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 == -EACCES)
  53                 nvdimm_set_locked(dev);
  54         if (rc)
  55                 goto err;
  56
  57         rc = nvdimm_init_config_data(ndd);
  58         if (rc == -EACCES)
  59                 nvdimm_set_locked(dev);
  60         if (rc)
  61                 goto err;
  62
  63         dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
  64
  65         nvdimm_bus_lock(dev);
  66         ndd->ns_current = nd_label_validate(ndd);
  67         ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
  68         nd_label_copy(ndd, to_next_namespace_index(ndd),
  69                         to_current_namespace_index(ndd));
  70         if (ndd->ns_current >= 0) {
  71                 rc = nd_label_reserve_dpa(ndd);
  72                 if (rc == 0)
  73                         nvdimm_set_aliasing(dev);
  74         }
  75         nvdimm_clear_locked(dev);
  76         nvdimm_bus_unlock(dev);
  77
  78         if (rc)
  79                 goto err;
  80
  81         return 0;
  82
  83  err:
  84         put_ndd(ndd);
  85         return rc;
  86 }
  87
  88 static int nvdimm_remove(struct device *dev)
  89 {
  90         struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
  91
  92         if (!ndd)
  93                 return 0;
  94
  95         nvdimm_bus_lock(dev);
  96         dev_set_drvdata(dev, NULL);
  97         nvdimm_bus_unlock(dev);
  98         put_ndd(ndd);
  99
 100         return 0;
 101 }
 102
 103 static struct nd_device_driver nvdimm_driver = {
 104         .probe = nvdimm_probe,
 105         .remove = nvdimm_remove,
 106         .drv = {
 107                 .name = "nvdimm",
 108         },
 109         .type = ND_DRIVER_DIMM,
 110 };
 111
 112 int __init nvdimm_init(void)
 113 {
 114         return nd_driver_register(&nvdimm_driver);
 115 }
 116
 117 void nvdimm_exit(void)
 118 {
 119         driver_unregister(&nvdimm_driver.drv);
 120 }
 121
 122 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);