Commit | Line | Data |
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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> | |
1da177e4 | 52 | #include <linux/ioport.h> |
ea94027b | 53 | #include <linux/notifier.h> |
b0defcdb | 54 | #include <linux/mutex.h> |
e9a705a0 | 55 | #include <linux/kthread.h> |
1da177e4 | 56 | #include <asm/irq.h> |
1da177e4 LT |
57 | #include <linux/interrupt.h> |
58 | #include <linux/rcupdate.h> | |
16f4232c | 59 | #include <linux/ipmi.h> |
1da177e4 LT |
60 | #include <linux/ipmi_smi.h> |
61 | #include <asm/io.h> | |
1e89a499 | 62 | #include "ipmi_si.h" |
b361e27b CM |
63 | #include <linux/string.h> |
64 | #include <linux/ctype.h> | |
dba9b4f6 | 65 | |
b361e27b | 66 | #define PFX "ipmi_si: " |
1da177e4 LT |
67 | |
68 | /* Measure times between events in the driver. */ | |
69 | #undef DEBUG_TIMING | |
70 | ||
71 | /* Call every 10 ms. */ | |
72 | #define SI_TIMEOUT_TIME_USEC 10000 | |
73 | #define SI_USEC_PER_JIFFY (1000000/HZ) | |
74 | #define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY) | |
75 | #define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a | |
c305e3d3 | 76 | short timeout */ |
1da177e4 LT |
77 | |
78 | enum si_intf_state { | |
79 | SI_NORMAL, | |
80 | SI_GETTING_FLAGS, | |
81 | SI_GETTING_EVENTS, | |
82 | SI_CLEARING_FLAGS, | |
1da177e4 | 83 | SI_GETTING_MESSAGES, |
d9b7e4f7 CM |
84 | SI_CHECKING_ENABLES, |
85 | SI_SETTING_ENABLES | |
1da177e4 LT |
86 | /* FIXME - add watchdog stuff. */ |
87 | }; | |
88 | ||
9dbf68f9 CM |
89 | /* Some BT-specific defines we need here. */ |
90 | #define IPMI_BT_INTMASK_REG 2 | |
91 | #define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2 | |
92 | #define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1 | |
93 | ||
99ee6735 | 94 | static const char * const si_to_str[] = { "kcs", "smic", "bt" }; |
1da177e4 | 95 | |
bb398a4c CM |
96 | static int initialized; |
97 | ||
64959e2d CM |
98 | /* |
99 | * Indexes into stats[] in smi_info below. | |
100 | */ | |
ba8ff1c6 CM |
101 | enum si_stat_indexes { |
102 | /* | |
103 | * Number of times the driver requested a timer while an operation | |
104 | * was in progress. | |
105 | */ | |
106 | SI_STAT_short_timeouts = 0, | |
107 | ||
108 | /* | |
109 | * Number of times the driver requested a timer while nothing was in | |
110 | * progress. | |
111 | */ | |
112 | SI_STAT_long_timeouts, | |
113 | ||
114 | /* Number of times the interface was idle while being polled. */ | |
115 | SI_STAT_idles, | |
116 | ||
117 | /* Number of interrupts the driver handled. */ | |
118 | SI_STAT_interrupts, | |
119 | ||
120 | /* Number of time the driver got an ATTN from the hardware. */ | |
121 | SI_STAT_attentions, | |
64959e2d | 122 | |
ba8ff1c6 CM |
123 | /* Number of times the driver requested flags from the hardware. */ |
124 | SI_STAT_flag_fetches, | |
125 | ||
126 | /* Number of times the hardware didn't follow the state machine. */ | |
127 | SI_STAT_hosed_count, | |
128 | ||
129 | /* Number of completed messages. */ | |
130 | SI_STAT_complete_transactions, | |
131 | ||
132 | /* Number of IPMI events received from the hardware. */ | |
133 | SI_STAT_events, | |
134 | ||
135 | /* Number of watchdog pretimeouts. */ | |
136 | SI_STAT_watchdog_pretimeouts, | |
137 | ||
b3834be5 | 138 | /* Number of asynchronous messages received. */ |
ba8ff1c6 CM |
139 | SI_STAT_incoming_messages, |
140 | ||
141 | ||
142 | /* This *must* remain last, add new values above this. */ | |
143 | SI_NUM_STATS | |
144 | }; | |
64959e2d | 145 | |
c305e3d3 | 146 | struct smi_info { |
a9a2c44f | 147 | int intf_num; |
1da177e4 LT |
148 | ipmi_smi_t intf; |
149 | struct si_sm_data *si_sm; | |
81d02b7f | 150 | const struct si_sm_handlers *handlers; |
1da177e4 | 151 | spinlock_t si_lock; |
b874b985 | 152 | struct ipmi_smi_msg *waiting_msg; |
1da177e4 LT |
153 | struct ipmi_smi_msg *curr_msg; |
154 | enum si_intf_state si_state; | |
155 | ||
c305e3d3 CM |
156 | /* |
157 | * Used to handle the various types of I/O that can occur with | |
158 | * IPMI | |
159 | */ | |
1da177e4 | 160 | struct si_sm_io io; |
1da177e4 | 161 | |
c305e3d3 CM |
162 | /* |
163 | * Per-OEM handler, called from handle_flags(). Returns 1 | |
164 | * when handle_flags() needs to be re-run or 0 indicating it | |
165 | * set si_state itself. | |
166 | */ | |
3ae0e0f9 CM |
167 | int (*oem_data_avail_handler)(struct smi_info *smi_info); |
168 | ||
c305e3d3 CM |
169 | /* |
170 | * Flags from the last GET_MSG_FLAGS command, used when an ATTN | |
171 | * is set to hold the flags until we are done handling everything | |
172 | * from the flags. | |
173 | */ | |
1da177e4 LT |
174 | #define RECEIVE_MSG_AVAIL 0x01 |
175 | #define EVENT_MSG_BUFFER_FULL 0x02 | |
176 | #define WDT_PRE_TIMEOUT_INT 0x08 | |
3ae0e0f9 CM |
177 | #define OEM0_DATA_AVAIL 0x20 |
178 | #define OEM1_DATA_AVAIL 0x40 | |
179 | #define OEM2_DATA_AVAIL 0x80 | |
180 | #define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \ | |
c305e3d3 CM |
181 | OEM1_DATA_AVAIL | \ |
182 | OEM2_DATA_AVAIL) | |
1da177e4 LT |
183 | unsigned char msg_flags; |
184 | ||
40112ae7 | 185 | /* Does the BMC have an event buffer? */ |
7aefac26 | 186 | bool has_event_buffer; |
40112ae7 | 187 | |
c305e3d3 CM |
188 | /* |
189 | * If set to true, this will request events the next time the | |
190 | * state machine is idle. | |
191 | */ | |
1da177e4 LT |
192 | atomic_t req_events; |
193 | ||
c305e3d3 CM |
194 | /* |
195 | * If true, run the state machine to completion on every send | |
196 | * call. Generally used after a panic to make sure stuff goes | |
197 | * out. | |
198 | */ | |
7aefac26 | 199 | bool run_to_completion; |
1da177e4 | 200 | |
1da177e4 LT |
201 | /* The timer for this si. */ |
202 | struct timer_list si_timer; | |
203 | ||
48e8ac29 BS |
204 | /* This flag is set, if the timer is running (timer_pending() isn't enough) */ |
205 | bool timer_running; | |
206 | ||
1da177e4 LT |
207 | /* The time (in jiffies) the last timeout occurred at. */ |
208 | unsigned long last_timeout_jiffies; | |
209 | ||
89986496 CM |
210 | /* Are we waiting for the events, pretimeouts, received msgs? */ |
211 | atomic_t need_watch; | |
212 | ||
c305e3d3 CM |
213 | /* |
214 | * The driver will disable interrupts when it gets into a | |
215 | * situation where it cannot handle messages due to lack of | |
216 | * memory. Once that situation clears up, it will re-enable | |
217 | * interrupts. | |
218 | */ | |
7aefac26 | 219 | bool interrupt_disabled; |
1da177e4 | 220 | |
d9b7e4f7 CM |
221 | /* |
222 | * Does the BMC support events? | |
223 | */ | |
224 | bool supports_event_msg_buff; | |
225 | ||
1e7d6a45 | 226 | /* |
d0882897 CM |
227 | * Can we disable interrupts the global enables receive irq |
228 | * bit? There are currently two forms of brokenness, some | |
229 | * systems cannot disable the bit (which is technically within | |
230 | * the spec but a bad idea) and some systems have the bit | |
231 | * forced to zero even though interrupts work (which is | |
232 | * clearly outside the spec). The next bool tells which form | |
233 | * of brokenness is present. | |
1e7d6a45 | 234 | */ |
d0882897 CM |
235 | bool cannot_disable_irq; |
236 | ||
237 | /* | |
238 | * Some systems are broken and cannot set the irq enable | |
239 | * bit, even if they support interrupts. | |
240 | */ | |
241 | bool irq_enable_broken; | |
1e7d6a45 | 242 | |
a8df150c CM |
243 | /* |
244 | * Did we get an attention that we did not handle? | |
245 | */ | |
246 | bool got_attn; | |
247 | ||
50c812b2 | 248 | /* From the get device id response... */ |
3ae0e0f9 | 249 | struct ipmi_device_id device_id; |
1da177e4 | 250 | |
910840f2 | 251 | /* Default driver model device. */ |
50c812b2 CM |
252 | struct platform_device *pdev; |
253 | ||
1da177e4 | 254 | /* Counters and things for the proc filesystem. */ |
64959e2d | 255 | atomic_t stats[SI_NUM_STATS]; |
a9a2c44f | 256 | |
c305e3d3 | 257 | struct task_struct *thread; |
b0defcdb CM |
258 | |
259 | struct list_head link; | |
1da177e4 LT |
260 | }; |
261 | ||
64959e2d CM |
262 | #define smi_inc_stat(smi, stat) \ |
263 | atomic_inc(&(smi)->stats[SI_STAT_ ## stat]) | |
264 | #define smi_get_stat(smi, stat) \ | |
265 | ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat])) | |
266 | ||
7a453308 CM |
267 | #define IPMI_MAX_INTFS 4 |
268 | static int force_kipmid[IPMI_MAX_INTFS]; | |
a51f4a81 CM |
269 | static int num_force_kipmid; |
270 | ||
7a453308 | 271 | static unsigned int kipmid_max_busy_us[IPMI_MAX_INTFS]; |
ae74e823 MW |
272 | static int num_max_busy_us; |
273 | ||
7aefac26 | 274 | static bool unload_when_empty = true; |
b361e27b | 275 | |
b0defcdb | 276 | static int try_smi_init(struct smi_info *smi); |
b361e27b | 277 | static void cleanup_one_si(struct smi_info *to_clean); |
d2478521 | 278 | static void cleanup_ipmi_si(void); |
b0defcdb | 279 | |
f93aae9f JS |
280 | #ifdef DEBUG_TIMING |
281 | void debug_timestamp(char *msg) | |
282 | { | |
48862ea2 | 283 | struct timespec64 t; |
f93aae9f | 284 | |
48862ea2 JS |
285 | getnstimeofday64(&t); |
286 | pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) t.tv_sec, t.tv_nsec); | |
f93aae9f JS |
287 | } |
288 | #else | |
289 | #define debug_timestamp(x) | |
290 | #endif | |
291 | ||
e041c683 | 292 | static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list); |
c305e3d3 | 293 | static int register_xaction_notifier(struct notifier_block *nb) |
ea94027b | 294 | { |
e041c683 | 295 | return atomic_notifier_chain_register(&xaction_notifier_list, nb); |
ea94027b CM |
296 | } |
297 | ||
1da177e4 LT |
298 | static void deliver_recv_msg(struct smi_info *smi_info, |
299 | struct ipmi_smi_msg *msg) | |
300 | { | |
7adf579c | 301 | /* Deliver the message to the upper layer. */ |
968bf7cc CM |
302 | if (smi_info->intf) |
303 | ipmi_smi_msg_received(smi_info->intf, msg); | |
304 | else | |
305 | ipmi_free_smi_msg(msg); | |
1da177e4 LT |
306 | } |
307 | ||
4d7cbac7 | 308 | static void return_hosed_msg(struct smi_info *smi_info, int cCode) |
1da177e4 LT |
309 | { |
310 | struct ipmi_smi_msg *msg = smi_info->curr_msg; | |
311 | ||
4d7cbac7 CM |
312 | if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED) |
313 | cCode = IPMI_ERR_UNSPECIFIED; | |
314 | /* else use it as is */ | |
315 | ||
25985edc | 316 | /* Make it a response */ |
1da177e4 LT |
317 | msg->rsp[0] = msg->data[0] | 4; |
318 | msg->rsp[1] = msg->data[1]; | |
4d7cbac7 | 319 | msg->rsp[2] = cCode; |
1da177e4 LT |
320 | msg->rsp_size = 3; |
321 | ||
322 | smi_info->curr_msg = NULL; | |
323 | deliver_recv_msg(smi_info, msg); | |
324 | } | |
325 | ||
326 | static enum si_sm_result start_next_msg(struct smi_info *smi_info) | |
327 | { | |
328 | int rv; | |
1da177e4 | 329 | |
b874b985 | 330 | if (!smi_info->waiting_msg) { |
1da177e4 LT |
331 | smi_info->curr_msg = NULL; |
332 | rv = SI_SM_IDLE; | |
333 | } else { | |
334 | int err; | |
335 | ||
b874b985 CM |
336 | smi_info->curr_msg = smi_info->waiting_msg; |
337 | smi_info->waiting_msg = NULL; | |
f93aae9f | 338 | debug_timestamp("Start2"); |
e041c683 AS |
339 | err = atomic_notifier_call_chain(&xaction_notifier_list, |
340 | 0, smi_info); | |
ea94027b CM |
341 | if (err & NOTIFY_STOP_MASK) { |
342 | rv = SI_SM_CALL_WITHOUT_DELAY; | |
343 | goto out; | |
344 | } | |
1da177e4 LT |
345 | err = smi_info->handlers->start_transaction( |
346 | smi_info->si_sm, | |
347 | smi_info->curr_msg->data, | |
348 | smi_info->curr_msg->data_size); | |
c305e3d3 | 349 | if (err) |
4d7cbac7 | 350 | return_hosed_msg(smi_info, err); |
1da177e4 LT |
351 | |
352 | rv = SI_SM_CALL_WITHOUT_DELAY; | |
353 | } | |
76824852 | 354 | out: |
1da177e4 LT |
355 | return rv; |
356 | } | |
357 | ||
0cfec916 CM |
358 | static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val) |
359 | { | |
360 | smi_info->last_timeout_jiffies = jiffies; | |
361 | mod_timer(&smi_info->si_timer, new_val); | |
362 | smi_info->timer_running = true; | |
363 | } | |
364 | ||
365 | /* | |
366 | * Start a new message and (re)start the timer and thread. | |
367 | */ | |
368 | static void start_new_msg(struct smi_info *smi_info, unsigned char *msg, | |
369 | unsigned int size) | |
370 | { | |
371 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
372 | ||
373 | if (smi_info->thread) | |
374 | wake_up_process(smi_info->thread); | |
375 | ||
376 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, size); | |
377 | } | |
378 | ||
379 | static void start_check_enables(struct smi_info *smi_info, bool start_timer) | |
ee6cd5f8 CM |
380 | { |
381 | unsigned char msg[2]; | |
382 | ||
383 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
384 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
385 | ||
0cfec916 CM |
386 | if (start_timer) |
387 | start_new_msg(smi_info, msg, 2); | |
388 | else | |
389 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
d9b7e4f7 | 390 | smi_info->si_state = SI_CHECKING_ENABLES; |
ee6cd5f8 CM |
391 | } |
392 | ||
0cfec916 | 393 | static void start_clear_flags(struct smi_info *smi_info, bool start_timer) |
1da177e4 LT |
394 | { |
395 | unsigned char msg[3]; | |
396 | ||
397 | /* Make sure the watchdog pre-timeout flag is not set at startup. */ | |
398 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
399 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
400 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
401 | ||
0cfec916 CM |
402 | if (start_timer) |
403 | start_new_msg(smi_info, msg, 3); | |
404 | else | |
405 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); | |
1da177e4 LT |
406 | smi_info->si_state = SI_CLEARING_FLAGS; |
407 | } | |
408 | ||
968bf7cc CM |
409 | static void start_getting_msg_queue(struct smi_info *smi_info) |
410 | { | |
411 | smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
412 | smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD; | |
413 | smi_info->curr_msg->data_size = 2; | |
414 | ||
0cfec916 CM |
415 | start_new_msg(smi_info, smi_info->curr_msg->data, |
416 | smi_info->curr_msg->data_size); | |
968bf7cc CM |
417 | smi_info->si_state = SI_GETTING_MESSAGES; |
418 | } | |
419 | ||
420 | static void start_getting_events(struct smi_info *smi_info) | |
421 | { | |
422 | smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
423 | smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; | |
424 | smi_info->curr_msg->data_size = 2; | |
425 | ||
0cfec916 CM |
426 | start_new_msg(smi_info, smi_info->curr_msg->data, |
427 | smi_info->curr_msg->data_size); | |
968bf7cc CM |
428 | smi_info->si_state = SI_GETTING_EVENTS; |
429 | } | |
430 | ||
c305e3d3 CM |
431 | /* |
432 | * When we have a situtaion where we run out of memory and cannot | |
433 | * allocate messages, we just leave them in the BMC and run the system | |
434 | * polled until we can allocate some memory. Once we have some | |
435 | * memory, we will re-enable the interrupt. | |
1e7d6a45 CM |
436 | * |
437 | * Note that we cannot just use disable_irq(), since the interrupt may | |
438 | * be shared. | |
c305e3d3 | 439 | */ |
0cfec916 | 440 | static inline bool disable_si_irq(struct smi_info *smi_info, bool start_timer) |
1da177e4 | 441 | { |
910840f2 | 442 | if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
7aefac26 | 443 | smi_info->interrupt_disabled = true; |
0cfec916 | 444 | start_check_enables(smi_info, start_timer); |
968bf7cc | 445 | return true; |
1da177e4 | 446 | } |
968bf7cc | 447 | return false; |
1da177e4 LT |
448 | } |
449 | ||
968bf7cc | 450 | static inline bool enable_si_irq(struct smi_info *smi_info) |
1da177e4 | 451 | { |
910840f2 | 452 | if ((smi_info->io.irq) && (smi_info->interrupt_disabled)) { |
7aefac26 | 453 | smi_info->interrupt_disabled = false; |
0cfec916 | 454 | start_check_enables(smi_info, true); |
968bf7cc CM |
455 | return true; |
456 | } | |
457 | return false; | |
458 | } | |
459 | ||
460 | /* | |
461 | * Allocate a message. If unable to allocate, start the interrupt | |
462 | * disable process and return NULL. If able to allocate but | |
463 | * interrupts are disabled, free the message and return NULL after | |
464 | * starting the interrupt enable process. | |
465 | */ | |
466 | static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info) | |
467 | { | |
468 | struct ipmi_smi_msg *msg; | |
469 | ||
470 | msg = ipmi_alloc_smi_msg(); | |
471 | if (!msg) { | |
0cfec916 | 472 | if (!disable_si_irq(smi_info, true)) |
968bf7cc CM |
473 | smi_info->si_state = SI_NORMAL; |
474 | } else if (enable_si_irq(smi_info)) { | |
475 | ipmi_free_smi_msg(msg); | |
476 | msg = NULL; | |
1da177e4 | 477 | } |
968bf7cc | 478 | return msg; |
1da177e4 LT |
479 | } |
480 | ||
481 | static void handle_flags(struct smi_info *smi_info) | |
482 | { | |
76824852 | 483 | retry: |
1da177e4 LT |
484 | if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) { |
485 | /* Watchdog pre-timeout */ | |
64959e2d | 486 | smi_inc_stat(smi_info, watchdog_pretimeouts); |
1da177e4 | 487 | |
0cfec916 | 488 | start_clear_flags(smi_info, true); |
1da177e4 | 489 | smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; |
968bf7cc CM |
490 | if (smi_info->intf) |
491 | ipmi_smi_watchdog_pretimeout(smi_info->intf); | |
1da177e4 LT |
492 | } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) { |
493 | /* Messages available. */ | |
968bf7cc CM |
494 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
495 | if (!smi_info->curr_msg) | |
1da177e4 | 496 | return; |
1da177e4 | 497 | |
968bf7cc | 498 | start_getting_msg_queue(smi_info); |
1da177e4 LT |
499 | } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) { |
500 | /* Events available. */ | |
968bf7cc CM |
501 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
502 | if (!smi_info->curr_msg) | |
1da177e4 | 503 | return; |
1da177e4 | 504 | |
968bf7cc | 505 | start_getting_events(smi_info); |
4064d5ef | 506 | } else if (smi_info->msg_flags & OEM_DATA_AVAIL && |
c305e3d3 | 507 | smi_info->oem_data_avail_handler) { |
4064d5ef CM |
508 | if (smi_info->oem_data_avail_handler(smi_info)) |
509 | goto retry; | |
c305e3d3 | 510 | } else |
1da177e4 | 511 | smi_info->si_state = SI_NORMAL; |
1da177e4 LT |
512 | } |
513 | ||
d9b7e4f7 CM |
514 | /* |
515 | * Global enables we care about. | |
516 | */ | |
517 | #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ | |
518 | IPMI_BMC_EVT_MSG_INTR) | |
519 | ||
95c97b59 CM |
520 | static u8 current_global_enables(struct smi_info *smi_info, u8 base, |
521 | bool *irq_on) | |
d9b7e4f7 CM |
522 | { |
523 | u8 enables = 0; | |
524 | ||
525 | if (smi_info->supports_event_msg_buff) | |
526 | enables |= IPMI_BMC_EVT_MSG_BUFF; | |
d9b7e4f7 | 527 | |
910840f2 | 528 | if (((smi_info->io.irq && !smi_info->interrupt_disabled) || |
d0882897 CM |
529 | smi_info->cannot_disable_irq) && |
530 | !smi_info->irq_enable_broken) | |
d9b7e4f7 | 531 | enables |= IPMI_BMC_RCV_MSG_INTR; |
d9b7e4f7 CM |
532 | |
533 | if (smi_info->supports_event_msg_buff && | |
910840f2 | 534 | smi_info->io.irq && !smi_info->interrupt_disabled && |
d0882897 | 535 | !smi_info->irq_enable_broken) |
d9b7e4f7 | 536 | enables |= IPMI_BMC_EVT_MSG_INTR; |
d9b7e4f7 | 537 | |
95c97b59 CM |
538 | *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR); |
539 | ||
d9b7e4f7 CM |
540 | return enables; |
541 | } | |
542 | ||
95c97b59 CM |
543 | static void check_bt_irq(struct smi_info *smi_info, bool irq_on) |
544 | { | |
545 | u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG); | |
546 | ||
547 | irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT; | |
548 | ||
549 | if ((bool)irqstate == irq_on) | |
550 | return; | |
551 | ||
552 | if (irq_on) | |
553 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, | |
554 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
555 | else | |
556 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0); | |
557 | } | |
558 | ||
1da177e4 LT |
559 | static void handle_transaction_done(struct smi_info *smi_info) |
560 | { | |
561 | struct ipmi_smi_msg *msg; | |
1da177e4 | 562 | |
f93aae9f | 563 | debug_timestamp("Done"); |
1da177e4 LT |
564 | switch (smi_info->si_state) { |
565 | case SI_NORMAL: | |
b0defcdb | 566 | if (!smi_info->curr_msg) |
1da177e4 LT |
567 | break; |
568 | ||
569 | smi_info->curr_msg->rsp_size | |
570 | = smi_info->handlers->get_result( | |
571 | smi_info->si_sm, | |
572 | smi_info->curr_msg->rsp, | |
573 | IPMI_MAX_MSG_LENGTH); | |
574 | ||
c305e3d3 CM |
575 | /* |
576 | * Do this here becase deliver_recv_msg() releases the | |
577 | * lock, and a new message can be put in during the | |
578 | * time the lock is released. | |
579 | */ | |
1da177e4 LT |
580 | msg = smi_info->curr_msg; |
581 | smi_info->curr_msg = NULL; | |
582 | deliver_recv_msg(smi_info, msg); | |
583 | break; | |
584 | ||
585 | case SI_GETTING_FLAGS: | |
586 | { | |
587 | unsigned char msg[4]; | |
588 | unsigned int len; | |
589 | ||
590 | /* We got the flags from the SMI, now handle them. */ | |
591 | len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4); | |
592 | if (msg[2] != 0) { | |
c305e3d3 | 593 | /* Error fetching flags, just give up for now. */ |
1da177e4 LT |
594 | smi_info->si_state = SI_NORMAL; |
595 | } else if (len < 4) { | |
c305e3d3 CM |
596 | /* |
597 | * Hmm, no flags. That's technically illegal, but | |
598 | * don't use uninitialized data. | |
599 | */ | |
1da177e4 LT |
600 | smi_info->si_state = SI_NORMAL; |
601 | } else { | |
602 | smi_info->msg_flags = msg[3]; | |
603 | handle_flags(smi_info); | |
604 | } | |
605 | break; | |
606 | } | |
607 | ||
608 | case SI_CLEARING_FLAGS: | |
1da177e4 LT |
609 | { |
610 | unsigned char msg[3]; | |
611 | ||
612 | /* We cleared the flags. */ | |
613 | smi_info->handlers->get_result(smi_info->si_sm, msg, 3); | |
614 | if (msg[2] != 0) { | |
615 | /* Error clearing flags */ | |
910840f2 | 616 | dev_warn(smi_info->io.dev, |
279fbd0c | 617 | "Error clearing flags: %2.2x\n", msg[2]); |
1da177e4 | 618 | } |
d9b7e4f7 | 619 | smi_info->si_state = SI_NORMAL; |
1da177e4 LT |
620 | break; |
621 | } | |
622 | ||
623 | case SI_GETTING_EVENTS: | |
624 | { | |
625 | smi_info->curr_msg->rsp_size | |
626 | = smi_info->handlers->get_result( | |
627 | smi_info->si_sm, | |
628 | smi_info->curr_msg->rsp, | |
629 | IPMI_MAX_MSG_LENGTH); | |
630 | ||
c305e3d3 CM |
631 | /* |
632 | * Do this here becase deliver_recv_msg() releases the | |
633 | * lock, and a new message can be put in during the | |
634 | * time the lock is released. | |
635 | */ | |
1da177e4 LT |
636 | msg = smi_info->curr_msg; |
637 | smi_info->curr_msg = NULL; | |
638 | if (msg->rsp[2] != 0) { | |
639 | /* Error getting event, probably done. */ | |
640 | msg->done(msg); | |
641 | ||
642 | /* Take off the event flag. */ | |
643 | smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
644 | handle_flags(smi_info); | |
645 | } else { | |
64959e2d | 646 | smi_inc_stat(smi_info, events); |
1da177e4 | 647 | |
c305e3d3 CM |
648 | /* |
649 | * Do this before we deliver the message | |
650 | * because delivering the message releases the | |
651 | * lock and something else can mess with the | |
652 | * state. | |
653 | */ | |
1da177e4 LT |
654 | handle_flags(smi_info); |
655 | ||
656 | deliver_recv_msg(smi_info, msg); | |
657 | } | |
658 | break; | |
659 | } | |
660 | ||
661 | case SI_GETTING_MESSAGES: | |
662 | { | |
663 | smi_info->curr_msg->rsp_size | |
664 | = smi_info->handlers->get_result( | |
665 | smi_info->si_sm, | |
666 | smi_info->curr_msg->rsp, | |
667 | IPMI_MAX_MSG_LENGTH); | |
668 | ||
c305e3d3 CM |
669 | /* |
670 | * Do this here becase deliver_recv_msg() releases the | |
671 | * lock, and a new message can be put in during the | |
672 | * time the lock is released. | |
673 | */ | |
1da177e4 LT |
674 | msg = smi_info->curr_msg; |
675 | smi_info->curr_msg = NULL; | |
676 | if (msg->rsp[2] != 0) { | |
677 | /* Error getting event, probably done. */ | |
678 | msg->done(msg); | |
679 | ||
680 | /* Take off the msg flag. */ | |
681 | smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
682 | handle_flags(smi_info); | |
683 | } else { | |
64959e2d | 684 | smi_inc_stat(smi_info, incoming_messages); |
1da177e4 | 685 | |
c305e3d3 CM |
686 | /* |
687 | * Do this before we deliver the message | |
688 | * because delivering the message releases the | |
689 | * lock and something else can mess with the | |
690 | * state. | |
691 | */ | |
1da177e4 LT |
692 | handle_flags(smi_info); |
693 | ||
694 | deliver_recv_msg(smi_info, msg); | |
695 | } | |
696 | break; | |
697 | } | |
698 | ||
d9b7e4f7 | 699 | case SI_CHECKING_ENABLES: |
1da177e4 LT |
700 | { |
701 | unsigned char msg[4]; | |
d9b7e4f7 | 702 | u8 enables; |
95c97b59 | 703 | bool irq_on; |
1da177e4 LT |
704 | |
705 | /* We got the flags from the SMI, now handle them. */ | |
706 | smi_info->handlers->get_result(smi_info->si_sm, msg, 4); | |
707 | if (msg[2] != 0) { | |
910840f2 | 708 | dev_warn(smi_info->io.dev, |
0849bfec | 709 | "Couldn't get irq info: %x.\n", msg[2]); |
910840f2 | 710 | dev_warn(smi_info->io.dev, |
0849bfec | 711 | "Maybe ok, but ipmi might run very slowly.\n"); |
1da177e4 | 712 | smi_info->si_state = SI_NORMAL; |
d9b7e4f7 CM |
713 | break; |
714 | } | |
95c97b59 | 715 | enables = current_global_enables(smi_info, 0, &irq_on); |
910840f2 | 716 | if (smi_info->io.si_type == SI_BT) |
95c97b59 CM |
717 | /* BT has its own interrupt enable bit. */ |
718 | check_bt_irq(smi_info, irq_on); | |
d9b7e4f7 CM |
719 | if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) { |
720 | /* Enables are not correct, fix them. */ | |
1da177e4 LT |
721 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); |
722 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
d9b7e4f7 | 723 | msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK); |
1da177e4 LT |
724 | smi_info->handlers->start_transaction( |
725 | smi_info->si_sm, msg, 3); | |
d9b7e4f7 CM |
726 | smi_info->si_state = SI_SETTING_ENABLES; |
727 | } else if (smi_info->supports_event_msg_buff) { | |
728 | smi_info->curr_msg = ipmi_alloc_smi_msg(); | |
729 | if (!smi_info->curr_msg) { | |
730 | smi_info->si_state = SI_NORMAL; | |
731 | break; | |
732 | } | |
5ac7b2fc | 733 | start_getting_events(smi_info); |
d9b7e4f7 CM |
734 | } else { |
735 | smi_info->si_state = SI_NORMAL; | |
1da177e4 LT |
736 | } |
737 | break; | |
738 | } | |
739 | ||
d9b7e4f7 | 740 | case SI_SETTING_ENABLES: |
1da177e4 LT |
741 | { |
742 | unsigned char msg[4]; | |
743 | ||
1da177e4 | 744 | smi_info->handlers->get_result(smi_info->si_sm, msg, 4); |
d9b7e4f7 | 745 | if (msg[2] != 0) |
910840f2 | 746 | dev_warn(smi_info->io.dev, |
d9b7e4f7 CM |
747 | "Could not set the global enables: 0x%x.\n", |
748 | msg[2]); | |
749 | ||
750 | if (smi_info->supports_event_msg_buff) { | |
751 | smi_info->curr_msg = ipmi_alloc_smi_msg(); | |
752 | if (!smi_info->curr_msg) { | |
753 | smi_info->si_state = SI_NORMAL; | |
754 | break; | |
755 | } | |
5ac7b2fc | 756 | start_getting_events(smi_info); |
ee6cd5f8 | 757 | } else { |
d9b7e4f7 | 758 | smi_info->si_state = SI_NORMAL; |
ee6cd5f8 | 759 | } |
ee6cd5f8 CM |
760 | break; |
761 | } | |
1da177e4 LT |
762 | } |
763 | } | |
764 | ||
c305e3d3 CM |
765 | /* |
766 | * Called on timeouts and events. Timeouts should pass the elapsed | |
767 | * time, interrupts should pass in zero. Must be called with | |
768 | * si_lock held and interrupts disabled. | |
769 | */ | |
1da177e4 LT |
770 | static enum si_sm_result smi_event_handler(struct smi_info *smi_info, |
771 | int time) | |
772 | { | |
773 | enum si_sm_result si_sm_result; | |
774 | ||
76824852 | 775 | restart: |
c305e3d3 CM |
776 | /* |
777 | * There used to be a loop here that waited a little while | |
778 | * (around 25us) before giving up. That turned out to be | |
779 | * pointless, the minimum delays I was seeing were in the 300us | |
780 | * range, which is far too long to wait in an interrupt. So | |
781 | * we just run until the state machine tells us something | |
782 | * happened or it needs a delay. | |
783 | */ | |
1da177e4 LT |
784 | si_sm_result = smi_info->handlers->event(smi_info->si_sm, time); |
785 | time = 0; | |
786 | while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY) | |
1da177e4 | 787 | si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); |
1da177e4 | 788 | |
c305e3d3 | 789 | if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) { |
64959e2d | 790 | smi_inc_stat(smi_info, complete_transactions); |
1da177e4 LT |
791 | |
792 | handle_transaction_done(smi_info); | |
d9dffd2a | 793 | goto restart; |
c305e3d3 | 794 | } else if (si_sm_result == SI_SM_HOSED) { |
64959e2d | 795 | smi_inc_stat(smi_info, hosed_count); |
1da177e4 | 796 | |
c305e3d3 CM |
797 | /* |
798 | * Do the before return_hosed_msg, because that | |
799 | * releases the lock. | |
800 | */ | |
1da177e4 LT |
801 | smi_info->si_state = SI_NORMAL; |
802 | if (smi_info->curr_msg != NULL) { | |
c305e3d3 CM |
803 | /* |
804 | * If we were handling a user message, format | |
805 | * a response to send to the upper layer to | |
806 | * tell it about the error. | |
807 | */ | |
4d7cbac7 | 808 | return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED); |
1da177e4 | 809 | } |
d9dffd2a | 810 | goto restart; |
1da177e4 LT |
811 | } |
812 | ||
4ea18425 CM |
813 | /* |
814 | * We prefer handling attn over new messages. But don't do | |
815 | * this if there is not yet an upper layer to handle anything. | |
816 | */ | |
a8df150c CM |
817 | if (likely(smi_info->intf) && |
818 | (si_sm_result == SI_SM_ATTN || smi_info->got_attn)) { | |
1da177e4 LT |
819 | unsigned char msg[2]; |
820 | ||
a8df150c CM |
821 | if (smi_info->si_state != SI_NORMAL) { |
822 | /* | |
823 | * We got an ATTN, but we are doing something else. | |
824 | * Handle the ATTN later. | |
825 | */ | |
826 | smi_info->got_attn = true; | |
827 | } else { | |
828 | smi_info->got_attn = false; | |
829 | smi_inc_stat(smi_info, attentions); | |
1da177e4 | 830 | |
a8df150c CM |
831 | /* |
832 | * Got a attn, send down a get message flags to see | |
833 | * what's causing it. It would be better to handle | |
834 | * this in the upper layer, but due to the way | |
835 | * interrupts work with the SMI, that's not really | |
836 | * possible. | |
837 | */ | |
838 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
839 | msg[1] = IPMI_GET_MSG_FLAGS_CMD; | |
1da177e4 | 840 | |
0cfec916 | 841 | start_new_msg(smi_info, msg, 2); |
a8df150c CM |
842 | smi_info->si_state = SI_GETTING_FLAGS; |
843 | goto restart; | |
844 | } | |
1da177e4 LT |
845 | } |
846 | ||
847 | /* If we are currently idle, try to start the next message. */ | |
848 | if (si_sm_result == SI_SM_IDLE) { | |
64959e2d | 849 | smi_inc_stat(smi_info, idles); |
1da177e4 LT |
850 | |
851 | si_sm_result = start_next_msg(smi_info); | |
852 | if (si_sm_result != SI_SM_IDLE) | |
853 | goto restart; | |
c305e3d3 | 854 | } |
1da177e4 LT |
855 | |
856 | if ((si_sm_result == SI_SM_IDLE) | |
c305e3d3 CM |
857 | && (atomic_read(&smi_info->req_events))) { |
858 | /* | |
859 | * We are idle and the upper layer requested that I fetch | |
860 | * events, so do so. | |
861 | */ | |
55162fb1 | 862 | atomic_set(&smi_info->req_events, 0); |
1da177e4 | 863 | |
d9b7e4f7 CM |
864 | /* |
865 | * Take this opportunity to check the interrupt and | |
866 | * message enable state for the BMC. The BMC can be | |
867 | * asynchronously reset, and may thus get interrupts | |
868 | * disable and messages disabled. | |
869 | */ | |
910840f2 | 870 | if (smi_info->supports_event_msg_buff || smi_info->io.irq) { |
0cfec916 | 871 | start_check_enables(smi_info, true); |
d9b7e4f7 CM |
872 | } else { |
873 | smi_info->curr_msg = alloc_msg_handle_irq(smi_info); | |
874 | if (!smi_info->curr_msg) | |
875 | goto out; | |
1da177e4 | 876 | |
d9b7e4f7 CM |
877 | start_getting_events(smi_info); |
878 | } | |
1da177e4 LT |
879 | goto restart; |
880 | } | |
314ef52f CM |
881 | |
882 | if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) { | |
883 | /* Ok it if fails, the timer will just go off. */ | |
884 | if (del_timer(&smi_info->si_timer)) | |
885 | smi_info->timer_running = false; | |
886 | } | |
887 | ||
76824852 | 888 | out: |
1da177e4 LT |
889 | return si_sm_result; |
890 | } | |
891 | ||
89986496 CM |
892 | static void check_start_timer_thread(struct smi_info *smi_info) |
893 | { | |
894 | if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) { | |
895 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
896 | ||
897 | if (smi_info->thread) | |
898 | wake_up_process(smi_info->thread); | |
899 | ||
900 | start_next_msg(smi_info); | |
901 | smi_event_handler(smi_info, 0); | |
902 | } | |
903 | } | |
904 | ||
82802f96 | 905 | static void flush_messages(void *send_info) |
e45361d7 | 906 | { |
82802f96 | 907 | struct smi_info *smi_info = send_info; |
e45361d7 HK |
908 | enum si_sm_result result; |
909 | ||
910 | /* | |
911 | * Currently, this function is called only in run-to-completion | |
912 | * mode. This means we are single-threaded, no need for locks. | |
913 | */ | |
914 | result = smi_event_handler(smi_info, 0); | |
915 | while (result != SI_SM_IDLE) { | |
916 | udelay(SI_SHORT_TIMEOUT_USEC); | |
917 | result = smi_event_handler(smi_info, SI_SHORT_TIMEOUT_USEC); | |
918 | } | |
919 | } | |
920 | ||
1da177e4 | 921 | static void sender(void *send_info, |
99ab32f3 | 922 | struct ipmi_smi_msg *msg) |
1da177e4 LT |
923 | { |
924 | struct smi_info *smi_info = send_info; | |
1da177e4 | 925 | unsigned long flags; |
1da177e4 | 926 | |
f93aae9f | 927 | debug_timestamp("Enqueue"); |
1da177e4 LT |
928 | |
929 | if (smi_info->run_to_completion) { | |
bda4c30a | 930 | /* |
82802f96 HK |
931 | * If we are running to completion, start it. Upper |
932 | * layer will call flush_messages to clear it out. | |
bda4c30a | 933 | */ |
9f812704 | 934 | smi_info->waiting_msg = msg; |
1da177e4 | 935 | return; |
1da177e4 | 936 | } |
1da177e4 | 937 | |
f60adf42 | 938 | spin_lock_irqsave(&smi_info->si_lock, flags); |
1d86e29b CM |
939 | /* |
940 | * The following two lines don't need to be under the lock for | |
941 | * the lock's sake, but they do need SMP memory barriers to | |
942 | * avoid getting things out of order. We are already claiming | |
943 | * the lock, anyway, so just do it under the lock to avoid the | |
944 | * ordering problem. | |
945 | */ | |
946 | BUG_ON(smi_info->waiting_msg); | |
947 | smi_info->waiting_msg = msg; | |
89986496 | 948 | check_start_timer_thread(smi_info); |
bda4c30a | 949 | spin_unlock_irqrestore(&smi_info->si_lock, flags); |
1da177e4 LT |
950 | } |
951 | ||
7aefac26 | 952 | static void set_run_to_completion(void *send_info, bool i_run_to_completion) |
1da177e4 LT |
953 | { |
954 | struct smi_info *smi_info = send_info; | |
1da177e4 LT |
955 | |
956 | smi_info->run_to_completion = i_run_to_completion; | |
e45361d7 HK |
957 | if (i_run_to_completion) |
958 | flush_messages(smi_info); | |
1da177e4 LT |
959 | } |
960 | ||
ae74e823 MW |
961 | /* |
962 | * Use -1 in the nsec value of the busy waiting timespec to tell that | |
963 | * we are spinning in kipmid looking for something and not delaying | |
964 | * between checks | |
965 | */ | |
48862ea2 | 966 | static inline void ipmi_si_set_not_busy(struct timespec64 *ts) |
ae74e823 MW |
967 | { |
968 | ts->tv_nsec = -1; | |
969 | } | |
48862ea2 | 970 | static inline int ipmi_si_is_busy(struct timespec64 *ts) |
ae74e823 MW |
971 | { |
972 | return ts->tv_nsec != -1; | |
973 | } | |
974 | ||
cc4cbe90 AB |
975 | static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result, |
976 | const struct smi_info *smi_info, | |
48862ea2 | 977 | struct timespec64 *busy_until) |
ae74e823 MW |
978 | { |
979 | unsigned int max_busy_us = 0; | |
980 | ||
981 | if (smi_info->intf_num < num_max_busy_us) | |
982 | max_busy_us = kipmid_max_busy_us[smi_info->intf_num]; | |
983 | if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY) | |
984 | ipmi_si_set_not_busy(busy_until); | |
985 | else if (!ipmi_si_is_busy(busy_until)) { | |
48862ea2 JS |
986 | getnstimeofday64(busy_until); |
987 | timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC); | |
ae74e823 | 988 | } else { |
48862ea2 JS |
989 | struct timespec64 now; |
990 | ||
991 | getnstimeofday64(&now); | |
992 | if (unlikely(timespec64_compare(&now, busy_until) > 0)) { | |
ae74e823 MW |
993 | ipmi_si_set_not_busy(busy_until); |
994 | return 0; | |
995 | } | |
996 | } | |
997 | return 1; | |
998 | } | |
999 | ||
1000 | ||
1001 | /* | |
1002 | * A busy-waiting loop for speeding up IPMI operation. | |
1003 | * | |
1004 | * Lousy hardware makes this hard. This is only enabled for systems | |
1005 | * that are not BT and do not have interrupts. It starts spinning | |
1006 | * when an operation is complete or until max_busy tells it to stop | |
1007 | * (if that is enabled). See the paragraph on kimid_max_busy_us in | |
1008 | * Documentation/IPMI.txt for details. | |
1009 | */ | |
a9a2c44f CM |
1010 | static int ipmi_thread(void *data) |
1011 | { | |
1012 | struct smi_info *smi_info = data; | |
e9a705a0 | 1013 | unsigned long flags; |
a9a2c44f | 1014 | enum si_sm_result smi_result; |
48862ea2 | 1015 | struct timespec64 busy_until; |
a9a2c44f | 1016 | |
ae74e823 | 1017 | ipmi_si_set_not_busy(&busy_until); |
8698a745 | 1018 | set_user_nice(current, MAX_NICE); |
e9a705a0 | 1019 | while (!kthread_should_stop()) { |
ae74e823 MW |
1020 | int busy_wait; |
1021 | ||
a9a2c44f | 1022 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
8a3628d5 | 1023 | smi_result = smi_event_handler(smi_info, 0); |
48e8ac29 BS |
1024 | |
1025 | /* | |
1026 | * If the driver is doing something, there is a possible | |
1027 | * race with the timer. If the timer handler see idle, | |
1028 | * and the thread here sees something else, the timer | |
1029 | * handler won't restart the timer even though it is | |
1030 | * required. So start it here if necessary. | |
1031 | */ | |
1032 | if (smi_result != SI_SM_IDLE && !smi_info->timer_running) | |
1033 | smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); | |
1034 | ||
a9a2c44f | 1035 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
ae74e823 MW |
1036 | busy_wait = ipmi_thread_busy_wait(smi_result, smi_info, |
1037 | &busy_until); | |
c305e3d3 CM |
1038 | if (smi_result == SI_SM_CALL_WITHOUT_DELAY) |
1039 | ; /* do nothing */ | |
ae74e823 | 1040 | else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait) |
33979734 | 1041 | schedule(); |
89986496 CM |
1042 | else if (smi_result == SI_SM_IDLE) { |
1043 | if (atomic_read(&smi_info->need_watch)) { | |
1044 | schedule_timeout_interruptible(100); | |
1045 | } else { | |
1046 | /* Wait to be woken up when we are needed. */ | |
1047 | __set_current_state(TASK_INTERRUPTIBLE); | |
1048 | schedule(); | |
1049 | } | |
1050 | } else | |
8d1f66dc | 1051 | schedule_timeout_interruptible(1); |
a9a2c44f | 1052 | } |
a9a2c44f CM |
1053 | return 0; |
1054 | } | |
1055 | ||
1056 | ||
1da177e4 LT |
1057 | static void poll(void *send_info) |
1058 | { | |
1059 | struct smi_info *smi_info = send_info; | |
f60adf42 | 1060 | unsigned long flags = 0; |
7aefac26 | 1061 | bool run_to_completion = smi_info->run_to_completion; |
1da177e4 | 1062 | |
15c62e10 CM |
1063 | /* |
1064 | * Make sure there is some delay in the poll loop so we can | |
1065 | * drive time forward and timeout things. | |
1066 | */ | |
1067 | udelay(10); | |
f60adf42 CM |
1068 | if (!run_to_completion) |
1069 | spin_lock_irqsave(&smi_info->si_lock, flags); | |
15c62e10 | 1070 | smi_event_handler(smi_info, 10); |
f60adf42 CM |
1071 | if (!run_to_completion) |
1072 | spin_unlock_irqrestore(&smi_info->si_lock, flags); | |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | static void request_events(void *send_info) | |
1076 | { | |
1077 | struct smi_info *smi_info = send_info; | |
1078 | ||
b874b985 | 1079 | if (!smi_info->has_event_buffer) |
b361e27b CM |
1080 | return; |
1081 | ||
1da177e4 LT |
1082 | atomic_set(&smi_info->req_events, 1); |
1083 | } | |
1084 | ||
7aefac26 | 1085 | static void set_need_watch(void *send_info, bool enable) |
89986496 CM |
1086 | { |
1087 | struct smi_info *smi_info = send_info; | |
1088 | unsigned long flags; | |
1089 | ||
1090 | atomic_set(&smi_info->need_watch, enable); | |
1091 | spin_lock_irqsave(&smi_info->si_lock, flags); | |
1092 | check_start_timer_thread(smi_info); | |
1093 | spin_unlock_irqrestore(&smi_info->si_lock, flags); | |
1094 | } | |
1095 | ||
1da177e4 LT |
1096 | static void smi_timeout(unsigned long data) |
1097 | { | |
1098 | struct smi_info *smi_info = (struct smi_info *) data; | |
1099 | enum si_sm_result smi_result; | |
1100 | unsigned long flags; | |
1101 | unsigned long jiffies_now; | |
c4edff1c | 1102 | long time_diff; |
3326f4f2 | 1103 | long timeout; |
1da177e4 | 1104 | |
1da177e4 | 1105 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
f93aae9f JS |
1106 | debug_timestamp("Timer"); |
1107 | ||
1da177e4 | 1108 | jiffies_now = jiffies; |
c4edff1c | 1109 | time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies) |
1da177e4 LT |
1110 | * SI_USEC_PER_JIFFY); |
1111 | smi_result = smi_event_handler(smi_info, time_diff); | |
1112 | ||
910840f2 | 1113 | if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
1da177e4 | 1114 | /* Running with interrupts, only do long timeouts. */ |
3326f4f2 | 1115 | timeout = jiffies + SI_TIMEOUT_JIFFIES; |
64959e2d | 1116 | smi_inc_stat(smi_info, long_timeouts); |
3326f4f2 | 1117 | goto do_mod_timer; |
1da177e4 LT |
1118 | } |
1119 | ||
c305e3d3 CM |
1120 | /* |
1121 | * If the state machine asks for a short delay, then shorten | |
1122 | * the timer timeout. | |
1123 | */ | |
1da177e4 | 1124 | if (smi_result == SI_SM_CALL_WITH_DELAY) { |
64959e2d | 1125 | smi_inc_stat(smi_info, short_timeouts); |
3326f4f2 | 1126 | timeout = jiffies + 1; |
1da177e4 | 1127 | } else { |
64959e2d | 1128 | smi_inc_stat(smi_info, long_timeouts); |
3326f4f2 | 1129 | timeout = jiffies + SI_TIMEOUT_JIFFIES; |
1da177e4 LT |
1130 | } |
1131 | ||
76824852 | 1132 | do_mod_timer: |
3326f4f2 | 1133 | if (smi_result != SI_SM_IDLE) |
48e8ac29 BS |
1134 | smi_mod_timer(smi_info, timeout); |
1135 | else | |
1136 | smi_info->timer_running = false; | |
1137 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); | |
1da177e4 LT |
1138 | } |
1139 | ||
4f3e8199 | 1140 | irqreturn_t ipmi_si_irq_handler(int irq, void *data) |
1da177e4 LT |
1141 | { |
1142 | struct smi_info *smi_info = data; | |
1143 | unsigned long flags; | |
1da177e4 | 1144 | |
4f3e8199 CM |
1145 | if (smi_info->io.si_type == SI_BT) |
1146 | /* We need to clear the IRQ flag for the BT interface. */ | |
1147 | smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, | |
1148 | IPMI_BT_INTMASK_CLEAR_IRQ_BIT | |
1149 | | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
1150 | ||
1da177e4 LT |
1151 | spin_lock_irqsave(&(smi_info->si_lock), flags); |
1152 | ||
64959e2d | 1153 | smi_inc_stat(smi_info, interrupts); |
1da177e4 | 1154 | |
f93aae9f JS |
1155 | debug_timestamp("Interrupt"); |
1156 | ||
1da177e4 | 1157 | smi_event_handler(smi_info, 0); |
1da177e4 LT |
1158 | spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
1159 | return IRQ_HANDLED; | |
1160 | } | |
1161 | ||
453823ba CM |
1162 | static int smi_start_processing(void *send_info, |
1163 | ipmi_smi_t intf) | |
1164 | { | |
1165 | struct smi_info *new_smi = send_info; | |
a51f4a81 | 1166 | int enable = 0; |
453823ba CM |
1167 | |
1168 | new_smi->intf = intf; | |
1169 | ||
1170 | /* Set up the timer that drives the interface. */ | |
1171 | setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi); | |
48e8ac29 | 1172 | smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES); |
453823ba | 1173 | |
27f972d3 | 1174 | /* Try to claim any interrupts. */ |
4f3e8199 CM |
1175 | if (new_smi->io.irq_setup) { |
1176 | new_smi->io.irq_handler_data = new_smi; | |
1177 | new_smi->io.irq_setup(&new_smi->io); | |
1178 | } | |
27f972d3 | 1179 | |
a51f4a81 CM |
1180 | /* |
1181 | * Check if the user forcefully enabled the daemon. | |
1182 | */ | |
1183 | if (new_smi->intf_num < num_force_kipmid) | |
1184 | enable = force_kipmid[new_smi->intf_num]; | |
df3fe8de CM |
1185 | /* |
1186 | * The BT interface is efficient enough to not need a thread, | |
1187 | * and there is no need for a thread if we have interrupts. | |
1188 | */ | |
910840f2 | 1189 | else if ((new_smi->io.si_type != SI_BT) && (!new_smi->io.irq)) |
a51f4a81 CM |
1190 | enable = 1; |
1191 | ||
1192 | if (enable) { | |
453823ba CM |
1193 | new_smi->thread = kthread_run(ipmi_thread, new_smi, |
1194 | "kipmi%d", new_smi->intf_num); | |
1195 | if (IS_ERR(new_smi->thread)) { | |
910840f2 | 1196 | dev_notice(new_smi->io.dev, "Could not start" |
279fbd0c MS |
1197 | " kernel thread due to error %ld, only using" |
1198 | " timers to drive the interface\n", | |
1199 | PTR_ERR(new_smi->thread)); | |
453823ba CM |
1200 | new_smi->thread = NULL; |
1201 | } | |
1202 | } | |
1203 | ||
1204 | return 0; | |
1205 | } | |
9dbf68f9 | 1206 | |
16f4232c ZY |
1207 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) |
1208 | { | |
1209 | struct smi_info *smi = send_info; | |
1210 | ||
910840f2 CM |
1211 | data->addr_src = smi->io.addr_source; |
1212 | data->dev = smi->io.dev; | |
bb398a4c | 1213 | data->addr_info = smi->io.addr_info; |
910840f2 | 1214 | get_device(smi->io.dev); |
16f4232c ZY |
1215 | |
1216 | return 0; | |
1217 | } | |
1218 | ||
7aefac26 | 1219 | static void set_maintenance_mode(void *send_info, bool enable) |
b9675136 CM |
1220 | { |
1221 | struct smi_info *smi_info = send_info; | |
1222 | ||
1223 | if (!enable) | |
1224 | atomic_set(&smi_info->req_events, 0); | |
1225 | } | |
1226 | ||
81d02b7f | 1227 | static const struct ipmi_smi_handlers handlers = { |
1da177e4 | 1228 | .owner = THIS_MODULE, |
453823ba | 1229 | .start_processing = smi_start_processing, |
16f4232c | 1230 | .get_smi_info = get_smi_info, |
1da177e4 LT |
1231 | .sender = sender, |
1232 | .request_events = request_events, | |
89986496 | 1233 | .set_need_watch = set_need_watch, |
b9675136 | 1234 | .set_maintenance_mode = set_maintenance_mode, |
1da177e4 | 1235 | .set_run_to_completion = set_run_to_completion, |
82802f96 | 1236 | .flush_messages = flush_messages, |
1da177e4 LT |
1237 | .poll = poll, |
1238 | }; | |
1239 | ||
b0defcdb | 1240 | static LIST_HEAD(smi_infos); |
d6dfd131 | 1241 | static DEFINE_MUTEX(smi_infos_lock); |
b0defcdb | 1242 | static int smi_num; /* Used to sequence the SMIs */ |
1da177e4 | 1243 | |
99ee6735 | 1244 | static const char * const addr_space_to_str[] = { "i/o", "mem" }; |
b361e27b | 1245 | |
a51f4a81 CM |
1246 | module_param_array(force_kipmid, int, &num_force_kipmid, 0); |
1247 | MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or" | |
1248 | " disabled(0). Normally the IPMI driver auto-detects" | |
1249 | " this, but the value may be overridden by this parm."); | |
7aefac26 | 1250 | module_param(unload_when_empty, bool, 0); |
b361e27b CM |
1251 | MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are" |
1252 | " specified or found, default is 1. Setting to 0" | |
1253 | " is useful for hot add of devices using hotmod."); | |
ae74e823 MW |
1254 | module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644); |
1255 | MODULE_PARM_DESC(kipmid_max_busy_us, | |
1256 | "Max time (in microseconds) to busy-wait for IPMI data before" | |
1257 | " sleeping. 0 (default) means to wait forever. Set to 100-500" | |
1258 | " if kipmid is using up a lot of CPU time."); | |
1da177e4 | 1259 | |
4f3e8199 CM |
1260 | void ipmi_irq_finish_setup(struct si_sm_io *io) |
1261 | { | |
1262 | if (io->si_type == SI_BT) | |
1263 | /* Enable the interrupt in the BT interface. */ | |
1264 | io->outputb(io, IPMI_BT_INTMASK_REG, | |
1265 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); | |
1266 | } | |
1da177e4 | 1267 | |
4f3e8199 | 1268 | void ipmi_irq_start_cleanup(struct si_sm_io *io) |
1da177e4 | 1269 | { |
4f3e8199 | 1270 | if (io->si_type == SI_BT) |
b0defcdb | 1271 | /* Disable the interrupt in the BT interface. */ |
4f3e8199 CM |
1272 | io->outputb(io, IPMI_BT_INTMASK_REG, 0); |
1273 | } | |
1274 | ||
1275 | static void std_irq_cleanup(struct si_sm_io *io) | |
1276 | { | |
1277 | ipmi_irq_start_cleanup(io); | |
1278 | free_irq(io->irq, io->irq_handler_data); | |
1da177e4 | 1279 | } |
1da177e4 | 1280 | |
4f3e8199 | 1281 | int ipmi_std_irq_setup(struct si_sm_io *io) |
1da177e4 LT |
1282 | { |
1283 | int rv; | |
1284 | ||
4f3e8199 | 1285 | if (!io->irq) |
1da177e4 LT |
1286 | return 0; |
1287 | ||
4f3e8199 CM |
1288 | rv = request_irq(io->irq, |
1289 | ipmi_si_irq_handler, | |
1290 | IRQF_SHARED, | |
1291 | DEVICE_NAME, | |
1292 | io->irq_handler_data); | |
1da177e4 | 1293 | if (rv) { |
4f3e8199 | 1294 | dev_warn(io->dev, "%s unable to claim interrupt %d," |
279fbd0c | 1295 | " running polled\n", |
4f3e8199 CM |
1296 | DEVICE_NAME, io->irq); |
1297 | io->irq = 0; | |
1da177e4 | 1298 | } else { |
4f3e8199 CM |
1299 | io->irq_cleanup = std_irq_cleanup; |
1300 | ipmi_irq_finish_setup(io); | |
1301 | dev_info(io->dev, "Using irq %d\n", io->irq); | |
1da177e4 LT |
1302 | } |
1303 | ||
1304 | return rv; | |
1305 | } | |
1306 | ||
81d02b7f | 1307 | static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset) |
1da177e4 | 1308 | { |
b0defcdb | 1309 | unsigned int addr = io->addr_data; |
1da177e4 | 1310 | |
b0defcdb | 1311 | return inb(addr + (offset * io->regspacing)); |
1da177e4 LT |
1312 | } |
1313 | ||
81d02b7f | 1314 | static void port_outb(const struct si_sm_io *io, unsigned int offset, |
1da177e4 LT |
1315 | unsigned char b) |
1316 | { | |
b0defcdb | 1317 | unsigned int addr = io->addr_data; |
1da177e4 | 1318 | |
b0defcdb | 1319 | outb(b, addr + (offset * io->regspacing)); |
1da177e4 LT |
1320 | } |
1321 | ||
81d02b7f | 1322 | static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset) |
1da177e4 | 1323 | { |
b0defcdb | 1324 | unsigned int addr = io->addr_data; |
1da177e4 | 1325 | |
b0defcdb | 1326 | return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff; |
1da177e4 LT |
1327 | } |
1328 | ||
81d02b7f | 1329 | static void port_outw(const struct si_sm_io *io, unsigned int offset, |
1da177e4 LT |
1330 | unsigned char b) |
1331 | { | |
b0defcdb | 1332 | unsigned int addr = io->addr_data; |
1da177e4 | 1333 | |
b0defcdb | 1334 | outw(b << io->regshift, addr + (offset * io->regspacing)); |
1da177e4 LT |
1335 | } |
1336 | ||
81d02b7f | 1337 | static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset) |
1da177e4 | 1338 | { |
b0defcdb | 1339 | unsigned int addr = io->addr_data; |
1da177e4 | 1340 | |
b0defcdb | 1341 | return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff; |
1da177e4 LT |
1342 | } |
1343 | ||
81d02b7f | 1344 | static void port_outl(const struct si_sm_io *io, unsigned int offset, |
1da177e4 LT |
1345 | unsigned char b) |
1346 | { | |
b0defcdb | 1347 | unsigned int addr = io->addr_data; |
1da177e4 | 1348 | |
b0defcdb | 1349 | outl(b << io->regshift, addr+(offset * io->regspacing)); |
1da177e4 LT |
1350 | } |
1351 | ||
e1eeb7f8 | 1352 | static void port_cleanup(struct si_sm_io *io) |
1da177e4 | 1353 | { |
e1eeb7f8 | 1354 | unsigned int addr = io->addr_data; |
d61a3ead | 1355 | int idx; |
1da177e4 | 1356 | |
b0defcdb | 1357 | if (addr) { |
e1eeb7f8 CM |
1358 | for (idx = 0; idx < io->io_size; idx++) |
1359 | release_region(addr + idx * io->regspacing, | |
1360 | io->regsize); | |
1da177e4 | 1361 | } |
1da177e4 LT |
1362 | } |
1363 | ||
e1eeb7f8 | 1364 | static int port_setup(struct si_sm_io *io) |
1da177e4 | 1365 | { |
e1eeb7f8 | 1366 | unsigned int addr = io->addr_data; |
d61a3ead | 1367 | int idx; |
1da177e4 | 1368 | |
b0defcdb | 1369 | if (!addr) |
1da177e4 LT |
1370 | return -ENODEV; |
1371 | ||
e1eeb7f8 | 1372 | io->io_cleanup = port_cleanup; |
1da177e4 | 1373 | |
c305e3d3 CM |
1374 | /* |
1375 | * Figure out the actual inb/inw/inl/etc routine to use based | |
1376 | * upon the register size. | |
1377 | */ | |
e1eeb7f8 | 1378 | switch (io->regsize) { |
1da177e4 | 1379 | case 1: |
e1eeb7f8 CM |
1380 | io->inputb = port_inb; |
1381 | io->outputb = port_outb; | |
1da177e4 LT |
1382 | break; |
1383 | case 2: | |
e1eeb7f8 CM |
1384 | io->inputb = port_inw; |
1385 | io->outputb = port_outw; | |
1da177e4 LT |
1386 | break; |
1387 | case 4: | |
e1eeb7f8 CM |
1388 | io->inputb = port_inl; |
1389 | io->outputb = port_outl; | |
1da177e4 LT |
1390 | break; |
1391 | default: | |
e1eeb7f8 CM |
1392 | dev_warn(io->dev, "Invalid register size: %d\n", |
1393 | io->regsize); | |
1da177e4 LT |
1394 | return -EINVAL; |
1395 | } | |
1396 | ||
c305e3d3 CM |
1397 | /* |
1398 | * Some BIOSes reserve disjoint I/O regions in their ACPI | |
d61a3ead CM |
1399 | * tables. This causes problems when trying to register the |
1400 | * entire I/O region. Therefore we must register each I/O | |
1401 | * port separately. | |
1402 | */ | |
e1eeb7f8 CM |
1403 | for (idx = 0; idx < io->io_size; idx++) { |
1404 | if (request_region(addr + idx * io->regspacing, | |
1405 | io->regsize, DEVICE_NAME) == NULL) { | |
d61a3ead | 1406 | /* Undo allocations */ |
76824852 | 1407 | while (idx--) |
e1eeb7f8 CM |
1408 | release_region(addr + idx * io->regspacing, |
1409 | io->regsize); | |
d61a3ead CM |
1410 | return -EIO; |
1411 | } | |
1412 | } | |
1da177e4 LT |
1413 | return 0; |
1414 | } | |
1415 | ||
81d02b7f CM |
1416 | static unsigned char intf_mem_inb(const struct si_sm_io *io, |
1417 | unsigned int offset) | |
1da177e4 LT |
1418 | { |
1419 | return readb((io->addr)+(offset * io->regspacing)); | |
1420 | } | |
1421 | ||
81d02b7f CM |
1422 | static void intf_mem_outb(const struct si_sm_io *io, unsigned int offset, |
1423 | unsigned char b) | |
1da177e4 LT |
1424 | { |
1425 | writeb(b, (io->addr)+(offset * io->regspacing)); | |
1426 | } | |
1427 | ||
81d02b7f CM |
1428 | static unsigned char intf_mem_inw(const struct si_sm_io *io, |
1429 | unsigned int offset) | |
1da177e4 LT |
1430 | { |
1431 | return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift) | |
64d9fe69 | 1432 | & 0xff; |
1da177e4 LT |
1433 | } |
1434 | ||
81d02b7f CM |
1435 | static void intf_mem_outw(const struct si_sm_io *io, unsigned int offset, |
1436 | unsigned char b) | |
1da177e4 LT |
1437 | { |
1438 | writeb(b << io->regshift, (io->addr)+(offset * io->regspacing)); | |
1439 | } | |
1440 | ||
81d02b7f CM |
1441 | static unsigned char intf_mem_inl(const struct si_sm_io *io, |
1442 | unsigned int offset) | |
1da177e4 LT |
1443 | { |
1444 | return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift) | |
64d9fe69 | 1445 | & 0xff; |
1da177e4 LT |
1446 | } |
1447 | ||
81d02b7f CM |
1448 | static void intf_mem_outl(const struct si_sm_io *io, unsigned int offset, |
1449 | unsigned char b) | |
1da177e4 LT |
1450 | { |
1451 | writel(b << io->regshift, (io->addr)+(offset * io->regspacing)); | |
1452 | } | |
1453 | ||
1454 | #ifdef readq | |
81d02b7f | 1455 | static unsigned char mem_inq(const struct si_sm_io *io, unsigned int offset) |
1da177e4 LT |
1456 | { |
1457 | return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift) | |
64d9fe69 | 1458 | & 0xff; |
1da177e4 LT |
1459 | } |
1460 | ||
81d02b7f | 1461 | static void mem_outq(const struct si_sm_io *io, unsigned int offset, |
1da177e4 LT |
1462 | unsigned char b) |
1463 | { | |
1464 | writeq(b << io->regshift, (io->addr)+(offset * io->regspacing)); | |
1465 | } | |
1466 | #endif | |
1467 | ||
e1eeb7f8 | 1468 | static void mem_region_cleanup(struct si_sm_io *io, int num) |
1da177e4 | 1469 | { |
e1eeb7f8 | 1470 | unsigned long addr = io->addr_data; |
57a38f13 CM |
1471 | int idx; |
1472 | ||
1473 | for (idx = 0; idx < num; idx++) | |
e1eeb7f8 CM |
1474 | release_mem_region(addr + idx * io->regspacing, |
1475 | io->regsize); | |
57a38f13 | 1476 | } |
1da177e4 | 1477 | |
e1eeb7f8 | 1478 | static void mem_cleanup(struct si_sm_io *io) |
57a38f13 | 1479 | { |
e1eeb7f8 CM |
1480 | if (io->addr) { |
1481 | iounmap(io->addr); | |
1482 | mem_region_cleanup(io, io->io_size); | |
1da177e4 | 1483 | } |
1da177e4 LT |
1484 | } |
1485 | ||
e1eeb7f8 | 1486 | static int mem_setup(struct si_sm_io *io) |
1da177e4 | 1487 | { |
e1eeb7f8 | 1488 | unsigned long addr = io->addr_data; |
57a38f13 | 1489 | int mapsize, idx; |
1da177e4 | 1490 | |
b0defcdb | 1491 | if (!addr) |
1da177e4 LT |
1492 | return -ENODEV; |
1493 | ||
e1eeb7f8 | 1494 | io->io_cleanup = mem_cleanup; |
1da177e4 | 1495 | |
c305e3d3 CM |
1496 | /* |
1497 | * Figure out the actual readb/readw/readl/etc routine to use based | |
1498 | * upon the register size. | |
1499 | */ | |
e1eeb7f8 | 1500 | switch (io->regsize) { |
1da177e4 | 1501 | case 1: |
e1eeb7f8 CM |
1502 | io->inputb = intf_mem_inb; |
1503 | io->outputb = intf_mem_outb; | |
1da177e4 LT |
1504 | break; |
1505 | case 2: | |
e1eeb7f8 CM |
1506 | io->inputb = intf_mem_inw; |
1507 | io->outputb = intf_mem_outw; | |
1da177e4 LT |
1508 | break; |
1509 | case 4: | |
e1eeb7f8 CM |
1510 | io->inputb = intf_mem_inl; |
1511 | io->outputb = intf_mem_outl; | |
1da177e4 LT |
1512 | break; |
1513 | #ifdef readq | |
1514 | case 8: | |
e1eeb7f8 CM |
1515 | io->inputb = mem_inq; |
1516 | io->outputb = mem_outq; | |
1da177e4 LT |
1517 | break; |
1518 | #endif | |
1519 | default: | |
e1eeb7f8 CM |
1520 | dev_warn(io->dev, "Invalid register size: %d\n", |
1521 | io->regsize); | |
1da177e4 LT |
1522 | return -EINVAL; |
1523 | } | |
1524 | ||
57a38f13 CM |
1525 | /* |
1526 | * Some BIOSes reserve disjoint memory regions in their ACPI | |
1527 | * tables. This causes problems when trying to request the | |
1528 | * entire region. Therefore we must request each register | |
1529 | * separately. | |
1530 | */ | |
e1eeb7f8 CM |
1531 | for (idx = 0; idx < io->io_size; idx++) { |
1532 | if (request_mem_region(addr + idx * io->regspacing, | |
1533 | io->regsize, DEVICE_NAME) == NULL) { | |
57a38f13 | 1534 | /* Undo allocations */ |
e1eeb7f8 | 1535 | mem_region_cleanup(io, idx); |
57a38f13 CM |
1536 | return -EIO; |
1537 | } | |
1538 | } | |
1539 | ||
c305e3d3 CM |
1540 | /* |
1541 | * Calculate the total amount of memory to claim. This is an | |
1da177e4 LT |
1542 | * unusual looking calculation, but it avoids claiming any |
1543 | * more memory than it has to. It will claim everything | |
1544 | * between the first address to the end of the last full | |
c305e3d3 CM |
1545 | * register. |
1546 | */ | |
e1eeb7f8 CM |
1547 | mapsize = ((io->io_size * io->regspacing) |
1548 | - (io->regspacing - io->regsize)); | |
1549 | io->addr = ioremap(addr, mapsize); | |
1550 | if (io->addr == NULL) { | |
1551 | mem_region_cleanup(io, io->io_size); | |
1da177e4 LT |
1552 | return -EIO; |
1553 | } | |
1554 | return 0; | |
1555 | } | |
1556 | ||
de5e2ddf ED |
1557 | static struct smi_info *smi_info_alloc(void) |
1558 | { | |
1559 | struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL); | |
1560 | ||
f60adf42 | 1561 | if (info) |
de5e2ddf | 1562 | spin_lock_init(&info->si_lock); |
de5e2ddf ED |
1563 | return info; |
1564 | } | |
1565 | ||
40112ae7 | 1566 | static int wait_for_msg_done(struct smi_info *smi_info) |
1da177e4 | 1567 | { |
50c812b2 | 1568 | enum si_sm_result smi_result; |
1da177e4 LT |
1569 | |
1570 | smi_result = smi_info->handlers->event(smi_info->si_sm, 0); | |
c305e3d3 | 1571 | for (;;) { |
c3e7e791 CM |
1572 | if (smi_result == SI_SM_CALL_WITH_DELAY || |
1573 | smi_result == SI_SM_CALL_WITH_TICK_DELAY) { | |
da4cd8df | 1574 | schedule_timeout_uninterruptible(1); |
1da177e4 | 1575 | smi_result = smi_info->handlers->event( |
e21404dc | 1576 | smi_info->si_sm, jiffies_to_usecs(1)); |
c305e3d3 | 1577 | } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { |
1da177e4 LT |
1578 | smi_result = smi_info->handlers->event( |
1579 | smi_info->si_sm, 0); | |
c305e3d3 | 1580 | } else |
1da177e4 LT |
1581 | break; |
1582 | } | |
40112ae7 | 1583 | if (smi_result == SI_SM_HOSED) |
c305e3d3 CM |
1584 | /* |
1585 | * We couldn't get the state machine to run, so whatever's at | |
1586 | * the port is probably not an IPMI SMI interface. | |
1587 | */ | |
40112ae7 CM |
1588 | return -ENODEV; |
1589 | ||
1590 | return 0; | |
1591 | } | |
1592 | ||
1593 | static int try_get_dev_id(struct smi_info *smi_info) | |
1594 | { | |
1595 | unsigned char msg[2]; | |
1596 | unsigned char *resp; | |
1597 | unsigned long resp_len; | |
1598 | int rv = 0; | |
1599 | ||
1600 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1601 | if (!resp) | |
1602 | return -ENOMEM; | |
1603 | ||
1604 | /* | |
1605 | * Do a Get Device ID command, since it comes back with some | |
1606 | * useful info. | |
1607 | */ | |
1608 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1609 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1610 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1611 | ||
1612 | rv = wait_for_msg_done(smi_info); | |
1613 | if (rv) | |
1da177e4 | 1614 | goto out; |
1da177e4 | 1615 | |
1da177e4 LT |
1616 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
1617 | resp, IPMI_MAX_MSG_LENGTH); | |
1da177e4 | 1618 | |
d8c98618 | 1619 | /* Check and record info from the get device id, in case we need it. */ |
c468f911 JK |
1620 | rv = ipmi_demangle_device_id(resp[0] >> 2, resp[1], |
1621 | resp + 2, resp_len - 2, &smi_info->device_id); | |
1da177e4 | 1622 | |
76824852 | 1623 | out: |
1da177e4 LT |
1624 | kfree(resp); |
1625 | return rv; | |
1626 | } | |
1627 | ||
d0882897 | 1628 | static int get_global_enables(struct smi_info *smi_info, u8 *enables) |
1e7d6a45 CM |
1629 | { |
1630 | unsigned char msg[3]; | |
1631 | unsigned char *resp; | |
1632 | unsigned long resp_len; | |
1633 | int rv; | |
1634 | ||
1635 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
d0882897 CM |
1636 | if (!resp) |
1637 | return -ENOMEM; | |
1e7d6a45 CM |
1638 | |
1639 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1640 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1641 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1642 | ||
1643 | rv = wait_for_msg_done(smi_info); | |
1644 | if (rv) { | |
910840f2 | 1645 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1646 | "Error getting response from get global enables command: %d\n", |
1647 | rv); | |
1e7d6a45 CM |
1648 | goto out; |
1649 | } | |
1650 | ||
1651 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1652 | resp, IPMI_MAX_MSG_LENGTH); | |
1653 | ||
1654 | if (resp_len < 4 || | |
1655 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1656 | resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || | |
1657 | resp[2] != 0) { | |
910840f2 | 1658 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1659 | "Invalid return from get global enables command: %ld %x %x %x\n", |
1660 | resp_len, resp[0], resp[1], resp[2]); | |
1e7d6a45 CM |
1661 | rv = -EINVAL; |
1662 | goto out; | |
d0882897 CM |
1663 | } else { |
1664 | *enables = resp[3]; | |
1e7d6a45 CM |
1665 | } |
1666 | ||
d0882897 CM |
1667 | out: |
1668 | kfree(resp); | |
1669 | return rv; | |
1670 | } | |
1671 | ||
1672 | /* | |
1673 | * Returns 1 if it gets an error from the command. | |
1674 | */ | |
1675 | static int set_global_enables(struct smi_info *smi_info, u8 enables) | |
1676 | { | |
1677 | unsigned char msg[3]; | |
1678 | unsigned char *resp; | |
1679 | unsigned long resp_len; | |
1680 | int rv; | |
1681 | ||
1682 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1683 | if (!resp) | |
1684 | return -ENOMEM; | |
1e7d6a45 CM |
1685 | |
1686 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1687 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
d0882897 | 1688 | msg[2] = enables; |
1e7d6a45 CM |
1689 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); |
1690 | ||
1691 | rv = wait_for_msg_done(smi_info); | |
1692 | if (rv) { | |
910840f2 | 1693 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1694 | "Error getting response from set global enables command: %d\n", |
1695 | rv); | |
1e7d6a45 CM |
1696 | goto out; |
1697 | } | |
1698 | ||
1699 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1700 | resp, IPMI_MAX_MSG_LENGTH); | |
1701 | ||
1702 | if (resp_len < 3 || | |
1703 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1704 | resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { | |
910840f2 | 1705 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1706 | "Invalid return from set global enables command: %ld %x %x\n", |
1707 | resp_len, resp[0], resp[1]); | |
1e7d6a45 CM |
1708 | rv = -EINVAL; |
1709 | goto out; | |
1710 | } | |
1711 | ||
d0882897 CM |
1712 | if (resp[2] != 0) |
1713 | rv = 1; | |
1714 | ||
1715 | out: | |
1716 | kfree(resp); | |
1717 | return rv; | |
1718 | } | |
1719 | ||
1720 | /* | |
1721 | * Some BMCs do not support clearing the receive irq bit in the global | |
1722 | * enables (even if they don't support interrupts on the BMC). Check | |
1723 | * for this and handle it properly. | |
1724 | */ | |
1725 | static void check_clr_rcv_irq(struct smi_info *smi_info) | |
1726 | { | |
1727 | u8 enables = 0; | |
1728 | int rv; | |
1729 | ||
1730 | rv = get_global_enables(smi_info, &enables); | |
1731 | if (!rv) { | |
1732 | if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0) | |
1733 | /* Already clear, should work ok. */ | |
1734 | return; | |
1735 | ||
1736 | enables &= ~IPMI_BMC_RCV_MSG_INTR; | |
1737 | rv = set_global_enables(smi_info, enables); | |
1738 | } | |
1739 | ||
1740 | if (rv < 0) { | |
910840f2 | 1741 | dev_err(smi_info->io.dev, |
d0882897 CM |
1742 | "Cannot check clearing the rcv irq: %d\n", rv); |
1743 | return; | |
1744 | } | |
1745 | ||
1746 | if (rv) { | |
1e7d6a45 CM |
1747 | /* |
1748 | * An error when setting the event buffer bit means | |
1749 | * clearing the bit is not supported. | |
1750 | */ | |
910840f2 | 1751 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1752 | "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
1753 | smi_info->cannot_disable_irq = true; | |
1754 | } | |
1755 | } | |
1756 | ||
1757 | /* | |
1758 | * Some BMCs do not support setting the interrupt bits in the global | |
1759 | * enables even if they support interrupts. Clearly bad, but we can | |
1760 | * compensate. | |
1761 | */ | |
1762 | static void check_set_rcv_irq(struct smi_info *smi_info) | |
1763 | { | |
1764 | u8 enables = 0; | |
1765 | int rv; | |
1766 | ||
910840f2 | 1767 | if (!smi_info->io.irq) |
d0882897 CM |
1768 | return; |
1769 | ||
1770 | rv = get_global_enables(smi_info, &enables); | |
1771 | if (!rv) { | |
1772 | enables |= IPMI_BMC_RCV_MSG_INTR; | |
1773 | rv = set_global_enables(smi_info, enables); | |
1774 | } | |
1775 | ||
1776 | if (rv < 0) { | |
910840f2 | 1777 | dev_err(smi_info->io.dev, |
d0882897 CM |
1778 | "Cannot check setting the rcv irq: %d\n", rv); |
1779 | return; | |
1780 | } | |
1781 | ||
1782 | if (rv) { | |
1783 | /* | |
1784 | * An error when setting the event buffer bit means | |
1785 | * setting the bit is not supported. | |
1786 | */ | |
910840f2 | 1787 | dev_warn(smi_info->io.dev, |
d0882897 CM |
1788 | "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
1789 | smi_info->cannot_disable_irq = true; | |
1790 | smi_info->irq_enable_broken = true; | |
1e7d6a45 | 1791 | } |
1e7d6a45 CM |
1792 | } |
1793 | ||
40112ae7 CM |
1794 | static int try_enable_event_buffer(struct smi_info *smi_info) |
1795 | { | |
1796 | unsigned char msg[3]; | |
1797 | unsigned char *resp; | |
1798 | unsigned long resp_len; | |
1799 | int rv = 0; | |
1800 | ||
1801 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1802 | if (!resp) | |
1803 | return -ENOMEM; | |
1804 | ||
1805 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1806 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1807 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); | |
1808 | ||
1809 | rv = wait_for_msg_done(smi_info); | |
1810 | if (rv) { | |
bb2a08c0 | 1811 | pr_warn(PFX "Error getting response from get global enables command, the event buffer is not enabled.\n"); |
40112ae7 CM |
1812 | goto out; |
1813 | } | |
1814 | ||
1815 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1816 | resp, IPMI_MAX_MSG_LENGTH); | |
1817 | ||
1818 | if (resp_len < 4 || | |
1819 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1820 | resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || | |
1821 | resp[2] != 0) { | |
bb2a08c0 | 1822 | pr_warn(PFX "Invalid return from get global enables command, cannot enable the event buffer.\n"); |
40112ae7 CM |
1823 | rv = -EINVAL; |
1824 | goto out; | |
1825 | } | |
1826 | ||
d9b7e4f7 | 1827 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
40112ae7 | 1828 | /* buffer is already enabled, nothing to do. */ |
d9b7e4f7 | 1829 | smi_info->supports_event_msg_buff = true; |
40112ae7 | 1830 | goto out; |
d9b7e4f7 | 1831 | } |
40112ae7 CM |
1832 | |
1833 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1834 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1835 | msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF; | |
1836 | smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); | |
1837 | ||
1838 | rv = wait_for_msg_done(smi_info); | |
1839 | if (rv) { | |
bb2a08c0 | 1840 | pr_warn(PFX "Error getting response from set global, enables command, the event buffer is not enabled.\n"); |
40112ae7 CM |
1841 | goto out; |
1842 | } | |
1843 | ||
1844 | resp_len = smi_info->handlers->get_result(smi_info->si_sm, | |
1845 | resp, IPMI_MAX_MSG_LENGTH); | |
1846 | ||
1847 | if (resp_len < 3 || | |
1848 | resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || | |
1849 | resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { | |
bb2a08c0 | 1850 | pr_warn(PFX "Invalid return from get global, enables command, not enable the event buffer.\n"); |
40112ae7 CM |
1851 | rv = -EINVAL; |
1852 | goto out; | |
1853 | } | |
1854 | ||
1855 | if (resp[2] != 0) | |
1856 | /* | |
1857 | * An error when setting the event buffer bit means | |
1858 | * that the event buffer is not supported. | |
1859 | */ | |
1860 | rv = -ENOENT; | |
d9b7e4f7 CM |
1861 | else |
1862 | smi_info->supports_event_msg_buff = true; | |
1863 | ||
76824852 | 1864 | out: |
40112ae7 CM |
1865 | kfree(resp); |
1866 | return rv; | |
1867 | } | |
1868 | ||
07412736 | 1869 | static int smi_type_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1870 | { |
07412736 | 1871 | struct smi_info *smi = m->private; |
1da177e4 | 1872 | |
910840f2 | 1873 | seq_printf(m, "%s\n", si_to_str[smi->io.si_type]); |
d6c5dc18 | 1874 | |
5e33cd0c | 1875 | return 0; |
1da177e4 LT |
1876 | } |
1877 | ||
07412736 | 1878 | static int smi_type_proc_open(struct inode *inode, struct file *file) |
1da177e4 | 1879 | { |
d9dda78b | 1880 | return single_open(file, smi_type_proc_show, PDE_DATA(inode)); |
07412736 AD |
1881 | } |
1882 | ||
1883 | static const struct file_operations smi_type_proc_ops = { | |
1884 | .open = smi_type_proc_open, | |
1885 | .read = seq_read, | |
1886 | .llseek = seq_lseek, | |
1887 | .release = single_release, | |
1888 | }; | |
1889 | ||
1890 | static int smi_si_stats_proc_show(struct seq_file *m, void *v) | |
1891 | { | |
1892 | struct smi_info *smi = m->private; | |
1da177e4 | 1893 | |
07412736 | 1894 | seq_printf(m, "interrupts_enabled: %d\n", |
910840f2 | 1895 | smi->io.irq && !smi->interrupt_disabled); |
07412736 | 1896 | seq_printf(m, "short_timeouts: %u\n", |
64959e2d | 1897 | smi_get_stat(smi, short_timeouts)); |
07412736 | 1898 | seq_printf(m, "long_timeouts: %u\n", |
64959e2d | 1899 | smi_get_stat(smi, long_timeouts)); |
07412736 | 1900 | seq_printf(m, "idles: %u\n", |
64959e2d | 1901 | smi_get_stat(smi, idles)); |
07412736 | 1902 | seq_printf(m, "interrupts: %u\n", |
64959e2d | 1903 | smi_get_stat(smi, interrupts)); |
07412736 | 1904 | seq_printf(m, "attentions: %u\n", |
64959e2d | 1905 | smi_get_stat(smi, attentions)); |
07412736 | 1906 | seq_printf(m, "flag_fetches: %u\n", |
64959e2d | 1907 | smi_get_stat(smi, flag_fetches)); |
07412736 | 1908 | seq_printf(m, "hosed_count: %u\n", |
64959e2d | 1909 | smi_get_stat(smi, hosed_count)); |
07412736 | 1910 | seq_printf(m, "complete_transactions: %u\n", |
64959e2d | 1911 | smi_get_stat(smi, complete_transactions)); |
07412736 | 1912 | seq_printf(m, "events: %u\n", |
64959e2d | 1913 | smi_get_stat(smi, events)); |
07412736 | 1914 | seq_printf(m, "watchdog_pretimeouts: %u\n", |
64959e2d | 1915 | smi_get_stat(smi, watchdog_pretimeouts)); |
07412736 | 1916 | seq_printf(m, "incoming_messages: %u\n", |
64959e2d | 1917 | smi_get_stat(smi, incoming_messages)); |
07412736 AD |
1918 | return 0; |
1919 | } | |
1da177e4 | 1920 | |
07412736 AD |
1921 | static int smi_si_stats_proc_open(struct inode *inode, struct file *file) |
1922 | { | |
d9dda78b | 1923 | return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode)); |
b361e27b CM |
1924 | } |
1925 | ||
07412736 AD |
1926 | static const struct file_operations smi_si_stats_proc_ops = { |
1927 | .open = smi_si_stats_proc_open, | |
1928 | .read = seq_read, | |
1929 | .llseek = seq_lseek, | |
1930 | .release = single_release, | |
1931 | }; | |
1932 | ||
1933 | static int smi_params_proc_show(struct seq_file *m, void *v) | |
b361e27b | 1934 | { |
07412736 | 1935 | struct smi_info *smi = m->private; |
b361e27b | 1936 | |
d6c5dc18 JP |
1937 | seq_printf(m, |
1938 | "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n", | |
910840f2 | 1939 | si_to_str[smi->io.si_type], |
d6c5dc18 JP |
1940 | addr_space_to_str[smi->io.addr_type], |
1941 | smi->io.addr_data, | |
1942 | smi->io.regspacing, | |
1943 | smi->io.regsize, | |
1944 | smi->io.regshift, | |
910840f2 CM |
1945 | smi->io.irq, |
1946 | smi->io.slave_addr); | |
d6c5dc18 | 1947 | |
5e33cd0c | 1948 | return 0; |
1da177e4 LT |
1949 | } |
1950 | ||
07412736 AD |
1951 | static int smi_params_proc_open(struct inode *inode, struct file *file) |
1952 | { | |
d9dda78b | 1953 | return single_open(file, smi_params_proc_show, PDE_DATA(inode)); |
07412736 AD |
1954 | } |
1955 | ||
1956 | static const struct file_operations smi_params_proc_ops = { | |
1957 | .open = smi_params_proc_open, | |
1958 | .read = seq_read, | |
1959 | .llseek = seq_lseek, | |
1960 | .release = single_release, | |
1961 | }; | |
1962 | ||
3ae0e0f9 CM |
1963 | /* |
1964 | * oem_data_avail_to_receive_msg_avail | |
1965 | * @info - smi_info structure with msg_flags set | |
1966 | * | |
1967 | * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL | |
1968 | * Returns 1 indicating need to re-run handle_flags(). | |
1969 | */ | |
1970 | static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info) | |
1971 | { | |
e8b33617 | 1972 | smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) | |
c305e3d3 | 1973 | RECEIVE_MSG_AVAIL); |
3ae0e0f9 CM |
1974 | return 1; |
1975 | } | |
1976 | ||
1977 | /* | |
1978 | * setup_dell_poweredge_oem_data_handler | |
1979 | * @info - smi_info.device_id must be populated | |
1980 | * | |
1981 | * Systems that match, but have firmware version < 1.40 may assert | |
1982 | * OEM0_DATA_AVAIL on their own, without being told via Set Flags that | |
1983 | * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL | |
1984 | * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags | |
1985 | * as RECEIVE_MSG_AVAIL instead. | |
1986 | * | |
1987 | * As Dell has no plans to release IPMI 1.5 firmware that *ever* | |
1988 | * assert the OEM[012] bits, and if it did, the driver would have to | |
1989 | * change to handle that properly, we don't actually check for the | |
1990 | * firmware version. | |
1991 | * Device ID = 0x20 BMC on PowerEdge 8G servers | |
1992 | * Device Revision = 0x80 | |
1993 | * Firmware Revision1 = 0x01 BMC version 1.40 | |
1994 | * Firmware Revision2 = 0x40 BCD encoded | |
1995 | * IPMI Version = 0x51 IPMI 1.5 | |
1996 | * Manufacturer ID = A2 02 00 Dell IANA | |
1997 | * | |
d5a2b89a CM |
1998 | * Additionally, PowerEdge systems with IPMI < 1.5 may also assert |
1999 | * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL. | |
2000 | * | |
3ae0e0f9 CM |
2001 | */ |
2002 | #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20 | |
2003 | #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80 | |
2004 | #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51 | |
50c812b2 | 2005 | #define DELL_IANA_MFR_ID 0x0002a2 |
3ae0e0f9 CM |
2006 | static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info) |
2007 | { | |
2008 | struct ipmi_device_id *id = &smi_info->device_id; | |
50c812b2 | 2009 | if (id->manufacturer_id == DELL_IANA_MFR_ID) { |
d5a2b89a CM |
2010 | if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID && |
2011 | id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV && | |
50c812b2 | 2012 | id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) { |
d5a2b89a CM |
2013 | smi_info->oem_data_avail_handler = |
2014 | oem_data_avail_to_receive_msg_avail; | |
c305e3d3 CM |
2015 | } else if (ipmi_version_major(id) < 1 || |
2016 | (ipmi_version_major(id) == 1 && | |
2017 | ipmi_version_minor(id) < 5)) { | |
d5a2b89a CM |
2018 | smi_info->oem_data_avail_handler = |
2019 | oem_data_avail_to_receive_msg_avail; | |
2020 | } | |
3ae0e0f9 CM |
2021 | } |
2022 | } | |
2023 | ||
ea94027b CM |
2024 | #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA |
2025 | static void return_hosed_msg_badsize(struct smi_info *smi_info) | |
2026 | { | |
2027 | struct ipmi_smi_msg *msg = smi_info->curr_msg; | |
2028 | ||
25985edc | 2029 | /* Make it a response */ |
ea94027b CM |
2030 | msg->rsp[0] = msg->data[0] | 4; |
2031 | msg->rsp[1] = msg->data[1]; | |
2032 | msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH; | |
2033 | msg->rsp_size = 3; | |
2034 | smi_info->curr_msg = NULL; | |
2035 | deliver_recv_msg(smi_info, msg); | |
2036 | } | |
2037 | ||
2038 | /* | |
2039 | * dell_poweredge_bt_xaction_handler | |
2040 | * @info - smi_info.device_id must be populated | |
2041 | * | |
2042 | * Dell PowerEdge servers with the BT interface (x6xx and 1750) will | |
2043 | * not respond to a Get SDR command if the length of the data | |
2044 | * requested is exactly 0x3A, which leads to command timeouts and no | |
2045 | * data returned. This intercepts such commands, and causes userspace | |
2046 | * callers to try again with a different-sized buffer, which succeeds. | |
2047 | */ | |
2048 | ||
2049 | #define STORAGE_NETFN 0x0A | |
2050 | #define STORAGE_CMD_GET_SDR 0x23 | |
2051 | static int dell_poweredge_bt_xaction_handler(struct notifier_block *self, | |
2052 | unsigned long unused, | |
2053 | void *in) | |
2054 | { | |
2055 | struct smi_info *smi_info = in; | |
2056 | unsigned char *data = smi_info->curr_msg->data; | |
2057 | unsigned int size = smi_info->curr_msg->data_size; | |
2058 | if (size >= 8 && | |
2059 | (data[0]>>2) == STORAGE_NETFN && | |
2060 | data[1] == STORAGE_CMD_GET_SDR && | |
2061 | data[7] == 0x3A) { | |
2062 | return_hosed_msg_badsize(smi_info); | |
2063 | return NOTIFY_STOP; | |
2064 | } | |
2065 | return NOTIFY_DONE; | |
2066 | } | |
2067 | ||
2068 | static struct notifier_block dell_poweredge_bt_xaction_notifier = { | |
2069 | .notifier_call = dell_poweredge_bt_xaction_handler, | |
2070 | }; | |
2071 | ||
2072 | /* | |
2073 | * setup_dell_poweredge_bt_xaction_handler | |
2074 | * @info - smi_info.device_id must be filled in already | |
2075 | * | |
2076 | * Fills in smi_info.device_id.start_transaction_pre_hook | |
2077 | * when we know what function to use there. | |
2078 | */ | |
2079 | static void | |
2080 | setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info) | |
2081 | { | |
2082 | struct ipmi_device_id *id = &smi_info->device_id; | |
50c812b2 | 2083 | if (id->manufacturer_id == DELL_IANA_MFR_ID && |
910840f2 | 2084 | smi_info->io.si_type == SI_BT) |
ea94027b CM |
2085 | register_xaction_notifier(&dell_poweredge_bt_xaction_notifier); |
2086 | } | |
2087 | ||
3ae0e0f9 CM |
2088 | /* |
2089 | * setup_oem_data_handler | |
2090 | * @info - smi_info.device_id must be filled in already | |
2091 | * | |
2092 | * Fills in smi_info.device_id.oem_data_available_handler | |
2093 | * when we know what function to use there. | |
2094 | */ | |
2095 | ||
2096 | static void setup_oem_data_handler(struct smi_info *smi_info) | |
2097 | { | |
2098 | setup_dell_poweredge_oem_data_handler(smi_info); | |
2099 | } | |
2100 | ||
ea94027b CM |
2101 | static void setup_xaction_handlers(struct smi_info *smi_info) |
2102 | { | |
2103 | setup_dell_poweredge_bt_xaction_handler(smi_info); | |
2104 | } | |
2105 | ||
d0882897 CM |
2106 | static void check_for_broken_irqs(struct smi_info *smi_info) |
2107 | { | |
2108 | check_clr_rcv_irq(smi_info); | |
2109 | check_set_rcv_irq(smi_info); | |
2110 | } | |
2111 | ||
a9a2c44f CM |
2112 | static inline void wait_for_timer_and_thread(struct smi_info *smi_info) |
2113 | { | |
b874b985 CM |
2114 | if (smi_info->thread != NULL) |
2115 | kthread_stop(smi_info->thread); | |
2116 | if (smi_info->timer_running) | |
453823ba | 2117 | del_timer_sync(&smi_info->si_timer); |
a9a2c44f CM |
2118 | } |
2119 | ||
7e030d6d | 2120 | static struct smi_info *find_dup_si(struct smi_info *info) |
1da177e4 | 2121 | { |
b0defcdb | 2122 | struct smi_info *e; |
1da177e4 | 2123 | |
b0defcdb CM |
2124 | list_for_each_entry(e, &smi_infos, link) { |
2125 | if (e->io.addr_type != info->io.addr_type) | |
2126 | continue; | |
94671710 CM |
2127 | if (e->io.addr_data == info->io.addr_data) { |
2128 | /* | |
2129 | * This is a cheap hack, ACPI doesn't have a defined | |
2130 | * slave address but SMBIOS does. Pick it up from | |
2131 | * any source that has it available. | |
2132 | */ | |
910840f2 CM |
2133 | if (info->io.slave_addr && !e->io.slave_addr) |
2134 | e->io.slave_addr = info->io.slave_addr; | |
7e030d6d | 2135 | return e; |
94671710 | 2136 | } |
b0defcdb | 2137 | } |
1da177e4 | 2138 | |
7e030d6d | 2139 | return NULL; |
b0defcdb | 2140 | } |
1da177e4 | 2141 | |
bb398a4c | 2142 | int ipmi_si_add_smi(struct si_sm_io *io) |
b0defcdb | 2143 | { |
2407d77a | 2144 | int rv = 0; |
bb398a4c | 2145 | struct smi_info *new_smi, *dup; |
b0defcdb | 2146 | |
bb398a4c CM |
2147 | if (!io->io_setup) { |
2148 | if (io->addr_type == IPMI_IO_ADDR_SPACE) { | |
2149 | io->io_setup = port_setup; | |
2150 | } else if (io->addr_type == IPMI_MEM_ADDR_SPACE) { | |
2151 | io->io_setup = mem_setup; | |
e1eeb7f8 CM |
2152 | } else { |
2153 | return -EINVAL; | |
2154 | } | |
2155 | } | |
2156 | ||
bb398a4c CM |
2157 | new_smi = smi_info_alloc(); |
2158 | if (!new_smi) | |
2159 | return -ENOMEM; | |
2160 | ||
2161 | new_smi->io = *io; | |
2162 | ||
d6dfd131 | 2163 | mutex_lock(&smi_infos_lock); |
7e030d6d CM |
2164 | dup = find_dup_si(new_smi); |
2165 | if (dup) { | |
910840f2 CM |
2166 | if (new_smi->io.addr_source == SI_ACPI && |
2167 | dup->io.addr_source == SI_SMBIOS) { | |
7e030d6d | 2168 | /* We prefer ACPI over SMBIOS. */ |
910840f2 | 2169 | dev_info(dup->io.dev, |
7e030d6d | 2170 | "Removing SMBIOS-specified %s state machine in favor of ACPI\n", |
910840f2 | 2171 | si_to_str[new_smi->io.si_type]); |
7e030d6d CM |
2172 | cleanup_one_si(dup); |
2173 | } else { | |
910840f2 | 2174 | dev_info(new_smi->io.dev, |
7e030d6d | 2175 | "%s-specified %s state machine: duplicate\n", |
910840f2 CM |
2176 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
2177 | si_to_str[new_smi->io.si_type]); | |
7e030d6d CM |
2178 | rv = -EBUSY; |
2179 | goto out_err; | |
2180 | } | |
b0defcdb | 2181 | } |
1da177e4 | 2182 | |
bb2a08c0 | 2183 | pr_info(PFX "Adding %s-specified %s state machine\n", |
910840f2 CM |
2184 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
2185 | si_to_str[new_smi->io.si_type]); | |
2407d77a | 2186 | |
1da177e4 LT |
2187 | /* So we know not to free it unless we have allocated one. */ |
2188 | new_smi->intf = NULL; | |
2189 | new_smi->si_sm = NULL; | |
2190 | new_smi->handlers = NULL; | |
2191 | ||
2407d77a MG |
2192 | list_add_tail(&new_smi->link, &smi_infos); |
2193 | ||
bb398a4c CM |
2194 | if (initialized) { |
2195 | rv = try_smi_init(new_smi); | |
2196 | if (rv) { | |
2197 | mutex_unlock(&smi_infos_lock); | |
2198 | cleanup_one_si(new_smi); | |
2199 | return rv; | |
2200 | } | |
2201 | } | |
2407d77a MG |
2202 | out_err: |
2203 | mutex_unlock(&smi_infos_lock); | |
2204 | return rv; | |
2205 | } | |
2206 | ||
3f724c40 TC |
2207 | /* |
2208 | * Try to start up an interface. Must be called with smi_infos_lock | |
2209 | * held, primarily to keep smi_num consistent, we only one to do these | |
2210 | * one at a time. | |
2211 | */ | |
2407d77a MG |
2212 | static int try_smi_init(struct smi_info *new_smi) |
2213 | { | |
2214 | int rv = 0; | |
2215 | int i; | |
1abf71ee | 2216 | char *init_name = NULL; |
2407d77a | 2217 | |
bb2a08c0 | 2218 | pr_info(PFX "Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n", |
910840f2 CM |
2219 | ipmi_addr_src_to_str(new_smi->io.addr_source), |
2220 | si_to_str[new_smi->io.si_type], | |
bb2a08c0 CM |
2221 | addr_space_to_str[new_smi->io.addr_type], |
2222 | new_smi->io.addr_data, | |
910840f2 | 2223 | new_smi->io.slave_addr, new_smi->io.irq); |
2407d77a | 2224 | |
910840f2 | 2225 | switch (new_smi->io.si_type) { |
b0defcdb | 2226 | case SI_KCS: |
1da177e4 | 2227 | new_smi->handlers = &kcs_smi_handlers; |
b0defcdb CM |
2228 | break; |
2229 | ||
2230 | case SI_SMIC: | |
1da177e4 | 2231 | new_smi->handlers = &smic_smi_handlers; |
b0defcdb CM |
2232 | break; |
2233 | ||
2234 | case SI_BT: | |
1da177e4 | 2235 | new_smi->handlers = &bt_smi_handlers; |
b0defcdb CM |
2236 | break; |
2237 | ||
2238 | default: | |
1da177e4 LT |
2239 | /* No support for anything else yet. */ |
2240 | rv = -EIO; | |
2241 | goto out_err; | |
2242 | } | |
2243 | ||
3f724c40 TC |
2244 | new_smi->intf_num = smi_num; |
2245 | ||
1abf71ee | 2246 | /* Do this early so it's available for logs. */ |
910840f2 | 2247 | if (!new_smi->io.dev) { |
3f724c40 TC |
2248 | init_name = kasprintf(GFP_KERNEL, "ipmi_si.%d", |
2249 | new_smi->intf_num); | |
1abf71ee CM |
2250 | |
2251 | /* | |
2252 | * If we don't already have a device from something | |
2253 | * else (like PCI), then register a new one. | |
2254 | */ | |
2255 | new_smi->pdev = platform_device_alloc("ipmi_si", | |
2256 | new_smi->intf_num); | |
2257 | if (!new_smi->pdev) { | |
2258 | pr_err(PFX "Unable to allocate platform device\n"); | |
2259 | goto out_err; | |
2260 | } | |
910840f2 | 2261 | new_smi->io.dev = &new_smi->pdev->dev; |
9d70029e | 2262 | new_smi->io.dev->driver = &ipmi_platform_driver.driver; |
1abf71ee | 2263 | /* Nulled by device_add() */ |
910840f2 | 2264 | new_smi->io.dev->init_name = init_name; |
1abf71ee CM |
2265 | } |
2266 | ||
1da177e4 LT |
2267 | /* Allocate the state machine's data and initialize it. */ |
2268 | new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL); | |
b0defcdb | 2269 | if (!new_smi->si_sm) { |
bb2a08c0 | 2270 | pr_err(PFX "Could not allocate state machine memory\n"); |
1da177e4 LT |
2271 | rv = -ENOMEM; |
2272 | goto out_err; | |
2273 | } | |
e1eeb7f8 CM |
2274 | new_smi->io.io_size = new_smi->handlers->init_data(new_smi->si_sm, |
2275 | &new_smi->io); | |
1da177e4 LT |
2276 | |
2277 | /* Now that we know the I/O size, we can set up the I/O. */ | |
e1eeb7f8 | 2278 | rv = new_smi->io.io_setup(&new_smi->io); |
1da177e4 | 2279 | if (rv) { |
910840f2 | 2280 | dev_err(new_smi->io.dev, "Could not set up I/O space\n"); |
1da177e4 LT |
2281 | goto out_err; |
2282 | } | |
2283 | ||
1da177e4 LT |
2284 | /* Do low-level detection first. */ |
2285 | if (new_smi->handlers->detect(new_smi->si_sm)) { | |
910840f2 CM |
2286 | if (new_smi->io.addr_source) |
2287 | dev_err(new_smi->io.dev, | |
2288 | "Interface detection failed\n"); | |
1da177e4 LT |
2289 | rv = -ENODEV; |
2290 | goto out_err; | |
2291 | } | |
2292 | ||
c305e3d3 CM |
2293 | /* |
2294 | * Attempt a get device id command. If it fails, we probably | |
2295 | * don't have a BMC here. | |
2296 | */ | |
1da177e4 | 2297 | rv = try_get_dev_id(new_smi); |
b0defcdb | 2298 | if (rv) { |
910840f2 CM |
2299 | if (new_smi->io.addr_source) |
2300 | dev_err(new_smi->io.dev, | |
2301 | "There appears to be no BMC at this location\n"); | |
1da177e4 | 2302 | goto out_err; |
b0defcdb | 2303 | } |
1da177e4 | 2304 | |
3ae0e0f9 | 2305 | setup_oem_data_handler(new_smi); |
ea94027b | 2306 | setup_xaction_handlers(new_smi); |
d0882897 | 2307 | check_for_broken_irqs(new_smi); |
3ae0e0f9 | 2308 | |
b874b985 | 2309 | new_smi->waiting_msg = NULL; |
1da177e4 LT |
2310 | new_smi->curr_msg = NULL; |
2311 | atomic_set(&new_smi->req_events, 0); | |
7aefac26 | 2312 | new_smi->run_to_completion = false; |
64959e2d CM |
2313 | for (i = 0; i < SI_NUM_STATS; i++) |
2314 | atomic_set(&new_smi->stats[i], 0); | |
1da177e4 | 2315 | |
7aefac26 | 2316 | new_smi->interrupt_disabled = true; |
89986496 | 2317 | atomic_set(&new_smi->need_watch, 0); |
1da177e4 | 2318 | |
40112ae7 CM |
2319 | rv = try_enable_event_buffer(new_smi); |
2320 | if (rv == 0) | |
7aefac26 | 2321 | new_smi->has_event_buffer = true; |
40112ae7 | 2322 | |
c305e3d3 CM |
2323 | /* |
2324 | * Start clearing the flags before we enable interrupts or the | |
2325 | * timer to avoid racing with the timer. | |
2326 | */ | |
0cfec916 | 2327 | start_clear_flags(new_smi, false); |
d9b7e4f7 CM |
2328 | |
2329 | /* | |
2330 | * IRQ is defined to be set when non-zero. req_events will | |
2331 | * cause a global flags check that will enable interrupts. | |
2332 | */ | |
910840f2 | 2333 | if (new_smi->io.irq) { |
d9b7e4f7 CM |
2334 | new_smi->interrupt_disabled = false; |
2335 | atomic_set(&new_smi->req_events, 1); | |
2336 | } | |
1da177e4 | 2337 | |
1abf71ee | 2338 | if (new_smi->pdev) { |
b48f5457 | 2339 | rv = platform_device_add(new_smi->pdev); |
50c812b2 | 2340 | if (rv) { |
910840f2 | 2341 | dev_err(new_smi->io.dev, |
bb2a08c0 CM |
2342 | "Unable to register system interface device: %d\n", |
2343 | rv); | |
453823ba | 2344 | goto out_err; |
50c812b2 | 2345 | } |
50c812b2 CM |
2346 | } |
2347 | ||
1da177e4 LT |
2348 | rv = ipmi_register_smi(&handlers, |
2349 | new_smi, | |
910840f2 CM |
2350 | new_smi->io.dev, |
2351 | new_smi->io.slave_addr); | |
1da177e4 | 2352 | if (rv) { |
910840f2 CM |
2353 | dev_err(new_smi->io.dev, |
2354 | "Unable to register device: error %d\n", | |
279fbd0c | 2355 | rv); |
1da177e4 LT |
2356 | goto out_err_stop_timer; |
2357 | } | |
2358 | ||
2359 | rv = ipmi_smi_add_proc_entry(new_smi->intf, "type", | |
07412736 | 2360 | &smi_type_proc_ops, |
99b76233 | 2361 | new_smi); |
1da177e4 | 2362 | if (rv) { |
910840f2 CM |
2363 | dev_err(new_smi->io.dev, |
2364 | "Unable to create proc entry: %d\n", rv); | |
1da177e4 LT |
2365 | goto out_err_stop_timer; |
2366 | } | |
2367 | ||
2368 | rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats", | |
07412736 | 2369 | &smi_si_stats_proc_ops, |
99b76233 | 2370 | new_smi); |
1da177e4 | 2371 | if (rv) { |
910840f2 CM |
2372 | dev_err(new_smi->io.dev, |
2373 | "Unable to create proc entry: %d\n", rv); | |
1da177e4 LT |
2374 | goto out_err_stop_timer; |
2375 | } | |
2376 | ||
b361e27b | 2377 | rv = ipmi_smi_add_proc_entry(new_smi->intf, "params", |
07412736 | 2378 | &smi_params_proc_ops, |
99b76233 | 2379 | new_smi); |
b361e27b | 2380 | if (rv) { |
910840f2 CM |
2381 | dev_err(new_smi->io.dev, |
2382 | "Unable to create proc entry: %d\n", rv); | |
b361e27b CM |
2383 | goto out_err_stop_timer; |
2384 | } | |
2385 | ||
3f724c40 TC |
2386 | /* Don't increment till we know we have succeeded. */ |
2387 | smi_num++; | |
2388 | ||
910840f2 CM |
2389 | dev_info(new_smi->io.dev, "IPMI %s interface initialized\n", |
2390 | si_to_str[new_smi->io.si_type]); | |
1da177e4 | 2391 | |
910840f2 | 2392 | WARN_ON(new_smi->io.dev->init_name != NULL); |
1abf71ee CM |
2393 | kfree(init_name); |
2394 | ||
1da177e4 LT |
2395 | return 0; |
2396 | ||
76824852 | 2397 | out_err_stop_timer: |
a9a2c44f | 2398 | wait_for_timer_and_thread(new_smi); |
1da177e4 | 2399 | |
76824852 | 2400 | out_err: |
7aefac26 | 2401 | new_smi->interrupt_disabled = true; |
2407d77a MG |
2402 | |
2403 | if (new_smi->intf) { | |
b874b985 | 2404 | ipmi_smi_t intf = new_smi->intf; |
2407d77a | 2405 | new_smi->intf = NULL; |
b874b985 | 2406 | ipmi_unregister_smi(intf); |
2407d77a | 2407 | } |
1da177e4 | 2408 | |
4f3e8199 CM |
2409 | if (new_smi->io.irq_cleanup) { |
2410 | new_smi->io.irq_cleanup(&new_smi->io); | |
2411 | new_smi->io.irq_cleanup = NULL; | |
2407d77a | 2412 | } |
1da177e4 | 2413 | |
c305e3d3 CM |
2414 | /* |
2415 | * Wait until we know that we are out of any interrupt | |
2416 | * handlers might have been running before we freed the | |
2417 | * interrupt. | |
2418 | */ | |
fbd568a3 | 2419 | synchronize_sched(); |
1da177e4 LT |
2420 | |
2421 | if (new_smi->si_sm) { | |
2422 | if (new_smi->handlers) | |
2423 | new_smi->handlers->cleanup(new_smi->si_sm); | |
2424 | kfree(new_smi->si_sm); | |
2407d77a | 2425 | new_smi->si_sm = NULL; |
1da177e4 | 2426 | } |
910840f2 CM |
2427 | if (new_smi->io.addr_source_cleanup) { |
2428 | new_smi->io.addr_source_cleanup(&new_smi->io); | |
2429 | new_smi->io.addr_source_cleanup = NULL; | |
2407d77a | 2430 | } |
e1eeb7f8 CM |
2431 | if (new_smi->io.io_cleanup) { |
2432 | new_smi->io.io_cleanup(&new_smi->io); | |
2433 | new_smi->io.io_cleanup = NULL; | |
2407d77a | 2434 | } |
1da177e4 | 2435 | |
910840f2 | 2436 | if (new_smi->pdev) { |
50c812b2 | 2437 | platform_device_unregister(new_smi->pdev); |
1abf71ee CM |
2438 | new_smi->pdev = NULL; |
2439 | } else if (new_smi->pdev) { | |
2440 | platform_device_put(new_smi->pdev); | |
2407d77a | 2441 | } |
b0defcdb | 2442 | |
1abf71ee CM |
2443 | kfree(init_name); |
2444 | ||
1da177e4 LT |
2445 | return rv; |
2446 | } | |
2447 | ||
2223cbec | 2448 | static int init_ipmi_si(void) |
1da177e4 | 2449 | { |
2407d77a | 2450 | struct smi_info *e; |
06ee4594 | 2451 | enum ipmi_addr_src type = SI_INVALID; |
1da177e4 LT |
2452 | |
2453 | if (initialized) | |
2454 | return 0; | |
1da177e4 | 2455 | |
bb2a08c0 | 2456 | pr_info("IPMI System Interface driver.\n"); |
1da177e4 | 2457 | |
d8cc5267 | 2458 | /* If the user gave us a device, they presumably want us to use it */ |
7a453308 CM |
2459 | if (!ipmi_si_hardcode_find_bmc()) |
2460 | goto do_scan; | |
d8cc5267 | 2461 | |
9d70029e CM |
2462 | ipmi_si_platform_init(); |
2463 | ||
13d0b35c | 2464 | ipmi_si_pci_init(); |
b0defcdb | 2465 | |
c6f85a75 | 2466 | ipmi_si_parisc_init(); |
fdbeb7de | 2467 | |
06ee4594 MG |
2468 | /* We prefer devices with interrupts, but in the case of a machine |
2469 | with multiple BMCs we assume that there will be several instances | |
2470 | of a given type so if we succeed in registering a type then also | |
2471 | try to register everything else of the same type */ | |
7a453308 | 2472 | do_scan: |
2407d77a MG |
2473 | mutex_lock(&smi_infos_lock); |
2474 | list_for_each_entry(e, &smi_infos, link) { | |
06ee4594 MG |
2475 | /* Try to register a device if it has an IRQ and we either |
2476 | haven't successfully registered a device yet or this | |
2477 | device has the same type as one we successfully registered */ | |
910840f2 | 2478 | if (e->io.irq && (!type || e->io.addr_source == type)) { |
d8cc5267 | 2479 | if (!try_smi_init(e)) { |
910840f2 | 2480 | type = e->io.addr_source; |
d8cc5267 MG |
2481 | } |
2482 | } | |
2483 | } | |
2484 | ||
06ee4594 | 2485 | /* type will only have been set if we successfully registered an si */ |
bb398a4c CM |
2486 | if (type) |
2487 | goto skip_fallback_noirq; | |
06ee4594 | 2488 | |
d8cc5267 MG |
2489 | /* Fall back to the preferred device */ |
2490 | ||
2491 | list_for_each_entry(e, &smi_infos, link) { | |
910840f2 | 2492 | if (!e->io.irq && (!type || e->io.addr_source == type)) { |
d8cc5267 | 2493 | if (!try_smi_init(e)) { |
910840f2 | 2494 | type = e->io.addr_source; |
d8cc5267 MG |
2495 | } |
2496 | } | |
2407d77a | 2497 | } |
bb398a4c CM |
2498 | |
2499 | skip_fallback_noirq: | |
2500 | initialized = 1; | |
2407d77a MG |
2501 | mutex_unlock(&smi_infos_lock); |
2502 | ||
06ee4594 MG |
2503 | if (type) |
2504 | return 0; | |
2505 | ||
d6dfd131 | 2506 | mutex_lock(&smi_infos_lock); |
b361e27b | 2507 | if (unload_when_empty && list_empty(&smi_infos)) { |
d6dfd131 | 2508 | mutex_unlock(&smi_infos_lock); |
d2478521 | 2509 | cleanup_ipmi_si(); |
bb2a08c0 | 2510 | pr_warn(PFX "Unable to find any System Interface(s)\n"); |
1da177e4 | 2511 | return -ENODEV; |
b0defcdb | 2512 | } else { |
d6dfd131 | 2513 | mutex_unlock(&smi_infos_lock); |
b0defcdb | 2514 | return 0; |
1da177e4 | 2515 | } |
1da177e4 LT |
2516 | } |
2517 | module_init(init_ipmi_si); | |
2518 | ||
b361e27b | 2519 | static void cleanup_one_si(struct smi_info *to_clean) |
1da177e4 | 2520 | { |
2407d77a | 2521 | int rv = 0; |
1da177e4 | 2522 | |
b0defcdb | 2523 | if (!to_clean) |
1da177e4 LT |
2524 | return; |
2525 | ||
b874b985 CM |
2526 | if (to_clean->intf) { |
2527 | ipmi_smi_t intf = to_clean->intf; | |
2528 | ||
2529 | to_clean->intf = NULL; | |
2530 | rv = ipmi_unregister_smi(intf); | |
2531 | if (rv) { | |
2532 | pr_err(PFX "Unable to unregister device: errno=%d\n", | |
2533 | rv); | |
2534 | } | |
2535 | } | |
2536 | ||
b0defcdb CM |
2537 | list_del(&to_clean->link); |
2538 | ||
c305e3d3 | 2539 | /* |
b874b985 CM |
2540 | * Make sure that interrupts, the timer and the thread are |
2541 | * stopped and will not run again. | |
c305e3d3 | 2542 | */ |
4f3e8199 CM |
2543 | if (to_clean->io.irq_cleanup) |
2544 | to_clean->io.irq_cleanup(&to_clean->io); | |
a9a2c44f | 2545 | wait_for_timer_and_thread(to_clean); |
1da177e4 | 2546 | |
c305e3d3 CM |
2547 | /* |
2548 | * Timeouts are stopped, now make sure the interrupts are off | |
b874b985 CM |
2549 | * in the BMC. Note that timers and CPU interrupts are off, |
2550 | * so no need for locks. | |
c305e3d3 | 2551 | */ |
ee6cd5f8 | 2552 | while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) { |
ee6cd5f8 CM |
2553 | poll(to_clean); |
2554 | schedule_timeout_uninterruptible(1); | |
ee6cd5f8 | 2555 | } |
7e030d6d CM |
2556 | if (to_clean->handlers) |
2557 | disable_si_irq(to_clean, false); | |
e8b33617 | 2558 | while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) { |
1da177e4 | 2559 | poll(to_clean); |
da4cd8df | 2560 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
2561 | } |
2562 | ||
2407d77a MG |
2563 | if (to_clean->handlers) |
2564 | to_clean->handlers->cleanup(to_clean->si_sm); | |
1da177e4 LT |
2565 | |
2566 | kfree(to_clean->si_sm); | |
2567 | ||
910840f2 CM |
2568 | if (to_clean->io.addr_source_cleanup) |
2569 | to_clean->io.addr_source_cleanup(&to_clean->io); | |
e1eeb7f8 CM |
2570 | if (to_clean->io.io_cleanup) |
2571 | to_clean->io.io_cleanup(&to_clean->io); | |
50c812b2 | 2572 | |
910840f2 | 2573 | if (to_clean->pdev) |
50c812b2 CM |
2574 | platform_device_unregister(to_clean->pdev); |
2575 | ||
2576 | kfree(to_clean); | |
1da177e4 LT |
2577 | } |
2578 | ||
bb398a4c CM |
2579 | int ipmi_si_remove_by_dev(struct device *dev) |
2580 | { | |
2581 | struct smi_info *e; | |
2582 | int rv = -ENOENT; | |
2583 | ||
2584 | mutex_lock(&smi_infos_lock); | |
2585 | list_for_each_entry(e, &smi_infos, link) { | |
2586 | if (e->io.dev == dev) { | |
2587 | cleanup_one_si(e); | |
2588 | rv = 0; | |
2589 | break; | |
2590 | } | |
2591 | } | |
2592 | mutex_unlock(&smi_infos_lock); | |
2593 | ||
2594 | return rv; | |
2595 | } | |
2596 | ||
44814ec9 CM |
2597 | void ipmi_si_remove_by_data(int addr_space, enum si_type si_type, |
2598 | unsigned long addr) | |
2599 | { | |
2600 | /* remove */ | |
2601 | struct smi_info *e, *tmp_e; | |
2602 | ||
2603 | mutex_lock(&smi_infos_lock); | |
2604 | list_for_each_entry_safe(e, tmp_e, &smi_infos, link) { | |
2605 | if (e->io.addr_type != addr_space) | |
2606 | continue; | |
2607 | if (e->io.si_type != si_type) | |
2608 | continue; | |
2609 | if (e->io.addr_data == addr) | |
2610 | cleanup_one_si(e); | |
2611 | } | |
2612 | mutex_unlock(&smi_infos_lock); | |
2613 | } | |
2614 | ||
0dcf334c | 2615 | static void cleanup_ipmi_si(void) |
1da177e4 | 2616 | { |
b0defcdb | 2617 | struct smi_info *e, *tmp_e; |
1da177e4 | 2618 | |
b0defcdb | 2619 | if (!initialized) |
1da177e4 LT |
2620 | return; |
2621 | ||
13d0b35c | 2622 | ipmi_si_pci_shutdown(); |
c6f85a75 CM |
2623 | |
2624 | ipmi_si_parisc_shutdown(); | |
b0defcdb | 2625 | |
9d70029e | 2626 | ipmi_si_platform_shutdown(); |
dba9b4f6 | 2627 | |
d6dfd131 | 2628 | mutex_lock(&smi_infos_lock); |
b0defcdb CM |
2629 | list_for_each_entry_safe(e, tmp_e, &smi_infos, link) |
2630 | cleanup_one_si(e); | |
d6dfd131 | 2631 | mutex_unlock(&smi_infos_lock); |
1da177e4 LT |
2632 | } |
2633 | module_exit(cleanup_ipmi_si); | |
2634 | ||
0944d889 | 2635 | MODULE_ALIAS("platform:dmi-ipmi-si"); |
1da177e4 | 2636 | MODULE_LICENSE("GPL"); |
1fdd75bd | 2637 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
c305e3d3 CM |
2638 | MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT" |
2639 | " system interfaces."); |