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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 | ||
59cdb2e7 AS |
73 | /* 'invalid' to allow a firmware-specified interface to be disabled */ |
74 | const char *const si_to_str[] = { "invalid", "kcs", "smic", "bt", NULL }; | |
1da177e4 | 75 | |
dd7450ca | 76 | static bool initialized; |
bb398a4c | 77 | |
64959e2d CM |
78 | /* |
79 | * Indexes into stats[] in smi_info below. | |
80 | */ | |
ba8ff1c6 CM |
81 | enum si_stat_indexes { |
82 | /* | |
83 | * Number of times the driver requested a timer while an operation | |
84 | * was in progress. | |
85 | */ | |
86 | SI_STAT_short_timeouts = 0, | |
87 | ||
88 | /* | |
89 | * Number of times the driver requested a timer while nothing was in | |
90 | * progress. | |
91 | */ | |
92 | SI_STAT_long_timeouts, | |
93 | ||
94 | /* Number of times the interface was idle while being polled. */ | |
95 | SI_STAT_idles, | |
96 | ||
97 | /* Number of interrupts the driver handled. */ | |
98 | SI_STAT_interrupts, | |
99 | ||
100 | /* Number of time the driver got an ATTN from the hardware. */ | |
101 | SI_STAT_attentions, | |
64959e2d | 102 | |
ba8ff1c6 CM |
103 | /* Number of times the driver requested flags from the hardware. */ |
104 | SI_STAT_flag_fetches, | |
105 | ||
106 | /* Number of times the hardware didn't follow the state machine. */ | |
107 | SI_STAT_hosed_count, | |
108 | ||
109 | /* Number of completed messages. */ | |
110 | SI_STAT_complete_transactions, | |
111 | ||
112 | /* Number of IPMI events received from the hardware. */ | |
113 | SI_STAT_events, | |
114 | ||
115 | /* Number of watchdog pretimeouts. */ | |
116 | SI_STAT_watchdog_pretimeouts, | |
117 | ||
b3834be5 | 118 | /* Number of asynchronous messages received. */ |
ba8ff1c6 CM |
119 | SI_STAT_incoming_messages, |
120 | ||
121 | ||
122 | /* This *must* remain last, add new values above this. */ | |
123 | SI_NUM_STATS | |
124 | }; | |
64959e2d | 125 | |
c305e3d3 | 126 | struct smi_info { |
57bccb4e | 127 | int si_num; |
a567b623 | 128 | struct ipmi_smi *intf; |
1da177e4 | 129 | struct si_sm_data *si_sm; |
81d02b7f | 130 | const struct si_sm_handlers *handlers; |
1da177e4 | 131 | spinlock_t si_lock; |
b874b985 | 132 | struct ipmi_smi_msg *waiting_msg; |
1da177e4 LT |
133 | struct ipmi_smi_msg *curr_msg; |
134 | enum si_intf_state si_state; | |
135 | ||
c305e3d3 CM |
136 | /* |
137 | * Used to handle the various types of I/O that can occur with | |
138 | * IPMI | |
139 | */ | |
1da177e4 | 140 | struct si_sm_io io; |
1da177e4 | 141 | |
c305e3d3 CM |
142 | /* |
143 | * Per-OEM handler, called from handle_flags(). Returns 1 | |
144 | * when handle_flags() needs to be re-run or 0 indicating it | |
145 | * set si_state itself. | |
146 | */ | |
3ae0e0f9 CM |
147 | int (*oem_data_avail_handler)(struct smi_info *smi_info); |
148 | ||
c305e3d3 CM |
149 | /* |
150 | * Flags from the last GET_MSG_FLAGS command, used when an ATTN | |
151 | * is set to hold the flags until we are done handling everything | |
152 | * from the flags. | |
153 | */ | |
1da177e4 LT |
154 | #define RECEIVE_MSG_AVAIL 0x01 |
155 | #define EVENT_MSG_BUFFER_FULL 0x02 | |
156 | #define WDT_PRE_TIMEOUT_INT 0x08 | |
3ae0e0f9 CM |
157 | #define OEM0_DATA_AVAIL 0x20 |
158 | #define OEM1_DATA_AVAIL 0x40 | |
159 | #define OEM2_DATA_AVAIL 0x80 | |
160 | #define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \ | |
c305e3d3 CM |
161 | OEM1_DATA_AVAIL | \ |
162 | OEM2_DATA_AVAIL) | |
1da177e4 LT |
163 | unsigned char msg_flags; |
164 | ||
40112ae7 | 165 | /* Does the BMC have an event buffer? */ |
7aefac26 | 166 | bool has_event_buffer; |
40112ae7 | 167 | |
c305e3d3 CM |
168 | /* |
169 | * If set to true, this will request events the next time the | |
170 | * state machine is idle. | |
171 | */ | |
1da177e4 LT |
172 | atomic_t req_events; |
173 | ||
c305e3d3 CM |
174 | /* |
175 | * If true, run the state machine to completion on every send | |
176 | * call. Generally used after a panic to make sure stuff goes | |
177 | * out. | |
178 | */ | |
7aefac26 | 179 | bool run_to_completion; |
1da177e4 | 180 | |
1da177e4 LT |
181 | /* The timer for this si. */ |
182 | struct timer_list si_timer; | |
183 | ||
4f7f5551 MY |
184 | /* This flag is set, if the timer can be set */ |
185 | bool timer_can_start; | |
186 | ||
48e8ac29 BS |
187 | /* This flag is set, if the timer is running (timer_pending() isn't enough) */ |
188 | bool timer_running; | |
189 | ||
1da177e4 LT |
190 | /* The time (in jiffies) the last timeout occurred at. */ |
191 | unsigned long last_timeout_jiffies; | |
192 | ||
89986496 CM |
193 | /* Are we waiting for the events, pretimeouts, received msgs? */ |
194 | atomic_t need_watch; | |
195 | ||
c305e3d3 CM |
196 | /* |
197 | * The driver will disable interrupts when it gets into a | |
198 | * situation where it cannot handle messages due to lack of | |
199 | * memory. Once that situation clears up, it will re-enable | |
200 | * interrupts. | |
201 | */ | |
7aefac26 | 202 | bool interrupt_disabled; |
1da177e4 | 203 | |
d9b7e4f7 CM |
204 | /* |
205 | * Does the BMC support events? | |
206 | */ | |
207 | bool supports_event_msg_buff; | |
208 | ||
1e7d6a45 | 209 | /* |
d0882897 CM |
210 | * Can we disable interrupts the global enables receive irq |
211 | * bit? There are currently two forms of brokenness, some | |
212 | * systems cannot disable the bit (which is technically within | |
213 | * the spec but a bad idea) and some systems have the bit | |
214 | * forced to zero even though interrupts work (which is | |
215 | * clearly outside the spec). The next bool tells which form | |
216 | * of brokenness is present. | |
1e7d6a45 | 217 | */ |
d0882897 CM |
218 | bool cannot_disable_irq; |
219 | ||
220 | /* | |
221 | * Some systems are broken and cannot set the irq enable | |
222 | * bit, even if they support interrupts. | |
223 | */ | |
224 | bool irq_enable_broken; | |
1e7d6a45 | 225 | |
340ff31a CM |
226 | /* Is the driver in maintenance mode? */ |
227 | bool in_maintenance_mode; | |
228 | ||
a8df150c CM |
229 | /* |
230 | * Did we get an attention that we did not handle? | |
231 | */ | |
232 | bool got_attn; | |
233 | ||
50c812b2 | 234 | /* From the get device id response... */ |
3ae0e0f9 | 235 | struct ipmi_device_id device_id; |
1da177e4 | 236 | |
cc095f0a CM |
237 | /* Have we added the device group to the device? */ |
238 | bool dev_group_added; | |
239 | ||
1da177e4 | 240 | /* Counters and things for the proc filesystem. */ |
64959e2d | 241 | atomic_t stats[SI_NUM_STATS]; |
a9a2c44f | 242 | |
c305e3d3 | 243 | struct task_struct *thread; |
b0defcdb CM |
244 | |
245 | struct list_head link; | |
1da177e4 LT |
246 | }; |
247 | ||
64959e2d CM |
248 | #define smi_inc_stat(smi, stat) \ |
249 | atomic_inc(&(smi)->stats[SI_STAT_ ## stat]) | |
250 | #define smi_get_stat(smi, stat) \ | |
251 | ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat])) | |
252 | ||
7a453308 CM |
253 | #define IPMI_MAX_INTFS 4 |
254 | static int force_kipmid[IPMI_MAX_INTFS]; | |
a51f4a81 CM |
255 | static int num_force_kipmid; |
256 | ||
7a453308 | 257 | static unsigned int kipmid_max_busy_us[IPMI_MAX_INTFS]; |
ae74e823 MW |
258 | static int num_max_busy_us; |
259 | ||
7aefac26 | 260 | static bool unload_when_empty = true; |
b361e27b | 261 | |
b0defcdb | 262 | static int try_smi_init(struct smi_info *smi); |
71404a2f | 263 | static void cleanup_one_si(struct smi_info *smi_info); |
d2478521 | 264 | static void cleanup_ipmi_si(void); |
b0defcdb | 265 | |
f93aae9f | 266 | #ifdef DEBUG_TIMING |
be850359 | 267 | void debug_timestamp(struct smi_info *smi_info, char *msg) |
f93aae9f | 268 | { |
8d73b2ae | 269 | struct timespec64 t; |
f93aae9f | 270 | |
8d73b2ae | 271 | ktime_get_ts64(&t); |
be850359 CM |
272 | dev_dbg(smi_info->io.dev, "**%s: %lld.%9.9ld\n", |
273 | msg, t.tv_sec, t.tv_nsec); | |
f93aae9f JS |
274 | } |
275 | #else | |
be850359 | 276 | #define debug_timestamp(smi_info, x) |
f93aae9f JS |
277 | #endif |
278 | ||
e041c683 | 279 | static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list); |
c305e3d3 | 280 | static int register_xaction_notifier(struct notifier_block *nb) |
ea94027b | 281 | { |
e041c683 | 282 | return atomic_notifier_chain_register(&xaction_notifier_list, nb); |
ea94027b CM |
283 | } |
284 | ||
1da177e4 LT |
285 | static void deliver_recv_msg(struct smi_info *smi_info, |
286 | struct ipmi_smi_msg *msg) | |
287 | { | |
7adf579c | 288 | /* Deliver the message to the upper layer. */ |
0fbecb4f | 289 | ipmi_smi_msg_received(smi_info->intf, msg); |
1da177e4 LT |
290 | } |
291 | ||
4d7cbac7 | 292 | static void return_hosed_msg(struct smi_info *smi_info, int cCode) |
1da177e4 LT |
293 | { |
294 | struct ipmi_smi_msg *msg = smi_info->curr_msg; | |
295 | ||
4d7cbac7 CM |
296 | if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED) |
297 | cCode = IPMI_ERR_UNSPECIFIED; | |
298 | /* else use it as is */ | |
299 | ||
25985edc | 300 | /* Make it a response */ |
1da177e4 LT |
301 | msg->rsp[0] = msg->data[0] | 4; |
302 | msg->rsp[1] = msg->data[1]; | |
4d7cbac7 | 303 | msg->rsp[2] = cCode; |
1da177e4 LT |
304 | msg->rsp_size = 3; |
305 | ||
306 | smi_info->curr_msg = NULL; | |
307 | deliver_recv_msg(smi_info, msg); | |
308 | } | |
309 | ||
310 | static enum si_sm_result start_next_msg(struct smi_info *smi_info) | |
311 | { | |
312 | int rv; | |
1da177e4 | 313 | |
b874b985 | 314 | if (!smi_info->waiting_msg) { |
1da177e4 LT |
315 | smi_info->curr_msg = NULL; |
316 | rv = SI_SM_IDLE; | |
317 | } else { | |
318 | int err; | |
319 | ||
b874b985 CM |
320 | smi_info->curr_msg = smi_info->waiting_msg; |
321 | smi_info->waiting_msg = NULL; | |
be850359 | 322 | debug_timestamp(smi_info, "Start2"); |
e041c683 AS |
323 | err = atomic_notifier_call_chain(&xaction_notifier_list, |
324 | 0, smi_info); | |
ea94027b CM |
325 | if (err & NOTIFY_STOP_MASK) { |
326 | rv = SI_SM_CALL_WITHOUT_DELAY; | |
327 | goto out; | |
328 | } | |
1da177e4 LT |
329 | err = smi_info->handlers->start_transaction( |
330 | smi_info->si_sm, | |
331 | smi_info->curr_msg->data, | |
332 | smi_info->curr_msg->data_size); | |
c305e3d3 | 333 | if (err) |
4d7cbac7 | 334 | return_hosed_msg(smi_info, err); |
1da177e4 LT |
335 | |
336 | rv = SI_SM_CALL_WITHOUT_DELAY; | |
337 | } | |
76824852 | 338 | out: |
1da177e4 LT |
339 | return rv; |
340 | } | |
341 | ||
0cfec916 CM |
342 | static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val) |
343 | { | |
4f7f5551 MY |
344 | if (!smi_info->timer_can_start) |
345 | return; | |
0cfec916 CM |
346 | smi_info->last_timeout_jiffies = jiffies; |
347 | mod_timer(&smi_info->si_timer, new_val); | |
348 | smi_info->timer_running = true; | |
349 | } | |
350 | ||
351 | /* | |
352 | * Start a new message and (re)start the timer and thread. | |
353 | */ | |
354 | static void start_new_msg(struct smi_info *smi_info, unsigned char *msg, | |
355 | unsigned int size) | |
356 | { | |
357 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
358 | ||
359 | if (smi_info->thread) | |
360 | wake_up_process(smi_info->thread); | |
361 | ||
362 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, size); | |
363 | } | |
364 | ||
4f7f5551 | 365 | static void start_check_enables(struct smi_info *smi_info) |
ee6cd5f8 CM |
366 | { |
367 | unsigned char msg[2]; | |
368 | ||
369 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
370 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
371 | ||
4f7f5551 | 372 | start_new_msg(smi_info, msg, 2); |
d9b7e4f7 | 373 | smi_info->si_state = SI_CHECKING_ENABLES; |
ee6cd5f8 CM |
374 | } |
375 | ||
4f7f5551 | 376 | static void start_clear_flags(struct smi_info *smi_info) |
1da177e4 LT |
377 | { |
378 | unsigned char msg[3]; | |
379 | ||
380 | /* Make sure the watchdog pre-timeout flag is not set at startup. */ | |
381 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
382 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
383 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
384 | ||
4f7f5551 | 385 | start_new_msg(smi_info, msg, 3); |
1da177e4 LT |
386 | smi_info->si_state = SI_CLEARING_FLAGS; |
387 | } | |
388 | ||
968bf7cc CM |
389 | static void start_getting_msg_queue(struct smi_info *smi_info) |
390 | { | |
391 | smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
392 | smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD; | |
393 | smi_info->curr_msg->data_size = 2; | |
394 | ||
0cfec916 CM |
395 | start_new_msg(smi_info, smi_info->curr_msg->data, |
396 | smi_info->curr_msg->data_size); | |
968bf7cc CM |
397 | smi_info->si_state = SI_GETTING_MESSAGES; |
398 | } | |
399 | ||
400 | static void start_getting_events(struct smi_info *smi_info) | |
401 | { | |
402 | smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
403 | smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; | |
404 | smi_info->curr_msg->data_size = 2; | |
405 | ||
0cfec916 CM |
406 | start_new_msg(smi_info, smi_info->curr_msg->data, |
407 | smi_info->curr_msg->data_size); | |
968bf7cc CM |
408 | smi_info->si_state = SI_GETTING_EVENTS; |
409 | } | |
410 | ||
c305e3d3 CM |
411 | /* |
412 | * When we have a situtaion where we run out of memory and cannot | |
413 | * allocate messages, we just leave them in the BMC and run the system | |
414 | * polled until we can allocate some memory. Once we have some | |
415 | * memory, we will re-enable the interrupt. | |
1e7d6a45 CM |
416 | * |
417 | * Note that we cannot just use disable_irq(), since the interrupt may | |
418 | * be shared. | |
c305e3d3 | 419 | */ |
4f7f5551 | 420 | static inline bool disable_si_irq(struct smi_info *smi_info) |
1da177e4 | 421 | { |
910840f2 | 422 | if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
7aefac26 | 423 | smi_info->interrupt_disabled = true; |
4f7f5551 | 424 | start_check_enables(smi_info); |
968bf7cc | 425 | return true; |
1da177e4 | 426 | } |
968bf7cc | 427 | return false; |
1da177e4 LT |
428 | } |
429 | ||
968bf7cc | 430 | static inline bool enable_si_irq(struct smi_info *smi_info) |
1da177e4 | 431 | { |
910840f2 | 432 | if ((smi_info->io.irq) && (smi_info->interrupt_disabled)) { |
7aefac26 | 433 | smi_info->interrupt_disabled = false; |
4f7f5551 | 434 | start_check_enables(smi_info); |
968bf7cc CM |
435 | return true; |
436 | } | |
437 | return false; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Allocate a message. If unable to allocate, start the interrupt | |
442 | * disable process and return NULL. If able to allocate but | |
443 | * interrupts are disabled, free the message and return NULL after | |
444 | * starting the interrupt enable process. | |
445 | */ | |
446 | static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info) | |
447 | { | |
448 | struct ipmi_smi_msg *msg; | |
449 | ||
450 | msg = ipmi_alloc_smi_msg(); | |
451 | if (!msg) { | |
4f7f5551 | 452 | if (!disable_si_irq(smi_info)) |
968bf7cc CM |
453 | smi_info->si_state = SI_NORMAL; |
454 | } else if (enable_si_irq(smi_info)) { | |
455 | ipmi_free_smi_msg(msg); | |
456 | msg = NULL; | |
1da177e4 | 457 | } |
968bf7cc | 458 | return msg; |
1da177e4 LT |
459 | } |
460 | ||
461 | static void handle_flags(struct smi_info *smi_info) | |
462 | { | |
76824852 | 463 | retry: |
1da177e4 LT |
464 | if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) { |
465 | /* Watchdog pre-timeout */ | |
64959e2d | 466 | smi_inc_stat(smi_info, watchdog_pretimeouts); |
1da177e4 | 467 | |
4f7f5551 | 468 | start_clear_flags(smi_info); |
1da177e4 | 469 | smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; |
0fbecb4f | 470 | ipmi_smi_watchdog_pretimeout(smi_info->intf); |
1da177e4 LT |
471 | } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) { |
472 | /* Messages available. */ | |
968bf7cc CM |
473 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
474 | if (!smi_info->curr_msg) | |
1da177e4 | 475 | return; |
1da177e4 | 476 | |
968bf7cc | 477 | start_getting_msg_queue(smi_info); |
1da177e4 LT |
478 | } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) { |
479 | /* Events available. */ | |
968bf7cc CM |
480 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
481 | if (!smi_info->curr_msg) | |
1da177e4 | 482 | return; |
1da177e4 | 483 | |
968bf7cc | 484 | start_getting_events(smi_info); |
4064d5ef | 485 | } else if (smi_info->msg_flags & OEM_DATA_AVAIL && |
c305e3d3 | 486 | smi_info->oem_data_avail_handler) { |
4064d5ef CM |
487 | if (smi_info->oem_data_avail_handler(smi_info)) |
488 | goto retry; | |
c305e3d3 | 489 | } else |
1da177e4 | 490 | smi_info->si_state = SI_NORMAL; |
1da177e4 LT |
491 | } |
492 | ||
d9b7e4f7 CM |
493 | /* |
494 | * Global enables we care about. | |
495 | */ | |
496 | #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ | |
497 | IPMI_BMC_EVT_MSG_INTR) | |
498 | ||
95c97b59 CM |
499 | static u8 current_global_enables(struct smi_info *smi_info, u8 base, |
500 | bool *irq_on) | |
d9b7e4f7 CM |
501 | { |
502 | u8 enables = 0; | |
503 | ||
504 | if (smi_info->supports_event_msg_buff) | |
505 | enables |= IPMI_BMC_EVT_MSG_BUFF; | |
d9b7e4f7 | 506 | |
910840f2 | 507 | if (((smi_info->io.irq && !smi_info->interrupt_disabled) || |
d0882897 CM |
508 | smi_info->cannot_disable_irq) && |
509 | !smi_info->irq_enable_broken) | |
d9b7e4f7 | 510 | enables |= IPMI_BMC_RCV_MSG_INTR; |
d9b7e4f7 CM |
511 | |
512 | if (smi_info->supports_event_msg_buff && | |
910840f2 | 513 | smi_info->io.irq && !smi_info->interrupt_disabled && |
d0882897 | 514 | !smi_info->irq_enable_broken) |
d9b7e4f7 | 515 | enables |= IPMI_BMC_EVT_MSG_INTR; |
d9b7e4f7 | 516 | |
95c97b59 CM |
517 | *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR); |
518 | ||
d9b7e4f7 CM |
519 | return enables; |
520 | } | |
521 | ||
95c97b59 CM |
522 | static void check_bt_irq(struct smi_info *smi_info, bool irq_on) |
523 | { | |
524 | u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG); | |
525 | ||
526 | irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT; | |
527 | ||
528 | if ((bool)irqstate == irq_on) | |
529 | return; | |
530 | ||
531 | if (irq_on) | |
532 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, | |
533 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
534 | else | |
535 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0); | |
536 | } | |
537 | ||
1da177e4 LT |
538 | static void handle_transaction_done(struct smi_info *smi_info) |
539 | { | |
540 | struct ipmi_smi_msg *msg; | |
1da177e4 | 541 | |
be850359 | 542 | debug_timestamp(smi_info, "Done"); |
1da177e4 LT |
543 | switch (smi_info->si_state) { |
544 | case SI_NORMAL: | |
b0defcdb | 545 | if (!smi_info->curr_msg) |
1da177e4 LT |
546 | break; |
547 | ||
548 | smi_info->curr_msg->rsp_size | |
549 | = smi_info->handlers->get_result( | |
550 | smi_info->si_sm, | |
551 | smi_info->curr_msg->rsp, | |
552 | IPMI_MAX_MSG_LENGTH); | |
553 | ||
c305e3d3 CM |
554 | /* |
555 | * Do this here becase deliver_recv_msg() releases the | |
556 | * lock, and a new message can be put in during the | |
557 | * time the lock is released. | |
558 | */ | |
1da177e4 LT |
559 | msg = smi_info->curr_msg; |
560 | smi_info->curr_msg = NULL; | |
561 | deliver_recv_msg(smi_info, msg); | |
562 | break; | |
563 | ||
564 | case SI_GETTING_FLAGS: | |
565 | { | |
566 | unsigned char msg[4]; | |
567 | unsigned int len; | |
568 | ||
569 | /* We got the flags from the SMI, now handle them. */ | |
570 | len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4); | |
571 | if (msg[2] != 0) { | |
c305e3d3 | 572 | /* Error fetching flags, just give up for now. */ |
1da177e4 LT |
573 | smi_info->si_state = SI_NORMAL; |
574 | } else if (len < 4) { | |
c305e3d3 CM |
575 | /* |
576 | * Hmm, no flags. That's technically illegal, but | |
577 | * don't use uninitialized data. | |
578 | */ | |
1da177e4 LT |
579 | smi_info->si_state = SI_NORMAL; |
580 | } else { | |
581 | smi_info->msg_flags = msg[3]; | |
582 | handle_flags(smi_info); | |
583 | } | |
584 | break; | |
585 | } | |
586 | ||
587 | case SI_CLEARING_FLAGS: | |
1da177e4 LT |
588 | { |
589 | unsigned char msg[3]; | |
590 | ||
591 | /* We cleared the flags. */ | |
592 | smi_info->handlers->get_result(smi_info->si_sm, msg, 3); | |
593 | if (msg[2] != 0) { | |
594 | /* Error clearing flags */ | |
ca8c1c53 | 595 | dev_warn_ratelimited(smi_info->io.dev, |
279fbd0c | 596 | "Error clearing flags: %2.2x\n", msg[2]); |
1da177e4 | 597 | } |
d9b7e4f7 | 598 | smi_info->si_state = SI_NORMAL; |
1da177e4 LT |
599 | break; |
600 | } | |
601 | ||
602 | case SI_GETTING_EVENTS: | |
603 | { | |
604 | smi_info->curr_msg->rsp_size | |
605 | = smi_info->handlers->get_result( | |
606 | smi_info->si_sm, | |
607 | smi_info->curr_msg->rsp, | |
608 | IPMI_MAX_MSG_LENGTH); | |
609 | ||
c305e3d3 CM |
610 | /* |
611 | * Do this here becase deliver_recv_msg() releases the | |
612 | * lock, and a new message can be put in during the | |
613 | * time the lock is released. | |
614 | */ | |
1da177e4 LT |
615 | msg = smi_info->curr_msg; |
616 | smi_info->curr_msg = NULL; | |
617 | if (msg->rsp[2] != 0) { | |
618 | /* Error getting event, probably done. */ | |
619 | msg->done(msg); | |
620 | ||
621 | /* Take off the event flag. */ | |
622 | smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
623 | handle_flags(smi_info); | |
624 | } else { | |
64959e2d | 625 | smi_inc_stat(smi_info, events); |
1da177e4 | 626 | |
c305e3d3 CM |
627 | /* |
628 | * Do this before we deliver the message | |
629 | * because delivering the message releases the | |
630 | * lock and something else can mess with the | |
631 | * state. | |
632 | */ | |
1da177e4 LT |
633 | handle_flags(smi_info); |
634 | ||
635 | deliver_recv_msg(smi_info, msg); | |
636 | } | |
637 | break; | |
638 | } | |
639 | ||
640 | case SI_GETTING_MESSAGES: | |
641 | { | |
642 | smi_info->curr_msg->rsp_size | |
643 | = smi_info->handlers->get_result( | |
644 | smi_info->si_sm, | |
645 | smi_info->curr_msg->rsp, | |
646 | IPMI_MAX_MSG_LENGTH); | |
647 | ||
c305e3d3 CM |
648 | /* |
649 | * Do this here becase deliver_recv_msg() releases the | |
650 | * lock, and a new message can be put in during the | |
651 | * time the lock is released. | |
652 | */ | |
1da177e4 LT |
653 | msg = smi_info->curr_msg; |
654 | smi_info->curr_msg = NULL; | |
655 | if (msg->rsp[2] != 0) { | |
656 | /* Error getting event, probably done. */ | |
657 | msg->done(msg); | |
658 | ||
659 | /* Take off the msg flag. */ | |
660 | smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
661 | handle_flags(smi_info); | |
662 | } else { | |
64959e2d | 663 | smi_inc_stat(smi_info, incoming_messages); |
1da177e4 | 664 | |
c305e3d3 CM |
665 | /* |
666 | * Do this before we deliver the message | |
667 | * because delivering the message releases the | |
668 | * lock and something else can mess with the | |
669 | * state. | |
670 | */ | |
1da177e4 LT |
671 | handle_flags(smi_info); |
672 | ||
673 | deliver_recv_msg(smi_info, msg); | |
674 | } | |
675 | break; | |
676 | } | |
677 | ||
d9b7e4f7 | 678 | case SI_CHECKING_ENABLES: |
1da177e4 LT |
679 | { |
680 | unsigned char msg[4]; | |
d9b7e4f7 | 681 | u8 enables; |
95c97b59 | 682 | bool irq_on; |
1da177e4 LT |
683 | |
684 | /* We got the flags from the SMI, now handle them. */ | |
685 | smi_info->handlers->get_result(smi_info->si_sm, msg, 4); | |
686 | if (msg[2] != 0) { | |
ca8c1c53 WY |
687 | dev_warn_ratelimited(smi_info->io.dev, |
688 | "Couldn't get irq info: %x,\n" | |
689 | "Maybe ok, but ipmi might run very slowly.\n", | |
690 | msg[2]); | |
1da177e4 | 691 | smi_info->si_state = SI_NORMAL; |
d9b7e4f7 CM |
692 | break; |
693 | } | |
95c97b59 | 694 | enables = current_global_enables(smi_info, 0, &irq_on); |
910840f2 | 695 | if (smi_info->io.si_type == SI_BT) |
95c97b59 CM |
696 | /* BT has its own interrupt enable bit. */ |
697 | check_bt_irq(smi_info, irq_on); | |
d9b7e4f7 CM |
698 | if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) { |
699 | /* Enables are not correct, fix them. */ | |
1da177e4 LT |
700 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); |
701 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
d9b7e4f7 | 702 | msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK); |
1da177e4 LT |
703 | smi_info->handlers->start_transaction( |
704 | smi_info->si_sm, msg, 3); | |
d9b7e4f7 CM |
705 | smi_info->si_state = SI_SETTING_ENABLES; |
706 | } else if (smi_info->supports_event_msg_buff) { | |
707 | smi_info->curr_msg = ipmi_alloc_smi_msg(); | |
708 | if (!smi_info->curr_msg) { | |
709 | smi_info->si_state = SI_NORMAL; | |
710 | break; | |
711 | } | |
5ac7b2fc | 712 | start_getting_events(smi_info); |
d9b7e4f7 CM |
713 | } else { |
714 | smi_info->si_state = SI_NORMAL; | |
1da177e4 LT |
715 | } |
716 | break; | |
717 | } | |
718 | ||
d9b7e4f7 | 719 | case SI_SETTING_ENABLES: |
1da177e4 LT |
720 | { |
721 | unsigned char msg[4]; | |
722 | ||
1da177e4 | 723 | smi_info->handlers->get_result(smi_info->si_sm, msg, 4); |
d9b7e4f7 | 724 | if (msg[2] != 0) |
ca8c1c53 | 725 | dev_warn_ratelimited(smi_info->io.dev, |
d9b7e4f7 CM |
726 | "Could not set the global enables: 0x%x.\n", |
727 | msg[2]); | |
728 | ||
729 | if (smi_info->supports_event_msg_buff) { | |
730 | smi_info->curr_msg = ipmi_alloc_smi_msg(); | |
731 | if (!smi_info->curr_msg) { | |
732 | smi_info->si_state = SI_NORMAL; | |
733 | break; | |
734 | } | |
5ac7b2fc | 735 | start_getting_events(smi_info); |
ee6cd5f8 | 736 | } else { |
d9b7e4f7 | 737 | smi_info->si_state = SI_NORMAL; |
ee6cd5f8 | 738 | } |
ee6cd5f8 CM |
739 | break; |
740 | } | |
1da177e4 LT |
741 | } |
742 | } | |
743 | ||
c305e3d3 CM |
744 | /* |
745 | * Called on timeouts and events. Timeouts should pass the elapsed | |
746 | * time, interrupts should pass in zero. Must be called with | |
747 | * si_lock held and interrupts disabled. | |
748 | */ | |
1da177e4 LT |
749 | static enum si_sm_result smi_event_handler(struct smi_info *smi_info, |
750 | int time) | |
751 | { | |
752 | enum si_sm_result si_sm_result; | |
753 | ||
76824852 | 754 | restart: |
c305e3d3 CM |
755 | /* |
756 | * There used to be a loop here that waited a little while | |
757 | * (around 25us) before giving up. That turned out to be | |
758 | * pointless, the minimum delays I was seeing were in the 300us | |
759 | * range, which is far too long to wait in an interrupt. So | |
760 | * we just run until the state machine tells us something | |
761 | * happened or it needs a delay. | |
762 | */ | |
1da177e4 LT |
763 | si_sm_result = smi_info->handlers->event(smi_info->si_sm, time); |
764 | time = 0; | |
765 | while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY) | |
1da177e4 | 766 | si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); |
1da177e4 | 767 | |
c305e3d3 | 768 | if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) { |
64959e2d | 769 | smi_inc_stat(smi_info, complete_transactions); |
1da177e4 LT |
770 | |
771 | handle_transaction_done(smi_info); | |
d9dffd2a | 772 | goto restart; |
c305e3d3 | 773 | } else if (si_sm_result == SI_SM_HOSED) { |
64959e2d | 774 | smi_inc_stat(smi_info, hosed_count); |
1da177e4 | 775 | |
c305e3d3 CM |
776 | /* |
777 | * Do the before return_hosed_msg, because that | |
778 | * releases the lock. | |
779 | */ | |
1da177e4 LT |
780 | smi_info->si_state = SI_NORMAL; |
781 | if (smi_info->curr_msg != NULL) { | |
c305e3d3 CM |
782 | /* |
783 | * If we were handling a user message, format | |
784 | * a response to send to the upper layer to | |
785 | * tell it about the error. | |
786 | */ | |
4d7cbac7 | 787 | return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED); |
1da177e4 | 788 | } |
d9dffd2a | 789 | goto restart; |
1da177e4 LT |
790 | } |
791 | ||
4ea18425 CM |
792 | /* |
793 | * We prefer handling attn over new messages. But don't do | |
794 | * this if there is not yet an upper layer to handle anything. | |
795 | */ | |
0fbecb4f | 796 | if (si_sm_result == SI_SM_ATTN || smi_info->got_attn) { |
1da177e4 LT |
797 | unsigned char msg[2]; |
798 | ||
a8df150c CM |
799 | if (smi_info->si_state != SI_NORMAL) { |
800 | /* | |
801 | * We got an ATTN, but we are doing something else. | |
802 | * Handle the ATTN later. | |
803 | */ | |
804 | smi_info->got_attn = true; | |
805 | } else { | |
806 | smi_info->got_attn = false; | |
807 | smi_inc_stat(smi_info, attentions); | |
1da177e4 | 808 | |
a8df150c CM |
809 | /* |
810 | * Got a attn, send down a get message flags to see | |
811 | * what's causing it. It would be better to handle | |
812 | * this in the upper layer, but due to the way | |
813 | * interrupts work with the SMI, that's not really | |
814 | * possible. | |
815 | */ | |
816 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
817 | msg[1] = IPMI_GET_MSG_FLAGS_CMD; | |
1da177e4 | 818 | |
0cfec916 | 819 | start_new_msg(smi_info, msg, 2); |
a8df150c CM |
820 | smi_info->si_state = SI_GETTING_FLAGS; |
821 | goto restart; | |
822 | } | |
1da177e4 LT |
823 | } |
824 | ||
825 | /* If we are currently idle, try to start the next message. */ | |
826 | if (si_sm_result == SI_SM_IDLE) { | |
64959e2d | 827 | smi_inc_stat(smi_info, idles); |
1da177e4 LT |
828 | |
829 | si_sm_result = start_next_msg(smi_info); | |
830 | if (si_sm_result != SI_SM_IDLE) | |
831 | goto restart; | |
c305e3d3 | 832 | } |
1da177e4 LT |
833 | |
834 | if ((si_sm_result == SI_SM_IDLE) | |
c305e3d3 CM |
835 | && (atomic_read(&smi_info->req_events))) { |
836 | /* | |
837 | * We are idle and the upper layer requested that I fetch | |
838 | * events, so do so. | |
839 | */ | |
55162fb1 | 840 | atomic_set(&smi_info->req_events, 0); |
1da177e4 | 841 | |
d9b7e4f7 CM |
842 | /* |
843 | * Take this opportunity to check the interrupt and | |
844 | * message enable state for the BMC. The BMC can be | |
845 | * asynchronously reset, and may thus get interrupts | |
846 | * disable and messages disabled. | |
847 | */ | |
910840f2 | 848 | if (smi_info->supports_event_msg_buff || smi_info->io.irq) { |
4f7f5551 | 849 | start_check_enables(smi_info); |
d9b7e4f7 CM |
850 | } else { |
851 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); | |
852 | if (!smi_info->curr_msg) | |
853 | goto out; | |
1da177e4 | 854 | |
d9b7e4f7 CM |
855 | start_getting_events(smi_info); |
856 | } | |
1da177e4 LT |
857 | goto restart; |
858 | } | |
314ef52f CM |
859 | |
860 | if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) { | |
861 | /* Ok it if fails, the timer will just go off. */ | |
862 | if (del_timer(&smi_info->si_timer)) | |
863 | smi_info->timer_running = false; | |
864 | } | |
865 | ||
76824852 | 866 | out: |
1da177e4 LT |
867 | return si_sm_result; |
868 | } | |
869 | ||
89986496 CM |
870 | static void check_start_timer_thread(struct smi_info *smi_info) |
871 | { | |
872 | if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) { | |
873 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
874 | ||
875 | if (smi_info->thread) | |
876 | wake_up_process(smi_info->thread); | |
877 | ||
878 | start_next_msg(smi_info); | |
879 | smi_event_handler(smi_info, 0); | |
880 | } | |
881 | } | |
882 | ||
82802f96 | 883 | static void flush_messages(void *send_info) |
e45361d7 | 884 | { |
82802f96 | 885 | struct smi_info *smi_info = send_info; |
e45361d7 HK |
886 | enum si_sm_result result; |
887 | ||
888 | /* | |
889 | * Currently, this function is called only in run-to-completion | |
890 | * mode. This means we are single-threaded, no need for locks. | |
891 | */ | |
892 | result = smi_event_handler(smi_info, 0); | |
893 | while (result != SI_SM_IDLE) { | |
894 | udelay(SI_SHORT_TIMEOUT_USEC); | |
895 | result = smi_event_handler(smi_info, SI_SHORT_TIMEOUT_USEC); | |
896 | } | |
897 | } | |
898 | ||
1da177e4 | 899 | static void sender(void *send_info, |
99ab32f3 | 900 | struct ipmi_smi_msg *msg) |
1da177e4 LT |
901 | { |
902 | struct smi_info *smi_info = send_info; | |
1da177e4 | 903 | unsigned long flags; |
1da177e4 | 904 | |
be850359 | 905 | debug_timestamp(smi_info, "Enqueue"); |
1da177e4 LT |
906 | |
907 | if (smi_info->run_to_completion) { | |
bda4c30a | 908 | /* |
82802f96 HK |
909 | * If we are running to completion, start it. Upper |
910 | * layer will call flush_messages to clear it out. | |
bda4c30a | 911 | */ |
9f812704 | 912 | smi_info->waiting_msg = msg; |
1da177e4 | 913 | return; |
1da177e4 | 914 | } |
1da177e4 | 915 | |
f60adf42 | 916 | spin_lock_irqsave(&smi_info->si_lock, flags); |
1d86e29b CM |
917 | /* |
918 | * The following two lines don't need to be under the lock for | |
919 | * the lock's sake, but they do need SMP memory barriers to | |
920 | * avoid getting things out of order. We are already claiming | |
921 | * the lock, anyway, so just do it under the lock to avoid the | |
922 | * ordering problem. | |
923 | */ | |
924 | BUG_ON(smi_info->waiting_msg); | |
925 | smi_info->waiting_msg = msg; | |
89986496 | 926 | check_start_timer_thread(smi_info); |
bda4c30a | 927 | spin_unlock_irqrestore(&smi_info->si_lock, flags); |
1da177e4 LT |
928 | } |
929 | ||
7aefac26 | 930 | static void set_run_to_completion(void *send_info, bool i_run_to_completion) |
1da177e4 LT |
931 | { |
932 | struct smi_info *smi_info = send_info; | |
1da177e4 LT |
933 | |
934 | smi_info->run_to_completion = i_run_to_completion; | |
e45361d7 HK |
935 | if (i_run_to_completion) |
936 | flush_messages(smi_info); | |
1da177e4 LT |
937 | } |
938 | ||
ae74e823 | 939 | /* |
8d73b2ae AB |
940 | * Use -1 as a special constant to tell that we are spinning in kipmid |
941 | * looking for something and not delaying between checks | |
ae74e823 | 942 | */ |
8d73b2ae | 943 | #define IPMI_TIME_NOT_BUSY ns_to_ktime(-1ull) |
cbb19cb1 CM |
944 | static inline bool ipmi_thread_busy_wait(enum si_sm_result smi_result, |
945 | const struct smi_info *smi_info, | |
8d73b2ae | 946 | ktime_t *busy_until) |
ae74e823 MW |
947 | { |
948 | unsigned int max_busy_us = 0; | |
949 | ||
57bccb4e CM |
950 | if (smi_info->si_num < num_max_busy_us) |
951 | max_busy_us = kipmid_max_busy_us[smi_info->si_num]; | |
ae74e823 | 952 | if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY) |
8d73b2ae AB |
953 | *busy_until = IPMI_TIME_NOT_BUSY; |
954 | else if (*busy_until == IPMI_TIME_NOT_BUSY) { | |
955 | *busy_until = ktime_get() + max_busy_us * NSEC_PER_USEC; | |
ae74e823 | 956 | } else { |
8d73b2ae AB |
957 | if (unlikely(ktime_get() > *busy_until)) { |
958 | *busy_until = IPMI_TIME_NOT_BUSY; | |
cbb19cb1 | 959 | return false; |
ae74e823 MW |
960 | } |
961 | } | |
cbb19cb1 | 962 | return true; |
ae74e823 MW |
963 | } |
964 | ||
965 | ||
966 | /* | |
967 | * A busy-waiting loop for speeding up IPMI operation. | |
968 | * | |
969 | * Lousy hardware makes this hard. This is only enabled for systems | |
970 | * that are not BT and do not have interrupts. It starts spinning | |
971 | * when an operation is complete or until max_busy tells it to stop | |
972 | * (if that is enabled). See the paragraph on kimid_max_busy_us in | |
283b69bf | 973 | * Documentation/driver-api/ipmi.rst for details. |
ae74e823 | 974 | */ |
a9a2c44f CM |
975 | static int ipmi_thread(void *data) |
976 | { | |
977 | struct smi_info *smi_info = data; | |
e9a705a0 | 978 | unsigned long flags; |
a9a2c44f | 979 | enum si_sm_result smi_result; |
8d73b2ae | 980 | ktime_t busy_until = IPMI_TIME_NOT_BUSY; |
a9a2c44f | 981 | |
8698a745 | 982 | set_user_nice(current, MAX_NICE); |
e9a705a0 | 983 | while (!kthread_should_stop()) { |
ae74e823 MW |
984 | int busy_wait; |
985 | ||
a9a2c44f | 986 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
8a3628d5 | 987 | smi_result = smi_event_handler(smi_info, 0); |
48e8ac29 BS |
988 | |
989 | /* | |
990 | * If the driver is doing something, there is a possible | |
991 | * race with the timer. If the timer handler see idle, | |
992 | * and the thread here sees something else, the timer | |
993 | * handler won't restart the timer even though it is | |
994 | * required. So start it here if necessary. | |
995 | */ | |
996 | if (smi_result != SI_SM_IDLE && !smi_info->timer_running) | |
997 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
998 | ||
a9a2c44f | 999 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
ae74e823 MW |
1000 | busy_wait = ipmi_thread_busy_wait(smi_result, smi_info, |
1001 | &busy_until); | |
340ff31a | 1002 | if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { |
c305e3d3 | 1003 | ; /* do nothing */ |
340ff31a CM |
1004 | } else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait) { |
1005 | /* | |
1006 | * In maintenance mode we run as fast as | |
1007 | * possible to allow firmware updates to | |
1008 | * complete as fast as possible, but normally | |
1009 | * don't bang on the scheduler. | |
1010 | */ | |
1011 | if (smi_info->in_maintenance_mode) | |
1012 | schedule(); | |
1013 | else | |
1014 | usleep_range(100, 200); | |
1015 | } else if (smi_result == SI_SM_IDLE) { | |
89986496 CM |
1016 | if (atomic_read(&smi_info->need_watch)) { |
1017 | schedule_timeout_interruptible(100); | |
1018 | } else { | |
1019 | /* Wait to be woken up when we are needed. */ | |
1020 | __set_current_state(TASK_INTERRUPTIBLE); | |
1021 | schedule(); | |
1022 | } | |
340ff31a | 1023 | } else { |
8d1f66dc | 1024 | schedule_timeout_interruptible(1); |
340ff31a | 1025 | } |
a9a2c44f | 1026 | } |
a9a2c44f CM |
1027 | return 0; |
1028 | } | |
1029 | ||
1030 | ||
1da177e4 LT |
1031 | static void poll(void *send_info) |
1032 | { | |
1033 | struct smi_info *smi_info = send_info; | |
f60adf42 | 1034 | unsigned long flags = 0; |
7aefac26 | 1035 | bool run_to_completion = smi_info->run_to_completion; |
1da177e4 | 1036 | |
15c62e10 CM |
1037 | /* |
1038 | * Make sure there is some delay in the poll loop so we can | |
1039 | * drive time forward and timeout things. | |
1040 | */ | |
1041 | udelay(10); | |
f60adf42 CM |
1042 | if (!run_to_completion) |
1043 | spin_lock_irqsave(&smi_info->si_lock, flags); | |
15c62e10 | 1044 | smi_event_handler(smi_info, 10); |
f60adf42 CM |
1045 | if (!run_to_completion) |
1046 | spin_unlock_irqrestore(&smi_info->si_lock, flags); | |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | static void request_events(void *send_info) | |
1050 | { | |
1051 | struct smi_info *smi_info = send_info; | |
1052 | ||
b874b985 | 1053 | if (!smi_info->has_event_buffer) |
b361e27b CM |
1054 | return; |
1055 | ||
1da177e4 LT |
1056 | atomic_set(&smi_info->req_events, 1); |
1057 | } | |
1058 | ||
c65ea996 | 1059 | static void set_need_watch(void *send_info, unsigned int watch_mask) |
89986496 CM |
1060 | { |
1061 | struct smi_info *smi_info = send_info; | |
1062 | unsigned long flags; | |
c65ea996 CM |
1063 | int enable; |
1064 | ||
e1891cff | 1065 | enable = !!watch_mask; |
89986496 CM |
1066 | |
1067 | atomic_set(&smi_info->need_watch, enable); | |
1068 | spin_lock_irqsave(&smi_info->si_lock, flags); | |
1069 | check_start_timer_thread(smi_info); | |
1070 | spin_unlock_irqrestore(&smi_info->si_lock, flags); | |
1071 | } | |
1072 | ||
e99e88a9 | 1073 | static void smi_timeout(struct timer_list *t) |
1da177e4 | 1074 | { |
e99e88a9 | 1075 | struct smi_info *smi_info = from_timer(smi_info, t, si_timer); |
1da177e4 LT |
1076 | enum si_sm_result smi_result; |
1077 | unsigned long flags; | |
1078 | unsigned long jiffies_now; | |
c4edff1c | 1079 | long time_diff; |
3326f4f2 | 1080 | long timeout; |
1da177e4 | 1081 | |
1da177e4 | 1082 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
be850359 | 1083 | debug_timestamp(smi_info, "Timer"); |
f93aae9f | 1084 | |
1da177e4 | 1085 | jiffies_now = jiffies; |
c4edff1c | 1086 | time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies) |
1da177e4 LT |
1087 | * SI_USEC_PER_JIFFY); |
1088 | smi_result = smi_event_handler(smi_info, time_diff); | |
1089 | ||
910840f2 | 1090 | if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
1da177e4 | 1091 | /* Running with interrupts, only do long timeouts. */ |
3326f4f2 | 1092 | timeout = jiffies + SI_TIMEOUT_JIFFIES; |
64959e2d | 1093 | smi_inc_stat(smi_info, long_timeouts); |
3326f4f2 | 1094 | goto do_mod_timer; |
1da177e4 LT |
1095 | } |
1096 | ||
c305e3d3 CM |
1097 | /* |
1098 | * If the state machine asks for a short delay, then shorten | |
1099 | * the timer timeout. | |
1100 | */ | |
1da177e4 | 1101 | if (smi_result == SI_SM_CALL_WITH_DELAY) { |
64959e2d | 1102 | smi_inc_stat(smi_info, short_timeouts); |
3326f4f2 | 1103 | timeout = jiffies + 1; |
1da177e4 | 1104 | } else { |
64959e2d | 1105 | smi_inc_stat(smi_info, long_timeouts); |
3326f4f2 | 1106 | timeout = jiffies + SI_TIMEOUT_JIFFIES; |
1da177e4 LT |
1107 | } |
1108 | ||
76824852 | 1109 | do_mod_timer: |
3326f4f2 | 1110 | if (smi_result != SI_SM_IDLE) |
48e8ac29 BS |
1111 | smi_mod_timer(smi_info, timeout); |
1112 | else | |
1113 | smi_info->timer_running = false; | |
1114 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); | |
1da177e4 LT |
1115 | } |
1116 | ||
4f3e8199 | 1117 | irqreturn_t ipmi_si_irq_handler(int irq, void *data) |
1da177e4 LT |
1118 | { |
1119 | struct smi_info *smi_info = data; | |
1120 | unsigned long flags; | |
1da177e4 | 1121 | |
4f3e8199 CM |
1122 | if (smi_info->io.si_type == SI_BT) |
1123 | /* We need to clear the IRQ flag for the BT interface. */ | |
1124 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, | |
1125 | IPMI_BT_INTMASK_CLEAR_IRQ_BIT | |
1126 | | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
1127 | ||
1da177e4 LT |
1128 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
1129 | ||
64959e2d | 1130 | smi_inc_stat(smi_info, interrupts); |
1da177e4 | 1131 | |
be850359 | 1132 | debug_timestamp(smi_info, "Interrupt"); |
f93aae9f | 1133 | |
1da177e4 | 1134 | smi_event_handler(smi_info, 0); |
1da177e4 LT |
1135 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
1136 | return IRQ_HANDLED; | |
1137 | } | |
1138 | ||
a567b623 CM |
1139 | static int smi_start_processing(void *send_info, |
1140 | struct ipmi_smi *intf) | |
453823ba CM |
1141 | { |
1142 | struct smi_info *new_smi = send_info; | |
a51f4a81 | 1143 | int enable = 0; |
453823ba CM |
1144 | |
1145 | new_smi->intf = intf; | |
1146 | ||
1147 | /* Set up the timer that drives the interface. */ | |
e99e88a9 | 1148 | timer_setup(&new_smi->si_timer, smi_timeout, 0); |
4f7f5551 | 1149 | new_smi->timer_can_start = true; |
48e8ac29 | 1150 | smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES); |
453823ba | 1151 | |
27f972d3 | 1152 | /* Try to claim any interrupts. */ |
4f3e8199 CM |
1153 | if (new_smi->io.irq_setup) { |
1154 | new_smi->io.irq_handler_data = new_smi; | |
1155 | new_smi->io.irq_setup(&new_smi->io); | |
1156 | } | |
27f972d3 | 1157 | |
a51f4a81 CM |
1158 | /* |
1159 | * Check if the user forcefully enabled the daemon. | |
1160 | */ | |
57bccb4e CM |
1161 | if (new_smi->si_num < num_force_kipmid) |
1162 | enable = force_kipmid[new_smi->si_num]; | |
df3fe8de CM |
1163 | /* |
1164 | * The BT interface is efficient enough to not need a thread, | |
1165 | * and there is no need for a thread if we have interrupts. | |
1166 | */ | |
910840f2 | 1167 | else if ((new_smi->io.si_type != SI_BT) && (!new_smi->io.irq)) |
a51f4a81 CM |
1168 | enable = 1; |
1169 | ||
1170 | if (enable) { | |
453823ba | 1171 | new_smi->thread = kthread_run(ipmi_thread, new_smi, |
57bccb4e | 1172 | "kipmi%d", new_smi->si_num); |
453823ba | 1173 | if (IS_ERR(new_smi->thread)) { |
07cbd87b AS |
1174 | dev_notice(new_smi->io.dev, |
1175 | "Could not start kernel thread due to error %ld, only using timers to drive the interface\n", | |
279fbd0c | 1176 | PTR_ERR(new_smi->thread)); |
453823ba CM |
1177 | new_smi->thread = NULL; |
1178 | } | |
1179 | } | |
1180 | ||
1181 | return 0; | |
1182 | } | |
9dbf68f9 | 1183 | |
16f4232c ZY |
1184 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) |
1185 | { | |
1186 | struct smi_info *smi = send_info; | |
1187 | ||
910840f2 CM |
1188 | data->addr_src = smi->io.addr_source; |
1189 | data->dev = smi->io.dev; | |
bb398a4c | 1190 | data->addr_info = smi->io.addr_info; |
910840f2 | 1191 | get_device(smi->io.dev); |
16f4232c ZY |
1192 | |
1193 | return 0; | |
1194 | } | |
1195 | ||
7aefac26 | 1196 | static void set_maintenance_mode(void *send_info, bool enable) |
b9675136 CM |
1197 | { |
1198 | struct smi_info *smi_info = send_info; | |
1199 | ||
1200 | if (!enable) | |
1201 | atomic_set(&smi_info->req_events, 0); | |
340ff31a | 1202 | smi_info->in_maintenance_mode = enable; |
b9675136 CM |
1203 | } |
1204 | ||
7960f18a | 1205 | static void shutdown_smi(void *send_info); |
81d02b7f | 1206 | static const struct ipmi_smi_handlers handlers = { |
1da177e4 | 1207 | .owner = THIS_MODULE, |
453823ba | 1208 | .start_processing = smi_start_processing, |
7960f18a | 1209 | .shutdown = shutdown_smi, |
16f4232c | 1210 | .get_smi_info = get_smi_info, |
1da177e4 LT |
1211 | .sender = sender, |
1212 | .request_events = request_events, | |
89986496 | 1213 | .set_need_watch = set_need_watch, |
b9675136 | 1214 | .set_maintenance_mode = set_maintenance_mode, |
1da177e4 | 1215 | .set_run_to_completion = set_run_to_completion, |
82802f96 | 1216 | .flush_messages = flush_messages, |
1da177e4 LT |
1217 | .poll = poll, |
1218 | }; | |
1219 | ||
b0defcdb | 1220 | static LIST_HEAD(smi_infos); |
d6dfd131 | 1221 | static DEFINE_MUTEX(smi_infos_lock); |
b0defcdb | 1222 | static int smi_num; /* Used to sequence the SMIs */ |
1da177e4 | 1223 | |
99ee6735 | 1224 | static const char * const addr_space_to_str[] = { "i/o", "mem" }; |
b361e27b | 1225 | |
a51f4a81 | 1226 | module_param_array(force_kipmid, int, &num_force_kipmid, 0); |
07cbd87b AS |
1227 | MODULE_PARM_DESC(force_kipmid, |
1228 | "Force the kipmi daemon to be enabled (1) or disabled(0). Normally the IPMI driver auto-detects this, but the value may be overridden by this parm."); | |
7aefac26 | 1229 | module_param(unload_when_empty, bool, 0); |
07cbd87b AS |
1230 | MODULE_PARM_DESC(unload_when_empty, |
1231 | "Unload the module if no interfaces are specified or found, default is 1. Setting to 0 is useful for hot add of devices using hotmod."); | |
ae74e823 MW |
1232 | module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644); |
1233 | MODULE_PARM_DESC(kipmid_max_busy_us, | |
07cbd87b | 1234 | "Max time (in microseconds) to busy-wait for IPMI data before sleeping. 0 (default) means to wait forever. Set to 100-500 if kipmid is using up a lot of CPU time."); |
1da177e4 | 1235 | |
4f3e8199 CM |
1236 | void ipmi_irq_finish_setup(struct si_sm_io *io) |
1237 | { | |
1238 | if (io->si_type == SI_BT) | |
1239 | /* Enable the interrupt in the BT interface. */ | |
1240 | io->outputb(io, IPMI_BT_INTMASK_REG, | |
1241 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
1242 | } | |
1da177e4 | 1243 | |
4f3e8199 | 1244 | void ipmi_irq_start_cleanup(struct si_sm_io *io) |
1da177e4 | 1245 | { |
4f3e8199 | 1246 | if (io->si_type == SI_BT) |
b0defcdb | 1247 | /* Disable the interrupt in the BT interface. */ |
4f3e8199 CM |
1248 | io->outputb(io, IPMI_BT_INTMASK_REG, 0); |
1249 | } | |
1250 | ||
1251 | static void std_irq_cleanup(struct si_sm_io *io) | |
1252 | { | |
1253 | ipmi_irq_start_cleanup(io); | |
1254 | free_irq(io->irq, io->irq_handler_data); | |
1da177e4 | 1255 | } |
1da177e4 | 1256 | |
4f3e8199 | 1257 | int ipmi_std_irq_setup(struct si_sm_io *io) |
1da177e4 LT |
1258 | { |
1259 | int rv; | |
1260 | ||
4f3e8199 | 1261 | if (!io->irq) |
1da177e4 LT |
1262 | return 0; |
1263 | ||
4f3e8199 CM |
1264 | rv = request_irq(io->irq, |
1265 | ipmi_si_irq_handler, | |
1266 | IRQF_SHARED, | |
104fb25f | 1267 | SI_DEVICE_NAME, |
4f3e8199 | 1268 | io->irq_handler_data); |
1da177e4 | 1269 | if (rv) { |
07cbd87b | 1270 | dev_warn(io->dev, "%s unable to claim interrupt %d, running polled\n", |
104fb25f | 1271 | SI_DEVICE_NAME, io->irq); |
4f3e8199 | 1272 | io->irq = 0; |
1da177e4 | 1273 | } else { |
4f3e8199 CM |
1274 | io->irq_cleanup = std_irq_cleanup; |
1275 | ipmi_irq_finish_setup(io); | |
1276 | dev_info(io->dev, "Using irq %d\n", io->irq); | |
1da177e4 LT |
1277 | } |
1278 | ||
1279 | return rv; | |
1280 | } | |
1281 | ||
40112ae7 | 1282 | static int wait_for_msg_done(struct smi_info *smi_info) |
1da177e4 | 1283 | { |
50c812b2 | 1284 | enum si_sm_result smi_result; |
1da177e4 LT |
1285 | |
1286 | smi_result = smi_info->handlers->event(smi_info->si_sm, 0); | |
c305e3d3 | 1287 | for (;;) { |
c3e7e791 CM |
1288 | if (smi_result == SI_SM_CALL_WITH_DELAY || |
1289 | smi_result == SI_SM_CALL_WITH_TICK_DELAY) { | |
da4cd8df | 1290 | schedule_timeout_uninterruptible(1); |
1da177e4 | 1291 | smi_result = smi_info->handlers->event( |
e21404dc | 1292 | smi_info->si_sm, jiffies_to_usecs(1)); |
c305e3d3 | 1293 | } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { |
1da177e4 LT |
1294 | smi_result = smi_info->handlers->event( |
1295 | smi_info->si_sm, 0); | |
c305e3d3 | 1296 | } else |
1da177e4 LT |
1297 | break; |
1298 | } | |
40112ae7 | 1299 | if (smi_result == SI_SM_HOSED) |
c305e3d3 CM |
1300 | /* |
1301 | * We couldn't get the state machine to run, so whatever's at | |
1302 | * the port is probably not an IPMI SMI interface. | |
1303 | */ | |
40112ae7 CM |
1304 | return -ENODEV; |
1305 | ||
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | static int try_get_dev_id(struct smi_info *smi_info) | |
1310 | { | |
1311 | unsigned char msg[2]; | |
1312 | unsigned char *resp; | |
1313 | unsigned long resp_len; | |
1314 | int rv = 0; | |
42d8a346 | 1315 | unsigned int retry_count = 0; |
40112ae7 CM |
1316 | |
1317 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1318 | if (!resp) | |
1319 | return -ENOMEM; | |
1320 | ||
1321 | /* | |
1322 | * Do a Get Device ID command, since it comes back with some | |
1323 | * useful info. | |
1324 | */ | |
1325 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1326 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
42d8a346 XT |
1327 | |
1328 | retry: | |
40112ae7 CM |
1329 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); |
1330 | ||
1331 | rv = wait_for_msg_done(smi_info); | |
1332 | if (rv) | |
1da177e4 | 1333 | goto out; |
1da177e4 | 1334 | |
1da177e4 LT |
1335 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
1336 | resp, IPMI_MAX_MSG_LENGTH); | |
1da177e4 | 1337 | |
d8c98618 | 1338 | /* Check and record info from the get device id, in case we need it. */ |
c468f911 JK |
1339 | rv = ipmi_demangle_device_id(resp[0] >> 2, resp[1], |
1340 | resp + 2, resp_len - 2, &smi_info->device_id); | |
42d8a346 XT |
1341 | if (rv) { |
1342 | /* record completion code */ | |
c011410d | 1343 | unsigned char cc = *(resp + 2); |
42d8a346 | 1344 | |
c6ddd5f1 TD |
1345 | if (cc != IPMI_CC_NO_ERROR && |
1346 | ++retry_count <= GET_DEVICE_ID_MAX_RETRY) { | |
ca8c1c53 | 1347 | dev_warn_ratelimited(smi_info->io.dev, |
42d8a346 XT |
1348 | "BMC returned 0x%2.2x, retry get bmc device id\n", |
1349 | cc); | |
1350 | goto retry; | |
1351 | } | |
1352 | } | |
1da177e4 | 1353 | |
76824852 | 1354 | out: |
1da177e4 LT |
1355 | kfree(resp); |
1356 | return rv; | |
1357 | } | |
1358 | ||
d0882897 | 1359 | static int get_global_enables(struct smi_info *smi_info, u8 *enables) |
1e7d6a45 CM |
1360 | { |
1361 | unsigned char msg[3]; | |
1362 | unsigned char *resp; | |
1363 | unsigned long resp_len; | |
1364 | int rv; | |
1365 | ||
1366 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
d0882897 CM |
1367 | if (!resp) |
1368 | return -ENOMEM; | |
1e7d6a45 CM |
1369 | |
1370 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1371 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1372 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1373 | ||
1374 | rv = wait_for_msg_done(smi_info); | |
1375 | if (rv) { | |
910840f2 | 1376 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1377 | "Error getting response from get global enables command: %d\n", |
1378 | rv); | |
1e7d6a45 CM |
1379 | goto out; |
1380 | } | |
1381 | ||
1382 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1383 | resp, IPMI_MAX_MSG_LENGTH); | |
1384 | ||
1385 | if (resp_len < 4 || | |
1386 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1387 | resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || | |
1388 | resp[2] != 0) { | |
910840f2 | 1389 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1390 | "Invalid return from get global enables command: %ld %x %x %x\n", |
1391 | resp_len, resp[0], resp[1], resp[2]); | |
1e7d6a45 CM |
1392 | rv = -EINVAL; |
1393 | goto out; | |
d0882897 CM |
1394 | } else { |
1395 | *enables = resp[3]; | |
1e7d6a45 CM |
1396 | } |
1397 | ||
d0882897 CM |
1398 | out: |
1399 | kfree(resp); | |
1400 | return rv; | |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * Returns 1 if it gets an error from the command. | |
1405 | */ | |
1406 | static int set_global_enables(struct smi_info *smi_info, u8 enables) | |
1407 | { | |
1408 | unsigned char msg[3]; | |
1409 | unsigned char *resp; | |
1410 | unsigned long resp_len; | |
1411 | int rv; | |
1412 | ||
1413 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1414 | if (!resp) | |
1415 | return -ENOMEM; | |
1e7d6a45 CM |
1416 | |
1417 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1418 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
d0882897 | 1419 | msg[2] = enables; |
1e7d6a45 CM |
1420 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); |
1421 | ||
1422 | rv = wait_for_msg_done(smi_info); | |
1423 | if (rv) { | |
910840f2 | 1424 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1425 | "Error getting response from set global enables command: %d\n", |
1426 | rv); | |
1e7d6a45 CM |
1427 | goto out; |
1428 | } | |
1429 | ||
1430 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1431 | resp, IPMI_MAX_MSG_LENGTH); | |
1432 | ||
1433 | if (resp_len < 3 || | |
1434 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1435 | resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { | |
910840f2 | 1436 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1437 | "Invalid return from set global enables command: %ld %x %x\n", |
1438 | resp_len, resp[0], resp[1]); | |
1e7d6a45 CM |
1439 | rv = -EINVAL; |
1440 | goto out; | |
1441 | } | |
1442 | ||
d0882897 CM |
1443 | if (resp[2] != 0) |
1444 | rv = 1; | |
1445 | ||
1446 | out: | |
1447 | kfree(resp); | |
1448 | return rv; | |
1449 | } | |
1450 | ||
1451 | /* | |
1452 | * Some BMCs do not support clearing the receive irq bit in the global | |
1453 | * enables (even if they don't support interrupts on the BMC). Check | |
1454 | * for this and handle it properly. | |
1455 | */ | |
1456 | static void check_clr_rcv_irq(struct smi_info *smi_info) | |
1457 | { | |
1458 | u8 enables = 0; | |
1459 | int rv; | |
1460 | ||
1461 | rv = get_global_enables(smi_info, &enables); | |
1462 | if (!rv) { | |
1463 | if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0) | |
1464 | /* Already clear, should work ok. */ | |
1465 | return; | |
1466 | ||
1467 | enables &= ~IPMI_BMC_RCV_MSG_INTR; | |
1468 | rv = set_global_enables(smi_info, enables); | |
1469 | } | |
1470 | ||
1471 | if (rv < 0) { | |
910840f2 | 1472 | dev_err(smi_info->io.dev, |
d0882897 CM |
1473 | "Cannot check clearing the rcv irq: %d\n", rv); |
1474 | return; | |
1475 | } | |
1476 | ||
1477 | if (rv) { | |
1e7d6a45 CM |
1478 | /* |
1479 | * An error when setting the event buffer bit means | |
1480 | * clearing the bit is not supported. | |
1481 | */ | |
910840f2 | 1482 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1483 | "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
1484 | smi_info->cannot_disable_irq = true; | |
1485 | } | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Some BMCs do not support setting the interrupt bits in the global | |
1490 | * enables even if they support interrupts. Clearly bad, but we can | |
1491 | * compensate. | |
1492 | */ | |
1493 | static void check_set_rcv_irq(struct smi_info *smi_info) | |
1494 | { | |
1495 | u8 enables = 0; | |
1496 | int rv; | |
1497 | ||
910840f2 | 1498 | if (!smi_info->io.irq) |
d0882897 CM |
1499 | return; |
1500 | ||
1501 | rv = get_global_enables(smi_info, &enables); | |
1502 | if (!rv) { | |
1503 | enables |= IPMI_BMC_RCV_MSG_INTR; | |
1504 | rv = set_global_enables(smi_info, enables); | |
1505 | } | |
1506 | ||
1507 | if (rv < 0) { | |
910840f2 | 1508 | dev_err(smi_info->io.dev, |
d0882897 CM |
1509 | "Cannot check setting the rcv irq: %d\n", rv); |
1510 | return; | |
1511 | } | |
1512 | ||
1513 | if (rv) { | |
1514 | /* | |
1515 | * An error when setting the event buffer bit means | |
1516 | * setting the bit is not supported. | |
1517 | */ | |
910840f2 | 1518 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1519 | "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
1520 | smi_info->cannot_disable_irq = true; | |
1521 | smi_info->irq_enable_broken = true; | |
1e7d6a45 | 1522 | } |
1e7d6a45 CM |
1523 | } |
1524 | ||
40112ae7 CM |
1525 | static int try_enable_event_buffer(struct smi_info *smi_info) |
1526 | { | |
1527 | unsigned char msg[3]; | |
1528 | unsigned char *resp; | |
1529 | unsigned long resp_len; | |
1530 | int rv = 0; | |
1531 | ||
1532 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1533 | if (!resp) | |
1534 | return -ENOMEM; | |
1535 | ||
1536 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1537 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1538 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1539 | ||
1540 | rv = wait_for_msg_done(smi_info); | |
1541 | if (rv) { | |
25880f7d | 1542 | pr_warn("Error getting response from get global enables command, the event buffer is not enabled\n"); |
40112ae7 CM |
1543 | goto out; |
1544 | } | |
1545 | ||
1546 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1547 | resp, IPMI_MAX_MSG_LENGTH); | |
1548 | ||
1549 | if (resp_len < 4 || | |
1550 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1551 | resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || | |
1552 | resp[2] != 0) { | |
25880f7d | 1553 | pr_warn("Invalid return from get global enables command, cannot enable the event buffer\n"); |
40112ae7 CM |
1554 | rv = -EINVAL; |
1555 | goto out; | |
1556 | } | |
1557 | ||
d9b7e4f7 | 1558 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
40112ae7 | 1559 | /* buffer is already enabled, nothing to do. */ |
d9b7e4f7 | 1560 | smi_info->supports_event_msg_buff = true; |
40112ae7 | 1561 | goto out; |
d9b7e4f7 | 1562 | } |
40112ae7 CM |
1563 | |
1564 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1565 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1566 | msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF; | |
1567 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); | |
1568 | ||
1569 | rv = wait_for_msg_done(smi_info); | |
1570 | if (rv) { | |
25880f7d | 1571 | pr_warn("Error getting response from set global, enables command, the event buffer is not enabled\n"); |
40112ae7 CM |
1572 | goto out; |
1573 | } | |
1574 | ||
1575 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1576 | resp, IPMI_MAX_MSG_LENGTH); | |
1577 | ||
1578 | if (resp_len < 3 || | |
1579 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1580 | resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { | |
25880f7d | 1581 | pr_warn("Invalid return from get global, enables command, not enable the event buffer\n"); |
40112ae7 CM |
1582 | rv = -EINVAL; |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | if (resp[2] != 0) | |
1587 | /* | |
1588 | * An error when setting the event buffer bit means | |
1589 | * that the event buffer is not supported. | |
1590 | */ | |
1591 | rv = -ENOENT; | |
d9b7e4f7 CM |
1592 | else |
1593 | smi_info->supports_event_msg_buff = true; | |
1594 | ||
76824852 | 1595 | out: |
40112ae7 CM |
1596 | kfree(resp); |
1597 | return rv; | |
1598 | } | |
1599 | ||
3dd377b5 | 1600 | #define IPMI_SI_ATTR(name) \ |
93b6984b CM |
1601 | static ssize_t name##_show(struct device *dev, \ |
1602 | struct device_attribute *attr, \ | |
1603 | char *buf) \ | |
3dd377b5 CM |
1604 | { \ |
1605 | struct smi_info *smi_info = dev_get_drvdata(dev); \ | |
1606 | \ | |
fc4e7848 | 1607 | return sysfs_emit(buf, "%u\n", smi_get_stat(smi_info, name)); \ |
3dd377b5 | 1608 | } \ |
bf064c7b | 1609 | static DEVICE_ATTR_RO(name) |
3dd377b5 | 1610 | |
93b6984b CM |
1611 | static ssize_t type_show(struct device *dev, |
1612 | struct device_attribute *attr, | |
1613 | char *buf) | |
3dd377b5 CM |
1614 | { |
1615 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1616 | ||
fc4e7848 | 1617 | return sysfs_emit(buf, "%s\n", si_to_str[smi_info->io.si_type]); |
3dd377b5 | 1618 | } |
bf064c7b | 1619 | static DEVICE_ATTR_RO(type); |
3dd377b5 | 1620 | |
93b6984b CM |
1621 | static ssize_t interrupts_enabled_show(struct device *dev, |
1622 | struct device_attribute *attr, | |
1623 | char *buf) | |
3dd377b5 CM |
1624 | { |
1625 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1626 | int enabled = smi_info->io.irq && !smi_info->interrupt_disabled; | |
1627 | ||
fc4e7848 | 1628 | return sysfs_emit(buf, "%d\n", enabled); |
3dd377b5 | 1629 | } |
bf064c7b | 1630 | static DEVICE_ATTR_RO(interrupts_enabled); |
3dd377b5 CM |
1631 | |
1632 | IPMI_SI_ATTR(short_timeouts); | |
1633 | IPMI_SI_ATTR(long_timeouts); | |
1634 | IPMI_SI_ATTR(idles); | |
1635 | IPMI_SI_ATTR(interrupts); | |
1636 | IPMI_SI_ATTR(attentions); | |
1637 | IPMI_SI_ATTR(flag_fetches); | |
1638 | IPMI_SI_ATTR(hosed_count); | |
1639 | IPMI_SI_ATTR(complete_transactions); | |
1640 | IPMI_SI_ATTR(events); | |
1641 | IPMI_SI_ATTR(watchdog_pretimeouts); | |
1642 | IPMI_SI_ATTR(incoming_messages); | |
1643 | ||
93b6984b CM |
1644 | static ssize_t params_show(struct device *dev, |
1645 | struct device_attribute *attr, | |
1646 | char *buf) | |
3dd377b5 CM |
1647 | { |
1648 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1649 | ||
fc4e7848 | 1650 | return sysfs_emit(buf, |
3dd377b5 CM |
1651 | "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n", |
1652 | si_to_str[smi_info->io.si_type], | |
f6296bdc | 1653 | addr_space_to_str[smi_info->io.addr_space], |
3dd377b5 CM |
1654 | smi_info->io.addr_data, |
1655 | smi_info->io.regspacing, | |
1656 | smi_info->io.regsize, | |
1657 | smi_info->io.regshift, | |
1658 | smi_info->io.irq, | |
1659 | smi_info->io.slave_addr); | |
1660 | } | |
bf064c7b | 1661 | static DEVICE_ATTR_RO(params); |
3dd377b5 CM |
1662 | |
1663 | static struct attribute *ipmi_si_dev_attrs[] = { | |
1664 | &dev_attr_type.attr, | |
1665 | &dev_attr_interrupts_enabled.attr, | |
1666 | &dev_attr_short_timeouts.attr, | |
1667 | &dev_attr_long_timeouts.attr, | |
1668 | &dev_attr_idles.attr, | |
1669 | &dev_attr_interrupts.attr, | |
1670 | &dev_attr_attentions.attr, | |
1671 | &dev_attr_flag_fetches.attr, | |
1672 | &dev_attr_hosed_count.attr, | |
1673 | &dev_attr_complete_transactions.attr, | |
1674 | &dev_attr_events.attr, | |
1675 | &dev_attr_watchdog_pretimeouts.attr, | |
1676 | &dev_attr_incoming_messages.attr, | |
1677 | &dev_attr_params.attr, | |
1678 | NULL | |
1679 | }; | |
1680 | ||
1681 | static const struct attribute_group ipmi_si_dev_attr_group = { | |
1682 | .attrs = ipmi_si_dev_attrs, | |
1683 | }; | |
1684 | ||
3ae0e0f9 CM |
1685 | /* |
1686 | * oem_data_avail_to_receive_msg_avail | |
1687 | * @info - smi_info structure with msg_flags set | |
1688 | * | |
1689 | * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL | |
1690 | * Returns 1 indicating need to re-run handle_flags(). | |
1691 | */ | |
1692 | static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info) | |
1693 | { | |
e8b33617 | 1694 | smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) | |
c305e3d3 | 1695 | RECEIVE_MSG_AVAIL); |
3ae0e0f9 CM |
1696 | return 1; |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | * setup_dell_poweredge_oem_data_handler | |
1701 | * @info - smi_info.device_id must be populated | |
1702 | * | |
1703 | * Systems that match, but have firmware version < 1.40 may assert | |
1704 | * OEM0_DATA_AVAIL on their own, without being told via Set Flags that | |
1705 | * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL | |
1706 | * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags | |
1707 | * as RECEIVE_MSG_AVAIL instead. | |
1708 | * | |
1709 | * As Dell has no plans to release IPMI 1.5 firmware that *ever* | |
1710 | * assert the OEM[012] bits, and if it did, the driver would have to | |
1711 | * change to handle that properly, we don't actually check for the | |
1712 | * firmware version. | |
1713 | * Device ID = 0x20 BMC on PowerEdge 8G servers | |
1714 | * Device Revision = 0x80 | |
1715 | * Firmware Revision1 = 0x01 BMC version 1.40 | |
1716 | * Firmware Revision2 = 0x40 BCD encoded | |
1717 | * IPMI Version = 0x51 IPMI 1.5 | |
1718 | * Manufacturer ID = A2 02 00 Dell IANA | |
1719 | * | |
d5a2b89a CM |
1720 | * Additionally, PowerEdge systems with IPMI < 1.5 may also assert |
1721 | * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL. | |
1722 | * | |
3ae0e0f9 CM |
1723 | */ |
1724 | #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20 | |
1725 | #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80 | |
1726 | #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51 | |
50c812b2 | 1727 | #define DELL_IANA_MFR_ID 0x0002a2 |
3ae0e0f9 CM |
1728 | static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info) |
1729 | { | |
1730 | struct ipmi_device_id *id = &smi_info->device_id; | |
50c812b2 | 1731 | if (id->manufacturer_id == DELL_IANA_MFR_ID) { |
d5a2b89a CM |
1732 | if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID && |
1733 | id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV && | |
50c812b2 | 1734 | id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) { |
d5a2b89a CM |
1735 | smi_info->oem_data_avail_handler = |
1736 | oem_data_avail_to_receive_msg_avail; | |
c305e3d3 CM |
1737 | } else if (ipmi_version_major(id) < 1 || |
1738 | (ipmi_version_major(id) == 1 && | |
1739 | ipmi_version_minor(id) < 5)) { | |
d5a2b89a CM |
1740 | smi_info->oem_data_avail_handler = |
1741 | oem_data_avail_to_receive_msg_avail; | |
1742 | } | |
3ae0e0f9 CM |
1743 | } |
1744 | } | |
1745 | ||
ea94027b CM |
1746 | #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA |
1747 | static void return_hosed_msg_badsize(struct smi_info *smi_info) | |
1748 | { | |
1749 | struct ipmi_smi_msg *msg = smi_info->curr_msg; | |
1750 | ||
25985edc | 1751 | /* Make it a response */ |
ea94027b CM |
1752 | msg->rsp[0] = msg->data[0] | 4; |
1753 | msg->rsp[1] = msg->data[1]; | |
1754 | msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH; | |
1755 | msg->rsp_size = 3; | |
1756 | smi_info->curr_msg = NULL; | |
1757 | deliver_recv_msg(smi_info, msg); | |
1758 | } | |
1759 | ||
1760 | /* | |
1761 | * dell_poweredge_bt_xaction_handler | |
1762 | * @info - smi_info.device_id must be populated | |
1763 | * | |
1764 | * Dell PowerEdge servers with the BT interface (x6xx and 1750) will | |
1765 | * not respond to a Get SDR command if the length of the data | |
1766 | * requested is exactly 0x3A, which leads to command timeouts and no | |
1767 | * data returned. This intercepts such commands, and causes userspace | |
1768 | * callers to try again with a different-sized buffer, which succeeds. | |
1769 | */ | |
1770 | ||
1771 | #define STORAGE_NETFN 0x0A | |
1772 | #define STORAGE_CMD_GET_SDR 0x23 | |
1773 | static int dell_poweredge_bt_xaction_handler(struct notifier_block *self, | |
1774 | unsigned long unused, | |
1775 | void *in) | |
1776 | { | |
1777 | struct smi_info *smi_info = in; | |
1778 | unsigned char *data = smi_info->curr_msg->data; | |
1779 | unsigned int size = smi_info->curr_msg->data_size; | |
1780 | if (size >= 8 && | |
1781 | (data[0]>>2) == STORAGE_NETFN && | |
1782 | data[1] == STORAGE_CMD_GET_SDR && | |
1783 | data[7] == 0x3A) { | |
1784 | return_hosed_msg_badsize(smi_info); | |
1785 | return NOTIFY_STOP; | |
1786 | } | |
1787 | return NOTIFY_DONE; | |
1788 | } | |
1789 | ||
1790 | static struct notifier_block dell_poweredge_bt_xaction_notifier = { | |
1791 | .notifier_call = dell_poweredge_bt_xaction_handler, | |
1792 | }; | |
1793 | ||
1794 | /* | |
1795 | * setup_dell_poweredge_bt_xaction_handler | |
1796 | * @info - smi_info.device_id must be filled in already | |
1797 | * | |
1798 | * Fills in smi_info.device_id.start_transaction_pre_hook | |
1799 | * when we know what function to use there. | |
1800 | */ | |
1801 | static void | |
1802 | setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info) | |
1803 | { | |
1804 | struct ipmi_device_id *id = &smi_info->device_id; | |
50c812b2 | 1805 | if (id->manufacturer_id == DELL_IANA_MFR_ID && |
910840f2 | 1806 | smi_info->io.si_type == SI_BT) |
ea94027b CM |
1807 | register_xaction_notifier(&dell_poweredge_bt_xaction_notifier); |
1808 | } | |
1809 | ||
3ae0e0f9 CM |
1810 | /* |
1811 | * setup_oem_data_handler | |
1812 | * @info - smi_info.device_id must be filled in already | |
1813 | * | |
1814 | * Fills in smi_info.device_id.oem_data_available_handler | |
1815 | * when we know what function to use there. | |
1816 | */ | |
1817 | ||
1818 | static void setup_oem_data_handler(struct smi_info *smi_info) | |
1819 | { | |
1820 | setup_dell_poweredge_oem_data_handler(smi_info); | |
1821 | } | |
1822 | ||
ea94027b CM |
1823 | static void setup_xaction_handlers(struct smi_info *smi_info) |
1824 | { | |
1825 | setup_dell_poweredge_bt_xaction_handler(smi_info); | |
1826 | } | |
1827 | ||
d0882897 CM |
1828 | static void check_for_broken_irqs(struct smi_info *smi_info) |
1829 | { | |
1830 | check_clr_rcv_irq(smi_info); | |
1831 | check_set_rcv_irq(smi_info); | |
1832 | } | |
1833 | ||
4f7f5551 | 1834 | static inline void stop_timer_and_thread(struct smi_info *smi_info) |
a9a2c44f | 1835 | { |
bd1c06a4 | 1836 | if (smi_info->thread != NULL) { |
b874b985 | 1837 | kthread_stop(smi_info->thread); |
bd1c06a4 MY |
1838 | smi_info->thread = NULL; |
1839 | } | |
4f7f5551 MY |
1840 | |
1841 | smi_info->timer_can_start = false; | |
c9acc3c4 | 1842 | del_timer_sync(&smi_info->si_timer); |
a9a2c44f CM |
1843 | } |
1844 | ||
7e030d6d | 1845 | static struct smi_info *find_dup_si(struct smi_info *info) |
1da177e4 | 1846 | { |
b0defcdb | 1847 | struct smi_info *e; |
1da177e4 | 1848 | |
b0defcdb | 1849 | list_for_each_entry(e, &smi_infos, link) { |
f6296bdc | 1850 | if (e->io.addr_space != info->io.addr_space) |
b0defcdb | 1851 | continue; |
94671710 CM |
1852 | if (e->io.addr_data == info->io.addr_data) { |
1853 | /* | |
1854 | * This is a cheap hack, ACPI doesn't have a defined | |
1855 | * slave address but SMBIOS does. Pick it up from | |
1856 | * any source that has it available. | |
1857 | */ | |
910840f2 CM |
1858 | if (info->io.slave_addr && !e->io.slave_addr) |
1859 | e->io.slave_addr = info->io.slave_addr; | |
7e030d6d | 1860 | return e; |
94671710 | 1861 | } |
b0defcdb | 1862 | } |
1da177e4 | 1863 | |
7e030d6d | 1864 | return NULL; |
b0defcdb | 1865 | } |
1da177e4 | 1866 | |
bb398a4c | 1867 | int ipmi_si_add_smi(struct si_sm_io *io) |
b0defcdb | 1868 | { |
2407d77a | 1869 | int rv = 0; |
bb398a4c | 1870 | struct smi_info *new_smi, *dup; |
b0defcdb | 1871 | |
41b766d6 CM |
1872 | /* |
1873 | * If the user gave us a hard-coded device at the same | |
1874 | * address, they presumably want us to use it and not what is | |
1875 | * in the firmware. | |
1876 | */ | |
3bb8ea40 | 1877 | if (io->addr_source != SI_HARDCODED && io->addr_source != SI_HOTMOD && |
f6296bdc | 1878 | ipmi_si_hardcode_match(io->addr_space, io->addr_data)) { |
41b766d6 CM |
1879 | dev_info(io->dev, |
1880 | "Hard-coded device at this address already exists"); | |
1881 | return -ENODEV; | |
1882 | } | |
1883 | ||
bb398a4c | 1884 | if (!io->io_setup) { |
f6296bdc | 1885 | if (io->addr_space == IPMI_IO_ADDR_SPACE) { |
58e27635 | 1886 | io->io_setup = ipmi_si_port_setup; |
f6296bdc | 1887 | } else if (io->addr_space == IPMI_MEM_ADDR_SPACE) { |
58e27635 | 1888 | io->io_setup = ipmi_si_mem_setup; |
e1eeb7f8 CM |
1889 | } else { |
1890 | return -EINVAL; | |
1891 | } | |
1892 | } | |
1893 | ||
67f4fb02 | 1894 | new_smi = kzalloc(sizeof(*new_smi), GFP_KERNEL); |
bb398a4c CM |
1895 | if (!new_smi) |
1896 | return -ENOMEM; | |
67f4fb02 | 1897 | spin_lock_init(&new_smi->si_lock); |
bb398a4c CM |
1898 | |
1899 | new_smi->io = *io; | |
1900 | ||
d6dfd131 | 1901 | mutex_lock(&smi_infos_lock); |
7e030d6d CM |
1902 | dup = find_dup_si(new_smi); |
1903 | if (dup) { | |
910840f2 CM |
1904 | if (new_smi->io.addr_source == SI_ACPI && |
1905 | dup->io.addr_source == SI_SMBIOS) { | |
7e030d6d | 1906 | /* We prefer ACPI over SMBIOS. */ |
910840f2 | 1907 | dev_info(dup->io.dev, |
7e030d6d | 1908 | "Removing SMBIOS-specified %s state machine in favor of ACPI\n", |
910840f2 | 1909 | si_to_str[new_smi->io.si_type]); |
7e030d6d CM |
1910 | cleanup_one_si(dup); |
1911 | } else { | |
910840f2 | 1912 | dev_info(new_smi->io.dev, |
7e030d6d | 1913 | "%s-specified %s state machine: duplicate\n", |
910840f2 CM |
1914 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1915 | si_to_str[new_smi->io.si_type]); | |
7e030d6d | 1916 | rv = -EBUSY; |
c0a32fe1 | 1917 | kfree(new_smi); |
7e030d6d CM |
1918 | goto out_err; |
1919 | } | |
b0defcdb | 1920 | } |
1da177e4 | 1921 | |
25880f7d | 1922 | pr_info("Adding %s-specified %s state machine\n", |
910840f2 CM |
1923 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1924 | si_to_str[new_smi->io.si_type]); | |
2407d77a | 1925 | |
2407d77a MG |
1926 | list_add_tail(&new_smi->link, &smi_infos); |
1927 | ||
93c303d2 | 1928 | if (initialized) |
bb398a4c | 1929 | rv = try_smi_init(new_smi); |
2407d77a MG |
1930 | out_err: |
1931 | mutex_unlock(&smi_infos_lock); | |
1932 | return rv; | |
1933 | } | |
1934 | ||
3f724c40 TC |
1935 | /* |
1936 | * Try to start up an interface. Must be called with smi_infos_lock | |
1937 | * held, primarily to keep smi_num consistent, we only one to do these | |
1938 | * one at a time. | |
1939 | */ | |
2407d77a MG |
1940 | static int try_smi_init(struct smi_info *new_smi) |
1941 | { | |
1942 | int rv = 0; | |
1943 | int i; | |
1944 | ||
25880f7d | 1945 | pr_info("Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n", |
910840f2 CM |
1946 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1947 | si_to_str[new_smi->io.si_type], | |
f6296bdc | 1948 | addr_space_to_str[new_smi->io.addr_space], |
bb2a08c0 | 1949 | new_smi->io.addr_data, |
910840f2 | 1950 | new_smi->io.slave_addr, new_smi->io.irq); |
2407d77a | 1951 | |
910840f2 | 1952 | switch (new_smi->io.si_type) { |
b0defcdb | 1953 | case SI_KCS: |
1da177e4 | 1954 | new_smi->handlers = &kcs_smi_handlers; |
b0defcdb CM |
1955 | break; |
1956 | ||
1957 | case SI_SMIC: | |
1da177e4 | 1958 | new_smi->handlers = &smic_smi_handlers; |
b0defcdb CM |
1959 | break; |
1960 | ||
1961 | case SI_BT: | |
1da177e4 | 1962 | new_smi->handlers = &bt_smi_handlers; |
b0defcdb CM |
1963 | break; |
1964 | ||
1965 | default: | |
1da177e4 LT |
1966 | /* No support for anything else yet. */ |
1967 | rv = -EIO; | |
1968 | goto out_err; | |
1969 | } | |
1970 | ||
57bccb4e | 1971 | new_smi->si_num = smi_num; |
3f724c40 | 1972 | |
1abf71ee | 1973 | /* Do this early so it's available for logs. */ |
910840f2 | 1974 | if (!new_smi->io.dev) { |
90b2d4f1 | 1975 | pr_err("IPMI interface added with no device\n"); |
8fe7990c | 1976 | rv = -EIO; |
90b2d4f1 | 1977 | goto out_err; |
1abf71ee CM |
1978 | } |
1979 | ||
1da177e4 LT |
1980 | /* Allocate the state machine's data and initialize it. */ |
1981 | new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL); | |
b0defcdb | 1982 | if (!new_smi->si_sm) { |
1da177e4 LT |
1983 | rv = -ENOMEM; |
1984 | goto out_err; | |
1985 | } | |
e1eeb7f8 CM |
1986 | new_smi->io.io_size = new_smi->handlers->init_data(new_smi->si_sm, |
1987 | &new_smi->io); | |
1da177e4 LT |
1988 | |
1989 | /* Now that we know the I/O size, we can set up the I/O. */ | |
e1eeb7f8 | 1990 | rv = new_smi->io.io_setup(&new_smi->io); |
1da177e4 | 1991 | if (rv) { |
910840f2 | 1992 | dev_err(new_smi->io.dev, "Could not set up I/O space\n"); |
1da177e4 LT |
1993 | goto out_err; |
1994 | } | |
1995 | ||
1da177e4 LT |
1996 | /* Do low-level detection first. */ |
1997 | if (new_smi->handlers->detect(new_smi->si_sm)) { | |
910840f2 CM |
1998 | if (new_smi->io.addr_source) |
1999 | dev_err(new_smi->io.dev, | |
2000 | "Interface detection failed\n"); | |
1da177e4 LT |
2001 | rv = -ENODEV; |
2002 | goto out_err; | |
2003 | } | |
2004 | ||
c305e3d3 CM |
2005 | /* |
2006 | * Attempt a get device id command. If it fails, we probably | |
2007 | * don't have a BMC here. | |
2008 | */ | |
1da177e4 | 2009 | rv = try_get_dev_id(new_smi); |
b0defcdb | 2010 | if (rv) { |
910840f2 CM |
2011 | if (new_smi->io.addr_source) |
2012 | dev_err(new_smi->io.dev, | |
2013 | "There appears to be no BMC at this location\n"); | |
1da177e4 | 2014 | goto out_err; |
b0defcdb | 2015 | } |
1da177e4 | 2016 | |
3ae0e0f9 | 2017 | setup_oem_data_handler(new_smi); |
ea94027b | 2018 | setup_xaction_handlers(new_smi); |
d0882897 | 2019 | check_for_broken_irqs(new_smi); |
3ae0e0f9 | 2020 | |
b874b985 | 2021 | new_smi->waiting_msg = NULL; |
1da177e4 LT |
2022 | new_smi->curr_msg = NULL; |
2023 | atomic_set(&new_smi->req_events, 0); | |
7aefac26 | 2024 | new_smi->run_to_completion = false; |
64959e2d CM |
2025 | for (i = 0; i < SI_NUM_STATS; i++) |
2026 | atomic_set(&new_smi->stats[i], 0); | |
1da177e4 | 2027 | |
7aefac26 | 2028 | new_smi->interrupt_disabled = true; |
89986496 | 2029 | atomic_set(&new_smi->need_watch, 0); |
1da177e4 | 2030 | |
40112ae7 CM |
2031 | rv = try_enable_event_buffer(new_smi); |
2032 | if (rv == 0) | |
7aefac26 | 2033 | new_smi->has_event_buffer = true; |
40112ae7 | 2034 | |
c305e3d3 CM |
2035 | /* |
2036 | * Start clearing the flags before we enable interrupts or the | |
2037 | * timer to avoid racing with the timer. | |
2038 | */ | |
4f7f5551 | 2039 | start_clear_flags(new_smi); |
d9b7e4f7 CM |
2040 | |
2041 | /* | |
2042 | * IRQ is defined to be set when non-zero. req_events will | |
2043 | * cause a global flags check that will enable interrupts. | |
2044 | */ | |
910840f2 | 2045 | if (new_smi->io.irq) { |
d9b7e4f7 CM |
2046 | new_smi->interrupt_disabled = false; |
2047 | atomic_set(&new_smi->req_events, 1); | |
2048 | } | |
1da177e4 | 2049 | |
3dd377b5 CM |
2050 | dev_set_drvdata(new_smi->io.dev, new_smi); |
2051 | rv = device_add_group(new_smi->io.dev, &ipmi_si_dev_attr_group); | |
2052 | if (rv) { | |
2053 | dev_err(new_smi->io.dev, | |
2054 | "Unable to add device attributes: error %d\n", | |
2055 | rv); | |
71404a2f | 2056 | goto out_err; |
3dd377b5 | 2057 | } |
cc095f0a | 2058 | new_smi->dev_group_added = true; |
3dd377b5 | 2059 | |
1da177e4 LT |
2060 | rv = ipmi_register_smi(&handlers, |
2061 | new_smi, | |
910840f2 CM |
2062 | new_smi->io.dev, |
2063 | new_smi->io.slave_addr); | |
1da177e4 | 2064 | if (rv) { |
910840f2 CM |
2065 | dev_err(new_smi->io.dev, |
2066 | "Unable to register device: error %d\n", | |
279fbd0c | 2067 | rv); |
71404a2f | 2068 | goto out_err; |
1da177e4 LT |
2069 | } |
2070 | ||
3f724c40 TC |
2071 | /* Don't increment till we know we have succeeded. */ |
2072 | smi_num++; | |
2073 | ||
910840f2 CM |
2074 | dev_info(new_smi->io.dev, "IPMI %s interface initialized\n", |
2075 | si_to_str[new_smi->io.si_type]); | |
1da177e4 | 2076 | |
910840f2 | 2077 | WARN_ON(new_smi->io.dev->init_name != NULL); |
b0defcdb | 2078 | |
2512e40e | 2079 | out_err: |
401e7e88 YY |
2080 | if (rv && new_smi->io.io_cleanup) { |
2081 | new_smi->io.io_cleanup(&new_smi->io); | |
2082 | new_smi->io.io_cleanup = NULL; | |
2083 | } | |
2084 | ||
6cf1a126 YY |
2085 | if (rv && new_smi->si_sm) { |
2086 | kfree(new_smi->si_sm); | |
2087 | new_smi->si_sm = NULL; | |
2088 | } | |
2089 | ||
1da177e4 LT |
2090 | return rv; |
2091 | } | |
2092 | ||
41b766d6 | 2093 | static int __init init_ipmi_si(void) |
1da177e4 | 2094 | { |
2407d77a | 2095 | struct smi_info *e; |
06ee4594 | 2096 | enum ipmi_addr_src type = SI_INVALID; |
1da177e4 LT |
2097 | |
2098 | if (initialized) | |
2099 | return 0; | |
1da177e4 | 2100 | |
41b766d6 | 2101 | ipmi_hardcode_init(); |
1da177e4 | 2102 | |
41b766d6 | 2103 | pr_info("IPMI System Interface driver\n"); |
d8cc5267 | 2104 | |
9d70029e CM |
2105 | ipmi_si_platform_init(); |
2106 | ||
13d0b35c | 2107 | ipmi_si_pci_init(); |
b0defcdb | 2108 | |
c6f85a75 | 2109 | ipmi_si_parisc_init(); |
fdbeb7de | 2110 | |
06ee4594 MG |
2111 | /* We prefer devices with interrupts, but in the case of a machine |
2112 | with multiple BMCs we assume that there will be several instances | |
2113 | of a given type so if we succeed in registering a type then also | |
2114 | try to register everything else of the same type */ | |
2407d77a MG |
2115 | mutex_lock(&smi_infos_lock); |
2116 | list_for_each_entry(e, &smi_infos, link) { | |
06ee4594 MG |
2117 | /* Try to register a device if it has an IRQ and we either |
2118 | haven't successfully registered a device yet or this | |
2119 | device has the same type as one we successfully registered */ | |
910840f2 | 2120 | if (e->io.irq && (!type || e->io.addr_source == type)) { |
d8cc5267 | 2121 | if (!try_smi_init(e)) { |
910840f2 | 2122 | type = e->io.addr_source; |
d8cc5267 MG |
2123 | } |
2124 | } | |
2125 | } | |
2126 | ||
06ee4594 | 2127 | /* type will only have been set if we successfully registered an si */ |
bb398a4c CM |
2128 | if (type) |
2129 | goto skip_fallback_noirq; | |
06ee4594 | 2130 | |
d8cc5267 MG |
2131 | /* Fall back to the preferred device */ |
2132 | ||
2133 | list_for_each_entry(e, &smi_infos, link) { | |
910840f2 | 2134 | if (!e->io.irq && (!type || e->io.addr_source == type)) { |
d8cc5267 | 2135 | if (!try_smi_init(e)) { |
910840f2 | 2136 | type = e->io.addr_source; |
d8cc5267 MG |
2137 | } |
2138 | } | |
2407d77a | 2139 | } |
bb398a4c CM |
2140 | |
2141 | skip_fallback_noirq: | |
dd7450ca | 2142 | initialized = true; |
2407d77a MG |
2143 | mutex_unlock(&smi_infos_lock); |
2144 | ||
06ee4594 MG |
2145 | if (type) |
2146 | return 0; | |
2147 | ||
d6dfd131 | 2148 | mutex_lock(&smi_infos_lock); |
b361e27b | 2149 | if (unload_when_empty && list_empty(&smi_infos)) { |
d6dfd131 | 2150 | mutex_unlock(&smi_infos_lock); |
d2478521 | 2151 | cleanup_ipmi_si(); |
25880f7d | 2152 | pr_warn("Unable to find any System Interface(s)\n"); |
1da177e4 | 2153 | return -ENODEV; |
b0defcdb | 2154 | } else { |
d6dfd131 | 2155 | mutex_unlock(&smi_infos_lock); |
b0defcdb | 2156 | return 0; |
1da177e4 | 2157 | } |
1da177e4 LT |
2158 | } |
2159 | module_init(init_ipmi_si); | |
2160 | ||
f6f1234d ZY |
2161 | static void wait_msg_processed(struct smi_info *smi_info) |
2162 | { | |
2163 | unsigned long jiffies_now; | |
2164 | long time_diff; | |
2165 | ||
2166 | while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) { | |
2167 | jiffies_now = jiffies; | |
2168 | time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies) | |
2169 | * SI_USEC_PER_JIFFY); | |
2170 | smi_event_handler(smi_info, time_diff); | |
2171 | schedule_timeout_uninterruptible(1); | |
2172 | } | |
2173 | } | |
2174 | ||
7960f18a | 2175 | static void shutdown_smi(void *send_info) |
1da177e4 | 2176 | { |
7960f18a | 2177 | struct smi_info *smi_info = send_info; |
b874b985 | 2178 | |
71404a2f CM |
2179 | if (smi_info->dev_group_added) { |
2180 | device_remove_group(smi_info->io.dev, &ipmi_si_dev_attr_group); | |
2181 | smi_info->dev_group_added = false; | |
2182 | } | |
2183 | if (smi_info->io.dev) | |
2184 | dev_set_drvdata(smi_info->io.dev, NULL); | |
b0defcdb | 2185 | |
c305e3d3 | 2186 | /* |
b874b985 CM |
2187 | * Make sure that interrupts, the timer and the thread are |
2188 | * stopped and will not run again. | |
c305e3d3 | 2189 | */ |
71404a2f CM |
2190 | smi_info->interrupt_disabled = true; |
2191 | if (smi_info->io.irq_cleanup) { | |
2192 | smi_info->io.irq_cleanup(&smi_info->io); | |
2193 | smi_info->io.irq_cleanup = NULL; | |
2194 | } | |
2195 | stop_timer_and_thread(smi_info); | |
2196 | ||
2197 | /* | |
2198 | * Wait until we know that we are out of any interrupt | |
2199 | * handlers might have been running before we freed the | |
2200 | * interrupt. | |
2201 | */ | |
17c0eb74 | 2202 | synchronize_rcu(); |
1da177e4 | 2203 | |
c305e3d3 CM |
2204 | /* |
2205 | * Timeouts are stopped, now make sure the interrupts are off | |
b874b985 CM |
2206 | * in the BMC. Note that timers and CPU interrupts are off, |
2207 | * so no need for locks. | |
c305e3d3 | 2208 | */ |
f6f1234d ZY |
2209 | wait_msg_processed(smi_info); |
2210 | ||
71404a2f CM |
2211 | if (smi_info->handlers) |
2212 | disable_si_irq(smi_info); | |
f6f1234d ZY |
2213 | |
2214 | wait_msg_processed(smi_info); | |
2215 | ||
71404a2f CM |
2216 | if (smi_info->handlers) |
2217 | smi_info->handlers->cleanup(smi_info->si_sm); | |
2218 | ||
71404a2f CM |
2219 | if (smi_info->io.io_cleanup) { |
2220 | smi_info->io.io_cleanup(&smi_info->io); | |
2221 | smi_info->io.io_cleanup = NULL; | |
2222 | } | |
1da177e4 | 2223 | |
71404a2f CM |
2224 | kfree(smi_info->si_sm); |
2225 | smi_info->si_sm = NULL; | |
2512e40e CM |
2226 | |
2227 | smi_info->intf = NULL; | |
71404a2f CM |
2228 | } |
2229 | ||
93c303d2 CM |
2230 | /* |
2231 | * Must be called with smi_infos_lock held, to serialize the | |
2232 | * smi_info->intf check. | |
2233 | */ | |
71404a2f CM |
2234 | static void cleanup_one_si(struct smi_info *smi_info) |
2235 | { | |
2236 | if (!smi_info) | |
2237 | return; | |
1da177e4 | 2238 | |
71404a2f | 2239 | list_del(&smi_info->link); |
9cc3aac4 | 2240 | ipmi_unregister_smi(smi_info->intf); |
71404a2f | 2241 | kfree(smi_info); |
1da177e4 LT |
2242 | } |
2243 | ||
87875c10 | 2244 | void ipmi_si_remove_by_dev(struct device *dev) |
bb398a4c CM |
2245 | { |
2246 | struct smi_info *e; | |
bb398a4c CM |
2247 | |
2248 | mutex_lock(&smi_infos_lock); | |
2249 | list_for_each_entry(e, &smi_infos, link) { | |
2250 | if (e->io.dev == dev) { | |
2251 | cleanup_one_si(e); | |
bb398a4c CM |
2252 | break; |
2253 | } | |
2254 | } | |
2255 | mutex_unlock(&smi_infos_lock); | |
bb398a4c CM |
2256 | } |
2257 | ||
bdb57b7b CM |
2258 | struct device *ipmi_si_remove_by_data(int addr_space, enum si_type si_type, |
2259 | unsigned long addr) | |
44814ec9 CM |
2260 | { |
2261 | /* remove */ | |
2262 | struct smi_info *e, *tmp_e; | |
bdb57b7b | 2263 | struct device *dev = NULL; |
44814ec9 CM |
2264 | |
2265 | mutex_lock(&smi_infos_lock); | |
2266 | list_for_each_entry_safe(e, tmp_e, &smi_infos, link) { | |
f6296bdc | 2267 | if (e->io.addr_space != addr_space) |
44814ec9 CM |
2268 | continue; |
2269 | if (e->io.si_type != si_type) | |
2270 | continue; | |
bdb57b7b CM |
2271 | if (e->io.addr_data == addr) { |
2272 | dev = get_device(e->io.dev); | |
44814ec9 | 2273 | cleanup_one_si(e); |
bdb57b7b | 2274 | } |
44814ec9 CM |
2275 | } |
2276 | mutex_unlock(&smi_infos_lock); | |
bdb57b7b CM |
2277 | |
2278 | return dev; | |
44814ec9 CM |
2279 | } |
2280 | ||
0dcf334c | 2281 | static void cleanup_ipmi_si(void) |
1da177e4 | 2282 | { |
b0defcdb | 2283 | struct smi_info *e, *tmp_e; |
1da177e4 | 2284 | |
b0defcdb | 2285 | if (!initialized) |
1da177e4 LT |
2286 | return; |
2287 | ||
13d0b35c | 2288 | ipmi_si_pci_shutdown(); |
c6f85a75 CM |
2289 | |
2290 | ipmi_si_parisc_shutdown(); | |
b0defcdb | 2291 | |
9d70029e | 2292 | ipmi_si_platform_shutdown(); |
dba9b4f6 | 2293 | |
d6dfd131 | 2294 | mutex_lock(&smi_infos_lock); |
b0defcdb CM |
2295 | list_for_each_entry_safe(e, tmp_e, &smi_infos, link) |
2296 | cleanup_one_si(e); | |
d6dfd131 | 2297 | mutex_unlock(&smi_infos_lock); |
41b766d6 CM |
2298 | |
2299 | ipmi_si_hardcode_exit(); | |
bdb57b7b | 2300 | ipmi_si_hotmod_exit(); |
1da177e4 LT |
2301 | } |
2302 | module_exit(cleanup_ipmi_si); | |
2303 | ||
0944d889 | 2304 | MODULE_ALIAS("platform:dmi-ipmi-si"); |
1da177e4 | 2305 | MODULE_LICENSE("GPL"); |
1fdd75bd | 2306 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
07cbd87b | 2307 | MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT system interfaces."); |