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