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Linux/drivers/char/ipmi/ipmi_si_intf.c

  1 /*
  2  * ipmi_si.c
  3  *
  4  * The interface to the IPMI driver for the system interfaces (KCS, SMIC,
  5  * BT).
  6  *
  7  * Author: MontaVista Software, Inc.
  8  *         Corey Minyard <minyard@mvista.com>
  9  *         source@mvista.com
 10  *
 11  * Copyright 2002 MontaVista Software Inc.
 12  * Copyright 2006 IBM Corp., Christian Krafft <krafft@de.ibm.com>
 13  *
 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.
 18  *
 19  *
 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.
 30  *
 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.
 34  */
 35 
 36 /*
 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.
 40  */
 41 
 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>
 57 #include <asm/irq.h>
 58 #include <linux/interrupt.h>
 59 #include <linux/rcupdate.h>
 60 #include <linux/ipmi.h>
 61 #include <linux/ipmi_smi.h>
 62 #include <asm/io.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>
 72 
 73 #ifdef CONFIG_PARISC
 74 #include <asm/hardware.h>       /* for register_parisc_driver() stuff */
 75 #include <asm/parisc-device.h>
 76 #endif
 77 
 78 #define PFX "ipmi_si: "
 79 
 80 /* Measure times between events in the driver. */
 81 #undef DEBUG_TIMING
 82 
 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
 88                                       short timeout */
 89 
 90 enum si_intf_state {
 91         SI_NORMAL,
 92         SI_GETTING_FLAGS,
 93         SI_GETTING_EVENTS,
 94         SI_CLEARING_FLAGS,
 95         SI_CLEARING_FLAGS_THEN_SET_IRQ,
 96         SI_GETTING_MESSAGES,
 97         SI_ENABLE_INTERRUPTS1,
 98         SI_ENABLE_INTERRUPTS2,
 99         SI_DISABLE_INTERRUPTS1,
100         SI_DISABLE_INTERRUPTS2
101         /* FIXME - add watchdog stuff. */
102 };
103 
104 /* Some BT-specific defines we need here. */
105 #define IPMI_BT_INTMASK_REG             2
106 #define IPMI_BT_INTMASK_CLEAR_IRQ_BIT   2
107 #define IPMI_BT_INTMASK_ENABLE_IRQ_BIT  1
108 
109 enum si_type {
110     SI_KCS, SI_SMIC, SI_BT
111 };
112 static char *si_to_str[] = { "kcs", "smic", "bt" };
113 
114 static char *ipmi_addr_src_to_str[] = { NULL, "hotmod", "hardcoded", "SPMI",
115                                         "ACPI", "SMBIOS", "PCI",
116                                         "device-tree", "default" };
117 
118 #define DEVICE_NAME "ipmi_si"
119 
120 static struct platform_driver ipmi_driver;
121 
122 /*
123  * Indexes into stats[] in smi_info below.
124  */
125 enum si_stat_indexes {
126         /*
127          * Number of times the driver requested a timer while an operation
128          * was in progress.
129          */
130         SI_STAT_short_timeouts = 0,
131 
132         /*
133          * Number of times the driver requested a timer while nothing was in
134          * progress.
135          */
136         SI_STAT_long_timeouts,
137 
138         /* Number of times the interface was idle while being polled. */
139         SI_STAT_idles,
140 
141         /* Number of interrupts the driver handled. */
142         SI_STAT_interrupts,
143 
144         /* Number of time the driver got an ATTN from the hardware. */
145         SI_STAT_attentions,
146 
147         /* Number of times the driver requested flags from the hardware. */
148         SI_STAT_flag_fetches,
149 
150         /* Number of times the hardware didn't follow the state machine. */
151         SI_STAT_hosed_count,
152 
153         /* Number of completed messages. */
154         SI_STAT_complete_transactions,
155 
156         /* Number of IPMI events received from the hardware. */
157         SI_STAT_events,
158 
159         /* Number of watchdog pretimeouts. */
160         SI_STAT_watchdog_pretimeouts,
161 
162         /* Number of asynchronous messages received. */
163         SI_STAT_incoming_messages,
164 
165 
166         /* This *must* remain last, add new values above this. */
167         SI_NUM_STATS
168 };
169 
170 struct smi_info {
171         int                    intf_num;
172         ipmi_smi_t             intf;
173         struct si_sm_data      *si_sm;
174         struct si_sm_handlers  *handlers;
175         enum si_type           si_type;
176         spinlock_t             si_lock;
177         struct list_head       xmit_msgs;
178         struct list_head       hp_xmit_msgs;
179         struct ipmi_smi_msg    *curr_msg;
180         enum si_intf_state     si_state;
181 
182         /*
183          * Used to handle the various types of I/O that can occur with
184          * IPMI
185          */
186         struct si_sm_io io;
187         int (*io_setup)(struct smi_info *info);
188         void (*io_cleanup)(struct smi_info *info);
189         int (*irq_setup)(struct smi_info *info);
190         void (*irq_cleanup)(struct smi_info *info);
191         unsigned int io_size;
192         enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
193         void (*addr_source_cleanup)(struct smi_info *info);
194         void *addr_source_data;
195 
196         /*
197          * Per-OEM handler, called from handle_flags().  Returns 1
198          * when handle_flags() needs to be re-run or 0 indicating it
199          * set si_state itself.
200          */
201         int (*oem_data_avail_handler)(struct smi_info *smi_info);
202 
203         /*
204          * Flags from the last GET_MSG_FLAGS command, used when an ATTN
205          * is set to hold the flags until we are done handling everything
206          * from the flags.
207          */
208 #define RECEIVE_MSG_AVAIL       0x01
209 #define EVENT_MSG_BUFFER_FULL   0x02
210 #define WDT_PRE_TIMEOUT_INT     0x08
211 #define OEM0_DATA_AVAIL     0x20
212 #define OEM1_DATA_AVAIL     0x40
213 #define OEM2_DATA_AVAIL     0x80
214 #define OEM_DATA_AVAIL      (OEM0_DATA_AVAIL | \
215                              OEM1_DATA_AVAIL | \
216                              OEM2_DATA_AVAIL)
217         unsigned char       msg_flags;
218 
219         /* Does the BMC have an event buffer? */
220         bool                has_event_buffer;
221 
222         /*
223          * If set to true, this will request events the next time the
224          * state machine is idle.
225          */
226         atomic_t            req_events;
227 
228         /*
229          * If true, run the state machine to completion on every send
230          * call.  Generally used after a panic to make sure stuff goes
231          * out.
232          */
233         bool                run_to_completion;
234 
235         /* The I/O port of an SI interface. */
236         int                 port;
237 
238         /*
239          * The space between start addresses of the two ports.  For
240          * instance, if the first port is 0xca2 and the spacing is 4, then
241          * the second port is 0xca6.
242          */
243         unsigned int        spacing;
244 
245         /* zero if no irq; */
246         int                 irq;
247 
248         /* The timer for this si. */
249         struct timer_list   si_timer;
250 
251         /* This flag is set, if the timer is running (timer_pending() isn't enough) */
252         bool                timer_running;
253 
254         /* The time (in jiffies) the last timeout occurred at. */
255         unsigned long       last_timeout_jiffies;
256 
257         /* Used to gracefully stop the timer without race conditions. */
258         atomic_t            stop_operation;
259 
260         /* Are we waiting for the events, pretimeouts, received msgs? */
261         atomic_t            need_watch;
262 
263         /*
264          * The driver will disable interrupts when it gets into a
265          * situation where it cannot handle messages due to lack of
266          * memory.  Once that situation clears up, it will re-enable
267          * interrupts.
268          */
269         bool interrupt_disabled;
270 
271         /* From the get device id response... */
272         struct ipmi_device_id device_id;
273 
274         /* Driver model stuff. */
275         struct device *dev;
276         struct platform_device *pdev;
277 
278         /*
279          * True if we allocated the device, false if it came from
280          * someplace else (like PCI).
281          */
282         bool dev_registered;
283 
284         /* Slave address, could be reported from DMI. */
285         unsigned char slave_addr;
286 
287         /* Counters and things for the proc filesystem. */
288         atomic_t stats[SI_NUM_STATS];
289 
290         struct task_struct *thread;
291 
292         struct list_head link;
293         union ipmi_smi_info_union addr_info;
294 };
295 
296 #define smi_inc_stat(smi, stat) \
297         atomic_inc(&(smi)->stats[SI_STAT_ ## stat])
298 #define smi_get_stat(smi, stat) \
299         ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat]))
300 
301 #define SI_MAX_PARMS 4
302 
303 static int force_kipmid[SI_MAX_PARMS];
304 static int num_force_kipmid;
305 #ifdef CONFIG_PCI
306 static bool pci_registered;
307 #endif
308 #ifdef CONFIG_ACPI
309 static bool pnp_registered;
310 #endif
311 #ifdef CONFIG_PARISC
312 static bool parisc_registered;
313 #endif
314 
315 static unsigned int kipmid_max_busy_us[SI_MAX_PARMS];
316 static int num_max_busy_us;
317 
318 static bool unload_when_empty = true;
319 
320 static int add_smi(struct smi_info *smi);
321 static int try_smi_init(struct smi_info *smi);
322 static void cleanup_one_si(struct smi_info *to_clean);
323 static void cleanup_ipmi_si(void);
324 
325 static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list);
326 static int register_xaction_notifier(struct notifier_block *nb)
327 {
328         return atomic_notifier_chain_register(&xaction_notifier_list, nb);
329 }
330 
331 static void deliver_recv_msg(struct smi_info *smi_info,
332                              struct ipmi_smi_msg *msg)
333 {
334         /* Deliver the message to the upper layer. */
335         ipmi_smi_msg_received(smi_info->intf, msg);
336 }
337 
338 static void return_hosed_msg(struct smi_info *smi_info, int cCode)
339 {
340         struct ipmi_smi_msg *msg = smi_info->curr_msg;
341 
342         if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED)
343                 cCode = IPMI_ERR_UNSPECIFIED;
344         /* else use it as is */
345 
346         /* Make it a response */
347         msg->rsp[0] = msg->data[0] | 4;
348         msg->rsp[1] = msg->data[1];
349         msg->rsp[2] = cCode;
350         msg->rsp_size = 3;
351 
352         smi_info->curr_msg = NULL;
353         deliver_recv_msg(smi_info, msg);
354 }
355 
356 static enum si_sm_result start_next_msg(struct smi_info *smi_info)
357 {
358         int              rv;
359         struct list_head *entry = NULL;
360 #ifdef DEBUG_TIMING
361         struct timeval t;
362 #endif
363 
364         /* Pick the high priority queue first. */
365         if (!list_empty(&(smi_info->hp_xmit_msgs))) {
366                 entry = smi_info->hp_xmit_msgs.next;
367         } else if (!list_empty(&(smi_info->xmit_msgs))) {
368                 entry = smi_info->xmit_msgs.next;
369         }
370 
371         if (!entry) {
372                 smi_info->curr_msg = NULL;
373                 rv = SI_SM_IDLE;
374         } else {
375                 int err;
376 
377                 list_del(entry);
378                 smi_info->curr_msg = list_entry(entry,
379                                                 struct ipmi_smi_msg,
380                                                 link);
381 #ifdef DEBUG_TIMING
382                 do_gettimeofday(&t);
383                 printk(KERN_DEBUG "**Start2: %d.%9.9d\n", t.tv_sec, t.tv_usec);
384 #endif
385                 err = atomic_notifier_call_chain(&xaction_notifier_list,
386                                 0, smi_info);
387                 if (err & NOTIFY_STOP_MASK) {
388                         rv = SI_SM_CALL_WITHOUT_DELAY;
389                         goto out;
390                 }
391                 err = smi_info->handlers->start_transaction(
392                         smi_info->si_sm,
393                         smi_info->curr_msg->data,
394                         smi_info->curr_msg->data_size);
395                 if (err)
396                         return_hosed_msg(smi_info, err);
397 
398                 rv = SI_SM_CALL_WITHOUT_DELAY;
399         }
400  out:
401         return rv;
402 }
403 
404 static void start_enable_irq(struct smi_info *smi_info)
405 {
406         unsigned char msg[2];
407 
408         /*
409          * If we are enabling interrupts, we have to tell the
410          * BMC to use them.
411          */
412         msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
413         msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
414 
415         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
416         smi_info->si_state = SI_ENABLE_INTERRUPTS1;
417 }
418 
419 static void start_disable_irq(struct smi_info *smi_info)
420 {
421         unsigned char msg[2];
422 
423         msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
424         msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
425 
426         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
427         smi_info->si_state = SI_DISABLE_INTERRUPTS1;
428 }
429 
430 static void start_clear_flags(struct smi_info *smi_info)
431 {
432         unsigned char msg[3];
433 
434         /* Make sure the watchdog pre-timeout flag is not set at startup. */
435         msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
436         msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
437         msg[2] = WDT_PRE_TIMEOUT_INT;
438 
439         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
440         smi_info->si_state = SI_CLEARING_FLAGS;
441 }
442 
443 static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val)
444 {
445         smi_info->last_timeout_jiffies = jiffies;
446         mod_timer(&smi_info->si_timer, new_val);
447         smi_info->timer_running = true;
448 }
449 
450 /*
451  * When we have a situtaion where we run out of memory and cannot
452  * allocate messages, we just leave them in the BMC and run the system
453  * polled until we can allocate some memory.  Once we have some
454  * memory, we will re-enable the interrupt.
455  */
456 static inline void disable_si_irq(struct smi_info *smi_info)
457 {
458         if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
459                 start_disable_irq(smi_info);
460                 smi_info->interrupt_disabled = true;
461                 if (!atomic_read(&smi_info->stop_operation))
462                         smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
463         }
464 }
465 
466 static inline void enable_si_irq(struct smi_info *smi_info)
467 {
468         if ((smi_info->irq) && (smi_info->interrupt_disabled)) {
469                 start_enable_irq(smi_info);
470                 smi_info->interrupt_disabled = false;
471         }
472 }
473 
474 static void handle_flags(struct smi_info *smi_info)
475 {
476  retry:
477         if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
478                 /* Watchdog pre-timeout */
479                 smi_inc_stat(smi_info, watchdog_pretimeouts);
480 
481                 start_clear_flags(smi_info);
482                 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
483                 ipmi_smi_watchdog_pretimeout(smi_info->intf);
484         } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) {
485                 /* Messages available. */
486                 smi_info->curr_msg = ipmi_alloc_smi_msg();
487                 if (!smi_info->curr_msg) {
488                         disable_si_irq(smi_info);
489                         smi_info->si_state = SI_NORMAL;
490                         return;
491                 }
492                 enable_si_irq(smi_info);
493 
494                 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
495                 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD;
496                 smi_info->curr_msg->data_size = 2;
497 
498                 smi_info->handlers->start_transaction(
499                         smi_info->si_sm,
500                         smi_info->curr_msg->data,
501                         smi_info->curr_msg->data_size);
502                 smi_info->si_state = SI_GETTING_MESSAGES;
503         } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) {
504                 /* Events available. */
505                 smi_info->curr_msg = ipmi_alloc_smi_msg();
506                 if (!smi_info->curr_msg) {
507                         disable_si_irq(smi_info);
508                         smi_info->si_state = SI_NORMAL;
509                         return;
510                 }
511                 enable_si_irq(smi_info);
512 
513                 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
514                 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
515                 smi_info->curr_msg->data_size = 2;
516 
517                 smi_info->handlers->start_transaction(
518                         smi_info->si_sm,
519                         smi_info->curr_msg->data,
520                         smi_info->curr_msg->data_size);
521                 smi_info->si_state = SI_GETTING_EVENTS;
522         } else if (smi_info->msg_flags & OEM_DATA_AVAIL &&
523                    smi_info->oem_data_avail_handler) {
524                 if (smi_info->oem_data_avail_handler(smi_info))
525                         goto retry;
526         } else
527                 smi_info->si_state = SI_NORMAL;
528 }
529 
530 static void handle_transaction_done(struct smi_info *smi_info)
531 {
532         struct ipmi_smi_msg *msg;
533 #ifdef DEBUG_TIMING
534         struct timeval t;
535 
536         do_gettimeofday(&t);
537         printk(KERN_DEBUG "**Done: %d.%9.9d\n", t.tv_sec, t.tv_usec);
538 #endif
539         switch (smi_info->si_state) {
540         case SI_NORMAL:
541                 if (!smi_info->curr_msg)
542                         break;
543 
544                 smi_info->curr_msg->rsp_size
545                         = smi_info->handlers->get_result(
546                                 smi_info->si_sm,
547                                 smi_info->curr_msg->rsp,
548                                 IPMI_MAX_MSG_LENGTH);
549 
550                 /*
551                  * Do this here becase deliver_recv_msg() releases the
552                  * lock, and a new message can be put in during the
553                  * time the lock is released.
554                  */
555                 msg = smi_info->curr_msg;
556                 smi_info->curr_msg = NULL;
557                 deliver_recv_msg(smi_info, msg);
558                 break;
559 
560         case SI_GETTING_FLAGS:
561         {
562                 unsigned char msg[4];
563                 unsigned int  len;
564 
565                 /* We got the flags from the SMI, now handle them. */
566                 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
567                 if (msg[2] != 0) {
568                         /* Error fetching flags, just give up for now. */
569                         smi_info->si_state = SI_NORMAL;
570                 } else if (len < 4) {
571                         /*
572                          * Hmm, no flags.  That's technically illegal, but
573                          * don't use uninitialized data.
574                          */
575                         smi_info->si_state = SI_NORMAL;
576                 } else {
577                         smi_info->msg_flags = msg[3];
578                         handle_flags(smi_info);
579                 }
580                 break;
581         }
582 
583         case SI_CLEARING_FLAGS:
584         case SI_CLEARING_FLAGS_THEN_SET_IRQ:
585         {
586                 unsigned char msg[3];
587 
588                 /* We cleared the flags. */
589                 smi_info->handlers->get_result(smi_info->si_sm, msg, 3);
590                 if (msg[2] != 0) {
591                         /* Error clearing flags */
592                         dev_warn(smi_info->dev,
593                                  "Error clearing flags: %2.2x\n", msg[2]);
594                 }
595                 if (smi_info->si_state == SI_CLEARING_FLAGS_THEN_SET_IRQ)
596                         start_enable_irq(smi_info);
597                 else
598                         smi_info->si_state = SI_NORMAL;
599                 break;
600         }
601 
602         case SI_GETTING_EVENTS:
603         {
604                 smi_info->curr_msg->rsp_size
605                         = smi_info->handlers->get_result(
606                                 smi_info->si_sm,
607                                 smi_info->curr_msg->rsp,
608                                 IPMI_MAX_MSG_LENGTH);
609 
610                 /*
611                  * Do this here becase deliver_recv_msg() releases the
612                  * lock, and a new message can be put in during the
613                  * time the lock is released.
614                  */
615                 msg = smi_info->curr_msg;
616                 smi_info->curr_msg = NULL;
617                 if (msg->rsp[2] != 0) {
618                         /* Error getting event, probably done. */
619                         msg->done(msg);
620 
621                         /* Take off the event flag. */
622                         smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
623                         handle_flags(smi_info);
624                 } else {
625                         smi_inc_stat(smi_info, events);
626 
627                         /*
628                          * Do this before we deliver the message
629                          * because delivering the message releases the
630                          * lock and something else can mess with the
631                          * state.
632                          */
633                         handle_flags(smi_info);
634 
635                         deliver_recv_msg(smi_info, msg);
636                 }
637                 break;
638         }
639 
640         case SI_GETTING_MESSAGES:
641         {
642                 smi_info->curr_msg->rsp_size
643                         = smi_info->handlers->get_result(
644                                 smi_info->si_sm,
645                                 smi_info->curr_msg->rsp,
646                                 IPMI_MAX_MSG_LENGTH);
647 
648                 /*
649                  * Do this here becase deliver_recv_msg() releases the
650                  * lock, and a new message can be put in during the
651                  * time the lock is released.
652                  */
653                 msg = smi_info->curr_msg;
654                 smi_info->curr_msg = NULL;
655                 if (msg->rsp[2] != 0) {
656                         /* Error getting event, probably done. */
657                         msg->done(msg);
658 
659                         /* Take off the msg flag. */
660                         smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
661                         handle_flags(smi_info);
662                 } else {
663                         smi_inc_stat(smi_info, incoming_messages);
664 
665                         /*
666                          * Do this before we deliver the message
667                          * because delivering the message releases the
668                          * lock and something else can mess with the
669                          * state.
670                          */
671                         handle_flags(smi_info);
672 
673                         deliver_recv_msg(smi_info, msg);
674                 }
675                 break;
676         }
677 
678         case SI_ENABLE_INTERRUPTS1:
679         {
680                 unsigned char msg[4];
681 
682                 /* We got the flags from the SMI, now handle them. */
683                 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
684                 if (msg[2] != 0) {
685                         dev_warn(smi_info->dev,
686                                  "Couldn't get irq info: %x.\n", msg[2]);
687                         dev_warn(smi_info->dev,
688                                  "Maybe ok, but ipmi might run very slowly.\n");
689                         smi_info->si_state = SI_NORMAL;
690                 } else {
691                         msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
692                         msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
693                         msg[2] = (msg[3] |
694                                   IPMI_BMC_RCV_MSG_INTR |
695                                   IPMI_BMC_EVT_MSG_INTR);
696                         smi_info->handlers->start_transaction(
697                                 smi_info->si_sm, msg, 3);
698                         smi_info->si_state = SI_ENABLE_INTERRUPTS2;
699                 }
700                 break;
701         }
702 
703         case SI_ENABLE_INTERRUPTS2:
704         {
705                 unsigned char msg[4];
706 
707                 /* We got the flags from the SMI, now handle them. */
708                 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
709                 if (msg[2] != 0) {
710                         dev_warn(smi_info->dev,
711                                  "Couldn't set irq info: %x.\n", msg[2]);
712                         dev_warn(smi_info->dev,
713                                  "Maybe ok, but ipmi might run very slowly.\n");
714                 } else
715                         smi_info->interrupt_disabled = false;
716                 smi_info->si_state = SI_NORMAL;
717                 break;
718         }
719 
720         case SI_DISABLE_INTERRUPTS1:
721         {
722                 unsigned char msg[4];
723 
724                 /* We got the flags from the SMI, now handle them. */
725                 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
726                 if (msg[2] != 0) {
727                         dev_warn(smi_info->dev, "Could not disable interrupts"
728                                  ", failed get.\n");
729                         smi_info->si_state = SI_NORMAL;
730                 } else {
731                         msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
732                         msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
733                         msg[2] = (msg[3] &
734                                   ~(IPMI_BMC_RCV_MSG_INTR |
735                                     IPMI_BMC_EVT_MSG_INTR));
736                         smi_info->handlers->start_transaction(
737                                 smi_info->si_sm, msg, 3);
738                         smi_info->si_state = SI_DISABLE_INTERRUPTS2;
739                 }
740                 break;
741         }
742 
743         case SI_DISABLE_INTERRUPTS2:
744         {
745                 unsigned char msg[4];
746 
747                 /* We got the flags from the SMI, now handle them. */
748                 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
749                 if (msg[2] != 0) {
750                         dev_warn(smi_info->dev, "Could not disable interrupts"
751                                  ", failed set.\n");
752                 }
753                 smi_info->si_state = SI_NORMAL;
754                 break;
755         }
756         }
757 }
758 
759 /*
760  * Called on timeouts and events.  Timeouts should pass the elapsed
761  * time, interrupts should pass in zero.  Must be called with
762  * si_lock held and interrupts disabled.
763  */
764 static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
765                                            int time)
766 {
767         enum si_sm_result si_sm_result;
768 
769  restart:
770         /*
771          * There used to be a loop here that waited a little while
772          * (around 25us) before giving up.  That turned out to be
773          * pointless, the minimum delays I was seeing were in the 300us
774          * range, which is far too long to wait in an interrupt.  So
775          * we just run until the state machine tells us something
776          * happened or it needs a delay.
777          */
778         si_sm_result = smi_info->handlers->event(smi_info->si_sm, time);
779         time = 0;
780         while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY)
781                 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
782 
783         if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) {
784                 smi_inc_stat(smi_info, complete_transactions);
785 
786                 handle_transaction_done(smi_info);
787                 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
788         } else if (si_sm_result == SI_SM_HOSED) {
789                 smi_inc_stat(smi_info, hosed_count);
790 
791                 /*
792                  * Do the before return_hosed_msg, because that
793                  * releases the lock.
794                  */
795                 smi_info->si_state = SI_NORMAL;
796                 if (smi_info->curr_msg != NULL) {
797                         /*
798                          * If we were handling a user message, format
799                          * a response to send to the upper layer to
800                          * tell it about the error.
801                          */
802                         return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED);
803                 }
804                 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
805         }
806 
807         /*
808          * We prefer handling attn over new messages.  But don't do
809          * this if there is not yet an upper layer to handle anything.
810          */
811         if (likely(smi_info->intf) && si_sm_result == SI_SM_ATTN) {
812                 unsigned char msg[2];
813 
814                 smi_inc_stat(smi_info, attentions);
815 
816                 /*
817                  * Got a attn, send down a get message flags to see
818                  * what's causing it.  It would be better to handle
819                  * this in the upper layer, but due to the way
820                  * interrupts work with the SMI, that's not really
821                  * possible.
822                  */
823                 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
824                 msg[1] = IPMI_GET_MSG_FLAGS_CMD;
825 
826                 smi_info->handlers->start_transaction(
827                         smi_info->si_sm, msg, 2);
828                 smi_info->si_state = SI_GETTING_FLAGS;
829                 goto restart;
830         }
831 
832         /* If we are currently idle, try to start the next message. */
833         if (si_sm_result == SI_SM_IDLE) {
834                 smi_inc_stat(smi_info, idles);
835 
836                 si_sm_result = start_next_msg(smi_info);
837                 if (si_sm_result != SI_SM_IDLE)
838                         goto restart;
839         }
840 
841         if ((si_sm_result == SI_SM_IDLE)
842             && (atomic_read(&smi_info->req_events))) {
843                 /*
844                  * We are idle and the upper layer requested that I fetch
845                  * events, so do so.
846                  */
847                 atomic_set(&smi_info->req_events, 0);
848 
849                 smi_info->curr_msg = ipmi_alloc_smi_msg();
850                 if (!smi_info->curr_msg)
851                         goto out;
852 
853                 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
854                 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
855                 smi_info->curr_msg->data_size = 2;
856 
857                 smi_info->handlers->start_transaction(
858                         smi_info->si_sm,
859                         smi_info->curr_msg->data,
860                         smi_info->curr_msg->data_size);
861                 smi_info->si_state = SI_GETTING_EVENTS;
862                 goto restart;
863         }
864  out:
865         return si_sm_result;
866 }
867 
868 static void check_start_timer_thread(struct smi_info *smi_info)
869 {
870         if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
871                 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
872 
873                 if (smi_info->thread)
874                         wake_up_process(smi_info->thread);
875 
876                 start_next_msg(smi_info);
877                 smi_event_handler(smi_info, 0);
878         }
879 }
880 
881 static void sender(void                *send_info,
882                    struct ipmi_smi_msg *msg,
883                    int                 priority)
884 {
885         struct smi_info   *smi_info = send_info;
886         enum si_sm_result result;
887         unsigned long     flags;
888 #ifdef DEBUG_TIMING
889         struct timeval    t;
890 #endif
891 
892         if (atomic_read(&smi_info->stop_operation)) {
893                 msg->rsp[0] = msg->data[0] | 4;
894                 msg->rsp[1] = msg->data[1];
895                 msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
896                 msg->rsp_size = 3;
897                 deliver_recv_msg(smi_info, msg);
898                 return;
899         }
900 
901 #ifdef DEBUG_TIMING
902         do_gettimeofday(&t);
903         printk("**Enqueue: %d.%9.9d\n", t.tv_sec, t.tv_usec);
904 #endif
905 
906         if (smi_info->run_to_completion) {
907                 /*
908                  * If we are running to completion, then throw it in
909                  * the list and run transactions until everything is
910                  * clear.  Priority doesn't matter here.
911                  */
912 
913                 /*
914                  * Run to completion means we are single-threaded, no
915                  * need for locks.
916                  */
917                 list_add_tail(&(msg->link), &(smi_info->xmit_msgs));
918 
919                 result = smi_event_handler(smi_info, 0);
920                 while (result != SI_SM_IDLE) {
921                         udelay(SI_SHORT_TIMEOUT_USEC);
922                         result = smi_event_handler(smi_info,
923                                                    SI_SHORT_TIMEOUT_USEC);
924                 }
925                 return;
926         }
927 
928         spin_lock_irqsave(&smi_info->si_lock, flags);
929         if (priority > 0)
930                 list_add_tail(&msg->link, &smi_info->hp_xmit_msgs);
931         else
932                 list_add_tail(&msg->link, &smi_info->xmit_msgs);
933 
934         check_start_timer_thread(smi_info);
935         spin_unlock_irqrestore(&smi_info->si_lock, flags);
936 }
937 
938 static void set_run_to_completion(void *send_info, bool i_run_to_completion)
939 {
940         struct smi_info   *smi_info = send_info;
941         enum si_sm_result result;
942 
943         smi_info->run_to_completion = i_run_to_completion;
944         if (i_run_to_completion) {
945                 result = smi_event_handler(smi_info, 0);
946                 while (result != SI_SM_IDLE) {
947                         udelay(SI_SHORT_TIMEOUT_USEC);
948                         result = smi_event_handler(smi_info,
949                                                    SI_SHORT_TIMEOUT_USEC);
950                 }
951         }
952 }
953 
954 /*
955  * Use -1 in the nsec value of the busy waiting timespec to tell that
956  * we are spinning in kipmid looking for something and not delaying
957  * between checks
958  */
959 static inline void ipmi_si_set_not_busy(struct timespec *ts)
960 {
961         ts->tv_nsec = -1;
962 }
963 static inline int ipmi_si_is_busy(struct timespec *ts)
964 {
965         return ts->tv_nsec != -1;
966 }
967 
968 static int ipmi_thread_busy_wait(enum si_sm_result smi_result,
969                                  const struct smi_info *smi_info,
970                                  struct timespec *busy_until)
971 {
972         unsigned int max_busy_us = 0;
973 
974         if (smi_info->intf_num < num_max_busy_us)
975                 max_busy_us = kipmid_max_busy_us[smi_info->intf_num];
976         if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY)
977                 ipmi_si_set_not_busy(busy_until);
978         else if (!ipmi_si_is_busy(busy_until)) {
979                 getnstimeofday(busy_until);
980                 timespec_add_ns(busy_until, max_busy_us*NSEC_PER_USEC);
981         } else {
982                 struct timespec now;
983                 getnstimeofday(&now);
984                 if (unlikely(timespec_compare(&now, busy_until) > 0)) {
985                         ipmi_si_set_not_busy(busy_until);
986                         return 0;
987                 }
988         }
989         return 1;
990 }
991 
992 
993 /*
994  * A busy-waiting loop for speeding up IPMI operation.
995  *
996  * Lousy hardware makes this hard.  This is only enabled for systems
997  * that are not BT and do not have interrupts.  It starts spinning
998  * when an operation is complete or until max_busy tells it to stop
999  * (if that is enabled).  See the paragraph on kimid_max_busy_us in
1000  * Documentation/IPMI.txt for details.
1001  */
1002 static int ipmi_thread(void *data)
1003 {
1004         struct smi_info *smi_info = data;
1005         unsigned long flags;
1006         enum si_sm_result smi_result;
1007         struct timespec busy_until;
1008 
1009         ipmi_si_set_not_busy(&busy_until);
1010         set_user_nice(current, MAX_NICE);
1011         while (!kthread_should_stop()) {
1012                 int busy_wait;
1013 
1014                 spin_lock_irqsave(&(smi_info->si_lock), flags);
1015                 smi_result = smi_event_handler(smi_info, 0);
1016 
1017                 /*
1018                  * If the driver is doing something, there is a possible
1019                  * race with the timer.  If the timer handler see idle,
1020                  * and the thread here sees something else, the timer
1021                  * handler won't restart the timer even though it is
1022                  * required.  So start it here if necessary.
1023                  */
1024                 if (smi_result != SI_SM_IDLE && !smi_info->timer_running)
1025                         smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
1026 
1027                 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1028                 busy_wait = ipmi_thread_busy_wait(smi_result, smi_info,
1029                                                   &busy_until);
1030                 if (smi_result == SI_SM_CALL_WITHOUT_DELAY)
1031                         ; /* do nothing */
1032                 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
1033                         schedule();
1034                 else if (smi_result == SI_SM_IDLE) {
1035                         if (atomic_read(&smi_info->need_watch)) {
1036                                 schedule_timeout_interruptible(100);
1037                         } else {
1038                                 /* Wait to be woken up when we are needed. */
1039                                 __set_current_state(TASK_INTERRUPTIBLE);
1040                                 schedule();
1041                         }
1042                 } else
1043                         schedule_timeout_interruptible(1);
1044         }
1045         return 0;
1046 }
1047 
1048 
1049 static void poll(void *send_info)
1050 {
1051         struct smi_info *smi_info = send_info;
1052         unsigned long flags = 0;
1053         bool run_to_completion = smi_info->run_to_completion;
1054 
1055         /*
1056          * Make sure there is some delay in the poll loop so we can
1057          * drive time forward and timeout things.
1058          */
1059         udelay(10);
1060         if (!run_to_completion)
1061                 spin_lock_irqsave(&smi_info->si_lock, flags);
1062         smi_event_handler(smi_info, 10);
1063         if (!run_to_completion)
1064                 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1065 }
1066 
1067 static void request_events(void *send_info)
1068 {
1069         struct smi_info *smi_info = send_info;
1070 
1071         if (atomic_read(&smi_info->stop_operation) ||
1072                                 !smi_info->has_event_buffer)
1073                 return;
1074 
1075         atomic_set(&smi_info->req_events, 1);
1076 }
1077 
1078 static void set_need_watch(void *send_info, bool enable)
1079 {
1080         struct smi_info *smi_info = send_info;
1081         unsigned long flags;
1082 
1083         atomic_set(&smi_info->need_watch, enable);
1084         spin_lock_irqsave(&smi_info->si_lock, flags);
1085         check_start_timer_thread(smi_info);
1086         spin_unlock_irqrestore(&smi_info->si_lock, flags);
1087 }
1088 
1089 static int initialized;
1090 
1091 static void smi_timeout(unsigned long data)
1092 {
1093         struct smi_info   *smi_info = (struct smi_info *) data;
1094         enum si_sm_result smi_result;
1095         unsigned long     flags;
1096         unsigned long     jiffies_now;
1097         long              time_diff;
1098         long              timeout;
1099 #ifdef DEBUG_TIMING
1100         struct timeval    t;
1101 #endif
1102 
1103         spin_lock_irqsave(&(smi_info->si_lock), flags);
1104 #ifdef DEBUG_TIMING
1105         do_gettimeofday(&t);
1106         printk(KERN_DEBUG "**Timer: %d.%9.9d\n", t.tv_sec, t.tv_usec);
1107 #endif
1108         jiffies_now = jiffies;
1109         time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies)
1110                      * SI_USEC_PER_JIFFY);
1111         smi_result = smi_event_handler(smi_info, time_diff);
1112 
1113         if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
1114                 /* Running with interrupts, only do long timeouts. */
1115                 timeout = jiffies + SI_TIMEOUT_JIFFIES;
1116                 smi_inc_stat(smi_info, long_timeouts);
1117                 goto do_mod_timer;
1118         }
1119 
1120         /*
1121          * If the state machine asks for a short delay, then shorten
1122          * the timer timeout.
1123          */
1124         if (smi_result == SI_SM_CALL_WITH_DELAY) {
1125                 smi_inc_stat(smi_info, short_timeouts);
1126                 timeout = jiffies + 1;
1127         } else {
1128                 smi_inc_stat(smi_info, long_timeouts);
1129                 timeout = jiffies + SI_TIMEOUT_JIFFIES;
1130         }
1131 
1132  do_mod_timer:
1133         if (smi_result != SI_SM_IDLE)
1134                 smi_mod_timer(smi_info, timeout);
1135         else
1136                 smi_info->timer_running = false;
1137         spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1138 }
1139 
1140 static irqreturn_t si_irq_handler(int irq, void *data)
1141 {
1142         struct smi_info *smi_info = data;
1143         unsigned long   flags;
1144 #ifdef DEBUG_TIMING
1145         struct timeval  t;
1146 #endif
1147 
1148         spin_lock_irqsave(&(smi_info->si_lock), flags);
1149 
1150         smi_inc_stat(smi_info, interrupts);
1151 
1152 #ifdef DEBUG_TIMING
1153         do_gettimeofday(&t);
1154         printk(KERN_DEBUG "**Interrupt: %d.%9.9d\n", t.tv_sec, t.tv_usec);
1155 #endif
1156         smi_event_handler(smi_info, 0);
1157         spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1158         return IRQ_HANDLED;
1159 }
1160 
1161 static irqreturn_t si_bt_irq_handler(int irq, void *data)
1162 {
1163         struct smi_info *smi_info = data;
1164         /* We need to clear the IRQ flag for the BT interface. */
1165         smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
1166                              IPMI_BT_INTMASK_CLEAR_IRQ_BIT
1167                              | IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1168         return si_irq_handler(irq, data);
1169 }
1170 
1171 static int smi_start_processing(void       *send_info,
1172                                 ipmi_smi_t intf)
1173 {
1174         struct smi_info *new_smi = send_info;
1175         int             enable = 0;
1176 
1177         new_smi->intf = intf;
1178 
1179         /* Try to claim any interrupts. */
1180         if (new_smi->irq_setup)
1181                 new_smi->irq_setup(new_smi);
1182 
1183         /* Set up the timer that drives the interface. */
1184         setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi);
1185         smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES);
1186 
1187         /*
1188          * Check if the user forcefully enabled the daemon.
1189          */
1190         if (new_smi->intf_num < num_force_kipmid)
1191                 enable = force_kipmid[new_smi->intf_num];
1192         /*
1193          * The BT interface is efficient enough to not need a thread,
1194          * and there is no need for a thread if we have interrupts.
1195          */
1196         else if ((new_smi->si_type != SI_BT) && (!new_smi->irq))
1197                 enable = 1;
1198 
1199         if (enable) {
1200                 new_smi->thread = kthread_run(ipmi_thread, new_smi,
1201                                               "kipmi%d", new_smi->intf_num);
1202                 if (IS_ERR(new_smi->thread)) {
1203                         dev_notice(new_smi->dev, "Could not start"
1204                                    " kernel thread due to error %ld, only using"
1205                                    " timers to drive the interface\n",
1206                                    PTR_ERR(new_smi->thread));
1207                         new_smi->thread = NULL;
1208                 }
1209         }
1210 
1211         return 0;
1212 }
1213 
1214 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1215 {
1216         struct smi_info *smi = send_info;
1217 
1218         data->addr_src = smi->addr_source;
1219         data->dev = smi->dev;
1220         data->addr_info = smi->addr_info;
1221         get_device(smi->dev);
1222 
1223         return 0;
1224 }
1225 
1226 static void set_maintenance_mode(void *send_info, bool enable)
1227 {
1228         struct smi_info   *smi_info = send_info;
1229 
1230         if (!enable)
1231                 atomic_set(&smi_info->req_events, 0);
1232 }
1233 
1234 static struct ipmi_smi_handlers handlers = {
1235         .owner                  = THIS_MODULE,
1236         .start_processing       = smi_start_processing,
1237         .get_smi_info           = get_smi_info,
1238         .sender                 = sender,
1239         .request_events         = request_events,
1240         .set_need_watch         = set_need_watch,
1241         .set_maintenance_mode   = set_maintenance_mode,
1242         .set_run_to_completion  = set_run_to_completion,
1243         .poll                   = poll,
1244 };
1245 
1246 /*
1247  * There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
1248  * a default IO port, and 1 ACPI/SPMI address.  That sets SI_MAX_DRIVERS.
1249  */
1250 
1251 static LIST_HEAD(smi_infos);
1252 static DEFINE_MUTEX(smi_infos_lock);
1253 static int smi_num; /* Used to sequence the SMIs */
1254 
1255 #define DEFAULT_REGSPACING      1
1256 #define DEFAULT_REGSIZE         1
1257 
1258 #ifdef CONFIG_ACPI
1259 static bool          si_tryacpi = 1;
1260 #endif
1261 #ifdef CONFIG_DMI
1262 static bool          si_trydmi = 1;
1263 #endif
1264 static bool          si_tryplatform = 1;
1265 #ifdef CONFIG_PCI
1266 static bool          si_trypci = 1;
1267 #endif
1268 static bool          si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
1269 static char          *si_type[SI_MAX_PARMS];
1270 #define MAX_SI_TYPE_STR 30
1271 static char          si_type_str[MAX_SI_TYPE_STR];
1272 static unsigned long addrs[SI_MAX_PARMS];
1273 static unsigned int num_addrs;
1274 static unsigned int  ports[SI_MAX_PARMS];
1275 static unsigned int num_ports;
1276 static int           irqs[SI_MAX_PARMS];
1277 static unsigned int num_irqs;
1278 static int           regspacings[SI_MAX_PARMS];
1279 static unsigned int num_regspacings;
1280 static int           regsizes[SI_MAX_PARMS];
1281 static unsigned int num_regsizes;
1282 static int           regshifts[SI_MAX_PARMS];
1283 static unsigned int num_regshifts;
1284 static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */
1285 static unsigned int num_slave_addrs;
1286 
1287 #define IPMI_IO_ADDR_SPACE  0
1288 #define IPMI_MEM_ADDR_SPACE 1
1289 static char *addr_space_to_str[] = { "i/o", "mem" };
1290 
1291 static int hotmod_handler(const char *val, struct kernel_param *kp);
1292 
1293 module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
1294 MODULE_PARM_DESC(hotmod, "Add and remove interfaces.  See"
1295                  " Documentation/IPMI.txt in the kernel sources for the"
1296                  " gory details.");
1297 
1298 #ifdef CONFIG_ACPI
1299 module_param_named(tryacpi, si_tryacpi, bool, 0);
1300 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1301                  " default scan of the interfaces identified via ACPI");
1302 #endif
1303 #ifdef CONFIG_DMI
1304 module_param_named(trydmi, si_trydmi, bool, 0);
1305 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
1306                  " default scan of the interfaces identified via DMI");
1307 #endif
1308 module_param_named(tryplatform, si_tryplatform, bool, 0);
1309 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1310                  " default scan of the interfaces identified via platform"
1311                  " interfaces like openfirmware");
1312 #ifdef CONFIG_PCI
1313 module_param_named(trypci, si_trypci, bool, 0);
1314 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1315                  " default scan of the interfaces identified via pci");
1316 #endif
1317 module_param_named(trydefaults, si_trydefaults, bool, 0);
1318 MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the"
1319                  " default scan of the KCS and SMIC interface at the standard"
1320                  " address");
1321 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
1322 MODULE_PARM_DESC(type, "Defines the type of each interface, each"
1323                  " interface separated by commas.  The types are 'kcs',"
1324                  " 'smic', and 'bt'.  For example si_type=kcs,bt will set"
1325                  " the first interface to kcs and the second to bt");
1326 module_param_array(addrs, ulong, &num_addrs, 0);
1327 MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
1328                  " addresses separated by commas.  Only use if an interface"
1329                  " is in memory.  Otherwise, set it to zero or leave"
1330                  " it blank.");
1331 module_param_array(ports, uint, &num_ports, 0);
1332 MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
1333                  " addresses separated by commas.  Only use if an interface"
1334                  " is a port.  Otherwise, set it to zero or leave"
1335                  " it blank.");
1336 module_param_array(irqs, int, &num_irqs, 0);
1337 MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
1338                  " addresses separated by commas.  Only use if an interface"
1339                  " has an interrupt.  Otherwise, set it to zero or leave"
1340                  " it blank.");
1341 module_param_array(regspacings, int, &num_regspacings, 0);
1342 MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
1343                  " and each successive register used by the interface.  For"
1344                  " instance, if the start address is 0xca2 and the spacing"
1345                  " is 2, then the second address is at 0xca4.  Defaults"
1346                  " to 1.");
1347 module_param_array(regsizes, int, &num_regsizes, 0);
1348 MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
1349                  " This should generally be 1, 2, 4, or 8 for an 8-bit,"
1350                  " 16-bit, 32-bit, or 64-bit register.  Use this if you"
1351                  " the 8-bit IPMI register has to be read from a larger"
1352                  " register.");
1353 module_param_array(regshifts, int, &num_regshifts, 0);
1354 MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
1355                  " IPMI register, in bits.  For instance, if the data"
1356                  " is read from a 32-bit word and the IPMI data is in"
1357                  " bit 8-15, then the shift would be 8");
1358 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1359 MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
1360                  " the controller.  Normally this is 0x20, but can be"
1361                  " overridden by this parm.  This is an array indexed"
1362                  " by interface number.");
1363 module_param_array(force_kipmid, int, &num_force_kipmid, 0);
1364 MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or"
1365                  " disabled(0).  Normally the IPMI driver auto-detects"
1366                  " this, but the value may be overridden by this parm.");
1367 module_param(unload_when_empty, bool, 0);
1368 MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are"
1369                  " specified or found, default is 1.  Setting to 0"
1370                  " is useful for hot add of devices using hotmod.");
1371 module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644);
1372 MODULE_PARM_DESC(kipmid_max_busy_us,
1373                  "Max time (in microseconds) to busy-wait for IPMI data before"
1374                  " sleeping. 0 (default) means to wait forever. Set to 100-500"
1375                  " if kipmid is using up a lot of CPU time.");
1376 
1377 
1378 static void std_irq_cleanup(struct smi_info *info)
1379 {
1380         if (info->si_type == SI_BT)
1381                 /* Disable the interrupt in the BT interface. */
1382                 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0);
1383         free_irq(info->irq, info);
1384 }
1385 
1386 static int std_irq_setup(struct smi_info *info)
1387 {
1388         int rv;
1389 
1390         if (!info->irq)
1391                 return 0;
1392 
1393         if (info->si_type == SI_BT) {
1394                 rv = request_irq(info->irq,
1395                                  si_bt_irq_handler,
1396                                  IRQF_SHARED,
1397                                  DEVICE_NAME,
1398                                  info);
1399                 if (!rv)
1400                         /* Enable the interrupt in the BT interface. */
1401                         info->io.outputb(&info->io, IPMI_BT_INTMASK_REG,
1402                                          IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1403         } else
1404                 rv = request_irq(info->irq,
1405                                  si_irq_handler,
1406                                  IRQF_SHARED,
1407                                  DEVICE_NAME,
1408                                  info);
1409         if (rv) {
1410                 dev_warn(info->dev, "%s unable to claim interrupt %d,"
1411                          " running polled\n",
1412                          DEVICE_NAME, info->irq);
1413                 info->irq = 0;
1414         } else {
1415                 info->irq_cleanup = std_irq_cleanup;
1416                 dev_info(info->dev, "Using irq %d\n", info->irq);
1417         }
1418 
1419         return rv;
1420 }
1421 
1422 static unsigned char port_inb(struct si_sm_io *io, unsigned int offset)
1423 {
1424         unsigned int addr = io->addr_data;
1425 
1426         return inb(addr + (offset * io->regspacing));
1427 }
1428 
1429 static void port_outb(struct si_sm_io *io, unsigned int offset,
1430                       unsigned char b)
1431 {
1432         unsigned int addr = io->addr_data;
1433 
1434         outb(b, addr + (offset * io->regspacing));
1435 }
1436 
1437 static unsigned char port_inw(struct si_sm_io *io, unsigned int offset)
1438 {
1439         unsigned int addr = io->addr_data;
1440 
1441         return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1442 }
1443 
1444 static void port_outw(struct si_sm_io *io, unsigned int offset,
1445                       unsigned char b)
1446 {
1447         unsigned int addr = io->addr_data;
1448 
1449         outw(b << io->regshift, addr + (offset * io->regspacing));
1450 }
1451 
1452 static unsigned char port_inl(struct si_sm_io *io, unsigned int offset)
1453 {
1454         unsigned int addr = io->addr_data;
1455 
1456         return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1457 }
1458 
1459 static void port_outl(struct si_sm_io *io, unsigned int offset,
1460                       unsigned char b)
1461 {
1462         unsigned int addr = io->addr_data;
1463 
1464         outl(b << io->regshift, addr+(offset * io->regspacing));
1465 }
1466 
1467 static void port_cleanup(struct smi_info *info)
1468 {
1469         unsigned int addr = info->io.addr_data;
1470         int          idx;
1471 
1472         if (addr) {
1473                 for (idx = 0; idx < info->io_size; idx++)
1474                         release_region(addr + idx * info->io.regspacing,
1475                                        info->io.regsize);
1476         }
1477 }
1478 
1479 static int port_setup(struct smi_info *info)
1480 {
1481         unsigned int addr = info->io.addr_data;
1482         int          idx;
1483 
1484         if (!addr)
1485                 return -ENODEV;
1486 
1487         info->io_cleanup = port_cleanup;
1488 
1489         /*
1490          * Figure out the actual inb/inw/inl/etc routine to use based
1491          * upon the register size.
1492          */
1493         switch (info->io.regsize) {
1494         case 1:
1495                 info->io.inputb = port_inb;
1496                 info->io.outputb = port_outb;
1497                 break;
1498         case 2:
1499                 info->io.inputb = port_inw;
1500                 info->io.outputb = port_outw;
1501                 break;
1502         case 4:
1503                 info->io.inputb = port_inl;
1504                 info->io.outputb = port_outl;
1505                 break;
1506         default:
1507                 dev_warn(info->dev, "Invalid register size: %d\n",
1508                          info->io.regsize);
1509                 return -EINVAL;
1510         }
1511 
1512         /*
1513          * Some BIOSes reserve disjoint I/O regions in their ACPI
1514          * tables.  This causes problems when trying to register the
1515          * entire I/O region.  Therefore we must register each I/O
1516          * port separately.
1517          */
1518         for (idx = 0; idx < info->io_size; idx++) {
1519                 if (request_region(addr + idx * info->io.regspacing,
1520                                    info->io.regsize, DEVICE_NAME) == NULL) {
1521                         /* Undo allocations */
1522                         while (idx--) {
1523                                 release_region(addr + idx * info->io.regspacing,
1524                                                info->io.regsize);
1525                         }
1526                         return -EIO;
1527                 }
1528         }
1529         return 0;
1530 }
1531 
1532 static unsigned char intf_mem_inb(struct si_sm_io *io, unsigned int offset)
1533 {
1534         return readb((io->addr)+(offset * io->regspacing));
1535 }
1536 
1537 static void intf_mem_outb(struct si_sm_io *io, unsigned int offset,
1538                      unsigned char b)
1539 {
1540         writeb(b, (io->addr)+(offset * io->regspacing));
1541 }
1542 
1543 static unsigned char intf_mem_inw(struct si_sm_io *io, unsigned int offset)
1544 {
1545         return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)
1546                 & 0xff;
1547 }
1548 
1549 static void intf_mem_outw(struct si_sm_io *io, unsigned int offset,
1550                      unsigned char b)
1551 {
1552         writeb(b << io->regshift, (io->addr)+(offset * io->regspacing));
1553 }
1554 
1555 static unsigned char intf_mem_inl(struct si_sm_io *io, unsigned int offset)
1556 {
1557         return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)
1558                 & 0xff;
1559 }
1560 
1561 static void intf_mem_outl(struct si_sm_io *io, unsigned int offset,
1562                      unsigned char b)
1563 {
1564         writel(b << io->regshift, (io->addr)+(offset * io->regspacing));
1565 }
1566 
1567 #ifdef readq
1568 static unsigned char mem_inq(struct si_sm_io *io, unsigned int offset)
1569 {
1570         return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)
1571                 & 0xff;
1572 }
1573 
1574 static void mem_outq(struct si_sm_io *io, unsigned int offset,
1575                      unsigned char b)
1576 {
1577         writeq(b << io->regshift, (io->addr)+(offset * io->regspacing));
1578 }
1579 #endif
1580 
1581 static void mem_cleanup(struct smi_info *info)
1582 {
1583         unsigned long addr = info->io.addr_data;
1584         int           mapsize;
1585 
1586         if (info->io.addr) {
1587                 iounmap(info->io.addr);
1588 
1589                 mapsize = ((info->io_size * info->io.regspacing)
1590                            - (info->io.regspacing - info->io.regsize));
1591 
1592                 release_mem_region(addr, mapsize);
1593         }
1594 }
1595 
1596 static int mem_setup(struct smi_info *info)
1597 {
1598         unsigned long addr = info->io.addr_data;
1599         int           mapsize;
1600 
1601         if (!addr)
1602                 return -ENODEV;
1603 
1604         info->io_cleanup = mem_cleanup;
1605 
1606         /*
1607          * Figure out the actual readb/readw/readl/etc routine to use based
1608          * upon the register size.
1609          */
1610         switch (info->io.regsize) {
1611         case 1:
1612                 info->io.inputb = intf_mem_inb;
1613                 info->io.outputb = intf_mem_outb;
1614                 break;
1615         case 2:
1616                 info->io.inputb = intf_mem_inw;
1617                 info->io.outputb = intf_mem_outw;
1618                 break;
1619         case 4:
1620                 info->io.inputb = intf_mem_inl;
1621                 info->io.outputb = intf_mem_outl;
1622                 break;
1623 #ifdef readq
1624         case 8:
1625                 info->io.inputb = mem_inq;
1626                 info->io.outputb = mem_outq;
1627                 break;
1628 #endif
1629         default:
1630                 dev_warn(info->dev, "Invalid register size: %d\n",
1631                          info->io.regsize);
1632                 return -EINVAL;
1633         }
1634 
1635         /*
1636          * Calculate the total amount of memory to claim.  This is an
1637          * unusual looking calculation, but it avoids claiming any
1638          * more memory than it has to.  It will claim everything
1639          * between the first address to the end of the last full
1640          * register.
1641          */
1642         mapsize = ((info->io_size * info->io.regspacing)
1643                    - (info->io.regspacing - info->io.regsize));
1644 
1645         if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL)
1646                 return -EIO;
1647 
1648         info->io.addr = ioremap(addr, mapsize);
1649         if (info->io.addr == NULL) {
1650                 release_mem_region(addr, mapsize);
1651                 return -EIO;
1652         }
1653         return 0;
1654 }
1655 
1656 /*
1657  * Parms come in as <op1>[:op2[:op3...]].  ops are:
1658  *   add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
1659  * Options are:
1660  *   rsp=<regspacing>
1661  *   rsi=<regsize>
1662  *   rsh=<regshift>
1663  *   irq=<irq>
1664  *   ipmb=<ipmb addr>
1665  */
1666 enum hotmod_op { HM_ADD, HM_REMOVE };
1667 struct hotmod_vals {
1668         char *name;
1669         int  val;
1670 };
1671 static struct hotmod_vals hotmod_ops[] = {
1672         { "add",        HM_ADD },
1673         { "remove",     HM_REMOVE },
1674         { NULL }
1675 };
1676 static struct hotmod_vals hotmod_si[] = {
1677         { "kcs",        SI_KCS },
1678         { "smic",       SI_SMIC },
1679         { "bt",         SI_BT },
1680         { NULL }
1681 };
1682 static struct hotmod_vals hotmod_as[] = {
1683         { "mem",        IPMI_MEM_ADDR_SPACE },
1684         { "i/o",        IPMI_IO_ADDR_SPACE },
1685         { NULL }
1686 };
1687 
1688 static int parse_str(struct hotmod_vals *v, int *val, char *name, char **curr)
1689 {
1690         char *s;
1691         int  i;
1692 
1693         s = strchr(*curr, ',');
1694         if (!s) {
1695                 printk(KERN_WARNING PFX "No hotmod %s given.\n", name);
1696                 return -EINVAL;
1697         }
1698         *s = '\0';
1699         s++;
1700         for (i = 0; hotmod_ops[i].name; i++) {
1701                 if (strcmp(*curr, v[i].name) == 0) {
1702                         *val = v[i].val;
1703                         *curr = s;
1704                         return 0;
1705                 }
1706         }
1707 
1708         printk(KERN_WARNING PFX "Invalid hotmod %s '%s'\n", name, *curr);
1709         return -EINVAL;
1710 }
1711 
1712 static int check_hotmod_int_op(const char *curr, const char *option,
1713                                const char *name, int *val)
1714 {
1715         char *n;
1716 
1717         if (strcmp(curr, name) == 0) {
1718                 if (!option) {
1719                         printk(KERN_WARNING PFX
1720                                "No option given for '%s'\n",
1721                                curr);
1722                         return -EINVAL;
1723                 }
1724                 *val = simple_strtoul(option, &n, 0);
1725                 if ((*n != '\0') || (*option == '\0')) {
1726                         printk(KERN_WARNING PFX
1727                                "Bad option given for '%s'\n",
1728                                curr);
1729                         return -EINVAL;
1730                 }
1731                 return 1;
1732         }
1733         return 0;
1734 }
1735 
1736 static struct smi_info *smi_info_alloc(void)
1737 {
1738         struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
1739 
1740         if (info)
1741                 spin_lock_init(&info->si_lock);
1742         return info;
1743 }
1744 
1745 static int hotmod_handler(const char *val, struct kernel_param *kp)
1746 {
1747         char *str = kstrdup(val, GFP_KERNEL);
1748         int  rv;
1749         char *next, *curr, *s, *n, *o;
1750         enum hotmod_op op;
1751         enum si_type si_type;
1752         int  addr_space;
1753         unsigned long addr;
1754         int regspacing;
1755         int regsize;
1756         int regshift;
1757         int irq;
1758         int ipmb;
1759         int ival;
1760         int len;
1761         struct smi_info *info;
1762 
1763         if (!str)
1764                 return -ENOMEM;
1765 
1766         /* Kill any trailing spaces, as we can get a "\n" from echo. */
1767         len = strlen(str);
1768         ival = len - 1;
1769         while ((ival >= 0) && isspace(str[ival])) {
1770                 str[ival] = '\0';
1771                 ival--;
1772         }
1773 
1774         for (curr = str; curr; curr = next) {
1775                 regspacing = 1;
1776                 regsize = 1;
1777                 regshift = 0;
1778                 irq = 0;
1779                 ipmb = 0; /* Choose the default if not specified */
1780 
1781                 next = strchr(curr, ':');
1782                 if (next) {
1783                         *next = '\0';
1784                         next++;
1785                 }
1786 
1787                 rv = parse_str(hotmod_ops, &ival, "operation", &curr);
1788                 if (rv)
1789                         break;
1790                 op = ival;
1791 
1792                 rv = parse_str(hotmod_si, &ival, "interface type", &curr);
1793                 if (rv)
1794                         break;
1795                 si_type = ival;
1796 
1797                 rv = parse_str(hotmod_as, &addr_space, "address space", &curr);
1798                 if (rv)
1799                         break;
1800 
1801                 s = strchr(curr, ',');
1802                 if (s) {
1803                         *s = '\0';
1804                         s++;
1805                 }
1806                 addr = simple_strtoul(curr, &n, 0);
1807                 if ((*n != '\0') || (*curr == '\0')) {
1808                         printk(KERN_WARNING PFX "Invalid hotmod address"
1809                                " '%s'\n", curr);
1810                         break;
1811                 }
1812 
1813                 while (s) {
1814                         curr = s;
1815                         s = strchr(curr, ',');
1816                         if (s) {
1817                                 *s = '\0';
1818                                 s++;
1819                         }
1820                         o = strchr(curr, '=');
1821                         if (o) {
1822                                 *o = '\0';
1823                                 o++;
1824                         }
1825                         rv = check_hotmod_int_op(curr, o, "rsp", &regspacing);
1826                         if (rv < 0)
1827                                 goto out;
1828                         else if (rv)
1829                                 continue;
1830                         rv = check_hotmod_int_op(curr, o, "rsi", &regsize);
1831                         if (rv < 0)
1832                                 goto out;
1833                         else if (rv)
1834                                 continue;
1835                         rv = check_hotmod_int_op(curr, o, "rsh", &regshift);
1836                         if (rv < 0)
1837                                 goto out;
1838                         else if (rv)
1839                                 continue;
1840                         rv = check_hotmod_int_op(curr, o, "irq", &irq);
1841                         if (rv < 0)
1842                                 goto out;
1843                         else if (rv)
1844                                 continue;
1845                         rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb);
1846                         if (rv < 0)
1847                                 goto out;
1848                         else if (rv)
1849                                 continue;
1850 
1851                         rv = -EINVAL;
1852                         printk(KERN_WARNING PFX
1853                                "Invalid hotmod option '%s'\n",
1854                                curr);
1855                         goto out;
1856                 }
1857 
1858                 if (op == HM_ADD) {
1859                         info = smi_info_alloc();
1860                         if (!info) {
1861                                 rv = -ENOMEM;
1862                                 goto out;
1863                         }
1864 
1865                         info->addr_source = SI_HOTMOD;
1866                         info->si_type = si_type;
1867                         info->io.addr_data = addr;
1868                         info->io.addr_type = addr_space;
1869                         if (addr_space == IPMI_MEM_ADDR_SPACE)
1870                                 info->io_setup = mem_setup;
1871                         else
1872                                 info->io_setup = port_setup;
1873 
1874                         info->io.addr = NULL;
1875                         info->io.regspacing = regspacing;
1876                         if (!info->io.regspacing)
1877                                 info->io.regspacing = DEFAULT_REGSPACING;
1878                         info->io.regsize = regsize;
1879                         if (!info->io.regsize)
1880                                 info->io.regsize = DEFAULT_REGSPACING;
1881                         info->io.regshift = regshift;
1882                         info->irq = irq;
1883                         if (info->irq)
1884                                 info->irq_setup = std_irq_setup;
1885                         info->slave_addr = ipmb;
1886 
1887                         rv = add_smi(info);
1888                         if (rv) {
1889                                 kfree(info);
1890                                 goto out;
1891                         }
1892                         rv = try_smi_init(info);
1893                         if (rv) {
1894                                 cleanup_one_si(info);
1895                                 goto out;
1896                         }
1897                 } else {
1898                         /* remove */
1899                         struct smi_info *e, *tmp_e;
1900 
1901                         mutex_lock(&smi_infos_lock);
1902                         list_for_each_entry_safe(e, tmp_e, &smi_infos, link) {
1903                                 if (e->io.addr_type != addr_space)
1904                                         continue;
1905                                 if (e->si_type != si_type)
1906                                         continue;
1907                                 if (e->io.addr_data == addr)
1908                                         cleanup_one_si(e);
1909                         }
1910                         mutex_unlock(&smi_infos_lock);
1911                 }
1912         }
1913         rv = len;
1914  out:
1915         kfree(str);
1916         return rv;
1917 }
1918 
1919 static int hardcode_find_bmc(void)
1920 {
1921         int ret = -ENODEV;
1922         int             i;
1923         struct smi_info *info;
1924 
1925         for (i = 0; i < SI_MAX_PARMS; i++) {
1926                 if (!ports[i] && !addrs[i])
1927                         continue;
1928 
1929                 info = smi_info_alloc();
1930                 if (!info)
1931                         return -ENOMEM;
1932 
1933                 info->addr_source = SI_HARDCODED;
1934                 printk(KERN_INFO PFX "probing via hardcoded address\n");
1935 
1936                 if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) {
1937                         info->si_type = SI_KCS;
1938                 } else if (strcmp(si_type[i], "smic") == 0) {
1939                         info->si_type = SI_SMIC;
1940                 } else if (strcmp(si_type[i], "bt") == 0) {
1941                         info->si_type = SI_BT;
1942                 } else {
1943                         printk(KERN_WARNING PFX "Interface type specified "
1944                                "for interface %d, was invalid: %s\n",
1945                                i, si_type[i]);
1946                         kfree(info);
1947                         continue;
1948                 }
1949 
1950                 if (ports[i]) {
1951                         /* An I/O port */
1952                         info->io_setup = port_setup;
1953                         info->io.addr_data = ports[i];
1954                         info->io.addr_type = IPMI_IO_ADDR_SPACE;
1955                 } else if (addrs[i]) {
1956                         /* A memory port */
1957                         info->io_setup = mem_setup;
1958                         info->io.addr_data = addrs[i];
1959                         info->io.addr_type = IPMI_MEM_ADDR_SPACE;
1960                 } else {
1961                         printk(KERN_WARNING PFX "Interface type specified "
1962                                "for interface %d, but port and address were "
1963                                "not set or set to zero.\n", i);
1964                         kfree(info);
1965                         continue;
1966                 }
1967 
1968                 info->io.addr = NULL;
1969                 info->io.regspacing = regspacings[i];
1970                 if (!info->io.regspacing)
1971                         info->io.regspacing = DEFAULT_REGSPACING;
1972                 info->io.regsize = regsizes[i];
1973                 if (!info->io.regsize)
1974                         info->io.regsize = DEFAULT_REGSPACING;
1975                 info->io.regshift = regshifts[i];
1976                 info->irq = irqs[i];
1977                 if (info->irq)
1978                         info->irq_setup = std_irq_setup;
1979                 info->slave_addr = slave_addrs[i];
1980 
1981                 if (!add_smi(info)) {
1982                         if (try_smi_init(info))
1983                                 cleanup_one_si(info);
1984                         ret = 0;
1985                 } else {
1986                         kfree(info);
1987                 }
1988         }
1989         return ret;
1990 }
1991 
1992 #ifdef CONFIG_ACPI
1993 
1994 #include <linux/acpi.h>
1995 
1996 /*
1997  * Once we get an ACPI failure, we don't try any more, because we go
1998  * through the tables sequentially.  Once we don't find a table, there
1999  * are no more.
2000  */
2001 static int acpi_failure;
2002 
2003 /* For GPE-type interrupts. */
2004 static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
2005         u32 gpe_number, void *context)
2006 {
2007         struct smi_info *smi_info = context;
2008         unsigned long   flags;
2009 #ifdef DEBUG_TIMING
2010         struct timeval t;
2011 #endif
2012 
2013         spin_lock_irqsave(&(smi_info->si_lock), flags);
2014 
2015         smi_inc_stat(smi_info, interrupts);
2016 
2017 #ifdef DEBUG_TIMING
2018         do_gettimeofday(&t);
2019         printk("**ACPI_GPE: %d.%9.9d\n", t.tv_sec, t.tv_usec);
2020 #endif
2021         smi_event_handler(smi_info, 0);
2022         spin_unlock_irqrestore(&(smi_info->si_lock), flags);
2023 
2024         return ACPI_INTERRUPT_HANDLED;
2025 }
2026 
2027 static void acpi_gpe_irq_cleanup(struct smi_info *info)
2028 {
2029         if (!info->irq)
2030                 return;
2031 
2032         acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe);
2033 }
2034 
2035 static int acpi_gpe_irq_setup(struct smi_info *info)
2036 {
2037         acpi_status status;
2038 
2039         if (!info->irq)
2040                 return 0;
2041 
2042         /* FIXME - is level triggered right? */
2043         status = acpi_install_gpe_handler(NULL,
2044                                           info->irq,
2045                                           ACPI_GPE_LEVEL_TRIGGERED,
2046                                           &ipmi_acpi_gpe,
2047                                           info);
2048         if (status != AE_OK) {
2049                 dev_warn(info->dev, "%s unable to claim ACPI GPE %d,"
2050                          " running polled\n", DEVICE_NAME, info->irq);
2051                 info->irq = 0;
2052                 return -EINVAL;
2053         } else {
2054                 info->irq_cleanup = acpi_gpe_irq_cleanup;
2055                 dev_info(info->dev, "Using ACPI GPE %d\n", info->irq);
2056                 return 0;
2057         }
2058 }
2059 
2060 /*
2061  * Defined at
2062  * http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf
2063  */
2064 struct SPMITable {
2065         s8      Signature[4];
2066         u32     Length;
2067         u8      Revision;
2068         u8      Checksum;
2069         s8      OEMID[6];
2070         s8      OEMTableID[8];
2071         s8      OEMRevision[4];
2072         s8      CreatorID[4];
2073         s8      CreatorRevision[4];
2074         u8      InterfaceType;
2075         u8      IPMIlegacy;
2076         s16     SpecificationRevision;
2077 
2078         /*
2079          * Bit 0 - SCI interrupt supported
2080          * Bit 1 - I/O APIC/SAPIC
2081          */
2082         u8      InterruptType;
2083 
2084         /*
2085          * If bit 0 of InterruptType is set, then this is the SCI
2086          * interrupt in the GPEx_STS register.
2087          */
2088         u8      GPE;
2089 
2090         s16     Reserved;
2091 
2092         /*
2093          * If bit 1 of InterruptType is set, then this is the I/O
2094          * APIC/SAPIC interrupt.
2095          */
2096         u32     GlobalSystemInterrupt;
2097 
2098         /* The actual register address. */
2099         struct acpi_generic_address addr;
2100 
2101         u8      UID[4];
2102 
2103         s8      spmi_id[1]; /* A '\0' terminated array starts here. */
2104 };
2105 
2106 static int try_init_spmi(struct SPMITable *spmi)
2107 {
2108         struct smi_info  *info;
2109         int rv;
2110 
2111         if (spmi->IPMIlegacy != 1) {
2112                 printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy);
2113                 return -ENODEV;
2114         }
2115 
2116         info = smi_info_alloc();
2117         if (!info) {
2118                 printk(KERN_ERR PFX "Could not allocate SI data (3)\n");
2119                 return -ENOMEM;
2120         }
2121 
2122         info->addr_source = SI_SPMI;
2123         printk(KERN_INFO PFX "probing via SPMI\n");
2124 
2125         /* Figure out the interface type. */
2126         switch (spmi->InterfaceType) {
2127         case 1: /* KCS */
2128                 info->si_type = SI_KCS;
2129                 break;
2130         case 2: /* SMIC */
2131                 info->si_type = SI_SMIC;
2132                 break;
2133         case 3: /* BT */
2134                 info->si_type = SI_BT;
2135                 break;
2136         default:
2137                 printk(KERN_INFO PFX "Unknown ACPI/SPMI SI type %d\n",
2138                        spmi->InterfaceType);
2139                 kfree(info);
2140                 return -EIO;
2141         }
2142 
2143         if (spmi->InterruptType & 1) {
2144                 /* We've got a GPE interrupt. */
2145                 info->irq = spmi->GPE;
2146                 info->irq_setup = acpi_gpe_irq_setup;
2147         } else if (spmi->InterruptType & 2) {
2148                 /* We've got an APIC/SAPIC interrupt. */
2149                 info->irq = spmi->GlobalSystemInterrupt;
2150                 info->irq_setup = std_irq_setup;
2151         } else {
2152                 /* Use the default interrupt setting. */
2153                 info->irq = 0;
2154                 info->irq_setup = NULL;
2155         }
2156 
2157         if (spmi->addr.bit_width) {
2158                 /* A (hopefully) properly formed register bit width. */
2159                 info->io.regspacing = spmi->addr.bit_width / 8;
2160         } else {
2161                 info->io.regspacing = DEFAULT_REGSPACING;
2162         }
2163         info->io.regsize = info->io.regspacing;
2164         info->io.regshift = spmi->addr.bit_offset;
2165 
2166         if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
2167                 info->io_setup = mem_setup;
2168                 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2169         } else if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
2170                 info->io_setup = port_setup;
2171                 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2172         } else {
2173                 kfree(info);
2174                 printk(KERN_WARNING PFX "Unknown ACPI I/O Address type\n");
2175                 return -EIO;
2176         }
2177         info->io.addr_data = spmi->addr.address;
2178 
2179         pr_info("ipmi_si: SPMI: %s %#lx regsize %d spacing %d irq %d\n",
2180                  (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2181                  info->io.addr_data, info->io.regsize, info->io.regspacing,
2182                  info->irq);
2183 
2184         rv = add_smi(info);
2185         if (rv)
2186                 kfree(info);
2187 
2188         return rv;
2189 }
2190 
2191 static void spmi_find_bmc(void)
2192 {
2193         acpi_status      status;
2194         struct SPMITable *spmi;
2195         int              i;
2196 
2197         if (acpi_disabled)
2198                 return;
2199 
2200         if (acpi_failure)
2201                 return;
2202 
2203         for (i = 0; ; i++) {
2204                 status = acpi_get_table(ACPI_SIG_SPMI, i+1,
2205                                         (struct acpi_table_header **)&spmi);
2206                 if (status != AE_OK)
2207                         return;
2208 
2209                 try_init_spmi(spmi);
2210         }
2211 }
2212 
2213 static int ipmi_pnp_probe(struct pnp_dev *dev,
2214                                     const struct pnp_device_id *dev_id)
2215 {
2216         struct acpi_device *acpi_dev;
2217         struct smi_info *info;
2218         struct resource *res, *res_second;
2219         acpi_handle handle;
2220         acpi_status status;
2221         unsigned long long tmp;
2222         int rv;
2223 
2224         acpi_dev = pnp_acpi_device(dev);
2225         if (!acpi_dev)
2226                 return -ENODEV;
2227 
2228         info = smi_info_alloc();
2229         if (!info)
2230                 return -ENOMEM;
2231 
2232         info->addr_source = SI_ACPI;
2233         printk(KERN_INFO PFX "probing via ACPI\n");
2234 
2235         handle = acpi_dev->handle;
2236         info->addr_info.acpi_info.acpi_handle = handle;
2237 
2238         /* _IFT tells us the interface type: KCS, BT, etc */
2239         status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
2240         if (ACPI_FAILURE(status))
2241                 goto err_free;
2242 
2243         switch (tmp) {
2244         case 1:
2245                 info->si_type = SI_KCS;
2246                 break;
2247         case 2:
2248                 info->si_type = SI_SMIC;
2249                 break;
2250         case 3:
2251                 info->si_type = SI_BT;
2252                 break;
2253         default:
2254                 dev_info(&dev->dev, "unknown IPMI type %lld\n", tmp);
2255                 goto err_free;
2256         }
2257 
2258         res = pnp_get_resource(dev, IORESOURCE_IO, 0);
2259         if (res) {
2260                 info->io_setup = port_setup;
2261                 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2262         } else {
2263                 res = pnp_get_resource(dev, IORESOURCE_MEM, 0);
2264                 if (res) {
2265                         info->io_setup = mem_setup;
2266                         info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2267                 }
2268         }
2269         if (!res) {
2270                 dev_err(&dev->dev, "no I/O or memory address\n");
2271                 goto err_free;
2272         }
2273         info->io.addr_data = res->start;
2274 
2275         info->io.regspacing = DEFAULT_REGSPACING;
2276         res_second = pnp_get_resource(dev,
2277                                (info->io.addr_type == IPMI_IO_ADDR_SPACE) ?
2278                                         IORESOURCE_IO : IORESOURCE_MEM,
2279                                1);
2280         if (res_second) {
2281                 if (res_second->start > info->io.addr_data)
2282                         info->io.regspacing = res_second->start - info->io.addr_data;
2283         }
2284         info->io.regsize = DEFAULT_REGSPACING;
2285         info->io.regshift = 0;
2286 
2287         /* If _GPE exists, use it; otherwise use standard interrupts */
2288         status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
2289         if (ACPI_SUCCESS(status)) {
2290                 info->irq = tmp;
2291                 info->irq_setup = acpi_gpe_irq_setup;
2292         } else if (pnp_irq_valid(dev, 0)) {
2293                 info->irq = pnp_irq(dev, 0);
2294                 info->irq_setup = std_irq_setup;
2295         }
2296 
2297         info->dev = &dev->dev;
2298         pnp_set_drvdata(dev, info);
2299 
2300         dev_info(info->dev, "%pR regsize %d spacing %d irq %d\n",
2301                  res, info->io.regsize, info->io.regspacing,
2302                  info->irq);
2303 
2304         rv = add_smi(info);
2305         if (rv)
2306                 kfree(info);
2307 
2308         return rv;
2309 
2310 err_free:
2311         kfree(info);
2312         return -EINVAL;
2313 }
2314 
2315 static void ipmi_pnp_remove(struct pnp_dev *dev)
2316 {
2317         struct smi_info *info = pnp_get_drvdata(dev);
2318 
2319         cleanup_one_si(info);
2320 }
2321 
2322 static const struct pnp_device_id pnp_dev_table[] = {
2323         {"IPI0001", 0},
2324         {"", 0},
2325 };
2326 
2327 static struct pnp_driver ipmi_pnp_driver = {
2328         .name           = DEVICE_NAME,
2329         .probe          = ipmi_pnp_probe,
2330         .remove         = ipmi_pnp_remove,
2331         .id_table       = pnp_dev_table,
2332 };
2333 
2334 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
2335 #endif
2336 
2337 #ifdef CONFIG_DMI
2338 struct dmi_ipmi_data {
2339         u8              type;
2340         u8              addr_space;
2341         unsigned long   base_addr;
2342         u8              irq;
2343         u8              offset;
2344         u8              slave_addr;
2345 };
2346 
2347 static int decode_dmi(const struct dmi_header *dm,
2348                                 struct dmi_ipmi_data *dmi)
2349 {
2350         const u8        *data = (const u8 *)dm;
2351         unsigned long   base_addr;
2352         u8              reg_spacing;
2353         u8              len = dm->length;
2354 
2355         dmi->type = data[4];
2356 
2357         memcpy(&base_addr, data+8, sizeof(unsigned long));
2358         if (len >= 0x11) {
2359                 if (base_addr & 1) {
2360                         /* I/O */
2361                         base_addr &= 0xFFFE;
2362                         dmi->addr_space = IPMI_IO_ADDR_SPACE;
2363                 } else
2364                         /* Memory */
2365                         dmi->addr_space = IPMI_MEM_ADDR_SPACE;
2366 
2367                 /* If bit 4 of byte 0x10 is set, then the lsb for the address
2368                    is odd. */
2369                 dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
2370 
2371                 dmi->irq = data[0x11];
2372 
2373                 /* The top two bits of byte 0x10 hold the register spacing. */
2374                 reg_spacing = (data[0x10] & 0xC0) >> 6;
2375                 switch (reg_spacing) {
2376                 case 0x00: /* Byte boundaries */
2377                     dmi->offset = 1;
2378                     break;
2379                 case 0x01: /* 32-bit boundaries */
2380                     dmi->offset = 4;
2381                     break;
2382                 case 0x02: /* 16-byte boundaries */
2383                     dmi->offset = 16;
2384                     break;
2385                 default:
2386                     /* Some other interface, just ignore it. */
2387                     return -EIO;
2388                 }
2389         } else {
2390                 /* Old DMI spec. */
2391                 /*
2392                  * Note that technically, the lower bit of the base
2393                  * address should be 1 if the address is I/O and 0 if
2394                  * the address is in memory.  So many systems get that
2395                  * wrong (and all that I have seen are I/O) so we just
2396                  * ignore that bit and assume I/O.  Systems that use
2397                  * memory should use the newer spec, anyway.
2398                  */
2399                 dmi->base_addr = base_addr & 0xfffe;
2400                 dmi->addr_space = IPMI_IO_ADDR_SPACE;
2401                 dmi->offset = 1;
2402         }
2403 
2404         dmi->slave_addr = data[6];
2405 
2406         return 0;
2407 }
2408 
2409 static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
2410 {
2411         struct smi_info *info;
2412 
2413         info = smi_info_alloc();
2414         if (!info) {
2415                 printk(KERN_ERR PFX "Could not allocate SI data\n");
2416                 return;
2417         }
2418 
2419         info->addr_source = SI_SMBIOS;
2420         printk(KERN_INFO PFX "probing via SMBIOS\n");
2421 
2422         switch (ipmi_data->type) {
2423         case 0x01: /* KCS */
2424                 info->si_type = SI_KCS;
2425                 break;
2426         case 0x02: /* SMIC */
2427                 info->si_type = SI_SMIC;
2428                 break;
2429         case 0x03: /* BT */
2430                 info->si_type = SI_BT;
2431                 break;
2432         default:
2433                 kfree(info);
2434                 return;
2435         }
2436 
2437         switch (ipmi_data->addr_space) {
2438         case IPMI_MEM_ADDR_SPACE:
2439                 info->io_setup = mem_setup;
2440                 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2441                 break;
2442 
2443         case IPMI_IO_ADDR_SPACE:
2444                 info->io_setup = port_setup;
2445                 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2446                 break;
2447 
2448         default:
2449                 kfree(info);
2450                 printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n",
2451                        ipmi_data->addr_space);
2452                 return;
2453         }
2454         info->io.addr_data = ipmi_data->base_addr;
2455 
2456         info->io.regspacing = ipmi_data->offset;
2457         if (!info->io.regspacing)
2458                 info->io.regspacing = DEFAULT_REGSPACING;
2459         info->io.regsize = DEFAULT_REGSPACING;
2460         info->io.regshift = 0;
2461 
2462         info->slave_addr = ipmi_data->slave_addr;
2463 
2464         info->irq = ipmi_data->irq;
2465         if (info->irq)
2466                 info->irq_setup = std_irq_setup;
2467 
2468         pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n",
2469                  (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2470                  info->io.addr_data, info->io.regsize, info->io.regspacing,
2471                  info->irq);
2472 
2473         if (add_smi(info))
2474                 kfree(info);
2475 }
2476 
2477 static void dmi_find_bmc(void)
2478 {
2479         const struct dmi_device *dev = NULL;
2480         struct dmi_ipmi_data data;
2481         int                  rv;
2482 
2483         while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) {
2484                 memset(&data, 0, sizeof(data));
2485                 rv = decode_dmi((const struct dmi_header *) dev->device_data,
2486                                 &data);
2487                 if (!rv)
2488                         try_init_dmi(&data);
2489         }
2490 }
2491 #endif /* CONFIG_DMI */
2492 
2493 #ifdef CONFIG_PCI
2494 
2495 #define PCI_ERMC_CLASSCODE              0x0C0700
2496 #define PCI_ERMC_CLASSCODE_MASK         0xffffff00
2497 #define PCI_ERMC_CLASSCODE_TYPE_MASK    0xff
2498 #define PCI_ERMC_CLASSCODE_TYPE_SMIC    0x00
2499 #define PCI_ERMC_CLASSCODE_TYPE_KCS     0x01
2500 #define PCI_ERMC_CLASSCODE_TYPE_BT      0x02
2501 
2502 #define PCI_HP_VENDOR_ID    0x103C
2503 #define PCI_MMC_DEVICE_ID   0x121A
2504 #define PCI_MMC_ADDR_CW     0x10
2505 
2506 static void ipmi_pci_cleanup(struct smi_info *info)
2507 {
2508         struct pci_dev *pdev = info->addr_source_data;
2509 
2510         pci_disable_device(pdev);
2511 }
2512 
2513 static int ipmi_pci_probe_regspacing(struct smi_info *info)
2514 {
2515         if (info->si_type == SI_KCS) {
2516                 unsigned char   status;
2517                 int             regspacing;
2518 
2519                 info->io.regsize = DEFAULT_REGSIZE;
2520                 info->io.regshift = 0;
2521                 info->io_size = 2;
2522                 info->handlers = &kcs_smi_handlers;
2523 
2524                 /* detect 1, 4, 16byte spacing */
2525                 for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
2526                         info->io.regspacing = regspacing;
2527                         if (info->io_setup(info)) {
2528                                 dev_err(info->dev,
2529                                         "Could not setup I/O space\n");
2530                                 return DEFAULT_REGSPACING;
2531                         }
2532                         /* write invalid cmd */
2533                         info->io.outputb(&info->io, 1, 0x10);
2534                         /* read status back */
2535                         status = info->io.inputb(&info->io, 1);
2536                         info->io_cleanup(info);
2537                         if (status)
2538                                 return regspacing;
2539                         regspacing *= 4;
2540                 }
2541         }
2542         return DEFAULT_REGSPACING;
2543 }
2544 
2545 static int ipmi_pci_probe(struct pci_dev *pdev,
2546                                     const struct pci_device_id *ent)
2547 {
2548         int rv;
2549         int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
2550         struct smi_info *info;
2551 
2552         info = smi_info_alloc();
2553         if (!info)
2554                 return -ENOMEM;
2555 
2556         info->addr_source = SI_PCI;
2557         dev_info(&pdev->dev, "probing via PCI");
2558 
2559         switch (class_type) {
2560         case PCI_ERMC_CLASSCODE_TYPE_SMIC:
2561                 info->si_type = SI_SMIC;
2562                 break;
2563 
2564         case PCI_ERMC_CLASSCODE_TYPE_KCS:
2565                 info->si_type = SI_KCS;
2566                 break;
2567 
2568         case PCI_ERMC_CLASSCODE_TYPE_BT:
2569                 info->si_type = SI_BT;
2570                 break;
2571 
2572         default:
2573                 kfree(info);
2574                 dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type);
2575                 return -ENOMEM;
2576         }
2577 
2578         rv = pci_enable_device(pdev);
2579         if (rv) {
2580                 dev_err(&pdev->dev, "couldn't enable PCI device\n");
2581                 kfree(info);
2582                 return rv;
2583         }
2584 
2585         info->addr_source_cleanup = ipmi_pci_cleanup;
2586         info->addr_source_data = pdev;
2587 
2588         if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
2589                 info->io_setup = port_setup;
2590                 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2591         } else {
2592                 info->io_setup = mem_setup;
2593                 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2594         }
2595         info->io.addr_data = pci_resource_start(pdev, 0);
2596 
2597         info->io.regspacing = ipmi_pci_probe_regspacing(info);
2598         info->io.regsize = DEFAULT_REGSIZE;
2599         info->io.regshift = 0;
2600 
2601         info->irq = pdev->irq;
2602         if (info->irq)
2603                 info->irq_setup = std_irq_setup;
2604 
2605         info->dev = &pdev->dev;
2606         pci_set_drvdata(pdev, info);
2607 
2608         dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
2609                 &pdev->resource[0], info->io.regsize, info->io.regspacing,
2610                 info->irq);
2611 
2612         rv = add_smi(info);
2613         if (rv) {
2614                 kfree(info);
2615                 pci_disable_device(pdev);
2616         }
2617 
2618         return rv;
2619 }
2620 
2621 static void ipmi_pci_remove(struct pci_dev *pdev)
2622 {
2623         struct smi_info *info = pci_get_drvdata(pdev);
2624         cleanup_one_si(info);
2625         pci_disable_device(pdev);
2626 }
2627 
2628 static struct pci_device_id ipmi_pci_devices[] = {
2629         { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) },
2630         { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) },
2631         { 0, }
2632 };
2633 MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);
2634 
2635 static struct pci_driver ipmi_pci_driver = {
2636         .name =         DEVICE_NAME,
2637         .id_table =     ipmi_pci_devices,
2638         .probe =        ipmi_pci_probe,
2639         .remove =       ipmi_pci_remove,
2640 };
2641 #endif /* CONFIG_PCI */
2642 
2643 static struct of_device_id ipmi_match[];
2644 static int ipmi_probe(struct platform_device *dev)
2645 {
2646 #ifdef CONFIG_OF
2647         const struct of_device_id *match;
2648         struct smi_info *info;
2649         struct resource resource;
2650         const __be32 *regsize, *regspacing, *regshift;
2651         struct device_node *np = dev->dev.of_node;
2652         int ret;
2653         int proplen;
2654 
2655         dev_info(&dev->dev, "probing via device tree\n");
2656 
2657         match = of_match_device(ipmi_match, &dev->dev);
2658         if (!match)
2659                 return -EINVAL;
2660 
2661         ret = of_address_to_resource(np, 0, &resource);
2662         if (ret) {
2663                 dev_warn(&dev->dev, PFX "invalid address from OF\n");
2664                 return ret;
2665         }
2666 
2667         regsize = of_get_property(np, "reg-size", &proplen);
2668         if (regsize && proplen != 4) {
2669                 dev_warn(&dev->dev, PFX "invalid regsize from OF\n");
2670                 return -EINVAL;
2671         }
2672 
2673         regspacing = of_get_property(np, "reg-spacing", &proplen);
2674         if (regspacing && proplen != 4) {
2675                 dev_warn(&dev->dev, PFX "invalid regspacing from OF\n");
2676                 return -EINVAL;
2677         }
2678 
2679         regshift = of_get_property(np, "reg-shift", &proplen);
2680         if (regshift && proplen != 4) {
2681                 dev_warn(&dev->dev, PFX "invalid regshift from OF\n");
2682                 return -EINVAL;
2683         }
2684 
2685         info = smi_info_alloc();
2686 
2687         if (!info) {
2688                 dev_err(&dev->dev,
2689                         "could not allocate memory for OF probe\n");
2690                 return -ENOMEM;
2691         }
2692 
2693         info->si_type           = (enum si_type) match->data;
2694         info->addr_source       = SI_DEVICETREE;
2695         info->irq_setup         = std_irq_setup;
2696 
2697         if (resource.flags & IORESOURCE_IO) {
2698                 info->io_setup          = port_setup;
2699                 info->io.addr_type      = IPMI_IO_ADDR_SPACE;
2700         } else {
2701                 info->io_setup          = mem_setup;
2702                 info->io.addr_type      = IPMI_MEM_ADDR_SPACE;
2703         }
2704 
2705         info->io.addr_data      = resource.start;
2706 
2707         info->io.regsize        = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
2708         info->io.regspacing     = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
2709         info->io.regshift       = regshift ? be32_to_cpup(regshift) : 0;
2710 
2711         info->irq               = irq_of_parse_and_map(dev->dev.of_node, 0);
2712         info->dev               = &dev->dev;
2713 
2714         dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
2715                 info->io.addr_data, info->io.regsize, info->io.regspacing,
2716                 info->irq);
2717 
2718         dev_set_drvdata(&dev->dev, info);
2719 
2720         ret = add_smi(info);
2721         if (ret) {
2722                 kfree(info);
2723                 return ret;
2724         }
2725 #endif
2726         return 0;
2727 }
2728 
2729 static int ipmi_remove(struct platform_device *dev)
2730 {
2731 #ifdef CONFIG_OF
2732         cleanup_one_si(dev_get_drvdata(&dev->dev));
2733 #endif
2734         return 0;
2735 }
2736 
2737 static struct of_device_id ipmi_match[] =
2738 {
2739         { .type = "ipmi", .compatible = "ipmi-kcs",
2740           .data = (void *)(unsigned long) SI_KCS },
2741         { .type = "ipmi", .compatible = "ipmi-smic",
2742           .data = (void *)(unsigned long) SI_SMIC },
2743         { .type = "ipmi", .compatible = "ipmi-bt",
2744           .data = (void *)(unsigned long) SI_BT },
2745         {},
2746 };
2747 
2748 static struct platform_driver ipmi_driver = {
2749         .driver = {
2750                 .name = DEVICE_NAME,
2751                 .owner = THIS_MODULE,
2752                 .of_match_table = ipmi_match,
2753         },
2754         .probe          = ipmi_probe,
2755         .remove         = ipmi_remove,
2756 };
2757 
2758 #ifdef CONFIG_PARISC
2759 static int ipmi_parisc_probe(struct parisc_device *dev)
2760 {
2761         struct smi_info *info;
2762         int rv;
2763 
2764         info = smi_info_alloc();
2765 
2766         if (!info) {
2767                 dev_err(&dev->dev,
2768                         "could not allocate memory for PARISC probe\n");
2769                 return -ENOMEM;
2770         }
2771 
2772         info->si_type           = SI_KCS;
2773         info->addr_source       = SI_DEVICETREE;
2774         info->io_setup          = mem_setup;
2775         info->io.addr_type      = IPMI_MEM_ADDR_SPACE;
2776         info->io.addr_data      = dev->hpa.start;
2777         info->io.regsize        = 1;
2778         info->io.regspacing     = 1;
2779         info->io.regshift       = 0;
2780         info->irq               = 0; /* no interrupt */
2781         info->irq_setup         = NULL;
2782         info->dev               = &dev->dev;
2783 
2784         dev_dbg(&dev->dev, "addr 0x%lx\n", info->io.addr_data);
2785 
2786         dev_set_drvdata(&dev->dev, info);
2787 
2788         rv = add_smi(info);
2789         if (rv) {
2790                 kfree(info);
2791                 return rv;
2792         }
2793 
2794         return 0;
2795 }
2796 
2797 static int ipmi_parisc_remove(struct parisc_device *dev)
2798 {
2799         cleanup_one_si(dev_get_drvdata(&dev->dev));
2800         return 0;
2801 }
2802 
2803 static struct parisc_device_id ipmi_parisc_tbl[] = {
2804         { HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 },
2805         { 0, }
2806 };
2807 
2808 static struct parisc_driver ipmi_parisc_driver = {
2809         .name =         "ipmi",
2810         .id_table =     ipmi_parisc_tbl,
2811         .probe =        ipmi_parisc_probe,
2812         .remove =       ipmi_parisc_remove,
2813 };
2814 #endif /* CONFIG_PARISC */
2815 
2816 static int wait_for_msg_done(struct smi_info *smi_info)
2817 {
2818         enum si_sm_result     smi_result;
2819 
2820         smi_result = smi_info->handlers->event(smi_info->si_sm, 0);
2821         for (;;) {
2822                 if (smi_result == SI_SM_CALL_WITH_DELAY ||
2823                     smi_result == SI_SM_CALL_WITH_TICK_DELAY) {
2824                         schedule_timeout_uninterruptible(1);
2825                         smi_result = smi_info->handlers->event(
2826                                 smi_info->si_sm, jiffies_to_usecs(1));
2827                 } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) {
2828                         smi_result = smi_info->handlers->event(
2829                                 smi_info->si_sm, 0);
2830                 } else
2831                         break;
2832         }
2833         if (smi_result == SI_SM_HOSED)
2834                 /*
2835                  * We couldn't get the state machine to run, so whatever's at
2836                  * the port is probably not an IPMI SMI interface.
2837                  */
2838                 return -ENODEV;
2839 
2840         return 0;
2841 }
2842 
2843 static int try_get_dev_id(struct smi_info *smi_info)
2844 {
2845         unsigned char         msg[2];
2846         unsigned char         *resp;
2847         unsigned long         resp_len;
2848         int                   rv = 0;
2849 
2850         resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2851         if (!resp)
2852                 return -ENOMEM;
2853 
2854         /*
2855          * Do a Get Device ID command, since it comes back with some
2856          * useful info.
2857          */
2858         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2859         msg[1] = IPMI_GET_DEVICE_ID_CMD;
2860         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2861 
2862         rv = wait_for_msg_done(smi_info);
2863         if (rv)
2864                 goto out;
2865 
2866         resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2867                                                   resp, IPMI_MAX_MSG_LENGTH);
2868 
2869         /* Check and record info from the get device id, in case we need it. */
2870         rv = ipmi_demangle_device_id(resp, resp_len, &smi_info->device_id);
2871 
2872  out:
2873         kfree(resp);
2874         return rv;
2875 }
2876 
2877 static int try_enable_event_buffer(struct smi_info *smi_info)
2878 {
2879         unsigned char         msg[3];
2880         unsigned char         *resp;
2881         unsigned long         resp_len;
2882         int                   rv = 0;
2883 
2884         resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2885         if (!resp)
2886                 return -ENOMEM;
2887 
2888         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2889         msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
2890         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2891 
2892         rv = wait_for_msg_done(smi_info);
2893         if (rv) {
2894                 printk(KERN_WARNING PFX "Error getting response from get"
2895                        " global enables command, the event buffer is not"
2896                        " enabled.\n");
2897                 goto out;
2898         }
2899 
2900         resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2901                                                   resp, IPMI_MAX_MSG_LENGTH);
2902 
2903         if (resp_len < 4 ||
2904                         resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2905                         resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD   ||
2906                         resp[2] != 0) {
2907                 printk(KERN_WARNING PFX "Invalid return from get global"
2908                        " enables command, cannot enable the event buffer.\n");
2909                 rv = -EINVAL;
2910                 goto out;
2911         }
2912 
2913         if (resp[3] & IPMI_BMC_EVT_MSG_BUFF)
2914                 /* buffer is already enabled, nothing to do. */
2915                 goto out;
2916 
2917         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2918         msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
2919         msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF;
2920         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
2921 
2922         rv = wait_for_msg_done(smi_info);
2923         if (rv) {
2924                 printk(KERN_WARNING PFX "Error getting response from set"
2925                        " global, enables command, the event buffer is not"
2926                        " enabled.\n");
2927                 goto out;
2928         }
2929 
2930         resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2931                                                   resp, IPMI_MAX_MSG_LENGTH);
2932 
2933         if (resp_len < 3 ||
2934                         resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2935                         resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
2936                 printk(KERN_WARNING PFX "Invalid return from get global,"
2937                        "enables command, not enable the event buffer.\n");
2938                 rv = -EINVAL;
2939                 goto out;
2940         }
2941 
2942         if (resp[2] != 0)
2943                 /*
2944                  * An error when setting the event buffer bit means
2945                  * that the event buffer is not supported.
2946                  */
2947                 rv = -ENOENT;
2948  out:
2949         kfree(resp);
2950         return rv;
2951 }
2952 
2953 static int smi_type_proc_show(struct seq_file *m, void *v)
2954 {
2955         struct smi_info *smi = m->private;
2956 
2957         return seq_printf(m, "%s\n", si_to_str[smi->si_type]);
2958 }
2959 
2960 static int smi_type_proc_open(struct inode *inode, struct file *file)
2961 {
2962         return single_open(file, smi_type_proc_show, PDE_DATA(inode));
2963 }
2964 
2965 static const struct file_operations smi_type_proc_ops = {
2966         .open           = smi_type_proc_open,
2967         .read           = seq_read,
2968         .llseek         = seq_lseek,
2969         .release        = single_release,
2970 };
2971 
2972 static int smi_si_stats_proc_show(struct seq_file *m, void *v)
2973 {
2974         struct smi_info *smi = m->private;
2975 
2976         seq_printf(m, "interrupts_enabled:    %d\n",
2977                        smi->irq && !smi->interrupt_disabled);
2978         seq_printf(m, "short_timeouts:        %u\n",
2979                        smi_get_stat(smi, short_timeouts));
2980         seq_printf(m, "long_timeouts:         %u\n",
2981                        smi_get_stat(smi, long_timeouts));
2982         seq_printf(m, "idles:                 %u\n",
2983                        smi_get_stat(smi, idles));
2984         seq_printf(m, "interrupts:            %u\n",
2985                        smi_get_stat(smi, interrupts));
2986         seq_printf(m, "attentions:            %u\n",
2987                        smi_get_stat(smi, attentions));
2988         seq_printf(m, "flag_fetches:          %u\n",
2989                        smi_get_stat(smi, flag_fetches));
2990         seq_printf(m, "hosed_count:           %u\n",
2991                        smi_get_stat(smi, hosed_count));
2992         seq_printf(m, "complete_transactions: %u\n",
2993                        smi_get_stat(smi, complete_transactions));
2994         seq_printf(m, "events:                %u\n",
2995                        smi_get_stat(smi, events));
2996         seq_printf(m, "watchdog_pretimeouts:  %u\n",
2997                        smi_get_stat(smi, watchdog_pretimeouts));
2998         seq_printf(m, "incoming_messages:     %u\n",
2999                        smi_get_stat(smi, incoming_messages));
3000         return 0;
3001 }
3002 
3003 static int smi_si_stats_proc_open(struct inode *inode, struct file *file)
3004 {
3005         return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode));
3006 }
3007 
3008 static const struct file_operations smi_si_stats_proc_ops = {
3009         .open           = smi_si_stats_proc_open,
3010         .read           = seq_read,
3011         .llseek         = seq_lseek,
3012         .release        = single_release,
3013 };
3014 
3015 static int smi_params_proc_show(struct seq_file *m, void *v)
3016 {
3017         struct smi_info *smi = m->private;
3018 
3019         return seq_printf(m,
3020                        "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n",
3021                        si_to_str[smi->si_type],
3022                        addr_space_to_str[smi->io.addr_type],
3023                        smi->io.addr_data,
3024                        smi->io.regspacing,
3025                        smi->io.regsize,
3026                        smi->io.regshift,
3027                        smi->irq,
3028                        smi->slave_addr);
3029 }
3030 
3031 static int smi_params_proc_open(struct inode *inode, struct file *file)
3032 {
3033         return single_open(file, smi_params_proc_show, PDE_DATA(inode));
3034 }
3035 
3036 static const struct file_operations smi_params_proc_ops = {
3037         .open           = smi_params_proc_open,
3038         .read           = seq_read,
3039         .llseek         = seq_lseek,
3040         .release        = single_release,
3041 };
3042 
3043 /*
3044  * oem_data_avail_to_receive_msg_avail
3045  * @info - smi_info structure with msg_flags set
3046  *
3047  * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL
3048  * Returns 1 indicating need to re-run handle_flags().
3049  */
3050 static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info)
3051 {
3052         smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) |
3053                                RECEIVE_MSG_AVAIL);
3054         return 1;
3055 }
3056 
3057 /*
3058  * setup_dell_poweredge_oem_data_handler
3059  * @info - smi_info.device_id must be populated
3060  *
3061  * Systems that match, but have firmware version < 1.40 may assert
3062  * OEM0_DATA_AVAIL on their own, without being told via Set Flags that
3063  * it's safe to do so.  Such systems will de-assert OEM1_DATA_AVAIL
3064  * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags
3065  * as RECEIVE_MSG_AVAIL instead.
3066  *
3067  * As Dell has no plans to release IPMI 1.5 firmware that *ever*
3068  * assert the OEM[012] bits, and if it did, the driver would have to
3069  * change to handle that properly, we don't actually check for the
3070  * firmware version.
3071  * Device ID = 0x20                BMC on PowerEdge 8G servers
3072  * Device Revision = 0x80
3073  * Firmware Revision1 = 0x01       BMC version 1.40
3074  * Firmware Revision2 = 0x40       BCD encoded
3075  * IPMI Version = 0x51             IPMI 1.5
3076  * Manufacturer ID = A2 02 00      Dell IANA
3077  *
3078  * Additionally, PowerEdge systems with IPMI < 1.5 may also assert
3079  * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL.
3080  *
3081  */
3082 #define DELL_POWEREDGE_8G_BMC_DEVICE_ID  0x20
3083 #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80
3084 #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51
3085 #define DELL_IANA_MFR_ID 0x0002a2
3086 static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info)
3087 {
3088         struct ipmi_device_id *id = &smi_info->device_id;
3089         if (id->manufacturer_id == DELL_IANA_MFR_ID) {
3090                 if (id->device_id       == DELL_POWEREDGE_8G_BMC_DEVICE_ID  &&
3091                     id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV &&
3092                     id->ipmi_version   == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) {
3093                         smi_info->oem_data_avail_handler =
3094                                 oem_data_avail_to_receive_msg_avail;
3095                 } else if (ipmi_version_major(id) < 1 ||
3096                            (ipmi_version_major(id) == 1 &&
3097                             ipmi_version_minor(id) < 5)) {
3098                         smi_info->oem_data_avail_handler =
3099                                 oem_data_avail_to_receive_msg_avail;
3100                 }
3101         }
3102 }
3103 
3104 #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA
3105 static void return_hosed_msg_badsize(struct smi_info *smi_info)
3106 {
3107         struct ipmi_smi_msg *msg = smi_info->curr_msg;
3108 
3109         /* Make it a response */
3110         msg->rsp[0] = msg->data[0] | 4;
3111         msg->rsp[1] = msg->data[1];
3112         msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH;
3113         msg->rsp_size = 3;
3114         smi_info->curr_msg = NULL;
3115         deliver_recv_msg(smi_info, msg);
3116 }
3117 
3118 /*
3119  * dell_poweredge_bt_xaction_handler
3120  * @info - smi_info.device_id must be populated
3121  *
3122  * Dell PowerEdge servers with the BT interface (x6xx and 1750) will
3123  * not respond to a Get SDR command if the length of the data
3124  * requested is exactly 0x3A, which leads to command timeouts and no
3125  * data returned.  This intercepts such commands, and causes userspace
3126  * callers to try again with a different-sized buffer, which succeeds.
3127  */
3128 
3129 #define STORAGE_NETFN 0x0A
3130 #define STORAGE_CMD_GET_SDR 0x23
3131 static int dell_poweredge_bt_xaction_handler(struct notifier_block *self,
3132                                              unsigned long unused,
3133                                              void *in)
3134 {
3135         struct smi_info *smi_info = in;
3136         unsigned char *data = smi_info->curr_msg->data;
3137         unsigned int size   = smi_info->curr_msg->data_size;
3138         if (size >= 8 &&
3139             (data[0]>>2) == STORAGE_NETFN &&
3140             data[1] == STORAGE_CMD_GET_SDR &&
3141             data[7] == 0x3A) {
3142                 return_hosed_msg_badsize(smi_info);
3143                 return NOTIFY_STOP;
3144         }
3145         return NOTIFY_DONE;
3146 }
3147 
3148 static struct notifier_block dell_poweredge_bt_xaction_notifier = {
3149         .notifier_call  = dell_poweredge_bt_xaction_handler,
3150 };
3151 
3152 /*
3153  * setup_dell_poweredge_bt_xaction_handler
3154  * @info - smi_info.device_id must be filled in already
3155  *
3156  * Fills in smi_info.device_id.start_transaction_pre_hook
3157  * when we know what function to use there.
3158  */
3159 static void
3160 setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info)
3161 {
3162         struct ipmi_device_id *id = &smi_info->device_id;
3163         if (id->manufacturer_id == DELL_IANA_MFR_ID &&
3164             smi_info->si_type == SI_BT)
3165                 register_xaction_notifier(&dell_poweredge_bt_xaction_notifier);
3166 }
3167 
3168 /*
3169  * setup_oem_data_handler
3170  * @info - smi_info.device_id must be filled in already
3171  *
3172  * Fills in smi_info.device_id.oem_data_available_handler
3173  * when we know what function to use there.
3174  */
3175 
3176 static void setup_oem_data_handler(struct smi_info *smi_info)
3177 {
3178         setup_dell_poweredge_oem_data_handler(smi_info);
3179 }
3180 
3181 static void setup_xaction_handlers(struct smi_info *smi_info)
3182 {
3183         setup_dell_poweredge_bt_xaction_handler(smi_info);
3184 }
3185 
3186 static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
3187 {
3188         if (smi_info->intf) {
3189                 /*
3190                  * The timer and thread are only running if the
3191                  * interface has been started up and registered.
3192                  */
3193                 if (smi_info->thread != NULL)
3194                         kthread_stop(smi_info->thread);
3195                 del_timer_sync(&smi_info->si_timer);
3196         }
3197 }
3198 
3199 static struct ipmi_default_vals
3200 {
3201         int type;
3202         int port;
3203 } ipmi_defaults[] =
3204 {
3205         { .type = SI_KCS, .port = 0xca2 },
3206         { .type = SI_SMIC, .port = 0xca9 },
3207         { .type = SI_BT, .port = 0xe4 },
3208         { .port = 0 }
3209 };
3210 
3211 static void default_find_bmc(void)
3212 {
3213         struct smi_info *info;
3214         int             i;
3215 
3216         for (i = 0; ; i++) {
3217                 if (!ipmi_defaults[i].port)
3218                         break;
3219 #ifdef CONFIG_PPC
3220                 if (check_legacy_ioport(ipmi_defaults[i].port))
3221                         continue;
3222 #endif
3223                 info = smi_info_alloc();
3224                 if (!info)
3225                         return;
3226 
3227                 info->addr_source = SI_DEFAULT;
3228 
3229                 info->si_type = ipmi_defaults[i].type;
3230                 info->io_setup = port_setup;
3231                 info->io.addr_data = ipmi_defaults[i].port;
3232                 info->io.addr_type = IPMI_IO_ADDR_SPACE;
3233 
3234                 info->io.addr = NULL;
3235                 info->io.regspacing = DEFAULT_REGSPACING;
3236                 info->io.regsize = DEFAULT_REGSPACING;
3237                 info->io.regshift = 0;
3238 
3239                 if (add_smi(info) == 0) {
3240                         if ((try_smi_init(info)) == 0) {
3241                                 /* Found one... */
3242                                 printk(KERN_INFO PFX "Found default %s"
3243                                 " state machine at %s address 0x%lx\n",
3244                                 si_to_str[info->si_type],
3245                                 addr_space_to_str[info->io.addr_type],
3246                                 info->io.addr_data);
3247                         } else
3248                                 cleanup_one_si(info);
3249                 } else {
3250                         kfree(info);
3251                 }
3252         }
3253 }
3254 
3255 static int is_new_interface(struct smi_info *info)
3256 {
3257         struct smi_info *e;
3258 
3259         list_for_each_entry(e, &smi_infos, link) {
3260                 if (e->io.addr_type != info->io.addr_type)
3261                         continue;
3262                 if (e->io.addr_data == info->io.addr_data)
3263                         return 0;
3264         }
3265 
3266         return 1;
3267 }
3268 
3269 static int add_smi(struct smi_info *new_smi)
3270 {
3271         int rv = 0;
3272 
3273         printk(KERN_INFO PFX "Adding %s-specified %s state machine",
3274                         ipmi_addr_src_to_str[new_smi->addr_source],
3275                         si_to_str[new_smi->si_type]);
3276         mutex_lock(&smi_infos_lock);
3277         if (!is_new_interface(new_smi)) {
3278                 printk(KERN_CONT " duplicate interface\n");
3279                 rv = -EBUSY;
3280                 goto out_err;
3281         }
3282 
3283         printk(KERN_CONT "\n");
3284 
3285         /* So we know not to free it unless we have allocated one. */
3286         new_smi->intf = NULL;
3287         new_smi->si_sm = NULL;
3288         new_smi->handlers = NULL;
3289 
3290         list_add_tail(&new_smi->link, &smi_infos);
3291 
3292 out_err:
3293         mutex_unlock(&smi_infos_lock);
3294         return rv;
3295 }
3296 
3297 static int try_smi_init(struct smi_info *new_smi)
3298 {
3299         int rv = 0;
3300         int i;
3301 
3302         printk(KERN_INFO PFX "Trying %s-specified %s state"
3303                " machine at %s address 0x%lx, slave address 0x%x,"
3304                " irq %d\n",
3305                ipmi_addr_src_to_str[new_smi->addr_source],
3306                si_to_str[new_smi->si_type],
3307                addr_space_to_str[new_smi->io.addr_type],
3308                new_smi->io.addr_data,
3309                new_smi->slave_addr, new_smi->irq);
3310 
3311         switch (new_smi->si_type) {
3312         case SI_KCS:
3313                 new_smi->handlers = &kcs_smi_handlers;
3314                 break;
3315 
3316         case SI_SMIC:
3317                 new_smi->handlers = &smic_smi_handlers;
3318                 break;
3319 
3320         case SI_BT:
3321                 new_smi->handlers = &bt_smi_handlers;
3322                 break;
3323 
3324         default:
3325                 /* No support for anything else yet. */
3326                 rv = -EIO;
3327                 goto out_err;
3328         }
3329 
3330         /* Allocate the state machine's data and initialize it. */
3331         new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL);
3332         if (!new_smi->si_sm) {
3333                 printk(KERN_ERR PFX
3334                        "Could not allocate state machine memory\n");
3335                 rv = -ENOMEM;
3336                 goto out_err;
3337         }
3338         new_smi->io_size = new_smi->handlers->init_data(new_smi->si_sm,
3339                                                         &new_smi->io);
3340 
3341         /* Now that we know the I/O size, we can set up the I/O. */
3342         rv = new_smi->io_setup(new_smi);
3343         if (rv) {
3344                 printk(KERN_ERR PFX "Could not set up I/O space\n");
3345                 goto out_err;
3346         }
3347 
3348         /* Do low-level detection first. */
3349         if (new_smi->handlers->detect(new_smi->si_sm)) {
3350                 if (new_smi->addr_source)
3351                         printk(KERN_INFO PFX "Interface detection failed\n");
3352                 rv = -ENODEV;
3353                 goto out_err;
3354         }
3355 
3356         /*
3357          * Attempt a get device id command.  If it fails, we probably
3358          * don't have a BMC here.
3359          */
3360         rv = try_get_dev_id(new_smi);
3361         if (rv) {
3362                 if (new_smi->addr_source)
3363                         printk(KERN_INFO PFX "There appears to be no BMC"
3364                                " at this location\n");
3365                 goto out_err;
3366         }
3367 
3368         setup_oem_data_handler(new_smi);
3369         setup_xaction_handlers(new_smi);
3370 
3371         INIT_LIST_HEAD(&(new_smi->xmit_msgs));
3372         INIT_LIST_HEAD(&(new_smi->hp_xmit_msgs));
3373         new_smi->curr_msg = NULL;
3374         atomic_set(&new_smi->req_events, 0);
3375         new_smi->run_to_completion = false;
3376         for (i = 0; i < SI_NUM_STATS; i++)
3377                 atomic_set(&new_smi->stats[i], 0);
3378 
3379         new_smi->interrupt_disabled = true;
3380         atomic_set(&new_smi->stop_operation, 0);
3381         atomic_set(&new_smi->need_watch, 0);
3382         new_smi->intf_num = smi_num;
3383         smi_num++;
3384 
3385         rv = try_enable_event_buffer(new_smi);
3386         if (rv == 0)
3387                 new_smi->has_event_buffer = true;
3388 
3389         /*
3390          * Start clearing the flags before we enable interrupts or the
3391          * timer to avoid racing with the timer.
3392          */
3393         start_clear_flags(new_smi);
3394         /* IRQ is defined to be set when non-zero. */
3395         if (new_smi->irq)
3396                 new_smi->si_state = SI_CLEARING_FLAGS_THEN_SET_IRQ;
3397 
3398         if (!new_smi->dev) {
3399                 /*
3400                  * If we don't already have a device from something
3401                  * else (like PCI), then register a new one.
3402                  */
3403                 new_smi->pdev = platform_device_alloc("ipmi_si",
3404                                                       new_smi->intf_num);
3405                 if (!new_smi->pdev) {
3406                         printk(KERN_ERR PFX
3407                                "Unable to allocate platform device\n");
3408                         goto out_err;
3409                 }
3410                 new_smi->dev = &new_smi->pdev->dev;
3411                 new_smi->dev->driver = &ipmi_driver.driver;
3412 
3413                 rv = platform_device_add(new_smi->pdev);
3414                 if (rv) {
3415                         printk(KERN_ERR PFX
3416                                "Unable to register system interface device:"
3417                                " %d\n",
3418                                rv);
3419                         goto out_err;
3420                 }
3421                 new_smi->dev_registered = true;
3422         }
3423 
3424         rv = ipmi_register_smi(&handlers,
3425                                new_smi,
3426                                &new_smi->device_id,
3427                                new_smi->dev,
3428                                "bmc",
3429                                new_smi->slave_addr);
3430         if (rv) {
3431                 dev_err(new_smi->dev, "Unable to register device: error %d\n",
3432                         rv);
3433                 goto out_err_stop_timer;
3434         }
3435 
3436         rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
3437                                      &smi_type_proc_ops,
3438                                      new_smi);
3439         if (rv) {
3440                 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3441                 goto out_err_stop_timer;
3442         }
3443 
3444         rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
3445                                      &smi_si_stats_proc_ops,
3446                                      new_smi);
3447         if (rv) {
3448                 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3449                 goto out_err_stop_timer;
3450         }
3451 
3452         rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
3453                                      &smi_params_proc_ops,
3454                                      new_smi);
3455         if (rv) {
3456                 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
3457                 goto out_err_stop_timer;
3458         }
3459 
3460         dev_info(new_smi->dev, "IPMI %s interface initialized\n",
3461                  si_to_str[new_smi->si_type]);
3462 
3463         return 0;
3464 
3465  out_err_stop_timer:
3466         atomic_inc(&new_smi->stop_operation);
3467         wait_for_timer_and_thread(new_smi);
3468 
3469  out_err:
3470         new_smi->interrupt_disabled = true;
3471 
3472         if (new_smi->intf) {
3473                 ipmi_unregister_smi(new_smi->intf);
3474                 new_smi->intf = NULL;
3475         }
3476 
3477         if (new_smi->irq_cleanup) {
3478                 new_smi->irq_cleanup(new_smi);
3479                 new_smi->irq_cleanup = NULL;
3480         }
3481 
3482         /*
3483          * Wait until we know that we are out of any interrupt
3484          * handlers might have been running before we freed the
3485          * interrupt.
3486          */
3487         synchronize_sched();
3488 
3489         if (new_smi->si_sm) {
3490                 if (new_smi->handlers)
3491                         new_smi->handlers->cleanup(new_smi->si_sm);
3492                 kfree(new_smi->si_sm);
3493                 new_smi->si_sm = NULL;
3494         }
3495         if (new_smi->addr_source_cleanup) {
3496                 new_smi->addr_source_cleanup(new_smi);
3497                 new_smi->addr_source_cleanup = NULL;
3498         }
3499         if (new_smi->io_cleanup) {
3500                 new_smi->io_cleanup(new_smi);
3501                 new_smi->io_cleanup = NULL;
3502         }
3503 
3504         if (new_smi->dev_registered) {
3505                 platform_device_unregister(new_smi->pdev);
3506                 new_smi->dev_registered = false;
3507         }
3508 
3509         return rv;
3510 }
3511 
3512 static int init_ipmi_si(void)
3513 {
3514         int  i;
3515         char *str;
3516         int  rv;
3517         struct smi_info *e;
3518         enum ipmi_addr_src type = SI_INVALID;
3519 
3520         if (initialized)
3521                 return 0;
3522         initialized = 1;
3523 
3524         if (si_tryplatform) {
3525                 rv = platform_driver_register(&ipmi_driver);
3526                 if (rv) {
3527                         printk(KERN_ERR PFX "Unable to register "
3528                                "driver: %d\n", rv);
3529                         return rv;
3530                 }
3531         }
3532 
3533         /* Parse out the si_type string into its components. */
3534         str = si_type_str;
3535         if (*str != '\0') {
3536                 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
3537                         si_type[i] = str;
3538                         str = strchr(str, ',');
3539                         if (str) {
3540                                 *str = '\0';
3541                                 str++;
3542                         } else {
3543                                 break;
3544                         }
3545                 }
3546         }
3547 
3548         printk(KERN_INFO "IPMI System Interface driver.\n");
3549 
3550         /* If the user gave us a device, they presumably want us to use it */
3551         if (!hardcode_find_bmc())
3552                 return 0;
3553 
3554 #ifdef CONFIG_PCI
3555         if (si_trypci) {
3556                 rv = pci_register_driver(&ipmi_pci_driver);
3557                 if (rv)
3558                         printk(KERN_ERR PFX "Unable to register "
3559                                "PCI driver: %d\n", rv);
3560                 else
3561                         pci_registered = true;
3562         }
3563 #endif
3564 
3565 #ifdef CONFIG_ACPI
3566         if (si_tryacpi) {
3567                 pnp_register_driver(&ipmi_pnp_driver);
3568                 pnp_registered = true;
3569         }
3570 #endif
3571 
3572 #ifdef CONFIG_DMI
3573         if (si_trydmi)
3574                 dmi_find_bmc();
3575 #endif
3576 
3577 #ifdef CONFIG_ACPI
3578         if (si_tryacpi)
3579                 spmi_find_bmc();
3580 #endif
3581 
3582 #ifdef CONFIG_PARISC
3583         register_parisc_driver(&ipmi_parisc_driver);
3584         parisc_registered = true;
3585         /* poking PC IO addresses will crash machine, don't do it */
3586         si_trydefaults = 0;
3587 #endif
3588 
3589         /* We prefer devices with interrupts, but in the case of a machine
3590            with multiple BMCs we assume that there will be several instances
3591            of a given type so if we succeed in registering a type then also
3592            try to register everything else of the same type */
3593 
3594         mutex_lock(&smi_infos_lock);
3595         list_for_each_entry(e, &smi_infos, link) {
3596                 /* Try to register a device if it has an IRQ and we either
3597                    haven't successfully registered a device yet or this
3598                    device has the same type as one we successfully registered */
3599                 if (e->irq && (!type || e->addr_source == type)) {
3600                         if (!try_smi_init(e)) {
3601                                 type = e->addr_source;
3602                         }
3603                 }
3604         }
3605 
3606         /* type will only have been set if we successfully registered an si */
3607         if (type) {
3608                 mutex_unlock(&smi_infos_lock);
3609                 return 0;
3610         }
3611 
3612         /* Fall back to the preferred device */
3613 
3614         list_for_each_entry(e, &smi_infos, link) {
3615                 if (!e->irq && (!type || e->addr_source == type)) {
3616                         if (!try_smi_init(e)) {
3617                                 type = e->addr_source;
3618                         }
3619                 }
3620         }
3621         mutex_unlock(&smi_infos_lock);
3622 
3623         if (type)
3624                 return 0;
3625 
3626         if (si_trydefaults) {
3627                 mutex_lock(&smi_infos_lock);
3628                 if (list_empty(&smi_infos)) {
3629                         /* No BMC was found, try defaults. */
3630                         mutex_unlock(&smi_infos_lock);
3631                         default_find_bmc();
3632                 } else
3633                         mutex_unlock(&smi_infos_lock);
3634         }
3635 
3636         mutex_lock(&smi_infos_lock);
3637         if (unload_when_empty && list_empty(&smi_infos)) {
3638                 mutex_unlock(&smi_infos_lock);
3639                 cleanup_ipmi_si();
3640                 printk(KERN_WARNING PFX
3641                        "Unable to find any System Interface(s)\n");
3642                 return -ENODEV;
3643         } else {
3644                 mutex_unlock(&smi_infos_lock);
3645                 return 0;
3646         }
3647 }
3648 module_init(init_ipmi_si);
3649 
3650 static void cleanup_one_si(struct smi_info *to_clean)
3651 {
3652         int           rv = 0;
3653         unsigned long flags;
3654 
3655         if (!to_clean)
3656                 return;
3657 
3658         list_del(&to_clean->link);
3659 
3660         /* Tell the driver that we are shutting down. */
3661         atomic_inc(&to_clean->stop_operation);
3662 
3663         /*
3664          * Make sure the timer and thread are stopped and will not run
3665          * again.
3666          */
3667         wait_for_timer_and_thread(to_clean);
3668 
3669         /*
3670          * Timeouts are stopped, now make sure the interrupts are off
3671          * for the device.  A little tricky with locks to make sure
3672          * there are no races.
3673          */
3674         spin_lock_irqsave(&to_clean->si_lock, flags);
3675         while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
3676                 spin_unlock_irqrestore(&to_clean->si_lock, flags);
3677                 poll(to_clean);
3678                 schedule_timeout_uninterruptible(1);
3679                 spin_lock_irqsave(&to_clean->si_lock, flags);
3680         }
3681         disable_si_irq(to_clean);
3682         spin_unlock_irqrestore(&to_clean->si_lock, flags);
3683         while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
3684                 poll(to_clean);
3685                 schedule_timeout_uninterruptible(1);
3686         }
3687 
3688         /* Clean up interrupts and make sure that everything is done. */
3689         if (to_clean->irq_cleanup)
3690                 to_clean->irq_cleanup(to_clean);
3691         while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
3692                 poll(to_clean);
3693                 schedule_timeout_uninterruptible(1);
3694         }
3695 
3696         if (to_clean->intf)
3697                 rv = ipmi_unregister_smi(to_clean->intf);
3698 
3699         if (rv) {
3700                 printk(KERN_ERR PFX "Unable to unregister device: errno=%d\n",
3701                        rv);
3702         }
3703 
3704         if (to_clean->handlers)
3705                 to_clean->handlers->cleanup(to_clean->si_sm);
3706 
3707         kfree(to_clean->si_sm);
3708 
3709         if (to_clean->addr_source_cleanup)
3710                 to_clean->addr_source_cleanup(to_clean);
3711         if (to_clean->io_cleanup)
3712                 to_clean->io_cleanup(to_clean);
3713 
3714         if (to_clean->dev_registered)
3715                 platform_device_unregister(to_clean->pdev);
3716 
3717         kfree(to_clean);
3718 }
3719 
3720 static void cleanup_ipmi_si(void)
3721 {
3722         struct smi_info *e, *tmp_e;
3723 
3724         if (!initialized)
3725                 return;
3726 
3727 #ifdef CONFIG_PCI
3728         if (pci_registered)
3729                 pci_unregister_driver(&ipmi_pci_driver);
3730 #endif
3731 #ifdef CONFIG_ACPI
3732         if (pnp_registered)
3733                 pnp_unregister_driver(&ipmi_pnp_driver);
3734 #endif
3735 #ifdef CONFIG_PARISC
3736         if (parisc_registered)
3737                 unregister_parisc_driver(&ipmi_parisc_driver);
3738 #endif
3739 
3740         platform_driver_unregister(&ipmi_driver);
3741 
3742         mutex_lock(&smi_infos_lock);
3743         list_for_each_entry_safe(e, tmp_e, &smi_infos, link)
3744                 cleanup_one_si(e);
3745         mutex_unlock(&smi_infos_lock);
3746 }
3747 module_exit(cleanup_ipmi_si);
3748 
3749 MODULE_LICENSE("GPL");
3750 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
3751 MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT"
3752                    " system interfaces.");
3753 

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