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 = to_ap_queue(dev)->private; 44 45 return scnprintf(buf, PAGE_SIZE, "%d\n", zq->online); 46 } 47 48 static ssize_t online_store(struct device *dev, 49 struct device_attribute *attr, 50 const char *buf, size_t count) 51 { 52 struct zcrypt_queue *zq = to_ap_queue(dev)->private; 53 struct zcrypt_card *zc = zq->zcard; 54 int online; 55 56 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) 57 return -EINVAL; 58 59 if (online && !zc->online) 60 return -EINVAL; 61 zq->online = online; 62 63 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n", 64 AP_QID_CARD(zq->queue->qid), 65 AP_QID_QUEUE(zq->queue->qid), 66 online); 67 68 if (!online) 69 ap_flush_queue(zq->queue); 70 return count; 71 } 72 73 static DEVICE_ATTR_RW(online); 74 75 static ssize_t load_show(struct device *dev, 76 struct device_attribute *attr, 77 char *buf) 78 { 79 struct zcrypt_queue *zq = to_ap_queue(dev)->private; 80 81 return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load)); 82 } 83 84 static DEVICE_ATTR_RO(load); 85 86 static struct attribute *zcrypt_queue_attrs[] = { 87 &dev_attr_online.attr, 88 &dev_attr_load.attr, 89 NULL, 90 }; 91 92 static const struct attribute_group zcrypt_queue_attr_group = { 93 .attrs = zcrypt_queue_attrs, 94 }; 95 96 void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) 97 { 98 zq->online = online; 99 if (!online) 100 ap_flush_queue(zq->queue); 101 } 102 103 struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size) 104 { 105 struct zcrypt_queue *zq; 106 107 zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL); 108 if (!zq) 109 return NULL; 110 zq->reply.message = kmalloc(max_response_size, GFP_KERNEL); 111 if (!zq->reply.message) 112 goto out_free; 113 zq->reply.length = max_response_size; 114 INIT_LIST_HEAD(&zq->list); 115 kref_init(&zq->refcount); 116 return zq; 117 118 out_free: 119 kfree(zq); 120 return NULL; 121 } 122 EXPORT_SYMBOL(zcrypt_queue_alloc); 123 124 void zcrypt_queue_free(struct zcrypt_queue *zq) 125 { 126 kfree(zq->reply.message); 127 kfree(zq); 128 } 129 EXPORT_SYMBOL(zcrypt_queue_free); 130 131 static void zcrypt_queue_release(struct kref *kref) 132 { 133 struct zcrypt_queue *zq = 134 container_of(kref, struct zcrypt_queue, refcount); 135 zcrypt_queue_free(zq); 136 } 137 138 void zcrypt_queue_get(struct zcrypt_queue *zq) 139 { 140 kref_get(&zq->refcount); 141 } 142 EXPORT_SYMBOL(zcrypt_queue_get); 143 144 int zcrypt_queue_put(struct zcrypt_queue *zq) 145 { 146 return kref_put(&zq->refcount, zcrypt_queue_release); 147 } 148 EXPORT_SYMBOL(zcrypt_queue_put); 149 150 /** 151 * zcrypt_queue_register() - Register a crypto queue device. 152 * @zq: Pointer to a crypto queue device 153 * 154 * Register a crypto queue device. Returns 0 if successful. 155 */ 156 int zcrypt_queue_register(struct zcrypt_queue *zq) 157 { 158 struct zcrypt_card *zc; 159 int rc; 160 161 spin_lock(&zcrypt_list_lock); 162 zc = zq->queue->card->private; 163 zcrypt_card_get(zc); 164 zq->zcard = zc; 165 zq->online = 1; /* New devices are online by default. */ 166 167 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n", 168 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 169 170 list_add_tail(&zq->list, &zc->zqueues); 171 zcrypt_device_count++; 172 spin_unlock(&zcrypt_list_lock); 173 174 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj, 175 &zcrypt_queue_attr_group); 176 if (rc) 177 goto out; 178 get_device(&zq->queue->ap_dev.device); 179 180 if (zq->ops->rng) { 181 rc = zcrypt_rng_device_add(); 182 if (rc) 183 goto out_unregister; 184 } 185 return 0; 186 187 out_unregister: 188 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 189 &zcrypt_queue_attr_group); 190 put_device(&zq->queue->ap_dev.device); 191 out: 192 spin_lock(&zcrypt_list_lock); 193 list_del_init(&zq->list); 194 spin_unlock(&zcrypt_list_lock); 195 zcrypt_card_put(zc); 196 return rc; 197 } 198 EXPORT_SYMBOL(zcrypt_queue_register); 199 200 /** 201 * zcrypt_queue_unregister(): Unregister a crypto queue device. 202 * @zq: Pointer to crypto queue device 203 * 204 * Unregister a crypto queue device. 205 */ 206 void zcrypt_queue_unregister(struct zcrypt_queue *zq) 207 { 208 struct zcrypt_card *zc; 209 210 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n", 211 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); 212 213 zc = zq->zcard; 214 spin_lock(&zcrypt_list_lock); 215 list_del_init(&zq->list); 216 zcrypt_device_count--; 217 spin_unlock(&zcrypt_list_lock); 218 zcrypt_card_put(zc); 219 if (zq->ops->rng) 220 zcrypt_rng_device_remove(); 221 sysfs_remove_group(&zq->queue->ap_dev.device.kobj, 222 &zcrypt_queue_attr_group); 223 put_device(&zq->queue->ap_dev.device); 224 zcrypt_queue_put(zq); 225 } 226 EXPORT_SYMBOL(zcrypt_queue_unregister); 227