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         ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
  38         if (!ndd)
  39                 return -ENOMEM;
  40
  41         dev_set_drvdata(dev, ndd);
  42         ndd->dpa.name = dev_name(dev);
  43         ndd->ns_current = -1;
  44         ndd->ns_next = -1;
  45         ndd->dpa.start = 0;
  46         ndd->dpa.end = -1;
  47         ndd->dev = dev;
  48         get_device(dev);
  49         kref_init(&ndd->kref);
  50
  51         rc = nvdimm_init_nsarea(ndd);
  52         if (rc)
  53                 goto err;
  54
  55         rc = nvdimm_init_config_data(ndd);
  56         if (rc)
  57                 goto err;
  58
  59         dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
  60
  61         nvdimm_bus_lock(dev);
  62         ndd->ns_current = nd_label_validate(ndd);
  63         ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
  64         nd_label_copy(ndd, to_next_namespace_index(ndd),
  65                         to_current_namespace_index(ndd));
  66         rc = nd_label_reserve_dpa(ndd);
  67         if (ndd->ns_current >= 0)
  68                 nvdimm_set_aliasing(dev);
  69         nvdimm_bus_unlock(dev);
  70
  71         if (rc)
  72                 goto err;
  73
  74         return 0;
  75
  76  err:
  77         put_ndd(ndd);
  78         return rc;
  79 }
  80
  81 static int nvdimm_remove(struct device *dev)
  82 {
  83         struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
  84
  85         if (!ndd)
  86                 return 0;
  87
  88         nvdimm_bus_lock(dev);
  89         dev_set_drvdata(dev, NULL);
  90         nvdimm_bus_unlock(dev);
  91         put_ndd(ndd);
  92
  93         return 0;
  94 }
  95
  96 static struct nd_device_driver nvdimm_driver = {
  97         .probe = nvdimm_probe,
  98         .remove = nvdimm_remove,
  99         .drv = {
 100                 .name = "nvdimm",
 101         },
 102         .type = ND_DRIVER_DIMM,
 103 };
 104
 105 int __init nvdimm_init(void)
 106 {
 107         return nd_driver_register(&nvdimm_driver);
 108 }
 109
 110 void nvdimm_exit(void)
 111 {
 112         driver_unregister(&nvdimm_driver.drv);
 113 }
 114
 115 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);