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ipmi: Fix some minor coding style issues
[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>
58c9d61f 71#include <linux/acpi.h>
dba9b4f6 72
fdbeb7de
TB		 73#ifdef CONFIG_PARISC
74#include <asm/hardware.h> /* for register_parisc_driver() stuff */
75#include <asm/parisc-device.h>
76#endif
77
b361e27b 78#define PFX "ipmi_si: "
1da177e4
LT		 79
80/* Measure times between events in the driver. */
81#undef DEBUG_TIMING
82
83/* Call every 10 ms. */
84#define SI_TIMEOUT_TIME_USEC 10000
85#define SI_USEC_PER_JIFFY (1000000/HZ)
86#define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY)
87#define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a
c305e3d3 88 short timeout */
1da177e4
LT		 89
90enum si_intf_state {
91 SI_NORMAL,
92 SI_GETTING_FLAGS,
93 SI_GETTING_EVENTS,
94 SI_CLEARING_FLAGS,
1da177e4 95 SI_GETTING_MESSAGES,
d9b7e4f7
CM		 96 SI_CHECKING_ENABLES,
97 SI_SETTING_ENABLES
1da177e4
LT		 98 /* FIXME - add watchdog stuff. */
99};
100
9dbf68f9
CM		 101/* Some BT-specific defines we need here. */
102#define IPMI_BT_INTMASK_REG 2
103#define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2
104#define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1
105
1da177e4 106enum si_type {
76824852 107 SI_KCS, SI_SMIC, SI_BT
1da177e4 108};
99ee6735
LC		 109
110static const char * const si_to_str[] = { "kcs", "smic", "bt" };
1da177e4 111
50c812b2
CM		 112#define DEVICE_NAME "ipmi_si"
113
a1e9c9dd 114static struct platform_driver ipmi_driver;
64959e2d
CM		 115
116/*
117 * Indexes into stats[] in smi_info below.
118 */
ba8ff1c6
CM		 119enum si_stat_indexes {
120 /*
121 * Number of times the driver requested a timer while an operation
122 * was in progress.
123 */
124 SI_STAT_short_timeouts = 0,
125
126 /*
127 * Number of times the driver requested a timer while nothing was in
128 * progress.
129 */
130 SI_STAT_long_timeouts,
131
132 /* Number of times the interface was idle while being polled. */
133 SI_STAT_idles,
134
135 /* Number of interrupts the driver handled. */
136 SI_STAT_interrupts,
137
138 /* Number of time the driver got an ATTN from the hardware. */
139 SI_STAT_attentions,
64959e2d 140
ba8ff1c6
CM		 141 /* Number of times the driver requested flags from the hardware. */
142 SI_STAT_flag_fetches,
143
144 /* Number of times the hardware didn't follow the state machine. */
145 SI_STAT_hosed_count,
146
147 /* Number of completed messages. */
148 SI_STAT_complete_transactions,
149
150 /* Number of IPMI events received from the hardware. */
151 SI_STAT_events,
152
153 /* Number of watchdog pretimeouts. */
154 SI_STAT_watchdog_pretimeouts,
155
b3834be5 156 /* Number of asynchronous messages received. */
ba8ff1c6
CM		 157 SI_STAT_incoming_messages,
158
159
160 /* This *must* remain last, add new values above this. */
161 SI_NUM_STATS
162};
64959e2d 163
c305e3d3 164struct smi_info {
a9a2c44f 165 int intf_num;
1da177e4
LT		 166 ipmi_smi_t intf;
167 struct si_sm_data *si_sm;
81d02b7f 168 const struct si_sm_handlers *handlers;
1da177e4
LT		 169 enum si_type si_type;
170 spinlock_t si_lock;
b874b985 171 struct ipmi_smi_msg *waiting_msg;
1da177e4
LT		 172 struct ipmi_smi_msg *curr_msg;
173 enum si_intf_state si_state;
174
c305e3d3
CM		 175 /*
176 * Used to handle the various types of I/O that can occur with
177 * IPMI
178 */
1da177e4
LT		 179 struct si_sm_io io;
180 int (*io_setup)(struct smi_info *info);
181 void (*io_cleanup)(struct smi_info *info);
182 int (*irq_setup)(struct smi_info *info);
183 void (*irq_cleanup)(struct smi_info *info);
184 unsigned int io_size;
5fedc4a2 185 enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
b0defcdb
CM		 186 void (*addr_source_cleanup)(struct smi_info *info);
187 void *addr_source_data;
1da177e4 188
c305e3d3
CM		 189 /*
190 * Per-OEM handler, called from handle_flags(). Returns 1
191 * when handle_flags() needs to be re-run or 0 indicating it
192 * set si_state itself.
193 */
3ae0e0f9
CM		 194 int (*oem_data_avail_handler)(struct smi_info *smi_info);
195
c305e3d3
CM		 196 /*
197 * Flags from the last GET_MSG_FLAGS command, used when an ATTN
198 * is set to hold the flags until we are done handling everything
199 * from the flags.
200 */
1da177e4
LT		 201#define RECEIVE_MSG_AVAIL 0x01
202#define EVENT_MSG_BUFFER_FULL 0x02
203#define WDT_PRE_TIMEOUT_INT 0x08
3ae0e0f9
CM		 204#define OEM0_DATA_AVAIL 0x20
205#define OEM1_DATA_AVAIL 0x40
206#define OEM2_DATA_AVAIL 0x80
207#define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \
c305e3d3
CM		 208 OEM1_DATA_AVAIL | \
209 OEM2_DATA_AVAIL)
1da177e4
LT		 210 unsigned char msg_flags;
211
40112ae7 212 /* Does the BMC have an event buffer? */
7aefac26 213 bool has_event_buffer;
40112ae7 214
c305e3d3
CM		 215 /*
216 * If set to true, this will request events the next time the
217 * state machine is idle.
218 */
1da177e4
LT		 219 atomic_t req_events;
220
c305e3d3
CM		 221 /*
222 * If true, run the state machine to completion on every send
223 * call. Generally used after a panic to make sure stuff goes
224 * out.
225 */
7aefac26 226 bool run_to_completion;
1da177e4
LT		 227
228 /* The I/O port of an SI interface. */
229 int port;
230
c305e3d3
CM		 231 /*
232 * The space between start addresses of the two ports. For
233 * instance, if the first port is 0xca2 and the spacing is 4, then
234 * the second port is 0xca6.
235 */
1da177e4
LT		 236 unsigned int spacing;
237
238 /* zero if no irq; */
239 int irq;
240
241 /* The timer for this si. */
242 struct timer_list si_timer;
243
48e8ac29
BS		 244 /* This flag is set, if the timer is running (timer_pending() isn't enough) */
245 bool timer_running;
246
1da177e4
LT		 247 /* The time (in jiffies) the last timeout occurred at. */
248 unsigned long last_timeout_jiffies;
249
89986496
CM		 250 /* Are we waiting for the events, pretimeouts, received msgs? */
251 atomic_t need_watch;
252
c305e3d3
CM		 253 /*
254 * The driver will disable interrupts when it gets into a
255 * situation where it cannot handle messages due to lack of
256 * memory. Once that situation clears up, it will re-enable
257 * interrupts.
258 */
7aefac26 259 bool interrupt_disabled;
1da177e4 260
d9b7e4f7
CM		 261 /*
262 * Does the BMC support events?
263 */
264 bool supports_event_msg_buff;
265
1e7d6a45 266 /*
d0882897
CM		 267 * Can we disable interrupts the global enables receive irq
268 * bit? There are currently two forms of brokenness, some
269 * systems cannot disable the bit (which is technically within
270 * the spec but a bad idea) and some systems have the bit
271 * forced to zero even though interrupts work (which is
272 * clearly outside the spec). The next bool tells which form
273 * of brokenness is present.
1e7d6a45 274 */
d0882897
CM		 275 bool cannot_disable_irq;
276
277 /*
278 * Some systems are broken and cannot set the irq enable
279 * bit, even if they support interrupts.
280 */
281 bool irq_enable_broken;
1e7d6a45 282
a8df150c
CM		 283 /*
284 * Did we get an attention that we did not handle?
285 */
286 bool got_attn;
287
50c812b2 288 /* From the get device id response... */
3ae0e0f9 289 struct ipmi_device_id device_id;
1da177e4 290
50c812b2
CM		 291 /* Driver model stuff. */
292 struct device *dev;
293 struct platform_device *pdev;
294
c305e3d3
CM		 295 /*
296 * True if we allocated the device, false if it came from
297 * someplace else (like PCI).
298 */
7aefac26 299 bool dev_registered;
50c812b2 300
1da177e4
LT		 301 /* Slave address, could be reported from DMI. */
302 unsigned char slave_addr;
303
304 /* Counters and things for the proc filesystem. */
64959e2d 305 atomic_t stats[SI_NUM_STATS];
a9a2c44f 306
c305e3d3 307 struct task_struct *thread;
b0defcdb
CM		 308
309 struct list_head link;
16f4232c 310 union ipmi_smi_info_union addr_info;
1da177e4
LT		 311};
312
64959e2d
CM		 313#define smi_inc_stat(smi, stat) \
314 atomic_inc(&(smi)->stats[SI_STAT_ ## stat])
315#define smi_get_stat(smi, stat) \
316 ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat]))
317
a51f4a81
CM		 318#define SI_MAX_PARMS 4
319
320static int force_kipmid[SI_MAX_PARMS];
321static int num_force_kipmid;
56480287 322#ifdef CONFIG_PCI
7aefac26 323static bool pci_registered;
56480287 324#endif
fdbeb7de 325#ifdef CONFIG_PARISC
7aefac26 326static bool parisc_registered;
fdbeb7de 327#endif
a51f4a81 328
ae74e823
MW		 329static unsigned int kipmid_max_busy_us[SI_MAX_PARMS];
330static int num_max_busy_us;
331
7aefac26 332static bool unload_when_empty = true;
b361e27b 333
2407d77a 334static int add_smi(struct smi_info *smi);
b0defcdb 335static int try_smi_init(struct smi_info *smi);
b361e27b 336static void cleanup_one_si(struct smi_info *to_clean);
d2478521 337static void cleanup_ipmi_si(void);
b0defcdb 338
f93aae9f
JS		 339#ifdef DEBUG_TIMING
340void debug_timestamp(char *msg)
341{
48862ea2 342 struct timespec64 t;
f93aae9f 343
48862ea2
JS		 344 getnstimeofday64(&t);
345 pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) t.tv_sec, t.tv_nsec);
f93aae9f
JS		 346}
347#else
348#define debug_timestamp(x)
349#endif
350
e041c683 351static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list);
c305e3d3 352static int register_xaction_notifier(struct notifier_block *nb)
ea94027b 353{
e041c683 354 return atomic_notifier_chain_register(&xaction_notifier_list, nb);
ea94027b
CM		 355}
356
1da177e4
LT		 357static void deliver_recv_msg(struct smi_info *smi_info,
358 struct ipmi_smi_msg *msg)
359{
7adf579c 360 /* Deliver the message to the upper layer. */
968bf7cc
CM		 361 if (smi_info->intf)
362 ipmi_smi_msg_received(smi_info->intf, msg);
363 else
364 ipmi_free_smi_msg(msg);
1da177e4
LT		 365}
366
4d7cbac7 367static void return_hosed_msg(struct smi_info *smi_info, int cCode)
1da177e4
LT		 368{
369 struct ipmi_smi_msg *msg = smi_info->curr_msg;
370
4d7cbac7
CM		 371 if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED)
372 cCode = IPMI_ERR_UNSPECIFIED;
373 /* else use it as is */
374
25985edc 375 /* Make it a response */
1da177e4
LT		 376 msg->rsp[0] = msg->data[0] | 4;
377 msg->rsp[1] = msg->data[1];
4d7cbac7 378 msg->rsp[2] = cCode;
1da177e4
LT		 379 msg->rsp_size = 3;
380
381 smi_info->curr_msg = NULL;
382 deliver_recv_msg(smi_info, msg);
383}
384
385static enum si_sm_result start_next_msg(struct smi_info *smi_info)
386{
387 int rv;
1da177e4 388
b874b985 389 if (!smi_info->waiting_msg) {
1da177e4
LT		 390 smi_info->curr_msg = NULL;
391 rv = SI_SM_IDLE;
392 } else {
393 int err;
394
b874b985
CM		 395 smi_info->curr_msg = smi_info->waiting_msg;
396 smi_info->waiting_msg = NULL;
f93aae9f 397 debug_timestamp("Start2");
e041c683
AS		 398 err = atomic_notifier_call_chain(&xaction_notifier_list,
399 0, smi_info);
ea94027b
CM		 400 if (err & NOTIFY_STOP_MASK) {
401 rv = SI_SM_CALL_WITHOUT_DELAY;
402 goto out;
403 }
1da177e4
LT		 404 err = smi_info->handlers->start_transaction(
405 smi_info->si_sm,
406 smi_info->curr_msg->data,
407 smi_info->curr_msg->data_size);
c305e3d3 408 if (err)
4d7cbac7 409 return_hosed_msg(smi_info, err);
1da177e4
LT		 410
411 rv = SI_SM_CALL_WITHOUT_DELAY;
412 }
76824852 413out:
1da177e4
LT		 414 return rv;
415}
416
0cfec916
CM		 417static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val)
418{
419 smi_info->last_timeout_jiffies = jiffies;
420 mod_timer(&smi_info->si_timer, new_val);
421 smi_info->timer_running = true;
422}
423
424/*
425 * Start a new message and (re)start the timer and thread.
426 */
427static void start_new_msg(struct smi_info *smi_info, unsigned char *msg,
428 unsigned int size)
429{
430 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
431
432 if (smi_info->thread)
433 wake_up_process(smi_info->thread);
434
435 smi_info->handlers->start_transaction(smi_info->si_sm, msg, size);
436}
437
438static void start_check_enables(struct smi_info *smi_info, bool start_timer)
ee6cd5f8
CM		 439{
440 unsigned char msg[2];
441
442 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
443 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
444
0cfec916
CM		 445 if (start_timer)
446 start_new_msg(smi_info, msg, 2);
447 else
448 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
d9b7e4f7 449 smi_info->si_state = SI_CHECKING_ENABLES;
ee6cd5f8
CM		 450}
451
0cfec916 452static void start_clear_flags(struct smi_info *smi_info, bool start_timer)
1da177e4
LT		 453{
454 unsigned char msg[3];
455
456 /* Make sure the watchdog pre-timeout flag is not set at startup. */
457 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
458 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
459 msg[2] = WDT_PRE_TIMEOUT_INT;
460
0cfec916
CM		 461 if (start_timer)
462 start_new_msg(smi_info, msg, 3);
463 else
464 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
1da177e4
LT		 465 smi_info->si_state = SI_CLEARING_FLAGS;
466}
467
968bf7cc
CM		 468static void start_getting_msg_queue(struct smi_info *smi_info)
469{
470 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
471 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD;
472 smi_info->curr_msg->data_size = 2;
473
0cfec916
CM		 474 start_new_msg(smi_info, smi_info->curr_msg->data,
475 smi_info->curr_msg->data_size);
968bf7cc
CM		 476 smi_info->si_state = SI_GETTING_MESSAGES;
477}
478
479static void start_getting_events(struct smi_info *smi_info)
480{
481 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
482 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
483 smi_info->curr_msg->data_size = 2;
484
0cfec916
CM		 485 start_new_msg(smi_info, smi_info->curr_msg->data,
486 smi_info->curr_msg->data_size);
968bf7cc
CM		 487 smi_info->si_state = SI_GETTING_EVENTS;
488}
489
c305e3d3
CM		 490/*
491 * When we have a situtaion where we run out of memory and cannot
492 * allocate messages, we just leave them in the BMC and run the system
493 * polled until we can allocate some memory. Once we have some
494 * memory, we will re-enable the interrupt.
1e7d6a45
CM		 495 *
496 * Note that we cannot just use disable_irq(), since the interrupt may
497 * be shared.
c305e3d3 498 */
0cfec916 499static inline bool disable_si_irq(struct smi_info *smi_info, bool start_timer)
1da177e4 500{
b0defcdb 501 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
7aefac26 502 smi_info->interrupt_disabled = true;
0cfec916 503 start_check_enables(smi_info, start_timer);
968bf7cc 504 return true;
1da177e4 505 }
968bf7cc 506 return false;
1da177e4
LT		 507}
508
968bf7cc 509static inline bool enable_si_irq(struct smi_info *smi_info)
1da177e4
LT		 510{
511 if ((smi_info->irq) && (smi_info->interrupt_disabled)) {
7aefac26 512 smi_info->interrupt_disabled = false;
0cfec916 513 start_check_enables(smi_info, true);
968bf7cc
CM		 514 return true;
515 }
516 return false;
517}
518
519/*
520 * Allocate a message. If unable to allocate, start the interrupt
521 * disable process and return NULL. If able to allocate but
522 * interrupts are disabled, free the message and return NULL after
523 * starting the interrupt enable process.
524 */
525static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info)
526{
527 struct ipmi_smi_msg *msg;
528
529 msg = ipmi_alloc_smi_msg();
530 if (!msg) {
0cfec916 531 if (!disable_si_irq(smi_info, true))
968bf7cc
CM		 532 smi_info->si_state = SI_NORMAL;
533 } else if (enable_si_irq(smi_info)) {
534 ipmi_free_smi_msg(msg);
535 msg = NULL;
1da177e4 536 }
968bf7cc 537 return msg;
1da177e4
LT		 538}
539
540static void handle_flags(struct smi_info *smi_info)
541{
76824852 542retry:
1da177e4
LT		 543 if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
544 /* Watchdog pre-timeout */
64959e2d 545 smi_inc_stat(smi_info, watchdog_pretimeouts);
1da177e4 546
0cfec916 547 start_clear_flags(smi_info, true);
1da177e4 548 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
968bf7cc
CM		 549 if (smi_info->intf)
550 ipmi_smi_watchdog_pretimeout(smi_info->intf);
1da177e4
LT		 551 } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) {
552 /* Messages available. */
968bf7cc
CM		 553 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
554 if (!smi_info->curr_msg)
1da177e4 555 return;
1da177e4 556
968bf7cc 557 start_getting_msg_queue(smi_info);
1da177e4
LT		 558 } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) {
559 /* Events available. */
968bf7cc
CM		 560 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
561 if (!smi_info->curr_msg)
1da177e4 562 return;
1da177e4 563
968bf7cc 564 start_getting_events(smi_info);
4064d5ef 565 } else if (smi_info->msg_flags & OEM_DATA_AVAIL &&
c305e3d3 566 smi_info->oem_data_avail_handler) {
4064d5ef
CM		 567 if (smi_info->oem_data_avail_handler(smi_info))
568 goto retry;
c305e3d3 569 } else
1da177e4 570 smi_info->si_state = SI_NORMAL;
1da177e4
LT		 571}
572
d9b7e4f7
CM		 573/*
574 * Global enables we care about.
575 */
576#define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
577 IPMI_BMC_EVT_MSG_INTR)
578
95c97b59
CM		 579static u8 current_global_enables(struct smi_info *smi_info, u8 base,
580 bool *irq_on)
d9b7e4f7
CM		 581{
582 u8 enables = 0;
583
584 if (smi_info->supports_event_msg_buff)
585 enables |= IPMI_BMC_EVT_MSG_BUFF;
d9b7e4f7 586
d0882897
CM		 587 if (((smi_info->irq && !smi_info->interrupt_disabled) ||
588 smi_info->cannot_disable_irq) &&
589 !smi_info->irq_enable_broken)
d9b7e4f7 590 enables |= IPMI_BMC_RCV_MSG_INTR;
d9b7e4f7
CM		 591
592 if (smi_info->supports_event_msg_buff &&
d0882897
CM		 593 smi_info->irq && !smi_info->interrupt_disabled &&
594 !smi_info->irq_enable_broken)
d9b7e4f7 595 enables |= IPMI_BMC_EVT_MSG_INTR;
d9b7e4f7 596
95c97b59
CM		 597 *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR);
598
d9b7e4f7
CM		 599 return enables;
600}
601
95c97b59
CM		 602static void check_bt_irq(struct smi_info *smi_info, bool irq_on)
603{
604 u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG);
605
606 irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT;
607
608 if ((bool)irqstate == irq_on)
609 return;
610
611 if (irq_on)
612 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
613 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
614 else
615 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0);
616}
617
1da177e4
LT		 618static void handle_transaction_done(struct smi_info *smi_info)
619{
620 struct ipmi_smi_msg *msg;
1da177e4 621
f93aae9f 622 debug_timestamp("Done");
1da177e4
LT		 623 switch (smi_info->si_state) {
624 case SI_NORMAL:
b0defcdb 625 if (!smi_info->curr_msg)
1da177e4
LT		 626 break;
627
628 smi_info->curr_msg->rsp_size
629 = smi_info->handlers->get_result(
630 smi_info->si_sm,
631 smi_info->curr_msg->rsp,
632 IPMI_MAX_MSG_LENGTH);
633
c305e3d3
CM		 634 /*
635 * Do this here becase deliver_recv_msg() releases the
636 * lock, and a new message can be put in during the
637 * time the lock is released.
638 */
1da177e4
LT		 639 msg = smi_info->curr_msg;
640 smi_info->curr_msg = NULL;
641 deliver_recv_msg(smi_info, msg);
642 break;
643
644 case SI_GETTING_FLAGS:
645 {
646 unsigned char msg[4];
647 unsigned int len;
648
649 /* We got the flags from the SMI, now handle them. */
650 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
651 if (msg[2] != 0) {
c305e3d3 652 /* Error fetching flags, just give up for now. */
1da177e4
LT		 653 smi_info->si_state = SI_NORMAL;
654 } else if (len < 4) {
c305e3d3
CM		 655 /*
656 * Hmm, no flags. That's technically illegal, but
657 * don't use uninitialized data.
658 */
1da177e4
LT		 659 smi_info->si_state = SI_NORMAL;
660 } else {
661 smi_info->msg_flags = msg[3];
662 handle_flags(smi_info);
663 }
664 break;
665 }
666
667 case SI_CLEARING_FLAGS:
1da177e4
LT		 668 {
669 unsigned char msg[3];
670
671 /* We cleared the flags. */
672 smi_info->handlers->get_result(smi_info->si_sm, msg, 3);
673 if (msg[2] != 0) {
674 /* Error clearing flags */
279fbd0c
MS		 675 dev_warn(smi_info->dev,
676 "Error clearing flags: %2.2x\n", msg[2]);
1da177e4 677 }
d9b7e4f7 678 smi_info->si_state = SI_NORMAL;
1da177e4
LT		 679 break;
680 }
681
682 case SI_GETTING_EVENTS:
683 {
684 smi_info->curr_msg->rsp_size
685 = smi_info->handlers->get_result(
686 smi_info->si_sm,
687 smi_info->curr_msg->rsp,
688 IPMI_MAX_MSG_LENGTH);
689
c305e3d3
CM		 690 /*
691 * Do this here becase deliver_recv_msg() releases the
692 * lock, and a new message can be put in during the
693 * time the lock is released.
694 */
1da177e4
LT		 695 msg = smi_info->curr_msg;
696 smi_info->curr_msg = NULL;
697 if (msg->rsp[2] != 0) {
698 /* Error getting event, probably done. */
699 msg->done(msg);
700
701 /* Take off the event flag. */
702 smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
703 handle_flags(smi_info);
704 } else {
64959e2d 705 smi_inc_stat(smi_info, events);
1da177e4 706
c305e3d3
CM		 707 /*
708 * Do this before we deliver the message
709 * because delivering the message releases the
710 * lock and something else can mess with the
711 * state.
712 */
1da177e4
LT		 713 handle_flags(smi_info);
714
715 deliver_recv_msg(smi_info, msg);
716 }
717 break;
718 }
719
720 case SI_GETTING_MESSAGES:
721 {
722 smi_info->curr_msg->rsp_size
723 = smi_info->handlers->get_result(
724 smi_info->si_sm,
725 smi_info->curr_msg->rsp,
726 IPMI_MAX_MSG_LENGTH);
727
c305e3d3
CM		 728 /*
729 * Do this here becase deliver_recv_msg() releases the
730 * lock, and a new message can be put in during the
731 * time the lock is released.
732 */
1da177e4
LT		 733 msg = smi_info->curr_msg;
734 smi_info->curr_msg = NULL;
735 if (msg->rsp[2] != 0) {
736 /* Error getting event, probably done. */
737 msg->done(msg);
738
739 /* Take off the msg flag. */
740 smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
741 handle_flags(smi_info);
742 } else {
64959e2d 743 smi_inc_stat(smi_info, incoming_messages);
1da177e4 744
c305e3d3
CM		 745 /*
746 * Do this before we deliver the message
747 * because delivering the message releases the
748 * lock and something else can mess with the
749 * state.
750 */
1da177e4
LT		 751 handle_flags(smi_info);
752
753 deliver_recv_msg(smi_info, msg);
754 }
755 break;
756 }
757
d9b7e4f7 758 case SI_CHECKING_ENABLES:
1da177e4
LT		 759 {
760 unsigned char msg[4];
d9b7e4f7 761 u8 enables;
95c97b59 762 bool irq_on;
1da177e4
LT		 763
764 /* We got the flags from the SMI, now handle them. */
765 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
766 if (msg[2] != 0) {
0849bfec
CM		 767 dev_warn(smi_info->dev,
768 "Couldn't get irq info: %x.\n", msg[2]);
769 dev_warn(smi_info->dev,
770 "Maybe ok, but ipmi might run very slowly.\n");
1da177e4 771 smi_info->si_state = SI_NORMAL;
d9b7e4f7
CM		 772 break;
773 }
95c97b59
CM		 774 enables = current_global_enables(smi_info, 0, &irq_on);
775 if (smi_info->si_type == SI_BT)
776 /* BT has its own interrupt enable bit. */
777 check_bt_irq(smi_info, irq_on);
d9b7e4f7
CM		 778 if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) {
779 /* Enables are not correct, fix them. */
1da177e4
LT		 780 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
781 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
d9b7e4f7 782 msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK);
1da177e4
LT		 783 smi_info->handlers->start_transaction(
784 smi_info->si_sm, msg, 3);
d9b7e4f7
CM		 785 smi_info->si_state = SI_SETTING_ENABLES;
786 } else if (smi_info->supports_event_msg_buff) {
787 smi_info->curr_msg = ipmi_alloc_smi_msg();
788 if (!smi_info->curr_msg) {
789 smi_info->si_state = SI_NORMAL;
790 break;
791 }
792 start_getting_msg_queue(smi_info);
793 } else {
794 smi_info->si_state = SI_NORMAL;
1da177e4
LT		 795 }
796 break;
797 }
798
d9b7e4f7 799 case SI_SETTING_ENABLES:
1da177e4
LT		 800 {
801 unsigned char msg[4];
802
1da177e4 803 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
d9b7e4f7 804 if (msg[2] != 0)
0849bfec 805 dev_warn(smi_info->dev,
d9b7e4f7
CM		 806 "Could not set the global enables: 0x%x.\n",
807 msg[2]);
808
809 if (smi_info->supports_event_msg_buff) {
810 smi_info->curr_msg = ipmi_alloc_smi_msg();
811 if (!smi_info->curr_msg) {
812 smi_info->si_state = SI_NORMAL;
813 break;
814 }
815 start_getting_msg_queue(smi_info);
ee6cd5f8 816 } else {
d9b7e4f7 817 smi_info->si_state = SI_NORMAL;
ee6cd5f8 818 }
ee6cd5f8
CM		 819 break;
820 }
1da177e4
LT		 821 }
822}
823
c305e3d3
CM		 824/*
825 * Called on timeouts and events. Timeouts should pass the elapsed
826 * time, interrupts should pass in zero. Must be called with
827 * si_lock held and interrupts disabled.
828 */
1da177e4
LT		 829static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
830 int time)
831{
832 enum si_sm_result si_sm_result;
833
76824852 834restart:
c305e3d3
CM		 835 /*
836 * There used to be a loop here that waited a little while
837 * (around 25us) before giving up. That turned out to be
838 * pointless, the minimum delays I was seeing were in the 300us
839 * range, which is far too long to wait in an interrupt. So
840 * we just run until the state machine tells us something
841 * happened or it needs a delay.
842 */
1da177e4
LT		 843 si_sm_result = smi_info->handlers->event(smi_info->si_sm, time);
844 time = 0;
845 while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY)
1da177e4 846 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
1da177e4 847
c305e3d3 848 if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) {
64959e2d 849 smi_inc_stat(smi_info, complete_transactions);
1da177e4
LT		 850
851 handle_transaction_done(smi_info);
d9dffd2a 852 goto restart;
c305e3d3 853 } else if (si_sm_result == SI_SM_HOSED) {
64959e2d 854 smi_inc_stat(smi_info, hosed_count);
1da177e4 855
c305e3d3
CM		 856 /*
857 * Do the before return_hosed_msg, because that
858 * releases the lock.
859 */
1da177e4
LT		 860 smi_info->si_state = SI_NORMAL;
861 if (smi_info->curr_msg != NULL) {
c305e3d3
CM		 862 /*
863 * If we were handling a user message, format
864 * a response to send to the upper layer to
865 * tell it about the error.
866 */
4d7cbac7 867 return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED);
1da177e4 868 }
d9dffd2a 869 goto restart;
1da177e4
LT		 870 }
871
4ea18425
CM		 872 /*
873 * We prefer handling attn over new messages. But don't do
874 * this if there is not yet an upper layer to handle anything.
875 */
a8df150c
CM		 876 if (likely(smi_info->intf) &&
877 (si_sm_result == SI_SM_ATTN || smi_info->got_attn)) {
1da177e4
LT		 878 unsigned char msg[2];
879
a8df150c
CM		 880 if (smi_info->si_state != SI_NORMAL) {
881 /*
882 * We got an ATTN, but we are doing something else.
883 * Handle the ATTN later.
884 */
885 smi_info->got_attn = true;
886 } else {
887 smi_info->got_attn = false;
888 smi_inc_stat(smi_info, attentions);
1da177e4 889
a8df150c
CM		 890 /*
891 * Got a attn, send down a get message flags to see
892 * what's causing it. It would be better to handle
893 * this in the upper layer, but due to the way
894 * interrupts work with the SMI, that's not really
895 * possible.
896 */
897 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
898 msg[1] = IPMI_GET_MSG_FLAGS_CMD;
1da177e4 899
0cfec916 900 start_new_msg(smi_info, msg, 2);
a8df150c
CM		 901 smi_info->si_state = SI_GETTING_FLAGS;
902 goto restart;
903 }
1da177e4
LT		 904 }
905
906 /* If we are currently idle, try to start the next message. */
907 if (si_sm_result == SI_SM_IDLE) {
64959e2d 908 smi_inc_stat(smi_info, idles);
1da177e4
LT		 909
910 si_sm_result = start_next_msg(smi_info);
911 if (si_sm_result != SI_SM_IDLE)
912 goto restart;
c305e3d3 913 }
1da177e4
LT		 914
915 if ((si_sm_result == SI_SM_IDLE)
c305e3d3
CM		 916 && (atomic_read(&smi_info->req_events))) {
917 /*
918 * We are idle and the upper layer requested that I fetch
919 * events, so do so.
920 */
55162fb1 921 atomic_set(&smi_info->req_events, 0);
1da177e4 922
d9b7e4f7
CM		 923 /*
924 * Take this opportunity to check the interrupt and
925 * message enable state for the BMC. The BMC can be
926 * asynchronously reset, and may thus get interrupts
927 * disable and messages disabled.
928 */
929 if (smi_info->supports_event_msg_buff || smi_info->irq) {
0cfec916 930 start_check_enables(smi_info, true);
d9b7e4f7
CM		 931 } else {
932 smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
933 if (!smi_info->curr_msg)
934 goto out;
1da177e4 935
d9b7e4f7
CM		 936 start_getting_events(smi_info);
937 }
1da177e4
LT		 938 goto restart;
939 }
314ef52f
CM		 940
941 if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) {
942 /* Ok it if fails, the timer will just go off. */
943 if (del_timer(&smi_info->si_timer))
944 smi_info->timer_running = false;
945 }
946
76824852 947out:
1da177e4
LT		 948 return si_sm_result;
949}
950
89986496
CM		 951static void check_start_timer_thread(struct smi_info *smi_info)
952{
953 if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
954 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
955
956 if (smi_info->thread)
957 wake_up_process(smi_info->thread);
958
959 start_next_msg(smi_info);
960 smi_event_handler(smi_info, 0);
961 }
962}
963
82802f96 964static void flush_messages(void *send_info)
e45361d7 965{
82802f96 966 struct smi_info *smi_info = send_info;
e45361d7
HK		 967 enum si_sm_result result;
968
969 /*
970 * Currently, this function is called only in run-to-completion
971 * mode. This means we are single-threaded, no need for locks.
972 */
973 result = smi_event_handler(smi_info, 0);
974 while (result != SI_SM_IDLE) {
975 udelay(SI_SHORT_TIMEOUT_USEC);
976 result = smi_event_handler(smi_info, SI_SHORT_TIMEOUT_USEC);
977 }
978}
979
1da177e4 980static void sender(void *send_info,
99ab32f3 981 struct ipmi_smi_msg *msg)
1da177e4
LT		 982{
983 struct smi_info *smi_info = send_info;
1da177e4 984 unsigned long flags;
1da177e4 985
f93aae9f 986 debug_timestamp("Enqueue");
1da177e4
LT		 987
988 if (smi_info->run_to_completion) {
bda4c30a 989 /*
82802f96
HK		 990 * If we are running to completion, start it. Upper
991 * layer will call flush_messages to clear it out.
bda4c30a 992 */
9f812704 993 smi_info->waiting_msg = msg;
1da177e4 994 return;
1da177e4 995 }
1da177e4 996
f60adf42 997 spin_lock_irqsave(&smi_info->si_lock, flags);
1d86e29b
CM		 998 /*
999 * The following two lines don't need to be under the lock for
1000 * the lock's sake, but they do need SMP memory barriers to
1001 * avoid getting things out of order. We are already claiming
1002 * the lock, anyway, so just do it under the lock to avoid the
1003 * ordering problem.
1004 */
1005 BUG_ON(smi_info->waiting_msg);
1006 smi_info->waiting_msg = msg;
89986496 1007 check_start_timer_thread(smi_info);
bda4c30a 1008 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1da177e4
LT		 1009}
1010
7aefac26 1011static void set_run_to_completion(void *send_info, bool i_run_to_completion)
1da177e4
LT		 1012{
1013 struct smi_info *smi_info = send_info;
1da177e4
LT		 1014
1015 smi_info->run_to_completion = i_run_to_completion;
e45361d7
HK		 1016 if (i_run_to_completion)
1017 flush_messages(smi_info);
1da177e4
LT		 1018}
1019
ae74e823
MW		 1020/*
1021 * Use -1 in the nsec value of the busy waiting timespec to tell that
1022 * we are spinning in kipmid looking for something and not delaying
1023 * between checks
1024 */
48862ea2 1025static inline void ipmi_si_set_not_busy(struct timespec64 *ts)
ae74e823
MW		 1026{
1027 ts->tv_nsec = -1;
1028}
48862ea2 1029static inline int ipmi_si_is_busy(struct timespec64 *ts)
ae74e823
MW		 1030{
1031 return ts->tv_nsec != -1;
1032}
1033
cc4cbe90
AB		 1034static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result,
1035 const struct smi_info *smi_info,
48862ea2 1036 struct timespec64 *busy_until)
ae74e823
MW		 1037{
1038 unsigned int max_busy_us = 0;
1039
1040 if (smi_info->intf_num < num_max_busy_us)
1041 max_busy_us = kipmid_max_busy_us[smi_info->intf_num];
1042 if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY)
1043 ipmi_si_set_not_busy(busy_until);
1044 else if (!ipmi_si_is_busy(busy_until)) {
48862ea2
JS		 1045 getnstimeofday64(busy_until);
1046 timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC);
ae74e823 1047 } else {
48862ea2
JS		 1048 struct timespec64 now;
1049
1050 getnstimeofday64(&now);
1051 if (unlikely(timespec64_compare(&now, busy_until) > 0)) {
ae74e823
MW		 1052 ipmi_si_set_not_busy(busy_until);
1053 return 0;
1054 }
1055 }
1056 return 1;
1057}
1058
1059
1060/*
1061 * A busy-waiting loop for speeding up IPMI operation.
1062 *
1063 * Lousy hardware makes this hard. This is only enabled for systems
1064 * that are not BT and do not have interrupts. It starts spinning
1065 * when an operation is complete or until max_busy tells it to stop
1066 * (if that is enabled). See the paragraph on kimid_max_busy_us in
1067 * Documentation/IPMI.txt for details.
1068 */
a9a2c44f
CM		 1069static int ipmi_thread(void *data)
1070{
1071 struct smi_info *smi_info = data;
e9a705a0 1072 unsigned long flags;
a9a2c44f 1073 enum si_sm_result smi_result;
48862ea2 1074 struct timespec64 busy_until;
a9a2c44f 1075
ae74e823 1076 ipmi_si_set_not_busy(&busy_until);
8698a745 1077 set_user_nice(current, MAX_NICE);
e9a705a0 1078 while (!kthread_should_stop()) {
ae74e823
MW		 1079 int busy_wait;
1080
a9a2c44f 1081 spin_lock_irqsave(&(smi_info->si_lock), flags);
8a3628d5 1082 smi_result = smi_event_handler(smi_info, 0);
48e8ac29
BS		 1083
1084 /*
1085 * If the driver is doing something, there is a possible
1086 * race with the timer. If the timer handler see idle,
1087 * and the thread here sees something else, the timer
1088 * handler won't restart the timer even though it is
1089 * required. So start it here if necessary.
1090 */
1091 if (smi_result != SI_SM_IDLE && !smi_info->timer_running)
1092 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES);
1093
a9a2c44f 1094 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
ae74e823
MW		 1095 busy_wait = ipmi_thread_busy_wait(smi_result, smi_info,
1096 &busy_until);
c305e3d3
CM		 1097 if (smi_result == SI_SM_CALL_WITHOUT_DELAY)
1098 ; /* do nothing */
ae74e823 1099 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
33979734 1100 schedule();
89986496
CM		 1101 else if (smi_result == SI_SM_IDLE) {
1102 if (atomic_read(&smi_info->need_watch)) {
1103 schedule_timeout_interruptible(100);
1104 } else {
1105 /* Wait to be woken up when we are needed. */
1106 __set_current_state(TASK_INTERRUPTIBLE);
1107 schedule();
1108 }
1109 } else
8d1f66dc 1110 schedule_timeout_interruptible(1);
a9a2c44f 1111 }
a9a2c44f
CM		 1112 return 0;
1113}
1114
1115
1da177e4
LT		 1116static void poll(void *send_info)
1117{
1118 struct smi_info *smi_info = send_info;
f60adf42 1119 unsigned long flags = 0;
7aefac26 1120 bool run_to_completion = smi_info->run_to_completion;
1da177e4 1121
15c62e10
CM		 1122 /*
1123 * Make sure there is some delay in the poll loop so we can
1124 * drive time forward and timeout things.
1125 */
1126 udelay(10);
f60adf42
CM		 1127 if (!run_to_completion)
1128 spin_lock_irqsave(&smi_info->si_lock, flags);
15c62e10 1129 smi_event_handler(smi_info, 10);
f60adf42
CM		 1130 if (!run_to_completion)
1131 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1da177e4
LT		 1132}
1133
1134static void request_events(void *send_info)
1135{
1136 struct smi_info *smi_info = send_info;
1137
b874b985 1138 if (!smi_info->has_event_buffer)
b361e27b
CM		 1139 return;
1140
1da177e4
LT		 1141 atomic_set(&smi_info->req_events, 1);
1142}
1143
7aefac26 1144static void set_need_watch(void *send_info, bool enable)
89986496
CM		 1145{
1146 struct smi_info *smi_info = send_info;
1147 unsigned long flags;
1148
1149 atomic_set(&smi_info->need_watch, enable);
1150 spin_lock_irqsave(&smi_info->si_lock, flags);
1151 check_start_timer_thread(smi_info);
1152 spin_unlock_irqrestore(&smi_info->si_lock, flags);
1153}
1154
0c8204b3 1155static int initialized;
1da177e4 1156
1da177e4
LT		 1157static void smi_timeout(unsigned long data)
1158{
1159 struct smi_info *smi_info = (struct smi_info *) data;
1160 enum si_sm_result smi_result;
1161 unsigned long flags;
1162 unsigned long jiffies_now;
c4edff1c 1163 long time_diff;
3326f4f2 1164 long timeout;
1da177e4 1165
1da177e4 1166 spin_lock_irqsave(&(smi_info->si_lock), flags);
f93aae9f
JS		 1167 debug_timestamp("Timer");
1168
1da177e4 1169 jiffies_now = jiffies;
c4edff1c 1170 time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies)
1da177e4
LT		 1171 * SI_USEC_PER_JIFFY);
1172 smi_result = smi_event_handler(smi_info, time_diff);
1173
b0defcdb 1174 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
1da177e4 1175 /* Running with interrupts, only do long timeouts. */
3326f4f2 1176 timeout = jiffies + SI_TIMEOUT_JIFFIES;
64959e2d 1177 smi_inc_stat(smi_info, long_timeouts);
3326f4f2 1178 goto do_mod_timer;
1da177e4
LT		 1179 }
1180
c305e3d3
CM		 1181 /*
1182 * If the state machine asks for a short delay, then shorten
1183 * the timer timeout.
1184 */
1da177e4 1185 if (smi_result == SI_SM_CALL_WITH_DELAY) {
64959e2d 1186 smi_inc_stat(smi_info, short_timeouts);
3326f4f2 1187 timeout = jiffies + 1;
1da177e4 1188 } else {
64959e2d 1189 smi_inc_stat(smi_info, long_timeouts);
3326f4f2 1190 timeout = jiffies + SI_TIMEOUT_JIFFIES;
1da177e4
LT		 1191 }
1192
76824852 1193do_mod_timer:
3326f4f2 1194 if (smi_result != SI_SM_IDLE)
48e8ac29
BS		 1195 smi_mod_timer(smi_info, timeout);
1196 else
1197 smi_info->timer_running = false;
1198 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1da177e4
LT		 1199}
1200
7d12e780 1201static irqreturn_t si_irq_handler(int irq, void *data)
1da177e4
LT		 1202{
1203 struct smi_info *smi_info = data;
1204 unsigned long flags;
1da177e4
LT		 1205
1206 spin_lock_irqsave(&(smi_info->si_lock), flags);
1207
64959e2d 1208 smi_inc_stat(smi_info, interrupts);
1da177e4 1209
f93aae9f
JS		 1210 debug_timestamp("Interrupt");
1211
1da177e4 1212 smi_event_handler(smi_info, 0);
1da177e4
LT		 1213 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1214 return IRQ_HANDLED;
1215}
1216
7d12e780 1217static irqreturn_t si_bt_irq_handler(int irq, void *data)
9dbf68f9
CM		 1218{
1219 struct smi_info *smi_info = data;
1220 /* We need to clear the IRQ flag for the BT interface. */
1221 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
1222 IPMI_BT_INTMASK_CLEAR_IRQ_BIT
1223 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
7d12e780 1224 return si_irq_handler(irq, data);
9dbf68f9
CM		 1225}
1226
453823ba
CM		 1227static int smi_start_processing(void *send_info,
1228 ipmi_smi_t intf)
1229{
1230 struct smi_info *new_smi = send_info;
a51f4a81 1231 int enable = 0;
453823ba
CM		 1232
1233 new_smi->intf = intf;
1234
1235 /* Set up the timer that drives the interface. */
1236 setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi);
48e8ac29 1237 smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES);
453823ba 1238
27f972d3
JS		 1239 /* Try to claim any interrupts. */
1240 if (new_smi->irq_setup)
1241 new_smi->irq_setup(new_smi);
1242
a51f4a81
CM		 1243 /*
1244 * Check if the user forcefully enabled the daemon.
1245 */
1246 if (new_smi->intf_num < num_force_kipmid)
1247 enable = force_kipmid[new_smi->intf_num];
df3fe8de
CM		 1248 /*
1249 * The BT interface is efficient enough to not need a thread,
1250 * and there is no need for a thread if we have interrupts.
1251 */
c305e3d3 1252 else if ((new_smi->si_type != SI_BT) && (!new_smi->irq))
a51f4a81
CM		 1253 enable = 1;
1254
1255 if (enable) {
453823ba
CM		 1256 new_smi->thread = kthread_run(ipmi_thread, new_smi,
1257 "kipmi%d", new_smi->intf_num);
1258 if (IS_ERR(new_smi->thread)) {
279fbd0c
MS		 1259 dev_notice(new_smi->dev, "Could not start"
1260 " kernel thread due to error %ld, only using"
1261 " timers to drive the interface\n",
1262 PTR_ERR(new_smi->thread));
453823ba
CM		 1263 new_smi->thread = NULL;
1264 }
1265 }
1266
1267 return 0;
1268}
9dbf68f9 1269
16f4232c
ZY		 1270static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1271{
1272 struct smi_info *smi = send_info;
1273
1274 data->addr_src = smi->addr_source;
1275 data->dev = smi->dev;
1276 data->addr_info = smi->addr_info;
1277 get_device(smi->dev);
1278
1279 return 0;
1280}
1281
7aefac26 1282static void set_maintenance_mode(void *send_info, bool enable)
b9675136
CM		 1283{
1284 struct smi_info *smi_info = send_info;
1285
1286 if (!enable)
1287 atomic_set(&smi_info->req_events, 0);
1288}
1289
81d02b7f 1290static const struct ipmi_smi_handlers handlers = {
1da177e4 1291 .owner = THIS_MODULE,
453823ba 1292 .start_processing = smi_start_processing,
16f4232c 1293 .get_smi_info = get_smi_info,
1da177e4
LT		 1294 .sender = sender,
1295 .request_events = request_events,
89986496 1296 .set_need_watch = set_need_watch,
b9675136 1297 .set_maintenance_mode = set_maintenance_mode,
1da177e4 1298 .set_run_to_completion = set_run_to_completion,
82802f96 1299 .flush_messages = flush_messages,
1da177e4
LT		 1300 .poll = poll,
1301};
1302
c305e3d3
CM		 1303/*
1304 * There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
1305 * a default IO port, and 1 ACPI/SPMI address. That sets SI_MAX_DRIVERS.
1306 */
1da177e4 1307
b0defcdb 1308static LIST_HEAD(smi_infos);
d6dfd131 1309static DEFINE_MUTEX(smi_infos_lock);
b0defcdb 1310static int smi_num; /* Used to sequence the SMIs */
1da177e4 1311
1da177e4 1312#define DEFAULT_REGSPACING 1
dba9b4f6 1313#define DEFAULT_REGSIZE 1
1da177e4 1314
d941aeae 1315#ifdef CONFIG_ACPI
fedb25ea 1316static bool si_tryacpi = true;
d941aeae
CM		 1317#endif
1318#ifdef CONFIG_DMI
fedb25ea 1319static bool si_trydmi = true;
d941aeae 1320#endif
fedb25ea 1321static bool si_tryplatform = true;
f2afae46 1322#ifdef CONFIG_PCI
fedb25ea 1323static bool si_trypci = true;
f2afae46 1324#endif
0dfe6e7e 1325static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
1da177e4
LT		 1326static char *si_type[SI_MAX_PARMS];
1327#define MAX_SI_TYPE_STR 30
1328static char si_type_str[MAX_SI_TYPE_STR];
1329static unsigned long addrs[SI_MAX_PARMS];
64a6f950 1330static unsigned int num_addrs;
1da177e4 1331static unsigned int ports[SI_MAX_PARMS];
64a6f950 1332static unsigned int num_ports;
1da177e4 1333static int irqs[SI_MAX_PARMS];
64a6f950 1334static unsigned int num_irqs;
1da177e4 1335static int regspacings[SI_MAX_PARMS];
64a6f950 1336static unsigned int num_regspacings;
1da177e4 1337static int regsizes[SI_MAX_PARMS];
64a6f950 1338static unsigned int num_regsizes;
1da177e4 1339static int regshifts[SI_MAX_PARMS];
64a6f950 1340static unsigned int num_regshifts;
2f95d513 1341static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */
64a6f950 1342static unsigned int num_slave_addrs;
1da177e4 1343
b361e27b
CM		 1344#define IPMI_IO_ADDR_SPACE 0
1345#define IPMI_MEM_ADDR_SPACE 1
99ee6735 1346static const char * const addr_space_to_str[] = { "i/o", "mem" };
b361e27b
CM		 1347
1348static int hotmod_handler(const char *val, struct kernel_param *kp);
1349
1350module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
1351MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
1352 " Documentation/IPMI.txt in the kernel sources for the"
1353 " gory details.");
1da177e4 1354
d941aeae
CM		 1355#ifdef CONFIG_ACPI
1356module_param_named(tryacpi, si_tryacpi, bool, 0);
1357MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
1358 " default scan of the interfaces identified via ACPI");
1359#endif
1360#ifdef CONFIG_DMI
1361module_param_named(trydmi, si_trydmi, bool, 0);
1362MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
1363 " default scan of the interfaces identified via DMI");
1364#endif
f2afae46 1365module_param_named(tryplatform, si_tryplatform, bool, 0);
f813655a 1366MODULE_PARM_DESC(tryplatform, "Setting this to zero will disable the"
f2afae46
CM		 1367 " default scan of the interfaces identified via platform"
1368 " interfaces like openfirmware");
1369#ifdef CONFIG_PCI
1370module_param_named(trypci, si_trypci, bool, 0);
f813655a 1371MODULE_PARM_DESC(trypci, "Setting this to zero will disable the"
f2afae46
CM		 1372 " default scan of the interfaces identified via pci");
1373#endif
1da177e4
LT		 1374module_param_named(trydefaults, si_trydefaults, bool, 0);
1375MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the"
1376 " default scan of the KCS and SMIC interface at the standard"
1377 " address");
1378module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
1379MODULE_PARM_DESC(type, "Defines the type of each interface, each"
1380 " interface separated by commas. The types are 'kcs',"
1381 " 'smic', and 'bt'. For example si_type=kcs,bt will set"
1382 " the first interface to kcs and the second to bt");
64a6f950 1383module_param_array(addrs, ulong, &num_addrs, 0);
1da177e4
LT		 1384MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
1385 " addresses separated by commas. Only use if an interface"
1386 " is in memory. Otherwise, set it to zero or leave"
1387 " it blank.");
64a6f950 1388module_param_array(ports, uint, &num_ports, 0);
1da177e4
LT		 1389MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
1390 " addresses separated by commas. Only use if an interface"
1391 " is a port. Otherwise, set it to zero or leave"
1392 " it blank.");
1393module_param_array(irqs, int, &num_irqs, 0);
1394MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
1395 " addresses separated by commas. Only use if an interface"
1396 " has an interrupt. Otherwise, set it to zero or leave"
1397 " it blank.");
1398module_param_array(regspacings, int, &num_regspacings, 0);
1399MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
1400 " and each successive register used by the interface. For"
1401 " instance, if the start address is 0xca2 and the spacing"
1402 " is 2, then the second address is at 0xca4. Defaults"
1403 " to 1.");
1404module_param_array(regsizes, int, &num_regsizes, 0);
1405MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
1406 " This should generally be 1, 2, 4, or 8 for an 8-bit,"
1407 " 16-bit, 32-bit, or 64-bit register. Use this if you"
1408 " the 8-bit IPMI register has to be read from a larger"
1409 " register.");
1410module_param_array(regshifts, int, &num_regshifts, 0);
1411MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
1412 " IPMI register, in bits. For instance, if the data"
1413 " is read from a 32-bit word and the IPMI data is in"
1414 " bit 8-15, then the shift would be 8");
1415module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1416MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
1417 " the controller. Normally this is 0x20, but can be"
1418 " overridden by this parm. This is an array indexed"
1419 " by interface number.");
a51f4a81
CM		 1420module_param_array(force_kipmid, int, &num_force_kipmid, 0);
1421MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or"
1422 " disabled(0). Normally the IPMI driver auto-detects"
1423 " this, but the value may be overridden by this parm.");
7aefac26 1424module_param(unload_when_empty, bool, 0);
b361e27b
CM		 1425MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are"
1426 " specified or found, default is 1. Setting to 0"
1427 " is useful for hot add of devices using hotmod.");
ae74e823
MW		 1428module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644);
1429MODULE_PARM_DESC(kipmid_max_busy_us,
1430 "Max time (in microseconds) to busy-wait for IPMI data before"
1431 " sleeping. 0 (default) means to wait forever. Set to 100-500"
1432 " if kipmid is using up a lot of CPU time.");
1da177e4
LT		 1433
1434
b0defcdb 1435static void std_irq_cleanup(struct smi_info *info)
1da177e4 1436{
b0defcdb
CM		 1437 if (info->si_type == SI_BT)
1438 /* Disable the interrupt in the BT interface. */
1439 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0);
1440 free_irq(info->irq, info);
1da177e4 1441}
1da177e4
LT		 1442
1443static int std_irq_setup(struct smi_info *info)
1444{
1445 int rv;
1446
b0defcdb 1447 if (!info->irq)
1da177e4
LT		 1448 return 0;
1449
9dbf68f9
CM		 1450 if (info->si_type == SI_BT) {
1451 rv = request_irq(info->irq,
1452 si_bt_irq_handler,
aa5b2bab 1453 IRQF_SHARED,
9dbf68f9
CM		 1454 DEVICE_NAME,
1455 info);
b0defcdb 1456 if (!rv)
9dbf68f9
CM		 1457 /* Enable the interrupt in the BT interface. */
1458 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG,
1459 IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
1460 } else
1461 rv = request_irq(info->irq,
1462 si_irq_handler,
aa5b2bab 1463 IRQF_SHARED,
9dbf68f9
CM		 1464 DEVICE_NAME,
1465 info);
1da177e4 1466 if (rv) {
279fbd0c
MS		 1467 dev_warn(info->dev, "%s unable to claim interrupt %d,"
1468 " running polled\n",
1469 DEVICE_NAME, info->irq);
1da177e4
LT		 1470 info->irq = 0;
1471 } else {
b0defcdb 1472 info->irq_cleanup = std_irq_cleanup;
279fbd0c 1473 dev_info(info->dev, "Using irq %d\n", info->irq);
1da177e4
LT		 1474 }
1475
1476 return rv;
1477}
1478
81d02b7f 1479static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset)
1da177e4 1480{
b0defcdb 1481 unsigned int addr = io->addr_data;
1da177e4 1482
b0defcdb 1483 return inb(addr + (offset * io->regspacing));
1da177e4
LT		 1484}
1485
81d02b7f 1486static void port_outb(const struct si_sm_io *io, unsigned int offset,
1da177e4
LT		 1487 unsigned char b)
1488{
b0defcdb 1489 unsigned int addr = io->addr_data;
1da177e4 1490
b0defcdb 1491 outb(b, addr + (offset * io->regspacing));
1da177e4
LT		 1492}
1493
81d02b7f 1494static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset)
1da177e4 1495{
b0defcdb 1496 unsigned int addr = io->addr_data;
1da177e4 1497
b0defcdb 1498 return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1da177e4
LT		 1499}
1500
81d02b7f 1501static void port_outw(const struct si_sm_io *io, unsigned int offset,
1da177e4
LT		 1502 unsigned char b)
1503{
b0defcdb 1504 unsigned int addr = io->addr_data;
1da177e4 1505
b0defcdb 1506 outw(b << io->regshift, addr + (offset * io->regspacing));
1da177e4
LT		 1507}
1508
81d02b7f 1509static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset)
1da177e4 1510{
b0defcdb 1511 unsigned int addr = io->addr_data;
1da177e4 1512
b0defcdb 1513 return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
1da177e4
LT		 1514}
1515
81d02b7f 1516static void port_outl(const struct si_sm_io *io, unsigned int offset,
1da177e4
LT		 1517 unsigned char b)
1518{
b0defcdb 1519 unsigned int addr = io->addr_data;
1da177e4 1520
b0defcdb 1521 outl(b << io->regshift, addr+(offset * io->regspacing));
1da177e4
LT		 1522}
1523
1524static void port_cleanup(struct smi_info *info)
1525{
b0defcdb 1526 unsigned int addr = info->io.addr_data;
d61a3ead 1527 int idx;
1da177e4 1528
b0defcdb 1529 if (addr) {
c305e3d3 1530 for (idx = 0; idx < info->io_size; idx++)
d61a3ead
CM		 1531 release_region(addr + idx * info->io.regspacing,
1532 info->io.regsize);
1da177e4 1533 }
1da177e4
LT		 1534}
1535
1536static int port_setup(struct smi_info *info)
1537{
b0defcdb 1538 unsigned int addr = info->io.addr_data;
d61a3ead 1539 int idx;
1da177e4 1540
b0defcdb 1541 if (!addr)
1da177e4
LT		 1542 return -ENODEV;
1543
1544 info->io_cleanup = port_cleanup;
1545
c305e3d3
CM		 1546 /*
1547 * Figure out the actual inb/inw/inl/etc routine to use based
1548 * upon the register size.
1549 */
1da177e4
LT		 1550 switch (info->io.regsize) {
1551 case 1:
1552 info->io.inputb = port_inb;
1553 info->io.outputb = port_outb;
1554 break;
1555 case 2:
1556 info->io.inputb = port_inw;
1557 info->io.outputb = port_outw;
1558 break;
1559 case 4:
1560 info->io.inputb = port_inl;
1561 info->io.outputb = port_outl;
1562 break;
1563 default:
279fbd0c
MS		 1564 dev_warn(info->dev, "Invalid register size: %d\n",
1565 info->io.regsize);
1da177e4
LT		 1566 return -EINVAL;
1567 }
1568
c305e3d3
CM		 1569 /*
1570 * Some BIOSes reserve disjoint I/O regions in their ACPI
d61a3ead
CM		 1571 * tables. This causes problems when trying to register the
1572 * entire I/O region. Therefore we must register each I/O
1573 * port separately.
1574 */
c305e3d3 1575 for (idx = 0; idx < info->io_size; idx++) {
d61a3ead
CM		 1576 if (request_region(addr + idx * info->io.regspacing,
1577 info->io.regsize, DEVICE_NAME) == NULL) {
1578 /* Undo allocations */
76824852 1579 while (idx--)
d61a3ead
CM		 1580 release_region(addr + idx * info->io.regspacing,
1581 info->io.regsize);
d61a3ead
CM		 1582 return -EIO;
1583 }
1584 }
1da177e4
LT		 1585 return 0;
1586}
1587
81d02b7f
CM		 1588static unsigned char intf_mem_inb(const struct si_sm_io *io,
1589 unsigned int offset)
1da177e4
LT		 1590{
1591 return readb((io->addr)+(offset * io->regspacing));
1592}
1593
81d02b7f
CM		 1594static void intf_mem_outb(const struct si_sm_io *io, unsigned int offset,
1595 unsigned char b)
1da177e4
LT		 1596{
1597 writeb(b, (io->addr)+(offset * io->regspacing));
1598}
1599
81d02b7f
CM		 1600static unsigned char intf_mem_inw(const struct si_sm_io *io,
1601 unsigned int offset)
1da177e4
LT		 1602{
1603 return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)
64d9fe69 1604 & 0xff;
1da177e4
LT		 1605}
1606
81d02b7f
CM		 1607static void intf_mem_outw(const struct si_sm_io *io, unsigned int offset,
1608 unsigned char b)
1da177e4
LT		 1609{
1610 writeb(b << io->regshift, (io->addr)+(offset * io->regspacing));
1611}
1612
81d02b7f
CM		 1613static unsigned char intf_mem_inl(const struct si_sm_io *io,
1614 unsigned int offset)
1da177e4
LT		 1615{
1616 return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)
64d9fe69 1617 & 0xff;
1da177e4
LT		 1618}
1619
81d02b7f
CM		 1620static void intf_mem_outl(const struct si_sm_io *io, unsigned int offset,
1621 unsigned char b)
1da177e4
LT		 1622{
1623 writel(b << io->regshift, (io->addr)+(offset * io->regspacing));
1624}
1625
1626#ifdef readq
81d02b7f 1627static unsigned char mem_inq(const struct si_sm_io *io, unsigned int offset)
1da177e4
LT		 1628{
1629 return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)
64d9fe69 1630 & 0xff;
1da177e4
LT		 1631}
1632
81d02b7f 1633static void mem_outq(const struct si_sm_io *io, unsigned int offset,
1da177e4
LT		 1634 unsigned char b)
1635{
1636 writeq(b << io->regshift, (io->addr)+(offset * io->regspacing));
1637}
1638#endif
1639
1640static void mem_cleanup(struct smi_info *info)
1641{
b0defcdb 1642 unsigned long addr = info->io.addr_data;
1da177e4
LT		 1643 int mapsize;
1644
1645 if (info->io.addr) {
1646 iounmap(info->io.addr);
1647
1648 mapsize = ((info->io_size * info->io.regspacing)
1649 - (info->io.regspacing - info->io.regsize));
1650
b0defcdb 1651 release_mem_region(addr, mapsize);
1da177e4 1652 }
1da177e4
LT		 1653}
1654
1655static int mem_setup(struct smi_info *info)
1656{
b0defcdb 1657 unsigned long addr = info->io.addr_data;
1da177e4
LT		 1658 int mapsize;
1659
b0defcdb 1660 if (!addr)
1da177e4
LT		 1661 return -ENODEV;
1662
1663 info->io_cleanup = mem_cleanup;
1664
c305e3d3
CM		 1665 /*
1666 * Figure out the actual readb/readw/readl/etc routine to use based
1667 * upon the register size.
1668 */
1da177e4
LT		 1669 switch (info->io.regsize) {
1670 case 1:
546cfdf4
AD		 1671 info->io.inputb = intf_mem_inb;
1672 info->io.outputb = intf_mem_outb;
1da177e4
LT		 1673 break;
1674 case 2:
546cfdf4
AD		 1675 info->io.inputb = intf_mem_inw;
1676 info->io.outputb = intf_mem_outw;
1da177e4
LT		 1677 break;
1678 case 4:
546cfdf4
AD		 1679 info->io.inputb = intf_mem_inl;
1680 info->io.outputb = intf_mem_outl;
1da177e4
LT		 1681 break;
1682#ifdef readq
1683 case 8:
1684 info->io.inputb = mem_inq;
1685 info->io.outputb = mem_outq;
1686 break;
1687#endif
1688 default:
279fbd0c
MS		 1689 dev_warn(info->dev, "Invalid register size: %d\n",
1690 info->io.regsize);
1da177e4
LT		 1691 return -EINVAL;
1692 }
1693
c305e3d3
CM		 1694 /*
1695 * Calculate the total amount of memory to claim. This is an
1da177e4
LT		 1696 * unusual looking calculation, but it avoids claiming any
1697 * more memory than it has to. It will claim everything
1698 * between the first address to the end of the last full
c305e3d3
CM		 1699 * register.
1700 */
1da177e4
LT		 1701 mapsize = ((info->io_size * info->io.regspacing)
1702 - (info->io.regspacing - info->io.regsize));
1703
b0defcdb 1704 if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL)
1da177e4
LT		 1705 return -EIO;
1706
b0defcdb 1707 info->io.addr = ioremap(addr, mapsize);
1da177e4 1708 if (info->io.addr == NULL) {
b0defcdb 1709 release_mem_region(addr, mapsize);
1da177e4
LT		 1710 return -EIO;
1711 }
1712 return 0;
1713}
1714
b361e27b
CM		 1715/*
1716 * Parms come in as <op1>[:op2[:op3...]]. ops are:
1717 * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
1718 * Options are:
1719 * rsp=<regspacing>
1720 * rsi=<regsize>
1721 * rsh=<regshift>
1722 * irq=<irq>
1723 * ipmb=<ipmb addr>
1724 */
1725enum hotmod_op { HM_ADD, HM_REMOVE };
1726struct hotmod_vals {
99ee6735
LC		 1727 const char *name;
1728 const int val;
b361e27b 1729};
99ee6735
LC		 1730
1731static const struct hotmod_vals hotmod_ops[] = {
b361e27b
CM		 1732 { "add", HM_ADD },
1733 { "remove", HM_REMOVE },
1734 { NULL }
1735};
99ee6735
LC		 1736
1737static const struct hotmod_vals hotmod_si[] = {
b361e27b
CM		 1738 { "kcs", SI_KCS },
1739 { "smic", SI_SMIC },
1740 { "bt", SI_BT },
1741 { NULL }
1742};
99ee6735
LC		 1743
1744static const struct hotmod_vals hotmod_as[] = {
b361e27b
CM		 1745 { "mem", IPMI_MEM_ADDR_SPACE },
1746 { "i/o", IPMI_IO_ADDR_SPACE },
1747 { NULL }
1748};
1d5636cc 1749
99ee6735
LC		 1750static int parse_str(const struct hotmod_vals *v, int *val, char *name,
1751 char **curr)
b361e27b
CM		 1752{
1753 char *s;
1754 int i;
1755
1756 s = strchr(*curr, ',');
1757 if (!s) {
1758 printk(KERN_WARNING PFX "No hotmod %s given.\n", name);
1759 return -EINVAL;
1760 }
1761 *s = '\0';
1762 s++;
ceb51ca8 1763 for (i = 0; v[i].name; i++) {
1d5636cc 1764 if (strcmp(*curr, v[i].name) == 0) {
b361e27b
CM		 1765 *val = v[i].val;
1766 *curr = s;
1767 return 0;
1768 }
1769 }
1770
1771 printk(KERN_WARNING PFX "Invalid hotmod %s '%s'\n", name, *curr);
1772 return -EINVAL;
1773}
1774
1d5636cc
CM		 1775static int check_hotmod_int_op(const char *curr, const char *option,
1776 const char *name, int *val)
1777{
1778 char *n;
1779
1780 if (strcmp(curr, name) == 0) {
1781 if (!option) {
1782 printk(KERN_WARNING PFX
1783 "No option given for '%s'\n",
1784 curr);
1785 return -EINVAL;
1786 }
1787 *val = simple_strtoul(option, &n, 0);
1788 if ((*n != '\0') || (*option == '\0')) {
1789 printk(KERN_WARNING PFX
1790 "Bad option given for '%s'\n",
1791 curr);
1792 return -EINVAL;
1793 }
1794 return 1;
1795 }
1796 return 0;
1797}
1798
de5e2ddf
ED		 1799static struct smi_info *smi_info_alloc(void)
1800{
1801 struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
1802
f60adf42 1803 if (info)
de5e2ddf 1804 spin_lock_init(&info->si_lock);
de5e2ddf
ED		 1805 return info;
1806}
1807
b361e27b
CM		 1808static int hotmod_handler(const char *val, struct kernel_param *kp)
1809{
1810 char *str = kstrdup(val, GFP_KERNEL);
1d5636cc 1811 int rv;
b361e27b
CM		 1812 char *next, *curr, *s, *n, *o;
1813 enum hotmod_op op;
1814 enum si_type si_type;
1815 int addr_space;
1816 unsigned long addr;
1817 int regspacing;
1818 int regsize;
1819 int regshift;
1820 int irq;
1821 int ipmb;
1822 int ival;
1d5636cc 1823 int len;
b361e27b
CM		 1824 struct smi_info *info;
1825
1826 if (!str)
1827 return -ENOMEM;
1828
1829 /* Kill any trailing spaces, as we can get a "\n" from echo. */
1d5636cc
CM		 1830 len = strlen(str);
1831 ival = len - 1;
b361e27b
CM		 1832 while ((ival >= 0) && isspace(str[ival])) {
1833 str[ival] = '\0';
1834 ival--;
1835 }
1836
1837 for (curr = str; curr; curr = next) {
1838 regspacing = 1;
1839 regsize = 1;
1840 regshift = 0;
1841 irq = 0;
2f95d513 1842 ipmb = 0; /* Choose the default if not specified */
b361e27b
CM		 1843
1844 next = strchr(curr, ':');
1845 if (next) {
1846 *next = '\0';
1847 next++;
1848 }
1849
1850 rv = parse_str(hotmod_ops, &ival, "operation", &curr);
1851 if (rv)
1852 break;
1853 op = ival;
1854
1855 rv = parse_str(hotmod_si, &ival, "interface type", &curr);
1856 if (rv)
1857 break;
1858 si_type = ival;
1859
1860 rv = parse_str(hotmod_as, &addr_space, "address space", &curr);
1861 if (rv)
1862 break;
1863
1864 s = strchr(curr, ',');
1865 if (s) {
1866 *s = '\0';
1867 s++;
1868 }
1869 addr = simple_strtoul(curr, &n, 0);
1870 if ((*n != '\0') || (*curr == '\0')) {
1871 printk(KERN_WARNING PFX "Invalid hotmod address"
1872 " '%s'\n", curr);
1873 break;
1874 }
1875
1876 while (s) {
1877 curr = s;
1878 s = strchr(curr, ',');
1879 if (s) {
1880 *s = '\0';
1881 s++;
1882 }
1883 o = strchr(curr, '=');
1884 if (o) {
1885 *o = '\0';
1886 o++;
1887 }
1d5636cc
CM		 1888 rv = check_hotmod_int_op(curr, o, "rsp", &regspacing);
1889 if (rv < 0)
b361e27b 1890 goto out;
1d5636cc
CM		 1891 else if (rv)
1892 continue;
1893 rv = check_hotmod_int_op(curr, o, "rsi", &regsize);
1894 if (rv < 0)
1895 goto out;
1896 else if (rv)
1897 continue;
1898 rv = check_hotmod_int_op(curr, o, "rsh", &regshift);
1899 if (rv < 0)
1900 goto out;
1901 else if (rv)
1902 continue;
1903 rv = check_hotmod_int_op(curr, o, "irq", &irq);
1904 if (rv < 0)
1905 goto out;
1906 else if (rv)
1907 continue;
1908 rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb);
1909 if (rv < 0)
1910 goto out;
1911 else if (rv)
1912 continue;
1913
1914 rv = -EINVAL;
1915 printk(KERN_WARNING PFX
1916 "Invalid hotmod option '%s'\n",
1917 curr);
1918 goto out;
b361e27b
CM		 1919 }
1920
1921 if (op == HM_ADD) {
de5e2ddf 1922 info = smi_info_alloc();
b361e27b
CM		 1923 if (!info) {
1924 rv = -ENOMEM;
1925 goto out;
1926 }
1927
5fedc4a2 1928 info->addr_source = SI_HOTMOD;
b361e27b
CM		 1929 info->si_type = si_type;
1930 info->io.addr_data = addr;
1931 info->io.addr_type = addr_space;
1932 if (addr_space == IPMI_MEM_ADDR_SPACE)
1933 info->io_setup = mem_setup;
1934 else
1935 info->io_setup = port_setup;
1936
1937 info->io.addr = NULL;
1938 info->io.regspacing = regspacing;
1939 if (!info->io.regspacing)
1940 info->io.regspacing = DEFAULT_REGSPACING;
1941 info->io.regsize = regsize;
1942 if (!info->io.regsize)
1943 info->io.regsize = DEFAULT_REGSPACING;
1944 info->io.regshift = regshift;
1945 info->irq = irq;
1946 if (info->irq)
1947 info->irq_setup = std_irq_setup;
1948 info->slave_addr = ipmb;
1949
d02b3709
CM		 1950 rv = add_smi(info);
1951 if (rv) {
7faefea6 1952 kfree(info);
d02b3709
CM		 1953 goto out;
1954 }
1955 rv = try_smi_init(info);
1956 if (rv) {
1957 cleanup_one_si(info);
1958 goto out;
7faefea6 1959 }
b361e27b
CM		 1960 } else {
1961 /* remove */
1962 struct smi_info *e, *tmp_e;
1963
1964 mutex_lock(&smi_infos_lock);
1965 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) {
1966 if (e->io.addr_type != addr_space)
1967 continue;
1968 if (e->si_type != si_type)
1969 continue;
1970 if (e->io.addr_data == addr)
1971 cleanup_one_si(e);
1972 }
1973 mutex_unlock(&smi_infos_lock);
1974 }
1975 }
1d5636cc 1976 rv = len;
76824852 1977out:
b361e27b
CM		 1978 kfree(str);
1979 return rv;
1980}
b0defcdb 1981
2223cbec 1982static int hardcode_find_bmc(void)
1da177e4 1983{
a1e9c9dd 1984 int ret = -ENODEV;
b0defcdb 1985 int i;
1da177e4
LT		 1986 struct smi_info *info;
1987
b0defcdb
CM		 1988 for (i = 0; i < SI_MAX_PARMS; i++) {
1989 if (!ports[i] && !addrs[i])
1990 continue;
1da177e4 1991
de5e2ddf 1992 info = smi_info_alloc();
b0defcdb 1993 if (!info)
a1e9c9dd 1994 return -ENOMEM;
1da177e4 1995
5fedc4a2 1996 info->addr_source = SI_HARDCODED;
279fbd0c 1997 printk(KERN_INFO PFX "probing via hardcoded address\n");
1da177e4 1998
1d5636cc 1999 if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) {
b0defcdb 2000 info->si_type = SI_KCS;
1d5636cc 2001 } else if (strcmp(si_type[i], "smic") == 0) {
b0defcdb 2002 info->si_type = SI_SMIC;
1d5636cc 2003 } else if (strcmp(si_type[i], "bt") == 0) {
b0defcdb
CM		 2004 info->si_type = SI_BT;
2005 } else {
279fbd0c 2006 printk(KERN_WARNING PFX "Interface type specified "
b0defcdb
CM		 2007 "for interface %d, was invalid: %s\n",
2008 i, si_type[i]);
2009 kfree(info);
2010 continue;
2011 }
1da177e4 2012
b0defcdb
CM		 2013 if (ports[i]) {
2014 /* An I/O port */
2015 info->io_setup = port_setup;
2016 info->io.addr_data = ports[i];
2017 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2018 } else if (addrs[i]) {
2019 /* A memory port */
2020 info->io_setup = mem_setup;
2021 info->io.addr_data = addrs[i];
2022 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2023 } else {
279fbd0c
MS		 2024 printk(KERN_WARNING PFX "Interface type specified "
2025 "for interface %d, but port and address were "
2026 "not set or set to zero.\n", i);
b0defcdb
CM		 2027 kfree(info);
2028 continue;
2029 }
1da177e4 2030
b0defcdb
CM		 2031 info->io.addr = NULL;
2032 info->io.regspacing = regspacings[i];
2033 if (!info->io.regspacing)
2034 info->io.regspacing = DEFAULT_REGSPACING;
2035 info->io.regsize = regsizes[i];
2036 if (!info->io.regsize)
2037 info->io.regsize = DEFAULT_REGSPACING;
2038 info->io.regshift = regshifts[i];
2039 info->irq = irqs[i];
2040 if (info->irq)
2041 info->irq_setup = std_irq_setup;
2f95d513 2042 info->slave_addr = slave_addrs[i];
1da177e4 2043
7faefea6 2044 if (!add_smi(info)) {
2407d77a
MG		 2045 if (try_smi_init(info))
2046 cleanup_one_si(info);
a1e9c9dd 2047 ret = 0;
7faefea6
YL		 2048 } else {
2049 kfree(info);
2050 }
b0defcdb 2051 }
a1e9c9dd 2052 return ret;
b0defcdb 2053}
1da177e4 2054
8466361a 2055#ifdef CONFIG_ACPI
1da177e4 2056
c305e3d3
CM		 2057/*
2058 * Once we get an ACPI failure, we don't try any more, because we go
2059 * through the tables sequentially. Once we don't find a table, there
2060 * are no more.
2061 */
0c8204b3 2062static int acpi_failure;
1da177e4
LT		 2063
2064/* For GPE-type interrupts. */
8b6cd8ad
LM		 2065static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
2066 u32 gpe_number, void *context)
1da177e4
LT		 2067{
2068 struct smi_info *smi_info = context;
2069 unsigned long flags;
1da177e4
LT		 2070
2071 spin_lock_irqsave(&(smi_info->si_lock), flags);
2072
64959e2d 2073 smi_inc_stat(smi_info, interrupts);
1da177e4 2074
f93aae9f
JS		 2075 debug_timestamp("ACPI_GPE");
2076
1da177e4 2077 smi_event_handler(smi_info, 0);
1da177e4
LT		 2078 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
2079
2080 return ACPI_INTERRUPT_HANDLED;
2081}
2082
b0defcdb
CM		 2083static void acpi_gpe_irq_cleanup(struct smi_info *info)
2084{
2085 if (!info->irq)
2086 return;
2087
2088 acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe);
2089}
2090
1da177e4
LT		 2091static int acpi_gpe_irq_setup(struct smi_info *info)
2092{
2093 acpi_status status;
2094
b0defcdb 2095 if (!info->irq)
1da177e4
LT		 2096 return 0;
2097
1da177e4
LT		 2098 status = acpi_install_gpe_handler(NULL,
2099 info->irq,
2100 ACPI_GPE_LEVEL_TRIGGERED,
2101 &ipmi_acpi_gpe,
2102 info);
2103 if (status != AE_OK) {
279fbd0c
MS		 2104 dev_warn(info->dev, "%s unable to claim ACPI GPE %d,"
2105 " running polled\n", DEVICE_NAME, info->irq);
1da177e4
LT		 2106 info->irq = 0;
2107 return -EINVAL;
2108 } else {
b0defcdb 2109 info->irq_cleanup = acpi_gpe_irq_cleanup;
279fbd0c 2110 dev_info(info->dev, "Using ACPI GPE %d\n", info->irq);
1da177e4
LT		 2111 return 0;
2112 }
2113}
2114
1da177e4
LT		 2115/*
2116 * Defined at
631dd1a8 2117 * http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf
1da177e4
LT		 2118 */
2119struct SPMITable {
2120 s8 Signature[4];
2121 u32 Length;
2122 u8 Revision;
2123 u8 Checksum;
2124 s8 OEMID[6];
2125 s8 OEMTableID[8];
2126 s8 OEMRevision[4];
2127 s8 CreatorID[4];
2128 s8 CreatorRevision[4];
2129 u8 InterfaceType;
2130 u8 IPMIlegacy;
2131 s16 SpecificationRevision;
2132
2133 /*
2134 * Bit 0 - SCI interrupt supported
2135 * Bit 1 - I/O APIC/SAPIC
2136 */
2137 u8 InterruptType;
2138
c305e3d3
CM		 2139 /*
2140 * If bit 0 of InterruptType is set, then this is the SCI
2141 * interrupt in the GPEx_STS register.
2142 */
1da177e4
LT		 2143 u8 GPE;
2144
2145 s16 Reserved;
2146
c305e3d3
CM		 2147 /*
2148 * If bit 1 of InterruptType is set, then this is the I/O
2149 * APIC/SAPIC interrupt.
2150 */
1da177e4
LT		 2151 u32 GlobalSystemInterrupt;
2152
2153 /* The actual register address. */
2154 struct acpi_generic_address addr;
2155
2156 u8 UID[4];
2157
2158 s8 spmi_id[1]; /* A '\0' terminated array starts here. */
2159};
2160
2223cbec 2161static int try_init_spmi(struct SPMITable *spmi)
1da177e4
LT		 2162{
2163 struct smi_info *info;
d02b3709 2164 int rv;
1da177e4 2165
1da177e4 2166 if (spmi->IPMIlegacy != 1) {
279fbd0c
MS		 2167 printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy);
2168 return -ENODEV;
1da177e4
LT		 2169 }
2170
de5e2ddf 2171 info = smi_info_alloc();
b0defcdb 2172 if (!info) {
279fbd0c 2173 printk(KERN_ERR PFX "Could not allocate SI data (3)\n");
b0defcdb
CM		 2174 return -ENOMEM;
2175 }
2176
5fedc4a2 2177 info->addr_source = SI_SPMI;
279fbd0c 2178 printk(KERN_INFO PFX "probing via SPMI\n");
1da177e4 2179
1da177e4 2180 /* Figure out the interface type. */
c305e3d3 2181 switch (spmi->InterfaceType) {
1da177e4 2182 case 1: /* KCS */
b0defcdb 2183 info->si_type = SI_KCS;
1da177e4 2184 break;
1da177e4 2185 case 2: /* SMIC */
b0defcdb 2186 info->si_type = SI_SMIC;
1da177e4 2187 break;
1da177e4 2188 case 3: /* BT */
b0defcdb 2189 info->si_type = SI_BT;
1da177e4 2190 break;
ab42bf24
CM		 2191 case 4: /* SSIF, just ignore */
2192 kfree(info);
2193 return -EIO;
1da177e4 2194 default:
279fbd0c
MS		 2195 printk(KERN_INFO PFX "Unknown ACPI/SPMI SI type %d\n",
2196 spmi->InterfaceType);
b0defcdb 2197 kfree(info);
1da177e4
LT		 2198 return -EIO;
2199 }
2200
1da177e4
LT		 2201 if (spmi->InterruptType & 1) {
2202 /* We've got a GPE interrupt. */
2203 info->irq = spmi->GPE;
2204 info->irq_setup = acpi_gpe_irq_setup;
1da177e4
LT		 2205 } else if (spmi->InterruptType & 2) {
2206 /* We've got an APIC/SAPIC interrupt. */
2207 info->irq = spmi->GlobalSystemInterrupt;
2208 info->irq_setup = std_irq_setup;
1da177e4
LT		 2209 } else {
2210 /* Use the default interrupt setting. */
2211 info->irq = 0;
2212 info->irq_setup = NULL;
2213 }
2214
15a58ed1 2215 if (spmi->addr.bit_width) {
35bc37a0 2216 /* A (hopefully) properly formed register bit width. */
15a58ed1 2217 info->io.regspacing = spmi->addr.bit_width / 8;
35bc37a0 2218 } else {
35bc37a0
CM		 2219 info->io.regspacing = DEFAULT_REGSPACING;
2220 }
b0defcdb 2221 info->io.regsize = info->io.regspacing;
15a58ed1 2222 info->io.regshift = spmi->addr.bit_offset;
1da177e4 2223
15a58ed1 2224 if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
1da177e4 2225 info->io_setup = mem_setup;
8fe1425a 2226 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
15a58ed1 2227 } else if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
1da177e4 2228 info->io_setup = port_setup;
8fe1425a 2229 info->io.addr_type = IPMI_IO_ADDR_SPACE;
1da177e4
LT		 2230 } else {
2231 kfree(info);
279fbd0c 2232 printk(KERN_WARNING PFX "Unknown ACPI I/O Address type\n");
1da177e4
LT		 2233 return -EIO;
2234 }
b0defcdb 2235 info->io.addr_data = spmi->addr.address;
1da177e4 2236
7bb671e3
YL		 2237 pr_info("ipmi_si: SPMI: %s %#lx regsize %d spacing %d irq %d\n",
2238 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2239 info->io.addr_data, info->io.regsize, info->io.regspacing,
2240 info->irq);
2241
d02b3709
CM		 2242 rv = add_smi(info);
2243 if (rv)
7faefea6 2244 kfree(info);
1da177e4 2245
d02b3709 2246 return rv;
1da177e4 2247}
b0defcdb 2248
2223cbec 2249static void spmi_find_bmc(void)
b0defcdb
CM		 2250{
2251 acpi_status status;
2252 struct SPMITable *spmi;
2253 int i;
2254
2255 if (acpi_disabled)
2256 return;
2257
2258 if (acpi_failure)
2259 return;
2260
2261 for (i = 0; ; i++) {
15a58ed1
AS		 2262 status = acpi_get_table(ACPI_SIG_SPMI, i+1,
2263 (struct acpi_table_header **)&spmi);
b0defcdb
CM		 2264 if (status != AE_OK)
2265 return;
2266
18a3e0bf 2267 try_init_spmi(spmi);
b0defcdb
CM		 2268 }
2269}
1da177e4
LT		 2270#endif
2271
a9fad4cc 2272#ifdef CONFIG_DMI
c305e3d3 2273struct dmi_ipmi_data {
1da177e4
LT		 2274 u8 type;
2275 u8 addr_space;
2276 unsigned long base_addr;
2277 u8 irq;
2278 u8 offset;
2279 u8 slave_addr;
b0defcdb 2280};
1da177e4 2281
2223cbec 2282static int decode_dmi(const struct dmi_header *dm,
b0defcdb 2283 struct dmi_ipmi_data *dmi)
1da177e4 2284{
1855256c 2285 const u8 *data = (const u8 *)dm;
1da177e4
LT		 2286 unsigned long base_addr;
2287 u8 reg_spacing;
b224cd3a 2288 u8 len = dm->length;
1da177e4 2289
b0defcdb 2290 dmi->type = data[4];
1da177e4
LT		 2291
2292 memcpy(&base_addr, data+8, sizeof(unsigned long));
2293 if (len >= 0x11) {
2294 if (base_addr & 1) {
2295 /* I/O */
2296 base_addr &= 0xFFFE;
b0defcdb 2297 dmi->addr_space = IPMI_IO_ADDR_SPACE;
c305e3d3 2298 } else
1da177e4 2299 /* Memory */
b0defcdb 2300 dmi->addr_space = IPMI_MEM_ADDR_SPACE;
c305e3d3 2301
1da177e4
LT		 2302 /* If bit 4 of byte 0x10 is set, then the lsb for the address
2303 is odd. */
b0defcdb 2304 dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
1da177e4 2305
b0defcdb 2306 dmi->irq = data[0x11];
1da177e4
LT		 2307
2308 /* The top two bits of byte 0x10 hold the register spacing. */
b224cd3a 2309 reg_spacing = (data[0x10] & 0xC0) >> 6;
c305e3d3 2310 switch (reg_spacing) {
1da177e4 2311 case 0x00: /* Byte boundaries */
b0defcdb 2312 dmi->offset = 1;
1da177e4
LT		 2313 break;
2314 case 0x01: /* 32-bit boundaries */
b0defcdb 2315 dmi->offset = 4;
1da177e4
LT		 2316 break;
2317 case 0x02: /* 16-byte boundaries */
b0defcdb 2318 dmi->offset = 16;
1da177e4
LT		 2319 break;
2320 default:
2321 /* Some other interface, just ignore it. */
2322 return -EIO;
2323 }
2324 } else {
2325 /* Old DMI spec. */
c305e3d3
CM		 2326 /*
2327 * Note that technically, the lower bit of the base
92068801
CM		 2328 * address should be 1 if the address is I/O and 0 if
2329 * the address is in memory. So many systems get that
2330 * wrong (and all that I have seen are I/O) so we just
2331 * ignore that bit and assume I/O. Systems that use
c305e3d3
CM		 2332 * memory should use the newer spec, anyway.
2333 */
b0defcdb
CM		 2334 dmi->base_addr = base_addr & 0xfffe;
2335 dmi->addr_space = IPMI_IO_ADDR_SPACE;
2336 dmi->offset = 1;
1da177e4
LT		 2337 }
2338
b0defcdb 2339 dmi->slave_addr = data[6];
1da177e4 2340
b0defcdb 2341 return 0;
1da177e4
LT		 2342}
2343
2223cbec 2344static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
1da177e4 2345{
b0defcdb 2346 struct smi_info *info;
1da177e4 2347
de5e2ddf 2348 info = smi_info_alloc();
b0defcdb 2349 if (!info) {
279fbd0c 2350 printk(KERN_ERR PFX "Could not allocate SI data\n");
b0defcdb 2351 return;
1da177e4 2352 }
1da177e4 2353
5fedc4a2 2354 info->addr_source = SI_SMBIOS;
279fbd0c 2355 printk(KERN_INFO PFX "probing via SMBIOS\n");
1da177e4 2356
e8b33617 2357 switch (ipmi_data->type) {
b0defcdb
CM		 2358 case 0x01: /* KCS */
2359 info->si_type = SI_KCS;
2360 break;
2361 case 0x02: /* SMIC */
2362 info->si_type = SI_SMIC;
2363 break;
2364 case 0x03: /* BT */
2365 info->si_type = SI_BT;
2366 break;
2367 default:
80cd6920 2368 kfree(info);
b0defcdb 2369 return;
1da177e4 2370 }
1da177e4 2371
b0defcdb
CM		 2372 switch (ipmi_data->addr_space) {
2373 case IPMI_MEM_ADDR_SPACE:
1da177e4 2374 info->io_setup = mem_setup;
b0defcdb
CM		 2375 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2376 break;
2377
2378 case IPMI_IO_ADDR_SPACE:
1da177e4 2379 info->io_setup = port_setup;
b0defcdb
CM		 2380 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2381 break;
2382
2383 default:
1da177e4 2384 kfree(info);
279fbd0c 2385 printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n",
b0defcdb
CM		 2386 ipmi_data->addr_space);
2387 return;
1da177e4 2388 }
b0defcdb 2389 info->io.addr_data = ipmi_data->base_addr;
1da177e4 2390
b0defcdb
CM		 2391 info->io.regspacing = ipmi_data->offset;
2392 if (!info->io.regspacing)
1da177e4
LT		 2393 info->io.regspacing = DEFAULT_REGSPACING;
2394 info->io.regsize = DEFAULT_REGSPACING;
b0defcdb 2395 info->io.regshift = 0;
1da177e4
LT		 2396
2397 info->slave_addr = ipmi_data->slave_addr;
2398
b0defcdb
CM		 2399 info->irq = ipmi_data->irq;
2400 if (info->irq)
2401 info->irq_setup = std_irq_setup;
1da177e4 2402
7bb671e3
YL		 2403 pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n",
2404 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
2405 info->io.addr_data, info->io.regsize, info->io.regspacing,
2406 info->irq);
2407
7faefea6
YL		 2408 if (add_smi(info))
2409 kfree(info);
b0defcdb 2410}
1da177e4 2411
2223cbec 2412static void dmi_find_bmc(void)
b0defcdb 2413{
1855256c 2414 const struct dmi_device *dev = NULL;
b0defcdb
CM		 2415 struct dmi_ipmi_data data;
2416 int rv;
2417
2418 while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) {
397f4ebf 2419 memset(&data, 0, sizeof(data));
1855256c
JG		 2420 rv = decode_dmi((const struct dmi_header *) dev->device_data,
2421 &data);
b0defcdb
CM		 2422 if (!rv)
2423 try_init_dmi(&data);
2424 }
1da177e4 2425}
a9fad4cc 2426#endif /* CONFIG_DMI */
1da177e4
LT		 2427
2428#ifdef CONFIG_PCI
2429
b0defcdb
CM		 2430#define PCI_ERMC_CLASSCODE 0x0C0700
2431#define PCI_ERMC_CLASSCODE_MASK 0xffffff00
2432#define PCI_ERMC_CLASSCODE_TYPE_MASK 0xff
2433#define PCI_ERMC_CLASSCODE_TYPE_SMIC 0x00
2434#define PCI_ERMC_CLASSCODE_TYPE_KCS 0x01
2435#define PCI_ERMC_CLASSCODE_TYPE_BT 0x02
2436
1da177e4
LT		 2437#define PCI_HP_VENDOR_ID 0x103C
2438#define PCI_MMC_DEVICE_ID 0x121A
2439#define PCI_MMC_ADDR_CW 0x10
2440
b0defcdb
CM		 2441static void ipmi_pci_cleanup(struct smi_info *info)
2442{
2443 struct pci_dev *pdev = info->addr_source_data;
2444
2445 pci_disable_device(pdev);
2446}
1da177e4 2447
2223cbec 2448static int ipmi_pci_probe_regspacing(struct smi_info *info)
a6c16c28
CM		 2449{
2450 if (info->si_type == SI_KCS) {
2451 unsigned char status;
2452 int regspacing;
2453
2454 info->io.regsize = DEFAULT_REGSIZE;
2455 info->io.regshift = 0;
2456 info->io_size = 2;
2457 info->handlers = &kcs_smi_handlers;
2458
2459 /* detect 1, 4, 16byte spacing */
2460 for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
2461 info->io.regspacing = regspacing;
2462 if (info->io_setup(info)) {
2463 dev_err(info->dev,
2464 "Could not setup I/O space\n");
2465 return DEFAULT_REGSPACING;
2466 }
2467 /* write invalid cmd */
2468 info->io.outputb(&info->io, 1, 0x10);
2469 /* read status back */
2470 status = info->io.inputb(&info->io, 1);
2471 info->io_cleanup(info);
2472 if (status)
2473 return regspacing;
2474 regspacing *= 4;
2475 }
2476 }
2477 return DEFAULT_REGSPACING;
2478}
2479
2223cbec 2480static int ipmi_pci_probe(struct pci_dev *pdev,
b0defcdb 2481 const struct pci_device_id *ent)
1da177e4 2482{
b0defcdb
CM		 2483 int rv;
2484 int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
2485 struct smi_info *info;
1da177e4 2486
de5e2ddf 2487 info = smi_info_alloc();
b0defcdb 2488 if (!info)
1cd441f9 2489 return -ENOMEM;
1da177e4 2490
5fedc4a2 2491 info->addr_source = SI_PCI;
279fbd0c 2492 dev_info(&pdev->dev, "probing via PCI");
1da177e4 2493
b0defcdb
CM		 2494 switch (class_type) {
2495 case PCI_ERMC_CLASSCODE_TYPE_SMIC:
2496 info->si_type = SI_SMIC;
2497 break;
1da177e4 2498
b0defcdb
CM		 2499 case PCI_ERMC_CLASSCODE_TYPE_KCS:
2500 info->si_type = SI_KCS;
2501 break;
2502
2503 case PCI_ERMC_CLASSCODE_TYPE_BT:
2504 info->si_type = SI_BT;
2505 break;
2506
2507 default:
2508 kfree(info);
279fbd0c 2509 dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type);
1cd441f9 2510 return -ENOMEM;
1da177e4
LT		 2511 }
2512
b0defcdb
CM		 2513 rv = pci_enable_device(pdev);
2514 if (rv) {
279fbd0c 2515 dev_err(&pdev->dev, "couldn't enable PCI device\n");
b0defcdb
CM		 2516 kfree(info);
2517 return rv;
1da177e4
LT		 2518 }
2519
b0defcdb
CM		 2520 info->addr_source_cleanup = ipmi_pci_cleanup;
2521 info->addr_source_data = pdev;
1da177e4 2522
b0defcdb
CM		 2523 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
2524 info->io_setup = port_setup;
2525 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2526 } else {
2527 info->io_setup = mem_setup;
2528 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
1da177e4 2529 }
b0defcdb 2530 info->io.addr_data = pci_resource_start(pdev, 0);
1da177e4 2531
a6c16c28
CM		 2532 info->io.regspacing = ipmi_pci_probe_regspacing(info);
2533 info->io.regsize = DEFAULT_REGSIZE;
b0defcdb 2534 info->io.regshift = 0;
1da177e4 2535
b0defcdb
CM		 2536 info->irq = pdev->irq;
2537 if (info->irq)
2538 info->irq_setup = std_irq_setup;
1da177e4 2539
50c812b2 2540 info->dev = &pdev->dev;
fca3b747 2541 pci_set_drvdata(pdev, info);
50c812b2 2542
279fbd0c
MS		 2543 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
2544 &pdev->resource[0], info->io.regsize, info->io.regspacing,
2545 info->irq);
2546
d02b3709
CM		 2547 rv = add_smi(info);
2548 if (rv) {
7faefea6 2549 kfree(info);
d02b3709
CM		 2550 pci_disable_device(pdev);
2551 }
7faefea6 2552
d02b3709 2553 return rv;
b0defcdb 2554}
1da177e4 2555
39af33fc 2556static void ipmi_pci_remove(struct pci_dev *pdev)
b0defcdb 2557{
fca3b747
CM		 2558 struct smi_info *info = pci_get_drvdata(pdev);
2559 cleanup_one_si(info);
b0defcdb 2560}
1da177e4 2561
81d02b7f 2562static const struct pci_device_id ipmi_pci_devices[] = {
b0defcdb 2563 { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) },
248bdd5e
KC		 2564 { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) },
2565 { 0, }
b0defcdb
CM		 2566};
2567MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);
2568
2569static struct pci_driver ipmi_pci_driver = {
c305e3d3
CM		 2570 .name = DEVICE_NAME,
2571 .id_table = ipmi_pci_devices,
2572 .probe = ipmi_pci_probe,
bcd2982a 2573 .remove = ipmi_pci_remove,
b0defcdb
CM		 2574};
2575#endif /* CONFIG_PCI */
1da177e4 2576
a1e9c9dd 2577#ifdef CONFIG_OF
0fbcf4af
CM		 2578static const struct of_device_id of_ipmi_match[] = {
2579 { .type = "ipmi", .compatible = "ipmi-kcs",
2580 .data = (void *)(unsigned long) SI_KCS },
2581 { .type = "ipmi", .compatible = "ipmi-smic",
2582 .data = (void *)(unsigned long) SI_SMIC },
2583 { .type = "ipmi", .compatible = "ipmi-bt",
2584 .data = (void *)(unsigned long) SI_BT },
2585 {},
2586};
66f44018 2587MODULE_DEVICE_TABLE(of, of_ipmi_match);
0fbcf4af
CM		 2588
2589static int of_ipmi_probe(struct platform_device *dev)
2590{
b1608d69 2591 const struct of_device_id *match;
dba9b4f6
CM		 2592 struct smi_info *info;
2593 struct resource resource;
da81c3b9 2594 const __be32 *regsize, *regspacing, *regshift;
61c7a080 2595 struct device_node *np = dev->dev.of_node;
dba9b4f6
CM		 2596 int ret;
2597 int proplen;
2598
279fbd0c 2599 dev_info(&dev->dev, "probing via device tree\n");
dba9b4f6 2600
0fbcf4af 2601 match = of_match_device(of_ipmi_match, &dev->dev);
b1608d69 2602 if (!match)
0fbcf4af 2603 return -ENODEV;
a1e9c9dd 2604
08dc4169
BH		 2605 if (!of_device_is_available(np))
2606 return -EINVAL;
2607
dba9b4f6
CM		 2608 ret = of_address_to_resource(np, 0, &resource);
2609 if (ret) {
2610 dev_warn(&dev->dev, PFX "invalid address from OF\n");
2611 return ret;
2612 }
2613
9c25099d 2614 regsize = of_get_property(np, "reg-size", &proplen);
dba9b4f6
CM		 2615 if (regsize && proplen != 4) {
2616 dev_warn(&dev->dev, PFX "invalid regsize from OF\n");
2617 return -EINVAL;
2618 }
2619
9c25099d 2620 regspacing = of_get_property(np, "reg-spacing", &proplen);
dba9b4f6
CM		 2621 if (regspacing && proplen != 4) {
2622 dev_warn(&dev->dev, PFX "invalid regspacing from OF\n");
2623 return -EINVAL;
2624 }
2625
9c25099d 2626 regshift = of_get_property(np, "reg-shift", &proplen);
dba9b4f6
CM		 2627 if (regshift && proplen != 4) {
2628 dev_warn(&dev->dev, PFX "invalid regshift from OF\n");
2629 return -EINVAL;
2630 }
2631
de5e2ddf 2632 info = smi_info_alloc();
dba9b4f6
CM		 2633
2634 if (!info) {
2635 dev_err(&dev->dev,
279fbd0c 2636 "could not allocate memory for OF probe\n");
dba9b4f6
CM		 2637 return -ENOMEM;
2638 }
2639
b1608d69 2640 info->si_type = (enum si_type) match->data;
5fedc4a2 2641 info->addr_source = SI_DEVICETREE;
dba9b4f6
CM		 2642 info->irq_setup = std_irq_setup;
2643
3b7ec117
NC		 2644 if (resource.flags & IORESOURCE_IO) {
2645 info->io_setup = port_setup;
2646 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2647 } else {
2648 info->io_setup = mem_setup;
2649 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2650 }
2651
dba9b4f6
CM		 2652 info->io.addr_data = resource.start;
2653
da81c3b9
RH		 2654 info->io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
2655 info->io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
2656 info->io.regshift = regshift ? be32_to_cpup(regshift) : 0;
dba9b4f6 2657
61c7a080 2658 info->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
dba9b4f6
CM		 2659 info->dev = &dev->dev;
2660
279fbd0c 2661 dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
dba9b4f6
CM		 2662 info->io.addr_data, info->io.regsize, info->io.regspacing,
2663 info->irq);
2664
9de33df4 2665 dev_set_drvdata(&dev->dev, info);
dba9b4f6 2666
d02b3709
CM		 2667 ret = add_smi(info);
2668 if (ret) {
7faefea6 2669 kfree(info);
d02b3709 2670 return ret;
7faefea6 2671 }
7faefea6 2672 return 0;
dba9b4f6 2673}
0fbcf4af
CM		 2674#else
2675#define of_ipmi_match NULL
2676static int of_ipmi_probe(struct platform_device *dev)
2677{
2678 return -ENODEV;
2679}
2680#endif
dba9b4f6 2681
0fbcf4af
CM		 2682#ifdef CONFIG_ACPI
2683static int acpi_ipmi_probe(struct platform_device *dev)
dba9b4f6 2684{
0fbcf4af
CM		 2685 struct smi_info *info;
2686 struct resource *res, *res_second;
2687 acpi_handle handle;
2688 acpi_status status;
2689 unsigned long long tmp;
2690 int rv = -EINVAL;
2691
9f0257b3
JL		 2692 if (!si_tryacpi)
2693 return 0;
2694
0fbcf4af
CM		 2695 handle = ACPI_HANDLE(&dev->dev);
2696 if (!handle)
2697 return -ENODEV;
2698
2699 info = smi_info_alloc();
2700 if (!info)
2701 return -ENOMEM;
2702
2703 info->addr_source = SI_ACPI;
2704 dev_info(&dev->dev, PFX "probing via ACPI\n");
2705
2706 info->addr_info.acpi_info.acpi_handle = handle;
2707
2708 /* _IFT tells us the interface type: KCS, BT, etc */
2709 status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
2710 if (ACPI_FAILURE(status)) {
2711 dev_err(&dev->dev, "Could not find ACPI IPMI interface type\n");
2712 goto err_free;
2713 }
2714
2715 switch (tmp) {
2716 case 1:
2717 info->si_type = SI_KCS;
2718 break;
2719 case 2:
2720 info->si_type = SI_SMIC;
2721 break;
2722 case 3:
2723 info->si_type = SI_BT;
2724 break;
2725 case 4: /* SSIF, just ignore */
2726 rv = -ENODEV;
2727 goto err_free;
2728 default:
2729 dev_info(&dev->dev, "unknown IPMI type %lld\n", tmp);
2730 goto err_free;
2731 }
2732
2733 res = platform_get_resource(dev, IORESOURCE_IO, 0);
2734 if (res) {
2735 info->io_setup = port_setup;
2736 info->io.addr_type = IPMI_IO_ADDR_SPACE;
2737 } else {
2738 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
2739 if (res) {
2740 info->io_setup = mem_setup;
2741 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2742 }
2743 }
2744 if (!res) {
2745 dev_err(&dev->dev, "no I/O or memory address\n");
2746 goto err_free;
2747 }
2748 info->io.addr_data = res->start;
2749
2750 info->io.regspacing = DEFAULT_REGSPACING;
2751 res_second = platform_get_resource(dev,
2752 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ?
2753 IORESOURCE_IO : IORESOURCE_MEM,
2754 1);
2755 if (res_second) {
2756 if (res_second->start > info->io.addr_data)
2757 info->io.regspacing =
2758 res_second->start - info->io.addr_data;
2759 }
2760 info->io.regsize = DEFAULT_REGSPACING;
2761 info->io.regshift = 0;
2762
2763 /* If _GPE exists, use it; otherwise use standard interrupts */
2764 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
2765 if (ACPI_SUCCESS(status)) {
2766 info->irq = tmp;
2767 info->irq_setup = acpi_gpe_irq_setup;
2768 } else {
2769 int irq = platform_get_irq(dev, 0);
2770
2771 if (irq > 0) {
2772 info->irq = irq;
2773 info->irq_setup = std_irq_setup;
2774 }
2775 }
2776
2777 info->dev = &dev->dev;
2778 platform_set_drvdata(dev, info);
2779
2780 dev_info(info->dev, "%pR regsize %d spacing %d irq %d\n",
2781 res, info->io.regsize, info->io.regspacing,
2782 info->irq);
2783
2784 rv = add_smi(info);
2785 if (rv)
2786 kfree(info);
2787
2788 return rv;
2789
2790err_free:
2791 kfree(info);
2792 return rv;
2793}
2794
81d02b7f 2795static const struct acpi_device_id acpi_ipmi_match[] = {
0fbcf4af
CM		 2796 { "IPI0001", 0 },
2797 { },
2798};
2799MODULE_DEVICE_TABLE(acpi, acpi_ipmi_match);
2800#else
2801static int acpi_ipmi_probe(struct platform_device *dev)
2802{
2803 return -ENODEV;
2804}
a1e9c9dd 2805#endif
0fbcf4af
CM		 2806
2807static int ipmi_probe(struct platform_device *dev)
2808{
2809 if (of_ipmi_probe(dev) == 0)
2810 return 0;
2811
2812 return acpi_ipmi_probe(dev);
dba9b4f6
CM		 2813}
2814
0fbcf4af 2815static int ipmi_remove(struct platform_device *dev)
dba9b4f6 2816{
0fbcf4af
CM		 2817 struct smi_info *info = dev_get_drvdata(&dev->dev);
2818
a7930899 2819 cleanup_one_si(info);
0fbcf4af
CM		 2820 return 0;
2821}
dba9b4f6 2822
a1e9c9dd 2823static struct platform_driver ipmi_driver = {
4018294b 2824 .driver = {
a1e9c9dd 2825 .name = DEVICE_NAME,
0fbcf4af
CM		 2826 .of_match_table = of_ipmi_match,
2827 .acpi_match_table = ACPI_PTR(acpi_ipmi_match),
4018294b 2828 },
a1e9c9dd 2829 .probe = ipmi_probe,
bcd2982a 2830 .remove = ipmi_remove,
dba9b4f6 2831};
dba9b4f6 2832
fdbeb7de
TB		 2833#ifdef CONFIG_PARISC
2834static int ipmi_parisc_probe(struct parisc_device *dev)
2835{
2836 struct smi_info *info;
dfa19426 2837 int rv;
fdbeb7de
TB		 2838
2839 info = smi_info_alloc();
2840
2841 if (!info) {
2842 dev_err(&dev->dev,
2843 "could not allocate memory for PARISC probe\n");
2844 return -ENOMEM;
2845 }
2846
2847 info->si_type = SI_KCS;
2848 info->addr_source = SI_DEVICETREE;
2849 info->io_setup = mem_setup;
2850 info->io.addr_type = IPMI_MEM_ADDR_SPACE;
2851 info->io.addr_data = dev->hpa.start;
2852 info->io.regsize = 1;
2853 info->io.regspacing = 1;
2854 info->io.regshift = 0;
2855 info->irq = 0; /* no interrupt */
2856 info->irq_setup = NULL;
2857 info->dev = &dev->dev;
2858
2859 dev_dbg(&dev->dev, "addr 0x%lx\n", info->io.addr_data);
2860
2861 dev_set_drvdata(&dev->dev, info);
2862
d02b3709
CM		 2863 rv = add_smi(info);
2864 if (rv) {
fdbeb7de 2865 kfree(info);
d02b3709 2866 return rv;
fdbeb7de
TB		 2867 }
2868
2869 return 0;
2870}
2871
2872static int ipmi_parisc_remove(struct parisc_device *dev)
2873{
2874 cleanup_one_si(dev_get_drvdata(&dev->dev));
2875 return 0;
2876}
2877
99ee6735 2878static const struct parisc_device_id ipmi_parisc_tbl[] = {
fdbeb7de
TB		 2879 { HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 },
2880 { 0, }
2881};
2882
2883static struct parisc_driver ipmi_parisc_driver = {
2884 .name = "ipmi",
2885 .id_table = ipmi_parisc_tbl,
2886 .probe = ipmi_parisc_probe,
2887 .remove = ipmi_parisc_remove,
2888};
2889#endif /* CONFIG_PARISC */
2890
40112ae7 2891static int wait_for_msg_done(struct smi_info *smi_info)
1da177e4 2892{
50c812b2 2893 enum si_sm_result smi_result;
1da177e4
LT		 2894
2895 smi_result = smi_info->handlers->event(smi_info->si_sm, 0);
c305e3d3 2896 for (;;) {
c3e7e791
CM		 2897 if (smi_result == SI_SM_CALL_WITH_DELAY ||
2898 smi_result == SI_SM_CALL_WITH_TICK_DELAY) {
da4cd8df 2899 schedule_timeout_uninterruptible(1);
1da177e4 2900 smi_result = smi_info->handlers->event(
e21404dc 2901 smi_info->si_sm, jiffies_to_usecs(1));
c305e3d3 2902 } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) {
1da177e4
LT		 2903 smi_result = smi_info->handlers->event(
2904 smi_info->si_sm, 0);
c305e3d3 2905 } else
1da177e4
LT		 2906 break;
2907 }
40112ae7 2908 if (smi_result == SI_SM_HOSED)
c305e3d3
CM		 2909 /*
2910 * We couldn't get the state machine to run, so whatever's at
2911 * the port is probably not an IPMI SMI interface.
2912 */
40112ae7
CM		 2913 return -ENODEV;
2914
2915 return 0;
2916}
2917
2918static int try_get_dev_id(struct smi_info *smi_info)
2919{
2920 unsigned char msg[2];
2921 unsigned char *resp;
2922 unsigned long resp_len;
2923 int rv = 0;
2924
2925 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2926 if (!resp)
2927 return -ENOMEM;
2928
2929 /*
2930 * Do a Get Device ID command, since it comes back with some
2931 * useful info.
2932 */
2933 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2934 msg[1] = IPMI_GET_DEVICE_ID_CMD;
2935 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2936
2937 rv = wait_for_msg_done(smi_info);
2938 if (rv)
1da177e4 2939 goto out;
1da177e4 2940
1da177e4
LT		 2941 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2942 resp, IPMI_MAX_MSG_LENGTH);
1da177e4 2943
d8c98618
CM		 2944 /* Check and record info from the get device id, in case we need it. */
2945 rv = ipmi_demangle_device_id(resp, resp_len, &smi_info->device_id);
1da177e4 2946
76824852 2947out:
1da177e4
LT		 2948 kfree(resp);
2949 return rv;
2950}
2951
d0882897 2952static int get_global_enables(struct smi_info *smi_info, u8 *enables)
1e7d6a45
CM		 2953{
2954 unsigned char msg[3];
2955 unsigned char *resp;
2956 unsigned long resp_len;
2957 int rv;
2958
2959 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
d0882897
CM		 2960 if (!resp)
2961 return -ENOMEM;
1e7d6a45
CM		 2962
2963 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2964 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
2965 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2966
2967 rv = wait_for_msg_done(smi_info);
2968 if (rv) {
d0882897
CM		 2969 dev_warn(smi_info->dev,
2970 "Error getting response from get global enables command: %d\n",
2971 rv);
1e7d6a45
CM		 2972 goto out;
2973 }
2974
2975 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2976 resp, IPMI_MAX_MSG_LENGTH);
2977
2978 if (resp_len < 4 ||
2979 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2980 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
2981 resp[2] != 0) {
d0882897
CM		 2982 dev_warn(smi_info->dev,
2983 "Invalid return from get global enables command: %ld %x %x %x\n",
2984 resp_len, resp[0], resp[1], resp[2]);
1e7d6a45
CM		 2985 rv = -EINVAL;
2986 goto out;
d0882897
CM		 2987 } else {
2988 *enables = resp[3];
1e7d6a45
CM		 2989 }
2990
d0882897
CM		 2991out:
2992 kfree(resp);
2993 return rv;
2994}
2995
2996/*
2997 * Returns 1 if it gets an error from the command.
2998 */
2999static int set_global_enables(struct smi_info *smi_info, u8 enables)
3000{
3001 unsigned char msg[3];
3002 unsigned char *resp;
3003 unsigned long resp_len;
3004 int rv;
3005
3006 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
3007 if (!resp)
3008 return -ENOMEM;
1e7d6a45
CM		 3009
3010 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
3011 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
d0882897 3012 msg[2] = enables;
1e7d6a45
CM		 3013 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
3014
3015 rv = wait_for_msg_done(smi_info);
3016 if (rv) {
d0882897
CM		 3017 dev_warn(smi_info->dev,
3018 "Error getting response from set global enables command: %d\n",
3019 rv);
1e7d6a45
CM		 3020 goto out;
3021 }
3022
3023 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
3024 resp, IPMI_MAX_MSG_LENGTH);
3025
3026 if (resp_len < 3 ||
3027 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
3028 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
d0882897
CM		 3029 dev_warn(smi_info->dev,
3030 "Invalid return from set global enables command: %ld %x %x\n",
3031 resp_len, resp[0], resp[1]);
1e7d6a45
CM		 3032 rv = -EINVAL;
3033 goto out;
3034 }
3035
d0882897
CM		 3036 if (resp[2] != 0)
3037 rv = 1;
3038
3039out:
3040 kfree(resp);
3041 return rv;
3042}
3043
3044/*
3045 * Some BMCs do not support clearing the receive irq bit in the global
3046 * enables (even if they don't support interrupts on the BMC). Check
3047 * for this and handle it properly.
3048 */
3049static void check_clr_rcv_irq(struct smi_info *smi_info)
3050{
3051 u8 enables = 0;
3052 int rv;
3053
3054 rv = get_global_enables(smi_info, &enables);
3055 if (!rv) {
3056 if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0)
3057 /* Already clear, should work ok. */
3058 return;
3059
3060 enables &= ~IPMI_BMC_RCV_MSG_INTR;
3061 rv = set_global_enables(smi_info, enables);
3062 }
3063
3064 if (rv < 0) {
3065 dev_err(smi_info->dev,
3066 "Cannot check clearing the rcv irq: %d\n", rv);
3067 return;
3068 }
3069
3070 if (rv) {
1e7d6a45
CM		 3071 /*
3072 * An error when setting the event buffer bit means
3073 * clearing the bit is not supported.
3074 */
d0882897
CM		 3075 dev_warn(smi_info->dev,
3076 "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n");
3077 smi_info->cannot_disable_irq = true;
3078 }
3079}
3080
3081/*
3082 * Some BMCs do not support setting the interrupt bits in the global
3083 * enables even if they support interrupts. Clearly bad, but we can
3084 * compensate.
3085 */
3086static void check_set_rcv_irq(struct smi_info *smi_info)
3087{
3088 u8 enables = 0;
3089 int rv;
3090
3091 if (!smi_info->irq)
3092 return;
3093
3094 rv = get_global_enables(smi_info, &enables);
3095 if (!rv) {
3096 enables |= IPMI_BMC_RCV_MSG_INTR;
3097 rv = set_global_enables(smi_info, enables);
3098 }
3099
3100 if (rv < 0) {
3101 dev_err(smi_info->dev,
3102 "Cannot check setting the rcv irq: %d\n", rv);
3103 return;
3104 }
3105
3106 if (rv) {
3107 /*
3108 * An error when setting the event buffer bit means
3109 * setting the bit is not supported.
3110 */
3111 dev_warn(smi_info->dev,
3112 "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n");
3113 smi_info->cannot_disable_irq = true;
3114 smi_info->irq_enable_broken = true;
1e7d6a45 3115 }
1e7d6a45
CM		 3116}
3117
40112ae7
CM		 3118static int try_enable_event_buffer(struct smi_info *smi_info)
3119{
3120 unsigned char msg[3];
3121 unsigned char *resp;
3122 unsigned long resp_len;
3123 int rv = 0;
3124
3125 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
3126 if (!resp)
3127 return -ENOMEM;
3128
3129 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
3130 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
3131 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
3132
3133 rv = wait_for_msg_done(smi_info);
3134 if (rv) {
279fbd0c
MS		 3135 printk(KERN_WARNING PFX "Error getting response from get"
3136 " global enables command, the event buffer is not"
40112ae7
CM		 3137 " enabled.\n");
3138 goto out;
3139 }
3140
3141 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
3142 resp, IPMI_MAX_MSG_LENGTH);
3143
3144 if (resp_len < 4 ||
3145 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
3146 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
3147 resp[2] != 0) {
279fbd0c
MS		 3148 printk(KERN_WARNING PFX "Invalid return from get global"
3149 " enables command, cannot enable the event buffer.\n");
40112ae7
CM		 3150 rv = -EINVAL;
3151 goto out;
3152 }
3153
d9b7e4f7 3154 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
40112ae7 3155 /* buffer is already enabled, nothing to do. */
d9b7e4f7 3156 smi_info->supports_event_msg_buff = true;
40112ae7 3157 goto out;
d9b7e4f7 3158 }
40112ae7
CM		 3159
3160 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
3161 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
3162 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF;
3163 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
3164
3165 rv = wait_for_msg_done(smi_info);
3166 if (rv) {
279fbd0c
MS		 3167 printk(KERN_WARNING PFX "Error getting response from set"
3168 " global, enables command, the event buffer is not"
40112ae7
CM		 3169 " enabled.\n");
3170 goto out;
3171 }
3172
3173 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
3174 resp, IPMI_MAX_MSG_LENGTH);
3175
3176 if (resp_len < 3 ||
3177 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
3178 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
279fbd0c
MS		 3179 printk(KERN_WARNING PFX "Invalid return from get global,"
3180 "enables command, not enable the event buffer.\n");
40112ae7
CM		 3181 rv = -EINVAL;
3182 goto out;
3183 }
3184
3185 if (resp[2] != 0)
3186 /*
3187 * An error when setting the event buffer bit means
3188 * that the event buffer is not supported.
3189 */
3190 rv = -ENOENT;
d9b7e4f7
CM		 3191 else
3192 smi_info->supports_event_msg_buff = true;
3193
76824852 3194out:
40112ae7
CM		 3195 kfree(resp);
3196 return rv;
3197}
3198
07412736 3199static int smi_type_proc_show(struct seq_file *m, void *v)
1da177e4 3200{
07412736 3201 struct smi_info *smi = m->private;
1da177e4 3202
d6c5dc18
JP		 3203 seq_printf(m, "%s\n", si_to_str[smi->si_type]);
3204
5e33cd0c 3205 return 0;
1da177e4
LT		 3206}
3207
07412736 3208static int smi_type_proc_open(struct inode *inode, struct file *file)
1da177e4 3209{
d9dda78b 3210 return single_open(file, smi_type_proc_show, PDE_DATA(inode));
07412736
AD		 3211}
3212
3213static const struct file_operations smi_type_proc_ops = {
3214 .open = smi_type_proc_open,
3215 .read = seq_read,
3216 .llseek = seq_lseek,
3217 .release = single_release,
3218};
3219
3220static int smi_si_stats_proc_show(struct seq_file *m, void *v)
3221{
3222 struct smi_info *smi = m->private;
1da177e4 3223
07412736 3224 seq_printf(m, "interrupts_enabled: %d\n",
b0defcdb 3225 smi->irq && !smi->interrupt_disabled);
07412736 3226 seq_printf(m, "short_timeouts: %u\n",
64959e2d 3227 smi_get_stat(smi, short_timeouts));
07412736 3228 seq_printf(m, "long_timeouts: %u\n",
64959e2d 3229 smi_get_stat(smi, long_timeouts));
07412736 3230 seq_printf(m, "idles: %u\n",
64959e2d 3231 smi_get_stat(smi, idles));
07412736 3232 seq_printf(m, "interrupts: %u\n",
64959e2d 3233 smi_get_stat(smi, interrupts));
07412736 3234 seq_printf(m, "attentions: %u\n",
64959e2d 3235 smi_get_stat(smi, attentions));
07412736 3236 seq_printf(m, "flag_fetches: %u\n",
64959e2d 3237 smi_get_stat(smi, flag_fetches));
07412736 3238 seq_printf(m, "hosed_count: %u\n",
64959e2d 3239 smi_get_stat(smi, hosed_count));
07412736 3240 seq_printf(m, "complete_transactions: %u\n",
64959e2d 3241 smi_get_stat(smi, complete_transactions));
07412736 3242 seq_printf(m, "events: %u\n",
64959e2d 3243 smi_get_stat(smi, events));
07412736 3244 seq_printf(m, "watchdog_pretimeouts: %u\n",
64959e2d 3245 smi_get_stat(smi, watchdog_pretimeouts));
07412736 3246 seq_printf(m, "incoming_messages: %u\n",
64959e2d 3247 smi_get_stat(smi, incoming_messages));
07412736
AD		 3248 return 0;
3249}
1da177e4 3250
07412736
AD		 3251static int smi_si_stats_proc_open(struct inode *inode, struct file *file)
3252{
d9dda78b 3253 return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode));
b361e27b
CM		 3254}
3255
07412736
AD		 3256static const struct file_operations smi_si_stats_proc_ops = {
3257 .open = smi_si_stats_proc_open,
3258 .read = seq_read,
3259 .llseek = seq_lseek,
3260 .release = single_release,
3261};
3262
3263static int smi_params_proc_show(struct seq_file *m, void *v)
b361e27b 3264{
07412736 3265 struct smi_info *smi = m->private;
b361e27b 3266
d6c5dc18
JP		 3267 seq_printf(m,
3268 "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n",
3269 si_to_str[smi->si_type],
3270 addr_space_to_str[smi->io.addr_type],
3271 smi->io.addr_data,
3272 smi->io.regspacing,
3273 smi->io.regsize,
3274 smi->io.regshift,
3275 smi->irq,
3276 smi->slave_addr);
3277
5e33cd0c 3278 return 0;
1da177e4
LT		 3279}
3280
07412736
AD		 3281static int smi_params_proc_open(struct inode *inode, struct file *file)
3282{
d9dda78b 3283 return single_open(file, smi_params_proc_show, PDE_DATA(inode));
07412736
AD		 3284}
3285
3286static const struct file_operations smi_params_proc_ops = {
3287 .open = smi_params_proc_open,
3288 .read = seq_read,
3289 .llseek = seq_lseek,
3290 .release = single_release,
3291};
3292
3ae0e0f9
CM		 3293/*
3294 * oem_data_avail_to_receive_msg_avail
3295 * @info - smi_info structure with msg_flags set
3296 *
3297 * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL
3298 * Returns 1 indicating need to re-run handle_flags().
3299 */
3300static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info)
3301{
e8b33617 3302 smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) |
c305e3d3 3303 RECEIVE_MSG_AVAIL);
3ae0e0f9
CM		 3304 return 1;
3305}
3306
3307/*
3308 * setup_dell_poweredge_oem_data_handler
3309 * @info - smi_info.device_id must be populated
3310 *
3311 * Systems that match, but have firmware version < 1.40 may assert
3312 * OEM0_DATA_AVAIL on their own, without being told via Set Flags that
3313 * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL
3314 * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags
3315 * as RECEIVE_MSG_AVAIL instead.
3316 *
3317 * As Dell has no plans to release IPMI 1.5 firmware that *ever*
3318 * assert the OEM[012] bits, and if it did, the driver would have to
3319 * change to handle that properly, we don't actually check for the
3320 * firmware version.
3321 * Device ID = 0x20 BMC on PowerEdge 8G servers
3322 * Device Revision = 0x80
3323 * Firmware Revision1 = 0x01 BMC version 1.40
3324 * Firmware Revision2 = 0x40 BCD encoded
3325 * IPMI Version = 0x51 IPMI 1.5
3326 * Manufacturer ID = A2 02 00 Dell IANA
3327 *
d5a2b89a
CM		 3328 * Additionally, PowerEdge systems with IPMI < 1.5 may also assert
3329 * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL.
3330 *
3ae0e0f9
CM		 3331 */
3332#define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20
3333#define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80
3334#define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51
50c812b2 3335#define DELL_IANA_MFR_ID 0x0002a2
3ae0e0f9
CM		 3336static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info)
3337{
3338 struct ipmi_device_id *id = &smi_info->device_id;
50c812b2 3339 if (id->manufacturer_id == DELL_IANA_MFR_ID) {
d5a2b89a
CM		 3340 if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID &&
3341 id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV &&
50c812b2 3342 id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) {
d5a2b89a
CM		 3343 smi_info->oem_data_avail_handler =
3344 oem_data_avail_to_receive_msg_avail;
c305e3d3
CM		 3345 } else if (ipmi_version_major(id) < 1 ||
3346 (ipmi_version_major(id) == 1 &&
3347 ipmi_version_minor(id) < 5)) {
d5a2b89a
CM		 3348 smi_info->oem_data_avail_handler =
3349 oem_data_avail_to_receive_msg_avail;
3350 }
3ae0e0f9
CM		 3351 }
3352}
3353
ea94027b
CM		 3354#define CANNOT_RETURN_REQUESTED_LENGTH 0xCA
3355static void return_hosed_msg_badsize(struct smi_info *smi_info)
3356{
3357 struct ipmi_smi_msg *msg = smi_info->curr_msg;
3358
25985edc 3359 /* Make it a response */
ea94027b
CM		 3360 msg->rsp[0] = msg->data[0] | 4;
3361 msg->rsp[1] = msg->data[1];
3362 msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH;
3363 msg->rsp_size = 3;
3364 smi_info->curr_msg = NULL;
3365 deliver_recv_msg(smi_info, msg);
3366}
3367
3368/*
3369 * dell_poweredge_bt_xaction_handler
3370 * @info - smi_info.device_id must be populated
3371 *
3372 * Dell PowerEdge servers with the BT interface (x6xx and 1750) will
3373 * not respond to a Get SDR command if the length of the data
3374 * requested is exactly 0x3A, which leads to command timeouts and no
3375 * data returned. This intercepts such commands, and causes userspace
3376 * callers to try again with a different-sized buffer, which succeeds.
3377 */
3378
3379#define STORAGE_NETFN 0x0A
3380#define STORAGE_CMD_GET_SDR 0x23
3381static int dell_poweredge_bt_xaction_handler(struct notifier_block *self,
3382 unsigned long unused,
3383 void *in)
3384{
3385 struct smi_info *smi_info = in;
3386 unsigned char *data = smi_info->curr_msg->data;
3387 unsigned int size = smi_info->curr_msg->data_size;
3388 if (size >= 8 &&
3389 (data[0]>>2) == STORAGE_NETFN &&
3390 data[1] == STORAGE_CMD_GET_SDR &&
3391 data[7] == 0x3A) {
3392 return_hosed_msg_badsize(smi_info);
3393 return NOTIFY_STOP;
3394 }
3395 return NOTIFY_DONE;
3396}
3397
3398static struct notifier_block dell_poweredge_bt_xaction_notifier = {
3399 .notifier_call = dell_poweredge_bt_xaction_handler,
3400};
3401
3402/*
3403 * setup_dell_poweredge_bt_xaction_handler
3404 * @info - smi_info.device_id must be filled in already
3405 *
3406 * Fills in smi_info.device_id.start_transaction_pre_hook
3407 * when we know what function to use there.
3408 */
3409static void
3410setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info)
3411{
3412 struct ipmi_device_id *id = &smi_info->device_id;
50c812b2 3413 if (id->manufacturer_id == DELL_IANA_MFR_ID &&
ea94027b
CM		 3414 smi_info->si_type == SI_BT)
3415 register_xaction_notifier(&dell_poweredge_bt_xaction_notifier);
3416}
3417
3ae0e0f9
CM		 3418/*
3419 * setup_oem_data_handler
3420 * @info - smi_info.device_id must be filled in already
3421 *
3422 * Fills in smi_info.device_id.oem_data_available_handler
3423 * when we know what function to use there.
3424 */
3425
3426static void setup_oem_data_handler(struct smi_info *smi_info)
3427{
3428 setup_dell_poweredge_oem_data_handler(smi_info);
3429}
3430
ea94027b
CM		 3431static void setup_xaction_handlers(struct smi_info *smi_info)
3432{
3433 setup_dell_poweredge_bt_xaction_handler(smi_info);
3434}
3435
d0882897
CM		 3436static void check_for_broken_irqs(struct smi_info *smi_info)
3437{
3438 check_clr_rcv_irq(smi_info);
3439 check_set_rcv_irq(smi_info);
3440}
3441
a9a2c44f
CM		 3442static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
3443{
b874b985
CM		 3444 if (smi_info->thread != NULL)
3445 kthread_stop(smi_info->thread);
3446 if (smi_info->timer_running)
453823ba 3447 del_timer_sync(&smi_info->si_timer);
a9a2c44f
CM		 3448}
3449
81d02b7f 3450static const struct ipmi_default_vals
b0defcdb 3451{
99ee6735
LC		 3452 const int type;
3453 const int port;
7420884c 3454} ipmi_defaults[] =
b0defcdb
CM		 3455{
3456 { .type = SI_KCS, .port = 0xca2 },
3457 { .type = SI_SMIC, .port = 0xca9 },
3458 { .type = SI_BT, .port = 0xe4 },
3459 { .port = 0 }
3460};
3461
2223cbec 3462static void default_find_bmc(void)
b0defcdb
CM		 3463{
3464 struct smi_info *info;
3465 int i;
3466
3467 for (i = 0; ; i++) {
3468 if (!ipmi_defaults[i].port)
3469 break;
68e1ee62 3470#ifdef CONFIG_PPC
4ff31d77
CK		 3471 if (check_legacy_ioport(ipmi_defaults[i].port))
3472 continue;
3473#endif
de5e2ddf 3474 info = smi_info_alloc();
a09f4855
AM		 3475 if (!info)
3476 return;
4ff31d77 3477
5fedc4a2 3478 info->addr_source = SI_DEFAULT;
b0defcdb
CM		 3479
3480 info->si_type = ipmi_defaults[i].type;
3481 info->io_setup = port_setup;
3482 info->io.addr_data = ipmi_defaults[i].port;
3483 info->io.addr_type = IPMI_IO_ADDR_SPACE;
3484
3485 info->io.addr = NULL;
3486 info->io.regspacing = DEFAULT_REGSPACING;
3487 info->io.regsize = DEFAULT_REGSPACING;
3488 info->io.regshift = 0;
3489
2407d77a
MG		 3490 if (add_smi(info) == 0) {
3491 if ((try_smi_init(info)) == 0) {
3492 /* Found one... */
279fbd0c 3493 printk(KERN_INFO PFX "Found default %s"
2407d77a
MG		 3494 " state machine at %s address 0x%lx\n",
3495 si_to_str[info->si_type],
3496 addr_space_to_str[info->io.addr_type],
3497 info->io.addr_data);
3498 } else
3499 cleanup_one_si(info);
7faefea6
YL		 3500 } else {
3501 kfree(info);
b0defcdb
CM		 3502 }
3503 }
3504}
3505
3506static int is_new_interface(struct smi_info *info)
1da177e4 3507{
b0defcdb 3508 struct smi_info *e;
1da177e4 3509
b0defcdb
CM		 3510 list_for_each_entry(e, &smi_infos, link) {
3511 if (e->io.addr_type != info->io.addr_type)
3512 continue;
3513 if (e->io.addr_data == info->io.addr_data)
3514 return 0;
3515 }
1da177e4 3516
b0defcdb
CM		 3517 return 1;
3518}
1da177e4 3519
2407d77a 3520static int add_smi(struct smi_info *new_smi)
b0defcdb 3521{
2407d77a 3522 int rv = 0;
b0defcdb 3523
279fbd0c 3524 printk(KERN_INFO PFX "Adding %s-specified %s state machine",
7e50387b
CM		 3525 ipmi_addr_src_to_str(new_smi->addr_source),
3526 si_to_str[new_smi->si_type]);
d6dfd131 3527 mutex_lock(&smi_infos_lock);
b0defcdb 3528 if (!is_new_interface(new_smi)) {
7bb671e3 3529 printk(KERN_CONT " duplicate interface\n");
b0defcdb
CM		 3530 rv = -EBUSY;
3531 goto out_err;
3532 }
1da177e4 3533
2407d77a
MG		 3534 printk(KERN_CONT "\n");
3535
1da177e4
LT		 3536 /* So we know not to free it unless we have allocated one. */
3537 new_smi->intf = NULL;
3538 new_smi->si_sm = NULL;
3539 new_smi->handlers = NULL;
3540
2407d77a
MG		 3541 list_add_tail(&new_smi->link, &smi_infos);
3542
3543out_err:
3544 mutex_unlock(&smi_infos_lock);
3545 return rv;
3546}
3547
3548static int try_smi_init(struct smi_info *new_smi)
3549{
3550 int rv = 0;
3551 int i;
3552
279fbd0c 3553 printk(KERN_INFO PFX "Trying %s-specified %s state"
2407d77a
MG		 3554 " machine at %s address 0x%lx, slave address 0x%x,"
3555 " irq %d\n",
7e50387b 3556 ipmi_addr_src_to_str(new_smi->addr_source),
2407d77a
MG		 3557 si_to_str[new_smi->si_type],
3558 addr_space_to_str[new_smi->io.addr_type],
3559 new_smi->io.addr_data,
3560 new_smi->slave_addr, new_smi->irq);
3561
b0defcdb
CM		 3562 switch (new_smi->si_type) {
3563 case SI_KCS:
1da177e4 3564 new_smi->handlers = &kcs_smi_handlers;
b0defcdb
CM		 3565 break;
3566
3567 case SI_SMIC:
1da177e4 3568 new_smi->handlers = &smic_smi_handlers;
b0defcdb
CM		 3569 break;
3570
3571 case SI_BT:
1da177e4 3572 new_smi->handlers = &bt_smi_handlers;
b0defcdb
CM		 3573 break;
3574
3575 default:
1da177e4
LT		 3576 /* No support for anything else yet. */
3577 rv = -EIO;
3578 goto out_err;
3579 }
3580
3581 /* Allocate the state machine's data and initialize it. */
3582 new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL);
b0defcdb 3583 if (!new_smi->si_sm) {
279fbd0c
MS		 3584 printk(KERN_ERR PFX
3585 "Could not allocate state machine memory\n");
1da177e4
LT		 3586 rv = -ENOMEM;
3587 goto out_err;
3588 }
3589 new_smi->io_size = new_smi->handlers->init_data(new_smi->si_sm,
3590 &new_smi->io);
3591
3592 /* Now that we know the I/O size, we can set up the I/O. */
3593 rv = new_smi->io_setup(new_smi);
3594 if (rv) {
279fbd0c 3595 printk(KERN_ERR PFX "Could not set up I/O space\n");
1da177e4
LT		 3596 goto out_err;
3597 }
3598
1da177e4
LT		 3599 /* Do low-level detection first. */
3600 if (new_smi->handlers->detect(new_smi->si_sm)) {
b0defcdb 3601 if (new_smi->addr_source)
279fbd0c 3602 printk(KERN_INFO PFX "Interface detection failed\n");
1da177e4
LT		 3603 rv = -ENODEV;
3604 goto out_err;
3605 }
3606
c305e3d3
CM		 3607 /*
3608 * Attempt a get device id command. If it fails, we probably
3609 * don't have a BMC here.
3610 */
1da177e4 3611 rv = try_get_dev_id(new_smi);
b0defcdb
CM		 3612 if (rv) {
3613 if (new_smi->addr_source)
279fbd0c 3614 printk(KERN_INFO PFX "There appears to be no BMC"
b0defcdb 3615 " at this location\n");
1da177e4 3616 goto out_err;
b0defcdb 3617 }
1da177e4 3618
3ae0e0f9 3619 setup_oem_data_handler(new_smi);
ea94027b 3620 setup_xaction_handlers(new_smi);
d0882897 3621 check_for_broken_irqs(new_smi);
3ae0e0f9 3622
b874b985 3623 new_smi->waiting_msg = NULL;
1da177e4
LT		 3624 new_smi->curr_msg = NULL;
3625 atomic_set(&new_smi->req_events, 0);
7aefac26 3626 new_smi->run_to_completion = false;
64959e2d
CM		 3627 for (i = 0; i < SI_NUM_STATS; i++)
3628 atomic_set(&new_smi->stats[i], 0);
1da177e4 3629
7aefac26 3630 new_smi->interrupt_disabled = true;
89986496 3631 atomic_set(&new_smi->need_watch, 0);
b0defcdb
CM		 3632 new_smi->intf_num = smi_num;
3633 smi_num++;
1da177e4 3634
40112ae7
CM		 3635 rv = try_enable_event_buffer(new_smi);
3636 if (rv == 0)
7aefac26 3637 new_smi->has_event_buffer = true;
40112ae7 3638
c305e3d3
CM		 3639 /*
3640 * Start clearing the flags before we enable interrupts or the
3641 * timer to avoid racing with the timer.
3642 */
0cfec916 3643 start_clear_flags(new_smi, false);
d9b7e4f7
CM		 3644
3645 /*
3646 * IRQ is defined to be set when non-zero. req_events will
3647 * cause a global flags check that will enable interrupts.
3648 */
3649 if (new_smi->irq) {
3650 new_smi->interrupt_disabled = false;
3651 atomic_set(&new_smi->req_events, 1);
3652 }
1da177e4 3653
50c812b2 3654 if (!new_smi->dev) {
c305e3d3
CM		 3655 /*
3656 * If we don't already have a device from something
3657 * else (like PCI), then register a new one.
3658 */
50c812b2
CM		 3659 new_smi->pdev = platform_device_alloc("ipmi_si",
3660 new_smi->intf_num);
8b32b5d0 3661 if (!new_smi->pdev) {
279fbd0c
MS		 3662 printk(KERN_ERR PFX
3663 "Unable to allocate platform device\n");
453823ba 3664 goto out_err;
50c812b2
CM		 3665 }
3666 new_smi->dev = &new_smi->pdev->dev;
fe2d5ffc 3667 new_smi->dev->driver = &ipmi_driver.driver;
50c812b2 3668
b48f5457 3669 rv = platform_device_add(new_smi->pdev);
50c812b2 3670 if (rv) {
279fbd0c
MS		 3671 printk(KERN_ERR PFX
3672 "Unable to register system interface device:"
50c812b2
CM		 3673 " %d\n",
3674 rv);
453823ba 3675 goto out_err;
50c812b2 3676 }
7aefac26 3677 new_smi->dev_registered = true;
50c812b2
CM		 3678 }
3679
1da177e4
LT		 3680 rv = ipmi_register_smi(&handlers,
3681 new_smi,
50c812b2
CM		 3682 &new_smi->device_id,
3683 new_smi->dev,
453823ba 3684 new_smi->slave_addr);
1da177e4 3685 if (rv) {
279fbd0c
MS		 3686 dev_err(new_smi->dev, "Unable to register device: error %d\n",
3687 rv);
1da177e4
LT		 3688 goto out_err_stop_timer;
3689 }
3690
3691 rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
07412736 3692 &smi_type_proc_ops,
99b76233 3693 new_smi);
1da177e4 3694 if (rv) {
279fbd0c 3695 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
1da177e4
LT		 3696 goto out_err_stop_timer;
3697 }
3698
3699 rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
07412736 3700 &smi_si_stats_proc_ops,
99b76233 3701 new_smi);
1da177e4 3702 if (rv) {
279fbd0c 3703 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
1da177e4
LT		 3704 goto out_err_stop_timer;
3705 }
3706
b361e27b 3707 rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
07412736 3708 &smi_params_proc_ops,
99b76233 3709 new_smi);
b361e27b 3710 if (rv) {
279fbd0c 3711 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
b361e27b
CM		 3712 goto out_err_stop_timer;
3713 }
3714
279fbd0c
MS		 3715 dev_info(new_smi->dev, "IPMI %s interface initialized\n",
3716 si_to_str[new_smi->si_type]);
1da177e4
LT		 3717
3718 return 0;
3719
76824852 3720out_err_stop_timer:
a9a2c44f 3721 wait_for_timer_and_thread(new_smi);
1da177e4 3722
76824852 3723out_err:
7aefac26 3724 new_smi->interrupt_disabled = true;
2407d77a
MG		 3725
3726 if (new_smi->intf) {
b874b985 3727 ipmi_smi_t intf = new_smi->intf;
2407d77a 3728 new_smi->intf = NULL;
b874b985 3729 ipmi_unregister_smi(intf);
2407d77a 3730 }
1da177e4 3731
2407d77a 3732 if (new_smi->irq_cleanup) {
b0defcdb 3733 new_smi->irq_cleanup(new_smi);
2407d77a
MG		 3734 new_smi->irq_cleanup = NULL;
3735 }
1da177e4 3736
c305e3d3
CM		 3737 /*
3738 * Wait until we know that we are out of any interrupt
3739 * handlers might have been running before we freed the
3740 * interrupt.
3741 */
fbd568a3 3742 synchronize_sched();
1da177e4
LT		 3743
3744 if (new_smi->si_sm) {
3745 if (new_smi->handlers)
3746 new_smi->handlers->cleanup(new_smi->si_sm);
3747 kfree(new_smi->si_sm);
2407d77a 3748 new_smi->si_sm = NULL;
1da177e4 3749 }
2407d77a 3750 if (new_smi->addr_source_cleanup) {
b0defcdb 3751 new_smi->addr_source_cleanup(new_smi);
2407d77a
MG		 3752 new_smi->addr_source_cleanup = NULL;
3753 }
3754 if (new_smi->io_cleanup) {
7767e126 3755 new_smi->io_cleanup(new_smi);
2407d77a
MG		 3756 new_smi->io_cleanup = NULL;
3757 }
1da177e4 3758
2407d77a 3759 if (new_smi->dev_registered) {
50c812b2 3760 platform_device_unregister(new_smi->pdev);
7aefac26 3761 new_smi->dev_registered = false;
2407d77a 3762 }
b0defcdb 3763
1da177e4
LT		 3764 return rv;
3765}
3766
2223cbec 3767static int init_ipmi_si(void)
1da177e4 3768{
1da177e4
LT		 3769 int i;
3770 char *str;
50c812b2 3771 int rv;
2407d77a 3772 struct smi_info *e;
06ee4594 3773 enum ipmi_addr_src type = SI_INVALID;
1da177e4
LT		 3774
3775 if (initialized)
3776 return 0;
3777 initialized = 1;
3778
f2afae46
CM		 3779 if (si_tryplatform) {
3780 rv = platform_driver_register(&ipmi_driver);
3781 if (rv) {
3782 printk(KERN_ERR PFX "Unable to register "
3783 "driver: %d\n", rv);
3784 return rv;
3785 }
50c812b2
CM		 3786 }
3787
1da177e4
LT		 3788 /* Parse out the si_type string into its components. */
3789 str = si_type_str;
3790 if (*str != '\0') {
e8b33617 3791 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
1da177e4
LT		 3792 si_type[i] = str;
3793 str = strchr(str, ',');
3794 if (str) {
3795 *str = '\0';
3796 str++;
3797 } else {
3798 break;
3799 }
3800 }
3801 }
3802
1fdd75bd 3803 printk(KERN_INFO "IPMI System Interface driver.\n");
1da177e4 3804
d8cc5267 3805 /* If the user gave us a device, they presumably want us to use it */
a1e9c9dd 3806 if (!hardcode_find_bmc())
d8cc5267 3807 return 0;
d8cc5267 3808
b0defcdb 3809#ifdef CONFIG_PCI
f2afae46
CM		 3810 if (si_trypci) {
3811 rv = pci_register_driver(&ipmi_pci_driver);
3812 if (rv)
3813 printk(KERN_ERR PFX "Unable to register "
3814 "PCI driver: %d\n", rv);
3815 else
7aefac26 3816 pci_registered = true;
f2afae46 3817 }
b0defcdb
CM		 3818#endif
3819
754d4531 3820#ifdef CONFIG_DMI
d941aeae
CM		 3821 if (si_trydmi)
3822 dmi_find_bmc();
754d4531
MG		 3823#endif
3824
3825#ifdef CONFIG_ACPI
d941aeae
CM		 3826 if (si_tryacpi)
3827 spmi_find_bmc();
754d4531
MG		 3828#endif
3829
fdbeb7de
TB		 3830#ifdef CONFIG_PARISC
3831 register_parisc_driver(&ipmi_parisc_driver);
7aefac26 3832 parisc_registered = true;
fdbeb7de
TB		 3833 /* poking PC IO addresses will crash machine, don't do it */
3834 si_trydefaults = 0;
3835#endif
3836
06ee4594
MG		 3837 /* We prefer devices with interrupts, but in the case of a machine
3838 with multiple BMCs we assume that there will be several instances
3839 of a given type so if we succeed in registering a type then also
3840 try to register everything else of the same type */
d8cc5267 3841
2407d77a
MG		 3842 mutex_lock(&smi_infos_lock);
3843 list_for_each_entry(e, &smi_infos, link) {
06ee4594
MG		 3844 /* Try to register a device if it has an IRQ and we either
3845 haven't successfully registered a device yet or this
3846 device has the same type as one we successfully registered */
3847 if (e->irq && (!type || e->addr_source == type)) {
d8cc5267 3848 if (!try_smi_init(e)) {
06ee4594 3849 type = e->addr_source;
d8cc5267
MG		 3850 }
3851 }
3852 }
3853
06ee4594
MG		 3854 /* type will only have been set if we successfully registered an si */
3855 if (type) {
3856 mutex_unlock(&smi_infos_lock);
3857 return 0;
3858 }
3859
d8cc5267
MG		 3860 /* Fall back to the preferred device */
3861
3862 list_for_each_entry(e, &smi_infos, link) {
06ee4594 3863 if (!e->irq && (!type || e->addr_source == type)) {
d8cc5267 3864 if (!try_smi_init(e)) {
06ee4594 3865 type = e->addr_source;
d8cc5267
MG		 3866 }
3867 }
2407d77a
MG		 3868 }
3869 mutex_unlock(&smi_infos_lock);
3870
06ee4594
MG		 3871 if (type)
3872 return 0;
3873
b0defcdb 3874 if (si_trydefaults) {
d6dfd131 3875 mutex_lock(&smi_infos_lock);
b0defcdb
CM		 3876 if (list_empty(&smi_infos)) {
3877 /* No BMC was found, try defaults. */
d6dfd131 3878 mutex_unlock(&smi_infos_lock);
b0defcdb 3879 default_find_bmc();
2407d77a 3880 } else
d6dfd131 3881 mutex_unlock(&smi_infos_lock);
1da177e4
LT		 3882 }
3883
d6dfd131 3884 mutex_lock(&smi_infos_lock);
b361e27b 3885 if (unload_when_empty && list_empty(&smi_infos)) {
d6dfd131 3886 mutex_unlock(&smi_infos_lock);
d2478521 3887 cleanup_ipmi_si();
279fbd0c
MS		 3888 printk(KERN_WARNING PFX
3889 "Unable to find any System Interface(s)\n");
1da177e4 3890 return -ENODEV;
b0defcdb 3891 } else {
d6dfd131 3892 mutex_unlock(&smi_infos_lock);
b0defcdb 3893 return 0;
1da177e4 3894 }
1da177e4
LT		 3895}
3896module_init(init_ipmi_si);
3897
b361e27b 3898static void cleanup_one_si(struct smi_info *to_clean)
1da177e4 3899{
2407d77a 3900 int rv = 0;
1da177e4 3901
b0defcdb 3902 if (!to_clean)
1da177e4
LT		 3903 return;
3904
b874b985
CM		 3905 if (to_clean->intf) {
3906 ipmi_smi_t intf = to_clean->intf;
3907
3908 to_clean->intf = NULL;
3909 rv = ipmi_unregister_smi(intf);
3910 if (rv) {
3911 pr_err(PFX "Unable to unregister device: errno=%d\n",
3912 rv);
3913 }
3914 }
3915
567eded9
TI		 3916 if (to_clean->dev)
3917 dev_set_drvdata(to_clean->dev, NULL);
3918
b0defcdb
CM		 3919 list_del(&to_clean->link);
3920
c305e3d3 3921 /*
b874b985
CM		 3922 * Make sure that interrupts, the timer and the thread are
3923 * stopped and will not run again.
c305e3d3 3924 */
b874b985
CM		 3925 if (to_clean->irq_cleanup)
3926 to_clean->irq_cleanup(to_clean);
a9a2c44f 3927 wait_for_timer_and_thread(to_clean);
1da177e4 3928
c305e3d3
CM		 3929 /*
3930 * Timeouts are stopped, now make sure the interrupts are off
b874b985
CM		 3931 * in the BMC. Note that timers and CPU interrupts are off,
3932 * so no need for locks.
c305e3d3 3933 */
ee6cd5f8 3934 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
ee6cd5f8
CM		 3935 poll(to_clean);
3936 schedule_timeout_uninterruptible(1);
ee6cd5f8 3937 }
0cfec916 3938 disable_si_irq(to_clean, false);
e8b33617 3939 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
1da177e4 3940 poll(to_clean);
da4cd8df 3941 schedule_timeout_uninterruptible(1);
1da177e4
LT		 3942 }
3943
2407d77a
MG		 3944 if (to_clean->handlers)
3945 to_clean->handlers->cleanup(to_clean->si_sm);
1da177e4
LT		 3946
3947 kfree(to_clean->si_sm);
3948
b0defcdb
CM		 3949 if (to_clean->addr_source_cleanup)
3950 to_clean->addr_source_cleanup(to_clean);
7767e126
PG		 3951 if (to_clean->io_cleanup)
3952 to_clean->io_cleanup(to_clean);
50c812b2
CM		 3953
3954 if (to_clean->dev_registered)
3955 platform_device_unregister(to_clean->pdev);
3956
3957 kfree(to_clean);
1da177e4
LT		 3958}
3959
0dcf334c 3960static void cleanup_ipmi_si(void)
1da177e4 3961{
b0defcdb 3962 struct smi_info *e, *tmp_e;
1da177e4 3963
b0defcdb 3964 if (!initialized)
1da177e4
LT		 3965 return;
3966
b0defcdb 3967#ifdef CONFIG_PCI
56480287
MG		 3968 if (pci_registered)
3969 pci_unregister_driver(&ipmi_pci_driver);
b0defcdb 3970#endif
fdbeb7de
TB		 3971#ifdef CONFIG_PARISC
3972 if (parisc_registered)
3973 unregister_parisc_driver(&ipmi_parisc_driver);
3974#endif
b0defcdb 3975
a1e9c9dd 3976 platform_driver_unregister(&ipmi_driver);
dba9b4f6 3977
d6dfd131 3978 mutex_lock(&smi_infos_lock);
b0defcdb
CM		 3979 list_for_each_entry_safe(e, tmp_e, &smi_infos, link)
3980 cleanup_one_si(e);
d6dfd131 3981 mutex_unlock(&smi_infos_lock);
1da177e4
LT		 3982}
3983module_exit(cleanup_ipmi_si);
3984
3985MODULE_LICENSE("GPL");
1fdd75bd 3986MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
c305e3d3
CM		 3987MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT"
3988 " system interfaces.");
Linux 6.x block layer and io_uring tree(s)