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
  16 #include "ap_bus.h"
  17 #include "ap_asm.h"
  18
  19 /*
  20  * AP card related attributes.
  21  */
  22 static ssize_t ap_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 snprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type);
  28 }
  29
  30 static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL);
  31
  32 static ssize_t ap_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 snprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
  38 }
  39
  40 static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_hwtype_show, NULL);
  41
  42 static ssize_t ap_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 snprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
  48 }
  49
  50 static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL);
  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 snprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
  58 }
  59
  60 static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL);
  61
  62 static ssize_t ap_req_count_show(struct device *dev,
  63                                  struct device_attribute *attr,
  64                                  char *buf)
  65 {
  66         struct ap_card *ac = to_ap_card(dev);
  67         unsigned int req_cnt;
  68
  69         req_cnt = 0;
  70         spin_lock_bh(&ap_list_lock);
  71         req_cnt = atomic_read(&ac->total_request_count);
  72         spin_unlock_bh(&ap_list_lock);
  73         return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt);
  74 }
  75
  76 static ssize_t ap_req_count_store(struct device *dev,
  77                                   struct device_attribute *attr,
  78                                   const char *buf, size_t count)
  79 {
  80         struct ap_card *ac = to_ap_card(dev);
  81         struct ap_queue *aq;
  82
  83         spin_lock_bh(&ap_list_lock);
  84         for_each_ap_queue(aq, ac)
  85                 aq->total_request_count = 0;
  86         spin_unlock_bh(&ap_list_lock);
  87         atomic_set(&ac->total_request_count, 0);
  88
  89         return count;
  90 }
  91
  92 static DEVICE_ATTR(request_count, 0644, ap_req_count_show, ap_req_count_store);
  93
  94 static ssize_t ap_requestq_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 reqq_cnt;
 100
 101         reqq_cnt = 0;
 102         spin_lock_bh(&ap_list_lock);
 103         for_each_ap_queue(aq, ac)
 104                 reqq_cnt += aq->requestq_count;
 105         spin_unlock_bh(&ap_list_lock);
 106         return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
 107 }
 108
 109 static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL);
 110
 111 static ssize_t ap_pendingq_count_show(struct device *dev,
 112                                       struct device_attribute *attr, char *buf)
 113 {
 114         struct ap_card *ac = to_ap_card(dev);
 115         struct ap_queue *aq;
 116         unsigned int penq_cnt;
 117
 118         penq_cnt = 0;
 119         spin_lock_bh(&ap_list_lock);
 120         for_each_ap_queue(aq, ac)
 121                 penq_cnt += aq->pendingq_count;
 122         spin_unlock_bh(&ap_list_lock);
 123         return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
 124 }
 125
 126 static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL);
 127
 128 static ssize_t ap_modalias_show(struct device *dev,
 129                                 struct device_attribute *attr, char *buf)
 130 {
 131         return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
 132 }
 133
 134 static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
 135
 136 static struct attribute *ap_card_dev_attrs[] = {
 137         &dev_attr_hwtype.attr,
 138         &dev_attr_raw_hwtype.attr,
 139         &dev_attr_depth.attr,
 140         &dev_attr_ap_functions.attr,
 141         &dev_attr_request_count.attr,
 142         &dev_attr_requestq_count.attr,
 143         &dev_attr_pendingq_count.attr,
 144         &dev_attr_modalias.attr,
 145         NULL
 146 };
 147
 148 static struct attribute_group ap_card_dev_attr_group = {
 149         .attrs = ap_card_dev_attrs
 150 };
 151
 152 static const struct attribute_group *ap_card_dev_attr_groups[] = {
 153         &ap_card_dev_attr_group,
 154         NULL
 155 };
 156
 157 static struct device_type ap_card_type = {
 158         .name = "ap_card",
 159         .groups = ap_card_dev_attr_groups,
 160 };
 161
 162 static void ap_card_device_release(struct device *dev)
 163 {
 164         struct ap_card *ac = to_ap_card(dev);
 165
 166         if (!list_empty(&ac->list)) {
 167                 spin_lock_bh(&ap_list_lock);
 168                 list_del_init(&ac->list);
 169                 spin_unlock_bh(&ap_list_lock);
 170         }
 171         kfree(ac);
 172 }
 173
 174 struct ap_card *ap_card_create(int id, int queue_depth, int device_type,
 175                                unsigned int functions)
 176 {
 177         struct ap_card *ac;
 178
 179         ac = kzalloc(sizeof(*ac), GFP_KERNEL);
 180         if (!ac)
 181                 return NULL;
 182         INIT_LIST_HEAD(&ac->queues);
 183         ac->ap_dev.device.release = ap_card_device_release;
 184         ac->ap_dev.device.type = &ap_card_type;
 185         ac->ap_dev.device_type = device_type;
 186         /* CEX6 toleration: map to CEX5 */
 187         if (device_type == AP_DEVICE_TYPE_CEX6)
 188                 ac->ap_dev.device_type = AP_DEVICE_TYPE_CEX5;
 189         ac->raw_hwtype = device_type;
 190         ac->queue_depth = queue_depth;
 191         ac->functions = functions;
 192         ac->id = id;
 193         return ac;
 194 }