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 card devices. 39 */ 40 41 static ssize_t zcrypt_card_type_show(struct device *dev, 42 struct device_attribute *attr, char *buf) 43 { 44 struct zcrypt_card *zc = to_ap_card(dev)->private; 45 46 return snprintf(buf, PAGE_SIZE, "%s\n", zc->type_string); 47 } 48 49 static DEVICE_ATTR(type, 0444, zcrypt_card_type_show, NULL); 50 51 static ssize_t zcrypt_card_online_show(struct device *dev, 52 struct device_attribute *attr, 53 char *buf) 54 { 55 struct zcrypt_card *zc = to_ap_card(dev)->private; 56 57 return snprintf(buf, PAGE_SIZE, "%d\n", zc->online); 58 } 59 60 static ssize_t zcrypt_card_online_store(struct device *dev, 61 struct device_attribute *attr, 62 const char *buf, size_t count) 63 { 64 struct zcrypt_card *zc = to_ap_card(dev)->private; 65 struct zcrypt_queue *zq; 66 int online, id; 67 68 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) 69 return -EINVAL; 70 71 zc->online = online; 72 id = zc->card->id; 73 74 ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online); 75 76 spin_lock(&zcrypt_list_lock); 77 list_for_each_entry(zq, &zc->zqueues, list) 78 zcrypt_queue_force_online(zq, online); 79 spin_unlock(&zcrypt_list_lock); 80 return count; 81 } 82 83 static DEVICE_ATTR(online, 0644, zcrypt_card_online_show, 84 zcrypt_card_online_store); 85 86 static ssize_t zcrypt_card_load_show(struct device *dev, 87 struct device_attribute *attr, 88 char *buf) 89 { 90 struct zcrypt_card *zc = to_ap_card(dev)->private; 91 92 return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load)); 93 } 94 95 static DEVICE_ATTR(load, 0444, zcrypt_card_load_show, NULL); 96 97 static struct attribute *zcrypt_card_attrs[] = { 98 &dev_attr_type.attr, 99 &dev_attr_online.attr, 100 &dev_attr_load.attr, 101 NULL, 102 }; 103 104 static const struct attribute_group zcrypt_card_attr_group = { 105 .attrs = zcrypt_card_attrs, 106 }; 107 108 struct zcrypt_card *zcrypt_card_alloc(void) 109 { 110 struct zcrypt_card *zc; 111 112 zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL); 113 if (!zc) 114 return NULL; 115 INIT_LIST_HEAD(&zc->list); 116 INIT_LIST_HEAD(&zc->zqueues); 117 kref_init(&zc->refcount); 118 return zc; 119 } 120 EXPORT_SYMBOL(zcrypt_card_alloc); 121 122 void zcrypt_card_free(struct zcrypt_card *zc) 123 { 124 kfree(zc); 125 } 126 EXPORT_SYMBOL(zcrypt_card_free); 127 128 static void zcrypt_card_release(struct kref *kref) 129 { 130 struct zcrypt_card *zdev = 131 container_of(kref, struct zcrypt_card, refcount); 132 zcrypt_card_free(zdev); 133 } 134 135 void zcrypt_card_get(struct zcrypt_card *zc) 136 { 137 kref_get(&zc->refcount); 138 } 139 EXPORT_SYMBOL(zcrypt_card_get); 140 141 int zcrypt_card_put(struct zcrypt_card *zc) 142 { 143 return kref_put(&zc->refcount, zcrypt_card_release); 144 } 145 EXPORT_SYMBOL(zcrypt_card_put); 146 147 /** 148 * zcrypt_card_register() - Register a crypto card device. 149 * @zc: Pointer to a crypto card device 150 * 151 * Register a crypto card device. Returns 0 if successful. 152 */ 153 int zcrypt_card_register(struct zcrypt_card *zc) 154 { 155 int rc; 156 157 rc = sysfs_create_group(&zc->card->ap_dev.device.kobj, 158 &zcrypt_card_attr_group); 159 if (rc) 160 return rc; 161 162 spin_lock(&zcrypt_list_lock); 163 list_add_tail(&zc->list, &zcrypt_card_list); 164 spin_unlock(&zcrypt_list_lock); 165 166 zc->online = 1; 167 168 ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id); 169 170 return rc; 171 } 172 EXPORT_SYMBOL(zcrypt_card_register); 173 174 /** 175 * zcrypt_card_unregister(): Unregister a crypto card device. 176 * @zc: Pointer to crypto card device 177 * 178 * Unregister a crypto card device. 179 */ 180 void zcrypt_card_unregister(struct zcrypt_card *zc) 181 { 182 ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id); 183 184 spin_lock(&zcrypt_list_lock); 185 list_del_init(&zc->list); 186 spin_unlock(&zcrypt_list_lock); 187 sysfs_remove_group(&zc->card->ap_dev.device.kobj, 188 &zcrypt_card_attr_group); 189 } 190 EXPORT_SYMBOL(zcrypt_card_unregister); 191