drivers/s390/crypto/ap_card.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2016
   4  * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   5  *
   6  * Adjunct processor bus, card related code.
   7  */
   8
   9 #define KMSG_COMPONENT "ap"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <asm/facility.h>
  15 #include <asm/sclp.h>
  16
  17 #include "ap_bus.h"
  18
  19 /*
  20  * AP card related attributes.
  21  */
  22 static ssize_t hwtype_show(struct device *dev,
  23                            struct device_attribute *attr, char *buf)
  24 {
  25         struct ap_card *ac = to_ap_card(dev);
  26
  27         return sysfs_emit(buf, "%d\n", ac->ap_dev.device_type);
  28 }
  29
  30 static DEVICE_ATTR_RO(hwtype);
  31
  32 static ssize_t raw_hwtype_show(struct device *dev,
  33                                struct device_attribute *attr, char *buf)
  34 {
  35         struct ap_card *ac = to_ap_card(dev);
  36
  37         return sysfs_emit(buf, "%d\n", ac->hwinfo.at);
  38 }
  39
  40 static DEVICE_ATTR_RO(raw_hwtype);
  41
  42 static ssize_t depth_show(struct device *dev, struct device_attribute *attr,
  43                           char *buf)
  44 {
  45         struct ap_card *ac = to_ap_card(dev);
  46
  47         return sysfs_emit(buf, "%d\n", ac->hwinfo.qd);
  48 }
  49
  50 static DEVICE_ATTR_RO(depth);
  51
  52 static ssize_t ap_functions_show(struct device *dev,
  53                                  struct device_attribute *attr, char *buf)
  54 {
  55         struct ap_card *ac = to_ap_card(dev);
  56
  57         return sysfs_emit(buf, "0x%08X\n", ac->hwinfo.fac);
  58 }
  59
  60 static DEVICE_ATTR_RO(ap_functions);
  61
  62 static ssize_t request_count_show(struct device *dev,
  63                                   struct device_attribute *attr,
  64                                   char *buf)
  65 {
  66         struct ap_card *ac = to_ap_card(dev);
  67         u64 req_cnt;
  68
  69         req_cnt = 0;
  70         spin_lock_bh(&ap_queues_lock);
  71         req_cnt = atomic64_read(&ac->total_request_count);
  72         spin_unlock_bh(&ap_queues_lock);
  73         return sysfs_emit(buf, "%llu\n", req_cnt);
  74 }
  75
  76 static ssize_t request_count_store(struct device *dev,
  77                                    struct device_attribute *attr,
  78                                    const char *buf, size_t count)
  79 {
  80         int bkt;
  81         struct ap_queue *aq;
  82         struct ap_card *ac = to_ap_card(dev);
  83
  84         spin_lock_bh(&ap_queues_lock);
  85         hash_for_each(ap_queues, bkt, aq, hnode)
  86                 if (ac == aq->card)
  87                         aq->total_request_count = 0;
  88         spin_unlock_bh(&ap_queues_lock);
  89         atomic64_set(&ac->total_request_count, 0);
  90
  91         return count;
  92 }
  93
  94 static DEVICE_ATTR_RW(request_count);
  95
  96 static ssize_t requestq_count_show(struct device *dev,
  97                                    struct device_attribute *attr, char *buf)
  98 {
  99         int bkt;
 100         struct ap_queue *aq;
 101         unsigned int reqq_cnt;
 102         struct ap_card *ac = to_ap_card(dev);
 103
 104         reqq_cnt = 0;
 105         spin_lock_bh(&ap_queues_lock);
 106         hash_for_each(ap_queues, bkt, aq, hnode)
 107                 if (ac == aq->card)
 108                         reqq_cnt += aq->requestq_count;
 109         spin_unlock_bh(&ap_queues_lock);
 110         return sysfs_emit(buf, "%d\n", reqq_cnt);
 111 }
 112
 113 static DEVICE_ATTR_RO(requestq_count);
 114
 115 static ssize_t pendingq_count_show(struct device *dev,
 116                                    struct device_attribute *attr, char *buf)
 117 {
 118         int bkt;
 119         struct ap_queue *aq;
 120         unsigned int penq_cnt;
 121         struct ap_card *ac = to_ap_card(dev);
 122
 123         penq_cnt = 0;
 124         spin_lock_bh(&ap_queues_lock);
 125         hash_for_each(ap_queues, bkt, aq, hnode)
 126                 if (ac == aq->card)
 127                         penq_cnt += aq->pendingq_count;
 128         spin_unlock_bh(&ap_queues_lock);
 129         return sysfs_emit(buf, "%d\n", penq_cnt);
 130 }
 131
 132 static DEVICE_ATTR_RO(pendingq_count);
 133
 134 static ssize_t modalias_show(struct device *dev,
 135                              struct device_attribute *attr, char *buf)
 136 {
 137         return sysfs_emit(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
 138 }
 139
 140 static DEVICE_ATTR_RO(modalias);
 141
 142 static ssize_t config_show(struct device *dev,
 143                            struct device_attribute *attr, char *buf)
 144 {
 145         struct ap_card *ac = to_ap_card(dev);
 146
 147         return sysfs_emit(buf, "%d\n", ac->config ? 1 : 0);
 148 }
 149
 150 static ssize_t config_store(struct device *dev,
 151                             struct device_attribute *attr,
 152                             const char *buf, size_t count)
 153 {
 154         int rc = 0, cfg;
 155         struct ap_card *ac = to_ap_card(dev);
 156
 157         if (sscanf(buf, "%d\n", &cfg) != 1 || cfg < 0 || cfg > 1)
 158                 return -EINVAL;
 159
 160         if (cfg && !ac->config)
 161                 rc = sclp_ap_configure(ac->id);
 162         else if (!cfg && ac->config)
 163                 rc = sclp_ap_deconfigure(ac->id);
 164         if (rc)
 165                 return rc;
 166
 167         ac->config = cfg ? true : false;
 168
 169         ap_send_config_uevent(&ac->ap_dev, ac->config);
 170
 171         return count;
 172 }
 173
 174 static DEVICE_ATTR_RW(config);
 175
 176 static ssize_t chkstop_show(struct device *dev,
 177                             struct device_attribute *attr, char *buf)
 178 {
 179         struct ap_card *ac = to_ap_card(dev);
 180
 181         return sysfs_emit(buf, "%d\n", ac->chkstop ? 1 : 0);
 182 }
 183
 184 static DEVICE_ATTR_RO(chkstop);
 185
 186 static ssize_t max_msg_size_show(struct device *dev,
 187                                  struct device_attribute *attr, char *buf)
 188 {
 189         struct ap_card *ac = to_ap_card(dev);
 190
 191         return sysfs_emit(buf, "%u\n", ac->maxmsgsize);
 192 }
 193
 194 static DEVICE_ATTR_RO(max_msg_size);
 195
 196 static struct attribute *ap_card_dev_attrs[] = {
 197         &dev_attr_hwtype.attr,
 198         &dev_attr_raw_hwtype.attr,
 199         &dev_attr_depth.attr,
 200         &dev_attr_ap_functions.attr,
 201         &dev_attr_request_count.attr,
 202         &dev_attr_requestq_count.attr,
 203         &dev_attr_pendingq_count.attr,
 204         &dev_attr_modalias.attr,
 205         &dev_attr_config.attr,
 206         &dev_attr_chkstop.attr,
 207         &dev_attr_max_msg_size.attr,
 208         NULL
 209 };
 210
 211 static struct attribute_group ap_card_dev_attr_group = {
 212         .attrs = ap_card_dev_attrs
 213 };
 214
 215 static const struct attribute_group *ap_card_dev_attr_groups[] = {
 216         &ap_card_dev_attr_group,
 217         NULL
 218 };
 219
 220 static struct device_type ap_card_type = {
 221         .name = "ap_card",
 222         .groups = ap_card_dev_attr_groups,
 223 };
 224
 225 static void ap_card_device_release(struct device *dev)
 226 {
 227         struct ap_card *ac = to_ap_card(dev);
 228
 229         kfree(ac);
 230 }
 231
 232 struct ap_card *ap_card_create(int id, struct ap_tapq_hwinfo hwinfo,
 233                                int comp_type)
 234 {
 235         struct ap_card *ac;
 236
 237         ac = kzalloc(sizeof(*ac), GFP_KERNEL);
 238         if (!ac)
 239                 return NULL;
 240         ac->ap_dev.device.release = ap_card_device_release;
 241         ac->ap_dev.device.type = &ap_card_type;
 242         ac->ap_dev.device_type = comp_type;
 243         ac->hwinfo = hwinfo;
 244         ac->id = id;
 245         ac->maxmsgsize = hwinfo.ml > 0 ?
 246                 hwinfo.ml * AP_TAPQ_ML_FIELD_CHUNK_SIZE : AP_DEFAULT_MAX_MSG_SIZE;
 247
 248         return ac;
 249 }