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 zcrypt_queue *zq = dev_get_drvdata(dev); 44 struct ap_queue *aq = to_ap_queue(dev); 45 int online = aq->config && zq->online ? 1 : 0; 46 47 return sysfs_emit(buf, "%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 zcrypt_queue *zq = dev_get_drvdata(dev); 55 struct ap_queue *aq = to_ap_queue(dev); 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_INFO("%s queue=%02x.%04x online=%d\n", 69 __func__, AP_QID_CARD(zq->queue->qid), 70 AP_QID_QUEUE(zq->queue->qid), online); 71 72 ap_send_online_uevent(&aq->ap_dev, online); 73 74 if (!online) 75 ap_flush_queue(zq->queue); 76 return count; 77 } 78 79 static DEVICE_ATTR_RW(online); 80 81 static ssize_t load_show(struct device *dev, 82 struct device_attribute *attr, 83 char *buf) 84 { 85 struct zcrypt_queue *zq = dev_get_drvdata(dev); 86 87 return sysfs_emit(buf, "%d\n", atomic_read(&zq->load)); 88 } 89 90 static DEVICE_ATTR_RO(load); 91 92 static struct attribute *zcrypt_queue_attrs[] = { 93 &dev_attr_online.attr, 94 &dev_attr_load.attr, 95 NULL, 96 }; 97 98 static const struct attribute_group zcrypt_queue_attr_group = { 99 .attrs = zcrypt_queue_attrs, 100 }; 101 102 bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) 103 { 104 if (!!zq->online != !!online) { 105 zq->online = online; 106 if (!online) 107 ap_flush_queue(zq->queue); 108 return true; 109 } 110 return false; 111 } 112 113 struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size) 114 { 115 struct zcrypt_queue *zq; 116 117 zq = kzalloc(sizeof(*zq), GFP_KERNEL); 118 if (!zq) 119 return NULL; 120 zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL); 121 if (!zq->reply.msg) 122 goto out_free; 123 zq->reply.bufsize = reply_buf_size; 124 INIT_LIST_HEAD(&zq->list); 125 kref_init(&zq->refcount); 126 return zq; 127 128 out_free: 129 kfree(zq); 130 return NULL; 131 } 132 EXPORT_SYMBOL(zcrypt_queue_alloc); 133 134 void zcrypt_queue_free(struct zcrypt_queue *zq) 135 { 136 kfree(zq->reply.msg); 137 kfree(zq); 138 } 139 EXPORT_SYMBOL(zcrypt_queue_free); 140 141 static void zcrypt_queue_release(struct kref *kref) 142 { 143 struct zcrypt_queue *zq = 144 container_of(kref, struct zcrypt_queue, refcount); 145 zcrypt_queue_free(zq); 146 } 147 148 void zcrypt_queue_get(struct zcrypt_queue *zq) 149 { 150 kref_get(&zq->refcount); 151 } 152 EXPORT_SYMBOL(zcrypt_queue_get); 153 154 int zcrypt_queue_put(struct zcrypt_queue *zq) 155 { 156 return kref_put(&zq->refcount, zcrypt_queue_release); 157 } 158 EXPORT_SYMBOL(zcrypt_queue_put); 159 160 /** 161 * zcrypt_queue_register() - Register a crypto queue device. 162 * @zq: Pointer to a crypto queue device 163 * 164 * Register a crypto queue device. Returns 0 if successful. 165 */ 166 int zcrypt_queue_register(struct zcrypt_queue *zq) 167 { 168 struct zcrypt_card *zc; 169 int rc; 170 171 spin_lock(&zcrypt_list_lock); 172 zc = dev_get_drvdata(&zq->queue->card->ap_dev.device); 173 zcrypt_card_get(zc); 174 zq->zcard = zc; 175 zq->online = 1; /* New devices are online by default. */ 176 177 ZCRYPT_DBF_INFO("%s queue=%02x.%04x register online=1\n", 178 __func__, AP_QID_CARD(zq->queue->qid), 179 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_INFO("%s queue=%02x.%04x unregister\n", 219 __func__, AP_QID_CARD(zq->queue->qid), 220 AP_QID_QUEUE(zq->queue->qid)); 221 222 zc = zq->zcard; 223 spin_lock(&zcrypt_list_lock); 224 list_del_init(&zq->list); 225 spin_unlock(&zcrypt_list_lock); 226 if (zq->ops->rng) 227 zcrypt_rng_device_remove(); 228 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 229 &zcrypt_queue_attr_group); 230 zcrypt_card_put(zc); 231 zcrypt_queue_put(zq); 232 } 233 EXPORT_SYMBOL(zcrypt_queue_unregister); 234