Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1 | /* |
| 2 | * ipmi_ssif.c |
| 3 | * |
| 4 | * The interface to the IPMI driver for SMBus access to a SMBus |
| 5 | * compliant device. Called SSIF by the IPMI spec. |
| 6 | * |
| 7 | * Author: Intel Corporation |
| 8 | * Todd Davis <todd.c.davis@intel.com> |
| 9 | * |
| 10 | * Rewritten by Corey Minyard <minyard@acm.org> to support the |
| 11 | * non-blocking I2C interface, add support for multi-part |
| 12 | * transactions, add PEC support, and general clenaup. |
| 13 | * |
| 14 | * Copyright 2003 Intel Corporation |
| 15 | * Copyright 2005 MontaVista Software |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or modify it |
| 18 | * under the terms of the GNU General Public License as published by the |
| 19 | * Free Software Foundation; either version 2 of the License, or (at your |
| 20 | * option) any later version. |
| 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * This file holds the "policy" for the interface to the SSIF state |
| 25 | * machine. It does the configuration, handles timers and interrupts, |
| 26 | * and drives the real SSIF state machine. |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * TODO: Figure out how to use SMB alerts. This will require a new |
| 31 | * interface into the I2C driver, I believe. |
| 32 | */ |
| 33 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 34 | #if defined(MODVERSIONS) |
| 35 | #include <linux/modversions.h> |
| 36 | #endif |
| 37 | |
| 38 | #include <linux/module.h> |
| 39 | #include <linux/moduleparam.h> |
| 40 | #include <linux/sched.h> |
| 41 | #include <linux/seq_file.h> |
| 42 | #include <linux/timer.h> |
| 43 | #include <linux/delay.h> |
| 44 | #include <linux/errno.h> |
| 45 | #include <linux/spinlock.h> |
| 46 | #include <linux/slab.h> |
| 47 | #include <linux/list.h> |
| 48 | #include <linux/i2c.h> |
| 49 | #include <linux/ipmi_smi.h> |
| 50 | #include <linux/init.h> |
| 51 | #include <linux/dmi.h> |
| 52 | #include <linux/kthread.h> |
| 53 | #include <linux/acpi.h> |
Corey Minyard | e3fe142 | 2014-12-16 08:36:32 -0600 | [diff] [blame] | 54 | #include <linux/ctype.h> |
Amitoj Kaur Chawla | 526290a | 2015-10-24 01:21:04 +0530 | [diff] [blame] | 55 | #include <linux/time64.h> |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 56 | |
| 57 | #define PFX "ipmi_ssif: " |
| 58 | #define DEVICE_NAME "ipmi_ssif" |
| 59 | |
| 60 | #define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57 |
| 61 | |
| 62 | #define SSIF_IPMI_REQUEST 2 |
| 63 | #define SSIF_IPMI_MULTI_PART_REQUEST_START 6 |
| 64 | #define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7 |
| 65 | #define SSIF_IPMI_RESPONSE 3 |
| 66 | #define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9 |
| 67 | |
| 68 | /* ssif_debug is a bit-field |
| 69 | * SSIF_DEBUG_MSG - commands and their responses |
| 70 | * SSIF_DEBUG_STATES - message states |
| 71 | * SSIF_DEBUG_TIMING - Measure times between events in the driver |
| 72 | */ |
| 73 | #define SSIF_DEBUG_TIMING 4 |
| 74 | #define SSIF_DEBUG_STATE 2 |
| 75 | #define SSIF_DEBUG_MSG 1 |
| 76 | #define SSIF_NODEBUG 0 |
| 77 | #define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG) |
| 78 | |
| 79 | /* |
| 80 | * Timer values |
| 81 | */ |
| 82 | #define SSIF_MSG_USEC 20000 /* 20ms between message tries. */ |
| 83 | #define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */ |
| 84 | |
| 85 | /* How many times to we retry sending/receiving the message. */ |
| 86 | #define SSIF_SEND_RETRIES 5 |
| 87 | #define SSIF_RECV_RETRIES 250 |
| 88 | |
| 89 | #define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000) |
| 90 | #define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC) |
| 91 | #define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC) |
| 92 | |
| 93 | enum ssif_intf_state { |
| 94 | SSIF_NORMAL, |
| 95 | SSIF_GETTING_FLAGS, |
| 96 | SSIF_GETTING_EVENTS, |
| 97 | SSIF_CLEARING_FLAGS, |
| 98 | SSIF_GETTING_MESSAGES, |
| 99 | /* FIXME - add watchdog stuff. */ |
| 100 | }; |
| 101 | |
| 102 | #define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \ |
| 103 | && (ssif)->curr_msg == NULL) |
| 104 | |
| 105 | /* |
| 106 | * Indexes into stats[] in ssif_info below. |
| 107 | */ |
| 108 | enum ssif_stat_indexes { |
| 109 | /* Number of total messages sent. */ |
| 110 | SSIF_STAT_sent_messages = 0, |
| 111 | |
| 112 | /* |
| 113 | * Number of message parts sent. Messages may be broken into |
| 114 | * parts if they are long. |
| 115 | */ |
| 116 | SSIF_STAT_sent_messages_parts, |
| 117 | |
| 118 | /* |
| 119 | * Number of time a message was retried. |
| 120 | */ |
| 121 | SSIF_STAT_send_retries, |
| 122 | |
| 123 | /* |
| 124 | * Number of times the send of a message failed. |
| 125 | */ |
| 126 | SSIF_STAT_send_errors, |
| 127 | |
| 128 | /* |
| 129 | * Number of message responses received. |
| 130 | */ |
| 131 | SSIF_STAT_received_messages, |
| 132 | |
| 133 | /* |
| 134 | * Number of message fragments received. |
| 135 | */ |
| 136 | SSIF_STAT_received_message_parts, |
| 137 | |
| 138 | /* |
| 139 | * Number of times the receive of a message was retried. |
| 140 | */ |
| 141 | SSIF_STAT_receive_retries, |
| 142 | |
| 143 | /* |
| 144 | * Number of errors receiving messages. |
| 145 | */ |
| 146 | SSIF_STAT_receive_errors, |
| 147 | |
| 148 | /* |
| 149 | * Number of times a flag fetch was requested. |
| 150 | */ |
| 151 | SSIF_STAT_flag_fetches, |
| 152 | |
| 153 | /* |
| 154 | * Number of times the hardware didn't follow the state machine. |
| 155 | */ |
| 156 | SSIF_STAT_hosed, |
| 157 | |
| 158 | /* |
| 159 | * Number of received events. |
| 160 | */ |
| 161 | SSIF_STAT_events, |
| 162 | |
| 163 | /* Number of asyncronous messages received. */ |
| 164 | SSIF_STAT_incoming_messages, |
| 165 | |
| 166 | /* Number of watchdog pretimeouts. */ |
| 167 | SSIF_STAT_watchdog_pretimeouts, |
| 168 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 169 | /* Number of alers received. */ |
| 170 | SSIF_STAT_alerts, |
| 171 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 172 | /* Always add statistics before this value, it must be last. */ |
| 173 | SSIF_NUM_STATS |
| 174 | }; |
| 175 | |
| 176 | struct ssif_addr_info { |
| 177 | unsigned short addr; |
| 178 | struct i2c_board_info binfo; |
| 179 | char *adapter_name; |
| 180 | int debug; |
| 181 | int slave_addr; |
| 182 | enum ipmi_addr_src addr_src; |
| 183 | union ipmi_smi_info_union addr_info; |
| 184 | |
| 185 | struct mutex clients_mutex; |
| 186 | struct list_head clients; |
| 187 | |
| 188 | struct list_head link; |
| 189 | }; |
| 190 | |
| 191 | struct ssif_info; |
| 192 | |
| 193 | typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result, |
| 194 | unsigned char *data, unsigned int len); |
| 195 | |
| 196 | struct ssif_info { |
| 197 | ipmi_smi_t intf; |
| 198 | int intf_num; |
| 199 | spinlock_t lock; |
| 200 | struct ipmi_smi_msg *waiting_msg; |
| 201 | struct ipmi_smi_msg *curr_msg; |
| 202 | enum ssif_intf_state ssif_state; |
| 203 | unsigned long ssif_debug; |
| 204 | |
| 205 | struct ipmi_smi_handlers handlers; |
| 206 | |
| 207 | enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */ |
| 208 | union ipmi_smi_info_union addr_info; |
| 209 | |
| 210 | /* |
| 211 | * Flags from the last GET_MSG_FLAGS command, used when an ATTN |
| 212 | * is set to hold the flags until we are done handling everything |
| 213 | * from the flags. |
| 214 | */ |
| 215 | #define RECEIVE_MSG_AVAIL 0x01 |
| 216 | #define EVENT_MSG_BUFFER_FULL 0x02 |
| 217 | #define WDT_PRE_TIMEOUT_INT 0x08 |
| 218 | unsigned char msg_flags; |
| 219 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 220 | u8 global_enables; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 221 | bool has_event_buffer; |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 222 | bool supports_alert; |
| 223 | |
| 224 | /* |
| 225 | * Used to tell what we should do with alerts. If we are |
| 226 | * waiting on a response, read the data immediately. |
| 227 | */ |
| 228 | bool got_alert; |
| 229 | bool waiting_alert; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 230 | |
| 231 | /* |
| 232 | * If set to true, this will request events the next time the |
| 233 | * state machine is idle. |
| 234 | */ |
| 235 | bool req_events; |
| 236 | |
| 237 | /* |
| 238 | * If set to true, this will request flags the next time the |
| 239 | * state machine is idle. |
| 240 | */ |
| 241 | bool req_flags; |
| 242 | |
| 243 | /* |
| 244 | * Used to perform timer operations when run-to-completion |
| 245 | * mode is on. This is a countdown timer. |
| 246 | */ |
| 247 | int rtc_us_timer; |
| 248 | |
| 249 | /* Used for sending/receiving data. +1 for the length. */ |
| 250 | unsigned char data[IPMI_MAX_MSG_LENGTH + 1]; |
| 251 | unsigned int data_len; |
| 252 | |
| 253 | /* Temp receive buffer, gets copied into data. */ |
| 254 | unsigned char recv[I2C_SMBUS_BLOCK_MAX]; |
| 255 | |
| 256 | struct i2c_client *client; |
| 257 | ssif_i2c_done done_handler; |
| 258 | |
| 259 | /* Thread interface handling */ |
| 260 | struct task_struct *thread; |
| 261 | struct completion wake_thread; |
| 262 | bool stopping; |
| 263 | int i2c_read_write; |
| 264 | int i2c_command; |
| 265 | unsigned char *i2c_data; |
| 266 | unsigned int i2c_size; |
| 267 | |
| 268 | /* From the device id response. */ |
| 269 | struct ipmi_device_id device_id; |
| 270 | |
| 271 | struct timer_list retry_timer; |
| 272 | int retries_left; |
| 273 | |
| 274 | /* Info from SSIF cmd */ |
| 275 | unsigned char max_xmit_msg_size; |
| 276 | unsigned char max_recv_msg_size; |
| 277 | unsigned int multi_support; |
| 278 | int supports_pec; |
| 279 | |
| 280 | #define SSIF_NO_MULTI 0 |
| 281 | #define SSIF_MULTI_2_PART 1 |
| 282 | #define SSIF_MULTI_n_PART 2 |
| 283 | unsigned char *multi_data; |
| 284 | unsigned int multi_len; |
| 285 | unsigned int multi_pos; |
| 286 | |
| 287 | atomic_t stats[SSIF_NUM_STATS]; |
| 288 | }; |
| 289 | |
| 290 | #define ssif_inc_stat(ssif, stat) \ |
| 291 | atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat]) |
| 292 | #define ssif_get_stat(ssif, stat) \ |
| 293 | ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat])) |
| 294 | |
| 295 | static bool initialized; |
| 296 | |
| 297 | static atomic_t next_intf = ATOMIC_INIT(0); |
| 298 | |
| 299 | static void return_hosed_msg(struct ssif_info *ssif_info, |
| 300 | struct ipmi_smi_msg *msg); |
| 301 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags); |
| 302 | static int start_send(struct ssif_info *ssif_info, |
| 303 | unsigned char *data, |
| 304 | unsigned int len); |
| 305 | |
| 306 | static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info, |
| 307 | unsigned long *flags) |
| 308 | { |
| 309 | spin_lock_irqsave(&ssif_info->lock, *flags); |
| 310 | return flags; |
| 311 | } |
| 312 | |
| 313 | static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info, |
| 314 | unsigned long *flags) |
| 315 | { |
| 316 | spin_unlock_irqrestore(&ssif_info->lock, *flags); |
| 317 | } |
| 318 | |
| 319 | static void deliver_recv_msg(struct ssif_info *ssif_info, |
| 320 | struct ipmi_smi_msg *msg) |
| 321 | { |
| 322 | ipmi_smi_t intf = ssif_info->intf; |
| 323 | |
| 324 | if (!intf) { |
| 325 | ipmi_free_smi_msg(msg); |
| 326 | } else if (msg->rsp_size < 0) { |
| 327 | return_hosed_msg(ssif_info, msg); |
| 328 | pr_err(PFX |
| 329 | "Malformed message in deliver_recv_msg: rsp_size = %d\n", |
| 330 | msg->rsp_size); |
| 331 | } else { |
| 332 | ipmi_smi_msg_received(intf, msg); |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | static void return_hosed_msg(struct ssif_info *ssif_info, |
| 337 | struct ipmi_smi_msg *msg) |
| 338 | { |
| 339 | ssif_inc_stat(ssif_info, hosed); |
| 340 | |
| 341 | /* Make it a response */ |
| 342 | msg->rsp[0] = msg->data[0] | 4; |
| 343 | msg->rsp[1] = msg->data[1]; |
| 344 | msg->rsp[2] = 0xFF; /* Unknown error. */ |
| 345 | msg->rsp_size = 3; |
| 346 | |
| 347 | deliver_recv_msg(ssif_info, msg); |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * Must be called with the message lock held. This will release the |
| 352 | * message lock. Note that the caller will check SSIF_IDLE and start a |
| 353 | * new operation, so there is no need to check for new messages to |
| 354 | * start in here. |
| 355 | */ |
| 356 | static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags) |
| 357 | { |
| 358 | unsigned char msg[3]; |
| 359 | |
| 360 | ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; |
| 361 | ssif_info->ssif_state = SSIF_CLEARING_FLAGS; |
| 362 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 363 | |
| 364 | /* Make sure the watchdog pre-timeout flag is not set at startup. */ |
| 365 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); |
| 366 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; |
| 367 | msg[2] = WDT_PRE_TIMEOUT_INT; |
| 368 | |
| 369 | if (start_send(ssif_info, msg, 3) != 0) { |
| 370 | /* Error, just go to normal state. */ |
| 371 | ssif_info->ssif_state = SSIF_NORMAL; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags) |
| 376 | { |
| 377 | unsigned char mb[2]; |
| 378 | |
| 379 | ssif_info->req_flags = false; |
| 380 | ssif_info->ssif_state = SSIF_GETTING_FLAGS; |
| 381 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 382 | |
| 383 | mb[0] = (IPMI_NETFN_APP_REQUEST << 2); |
| 384 | mb[1] = IPMI_GET_MSG_FLAGS_CMD; |
| 385 | if (start_send(ssif_info, mb, 2) != 0) |
| 386 | ssif_info->ssif_state = SSIF_NORMAL; |
| 387 | } |
| 388 | |
| 389 | static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags, |
| 390 | struct ipmi_smi_msg *msg) |
| 391 | { |
| 392 | if (start_send(ssif_info, msg->data, msg->data_size) != 0) { |
| 393 | unsigned long oflags; |
| 394 | |
| 395 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 396 | ssif_info->curr_msg = NULL; |
| 397 | ssif_info->ssif_state = SSIF_NORMAL; |
| 398 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 399 | ipmi_free_smi_msg(msg); |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags) |
| 404 | { |
| 405 | struct ipmi_smi_msg *msg; |
| 406 | |
| 407 | ssif_info->req_events = false; |
| 408 | |
| 409 | msg = ipmi_alloc_smi_msg(); |
| 410 | if (!msg) { |
| 411 | ssif_info->ssif_state = SSIF_NORMAL; |
Dan Carpenter | ad741cc | 2017-05-05 08:33:24 +0300 | [diff] [blame] | 412 | ipmi_ssif_unlock_cond(ssif_info, flags); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 413 | return; |
| 414 | } |
| 415 | |
| 416 | ssif_info->curr_msg = msg; |
| 417 | ssif_info->ssif_state = SSIF_GETTING_EVENTS; |
| 418 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 419 | |
| 420 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); |
| 421 | msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; |
| 422 | msg->data_size = 2; |
| 423 | |
| 424 | check_start_send(ssif_info, flags, msg); |
| 425 | } |
| 426 | |
| 427 | static void start_recv_msg_fetch(struct ssif_info *ssif_info, |
| 428 | unsigned long *flags) |
| 429 | { |
| 430 | struct ipmi_smi_msg *msg; |
| 431 | |
| 432 | msg = ipmi_alloc_smi_msg(); |
| 433 | if (!msg) { |
| 434 | ssif_info->ssif_state = SSIF_NORMAL; |
Dan Carpenter | ad741cc | 2017-05-05 08:33:24 +0300 | [diff] [blame] | 435 | ipmi_ssif_unlock_cond(ssif_info, flags); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 436 | return; |
| 437 | } |
| 438 | |
| 439 | ssif_info->curr_msg = msg; |
| 440 | ssif_info->ssif_state = SSIF_GETTING_MESSAGES; |
| 441 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 442 | |
| 443 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); |
| 444 | msg->data[1] = IPMI_GET_MSG_CMD; |
| 445 | msg->data_size = 2; |
| 446 | |
| 447 | check_start_send(ssif_info, flags, msg); |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Must be called with the message lock held. This will release the |
| 452 | * message lock. Note that the caller will check SSIF_IDLE and start a |
| 453 | * new operation, so there is no need to check for new messages to |
| 454 | * start in here. |
| 455 | */ |
| 456 | static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags) |
| 457 | { |
| 458 | if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) { |
| 459 | ipmi_smi_t intf = ssif_info->intf; |
| 460 | /* Watchdog pre-timeout */ |
| 461 | ssif_inc_stat(ssif_info, watchdog_pretimeouts); |
| 462 | start_clear_flags(ssif_info, flags); |
| 463 | if (intf) |
| 464 | ipmi_smi_watchdog_pretimeout(intf); |
| 465 | } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL) |
| 466 | /* Messages available. */ |
| 467 | start_recv_msg_fetch(ssif_info, flags); |
| 468 | else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL) |
| 469 | /* Events available. */ |
| 470 | start_event_fetch(ssif_info, flags); |
| 471 | else { |
| 472 | ssif_info->ssif_state = SSIF_NORMAL; |
| 473 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | static int ipmi_ssif_thread(void *data) |
| 478 | { |
| 479 | struct ssif_info *ssif_info = data; |
| 480 | |
| 481 | while (!kthread_should_stop()) { |
| 482 | int result; |
| 483 | |
| 484 | /* Wait for something to do */ |
Corey Minyard | d0acf73 | 2015-04-04 01:54:26 -0500 | [diff] [blame] | 485 | result = wait_for_completion_interruptible( |
| 486 | &ssif_info->wake_thread); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 487 | if (ssif_info->stopping) |
| 488 | break; |
Corey Minyard | d0acf73 | 2015-04-04 01:54:26 -0500 | [diff] [blame] | 489 | if (result == -ERESTARTSYS) |
| 490 | continue; |
| 491 | init_completion(&ssif_info->wake_thread); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 492 | |
| 493 | if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) { |
| 494 | result = i2c_smbus_write_block_data( |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 495 | ssif_info->client, ssif_info->i2c_command, |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 496 | ssif_info->i2c_data[0], |
| 497 | ssif_info->i2c_data + 1); |
| 498 | ssif_info->done_handler(ssif_info, result, NULL, 0); |
| 499 | } else { |
| 500 | result = i2c_smbus_read_block_data( |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 501 | ssif_info->client, ssif_info->i2c_command, |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 502 | ssif_info->i2c_data); |
| 503 | if (result < 0) |
| 504 | ssif_info->done_handler(ssif_info, result, |
| 505 | NULL, 0); |
| 506 | else |
| 507 | ssif_info->done_handler(ssif_info, 0, |
| 508 | ssif_info->i2c_data, |
| 509 | result); |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | static int ssif_i2c_send(struct ssif_info *ssif_info, |
| 517 | ssif_i2c_done handler, |
| 518 | int read_write, int command, |
| 519 | unsigned char *data, unsigned int size) |
| 520 | { |
| 521 | ssif_info->done_handler = handler; |
| 522 | |
| 523 | ssif_info->i2c_read_write = read_write; |
| 524 | ssif_info->i2c_command = command; |
| 525 | ssif_info->i2c_data = data; |
| 526 | ssif_info->i2c_size = size; |
| 527 | complete(&ssif_info->wake_thread); |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | |
| 532 | static void msg_done_handler(struct ssif_info *ssif_info, int result, |
| 533 | unsigned char *data, unsigned int len); |
| 534 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 535 | static void start_get(struct ssif_info *ssif_info) |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 536 | { |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 537 | int rv; |
| 538 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 539 | ssif_info->rtc_us_timer = 0; |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 540 | ssif_info->multi_pos = 0; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 541 | |
| 542 | rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, |
| 543 | SSIF_IPMI_RESPONSE, |
| 544 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); |
| 545 | if (rv < 0) { |
| 546 | /* request failed, just return the error. */ |
| 547 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 548 | pr_info("Error from i2c_non_blocking_op(5)\n"); |
| 549 | |
| 550 | msg_done_handler(ssif_info, -EIO, NULL, 0); |
| 551 | } |
| 552 | } |
| 553 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 554 | static void retry_timeout(unsigned long data) |
| 555 | { |
| 556 | struct ssif_info *ssif_info = (void *) data; |
| 557 | unsigned long oflags, *flags; |
| 558 | bool waiting; |
| 559 | |
| 560 | if (ssif_info->stopping) |
| 561 | return; |
| 562 | |
| 563 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 564 | waiting = ssif_info->waiting_alert; |
| 565 | ssif_info->waiting_alert = false; |
| 566 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 567 | |
| 568 | if (waiting) |
| 569 | start_get(ssif_info); |
| 570 | } |
| 571 | |
| 572 | |
Benjamin Tissoires | b4f2105 | 2016-06-09 16:53:47 +0200 | [diff] [blame] | 573 | static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type, |
| 574 | unsigned int data) |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 575 | { |
| 576 | struct ssif_info *ssif_info = i2c_get_clientdata(client); |
| 577 | unsigned long oflags, *flags; |
| 578 | bool do_get = false; |
| 579 | |
Benjamin Tissoires | b4f2105 | 2016-06-09 16:53:47 +0200 | [diff] [blame] | 580 | if (type != I2C_PROTOCOL_SMBUS_ALERT) |
| 581 | return; |
| 582 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 583 | ssif_inc_stat(ssif_info, alerts); |
| 584 | |
| 585 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 586 | if (ssif_info->waiting_alert) { |
| 587 | ssif_info->waiting_alert = false; |
| 588 | del_timer(&ssif_info->retry_timer); |
| 589 | do_get = true; |
| 590 | } else if (ssif_info->curr_msg) { |
| 591 | ssif_info->got_alert = true; |
| 592 | } |
| 593 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 594 | if (do_get) |
| 595 | start_get(ssif_info); |
| 596 | } |
| 597 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 598 | static int start_resend(struct ssif_info *ssif_info); |
| 599 | |
| 600 | static void msg_done_handler(struct ssif_info *ssif_info, int result, |
| 601 | unsigned char *data, unsigned int len) |
| 602 | { |
| 603 | struct ipmi_smi_msg *msg; |
| 604 | unsigned long oflags, *flags; |
| 605 | int rv; |
| 606 | |
| 607 | /* |
| 608 | * We are single-threaded here, so no need for a lock until we |
| 609 | * start messing with driver states or the queues. |
| 610 | */ |
| 611 | |
| 612 | if (result < 0) { |
| 613 | ssif_info->retries_left--; |
| 614 | if (ssif_info->retries_left > 0) { |
| 615 | ssif_inc_stat(ssif_info, receive_retries); |
| 616 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 617 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 618 | ssif_info->waiting_alert = true; |
| 619 | ssif_info->rtc_us_timer = SSIF_MSG_USEC; |
Jan Glauber | 9aba7dd | 2018-10-11 12:13:01 +0200 | [diff] [blame] | 620 | if (!ssif_info->stopping) |
| 621 | mod_timer(&ssif_info->retry_timer, |
| 622 | jiffies + SSIF_MSG_JIFFIES); |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 623 | ipmi_ssif_unlock_cond(ssif_info, flags); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 624 | return; |
| 625 | } |
| 626 | |
| 627 | ssif_inc_stat(ssif_info, receive_errors); |
| 628 | |
| 629 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 630 | pr_info("Error in msg_done_handler: %d\n", result); |
| 631 | len = 0; |
| 632 | goto continue_op; |
| 633 | } |
| 634 | |
| 635 | if ((len > 1) && (ssif_info->multi_pos == 0) |
| 636 | && (data[0] == 0x00) && (data[1] == 0x01)) { |
| 637 | /* Start of multi-part read. Start the next transaction. */ |
| 638 | int i; |
| 639 | |
| 640 | ssif_inc_stat(ssif_info, received_message_parts); |
| 641 | |
| 642 | /* Remove the multi-part read marker. */ |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 643 | len -= 2; |
Corey Minyard | cac2590 | 2018-11-16 09:59:21 -0600 | [diff] [blame] | 644 | data += 2; |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 645 | for (i = 0; i < len; i++) |
Corey Minyard | cac2590 | 2018-11-16 09:59:21 -0600 | [diff] [blame] | 646 | ssif_info->data[i] = data[i]; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 647 | ssif_info->multi_len = len; |
| 648 | ssif_info->multi_pos = 1; |
| 649 | |
| 650 | rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, |
| 651 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, |
| 652 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); |
| 653 | if (rv < 0) { |
| 654 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 655 | pr_info("Error from i2c_non_blocking_op(1)\n"); |
| 656 | |
| 657 | result = -EIO; |
| 658 | } else |
| 659 | return; |
| 660 | } else if (ssif_info->multi_pos) { |
| 661 | /* Middle of multi-part read. Start the next transaction. */ |
| 662 | int i; |
| 663 | unsigned char blocknum; |
| 664 | |
| 665 | if (len == 0) { |
| 666 | result = -EIO; |
| 667 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 668 | pr_info(PFX "Middle message with no data\n"); |
| 669 | |
| 670 | goto continue_op; |
| 671 | } |
| 672 | |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 673 | blocknum = data[0]; |
Corey Minyard | cac2590 | 2018-11-16 09:59:21 -0600 | [diff] [blame] | 674 | len--; |
| 675 | data++; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 676 | |
Corey Minyard | cac2590 | 2018-11-16 09:59:21 -0600 | [diff] [blame] | 677 | if (blocknum != 0xff && len != 31) { |
| 678 | /* All blocks but the last must have 31 data bytes. */ |
| 679 | result = -EIO; |
| 680 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 681 | pr_info("Received middle message <31\n"); |
| 682 | |
| 683 | goto continue_op; |
| 684 | } |
| 685 | |
| 686 | if (ssif_info->multi_len + len > IPMI_MAX_MSG_LENGTH) { |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 687 | /* Received message too big, abort the operation. */ |
| 688 | result = -E2BIG; |
| 689 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 690 | pr_info("Received message too big\n"); |
| 691 | |
| 692 | goto continue_op; |
| 693 | } |
| 694 | |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 695 | for (i = 0; i < len; i++) |
Corey Minyard | cac2590 | 2018-11-16 09:59:21 -0600 | [diff] [blame] | 696 | ssif_info->data[i + ssif_info->multi_len] = data[i]; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 697 | ssif_info->multi_len += len; |
| 698 | if (blocknum == 0xff) { |
| 699 | /* End of read */ |
| 700 | len = ssif_info->multi_len; |
| 701 | data = ssif_info->data; |
Kamlakant Patel | a2a2a14 | 2019-04-24 11:50:43 +0000 | [diff] [blame] | 702 | } else if (blocknum + 1 != ssif_info->multi_pos) { |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 703 | /* |
| 704 | * Out of sequence block, just abort. Block |
| 705 | * numbers start at zero for the second block, |
| 706 | * but multi_pos starts at one, so the +1. |
| 707 | */ |
Kamlakant Patel | a2a2a14 | 2019-04-24 11:50:43 +0000 | [diff] [blame] | 708 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 709 | dev_dbg(&ssif_info->client->dev, |
| 710 | "Received message out of sequence, expected %u, got %u\n", |
| 711 | ssif_info->multi_pos - 1, blocknum); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 712 | result = -EIO; |
| 713 | } else { |
| 714 | ssif_inc_stat(ssif_info, received_message_parts); |
| 715 | |
| 716 | ssif_info->multi_pos++; |
| 717 | |
| 718 | rv = ssif_i2c_send(ssif_info, msg_done_handler, |
| 719 | I2C_SMBUS_READ, |
| 720 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, |
| 721 | ssif_info->recv, |
| 722 | I2C_SMBUS_BLOCK_DATA); |
| 723 | if (rv < 0) { |
| 724 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 725 | pr_info(PFX |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 726 | "Error from ssif_i2c_send\n"); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 727 | |
| 728 | result = -EIO; |
| 729 | } else |
| 730 | return; |
| 731 | } |
| 732 | } |
| 733 | |
Corey Minyard | cac2590 | 2018-11-16 09:59:21 -0600 | [diff] [blame] | 734 | continue_op: |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 735 | if (result < 0) { |
| 736 | ssif_inc_stat(ssif_info, receive_errors); |
| 737 | } else { |
| 738 | ssif_inc_stat(ssif_info, received_messages); |
| 739 | ssif_inc_stat(ssif_info, received_message_parts); |
| 740 | } |
| 741 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 742 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) |
| 743 | pr_info(PFX "DONE 1: state = %d, result=%d.\n", |
| 744 | ssif_info->ssif_state, result); |
| 745 | |
| 746 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 747 | msg = ssif_info->curr_msg; |
| 748 | if (msg) { |
Corey Minyard | dcbb950 | 2019-12-23 10:42:19 -0600 | [diff] [blame] | 749 | if (data) { |
| 750 | if (len > IPMI_MAX_MSG_LENGTH) |
| 751 | len = IPMI_MAX_MSG_LENGTH; |
| 752 | memcpy(msg->rsp, data, len); |
| 753 | } else { |
| 754 | len = 0; |
| 755 | } |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 756 | msg->rsp_size = len; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 757 | ssif_info->curr_msg = NULL; |
| 758 | } |
| 759 | |
| 760 | switch (ssif_info->ssif_state) { |
| 761 | case SSIF_NORMAL: |
| 762 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 763 | if (!msg) |
| 764 | break; |
| 765 | |
| 766 | if (result < 0) |
| 767 | return_hosed_msg(ssif_info, msg); |
| 768 | else |
| 769 | deliver_recv_msg(ssif_info, msg); |
| 770 | break; |
| 771 | |
| 772 | case SSIF_GETTING_FLAGS: |
| 773 | /* We got the flags from the SSIF, now handle them. */ |
| 774 | if ((result < 0) || (len < 4) || (data[2] != 0)) { |
| 775 | /* |
| 776 | * Error fetching flags, or invalid length, |
| 777 | * just give up for now. |
| 778 | */ |
| 779 | ssif_info->ssif_state = SSIF_NORMAL; |
| 780 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 781 | pr_warn(PFX "Error getting flags: %d %d, %x\n", |
Kamlakant Patel | b4cc441 | 2018-03-13 16:32:27 +0530 | [diff] [blame] | 782 | result, len, (len >= 3) ? data[2] : 0); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 783 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 |
| 784 | || data[1] != IPMI_GET_MSG_FLAGS_CMD) { |
Corey Minyard | 1b9008c | 2017-06-30 07:18:08 -0500 | [diff] [blame] | 785 | /* |
| 786 | * Don't abort here, maybe it was a queued |
| 787 | * response to a previous command. |
| 788 | */ |
| 789 | ipmi_ssif_unlock_cond(ssif_info, flags); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 790 | pr_warn(PFX "Invalid response getting flags: %x %x\n", |
| 791 | data[0], data[1]); |
| 792 | } else { |
| 793 | ssif_inc_stat(ssif_info, flag_fetches); |
| 794 | ssif_info->msg_flags = data[3]; |
| 795 | handle_flags(ssif_info, flags); |
| 796 | } |
| 797 | break; |
| 798 | |
| 799 | case SSIF_CLEARING_FLAGS: |
| 800 | /* We cleared the flags. */ |
| 801 | if ((result < 0) || (len < 3) || (data[2] != 0)) { |
| 802 | /* Error clearing flags */ |
| 803 | pr_warn(PFX "Error clearing flags: %d %d, %x\n", |
Kamlakant Patel | b4cc441 | 2018-03-13 16:32:27 +0530 | [diff] [blame] | 804 | result, len, (len >= 3) ? data[2] : 0); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 805 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 |
| 806 | || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) { |
| 807 | pr_warn(PFX "Invalid response clearing flags: %x %x\n", |
| 808 | data[0], data[1]); |
| 809 | } |
| 810 | ssif_info->ssif_state = SSIF_NORMAL; |
| 811 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 812 | break; |
| 813 | |
| 814 | case SSIF_GETTING_EVENTS: |
| 815 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { |
| 816 | /* Error getting event, probably done. */ |
| 817 | msg->done(msg); |
| 818 | |
| 819 | /* Take off the event flag. */ |
| 820 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; |
| 821 | handle_flags(ssif_info, flags); |
| 822 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 |
| 823 | || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) { |
| 824 | pr_warn(PFX "Invalid response getting events: %x %x\n", |
| 825 | msg->rsp[0], msg->rsp[1]); |
| 826 | msg->done(msg); |
| 827 | /* Take off the event flag. */ |
| 828 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; |
| 829 | handle_flags(ssif_info, flags); |
| 830 | } else { |
| 831 | handle_flags(ssif_info, flags); |
| 832 | ssif_inc_stat(ssif_info, events); |
| 833 | deliver_recv_msg(ssif_info, msg); |
| 834 | } |
| 835 | break; |
| 836 | |
| 837 | case SSIF_GETTING_MESSAGES: |
| 838 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { |
| 839 | /* Error getting event, probably done. */ |
| 840 | msg->done(msg); |
| 841 | |
| 842 | /* Take off the msg flag. */ |
| 843 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; |
| 844 | handle_flags(ssif_info, flags); |
| 845 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 |
| 846 | || msg->rsp[1] != IPMI_GET_MSG_CMD) { |
| 847 | pr_warn(PFX "Invalid response clearing flags: %x %x\n", |
| 848 | msg->rsp[0], msg->rsp[1]); |
| 849 | msg->done(msg); |
| 850 | |
| 851 | /* Take off the msg flag. */ |
| 852 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; |
| 853 | handle_flags(ssif_info, flags); |
| 854 | } else { |
| 855 | ssif_inc_stat(ssif_info, incoming_messages); |
| 856 | handle_flags(ssif_info, flags); |
| 857 | deliver_recv_msg(ssif_info, msg); |
| 858 | } |
| 859 | break; |
| 860 | } |
| 861 | |
| 862 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 863 | if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) { |
| 864 | if (ssif_info->req_events) |
| 865 | start_event_fetch(ssif_info, flags); |
| 866 | else if (ssif_info->req_flags) |
| 867 | start_flag_fetch(ssif_info, flags); |
| 868 | else |
| 869 | start_next_msg(ssif_info, flags); |
| 870 | } else |
| 871 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 872 | |
| 873 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) |
| 874 | pr_info(PFX "DONE 2: state = %d.\n", ssif_info->ssif_state); |
| 875 | } |
| 876 | |
| 877 | static void msg_written_handler(struct ssif_info *ssif_info, int result, |
| 878 | unsigned char *data, unsigned int len) |
| 879 | { |
| 880 | int rv; |
| 881 | |
| 882 | /* We are single-threaded here, so no need for a lock. */ |
| 883 | if (result < 0) { |
| 884 | ssif_info->retries_left--; |
| 885 | if (ssif_info->retries_left > 0) { |
| 886 | if (!start_resend(ssif_info)) { |
| 887 | ssif_inc_stat(ssif_info, send_retries); |
| 888 | return; |
| 889 | } |
| 890 | /* request failed, just return the error. */ |
| 891 | ssif_inc_stat(ssif_info, send_errors); |
| 892 | |
| 893 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 894 | pr_info(PFX |
| 895 | "Out of retries in msg_written_handler\n"); |
| 896 | msg_done_handler(ssif_info, -EIO, NULL, 0); |
| 897 | return; |
| 898 | } |
| 899 | |
| 900 | ssif_inc_stat(ssif_info, send_errors); |
| 901 | |
| 902 | /* |
| 903 | * Got an error on transmit, let the done routine |
| 904 | * handle it. |
| 905 | */ |
| 906 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 907 | pr_info("Error in msg_written_handler: %d\n", result); |
| 908 | |
| 909 | msg_done_handler(ssif_info, result, NULL, 0); |
| 910 | return; |
| 911 | } |
| 912 | |
| 913 | if (ssif_info->multi_data) { |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 914 | /* |
| 915 | * In the middle of a multi-data write. See the comment |
| 916 | * in the SSIF_MULTI_n_PART case in the probe function |
| 917 | * for details on the intricacies of this. |
| 918 | */ |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 919 | int left; |
Joeseph Chang | 46ba11b | 2017-03-27 20:22:09 -0600 | [diff] [blame] | 920 | unsigned char *data_to_send; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 921 | |
| 922 | ssif_inc_stat(ssif_info, sent_messages_parts); |
| 923 | |
| 924 | left = ssif_info->multi_len - ssif_info->multi_pos; |
| 925 | if (left > 32) |
| 926 | left = 32; |
| 927 | /* Length byte. */ |
| 928 | ssif_info->multi_data[ssif_info->multi_pos] = left; |
Joeseph Chang | 46ba11b | 2017-03-27 20:22:09 -0600 | [diff] [blame] | 929 | data_to_send = ssif_info->multi_data + ssif_info->multi_pos; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 930 | ssif_info->multi_pos += left; |
| 931 | if (left < 32) |
| 932 | /* |
| 933 | * Write is finished. Note that we must end |
| 934 | * with a write of less than 32 bytes to |
| 935 | * complete the transaction, even if it is |
| 936 | * zero bytes. |
| 937 | */ |
| 938 | ssif_info->multi_data = NULL; |
| 939 | |
| 940 | rv = ssif_i2c_send(ssif_info, msg_written_handler, |
| 941 | I2C_SMBUS_WRITE, |
| 942 | SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, |
Joeseph Chang | 46ba11b | 2017-03-27 20:22:09 -0600 | [diff] [blame] | 943 | data_to_send, |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 944 | I2C_SMBUS_BLOCK_DATA); |
| 945 | if (rv < 0) { |
| 946 | /* request failed, just return the error. */ |
| 947 | ssif_inc_stat(ssif_info, send_errors); |
| 948 | |
| 949 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
| 950 | pr_info("Error from i2c_non_blocking_op(3)\n"); |
| 951 | msg_done_handler(ssif_info, -EIO, NULL, 0); |
| 952 | } |
| 953 | } else { |
Corey Minyard | 21c8f91 | 2016-01-06 09:32:06 -0600 | [diff] [blame] | 954 | /* Ready to request the result. */ |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 955 | unsigned long oflags, *flags; |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 956 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 957 | ssif_inc_stat(ssif_info, sent_messages); |
| 958 | ssif_inc_stat(ssif_info, sent_messages_parts); |
| 959 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 960 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
Corey Minyard | 21c8f91 | 2016-01-06 09:32:06 -0600 | [diff] [blame] | 961 | if (ssif_info->got_alert) { |
| 962 | /* The result is already ready, just start it. */ |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 963 | ssif_info->got_alert = false; |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 964 | ipmi_ssif_unlock_cond(ssif_info, flags); |
Corey Minyard | 21c8f91 | 2016-01-06 09:32:06 -0600 | [diff] [blame] | 965 | start_get(ssif_info); |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 966 | } else { |
| 967 | /* Wait a jiffie then request the next message */ |
| 968 | ssif_info->waiting_alert = true; |
| 969 | ssif_info->retries_left = SSIF_RECV_RETRIES; |
| 970 | ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC; |
Jan Glauber | 9aba7dd | 2018-10-11 12:13:01 +0200 | [diff] [blame] | 971 | if (!ssif_info->stopping) |
| 972 | mod_timer(&ssif_info->retry_timer, |
| 973 | jiffies + SSIF_MSG_PART_JIFFIES); |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 974 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 975 | } |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 976 | } |
| 977 | } |
| 978 | |
| 979 | static int start_resend(struct ssif_info *ssif_info) |
| 980 | { |
| 981 | int rv; |
| 982 | int command; |
| 983 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 984 | ssif_info->got_alert = false; |
| 985 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 986 | if (ssif_info->data_len > 32) { |
| 987 | command = SSIF_IPMI_MULTI_PART_REQUEST_START; |
| 988 | ssif_info->multi_data = ssif_info->data; |
| 989 | ssif_info->multi_len = ssif_info->data_len; |
| 990 | /* |
| 991 | * Subtle thing, this is 32, not 33, because we will |
| 992 | * overwrite the thing at position 32 (which was just |
| 993 | * transmitted) with the new length. |
| 994 | */ |
| 995 | ssif_info->multi_pos = 32; |
| 996 | ssif_info->data[0] = 32; |
| 997 | } else { |
| 998 | ssif_info->multi_data = NULL; |
| 999 | command = SSIF_IPMI_REQUEST; |
| 1000 | ssif_info->data[0] = ssif_info->data_len; |
| 1001 | } |
| 1002 | |
| 1003 | rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE, |
| 1004 | command, ssif_info->data, I2C_SMBUS_BLOCK_DATA); |
| 1005 | if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG)) |
| 1006 | pr_info("Error from i2c_non_blocking_op(4)\n"); |
| 1007 | return rv; |
| 1008 | } |
| 1009 | |
| 1010 | static int start_send(struct ssif_info *ssif_info, |
| 1011 | unsigned char *data, |
| 1012 | unsigned int len) |
| 1013 | { |
| 1014 | if (len > IPMI_MAX_MSG_LENGTH) |
| 1015 | return -E2BIG; |
| 1016 | if (len > ssif_info->max_xmit_msg_size) |
| 1017 | return -E2BIG; |
| 1018 | |
| 1019 | ssif_info->retries_left = SSIF_SEND_RETRIES; |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 1020 | memcpy(ssif_info->data + 1, data, len); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1021 | ssif_info->data_len = len; |
| 1022 | return start_resend(ssif_info); |
| 1023 | } |
| 1024 | |
| 1025 | /* Must be called with the message lock held. */ |
| 1026 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags) |
| 1027 | { |
| 1028 | struct ipmi_smi_msg *msg; |
| 1029 | unsigned long oflags; |
| 1030 | |
| 1031 | restart: |
| 1032 | if (!SSIF_IDLE(ssif_info)) { |
| 1033 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 1034 | return; |
| 1035 | } |
| 1036 | |
| 1037 | if (!ssif_info->waiting_msg) { |
| 1038 | ssif_info->curr_msg = NULL; |
| 1039 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 1040 | } else { |
| 1041 | int rv; |
| 1042 | |
| 1043 | ssif_info->curr_msg = ssif_info->waiting_msg; |
| 1044 | ssif_info->waiting_msg = NULL; |
| 1045 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 1046 | rv = start_send(ssif_info, |
| 1047 | ssif_info->curr_msg->data, |
| 1048 | ssif_info->curr_msg->data_size); |
| 1049 | if (rv) { |
| 1050 | msg = ssif_info->curr_msg; |
| 1051 | ssif_info->curr_msg = NULL; |
| 1052 | return_hosed_msg(ssif_info, msg); |
| 1053 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 1054 | goto restart; |
| 1055 | } |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | static void sender(void *send_info, |
| 1060 | struct ipmi_smi_msg *msg) |
| 1061 | { |
| 1062 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; |
| 1063 | unsigned long oflags, *flags; |
| 1064 | |
| 1065 | BUG_ON(ssif_info->waiting_msg); |
| 1066 | ssif_info->waiting_msg = msg; |
| 1067 | |
| 1068 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 1069 | start_next_msg(ssif_info, flags); |
| 1070 | |
| 1071 | if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) { |
Amitoj Kaur Chawla | 526290a | 2015-10-24 01:21:04 +0530 | [diff] [blame] | 1072 | struct timespec64 t; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1073 | |
Amitoj Kaur Chawla | 526290a | 2015-10-24 01:21:04 +0530 | [diff] [blame] | 1074 | ktime_get_real_ts64(&t); |
| 1075 | pr_info("**Enqueue %02x %02x: %lld.%6.6ld\n", |
Corey Minyard | 1421c93 | 2014-12-30 13:31:45 -0600 | [diff] [blame] | 1076 | msg->data[0], msg->data[1], |
Amitoj Kaur Chawla | 526290a | 2015-10-24 01:21:04 +0530 | [diff] [blame] | 1077 | (long long) t.tv_sec, (long) t.tv_nsec / NSEC_PER_USEC); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1078 | } |
| 1079 | } |
| 1080 | |
| 1081 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) |
| 1082 | { |
| 1083 | struct ssif_info *ssif_info = send_info; |
| 1084 | |
| 1085 | data->addr_src = ssif_info->addr_source; |
| 1086 | data->dev = &ssif_info->client->dev; |
| 1087 | data->addr_info = ssif_info->addr_info; |
| 1088 | get_device(data->dev); |
| 1089 | |
| 1090 | return 0; |
| 1091 | } |
| 1092 | |
| 1093 | /* |
| 1094 | * Instead of having our own timer to periodically check the message |
| 1095 | * flags, we let the message handler drive us. |
| 1096 | */ |
| 1097 | static void request_events(void *send_info) |
| 1098 | { |
| 1099 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; |
| 1100 | unsigned long oflags, *flags; |
| 1101 | |
| 1102 | if (!ssif_info->has_event_buffer) |
| 1103 | return; |
| 1104 | |
| 1105 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| 1106 | /* |
| 1107 | * Request flags first, not events, because the lower layer |
| 1108 | * doesn't have a way to send an attention. But make sure |
| 1109 | * event checking still happens. |
| 1110 | */ |
| 1111 | ssif_info->req_events = true; |
| 1112 | if (SSIF_IDLE(ssif_info)) |
| 1113 | start_flag_fetch(ssif_info, flags); |
| 1114 | else { |
| 1115 | ssif_info->req_flags = true; |
| 1116 | ipmi_ssif_unlock_cond(ssif_info, flags); |
| 1117 | } |
| 1118 | } |
| 1119 | |
| 1120 | static int inc_usecount(void *send_info) |
| 1121 | { |
| 1122 | struct ssif_info *ssif_info = send_info; |
| 1123 | |
| 1124 | if (!i2c_get_adapter(ssif_info->client->adapter->nr)) |
| 1125 | return -ENODEV; |
| 1126 | |
| 1127 | i2c_use_client(ssif_info->client); |
| 1128 | return 0; |
| 1129 | } |
| 1130 | |
| 1131 | static void dec_usecount(void *send_info) |
| 1132 | { |
| 1133 | struct ssif_info *ssif_info = send_info; |
| 1134 | |
| 1135 | i2c_release_client(ssif_info->client); |
| 1136 | i2c_put_adapter(ssif_info->client->adapter); |
| 1137 | } |
| 1138 | |
| 1139 | static int ssif_start_processing(void *send_info, |
| 1140 | ipmi_smi_t intf) |
| 1141 | { |
| 1142 | struct ssif_info *ssif_info = send_info; |
| 1143 | |
| 1144 | ssif_info->intf = intf; |
| 1145 | |
| 1146 | return 0; |
| 1147 | } |
| 1148 | |
| 1149 | #define MAX_SSIF_BMCS 4 |
| 1150 | |
| 1151 | static unsigned short addr[MAX_SSIF_BMCS]; |
| 1152 | static int num_addrs; |
| 1153 | module_param_array(addr, ushort, &num_addrs, 0); |
| 1154 | MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs."); |
| 1155 | |
| 1156 | static char *adapter_name[MAX_SSIF_BMCS]; |
| 1157 | static int num_adapter_names; |
| 1158 | module_param_array(adapter_name, charp, &num_adapter_names, 0); |
| 1159 | MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned."); |
| 1160 | |
| 1161 | static int slave_addrs[MAX_SSIF_BMCS]; |
| 1162 | static int num_slave_addrs; |
| 1163 | module_param_array(slave_addrs, int, &num_slave_addrs, 0); |
| 1164 | MODULE_PARM_DESC(slave_addrs, |
| 1165 | "The default IPMB slave address for the controller."); |
| 1166 | |
Corey Minyard | bf2d087 | 2015-08-27 15:49:18 -0500 | [diff] [blame] | 1167 | static bool alerts_broken; |
| 1168 | module_param(alerts_broken, bool, 0); |
| 1169 | MODULE_PARM_DESC(alerts_broken, "Don't enable alerts for the controller."); |
| 1170 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1171 | /* |
| 1172 | * Bit 0 enables message debugging, bit 1 enables state debugging, and |
| 1173 | * bit 2 enables timing debugging. This is an array indexed by |
| 1174 | * interface number" |
| 1175 | */ |
| 1176 | static int dbg[MAX_SSIF_BMCS]; |
| 1177 | static int num_dbg; |
| 1178 | module_param_array(dbg, int, &num_dbg, 0); |
| 1179 | MODULE_PARM_DESC(dbg, "Turn on debugging."); |
| 1180 | |
| 1181 | static bool ssif_dbg_probe; |
| 1182 | module_param_named(dbg_probe, ssif_dbg_probe, bool, 0); |
| 1183 | MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters."); |
| 1184 | |
| 1185 | static int use_thread; |
| 1186 | module_param(use_thread, int, 0); |
| 1187 | MODULE_PARM_DESC(use_thread, "Use the thread interface."); |
| 1188 | |
Shailendra Verma | fedb25e | 2015-05-26 00:54:57 +0530 | [diff] [blame] | 1189 | static bool ssif_tryacpi = true; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1190 | module_param_named(tryacpi, ssif_tryacpi, bool, 0); |
| 1191 | MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI"); |
| 1192 | |
Shailendra Verma | fedb25e | 2015-05-26 00:54:57 +0530 | [diff] [blame] | 1193 | static bool ssif_trydmi = true; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1194 | module_param_named(trydmi, ssif_trydmi, bool, 0); |
| 1195 | MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)"); |
| 1196 | |
| 1197 | static DEFINE_MUTEX(ssif_infos_mutex); |
| 1198 | static LIST_HEAD(ssif_infos); |
| 1199 | |
| 1200 | static int ssif_remove(struct i2c_client *client) |
| 1201 | { |
| 1202 | struct ssif_info *ssif_info = i2c_get_clientdata(client); |
| 1203 | int rv; |
| 1204 | |
| 1205 | if (!ssif_info) |
| 1206 | return 0; |
| 1207 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1208 | /* |
| 1209 | * After this point, we won't deliver anything asychronously |
| 1210 | * to the message handler. We can unregister ourself. |
| 1211 | */ |
| 1212 | rv = ipmi_unregister_smi(ssif_info->intf); |
| 1213 | if (rv) { |
| 1214 | pr_err(PFX "Unable to unregister device: errno=%d\n", rv); |
| 1215 | return rv; |
| 1216 | } |
| 1217 | ssif_info->intf = NULL; |
| 1218 | |
| 1219 | /* make sure the driver is not looking for flags any more. */ |
| 1220 | while (ssif_info->ssif_state != SSIF_NORMAL) |
| 1221 | schedule_timeout(1); |
| 1222 | |
| 1223 | ssif_info->stopping = true; |
| 1224 | del_timer_sync(&ssif_info->retry_timer); |
| 1225 | if (ssif_info->thread) { |
| 1226 | complete(&ssif_info->wake_thread); |
| 1227 | kthread_stop(ssif_info->thread); |
| 1228 | } |
| 1229 | |
| 1230 | /* |
| 1231 | * No message can be outstanding now, we have removed the |
| 1232 | * upper layer and it permitted us to do so. |
| 1233 | */ |
| 1234 | kfree(ssif_info); |
| 1235 | return 0; |
| 1236 | } |
| 1237 | |
| 1238 | static int do_cmd(struct i2c_client *client, int len, unsigned char *msg, |
| 1239 | int *resp_len, unsigned char *resp) |
| 1240 | { |
| 1241 | int retry_cnt; |
| 1242 | int ret; |
| 1243 | |
| 1244 | retry_cnt = SSIF_SEND_RETRIES; |
| 1245 | retry1: |
| 1246 | ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg); |
| 1247 | if (ret) { |
| 1248 | retry_cnt--; |
| 1249 | if (retry_cnt > 0) |
| 1250 | goto retry1; |
| 1251 | return -ENODEV; |
| 1252 | } |
| 1253 | |
| 1254 | ret = -ENODEV; |
| 1255 | retry_cnt = SSIF_RECV_RETRIES; |
| 1256 | while (retry_cnt > 0) { |
| 1257 | ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE, |
| 1258 | resp); |
| 1259 | if (ret > 0) |
| 1260 | break; |
| 1261 | msleep(SSIF_MSG_MSEC); |
| 1262 | retry_cnt--; |
| 1263 | if (retry_cnt <= 0) |
| 1264 | break; |
| 1265 | } |
| 1266 | |
| 1267 | if (ret > 0) { |
| 1268 | /* Validate that the response is correct. */ |
| 1269 | if (ret < 3 || |
| 1270 | (resp[0] != (msg[0] | (1 << 2))) || |
| 1271 | (resp[1] != msg[1])) |
| 1272 | ret = -EINVAL; |
| 1273 | else { |
| 1274 | *resp_len = ret; |
| 1275 | ret = 0; |
| 1276 | } |
| 1277 | } |
| 1278 | |
| 1279 | return ret; |
| 1280 | } |
| 1281 | |
| 1282 | static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info) |
| 1283 | { |
| 1284 | unsigned char *resp; |
| 1285 | unsigned char msg[3]; |
| 1286 | int rv; |
| 1287 | int len; |
| 1288 | |
| 1289 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
| 1290 | if (!resp) |
| 1291 | return -ENOMEM; |
| 1292 | |
| 1293 | /* Do a Get Device ID command, since it is required. */ |
| 1294 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
| 1295 | msg[1] = IPMI_GET_DEVICE_ID_CMD; |
| 1296 | rv = do_cmd(client, 2, msg, &len, resp); |
| 1297 | if (rv) |
| 1298 | rv = -ENODEV; |
| 1299 | else |
| 1300 | strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE); |
| 1301 | kfree(resp); |
| 1302 | return rv; |
| 1303 | } |
| 1304 | |
| 1305 | static int smi_type_proc_show(struct seq_file *m, void *v) |
| 1306 | { |
Joe Perches | d6c5dc1 | 2015-02-17 11:10:56 -0800 | [diff] [blame] | 1307 | seq_puts(m, "ssif\n"); |
| 1308 | |
Joe Perches | 5e33cd0 | 2015-02-22 10:21:07 -0800 | [diff] [blame] | 1309 | return 0; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1310 | } |
| 1311 | |
| 1312 | static int smi_type_proc_open(struct inode *inode, struct file *file) |
| 1313 | { |
| 1314 | return single_open(file, smi_type_proc_show, inode->i_private); |
| 1315 | } |
| 1316 | |
| 1317 | static const struct file_operations smi_type_proc_ops = { |
| 1318 | .open = smi_type_proc_open, |
| 1319 | .read = seq_read, |
| 1320 | .llseek = seq_lseek, |
| 1321 | .release = single_release, |
| 1322 | }; |
| 1323 | |
| 1324 | static int smi_stats_proc_show(struct seq_file *m, void *v) |
| 1325 | { |
| 1326 | struct ssif_info *ssif_info = m->private; |
| 1327 | |
| 1328 | seq_printf(m, "sent_messages: %u\n", |
| 1329 | ssif_get_stat(ssif_info, sent_messages)); |
| 1330 | seq_printf(m, "sent_messages_parts: %u\n", |
| 1331 | ssif_get_stat(ssif_info, sent_messages_parts)); |
| 1332 | seq_printf(m, "send_retries: %u\n", |
| 1333 | ssif_get_stat(ssif_info, send_retries)); |
| 1334 | seq_printf(m, "send_errors: %u\n", |
| 1335 | ssif_get_stat(ssif_info, send_errors)); |
| 1336 | seq_printf(m, "received_messages: %u\n", |
| 1337 | ssif_get_stat(ssif_info, received_messages)); |
| 1338 | seq_printf(m, "received_message_parts: %u\n", |
| 1339 | ssif_get_stat(ssif_info, received_message_parts)); |
| 1340 | seq_printf(m, "receive_retries: %u\n", |
| 1341 | ssif_get_stat(ssif_info, receive_retries)); |
| 1342 | seq_printf(m, "receive_errors: %u\n", |
| 1343 | ssif_get_stat(ssif_info, receive_errors)); |
| 1344 | seq_printf(m, "flag_fetches: %u\n", |
| 1345 | ssif_get_stat(ssif_info, flag_fetches)); |
| 1346 | seq_printf(m, "hosed: %u\n", |
| 1347 | ssif_get_stat(ssif_info, hosed)); |
| 1348 | seq_printf(m, "events: %u\n", |
| 1349 | ssif_get_stat(ssif_info, events)); |
| 1350 | seq_printf(m, "watchdog_pretimeouts: %u\n", |
| 1351 | ssif_get_stat(ssif_info, watchdog_pretimeouts)); |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1352 | seq_printf(m, "alerts: %u\n", |
| 1353 | ssif_get_stat(ssif_info, alerts)); |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1354 | return 0; |
| 1355 | } |
| 1356 | |
| 1357 | static int smi_stats_proc_open(struct inode *inode, struct file *file) |
| 1358 | { |
| 1359 | return single_open(file, smi_stats_proc_show, PDE_DATA(inode)); |
| 1360 | } |
| 1361 | |
| 1362 | static const struct file_operations smi_stats_proc_ops = { |
| 1363 | .open = smi_stats_proc_open, |
| 1364 | .read = seq_read, |
| 1365 | .llseek = seq_lseek, |
| 1366 | .release = single_release, |
| 1367 | }; |
| 1368 | |
Corey Minyard | b0e9aaa | 2015-03-31 12:48:53 -0500 | [diff] [blame] | 1369 | static int strcmp_nospace(char *s1, char *s2) |
| 1370 | { |
| 1371 | while (*s1 && *s2) { |
| 1372 | while (isspace(*s1)) |
| 1373 | s1++; |
| 1374 | while (isspace(*s2)) |
| 1375 | s2++; |
| 1376 | if (*s1 > *s2) |
| 1377 | return 1; |
| 1378 | if (*s1 < *s2) |
| 1379 | return -1; |
| 1380 | s1++; |
| 1381 | s2++; |
| 1382 | } |
| 1383 | return 0; |
| 1384 | } |
| 1385 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1386 | static struct ssif_addr_info *ssif_info_find(unsigned short addr, |
| 1387 | char *adapter_name, |
| 1388 | bool match_null_name) |
| 1389 | { |
| 1390 | struct ssif_addr_info *info, *found = NULL; |
| 1391 | |
| 1392 | restart: |
| 1393 | list_for_each_entry(info, &ssif_infos, link) { |
| 1394 | if (info->binfo.addr == addr) { |
| 1395 | if (info->adapter_name || adapter_name) { |
| 1396 | if (!info->adapter_name != !adapter_name) { |
| 1397 | /* One is NULL and one is not */ |
| 1398 | continue; |
| 1399 | } |
Corey Minyard | b0e9aaa | 2015-03-31 12:48:53 -0500 | [diff] [blame] | 1400 | if (adapter_name && |
| 1401 | strcmp_nospace(info->adapter_name, |
| 1402 | adapter_name)) |
| 1403 | /* Names do not match */ |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1404 | continue; |
| 1405 | } |
| 1406 | found = info; |
| 1407 | break; |
| 1408 | } |
| 1409 | } |
| 1410 | |
| 1411 | if (!found && match_null_name) { |
| 1412 | /* Try to get an exact match first, then try with a NULL name */ |
| 1413 | adapter_name = NULL; |
| 1414 | match_null_name = false; |
| 1415 | goto restart; |
| 1416 | } |
| 1417 | |
| 1418 | return found; |
| 1419 | } |
| 1420 | |
| 1421 | static bool check_acpi(struct ssif_info *ssif_info, struct device *dev) |
| 1422 | { |
| 1423 | #ifdef CONFIG_ACPI |
| 1424 | acpi_handle acpi_handle; |
| 1425 | |
| 1426 | acpi_handle = ACPI_HANDLE(dev); |
| 1427 | if (acpi_handle) { |
| 1428 | ssif_info->addr_source = SI_ACPI; |
| 1429 | ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle; |
| 1430 | return true; |
| 1431 | } |
| 1432 | #endif |
| 1433 | return false; |
| 1434 | } |
| 1435 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1436 | /* |
| 1437 | * Global enables we care about. |
| 1438 | */ |
| 1439 | #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ |
| 1440 | IPMI_BMC_EVT_MSG_INTR) |
| 1441 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1442 | static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id) |
| 1443 | { |
| 1444 | unsigned char msg[3]; |
| 1445 | unsigned char *resp; |
| 1446 | struct ssif_info *ssif_info; |
| 1447 | int rv = 0; |
| 1448 | int len; |
| 1449 | int i; |
| 1450 | u8 slave_addr = 0; |
| 1451 | struct ssif_addr_info *addr_info = NULL; |
| 1452 | |
| 1453 | |
| 1454 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
| 1455 | if (!resp) |
| 1456 | return -ENOMEM; |
| 1457 | |
| 1458 | ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL); |
| 1459 | if (!ssif_info) { |
| 1460 | kfree(resp); |
| 1461 | return -ENOMEM; |
| 1462 | } |
| 1463 | |
| 1464 | if (!check_acpi(ssif_info, &client->dev)) { |
| 1465 | addr_info = ssif_info_find(client->addr, client->adapter->name, |
| 1466 | true); |
| 1467 | if (!addr_info) { |
| 1468 | /* Must have come in through sysfs. */ |
| 1469 | ssif_info->addr_source = SI_HOTMOD; |
| 1470 | } else { |
| 1471 | ssif_info->addr_source = addr_info->addr_src; |
| 1472 | ssif_info->ssif_debug = addr_info->debug; |
| 1473 | ssif_info->addr_info = addr_info->addr_info; |
| 1474 | slave_addr = addr_info->slave_addr; |
| 1475 | } |
| 1476 | } |
| 1477 | |
| 1478 | pr_info(PFX "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n", |
| 1479 | ipmi_addr_src_to_str(ssif_info->addr_source), |
| 1480 | client->addr, client->adapter->name, slave_addr); |
| 1481 | |
| 1482 | /* |
| 1483 | * Do a Get Device ID command, since it comes back with some |
| 1484 | * useful info. |
| 1485 | */ |
| 1486 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
| 1487 | msg[1] = IPMI_GET_DEVICE_ID_CMD; |
| 1488 | rv = do_cmd(client, 2, msg, &len, resp); |
| 1489 | if (rv) |
| 1490 | goto out; |
| 1491 | |
| 1492 | rv = ipmi_demangle_device_id(resp, len, &ssif_info->device_id); |
| 1493 | if (rv) |
| 1494 | goto out; |
| 1495 | |
| 1496 | ssif_info->client = client; |
| 1497 | i2c_set_clientdata(client, ssif_info); |
| 1498 | |
| 1499 | /* Now check for system interface capabilities */ |
| 1500 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
| 1501 | msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD; |
| 1502 | msg[2] = 0; /* SSIF */ |
| 1503 | rv = do_cmd(client, 3, msg, &len, resp); |
| 1504 | if (!rv && (len >= 3) && (resp[2] == 0)) { |
| 1505 | if (len < 7) { |
| 1506 | if (ssif_dbg_probe) |
| 1507 | pr_info(PFX "SSIF info too short: %d\n", len); |
| 1508 | goto no_support; |
| 1509 | } |
| 1510 | |
| 1511 | /* Got a good SSIF response, handle it. */ |
| 1512 | ssif_info->max_xmit_msg_size = resp[5]; |
| 1513 | ssif_info->max_recv_msg_size = resp[6]; |
| 1514 | ssif_info->multi_support = (resp[4] >> 6) & 0x3; |
| 1515 | ssif_info->supports_pec = (resp[4] >> 3) & 0x1; |
| 1516 | |
| 1517 | /* Sanitize the data */ |
| 1518 | switch (ssif_info->multi_support) { |
| 1519 | case SSIF_NO_MULTI: |
| 1520 | if (ssif_info->max_xmit_msg_size > 32) |
| 1521 | ssif_info->max_xmit_msg_size = 32; |
| 1522 | if (ssif_info->max_recv_msg_size > 32) |
| 1523 | ssif_info->max_recv_msg_size = 32; |
| 1524 | break; |
| 1525 | |
| 1526 | case SSIF_MULTI_2_PART: |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 1527 | if (ssif_info->max_xmit_msg_size > 63) |
| 1528 | ssif_info->max_xmit_msg_size = 63; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1529 | if (ssif_info->max_recv_msg_size > 62) |
| 1530 | ssif_info->max_recv_msg_size = 62; |
| 1531 | break; |
| 1532 | |
| 1533 | case SSIF_MULTI_n_PART: |
Corey Minyard | 3d69d43 | 2015-04-29 17:59:21 -0500 | [diff] [blame] | 1534 | /* |
| 1535 | * The specification is rather confusing at |
| 1536 | * this point, but I think I understand what |
| 1537 | * is meant. At least I have a workable |
| 1538 | * solution. With multi-part messages, you |
| 1539 | * cannot send a message that is a multiple of |
| 1540 | * 32-bytes in length, because the start and |
| 1541 | * middle messages are 32-bytes and the end |
| 1542 | * message must be at least one byte. You |
| 1543 | * can't fudge on an extra byte, that would |
| 1544 | * screw up things like fru data writes. So |
| 1545 | * we limit the length to 63 bytes. That way |
| 1546 | * a 32-byte message gets sent as a single |
| 1547 | * part. A larger message will be a 32-byte |
| 1548 | * start and the next message is always going |
| 1549 | * to be 1-31 bytes in length. Not ideal, but |
| 1550 | * it should work. |
| 1551 | */ |
| 1552 | if (ssif_info->max_xmit_msg_size > 63) |
| 1553 | ssif_info->max_xmit_msg_size = 63; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1554 | break; |
| 1555 | |
| 1556 | default: |
| 1557 | /* Data is not sane, just give up. */ |
| 1558 | goto no_support; |
| 1559 | } |
| 1560 | } else { |
| 1561 | no_support: |
| 1562 | /* Assume no multi-part or PEC support */ |
Corey Minyard | b0e9aaa | 2015-03-31 12:48:53 -0500 | [diff] [blame] | 1563 | pr_info(PFX "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n", |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1564 | rv, len, resp[2]); |
| 1565 | |
| 1566 | ssif_info->max_xmit_msg_size = 32; |
| 1567 | ssif_info->max_recv_msg_size = 32; |
| 1568 | ssif_info->multi_support = SSIF_NO_MULTI; |
| 1569 | ssif_info->supports_pec = 0; |
| 1570 | } |
| 1571 | |
| 1572 | /* Make sure the NMI timeout is cleared. */ |
| 1573 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
| 1574 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; |
| 1575 | msg[2] = WDT_PRE_TIMEOUT_INT; |
| 1576 | rv = do_cmd(client, 3, msg, &len, resp); |
| 1577 | if (rv || (len < 3) || (resp[2] != 0)) |
| 1578 | pr_warn(PFX "Unable to clear message flags: %d %d %2.2x\n", |
| 1579 | rv, len, resp[2]); |
| 1580 | |
| 1581 | /* Attempt to enable the event buffer. */ |
| 1582 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
| 1583 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; |
| 1584 | rv = do_cmd(client, 2, msg, &len, resp); |
| 1585 | if (rv || (len < 4) || (resp[2] != 0)) { |
| 1586 | pr_warn(PFX "Error getting global enables: %d %d %2.2x\n", |
| 1587 | rv, len, resp[2]); |
| 1588 | rv = 0; /* Not fatal */ |
| 1589 | goto found; |
| 1590 | } |
| 1591 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1592 | ssif_info->global_enables = resp[3]; |
| 1593 | |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1594 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
| 1595 | ssif_info->has_event_buffer = true; |
| 1596 | /* buffer is already enabled, nothing to do. */ |
| 1597 | goto found; |
| 1598 | } |
| 1599 | |
| 1600 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
| 1601 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1602 | msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1603 | rv = do_cmd(client, 3, msg, &len, resp); |
| 1604 | if (rv || (len < 2)) { |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1605 | pr_warn(PFX "Error setting global enables: %d %d %2.2x\n", |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1606 | rv, len, resp[2]); |
| 1607 | rv = 0; /* Not fatal */ |
| 1608 | goto found; |
| 1609 | } |
| 1610 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1611 | if (resp[2] == 0) { |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1612 | /* A successful return means the event buffer is supported. */ |
| 1613 | ssif_info->has_event_buffer = true; |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1614 | ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF; |
| 1615 | } |
| 1616 | |
Corey Minyard | bf2d087 | 2015-08-27 15:49:18 -0500 | [diff] [blame] | 1617 | /* Some systems don't behave well if you enable alerts. */ |
| 1618 | if (alerts_broken) |
| 1619 | goto found; |
| 1620 | |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1621 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
| 1622 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; |
| 1623 | msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR; |
| 1624 | rv = do_cmd(client, 3, msg, &len, resp); |
| 1625 | if (rv || (len < 2)) { |
| 1626 | pr_warn(PFX "Error setting global enables: %d %d %2.2x\n", |
| 1627 | rv, len, resp[2]); |
| 1628 | rv = 0; /* Not fatal */ |
| 1629 | goto found; |
| 1630 | } |
| 1631 | |
| 1632 | if (resp[2] == 0) { |
| 1633 | /* A successful return means the alert is supported. */ |
| 1634 | ssif_info->supports_alert = true; |
| 1635 | ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR; |
| 1636 | } |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1637 | |
| 1638 | found: |
| 1639 | ssif_info->intf_num = atomic_inc_return(&next_intf); |
| 1640 | |
| 1641 | if (ssif_dbg_probe) { |
| 1642 | pr_info("ssif_probe: i2c_probe found device at i2c address %x\n", |
| 1643 | client->addr); |
| 1644 | } |
| 1645 | |
| 1646 | spin_lock_init(&ssif_info->lock); |
| 1647 | ssif_info->ssif_state = SSIF_NORMAL; |
| 1648 | init_timer(&ssif_info->retry_timer); |
| 1649 | ssif_info->retry_timer.data = (unsigned long) ssif_info; |
| 1650 | ssif_info->retry_timer.function = retry_timeout; |
| 1651 | |
| 1652 | for (i = 0; i < SSIF_NUM_STATS; i++) |
| 1653 | atomic_set(&ssif_info->stats[i], 0); |
| 1654 | |
| 1655 | if (ssif_info->supports_pec) |
| 1656 | ssif_info->client->flags |= I2C_CLIENT_PEC; |
| 1657 | |
| 1658 | ssif_info->handlers.owner = THIS_MODULE; |
| 1659 | ssif_info->handlers.start_processing = ssif_start_processing; |
| 1660 | ssif_info->handlers.get_smi_info = get_smi_info; |
| 1661 | ssif_info->handlers.sender = sender; |
| 1662 | ssif_info->handlers.request_events = request_events; |
| 1663 | ssif_info->handlers.inc_usecount = inc_usecount; |
| 1664 | ssif_info->handlers.dec_usecount = dec_usecount; |
| 1665 | |
| 1666 | { |
| 1667 | unsigned int thread_num; |
| 1668 | |
| 1669 | thread_num = ((ssif_info->client->adapter->nr << 8) | |
| 1670 | ssif_info->client->addr); |
| 1671 | init_completion(&ssif_info->wake_thread); |
| 1672 | ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info, |
| 1673 | "kssif%4.4x", thread_num); |
| 1674 | if (IS_ERR(ssif_info->thread)) { |
| 1675 | rv = PTR_ERR(ssif_info->thread); |
| 1676 | dev_notice(&ssif_info->client->dev, |
| 1677 | "Could not start kernel thread: error %d\n", |
| 1678 | rv); |
| 1679 | goto out; |
| 1680 | } |
| 1681 | } |
| 1682 | |
| 1683 | rv = ipmi_register_smi(&ssif_info->handlers, |
| 1684 | ssif_info, |
| 1685 | &ssif_info->device_id, |
| 1686 | &ssif_info->client->dev, |
| 1687 | slave_addr); |
| 1688 | if (rv) { |
| 1689 | pr_err(PFX "Unable to register device: error %d\n", rv); |
| 1690 | goto out; |
| 1691 | } |
| 1692 | |
| 1693 | rv = ipmi_smi_add_proc_entry(ssif_info->intf, "type", |
| 1694 | &smi_type_proc_ops, |
| 1695 | ssif_info); |
| 1696 | if (rv) { |
| 1697 | pr_err(PFX "Unable to create proc entry: %d\n", rv); |
| 1698 | goto out_err_unreg; |
| 1699 | } |
| 1700 | |
| 1701 | rv = ipmi_smi_add_proc_entry(ssif_info->intf, "ssif_stats", |
| 1702 | &smi_stats_proc_ops, |
| 1703 | ssif_info); |
| 1704 | if (rv) { |
| 1705 | pr_err(PFX "Unable to create proc entry: %d\n", rv); |
| 1706 | goto out_err_unreg; |
| 1707 | } |
| 1708 | |
| 1709 | out: |
| 1710 | if (rv) |
| 1711 | kfree(ssif_info); |
| 1712 | kfree(resp); |
| 1713 | return rv; |
| 1714 | |
| 1715 | out_err_unreg: |
| 1716 | ipmi_unregister_smi(ssif_info->intf); |
| 1717 | goto out; |
| 1718 | } |
| 1719 | |
| 1720 | static int ssif_adapter_handler(struct device *adev, void *opaque) |
| 1721 | { |
| 1722 | struct ssif_addr_info *addr_info = opaque; |
| 1723 | |
| 1724 | if (adev->type != &i2c_adapter_type) |
| 1725 | return 0; |
| 1726 | |
| 1727 | i2c_new_device(to_i2c_adapter(adev), &addr_info->binfo); |
| 1728 | |
| 1729 | if (!addr_info->adapter_name) |
| 1730 | return 1; /* Only try the first I2C adapter by default. */ |
| 1731 | return 0; |
| 1732 | } |
| 1733 | |
| 1734 | static int new_ssif_client(int addr, char *adapter_name, |
| 1735 | int debug, int slave_addr, |
| 1736 | enum ipmi_addr_src addr_src) |
| 1737 | { |
| 1738 | struct ssif_addr_info *addr_info; |
| 1739 | int rv = 0; |
| 1740 | |
| 1741 | mutex_lock(&ssif_infos_mutex); |
| 1742 | if (ssif_info_find(addr, adapter_name, false)) { |
| 1743 | rv = -EEXIST; |
| 1744 | goto out_unlock; |
| 1745 | } |
| 1746 | |
| 1747 | addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL); |
| 1748 | if (!addr_info) { |
| 1749 | rv = -ENOMEM; |
| 1750 | goto out_unlock; |
| 1751 | } |
| 1752 | |
| 1753 | if (adapter_name) { |
| 1754 | addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL); |
| 1755 | if (!addr_info->adapter_name) { |
| 1756 | kfree(addr_info); |
| 1757 | rv = -ENOMEM; |
| 1758 | goto out_unlock; |
| 1759 | } |
| 1760 | } |
| 1761 | |
| 1762 | strncpy(addr_info->binfo.type, DEVICE_NAME, |
| 1763 | sizeof(addr_info->binfo.type)); |
| 1764 | addr_info->binfo.addr = addr; |
| 1765 | addr_info->binfo.platform_data = addr_info; |
| 1766 | addr_info->debug = debug; |
| 1767 | addr_info->slave_addr = slave_addr; |
| 1768 | addr_info->addr_src = addr_src; |
| 1769 | |
| 1770 | list_add_tail(&addr_info->link, &ssif_infos); |
| 1771 | |
| 1772 | if (initialized) |
| 1773 | i2c_for_each_dev(addr_info, ssif_adapter_handler); |
| 1774 | /* Otherwise address list will get it */ |
| 1775 | |
| 1776 | out_unlock: |
| 1777 | mutex_unlock(&ssif_infos_mutex); |
| 1778 | return rv; |
| 1779 | } |
| 1780 | |
| 1781 | static void free_ssif_clients(void) |
| 1782 | { |
| 1783 | struct ssif_addr_info *info, *tmp; |
| 1784 | |
| 1785 | mutex_lock(&ssif_infos_mutex); |
| 1786 | list_for_each_entry_safe(info, tmp, &ssif_infos, link) { |
| 1787 | list_del(&info->link); |
| 1788 | kfree(info->adapter_name); |
| 1789 | kfree(info); |
| 1790 | } |
| 1791 | mutex_unlock(&ssif_infos_mutex); |
| 1792 | } |
| 1793 | |
| 1794 | static unsigned short *ssif_address_list(void) |
| 1795 | { |
| 1796 | struct ssif_addr_info *info; |
| 1797 | unsigned int count = 0, i; |
| 1798 | unsigned short *address_list; |
| 1799 | |
| 1800 | list_for_each_entry(info, &ssif_infos, link) |
| 1801 | count++; |
| 1802 | |
| 1803 | address_list = kzalloc(sizeof(*address_list) * (count + 1), GFP_KERNEL); |
| 1804 | if (!address_list) |
| 1805 | return NULL; |
| 1806 | |
| 1807 | i = 0; |
| 1808 | list_for_each_entry(info, &ssif_infos, link) { |
| 1809 | unsigned short addr = info->binfo.addr; |
| 1810 | int j; |
| 1811 | |
| 1812 | for (j = 0; j < i; j++) { |
| 1813 | if (address_list[j] == addr) |
| 1814 | goto skip_addr; |
| 1815 | } |
| 1816 | address_list[i] = addr; |
| 1817 | skip_addr: |
| 1818 | i++; |
| 1819 | } |
| 1820 | address_list[i] = I2C_CLIENT_END; |
| 1821 | |
| 1822 | return address_list; |
| 1823 | } |
| 1824 | |
| 1825 | #ifdef CONFIG_ACPI |
Mathias Krause | 5186cf9 | 2015-06-13 14:19:33 +0200 | [diff] [blame] | 1826 | static const struct acpi_device_id ssif_acpi_match[] = { |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1827 | { "IPI0001", 0 }, |
| 1828 | { }, |
| 1829 | }; |
| 1830 | MODULE_DEVICE_TABLE(acpi, ssif_acpi_match); |
| 1831 | |
| 1832 | /* |
| 1833 | * Once we get an ACPI failure, we don't try any more, because we go |
| 1834 | * through the tables sequentially. Once we don't find a table, there |
| 1835 | * are no more. |
| 1836 | */ |
| 1837 | static int acpi_failure; |
| 1838 | |
| 1839 | /* |
| 1840 | * Defined in the IPMI 2.0 spec. |
| 1841 | */ |
| 1842 | struct SPMITable { |
| 1843 | s8 Signature[4]; |
| 1844 | u32 Length; |
| 1845 | u8 Revision; |
| 1846 | u8 Checksum; |
| 1847 | s8 OEMID[6]; |
| 1848 | s8 OEMTableID[8]; |
| 1849 | s8 OEMRevision[4]; |
| 1850 | s8 CreatorID[4]; |
| 1851 | s8 CreatorRevision[4]; |
| 1852 | u8 InterfaceType; |
| 1853 | u8 IPMIlegacy; |
| 1854 | s16 SpecificationRevision; |
| 1855 | |
| 1856 | /* |
| 1857 | * Bit 0 - SCI interrupt supported |
| 1858 | * Bit 1 - I/O APIC/SAPIC |
| 1859 | */ |
| 1860 | u8 InterruptType; |
| 1861 | |
| 1862 | /* |
| 1863 | * If bit 0 of InterruptType is set, then this is the SCI |
| 1864 | * interrupt in the GPEx_STS register. |
| 1865 | */ |
| 1866 | u8 GPE; |
| 1867 | |
| 1868 | s16 Reserved; |
| 1869 | |
| 1870 | /* |
| 1871 | * If bit 1 of InterruptType is set, then this is the I/O |
| 1872 | * APIC/SAPIC interrupt. |
| 1873 | */ |
| 1874 | u32 GlobalSystemInterrupt; |
| 1875 | |
| 1876 | /* The actual register address. */ |
| 1877 | struct acpi_generic_address addr; |
| 1878 | |
| 1879 | u8 UID[4]; |
| 1880 | |
| 1881 | s8 spmi_id[1]; /* A '\0' terminated array starts here. */ |
| 1882 | }; |
| 1883 | |
| 1884 | static int try_init_spmi(struct SPMITable *spmi) |
| 1885 | { |
| 1886 | unsigned short myaddr; |
| 1887 | |
| 1888 | if (num_addrs >= MAX_SSIF_BMCS) |
| 1889 | return -1; |
| 1890 | |
| 1891 | if (spmi->IPMIlegacy != 1) { |
| 1892 | pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy); |
| 1893 | return -ENODEV; |
| 1894 | } |
| 1895 | |
| 1896 | if (spmi->InterfaceType != 4) |
| 1897 | return -ENODEV; |
| 1898 | |
| 1899 | if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) { |
| 1900 | pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n", |
| 1901 | spmi->addr.space_id); |
| 1902 | return -EIO; |
| 1903 | } |
| 1904 | |
Corey Minyard | 70f95b7 | 2016-05-06 12:57:13 -0500 | [diff] [blame] | 1905 | myaddr = spmi->addr.address & 0x7f; |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1906 | |
| 1907 | return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI); |
| 1908 | } |
| 1909 | |
| 1910 | static void spmi_find_bmc(void) |
| 1911 | { |
| 1912 | acpi_status status; |
| 1913 | struct SPMITable *spmi; |
| 1914 | int i; |
| 1915 | |
| 1916 | if (acpi_disabled) |
| 1917 | return; |
| 1918 | |
| 1919 | if (acpi_failure) |
| 1920 | return; |
| 1921 | |
| 1922 | for (i = 0; ; i++) { |
| 1923 | status = acpi_get_table(ACPI_SIG_SPMI, i+1, |
| 1924 | (struct acpi_table_header **)&spmi); |
| 1925 | if (status != AE_OK) |
| 1926 | return; |
| 1927 | |
| 1928 | try_init_spmi(spmi); |
| 1929 | } |
| 1930 | } |
| 1931 | #else |
| 1932 | static void spmi_find_bmc(void) { } |
| 1933 | #endif |
| 1934 | |
| 1935 | #ifdef CONFIG_DMI |
| 1936 | static int decode_dmi(const struct dmi_device *dmi_dev) |
| 1937 | { |
| 1938 | struct dmi_header *dm = dmi_dev->device_data; |
| 1939 | u8 *data = (u8 *) dm; |
| 1940 | u8 len = dm->length; |
| 1941 | unsigned short myaddr; |
| 1942 | int slave_addr; |
| 1943 | |
| 1944 | if (num_addrs >= MAX_SSIF_BMCS) |
| 1945 | return -1; |
| 1946 | |
| 1947 | if (len < 9) |
| 1948 | return -1; |
| 1949 | |
| 1950 | if (data[0x04] != 4) /* Not SSIF */ |
| 1951 | return -1; |
| 1952 | |
| 1953 | if ((data[8] >> 1) == 0) { |
| 1954 | /* |
| 1955 | * Some broken systems put the I2C address in |
| 1956 | * the slave address field. We try to |
| 1957 | * accommodate them here. |
| 1958 | */ |
| 1959 | myaddr = data[6] >> 1; |
| 1960 | slave_addr = 0; |
| 1961 | } else { |
| 1962 | myaddr = data[8] >> 1; |
| 1963 | slave_addr = data[6]; |
| 1964 | } |
| 1965 | |
| 1966 | return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS); |
| 1967 | } |
| 1968 | |
| 1969 | static void dmi_iterator(void) |
| 1970 | { |
| 1971 | const struct dmi_device *dev = NULL; |
| 1972 | |
| 1973 | while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) |
| 1974 | decode_dmi(dev); |
| 1975 | } |
| 1976 | #else |
| 1977 | static void dmi_iterator(void) { } |
| 1978 | #endif |
| 1979 | |
| 1980 | static const struct i2c_device_id ssif_id[] = { |
| 1981 | { DEVICE_NAME, 0 }, |
| 1982 | { } |
| 1983 | }; |
| 1984 | MODULE_DEVICE_TABLE(i2c, ssif_id); |
| 1985 | |
| 1986 | static struct i2c_driver ssif_i2c_driver = { |
| 1987 | .class = I2C_CLASS_HWMON, |
| 1988 | .driver = { |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1989 | .name = DEVICE_NAME |
| 1990 | }, |
| 1991 | .probe = ssif_probe, |
| 1992 | .remove = ssif_remove, |
Corey Minyard | 9162052 | 2015-04-24 07:46:06 -0500 | [diff] [blame] | 1993 | .alert = ssif_alert, |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 1994 | .id_table = ssif_id, |
| 1995 | .detect = ssif_detect |
| 1996 | }; |
| 1997 | |
| 1998 | static int init_ipmi_ssif(void) |
| 1999 | { |
| 2000 | int i; |
| 2001 | int rv; |
| 2002 | |
| 2003 | if (initialized) |
| 2004 | return 0; |
| 2005 | |
| 2006 | pr_info("IPMI SSIF Interface driver\n"); |
| 2007 | |
| 2008 | /* build list for i2c from addr list */ |
| 2009 | for (i = 0; i < num_addrs; i++) { |
| 2010 | rv = new_ssif_client(addr[i], adapter_name[i], |
| 2011 | dbg[i], slave_addrs[i], |
| 2012 | SI_HARDCODED); |
Corey Minyard | d467f7a | 2015-03-26 13:35:18 -0500 | [diff] [blame] | 2013 | if (rv) |
Corey Minyard | 2593070 | 2012-03-19 16:00:55 -0500 | [diff] [blame] | 2014 | pr_err(PFX |
| 2015 | "Couldn't add hardcoded device at addr 0x%x\n", |
| 2016 | addr[i]); |
| 2017 | } |
| 2018 | |
| 2019 | if (ssif_tryacpi) |
| 2020 | ssif_i2c_driver.driver.acpi_match_table = |
| 2021 | ACPI_PTR(ssif_acpi_match); |
| 2022 | if (ssif_trydmi) |
| 2023 | dmi_iterator(); |
| 2024 | if (ssif_tryacpi) |
| 2025 | spmi_find_bmc(); |
| 2026 | |
| 2027 | ssif_i2c_driver.address_list = ssif_address_list(); |
| 2028 | |
| 2029 | rv = i2c_add_driver(&ssif_i2c_driver); |
| 2030 | if (!rv) |
| 2031 | initialized = true; |
| 2032 | |
| 2033 | return rv; |
| 2034 | } |
| 2035 | module_init(init_ipmi_ssif); |
| 2036 | |
| 2037 | static void cleanup_ipmi_ssif(void) |
| 2038 | { |
| 2039 | if (!initialized) |
| 2040 | return; |
| 2041 | |
| 2042 | initialized = false; |
| 2043 | |
| 2044 | i2c_del_driver(&ssif_i2c_driver); |
| 2045 | |
| 2046 | free_ssif_clients(); |
| 2047 | } |
| 2048 | module_exit(cleanup_ipmi_ssif); |
| 2049 | |
| 2050 | MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>"); |
| 2051 | MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus"); |
| 2052 | MODULE_LICENSE("GPL"); |