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