1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. 4 */ 5 #include <linux/cpumask.h> 6 #include <linux/module.h> 7 #include <linux/device.h> 8 #include <linux/nd.h> 9 #include "nd-core.h" 10 #include "nd.h" 11 12 static int nd_region_probe(struct device *dev) 13 { 14 int err, rc; 15 static unsigned long once; 16 struct nd_region_data *ndrd; 17 struct nd_region *nd_region = to_nd_region(dev); 18 19 if (nd_region->num_lanes > num_online_cpus() 20 && nd_region->num_lanes < num_possible_cpus() 21 && !test_and_set_bit(0, &once)) { 22 dev_dbg(dev, "online cpus (%d) < concurrent i/o lanes (%d) < possible cpus (%d)\n", 23 num_online_cpus(), nd_region->num_lanes, 24 num_possible_cpus()); 25 dev_dbg(dev, "setting nr_cpus=%d may yield better libnvdimm device performance\n", 26 nd_region->num_lanes); 27 } 28 29 rc = nd_region_activate(nd_region); 30 if (rc) 31 return rc; 32 33 rc = nd_blk_region_init(nd_region); 34 if (rc) 35 return rc; 36 37 if (is_memory(&nd_region->dev)) { 38 struct range range = { 39 .start = nd_region->ndr_start, 40 .end = nd_region->ndr_start + nd_region->ndr_size - 1, 41 }; 42 43 if (devm_init_badblocks(dev, &nd_region->bb)) 44 return -ENODEV; 45 nd_region->bb_state = sysfs_get_dirent(nd_region->dev.kobj.sd, 46 "badblocks"); 47 if (!nd_region->bb_state) 48 dev_warn(&nd_region->dev, 49 "'badblocks' notification disabled\n"); 50 nvdimm_badblocks_populate(nd_region, &nd_region->bb, &range); 51 } 52 53 rc = nd_region_register_namespaces(nd_region, &err); 54 if (rc < 0) 55 return rc; 56 57 ndrd = dev_get_drvdata(dev); 58 ndrd->ns_active = rc; 59 ndrd->ns_count = rc + err; 60 61 if (rc && err && rc == err) 62 return -ENODEV; 63 64 nd_region->btt_seed = nd_btt_create(nd_region); 65 nd_region->pfn_seed = nd_pfn_create(nd_region); 66 nd_region->dax_seed = nd_dax_create(nd_region); 67 if (err == 0) 68 return 0; 69 70 /* 71 * Given multiple namespaces per region, we do not want to 72 * disable all the successfully registered peer namespaces upon 73 * a single registration failure. If userspace is missing a 74 * namespace that it expects it can disable/re-enable the region 75 * to retry discovery after correcting the failure. 76 * <regionX>/namespaces returns the current 77 * "<async-registered>/<total>" namespace count. 78 */ 79 dev_err(dev, "failed to register %d namespace%s, continuing...\n", 80 err, err == 1 ? "" : "s"); 81 return 0; 82 } 83 84 static int child_unregister(struct device *dev, void *data) 85 { 86 nd_device_unregister(dev, ND_SYNC); 87 return 0; 88 } 89 90 static int nd_region_remove(struct device *dev) 91 { 92 struct nd_region *nd_region = to_nd_region(dev); 93 94 device_for_each_child(dev, NULL, child_unregister); 95 96 /* flush attribute readers and disable */ 97 nvdimm_bus_lock(dev); 98 nd_region->ns_seed = NULL; 99 nd_region->btt_seed = NULL; 100 nd_region->pfn_seed = NULL; 101 nd_region->dax_seed = NULL; 102 dev_set_drvdata(dev, NULL); 103 nvdimm_bus_unlock(dev); 104 105 /* 106 * Note, this assumes nd_device_lock() context to not race 107 * nd_region_notify() 108 */ 109 sysfs_put(nd_region->bb_state); 110 nd_region->bb_state = NULL; 111 112 return 0; 113 } 114 115 static int child_notify(struct device *dev, void *data) 116 { 117 nd_device_notify(dev, *(enum nvdimm_event *) data); 118 return 0; 119 } 120 121 static void nd_region_notify(struct device *dev, enum nvdimm_event event) 122 { 123 if (event == NVDIMM_REVALIDATE_POISON) { 124 struct nd_region *nd_region = to_nd_region(dev); 125 126 if (is_memory(&nd_region->dev)) { 127 struct range range = { 128 .start = nd_region->ndr_start, 129 .end = nd_region->ndr_start + 130 nd_region->ndr_size - 1, 131 }; 132 133 nvdimm_badblocks_populate(nd_region, 134 &nd_region->bb, &range); 135 if (nd_region->bb_state) 136 sysfs_notify_dirent(nd_region->bb_state); 137 } 138 } 139 device_for_each_child(dev, &event, child_notify); 140 } 141 142 static struct nd_device_driver nd_region_driver = { 143 .probe = nd_region_probe, 144 .remove = nd_region_remove, 145 .notify = nd_region_notify, 146 .drv = { 147 .name = "nd_region", 148 }, 149 .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM, 150 }; 151 152 int __init nd_region_init(void) 153 { 154 return nd_driver_register(&nd_region_driver); 155 } 156 157 void nd_region_exit(void) 158 { 159 driver_unregister(&nd_region_driver.drv); 160 } 161 162 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM); 163 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK); 164