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 queue devices. 37 */ 38 39 static ssize_t online_show(struct device *dev, 40 struct device_attribute *attr, 41 char *buf) 42 { 43 struct ap_queue *aq = to_ap_queue(dev); 44 struct zcrypt_queue *zq = aq->private; 45 int online = aq->config && zq->online ? 1 : 0; 46 47 return scnprintf(buf, PAGE_SIZE, "%d\n", 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 ap_queue *aq = to_ap_queue(dev); 55 struct zcrypt_queue *zq = aq->private; 56 struct zcrypt_card *zc = zq->zcard; 57 int online; 58 59 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) 60 return -EINVAL; 61 62 if (online && (!aq->config || !aq->card->config)) 63 return -ENODEV; 64 if (online && !zc->online) 65 return -EINVAL; 66 zq->online = online; 67 68 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n", 69 AP_QID_CARD(zq->queue->qid), 70 AP_QID_QUEUE(zq->queue->qid), 71 online); 72 73 ap_send_online_uevent(&aq->ap_dev, online); 74 75 if (!online) 76 ap_flush_queue(zq->queue); 77 return count; 78 } 79 80 static DEVICE_ATTR_RW(online); 81 82 static ssize_t load_show(struct device *dev, 83 struct device_attribute *attr, 84 char *buf) 85 { 86 struct zcrypt_queue *zq = to_ap_queue(dev)->private; 87 88 return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load)); 89 } 90 91 static DEVICE_ATTR_RO(load); 92 93 static struct attribute *zcrypt_queue_attrs[] = { 94 &dev_attr_online.attr, 95 &dev_attr_load.attr, 96 NULL, 97 }; 98 99 static const struct attribute_group zcrypt_queue_attr_group = { 100 .attrs = zcrypt_queue_attrs, 101 }; 102 103 bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) 104 { 105 if (!!zq->online != !!online) { 106 zq->online = online; 107 if (!online) 108 ap_flush_queue(zq->queue); 109 return true; 110 } 111 return false; 112 } 113 114 struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size) 115 { 116 struct zcrypt_queue *zq; 117 118 zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL); 119 if (!zq) 120 return NULL; 121 zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL); 122 if (!zq->reply.msg) 123 goto out_free; 124 zq->reply.bufsize = reply_buf_size; 125 INIT_LIST_HEAD(&zq->list); 126 kref_init(&zq->refcount); 127 return zq; 128 129 out_free: 130 kfree(zq); 131 return NULL; 132 } 133 EXPORT_SYMBOL(zcrypt_queue_alloc); 134 135 void zcrypt_queue_free(struct zcrypt_queue *zq) 136 { 137 kfree(zq->reply.msg); 138 kfree(zq); 139 } 140 EXPORT_SYMBOL(zcrypt_queue_free); 141 142 static void zcrypt_queue_release(struct kref *kref) 143 { 144 struct zcrypt_queue *zq = 145 container_of(kref, struct zcrypt_queue, refcount); 146 zcrypt_queue_free(zq); 147 } 148 149 void zcrypt_queue_get(struct zcrypt_queue *zq) 150 { 151 kref_get(&zq->refcount); 152 } 153 EXPORT_SYMBOL(zcrypt_queue_get); 154 155 int zcrypt_queue_put(struct zcrypt_queue *zq) 156 { 157 return kref_put(&zq->refcount, zcrypt_queue_release); 158 } 159 EXPORT_SYMBOL(zcrypt_queue_put); 160 161 /** 162 * zcrypt_queue_register() - Register a crypto queue device. 163 * @zq: Pointer to a crypto queue device 164 * 165 * Register a crypto queue device. Returns 0 if successful. 166 */ 167 int zcrypt_queue_register(struct zcrypt_queue *zq) 168 { 169 struct zcrypt_card *zc; 170 int rc; 171 172 spin_lock(&zcrypt_list_lock); 173 zc = zq->queue->card->private; 174 zcrypt_card_get(zc); 175 zq->zcard = zc; 176 zq->online = 1; /* New devices are online by default. */ 177 178 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n", 179 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 180 181 list_add_tail(&zq->list, &zc->zqueues); 182 spin_unlock(&zcrypt_list_lock); 183 184 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj, 185 &zcrypt_queue_attr_group); 186 if (rc) 187 goto out; 188 189 if (zq->ops->rng) { 190 rc = zcrypt_rng_device_add(); 191 if (rc) 192 goto out_unregister; 193 } 194 return 0; 195 196 out_unregister: 197 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 198 &zcrypt_queue_attr_group); 199 out: 200 spin_lock(&zcrypt_list_lock); 201 list_del_init(&zq->list); 202 spin_unlock(&zcrypt_list_lock); 203 zcrypt_card_put(zc); 204 return rc; 205 } 206 EXPORT_SYMBOL(zcrypt_queue_register); 207 208 /** 209 * zcrypt_queue_unregister(): Unregister a crypto queue device. 210 * @zq: Pointer to crypto queue device 211 * 212 * Unregister a crypto queue device. 213 */ 214 void zcrypt_queue_unregister(struct zcrypt_queue *zq) 215 { 216 struct zcrypt_card *zc; 217 218 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n", 219 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 220 221 zc = zq->zcard; 222 spin_lock(&zcrypt_list_lock); 223 list_del_init(&zq->list); 224 spin_unlock(&zcrypt_list_lock); 225 if (zq->ops->rng) 226 zcrypt_rng_device_remove(); 227 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 228 &zcrypt_queue_attr_group); 229 zcrypt_card_put(zc); 230 zcrypt_queue_put(zq); 231 } 232 EXPORT_SYMBOL(zcrypt_queue_unregister); 233