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 card devices. 37 */ 38 39 static ssize_t type_show(struct device *dev, 40 struct device_attribute *attr, char *buf) 41 { 42 struct zcrypt_card *zc = to_ap_card(dev)->private; 43 44 return scnprintf(buf, PAGE_SIZE, "%s\n", zc->type_string); 45 } 46 47 static DEVICE_ATTR_RO(type); 48 49 static ssize_t online_show(struct device *dev, 50 struct device_attribute *attr, 51 char *buf) 52 { 53 struct ap_card *ac = to_ap_card(dev); 54 struct zcrypt_card *zc = ac->private; 55 int online = ac->config && zc->online ? 1 : 0; 56 57 return scnprintf(buf, PAGE_SIZE, "%d\n", 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 ap_card *ac = to_ap_card(dev); 65 struct zcrypt_card *zc = ac->private; 66 struct zcrypt_queue *zq; 67 int online, id; 68 69 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) 70 return -EINVAL; 71 72 if (online && !ac->config) 73 return -ENODEV; 74 75 zc->online = online; 76 id = zc->card->id; 77 78 ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online); 79 80 spin_lock(&zcrypt_list_lock); 81 list_for_each_entry(zq, &zc->zqueues, list) 82 zcrypt_queue_force_online(zq, online); 83 spin_unlock(&zcrypt_list_lock); 84 return count; 85 } 86 87 static DEVICE_ATTR_RW(online); 88 89 static ssize_t load_show(struct device *dev, 90 struct device_attribute *attr, 91 char *buf) 92 { 93 struct zcrypt_card *zc = to_ap_card(dev)->private; 94 95 return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load)); 96 } 97 98 static DEVICE_ATTR_RO(load); 99 100 static struct attribute *zcrypt_card_attrs[] = { 101 &dev_attr_type.attr, 102 &dev_attr_online.attr, 103 &dev_attr_load.attr, 104 NULL, 105 }; 106 107 static const struct attribute_group zcrypt_card_attr_group = { 108 .attrs = zcrypt_card_attrs, 109 }; 110 111 struct zcrypt_card *zcrypt_card_alloc(void) 112 { 113 struct zcrypt_card *zc; 114 115 zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL); 116 if (!zc) 117 return NULL; 118 INIT_LIST_HEAD(&zc->list); 119 INIT_LIST_HEAD(&zc->zqueues); 120 kref_init(&zc->refcount); 121 return zc; 122 } 123 EXPORT_SYMBOL(zcrypt_card_alloc); 124 125 void zcrypt_card_free(struct zcrypt_card *zc) 126 { 127 kfree(zc); 128 } 129 EXPORT_SYMBOL(zcrypt_card_free); 130 131 static void zcrypt_card_release(struct kref *kref) 132 { 133 struct zcrypt_card *zdev = 134 container_of(kref, struct zcrypt_card, refcount); 135 zcrypt_card_free(zdev); 136 } 137 138 void zcrypt_card_get(struct zcrypt_card *zc) 139 { 140 kref_get(&zc->refcount); 141 } 142 EXPORT_SYMBOL(zcrypt_card_get); 143 144 int zcrypt_card_put(struct zcrypt_card *zc) 145 { 146 return kref_put(&zc->refcount, zcrypt_card_release); 147 } 148 EXPORT_SYMBOL(zcrypt_card_put); 149 150 /** 151 * zcrypt_card_register() - Register a crypto card device. 152 * @zc: Pointer to a crypto card device 153 * 154 * Register a crypto card device. Returns 0 if successful. 155 */ 156 int zcrypt_card_register(struct zcrypt_card *zc) 157 { 158 int rc; 159 160 spin_lock(&zcrypt_list_lock); 161 list_add_tail(&zc->list, &zcrypt_card_list); 162 spin_unlock(&zcrypt_list_lock); 163 164 zc->online = 1; 165 166 ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id); 167 168 rc = sysfs_create_group(&zc->card->ap_dev.device.kobj, 169 &zcrypt_card_attr_group); 170 if (rc) { 171 spin_lock(&zcrypt_list_lock); 172 list_del_init(&zc->list); 173 spin_unlock(&zcrypt_list_lock); 174 } 175 176 return rc; 177 } 178 EXPORT_SYMBOL(zcrypt_card_register); 179 180 /** 181 * zcrypt_card_unregister(): Unregister a crypto card device. 182 * @zc: Pointer to crypto card device 183 * 184 * Unregister a crypto card device. 185 */ 186 void zcrypt_card_unregister(struct zcrypt_card *zc) 187 { 188 ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id); 189 190 spin_lock(&zcrypt_list_lock); 191 list_del_init(&zc->list); 192 spin_unlock(&zcrypt_list_lock); 193 sysfs_remove_group(&zc->card->ap_dev.device.kobj, 194 &zcrypt_card_attr_group); 195 zcrypt_card_put(zc); 196 } 197 EXPORT_SYMBOL(zcrypt_card_unregister); 198