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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> |
25930707 CM |
55 | |
56 | #define PFX "ipmi_ssif: " | |
57 | #define DEVICE_NAME "ipmi_ssif" | |
58 | ||
59 | #define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57 | |
60 | ||
61 | #define SSIF_IPMI_REQUEST 2 | |
62 | #define SSIF_IPMI_MULTI_PART_REQUEST_START 6 | |
63 | #define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7 | |
64 | #define SSIF_IPMI_RESPONSE 3 | |
65 | #define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9 | |
66 | ||
67 | /* ssif_debug is a bit-field | |
68 | * SSIF_DEBUG_MSG - commands and their responses | |
69 | * SSIF_DEBUG_STATES - message states | |
70 | * SSIF_DEBUG_TIMING - Measure times between events in the driver | |
71 | */ | |
72 | #define SSIF_DEBUG_TIMING 4 | |
73 | #define SSIF_DEBUG_STATE 2 | |
74 | #define SSIF_DEBUG_MSG 1 | |
75 | #define SSIF_NODEBUG 0 | |
76 | #define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG) | |
77 | ||
78 | /* | |
79 | * Timer values | |
80 | */ | |
81 | #define SSIF_MSG_USEC 20000 /* 20ms between message tries. */ | |
82 | #define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */ | |
83 | ||
84 | /* How many times to we retry sending/receiving the message. */ | |
85 | #define SSIF_SEND_RETRIES 5 | |
86 | #define SSIF_RECV_RETRIES 250 | |
87 | ||
88 | #define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000) | |
89 | #define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC) | |
90 | #define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC) | |
91 | ||
92 | enum ssif_intf_state { | |
93 | SSIF_NORMAL, | |
94 | SSIF_GETTING_FLAGS, | |
95 | SSIF_GETTING_EVENTS, | |
96 | SSIF_CLEARING_FLAGS, | |
97 | SSIF_GETTING_MESSAGES, | |
98 | /* FIXME - add watchdog stuff. */ | |
99 | }; | |
100 | ||
101 | #define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \ | |
102 | && (ssif)->curr_msg == NULL) | |
103 | ||
104 | /* | |
105 | * Indexes into stats[] in ssif_info below. | |
106 | */ | |
107 | enum ssif_stat_indexes { | |
108 | /* Number of total messages sent. */ | |
109 | SSIF_STAT_sent_messages = 0, | |
110 | ||
111 | /* | |
112 | * Number of message parts sent. Messages may be broken into | |
113 | * parts if they are long. | |
114 | */ | |
115 | SSIF_STAT_sent_messages_parts, | |
116 | ||
117 | /* | |
118 | * Number of time a message was retried. | |
119 | */ | |
120 | SSIF_STAT_send_retries, | |
121 | ||
122 | /* | |
123 | * Number of times the send of a message failed. | |
124 | */ | |
125 | SSIF_STAT_send_errors, | |
126 | ||
127 | /* | |
128 | * Number of message responses received. | |
129 | */ | |
130 | SSIF_STAT_received_messages, | |
131 | ||
132 | /* | |
133 | * Number of message fragments received. | |
134 | */ | |
135 | SSIF_STAT_received_message_parts, | |
136 | ||
137 | /* | |
138 | * Number of times the receive of a message was retried. | |
139 | */ | |
140 | SSIF_STAT_receive_retries, | |
141 | ||
142 | /* | |
143 | * Number of errors receiving messages. | |
144 | */ | |
145 | SSIF_STAT_receive_errors, | |
146 | ||
147 | /* | |
148 | * Number of times a flag fetch was requested. | |
149 | */ | |
150 | SSIF_STAT_flag_fetches, | |
151 | ||
152 | /* | |
153 | * Number of times the hardware didn't follow the state machine. | |
154 | */ | |
155 | SSIF_STAT_hosed, | |
156 | ||
157 | /* | |
158 | * Number of received events. | |
159 | */ | |
160 | SSIF_STAT_events, | |
161 | ||
162 | /* Number of asyncronous messages received. */ | |
163 | SSIF_STAT_incoming_messages, | |
164 | ||
165 | /* Number of watchdog pretimeouts. */ | |
166 | SSIF_STAT_watchdog_pretimeouts, | |
167 | ||
91620521 CM |
168 | /* Number of alers received. */ |
169 | SSIF_STAT_alerts, | |
170 | ||
25930707 CM |
171 | /* Always add statistics before this value, it must be last. */ |
172 | SSIF_NUM_STATS | |
173 | }; | |
174 | ||
175 | struct ssif_addr_info { | |
176 | unsigned short addr; | |
177 | struct i2c_board_info binfo; | |
178 | char *adapter_name; | |
179 | int debug; | |
180 | int slave_addr; | |
181 | enum ipmi_addr_src addr_src; | |
182 | union ipmi_smi_info_union addr_info; | |
183 | ||
184 | struct mutex clients_mutex; | |
185 | struct list_head clients; | |
186 | ||
187 | struct list_head link; | |
188 | }; | |
189 | ||
190 | struct ssif_info; | |
191 | ||
192 | typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result, | |
193 | unsigned char *data, unsigned int len); | |
194 | ||
195 | struct ssif_info { | |
196 | ipmi_smi_t intf; | |
197 | int intf_num; | |
198 | spinlock_t lock; | |
199 | struct ipmi_smi_msg *waiting_msg; | |
200 | struct ipmi_smi_msg *curr_msg; | |
201 | enum ssif_intf_state ssif_state; | |
202 | unsigned long ssif_debug; | |
203 | ||
204 | struct ipmi_smi_handlers handlers; | |
205 | ||
206 | enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */ | |
207 | union ipmi_smi_info_union addr_info; | |
208 | ||
209 | /* | |
210 | * Flags from the last GET_MSG_FLAGS command, used when an ATTN | |
211 | * is set to hold the flags until we are done handling everything | |
212 | * from the flags. | |
213 | */ | |
214 | #define RECEIVE_MSG_AVAIL 0x01 | |
215 | #define EVENT_MSG_BUFFER_FULL 0x02 | |
216 | #define WDT_PRE_TIMEOUT_INT 0x08 | |
217 | unsigned char msg_flags; | |
218 | ||
91620521 | 219 | u8 global_enables; |
25930707 | 220 | bool has_event_buffer; |
91620521 CM |
221 | bool supports_alert; |
222 | ||
223 | /* | |
224 | * Used to tell what we should do with alerts. If we are | |
225 | * waiting on a response, read the data immediately. | |
226 | */ | |
227 | bool got_alert; | |
228 | bool waiting_alert; | |
25930707 CM |
229 | |
230 | /* | |
231 | * If set to true, this will request events the next time the | |
232 | * state machine is idle. | |
233 | */ | |
234 | bool req_events; | |
235 | ||
236 | /* | |
237 | * If set to true, this will request flags the next time the | |
238 | * state machine is idle. | |
239 | */ | |
240 | bool req_flags; | |
241 | ||
242 | /* | |
243 | * Used to perform timer operations when run-to-completion | |
244 | * mode is on. This is a countdown timer. | |
245 | */ | |
246 | int rtc_us_timer; | |
247 | ||
248 | /* Used for sending/receiving data. +1 for the length. */ | |
249 | unsigned char data[IPMI_MAX_MSG_LENGTH + 1]; | |
250 | unsigned int data_len; | |
251 | ||
252 | /* Temp receive buffer, gets copied into data. */ | |
253 | unsigned char recv[I2C_SMBUS_BLOCK_MAX]; | |
254 | ||
255 | struct i2c_client *client; | |
256 | ssif_i2c_done done_handler; | |
257 | ||
258 | /* Thread interface handling */ | |
259 | struct task_struct *thread; | |
260 | struct completion wake_thread; | |
261 | bool stopping; | |
262 | int i2c_read_write; | |
263 | int i2c_command; | |
264 | unsigned char *i2c_data; | |
265 | unsigned int i2c_size; | |
266 | ||
267 | /* From the device id response. */ | |
268 | struct ipmi_device_id device_id; | |
269 | ||
270 | struct timer_list retry_timer; | |
271 | int retries_left; | |
272 | ||
273 | /* Info from SSIF cmd */ | |
274 | unsigned char max_xmit_msg_size; | |
275 | unsigned char max_recv_msg_size; | |
276 | unsigned int multi_support; | |
277 | int supports_pec; | |
278 | ||
279 | #define SSIF_NO_MULTI 0 | |
280 | #define SSIF_MULTI_2_PART 1 | |
281 | #define SSIF_MULTI_n_PART 2 | |
282 | unsigned char *multi_data; | |
283 | unsigned int multi_len; | |
284 | unsigned int multi_pos; | |
285 | ||
286 | atomic_t stats[SSIF_NUM_STATS]; | |
287 | }; | |
288 | ||
289 | #define ssif_inc_stat(ssif, stat) \ | |
290 | atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat]) | |
291 | #define ssif_get_stat(ssif, stat) \ | |
292 | ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat])) | |
293 | ||
294 | static bool initialized; | |
295 | ||
296 | static atomic_t next_intf = ATOMIC_INIT(0); | |
297 | ||
298 | static void return_hosed_msg(struct ssif_info *ssif_info, | |
299 | struct ipmi_smi_msg *msg); | |
300 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags); | |
301 | static int start_send(struct ssif_info *ssif_info, | |
302 | unsigned char *data, | |
303 | unsigned int len); | |
304 | ||
305 | static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info, | |
306 | unsigned long *flags) | |
307 | { | |
308 | spin_lock_irqsave(&ssif_info->lock, *flags); | |
309 | return flags; | |
310 | } | |
311 | ||
312 | static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info, | |
313 | unsigned long *flags) | |
314 | { | |
315 | spin_unlock_irqrestore(&ssif_info->lock, *flags); | |
316 | } | |
317 | ||
318 | static void deliver_recv_msg(struct ssif_info *ssif_info, | |
319 | struct ipmi_smi_msg *msg) | |
320 | { | |
321 | ipmi_smi_t intf = ssif_info->intf; | |
322 | ||
323 | if (!intf) { | |
324 | ipmi_free_smi_msg(msg); | |
325 | } else if (msg->rsp_size < 0) { | |
326 | return_hosed_msg(ssif_info, msg); | |
327 | pr_err(PFX | |
328 | "Malformed message in deliver_recv_msg: rsp_size = %d\n", | |
329 | msg->rsp_size); | |
330 | } else { | |
331 | ipmi_smi_msg_received(intf, msg); | |
332 | } | |
333 | } | |
334 | ||
335 | static void return_hosed_msg(struct ssif_info *ssif_info, | |
336 | struct ipmi_smi_msg *msg) | |
337 | { | |
338 | ssif_inc_stat(ssif_info, hosed); | |
339 | ||
340 | /* Make it a response */ | |
341 | msg->rsp[0] = msg->data[0] | 4; | |
342 | msg->rsp[1] = msg->data[1]; | |
343 | msg->rsp[2] = 0xFF; /* Unknown error. */ | |
344 | msg->rsp_size = 3; | |
345 | ||
346 | deliver_recv_msg(ssif_info, msg); | |
347 | } | |
348 | ||
349 | /* | |
350 | * Must be called with the message lock held. This will release the | |
351 | * message lock. Note that the caller will check SSIF_IDLE and start a | |
352 | * new operation, so there is no need to check for new messages to | |
353 | * start in here. | |
354 | */ | |
355 | static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
356 | { | |
357 | unsigned char msg[3]; | |
358 | ||
359 | ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; | |
360 | ssif_info->ssif_state = SSIF_CLEARING_FLAGS; | |
361 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
362 | ||
363 | /* Make sure the watchdog pre-timeout flag is not set at startup. */ | |
364 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
365 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
366 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
367 | ||
368 | if (start_send(ssif_info, msg, 3) != 0) { | |
369 | /* Error, just go to normal state. */ | |
370 | ssif_info->ssif_state = SSIF_NORMAL; | |
371 | } | |
372 | } | |
373 | ||
374 | static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags) | |
375 | { | |
376 | unsigned char mb[2]; | |
377 | ||
378 | ssif_info->req_flags = false; | |
379 | ssif_info->ssif_state = SSIF_GETTING_FLAGS; | |
380 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
381 | ||
382 | mb[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
383 | mb[1] = IPMI_GET_MSG_FLAGS_CMD; | |
384 | if (start_send(ssif_info, mb, 2) != 0) | |
385 | ssif_info->ssif_state = SSIF_NORMAL; | |
386 | } | |
387 | ||
388 | static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags, | |
389 | struct ipmi_smi_msg *msg) | |
390 | { | |
391 | if (start_send(ssif_info, msg->data, msg->data_size) != 0) { | |
392 | unsigned long oflags; | |
393 | ||
394 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
395 | ssif_info->curr_msg = NULL; | |
396 | ssif_info->ssif_state = SSIF_NORMAL; | |
397 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
398 | ipmi_free_smi_msg(msg); | |
399 | } | |
400 | } | |
401 | ||
402 | static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags) | |
403 | { | |
404 | struct ipmi_smi_msg *msg; | |
405 | ||
406 | ssif_info->req_events = false; | |
407 | ||
408 | msg = ipmi_alloc_smi_msg(); | |
409 | if (!msg) { | |
410 | ssif_info->ssif_state = SSIF_NORMAL; | |
411 | return; | |
412 | } | |
413 | ||
414 | ssif_info->curr_msg = msg; | |
415 | ssif_info->ssif_state = SSIF_GETTING_EVENTS; | |
416 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
417 | ||
418 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
419 | msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; | |
420 | msg->data_size = 2; | |
421 | ||
422 | check_start_send(ssif_info, flags, msg); | |
423 | } | |
424 | ||
425 | static void start_recv_msg_fetch(struct ssif_info *ssif_info, | |
426 | unsigned long *flags) | |
427 | { | |
428 | struct ipmi_smi_msg *msg; | |
429 | ||
430 | msg = ipmi_alloc_smi_msg(); | |
431 | if (!msg) { | |
432 | ssif_info->ssif_state = SSIF_NORMAL; | |
433 | return; | |
434 | } | |
435 | ||
436 | ssif_info->curr_msg = msg; | |
437 | ssif_info->ssif_state = SSIF_GETTING_MESSAGES; | |
438 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
439 | ||
440 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
441 | msg->data[1] = IPMI_GET_MSG_CMD; | |
442 | msg->data_size = 2; | |
443 | ||
444 | check_start_send(ssif_info, flags, msg); | |
445 | } | |
446 | ||
447 | /* | |
448 | * Must be called with the message lock held. This will release the | |
449 | * message lock. Note that the caller will check SSIF_IDLE and start a | |
450 | * new operation, so there is no need to check for new messages to | |
451 | * start in here. | |
452 | */ | |
453 | static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
454 | { | |
455 | if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) { | |
456 | ipmi_smi_t intf = ssif_info->intf; | |
457 | /* Watchdog pre-timeout */ | |
458 | ssif_inc_stat(ssif_info, watchdog_pretimeouts); | |
459 | start_clear_flags(ssif_info, flags); | |
460 | if (intf) | |
461 | ipmi_smi_watchdog_pretimeout(intf); | |
462 | } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL) | |
463 | /* Messages available. */ | |
464 | start_recv_msg_fetch(ssif_info, flags); | |
465 | else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL) | |
466 | /* Events available. */ | |
467 | start_event_fetch(ssif_info, flags); | |
468 | else { | |
469 | ssif_info->ssif_state = SSIF_NORMAL; | |
470 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
471 | } | |
472 | } | |
473 | ||
474 | static int ipmi_ssif_thread(void *data) | |
475 | { | |
476 | struct ssif_info *ssif_info = data; | |
477 | ||
478 | while (!kthread_should_stop()) { | |
479 | int result; | |
480 | ||
481 | /* Wait for something to do */ | |
d0acf734 CM |
482 | result = wait_for_completion_interruptible( |
483 | &ssif_info->wake_thread); | |
25930707 CM |
484 | if (ssif_info->stopping) |
485 | break; | |
d0acf734 CM |
486 | if (result == -ERESTARTSYS) |
487 | continue; | |
488 | init_completion(&ssif_info->wake_thread); | |
25930707 CM |
489 | |
490 | if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) { | |
491 | result = i2c_smbus_write_block_data( | |
492 | ssif_info->client, SSIF_IPMI_REQUEST, | |
493 | ssif_info->i2c_data[0], | |
494 | ssif_info->i2c_data + 1); | |
495 | ssif_info->done_handler(ssif_info, result, NULL, 0); | |
496 | } else { | |
497 | result = i2c_smbus_read_block_data( | |
498 | ssif_info->client, SSIF_IPMI_RESPONSE, | |
499 | ssif_info->i2c_data); | |
500 | if (result < 0) | |
501 | ssif_info->done_handler(ssif_info, result, | |
502 | NULL, 0); | |
503 | else | |
504 | ssif_info->done_handler(ssif_info, 0, | |
505 | ssif_info->i2c_data, | |
506 | result); | |
507 | } | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static int ssif_i2c_send(struct ssif_info *ssif_info, | |
514 | ssif_i2c_done handler, | |
515 | int read_write, int command, | |
516 | unsigned char *data, unsigned int size) | |
517 | { | |
518 | ssif_info->done_handler = handler; | |
519 | ||
520 | ssif_info->i2c_read_write = read_write; | |
521 | ssif_info->i2c_command = command; | |
522 | ssif_info->i2c_data = data; | |
523 | ssif_info->i2c_size = size; | |
524 | complete(&ssif_info->wake_thread); | |
525 | return 0; | |
526 | } | |
527 | ||
528 | ||
529 | static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
530 | unsigned char *data, unsigned int len); | |
531 | ||
91620521 | 532 | static void start_get(struct ssif_info *ssif_info) |
25930707 | 533 | { |
25930707 CM |
534 | int rv; |
535 | ||
25930707 CM |
536 | ssif_info->rtc_us_timer = 0; |
537 | ||
538 | rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, | |
539 | SSIF_IPMI_RESPONSE, | |
540 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
541 | if (rv < 0) { | |
542 | /* request failed, just return the error. */ | |
543 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
544 | pr_info("Error from i2c_non_blocking_op(5)\n"); | |
545 | ||
546 | msg_done_handler(ssif_info, -EIO, NULL, 0); | |
547 | } | |
548 | } | |
549 | ||
91620521 CM |
550 | static void retry_timeout(unsigned long data) |
551 | { | |
552 | struct ssif_info *ssif_info = (void *) data; | |
553 | unsigned long oflags, *flags; | |
554 | bool waiting; | |
555 | ||
556 | if (ssif_info->stopping) | |
557 | return; | |
558 | ||
559 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
560 | waiting = ssif_info->waiting_alert; | |
561 | ssif_info->waiting_alert = false; | |
562 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
563 | ||
564 | if (waiting) | |
565 | start_get(ssif_info); | |
566 | } | |
567 | ||
568 | ||
569 | static void ssif_alert(struct i2c_client *client, unsigned int data) | |
570 | { | |
571 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
572 | unsigned long oflags, *flags; | |
573 | bool do_get = false; | |
574 | ||
575 | ssif_inc_stat(ssif_info, alerts); | |
576 | ||
577 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
578 | if (ssif_info->waiting_alert) { | |
579 | ssif_info->waiting_alert = false; | |
580 | del_timer(&ssif_info->retry_timer); | |
581 | do_get = true; | |
582 | } else if (ssif_info->curr_msg) { | |
583 | ssif_info->got_alert = true; | |
584 | } | |
585 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
586 | if (do_get) | |
587 | start_get(ssif_info); | |
588 | } | |
589 | ||
25930707 CM |
590 | static int start_resend(struct ssif_info *ssif_info); |
591 | ||
592 | static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
593 | unsigned char *data, unsigned int len) | |
594 | { | |
595 | struct ipmi_smi_msg *msg; | |
596 | unsigned long oflags, *flags; | |
597 | int rv; | |
598 | ||
599 | /* | |
600 | * We are single-threaded here, so no need for a lock until we | |
601 | * start messing with driver states or the queues. | |
602 | */ | |
603 | ||
604 | if (result < 0) { | |
605 | ssif_info->retries_left--; | |
606 | if (ssif_info->retries_left > 0) { | |
607 | ssif_inc_stat(ssif_info, receive_retries); | |
608 | ||
91620521 CM |
609 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
610 | ssif_info->waiting_alert = true; | |
611 | ssif_info->rtc_us_timer = SSIF_MSG_USEC; | |
25930707 CM |
612 | mod_timer(&ssif_info->retry_timer, |
613 | jiffies + SSIF_MSG_JIFFIES); | |
91620521 | 614 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
615 | return; |
616 | } | |
617 | ||
618 | ssif_inc_stat(ssif_info, receive_errors); | |
619 | ||
620 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
621 | pr_info("Error in msg_done_handler: %d\n", result); | |
622 | len = 0; | |
623 | goto continue_op; | |
624 | } | |
625 | ||
626 | if ((len > 1) && (ssif_info->multi_pos == 0) | |
627 | && (data[0] == 0x00) && (data[1] == 0x01)) { | |
628 | /* Start of multi-part read. Start the next transaction. */ | |
629 | int i; | |
630 | ||
631 | ssif_inc_stat(ssif_info, received_message_parts); | |
632 | ||
633 | /* Remove the multi-part read marker. */ | |
634 | for (i = 0; i < (len-2); i++) | |
635 | ssif_info->data[i] = data[i+2]; | |
636 | len -= 2; | |
637 | ssif_info->multi_len = len; | |
638 | ssif_info->multi_pos = 1; | |
639 | ||
640 | rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, | |
641 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
642 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
643 | if (rv < 0) { | |
644 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
645 | pr_info("Error from i2c_non_blocking_op(1)\n"); | |
646 | ||
647 | result = -EIO; | |
648 | } else | |
649 | return; | |
650 | } else if (ssif_info->multi_pos) { | |
651 | /* Middle of multi-part read. Start the next transaction. */ | |
652 | int i; | |
653 | unsigned char blocknum; | |
654 | ||
655 | if (len == 0) { | |
656 | result = -EIO; | |
657 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
658 | pr_info(PFX "Middle message with no data\n"); | |
659 | ||
660 | goto continue_op; | |
661 | } | |
662 | ||
663 | blocknum = data[ssif_info->multi_len]; | |
664 | ||
665 | if (ssif_info->multi_len+len-1 > IPMI_MAX_MSG_LENGTH) { | |
666 | /* Received message too big, abort the operation. */ | |
667 | result = -E2BIG; | |
668 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
669 | pr_info("Received message too big\n"); | |
670 | ||
671 | goto continue_op; | |
672 | } | |
673 | ||
674 | /* Remove the blocknum from the data. */ | |
675 | for (i = 0; i < (len-1); i++) | |
676 | ssif_info->data[i+ssif_info->multi_len] = data[i+1]; | |
677 | len--; | |
678 | ssif_info->multi_len += len; | |
679 | if (blocknum == 0xff) { | |
680 | /* End of read */ | |
681 | len = ssif_info->multi_len; | |
682 | data = ssif_info->data; | |
683 | } else if ((blocknum+1) != ssif_info->multi_pos) { | |
684 | /* | |
685 | * Out of sequence block, just abort. Block | |
686 | * numbers start at zero for the second block, | |
687 | * but multi_pos starts at one, so the +1. | |
688 | */ | |
689 | result = -EIO; | |
690 | } else { | |
691 | ssif_inc_stat(ssif_info, received_message_parts); | |
692 | ||
693 | ssif_info->multi_pos++; | |
694 | ||
695 | rv = ssif_i2c_send(ssif_info, msg_done_handler, | |
696 | I2C_SMBUS_READ, | |
697 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
698 | ssif_info->recv, | |
699 | I2C_SMBUS_BLOCK_DATA); | |
700 | if (rv < 0) { | |
701 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
702 | pr_info(PFX | |
91620521 | 703 | "Error from ssif_i2c_send\n"); |
25930707 CM |
704 | |
705 | result = -EIO; | |
706 | } else | |
707 | return; | |
708 | } | |
709 | } | |
710 | ||
711 | if (result < 0) { | |
712 | ssif_inc_stat(ssif_info, receive_errors); | |
713 | } else { | |
714 | ssif_inc_stat(ssif_info, received_messages); | |
715 | ssif_inc_stat(ssif_info, received_message_parts); | |
716 | } | |
717 | ||
718 | ||
719 | continue_op: | |
720 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) | |
721 | pr_info(PFX "DONE 1: state = %d, result=%d.\n", | |
722 | ssif_info->ssif_state, result); | |
723 | ||
724 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
725 | msg = ssif_info->curr_msg; | |
726 | if (msg) { | |
727 | msg->rsp_size = len; | |
728 | if (msg->rsp_size > IPMI_MAX_MSG_LENGTH) | |
729 | msg->rsp_size = IPMI_MAX_MSG_LENGTH; | |
730 | memcpy(msg->rsp, data, msg->rsp_size); | |
731 | ssif_info->curr_msg = NULL; | |
732 | } | |
733 | ||
734 | switch (ssif_info->ssif_state) { | |
735 | case SSIF_NORMAL: | |
736 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
737 | if (!msg) | |
738 | break; | |
739 | ||
740 | if (result < 0) | |
741 | return_hosed_msg(ssif_info, msg); | |
742 | else | |
743 | deliver_recv_msg(ssif_info, msg); | |
744 | break; | |
745 | ||
746 | case SSIF_GETTING_FLAGS: | |
747 | /* We got the flags from the SSIF, now handle them. */ | |
748 | if ((result < 0) || (len < 4) || (data[2] != 0)) { | |
749 | /* | |
750 | * Error fetching flags, or invalid length, | |
751 | * just give up for now. | |
752 | */ | |
753 | ssif_info->ssif_state = SSIF_NORMAL; | |
754 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
755 | pr_warn(PFX "Error getting flags: %d %d, %x\n", | |
756 | result, len, data[2]); | |
757 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
758 | || data[1] != IPMI_GET_MSG_FLAGS_CMD) { | |
759 | pr_warn(PFX "Invalid response getting flags: %x %x\n", | |
760 | data[0], data[1]); | |
761 | } else { | |
762 | ssif_inc_stat(ssif_info, flag_fetches); | |
763 | ssif_info->msg_flags = data[3]; | |
764 | handle_flags(ssif_info, flags); | |
765 | } | |
766 | break; | |
767 | ||
768 | case SSIF_CLEARING_FLAGS: | |
769 | /* We cleared the flags. */ | |
770 | if ((result < 0) || (len < 3) || (data[2] != 0)) { | |
771 | /* Error clearing flags */ | |
772 | pr_warn(PFX "Error clearing flags: %d %d, %x\n", | |
773 | result, len, data[2]); | |
774 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
775 | || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) { | |
776 | pr_warn(PFX "Invalid response clearing flags: %x %x\n", | |
777 | data[0], data[1]); | |
778 | } | |
779 | ssif_info->ssif_state = SSIF_NORMAL; | |
780 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
781 | break; | |
782 | ||
783 | case SSIF_GETTING_EVENTS: | |
784 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { | |
785 | /* Error getting event, probably done. */ | |
786 | msg->done(msg); | |
787 | ||
788 | /* Take off the event flag. */ | |
789 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
790 | handle_flags(ssif_info, flags); | |
791 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
792 | || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) { | |
793 | pr_warn(PFX "Invalid response getting events: %x %x\n", | |
794 | msg->rsp[0], msg->rsp[1]); | |
795 | msg->done(msg); | |
796 | /* Take off the event flag. */ | |
797 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
798 | handle_flags(ssif_info, flags); | |
799 | } else { | |
800 | handle_flags(ssif_info, flags); | |
801 | ssif_inc_stat(ssif_info, events); | |
802 | deliver_recv_msg(ssif_info, msg); | |
803 | } | |
804 | break; | |
805 | ||
806 | case SSIF_GETTING_MESSAGES: | |
807 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { | |
808 | /* Error getting event, probably done. */ | |
809 | msg->done(msg); | |
810 | ||
811 | /* Take off the msg flag. */ | |
812 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
813 | handle_flags(ssif_info, flags); | |
814 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
815 | || msg->rsp[1] != IPMI_GET_MSG_CMD) { | |
816 | pr_warn(PFX "Invalid response clearing flags: %x %x\n", | |
817 | msg->rsp[0], msg->rsp[1]); | |
818 | msg->done(msg); | |
819 | ||
820 | /* Take off the msg flag. */ | |
821 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
822 | handle_flags(ssif_info, flags); | |
823 | } else { | |
824 | ssif_inc_stat(ssif_info, incoming_messages); | |
825 | handle_flags(ssif_info, flags); | |
826 | deliver_recv_msg(ssif_info, msg); | |
827 | } | |
828 | break; | |
829 | } | |
830 | ||
831 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
832 | if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) { | |
833 | if (ssif_info->req_events) | |
834 | start_event_fetch(ssif_info, flags); | |
835 | else if (ssif_info->req_flags) | |
836 | start_flag_fetch(ssif_info, flags); | |
837 | else | |
838 | start_next_msg(ssif_info, flags); | |
839 | } else | |
840 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
841 | ||
842 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) | |
843 | pr_info(PFX "DONE 2: state = %d.\n", ssif_info->ssif_state); | |
844 | } | |
845 | ||
846 | static void msg_written_handler(struct ssif_info *ssif_info, int result, | |
847 | unsigned char *data, unsigned int len) | |
848 | { | |
849 | int rv; | |
850 | ||
851 | /* We are single-threaded here, so no need for a lock. */ | |
852 | if (result < 0) { | |
853 | ssif_info->retries_left--; | |
854 | if (ssif_info->retries_left > 0) { | |
855 | if (!start_resend(ssif_info)) { | |
856 | ssif_inc_stat(ssif_info, send_retries); | |
857 | return; | |
858 | } | |
859 | /* request failed, just return the error. */ | |
860 | ssif_inc_stat(ssif_info, send_errors); | |
861 | ||
862 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
863 | pr_info(PFX | |
864 | "Out of retries in msg_written_handler\n"); | |
865 | msg_done_handler(ssif_info, -EIO, NULL, 0); | |
866 | return; | |
867 | } | |
868 | ||
869 | ssif_inc_stat(ssif_info, send_errors); | |
870 | ||
871 | /* | |
872 | * Got an error on transmit, let the done routine | |
873 | * handle it. | |
874 | */ | |
875 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
876 | pr_info("Error in msg_written_handler: %d\n", result); | |
877 | ||
878 | msg_done_handler(ssif_info, result, NULL, 0); | |
879 | return; | |
880 | } | |
881 | ||
882 | if (ssif_info->multi_data) { | |
883 | /* In the middle of a multi-data write. */ | |
884 | int left; | |
885 | ||
886 | ssif_inc_stat(ssif_info, sent_messages_parts); | |
887 | ||
888 | left = ssif_info->multi_len - ssif_info->multi_pos; | |
889 | if (left > 32) | |
890 | left = 32; | |
891 | /* Length byte. */ | |
892 | ssif_info->multi_data[ssif_info->multi_pos] = left; | |
893 | ssif_info->multi_pos += left; | |
894 | if (left < 32) | |
895 | /* | |
896 | * Write is finished. Note that we must end | |
897 | * with a write of less than 32 bytes to | |
898 | * complete the transaction, even if it is | |
899 | * zero bytes. | |
900 | */ | |
901 | ssif_info->multi_data = NULL; | |
902 | ||
903 | rv = ssif_i2c_send(ssif_info, msg_written_handler, | |
904 | I2C_SMBUS_WRITE, | |
905 | SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, | |
906 | ssif_info->multi_data + ssif_info->multi_pos, | |
907 | I2C_SMBUS_BLOCK_DATA); | |
908 | if (rv < 0) { | |
909 | /* request failed, just return the error. */ | |
910 | ssif_inc_stat(ssif_info, send_errors); | |
911 | ||
912 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
913 | pr_info("Error from i2c_non_blocking_op(3)\n"); | |
914 | msg_done_handler(ssif_info, -EIO, NULL, 0); | |
915 | } | |
916 | } else { | |
91620521 CM |
917 | unsigned long oflags, *flags; |
918 | bool got_alert; | |
919 | ||
25930707 CM |
920 | ssif_inc_stat(ssif_info, sent_messages); |
921 | ssif_inc_stat(ssif_info, sent_messages_parts); | |
922 | ||
91620521 CM |
923 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
924 | got_alert = ssif_info->got_alert; | |
925 | if (got_alert) { | |
926 | ssif_info->got_alert = false; | |
927 | ssif_info->waiting_alert = false; | |
928 | } | |
929 | ||
930 | if (got_alert) { | |
931 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
932 | /* The alert already happened, try now. */ | |
933 | retry_timeout((unsigned long) ssif_info); | |
934 | } else { | |
935 | /* Wait a jiffie then request the next message */ | |
936 | ssif_info->waiting_alert = true; | |
937 | ssif_info->retries_left = SSIF_RECV_RETRIES; | |
938 | ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC; | |
939 | mod_timer(&ssif_info->retry_timer, | |
940 | jiffies + SSIF_MSG_PART_JIFFIES); | |
941 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
942 | } | |
25930707 CM |
943 | } |
944 | } | |
945 | ||
946 | static int start_resend(struct ssif_info *ssif_info) | |
947 | { | |
948 | int rv; | |
949 | int command; | |
950 | ||
91620521 CM |
951 | ssif_info->got_alert = false; |
952 | ||
25930707 CM |
953 | if (ssif_info->data_len > 32) { |
954 | command = SSIF_IPMI_MULTI_PART_REQUEST_START; | |
955 | ssif_info->multi_data = ssif_info->data; | |
956 | ssif_info->multi_len = ssif_info->data_len; | |
957 | /* | |
958 | * Subtle thing, this is 32, not 33, because we will | |
959 | * overwrite the thing at position 32 (which was just | |
960 | * transmitted) with the new length. | |
961 | */ | |
962 | ssif_info->multi_pos = 32; | |
963 | ssif_info->data[0] = 32; | |
964 | } else { | |
965 | ssif_info->multi_data = NULL; | |
966 | command = SSIF_IPMI_REQUEST; | |
967 | ssif_info->data[0] = ssif_info->data_len; | |
968 | } | |
969 | ||
970 | rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE, | |
971 | command, ssif_info->data, I2C_SMBUS_BLOCK_DATA); | |
972 | if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG)) | |
973 | pr_info("Error from i2c_non_blocking_op(4)\n"); | |
974 | return rv; | |
975 | } | |
976 | ||
977 | static int start_send(struct ssif_info *ssif_info, | |
978 | unsigned char *data, | |
979 | unsigned int len) | |
980 | { | |
981 | if (len > IPMI_MAX_MSG_LENGTH) | |
982 | return -E2BIG; | |
983 | if (len > ssif_info->max_xmit_msg_size) | |
984 | return -E2BIG; | |
985 | ||
986 | ssif_info->retries_left = SSIF_SEND_RETRIES; | |
987 | memcpy(ssif_info->data+1, data, len); | |
988 | ssif_info->data_len = len; | |
989 | return start_resend(ssif_info); | |
990 | } | |
991 | ||
992 | /* Must be called with the message lock held. */ | |
993 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags) | |
994 | { | |
995 | struct ipmi_smi_msg *msg; | |
996 | unsigned long oflags; | |
997 | ||
998 | restart: | |
999 | if (!SSIF_IDLE(ssif_info)) { | |
1000 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1001 | return; | |
1002 | } | |
1003 | ||
1004 | if (!ssif_info->waiting_msg) { | |
1005 | ssif_info->curr_msg = NULL; | |
1006 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1007 | } else { | |
1008 | int rv; | |
1009 | ||
1010 | ssif_info->curr_msg = ssif_info->waiting_msg; | |
1011 | ssif_info->waiting_msg = NULL; | |
1012 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1013 | rv = start_send(ssif_info, | |
1014 | ssif_info->curr_msg->data, | |
1015 | ssif_info->curr_msg->data_size); | |
1016 | if (rv) { | |
1017 | msg = ssif_info->curr_msg; | |
1018 | ssif_info->curr_msg = NULL; | |
1019 | return_hosed_msg(ssif_info, msg); | |
1020 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1021 | goto restart; | |
1022 | } | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | static void sender(void *send_info, | |
1027 | struct ipmi_smi_msg *msg) | |
1028 | { | |
1029 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
1030 | unsigned long oflags, *flags; | |
1031 | ||
1032 | BUG_ON(ssif_info->waiting_msg); | |
1033 | ssif_info->waiting_msg = msg; | |
1034 | ||
1035 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1036 | start_next_msg(ssif_info, flags); | |
1037 | ||
1038 | if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) { | |
1039 | struct timeval t; | |
1040 | ||
1041 | do_gettimeofday(&t); | |
1042 | pr_info("**Enqueue %02x %02x: %ld.%6.6ld\n", | |
1421c935 CM |
1043 | msg->data[0], msg->data[1], |
1044 | (long) t.tv_sec, (long) t.tv_usec); | |
25930707 CM |
1045 | } |
1046 | } | |
1047 | ||
1048 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) | |
1049 | { | |
1050 | struct ssif_info *ssif_info = send_info; | |
1051 | ||
1052 | data->addr_src = ssif_info->addr_source; | |
1053 | data->dev = &ssif_info->client->dev; | |
1054 | data->addr_info = ssif_info->addr_info; | |
1055 | get_device(data->dev); | |
1056 | ||
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * Instead of having our own timer to periodically check the message | |
1062 | * flags, we let the message handler drive us. | |
1063 | */ | |
1064 | static void request_events(void *send_info) | |
1065 | { | |
1066 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
1067 | unsigned long oflags, *flags; | |
1068 | ||
1069 | if (!ssif_info->has_event_buffer) | |
1070 | return; | |
1071 | ||
1072 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1073 | /* | |
1074 | * Request flags first, not events, because the lower layer | |
1075 | * doesn't have a way to send an attention. But make sure | |
1076 | * event checking still happens. | |
1077 | */ | |
1078 | ssif_info->req_events = true; | |
1079 | if (SSIF_IDLE(ssif_info)) | |
1080 | start_flag_fetch(ssif_info, flags); | |
1081 | else { | |
1082 | ssif_info->req_flags = true; | |
1083 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | static int inc_usecount(void *send_info) | |
1088 | { | |
1089 | struct ssif_info *ssif_info = send_info; | |
1090 | ||
1091 | if (!i2c_get_adapter(ssif_info->client->adapter->nr)) | |
1092 | return -ENODEV; | |
1093 | ||
1094 | i2c_use_client(ssif_info->client); | |
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | static void dec_usecount(void *send_info) | |
1099 | { | |
1100 | struct ssif_info *ssif_info = send_info; | |
1101 | ||
1102 | i2c_release_client(ssif_info->client); | |
1103 | i2c_put_adapter(ssif_info->client->adapter); | |
1104 | } | |
1105 | ||
1106 | static int ssif_start_processing(void *send_info, | |
1107 | ipmi_smi_t intf) | |
1108 | { | |
1109 | struct ssif_info *ssif_info = send_info; | |
1110 | ||
1111 | ssif_info->intf = intf; | |
1112 | ||
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | #define MAX_SSIF_BMCS 4 | |
1117 | ||
1118 | static unsigned short addr[MAX_SSIF_BMCS]; | |
1119 | static int num_addrs; | |
1120 | module_param_array(addr, ushort, &num_addrs, 0); | |
1121 | MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs."); | |
1122 | ||
1123 | static char *adapter_name[MAX_SSIF_BMCS]; | |
1124 | static int num_adapter_names; | |
1125 | module_param_array(adapter_name, charp, &num_adapter_names, 0); | |
1126 | MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned."); | |
1127 | ||
1128 | static int slave_addrs[MAX_SSIF_BMCS]; | |
1129 | static int num_slave_addrs; | |
1130 | module_param_array(slave_addrs, int, &num_slave_addrs, 0); | |
1131 | MODULE_PARM_DESC(slave_addrs, | |
1132 | "The default IPMB slave address for the controller."); | |
1133 | ||
1134 | /* | |
1135 | * Bit 0 enables message debugging, bit 1 enables state debugging, and | |
1136 | * bit 2 enables timing debugging. This is an array indexed by | |
1137 | * interface number" | |
1138 | */ | |
1139 | static int dbg[MAX_SSIF_BMCS]; | |
1140 | static int num_dbg; | |
1141 | module_param_array(dbg, int, &num_dbg, 0); | |
1142 | MODULE_PARM_DESC(dbg, "Turn on debugging."); | |
1143 | ||
1144 | static bool ssif_dbg_probe; | |
1145 | module_param_named(dbg_probe, ssif_dbg_probe, bool, 0); | |
1146 | MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters."); | |
1147 | ||
1148 | static int use_thread; | |
1149 | module_param(use_thread, int, 0); | |
1150 | MODULE_PARM_DESC(use_thread, "Use the thread interface."); | |
1151 | ||
1152 | static bool ssif_tryacpi = 1; | |
1153 | module_param_named(tryacpi, ssif_tryacpi, bool, 0); | |
1154 | MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI"); | |
1155 | ||
1156 | static bool ssif_trydmi = 1; | |
1157 | module_param_named(trydmi, ssif_trydmi, bool, 0); | |
1158 | MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)"); | |
1159 | ||
1160 | static DEFINE_MUTEX(ssif_infos_mutex); | |
1161 | static LIST_HEAD(ssif_infos); | |
1162 | ||
1163 | static int ssif_remove(struct i2c_client *client) | |
1164 | { | |
1165 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
1166 | int rv; | |
1167 | ||
1168 | if (!ssif_info) | |
1169 | return 0; | |
1170 | ||
25930707 CM |
1171 | /* |
1172 | * After this point, we won't deliver anything asychronously | |
1173 | * to the message handler. We can unregister ourself. | |
1174 | */ | |
1175 | rv = ipmi_unregister_smi(ssif_info->intf); | |
1176 | if (rv) { | |
1177 | pr_err(PFX "Unable to unregister device: errno=%d\n", rv); | |
1178 | return rv; | |
1179 | } | |
1180 | ssif_info->intf = NULL; | |
1181 | ||
1182 | /* make sure the driver is not looking for flags any more. */ | |
1183 | while (ssif_info->ssif_state != SSIF_NORMAL) | |
1184 | schedule_timeout(1); | |
1185 | ||
1186 | ssif_info->stopping = true; | |
1187 | del_timer_sync(&ssif_info->retry_timer); | |
1188 | if (ssif_info->thread) { | |
1189 | complete(&ssif_info->wake_thread); | |
1190 | kthread_stop(ssif_info->thread); | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * No message can be outstanding now, we have removed the | |
1195 | * upper layer and it permitted us to do so. | |
1196 | */ | |
1197 | kfree(ssif_info); | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | static int do_cmd(struct i2c_client *client, int len, unsigned char *msg, | |
1202 | int *resp_len, unsigned char *resp) | |
1203 | { | |
1204 | int retry_cnt; | |
1205 | int ret; | |
1206 | ||
1207 | retry_cnt = SSIF_SEND_RETRIES; | |
1208 | retry1: | |
1209 | ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg); | |
1210 | if (ret) { | |
1211 | retry_cnt--; | |
1212 | if (retry_cnt > 0) | |
1213 | goto retry1; | |
1214 | return -ENODEV; | |
1215 | } | |
1216 | ||
1217 | ret = -ENODEV; | |
1218 | retry_cnt = SSIF_RECV_RETRIES; | |
1219 | while (retry_cnt > 0) { | |
1220 | ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE, | |
1221 | resp); | |
1222 | if (ret > 0) | |
1223 | break; | |
1224 | msleep(SSIF_MSG_MSEC); | |
1225 | retry_cnt--; | |
1226 | if (retry_cnt <= 0) | |
1227 | break; | |
1228 | } | |
1229 | ||
1230 | if (ret > 0) { | |
1231 | /* Validate that the response is correct. */ | |
1232 | if (ret < 3 || | |
1233 | (resp[0] != (msg[0] | (1 << 2))) || | |
1234 | (resp[1] != msg[1])) | |
1235 | ret = -EINVAL; | |
1236 | else { | |
1237 | *resp_len = ret; | |
1238 | ret = 0; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | return ret; | |
1243 | } | |
1244 | ||
1245 | static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info) | |
1246 | { | |
1247 | unsigned char *resp; | |
1248 | unsigned char msg[3]; | |
1249 | int rv; | |
1250 | int len; | |
1251 | ||
1252 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1253 | if (!resp) | |
1254 | return -ENOMEM; | |
1255 | ||
1256 | /* Do a Get Device ID command, since it is required. */ | |
1257 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1258 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1259 | rv = do_cmd(client, 2, msg, &len, resp); | |
1260 | if (rv) | |
1261 | rv = -ENODEV; | |
1262 | else | |
1263 | strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE); | |
1264 | kfree(resp); | |
1265 | return rv; | |
1266 | } | |
1267 | ||
1268 | static int smi_type_proc_show(struct seq_file *m, void *v) | |
1269 | { | |
d6c5dc18 JP |
1270 | seq_puts(m, "ssif\n"); |
1271 | ||
5e33cd0c | 1272 | return 0; |
25930707 CM |
1273 | } |
1274 | ||
1275 | static int smi_type_proc_open(struct inode *inode, struct file *file) | |
1276 | { | |
1277 | return single_open(file, smi_type_proc_show, inode->i_private); | |
1278 | } | |
1279 | ||
1280 | static const struct file_operations smi_type_proc_ops = { | |
1281 | .open = smi_type_proc_open, | |
1282 | .read = seq_read, | |
1283 | .llseek = seq_lseek, | |
1284 | .release = single_release, | |
1285 | }; | |
1286 | ||
1287 | static int smi_stats_proc_show(struct seq_file *m, void *v) | |
1288 | { | |
1289 | struct ssif_info *ssif_info = m->private; | |
1290 | ||
1291 | seq_printf(m, "sent_messages: %u\n", | |
1292 | ssif_get_stat(ssif_info, sent_messages)); | |
1293 | seq_printf(m, "sent_messages_parts: %u\n", | |
1294 | ssif_get_stat(ssif_info, sent_messages_parts)); | |
1295 | seq_printf(m, "send_retries: %u\n", | |
1296 | ssif_get_stat(ssif_info, send_retries)); | |
1297 | seq_printf(m, "send_errors: %u\n", | |
1298 | ssif_get_stat(ssif_info, send_errors)); | |
1299 | seq_printf(m, "received_messages: %u\n", | |
1300 | ssif_get_stat(ssif_info, received_messages)); | |
1301 | seq_printf(m, "received_message_parts: %u\n", | |
1302 | ssif_get_stat(ssif_info, received_message_parts)); | |
1303 | seq_printf(m, "receive_retries: %u\n", | |
1304 | ssif_get_stat(ssif_info, receive_retries)); | |
1305 | seq_printf(m, "receive_errors: %u\n", | |
1306 | ssif_get_stat(ssif_info, receive_errors)); | |
1307 | seq_printf(m, "flag_fetches: %u\n", | |
1308 | ssif_get_stat(ssif_info, flag_fetches)); | |
1309 | seq_printf(m, "hosed: %u\n", | |
1310 | ssif_get_stat(ssif_info, hosed)); | |
1311 | seq_printf(m, "events: %u\n", | |
1312 | ssif_get_stat(ssif_info, events)); | |
1313 | seq_printf(m, "watchdog_pretimeouts: %u\n", | |
1314 | ssif_get_stat(ssif_info, watchdog_pretimeouts)); | |
91620521 CM |
1315 | seq_printf(m, "alerts: %u\n", |
1316 | ssif_get_stat(ssif_info, alerts)); | |
25930707 CM |
1317 | return 0; |
1318 | } | |
1319 | ||
1320 | static int smi_stats_proc_open(struct inode *inode, struct file *file) | |
1321 | { | |
1322 | return single_open(file, smi_stats_proc_show, PDE_DATA(inode)); | |
1323 | } | |
1324 | ||
1325 | static const struct file_operations smi_stats_proc_ops = { | |
1326 | .open = smi_stats_proc_open, | |
1327 | .read = seq_read, | |
1328 | .llseek = seq_lseek, | |
1329 | .release = single_release, | |
1330 | }; | |
1331 | ||
b0e9aaa9 CM |
1332 | static int strcmp_nospace(char *s1, char *s2) |
1333 | { | |
1334 | while (*s1 && *s2) { | |
1335 | while (isspace(*s1)) | |
1336 | s1++; | |
1337 | while (isspace(*s2)) | |
1338 | s2++; | |
1339 | if (*s1 > *s2) | |
1340 | return 1; | |
1341 | if (*s1 < *s2) | |
1342 | return -1; | |
1343 | s1++; | |
1344 | s2++; | |
1345 | } | |
1346 | return 0; | |
1347 | } | |
1348 | ||
25930707 CM |
1349 | static struct ssif_addr_info *ssif_info_find(unsigned short addr, |
1350 | char *adapter_name, | |
1351 | bool match_null_name) | |
1352 | { | |
1353 | struct ssif_addr_info *info, *found = NULL; | |
1354 | ||
1355 | restart: | |
1356 | list_for_each_entry(info, &ssif_infos, link) { | |
1357 | if (info->binfo.addr == addr) { | |
1358 | if (info->adapter_name || adapter_name) { | |
1359 | if (!info->adapter_name != !adapter_name) { | |
1360 | /* One is NULL and one is not */ | |
1361 | continue; | |
1362 | } | |
b0e9aaa9 CM |
1363 | if (adapter_name && |
1364 | strcmp_nospace(info->adapter_name, | |
1365 | adapter_name)) | |
1366 | /* Names do not match */ | |
25930707 CM |
1367 | continue; |
1368 | } | |
1369 | found = info; | |
1370 | break; | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | if (!found && match_null_name) { | |
1375 | /* Try to get an exact match first, then try with a NULL name */ | |
1376 | adapter_name = NULL; | |
1377 | match_null_name = false; | |
1378 | goto restart; | |
1379 | } | |
1380 | ||
1381 | return found; | |
1382 | } | |
1383 | ||
1384 | static bool check_acpi(struct ssif_info *ssif_info, struct device *dev) | |
1385 | { | |
1386 | #ifdef CONFIG_ACPI | |
1387 | acpi_handle acpi_handle; | |
1388 | ||
1389 | acpi_handle = ACPI_HANDLE(dev); | |
1390 | if (acpi_handle) { | |
1391 | ssif_info->addr_source = SI_ACPI; | |
1392 | ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle; | |
1393 | return true; | |
1394 | } | |
1395 | #endif | |
1396 | return false; | |
1397 | } | |
1398 | ||
91620521 CM |
1399 | /* |
1400 | * Global enables we care about. | |
1401 | */ | |
1402 | #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ | |
1403 | IPMI_BMC_EVT_MSG_INTR) | |
1404 | ||
25930707 CM |
1405 | static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id) |
1406 | { | |
1407 | unsigned char msg[3]; | |
1408 | unsigned char *resp; | |
1409 | struct ssif_info *ssif_info; | |
1410 | int rv = 0; | |
1411 | int len; | |
1412 | int i; | |
1413 | u8 slave_addr = 0; | |
1414 | struct ssif_addr_info *addr_info = NULL; | |
1415 | ||
1416 | ||
1417 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1418 | if (!resp) | |
1419 | return -ENOMEM; | |
1420 | ||
1421 | ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL); | |
1422 | if (!ssif_info) { | |
1423 | kfree(resp); | |
1424 | return -ENOMEM; | |
1425 | } | |
1426 | ||
1427 | if (!check_acpi(ssif_info, &client->dev)) { | |
1428 | addr_info = ssif_info_find(client->addr, client->adapter->name, | |
1429 | true); | |
1430 | if (!addr_info) { | |
1431 | /* Must have come in through sysfs. */ | |
1432 | ssif_info->addr_source = SI_HOTMOD; | |
1433 | } else { | |
1434 | ssif_info->addr_source = addr_info->addr_src; | |
1435 | ssif_info->ssif_debug = addr_info->debug; | |
1436 | ssif_info->addr_info = addr_info->addr_info; | |
1437 | slave_addr = addr_info->slave_addr; | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | pr_info(PFX "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n", | |
1442 | ipmi_addr_src_to_str(ssif_info->addr_source), | |
1443 | client->addr, client->adapter->name, slave_addr); | |
1444 | ||
1445 | /* | |
1446 | * Do a Get Device ID command, since it comes back with some | |
1447 | * useful info. | |
1448 | */ | |
1449 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1450 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1451 | rv = do_cmd(client, 2, msg, &len, resp); | |
1452 | if (rv) | |
1453 | goto out; | |
1454 | ||
1455 | rv = ipmi_demangle_device_id(resp, len, &ssif_info->device_id); | |
1456 | if (rv) | |
1457 | goto out; | |
1458 | ||
1459 | ssif_info->client = client; | |
1460 | i2c_set_clientdata(client, ssif_info); | |
1461 | ||
1462 | /* Now check for system interface capabilities */ | |
1463 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1464 | msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD; | |
1465 | msg[2] = 0; /* SSIF */ | |
1466 | rv = do_cmd(client, 3, msg, &len, resp); | |
1467 | if (!rv && (len >= 3) && (resp[2] == 0)) { | |
1468 | if (len < 7) { | |
1469 | if (ssif_dbg_probe) | |
1470 | pr_info(PFX "SSIF info too short: %d\n", len); | |
1471 | goto no_support; | |
1472 | } | |
1473 | ||
1474 | /* Got a good SSIF response, handle it. */ | |
1475 | ssif_info->max_xmit_msg_size = resp[5]; | |
1476 | ssif_info->max_recv_msg_size = resp[6]; | |
1477 | ssif_info->multi_support = (resp[4] >> 6) & 0x3; | |
1478 | ssif_info->supports_pec = (resp[4] >> 3) & 0x1; | |
1479 | ||
1480 | /* Sanitize the data */ | |
1481 | switch (ssif_info->multi_support) { | |
1482 | case SSIF_NO_MULTI: | |
1483 | if (ssif_info->max_xmit_msg_size > 32) | |
1484 | ssif_info->max_xmit_msg_size = 32; | |
1485 | if (ssif_info->max_recv_msg_size > 32) | |
1486 | ssif_info->max_recv_msg_size = 32; | |
1487 | break; | |
1488 | ||
1489 | case SSIF_MULTI_2_PART: | |
1490 | if (ssif_info->max_xmit_msg_size > 64) | |
1491 | ssif_info->max_xmit_msg_size = 64; | |
1492 | if (ssif_info->max_recv_msg_size > 62) | |
1493 | ssif_info->max_recv_msg_size = 62; | |
1494 | break; | |
1495 | ||
1496 | case SSIF_MULTI_n_PART: | |
1497 | break; | |
1498 | ||
1499 | default: | |
1500 | /* Data is not sane, just give up. */ | |
1501 | goto no_support; | |
1502 | } | |
1503 | } else { | |
1504 | no_support: | |
1505 | /* Assume no multi-part or PEC support */ | |
b0e9aaa9 | 1506 | pr_info(PFX "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n", |
25930707 CM |
1507 | rv, len, resp[2]); |
1508 | ||
1509 | ssif_info->max_xmit_msg_size = 32; | |
1510 | ssif_info->max_recv_msg_size = 32; | |
1511 | ssif_info->multi_support = SSIF_NO_MULTI; | |
1512 | ssif_info->supports_pec = 0; | |
1513 | } | |
1514 | ||
1515 | /* Make sure the NMI timeout is cleared. */ | |
1516 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1517 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
1518 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
1519 | rv = do_cmd(client, 3, msg, &len, resp); | |
1520 | if (rv || (len < 3) || (resp[2] != 0)) | |
1521 | pr_warn(PFX "Unable to clear message flags: %d %d %2.2x\n", | |
1522 | rv, len, resp[2]); | |
1523 | ||
1524 | /* Attempt to enable the event buffer. */ | |
1525 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1526 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1527 | rv = do_cmd(client, 2, msg, &len, resp); | |
1528 | if (rv || (len < 4) || (resp[2] != 0)) { | |
1529 | pr_warn(PFX "Error getting global enables: %d %d %2.2x\n", | |
1530 | rv, len, resp[2]); | |
1531 | rv = 0; /* Not fatal */ | |
1532 | goto found; | |
1533 | } | |
1534 | ||
91620521 CM |
1535 | ssif_info->global_enables = resp[3]; |
1536 | ||
25930707 CM |
1537 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
1538 | ssif_info->has_event_buffer = true; | |
1539 | /* buffer is already enabled, nothing to do. */ | |
1540 | goto found; | |
1541 | } | |
1542 | ||
1543 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1544 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
91620521 | 1545 | msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF; |
25930707 CM |
1546 | rv = do_cmd(client, 3, msg, &len, resp); |
1547 | if (rv || (len < 2)) { | |
91620521 | 1548 | pr_warn(PFX "Error setting global enables: %d %d %2.2x\n", |
25930707 CM |
1549 | rv, len, resp[2]); |
1550 | rv = 0; /* Not fatal */ | |
1551 | goto found; | |
1552 | } | |
1553 | ||
91620521 | 1554 | if (resp[2] == 0) { |
25930707 CM |
1555 | /* A successful return means the event buffer is supported. */ |
1556 | ssif_info->has_event_buffer = true; | |
91620521 CM |
1557 | ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF; |
1558 | } | |
1559 | ||
1560 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1561 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1562 | msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR; | |
1563 | rv = do_cmd(client, 3, msg, &len, resp); | |
1564 | if (rv || (len < 2)) { | |
1565 | pr_warn(PFX "Error setting global enables: %d %d %2.2x\n", | |
1566 | rv, len, resp[2]); | |
1567 | rv = 0; /* Not fatal */ | |
1568 | goto found; | |
1569 | } | |
1570 | ||
1571 | if (resp[2] == 0) { | |
1572 | /* A successful return means the alert is supported. */ | |
1573 | ssif_info->supports_alert = true; | |
1574 | ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR; | |
1575 | } | |
25930707 CM |
1576 | |
1577 | found: | |
1578 | ssif_info->intf_num = atomic_inc_return(&next_intf); | |
1579 | ||
1580 | if (ssif_dbg_probe) { | |
1581 | pr_info("ssif_probe: i2c_probe found device at i2c address %x\n", | |
1582 | client->addr); | |
1583 | } | |
1584 | ||
1585 | spin_lock_init(&ssif_info->lock); | |
1586 | ssif_info->ssif_state = SSIF_NORMAL; | |
1587 | init_timer(&ssif_info->retry_timer); | |
1588 | ssif_info->retry_timer.data = (unsigned long) ssif_info; | |
1589 | ssif_info->retry_timer.function = retry_timeout; | |
1590 | ||
1591 | for (i = 0; i < SSIF_NUM_STATS; i++) | |
1592 | atomic_set(&ssif_info->stats[i], 0); | |
1593 | ||
1594 | if (ssif_info->supports_pec) | |
1595 | ssif_info->client->flags |= I2C_CLIENT_PEC; | |
1596 | ||
1597 | ssif_info->handlers.owner = THIS_MODULE; | |
1598 | ssif_info->handlers.start_processing = ssif_start_processing; | |
1599 | ssif_info->handlers.get_smi_info = get_smi_info; | |
1600 | ssif_info->handlers.sender = sender; | |
1601 | ssif_info->handlers.request_events = request_events; | |
1602 | ssif_info->handlers.inc_usecount = inc_usecount; | |
1603 | ssif_info->handlers.dec_usecount = dec_usecount; | |
1604 | ||
1605 | { | |
1606 | unsigned int thread_num; | |
1607 | ||
1608 | thread_num = ((ssif_info->client->adapter->nr << 8) | | |
1609 | ssif_info->client->addr); | |
1610 | init_completion(&ssif_info->wake_thread); | |
1611 | ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info, | |
1612 | "kssif%4.4x", thread_num); | |
1613 | if (IS_ERR(ssif_info->thread)) { | |
1614 | rv = PTR_ERR(ssif_info->thread); | |
1615 | dev_notice(&ssif_info->client->dev, | |
1616 | "Could not start kernel thread: error %d\n", | |
1617 | rv); | |
1618 | goto out; | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | rv = ipmi_register_smi(&ssif_info->handlers, | |
1623 | ssif_info, | |
1624 | &ssif_info->device_id, | |
1625 | &ssif_info->client->dev, | |
1626 | slave_addr); | |
1627 | if (rv) { | |
1628 | pr_err(PFX "Unable to register device: error %d\n", rv); | |
1629 | goto out; | |
1630 | } | |
1631 | ||
1632 | rv = ipmi_smi_add_proc_entry(ssif_info->intf, "type", | |
1633 | &smi_type_proc_ops, | |
1634 | ssif_info); | |
1635 | if (rv) { | |
1636 | pr_err(PFX "Unable to create proc entry: %d\n", rv); | |
1637 | goto out_err_unreg; | |
1638 | } | |
1639 | ||
1640 | rv = ipmi_smi_add_proc_entry(ssif_info->intf, "ssif_stats", | |
1641 | &smi_stats_proc_ops, | |
1642 | ssif_info); | |
1643 | if (rv) { | |
1644 | pr_err(PFX "Unable to create proc entry: %d\n", rv); | |
1645 | goto out_err_unreg; | |
1646 | } | |
1647 | ||
1648 | out: | |
1649 | if (rv) | |
1650 | kfree(ssif_info); | |
1651 | kfree(resp); | |
1652 | return rv; | |
1653 | ||
1654 | out_err_unreg: | |
1655 | ipmi_unregister_smi(ssif_info->intf); | |
1656 | goto out; | |
1657 | } | |
1658 | ||
1659 | static int ssif_adapter_handler(struct device *adev, void *opaque) | |
1660 | { | |
1661 | struct ssif_addr_info *addr_info = opaque; | |
1662 | ||
1663 | if (adev->type != &i2c_adapter_type) | |
1664 | return 0; | |
1665 | ||
1666 | i2c_new_device(to_i2c_adapter(adev), &addr_info->binfo); | |
1667 | ||
1668 | if (!addr_info->adapter_name) | |
1669 | return 1; /* Only try the first I2C adapter by default. */ | |
1670 | return 0; | |
1671 | } | |
1672 | ||
1673 | static int new_ssif_client(int addr, char *adapter_name, | |
1674 | int debug, int slave_addr, | |
1675 | enum ipmi_addr_src addr_src) | |
1676 | { | |
1677 | struct ssif_addr_info *addr_info; | |
1678 | int rv = 0; | |
1679 | ||
1680 | mutex_lock(&ssif_infos_mutex); | |
1681 | if (ssif_info_find(addr, adapter_name, false)) { | |
1682 | rv = -EEXIST; | |
1683 | goto out_unlock; | |
1684 | } | |
1685 | ||
1686 | addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL); | |
1687 | if (!addr_info) { | |
1688 | rv = -ENOMEM; | |
1689 | goto out_unlock; | |
1690 | } | |
1691 | ||
1692 | if (adapter_name) { | |
1693 | addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL); | |
1694 | if (!addr_info->adapter_name) { | |
1695 | kfree(addr_info); | |
1696 | rv = -ENOMEM; | |
1697 | goto out_unlock; | |
1698 | } | |
1699 | } | |
1700 | ||
1701 | strncpy(addr_info->binfo.type, DEVICE_NAME, | |
1702 | sizeof(addr_info->binfo.type)); | |
1703 | addr_info->binfo.addr = addr; | |
1704 | addr_info->binfo.platform_data = addr_info; | |
1705 | addr_info->debug = debug; | |
1706 | addr_info->slave_addr = slave_addr; | |
1707 | addr_info->addr_src = addr_src; | |
1708 | ||
1709 | list_add_tail(&addr_info->link, &ssif_infos); | |
1710 | ||
1711 | if (initialized) | |
1712 | i2c_for_each_dev(addr_info, ssif_adapter_handler); | |
1713 | /* Otherwise address list will get it */ | |
1714 | ||
1715 | out_unlock: | |
1716 | mutex_unlock(&ssif_infos_mutex); | |
1717 | return rv; | |
1718 | } | |
1719 | ||
1720 | static void free_ssif_clients(void) | |
1721 | { | |
1722 | struct ssif_addr_info *info, *tmp; | |
1723 | ||
1724 | mutex_lock(&ssif_infos_mutex); | |
1725 | list_for_each_entry_safe(info, tmp, &ssif_infos, link) { | |
1726 | list_del(&info->link); | |
1727 | kfree(info->adapter_name); | |
1728 | kfree(info); | |
1729 | } | |
1730 | mutex_unlock(&ssif_infos_mutex); | |
1731 | } | |
1732 | ||
1733 | static unsigned short *ssif_address_list(void) | |
1734 | { | |
1735 | struct ssif_addr_info *info; | |
1736 | unsigned int count = 0, i; | |
1737 | unsigned short *address_list; | |
1738 | ||
1739 | list_for_each_entry(info, &ssif_infos, link) | |
1740 | count++; | |
1741 | ||
1742 | address_list = kzalloc(sizeof(*address_list) * (count + 1), GFP_KERNEL); | |
1743 | if (!address_list) | |
1744 | return NULL; | |
1745 | ||
1746 | i = 0; | |
1747 | list_for_each_entry(info, &ssif_infos, link) { | |
1748 | unsigned short addr = info->binfo.addr; | |
1749 | int j; | |
1750 | ||
1751 | for (j = 0; j < i; j++) { | |
1752 | if (address_list[j] == addr) | |
1753 | goto skip_addr; | |
1754 | } | |
1755 | address_list[i] = addr; | |
1756 | skip_addr: | |
1757 | i++; | |
1758 | } | |
1759 | address_list[i] = I2C_CLIENT_END; | |
1760 | ||
1761 | return address_list; | |
1762 | } | |
1763 | ||
1764 | #ifdef CONFIG_ACPI | |
1765 | static struct acpi_device_id ssif_acpi_match[] = { | |
1766 | { "IPI0001", 0 }, | |
1767 | { }, | |
1768 | }; | |
1769 | MODULE_DEVICE_TABLE(acpi, ssif_acpi_match); | |
1770 | ||
1771 | /* | |
1772 | * Once we get an ACPI failure, we don't try any more, because we go | |
1773 | * through the tables sequentially. Once we don't find a table, there | |
1774 | * are no more. | |
1775 | */ | |
1776 | static int acpi_failure; | |
1777 | ||
1778 | /* | |
1779 | * Defined in the IPMI 2.0 spec. | |
1780 | */ | |
1781 | struct SPMITable { | |
1782 | s8 Signature[4]; | |
1783 | u32 Length; | |
1784 | u8 Revision; | |
1785 | u8 Checksum; | |
1786 | s8 OEMID[6]; | |
1787 | s8 OEMTableID[8]; | |
1788 | s8 OEMRevision[4]; | |
1789 | s8 CreatorID[4]; | |
1790 | s8 CreatorRevision[4]; | |
1791 | u8 InterfaceType; | |
1792 | u8 IPMIlegacy; | |
1793 | s16 SpecificationRevision; | |
1794 | ||
1795 | /* | |
1796 | * Bit 0 - SCI interrupt supported | |
1797 | * Bit 1 - I/O APIC/SAPIC | |
1798 | */ | |
1799 | u8 InterruptType; | |
1800 | ||
1801 | /* | |
1802 | * If bit 0 of InterruptType is set, then this is the SCI | |
1803 | * interrupt in the GPEx_STS register. | |
1804 | */ | |
1805 | u8 GPE; | |
1806 | ||
1807 | s16 Reserved; | |
1808 | ||
1809 | /* | |
1810 | * If bit 1 of InterruptType is set, then this is the I/O | |
1811 | * APIC/SAPIC interrupt. | |
1812 | */ | |
1813 | u32 GlobalSystemInterrupt; | |
1814 | ||
1815 | /* The actual register address. */ | |
1816 | struct acpi_generic_address addr; | |
1817 | ||
1818 | u8 UID[4]; | |
1819 | ||
1820 | s8 spmi_id[1]; /* A '\0' terminated array starts here. */ | |
1821 | }; | |
1822 | ||
1823 | static int try_init_spmi(struct SPMITable *spmi) | |
1824 | { | |
1825 | unsigned short myaddr; | |
1826 | ||
1827 | if (num_addrs >= MAX_SSIF_BMCS) | |
1828 | return -1; | |
1829 | ||
1830 | if (spmi->IPMIlegacy != 1) { | |
1831 | pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy); | |
1832 | return -ENODEV; | |
1833 | } | |
1834 | ||
1835 | if (spmi->InterfaceType != 4) | |
1836 | return -ENODEV; | |
1837 | ||
1838 | if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) { | |
1839 | pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n", | |
1840 | spmi->addr.space_id); | |
1841 | return -EIO; | |
1842 | } | |
1843 | ||
1844 | myaddr = spmi->addr.address >> 1; | |
1845 | ||
1846 | return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI); | |
1847 | } | |
1848 | ||
1849 | static void spmi_find_bmc(void) | |
1850 | { | |
1851 | acpi_status status; | |
1852 | struct SPMITable *spmi; | |
1853 | int i; | |
1854 | ||
1855 | if (acpi_disabled) | |
1856 | return; | |
1857 | ||
1858 | if (acpi_failure) | |
1859 | return; | |
1860 | ||
1861 | for (i = 0; ; i++) { | |
1862 | status = acpi_get_table(ACPI_SIG_SPMI, i+1, | |
1863 | (struct acpi_table_header **)&spmi); | |
1864 | if (status != AE_OK) | |
1865 | return; | |
1866 | ||
1867 | try_init_spmi(spmi); | |
1868 | } | |
1869 | } | |
1870 | #else | |
1871 | static void spmi_find_bmc(void) { } | |
1872 | #endif | |
1873 | ||
1874 | #ifdef CONFIG_DMI | |
1875 | static int decode_dmi(const struct dmi_device *dmi_dev) | |
1876 | { | |
1877 | struct dmi_header *dm = dmi_dev->device_data; | |
1878 | u8 *data = (u8 *) dm; | |
1879 | u8 len = dm->length; | |
1880 | unsigned short myaddr; | |
1881 | int slave_addr; | |
1882 | ||
1883 | if (num_addrs >= MAX_SSIF_BMCS) | |
1884 | return -1; | |
1885 | ||
1886 | if (len < 9) | |
1887 | return -1; | |
1888 | ||
1889 | if (data[0x04] != 4) /* Not SSIF */ | |
1890 | return -1; | |
1891 | ||
1892 | if ((data[8] >> 1) == 0) { | |
1893 | /* | |
1894 | * Some broken systems put the I2C address in | |
1895 | * the slave address field. We try to | |
1896 | * accommodate them here. | |
1897 | */ | |
1898 | myaddr = data[6] >> 1; | |
1899 | slave_addr = 0; | |
1900 | } else { | |
1901 | myaddr = data[8] >> 1; | |
1902 | slave_addr = data[6]; | |
1903 | } | |
1904 | ||
1905 | return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS); | |
1906 | } | |
1907 | ||
1908 | static void dmi_iterator(void) | |
1909 | { | |
1910 | const struct dmi_device *dev = NULL; | |
1911 | ||
1912 | while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) | |
1913 | decode_dmi(dev); | |
1914 | } | |
1915 | #else | |
1916 | static void dmi_iterator(void) { } | |
1917 | #endif | |
1918 | ||
1919 | static const struct i2c_device_id ssif_id[] = { | |
1920 | { DEVICE_NAME, 0 }, | |
1921 | { } | |
1922 | }; | |
1923 | MODULE_DEVICE_TABLE(i2c, ssif_id); | |
1924 | ||
1925 | static struct i2c_driver ssif_i2c_driver = { | |
1926 | .class = I2C_CLASS_HWMON, | |
1927 | .driver = { | |
1928 | .owner = THIS_MODULE, | |
1929 | .name = DEVICE_NAME | |
1930 | }, | |
1931 | .probe = ssif_probe, | |
1932 | .remove = ssif_remove, | |
91620521 | 1933 | .alert = ssif_alert, |
25930707 CM |
1934 | .id_table = ssif_id, |
1935 | .detect = ssif_detect | |
1936 | }; | |
1937 | ||
1938 | static int init_ipmi_ssif(void) | |
1939 | { | |
1940 | int i; | |
1941 | int rv; | |
1942 | ||
1943 | if (initialized) | |
1944 | return 0; | |
1945 | ||
1946 | pr_info("IPMI SSIF Interface driver\n"); | |
1947 | ||
1948 | /* build list for i2c from addr list */ | |
1949 | for (i = 0; i < num_addrs; i++) { | |
1950 | rv = new_ssif_client(addr[i], adapter_name[i], | |
1951 | dbg[i], slave_addrs[i], | |
1952 | SI_HARDCODED); | |
d467f7a4 | 1953 | if (rv) |
25930707 CM |
1954 | pr_err(PFX |
1955 | "Couldn't add hardcoded device at addr 0x%x\n", | |
1956 | addr[i]); | |
1957 | } | |
1958 | ||
1959 | if (ssif_tryacpi) | |
1960 | ssif_i2c_driver.driver.acpi_match_table = | |
1961 | ACPI_PTR(ssif_acpi_match); | |
1962 | if (ssif_trydmi) | |
1963 | dmi_iterator(); | |
1964 | if (ssif_tryacpi) | |
1965 | spmi_find_bmc(); | |
1966 | ||
1967 | ssif_i2c_driver.address_list = ssif_address_list(); | |
1968 | ||
1969 | rv = i2c_add_driver(&ssif_i2c_driver); | |
1970 | if (!rv) | |
1971 | initialized = true; | |
1972 | ||
1973 | return rv; | |
1974 | } | |
1975 | module_init(init_ipmi_ssif); | |
1976 | ||
1977 | static void cleanup_ipmi_ssif(void) | |
1978 | { | |
1979 | if (!initialized) | |
1980 | return; | |
1981 | ||
1982 | initialized = false; | |
1983 | ||
1984 | i2c_del_driver(&ssif_i2c_driver); | |
1985 | ||
1986 | free_ssif_clients(); | |
1987 | } | |
1988 | module_exit(cleanup_ipmi_ssif); | |
1989 | ||
1990 | MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>"); | |
1991 | MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus"); | |
1992 | MODULE_LICENSE("GPL"); |