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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright IBM Corp. 2001, 2012 * Author(s): Robert Burroughs * Eric Rossman (edrossma@us.ibm.com) * Cornelia Huck <cornelia.huck@de.ibm.com> * * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> * Ralph Wuerthner <rwuerthn@de.ibm.com> * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com> */ #include <linux/module.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/miscdevice.h> #include <linux/fs.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/compat.h> #include <linux/slab.h> #include <linux/atomic.h> #include <linux/uaccess.h> #include <linux/hw_random.h> #include <linux/debugfs.h> #include <asm/debug.h> #include "zcrypt_debug.h" #include "zcrypt_api.h" #include "zcrypt_msgtype6.h" #include "zcrypt_msgtype50.h" /* * Device attributes common for all crypto card devices. */ static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf) { struct zcrypt_card *zc = dev_get_drvdata(dev); return sysfs_emit(buf, "%s\n", zc->type_string); } static DEVICE_ATTR_RO(type); static ssize_t online_show(struct device *dev, struct device_attribute *attr, char *buf) { struct zcrypt_card *zc = dev_get_drvdata(dev); struct ap_card *ac = to_ap_card(dev); int online = ac->config && !ac->chkstop && zc->online ? 1 : 0; return sysfs_emit(buf, "%d\n", online); } static ssize_t online_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct zcrypt_card *zc = dev_get_drvdata(dev); struct ap_card *ac = to_ap_card(dev); struct zcrypt_queue *zq; int online, id, i = 0, maxzqs = 0; struct zcrypt_queue **zq_uelist = NULL; if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) return -EINVAL; if (online && (!ac->config || ac->chkstop)) return -ENODEV; zc->online = online; id = zc->card->id; ZCRYPT_DBF_INFO("%s card=%02x online=%d\n", __func__, id, online); ap_send_online_uevent(&ac->ap_dev, online); spin_lock(&zcrypt_list_lock); /* * As we are in atomic context here, directly sending uevents * does not work. So collect the zqueues in a dynamic array * and process them after zcrypt_list_lock release. As we get/put * the zqueue objects, we make sure they exist after lock release. */ list_for_each_entry(zq, &zc->zqueues, list) maxzqs++; if (maxzqs > 0) zq_uelist = kcalloc(maxzqs + 1, sizeof(*zq_uelist), GFP_ATOMIC); list_for_each_entry(zq, &zc->zqueues, list) if (zcrypt_queue_force_online(zq, online)) if (zq_uelist) { zcrypt_queue_get(zq); zq_uelist[i++] = zq; } spin_unlock(&zcrypt_list_lock); if (zq_uelist) { for (i = 0; zq_uelist[i]; i++) { zq = zq_uelist[i]; ap_send_online_uevent(&zq->queue->ap_dev, online); zcrypt_queue_put(zq); } kfree(zq_uelist); } return count; } static DEVICE_ATTR_RW(online); static ssize_t load_show(struct device *dev, struct device_attribute *attr, char *buf) { struct zcrypt_card *zc = dev_get_drvdata(dev); return sysfs_emit(buf, "%d\n", atomic_read(&zc->load)); } static DEVICE_ATTR_RO(load); static struct attribute *zcrypt_card_attrs[] = { &dev_attr_type.attr, &dev_attr_online.attr, &dev_attr_load.attr, NULL, }; static const struct attribute_group zcrypt_card_attr_group = { .attrs = zcrypt_card_attrs, }; struct zcrypt_card *zcrypt_card_alloc(void) { struct zcrypt_card *zc; zc = kzalloc(sizeof(*zc), GFP_KERNEL); if (!zc) return NULL; INIT_LIST_HEAD(&zc->list); INIT_LIST_HEAD(&zc->zqueues); kref_init(&zc->refcount); return zc; } EXPORT_SYMBOL(zcrypt_card_alloc); void zcrypt_card_free(struct zcrypt_card *zc) { kfree(zc); } EXPORT_SYMBOL(zcrypt_card_free); static void zcrypt_card_release(struct kref *kref) { struct zcrypt_card *zdev = container_of(kref, struct zcrypt_card, refcount); zcrypt_card_free(zdev); } void zcrypt_card_get(struct zcrypt_card *zc) { kref_get(&zc->refcount); } EXPORT_SYMBOL(zcrypt_card_get); int zcrypt_card_put(struct zcrypt_card *zc) { return kref_put(&zc->refcount, zcrypt_card_release); } EXPORT_SYMBOL(zcrypt_card_put); /** * zcrypt_card_register() - Register a crypto card device. * @zc: Pointer to a crypto card device * * Register a crypto card device. Returns 0 if successful. */ int zcrypt_card_register(struct zcrypt_card *zc) { int rc; spin_lock(&zcrypt_list_lock); list_add_tail(&zc->list, &zcrypt_card_list); spin_unlock(&zcrypt_list_lock); zc->online = 1; ZCRYPT_DBF_INFO("%s card=%02x register online=1\n", __func__, zc->card->id); rc = sysfs_create_group(&zc->card->ap_dev.device.kobj, &zcrypt_card_attr_group); if (rc) { spin_lock(&zcrypt_list_lock); list_del_init(&zc->list); spin_unlock(&zcrypt_list_lock); } return rc; } EXPORT_SYMBOL(zcrypt_card_register); /** * zcrypt_card_unregister(): Unregister a crypto card device. * @zc: Pointer to crypto card device * * Unregister a crypto card device. */ void zcrypt_card_unregister(struct zcrypt_card *zc) { ZCRYPT_DBF_INFO("%s card=%02x unregister\n", __func__, zc->card->id); spin_lock(&zcrypt_list_lock); list_del_init(&zc->list); spin_unlock(&zcrypt_list_lock); sysfs_remove_group(&zc->card->ap_dev.device.kobj, &zcrypt_card_attr_group); zcrypt_card_put(zc); } EXPORT_SYMBOL(zcrypt_card_unregister); |