, ex. NVDIMM-N */
  30                 if (rc == -ENOTTY)
  31                         rc = 0;
  32                 return rc;
  33         }
  34
  35         /*
  36          * The locked status bit reflects explicit status codes from the
  37          * label reading commands, revalidate it each time the driver is
  38          * activated and re-reads the label area.
  39          */
  40         nvdimm_clear_locked(dev);
  41
  42         ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
  43         if (!ndd)
  44                 return -ENOMEM;
  45
  46         dev_set_drvdata(dev, ndd);
  47         ndd->dpa.name = dev_name(dev);
  48         ndd->ns_current = -1;
  49         ndd->ns_next = -1;
  50         ndd->dpa.start = 0;
  51         ndd->dpa.end = -1;
  52         ndd->dev = dev;
  53         get_device(dev);
  54         kref_init(&ndd->kref);
  55
  56         /*
  57          * Attempt to unlock, if the DIMM supports security commands,
  58          * otherwise the locked indication is determined by explicit
  59          * status codes from the label reading commands.
  60          */
  61         rc = nvdimm_security_unlock(dev);
  62         if (rc < 0)
  63                 dev_dbg(dev, "failed to unlock dimm: %d\n", rc);
  64
  65
  66         /*
  67          * EACCES failures reading the namespace label-area-properties
  68          * are interpreted as the DIMM capacity being locked but the
  69          * namespace labels themselves being accessible.
  70          */
  71         rc = nvdimm_init_nsarea(ndd);
  72         if (rc == -EACCES) {
  73                 /*
  74                  * See nvdimm_namespace_common_probe() where we fail to
  75                  * allow namespaces to probe while the DIMM is locked,
  76                  * but we do allow for namespace enumeration.
  77                  */
  78                 nvdimm_set_locked(dev);
  79                 rc = 0;
  80         }
  81         if (rc)
  82                 goto err;
  83
  84         /*
  85          * EACCES failures reading the namespace label-data are
  86          * interpreted as the label area being locked in addition to the
  87          * DIMM capacity. We fail the dimm probe to prevent regions from
  88          * attempting to parse the label area.
  89          */
  90         rc = nd_label_data_init(ndd);
  91         if (rc == -EACCES)
  92                 nvdimm_set_locked(dev);
  93         if (rc)
  94                 goto err;
  95
  96         dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
  97
  98         nvdimm_bus_lock(dev);
  99         if (ndd->ns_current >= 0) {
 100                 rc = nd_label_reserve_dpa(ndd);
 101                 if (rc == 0)
 102                         nvdimm_set_aliasing(dev);
 103         }
 104         nvdimm_bus_unlock(dev);
 105
 106         if (rc)
 107                 goto err;
 108
 109         return 0;
 110
 111  err:
 112         put_ndd(ndd);
 113         return rc;
 114 }
 115
 116 static int nvdimm_remove(struct device *dev)
 117 {
 118         struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
 119
 120         if (!ndd)
 121                 return 0;
 122
 123         nvdimm_bus_lock(dev);
 124         dev_set_drvdata(dev, NULL);
 125         nvdimm_bus_unlock(dev);
 126         put_ndd(ndd);
 127
 128         return 0;
 129 }
 130
 131 static struct nd_device_driver nvdimm_driver = {
 132         .probe = nvdimm_probe,
 133         .remove = nvdimm_remove,
 134         .drv = {
 135                 .name = "nvdimm",
 136         },
 137         .type = ND_DRIVER_DIMM,
 138 };
 139
 140 int __init nvdimm_init(void)
 141 {
 142         return nd_driver_register(&nvdimm_driver);
 143 }
 144
 145 void nvdimm_exit(void)
 146 {
 147         driver_unregister(&nvdimm_driver.drv);
 148 }
 149
 150 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);