1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright IBM Corp. 2001, 2012 4 * Author(s): Robert Burroughs 5 * Eric Rossman (edrossma@us.ibm.com) 6 * Cornelia Huck <cornelia.huck@de.ibm.com> 7 * 8 * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) 9 * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> 10 * Ralph Wuerthner <rwuerthn@de.ibm.com> 11 * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com> 12 */ 13 14 #include <linux/export.h> 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/interrupt.h> 18 #include <linux/miscdevice.h> 19 #include <linux/fs.h> 20 #include <linux/proc_fs.h> 21 #include <linux/seq_file.h> 22 #include <linux/compat.h> 23 #include <linux/slab.h> 24 #include <linux/atomic.h> 25 #include <linux/uaccess.h> 26 #include <linux/hw_random.h> 27 #include <linux/debugfs.h> 28 #include <asm/debug.h> 29 30 #include "zcrypt_debug.h" 31 #include "zcrypt_api.h" 32 33 #include "zcrypt_msgtype6.h" 34 #include "zcrypt_msgtype50.h" 35 36 /* 37 * Device attributes common for all crypto card devices. 38 */ 39 40 static ssize_t type_show(struct device *dev, 41 struct device_attribute *attr, char *buf) 42 { 43 struct zcrypt_card *zc = dev_get_drvdata(dev); 44 45 return sysfs_emit(buf, "%s\n", zc->type_string); 46 } 47 48 static DEVICE_ATTR_RO(type); 49 50 static ssize_t online_show(struct device *dev, 51 struct device_attribute *attr, 52 char *buf) 53 { 54 struct zcrypt_card *zc = dev_get_drvdata(dev); 55 struct ap_card *ac = to_ap_card(dev); 56 int online = ac->config && !ac->chkstop && zc->online ? 1 : 0; 57 58 return sysfs_emit(buf, "%d\n", online); 59 } 60 61 static ssize_t online_store(struct device *dev, 62 struct device_attribute *attr, 63 const char *buf, size_t count) 64 { 65 struct zcrypt_card *zc = dev_get_drvdata(dev); 66 struct ap_card *ac = to_ap_card(dev); 67 struct zcrypt_queue *zq; 68 int online, id, i = 0, maxzqs = 0; 69 struct zcrypt_queue **zq_uelist = NULL; 70 71 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) 72 return -EINVAL; 73 74 if (online && (!ac->config || ac->chkstop)) 75 return -ENODEV; 76 77 zc->online = online; 78 id = zc->card->id; 79 80 ZCRYPT_DBF_INFO("%s card=%02x online=%d\n", __func__, id, online); 81 82 ap_send_online_uevent(&ac->ap_dev, online); 83 84 spin_lock(&zcrypt_list_lock); 85 /* 86 * As we are in atomic context here, directly sending uevents 87 * does not work. So collect the zqueues in a dynamic array 88 * and process them after zcrypt_list_lock release. As we get/put 89 * the zqueue objects, we make sure they exist after lock release. 90 */ 91 list_for_each_entry(zq, &zc->zqueues, list) 92 maxzqs++; 93 if (maxzqs > 0) 94 zq_uelist = kcalloc(maxzqs + 1, sizeof(*zq_uelist), GFP_ATOMIC); 95 list_for_each_entry(zq, &zc->zqueues, list) 96 if (zcrypt_queue_force_online(zq, online)) 97 if (zq_uelist) { 98 zcrypt_queue_get(zq); 99 zq_uelist[i++] = zq; 100 } 101 spin_unlock(&zcrypt_list_lock); 102 if (zq_uelist) { 103 for (i = 0; zq_uelist[i]; i++) { 104 zq = zq_uelist[i]; 105 ap_send_online_uevent(&zq->queue->ap_dev, online); 106 zcrypt_queue_put(zq); 107 } 108 kfree(zq_uelist); 109 } 110 111 return count; 112 } 113 114 static DEVICE_ATTR_RW(online); 115 116 static ssize_t load_show(struct device *dev, 117 struct device_attribute *attr, 118 char *buf) 119 { 120 struct zcrypt_card *zc = dev_get_drvdata(dev); 121 122 return sysfs_emit(buf, "%d\n", atomic_read(&zc->load)); 123 } 124 125 static DEVICE_ATTR_RO(load); 126 127 static struct attribute *zcrypt_card_attrs[] = { 128 &dev_attr_type.attr, 129 &dev_attr_online.attr, 130 &dev_attr_load.attr, 131 NULL, 132 }; 133 134 static const struct attribute_group zcrypt_card_attr_group = { 135 .attrs = zcrypt_card_attrs, 136 }; 137 138 struct zcrypt_card *zcrypt_card_alloc(void) 139 { 140 struct zcrypt_card *zc; 141 142 zc = kzalloc(sizeof(*zc), GFP_KERNEL); 143 if (!zc) 144 return NULL; 145 INIT_LIST_HEAD(&zc->list); 146 INIT_LIST_HEAD(&zc->zqueues); 147 kref_init(&zc->refcount); 148 return zc; 149 } 150 EXPORT_SYMBOL(zcrypt_card_alloc); 151 152 void zcrypt_card_free(struct zcrypt_card *zc) 153 { 154 kfree(zc); 155 } 156 EXPORT_SYMBOL(zcrypt_card_free); 157 158 static void zcrypt_card_release(struct kref *kref) 159 { 160 struct zcrypt_card *zdev = 161 container_of(kref, struct zcrypt_card, refcount); 162 zcrypt_card_free(zdev); 163 } 164 165 void zcrypt_card_get(struct zcrypt_card *zc) 166 { 167 kref_get(&zc->refcount); 168 } 169 EXPORT_SYMBOL(zcrypt_card_get); 170 171 int zcrypt_card_put(struct zcrypt_card *zc) 172 { 173 return kref_put(&zc->refcount, zcrypt_card_release); 174 } 175 EXPORT_SYMBOL(zcrypt_card_put); 176 177 /** 178 * zcrypt_card_register() - Register a crypto card device. 179 * @zc: Pointer to a crypto card device 180 * 181 * Register a crypto card device. Returns 0 if successful. 182 */ 183 int zcrypt_card_register(struct zcrypt_card *zc) 184 { 185 int rc; 186 187 spin_lock(&zcrypt_list_lock); 188 list_add_tail(&zc->list, &zcrypt_card_list); 189 spin_unlock(&zcrypt_list_lock); 190 191 zc->online = 1; 192 193 ZCRYPT_DBF_INFO("%s card=%02x register online=1\n", 194 __func__, zc->card->id); 195 196 rc = sysfs_create_group(&zc->card->ap_dev.device.kobj, 197 &zcrypt_card_attr_group); 198 if (rc) { 199 spin_lock(&zcrypt_list_lock); 200 list_del_init(&zc->list); 201 spin_unlock(&zcrypt_list_lock); 202 } 203 204 return rc; 205 } 206 EXPORT_SYMBOL(zcrypt_card_register); 207 208 /** 209 * zcrypt_card_unregister(): Unregister a crypto card device. 210 * @zc: Pointer to crypto card device 211 * 212 * Unregister a crypto card device. 213 */ 214 void zcrypt_card_unregister(struct zcrypt_card *zc) 215 { 216 ZCRYPT_DBF_INFO("%s card=%02x unregister\n", 217 __func__, zc->card->id); 218 219 spin_lock(&zcrypt_list_lock); 220 list_del_init(&zc->list); 221 spin_unlock(&zcrypt_list_lock); 222 sysfs_remove_group(&zc->card->ap_dev.device.kobj, 223 &zcrypt_card_attr_group); 224 zcrypt_card_put(zc); 225 } 226 EXPORT_SYMBOL(zcrypt_card_unregister); 227