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 if (!online) 74 ap_flush_queue(zq->queue); 75 return count; 76 } 77 78 static DEVICE_ATTR_RW(online); 79 80 static ssize_t load_show(struct device *dev, 81 struct device_attribute *attr, 82 char *buf) 83 { 84 struct zcrypt_queue *zq = to_ap_queue(dev)->private; 85 86 return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load)); 87 } 88 89 static DEVICE_ATTR_RO(load); 90 91 static struct attribute *zcrypt_queue_attrs[] = { 92 &dev_attr_online.attr, 93 &dev_attr_load.attr, 94 NULL, 95 }; 96 97 static const struct attribute_group zcrypt_queue_attr_group = { 98 .attrs = zcrypt_queue_attrs, 99 }; 100 101 void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) 102 { 103 zq->online = online; 104 if (!online) 105 ap_flush_queue(zq->queue); 106 } 107 108 struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size) 109 { 110 struct zcrypt_queue *zq; 111 112 zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL); 113 if (!zq) 114 return NULL; 115 zq->reply.msg = kmalloc(max_response_size, GFP_KERNEL); 116 if (!zq->reply.msg) 117 goto out_free; 118 zq->reply.len = max_response_size; 119 INIT_LIST_HEAD(&zq->list); 120 kref_init(&zq->refcount); 121 return zq; 122 123 out_free: 124 kfree(zq); 125 return NULL; 126 } 127 EXPORT_SYMBOL(zcrypt_queue_alloc); 128 129 void zcrypt_queue_free(struct zcrypt_queue *zq) 130 { 131 kfree(zq->reply.msg); 132 kfree(zq); 133 } 134 EXPORT_SYMBOL(zcrypt_queue_free); 135 136 static void zcrypt_queue_release(struct kref *kref) 137 { 138 struct zcrypt_queue *zq = 139 container_of(kref, struct zcrypt_queue, refcount); 140 zcrypt_queue_free(zq); 141 } 142 143 void zcrypt_queue_get(struct zcrypt_queue *zq) 144 { 145 kref_get(&zq->refcount); 146 } 147 EXPORT_SYMBOL(zcrypt_queue_get); 148 149 int zcrypt_queue_put(struct zcrypt_queue *zq) 150 { 151 return kref_put(&zq->refcount, zcrypt_queue_release); 152 } 153 EXPORT_SYMBOL(zcrypt_queue_put); 154 155 /** 156 * zcrypt_queue_register() - Register a crypto queue device. 157 * @zq: Pointer to a crypto queue device 158 * 159 * Register a crypto queue device. Returns 0 if successful. 160 */ 161 int zcrypt_queue_register(struct zcrypt_queue *zq) 162 { 163 struct zcrypt_card *zc; 164 int rc; 165 166 spin_lock(&zcrypt_list_lock); 167 zc = zq->queue->card->private; 168 zcrypt_card_get(zc); 169 zq->zcard = zc; 170 zq->online = 1; /* New devices are online by default. */ 171 172 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n", 173 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 174 175 list_add_tail(&zq->list, &zc->zqueues); 176 zcrypt_device_count++; 177 spin_unlock(&zcrypt_list_lock); 178 179 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj, 180 &zcrypt_queue_attr_group); 181 if (rc) 182 goto out; 183 184 if (zq->ops->rng) { 185 rc = zcrypt_rng_device_add(); 186 if (rc) 187 goto out_unregister; 188 } 189 return 0; 190 191 out_unregister: 192 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 193 &zcrypt_queue_attr_group); 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 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 zcrypt_card_put(zc); 226 } 227 EXPORT_SYMBOL(zcrypt_queue_unregister); 228