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" |
b361e27b CM |
43 | #include <linux/string.h> |
44 | #include <linux/ctype.h> | |
dba9b4f6 | 45 | |
1da177e4 LT |
46 | /* Measure times between events in the driver. */ |
47 | #undef DEBUG_TIMING | |
48 | ||
49 | /* Call every 10 ms. */ | |
50 | #define SI_TIMEOUT_TIME_USEC 10000 | |
51 | #define SI_USEC_PER_JIFFY (1000000/HZ) | |
52 | #define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY) | |
53 | #define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a | |
c305e3d3 | 54 | short timeout */ |
1da177e4 LT |
55 | |
56 | enum si_intf_state { | |
57 | SI_NORMAL, | |
58 | SI_GETTING_FLAGS, | |
59 | SI_GETTING_EVENTS, | |
60 | SI_CLEARING_FLAGS, | |
1da177e4 | 61 | SI_GETTING_MESSAGES, |
d9b7e4f7 CM |
62 | SI_CHECKING_ENABLES, |
63 | SI_SETTING_ENABLES | |
1da177e4 LT |
64 | /* FIXME - add watchdog stuff. */ |
65 | }; | |
66 | ||
9dbf68f9 CM |
67 | /* Some BT-specific defines we need here. */ |
68 | #define IPMI_BT_INTMASK_REG 2 | |
69 | #define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2 | |
70 | #define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1 | |
71 | ||
95e300c0 | 72 | static const char * const si_to_str[] = { "invalid", "kcs", "smic", "bt" }; |
1da177e4 | 73 | |
bb398a4c CM |
74 | static int initialized; |
75 | ||
64959e2d CM |
76 | /* |
77 | * Indexes into stats[] in smi_info below. | |
78 | */ | |
ba8ff1c6 CM |
79 | enum si_stat_indexes { |
80 | /* | |
81 | * Number of times the driver requested a timer while an operation | |
82 | * was in progress. | |
83 | */ | |
84 | SI_STAT_short_timeouts = 0, | |
85 | ||
86 | /* | |
87 | * Number of times the driver requested a timer while nothing was in | |
88 | * progress. | |
89 | */ | |
90 | SI_STAT_long_timeouts, | |
91 | ||
92 | /* Number of times the interface was idle while being polled. */ | |
93 | SI_STAT_idles, | |
94 | ||
95 | /* Number of interrupts the driver handled. */ | |
96 | SI_STAT_interrupts, | |
97 | ||
98 | /* Number of time the driver got an ATTN from the hardware. */ | |
99 | SI_STAT_attentions, | |
64959e2d | 100 | |
ba8ff1c6 CM |
101 | /* Number of times the driver requested flags from the hardware. */ |
102 | SI_STAT_flag_fetches, | |
103 | ||
104 | /* Number of times the hardware didn't follow the state machine. */ | |
105 | SI_STAT_hosed_count, | |
106 | ||
107 | /* Number of completed messages. */ | |
108 | SI_STAT_complete_transactions, | |
109 | ||
110 | /* Number of IPMI events received from the hardware. */ | |
111 | SI_STAT_events, | |
112 | ||
113 | /* Number of watchdog pretimeouts. */ | |
114 | SI_STAT_watchdog_pretimeouts, | |
115 | ||
b3834be5 | 116 | /* Number of asynchronous messages received. */ |
ba8ff1c6 CM |
117 | SI_STAT_incoming_messages, |
118 | ||
119 | ||
120 | /* This *must* remain last, add new values above this. */ | |
121 | SI_NUM_STATS | |
122 | }; | |
64959e2d | 123 | |
c305e3d3 | 124 | struct smi_info { |
57bccb4e | 125 | int si_num; |
a567b623 | 126 | struct ipmi_smi *intf; |
1da177e4 | 127 | struct si_sm_data *si_sm; |
81d02b7f | 128 | const struct si_sm_handlers *handlers; |
1da177e4 | 129 | spinlock_t si_lock; |
b874b985 | 130 | struct ipmi_smi_msg *waiting_msg; |
1da177e4 LT |
131 | struct ipmi_smi_msg *curr_msg; |
132 | enum si_intf_state si_state; | |
133 | ||
c305e3d3 CM |
134 | /* |
135 | * Used to handle the various types of I/O that can occur with | |
136 | * IPMI | |
137 | */ | |
1da177e4 | 138 | struct si_sm_io io; |
1da177e4 | 139 | |
c305e3d3 CM |
140 | /* |
141 | * Per-OEM handler, called from handle_flags(). Returns 1 | |
142 | * when handle_flags() needs to be re-run or 0 indicating it | |
143 | * set si_state itself. | |
144 | */ | |
3ae0e0f9 CM |
145 | int (*oem_data_avail_handler)(struct smi_info *smi_info); |
146 | ||
c305e3d3 CM |
147 | /* |
148 | * Flags from the last GET_MSG_FLAGS command, used when an ATTN | |
149 | * is set to hold the flags until we are done handling everything | |
150 | * from the flags. | |
151 | */ | |
1da177e4 LT |
152 | #define RECEIVE_MSG_AVAIL 0x01 |
153 | #define EVENT_MSG_BUFFER_FULL 0x02 | |
154 | #define WDT_PRE_TIMEOUT_INT 0x08 | |
3ae0e0f9 CM |
155 | #define OEM0_DATA_AVAIL 0x20 |
156 | #define OEM1_DATA_AVAIL 0x40 | |
157 | #define OEM2_DATA_AVAIL 0x80 | |
158 | #define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \ | |
c305e3d3 CM |
159 | OEM1_DATA_AVAIL | \ |
160 | OEM2_DATA_AVAIL) | |
1da177e4 LT |
161 | unsigned char msg_flags; |
162 | ||
40112ae7 | 163 | /* Does the BMC have an event buffer? */ |
7aefac26 | 164 | bool has_event_buffer; |
40112ae7 | 165 | |
c305e3d3 CM |
166 | /* |
167 | * If set to true, this will request events the next time the | |
168 | * state machine is idle. | |
169 | */ | |
1da177e4 LT |
170 | atomic_t req_events; |
171 | ||
c305e3d3 CM |
172 | /* |
173 | * If true, run the state machine to completion on every send | |
174 | * call. Generally used after a panic to make sure stuff goes | |
175 | * out. | |
176 | */ | |
7aefac26 | 177 | bool run_to_completion; |
1da177e4 | 178 | |
1da177e4 LT |
179 | /* The timer for this si. */ |
180 | struct timer_list si_timer; | |
181 | ||
4f7f5551 MY |
182 | /* This flag is set, if the timer can be set */ |
183 | bool timer_can_start; | |
184 | ||
48e8ac29 BS |
185 | /* This flag is set, if the timer is running (timer_pending() isn't enough) */ |
186 | bool timer_running; | |
187 | ||
1da177e4 LT |
188 | /* The time (in jiffies) the last timeout occurred at. */ |
189 | unsigned long last_timeout_jiffies; | |
190 | ||
89986496 CM |
191 | /* Are we waiting for the events, pretimeouts, received msgs? */ |
192 | atomic_t need_watch; | |
193 | ||
c305e3d3 CM |
194 | /* |
195 | * The driver will disable interrupts when it gets into a | |
196 | * situation where it cannot handle messages due to lack of | |
197 | * memory. Once that situation clears up, it will re-enable | |
198 | * interrupts. | |
199 | */ | |
7aefac26 | 200 | bool interrupt_disabled; |
1da177e4 | 201 | |
d9b7e4f7 CM |
202 | /* |
203 | * Does the BMC support events? | |
204 | */ | |
205 | bool supports_event_msg_buff; | |
206 | ||
1e7d6a45 | 207 | /* |
d0882897 CM |
208 | * Can we disable interrupts the global enables receive irq |
209 | * bit? There are currently two forms of brokenness, some | |
210 | * systems cannot disable the bit (which is technically within | |
211 | * the spec but a bad idea) and some systems have the bit | |
212 | * forced to zero even though interrupts work (which is | |
213 | * clearly outside the spec). The next bool tells which form | |
214 | * of brokenness is present. | |
1e7d6a45 | 215 | */ |
d0882897 CM |
216 | bool cannot_disable_irq; |
217 | ||
218 | /* | |
219 | * Some systems are broken and cannot set the irq enable | |
220 | * bit, even if they support interrupts. | |
221 | */ | |
222 | bool irq_enable_broken; | |
1e7d6a45 | 223 | |
a8df150c CM |
224 | /* |
225 | * Did we get an attention that we did not handle? | |
226 | */ | |
227 | bool got_attn; | |
228 | ||
50c812b2 | 229 | /* From the get device id response... */ |
3ae0e0f9 | 230 | struct ipmi_device_id device_id; |
1da177e4 | 231 | |
910840f2 | 232 | /* Default driver model device. */ |
50c812b2 CM |
233 | struct platform_device *pdev; |
234 | ||
cc095f0a CM |
235 | /* Have we added the device group to the device? */ |
236 | bool dev_group_added; | |
237 | ||
71404a2f CM |
238 | /* Have we added the platform device? */ |
239 | bool pdev_registered; | |
240 | ||
1da177e4 | 241 | /* Counters and things for the proc filesystem. */ |
64959e2d | 242 | atomic_t stats[SI_NUM_STATS]; |
a9a2c44f | 243 | |
c305e3d3 | 244 | struct task_struct *thread; |
b0defcdb CM |
245 | |
246 | struct list_head link; | |
1da177e4 LT |
247 | }; |
248 | ||
64959e2d CM |
249 | #define smi_inc_stat(smi, stat) \ |
250 | atomic_inc(&(smi)->stats[SI_STAT_ ## stat]) | |
251 | #define smi_get_stat(smi, stat) \ | |
252 | ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat])) | |
253 | ||
7a453308 CM |
254 | #define IPMI_MAX_INTFS 4 |
255 | static int force_kipmid[IPMI_MAX_INTFS]; | |
a51f4a81 CM |
256 | static int num_force_kipmid; |
257 | ||
7a453308 | 258 | static unsigned int kipmid_max_busy_us[IPMI_MAX_INTFS]; |
ae74e823 MW |
259 | static int num_max_busy_us; |
260 | ||
7aefac26 | 261 | static bool unload_when_empty = true; |
b361e27b | 262 | |
b0defcdb | 263 | static int try_smi_init(struct smi_info *smi); |
71404a2f | 264 | static void cleanup_one_si(struct smi_info *smi_info); |
d2478521 | 265 | static void cleanup_ipmi_si(void); |
b0defcdb | 266 | |
f93aae9f JS |
267 | #ifdef DEBUG_TIMING |
268 | void debug_timestamp(char *msg) | |
269 | { | |
48862ea2 | 270 | struct timespec64 t; |
f93aae9f | 271 | |
dd3535b9 | 272 | ktime_get_ts64(&t); |
48862ea2 | 273 | pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) t.tv_sec, t.tv_nsec); |
f93aae9f JS |
274 | } |
275 | #else | |
276 | #define debug_timestamp(x) | |
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; | |
f93aae9f | 322 | debug_timestamp("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 | |
f93aae9f | 542 | debug_timestamp("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 */ | |
910840f2 | 595 | dev_warn(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) { | |
910840f2 | 687 | dev_warn(smi_info->io.dev, |
0849bfec | 688 | "Couldn't get irq info: %x.\n", msg[2]); |
910840f2 | 689 | dev_warn(smi_info->io.dev, |
0849bfec | 690 | "Maybe ok, but ipmi might run very slowly.\n"); |
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) |
910840f2 | 725 | dev_warn(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 | |
f93aae9f | 905 | debug_timestamp("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 MW |
939 | /* |
940 | * Use -1 in the nsec value of the busy waiting timespec to tell that | |
941 | * we are spinning in kipmid looking for something and not delaying | |
942 | * between checks | |
943 | */ | |
48862ea2 | 944 | static inline void ipmi_si_set_not_busy(struct timespec64 *ts) |
ae74e823 MW |
945 | { |
946 | ts->tv_nsec = -1; | |
947 | } | |
48862ea2 | 948 | static inline int ipmi_si_is_busy(struct timespec64 *ts) |
ae74e823 MW |
949 | { |
950 | return ts->tv_nsec != -1; | |
951 | } | |
952 | ||
cc4cbe90 AB |
953 | static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result, |
954 | const struct smi_info *smi_info, | |
48862ea2 | 955 | struct timespec64 *busy_until) |
ae74e823 MW |
956 | { |
957 | unsigned int max_busy_us = 0; | |
958 | ||
57bccb4e CM |
959 | if (smi_info->si_num < num_max_busy_us) |
960 | max_busy_us = kipmid_max_busy_us[smi_info->si_num]; | |
ae74e823 MW |
961 | if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY) |
962 | ipmi_si_set_not_busy(busy_until); | |
963 | else if (!ipmi_si_is_busy(busy_until)) { | |
dd3535b9 | 964 | ktime_get_ts64(busy_until); |
48862ea2 | 965 | timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC); |
ae74e823 | 966 | } else { |
48862ea2 JS |
967 | struct timespec64 now; |
968 | ||
dd3535b9 | 969 | ktime_get_ts64(&now); |
48862ea2 | 970 | if (unlikely(timespec64_compare(&now, busy_until) > 0)) { |
ae74e823 MW |
971 | ipmi_si_set_not_busy(busy_until); |
972 | return 0; | |
973 | } | |
974 | } | |
975 | return 1; | |
976 | } | |
977 | ||
978 | ||
979 | /* | |
980 | * A busy-waiting loop for speeding up IPMI operation. | |
981 | * | |
982 | * Lousy hardware makes this hard. This is only enabled for systems | |
983 | * that are not BT and do not have interrupts. It starts spinning | |
984 | * when an operation is complete or until max_busy tells it to stop | |
985 | * (if that is enabled). See the paragraph on kimid_max_busy_us in | |
986 | * Documentation/IPMI.txt for details. | |
987 | */ | |
a9a2c44f CM |
988 | static int ipmi_thread(void *data) |
989 | { | |
990 | struct smi_info *smi_info = data; | |
e9a705a0 | 991 | unsigned long flags; |
a9a2c44f | 992 | enum si_sm_result smi_result; |
48862ea2 | 993 | struct timespec64 busy_until; |
a9a2c44f | 994 | |
ae74e823 | 995 | ipmi_si_set_not_busy(&busy_until); |
8698a745 | 996 | set_user_nice(current, MAX_NICE); |
e9a705a0 | 997 | while (!kthread_should_stop()) { |
ae74e823 MW |
998 | int busy_wait; |
999 | ||
a9a2c44f | 1000 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
8a3628d5 | 1001 | smi_result = smi_event_handler(smi_info, 0); |
48e8ac29 BS |
1002 | |
1003 | /* | |
1004 | * If the driver is doing something, there is a possible | |
1005 | * race with the timer. If the timer handler see idle, | |
1006 | * and the thread here sees something else, the timer | |
1007 | * handler won't restart the timer even though it is | |
1008 | * required. So start it here if necessary. | |
1009 | */ | |
1010 | if (smi_result != SI_SM_IDLE && !smi_info->timer_running) | |
1011 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
1012 | ||
a9a2c44f | 1013 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
ae74e823 MW |
1014 | busy_wait = ipmi_thread_busy_wait(smi_result, smi_info, |
1015 | &busy_until); | |
c305e3d3 CM |
1016 | if (smi_result == SI_SM_CALL_WITHOUT_DELAY) |
1017 | ; /* do nothing */ | |
ae74e823 | 1018 | else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait) |
33979734 | 1019 | schedule(); |
89986496 CM |
1020 | else if (smi_result == SI_SM_IDLE) { |
1021 | if (atomic_read(&smi_info->need_watch)) { | |
1022 | schedule_timeout_interruptible(100); | |
1023 | } else { | |
1024 | /* Wait to be woken up when we are needed. */ | |
1025 | __set_current_state(TASK_INTERRUPTIBLE); | |
1026 | schedule(); | |
1027 | } | |
1028 | } else | |
8d1f66dc | 1029 | schedule_timeout_interruptible(1); |
a9a2c44f | 1030 | } |
a9a2c44f CM |
1031 | return 0; |
1032 | } | |
1033 | ||
1034 | ||
1da177e4 LT |
1035 | static void poll(void *send_info) |
1036 | { | |
1037 | struct smi_info *smi_info = send_info; | |
f60adf42 | 1038 | unsigned long flags = 0; |
7aefac26 | 1039 | bool run_to_completion = smi_info->run_to_completion; |
1da177e4 | 1040 | |
15c62e10 CM |
1041 | /* |
1042 | * Make sure there is some delay in the poll loop so we can | |
1043 | * drive time forward and timeout things. | |
1044 | */ | |
1045 | udelay(10); | |
f60adf42 CM |
1046 | if (!run_to_completion) |
1047 | spin_lock_irqsave(&smi_info->si_lock, flags); | |
15c62e10 | 1048 | smi_event_handler(smi_info, 10); |
f60adf42 CM |
1049 | if (!run_to_completion) |
1050 | spin_unlock_irqrestore(&smi_info->si_lock, flags); | |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | static void request_events(void *send_info) | |
1054 | { | |
1055 | struct smi_info *smi_info = send_info; | |
1056 | ||
b874b985 | 1057 | if (!smi_info->has_event_buffer) |
b361e27b CM |
1058 | return; |
1059 | ||
1da177e4 LT |
1060 | atomic_set(&smi_info->req_events, 1); |
1061 | } | |
1062 | ||
c65ea996 | 1063 | static void set_need_watch(void *send_info, unsigned int watch_mask) |
89986496 CM |
1064 | { |
1065 | struct smi_info *smi_info = send_info; | |
1066 | unsigned long flags; | |
c65ea996 CM |
1067 | int enable; |
1068 | ||
e1891cff | 1069 | enable = !!watch_mask; |
89986496 CM |
1070 | |
1071 | atomic_set(&smi_info->need_watch, enable); | |
1072 | spin_lock_irqsave(&smi_info->si_lock, flags); | |
1073 | check_start_timer_thread(smi_info); | |
1074 | spin_unlock_irqrestore(&smi_info->si_lock, flags); | |
1075 | } | |
1076 | ||
e99e88a9 | 1077 | static void smi_timeout(struct timer_list *t) |
1da177e4 | 1078 | { |
e99e88a9 | 1079 | struct smi_info *smi_info = from_timer(smi_info, t, si_timer); |
1da177e4 LT |
1080 | enum si_sm_result smi_result; |
1081 | unsigned long flags; | |
1082 | unsigned long jiffies_now; | |
c4edff1c | 1083 | long time_diff; |
3326f4f2 | 1084 | long timeout; |
1da177e4 | 1085 | |
1da177e4 | 1086 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
f93aae9f JS |
1087 | debug_timestamp("Timer"); |
1088 | ||
1da177e4 | 1089 | jiffies_now = jiffies; |
c4edff1c | 1090 | time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies) |
1da177e4 LT |
1091 | * SI_USEC_PER_JIFFY); |
1092 | smi_result = smi_event_handler(smi_info, time_diff); | |
1093 | ||
910840f2 | 1094 | if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
1da177e4 | 1095 | /* Running with interrupts, only do long timeouts. */ |
3326f4f2 | 1096 | timeout = jiffies + SI_TIMEOUT_JIFFIES; |
64959e2d | 1097 | smi_inc_stat(smi_info, long_timeouts); |
3326f4f2 | 1098 | goto do_mod_timer; |
1da177e4 LT |
1099 | } |
1100 | ||
c305e3d3 CM |
1101 | /* |
1102 | * If the state machine asks for a short delay, then shorten | |
1103 | * the timer timeout. | |
1104 | */ | |
1da177e4 | 1105 | if (smi_result == SI_SM_CALL_WITH_DELAY) { |
64959e2d | 1106 | smi_inc_stat(smi_info, short_timeouts); |
3326f4f2 | 1107 | timeout = jiffies + 1; |
1da177e4 | 1108 | } else { |
64959e2d | 1109 | smi_inc_stat(smi_info, long_timeouts); |
3326f4f2 | 1110 | timeout = jiffies + SI_TIMEOUT_JIFFIES; |
1da177e4 LT |
1111 | } |
1112 | ||
76824852 | 1113 | do_mod_timer: |
3326f4f2 | 1114 | if (smi_result != SI_SM_IDLE) |
48e8ac29 BS |
1115 | smi_mod_timer(smi_info, timeout); |
1116 | else | |
1117 | smi_info->timer_running = false; | |
1118 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); | |
1da177e4 LT |
1119 | } |
1120 | ||
4f3e8199 | 1121 | irqreturn_t ipmi_si_irq_handler(int irq, void *data) |
1da177e4 LT |
1122 | { |
1123 | struct smi_info *smi_info = data; | |
1124 | unsigned long flags; | |
1da177e4 | 1125 | |
4f3e8199 CM |
1126 | if (smi_info->io.si_type == SI_BT) |
1127 | /* We need to clear the IRQ flag for the BT interface. */ | |
1128 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, | |
1129 | IPMI_BT_INTMASK_CLEAR_IRQ_BIT | |
1130 | | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
1131 | ||
1da177e4 LT |
1132 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
1133 | ||
64959e2d | 1134 | smi_inc_stat(smi_info, interrupts); |
1da177e4 | 1135 | |
f93aae9f JS |
1136 | debug_timestamp("Interrupt"); |
1137 | ||
1da177e4 | 1138 | smi_event_handler(smi_info, 0); |
1da177e4 LT |
1139 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
1140 | return IRQ_HANDLED; | |
1141 | } | |
1142 | ||
a567b623 CM |
1143 | static int smi_start_processing(void *send_info, |
1144 | struct ipmi_smi *intf) | |
453823ba CM |
1145 | { |
1146 | struct smi_info *new_smi = send_info; | |
a51f4a81 | 1147 | int enable = 0; |
453823ba CM |
1148 | |
1149 | new_smi->intf = intf; | |
1150 | ||
1151 | /* Set up the timer that drives the interface. */ | |
e99e88a9 | 1152 | timer_setup(&new_smi->si_timer, smi_timeout, 0); |
4f7f5551 | 1153 | new_smi->timer_can_start = true; |
48e8ac29 | 1154 | smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES); |
453823ba | 1155 | |
27f972d3 | 1156 | /* Try to claim any interrupts. */ |
4f3e8199 CM |
1157 | if (new_smi->io.irq_setup) { |
1158 | new_smi->io.irq_handler_data = new_smi; | |
1159 | new_smi->io.irq_setup(&new_smi->io); | |
1160 | } | |
27f972d3 | 1161 | |
a51f4a81 CM |
1162 | /* |
1163 | * Check if the user forcefully enabled the daemon. | |
1164 | */ | |
57bccb4e CM |
1165 | if (new_smi->si_num < num_force_kipmid) |
1166 | enable = force_kipmid[new_smi->si_num]; | |
df3fe8de CM |
1167 | /* |
1168 | * The BT interface is efficient enough to not need a thread, | |
1169 | * and there is no need for a thread if we have interrupts. | |
1170 | */ | |
910840f2 | 1171 | else if ((new_smi->io.si_type != SI_BT) && (!new_smi->io.irq)) |
a51f4a81 CM |
1172 | enable = 1; |
1173 | ||
1174 | if (enable) { | |
453823ba | 1175 | new_smi->thread = kthread_run(ipmi_thread, new_smi, |
57bccb4e | 1176 | "kipmi%d", new_smi->si_num); |
453823ba | 1177 | if (IS_ERR(new_smi->thread)) { |
910840f2 | 1178 | dev_notice(new_smi->io.dev, "Could not start" |
279fbd0c MS |
1179 | " kernel thread due to error %ld, only using" |
1180 | " timers to drive the interface\n", | |
1181 | PTR_ERR(new_smi->thread)); | |
453823ba CM |
1182 | new_smi->thread = NULL; |
1183 | } | |
1184 | } | |
1185 | ||
1186 | return 0; | |
1187 | } | |
9dbf68f9 | 1188 | |
16f4232c ZY |
1189 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) |
1190 | { | |
1191 | struct smi_info *smi = send_info; | |
1192 | ||
910840f2 CM |
1193 | data->addr_src = smi->io.addr_source; |
1194 | data->dev = smi->io.dev; | |
bb398a4c | 1195 | data->addr_info = smi->io.addr_info; |
910840f2 | 1196 | get_device(smi->io.dev); |
16f4232c ZY |
1197 | |
1198 | return 0; | |
1199 | } | |
1200 | ||
7aefac26 | 1201 | static void set_maintenance_mode(void *send_info, bool enable) |
b9675136 CM |
1202 | { |
1203 | struct smi_info *smi_info = send_info; | |
1204 | ||
1205 | if (!enable) | |
1206 | atomic_set(&smi_info->req_events, 0); | |
1207 | } | |
1208 | ||
7960f18a | 1209 | static void shutdown_smi(void *send_info); |
81d02b7f | 1210 | static const struct ipmi_smi_handlers handlers = { |
1da177e4 | 1211 | .owner = THIS_MODULE, |
453823ba | 1212 | .start_processing = smi_start_processing, |
7960f18a | 1213 | .shutdown = shutdown_smi, |
16f4232c | 1214 | .get_smi_info = get_smi_info, |
1da177e4 LT |
1215 | .sender = sender, |
1216 | .request_events = request_events, | |
89986496 | 1217 | .set_need_watch = set_need_watch, |
b9675136 | 1218 | .set_maintenance_mode = set_maintenance_mode, |
1da177e4 | 1219 | .set_run_to_completion = set_run_to_completion, |
82802f96 | 1220 | .flush_messages = flush_messages, |
1da177e4 LT |
1221 | .poll = poll, |
1222 | }; | |
1223 | ||
b0defcdb | 1224 | static LIST_HEAD(smi_infos); |
d6dfd131 | 1225 | static DEFINE_MUTEX(smi_infos_lock); |
b0defcdb | 1226 | static int smi_num; /* Used to sequence the SMIs */ |
1da177e4 | 1227 | |
99ee6735 | 1228 | static const char * const addr_space_to_str[] = { "i/o", "mem" }; |
b361e27b | 1229 | |
a51f4a81 CM |
1230 | module_param_array(force_kipmid, int, &num_force_kipmid, 0); |
1231 | MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or" | |
1232 | " disabled(0). Normally the IPMI driver auto-detects" | |
1233 | " this, but the value may be overridden by this parm."); | |
7aefac26 | 1234 | module_param(unload_when_empty, bool, 0); |
b361e27b CM |
1235 | MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are" |
1236 | " specified or found, default is 1. Setting to 0" | |
1237 | " is useful for hot add of devices using hotmod."); | |
ae74e823 MW |
1238 | module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644); |
1239 | MODULE_PARM_DESC(kipmid_max_busy_us, | |
1240 | "Max time (in microseconds) to busy-wait for IPMI data before" | |
1241 | " sleeping. 0 (default) means to wait forever. Set to 100-500" | |
1242 | " if kipmid is using up a lot of CPU time."); | |
1da177e4 | 1243 | |
4f3e8199 CM |
1244 | void ipmi_irq_finish_setup(struct si_sm_io *io) |
1245 | { | |
1246 | if (io->si_type == SI_BT) | |
1247 | /* Enable the interrupt in the BT interface. */ | |
1248 | io->outputb(io, IPMI_BT_INTMASK_REG, | |
1249 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
1250 | } | |
1da177e4 | 1251 | |
4f3e8199 | 1252 | void ipmi_irq_start_cleanup(struct si_sm_io *io) |
1da177e4 | 1253 | { |
4f3e8199 | 1254 | if (io->si_type == SI_BT) |
b0defcdb | 1255 | /* Disable the interrupt in the BT interface. */ |
4f3e8199 CM |
1256 | io->outputb(io, IPMI_BT_INTMASK_REG, 0); |
1257 | } | |
1258 | ||
1259 | static void std_irq_cleanup(struct si_sm_io *io) | |
1260 | { | |
1261 | ipmi_irq_start_cleanup(io); | |
1262 | free_irq(io->irq, io->irq_handler_data); | |
1da177e4 | 1263 | } |
1da177e4 | 1264 | |
4f3e8199 | 1265 | int ipmi_std_irq_setup(struct si_sm_io *io) |
1da177e4 LT |
1266 | { |
1267 | int rv; | |
1268 | ||
4f3e8199 | 1269 | if (!io->irq) |
1da177e4 LT |
1270 | return 0; |
1271 | ||
4f3e8199 CM |
1272 | rv = request_irq(io->irq, |
1273 | ipmi_si_irq_handler, | |
1274 | IRQF_SHARED, | |
1275 | DEVICE_NAME, | |
1276 | io->irq_handler_data); | |
1da177e4 | 1277 | if (rv) { |
4f3e8199 | 1278 | dev_warn(io->dev, "%s unable to claim interrupt %d," |
279fbd0c | 1279 | " running polled\n", |
4f3e8199 CM |
1280 | DEVICE_NAME, io->irq); |
1281 | io->irq = 0; | |
1da177e4 | 1282 | } else { |
4f3e8199 CM |
1283 | io->irq_cleanup = std_irq_cleanup; |
1284 | ipmi_irq_finish_setup(io); | |
1285 | dev_info(io->dev, "Using irq %d\n", io->irq); | |
1da177e4 LT |
1286 | } |
1287 | ||
1288 | return rv; | |
1289 | } | |
1290 | ||
40112ae7 | 1291 | static int wait_for_msg_done(struct smi_info *smi_info) |
1da177e4 | 1292 | { |
50c812b2 | 1293 | enum si_sm_result smi_result; |
1da177e4 LT |
1294 | |
1295 | smi_result = smi_info->handlers->event(smi_info->si_sm, 0); | |
c305e3d3 | 1296 | for (;;) { |
c3e7e791 CM |
1297 | if (smi_result == SI_SM_CALL_WITH_DELAY || |
1298 | smi_result == SI_SM_CALL_WITH_TICK_DELAY) { | |
da4cd8df | 1299 | schedule_timeout_uninterruptible(1); |
1da177e4 | 1300 | smi_result = smi_info->handlers->event( |
e21404dc | 1301 | smi_info->si_sm, jiffies_to_usecs(1)); |
c305e3d3 | 1302 | } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { |
1da177e4 LT |
1303 | smi_result = smi_info->handlers->event( |
1304 | smi_info->si_sm, 0); | |
c305e3d3 | 1305 | } else |
1da177e4 LT |
1306 | break; |
1307 | } | |
40112ae7 | 1308 | if (smi_result == SI_SM_HOSED) |
c305e3d3 CM |
1309 | /* |
1310 | * We couldn't get the state machine to run, so whatever's at | |
1311 | * the port is probably not an IPMI SMI interface. | |
1312 | */ | |
40112ae7 CM |
1313 | return -ENODEV; |
1314 | ||
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | static int try_get_dev_id(struct smi_info *smi_info) | |
1319 | { | |
1320 | unsigned char msg[2]; | |
1321 | unsigned char *resp; | |
1322 | unsigned long resp_len; | |
1323 | int rv = 0; | |
1324 | ||
1325 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1326 | if (!resp) | |
1327 | return -ENOMEM; | |
1328 | ||
1329 | /* | |
1330 | * Do a Get Device ID command, since it comes back with some | |
1331 | * useful info. | |
1332 | */ | |
1333 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1334 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1335 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1336 | ||
1337 | rv = wait_for_msg_done(smi_info); | |
1338 | if (rv) | |
1da177e4 | 1339 | goto out; |
1da177e4 | 1340 | |
1da177e4 LT |
1341 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
1342 | resp, IPMI_MAX_MSG_LENGTH); | |
1da177e4 | 1343 | |
d8c98618 | 1344 | /* Check and record info from the get device id, in case we need it. */ |
c468f911 JK |
1345 | rv = ipmi_demangle_device_id(resp[0] >> 2, resp[1], |
1346 | resp + 2, resp_len - 2, &smi_info->device_id); | |
1da177e4 | 1347 | |
76824852 | 1348 | out: |
1da177e4 LT |
1349 | kfree(resp); |
1350 | return rv; | |
1351 | } | |
1352 | ||
d0882897 | 1353 | static int get_global_enables(struct smi_info *smi_info, u8 *enables) |
1e7d6a45 CM |
1354 | { |
1355 | unsigned char msg[3]; | |
1356 | unsigned char *resp; | |
1357 | unsigned long resp_len; | |
1358 | int rv; | |
1359 | ||
1360 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
d0882897 CM |
1361 | if (!resp) |
1362 | return -ENOMEM; | |
1e7d6a45 CM |
1363 | |
1364 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1365 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1366 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1367 | ||
1368 | rv = wait_for_msg_done(smi_info); | |
1369 | if (rv) { | |
910840f2 | 1370 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1371 | "Error getting response from get global enables command: %d\n", |
1372 | rv); | |
1e7d6a45 CM |
1373 | goto out; |
1374 | } | |
1375 | ||
1376 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1377 | resp, IPMI_MAX_MSG_LENGTH); | |
1378 | ||
1379 | if (resp_len < 4 || | |
1380 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1381 | resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || | |
1382 | resp[2] != 0) { | |
910840f2 | 1383 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1384 | "Invalid return from get global enables command: %ld %x %x %x\n", |
1385 | resp_len, resp[0], resp[1], resp[2]); | |
1e7d6a45 CM |
1386 | rv = -EINVAL; |
1387 | goto out; | |
d0882897 CM |
1388 | } else { |
1389 | *enables = resp[3]; | |
1e7d6a45 CM |
1390 | } |
1391 | ||
d0882897 CM |
1392 | out: |
1393 | kfree(resp); | |
1394 | return rv; | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * Returns 1 if it gets an error from the command. | |
1399 | */ | |
1400 | static int set_global_enables(struct smi_info *smi_info, u8 enables) | |
1401 | { | |
1402 | unsigned char msg[3]; | |
1403 | unsigned char *resp; | |
1404 | unsigned long resp_len; | |
1405 | int rv; | |
1406 | ||
1407 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1408 | if (!resp) | |
1409 | return -ENOMEM; | |
1e7d6a45 CM |
1410 | |
1411 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1412 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
d0882897 | 1413 | msg[2] = enables; |
1e7d6a45 CM |
1414 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); |
1415 | ||
1416 | rv = wait_for_msg_done(smi_info); | |
1417 | if (rv) { | |
910840f2 | 1418 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1419 | "Error getting response from set global enables command: %d\n", |
1420 | rv); | |
1e7d6a45 CM |
1421 | goto out; |
1422 | } | |
1423 | ||
1424 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1425 | resp, IPMI_MAX_MSG_LENGTH); | |
1426 | ||
1427 | if (resp_len < 3 || | |
1428 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1429 | resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { | |
910840f2 | 1430 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1431 | "Invalid return from set global enables command: %ld %x %x\n", |
1432 | resp_len, resp[0], resp[1]); | |
1e7d6a45 CM |
1433 | rv = -EINVAL; |
1434 | goto out; | |
1435 | } | |
1436 | ||
d0882897 CM |
1437 | if (resp[2] != 0) |
1438 | rv = 1; | |
1439 | ||
1440 | out: | |
1441 | kfree(resp); | |
1442 | return rv; | |
1443 | } | |
1444 | ||
1445 | /* | |
1446 | * Some BMCs do not support clearing the receive irq bit in the global | |
1447 | * enables (even if they don't support interrupts on the BMC). Check | |
1448 | * for this and handle it properly. | |
1449 | */ | |
1450 | static void check_clr_rcv_irq(struct smi_info *smi_info) | |
1451 | { | |
1452 | u8 enables = 0; | |
1453 | int rv; | |
1454 | ||
1455 | rv = get_global_enables(smi_info, &enables); | |
1456 | if (!rv) { | |
1457 | if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0) | |
1458 | /* Already clear, should work ok. */ | |
1459 | return; | |
1460 | ||
1461 | enables &= ~IPMI_BMC_RCV_MSG_INTR; | |
1462 | rv = set_global_enables(smi_info, enables); | |
1463 | } | |
1464 | ||
1465 | if (rv < 0) { | |
910840f2 | 1466 | dev_err(smi_info->io.dev, |
d0882897 CM |
1467 | "Cannot check clearing the rcv irq: %d\n", rv); |
1468 | return; | |
1469 | } | |
1470 | ||
1471 | if (rv) { | |
1e7d6a45 CM |
1472 | /* |
1473 | * An error when setting the event buffer bit means | |
1474 | * clearing the bit is not supported. | |
1475 | */ | |
910840f2 | 1476 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1477 | "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
1478 | smi_info->cannot_disable_irq = true; | |
1479 | } | |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * Some BMCs do not support setting the interrupt bits in the global | |
1484 | * enables even if they support interrupts. Clearly bad, but we can | |
1485 | * compensate. | |
1486 | */ | |
1487 | static void check_set_rcv_irq(struct smi_info *smi_info) | |
1488 | { | |
1489 | u8 enables = 0; | |
1490 | int rv; | |
1491 | ||
910840f2 | 1492 | if (!smi_info->io.irq) |
d0882897 CM |
1493 | return; |
1494 | ||
1495 | rv = get_global_enables(smi_info, &enables); | |
1496 | if (!rv) { | |
1497 | enables |= IPMI_BMC_RCV_MSG_INTR; | |
1498 | rv = set_global_enables(smi_info, enables); | |
1499 | } | |
1500 | ||
1501 | if (rv < 0) { | |
910840f2 | 1502 | dev_err(smi_info->io.dev, |
d0882897 CM |
1503 | "Cannot check setting the rcv irq: %d\n", rv); |
1504 | return; | |
1505 | } | |
1506 | ||
1507 | if (rv) { | |
1508 | /* | |
1509 | * An error when setting the event buffer bit means | |
1510 | * setting the bit is not supported. | |
1511 | */ | |
910840f2 | 1512 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1513 | "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
1514 | smi_info->cannot_disable_irq = true; | |
1515 | smi_info->irq_enable_broken = true; | |
1e7d6a45 | 1516 | } |
1e7d6a45 CM |
1517 | } |
1518 | ||
40112ae7 CM |
1519 | static int try_enable_event_buffer(struct smi_info *smi_info) |
1520 | { | |
1521 | unsigned char msg[3]; | |
1522 | unsigned char *resp; | |
1523 | unsigned long resp_len; | |
1524 | int rv = 0; | |
1525 | ||
1526 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1527 | if (!resp) | |
1528 | return -ENOMEM; | |
1529 | ||
1530 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1531 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1532 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1533 | ||
1534 | rv = wait_for_msg_done(smi_info); | |
1535 | if (rv) { | |
25880f7d | 1536 | pr_warn("Error getting response from get global enables command, the event buffer is not enabled\n"); |
40112ae7 CM |
1537 | goto out; |
1538 | } | |
1539 | ||
1540 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1541 | resp, IPMI_MAX_MSG_LENGTH); | |
1542 | ||
1543 | if (resp_len < 4 || | |
1544 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1545 | resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || | |
1546 | resp[2] != 0) { | |
25880f7d | 1547 | pr_warn("Invalid return from get global enables command, cannot enable the event buffer\n"); |
40112ae7 CM |
1548 | rv = -EINVAL; |
1549 | goto out; | |
1550 | } | |
1551 | ||
d9b7e4f7 | 1552 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
40112ae7 | 1553 | /* buffer is already enabled, nothing to do. */ |
d9b7e4f7 | 1554 | smi_info->supports_event_msg_buff = true; |
40112ae7 | 1555 | goto out; |
d9b7e4f7 | 1556 | } |
40112ae7 CM |
1557 | |
1558 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1559 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1560 | msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF; | |
1561 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); | |
1562 | ||
1563 | rv = wait_for_msg_done(smi_info); | |
1564 | if (rv) { | |
25880f7d | 1565 | pr_warn("Error getting response from set global, enables command, the event buffer is not enabled\n"); |
40112ae7 CM |
1566 | goto out; |
1567 | } | |
1568 | ||
1569 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1570 | resp, IPMI_MAX_MSG_LENGTH); | |
1571 | ||
1572 | if (resp_len < 3 || | |
1573 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1574 | resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { | |
25880f7d | 1575 | pr_warn("Invalid return from get global, enables command, not enable the event buffer\n"); |
40112ae7 CM |
1576 | rv = -EINVAL; |
1577 | goto out; | |
1578 | } | |
1579 | ||
1580 | if (resp[2] != 0) | |
1581 | /* | |
1582 | * An error when setting the event buffer bit means | |
1583 | * that the event buffer is not supported. | |
1584 | */ | |
1585 | rv = -ENOENT; | |
d9b7e4f7 CM |
1586 | else |
1587 | smi_info->supports_event_msg_buff = true; | |
1588 | ||
76824852 | 1589 | out: |
40112ae7 CM |
1590 | kfree(resp); |
1591 | return rv; | |
1592 | } | |
1593 | ||
3dd377b5 CM |
1594 | #define IPMI_SI_ATTR(name) \ |
1595 | static ssize_t ipmi_##name##_show(struct device *dev, \ | |
1596 | struct device_attribute *attr, \ | |
1597 | char *buf) \ | |
1598 | { \ | |
1599 | struct smi_info *smi_info = dev_get_drvdata(dev); \ | |
1600 | \ | |
1601 | return snprintf(buf, 10, "%u\n", smi_get_stat(smi_info, name)); \ | |
1602 | } \ | |
1603 | static DEVICE_ATTR(name, S_IRUGO, ipmi_##name##_show, NULL) | |
1604 | ||
1605 | static ssize_t ipmi_type_show(struct device *dev, | |
1606 | struct device_attribute *attr, | |
1607 | char *buf) | |
1608 | { | |
1609 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1610 | ||
1611 | return snprintf(buf, 10, "%s\n", si_to_str[smi_info->io.si_type]); | |
1612 | } | |
1613 | static DEVICE_ATTR(type, S_IRUGO, ipmi_type_show, NULL); | |
1614 | ||
1615 | static ssize_t ipmi_interrupts_enabled_show(struct device *dev, | |
1616 | struct device_attribute *attr, | |
1617 | char *buf) | |
1618 | { | |
1619 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1620 | int enabled = smi_info->io.irq && !smi_info->interrupt_disabled; | |
1621 | ||
1622 | return snprintf(buf, 10, "%d\n", enabled); | |
1623 | } | |
1624 | static DEVICE_ATTR(interrupts_enabled, S_IRUGO, | |
1625 | ipmi_interrupts_enabled_show, NULL); | |
1626 | ||
1627 | IPMI_SI_ATTR(short_timeouts); | |
1628 | IPMI_SI_ATTR(long_timeouts); | |
1629 | IPMI_SI_ATTR(idles); | |
1630 | IPMI_SI_ATTR(interrupts); | |
1631 | IPMI_SI_ATTR(attentions); | |
1632 | IPMI_SI_ATTR(flag_fetches); | |
1633 | IPMI_SI_ATTR(hosed_count); | |
1634 | IPMI_SI_ATTR(complete_transactions); | |
1635 | IPMI_SI_ATTR(events); | |
1636 | IPMI_SI_ATTR(watchdog_pretimeouts); | |
1637 | IPMI_SI_ATTR(incoming_messages); | |
1638 | ||
1639 | static ssize_t ipmi_params_show(struct device *dev, | |
1640 | struct device_attribute *attr, | |
1641 | char *buf) | |
1642 | { | |
1643 | struct smi_info *smi_info = dev_get_drvdata(dev); | |
1644 | ||
1645 | return snprintf(buf, 200, | |
1646 | "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n", | |
1647 | si_to_str[smi_info->io.si_type], | |
f6296bdc | 1648 | addr_space_to_str[smi_info->io.addr_space], |
3dd377b5 CM |
1649 | smi_info->io.addr_data, |
1650 | smi_info->io.regspacing, | |
1651 | smi_info->io.regsize, | |
1652 | smi_info->io.regshift, | |
1653 | smi_info->io.irq, | |
1654 | smi_info->io.slave_addr); | |
1655 | } | |
1656 | static DEVICE_ATTR(params, S_IRUGO, ipmi_params_show, NULL); | |
1657 | ||
1658 | static struct attribute *ipmi_si_dev_attrs[] = { | |
1659 | &dev_attr_type.attr, | |
1660 | &dev_attr_interrupts_enabled.attr, | |
1661 | &dev_attr_short_timeouts.attr, | |
1662 | &dev_attr_long_timeouts.attr, | |
1663 | &dev_attr_idles.attr, | |
1664 | &dev_attr_interrupts.attr, | |
1665 | &dev_attr_attentions.attr, | |
1666 | &dev_attr_flag_fetches.attr, | |
1667 | &dev_attr_hosed_count.attr, | |
1668 | &dev_attr_complete_transactions.attr, | |
1669 | &dev_attr_events.attr, | |
1670 | &dev_attr_watchdog_pretimeouts.attr, | |
1671 | &dev_attr_incoming_messages.attr, | |
1672 | &dev_attr_params.attr, | |
1673 | NULL | |
1674 | }; | |
1675 | ||
1676 | static const struct attribute_group ipmi_si_dev_attr_group = { | |
1677 | .attrs = ipmi_si_dev_attrs, | |
1678 | }; | |
1679 | ||
3ae0e0f9 CM |
1680 | /* |
1681 | * oem_data_avail_to_receive_msg_avail | |
1682 | * @info - smi_info structure with msg_flags set | |
1683 | * | |
1684 | * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL | |
1685 | * Returns 1 indicating need to re-run handle_flags(). | |
1686 | */ | |
1687 | static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info) | |
1688 | { | |
e8b33617 | 1689 | smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) | |
c305e3d3 | 1690 | RECEIVE_MSG_AVAIL); |
3ae0e0f9 CM |
1691 | return 1; |
1692 | } | |
1693 | ||
1694 | /* | |
1695 | * setup_dell_poweredge_oem_data_handler | |
1696 | * @info - smi_info.device_id must be populated | |
1697 | * | |
1698 | * Systems that match, but have firmware version < 1.40 may assert | |
1699 | * OEM0_DATA_AVAIL on their own, without being told via Set Flags that | |
1700 | * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL | |
1701 | * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags | |
1702 | * as RECEIVE_MSG_AVAIL instead. | |
1703 | * | |
1704 | * As Dell has no plans to release IPMI 1.5 firmware that *ever* | |
1705 | * assert the OEM[012] bits, and if it did, the driver would have to | |
1706 | * change to handle that properly, we don't actually check for the | |
1707 | * firmware version. | |
1708 | * Device ID = 0x20 BMC on PowerEdge 8G servers | |
1709 | * Device Revision = 0x80 | |
1710 | * Firmware Revision1 = 0x01 BMC version 1.40 | |
1711 | * Firmware Revision2 = 0x40 BCD encoded | |
1712 | * IPMI Version = 0x51 IPMI 1.5 | |
1713 | * Manufacturer ID = A2 02 00 Dell IANA | |
1714 | * | |
d5a2b89a CM |
1715 | * Additionally, PowerEdge systems with IPMI < 1.5 may also assert |
1716 | * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL. | |
1717 | * | |
3ae0e0f9 CM |
1718 | */ |
1719 | #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20 | |
1720 | #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80 | |
1721 | #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51 | |
50c812b2 | 1722 | #define DELL_IANA_MFR_ID 0x0002a2 |
3ae0e0f9 CM |
1723 | static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info) |
1724 | { | |
1725 | struct ipmi_device_id *id = &smi_info->device_id; | |
50c812b2 | 1726 | if (id->manufacturer_id == DELL_IANA_MFR_ID) { |
d5a2b89a CM |
1727 | if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID && |
1728 | id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV && | |
50c812b2 | 1729 | id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) { |
d5a2b89a CM |
1730 | smi_info->oem_data_avail_handler = |
1731 | oem_data_avail_to_receive_msg_avail; | |
c305e3d3 CM |
1732 | } else if (ipmi_version_major(id) < 1 || |
1733 | (ipmi_version_major(id) == 1 && | |
1734 | ipmi_version_minor(id) < 5)) { | |
d5a2b89a CM |
1735 | smi_info->oem_data_avail_handler = |
1736 | oem_data_avail_to_receive_msg_avail; | |
1737 | } | |
3ae0e0f9 CM |
1738 | } |
1739 | } | |
1740 | ||
ea94027b CM |
1741 | #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA |
1742 | static void return_hosed_msg_badsize(struct smi_info *smi_info) | |
1743 | { | |
1744 | struct ipmi_smi_msg *msg = smi_info->curr_msg; | |
1745 | ||
25985edc | 1746 | /* Make it a response */ |
ea94027b CM |
1747 | msg->rsp[0] = msg->data[0] | 4; |
1748 | msg->rsp[1] = msg->data[1]; | |
1749 | msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH; | |
1750 | msg->rsp_size = 3; | |
1751 | smi_info->curr_msg = NULL; | |
1752 | deliver_recv_msg(smi_info, msg); | |
1753 | } | |
1754 | ||
1755 | /* | |
1756 | * dell_poweredge_bt_xaction_handler | |
1757 | * @info - smi_info.device_id must be populated | |
1758 | * | |
1759 | * Dell PowerEdge servers with the BT interface (x6xx and 1750) will | |
1760 | * not respond to a Get SDR command if the length of the data | |
1761 | * requested is exactly 0x3A, which leads to command timeouts and no | |
1762 | * data returned. This intercepts such commands, and causes userspace | |
1763 | * callers to try again with a different-sized buffer, which succeeds. | |
1764 | */ | |
1765 | ||
1766 | #define STORAGE_NETFN 0x0A | |
1767 | #define STORAGE_CMD_GET_SDR 0x23 | |
1768 | static int dell_poweredge_bt_xaction_handler(struct notifier_block *self, | |
1769 | unsigned long unused, | |
1770 | void *in) | |
1771 | { | |
1772 | struct smi_info *smi_info = in; | |
1773 | unsigned char *data = smi_info->curr_msg->data; | |
1774 | unsigned int size = smi_info->curr_msg->data_size; | |
1775 | if (size >= 8 && | |
1776 | (data[0]>>2) == STORAGE_NETFN && | |
1777 | data[1] == STORAGE_CMD_GET_SDR && | |
1778 | data[7] == 0x3A) { | |
1779 | return_hosed_msg_badsize(smi_info); | |
1780 | return NOTIFY_STOP; | |
1781 | } | |
1782 | return NOTIFY_DONE; | |
1783 | } | |
1784 | ||
1785 | static struct notifier_block dell_poweredge_bt_xaction_notifier = { | |
1786 | .notifier_call = dell_poweredge_bt_xaction_handler, | |
1787 | }; | |
1788 | ||
1789 | /* | |
1790 | * setup_dell_poweredge_bt_xaction_handler | |
1791 | * @info - smi_info.device_id must be filled in already | |
1792 | * | |
1793 | * Fills in smi_info.device_id.start_transaction_pre_hook | |
1794 | * when we know what function to use there. | |
1795 | */ | |
1796 | static void | |
1797 | setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info) | |
1798 | { | |
1799 | struct ipmi_device_id *id = &smi_info->device_id; | |
50c812b2 | 1800 | if (id->manufacturer_id == DELL_IANA_MFR_ID && |
910840f2 | 1801 | smi_info->io.si_type == SI_BT) |
ea94027b CM |
1802 | register_xaction_notifier(&dell_poweredge_bt_xaction_notifier); |
1803 | } | |
1804 | ||
3ae0e0f9 CM |
1805 | /* |
1806 | * setup_oem_data_handler | |
1807 | * @info - smi_info.device_id must be filled in already | |
1808 | * | |
1809 | * Fills in smi_info.device_id.oem_data_available_handler | |
1810 | * when we know what function to use there. | |
1811 | */ | |
1812 | ||
1813 | static void setup_oem_data_handler(struct smi_info *smi_info) | |
1814 | { | |
1815 | setup_dell_poweredge_oem_data_handler(smi_info); | |
1816 | } | |
1817 | ||
ea94027b CM |
1818 | static void setup_xaction_handlers(struct smi_info *smi_info) |
1819 | { | |
1820 | setup_dell_poweredge_bt_xaction_handler(smi_info); | |
1821 | } | |
1822 | ||
d0882897 CM |
1823 | static void check_for_broken_irqs(struct smi_info *smi_info) |
1824 | { | |
1825 | check_clr_rcv_irq(smi_info); | |
1826 | check_set_rcv_irq(smi_info); | |
1827 | } | |
1828 | ||
4f7f5551 | 1829 | static inline void stop_timer_and_thread(struct smi_info *smi_info) |
a9a2c44f | 1830 | { |
bd1c06a4 | 1831 | if (smi_info->thread != NULL) { |
b874b985 | 1832 | kthread_stop(smi_info->thread); |
bd1c06a4 MY |
1833 | smi_info->thread = NULL; |
1834 | } | |
4f7f5551 MY |
1835 | |
1836 | smi_info->timer_can_start = false; | |
b874b985 | 1837 | if (smi_info->timer_running) |
453823ba | 1838 | del_timer_sync(&smi_info->si_timer); |
a9a2c44f CM |
1839 | } |
1840 | ||
7e030d6d | 1841 | static struct smi_info *find_dup_si(struct smi_info *info) |
1da177e4 | 1842 | { |
b0defcdb | 1843 | struct smi_info *e; |
1da177e4 | 1844 | |
b0defcdb | 1845 | list_for_each_entry(e, &smi_infos, link) { |
f6296bdc | 1846 | if (e->io.addr_space != info->io.addr_space) |
b0defcdb | 1847 | continue; |
94671710 CM |
1848 | if (e->io.addr_data == info->io.addr_data) { |
1849 | /* | |
1850 | * This is a cheap hack, ACPI doesn't have a defined | |
1851 | * slave address but SMBIOS does. Pick it up from | |
1852 | * any source that has it available. | |
1853 | */ | |
910840f2 CM |
1854 | if (info->io.slave_addr && !e->io.slave_addr) |
1855 | e->io.slave_addr = info->io.slave_addr; | |
7e030d6d | 1856 | return e; |
94671710 | 1857 | } |
b0defcdb | 1858 | } |
1da177e4 | 1859 | |
7e030d6d | 1860 | return NULL; |
b0defcdb | 1861 | } |
1da177e4 | 1862 | |
bb398a4c | 1863 | int ipmi_si_add_smi(struct si_sm_io *io) |
b0defcdb | 1864 | { |
2407d77a | 1865 | int rv = 0; |
bb398a4c | 1866 | struct smi_info *new_smi, *dup; |
b0defcdb | 1867 | |
41b766d6 CM |
1868 | /* |
1869 | * If the user gave us a hard-coded device at the same | |
1870 | * address, they presumably want us to use it and not what is | |
1871 | * in the firmware. | |
1872 | */ | |
3bb8ea40 | 1873 | if (io->addr_source != SI_HARDCODED && io->addr_source != SI_HOTMOD && |
f6296bdc | 1874 | ipmi_si_hardcode_match(io->addr_space, io->addr_data)) { |
41b766d6 CM |
1875 | dev_info(io->dev, |
1876 | "Hard-coded device at this address already exists"); | |
1877 | return -ENODEV; | |
1878 | } | |
1879 | ||
bb398a4c | 1880 | if (!io->io_setup) { |
f6296bdc | 1881 | if (io->addr_space == IPMI_IO_ADDR_SPACE) { |
58e27635 | 1882 | io->io_setup = ipmi_si_port_setup; |
f6296bdc | 1883 | } else if (io->addr_space == IPMI_MEM_ADDR_SPACE) { |
58e27635 | 1884 | io->io_setup = ipmi_si_mem_setup; |
e1eeb7f8 CM |
1885 | } else { |
1886 | return -EINVAL; | |
1887 | } | |
1888 | } | |
1889 | ||
67f4fb02 | 1890 | new_smi = kzalloc(sizeof(*new_smi), GFP_KERNEL); |
bb398a4c CM |
1891 | if (!new_smi) |
1892 | return -ENOMEM; | |
67f4fb02 | 1893 | spin_lock_init(&new_smi->si_lock); |
bb398a4c CM |
1894 | |
1895 | new_smi->io = *io; | |
1896 | ||
d6dfd131 | 1897 | mutex_lock(&smi_infos_lock); |
7e030d6d CM |
1898 | dup = find_dup_si(new_smi); |
1899 | if (dup) { | |
910840f2 CM |
1900 | if (new_smi->io.addr_source == SI_ACPI && |
1901 | dup->io.addr_source == SI_SMBIOS) { | |
7e030d6d | 1902 | /* We prefer ACPI over SMBIOS. */ |
910840f2 | 1903 | dev_info(dup->io.dev, |
7e030d6d | 1904 | "Removing SMBIOS-specified %s state machine in favor of ACPI\n", |
910840f2 | 1905 | si_to_str[new_smi->io.si_type]); |
7e030d6d CM |
1906 | cleanup_one_si(dup); |
1907 | } else { | |
910840f2 | 1908 | dev_info(new_smi->io.dev, |
7e030d6d | 1909 | "%s-specified %s state machine: duplicate\n", |
910840f2 CM |
1910 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1911 | si_to_str[new_smi->io.si_type]); | |
7e030d6d | 1912 | rv = -EBUSY; |
c0a32fe1 | 1913 | kfree(new_smi); |
7e030d6d CM |
1914 | goto out_err; |
1915 | } | |
b0defcdb | 1916 | } |
1da177e4 | 1917 | |
25880f7d | 1918 | pr_info("Adding %s-specified %s state machine\n", |
910840f2 CM |
1919 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1920 | si_to_str[new_smi->io.si_type]); | |
2407d77a | 1921 | |
2407d77a MG |
1922 | list_add_tail(&new_smi->link, &smi_infos); |
1923 | ||
93c303d2 | 1924 | if (initialized) |
bb398a4c | 1925 | rv = try_smi_init(new_smi); |
2407d77a MG |
1926 | out_err: |
1927 | mutex_unlock(&smi_infos_lock); | |
1928 | return rv; | |
1929 | } | |
1930 | ||
3f724c40 TC |
1931 | /* |
1932 | * Try to start up an interface. Must be called with smi_infos_lock | |
1933 | * held, primarily to keep smi_num consistent, we only one to do these | |
1934 | * one at a time. | |
1935 | */ | |
2407d77a MG |
1936 | static int try_smi_init(struct smi_info *new_smi) |
1937 | { | |
1938 | int rv = 0; | |
1939 | int i; | |
1abf71ee | 1940 | char *init_name = NULL; |
2407d77a | 1941 | |
25880f7d | 1942 | pr_info("Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n", |
910840f2 CM |
1943 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
1944 | si_to_str[new_smi->io.si_type], | |
f6296bdc | 1945 | addr_space_to_str[new_smi->io.addr_space], |
bb2a08c0 | 1946 | new_smi->io.addr_data, |
910840f2 | 1947 | new_smi->io.slave_addr, new_smi->io.irq); |
2407d77a | 1948 | |
910840f2 | 1949 | switch (new_smi->io.si_type) { |
b0defcdb | 1950 | case SI_KCS: |
1da177e4 | 1951 | new_smi->handlers = &kcs_smi_handlers; |
b0defcdb CM |
1952 | break; |
1953 | ||
1954 | case SI_SMIC: | |
1da177e4 | 1955 | new_smi->handlers = &smic_smi_handlers; |
b0defcdb CM |
1956 | break; |
1957 | ||
1958 | case SI_BT: | |
1da177e4 | 1959 | new_smi->handlers = &bt_smi_handlers; |
b0defcdb CM |
1960 | break; |
1961 | ||
1962 | default: | |
1da177e4 LT |
1963 | /* No support for anything else yet. */ |
1964 | rv = -EIO; | |
1965 | goto out_err; | |
1966 | } | |
1967 | ||
57bccb4e | 1968 | new_smi->si_num = smi_num; |
3f724c40 | 1969 | |
1abf71ee | 1970 | /* Do this early so it's available for logs. */ |
910840f2 | 1971 | if (!new_smi->io.dev) { |
3f724c40 | 1972 | init_name = kasprintf(GFP_KERNEL, "ipmi_si.%d", |
57bccb4e | 1973 | new_smi->si_num); |
1abf71ee CM |
1974 | |
1975 | /* | |
1976 | * If we don't already have a device from something | |
1977 | * else (like PCI), then register a new one. | |
1978 | */ | |
1979 | new_smi->pdev = platform_device_alloc("ipmi_si", | |
57bccb4e | 1980 | new_smi->si_num); |
1abf71ee | 1981 | if (!new_smi->pdev) { |
25880f7d | 1982 | pr_err("Unable to allocate platform device\n"); |
532ed926 | 1983 | rv = -ENOMEM; |
1abf71ee CM |
1984 | goto out_err; |
1985 | } | |
910840f2 | 1986 | new_smi->io.dev = &new_smi->pdev->dev; |
9d70029e | 1987 | new_smi->io.dev->driver = &ipmi_platform_driver.driver; |
1abf71ee | 1988 | /* Nulled by device_add() */ |
910840f2 | 1989 | new_smi->io.dev->init_name = init_name; |
1abf71ee CM |
1990 | } |
1991 | ||
1da177e4 LT |
1992 | /* Allocate the state machine's data and initialize it. */ |
1993 | new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL); | |
b0defcdb | 1994 | if (!new_smi->si_sm) { |
1da177e4 LT |
1995 | rv = -ENOMEM; |
1996 | goto out_err; | |
1997 | } | |
e1eeb7f8 CM |
1998 | new_smi->io.io_size = new_smi->handlers->init_data(new_smi->si_sm, |
1999 | &new_smi->io); | |
1da177e4 LT |
2000 | |
2001 | /* Now that we know the I/O size, we can set up the I/O. */ | |
e1eeb7f8 | 2002 | rv = new_smi->io.io_setup(&new_smi->io); |
1da177e4 | 2003 | if (rv) { |
910840f2 | 2004 | dev_err(new_smi->io.dev, "Could not set up I/O space\n"); |
1da177e4 LT |
2005 | goto out_err; |
2006 | } | |
2007 | ||
1da177e4 LT |
2008 | /* Do low-level detection first. */ |
2009 | if (new_smi->handlers->detect(new_smi->si_sm)) { | |
910840f2 CM |
2010 | if (new_smi->io.addr_source) |
2011 | dev_err(new_smi->io.dev, | |
2012 | "Interface detection failed\n"); | |
1da177e4 LT |
2013 | rv = -ENODEV; |
2014 | goto out_err; | |
2015 | } | |
2016 | ||
c305e3d3 CM |
2017 | /* |
2018 | * Attempt a get device id command. If it fails, we probably | |
2019 | * don't have a BMC here. | |
2020 | */ | |
1da177e4 | 2021 | rv = try_get_dev_id(new_smi); |
b0defcdb | 2022 | if (rv) { |
910840f2 CM |
2023 | if (new_smi->io.addr_source) |
2024 | dev_err(new_smi->io.dev, | |
2025 | "There appears to be no BMC at this location\n"); | |
1da177e4 | 2026 | goto out_err; |
b0defcdb | 2027 | } |
1da177e4 | 2028 | |
3ae0e0f9 | 2029 | setup_oem_data_handler(new_smi); |
ea94027b | 2030 | setup_xaction_handlers(new_smi); |
d0882897 | 2031 | check_for_broken_irqs(new_smi); |
3ae0e0f9 | 2032 | |
b874b985 | 2033 | new_smi->waiting_msg = NULL; |
1da177e4 LT |
2034 | new_smi->curr_msg = NULL; |
2035 | atomic_set(&new_smi->req_events, 0); | |
7aefac26 | 2036 | new_smi->run_to_completion = false; |
64959e2d CM |
2037 | for (i = 0; i < SI_NUM_STATS; i++) |
2038 | atomic_set(&new_smi->stats[i], 0); | |
1da177e4 | 2039 | |
7aefac26 | 2040 | new_smi->interrupt_disabled = true; |
89986496 | 2041 | atomic_set(&new_smi->need_watch, 0); |
1da177e4 | 2042 | |
40112ae7 CM |
2043 | rv = try_enable_event_buffer(new_smi); |
2044 | if (rv == 0) | |
7aefac26 | 2045 | new_smi->has_event_buffer = true; |
40112ae7 | 2046 | |
c305e3d3 CM |
2047 | /* |
2048 | * Start clearing the flags before we enable interrupts or the | |
2049 | * timer to avoid racing with the timer. | |
2050 | */ | |
4f7f5551 | 2051 | start_clear_flags(new_smi); |
d9b7e4f7 CM |
2052 | |
2053 | /* | |
2054 | * IRQ is defined to be set when non-zero. req_events will | |
2055 | * cause a global flags check that will enable interrupts. | |
2056 | */ | |
910840f2 | 2057 | if (new_smi->io.irq) { |
d9b7e4f7 CM |
2058 | new_smi->interrupt_disabled = false; |
2059 | atomic_set(&new_smi->req_events, 1); | |
2060 | } | |
1da177e4 | 2061 | |
71404a2f | 2062 | if (new_smi->pdev && !new_smi->pdev_registered) { |
b48f5457 | 2063 | rv = platform_device_add(new_smi->pdev); |
50c812b2 | 2064 | if (rv) { |
910840f2 | 2065 | dev_err(new_smi->io.dev, |
bb2a08c0 CM |
2066 | "Unable to register system interface device: %d\n", |
2067 | rv); | |
453823ba | 2068 | goto out_err; |
50c812b2 | 2069 | } |
71404a2f | 2070 | new_smi->pdev_registered = true; |
50c812b2 CM |
2071 | } |
2072 | ||
3dd377b5 CM |
2073 | dev_set_drvdata(new_smi->io.dev, new_smi); |
2074 | rv = device_add_group(new_smi->io.dev, &ipmi_si_dev_attr_group); | |
2075 | if (rv) { | |
2076 | dev_err(new_smi->io.dev, | |
2077 | "Unable to add device attributes: error %d\n", | |
2078 | rv); | |
71404a2f | 2079 | goto out_err; |
3dd377b5 | 2080 | } |
cc095f0a | 2081 | new_smi->dev_group_added = true; |
3dd377b5 | 2082 | |
1da177e4 LT |
2083 | rv = ipmi_register_smi(&handlers, |
2084 | new_smi, | |
910840f2 CM |
2085 | new_smi->io.dev, |
2086 | new_smi->io.slave_addr); | |
1da177e4 | 2087 | if (rv) { |
910840f2 CM |
2088 | dev_err(new_smi->io.dev, |
2089 | "Unable to register device: error %d\n", | |
279fbd0c | 2090 | rv); |
71404a2f | 2091 | goto out_err; |
1da177e4 LT |
2092 | } |
2093 | ||
3f724c40 TC |
2094 | /* Don't increment till we know we have succeeded. */ |
2095 | smi_num++; | |
2096 | ||
910840f2 CM |
2097 | dev_info(new_smi->io.dev, "IPMI %s interface initialized\n", |
2098 | si_to_str[new_smi->io.si_type]); | |
1da177e4 | 2099 | |
910840f2 | 2100 | WARN_ON(new_smi->io.dev->init_name != NULL); |
b0defcdb | 2101 | |
2512e40e | 2102 | out_err: |
401e7e88 YY |
2103 | if (rv && new_smi->io.io_cleanup) { |
2104 | new_smi->io.io_cleanup(&new_smi->io); | |
2105 | new_smi->io.io_cleanup = NULL; | |
2106 | } | |
2107 | ||
1abf71ee | 2108 | kfree(init_name); |
1da177e4 LT |
2109 | return rv; |
2110 | } | |
2111 | ||
41b766d6 | 2112 | static int __init init_ipmi_si(void) |
1da177e4 | 2113 | { |
2407d77a | 2114 | struct smi_info *e; |
06ee4594 | 2115 | enum ipmi_addr_src type = SI_INVALID; |
1da177e4 LT |
2116 | |
2117 | if (initialized) | |
2118 | return 0; | |
1da177e4 | 2119 | |
41b766d6 | 2120 | ipmi_hardcode_init(); |
1da177e4 | 2121 | |
41b766d6 | 2122 | pr_info("IPMI System Interface driver\n"); |
d8cc5267 | 2123 | |
9d70029e CM |
2124 | ipmi_si_platform_init(); |
2125 | ||
13d0b35c | 2126 | ipmi_si_pci_init(); |
b0defcdb | 2127 | |
c6f85a75 | 2128 | ipmi_si_parisc_init(); |
fdbeb7de | 2129 | |
06ee4594 MG |
2130 | /* We prefer devices with interrupts, but in the case of a machine |
2131 | with multiple BMCs we assume that there will be several instances | |
2132 | of a given type so if we succeed in registering a type then also | |
2133 | try to register everything else of the same type */ | |
2407d77a MG |
2134 | mutex_lock(&smi_infos_lock); |
2135 | list_for_each_entry(e, &smi_infos, link) { | |
06ee4594 MG |
2136 | /* Try to register a device if it has an IRQ and we either |
2137 | haven't successfully registered a device yet or this | |
2138 | device has the same type as one we successfully registered */ | |
910840f2 | 2139 | if (e->io.irq && (!type || e->io.addr_source == type)) { |
d8cc5267 | 2140 | if (!try_smi_init(e)) { |
910840f2 | 2141 | type = e->io.addr_source; |
d8cc5267 MG |
2142 | } |
2143 | } | |
2144 | } | |
2145 | ||
06ee4594 | 2146 | /* type will only have been set if we successfully registered an si */ |
bb398a4c CM |
2147 | if (type) |
2148 | goto skip_fallback_noirq; | |
06ee4594 | 2149 | |
d8cc5267 MG |
2150 | /* Fall back to the preferred device */ |
2151 | ||
2152 | list_for_each_entry(e, &smi_infos, link) { | |
910840f2 | 2153 | if (!e->io.irq && (!type || e->io.addr_source == type)) { |
d8cc5267 | 2154 | if (!try_smi_init(e)) { |
910840f2 | 2155 | type = e->io.addr_source; |
d8cc5267 MG |
2156 | } |
2157 | } | |
2407d77a | 2158 | } |
bb398a4c CM |
2159 | |
2160 | skip_fallback_noirq: | |
2161 | initialized = 1; | |
2407d77a MG |
2162 | mutex_unlock(&smi_infos_lock); |
2163 | ||
06ee4594 MG |
2164 | if (type) |
2165 | return 0; | |
2166 | ||
d6dfd131 | 2167 | mutex_lock(&smi_infos_lock); |
b361e27b | 2168 | if (unload_when_empty && list_empty(&smi_infos)) { |
d6dfd131 | 2169 | mutex_unlock(&smi_infos_lock); |
d2478521 | 2170 | cleanup_ipmi_si(); |
25880f7d | 2171 | pr_warn("Unable to find any System Interface(s)\n"); |
1da177e4 | 2172 | return -ENODEV; |
b0defcdb | 2173 | } else { |
d6dfd131 | 2174 | mutex_unlock(&smi_infos_lock); |
b0defcdb | 2175 | return 0; |
1da177e4 | 2176 | } |
1da177e4 LT |
2177 | } |
2178 | module_init(init_ipmi_si); | |
2179 | ||
7960f18a | 2180 | static void shutdown_smi(void *send_info) |
1da177e4 | 2181 | { |
7960f18a | 2182 | struct smi_info *smi_info = send_info; |
b874b985 | 2183 | |
71404a2f CM |
2184 | if (smi_info->dev_group_added) { |
2185 | device_remove_group(smi_info->io.dev, &ipmi_si_dev_attr_group); | |
2186 | smi_info->dev_group_added = false; | |
2187 | } | |
2188 | if (smi_info->io.dev) | |
2189 | dev_set_drvdata(smi_info->io.dev, NULL); | |
b0defcdb | 2190 | |
c305e3d3 | 2191 | /* |
b874b985 CM |
2192 | * Make sure that interrupts, the timer and the thread are |
2193 | * stopped and will not run again. | |
c305e3d3 | 2194 | */ |
71404a2f CM |
2195 | smi_info->interrupt_disabled = true; |
2196 | if (smi_info->io.irq_cleanup) { | |
2197 | smi_info->io.irq_cleanup(&smi_info->io); | |
2198 | smi_info->io.irq_cleanup = NULL; | |
2199 | } | |
2200 | stop_timer_and_thread(smi_info); | |
2201 | ||
2202 | /* | |
2203 | * Wait until we know that we are out of any interrupt | |
2204 | * handlers might have been running before we freed the | |
2205 | * interrupt. | |
2206 | */ | |
17c0eb74 | 2207 | synchronize_rcu(); |
1da177e4 | 2208 | |
c305e3d3 CM |
2209 | /* |
2210 | * Timeouts are stopped, now make sure the interrupts are off | |
b874b985 CM |
2211 | * in the BMC. Note that timers and CPU interrupts are off, |
2212 | * so no need for locks. | |
c305e3d3 | 2213 | */ |
71404a2f CM |
2214 | while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) { |
2215 | poll(smi_info); | |
ee6cd5f8 | 2216 | schedule_timeout_uninterruptible(1); |
ee6cd5f8 | 2217 | } |
71404a2f CM |
2218 | if (smi_info->handlers) |
2219 | disable_si_irq(smi_info); | |
2220 | while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) { | |
2221 | poll(smi_info); | |
da4cd8df | 2222 | schedule_timeout_uninterruptible(1); |
1da177e4 | 2223 | } |
71404a2f CM |
2224 | if (smi_info->handlers) |
2225 | smi_info->handlers->cleanup(smi_info->si_sm); | |
2226 | ||
2227 | if (smi_info->io.addr_source_cleanup) { | |
2228 | smi_info->io.addr_source_cleanup(&smi_info->io); | |
2229 | smi_info->io.addr_source_cleanup = NULL; | |
2230 | } | |
2231 | if (smi_info->io.io_cleanup) { | |
2232 | smi_info->io.io_cleanup(&smi_info->io); | |
2233 | smi_info->io.io_cleanup = NULL; | |
2234 | } | |
1da177e4 | 2235 | |
71404a2f CM |
2236 | kfree(smi_info->si_sm); |
2237 | smi_info->si_sm = NULL; | |
2512e40e CM |
2238 | |
2239 | smi_info->intf = NULL; | |
71404a2f CM |
2240 | } |
2241 | ||
93c303d2 CM |
2242 | /* |
2243 | * Must be called with smi_infos_lock held, to serialize the | |
2244 | * smi_info->intf check. | |
2245 | */ | |
71404a2f CM |
2246 | static void cleanup_one_si(struct smi_info *smi_info) |
2247 | { | |
2248 | if (!smi_info) | |
2249 | return; | |
1da177e4 | 2250 | |
71404a2f | 2251 | list_del(&smi_info->link); |
1da177e4 | 2252 | |
2512e40e | 2253 | if (smi_info->intf) |
93c303d2 | 2254 | ipmi_unregister_smi(smi_info->intf); |
50c812b2 | 2255 | |
71404a2f CM |
2256 | if (smi_info->pdev) { |
2257 | if (smi_info->pdev_registered) | |
2258 | platform_device_unregister(smi_info->pdev); | |
2259 | else | |
2260 | platform_device_put(smi_info->pdev); | |
2261 | } | |
50c812b2 | 2262 | |
71404a2f | 2263 | kfree(smi_info); |
1da177e4 LT |
2264 | } |
2265 | ||
bb398a4c CM |
2266 | int ipmi_si_remove_by_dev(struct device *dev) |
2267 | { | |
2268 | struct smi_info *e; | |
2269 | int rv = -ENOENT; | |
2270 | ||
2271 | mutex_lock(&smi_infos_lock); | |
2272 | list_for_each_entry(e, &smi_infos, link) { | |
2273 | if (e->io.dev == dev) { | |
2274 | cleanup_one_si(e); | |
2275 | rv = 0; | |
2276 | break; | |
2277 | } | |
2278 | } | |
2279 | mutex_unlock(&smi_infos_lock); | |
2280 | ||
2281 | return rv; | |
2282 | } | |
2283 | ||
44814ec9 CM |
2284 | void ipmi_si_remove_by_data(int addr_space, enum si_type si_type, |
2285 | unsigned long addr) | |
2286 | { | |
2287 | /* remove */ | |
2288 | struct smi_info *e, *tmp_e; | |
2289 | ||
2290 | mutex_lock(&smi_infos_lock); | |
2291 | list_for_each_entry_safe(e, tmp_e, &smi_infos, link) { | |
f6296bdc | 2292 | if (e->io.addr_space != addr_space) |
44814ec9 CM |
2293 | continue; |
2294 | if (e->io.si_type != si_type) | |
2295 | continue; | |
2296 | if (e->io.addr_data == addr) | |
2297 | cleanup_one_si(e); | |
2298 | } | |
2299 | mutex_unlock(&smi_infos_lock); | |
2300 | } | |
2301 | ||
0dcf334c | 2302 | static void cleanup_ipmi_si(void) |
1da177e4 | 2303 | { |
b0defcdb | 2304 | struct smi_info *e, *tmp_e; |
1da177e4 | 2305 | |
b0defcdb | 2306 | if (!initialized) |
1da177e4 LT |
2307 | return; |
2308 | ||
13d0b35c | 2309 | ipmi_si_pci_shutdown(); |
c6f85a75 CM |
2310 | |
2311 | ipmi_si_parisc_shutdown(); | |
b0defcdb | 2312 | |
9d70029e | 2313 | ipmi_si_platform_shutdown(); |
dba9b4f6 | 2314 | |
d6dfd131 | 2315 | mutex_lock(&smi_infos_lock); |
b0defcdb CM |
2316 | list_for_each_entry_safe(e, tmp_e, &smi_infos, link) |
2317 | cleanup_one_si(e); | |
d6dfd131 | 2318 | mutex_unlock(&smi_infos_lock); |
41b766d6 CM |
2319 | |
2320 | ipmi_si_hardcode_exit(); | |
1da177e4 LT |
2321 | } |
2322 | module_exit(cleanup_ipmi_si); | |
2323 | ||
0944d889 | 2324 | MODULE_ALIAS("platform:dmi-ipmi-si"); |
1da177e4 | 2325 | MODULE_LICENSE("GPL"); |
1fdd75bd | 2326 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
c305e3d3 CM |
2327 | MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT" |
2328 | " system interfaces."); |