drivers/nvdimm/dax_devs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
   4  */
   5 #include <linux/device.h>
   6 #include <linux/sizes.h>
   7 #include <linux/slab.h>
   8 #include <linux/mm.h>
   9 #include "nd-core.h"
  10 #include "pfn.h"
  11 #include "nd.h"
  12
  13 static void nd_dax_release(struct device *dev)
  14 {
  15         struct nd_region *nd_region = to_nd_region(dev->parent);
  16         struct nd_dax *nd_dax = to_nd_dax(dev);
  17         struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
  18
  19         dev_dbg(dev, "trace\n");
  20         nd_detach_ndns(dev, &nd_pfn->ndns);
  21         ida_simple_remove(&nd_region->dax_ida, nd_pfn->id);
  22         kfree(nd_pfn->uuid);
  23         kfree(nd_dax);
  24 }
  25
  26 static struct device_type nd_dax_device_type = {
  27         .name = "nd_dax",
  28         .release = nd_dax_release,
  29 };
  30
  31 bool is_nd_dax(struct device *dev)
  32 {
  33         return dev ? dev->type == &nd_dax_device_type : false;
  34 }
  35 EXPORT_SYMBOL(is_nd_dax);
  36
  37 struct nd_dax *to_nd_dax(struct device *dev)
  38 {
  39         struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev);
  40
  41         WARN_ON(!is_nd_dax(dev));
  42         return nd_dax;
  43 }
  44 EXPORT_SYMBOL(to_nd_dax);
  45
  46 static const struct attribute_group *nd_dax_attribute_groups[] = {
  47         &nd_pfn_attribute_group,
  48         &nd_device_attribute_group,
  49         &nd_numa_attribute_group,
  50         NULL,
  51 };
  52
  53 static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region)
  54 {
  55         struct nd_pfn *nd_pfn;
  56         struct nd_dax *nd_dax;
  57         struct device *dev;
  58
  59         nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL);
  60         if (!nd_dax)
  61                 return NULL;
  62
  63         nd_pfn = &nd_dax->nd_pfn;
  64         nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL);
  65         if (nd_pfn->id < 0) {
  66                 kfree(nd_dax);
  67                 return NULL;
  68         }
  69
  70         dev = &nd_pfn->dev;
  71         dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id);
  72         dev->groups = nd_dax_attribute_groups;
  73         dev->type = &nd_dax_device_type;
  74         dev->parent = &nd_region->dev;
  75
  76         return nd_dax;
  77 }
  78
  79 struct device *nd_dax_create(struct nd_region *nd_region)
  80 {
  81         struct device *dev = NULL;
  82         struct nd_dax *nd_dax;
  83
  84         if (!is_memory(&nd_region->dev))
  85                 return NULL;
  86
  87         nd_dax = nd_dax_alloc(nd_region);
  88         if (nd_dax)
  89                 dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL);
  90         __nd_device_register(dev);
  91         return dev;
  92 }
  93
  94 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
  95 {
  96         int rc;
  97         struct nd_dax *nd_dax;
  98         struct device *dax_dev;
  99         struct nd_pfn *nd_pfn;
 100         struct nd_pfn_sb *pfn_sb;
 101         struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
 102
 103         if (ndns->force_raw)
 104                 return -ENODEV;
 105
 106         switch (ndns->claim_class) {
 107         case NVDIMM_CCLASS_NONE:
 108         case NVDIMM_CCLASS_DAX:
 109                 break;
 110         default:
 111                 return -ENODEV;
 112         }
 113
 114         nvdimm_bus_lock(&ndns->dev);
 115         nd_dax = nd_dax_alloc(nd_region);
 116         nd_pfn = &nd_dax->nd_pfn;
 117         dax_dev = nd_pfn_devinit(nd_pfn, ndns);
 118         nvdimm_bus_unlock(&ndns->dev);
 119         if (!dax_dev)
 120                 return -ENOMEM;
 121         pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
 122         nd_pfn->pfn_sb = pfn_sb;
 123         rc = nd_pfn_validate(nd_pfn, DAX_SIG);
 124         dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>");
 125         if (rc < 0) {
 126                 nd_detach_ndns(dax_dev, &nd_pfn->ndns);
 127                 put_device(dax_dev);
 128         } else
 129                 __nd_device_register(dax_dev);
 130
 131         return rc;
 132 }
 133 EXPORT_SYMBOL(nd_dax_probe);