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 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 snprintf(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 snprintf(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 snprintf(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 snprintf(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 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 request_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_RW(request_count); 92 93 static ssize_t 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_RO(requestq_count); 109 110 static ssize_t 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_RO(pendingq_count); 126 127 static ssize_t 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_RO(modalias); 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 raw_type, 174 int comp_type, 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->list); 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 = 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 } 192