1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright IBM Corp. 2006, 2019 4 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 5 * Martin Schwidefsky <schwidefsky@de.ibm.com> 6 * Ralph Wuerthner <rwuerthn@de.ibm.com> 7 * Felix Beck <felix.beck@de.ibm.com> 8 * Holger Dengler <hd@linux.vnet.ibm.com> 9 * 10 * Adjunct processor bus header file. 11 */ 12 13 #ifndef _AP_BUS_H_ 14 #define _AP_BUS_H_ 15 16 #include <linux/device.h> 17 #include <linux/types.h> 18 #include <asm/isc.h> 19 #include <asm/ap.h> 20 21 #define AP_DEVICES 256 /* Number of AP devices. */ 22 #define AP_DOMAINS 256 /* Number of AP domains. */ 23 #define AP_IOCTLS 256 /* Number of ioctls. */ 24 #define AP_RESET_TIMEOUT (HZ*0.7) /* Time in ticks for reset timeouts. */ 25 #define AP_CONFIG_TIME 30 /* Time in seconds between AP bus rescans. */ 26 #define AP_POLL_TIME 1 /* Time in ticks between receive polls. */ 27 28 extern int ap_domain_index; 29 30 extern spinlock_t ap_list_lock; 31 extern struct list_head ap_card_list; 32 33 static inline int ap_test_bit(unsigned int *ptr, unsigned int nr) 34 { 35 return (*ptr & (0x80000000u >> nr)) != 0; 36 } 37 38 #define AP_RESPONSE_NORMAL 0x00 39 #define AP_RESPONSE_Q_NOT_AVAIL 0x01 40 #define AP_RESPONSE_RESET_IN_PROGRESS 0x02 41 #define AP_RESPONSE_DECONFIGURED 0x03 42 #define AP_RESPONSE_CHECKSTOPPED 0x04 43 #define AP_RESPONSE_BUSY 0x05 44 #define AP_RESPONSE_INVALID_ADDRESS 0x06 45 #define AP_RESPONSE_OTHERWISE_CHANGED 0x07 46 #define AP_RESPONSE_Q_FULL 0x10 47 #define AP_RESPONSE_NO_PENDING_REPLY 0x10 48 #define AP_RESPONSE_INDEX_TOO_BIG 0x11 49 #define AP_RESPONSE_NO_FIRST_PART 0x13 50 #define AP_RESPONSE_MESSAGE_TOO_BIG 0x15 51 #define AP_RESPONSE_REQ_FAC_NOT_INST 0x16 52 53 /* 54 * Known device types 55 */ 56 #define AP_DEVICE_TYPE_PCICC 3 57 #define AP_DEVICE_TYPE_PCICA 4 58 #define AP_DEVICE_TYPE_PCIXCC 5 59 #define AP_DEVICE_TYPE_CEX2A 6 60 #define AP_DEVICE_TYPE_CEX2C 7 61 #define AP_DEVICE_TYPE_CEX3A 8 62 #define AP_DEVICE_TYPE_CEX3C 9 63 #define AP_DEVICE_TYPE_CEX4 10 64 #define AP_DEVICE_TYPE_CEX5 11 65 #define AP_DEVICE_TYPE_CEX6 12 66 #define AP_DEVICE_TYPE_CEX7 13 67 68 /* 69 * Known function facilities 70 */ 71 #define AP_FUNC_MEX4K 1 72 #define AP_FUNC_CRT4K 2 73 #define AP_FUNC_COPRO 3 74 #define AP_FUNC_ACCEL 4 75 #define AP_FUNC_EP11 5 76 #define AP_FUNC_APXA 6 77 78 /* 79 * AP interrupt states 80 */ 81 #define AP_INTR_DISABLED 0 /* AP interrupt disabled */ 82 #define AP_INTR_ENABLED 1 /* AP interrupt enabled */ 83 84 /* 85 * AP device states 86 */ 87 enum ap_state { 88 AP_STATE_RESET_START, 89 AP_STATE_RESET_WAIT, 90 AP_STATE_SETIRQ_WAIT, 91 AP_STATE_IDLE, 92 AP_STATE_WORKING, 93 AP_STATE_QUEUE_FULL, 94 AP_STATE_SUSPEND_WAIT, 95 AP_STATE_REMOVE, /* about to be removed from driver */ 96 AP_STATE_UNBOUND, /* momentary not bound to a driver */ 97 AP_STATE_BORKED, /* broken */ 98 NR_AP_STATES 99 }; 100 101 /* 102 * AP device events 103 */ 104 enum ap_event { 105 AP_EVENT_POLL, 106 AP_EVENT_TIMEOUT, 107 NR_AP_EVENTS 108 }; 109 110 /* 111 * AP wait behaviour 112 */ 113 enum ap_wait { 114 AP_WAIT_AGAIN, /* retry immediately */ 115 AP_WAIT_TIMEOUT, /* wait for timeout */ 116 AP_WAIT_INTERRUPT, /* wait for thin interrupt (if available) */ 117 AP_WAIT_NONE, /* no wait */ 118 NR_AP_WAIT 119 }; 120 121 struct ap_device; 122 struct ap_message; 123 124 /* 125 * The ap driver struct includes a flags field which holds some info for 126 * the ap bus about the driver. Currently only one flag is supported and 127 * used: The DEFAULT flag marks an ap driver as a default driver which is 128 * used together with the apmask and aqmask whitelisting of the ap bus. 129 */ 130 #define AP_DRIVER_FLAG_DEFAULT 0x0001 131 132 struct ap_driver { 133 struct device_driver driver; 134 struct ap_device_id *ids; 135 unsigned int flags; 136 137 int (*probe)(struct ap_device *); 138 void (*remove)(struct ap_device *); 139 void (*suspend)(struct ap_device *); 140 void (*resume)(struct ap_device *); 141 }; 142 143 #define to_ap_drv(x) container_of((x), struct ap_driver, driver) 144 145 int ap_driver_register(struct ap_driver *, struct module *, char *); 146 void ap_driver_unregister(struct ap_driver *); 147 148 struct ap_device { 149 struct device device; 150 struct ap_driver *drv; /* Pointer to AP device driver. */ 151 int device_type; /* AP device type. */ 152 }; 153 154 #define to_ap_dev(x) container_of((x), struct ap_device, device) 155 156 struct ap_card { 157 struct ap_device ap_dev; 158 struct list_head list; /* Private list of AP cards. */ 159 struct list_head queues; /* List of assoc. AP queues */ 160 void *private; /* ap driver private pointer. */ 161 int raw_hwtype; /* AP raw hardware type. */ 162 unsigned int functions; /* AP device function bitfield. */ 163 int queue_depth; /* AP queue depth.*/ 164 int id; /* AP card number. */ 165 atomic64_t total_request_count; /* # requests ever for this AP device.*/ 166 }; 167 168 #define to_ap_card(x) container_of((x), struct ap_card, ap_dev.device) 169 170 struct ap_queue { 171 struct ap_device ap_dev; 172 struct list_head list; /* Private list of AP queues. */ 173 struct ap_card *card; /* Ptr to assoc. AP card. */ 174 spinlock_t lock; /* Per device lock. */ 175 void *private; /* ap driver private pointer. */ 176 ap_qid_t qid; /* AP queue id. */ 177 int interrupt; /* indicate if interrupts are enabled */ 178 int queue_count; /* # messages currently on AP queue. */ 179 enum ap_state state; /* State of the AP device. */ 180 int pendingq_count; /* # requests on pendingq list. */ 181 int requestq_count; /* # requests on requestq list. */ 182 u64 total_request_count; /* # requests ever for this AP device.*/ 183 int request_timeout; /* Request timeout in jiffies. */ 184 struct timer_list timeout; /* Timer for request timeouts. */ 185 struct list_head pendingq; /* List of message sent to AP queue. */ 186 struct list_head requestq; /* List of message yet to be sent. */ 187 struct ap_message *reply; /* Per device reply message. */ 188 }; 189 190 #define to_ap_queue(x) container_of((x), struct ap_queue, ap_dev.device) 191 192 typedef enum ap_wait (ap_func_t)(struct ap_queue *queue); 193 194 struct ap_message { 195 struct list_head list; /* Request queueing. */ 196 unsigned long long psmid; /* Message id. */ 197 void *message; /* Pointer to message buffer. */ 198 size_t length; /* Message length. */ 199 int rc; /* Return code for this message */ 200 201 void *private; /* ap driver private pointer. */ 202 unsigned int special:1; /* Used for special commands. */ 203 /* receive is called from tasklet context */ 204 void (*receive)(struct ap_queue *, struct ap_message *, 205 struct ap_message *); 206 }; 207 208 /** 209 * ap_init_message() - Initialize ap_message. 210 * Initialize a message before using. Otherwise this might result in 211 * unexpected behaviour. 212 */ 213 static inline void ap_init_message(struct ap_message *ap_msg) 214 { 215 memset(ap_msg, 0, sizeof(*ap_msg)); 216 } 217 218 /** 219 * ap_release_message() - Release ap_message. 220 * Releases all memory used internal within the ap_message struct 221 * Currently this is the message and private field. 222 */ 223 static inline void ap_release_message(struct ap_message *ap_msg) 224 { 225 kzfree(ap_msg->message); 226 kzfree(ap_msg->private); 227 } 228 229 #define for_each_ap_card(_ac) \ 230 list_for_each_entry(_ac, &ap_card_list, list) 231 232 #define for_each_ap_queue(_aq, _ac) \ 233 list_for_each_entry(_aq, &(_ac)->queues, list) 234 235 /* 236 * Note: don't use ap_send/ap_recv after using ap_queue_message 237 * for the first time. Otherwise the ap message queue will get 238 * confused. 239 */ 240 int ap_send(ap_qid_t, unsigned long long, void *, size_t); 241 int ap_recv(ap_qid_t, unsigned long long *, void *, size_t); 242 243 enum ap_wait ap_sm_event(struct ap_queue *aq, enum ap_event event); 244 enum ap_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_event event); 245 246 void ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg); 247 void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg); 248 void ap_flush_queue(struct ap_queue *aq); 249 250 void *ap_airq_ptr(void); 251 void ap_wait(enum ap_wait wait); 252 void ap_request_timeout(struct timer_list *t); 253 void ap_bus_force_rescan(void); 254 255 int ap_test_config_usage_domain(unsigned int domain); 256 int ap_test_config_ctrl_domain(unsigned int domain); 257 258 void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *ap_msg); 259 struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type); 260 void ap_queue_prepare_remove(struct ap_queue *aq); 261 void ap_queue_remove(struct ap_queue *aq); 262 void ap_queue_suspend(struct ap_device *ap_dev); 263 void ap_queue_resume(struct ap_device *ap_dev); 264 void ap_queue_init_state(struct ap_queue *aq); 265 266 struct ap_card *ap_card_create(int id, int queue_depth, int raw_device_type, 267 int comp_device_type, unsigned int functions); 268 269 struct ap_perms { 270 unsigned long ioctlm[BITS_TO_LONGS(AP_IOCTLS)]; 271 unsigned long apm[BITS_TO_LONGS(AP_DEVICES)]; 272 unsigned long aqm[BITS_TO_LONGS(AP_DOMAINS)]; 273 }; 274 extern struct ap_perms ap_perms; 275 extern struct mutex ap_perms_mutex; 276 277 /* 278 * check APQN for owned/reserved by ap bus and default driver(s). 279 * Checks if this APQN is or will be in use by the ap bus 280 * and the default set of drivers. 281 * If yes, returns 1, if not returns 0. On error a negative 282 * errno value is returned. 283 */ 284 int ap_owned_by_def_drv(int card, int queue); 285 286 /* 287 * check 'matrix' of APQNs for owned/reserved by ap bus and 288 * default driver(s). 289 * Checks if there is at least one APQN in the given 'matrix' 290 * marked as owned/reserved by the ap bus and default driver(s). 291 * If such an APQN is found the return value is 1, otherwise 292 * 0 is returned. On error a negative errno value is returned. 293 * The parameter apm is a bitmask which should be declared 294 * as DECLARE_BITMAP(apm, AP_DEVICES), the aqm parameter is 295 * similar, should be declared as DECLARE_BITMAP(aqm, AP_DOMAINS). 296 */ 297 int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm, 298 unsigned long *aqm); 299 300 /* 301 * ap_parse_mask_str() - helper function to parse a bitmap string 302 * and clear/set the bits in the bitmap accordingly. The string may be 303 * given as absolute value, a hex string like 0x1F2E3D4C5B6A" simple 304 * overwriting the current content of the bitmap. Or as relative string 305 * like "+1-16,-32,-0x40,+128" where only single bits or ranges of 306 * bits are cleared or set. Distinction is done based on the very 307 * first character which may be '+' or '-' for the relative string 308 * and othewise assume to be an absolute value string. If parsing fails 309 * a negative errno value is returned. All arguments and bitmaps are 310 * big endian order. 311 */ 312 int ap_parse_mask_str(const char *str, 313 unsigned long *bitmap, int bits, 314 struct mutex *lock); 315 316 #endif /* _AP_BUS_H_ */ 317