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_request_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 DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL);
  76
  77 static ssize_t ap_requestq_count_show(struct device *dev,
  78                                       struct device_attribute *attr, char *buf)
  79 {
  80         struct ap_card *ac = to_ap_card(dev);
  81         struct ap_queue *aq;
  82         unsigned int reqq_cnt;
  83
  84         reqq_cnt = 0;
  85         spin_lock_bh(&ap_list_lock);
  86         for_each_ap_queue(aq, ac)
  87                 reqq_cnt += aq->requestq_count;
  88         spin_unlock_bh(&ap_list_lock);
  89         return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
  90 }
  91
  92 static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL);
  93
  94 static ssize_t ap_pendingq_count_show(struct device *dev,
  95                                       struct device_attribute *attr, char *buf)
  96 {
  97         struct ap_card *ac = to_ap_card(dev);
  98         struct ap_queue *aq;
  99         unsigned int penq_cnt;
 100
 101         penq_cnt = 0;
 102         spin_lock_bh(&ap_list_lock);
 103         for_each_ap_queue(aq, ac)
 104                 penq_cnt += aq->pendingq_count;
 105         spin_unlock_bh(&ap_list_lock);
 106         return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
 107 }
 108
 109 static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL);
 110
 111 static ssize_t ap_modalias_show(struct device *dev,
 112                                 struct device_attribute *attr, char *buf)
 113 {
 114         return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
 115 }
 116
 117 static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
 118
 119 static struct attribute *ap_card_dev_attrs[] = {
 120         &dev_attr_hwtype.attr,
 121         &dev_attr_raw_hwtype.attr,
 122         &dev_attr_depth.attr,
 123         &dev_attr_ap_functions.attr,
 124         &dev_attr_request_count.attr,
 125         &dev_attr_requestq_count.attr,
 126         &dev_attr_pendingq_count.attr,
 127         &dev_attr_modalias.attr,
 128         NULL
 129 };
 130
 131 static struct attribute_group ap_card_dev_attr_group = {
 132         .attrs = ap_card_dev_attrs
 133 };
 134
 135 static const struct attribute_group *ap_card_dev_attr_groups[] = {
 136         &ap_card_dev_attr_group,
 137         NULL
 138 };
 139
 140 struct device_type ap_card_type = {
 141         .name = "ap_card",
 142         .groups = ap_card_dev_attr_groups,
 143 };
 144
 145 static void ap_card_device_release(struct device *dev)
 146 {
 147         kfree(to_ap_card(dev));
 148 }
 149
 150 struct ap_card *ap_card_create(int id, int queue_depth, int device_type,
 151                                unsigned int functions)
 152 {
 153         struct ap_card *ac;
 154
 155         ac = kzalloc(sizeof(*ac), GFP_KERNEL);
 156         if (!ac)
 157                 return NULL;
 158         INIT_LIST_HEAD(&ac->queues);
 159         ac->ap_dev.device.release = ap_card_device_release;
 160         ac->ap_dev.device.type = &ap_card_type;
 161         ac->ap_dev.device_type = device_type;
 162         /* CEX6 toleration: map to CEX5 */
 163         if (device_type == AP_DEVICE_TYPE_CEX6)
 164                 ac->ap_dev.device_type = AP_DEVICE_TYPE_CEX5;
 165         ac->raw_hwtype = device_type;
 166         ac->queue_depth = queue_depth;
 167         ac->functions = functions;
 168         ac->id = id;
 169         return ac;
 170 }