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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
  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 scnprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
  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 scnprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
  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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "ap:t%02X\n",
 138                          to_ap_dev(dev)->device_type);
 139 }
 140
 141 static DEVICE_ATTR_RO(modalias);
 142
 143 static ssize_t config_show(struct device *dev,
 144                            struct device_attribute *attr, char *buf)
 145 {
 146         struct ap_card *ac = to_ap_card(dev);
 147
 148         return scnprintf(buf, PAGE_SIZE, "%d\n", ac->config ? 1 : 0);
 149 }
 150
 151 static ssize_t config_store(struct device *dev,
 152                             struct device_attribute *attr,
 153                             const char *buf, size_t count)
 154 {
 155         int rc = 0, cfg;
 156         struct ap_card *ac = to_ap_card(dev);
 157
 158         if (sscanf(buf, "%d\n", &cfg) != 1 || cfg < 0 || cfg > 1)
 159                 return -EINVAL;
 160
 161         if (cfg && !ac->config)
 162                 rc = sclp_ap_configure(ac->id);
 163         else if (!cfg && ac->config)
 164                 rc = sclp_ap_deconfigure(ac->id);
 165         if (rc)
 166                 return rc;
 167
 168         ac->config = cfg ? true : false;
 169
 170         ap_send_config_uevent(&ac->ap_dev, ac->config);
 171
 172         return count;
 173 }
 174
 175 static DEVICE_ATTR_RW(config);
 176
 177 static ssize_t max_msg_size_show(struct device *dev,
 178                                  struct device_attribute *attr, char *buf)
 179 {
 180         struct ap_card *ac = to_ap_card(dev);
 181
 182         return scnprintf(buf, PAGE_SIZE, "%u\n", ac->maxmsgsize);
 183 }
 184
 185 static DEVICE_ATTR_RO(max_msg_size);
 186
 187 static struct attribute *ap_card_dev_attrs[] = {
 188         &dev_attr_hwtype.attr,
 189         &dev_attr_raw_hwtype.attr,
 190         &dev_attr_depth.attr,
 191         &dev_attr_ap_functions.attr,
 192         &dev_attr_request_count.attr,
 193         &dev_attr_requestq_count.attr,
 194         &dev_attr_pendingq_count.attr,
 195         &dev_attr_modalias.attr,
 196         &dev_attr_config.attr,
 197         &dev_attr_max_msg_size.attr,
 198         NULL
 199 };
 200
 201 static struct attribute_group ap_card_dev_attr_group = {
 202         .attrs = ap_card_dev_attrs
 203 };
 204
 205 static const struct attribute_group *ap_card_dev_attr_groups[] = {
 206         &ap_card_dev_attr_group,
 207         NULL
 208 };
 209
 210 static struct device_type ap_card_type = {
 211         .name = "ap_card",
 212         .groups = ap_card_dev_attr_groups,
 213 };
 214
 215 static void ap_card_device_release(struct device *dev)
 216 {
 217         struct ap_card *ac = to_ap_card(dev);
 218
 219         kfree(ac);
 220 }
 221
 222 struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
 223                                int comp_type, unsigned int functions, int ml)
 224 {
 225         struct ap_card *ac;
 226
 227         ac = kzalloc(sizeof(*ac), GFP_KERNEL);
 228         if (!ac)
 229                 return NULL;
 230         ac->ap_dev.device.release = ap_card_device_release;
 231         ac->ap_dev.device.type = &ap_card_type;
 232         ac->ap_dev.device_type = comp_type;
 233         ac->raw_hwtype = raw_type;
 234         ac->queue_depth = queue_depth;
 235         ac->functions = functions;
 236         ac->id = id;
 237         ac->maxmsgsize = ml > 0 ?
 238                 ml * AP_TAPQ_ML_FIELD_CHUNK_SIZE : AP_DEFAULT_MAX_MSG_SIZE;
 239
 240         return ac;
 241 }