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 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_RO(type); 50 51 static ssize_t 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 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_RW(online); 84 85 static ssize_t load_show(struct device *dev, 86 struct device_attribute *attr, 87 char *buf) 88 { 89 struct zcrypt_card *zc = to_ap_card(dev)->private; 90 91 return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load)); 92 } 93 94 static DEVICE_ATTR_RO(load); 95 96 static struct attribute *zcrypt_card_attrs[] = { 97 &dev_attr_type.attr, 98 &dev_attr_online.attr, 99 &dev_attr_load.attr, 100 NULL, 101 }; 102 103 static const struct attribute_group zcrypt_card_attr_group = { 104 .attrs = zcrypt_card_attrs, 105 }; 106 107 struct zcrypt_card *zcrypt_card_alloc(void) 108 { 109 struct zcrypt_card *zc; 110 111 zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL); 112 if (!zc) 113 return NULL; 114 INIT_LIST_HEAD(&zc->list); 115 INIT_LIST_HEAD(&zc->zqueues); 116 kref_init(&zc->refcount); 117 return zc; 118 } 119 EXPORT_SYMBOL(zcrypt_card_alloc); 120 121 void zcrypt_card_free(struct zcrypt_card *zc) 122 { 123 kfree(zc); 124 } 125 EXPORT_SYMBOL(zcrypt_card_free); 126 127 static void zcrypt_card_release(struct kref *kref) 128 { 129 struct zcrypt_card *zdev = 130 container_of(kref, struct zcrypt_card, refcount); 131 zcrypt_card_free(zdev); 132 } 133 134 void zcrypt_card_get(struct zcrypt_card *zc) 135 { 136 kref_get(&zc->refcount); 137 } 138 EXPORT_SYMBOL(zcrypt_card_get); 139 140 int zcrypt_card_put(struct zcrypt_card *zc) 141 { 142 return kref_put(&zc->refcount, zcrypt_card_release); 143 } 144 EXPORT_SYMBOL(zcrypt_card_put); 145 146 /** 147 * zcrypt_card_register() - Register a crypto card device. 148 * @zc: Pointer to a crypto card device 149 * 150 * Register a crypto card device. Returns 0 if successful. 151 */ 152 int zcrypt_card_register(struct zcrypt_card *zc) 153 { 154 int rc; 155 156 rc = sysfs_create_group(&zc->card->ap_dev.device.kobj, 157 &zcrypt_card_attr_group); 158 if (rc) 159 return rc; 160 161 spin_lock(&zcrypt_list_lock); 162 list_add_tail(&zc->list, &zcrypt_card_list); 163 spin_unlock(&zcrypt_list_lock); 164 165 zc->online = 1; 166 167 ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id); 168 169 return rc; 170 } 171 EXPORT_SYMBOL(zcrypt_card_register); 172 173 /** 174 * zcrypt_card_unregister(): Unregister a crypto card device. 175 * @zc: Pointer to crypto card device 176 * 177 * Unregister a crypto card device. 178 */ 179 void zcrypt_card_unregister(struct zcrypt_card *zc) 180 { 181 ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id); 182 183 spin_lock(&zcrypt_list_lock); 184 list_del_init(&zc->list); 185 spin_unlock(&zcrypt_list_lock); 186 sysfs_remove_group(&zc->card->ap_dev.device.kobj, 187 &zcrypt_card_attr_group); 188 } 189 EXPORT_SYMBOL(zcrypt_card_unregister); 190