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 resource ndr_res; 39 40 if (devm_init_badblocks(dev, &nd_region->bb)) 41 return -ENODEV; 42 nd_region->bb_state = sysfs_get_dirent(nd_region->dev.kobj.sd, 43 "badblocks"); 44 if (!nd_region->bb_state) 45 dev_warn(&nd_region->dev, 46 "'badblocks' notification disabled\n"); 47 ndr_res.start = nd_region->ndr_start; 48 ndr_res.end = nd_region->ndr_start + nd_region->ndr_size - 1; 49 nvdimm_badblocks_populate(nd_region, &nd_region->bb, &ndr_res); 50 } 51 52 rc = nd_region_register_namespaces(nd_region, &err); 53 if (rc < 0) 54 return rc; 55 56 ndrd = dev_get_drvdata(dev); 57 ndrd->ns_active = rc; 58 ndrd->ns_count = rc + err; 59 60 if (rc && err && rc == err) 61 return -ENODEV; 62 63 nd_region->btt_seed = nd_btt_create(nd_region); 64 nd_region->pfn_seed = nd_pfn_create(nd_region); 65 nd_region->dax_seed = nd_dax_create(nd_region); 66 if (err == 0) 67 return 0; 68 69 /* 70 * Given multiple namespaces per region, we do not want to 71 * disable all the successfully registered peer namespaces upon 72 * a single registration failure. If userspace is missing a 73 * namespace that it expects it can disable/re-enable the region 74 * to retry discovery after correcting the failure. 75 * <regionX>/namespaces returns the current 76 * "<async-registered>/<total>" namespace count. 77 */ 78 dev_err(dev, "failed to register %d namespace%s, continuing...\n", 79 err, err == 1 ? "" : "s"); 80 return 0; 81 } 82 83 static int child_unregister(struct device *dev, void *data) 84 { 85 nd_device_unregister(dev, ND_SYNC); 86 return 0; 87 } 88 89 static int nd_region_remove(struct device *dev) 90 { 91 struct nd_region *nd_region = to_nd_region(dev); 92 93 device_for_each_child(dev, NULL, child_unregister); 94 95 /* flush attribute readers and disable */ 96 nvdimm_bus_lock(dev); 97 nd_region->ns_seed = NULL; 98 nd_region->btt_seed = NULL; 99 nd_region->pfn_seed = NULL; 100 nd_region->dax_seed = NULL; 101 dev_set_drvdata(dev, NULL); 102 nvdimm_bus_unlock(dev); 103 104 /* 105 * Note, this assumes nd_device_lock() context to not race 106 * nd_region_notify() 107 */ 108 sysfs_put(nd_region->bb_state); 109 nd_region->bb_state = NULL; 110 111 return 0; 112 } 113 114 static int child_notify(struct device *dev, void *data) 115 { 116 nd_device_notify(dev, *(enum nvdimm_event *) data); 117 return 0; 118 } 119 120 static void nd_region_notify(struct device *dev, enum nvdimm_event event) 121 { 122 if (event == NVDIMM_REVALIDATE_POISON) { 123 struct nd_region *nd_region = to_nd_region(dev); 124 struct resource res; 125 126 if (is_memory(&nd_region->dev)) { 127 res.start = nd_region->ndr_start; 128 res.end = nd_region->ndr_start + 129 nd_region->ndr_size - 1; 130 nvdimm_badblocks_populate(nd_region, 131 &nd_region->bb, &res); 132 if (nd_region->bb_state) 133 sysfs_notify_dirent(nd_region->bb_state); 134 } 135 } 136 device_for_each_child(dev, &event, child_notify); 137 } 138 139 static struct nd_device_driver nd_region_driver = { 140 .probe = nd_region_probe, 141 .remove = nd_region_remove, 142 .notify = nd_region_notify, 143 .drv = { 144 .name = "nd_region", 145 }, 146 .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM, 147 }; 148 149 int __init nd_region_init(void) 150 { 151 return nd_driver_register(&nd_region_driver); 152 } 153 154 void nd_region_exit(void) 155 { 156 driver_unregister(&nd_region_driver.drv); 157 } 158 159 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM); 160 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK); 161