drivers/s390/crypto/zcrypt_queue.c

   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 = dev_get_drvdata(dev);
  44         struct ap_queue *aq = to_ap_queue(dev);
  45         int online = aq->config && zq->online ? 1 : 0;
  46
  47         return scnprintf(buf, PAGE_SIZE, "%d\n", online);
  48 }
  49
  50 static ssize_t online_store(struct device *dev,
  51                             struct device_attribute *attr,
  52                             const char *buf, size_t count)
  53 {
  54         struct zcrypt_queue *zq = dev_get_drvdata(dev);
  55         struct ap_queue *aq = to_ap_queue(dev);
  56         struct zcrypt_card *zc = zq->zcard;
  57         int online;
  58
  59         if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
  60                 return -EINVAL;
  61
  62         if (online && (!aq->config || !aq->card->config))
  63                 return -ENODEV;
  64         if (online && !zc->online)
  65                 return -EINVAL;
  66         zq->online = online;
  67
  68         ZCRYPT_DBF_INFO("%s queue=%02x.%04x online=%d\n",
  69                         __func__, AP_QID_CARD(zq->queue->qid),
  70                         AP_QID_QUEUE(zq->queue->qid), online);
  71
  72         ap_send_online_uevent(&aq->ap_dev, online);
  73
  74         if (!online)
  75                 ap_flush_queue(zq->queue);
  76         return count;
  77 }
  78
  79 static DEVICE_ATTR_RW(online);
  80
  81 static ssize_t load_show(struct device *dev,
  82                          struct device_attribute *attr,
  83                          char *buf)
  84 {
  85         struct zcrypt_queue *zq = dev_get_drvdata(dev);
  86
  87         return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load));
  88 }
  89
  90 static DEVICE_ATTR_RO(load);
  91
  92 static struct attribute *zcrypt_queue_attrs[] = {
  93         &dev_attr_online.attr,
  94         &dev_attr_load.attr,
  95         NULL,
  96 };
  97
  98 static const struct attribute_group zcrypt_queue_attr_group = {
  99         .attrs = zcrypt_queue_attrs,
 100 };
 101
 102 bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
 103 {
 104         if (!!zq->online != !!online) {
 105                 zq->online = online;
 106                 if (!online)
 107                         ap_flush_queue(zq->queue);
 108                 return true;
 109         }
 110         return false;
 111 }
 112
 113 struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size)
 114 {
 115         struct zcrypt_queue *zq;
 116
 117         zq = kzalloc(sizeof(*zq), GFP_KERNEL);
 118         if (!zq)
 119                 return NULL;
 120         zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL);
 121         if (!zq->reply.msg)
 122                 goto out_free;
 123         zq->reply.bufsize = reply_buf_size;
 124         INIT_LIST_HEAD(&zq->list);
 125         kref_init(&zq->refcount);
 126         return zq;
 127
 128 out_free:
 129         kfree(zq);
 130         return NULL;
 131 }
 132 EXPORT_SYMBOL(zcrypt_queue_alloc);
 133
 134 void zcrypt_queue_free(struct zcrypt_queue *zq)
 135 {
 136         kfree(zq->reply.msg);
 137         kfree(zq);
 138 }
 139 EXPORT_SYMBOL(zcrypt_queue_free);
 140
 141 static void zcrypt_queue_release(struct kref *kref)
 142 {
 143         struct zcrypt_queue *zq =
 144                 container_of(kref, struct zcrypt_queue, refcount);
 145         zcrypt_queue_free(zq);
 146 }
 147
 148 void zcrypt_queue_get(struct zcrypt_queue *zq)
 149 {
 150         kref_get(&zq->refcount);
 151 }
 152 EXPORT_SYMBOL(zcrypt_queue_get);
 153
 154 int zcrypt_queue_put(struct zcrypt_queue *zq)
 155 {
 156         return kref_put(&zq->refcount, zcrypt_queue_release);
 157 }
 158 EXPORT_SYMBOL(zcrypt_queue_put);
 159
 160 /**
 161  * zcrypt_queue_register() - Register a crypto queue device.
 162  * @zq: Pointer to a crypto queue device
 163  *
 164  * Register a crypto queue device. Returns 0 if successful.
 165  */
 166 int zcrypt_queue_register(struct zcrypt_queue *zq)
 167 {
 168         struct zcrypt_card *zc;
 169         int rc;
 170
 171         spin_lock(&zcrypt_list_lock);
 172         zc = dev_get_drvdata(&zq->queue->card->ap_dev.device);
 173         zcrypt_card_get(zc);
 174         zq->zcard = zc;
 175         zq->online = 1; /* New devices are online by default. */
 176
 177         ZCRYPT_DBF_INFO("%s queue=%02x.%04x register online=1\n",
 178                         __func__, AP_QID_CARD(zq->queue->qid),
 179                         AP_QID_QUEUE(zq->queue->qid));
 180
 181         list_add_tail(&zq->list, &zc->zqueues);
 182         spin_unlock(&zcrypt_list_lock);
 183
 184         rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
 185                                 &zcrypt_queue_attr_group);
 186         if (rc)
 187                 goto out;
 188
 189         if (zq->ops->rng) {
 190                 rc = zcrypt_rng_device_add();
 191                 if (rc)
 192                         goto out_unregister;
 193         }
 194         return 0;
 195
 196 out_unregister:
 197         sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
 198                            &zcrypt_queue_attr_group);
 199 out:
 200         spin_lock(&zcrypt_list_lock);
 201         list_del_init(&zq->list);
 202         spin_unlock(&zcrypt_list_lock);
 203         zcrypt_card_put(zc);
 204         return rc;
 205 }
 206 EXPORT_SYMBOL(zcrypt_queue_register);
 207
 208 /**
 209  * zcrypt_queue_unregister(): Unregister a crypto queue device.
 210  * @zq: Pointer to crypto queue device
 211  *
 212  * Unregister a crypto queue device.
 213  */
 214 void zcrypt_queue_unregister(struct zcrypt_queue *zq)
 215 {
 216         struct zcrypt_card *zc;
 217
 218         ZCRYPT_DBF_INFO("%s queue=%02x.%04x unregister\n",
 219                         __func__, AP_QID_CARD(zq->queue->qid),
 220                         AP_QID_QUEUE(zq->queue->qid));
 221
 222         zc = zq->zcard;
 223         spin_lock(&zcrypt_list_lock);
 224         list_del_init(&zq->list);
 225         spin_unlock(&zcrypt_list_lock);
 226         if (zq->ops->rng)
 227                 zcrypt_rng_device_remove();
 228         sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
 229                            &zcrypt_queue_attr_group);
 230         zcrypt_card_put(zc);
 231         zcrypt_queue_put(zq);
 232 }
 233 EXPORT_SYMBOL(zcrypt_queue_unregister);