Commit | Line | Data |
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243ac210 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
1da177e4 LT |
2 | /* |
3 | * ipmi_si.c | |
4 | * | |
5 | * The interface to the IPMI driver for the system interfaces (KCS, SMIC, | |
6 | * BT). | |
7 | * | |
8 | * Author: MontaVista Software, Inc. | |
9 | * Corey Minyard <minyard@mvista.com> | |
10 | * source@mvista.com | |
11 | * | |
12 | * Copyright 2002 MontaVista Software Inc. | |
dba9b4f6 | 13 | * Copyright 2006 IBM Corp., Christian Krafft <krafft@de.ibm.com> |
1da177e4 LT |
14 | */ |
15 | ||
16 | /* | |
17 | * This file holds the "policy" for the interface to the SMI state | |
18 | * machine. It does the configuration, handles timers and interrupts, | |
19 | * and drives the real SMI state machine. | |
20 | */ | |
21 | ||
25880f7d JP |
22 | #define pr_fmt(fmt) "ipmi_si: " fmt |
23 | ||
1da177e4 LT |
24 | #include <linux/module.h> |
25 | #include <linux/moduleparam.h> | |
1da177e4 | 26 | #include <linux/sched.h> |
07412736 | 27 | #include <linux/seq_file.h> |
1da177e4 LT |
28 | #include <linux/timer.h> |
29 | #include <linux/errno.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/list.h> | |
ea94027b | 34 | #include <linux/notifier.h> |
b0defcdb | 35 | #include <linux/mutex.h> |
e9a705a0 | 36 | #include <linux/kthread.h> |
1da177e4 | 37 | #include <asm/irq.h> |
1da177e4 LT |
38 | #include <linux/interrupt.h> |
39 | #include <linux/rcupdate.h> | |
16f4232c | 40 | #include <linux/ipmi.h> |
1da177e4 | 41 | #include <linux/ipmi_smi.h> |
1e89a499 | 42 | #include "ipmi_si.h" |
104fb25f | 43 | #include "ipmi_si_sm.h" |
b361e27b CM |
44 | #include <linux/string.h> |
45 | #include <linux/ctype.h> | |
dba9b4f6 | 46 | |
1da177e4 LT |
47 | /* Measure times between events in the driver. */ |
48 | #undef DEBUG_TIMING | |
49 | ||
50 | /* Call every 10 ms. */ | |
51 | #define SI_TIMEOUT_TIME_USEC 10000 | |
52 | #define SI_USEC_PER_JIFFY (1000000/HZ) | |
53 | #define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY) | |
54 | #define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a | |
c305e3d3 | 55 | short timeout */ |
1da177e4 LT |
56 | |
57 | enum si_intf_state { | |
58 | SI_NORMAL, | |
59 | SI_GETTING_FLAGS, | |
60 | SI_GETTING_EVENTS, | |
61 | SI_CLEARING_FLAGS, | |
1da177e4 | 62 | SI_GETTING_MESSAGES, |
d9b7e4f7 CM |
63 | SI_CHECKING_ENABLES, |
64 | SI_SETTING_ENABLES | |
1da177e4 LT |
65 | /* FIXME - add watchdog stuff. */ |
66 | }; | |
67 | ||
9dbf68f9 CM |
68 | /* Some BT-specific defines we need here. */ |
69 | #define IPMI_BT_INTMASK_REG 2 | |
70 | #define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2 | |
71 | #define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1 | |
72 | ||
95e300c0 | 73 | static const char * const si_to_str[] = { "invalid", "kcs", "smic", "bt" }; |
1da177e4 | 74 | |
dd7450ca | 75 | static bool initialized; |
bb398a4c | 76 | |
64959e2d CM |
77 | /* |
78 | * Indexes into stats[] in smi_info below. | |
79 | */ | |
ba8ff1c6 CM |
80 | enum si_stat_indexes { |
81 | /* | |
82 | * Number of times the driver requested a timer while an operation | |
83 | * was in progress. | |
84 | */ | |
85 | SI_STAT_short_timeouts = 0, | |
86 | ||
87 | /* | |
88 | * Number of times the driver requested a timer while nothing was in | |
89 | * progress. | |
90 | */ | |
91 | SI_STAT_long_timeouts, | |
92 | ||
93 | /* Number of times the interface was idle while being polled. */ | |
94 | SI_STAT_idles, | |
95 | ||
96 | /* Number of interrupts the driver handled. */ | |
97 | SI_STAT_interrupts, | |
98 | ||
99 | /* Number of time the driver got an ATTN from the hardware. */ | |
100 | SI_STAT_attentions, | |
64959e2d | 101 | |
ba8ff1c6 CM |
102 | /* Number of times the driver requested flags from the hardware. */ |
103 | SI_STAT_flag_fetches, | |
104 | ||
105 | /* Number of times the hardware didn't follow the state machine. */ | |
106 | SI_STAT_hosed_count, | |
107 | ||
108 | /* Number of completed messages. */ | |
109 | SI_STAT_complete_transactions, | |
110 | ||
111 | /* Number of IPMI events received from the hardware. */ | |
112 | SI_STAT_events, | |
113 | ||
114 | /* Number of watchdog pretimeouts. */ | |
115 | SI_STAT_watchdog_pretimeouts, | |
116 | ||
b3834be5 | 117 | /* Number of asynchronous messages received. */ |
ba8ff1c6 CM |
118 | SI_STAT_incoming_messages, |
119 | ||
120 | ||
121 | /* This *must* remain last, add new values above this. */ | |
122 | SI_NUM_STATS | |
123 | }; | |
64959e2d | 124 | |
c305e3d3 | 125 | struct smi_info { |
57bccb4e | 126 | int si_num; |
a567b623 | 127 | struct ipmi_smi *intf; |
1da177e4 | 128 | struct si_sm_data *si_sm; |
81d02b7f | 129 | const struct si_sm_handlers *handlers; |
1da177e4 | 130 | spinlock_t si_lock; |
b874b985 | 131 | struct ipmi_smi_msg *waiting_msg; |
1da177e4 LT |
132 | struct ipmi_smi_msg *curr_msg; |
133 | enum si_intf_state si_state; | |
134 | ||
c305e3d3 CM |
135 | /* |
136 | * Used to handle the various types of I/O that can occur with | |
137 | * IPMI | |
138 | */ | |
1da177e4 | 139 | struct si_sm_io io; |
1da177e4 | 140 | |
c305e3d3 CM |
141 | /* |
142 | * Per-OEM handler, called from handle_flags(). Returns 1 | |
143 | * when handle_flags() needs to be re-run or 0 indicating it | |
144 | * set si_state itself. | |
145 | */ | |
3ae0e0f9 CM |
146 | int (*oem_data_avail_handler)(struct smi_info *smi_info); |
147 | ||
c305e3d3 CM |
148 | /* |
149 | * Flags from the last GET_MSG_FLAGS command, used when an ATTN | |
150 | * is set to hold the flags until we are done handling everything | |
151 | * from the flags. | |
152 | */ | |
1da177e4 LT |
153 | #define RECEIVE_MSG_AVAIL 0x01 |
154 | #define EVENT_MSG_BUFFER_FULL 0x02 | |
155 | #define WDT_PRE_TIMEOUT_INT 0x08 | |
3ae0e0f9 CM |
156 | #define OEM0_DATA_AVAIL 0x20 |
157 | #define OEM1_DATA_AVAIL 0x40 | |
158 | #define OEM2_DATA_AVAIL 0x80 | |
159 | #define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \ | |
c305e3d3 CM |
160 | OEM1_DATA_AVAIL | \ |
161 | OEM2_DATA_AVAIL) | |
1da177e4 LT |
162 | unsigned char msg_flags; |
163 | ||
40112ae7 | 164 | /* Does the BMC have an event buffer? */ |
7aefac26 | 165 | bool has_event_buffer; |
40112ae7 | 166 | |
c305e3d3 CM |
167 | /* |
168 | * If set to true, this will request events the next time the | |
169 | * state machine is idle. | |
170 | */ | |
1da177e4 LT |
171 | atomic_t req_events; |
172 | ||
c305e3d3 CM |
173 | /* |
174 | * If true, run the state machine to completion on every send | |
175 | * call. Generally used after a panic to make sure stuff goes | |
176 | * out. | |
177 | */ | |
7aefac26 | 178 | bool run_to_completion; |
1da177e4 | 179 | |
1da177e4 LT |
180 | /* The timer for this si. */ |
181 | struct timer_list si_timer; | |
182 | ||
4f7f5551 MY |
183 | /* This flag is set, if the timer can be set */ |
184 | bool timer_can_start; | |
185 | ||
48e8ac29 BS |
186 | /* This flag is set, if the timer is running (timer_pending() isn't enough) */ |
187 | bool timer_running; | |
188 | ||
1da177e4 LT |
189 | /* The time (in jiffies) the last timeout occurred at. */ |
190 | unsigned long last_timeout_jiffies; | |
191 | ||
89986496 CM |
192 | /* Are we waiting for the events, pretimeouts, received msgs? */ |
193 | atomic_t need_watch; | |
194 | ||
c305e3d3 CM |
195 | /* |
196 | * The driver will disable interrupts when it gets into a | |
197 | * situation where it cannot handle messages due to lack of | |
198 | * memory. Once that situation clears up, it will re-enable | |
199 | * interrupts. | |
200 | */ | |
7aefac26 | 201 | bool interrupt_disabled; |
1da177e4 | 202 | |
d9b7e4f7 CM |
203 | /* |
204 | * Does the BMC support events? | |
205 | */ | |
206 | bool supports_event_msg_buff; | |
207 | ||
1e7d6a45 | 208 | /* |
d0882897 CM |
209 | * Can we disable interrupts the global enables receive irq |
210 | * bit? There are currently two forms of brokenness, some | |
211 | * systems cannot disable the bit (which is technically within | |
212 | * the spec but a bad idea) and some systems have the bit | |
213 | * forced to zero even though interrupts work (which is | |
214 | * clearly outside the spec). The next bool tells which form | |
215 | * of brokenness is present. | |
1e7d6a45 | 216 | */ |
d0882897 CM |
217 | bool cannot_disable_irq; |
218 | ||
219 | /* | |
220 | * Some systems are broken and cannot set the irq enable | |
221 | * bit, even if they support interrupts. | |
222 | */ | |
223 | bool irq_enable_broken; | |
1e7d6a45 | 224 | |
340ff31a CM |
225 | /* Is the driver in maintenance mode? */ |
226 | bool in_maintenance_mode; | |
227 | ||
a8df150c CM |
228 | /* |
229 | * Did we get an attention that we did not handle? | |
230 | */ | |
231 | bool got_attn; | |
232 | ||
50c812b2 | 233 | /* From the get device id response... */ |
3ae0e0f9 | 234 | struct ipmi_device_id device_id; |
1da177e4 | 235 | |
cc095f0a CM |
236 | /* Have we added the device group to the device? */ |
237 | bool dev_group_added; | |
238 | ||
1da177e4 | 239 | /* Counters and things for the proc filesystem. */ |
64959e2d | 240 | atomic_t stats[SI_NUM_STATS]; |
a9a2c44f | 241 | |
c305e3d3 | 242 | struct task_struct *thread; |
b0defcdb CM |
243 | |
244 | struct list_head link; | |
1da177e4 LT |
245 | }; |
246 | ||
64959e2d CM |
247 | #define smi_inc_stat(smi, stat) \ |
248 | atomic_inc(&(smi)->stats[SI_STAT_ ## stat]) | |
249 | #define smi_get_stat(smi, stat) \ | |
250 | ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat])) | |
251 | ||
7a453308 CM |
252 | #define IPMI_MAX_INTFS 4 |
253 | static int force_kipmid[IPMI_MAX_INTFS]; | |
a51f4a81 CM |
254 | static int num_force_kipmid; |
255 | ||
7a453308 | 256 | static unsigned int kipmid_max_busy_us[IPMI_MAX_INTFS]; |
ae74e823 MW |
257 | static int num_max_busy_us; |
258 | ||
7aefac26 | 259 | static bool unload_when_empty = true; |
b361e27b | 260 | |
b0defcdb | 261 | static int try_smi_init(struct smi_info *smi); |
71404a2f | 262 | static void cleanup_one_si(struct smi_info *smi_info); |
d2478521 | 263 | static void cleanup_ipmi_si(void); |
b0defcdb | 264 | |
f93aae9f JS |
265 | #ifdef DEBUG_TIMING |
266 | void debug_timestamp(char *msg) | |
267 | { | |
8d73b2ae | 268 | struct timespec64 t; |
f93aae9f | 269 | |
8d73b2ae AB |
270 | ktime_get_ts64(&t); |
271 | pr_debug("**%s: %lld.%9.9ld\n", msg, t.tv_sec, t.tv_nsec); | |
f93aae9f JS |
272 | } |
273 | #else | |
274 | #define debug_timestamp(x) | |
275 | #endif | |
276 | ||
e041c683 | 277 | static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list); |
c305e3d3 | 278 | static int register_xaction_notifier(struct notifier_block *nb) |
ea94027b | 279 | { |
e041c683 | 280 | return atomic_notifier_chain_register(&xaction_notifier_list, nb); |
ea94027b CM |
281 | } |
282 | ||
1da177e4 LT |
283 | static void deliver_recv_msg(struct smi_info *smi_info, |
284 | struct ipmi_smi_msg *msg) | |
285 | { | |
7adf579c | 286 | /* Deliver the message to the upper layer. */ |
0fbecb4f | 287 | ipmi_smi_msg_received(smi_info->intf, msg); |
1da177e4 LT |
288 | } |
289 | ||
4d7cbac7 | 290 | static void return_hosed_msg(struct smi_info *smi_info, int cCode) |
1da177e4 LT |
291 | { |
292 | struct ipmi_smi_msg *msg = smi_info->curr_msg; | |
293 | ||
4d7cbac7 CM |
294 | if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED) |
295 | cCode = IPMI_ERR_UNSPECIFIED; | |
296 | /* else use it as is */ | |
297 | ||
25985edc | 298 | /* Make it a response */ |
1da177e4 LT |
299 | msg->rsp[0] = msg->data[0] | 4; |
300 | msg->rsp[1] = msg->data[1]; | |
4d7cbac7 | 301 | msg->rsp[2] = cCode; |
1da177e4 LT |
302 | msg->rsp_size = 3; |
303 | ||
304 | smi_info->curr_msg = NULL; | |
305 | deliver_recv_msg(smi_info, msg); | |
306 | } | |
307 | ||
308 | static enum si_sm_result start_next_msg(struct smi_info *smi_info) | |
309 | { | |
310 | int rv; | |
1da177e4 | 311 | |
b874b985 | 312 | if (!smi_info->waiting_msg) { |
1da177e4 LT |
313 | smi_info->curr_msg = NULL; |
314 | rv = SI_SM_IDLE; | |
315 | } else { | |
316 | int err; | |
317 | ||
b874b985 CM |
318 | smi_info->curr_msg = smi_info->waiting_msg; |
319 | smi_info->waiting_msg = NULL; | |
f93aae9f | 320 | debug_timestamp("Start2"); |
e041c683 AS |
321 | err = atomic_notifier_call_chain(&xaction_notifier_list, |
322 | 0, smi_info); | |
ea94027b CM |
323 | if (err & NOTIFY_STOP_MASK) { |
324 | rv = SI_SM_CALL_WITHOUT_DELAY; | |
325 | goto out; | |
326 | } | |
1da177e4 LT |
327 | err = smi_info->handlers->start_transaction( |
328 | smi_info->si_sm, | |
329 | smi_info->curr_msg->data, | |
330 | smi_info->curr_msg->data_size); | |
c305e3d3 | 331 | if (err) |
4d7cbac7 | 332 | return_hosed_msg(smi_info, err); |
1da177e4 LT |
333 | |
334 | rv = SI_SM_CALL_WITHOUT_DELAY; | |
335 | } | |
76824852 | 336 | out: |
1da177e4 LT |
337 | return rv; |
338 | } | |
339 | ||
0cfec916 CM |
340 | static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val) |
341 | { | |
4f7f5551 MY |
342 | if (!smi_info->timer_can_start) |
343 | return; | |
0cfec916 CM |
344 | smi_info->last_timeout_jiffies = jiffies; |
345 | mod_timer(&smi_info->si_timer, new_val); | |
346 | smi_info->timer_running = true; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Start a new message and (re)start the timer and thread. | |
351 | */ | |
352 | static void start_new_msg(struct smi_info *smi_info, unsigned char *msg, | |
353 | unsigned int size) | |
354 | { | |
355 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
356 | ||
357 | if (smi_info->thread) | |
358 | wake_up_process(smi_info->thread); | |
359 | ||
360 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, size); | |
361 | } | |
362 | ||
4f7f5551 | 363 | static void start_check_enables(struct smi_info *smi_info) |
ee6cd5f8 CM |
364 | { |
365 | unsigned char msg[2]; | |
366 | ||
367 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
368 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
369 | ||
4f7f5551 | 370 | start_new_msg(smi_info, msg, 2); |
d9b7e4f7 | 371 | smi_info->si_state = SI_CHECKING_ENABLES; |
ee6cd5f8 CM |
372 | } |
373 | ||
4f7f5551 | 374 | static void start_clear_flags(struct smi_info *smi_info) |
1da177e4 LT |
375 | { |
376 | unsigned char msg[3]; | |
377 | ||
378 | /* Make sure the watchdog pre-timeout flag is not set at startup. */ | |
379 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
380 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
381 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
382 | ||
4f7f5551 | 383 | start_new_msg(smi_info, msg, 3); |
1da177e4 LT |
384 | smi_info->si_state = SI_CLEARING_FLAGS; |
385 | } | |
386 | ||
968bf7cc CM |
387 | static void start_getting_msg_queue(struct smi_info *smi_info) |
388 | { | |
389 | smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
390 | smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD; | |
391 | smi_info->curr_msg->data_size = 2; | |
392 | ||
0cfec916 CM |
393 | start_new_msg(smi_info, smi_info->curr_msg->data, |
394 | smi_info->curr_msg->data_size); | |
968bf7cc CM |
395 | smi_info->si_state = SI_GETTING_MESSAGES; |
396 | } | |
397 | ||
398 | static void start_getting_events(struct smi_info *smi_info) | |
399 | { | |
400 | smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
401 | smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; | |
402 | smi_info->curr_msg->data_size = 2; | |
403 | ||
0cfec916 CM |
404 | start_new_msg(smi_info, smi_info->curr_msg->data, |
405 | smi_info->curr_msg->data_size); | |
968bf7cc CM |
406 | smi_info->si_state = SI_GETTING_EVENTS; |
407 | } | |
408 | ||
c305e3d3 CM |
409 | /* |
410 | * When we have a situtaion where we run out of memory and cannot | |
411 | * allocate messages, we just leave them in the BMC and run the system | |
412 | * polled until we can allocate some memory. Once we have some | |
413 | * memory, we will re-enable the interrupt. | |
1e7d6a45 CM |
414 | * |
415 | * Note that we cannot just use disable_irq(), since the interrupt may | |
416 | * be shared. | |
c305e3d3 | 417 | */ |
4f7f5551 | 418 | static inline bool disable_si_irq(struct smi_info *smi_info) |
1da177e4 | 419 | { |
910840f2 | 420 | if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
7aefac26 | 421 | smi_info->interrupt_disabled = true; |
4f7f5551 | 422 | start_check_enables(smi_info); |
968bf7cc | 423 | return true; |
1da177e4 | 424 | } |
968bf7cc | 425 | return false; |
1da177e4 LT |
426 | } |
427 | ||
968bf7cc | 428 | static inline bool enable_si_irq(struct smi_info *smi_info) |
1da177e4 | 429 | { |
910840f2 | 430 | if ((smi_info->io.irq) && (smi_info->interrupt_disabled)) { |
7aefac26 | 431 | smi_info->interrupt_disabled = false; |
4f7f5551 | 432 | start_check_enables(smi_info); |
968bf7cc CM |
433 | return true; |
434 | } | |
435 | return false; | |
436 | } | |
437 | ||
438 | /* | |
439 | * Allocate a message. If unable to allocate, start the interrupt | |
440 | * disable process and return NULL. If able to allocate but | |
441 | * interrupts are disabled, free the message and return NULL after | |
442 | * starting the interrupt enable process. | |
443 | */ | |
444 | static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info) | |
445 | { | |
446 | struct ipmi_smi_msg *msg; | |
447 | ||
448 | msg = ipmi_alloc_smi_msg(); | |
449 | if (!msg) { | |
4f7f5551 | 450 | if (!disable_si_irq(smi_info)) |
968bf7cc CM |
451 | smi_info->si_state = SI_NORMAL; |
452 | } else if (enable_si_irq(smi_info)) { | |
453 | ipmi_free_smi_msg(msg); | |
454 | msg = NULL; | |
1da177e4 | 455 | } |
968bf7cc | 456 | return msg; |
1da177e4 LT |
457 | } |
458 | ||
459 | static void handle_flags(struct smi_info *smi_info) | |
460 | { | |
76824852 | 461 | retry: |
1da177e4 LT |
462 | if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) { |
463 | /* Watchdog pre-timeout */ | |
64959e2d | 464 | smi_inc_stat(smi_info, watchdog_pretimeouts); |
1da177e4 | 465 | |
4f7f5551 | 466 | start_clear_flags(smi_info); |
1da177e4 | 467 | smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; |
0fbecb4f | 468 | ipmi_smi_watchdog_pretimeout(smi_info->intf); |
1da177e4 LT |
469 | } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) { |
470 | /* Messages available. */ | |
968bf7cc CM |
471 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
472 | if (!smi_info->curr_msg) | |
1da177e4 | 473 | return; |
1da177e4 | 474 | |
968bf7cc | 475 | start_getting_msg_queue(smi_info); |
1da177e4 LT |
476 | } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) { |
477 | /* Events available. */ | |
968bf7cc CM |
478 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
479 | if (!smi_info->curr_msg) | |
1da177e4 | 480 | return; |
1da177e4 | 481 | |
968bf7cc | 482 | start_getting_events(smi_info); |
4064d5ef | 483 | } else if (smi_info->msg_flags & OEM_DATA_AVAIL && |
c305e3d3 | 484 | smi_info->oem_data_avail_handler) { |
4064d5ef CM |
485 | if (smi_info->oem_data_avail_handler(smi_info)) |
486 | goto retry; | |
c305e3d3 | 487 | } else |
1da177e4 | 488 | smi_info->si_state = SI_NORMAL; |
1da177e4 LT |
489 | } |
490 | ||
d9b7e4f7 CM |
491 | /* |
492 | * Global enables we care about. | |
493 | */ | |
494 | #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ | |
495 | IPMI_BMC_EVT_MSG_INTR) | |
496 | ||
95c97b59 CM |
497 | static u8 current_global_enables(struct smi_info *smi_info, u8 base, |
498 | bool *irq_on) | |
d9b7e4f7 CM |
499 | { |
500 | u8 enables = 0; | |
501 | ||
502 | if (smi_info->supports_event_msg_buff) | |
503 | enables |= IPMI_BMC_EVT_MSG_BUFF; | |
d9b7e4f7 | 504 | |
910840f2 | 505 | if (((smi_info->io.irq && !smi_info->interrupt_disabled) || |
d0882897 CM |
506 | smi_info->cannot_disable_irq) && |
507 | !smi_info->irq_enable_broken) | |
d9b7e4f7 | 508 | enables |= IPMI_BMC_RCV_MSG_INTR; |
d9b7e4f7 CM |
509 | |
510 | if (smi_info->supports_event_msg_buff && | |
910840f2 | 511 | smi_info->io.irq && !smi_info->interrupt_disabled && |
d0882897 | 512 | !smi_info->irq_enable_broken) |
d9b7e4f7 | 513 | enables |= IPMI_BMC_EVT_MSG_INTR; |
d9b7e4f7 | 514 | |
95c97b59 CM |
515 | *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR); |
516 | ||
d9b7e4f7 CM |
517 | return enables; |
518 | } | |
519 | ||
95c97b59 CM |
520 | static void check_bt_irq(struct smi_info *smi_info, bool irq_on) |
521 | { | |
522 | u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG); | |
523 | ||
524 | irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT; | |
525 | ||
526 | if ((bool)irqstate == irq_on) | |
527 | return; | |
528 | ||
529 | if (irq_on) | |
530 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, | |
531 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
532 | else | |
533 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0); | |
534 | } | |
535 | ||
1da177e4 LT |
536 | static void handle_transaction_done(struct smi_info *smi_info) |
537 | { | |
538 | struct ipmi_smi_msg *msg; | |
1da177e4 | 539 | |
f93aae9f | 540 | debug_timestamp("Done"); |
1da177e4 LT |
541 | switch (smi_info->si_state) { |
542 | case SI_NORMAL: | |
b0defcdb | 543 | if (!smi_info->curr_msg) |
1da177e4 LT |
544 | break; |
545 | ||
546 | smi_info->curr_msg->rsp_size | |
547 | = smi_info->handlers->get_result( | |
548 | smi_info->si_sm, | |
549 | smi_info->curr_msg->rsp, | |
550 | IPMI_MAX_MSG_LENGTH); | |
551 | ||
c305e3d3 CM |
552 | /* |
553 | * Do this here becase deliver_recv_msg() releases the | |
554 | * lock, and a new message can be put in during the | |
555 | * time the lock is released. | |
556 | */ | |
1da177e4 LT |
557 | msg = smi_info->curr_msg; |
558 | smi_info->curr_msg = NULL; | |
559 | deliver_recv_msg(smi_info, msg); | |
560 | break; | |
561 | ||
562 | case SI_GETTING_FLAGS: | |
563 | { | |
564 | unsigned char msg[4]; | |
565 | unsigned int len; | |
566 | ||
567 | /* We got the flags from the SMI, now handle them. */ | |
568 | len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4); | |
569 | if (msg[2] != 0) { | |
c305e3d3 | 570 | /* Error fetching flags, just give up for now. */ |
1da177e4 LT |
571 | smi_info->si_state = SI_NORMAL; |
572 | } else if (len < 4) { | |
c305e3d3 CM |
573 | /* |
574 | * Hmm, no flags. That's technically illegal, but | |
575 | * don't use uninitialized data. | |
576 | */ | |
1da177e4 LT |
577 | smi_info->si_state = SI_NORMAL; |
578 | } else { | |
579 | smi_info->msg_flags = msg[3]; | |
580 | handle_flags(smi_info); | |
581 | } | |
582 | break; | |
583 | } | |
584 | ||
585 | case SI_CLEARING_FLAGS: | |
1da177e4 LT |
586 | { |
587 | unsigned char msg[3]; | |
588 | ||
589 | /* We cleared the flags. */ | |
590 | smi_info->handlers->get_result(smi_info->si_sm, msg, 3); | |
591 | if (msg[2] != 0) { | |
592 | /* Error clearing flags */ | |
910840f2 | 593 | dev_warn(smi_info->io.dev, |
279fbd0c | 594 | "Error clearing flags: %2.2x\n", msg[2]); |
1da177e4 | 595 | } |
d9b7e4f7 | 596 | smi_info->si_state = SI_NORMAL; |
1da177e4 LT |
597 | break; |
598 | } | |
599 | ||
600 | case SI_GETTING_EVENTS: | |
601 | { | |
602 | smi_info->curr_msg->rsp_size | |
603 | = smi_info->handlers->get_result( | |
604 | smi_info->si_sm, | |
605 | smi_info->curr_msg->rsp, | |
606 | IPMI_MAX_MSG_LENGTH); | |
607 | ||
c305e3d3 CM |
608 | /* |
609 | * Do this here becase deliver_recv_msg() releases the | |
610 | * lock, and a new message can be put in during the | |
611 | * time the lock is released. | |
612 | */ | |
1da177e4 LT |
613 | msg = smi_info->curr_msg; |
614 | smi_info->curr_msg = NULL; | |
615 | if (msg->rsp[2] != 0) { | |
616 | /* Error getting event, probably done. */ | |
617 | msg->done(msg); | |
618 | ||
619 | /* Take off the event flag. */ | |
620 | smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
621 | handle_flags(smi_info); | |
622 | } else { | |
64959e2d | 623 | smi_inc_stat(smi_info, events); |
1da177e4 | 624 | |
c305e3d3 CM |
625 | /* |
626 | * Do this before we deliver the message | |
627 | * because delivering the message releases the | |
628 | * lock and something else can mess with the | |
629 | * state. | |
630 | */ | |
1da177e4 LT |
631 | handle_flags(smi_info); |
632 | ||
633 | deliver_recv_msg(smi_info, msg); | |
634 | } | |
635 | break; | |
636 | } | |
637 | ||
638 | case SI_GETTING_MESSAGES: | |
639 | { | |
640 | smi_info->curr_msg->rsp_size | |
641 | = smi_info->handlers->get_result( | |
642 | smi_info->si_sm, | |
643 | smi_info->curr_msg->rsp, | |
644 | IPMI_MAX_MSG_LENGTH); | |
645 | ||
c305e3d3 CM |
646 | /* |
647 | * Do this here becase deliver_recv_msg() releases the | |
648 | * lock, and a new message can be put in during the | |
649 | * time the lock is released. | |
650 | */ | |
1da177e4 LT |
651 | msg = smi_info->curr_msg; |
652 | smi_info->curr_msg = NULL; | |
653 | if (msg->rsp[2] != 0) { | |
654 | /* Error getting event, probably done. */ | |
655 | msg->done(msg); | |
656 | ||
657 | /* Take off the msg flag. */ | |
658 | smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
659 | handle_flags(smi_info); | |
660 | } else { | |
64959e2d | 661 | smi_inc_stat(smi_info, incoming_messages); |
1da177e4 | 662 | |
c305e3d3 CM |
663 | /* |
664 | * Do this before we deliver the message | |
665 | * because delivering the message releases the | |
666 | * lock and something else can mess with the | |
667 | * state. | |
668 | */ | |
1da177e4 LT |
669 | handle_flags(smi_info); |
670 | ||
671 | deliver_recv_msg(smi_info, msg); | |
672 | } | |
673 | break; | |
674 | } | |
675 | ||
d9b7e4f7 | 676 | case SI_CHECKING_ENABLES: |
1da177e4 LT |
677 | { |
678 | unsigned char msg[4]; | |
d9b7e4f7 | 679 | u8 enables; |
95c97b59 | 680 | bool irq_on; |
1da177e4 LT |
681 | |
682 | /* We got the flags from the SMI, now handle them. */ | |
683 | smi_info->handlers->get_result(smi_info->si_sm, msg, 4); | |
684 | if (msg[2] != 0) { | |
910840f2 | 685 | dev_warn(smi_info->io.dev, |
0849bfec | 686 | "Couldn't get irq info: %x.\n", msg[2]); |
910840f2 | 687 | dev_warn(smi_info->io.dev, |
0849bfec | 688 | "Maybe ok, but ipmi might run very slowly.\n"); |
1da177e4 | 689 | smi_info->si_state = SI_NORMAL; |
d9b7e4f7 CM |
690 | break; |
691 | } | |
95c97b59 | 692 | enables = current_global_enables(smi_info, 0, &irq_on); |
910840f2 | 693 | if (smi_info->io.si_type == SI_BT) |
95c97b59 CM |
694 | /* BT has its own interrupt enable bit. */ |
695 | check_bt_irq(smi_info, irq_on); | |
d9b7e4f7 CM |
696 | if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) { |
697 | /* Enables are not correct, fix them. */ | |
1da177e4 LT |
698 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); |
699 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
d9b7e4f7 | 700 | msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK); |
1da177e4 LT |
701 | smi_info->handlers->start_transaction( |
702 | smi_info->si_sm, msg, 3); | |
d9b7e4f7 CM |
703 | smi_info->si_state = SI_SETTING_ENABLES; |
704 | } else if (smi_info->supports_event_msg_buff) { | |
705 | smi_info->curr_msg = ipmi_alloc_smi_msg(); | |
706 | if (!smi_info->curr_msg) { | |
707 | smi_info->si_state = SI_NORMAL; | |
708 | break; | |
709 | } | |
5ac7b2fc | 710 | start_getting_events(smi_info); |
d9b7e4f7 CM |
711 | } else { |
712 | smi_info->si_state = SI_NORMAL; | |
1da177e4 LT |
713 | } |
714 | break; | |
715 | } | |
716 | ||
d9b7e4f7 | 717 | case SI_SETTING_ENABLES: |
1da177e4 LT |
718 | { |
719 | unsigned char msg[4]; | |
720 | ||
1da177e4 | 721 | smi_info->handlers->get_result(smi_info->si_sm, msg, 4); |
d9b7e4f7 | 722 | if (msg[2] != 0) |
910840f2 | 723 | dev_warn(smi_info->io.dev, |
d9b7e4f7 CM |
724 | "Could not set the global enables: 0x%x.\n", |
725 | msg[2]); | |
726 | ||
727 | if (smi_info->supports_event_msg_buff) { | |
728 | smi_info->curr_msg = ipmi_alloc_smi_msg(); | |
729 | if (!smi_info->curr_msg) { | |
730 | smi_info->si_state = SI_NORMAL; | |
731 | break; | |
732 | } | |
5ac7b2fc | 733 | start_getting_events(smi_info); |
ee6cd5f8 | 734 | } else { |
d9b7e4f7 | 735 | smi_info->si_state = SI_NORMAL; |
ee6cd5f8 | 736 | } |
ee6cd5f8 CM |
737 | break; |
738 | } | |
1da177e4 LT |
739 | } |
740 | } | |
741 | ||
c305e3d3 CM |
742 | /* |
743 | * Called on timeouts and events. Timeouts should pass the elapsed | |
744 | * time, interrupts should pass in zero. Must be called with | |
745 | * si_lock held and interrupts disabled. | |
746 | */ | |
1da177e4 LT |
747 | static enum si_sm_result smi_event_handler(struct smi_info *smi_info, |
748 | int time) | |
749 | { | |
750 | enum si_sm_result si_sm_result; | |
751 | ||
76824852 | 752 | restart: |
c305e3d3 CM |
753 | /* |
754 | * There used to be a loop here that waited a little while | |
755 | * (around 25us) before giving up. That turned out to be | |
756 | * pointless, the minimum delays I was seeing were in the 300us | |
757 | * range, which is far too long to wait in an interrupt. So | |
758 | * we just run until the state machine tells us something | |
759 | * happened or it needs a delay. | |
760 | */ | |
1da177e4 LT |
761 | si_sm_result = smi_info->handlers->event(smi_info->si_sm, time); |
762 | time = 0; | |
763 | while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY) | |
1da177e4 | 764 | si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); |
1da177e4 | 765 | |
c305e3d3 | 766 | if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) { |
64959e2d | 767 | smi_inc_stat(smi_info, complete_transactions); |
1da177e4 LT |
768 | |
769 | handle_transaction_done(smi_info); | |
d9dffd2a | 770 | goto restart; |
c305e3d3 | 771 | } else if (si_sm_result == SI_SM_HOSED) { |
64959e2d | 772 | smi_inc_stat(smi_info, hosed_count); |
1da177e4 | 773 | |
c305e3d3 CM |
774 | /* |
775 | * Do the before return_hosed_msg, because that | |
776 | * releases the lock. | |
777 | */ | |
1da177e4 LT |
778 | smi_info->si_state = SI_NORMAL; |
779 | if (smi_info->curr_msg != NULL) { | |
c305e3d3 CM |
780 | /* |
781 | * If we were handling a user message, format | |
782 | * a response to send to the upper layer to | |
783 | * tell it about the error. | |
784 | */ | |
4d7cbac7 | 785 | return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED); |
1da177e4 | 786 | } |
d9dffd2a | 787 | goto restart; |
1da177e4 LT |
788 | } |
789 | ||
4ea18425 CM |
790 | /* |
791 | * We prefer handling attn over new messages. But don't do | |
792 | * this if there is not yet an upper layer to handle anything. | |
793 | */ | |
0fbecb4f | 794 | if (si_sm_result == SI_SM_ATTN || smi_info->got_attn) { |
1da177e4 LT |
795 | unsigned char msg[2]; |
796 | ||
a8df150c CM |
797 | if (smi_info->si_state != SI_NORMAL) { |
798 | /* | |
799 | * We got an ATTN, but we are doing something else. | |
800 | * Handle the ATTN later. | |
801 | */ | |
802 | smi_info->got_attn = true; | |
803 | } else { | |
804 | smi_info->got_attn = false; | |
805 | smi_inc_stat(smi_info, attentions); | |
1da177e4 | 806 | |
a8df150c CM |
807 | /* |
808 | * Got a attn, send down a get message flags to see | |
809 | * what's causing it. It would be better to handle | |
810 | * this in the upper layer, but due to the way | |
811 | * interrupts work with the SMI, that's not really | |
812 | * possible. | |
813 | */ | |
814 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
815 | msg[1] = IPMI_GET_MSG_FLAGS_CMD; | |
1da177e4 | 816 | |
0cfec916 | 817 | start_new_msg(smi_info, msg, 2); |
a8df150c CM |
818 | smi_info->si_state = SI_GETTING_FLAGS; |
819 | goto restart; | |
820 | } | |
1da177e4 LT |
821 | } |
822 | ||
823 | /* If we are currently idle, try to start the next message. */ | |
824 | if (si_sm_result == SI_SM_IDLE) { | |
64959e2d | 825 | smi_inc_stat(smi_info, idles); |
1da177e4 LT |
826 | |
827 | si_sm_result = start_next_msg(smi_info); | |
828 | if (si_sm_result != SI_SM_IDLE) | |
829 | goto restart; | |
c305e3d3 | 830 | } |
1da177e4 LT |
831 | |
832 | if ((si_sm_result == SI_SM_IDLE) | |
c305e3d3 CM |
833 | && (atomic_read(&smi_info->req_events))) { |
834 | /* | |
835 | * We are idle and the upper layer requested that I fetch | |
836 | * events, so do so. | |
837 | */ | |
55162fb1 | 838 | atomic_set(&smi_info->req_events, 0); |
1da177e4 | 839 | |
d9b7e4f7 CM |
840 | /* |
841 | * Take this opportunity to check the interrupt and | |
842 | * message enable state for the BMC. The BMC can be | |
843 | * asynchronously reset, and may thus get interrupts | |
844 | * disable and messages disabled. | |
845 | */ | |
910840f2 | 846 | if (smi_info->supports_event_msg_buff || smi_info->io.irq) { |
4f7f5551 | 847 | start_check_enables(smi_info); |
d9b7e4f7 CM |
848 | } else { |
849 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); | |
850 | if (!smi_info->curr_msg) | |
851 | goto out; | |
1da177e4 | 852 | |
d9b7e4f7 CM |
853 | start_getting_events(smi_info); |
854 | } | |
1da177e4 LT |
855 | goto restart; |
856 | } | |
314ef52f CM |
857 | |
858 | if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) { | |
859 | /* Ok it if fails, the timer will just go off. */ | |
860 | if (del_timer(&smi_info->si_timer)) | |
861 | smi_info->timer_running = false; | |
862 | } | |
863 | ||
76824852 | 864 | out: |
1da177e4 LT |
865 | return si_sm_result; |
866 | } | |
867 | ||
89986496 CM |
868 | static void check_start_timer_thread(struct smi_info *smi_info) |
869 | { | |
870 | if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) { | |
871 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
872 | ||
873 | if (smi_info->thread) | |
874 | wake_up_process(smi_info->thread); | |
875 | ||
876 | start_next_msg(smi_info); | |
877 | smi_event_handler(smi_info, 0); | |
878 | } | |
879 | } | |
880 | ||
82802f96 | 881 | static void flush_messages(void *send_info) |
e45361d7 | 882 | { |
82802f96 | 883 | struct smi_info *smi_info = send_info; |
e45361d7 HK |
884 | enum si_sm_result result; |
885 | ||
886 | /* | |
887 | * Currently, this function is called only in run-to-completion | |
888 | * mode. This means we are single-threaded, no need for locks. | |
889 | */ | |
890 | result = smi_event_handler(smi_info, 0); | |
891 | while (result != SI_SM_IDLE) { | |
892 | udelay(SI_SHORT_TIMEOUT_USEC); | |
893 | result = smi_event_handler(smi_info, SI_SHORT_TIMEOUT_USEC); | |
894 | } | |
895 | } | |
896 | ||
1da177e4 | 897 | static void sender(void *send_info, |
99ab32f3 | 898 | struct ipmi_smi_msg *msg) |
1da177e4 LT |
899 | { |
900 | struct smi_info *smi_info = send_info; | |
1da177e4 | 901 | unsigned long flags; |
1da177e4 | 902 | |
f93aae9f | 903 | debug_timestamp("Enqueue"); |
1da177e4 LT |
904 | |
905 | if (smi_info->run_to_completion) { | |
bda4c30a | 906 | /* |
82802f96 HK |
907 | * If we are running to completion, start it. Upper |
908 | * layer will call flush_messages to clear it out. | |
bda4c30a | 909 | */ |
9f812704 | 910 | smi_info->waiting_msg = msg; |
1da177e4 | 911 | return; |
1da177e4 | 912 | } |
1da177e4 | 913 | |
f60adf42 | 914 | spin_lock_irqsave(&smi_info->si_lock, flags); |
1d86e29b CM |
915 | /* |
916 | * The following two lines don't need to be under the lock for | |
917 | * the lock's sake, but they do need SMP memory barriers to | |
918 | * avoid getting things out of order. We are already claiming | |
919 | * the lock, anyway, so just do it under the lock to avoid the | |
920 | * ordering problem. | |
921 | */ | |
922 | BUG_ON(smi_info->waiting_msg); | |
923 | smi_info->waiting_msg = msg; | |
89986496 | 924 | check_start_timer_thread(smi_info); |
bda4c30a | 925 | spin_unlock_irqrestore(&smi_info->si_lock, flags); |
1da177e4 LT |
926 | } |
927 | ||
7aefac26 | 928 | static void set_run_to_completion(void *send_info, bool i_run_to_completion) |
1da177e4 LT |
929 | { |
930 | struct smi_info *smi_info = send_info; | |
1da177e4 LT |
931 | |
932 | smi_info->run_to_completion = i_run_to_completion; | |
e45361d7 HK |
933 | if (i_run_to_completion) |
934 | flush_messages(smi_info); | |
1da177e4 LT |
935 | } |
936 | ||
ae74e823 | 937 | /* |
8d73b2ae AB |
938 | * Use -1 as a special constant to tell that we are spinning in kipmid |
939 | * looking for something and not delaying between checks | |
ae74e823 | 940 | */ |
8d73b2ae | 941 | #define IPMI_TIME_NOT_BUSY ns_to_ktime(-1ull) |
cbb19cb1 CM |
942 | static inline bool ipmi_thread_busy_wait(enum si_sm_result smi_result, |
943 | const struct smi_info *smi_info, | |
8d73b2ae | 944 | ktime_t *busy_until) |
ae74e823 MW |
945 | { |
946 | unsigned int max_busy_us = 0; | |
947 | ||
57bccb4e CM |
948 | if (smi_info->si_num < num_max_busy_us) |
949 | max_busy_us = kipmid_max_busy_us[smi_info->si_num]; | |
ae74e823 | 950 | if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY) |
8d73b2ae AB |
951 | *busy_until = IPMI_TIME_NOT_BUSY; |
952 | else if (*busy_until == IPMI_TIME_NOT_BUSY) { | |
953 | *busy_until = ktime_get() + max_busy_us * NSEC_PER_USEC; | |
ae74e823 | 954 | } else { |
8d73b2ae AB |
955 | if (unlikely(ktime_get() > *busy_until)) { |
956 | *busy_until = IPMI_TIME_NOT_BUSY; | |
cbb19cb1 | 957 | return false; |
ae74e823 MW |
958 | } |
959 | } | |
cbb19cb1 | 960 | return true; |
ae74e823 MW |
961 | } |
962 | ||
963 | ||
964 | /* | |
965 | * A busy-waiting loop for speeding up IPMI operation. | |
966 | * | |
967 | * Lousy hardware makes this hard. This is only enabled for systems | |
968 | * that are not BT and do not have interrupts. It starts spinning | |
969 | * when an operation is complete or until max_busy tells it to stop | |
970 | * (if that is enabled). See the paragraph on kimid_max_busy_us in | |
971 | * Documentation/IPMI.txt for details. | |
972 | */ | |
a9a2c44f CM |
973 | static int ipmi_thread(void *data) |
974 | { | |
975 | struct smi_info *smi_info = data; | |
e9a705a0 | 976 | unsigned long flags; |
a9a2c44f | 977 | enum si_sm_result smi_result; |
8d73b2ae | 978 | ktime_t busy_until = IPMI_TIME_NOT_BUSY; |
a9a2c44f | 979 | |
8698a745 | 980 | set_user_nice(current, MAX_NICE); |
e9a705a0 | 981 | while (!kthread_should_stop()) { |
ae74e823 MW |
982 | int busy_wait; |
983 | ||
a9a2c44f | 984 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
8a3628d5 | 985 | smi_result = smi_event_handler(smi_info, 0); |
48e8ac29 BS |
986 | |
987 | /* | |
988 | * If the driver is doing something, there is a possible | |
989 | * race with the timer. If the timer handler see idle, | |
990 | * and the thread here sees something else, the timer | |
991 | * handler won't restart the timer even though it is | |
992 | * required. So start it here if necessary. | |
993 | */ | |
994 | if (smi_result != SI_SM_IDLE && !smi_info->timer_running) | |
995 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
996 | ||
a9a2c44f | 997 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
ae74e823 MW |
998 | busy_wait = ipmi_thread_busy_wait(smi_result, smi_info, |
999 | &busy_until); | |
340ff31a | 1000 | if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { |
c305e3d3 | 1001 | ; /* do nothing */ |
340ff31a CM |
1002 | } else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait) { |
1003 | /* | |
1004 | * In maintenance mode we run as fast as | |
1005 | * possible to allow firmware updates to | |
1006 | * complete as fast as possible, but normally | |
1007 | * don't bang on the scheduler. | |
1008 | */ | |
1009 | if (smi_info->in_maintenance_mode) | |
1010 | schedule(); | |
1011 | else | |
1012 | usleep_range(100, 200); | |
1013 | } else if (smi_result == SI_SM_IDLE) { | |
89986496 CM |
1014 | if (atomic_read(&smi_info->need_watch)) { |
1015 | schedule_timeout_interruptible(100); | |
1016 | } else { | |
1017 | /* Wait to be woken up when we are needed. */ | |
1018 | __set_current_state(TASK_INTERRUPTIBLE); | |
1019 | schedule(); | |
1020 | } | |
340ff31a | 1021 | } else { |
8d1f66dc | 1022 | schedule_timeout_interruptible(1); |
340ff31a | 1023 | } |
a9a2c44f | 1024 | } |
a9a2c44f CM |
1025 | return 0; |
1026 | } | |
1027 | ||
1028 | ||
1da177e4 LT |
1029 | static void poll(void *send_info) |
1030 | { | |
1031 | struct smi_info *smi_info = send_info; | |
f60adf42 | 1032 | unsigned long flags = 0; |
7aefac26 | 1033 | bool run_to_completion = smi_info->run_to_completion; |
1da177e4 | 1034 | |
15c62e10 CM |
1035 | /* |
1036 | * Make sure there is some delay in the poll loop so we can | |
1037 | * drive time forward and timeout things. | |
1038 | */ | |
1039 | udelay(10); | |
f60adf42 CM |
1040 | if (!run_to_completion) |
1041 | spin_lock_irqsave(&smi_info->si_lock, flags); | |
15c62e10 | 1042 | smi_event_handler(smi_info, 10); |
f60adf42 CM |
1043 | if (!run_to_completion) |
1044 | spin_unlock_irqrestore(&smi_info->si_lock, flags); | |
1da177e4 LT |
1045 | } |
1046 | ||
1047 | static void request_events(void *send_info) | |
1048 | { | |
1049 | struct smi_info *smi_info = send_info; | |
1050 | ||
b874b985 | 1051 | if (!smi_info->has_event_buffer) |
b361e27b CM |
1052 | return; |
1053 | ||
1da177e4 LT |
1054 | atomic_set(&smi_info->req_events, 1); |
1055 | } | |
1056 | ||
c65ea996 | 1057 | static void set_need_watch(void *send_info, unsigned int watch_mask) |
89986496 CM |
1058 | { |
1059 | struct smi_info *smi_info = send_info; | |
1060 | unsigned long flags; | |
c65ea996 CM |
1061 | int enable; |
1062 | ||
e1891cff | 1063 | enable = !!watch_mask; |
89986496 CM |
1064 | |
1065 | atomic_set(&smi_info->need_watch, enable); | |
1066 | spin_lock_irqsave(&smi_info->si_lock, flags); | |
1067 | check_start_timer_thread(smi_info); | |
1068 | spin_unlock_irqrestore(&smi_info->si_lock, flags); | |
1069 | } | |
1070 | ||
e99e88a9 | 1071 | static void smi_timeout(struct timer_list *t) |
1da177e4 | 1072 | { |
e99e88a9 | 1073 | struct smi_info *smi_info = from_timer(smi_info, t, si_timer); |
1da177e4 LT |
1074 | enum si_sm_result smi_result; |
1075 | unsigned long flags; | |
1076 | unsigned long jiffies_now; | |
c4edff1c | 1077 | long time_diff; |
3326f4f2 | 1078 | long timeout; |
1da177e4 | 1079 | |
1da177e4 | 1080 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
f93aae9f JS |
1081 | debug_timestamp("Timer"); |
1082 | ||
1da177e4 | 1083 | jiffies_now = jiffies; |
c4edff1c | 1084 | time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies) |
1da177e4 LT |
1085 | * SI_USEC_PER_JIFFY); |
1086 | smi_result = smi_event_handler(smi_info, time_diff); | |
1087 | ||
910840f2 | 1088 | if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
1da177e4 | 1089 | /* Running with interrupts, only do long timeouts. */ |
3326f4f2 | 1090 | timeout = jiffies + SI_TIMEOUT_JIFFIES; |
64959e2d | 1091 | smi_inc_stat(smi_info, long_timeouts); |
3326f4f2 | 1092 | goto do_mod_timer; |
1da177e4 LT |
1093 | } |
1094 | ||
c305e3d3 CM |
1095 | /* |
1096 | * If the state machine asks for a short delay, then shorten | |
1097 | * the timer timeout. | |
1098 | */ | |
1da177e4 | 1099 | if (smi_result == SI_SM_CALL_WITH_DELAY) { |
64959e2d | 1100 | smi_inc_stat(smi_info, short_timeouts); |
3326f4f2 | 1101 | timeout = jiffies + 1; |
1da177e4 | 1102 | } else { |
64959e2d | 1103 | smi_inc_stat(smi_info, long_timeouts); |
3326f4f2 | 1104 | timeout = jiffies + SI_TIMEOUT_JIFFIES; |
1da177e4 LT |
1105 | } |
1106 | ||
76824852 | 1107 | do_mod_timer: |
3326f4f2 | 1108 | if (smi_result != SI_SM_IDLE) |
48e8ac29 BS |
1109 | smi_mod_timer(smi_info, timeout); |
1110 | else | |
1111 | smi_info->timer_running = false; | |
1112 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); | |
1da177e4 LT |
1113 | } |
1114 | ||
4f3e8199 | 1115 | irqreturn_t ipmi_si_irq_handler(int irq, void *data) |
1da177e4 LT |
1116 | { |
1117 | struct smi_info *smi_info = data; | |
1118 | unsigned long flags; | |
1da177e4 | 1119 | |
4f3e8199 CM |
1120 | if (smi_info->io.si_type == SI_BT) |
1121 | /* We need to clear the IRQ flag for the BT interface. */ | |
1122 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, | |
1123 | IPMI_BT_INTMASK_CLEAR_IRQ_BIT | |
1124 | | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
1125 | ||
1da177e4 LT |
1126 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
1127 | ||
64959e2d | 1128 | smi_inc_stat(smi_info, interrupts); |
1da177e4 | 1129 | |
f93aae9f JS |
1130 | debug_timestamp("Interrupt"); |
1131 | ||
1da177e4 | 1132 | smi_event_handler(smi_info, 0); |
1da177e4 LT |
1133 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
1134 | return IRQ_HANDLED; | |
1135 | } | |
1136 | ||
a567b623 CM |
1137 | static int smi_start_processing(void *send_info, |
1138 | struct ipmi_smi *intf) | |
453823ba CM |
1139 | { |
1140 | struct smi_info *new_smi = send_info; | |
a51f4a81 | 1141 | int enable = 0; |
453823ba CM |
1142 | |
1143 | new_smi->intf = intf; | |
1144 | ||
1145 | /* Set up the timer that drives the interface. */ | |
e99e88a9 | 1146 | timer_setup(&new_smi->si_timer, smi_timeout, 0); |
4f7f5551 | 1147 | new_smi->timer_can_start = true; |
48e8ac29 | 1148 | smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES); |
453823ba | 1149 | |
27f972d3 | 1150 | /* Try to claim any interrupts. */ |
4f3e8199 CM |
1151 | if (new_smi->io.irq_setup) { |
1152 | new_smi->io.irq_handler_data = new_smi; | |
1153 | new_smi->io.irq_setup(&new_smi->io); | |
1154 | } | |
27f972d3 | 1155 | |
a51f4a81 CM |
1156 | /* |
1157 | * Check if the user forcefully enabled the daemon. | |
1158 | */ | |
57bccb4e CM |
1159 | if (new_smi->si_num < num_force_kipmid) |
1160 | enable = force_kipmid[new_smi->si_num]; | |
df3fe8de CM |
1161 | /* |
1162 | * The BT interface is efficient enough to not need a thread, | |
1163 | * and there is no need for a thread if we have interrupts. | |
1164 | */ | |
910840f2 | 1165 | else if ((new_smi->io.si_type != SI_BT) && (!new_smi->io.irq)) |
a51f4a81 CM |
1166 | enable = 1; |
1167 | ||
1168 | if (enable) { | |
453823ba | 1169 | new_smi->thread = kthread_run(ipmi_thread, new_smi, |
57bccb4e | 1170 | "kipmi%d", new_smi->si_num); |
453823ba | 1171 | if (IS_ERR(new_smi->thread)) { |
910840f2 | 1172 | dev_notice(new_smi->io.dev, "Could not start" |
279fbd0c MS |
1173 | " kernel thread due to error %ld, only using" |
1174 | " timers to drive the interface\n", | |
1175 | PTR_ERR(new_smi->thread)); | |
453823ba CM |
1176 | new_smi->thread = NULL; |
1177 | } | |
1178 | } | |
1179 | ||
1180 | return 0; | |
1181 | } | |
9dbf68f9 | 1182 | |
16f4232c ZY |
1183 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) |
1184 | { | |
1185 | struct smi_info *smi = send_info; | |
1186 | ||
910840f2 CM |
1187 | data->addr_src = smi->io.addr_source; |
1188 | data->dev = smi->io.dev; | |
bb398a4c | 1189 | data->addr_info = smi->io.addr_info; |
910840f2 | 1190 | get_device(smi->io.dev); |
16f4232c ZY |
1191 | |
1192 | return 0; | |
1193 | } | |
1194 | ||
7aefac26 | 1195 | static void set_maintenance_mode(void *send_info, bool enable) |
b9675136 CM |
1196 | { |
1197 | struct smi_info *smi_info = send_info; | |
1198 | ||
1199 | if (!enable) | |
1200 | atomic_set(&smi_info->req_events, 0); | |
340ff31a | 1201 | smi_info->in_maintenance_mode = enable; |
b9675136 CM |
1202 | } |
1203 | ||
7960f18a | 1204 | static void shutdown_smi(void *send_info); |
81d02b7f | 1205 | static const struct ipmi_smi_handlers handlers = { |
1da177e4 | 1206 | .owner = THIS_MODULE, |
453823ba | 1207 | .start_processing = smi_start_processing, |
7960f18a | 1208 | .shutdown = shutdown_smi, |
16f4232c | 1209 | .get_smi_info = get_smi_info, |
1da177e4 LT |
1210 | .sender = sender, |
1211 | .request_events = request_events, | |
89986496 | 1212 | .set_need_watch = set_need_watch, |
b9675136 | 1213 | .set_maintenance_mode = set_maintenance_mode, |
1da177e4 | 1214 | .set_run_to_completion = set_run_to_completion, |
82802f96 | 1215 | .flush_messages = flush_messages, |
1da177e4 LT |
1216 | .poll = poll, |
1217 | }; | |
1218 | ||
b0defcdb | 1219 | static LIST_HEAD(smi_infos); |
d6dfd131 | 1220 | static DEFINE_MUTEX(smi_infos_lock); |
b0defcdb | 1221 | static int smi_num; /* Used to sequence the SMIs */ |
1da177e4 | 1222 | |
99ee6735 | 1223 | static const char * const addr_space_to_str[] = { "i/o", "mem" }; |
b361e27b | 1224 | |
a51f4a81 CM |
1225 | module_param_array(force_kipmid, int, &num_force_kipmid, 0); |
1226 | MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or" | |
1227 | " disabled(0). Normally the IPMI driver auto-detects" | |
1228 | " this, but the value may be overridden by this parm."); | |
7aefac26 | 1229 | module_param(unload_when_empty, bool, 0); |
b361e27b CM |
1230 | MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are" |
1231 | " specified or found, default is 1. Setting to 0" | |
1232 | " is useful for hot add of devices using hotmod."); | |
ae74e823 MW |
1233 | module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644); |
1234 | MODULE_PARM_DESC(kipmid_max_busy_us, | |
1235 | "Max time (in microseconds) to busy-wait for IPMI data before" | |
1236 | " sleeping. 0 (default) means to wait forever. Set to 100-500" | |
1237 | " if kipmid is using up a lot of CPU time."); | |
1da177e4 | 1238 | |
4f3e8199 CM |
1239 | void ipmi_irq_finish_setup(struct si_sm_io *io) |
1240 | { | |
1241 | if (io->si_type == SI_BT) | |
1242 | /* Enable the interrupt in the BT interface. */ | |
1243 | io->outputb(io, IPMI_BT_INTMASK_REG, | |
1244 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
1245 | } | |
1da177e4 | 1246 | |
4f3e8199 | 1247 | void ipmi_irq_start_cleanup(struct si_sm_io *io) |
1da177e4 | 1248 | { |
4f3e8199 | 1249 | if (io->si_type == SI_BT) |
b0defcdb | 1250 | /* Disable the interrupt in the BT interface. */ |
4f3e8199 CM |
1251 | io->outputb(io, IPMI_BT_INTMASK_REG, 0); |
1252 | } | |
1253 | ||
1254 | static void std_irq_cleanup(struct si_sm_io *io) | |
1255 | { | |
1256 | ipmi_irq_start_cleanup(io); | |
1257 | free_irq(io->irq, io->irq_handler_data); | |
1da177e4 | 1258 | } |
1da177e4 | 1259 | |
4f3e8199 | 1260 | int ipmi_std_irq_setup(struct si_sm_io *io) |
1da177e4 LT |
1261 | { |
1262 | int rv; | |
1263 | ||
4f3e8199 | 1264 | if (!io->irq) |
1da177e4 LT |
1265 | return 0; |
1266 | ||
4f3e8199 CM |
1267 | rv = request_irq(io->irq, |
1268 | ipmi_si_irq_handler, | |
1269 | IRQF_SHARED, | |
104fb25f | 1270 | SI_DEVICE_NAME, |
4f3e8199 | 1271 | io->irq_handler_data); |
1da177e4 | 1272 | if (rv) { |
4f3e8199 | 1273 | dev_warn(io->dev, "%s unable to claim interrupt %d," |
279fbd0c | 1274 | " running polled\n", |
104fb25f | 1275 | SI_DEVICE_NAME, io->irq); |
4f3e8199 | 1276 | io->irq = 0; |
1da177e4 | 1277 | } else { |
4f3e8199 CM |
1278 | io->irq_cleanup = std_irq_cleanup; |
1279 | ipmi_irq_finish_setup(io); | |
1280 | dev_info(io->dev, "Using irq %d\n", io->irq); | |
1da177e4 LT |
1281 | } |
1282 | ||
1283 | return rv; | |
1284 | } | |
1285 | ||
40112ae7 | 1286 | static int wait_for_msg_done(struct smi_info *smi_info) |
1da177e4 | 1287 | { |
50c812b2 | 1288 | enum si_sm_result smi_result; |
1da177e4 LT |
1289 | |
1290 | smi_result = smi_info->handlers->event(smi_info->si_sm, 0); | |
c305e3d3 | 1291 | for (;;) { |
c3e7e791 CM |
1292 | if (smi_result == SI_SM_CALL_WITH_DELAY || |
1293 | smi_result == SI_SM_CALL_WITH_TICK_DELAY) { | |
da4cd8df | 1294 | schedule_timeout_uninterruptible(1); |
1da177e4 | 1295 | smi_result = smi_info->handlers->event( |
e21404dc | 1296 | smi_info->si_sm, jiffies_to_usecs(1)); |
c305e3d3 | 1297 | } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { |
1da177e4 LT |
1298 | smi_result = smi_info->handlers->event( |
1299 | smi_info->si_sm, 0); | |
c305e3d3 | 1300 | } else |
1da177e4 LT |
1301 | break; |
1302 | } | |
40112ae7 | 1303 | if (smi_result == SI_SM_HOSED) |
c305e3d3 CM |
1304 | /* |
1305 | * We couldn't get the state machine to run, so whatever's at | |
1306 | * the port is probably not an IPMI SMI interface. | |
1307 | */ | |
40112ae7 CM |
1308 | return -ENODEV; |
1309 | ||
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | static int try_get_dev_id(struct smi_info *smi_info) | |
1314 | { | |
1315 | unsigned char msg[2]; | |
1316 | unsigned char *resp; | |
1317 | unsigned long resp_len; | |
1318 | int rv = 0; | |
1319 | ||
1320 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1321 | if (!resp) | |
1322 | return -ENOMEM; | |
1323 | ||
1324 | /* | |
1325 | * Do a Get Device ID command, since it comes back with some | |
1326 | * useful info. | |
1327 | */ | |
1328 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1329 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1330 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1331 | ||
1332 | rv = wait_for_msg_done(smi_info); | |
1333 | if (rv) | |
1da177e4 | 1334 | goto out; |
1da177e4 | 1335 | |
1da177e4 LT |
1336 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
1337 | resp, IPMI_MAX_MSG_LENGTH); | |
1da177e4 | 1338 | |
d8c98618 | 1339 | /* Check and record info from the get device id, in case we need it. */ |
c468f911 JK |
1340 | rv = ipmi_demangle_device_id(resp[0] >> 2, resp[1], |
1341 | resp + 2, resp_len - 2, &smi_info->device_id); | |
1da177e4 | 1342 | |
76824852 | 1343 | out: |
1da177e4 LT |
1344 | kfree(resp); |
1345 | return rv; | |
1346 | } | |
1347 | ||
d0882897 | 1348 | static int get_global_enables(struct smi_info *smi_info, u8 *enables) |
1e7d6a45 CM |
1349 | { |
1350 | unsigned char msg[3]; | |
1351 | unsigned char *resp; | |
1352 | unsigned long resp_len; | |
1353 | int rv; | |
1354 | ||
1355 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
d0882897 CM |
1356 | if (!resp) |
1357 | return -ENOMEM; | |
1e7d6a45 CM |
1358 | |
1359 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1360 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1361 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1362 | ||
1363 | rv = wait_for_msg_done(smi_info); | |
1364 | if (rv) { | |
910840f2 | 1365 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1366 | "Error getting response from get global enables command: %d\n", |
1367 | rv); | |
1e7d6a45 CM |
1368 | goto out; |
1369 | } | |
1370 | ||
1371 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1372 | resp, IPMI_MAX_MSG_LENGTH); | |
1373 | ||
1374 | if (resp_len < 4 || | |
1375 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1376 | resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || | |
1377 | resp[2] != 0) { | |
910840f2 | 1378 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1379 | "Invalid return from get global enables command: %ld %x %x %x\n", |
1380 | resp_len, resp[0], resp[1], resp[2]); | |
1e7d6a45 CM |
1381 | rv = -EINVAL; |
1382 | goto out; | |
d0882897 CM |
1383 | } else { |
1384 | *enables = resp[3]; | |
1e7d6a45 CM |
1385 | } |
1386 | ||
d0882897 CM |
1387 | out: |
1388 | kfree(resp); | |
1389 | return rv; | |
1390 | } | |
1391 | ||
1392 | /* | |
1393 | * Returns 1 if it gets an error from the command. | |
1394 | */ | |
1395 | static int set_global_enables(struct smi_info *smi_info, u8 enables) | |
1396 | { | |
1397 | unsigned char msg[3]; | |
1398 | unsigned char *resp; | |
1399 | unsigned long resp_len; | |
1400 | int rv; | |
1401 | ||
1402 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1403 | if (!resp) | |
1404 | return -ENOMEM; | |
1e7d6a45 CM |
1405 | |
1406 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1407 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
d0882897 | 1408 | msg[2] = enables; |
1e7d6a45 CM |
1409 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); |
1410 | ||
1411 | rv = wait_for_msg_done(smi_info); | |
1412 | if (rv) { | |
910840f2 | 1413 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1414 | "Error getting response from set global enables command: %d\n", |
1415 | rv); | |
1e7d6a45 CM |
1416 | goto out; |
1417 | } | |
1418 | ||
1419 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1420 | resp, IPMI_MAX_MSG_LENGTH); | |
1421 | ||
1422 | if (resp_len < 3 || | |
1423 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1424 | resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { | |
910840f2 | 1425 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1426 | "Invalid return from set global enables command: %ld %x %x\n", |
1427 | resp_len, resp[0], resp[1]); | |
1e7d6a45 CM |
1428 | rv = -EINVAL; |
1429 | goto out; | |
1430 | } | |
1431 | ||
d0882897 CM |
1432 | if (resp[2] != 0) |
1433 | rv = 1; | |
1434 | ||
1435 | out: | |
1436 | kfree(resp); | |
1437 | return rv; | |
1438 | } | |
1439 | ||
1440 | /* | |
1441 | * Some BMCs do not support clearing the receive irq bit in the global | |
1442 | * enables (even if they don't support interrupts on the BMC). Check | |
1443 | * for this and handle it properly. | |
1444 | */ | |
1445 | static void check_clr_rcv_irq(struct smi_info *smi_info) | |
1446 | { | |
1447 | u8 enables = 0; | |
1448 | int rv; | |
1449 | ||
1450 | rv = get_global_enables(smi_info, &enables); | |
1451 | if (!rv) { | |
1452 | if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0) | |
1453 | /* Already clear, should work ok. */ | |
1454 | return; | |
1455 | ||
1456 | enables &= ~IPMI_BMC_RCV_MSG_INTR; | |
1457 | rv = set_global_enables(smi_info, enables); | |
1458 | } | |
1459 | ||
1460 | if (rv < 0) { | |
910840f2 | 1461 | dev_err(smi_info->io.dev, |
d0882897 CM |
1462 | "Cannot check clearing the rcv irq: %d\n", rv); |
1463 | return; | |
1464 | } | |
1465 | ||
1466 | if (rv) { | |
1e7d6a45 CM |
1467 | /* |
1468 | * An error when setting the event buffer bit means | |
1469 | * clearing the bit is not supported. | |
1470 | */ | |
910840f2 | 1471 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1472 | "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
1473 | smi_info->cannot_disable_irq = true; | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * Some BMCs do not support setting the interrupt bits in the global | |
1479 | * enables even if they support interrupts. Clearly bad, but we can | |
1480 | * compensate. | |
1481 | */ | |
1482 | static void check_set_rcv_irq(struct smi_info *smi_info) | |
1483 | { | |
1484 | u8 enables = 0; | |
1485 | int rv; | |
1486 | ||
910840f2 | 1487 | if (!smi_info->io.irq) |
d0882897 CM |
1488 | return; |
1489 | ||
1490 | rv = get_global_enables(smi_info, &enables); | |
1491 | if (!rv) { | |
1492 | enables |= IPMI_BMC_RCV_MSG_INTR; | |
1493 | rv = set_global_enables(smi_info, enables); | |
1494 | } | |
1495 | ||
1496 | if (rv < 0) { | |
910840f2 | 1497 | dev_err(smi_info->io.dev, |
d0882897 CM |
1498 | "Cannot check setting the rcv irq: %d\n", rv); |
1499 | return; | |
1500 | } | |
1501 | ||
1502 | if (rv) { | |
1503 | /* | |
1504 | * An error when setting the event buffer bit means | |
1505 | * setting the bit is not supported. | |
1506 | */ | |
910840f2 | 1507 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1508 | "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
1509 | smi_info->cannot_disable_irq = true; | |
1510 | smi_info->irq_enable_broken = true; | |
1e7d6a45 | 1511 | } |
1e7d6a45 CM |
1512 | } |
1513 | ||
40112ae7 CM |
1514 | static int try_enable_event_buffer(struct smi_info *smi_info) |
1515 | { | |
1516 | unsigned char msg[3]; | |
1517 | unsigned char *resp; | |
1518 | unsigned long resp_len; | |
1519 | int rv = 0; | |
1520 | ||
1521 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1522 | if (!resp) | |
1523 | return -ENOMEM; | |
1524 | ||
1525 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1526 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1527 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1528 | ||
1529 | rv = wait_for_msg_done(smi_info); | |
1530 | if (rv) { | |
25880f7d | 1531 | pr_warn("Error getting response from get global enables command, the event buffer is not enabled\n"); |
40112ae7 CM |
1532 | goto out; |
1533 | } | |
1534 | ||
1535 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1536 | resp, IPMI_MAX_MSG_LENGTH); | |
1537 | ||
1538 | if (resp_len < 4 || | |
1539 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1540 | resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || | |
1541 | resp[2] != 0) { | |
25880f7d | 1542 | pr_warn("Invalid return from get global enables command, cannot enable the event buffer\n"); |
40112ae7 CM |
1543 | rv = -EINVAL; |
1544 | goto out; | |
1545 | } | |
1546 | ||
d9b7e4f7 | 1547 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
40112ae7 | 1548 | /* buffer is already enabled, nothing to do. */ |
d9b7e4f7 | 1549 | smi_info->supports_event_msg_buff = true; |
40112ae7 | 1550 | goto out; |
d9b7e4f7 | 1551 | } |
40112ae7 CM |
1552 | |
1553 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1554 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1555 | msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF; | |
1556 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); | |
1557 | ||
1558 | rv = wait_for_msg_done(smi_info); | |
1559 | if (rv) { | |
25880f7d | 1560 | pr_warn("Error getting response from set global, enables command, the event buffer is not enabled\n"); |
40112ae7 CM |
1561 | goto out; |
1562 | } | |
1563 | ||
1564 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1565 | resp, IPMI_MAX_MSG_LENGTH); | |
1566 | ||
1567 | if (resp_len < 3 || | |
1568 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1569 | resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { | |
25880f7d | 1570 | pr_warn("Invalid return from get global, enables command, not enable the event buffer\n"); |
40112ae7 CM |
1571 | rv = -EINVAL; |
1572 | goto out; | |
1573 | } | |
1574 | ||
1575 | if (resp[2] != 0) | |
1576 | /* | |
1577 | * An error when setting the event buffer bit means | |
1578 | * that the event buffer is not supported. | |
1579 | */ | |
1580 | rv = -ENOENT; | |
d9b7e4f7 CM |
1581 | else |
1582 | smi_info->supports_event_msg_buff = true; | |
1583 | ||
76824852 | 1584 | out: |
40112ae7 CM |
1585 | kfree(resp); |
1586 | return rv; | |
1587 | } | |
1588 | ||
3dd377b5 | 1589 | #define IPMI_SI_ATTR(name) \ |
93b6984b CM |
1590 | static ssize_t name##_show(struct device *dev, \ |
1591 | struct device_attribute *attr, \ | |
1592 | char *buf) \ | |
3dd377b5 CM |
1593 | { \ |
1594 | struct smi_info *smi_info = dev_get_drvdata(dev); \ | |
1595 | \ | |
1596 | return snprintf(buf, 10, "%u\n", smi_get_stat(smi_info, name)); \ | |
1597 | } \ | |
93b6984b | 1598 | static DEVICE_ATTR(name, 0444, name##_show, NULL) |
3dd377b5 | 1599 | |
93b6984b CM |
1600 | static ssize_t type_show(struct device *dev, |
1601 | struct device_attribute *attr, | |
1602 | char *buf) | |
3dd377b5 CM |
1603 | { |
1604 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1605 | ||
1606 | return snprintf(buf, 10, "%s\n", si_to_str[smi_info->io.si_type]); | |
1607 | } | |
93b6984b | 1608 | static DEVICE_ATTR(type, 0444, type_show, NULL); |
3dd377b5 | 1609 | |
93b6984b CM |
1610 | static ssize_t interrupts_enabled_show(struct device *dev, |
1611 | struct device_attribute *attr, | |
1612 | char *buf) | |
3dd377b5 CM |
1613 | { |
1614 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1615 | int enabled = smi_info->io.irq && !smi_info->interrupt_disabled; | |
1616 | ||
1617 | return snprintf(buf, 10, "%d\n", enabled); | |
1618 | } | |
a6f4c331 | 1619 | static DEVICE_ATTR(interrupts_enabled, 0444, |
93b6984b | 1620 | interrupts_enabled_show, NULL); |
3dd377b5 CM |
1621 | |
1622 | IPMI_SI_ATTR(short_timeouts); | |
1623 | IPMI_SI_ATTR(long_timeouts); | |
1624 | IPMI_SI_ATTR(idles); | |
1625 | IPMI_SI_ATTR(interrupts); | |
1626 | IPMI_SI_ATTR(attentions); | |
1627 | IPMI_SI_ATTR(flag_fetches); | |
1628 | IPMI_SI_ATTR(hosed_count); | |
1629 | IPMI_SI_ATTR(complete_transactions); | |
1630 | IPMI_SI_ATTR(events); | |
1631 | IPMI_SI_ATTR(watchdog_pretimeouts); | |
1632 | IPMI_SI_ATTR(incoming_messages); | |
1633 | ||
93b6984b CM |
1634 | static ssize_t params_show(struct device *dev, |
1635 | struct device_attribute *attr, | |
1636 | char *buf) | |
3dd377b5 CM |
1637 | { |
1638 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1639 | ||
1640 | return snprintf(buf, 200, | |
1641 | "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n", | |
1642 | si_to_str[smi_info->io.si_type], | |
f6296bdc | 1643 | addr_space_to_str[smi_info->io.addr_space], |
3dd377b5 CM |
1644 | smi_info->io.addr_data, |
1645 | smi_info->io.regspacing, | |
1646 | smi_info->io.regsize, | |
1647 | smi_info->io.regshift, | |
1648 | smi_info->io.irq, | |
1649 | smi_info->io.slave_addr); | |
1650 | } | |
93b6984b | 1651 | static DEVICE_ATTR(params, 0444, params_show, NULL); |
3dd377b5 CM |
1652 | |
1653 | static struct attribute *ipmi_si_dev_attrs[] = { | |
1654 | &dev_attr_type.attr, | |
1655 | &dev_attr_interrupts_enabled.attr, | |
1656 | &dev_attr_short_timeouts.attr, | |
1657 | &dev_attr_long_timeouts.attr, | |
1658 | &dev_attr_idles.attr, | |
1659 | &dev_attr_interrupts.attr, | |
1660 | &dev_attr_attentions.attr, | |
1661 | &dev_attr_flag_fetches.attr, | |
1662 | &dev_attr_hosed_count.attr, | |
1663 | &dev_attr_complete_transactions.attr, | |
1664 | &dev_attr_events.attr, | |
1665 | &dev_attr_watchdog_pretimeouts.attr, | |
1666 | &dev_attr_incoming_messages.attr, | |
1667 | &dev_attr_params.attr, | |
1668 | NULL | |
1669 | }; | |
1670 | ||
1671 | static const struct attribute_group ipmi_si_dev_attr_group = { | |
1672 | .attrs = ipmi_si_dev_attrs, | |
1673 | }; | |
1674 | ||
3ae0e0f9 CM |
1675 | /* |
1676 | * oem_data_avail_to_receive_msg_avail | |
1677 | * @info - smi_info structure with msg_flags set | |
1678 | * | |
1679 | * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL | |
1680 | * Returns 1 indicating need to re-run handle_flags(). | |
1681 | */ | |
1682 | static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info) | |
1683 | { | |
e8b33617 | 1684 | smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) | |
c305e3d3 | 1685 | RECEIVE_MSG_AVAIL); |
3ae0e0f9 CM |
1686 | return 1; |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * setup_dell_poweredge_oem_data_handler | |
1691 | * @info - smi_info.device_id must be populated | |
1692 | * | |
1693 | * Systems that match, but have firmware version < 1.40 may assert | |
1694 | * OEM0_DATA_AVAIL on their own, without being told via Set Flags that | |
1695 | * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL | |
1696 | * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags | |
1697 | * as RECEIVE_MSG_AVAIL instead. | |
1698 | * | |
1699 | * As Dell has no plans to release IPMI 1.5 firmware that *ever* | |
1700 | * assert the OEM[012] bits, and if it did, the driver would have to | |
1701 | * change to handle that properly, we don't actually check for the | |
1702 | * firmware version. | |
1703 | * Device ID = 0x20 BMC on PowerEdge 8G servers | |
1704 | * Device Revision = 0x80 | |
1705 | * Firmware Revision1 = 0x01 BMC version 1.40 | |
1706 | * Firmware Revision2 = 0x40 BCD encoded | |
1707 | * IPMI Version = 0x51 IPMI 1.5 | |
1708 | * Manufacturer ID = A2 02 00 Dell IANA | |
1709 | * | |
d5a2b89a CM |
1710 | * Additionally, PowerEdge systems with IPMI < 1.5 may also assert |
1711 | * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL. | |
1712 | * | |
3ae0e0f9 CM |
1713 | */ |
1714 | #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20 | |
1715 | #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80 | |
1716 | #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51 | |
50c812b2 | 1717 | #define DELL_IANA_MFR_ID 0x0002a2 |
3ae0e0f9 CM |
1718 | static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info) |
1719 | { | |
1720 | struct ipmi_device_id *id = &smi_info->device_id; | |
50c812b2 | 1721 | if (id->manufacturer_id == DELL_IANA_MFR_ID) { |
d5a2b89a CM |
1722 | if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID && |
1723 | id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV && | |
50c812b2 | 1724 | id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) { |
d5a2b89a CM |
1725 | smi_info->oem_data_avail_handler = |
1726 | oem_data_avail_to_receive_msg_avail; | |
c305e3d3 CM |
1727 | } else if (ipmi_version_major(id) < 1 || |
1728 | (ipmi_version_major(id) == 1 && | |
1729 | ipmi_version_minor(id) < 5)) { | |
d5a2b89a CM |
1730 | smi_info->oem_data_avail_handler = |
1731 | oem_data_avail_to_receive_msg_avail; | |
1732 | } | |
3ae0e0f9 CM |
1733 | } |
1734 | } | |
1735 | ||
ea94027b CM |
1736 | #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA |
1737 | static void return_hosed_msg_badsize(struct smi_info *smi_info) | |
1738 | { | |
1739 | struct ipmi_smi_msg *msg = smi_info->curr_msg; | |
1740 | ||
25985edc | 1741 | /* Make it a response */ |
ea94027b CM |
1742 | msg->rsp[0] = msg->data[0] | 4; |
1743 | msg->rsp[1] = msg->data[1]; | |
1744 | msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH; | |
1745 | msg->rsp_size = 3; | |
1746 | smi_info->curr_msg = NULL; | |
1747 | deliver_recv_msg(smi_info, msg); | |
1748 | } | |
1749 | ||
1750 | /* | |
1751 | * dell_poweredge_bt_xaction_handler | |
1752 | * @info - smi_info.device_id must be populated | |
1753 | * | |
1754 | * Dell PowerEdge servers with the BT interface (x6xx and 1750) will | |
1755 | * not respond to a Get SDR command if the length of the data | |
1756 | * requested is exactly 0x3A, which leads to command timeouts and no | |
1757 | * data returned. This intercepts such commands, and causes userspace | |
1758 | * callers to try again with a different-sized buffer, which succeeds. | |
1759 | */ | |
1760 | ||
1761 | #define STORAGE_NETFN 0x0A | |
1762 | #define STORAGE_CMD_GET_SDR 0x23 | |
1763 | static int dell_poweredge_bt_xaction_handler(struct notifier_block *self, | |
1764 | unsigned long unused, | |
1765 | void *in) | |
1766 | { | |
1767 | struct smi_info *smi_info = in; | |
1768 | unsigned char *data = smi_info->curr_msg->data; | |
1769 | unsigned int size = smi_info->curr_msg->data_size; | |
1770 | if (size >= 8 && | |
1771 | (data[0]>>2) == STORAGE_NETFN && | |
1772 | data[1] == STORAGE_CMD_GET_SDR && | |
1773 | data[7] == 0x3A) { | |
1774 | return_hosed_msg_badsize(smi_info); | |
1775 | return NOTIFY_STOP; | |
1776 | } | |
1777 | return NOTIFY_DONE; | |
1778 | } | |
1779 | ||
1780 | static struct notifier_block dell_poweredge_bt_xaction_notifier = { | |
1781 | .notifier_call = dell_poweredge_bt_xaction_handler, | |
1782 | }; | |
1783 | ||
1784 | /* | |
1785 | * setup_dell_poweredge_bt_xaction_handler | |
1786 | * @info - smi_info.device_id must be filled in already | |
1787 | * | |
1788 | * Fills in smi_info.device_id.start_transaction_pre_hook | |
1789 | * when we know what function to use there. | |
1790 | */ | |
1791 | static void | |
1792 | setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info) | |
1793 | { | |
1794 | struct ipmi_device_id *id = &smi_info->device_id; | |
50c812b2 | 1795 | if (id->manufacturer_id == DELL_IANA_MFR_ID && |
910840f2 | 1796 | smi_info->io.si_type == SI_BT) |
ea94027b CM |
1797 | register_xaction_notifier(&dell_poweredge_bt_xaction_notifier); |
1798 | } | |
1799 | ||
3ae0e0f9 CM |
1800 | /* |
1801 | * setup_oem_data_handler | |
1802 | * @info - smi_info.device_id must be filled in already | |
1803 | * | |
1804 | * Fills in smi_info.device_id.oem_data_available_handler | |
1805 | * when we know what function to use there. | |
1806 | */ | |
1807 | ||
1808 | static void setup_oem_data_handler(struct smi_info *smi_info) | |
1809 | { | |
1810 | setup_dell_poweredge_oem_data_handler(smi_info); | |
1811 | } | |
1812 | ||
ea94027b CM |
1813 | static void setup_xaction_handlers(struct smi_info *smi_info) |
1814 | { | |
1815 | setup_dell_poweredge_bt_xaction_handler(smi_info); | |
1816 | } | |
1817 | ||
d0882897 CM |
1818 | static void check_for_broken_irqs(struct smi_info *smi_info) |
1819 | { | |
1820 | check_clr_rcv_irq(smi_info); | |
1821 | check_set_rcv_irq(smi_info); | |
1822 | } | |
1823 | ||
4f7f5551 | 1824 | static inline void stop_timer_and_thread(struct smi_info *smi_info) |
a9a2c44f | 1825 | { |
bd1c06a4 | 1826 | if (smi_info->thread != NULL) { |
b874b985 | 1827 | kthread_stop(smi_info->thread); |
bd1c06a4 MY |
1828 | smi_info->thread = NULL; |
1829 | } | |
4f7f5551 MY |
1830 | |
1831 | smi_info->timer_can_start = false; | |
c9acc3c4 | 1832 | del_timer_sync(&smi_info->si_timer); |
a9a2c44f CM |
1833 | } |
1834 | ||
7e030d6d | 1835 | static struct smi_info *find_dup_si(struct smi_info *info) |
1da177e4 | 1836 | { |
b0defcdb | 1837 | struct smi_info *e; |
1da177e4 | 1838 | |
b0defcdb | 1839 | list_for_each_entry(e, &smi_infos, link) { |
f6296bdc | 1840 | if (e->io.addr_space != info->io.addr_space) |
b0defcdb | 1841 | continue; |
94671710 CM |
1842 | if (e->io.addr_data == info->io.addr_data) { |
1843 | /* | |
1844 | * This is a cheap hack, ACPI doesn't have a defined | |
1845 | * slave address but SMBIOS does. Pick it up from | |
1846 | * any source that has it available. | |
1847 | */ | |
910840f2 CM |
1848 | if (info->io.slave_addr && !e->io.slave_addr) |
1849 | e->io.slave_addr = info->io.slave_addr; | |
7e030d6d | 1850 | return e; |
94671710 | 1851 | } |
b0defcdb | 1852 | } |
1da177e4 | 1853 | |
7e030d6d | 1854 | return NULL; |
b0defcdb | 1855 | } |
1da177e4 | 1856 | |
bb398a4c | 1857 | int ipmi_si_add_smi(struct si_sm_io *io) |
b0defcdb | 1858 | { |
2407d77a | 1859 | int rv = 0; |
bb398a4c | 1860 | struct smi_info *new_smi, *dup; |
b0defcdb | 1861 | |
41b766d6 CM |
1862 | /* |
1863 | * If the user gave us a hard-coded device at the same | |
1864 | * address, they presumably want us to use it and not what is | |
1865 | * in the firmware. | |
1866 | */ | |
3bb8ea40 | 1867 | if (io->addr_source != SI_HARDCODED && io->addr_source != SI_HOTMOD && |
f6296bdc | 1868 | ipmi_si_hardcode_match(io->addr_space, io->addr_data)) { |
41b766d6 CM |
1869 | dev_info(io->dev, |
1870 | "Hard-coded device at this address already exists"); | |
1871 | return -ENODEV; | |
1872 | } | |
1873 | ||
bb398a4c | 1874 | if (!io->io_setup) { |
f6296bdc | 1875 | if (io->addr_space == IPMI_IO_ADDR_SPACE) { |
58e27635 | 1876 | io->io_setup = ipmi_si_port_setup; |
f6296bdc | 1877 | } else if (io->addr_space == IPMI_MEM_ADDR_SPACE) { |
58e27635 | 1878 | io->io_setup = ipmi_si_mem_setup; |
e1eeb7f8 CM |
1879 | } else { |
1880 | return -EINVAL; | |
1881 | } | |
1882 | } | |
1883 | ||
67f4fb02 | 1884 | new_smi = kzalloc(sizeof(*new_smi), GFP_KERNEL); |
bb398a4c CM |
1885 | if (!new_smi) |
1886 | return -ENOMEM; | |
67f4fb02 | 1887 | spin_lock_init(&new_smi->si_lock); |
bb398a4c CM |
1888 | |
1889 | new_smi->io = *io; | |
1890 | ||
d6dfd131 | 1891 | mutex_lock(&smi_infos_lock); |
7e030d6d CM |
1892 | dup = find_dup_si(new_smi); |
1893 | if (dup) { | |
910840f2 CM |
1894 | if (new_smi->io.addr_source == SI_ACPI && |
1895 | dup->io.addr_source == SI_SMBIOS) { | |
7e030d6d | 1896 | /* We prefer ACPI over SMBIOS. */ |
910840f2 | 1897 | dev_info(dup->io.dev, |
7e030d6d | 1898 | "Removing SMBIOS-specified %s state machine in favor of ACPI\n", |
910840f2 | 1899 | si_to_str[new_smi->io.si_type]); |
7e030d6d CM |
1900 | cleanup_one_si(dup); |
1901 | } else { | |
910840f2 | 1902 | dev_info(new_smi->io.dev, |
7e030d6d | 1903 | "%s-specified %s state machine: duplicate\n", |
910840f2 CM |
1904 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1905 | si_to_str[new_smi->io.si_type]); | |
7e030d6d | 1906 | rv = -EBUSY; |
c0a32fe1 | 1907 | kfree(new_smi); |
7e030d6d CM |
1908 | goto out_err; |
1909 | } | |
b0defcdb | 1910 | } |
1da177e4 | 1911 | |
25880f7d | 1912 | pr_info("Adding %s-specified %s state machine\n", |
910840f2 CM |
1913 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1914 | si_to_str[new_smi->io.si_type]); | |
2407d77a | 1915 | |
2407d77a MG |
1916 | list_add_tail(&new_smi->link, &smi_infos); |
1917 | ||
93c303d2 | 1918 | if (initialized) |
bb398a4c | 1919 | rv = try_smi_init(new_smi); |
2407d77a MG |
1920 | out_err: |
1921 | mutex_unlock(&smi_infos_lock); | |
1922 | return rv; | |
1923 | } | |
1924 | ||
3f724c40 TC |
1925 | /* |
1926 | * Try to start up an interface. Must be called with smi_infos_lock | |
1927 | * held, primarily to keep smi_num consistent, we only one to do these | |
1928 | * one at a time. | |
1929 | */ | |
2407d77a MG |
1930 | static int try_smi_init(struct smi_info *new_smi) |
1931 | { | |
1932 | int rv = 0; | |
1933 | int i; | |
1934 | ||
25880f7d | 1935 | pr_info("Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n", |
910840f2 CM |
1936 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1937 | si_to_str[new_smi->io.si_type], | |
f6296bdc | 1938 | addr_space_to_str[new_smi->io.addr_space], |
bb2a08c0 | 1939 | new_smi->io.addr_data, |
910840f2 | 1940 | new_smi->io.slave_addr, new_smi->io.irq); |
2407d77a | 1941 | |
910840f2 | 1942 | switch (new_smi->io.si_type) { |
b0defcdb | 1943 | case SI_KCS: |
1da177e4 | 1944 | new_smi->handlers = &kcs_smi_handlers; |
b0defcdb CM |
1945 | break; |
1946 | ||
1947 | case SI_SMIC: | |
1da177e4 | 1948 | new_smi->handlers = &smic_smi_handlers; |
b0defcdb CM |
1949 | break; |
1950 | ||
1951 | case SI_BT: | |
1da177e4 | 1952 | new_smi->handlers = &bt_smi_handlers; |
b0defcdb CM |
1953 | break; |
1954 | ||
1955 | default: | |
1da177e4 LT |
1956 | /* No support for anything else yet. */ |
1957 | rv = -EIO; | |
1958 | goto out_err; | |
1959 | } | |
1960 | ||
57bccb4e | 1961 | new_smi->si_num = smi_num; |
3f724c40 | 1962 | |
1abf71ee | 1963 | /* Do this early so it's available for logs. */ |
910840f2 | 1964 | if (!new_smi->io.dev) { |
90b2d4f1 CM |
1965 | pr_err("IPMI interface added with no device\n"); |
1966 | rv = EIO; | |
1967 | goto out_err; | |
1abf71ee CM |
1968 | } |
1969 | ||
1da177e4 LT |
1970 | /* Allocate the state machine's data and initialize it. */ |
1971 | new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL); | |
b0defcdb | 1972 | if (!new_smi->si_sm) { |
1da177e4 LT |
1973 | rv = -ENOMEM; |
1974 | goto out_err; | |
1975 | } | |
e1eeb7f8 CM |
1976 | new_smi->io.io_size = new_smi->handlers->init_data(new_smi->si_sm, |
1977 | &new_smi->io); | |
1da177e4 LT |
1978 | |
1979 | /* Now that we know the I/O size, we can set up the I/O. */ | |
e1eeb7f8 | 1980 | rv = new_smi->io.io_setup(&new_smi->io); |
1da177e4 | 1981 | if (rv) { |
910840f2 | 1982 | dev_err(new_smi->io.dev, "Could not set up I/O space\n"); |
1da177e4 LT |
1983 | goto out_err; |
1984 | } | |
1985 | ||
1da177e4 LT |
1986 | /* Do low-level detection first. */ |
1987 | if (new_smi->handlers->detect(new_smi->si_sm)) { | |
910840f2 CM |
1988 | if (new_smi->io.addr_source) |
1989 | dev_err(new_smi->io.dev, | |
1990 | "Interface detection failed\n"); | |
1da177e4 LT |
1991 | rv = -ENODEV; |
1992 | goto out_err; | |
1993 | } | |
1994 | ||
c305e3d3 CM |
1995 | /* |
1996 | * Attempt a get device id command. If it fails, we probably | |
1997 | * don't have a BMC here. | |
1998 | */ | |
1da177e4 | 1999 | rv = try_get_dev_id(new_smi); |
b0defcdb | 2000 | if (rv) { |
910840f2 CM |
2001 | if (new_smi->io.addr_source) |
2002 | dev_err(new_smi->io.dev, | |
2003 | "There appears to be no BMC at this location\n"); | |
1da177e4 | 2004 | goto out_err; |
b0defcdb | 2005 | } |
1da177e4 | 2006 | |
3ae0e0f9 | 2007 | setup_oem_data_handler(new_smi); |
ea94027b | 2008 | setup_xaction_handlers(new_smi); |
d0882897 | 2009 | check_for_broken_irqs(new_smi); |
3ae0e0f9 | 2010 | |
b874b985 | 2011 | new_smi->waiting_msg = NULL; |
1da177e4 LT |
2012 | new_smi->curr_msg = NULL; |
2013 | atomic_set(&new_smi->req_events, 0); | |
7aefac26 | 2014 | new_smi->run_to_completion = false; |
64959e2d CM |
2015 | for (i = 0; i < SI_NUM_STATS; i++) |
2016 | atomic_set(&new_smi->stats[i], 0); | |
1da177e4 | 2017 | |
7aefac26 | 2018 | new_smi->interrupt_disabled = true; |
89986496 | 2019 | atomic_set(&new_smi->need_watch, 0); |
1da177e4 | 2020 | |
40112ae7 CM |
2021 | rv = try_enable_event_buffer(new_smi); |
2022 | if (rv == 0) | |
7aefac26 | 2023 | new_smi->has_event_buffer = true; |
40112ae7 | 2024 | |
c305e3d3 CM |
2025 | /* |
2026 | * Start clearing the flags before we enable interrupts or the | |
2027 | * timer to avoid racing with the timer. | |
2028 | */ | |
4f7f5551 | 2029 | start_clear_flags(new_smi); |
d9b7e4f7 CM |
2030 | |
2031 | /* | |
2032 | * IRQ is defined to be set when non-zero. req_events will | |
2033 | * cause a global flags check that will enable interrupts. | |
2034 | */ | |
910840f2 | 2035 | if (new_smi->io.irq) { |
d9b7e4f7 CM |
2036 | new_smi->interrupt_disabled = false; |
2037 | atomic_set(&new_smi->req_events, 1); | |
2038 | } | |
1da177e4 | 2039 | |
3dd377b5 CM |
2040 | dev_set_drvdata(new_smi->io.dev, new_smi); |
2041 | rv = device_add_group(new_smi->io.dev, &ipmi_si_dev_attr_group); | |
2042 | if (rv) { | |
2043 | dev_err(new_smi->io.dev, | |
2044 | "Unable to add device attributes: error %d\n", | |
2045 | rv); | |
71404a2f | 2046 | goto out_err; |
3dd377b5 | 2047 | } |
cc095f0a | 2048 | new_smi->dev_group_added = true; |
3dd377b5 | 2049 | |
1da177e4 LT |
2050 | rv = ipmi_register_smi(&handlers, |
2051 | new_smi, | |
910840f2 CM |
2052 | new_smi->io.dev, |
2053 | new_smi->io.slave_addr); | |
1da177e4 | 2054 | if (rv) { |
910840f2 CM |
2055 | dev_err(new_smi->io.dev, |
2056 | "Unable to register device: error %d\n", | |
279fbd0c | 2057 | rv); |
71404a2f | 2058 | goto out_err; |
1da177e4 LT |
2059 | } |
2060 | ||
3f724c40 TC |
2061 | /* Don't increment till we know we have succeeded. */ |
2062 | smi_num++; | |
2063 | ||
910840f2 CM |
2064 | dev_info(new_smi->io.dev, "IPMI %s interface initialized\n", |
2065 | si_to_str[new_smi->io.si_type]); | |
1da177e4 | 2066 | |
910840f2 | 2067 | WARN_ON(new_smi->io.dev->init_name != NULL); |
b0defcdb | 2068 | |
2512e40e | 2069 | out_err: |
401e7e88 YY |
2070 | if (rv && new_smi->io.io_cleanup) { |
2071 | new_smi->io.io_cleanup(&new_smi->io); | |
2072 | new_smi->io.io_cleanup = NULL; | |
2073 | } | |
2074 | ||
1da177e4 LT |
2075 | return rv; |
2076 | } | |
2077 | ||
41b766d6 | 2078 | static int __init init_ipmi_si(void) |
1da177e4 | 2079 | { |
2407d77a | 2080 | struct smi_info *e; |
06ee4594 | 2081 | enum ipmi_addr_src type = SI_INVALID; |
1da177e4 LT |
2082 | |
2083 | if (initialized) | |
2084 | return 0; | |
1da177e4 | 2085 | |
41b766d6 | 2086 | ipmi_hardcode_init(); |
1da177e4 | 2087 | |
41b766d6 | 2088 | pr_info("IPMI System Interface driver\n"); |
d8cc5267 | 2089 | |
9d70029e CM |
2090 | ipmi_si_platform_init(); |
2091 | ||
13d0b35c | 2092 | ipmi_si_pci_init(); |
b0defcdb | 2093 | |
c6f85a75 | 2094 | ipmi_si_parisc_init(); |
fdbeb7de | 2095 | |
06ee4594 MG |
2096 | /* We prefer devices with interrupts, but in the case of a machine |
2097 | with multiple BMCs we assume that there will be several instances | |
2098 | of a given type so if we succeed in registering a type then also | |
2099 | try to register everything else of the same type */ | |
2407d77a MG |
2100 | mutex_lock(&smi_infos_lock); |
2101 | list_for_each_entry(e, &smi_infos, link) { | |
06ee4594 MG |
2102 | /* Try to register a device if it has an IRQ and we either |
2103 | haven't successfully registered a device yet or this | |
2104 | device has the same type as one we successfully registered */ | |
910840f2 | 2105 | if (e->io.irq && (!type || e->io.addr_source == type)) { |
d8cc5267 | 2106 | if (!try_smi_init(e)) { |
910840f2 | 2107 | type = e->io.addr_source; |
d8cc5267 MG |
2108 | } |
2109 | } | |
2110 | } | |
2111 | ||
06ee4594 | 2112 | /* type will only have been set if we successfully registered an si */ |
bb398a4c CM |
2113 | if (type) |
2114 | goto skip_fallback_noirq; | |
06ee4594 | 2115 | |
d8cc5267 MG |
2116 | /* Fall back to the preferred device */ |
2117 | ||
2118 | list_for_each_entry(e, &smi_infos, link) { | |
910840f2 | 2119 | if (!e->io.irq && (!type || e->io.addr_source == type)) { |
d8cc5267 | 2120 | if (!try_smi_init(e)) { |
910840f2 | 2121 | type = e->io.addr_source; |
d8cc5267 MG |
2122 | } |
2123 | } | |
2407d77a | 2124 | } |
bb398a4c CM |
2125 | |
2126 | skip_fallback_noirq: | |
dd7450ca | 2127 | initialized = true; |
2407d77a MG |
2128 | mutex_unlock(&smi_infos_lock); |
2129 | ||
06ee4594 MG |
2130 | if (type) |
2131 | return 0; | |
2132 | ||
d6dfd131 | 2133 | mutex_lock(&smi_infos_lock); |
b361e27b | 2134 | if (unload_when_empty && list_empty(&smi_infos)) { |
d6dfd131 | 2135 | mutex_unlock(&smi_infos_lock); |
d2478521 | 2136 | cleanup_ipmi_si(); |
25880f7d | 2137 | pr_warn("Unable to find any System Interface(s)\n"); |
1da177e4 | 2138 | return -ENODEV; |
b0defcdb | 2139 | } else { |
d6dfd131 | 2140 | mutex_unlock(&smi_infos_lock); |
b0defcdb | 2141 | return 0; |
1da177e4 | 2142 | } |
1da177e4 LT |
2143 | } |
2144 | module_init(init_ipmi_si); | |
2145 | ||
7960f18a | 2146 | static void shutdown_smi(void *send_info) |
1da177e4 | 2147 | { |
7960f18a | 2148 | struct smi_info *smi_info = send_info; |
b874b985 | 2149 | |
71404a2f CM |
2150 | if (smi_info->dev_group_added) { |
2151 | device_remove_group(smi_info->io.dev, &ipmi_si_dev_attr_group); | |
2152 | smi_info->dev_group_added = false; | |
2153 | } | |
2154 | if (smi_info->io.dev) | |
2155 | dev_set_drvdata(smi_info->io.dev, NULL); | |
b0defcdb | 2156 | |
c305e3d3 | 2157 | /* |
b874b985 CM |
2158 | * Make sure that interrupts, the timer and the thread are |
2159 | * stopped and will not run again. | |
c305e3d3 | 2160 | */ |
71404a2f CM |
2161 | smi_info->interrupt_disabled = true; |
2162 | if (smi_info->io.irq_cleanup) { | |
2163 | smi_info->io.irq_cleanup(&smi_info->io); | |
2164 | smi_info->io.irq_cleanup = NULL; | |
2165 | } | |
2166 | stop_timer_and_thread(smi_info); | |
2167 | ||
2168 | /* | |
2169 | * Wait until we know that we are out of any interrupt | |
2170 | * handlers might have been running before we freed the | |
2171 | * interrupt. | |
2172 | */ | |
17c0eb74 | 2173 | synchronize_rcu(); |
1da177e4 | 2174 | |
c305e3d3 CM |
2175 | /* |
2176 | * Timeouts are stopped, now make sure the interrupts are off | |
b874b985 CM |
2177 | * in the BMC. Note that timers and CPU interrupts are off, |
2178 | * so no need for locks. | |
c305e3d3 | 2179 | */ |
71404a2f CM |
2180 | while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) { |
2181 | poll(smi_info); | |
ee6cd5f8 | 2182 | schedule_timeout_uninterruptible(1); |
ee6cd5f8 | 2183 | } |
71404a2f CM |
2184 | if (smi_info->handlers) |
2185 | disable_si_irq(smi_info); | |
2186 | while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) { | |
2187 | poll(smi_info); | |
da4cd8df | 2188 | schedule_timeout_uninterruptible(1); |
1da177e4 | 2189 | } |
71404a2f CM |
2190 | if (smi_info->handlers) |
2191 | smi_info->handlers->cleanup(smi_info->si_sm); | |
2192 | ||
2193 | if (smi_info->io.addr_source_cleanup) { | |
2194 | smi_info->io.addr_source_cleanup(&smi_info->io); | |
2195 | smi_info->io.addr_source_cleanup = NULL; | |
2196 | } | |
2197 | if (smi_info->io.io_cleanup) { | |
2198 | smi_info->io.io_cleanup(&smi_info->io); | |
2199 | smi_info->io.io_cleanup = NULL; | |
2200 | } | |
1da177e4 | 2201 | |
71404a2f CM |
2202 | kfree(smi_info->si_sm); |
2203 | smi_info->si_sm = NULL; | |
2512e40e CM |
2204 | |
2205 | smi_info->intf = NULL; | |
71404a2f CM |
2206 | } |
2207 | ||
93c303d2 CM |
2208 | /* |
2209 | * Must be called with smi_infos_lock held, to serialize the | |
2210 | * smi_info->intf check. | |
2211 | */ | |
71404a2f CM |
2212 | static void cleanup_one_si(struct smi_info *smi_info) |
2213 | { | |
2214 | if (!smi_info) | |
2215 | return; | |
1da177e4 | 2216 | |
71404a2f | 2217 | list_del(&smi_info->link); |
1da177e4 | 2218 | |
2512e40e | 2219 | if (smi_info->intf) |
93c303d2 | 2220 | ipmi_unregister_smi(smi_info->intf); |
50c812b2 | 2221 | |
71404a2f | 2222 | kfree(smi_info); |
1da177e4 LT |
2223 | } |
2224 | ||
bb398a4c CM |
2225 | int ipmi_si_remove_by_dev(struct device *dev) |
2226 | { | |
2227 | struct smi_info *e; | |
2228 | int rv = -ENOENT; | |
2229 | ||
2230 | mutex_lock(&smi_infos_lock); | |
2231 | list_for_each_entry(e, &smi_infos, link) { | |
2232 | if (e->io.dev == dev) { | |
2233 | cleanup_one_si(e); | |
2234 | rv = 0; | |
2235 | break; | |
2236 | } | |
2237 | } | |
2238 | mutex_unlock(&smi_infos_lock); | |
2239 | ||
2240 | return rv; | |
2241 | } | |
2242 | ||
bdb57b7b CM |
2243 | struct device *ipmi_si_remove_by_data(int addr_space, enum si_type si_type, |
2244 | unsigned long addr) | |
44814ec9 CM |
2245 | { |
2246 | /* remove */ | |
2247 | struct smi_info *e, *tmp_e; | |
bdb57b7b | 2248 | struct device *dev = NULL; |
44814ec9 CM |
2249 | |
2250 | mutex_lock(&smi_infos_lock); | |
2251 | list_for_each_entry_safe(e, tmp_e, &smi_infos, link) { | |
f6296bdc | 2252 | if (e->io.addr_space != addr_space) |
44814ec9 CM |
2253 | continue; |
2254 | if (e->io.si_type != si_type) | |
2255 | continue; | |
bdb57b7b CM |
2256 | if (e->io.addr_data == addr) { |
2257 | dev = get_device(e->io.dev); | |
44814ec9 | 2258 | cleanup_one_si(e); |
bdb57b7b | 2259 | } |
44814ec9 CM |
2260 | } |
2261 | mutex_unlock(&smi_infos_lock); | |
bdb57b7b CM |
2262 | |
2263 | return dev; | |
44814ec9 CM |
2264 | } |
2265 | ||
0dcf334c | 2266 | static void cleanup_ipmi_si(void) |
1da177e4 | 2267 | { |
b0defcdb | 2268 | struct smi_info *e, *tmp_e; |
1da177e4 | 2269 | |
b0defcdb | 2270 | if (!initialized) |
1da177e4 LT |
2271 | return; |
2272 | ||
13d0b35c | 2273 | ipmi_si_pci_shutdown(); |
c6f85a75 CM |
2274 | |
2275 | ipmi_si_parisc_shutdown(); | |
b0defcdb | 2276 | |
9d70029e | 2277 | ipmi_si_platform_shutdown(); |
dba9b4f6 | 2278 | |
d6dfd131 | 2279 | mutex_lock(&smi_infos_lock); |
b0defcdb CM |
2280 | list_for_each_entry_safe(e, tmp_e, &smi_infos, link) |
2281 | cleanup_one_si(e); | |
d6dfd131 | 2282 | mutex_unlock(&smi_infos_lock); |
41b766d6 CM |
2283 | |
2284 | ipmi_si_hardcode_exit(); | |
bdb57b7b | 2285 | ipmi_si_hotmod_exit(); |
1da177e4 LT |
2286 | } |
2287 | module_exit(cleanup_ipmi_si); | |
2288 | ||
0944d889 | 2289 | MODULE_ALIAS("platform:dmi-ipmi-si"); |
1da177e4 | 2290 | MODULE_LICENSE("GPL"); |
1fdd75bd | 2291 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
c305e3d3 CM |
2292 | MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT" |
2293 | " system interfaces."); |