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 <linux/hashtable.h> 19 #include <asm/isc.h> 20 #include <asm/ap.h> 21 22 #define AP_DEVICES 256 /* Number of AP devices. */ 23 #define AP_DOMAINS 256 /* Number of AP domains. */ 24 #define AP_IOCTLS 256 /* Number of ioctls. */ 25 #define AP_RESET_TIMEOUT (HZ*0.7) /* Time in ticks for reset timeouts. */ 26 #define AP_CONFIG_TIME 30 /* Time in seconds between AP bus rescans. */ 27 #define AP_POLL_TIME 1 /* Time in ticks between receive polls. */ 28 #define AP_DEFAULT_MAX_MSG_SIZE (12 * 1024) 29 #define AP_TAPQ_ML_FIELD_CHUNK_SIZE (4096) 30 31 extern int ap_domain_index; 32 extern atomic_t ap_max_msg_size; 33 34 extern DECLARE_HASHTABLE(ap_queues, 8); 35 extern spinlock_t ap_queues_lock; 36 37 static inline int ap_test_bit(unsigned int *ptr, unsigned int nr) 38 { 39 return (*ptr & (0x80000000u >> nr)) != 0; 40 } 41 42 #define AP_RESPONSE_NORMAL 0x00 43 #define AP_RESPONSE_Q_NOT_AVAIL 0x01 44 #define AP_RESPONSE_RESET_IN_PROGRESS 0x02 45 #define AP_RESPONSE_DECONFIGURED 0x03 46 #define AP_RESPONSE_CHECKSTOPPED 0x04 47 #define AP_RESPONSE_BUSY 0x05 48 #define AP_RESPONSE_INVALID_ADDRESS 0x06 49 #define AP_RESPONSE_OTHERWISE_CHANGED 0x07 50 #define AP_RESPONSE_INVALID_GISA 0x08 51 #define AP_RESPONSE_Q_FULL 0x10 52 #define AP_RESPONSE_NO_PENDING_REPLY 0x10 53 #define AP_RESPONSE_INDEX_TOO_BIG 0x11 54 #define AP_RESPONSE_NO_FIRST_PART 0x13 55 #define AP_RESPONSE_MESSAGE_TOO_BIG 0x15 56 #define AP_RESPONSE_REQ_FAC_NOT_INST 0x16 57 #define AP_RESPONSE_INVALID_DOMAIN 0x42 58 59 /* 60 * Known device types 61 */ 62 #define AP_DEVICE_TYPE_PCICC 3 63 #define AP_DEVICE_TYPE_PCICA 4 64 #define AP_DEVICE_TYPE_PCIXCC 5 65 #define AP_DEVICE_TYPE_CEX2A 6 66 #define AP_DEVICE_TYPE_CEX2C 7 67 #define AP_DEVICE_TYPE_CEX3A 8 68 #define AP_DEVICE_TYPE_CEX3C 9 69 #define AP_DEVICE_TYPE_CEX4 10 70 #define AP_DEVICE_TYPE_CEX5 11 71 #define AP_DEVICE_TYPE_CEX6 12 72 #define AP_DEVICE_TYPE_CEX7 13 73 #define AP_DEVICE_TYPE_CEX8 14 74 75 /* 76 * Known function facilities 77 */ 78 #define AP_FUNC_MEX4K 1 79 #define AP_FUNC_CRT4K 2 80 #define AP_FUNC_COPRO 3 81 #define AP_FUNC_ACCEL 4 82 #define AP_FUNC_EP11 5 83 #define AP_FUNC_APXA 6 84 85 /* 86 * AP queue state machine states 87 */ 88 enum ap_sm_state { 89 AP_SM_STATE_RESET_START = 0, 90 AP_SM_STATE_RESET_WAIT, 91 AP_SM_STATE_SETIRQ_WAIT, 92 AP_SM_STATE_IDLE, 93 AP_SM_STATE_WORKING, 94 AP_SM_STATE_QUEUE_FULL, 95 NR_AP_SM_STATES 96 }; 97 98 /* 99 * AP queue state machine events 100 */ 101 enum ap_sm_event { 102 AP_SM_EVENT_POLL, 103 AP_SM_EVENT_TIMEOUT, 104 NR_AP_SM_EVENTS 105 }; 106 107 /* 108 * AP queue state wait behaviour 109 */ 110 enum ap_sm_wait { 111 AP_SM_WAIT_AGAIN = 0, /* retry immediately */ 112 AP_SM_WAIT_TIMEOUT, /* wait for timeout */ 113 AP_SM_WAIT_INTERRUPT, /* wait for thin interrupt (if available) */ 114 AP_SM_WAIT_NONE, /* no wait */ 115 NR_AP_SM_WAIT 116 }; 117 118 /* 119 * AP queue device states 120 */ 121 enum ap_dev_state { 122 AP_DEV_STATE_UNINITIATED = 0, /* fresh and virgin, not touched */ 123 AP_DEV_STATE_OPERATING, /* queue dev is working normal */ 124 AP_DEV_STATE_SHUTDOWN, /* remove/unbind/shutdown in progress */ 125 AP_DEV_STATE_ERROR, /* device is in error state */ 126 NR_AP_DEV_STATES 127 }; 128 129 struct ap_device; 130 struct ap_message; 131 132 /* 133 * The ap driver struct includes a flags field which holds some info for 134 * the ap bus about the driver. Currently only one flag is supported and 135 * used: The DEFAULT flag marks an ap driver as a default driver which is 136 * used together with the apmask and aqmask whitelisting of the ap bus. 137 */ 138 #define AP_DRIVER_FLAG_DEFAULT 0x0001 139 140 struct ap_driver { 141 struct device_driver driver; 142 struct ap_device_id *ids; 143 unsigned int flags; 144 145 int (*probe)(struct ap_device *); 146 void (*remove)(struct ap_device *); 147 int (*in_use)(unsigned long *apm, unsigned long *aqm); 148 /* 149 * Called at the start of the ap bus scan function when 150 * the crypto config information (qci) has changed. 151 * This callback is not invoked if there is no AP 152 * QCI support available. 153 */ 154 void (*on_config_changed)(struct ap_config_info *new_config_info, 155 struct ap_config_info *old_config_info); 156 /* 157 * Called at the end of the ap bus scan function when 158 * the crypto config information (qci) has changed. 159 * This callback is not invoked if there is no AP 160 * QCI support available. 161 */ 162 void (*on_scan_complete)(struct ap_config_info *new_config_info, 163 struct ap_config_info *old_config_info); 164 }; 165 166 #define to_ap_drv(x) container_of((x), struct ap_driver, driver) 167 168 int ap_driver_register(struct ap_driver *, struct module *, char *); 169 void ap_driver_unregister(struct ap_driver *); 170 171 struct ap_device { 172 struct device device; 173 int device_type; /* AP device type. */ 174 }; 175 176 #define to_ap_dev(x) container_of((x), struct ap_device, device) 177 178 struct ap_card { 179 struct ap_device ap_dev; 180 int raw_hwtype; /* AP raw hardware type. */ 181 unsigned int functions; /* AP device function bitfield. */ 182 int queue_depth; /* AP queue depth.*/ 183 int id; /* AP card number. */ 184 unsigned int maxmsgsize; /* AP msg limit for this card */ 185 bool config; /* configured state */ 186 bool chkstop; /* checkstop state */ 187 atomic64_t total_request_count; /* # requests ever for this AP device.*/ 188 }; 189 190 #define to_ap_card(x) container_of((x), struct ap_card, ap_dev.device) 191 192 struct ap_queue { 193 struct ap_device ap_dev; 194 struct hlist_node hnode; /* Node for the ap_queues hashtable */ 195 struct ap_card *card; /* Ptr to assoc. AP card. */ 196 spinlock_t lock; /* Per device lock. */ 197 enum ap_dev_state dev_state; /* queue device state */ 198 bool config; /* configured state */ 199 bool chkstop; /* checkstop state */ 200 ap_qid_t qid; /* AP queue id. */ 201 bool interrupt; /* indicate if interrupts are enabled */ 202 int queue_count; /* # messages currently on AP queue. */ 203 int pendingq_count; /* # requests on pendingq list. */ 204 int requestq_count; /* # requests on requestq list. */ 205 u64 total_request_count; /* # requests ever for this AP device.*/ 206 int request_timeout; /* Request timeout in jiffies. */ 207 struct timer_list timeout; /* Timer for request timeouts. */ 208 struct list_head pendingq; /* List of message sent to AP queue. */ 209 struct list_head requestq; /* List of message yet to be sent. */ 210 struct ap_message *reply; /* Per device reply message. */ 211 enum ap_sm_state sm_state; /* ap queue state machine state */ 212 int last_err_rc; /* last error state response code */ 213 }; 214 215 #define to_ap_queue(x) container_of((x), struct ap_queue, ap_dev.device) 216 217 typedef enum ap_sm_wait (ap_func_t)(struct ap_queue *queue); 218 219 /* failure injection cmd struct */ 220 struct ap_fi { 221 union { 222 u16 cmd; /* fi flags + action */ 223 struct { 224 u8 flags; /* fi flags only */ 225 u8 action; /* fi action only */ 226 }; 227 }; 228 }; 229 230 /* all currently known fi actions */ 231 enum ap_fi_actions { 232 AP_FI_ACTION_CCA_AGENT_FF = 0x01, 233 AP_FI_ACTION_CCA_DOM_INVAL = 0x02, 234 AP_FI_ACTION_NQAP_QID_INVAL = 0x03, 235 }; 236 237 /* all currently known fi flags */ 238 enum ap_fi_flags { 239 AP_FI_FLAG_NO_RETRY = 0x01, 240 AP_FI_FLAG_TOGGLE_SPECIAL = 0x02, 241 }; 242 243 struct ap_message { 244 struct list_head list; /* Request queueing. */ 245 unsigned long long psmid; /* Message id. */ 246 void *msg; /* Pointer to message buffer. */ 247 unsigned int len; /* actual msg len in msg buffer */ 248 unsigned int bufsize; /* allocated msg buffer size */ 249 u16 flags; /* Flags, see AP_MSG_FLAG_xxx */ 250 struct ap_fi fi; /* Failure Injection cmd */ 251 int rc; /* Return code for this message */ 252 void *private; /* ap driver private pointer. */ 253 /* receive is called from tasklet context */ 254 void (*receive)(struct ap_queue *, struct ap_message *, 255 struct ap_message *); 256 }; 257 258 #define AP_MSG_FLAG_SPECIAL 0x0001 /* flag msg as 'special' with NQAP */ 259 #define AP_MSG_FLAG_USAGE 0x0002 /* CCA, EP11: usage (no admin) msg */ 260 #define AP_MSG_FLAG_ADMIN 0x0004 /* CCA, EP11: admin (=control) msg */ 261 262 /** 263 * ap_init_message() - Initialize ap_message. 264 * Initialize a message before using. Otherwise this might result in 265 * unexpected behaviour. 266 */ 267 static inline void ap_init_message(struct ap_message *ap_msg) 268 { 269 memset(ap_msg, 0, sizeof(*ap_msg)); 270 } 271 272 /** 273 * ap_release_message() - Release ap_message. 274 * Releases all memory used internal within the ap_message struct 275 * Currently this is the message and private field. 276 */ 277 static inline void ap_release_message(struct ap_message *ap_msg) 278 { 279 kfree_sensitive(ap_msg->msg); 280 kfree_sensitive(ap_msg->private); 281 } 282 283 /* 284 * Note: don't use ap_send/ap_recv after using ap_queue_message 285 * for the first time. Otherwise the ap message queue will get 286 * confused. 287 */ 288 int ap_send(ap_qid_t, unsigned long long, void *, size_t); 289 int ap_recv(ap_qid_t, unsigned long long *, void *, size_t); 290 291 enum ap_sm_wait ap_sm_event(struct ap_queue *aq, enum ap_sm_event event); 292 enum ap_sm_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_sm_event event); 293 294 int ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg); 295 void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg); 296 void ap_flush_queue(struct ap_queue *aq); 297 298 void *ap_airq_ptr(void); 299 void ap_wait(enum ap_sm_wait wait); 300 void ap_request_timeout(struct timer_list *t); 301 void ap_bus_force_rescan(void); 302 303 int ap_test_config_usage_domain(unsigned int domain); 304 int ap_test_config_ctrl_domain(unsigned int domain); 305 306 void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *ap_msg); 307 struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type); 308 void ap_queue_prepare_remove(struct ap_queue *aq); 309 void ap_queue_remove(struct ap_queue *aq); 310 void ap_queue_init_state(struct ap_queue *aq); 311 312 struct ap_card *ap_card_create(int id, int queue_depth, int raw_type, 313 int comp_type, unsigned int functions, int ml); 314 315 #define APMASKSIZE (BITS_TO_LONGS(AP_DEVICES) * sizeof(unsigned long)) 316 #define AQMASKSIZE (BITS_TO_LONGS(AP_DOMAINS) * sizeof(unsigned long)) 317 318 struct ap_perms { 319 unsigned long ioctlm[BITS_TO_LONGS(AP_IOCTLS)]; 320 unsigned long apm[BITS_TO_LONGS(AP_DEVICES)]; 321 unsigned long aqm[BITS_TO_LONGS(AP_DOMAINS)]; 322 unsigned long adm[BITS_TO_LONGS(AP_DOMAINS)]; 323 }; 324 325 extern struct ap_perms ap_perms; 326 extern struct mutex ap_perms_mutex; 327 328 /* 329 * Get ap_queue device for this qid. 330 * Returns ptr to the struct ap_queue device or NULL if there 331 * was no ap_queue device with this qid found. When something is 332 * found, the reference count of the embedded device is increased. 333 * So the caller has to decrease the reference count after use 334 * with a call to put_device(&aq->ap_dev.device). 335 */ 336 struct ap_queue *ap_get_qdev(ap_qid_t qid); 337 338 /* 339 * check APQN for owned/reserved by ap bus and default driver(s). 340 * Checks if this APQN is or will be in use by the ap bus 341 * and the default set of drivers. 342 * If yes, returns 1, if not returns 0. On error a negative 343 * errno value is returned. 344 */ 345 int ap_owned_by_def_drv(int card, int queue); 346 347 /* 348 * check 'matrix' of APQNs for owned/reserved by ap bus and 349 * default driver(s). 350 * Checks if there is at least one APQN in the given 'matrix' 351 * marked as owned/reserved by the ap bus and default driver(s). 352 * If such an APQN is found the return value is 1, otherwise 353 * 0 is returned. On error a negative errno value is returned. 354 * The parameter apm is a bitmask which should be declared 355 * as DECLARE_BITMAP(apm, AP_DEVICES), the aqm parameter is 356 * similar, should be declared as DECLARE_BITMAP(aqm, AP_DOMAINS). 357 */ 358 int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm, 359 unsigned long *aqm); 360 361 /* 362 * ap_parse_mask_str() - helper function to parse a bitmap string 363 * and clear/set the bits in the bitmap accordingly. The string may be 364 * given as absolute value, a hex string like 0x1F2E3D4C5B6A" simple 365 * overwriting the current content of the bitmap. Or as relative string 366 * like "+1-16,-32,-0x40,+128" where only single bits or ranges of 367 * bits are cleared or set. Distinction is done based on the very 368 * first character which may be '+' or '-' for the relative string 369 * and othewise assume to be an absolute value string. If parsing fails 370 * a negative errno value is returned. All arguments and bitmaps are 371 * big endian order. 372 */ 373 int ap_parse_mask_str(const char *str, 374 unsigned long *bitmap, int bits, 375 struct mutex *lock); 376 377 /* 378 * Interface to wait for the AP bus to have done one initial ap bus 379 * scan and all detected APQNs have been bound to device drivers. 380 * If these both conditions are not fulfilled, this function blocks 381 * on a condition with wait_for_completion_killable_timeout(). 382 * If these both conditions are fulfilled (before the timeout hits) 383 * the return value is 0. If the timeout (in jiffies) hits instead 384 * -ETIME is returned. On failures negative return values are 385 * returned to the caller. 386 */ 387 int ap_wait_init_apqn_bindings_complete(unsigned long timeout); 388 389 void ap_send_config_uevent(struct ap_device *ap_dev, bool cfg); 390 void ap_send_online_uevent(struct ap_device *ap_dev, int online); 391 392 #endif /* _AP_BUS_H_ */ 393