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 #include <asm/sclp.h> 16 17 #include "ap_bus.h" 18 19 /* 20 * AP card related attributes. 21 */ 22 static ssize_t 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 scnprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type); 28 } 29 30 static DEVICE_ATTR_RO(hwtype); 31 32 static ssize_t 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 scnprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype); 38 } 39 40 static DEVICE_ATTR_RO(raw_hwtype); 41 42 static ssize_t 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 scnprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth); 48 } 49 50 static DEVICE_ATTR_RO(depth); 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 scnprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions); 58 } 59 60 static DEVICE_ATTR_RO(ap_functions); 61 62 static ssize_t request_count_show(struct device *dev, 63 struct device_attribute *attr, 64 char *buf) 65 { 66 struct ap_card *ac = to_ap_card(dev); 67 u64 req_cnt; 68 69 req_cnt = 0; 70 spin_lock_bh(&ap_queues_lock); 71 req_cnt = atomic64_read(&ac->total_request_count); 72 spin_unlock_bh(&ap_queues_lock); 73 return scnprintf(buf, PAGE_SIZE, "%llu\n", req_cnt); 74 } 75 76 static ssize_t request_count_store(struct device *dev, 77 struct device_attribute *attr, 78 const char *buf, size_t count) 79 { 80 int bkt; 81 struct ap_queue *aq; 82 struct ap_card *ac = to_ap_card(dev); 83 84 spin_lock_bh(&ap_queues_lock); 85 hash_for_each(ap_queues, bkt, aq, hnode) 86 if (ac == aq->card) 87 aq->total_request_count = 0; 88 spin_unlock_bh(&ap_queues_lock); 89 atomic64_set(&ac->total_request_count, 0); 90 91 return count; 92 } 93 94 static DEVICE_ATTR_RW(request_count); 95 96 static ssize_t requestq_count_show(struct device *dev, 97 struct device_attribute *attr, char *buf) 98 { 99 int bkt; 100 struct ap_queue *aq; 101 unsigned int reqq_cnt; 102 struct ap_card *ac = to_ap_card(dev); 103 104 reqq_cnt = 0; 105 spin_lock_bh(&ap_queues_lock); 106 hash_for_each(ap_queues, bkt, aq, hnode) 107 if (ac == aq->card) 108 reqq_cnt += aq->requestq_count; 109 spin_unlock_bh(&ap_queues_lock); 110 return scnprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt); 111 } 112 113 static DEVICE_ATTR_RO(requestq_count); 114 115 static ssize_t pendingq_count_show(struct device *dev, 116 struct device_attribute *attr, char *buf) 117 { 118 int bkt; 119 struct ap_queue *aq; 120 unsigned int penq_cnt; 121 struct ap_card *ac = to_ap_card(dev); 122 123 penq_cnt = 0; 124 spin_lock_bh(&ap_queues_lock); 125 hash_for_each(ap_queues, bkt, aq, hnode) 126 if (ac == aq->card) 127 penq_cnt += aq->pendingq_count; 128 spin_unlock_bh(&ap_queues_lock); 129 return scnprintf(buf, PAGE_SIZE, "%d\n", penq_cnt); 130 } 131 132 static DEVICE_ATTR_RO(pendingq_count); 133 134 static ssize_t modalias_show(struct device *dev, 135 struct device_attribute *attr, char *buf) 136 { 137 return scnprintf(buf, PAGE_SIZE, "ap:t%02X\n", 138 to_ap_dev(dev)->device_type); 139 } 140 141 static DEVICE_ATTR_RO(modalias); 142 143 static ssize_t config_show(struct device *dev, 144 struct device_attribute *attr, char *buf) 145 { 146 struct ap_card *ac = to_ap_card(dev); 147 148 return scnprintf(buf, PAGE_SIZE, "%d\n", ac->config ? 1 : 0); 149 } 150 151 static ssize_t config_store(struct device *dev, 152 struct device_attribute *attr, 153 const char *buf, size_t count) 154 { 155 int rc = 0, cfg; 156 struct ap_card *ac = to_ap_card(dev); 157 158 if (sscanf(buf, "%d\n", &cfg) != 1 || cfg < 0 || cfg > 1) 159 return -EINVAL; 160 161 if (cfg && !ac->config) 162 rc = sclp_ap_configure(ac->id); 163 else if (!cfg && ac->config) 164 rc = sclp_ap_deconfigure(ac->id); 165 if (rc) 166 return rc; 167 168 ac->config = cfg ? true : false; 169 170 return count; 171 } 172 173 static DEVICE_ATTR_RW(config); 174 175 static struct attribute *ap_card_dev_attrs[] = { 176 &dev_attr_hwtype.attr, 177 &dev_attr_raw_hwtype.attr, 178 &dev_attr_depth.attr, 179 &dev_attr_ap_functions.attr, 180 &dev_attr_request_count.attr, 181 &dev_attr_requestq_count.attr, 182 &dev_attr_pendingq_count.attr, 183 &dev_attr_modalias.attr, 184 &dev_attr_config.attr, 185 NULL 186 }; 187 188 static struct attribute_group ap_card_dev_attr_group = { 189 .attrs = ap_card_dev_attrs 190 }; 191 192 static const struct attribute_group *ap_card_dev_attr_groups[] = { 193 &ap_card_dev_attr_group, 194 NULL 195 }; 196 197 static struct device_type ap_card_type = { 198 .name = "ap_card", 199 .groups = ap_card_dev_attr_groups, 200 }; 201 202 static void ap_card_device_release(struct device *dev) 203 { 204 struct ap_card *ac = to_ap_card(dev); 205 206 kfree(ac); 207 } 208 209 struct ap_card *ap_card_create(int id, int queue_depth, int raw_type, 210 int comp_type, unsigned int functions) 211 { 212 struct ap_card *ac; 213 214 ac = kzalloc(sizeof(*ac), GFP_KERNEL); 215 if (!ac) 216 return NULL; 217 ac->ap_dev.device.release = ap_card_device_release; 218 ac->ap_dev.device.type = &ap_card_type; 219 ac->ap_dev.device_type = comp_type; 220 ac->raw_hwtype = raw_type; 221 ac->queue_depth = queue_depth; 222 ac->functions = functions; 223 ac->id = id; 224 return ac; 225 } 226