drivers/s390/crypto/ap_card.c

   1 /*
   2  * Copyright IBM Corp. 2016
   3  * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   4  *
   5  * Adjunct processor bus, card related code.
   6  */
   7
   8 #define KMSG_COMPONENT "ap"
   9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <asm/facility.h>
  14
  15 #include "ap_bus.h"
  16 #include "ap_asm.h"
  17
  18 /*
  19  * AP card related attributes.
  20  */
  21 static ssize_t ap_hwtype_show(struct device *dev,
  22                               struct device_attribute *attr, char *buf)
  23 {
  24         struct ap_card *ac = to_ap_card(dev);
  25
  26         return snprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type);
  27 }
  28
  29 static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL);
  30
  31 static ssize_t ap_raw_hwtype_show(struct device *dev,
  32                                   struct device_attribute *attr, char *buf)
  33 {
  34         struct ap_card *ac = to_ap_card(dev);
  35
  36         return snprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
  37 }
  38
  39 static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_hwtype_show, NULL);
  40
  41 static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr,
  42                              char *buf)
  43 {
  44         struct ap_card *ac = to_ap_card(dev);
  45
  46         return snprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
  47 }
  48
  49 static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL);
  50
  51 static ssize_t ap_functions_show(struct device *dev,
  52                                  struct device_attribute *attr, char *buf)
  53 {
  54         struct ap_card *ac = to_ap_card(dev);
  55
  56         return snprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
  57 }
  58
  59 static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL);
  60
  61 static ssize_t ap_req_count_show(struct device *dev,
  62                                  struct device_attribute *attr,
  63                                  char *buf)
  64 {
  65         struct ap_card *ac = to_ap_card(dev);
  66         unsigned int req_cnt;
  67
  68         req_cnt = 0;
  69         spin_lock_bh(&ap_list_lock);
  70         req_cnt = atomic_read(&ac->total_request_count);
  71         spin_unlock_bh(&ap_list_lock);
  72         return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt);
  73 }
  74
  75 static ssize_t ap_req_count_store(struct device *dev,
  76                                   struct device_attribute *attr,
  77                                   const char *buf, size_t count)
  78 {
  79         struct ap_card *ac = to_ap_card(dev);
  80         struct ap_queue *aq;
  81
  82         spin_lock_bh(&ap_list_lock);
  83         for_each_ap_queue(aq, ac)
  84                 aq->total_request_count = 0;
  85         spin_unlock_bh(&ap_list_lock);
  86         atomic_set(&ac->total_request_count, 0);
  87
  88         return count;
  89 }
  90
  91 static DEVICE_ATTR(request_count, 0644, ap_req_count_show, ap_req_count_store);
  92
  93 static ssize_t ap_requestq_count_show(struct device *dev,
  94                                       struct device_attribute *attr, char *buf)
  95 {
  96         struct ap_card *ac = to_ap_card(dev);
  97         struct ap_queue *aq;
  98         unsigned int reqq_cnt;
  99
 100         reqq_cnt = 0;
 101         spin_lock_bh(&ap_list_lock);
 102         for_each_ap_queue(aq, ac)
 103                 reqq_cnt += aq->requestq_count;
 104         spin_unlock_bh(&ap_list_lock);
 105         return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
 106 }
 107
 108 static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL);
 109
 110 static ssize_t ap_pendingq_count_show(struct device *dev,
 111                                       struct device_attribute *attr, char *buf)
 112 {
 113         struct ap_card *ac = to_ap_card(dev);
 114         struct ap_queue *aq;
 115         unsigned int penq_cnt;
 116
 117         penq_cnt = 0;
 118         spin_lock_bh(&ap_list_lock);
 119         for_each_ap_queue(aq, ac)
 120                 penq_cnt += aq->pendingq_count;
 121         spin_unlock_bh(&ap_list_lock);
 122         return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
 123 }
 124
 125 static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL);
 126
 127 static ssize_t ap_modalias_show(struct device *dev,
 128                                 struct device_attribute *attr, char *buf)
 129 {
 130         return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
 131 }
 132
 133 static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
 134
 135 static struct attribute *ap_card_dev_attrs[] = {
 136         &dev_attr_hwtype.attr,
 137         &dev_attr_raw_hwtype.attr,
 138         &dev_attr_depth.attr,
 139         &dev_attr_ap_functions.attr,
 140         &dev_attr_request_count.attr,
 141         &dev_attr_requestq_count.attr,
 142         &dev_attr_pendingq_count.attr,
 143         &dev_attr_modalias.attr,
 144         NULL
 145 };
 146
 147 static struct attribute_group ap_card_dev_attr_group = {
 148         .attrs = ap_card_dev_attrs
 149 };
 150
 151 static const struct attribute_group *ap_card_dev_attr_groups[] = {
 152         &ap_card_dev_attr_group,
 153         NULL
 154 };
 155
 156 static struct device_type ap_card_type = {
 157         .name = "ap_card",
 158         .groups = ap_card_dev_attr_groups,
 159 };
 160
 161 static void ap_card_device_release(struct device *dev)
 162 {
 163         struct ap_card *ac = to_ap_card(dev);
 164
 165         if (!list_empty(&ac->list)) {
 166                 spin_lock_bh(&ap_list_lock);
 167                 list_del_init(&ac->list);
 168                 spin_unlock_bh(&ap_list_lock);
 169         }
 170         kfree(ac);
 171 }
 172
 173 struct ap_card *ap_card_create(int id, int queue_depth, int device_type,
 174                                unsigned int functions)
 175 {
 176         struct ap_card *ac;
 177
 178         ac = kzalloc(sizeof(*ac), GFP_KERNEL);
 179         if (!ac)
 180                 return NULL;
 181         INIT_LIST_HEAD(&ac->queues);
 182         ac->ap_dev.device.release = ap_card_device_release;
 183         ac->ap_dev.device.type = &ap_card_type;
 184         ac->ap_dev.device_type = device_type;
 185         /* CEX6 toleration: map to CEX5 */
 186         if (device_type == AP_DEVICE_TYPE_CEX6)
 187                 ac->ap_dev.device_type = AP_DEVICE_TYPE_CEX5;
 188         ac->raw_hwtype = device_type;
 189         ac->queue_depth = queue_depth;
 190         ac->functions = functions;
 191         ac->id = id;
 192         return ac;
 193 }