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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | /* * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/device.h> #include <linux/sizes.h> #include <linux/slab.h> #include <linux/mm.h> #include "nd-core.h" #include "pfn.h" #include "nd.h" static void nd_dax_release(struct device *dev) { struct nd_region *nd_region = to_nd_region(dev->parent); struct nd_dax *nd_dax = to_nd_dax(dev); struct nd_pfn *nd_pfn = &nd_dax->nd_pfn; dev_dbg(dev, "%s\n", __func__); nd_detach_ndns(dev, &nd_pfn->ndns); ida_simple_remove(&nd_region->dax_ida, nd_pfn->id); kfree(nd_pfn->uuid); kfree(nd_dax); } static struct device_type nd_dax_device_type = { .name = "nd_dax", .release = nd_dax_release, }; bool is_nd_dax(struct device *dev) { return dev ? dev->type == &nd_dax_device_type : false; } EXPORT_SYMBOL(is_nd_dax); struct nd_dax *to_nd_dax(struct device *dev) { struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev); WARN_ON(!is_nd_dax(dev)); return nd_dax; } EXPORT_SYMBOL(to_nd_dax); static const struct attribute_group *nd_dax_attribute_groups[] = { &nd_pfn_attribute_group, &nd_device_attribute_group, &nd_numa_attribute_group, NULL, }; static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region) { struct nd_pfn *nd_pfn; struct nd_dax *nd_dax; struct device *dev; nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL); if (!nd_dax) return NULL; nd_pfn = &nd_dax->nd_pfn; nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL); if (nd_pfn->id < 0) { kfree(nd_dax); return NULL; } dev = &nd_pfn->dev; dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id); dev->groups = nd_dax_attribute_groups; dev->type = &nd_dax_device_type; dev->parent = &nd_region->dev; return nd_dax; } struct device *nd_dax_create(struct nd_region *nd_region) { struct device *dev = NULL; struct nd_dax *nd_dax; if (!is_nd_pmem(&nd_region->dev)) return NULL; nd_dax = nd_dax_alloc(nd_region); if (nd_dax) dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL); __nd_device_register(dev); return dev; } int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns) { int rc; struct nd_dax *nd_dax; struct device *dax_dev; struct nd_pfn *nd_pfn; struct nd_pfn_sb *pfn_sb; struct nd_region *nd_region = to_nd_region(ndns->dev.parent); if (ndns->force_raw) return -ENODEV; nvdimm_bus_lock(&ndns->dev); nd_dax = nd_dax_alloc(nd_region); nd_pfn = &nd_dax->nd_pfn; dax_dev = nd_pfn_devinit(nd_pfn, ndns); nvdimm_bus_unlock(&ndns->dev); if (!dax_dev) return -ENOMEM; pfn_sb = devm_kzalloc(dev, sizeof(*pfn_sb), GFP_KERNEL); nd_pfn->pfn_sb = pfn_sb; rc = nd_pfn_validate(nd_pfn, DAX_SIG); dev_dbg(dev, "%s: dax: %s\n", __func__, rc == 0 ? dev_name(dax_dev) : "<none>"); if (rc < 0) { __nd_detach_ndns(dax_dev, &nd_pfn->ndns); put_device(dax_dev); } else __nd_device_register(dax_dev); return rc; } EXPORT_SYMBOL(nd_dax_probe); |