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 struct nd_dax *to_nd_dax(struct device *dev) 27 { 28 struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev); 29 30 WARN_ON(!is_nd_dax(dev)); 31 return nd_dax; 32 } 33 EXPORT_SYMBOL(to_nd_dax); 34 35 static const struct device_type nd_dax_device_type = { 36 .name = "nd_dax", 37 .release = nd_dax_release, 38 .groups = nd_pfn_attribute_groups, 39 }; 40 41 bool is_nd_dax(struct device *dev) 42 { 43 return dev ? dev->type == &nd_dax_device_type : false; 44 } 45 EXPORT_SYMBOL(is_nd_dax); 46 47 static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region) 48 { 49 struct nd_pfn *nd_pfn; 50 struct nd_dax *nd_dax; 51 struct device *dev; 52 53 nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL); 54 if (!nd_dax) 55 return NULL; 56 57 nd_pfn = &nd_dax->nd_pfn; 58 nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL); 59 if (nd_pfn->id < 0) { 60 kfree(nd_dax); 61 return NULL; 62 } 63 64 dev = &nd_pfn->dev; 65 dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id); 66 dev->type = &nd_dax_device_type; 67 dev->parent = &nd_region->dev; 68 69 return nd_dax; 70 } 71 72 struct device *nd_dax_create(struct nd_region *nd_region) 73 { 74 struct device *dev = NULL; 75 struct nd_dax *nd_dax; 76 77 if (!is_memory(&nd_region->dev)) 78 return NULL; 79 80 nd_dax = nd_dax_alloc(nd_region); 81 if (nd_dax) 82 dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL); 83 __nd_device_register(dev); 84 return dev; 85 } 86 87 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns) 88 { 89 int rc; 90 struct nd_dax *nd_dax; 91 struct device *dax_dev; 92 struct nd_pfn *nd_pfn; 93 struct nd_pfn_sb *pfn_sb; 94 struct nd_region *nd_region = to_nd_region(ndns->dev.parent); 95 96 if (ndns->force_raw) 97 return -ENODEV; 98 99 switch (ndns->claim_class) { 100 case NVDIMM_CCLASS_NONE: 101 case NVDIMM_CCLASS_DAX: 102 break; 103 default: 104 return -ENODEV; 105 } 106 107 nvdimm_bus_lock(&ndns->dev); 108 nd_dax = nd_dax_alloc(nd_region); 109 nd_pfn = &nd_dax->nd_pfn; 110 dax_dev = nd_pfn_devinit(nd_pfn, ndns); 111 nvdimm_bus_unlock(&ndns->dev); 112 if (!dax_dev) 113 return -ENOMEM; 114 pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL); 115 nd_pfn->pfn_sb = pfn_sb; 116 rc = nd_pfn_validate(nd_pfn, DAX_SIG); 117 dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>"); 118 if (rc < 0) { 119 nd_detach_ndns(dax_dev, &nd_pfn->ndns); 120 put_device(dax_dev); 121 } else 122 __nd_device_register(dax_dev); 123 124 return rc; 125 } 126 EXPORT_SYMBOL(nd_dax_probe); 127