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 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 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_RW(online); 76 77 static ssize_t load_show(struct device *dev, 78 struct device_attribute *attr, 79 char *buf) 80 { 81 struct zcrypt_queue *zq = to_ap_queue(dev)->private; 82 83 return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load)); 84 } 85 86 static DEVICE_ATTR_RO(load); 87 88 static struct attribute *zcrypt_queue_attrs[] = { 89 &dev_attr_online.attr, 90 &dev_attr_load.attr, 91 NULL, 92 }; 93 94 static const struct attribute_group zcrypt_queue_attr_group = { 95 .attrs = zcrypt_queue_attrs, 96 }; 97 98 void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) 99 { 100 zq->online = online; 101 if (!online) 102 ap_flush_queue(zq->queue); 103 } 104 105 struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size) 106 { 107 struct zcrypt_queue *zq; 108 109 zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL); 110 if (!zq) 111 return NULL; 112 zq->reply.message = kmalloc(max_response_size, GFP_KERNEL); 113 if (!zq->reply.message) 114 goto out_free; 115 zq->reply.length = max_response_size; 116 INIT_LIST_HEAD(&zq->list); 117 kref_init(&zq->refcount); 118 return zq; 119 120 out_free: 121 kfree(zq); 122 return NULL; 123 } 124 EXPORT_SYMBOL(zcrypt_queue_alloc); 125 126 void zcrypt_queue_free(struct zcrypt_queue *zq) 127 { 128 kfree(zq->reply.message); 129 kfree(zq); 130 } 131 EXPORT_SYMBOL(zcrypt_queue_free); 132 133 static void zcrypt_queue_release(struct kref *kref) 134 { 135 struct zcrypt_queue *zq = 136 container_of(kref, struct zcrypt_queue, refcount); 137 zcrypt_queue_free(zq); 138 } 139 140 void zcrypt_queue_get(struct zcrypt_queue *zq) 141 { 142 kref_get(&zq->refcount); 143 } 144 EXPORT_SYMBOL(zcrypt_queue_get); 145 146 int zcrypt_queue_put(struct zcrypt_queue *zq) 147 { 148 return kref_put(&zq->refcount, zcrypt_queue_release); 149 } 150 EXPORT_SYMBOL(zcrypt_queue_put); 151 152 /** 153 * zcrypt_queue_register() - Register a crypto queue device. 154 * @zq: Pointer to a crypto queue device 155 * 156 * Register a crypto queue device. Returns 0 if successful. 157 */ 158 int zcrypt_queue_register(struct zcrypt_queue *zq) 159 { 160 struct zcrypt_card *zc; 161 int rc; 162 163 spin_lock(&zcrypt_list_lock); 164 zc = zq->queue->card->private; 165 zcrypt_card_get(zc); 166 zq->zcard = zc; 167 zq->online = 1; /* New devices are online by default. */ 168 169 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n", 170 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 171 172 list_add_tail(&zq->list, &zc->zqueues); 173 zcrypt_device_count++; 174 spin_unlock(&zcrypt_list_lock); 175 176 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj, 177 &zcrypt_queue_attr_group); 178 if (rc) 179 goto out; 180 get_device(&zq->queue->ap_dev.device); 181 182 if (zq->ops->rng) { 183 rc = zcrypt_rng_device_add(); 184 if (rc) 185 goto out_unregister; 186 } 187 return 0; 188 189 out_unregister: 190 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 191 &zcrypt_queue_attr_group); 192 put_device(&zq->queue->ap_dev.device); 193 out: 194 spin_lock(&zcrypt_list_lock); 195 list_del_init(&zq->list); 196 spin_unlock(&zcrypt_list_lock); 197 zcrypt_card_put(zc); 198 return rc; 199 } 200 EXPORT_SYMBOL(zcrypt_queue_register); 201 202 /** 203 * zcrypt_queue_unregister(): Unregister a crypto queue device. 204 * @zq: Pointer to crypto queue device 205 * 206 * Unregister a crypto queue device. 207 */ 208 void zcrypt_queue_unregister(struct zcrypt_queue *zq) 209 { 210 struct zcrypt_card *zc; 211 212 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n", 213 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 214 215 zc = zq->zcard; 216 spin_lock(&zcrypt_list_lock); 217 list_del_init(&zq->list); 218 zcrypt_device_count--; 219 spin_unlock(&zcrypt_list_lock); 220 zcrypt_card_put(zc); 221 if (zq->ops->rng) 222 zcrypt_rng_device_remove(); 223 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 224 &zcrypt_queue_attr_group); 225 put_device(&zq->queue->ap_dev.device); 226 zcrypt_queue_put(zq); 227 } 228 EXPORT_SYMBOL(zcrypt_queue_unregister); 229