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 | * | |
7fb5e59d | 28 | * . Currently on sn2, we have no way to determine which nasid an IRQ |
c39838ce DN |
29 | * came from. Thus, xpc_send_IRQ_sn2() does a remote amo write |
30 | * followed by an IPI. The amo indicates where data is to be pulled | |
31 | * from, so after the IPI arrives, the remote partition checks the amo | |
32 | * word. The IPI can actually arrive before the amo however, so other | |
33 | * code must periodically check for this case. Also, remote amo | |
7fb5e59d DN |
34 | * operations do not reliably time out. Thus we do a remote PIO read |
35 | * solely to know whether the remote partition is down and whether we | |
36 | * should stop sending IPIs to it. This remote PIO read operation is | |
37 | * set up in a special nofault region so SAL knows to ignore (and | |
c39838ce | 38 | * cleanup) any errors due to the remote amo write, PIO read, and/or |
7fb5e59d | 39 | * PIO write operations. |
89eb8eb9 DN |
40 | * |
41 | * If/when new hardware solves this IPI problem, we should abandon | |
42 | * the current approach. | |
43 | * | |
44 | */ | |
45 | ||
89eb8eb9 | 46 | #include <linux/module.h> |
261f3b49 DN |
47 | #include <linux/sysctl.h> |
48 | #include <linux/device.h> | |
69913927 | 49 | #include <linux/delay.h> |
a607c389 | 50 | #include <linux/reboot.h> |
1eeb66a1 | 51 | #include <linux/kdebug.h> |
2c2b94f9 | 52 | #include <linux/kthread.h> |
45d9ca49 | 53 | #include "xpc.h" |
89eb8eb9 | 54 | |
89eb8eb9 DN |
55 | /* define two XPC debug device structures to be used with dev_dbg() et al */ |
56 | ||
57 | struct device_driver xpc_dbg_name = { | |
58 | .name = "xpc" | |
59 | }; | |
60 | ||
61 | struct device xpc_part_dbg_subname = { | |
bb0dc43e | 62 | .init_name = "", /* set to "part" at xpc_init() time */ |
89eb8eb9 DN |
63 | .driver = &xpc_dbg_name |
64 | }; | |
65 | ||
66 | struct device xpc_chan_dbg_subname = { | |
bb0dc43e | 67 | .init_name = "", /* set to "chan" at xpc_init() time */ |
89eb8eb9 DN |
68 | .driver = &xpc_dbg_name |
69 | }; | |
70 | ||
71 | struct device *xpc_part = &xpc_part_dbg_subname; | |
72 | struct device *xpc_chan = &xpc_chan_dbg_subname; | |
73 | ||
1f4674b2 DN |
74 | static int xpc_kdebug_ignore; |
75 | ||
89eb8eb9 DN |
76 | /* systune related variables for /proc/sys directories */ |
77 | ||
a607c389 DN |
78 | static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL; |
79 | static int xpc_hb_min_interval = 1; | |
80 | static int xpc_hb_max_interval = 10; | |
89eb8eb9 | 81 | |
a607c389 DN |
82 | static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL; |
83 | static int xpc_hb_check_min_interval = 10; | |
84 | static int xpc_hb_check_max_interval = 120; | |
89eb8eb9 | 85 | |
a47d5dac DN |
86 | int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT; |
87 | static int xpc_disengage_min_timelimit; /* = 0 */ | |
88 | static int xpc_disengage_max_timelimit = 120; | |
89eb8eb9 DN |
89 | |
90 | static ctl_table xpc_sys_xpc_hb_dir[] = { | |
91 | { | |
35190506 DN |
92 | .ctl_name = CTL_UNNUMBERED, |
93 | .procname = "hb_interval", | |
94 | .data = &xpc_hb_interval, | |
95 | .maxlen = sizeof(int), | |
96 | .mode = 0644, | |
97 | .proc_handler = &proc_dointvec_minmax, | |
98 | .strategy = &sysctl_intvec, | |
99 | .extra1 = &xpc_hb_min_interval, | |
100 | .extra2 = &xpc_hb_max_interval}, | |
89eb8eb9 | 101 | { |
35190506 DN |
102 | .ctl_name = CTL_UNNUMBERED, |
103 | .procname = "hb_check_interval", | |
104 | .data = &xpc_hb_check_interval, | |
105 | .maxlen = sizeof(int), | |
106 | .mode = 0644, | |
107 | .proc_handler = &proc_dointvec_minmax, | |
108 | .strategy = &sysctl_intvec, | |
109 | .extra1 = &xpc_hb_check_min_interval, | |
110 | .extra2 = &xpc_hb_check_max_interval}, | |
68cbf075 | 111 | {} |
89eb8eb9 DN |
112 | }; |
113 | static ctl_table xpc_sys_xpc_dir[] = { | |
114 | { | |
35190506 DN |
115 | .ctl_name = CTL_UNNUMBERED, |
116 | .procname = "hb", | |
117 | .mode = 0555, | |
118 | .child = xpc_sys_xpc_hb_dir}, | |
e54af724 | 119 | { |
35190506 | 120 | .ctl_name = CTL_UNNUMBERED, |
a47d5dac DN |
121 | .procname = "disengage_timelimit", |
122 | .data = &xpc_disengage_timelimit, | |
35190506 DN |
123 | .maxlen = sizeof(int), |
124 | .mode = 0644, | |
125 | .proc_handler = &proc_dointvec_minmax, | |
126 | .strategy = &sysctl_intvec, | |
a47d5dac DN |
127 | .extra1 = &xpc_disengage_min_timelimit, |
128 | .extra2 = &xpc_disengage_max_timelimit}, | |
68cbf075 | 129 | {} |
89eb8eb9 DN |
130 | }; |
131 | static ctl_table xpc_sys_dir[] = { | |
132 | { | |
35190506 DN |
133 | .ctl_name = CTL_UNNUMBERED, |
134 | .procname = "xpc", | |
135 | .mode = 0555, | |
136 | .child = xpc_sys_xpc_dir}, | |
68cbf075 | 137 | {} |
89eb8eb9 DN |
138 | }; |
139 | static struct ctl_table_header *xpc_sysctl; | |
140 | ||
a47d5dac DN |
141 | /* non-zero if any remote partition disengage was timed out */ |
142 | int xpc_disengage_timedout; | |
89eb8eb9 | 143 | |
5b8669df DN |
144 | /* #of activate IRQs received and not yet processed */ |
145 | int xpc_activate_IRQ_rcvd; | |
146 | DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock); | |
89eb8eb9 DN |
147 | |
148 | /* IRQ handler notifies this wait queue on receipt of an IRQ */ | |
6e41017a | 149 | DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq); |
89eb8eb9 DN |
150 | |
151 | static unsigned long xpc_hb_check_timeout; | |
33ba3c77 DN |
152 | static struct timer_list xpc_hb_timer; |
153 | void *xpc_heartbeating_to_mask; | |
89eb8eb9 | 154 | |
e54af724 | 155 | /* notification that the xpc_hb_checker thread has exited */ |
f9e505a9 | 156 | static DECLARE_COMPLETION(xpc_hb_checker_exited); |
89eb8eb9 | 157 | |
e54af724 | 158 | /* notification that the xpc_discovery thread has exited */ |
f9e505a9 | 159 | static DECLARE_COMPLETION(xpc_discovery_exited); |
89eb8eb9 | 160 | |
89eb8eb9 DN |
161 | static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *); |
162 | ||
a607c389 DN |
163 | static int xpc_system_reboot(struct notifier_block *, unsigned long, void *); |
164 | static struct notifier_block xpc_reboot_notifier = { | |
165 | .notifier_call = xpc_system_reboot, | |
166 | }; | |
167 | ||
780d09e8 DN |
168 | static int xpc_system_die(struct notifier_block *, unsigned long, void *); |
169 | static struct notifier_block xpc_die_notifier = { | |
170 | .notifier_call = xpc_system_die, | |
171 | }; | |
172 | ||
5b8669df | 173 | int (*xpc_setup_partitions_sn) (void); |
a812dcc3 DN |
174 | enum xp_retval (*xpc_get_partition_rsvd_page_pa) (void *buf, u64 *cookie, |
175 | unsigned long *rp_pa, | |
176 | size_t *len); | |
5b8669df | 177 | int (*xpc_setup_rsvd_page_sn) (struct xpc_rsvd_page *rp); |
33ba3c77 DN |
178 | void (*xpc_heartbeat_init) (void); |
179 | void (*xpc_heartbeat_exit) (void); | |
180 | void (*xpc_increment_heartbeat) (void); | |
181 | void (*xpc_offline_heartbeat) (void); | |
182 | void (*xpc_online_heartbeat) (void); | |
61deb86e | 183 | enum xp_retval (*xpc_get_remote_heartbeat) (struct xpc_partition *part); |
33ba3c77 | 184 | |
e17d416b | 185 | enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part); |
a47d5dac | 186 | void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *ch); |
7fb5e59d | 187 | u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *part); |
5b8669df DN |
188 | enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *ch); |
189 | void (*xpc_teardown_msg_structures) (struct xpc_channel *ch); | |
7fb5e59d | 190 | void (*xpc_process_msg_chctl_flags) (struct xpc_partition *part, int ch_number); |
bd3e64c1 DN |
191 | int (*xpc_n_of_deliverable_payloads) (struct xpc_channel *ch); |
192 | void *(*xpc_get_deliverable_payload) (struct xpc_channel *ch); | |
33ba3c77 | 193 | |
a47d5dac | 194 | void (*xpc_request_partition_activation) (struct xpc_rsvd_page *remote_rp, |
a812dcc3 DN |
195 | unsigned long remote_rp_pa, |
196 | int nasid); | |
a47d5dac DN |
197 | void (*xpc_request_partition_reactivation) (struct xpc_partition *part); |
198 | void (*xpc_request_partition_deactivation) (struct xpc_partition *part); | |
199 | void (*xpc_cancel_partition_deactivation_request) (struct xpc_partition *part); | |
33ba3c77 | 200 | |
5b8669df DN |
201 | void (*xpc_process_activate_IRQ_rcvd) (void); |
202 | enum xp_retval (*xpc_setup_ch_structures_sn) (struct xpc_partition *part); | |
203 | void (*xpc_teardown_ch_structures_sn) (struct xpc_partition *part); | |
e17d416b | 204 | |
a47d5dac DN |
205 | void (*xpc_indicate_partition_engaged) (struct xpc_partition *part); |
206 | int (*xpc_partition_engaged) (short partid); | |
207 | int (*xpc_any_partition_engaged) (void); | |
208 | void (*xpc_indicate_partition_disengaged) (struct xpc_partition *part); | |
209 | void (*xpc_assume_partition_disengaged) (short partid); | |
210 | ||
7fb5e59d | 211 | void (*xpc_send_chctl_closerequest) (struct xpc_channel *ch, |
a47d5dac | 212 | unsigned long *irq_flags); |
7fb5e59d DN |
213 | void (*xpc_send_chctl_closereply) (struct xpc_channel *ch, |
214 | unsigned long *irq_flags); | |
215 | void (*xpc_send_chctl_openrequest) (struct xpc_channel *ch, | |
a47d5dac | 216 | unsigned long *irq_flags); |
7fb5e59d DN |
217 | void (*xpc_send_chctl_openreply) (struct xpc_channel *ch, |
218 | unsigned long *irq_flags); | |
33ba3c77 | 219 | |
5b8669df DN |
220 | void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *ch, |
221 | unsigned long msgqueue_pa); | |
222 | ||
bd3e64c1 DN |
223 | enum xp_retval (*xpc_send_payload) (struct xpc_channel *ch, u32 flags, |
224 | void *payload, u16 payload_size, | |
225 | u8 notify_type, xpc_notify_func func, | |
226 | void *key); | |
227 | void (*xpc_received_payload) (struct xpc_channel *ch, void *payload); | |
94bd2708 | 228 | |
a607c389 | 229 | /* |
a47d5dac | 230 | * Timer function to enforce the timelimit on the partition disengage. |
a607c389 DN |
231 | */ |
232 | static void | |
a47d5dac | 233 | xpc_timeout_partition_disengage(unsigned long data) |
a607c389 | 234 | { |
35190506 | 235 | struct xpc_partition *part = (struct xpc_partition *)data; |
a607c389 | 236 | |
a47d5dac | 237 | DBUG_ON(time_is_after_jiffies(part->disengage_timeout)); |
a607c389 | 238 | |
35190506 | 239 | (void)xpc_partition_disengaged(part); |
a607c389 | 240 | |
a47d5dac DN |
241 | DBUG_ON(part->disengage_timeout != 0); |
242 | DBUG_ON(xpc_partition_engaged(XPC_PARTID(part))); | |
a607c389 DN |
243 | } |
244 | ||
89eb8eb9 DN |
245 | /* |
246 | * Timer to produce the heartbeat. The timer structures function is | |
247 | * already set when this is initially called. A tunable is used to | |
248 | * specify when the next timeout should occur. | |
249 | */ | |
250 | static void | |
251 | xpc_hb_beater(unsigned long dummy) | |
252 | { | |
33ba3c77 | 253 | xpc_increment_heartbeat(); |
89eb8eb9 | 254 | |
aaa3cd69 | 255 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) |
6e41017a | 256 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
89eb8eb9 DN |
257 | |
258 | xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ); | |
259 | add_timer(&xpc_hb_timer); | |
260 | } | |
261 | ||
33ba3c77 DN |
262 | static void |
263 | xpc_start_hb_beater(void) | |
264 | { | |
265 | xpc_heartbeat_init(); | |
266 | init_timer(&xpc_hb_timer); | |
267 | xpc_hb_timer.function = xpc_hb_beater; | |
268 | xpc_hb_beater(0); | |
269 | } | |
270 | ||
271 | static void | |
272 | xpc_stop_hb_beater(void) | |
273 | { | |
274 | del_timer_sync(&xpc_hb_timer); | |
275 | xpc_heartbeat_exit(); | |
276 | } | |
277 | ||
61deb86e DN |
278 | /* |
279 | * At periodic intervals, scan through all active partitions and ensure | |
280 | * their heartbeat is still active. If not, the partition is deactivated. | |
281 | */ | |
282 | static void | |
283 | xpc_check_remote_hb(void) | |
284 | { | |
285 | struct xpc_partition *part; | |
286 | short partid; | |
287 | enum xp_retval ret; | |
288 | ||
289 | for (partid = 0; partid < xp_max_npartitions; partid++) { | |
290 | ||
291 | if (xpc_exiting) | |
292 | break; | |
293 | ||
294 | if (partid == xp_partition_id) | |
295 | continue; | |
296 | ||
297 | part = &xpc_partitions[partid]; | |
298 | ||
83469b55 DN |
299 | if (part->act_state == XPC_P_AS_INACTIVE || |
300 | part->act_state == XPC_P_AS_DEACTIVATING) { | |
61deb86e DN |
301 | continue; |
302 | } | |
303 | ||
304 | ret = xpc_get_remote_heartbeat(part); | |
305 | if (ret != xpSuccess) | |
306 | XPC_DEACTIVATE_PARTITION(part, ret); | |
307 | } | |
308 | } | |
309 | ||
89eb8eb9 DN |
310 | /* |
311 | * This thread is responsible for nearly all of the partition | |
312 | * activation/deactivation. | |
313 | */ | |
314 | static int | |
315 | xpc_hb_checker(void *ignore) | |
316 | { | |
35190506 | 317 | int force_IRQ = 0; |
89eb8eb9 DN |
318 | |
319 | /* this thread was marked active by xpc_hb_init() */ | |
320 | ||
0bc3cc03 | 321 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(XPC_HB_CHECK_CPU)); |
89eb8eb9 | 322 | |
4c013f5c | 323 | /* set our heartbeating to other partitions into motion */ |
89eb8eb9 | 324 | xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ); |
33ba3c77 | 325 | xpc_start_hb_beater(); |
89eb8eb9 | 326 | |
2c2b94f9 | 327 | while (!xpc_exiting) { |
89eb8eb9 | 328 | |
89eb8eb9 DN |
329 | dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have " |
330 | "been received\n", | |
35190506 | 331 | (int)(xpc_hb_check_timeout - jiffies), |
5b8669df | 332 | xpc_activate_IRQ_rcvd); |
89eb8eb9 | 333 | |
89eb8eb9 | 334 | /* checking of remote heartbeats is skewed by IRQ handling */ |
aaa3cd69 | 335 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) { |
5b8669df DN |
336 | xpc_hb_check_timeout = jiffies + |
337 | (xpc_hb_check_interval * HZ); | |
338 | ||
89eb8eb9 DN |
339 | dev_dbg(xpc_part, "checking remote heartbeats\n"); |
340 | xpc_check_remote_hb(); | |
341 | ||
342 | /* | |
5b8669df DN |
343 | * On sn2 we need to periodically recheck to ensure no |
344 | * IRQ/amo pairs have been missed. | |
89eb8eb9 | 345 | */ |
5b8669df DN |
346 | if (is_shub()) |
347 | force_IRQ = 1; | |
89eb8eb9 DN |
348 | } |
349 | ||
a607c389 | 350 | /* check for outstanding IRQs */ |
5b8669df | 351 | if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) { |
89eb8eb9 | 352 | force_IRQ = 0; |
5b8669df DN |
353 | dev_dbg(xpc_part, "processing activate IRQs " |
354 | "received\n"); | |
355 | xpc_process_activate_IRQ_rcvd(); | |
89eb8eb9 | 356 | } |
a607c389 DN |
357 | |
358 | /* wait for IRQ or timeout */ | |
6e41017a | 359 | (void)wait_event_interruptible(xpc_activate_IRQ_wq, |
5b8669df | 360 | (time_is_before_eq_jiffies( |
aaa3cd69 | 361 | xpc_hb_check_timeout) || |
5b8669df | 362 | xpc_activate_IRQ_rcvd > 0 || |
2c2b94f9 | 363 | xpc_exiting)); |
89eb8eb9 DN |
364 | } |
365 | ||
33ba3c77 DN |
366 | xpc_stop_hb_beater(); |
367 | ||
89eb8eb9 DN |
368 | dev_dbg(xpc_part, "heartbeat checker is exiting\n"); |
369 | ||
e54af724 | 370 | /* mark this thread as having exited */ |
f9e505a9 | 371 | complete(&xpc_hb_checker_exited); |
89eb8eb9 DN |
372 | return 0; |
373 | } | |
374 | ||
89eb8eb9 DN |
375 | /* |
376 | * This thread will attempt to discover other partitions to activate | |
377 | * based on info provided by SAL. This new thread is short lived and | |
378 | * will exit once discovery is complete. | |
379 | */ | |
380 | static int | |
381 | xpc_initiate_discovery(void *ignore) | |
382 | { | |
89eb8eb9 DN |
383 | xpc_discovery(); |
384 | ||
385 | dev_dbg(xpc_part, "discovery thread is exiting\n"); | |
386 | ||
e54af724 | 387 | /* mark this thread as having exited */ |
f9e505a9 | 388 | complete(&xpc_discovery_exited); |
89eb8eb9 DN |
389 | return 0; |
390 | } | |
391 | ||
89eb8eb9 DN |
392 | /* |
393 | * The first kthread assigned to a newly activated partition is the one | |
e17d416b | 394 | * created by XPC HB with which it calls xpc_activating(). XPC hangs on to |
89eb8eb9 DN |
395 | * that kthread until the partition is brought down, at which time that kthread |
396 | * returns back to XPC HB. (The return of that kthread will signify to XPC HB | |
397 | * that XPC has dismantled all communication infrastructure for the associated | |
398 | * partition.) This kthread becomes the channel manager for that partition. | |
399 | * | |
400 | * Each active partition has a channel manager, who, besides connecting and | |
401 | * disconnecting channels, will ensure that each of the partition's connected | |
402 | * channels has the required number of assigned kthreads to get the work done. | |
403 | */ | |
404 | static void | |
405 | xpc_channel_mgr(struct xpc_partition *part) | |
406 | { | |
83469b55 | 407 | while (part->act_state != XPC_P_AS_DEACTIVATING || |
35190506 DN |
408 | atomic_read(&part->nchannels_active) > 0 || |
409 | !xpc_partition_disengaged(part)) { | |
89eb8eb9 | 410 | |
7fb5e59d | 411 | xpc_process_sent_chctl_flags(part); |
89eb8eb9 | 412 | |
89eb8eb9 DN |
413 | /* |
414 | * Wait until we've been requested to activate kthreads or | |
415 | * all of the channel's message queues have been torn down or | |
416 | * a signal is pending. | |
417 | * | |
418 | * The channel_mgr_requests is set to 1 after being awakened, | |
419 | * This is done to prevent the channel mgr from making one pass | |
420 | * through the loop for each request, since he will | |
421 | * be servicing all the requests in one pass. The reason it's | |
422 | * set to 1 instead of 0 is so that other kthreads will know | |
423 | * that the channel mgr is running and won't bother trying to | |
424 | * wake him up. | |
425 | */ | |
426 | atomic_dec(&part->channel_mgr_requests); | |
35190506 | 427 | (void)wait_event_interruptible(part->channel_mgr_wq, |
2c2b94f9 | 428 | (atomic_read(&part->channel_mgr_requests) > 0 || |
7fb5e59d | 429 | part->chctl.all_flags != 0 || |
83469b55 | 430 | (part->act_state == XPC_P_AS_DEACTIVATING && |
2c2b94f9 DN |
431 | atomic_read(&part->nchannels_active) == 0 && |
432 | xpc_partition_disengaged(part)))); | |
89eb8eb9 | 433 | atomic_set(&part->channel_mgr_requests, 1); |
89eb8eb9 DN |
434 | } |
435 | } | |
436 | ||
5b8669df DN |
437 | /* |
438 | * Guarantee that the kzalloc'd memory is cacheline aligned. | |
439 | */ | |
440 | void * | |
441 | xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base) | |
442 | { | |
443 | /* see if kzalloc will give us cachline aligned memory by default */ | |
444 | *base = kzalloc(size, flags); | |
445 | if (*base == NULL) | |
446 | return NULL; | |
447 | ||
448 | if ((u64)*base == L1_CACHE_ALIGN((u64)*base)) | |
449 | return *base; | |
450 | ||
451 | kfree(*base); | |
452 | ||
453 | /* nope, we'll have to do it ourselves */ | |
454 | *base = kzalloc(size + L1_CACHE_BYTES, flags); | |
455 | if (*base == NULL) | |
456 | return NULL; | |
457 | ||
458 | return (void *)L1_CACHE_ALIGN((u64)*base); | |
459 | } | |
460 | ||
461 | /* | |
462 | * Setup the channel structures necessary to support XPartition Communication | |
463 | * between the specified remote partition and the local one. | |
464 | */ | |
465 | static enum xp_retval | |
466 | xpc_setup_ch_structures(struct xpc_partition *part) | |
467 | { | |
468 | enum xp_retval ret; | |
469 | int ch_number; | |
470 | struct xpc_channel *ch; | |
471 | short partid = XPC_PARTID(part); | |
472 | ||
473 | /* | |
474 | * Allocate all of the channel structures as a contiguous chunk of | |
475 | * memory. | |
476 | */ | |
477 | DBUG_ON(part->channels != NULL); | |
478 | part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS, | |
479 | GFP_KERNEL); | |
480 | if (part->channels == NULL) { | |
481 | dev_err(xpc_chan, "can't get memory for channels\n"); | |
482 | return xpNoMemory; | |
483 | } | |
484 | ||
485 | /* allocate the remote open and close args */ | |
486 | ||
487 | part->remote_openclose_args = | |
488 | xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, | |
489 | GFP_KERNEL, &part-> | |
490 | remote_openclose_args_base); | |
491 | if (part->remote_openclose_args == NULL) { | |
492 | dev_err(xpc_chan, "can't get memory for remote connect args\n"); | |
493 | ret = xpNoMemory; | |
494 | goto out_1; | |
495 | } | |
496 | ||
497 | part->chctl.all_flags = 0; | |
498 | spin_lock_init(&part->chctl_lock); | |
499 | ||
500 | atomic_set(&part->channel_mgr_requests, 1); | |
501 | init_waitqueue_head(&part->channel_mgr_wq); | |
502 | ||
503 | part->nchannels = XPC_MAX_NCHANNELS; | |
504 | ||
505 | atomic_set(&part->nchannels_active, 0); | |
506 | atomic_set(&part->nchannels_engaged, 0); | |
507 | ||
508 | for (ch_number = 0; ch_number < part->nchannels; ch_number++) { | |
509 | ch = &part->channels[ch_number]; | |
510 | ||
511 | ch->partid = partid; | |
512 | ch->number = ch_number; | |
513 | ch->flags = XPC_C_DISCONNECTED; | |
514 | ||
515 | atomic_set(&ch->kthreads_assigned, 0); | |
516 | atomic_set(&ch->kthreads_idle, 0); | |
517 | atomic_set(&ch->kthreads_active, 0); | |
518 | ||
519 | atomic_set(&ch->references, 0); | |
520 | atomic_set(&ch->n_to_notify, 0); | |
521 | ||
522 | spin_lock_init(&ch->lock); | |
523 | init_completion(&ch->wdisconnect_wait); | |
524 | ||
525 | atomic_set(&ch->n_on_msg_allocate_wq, 0); | |
526 | init_waitqueue_head(&ch->msg_allocate_wq); | |
527 | init_waitqueue_head(&ch->idle_wq); | |
528 | } | |
529 | ||
530 | ret = xpc_setup_ch_structures_sn(part); | |
531 | if (ret != xpSuccess) | |
532 | goto out_2; | |
533 | ||
534 | /* | |
535 | * With the setting of the partition setup_state to XPC_P_SS_SETUP, | |
536 | * we're declaring that this partition is ready to go. | |
537 | */ | |
538 | part->setup_state = XPC_P_SS_SETUP; | |
539 | ||
540 | return xpSuccess; | |
541 | ||
542 | /* setup of ch structures failed */ | |
543 | out_2: | |
544 | kfree(part->remote_openclose_args_base); | |
545 | part->remote_openclose_args = NULL; | |
546 | out_1: | |
547 | kfree(part->channels); | |
548 | part->channels = NULL; | |
549 | return ret; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Teardown the channel structures necessary to support XPartition Communication | |
554 | * between the specified remote partition and the local one. | |
555 | */ | |
556 | static void | |
557 | xpc_teardown_ch_structures(struct xpc_partition *part) | |
558 | { | |
559 | DBUG_ON(atomic_read(&part->nchannels_engaged) != 0); | |
560 | DBUG_ON(atomic_read(&part->nchannels_active) != 0); | |
561 | ||
562 | /* | |
563 | * Make this partition inaccessible to local processes by marking it | |
564 | * as no longer setup. Then wait before proceeding with the teardown | |
565 | * until all existing references cease. | |
566 | */ | |
567 | DBUG_ON(part->setup_state != XPC_P_SS_SETUP); | |
568 | part->setup_state = XPC_P_SS_WTEARDOWN; | |
569 | ||
570 | wait_event(part->teardown_wq, (atomic_read(&part->references) == 0)); | |
571 | ||
572 | /* now we can begin tearing down the infrastructure */ | |
573 | ||
574 | xpc_teardown_ch_structures_sn(part); | |
575 | ||
576 | kfree(part->remote_openclose_args_base); | |
577 | part->remote_openclose_args = NULL; | |
578 | kfree(part->channels); | |
579 | part->channels = NULL; | |
580 | ||
581 | part->setup_state = XPC_P_SS_TORNDOWN; | |
582 | } | |
583 | ||
89eb8eb9 DN |
584 | /* |
585 | * When XPC HB determines that a partition has come up, it will create a new | |
586 | * kthread and that kthread will call this function to attempt to set up the | |
587 | * basic infrastructure used for Cross Partition Communication with the newly | |
588 | * upped partition. | |
589 | * | |
590 | * The kthread that was created by XPC HB and which setup the XPC | |
e17d416b DN |
591 | * infrastructure will remain assigned to the partition becoming the channel |
592 | * manager for that partition until the partition is deactivating, at which | |
593 | * time the kthread will teardown the XPC infrastructure and then exit. | |
89eb8eb9 | 594 | */ |
89eb8eb9 DN |
595 | static int |
596 | xpc_activating(void *__partid) | |
597 | { | |
64d032ba | 598 | short partid = (u64)__partid; |
89eb8eb9 DN |
599 | struct xpc_partition *part = &xpc_partitions[partid]; |
600 | unsigned long irq_flags; | |
89eb8eb9 | 601 | |
bc63d387 | 602 | DBUG_ON(partid < 0 || partid >= xp_max_npartitions); |
89eb8eb9 DN |
603 | |
604 | spin_lock_irqsave(&part->act_lock, irq_flags); | |
605 | ||
83469b55 DN |
606 | if (part->act_state == XPC_P_AS_DEACTIVATING) { |
607 | part->act_state = XPC_P_AS_INACTIVE; | |
89eb8eb9 DN |
608 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
609 | part->remote_rp_pa = 0; | |
610 | return 0; | |
611 | } | |
612 | ||
613 | /* indicate the thread is activating */ | |
83469b55 DN |
614 | DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ); |
615 | part->act_state = XPC_P_AS_ACTIVATING; | |
89eb8eb9 DN |
616 | |
617 | XPC_SET_REASON(part, 0, 0); | |
618 | spin_unlock_irqrestore(&part->act_lock, irq_flags); | |
619 | ||
e17d416b | 620 | dev_dbg(xpc_part, "activating partition %d\n", partid); |
89eb8eb9 | 621 | |
33ba3c77 | 622 | xpc_allow_hb(partid); |
89eb8eb9 | 623 | |
5b8669df | 624 | if (xpc_setup_ch_structures(part) == xpSuccess) { |
e17d416b DN |
625 | (void)xpc_part_ref(part); /* this will always succeed */ |
626 | ||
627 | if (xpc_make_first_contact(part) == xpSuccess) { | |
628 | xpc_mark_partition_active(part); | |
629 | xpc_channel_mgr(part); | |
630 | /* won't return until partition is deactivating */ | |
631 | } | |
632 | ||
633 | xpc_part_deref(part); | |
5b8669df | 634 | xpc_teardown_ch_structures(part); |
e17d416b | 635 | } |
89eb8eb9 | 636 | |
33ba3c77 | 637 | xpc_disallow_hb(partid); |
89eb8eb9 DN |
638 | xpc_mark_partition_inactive(part); |
639 | ||
65c17b80 | 640 | if (part->reason == xpReactivating) { |
89eb8eb9 | 641 | /* interrupting ourselves results in activating partition */ |
a47d5dac | 642 | xpc_request_partition_reactivation(part); |
89eb8eb9 DN |
643 | } |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
89eb8eb9 DN |
648 | void |
649 | xpc_activate_partition(struct xpc_partition *part) | |
650 | { | |
64d032ba | 651 | short partid = XPC_PARTID(part); |
89eb8eb9 | 652 | unsigned long irq_flags; |
2c2b94f9 | 653 | struct task_struct *kthread; |
89eb8eb9 | 654 | |
89eb8eb9 DN |
655 | spin_lock_irqsave(&part->act_lock, irq_flags); |
656 | ||
83469b55 | 657 | DBUG_ON(part->act_state != XPC_P_AS_INACTIVE); |
89eb8eb9 | 658 | |
83469b55 | 659 | part->act_state = XPC_P_AS_ACTIVATION_REQ; |
65c17b80 | 660 | XPC_SET_REASON(part, xpCloneKThread, __LINE__); |
89eb8eb9 DN |
661 | |
662 | spin_unlock_irqrestore(&part->act_lock, irq_flags); | |
7c6c6636 | 663 | |
2c2b94f9 DN |
664 | kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d", |
665 | partid); | |
666 | if (IS_ERR(kthread)) { | |
7c6c6636 | 667 | spin_lock_irqsave(&part->act_lock, irq_flags); |
83469b55 | 668 | part->act_state = XPC_P_AS_INACTIVE; |
65c17b80 | 669 | XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__); |
7c6c6636 RH |
670 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
671 | } | |
89eb8eb9 DN |
672 | } |
673 | ||
89eb8eb9 DN |
674 | void |
675 | xpc_activate_kthreads(struct xpc_channel *ch, int needed) | |
676 | { | |
677 | int idle = atomic_read(&ch->kthreads_idle); | |
678 | int assigned = atomic_read(&ch->kthreads_assigned); | |
679 | int wakeup; | |
680 | ||
89eb8eb9 DN |
681 | DBUG_ON(needed <= 0); |
682 | ||
683 | if (idle > 0) { | |
684 | wakeup = (needed > idle) ? idle : needed; | |
685 | needed -= wakeup; | |
686 | ||
687 | dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, " | |
688 | "channel=%d\n", wakeup, ch->partid, ch->number); | |
689 | ||
690 | /* only wakeup the requested number of kthreads */ | |
691 | wake_up_nr(&ch->idle_wq, wakeup); | |
692 | } | |
693 | ||
2c2b94f9 | 694 | if (needed <= 0) |
89eb8eb9 | 695 | return; |
89eb8eb9 DN |
696 | |
697 | if (needed + assigned > ch->kthreads_assigned_limit) { | |
698 | needed = ch->kthreads_assigned_limit - assigned; | |
2c2b94f9 | 699 | if (needed <= 0) |
89eb8eb9 | 700 | return; |
89eb8eb9 DN |
701 | } |
702 | ||
703 | dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n", | |
704 | needed, ch->partid, ch->number); | |
705 | ||
a460ef8d | 706 | xpc_create_kthreads(ch, needed, 0); |
89eb8eb9 DN |
707 | } |
708 | ||
89eb8eb9 DN |
709 | /* |
710 | * This function is where XPC's kthreads wait for messages to deliver. | |
711 | */ | |
712 | static void | |
713 | xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch) | |
714 | { | |
715 | do { | |
716 | /* deliver messages to their intended recipients */ | |
717 | ||
bd3e64c1 | 718 | while (xpc_n_of_deliverable_payloads(ch) > 0 && |
2c2b94f9 | 719 | !(ch->flags & XPC_C_DISCONNECTING)) { |
bd3e64c1 | 720 | xpc_deliver_payload(ch); |
89eb8eb9 DN |
721 | } |
722 | ||
723 | if (atomic_inc_return(&ch->kthreads_idle) > | |
35190506 | 724 | ch->kthreads_idle_limit) { |
89eb8eb9 DN |
725 | /* too many idle kthreads on this channel */ |
726 | atomic_dec(&ch->kthreads_idle); | |
727 | break; | |
728 | } | |
729 | ||
730 | dev_dbg(xpc_chan, "idle kthread calling " | |
731 | "wait_event_interruptible_exclusive()\n"); | |
732 | ||
35190506 | 733 | (void)wait_event_interruptible_exclusive(ch->idle_wq, |
bd3e64c1 | 734 | (xpc_n_of_deliverable_payloads(ch) > 0 || |
2c2b94f9 | 735 | (ch->flags & XPC_C_DISCONNECTING))); |
89eb8eb9 DN |
736 | |
737 | atomic_dec(&ch->kthreads_idle); | |
738 | ||
2c2b94f9 | 739 | } while (!(ch->flags & XPC_C_DISCONNECTING)); |
89eb8eb9 DN |
740 | } |
741 | ||
89eb8eb9 | 742 | static int |
2c2b94f9 | 743 | xpc_kthread_start(void *args) |
89eb8eb9 | 744 | { |
64d032ba | 745 | short partid = XPC_UNPACK_ARG1(args); |
89eb8eb9 DN |
746 | u16 ch_number = XPC_UNPACK_ARG2(args); |
747 | struct xpc_partition *part = &xpc_partitions[partid]; | |
748 | struct xpc_channel *ch; | |
749 | int n_needed; | |
e54af724 | 750 | unsigned long irq_flags; |
89eb8eb9 | 751 | |
89eb8eb9 DN |
752 | dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n", |
753 | partid, ch_number); | |
754 | ||
755 | ch = &part->channels[ch_number]; | |
756 | ||
757 | if (!(ch->flags & XPC_C_DISCONNECTING)) { | |
89eb8eb9 DN |
758 | |
759 | /* let registerer know that connection has been established */ | |
760 | ||
e54af724 | 761 | spin_lock_irqsave(&ch->lock, irq_flags); |
4c2cd966 DN |
762 | if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) { |
763 | ch->flags |= XPC_C_CONNECTEDCALLOUT; | |
e54af724 DN |
764 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
765 | ||
89eb8eb9 DN |
766 | xpc_connected_callout(ch); |
767 | ||
4c2cd966 DN |
768 | spin_lock_irqsave(&ch->lock, irq_flags); |
769 | ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE; | |
770 | spin_unlock_irqrestore(&ch->lock, irq_flags); | |
771 | ||
89eb8eb9 DN |
772 | /* |
773 | * It is possible that while the callout was being | |
774 | * made that the remote partition sent some messages. | |
775 | * If that is the case, we may need to activate | |
776 | * additional kthreads to help deliver them. We only | |
777 | * need one less than total #of messages to deliver. | |
778 | */ | |
bd3e64c1 | 779 | n_needed = xpc_n_of_deliverable_payloads(ch) - 1; |
2c2b94f9 | 780 | if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING)) |
89eb8eb9 | 781 | xpc_activate_kthreads(ch, n_needed); |
2c2b94f9 | 782 | |
e54af724 DN |
783 | } else { |
784 | spin_unlock_irqrestore(&ch->lock, irq_flags); | |
89eb8eb9 DN |
785 | } |
786 | ||
787 | xpc_kthread_waitmsgs(part, ch); | |
788 | } | |
789 | ||
a460ef8d | 790 | /* let registerer know that connection is disconnecting */ |
e54af724 | 791 | |
a460ef8d DN |
792 | spin_lock_irqsave(&ch->lock, irq_flags); |
793 | if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) && | |
35190506 | 794 | !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) { |
a460ef8d | 795 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT; |
4c2cd966 | 796 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
a460ef8d | 797 | |
65c17b80 | 798 | xpc_disconnect_callout(ch, xpDisconnecting); |
a460ef8d DN |
799 | |
800 | spin_lock_irqsave(&ch->lock, irq_flags); | |
801 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE; | |
802 | } | |
803 | spin_unlock_irqrestore(&ch->lock, irq_flags); | |
804 | ||
a47d5dac DN |
805 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
806 | atomic_dec_return(&part->nchannels_engaged) == 0) { | |
807 | xpc_indicate_partition_disengaged(part); | |
89eb8eb9 DN |
808 | } |
809 | ||
89eb8eb9 DN |
810 | xpc_msgqueue_deref(ch); |
811 | ||
812 | dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n", | |
813 | partid, ch_number); | |
814 | ||
815 | xpc_part_deref(part); | |
816 | return 0; | |
817 | } | |
818 | ||
89eb8eb9 DN |
819 | /* |
820 | * For each partition that XPC has established communications with, there is | |
821 | * a minimum of one kernel thread assigned to perform any operation that | |
822 | * may potentially sleep or block (basically the callouts to the asynchronous | |
823 | * functions registered via xpc_connect()). | |
824 | * | |
825 | * Additional kthreads are created and destroyed by XPC as the workload | |
826 | * demands. | |
827 | * | |
828 | * A kthread is assigned to one of the active channels that exists for a given | |
829 | * partition. | |
830 | */ | |
831 | void | |
a460ef8d | 832 | xpc_create_kthreads(struct xpc_channel *ch, int needed, |
35190506 | 833 | int ignore_disconnecting) |
89eb8eb9 DN |
834 | { |
835 | unsigned long irq_flags; | |
89eb8eb9 | 836 | u64 args = XPC_PACK_ARGS(ch->partid, ch->number); |
a607c389 | 837 | struct xpc_partition *part = &xpc_partitions[ch->partid]; |
2c2b94f9 | 838 | struct task_struct *kthread; |
89eb8eb9 | 839 | |
89eb8eb9 | 840 | while (needed-- > 0) { |
e54af724 DN |
841 | |
842 | /* | |
843 | * The following is done on behalf of the newly created | |
844 | * kthread. That kthread is responsible for doing the | |
845 | * counterpart to the following before it exits. | |
846 | */ | |
a460ef8d DN |
847 | if (ignore_disconnecting) { |
848 | if (!atomic_inc_not_zero(&ch->kthreads_assigned)) { | |
849 | /* kthreads assigned had gone to zero */ | |
850 | BUG_ON(!(ch->flags & | |
35190506 | 851 | XPC_C_DISCONNECTINGCALLOUT_MADE)); |
a460ef8d DN |
852 | break; |
853 | } | |
854 | ||
855 | } else if (ch->flags & XPC_C_DISCONNECTING) { | |
856 | break; | |
857 | ||
a47d5dac DN |
858 | } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 && |
859 | atomic_inc_return(&part->nchannels_engaged) == 1) { | |
860 | xpc_indicate_partition_engaged(part); | |
a460ef8d | 861 | } |
35190506 | 862 | (void)xpc_part_ref(part); |
e54af724 | 863 | xpc_msgqueue_ref(ch); |
e54af724 | 864 | |
2c2b94f9 DN |
865 | kthread = kthread_run(xpc_kthread_start, (void *)args, |
866 | "xpc%02dc%d", ch->partid, ch->number); | |
867 | if (IS_ERR(kthread)) { | |
89eb8eb9 | 868 | /* the fork failed */ |
a460ef8d DN |
869 | |
870 | /* | |
871 | * NOTE: if (ignore_disconnecting && | |
872 | * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true, | |
873 | * then we'll deadlock if all other kthreads assigned | |
874 | * to this channel are blocked in the channel's | |
875 | * registerer, because the only thing that will unblock | |
65c17b80 | 876 | * them is the xpDisconnecting callout that this |
2c2b94f9 | 877 | * failed kthread_run() would have made. |
a460ef8d DN |
878 | */ |
879 | ||
e54af724 DN |
880 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
881 | atomic_dec_return(&part->nchannels_engaged) == 0) { | |
a47d5dac | 882 | xpc_indicate_partition_disengaged(part); |
e54af724 DN |
883 | } |
884 | xpc_msgqueue_deref(ch); | |
885 | xpc_part_deref(part); | |
89eb8eb9 DN |
886 | |
887 | if (atomic_read(&ch->kthreads_assigned) < | |
35190506 | 888 | ch->kthreads_idle_limit) { |
89eb8eb9 DN |
889 | /* |
890 | * Flag this as an error only if we have an | |
891 | * insufficient #of kthreads for the channel | |
892 | * to function. | |
89eb8eb9 DN |
893 | */ |
894 | spin_lock_irqsave(&ch->lock, irq_flags); | |
65c17b80 | 895 | XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources, |
35190506 | 896 | &irq_flags); |
89eb8eb9 DN |
897 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
898 | } | |
899 | break; | |
900 | } | |
89eb8eb9 DN |
901 | } |
902 | } | |
903 | ||
89eb8eb9 DN |
904 | void |
905 | xpc_disconnect_wait(int ch_number) | |
906 | { | |
a607c389 | 907 | unsigned long irq_flags; |
64d032ba | 908 | short partid; |
89eb8eb9 DN |
909 | struct xpc_partition *part; |
910 | struct xpc_channel *ch; | |
e54af724 | 911 | int wakeup_channel_mgr; |
89eb8eb9 | 912 | |
89eb8eb9 | 913 | /* now wait for all callouts to the caller's function to cease */ |
bc63d387 | 914 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
89eb8eb9 DN |
915 | part = &xpc_partitions[partid]; |
916 | ||
2c2b94f9 | 917 | if (!xpc_part_ref(part)) |
e54af724 | 918 | continue; |
89eb8eb9 | 919 | |
e54af724 | 920 | ch = &part->channels[ch_number]; |
89eb8eb9 | 921 | |
e54af724 | 922 | if (!(ch->flags & XPC_C_WDISCONNECT)) { |
89eb8eb9 | 923 | xpc_part_deref(part); |
e54af724 | 924 | continue; |
89eb8eb9 | 925 | } |
e54af724 | 926 | |
f9e505a9 | 927 | wait_for_completion(&ch->wdisconnect_wait); |
e54af724 DN |
928 | |
929 | spin_lock_irqsave(&ch->lock, irq_flags); | |
930 | DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED)); | |
931 | wakeup_channel_mgr = 0; | |
932 | ||
7fb5e59d | 933 | if (ch->delayed_chctl_flags) { |
83469b55 | 934 | if (part->act_state != XPC_P_AS_DEACTIVATING) { |
7fb5e59d DN |
935 | spin_lock(&part->chctl_lock); |
936 | part->chctl.flags[ch->number] |= | |
937 | ch->delayed_chctl_flags; | |
938 | spin_unlock(&part->chctl_lock); | |
e54af724 DN |
939 | wakeup_channel_mgr = 1; |
940 | } | |
7fb5e59d | 941 | ch->delayed_chctl_flags = 0; |
89eb8eb9 | 942 | } |
e54af724 DN |
943 | |
944 | ch->flags &= ~XPC_C_WDISCONNECT; | |
945 | spin_unlock_irqrestore(&ch->lock, irq_flags); | |
946 | ||
2c2b94f9 | 947 | if (wakeup_channel_mgr) |
e54af724 | 948 | xpc_wakeup_channel_mgr(part); |
e54af724 DN |
949 | |
950 | xpc_part_deref(part); | |
89eb8eb9 DN |
951 | } |
952 | } | |
953 | ||
5b8669df DN |
954 | static int |
955 | xpc_setup_partitions(void) | |
956 | { | |
957 | short partid; | |
958 | struct xpc_partition *part; | |
959 | ||
960 | xpc_partitions = kzalloc(sizeof(struct xpc_partition) * | |
961 | xp_max_npartitions, GFP_KERNEL); | |
962 | if (xpc_partitions == NULL) { | |
963 | dev_err(xpc_part, "can't get memory for partition structure\n"); | |
964 | return -ENOMEM; | |
965 | } | |
966 | ||
967 | /* | |
968 | * The first few fields of each entry of xpc_partitions[] need to | |
969 | * be initialized now so that calls to xpc_connect() and | |
970 | * xpc_disconnect() can be made prior to the activation of any remote | |
971 | * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE | |
972 | * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING | |
973 | * PARTITION HAS BEEN ACTIVATED. | |
974 | */ | |
975 | for (partid = 0; partid < xp_max_npartitions; partid++) { | |
976 | part = &xpc_partitions[partid]; | |
977 | ||
978 | DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part)); | |
979 | ||
980 | part->activate_IRQ_rcvd = 0; | |
981 | spin_lock_init(&part->act_lock); | |
982 | part->act_state = XPC_P_AS_INACTIVE; | |
983 | XPC_SET_REASON(part, 0, 0); | |
984 | ||
985 | init_timer(&part->disengage_timer); | |
986 | part->disengage_timer.function = | |
987 | xpc_timeout_partition_disengage; | |
988 | part->disengage_timer.data = (unsigned long)part; | |
989 | ||
990 | part->setup_state = XPC_P_SS_UNSET; | |
991 | init_waitqueue_head(&part->teardown_wq); | |
992 | atomic_set(&part->references, 0); | |
993 | } | |
994 | ||
995 | return xpc_setup_partitions_sn(); | |
996 | } | |
997 | ||
998 | static void | |
999 | xpc_teardown_partitions(void) | |
1000 | { | |
1001 | kfree(xpc_partitions); | |
1002 | } | |
1003 | ||
89eb8eb9 | 1004 | static void |
65c17b80 | 1005 | xpc_do_exit(enum xp_retval reason) |
89eb8eb9 | 1006 | { |
64d032ba | 1007 | short partid; |
1ecaded8 | 1008 | int active_part_count, printed_waiting_msg = 0; |
89eb8eb9 | 1009 | struct xpc_partition *part; |
a47d5dac | 1010 | unsigned long printmsg_time, disengage_timeout = 0; |
89eb8eb9 | 1011 | |
a607c389 DN |
1012 | /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */ |
1013 | DBUG_ON(xpc_exiting == 1); | |
89eb8eb9 DN |
1014 | |
1015 | /* | |
a607c389 DN |
1016 | * Let the heartbeat checker thread and the discovery thread |
1017 | * (if one is running) know that they should exit. Also wake up | |
1018 | * the heartbeat checker thread in case it's sleeping. | |
89eb8eb9 DN |
1019 | */ |
1020 | xpc_exiting = 1; | |
6e41017a | 1021 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
89eb8eb9 | 1022 | |
e54af724 | 1023 | /* wait for the discovery thread to exit */ |
f9e505a9 | 1024 | wait_for_completion(&xpc_discovery_exited); |
89eb8eb9 | 1025 | |
e54af724 | 1026 | /* wait for the heartbeat checker thread to exit */ |
f9e505a9 | 1027 | wait_for_completion(&xpc_hb_checker_exited); |
89eb8eb9 | 1028 | |
a607c389 | 1029 | /* sleep for a 1/3 of a second or so */ |
35190506 | 1030 | (void)msleep_interruptible(300); |
89eb8eb9 DN |
1031 | |
1032 | /* wait for all partitions to become inactive */ | |
1033 | ||
a47d5dac DN |
1034 | printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
1035 | xpc_disengage_timedout = 0; | |
a607c389 | 1036 | |
89eb8eb9 DN |
1037 | do { |
1038 | active_part_count = 0; | |
1039 | ||
bc63d387 | 1040 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
89eb8eb9 | 1041 | part = &xpc_partitions[partid]; |
89eb8eb9 | 1042 | |
a607c389 | 1043 | if (xpc_partition_disengaged(part) && |
83469b55 | 1044 | part->act_state == XPC_P_AS_INACTIVE) { |
a607c389 | 1045 | continue; |
89eb8eb9 | 1046 | } |
a607c389 DN |
1047 | |
1048 | active_part_count++; | |
1049 | ||
1050 | XPC_DEACTIVATE_PARTITION(part, reason); | |
89eb8eb9 | 1051 | |
a47d5dac DN |
1052 | if (part->disengage_timeout > disengage_timeout) |
1053 | disengage_timeout = part->disengage_timeout; | |
a607c389 | 1054 | } |
89eb8eb9 | 1055 | |
a47d5dac | 1056 | if (xpc_any_partition_engaged()) { |
aaa3cd69 | 1057 | if (time_is_before_jiffies(printmsg_time)) { |
1ecaded8 | 1058 | dev_info(xpc_part, "waiting for remote " |
a47d5dac DN |
1059 | "partitions to deactivate, timeout in " |
1060 | "%ld seconds\n", (disengage_timeout - | |
1061 | jiffies) / HZ); | |
1ecaded8 | 1062 | printmsg_time = jiffies + |
a47d5dac | 1063 | (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
1ecaded8 DN |
1064 | printed_waiting_msg = 1; |
1065 | } | |
1066 | ||
1067 | } else if (active_part_count > 0) { | |
1068 | if (printed_waiting_msg) { | |
1069 | dev_info(xpc_part, "waiting for local partition" | |
a47d5dac | 1070 | " to deactivate\n"); |
1ecaded8 DN |
1071 | printed_waiting_msg = 0; |
1072 | } | |
1073 | ||
1074 | } else { | |
a47d5dac | 1075 | if (!xpc_disengage_timedout) { |
1ecaded8 | 1076 | dev_info(xpc_part, "all partitions have " |
a47d5dac | 1077 | "deactivated\n"); |
1ecaded8 DN |
1078 | } |
1079 | break; | |
89eb8eb9 DN |
1080 | } |
1081 | ||
a607c389 | 1082 | /* sleep for a 1/3 of a second or so */ |
35190506 | 1083 | (void)msleep_interruptible(300); |
a607c389 DN |
1084 | |
1085 | } while (1); | |
1086 | ||
a47d5dac | 1087 | DBUG_ON(xpc_any_partition_engaged()); |
33ba3c77 | 1088 | DBUG_ON(xpc_any_hbs_allowed() != 0); |
a607c389 | 1089 | |
5b8669df | 1090 | xpc_teardown_rsvd_page(); |
a607c389 | 1091 | |
65c17b80 | 1092 | if (reason == xpUnloading) { |
35190506 | 1093 | (void)unregister_die_notifier(&xpc_die_notifier); |
bc63d387 | 1094 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); |
0752c670 | 1095 | } |
780d09e8 | 1096 | |
89eb8eb9 DN |
1097 | /* clear the interface to XPC's functions */ |
1098 | xpc_clear_interface(); | |
1099 | ||
2c2b94f9 | 1100 | if (xpc_sysctl) |
89eb8eb9 | 1101 | unregister_sysctl_table(xpc_sysctl); |
7682a4c6 | 1102 | |
5b8669df | 1103 | xpc_teardown_partitions(); |
6e41017a DN |
1104 | |
1105 | if (is_shub()) | |
1106 | xpc_exit_sn2(); | |
b7f7b074 | 1107 | else if (is_uv()) |
6e41017a | 1108 | xpc_exit_uv(); |
89eb8eb9 DN |
1109 | } |
1110 | ||
780d09e8 | 1111 | /* |
d6ad033a DN |
1112 | * This function is called when the system is being rebooted. |
1113 | */ | |
1114 | static int | |
1115 | xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused) | |
1116 | { | |
65c17b80 | 1117 | enum xp_retval reason; |
d6ad033a | 1118 | |
d6ad033a DN |
1119 | switch (event) { |
1120 | case SYS_RESTART: | |
65c17b80 | 1121 | reason = xpSystemReboot; |
d6ad033a DN |
1122 | break; |
1123 | case SYS_HALT: | |
65c17b80 | 1124 | reason = xpSystemHalt; |
d6ad033a DN |
1125 | break; |
1126 | case SYS_POWER_OFF: | |
65c17b80 | 1127 | reason = xpSystemPoweroff; |
d6ad033a DN |
1128 | break; |
1129 | default: | |
65c17b80 | 1130 | reason = xpSystemGoingDown; |
d6ad033a DN |
1131 | } |
1132 | ||
1133 | xpc_do_exit(reason); | |
1134 | return NOTIFY_DONE; | |
1135 | } | |
1136 | ||
d6ad033a | 1137 | /* |
a47d5dac DN |
1138 | * Notify other partitions to deactivate from us by first disengaging from all |
1139 | * references to our memory. | |
780d09e8 DN |
1140 | */ |
1141 | static void | |
a47d5dac | 1142 | xpc_die_deactivate(void) |
780d09e8 DN |
1143 | { |
1144 | struct xpc_partition *part; | |
64d032ba | 1145 | short partid; |
a47d5dac | 1146 | int any_engaged; |
261f3b49 DN |
1147 | long keep_waiting; |
1148 | long wait_to_print; | |
780d09e8 | 1149 | |
780d09e8 DN |
1150 | /* keep xpc_hb_checker thread from doing anything (just in case) */ |
1151 | xpc_exiting = 1; | |
1152 | ||
33ba3c77 | 1153 | xpc_disallow_all_hbs(); /*indicate we're deactivated */ |
780d09e8 | 1154 | |
bc63d387 | 1155 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
780d09e8 DN |
1156 | part = &xpc_partitions[partid]; |
1157 | ||
a47d5dac | 1158 | if (xpc_partition_engaged(partid) || |
83469b55 | 1159 | part->act_state != XPC_P_AS_INACTIVE) { |
a47d5dac DN |
1160 | xpc_request_partition_deactivation(part); |
1161 | xpc_indicate_partition_disengaged(part); | |
780d09e8 DN |
1162 | } |
1163 | } | |
1164 | ||
a47d5dac DN |
1165 | /* |
1166 | * Though we requested that all other partitions deactivate from us, | |
261f3b49 DN |
1167 | * we only wait until they've all disengaged or we've reached the |
1168 | * defined timelimit. | |
1169 | * | |
1170 | * Given that one iteration through the following while-loop takes | |
1171 | * approximately 200 microseconds, calculate the #of loops to take | |
1172 | * before bailing and the #of loops before printing a waiting message. | |
a47d5dac | 1173 | */ |
261f3b49 DN |
1174 | keep_waiting = xpc_disengage_timelimit * 1000 * 5; |
1175 | wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5; | |
780d09e8 | 1176 | |
1ecaded8 | 1177 | while (1) { |
a47d5dac DN |
1178 | any_engaged = xpc_any_partition_engaged(); |
1179 | if (!any_engaged) { | |
1180 | dev_info(xpc_part, "all partitions have deactivated\n"); | |
1ecaded8 DN |
1181 | break; |
1182 | } | |
780d09e8 | 1183 | |
261f3b49 | 1184 | if (!keep_waiting--) { |
bc63d387 DN |
1185 | for (partid = 0; partid < xp_max_npartitions; |
1186 | partid++) { | |
a47d5dac DN |
1187 | if (xpc_partition_engaged(partid)) { |
1188 | dev_info(xpc_part, "deactivate from " | |
35190506 DN |
1189 | "remote partition %d timed " |
1190 | "out\n", partid); | |
1ecaded8 DN |
1191 | } |
1192 | } | |
1193 | break; | |
1194 | } | |
1195 | ||
261f3b49 | 1196 | if (!wait_to_print--) { |
780d09e8 | 1197 | dev_info(xpc_part, "waiting for remote partitions to " |
a47d5dac | 1198 | "deactivate, timeout in %ld seconds\n", |
261f3b49 DN |
1199 | keep_waiting / (1000 * 5)); |
1200 | wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * | |
1201 | 1000 * 5; | |
780d09e8 | 1202 | } |
261f3b49 DN |
1203 | |
1204 | udelay(200); | |
780d09e8 | 1205 | } |
780d09e8 DN |
1206 | } |
1207 | ||
780d09e8 | 1208 | /* |
1f4674b2 DN |
1209 | * This function is called when the system is being restarted or halted due |
1210 | * to some sort of system failure. If this is the case we need to notify the | |
1211 | * other partitions to disengage from all references to our memory. | |
1212 | * This function can also be called when our heartbeater could be offlined | |
1213 | * for a time. In this case we need to notify other partitions to not worry | |
1214 | * about the lack of a heartbeat. | |
780d09e8 DN |
1215 | */ |
1216 | static int | |
1217 | xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused) | |
1218 | { | |
261f3b49 | 1219 | #ifdef CONFIG_IA64 /* !!! temporary kludge */ |
780d09e8 DN |
1220 | switch (event) { |
1221 | case DIE_MACHINE_RESTART: | |
1222 | case DIE_MACHINE_HALT: | |
a47d5dac | 1223 | xpc_die_deactivate(); |
780d09e8 | 1224 | break; |
1f4674b2 DN |
1225 | |
1226 | case DIE_KDEBUG_ENTER: | |
1227 | /* Should lack of heartbeat be ignored by other partitions? */ | |
2c2b94f9 | 1228 | if (!xpc_kdebug_ignore) |
1f4674b2 | 1229 | break; |
2c2b94f9 | 1230 | |
1f4674b2 | 1231 | /* fall through */ |
780d09e8 DN |
1232 | case DIE_MCA_MONARCH_ENTER: |
1233 | case DIE_INIT_MONARCH_ENTER: | |
33ba3c77 | 1234 | xpc_offline_heartbeat(); |
780d09e8 | 1235 | break; |
1f4674b2 DN |
1236 | |
1237 | case DIE_KDEBUG_LEAVE: | |
1238 | /* Is lack of heartbeat being ignored by other partitions? */ | |
2c2b94f9 | 1239 | if (!xpc_kdebug_ignore) |
1f4674b2 | 1240 | break; |
2c2b94f9 | 1241 | |
1f4674b2 | 1242 | /* fall through */ |
780d09e8 DN |
1243 | case DIE_MCA_MONARCH_LEAVE: |
1244 | case DIE_INIT_MONARCH_LEAVE: | |
33ba3c77 | 1245 | xpc_online_heartbeat(); |
780d09e8 DN |
1246 | break; |
1247 | } | |
261f3b49 DN |
1248 | #else |
1249 | xpc_die_deactivate(); | |
1250 | #endif | |
780d09e8 DN |
1251 | |
1252 | return NOTIFY_DONE; | |
1253 | } | |
1254 | ||
89eb8eb9 DN |
1255 | int __init |
1256 | xpc_init(void) | |
1257 | { | |
1258 | int ret; | |
2c2b94f9 | 1259 | struct task_struct *kthread; |
ee6665e3 | 1260 | |
bb0dc43e KS |
1261 | dev_set_name(xpc_part, "part"); |
1262 | dev_set_name(xpc_chan, "chan"); | |
89eb8eb9 | 1263 | |
94bd2708 DN |
1264 | if (is_shub()) { |
1265 | /* | |
1266 | * The ia64-sn2 architecture supports at most 64 partitions. | |
c39838ce | 1267 | * And the inability to unregister remote amos restricts us |
94bd2708 DN |
1268 | * further to only support exactly 64 partitions on this |
1269 | * architecture, no less. | |
1270 | */ | |
5b8669df DN |
1271 | if (xp_max_npartitions != 64) { |
1272 | dev_err(xpc_part, "max #of partitions not set to 64\n"); | |
1273 | ret = -EINVAL; | |
1274 | } else { | |
1275 | ret = xpc_init_sn2(); | |
1276 | } | |
94bd2708 DN |
1277 | |
1278 | } else if (is_uv()) { | |
5b8669df | 1279 | ret = xpc_init_uv(); |
94bd2708 DN |
1280 | |
1281 | } else { | |
5b8669df | 1282 | ret = -ENODEV; |
94bd2708 | 1283 | } |
408865ce | 1284 | |
5b8669df DN |
1285 | if (ret != 0) |
1286 | return ret; | |
1287 | ||
1288 | ret = xpc_setup_partitions(); | |
1289 | if (ret != 0) { | |
bc63d387 | 1290 | dev_err(xpc_part, "can't get memory for partition structure\n"); |
ee6665e3 | 1291 | goto out_1; |
bc63d387 | 1292 | } |
89eb8eb9 | 1293 | |
bc63d387 DN |
1294 | xpc_sysctl = register_sysctl_table(xpc_sys_dir); |
1295 | ||
89eb8eb9 DN |
1296 | /* |
1297 | * Fill the partition reserved page with the information needed by | |
1298 | * other partitions to discover we are alive and establish initial | |
1299 | * communications. | |
1300 | */ | |
5b8669df DN |
1301 | ret = xpc_setup_rsvd_page(); |
1302 | if (ret != 0) { | |
bc63d387 | 1303 | dev_err(xpc_part, "can't setup our reserved page\n"); |
ee6665e3 | 1304 | goto out_2; |
89eb8eb9 DN |
1305 | } |
1306 | ||
a607c389 DN |
1307 | /* add ourselves to the reboot_notifier_list */ |
1308 | ret = register_reboot_notifier(&xpc_reboot_notifier); | |
2c2b94f9 | 1309 | if (ret != 0) |
a607c389 | 1310 | dev_warn(xpc_part, "can't register reboot notifier\n"); |
a607c389 | 1311 | |
1eeb66a1 | 1312 | /* add ourselves to the die_notifier list */ |
780d09e8 | 1313 | ret = register_die_notifier(&xpc_die_notifier); |
2c2b94f9 | 1314 | if (ret != 0) |
780d09e8 | 1315 | dev_warn(xpc_part, "can't register die notifier\n"); |
780d09e8 | 1316 | |
89eb8eb9 DN |
1317 | /* |
1318 | * The real work-horse behind xpc. This processes incoming | |
1319 | * interrupts and monitors remote heartbeats. | |
1320 | */ | |
2c2b94f9 DN |
1321 | kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME); |
1322 | if (IS_ERR(kthread)) { | |
89eb8eb9 | 1323 | dev_err(xpc_part, "failed while forking hb check thread\n"); |
bc63d387 | 1324 | ret = -EBUSY; |
ee6665e3 | 1325 | goto out_3; |
89eb8eb9 DN |
1326 | } |
1327 | ||
89eb8eb9 DN |
1328 | /* |
1329 | * Startup a thread that will attempt to discover other partitions to | |
1330 | * activate based on info provided by SAL. This new thread is short | |
1331 | * lived and will exit once discovery is complete. | |
1332 | */ | |
2c2b94f9 DN |
1333 | kthread = kthread_run(xpc_initiate_discovery, NULL, |
1334 | XPC_DISCOVERY_THREAD_NAME); | |
1335 | if (IS_ERR(kthread)) { | |
89eb8eb9 DN |
1336 | dev_err(xpc_part, "failed while forking discovery thread\n"); |
1337 | ||
1338 | /* mark this new thread as a non-starter */ | |
f9e505a9 | 1339 | complete(&xpc_discovery_exited); |
89eb8eb9 | 1340 | |
65c17b80 | 1341 | xpc_do_exit(xpUnloading); |
89eb8eb9 DN |
1342 | return -EBUSY; |
1343 | } | |
1344 | ||
89eb8eb9 DN |
1345 | /* set the interface to point at XPC's functions */ |
1346 | xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect, | |
97bf1aa1 DN |
1347 | xpc_initiate_send, xpc_initiate_send_notify, |
1348 | xpc_initiate_received, xpc_initiate_partid_to_nasids); | |
89eb8eb9 DN |
1349 | |
1350 | return 0; | |
bc63d387 DN |
1351 | |
1352 | /* initialization was not successful */ | |
ee6665e3 | 1353 | out_3: |
5b8669df | 1354 | xpc_teardown_rsvd_page(); |
94bd2708 | 1355 | |
bc63d387 DN |
1356 | (void)unregister_die_notifier(&xpc_die_notifier); |
1357 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); | |
ee6665e3 | 1358 | out_2: |
bc63d387 DN |
1359 | if (xpc_sysctl) |
1360 | unregister_sysctl_table(xpc_sysctl); | |
5b8669df DN |
1361 | |
1362 | xpc_teardown_partitions(); | |
6e41017a DN |
1363 | out_1: |
1364 | if (is_shub()) | |
1365 | xpc_exit_sn2(); | |
b7f7b074 | 1366 | else if (is_uv()) |
6e41017a | 1367 | xpc_exit_uv(); |
bc63d387 | 1368 | return ret; |
89eb8eb9 | 1369 | } |
89eb8eb9 | 1370 | |
35190506 | 1371 | module_init(xpc_init); |
89eb8eb9 DN |
1372 | |
1373 | void __exit | |
1374 | xpc_exit(void) | |
1375 | { | |
65c17b80 | 1376 | xpc_do_exit(xpUnloading); |
89eb8eb9 | 1377 | } |
89eb8eb9 | 1378 | |
35190506 | 1379 | module_exit(xpc_exit); |
89eb8eb9 DN |
1380 | |
1381 | MODULE_AUTHOR("Silicon Graphics, Inc."); | |
1382 | MODULE_DESCRIPTION("Cross Partition Communication (XPC) support"); | |
1383 | MODULE_LICENSE("GPL"); | |
1384 | ||
1385 | module_param(xpc_hb_interval, int, 0); | |
1386 | MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between " | |
35190506 | 1387 | "heartbeat increments."); |
89eb8eb9 DN |
1388 | |
1389 | module_param(xpc_hb_check_interval, int, 0); | |
1390 | MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between " | |
35190506 | 1391 | "heartbeat checks."); |
89eb8eb9 | 1392 | |
a47d5dac DN |
1393 | module_param(xpc_disengage_timelimit, int, 0); |
1394 | MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait " | |
1395 | "for disengage to complete."); | |
e54af724 | 1396 | |
1f4674b2 DN |
1397 | module_param(xpc_kdebug_ignore, int, 0); |
1398 | MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by " | |
35190506 | 1399 | "other partitions when dropping into kdebug."); |