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