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ipmi: Stop the timer immediately if idle
[linux-2.6-block.git] / drivers / char / ipmi / ipmi_si_intf.c
CommitLineData
1da177e4
LT		 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.
dba9b4f6 12 * Copyright 2006 IBM Corp., Christian Krafft <krafft@de.ibm.com>
1da177e4
LT		 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
1da177e4
LT		 42#include <linux/module.h>
43#include <linux/moduleparam.h>
1da177e4 44#include <linux/sched.h>
07412736 45#include <linux/seq_file.h>
1da177e4
LT		 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>
ea94027b 54#include <linux/notifier.h>
b0defcdb 55#include <linux/mutex.h>
e9a705a0 56#include <linux/kthread.h>
1da177e4 57#include <asm/irq.h>
1da177e4
LT		 58#include <linux/interrupt.h>
59#include <linux/rcupdate.h>
16f4232c 60#include <linux/ipmi.h>
1da177e4
LT		 61#include <linux/ipmi_smi.h>
62#include <asm/io.h>
63#include "ipmi_si_sm.h"
b224cd3a 64#include <linux/dmi.h>
b361e27b
CM		 65#include <linux/string.h>
66#include <linux/ctype.h>
11c675ce
SR		 67#include <linux/of_device.h>
68#include <linux/of_platform.h>
672d8eaf
RH		 69#include <linux/of_address.h>
70#include <linux/of_irq.h>
dba9b4f6 71
fdbeb7de
TB		 72#ifdef CONFIG_PARISC
73#include <asm/hardware.h> /* for register_parisc_driver() stuff */
74#include <asm/parisc-device.h>
75#endif
76
b361e27b 77#define PFX "ipmi_si: "
1da177e4
LT		 78
79/* Measure times between events in the driver. */
80#undef DEBUG_TIMING
81
82/* Call every 10 ms. */
83#define SI_TIMEOUT_TIME_USEC 10000
84#define SI_USEC_PER_JIFFY (1000000/HZ)
85#define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY)
86#define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a
c305e3d3 87 short timeout */
1da177e4
LT		 88
89enum si_intf_state {
90 SI_NORMAL,
91 SI_GETTING_FLAGS,
92 SI_GETTING_EVENTS,
93 SI_CLEARING_FLAGS,
1da177e4 94 SI_GETTING_MESSAGES,
d9b7e4f7
CM		 95 SI_CHECKING_ENABLES,
96 SI_SETTING_ENABLES
1da177e4
LT		 97 /* FIXME - add watchdog stuff. */
98};
99
9dbf68f9
CM		 100/* Some BT-specific defines we need here. */
101#define IPMI_BT_INTMASK_REG 2
102#define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2
103#define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1
104
1da177e4
LT		 105enum si_type {
106 SI_KCS, SI_SMIC, SI_BT
107};
b361e27b 108static char *si_to_str[] = { "kcs", "smic", "bt" };
1da177e4 109
50c812b2
CM		 110#define DEVICE_NAME "ipmi_si"
111
a1e9c9dd 112static struct platform_driver ipmi_driver;
64959e2d
CM		 113
114/*
115 * Indexes into stats[] in smi_info below.
116 */
ba8ff1c6
CM		 117enum si_stat_indexes {
118 /*
119 * Number of times the driver requested a timer while an operation
120 * was in progress.
121 */
122 SI_STAT_short_timeouts = 0,
123
124 /*
125 * Number of times the driver requested a timer while nothing was in
126 * progress.
127 */
128 SI_STAT_long_timeouts,
129
130 /* Number of times the interface was idle while being polled. */
131 SI_STAT_idles,
132
133 /* Number of interrupts the driver handled. */
134 SI_STAT_interrupts,
135
136 /* Number of time the driver got an ATTN from the hardware. */
137 SI_STAT_attentions,
64959e2d 138
ba8ff1c6
CM		 139 /* Number of times the driver requested flags from the hardware. */
140 SI_STAT_flag_fetches,
141
142 /* Number of times the hardware didn't follow the state machine. */
143 SI_STAT_hosed_count,
144
145 /* Number of completed messages. */
146 SI_STAT_complete_transactions,
147
148 /* Number of IPMI events received from the hardware. */
149 SI_STAT_events,
150
151 /* Number of watchdog pretimeouts. */
152 SI_STAT_watchdog_pretimeouts,
153
b3834be5 154 /* Number of asynchronous messages received. */
ba8ff1c6
CM		 155 SI_STAT_incoming_messages,
156
157
158 /* This *must* remain last, add new values above this. */
159 SI_NUM_STATS
160};
64959e2d 161
c305e3d3 162struct smi_info {
a9a2c44f 163 int intf_num;
1da177e4
LT		 164 ipmi_smi_t intf;
165 struct si_sm_data *si_sm;
81d02b7f 166 const struct si_sm_handlers *handlers;
1da177e4
LT		 167 enum si_type si_type;
168 spinlock_t si_lock;
b874b985 169 struct ipmi_smi_msg *waiting_msg;
1da177e4
LT		 170 struct ipmi_smi_msg *curr_msg;
171 enum si_intf_state si_state;
172
c305e3d3
CM		 173 /*
174 * Used to handle the various types of I/O that can occur with
175 * IPMI
176 */
1da177e4
LT		 177 struct si_sm_io io;
178 int (*io_setup)(struct smi_info *info);
179 void (*io_cleanup)(struct smi_info *info);
180 int (*irq_setup)(struct smi_info *info);
181 void (*irq_cleanup)(struct smi_info *info);
182 unsigned int io_size;
5fedc4a2 183 enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
b0defcdb
CM		 184 void (*addr_source_cleanup)(struct smi_info *info);
185 void *addr_source_data;
1da177e4 186
c305e3d3
CM		 187 /*
188 * Per-OEM handler, called from handle_flags(). Returns 1
189 * when handle_flags() needs to be re-run or 0 indicating it
190 * set si_state itself.
191 */
3ae0e0f9
CM		 192 int (*oem_data_avail_handler)(struct smi_info *smi_info);
193
c305e3d3
CM		 194 /*
195 * Flags from the last GET_MSG_FLAGS command, used when an ATTN
196 * is set to hold the flags until we are done handling everything
197 * from the flags.
198 */
1da177e4
LT		 199#define RECEIVE_MSG_AVAIL 0x01
200#define EVENT_MSG_BUFFER_FULL 0x02
201#define WDT_PRE_TIMEOUT_INT 0x08
3ae0e0f9
CM		 202#define OEM0_DATA_AVAIL 0x20
203#define OEM1_DATA_AVAIL 0x40
204#define OEM2_DATA_AVAIL 0x80
205#define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \
c305e3d3
CM		 206 OEM1_DATA_AVAIL | \
207 OEM2_DATA_AVAIL)
1da177e4
LT		 208 unsigned char msg_flags;
209
40112ae7 210 /* Does the BMC have an event buffer? */
7aefac26 211 bool has_event_buffer;
40112ae7 212
c305e3d3
CM		 213 /*
214 * If set to true, this will request events the next time the
215 * state machine is idle.
216 */
1da177e4
LT		 217 atomic_t req_events;
218
c305e3d3
CM		 219 /*
220 * If true, run the state machine to completion on every send
221 * call. Generally used after a panic to make sure stuff goes
222 * out.
223 */
7aefac26 224 bool run_to_completion;
1da177e4
LT		 225
226 /* The I/O port of an SI interface. */
227 int port;
228
c305e3d3
CM		 229 /*
230 * The space between start addresses of the two ports. For
231 * instance, if the first port is 0xca2 and the spacing is 4, then
232 * the second port is 0xca6.
233 */
1da177e4
LT		 234 unsigned int spacing;
235
236 /* zero if no irq; */
237 int irq;
238
239 /* The timer for this si. */
240 struct timer_list si_timer;
241
48e8ac29
BS		 242 /* This flag is set, if the timer is running (timer_pending() isn't enough) */
243 bool timer_running;
244
1da177e4
LT		 245 /* The time (in jiffies) the last timeout occurred at. */
246 unsigned long last_timeout_jiffies;
247
89986496
CM		 248 /* Are we waiting for the events, pretimeouts, received msgs? */
249 atomic_t need_watch;
250
c305e3d3
CM		 251 /*
252 * The driver will disable interrupts when it gets into a
253 * situation where it cannot handle messages due to lack of
254 * memory. Once that situation clears up, it will re-enable
255 * interrupts.
256 */
7aefac26 257 bool interrupt_disabled;
1da177e4 258
d9b7e4f7
CM		 259 /*
260 * Does the BMC support events?
261 */
262 bool supports_event_msg_buff;
263
1e7d6a45 264 /*
d0882897
CM		 265 * Can we disable interrupts the global enables receive irq
266 * bit? There are currently two forms of brokenness, some
267 * systems cannot disable the bit (which is technically within
268 * the spec but a bad idea) and some systems have the bit
269 * forced to zero even though interrupts work (which is
270 * clearly outside the spec). The next bool tells which form
271 * of brokenness is present.
1e7d6a45 272 */
d0882897
CM		 273 bool cannot_disable_irq;
274
275 /*
276 * Some systems are broken and cannot set the irq enable
277 * bit, even if they support interrupts.
278 */
279 bool irq_enable_broken;
1e7d6a45 280
a8df150c
CM		 281 /*
282 * Did we get an attention that we did not handle?
283 */
284 bool got_attn;
285
50c812b2 286 /* From the get device id response... */
3ae0e0f9 287 struct ipmi_device_id device_id;
1da177e4 288
50c812b2
CM		 289 /* Driver model stuff. */
290 struct device *dev;
291 struct platform_device *pdev;
292
c305e3d3
CM		 293 /*
294 * True if we allocated the device, false if it came from
295 * someplace else (like PCI).
296 */
7aefac26 297 bool dev_registered;
50c812b2 298
1da177e4
LT		 299 /* Slave address, could be reported from DMI. */
300 unsigned char slave_addr;
301
302 /* Counters and things for the proc filesystem. */
64959e2d 303 atomic_t stats[SI_NUM_STATS];
a9a2c44f 304
c305e3d3 305 struct task_struct *thread;
b0defcdb
CM		 306
307 struct list_head link;
16f4232c 308 union ipmi_smi_info_union addr_info;
1da177e4
LT		 309};
310
64959e2d
CM		 311#define smi_inc_stat(smi, stat) \
312 atomic_inc(&(smi)->stats[SI_STAT_ ## stat])
313#define smi_get_stat(smi, stat) \
314 ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat]))
315
a51f4a81
CM		 316#define SI_MAX_PARMS 4
317
318static int force_kipmid[SI_MAX_PARMS];
319static int num_force_kipmid;
56480287 320#ifdef CONFIG_PCI
7aefac26 321static bool pci_registered;
56480287 322#endif
fdbeb7de 323#ifdef CONFIG_PARISC
7aefac26 324static bool parisc_registered;
fdbeb7de 325#endif
a51f4a81 326
ae74e823
MW		 327static unsigned int kipmid_max_busy_us[SI_MAX_PARMS];
328static int num_max_busy_us;
329
7aefac26 330static bool unload_when_empty = true;
b361e27b 331
2407d77a 332static int add_smi(struct smi_info *smi);
b0defcdb 333static int try_smi_init(struct smi_info *smi);
b361e27b 334static void cleanup_one_si(struct smi_info *to_clean);
d2478521 335static void cleanup_ipmi_si(void);
b0defcdb 336
f93aae9f
JS		 337#ifdef DEBUG_TIMING
338void debug_timestamp(char *msg)
339{
48862ea2 340 struct timespec64 t;
f93aae9f 341
48862ea2
JS		 342 getnstimeofday64(&t);
343 pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) t.tv_sec, t.tv_nsec);
f93aae9f
JS		 344}
345#else
346#define debug_timestamp(x)
347#endif
348
e041c683 349static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list);
c305e3d3 350static int register_xaction_notifier(struct notifier_block *nb)
ea94027b 351{
e041c683 352 return atomic_notifier_chain_register(&xaction_notifier_list, nb);
ea94027b
CM		 353}
354
1da177e4
LT		 355static void deliver_recv_msg(struct smi_info *smi_info,
356 struct ipmi_smi_msg *msg)
357{
7adf579c 358 /* Deliver the message to the upper layer. */
968bf7cc
CM		 359 if (smi_info->intf)
360 ipmi_smi_msg_received(smi_info->intf, msg);
361 else
362 ipmi_free_smi_msg(msg);
1da177e4
LT		 363}
364
4d7cbac7 365static void return_hosed_msg(struct smi_info *smi_info, int cCode)
1da177e4
LT		 366{
367 struct ipmi_smi_msg *msg = smi_info->curr_msg;
368
4d7cbac7
CM		 369 if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED)
370 cCode = IPMI_ERR_UNSPECIFIED;
371 /* else use it as is */
372
25985edc 373 /* Make it a response */
1da177e4
LT		 374 msg->rsp[0] = msg->data[0] | 4;
375 msg->rsp[1] = msg->data[1];
4d7cbac7 376 msg->rsp[2] = cCode;
1da177e4
LT		 377 msg->rsp_size = 3;
378
379 smi_info->curr_msg = NULL;
380 deliver_recv_msg(smi_info, msg);
381}
382
383static enum si_sm_result start_next_msg(struct smi_info *smi_info)
384{
385 int rv;
1da177e4 386
b874b985 387 if (!smi_info->waiting_msg) {
1da177e4
LT		 388 smi_info->curr_msg = NULL;
389 rv = SI_SM_IDLE;
390 } else {
391 int err;
392
b874b985
CM		 393 smi_info->curr_msg = smi_info->waiting_msg;
394 smi_info->waiting_msg = NULL;
f93aae9f 395 debug_timestamp("Start2");
e041c683
AS		 396 err = atomic_notifier_call_chain(&xaction_notifier_list,
397 0, smi_info);
ea94027b
CM		 398 if (err & NOTIFY_STOP_MASK) {
399 rv = SI_SM_CALL_WITHOUT_DELAY;
400 goto out;
401 }
1da177e4
LT		 402 err = smi_info->handlers->start_transaction(
403 smi_info->si_sm,
404 smi_info->curr_msg->data,
405 smi_info->curr_msg->data_size);
c305e3d3 406 if (err)
4d7cbac7 407 return_hosed_msg(smi_info, err);
1da177e4
LT		 408
409 rv = SI_SM_CALL_WITHOUT_DELAY;
410 }
c305e3d3 411 out:
1da177e4
LT		 412 return rv;
413}
414
0cfec916
CM		 415static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val)
416{
417 smi_info->last_timeout_jiffies = jiffies;
418 mod_timer(&smi_info->si_timer, new_val);
419 smi_info->timer_running = true;
420}
421
422/*
423 * Start a new message and (re)start the timer and thread.
424 */
425static void start_new_msg(struct smi_info *smi_info, unsigned char *msg,
426 unsigned int size)
427{
428 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
429
430 if (smi_info->thread)
431 wake_up_process(smi_info->thread);
432
433 smi_info->handlers->start_transaction(smi_info->si_sm, msg, size);
434}
435
436static void start_check_enables(struct smi_info *smi_info, bool start_timer)
ee6cd5f8
CM		 437{
438 unsigned char msg[2];
439
440 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
441 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
442
0cfec916
CM		 443 if (start_timer)
444 start_new_msg(smi_info, msg, 2);
445 else
446 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
d9b7e4f7 447 smi_info->si_state = SI_CHECKING_ENABLES;
ee6cd5f8
CM		 448}
449
0cfec916 450static void start_clear_flags(struct smi_info *smi_info, bool start_timer)
1da177e4
LT		 451{
452 unsigned char msg[3];
453
454 /* Make sure the watchdog pre-timeout flag is not set at startup. */
455 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
456 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
457 msg[2] = WDT_PRE_TIMEOUT_INT;
458
0cfec916
CM		 459 if (start_timer)
460 start_new_msg(smi_info, msg, 3);
461 else
462 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
1da177e4
LT		 463 smi_info->si_state = SI_CLEARING_FLAGS;
464}
465
968bf7cc
CM		 466static void start_getting_msg_queue(struct smi_info *smi_info)
467{
468 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
469 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD;
470 smi_info->curr_msg->data_size = 2;
471
0cfec916
CM		 472 start_new_msg(smi_info, smi_info->curr_msg->data,
473 smi_info->curr_msg->data_size);
968bf7cc
CM		 474 smi_info->si_state = SI_GETTING_MESSAGES;
475}
476
477static void start_getting_events(struct smi_info *smi_info)
478{
479 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
480 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
481 smi_info->curr_msg->data_size = 2;
482
0cfec916
CM		 483 start_new_msg(smi_info, smi_info->curr_msg->data,
484 smi_info->curr_msg->data_size);
968bf7cc
CM		 485 smi_info->si_state = SI_GETTING_EVENTS;
486}
487
c305e3d3
CM		 488/*
489 * When we have a situtaion where we run out of memory and cannot
490 * allocate messages, we just leave them in the BMC and run the system
491 * polled until we can allocate some memory. Once we have some
492 * memory, we will re-enable the interrupt.
1e7d6a45
CM		 493 *
494 * Note that we cannot just use disable_irq(), since the interrupt may
495 * be shared.
c305e3d3 496 */
0cfec916 497static inline bool disable_si_irq(struct smi_info *smi_info, bool start_timer)
1da177e4 498{
b0defcdb 499 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
7aefac26 500 smi_info->interrupt_disabled = true;
0cfec916 501 start_check_enables(smi_info, start_timer);
968bf7cc 502 return true;
1da177e4 503 }
968bf7cc 504 return false;
1da177e4
LT		 505}
506
968bf7cc 507static inline bool enable_si_irq(struct smi_info *smi_info)
1da177e4
LT		 508{
509 if ((smi_info->irq) && (smi_info->interrupt_disabled)) {
7aefac26 510 smi_info->interrupt_disabled = false;
0cfec916 511 start_check_enables(smi_info, true);
968bf7cc
CM		 512 return true;
513 }
514 return false;
515}
516
517/*
518 * Allocate a message. If unable to allocate, start the interrupt
519 * disable process and return NULL. If able to allocate but
520 * interrupts are disabled, free the message and return NULL after
521 * starting the interrupt enable process.
522 */
523static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info)
524{
525 struct ipmi_smi_msg *msg;
526
527 msg = ipmi_alloc_smi_msg();
528 if (!msg) {
0cfec916 529 if (!disable_si_irq(smi_info, true))
968bf7cc
CM		 530 smi_info->si_state = SI_NORMAL;
531 } else if (enable_si_irq(smi_info)) {
532 ipmi_free_smi_msg(msg);
533 msg = NULL;
1da177e4 534 }
968bf7cc 535 return msg;
1da177e4
LT		 536}
537
538static void handle_flags(struct smi_info *smi_info)
539{
3ae0e0f9 540 retry:
1da177e4
LT		 541 if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
542 /* Watchdog pre-timeout */
64959e2d 543 smi_inc_stat(smi_info, watchdog_pretimeouts);
1da177e4 544
0cfec916 545 start_clear_flags(smi_info, true);
1da177e4 546 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
968bf7cc
CM		 547 if (smi_info->intf)
548 ipmi_smi_watchdog_pretimeout(smi_info->intf);
1da177e4
LT		 549 } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) {
550 /* Messages available. */
968bf7cc
CM		 551 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
552 if (!smi_info->curr_msg)
1da177e4 553 return;
1da177e4 554
968bf7cc 555 start_getting_msg_queue(smi_info);
1da177e4
LT		 556 } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) {
557 /* Events available. */
968bf7cc
CM		 558 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
559 if (!smi_info->curr_msg)
1da177e4 560 return;
1da177e4 561
968bf7cc 562 start_getting_events(smi_info);
4064d5ef 563 } else if (smi_info->msg_flags & OEM_DATA_AVAIL &&
c305e3d3 564 smi_info->oem_data_avail_handler) {
4064d5ef
CM		 565 if (smi_info->oem_data_avail_handler(smi_info))
566 goto retry;
c305e3d3 567 } else
1da177e4 568 smi_info->si_state = SI_NORMAL;
1da177e4
LT		 569}
570
d9b7e4f7
CM		 571/*
572 * Global enables we care about.
573 */
574#define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
575 IPMI_BMC_EVT_MSG_INTR)
576
95c97b59
CM		 577static u8 current_global_enables(struct smi_info *smi_info, u8 base,
578 bool *irq_on)
d9b7e4f7
CM		 579{
580 u8 enables = 0;
581
582 if (smi_info->supports_event_msg_buff)
583 enables |= IPMI_BMC_EVT_MSG_BUFF;
d9b7e4f7 584
d0882897
CM		 585 if (((smi_info->irq && !smi_info->interrupt_disabled) ||
586 smi_info->cannot_disable_irq) &&
587 !smi_info->irq_enable_broken)
d9b7e4f7 588 enables |= IPMI_BMC_RCV_MSG_INTR;
d9b7e4f7
CM		 589
590 if (smi_info->supports_event_msg_buff &&
d0882897
CM		 591 smi_info->irq && !smi_info->interrupt_disabled &&
592 !smi_info->irq_enable_broken)
d9b7e4f7 593 enables |= IPMI_BMC_EVT_MSG_INTR;
d9b7e4f7 594
95c97b59
CM		 595 *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR);
596
d9b7e4f7
CM		 597 return enables;
598}
599
95c97b59
CM		 600static void check_bt_irq(struct smi_info *smi_info, bool irq_on)
601{
602 u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG);
603
604 irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT;
605
606 if ((bool)irqstate == irq_on)
607 return;
608
609 if (irq_on)
610 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
611 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
612 else
613 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0);
614}
615
1da177e4
LT		 616static void handle_transaction_done(struct smi_info *smi_info)
617{
618 struct ipmi_smi_msg *msg;
1da177e4 619
f93aae9f 620 debug_timestamp("Done");
1da177e4
LT		 621 switch (smi_info->si_state) {
622 case SI_NORMAL:
b0defcdb 623 if (!smi_info->curr_msg)
1da177e4
LT		 624 break;
625
626 smi_info->curr_msg->rsp_size
627 = smi_info->handlers->get_result(
628 smi_info->si_sm,
629 smi_info->curr_msg->rsp,
630 IPMI_MAX_MSG_LENGTH);
631
c305e3d3
CM		 632 /*
633 * Do this here becase deliver_recv_msg() releases the
634 * lock, and a new message can be put in during the
635 * time the lock is released.
636 */
1da177e4
LT		 637 msg = smi_info->curr_msg;
638 smi_info->curr_msg = NULL;
639 deliver_recv_msg(smi_info, msg);
640 break;
641
642 case SI_GETTING_FLAGS:
643 {
644 unsigned char msg[4];
645 unsigned int len;
646
647 /* We got the flags from the SMI, now handle them. */
648 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
649 if (msg[2] != 0) {
c305e3d3 650 /* Error fetching flags, just give up for now. */
1da177e4
LT		 651 smi_info->si_state = SI_NORMAL;
652 } else if (len < 4) {
c305e3d3
CM		 653 /*
654 * Hmm, no flags. That's technically illegal, but
655 * don't use uninitialized data.
656 */
1da177e4
LT		 657 smi_info->si_state = SI_NORMAL;
658 } else {
659 smi_info->msg_flags = msg[3];
660 handle_flags(smi_info);
661 }
662 break;
663 }
664
665 case SI_CLEARING_FLAGS:
1da177e4
LT		 666 {
667 unsigned char msg[3];
668
669 /* We cleared the flags. */
670 smi_info->handlers->get_result(smi_info->si_sm, msg, 3);
671 if (msg[2] != 0) {
672 /* Error clearing flags */
279fbd0c
MS		 673 dev_warn(smi_info->dev,
674 "Error clearing flags: %2.2x\n", msg[2]);
1da177e4 675 }
d9b7e4f7 676 smi_info->si_state = SI_NORMAL;
1da177e4
LT		 677 break;
678 }
679
680 case SI_GETTING_EVENTS:
681 {
682 smi_info->curr_msg->rsp_size
683 = smi_info->handlers->get_result(
684 smi_info->si_sm,
685 smi_info->curr_msg->rsp,
686 IPMI_MAX_MSG_LENGTH);
687
c305e3d3
CM		 688 /*
689 * Do this here becase deliver_recv_msg() releases the
690 * lock, and a new message can be put in during the
691 * time the lock is released.
692 */
1da177e4
LT		 693 msg = smi_info->curr_msg;
694 smi_info->curr_msg = NULL;
695 if (msg->rsp[2] != 0) {
696 /* Error getting event, probably done. */
697 msg->done(msg);
698
699 /* Take off the event flag. */
700 smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
701 handle_flags(smi_info);
702 } else {
64959e2d 703 smi_inc_stat(smi_info, events);
1da177e4 704
c305e3d3
CM		 705 /*
706 * Do this before we deliver the message
707 * because delivering the message releases the
708 * lock and something else can mess with the
709 * state.
710 */
1da177e4
LT		 711 handle_flags(smi_info);
712
713 deliver_recv_msg(smi_info, msg);
714 }
715 break;
716 }
717
718 case SI_GETTING_MESSAGES:
719 {
720 smi_info->curr_msg->rsp_size
721 = smi_info->handlers->get_result(
722 smi_info->si_sm,
723 smi_info->curr_msg->rsp,
724 IPMI_MAX_MSG_LENGTH);
725
c305e3d3
CM		 726 /*
727 * Do this here becase deliver_recv_msg() releases the
728 * lock, and a new message can be put in during the
729 * time the lock is released.
730 */
1da177e4
LT		 731 msg = smi_info->curr_msg;
732 smi_info->curr_msg = NULL;
733 if (msg->rsp[2] != 0) {
734 /* Error getting event, probably done. */
735 msg->done(msg);
736
737 /* Take off the msg flag. */
738 smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
739 handle_flags(smi_info);
740 } else {
64959e2d 741 smi_inc_stat(smi_info, incoming_messages);
1da177e4 742
c305e3d3
CM		 743 /*
744 * Do this before we deliver the message
745 * because delivering the message releases the
746 * lock and something else can mess with the
747 * state.
748 */
1da177e4
LT		 749 handle_flags(smi_info);
750
751 deliver_recv_msg(smi_info, msg);
752 }
753 break;
754 }
755
d9b7e4f7 756 case SI_CHECKING_ENABLES:
1da177e4
LT		 757 {
758 unsigned char msg[4];
d9b7e4f7 759 u8 enables;
95c97b59 760 bool irq_on;
1da177e4
LT		 761
762 /* We got the flags from the SMI, now handle them. */
763 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
764 if (msg[2] != 0) {
0849bfec
CM		 765 dev_warn(smi_info->dev,
766 "Couldn't get irq info: %x.\n", msg[2]);
767 dev_warn(smi_info->dev,
768 "Maybe ok, but ipmi might run very slowly.\n");
1da177e4 769 smi_info->si_state = SI_NORMAL;
d9b7e4f7
CM		 770 break;
771 }
95c97b59
CM		 772 enables = current_global_enables(smi_info, 0, &irq_on);
773 if (smi_info->si_type == SI_BT)
774 /* BT has its own interrupt enable bit. */
775 check_bt_irq(smi_info, irq_on);
d9b7e4f7
CM		 776 if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) {
777 /* Enables are not correct, fix them. */
1da177e4
LT		 778 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
779 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
d9b7e4f7 780 msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK);
1da177e4
LT		 781 smi_info->handlers->start_transaction(
782 smi_info->si_sm, msg, 3);
d9b7e4f7
CM		 783 smi_info->si_state = SI_SETTING_ENABLES;
784 } else if (smi_info->supports_event_msg_buff) {
785 smi_info->curr_msg = ipmi_alloc_smi_msg();
786 if (!smi_info->curr_msg) {
787 smi_info->si_state = SI_NORMAL;
788 break;
789 }
790 start_getting_msg_queue(smi_info);
791 } else {
792 smi_info->si_state = SI_NORMAL;
1da177e4
LT		 793 }
794 break;
795 }
796
d9b7e4f7 797 case SI_SETTING_ENABLES:
1da177e4
LT		 798 {
799 unsigned char msg[4];
800
1da177e4 801 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
d9b7e4f7 802 if (msg[2] != 0)
0849bfec 803 dev_warn(smi_info->dev,
d9b7e4f7
CM		 804 "Could not set the global enables: 0x%x.\n",
805 msg[2]);
806
807 if (smi_info->supports_event_msg_buff) {
808 smi_info->curr_msg = ipmi_alloc_smi_msg();
809 if (!smi_info->curr_msg) {
810 smi_info->si_state = SI_NORMAL;
811 break;
812 }
813 start_getting_msg_queue(smi_info);
ee6cd5f8 814 } else {
d9b7e4f7 815 smi_info->si_state = SI_NORMAL;
ee6cd5f8 816 }
ee6cd5f8
CM		 817 break;
818 }
1da177e4
LT		 819 }
820}
821
c305e3d3
CM		 822/*
823 * Called on timeouts and events. Timeouts should pass the elapsed
824 * time, interrupts should pass in zero. Must be called with
825 * si_lock held and interrupts disabled.
826 */
1da177e4
LT		 827static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
828 int time)
829{
830 enum si_sm_result si_sm_result;
831
832 restart:
c305e3d3
CM		 833 /*
834 * There used to be a loop here that waited a little while
835 * (around 25us) before giving up. That turned out to be
836 * pointless, the minimum delays I was seeing were in the 300us
837 * range, which is far too long to wait in an interrupt. So
838 * we just run until the state machine tells us something
839 * happened or it needs a delay.
840 */
1da177e4
LT		 841 si_sm_result = smi_info->handlers->event(smi_info->si_sm, time);
842 time = 0;
843 while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY)
1da177e4 844 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
1da177e4 845
c305e3d3 846 if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) {
64959e2d 847 smi_inc_stat(smi_info, complete_transactions);
1da177e4
LT		 848
849 handle_transaction_done(smi_info);
850 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
c305e3d3 851 } else if (si_sm_result == SI_SM_HOSED) {
64959e2d 852 smi_inc_stat(smi_info, hosed_count);
1da177e4 853
c305e3d3
CM		 854 /*
855 * Do the before return_hosed_msg, because that
856 * releases the lock.
857 */
1da177e4
LT		 858 smi_info->si_state = SI_NORMAL;
859 if (smi_info->curr_msg != NULL) {
c305e3d3
CM		 860 /*
861 * If we were handling a user message, format
862 * a response to send to the upper layer to
863 * tell it about the error.
864 */
4d7cbac7 865 return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED);
1da177e4
LT		 866 }
867 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
868 }
869
4ea18425
CM		 870 /*
871 * We prefer handling attn over new messages. But don't do
872 * this if there is not yet an upper layer to handle anything.
873 */
a8df150c
CM		 874 if (likely(smi_info->intf) &&
875 (si_sm_result == SI_SM_ATTN || smi_info->got_attn)) {
1da177e4
LT		 876 unsigned char msg[2];
877
a8df150c
CM		 878 if (smi_info->si_state != SI_NORMAL) {
879 /*
880 * We got an ATTN, but we are doing something else.
881 * Handle the ATTN later.
882 */
883 smi_info->got_attn = true;
884 } else {
885 smi_info->got_attn = false;
886 smi_inc_stat(smi_info, attentions);
1da177e4 887
a8df150c
CM		 888 /*
889 * Got a attn, send down a get message flags to see
890 * what's causing it. It would be better to handle
891 * this in the upper layer, but due to the way
892 * interrupts work with the SMI, that's not really
893 * possible.
894 */
895 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
896 msg[1] = IPMI_GET_MSG_FLAGS_CMD;
1da177e4 897
0cfec916 898 start_new_msg(smi_info, msg, 2);
a8df150c
CM		 899 smi_info->si_state = SI_GETTING_FLAGS;
900 goto restart;
901 }
1da177e4
LT		 902 }
903
904 /* If we are currently idle, try to start the next message. */
905 if (si_sm_result == SI_SM_IDLE) {
64959e2d 906 smi_inc_stat(smi_info, idles);
1da177e4
LT		 907
908 si_sm_result = start_next_msg(smi_info);
909 if (si_sm_result != SI_SM_IDLE)
910 goto restart;
c305e3d3 911 }
1da177e4
LT		 912
913 if ((si_sm_result == SI_SM_IDLE)
c305e3d3
CM		 914 && (atomic_read(&smi_info->req_events))) {
915 /*
916 * We are idle and the upper layer requested that I fetch
917 * events, so do so.
918 */
55162fb1 919 atomic_set(&smi_info->req_events, 0);
1da177e4 920
d9b7e4f7
CM		 921 /*
922 * Take this opportunity to check the interrupt and
923 * message enable state for the BMC. The BMC can be
924 * asynchronously reset, and may thus get interrupts
925 * disable and messages disabled.
926 */
927 if (smi_info->supports_event_msg_buff || smi_info->irq) {
0cfec916 928 start_check_enables(smi_info, true);
d9b7e4f7
CM		 929 } else {
930 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
931 if (!smi_info->curr_msg)
932 goto out;
1da177e4 933
d9b7e4f7
CM		 934 start_getting_events(smi_info);
935 }
1da177e4
LT		 936 goto restart;
937 }
314ef52f
CM		 938
939 if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) {
940 /* Ok it if fails, the timer will just go off. */
941 if (del_timer(&smi_info->si_timer))
942 smi_info->timer_running = false;
943 }
944
55162fb1 945 out:
1da177e4
LT		 946 return si_sm_result;
947}
948
89986496
CM		 949static void check_start_timer_thread(struct smi_info *smi_info)
950{
951 if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
952 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
953
954 if (smi_info->thread)
955 wake_up_process(smi_info->thread);
956
957 start_next_msg(smi_info);
958 smi_event_handler(smi_info, 0);
959 }
960}
961
82802f96 962static void flush_messages(void *send_info)
e45361d7 963{
82802f96 964 struct smi_info *smi_info = send_info;
e45361d7
HK		 965 enum si_sm_result result;
966
967 /*
968 * Currently, this function is called only in run-to-completion
969 * mode. This means we are single-threaded, no need for locks.
970 */
971 result = smi_event_handler(smi_info, 0);
972 while (result != SI_SM_IDLE) {
973 udelay(SI_SHORT_TIMEOUT_USEC);
974 result = smi_event_handler(smi_info, SI_SHORT_TIMEOUT_USEC);
975 }
976}
977
1da177e4 978static void sender(void *send_info,
99ab32f3 979 struct ipmi_smi_msg *msg)
1da177e4
LT		 980{
981 struct smi_info *smi_info = send_info;
1da177e4 982 unsigned long flags;
1da177e4 983
f93aae9f 984 debug_timestamp("Enqueue");
1da177e4
LT		 985
986 if (smi_info->run_to_completion) {
bda4c30a 987 /*
82802f96
HK		 988 * If we are running to completion, start it. Upper
989 * layer will call flush_messages to clear it out.
bda4c30a 990 */
9f812704 991 smi_info->waiting_msg = msg;
1da177e4 992 return;
1da177e4 993 }
1da177e4 994
f60adf42 995 spin_lock_irqsave(&smi_info->si_lock, flags);
1d86e29b
CM		 996 /*
997 * The following two lines don't need to be under the lock for
998 * the lock's sake, but they do need SMP memory barriers to
999 * avoid getting things out of order. We are already claiming
1000 * the lock, anyway, so just do it under the lock to avoid the
1001 * ordering problem.
1002 */
1003 BUG_ON(smi_info->waiting_msg);
1004 smi_info->waiting_msg = msg;
89986496 1005 check_start_timer_thread(smi_info);
bda4c30a 1006 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1da177e4
LT		 1007}
1008
7aefac26 1009static void set_run_to_completion(void *send_info, bool i_run_to_completion)
1da177e4
LT		 1010{
1011 struct smi_info *smi_info = send_info;
1da177e4
LT		 1012
1013 smi_info->run_to_completion = i_run_to_completion;
e45361d7
HK		 1014 if (i_run_to_completion)
1015 flush_messages(smi_info);
1da177e4
LT		 1016}
1017
ae74e823
MW		 1018/*
1019 * Use -1 in the nsec value of the busy waiting timespec to tell that
1020 * we are spinning in kipmid looking for something and not delaying
1021 * between checks
1022 */
48862ea2 1023static inline void ipmi_si_set_not_busy(struct timespec64 *ts)
ae74e823
MW		 1024{
1025 ts->tv_nsec = -1;
1026}
48862ea2 1027static inline int ipmi_si_is_busy(struct timespec64 *ts)
ae74e823
MW		 1028{
1029 return ts->tv_nsec != -1;
1030}
1031
cc4cbe90
AB		 1032static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result,
1033 const struct smi_info *smi_info,
48862ea2 1034 struct timespec64 *busy_until)
ae74e823
MW		 1035{
1036 unsigned int max_busy_us = 0;
1037
1038 if (smi_info->intf_num < num_max_busy_us)
1039 max_busy_us = kipmid_max_busy_us[smi_info->intf_num];
1040 if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY)
1041 ipmi_si_set_not_busy(busy_until);
1042 else if (!ipmi_si_is_busy(busy_until)) {
48862ea2
JS		 1043 getnstimeofday64(busy_until);
1044 timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC);
ae74e823 1045 } else {
48862ea2
JS		 1046 struct timespec64 now;
1047
1048 getnstimeofday64(&now);
1049 if (unlikely(timespec64_compare(&now, busy_until) > 0)) {
ae74e823
MW		 1050 ipmi_si_set_not_busy(busy_until);
1051 return 0;
1052 }
1053 }
1054 return 1;
1055}
1056
1057
1058/*
1059 * A busy-waiting loop for speeding up IPMI operation.
1060 *
1061 * Lousy hardware makes this hard. This is only enabled for systems
1062 * that are not BT and do not have interrupts. It starts spinning
1063 * when an operation is complete or until max_busy tells it to stop
1064 * (if that is enabled). See the paragraph on kimid_max_busy_us in
1065 * Documentation/IPMI.txt for details.
1066 */
a9a2c44f
CM		 1067static int ipmi_thread(void *data)
1068{
1069 struct smi_info *smi_info = data;
e9a705a0 1070 unsigned long flags;
a9a2c44f 1071 enum si_sm_result smi_result;
48862ea2 1072 struct timespec64 busy_until;
a9a2c44f 1073
ae74e823 1074 ipmi_si_set_not_busy(&busy_until);
8698a745 1075 set_user_nice(current, MAX_NICE);
e9a705a0 1076 while (!kthread_should_stop()) {
ae74e823
MW		 1077 int busy_wait;
1078
a9a2c44f 1079 spin_lock_irqsave(&(smi_info->si_lock), flags);
8a3628d5 1080 smi_result = smi_event_handler(smi_info, 0);
48e8ac29
BS		 1081
1082 /*
1083 * If the driver is doing something, there is a possible
1084 * race with the timer. If the timer handler see idle,
1085 * and the thread here sees something else, the timer
1086 * handler won't restart the timer even though it is
1087 * required. So start it here if necessary.
1088 */
1089 if (smi_result != SI_SM_IDLE && !smi_info->timer_running)
1090 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
1091
a9a2c44f 1092 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
ae74e823
MW		 1093 busy_wait = ipmi_thread_busy_wait(smi_result, smi_info,
1094 &busy_until);
c305e3d3
CM		 1095 if (smi_result == SI_SM_CALL_WITHOUT_DELAY)
1096 ; /* do nothing */
ae74e823 1097 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
33979734 1098 schedule();
89986496
CM		 1099 else if (smi_result == SI_SM_IDLE) {
1100 if (atomic_read(&smi_info->need_watch)) {
1101 schedule_timeout_interruptible(100);
1102 } else {
1103 /* Wait to be woken up when we are needed. */
1104 __set_current_state(TASK_INTERRUPTIBLE);
1105 schedule();
1106 }
1107 } else
8d1f66dc 1108 schedule_timeout_interruptible(1);
a9a2c44f 1109 }
a9a2c44f
CM		 1110 return 0;
1111}
1112
1113
1da177e4
LT		 1114static void poll(void *send_info)
1115{
1116 struct smi_info *smi_info = send_info;
f60adf42 1117 unsigned long flags = 0;
7aefac26 1118 bool run_to_completion = smi_info->run_to_completion;
1da177e4 1119
15c62e10
CM		 1120 /*
1121 * Make sure there is some delay in the poll loop so we can
1122 * drive time forward and timeout things.
1123 */
1124 udelay(10);
f60adf42
CM		 1125 if (!run_to_completion)
1126 spin_lock_irqsave(&smi_info->si_lock, flags);
15c62e10 1127 smi_event_handler(smi_info, 10);
f60adf42
CM		 1128 if (!run_to_completion)
1129 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1da177e4
LT		 1130}
1131
1132static void request_events(void *send_info)
1133{
1134 struct smi_info *smi_info = send_info;
1135
b874b985 1136 if (!smi_info->has_event_buffer)
b361e27b
CM		 1137 return;
1138
1da177e4
LT		 1139 atomic_set(&smi_info->req_events, 1);
1140}
1141
7aefac26 1142static void set_need_watch(void *send_info, bool enable)
89986496
CM		 1143{
1144 struct smi_info *smi_info = send_info;
1145 unsigned long flags;
1146
1147 atomic_set(&smi_info->need_watch, enable);
1148 spin_lock_irqsave(&smi_info->si_lock, flags);
1149 check_start_timer_thread(smi_info);
1150 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1151}
1152
0c8204b3 1153static int initialized;
1da177e4 1154
1da177e4
LT		 1155static void smi_timeout(unsigned long data)
1156{
1157 struct smi_info *smi_info = (struct smi_info *) data;
1158 enum si_sm_result smi_result;
1159 unsigned long flags;
1160 unsigned long jiffies_now;
c4edff1c 1161 long time_diff;
3326f4f2 1162 long timeout;
1da177e4 1163
1da177e4 1164 spin_lock_irqsave(&(smi_info->si_lock), flags);
f93aae9f
JS		 1165 debug_timestamp("Timer");
1166
1da177e4 1167 jiffies_now = jiffies;
c4edff1c 1168 time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies)
1da177e4
LT		 1169 * SI_USEC_PER_JIFFY);
1170 smi_result = smi_event_handler(smi_info, time_diff);
1171
b0defcdb 1172 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
1da177e4 1173 /* Running with interrupts, only do long timeouts. */
3326f4f2 1174 timeout = jiffies + SI_TIMEOUT_JIFFIES;
64959e2d 1175 smi_inc_stat(smi_info, long_timeouts);
3326f4f2 1176 goto do_mod_timer;
1da177e4
LT		 1177 }
1178
c305e3d3
CM		 1179 /*
1180 * If the state machine asks for a short delay, then shorten
1181 * the timer timeout.
1182 */
1da177e4 1183 if (smi_result == SI_SM_CALL_WITH_DELAY) {
64959e2d 1184 smi_inc_stat(smi_info, short_timeouts);
3326f4f2 1185 timeout = jiffies + 1;
1da177e4 1186 } else {
64959e2d 1187 smi_inc_stat(smi_info, long_timeouts);
3326f4f2 1188 timeout = jiffies + SI_TIMEOUT_JIFFIES;
1da177e4
LT		 1189 }
1190
3326f4f2
MG		 1191 do_mod_timer:
1192 if (smi_result != SI_SM_IDLE)
48e8ac29
BS		 1193 smi_mod_timer(smi_info, timeout);
1194 else
1195 smi_info->timer_running = false;
1196 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1da177e4
LT		 1197}
1198
7d12e780 1199static irqreturn_t si_irq_handler(int irq, void *data)
1da177e4
LT		 1200{
1201 struct smi_info *smi_info = data;
1202 unsigned long flags;
1da177e4
LT		 1203
1204 spin_lock_irqsave(&(smi_info->si_lock), flags);
1205
64959e2d 1206 smi_inc_stat(smi_info, interrupts);
1da177e4 1207
f93aae9f
JS		 1208 debug_timestamp("Interrupt");
1209
1da177e4 1210 smi_event_handler(smi_info, 0);
1da177e4
LT		 1211 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1212 return IRQ_HANDLED;
1213}
1214
7d12e780 1215static irqreturn_t si_bt_irq_handler(int irq, void *data)
9dbf68f9
CM		 1216{
1217 struct smi_info *smi_info = data;
1218 /* We need to clear the IRQ flag for the BT interface. */
1219 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
1220 IPMI_BT_INTMASK_CLEAR_IRQ_BIT
1221 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
7d12e780 1222 return si_irq_handler(irq, data);
9dbf68f9
CM		 1223}
1224
453823ba
CM		 1225static int smi_start_processing(void *send_info,
1226 ipmi_smi_t intf)
1227{
1228 struct smi_info *new_smi = send_info;
a51f4a81 1229 int enable = 0;
453823ba
CM		 1230
1231 new_smi->intf = intf;
1232
c45adc39
CM		 1233 /* Try to claim any interrupts. */
1234 if (new_smi->irq_setup)
1235 new_smi->irq_setup(new_smi);
1236
453823ba
CM		 1237 /* Set up the timer that drives the interface. */
1238 setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi);
48e8ac29 1239 smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES);
453823ba 1240
a51f4a81
CM		 1241 /*
1242 * Check if the user forcefully enabled the daemon.
1243 */
1244 if (new_smi->intf_num < num_force_kipmid)
1245 enable = force_kipmid[new_smi->intf_num];
df3fe8de
CM		 1246 /*
1247 * The BT interface is efficient enough to not need a thread,
1248 * and there is no need for a thread if we have interrupts.
1249 */
c305e3d3 1250 else if ((new_smi->si_type != SI_BT) && (!new_smi->irq))
a51f4a81
CM		 1251 enable = 1;
1252
1253 if (enable) {
453823ba
CM		 1254 new_smi->thread = kthread_run(ipmi_thread, new_smi,
1255 "kipmi%d", new_smi->intf_num);
1256 if (IS_ERR(new_smi->thread)) {
279fbd0c
MS		 1257 dev_notice(new_smi->dev, "Could not start"
1258 " kernel thread due to error %ld, only using"
1259 " timers to drive the interface\n",
1260 PTR_ERR(new_smi->thread));
453823ba
CM		 1261 new_smi->thread = NULL;
1262 }
1263 }
1264
1265 return 0;
1266}
9dbf68f9 1267
16f4232c
ZY		 1268static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1269{
1270 struct smi_info *smi = send_info;
1271
1272 data->addr_src = smi->addr_source;
1273 data->dev = smi->dev;
1274 data->addr_info = smi->addr_info;
1275 get_device(smi->dev);
1276
1277 return 0;
1278}
1279
7aefac26 1280static void set_maintenance_mode(void *send_info, bool enable)
b9675136
CM		 1281{
1282 struct smi_info *smi_info = send_info;
1283
1284 if (!enable)
1285 atomic_set(&smi_info->req_events, 0);
1286}
1287
81d02b7f 1288static const struct ipmi_smi_handlers handlers = {
1da177e4 1289 .owner = THIS_MODULE,
453823ba 1290 .start_processing = smi_start_processing,
16f4232c 1291 .get_smi_info = get_smi_info,
1da177e4
LT		 1292 .sender = sender,
1293 .request_events = request_events,
89986496 1294 .set_need_watch = set_need_watch,
b9675136 1295 .set_maintenance_mode = set_maintenance_mode,
1da177e4 1296 .set_run_to_completion = set_run_to_completion,
82802f96 1297 .flush_messages = flush_messages,
1da177e4
LT		 1298 .poll = poll,
1299};
1300
c305e3d3
CM		 1301/*
1302 * There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
1303 * a default IO port, and 1 ACPI/SPMI address. That sets SI_MAX_DRIVERS.
1304 */
1da177e4 1305
b0defcdb 1306static LIST_HEAD(smi_infos);
d6dfd131 1307static DEFINE_MUTEX(smi_infos_lock);
b0defcdb 1308static int smi_num; /* Used to sequence the SMIs */
1da177e4 1309
1da177e4 1310#define DEFAULT_REGSPACING 1
dba9b4f6 1311#define DEFAULT_REGSIZE 1
1da177e4 1312
d941aeae 1313#ifdef CONFIG_ACPI
fedb25ea 1314static bool si_tryacpi = true;
d941aeae
CM		 1315#endif
1316#ifdef CONFIG_DMI
fedb25ea 1317static bool si_trydmi = true;
d941aeae 1318#endif
fedb25ea 1319static bool si_tryplatform = true;
f2afae46 1320#ifdef CONFIG_PCI
fedb25ea 1321static bool si_trypci = true;
f2afae46 1322#endif
0dfe6e7e 1323static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
1da177e4
LT		 1324static char *si_type[SI_MAX_PARMS];
1325#define MAX_SI_TYPE_STR 30
1326static char si_type_str[MAX_SI_TYPE_STR];
1327static unsigned long addrs[SI_MAX_PARMS];
64a6f950 1328static unsigned int num_addrs;
1da177e4 1329static unsigned int ports[SI_MAX_PARMS];
64a6f950 1330static unsigned int num_ports;
1da177e4 1331static int irqs[SI_MAX_PARMS];
64a6f950 1332static unsigned int num_irqs;
1da177e4 1333static int regspacings[SI_MAX_PARMS];
64a6f950 1334static unsigned int num_regspacings;
1da177e4 1335static int regsizes[SI_MAX_PARMS];
64a6f950 1336static unsigned int num_regsizes;
1da177e4 1337static int regshifts[SI_MAX_PARMS];
64a6f950 1338static unsigned int num_regshifts;
2f95d513 1339static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */
64a6f950 1340static unsigned int num_slave_addrs;
1da177e4 1341
b361e27b
CM		 1342#define IPMI_IO_ADDR_SPACE 0
1343#define IPMI_MEM_ADDR_SPACE 1
1d5636cc 1344static char *addr_space_to_str[] = { "i/o", "mem" };
b361e27b
CM		 1345
1346static int hotmod_handler(const char *val, struct kernel_param *kp);
1347
1348module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
1349MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
1350 " Documentation/IPMI.txt in the kernel sources for the"
1351 " gory details.");
1da177e4 1352
d941aeae
CM		 1353#ifdef CONFIG_ACPI
1354module_param_named(tryacpi, si_tryacpi, bool, 0);
1355MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1356 " default scan of the interfaces identified via ACPI");
1357#endif
1358#ifdef CONFIG_DMI
1359module_param_named(trydmi, si_trydmi, bool, 0);
1360MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
1361 " default scan of the interfaces identified via DMI");
1362#endif
f2afae46
CM		 1363module_param_named(tryplatform, si_tryplatform, bool, 0);
1364MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1365 " default scan of the interfaces identified via platform"
1366 " interfaces like openfirmware");
1367#ifdef CONFIG_PCI
1368module_param_named(trypci, si_trypci, bool, 0);
1369MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1370 " default scan of the interfaces identified via pci");
1371#endif
1da177e4
LT		 1372module_param_named(trydefaults, si_trydefaults, bool, 0);
1373MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the"
1374 " default scan of the KCS and SMIC interface at the standard"
1375 " address");
1376module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
1377MODULE_PARM_DESC(type, "Defines the type of each interface, each"
1378 " interface separated by commas. The types are 'kcs',"
1379 " 'smic', and 'bt'. For example si_type=kcs,bt will set"
1380 " the first interface to kcs and the second to bt");
64a6f950 1381module_param_array(addrs, ulong, &num_addrs, 0);
1da177e4
LT		 1382MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
1383 " addresses separated by commas. Only use if an interface"
1384 " is in memory. Otherwise, set it to zero or leave"
1385 " it blank.");
64a6f950 1386module_param_array(ports, uint, &num_ports, 0);
1da177e4
LT		 1387MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
1388 " addresses separated by commas. Only use if an interface"
1389 " is a port. Otherwise, set it to zero or leave"
1390 " it blank.");
1391module_param_array(irqs, int, &num_irqs, 0);
1392MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
1393 " addresses separated by commas. Only use if an interface"
1394 " has an interrupt. Otherwise, set it to zero or leave"
1395 " it blank.");
1396module_param_array(regspacings, int, &num_regspacings, 0);
1397MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
1398 " and each successive register used by the interface. For"
1399 " instance, if the start address is 0xca2 and the spacing"
1400 " is 2, then the second address is at 0xca4. Defaults"
1401 " to 1.");
1402module_param_array(regsizes, int, &num_regsizes, 0);
1403MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
1404 " This should generally be 1, 2, 4, or 8 for an 8-bit,"
1405 " 16-bit, 32-bit, or 64-bit register. Use this if you"
1406 " the 8-bit IPMI register has to be read from a larger"
1407 " register.");
1408module_param_array(regshifts, int, &num_regshifts, 0);
1409MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
1410 " IPMI register, in bits. For instance, if the data"
1411 " is read from a 32-bit word and the IPMI data is in"
1412 " bit 8-15, then the shift would be 8");
1413module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1414MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
1415 " the controller. Normally this is 0x20, but can be"
1416 " overridden by this parm. This is an array indexed"
1417 " by interface number.");
a51f4a81
CM		 1418module_param_array(force_kipmid, int, &num_force_kipmid, 0);
1419MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or"
1420 " disabled(0). Normally the IPMI driver auto-detects"
1421 " this, but the value may be overridden by this parm.");
7aefac26 1422module_param(unload_when_empty, bool, 0);
b361e27b
CM		 1423MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are"
1424 " specified or found, default is 1. Setting to 0"
1425 " is useful for hot add of devices using hotmod.");
ae74e823
MW		 1426module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644);
1427MODULE_PARM_DESC(kipmid_max_busy_us,
1428 "Max time (in microseconds) to busy-wait for IPMI data before"
1429 " sleeping. 0 (default) means to wait forever. Set to 100-500"
1430 " if kipmid is using up a lot of CPU time.");
1da177e4
LT		 1431
1432
b0defcdb 1433static void std_irq_cleanup(struct smi_info *info)
1da177e4 1434{
b0defcdb
CM		 1435 if (info->si_type == SI_BT)
1436 /* Disable the interrupt in the BT interface. */
1437 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0);
1438 free_irq(info->irq, info);
1da177e4 1439}
1da177e4
LT		 1440
1441static int std_irq_setup(struct smi_info *info)
1442{
1443 int rv;
1444
b0defcdb 1445 if (!info->irq)
1da177e4
LT		 1446 return 0;
1447
9dbf68f9
CM		 1448 if (info->si_type == SI_BT) {
1449 rv = request_irq(info->irq,
1450 si_bt_irq_handler,
aa5b2bab 1451 IRQF_SHARED,
9dbf68f9
CM		 1452 DEVICE_NAME,
1453 info);
b0defcdb 1454 if (!rv)
9dbf68f9
CM		 1455 /* Enable the interrupt in the BT interface. */
1456 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG,
1457 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1458 } else
1459 rv = request_irq(info->irq,
1460 si_irq_handler,
aa5b2bab 1461 IRQF_SHARED,
9dbf68f9
CM		 1462 DEVICE_NAME,
1463 info);
1da177e4 1464 if (rv) {
279fbd0c
MS		 1465 dev_warn(info->dev, "%s unable to claim interrupt %d,"
1466 " running polled\n",
1467 DEVICE_NAME, info->irq);
1da177e4
LT		 1468 info->irq = 0;
1469 } else {
b0defcdb 1470 info->irq_cleanup = std_irq_cleanup;
279fbd0c 1471 dev_info(info->dev, "Using irq %d\n", info->irq);
1da177e4
LT		 1472 }
1473
1474 return rv;
1475}
1476
81d02b7f 1477static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset)
1da177e4 1478{
b0defcdb 1479 unsigned int addr = io->addr_data;
1da177e4 1480
b0defcdb 1481 return inb(addr + (offset * io->regspacing));
1da177e4
LT		 1482}
1483
81d02b7f 1484static void port_outb(const struct si_sm_io *io, unsigned int offset,
1da177e4
LT		 1485 unsigned char b)
1486{
b0defcdb 1487 unsigned int addr = io->addr_data;
1da177e4 1488
b0defcdb 1489 outb(b, addr + (offset * io->regspacing));
1da177e4
LT		 1490}
1491
81d02b7f 1492static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset)
1da177e4 1493{
b0defcdb 1494 unsigned int addr = io->addr_data;
1da177e4 1495
b0defcdb 1496 return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1da177e4
LT		 1497}
1498
81d02b7f 1499static void port_outw(const struct si_sm_io *io, unsigned int offset,
1da177e4
LT		 1500 unsigned char b)
1501{
b0defcdb 1502 unsigned int addr = io->addr_data;
1da177e4 1503
b0defcdb 1504 outw(b << io->regshift, addr + (offset * io->regspacing));
1da177e4
LT		 1505}
1506
81d02b7f 1507static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset)
1da177e4 1508{
b0defcdb 1509 unsigned int addr = io->addr_data;
1da177e4 1510
b0defcdb 1511 return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1da177e4
LT		 1512}
1513
81d02b7f 1514static void port_outl(const struct si_sm_io *io, unsigned int offset,
1da177e4
LT		 1515 unsigned char b)
1516{
b0defcdb 1517 unsigned int addr = io->addr_data;
1da177e4 1518
b0defcdb 1519 outl(b << io->regshift, addr+(offset * io->regspacing));
1da177e4
LT		 1520}
1521
1522static void port_cleanup(struct smi_info *info)
1523{
b0defcdb 1524 unsigned int addr = info->io.addr_data;
d61a3ead 1525 int idx;
1da177e4 1526
b0defcdb 1527 if (addr) {
c305e3d3 1528 for (idx = 0; idx < info->io_size; idx++)
d61a3ead
CM		 1529 release_region(addr + idx * info->io.regspacing,
1530 info->io.regsize);
1da177e4 1531 }
1da177e4
LT		 1532}
1533
1534static int port_setup(struct smi_info *info)
1535{
b0defcdb 1536 unsigned int addr = info->io.addr_data;
d61a3ead 1537 int idx;
1da177e4 1538
b0defcdb 1539 if (!addr)
1da177e4
LT		 1540 return -ENODEV;
1541
1542 info->io_cleanup = port_cleanup;
1543
c305e3d3
CM		 1544 /*
1545 * Figure out the actual inb/inw/inl/etc routine to use based
1546 * upon the register size.
1547 */
1da177e4
LT		 1548 switch (info->io.regsize) {
1549 case 1:
1550 info->io.inputb = port_inb;
1551 info->io.outputb = port_outb;
1552 break;
1553 case 2:
1554 info->io.inputb = port_inw;
1555 info->io.outputb = port_outw;
1556 break;
1557 case 4:
1558 info->io.inputb = port_inl;
1559 info->io.outputb = port_outl;
1560 break;
1561 default:
279fbd0c
MS		 1562 dev_warn(info->dev, "Invalid register size: %d\n",
1563 info->io.regsize);
1da177e4
LT		 1564 return -EINVAL;
1565 }
1566
c305e3d3
CM		 1567 /*
1568 * Some BIOSes reserve disjoint I/O regions in their ACPI
d61a3ead
CM		 1569 * tables. This causes problems when trying to register the
1570 * entire I/O region. Therefore we must register each I/O
1571 * port separately.
1572 */
c305e3d3 1573 for (idx = 0; idx < info->io_size; idx++) {
d61a3ead
CM		 1574 if (request_region(addr + idx * info->io.regspacing,
1575 info->io.regsize, DEVICE_NAME) == NULL) {
1576 /* Undo allocations */
1577 while (idx--) {
1578 release_region(addr + idx * info->io.regspacing,
1579 info->io.regsize);
1580 }
1581 return -EIO;
1582 }
1583 }
1da177e4
LT		 1584 return 0;
1585}
1586
81d02b7f
CM		 1587static unsigned char intf_mem_inb(const struct si_sm_io *io,
1588 unsigned int offset)
1da177e4
LT		 1589{
1590 return readb((io->addr)+(offset * io->regspacing));
1591}
1592
81d02b7f
CM		 1593static void intf_mem_outb(const struct si_sm_io *io, unsigned int offset,
1594 unsigned char b)
1da177e4
LT		 1595{
1596 writeb(b, (io->addr)+(offset * io->regspacing));
1597}
1598
81d02b7f
CM		 1599static unsigned char intf_mem_inw(const struct si_sm_io *io,
1600 unsigned int offset)
1da177e4
LT		 1601{
1602 return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)
64d9fe69 1603 & 0xff;
1da177e4
LT		 1604}
1605
81d02b7f
CM		 1606static void intf_mem_outw(const struct si_sm_io *io, unsigned int offset,
1607 unsigned char b)
1da177e4
LT		 1608{
1609 writeb(b << io->regshift, (io->addr)+(offset * io->regspacing));
1610}
1611
81d02b7f
CM		 1612static unsigned char intf_mem_inl(const struct si_sm_io *io,
1613 unsigned int offset)
1da177e4
LT		 1614{
1615 return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)
64d9fe69 1616 & 0xff;
1da177e4
LT		 1617}
1618
81d02b7f
CM		 1619static void intf_mem_outl(const struct si_sm_io *io, unsigned int offset,
1620 unsigned char b)
1da177e4
LT		 1621{
1622 writel(b << io->regshift, (io->addr)+(offset * io->regspacing));
1623}
1624
1625#ifdef readq
81d02b7f 1626static unsigned char mem_inq(const struct si_sm_io *io, unsigned int offset)
1da177e4
LT		 1627{
1628 return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)
64d9fe69 1629 & 0xff;
1da177e4
LT		 1630}
1631
81d02b7f 1632static void mem_outq(const struct si_sm_io *io, unsigned int offset,
1da177e4
LT		 1633 unsigned char b)
1634{
1635 writeq(b << io->regshift, (io->addr)+(offset * io->regspacing));
1636}
1637#endif
1638
1639static void mem_cleanup(struct smi_info *info)
1640{
b0defcdb 1641 unsigned long addr = info->io.addr_data;
1da177e4
LT		 1642 int mapsize;
1643
1644 if (info->io.addr) {
1645 iounmap(info->io.addr);
1646
1647 mapsize = ((info->io_size * info->io.regspacing)
1648 - (info->io.regspacing - info->io.regsize));
1649
b0defcdb 1650 release_mem_region(addr, mapsize);
1da177e4 1651 }
1da177e4
LT		 1652}
1653
1654static int mem_setup(struct smi_info *info)
1655{
b0defcdb 1656 unsigned long addr = info->io.addr_data;
1da177e4
LT		 1657 int mapsize;
1658
b0defcdb 1659 if (!addr)
1da177e4
LT		 1660 return -ENODEV;
1661
1662 info->io_cleanup = mem_cleanup;
1663
c305e3d3
CM		 1664 /*
1665 * Figure out the actual readb/readw/readl/etc routine to use based
1666 * upon the register size.
1667 */
1da177e4
LT		 1668 switch (info->io.regsize) {
1669 case 1:
546cfdf4
AD		 1670 info->io.inputb = intf_mem_inb;
1671 info->io.outputb = intf_mem_outb;
1da177e4
LT		 1672 break;
1673 case 2:
546cfdf4
AD		 1674 info->io.inputb = intf_mem_inw;
1675 info->io.outputb = intf_mem_outw;
1da177e4
LT		 1676 break;
1677 case 4:
546cfdf4
AD		 1678 info->io.inputb = intf_mem_inl;
1679 info->io.outputb = intf_mem_outl;
1da177e4
LT		 1680 break;
1681#ifdef readq
1682 case 8:
1683 info->io.inputb = mem_inq;
1684 info->io.outputb = mem_outq;
1685 break;
1686#endif
1687 default:
279fbd0c
MS		 1688 dev_warn(info->dev, "Invalid register size: %d\n",
1689 info->io.regsize);
1da177e4
LT		 1690 return -EINVAL;
1691 }
1692
c305e3d3
CM		 1693 /*
1694 * Calculate the total amount of memory to claim. This is an
1da177e4
LT		 1695 * unusual looking calculation, but it avoids claiming any
1696 * more memory than it has to. It will claim everything
1697 * between the first address to the end of the last full
c305e3d3
CM		 1698 * register.
1699 */
1da177e4
LT		 1700 mapsize = ((info->io_size * info->io.regspacing)
1701 - (info->io.regspacing - info->io.regsize));
1702
b0defcdb 1703 if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL)
1da177e4
LT		 1704 return -EIO;
1705
b0defcdb 1706 info->io.addr = ioremap(addr, mapsize);
1da177e4 1707 if (info->io.addr == NULL) {
b0defcdb 1708 release_mem_region(addr, mapsize);
1da177e4
LT		 1709 return -EIO;
1710 }
1711 return 0;
1712}
1713
b361e27b
CM		 1714/*
1715 * Parms come in as <op1>[:op2[:op3...]]. ops are:
1716 * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
1717 * Options are:
1718 * rsp=<regspacing>
1719 * rsi=<regsize>
1720 * rsh=<regshift>
1721 * irq=<irq>
1722 * ipmb=<ipmb addr>
1723 */
1724enum hotmod_op { HM_ADD, HM_REMOVE };
1725struct hotmod_vals {
1726 char *name;
1727 int val;
1728};
1729static struct hotmod_vals hotmod_ops[] = {
1730 { "add", HM_ADD },
1731 { "remove", HM_REMOVE },
1732 { NULL }
1733};
1734static struct hotmod_vals hotmod_si[] = {
1735 { "kcs", SI_KCS },
1736 { "smic", SI_SMIC },
1737 { "bt", SI_BT },
1738 { NULL }
1739};
1740static struct hotmod_vals hotmod_as[] = {
1741 { "mem", IPMI_MEM_ADDR_SPACE },
1742 { "i/o", IPMI_IO_ADDR_SPACE },
1743 { NULL }
1744};
1d5636cc 1745
b361e27b
CM		 1746static int parse_str(struct hotmod_vals *v, int *val, char *name, char **curr)
1747{
1748 char *s;
1749 int i;
1750
1751 s = strchr(*curr, ',');
1752 if (!s) {
1753 printk(KERN_WARNING PFX "No hotmod %s given.\n", name);
1754 return -EINVAL;
1755 }
1756 *s = '\0';
1757 s++;
ceb51ca8 1758 for (i = 0; v[i].name; i++) {
1d5636cc 1759 if (strcmp(*curr, v[i].name) == 0) {
b361e27b
CM		 1760 *val = v[i].val;
1761 *curr = s;
1762 return 0;
1763 }
1764 }
1765
1766 printk(KERN_WARNING PFX "Invalid hotmod %s '%s'\n", name, *curr);
1767 return -EINVAL;
1768}
1769
1d5636cc
CM		 1770static int check_hotmod_int_op(const char *curr, const char *option,
1771 const char *name, int *val)
1772{
1773 char *n;
1774
1775 if (strcmp(curr, name) == 0) {
1776 if (!option) {
1777 printk(KERN_WARNING PFX
1778 "No option given for '%s'\n",
1779 curr);
1780 return -EINVAL;
1781 }
1782 *val = simple_strtoul(option, &n, 0);
1783 if ((*n != '\0') || (*option == '\0')) {
1784 printk(KERN_WARNING PFX
1785 "Bad option given for '%s'\n",
1786 curr);
1787 return -EINVAL;
1788 }
1789 return 1;
1790 }
1791 return 0;
1792}
1793
de5e2ddf
ED		 1794static struct smi_info *smi_info_alloc(void)
1795{
1796 struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
1797
f60adf42 1798 if (info)
de5e2ddf 1799 spin_lock_init(&info->si_lock);
de5e2ddf
ED		 1800 return info;
1801}
1802
b361e27b
CM		 1803static int hotmod_handler(const char *val, struct kernel_param *kp)
1804{
1805 char *str = kstrdup(val, GFP_KERNEL);
1d5636cc 1806 int rv;
b361e27b
CM		 1807 char *next, *curr, *s, *n, *o;
1808 enum hotmod_op op;
1809 enum si_type si_type;
1810 int addr_space;
1811 unsigned long addr;
1812 int regspacing;
1813 int regsize;
1814 int regshift;
1815 int irq;
1816 int ipmb;
1817 int ival;
1d5636cc 1818 int len;
b361e27b
CM		 1819 struct smi_info *info;
1820
1821 if (!str)
1822 return -ENOMEM;
1823
1824 /* Kill any trailing spaces, as we can get a "\n" from echo. */
1d5636cc
CM		 1825 len = strlen(str);
1826 ival = len - 1;
b361e27b
CM		 1827 while ((ival >= 0) && isspace(str[ival])) {
1828 str[ival] = '\0';
1829 ival--;
1830 }
1831
1832 for (curr = str; curr; curr = next) {
1833 regspacing = 1;
1834 regsize = 1;
1835 regshift = 0;
1836 irq = 0;
2f95d513 1837 ipmb = 0; /* Choose the default if not specified */
b361e27b
CM		 1838
1839 next = strchr(curr, ':');
1840 if (next) {
1841 *next = '\0';
1842 next++;
1843 }
1844
1845 rv = parse_str(hotmod_ops, &ival, "operation", &curr);
1846 if (rv)
1847 break;
1848 op = ival;
1849
1850 rv = parse_str(hotmod_si, &ival, "interface type", &curr);
1851 if (rv)
1852 break;
1853 si_type = ival;
1854
1855 rv = parse_str(hotmod_as, &addr_space, "address space", &curr);
1856 if (rv)
1857 break;
1858
1859 s = strchr(curr, ',');
1860 if (s) {
1861 *s = '\0';
1862 s++;
1863 }
1864 addr = simple_strtoul(curr, &n, 0);
1865 if ((*n != '\0') || (*curr == '\0')) {
1866 printk(KERN_WARNING PFX "Invalid hotmod address"
1867 " '%s'\n", curr);
1868 break;
1869 }
1870
1871 while (s) {
1872 curr = s;
1873 s = strchr(curr, ',');
1874 if (s) {
1875 *s = '\0';
1876 s++;
1877 }
1878 o = strchr(curr, '=');
1879 if (o) {
1880 *o = '\0';
1881 o++;
1882 }
1d5636cc
CM		 1883 rv = check_hotmod_int_op(curr, o, "rsp", &regspacing);
1884 if (rv < 0)
b361e27b 1885 goto out;
1d5636cc
CM		 1886 else if (rv)
1887 continue;
1888 rv = check_hotmod_int_op(curr, o, "rsi", &regsize);
1889 if (rv < 0)
1890 goto out;
1891 else if (rv)
1892 continue;
1893 rv = check_hotmod_int_op(curr, o, "rsh", &regshift);
1894 if (rv < 0)
1895 goto out;
1896 else if (rv)
1897 continue;
1898 rv = check_hotmod_int_op(curr, o, "irq", &irq);
1899 if (rv < 0)
1900 goto out;
1901 else if (rv)
1902 continue;
1903 rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb);
1904 if (rv < 0)
1905 goto out;
1906 else if (rv)
1907 continue;
1908
1909 rv = -EINVAL;
1910 printk(KERN_WARNING PFX
1911 "Invalid hotmod option '%s'\n",
1912 curr);
1913 goto out;
b361e27b
CM		 1914 }
1915
1916 if (op == HM_ADD) {
de5e2ddf 1917 info = smi_info_alloc();
b361e27b
CM		 1918 if (!info) {
1919 rv = -ENOMEM;
1920 goto out;
1921 }
1922
5fedc4a2 1923 info->addr_source = SI_HOTMOD;
b361e27b
CM		 1924 info->si_type = si_type;
1925 info->io.addr_data = addr;
1926 info->io.addr_type = addr_space;
1927 if (addr_space == IPMI_MEM_ADDR_SPACE)
1928 info->io_setup = mem_setup;
1929 else
1930 info->io_setup = port_setup;
1931
1932 info->io.addr = NULL;
1933 info->io.regspacing = regspacing;
1934 if (!info->io.regspacing)
1935 info->io.regspacing = DEFAULT_REGSPACING;
1936 info->io.regsize = regsize;
1937 if (!info->io.regsize)
1938 info->io.regsize = DEFAULT_REGSPACING;
1939 info->io.regshift = regshift;
1940 info->irq = irq;
1941 if (info->irq)
1942 info->irq_setup = std_irq_setup;
1943 info->slave_addr = ipmb;
1944
d02b3709
CM		 1945 rv = add_smi(info);
1946 if (rv) {
7faefea6 1947 kfree(info);
d02b3709
CM		 1948 goto out;
1949 }
1950 rv = try_smi_init(info);
1951 if (rv) {
1952 cleanup_one_si(info);
1953 goto out;
7faefea6 1954 }
b361e27b
CM		 1955 } else {
1956 /* remove */
1957 struct smi_info *e, *tmp_e;
1958
1959 mutex_lock(&smi_infos_lock);
1960 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) {
1961 if (e->io.addr_type != addr_space)
1962 continue;
1963 if (e->si_type != si_type)
1964 continue;
1965 if (e->io.addr_data == addr)
1966 cleanup_one_si(e);
1967 }
1968 mutex_unlock(&smi_infos_lock);
1969 }
1970 }
1d5636cc 1971 rv = len;
b361e27b
CM		 1972 out:
1973 kfree(str);
1974 return rv;
1975}
b0defcdb 1976
2223cbec 1977static int hardcode_find_bmc(void)
1da177e4 1978{
a1e9c9dd 1979 int ret = -ENODEV;
b0defcdb 1980 int i;
1da177e4
LT		 1981 struct smi_info *info;
1982
b0defcdb
CM		 1983 for (i = 0; i < SI_MAX_PARMS; i++) {
1984 if (!ports[i] && !addrs[i])
1985 continue;
1da177e4 1986
de5e2ddf 1987 info = smi_info_alloc();
b0defcdb 1988 if (!info)
a1e9c9dd 1989 return -ENOMEM;
1da177e4 1990
5fedc4a2 1991 info->addr_source = SI_HARDCODED;
279fbd0c 1992 printk(KERN_INFO PFX "probing via hardcoded address\n");
1da177e4 1993
1d5636cc 1994 if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) {
b0defcdb 1995 info->si_type = SI_KCS;
1d5636cc 1996 } else if (strcmp(si_type[i], "smic") == 0) {
b0defcdb 1997 info->si_type = SI_SMIC;
1d5636cc 1998 } else if (strcmp(si_type[i], "bt") == 0) {
b0defcdb
CM		 1999 info->si_type = SI_BT;
2000 } else {
279fbd0c 2001 printk(KERN_WARNING PFX "Interface type specified "
b0defcdb
CM		 2002 "for interface %d, was invalid: %s\n",
2003 i, si_type[i]);
2004 kfree(info);
2005 continue;
2006 }
1da177e4 2007
b0defcdb
CM		 2008 if (ports[i]) {
2009 /* An I/O port */
2010 info->io_setup = port_setup;
2011 info->io.addr_data = ports[i];
2012 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2013 } else if (addrs[i]) {
2014 /* A memory port */
2015 info->io_setup = mem_setup;
2016 info->io.addr_data = addrs[i];
2017 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2018 } else {
279fbd0c
MS		 2019 printk(KERN_WARNING PFX "Interface type specified "
2020 "for interface %d, but port and address were "
2021 "not set or set to zero.\n", i);
b0defcdb
CM		 2022 kfree(info);
2023 continue;
2024 }
1da177e4 2025
b0defcdb
CM		 2026 info->io.addr = NULL;
2027 info->io.regspacing = regspacings[i];
2028 if (!info->io.regspacing)
2029 info->io.regspacing = DEFAULT_REGSPACING;
2030 info->io.regsize = regsizes[i];
2031 if (!info->io.regsize)
2032 info->io.regsize = DEFAULT_REGSPACING;
2033 info->io.regshift = regshifts[i];
2034 info->irq = irqs[i];
2035 if (info->irq)
2036 info->irq_setup = std_irq_setup;
2f95d513 2037 info->slave_addr = slave_addrs[i];
1da177e4 2038
7faefea6 2039 if (!add_smi(info)) {
2407d77a
MG		 2040 if (try_smi_init(info))
2041 cleanup_one_si(info);
a1e9c9dd 2042 ret = 0;
7faefea6
YL		 2043 } else {
2044 kfree(info);
2045 }
b0defcdb 2046 }
a1e9c9dd 2047 return ret;
b0defcdb 2048}
1da177e4 2049
8466361a 2050#ifdef CONFIG_ACPI
1da177e4
LT		 2051
2052#include <linux/acpi.h>
2053
c305e3d3
CM		 2054/*
2055 * Once we get an ACPI failure, we don't try any more, because we go
2056 * through the tables sequentially. Once we don't find a table, there
2057 * are no more.
2058 */
0c8204b3 2059static int acpi_failure;
1da177e4
LT		 2060
2061/* For GPE-type interrupts. */
8b6cd8ad
LM		 2062static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
2063 u32 gpe_number, void *context)
1da177e4
LT		 2064{
2065 struct smi_info *smi_info = context;
2066 unsigned long flags;
1da177e4
LT		 2067
2068 spin_lock_irqsave(&(smi_info->si_lock), flags);
2069
64959e2d 2070 smi_inc_stat(smi_info, interrupts);
1da177e4 2071
f93aae9f
JS		 2072 debug_timestamp("ACPI_GPE");
2073
1da177e4 2074 smi_event_handler(smi_info, 0);
1da177e4
LT		 2075 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
2076
2077 return ACPI_INTERRUPT_HANDLED;
2078}
2079
b0defcdb
CM		 2080static void acpi_gpe_irq_cleanup(struct smi_info *info)
2081{
2082 if (!info->irq)
2083 return;
2084
2085 acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe);
2086}
2087
1da177e4
LT		 2088static int acpi_gpe_irq_setup(struct smi_info *info)
2089{
2090 acpi_status status;
2091
b0defcdb 2092 if (!info->irq)
1da177e4
LT		 2093 return 0;
2094
1da177e4
LT		 2095 status = acpi_install_gpe_handler(NULL,
2096 info->irq,
2097 ACPI_GPE_LEVEL_TRIGGERED,
2098 &ipmi_acpi_gpe,
2099 info);
2100 if (status != AE_OK) {
279fbd0c
MS		 2101 dev_warn(info->dev, "%s unable to claim ACPI GPE %d,"
2102 " running polled\n", DEVICE_NAME, info->irq);
1da177e4
LT		 2103 info->irq = 0;
2104 return -EINVAL;
2105 } else {
b0defcdb 2106 info->irq_cleanup = acpi_gpe_irq_cleanup;
279fbd0c 2107 dev_info(info->dev, "Using ACPI GPE %d\n", info->irq);
1da177e4
LT		 2108 return 0;
2109 }
2110}
2111
1da177e4
LT		 2112/*
2113 * Defined at
631dd1a8 2114 * http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf
1da177e4
LT		 2115 */
2116struct SPMITable {
2117 s8 Signature[4];
2118 u32 Length;
2119 u8 Revision;
2120 u8 Checksum;
2121 s8 OEMID[6];
2122 s8 OEMTableID[8];
2123 s8 OEMRevision[4];
2124 s8 CreatorID[4];
2125 s8 CreatorRevision[4];
2126 u8 InterfaceType;
2127 u8 IPMIlegacy;
2128 s16 SpecificationRevision;
2129
2130 /*
2131 * Bit 0 - SCI interrupt supported
2132 * Bit 1 - I/O APIC/SAPIC
2133 */
2134 u8 InterruptType;
2135
c305e3d3
CM		 2136 /*
2137 * If bit 0 of InterruptType is set, then this is the SCI
2138 * interrupt in the GPEx_STS register.
2139 */
1da177e4
LT		 2140 u8 GPE;
2141
2142 s16 Reserved;
2143
c305e3d3
CM		 2144 /*
2145 * If bit 1 of InterruptType is set, then this is the I/O
2146 * APIC/SAPIC interrupt.
2147 */
1da177e4
LT		 2148 u32 GlobalSystemInterrupt;
2149
2150 /* The actual register address. */
2151 struct acpi_generic_address addr;
2152
2153 u8 UID[4];
2154
2155 s8 spmi_id[1]; /* A '\0' terminated array starts here. */
2156};
2157
2223cbec 2158static int try_init_spmi(struct SPMITable *spmi)
1da177e4
LT		 2159{
2160 struct smi_info *info;
d02b3709 2161 int rv;
1da177e4 2162
1da177e4 2163 if (spmi->IPMIlegacy != 1) {
279fbd0c
MS		 2164 printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy);
2165 return -ENODEV;
1da177e4
LT		 2166 }
2167
de5e2ddf 2168 info = smi_info_alloc();
b0defcdb 2169 if (!info) {
279fbd0c 2170 printk(KERN_ERR PFX "Could not allocate SI data (3)\n");
b0defcdb
CM		 2171 return -ENOMEM;
2172 }
2173
5fedc4a2 2174 info->addr_source = SI_SPMI;
279fbd0c 2175 printk(KERN_INFO PFX "probing via SPMI\n");
1da177e4 2176
1da177e4 2177 /* Figure out the interface type. */
c305e3d3 2178 switch (spmi->InterfaceType) {
1da177e4 2179 case 1: /* KCS */
b0defcdb 2180 info->si_type = SI_KCS;
1da177e4 2181 break;
1da177e4 2182 case 2: /* SMIC */
b0defcdb 2183 info->si_type = SI_SMIC;
1da177e4 2184 break;
1da177e4 2185 case 3: /* BT */
b0defcdb 2186 info->si_type = SI_BT;
1da177e4 2187 break;
ab42bf24
CM		 2188 case 4: /* SSIF, just ignore */
2189 kfree(info);
2190 return -EIO;
1da177e4 2191 default:
279fbd0c
MS		 2192 printk(KERN_INFO PFX "Unknown ACPI/SPMI SI type %d\n",
2193 spmi->InterfaceType);
b0defcdb 2194 kfree(info);
1da177e4
LT		 2195 return -EIO;
2196 }
2197
1da177e4
LT		 2198 if (spmi->InterruptType & 1) {
2199 /* We've got a GPE interrupt. */
2200 info->irq = spmi->GPE;
2201 info->irq_setup = acpi_gpe_irq_setup;
1da177e4
LT		 2202 } else if (spmi->InterruptType & 2) {
2203 /* We've got an APIC/SAPIC interrupt. */
2204 info->irq = spmi->GlobalSystemInterrupt;
2205 info->irq_setup = std_irq_setup;
1da177e4
LT		 2206 } else {
2207 /* Use the default interrupt setting. */
2208 info->irq = 0;
2209 info->irq_setup = NULL;
2210 }
2211
15a58ed1 2212 if (spmi->addr.bit_width) {
35bc37a0 2213 /* A (hopefully) properly formed register bit width. */
15a58ed1 2214 info->io.regspacing = spmi->addr.bit_width / 8;
35bc37a0 2215 } else {
35bc37a0
CM		 2216 info->io.regspacing = DEFAULT_REGSPACING;
2217 }
b0defcdb 2218 info->io.regsize = info->io.regspacing;
15a58ed1 2219 info->io.regshift = spmi->addr.bit_offset;
1da177e4 2220
15a58ed1 2221 if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
1da177e4 2222 info->io_setup = mem_setup;
8fe1425a 2223 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
15a58ed1 2224 } else if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
1da177e4 2225 info->io_setup = port_setup;
8fe1425a 2226 info->io.addr_type = IPMI_IO_ADDR_SPACE;
1da177e4
LT		 2227 } else {
2228 kfree(info);
279fbd0c 2229 printk(KERN_WARNING PFX "Unknown ACPI I/O Address type\n");
1da177e4
LT		 2230 return -EIO;
2231 }
b0defcdb 2232 info->io.addr_data = spmi->addr.address;
1da177e4 2233
7bb671e3
YL		 2234 pr_info("ipmi_si: SPMI: %s %#lx regsize %d spacing %d irq %d\n",
2235 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2236 info->io.addr_data, info->io.regsize, info->io.regspacing,
2237 info->irq);
2238
d02b3709
CM		 2239 rv = add_smi(info);
2240 if (rv)
7faefea6 2241 kfree(info);
1da177e4 2242
d02b3709 2243 return rv;
1da177e4 2244}
b0defcdb 2245
2223cbec 2246static void spmi_find_bmc(void)
b0defcdb
CM		 2247{
2248 acpi_status status;
2249 struct SPMITable *spmi;
2250 int i;
2251
2252 if (acpi_disabled)
2253 return;
2254
2255 if (acpi_failure)
2256 return;
2257
2258 for (i = 0; ; i++) {
15a58ed1
AS		 2259 status = acpi_get_table(ACPI_SIG_SPMI, i+1,
2260 (struct acpi_table_header **)&spmi);
b0defcdb
CM		 2261 if (status != AE_OK)
2262 return;
2263
18a3e0bf 2264 try_init_spmi(spmi);
b0defcdb
CM		 2265 }
2266}
1da177e4
LT		 2267#endif
2268
a9fad4cc 2269#ifdef CONFIG_DMI
c305e3d3 2270struct dmi_ipmi_data {
1da177e4
LT		 2271 u8 type;
2272 u8 addr_space;
2273 unsigned long base_addr;
2274 u8 irq;
2275 u8 offset;
2276 u8 slave_addr;
b0defcdb 2277};
1da177e4 2278
2223cbec 2279static int decode_dmi(const struct dmi_header *dm,
b0defcdb 2280 struct dmi_ipmi_data *dmi)
1da177e4 2281{
1855256c 2282 const u8 *data = (const u8 *)dm;
1da177e4
LT		 2283 unsigned long base_addr;
2284 u8 reg_spacing;
b224cd3a 2285 u8 len = dm->length;
1da177e4 2286
b0defcdb 2287 dmi->type = data[4];
1da177e4
LT		 2288
2289 memcpy(&base_addr, data+8, sizeof(unsigned long));
2290 if (len >= 0x11) {
2291 if (base_addr & 1) {
2292 /* I/O */
2293 base_addr &= 0xFFFE;
b0defcdb 2294 dmi->addr_space = IPMI_IO_ADDR_SPACE;
c305e3d3 2295 } else
1da177e4 2296 /* Memory */
b0defcdb 2297 dmi->addr_space = IPMI_MEM_ADDR_SPACE;
c305e3d3 2298
1da177e4
LT		 2299 /* If bit 4 of byte 0x10 is set, then the lsb for the address
2300 is odd. */
b0defcdb 2301 dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
1da177e4 2302
b0defcdb 2303 dmi->irq = data[0x11];
1da177e4
LT		 2304
2305 /* The top two bits of byte 0x10 hold the register spacing. */
b224cd3a 2306 reg_spacing = (data[0x10] & 0xC0) >> 6;
c305e3d3 2307 switch (reg_spacing) {
1da177e4 2308 case 0x00: /* Byte boundaries */
b0defcdb 2309 dmi->offset = 1;
1da177e4
LT		 2310 break;
2311 case 0x01: /* 32-bit boundaries */
b0defcdb 2312 dmi->offset = 4;
1da177e4
LT		 2313 break;
2314 case 0x02: /* 16-byte boundaries */
b0defcdb 2315 dmi->offset = 16;
1da177e4
LT		 2316 break;
2317 default:
2318 /* Some other interface, just ignore it. */
2319 return -EIO;
2320 }
2321 } else {
2322 /* Old DMI spec. */
c305e3d3
CM		 2323 /*
2324 * Note that technically, the lower bit of the base
92068801
CM		 2325 * address should be 1 if the address is I/O and 0 if
2326 * the address is in memory. So many systems get that
2327 * wrong (and all that I have seen are I/O) so we just
2328 * ignore that bit and assume I/O. Systems that use
c305e3d3
CM		 2329 * memory should use the newer spec, anyway.
2330 */
b0defcdb
CM		 2331 dmi->base_addr = base_addr & 0xfffe;
2332 dmi->addr_space = IPMI_IO_ADDR_SPACE;
2333 dmi->offset = 1;
1da177e4
LT		 2334 }
2335
b0defcdb 2336 dmi->slave_addr = data[6];
1da177e4 2337
b0defcdb 2338 return 0;
1da177e4
LT		 2339}
2340
2223cbec 2341static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
1da177e4 2342{
b0defcdb 2343 struct smi_info *info;
1da177e4 2344
de5e2ddf 2345 info = smi_info_alloc();
b0defcdb 2346 if (!info) {
279fbd0c 2347 printk(KERN_ERR PFX "Could not allocate SI data\n");
b0defcdb 2348 return;
1da177e4 2349 }
1da177e4 2350
5fedc4a2 2351 info->addr_source = SI_SMBIOS;
279fbd0c 2352 printk(KERN_INFO PFX "probing via SMBIOS\n");
1da177e4 2353
e8b33617 2354 switch (ipmi_data->type) {
b0defcdb
CM		 2355 case 0x01: /* KCS */
2356 info->si_type = SI_KCS;
2357 break;
2358 case 0x02: /* SMIC */
2359 info->si_type = SI_SMIC;
2360 break;
2361 case 0x03: /* BT */
2362 info->si_type = SI_BT;
2363 break;
2364 default:
80cd6920 2365 kfree(info);
b0defcdb 2366 return;
1da177e4 2367 }
1da177e4 2368
b0defcdb
CM		 2369 switch (ipmi_data->addr_space) {
2370 case IPMI_MEM_ADDR_SPACE:
1da177e4 2371 info->io_setup = mem_setup;
b0defcdb
CM		 2372 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2373 break;
2374
2375 case IPMI_IO_ADDR_SPACE:
1da177e4 2376 info->io_setup = port_setup;
b0defcdb
CM		 2377 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2378 break;
2379
2380 default:
1da177e4 2381 kfree(info);
279fbd0c 2382 printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n",
b0defcdb
CM		 2383 ipmi_data->addr_space);
2384 return;
1da177e4 2385 }
b0defcdb 2386 info->io.addr_data = ipmi_data->base_addr;
1da177e4 2387
b0defcdb
CM		 2388 info->io.regspacing = ipmi_data->offset;
2389 if (!info->io.regspacing)
1da177e4
LT		 2390 info->io.regspacing = DEFAULT_REGSPACING;
2391 info->io.regsize = DEFAULT_REGSPACING;
b0defcdb 2392 info->io.regshift = 0;
1da177e4
LT		 2393
2394 info->slave_addr = ipmi_data->slave_addr;
2395
b0defcdb
CM		 2396 info->irq = ipmi_data->irq;
2397 if (info->irq)
2398 info->irq_setup = std_irq_setup;
1da177e4 2399
7bb671e3
YL		 2400 pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n",
2401 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2402 info->io.addr_data, info->io.regsize, info->io.regspacing,
2403 info->irq);
2404
7faefea6
YL		 2405 if (add_smi(info))
2406 kfree(info);
b0defcdb 2407}
1da177e4 2408
2223cbec 2409static void dmi_find_bmc(void)
b0defcdb 2410{
1855256c 2411 const struct dmi_device *dev = NULL;
b0defcdb
CM		 2412 struct dmi_ipmi_data data;
2413 int rv;
2414
2415 while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) {
397f4ebf 2416 memset(&data, 0, sizeof(data));
1855256c
JG		 2417 rv = decode_dmi((const struct dmi_header *) dev->device_data,
2418 &data);
b0defcdb
CM		 2419 if (!rv)
2420 try_init_dmi(&data);
2421 }
1da177e4 2422}
a9fad4cc 2423#endif /* CONFIG_DMI */
1da177e4
LT		 2424
2425#ifdef CONFIG_PCI
2426
b0defcdb
CM		 2427#define PCI_ERMC_CLASSCODE 0x0C0700
2428#define PCI_ERMC_CLASSCODE_MASK 0xffffff00
2429#define PCI_ERMC_CLASSCODE_TYPE_MASK 0xff
2430#define PCI_ERMC_CLASSCODE_TYPE_SMIC 0x00
2431#define PCI_ERMC_CLASSCODE_TYPE_KCS 0x01
2432#define PCI_ERMC_CLASSCODE_TYPE_BT 0x02
2433
1da177e4
LT		 2434#define PCI_HP_VENDOR_ID 0x103C
2435#define PCI_MMC_DEVICE_ID 0x121A
2436#define PCI_MMC_ADDR_CW 0x10
2437
b0defcdb
CM		 2438static void ipmi_pci_cleanup(struct smi_info *info)
2439{
2440 struct pci_dev *pdev = info->addr_source_data;
2441
2442 pci_disable_device(pdev);
2443}
1da177e4 2444
2223cbec 2445static int ipmi_pci_probe_regspacing(struct smi_info *info)
a6c16c28
CM		 2446{
2447 if (info->si_type == SI_KCS) {
2448 unsigned char status;
2449 int regspacing;
2450
2451 info->io.regsize = DEFAULT_REGSIZE;
2452 info->io.regshift = 0;
2453 info->io_size = 2;
2454 info->handlers = &kcs_smi_handlers;
2455
2456 /* detect 1, 4, 16byte spacing */
2457 for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
2458 info->io.regspacing = regspacing;
2459 if (info->io_setup(info)) {
2460 dev_err(info->dev,
2461 "Could not setup I/O space\n");
2462 return DEFAULT_REGSPACING;
2463 }
2464 /* write invalid cmd */
2465 info->io.outputb(&info->io, 1, 0x10);
2466 /* read status back */
2467 status = info->io.inputb(&info->io, 1);
2468 info->io_cleanup(info);
2469 if (status)
2470 return regspacing;
2471 regspacing *= 4;
2472 }
2473 }
2474 return DEFAULT_REGSPACING;
2475}
2476
2223cbec 2477static int ipmi_pci_probe(struct pci_dev *pdev,
b0defcdb 2478 const struct pci_device_id *ent)
1da177e4 2479{
b0defcdb
CM		 2480 int rv;
2481 int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
2482 struct smi_info *info;
1da177e4 2483
de5e2ddf 2484 info = smi_info_alloc();
b0defcdb 2485 if (!info)
1cd441f9 2486 return -ENOMEM;
1da177e4 2487
5fedc4a2 2488 info->addr_source = SI_PCI;
279fbd0c 2489 dev_info(&pdev->dev, "probing via PCI");
1da177e4 2490
b0defcdb
CM		 2491 switch (class_type) {
2492 case PCI_ERMC_CLASSCODE_TYPE_SMIC:
2493 info->si_type = SI_SMIC;
2494 break;
1da177e4 2495
b0defcdb
CM		 2496 case PCI_ERMC_CLASSCODE_TYPE_KCS:
2497 info->si_type = SI_KCS;
2498 break;
2499
2500 case PCI_ERMC_CLASSCODE_TYPE_BT:
2501 info->si_type = SI_BT;
2502 break;
2503
2504 default:
2505 kfree(info);
279fbd0c 2506 dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type);
1cd441f9 2507 return -ENOMEM;
1da177e4
LT		 2508 }
2509
b0defcdb
CM		 2510 rv = pci_enable_device(pdev);
2511 if (rv) {
279fbd0c 2512 dev_err(&pdev->dev, "couldn't enable PCI device\n");
b0defcdb
CM		 2513 kfree(info);
2514 return rv;
1da177e4
LT		 2515 }
2516
b0defcdb
CM		 2517 info->addr_source_cleanup = ipmi_pci_cleanup;
2518 info->addr_source_data = pdev;
1da177e4 2519
b0defcdb
CM		 2520 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
2521 info->io_setup = port_setup;
2522 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2523 } else {
2524 info->io_setup = mem_setup;
2525 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
1da177e4 2526 }
b0defcdb 2527 info->io.addr_data = pci_resource_start(pdev, 0);
1da177e4 2528
a6c16c28
CM		 2529 info->io.regspacing = ipmi_pci_probe_regspacing(info);
2530 info->io.regsize = DEFAULT_REGSIZE;
b0defcdb 2531 info->io.regshift = 0;
1da177e4 2532
b0defcdb
CM		 2533 info->irq = pdev->irq;
2534 if (info->irq)
2535 info->irq_setup = std_irq_setup;
1da177e4 2536
50c812b2 2537 info->dev = &pdev->dev;
fca3b747 2538 pci_set_drvdata(pdev, info);
50c812b2 2539
279fbd0c
MS		 2540 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
2541 &pdev->resource[0], info->io.regsize, info->io.regspacing,
2542 info->irq);
2543
d02b3709
CM		 2544 rv = add_smi(info);
2545 if (rv) {
7faefea6 2546 kfree(info);
d02b3709
CM		 2547 pci_disable_device(pdev);
2548 }
7faefea6 2549
d02b3709 2550 return rv;
b0defcdb 2551}
1da177e4 2552
39af33fc 2553static void ipmi_pci_remove(struct pci_dev *pdev)
b0defcdb 2554{
fca3b747
CM		 2555 struct smi_info *info = pci_get_drvdata(pdev);
2556 cleanup_one_si(info);
d02b3709 2557 pci_disable_device(pdev);
b0defcdb 2558}
1da177e4 2559
81d02b7f 2560static const struct pci_device_id ipmi_pci_devices[] = {
b0defcdb 2561 { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) },
248bdd5e
KC		 2562 { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) },
2563 { 0, }
b0defcdb
CM		 2564};
2565MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);
2566
2567static struct pci_driver ipmi_pci_driver = {
c305e3d3
CM		 2568 .name = DEVICE_NAME,
2569 .id_table = ipmi_pci_devices,
2570 .probe = ipmi_pci_probe,
bcd2982a 2571 .remove = ipmi_pci_remove,
b0defcdb
CM		 2572};
2573#endif /* CONFIG_PCI */
1da177e4 2574
a1e9c9dd 2575#ifdef CONFIG_OF
0fbcf4af
CM		 2576static const struct of_device_id of_ipmi_match[] = {
2577 { .type = "ipmi", .compatible = "ipmi-kcs",
2578 .data = (void *)(unsigned long) SI_KCS },
2579 { .type = "ipmi", .compatible = "ipmi-smic",
2580 .data = (void *)(unsigned long) SI_SMIC },
2581 { .type = "ipmi", .compatible = "ipmi-bt",
2582 .data = (void *)(unsigned long) SI_BT },
2583 {},
2584};
2585
2586static int of_ipmi_probe(struct platform_device *dev)
2587{
b1608d69 2588 const struct of_device_id *match;
dba9b4f6
CM		 2589 struct smi_info *info;
2590 struct resource resource;
da81c3b9 2591 const __be32 *regsize, *regspacing, *regshift;
61c7a080 2592 struct device_node *np = dev->dev.of_node;
dba9b4f6
CM		 2593 int ret;
2594 int proplen;
2595
279fbd0c 2596 dev_info(&dev->dev, "probing via device tree\n");
dba9b4f6 2597
0fbcf4af 2598 match = of_match_device(of_ipmi_match, &dev->dev);
b1608d69 2599 if (!match)
0fbcf4af 2600 return -ENODEV;
a1e9c9dd 2601
08dc4169
BH		 2602 if (!of_device_is_available(np))
2603 return -EINVAL;
2604
dba9b4f6
CM		 2605 ret = of_address_to_resource(np, 0, &resource);
2606 if (ret) {
2607 dev_warn(&dev->dev, PFX "invalid address from OF\n");
2608 return ret;
2609 }
2610
9c25099d 2611 regsize = of_get_property(np, "reg-size", &proplen);
dba9b4f6
CM		 2612 if (regsize && proplen != 4) {
2613 dev_warn(&dev->dev, PFX "invalid regsize from OF\n");
2614 return -EINVAL;
2615 }
2616
9c25099d 2617 regspacing = of_get_property(np, "reg-spacing", &proplen);
dba9b4f6
CM		 2618 if (regspacing && proplen != 4) {
2619 dev_warn(&dev->dev, PFX "invalid regspacing from OF\n");
2620 return -EINVAL;
2621 }
2622
9c25099d 2623 regshift = of_get_property(np, "reg-shift", &proplen);
dba9b4f6
CM		 2624 if (regshift && proplen != 4) {
2625 dev_warn(&dev->dev, PFX "invalid regshift from OF\n");
2626 return -EINVAL;
2627 }
2628
de5e2ddf 2629 info = smi_info_alloc();
dba9b4f6
CM		 2630
2631 if (!info) {
2632 dev_err(&dev->dev,
279fbd0c 2633 "could not allocate memory for OF probe\n");
dba9b4f6
CM		 2634 return -ENOMEM;
2635 }
2636
b1608d69 2637 info->si_type = (enum si_type) match->data;
5fedc4a2 2638 info->addr_source = SI_DEVICETREE;
dba9b4f6
CM		 2639 info->irq_setup = std_irq_setup;
2640
3b7ec117
NC		 2641 if (resource.flags & IORESOURCE_IO) {
2642 info->io_setup = port_setup;
2643 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2644 } else {
2645 info->io_setup = mem_setup;
2646 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2647 }
2648
dba9b4f6
CM		 2649 info->io.addr_data = resource.start;
2650
da81c3b9
RH		 2651 info->io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
2652 info->io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
2653 info->io.regshift = regshift ? be32_to_cpup(regshift) : 0;
dba9b4f6 2654
61c7a080 2655 info->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
dba9b4f6
CM		 2656 info->dev = &dev->dev;
2657
279fbd0c 2658 dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
dba9b4f6
CM		 2659 info->io.addr_data, info->io.regsize, info->io.regspacing,
2660 info->irq);
2661
9de33df4 2662 dev_set_drvdata(&dev->dev, info);
dba9b4f6 2663
d02b3709
CM		 2664 ret = add_smi(info);
2665 if (ret) {
7faefea6 2666 kfree(info);
d02b3709 2667 return ret;
7faefea6 2668 }
7faefea6 2669 return 0;
dba9b4f6 2670}
acbd9ae7 2671MODULE_DEVICE_TABLE(of, of_ipmi_match);
0fbcf4af
CM		 2672#else
2673#define of_ipmi_match NULL
2674static int of_ipmi_probe(struct platform_device *dev)
2675{
2676 return -ENODEV;
2677}
2678#endif
dba9b4f6 2679
0fbcf4af
CM		 2680#ifdef CONFIG_ACPI
2681static int acpi_ipmi_probe(struct platform_device *dev)
dba9b4f6 2682{
0fbcf4af
CM		 2683 struct smi_info *info;
2684 struct resource *res, *res_second;
2685 acpi_handle handle;
2686 acpi_status status;
2687 unsigned long long tmp;
2688 int rv = -EINVAL;
2689
2690 handle = ACPI_HANDLE(&dev->dev);
2691 if (!handle)
2692 return -ENODEV;
2693
2694 info = smi_info_alloc();
2695 if (!info)
2696 return -ENOMEM;
2697
2698 info->addr_source = SI_ACPI;
2699 dev_info(&dev->dev, PFX "probing via ACPI\n");
2700
2701 info->addr_info.acpi_info.acpi_handle = handle;
2702
2703 /* _IFT tells us the interface type: KCS, BT, etc */
2704 status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
2705 if (ACPI_FAILURE(status)) {
2706 dev_err(&dev->dev, "Could not find ACPI IPMI interface type\n");
2707 goto err_free;
2708 }
2709
2710 switch (tmp) {
2711 case 1:
2712 info->si_type = SI_KCS;
2713 break;
2714 case 2:
2715 info->si_type = SI_SMIC;
2716 break;
2717 case 3:
2718 info->si_type = SI_BT;
2719 break;
2720 case 4: /* SSIF, just ignore */
2721 rv = -ENODEV;
2722 goto err_free;
2723 default:
2724 dev_info(&dev->dev, "unknown IPMI type %lld\n", tmp);
2725 goto err_free;
2726 }
2727
2728 res = platform_get_resource(dev, IORESOURCE_IO, 0);
2729 if (res) {
2730 info->io_setup = port_setup;
2731 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2732 } else {
2733 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
2734 if (res) {
2735 info->io_setup = mem_setup;
2736 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2737 }
2738 }
2739 if (!res) {
2740 dev_err(&dev->dev, "no I/O or memory address\n");
2741 goto err_free;
2742 }
2743 info->io.addr_data = res->start;
2744
2745 info->io.regspacing = DEFAULT_REGSPACING;
2746 res_second = platform_get_resource(dev,
2747 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ?
2748 IORESOURCE_IO : IORESOURCE_MEM,
2749 1);
2750 if (res_second) {
2751 if (res_second->start > info->io.addr_data)
2752 info->io.regspacing =
2753 res_second->start - info->io.addr_data;
2754 }
2755 info->io.regsize = DEFAULT_REGSPACING;
2756 info->io.regshift = 0;
2757
2758 /* If _GPE exists, use it; otherwise use standard interrupts */
2759 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
2760 if (ACPI_SUCCESS(status)) {
2761 info->irq = tmp;
2762 info->irq_setup = acpi_gpe_irq_setup;
2763 } else {
2764 int irq = platform_get_irq(dev, 0);
2765
2766 if (irq > 0) {
2767 info->irq = irq;
2768 info->irq_setup = std_irq_setup;
2769 }
2770 }
2771
2772 info->dev = &dev->dev;
2773 platform_set_drvdata(dev, info);
2774
2775 dev_info(info->dev, "%pR regsize %d spacing %d irq %d\n",
2776 res, info->io.regsize, info->io.regspacing,
2777 info->irq);
2778
2779 rv = add_smi(info);
2780 if (rv)
2781 kfree(info);
2782
2783 return rv;
2784
2785err_free:
2786 kfree(info);
2787 return rv;
2788}
2789
81d02b7f 2790static const struct acpi_device_id acpi_ipmi_match[] = {
0fbcf4af
CM		 2791 { "IPI0001", 0 },
2792 { },
2793};
2794MODULE_DEVICE_TABLE(acpi, acpi_ipmi_match);
2795#else
2796static int acpi_ipmi_probe(struct platform_device *dev)
2797{
2798 return -ENODEV;
2799}
a1e9c9dd 2800#endif
0fbcf4af
CM		 2801
2802static int ipmi_probe(struct platform_device *dev)
2803{
2804 if (of_ipmi_probe(dev) == 0)
2805 return 0;
2806
2807 return acpi_ipmi_probe(dev);
dba9b4f6
CM		 2808}
2809
0fbcf4af 2810static int ipmi_remove(struct platform_device *dev)
dba9b4f6 2811{
0fbcf4af
CM		 2812 struct smi_info *info = dev_get_drvdata(&dev->dev);
2813
a7930899 2814 cleanup_one_si(info);
0fbcf4af
CM		 2815 return 0;
2816}
dba9b4f6 2817
a1e9c9dd 2818static struct platform_driver ipmi_driver = {
4018294b 2819 .driver = {
a1e9c9dd 2820 .name = DEVICE_NAME,
0fbcf4af
CM		 2821 .of_match_table = of_ipmi_match,
2822 .acpi_match_table = ACPI_PTR(acpi_ipmi_match),
4018294b 2823 },
a1e9c9dd 2824 .probe = ipmi_probe,
bcd2982a 2825 .remove = ipmi_remove,
dba9b4f6 2826};
dba9b4f6 2827
fdbeb7de
TB		 2828#ifdef CONFIG_PARISC
2829static int ipmi_parisc_probe(struct parisc_device *dev)
2830{
2831 struct smi_info *info;
dfa19426 2832 int rv;
fdbeb7de
TB		 2833
2834 info = smi_info_alloc();
2835
2836 if (!info) {
2837 dev_err(&dev->dev,
2838 "could not allocate memory for PARISC probe\n");
2839 return -ENOMEM;
2840 }
2841
2842 info->si_type = SI_KCS;
2843 info->addr_source = SI_DEVICETREE;
2844 info->io_setup = mem_setup;
2845 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2846 info->io.addr_data = dev->hpa.start;
2847 info->io.regsize = 1;
2848 info->io.regspacing = 1;
2849 info->io.regshift = 0;
2850 info->irq = 0; /* no interrupt */
2851 info->irq_setup = NULL;
2852 info->dev = &dev->dev;
2853
2854 dev_dbg(&dev->dev, "addr 0x%lx\n", info->io.addr_data);
2855
2856 dev_set_drvdata(&dev->dev, info);
2857
d02b3709
CM		 2858 rv = add_smi(info);
2859 if (rv) {
fdbeb7de 2860 kfree(info);
d02b3709 2861 return rv;
fdbeb7de
TB		 2862 }
2863
2864 return 0;
2865}
2866
2867static int ipmi_parisc_remove(struct parisc_device *dev)
2868{
2869 cleanup_one_si(dev_get_drvdata(&dev->dev));
2870 return 0;
2871}
2872
2873static struct parisc_device_id ipmi_parisc_tbl[] = {
2874 { HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 },
2875 { 0, }
2876};
2877
2878static struct parisc_driver ipmi_parisc_driver = {
2879 .name = "ipmi",
2880 .id_table = ipmi_parisc_tbl,
2881 .probe = ipmi_parisc_probe,
2882 .remove = ipmi_parisc_remove,
2883};
2884#endif /* CONFIG_PARISC */
2885
40112ae7 2886static int wait_for_msg_done(struct smi_info *smi_info)
1da177e4 2887{
50c812b2 2888 enum si_sm_result smi_result;
1da177e4
LT		 2889
2890 smi_result = smi_info->handlers->event(smi_info->si_sm, 0);
c305e3d3 2891 for (;;) {
c3e7e791
CM		 2892 if (smi_result == SI_SM_CALL_WITH_DELAY ||
2893 smi_result == SI_SM_CALL_WITH_TICK_DELAY) {
da4cd8df 2894 schedule_timeout_uninterruptible(1);
1da177e4 2895 smi_result = smi_info->handlers->event(
e21404dc 2896 smi_info->si_sm, jiffies_to_usecs(1));
c305e3d3 2897 } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) {
1da177e4
LT		 2898 smi_result = smi_info->handlers->event(
2899 smi_info->si_sm, 0);
c305e3d3 2900 } else
1da177e4
LT		 2901 break;
2902 }
40112ae7 2903 if (smi_result == SI_SM_HOSED)
c305e3d3
CM		 2904 /*
2905 * We couldn't get the state machine to run, so whatever's at
2906 * the port is probably not an IPMI SMI interface.
2907 */
40112ae7
CM		 2908 return -ENODEV;
2909
2910 return 0;
2911}
2912
2913static int try_get_dev_id(struct smi_info *smi_info)
2914{
2915 unsigned char msg[2];
2916 unsigned char *resp;
2917 unsigned long resp_len;
2918 int rv = 0;
2919
2920 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2921 if (!resp)
2922 return -ENOMEM;
2923
2924 /*
2925 * Do a Get Device ID command, since it comes back with some
2926 * useful info.
2927 */
2928 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2929 msg[1] = IPMI_GET_DEVICE_ID_CMD;
2930 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2931
2932 rv = wait_for_msg_done(smi_info);
2933 if (rv)
1da177e4 2934 goto out;
1da177e4 2935
1da177e4
LT		 2936 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2937 resp, IPMI_MAX_MSG_LENGTH);
1da177e4 2938
d8c98618
CM		 2939 /* Check and record info from the get device id, in case we need it. */
2940 rv = ipmi_demangle_device_id(resp, resp_len, &smi_info->device_id);
1da177e4
LT		 2941
2942 out:
2943 kfree(resp);
2944 return rv;
2945}
2946
d0882897 2947static int get_global_enables(struct smi_info *smi_info, u8 *enables)
1e7d6a45
CM		 2948{
2949 unsigned char msg[3];
2950 unsigned char *resp;
2951 unsigned long resp_len;
2952 int rv;
2953
2954 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
d0882897
CM		 2955 if (!resp)
2956 return -ENOMEM;
1e7d6a45
CM		 2957
2958 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2959 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
2960 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2961
2962 rv = wait_for_msg_done(smi_info);
2963 if (rv) {
d0882897
CM		 2964 dev_warn(smi_info->dev,
2965 "Error getting response from get global enables command: %d\n",
2966 rv);
1e7d6a45
CM		 2967 goto out;
2968 }
2969
2970 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2971 resp, IPMI_MAX_MSG_LENGTH);
2972
2973 if (resp_len < 4 ||
2974 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2975 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
2976 resp[2] != 0) {
d0882897
CM		 2977 dev_warn(smi_info->dev,
2978 "Invalid return from get global enables command: %ld %x %x %x\n",
2979 resp_len, resp[0], resp[1], resp[2]);
1e7d6a45
CM		 2980 rv = -EINVAL;
2981 goto out;
d0882897
CM		 2982 } else {
2983 *enables = resp[3];
1e7d6a45
CM		 2984 }
2985
d0882897
CM		 2986out:
2987 kfree(resp);
2988 return rv;
2989}
2990
2991/*
2992 * Returns 1 if it gets an error from the command.
2993 */
2994static int set_global_enables(struct smi_info *smi_info, u8 enables)
2995{
2996 unsigned char msg[3];
2997 unsigned char *resp;
2998 unsigned long resp_len;
2999 int rv;
3000
3001 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
3002 if (!resp)
3003 return -ENOMEM;
1e7d6a45
CM		 3004
3005 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
3006 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
d0882897 3007 msg[2] = enables;
1e7d6a45
CM		 3008 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
3009
3010 rv = wait_for_msg_done(smi_info);
3011 if (rv) {
d0882897
CM		 3012 dev_warn(smi_info->dev,
3013 "Error getting response from set global enables command: %d\n",
3014 rv);
1e7d6a45
CM		 3015 goto out;
3016 }
3017
3018 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
3019 resp, IPMI_MAX_MSG_LENGTH);
3020
3021 if (resp_len < 3 ||
3022 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
3023 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
d0882897
CM		 3024 dev_warn(smi_info->dev,
3025 "Invalid return from set global enables command: %ld %x %x\n",
3026 resp_len, resp[0], resp[1]);
1e7d6a45
CM		 3027 rv = -EINVAL;
3028 goto out;
3029 }
3030
d0882897
CM		 3031 if (resp[2] != 0)
3032 rv = 1;
3033
3034out:
3035 kfree(resp);
3036 return rv;
3037}
3038
3039/*
3040 * Some BMCs do not support clearing the receive irq bit in the global
3041 * enables (even if they don't support interrupts on the BMC). Check
3042 * for this and handle it properly.
3043 */
3044static void check_clr_rcv_irq(struct smi_info *smi_info)
3045{
3046 u8 enables = 0;
3047 int rv;
3048
3049 rv = get_global_enables(smi_info, &enables);
3050 if (!rv) {
3051 if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0)
3052 /* Already clear, should work ok. */
3053 return;
3054
3055 enables &= ~IPMI_BMC_RCV_MSG_INTR;
3056 rv = set_global_enables(smi_info, enables);
3057 }
3058
3059 if (rv < 0) {
3060 dev_err(smi_info->dev,
3061 "Cannot check clearing the rcv irq: %d\n", rv);
3062 return;
3063 }
3064
3065 if (rv) {
1e7d6a45
CM		 3066 /*
3067 * An error when setting the event buffer bit means
3068 * clearing the bit is not supported.
3069 */
d0882897
CM		 3070 dev_warn(smi_info->dev,
3071 "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n");
3072 smi_info->cannot_disable_irq = true;
3073 }
3074}
3075
3076/*
3077 * Some BMCs do not support setting the interrupt bits in the global
3078 * enables even if they support interrupts. Clearly bad, but we can
3079 * compensate.
3080 */
3081static void check_set_rcv_irq(struct smi_info *smi_info)
3082{
3083 u8 enables = 0;
3084 int rv;
3085
3086 if (!smi_info->irq)
3087 return;
3088
3089 rv = get_global_enables(smi_info, &enables);
3090 if (!rv) {
3091 enables |= IPMI_BMC_RCV_MSG_INTR;
3092 rv = set_global_enables(smi_info, enables);
3093 }
3094
3095 if (rv < 0) {
3096 dev_err(smi_info->dev,
3097 "Cannot check setting the rcv irq: %d\n", rv);
3098 return;
3099 }
3100
3101 if (rv) {
3102 /*
3103 * An error when setting the event buffer bit means
3104 * setting the bit is not supported.
3105 */
3106 dev_warn(smi_info->dev,
3107 "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n");
3108 smi_info->cannot_disable_irq = true;
3109 smi_info->irq_enable_broken = true;
1e7d6a45 3110 }
1e7d6a45
CM		 3111}
3112
40112ae7
CM		 3113static int try_enable_event_buffer(struct smi_info *smi_info)
3114{
3115 unsigned char msg[3];
3116 unsigned char *resp;
3117 unsigned long resp_len;
3118 int rv = 0;
3119
3120 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
3121 if (!resp)
3122 return -ENOMEM;
3123
3124 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
3125 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
3126 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
3127
3128 rv = wait_for_msg_done(smi_info);
3129 if (rv) {
279fbd0c
MS		 3130 printk(KERN_WARNING PFX "Error getting response from get"
3131 " global enables command, the event buffer is not"
40112ae7
CM		 3132 " enabled.\n");
3133 goto out;
3134 }
3135
3136 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
3137 resp, IPMI_MAX_MSG_LENGTH);
3138
3139 if (resp_len < 4 ||
3140 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
3141 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
3142 resp[2] != 0) {
279fbd0c
MS		 3143 printk(KERN_WARNING PFX "Invalid return from get global"
3144 " enables command, cannot enable the event buffer.\n");
40112ae7
CM		 3145 rv = -EINVAL;
3146 goto out;
3147 }
3148
d9b7e4f7 3149 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
40112ae7 3150 /* buffer is already enabled, nothing to do. */
d9b7e4f7 3151 smi_info->supports_event_msg_buff = true;
40112ae7 3152 goto out;
d9b7e4f7 3153 }
40112ae7
CM		 3154
3155 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
3156 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
3157 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF;
3158 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
3159
3160 rv = wait_for_msg_done(smi_info);
3161 if (rv) {
279fbd0c
MS		 3162 printk(KERN_WARNING PFX "Error getting response from set"
3163 " global, enables command, the event buffer is not"
40112ae7
CM		 3164 " enabled.\n");
3165 goto out;
3166 }
3167
3168 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
3169 resp, IPMI_MAX_MSG_LENGTH);
3170
3171 if (resp_len < 3 ||
3172 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
3173 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
279fbd0c
MS		 3174 printk(KERN_WARNING PFX "Invalid return from get global,"
3175 "enables command, not enable the event buffer.\n");
40112ae7
CM		 3176 rv = -EINVAL;
3177 goto out;
3178 }
3179
3180 if (resp[2] != 0)
3181 /*
3182 * An error when setting the event buffer bit means
3183 * that the event buffer is not supported.
3184 */
3185 rv = -ENOENT;
d9b7e4f7
CM		 3186 else
3187 smi_info->supports_event_msg_buff = true;
3188
40112ae7
CM		 3189 out:
3190 kfree(resp);
3191 return rv;
3192}
3193
07412736 3194static int smi_type_proc_show(struct seq_file *m, void *v)
1da177e4 3195{
07412736 3196 struct smi_info *smi = m->private;
1da177e4 3197
d6c5dc18
JP		 3198 seq_printf(m, "%s\n", si_to_str[smi->si_type]);
3199
5e33cd0c 3200 return 0;
1da177e4
LT		 3201}
3202
07412736 3203static int smi_type_proc_open(struct inode *inode, struct file *file)
1da177e4 3204{
d9dda78b 3205 return single_open(file, smi_type_proc_show, PDE_DATA(inode));
07412736
AD		 3206}
3207
3208static const struct file_operations smi_type_proc_ops = {
3209 .open = smi_type_proc_open,
3210 .read = seq_read,
3211 .llseek = seq_lseek,
3212 .release = single_release,
3213};
3214
3215static int smi_si_stats_proc_show(struct seq_file *m, void *v)
3216{
3217 struct smi_info *smi = m->private;
1da177e4 3218
07412736 3219 seq_printf(m, "interrupts_enabled: %d\n",
b0defcdb 3220 smi->irq && !smi->interrupt_disabled);
07412736 3221 seq_printf(m, "short_timeouts: %u\n",
64959e2d 3222 smi_get_stat(smi, short_timeouts));
07412736 3223 seq_printf(m, "long_timeouts: %u\n",
64959e2d 3224 smi_get_stat(smi, long_timeouts));
07412736 3225 seq_printf(m, "idles: %u\n",
64959e2d 3226 smi_get_stat(smi, idles));
07412736 3227 seq_printf(m, "interrupts: %u\n",
64959e2d 3228 smi_get_stat(smi, interrupts));
07412736 3229 seq_printf(m, "attentions: %u\n",
64959e2d 3230 smi_get_stat(smi, attentions));
07412736 3231 seq_printf(m, "flag_fetches: %u\n",
64959e2d 3232 smi_get_stat(smi, flag_fetches));
07412736 3233 seq_printf(m, "hosed_count: %u\n",
64959e2d 3234 smi_get_stat(smi, hosed_count));
07412736 3235 seq_printf(m, "complete_transactions: %u\n",
64959e2d 3236 smi_get_stat(smi, complete_transactions));
07412736 3237 seq_printf(m, "events: %u\n",
64959e2d 3238 smi_get_stat(smi, events));
07412736 3239 seq_printf(m, "watchdog_pretimeouts: %u\n",
64959e2d 3240 smi_get_stat(smi, watchdog_pretimeouts));
07412736 3241 seq_printf(m, "incoming_messages: %u\n",
64959e2d 3242 smi_get_stat(smi, incoming_messages));
07412736
AD		 3243 return 0;
3244}
1da177e4 3245
07412736
AD		 3246static int smi_si_stats_proc_open(struct inode *inode, struct file *file)
3247{
d9dda78b 3248 return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode));
b361e27b
CM		 3249}
3250
07412736
AD		 3251static const struct file_operations smi_si_stats_proc_ops = {
3252 .open = smi_si_stats_proc_open,
3253 .read = seq_read,
3254 .llseek = seq_lseek,
3255 .release = single_release,
3256};
3257
3258static int smi_params_proc_show(struct seq_file *m, void *v)
b361e27b 3259{
07412736 3260 struct smi_info *smi = m->private;
b361e27b 3261
d6c5dc18
JP		 3262 seq_printf(m,
3263 "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n",
3264 si_to_str[smi->si_type],
3265 addr_space_to_str[smi->io.addr_type],
3266 smi->io.addr_data,
3267 smi->io.regspacing,
3268 smi->io.regsize,
3269 smi->io.regshift,
3270 smi->irq,
3271 smi->slave_addr);
3272
5e33cd0c 3273 return 0;
1da177e4
LT		 3274}
3275
07412736
AD		 3276static int smi_params_proc_open(struct inode *inode, struct file *file)
3277{
d9dda78b 3278 return single_open(file, smi_params_proc_show, PDE_DATA(inode));
07412736
AD		 3279}
3280
3281static const struct file_operations smi_params_proc_ops = {
3282 .open = smi_params_proc_open,
3283 .read = seq_read,
3284 .llseek = seq_lseek,
3285 .release = single_release,
3286};
3287
3ae0e0f9
CM		 3288/*
3289 * oem_data_avail_to_receive_msg_avail
3290 * @info - smi_info structure with msg_flags set
3291 *
3292 * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL
3293 * Returns 1 indicating need to re-run handle_flags().
3294 */
3295static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info)
3296{
e8b33617 3297 smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) |
c305e3d3 3298 RECEIVE_MSG_AVAIL);
3ae0e0f9
CM		 3299 return 1;
3300}
3301
3302/*
3303 * setup_dell_poweredge_oem_data_handler
3304 * @info - smi_info.device_id must be populated
3305 *
3306 * Systems that match, but have firmware version < 1.40 may assert
3307 * OEM0_DATA_AVAIL on their own, without being told via Set Flags that
3308 * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL
3309 * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags
3310 * as RECEIVE_MSG_AVAIL instead.
3311 *
3312 * As Dell has no plans to release IPMI 1.5 firmware that *ever*
3313 * assert the OEM[012] bits, and if it did, the driver would have to
3314 * change to handle that properly, we don't actually check for the
3315 * firmware version.
3316 * Device ID = 0x20 BMC on PowerEdge 8G servers
3317 * Device Revision = 0x80
3318 * Firmware Revision1 = 0x01 BMC version 1.40
3319 * Firmware Revision2 = 0x40 BCD encoded
3320 * IPMI Version = 0x51 IPMI 1.5
3321 * Manufacturer ID = A2 02 00 Dell IANA
3322 *
d5a2b89a
CM		 3323 * Additionally, PowerEdge systems with IPMI < 1.5 may also assert
3324 * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL.
3325 *
3ae0e0f9
CM		 3326 */
3327#define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20
3328#define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80
3329#define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51
50c812b2 3330#define DELL_IANA_MFR_ID 0x0002a2
3ae0e0f9
CM		 3331static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info)
3332{
3333 struct ipmi_device_id *id = &smi_info->device_id;
50c812b2 3334 if (id->manufacturer_id == DELL_IANA_MFR_ID) {
d5a2b89a
CM		 3335 if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID &&
3336 id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV &&
50c812b2 3337 id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) {
d5a2b89a
CM		 3338 smi_info->oem_data_avail_handler =
3339 oem_data_avail_to_receive_msg_avail;
c305e3d3
CM		 3340 } else if (ipmi_version_major(id) < 1 ||
3341 (ipmi_version_major(id) == 1 &&
3342 ipmi_version_minor(id) < 5)) {
d5a2b89a
CM		 3343 smi_info->oem_data_avail_handler =
3344 oem_data_avail_to_receive_msg_avail;
3345 }
3ae0e0f9
CM		 3346 }
3347}
3348
ea94027b
CM		 3349#define CANNOT_RETURN_REQUESTED_LENGTH 0xCA
3350static void return_hosed_msg_badsize(struct smi_info *smi_info)
3351{
3352 struct ipmi_smi_msg *msg = smi_info->curr_msg;
3353
25985edc 3354 /* Make it a response */
ea94027b
CM		 3355 msg->rsp[0] = msg->data[0] | 4;
3356 msg->rsp[1] = msg->data[1];
3357 msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH;
3358 msg->rsp_size = 3;
3359 smi_info->curr_msg = NULL;
3360 deliver_recv_msg(smi_info, msg);
3361}
3362
3363/*
3364 * dell_poweredge_bt_xaction_handler
3365 * @info - smi_info.device_id must be populated
3366 *
3367 * Dell PowerEdge servers with the BT interface (x6xx and 1750) will
3368 * not respond to a Get SDR command if the length of the data
3369 * requested is exactly 0x3A, which leads to command timeouts and no
3370 * data returned. This intercepts such commands, and causes userspace
3371 * callers to try again with a different-sized buffer, which succeeds.
3372 */
3373
3374#define STORAGE_NETFN 0x0A
3375#define STORAGE_CMD_GET_SDR 0x23
3376static int dell_poweredge_bt_xaction_handler(struct notifier_block *self,
3377 unsigned long unused,
3378 void *in)
3379{
3380 struct smi_info *smi_info = in;
3381 unsigned char *data = smi_info->curr_msg->data;
3382 unsigned int size = smi_info->curr_msg->data_size;
3383 if (size >= 8 &&
3384 (data[0]>>2) == STORAGE_NETFN &&
3385 data[1] == STORAGE_CMD_GET_SDR &&
3386 data[7] == 0x3A) {
3387 return_hosed_msg_badsize(smi_info);
3388 return NOTIFY_STOP;
3389 }
3390 return NOTIFY_DONE;
3391}
3392
3393static struct notifier_block dell_poweredge_bt_xaction_notifier = {
3394 .notifier_call = dell_poweredge_bt_xaction_handler,
3395};
3396
3397/*
3398 * setup_dell_poweredge_bt_xaction_handler
3399 * @info - smi_info.device_id must be filled in already
3400 *
3401 * Fills in smi_info.device_id.start_transaction_pre_hook
3402 * when we know what function to use there.
3403 */
3404static void
3405setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info)
3406{
3407 struct ipmi_device_id *id = &smi_info->device_id;
50c812b2 3408 if (id->manufacturer_id == DELL_IANA_MFR_ID &&
ea94027b
CM		 3409 smi_info->si_type == SI_BT)
3410 register_xaction_notifier(&dell_poweredge_bt_xaction_notifier);
3411}
3412
3ae0e0f9
CM		 3413/*
3414 * setup_oem_data_handler
3415 * @info - smi_info.device_id must be filled in already
3416 *
3417 * Fills in smi_info.device_id.oem_data_available_handler
3418 * when we know what function to use there.
3419 */
3420
3421static void setup_oem_data_handler(struct smi_info *smi_info)
3422{
3423 setup_dell_poweredge_oem_data_handler(smi_info);
3424}
3425
ea94027b
CM		 3426static void setup_xaction_handlers(struct smi_info *smi_info)
3427{
3428 setup_dell_poweredge_bt_xaction_handler(smi_info);
3429}
3430
d0882897
CM		 3431static void check_for_broken_irqs(struct smi_info *smi_info)
3432{
3433 check_clr_rcv_irq(smi_info);
3434 check_set_rcv_irq(smi_info);
3435}
3436
a9a2c44f
CM		 3437static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
3438{
b874b985
CM		 3439 if (smi_info->thread != NULL)
3440 kthread_stop(smi_info->thread);
3441 if (smi_info->timer_running)
453823ba 3442 del_timer_sync(&smi_info->si_timer);
a9a2c44f
CM		 3443}
3444
81d02b7f 3445static const struct ipmi_default_vals
b0defcdb
CM		 3446{
3447 int type;
3448 int port;
7420884c 3449} ipmi_defaults[] =
b0defcdb
CM		 3450{
3451 { .type = SI_KCS, .port = 0xca2 },
3452 { .type = SI_SMIC, .port = 0xca9 },
3453 { .type = SI_BT, .port = 0xe4 },
3454 { .port = 0 }
3455};
3456
2223cbec 3457static void default_find_bmc(void)
b0defcdb
CM		 3458{
3459 struct smi_info *info;
3460 int i;
3461
3462 for (i = 0; ; i++) {
3463 if (!ipmi_defaults[i].port)
3464 break;
68e1ee62 3465#ifdef CONFIG_PPC
4ff31d77
CK		 3466 if (check_legacy_ioport(ipmi_defaults[i].port))
3467 continue;
3468#endif
de5e2ddf 3469 info = smi_info_alloc();
a09f4855
AM		 3470 if (!info)
3471 return;
4ff31d77 3472
5fedc4a2 3473 info->addr_source = SI_DEFAULT;
b0defcdb
CM		 3474
3475 info->si_type = ipmi_defaults[i].type;
3476 info->io_setup = port_setup;
3477 info->io.addr_data = ipmi_defaults[i].port;
3478 info->io.addr_type = IPMI_IO_ADDR_SPACE;
3479
3480 info->io.addr = NULL;
3481 info->io.regspacing = DEFAULT_REGSPACING;
3482 info->io.regsize = DEFAULT_REGSPACING;
3483 info->io.regshift = 0;
3484
2407d77a
MG		 3485 if (add_smi(info) == 0) {
3486 if ((try_smi_init(info)) == 0) {
3487 /* Found one... */
279fbd0c 3488 printk(KERN_INFO PFX "Found default %s"
2407d77a
MG		 3489 " state machine at %s address 0x%lx\n",
3490 si_to_str[info->si_type],
3491 addr_space_to_str[info->io.addr_type],
3492 info->io.addr_data);
3493 } else
3494 cleanup_one_si(info);
7faefea6
YL		 3495 } else {
3496 kfree(info);
b0defcdb
CM		 3497 }
3498 }
3499}
3500
3501static int is_new_interface(struct smi_info *info)
1da177e4 3502{
b0defcdb 3503 struct smi_info *e;
1da177e4 3504
b0defcdb
CM		 3505 list_for_each_entry(e, &smi_infos, link) {
3506 if (e->io.addr_type != info->io.addr_type)
3507 continue;
3508 if (e->io.addr_data == info->io.addr_data)
3509 return 0;
3510 }
1da177e4 3511
b0defcdb
CM		 3512 return 1;
3513}
1da177e4 3514
2407d77a 3515static int add_smi(struct smi_info *new_smi)
b0defcdb 3516{
2407d77a 3517 int rv = 0;
b0defcdb 3518
279fbd0c 3519 printk(KERN_INFO PFX "Adding %s-specified %s state machine",
7e50387b
CM		 3520 ipmi_addr_src_to_str(new_smi->addr_source),
3521 si_to_str[new_smi->si_type]);
d6dfd131 3522 mutex_lock(&smi_infos_lock);
b0defcdb 3523 if (!is_new_interface(new_smi)) {
7bb671e3 3524 printk(KERN_CONT " duplicate interface\n");
b0defcdb
CM		 3525 rv = -EBUSY;
3526 goto out_err;
3527 }
1da177e4 3528
2407d77a
MG		 3529 printk(KERN_CONT "\n");
3530
1da177e4
LT		 3531 /* So we know not to free it unless we have allocated one. */
3532 new_smi->intf = NULL;
3533 new_smi->si_sm = NULL;
3534 new_smi->handlers = NULL;
3535
2407d77a
MG		 3536 list_add_tail(&new_smi->link, &smi_infos);
3537
3538out_err:
3539 mutex_unlock(&smi_infos_lock);
3540 return rv;
3541}
3542
3543static int try_smi_init(struct smi_info *new_smi)
3544{
3545 int rv = 0;
3546 int i;
3547
279fbd0c 3548 printk(KERN_INFO PFX "Trying %s-specified %s state"
2407d77a
MG		 3549 " machine at %s address 0x%lx, slave address 0x%x,"
3550 " irq %d\n",
7e50387b 3551 ipmi_addr_src_to_str(new_smi->addr_source),
2407d77a
MG		 3552 si_to_str[new_smi->si_type],
3553 addr_space_to_str[new_smi->io.addr_type],
3554 new_smi->io.addr_data,
3555 new_smi->slave_addr, new_smi->irq);
3556
b0defcdb
CM		 3557 switch (new_smi->si_type) {
3558 case SI_KCS:
1da177e4 3559 new_smi->handlers = &kcs_smi_handlers;
b0defcdb
CM		 3560 break;
3561
3562 case SI_SMIC:
1da177e4 3563 new_smi->handlers = &smic_smi_handlers;
b0defcdb
CM		 3564 break;
3565
3566 case SI_BT:
1da177e4 3567 new_smi->handlers = &bt_smi_handlers;
b0defcdb
CM		 3568 break;
3569
3570 default:
1da177e4
LT		 3571 /* No support for anything else yet. */
3572 rv = -EIO;
3573 goto out_err;
3574 }
3575
3576 /* Allocate the state machine's data and initialize it. */
3577 new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL);
b0defcdb 3578 if (!new_smi->si_sm) {
279fbd0c
MS		 3579 printk(KERN_ERR PFX
3580 "Could not allocate state machine memory\n");
1da177e4
LT		 3581 rv = -ENOMEM;
3582 goto out_err;
3583 }
3584 new_smi->io_size = new_smi->handlers->init_data(new_smi->si_sm,
3585 &new_smi->io);
3586
3587 /* Now that we know the I/O size, we can set up the I/O. */
3588 rv = new_smi->io_setup(new_smi);
3589 if (rv) {
279fbd0c 3590 printk(KERN_ERR PFX "Could not set up I/O space\n");
1da177e4
LT		 3591 goto out_err;
3592 }
3593
1da177e4
LT		 3594 /* Do low-level detection first. */
3595 if (new_smi->handlers->detect(new_smi->si_sm)) {
b0defcdb 3596 if (new_smi->addr_source)
279fbd0c 3597 printk(KERN_INFO PFX "Interface detection failed\n");
1da177e4
LT		 3598 rv = -ENODEV;
3599 goto out_err;
3600 }
3601
c305e3d3
CM		 3602 /*
3603 * Attempt a get device id command. If it fails, we probably
3604 * don't have a BMC here.
3605 */
1da177e4 3606 rv = try_get_dev_id(new_smi);
b0defcdb
CM		 3607 if (rv) {
3608 if (new_smi->addr_source)
279fbd0c 3609 printk(KERN_INFO PFX "There appears to be no BMC"
b0defcdb 3610 " at this location\n");
1da177e4 3611 goto out_err;
b0defcdb 3612 }
1da177e4 3613
3ae0e0f9 3614 setup_oem_data_handler(new_smi);
ea94027b 3615 setup_xaction_handlers(new_smi);
d0882897 3616 check_for_broken_irqs(new_smi);
3ae0e0f9 3617
b874b985 3618 new_smi->waiting_msg = NULL;
1da177e4
LT		 3619 new_smi->curr_msg = NULL;
3620 atomic_set(&new_smi->req_events, 0);
7aefac26 3621 new_smi->run_to_completion = false;
64959e2d
CM		 3622 for (i = 0; i < SI_NUM_STATS; i++)
3623 atomic_set(&new_smi->stats[i], 0);
1da177e4 3624
7aefac26 3625 new_smi->interrupt_disabled = true;
89986496 3626 atomic_set(&new_smi->need_watch, 0);
b0defcdb
CM		 3627 new_smi->intf_num = smi_num;
3628 smi_num++;
1da177e4 3629
40112ae7
CM		 3630 rv = try_enable_event_buffer(new_smi);
3631 if (rv == 0)
7aefac26 3632 new_smi->has_event_buffer = true;
40112ae7 3633
c305e3d3
CM		 3634 /*
3635 * Start clearing the flags before we enable interrupts or the
3636 * timer to avoid racing with the timer.
3637 */
0cfec916 3638 start_clear_flags(new_smi, false);
d9b7e4f7
CM		 3639
3640 /*
3641 * IRQ is defined to be set when non-zero. req_events will
3642 * cause a global flags check that will enable interrupts.
3643 */
3644 if (new_smi->irq) {
3645 new_smi->interrupt_disabled = false;
3646 atomic_set(&new_smi->req_events, 1);
3647 }
1da177e4 3648
50c812b2 3649 if (!new_smi->dev) {
c305e3d3
CM		 3650 /*
3651 * If we don't already have a device from something
3652 * else (like PCI), then register a new one.
3653 */
50c812b2
CM		 3654 new_smi->pdev = platform_device_alloc("ipmi_si",
3655 new_smi->intf_num);
8b32b5d0 3656 if (!new_smi->pdev) {
279fbd0c
MS		 3657 printk(KERN_ERR PFX
3658 "Unable to allocate platform device\n");
453823ba 3659 goto out_err;
50c812b2
CM		 3660 }
3661 new_smi->dev = &new_smi->pdev->dev;
fe2d5ffc 3662 new_smi->dev->driver = &ipmi_driver.driver;
50c812b2 3663
b48f5457 3664 rv = platform_device_add(new_smi->pdev);
50c812b2 3665 if (rv) {
279fbd0c
MS		 3666 printk(KERN_ERR PFX
3667 "Unable to register system interface device:"
50c812b2
CM		 3668 " %d\n",
3669 rv);
453823ba 3670 goto out_err;
50c812b2 3671 }
7aefac26 3672 new_smi->dev_registered = true;
50c812b2
CM		 3673 }
3674
1da177e4
LT		 3675 rv = ipmi_register_smi(&handlers,
3676 new_smi,
50c812b2
CM		 3677 &new_smi->device_id,
3678 new_smi->dev,
453823ba 3679 new_smi->slave_addr);
1da177e4 3680 if (rv) {
279fbd0c
MS		 3681 dev_err(new_smi->dev, "Unable to register device: error %d\n",
3682 rv);
1da177e4
LT		 3683 goto out_err_stop_timer;
3684 }
3685
3686 rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
07412736 3687 &smi_type_proc_ops,
99b76233 3688 new_smi);
1da177e4 3689 if (rv) {
279fbd0c 3690 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
1da177e4
LT		 3691 goto out_err_stop_timer;
3692 }
3693
3694 rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
07412736 3695 &smi_si_stats_proc_ops,
99b76233 3696 new_smi);
1da177e4 3697 if (rv) {
279fbd0c 3698 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
1da177e4
LT		 3699 goto out_err_stop_timer;
3700 }
3701
b361e27b 3702 rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
07412736 3703 &smi_params_proc_ops,
99b76233 3704 new_smi);
b361e27b 3705 if (rv) {
279fbd0c 3706 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
b361e27b
CM		 3707 goto out_err_stop_timer;
3708 }
3709
279fbd0c
MS		 3710 dev_info(new_smi->dev, "IPMI %s interface initialized\n",
3711 si_to_str[new_smi->si_type]);
1da177e4
LT		 3712
3713 return 0;
3714
3715 out_err_stop_timer:
a9a2c44f 3716 wait_for_timer_and_thread(new_smi);
1da177e4
LT		 3717
3718 out_err:
7aefac26 3719 new_smi->interrupt_disabled = true;
2407d77a
MG		 3720
3721 if (new_smi->intf) {
b874b985 3722 ipmi_smi_t intf = new_smi->intf;
2407d77a 3723 new_smi->intf = NULL;
b874b985 3724 ipmi_unregister_smi(intf);
2407d77a 3725 }
1da177e4 3726
2407d77a 3727 if (new_smi->irq_cleanup) {
b0defcdb 3728 new_smi->irq_cleanup(new_smi);
2407d77a
MG		 3729 new_smi->irq_cleanup = NULL;
3730 }
1da177e4 3731
c305e3d3
CM		 3732 /*
3733 * Wait until we know that we are out of any interrupt
3734 * handlers might have been running before we freed the
3735 * interrupt.
3736 */
fbd568a3 3737 synchronize_sched();
1da177e4
LT		 3738
3739 if (new_smi->si_sm) {
3740 if (new_smi->handlers)
3741 new_smi->handlers->cleanup(new_smi->si_sm);
3742 kfree(new_smi->si_sm);
2407d77a 3743 new_smi->si_sm = NULL;
1da177e4 3744 }
2407d77a 3745 if (new_smi->addr_source_cleanup) {
b0defcdb 3746 new_smi->addr_source_cleanup(new_smi);
2407d77a
MG		 3747 new_smi->addr_source_cleanup = NULL;
3748 }
3749 if (new_smi->io_cleanup) {
7767e126 3750 new_smi->io_cleanup(new_smi);
2407d77a
MG		 3751 new_smi->io_cleanup = NULL;
3752 }
1da177e4 3753
2407d77a 3754 if (new_smi->dev_registered) {
50c812b2 3755 platform_device_unregister(new_smi->pdev);
7aefac26 3756 new_smi->dev_registered = false;
2407d77a 3757 }
b0defcdb 3758
1da177e4
LT		 3759 return rv;
3760}
3761
2223cbec 3762static int init_ipmi_si(void)
1da177e4 3763{
1da177e4
LT		 3764 int i;
3765 char *str;
50c812b2 3766 int rv;
2407d77a 3767 struct smi_info *e;
06ee4594 3768 enum ipmi_addr_src type = SI_INVALID;
1da177e4
LT		 3769
3770 if (initialized)
3771 return 0;
3772 initialized = 1;
3773
f2afae46
CM		 3774 if (si_tryplatform) {
3775 rv = platform_driver_register(&ipmi_driver);
3776 if (rv) {
3777 printk(KERN_ERR PFX "Unable to register "
3778 "driver: %d\n", rv);
3779 return rv;
3780 }
50c812b2
CM		 3781 }
3782
1da177e4
LT		 3783 /* Parse out the si_type string into its components. */
3784 str = si_type_str;
3785 if (*str != '\0') {
e8b33617 3786 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
1da177e4
LT		 3787 si_type[i] = str;
3788 str = strchr(str, ',');
3789 if (str) {
3790 *str = '\0';
3791 str++;
3792 } else {
3793 break;
3794 }
3795 }
3796 }
3797
1fdd75bd 3798 printk(KERN_INFO "IPMI System Interface driver.\n");
1da177e4 3799
d8cc5267 3800 /* If the user gave us a device, they presumably want us to use it */
a1e9c9dd 3801 if (!hardcode_find_bmc())
d8cc5267 3802 return 0;
d8cc5267 3803
b0defcdb 3804#ifdef CONFIG_PCI
f2afae46
CM		 3805 if (si_trypci) {
3806 rv = pci_register_driver(&ipmi_pci_driver);
3807 if (rv)
3808 printk(KERN_ERR PFX "Unable to register "
3809 "PCI driver: %d\n", rv);
3810 else
7aefac26 3811 pci_registered = true;
f2afae46 3812 }
b0defcdb
CM		 3813#endif
3814
754d4531 3815#ifdef CONFIG_DMI
d941aeae
CM		 3816 if (si_trydmi)
3817 dmi_find_bmc();
754d4531
MG		 3818#endif
3819
3820#ifdef CONFIG_ACPI
d941aeae
CM		 3821 if (si_tryacpi)
3822 spmi_find_bmc();
754d4531
MG		 3823#endif
3824
fdbeb7de
TB		 3825#ifdef CONFIG_PARISC
3826 register_parisc_driver(&ipmi_parisc_driver);
7aefac26 3827 parisc_registered = true;
fdbeb7de
TB		 3828 /* poking PC IO addresses will crash machine, don't do it */
3829 si_trydefaults = 0;
3830#endif
3831
06ee4594
MG		 3832 /* We prefer devices with interrupts, but in the case of a machine
3833 with multiple BMCs we assume that there will be several instances
3834 of a given type so if we succeed in registering a type then also
3835 try to register everything else of the same type */
d8cc5267 3836
2407d77a
MG		 3837 mutex_lock(&smi_infos_lock);
3838 list_for_each_entry(e, &smi_infos, link) {
06ee4594
MG		 3839 /* Try to register a device if it has an IRQ and we either
3840 haven't successfully registered a device yet or this
3841 device has the same type as one we successfully registered */
3842 if (e->irq && (!type || e->addr_source == type)) {
d8cc5267 3843 if (!try_smi_init(e)) {
06ee4594 3844 type = e->addr_source;
d8cc5267
MG		 3845 }
3846 }
3847 }
3848
06ee4594
MG		 3849 /* type will only have been set if we successfully registered an si */
3850 if (type) {
3851 mutex_unlock(&smi_infos_lock);
3852 return 0;
3853 }
3854
d8cc5267
MG		 3855 /* Fall back to the preferred device */
3856
3857 list_for_each_entry(e, &smi_infos, link) {
06ee4594 3858 if (!e->irq && (!type || e->addr_source == type)) {
d8cc5267 3859 if (!try_smi_init(e)) {
06ee4594 3860 type = e->addr_source;
d8cc5267
MG		 3861 }
3862 }
2407d77a
MG		 3863 }
3864 mutex_unlock(&smi_infos_lock);
3865
06ee4594
MG		 3866 if (type)
3867 return 0;
3868
b0defcdb 3869 if (si_trydefaults) {
d6dfd131 3870 mutex_lock(&smi_infos_lock);
b0defcdb
CM		 3871 if (list_empty(&smi_infos)) {
3872 /* No BMC was found, try defaults. */
d6dfd131 3873 mutex_unlock(&smi_infos_lock);
b0defcdb 3874 default_find_bmc();
2407d77a 3875 } else
d6dfd131 3876 mutex_unlock(&smi_infos_lock);
1da177e4
LT		 3877 }
3878
d6dfd131 3879 mutex_lock(&smi_infos_lock);
b361e27b 3880 if (unload_when_empty && list_empty(&smi_infos)) {
d6dfd131 3881 mutex_unlock(&smi_infos_lock);
d2478521 3882 cleanup_ipmi_si();
279fbd0c
MS		 3883 printk(KERN_WARNING PFX
3884 "Unable to find any System Interface(s)\n");
1da177e4 3885 return -ENODEV;
b0defcdb 3886 } else {
d6dfd131 3887 mutex_unlock(&smi_infos_lock);
b0defcdb 3888 return 0;
1da177e4 3889 }
1da177e4
LT		 3890}
3891module_init(init_ipmi_si);
3892
b361e27b 3893static void cleanup_one_si(struct smi_info *to_clean)
1da177e4 3894{
2407d77a 3895 int rv = 0;
1da177e4 3896
b0defcdb 3897 if (!to_clean)
1da177e4
LT		 3898 return;
3899
b874b985
CM		 3900 if (to_clean->intf) {
3901 ipmi_smi_t intf = to_clean->intf;
3902
3903 to_clean->intf = NULL;
3904 rv = ipmi_unregister_smi(intf);
3905 if (rv) {
3906 pr_err(PFX "Unable to unregister device: errno=%d\n",
3907 rv);
3908 }
3909 }
3910
567eded9
TI		 3911 if (to_clean->dev)
3912 dev_set_drvdata(to_clean->dev, NULL);
3913
b0defcdb
CM		 3914 list_del(&to_clean->link);
3915
c305e3d3 3916 /*
b874b985
CM		 3917 * Make sure that interrupts, the timer and the thread are
3918 * stopped and will not run again.
c305e3d3 3919 */
b874b985
CM		 3920 if (to_clean->irq_cleanup)
3921 to_clean->irq_cleanup(to_clean);
a9a2c44f 3922 wait_for_timer_and_thread(to_clean);
1da177e4 3923
c305e3d3
CM		 3924 /*
3925 * Timeouts are stopped, now make sure the interrupts are off
b874b985
CM		 3926 * in the BMC. Note that timers and CPU interrupts are off,
3927 * so no need for locks.
c305e3d3 3928 */
ee6cd5f8 3929 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
ee6cd5f8
CM		 3930 poll(to_clean);
3931 schedule_timeout_uninterruptible(1);
ee6cd5f8 3932 }
0cfec916 3933 disable_si_irq(to_clean, false);
e8b33617 3934 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
1da177e4 3935 poll(to_clean);
da4cd8df 3936 schedule_timeout_uninterruptible(1);
1da177e4
LT		 3937 }
3938
2407d77a
MG		 3939 if (to_clean->handlers)
3940 to_clean->handlers->cleanup(to_clean->si_sm);
1da177e4
LT		 3941
3942 kfree(to_clean->si_sm);
3943
b0defcdb
CM		 3944 if (to_clean->addr_source_cleanup)
3945 to_clean->addr_source_cleanup(to_clean);
7767e126
PG		 3946 if (to_clean->io_cleanup)
3947 to_clean->io_cleanup(to_clean);
50c812b2
CM		 3948
3949 if (to_clean->dev_registered)
3950 platform_device_unregister(to_clean->pdev);
3951
3952 kfree(to_clean);
1da177e4
LT		 3953}
3954
0dcf334c 3955static void cleanup_ipmi_si(void)
1da177e4 3956{
b0defcdb 3957 struct smi_info *e, *tmp_e;
1da177e4 3958
b0defcdb 3959 if (!initialized)
1da177e4
LT		 3960 return;
3961
b0defcdb 3962#ifdef CONFIG_PCI
56480287
MG		 3963 if (pci_registered)
3964 pci_unregister_driver(&ipmi_pci_driver);
b0defcdb 3965#endif
fdbeb7de
TB		 3966#ifdef CONFIG_PARISC
3967 if (parisc_registered)
3968 unregister_parisc_driver(&ipmi_parisc_driver);
3969#endif
b0defcdb 3970
a1e9c9dd 3971 platform_driver_unregister(&ipmi_driver);
dba9b4f6 3972
d6dfd131 3973 mutex_lock(&smi_infos_lock);
b0defcdb
CM		 3974 list_for_each_entry_safe(e, tmp_e, &smi_infos, link)
3975 cleanup_one_si(e);
d6dfd131 3976 mutex_unlock(&smi_infos_lock);
1da177e4
LT		 3977}
3978module_exit(cleanup_ipmi_si);
3979
3980MODULE_LICENSE("GPL");
1fdd75bd 3981MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
c305e3d3
CM		 3982MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT"
3983 " system interfaces.");
Linux 6.x block layer and io_uring tree(s)