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 * Did we get an attention that we did not handle?
270 /* From the get device id response... */
271 struct ipmi_device_id device_id;
273 /* Driver model stuff. */
275 struct platform_device *pdev;
278 * True if we allocated the device, false if it came from
279 * someplace else (like PCI).
283 /* Slave address, could be reported from DMI. */
284 unsigned char slave_addr;
286 /* Counters and things for the proc filesystem. */
287 atomic_t stats[SI_NUM_STATS];
289 struct task_struct *thread;
291 struct list_head link;
292 union ipmi_smi_info_union addr_info;
295 #define smi_inc_stat(smi, stat) \
296 atomic_inc(&(smi)->stats[SI_STAT_ ## stat])
297 #define smi_get_stat(smi, stat) \
298 ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat]))
300 #define SI_MAX_PARMS 4
302 static int force_kipmid[SI_MAX_PARMS];
303 static int num_force_kipmid;
305 static bool pci_registered;
308 static bool pnp_registered;
311 static bool parisc_registered;
314 static unsigned int kipmid_max_busy_us[SI_MAX_PARMS];
315 static int num_max_busy_us;
317 static bool unload_when_empty = true;
319 static int add_smi(struct smi_info *smi);
320 static int try_smi_init(struct smi_info *smi);
321 static void cleanup_one_si(struct smi_info *to_clean);
322 static void cleanup_ipmi_si(void);
324 static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list);
325 static int register_xaction_notifier(struct notifier_block *nb)
327 return atomic_notifier_chain_register(&xaction_notifier_list, nb);
330 static void deliver_recv_msg(struct smi_info *smi_info,
331 struct ipmi_smi_msg *msg)
333 /* Deliver the message to the upper layer. */
335 ipmi_smi_msg_received(smi_info->intf, msg);
337 ipmi_free_smi_msg(msg);
340 static void return_hosed_msg(struct smi_info *smi_info, int cCode)
342 struct ipmi_smi_msg *msg = smi_info->curr_msg;
344 if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED)
345 cCode = IPMI_ERR_UNSPECIFIED;
346 /* else use it as is */
348 /* Make it a response */
349 msg->rsp[0] = msg->data[0] | 4;
350 msg->rsp[1] = msg->data[1];
354 smi_info->curr_msg = NULL;
355 deliver_recv_msg(smi_info, msg);
358 static enum si_sm_result start_next_msg(struct smi_info *smi_info)
365 if (!smi_info->waiting_msg) {
366 smi_info->curr_msg = NULL;
371 smi_info->curr_msg = smi_info->waiting_msg;
372 smi_info->waiting_msg = NULL;
375 printk(KERN_DEBUG "**Start2: %d.%9.9d\n", t.tv_sec, t.tv_usec);
377 err = atomic_notifier_call_chain(&xaction_notifier_list,
379 if (err & NOTIFY_STOP_MASK) {
380 rv = SI_SM_CALL_WITHOUT_DELAY;
383 err = smi_info->handlers->start_transaction(
385 smi_info->curr_msg->data,
386 smi_info->curr_msg->data_size);
388 return_hosed_msg(smi_info, err);
390 rv = SI_SM_CALL_WITHOUT_DELAY;
396 static void start_check_enables(struct smi_info *smi_info)
398 unsigned char msg[2];
400 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
401 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
403 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
404 smi_info->si_state = SI_CHECKING_ENABLES;
407 static void start_clear_flags(struct smi_info *smi_info)
409 unsigned char msg[3];
411 /* Make sure the watchdog pre-timeout flag is not set at startup. */
412 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
413 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
414 msg[2] = WDT_PRE_TIMEOUT_INT;
416 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
417 smi_info->si_state = SI_CLEARING_FLAGS;
420 static void start_getting_msg_queue(struct smi_info *smi_info)
422 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
423 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD;
424 smi_info->curr_msg->data_size = 2;
426 smi_info->handlers->start_transaction(
428 smi_info->curr_msg->data,
429 smi_info->curr_msg->data_size);
430 smi_info->si_state = SI_GETTING_MESSAGES;
433 static void start_getting_events(struct smi_info *smi_info)
435 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
436 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
437 smi_info->curr_msg->data_size = 2;
439 smi_info->handlers->start_transaction(
441 smi_info->curr_msg->data,
442 smi_info->curr_msg->data_size);
443 smi_info->si_state = SI_GETTING_EVENTS;
446 static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val)
448 smi_info->last_timeout_jiffies = jiffies;
449 mod_timer(&smi_info->si_timer, new_val);
450 smi_info->timer_running = true;
454 * When we have a situtaion where we run out of memory and cannot
455 * allocate messages, we just leave them in the BMC and run the system
456 * polled until we can allocate some memory. Once we have some
457 * memory, we will re-enable the interrupt.
459 static inline bool disable_si_irq(struct smi_info *smi_info)
461 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
462 smi_info->interrupt_disabled = true;
463 start_check_enables(smi_info);
469 static inline bool enable_si_irq(struct smi_info *smi_info)
471 if ((smi_info->irq) && (smi_info->interrupt_disabled)) {
472 smi_info->interrupt_disabled = false;
473 start_check_enables(smi_info);
480 * Allocate a message. If unable to allocate, start the interrupt
481 * disable process and return NULL. If able to allocate but
482 * interrupts are disabled, free the message and return NULL after
483 * starting the interrupt enable process.
485 static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info)
487 struct ipmi_smi_msg *msg;
489 msg = ipmi_alloc_smi_msg();
491 if (!disable_si_irq(smi_info))
492 smi_info->si_state = SI_NORMAL;
493 } else if (enable_si_irq(smi_info)) {
494 ipmi_free_smi_msg(msg);
500 static void handle_flags(struct smi_info *smi_info)
503 if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
504 /* Watchdog pre-timeout */
505 smi_inc_stat(smi_info, watchdog_pretimeouts);
507 start_clear_flags(smi_info);
508 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
510 ipmi_smi_watchdog_pretimeout(smi_info->intf);
511 } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) {
512 /* Messages available. */
513 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
514 if (!smi_info->curr_msg)
517 start_getting_msg_queue(smi_info);
518 } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) {
519 /* Events available. */
520 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
521 if (!smi_info->curr_msg)
524 start_getting_events(smi_info);
525 } else if (smi_info->msg_flags & OEM_DATA_AVAIL &&
526 smi_info->oem_data_avail_handler) {
527 if (smi_info->oem_data_avail_handler(smi_info))
530 smi_info->si_state = SI_NORMAL;
534 * Global enables we care about.
536 #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
537 IPMI_BMC_EVT_MSG_INTR)
539 static u8 current_global_enables(struct smi_info *smi_info, u8 base,
544 if (smi_info->supports_event_msg_buff)
545 enables |= IPMI_BMC_EVT_MSG_BUFF;
547 enables &= ~IPMI_BMC_EVT_MSG_BUFF;
549 if (smi_info->irq && !smi_info->interrupt_disabled)
550 enables |= IPMI_BMC_RCV_MSG_INTR;
552 enables &= ~IPMI_BMC_RCV_MSG_INTR;
554 if (smi_info->supports_event_msg_buff &&
555 smi_info->irq && !smi_info->interrupt_disabled)
557 enables |= IPMI_BMC_EVT_MSG_INTR;
559 enables &= ~IPMI_BMC_EVT_MSG_INTR;
561 *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR);
566 static void check_bt_irq(struct smi_info *smi_info, bool irq_on)
568 u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG);
570 irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT;
572 if ((bool)irqstate == irq_on)
576 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
577 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
579 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0);
582 static void handle_transaction_done(struct smi_info *smi_info)
584 struct ipmi_smi_msg *msg;
589 printk(KERN_DEBUG "**Done: %d.%9.9d\n", t.tv_sec, t.tv_usec);
591 switch (smi_info->si_state) {
593 if (!smi_info->curr_msg)
596 smi_info->curr_msg->rsp_size
597 = smi_info->handlers->get_result(
599 smi_info->curr_msg->rsp,
600 IPMI_MAX_MSG_LENGTH);
603 * Do this here becase deliver_recv_msg() releases the
604 * lock, and a new message can be put in during the
605 * time the lock is released.
607 msg = smi_info->curr_msg;
608 smi_info->curr_msg = NULL;
609 deliver_recv_msg(smi_info, msg);
612 case SI_GETTING_FLAGS:
614 unsigned char msg[4];
617 /* We got the flags from the SMI, now handle them. */
618 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
620 /* Error fetching flags, just give up for now. */
621 smi_info->si_state = SI_NORMAL;
622 } else if (len < 4) {
624 * Hmm, no flags. That's technically illegal, but
625 * don't use uninitialized data.
627 smi_info->si_state = SI_NORMAL;
629 smi_info->msg_flags = msg[3];
630 handle_flags(smi_info);
635 case SI_CLEARING_FLAGS:
637 unsigned char msg[3];
639 /* We cleared the flags. */
640 smi_info->handlers->get_result(smi_info->si_sm, msg, 3);
642 /* Error clearing flags */
643 dev_warn(smi_info->dev,
644 "Error clearing flags: %2.2x\n", msg[2]);
646 smi_info->si_state = SI_NORMAL;
650 case SI_GETTING_EVENTS:
652 smi_info->curr_msg->rsp_size
653 = smi_info->handlers->get_result(
655 smi_info->curr_msg->rsp,
656 IPMI_MAX_MSG_LENGTH);
659 * Do this here becase deliver_recv_msg() releases the
660 * lock, and a new message can be put in during the
661 * time the lock is released.
663 msg = smi_info->curr_msg;
664 smi_info->curr_msg = NULL;
665 if (msg->rsp[2] != 0) {
666 /* Error getting event, probably done. */
669 /* Take off the event flag. */
670 smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
671 handle_flags(smi_info);
673 smi_inc_stat(smi_info, events);
676 * Do this before we deliver the message
677 * because delivering the message releases the
678 * lock and something else can mess with the
681 handle_flags(smi_info);
683 deliver_recv_msg(smi_info, msg);
688 case SI_GETTING_MESSAGES:
690 smi_info->curr_msg->rsp_size
691 = smi_info->handlers->get_result(
693 smi_info->curr_msg->rsp,
694 IPMI_MAX_MSG_LENGTH);
697 * Do this here becase deliver_recv_msg() releases the
698 * lock, and a new message can be put in during the
699 * time the lock is released.
701 msg = smi_info->curr_msg;
702 smi_info->curr_msg = NULL;
703 if (msg->rsp[2] != 0) {
704 /* Error getting event, probably done. */
707 /* Take off the msg flag. */
708 smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
709 handle_flags(smi_info);
711 smi_inc_stat(smi_info, incoming_messages);
714 * Do this before we deliver the message
715 * because delivering the message releases the
716 * lock and something else can mess with the
719 handle_flags(smi_info);
721 deliver_recv_msg(smi_info, msg);
726 case SI_CHECKING_ENABLES:
728 unsigned char msg[4];
732 /* We got the flags from the SMI, now handle them. */
733 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
735 dev_warn(smi_info->dev,
736 "Couldn't get irq info: %x.\n", msg[2]);
737 dev_warn(smi_info->dev,
738 "Maybe ok, but ipmi might run very slowly.\n");
739 smi_info->si_state = SI_NORMAL;
742 enables = current_global_enables(smi_info, 0, &irq_on);
743 if (smi_info->si_type == SI_BT)
744 /* BT has its own interrupt enable bit. */
745 check_bt_irq(smi_info, irq_on);
746 if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) {
747 /* Enables are not correct, fix them. */
748 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
749 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
750 msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK);
751 smi_info->handlers->start_transaction(
752 smi_info->si_sm, msg, 3);
753 smi_info->si_state = SI_SETTING_ENABLES;
754 } else if (smi_info->supports_event_msg_buff) {
755 smi_info->curr_msg = ipmi_alloc_smi_msg();
756 if (!smi_info->curr_msg) {
757 smi_info->si_state = SI_NORMAL;
760 start_getting_msg_queue(smi_info);
762 smi_info->si_state = SI_NORMAL;
767 case SI_SETTING_ENABLES:
769 unsigned char msg[4];
771 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
773 dev_warn(smi_info->dev,
774 "Could not set the global enables: 0x%x.\n",
777 if (smi_info->supports_event_msg_buff) {
778 smi_info->curr_msg = ipmi_alloc_smi_msg();
779 if (!smi_info->curr_msg) {
780 smi_info->si_state = SI_NORMAL;
783 start_getting_msg_queue(smi_info);
785 smi_info->si_state = SI_NORMAL;
793 * Called on timeouts and events. Timeouts should pass the elapsed
794 * time, interrupts should pass in zero. Must be called with
795 * si_lock held and interrupts disabled.
797 static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
800 enum si_sm_result si_sm_result;
804 * There used to be a loop here that waited a little while
805 * (around 25us) before giving up. That turned out to be
806 * pointless, the minimum delays I was seeing were in the 300us
807 * range, which is far too long to wait in an interrupt. So
808 * we just run until the state machine tells us something
809 * happened or it needs a delay.
811 si_sm_result = smi_info->handlers->event(smi_info->si_sm, time);
813 while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY)
814 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
816 if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) {
817 smi_inc_stat(smi_info, complete_transactions);
819 handle_transaction_done(smi_info);
820 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
821 } else if (si_sm_result == SI_SM_HOSED) {
822 smi_inc_stat(smi_info, hosed_count);
825 * Do the before return_hosed_msg, because that
828 smi_info->si_state = SI_NORMAL;
829 if (smi_info->curr_msg != NULL) {
831 * If we were handling a user message, format
832 * a response to send to the upper layer to
833 * tell it about the error.
835 return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED);
837 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
841 * We prefer handling attn over new messages. But don't do
842 * this if there is not yet an upper layer to handle anything.
844 if (likely(smi_info->intf) &&
845 (si_sm_result == SI_SM_ATTN || smi_info->got_attn)) {
846 unsigned char msg[2];
848 if (smi_info->si_state != SI_NORMAL) {
850 * We got an ATTN, but we are doing something else.
851 * Handle the ATTN later.
853 smi_info->got_attn = true;
855 smi_info->got_attn = false;
856 smi_inc_stat(smi_info, attentions);
859 * Got a attn, send down a get message flags to see
860 * what's causing it. It would be better to handle
861 * this in the upper layer, but due to the way
862 * interrupts work with the SMI, that's not really
865 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
866 msg[1] = IPMI_GET_MSG_FLAGS_CMD;
868 smi_info->handlers->start_transaction(
869 smi_info->si_sm, msg, 2);
870 smi_info->si_state = SI_GETTING_FLAGS;
875 /* If we are currently idle, try to start the next message. */
876 if (si_sm_result == SI_SM_IDLE) {
877 smi_inc_stat(smi_info, idles);
879 si_sm_result = start_next_msg(smi_info);
880 if (si_sm_result != SI_SM_IDLE)
884 if ((si_sm_result == SI_SM_IDLE)
885 && (atomic_read(&smi_info->req_events))) {
887 * We are idle and the upper layer requested that I fetch
890 atomic_set(&smi_info->req_events, 0);
893 * Take this opportunity to check the interrupt and
894 * message enable state for the BMC. The BMC can be
895 * asynchronously reset, and may thus get interrupts
896 * disable and messages disabled.
898 if (smi_info->supports_event_msg_buff || smi_info->irq) {
899 start_check_enables(smi_info);
901 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
902 if (!smi_info->curr_msg)
905 start_getting_events(smi_info);
913 static void check_start_timer_thread(struct smi_info *smi_info)
915 if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
916 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
918 if (smi_info->thread)
919 wake_up_process(smi_info->thread);
921 start_next_msg(smi_info);
922 smi_event_handler(smi_info, 0);
926 static void sender(void *send_info,
927 struct ipmi_smi_msg *msg)
929 struct smi_info *smi_info = send_info;
930 enum si_sm_result result;
936 BUG_ON(smi_info->waiting_msg);
937 smi_info->waiting_msg = msg;
941 printk("**Enqueue: %d.%9.9d\n", t.tv_sec, t.tv_usec);
944 if (smi_info->run_to_completion) {
946 * If we are running to completion, start it and run
947 * transactions until everything is clear.
949 smi_info->curr_msg = smi_info->waiting_msg;
950 smi_info->waiting_msg = NULL;
953 * Run to completion means we are single-threaded, no
957 result = smi_event_handler(smi_info, 0);
958 while (result != SI_SM_IDLE) {
959 udelay(SI_SHORT_TIMEOUT_USEC);
960 result = smi_event_handler(smi_info,
961 SI_SHORT_TIMEOUT_USEC);
966 spin_lock_irqsave(&smi_info->si_lock, flags);
967 check_start_timer_thread(smi_info);
968 spin_unlock_irqrestore(&smi_info->si_lock, flags);
971 static void set_run_to_completion(void *send_info, bool i_run_to_completion)
973 struct smi_info *smi_info = send_info;
974 enum si_sm_result result;
976 smi_info->run_to_completion = i_run_to_completion;
977 if (i_run_to_completion) {
978 result = smi_event_handler(smi_info, 0);
979 while (result != SI_SM_IDLE) {
980 udelay(SI_SHORT_TIMEOUT_USEC);
981 result = smi_event_handler(smi_info,
982 SI_SHORT_TIMEOUT_USEC);
988 * Use -1 in the nsec value of the busy waiting timespec to tell that
989 * we are spinning in kipmid looking for something and not delaying
992 static inline void ipmi_si_set_not_busy(struct timespec *ts)
996 static inline int ipmi_si_is_busy(struct timespec *ts)
998 return ts->tv_nsec != -1;
1001 static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result,
1002 const struct smi_info *smi_info,
1003 struct timespec *busy_until)
1005 unsigned int max_busy_us = 0;
1007 if (smi_info->intf_num < num_max_busy_us)
1008 max_busy_us = kipmid_max_busy_us[smi_info->intf_num];
1009 if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY)
1010 ipmi_si_set_not_busy(busy_until);
1011 else if (!ipmi_si_is_busy(busy_until)) {
1012 getnstimeofday(busy_until);
1013 timespec_add_ns(busy_until, max_busy_us*NSEC_PER_USEC);
1015 struct timespec now;
1016 getnstimeofday(&now);
1017 if (unlikely(timespec_compare(&now, busy_until) > 0)) {
1018 ipmi_si_set_not_busy(busy_until);
1027 * A busy-waiting loop for speeding up IPMI operation.
1029 * Lousy hardware makes this hard. This is only enabled for systems
1030 * that are not BT and do not have interrupts. It starts spinning
1031 * when an operation is complete or until max_busy tells it to stop
1032 * (if that is enabled). See the paragraph on kimid_max_busy_us in
1033 * Documentation/IPMI.txt for details.
1035 static int ipmi_thread(void *data)
1037 struct smi_info *smi_info = data;
1038 unsigned long flags;
1039 enum si_sm_result smi_result;
1040 struct timespec busy_until;
1042 ipmi_si_set_not_busy(&busy_until);
1043 set_user_nice(current, MAX_NICE);
1044 while (!kthread_should_stop()) {
1047 spin_lock_irqsave(&(smi_info->si_lock), flags);
1048 smi_result = smi_event_handler(smi_info, 0);
1051 * If the driver is doing something, there is a possible
1052 * race with the timer. If the timer handler see idle,
1053 * and the thread here sees something else, the timer
1054 * handler won't restart the timer even though it is
1055 * required. So start it here if necessary.
1057 if (smi_result != SI_SM_IDLE && !smi_info->timer_running)
1058 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
1060 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1061 busy_wait = ipmi_thread_busy_wait(smi_result, smi_info,
1063 if (smi_result == SI_SM_CALL_WITHOUT_DELAY)
1065 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
1067 else if (smi_result == SI_SM_IDLE) {
1068 if (atomic_read(&smi_info->need_watch)) {
1069 schedule_timeout_interruptible(100);
1071 /* Wait to be woken up when we are needed. */
1072 __set_current_state(TASK_INTERRUPTIBLE);
1076 schedule_timeout_interruptible(1);
1082 static void poll(void *send_info)
1084 struct smi_info *smi_info = send_info;
1085 unsigned long flags = 0;
1086 bool run_to_completion = smi_info->run_to_completion;
1089 * Make sure there is some delay in the poll loop so we can
1090 * drive time forward and timeout things.
1093 if (!run_to_completion)
1094 spin_lock_irqsave(&smi_info->si_lock, flags);
1095 smi_event_handler(smi_info, 10);
1096 if (!run_to_completion)
1097 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1100 static void request_events(void *send_info)
1102 struct smi_info *smi_info = send_info;
1104 if (!smi_info->has_event_buffer)
1107 atomic_set(&smi_info->req_events, 1);
1110 static void set_need_watch(void *send_info, bool enable)
1112 struct smi_info *smi_info = send_info;
1113 unsigned long flags;
1115 atomic_set(&smi_info->need_watch, enable);
1116 spin_lock_irqsave(&smi_info->si_lock, flags);
1117 check_start_timer_thread(smi_info);
1118 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1121 static int initialized;
1123 static void smi_timeout(unsigned long data)
1125 struct smi_info *smi_info = (struct smi_info *) data;
1126 enum si_sm_result smi_result;
1127 unsigned long flags;
1128 unsigned long jiffies_now;
1135 spin_lock_irqsave(&(smi_info->si_lock), flags);
1137 do_gettimeofday(&t);
1138 printk(KERN_DEBUG "**Timer: %d.%9.9d\n", t.tv_sec, t.tv_usec);
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;
1180 spin_lock_irqsave(&(smi_info->si_lock), flags);
1182 smi_inc_stat(smi_info, interrupts);
1185 do_gettimeofday(&t);
1186 printk(KERN_DEBUG "**Interrupt: %d.%9.9d\n", t.tv_sec, t.tv_usec);
1188 smi_event_handler(smi_info, 0);
1189 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1193 static irqreturn_t si_bt_irq_handler(int irq, void *data)
1195 struct smi_info *smi_info = data;
1196 /* We need to clear the IRQ flag for the BT interface. */
1197 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
1198 IPMI_BT_INTMASK_CLEAR_IRQ_BIT
1199 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1200 return si_irq_handler(irq, data);
1203 static int smi_start_processing(void *send_info,
1206 struct smi_info *new_smi = send_info;
1209 new_smi->intf = intf;
1211 /* Try to claim any interrupts. */
1212 if (new_smi->irq_setup)
1213 new_smi->irq_setup(new_smi);
1215 /* Set up the timer that drives the interface. */
1216 setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi);
1217 smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES);
1220 * Check if the user forcefully enabled the daemon.
1222 if (new_smi->intf_num < num_force_kipmid)
1223 enable = force_kipmid[new_smi->intf_num];
1225 * The BT interface is efficient enough to not need a thread,
1226 * and there is no need for a thread if we have interrupts.
1228 else if ((new_smi->si_type != SI_BT) && (!new_smi->irq))
1232 new_smi->thread = kthread_run(ipmi_thread, new_smi,
1233 "kipmi%d", new_smi->intf_num);
1234 if (IS_ERR(new_smi->thread)) {
1235 dev_notice(new_smi->dev, "Could not start"
1236 " kernel thread due to error %ld, only using"
1237 " timers to drive the interface\n",
1238 PTR_ERR(new_smi->thread));
1239 new_smi->thread = NULL;
1246 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1248 struct smi_info *smi = send_info;
1250 data->addr_src = smi->addr_source;
1251 data->dev = smi->dev;
1252 data->addr_info = smi->addr_info;
1253 get_device(smi->dev);
1258 static void set_maintenance_mode(void *send_info, bool enable)
1260 struct smi_info *smi_info = send_info;
1263 atomic_set(&smi_info->req_events, 0);
1266 static struct ipmi_smi_handlers handlers = {
1267 .owner = THIS_MODULE,
1268 .start_processing = smi_start_processing,
1269 .get_smi_info = get_smi_info,
1271 .request_events = request_events,
1272 .set_need_watch = set_need_watch,
1273 .set_maintenance_mode = set_maintenance_mode,
1274 .set_run_to_completion = set_run_to_completion,
1279 * There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
1280 * a default IO port, and 1 ACPI/SPMI address. That sets SI_MAX_DRIVERS.
1283 static LIST_HEAD(smi_infos);
1284 static DEFINE_MUTEX(smi_infos_lock);
1285 static int smi_num; /* Used to sequence the SMIs */
1287 #define DEFAULT_REGSPACING 1
1288 #define DEFAULT_REGSIZE 1
1291 static bool si_tryacpi = 1;
1294 static bool si_trydmi = 1;
1296 static bool si_tryplatform = 1;
1298 static bool si_trypci = 1;
1300 static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
1301 static char *si_type[SI_MAX_PARMS];
1302 #define MAX_SI_TYPE_STR 30
1303 static char si_type_str[MAX_SI_TYPE_STR];
1304 static unsigned long addrs[SI_MAX_PARMS];
1305 static unsigned int num_addrs;
1306 static unsigned int ports[SI_MAX_PARMS];
1307 static unsigned int num_ports;
1308 static int irqs[SI_MAX_PARMS];
1309 static unsigned int num_irqs;
1310 static int regspacings[SI_MAX_PARMS];
1311 static unsigned int num_regspacings;
1312 static int regsizes[SI_MAX_PARMS];
1313 static unsigned int num_regsizes;
1314 static int regshifts[SI_MAX_PARMS];
1315 static unsigned int num_regshifts;
1316 static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */
1317 static unsigned int num_slave_addrs;
1319 #define IPMI_IO_ADDR_SPACE 0
1320 #define IPMI_MEM_ADDR_SPACE 1
1321 static char *addr_space_to_str[] = { "i/o", "mem" };
1323 static int hotmod_handler(const char *val, struct kernel_param *kp);
1325 module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
1326 MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
1327 " Documentation/IPMI.txt in the kernel sources for the"
1331 module_param_named(tryacpi, si_tryacpi, bool, 0);
1332 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1333 " default scan of the interfaces identified via ACPI");
1336 module_param_named(trydmi, si_trydmi, bool, 0);
1337 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
1338 " default scan of the interfaces identified via DMI");
1340 module_param_named(tryplatform, si_tryplatform, bool, 0);
1341 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1342 " default scan of the interfaces identified via platform"
1343 " interfaces like openfirmware");
1345 module_param_named(trypci, si_trypci, bool, 0);
1346 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1347 " default scan of the interfaces identified via pci");
1349 module_param_named(trydefaults, si_trydefaults, bool, 0);
1350 MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the"
1351 " default scan of the KCS and SMIC interface at the standard"
1353 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
1354 MODULE_PARM_DESC(type, "Defines the type of each interface, each"
1355 " interface separated by commas. The types are 'kcs',"
1356 " 'smic', and 'bt'. For example si_type=kcs,bt will set"
1357 " the first interface to kcs and the second to bt");
1358 module_param_array(addrs, ulong, &num_addrs, 0);
1359 MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
1360 " addresses separated by commas. Only use if an interface"
1361 " is in memory. Otherwise, set it to zero or leave"
1363 module_param_array(ports, uint, &num_ports, 0);
1364 MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
1365 " addresses separated by commas. Only use if an interface"
1366 " is a port. Otherwise, set it to zero or leave"
1368 module_param_array(irqs, int, &num_irqs, 0);
1369 MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
1370 " addresses separated by commas. Only use if an interface"
1371 " has an interrupt. Otherwise, set it to zero or leave"
1373 module_param_array(regspacings, int, &num_regspacings, 0);
1374 MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
1375 " and each successive register used by the interface. For"
1376 " instance, if the start address is 0xca2 and the spacing"
1377 " is 2, then the second address is at 0xca4. Defaults"
1379 module_param_array(regsizes, int, &num_regsizes, 0);
1380 MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
1381 " This should generally be 1, 2, 4, or 8 for an 8-bit,"
1382 " 16-bit, 32-bit, or 64-bit register. Use this if you"
1383 " the 8-bit IPMI register has to be read from a larger"
1385 module_param_array(regshifts, int, &num_regshifts, 0);
1386 MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
1387 " IPMI register, in bits. For instance, if the data"
1388 " is read from a 32-bit word and the IPMI data is in"
1389 " bit 8-15, then the shift would be 8");
1390 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1391 MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
1392 " the controller. Normally this is 0x20, but can be"
1393 " overridden by this parm. This is an array indexed"
1394 " by interface number.");
1395 module_param_array(force_kipmid, int, &num_force_kipmid, 0);
1396 MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or"
1397 " disabled(0). Normally the IPMI driver auto-detects"
1398 " this, but the value may be overridden by this parm.");
1399 module_param(unload_when_empty, bool, 0);
1400 MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are"
1401 " specified or found, default is 1. Setting to 0"
1402 " is useful for hot add of devices using hotmod.");
1403 module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644);
1404 MODULE_PARM_DESC(kipmid_max_busy_us,
1405 "Max time (in microseconds) to busy-wait for IPMI data before"
1406 " sleeping. 0 (default) means to wait forever. Set to 100-500"
1407 " if kipmid is using up a lot of CPU time.");
1410 static void std_irq_cleanup(struct smi_info *info)
1412 if (info->si_type == SI_BT)
1413 /* Disable the interrupt in the BT interface. */
1414 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0);
1415 free_irq(info->irq, info);
1418 static int std_irq_setup(struct smi_info *info)
1425 if (info->si_type == SI_BT) {
1426 rv = request_irq(info->irq,
1432 /* Enable the interrupt in the BT interface. */
1433 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG,
1434 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1436 rv = request_irq(info->irq,
1442 dev_warn(info->dev, "%s unable to claim interrupt %d,"
1443 " running polled\n",
1444 DEVICE_NAME, info->irq);
1447 info->irq_cleanup = std_irq_cleanup;
1448 dev_info(info->dev, "Using irq %d\n", info->irq);
1454 static unsigned char port_inb(struct si_sm_io *io, unsigned int offset)
1456 unsigned int addr = io->addr_data;
1458 return inb(addr + (offset * io->regspacing));
1461 static void port_outb(struct si_sm_io *io, unsigned int offset,
1464 unsigned int addr = io->addr_data;
1466 outb(b, addr + (offset * io->regspacing));
1469 static unsigned char port_inw(struct si_sm_io *io, unsigned int offset)
1471 unsigned int addr = io->addr_data;
1473 return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1476 static void port_outw(struct si_sm_io *io, unsigned int offset,
1479 unsigned int addr = io->addr_data;
1481 outw(b << io->regshift, addr + (offset * io->regspacing));
1484 static unsigned char port_inl(struct si_sm_io *io, unsigned int offset)
1486 unsigned int addr = io->addr_data;
1488 return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1491 static void port_outl(struct si_sm_io *io, unsigned int offset,
1494 unsigned int addr = io->addr_data;
1496 outl(b << io->regshift, addr+(offset * io->regspacing));
1499 static void port_cleanup(struct smi_info *info)
1501 unsigned int addr = info->io.addr_data;
1505 for (idx = 0; idx < info->io_size; idx++)
1506 release_region(addr + idx * info->io.regspacing,
1511 static int port_setup(struct smi_info *info)
1513 unsigned int addr = info->io.addr_data;
1519 info->io_cleanup = port_cleanup;
1522 * Figure out the actual inb/inw/inl/etc routine to use based
1523 * upon the register size.
1525 switch (info->io.regsize) {
1527 info->io.inputb = port_inb;
1528 info->io.outputb = port_outb;
1531 info->io.inputb = port_inw;
1532 info->io.outputb = port_outw;
1535 info->io.inputb = port_inl;
1536 info->io.outputb = port_outl;
1539 dev_warn(info->dev, "Invalid register size: %d\n",
1545 * Some BIOSes reserve disjoint I/O regions in their ACPI
1546 * tables. This causes problems when trying to register the
1547 * entire I/O region. Therefore we must register each I/O
1550 for (idx = 0; idx < info->io_size; idx++) {
1551 if (request_region(addr + idx * info->io.regspacing,
1552 info->io.regsize, DEVICE_NAME) == NULL) {
1553 /* Undo allocations */
1555 release_region(addr + idx * info->io.regspacing,
1564 static unsigned char intf_mem_inb(struct si_sm_io *io, unsigned int offset)
1566 return readb((io->addr)+(offset * io->regspacing));
1569 static void intf_mem_outb(struct si_sm_io *io, unsigned int offset,
1572 writeb(b, (io->addr)+(offset * io->regspacing));
1575 static unsigned char intf_mem_inw(struct si_sm_io *io, unsigned int offset)
1577 return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)
1581 static void intf_mem_outw(struct si_sm_io *io, unsigned int offset,
1584 writeb(b << io->regshift, (io->addr)+(offset * io->regspacing));
1587 static unsigned char intf_mem_inl(struct si_sm_io *io, unsigned int offset)
1589 return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)
1593 static void intf_mem_outl(struct si_sm_io *io, unsigned int offset,
1596 writel(b << io->regshift, (io->addr)+(offset * io->regspacing));
1600 static unsigned char mem_inq(struct si_sm_io *io, unsigned int offset)
1602 return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)
1606 static void mem_outq(struct si_sm_io *io, unsigned int offset,
1609 writeq(b << io->regshift, (io->addr)+(offset * io->regspacing));
1613 static void mem_cleanup(struct smi_info *info)
1615 unsigned long addr = info->io.addr_data;
1618 if (info->io.addr) {
1619 iounmap(info->io.addr);
1621 mapsize = ((info->io_size * info->io.regspacing)
1622 - (info->io.regspacing - info->io.regsize));
1624 release_mem_region(addr, mapsize);
1628 static int mem_setup(struct smi_info *info)
1630 unsigned long addr = info->io.addr_data;
1636 info->io_cleanup = mem_cleanup;
1639 * Figure out the actual readb/readw/readl/etc routine to use based
1640 * upon the register size.
1642 switch (info->io.regsize) {
1644 info->io.inputb = intf_mem_inb;
1645 info->io.outputb = intf_mem_outb;
1648 info->io.inputb = intf_mem_inw;
1649 info->io.outputb = intf_mem_outw;
1652 info->io.inputb = intf_mem_inl;
1653 info->io.outputb = intf_mem_outl;
1657 info->io.inputb = mem_inq;
1658 info->io.outputb = mem_outq;
1662 dev_warn(info->dev, "Invalid register size: %d\n",
1668 * Calculate the total amount of memory to claim. This is an
1669 * unusual looking calculation, but it avoids claiming any
1670 * more memory than it has to. It will claim everything
1671 * between the first address to the end of the last full
1674 mapsize = ((info->io_size * info->io.regspacing)
1675 - (info->io.regspacing - info->io.regsize));
1677 if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL)
1680 info->io.addr = ioremap(addr, mapsize);
1681 if (info->io.addr == NULL) {
1682 release_mem_region(addr, mapsize);
1689 * Parms come in as <op1>[:op2[:op3...]]. ops are:
1690 * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
1698 enum hotmod_op { HM_ADD, HM_REMOVE };
1699 struct hotmod_vals {
1703 static struct hotmod_vals hotmod_ops[] = {
1705 { "remove", HM_REMOVE },
1708 static struct hotmod_vals hotmod_si[] = {
1710 { "smic", SI_SMIC },
1714 static struct hotmod_vals hotmod_as[] = {
1715 { "mem", IPMI_MEM_ADDR_SPACE },
1716 { "i/o", IPMI_IO_ADDR_SPACE },
1720 static int parse_str(struct hotmod_vals *v, int *val, char *name, char **curr)
1725 s = strchr(*curr, ',');
1727 printk(KERN_WARNING PFX "No hotmod %s given.\n", name);
1732 for (i = 0; v[i].name; i++) {
1733 if (strcmp(*curr, v[i].name) == 0) {
1740 printk(KERN_WARNING PFX "Invalid hotmod %s '%s'\n", name, *curr);
1744 static int check_hotmod_int_op(const char *curr, const char *option,
1745 const char *name, int *val)
1749 if (strcmp(curr, name) == 0) {
1751 printk(KERN_WARNING PFX
1752 "No option given for '%s'\n",
1756 *val = simple_strtoul(option, &n, 0);
1757 if ((*n != '\0') || (*option == '\0')) {
1758 printk(KERN_WARNING PFX
1759 "Bad option given for '%s'\n",
1768 static struct smi_info *smi_info_alloc(void)
1770 struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
1773 spin_lock_init(&info->si_lock);
1777 static int hotmod_handler(const char *val, struct kernel_param *kp)
1779 char *str = kstrdup(val, GFP_KERNEL);
1781 char *next, *curr, *s, *n, *o;
1783 enum si_type si_type;
1793 struct smi_info *info;
1798 /* Kill any trailing spaces, as we can get a "\n" from echo. */
1801 while ((ival >= 0) && isspace(str[ival])) {
1806 for (curr = str; curr; curr = next) {
1811 ipmb = 0; /* Choose the default if not specified */
1813 next = strchr(curr, ':');
1819 rv = parse_str(hotmod_ops, &ival, "operation", &curr);
1824 rv = parse_str(hotmod_si, &ival, "interface type", &curr);
1829 rv = parse_str(hotmod_as, &addr_space, "address space", &curr);
1833 s = strchr(curr, ',');
1838 addr = simple_strtoul(curr, &n, 0);
1839 if ((*n != '\0') || (*curr == '\0')) {
1840 printk(KERN_WARNING PFX "Invalid hotmod address"
1847 s = strchr(curr, ',');
1852 o = strchr(curr, '=');
1857 rv = check_hotmod_int_op(curr, o, "rsp", ®spacing);
1862 rv = check_hotmod_int_op(curr, o, "rsi", ®size);
1867 rv = check_hotmod_int_op(curr, o, "rsh", ®shift);
1872 rv = check_hotmod_int_op(curr, o, "irq", &irq);
1877 rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb);
1884 printk(KERN_WARNING PFX
1885 "Invalid hotmod option '%s'\n",
1891 info = smi_info_alloc();
1897 info->addr_source = SI_HOTMOD;
1898 info->si_type = si_type;
1899 info->io.addr_data = addr;
1900 info->io.addr_type = addr_space;
1901 if (addr_space == IPMI_MEM_ADDR_SPACE)
1902 info->io_setup = mem_setup;
1904 info->io_setup = port_setup;
1906 info->io.addr = NULL;
1907 info->io.regspacing = regspacing;
1908 if (!info->io.regspacing)
1909 info->io.regspacing = DEFAULT_REGSPACING;
1910 info->io.regsize = regsize;
1911 if (!info->io.regsize)
1912 info->io.regsize = DEFAULT_REGSPACING;
1913 info->io.regshift = regshift;
1916 info->irq_setup = std_irq_setup;
1917 info->slave_addr = ipmb;
1924 rv = try_smi_init(info);
1926 cleanup_one_si(info);
1931 struct smi_info *e, *tmp_e;
1933 mutex_lock(&smi_infos_lock);
1934 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) {
1935 if (e->io.addr_type != addr_space)
1937 if (e->si_type != si_type)
1939 if (e->io.addr_data == addr)
1942 mutex_unlock(&smi_infos_lock);
1951 static int hardcode_find_bmc(void)
1955 struct smi_info *info;
1957 for (i = 0; i < SI_MAX_PARMS; i++) {
1958 if (!ports[i] && !addrs[i])
1961 info = smi_info_alloc();
1965 info->addr_source = SI_HARDCODED;
1966 printk(KERN_INFO PFX "probing via hardcoded address\n");
1968 if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) {
1969 info->si_type = SI_KCS;
1970 } else if (strcmp(si_type[i], "smic") == 0) {
1971 info->si_type = SI_SMIC;
1972 } else if (strcmp(si_type[i], "bt") == 0) {
1973 info->si_type = SI_BT;
1975 printk(KERN_WARNING PFX "Interface type specified "
1976 "for interface %d, was invalid: %s\n",
1984 info->io_setup = port_setup;
1985 info->io.addr_data = ports[i];
1986 info->io.addr_type = IPMI_IO_ADDR_SPACE;
1987 } else if (addrs[i]) {
1989 info->io_setup = mem_setup;
1990 info->io.addr_data = addrs[i];
1991 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
1993 printk(KERN_WARNING PFX "Interface type specified "
1994 "for interface %d, but port and address were "
1995 "not set or set to zero.\n", i);
2000 info->io.addr = NULL;
2001 info->io.regspacing = regspacings[i];
2002 if (!info->io.regspacing)
2003 info->io.regspacing = DEFAULT_REGSPACING;
2004 info->io.regsize = regsizes[i];
2005 if (!info->io.regsize)
2006 info->io.regsize = DEFAULT_REGSPACING;
2007 info->io.regshift = regshifts[i];
2008 info->irq = irqs[i];
2010 info->irq_setup = std_irq_setup;
2011 info->slave_addr = slave_addrs[i];
2013 if (!add_smi(info)) {
2014 if (try_smi_init(info))
2015 cleanup_one_si(info);
2026 #include <linux/acpi.h>
2029 * Once we get an ACPI failure, we don't try any more, because we go
2030 * through the tables sequentially. Once we don't find a table, there
2033 static int acpi_failure;
2035 /* For GPE-type interrupts. */
2036 static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
2037 u32 gpe_number, void *context)
2039 struct smi_info *smi_info = context;
2040 unsigned long flags;
2045 spin_lock_irqsave(&(smi_info->si_lock), flags);
2047 smi_inc_stat(smi_info, interrupts);
2050 do_gettimeofday(&t);
2051 printk("**ACPI_GPE: %d.%9.9d\n", t.tv_sec, t.tv_usec);
2053 smi_event_handler(smi_info, 0);
2054 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
2056 return ACPI_INTERRUPT_HANDLED;
2059 static void acpi_gpe_irq_cleanup(struct smi_info *info)
2064 acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe);
2067 static int acpi_gpe_irq_setup(struct smi_info *info)
2074 status = acpi_install_gpe_handler(NULL,
2076 ACPI_GPE_LEVEL_TRIGGERED,
2079 if (status != AE_OK) {
2080 dev_warn(info->dev, "%s unable to claim ACPI GPE %d,"
2081 " running polled\n", DEVICE_NAME, info->irq);
2085 info->irq_cleanup = acpi_gpe_irq_cleanup;
2086 dev_info(info->dev, "Using ACPI GPE %d\n", info->irq);
2093 * http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf
2104 s8 CreatorRevision[4];
2107 s16 SpecificationRevision;
2110 * Bit 0 - SCI interrupt supported
2111 * Bit 1 - I/O APIC/SAPIC
2116 * If bit 0 of InterruptType is set, then this is the SCI
2117 * interrupt in the GPEx_STS register.
2124 * If bit 1 of InterruptType is set, then this is the I/O
2125 * APIC/SAPIC interrupt.
2127 u32 GlobalSystemInterrupt;
2129 /* The actual register address. */
2130 struct acpi_generic_address addr;
2134 s8 spmi_id[1]; /* A '\0' terminated array starts here. */
2137 static int try_init_spmi(struct SPMITable *spmi)
2139 struct smi_info *info;
2142 if (spmi->IPMIlegacy != 1) {
2143 printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy);
2147 info = smi_info_alloc();
2149 printk(KERN_ERR PFX "Could not allocate SI data (3)\n");
2153 info->addr_source = SI_SPMI;
2154 printk(KERN_INFO PFX "probing via SPMI\n");
2156 /* Figure out the interface type. */
2157 switch (spmi->InterfaceType) {
2159 info->si_type = SI_KCS;
2162 info->si_type = SI_SMIC;
2165 info->si_type = SI_BT;
2167 case 4: /* SSIF, just ignore */
2171 printk(KERN_INFO PFX "Unknown ACPI/SPMI SI type %d\n",
2172 spmi->InterfaceType);
2177 if (spmi->InterruptType & 1) {
2178 /* We've got a GPE interrupt. */
2179 info->irq = spmi->GPE;
2180 info->irq_setup = acpi_gpe_irq_setup;
2181 } else if (spmi->InterruptType & 2) {
2182 /* We've got an APIC/SAPIC interrupt. */
2183 info->irq = spmi->GlobalSystemInterrupt;
2184 info->irq_setup = std_irq_setup;
2186 /* Use the default interrupt setting. */
2188 info->irq_setup = NULL;
2191 if (spmi->addr.bit_width) {
2192 /* A (hopefully) properly formed register bit width. */
2193 info->io.regspacing = spmi->addr.bit_width / 8;
2195 info->io.regspacing = DEFAULT_REGSPACING;
2197 info->io.regsize = info->io.regspacing;
2198 info->io.regshift = spmi->addr.bit_offset;
2200 if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
2201 info->io_setup = mem_setup;
2202 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2203 } else if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
2204 info->io_setup = port_setup;
2205 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2208 printk(KERN_WARNING PFX "Unknown ACPI I/O Address type\n");
2211 info->io.addr_data = spmi->addr.address;
2213 pr_info("ipmi_si: SPMI: %s %#lx regsize %d spacing %d irq %d\n",
2214 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2215 info->io.addr_data, info->io.regsize, info->io.regspacing,
2225 static void spmi_find_bmc(void)
2228 struct SPMITable *spmi;
2237 for (i = 0; ; i++) {
2238 status = acpi_get_table(ACPI_SIG_SPMI, i+1,
2239 (struct acpi_table_header **)&spmi);
2240 if (status != AE_OK)
2243 try_init_spmi(spmi);
2247 static int ipmi_pnp_probe(struct pnp_dev *dev,
2248 const struct pnp_device_id *dev_id)
2250 struct acpi_device *acpi_dev;
2251 struct smi_info *info;
2252 struct resource *res, *res_second;
2255 unsigned long long tmp;
2258 acpi_dev = pnp_acpi_device(dev);
2262 info = smi_info_alloc();
2266 info->addr_source = SI_ACPI;
2267 printk(KERN_INFO PFX "probing via ACPI\n");
2269 handle = acpi_dev->handle;
2270 info->addr_info.acpi_info.acpi_handle = handle;
2272 /* _IFT tells us the interface type: KCS, BT, etc */
2273 status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
2274 if (ACPI_FAILURE(status))
2279 info->si_type = SI_KCS;
2282 info->si_type = SI_SMIC;
2285 info->si_type = SI_BT;
2287 case 4: /* SSIF, just ignore */
2290 dev_info(&dev->dev, "unknown IPMI type %lld\n", tmp);
2294 res = pnp_get_resource(dev, IORESOURCE_IO, 0);
2296 info->io_setup = port_setup;
2297 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2299 res = pnp_get_resource(dev, IORESOURCE_MEM, 0);
2301 info->io_setup = mem_setup;
2302 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2306 dev_err(&dev->dev, "no I/O or memory address\n");
2309 info->io.addr_data = res->start;
2311 info->io.regspacing = DEFAULT_REGSPACING;
2312 res_second = pnp_get_resource(dev,
2313 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ?
2314 IORESOURCE_IO : IORESOURCE_MEM,
2317 if (res_second->start > info->io.addr_data)
2318 info->io.regspacing = res_second->start - info->io.addr_data;
2320 info->io.regsize = DEFAULT_REGSPACING;
2321 info->io.regshift = 0;
2323 /* If _GPE exists, use it; otherwise use standard interrupts */
2324 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
2325 if (ACPI_SUCCESS(status)) {
2327 info->irq_setup = acpi_gpe_irq_setup;
2328 } else if (pnp_irq_valid(dev, 0)) {
2329 info->irq = pnp_irq(dev, 0);
2330 info->irq_setup = std_irq_setup;
2333 info->dev = &dev->dev;
2334 pnp_set_drvdata(dev, info);
2336 dev_info(info->dev, "%pR regsize %d spacing %d irq %d\n",
2337 res, info->io.regsize, info->io.regspacing,
2351 static void ipmi_pnp_remove(struct pnp_dev *dev)
2353 struct smi_info *info = pnp_get_drvdata(dev);
2355 cleanup_one_si(info);
2358 static const struct pnp_device_id pnp_dev_table[] = {
2363 static struct pnp_driver ipmi_pnp_driver = {
2364 .name = DEVICE_NAME,
2365 .probe = ipmi_pnp_probe,
2366 .remove = ipmi_pnp_remove,
2367 .id_table = pnp_dev_table,
2370 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
2374 struct dmi_ipmi_data {
2377 unsigned long base_addr;
2383 static int decode_dmi(const struct dmi_header *dm,
2384 struct dmi_ipmi_data *dmi)
2386 const u8 *data = (const u8 *)dm;
2387 unsigned long base_addr;
2389 u8 len = dm->length;
2391 dmi->type = data[4];
2393 memcpy(&base_addr, data+8, sizeof(unsigned long));
2395 if (base_addr & 1) {
2397 base_addr &= 0xFFFE;
2398 dmi->addr_space = IPMI_IO_ADDR_SPACE;
2401 dmi->addr_space = IPMI_MEM_ADDR_SPACE;
2403 /* If bit 4 of byte 0x10 is set, then the lsb for the address
2405 dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
2407 dmi->irq = data[0x11];
2409 /* The top two bits of byte 0x10 hold the register spacing. */
2410 reg_spacing = (data[0x10] & 0xC0) >> 6;
2411 switch (reg_spacing) {
2412 case 0x00: /* Byte boundaries */
2415 case 0x01: /* 32-bit boundaries */
2418 case 0x02: /* 16-byte boundaries */
2422 /* Some other interface, just ignore it. */
2428 * Note that technically, the lower bit of the base
2429 * address should be 1 if the address is I/O and 0 if
2430 * the address is in memory. So many systems get that
2431 * wrong (and all that I have seen are I/O) so we just
2432 * ignore that bit and assume I/O. Systems that use
2433 * memory should use the newer spec, anyway.
2435 dmi->base_addr = base_addr & 0xfffe;
2436 dmi->addr_space = IPMI_IO_ADDR_SPACE;
2440 dmi->slave_addr = data[6];
2445 static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
2447 struct smi_info *info;
2449 info = smi_info_alloc();
2451 printk(KERN_ERR PFX "Could not allocate SI data\n");
2455 info->addr_source = SI_SMBIOS;
2456 printk(KERN_INFO PFX "probing via SMBIOS\n");
2458 switch (ipmi_data->type) {
2459 case 0x01: /* KCS */
2460 info->si_type = SI_KCS;
2462 case 0x02: /* SMIC */
2463 info->si_type = SI_SMIC;
2466 info->si_type = SI_BT;
2473 switch (ipmi_data->addr_space) {
2474 case IPMI_MEM_ADDR_SPACE:
2475 info->io_setup = mem_setup;
2476 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2479 case IPMI_IO_ADDR_SPACE:
2480 info->io_setup = port_setup;
2481 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2486 printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n",
2487 ipmi_data->addr_space);
2490 info->io.addr_data = ipmi_data->base_addr;
2492 info->io.regspacing = ipmi_data->offset;
2493 if (!info->io.regspacing)
2494 info->io.regspacing = DEFAULT_REGSPACING;
2495 info->io.regsize = DEFAULT_REGSPACING;
2496 info->io.regshift = 0;
2498 info->slave_addr = ipmi_data->slave_addr;
2500 info->irq = ipmi_data->irq;
2502 info->irq_setup = std_irq_setup;
2504 pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n",
2505 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2506 info->io.addr_data, info->io.regsize, info->io.regspacing,
2513 static void dmi_find_bmc(void)
2515 const struct dmi_device *dev = NULL;
2516 struct dmi_ipmi_data data;
2519 while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) {
2520 memset(&data, 0, sizeof(data));
2521 rv = decode_dmi((const struct dmi_header *) dev->device_data,
2524 try_init_dmi(&data);
2527 #endif /* CONFIG_DMI */
2531 #define PCI_ERMC_CLASSCODE 0x0C0700
2532 #define PCI_ERMC_CLASSCODE_MASK 0xffffff00
2533 #define PCI_ERMC_CLASSCODE_TYPE_MASK 0xff
2534 #define PCI_ERMC_CLASSCODE_TYPE_SMIC 0x00
2535 #define PCI_ERMC_CLASSCODE_TYPE_KCS 0x01
2536 #define PCI_ERMC_CLASSCODE_TYPE_BT 0x02
2538 #define PCI_HP_VENDOR_ID 0x103C
2539 #define PCI_MMC_DEVICE_ID 0x121A
2540 #define PCI_MMC_ADDR_CW 0x10
2542 static void ipmi_pci_cleanup(struct smi_info *info)
2544 struct pci_dev *pdev = info->addr_source_data;
2546 pci_disable_device(pdev);
2549 static int ipmi_pci_probe_regspacing(struct smi_info *info)
2551 if (info->si_type == SI_KCS) {
2552 unsigned char status;
2555 info->io.regsize = DEFAULT_REGSIZE;
2556 info->io.regshift = 0;
2558 info->handlers = &kcs_smi_handlers;
2560 /* detect 1, 4, 16byte spacing */
2561 for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
2562 info->io.regspacing = regspacing;
2563 if (info->io_setup(info)) {
2565 "Could not setup I/O space\n");
2566 return DEFAULT_REGSPACING;
2568 /* write invalid cmd */
2569 info->io.outputb(&info->io, 1, 0x10);
2570 /* read status back */
2571 status = info->io.inputb(&info->io, 1);
2572 info->io_cleanup(info);
2578 return DEFAULT_REGSPACING;
2581 static int ipmi_pci_probe(struct pci_dev *pdev,
2582 const struct pci_device_id *ent)
2585 int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
2586 struct smi_info *info;
2588 info = smi_info_alloc();
2592 info->addr_source = SI_PCI;
2593 dev_info(&pdev->dev, "probing via PCI");
2595 switch (class_type) {
2596 case PCI_ERMC_CLASSCODE_TYPE_SMIC:
2597 info->si_type = SI_SMIC;
2600 case PCI_ERMC_CLASSCODE_TYPE_KCS:
2601 info->si_type = SI_KCS;
2604 case PCI_ERMC_CLASSCODE_TYPE_BT:
2605 info->si_type = SI_BT;
2610 dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type);
2614 rv = pci_enable_device(pdev);
2616 dev_err(&pdev->dev, "couldn't enable PCI device\n");
2621 info->addr_source_cleanup = ipmi_pci_cleanup;
2622 info->addr_source_data = pdev;
2624 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
2625 info->io_setup = port_setup;
2626 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2628 info->io_setup = mem_setup;
2629 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2631 info->io.addr_data = pci_resource_start(pdev, 0);
2633 info->io.regspacing = ipmi_pci_probe_regspacing(info);
2634 info->io.regsize = DEFAULT_REGSIZE;
2635 info->io.regshift = 0;
2637 info->irq = pdev->irq;
2639 info->irq_setup = std_irq_setup;
2641 info->dev = &pdev->dev;
2642 pci_set_drvdata(pdev, info);
2644 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
2645 &pdev->resource[0], info->io.regsize, info->io.regspacing,
2651 pci_disable_device(pdev);
2657 static void ipmi_pci_remove(struct pci_dev *pdev)
2659 struct smi_info *info = pci_get_drvdata(pdev);
2660 cleanup_one_si(info);
2661 pci_disable_device(pdev);
2664 static struct pci_device_id ipmi_pci_devices[] = {
2665 { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) },
2666 { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) },
2669 MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);
2671 static struct pci_driver ipmi_pci_driver = {
2672 .name = DEVICE_NAME,
2673 .id_table = ipmi_pci_devices,
2674 .probe = ipmi_pci_probe,
2675 .remove = ipmi_pci_remove,
2677 #endif /* CONFIG_PCI */
2679 static struct of_device_id ipmi_match[];
2680 static int ipmi_probe(struct platform_device *dev)
2683 const struct of_device_id *match;
2684 struct smi_info *info;
2685 struct resource resource;
2686 const __be32 *regsize, *regspacing, *regshift;
2687 struct device_node *np = dev->dev.of_node;
2691 dev_info(&dev->dev, "probing via device tree\n");
2693 match = of_match_device(ipmi_match, &dev->dev);
2697 if (!of_device_is_available(np))
2700 ret = of_address_to_resource(np, 0, &resource);
2702 dev_warn(&dev->dev, PFX "invalid address from OF\n");
2706 regsize = of_get_property(np, "reg-size", &proplen);
2707 if (regsize && proplen != 4) {
2708 dev_warn(&dev->dev, PFX "invalid regsize from OF\n");
2712 regspacing = of_get_property(np, "reg-spacing", &proplen);
2713 if (regspacing && proplen != 4) {
2714 dev_warn(&dev->dev, PFX "invalid regspacing from OF\n");
2718 regshift = of_get_property(np, "reg-shift", &proplen);
2719 if (regshift && proplen != 4) {
2720 dev_warn(&dev->dev, PFX "invalid regshift from OF\n");
2724 info = smi_info_alloc();
2728 "could not allocate memory for OF probe\n");
2732 info->si_type = (enum si_type) match->data;
2733 info->addr_source = SI_DEVICETREE;
2734 info->irq_setup = std_irq_setup;
2736 if (resource.flags & IORESOURCE_IO) {
2737 info->io_setup = port_setup;
2738 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2740 info->io_setup = mem_setup;
2741 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2744 info->io.addr_data = resource.start;
2746 info->io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
2747 info->io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
2748 info->io.regshift = regshift ? be32_to_cpup(regshift) : 0;
2750 info->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
2751 info->dev = &dev->dev;
2753 dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
2754 info->io.addr_data, info->io.regsize, info->io.regspacing,
2757 dev_set_drvdata(&dev->dev, info);
2759 ret = add_smi(info);
2768 static int ipmi_remove(struct platform_device *dev)
2771 cleanup_one_si(dev_get_drvdata(&dev->dev));
2776 static struct of_device_id ipmi_match[] =
2778 { .type = "ipmi", .compatible = "ipmi-kcs",
2779 .data = (void *)(unsigned long) SI_KCS },
2780 { .type = "ipmi", .compatible = "ipmi-smic",
2781 .data = (void *)(unsigned long) SI_SMIC },
2782 { .type = "ipmi", .compatible = "ipmi-bt",
2783 .data = (void *)(unsigned long) SI_BT },
2787 static struct platform_driver ipmi_driver = {
2789 .name = DEVICE_NAME,
2790 .of_match_table = ipmi_match,
2792 .probe = ipmi_probe,
2793 .remove = ipmi_remove,
2796 #ifdef CONFIG_PARISC
2797 static int ipmi_parisc_probe(struct parisc_device *dev)
2799 struct smi_info *info;
2802 info = smi_info_alloc();
2806 "could not allocate memory for PARISC probe\n");
2810 info->si_type = SI_KCS;
2811 info->addr_source = SI_DEVICETREE;
2812 info->io_setup = mem_setup;
2813 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2814 info->io.addr_data = dev->hpa.start;
2815 info->io.regsize = 1;
2816 info->io.regspacing = 1;
2817 info->io.regshift = 0;
2818 info->irq = 0; /* no interrupt */
2819 info->irq_setup = NULL;
2820 info->dev = &dev->dev;
2822 dev_dbg(&dev->dev, "addr 0x%lx\n", info->io.addr_data);
2824 dev_set_drvdata(&dev->dev, info);
2835 static int ipmi_parisc_remove(struct parisc_device *dev)
2837 cleanup_one_si(dev_get_drvdata(&dev->dev));
2841 static struct parisc_device_id ipmi_parisc_tbl[] = {
2842 { HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 },
2846 static struct parisc_driver ipmi_parisc_driver = {
2848 .id_table = ipmi_parisc_tbl,
2849 .probe = ipmi_parisc_probe,
2850 .remove = ipmi_parisc_remove,
2852 #endif /* CONFIG_PARISC */
2854 static int wait_for_msg_done(struct smi_info *smi_info)
2856 enum si_sm_result smi_result;
2858 smi_result = smi_info->handlers->event(smi_info->si_sm, 0);
2860 if (smi_result == SI_SM_CALL_WITH_DELAY ||
2861 smi_result == SI_SM_CALL_WITH_TICK_DELAY) {
2862 schedule_timeout_uninterruptible(1);
2863 smi_result = smi_info->handlers->event(
2864 smi_info->si_sm, jiffies_to_usecs(1));
2865 } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) {
2866 smi_result = smi_info->handlers->event(
2867 smi_info->si_sm, 0);
2871 if (smi_result == SI_SM_HOSED)
2873 * We couldn't get the state machine to run, so whatever's at
2874 * the port is probably not an IPMI SMI interface.
2881 static int try_get_dev_id(struct smi_info *smi_info)
2883 unsigned char msg[2];
2884 unsigned char *resp;
2885 unsigned long resp_len;
2888 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2893 * Do a Get Device ID command, since it comes back with some
2896 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2897 msg[1] = IPMI_GET_DEVICE_ID_CMD;
2898 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2900 rv = wait_for_msg_done(smi_info);
2904 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2905 resp, IPMI_MAX_MSG_LENGTH);
2907 /* Check and record info from the get device id, in case we need it. */
2908 rv = ipmi_demangle_device_id(resp, resp_len, &smi_info->device_id);
2915 static int try_enable_event_buffer(struct smi_info *smi_info)
2917 unsigned char msg[3];
2918 unsigned char *resp;
2919 unsigned long resp_len;
2922 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2926 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2927 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
2928 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2930 rv = wait_for_msg_done(smi_info);
2932 printk(KERN_WARNING PFX "Error getting response from get"
2933 " global enables command, the event buffer is not"
2938 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2939 resp, IPMI_MAX_MSG_LENGTH);
2942 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2943 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
2945 printk(KERN_WARNING PFX "Invalid return from get global"
2946 " enables command, cannot enable the event buffer.\n");
2951 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
2952 /* buffer is already enabled, nothing to do. */
2953 smi_info->supports_event_msg_buff = true;
2957 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2958 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
2959 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF;
2960 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
2962 rv = wait_for_msg_done(smi_info);
2964 printk(KERN_WARNING PFX "Error getting response from set"
2965 " global, enables command, the event buffer is not"
2970 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2971 resp, IPMI_MAX_MSG_LENGTH);
2974 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2975 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
2976 printk(KERN_WARNING PFX "Invalid return from get global,"
2977 "enables command, not enable the event buffer.\n");
2984 * An error when setting the event buffer bit means
2985 * that the event buffer is not supported.
2989 smi_info->supports_event_msg_buff = true;
2996 static int smi_type_proc_show(struct seq_file *m, void *v)
2998 struct smi_info *smi = m->private;
3000 return seq_printf(m, "%s\n", si_to_str[smi->si_type]);
3003 static int smi_type_proc_open(struct inode *inode, struct file *file)
3005 return single_open(file, smi_type_proc_show, PDE_DATA(inode));
3008 static const struct file_operations smi_type_proc_ops = {
3009 .open = smi_type_proc_open,
3011 .llseek = seq_lseek,
3012 .release = single_release,
3015 static int smi_si_stats_proc_show(struct seq_file *m, void *v)
3017 struct smi_info *smi = m->private;
3019 seq_printf(m, "interrupts_enabled: %d\n",
3020 smi->irq && !smi->interrupt_disabled);
3021 seq_printf(m, "short_timeouts: %u\n",
3022 smi_get_stat(smi, short_timeouts));
3023 seq_printf(m, "long_timeouts: %u\n",
3024 smi_get_stat(smi, long_timeouts));
3025 seq_printf(m, "idles: %u\n",
3026 smi_get_stat(smi, idles));
3027 seq_printf(m, "interrupts: %u\n",
3028 smi_get_stat(smi, interrupts));
3029 seq_printf(m, "attentions: %u\n",
3030 smi_get_stat(smi, attentions));
3031 seq_printf(m, "flag_fetches: %u\n",
3032 smi_get_stat(smi, flag_fetches));
3033 seq_printf(m, "hosed_count: %u\n",
3034 smi_get_stat(smi, hosed_count));
3035 seq_printf(m, "complete_transactions: %u\n",
3036 smi_get_stat(smi, complete_transactions));
3037 seq_printf(m, "events: %u\n",
3038 smi_get_stat(smi, events));
3039 seq_printf(m, "watchdog_pretimeouts: %u\n",
3040 smi_get_stat(smi, watchdog_pretimeouts));
3041 seq_printf(m, "incoming_messages: %u\n",
3042 smi_get_stat(smi, incoming_messages));
3046 static int smi_si_stats_proc_open(struct inode *inode, struct file *file)
3048 return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode));
3051 static const struct file_operations smi_si_stats_proc_ops = {
3052 .open = smi_si_stats_proc_open,
3054 .llseek = seq_lseek,
3055 .release = single_release,
3058 static int smi_params_proc_show(struct seq_file *m, void *v)
3060 struct smi_info *smi = m->private;
3062 return seq_printf(m,
3063 "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n",
3064 si_to_str[smi->si_type],
3065 addr_space_to_str[smi->io.addr_type],
3074 static int smi_params_proc_open(struct inode *inode, struct file *file)
3076 return single_open(file, smi_params_proc_show, PDE_DATA(inode));
3079 static const struct file_operations smi_params_proc_ops = {
3080 .open = smi_params_proc_open,
3082 .llseek = seq_lseek,
3083 .release = single_release,
3087 * oem_data_avail_to_receive_msg_avail
3088 * @info - smi_info structure with msg_flags set
3090 * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL
3091 * Returns 1 indicating need to re-run handle_flags().
3093 static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info)
3095 smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) |
3101 * setup_dell_poweredge_oem_data_handler
3102 * @info - smi_info.device_id must be populated
3104 * Systems that match, but have firmware version < 1.40 may assert
3105 * OEM0_DATA_AVAIL on their own, without being told via Set Flags that
3106 * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL
3107 * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags
3108 * as RECEIVE_MSG_AVAIL instead.
3110 * As Dell has no plans to release IPMI 1.5 firmware that *ever*
3111 * assert the OEM[012] bits, and if it did, the driver would have to
3112 * change to handle that properly, we don't actually check for the
3114 * Device ID = 0x20 BMC on PowerEdge 8G servers
3115 * Device Revision = 0x80
3116 * Firmware Revision1 = 0x01 BMC version 1.40
3117 * Firmware Revision2 = 0x40 BCD encoded
3118 * IPMI Version = 0x51 IPMI 1.5
3119 * Manufacturer ID = A2 02 00 Dell IANA
3121 * Additionally, PowerEdge systems with IPMI < 1.5 may also assert
3122 * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL.
3125 #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20
3126 #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80
3127 #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51
3128 #define DELL_IANA_MFR_ID 0x0002a2
3129 static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info)
3131 struct ipmi_device_id *id = &smi_info->device_id;
3132 if (id->manufacturer_id == DELL_IANA_MFR_ID) {
3133 if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID &&
3134 id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV &&
3135 id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) {
3136 smi_info->oem_data_avail_handler =
3137 oem_data_avail_to_receive_msg_avail;
3138 } else if (ipmi_version_major(id) < 1 ||
3139 (ipmi_version_major(id) == 1 &&
3140 ipmi_version_minor(id) < 5)) {
3141 smi_info->oem_data_avail_handler =
3142 oem_data_avail_to_receive_msg_avail;
3147 #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA
3148 static void return_hosed_msg_badsize(struct smi_info *smi_info)
3150 struct ipmi_smi_msg *msg = smi_info->curr_msg;
3152 /* Make it a response */
3153 msg->rsp[0] = msg->data[0] | 4;
3154 msg->rsp[1] = msg->data[1];
3155 msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH;
3157 smi_info->curr_msg = NULL;
3158 deliver_recv_msg(smi_info, msg);
3162 * dell_poweredge_bt_xaction_handler
3163 * @info - smi_info.device_id must be populated
3165 * Dell PowerEdge servers with the BT interface (x6xx and 1750) will
3166 * not respond to a Get SDR command if the length of the data
3167 * requested is exactly 0x3A, which leads to command timeouts and no
3168 * data returned. This intercepts such commands, and causes userspace
3169 * callers to try again with a different-sized buffer, which succeeds.
3172 #define STORAGE_NETFN 0x0A
3173 #define STORAGE_CMD_GET_SDR 0x23
3174 static int dell_poweredge_bt_xaction_handler(struct notifier_block *self,
3175 unsigned long unused,
3178 struct smi_info *smi_info = in;
3179 unsigned char *data = smi_info->curr_msg->data;
3180 unsigned int size = smi_info->curr_msg->data_size;
3182 (data[0]>>2) == STORAGE_NETFN &&
3183 data[1] == STORAGE_CMD_GET_SDR &&
3185 return_hosed_msg_badsize(smi_info);
3191 static struct notifier_block dell_poweredge_bt_xaction_notifier = {
3192 .notifier_call = dell_poweredge_bt_xaction_handler,
3196 * setup_dell_poweredge_bt_xaction_handler
3197 * @info - smi_info.device_id must be filled in already
3199 * Fills in smi_info.device_id.start_transaction_pre_hook
3200 * when we know what function to use there.
3203 setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info)
3205 struct ipmi_device_id *id = &smi_info->device_id;
3206 if (id->manufacturer_id == DELL_IANA_MFR_ID &&
3207 smi_info->si_type == SI_BT)
3208 register_xaction_notifier(&dell_poweredge_bt_xaction_notifier);
3212 * setup_oem_data_handler
3213 * @info - smi_info.device_id must be filled in already
3215 * Fills in smi_info.device_id.oem_data_available_handler
3216 * when we know what function to use there.
3219 static void setup_oem_data_handler(struct smi_info *smi_info)
3221 setup_dell_poweredge_oem_data_handler(smi_info);
3224 static void setup_xaction_handlers(struct smi_info *smi_info)
3226 setup_dell_poweredge_bt_xaction_handler(smi_info);
3229 static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
3231 if (smi_info->thread != NULL)
3232 kthread_stop(smi_info->thread);
3233 if (smi_info->timer_running)
3234 del_timer_sync(&smi_info->si_timer);
3237 static struct ipmi_default_vals
3243 { .type = SI_KCS, .port = 0xca2 },
3244 { .type = SI_SMIC, .port = 0xca9 },
3245 { .type = SI_BT, .port = 0xe4 },
3249 static void default_find_bmc(void)
3251 struct smi_info *info;
3254 for (i = 0; ; i++) {
3255 if (!ipmi_defaults[i].port)
3258 if (check_legacy_ioport(ipmi_defaults[i].port))
3261 info = smi_info_alloc();
3265 info->addr_source = SI_DEFAULT;
3267 info->si_type = ipmi_defaults[i].type;
3268 info->io_setup = port_setup;
3269 info->io.addr_data = ipmi_defaults[i].port;
3270 info->io.addr_type = IPMI_IO_ADDR_SPACE;
3272 info->io.addr = NULL;
3273 info->io.regspacing = DEFAULT_REGSPACING;
3274 info->io.regsize = DEFAULT_REGSPACING;
3275 info->io.regshift = 0;
3277 if (add_smi(info) == 0) {
3278 if ((try_smi_init(info)) == 0) {
3280 printk(KERN_INFO PFX "Found default %s"
3281 " state machine at %s address 0x%lx\n",
3282 si_to_str[info->si_type],
3283 addr_space_to_str[info->io.addr_type],
3284 info->io.addr_data);
3286 cleanup_one_si(info);
3293 static int is_new_interface(struct smi_info *info)
3297 list_for_each_entry(e, &smi_infos, link) {
3298 if (e->io.addr_type != info->io.addr_type)
3300 if (e->io.addr_data == info->io.addr_data)
3307 static int add_smi(struct smi_info *new_smi)
3311 printk(KERN_INFO PFX "Adding %s-specified %s state machine",
3312 ipmi_addr_src_to_str(new_smi->addr_source),
3313 si_to_str[new_smi->si_type]);
3314 mutex_lock(&smi_infos_lock);
3315 if (!is_new_interface(new_smi)) {
3316 printk(KERN_CONT " duplicate interface\n");
3321 printk(KERN_CONT "\n");
3323 /* So we know not to free it unless we have allocated one. */
3324 new_smi->intf = NULL;
3325 new_smi->si_sm = NULL;
3326 new_smi->handlers = NULL;
3328 list_add_tail(&new_smi->link, &smi_infos);
3331 mutex_unlock(&smi_infos_lock);
3335 static int try_smi_init(struct smi_info *new_smi)
3340 printk(KERN_INFO PFX "Trying %s-specified %s state"
3341 " machine at %s address 0x%lx, slave address 0x%x,"
3343 ipmi_addr_src_to_str(new_smi->addr_source),
3344 si_to_str[new_smi->si_type],
3345 addr_space_to_str[new_smi->io.addr_type],
3346 new_smi->io.addr_data,
3347 new_smi->slave_addr, new_smi->irq);
3349 switch (new_smi->si_type) {
3351 new_smi->handlers = &kcs_smi_handlers;
3355 new_smi->handlers = &smic_smi_handlers;
3359 new_smi->handlers = &bt_smi_handlers;
3363 /* No support for anything else yet. */
3368 /* Allocate the state machine's data and initialize it. */
3369 new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL);
3370 if (!new_smi->si_sm) {
3372 "Could not allocate state machine memory\n");
3376 new_smi->io_size = new_smi->handlers->init_data(new_smi->si_sm,
3379 /* Now that we know the I/O size, we can set up the I/O. */
3380 rv = new_smi->io_setup(new_smi);
3382 printk(KERN_ERR PFX "Could not set up I/O space\n");
3386 /* Do low-level detection first. */
3387 if (new_smi->handlers->detect(new_smi->si_sm)) {
3388 if (new_smi->addr_source)
3389 printk(KERN_INFO PFX "Interface detection failed\n");
3395 * Attempt a get device id command. If it fails, we probably
3396 * don't have a BMC here.
3398 rv = try_get_dev_id(new_smi);
3400 if (new_smi->addr_source)
3401 printk(KERN_INFO PFX "There appears to be no BMC"
3402 " at this location\n");
3406 setup_oem_data_handler(new_smi);
3407 setup_xaction_handlers(new_smi);
3409 new_smi->waiting_msg = NULL;
3410 new_smi->curr_msg = NULL;
3411 atomic_set(&new_smi->req_events, 0);
3412 new_smi->run_to_completion = false;
3413 for (i = 0; i < SI_NUM_STATS; i++)
3414 atomic_set(&new_smi->stats[i], 0);
3416 new_smi->interrupt_disabled = true;
3417 atomic_set(&new_smi->need_watch, 0);
3418 new_smi->intf_num = smi_num;
3421 rv = try_enable_event_buffer(new_smi);
3423 new_smi->has_event_buffer = true;
3426 * Start clearing the flags before we enable interrupts or the
3427 * timer to avoid racing with the timer.
3429 start_clear_flags(new_smi);
3432 * IRQ is defined to be set when non-zero. req_events will
3433 * cause a global flags check that will enable interrupts.
3436 new_smi->interrupt_disabled = false;
3437 atomic_set(&new_smi->req_events, 1);
3440 if (!new_smi->dev) {
3442 * If we don't already have a device from something
3443 * else (like PCI), then register a new one.
3445 new_smi->pdev = platform_device_alloc("ipmi_si",
3447 if (!new_smi->pdev) {
3449 "Unable to allocate platform device\n");
3452 new_smi->dev = &new_smi->pdev->dev;
3453 new_smi->dev->driver = &ipmi_driver.driver;
3455 rv = platform_device_add(new_smi->pdev);
3458 "Unable to register system interface device:"
3463 new_smi->dev_registered = true;
3466 rv = ipmi_register_smi(&handlers,
3468 &new_smi->device_id,
3470 new_smi->slave_addr);
3472 dev_err(new_smi->dev, "Unable to register device: error %d\n",
3474 goto out_err_stop_timer;
3477 rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
3481 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3482 goto out_err_stop_timer;
3485 rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
3486 &smi_si_stats_proc_ops,
3489 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3490 goto out_err_stop_timer;
3493 rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
3494 &smi_params_proc_ops,
3497 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3498 goto out_err_stop_timer;
3501 dev_info(new_smi->dev, "IPMI %s interface initialized\n",
3502 si_to_str[new_smi->si_type]);
3507 wait_for_timer_and_thread(new_smi);
3510 new_smi->interrupt_disabled = true;
3512 if (new_smi->intf) {
3513 ipmi_smi_t intf = new_smi->intf;
3514 new_smi->intf = NULL;
3515 ipmi_unregister_smi(intf);
3518 if (new_smi->irq_cleanup) {
3519 new_smi->irq_cleanup(new_smi);
3520 new_smi->irq_cleanup = NULL;
3524 * Wait until we know that we are out of any interrupt
3525 * handlers might have been running before we freed the
3528 synchronize_sched();
3530 if (new_smi->si_sm) {
3531 if (new_smi->handlers)
3532 new_smi->handlers->cleanup(new_smi->si_sm);
3533 kfree(new_smi->si_sm);
3534 new_smi->si_sm = NULL;
3536 if (new_smi->addr_source_cleanup) {
3537 new_smi->addr_source_cleanup(new_smi);
3538 new_smi->addr_source_cleanup = NULL;
3540 if (new_smi->io_cleanup) {
3541 new_smi->io_cleanup(new_smi);
3542 new_smi->io_cleanup = NULL;
3545 if (new_smi->dev_registered) {
3546 platform_device_unregister(new_smi->pdev);
3547 new_smi->dev_registered = false;
3553 static int init_ipmi_si(void)
3559 enum ipmi_addr_src type = SI_INVALID;
3565 if (si_tryplatform) {
3566 rv = platform_driver_register(&ipmi_driver);
3568 printk(KERN_ERR PFX "Unable to register "
3569 "driver: %d\n", rv);
3574 /* Parse out the si_type string into its components. */
3577 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
3579 str = strchr(str, ',');
3589 printk(KERN_INFO "IPMI System Interface driver.\n");
3591 /* If the user gave us a device, they presumably want us to use it */
3592 if (!hardcode_find_bmc())
3597 rv = pci_register_driver(&ipmi_pci_driver);
3599 printk(KERN_ERR PFX "Unable to register "
3600 "PCI driver: %d\n", rv);
3602 pci_registered = true;
3608 pnp_register_driver(&ipmi_pnp_driver);
3609 pnp_registered = true;
3623 #ifdef CONFIG_PARISC
3624 register_parisc_driver(&ipmi_parisc_driver);
3625 parisc_registered = true;
3626 /* poking PC IO addresses will crash machine, don't do it */
3630 /* We prefer devices with interrupts, but in the case of a machine
3631 with multiple BMCs we assume that there will be several instances
3632 of a given type so if we succeed in registering a type then also
3633 try to register everything else of the same type */
3635 mutex_lock(&smi_infos_lock);
3636 list_for_each_entry(e, &smi_infos, link) {
3637 /* Try to register a device if it has an IRQ and we either
3638 haven't successfully registered a device yet or this
3639 device has the same type as one we successfully registered */
3640 if (e->irq && (!type || e->addr_source == type)) {
3641 if (!try_smi_init(e)) {
3642 type = e->addr_source;
3647 /* type will only have been set if we successfully registered an si */
3649 mutex_unlock(&smi_infos_lock);
3653 /* Fall back to the preferred device */
3655 list_for_each_entry(e, &smi_infos, link) {
3656 if (!e->irq && (!type || e->addr_source == type)) {
3657 if (!try_smi_init(e)) {
3658 type = e->addr_source;
3662 mutex_unlock(&smi_infos_lock);
3667 if (si_trydefaults) {
3668 mutex_lock(&smi_infos_lock);
3669 if (list_empty(&smi_infos)) {
3670 /* No BMC was found, try defaults. */
3671 mutex_unlock(&smi_infos_lock);
3674 mutex_unlock(&smi_infos_lock);
3677 mutex_lock(&smi_infos_lock);
3678 if (unload_when_empty && list_empty(&smi_infos)) {
3679 mutex_unlock(&smi_infos_lock);
3681 printk(KERN_WARNING PFX
3682 "Unable to find any System Interface(s)\n");
3685 mutex_unlock(&smi_infos_lock);
3689 module_init(init_ipmi_si);
3691 static void cleanup_one_si(struct smi_info *to_clean)
3698 if (to_clean->intf) {
3699 ipmi_smi_t intf = to_clean->intf;
3701 to_clean->intf = NULL;
3702 rv = ipmi_unregister_smi(intf);
3704 pr_err(PFX "Unable to unregister device: errno=%d\n",
3710 dev_set_drvdata(to_clean->dev, NULL);
3712 list_del(&to_clean->link);
3715 * Make sure that interrupts, the timer and the thread are
3716 * stopped and will not run again.
3718 if (to_clean->irq_cleanup)
3719 to_clean->irq_cleanup(to_clean);
3720 wait_for_timer_and_thread(to_clean);
3723 * Timeouts are stopped, now make sure the interrupts are off
3724 * in the BMC. Note that timers and CPU interrupts are off,
3725 * so no need for locks.
3727 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
3729 schedule_timeout_uninterruptible(1);
3731 disable_si_irq(to_clean);
3732 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
3734 schedule_timeout_uninterruptible(1);
3737 if (to_clean->handlers)
3738 to_clean->handlers->cleanup(to_clean->si_sm);
3740 kfree(to_clean->si_sm);
3742 if (to_clean->addr_source_cleanup)
3743 to_clean->addr_source_cleanup(to_clean);
3744 if (to_clean->io_cleanup)
3745 to_clean->io_cleanup(to_clean);
3747 if (to_clean->dev_registered)
3748 platform_device_unregister(to_clean->pdev);
3753 static void cleanup_ipmi_si(void)
3755 struct smi_info *e, *tmp_e;
3762 pci_unregister_driver(&ipmi_pci_driver);
3766 pnp_unregister_driver(&ipmi_pnp_driver);
3768 #ifdef CONFIG_PARISC
3769 if (parisc_registered)
3770 unregister_parisc_driver(&ipmi_parisc_driver);
3773 platform_driver_unregister(&ipmi_driver);
3775 mutex_lock(&smi_infos_lock);
3776 list_for_each_entry_safe(e, tmp_e, &smi_infos, link)
3778 mutex_unlock(&smi_infos_lock);
3780 module_exit(cleanup_ipmi_si);
3782 MODULE_LICENSE("GPL");
3783 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
3784 MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT"
3785 " system interfaces.");