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/pci.h>
53 #include <linux/ioport.h>
54 #include <linux/notifier.h>
55 #include <linux/mutex.h>
56 #include <linux/kthread.h>
58 #include <linux/interrupt.h>
59 #include <linux/rcupdate.h>
60 #include <linux/ipmi.h>
61 #include <linux/ipmi_smi.h>
63 #include "ipmi_si_sm.h"
64 #include <linux/dmi.h>
65 #include <linux/string.h>
66 #include <linux/ctype.h>
67 #include <linux/pnp.h>
68 #include <linux/of_device.h>
69 #include <linux/of_platform.h>
70 #include <linux/of_address.h>
71 #include <linux/of_irq.h>
74 #include <asm/hardware.h> /* for register_parisc_driver() stuff */
75 #include <asm/parisc-device.h>
78 #define PFX "ipmi_si: "
80 /* Measure times between events in the driver. */
83 /* Call every 10 ms. */
84 #define SI_TIMEOUT_TIME_USEC 10000
85 #define SI_USEC_PER_JIFFY (1000000/HZ)
86 #define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY)
87 #define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a
98 /* FIXME - add watchdog stuff. */
101 /* Some BT-specific defines we need here. */
102 #define IPMI_BT_INTMASK_REG 2
103 #define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2
104 #define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1
107 SI_KCS, SI_SMIC, SI_BT
109 static char *si_to_str[] = { "kcs", "smic", "bt" };
111 #define DEVICE_NAME "ipmi_si"
113 static struct platform_driver ipmi_driver;
116 * Indexes into stats[] in smi_info below.
118 enum si_stat_indexes {
120 * Number of times the driver requested a timer while an operation
123 SI_STAT_short_timeouts = 0,
126 * Number of times the driver requested a timer while nothing was in
129 SI_STAT_long_timeouts,
131 /* Number of times the interface was idle while being polled. */
134 /* Number of interrupts the driver handled. */
137 /* Number of time the driver got an ATTN from the hardware. */
140 /* Number of times the driver requested flags from the hardware. */
141 SI_STAT_flag_fetches,
143 /* Number of times the hardware didn't follow the state machine. */
146 /* Number of completed messages. */
147 SI_STAT_complete_transactions,
149 /* Number of IPMI events received from the hardware. */
152 /* Number of watchdog pretimeouts. */
153 SI_STAT_watchdog_pretimeouts,
155 /* Number of asynchronous messages received. */
156 SI_STAT_incoming_messages,
159 /* This *must* remain last, add new values above this. */
166 struct si_sm_data *si_sm;
167 struct si_sm_handlers *handlers;
168 enum si_type si_type;
170 struct ipmi_smi_msg *waiting_msg;
171 struct ipmi_smi_msg *curr_msg;
172 enum si_intf_state si_state;
175 * Used to handle the various types of I/O that can occur with
179 int (*io_setup)(struct smi_info *info);
180 void (*io_cleanup)(struct smi_info *info);
181 int (*irq_setup)(struct smi_info *info);
182 void (*irq_cleanup)(struct smi_info *info);
183 unsigned int io_size;
184 enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
185 void (*addr_source_cleanup)(struct smi_info *info);
186 void *addr_source_data;
189 * Per-OEM handler, called from handle_flags(). Returns 1
190 * when handle_flags() needs to be re-run or 0 indicating it
191 * set si_state itself.
193 int (*oem_data_avail_handler)(struct smi_info *smi_info);
196 * Flags from the last GET_MSG_FLAGS command, used when an ATTN
197 * is set to hold the flags until we are done handling everything
200 #define RECEIVE_MSG_AVAIL 0x01
201 #define EVENT_MSG_BUFFER_FULL 0x02
202 #define WDT_PRE_TIMEOUT_INT 0x08
203 #define OEM0_DATA_AVAIL 0x20
204 #define OEM1_DATA_AVAIL 0x40
205 #define OEM2_DATA_AVAIL 0x80
206 #define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \
209 unsigned char msg_flags;
211 /* Does the BMC have an event buffer? */
212 bool has_event_buffer;
215 * If set to true, this will request events the next time the
216 * state machine is idle.
221 * If true, run the state machine to completion on every send
222 * call. Generally used after a panic to make sure stuff goes
225 bool run_to_completion;
227 /* The I/O port of an SI interface. */
231 * The space between start addresses of the two ports. For
232 * instance, if the first port is 0xca2 and the spacing is 4, then
233 * the second port is 0xca6.
235 unsigned int spacing;
237 /* zero if no irq; */
240 /* The timer for this si. */
241 struct timer_list si_timer;
243 /* This flag is set, if the timer is running (timer_pending() isn't enough) */
246 /* The time (in jiffies) the last timeout occurred at. */
247 unsigned long last_timeout_jiffies;
249 /* Are we waiting for the events, pretimeouts, received msgs? */
253 * The driver will disable interrupts when it gets into a
254 * situation where it cannot handle messages due to lack of
255 * memory. Once that situation clears up, it will re-enable
258 bool interrupt_disabled;
261 * Does the BMC support events?
263 bool supports_event_msg_buff;
266 * Can we clear the global enables receive irq bit?
268 bool cannot_clear_recv_irq_bit;
271 * Did we get an attention that we did not handle?
275 /* From the get device id response... */
276 struct ipmi_device_id device_id;
278 /* Driver model stuff. */
280 struct platform_device *pdev;
283 * True if we allocated the device, false if it came from
284 * someplace else (like PCI).
288 /* Slave address, could be reported from DMI. */
289 unsigned char slave_addr;
291 /* Counters and things for the proc filesystem. */
292 atomic_t stats[SI_NUM_STATS];
294 struct task_struct *thread;
296 struct list_head link;
297 union ipmi_smi_info_union addr_info;
300 #define smi_inc_stat(smi, stat) \
301 atomic_inc(&(smi)->stats[SI_STAT_ ## stat])
302 #define smi_get_stat(smi, stat) \
303 ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat]))
305 #define SI_MAX_PARMS 4
307 static int force_kipmid[SI_MAX_PARMS];
308 static int num_force_kipmid;
310 static bool pci_registered;
313 static bool pnp_registered;
316 static bool parisc_registered;
319 static unsigned int kipmid_max_busy_us[SI_MAX_PARMS];
320 static int num_max_busy_us;
322 static bool unload_when_empty = true;
324 static int add_smi(struct smi_info *smi);
325 static int try_smi_init(struct smi_info *smi);
326 static void cleanup_one_si(struct smi_info *to_clean);
327 static void cleanup_ipmi_si(void);
330 void debug_timestamp(char *msg)
334 getnstimeofday64(&t);
335 pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) t.tv_sec, t.tv_nsec);
338 #define debug_timestamp(x)
341 static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list);
342 static int register_xaction_notifier(struct notifier_block *nb)
344 return atomic_notifier_chain_register(&xaction_notifier_list, nb);
347 static void deliver_recv_msg(struct smi_info *smi_info,
348 struct ipmi_smi_msg *msg)
350 /* Deliver the message to the upper layer. */
352 ipmi_smi_msg_received(smi_info->intf, msg);
354 ipmi_free_smi_msg(msg);
357 static void return_hosed_msg(struct smi_info *smi_info, int cCode)
359 struct ipmi_smi_msg *msg = smi_info->curr_msg;
361 if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED)
362 cCode = IPMI_ERR_UNSPECIFIED;
363 /* else use it as is */
365 /* Make it a response */
366 msg->rsp[0] = msg->data[0] | 4;
367 msg->rsp[1] = msg->data[1];
371 smi_info->curr_msg = NULL;
372 deliver_recv_msg(smi_info, msg);
375 static enum si_sm_result start_next_msg(struct smi_info *smi_info)
379 if (!smi_info->waiting_msg) {
380 smi_info->curr_msg = NULL;
385 smi_info->curr_msg = smi_info->waiting_msg;
386 smi_info->waiting_msg = NULL;
387 debug_timestamp("Start2");
388 err = atomic_notifier_call_chain(&xaction_notifier_list,
390 if (err & NOTIFY_STOP_MASK) {
391 rv = SI_SM_CALL_WITHOUT_DELAY;
394 err = smi_info->handlers->start_transaction(
396 smi_info->curr_msg->data,
397 smi_info->curr_msg->data_size);
399 return_hosed_msg(smi_info, err);
401 rv = SI_SM_CALL_WITHOUT_DELAY;
407 static void start_check_enables(struct smi_info *smi_info)
409 unsigned char msg[2];
411 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
412 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
414 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
415 smi_info->si_state = SI_CHECKING_ENABLES;
418 static void start_clear_flags(struct smi_info *smi_info)
420 unsigned char msg[3];
422 /* Make sure the watchdog pre-timeout flag is not set at startup. */
423 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
424 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
425 msg[2] = WDT_PRE_TIMEOUT_INT;
427 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
428 smi_info->si_state = SI_CLEARING_FLAGS;
431 static void start_getting_msg_queue(struct smi_info *smi_info)
433 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
434 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD;
435 smi_info->curr_msg->data_size = 2;
437 smi_info->handlers->start_transaction(
439 smi_info->curr_msg->data,
440 smi_info->curr_msg->data_size);
441 smi_info->si_state = SI_GETTING_MESSAGES;
444 static void start_getting_events(struct smi_info *smi_info)
446 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
447 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
448 smi_info->curr_msg->data_size = 2;
450 smi_info->handlers->start_transaction(
452 smi_info->curr_msg->data,
453 smi_info->curr_msg->data_size);
454 smi_info->si_state = SI_GETTING_EVENTS;
457 static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val)
459 smi_info->last_timeout_jiffies = jiffies;
460 mod_timer(&smi_info->si_timer, new_val);
461 smi_info->timer_running = true;
465 * When we have a situtaion where we run out of memory and cannot
466 * allocate messages, we just leave them in the BMC and run the system
467 * polled until we can allocate some memory. Once we have some
468 * memory, we will re-enable the interrupt.
470 * Note that we cannot just use disable_irq(), since the interrupt may
473 static inline bool disable_si_irq(struct smi_info *smi_info)
475 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
476 smi_info->interrupt_disabled = true;
477 start_check_enables(smi_info);
483 static inline bool enable_si_irq(struct smi_info *smi_info)
485 if ((smi_info->irq) && (smi_info->interrupt_disabled)) {
486 smi_info->interrupt_disabled = false;
487 start_check_enables(smi_info);
494 * Allocate a message. If unable to allocate, start the interrupt
495 * disable process and return NULL. If able to allocate but
496 * interrupts are disabled, free the message and return NULL after
497 * starting the interrupt enable process.
499 static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info)
501 struct ipmi_smi_msg *msg;
503 msg = ipmi_alloc_smi_msg();
505 if (!disable_si_irq(smi_info))
506 smi_info->si_state = SI_NORMAL;
507 } else if (enable_si_irq(smi_info)) {
508 ipmi_free_smi_msg(msg);
514 static void handle_flags(struct smi_info *smi_info)
517 if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
518 /* Watchdog pre-timeout */
519 smi_inc_stat(smi_info, watchdog_pretimeouts);
521 start_clear_flags(smi_info);
522 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
524 ipmi_smi_watchdog_pretimeout(smi_info->intf);
525 } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) {
526 /* Messages available. */
527 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
528 if (!smi_info->curr_msg)
531 start_getting_msg_queue(smi_info);
532 } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) {
533 /* Events available. */
534 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
535 if (!smi_info->curr_msg)
538 start_getting_events(smi_info);
539 } else if (smi_info->msg_flags & OEM_DATA_AVAIL &&
540 smi_info->oem_data_avail_handler) {
541 if (smi_info->oem_data_avail_handler(smi_info))
544 smi_info->si_state = SI_NORMAL;
548 * Global enables we care about.
550 #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
551 IPMI_BMC_EVT_MSG_INTR)
553 static u8 current_global_enables(struct smi_info *smi_info, u8 base,
558 if (smi_info->supports_event_msg_buff)
559 enables |= IPMI_BMC_EVT_MSG_BUFF;
561 if ((smi_info->irq && !smi_info->interrupt_disabled) ||
562 smi_info->cannot_clear_recv_irq_bit)
563 enables |= IPMI_BMC_RCV_MSG_INTR;
565 if (smi_info->supports_event_msg_buff &&
566 smi_info->irq && !smi_info->interrupt_disabled)
568 enables |= IPMI_BMC_EVT_MSG_INTR;
570 *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR);
575 static void check_bt_irq(struct smi_info *smi_info, bool irq_on)
577 u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG);
579 irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT;
581 if ((bool)irqstate == irq_on)
585 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
586 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
588 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0);
591 static void handle_transaction_done(struct smi_info *smi_info)
593 struct ipmi_smi_msg *msg;
595 debug_timestamp("Done");
596 switch (smi_info->si_state) {
598 if (!smi_info->curr_msg)
601 smi_info->curr_msg->rsp_size
602 = smi_info->handlers->get_result(
604 smi_info->curr_msg->rsp,
605 IPMI_MAX_MSG_LENGTH);
608 * Do this here becase deliver_recv_msg() releases the
609 * lock, and a new message can be put in during the
610 * time the lock is released.
612 msg = smi_info->curr_msg;
613 smi_info->curr_msg = NULL;
614 deliver_recv_msg(smi_info, msg);
617 case SI_GETTING_FLAGS:
619 unsigned char msg[4];
622 /* We got the flags from the SMI, now handle them. */
623 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
625 /* Error fetching flags, just give up for now. */
626 smi_info->si_state = SI_NORMAL;
627 } else if (len < 4) {
629 * Hmm, no flags. That's technically illegal, but
630 * don't use uninitialized data.
632 smi_info->si_state = SI_NORMAL;
634 smi_info->msg_flags = msg[3];
635 handle_flags(smi_info);
640 case SI_CLEARING_FLAGS:
642 unsigned char msg[3];
644 /* We cleared the flags. */
645 smi_info->handlers->get_result(smi_info->si_sm, msg, 3);
647 /* Error clearing flags */
648 dev_warn(smi_info->dev,
649 "Error clearing flags: %2.2x\n", msg[2]);
651 smi_info->si_state = SI_NORMAL;
655 case SI_GETTING_EVENTS:
657 smi_info->curr_msg->rsp_size
658 = smi_info->handlers->get_result(
660 smi_info->curr_msg->rsp,
661 IPMI_MAX_MSG_LENGTH);
664 * Do this here becase deliver_recv_msg() releases the
665 * lock, and a new message can be put in during the
666 * time the lock is released.
668 msg = smi_info->curr_msg;
669 smi_info->curr_msg = NULL;
670 if (msg->rsp[2] != 0) {
671 /* Error getting event, probably done. */
674 /* Take off the event flag. */
675 smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
676 handle_flags(smi_info);
678 smi_inc_stat(smi_info, events);
681 * Do this before we deliver the message
682 * because delivering the message releases the
683 * lock and something else can mess with the
686 handle_flags(smi_info);
688 deliver_recv_msg(smi_info, msg);
693 case SI_GETTING_MESSAGES:
695 smi_info->curr_msg->rsp_size
696 = smi_info->handlers->get_result(
698 smi_info->curr_msg->rsp,
699 IPMI_MAX_MSG_LENGTH);
702 * Do this here becase deliver_recv_msg() releases the
703 * lock, and a new message can be put in during the
704 * time the lock is released.
706 msg = smi_info->curr_msg;
707 smi_info->curr_msg = NULL;
708 if (msg->rsp[2] != 0) {
709 /* Error getting event, probably done. */
712 /* Take off the msg flag. */
713 smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
714 handle_flags(smi_info);
716 smi_inc_stat(smi_info, incoming_messages);
719 * Do this before we deliver the message
720 * because delivering the message releases the
721 * lock and something else can mess with the
724 handle_flags(smi_info);
726 deliver_recv_msg(smi_info, msg);
731 case SI_CHECKING_ENABLES:
733 unsigned char msg[4];
737 /* We got the flags from the SMI, now handle them. */
738 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
740 dev_warn(smi_info->dev,
741 "Couldn't get irq info: %x.\n", msg[2]);
742 dev_warn(smi_info->dev,
743 "Maybe ok, but ipmi might run very slowly.\n");
744 smi_info->si_state = SI_NORMAL;
747 enables = current_global_enables(smi_info, 0, &irq_on);
748 if (smi_info->si_type == SI_BT)
749 /* BT has its own interrupt enable bit. */
750 check_bt_irq(smi_info, irq_on);
751 if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) {
752 /* Enables are not correct, fix them. */
753 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
754 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
755 msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK);
756 smi_info->handlers->start_transaction(
757 smi_info->si_sm, msg, 3);
758 smi_info->si_state = SI_SETTING_ENABLES;
759 } else if (smi_info->supports_event_msg_buff) {
760 smi_info->curr_msg = ipmi_alloc_smi_msg();
761 if (!smi_info->curr_msg) {
762 smi_info->si_state = SI_NORMAL;
765 start_getting_msg_queue(smi_info);
767 smi_info->si_state = SI_NORMAL;
772 case SI_SETTING_ENABLES:
774 unsigned char msg[4];
776 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
778 dev_warn(smi_info->dev,
779 "Could not set the global enables: 0x%x.\n",
782 if (smi_info->supports_event_msg_buff) {
783 smi_info->curr_msg = ipmi_alloc_smi_msg();
784 if (!smi_info->curr_msg) {
785 smi_info->si_state = SI_NORMAL;
788 start_getting_msg_queue(smi_info);
790 smi_info->si_state = SI_NORMAL;
798 * Called on timeouts and events. Timeouts should pass the elapsed
799 * time, interrupts should pass in zero. Must be called with
800 * si_lock held and interrupts disabled.
802 static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
805 enum si_sm_result si_sm_result;
809 * There used to be a loop here that waited a little while
810 * (around 25us) before giving up. That turned out to be
811 * pointless, the minimum delays I was seeing were in the 300us
812 * range, which is far too long to wait in an interrupt. So
813 * we just run until the state machine tells us something
814 * happened or it needs a delay.
816 si_sm_result = smi_info->handlers->event(smi_info->si_sm, time);
818 while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY)
819 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
821 if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) {
822 smi_inc_stat(smi_info, complete_transactions);
824 handle_transaction_done(smi_info);
825 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
826 } else if (si_sm_result == SI_SM_HOSED) {
827 smi_inc_stat(smi_info, hosed_count);
830 * Do the before return_hosed_msg, because that
833 smi_info->si_state = SI_NORMAL;
834 if (smi_info->curr_msg != NULL) {
836 * If we were handling a user message, format
837 * a response to send to the upper layer to
838 * tell it about the error.
840 return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED);
842 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
846 * We prefer handling attn over new messages. But don't do
847 * this if there is not yet an upper layer to handle anything.
849 if (likely(smi_info->intf) &&
850 (si_sm_result == SI_SM_ATTN || smi_info->got_attn)) {
851 unsigned char msg[2];
853 if (smi_info->si_state != SI_NORMAL) {
855 * We got an ATTN, but we are doing something else.
856 * Handle the ATTN later.
858 smi_info->got_attn = true;
860 smi_info->got_attn = false;
861 smi_inc_stat(smi_info, attentions);
864 * Got a attn, send down a get message flags to see
865 * what's causing it. It would be better to handle
866 * this in the upper layer, but due to the way
867 * interrupts work with the SMI, that's not really
870 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
871 msg[1] = IPMI_GET_MSG_FLAGS_CMD;
873 smi_info->handlers->start_transaction(
874 smi_info->si_sm, msg, 2);
875 smi_info->si_state = SI_GETTING_FLAGS;
880 /* If we are currently idle, try to start the next message. */
881 if (si_sm_result == SI_SM_IDLE) {
882 smi_inc_stat(smi_info, idles);
884 si_sm_result = start_next_msg(smi_info);
885 if (si_sm_result != SI_SM_IDLE)
889 if ((si_sm_result == SI_SM_IDLE)
890 && (atomic_read(&smi_info->req_events))) {
892 * We are idle and the upper layer requested that I fetch
895 atomic_set(&smi_info->req_events, 0);
898 * Take this opportunity to check the interrupt and
899 * message enable state for the BMC. The BMC can be
900 * asynchronously reset, and may thus get interrupts
901 * disable and messages disabled.
903 if (smi_info->supports_event_msg_buff || smi_info->irq) {
904 start_check_enables(smi_info);
906 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
907 if (!smi_info->curr_msg)
910 start_getting_events(smi_info);
918 static void check_start_timer_thread(struct smi_info *smi_info)
920 if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
921 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
923 if (smi_info->thread)
924 wake_up_process(smi_info->thread);
926 start_next_msg(smi_info);
927 smi_event_handler(smi_info, 0);
931 static void sender(void *send_info,
932 struct ipmi_smi_msg *msg)
934 struct smi_info *smi_info = send_info;
935 enum si_sm_result result;
938 debug_timestamp("Enqueue");
940 if (smi_info->run_to_completion) {
942 * If we are running to completion, start it and run
943 * transactions until everything is clear.
945 smi_info->waiting_msg = msg;
948 * Run to completion means we are single-threaded, no
952 result = smi_event_handler(smi_info, 0);
953 while (result != SI_SM_IDLE) {
954 udelay(SI_SHORT_TIMEOUT_USEC);
955 result = smi_event_handler(smi_info,
956 SI_SHORT_TIMEOUT_USEC);
961 spin_lock_irqsave(&smi_info->si_lock, flags);
963 * The following two lines don't need to be under the lock for
964 * the lock's sake, but they do need SMP memory barriers to
965 * avoid getting things out of order. We are already claiming
966 * the lock, anyway, so just do it under the lock to avoid the
969 BUG_ON(smi_info->waiting_msg);
970 smi_info->waiting_msg = msg;
971 check_start_timer_thread(smi_info);
972 spin_unlock_irqrestore(&smi_info->si_lock, flags);
975 static void set_run_to_completion(void *send_info, bool i_run_to_completion)
977 struct smi_info *smi_info = send_info;
978 enum si_sm_result result;
980 smi_info->run_to_completion = i_run_to_completion;
981 if (i_run_to_completion) {
982 result = smi_event_handler(smi_info, 0);
983 while (result != SI_SM_IDLE) {
984 udelay(SI_SHORT_TIMEOUT_USEC);
985 result = smi_event_handler(smi_info,
986 SI_SHORT_TIMEOUT_USEC);
992 * Use -1 in the nsec value of the busy waiting timespec to tell that
993 * we are spinning in kipmid looking for something and not delaying
996 static inline void ipmi_si_set_not_busy(struct timespec64 *ts)
1000 static inline int ipmi_si_is_busy(struct timespec64 *ts)
1002 return ts->tv_nsec != -1;
1005 static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result,
1006 const struct smi_info *smi_info,
1007 struct timespec64 *busy_until)
1009 unsigned int max_busy_us = 0;
1011 if (smi_info->intf_num < num_max_busy_us)
1012 max_busy_us = kipmid_max_busy_us[smi_info->intf_num];
1013 if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY)
1014 ipmi_si_set_not_busy(busy_until);
1015 else if (!ipmi_si_is_busy(busy_until)) {
1016 getnstimeofday64(busy_until);
1017 timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC);
1019 struct timespec64 now;
1021 getnstimeofday64(&now);
1022 if (unlikely(timespec64_compare(&now, busy_until) > 0)) {
1023 ipmi_si_set_not_busy(busy_until);
1032 * A busy-waiting loop for speeding up IPMI operation.
1034 * Lousy hardware makes this hard. This is only enabled for systems
1035 * that are not BT and do not have interrupts. It starts spinning
1036 * when an operation is complete or until max_busy tells it to stop
1037 * (if that is enabled). See the paragraph on kimid_max_busy_us in
1038 * Documentation/IPMI.txt for details.
1040 static int ipmi_thread(void *data)
1042 struct smi_info *smi_info = data;
1043 unsigned long flags;
1044 enum si_sm_result smi_result;
1045 struct timespec64 busy_until;
1047 ipmi_si_set_not_busy(&busy_until);
1048 set_user_nice(current, MAX_NICE);
1049 while (!kthread_should_stop()) {
1052 spin_lock_irqsave(&(smi_info->si_lock), flags);
1053 smi_result = smi_event_handler(smi_info, 0);
1056 * If the driver is doing something, there is a possible
1057 * race with the timer. If the timer handler see idle,
1058 * and the thread here sees something else, the timer
1059 * handler won't restart the timer even though it is
1060 * required. So start it here if necessary.
1062 if (smi_result != SI_SM_IDLE && !smi_info->timer_running)
1063 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
1065 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1066 busy_wait = ipmi_thread_busy_wait(smi_result, smi_info,
1068 if (smi_result == SI_SM_CALL_WITHOUT_DELAY)
1070 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
1072 else if (smi_result == SI_SM_IDLE) {
1073 if (atomic_read(&smi_info->need_watch)) {
1074 schedule_timeout_interruptible(100);
1076 /* Wait to be woken up when we are needed. */
1077 __set_current_state(TASK_INTERRUPTIBLE);
1081 schedule_timeout_interruptible(1);
1087 static void poll(void *send_info)
1089 struct smi_info *smi_info = send_info;
1090 unsigned long flags = 0;
1091 bool run_to_completion = smi_info->run_to_completion;
1094 * Make sure there is some delay in the poll loop so we can
1095 * drive time forward and timeout things.
1098 if (!run_to_completion)
1099 spin_lock_irqsave(&smi_info->si_lock, flags);
1100 smi_event_handler(smi_info, 10);
1101 if (!run_to_completion)
1102 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1105 static void request_events(void *send_info)
1107 struct smi_info *smi_info = send_info;
1109 if (!smi_info->has_event_buffer)
1112 atomic_set(&smi_info->req_events, 1);
1115 static void set_need_watch(void *send_info, bool enable)
1117 struct smi_info *smi_info = send_info;
1118 unsigned long flags;
1120 atomic_set(&smi_info->need_watch, enable);
1121 spin_lock_irqsave(&smi_info->si_lock, flags);
1122 check_start_timer_thread(smi_info);
1123 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1126 static int initialized;
1128 static void smi_timeout(unsigned long data)
1130 struct smi_info *smi_info = (struct smi_info *) data;
1131 enum si_sm_result smi_result;
1132 unsigned long flags;
1133 unsigned long jiffies_now;
1137 spin_lock_irqsave(&(smi_info->si_lock), flags);
1138 debug_timestamp("Timer");
1140 jiffies_now = jiffies;
1141 time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies)
1142 * SI_USEC_PER_JIFFY);
1143 smi_result = smi_event_handler(smi_info, time_diff);
1145 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
1146 /* Running with interrupts, only do long timeouts. */
1147 timeout = jiffies + SI_TIMEOUT_JIFFIES;
1148 smi_inc_stat(smi_info, long_timeouts);
1153 * If the state machine asks for a short delay, then shorten
1154 * the timer timeout.
1156 if (smi_result == SI_SM_CALL_WITH_DELAY) {
1157 smi_inc_stat(smi_info, short_timeouts);
1158 timeout = jiffies + 1;
1160 smi_inc_stat(smi_info, long_timeouts);
1161 timeout = jiffies + SI_TIMEOUT_JIFFIES;
1165 if (smi_result != SI_SM_IDLE)
1166 smi_mod_timer(smi_info, timeout);
1168 smi_info->timer_running = false;
1169 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1172 static irqreturn_t si_irq_handler(int irq, void *data)
1174 struct smi_info *smi_info = data;
1175 unsigned long flags;
1177 spin_lock_irqsave(&(smi_info->si_lock), flags);
1179 smi_inc_stat(smi_info, interrupts);
1181 debug_timestamp("Interrupt");
1183 smi_event_handler(smi_info, 0);
1184 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1188 static irqreturn_t si_bt_irq_handler(int irq, void *data)
1190 struct smi_info *smi_info = data;
1191 /* We need to clear the IRQ flag for the BT interface. */
1192 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
1193 IPMI_BT_INTMASK_CLEAR_IRQ_BIT
1194 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1195 return si_irq_handler(irq, data);
1198 static int smi_start_processing(void *send_info,
1201 struct smi_info *new_smi = send_info;
1204 new_smi->intf = intf;
1206 /* Try to claim any interrupts. */
1207 if (new_smi->irq_setup)
1208 new_smi->irq_setup(new_smi);
1210 /* Set up the timer that drives the interface. */
1211 setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi);
1212 smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES);
1215 * Check if the user forcefully enabled the daemon.
1217 if (new_smi->intf_num < num_force_kipmid)
1218 enable = force_kipmid[new_smi->intf_num];
1220 * The BT interface is efficient enough to not need a thread,
1221 * and there is no need for a thread if we have interrupts.
1223 else if ((new_smi->si_type != SI_BT) && (!new_smi->irq))
1227 new_smi->thread = kthread_run(ipmi_thread, new_smi,
1228 "kipmi%d", new_smi->intf_num);
1229 if (IS_ERR(new_smi->thread)) {
1230 dev_notice(new_smi->dev, "Could not start"
1231 " kernel thread due to error %ld, only using"
1232 " timers to drive the interface\n",
1233 PTR_ERR(new_smi->thread));
1234 new_smi->thread = NULL;
1241 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1243 struct smi_info *smi = send_info;
1245 data->addr_src = smi->addr_source;
1246 data->dev = smi->dev;
1247 data->addr_info = smi->addr_info;
1248 get_device(smi->dev);
1253 static void set_maintenance_mode(void *send_info, bool enable)
1255 struct smi_info *smi_info = send_info;
1258 atomic_set(&smi_info->req_events, 0);
1261 static struct ipmi_smi_handlers handlers = {
1262 .owner = THIS_MODULE,
1263 .start_processing = smi_start_processing,
1264 .get_smi_info = get_smi_info,
1266 .request_events = request_events,
1267 .set_need_watch = set_need_watch,
1268 .set_maintenance_mode = set_maintenance_mode,
1269 .set_run_to_completion = set_run_to_completion,
1274 * There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
1275 * a default IO port, and 1 ACPI/SPMI address. That sets SI_MAX_DRIVERS.
1278 static LIST_HEAD(smi_infos);
1279 static DEFINE_MUTEX(smi_infos_lock);
1280 static int smi_num; /* Used to sequence the SMIs */
1282 #define DEFAULT_REGSPACING 1
1283 #define DEFAULT_REGSIZE 1
1286 static bool si_tryacpi = 1;
1289 static bool si_trydmi = 1;
1291 static bool si_tryplatform = 1;
1293 static bool si_trypci = 1;
1295 static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
1296 static char *si_type[SI_MAX_PARMS];
1297 #define MAX_SI_TYPE_STR 30
1298 static char si_type_str[MAX_SI_TYPE_STR];
1299 static unsigned long addrs[SI_MAX_PARMS];
1300 static unsigned int num_addrs;
1301 static unsigned int ports[SI_MAX_PARMS];
1302 static unsigned int num_ports;
1303 static int irqs[SI_MAX_PARMS];
1304 static unsigned int num_irqs;
1305 static int regspacings[SI_MAX_PARMS];
1306 static unsigned int num_regspacings;
1307 static int regsizes[SI_MAX_PARMS];
1308 static unsigned int num_regsizes;
1309 static int regshifts[SI_MAX_PARMS];
1310 static unsigned int num_regshifts;
1311 static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */
1312 static unsigned int num_slave_addrs;
1314 #define IPMI_IO_ADDR_SPACE 0
1315 #define IPMI_MEM_ADDR_SPACE 1
1316 static char *addr_space_to_str[] = { "i/o", "mem" };
1318 static int hotmod_handler(const char *val, struct kernel_param *kp);
1320 module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
1321 MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
1322 " Documentation/IPMI.txt in the kernel sources for the"
1326 module_param_named(tryacpi, si_tryacpi, bool, 0);
1327 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1328 " default scan of the interfaces identified via ACPI");
1331 module_param_named(trydmi, si_trydmi, bool, 0);
1332 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
1333 " default scan of the interfaces identified via DMI");
1335 module_param_named(tryplatform, si_tryplatform, bool, 0);
1336 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1337 " default scan of the interfaces identified via platform"
1338 " interfaces like openfirmware");
1340 module_param_named(trypci, si_trypci, bool, 0);
1341 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1342 " default scan of the interfaces identified via pci");
1344 module_param_named(trydefaults, si_trydefaults, bool, 0);
1345 MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the"
1346 " default scan of the KCS and SMIC interface at the standard"
1348 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
1349 MODULE_PARM_DESC(type, "Defines the type of each interface, each"
1350 " interface separated by commas. The types are 'kcs',"
1351 " 'smic', and 'bt'. For example si_type=kcs,bt will set"
1352 " the first interface to kcs and the second to bt");
1353 module_param_array(addrs, ulong, &num_addrs, 0);
1354 MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
1355 " addresses separated by commas. Only use if an interface"
1356 " is in memory. Otherwise, set it to zero or leave"
1358 module_param_array(ports, uint, &num_ports, 0);
1359 MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
1360 " addresses separated by commas. Only use if an interface"
1361 " is a port. Otherwise, set it to zero or leave"
1363 module_param_array(irqs, int, &num_irqs, 0);
1364 MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
1365 " addresses separated by commas. Only use if an interface"
1366 " has an interrupt. Otherwise, set it to zero or leave"
1368 module_param_array(regspacings, int, &num_regspacings, 0);
1369 MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
1370 " and each successive register used by the interface. For"
1371 " instance, if the start address is 0xca2 and the spacing"
1372 " is 2, then the second address is at 0xca4. Defaults"
1374 module_param_array(regsizes, int, &num_regsizes, 0);
1375 MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
1376 " This should generally be 1, 2, 4, or 8 for an 8-bit,"
1377 " 16-bit, 32-bit, or 64-bit register. Use this if you"
1378 " the 8-bit IPMI register has to be read from a larger"
1380 module_param_array(regshifts, int, &num_regshifts, 0);
1381 MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
1382 " IPMI register, in bits. For instance, if the data"
1383 " is read from a 32-bit word and the IPMI data is in"
1384 " bit 8-15, then the shift would be 8");
1385 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1386 MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
1387 " the controller. Normally this is 0x20, but can be"
1388 " overridden by this parm. This is an array indexed"
1389 " by interface number.");
1390 module_param_array(force_kipmid, int, &num_force_kipmid, 0);
1391 MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or"
1392 " disabled(0). Normally the IPMI driver auto-detects"
1393 " this, but the value may be overridden by this parm.");
1394 module_param(unload_when_empty, bool, 0);
1395 MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are"
1396 " specified or found, default is 1. Setting to 0"
1397 " is useful for hot add of devices using hotmod.");
1398 module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644);
1399 MODULE_PARM_DESC(kipmid_max_busy_us,
1400 "Max time (in microseconds) to busy-wait for IPMI data before"
1401 " sleeping. 0 (default) means to wait forever. Set to 100-500"
1402 " if kipmid is using up a lot of CPU time.");
1405 static void std_irq_cleanup(struct smi_info *info)
1407 if (info->si_type == SI_BT)
1408 /* Disable the interrupt in the BT interface. */
1409 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0);
1410 free_irq(info->irq, info);
1413 static int std_irq_setup(struct smi_info *info)
1420 if (info->si_type == SI_BT) {
1421 rv = request_irq(info->irq,
1427 /* Enable the interrupt in the BT interface. */
1428 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG,
1429 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1431 rv = request_irq(info->irq,
1437 dev_warn(info->dev, "%s unable to claim interrupt %d,"
1438 " running polled\n",
1439 DEVICE_NAME, info->irq);
1442 info->irq_cleanup = std_irq_cleanup;
1443 dev_info(info->dev, "Using irq %d\n", info->irq);
1449 static unsigned char port_inb(struct si_sm_io *io, unsigned int offset)
1451 unsigned int addr = io->addr_data;
1453 return inb(addr + (offset * io->regspacing));
1456 static void port_outb(struct si_sm_io *io, unsigned int offset,
1459 unsigned int addr = io->addr_data;
1461 outb(b, addr + (offset * io->regspacing));
1464 static unsigned char port_inw(struct si_sm_io *io, unsigned int offset)
1466 unsigned int addr = io->addr_data;
1468 return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1471 static void port_outw(struct si_sm_io *io, unsigned int offset,
1474 unsigned int addr = io->addr_data;
1476 outw(b << io->regshift, addr + (offset * io->regspacing));
1479 static unsigned char port_inl(struct si_sm_io *io, unsigned int offset)
1481 unsigned int addr = io->addr_data;
1483 return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1486 static void port_outl(struct si_sm_io *io, unsigned int offset,
1489 unsigned int addr = io->addr_data;
1491 outl(b << io->regshift, addr+(offset * io->regspacing));
1494 static void port_cleanup(struct smi_info *info)
1496 unsigned int addr = info->io.addr_data;
1500 for (idx = 0; idx < info->io_size; idx++)
1501 release_region(addr + idx * info->io.regspacing,
1506 static int port_setup(struct smi_info *info)
1508 unsigned int addr = info->io.addr_data;
1514 info->io_cleanup = port_cleanup;
1517 * Figure out the actual inb/inw/inl/etc routine to use based
1518 * upon the register size.
1520 switch (info->io.regsize) {
1522 info->io.inputb = port_inb;
1523 info->io.outputb = port_outb;
1526 info->io.inputb = port_inw;
1527 info->io.outputb = port_outw;
1530 info->io.inputb = port_inl;
1531 info->io.outputb = port_outl;
1534 dev_warn(info->dev, "Invalid register size: %d\n",
1540 * Some BIOSes reserve disjoint I/O regions in their ACPI
1541 * tables. This causes problems when trying to register the
1542 * entire I/O region. Therefore we must register each I/O
1545 for (idx = 0; idx < info->io_size; idx++) {
1546 if (request_region(addr + idx * info->io.regspacing,
1547 info->io.regsize, DEVICE_NAME) == NULL) {
1548 /* Undo allocations */
1550 release_region(addr + idx * info->io.regspacing,
1559 static unsigned char intf_mem_inb(struct si_sm_io *io, unsigned int offset)
1561 return readb((io->addr)+(offset * io->regspacing));
1564 static void intf_mem_outb(struct si_sm_io *io, unsigned int offset,
1567 writeb(b, (io->addr)+(offset * io->regspacing));
1570 static unsigned char intf_mem_inw(struct si_sm_io *io, unsigned int offset)
1572 return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)
1576 static void intf_mem_outw(struct si_sm_io *io, unsigned int offset,
1579 writeb(b << io->regshift, (io->addr)+(offset * io->regspacing));
1582 static unsigned char intf_mem_inl(struct si_sm_io *io, unsigned int offset)
1584 return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)
1588 static void intf_mem_outl(struct si_sm_io *io, unsigned int offset,
1591 writel(b << io->regshift, (io->addr)+(offset * io->regspacing));
1595 static unsigned char mem_inq(struct si_sm_io *io, unsigned int offset)
1597 return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)
1601 static void mem_outq(struct si_sm_io *io, unsigned int offset,
1604 writeq(b << io->regshift, (io->addr)+(offset * io->regspacing));
1608 static void mem_cleanup(struct smi_info *info)
1610 unsigned long addr = info->io.addr_data;
1613 if (info->io.addr) {
1614 iounmap(info->io.addr);
1616 mapsize = ((info->io_size * info->io.regspacing)
1617 - (info->io.regspacing - info->io.regsize));
1619 release_mem_region(addr, mapsize);
1623 static int mem_setup(struct smi_info *info)
1625 unsigned long addr = info->io.addr_data;
1631 info->io_cleanup = mem_cleanup;
1634 * Figure out the actual readb/readw/readl/etc routine to use based
1635 * upon the register size.
1637 switch (info->io.regsize) {
1639 info->io.inputb = intf_mem_inb;
1640 info->io.outputb = intf_mem_outb;
1643 info->io.inputb = intf_mem_inw;
1644 info->io.outputb = intf_mem_outw;
1647 info->io.inputb = intf_mem_inl;
1648 info->io.outputb = intf_mem_outl;
1652 info->io.inputb = mem_inq;
1653 info->io.outputb = mem_outq;
1657 dev_warn(info->dev, "Invalid register size: %d\n",
1663 * Calculate the total amount of memory to claim. This is an
1664 * unusual looking calculation, but it avoids claiming any
1665 * more memory than it has to. It will claim everything
1666 * between the first address to the end of the last full
1669 mapsize = ((info->io_size * info->io.regspacing)
1670 - (info->io.regspacing - info->io.regsize));
1672 if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL)
1675 info->io.addr = ioremap(addr, mapsize);
1676 if (info->io.addr == NULL) {
1677 release_mem_region(addr, mapsize);
1684 * Parms come in as <op1>[:op2[:op3...]]. ops are:
1685 * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
1693 enum hotmod_op { HM_ADD, HM_REMOVE };
1694 struct hotmod_vals {
1698 static struct hotmod_vals hotmod_ops[] = {
1700 { "remove", HM_REMOVE },
1703 static struct hotmod_vals hotmod_si[] = {
1705 { "smic", SI_SMIC },
1709 static struct hotmod_vals hotmod_as[] = {
1710 { "mem", IPMI_MEM_ADDR_SPACE },
1711 { "i/o", IPMI_IO_ADDR_SPACE },
1715 static int parse_str(struct hotmod_vals *v, int *val, char *name, char **curr)
1720 s = strchr(*curr, ',');
1722 printk(KERN_WARNING PFX "No hotmod %s given.\n", name);
1727 for (i = 0; v[i].name; i++) {
1728 if (strcmp(*curr, v[i].name) == 0) {
1735 printk(KERN_WARNING PFX "Invalid hotmod %s '%s'\n", name, *curr);
1739 static int check_hotmod_int_op(const char *curr, const char *option,
1740 const char *name, int *val)
1744 if (strcmp(curr, name) == 0) {
1746 printk(KERN_WARNING PFX
1747 "No option given for '%s'\n",
1751 *val = simple_strtoul(option, &n, 0);
1752 if ((*n != '\0') || (*option == '\0')) {
1753 printk(KERN_WARNING PFX
1754 "Bad option given for '%s'\n",
1763 static struct smi_info *smi_info_alloc(void)
1765 struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
1768 spin_lock_init(&info->si_lock);
1772 static int hotmod_handler(const char *val, struct kernel_param *kp)
1774 char *str = kstrdup(val, GFP_KERNEL);
1776 char *next, *curr, *s, *n, *o;
1778 enum si_type si_type;
1788 struct smi_info *info;
1793 /* Kill any trailing spaces, as we can get a "\n" from echo. */
1796 while ((ival >= 0) && isspace(str[ival])) {
1801 for (curr = str; curr; curr = next) {
1806 ipmb = 0; /* Choose the default if not specified */
1808 next = strchr(curr, ':');
1814 rv = parse_str(hotmod_ops, &ival, "operation", &curr);
1819 rv = parse_str(hotmod_si, &ival, "interface type", &curr);
1824 rv = parse_str(hotmod_as, &addr_space, "address space", &curr);
1828 s = strchr(curr, ',');
1833 addr = simple_strtoul(curr, &n, 0);
1834 if ((*n != '\0') || (*curr == '\0')) {
1835 printk(KERN_WARNING PFX "Invalid hotmod address"
1842 s = strchr(curr, ',');
1847 o = strchr(curr, '=');
1852 rv = check_hotmod_int_op(curr, o, "rsp", ®spacing);
1857 rv = check_hotmod_int_op(curr, o, "rsi", ®size);
1862 rv = check_hotmod_int_op(curr, o, "rsh", ®shift);
1867 rv = check_hotmod_int_op(curr, o, "irq", &irq);
1872 rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb);
1879 printk(KERN_WARNING PFX
1880 "Invalid hotmod option '%s'\n",
1886 info = smi_info_alloc();
1892 info->addr_source = SI_HOTMOD;
1893 info->si_type = si_type;
1894 info->io.addr_data = addr;
1895 info->io.addr_type = addr_space;
1896 if (addr_space == IPMI_MEM_ADDR_SPACE)
1897 info->io_setup = mem_setup;
1899 info->io_setup = port_setup;
1901 info->io.addr = NULL;
1902 info->io.regspacing = regspacing;
1903 if (!info->io.regspacing)
1904 info->io.regspacing = DEFAULT_REGSPACING;
1905 info->io.regsize = regsize;
1906 if (!info->io.regsize)
1907 info->io.regsize = DEFAULT_REGSPACING;
1908 info->io.regshift = regshift;
1911 info->irq_setup = std_irq_setup;
1912 info->slave_addr = ipmb;
1919 rv = try_smi_init(info);
1921 cleanup_one_si(info);
1926 struct smi_info *e, *tmp_e;
1928 mutex_lock(&smi_infos_lock);
1929 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) {
1930 if (e->io.addr_type != addr_space)
1932 if (e->si_type != si_type)
1934 if (e->io.addr_data == addr)
1937 mutex_unlock(&smi_infos_lock);
1946 static int hardcode_find_bmc(void)
1950 struct smi_info *info;
1952 for (i = 0; i < SI_MAX_PARMS; i++) {
1953 if (!ports[i] && !addrs[i])
1956 info = smi_info_alloc();
1960 info->addr_source = SI_HARDCODED;
1961 printk(KERN_INFO PFX "probing via hardcoded address\n");
1963 if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) {
1964 info->si_type = SI_KCS;
1965 } else if (strcmp(si_type[i], "smic") == 0) {
1966 info->si_type = SI_SMIC;
1967 } else if (strcmp(si_type[i], "bt") == 0) {
1968 info->si_type = SI_BT;
1970 printk(KERN_WARNING PFX "Interface type specified "
1971 "for interface %d, was invalid: %s\n",
1979 info->io_setup = port_setup;
1980 info->io.addr_data = ports[i];
1981 info->io.addr_type = IPMI_IO_ADDR_SPACE;
1982 } else if (addrs[i]) {
1984 info->io_setup = mem_setup;
1985 info->io.addr_data = addrs[i];
1986 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
1988 printk(KERN_WARNING PFX "Interface type specified "
1989 "for interface %d, but port and address were "
1990 "not set or set to zero.\n", i);
1995 info->io.addr = NULL;
1996 info->io.regspacing = regspacings[i];
1997 if (!info->io.regspacing)
1998 info->io.regspacing = DEFAULT_REGSPACING;
1999 info->io.regsize = regsizes[i];
2000 if (!info->io.regsize)
2001 info->io.regsize = DEFAULT_REGSPACING;
2002 info->io.regshift = regshifts[i];
2003 info->irq = irqs[i];
2005 info->irq_setup = std_irq_setup;
2006 info->slave_addr = slave_addrs[i];
2008 if (!add_smi(info)) {
2009 if (try_smi_init(info))
2010 cleanup_one_si(info);
2021 #include <linux/acpi.h>
2024 * Once we get an ACPI failure, we don't try any more, because we go
2025 * through the tables sequentially. Once we don't find a table, there
2028 static int acpi_failure;
2030 /* For GPE-type interrupts. */
2031 static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
2032 u32 gpe_number, void *context)
2034 struct smi_info *smi_info = context;
2035 unsigned long flags;
2037 spin_lock_irqsave(&(smi_info->si_lock), flags);
2039 smi_inc_stat(smi_info, interrupts);
2041 debug_timestamp("ACPI_GPE");
2043 smi_event_handler(smi_info, 0);
2044 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
2046 return ACPI_INTERRUPT_HANDLED;
2049 static void acpi_gpe_irq_cleanup(struct smi_info *info)
2054 acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe);
2057 static int acpi_gpe_irq_setup(struct smi_info *info)
2064 status = acpi_install_gpe_handler(NULL,
2066 ACPI_GPE_LEVEL_TRIGGERED,
2069 if (status != AE_OK) {
2070 dev_warn(info->dev, "%s unable to claim ACPI GPE %d,"
2071 " running polled\n", DEVICE_NAME, info->irq);
2075 info->irq_cleanup = acpi_gpe_irq_cleanup;
2076 dev_info(info->dev, "Using ACPI GPE %d\n", info->irq);
2083 * http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf
2094 s8 CreatorRevision[4];
2097 s16 SpecificationRevision;
2100 * Bit 0 - SCI interrupt supported
2101 * Bit 1 - I/O APIC/SAPIC
2106 * If bit 0 of InterruptType is set, then this is the SCI
2107 * interrupt in the GPEx_STS register.
2114 * If bit 1 of InterruptType is set, then this is the I/O
2115 * APIC/SAPIC interrupt.
2117 u32 GlobalSystemInterrupt;
2119 /* The actual register address. */
2120 struct acpi_generic_address addr;
2124 s8 spmi_id[1]; /* A '\0' terminated array starts here. */
2127 static int try_init_spmi(struct SPMITable *spmi)
2129 struct smi_info *info;
2132 if (spmi->IPMIlegacy != 1) {
2133 printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy);
2137 info = smi_info_alloc();
2139 printk(KERN_ERR PFX "Could not allocate SI data (3)\n");
2143 info->addr_source = SI_SPMI;
2144 printk(KERN_INFO PFX "probing via SPMI\n");
2146 /* Figure out the interface type. */
2147 switch (spmi->InterfaceType) {
2149 info->si_type = SI_KCS;
2152 info->si_type = SI_SMIC;
2155 info->si_type = SI_BT;
2157 case 4: /* SSIF, just ignore */
2161 printk(KERN_INFO PFX "Unknown ACPI/SPMI SI type %d\n",
2162 spmi->InterfaceType);
2167 if (spmi->InterruptType & 1) {
2168 /* We've got a GPE interrupt. */
2169 info->irq = spmi->GPE;
2170 info->irq_setup = acpi_gpe_irq_setup;
2171 } else if (spmi->InterruptType & 2) {
2172 /* We've got an APIC/SAPIC interrupt. */
2173 info->irq = spmi->GlobalSystemInterrupt;
2174 info->irq_setup = std_irq_setup;
2176 /* Use the default interrupt setting. */
2178 info->irq_setup = NULL;
2181 if (spmi->addr.bit_width) {
2182 /* A (hopefully) properly formed register bit width. */
2183 info->io.regspacing = spmi->addr.bit_width / 8;
2185 info->io.regspacing = DEFAULT_REGSPACING;
2187 info->io.regsize = info->io.regspacing;
2188 info->io.regshift = spmi->addr.bit_offset;
2190 if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
2191 info->io_setup = mem_setup;
2192 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2193 } else if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
2194 info->io_setup = port_setup;
2195 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2198 printk(KERN_WARNING PFX "Unknown ACPI I/O Address type\n");
2201 info->io.addr_data = spmi->addr.address;
2203 pr_info("ipmi_si: SPMI: %s %#lx regsize %d spacing %d irq %d\n",
2204 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2205 info->io.addr_data, info->io.regsize, info->io.regspacing,
2215 static void spmi_find_bmc(void)
2218 struct SPMITable *spmi;
2227 for (i = 0; ; i++) {
2228 status = acpi_get_table(ACPI_SIG_SPMI, i+1,
2229 (struct acpi_table_header **)&spmi);
2230 if (status != AE_OK)
2233 try_init_spmi(spmi);
2237 static int ipmi_pnp_probe(struct pnp_dev *dev,
2238 const struct pnp_device_id *dev_id)
2240 struct acpi_device *acpi_dev;
2241 struct smi_info *info;
2242 struct resource *res, *res_second;
2245 unsigned long long tmp;
2248 acpi_dev = pnp_acpi_device(dev);
2252 info = smi_info_alloc();
2256 info->addr_source = SI_ACPI;
2257 printk(KERN_INFO PFX "probing via ACPI\n");
2259 handle = acpi_dev->handle;
2260 info->addr_info.acpi_info.acpi_handle = handle;
2262 /* _IFT tells us the interface type: KCS, BT, etc */
2263 status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
2264 if (ACPI_FAILURE(status)) {
2265 dev_err(&dev->dev, "Could not find ACPI IPMI interface type\n");
2271 info->si_type = SI_KCS;
2274 info->si_type = SI_SMIC;
2277 info->si_type = SI_BT;
2279 case 4: /* SSIF, just ignore */
2283 dev_info(&dev->dev, "unknown IPMI type %lld\n", tmp);
2287 res = pnp_get_resource(dev, IORESOURCE_IO, 0);
2289 info->io_setup = port_setup;
2290 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2292 res = pnp_get_resource(dev, IORESOURCE_MEM, 0);
2294 info->io_setup = mem_setup;
2295 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2299 dev_err(&dev->dev, "no I/O or memory address\n");
2302 info->io.addr_data = res->start;
2304 info->io.regspacing = DEFAULT_REGSPACING;
2305 res_second = pnp_get_resource(dev,
2306 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ?
2307 IORESOURCE_IO : IORESOURCE_MEM,
2310 if (res_second->start > info->io.addr_data)
2311 info->io.regspacing = res_second->start - info->io.addr_data;
2313 info->io.regsize = DEFAULT_REGSPACING;
2314 info->io.regshift = 0;
2316 /* If _GPE exists, use it; otherwise use standard interrupts */
2317 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
2318 if (ACPI_SUCCESS(status)) {
2320 info->irq_setup = acpi_gpe_irq_setup;
2321 } else if (pnp_irq_valid(dev, 0)) {
2322 info->irq = pnp_irq(dev, 0);
2323 info->irq_setup = std_irq_setup;
2326 info->dev = &dev->dev;
2327 pnp_set_drvdata(dev, info);
2329 dev_info(info->dev, "%pR regsize %d spacing %d irq %d\n",
2330 res, info->io.regsize, info->io.regspacing,
2344 static void ipmi_pnp_remove(struct pnp_dev *dev)
2346 struct smi_info *info = pnp_get_drvdata(dev);
2348 cleanup_one_si(info);
2351 static const struct pnp_device_id pnp_dev_table[] = {
2356 static struct pnp_driver ipmi_pnp_driver = {
2357 .name = DEVICE_NAME,
2358 .probe = ipmi_pnp_probe,
2359 .remove = ipmi_pnp_remove,
2360 .id_table = pnp_dev_table,
2363 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
2367 struct dmi_ipmi_data {
2370 unsigned long base_addr;
2376 static int decode_dmi(const struct dmi_header *dm,
2377 struct dmi_ipmi_data *dmi)
2379 const u8 *data = (const u8 *)dm;
2380 unsigned long base_addr;
2382 u8 len = dm->length;
2384 dmi->type = data[4];
2386 memcpy(&base_addr, data+8, sizeof(unsigned long));
2388 if (base_addr & 1) {
2390 base_addr &= 0xFFFE;
2391 dmi->addr_space = IPMI_IO_ADDR_SPACE;
2394 dmi->addr_space = IPMI_MEM_ADDR_SPACE;
2396 /* If bit 4 of byte 0x10 is set, then the lsb for the address
2398 dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
2400 dmi->irq = data[0x11];
2402 /* The top two bits of byte 0x10 hold the register spacing. */
2403 reg_spacing = (data[0x10] & 0xC0) >> 6;
2404 switch (reg_spacing) {
2405 case 0x00: /* Byte boundaries */
2408 case 0x01: /* 32-bit boundaries */
2411 case 0x02: /* 16-byte boundaries */
2415 /* Some other interface, just ignore it. */
2421 * Note that technically, the lower bit of the base
2422 * address should be 1 if the address is I/O and 0 if
2423 * the address is in memory. So many systems get that
2424 * wrong (and all that I have seen are I/O) so we just
2425 * ignore that bit and assume I/O. Systems that use
2426 * memory should use the newer spec, anyway.
2428 dmi->base_addr = base_addr & 0xfffe;
2429 dmi->addr_space = IPMI_IO_ADDR_SPACE;
2433 dmi->slave_addr = data[6];
2438 static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
2440 struct smi_info *info;
2442 info = smi_info_alloc();
2444 printk(KERN_ERR PFX "Could not allocate SI data\n");
2448 info->addr_source = SI_SMBIOS;
2449 printk(KERN_INFO PFX "probing via SMBIOS\n");
2451 switch (ipmi_data->type) {
2452 case 0x01: /* KCS */
2453 info->si_type = SI_KCS;
2455 case 0x02: /* SMIC */
2456 info->si_type = SI_SMIC;
2459 info->si_type = SI_BT;
2466 switch (ipmi_data->addr_space) {
2467 case IPMI_MEM_ADDR_SPACE:
2468 info->io_setup = mem_setup;
2469 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2472 case IPMI_IO_ADDR_SPACE:
2473 info->io_setup = port_setup;
2474 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2479 printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n",
2480 ipmi_data->addr_space);
2483 info->io.addr_data = ipmi_data->base_addr;
2485 info->io.regspacing = ipmi_data->offset;
2486 if (!info->io.regspacing)
2487 info->io.regspacing = DEFAULT_REGSPACING;
2488 info->io.regsize = DEFAULT_REGSPACING;
2489 info->io.regshift = 0;
2491 info->slave_addr = ipmi_data->slave_addr;
2493 info->irq = ipmi_data->irq;
2495 info->irq_setup = std_irq_setup;
2497 pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n",
2498 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2499 info->io.addr_data, info->io.regsize, info->io.regspacing,
2506 static void dmi_find_bmc(void)
2508 const struct dmi_device *dev = NULL;
2509 struct dmi_ipmi_data data;
2512 while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) {
2513 memset(&data, 0, sizeof(data));
2514 rv = decode_dmi((const struct dmi_header *) dev->device_data,
2517 try_init_dmi(&data);
2520 #endif /* CONFIG_DMI */
2524 #define PCI_ERMC_CLASSCODE 0x0C0700
2525 #define PCI_ERMC_CLASSCODE_MASK 0xffffff00
2526 #define PCI_ERMC_CLASSCODE_TYPE_MASK 0xff
2527 #define PCI_ERMC_CLASSCODE_TYPE_SMIC 0x00
2528 #define PCI_ERMC_CLASSCODE_TYPE_KCS 0x01
2529 #define PCI_ERMC_CLASSCODE_TYPE_BT 0x02
2531 #define PCI_HP_VENDOR_ID 0x103C
2532 #define PCI_MMC_DEVICE_ID 0x121A
2533 #define PCI_MMC_ADDR_CW 0x10
2535 static void ipmi_pci_cleanup(struct smi_info *info)
2537 struct pci_dev *pdev = info->addr_source_data;
2539 pci_disable_device(pdev);
2542 static int ipmi_pci_probe_regspacing(struct smi_info *info)
2544 if (info->si_type == SI_KCS) {
2545 unsigned char status;
2548 info->io.regsize = DEFAULT_REGSIZE;
2549 info->io.regshift = 0;
2551 info->handlers = &kcs_smi_handlers;
2553 /* detect 1, 4, 16byte spacing */
2554 for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
2555 info->io.regspacing = regspacing;
2556 if (info->io_setup(info)) {
2558 "Could not setup I/O space\n");
2559 return DEFAULT_REGSPACING;
2561 /* write invalid cmd */
2562 info->io.outputb(&info->io, 1, 0x10);
2563 /* read status back */
2564 status = info->io.inputb(&info->io, 1);
2565 info->io_cleanup(info);
2571 return DEFAULT_REGSPACING;
2574 static int ipmi_pci_probe(struct pci_dev *pdev,
2575 const struct pci_device_id *ent)
2578 int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
2579 struct smi_info *info;
2581 info = smi_info_alloc();
2585 info->addr_source = SI_PCI;
2586 dev_info(&pdev->dev, "probing via PCI");
2588 switch (class_type) {
2589 case PCI_ERMC_CLASSCODE_TYPE_SMIC:
2590 info->si_type = SI_SMIC;
2593 case PCI_ERMC_CLASSCODE_TYPE_KCS:
2594 info->si_type = SI_KCS;
2597 case PCI_ERMC_CLASSCODE_TYPE_BT:
2598 info->si_type = SI_BT;
2603 dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type);
2607 rv = pci_enable_device(pdev);
2609 dev_err(&pdev->dev, "couldn't enable PCI device\n");
2614 info->addr_source_cleanup = ipmi_pci_cleanup;
2615 info->addr_source_data = pdev;
2617 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
2618 info->io_setup = port_setup;
2619 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2621 info->io_setup = mem_setup;
2622 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2624 info->io.addr_data = pci_resource_start(pdev, 0);
2626 info->io.regspacing = ipmi_pci_probe_regspacing(info);
2627 info->io.regsize = DEFAULT_REGSIZE;
2628 info->io.regshift = 0;
2630 info->irq = pdev->irq;
2632 info->irq_setup = std_irq_setup;
2634 info->dev = &pdev->dev;
2635 pci_set_drvdata(pdev, info);
2637 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
2638 &pdev->resource[0], info->io.regsize, info->io.regspacing,
2644 pci_disable_device(pdev);
2650 static void ipmi_pci_remove(struct pci_dev *pdev)
2652 struct smi_info *info = pci_get_drvdata(pdev);
2653 cleanup_one_si(info);
2654 pci_disable_device(pdev);
2657 static struct pci_device_id ipmi_pci_devices[] = {
2658 { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) },
2659 { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) },
2662 MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);
2664 static struct pci_driver ipmi_pci_driver = {
2665 .name = DEVICE_NAME,
2666 .id_table = ipmi_pci_devices,
2667 .probe = ipmi_pci_probe,
2668 .remove = ipmi_pci_remove,
2670 #endif /* CONFIG_PCI */
2672 static const struct of_device_id ipmi_match[];
2673 static int ipmi_probe(struct platform_device *dev)
2676 const struct of_device_id *match;
2677 struct smi_info *info;
2678 struct resource resource;
2679 const __be32 *regsize, *regspacing, *regshift;
2680 struct device_node *np = dev->dev.of_node;
2684 dev_info(&dev->dev, "probing via device tree\n");
2686 match = of_match_device(ipmi_match, &dev->dev);
2690 if (!of_device_is_available(np))
2693 ret = of_address_to_resource(np, 0, &resource);
2695 dev_warn(&dev->dev, PFX "invalid address from OF\n");
2699 regsize = of_get_property(np, "reg-size", &proplen);
2700 if (regsize && proplen != 4) {
2701 dev_warn(&dev->dev, PFX "invalid regsize from OF\n");
2705 regspacing = of_get_property(np, "reg-spacing", &proplen);
2706 if (regspacing && proplen != 4) {
2707 dev_warn(&dev->dev, PFX "invalid regspacing from OF\n");
2711 regshift = of_get_property(np, "reg-shift", &proplen);
2712 if (regshift && proplen != 4) {
2713 dev_warn(&dev->dev, PFX "invalid regshift from OF\n");
2717 info = smi_info_alloc();
2721 "could not allocate memory for OF probe\n");
2725 info->si_type = (enum si_type) match->data;
2726 info->addr_source = SI_DEVICETREE;
2727 info->irq_setup = std_irq_setup;
2729 if (resource.flags & IORESOURCE_IO) {
2730 info->io_setup = port_setup;
2731 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2733 info->io_setup = mem_setup;
2734 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2737 info->io.addr_data = resource.start;
2739 info->io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
2740 info->io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
2741 info->io.regshift = regshift ? be32_to_cpup(regshift) : 0;
2743 info->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
2744 info->dev = &dev->dev;
2746 dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
2747 info->io.addr_data, info->io.regsize, info->io.regspacing,
2750 dev_set_drvdata(&dev->dev, info);
2752 ret = add_smi(info);
2761 static int ipmi_remove(struct platform_device *dev)
2764 cleanup_one_si(dev_get_drvdata(&dev->dev));
2769 static const struct of_device_id ipmi_match[] =
2771 { .type = "ipmi", .compatible = "ipmi-kcs",
2772 .data = (void *)(unsigned long) SI_KCS },
2773 { .type = "ipmi", .compatible = "ipmi-smic",
2774 .data = (void *)(unsigned long) SI_SMIC },
2775 { .type = "ipmi", .compatible = "ipmi-bt",
2776 .data = (void *)(unsigned long) SI_BT },
2780 static struct platform_driver ipmi_driver = {
2782 .name = DEVICE_NAME,
2783 .of_match_table = ipmi_match,
2785 .probe = ipmi_probe,
2786 .remove = ipmi_remove,
2789 #ifdef CONFIG_PARISC
2790 static int ipmi_parisc_probe(struct parisc_device *dev)
2792 struct smi_info *info;
2795 info = smi_info_alloc();
2799 "could not allocate memory for PARISC probe\n");
2803 info->si_type = SI_KCS;
2804 info->addr_source = SI_DEVICETREE;
2805 info->io_setup = mem_setup;
2806 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2807 info->io.addr_data = dev->hpa.start;
2808 info->io.regsize = 1;
2809 info->io.regspacing = 1;
2810 info->io.regshift = 0;
2811 info->irq = 0; /* no interrupt */
2812 info->irq_setup = NULL;
2813 info->dev = &dev->dev;
2815 dev_dbg(&dev->dev, "addr 0x%lx\n", info->io.addr_data);
2817 dev_set_drvdata(&dev->dev, info);
2828 static int ipmi_parisc_remove(struct parisc_device *dev)
2830 cleanup_one_si(dev_get_drvdata(&dev->dev));
2834 static struct parisc_device_id ipmi_parisc_tbl[] = {
2835 { HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 },
2839 static struct parisc_driver ipmi_parisc_driver = {
2841 .id_table = ipmi_parisc_tbl,
2842 .probe = ipmi_parisc_probe,
2843 .remove = ipmi_parisc_remove,
2845 #endif /* CONFIG_PARISC */
2847 static int wait_for_msg_done(struct smi_info *smi_info)
2849 enum si_sm_result smi_result;
2851 smi_result = smi_info->handlers->event(smi_info->si_sm, 0);
2853 if (smi_result == SI_SM_CALL_WITH_DELAY ||
2854 smi_result == SI_SM_CALL_WITH_TICK_DELAY) {
2855 schedule_timeout_uninterruptible(1);
2856 smi_result = smi_info->handlers->event(
2857 smi_info->si_sm, jiffies_to_usecs(1));
2858 } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) {
2859 smi_result = smi_info->handlers->event(
2860 smi_info->si_sm, 0);
2864 if (smi_result == SI_SM_HOSED)
2866 * We couldn't get the state machine to run, so whatever's at
2867 * the port is probably not an IPMI SMI interface.
2874 static int try_get_dev_id(struct smi_info *smi_info)
2876 unsigned char msg[2];
2877 unsigned char *resp;
2878 unsigned long resp_len;
2881 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2886 * Do a Get Device ID command, since it comes back with some
2889 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2890 msg[1] = IPMI_GET_DEVICE_ID_CMD;
2891 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2893 rv = wait_for_msg_done(smi_info);
2897 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2898 resp, IPMI_MAX_MSG_LENGTH);
2900 /* Check and record info from the get device id, in case we need it. */
2901 rv = ipmi_demangle_device_id(resp, resp_len, &smi_info->device_id);
2909 * Some BMCs do not support clearing the receive irq bit in the global
2910 * enables (even if they don't support interrupts on the BMC). Check
2911 * for this and handle it properly.
2913 static void check_clr_rcv_irq(struct smi_info *smi_info)
2915 unsigned char msg[3];
2916 unsigned char *resp;
2917 unsigned long resp_len;
2920 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2922 printk(KERN_WARNING PFX "Out of memory allocating response for"
2923 " global enables command, cannot check recv irq bit"
2928 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2929 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
2930 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2932 rv = wait_for_msg_done(smi_info);
2934 printk(KERN_WARNING PFX "Error getting response from get"
2935 " global enables command, cannot check recv irq bit"
2940 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2941 resp, IPMI_MAX_MSG_LENGTH);
2944 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2945 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
2947 printk(KERN_WARNING PFX "Invalid return from get global"
2948 " enables command, cannot check recv irq bit"
2954 if ((resp[3] & IPMI_BMC_RCV_MSG_INTR) == 0)
2955 /* Already clear, should work ok. */
2958 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2959 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
2960 msg[2] = resp[3] & ~IPMI_BMC_RCV_MSG_INTR;
2961 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
2963 rv = wait_for_msg_done(smi_info);
2965 printk(KERN_WARNING PFX "Error getting response from set"
2966 " global enables command, cannot check recv irq bit"
2971 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2972 resp, IPMI_MAX_MSG_LENGTH);
2975 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2976 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
2977 printk(KERN_WARNING PFX "Invalid return from get global"
2978 " enables command, cannot check recv irq bit"
2986 * An error when setting the event buffer bit means
2987 * clearing the bit is not supported.
2989 printk(KERN_WARNING PFX "The BMC does not support clearing"
2990 " the recv irq bit, compensating, but the BMC needs to"
2992 smi_info->cannot_clear_recv_irq_bit = true;
2998 static int try_enable_event_buffer(struct smi_info *smi_info)
3000 unsigned char msg[3];
3001 unsigned char *resp;
3002 unsigned long resp_len;
3005 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
3009 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
3010 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
3011 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
3013 rv = wait_for_msg_done(smi_info);
3015 printk(KERN_WARNING PFX "Error getting response from get"
3016 " global enables command, the event buffer is not"
3021 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
3022 resp, IPMI_MAX_MSG_LENGTH);
3025 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
3026 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
3028 printk(KERN_WARNING PFX "Invalid return from get global"
3029 " enables command, cannot enable the event buffer.\n");
3034 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
3035 /* buffer is already enabled, nothing to do. */
3036 smi_info->supports_event_msg_buff = true;
3040 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
3041 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
3042 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF;
3043 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
3045 rv = wait_for_msg_done(smi_info);
3047 printk(KERN_WARNING PFX "Error getting response from set"
3048 " global, enables command, the event buffer is not"
3053 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
3054 resp, IPMI_MAX_MSG_LENGTH);
3057 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
3058 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
3059 printk(KERN_WARNING PFX "Invalid return from get global,"
3060 "enables command, not enable the event buffer.\n");
3067 * An error when setting the event buffer bit means
3068 * that the event buffer is not supported.
3072 smi_info->supports_event_msg_buff = true;
3079 static int smi_type_proc_show(struct seq_file *m, void *v)
3081 struct smi_info *smi = m->private;
3083 seq_printf(m, "%s\n", si_to_str[smi->si_type]);
3088 static int smi_type_proc_open(struct inode *inode, struct file *file)
3090 return single_open(file, smi_type_proc_show, PDE_DATA(inode));
3093 static const struct file_operations smi_type_proc_ops = {
3094 .open = smi_type_proc_open,
3096 .llseek = seq_lseek,
3097 .release = single_release,
3100 static int smi_si_stats_proc_show(struct seq_file *m, void *v)
3102 struct smi_info *smi = m->private;
3104 seq_printf(m, "interrupts_enabled: %d\n",
3105 smi->irq && !smi->interrupt_disabled);
3106 seq_printf(m, "short_timeouts: %u\n",
3107 smi_get_stat(smi, short_timeouts));
3108 seq_printf(m, "long_timeouts: %u\n",
3109 smi_get_stat(smi, long_timeouts));
3110 seq_printf(m, "idles: %u\n",
3111 smi_get_stat(smi, idles));
3112 seq_printf(m, "interrupts: %u\n",
3113 smi_get_stat(smi, interrupts));
3114 seq_printf(m, "attentions: %u\n",
3115 smi_get_stat(smi, attentions));
3116 seq_printf(m, "flag_fetches: %u\n",
3117 smi_get_stat(smi, flag_fetches));
3118 seq_printf(m, "hosed_count: %u\n",
3119 smi_get_stat(smi, hosed_count));
3120 seq_printf(m, "complete_transactions: %u\n",
3121 smi_get_stat(smi, complete_transactions));
3122 seq_printf(m, "events: %u\n",
3123 smi_get_stat(smi, events));
3124 seq_printf(m, "watchdog_pretimeouts: %u\n",
3125 smi_get_stat(smi, watchdog_pretimeouts));
3126 seq_printf(m, "incoming_messages: %u\n",
3127 smi_get_stat(smi, incoming_messages));
3131 static int smi_si_stats_proc_open(struct inode *inode, struct file *file)
3133 return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode));
3136 static const struct file_operations smi_si_stats_proc_ops = {
3137 .open = smi_si_stats_proc_open,
3139 .llseek = seq_lseek,
3140 .release = single_release,
3143 static int smi_params_proc_show(struct seq_file *m, void *v)
3145 struct smi_info *smi = m->private;
3148 "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n",
3149 si_to_str[smi->si_type],
3150 addr_space_to_str[smi->io.addr_type],
3161 static int smi_params_proc_open(struct inode *inode, struct file *file)
3163 return single_open(file, smi_params_proc_show, PDE_DATA(inode));
3166 static const struct file_operations smi_params_proc_ops = {
3167 .open = smi_params_proc_open,
3169 .llseek = seq_lseek,
3170 .release = single_release,
3174 * oem_data_avail_to_receive_msg_avail
3175 * @info - smi_info structure with msg_flags set
3177 * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL
3178 * Returns 1 indicating need to re-run handle_flags().
3180 static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info)
3182 smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) |
3188 * setup_dell_poweredge_oem_data_handler
3189 * @info - smi_info.device_id must be populated
3191 * Systems that match, but have firmware version < 1.40 may assert
3192 * OEM0_DATA_AVAIL on their own, without being told via Set Flags that
3193 * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL
3194 * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags
3195 * as RECEIVE_MSG_AVAIL instead.
3197 * As Dell has no plans to release IPMI 1.5 firmware that *ever*
3198 * assert the OEM[012] bits, and if it did, the driver would have to
3199 * change to handle that properly, we don't actually check for the
3201 * Device ID = 0x20 BMC on PowerEdge 8G servers
3202 * Device Revision = 0x80
3203 * Firmware Revision1 = 0x01 BMC version 1.40
3204 * Firmware Revision2 = 0x40 BCD encoded
3205 * IPMI Version = 0x51 IPMI 1.5
3206 * Manufacturer ID = A2 02 00 Dell IANA
3208 * Additionally, PowerEdge systems with IPMI < 1.5 may also assert
3209 * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL.
3212 #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20
3213 #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80
3214 #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51
3215 #define DELL_IANA_MFR_ID 0x0002a2
3216 static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info)
3218 struct ipmi_device_id *id = &smi_info->device_id;
3219 if (id->manufacturer_id == DELL_IANA_MFR_ID) {
3220 if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID &&
3221 id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV &&
3222 id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) {
3223 smi_info->oem_data_avail_handler =
3224 oem_data_avail_to_receive_msg_avail;
3225 } else if (ipmi_version_major(id) < 1 ||
3226 (ipmi_version_major(id) == 1 &&
3227 ipmi_version_minor(id) < 5)) {
3228 smi_info->oem_data_avail_handler =
3229 oem_data_avail_to_receive_msg_avail;
3234 #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA
3235 static void return_hosed_msg_badsize(struct smi_info *smi_info)
3237 struct ipmi_smi_msg *msg = smi_info->curr_msg;
3239 /* Make it a response */
3240 msg->rsp[0] = msg->data[0] | 4;
3241 msg->rsp[1] = msg->data[1];
3242 msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH;
3244 smi_info->curr_msg = NULL;
3245 deliver_recv_msg(smi_info, msg);
3249 * dell_poweredge_bt_xaction_handler
3250 * @info - smi_info.device_id must be populated
3252 * Dell PowerEdge servers with the BT interface (x6xx and 1750) will
3253 * not respond to a Get SDR command if the length of the data
3254 * requested is exactly 0x3A, which leads to command timeouts and no
3255 * data returned. This intercepts such commands, and causes userspace
3256 * callers to try again with a different-sized buffer, which succeeds.
3259 #define STORAGE_NETFN 0x0A
3260 #define STORAGE_CMD_GET_SDR 0x23
3261 static int dell_poweredge_bt_xaction_handler(struct notifier_block *self,
3262 unsigned long unused,
3265 struct smi_info *smi_info = in;
3266 unsigned char *data = smi_info->curr_msg->data;
3267 unsigned int size = smi_info->curr_msg->data_size;
3269 (data[0]>>2) == STORAGE_NETFN &&
3270 data[1] == STORAGE_CMD_GET_SDR &&
3272 return_hosed_msg_badsize(smi_info);
3278 static struct notifier_block dell_poweredge_bt_xaction_notifier = {
3279 .notifier_call = dell_poweredge_bt_xaction_handler,
3283 * setup_dell_poweredge_bt_xaction_handler
3284 * @info - smi_info.device_id must be filled in already
3286 * Fills in smi_info.device_id.start_transaction_pre_hook
3287 * when we know what function to use there.
3290 setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info)
3292 struct ipmi_device_id *id = &smi_info->device_id;
3293 if (id->manufacturer_id == DELL_IANA_MFR_ID &&
3294 smi_info->si_type == SI_BT)
3295 register_xaction_notifier(&dell_poweredge_bt_xaction_notifier);
3299 * setup_oem_data_handler
3300 * @info - smi_info.device_id must be filled in already
3302 * Fills in smi_info.device_id.oem_data_available_handler
3303 * when we know what function to use there.
3306 static void setup_oem_data_handler(struct smi_info *smi_info)
3308 setup_dell_poweredge_oem_data_handler(smi_info);
3311 static void setup_xaction_handlers(struct smi_info *smi_info)
3313 setup_dell_poweredge_bt_xaction_handler(smi_info);
3316 static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
3318 if (smi_info->thread != NULL)
3319 kthread_stop(smi_info->thread);
3320 if (smi_info->timer_running)
3321 del_timer_sync(&smi_info->si_timer);
3324 static struct ipmi_default_vals
3330 { .type = SI_KCS, .port = 0xca2 },
3331 { .type = SI_SMIC, .port = 0xca9 },
3332 { .type = SI_BT, .port = 0xe4 },
3336 static void default_find_bmc(void)
3338 struct smi_info *info;
3341 for (i = 0; ; i++) {
3342 if (!ipmi_defaults[i].port)
3345 if (check_legacy_ioport(ipmi_defaults[i].port))
3348 info = smi_info_alloc();
3352 info->addr_source = SI_DEFAULT;
3354 info->si_type = ipmi_defaults[i].type;
3355 info->io_setup = port_setup;
3356 info->io.addr_data = ipmi_defaults[i].port;
3357 info->io.addr_type = IPMI_IO_ADDR_SPACE;
3359 info->io.addr = NULL;
3360 info->io.regspacing = DEFAULT_REGSPACING;
3361 info->io.regsize = DEFAULT_REGSPACING;
3362 info->io.regshift = 0;
3364 if (add_smi(info) == 0) {
3365 if ((try_smi_init(info)) == 0) {
3367 printk(KERN_INFO PFX "Found default %s"
3368 " state machine at %s address 0x%lx\n",
3369 si_to_str[info->si_type],
3370 addr_space_to_str[info->io.addr_type],
3371 info->io.addr_data);
3373 cleanup_one_si(info);
3380 static int is_new_interface(struct smi_info *info)
3384 list_for_each_entry(e, &smi_infos, link) {
3385 if (e->io.addr_type != info->io.addr_type)
3387 if (e->io.addr_data == info->io.addr_data)
3394 static int add_smi(struct smi_info *new_smi)
3398 printk(KERN_INFO PFX "Adding %s-specified %s state machine",
3399 ipmi_addr_src_to_str(new_smi->addr_source),
3400 si_to_str[new_smi->si_type]);
3401 mutex_lock(&smi_infos_lock);
3402 if (!is_new_interface(new_smi)) {
3403 printk(KERN_CONT " duplicate interface\n");
3408 printk(KERN_CONT "\n");
3410 /* So we know not to free it unless we have allocated one. */
3411 new_smi->intf = NULL;
3412 new_smi->si_sm = NULL;
3413 new_smi->handlers = NULL;
3415 list_add_tail(&new_smi->link, &smi_infos);
3418 mutex_unlock(&smi_infos_lock);
3422 static int try_smi_init(struct smi_info *new_smi)
3427 printk(KERN_INFO PFX "Trying %s-specified %s state"
3428 " machine at %s address 0x%lx, slave address 0x%x,"
3430 ipmi_addr_src_to_str(new_smi->addr_source),
3431 si_to_str[new_smi->si_type],
3432 addr_space_to_str[new_smi->io.addr_type],
3433 new_smi->io.addr_data,
3434 new_smi->slave_addr, new_smi->irq);
3436 switch (new_smi->si_type) {
3438 new_smi->handlers = &kcs_smi_handlers;
3442 new_smi->handlers = &smic_smi_handlers;
3446 new_smi->handlers = &bt_smi_handlers;
3450 /* No support for anything else yet. */
3455 /* Allocate the state machine's data and initialize it. */
3456 new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL);
3457 if (!new_smi->si_sm) {
3459 "Could not allocate state machine memory\n");
3463 new_smi->io_size = new_smi->handlers->init_data(new_smi->si_sm,
3466 /* Now that we know the I/O size, we can set up the I/O. */
3467 rv = new_smi->io_setup(new_smi);
3469 printk(KERN_ERR PFX "Could not set up I/O space\n");
3473 /* Do low-level detection first. */
3474 if (new_smi->handlers->detect(new_smi->si_sm)) {
3475 if (new_smi->addr_source)
3476 printk(KERN_INFO PFX "Interface detection failed\n");
3482 * Attempt a get device id command. If it fails, we probably
3483 * don't have a BMC here.
3485 rv = try_get_dev_id(new_smi);
3487 if (new_smi->addr_source)
3488 printk(KERN_INFO PFX "There appears to be no BMC"
3489 " at this location\n");
3493 check_clr_rcv_irq(new_smi);
3495 setup_oem_data_handler(new_smi);
3496 setup_xaction_handlers(new_smi);
3498 new_smi->waiting_msg = NULL;
3499 new_smi->curr_msg = NULL;
3500 atomic_set(&new_smi->req_events, 0);
3501 new_smi->run_to_completion = false;
3502 for (i = 0; i < SI_NUM_STATS; i++)
3503 atomic_set(&new_smi->stats[i], 0);
3505 new_smi->interrupt_disabled = true;
3506 atomic_set(&new_smi->need_watch, 0);
3507 new_smi->intf_num = smi_num;
3510 rv = try_enable_event_buffer(new_smi);
3512 new_smi->has_event_buffer = true;
3515 * Start clearing the flags before we enable interrupts or the
3516 * timer to avoid racing with the timer.
3518 start_clear_flags(new_smi);
3521 * IRQ is defined to be set when non-zero. req_events will
3522 * cause a global flags check that will enable interrupts.
3525 new_smi->interrupt_disabled = false;
3526 atomic_set(&new_smi->req_events, 1);
3529 if (!new_smi->dev) {
3531 * If we don't already have a device from something
3532 * else (like PCI), then register a new one.
3534 new_smi->pdev = platform_device_alloc("ipmi_si",
3536 if (!new_smi->pdev) {
3538 "Unable to allocate platform device\n");
3541 new_smi->dev = &new_smi->pdev->dev;
3542 new_smi->dev->driver = &ipmi_driver.driver;
3544 rv = platform_device_add(new_smi->pdev);
3547 "Unable to register system interface device:"
3552 new_smi->dev_registered = true;
3555 rv = ipmi_register_smi(&handlers,
3557 &new_smi->device_id,
3559 new_smi->slave_addr);
3561 dev_err(new_smi->dev, "Unable to register device: error %d\n",
3563 goto out_err_stop_timer;
3566 rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
3570 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3571 goto out_err_stop_timer;
3574 rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
3575 &smi_si_stats_proc_ops,
3578 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3579 goto out_err_stop_timer;
3582 rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
3583 &smi_params_proc_ops,
3586 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3587 goto out_err_stop_timer;
3590 dev_info(new_smi->dev, "IPMI %s interface initialized\n",
3591 si_to_str[new_smi->si_type]);
3596 wait_for_timer_and_thread(new_smi);
3599 new_smi->interrupt_disabled = true;
3601 if (new_smi->intf) {
3602 ipmi_smi_t intf = new_smi->intf;
3603 new_smi->intf = NULL;
3604 ipmi_unregister_smi(intf);
3607 if (new_smi->irq_cleanup) {
3608 new_smi->irq_cleanup(new_smi);
3609 new_smi->irq_cleanup = NULL;
3613 * Wait until we know that we are out of any interrupt
3614 * handlers might have been running before we freed the
3617 synchronize_sched();
3619 if (new_smi->si_sm) {
3620 if (new_smi->handlers)
3621 new_smi->handlers->cleanup(new_smi->si_sm);
3622 kfree(new_smi->si_sm);
3623 new_smi->si_sm = NULL;
3625 if (new_smi->addr_source_cleanup) {
3626 new_smi->addr_source_cleanup(new_smi);
3627 new_smi->addr_source_cleanup = NULL;
3629 if (new_smi->io_cleanup) {
3630 new_smi->io_cleanup(new_smi);
3631 new_smi->io_cleanup = NULL;
3634 if (new_smi->dev_registered) {
3635 platform_device_unregister(new_smi->pdev);
3636 new_smi->dev_registered = false;
3642 static int init_ipmi_si(void)
3648 enum ipmi_addr_src type = SI_INVALID;
3654 if (si_tryplatform) {
3655 rv = platform_driver_register(&ipmi_driver);
3657 printk(KERN_ERR PFX "Unable to register "
3658 "driver: %d\n", rv);
3663 /* Parse out the si_type string into its components. */
3666 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
3668 str = strchr(str, ',');
3678 printk(KERN_INFO "IPMI System Interface driver.\n");
3680 /* If the user gave us a device, they presumably want us to use it */
3681 if (!hardcode_find_bmc())
3686 rv = pci_register_driver(&ipmi_pci_driver);
3688 printk(KERN_ERR PFX "Unable to register "
3689 "PCI driver: %d\n", rv);
3691 pci_registered = true;
3697 pnp_register_driver(&ipmi_pnp_driver);
3698 pnp_registered = true;
3712 #ifdef CONFIG_PARISC
3713 register_parisc_driver(&ipmi_parisc_driver);
3714 parisc_registered = true;
3715 /* poking PC IO addresses will crash machine, don't do it */
3719 /* We prefer devices with interrupts, but in the case of a machine
3720 with multiple BMCs we assume that there will be several instances
3721 of a given type so if we succeed in registering a type then also
3722 try to register everything else of the same type */
3724 mutex_lock(&smi_infos_lock);
3725 list_for_each_entry(e, &smi_infos, link) {
3726 /* Try to register a device if it has an IRQ and we either
3727 haven't successfully registered a device yet or this
3728 device has the same type as one we successfully registered */
3729 if (e->irq && (!type || e->addr_source == type)) {
3730 if (!try_smi_init(e)) {
3731 type = e->addr_source;
3736 /* type will only have been set if we successfully registered an si */
3738 mutex_unlock(&smi_infos_lock);
3742 /* Fall back to the preferred device */
3744 list_for_each_entry(e, &smi_infos, link) {
3745 if (!e->irq && (!type || e->addr_source == type)) {
3746 if (!try_smi_init(e)) {
3747 type = e->addr_source;
3751 mutex_unlock(&smi_infos_lock);
3756 if (si_trydefaults) {
3757 mutex_lock(&smi_infos_lock);
3758 if (list_empty(&smi_infos)) {
3759 /* No BMC was found, try defaults. */
3760 mutex_unlock(&smi_infos_lock);
3763 mutex_unlock(&smi_infos_lock);
3766 mutex_lock(&smi_infos_lock);
3767 if (unload_when_empty && list_empty(&smi_infos)) {
3768 mutex_unlock(&smi_infos_lock);
3770 printk(KERN_WARNING PFX
3771 "Unable to find any System Interface(s)\n");
3774 mutex_unlock(&smi_infos_lock);
3778 module_init(init_ipmi_si);
3780 static void cleanup_one_si(struct smi_info *to_clean)
3787 if (to_clean->intf) {
3788 ipmi_smi_t intf = to_clean->intf;
3790 to_clean->intf = NULL;
3791 rv = ipmi_unregister_smi(intf);
3793 pr_err(PFX "Unable to unregister device: errno=%d\n",
3799 dev_set_drvdata(to_clean->dev, NULL);
3801 list_del(&to_clean->link);
3804 * Make sure that interrupts, the timer and the thread are
3805 * stopped and will not run again.
3807 if (to_clean->irq_cleanup)
3808 to_clean->irq_cleanup(to_clean);
3809 wait_for_timer_and_thread(to_clean);
3812 * Timeouts are stopped, now make sure the interrupts are off
3813 * in the BMC. Note that timers and CPU interrupts are off,
3814 * so no need for locks.
3816 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
3818 schedule_timeout_uninterruptible(1);
3820 disable_si_irq(to_clean);
3821 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
3823 schedule_timeout_uninterruptible(1);
3826 if (to_clean->handlers)
3827 to_clean->handlers->cleanup(to_clean->si_sm);
3829 kfree(to_clean->si_sm);
3831 if (to_clean->addr_source_cleanup)
3832 to_clean->addr_source_cleanup(to_clean);
3833 if (to_clean->io_cleanup)
3834 to_clean->io_cleanup(to_clean);
3836 if (to_clean->dev_registered)
3837 platform_device_unregister(to_clean->pdev);
3842 static void cleanup_ipmi_si(void)
3844 struct smi_info *e, *tmp_e;
3851 pci_unregister_driver(&ipmi_pci_driver);
3855 pnp_unregister_driver(&ipmi_pnp_driver);
3857 #ifdef CONFIG_PARISC
3858 if (parisc_registered)
3859 unregister_parisc_driver(&ipmi_parisc_driver);
3862 platform_driver_unregister(&ipmi_driver);
3864 mutex_lock(&smi_infos_lock);
3865 list_for_each_entry_safe(e, tmp_e, &smi_infos, link)
3867 mutex_unlock(&smi_infos_lock);
3869 module_exit(cleanup_ipmi_si);
3871 MODULE_LICENSE("GPL");
3872 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
3873 MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT"
3874 " system interfaces.");