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 ssize_t zcrypt_queue_load_show(struct device *dev, 79 struct device_attribute *attr, 80 char *buf) 81 { 82 struct zcrypt_queue *zq = to_ap_queue(dev)->private; 83 84 return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load)); 85 } 86 87 static DEVICE_ATTR(load, 0444, zcrypt_queue_load_show, NULL); 88 89 static struct attribute *zcrypt_queue_attrs[] = { 90 &dev_attr_online.attr, 91 &dev_attr_load.attr, 92 NULL, 93 }; 94 95 static const struct attribute_group zcrypt_queue_attr_group = { 96 .attrs = zcrypt_queue_attrs, 97 }; 98 99 void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) 100 { 101 zq->online = online; 102 if (!online) 103 ap_flush_queue(zq->queue); 104 } 105 106 struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size) 107 { 108 struct zcrypt_queue *zq; 109 110 zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL); 111 if (!zq) 112 return NULL; 113 zq->reply.message = kmalloc(max_response_size, GFP_KERNEL); 114 if (!zq->reply.message) 115 goto out_free; 116 zq->reply.length = max_response_size; 117 INIT_LIST_HEAD(&zq->list); 118 kref_init(&zq->refcount); 119 return zq; 120 121 out_free: 122 kfree(zq); 123 return NULL; 124 } 125 EXPORT_SYMBOL(zcrypt_queue_alloc); 126 127 void zcrypt_queue_free(struct zcrypt_queue *zq) 128 { 129 kfree(zq->reply.message); 130 kfree(zq); 131 } 132 EXPORT_SYMBOL(zcrypt_queue_free); 133 134 static void zcrypt_queue_release(struct kref *kref) 135 { 136 struct zcrypt_queue *zq = 137 container_of(kref, struct zcrypt_queue, refcount); 138 zcrypt_queue_free(zq); 139 } 140 141 void zcrypt_queue_get(struct zcrypt_queue *zq) 142 { 143 kref_get(&zq->refcount); 144 } 145 EXPORT_SYMBOL(zcrypt_queue_get); 146 147 int zcrypt_queue_put(struct zcrypt_queue *zq) 148 { 149 return kref_put(&zq->refcount, zcrypt_queue_release); 150 } 151 EXPORT_SYMBOL(zcrypt_queue_put); 152 153 /** 154 * zcrypt_queue_register() - Register a crypto queue device. 155 * @zq: Pointer to a crypto queue device 156 * 157 * Register a crypto queue device. Returns 0 if successful. 158 */ 159 int zcrypt_queue_register(struct zcrypt_queue *zq) 160 { 161 struct zcrypt_card *zc; 162 int rc; 163 164 spin_lock(&zcrypt_list_lock); 165 zc = zq->queue->card->private; 166 zcrypt_card_get(zc); 167 zq->zcard = zc; 168 zq->online = 1; /* New devices are online by default. */ 169 170 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n", 171 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 172 173 list_add_tail(&zq->list, &zc->zqueues); 174 zcrypt_device_count++; 175 spin_unlock(&zcrypt_list_lock); 176 177 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj, 178 &zcrypt_queue_attr_group); 179 if (rc) 180 goto out; 181 get_device(&zq->queue->ap_dev.device); 182 183 if (zq->ops->rng) { 184 rc = zcrypt_rng_device_add(); 185 if (rc) 186 goto out_unregister; 187 } 188 return 0; 189 190 out_unregister: 191 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 192 &zcrypt_queue_attr_group); 193 put_device(&zq->queue->ap_dev.device); 194 out: 195 spin_lock(&zcrypt_list_lock); 196 list_del_init(&zq->list); 197 spin_unlock(&zcrypt_list_lock); 198 zcrypt_card_put(zc); 199 return rc; 200 } 201 EXPORT_SYMBOL(zcrypt_queue_register); 202 203 /** 204 * zcrypt_queue_unregister(): Unregister a crypto queue device. 205 * @zq: Pointer to crypto queue device 206 * 207 * Unregister a crypto queue device. 208 */ 209 void zcrypt_queue_unregister(struct zcrypt_queue *zq) 210 { 211 struct zcrypt_card *zc; 212 213 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n", 214 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 215 216 zc = zq->zcard; 217 spin_lock(&zcrypt_list_lock); 218 list_del_init(&zq->list); 219 zcrypt_device_count--; 220 spin_unlock(&zcrypt_list_lock); 221 zcrypt_card_put(zc); 222 if (zq->ops->rng) 223 zcrypt_rng_device_remove(); 224 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 225 &zcrypt_queue_attr_group); 226 put_device(&zq->queue->ap_dev.device); 227 zcrypt_queue_put(zq); 228 } 229 EXPORT_SYMBOL(zcrypt_queue_unregister); 230