4 * The interface to the IPMI driver for the system interfaces (KCS, SMIC,
7 * Author: MontaVista Software, Inc.
8 * Corey Minyard <minyard@mvista.com>
11 * Copyright 2002 MontaVista Software Inc.
12 * Copyright 2006 IBM Corp., Christian Krafft <krafft@de.ibm.com>
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the License, or (at your
17 * option) any later version.
20 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
21 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
26 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
28 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
29 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 * You should have received a copy of the GNU General Public License along
32 * with this program; if not, write to the Free Software Foundation, Inc.,
33 * 675 Mass Ave, Cambridge, MA 02139, USA.
37 * This file holds the "policy" for the interface to the SMI state
38 * machine. It does the configuration, handles timers and interrupts,
39 * and drives the real SMI state machine.
42 #include <linux/module.h>
43 #include <linux/moduleparam.h>
44 #include <linux/sched.h>
45 #include <linux/seq_file.h>
46 #include <linux/timer.h>
47 #include <linux/errno.h>
48 #include <linux/spinlock.h>
49 #include <linux/slab.h>
50 #include <linux/delay.h>
51 #include <linux/list.h>
52 #include <linux/notifier.h>
53 #include <linux/mutex.h>
54 #include <linux/kthread.h>
56 #include <linux/interrupt.h>
57 #include <linux/rcupdate.h>
58 #include <linux/ipmi.h>
59 #include <linux/ipmi_smi.h>
61 #include <linux/string.h>
62 #include <linux/ctype.h>
64 #define PFX "ipmi_si: "
66 /* Measure times between events in the driver. */
69 /* Call every 10 ms. */
70 #define SI_TIMEOUT_TIME_USEC 10000
71 #define SI_USEC_PER_JIFFY (1000000/HZ)
72 #define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY)
73 #define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a
84 /* FIXME - add watchdog stuff. */
87 /* Some BT-specific defines we need here. */
88 #define IPMI_BT_INTMASK_REG 2
89 #define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2
90 #define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1
92 static const char * const si_to_str[] = { "invalid", "kcs", "smic", "bt" };
94 static int initialized;
97 * Indexes into stats[] in smi_info below.
99 enum si_stat_indexes {
101 * Number of times the driver requested a timer while an operation
104 SI_STAT_short_timeouts = 0,
107 * Number of times the driver requested a timer while nothing was in
110 SI_STAT_long_timeouts,
112 /* Number of times the interface was idle while being polled. */
115 /* Number of interrupts the driver handled. */
118 /* Number of time the driver got an ATTN from the hardware. */
121 /* Number of times the driver requested flags from the hardware. */
122 SI_STAT_flag_fetches,
124 /* Number of times the hardware didn't follow the state machine. */
127 /* Number of completed messages. */
128 SI_STAT_complete_transactions,
130 /* Number of IPMI events received from the hardware. */
133 /* Number of watchdog pretimeouts. */
134 SI_STAT_watchdog_pretimeouts,
136 /* Number of asynchronous messages received. */
137 SI_STAT_incoming_messages,
140 /* This *must* remain last, add new values above this. */
147 struct si_sm_data *si_sm;
148 const struct si_sm_handlers *handlers;
150 struct ipmi_smi_msg *waiting_msg;
151 struct ipmi_smi_msg *curr_msg;
152 enum si_intf_state si_state;
155 * Used to handle the various types of I/O that can occur with
161 * Per-OEM handler, called from handle_flags(). Returns 1
162 * when handle_flags() needs to be re-run or 0 indicating it
163 * set si_state itself.
165 int (*oem_data_avail_handler)(struct smi_info *smi_info);
168 * Flags from the last GET_MSG_FLAGS command, used when an ATTN
169 * is set to hold the flags until we are done handling everything
172 #define RECEIVE_MSG_AVAIL 0x01
173 #define EVENT_MSG_BUFFER_FULL 0x02
174 #define WDT_PRE_TIMEOUT_INT 0x08
175 #define OEM0_DATA_AVAIL 0x20
176 #define OEM1_DATA_AVAIL 0x40
177 #define OEM2_DATA_AVAIL 0x80
178 #define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \
181 unsigned char msg_flags;
183 /* Does the BMC have an event buffer? */
184 bool has_event_buffer;
187 * If set to true, this will request events the next time the
188 * state machine is idle.
193 * If true, run the state machine to completion on every send
194 * call. Generally used after a panic to make sure stuff goes
197 bool run_to_completion;
199 /* The timer for this si. */
200 struct timer_list si_timer;
202 /* This flag is set, if the timer is running (timer_pending() isn't enough) */
205 /* The time (in jiffies) the last timeout occurred at. */
206 unsigned long last_timeout_jiffies;
208 /* Are we waiting for the events, pretimeouts, received msgs? */
212 * The driver will disable interrupts when it gets into a
213 * situation where it cannot handle messages due to lack of
214 * memory. Once that situation clears up, it will re-enable
217 bool interrupt_disabled;
220 * Does the BMC support events?
222 bool supports_event_msg_buff;
225 * Can we disable interrupts the global enables receive irq
226 * bit? There are currently two forms of brokenness, some
227 * systems cannot disable the bit (which is technically within
228 * the spec but a bad idea) and some systems have the bit
229 * forced to zero even though interrupts work (which is
230 * clearly outside the spec). The next bool tells which form
231 * of brokenness is present.
233 bool cannot_disable_irq;
236 * Some systems are broken and cannot set the irq enable
237 * bit, even if they support interrupts.
239 bool irq_enable_broken;
242 * Did we get an attention that we did not handle?
246 /* From the get device id response... */
247 struct ipmi_device_id device_id;
249 /* Default driver model device. */
250 struct platform_device *pdev;
252 /* Counters and things for the proc filesystem. */
253 atomic_t stats[SI_NUM_STATS];
255 struct task_struct *thread;
257 struct list_head link;
260 #define smi_inc_stat(smi, stat) \
261 atomic_inc(&(smi)->stats[SI_STAT_ ## stat])
262 #define smi_get_stat(smi, stat) \
263 ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat]))
265 #define IPMI_MAX_INTFS 4
266 static int force_kipmid[IPMI_MAX_INTFS];
267 static int num_force_kipmid;
269 static unsigned int kipmid_max_busy_us[IPMI_MAX_INTFS];
270 static int num_max_busy_us;
272 static bool unload_when_empty = true;
274 static int try_smi_init(struct smi_info *smi);
275 static void cleanup_one_si(struct smi_info *to_clean);
276 static void cleanup_ipmi_si(void);
279 void debug_timestamp(char *msg)
283 getnstimeofday64(&t);
284 pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) t.tv_sec, t.tv_nsec);
287 #define debug_timestamp(x)
290 static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list);
291 static int register_xaction_notifier(struct notifier_block *nb)
293 return atomic_notifier_chain_register(&xaction_notifier_list, nb);
296 static void deliver_recv_msg(struct smi_info *smi_info,
297 struct ipmi_smi_msg *msg)
299 /* Deliver the message to the upper layer. */
301 ipmi_smi_msg_received(smi_info->intf, msg);
303 ipmi_free_smi_msg(msg);
306 static void return_hosed_msg(struct smi_info *smi_info, int cCode)
308 struct ipmi_smi_msg *msg = smi_info->curr_msg;
310 if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED)
311 cCode = IPMI_ERR_UNSPECIFIED;
312 /* else use it as is */
314 /* Make it a response */
315 msg->rsp[0] = msg->data[0] | 4;
316 msg->rsp[1] = msg->data[1];
320 smi_info->curr_msg = NULL;
321 deliver_recv_msg(smi_info, msg);
324 static enum si_sm_result start_next_msg(struct smi_info *smi_info)
328 if (!smi_info->waiting_msg) {
329 smi_info->curr_msg = NULL;
334 smi_info->curr_msg = smi_info->waiting_msg;
335 smi_info->waiting_msg = NULL;
336 debug_timestamp("Start2");
337 err = atomic_notifier_call_chain(&xaction_notifier_list,
339 if (err & NOTIFY_STOP_MASK) {
340 rv = SI_SM_CALL_WITHOUT_DELAY;
343 err = smi_info->handlers->start_transaction(
345 smi_info->curr_msg->data,
346 smi_info->curr_msg->data_size);
348 return_hosed_msg(smi_info, err);
350 rv = SI_SM_CALL_WITHOUT_DELAY;
356 static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val)
358 smi_info->last_timeout_jiffies = jiffies;
359 mod_timer(&smi_info->si_timer, new_val);
360 smi_info->timer_running = true;
364 * Start a new message and (re)start the timer and thread.
366 static void start_new_msg(struct smi_info *smi_info, unsigned char *msg,
369 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
371 if (smi_info->thread)
372 wake_up_process(smi_info->thread);
374 smi_info->handlers->start_transaction(smi_info->si_sm, msg, size);
377 static void start_check_enables(struct smi_info *smi_info, bool start_timer)
379 unsigned char msg[2];
381 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
382 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
385 start_new_msg(smi_info, msg, 2);
387 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
388 smi_info->si_state = SI_CHECKING_ENABLES;
391 static void start_clear_flags(struct smi_info *smi_info, bool start_timer)
393 unsigned char msg[3];
395 /* Make sure the watchdog pre-timeout flag is not set at startup. */
396 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
397 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
398 msg[2] = WDT_PRE_TIMEOUT_INT;
401 start_new_msg(smi_info, msg, 3);
403 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
404 smi_info->si_state = SI_CLEARING_FLAGS;
407 static void start_getting_msg_queue(struct smi_info *smi_info)
409 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
410 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD;
411 smi_info->curr_msg->data_size = 2;
413 start_new_msg(smi_info, smi_info->curr_msg->data,
414 smi_info->curr_msg->data_size);
415 smi_info->si_state = SI_GETTING_MESSAGES;
418 static void start_getting_events(struct smi_info *smi_info)
420 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
421 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
422 smi_info->curr_msg->data_size = 2;
424 start_new_msg(smi_info, smi_info->curr_msg->data,
425 smi_info->curr_msg->data_size);
426 smi_info->si_state = SI_GETTING_EVENTS;
430 * When we have a situtaion where we run out of memory and cannot
431 * allocate messages, we just leave them in the BMC and run the system
432 * polled until we can allocate some memory. Once we have some
433 * memory, we will re-enable the interrupt.
435 * Note that we cannot just use disable_irq(), since the interrupt may
438 static inline bool disable_si_irq(struct smi_info *smi_info, bool start_timer)
440 if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) {
441 smi_info->interrupt_disabled = true;
442 start_check_enables(smi_info, start_timer);
448 static inline bool enable_si_irq(struct smi_info *smi_info)
450 if ((smi_info->io.irq) && (smi_info->interrupt_disabled)) {
451 smi_info->interrupt_disabled = false;
452 start_check_enables(smi_info, true);
459 * Allocate a message. If unable to allocate, start the interrupt
460 * disable process and return NULL. If able to allocate but
461 * interrupts are disabled, free the message and return NULL after
462 * starting the interrupt enable process.
464 static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info)
466 struct ipmi_smi_msg *msg;
468 msg = ipmi_alloc_smi_msg();
470 if (!disable_si_irq(smi_info, true))
471 smi_info->si_state = SI_NORMAL;
472 } else if (enable_si_irq(smi_info)) {
473 ipmi_free_smi_msg(msg);
479 static void handle_flags(struct smi_info *smi_info)
482 if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
483 /* Watchdog pre-timeout */
484 smi_inc_stat(smi_info, watchdog_pretimeouts);
486 start_clear_flags(smi_info, true);
487 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
489 ipmi_smi_watchdog_pretimeout(smi_info->intf);
490 } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) {
491 /* Messages available. */
492 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
493 if (!smi_info->curr_msg)
496 start_getting_msg_queue(smi_info);
497 } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) {
498 /* Events available. */
499 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
500 if (!smi_info->curr_msg)
503 start_getting_events(smi_info);
504 } else if (smi_info->msg_flags & OEM_DATA_AVAIL &&
505 smi_info->oem_data_avail_handler) {
506 if (smi_info->oem_data_avail_handler(smi_info))
509 smi_info->si_state = SI_NORMAL;
513 * Global enables we care about.
515 #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
516 IPMI_BMC_EVT_MSG_INTR)
518 static u8 current_global_enables(struct smi_info *smi_info, u8 base,
523 if (smi_info->supports_event_msg_buff)
524 enables |= IPMI_BMC_EVT_MSG_BUFF;
526 if (((smi_info->io.irq && !smi_info->interrupt_disabled) ||
527 smi_info->cannot_disable_irq) &&
528 !smi_info->irq_enable_broken)
529 enables |= IPMI_BMC_RCV_MSG_INTR;
531 if (smi_info->supports_event_msg_buff &&
532 smi_info->io.irq && !smi_info->interrupt_disabled &&
533 !smi_info->irq_enable_broken)
534 enables |= IPMI_BMC_EVT_MSG_INTR;
536 *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR);
541 static void check_bt_irq(struct smi_info *smi_info, bool irq_on)
543 u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG);
545 irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT;
547 if ((bool)irqstate == irq_on)
551 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
552 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
554 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0);
557 static void handle_transaction_done(struct smi_info *smi_info)
559 struct ipmi_smi_msg *msg;
561 debug_timestamp("Done");
562 switch (smi_info->si_state) {
564 if (!smi_info->curr_msg)
567 smi_info->curr_msg->rsp_size
568 = smi_info->handlers->get_result(
570 smi_info->curr_msg->rsp,
571 IPMI_MAX_MSG_LENGTH);
574 * Do this here becase deliver_recv_msg() releases the
575 * lock, and a new message can be put in during the
576 * time the lock is released.
578 msg = smi_info->curr_msg;
579 smi_info->curr_msg = NULL;
580 deliver_recv_msg(smi_info, msg);
583 case SI_GETTING_FLAGS:
585 unsigned char msg[4];
588 /* We got the flags from the SMI, now handle them. */
589 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
591 /* Error fetching flags, just give up for now. */
592 smi_info->si_state = SI_NORMAL;
593 } else if (len < 4) {
595 * Hmm, no flags. That's technically illegal, but
596 * don't use uninitialized data.
598 smi_info->si_state = SI_NORMAL;
600 smi_info->msg_flags = msg[3];
601 handle_flags(smi_info);
606 case SI_CLEARING_FLAGS:
608 unsigned char msg[3];
610 /* We cleared the flags. */
611 smi_info->handlers->get_result(smi_info->si_sm, msg, 3);
613 /* Error clearing flags */
614 dev_warn(smi_info->io.dev,
615 "Error clearing flags: %2.2x\n", msg[2]);
617 smi_info->si_state = SI_NORMAL;
621 case SI_GETTING_EVENTS:
623 smi_info->curr_msg->rsp_size
624 = smi_info->handlers->get_result(
626 smi_info->curr_msg->rsp,
627 IPMI_MAX_MSG_LENGTH);
630 * Do this here becase deliver_recv_msg() releases the
631 * lock, and a new message can be put in during the
632 * time the lock is released.
634 msg = smi_info->curr_msg;
635 smi_info->curr_msg = NULL;
636 if (msg->rsp[2] != 0) {
637 /* Error getting event, probably done. */
640 /* Take off the event flag. */
641 smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
642 handle_flags(smi_info);
644 smi_inc_stat(smi_info, events);
647 * Do this before we deliver the message
648 * because delivering the message releases the
649 * lock and something else can mess with the
652 handle_flags(smi_info);
654 deliver_recv_msg(smi_info, msg);
659 case SI_GETTING_MESSAGES:
661 smi_info->curr_msg->rsp_size
662 = smi_info->handlers->get_result(
664 smi_info->curr_msg->rsp,
665 IPMI_MAX_MSG_LENGTH);
668 * Do this here becase deliver_recv_msg() releases the
669 * lock, and a new message can be put in during the
670 * time the lock is released.
672 msg = smi_info->curr_msg;
673 smi_info->curr_msg = NULL;
674 if (msg->rsp[2] != 0) {
675 /* Error getting event, probably done. */
678 /* Take off the msg flag. */
679 smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
680 handle_flags(smi_info);
682 smi_inc_stat(smi_info, incoming_messages);
685 * Do this before we deliver the message
686 * because delivering the message releases the
687 * lock and something else can mess with the
690 handle_flags(smi_info);
692 deliver_recv_msg(smi_info, msg);
697 case SI_CHECKING_ENABLES:
699 unsigned char msg[4];
703 /* We got the flags from the SMI, now handle them. */
704 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
706 dev_warn(smi_info->io.dev,
707 "Couldn't get irq info: %x.\n", msg[2]);
708 dev_warn(smi_info->io.dev,
709 "Maybe ok, but ipmi might run very slowly.\n");
710 smi_info->si_state = SI_NORMAL;
713 enables = current_global_enables(smi_info, 0, &irq_on);
714 if (smi_info->io.si_type == SI_BT)
715 /* BT has its own interrupt enable bit. */
716 check_bt_irq(smi_info, irq_on);
717 if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) {
718 /* Enables are not correct, fix them. */
719 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
720 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
721 msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK);
722 smi_info->handlers->start_transaction(
723 smi_info->si_sm, msg, 3);
724 smi_info->si_state = SI_SETTING_ENABLES;
725 } else if (smi_info->supports_event_msg_buff) {
726 smi_info->curr_msg = ipmi_alloc_smi_msg();
727 if (!smi_info->curr_msg) {
728 smi_info->si_state = SI_NORMAL;
731 start_getting_events(smi_info);
733 smi_info->si_state = SI_NORMAL;
738 case SI_SETTING_ENABLES:
740 unsigned char msg[4];
742 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
744 dev_warn(smi_info->io.dev,
745 "Could not set the global enables: 0x%x.\n",
748 if (smi_info->supports_event_msg_buff) {
749 smi_info->curr_msg = ipmi_alloc_smi_msg();
750 if (!smi_info->curr_msg) {
751 smi_info->si_state = SI_NORMAL;
754 start_getting_events(smi_info);
756 smi_info->si_state = SI_NORMAL;
764 * Called on timeouts and events. Timeouts should pass the elapsed
765 * time, interrupts should pass in zero. Must be called with
766 * si_lock held and interrupts disabled.
768 static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
771 enum si_sm_result si_sm_result;
775 * There used to be a loop here that waited a little while
776 * (around 25us) before giving up. That turned out to be
777 * pointless, the minimum delays I was seeing were in the 300us
778 * range, which is far too long to wait in an interrupt. So
779 * we just run until the state machine tells us something
780 * happened or it needs a delay.
782 si_sm_result = smi_info->handlers->event(smi_info->si_sm, time);
784 while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY)
785 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
787 if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) {
788 smi_inc_stat(smi_info, complete_transactions);
790 handle_transaction_done(smi_info);
792 } else if (si_sm_result == SI_SM_HOSED) {
793 smi_inc_stat(smi_info, hosed_count);
796 * Do the before return_hosed_msg, because that
799 smi_info->si_state = SI_NORMAL;
800 if (smi_info->curr_msg != NULL) {
802 * If we were handling a user message, format
803 * a response to send to the upper layer to
804 * tell it about the error.
806 return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED);
812 * We prefer handling attn over new messages. But don't do
813 * this if there is not yet an upper layer to handle anything.
815 if (likely(smi_info->intf) &&
816 (si_sm_result == SI_SM_ATTN || smi_info->got_attn)) {
817 unsigned char msg[2];
819 if (smi_info->si_state != SI_NORMAL) {
821 * We got an ATTN, but we are doing something else.
822 * Handle the ATTN later.
824 smi_info->got_attn = true;
826 smi_info->got_attn = false;
827 smi_inc_stat(smi_info, attentions);
830 * Got a attn, send down a get message flags to see
831 * what's causing it. It would be better to handle
832 * this in the upper layer, but due to the way
833 * interrupts work with the SMI, that's not really
836 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
837 msg[1] = IPMI_GET_MSG_FLAGS_CMD;
839 start_new_msg(smi_info, msg, 2);
840 smi_info->si_state = SI_GETTING_FLAGS;
845 /* If we are currently idle, try to start the next message. */
846 if (si_sm_result == SI_SM_IDLE) {
847 smi_inc_stat(smi_info, idles);
849 si_sm_result = start_next_msg(smi_info);
850 if (si_sm_result != SI_SM_IDLE)
854 if ((si_sm_result == SI_SM_IDLE)
855 && (atomic_read(&smi_info->req_events))) {
857 * We are idle and the upper layer requested that I fetch
860 atomic_set(&smi_info->req_events, 0);
863 * Take this opportunity to check the interrupt and
864 * message enable state for the BMC. The BMC can be
865 * asynchronously reset, and may thus get interrupts
866 * disable and messages disabled.
868 if (smi_info->supports_event_msg_buff || smi_info->io.irq) {
869 start_check_enables(smi_info, true);
871 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
872 if (!smi_info->curr_msg)
875 start_getting_events(smi_info);
880 if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) {
881 /* Ok it if fails, the timer will just go off. */
882 if (del_timer(&smi_info->si_timer))
883 smi_info->timer_running = false;
890 static void check_start_timer_thread(struct smi_info *smi_info)
892 if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
893 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
895 if (smi_info->thread)
896 wake_up_process(smi_info->thread);
898 start_next_msg(smi_info);
899 smi_event_handler(smi_info, 0);
903 static void flush_messages(void *send_info)
905 struct smi_info *smi_info = send_info;
906 enum si_sm_result result;
909 * Currently, this function is called only in run-to-completion
910 * mode. This means we are single-threaded, no need for locks.
912 result = smi_event_handler(smi_info, 0);
913 while (result != SI_SM_IDLE) {
914 udelay(SI_SHORT_TIMEOUT_USEC);
915 result = smi_event_handler(smi_info, SI_SHORT_TIMEOUT_USEC);
919 static void sender(void *send_info,
920 struct ipmi_smi_msg *msg)
922 struct smi_info *smi_info = send_info;
925 debug_timestamp("Enqueue");
927 if (smi_info->run_to_completion) {
929 * If we are running to completion, start it. Upper
930 * layer will call flush_messages to clear it out.
932 smi_info->waiting_msg = msg;
936 spin_lock_irqsave(&smi_info->si_lock, flags);
938 * The following two lines don't need to be under the lock for
939 * the lock's sake, but they do need SMP memory barriers to
940 * avoid getting things out of order. We are already claiming
941 * the lock, anyway, so just do it under the lock to avoid the
944 BUG_ON(smi_info->waiting_msg);
945 smi_info->waiting_msg = msg;
946 check_start_timer_thread(smi_info);
947 spin_unlock_irqrestore(&smi_info->si_lock, flags);
950 static void set_run_to_completion(void *send_info, bool i_run_to_completion)
952 struct smi_info *smi_info = send_info;
954 smi_info->run_to_completion = i_run_to_completion;
955 if (i_run_to_completion)
956 flush_messages(smi_info);
960 * Use -1 in the nsec value of the busy waiting timespec to tell that
961 * we are spinning in kipmid looking for something and not delaying
964 static inline void ipmi_si_set_not_busy(struct timespec64 *ts)
968 static inline int ipmi_si_is_busy(struct timespec64 *ts)
970 return ts->tv_nsec != -1;
973 static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result,
974 const struct smi_info *smi_info,
975 struct timespec64 *busy_until)
977 unsigned int max_busy_us = 0;
979 if (smi_info->intf_num < num_max_busy_us)
980 max_busy_us = kipmid_max_busy_us[smi_info->intf_num];
981 if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY)
982 ipmi_si_set_not_busy(busy_until);
983 else if (!ipmi_si_is_busy(busy_until)) {
984 getnstimeofday64(busy_until);
985 timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC);
987 struct timespec64 now;
989 getnstimeofday64(&now);
990 if (unlikely(timespec64_compare(&now, busy_until) > 0)) {
991 ipmi_si_set_not_busy(busy_until);
1000 * A busy-waiting loop for speeding up IPMI operation.
1002 * Lousy hardware makes this hard. This is only enabled for systems
1003 * that are not BT and do not have interrupts. It starts spinning
1004 * when an operation is complete or until max_busy tells it to stop
1005 * (if that is enabled). See the paragraph on kimid_max_busy_us in
1006 * Documentation/IPMI.txt for details.
1008 static int ipmi_thread(void *data)
1010 struct smi_info *smi_info = data;
1011 unsigned long flags;
1012 enum si_sm_result smi_result;
1013 struct timespec64 busy_until;
1015 ipmi_si_set_not_busy(&busy_until);
1016 set_user_nice(current, MAX_NICE);
1017 while (!kthread_should_stop()) {
1020 spin_lock_irqsave(&(smi_info->si_lock), flags);
1021 smi_result = smi_event_handler(smi_info, 0);
1024 * If the driver is doing something, there is a possible
1025 * race with the timer. If the timer handler see idle,
1026 * and the thread here sees something else, the timer
1027 * handler won't restart the timer even though it is
1028 * required. So start it here if necessary.
1030 if (smi_result != SI_SM_IDLE && !smi_info->timer_running)
1031 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
1033 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1034 busy_wait = ipmi_thread_busy_wait(smi_result, smi_info,
1036 if (smi_result == SI_SM_CALL_WITHOUT_DELAY)
1038 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
1040 else if (smi_result == SI_SM_IDLE) {
1041 if (atomic_read(&smi_info->need_watch)) {
1042 schedule_timeout_interruptible(100);
1044 /* Wait to be woken up when we are needed. */
1045 __set_current_state(TASK_INTERRUPTIBLE);
1049 schedule_timeout_interruptible(1);
1055 static void poll(void *send_info)
1057 struct smi_info *smi_info = send_info;
1058 unsigned long flags = 0;
1059 bool run_to_completion = smi_info->run_to_completion;
1062 * Make sure there is some delay in the poll loop so we can
1063 * drive time forward and timeout things.
1066 if (!run_to_completion)
1067 spin_lock_irqsave(&smi_info->si_lock, flags);
1068 smi_event_handler(smi_info, 10);
1069 if (!run_to_completion)
1070 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1073 static void request_events(void *send_info)
1075 struct smi_info *smi_info = send_info;
1077 if (!smi_info->has_event_buffer)
1080 atomic_set(&smi_info->req_events, 1);
1083 static void set_need_watch(void *send_info, bool enable)
1085 struct smi_info *smi_info = send_info;
1086 unsigned long flags;
1088 atomic_set(&smi_info->need_watch, enable);
1089 spin_lock_irqsave(&smi_info->si_lock, flags);
1090 check_start_timer_thread(smi_info);
1091 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1094 static void smi_timeout(struct timer_list *t)
1096 struct smi_info *smi_info = from_timer(smi_info, t, si_timer);
1097 enum si_sm_result smi_result;
1098 unsigned long flags;
1099 unsigned long jiffies_now;
1103 spin_lock_irqsave(&(smi_info->si_lock), flags);
1104 debug_timestamp("Timer");
1106 jiffies_now = jiffies;
1107 time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies)
1108 * SI_USEC_PER_JIFFY);
1109 smi_result = smi_event_handler(smi_info, time_diff);
1111 if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) {
1112 /* Running with interrupts, only do long timeouts. */
1113 timeout = jiffies + SI_TIMEOUT_JIFFIES;
1114 smi_inc_stat(smi_info, long_timeouts);
1119 * If the state machine asks for a short delay, then shorten
1120 * the timer timeout.
1122 if (smi_result == SI_SM_CALL_WITH_DELAY) {
1123 smi_inc_stat(smi_info, short_timeouts);
1124 timeout = jiffies + 1;
1126 smi_inc_stat(smi_info, long_timeouts);
1127 timeout = jiffies + SI_TIMEOUT_JIFFIES;
1131 if (smi_result != SI_SM_IDLE)
1132 smi_mod_timer(smi_info, timeout);
1134 smi_info->timer_running = false;
1135 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1138 irqreturn_t ipmi_si_irq_handler(int irq, void *data)
1140 struct smi_info *smi_info = data;
1141 unsigned long flags;
1143 if (smi_info->io.si_type == SI_BT)
1144 /* We need to clear the IRQ flag for the BT interface. */
1145 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
1146 IPMI_BT_INTMASK_CLEAR_IRQ_BIT
1147 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1149 spin_lock_irqsave(&(smi_info->si_lock), flags);
1151 smi_inc_stat(smi_info, interrupts);
1153 debug_timestamp("Interrupt");
1155 smi_event_handler(smi_info, 0);
1156 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1160 static int smi_start_processing(void *send_info,
1163 struct smi_info *new_smi = send_info;
1166 new_smi->intf = intf;
1168 /* Set up the timer that drives the interface. */
1169 timer_setup(&new_smi->si_timer, smi_timeout, 0);
1170 smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES);
1172 /* Try to claim any interrupts. */
1173 if (new_smi->io.irq_setup) {
1174 new_smi->io.irq_handler_data = new_smi;
1175 new_smi->io.irq_setup(&new_smi->io);
1179 * Check if the user forcefully enabled the daemon.
1181 if (new_smi->intf_num < num_force_kipmid)
1182 enable = force_kipmid[new_smi->intf_num];
1184 * The BT interface is efficient enough to not need a thread,
1185 * and there is no need for a thread if we have interrupts.
1187 else if ((new_smi->io.si_type != SI_BT) && (!new_smi->io.irq))
1191 new_smi->thread = kthread_run(ipmi_thread, new_smi,
1192 "kipmi%d", new_smi->intf_num);
1193 if (IS_ERR(new_smi->thread)) {
1194 dev_notice(new_smi->io.dev, "Could not start"
1195 " kernel thread due to error %ld, only using"
1196 " timers to drive the interface\n",
1197 PTR_ERR(new_smi->thread));
1198 new_smi->thread = NULL;
1205 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1207 struct smi_info *smi = send_info;
1209 data->addr_src = smi->io.addr_source;
1210 data->dev = smi->io.dev;
1211 data->addr_info = smi->io.addr_info;
1212 get_device(smi->io.dev);
1217 static void set_maintenance_mode(void *send_info, bool enable)
1219 struct smi_info *smi_info = send_info;
1222 atomic_set(&smi_info->req_events, 0);
1225 static const struct ipmi_smi_handlers handlers = {
1226 .owner = THIS_MODULE,
1227 .start_processing = smi_start_processing,
1228 .get_smi_info = get_smi_info,
1230 .request_events = request_events,
1231 .set_need_watch = set_need_watch,
1232 .set_maintenance_mode = set_maintenance_mode,
1233 .set_run_to_completion = set_run_to_completion,
1234 .flush_messages = flush_messages,
1238 static LIST_HEAD(smi_infos);
1239 static DEFINE_MUTEX(smi_infos_lock);
1240 static int smi_num; /* Used to sequence the SMIs */
1242 static const char * const addr_space_to_str[] = { "i/o", "mem" };
1244 module_param_array(force_kipmid, int, &num_force_kipmid, 0);
1245 MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or"
1246 " disabled(0). Normally the IPMI driver auto-detects"
1247 " this, but the value may be overridden by this parm.");
1248 module_param(unload_when_empty, bool, 0);
1249 MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are"
1250 " specified or found, default is 1. Setting to 0"
1251 " is useful for hot add of devices using hotmod.");
1252 module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644);
1253 MODULE_PARM_DESC(kipmid_max_busy_us,
1254 "Max time (in microseconds) to busy-wait for IPMI data before"
1255 " sleeping. 0 (default) means to wait forever. Set to 100-500"
1256 " if kipmid is using up a lot of CPU time.");
1258 void ipmi_irq_finish_setup(struct si_sm_io *io)
1260 if (io->si_type == SI_BT)
1261 /* Enable the interrupt in the BT interface. */
1262 io->outputb(io, IPMI_BT_INTMASK_REG,
1263 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1266 void ipmi_irq_start_cleanup(struct si_sm_io *io)
1268 if (io->si_type == SI_BT)
1269 /* Disable the interrupt in the BT interface. */
1270 io->outputb(io, IPMI_BT_INTMASK_REG, 0);
1273 static void std_irq_cleanup(struct si_sm_io *io)
1275 ipmi_irq_start_cleanup(io);
1276 free_irq(io->irq, io->irq_handler_data);
1279 int ipmi_std_irq_setup(struct si_sm_io *io)
1286 rv = request_irq(io->irq,
1287 ipmi_si_irq_handler,
1290 io->irq_handler_data);
1292 dev_warn(io->dev, "%s unable to claim interrupt %d,"
1293 " running polled\n",
1294 DEVICE_NAME, io->irq);
1297 io->irq_cleanup = std_irq_cleanup;
1298 ipmi_irq_finish_setup(io);
1299 dev_info(io->dev, "Using irq %d\n", io->irq);
1305 static int wait_for_msg_done(struct smi_info *smi_info)
1307 enum si_sm_result smi_result;
1309 smi_result = smi_info->handlers->event(smi_info->si_sm, 0);
1311 if (smi_result == SI_SM_CALL_WITH_DELAY ||
1312 smi_result == SI_SM_CALL_WITH_TICK_DELAY) {
1313 schedule_timeout_uninterruptible(1);
1314 smi_result = smi_info->handlers->event(
1315 smi_info->si_sm, jiffies_to_usecs(1));
1316 } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) {
1317 smi_result = smi_info->handlers->event(
1318 smi_info->si_sm, 0);
1322 if (smi_result == SI_SM_HOSED)
1324 * We couldn't get the state machine to run, so whatever's at
1325 * the port is probably not an IPMI SMI interface.
1332 static int try_get_dev_id(struct smi_info *smi_info)
1334 unsigned char msg[2];
1335 unsigned char *resp;
1336 unsigned long resp_len;
1339 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1344 * Do a Get Device ID command, since it comes back with some
1347 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1348 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1349 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
1351 rv = wait_for_msg_done(smi_info);
1355 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
1356 resp, IPMI_MAX_MSG_LENGTH);
1358 /* Check and record info from the get device id, in case we need it. */
1359 rv = ipmi_demangle_device_id(resp[0] >> 2, resp[1],
1360 resp + 2, resp_len - 2, &smi_info->device_id);
1367 static int get_global_enables(struct smi_info *smi_info, u8 *enables)
1369 unsigned char msg[3];
1370 unsigned char *resp;
1371 unsigned long resp_len;
1374 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1378 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1379 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
1380 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
1382 rv = wait_for_msg_done(smi_info);
1384 dev_warn(smi_info->io.dev,
1385 "Error getting response from get global enables command: %d\n",
1390 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
1391 resp, IPMI_MAX_MSG_LENGTH);
1394 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
1395 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
1397 dev_warn(smi_info->io.dev,
1398 "Invalid return from get global enables command: %ld %x %x %x\n",
1399 resp_len, resp[0], resp[1], resp[2]);
1412 * Returns 1 if it gets an error from the command.
1414 static int set_global_enables(struct smi_info *smi_info, u8 enables)
1416 unsigned char msg[3];
1417 unsigned char *resp;
1418 unsigned long resp_len;
1421 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1425 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1426 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1428 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
1430 rv = wait_for_msg_done(smi_info);
1432 dev_warn(smi_info->io.dev,
1433 "Error getting response from set global enables command: %d\n",
1438 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
1439 resp, IPMI_MAX_MSG_LENGTH);
1442 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
1443 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
1444 dev_warn(smi_info->io.dev,
1445 "Invalid return from set global enables command: %ld %x %x\n",
1446 resp_len, resp[0], resp[1]);
1460 * Some BMCs do not support clearing the receive irq bit in the global
1461 * enables (even if they don't support interrupts on the BMC). Check
1462 * for this and handle it properly.
1464 static void check_clr_rcv_irq(struct smi_info *smi_info)
1469 rv = get_global_enables(smi_info, &enables);
1471 if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0)
1472 /* Already clear, should work ok. */
1475 enables &= ~IPMI_BMC_RCV_MSG_INTR;
1476 rv = set_global_enables(smi_info, enables);
1480 dev_err(smi_info->io.dev,
1481 "Cannot check clearing the rcv irq: %d\n", rv);
1487 * An error when setting the event buffer bit means
1488 * clearing the bit is not supported.
1490 dev_warn(smi_info->io.dev,
1491 "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n");
1492 smi_info->cannot_disable_irq = true;
1497 * Some BMCs do not support setting the interrupt bits in the global
1498 * enables even if they support interrupts. Clearly bad, but we can
1501 static void check_set_rcv_irq(struct smi_info *smi_info)
1506 if (!smi_info->io.irq)
1509 rv = get_global_enables(smi_info, &enables);
1511 enables |= IPMI_BMC_RCV_MSG_INTR;
1512 rv = set_global_enables(smi_info, enables);
1516 dev_err(smi_info->io.dev,
1517 "Cannot check setting the rcv irq: %d\n", rv);
1523 * An error when setting the event buffer bit means
1524 * setting the bit is not supported.
1526 dev_warn(smi_info->io.dev,
1527 "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n");
1528 smi_info->cannot_disable_irq = true;
1529 smi_info->irq_enable_broken = true;
1533 static int try_enable_event_buffer(struct smi_info *smi_info)
1535 unsigned char msg[3];
1536 unsigned char *resp;
1537 unsigned long resp_len;
1540 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1544 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1545 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
1546 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
1548 rv = wait_for_msg_done(smi_info);
1550 pr_warn(PFX "Error getting response from get global enables command, the event buffer is not enabled.\n");
1554 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
1555 resp, IPMI_MAX_MSG_LENGTH);
1558 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
1559 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
1561 pr_warn(PFX "Invalid return from get global enables command, cannot enable the event buffer.\n");
1566 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
1567 /* buffer is already enabled, nothing to do. */
1568 smi_info->supports_event_msg_buff = true;
1572 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1573 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1574 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF;
1575 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
1577 rv = wait_for_msg_done(smi_info);
1579 pr_warn(PFX "Error getting response from set global, enables command, the event buffer is not enabled.\n");
1583 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
1584 resp, IPMI_MAX_MSG_LENGTH);
1587 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
1588 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
1589 pr_warn(PFX "Invalid return from get global, enables command, not enable the event buffer.\n");
1596 * An error when setting the event buffer bit means
1597 * that the event buffer is not supported.
1601 smi_info->supports_event_msg_buff = true;
1608 #ifdef CONFIG_IPMI_PROC_INTERFACE
1609 static int smi_type_proc_show(struct seq_file *m, void *v)
1611 struct smi_info *smi = m->private;
1613 seq_printf(m, "%s\n", si_to_str[smi->io.si_type]);
1618 static int smi_type_proc_open(struct inode *inode, struct file *file)
1620 return single_open(file, smi_type_proc_show, PDE_DATA(inode));
1623 static const struct file_operations smi_type_proc_ops = {
1624 .open = smi_type_proc_open,
1626 .llseek = seq_lseek,
1627 .release = single_release,
1630 static int smi_si_stats_proc_show(struct seq_file *m, void *v)
1632 struct smi_info *smi = m->private;
1634 seq_printf(m, "interrupts_enabled: %d\n",
1635 smi->io.irq && !smi->interrupt_disabled);
1636 seq_printf(m, "short_timeouts: %u\n",
1637 smi_get_stat(smi, short_timeouts));
1638 seq_printf(m, "long_timeouts: %u\n",
1639 smi_get_stat(smi, long_timeouts));
1640 seq_printf(m, "idles: %u\n",
1641 smi_get_stat(smi, idles));
1642 seq_printf(m, "interrupts: %u\n",
1643 smi_get_stat(smi, interrupts));
1644 seq_printf(m, "attentions: %u\n",
1645 smi_get_stat(smi, attentions));
1646 seq_printf(m, "flag_fetches: %u\n",
1647 smi_get_stat(smi, flag_fetches));
1648 seq_printf(m, "hosed_count: %u\n",
1649 smi_get_stat(smi, hosed_count));
1650 seq_printf(m, "complete_transactions: %u\n",
1651 smi_get_stat(smi, complete_transactions));
1652 seq_printf(m, "events: %u\n",
1653 smi_get_stat(smi, events));
1654 seq_printf(m, "watchdog_pretimeouts: %u\n",
1655 smi_get_stat(smi, watchdog_pretimeouts));
1656 seq_printf(m, "incoming_messages: %u\n",
1657 smi_get_stat(smi, incoming_messages));
1661 static int smi_si_stats_proc_open(struct inode *inode, struct file *file)
1663 return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode));
1666 static const struct file_operations smi_si_stats_proc_ops = {
1667 .open = smi_si_stats_proc_open,
1669 .llseek = seq_lseek,
1670 .release = single_release,
1673 static int smi_params_proc_show(struct seq_file *m, void *v)
1675 struct smi_info *smi = m->private;
1678 "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n",
1679 si_to_str[smi->io.si_type],
1680 addr_space_to_str[smi->io.addr_type],
1686 smi->io.slave_addr);
1691 static int smi_params_proc_open(struct inode *inode, struct file *file)
1693 return single_open(file, smi_params_proc_show, PDE_DATA(inode));
1696 static const struct file_operations smi_params_proc_ops = {
1697 .open = smi_params_proc_open,
1699 .llseek = seq_lseek,
1700 .release = single_release,
1704 #define IPMI_SI_ATTR(name) \
1705 static ssize_t ipmi_##name##_show(struct device *dev, \
1706 struct device_attribute *attr, \
1709 struct smi_info *smi_info = dev_get_drvdata(dev); \
1711 return snprintf(buf, 10, "%u\n", smi_get_stat(smi_info, name)); \
1713 static DEVICE_ATTR(name, S_IRUGO, ipmi_##name##_show, NULL)
1715 static ssize_t ipmi_type_show(struct device *dev,
1716 struct device_attribute *attr,
1719 struct smi_info *smi_info = dev_get_drvdata(dev);
1721 return snprintf(buf, 10, "%s\n", si_to_str[smi_info->io.si_type]);
1723 static DEVICE_ATTR(type, S_IRUGO, ipmi_type_show, NULL);
1725 static ssize_t ipmi_interrupts_enabled_show(struct device *dev,
1726 struct device_attribute *attr,
1729 struct smi_info *smi_info = dev_get_drvdata(dev);
1730 int enabled = smi_info->io.irq && !smi_info->interrupt_disabled;
1732 return snprintf(buf, 10, "%d\n", enabled);
1734 static DEVICE_ATTR(interrupts_enabled, S_IRUGO,
1735 ipmi_interrupts_enabled_show, NULL);
1737 IPMI_SI_ATTR(short_timeouts);
1738 IPMI_SI_ATTR(long_timeouts);
1739 IPMI_SI_ATTR(idles);
1740 IPMI_SI_ATTR(interrupts);
1741 IPMI_SI_ATTR(attentions);
1742 IPMI_SI_ATTR(flag_fetches);
1743 IPMI_SI_ATTR(hosed_count);
1744 IPMI_SI_ATTR(complete_transactions);
1745 IPMI_SI_ATTR(events);
1746 IPMI_SI_ATTR(watchdog_pretimeouts);
1747 IPMI_SI_ATTR(incoming_messages);
1749 static ssize_t ipmi_params_show(struct device *dev,
1750 struct device_attribute *attr,
1753 struct smi_info *smi_info = dev_get_drvdata(dev);
1755 return snprintf(buf, 200,
1756 "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n",
1757 si_to_str[smi_info->io.si_type],
1758 addr_space_to_str[smi_info->io.addr_type],
1759 smi_info->io.addr_data,
1760 smi_info->io.regspacing,
1761 smi_info->io.regsize,
1762 smi_info->io.regshift,
1764 smi_info->io.slave_addr);
1766 static DEVICE_ATTR(params, S_IRUGO, ipmi_params_show, NULL);
1768 static struct attribute *ipmi_si_dev_attrs[] = {
1769 &dev_attr_type.attr,
1770 &dev_attr_interrupts_enabled.attr,
1771 &dev_attr_short_timeouts.attr,
1772 &dev_attr_long_timeouts.attr,
1773 &dev_attr_idles.attr,
1774 &dev_attr_interrupts.attr,
1775 &dev_attr_attentions.attr,
1776 &dev_attr_flag_fetches.attr,
1777 &dev_attr_hosed_count.attr,
1778 &dev_attr_complete_transactions.attr,
1779 &dev_attr_events.attr,
1780 &dev_attr_watchdog_pretimeouts.attr,
1781 &dev_attr_incoming_messages.attr,
1782 &dev_attr_params.attr,
1786 static const struct attribute_group ipmi_si_dev_attr_group = {
1787 .attrs = ipmi_si_dev_attrs,
1791 * oem_data_avail_to_receive_msg_avail
1792 * @info - smi_info structure with msg_flags set
1794 * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL
1795 * Returns 1 indicating need to re-run handle_flags().
1797 static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info)
1799 smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) |
1805 * setup_dell_poweredge_oem_data_handler
1806 * @info - smi_info.device_id must be populated
1808 * Systems that match, but have firmware version < 1.40 may assert
1809 * OEM0_DATA_AVAIL on their own, without being told via Set Flags that
1810 * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL
1811 * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags
1812 * as RECEIVE_MSG_AVAIL instead.
1814 * As Dell has no plans to release IPMI 1.5 firmware that *ever*
1815 * assert the OEM[012] bits, and if it did, the driver would have to
1816 * change to handle that properly, we don't actually check for the
1818 * Device ID = 0x20 BMC on PowerEdge 8G servers
1819 * Device Revision = 0x80
1820 * Firmware Revision1 = 0x01 BMC version 1.40
1821 * Firmware Revision2 = 0x40 BCD encoded
1822 * IPMI Version = 0x51 IPMI 1.5
1823 * Manufacturer ID = A2 02 00 Dell IANA
1825 * Additionally, PowerEdge systems with IPMI < 1.5 may also assert
1826 * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL.
1829 #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20
1830 #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80
1831 #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51
1832 #define DELL_IANA_MFR_ID 0x0002a2
1833 static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info)
1835 struct ipmi_device_id *id = &smi_info->device_id;
1836 if (id->manufacturer_id == DELL_IANA_MFR_ID) {
1837 if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID &&
1838 id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV &&
1839 id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) {
1840 smi_info->oem_data_avail_handler =
1841 oem_data_avail_to_receive_msg_avail;
1842 } else if (ipmi_version_major(id) < 1 ||
1843 (ipmi_version_major(id) == 1 &&
1844 ipmi_version_minor(id) < 5)) {
1845 smi_info->oem_data_avail_handler =
1846 oem_data_avail_to_receive_msg_avail;
1851 #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA
1852 static void return_hosed_msg_badsize(struct smi_info *smi_info)
1854 struct ipmi_smi_msg *msg = smi_info->curr_msg;
1856 /* Make it a response */
1857 msg->rsp[0] = msg->data[0] | 4;
1858 msg->rsp[1] = msg->data[1];
1859 msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH;
1861 smi_info->curr_msg = NULL;
1862 deliver_recv_msg(smi_info, msg);
1866 * dell_poweredge_bt_xaction_handler
1867 * @info - smi_info.device_id must be populated
1869 * Dell PowerEdge servers with the BT interface (x6xx and 1750) will
1870 * not respond to a Get SDR command if the length of the data
1871 * requested is exactly 0x3A, which leads to command timeouts and no
1872 * data returned. This intercepts such commands, and causes userspace
1873 * callers to try again with a different-sized buffer, which succeeds.
1876 #define STORAGE_NETFN 0x0A
1877 #define STORAGE_CMD_GET_SDR 0x23
1878 static int dell_poweredge_bt_xaction_handler(struct notifier_block *self,
1879 unsigned long unused,
1882 struct smi_info *smi_info = in;
1883 unsigned char *data = smi_info->curr_msg->data;
1884 unsigned int size = smi_info->curr_msg->data_size;
1886 (data[0]>>2) == STORAGE_NETFN &&
1887 data[1] == STORAGE_CMD_GET_SDR &&
1889 return_hosed_msg_badsize(smi_info);
1895 static struct notifier_block dell_poweredge_bt_xaction_notifier = {
1896 .notifier_call = dell_poweredge_bt_xaction_handler,
1900 * setup_dell_poweredge_bt_xaction_handler
1901 * @info - smi_info.device_id must be filled in already
1903 * Fills in smi_info.device_id.start_transaction_pre_hook
1904 * when we know what function to use there.
1907 setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info)
1909 struct ipmi_device_id *id = &smi_info->device_id;
1910 if (id->manufacturer_id == DELL_IANA_MFR_ID &&
1911 smi_info->io.si_type == SI_BT)
1912 register_xaction_notifier(&dell_poweredge_bt_xaction_notifier);
1916 * setup_oem_data_handler
1917 * @info - smi_info.device_id must be filled in already
1919 * Fills in smi_info.device_id.oem_data_available_handler
1920 * when we know what function to use there.
1923 static void setup_oem_data_handler(struct smi_info *smi_info)
1925 setup_dell_poweredge_oem_data_handler(smi_info);
1928 static void setup_xaction_handlers(struct smi_info *smi_info)
1930 setup_dell_poweredge_bt_xaction_handler(smi_info);
1933 static void check_for_broken_irqs(struct smi_info *smi_info)
1935 check_clr_rcv_irq(smi_info);
1936 check_set_rcv_irq(smi_info);
1939 static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
1941 if (smi_info->thread != NULL)
1942 kthread_stop(smi_info->thread);
1943 if (smi_info->timer_running)
1944 del_timer_sync(&smi_info->si_timer);
1947 static struct smi_info *find_dup_si(struct smi_info *info)
1951 list_for_each_entry(e, &smi_infos, link) {
1952 if (e->io.addr_type != info->io.addr_type)
1954 if (e->io.addr_data == info->io.addr_data) {
1956 * This is a cheap hack, ACPI doesn't have a defined
1957 * slave address but SMBIOS does. Pick it up from
1958 * any source that has it available.
1960 if (info->io.slave_addr && !e->io.slave_addr)
1961 e->io.slave_addr = info->io.slave_addr;
1969 int ipmi_si_add_smi(struct si_sm_io *io)
1972 struct smi_info *new_smi, *dup;
1974 if (!io->io_setup) {
1975 if (io->addr_type == IPMI_IO_ADDR_SPACE) {
1976 io->io_setup = ipmi_si_port_setup;
1977 } else if (io->addr_type == IPMI_MEM_ADDR_SPACE) {
1978 io->io_setup = ipmi_si_mem_setup;
1984 new_smi = kzalloc(sizeof(*new_smi), GFP_KERNEL);
1987 spin_lock_init(&new_smi->si_lock);
1991 mutex_lock(&smi_infos_lock);
1992 dup = find_dup_si(new_smi);
1994 if (new_smi->io.addr_source == SI_ACPI &&
1995 dup->io.addr_source == SI_SMBIOS) {
1996 /* We prefer ACPI over SMBIOS. */
1997 dev_info(dup->io.dev,
1998 "Removing SMBIOS-specified %s state machine in favor of ACPI\n",
1999 si_to_str[new_smi->io.si_type]);
2000 cleanup_one_si(dup);
2002 dev_info(new_smi->io.dev,
2003 "%s-specified %s state machine: duplicate\n",
2004 ipmi_addr_src_to_str(new_smi->io.addr_source),
2005 si_to_str[new_smi->io.si_type]);
2012 pr_info(PFX "Adding %s-specified %s state machine\n",
2013 ipmi_addr_src_to_str(new_smi->io.addr_source),
2014 si_to_str[new_smi->io.si_type]);
2016 /* So we know not to free it unless we have allocated one. */
2017 new_smi->intf = NULL;
2018 new_smi->si_sm = NULL;
2019 new_smi->handlers = NULL;
2021 list_add_tail(&new_smi->link, &smi_infos);
2024 rv = try_smi_init(new_smi);
2026 mutex_unlock(&smi_infos_lock);
2027 cleanup_one_si(new_smi);
2032 mutex_unlock(&smi_infos_lock);
2037 * Try to start up an interface. Must be called with smi_infos_lock
2038 * held, primarily to keep smi_num consistent, we only one to do these
2041 static int try_smi_init(struct smi_info *new_smi)
2045 char *init_name = NULL;
2047 pr_info(PFX "Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n",
2048 ipmi_addr_src_to_str(new_smi->io.addr_source),
2049 si_to_str[new_smi->io.si_type],
2050 addr_space_to_str[new_smi->io.addr_type],
2051 new_smi->io.addr_data,
2052 new_smi->io.slave_addr, new_smi->io.irq);
2054 switch (new_smi->io.si_type) {
2056 new_smi->handlers = &kcs_smi_handlers;
2060 new_smi->handlers = &smic_smi_handlers;
2064 new_smi->handlers = &bt_smi_handlers;
2068 /* No support for anything else yet. */
2073 new_smi->intf_num = smi_num;
2075 /* Do this early so it's available for logs. */
2076 if (!new_smi->io.dev) {
2077 init_name = kasprintf(GFP_KERNEL, "ipmi_si.%d",
2081 * If we don't already have a device from something
2082 * else (like PCI), then register a new one.
2084 new_smi->pdev = platform_device_alloc("ipmi_si",
2086 if (!new_smi->pdev) {
2087 pr_err(PFX "Unable to allocate platform device\n");
2090 new_smi->io.dev = &new_smi->pdev->dev;
2091 new_smi->io.dev->driver = &ipmi_platform_driver.driver;
2092 /* Nulled by device_add() */
2093 new_smi->io.dev->init_name = init_name;
2096 /* Allocate the state machine's data and initialize it. */
2097 new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL);
2098 if (!new_smi->si_sm) {
2102 new_smi->io.io_size = new_smi->handlers->init_data(new_smi->si_sm,
2105 /* Now that we know the I/O size, we can set up the I/O. */
2106 rv = new_smi->io.io_setup(&new_smi->io);
2108 dev_err(new_smi->io.dev, "Could not set up I/O space\n");
2112 /* Do low-level detection first. */
2113 if (new_smi->handlers->detect(new_smi->si_sm)) {
2114 if (new_smi->io.addr_source)
2115 dev_err(new_smi->io.dev,
2116 "Interface detection failed\n");
2122 * Attempt a get device id command. If it fails, we probably
2123 * don't have a BMC here.
2125 rv = try_get_dev_id(new_smi);
2127 if (new_smi->io.addr_source)
2128 dev_err(new_smi->io.dev,
2129 "There appears to be no BMC at this location\n");
2133 setup_oem_data_handler(new_smi);
2134 setup_xaction_handlers(new_smi);
2135 check_for_broken_irqs(new_smi);
2137 new_smi->waiting_msg = NULL;
2138 new_smi->curr_msg = NULL;
2139 atomic_set(&new_smi->req_events, 0);
2140 new_smi->run_to_completion = false;
2141 for (i = 0; i < SI_NUM_STATS; i++)
2142 atomic_set(&new_smi->stats[i], 0);
2144 new_smi->interrupt_disabled = true;
2145 atomic_set(&new_smi->need_watch, 0);
2147 rv = try_enable_event_buffer(new_smi);
2149 new_smi->has_event_buffer = true;
2152 * Start clearing the flags before we enable interrupts or the
2153 * timer to avoid racing with the timer.
2155 start_clear_flags(new_smi, false);
2158 * IRQ is defined to be set when non-zero. req_events will
2159 * cause a global flags check that will enable interrupts.
2161 if (new_smi->io.irq) {
2162 new_smi->interrupt_disabled = false;
2163 atomic_set(&new_smi->req_events, 1);
2166 if (new_smi->pdev) {
2167 rv = platform_device_add(new_smi->pdev);
2169 dev_err(new_smi->io.dev,
2170 "Unable to register system interface device: %d\n",
2176 dev_set_drvdata(new_smi->io.dev, new_smi);
2177 rv = device_add_group(new_smi->io.dev, &ipmi_si_dev_attr_group);
2179 dev_err(new_smi->io.dev,
2180 "Unable to add device attributes: error %d\n",
2182 goto out_err_stop_timer;
2185 rv = ipmi_register_smi(&handlers,
2188 new_smi->io.slave_addr);
2190 dev_err(new_smi->io.dev,
2191 "Unable to register device: error %d\n",
2193 goto out_err_remove_attrs;
2196 #ifdef CONFIG_IPMI_PROC_INTERFACE
2197 rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
2201 dev_err(new_smi->io.dev,
2202 "Unable to create proc entry: %d\n", rv);
2203 goto out_err_stop_timer;
2206 rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
2207 &smi_si_stats_proc_ops,
2210 dev_err(new_smi->io.dev,
2211 "Unable to create proc entry: %d\n", rv);
2212 goto out_err_stop_timer;
2215 rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
2216 &smi_params_proc_ops,
2219 dev_err(new_smi->io.dev,
2220 "Unable to create proc entry: %d\n", rv);
2221 goto out_err_stop_timer;
2225 /* Don't increment till we know we have succeeded. */
2228 dev_info(new_smi->io.dev, "IPMI %s interface initialized\n",
2229 si_to_str[new_smi->io.si_type]);
2231 WARN_ON(new_smi->io.dev->init_name != NULL);
2236 out_err_remove_attrs:
2237 device_remove_group(new_smi->io.dev, &ipmi_si_dev_attr_group);
2238 dev_set_drvdata(new_smi->io.dev, NULL);
2241 wait_for_timer_and_thread(new_smi);
2244 new_smi->interrupt_disabled = true;
2246 if (new_smi->intf) {
2247 ipmi_smi_t intf = new_smi->intf;
2248 new_smi->intf = NULL;
2249 ipmi_unregister_smi(intf);
2252 if (new_smi->io.irq_cleanup) {
2253 new_smi->io.irq_cleanup(&new_smi->io);
2254 new_smi->io.irq_cleanup = NULL;
2258 * Wait until we know that we are out of any interrupt
2259 * handlers might have been running before we freed the
2262 synchronize_sched();
2264 if (new_smi->si_sm) {
2265 if (new_smi->handlers)
2266 new_smi->handlers->cleanup(new_smi->si_sm);
2267 kfree(new_smi->si_sm);
2268 new_smi->si_sm = NULL;
2270 if (new_smi->io.addr_source_cleanup) {
2271 new_smi->io.addr_source_cleanup(&new_smi->io);
2272 new_smi->io.addr_source_cleanup = NULL;
2274 if (new_smi->io.io_cleanup) {
2275 new_smi->io.io_cleanup(&new_smi->io);
2276 new_smi->io.io_cleanup = NULL;
2279 if (new_smi->pdev) {
2280 platform_device_unregister(new_smi->pdev);
2281 new_smi->pdev = NULL;
2282 } else if (new_smi->pdev) {
2283 platform_device_put(new_smi->pdev);
2291 static int init_ipmi_si(void)
2294 enum ipmi_addr_src type = SI_INVALID;
2299 pr_info("IPMI System Interface driver.\n");
2301 /* If the user gave us a device, they presumably want us to use it */
2302 if (!ipmi_si_hardcode_find_bmc())
2305 ipmi_si_platform_init();
2309 ipmi_si_parisc_init();
2311 /* We prefer devices with interrupts, but in the case of a machine
2312 with multiple BMCs we assume that there will be several instances
2313 of a given type so if we succeed in registering a type then also
2314 try to register everything else of the same type */
2316 mutex_lock(&smi_infos_lock);
2317 list_for_each_entry(e, &smi_infos, link) {
2318 /* Try to register a device if it has an IRQ and we either
2319 haven't successfully registered a device yet or this
2320 device has the same type as one we successfully registered */
2321 if (e->io.irq && (!type || e->io.addr_source == type)) {
2322 if (!try_smi_init(e)) {
2323 type = e->io.addr_source;
2328 /* type will only have been set if we successfully registered an si */
2330 goto skip_fallback_noirq;
2332 /* Fall back to the preferred device */
2334 list_for_each_entry(e, &smi_infos, link) {
2335 if (!e->io.irq && (!type || e->io.addr_source == type)) {
2336 if (!try_smi_init(e)) {
2337 type = e->io.addr_source;
2342 skip_fallback_noirq:
2344 mutex_unlock(&smi_infos_lock);
2349 mutex_lock(&smi_infos_lock);
2350 if (unload_when_empty && list_empty(&smi_infos)) {
2351 mutex_unlock(&smi_infos_lock);
2353 pr_warn(PFX "Unable to find any System Interface(s)\n");
2356 mutex_unlock(&smi_infos_lock);
2360 module_init(init_ipmi_si);
2362 static void cleanup_one_si(struct smi_info *to_clean)
2369 if (to_clean->intf) {
2370 ipmi_smi_t intf = to_clean->intf;
2372 to_clean->intf = NULL;
2373 rv = ipmi_unregister_smi(intf);
2375 pr_err(PFX "Unable to unregister device: errno=%d\n",
2380 device_remove_group(to_clean->io.dev, &ipmi_si_dev_attr_group);
2381 dev_set_drvdata(to_clean->io.dev, NULL);
2383 list_del(&to_clean->link);
2386 * Make sure that interrupts, the timer and the thread are
2387 * stopped and will not run again.
2389 if (to_clean->io.irq_cleanup)
2390 to_clean->io.irq_cleanup(&to_clean->io);
2391 wait_for_timer_and_thread(to_clean);
2394 * Timeouts are stopped, now make sure the interrupts are off
2395 * in the BMC. Note that timers and CPU interrupts are off,
2396 * so no need for locks.
2398 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
2400 schedule_timeout_uninterruptible(1);
2402 if (to_clean->handlers)
2403 disable_si_irq(to_clean, false);
2404 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
2406 schedule_timeout_uninterruptible(1);
2409 if (to_clean->handlers)
2410 to_clean->handlers->cleanup(to_clean->si_sm);
2412 kfree(to_clean->si_sm);
2414 if (to_clean->io.addr_source_cleanup)
2415 to_clean->io.addr_source_cleanup(&to_clean->io);
2416 if (to_clean->io.io_cleanup)
2417 to_clean->io.io_cleanup(&to_clean->io);
2420 platform_device_unregister(to_clean->pdev);
2425 int ipmi_si_remove_by_dev(struct device *dev)
2430 mutex_lock(&smi_infos_lock);
2431 list_for_each_entry(e, &smi_infos, link) {
2432 if (e->io.dev == dev) {
2438 mutex_unlock(&smi_infos_lock);
2443 void ipmi_si_remove_by_data(int addr_space, enum si_type si_type,
2447 struct smi_info *e, *tmp_e;
2449 mutex_lock(&smi_infos_lock);
2450 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) {
2451 if (e->io.addr_type != addr_space)
2453 if (e->io.si_type != si_type)
2455 if (e->io.addr_data == addr)
2458 mutex_unlock(&smi_infos_lock);
2461 static void cleanup_ipmi_si(void)
2463 struct smi_info *e, *tmp_e;
2468 ipmi_si_pci_shutdown();
2470 ipmi_si_parisc_shutdown();
2472 ipmi_si_platform_shutdown();
2474 mutex_lock(&smi_infos_lock);
2475 list_for_each_entry_safe(e, tmp_e, &smi_infos, link)
2477 mutex_unlock(&smi_infos_lock);
2479 module_exit(cleanup_ipmi_si);
2481 MODULE_ALIAS("platform:dmi-ipmi-si");
2482 MODULE_LICENSE("GPL");
2483 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
2484 MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT"
2485 " system interfaces.");