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25930707 CM |
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 | ||
25930707 CM |
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> | |
e3fe1427 | 54 | #include <linux/ctype.h> |
526290aa | 55 | #include <linux/time64.h> |
25930707 CM |
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 | ||
91620521 CM |
169 | /* Number of alers received. */ |
170 | SSIF_STAT_alerts, | |
171 | ||
25930707 CM |
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 | ||
91620521 | 220 | u8 global_enables; |
25930707 | 221 | bool has_event_buffer; |
91620521 CM |
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; | |
25930707 CM |
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; | |
412 | return; | |
413 | } | |
414 | ||
415 | ssif_info->curr_msg = msg; | |
416 | ssif_info->ssif_state = SSIF_GETTING_EVENTS; | |
417 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
418 | ||
419 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
420 | msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; | |
421 | msg->data_size = 2; | |
422 | ||
423 | check_start_send(ssif_info, flags, msg); | |
424 | } | |
425 | ||
426 | static void start_recv_msg_fetch(struct ssif_info *ssif_info, | |
427 | unsigned long *flags) | |
428 | { | |
429 | struct ipmi_smi_msg *msg; | |
430 | ||
431 | msg = ipmi_alloc_smi_msg(); | |
432 | if (!msg) { | |
433 | ssif_info->ssif_state = SSIF_NORMAL; | |
434 | return; | |
435 | } | |
436 | ||
437 | ssif_info->curr_msg = msg; | |
438 | ssif_info->ssif_state = SSIF_GETTING_MESSAGES; | |
439 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
440 | ||
441 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
442 | msg->data[1] = IPMI_GET_MSG_CMD; | |
443 | msg->data_size = 2; | |
444 | ||
445 | check_start_send(ssif_info, flags, msg); | |
446 | } | |
447 | ||
448 | /* | |
449 | * Must be called with the message lock held. This will release the | |
450 | * message lock. Note that the caller will check SSIF_IDLE and start a | |
451 | * new operation, so there is no need to check for new messages to | |
452 | * start in here. | |
453 | */ | |
454 | static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
455 | { | |
456 | if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) { | |
457 | ipmi_smi_t intf = ssif_info->intf; | |
458 | /* Watchdog pre-timeout */ | |
459 | ssif_inc_stat(ssif_info, watchdog_pretimeouts); | |
460 | start_clear_flags(ssif_info, flags); | |
461 | if (intf) | |
462 | ipmi_smi_watchdog_pretimeout(intf); | |
463 | } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL) | |
464 | /* Messages available. */ | |
465 | start_recv_msg_fetch(ssif_info, flags); | |
466 | else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL) | |
467 | /* Events available. */ | |
468 | start_event_fetch(ssif_info, flags); | |
469 | else { | |
470 | ssif_info->ssif_state = SSIF_NORMAL; | |
471 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
472 | } | |
473 | } | |
474 | ||
475 | static int ipmi_ssif_thread(void *data) | |
476 | { | |
477 | struct ssif_info *ssif_info = data; | |
478 | ||
479 | while (!kthread_should_stop()) { | |
480 | int result; | |
481 | ||
482 | /* Wait for something to do */ | |
d0acf734 CM |
483 | result = wait_for_completion_interruptible( |
484 | &ssif_info->wake_thread); | |
25930707 CM |
485 | if (ssif_info->stopping) |
486 | break; | |
d0acf734 CM |
487 | if (result == -ERESTARTSYS) |
488 | continue; | |
489 | init_completion(&ssif_info->wake_thread); | |
25930707 CM |
490 | |
491 | if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) { | |
492 | result = i2c_smbus_write_block_data( | |
3d69d43b | 493 | ssif_info->client, ssif_info->i2c_command, |
25930707 CM |
494 | ssif_info->i2c_data[0], |
495 | ssif_info->i2c_data + 1); | |
496 | ssif_info->done_handler(ssif_info, result, NULL, 0); | |
497 | } else { | |
498 | result = i2c_smbus_read_block_data( | |
3d69d43b | 499 | ssif_info->client, ssif_info->i2c_command, |
25930707 CM |
500 | ssif_info->i2c_data); |
501 | if (result < 0) | |
502 | ssif_info->done_handler(ssif_info, result, | |
503 | NULL, 0); | |
504 | else | |
505 | ssif_info->done_handler(ssif_info, 0, | |
506 | ssif_info->i2c_data, | |
507 | result); | |
508 | } | |
509 | } | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | static int ssif_i2c_send(struct ssif_info *ssif_info, | |
515 | ssif_i2c_done handler, | |
516 | int read_write, int command, | |
517 | unsigned char *data, unsigned int size) | |
518 | { | |
519 | ssif_info->done_handler = handler; | |
520 | ||
521 | ssif_info->i2c_read_write = read_write; | |
522 | ssif_info->i2c_command = command; | |
523 | ssif_info->i2c_data = data; | |
524 | ssif_info->i2c_size = size; | |
525 | complete(&ssif_info->wake_thread); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | ||
530 | static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
531 | unsigned char *data, unsigned int len); | |
532 | ||
91620521 | 533 | static void start_get(struct ssif_info *ssif_info) |
25930707 | 534 | { |
25930707 CM |
535 | int rv; |
536 | ||
25930707 | 537 | ssif_info->rtc_us_timer = 0; |
3d69d43b | 538 | ssif_info->multi_pos = 0; |
25930707 CM |
539 | |
540 | rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, | |
541 | SSIF_IPMI_RESPONSE, | |
542 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
543 | if (rv < 0) { | |
544 | /* request failed, just return the error. */ | |
545 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
546 | pr_info("Error from i2c_non_blocking_op(5)\n"); | |
547 | ||
548 | msg_done_handler(ssif_info, -EIO, NULL, 0); | |
549 | } | |
550 | } | |
551 | ||
91620521 CM |
552 | static void retry_timeout(unsigned long data) |
553 | { | |
554 | struct ssif_info *ssif_info = (void *) data; | |
555 | unsigned long oflags, *flags; | |
556 | bool waiting; | |
557 | ||
558 | if (ssif_info->stopping) | |
559 | return; | |
560 | ||
561 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
562 | waiting = ssif_info->waiting_alert; | |
563 | ssif_info->waiting_alert = false; | |
564 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
565 | ||
566 | if (waiting) | |
567 | start_get(ssif_info); | |
568 | } | |
569 | ||
570 | ||
571 | static void ssif_alert(struct i2c_client *client, unsigned int data) | |
572 | { | |
573 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
574 | unsigned long oflags, *flags; | |
575 | bool do_get = false; | |
576 | ||
577 | ssif_inc_stat(ssif_info, alerts); | |
578 | ||
579 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
580 | if (ssif_info->waiting_alert) { | |
581 | ssif_info->waiting_alert = false; | |
582 | del_timer(&ssif_info->retry_timer); | |
583 | do_get = true; | |
584 | } else if (ssif_info->curr_msg) { | |
585 | ssif_info->got_alert = true; | |
586 | } | |
587 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
588 | if (do_get) | |
589 | start_get(ssif_info); | |
590 | } | |
591 | ||
25930707 CM |
592 | static int start_resend(struct ssif_info *ssif_info); |
593 | ||
594 | static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
595 | unsigned char *data, unsigned int len) | |
596 | { | |
597 | struct ipmi_smi_msg *msg; | |
598 | unsigned long oflags, *flags; | |
599 | int rv; | |
600 | ||
601 | /* | |
602 | * We are single-threaded here, so no need for a lock until we | |
603 | * start messing with driver states or the queues. | |
604 | */ | |
605 | ||
606 | if (result < 0) { | |
607 | ssif_info->retries_left--; | |
608 | if (ssif_info->retries_left > 0) { | |
609 | ssif_inc_stat(ssif_info, receive_retries); | |
610 | ||
91620521 CM |
611 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
612 | ssif_info->waiting_alert = true; | |
613 | ssif_info->rtc_us_timer = SSIF_MSG_USEC; | |
25930707 CM |
614 | mod_timer(&ssif_info->retry_timer, |
615 | jiffies + SSIF_MSG_JIFFIES); | |
91620521 | 616 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
617 | return; |
618 | } | |
619 | ||
620 | ssif_inc_stat(ssif_info, receive_errors); | |
621 | ||
622 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
623 | pr_info("Error in msg_done_handler: %d\n", result); | |
624 | len = 0; | |
625 | goto continue_op; | |
626 | } | |
627 | ||
628 | if ((len > 1) && (ssif_info->multi_pos == 0) | |
629 | && (data[0] == 0x00) && (data[1] == 0x01)) { | |
630 | /* Start of multi-part read. Start the next transaction. */ | |
631 | int i; | |
632 | ||
633 | ssif_inc_stat(ssif_info, received_message_parts); | |
634 | ||
635 | /* Remove the multi-part read marker. */ | |
25930707 | 636 | len -= 2; |
3d69d43b CM |
637 | for (i = 0; i < len; i++) |
638 | ssif_info->data[i] = data[i+2]; | |
25930707 CM |
639 | ssif_info->multi_len = len; |
640 | ssif_info->multi_pos = 1; | |
641 | ||
642 | rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, | |
643 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
644 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
645 | if (rv < 0) { | |
646 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
647 | pr_info("Error from i2c_non_blocking_op(1)\n"); | |
648 | ||
649 | result = -EIO; | |
650 | } else | |
651 | return; | |
652 | } else if (ssif_info->multi_pos) { | |
653 | /* Middle of multi-part read. Start the next transaction. */ | |
654 | int i; | |
655 | unsigned char blocknum; | |
656 | ||
657 | if (len == 0) { | |
658 | result = -EIO; | |
659 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
660 | pr_info(PFX "Middle message with no data\n"); | |
661 | ||
662 | goto continue_op; | |
663 | } | |
664 | ||
3d69d43b | 665 | blocknum = data[0]; |
25930707 | 666 | |
3d69d43b | 667 | if (ssif_info->multi_len + len - 1 > IPMI_MAX_MSG_LENGTH) { |
25930707 CM |
668 | /* Received message too big, abort the operation. */ |
669 | result = -E2BIG; | |
670 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
671 | pr_info("Received message too big\n"); | |
672 | ||
673 | goto continue_op; | |
674 | } | |
675 | ||
676 | /* Remove the blocknum from the data. */ | |
25930707 | 677 | len--; |
3d69d43b CM |
678 | for (i = 0; i < len; i++) |
679 | ssif_info->data[i + ssif_info->multi_len] = data[i + 1]; | |
25930707 CM |
680 | ssif_info->multi_len += len; |
681 | if (blocknum == 0xff) { | |
682 | /* End of read */ | |
683 | len = ssif_info->multi_len; | |
684 | data = ssif_info->data; | |
3d69d43b | 685 | } else if (blocknum + 1 != ssif_info->multi_pos) { |
25930707 CM |
686 | /* |
687 | * Out of sequence block, just abort. Block | |
688 | * numbers start at zero for the second block, | |
689 | * but multi_pos starts at one, so the +1. | |
690 | */ | |
691 | result = -EIO; | |
692 | } else { | |
693 | ssif_inc_stat(ssif_info, received_message_parts); | |
694 | ||
695 | ssif_info->multi_pos++; | |
696 | ||
697 | rv = ssif_i2c_send(ssif_info, msg_done_handler, | |
698 | I2C_SMBUS_READ, | |
699 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
700 | ssif_info->recv, | |
701 | I2C_SMBUS_BLOCK_DATA); | |
702 | if (rv < 0) { | |
703 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
704 | pr_info(PFX | |
91620521 | 705 | "Error from ssif_i2c_send\n"); |
25930707 CM |
706 | |
707 | result = -EIO; | |
708 | } else | |
709 | return; | |
710 | } | |
711 | } | |
712 | ||
713 | if (result < 0) { | |
714 | ssif_inc_stat(ssif_info, receive_errors); | |
715 | } else { | |
716 | ssif_inc_stat(ssif_info, received_messages); | |
717 | ssif_inc_stat(ssif_info, received_message_parts); | |
718 | } | |
719 | ||
720 | ||
721 | continue_op: | |
722 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) | |
723 | pr_info(PFX "DONE 1: state = %d, result=%d.\n", | |
724 | ssif_info->ssif_state, result); | |
725 | ||
726 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
727 | msg = ssif_info->curr_msg; | |
728 | if (msg) { | |
729 | msg->rsp_size = len; | |
730 | if (msg->rsp_size > IPMI_MAX_MSG_LENGTH) | |
731 | msg->rsp_size = IPMI_MAX_MSG_LENGTH; | |
732 | memcpy(msg->rsp, data, msg->rsp_size); | |
733 | ssif_info->curr_msg = NULL; | |
734 | } | |
735 | ||
736 | switch (ssif_info->ssif_state) { | |
737 | case SSIF_NORMAL: | |
738 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
739 | if (!msg) | |
740 | break; | |
741 | ||
742 | if (result < 0) | |
743 | return_hosed_msg(ssif_info, msg); | |
744 | else | |
745 | deliver_recv_msg(ssif_info, msg); | |
746 | break; | |
747 | ||
748 | case SSIF_GETTING_FLAGS: | |
749 | /* We got the flags from the SSIF, now handle them. */ | |
750 | if ((result < 0) || (len < 4) || (data[2] != 0)) { | |
751 | /* | |
752 | * Error fetching flags, or invalid length, | |
753 | * just give up for now. | |
754 | */ | |
755 | ssif_info->ssif_state = SSIF_NORMAL; | |
756 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
757 | pr_warn(PFX "Error getting flags: %d %d, %x\n", | |
758 | result, len, data[2]); | |
759 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
760 | || data[1] != IPMI_GET_MSG_FLAGS_CMD) { | |
761 | pr_warn(PFX "Invalid response getting flags: %x %x\n", | |
762 | data[0], data[1]); | |
763 | } else { | |
764 | ssif_inc_stat(ssif_info, flag_fetches); | |
765 | ssif_info->msg_flags = data[3]; | |
766 | handle_flags(ssif_info, flags); | |
767 | } | |
768 | break; | |
769 | ||
770 | case SSIF_CLEARING_FLAGS: | |
771 | /* We cleared the flags. */ | |
772 | if ((result < 0) || (len < 3) || (data[2] != 0)) { | |
773 | /* Error clearing flags */ | |
774 | pr_warn(PFX "Error clearing flags: %d %d, %x\n", | |
775 | result, len, data[2]); | |
776 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
777 | || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) { | |
778 | pr_warn(PFX "Invalid response clearing flags: %x %x\n", | |
779 | data[0], data[1]); | |
780 | } | |
781 | ssif_info->ssif_state = SSIF_NORMAL; | |
782 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
783 | break; | |
784 | ||
785 | case SSIF_GETTING_EVENTS: | |
786 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { | |
787 | /* Error getting event, probably done. */ | |
788 | msg->done(msg); | |
789 | ||
790 | /* Take off the event flag. */ | |
791 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
792 | handle_flags(ssif_info, flags); | |
793 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
794 | || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) { | |
795 | pr_warn(PFX "Invalid response getting events: %x %x\n", | |
796 | msg->rsp[0], msg->rsp[1]); | |
797 | msg->done(msg); | |
798 | /* Take off the event flag. */ | |
799 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
800 | handle_flags(ssif_info, flags); | |
801 | } else { | |
802 | handle_flags(ssif_info, flags); | |
803 | ssif_inc_stat(ssif_info, events); | |
804 | deliver_recv_msg(ssif_info, msg); | |
805 | } | |
806 | break; | |
807 | ||
808 | case SSIF_GETTING_MESSAGES: | |
809 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { | |
810 | /* Error getting event, probably done. */ | |
811 | msg->done(msg); | |
812 | ||
813 | /* Take off the msg flag. */ | |
814 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
815 | handle_flags(ssif_info, flags); | |
816 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
817 | || msg->rsp[1] != IPMI_GET_MSG_CMD) { | |
818 | pr_warn(PFX "Invalid response clearing flags: %x %x\n", | |
819 | msg->rsp[0], msg->rsp[1]); | |
820 | msg->done(msg); | |
821 | ||
822 | /* Take off the msg flag. */ | |
823 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
824 | handle_flags(ssif_info, flags); | |
825 | } else { | |
826 | ssif_inc_stat(ssif_info, incoming_messages); | |
827 | handle_flags(ssif_info, flags); | |
828 | deliver_recv_msg(ssif_info, msg); | |
829 | } | |
830 | break; | |
831 | } | |
832 | ||
833 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
834 | if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) { | |
835 | if (ssif_info->req_events) | |
836 | start_event_fetch(ssif_info, flags); | |
837 | else if (ssif_info->req_flags) | |
838 | start_flag_fetch(ssif_info, flags); | |
839 | else | |
840 | start_next_msg(ssif_info, flags); | |
841 | } else | |
842 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
843 | ||
844 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) | |
845 | pr_info(PFX "DONE 2: state = %d.\n", ssif_info->ssif_state); | |
846 | } | |
847 | ||
848 | static void msg_written_handler(struct ssif_info *ssif_info, int result, | |
849 | unsigned char *data, unsigned int len) | |
850 | { | |
851 | int rv; | |
852 | ||
853 | /* We are single-threaded here, so no need for a lock. */ | |
854 | if (result < 0) { | |
855 | ssif_info->retries_left--; | |
856 | if (ssif_info->retries_left > 0) { | |
857 | if (!start_resend(ssif_info)) { | |
858 | ssif_inc_stat(ssif_info, send_retries); | |
859 | return; | |
860 | } | |
861 | /* request failed, just return the error. */ | |
862 | ssif_inc_stat(ssif_info, send_errors); | |
863 | ||
864 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
865 | pr_info(PFX | |
866 | "Out of retries in msg_written_handler\n"); | |
867 | msg_done_handler(ssif_info, -EIO, NULL, 0); | |
868 | return; | |
869 | } | |
870 | ||
871 | ssif_inc_stat(ssif_info, send_errors); | |
872 | ||
873 | /* | |
874 | * Got an error on transmit, let the done routine | |
875 | * handle it. | |
876 | */ | |
877 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
878 | pr_info("Error in msg_written_handler: %d\n", result); | |
879 | ||
880 | msg_done_handler(ssif_info, result, NULL, 0); | |
881 | return; | |
882 | } | |
883 | ||
884 | if (ssif_info->multi_data) { | |
3d69d43b CM |
885 | /* |
886 | * In the middle of a multi-data write. See the comment | |
887 | * in the SSIF_MULTI_n_PART case in the probe function | |
888 | * for details on the intricacies of this. | |
889 | */ | |
25930707 CM |
890 | int left; |
891 | ||
892 | ssif_inc_stat(ssif_info, sent_messages_parts); | |
893 | ||
894 | left = ssif_info->multi_len - ssif_info->multi_pos; | |
895 | if (left > 32) | |
896 | left = 32; | |
897 | /* Length byte. */ | |
898 | ssif_info->multi_data[ssif_info->multi_pos] = left; | |
899 | ssif_info->multi_pos += left; | |
900 | if (left < 32) | |
901 | /* | |
902 | * Write is finished. Note that we must end | |
903 | * with a write of less than 32 bytes to | |
904 | * complete the transaction, even if it is | |
905 | * zero bytes. | |
906 | */ | |
907 | ssif_info->multi_data = NULL; | |
908 | ||
909 | rv = ssif_i2c_send(ssif_info, msg_written_handler, | |
910 | I2C_SMBUS_WRITE, | |
911 | SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, | |
912 | ssif_info->multi_data + ssif_info->multi_pos, | |
913 | I2C_SMBUS_BLOCK_DATA); | |
914 | if (rv < 0) { | |
915 | /* request failed, just return the error. */ | |
916 | ssif_inc_stat(ssif_info, send_errors); | |
917 | ||
918 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
919 | pr_info("Error from i2c_non_blocking_op(3)\n"); | |
920 | msg_done_handler(ssif_info, -EIO, NULL, 0); | |
921 | } | |
922 | } else { | |
91620521 CM |
923 | unsigned long oflags, *flags; |
924 | bool got_alert; | |
925 | ||
25930707 CM |
926 | ssif_inc_stat(ssif_info, sent_messages); |
927 | ssif_inc_stat(ssif_info, sent_messages_parts); | |
928 | ||
91620521 CM |
929 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
930 | got_alert = ssif_info->got_alert; | |
931 | if (got_alert) { | |
932 | ssif_info->got_alert = false; | |
933 | ssif_info->waiting_alert = false; | |
934 | } | |
935 | ||
936 | if (got_alert) { | |
937 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
938 | /* The alert already happened, try now. */ | |
939 | retry_timeout((unsigned long) ssif_info); | |
940 | } else { | |
941 | /* Wait a jiffie then request the next message */ | |
942 | ssif_info->waiting_alert = true; | |
943 | ssif_info->retries_left = SSIF_RECV_RETRIES; | |
944 | ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC; | |
945 | mod_timer(&ssif_info->retry_timer, | |
946 | jiffies + SSIF_MSG_PART_JIFFIES); | |
947 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
948 | } | |
25930707 CM |
949 | } |
950 | } | |
951 | ||
952 | static int start_resend(struct ssif_info *ssif_info) | |
953 | { | |
954 | int rv; | |
955 | int command; | |
956 | ||
91620521 CM |
957 | ssif_info->got_alert = false; |
958 | ||
25930707 CM |
959 | if (ssif_info->data_len > 32) { |
960 | command = SSIF_IPMI_MULTI_PART_REQUEST_START; | |
961 | ssif_info->multi_data = ssif_info->data; | |
962 | ssif_info->multi_len = ssif_info->data_len; | |
963 | /* | |
964 | * Subtle thing, this is 32, not 33, because we will | |
965 | * overwrite the thing at position 32 (which was just | |
966 | * transmitted) with the new length. | |
967 | */ | |
968 | ssif_info->multi_pos = 32; | |
969 | ssif_info->data[0] = 32; | |
970 | } else { | |
971 | ssif_info->multi_data = NULL; | |
972 | command = SSIF_IPMI_REQUEST; | |
973 | ssif_info->data[0] = ssif_info->data_len; | |
974 | } | |
975 | ||
976 | rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE, | |
977 | command, ssif_info->data, I2C_SMBUS_BLOCK_DATA); | |
978 | if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG)) | |
979 | pr_info("Error from i2c_non_blocking_op(4)\n"); | |
980 | return rv; | |
981 | } | |
982 | ||
983 | static int start_send(struct ssif_info *ssif_info, | |
984 | unsigned char *data, | |
985 | unsigned int len) | |
986 | { | |
987 | if (len > IPMI_MAX_MSG_LENGTH) | |
988 | return -E2BIG; | |
989 | if (len > ssif_info->max_xmit_msg_size) | |
990 | return -E2BIG; | |
991 | ||
992 | ssif_info->retries_left = SSIF_SEND_RETRIES; | |
3d69d43b | 993 | memcpy(ssif_info->data + 1, data, len); |
25930707 CM |
994 | ssif_info->data_len = len; |
995 | return start_resend(ssif_info); | |
996 | } | |
997 | ||
998 | /* Must be called with the message lock held. */ | |
999 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags) | |
1000 | { | |
1001 | struct ipmi_smi_msg *msg; | |
1002 | unsigned long oflags; | |
1003 | ||
1004 | restart: | |
1005 | if (!SSIF_IDLE(ssif_info)) { | |
1006 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1007 | return; | |
1008 | } | |
1009 | ||
1010 | if (!ssif_info->waiting_msg) { | |
1011 | ssif_info->curr_msg = NULL; | |
1012 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1013 | } else { | |
1014 | int rv; | |
1015 | ||
1016 | ssif_info->curr_msg = ssif_info->waiting_msg; | |
1017 | ssif_info->waiting_msg = NULL; | |
1018 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1019 | rv = start_send(ssif_info, | |
1020 | ssif_info->curr_msg->data, | |
1021 | ssif_info->curr_msg->data_size); | |
1022 | if (rv) { | |
1023 | msg = ssif_info->curr_msg; | |
1024 | ssif_info->curr_msg = NULL; | |
1025 | return_hosed_msg(ssif_info, msg); | |
1026 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1027 | goto restart; | |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | static void sender(void *send_info, | |
1033 | struct ipmi_smi_msg *msg) | |
1034 | { | |
1035 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
1036 | unsigned long oflags, *flags; | |
1037 | ||
1038 | BUG_ON(ssif_info->waiting_msg); | |
1039 | ssif_info->waiting_msg = msg; | |
1040 | ||
1041 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1042 | start_next_msg(ssif_info, flags); | |
1043 | ||
1044 | if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) { | |
526290aa | 1045 | struct timespec64 t; |
25930707 | 1046 | |
526290aa AKC |
1047 | ktime_get_real_ts64(&t); |
1048 | pr_info("**Enqueue %02x %02x: %lld.%6.6ld\n", | |
1421c935 | 1049 | msg->data[0], msg->data[1], |
526290aa | 1050 | (long long) t.tv_sec, (long) t.tv_nsec / NSEC_PER_USEC); |
25930707 CM |
1051 | } |
1052 | } | |
1053 | ||
1054 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) | |
1055 | { | |
1056 | struct ssif_info *ssif_info = send_info; | |
1057 | ||
1058 | data->addr_src = ssif_info->addr_source; | |
1059 | data->dev = &ssif_info->client->dev; | |
1060 | data->addr_info = ssif_info->addr_info; | |
1061 | get_device(data->dev); | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Instead of having our own timer to periodically check the message | |
1068 | * flags, we let the message handler drive us. | |
1069 | */ | |
1070 | static void request_events(void *send_info) | |
1071 | { | |
1072 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
1073 | unsigned long oflags, *flags; | |
1074 | ||
1075 | if (!ssif_info->has_event_buffer) | |
1076 | return; | |
1077 | ||
1078 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1079 | /* | |
1080 | * Request flags first, not events, because the lower layer | |
1081 | * doesn't have a way to send an attention. But make sure | |
1082 | * event checking still happens. | |
1083 | */ | |
1084 | ssif_info->req_events = true; | |
1085 | if (SSIF_IDLE(ssif_info)) | |
1086 | start_flag_fetch(ssif_info, flags); | |
1087 | else { | |
1088 | ssif_info->req_flags = true; | |
1089 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | static int inc_usecount(void *send_info) | |
1094 | { | |
1095 | struct ssif_info *ssif_info = send_info; | |
1096 | ||
1097 | if (!i2c_get_adapter(ssif_info->client->adapter->nr)) | |
1098 | return -ENODEV; | |
1099 | ||
1100 | i2c_use_client(ssif_info->client); | |
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | static void dec_usecount(void *send_info) | |
1105 | { | |
1106 | struct ssif_info *ssif_info = send_info; | |
1107 | ||
1108 | i2c_release_client(ssif_info->client); | |
1109 | i2c_put_adapter(ssif_info->client->adapter); | |
1110 | } | |
1111 | ||
1112 | static int ssif_start_processing(void *send_info, | |
1113 | ipmi_smi_t intf) | |
1114 | { | |
1115 | struct ssif_info *ssif_info = send_info; | |
1116 | ||
1117 | ssif_info->intf = intf; | |
1118 | ||
1119 | return 0; | |
1120 | } | |
1121 | ||
1122 | #define MAX_SSIF_BMCS 4 | |
1123 | ||
1124 | static unsigned short addr[MAX_SSIF_BMCS]; | |
1125 | static int num_addrs; | |
1126 | module_param_array(addr, ushort, &num_addrs, 0); | |
1127 | MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs."); | |
1128 | ||
1129 | static char *adapter_name[MAX_SSIF_BMCS]; | |
1130 | static int num_adapter_names; | |
1131 | module_param_array(adapter_name, charp, &num_adapter_names, 0); | |
1132 | MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned."); | |
1133 | ||
1134 | static int slave_addrs[MAX_SSIF_BMCS]; | |
1135 | static int num_slave_addrs; | |
1136 | module_param_array(slave_addrs, int, &num_slave_addrs, 0); | |
1137 | MODULE_PARM_DESC(slave_addrs, | |
1138 | "The default IPMB slave address for the controller."); | |
1139 | ||
bf2d0877 CM |
1140 | static bool alerts_broken; |
1141 | module_param(alerts_broken, bool, 0); | |
1142 | MODULE_PARM_DESC(alerts_broken, "Don't enable alerts for the controller."); | |
1143 | ||
25930707 CM |
1144 | /* |
1145 | * Bit 0 enables message debugging, bit 1 enables state debugging, and | |
1146 | * bit 2 enables timing debugging. This is an array indexed by | |
1147 | * interface number" | |
1148 | */ | |
1149 | static int dbg[MAX_SSIF_BMCS]; | |
1150 | static int num_dbg; | |
1151 | module_param_array(dbg, int, &num_dbg, 0); | |
1152 | MODULE_PARM_DESC(dbg, "Turn on debugging."); | |
1153 | ||
1154 | static bool ssif_dbg_probe; | |
1155 | module_param_named(dbg_probe, ssif_dbg_probe, bool, 0); | |
1156 | MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters."); | |
1157 | ||
1158 | static int use_thread; | |
1159 | module_param(use_thread, int, 0); | |
1160 | MODULE_PARM_DESC(use_thread, "Use the thread interface."); | |
1161 | ||
fedb25ea | 1162 | static bool ssif_tryacpi = true; |
25930707 CM |
1163 | module_param_named(tryacpi, ssif_tryacpi, bool, 0); |
1164 | MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI"); | |
1165 | ||
fedb25ea | 1166 | static bool ssif_trydmi = true; |
25930707 CM |
1167 | module_param_named(trydmi, ssif_trydmi, bool, 0); |
1168 | MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)"); | |
1169 | ||
1170 | static DEFINE_MUTEX(ssif_infos_mutex); | |
1171 | static LIST_HEAD(ssif_infos); | |
1172 | ||
1173 | static int ssif_remove(struct i2c_client *client) | |
1174 | { | |
1175 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
1176 | int rv; | |
1177 | ||
1178 | if (!ssif_info) | |
1179 | return 0; | |
1180 | ||
25930707 CM |
1181 | /* |
1182 | * After this point, we won't deliver anything asychronously | |
1183 | * to the message handler. We can unregister ourself. | |
1184 | */ | |
1185 | rv = ipmi_unregister_smi(ssif_info->intf); | |
1186 | if (rv) { | |
1187 | pr_err(PFX "Unable to unregister device: errno=%d\n", rv); | |
1188 | return rv; | |
1189 | } | |
1190 | ssif_info->intf = NULL; | |
1191 | ||
1192 | /* make sure the driver is not looking for flags any more. */ | |
1193 | while (ssif_info->ssif_state != SSIF_NORMAL) | |
1194 | schedule_timeout(1); | |
1195 | ||
1196 | ssif_info->stopping = true; | |
1197 | del_timer_sync(&ssif_info->retry_timer); | |
1198 | if (ssif_info->thread) { | |
1199 | complete(&ssif_info->wake_thread); | |
1200 | kthread_stop(ssif_info->thread); | |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * No message can be outstanding now, we have removed the | |
1205 | * upper layer and it permitted us to do so. | |
1206 | */ | |
1207 | kfree(ssif_info); | |
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | static int do_cmd(struct i2c_client *client, int len, unsigned char *msg, | |
1212 | int *resp_len, unsigned char *resp) | |
1213 | { | |
1214 | int retry_cnt; | |
1215 | int ret; | |
1216 | ||
1217 | retry_cnt = SSIF_SEND_RETRIES; | |
1218 | retry1: | |
1219 | ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg); | |
1220 | if (ret) { | |
1221 | retry_cnt--; | |
1222 | if (retry_cnt > 0) | |
1223 | goto retry1; | |
1224 | return -ENODEV; | |
1225 | } | |
1226 | ||
1227 | ret = -ENODEV; | |
1228 | retry_cnt = SSIF_RECV_RETRIES; | |
1229 | while (retry_cnt > 0) { | |
1230 | ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE, | |
1231 | resp); | |
1232 | if (ret > 0) | |
1233 | break; | |
1234 | msleep(SSIF_MSG_MSEC); | |
1235 | retry_cnt--; | |
1236 | if (retry_cnt <= 0) | |
1237 | break; | |
1238 | } | |
1239 | ||
1240 | if (ret > 0) { | |
1241 | /* Validate that the response is correct. */ | |
1242 | if (ret < 3 || | |
1243 | (resp[0] != (msg[0] | (1 << 2))) || | |
1244 | (resp[1] != msg[1])) | |
1245 | ret = -EINVAL; | |
1246 | else { | |
1247 | *resp_len = ret; | |
1248 | ret = 0; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | return ret; | |
1253 | } | |
1254 | ||
1255 | static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info) | |
1256 | { | |
1257 | unsigned char *resp; | |
1258 | unsigned char msg[3]; | |
1259 | int rv; | |
1260 | int len; | |
1261 | ||
1262 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1263 | if (!resp) | |
1264 | return -ENOMEM; | |
1265 | ||
1266 | /* Do a Get Device ID command, since it is required. */ | |
1267 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1268 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1269 | rv = do_cmd(client, 2, msg, &len, resp); | |
1270 | if (rv) | |
1271 | rv = -ENODEV; | |
1272 | else | |
1273 | strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE); | |
1274 | kfree(resp); | |
1275 | return rv; | |
1276 | } | |
1277 | ||
1278 | static int smi_type_proc_show(struct seq_file *m, void *v) | |
1279 | { | |
d6c5dc18 JP |
1280 | seq_puts(m, "ssif\n"); |
1281 | ||
5e33cd0c | 1282 | return 0; |
25930707 CM |
1283 | } |
1284 | ||
1285 | static int smi_type_proc_open(struct inode *inode, struct file *file) | |
1286 | { | |
1287 | return single_open(file, smi_type_proc_show, inode->i_private); | |
1288 | } | |
1289 | ||
1290 | static const struct file_operations smi_type_proc_ops = { | |
1291 | .open = smi_type_proc_open, | |
1292 | .read = seq_read, | |
1293 | .llseek = seq_lseek, | |
1294 | .release = single_release, | |
1295 | }; | |
1296 | ||
1297 | static int smi_stats_proc_show(struct seq_file *m, void *v) | |
1298 | { | |
1299 | struct ssif_info *ssif_info = m->private; | |
1300 | ||
1301 | seq_printf(m, "sent_messages: %u\n", | |
1302 | ssif_get_stat(ssif_info, sent_messages)); | |
1303 | seq_printf(m, "sent_messages_parts: %u\n", | |
1304 | ssif_get_stat(ssif_info, sent_messages_parts)); | |
1305 | seq_printf(m, "send_retries: %u\n", | |
1306 | ssif_get_stat(ssif_info, send_retries)); | |
1307 | seq_printf(m, "send_errors: %u\n", | |
1308 | ssif_get_stat(ssif_info, send_errors)); | |
1309 | seq_printf(m, "received_messages: %u\n", | |
1310 | ssif_get_stat(ssif_info, received_messages)); | |
1311 | seq_printf(m, "received_message_parts: %u\n", | |
1312 | ssif_get_stat(ssif_info, received_message_parts)); | |
1313 | seq_printf(m, "receive_retries: %u\n", | |
1314 | ssif_get_stat(ssif_info, receive_retries)); | |
1315 | seq_printf(m, "receive_errors: %u\n", | |
1316 | ssif_get_stat(ssif_info, receive_errors)); | |
1317 | seq_printf(m, "flag_fetches: %u\n", | |
1318 | ssif_get_stat(ssif_info, flag_fetches)); | |
1319 | seq_printf(m, "hosed: %u\n", | |
1320 | ssif_get_stat(ssif_info, hosed)); | |
1321 | seq_printf(m, "events: %u\n", | |
1322 | ssif_get_stat(ssif_info, events)); | |
1323 | seq_printf(m, "watchdog_pretimeouts: %u\n", | |
1324 | ssif_get_stat(ssif_info, watchdog_pretimeouts)); | |
91620521 CM |
1325 | seq_printf(m, "alerts: %u\n", |
1326 | ssif_get_stat(ssif_info, alerts)); | |
25930707 CM |
1327 | return 0; |
1328 | } | |
1329 | ||
1330 | static int smi_stats_proc_open(struct inode *inode, struct file *file) | |
1331 | { | |
1332 | return single_open(file, smi_stats_proc_show, PDE_DATA(inode)); | |
1333 | } | |
1334 | ||
1335 | static const struct file_operations smi_stats_proc_ops = { | |
1336 | .open = smi_stats_proc_open, | |
1337 | .read = seq_read, | |
1338 | .llseek = seq_lseek, | |
1339 | .release = single_release, | |
1340 | }; | |
1341 | ||
b0e9aaa9 CM |
1342 | static int strcmp_nospace(char *s1, char *s2) |
1343 | { | |
1344 | while (*s1 && *s2) { | |
1345 | while (isspace(*s1)) | |
1346 | s1++; | |
1347 | while (isspace(*s2)) | |
1348 | s2++; | |
1349 | if (*s1 > *s2) | |
1350 | return 1; | |
1351 | if (*s1 < *s2) | |
1352 | return -1; | |
1353 | s1++; | |
1354 | s2++; | |
1355 | } | |
1356 | return 0; | |
1357 | } | |
1358 | ||
25930707 CM |
1359 | static struct ssif_addr_info *ssif_info_find(unsigned short addr, |
1360 | char *adapter_name, | |
1361 | bool match_null_name) | |
1362 | { | |
1363 | struct ssif_addr_info *info, *found = NULL; | |
1364 | ||
1365 | restart: | |
1366 | list_for_each_entry(info, &ssif_infos, link) { | |
1367 | if (info->binfo.addr == addr) { | |
1368 | if (info->adapter_name || adapter_name) { | |
1369 | if (!info->adapter_name != !adapter_name) { | |
1370 | /* One is NULL and one is not */ | |
1371 | continue; | |
1372 | } | |
b0e9aaa9 CM |
1373 | if (adapter_name && |
1374 | strcmp_nospace(info->adapter_name, | |
1375 | adapter_name)) | |
1376 | /* Names do not match */ | |
25930707 CM |
1377 | continue; |
1378 | } | |
1379 | found = info; | |
1380 | break; | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | if (!found && match_null_name) { | |
1385 | /* Try to get an exact match first, then try with a NULL name */ | |
1386 | adapter_name = NULL; | |
1387 | match_null_name = false; | |
1388 | goto restart; | |
1389 | } | |
1390 | ||
1391 | return found; | |
1392 | } | |
1393 | ||
1394 | static bool check_acpi(struct ssif_info *ssif_info, struct device *dev) | |
1395 | { | |
1396 | #ifdef CONFIG_ACPI | |
1397 | acpi_handle acpi_handle; | |
1398 | ||
1399 | acpi_handle = ACPI_HANDLE(dev); | |
1400 | if (acpi_handle) { | |
1401 | ssif_info->addr_source = SI_ACPI; | |
1402 | ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle; | |
1403 | return true; | |
1404 | } | |
1405 | #endif | |
1406 | return false; | |
1407 | } | |
1408 | ||
91620521 CM |
1409 | /* |
1410 | * Global enables we care about. | |
1411 | */ | |
1412 | #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ | |
1413 | IPMI_BMC_EVT_MSG_INTR) | |
1414 | ||
25930707 CM |
1415 | static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id) |
1416 | { | |
1417 | unsigned char msg[3]; | |
1418 | unsigned char *resp; | |
1419 | struct ssif_info *ssif_info; | |
1420 | int rv = 0; | |
1421 | int len; | |
1422 | int i; | |
1423 | u8 slave_addr = 0; | |
1424 | struct ssif_addr_info *addr_info = NULL; | |
1425 | ||
1426 | ||
1427 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1428 | if (!resp) | |
1429 | return -ENOMEM; | |
1430 | ||
1431 | ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL); | |
1432 | if (!ssif_info) { | |
1433 | kfree(resp); | |
1434 | return -ENOMEM; | |
1435 | } | |
1436 | ||
1437 | if (!check_acpi(ssif_info, &client->dev)) { | |
1438 | addr_info = ssif_info_find(client->addr, client->adapter->name, | |
1439 | true); | |
1440 | if (!addr_info) { | |
1441 | /* Must have come in through sysfs. */ | |
1442 | ssif_info->addr_source = SI_HOTMOD; | |
1443 | } else { | |
1444 | ssif_info->addr_source = addr_info->addr_src; | |
1445 | ssif_info->ssif_debug = addr_info->debug; | |
1446 | ssif_info->addr_info = addr_info->addr_info; | |
1447 | slave_addr = addr_info->slave_addr; | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | pr_info(PFX "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n", | |
1452 | ipmi_addr_src_to_str(ssif_info->addr_source), | |
1453 | client->addr, client->adapter->name, slave_addr); | |
1454 | ||
1455 | /* | |
1456 | * Do a Get Device ID command, since it comes back with some | |
1457 | * useful info. | |
1458 | */ | |
1459 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1460 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1461 | rv = do_cmd(client, 2, msg, &len, resp); | |
1462 | if (rv) | |
1463 | goto out; | |
1464 | ||
1465 | rv = ipmi_demangle_device_id(resp, len, &ssif_info->device_id); | |
1466 | if (rv) | |
1467 | goto out; | |
1468 | ||
1469 | ssif_info->client = client; | |
1470 | i2c_set_clientdata(client, ssif_info); | |
1471 | ||
1472 | /* Now check for system interface capabilities */ | |
1473 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1474 | msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD; | |
1475 | msg[2] = 0; /* SSIF */ | |
1476 | rv = do_cmd(client, 3, msg, &len, resp); | |
1477 | if (!rv && (len >= 3) && (resp[2] == 0)) { | |
1478 | if (len < 7) { | |
1479 | if (ssif_dbg_probe) | |
1480 | pr_info(PFX "SSIF info too short: %d\n", len); | |
1481 | goto no_support; | |
1482 | } | |
1483 | ||
1484 | /* Got a good SSIF response, handle it. */ | |
1485 | ssif_info->max_xmit_msg_size = resp[5]; | |
1486 | ssif_info->max_recv_msg_size = resp[6]; | |
1487 | ssif_info->multi_support = (resp[4] >> 6) & 0x3; | |
1488 | ssif_info->supports_pec = (resp[4] >> 3) & 0x1; | |
1489 | ||
1490 | /* Sanitize the data */ | |
1491 | switch (ssif_info->multi_support) { | |
1492 | case SSIF_NO_MULTI: | |
1493 | if (ssif_info->max_xmit_msg_size > 32) | |
1494 | ssif_info->max_xmit_msg_size = 32; | |
1495 | if (ssif_info->max_recv_msg_size > 32) | |
1496 | ssif_info->max_recv_msg_size = 32; | |
1497 | break; | |
1498 | ||
1499 | case SSIF_MULTI_2_PART: | |
3d69d43b CM |
1500 | if (ssif_info->max_xmit_msg_size > 63) |
1501 | ssif_info->max_xmit_msg_size = 63; | |
25930707 CM |
1502 | if (ssif_info->max_recv_msg_size > 62) |
1503 | ssif_info->max_recv_msg_size = 62; | |
1504 | break; | |
1505 | ||
1506 | case SSIF_MULTI_n_PART: | |
3d69d43b CM |
1507 | /* |
1508 | * The specification is rather confusing at | |
1509 | * this point, but I think I understand what | |
1510 | * is meant. At least I have a workable | |
1511 | * solution. With multi-part messages, you | |
1512 | * cannot send a message that is a multiple of | |
1513 | * 32-bytes in length, because the start and | |
1514 | * middle messages are 32-bytes and the end | |
1515 | * message must be at least one byte. You | |
1516 | * can't fudge on an extra byte, that would | |
1517 | * screw up things like fru data writes. So | |
1518 | * we limit the length to 63 bytes. That way | |
1519 | * a 32-byte message gets sent as a single | |
1520 | * part. A larger message will be a 32-byte | |
1521 | * start and the next message is always going | |
1522 | * to be 1-31 bytes in length. Not ideal, but | |
1523 | * it should work. | |
1524 | */ | |
1525 | if (ssif_info->max_xmit_msg_size > 63) | |
1526 | ssif_info->max_xmit_msg_size = 63; | |
25930707 CM |
1527 | break; |
1528 | ||
1529 | default: | |
1530 | /* Data is not sane, just give up. */ | |
1531 | goto no_support; | |
1532 | } | |
1533 | } else { | |
1534 | no_support: | |
1535 | /* Assume no multi-part or PEC support */ | |
b0e9aaa9 | 1536 | pr_info(PFX "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n", |
25930707 CM |
1537 | rv, len, resp[2]); |
1538 | ||
1539 | ssif_info->max_xmit_msg_size = 32; | |
1540 | ssif_info->max_recv_msg_size = 32; | |
1541 | ssif_info->multi_support = SSIF_NO_MULTI; | |
1542 | ssif_info->supports_pec = 0; | |
1543 | } | |
1544 | ||
1545 | /* Make sure the NMI timeout is cleared. */ | |
1546 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1547 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
1548 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
1549 | rv = do_cmd(client, 3, msg, &len, resp); | |
1550 | if (rv || (len < 3) || (resp[2] != 0)) | |
1551 | pr_warn(PFX "Unable to clear message flags: %d %d %2.2x\n", | |
1552 | rv, len, resp[2]); | |
1553 | ||
1554 | /* Attempt to enable the event buffer. */ | |
1555 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1556 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1557 | rv = do_cmd(client, 2, msg, &len, resp); | |
1558 | if (rv || (len < 4) || (resp[2] != 0)) { | |
1559 | pr_warn(PFX "Error getting global enables: %d %d %2.2x\n", | |
1560 | rv, len, resp[2]); | |
1561 | rv = 0; /* Not fatal */ | |
1562 | goto found; | |
1563 | } | |
1564 | ||
91620521 CM |
1565 | ssif_info->global_enables = resp[3]; |
1566 | ||
25930707 CM |
1567 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
1568 | ssif_info->has_event_buffer = true; | |
1569 | /* buffer is already enabled, nothing to do. */ | |
1570 | goto found; | |
1571 | } | |
1572 | ||
1573 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1574 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
91620521 | 1575 | msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF; |
25930707 CM |
1576 | rv = do_cmd(client, 3, msg, &len, resp); |
1577 | if (rv || (len < 2)) { | |
91620521 | 1578 | pr_warn(PFX "Error setting global enables: %d %d %2.2x\n", |
25930707 CM |
1579 | rv, len, resp[2]); |
1580 | rv = 0; /* Not fatal */ | |
1581 | goto found; | |
1582 | } | |
1583 | ||
91620521 | 1584 | if (resp[2] == 0) { |
25930707 CM |
1585 | /* A successful return means the event buffer is supported. */ |
1586 | ssif_info->has_event_buffer = true; | |
91620521 CM |
1587 | ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF; |
1588 | } | |
1589 | ||
bf2d0877 CM |
1590 | /* Some systems don't behave well if you enable alerts. */ |
1591 | if (alerts_broken) | |
1592 | goto found; | |
1593 | ||
91620521 CM |
1594 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
1595 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1596 | msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR; | |
1597 | rv = do_cmd(client, 3, msg, &len, resp); | |
1598 | if (rv || (len < 2)) { | |
1599 | pr_warn(PFX "Error setting global enables: %d %d %2.2x\n", | |
1600 | rv, len, resp[2]); | |
1601 | rv = 0; /* Not fatal */ | |
1602 | goto found; | |
1603 | } | |
1604 | ||
1605 | if (resp[2] == 0) { | |
1606 | /* A successful return means the alert is supported. */ | |
1607 | ssif_info->supports_alert = true; | |
1608 | ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR; | |
1609 | } | |
25930707 CM |
1610 | |
1611 | found: | |
1612 | ssif_info->intf_num = atomic_inc_return(&next_intf); | |
1613 | ||
1614 | if (ssif_dbg_probe) { | |
1615 | pr_info("ssif_probe: i2c_probe found device at i2c address %x\n", | |
1616 | client->addr); | |
1617 | } | |
1618 | ||
1619 | spin_lock_init(&ssif_info->lock); | |
1620 | ssif_info->ssif_state = SSIF_NORMAL; | |
1621 | init_timer(&ssif_info->retry_timer); | |
1622 | ssif_info->retry_timer.data = (unsigned long) ssif_info; | |
1623 | ssif_info->retry_timer.function = retry_timeout; | |
1624 | ||
1625 | for (i = 0; i < SSIF_NUM_STATS; i++) | |
1626 | atomic_set(&ssif_info->stats[i], 0); | |
1627 | ||
1628 | if (ssif_info->supports_pec) | |
1629 | ssif_info->client->flags |= I2C_CLIENT_PEC; | |
1630 | ||
1631 | ssif_info->handlers.owner = THIS_MODULE; | |
1632 | ssif_info->handlers.start_processing = ssif_start_processing; | |
1633 | ssif_info->handlers.get_smi_info = get_smi_info; | |
1634 | ssif_info->handlers.sender = sender; | |
1635 | ssif_info->handlers.request_events = request_events; | |
1636 | ssif_info->handlers.inc_usecount = inc_usecount; | |
1637 | ssif_info->handlers.dec_usecount = dec_usecount; | |
1638 | ||
1639 | { | |
1640 | unsigned int thread_num; | |
1641 | ||
1642 | thread_num = ((ssif_info->client->adapter->nr << 8) | | |
1643 | ssif_info->client->addr); | |
1644 | init_completion(&ssif_info->wake_thread); | |
1645 | ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info, | |
1646 | "kssif%4.4x", thread_num); | |
1647 | if (IS_ERR(ssif_info->thread)) { | |
1648 | rv = PTR_ERR(ssif_info->thread); | |
1649 | dev_notice(&ssif_info->client->dev, | |
1650 | "Could not start kernel thread: error %d\n", | |
1651 | rv); | |
1652 | goto out; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | rv = ipmi_register_smi(&ssif_info->handlers, | |
1657 | ssif_info, | |
1658 | &ssif_info->device_id, | |
1659 | &ssif_info->client->dev, | |
1660 | slave_addr); | |
1661 | if (rv) { | |
1662 | pr_err(PFX "Unable to register device: error %d\n", rv); | |
1663 | goto out; | |
1664 | } | |
1665 | ||
1666 | rv = ipmi_smi_add_proc_entry(ssif_info->intf, "type", | |
1667 | &smi_type_proc_ops, | |
1668 | ssif_info); | |
1669 | if (rv) { | |
1670 | pr_err(PFX "Unable to create proc entry: %d\n", rv); | |
1671 | goto out_err_unreg; | |
1672 | } | |
1673 | ||
1674 | rv = ipmi_smi_add_proc_entry(ssif_info->intf, "ssif_stats", | |
1675 | &smi_stats_proc_ops, | |
1676 | ssif_info); | |
1677 | if (rv) { | |
1678 | pr_err(PFX "Unable to create proc entry: %d\n", rv); | |
1679 | goto out_err_unreg; | |
1680 | } | |
1681 | ||
1682 | out: | |
1683 | if (rv) | |
1684 | kfree(ssif_info); | |
1685 | kfree(resp); | |
1686 | return rv; | |
1687 | ||
1688 | out_err_unreg: | |
1689 | ipmi_unregister_smi(ssif_info->intf); | |
1690 | goto out; | |
1691 | } | |
1692 | ||
1693 | static int ssif_adapter_handler(struct device *adev, void *opaque) | |
1694 | { | |
1695 | struct ssif_addr_info *addr_info = opaque; | |
1696 | ||
1697 | if (adev->type != &i2c_adapter_type) | |
1698 | return 0; | |
1699 | ||
1700 | i2c_new_device(to_i2c_adapter(adev), &addr_info->binfo); | |
1701 | ||
1702 | if (!addr_info->adapter_name) | |
1703 | return 1; /* Only try the first I2C adapter by default. */ | |
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | static int new_ssif_client(int addr, char *adapter_name, | |
1708 | int debug, int slave_addr, | |
1709 | enum ipmi_addr_src addr_src) | |
1710 | { | |
1711 | struct ssif_addr_info *addr_info; | |
1712 | int rv = 0; | |
1713 | ||
1714 | mutex_lock(&ssif_infos_mutex); | |
1715 | if (ssif_info_find(addr, adapter_name, false)) { | |
1716 | rv = -EEXIST; | |
1717 | goto out_unlock; | |
1718 | } | |
1719 | ||
1720 | addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL); | |
1721 | if (!addr_info) { | |
1722 | rv = -ENOMEM; | |
1723 | goto out_unlock; | |
1724 | } | |
1725 | ||
1726 | if (adapter_name) { | |
1727 | addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL); | |
1728 | if (!addr_info->adapter_name) { | |
1729 | kfree(addr_info); | |
1730 | rv = -ENOMEM; | |
1731 | goto out_unlock; | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | strncpy(addr_info->binfo.type, DEVICE_NAME, | |
1736 | sizeof(addr_info->binfo.type)); | |
1737 | addr_info->binfo.addr = addr; | |
1738 | addr_info->binfo.platform_data = addr_info; | |
1739 | addr_info->debug = debug; | |
1740 | addr_info->slave_addr = slave_addr; | |
1741 | addr_info->addr_src = addr_src; | |
1742 | ||
1743 | list_add_tail(&addr_info->link, &ssif_infos); | |
1744 | ||
1745 | if (initialized) | |
1746 | i2c_for_each_dev(addr_info, ssif_adapter_handler); | |
1747 | /* Otherwise address list will get it */ | |
1748 | ||
1749 | out_unlock: | |
1750 | mutex_unlock(&ssif_infos_mutex); | |
1751 | return rv; | |
1752 | } | |
1753 | ||
1754 | static void free_ssif_clients(void) | |
1755 | { | |
1756 | struct ssif_addr_info *info, *tmp; | |
1757 | ||
1758 | mutex_lock(&ssif_infos_mutex); | |
1759 | list_for_each_entry_safe(info, tmp, &ssif_infos, link) { | |
1760 | list_del(&info->link); | |
1761 | kfree(info->adapter_name); | |
1762 | kfree(info); | |
1763 | } | |
1764 | mutex_unlock(&ssif_infos_mutex); | |
1765 | } | |
1766 | ||
1767 | static unsigned short *ssif_address_list(void) | |
1768 | { | |
1769 | struct ssif_addr_info *info; | |
1770 | unsigned int count = 0, i; | |
1771 | unsigned short *address_list; | |
1772 | ||
1773 | list_for_each_entry(info, &ssif_infos, link) | |
1774 | count++; | |
1775 | ||
1776 | address_list = kzalloc(sizeof(*address_list) * (count + 1), GFP_KERNEL); | |
1777 | if (!address_list) | |
1778 | return NULL; | |
1779 | ||
1780 | i = 0; | |
1781 | list_for_each_entry(info, &ssif_infos, link) { | |
1782 | unsigned short addr = info->binfo.addr; | |
1783 | int j; | |
1784 | ||
1785 | for (j = 0; j < i; j++) { | |
1786 | if (address_list[j] == addr) | |
1787 | goto skip_addr; | |
1788 | } | |
1789 | address_list[i] = addr; | |
1790 | skip_addr: | |
1791 | i++; | |
1792 | } | |
1793 | address_list[i] = I2C_CLIENT_END; | |
1794 | ||
1795 | return address_list; | |
1796 | } | |
1797 | ||
1798 | #ifdef CONFIG_ACPI | |
5186cf9c | 1799 | static const struct acpi_device_id ssif_acpi_match[] = { |
25930707 CM |
1800 | { "IPI0001", 0 }, |
1801 | { }, | |
1802 | }; | |
1803 | MODULE_DEVICE_TABLE(acpi, ssif_acpi_match); | |
1804 | ||
1805 | /* | |
1806 | * Once we get an ACPI failure, we don't try any more, because we go | |
1807 | * through the tables sequentially. Once we don't find a table, there | |
1808 | * are no more. | |
1809 | */ | |
1810 | static int acpi_failure; | |
1811 | ||
1812 | /* | |
1813 | * Defined in the IPMI 2.0 spec. | |
1814 | */ | |
1815 | struct SPMITable { | |
1816 | s8 Signature[4]; | |
1817 | u32 Length; | |
1818 | u8 Revision; | |
1819 | u8 Checksum; | |
1820 | s8 OEMID[6]; | |
1821 | s8 OEMTableID[8]; | |
1822 | s8 OEMRevision[4]; | |
1823 | s8 CreatorID[4]; | |
1824 | s8 CreatorRevision[4]; | |
1825 | u8 InterfaceType; | |
1826 | u8 IPMIlegacy; | |
1827 | s16 SpecificationRevision; | |
1828 | ||
1829 | /* | |
1830 | * Bit 0 - SCI interrupt supported | |
1831 | * Bit 1 - I/O APIC/SAPIC | |
1832 | */ | |
1833 | u8 InterruptType; | |
1834 | ||
1835 | /* | |
1836 | * If bit 0 of InterruptType is set, then this is the SCI | |
1837 | * interrupt in the GPEx_STS register. | |
1838 | */ | |
1839 | u8 GPE; | |
1840 | ||
1841 | s16 Reserved; | |
1842 | ||
1843 | /* | |
1844 | * If bit 1 of InterruptType is set, then this is the I/O | |
1845 | * APIC/SAPIC interrupt. | |
1846 | */ | |
1847 | u32 GlobalSystemInterrupt; | |
1848 | ||
1849 | /* The actual register address. */ | |
1850 | struct acpi_generic_address addr; | |
1851 | ||
1852 | u8 UID[4]; | |
1853 | ||
1854 | s8 spmi_id[1]; /* A '\0' terminated array starts here. */ | |
1855 | }; | |
1856 | ||
1857 | static int try_init_spmi(struct SPMITable *spmi) | |
1858 | { | |
1859 | unsigned short myaddr; | |
1860 | ||
1861 | if (num_addrs >= MAX_SSIF_BMCS) | |
1862 | return -1; | |
1863 | ||
1864 | if (spmi->IPMIlegacy != 1) { | |
1865 | pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy); | |
1866 | return -ENODEV; | |
1867 | } | |
1868 | ||
1869 | if (spmi->InterfaceType != 4) | |
1870 | return -ENODEV; | |
1871 | ||
1872 | if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) { | |
1873 | pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n", | |
1874 | spmi->addr.space_id); | |
1875 | return -EIO; | |
1876 | } | |
1877 | ||
1878 | myaddr = spmi->addr.address >> 1; | |
1879 | ||
1880 | return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI); | |
1881 | } | |
1882 | ||
1883 | static void spmi_find_bmc(void) | |
1884 | { | |
1885 | acpi_status status; | |
1886 | struct SPMITable *spmi; | |
1887 | int i; | |
1888 | ||
1889 | if (acpi_disabled) | |
1890 | return; | |
1891 | ||
1892 | if (acpi_failure) | |
1893 | return; | |
1894 | ||
1895 | for (i = 0; ; i++) { | |
1896 | status = acpi_get_table(ACPI_SIG_SPMI, i+1, | |
1897 | (struct acpi_table_header **)&spmi); | |
1898 | if (status != AE_OK) | |
1899 | return; | |
1900 | ||
1901 | try_init_spmi(spmi); | |
1902 | } | |
1903 | } | |
1904 | #else | |
1905 | static void spmi_find_bmc(void) { } | |
1906 | #endif | |
1907 | ||
1908 | #ifdef CONFIG_DMI | |
1909 | static int decode_dmi(const struct dmi_device *dmi_dev) | |
1910 | { | |
1911 | struct dmi_header *dm = dmi_dev->device_data; | |
1912 | u8 *data = (u8 *) dm; | |
1913 | u8 len = dm->length; | |
1914 | unsigned short myaddr; | |
1915 | int slave_addr; | |
1916 | ||
1917 | if (num_addrs >= MAX_SSIF_BMCS) | |
1918 | return -1; | |
1919 | ||
1920 | if (len < 9) | |
1921 | return -1; | |
1922 | ||
1923 | if (data[0x04] != 4) /* Not SSIF */ | |
1924 | return -1; | |
1925 | ||
1926 | if ((data[8] >> 1) == 0) { | |
1927 | /* | |
1928 | * Some broken systems put the I2C address in | |
1929 | * the slave address field. We try to | |
1930 | * accommodate them here. | |
1931 | */ | |
1932 | myaddr = data[6] >> 1; | |
1933 | slave_addr = 0; | |
1934 | } else { | |
1935 | myaddr = data[8] >> 1; | |
1936 | slave_addr = data[6]; | |
1937 | } | |
1938 | ||
1939 | return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS); | |
1940 | } | |
1941 | ||
1942 | static void dmi_iterator(void) | |
1943 | { | |
1944 | const struct dmi_device *dev = NULL; | |
1945 | ||
1946 | while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) | |
1947 | decode_dmi(dev); | |
1948 | } | |
1949 | #else | |
1950 | static void dmi_iterator(void) { } | |
1951 | #endif | |
1952 | ||
1953 | static const struct i2c_device_id ssif_id[] = { | |
1954 | { DEVICE_NAME, 0 }, | |
1955 | { } | |
1956 | }; | |
1957 | MODULE_DEVICE_TABLE(i2c, ssif_id); | |
1958 | ||
1959 | static struct i2c_driver ssif_i2c_driver = { | |
1960 | .class = I2C_CLASS_HWMON, | |
1961 | .driver = { | |
25930707 CM |
1962 | .name = DEVICE_NAME |
1963 | }, | |
1964 | .probe = ssif_probe, | |
1965 | .remove = ssif_remove, | |
91620521 | 1966 | .alert = ssif_alert, |
25930707 CM |
1967 | .id_table = ssif_id, |
1968 | .detect = ssif_detect | |
1969 | }; | |
1970 | ||
1971 | static int init_ipmi_ssif(void) | |
1972 | { | |
1973 | int i; | |
1974 | int rv; | |
1975 | ||
1976 | if (initialized) | |
1977 | return 0; | |
1978 | ||
1979 | pr_info("IPMI SSIF Interface driver\n"); | |
1980 | ||
1981 | /* build list for i2c from addr list */ | |
1982 | for (i = 0; i < num_addrs; i++) { | |
1983 | rv = new_ssif_client(addr[i], adapter_name[i], | |
1984 | dbg[i], slave_addrs[i], | |
1985 | SI_HARDCODED); | |
d467f7a4 | 1986 | if (rv) |
25930707 CM |
1987 | pr_err(PFX |
1988 | "Couldn't add hardcoded device at addr 0x%x\n", | |
1989 | addr[i]); | |
1990 | } | |
1991 | ||
1992 | if (ssif_tryacpi) | |
1993 | ssif_i2c_driver.driver.acpi_match_table = | |
1994 | ACPI_PTR(ssif_acpi_match); | |
1995 | if (ssif_trydmi) | |
1996 | dmi_iterator(); | |
1997 | if (ssif_tryacpi) | |
1998 | spmi_find_bmc(); | |
1999 | ||
2000 | ssif_i2c_driver.address_list = ssif_address_list(); | |
2001 | ||
2002 | rv = i2c_add_driver(&ssif_i2c_driver); | |
2003 | if (!rv) | |
2004 | initialized = true; | |
2005 | ||
2006 | return rv; | |
2007 | } | |
2008 | module_init(init_ipmi_ssif); | |
2009 | ||
2010 | static void cleanup_ipmi_ssif(void) | |
2011 | { | |
2012 | if (!initialized) | |
2013 | return; | |
2014 | ||
2015 | initialized = false; | |
2016 | ||
2017 | i2c_del_driver(&ssif_i2c_driver); | |
2018 | ||
2019 | free_ssif_clients(); | |
2020 | } | |
2021 | module_exit(cleanup_ipmi_ssif); | |
2022 | ||
2023 | MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>"); | |
2024 | MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus"); | |
2025 | MODULE_LICENSE("GPL"); |