1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * zcrypt 2.1.0 4 * 5 * Copyright IBM Corp. 2001, 2012 6 * Author(s): Robert Burroughs 7 * Eric Rossman (edrossma@us.ibm.com) 8 * Cornelia Huck <cornelia.huck@de.ibm.com> 9 * 10 * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) 11 * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> 12 * Ralph Wuerthner <rwuerthn@de.ibm.com> 13 * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com> 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/interrupt.h> 19 #include <linux/miscdevice.h> 20 #include <linux/fs.h> 21 #include <linux/proc_fs.h> 22 #include <linux/seq_file.h> 23 #include <linux/compat.h> 24 #include <linux/slab.h> 25 #include <linux/atomic.h> 26 #include <linux/uaccess.h> 27 #include <linux/hw_random.h> 28 #include <linux/debugfs.h> 29 #include <asm/debug.h> 30 31 #include "zcrypt_debug.h" 32 #include "zcrypt_api.h" 33 34 #include "zcrypt_msgtype6.h" 35 #include "zcrypt_msgtype50.h" 36 37 /* 38 * Device attributes common for all crypto queue devices. 39 */ 40 41 static ssize_t zcrypt_queue_online_show(struct device *dev, 42 struct device_attribute *attr, 43 char *buf) 44 { 45 struct zcrypt_queue *zq = to_ap_queue(dev)->private; 46 47 return snprintf(buf, PAGE_SIZE, "%d\n", zq->online); 48 } 49 50 static ssize_t zcrypt_queue_online_store(struct device *dev, 51 struct device_attribute *attr, 52 const char *buf, size_t count) 53 { 54 struct zcrypt_queue *zq = to_ap_queue(dev)->private; 55 struct zcrypt_card *zc = zq->zcard; 56 int online; 57 58 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) 59 return -EINVAL; 60 61 if (online && !zc->online) 62 return -EINVAL; 63 zq->online = online; 64 65 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n", 66 AP_QID_CARD(zq->queue->qid), 67 AP_QID_QUEUE(zq->queue->qid), 68 online); 69 70 if (!online) 71 ap_flush_queue(zq->queue); 72 return count; 73 } 74 75 static DEVICE_ATTR(online, 0644, zcrypt_queue_online_show, 76 zcrypt_queue_online_store); 77 78 static struct attribute *zcrypt_queue_attrs[] = { 79 &dev_attr_online.attr, 80 NULL, 81 }; 82 83 static const struct attribute_group zcrypt_queue_attr_group = { 84 .attrs = zcrypt_queue_attrs, 85 }; 86 87 void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) 88 { 89 zq->online = online; 90 if (!online) 91 ap_flush_queue(zq->queue); 92 } 93 94 struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size) 95 { 96 struct zcrypt_queue *zq; 97 98 zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL); 99 if (!zq) 100 return NULL; 101 zq->reply.message = kmalloc(max_response_size, GFP_KERNEL); 102 if (!zq->reply.message) 103 goto out_free; 104 zq->reply.length = max_response_size; 105 INIT_LIST_HEAD(&zq->list); 106 kref_init(&zq->refcount); 107 return zq; 108 109 out_free: 110 kfree(zq); 111 return NULL; 112 } 113 EXPORT_SYMBOL(zcrypt_queue_alloc); 114 115 void zcrypt_queue_free(struct zcrypt_queue *zq) 116 { 117 kfree(zq->reply.message); 118 kfree(zq); 119 } 120 EXPORT_SYMBOL(zcrypt_queue_free); 121 122 static void zcrypt_queue_release(struct kref *kref) 123 { 124 struct zcrypt_queue *zq = 125 container_of(kref, struct zcrypt_queue, refcount); 126 zcrypt_queue_free(zq); 127 } 128 129 void zcrypt_queue_get(struct zcrypt_queue *zq) 130 { 131 kref_get(&zq->refcount); 132 } 133 EXPORT_SYMBOL(zcrypt_queue_get); 134 135 int zcrypt_queue_put(struct zcrypt_queue *zq) 136 { 137 return kref_put(&zq->refcount, zcrypt_queue_release); 138 } 139 EXPORT_SYMBOL(zcrypt_queue_put); 140 141 /** 142 * zcrypt_queue_register() - Register a crypto queue device. 143 * @zq: Pointer to a crypto queue device 144 * 145 * Register a crypto queue device. Returns 0 if successful. 146 */ 147 int zcrypt_queue_register(struct zcrypt_queue *zq) 148 { 149 struct zcrypt_card *zc; 150 int rc; 151 152 spin_lock(&zcrypt_list_lock); 153 zc = zq->queue->card->private; 154 zcrypt_card_get(zc); 155 zq->zcard = zc; 156 zq->online = 1; /* New devices are online by default. */ 157 158 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n", 159 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 160 161 list_add_tail(&zq->list, &zc->zqueues); 162 zcrypt_device_count++; 163 spin_unlock(&zcrypt_list_lock); 164 165 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj, 166 &zcrypt_queue_attr_group); 167 if (rc) 168 goto out; 169 get_device(&zq->queue->ap_dev.device); 170 171 if (zq->ops->rng) { 172 rc = zcrypt_rng_device_add(); 173 if (rc) 174 goto out_unregister; 175 } 176 return 0; 177 178 out_unregister: 179 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 180 &zcrypt_queue_attr_group); 181 put_device(&zq->queue->ap_dev.device); 182 out: 183 spin_lock(&zcrypt_list_lock); 184 list_del_init(&zq->list); 185 spin_unlock(&zcrypt_list_lock); 186 zcrypt_card_put(zc); 187 return rc; 188 } 189 EXPORT_SYMBOL(zcrypt_queue_register); 190 191 /** 192 * zcrypt_queue_unregister(): Unregister a crypto queue device. 193 * @zq: Pointer to crypto queue device 194 * 195 * Unregister a crypto queue device. 196 */ 197 void zcrypt_queue_unregister(struct zcrypt_queue *zq) 198 { 199 struct zcrypt_card *zc; 200 201 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n", 202 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 203 204 zc = zq->zcard; 205 spin_lock(&zcrypt_list_lock); 206 list_del_init(&zq->list); 207 zcrypt_device_count--; 208 spin_unlock(&zcrypt_list_lock); 209 zcrypt_card_put(zc); 210 if (zq->ops->rng) 211 zcrypt_rng_device_remove(); 212 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 213 &zcrypt_queue_attr_group); 214 put_device(&zq->queue->ap_dev.device); 215 zcrypt_queue_put(zq); 216 } 217 EXPORT_SYMBOL(zcrypt_queue_unregister); 218