drivers/s390/crypto/ap_card.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2016
   4  * Author(s): Martin Schwidefsky <[email protected]>
   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
  18 /*
  19  * AP card related attributes.
  20  */
  21 static ssize_t 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 scnprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type);
  27 }
  28
  29 static DEVICE_ATTR_RO(hwtype);
  30
  31 static ssize_t 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 scnprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
  37 }
  38
  39 static DEVICE_ATTR_RO(raw_hwtype);
  40
  41 static ssize_t 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 scnprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
  47 }
  48
  49 static DEVICE_ATTR_RO(depth);
  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 scnprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
  57 }
  58
  59 static DEVICE_ATTR_RO(ap_functions);
  60
  61 static ssize_t 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         u64 req_cnt;
  67
  68         req_cnt = 0;
  69         spin_lock_bh(&ap_queues_lock);
  70         req_cnt = atomic64_read(&ac->total_request_count);
  71         spin_unlock_bh(&ap_queues_lock);
  72         return scnprintf(buf, PAGE_SIZE, "%llu\n", req_cnt);
  73 }
  74
  75 static ssize_t request_count_store(struct device *dev,
  76                                    struct device_attribute *attr,
  77                                    const char *buf, size_t count)
  78 {
  79         int bkt;
  80         struct ap_queue *aq;
  81         struct ap_card *ac = to_ap_card(dev);
  82
  83         spin_lock_bh(&ap_queues_lock);
  84         hash_for_each(ap_queues, bkt, aq, hnode)
  85                 if (ac == aq->card)
  86                         aq->total_request_count = 0;
  87         spin_unlock_bh(&ap_queues_lock);
  88         atomic64_set(&ac->total_request_count, 0);
  89
  90         return count;
  91 }
  92
  93 static DEVICE_ATTR_RW(request_count);
  94
  95 static ssize_t requestq_count_show(struct device *dev,
  96                                    struct device_attribute *attr, char *buf)
  97 {
  98         int bkt;
  99         struct ap_queue *aq;
 100         unsigned int reqq_cnt;
 101         struct ap_card *ac = to_ap_card(dev);
 102
 103         reqq_cnt = 0;
 104         spin_lock_bh(&ap_queues_lock);
 105         hash_for_each(ap_queues, bkt, aq, hnode)
 106                 if (ac == aq->card)
 107                         reqq_cnt += aq->requestq_count;
 108         spin_unlock_bh(&ap_queues_lock);
 109         return scnprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
 110 }
 111
 112 static DEVICE_ATTR_RO(requestq_count);
 113
 114 static ssize_t pendingq_count_show(struct device *dev,
 115                                    struct device_attribute *attr, char *buf)
 116 {
 117         int bkt;
 118         struct ap_queue *aq;
 119         unsigned int penq_cnt;
 120         struct ap_card *ac = to_ap_card(dev);
 121
 122         penq_cnt = 0;
 123         spin_lock_bh(&ap_queues_lock);
 124         hash_for_each(ap_queues, bkt, aq, hnode)
 125                 if (ac == aq->card)
 126                         penq_cnt += aq->pendingq_count;
 127         spin_unlock_bh(&ap_queues_lock);
 128         return scnprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
 129 }
 130
 131 static DEVICE_ATTR_RO(pendingq_count);
 132
 133 static ssize_t modalias_show(struct device *dev,
 134                              struct device_attribute *attr, char *buf)
 135 {
 136         return scnprintf(buf, PAGE_SIZE, "ap:t%02X\n",
 137                          to_ap_dev(dev)->device_type);
 138 }
 139
 140 static DEVICE_ATTR_RO(modalias);
 141
 142 static struct attribute *ap_card_dev_attrs[] = {
 143         &dev_attr_hwtype.attr,
 144         &dev_attr_raw_hwtype.attr,
 145         &dev_attr_depth.attr,
 146         &dev_attr_ap_functions.attr,
 147         &dev_attr_request_count.attr,
 148         &dev_attr_requestq_count.attr,
 149         &dev_attr_pendingq_count.attr,
 150         &dev_attr_modalias.attr,
 151         NULL
 152 };
 153
 154 static struct attribute_group ap_card_dev_attr_group = {
 155         .attrs = ap_card_dev_attrs
 156 };
 157
 158 static const struct attribute_group *ap_card_dev_attr_groups[] = {
 159         &ap_card_dev_attr_group,
 160         NULL
 161 };
 162
 163 static struct device_type ap_card_type = {
 164         .name = "ap_card",
 165         .groups = ap_card_dev_attr_groups,
 166 };
 167
 168 static void ap_card_device_release(struct device *dev)
 169 {
 170         struct ap_card *ac = to_ap_card(dev);
 171
 172         kfree(ac);
 173 }
 174
 175 struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
 176                                int comp_type, unsigned int functions)
 177 {
 178         struct ap_card *ac;
 179
 180         ac = kzalloc(sizeof(*ac), GFP_KERNEL);
 181         if (!ac)
 182                 return NULL;
 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 = comp_type;
 186         ac->raw_hwtype = raw_type;
 187         ac->queue_depth = queue_depth;
 188         ac->functions = functions;
 189         ac->id = id;
 190         return ac;
 191 }