Commit | Line | Data |
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89eb8eb9 DN |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
45d9ca49 | 6 | * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved. |
89eb8eb9 DN |
7 | */ |
8 | ||
89eb8eb9 DN |
9 | /* |
10 | * Cross Partition Communication (XPC) support - standard version. | |
11 | * | |
12 | * XPC provides a message passing capability that crosses partition | |
13 | * boundaries. This module is made up of two parts: | |
14 | * | |
15 | * partition This part detects the presence/absence of other | |
16 | * partitions. It provides a heartbeat and monitors | |
17 | * the heartbeats of other partitions. | |
18 | * | |
19 | * channel This part manages the channels and sends/receives | |
20 | * messages across them to/from other partitions. | |
21 | * | |
22 | * There are a couple of additional functions residing in XP, which | |
23 | * provide an interface to XPC for its users. | |
24 | * | |
25 | * | |
26 | * Caveats: | |
27 | * | |
28 | * . We currently have no way to determine which nasid an IPI came | |
a47d5dac | 29 | * from. Thus, >>> xpc_IPI_send() does a remote AMO write followed by |
89eb8eb9 DN |
30 | * an IPI. The AMO indicates where data is to be pulled from, so |
31 | * after the IPI arrives, the remote partition checks the AMO word. | |
32 | * The IPI can actually arrive before the AMO however, so other code | |
33 | * must periodically check for this case. Also, remote AMO operations | |
34 | * do not reliably time out. Thus we do a remote PIO read solely to | |
35 | * know whether the remote partition is down and whether we should | |
36 | * stop sending IPIs to it. This remote PIO read operation is set up | |
37 | * in a special nofault region so SAL knows to ignore (and cleanup) | |
38 | * any errors due to the remote AMO write, PIO read, and/or PIO | |
39 | * write operations. | |
40 | * | |
41 | * If/when new hardware solves this IPI problem, we should abandon | |
42 | * the current approach. | |
43 | * | |
44 | */ | |
45 | ||
89eb8eb9 DN |
46 | #include <linux/kernel.h> |
47 | #include <linux/module.h> | |
48 | #include <linux/init.h> | |
89eb8eb9 DN |
49 | #include <linux/cache.h> |
50 | #include <linux/interrupt.h> | |
69913927 | 51 | #include <linux/delay.h> |
a607c389 | 52 | #include <linux/reboot.h> |
f9e505a9 | 53 | #include <linux/completion.h> |
1eeb66a1 | 54 | #include <linux/kdebug.h> |
2c2b94f9 DN |
55 | #include <linux/kthread.h> |
56 | #include <linux/uaccess.h> | |
89eb8eb9 DN |
57 | #include <asm/sn/intr.h> |
58 | #include <asm/sn/sn_sal.h> | |
45d9ca49 | 59 | #include "xpc.h" |
89eb8eb9 | 60 | |
89eb8eb9 DN |
61 | /* define two XPC debug device structures to be used with dev_dbg() et al */ |
62 | ||
63 | struct device_driver xpc_dbg_name = { | |
64 | .name = "xpc" | |
65 | }; | |
66 | ||
67 | struct device xpc_part_dbg_subname = { | |
68 | .bus_id = {0}, /* set to "part" at xpc_init() time */ | |
69 | .driver = &xpc_dbg_name | |
70 | }; | |
71 | ||
72 | struct device xpc_chan_dbg_subname = { | |
73 | .bus_id = {0}, /* set to "chan" at xpc_init() time */ | |
74 | .driver = &xpc_dbg_name | |
75 | }; | |
76 | ||
77 | struct device *xpc_part = &xpc_part_dbg_subname; | |
78 | struct device *xpc_chan = &xpc_chan_dbg_subname; | |
79 | ||
1f4674b2 DN |
80 | static int xpc_kdebug_ignore; |
81 | ||
89eb8eb9 DN |
82 | /* systune related variables for /proc/sys directories */ |
83 | ||
a607c389 DN |
84 | static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL; |
85 | static int xpc_hb_min_interval = 1; | |
86 | static int xpc_hb_max_interval = 10; | |
89eb8eb9 | 87 | |
a607c389 DN |
88 | static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL; |
89 | static int xpc_hb_check_min_interval = 10; | |
90 | static int xpc_hb_check_max_interval = 120; | |
89eb8eb9 | 91 | |
a47d5dac DN |
92 | int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT; |
93 | static int xpc_disengage_min_timelimit; /* = 0 */ | |
94 | static int xpc_disengage_max_timelimit = 120; | |
89eb8eb9 DN |
95 | |
96 | static ctl_table xpc_sys_xpc_hb_dir[] = { | |
97 | { | |
35190506 DN |
98 | .ctl_name = CTL_UNNUMBERED, |
99 | .procname = "hb_interval", | |
100 | .data = &xpc_hb_interval, | |
101 | .maxlen = sizeof(int), | |
102 | .mode = 0644, | |
103 | .proc_handler = &proc_dointvec_minmax, | |
104 | .strategy = &sysctl_intvec, | |
105 | .extra1 = &xpc_hb_min_interval, | |
106 | .extra2 = &xpc_hb_max_interval}, | |
89eb8eb9 | 107 | { |
35190506 DN |
108 | .ctl_name = CTL_UNNUMBERED, |
109 | .procname = "hb_check_interval", | |
110 | .data = &xpc_hb_check_interval, | |
111 | .maxlen = sizeof(int), | |
112 | .mode = 0644, | |
113 | .proc_handler = &proc_dointvec_minmax, | |
114 | .strategy = &sysctl_intvec, | |
115 | .extra1 = &xpc_hb_check_min_interval, | |
116 | .extra2 = &xpc_hb_check_max_interval}, | |
68cbf075 | 117 | {} |
89eb8eb9 DN |
118 | }; |
119 | static ctl_table xpc_sys_xpc_dir[] = { | |
120 | { | |
35190506 DN |
121 | .ctl_name = CTL_UNNUMBERED, |
122 | .procname = "hb", | |
123 | .mode = 0555, | |
124 | .child = xpc_sys_xpc_hb_dir}, | |
e54af724 | 125 | { |
35190506 | 126 | .ctl_name = CTL_UNNUMBERED, |
a47d5dac DN |
127 | .procname = "disengage_timelimit", |
128 | .data = &xpc_disengage_timelimit, | |
35190506 DN |
129 | .maxlen = sizeof(int), |
130 | .mode = 0644, | |
131 | .proc_handler = &proc_dointvec_minmax, | |
132 | .strategy = &sysctl_intvec, | |
a47d5dac DN |
133 | .extra1 = &xpc_disengage_min_timelimit, |
134 | .extra2 = &xpc_disengage_max_timelimit}, | |
68cbf075 | 135 | {} |
89eb8eb9 DN |
136 | }; |
137 | static ctl_table xpc_sys_dir[] = { | |
138 | { | |
35190506 DN |
139 | .ctl_name = CTL_UNNUMBERED, |
140 | .procname = "xpc", | |
141 | .mode = 0555, | |
142 | .child = xpc_sys_xpc_dir}, | |
68cbf075 | 143 | {} |
89eb8eb9 DN |
144 | }; |
145 | static struct ctl_table_header *xpc_sysctl; | |
146 | ||
a47d5dac DN |
147 | /* non-zero if any remote partition disengage was timed out */ |
148 | int xpc_disengage_timedout; | |
89eb8eb9 | 149 | |
6e41017a DN |
150 | /* #of activate IRQs received */ |
151 | atomic_t xpc_activate_IRQ_rcvd = ATOMIC_INIT(0); | |
89eb8eb9 DN |
152 | |
153 | /* IRQ handler notifies this wait queue on receipt of an IRQ */ | |
6e41017a | 154 | DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq); |
89eb8eb9 DN |
155 | |
156 | static unsigned long xpc_hb_check_timeout; | |
33ba3c77 DN |
157 | static struct timer_list xpc_hb_timer; |
158 | void *xpc_heartbeating_to_mask; | |
89eb8eb9 | 159 | |
e54af724 | 160 | /* notification that the xpc_hb_checker thread has exited */ |
f9e505a9 | 161 | static DECLARE_COMPLETION(xpc_hb_checker_exited); |
89eb8eb9 | 162 | |
e54af724 | 163 | /* notification that the xpc_discovery thread has exited */ |
f9e505a9 | 164 | static DECLARE_COMPLETION(xpc_discovery_exited); |
89eb8eb9 | 165 | |
89eb8eb9 DN |
166 | static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *); |
167 | ||
a607c389 DN |
168 | static int xpc_system_reboot(struct notifier_block *, unsigned long, void *); |
169 | static struct notifier_block xpc_reboot_notifier = { | |
170 | .notifier_call = xpc_system_reboot, | |
171 | }; | |
172 | ||
780d09e8 DN |
173 | static int xpc_system_die(struct notifier_block *, unsigned long, void *); |
174 | static struct notifier_block xpc_die_notifier = { | |
175 | .notifier_call = xpc_system_die, | |
176 | }; | |
177 | ||
94bd2708 | 178 | enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *rp); |
33ba3c77 DN |
179 | void (*xpc_heartbeat_init) (void); |
180 | void (*xpc_heartbeat_exit) (void); | |
181 | void (*xpc_increment_heartbeat) (void); | |
182 | void (*xpc_offline_heartbeat) (void); | |
183 | void (*xpc_online_heartbeat) (void); | |
184 | void (*xpc_check_remote_hb) (void); | |
185 | ||
e17d416b | 186 | enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part); |
a47d5dac | 187 | void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *ch); |
e17d416b | 188 | u64 (*xpc_get_IPI_flags) (struct xpc_partition *part); |
a47d5dac DN |
189 | void (*xpc_process_msg_IPI) (struct xpc_partition *part, int ch_number); |
190 | int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *ch); | |
e17d416b | 191 | struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *ch); |
33ba3c77 | 192 | |
a47d5dac DN |
193 | void (*xpc_request_partition_activation) (struct xpc_rsvd_page *remote_rp, |
194 | u64 remote_rp_pa, int nasid); | |
195 | void (*xpc_request_partition_reactivation) (struct xpc_partition *part); | |
196 | void (*xpc_request_partition_deactivation) (struct xpc_partition *part); | |
197 | void (*xpc_cancel_partition_deactivation_request) (struct xpc_partition *part); | |
33ba3c77 | 198 | |
6e41017a | 199 | void (*xpc_process_activate_IRQ_rcvd) (int n_IRQs_expected); |
e17d416b DN |
200 | enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *part); |
201 | void (*xpc_teardown_infrastructure) (struct xpc_partition *part); | |
202 | ||
a47d5dac DN |
203 | void (*xpc_indicate_partition_engaged) (struct xpc_partition *part); |
204 | int (*xpc_partition_engaged) (short partid); | |
205 | int (*xpc_any_partition_engaged) (void); | |
206 | void (*xpc_indicate_partition_disengaged) (struct xpc_partition *part); | |
207 | void (*xpc_assume_partition_disengaged) (short partid); | |
208 | ||
209 | void (*xpc_send_channel_closerequest) (struct xpc_channel *ch, | |
210 | unsigned long *irq_flags); | |
211 | void (*xpc_send_channel_closereply) (struct xpc_channel *ch, | |
212 | unsigned long *irq_flags); | |
213 | void (*xpc_send_channel_openrequest) (struct xpc_channel *ch, | |
214 | unsigned long *irq_flags); | |
215 | void (*xpc_send_channel_openreply) (struct xpc_channel *ch, | |
216 | unsigned long *irq_flags); | |
33ba3c77 | 217 | |
97bf1aa1 DN |
218 | enum xp_retval (*xpc_send_msg) (struct xpc_channel *ch, u32 flags, |
219 | void *payload, u16 payload_size, u8 notify_type, | |
220 | xpc_notify_func func, void *key); | |
33ba3c77 | 221 | void (*xpc_received_msg) (struct xpc_channel *ch, struct xpc_msg *msg); |
94bd2708 | 222 | |
a607c389 | 223 | /* |
a47d5dac | 224 | * Timer function to enforce the timelimit on the partition disengage. |
a607c389 DN |
225 | */ |
226 | static void | |
a47d5dac | 227 | xpc_timeout_partition_disengage(unsigned long data) |
a607c389 | 228 | { |
35190506 | 229 | struct xpc_partition *part = (struct xpc_partition *)data; |
a607c389 | 230 | |
a47d5dac | 231 | DBUG_ON(time_is_after_jiffies(part->disengage_timeout)); |
a607c389 | 232 | |
35190506 | 233 | (void)xpc_partition_disengaged(part); |
a607c389 | 234 | |
a47d5dac DN |
235 | DBUG_ON(part->disengage_timeout != 0); |
236 | DBUG_ON(xpc_partition_engaged(XPC_PARTID(part))); | |
a607c389 DN |
237 | } |
238 | ||
89eb8eb9 DN |
239 | /* |
240 | * Timer to produce the heartbeat. The timer structures function is | |
241 | * already set when this is initially called. A tunable is used to | |
242 | * specify when the next timeout should occur. | |
243 | */ | |
244 | static void | |
245 | xpc_hb_beater(unsigned long dummy) | |
246 | { | |
33ba3c77 | 247 | xpc_increment_heartbeat(); |
89eb8eb9 | 248 | |
aaa3cd69 | 249 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) |
6e41017a | 250 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
89eb8eb9 DN |
251 | |
252 | xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ); | |
253 | add_timer(&xpc_hb_timer); | |
254 | } | |
255 | ||
33ba3c77 DN |
256 | static void |
257 | xpc_start_hb_beater(void) | |
258 | { | |
259 | xpc_heartbeat_init(); | |
260 | init_timer(&xpc_hb_timer); | |
261 | xpc_hb_timer.function = xpc_hb_beater; | |
262 | xpc_hb_beater(0); | |
263 | } | |
264 | ||
265 | static void | |
266 | xpc_stop_hb_beater(void) | |
267 | { | |
268 | del_timer_sync(&xpc_hb_timer); | |
269 | xpc_heartbeat_exit(); | |
270 | } | |
271 | ||
89eb8eb9 DN |
272 | /* |
273 | * This thread is responsible for nearly all of the partition | |
274 | * activation/deactivation. | |
275 | */ | |
276 | static int | |
277 | xpc_hb_checker(void *ignore) | |
278 | { | |
279 | int last_IRQ_count = 0; | |
280 | int new_IRQ_count; | |
35190506 | 281 | int force_IRQ = 0; |
89eb8eb9 DN |
282 | |
283 | /* this thread was marked active by xpc_hb_init() */ | |
284 | ||
0bc3cc03 | 285 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(XPC_HB_CHECK_CPU)); |
89eb8eb9 | 286 | |
4c013f5c | 287 | /* set our heartbeating to other partitions into motion */ |
89eb8eb9 | 288 | xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ); |
33ba3c77 | 289 | xpc_start_hb_beater(); |
89eb8eb9 | 290 | |
2c2b94f9 | 291 | while (!xpc_exiting) { |
89eb8eb9 | 292 | |
89eb8eb9 DN |
293 | dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have " |
294 | "been received\n", | |
35190506 | 295 | (int)(xpc_hb_check_timeout - jiffies), |
6e41017a | 296 | atomic_read(&xpc_activate_IRQ_rcvd) - last_IRQ_count); |
89eb8eb9 | 297 | |
89eb8eb9 | 298 | /* checking of remote heartbeats is skewed by IRQ handling */ |
aaa3cd69 | 299 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) { |
89eb8eb9 DN |
300 | dev_dbg(xpc_part, "checking remote heartbeats\n"); |
301 | xpc_check_remote_hb(); | |
302 | ||
303 | /* | |
304 | * We need to periodically recheck to ensure no | |
305 | * IPI/AMO pairs have been missed. That check | |
306 | * must always reset xpc_hb_check_timeout. | |
307 | */ | |
308 | force_IRQ = 1; | |
309 | } | |
310 | ||
a607c389 | 311 | /* check for outstanding IRQs */ |
6e41017a | 312 | new_IRQ_count = atomic_read(&xpc_activate_IRQ_rcvd); |
89eb8eb9 DN |
313 | if (last_IRQ_count < new_IRQ_count || force_IRQ != 0) { |
314 | force_IRQ = 0; | |
315 | ||
316 | dev_dbg(xpc_part, "found an IRQ to process; will be " | |
317 | "resetting xpc_hb_check_timeout\n"); | |
318 | ||
6e41017a DN |
319 | xpc_process_activate_IRQ_rcvd(new_IRQ_count - |
320 | last_IRQ_count); | |
89eb8eb9 DN |
321 | last_IRQ_count = new_IRQ_count; |
322 | ||
323 | xpc_hb_check_timeout = jiffies + | |
35190506 | 324 | (xpc_hb_check_interval * HZ); |
89eb8eb9 | 325 | } |
a607c389 DN |
326 | |
327 | /* wait for IRQ or timeout */ | |
6e41017a DN |
328 | (void)wait_event_interruptible(xpc_activate_IRQ_wq, |
329 | (last_IRQ_count < atomic_read( | |
330 | &xpc_activate_IRQ_rcvd) | |
aaa3cd69 DN |
331 | || time_is_before_eq_jiffies( |
332 | xpc_hb_check_timeout) || | |
2c2b94f9 | 333 | xpc_exiting)); |
89eb8eb9 DN |
334 | } |
335 | ||
33ba3c77 DN |
336 | xpc_stop_hb_beater(); |
337 | ||
89eb8eb9 DN |
338 | dev_dbg(xpc_part, "heartbeat checker is exiting\n"); |
339 | ||
e54af724 | 340 | /* mark this thread as having exited */ |
f9e505a9 | 341 | complete(&xpc_hb_checker_exited); |
89eb8eb9 DN |
342 | return 0; |
343 | } | |
344 | ||
89eb8eb9 DN |
345 | /* |
346 | * This thread will attempt to discover other partitions to activate | |
347 | * based on info provided by SAL. This new thread is short lived and | |
348 | * will exit once discovery is complete. | |
349 | */ | |
350 | static int | |
351 | xpc_initiate_discovery(void *ignore) | |
352 | { | |
89eb8eb9 DN |
353 | xpc_discovery(); |
354 | ||
355 | dev_dbg(xpc_part, "discovery thread is exiting\n"); | |
356 | ||
e54af724 | 357 | /* mark this thread as having exited */ |
f9e505a9 | 358 | complete(&xpc_discovery_exited); |
89eb8eb9 DN |
359 | return 0; |
360 | } | |
361 | ||
89eb8eb9 DN |
362 | /* |
363 | * The first kthread assigned to a newly activated partition is the one | |
e17d416b | 364 | * created by XPC HB with which it calls xpc_activating(). XPC hangs on to |
89eb8eb9 DN |
365 | * that kthread until the partition is brought down, at which time that kthread |
366 | * returns back to XPC HB. (The return of that kthread will signify to XPC HB | |
367 | * that XPC has dismantled all communication infrastructure for the associated | |
368 | * partition.) This kthread becomes the channel manager for that partition. | |
369 | * | |
370 | * Each active partition has a channel manager, who, besides connecting and | |
371 | * disconnecting channels, will ensure that each of the partition's connected | |
372 | * channels has the required number of assigned kthreads to get the work done. | |
373 | */ | |
374 | static void | |
375 | xpc_channel_mgr(struct xpc_partition *part) | |
376 | { | |
377 | while (part->act_state != XPC_P_DEACTIVATING || | |
35190506 DN |
378 | atomic_read(&part->nchannels_active) > 0 || |
379 | !xpc_partition_disengaged(part)) { | |
89eb8eb9 DN |
380 | |
381 | xpc_process_channel_activity(part); | |
382 | ||
89eb8eb9 DN |
383 | /* |
384 | * Wait until we've been requested to activate kthreads or | |
385 | * all of the channel's message queues have been torn down or | |
386 | * a signal is pending. | |
387 | * | |
388 | * The channel_mgr_requests is set to 1 after being awakened, | |
389 | * This is done to prevent the channel mgr from making one pass | |
390 | * through the loop for each request, since he will | |
391 | * be servicing all the requests in one pass. The reason it's | |
392 | * set to 1 instead of 0 is so that other kthreads will know | |
393 | * that the channel mgr is running and won't bother trying to | |
394 | * wake him up. | |
395 | */ | |
396 | atomic_dec(&part->channel_mgr_requests); | |
35190506 | 397 | (void)wait_event_interruptible(part->channel_mgr_wq, |
2c2b94f9 DN |
398 | (atomic_read(&part->channel_mgr_requests) > 0 || |
399 | part->local_IPI_amo != 0 || | |
400 | (part->act_state == XPC_P_DEACTIVATING && | |
401 | atomic_read(&part->nchannels_active) == 0 && | |
402 | xpc_partition_disengaged(part)))); | |
89eb8eb9 | 403 | atomic_set(&part->channel_mgr_requests, 1); |
89eb8eb9 DN |
404 | } |
405 | } | |
406 | ||
89eb8eb9 DN |
407 | /* |
408 | * When XPC HB determines that a partition has come up, it will create a new | |
409 | * kthread and that kthread will call this function to attempt to set up the | |
410 | * basic infrastructure used for Cross Partition Communication with the newly | |
411 | * upped partition. | |
412 | * | |
413 | * The kthread that was created by XPC HB and which setup the XPC | |
e17d416b DN |
414 | * infrastructure will remain assigned to the partition becoming the channel |
415 | * manager for that partition until the partition is deactivating, at which | |
416 | * time the kthread will teardown the XPC infrastructure and then exit. | |
89eb8eb9 | 417 | */ |
89eb8eb9 DN |
418 | static int |
419 | xpc_activating(void *__partid) | |
420 | { | |
64d032ba | 421 | short partid = (u64)__partid; |
89eb8eb9 DN |
422 | struct xpc_partition *part = &xpc_partitions[partid]; |
423 | unsigned long irq_flags; | |
89eb8eb9 | 424 | |
bc63d387 | 425 | DBUG_ON(partid < 0 || partid >= xp_max_npartitions); |
89eb8eb9 DN |
426 | |
427 | spin_lock_irqsave(&part->act_lock, irq_flags); | |
428 | ||
429 | if (part->act_state == XPC_P_DEACTIVATING) { | |
430 | part->act_state = XPC_P_INACTIVE; | |
431 | spin_unlock_irqrestore(&part->act_lock, irq_flags); | |
432 | part->remote_rp_pa = 0; | |
433 | return 0; | |
434 | } | |
435 | ||
436 | /* indicate the thread is activating */ | |
437 | DBUG_ON(part->act_state != XPC_P_ACTIVATION_REQ); | |
438 | part->act_state = XPC_P_ACTIVATING; | |
439 | ||
440 | XPC_SET_REASON(part, 0, 0); | |
441 | spin_unlock_irqrestore(&part->act_lock, irq_flags); | |
442 | ||
e17d416b | 443 | dev_dbg(xpc_part, "activating partition %d\n", partid); |
89eb8eb9 | 444 | |
33ba3c77 | 445 | xpc_allow_hb(partid); |
89eb8eb9 | 446 | |
e17d416b DN |
447 | if (xpc_setup_infrastructure(part) == xpSuccess) { |
448 | (void)xpc_part_ref(part); /* this will always succeed */ | |
449 | ||
450 | if (xpc_make_first_contact(part) == xpSuccess) { | |
451 | xpc_mark_partition_active(part); | |
452 | xpc_channel_mgr(part); | |
453 | /* won't return until partition is deactivating */ | |
454 | } | |
455 | ||
456 | xpc_part_deref(part); | |
457 | xpc_teardown_infrastructure(part); | |
458 | } | |
89eb8eb9 | 459 | |
33ba3c77 | 460 | xpc_disallow_hb(partid); |
89eb8eb9 DN |
461 | xpc_mark_partition_inactive(part); |
462 | ||
65c17b80 | 463 | if (part->reason == xpReactivating) { |
89eb8eb9 | 464 | /* interrupting ourselves results in activating partition */ |
a47d5dac | 465 | xpc_request_partition_reactivation(part); |
89eb8eb9 DN |
466 | } |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
89eb8eb9 DN |
471 | void |
472 | xpc_activate_partition(struct xpc_partition *part) | |
473 | { | |
64d032ba | 474 | short partid = XPC_PARTID(part); |
89eb8eb9 | 475 | unsigned long irq_flags; |
2c2b94f9 | 476 | struct task_struct *kthread; |
89eb8eb9 | 477 | |
89eb8eb9 DN |
478 | spin_lock_irqsave(&part->act_lock, irq_flags); |
479 | ||
89eb8eb9 DN |
480 | DBUG_ON(part->act_state != XPC_P_INACTIVE); |
481 | ||
7c6c6636 | 482 | part->act_state = XPC_P_ACTIVATION_REQ; |
65c17b80 | 483 | XPC_SET_REASON(part, xpCloneKThread, __LINE__); |
89eb8eb9 DN |
484 | |
485 | spin_unlock_irqrestore(&part->act_lock, irq_flags); | |
7c6c6636 | 486 | |
2c2b94f9 DN |
487 | kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d", |
488 | partid); | |
489 | if (IS_ERR(kthread)) { | |
7c6c6636 RH |
490 | spin_lock_irqsave(&part->act_lock, irq_flags); |
491 | part->act_state = XPC_P_INACTIVE; | |
65c17b80 | 492 | XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__); |
7c6c6636 RH |
493 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
494 | } | |
89eb8eb9 DN |
495 | } |
496 | ||
89eb8eb9 DN |
497 | void |
498 | xpc_activate_kthreads(struct xpc_channel *ch, int needed) | |
499 | { | |
500 | int idle = atomic_read(&ch->kthreads_idle); | |
501 | int assigned = atomic_read(&ch->kthreads_assigned); | |
502 | int wakeup; | |
503 | ||
89eb8eb9 DN |
504 | DBUG_ON(needed <= 0); |
505 | ||
506 | if (idle > 0) { | |
507 | wakeup = (needed > idle) ? idle : needed; | |
508 | needed -= wakeup; | |
509 | ||
510 | dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, " | |
511 | "channel=%d\n", wakeup, ch->partid, ch->number); | |
512 | ||
513 | /* only wakeup the requested number of kthreads */ | |
514 | wake_up_nr(&ch->idle_wq, wakeup); | |
515 | } | |
516 | ||
2c2b94f9 | 517 | if (needed <= 0) |
89eb8eb9 | 518 | return; |
89eb8eb9 DN |
519 | |
520 | if (needed + assigned > ch->kthreads_assigned_limit) { | |
521 | needed = ch->kthreads_assigned_limit - assigned; | |
2c2b94f9 | 522 | if (needed <= 0) |
89eb8eb9 | 523 | return; |
89eb8eb9 DN |
524 | } |
525 | ||
526 | dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n", | |
527 | needed, ch->partid, ch->number); | |
528 | ||
a460ef8d | 529 | xpc_create_kthreads(ch, needed, 0); |
89eb8eb9 DN |
530 | } |
531 | ||
89eb8eb9 DN |
532 | /* |
533 | * This function is where XPC's kthreads wait for messages to deliver. | |
534 | */ | |
535 | static void | |
536 | xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch) | |
537 | { | |
538 | do { | |
539 | /* deliver messages to their intended recipients */ | |
540 | ||
a47d5dac | 541 | while (xpc_n_of_deliverable_msgs(ch) > 0 && |
2c2b94f9 | 542 | !(ch->flags & XPC_C_DISCONNECTING)) { |
89eb8eb9 DN |
543 | xpc_deliver_msg(ch); |
544 | } | |
545 | ||
546 | if (atomic_inc_return(&ch->kthreads_idle) > | |
35190506 | 547 | ch->kthreads_idle_limit) { |
89eb8eb9 DN |
548 | /* too many idle kthreads on this channel */ |
549 | atomic_dec(&ch->kthreads_idle); | |
550 | break; | |
551 | } | |
552 | ||
553 | dev_dbg(xpc_chan, "idle kthread calling " | |
554 | "wait_event_interruptible_exclusive()\n"); | |
555 | ||
35190506 | 556 | (void)wait_event_interruptible_exclusive(ch->idle_wq, |
a47d5dac | 557 | (xpc_n_of_deliverable_msgs(ch) > 0 || |
2c2b94f9 | 558 | (ch->flags & XPC_C_DISCONNECTING))); |
89eb8eb9 DN |
559 | |
560 | atomic_dec(&ch->kthreads_idle); | |
561 | ||
2c2b94f9 | 562 | } while (!(ch->flags & XPC_C_DISCONNECTING)); |
89eb8eb9 DN |
563 | } |
564 | ||
89eb8eb9 | 565 | static int |
2c2b94f9 | 566 | xpc_kthread_start(void *args) |
89eb8eb9 | 567 | { |
64d032ba | 568 | short partid = XPC_UNPACK_ARG1(args); |
89eb8eb9 DN |
569 | u16 ch_number = XPC_UNPACK_ARG2(args); |
570 | struct xpc_partition *part = &xpc_partitions[partid]; | |
571 | struct xpc_channel *ch; | |
572 | int n_needed; | |
e54af724 | 573 | unsigned long irq_flags; |
89eb8eb9 | 574 | |
89eb8eb9 DN |
575 | dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n", |
576 | partid, ch_number); | |
577 | ||
578 | ch = &part->channels[ch_number]; | |
579 | ||
580 | if (!(ch->flags & XPC_C_DISCONNECTING)) { | |
89eb8eb9 DN |
581 | |
582 | /* let registerer know that connection has been established */ | |
583 | ||
e54af724 | 584 | spin_lock_irqsave(&ch->lock, irq_flags); |
4c2cd966 DN |
585 | if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) { |
586 | ch->flags |= XPC_C_CONNECTEDCALLOUT; | |
e54af724 DN |
587 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
588 | ||
89eb8eb9 DN |
589 | xpc_connected_callout(ch); |
590 | ||
4c2cd966 DN |
591 | spin_lock_irqsave(&ch->lock, irq_flags); |
592 | ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE; | |
593 | spin_unlock_irqrestore(&ch->lock, irq_flags); | |
594 | ||
89eb8eb9 DN |
595 | /* |
596 | * It is possible that while the callout was being | |
597 | * made that the remote partition sent some messages. | |
598 | * If that is the case, we may need to activate | |
599 | * additional kthreads to help deliver them. We only | |
600 | * need one less than total #of messages to deliver. | |
601 | */ | |
a47d5dac | 602 | n_needed = xpc_n_of_deliverable_msgs(ch) - 1; |
2c2b94f9 | 603 | if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING)) |
89eb8eb9 | 604 | xpc_activate_kthreads(ch, n_needed); |
2c2b94f9 | 605 | |
e54af724 DN |
606 | } else { |
607 | spin_unlock_irqrestore(&ch->lock, irq_flags); | |
89eb8eb9 DN |
608 | } |
609 | ||
610 | xpc_kthread_waitmsgs(part, ch); | |
611 | } | |
612 | ||
a460ef8d | 613 | /* let registerer know that connection is disconnecting */ |
e54af724 | 614 | |
a460ef8d DN |
615 | spin_lock_irqsave(&ch->lock, irq_flags); |
616 | if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) && | |
35190506 | 617 | !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) { |
a460ef8d | 618 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT; |
4c2cd966 | 619 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
a460ef8d | 620 | |
65c17b80 | 621 | xpc_disconnect_callout(ch, xpDisconnecting); |
a460ef8d DN |
622 | |
623 | spin_lock_irqsave(&ch->lock, irq_flags); | |
624 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE; | |
625 | } | |
626 | spin_unlock_irqrestore(&ch->lock, irq_flags); | |
627 | ||
a47d5dac DN |
628 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
629 | atomic_dec_return(&part->nchannels_engaged) == 0) { | |
630 | xpc_indicate_partition_disengaged(part); | |
89eb8eb9 DN |
631 | } |
632 | ||
89eb8eb9 DN |
633 | xpc_msgqueue_deref(ch); |
634 | ||
635 | dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n", | |
636 | partid, ch_number); | |
637 | ||
638 | xpc_part_deref(part); | |
639 | return 0; | |
640 | } | |
641 | ||
89eb8eb9 DN |
642 | /* |
643 | * For each partition that XPC has established communications with, there is | |
644 | * a minimum of one kernel thread assigned to perform any operation that | |
645 | * may potentially sleep or block (basically the callouts to the asynchronous | |
646 | * functions registered via xpc_connect()). | |
647 | * | |
648 | * Additional kthreads are created and destroyed by XPC as the workload | |
649 | * demands. | |
650 | * | |
651 | * A kthread is assigned to one of the active channels that exists for a given | |
652 | * partition. | |
653 | */ | |
654 | void | |
a460ef8d | 655 | xpc_create_kthreads(struct xpc_channel *ch, int needed, |
35190506 | 656 | int ignore_disconnecting) |
89eb8eb9 DN |
657 | { |
658 | unsigned long irq_flags; | |
89eb8eb9 | 659 | u64 args = XPC_PACK_ARGS(ch->partid, ch->number); |
a607c389 | 660 | struct xpc_partition *part = &xpc_partitions[ch->partid]; |
2c2b94f9 | 661 | struct task_struct *kthread; |
89eb8eb9 | 662 | |
89eb8eb9 | 663 | while (needed-- > 0) { |
e54af724 DN |
664 | |
665 | /* | |
666 | * The following is done on behalf of the newly created | |
667 | * kthread. That kthread is responsible for doing the | |
668 | * counterpart to the following before it exits. | |
669 | */ | |
a460ef8d DN |
670 | if (ignore_disconnecting) { |
671 | if (!atomic_inc_not_zero(&ch->kthreads_assigned)) { | |
672 | /* kthreads assigned had gone to zero */ | |
673 | BUG_ON(!(ch->flags & | |
35190506 | 674 | XPC_C_DISCONNECTINGCALLOUT_MADE)); |
a460ef8d DN |
675 | break; |
676 | } | |
677 | ||
678 | } else if (ch->flags & XPC_C_DISCONNECTING) { | |
679 | break; | |
680 | ||
a47d5dac DN |
681 | } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 && |
682 | atomic_inc_return(&part->nchannels_engaged) == 1) { | |
683 | xpc_indicate_partition_engaged(part); | |
a460ef8d | 684 | } |
35190506 | 685 | (void)xpc_part_ref(part); |
e54af724 | 686 | xpc_msgqueue_ref(ch); |
e54af724 | 687 | |
2c2b94f9 DN |
688 | kthread = kthread_run(xpc_kthread_start, (void *)args, |
689 | "xpc%02dc%d", ch->partid, ch->number); | |
690 | if (IS_ERR(kthread)) { | |
89eb8eb9 | 691 | /* the fork failed */ |
a460ef8d DN |
692 | |
693 | /* | |
694 | * NOTE: if (ignore_disconnecting && | |
695 | * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true, | |
696 | * then we'll deadlock if all other kthreads assigned | |
697 | * to this channel are blocked in the channel's | |
698 | * registerer, because the only thing that will unblock | |
65c17b80 | 699 | * them is the xpDisconnecting callout that this |
2c2b94f9 | 700 | * failed kthread_run() would have made. |
a460ef8d DN |
701 | */ |
702 | ||
e54af724 DN |
703 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
704 | atomic_dec_return(&part->nchannels_engaged) == 0) { | |
a47d5dac | 705 | xpc_indicate_partition_disengaged(part); |
e54af724 DN |
706 | } |
707 | xpc_msgqueue_deref(ch); | |
708 | xpc_part_deref(part); | |
89eb8eb9 DN |
709 | |
710 | if (atomic_read(&ch->kthreads_assigned) < | |
35190506 | 711 | ch->kthreads_idle_limit) { |
89eb8eb9 DN |
712 | /* |
713 | * Flag this as an error only if we have an | |
714 | * insufficient #of kthreads for the channel | |
715 | * to function. | |
89eb8eb9 DN |
716 | */ |
717 | spin_lock_irqsave(&ch->lock, irq_flags); | |
65c17b80 | 718 | XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources, |
35190506 | 719 | &irq_flags); |
89eb8eb9 DN |
720 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
721 | } | |
722 | break; | |
723 | } | |
89eb8eb9 DN |
724 | } |
725 | } | |
726 | ||
89eb8eb9 DN |
727 | void |
728 | xpc_disconnect_wait(int ch_number) | |
729 | { | |
a607c389 | 730 | unsigned long irq_flags; |
64d032ba | 731 | short partid; |
89eb8eb9 DN |
732 | struct xpc_partition *part; |
733 | struct xpc_channel *ch; | |
e54af724 | 734 | int wakeup_channel_mgr; |
89eb8eb9 | 735 | |
89eb8eb9 | 736 | /* now wait for all callouts to the caller's function to cease */ |
bc63d387 | 737 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
89eb8eb9 DN |
738 | part = &xpc_partitions[partid]; |
739 | ||
2c2b94f9 | 740 | if (!xpc_part_ref(part)) |
e54af724 | 741 | continue; |
89eb8eb9 | 742 | |
e54af724 | 743 | ch = &part->channels[ch_number]; |
89eb8eb9 | 744 | |
e54af724 | 745 | if (!(ch->flags & XPC_C_WDISCONNECT)) { |
89eb8eb9 | 746 | xpc_part_deref(part); |
e54af724 | 747 | continue; |
89eb8eb9 | 748 | } |
e54af724 | 749 | |
f9e505a9 | 750 | wait_for_completion(&ch->wdisconnect_wait); |
e54af724 DN |
751 | |
752 | spin_lock_irqsave(&ch->lock, irq_flags); | |
753 | DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED)); | |
754 | wakeup_channel_mgr = 0; | |
755 | ||
756 | if (ch->delayed_IPI_flags) { | |
757 | if (part->act_state != XPC_P_DEACTIVATING) { | |
758 | spin_lock(&part->IPI_lock); | |
759 | XPC_SET_IPI_FLAGS(part->local_IPI_amo, | |
35190506 DN |
760 | ch->number, |
761 | ch->delayed_IPI_flags); | |
e54af724 DN |
762 | spin_unlock(&part->IPI_lock); |
763 | wakeup_channel_mgr = 1; | |
764 | } | |
765 | ch->delayed_IPI_flags = 0; | |
89eb8eb9 | 766 | } |
e54af724 DN |
767 | |
768 | ch->flags &= ~XPC_C_WDISCONNECT; | |
769 | spin_unlock_irqrestore(&ch->lock, irq_flags); | |
770 | ||
2c2b94f9 | 771 | if (wakeup_channel_mgr) |
e54af724 | 772 | xpc_wakeup_channel_mgr(part); |
e54af724 DN |
773 | |
774 | xpc_part_deref(part); | |
89eb8eb9 DN |
775 | } |
776 | } | |
777 | ||
89eb8eb9 | 778 | static void |
65c17b80 | 779 | xpc_do_exit(enum xp_retval reason) |
89eb8eb9 | 780 | { |
64d032ba | 781 | short partid; |
1ecaded8 | 782 | int active_part_count, printed_waiting_msg = 0; |
89eb8eb9 | 783 | struct xpc_partition *part; |
a47d5dac | 784 | unsigned long printmsg_time, disengage_timeout = 0; |
89eb8eb9 | 785 | |
a607c389 DN |
786 | /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */ |
787 | DBUG_ON(xpc_exiting == 1); | |
89eb8eb9 DN |
788 | |
789 | /* | |
a607c389 DN |
790 | * Let the heartbeat checker thread and the discovery thread |
791 | * (if one is running) know that they should exit. Also wake up | |
792 | * the heartbeat checker thread in case it's sleeping. | |
89eb8eb9 DN |
793 | */ |
794 | xpc_exiting = 1; | |
6e41017a | 795 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
89eb8eb9 | 796 | |
e54af724 | 797 | /* wait for the discovery thread to exit */ |
f9e505a9 | 798 | wait_for_completion(&xpc_discovery_exited); |
89eb8eb9 | 799 | |
e54af724 | 800 | /* wait for the heartbeat checker thread to exit */ |
f9e505a9 | 801 | wait_for_completion(&xpc_hb_checker_exited); |
89eb8eb9 | 802 | |
a607c389 | 803 | /* sleep for a 1/3 of a second or so */ |
35190506 | 804 | (void)msleep_interruptible(300); |
89eb8eb9 DN |
805 | |
806 | /* wait for all partitions to become inactive */ | |
807 | ||
a47d5dac DN |
808 | printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
809 | xpc_disengage_timedout = 0; | |
a607c389 | 810 | |
89eb8eb9 DN |
811 | do { |
812 | active_part_count = 0; | |
813 | ||
bc63d387 | 814 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
89eb8eb9 | 815 | part = &xpc_partitions[partid]; |
89eb8eb9 | 816 | |
a607c389 | 817 | if (xpc_partition_disengaged(part) && |
35190506 | 818 | part->act_state == XPC_P_INACTIVE) { |
a607c389 | 819 | continue; |
89eb8eb9 | 820 | } |
a607c389 DN |
821 | |
822 | active_part_count++; | |
823 | ||
824 | XPC_DEACTIVATE_PARTITION(part, reason); | |
89eb8eb9 | 825 | |
a47d5dac DN |
826 | if (part->disengage_timeout > disengage_timeout) |
827 | disengage_timeout = part->disengage_timeout; | |
a607c389 | 828 | } |
89eb8eb9 | 829 | |
a47d5dac | 830 | if (xpc_any_partition_engaged()) { |
aaa3cd69 | 831 | if (time_is_before_jiffies(printmsg_time)) { |
1ecaded8 | 832 | dev_info(xpc_part, "waiting for remote " |
a47d5dac DN |
833 | "partitions to deactivate, timeout in " |
834 | "%ld seconds\n", (disengage_timeout - | |
835 | jiffies) / HZ); | |
1ecaded8 | 836 | printmsg_time = jiffies + |
a47d5dac | 837 | (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
1ecaded8 DN |
838 | printed_waiting_msg = 1; |
839 | } | |
840 | ||
841 | } else if (active_part_count > 0) { | |
842 | if (printed_waiting_msg) { | |
843 | dev_info(xpc_part, "waiting for local partition" | |
a47d5dac | 844 | " to deactivate\n"); |
1ecaded8 DN |
845 | printed_waiting_msg = 0; |
846 | } | |
847 | ||
848 | } else { | |
a47d5dac | 849 | if (!xpc_disengage_timedout) { |
1ecaded8 | 850 | dev_info(xpc_part, "all partitions have " |
a47d5dac | 851 | "deactivated\n"); |
1ecaded8 DN |
852 | } |
853 | break; | |
89eb8eb9 DN |
854 | } |
855 | ||
a607c389 | 856 | /* sleep for a 1/3 of a second or so */ |
35190506 | 857 | (void)msleep_interruptible(300); |
a607c389 DN |
858 | |
859 | } while (1); | |
860 | ||
a47d5dac | 861 | DBUG_ON(xpc_any_partition_engaged()); |
33ba3c77 | 862 | DBUG_ON(xpc_any_hbs_allowed() != 0); |
a607c389 | 863 | |
a607c389 | 864 | /* indicate to others that our reserved page is uninitialized */ |
aaa3cd69 | 865 | xpc_rsvd_page->stamp = 0; |
a607c389 | 866 | |
65c17b80 | 867 | if (reason == xpUnloading) { |
35190506 | 868 | (void)unregister_die_notifier(&xpc_die_notifier); |
bc63d387 | 869 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); |
0752c670 | 870 | } |
780d09e8 | 871 | |
89eb8eb9 DN |
872 | /* clear the interface to XPC's functions */ |
873 | xpc_clear_interface(); | |
874 | ||
2c2b94f9 | 875 | if (xpc_sysctl) |
89eb8eb9 | 876 | unregister_sysctl_table(xpc_sysctl); |
7682a4c6 | 877 | |
bc63d387 | 878 | kfree(xpc_partitions); |
7682a4c6 | 879 | kfree(xpc_remote_copy_buffer_base); |
6e41017a DN |
880 | |
881 | if (is_shub()) | |
882 | xpc_exit_sn2(); | |
883 | else | |
884 | xpc_exit_uv(); | |
89eb8eb9 DN |
885 | } |
886 | ||
780d09e8 | 887 | /* |
d6ad033a DN |
888 | * This function is called when the system is being rebooted. |
889 | */ | |
890 | static int | |
891 | xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused) | |
892 | { | |
65c17b80 | 893 | enum xp_retval reason; |
d6ad033a | 894 | |
d6ad033a DN |
895 | switch (event) { |
896 | case SYS_RESTART: | |
65c17b80 | 897 | reason = xpSystemReboot; |
d6ad033a DN |
898 | break; |
899 | case SYS_HALT: | |
65c17b80 | 900 | reason = xpSystemHalt; |
d6ad033a DN |
901 | break; |
902 | case SYS_POWER_OFF: | |
65c17b80 | 903 | reason = xpSystemPoweroff; |
d6ad033a DN |
904 | break; |
905 | default: | |
65c17b80 | 906 | reason = xpSystemGoingDown; |
d6ad033a DN |
907 | } |
908 | ||
909 | xpc_do_exit(reason); | |
910 | return NOTIFY_DONE; | |
911 | } | |
912 | ||
d6ad033a | 913 | /* |
a47d5dac DN |
914 | * Notify other partitions to deactivate from us by first disengaging from all |
915 | * references to our memory. | |
780d09e8 DN |
916 | */ |
917 | static void | |
a47d5dac | 918 | xpc_die_deactivate(void) |
780d09e8 DN |
919 | { |
920 | struct xpc_partition *part; | |
64d032ba | 921 | short partid; |
a47d5dac DN |
922 | int any_engaged; |
923 | long time, printmsg_time, disengage_timeout; | |
780d09e8 | 924 | |
780d09e8 DN |
925 | /* keep xpc_hb_checker thread from doing anything (just in case) */ |
926 | xpc_exiting = 1; | |
927 | ||
33ba3c77 | 928 | xpc_disallow_all_hbs(); /*indicate we're deactivated */ |
780d09e8 | 929 | |
bc63d387 | 930 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
780d09e8 DN |
931 | part = &xpc_partitions[partid]; |
932 | ||
a47d5dac | 933 | if (xpc_partition_engaged(partid) || |
35190506 | 934 | part->act_state != XPC_P_INACTIVE) { |
a47d5dac DN |
935 | xpc_request_partition_deactivation(part); |
936 | xpc_indicate_partition_disengaged(part); | |
780d09e8 DN |
937 | } |
938 | } | |
939 | ||
1ecaded8 DN |
940 | time = rtc_time(); |
941 | printmsg_time = time + | |
a47d5dac DN |
942 | (XPC_DEACTIVATE_PRINTMSG_INTERVAL * sn_rtc_cycles_per_second); |
943 | disengage_timeout = time + | |
944 | (xpc_disengage_timelimit * sn_rtc_cycles_per_second); | |
780d09e8 | 945 | |
a47d5dac DN |
946 | /* |
947 | * Though we requested that all other partitions deactivate from us, | |
948 | * we only wait until they've all disengaged. | |
949 | */ | |
780d09e8 | 950 | |
1ecaded8 | 951 | while (1) { |
a47d5dac DN |
952 | any_engaged = xpc_any_partition_engaged(); |
953 | if (!any_engaged) { | |
954 | dev_info(xpc_part, "all partitions have deactivated\n"); | |
1ecaded8 DN |
955 | break; |
956 | } | |
780d09e8 | 957 | |
1ecaded8 | 958 | time = rtc_time(); |
a47d5dac | 959 | if (time >= disengage_timeout) { |
bc63d387 DN |
960 | for (partid = 0; partid < xp_max_npartitions; |
961 | partid++) { | |
a47d5dac DN |
962 | if (xpc_partition_engaged(partid)) { |
963 | dev_info(xpc_part, "deactivate from " | |
35190506 DN |
964 | "remote partition %d timed " |
965 | "out\n", partid); | |
1ecaded8 DN |
966 | } |
967 | } | |
968 | break; | |
969 | } | |
970 | ||
971 | if (time >= printmsg_time) { | |
780d09e8 | 972 | dev_info(xpc_part, "waiting for remote partitions to " |
a47d5dac DN |
973 | "deactivate, timeout in %ld seconds\n", |
974 | (disengage_timeout - time) / | |
35190506 | 975 | sn_rtc_cycles_per_second); |
1ecaded8 | 976 | printmsg_time = time + |
a47d5dac | 977 | (XPC_DEACTIVATE_PRINTMSG_INTERVAL * |
35190506 | 978 | sn_rtc_cycles_per_second); |
780d09e8 DN |
979 | } |
980 | } | |
780d09e8 DN |
981 | } |
982 | ||
780d09e8 | 983 | /* |
1f4674b2 DN |
984 | * This function is called when the system is being restarted or halted due |
985 | * to some sort of system failure. If this is the case we need to notify the | |
986 | * other partitions to disengage from all references to our memory. | |
987 | * This function can also be called when our heartbeater could be offlined | |
988 | * for a time. In this case we need to notify other partitions to not worry | |
989 | * about the lack of a heartbeat. | |
780d09e8 DN |
990 | */ |
991 | static int | |
992 | xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused) | |
993 | { | |
994 | switch (event) { | |
995 | case DIE_MACHINE_RESTART: | |
996 | case DIE_MACHINE_HALT: | |
a47d5dac | 997 | xpc_die_deactivate(); |
780d09e8 | 998 | break; |
1f4674b2 DN |
999 | |
1000 | case DIE_KDEBUG_ENTER: | |
1001 | /* Should lack of heartbeat be ignored by other partitions? */ | |
2c2b94f9 | 1002 | if (!xpc_kdebug_ignore) |
1f4674b2 | 1003 | break; |
2c2b94f9 | 1004 | |
1f4674b2 | 1005 | /* fall through */ |
780d09e8 DN |
1006 | case DIE_MCA_MONARCH_ENTER: |
1007 | case DIE_INIT_MONARCH_ENTER: | |
33ba3c77 | 1008 | xpc_offline_heartbeat(); |
780d09e8 | 1009 | break; |
1f4674b2 DN |
1010 | |
1011 | case DIE_KDEBUG_LEAVE: | |
1012 | /* Is lack of heartbeat being ignored by other partitions? */ | |
2c2b94f9 | 1013 | if (!xpc_kdebug_ignore) |
1f4674b2 | 1014 | break; |
2c2b94f9 | 1015 | |
1f4674b2 | 1016 | /* fall through */ |
780d09e8 DN |
1017 | case DIE_MCA_MONARCH_LEAVE: |
1018 | case DIE_INIT_MONARCH_LEAVE: | |
33ba3c77 | 1019 | xpc_online_heartbeat(); |
780d09e8 DN |
1020 | break; |
1021 | } | |
1022 | ||
1023 | return NOTIFY_DONE; | |
1024 | } | |
1025 | ||
89eb8eb9 DN |
1026 | int __init |
1027 | xpc_init(void) | |
1028 | { | |
1029 | int ret; | |
64d032ba | 1030 | short partid; |
89eb8eb9 | 1031 | struct xpc_partition *part; |
2c2b94f9 | 1032 | struct task_struct *kthread; |
7682a4c6 | 1033 | size_t buf_size; |
89eb8eb9 | 1034 | |
94bd2708 DN |
1035 | if (is_shub()) { |
1036 | /* | |
1037 | * The ia64-sn2 architecture supports at most 64 partitions. | |
1038 | * And the inability to unregister remote AMOs restricts us | |
1039 | * further to only support exactly 64 partitions on this | |
1040 | * architecture, no less. | |
1041 | */ | |
1042 | if (xp_max_npartitions != 64) | |
1043 | return -EINVAL; | |
1044 | ||
6e41017a DN |
1045 | ret = xpc_init_sn2(); |
1046 | if (ret != 0) | |
1047 | return ret; | |
94bd2708 DN |
1048 | |
1049 | } else if (is_uv()) { | |
1050 | xpc_init_uv(); | |
1051 | ||
1052 | } else { | |
408865ce | 1053 | return -ENODEV; |
94bd2708 | 1054 | } |
408865ce | 1055 | |
bc63d387 DN |
1056 | snprintf(xpc_part->bus_id, BUS_ID_SIZE, "part"); |
1057 | snprintf(xpc_chan->bus_id, BUS_ID_SIZE, "chan"); | |
1058 | ||
7682a4c6 | 1059 | buf_size = max(XPC_RP_VARS_SIZE, |
35190506 | 1060 | XPC_RP_HEADER_SIZE + XP_NASID_MASK_BYTES); |
7682a4c6 | 1061 | xpc_remote_copy_buffer = xpc_kmalloc_cacheline_aligned(buf_size, |
35190506 | 1062 | GFP_KERNEL, |
2c2b94f9 | 1063 | &xpc_remote_copy_buffer_base); |
bc63d387 DN |
1064 | if (xpc_remote_copy_buffer == NULL) { |
1065 | dev_err(xpc_part, "can't get memory for remote copy buffer\n"); | |
6e41017a DN |
1066 | ret = -ENOMEM; |
1067 | goto out_1; | |
bc63d387 | 1068 | } |
89eb8eb9 | 1069 | |
bc63d387 DN |
1070 | xpc_partitions = kzalloc(sizeof(struct xpc_partition) * |
1071 | xp_max_npartitions, GFP_KERNEL); | |
1072 | if (xpc_partitions == NULL) { | |
1073 | dev_err(xpc_part, "can't get memory for partition structure\n"); | |
1074 | ret = -ENOMEM; | |
6e41017a | 1075 | goto out_2; |
bc63d387 | 1076 | } |
89eb8eb9 DN |
1077 | |
1078 | /* | |
1079 | * The first few fields of each entry of xpc_partitions[] need to | |
1080 | * be initialized now so that calls to xpc_connect() and | |
1081 | * xpc_disconnect() can be made prior to the activation of any remote | |
1082 | * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE | |
1083 | * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING | |
1084 | * PARTITION HAS BEEN ACTIVATED. | |
1085 | */ | |
bc63d387 | 1086 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
89eb8eb9 DN |
1087 | part = &xpc_partitions[partid]; |
1088 | ||
35190506 | 1089 | DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part)); |
89eb8eb9 | 1090 | |
6e41017a | 1091 | part->activate_IRQ_rcvd = 0; |
89eb8eb9 DN |
1092 | spin_lock_init(&part->act_lock); |
1093 | part->act_state = XPC_P_INACTIVE; | |
1094 | XPC_SET_REASON(part, 0, 0); | |
a607c389 | 1095 | |
a47d5dac DN |
1096 | init_timer(&part->disengage_timer); |
1097 | part->disengage_timer.function = | |
1098 | xpc_timeout_partition_disengage; | |
1099 | part->disengage_timer.data = (unsigned long)part; | |
a607c389 | 1100 | |
89eb8eb9 DN |
1101 | part->setup_state = XPC_P_UNSET; |
1102 | init_waitqueue_head(&part->teardown_wq); | |
1103 | atomic_set(&part->references, 0); | |
1104 | } | |
1105 | ||
bc63d387 DN |
1106 | xpc_sysctl = register_sysctl_table(xpc_sys_dir); |
1107 | ||
89eb8eb9 DN |
1108 | /* |
1109 | * Fill the partition reserved page with the information needed by | |
1110 | * other partitions to discover we are alive and establish initial | |
1111 | * communications. | |
1112 | */ | |
94bd2708 | 1113 | xpc_rsvd_page = xpc_setup_rsvd_page(); |
89eb8eb9 | 1114 | if (xpc_rsvd_page == NULL) { |
bc63d387 DN |
1115 | dev_err(xpc_part, "can't setup our reserved page\n"); |
1116 | ret = -EBUSY; | |
1117 | goto out_3; | |
89eb8eb9 DN |
1118 | } |
1119 | ||
a607c389 DN |
1120 | /* add ourselves to the reboot_notifier_list */ |
1121 | ret = register_reboot_notifier(&xpc_reboot_notifier); | |
2c2b94f9 | 1122 | if (ret != 0) |
a607c389 | 1123 | dev_warn(xpc_part, "can't register reboot notifier\n"); |
a607c389 | 1124 | |
1eeb66a1 | 1125 | /* add ourselves to the die_notifier list */ |
780d09e8 | 1126 | ret = register_die_notifier(&xpc_die_notifier); |
2c2b94f9 | 1127 | if (ret != 0) |
780d09e8 | 1128 | dev_warn(xpc_part, "can't register die notifier\n"); |
780d09e8 | 1129 | |
89eb8eb9 DN |
1130 | /* |
1131 | * The real work-horse behind xpc. This processes incoming | |
1132 | * interrupts and monitors remote heartbeats. | |
1133 | */ | |
2c2b94f9 DN |
1134 | kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME); |
1135 | if (IS_ERR(kthread)) { | |
89eb8eb9 | 1136 | dev_err(xpc_part, "failed while forking hb check thread\n"); |
bc63d387 DN |
1137 | ret = -EBUSY; |
1138 | goto out_4; | |
89eb8eb9 DN |
1139 | } |
1140 | ||
89eb8eb9 DN |
1141 | /* |
1142 | * Startup a thread that will attempt to discover other partitions to | |
1143 | * activate based on info provided by SAL. This new thread is short | |
1144 | * lived and will exit once discovery is complete. | |
1145 | */ | |
2c2b94f9 DN |
1146 | kthread = kthread_run(xpc_initiate_discovery, NULL, |
1147 | XPC_DISCOVERY_THREAD_NAME); | |
1148 | if (IS_ERR(kthread)) { | |
89eb8eb9 DN |
1149 | dev_err(xpc_part, "failed while forking discovery thread\n"); |
1150 | ||
1151 | /* mark this new thread as a non-starter */ | |
f9e505a9 | 1152 | complete(&xpc_discovery_exited); |
89eb8eb9 | 1153 | |
65c17b80 | 1154 | xpc_do_exit(xpUnloading); |
89eb8eb9 DN |
1155 | return -EBUSY; |
1156 | } | |
1157 | ||
89eb8eb9 DN |
1158 | /* set the interface to point at XPC's functions */ |
1159 | xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect, | |
97bf1aa1 DN |
1160 | xpc_initiate_send, xpc_initiate_send_notify, |
1161 | xpc_initiate_received, xpc_initiate_partid_to_nasids); | |
89eb8eb9 DN |
1162 | |
1163 | return 0; | |
bc63d387 DN |
1164 | |
1165 | /* initialization was not successful */ | |
1166 | out_4: | |
1167 | /* indicate to others that our reserved page is uninitialized */ | |
aaa3cd69 | 1168 | xpc_rsvd_page->stamp = 0; |
94bd2708 | 1169 | |
bc63d387 DN |
1170 | (void)unregister_die_notifier(&xpc_die_notifier); |
1171 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); | |
1172 | out_3: | |
bc63d387 DN |
1173 | if (xpc_sysctl) |
1174 | unregister_sysctl_table(xpc_sysctl); | |
1175 | kfree(xpc_partitions); | |
6e41017a | 1176 | out_2: |
bc63d387 | 1177 | kfree(xpc_remote_copy_buffer_base); |
6e41017a DN |
1178 | out_1: |
1179 | if (is_shub()) | |
1180 | xpc_exit_sn2(); | |
1181 | else | |
1182 | xpc_exit_uv(); | |
bc63d387 | 1183 | return ret; |
89eb8eb9 | 1184 | } |
89eb8eb9 | 1185 | |
35190506 | 1186 | module_init(xpc_init); |
89eb8eb9 DN |
1187 | |
1188 | void __exit | |
1189 | xpc_exit(void) | |
1190 | { | |
65c17b80 | 1191 | xpc_do_exit(xpUnloading); |
89eb8eb9 | 1192 | } |
89eb8eb9 | 1193 | |
35190506 | 1194 | module_exit(xpc_exit); |
89eb8eb9 DN |
1195 | |
1196 | MODULE_AUTHOR("Silicon Graphics, Inc."); | |
1197 | MODULE_DESCRIPTION("Cross Partition Communication (XPC) support"); | |
1198 | MODULE_LICENSE("GPL"); | |
1199 | ||
1200 | module_param(xpc_hb_interval, int, 0); | |
1201 | MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between " | |
35190506 | 1202 | "heartbeat increments."); |
89eb8eb9 DN |
1203 | |
1204 | module_param(xpc_hb_check_interval, int, 0); | |
1205 | MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between " | |
35190506 | 1206 | "heartbeat checks."); |
89eb8eb9 | 1207 | |
a47d5dac DN |
1208 | module_param(xpc_disengage_timelimit, int, 0); |
1209 | MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait " | |
1210 | "for disengage to complete."); | |
e54af724 | 1211 | |
1f4674b2 DN |
1212 | module_param(xpc_kdebug_ignore, int, 0); |
1213 | MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by " | |
35190506 | 1214 | "other partitions when dropping into kdebug."); |