blob: 6576170de9628ae9ab72fde2aace263248ad52de [file] [log] [blame]
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001/*
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 *
Dean Nelson45d9ca42008-04-22 14:46:56 -05006 * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
Dean Nelson89eb8eb2005-03-23 19:50:00 -07007 */
8
Dean Nelson89eb8eb2005-03-23 19:50:00 -07009/*
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 *
Dean Nelson7fb5e592008-07-29 22:34:10 -070028 * . Currently on sn2, we have no way to determine which nasid an IRQ
Dean Nelsonc39838c2008-07-29 22:34:11 -070029 * 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
Dean Nelson7fb5e592008-07-29 22:34:10 -070034 * 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
Dean Nelsonc39838c2008-07-29 22:34:11 -070038 * cleanup) any errors due to the remote amo write, PIO read, and/or
Dean Nelson7fb5e592008-07-29 22:34:10 -070039 * PIO write operations.
Dean Nelson89eb8eb2005-03-23 19:50:00 -070040 *
41 * If/when new hardware solves this IPI problem, we should abandon
42 * the current approach.
43 *
44 */
45
Dean Nelson89eb8eb2005-03-23 19:50:00 -070046#include <linux/module.h>
Dean Nelson261f3b42008-07-29 22:34:16 -070047#include <linux/sysctl.h>
48#include <linux/device.h>
Nishanth Aravamudan69913922005-07-08 17:10:00 -070049#include <linux/delay.h>
Dean Nelsona607c382005-09-01 14:01:37 -050050#include <linux/reboot.h>
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -070051#include <linux/kdebug.h>
Dean Nelson2c2b94f2008-04-22 14:50:17 -050052#include <linux/kthread.h>
Dean Nelson45d9ca42008-04-22 14:46:56 -050053#include "xpc.h"
Dean Nelson89eb8eb2005-03-23 19:50:00 -070054
Dean Nelson89eb8eb2005-03-23 19:50:00 -070055/* define two XPC debug device structures to be used with dev_dbg() et al */
56
57struct device_driver xpc_dbg_name = {
58 .name = "xpc"
59};
60
61struct device xpc_part_dbg_subname = {
Kay Sieversbb0dc432009-01-06 10:44:37 -080062 .init_name = "", /* set to "part" at xpc_init() time */
Dean Nelson89eb8eb2005-03-23 19:50:00 -070063 .driver = &xpc_dbg_name
64};
65
66struct device xpc_chan_dbg_subname = {
Kay Sieversbb0dc432009-01-06 10:44:37 -080067 .init_name = "", /* set to "chan" at xpc_init() time */
Dean Nelson89eb8eb2005-03-23 19:50:00 -070068 .driver = &xpc_dbg_name
69};
70
71struct device *xpc_part = &xpc_part_dbg_subname;
72struct device *xpc_chan = &xpc_chan_dbg_subname;
73
Dean Nelson1f4674b2006-01-10 11:08:00 -060074static int xpc_kdebug_ignore;
75
Dean Nelson89eb8eb2005-03-23 19:50:00 -070076/* systune related variables for /proc/sys directories */
77
Dean Nelsona607c382005-09-01 14:01:37 -050078static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
79static int xpc_hb_min_interval = 1;
80static int xpc_hb_max_interval = 10;
Dean Nelson89eb8eb2005-03-23 19:50:00 -070081
Dean Nelsona607c382005-09-01 14:01:37 -050082static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL;
83static int xpc_hb_check_min_interval = 10;
84static int xpc_hb_check_max_interval = 120;
Dean Nelson89eb8eb2005-03-23 19:50:00 -070085
Dean Nelsona47d5da2008-07-29 22:34:09 -070086int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT;
87static int xpc_disengage_min_timelimit; /* = 0 */
88static int xpc_disengage_max_timelimit = 120;
Dean Nelson89eb8eb2005-03-23 19:50:00 -070089
90static ctl_table xpc_sys_xpc_hb_dir[] = {
91 {
Dean Nelson35190502008-04-22 14:48:55 -050092 .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},
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700101 {
Dean Nelson35190502008-04-22 14:48:55 -0500102 .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},
Eric W. Biederman68cbf072007-02-14 00:33:41 -0800111 {}
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700112};
113static ctl_table xpc_sys_xpc_dir[] = {
114 {
Dean Nelson35190502008-04-22 14:48:55 -0500115 .ctl_name = CTL_UNNUMBERED,
116 .procname = "hb",
117 .mode = 0555,
118 .child = xpc_sys_xpc_hb_dir},
Dean Nelsone54af722005-10-25 14:07:43 -0500119 {
Dean Nelson35190502008-04-22 14:48:55 -0500120 .ctl_name = CTL_UNNUMBERED,
Dean Nelsona47d5da2008-07-29 22:34:09 -0700121 .procname = "disengage_timelimit",
122 .data = &xpc_disengage_timelimit,
Dean Nelson35190502008-04-22 14:48:55 -0500123 .maxlen = sizeof(int),
124 .mode = 0644,
125 .proc_handler = &proc_dointvec_minmax,
126 .strategy = &sysctl_intvec,
Dean Nelsona47d5da2008-07-29 22:34:09 -0700127 .extra1 = &xpc_disengage_min_timelimit,
128 .extra2 = &xpc_disengage_max_timelimit},
Eric W. Biederman68cbf072007-02-14 00:33:41 -0800129 {}
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700130};
131static ctl_table xpc_sys_dir[] = {
132 {
Dean Nelson35190502008-04-22 14:48:55 -0500133 .ctl_name = CTL_UNNUMBERED,
134 .procname = "xpc",
135 .mode = 0555,
136 .child = xpc_sys_xpc_dir},
Eric W. Biederman68cbf072007-02-14 00:33:41 -0800137 {}
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700138};
139static struct ctl_table_header *xpc_sysctl;
140
Dean Nelsona47d5da2008-07-29 22:34:09 -0700141/* non-zero if any remote partition disengage was timed out */
142int xpc_disengage_timedout;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700143
Dean Nelson5b8669d2008-07-29 22:34:18 -0700144/* #of activate IRQs received and not yet processed */
145int xpc_activate_IRQ_rcvd;
146DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700147
148/* IRQ handler notifies this wait queue on receipt of an IRQ */
Dean Nelson6e410172008-07-29 22:34:09 -0700149DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700150
151static unsigned long xpc_hb_check_timeout;
Dean Nelson33ba3c72008-07-29 22:34:07 -0700152static struct timer_list xpc_hb_timer;
153void *xpc_heartbeating_to_mask;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700154
Dean Nelsone54af722005-10-25 14:07:43 -0500155/* notification that the xpc_hb_checker thread has exited */
Jes Sorensenf9e505a2006-01-17 12:52:21 -0500156static DECLARE_COMPLETION(xpc_hb_checker_exited);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700157
Dean Nelsone54af722005-10-25 14:07:43 -0500158/* notification that the xpc_discovery thread has exited */
Jes Sorensenf9e505a2006-01-17 12:52:21 -0500159static DECLARE_COMPLETION(xpc_discovery_exited);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700160
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700161static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
162
Dean Nelsona607c382005-09-01 14:01:37 -0500163static int xpc_system_reboot(struct notifier_block *, unsigned long, void *);
164static struct notifier_block xpc_reboot_notifier = {
165 .notifier_call = xpc_system_reboot,
166};
167
Dean Nelson780d09e2005-11-09 14:41:57 -0600168static int xpc_system_die(struct notifier_block *, unsigned long, void *);
169static struct notifier_block xpc_die_notifier = {
170 .notifier_call = xpc_system_die,
171};
172
Dean Nelson5b8669d2008-07-29 22:34:18 -0700173int (*xpc_setup_partitions_sn) (void);
Dean Nelsona812dcc2008-07-29 22:34:16 -0700174enum xp_retval (*xpc_get_partition_rsvd_page_pa) (void *buf, u64 *cookie,
175 unsigned long *rp_pa,
176 size_t *len);
Dean Nelson5b8669d2008-07-29 22:34:18 -0700177int (*xpc_setup_rsvd_page_sn) (struct xpc_rsvd_page *rp);
Dean Nelson33ba3c72008-07-29 22:34:07 -0700178void (*xpc_heartbeat_init) (void);
179void (*xpc_heartbeat_exit) (void);
180void (*xpc_increment_heartbeat) (void);
181void (*xpc_offline_heartbeat) (void);
182void (*xpc_online_heartbeat) (void);
Dean Nelson61deb862008-07-29 22:34:17 -0700183enum xp_retval (*xpc_get_remote_heartbeat) (struct xpc_partition *part);
Dean Nelson33ba3c72008-07-29 22:34:07 -0700184
Dean Nelsone17d4162008-07-29 22:34:06 -0700185enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part);
Dean Nelsona47d5da2008-07-29 22:34:09 -0700186void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *ch);
Dean Nelson7fb5e592008-07-29 22:34:10 -0700187u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *part);
Dean Nelson5b8669d2008-07-29 22:34:18 -0700188enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *ch);
189void (*xpc_teardown_msg_structures) (struct xpc_channel *ch);
Dean Nelson7fb5e592008-07-29 22:34:10 -0700190void (*xpc_process_msg_chctl_flags) (struct xpc_partition *part, int ch_number);
Dean Nelsonbd3e64c2008-07-29 22:34:19 -0700191int (*xpc_n_of_deliverable_payloads) (struct xpc_channel *ch);
192void *(*xpc_get_deliverable_payload) (struct xpc_channel *ch);
Dean Nelson33ba3c72008-07-29 22:34:07 -0700193
Dean Nelsona47d5da2008-07-29 22:34:09 -0700194void (*xpc_request_partition_activation) (struct xpc_rsvd_page *remote_rp,
Dean Nelsona812dcc2008-07-29 22:34:16 -0700195 unsigned long remote_rp_pa,
196 int nasid);
Dean Nelsona47d5da2008-07-29 22:34:09 -0700197void (*xpc_request_partition_reactivation) (struct xpc_partition *part);
198void (*xpc_request_partition_deactivation) (struct xpc_partition *part);
199void (*xpc_cancel_partition_deactivation_request) (struct xpc_partition *part);
Dean Nelson33ba3c72008-07-29 22:34:07 -0700200
Dean Nelson5b8669d2008-07-29 22:34:18 -0700201void (*xpc_process_activate_IRQ_rcvd) (void);
202enum xp_retval (*xpc_setup_ch_structures_sn) (struct xpc_partition *part);
203void (*xpc_teardown_ch_structures_sn) (struct xpc_partition *part);
Dean Nelsone17d4162008-07-29 22:34:06 -0700204
Dean Nelsona47d5da2008-07-29 22:34:09 -0700205void (*xpc_indicate_partition_engaged) (struct xpc_partition *part);
206int (*xpc_partition_engaged) (short partid);
207int (*xpc_any_partition_engaged) (void);
208void (*xpc_indicate_partition_disengaged) (struct xpc_partition *part);
209void (*xpc_assume_partition_disengaged) (short partid);
Dean Nelson33ba3c72008-07-29 22:34:07 -0700210
Dean Nelson7fb5e592008-07-29 22:34:10 -0700211void (*xpc_send_chctl_closerequest) (struct xpc_channel *ch,
Dean Nelsona47d5da2008-07-29 22:34:09 -0700212 unsigned long *irq_flags);
Dean Nelson7fb5e592008-07-29 22:34:10 -0700213void (*xpc_send_chctl_closereply) (struct xpc_channel *ch,
214 unsigned long *irq_flags);
215void (*xpc_send_chctl_openrequest) (struct xpc_channel *ch,
Dean Nelsona47d5da2008-07-29 22:34:09 -0700216 unsigned long *irq_flags);
Dean Nelson7fb5e592008-07-29 22:34:10 -0700217void (*xpc_send_chctl_openreply) (struct xpc_channel *ch,
218 unsigned long *irq_flags);
Dean Nelson33ba3c72008-07-29 22:34:07 -0700219
Dean Nelson5b8669d2008-07-29 22:34:18 -0700220void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *ch,
221 unsigned long msgqueue_pa);
222
Dean Nelsonbd3e64c2008-07-29 22:34:19 -0700223enum 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);
227void (*xpc_received_payload) (struct xpc_channel *ch, void *payload);
Dean Nelson94bd2702008-07-29 22:34:05 -0700228
Dean Nelsona607c382005-09-01 14:01:37 -0500229/*
Dean Nelsona47d5da2008-07-29 22:34:09 -0700230 * Timer function to enforce the timelimit on the partition disengage.
Dean Nelsona607c382005-09-01 14:01:37 -0500231 */
232static void
Dean Nelsona47d5da2008-07-29 22:34:09 -0700233xpc_timeout_partition_disengage(unsigned long data)
Dean Nelsona607c382005-09-01 14:01:37 -0500234{
Dean Nelson35190502008-04-22 14:48:55 -0500235 struct xpc_partition *part = (struct xpc_partition *)data;
Dean Nelsona607c382005-09-01 14:01:37 -0500236
Dean Nelsona47d5da2008-07-29 22:34:09 -0700237 DBUG_ON(time_is_after_jiffies(part->disengage_timeout));
Dean Nelsona607c382005-09-01 14:01:37 -0500238
Dean Nelson35190502008-04-22 14:48:55 -0500239 (void)xpc_partition_disengaged(part);
Dean Nelsona607c382005-09-01 14:01:37 -0500240
Dean Nelsona47d5da2008-07-29 22:34:09 -0700241 DBUG_ON(part->disengage_timeout != 0);
242 DBUG_ON(xpc_partition_engaged(XPC_PARTID(part)));
Dean Nelsona607c382005-09-01 14:01:37 -0500243}
244
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700245/*
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700246 * 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 */
250static void
251xpc_hb_beater(unsigned long dummy)
252{
Dean Nelson33ba3c72008-07-29 22:34:07 -0700253 xpc_increment_heartbeat();
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700254
Dean Nelsonaaa3cd62008-07-29 22:34:07 -0700255 if (time_is_before_eq_jiffies(xpc_hb_check_timeout))
Dean Nelson6e410172008-07-29 22:34:09 -0700256 wake_up_interruptible(&xpc_activate_IRQ_wq);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700257
258 xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ);
259 add_timer(&xpc_hb_timer);
260}
261
Dean Nelson33ba3c72008-07-29 22:34:07 -0700262static void
263xpc_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
271static void
272xpc_stop_hb_beater(void)
273{
274 del_timer_sync(&xpc_hb_timer);
275 xpc_heartbeat_exit();
276}
277
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700278/*
Dean Nelson61deb862008-07-29 22:34:17 -0700279 * At periodic intervals, scan through all active partitions and ensure
280 * their heartbeat is still active. If not, the partition is deactivated.
281 */
282static void
283xpc_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
Dean Nelson83469b52008-07-29 22:34:18 -0700299 if (part->act_state == XPC_P_AS_INACTIVE ||
300 part->act_state == XPC_P_AS_DEACTIVATING) {
Dean Nelson61deb862008-07-29 22:34:17 -0700301 continue;
302 }
303
304 ret = xpc_get_remote_heartbeat(part);
305 if (ret != xpSuccess)
306 XPC_DEACTIVATE_PARTITION(part, ret);
307 }
308}
309
310/*
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700311 * This thread is responsible for nearly all of the partition
312 * activation/deactivation.
313 */
314static int
315xpc_hb_checker(void *ignore)
316{
Dean Nelson35190502008-04-22 14:48:55 -0500317 int force_IRQ = 0;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700318
319 /* this thread was marked active by xpc_hb_init() */
320
Rusty Russellf7df8ed2009-01-10 21:58:09 -0800321 set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU));
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700322
Dean Nelson4c013f52007-11-07 07:53:06 -0600323 /* set our heartbeating to other partitions into motion */
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700324 xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
Dean Nelson33ba3c72008-07-29 22:34:07 -0700325 xpc_start_hb_beater();
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700326
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500327 while (!xpc_exiting) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700328
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700329 dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
330 "been received\n",
Dean Nelson35190502008-04-22 14:48:55 -0500331 (int)(xpc_hb_check_timeout - jiffies),
Dean Nelson5b8669d2008-07-29 22:34:18 -0700332 xpc_activate_IRQ_rcvd);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700333
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700334 /* checking of remote heartbeats is skewed by IRQ handling */
Dean Nelsonaaa3cd62008-07-29 22:34:07 -0700335 if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) {
Dean Nelson5b8669d2008-07-29 22:34:18 -0700336 xpc_hb_check_timeout = jiffies +
337 (xpc_hb_check_interval * HZ);
338
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700339 dev_dbg(xpc_part, "checking remote heartbeats\n");
340 xpc_check_remote_hb();
341
342 /*
Dean Nelson5b8669d2008-07-29 22:34:18 -0700343 * On sn2 we need to periodically recheck to ensure no
344 * IRQ/amo pairs have been missed.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700345 */
Dean Nelson5b8669d2008-07-29 22:34:18 -0700346 if (is_shub())
347 force_IRQ = 1;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700348 }
349
Dean Nelsona607c382005-09-01 14:01:37 -0500350 /* check for outstanding IRQs */
Dean Nelson5b8669d2008-07-29 22:34:18 -0700351 if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700352 force_IRQ = 0;
Dean Nelson5b8669d2008-07-29 22:34:18 -0700353 dev_dbg(xpc_part, "processing activate IRQs "
354 "received\n");
355 xpc_process_activate_IRQ_rcvd();
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700356 }
Dean Nelsona607c382005-09-01 14:01:37 -0500357
358 /* wait for IRQ or timeout */
Dean Nelson6e410172008-07-29 22:34:09 -0700359 (void)wait_event_interruptible(xpc_activate_IRQ_wq,
Dean Nelson5b8669d2008-07-29 22:34:18 -0700360 (time_is_before_eq_jiffies(
Dean Nelsonaaa3cd62008-07-29 22:34:07 -0700361 xpc_hb_check_timeout) ||
Dean Nelson5b8669d2008-07-29 22:34:18 -0700362 xpc_activate_IRQ_rcvd > 0 ||
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500363 xpc_exiting));
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700364 }
365
Dean Nelson33ba3c72008-07-29 22:34:07 -0700366 xpc_stop_hb_beater();
367
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700368 dev_dbg(xpc_part, "heartbeat checker is exiting\n");
369
Dean Nelsone54af722005-10-25 14:07:43 -0500370 /* mark this thread as having exited */
Jes Sorensenf9e505a2006-01-17 12:52:21 -0500371 complete(&xpc_hb_checker_exited);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700372 return 0;
373}
374
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700375/*
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 */
380static int
381xpc_initiate_discovery(void *ignore)
382{
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700383 xpc_discovery();
384
385 dev_dbg(xpc_part, "discovery thread is exiting\n");
386
Dean Nelsone54af722005-10-25 14:07:43 -0500387 /* mark this thread as having exited */
Jes Sorensenf9e505a2006-01-17 12:52:21 -0500388 complete(&xpc_discovery_exited);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700389 return 0;
390}
391
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700392/*
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700393 * The first kthread assigned to a newly activated partition is the one
Dean Nelsone17d4162008-07-29 22:34:06 -0700394 * created by XPC HB with which it calls xpc_activating(). XPC hangs on to
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700395 * 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 */
404static void
405xpc_channel_mgr(struct xpc_partition *part)
406{
Dean Nelson83469b52008-07-29 22:34:18 -0700407 while (part->act_state != XPC_P_AS_DEACTIVATING ||
Dean Nelson35190502008-04-22 14:48:55 -0500408 atomic_read(&part->nchannels_active) > 0 ||
409 !xpc_partition_disengaged(part)) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700410
Dean Nelson7fb5e592008-07-29 22:34:10 -0700411 xpc_process_sent_chctl_flags(part);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700412
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700413 /*
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);
Dean Nelson35190502008-04-22 14:48:55 -0500427 (void)wait_event_interruptible(part->channel_mgr_wq,
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500428 (atomic_read(&part->channel_mgr_requests) > 0 ||
Dean Nelson7fb5e592008-07-29 22:34:10 -0700429 part->chctl.all_flags != 0 ||
Dean Nelson83469b52008-07-29 22:34:18 -0700430 (part->act_state == XPC_P_AS_DEACTIVATING &&
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500431 atomic_read(&part->nchannels_active) == 0 &&
432 xpc_partition_disengaged(part))));
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700433 atomic_set(&part->channel_mgr_requests, 1);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700434 }
435}
436
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700437/*
Dean Nelson5b8669d2008-07-29 22:34:18 -0700438 * Guarantee that the kzalloc'd memory is cacheline aligned.
439 */
440void *
441xpc_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 */
465static enum xp_retval
466xpc_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 */
543out_2:
544 kfree(part->remote_openclose_args_base);
545 part->remote_openclose_args = NULL;
546out_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 */
556static void
557xpc_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
584/*
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700585 * 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
Dean Nelsone17d4162008-07-29 22:34:06 -0700591 * 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.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700594 */
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700595static int
596xpc_activating(void *__partid)
597{
Dean Nelson64d032b2008-05-12 14:02:03 -0700598 short partid = (u64)__partid;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700599 struct xpc_partition *part = &xpc_partitions[partid];
600 unsigned long irq_flags;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700601
Dean Nelsonbc63d382008-07-29 22:34:04 -0700602 DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700603
604 spin_lock_irqsave(&part->act_lock, irq_flags);
605
Dean Nelson83469b52008-07-29 22:34:18 -0700606 if (part->act_state == XPC_P_AS_DEACTIVATING) {
607 part->act_state = XPC_P_AS_INACTIVE;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700608 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 */
Dean Nelson83469b52008-07-29 22:34:18 -0700614 DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ);
615 part->act_state = XPC_P_AS_ACTIVATING;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700616
617 XPC_SET_REASON(part, 0, 0);
618 spin_unlock_irqrestore(&part->act_lock, irq_flags);
619
Dean Nelsone17d4162008-07-29 22:34:06 -0700620 dev_dbg(xpc_part, "activating partition %d\n", partid);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700621
Dean Nelson33ba3c72008-07-29 22:34:07 -0700622 xpc_allow_hb(partid);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700623
Dean Nelson5b8669d2008-07-29 22:34:18 -0700624 if (xpc_setup_ch_structures(part) == xpSuccess) {
Dean Nelsone17d4162008-07-29 22:34:06 -0700625 (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);
Dean Nelson5b8669d2008-07-29 22:34:18 -0700634 xpc_teardown_ch_structures(part);
Dean Nelsone17d4162008-07-29 22:34:06 -0700635 }
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700636
Dean Nelson33ba3c72008-07-29 22:34:07 -0700637 xpc_disallow_hb(partid);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700638 xpc_mark_partition_inactive(part);
639
Dean Nelson65c17b82008-05-12 14:02:02 -0700640 if (part->reason == xpReactivating) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700641 /* interrupting ourselves results in activating partition */
Dean Nelsona47d5da2008-07-29 22:34:09 -0700642 xpc_request_partition_reactivation(part);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700643 }
644
645 return 0;
646}
647
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700648void
649xpc_activate_partition(struct xpc_partition *part)
650{
Dean Nelson64d032b2008-05-12 14:02:03 -0700651 short partid = XPC_PARTID(part);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700652 unsigned long irq_flags;
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500653 struct task_struct *kthread;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700654
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700655 spin_lock_irqsave(&part->act_lock, irq_flags);
656
Dean Nelson83469b52008-07-29 22:34:18 -0700657 DBUG_ON(part->act_state != XPC_P_AS_INACTIVE);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700658
Dean Nelson83469b52008-07-29 22:34:18 -0700659 part->act_state = XPC_P_AS_ACTIVATION_REQ;
Dean Nelson65c17b82008-05-12 14:02:02 -0700660 XPC_SET_REASON(part, xpCloneKThread, __LINE__);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700661
662 spin_unlock_irqrestore(&part->act_lock, irq_flags);
Robin Holt7c6c6632006-02-02 12:30:21 -0600663
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500664 kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d",
665 partid);
666 if (IS_ERR(kthread)) {
Robin Holt7c6c6632006-02-02 12:30:21 -0600667 spin_lock_irqsave(&part->act_lock, irq_flags);
Dean Nelson83469b52008-07-29 22:34:18 -0700668 part->act_state = XPC_P_AS_INACTIVE;
Dean Nelson65c17b82008-05-12 14:02:02 -0700669 XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__);
Robin Holt7c6c6632006-02-02 12:30:21 -0600670 spin_unlock_irqrestore(&part->act_lock, irq_flags);
671 }
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700672}
673
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700674void
675xpc_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
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700681 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
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500694 if (needed <= 0)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700695 return;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700696
697 if (needed + assigned > ch->kthreads_assigned_limit) {
698 needed = ch->kthreads_assigned_limit - assigned;
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500699 if (needed <= 0)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700700 return;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700701 }
702
703 dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
704 needed, ch->partid, ch->number);
705
Dean Nelsona460ef82006-11-22 08:25:00 -0600706 xpc_create_kthreads(ch, needed, 0);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700707}
708
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700709/*
710 * This function is where XPC's kthreads wait for messages to deliver.
711 */
712static void
713xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
714{
715 do {
716 /* deliver messages to their intended recipients */
717
Dean Nelsonbd3e64c2008-07-29 22:34:19 -0700718 while (xpc_n_of_deliverable_payloads(ch) > 0 &&
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500719 !(ch->flags & XPC_C_DISCONNECTING)) {
Dean Nelsonbd3e64c2008-07-29 22:34:19 -0700720 xpc_deliver_payload(ch);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700721 }
722
723 if (atomic_inc_return(&ch->kthreads_idle) >
Dean Nelson35190502008-04-22 14:48:55 -0500724 ch->kthreads_idle_limit) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700725 /* 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
Dean Nelson35190502008-04-22 14:48:55 -0500733 (void)wait_event_interruptible_exclusive(ch->idle_wq,
Dean Nelsonbd3e64c2008-07-29 22:34:19 -0700734 (xpc_n_of_deliverable_payloads(ch) > 0 ||
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500735 (ch->flags & XPC_C_DISCONNECTING)));
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700736
737 atomic_dec(&ch->kthreads_idle);
738
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500739 } while (!(ch->flags & XPC_C_DISCONNECTING));
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700740}
741
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700742static int
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500743xpc_kthread_start(void *args)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700744{
Dean Nelson64d032b2008-05-12 14:02:03 -0700745 short partid = XPC_UNPACK_ARG1(args);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700746 u16 ch_number = XPC_UNPACK_ARG2(args);
747 struct xpc_partition *part = &xpc_partitions[partid];
748 struct xpc_channel *ch;
749 int n_needed;
Dean Nelsone54af722005-10-25 14:07:43 -0500750 unsigned long irq_flags;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700751
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700752 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)) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700758
759 /* let registerer know that connection has been established */
760
Dean Nelsone54af722005-10-25 14:07:43 -0500761 spin_lock_irqsave(&ch->lock, irq_flags);
Dean Nelson4c2cd962006-02-15 08:02:21 -0600762 if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
763 ch->flags |= XPC_C_CONNECTEDCALLOUT;
Dean Nelsone54af722005-10-25 14:07:43 -0500764 spin_unlock_irqrestore(&ch->lock, irq_flags);
765
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700766 xpc_connected_callout(ch);
767
Dean Nelson4c2cd962006-02-15 08:02:21 -0600768 spin_lock_irqsave(&ch->lock, irq_flags);
769 ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
770 spin_unlock_irqrestore(&ch->lock, irq_flags);
771
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700772 /*
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 */
Dean Nelsonbd3e64c2008-07-29 22:34:19 -0700779 n_needed = xpc_n_of_deliverable_payloads(ch) - 1;
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500780 if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING))
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700781 xpc_activate_kthreads(ch, n_needed);
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500782
Dean Nelsone54af722005-10-25 14:07:43 -0500783 } else {
784 spin_unlock_irqrestore(&ch->lock, irq_flags);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700785 }
786
787 xpc_kthread_waitmsgs(part, ch);
788 }
789
Dean Nelsona460ef82006-11-22 08:25:00 -0600790 /* let registerer know that connection is disconnecting */
Dean Nelsone54af722005-10-25 14:07:43 -0500791
Dean Nelsona460ef82006-11-22 08:25:00 -0600792 spin_lock_irqsave(&ch->lock, irq_flags);
793 if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
Dean Nelson35190502008-04-22 14:48:55 -0500794 !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
Dean Nelsona460ef82006-11-22 08:25:00 -0600795 ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
Dean Nelson4c2cd962006-02-15 08:02:21 -0600796 spin_unlock_irqrestore(&ch->lock, irq_flags);
Dean Nelsona460ef82006-11-22 08:25:00 -0600797
Dean Nelson65c17b82008-05-12 14:02:02 -0700798 xpc_disconnect_callout(ch, xpDisconnecting);
Dean Nelsona460ef82006-11-22 08:25:00 -0600799
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
Dean Nelsona47d5da2008-07-29 22:34:09 -0700805 if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
806 atomic_dec_return(&part->nchannels_engaged) == 0) {
807 xpc_indicate_partition_disengaged(part);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700808 }
809
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700810 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
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700819/*
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 */
831void
Dean Nelsona460ef82006-11-22 08:25:00 -0600832xpc_create_kthreads(struct xpc_channel *ch, int needed,
Dean Nelson35190502008-04-22 14:48:55 -0500833 int ignore_disconnecting)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700834{
835 unsigned long irq_flags;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700836 u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
Dean Nelsona607c382005-09-01 14:01:37 -0500837 struct xpc_partition *part = &xpc_partitions[ch->partid];
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500838 struct task_struct *kthread;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700839
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700840 while (needed-- > 0) {
Dean Nelsone54af722005-10-25 14:07:43 -0500841
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 */
Dean Nelsona460ef82006-11-22 08:25:00 -0600847 if (ignore_disconnecting) {
848 if (!atomic_inc_not_zero(&ch->kthreads_assigned)) {
849 /* kthreads assigned had gone to zero */
850 BUG_ON(!(ch->flags &
Dean Nelson35190502008-04-22 14:48:55 -0500851 XPC_C_DISCONNECTINGCALLOUT_MADE));
Dean Nelsona460ef82006-11-22 08:25:00 -0600852 break;
853 }
854
855 } else if (ch->flags & XPC_C_DISCONNECTING) {
856 break;
857
Dean Nelsona47d5da2008-07-29 22:34:09 -0700858 } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 &&
859 atomic_inc_return(&part->nchannels_engaged) == 1) {
860 xpc_indicate_partition_engaged(part);
Dean Nelsona460ef82006-11-22 08:25:00 -0600861 }
Dean Nelson35190502008-04-22 14:48:55 -0500862 (void)xpc_part_ref(part);
Dean Nelsone54af722005-10-25 14:07:43 -0500863 xpc_msgqueue_ref(ch);
Dean Nelsone54af722005-10-25 14:07:43 -0500864
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500865 kthread = kthread_run(xpc_kthread_start, (void *)args,
866 "xpc%02dc%d", ch->partid, ch->number);
867 if (IS_ERR(kthread)) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700868 /* the fork failed */
Dean Nelsona460ef82006-11-22 08:25:00 -0600869
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
Dean Nelson65c17b82008-05-12 14:02:02 -0700876 * them is the xpDisconnecting callout that this
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500877 * failed kthread_run() would have made.
Dean Nelsona460ef82006-11-22 08:25:00 -0600878 */
879
Dean Nelsone54af722005-10-25 14:07:43 -0500880 if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
881 atomic_dec_return(&part->nchannels_engaged) == 0) {
Dean Nelsona47d5da2008-07-29 22:34:09 -0700882 xpc_indicate_partition_disengaged(part);
Dean Nelsone54af722005-10-25 14:07:43 -0500883 }
884 xpc_msgqueue_deref(ch);
885 xpc_part_deref(part);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700886
887 if (atomic_read(&ch->kthreads_assigned) <
Dean Nelson35190502008-04-22 14:48:55 -0500888 ch->kthreads_idle_limit) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700889 /*
890 * Flag this as an error only if we have an
891 * insufficient #of kthreads for the channel
892 * to function.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700893 */
894 spin_lock_irqsave(&ch->lock, irq_flags);
Dean Nelson65c17b82008-05-12 14:02:02 -0700895 XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources,
Dean Nelson35190502008-04-22 14:48:55 -0500896 &irq_flags);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700897 spin_unlock_irqrestore(&ch->lock, irq_flags);
898 }
899 break;
900 }
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700901 }
902}
903
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700904void
905xpc_disconnect_wait(int ch_number)
906{
Dean Nelsona607c382005-09-01 14:01:37 -0500907 unsigned long irq_flags;
Dean Nelson64d032b2008-05-12 14:02:03 -0700908 short partid;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700909 struct xpc_partition *part;
910 struct xpc_channel *ch;
Dean Nelsone54af722005-10-25 14:07:43 -0500911 int wakeup_channel_mgr;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700912
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700913 /* now wait for all callouts to the caller's function to cease */
Dean Nelsonbc63d382008-07-29 22:34:04 -0700914 for (partid = 0; partid < xp_max_npartitions; partid++) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700915 part = &xpc_partitions[partid];
916
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500917 if (!xpc_part_ref(part))
Dean Nelsone54af722005-10-25 14:07:43 -0500918 continue;
Dean Nelsone54af722005-10-25 14:07:43 -0500919
920 ch = &part->channels[ch_number];
921
922 if (!(ch->flags & XPC_C_WDISCONNECT)) {
923 xpc_part_deref(part);
924 continue;
925 }
926
Jes Sorensenf9e505a2006-01-17 12:52:21 -0500927 wait_for_completion(&ch->wdisconnect_wait);
Dean Nelsone54af722005-10-25 14:07:43 -0500928
929 spin_lock_irqsave(&ch->lock, irq_flags);
930 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
931 wakeup_channel_mgr = 0;
932
Dean Nelson7fb5e592008-07-29 22:34:10 -0700933 if (ch->delayed_chctl_flags) {
Dean Nelson83469b52008-07-29 22:34:18 -0700934 if (part->act_state != XPC_P_AS_DEACTIVATING) {
Dean Nelson7fb5e592008-07-29 22:34:10 -0700935 spin_lock(&part->chctl_lock);
936 part->chctl.flags[ch->number] |=
937 ch->delayed_chctl_flags;
938 spin_unlock(&part->chctl_lock);
Dean Nelsone54af722005-10-25 14:07:43 -0500939 wakeup_channel_mgr = 1;
940 }
Dean Nelson7fb5e592008-07-29 22:34:10 -0700941 ch->delayed_chctl_flags = 0;
Dean Nelsone54af722005-10-25 14:07:43 -0500942 }
943
944 ch->flags &= ~XPC_C_WDISCONNECT;
945 spin_unlock_irqrestore(&ch->lock, irq_flags);
946
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500947 if (wakeup_channel_mgr)
Dean Nelsone54af722005-10-25 14:07:43 -0500948 xpc_wakeup_channel_mgr(part);
Dean Nelsone54af722005-10-25 14:07:43 -0500949
950 xpc_part_deref(part);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700951 }
952}
953
Dean Nelson5b8669d2008-07-29 22:34:18 -0700954static int
955xpc_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
998static void
999xpc_teardown_partitions(void)
1000{
1001 kfree(xpc_partitions);
1002}
1003
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001004static void
Dean Nelson65c17b82008-05-12 14:02:02 -07001005xpc_do_exit(enum xp_retval reason)
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001006{
Dean Nelson64d032b2008-05-12 14:02:03 -07001007 short partid;
Dean Nelson1ecaded2006-01-06 09:48:21 -06001008 int active_part_count, printed_waiting_msg = 0;
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001009 struct xpc_partition *part;
Dean Nelsona47d5da2008-07-29 22:34:09 -07001010 unsigned long printmsg_time, disengage_timeout = 0;
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001011
Dean Nelsona607c382005-09-01 14:01:37 -05001012 /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */
1013 DBUG_ON(xpc_exiting == 1);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001014
1015 /*
Dean Nelsona607c382005-09-01 14:01:37 -05001016 * 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.
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001019 */
1020 xpc_exiting = 1;
Dean Nelson6e410172008-07-29 22:34:09 -07001021 wake_up_interruptible(&xpc_activate_IRQ_wq);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001022
Dean Nelsone54af722005-10-25 14:07:43 -05001023 /* wait for the discovery thread to exit */
Jes Sorensenf9e505a2006-01-17 12:52:21 -05001024 wait_for_completion(&xpc_discovery_exited);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001025
Dean Nelsone54af722005-10-25 14:07:43 -05001026 /* wait for the heartbeat checker thread to exit */
Jes Sorensenf9e505a2006-01-17 12:52:21 -05001027 wait_for_completion(&xpc_hb_checker_exited);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001028
Dean Nelsona607c382005-09-01 14:01:37 -05001029 /* sleep for a 1/3 of a second or so */
Dean Nelson35190502008-04-22 14:48:55 -05001030 (void)msleep_interruptible(300);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001031
1032 /* wait for all partitions to become inactive */
1033
Dean Nelsona47d5da2008-07-29 22:34:09 -07001034 printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
1035 xpc_disengage_timedout = 0;
Dean Nelsona607c382005-09-01 14:01:37 -05001036
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001037 do {
1038 active_part_count = 0;
1039
Dean Nelsonbc63d382008-07-29 22:34:04 -07001040 for (partid = 0; partid < xp_max_npartitions; partid++) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001041 part = &xpc_partitions[partid];
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001042
Dean Nelsona607c382005-09-01 14:01:37 -05001043 if (xpc_partition_disengaged(part) &&
Dean Nelson83469b52008-07-29 22:34:18 -07001044 part->act_state == XPC_P_AS_INACTIVE) {
Dean Nelsona607c382005-09-01 14:01:37 -05001045 continue;
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001046 }
Dean Nelsona607c382005-09-01 14:01:37 -05001047
1048 active_part_count++;
1049
1050 XPC_DEACTIVATE_PARTITION(part, reason);
Dean Nelson1ecaded2006-01-06 09:48:21 -06001051
Dean Nelsona47d5da2008-07-29 22:34:09 -07001052 if (part->disengage_timeout > disengage_timeout)
1053 disengage_timeout = part->disengage_timeout;
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001054 }
1055
Dean Nelsona47d5da2008-07-29 22:34:09 -07001056 if (xpc_any_partition_engaged()) {
Dean Nelsonaaa3cd62008-07-29 22:34:07 -07001057 if (time_is_before_jiffies(printmsg_time)) {
Dean Nelson1ecaded2006-01-06 09:48:21 -06001058 dev_info(xpc_part, "waiting for remote "
Dean Nelsona47d5da2008-07-29 22:34:09 -07001059 "partitions to deactivate, timeout in "
1060 "%ld seconds\n", (disengage_timeout -
1061 jiffies) / HZ);
Dean Nelson1ecaded2006-01-06 09:48:21 -06001062 printmsg_time = jiffies +
Dean Nelsona47d5da2008-07-29 22:34:09 -07001063 (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
Dean Nelson1ecaded2006-01-06 09:48:21 -06001064 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"
Dean Nelsona47d5da2008-07-29 22:34:09 -07001070 " to deactivate\n");
Dean Nelson1ecaded2006-01-06 09:48:21 -06001071 printed_waiting_msg = 0;
1072 }
1073
1074 } else {
Dean Nelsona47d5da2008-07-29 22:34:09 -07001075 if (!xpc_disengage_timedout) {
Dean Nelson1ecaded2006-01-06 09:48:21 -06001076 dev_info(xpc_part, "all partitions have "
Dean Nelsona47d5da2008-07-29 22:34:09 -07001077 "deactivated\n");
Dean Nelson1ecaded2006-01-06 09:48:21 -06001078 }
1079 break;
Dean Nelsona607c382005-09-01 14:01:37 -05001080 }
1081
1082 /* sleep for a 1/3 of a second or so */
Dean Nelson35190502008-04-22 14:48:55 -05001083 (void)msleep_interruptible(300);
Dean Nelsona607c382005-09-01 14:01:37 -05001084
1085 } while (1);
1086
Dean Nelsona47d5da2008-07-29 22:34:09 -07001087 DBUG_ON(xpc_any_partition_engaged());
Dean Nelson33ba3c72008-07-29 22:34:07 -07001088 DBUG_ON(xpc_any_hbs_allowed() != 0);
Dean Nelsona607c382005-09-01 14:01:37 -05001089
Dean Nelson5b8669d2008-07-29 22:34:18 -07001090 xpc_teardown_rsvd_page();
Dean Nelsona607c382005-09-01 14:01:37 -05001091
Dean Nelson65c17b82008-05-12 14:02:02 -07001092 if (reason == xpUnloading) {
Dean Nelson35190502008-04-22 14:48:55 -05001093 (void)unregister_die_notifier(&xpc_die_notifier);
Dean Nelsonbc63d382008-07-29 22:34:04 -07001094 (void)unregister_reboot_notifier(&xpc_reboot_notifier);
Dean Nelson0752c672006-01-10 11:07:19 -06001095 }
Dean Nelson780d09e2005-11-09 14:41:57 -06001096
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001097 /* clear the interface to XPC's functions */
1098 xpc_clear_interface();
1099
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001100 if (xpc_sysctl)
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001101 unregister_sysctl_table(xpc_sysctl);
Dean Nelson7682a4c2006-08-08 15:03:29 -05001102
Dean Nelson5b8669d2008-07-29 22:34:18 -07001103 xpc_teardown_partitions();
Dean Nelson6e410172008-07-29 22:34:09 -07001104
1105 if (is_shub())
1106 xpc_exit_sn2();
Dean Nelsonb7f7b072008-10-29 14:01:12 -07001107 else if (is_uv())
Dean Nelson6e410172008-07-29 22:34:09 -07001108 xpc_exit_uv();
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001109}
1110
Dean Nelsona607c382005-09-01 14:01:37 -05001111/*
Dean Nelsond6ad0332006-01-10 11:08:55 -06001112 * This function is called when the system is being rebooted.
1113 */
1114static int
1115xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
1116{
Dean Nelson65c17b82008-05-12 14:02:02 -07001117 enum xp_retval reason;
Dean Nelsond6ad0332006-01-10 11:08:55 -06001118
Dean Nelsond6ad0332006-01-10 11:08:55 -06001119 switch (event) {
1120 case SYS_RESTART:
Dean Nelson65c17b82008-05-12 14:02:02 -07001121 reason = xpSystemReboot;
Dean Nelsond6ad0332006-01-10 11:08:55 -06001122 break;
1123 case SYS_HALT:
Dean Nelson65c17b82008-05-12 14:02:02 -07001124 reason = xpSystemHalt;
Dean Nelsond6ad0332006-01-10 11:08:55 -06001125 break;
1126 case SYS_POWER_OFF:
Dean Nelson65c17b82008-05-12 14:02:02 -07001127 reason = xpSystemPoweroff;
Dean Nelsond6ad0332006-01-10 11:08:55 -06001128 break;
1129 default:
Dean Nelson65c17b82008-05-12 14:02:02 -07001130 reason = xpSystemGoingDown;
Dean Nelsond6ad0332006-01-10 11:08:55 -06001131 }
1132
1133 xpc_do_exit(reason);
1134 return NOTIFY_DONE;
1135}
1136
Dean Nelsond6ad0332006-01-10 11:08:55 -06001137/*
Dean Nelsona47d5da2008-07-29 22:34:09 -07001138 * Notify other partitions to deactivate from us by first disengaging from all
1139 * references to our memory.
Dean Nelson780d09e2005-11-09 14:41:57 -06001140 */
1141static void
Dean Nelsona47d5da2008-07-29 22:34:09 -07001142xpc_die_deactivate(void)
Dean Nelson780d09e2005-11-09 14:41:57 -06001143{
1144 struct xpc_partition *part;
Dean Nelson64d032b2008-05-12 14:02:03 -07001145 short partid;
Dean Nelsona47d5da2008-07-29 22:34:09 -07001146 int any_engaged;
Dean Nelson261f3b42008-07-29 22:34:16 -07001147 long keep_waiting;
1148 long wait_to_print;
Dean Nelson780d09e2005-11-09 14:41:57 -06001149
Dean Nelson780d09e2005-11-09 14:41:57 -06001150 /* keep xpc_hb_checker thread from doing anything (just in case) */
1151 xpc_exiting = 1;
1152
Dean Nelson33ba3c72008-07-29 22:34:07 -07001153 xpc_disallow_all_hbs(); /*indicate we're deactivated */
Dean Nelson780d09e2005-11-09 14:41:57 -06001154
Dean Nelsonbc63d382008-07-29 22:34:04 -07001155 for (partid = 0; partid < xp_max_npartitions; partid++) {
Dean Nelson780d09e2005-11-09 14:41:57 -06001156 part = &xpc_partitions[partid];
1157
Dean Nelsona47d5da2008-07-29 22:34:09 -07001158 if (xpc_partition_engaged(partid) ||
Dean Nelson83469b52008-07-29 22:34:18 -07001159 part->act_state != XPC_P_AS_INACTIVE) {
Dean Nelsona47d5da2008-07-29 22:34:09 -07001160 xpc_request_partition_deactivation(part);
1161 xpc_indicate_partition_disengaged(part);
Dean Nelson780d09e2005-11-09 14:41:57 -06001162 }
1163 }
1164
Dean Nelsona47d5da2008-07-29 22:34:09 -07001165 /*
1166 * Though we requested that all other partitions deactivate from us,
Dean Nelson261f3b42008-07-29 22:34:16 -07001167 * 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.
Dean Nelsona47d5da2008-07-29 22:34:09 -07001173 */
Dean Nelson261f3b42008-07-29 22:34:16 -07001174 keep_waiting = xpc_disengage_timelimit * 1000 * 5;
1175 wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5;
Dean Nelson780d09e2005-11-09 14:41:57 -06001176
Dean Nelson1ecaded2006-01-06 09:48:21 -06001177 while (1) {
Dean Nelsona47d5da2008-07-29 22:34:09 -07001178 any_engaged = xpc_any_partition_engaged();
1179 if (!any_engaged) {
1180 dev_info(xpc_part, "all partitions have deactivated\n");
Dean Nelson1ecaded2006-01-06 09:48:21 -06001181 break;
1182 }
Dean Nelson780d09e2005-11-09 14:41:57 -06001183
Dean Nelson261f3b42008-07-29 22:34:16 -07001184 if (!keep_waiting--) {
Dean Nelsonbc63d382008-07-29 22:34:04 -07001185 for (partid = 0; partid < xp_max_npartitions;
1186 partid++) {
Dean Nelsona47d5da2008-07-29 22:34:09 -07001187 if (xpc_partition_engaged(partid)) {
1188 dev_info(xpc_part, "deactivate from "
Dean Nelson35190502008-04-22 14:48:55 -05001189 "remote partition %d timed "
1190 "out\n", partid);
Dean Nelson1ecaded2006-01-06 09:48:21 -06001191 }
1192 }
1193 break;
1194 }
1195
Dean Nelson261f3b42008-07-29 22:34:16 -07001196 if (!wait_to_print--) {
Dean Nelson780d09e2005-11-09 14:41:57 -06001197 dev_info(xpc_part, "waiting for remote partitions to "
Dean Nelsona47d5da2008-07-29 22:34:09 -07001198 "deactivate, timeout in %ld seconds\n",
Dean Nelson261f3b42008-07-29 22:34:16 -07001199 keep_waiting / (1000 * 5));
1200 wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL *
1201 1000 * 5;
Dean Nelson780d09e2005-11-09 14:41:57 -06001202 }
Dean Nelson261f3b42008-07-29 22:34:16 -07001203
1204 udelay(200);
Dean Nelson780d09e2005-11-09 14:41:57 -06001205 }
Dean Nelson780d09e2005-11-09 14:41:57 -06001206}
1207
Dean Nelson780d09e2005-11-09 14:41:57 -06001208/*
Dean Nelson1f4674b2006-01-10 11:08:00 -06001209 * 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.
Dean Nelson780d09e2005-11-09 14:41:57 -06001215 */
1216static int
1217xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
1218{
Dean Nelson261f3b42008-07-29 22:34:16 -07001219#ifdef CONFIG_IA64 /* !!! temporary kludge */
Dean Nelson780d09e2005-11-09 14:41:57 -06001220 switch (event) {
1221 case DIE_MACHINE_RESTART:
1222 case DIE_MACHINE_HALT:
Dean Nelsona47d5da2008-07-29 22:34:09 -07001223 xpc_die_deactivate();
Dean Nelson780d09e2005-11-09 14:41:57 -06001224 break;
Dean Nelson1f4674b2006-01-10 11:08:00 -06001225
1226 case DIE_KDEBUG_ENTER:
1227 /* Should lack of heartbeat be ignored by other partitions? */
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001228 if (!xpc_kdebug_ignore)
Dean Nelson1f4674b2006-01-10 11:08:00 -06001229 break;
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001230
Dean Nelson1f4674b2006-01-10 11:08:00 -06001231 /* fall through */
Dean Nelson780d09e2005-11-09 14:41:57 -06001232 case DIE_MCA_MONARCH_ENTER:
1233 case DIE_INIT_MONARCH_ENTER:
Dean Nelson33ba3c72008-07-29 22:34:07 -07001234 xpc_offline_heartbeat();
Dean Nelson780d09e2005-11-09 14:41:57 -06001235 break;
Dean Nelson1f4674b2006-01-10 11:08:00 -06001236
1237 case DIE_KDEBUG_LEAVE:
1238 /* Is lack of heartbeat being ignored by other partitions? */
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001239 if (!xpc_kdebug_ignore)
Dean Nelson1f4674b2006-01-10 11:08:00 -06001240 break;
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001241
Dean Nelson1f4674b2006-01-10 11:08:00 -06001242 /* fall through */
Dean Nelson780d09e2005-11-09 14:41:57 -06001243 case DIE_MCA_MONARCH_LEAVE:
1244 case DIE_INIT_MONARCH_LEAVE:
Dean Nelson33ba3c72008-07-29 22:34:07 -07001245 xpc_online_heartbeat();
Dean Nelson780d09e2005-11-09 14:41:57 -06001246 break;
1247 }
Dean Nelson261f3b42008-07-29 22:34:16 -07001248#else
1249 xpc_die_deactivate();
1250#endif
Dean Nelson780d09e2005-11-09 14:41:57 -06001251
1252 return NOTIFY_DONE;
1253}
1254
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001255int __init
1256xpc_init(void)
1257{
1258 int ret;
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001259 struct task_struct *kthread;
Dean Nelsonee6665e2008-07-29 22:34:13 -07001260
Kay Sieversbb0dc432009-01-06 10:44:37 -08001261 dev_set_name(xpc_part, "part");
1262 dev_set_name(xpc_chan, "chan");
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001263
Dean Nelson94bd2702008-07-29 22:34:05 -07001264 if (is_shub()) {
1265 /*
1266 * The ia64-sn2 architecture supports at most 64 partitions.
Dean Nelsonc39838c2008-07-29 22:34:11 -07001267 * And the inability to unregister remote amos restricts us
Dean Nelson94bd2702008-07-29 22:34:05 -07001268 * further to only support exactly 64 partitions on this
1269 * architecture, no less.
1270 */
Dean Nelson5b8669d2008-07-29 22:34:18 -07001271 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 }
Dean Nelson94bd2702008-07-29 22:34:05 -07001277
1278 } else if (is_uv()) {
Dean Nelson5b8669d2008-07-29 22:34:18 -07001279 ret = xpc_init_uv();
Dean Nelson94bd2702008-07-29 22:34:05 -07001280
1281 } else {
Dean Nelson5b8669d2008-07-29 22:34:18 -07001282 ret = -ENODEV;
Dean Nelson94bd2702008-07-29 22:34:05 -07001283 }
Dean Nelson408865c2005-09-08 10:46:58 -05001284
Dean Nelson5b8669d2008-07-29 22:34:18 -07001285 if (ret != 0)
1286 return ret;
1287
1288 ret = xpc_setup_partitions();
1289 if (ret != 0) {
Dean Nelsonbc63d382008-07-29 22:34:04 -07001290 dev_err(xpc_part, "can't get memory for partition structure\n");
Dean Nelsonee6665e2008-07-29 22:34:13 -07001291 goto out_1;
Dean Nelsonbc63d382008-07-29 22:34:04 -07001292 }
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001293
Dean Nelsonbc63d382008-07-29 22:34:04 -07001294 xpc_sysctl = register_sysctl_table(xpc_sys_dir);
1295
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001296 /*
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001297 * Fill the partition reserved page with the information needed by
1298 * other partitions to discover we are alive and establish initial
1299 * communications.
1300 */
Dean Nelson5b8669d2008-07-29 22:34:18 -07001301 ret = xpc_setup_rsvd_page();
1302 if (ret != 0) {
Dean Nelsonbc63d382008-07-29 22:34:04 -07001303 dev_err(xpc_part, "can't setup our reserved page\n");
Dean Nelsonee6665e2008-07-29 22:34:13 -07001304 goto out_2;
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001305 }
1306
Dean Nelsona607c382005-09-01 14:01:37 -05001307 /* add ourselves to the reboot_notifier_list */
1308 ret = register_reboot_notifier(&xpc_reboot_notifier);
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001309 if (ret != 0)
Dean Nelsona607c382005-09-01 14:01:37 -05001310 dev_warn(xpc_part, "can't register reboot notifier\n");
Dean Nelsona607c382005-09-01 14:01:37 -05001311
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -07001312 /* add ourselves to the die_notifier list */
Dean Nelson780d09e2005-11-09 14:41:57 -06001313 ret = register_die_notifier(&xpc_die_notifier);
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001314 if (ret != 0)
Dean Nelson780d09e2005-11-09 14:41:57 -06001315 dev_warn(xpc_part, "can't register die notifier\n");
Dean Nelson780d09e2005-11-09 14:41:57 -06001316
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001317 /*
1318 * The real work-horse behind xpc. This processes incoming
1319 * interrupts and monitors remote heartbeats.
1320 */
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001321 kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME);
1322 if (IS_ERR(kthread)) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001323 dev_err(xpc_part, "failed while forking hb check thread\n");
Dean Nelsonbc63d382008-07-29 22:34:04 -07001324 ret = -EBUSY;
Dean Nelsonee6665e2008-07-29 22:34:13 -07001325 goto out_3;
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001326 }
1327
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001328 /*
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 */
Dean Nelson2c2b94f2008-04-22 14:50:17 -05001333 kthread = kthread_run(xpc_initiate_discovery, NULL,
1334 XPC_DISCOVERY_THREAD_NAME);
1335 if (IS_ERR(kthread)) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001336 dev_err(xpc_part, "failed while forking discovery thread\n");
1337
1338 /* mark this new thread as a non-starter */
Jes Sorensenf9e505a2006-01-17 12:52:21 -05001339 complete(&xpc_discovery_exited);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001340
Dean Nelson65c17b82008-05-12 14:02:02 -07001341 xpc_do_exit(xpUnloading);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001342 return -EBUSY;
1343 }
1344
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001345 /* set the interface to point at XPC's functions */
1346 xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
Dean Nelson97bf1aa2008-07-29 22:34:08 -07001347 xpc_initiate_send, xpc_initiate_send_notify,
1348 xpc_initiate_received, xpc_initiate_partid_to_nasids);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001349
1350 return 0;
Dean Nelsonbc63d382008-07-29 22:34:04 -07001351
1352 /* initialization was not successful */
Dean Nelsonee6665e2008-07-29 22:34:13 -07001353out_3:
Dean Nelson5b8669d2008-07-29 22:34:18 -07001354 xpc_teardown_rsvd_page();
Dean Nelson94bd2702008-07-29 22:34:05 -07001355
Dean Nelsonbc63d382008-07-29 22:34:04 -07001356 (void)unregister_die_notifier(&xpc_die_notifier);
1357 (void)unregister_reboot_notifier(&xpc_reboot_notifier);
Dean Nelsonee6665e2008-07-29 22:34:13 -07001358out_2:
Dean Nelsonbc63d382008-07-29 22:34:04 -07001359 if (xpc_sysctl)
1360 unregister_sysctl_table(xpc_sysctl);
Dean Nelson5b8669d2008-07-29 22:34:18 -07001361
1362 xpc_teardown_partitions();
Dean Nelson6e410172008-07-29 22:34:09 -07001363out_1:
1364 if (is_shub())
1365 xpc_exit_sn2();
Dean Nelsonb7f7b072008-10-29 14:01:12 -07001366 else if (is_uv())
Dean Nelson6e410172008-07-29 22:34:09 -07001367 xpc_exit_uv();
Dean Nelsonbc63d382008-07-29 22:34:04 -07001368 return ret;
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001369}
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001370
Dean Nelson35190502008-04-22 14:48:55 -05001371module_init(xpc_init);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001372
1373void __exit
1374xpc_exit(void)
1375{
Dean Nelson65c17b82008-05-12 14:02:02 -07001376 xpc_do_exit(xpUnloading);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001377}
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001378
Dean Nelson35190502008-04-22 14:48:55 -05001379module_exit(xpc_exit);
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001380
1381MODULE_AUTHOR("Silicon Graphics, Inc.");
1382MODULE_DESCRIPTION("Cross Partition Communication (XPC) support");
1383MODULE_LICENSE("GPL");
1384
1385module_param(xpc_hb_interval, int, 0);
1386MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between "
Dean Nelson35190502008-04-22 14:48:55 -05001387 "heartbeat increments.");
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001388
1389module_param(xpc_hb_check_interval, int, 0);
1390MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between "
Dean Nelson35190502008-04-22 14:48:55 -05001391 "heartbeat checks.");
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001392
Dean Nelsona47d5da2008-07-29 22:34:09 -07001393module_param(xpc_disengage_timelimit, int, 0);
1394MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait "
1395 "for disengage to complete.");
Dean Nelsone54af722005-10-25 14:07:43 -05001396
Dean Nelson1f4674b2006-01-10 11:08:00 -06001397module_param(xpc_kdebug_ignore, int, 0);
1398MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by "
Dean Nelson35190502008-04-22 14:48:55 -05001399 "other partitions when dropping into kdebug.");