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 void free_data(struct nvdimm_drvdata *ndd)
  25 {
  26         if (!ndd)
  27                 return;
  28
  29         if (ndd->data && is_vmalloc_addr(ndd->data))
  30                 vfree(ndd->data);
  31         else
  32                 kfree(ndd->data);
  33         kfree(ndd);
  34 }
  35
  36 static int nvdimm_probe(struct device *dev)
  37 {
  38         struct nvdimm_drvdata *ndd;
  39         int rc;
  40
  41         ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
  42         if (!ndd)
  43                 return -ENOMEM;
  44
  45         dev_set_drvdata(dev, ndd);
  46         ndd->dpa.name = dev_name(dev);
  47         ndd->ns_current = -1;
  48         ndd->ns_next = -1;
  49         ndd->dpa.start = 0;
  50         ndd->dpa.end = -1;
  51         ndd->dev = dev;
  52
  53         rc = nvdimm_init_nsarea(ndd);
  54         if (rc)
  55                 goto err;
  56
  57         rc = nvdimm_init_config_data(ndd);
  58         if (rc)
  59                 goto err;
  60
  61         dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
  62
  63         nvdimm_bus_lock(dev);
  64         ndd->ns_current = nd_label_validate(ndd);
  65         ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
  66         nd_label_copy(ndd, to_next_namespace_index(ndd),
  67                         to_current_namespace_index(ndd));
  68         rc = nd_label_reserve_dpa(ndd);
  69         nvdimm_bus_unlock(dev);
  70
  71         if (rc)
  72                 goto err;
  73
  74         return 0;
  75
  76  err:
  77         free_data(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         struct resource *res, *_r;
  85
  86         nvdimm_bus_lock(dev);
  87         dev_set_drvdata(dev, NULL);
  88         for_each_dpa_resource_safe(ndd, res, _r)
  89                 nvdimm_free_dpa(ndd, res);
  90         nvdimm_bus_unlock(dev);
  91         free_data(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);