Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 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 | * |
Robin Holt | a374c57 | 2009-04-13 14:40:18 -0700 | [diff] [blame] | 6 | * Copyright (c) 2004-2009 Silicon Graphics, Inc. All Rights Reserved. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 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 | * |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 28 | * . Currently on sn2, we have no way to determine which nasid an IRQ |
Dean Nelson | c39838c | 2008-07-29 22:34:11 -0700 | [diff] [blame] | 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 |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 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 |
Dean Nelson | c39838c | 2008-07-29 22:34:11 -0700 | [diff] [blame] | 38 | * cleanup) any errors due to the remote amo write, PIO read, and/or |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 39 | * PIO write operations. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 40 | * |
| 41 | * If/when new hardware solves this IPI problem, we should abandon |
| 42 | * the current approach. |
| 43 | * |
| 44 | */ |
| 45 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 46 | #include <linux/module.h> |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 47 | #include <linux/sysctl.h> |
| 48 | #include <linux/device.h> |
Nishanth Aravamudan | 6991392 | 2005-07-08 17:10:00 -0700 | [diff] [blame] | 49 | #include <linux/delay.h> |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 50 | #include <linux/reboot.h> |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 51 | #include <linux/kdebug.h> |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 52 | #include <linux/kthread.h> |
Dean Nelson | 45d9ca4 | 2008-04-22 14:46:56 -0500 | [diff] [blame] | 53 | #include "xpc.h" |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 54 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 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 = { |
Kay Sievers | bb0dc43 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 62 | .init_name = "", /* set to "part" at xpc_init() time */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 63 | .driver = &xpc_dbg_name |
| 64 | }; |
| 65 | |
| 66 | struct device xpc_chan_dbg_subname = { |
Kay Sievers | bb0dc43 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 67 | .init_name = "", /* set to "chan" at xpc_init() time */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 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 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 74 | static int xpc_kdebug_ignore; |
| 75 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 76 | /* systune related variables for /proc/sys directories */ |
| 77 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 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; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 81 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 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; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 85 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 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; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 89 | |
| 90 | static ctl_table xpc_sys_xpc_hb_dir[] = { |
| 91 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 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}, |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 101 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 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}, |
Eric W. Biederman | 68cbf07 | 2007-02-14 00:33:41 -0800 | [diff] [blame] | 111 | {} |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 112 | }; |
| 113 | static ctl_table xpc_sys_xpc_dir[] = { |
| 114 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 115 | .ctl_name = CTL_UNNUMBERED, |
| 116 | .procname = "hb", |
| 117 | .mode = 0555, |
| 118 | .child = xpc_sys_xpc_hb_dir}, |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 119 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 120 | .ctl_name = CTL_UNNUMBERED, |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 121 | .procname = "disengage_timelimit", |
| 122 | .data = &xpc_disengage_timelimit, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 123 | .maxlen = sizeof(int), |
| 124 | .mode = 0644, |
| 125 | .proc_handler = &proc_dointvec_minmax, |
| 126 | .strategy = &sysctl_intvec, |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 127 | .extra1 = &xpc_disengage_min_timelimit, |
| 128 | .extra2 = &xpc_disengage_max_timelimit}, |
Eric W. Biederman | 68cbf07 | 2007-02-14 00:33:41 -0800 | [diff] [blame] | 129 | {} |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 130 | }; |
| 131 | static ctl_table xpc_sys_dir[] = { |
| 132 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 133 | .ctl_name = CTL_UNNUMBERED, |
| 134 | .procname = "xpc", |
| 135 | .mode = 0555, |
| 136 | .child = xpc_sys_xpc_dir}, |
Eric W. Biederman | 68cbf07 | 2007-02-14 00:33:41 -0800 | [diff] [blame] | 137 | {} |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 138 | }; |
| 139 | static struct ctl_table_header *xpc_sysctl; |
| 140 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 141 | /* non-zero if any remote partition disengage was timed out */ |
| 142 | int xpc_disengage_timedout; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 143 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 144 | /* #of activate IRQs received and not yet processed */ |
| 145 | int xpc_activate_IRQ_rcvd; |
| 146 | DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 147 | |
| 148 | /* IRQ handler notifies this wait queue on receipt of an IRQ */ |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 149 | DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 150 | |
| 151 | static unsigned long xpc_hb_check_timeout; |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 152 | static struct timer_list xpc_hb_timer; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 153 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 154 | /* notification that the xpc_hb_checker thread has exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 155 | static DECLARE_COMPLETION(xpc_hb_checker_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 156 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 157 | /* notification that the xpc_discovery thread has exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 158 | static DECLARE_COMPLETION(xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 159 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 160 | static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *); |
| 161 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 162 | static int xpc_system_reboot(struct notifier_block *, unsigned long, void *); |
| 163 | static struct notifier_block xpc_reboot_notifier = { |
| 164 | .notifier_call = xpc_system_reboot, |
| 165 | }; |
| 166 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 167 | static int xpc_system_die(struct notifier_block *, unsigned long, void *); |
| 168 | static struct notifier_block xpc_die_notifier = { |
| 169 | .notifier_call = xpc_system_die, |
| 170 | }; |
| 171 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 172 | struct xpc_arch_operations xpc_arch_ops; |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 173 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 174 | /* |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 175 | * Timer function to enforce the timelimit on the partition disengage. |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 176 | */ |
| 177 | static void |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 178 | xpc_timeout_partition_disengage(unsigned long data) |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 179 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 180 | struct xpc_partition *part = (struct xpc_partition *)data; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 181 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 182 | DBUG_ON(time_is_after_jiffies(part->disengage_timeout)); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 183 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 184 | (void)xpc_partition_disengaged(part); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 185 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 186 | DBUG_ON(part->disengage_timeout != 0); |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 187 | DBUG_ON(xpc_arch_ops.partition_engaged(XPC_PARTID(part))); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 188 | } |
| 189 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 190 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 191 | * Timer to produce the heartbeat. The timer structures function is |
| 192 | * already set when this is initially called. A tunable is used to |
| 193 | * specify when the next timeout should occur. |
| 194 | */ |
| 195 | static void |
| 196 | xpc_hb_beater(unsigned long dummy) |
| 197 | { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 198 | xpc_arch_ops.increment_heartbeat(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 199 | |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 200 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 201 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 202 | |
| 203 | xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ); |
| 204 | add_timer(&xpc_hb_timer); |
| 205 | } |
| 206 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 207 | static void |
| 208 | xpc_start_hb_beater(void) |
| 209 | { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 210 | xpc_arch_ops.heartbeat_init(); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 211 | init_timer(&xpc_hb_timer); |
| 212 | xpc_hb_timer.function = xpc_hb_beater; |
| 213 | xpc_hb_beater(0); |
| 214 | } |
| 215 | |
| 216 | static void |
| 217 | xpc_stop_hb_beater(void) |
| 218 | { |
| 219 | del_timer_sync(&xpc_hb_timer); |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 220 | xpc_arch_ops.heartbeat_exit(); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 223 | /* |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 224 | * At periodic intervals, scan through all active partitions and ensure |
| 225 | * their heartbeat is still active. If not, the partition is deactivated. |
| 226 | */ |
| 227 | static void |
| 228 | xpc_check_remote_hb(void) |
| 229 | { |
| 230 | struct xpc_partition *part; |
| 231 | short partid; |
| 232 | enum xp_retval ret; |
| 233 | |
| 234 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
| 235 | |
| 236 | if (xpc_exiting) |
| 237 | break; |
| 238 | |
| 239 | if (partid == xp_partition_id) |
| 240 | continue; |
| 241 | |
| 242 | part = &xpc_partitions[partid]; |
| 243 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 244 | if (part->act_state == XPC_P_AS_INACTIVE || |
| 245 | part->act_state == XPC_P_AS_DEACTIVATING) { |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 246 | continue; |
| 247 | } |
| 248 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 249 | ret = xpc_arch_ops.get_remote_heartbeat(part); |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 250 | if (ret != xpSuccess) |
| 251 | XPC_DEACTIVATE_PARTITION(part, ret); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 256 | * This thread is responsible for nearly all of the partition |
| 257 | * activation/deactivation. |
| 258 | */ |
| 259 | static int |
| 260 | xpc_hb_checker(void *ignore) |
| 261 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 262 | int force_IRQ = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 263 | |
| 264 | /* this thread was marked active by xpc_hb_init() */ |
| 265 | |
Rusty Russell | f7df8ed | 2009-01-10 21:58:09 -0800 | [diff] [blame] | 266 | set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 267 | |
Dean Nelson | 4c013f5 | 2007-11-07 07:53:06 -0600 | [diff] [blame] | 268 | /* set our heartbeating to other partitions into motion */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 269 | xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 270 | xpc_start_hb_beater(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 271 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 272 | while (!xpc_exiting) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 273 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 274 | dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have " |
| 275 | "been received\n", |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 276 | (int)(xpc_hb_check_timeout - jiffies), |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 277 | xpc_activate_IRQ_rcvd); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 278 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 279 | /* checking of remote heartbeats is skewed by IRQ handling */ |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 280 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 281 | xpc_hb_check_timeout = jiffies + |
| 282 | (xpc_hb_check_interval * HZ); |
| 283 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 284 | dev_dbg(xpc_part, "checking remote heartbeats\n"); |
| 285 | xpc_check_remote_hb(); |
| 286 | |
| 287 | /* |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 288 | * On sn2 we need to periodically recheck to ensure no |
| 289 | * IRQ/amo pairs have been missed. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 290 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 291 | if (is_shub()) |
| 292 | force_IRQ = 1; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 293 | } |
| 294 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 295 | /* check for outstanding IRQs */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 296 | if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 297 | force_IRQ = 0; |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 298 | dev_dbg(xpc_part, "processing activate IRQs " |
| 299 | "received\n"); |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 300 | xpc_arch_ops.process_activate_IRQ_rcvd(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 301 | } |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 302 | |
| 303 | /* wait for IRQ or timeout */ |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 304 | (void)wait_event_interruptible(xpc_activate_IRQ_wq, |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 305 | (time_is_before_eq_jiffies( |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 306 | xpc_hb_check_timeout) || |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 307 | xpc_activate_IRQ_rcvd > 0 || |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 308 | xpc_exiting)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 309 | } |
| 310 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 311 | xpc_stop_hb_beater(); |
| 312 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 313 | dev_dbg(xpc_part, "heartbeat checker is exiting\n"); |
| 314 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 315 | /* mark this thread as having exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 316 | complete(&xpc_hb_checker_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 317 | return 0; |
| 318 | } |
| 319 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 320 | /* |
| 321 | * This thread will attempt to discover other partitions to activate |
| 322 | * based on info provided by SAL. This new thread is short lived and |
| 323 | * will exit once discovery is complete. |
| 324 | */ |
| 325 | static int |
| 326 | xpc_initiate_discovery(void *ignore) |
| 327 | { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 328 | xpc_discovery(); |
| 329 | |
| 330 | dev_dbg(xpc_part, "discovery thread is exiting\n"); |
| 331 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 332 | /* mark this thread as having exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 333 | complete(&xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 334 | return 0; |
| 335 | } |
| 336 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 337 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 338 | * The first kthread assigned to a newly activated partition is the one |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 339 | * created by XPC HB with which it calls xpc_activating(). XPC hangs on to |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 340 | * that kthread until the partition is brought down, at which time that kthread |
| 341 | * returns back to XPC HB. (The return of that kthread will signify to XPC HB |
| 342 | * that XPC has dismantled all communication infrastructure for the associated |
| 343 | * partition.) This kthread becomes the channel manager for that partition. |
| 344 | * |
| 345 | * Each active partition has a channel manager, who, besides connecting and |
| 346 | * disconnecting channels, will ensure that each of the partition's connected |
| 347 | * channels has the required number of assigned kthreads to get the work done. |
| 348 | */ |
| 349 | static void |
| 350 | xpc_channel_mgr(struct xpc_partition *part) |
| 351 | { |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 352 | while (part->act_state != XPC_P_AS_DEACTIVATING || |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 353 | atomic_read(&part->nchannels_active) > 0 || |
| 354 | !xpc_partition_disengaged(part)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 355 | |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 356 | xpc_process_sent_chctl_flags(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 357 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 358 | /* |
| 359 | * Wait until we've been requested to activate kthreads or |
| 360 | * all of the channel's message queues have been torn down or |
| 361 | * a signal is pending. |
| 362 | * |
| 363 | * The channel_mgr_requests is set to 1 after being awakened, |
| 364 | * This is done to prevent the channel mgr from making one pass |
| 365 | * through the loop for each request, since he will |
| 366 | * be servicing all the requests in one pass. The reason it's |
| 367 | * set to 1 instead of 0 is so that other kthreads will know |
| 368 | * that the channel mgr is running and won't bother trying to |
| 369 | * wake him up. |
| 370 | */ |
| 371 | atomic_dec(&part->channel_mgr_requests); |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 372 | (void)wait_event_interruptible(part->channel_mgr_wq, |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 373 | (atomic_read(&part->channel_mgr_requests) > 0 || |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 374 | part->chctl.all_flags != 0 || |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 375 | (part->act_state == XPC_P_AS_DEACTIVATING && |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 376 | atomic_read(&part->nchannels_active) == 0 && |
| 377 | xpc_partition_disengaged(part)))); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 378 | atomic_set(&part->channel_mgr_requests, 1); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 379 | } |
| 380 | } |
| 381 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 382 | /* |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 383 | * Guarantee that the kzalloc'd memory is cacheline aligned. |
| 384 | */ |
| 385 | void * |
| 386 | xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base) |
| 387 | { |
| 388 | /* see if kzalloc will give us cachline aligned memory by default */ |
| 389 | *base = kzalloc(size, flags); |
| 390 | if (*base == NULL) |
| 391 | return NULL; |
| 392 | |
| 393 | if ((u64)*base == L1_CACHE_ALIGN((u64)*base)) |
| 394 | return *base; |
| 395 | |
| 396 | kfree(*base); |
| 397 | |
| 398 | /* nope, we'll have to do it ourselves */ |
| 399 | *base = kzalloc(size + L1_CACHE_BYTES, flags); |
| 400 | if (*base == NULL) |
| 401 | return NULL; |
| 402 | |
| 403 | return (void *)L1_CACHE_ALIGN((u64)*base); |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * Setup the channel structures necessary to support XPartition Communication |
| 408 | * between the specified remote partition and the local one. |
| 409 | */ |
| 410 | static enum xp_retval |
| 411 | xpc_setup_ch_structures(struct xpc_partition *part) |
| 412 | { |
| 413 | enum xp_retval ret; |
| 414 | int ch_number; |
| 415 | struct xpc_channel *ch; |
| 416 | short partid = XPC_PARTID(part); |
| 417 | |
| 418 | /* |
| 419 | * Allocate all of the channel structures as a contiguous chunk of |
| 420 | * memory. |
| 421 | */ |
| 422 | DBUG_ON(part->channels != NULL); |
| 423 | part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS, |
| 424 | GFP_KERNEL); |
| 425 | if (part->channels == NULL) { |
| 426 | dev_err(xpc_chan, "can't get memory for channels\n"); |
| 427 | return xpNoMemory; |
| 428 | } |
| 429 | |
| 430 | /* allocate the remote open and close args */ |
| 431 | |
| 432 | part->remote_openclose_args = |
| 433 | xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, |
| 434 | GFP_KERNEL, &part-> |
| 435 | remote_openclose_args_base); |
| 436 | if (part->remote_openclose_args == NULL) { |
| 437 | dev_err(xpc_chan, "can't get memory for remote connect args\n"); |
| 438 | ret = xpNoMemory; |
| 439 | goto out_1; |
| 440 | } |
| 441 | |
| 442 | part->chctl.all_flags = 0; |
| 443 | spin_lock_init(&part->chctl_lock); |
| 444 | |
| 445 | atomic_set(&part->channel_mgr_requests, 1); |
| 446 | init_waitqueue_head(&part->channel_mgr_wq); |
| 447 | |
| 448 | part->nchannels = XPC_MAX_NCHANNELS; |
| 449 | |
| 450 | atomic_set(&part->nchannels_active, 0); |
| 451 | atomic_set(&part->nchannels_engaged, 0); |
| 452 | |
| 453 | for (ch_number = 0; ch_number < part->nchannels; ch_number++) { |
| 454 | ch = &part->channels[ch_number]; |
| 455 | |
| 456 | ch->partid = partid; |
| 457 | ch->number = ch_number; |
| 458 | ch->flags = XPC_C_DISCONNECTED; |
| 459 | |
| 460 | atomic_set(&ch->kthreads_assigned, 0); |
| 461 | atomic_set(&ch->kthreads_idle, 0); |
| 462 | atomic_set(&ch->kthreads_active, 0); |
| 463 | |
| 464 | atomic_set(&ch->references, 0); |
| 465 | atomic_set(&ch->n_to_notify, 0); |
| 466 | |
| 467 | spin_lock_init(&ch->lock); |
| 468 | init_completion(&ch->wdisconnect_wait); |
| 469 | |
| 470 | atomic_set(&ch->n_on_msg_allocate_wq, 0); |
| 471 | init_waitqueue_head(&ch->msg_allocate_wq); |
| 472 | init_waitqueue_head(&ch->idle_wq); |
| 473 | } |
| 474 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 475 | ret = xpc_arch_ops.setup_ch_structures(part); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 476 | if (ret != xpSuccess) |
| 477 | goto out_2; |
| 478 | |
| 479 | /* |
| 480 | * With the setting of the partition setup_state to XPC_P_SS_SETUP, |
| 481 | * we're declaring that this partition is ready to go. |
| 482 | */ |
| 483 | part->setup_state = XPC_P_SS_SETUP; |
| 484 | |
| 485 | return xpSuccess; |
| 486 | |
| 487 | /* setup of ch structures failed */ |
| 488 | out_2: |
| 489 | kfree(part->remote_openclose_args_base); |
| 490 | part->remote_openclose_args = NULL; |
| 491 | out_1: |
| 492 | kfree(part->channels); |
| 493 | part->channels = NULL; |
| 494 | return ret; |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * Teardown the channel structures necessary to support XPartition Communication |
| 499 | * between the specified remote partition and the local one. |
| 500 | */ |
| 501 | static void |
| 502 | xpc_teardown_ch_structures(struct xpc_partition *part) |
| 503 | { |
| 504 | DBUG_ON(atomic_read(&part->nchannels_engaged) != 0); |
| 505 | DBUG_ON(atomic_read(&part->nchannels_active) != 0); |
| 506 | |
| 507 | /* |
| 508 | * Make this partition inaccessible to local processes by marking it |
| 509 | * as no longer setup. Then wait before proceeding with the teardown |
| 510 | * until all existing references cease. |
| 511 | */ |
| 512 | DBUG_ON(part->setup_state != XPC_P_SS_SETUP); |
| 513 | part->setup_state = XPC_P_SS_WTEARDOWN; |
| 514 | |
| 515 | wait_event(part->teardown_wq, (atomic_read(&part->references) == 0)); |
| 516 | |
| 517 | /* now we can begin tearing down the infrastructure */ |
| 518 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 519 | xpc_arch_ops.teardown_ch_structures(part); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 520 | |
| 521 | kfree(part->remote_openclose_args_base); |
| 522 | part->remote_openclose_args = NULL; |
| 523 | kfree(part->channels); |
| 524 | part->channels = NULL; |
| 525 | |
| 526 | part->setup_state = XPC_P_SS_TORNDOWN; |
| 527 | } |
| 528 | |
| 529 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 530 | * When XPC HB determines that a partition has come up, it will create a new |
| 531 | * kthread and that kthread will call this function to attempt to set up the |
| 532 | * basic infrastructure used for Cross Partition Communication with the newly |
| 533 | * upped partition. |
| 534 | * |
| 535 | * The kthread that was created by XPC HB and which setup the XPC |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 536 | * infrastructure will remain assigned to the partition becoming the channel |
| 537 | * manager for that partition until the partition is deactivating, at which |
| 538 | * time the kthread will teardown the XPC infrastructure and then exit. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 539 | */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 540 | static int |
| 541 | xpc_activating(void *__partid) |
| 542 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 543 | short partid = (u64)__partid; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 544 | struct xpc_partition *part = &xpc_partitions[partid]; |
| 545 | unsigned long irq_flags; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 546 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 547 | DBUG_ON(partid < 0 || partid >= xp_max_npartitions); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 548 | |
| 549 | spin_lock_irqsave(&part->act_lock, irq_flags); |
| 550 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 551 | if (part->act_state == XPC_P_AS_DEACTIVATING) { |
| 552 | part->act_state = XPC_P_AS_INACTIVE; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 553 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 554 | part->remote_rp_pa = 0; |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | /* indicate the thread is activating */ |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 559 | DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ); |
| 560 | part->act_state = XPC_P_AS_ACTIVATING; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 561 | |
| 562 | XPC_SET_REASON(part, 0, 0); |
| 563 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 564 | |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 565 | dev_dbg(xpc_part, "activating partition %d\n", partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 566 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 567 | xpc_arch_ops.allow_hb(partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 568 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 569 | if (xpc_setup_ch_structures(part) == xpSuccess) { |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 570 | (void)xpc_part_ref(part); /* this will always succeed */ |
| 571 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 572 | if (xpc_arch_ops.make_first_contact(part) == xpSuccess) { |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 573 | xpc_mark_partition_active(part); |
| 574 | xpc_channel_mgr(part); |
| 575 | /* won't return until partition is deactivating */ |
| 576 | } |
| 577 | |
| 578 | xpc_part_deref(part); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 579 | xpc_teardown_ch_structures(part); |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 580 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 581 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 582 | xpc_arch_ops.disallow_hb(partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 583 | xpc_mark_partition_inactive(part); |
| 584 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 585 | if (part->reason == xpReactivating) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 586 | /* interrupting ourselves results in activating partition */ |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 587 | xpc_arch_ops.request_partition_reactivation(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | return 0; |
| 591 | } |
| 592 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 593 | void |
| 594 | xpc_activate_partition(struct xpc_partition *part) |
| 595 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 596 | short partid = XPC_PARTID(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 597 | unsigned long irq_flags; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 598 | struct task_struct *kthread; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 599 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 600 | spin_lock_irqsave(&part->act_lock, irq_flags); |
| 601 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 602 | DBUG_ON(part->act_state != XPC_P_AS_INACTIVE); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 603 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 604 | part->act_state = XPC_P_AS_ACTIVATION_REQ; |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 605 | XPC_SET_REASON(part, xpCloneKThread, __LINE__); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 606 | |
| 607 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 608 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 609 | kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d", |
| 610 | partid); |
| 611 | if (IS_ERR(kthread)) { |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 612 | spin_lock_irqsave(&part->act_lock, irq_flags); |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 613 | part->act_state = XPC_P_AS_INACTIVE; |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 614 | XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__); |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 615 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 616 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 617 | } |
| 618 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 619 | void |
| 620 | xpc_activate_kthreads(struct xpc_channel *ch, int needed) |
| 621 | { |
| 622 | int idle = atomic_read(&ch->kthreads_idle); |
| 623 | int assigned = atomic_read(&ch->kthreads_assigned); |
| 624 | int wakeup; |
| 625 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 626 | DBUG_ON(needed <= 0); |
| 627 | |
| 628 | if (idle > 0) { |
| 629 | wakeup = (needed > idle) ? idle : needed; |
| 630 | needed -= wakeup; |
| 631 | |
| 632 | dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, " |
| 633 | "channel=%d\n", wakeup, ch->partid, ch->number); |
| 634 | |
| 635 | /* only wakeup the requested number of kthreads */ |
| 636 | wake_up_nr(&ch->idle_wq, wakeup); |
| 637 | } |
| 638 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 639 | if (needed <= 0) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 640 | return; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 641 | |
| 642 | if (needed + assigned > ch->kthreads_assigned_limit) { |
| 643 | needed = ch->kthreads_assigned_limit - assigned; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 644 | if (needed <= 0) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 645 | return; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 646 | } |
| 647 | |
| 648 | dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n", |
| 649 | needed, ch->partid, ch->number); |
| 650 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 651 | xpc_create_kthreads(ch, needed, 0); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 652 | } |
| 653 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 654 | /* |
| 655 | * This function is where XPC's kthreads wait for messages to deliver. |
| 656 | */ |
| 657 | static void |
| 658 | xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch) |
| 659 | { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 660 | int (*n_of_deliverable_payloads) (struct xpc_channel *) = |
| 661 | xpc_arch_ops.n_of_deliverable_payloads; |
| 662 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 663 | do { |
| 664 | /* deliver messages to their intended recipients */ |
| 665 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 666 | while (n_of_deliverable_payloads(ch) > 0 && |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 667 | !(ch->flags & XPC_C_DISCONNECTING)) { |
Dean Nelson | bd3e64c | 2008-07-29 22:34:19 -0700 | [diff] [blame] | 668 | xpc_deliver_payload(ch); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | if (atomic_inc_return(&ch->kthreads_idle) > |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 672 | ch->kthreads_idle_limit) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 673 | /* too many idle kthreads on this channel */ |
| 674 | atomic_dec(&ch->kthreads_idle); |
| 675 | break; |
| 676 | } |
| 677 | |
| 678 | dev_dbg(xpc_chan, "idle kthread calling " |
| 679 | "wait_event_interruptible_exclusive()\n"); |
| 680 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 681 | (void)wait_event_interruptible_exclusive(ch->idle_wq, |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 682 | (n_of_deliverable_payloads(ch) > 0 || |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 683 | (ch->flags & XPC_C_DISCONNECTING))); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 684 | |
| 685 | atomic_dec(&ch->kthreads_idle); |
| 686 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 687 | } while (!(ch->flags & XPC_C_DISCONNECTING)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 688 | } |
| 689 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 690 | static int |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 691 | xpc_kthread_start(void *args) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 692 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 693 | short partid = XPC_UNPACK_ARG1(args); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 694 | u16 ch_number = XPC_UNPACK_ARG2(args); |
| 695 | struct xpc_partition *part = &xpc_partitions[partid]; |
| 696 | struct xpc_channel *ch; |
| 697 | int n_needed; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 698 | unsigned long irq_flags; |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 699 | int (*n_of_deliverable_payloads) (struct xpc_channel *) = |
| 700 | xpc_arch_ops.n_of_deliverable_payloads; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 701 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 702 | dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n", |
| 703 | partid, ch_number); |
| 704 | |
| 705 | ch = &part->channels[ch_number]; |
| 706 | |
| 707 | if (!(ch->flags & XPC_C_DISCONNECTING)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 708 | |
| 709 | /* let registerer know that connection has been established */ |
| 710 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 711 | spin_lock_irqsave(&ch->lock, irq_flags); |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 712 | if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) { |
| 713 | ch->flags |= XPC_C_CONNECTEDCALLOUT; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 714 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 715 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 716 | xpc_connected_callout(ch); |
| 717 | |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 718 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 719 | ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE; |
| 720 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 721 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 722 | /* |
| 723 | * It is possible that while the callout was being |
| 724 | * made that the remote partition sent some messages. |
| 725 | * If that is the case, we may need to activate |
| 726 | * additional kthreads to help deliver them. We only |
| 727 | * need one less than total #of messages to deliver. |
| 728 | */ |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 729 | n_needed = n_of_deliverable_payloads(ch) - 1; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 730 | if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING)) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 731 | xpc_activate_kthreads(ch, n_needed); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 732 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 733 | } else { |
| 734 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 735 | } |
| 736 | |
| 737 | xpc_kthread_waitmsgs(part, ch); |
| 738 | } |
| 739 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 740 | /* let registerer know that connection is disconnecting */ |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 741 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 742 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 743 | if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) && |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 744 | !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) { |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 745 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT; |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 746 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 747 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 748 | xpc_disconnect_callout(ch, xpDisconnecting); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 749 | |
| 750 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 751 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE; |
| 752 | } |
| 753 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 754 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 755 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
| 756 | atomic_dec_return(&part->nchannels_engaged) == 0) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 757 | xpc_arch_ops.indicate_partition_disengaged(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 758 | } |
| 759 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 760 | xpc_msgqueue_deref(ch); |
| 761 | |
| 762 | dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n", |
| 763 | partid, ch_number); |
| 764 | |
| 765 | xpc_part_deref(part); |
| 766 | return 0; |
| 767 | } |
| 768 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 769 | /* |
| 770 | * For each partition that XPC has established communications with, there is |
| 771 | * a minimum of one kernel thread assigned to perform any operation that |
| 772 | * may potentially sleep or block (basically the callouts to the asynchronous |
| 773 | * functions registered via xpc_connect()). |
| 774 | * |
| 775 | * Additional kthreads are created and destroyed by XPC as the workload |
| 776 | * demands. |
| 777 | * |
| 778 | * A kthread is assigned to one of the active channels that exists for a given |
| 779 | * partition. |
| 780 | */ |
| 781 | void |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 782 | xpc_create_kthreads(struct xpc_channel *ch, int needed, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 783 | int ignore_disconnecting) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 784 | { |
| 785 | unsigned long irq_flags; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 786 | u64 args = XPC_PACK_ARGS(ch->partid, ch->number); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 787 | struct xpc_partition *part = &xpc_partitions[ch->partid]; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 788 | struct task_struct *kthread; |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 789 | void (*indicate_partition_disengaged) (struct xpc_partition *) = |
| 790 | xpc_arch_ops.indicate_partition_disengaged; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 791 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 792 | while (needed-- > 0) { |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 793 | |
| 794 | /* |
| 795 | * The following is done on behalf of the newly created |
| 796 | * kthread. That kthread is responsible for doing the |
| 797 | * counterpart to the following before it exits. |
| 798 | */ |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 799 | if (ignore_disconnecting) { |
| 800 | if (!atomic_inc_not_zero(&ch->kthreads_assigned)) { |
| 801 | /* kthreads assigned had gone to zero */ |
| 802 | BUG_ON(!(ch->flags & |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 803 | XPC_C_DISCONNECTINGCALLOUT_MADE)); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 804 | break; |
| 805 | } |
| 806 | |
| 807 | } else if (ch->flags & XPC_C_DISCONNECTING) { |
| 808 | break; |
| 809 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 810 | } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 && |
| 811 | atomic_inc_return(&part->nchannels_engaged) == 1) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 812 | xpc_arch_ops.indicate_partition_engaged(part); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 813 | } |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 814 | (void)xpc_part_ref(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 815 | xpc_msgqueue_ref(ch); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 816 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 817 | kthread = kthread_run(xpc_kthread_start, (void *)args, |
| 818 | "xpc%02dc%d", ch->partid, ch->number); |
| 819 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 820 | /* the fork failed */ |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 821 | |
| 822 | /* |
| 823 | * NOTE: if (ignore_disconnecting && |
| 824 | * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true, |
| 825 | * then we'll deadlock if all other kthreads assigned |
| 826 | * to this channel are blocked in the channel's |
| 827 | * registerer, because the only thing that will unblock |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 828 | * them is the xpDisconnecting callout that this |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 829 | * failed kthread_run() would have made. |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 830 | */ |
| 831 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 832 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
| 833 | atomic_dec_return(&part->nchannels_engaged) == 0) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 834 | indicate_partition_disengaged(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 835 | } |
| 836 | xpc_msgqueue_deref(ch); |
| 837 | xpc_part_deref(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 838 | |
| 839 | if (atomic_read(&ch->kthreads_assigned) < |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 840 | ch->kthreads_idle_limit) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 841 | /* |
| 842 | * Flag this as an error only if we have an |
| 843 | * insufficient #of kthreads for the channel |
| 844 | * to function. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 845 | */ |
| 846 | spin_lock_irqsave(&ch->lock, irq_flags); |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 847 | XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 848 | &irq_flags); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 849 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 850 | } |
| 851 | break; |
| 852 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 853 | } |
| 854 | } |
| 855 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 856 | void |
| 857 | xpc_disconnect_wait(int ch_number) |
| 858 | { |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 859 | unsigned long irq_flags; |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 860 | short partid; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 861 | struct xpc_partition *part; |
| 862 | struct xpc_channel *ch; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 863 | int wakeup_channel_mgr; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 864 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 865 | /* now wait for all callouts to the caller's function to cease */ |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 866 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 867 | part = &xpc_partitions[partid]; |
| 868 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 869 | if (!xpc_part_ref(part)) |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 870 | continue; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 871 | |
| 872 | ch = &part->channels[ch_number]; |
| 873 | |
| 874 | if (!(ch->flags & XPC_C_WDISCONNECT)) { |
| 875 | xpc_part_deref(part); |
| 876 | continue; |
| 877 | } |
| 878 | |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 879 | wait_for_completion(&ch->wdisconnect_wait); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 880 | |
| 881 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 882 | DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED)); |
| 883 | wakeup_channel_mgr = 0; |
| 884 | |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 885 | if (ch->delayed_chctl_flags) { |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 886 | if (part->act_state != XPC_P_AS_DEACTIVATING) { |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 887 | spin_lock(&part->chctl_lock); |
| 888 | part->chctl.flags[ch->number] |= |
| 889 | ch->delayed_chctl_flags; |
| 890 | spin_unlock(&part->chctl_lock); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 891 | wakeup_channel_mgr = 1; |
| 892 | } |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 893 | ch->delayed_chctl_flags = 0; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 894 | } |
| 895 | |
| 896 | ch->flags &= ~XPC_C_WDISCONNECT; |
| 897 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 898 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 899 | if (wakeup_channel_mgr) |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 900 | xpc_wakeup_channel_mgr(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 901 | |
| 902 | xpc_part_deref(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 903 | } |
| 904 | } |
| 905 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 906 | static int |
| 907 | xpc_setup_partitions(void) |
| 908 | { |
| 909 | short partid; |
| 910 | struct xpc_partition *part; |
| 911 | |
| 912 | xpc_partitions = kzalloc(sizeof(struct xpc_partition) * |
| 913 | xp_max_npartitions, GFP_KERNEL); |
| 914 | if (xpc_partitions == NULL) { |
| 915 | dev_err(xpc_part, "can't get memory for partition structure\n"); |
| 916 | return -ENOMEM; |
| 917 | } |
| 918 | |
| 919 | /* |
| 920 | * The first few fields of each entry of xpc_partitions[] need to |
| 921 | * be initialized now so that calls to xpc_connect() and |
| 922 | * xpc_disconnect() can be made prior to the activation of any remote |
| 923 | * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE |
| 924 | * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING |
| 925 | * PARTITION HAS BEEN ACTIVATED. |
| 926 | */ |
| 927 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
| 928 | part = &xpc_partitions[partid]; |
| 929 | |
| 930 | DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part)); |
| 931 | |
| 932 | part->activate_IRQ_rcvd = 0; |
| 933 | spin_lock_init(&part->act_lock); |
| 934 | part->act_state = XPC_P_AS_INACTIVE; |
| 935 | XPC_SET_REASON(part, 0, 0); |
| 936 | |
| 937 | init_timer(&part->disengage_timer); |
| 938 | part->disengage_timer.function = |
| 939 | xpc_timeout_partition_disengage; |
| 940 | part->disengage_timer.data = (unsigned long)part; |
| 941 | |
| 942 | part->setup_state = XPC_P_SS_UNSET; |
| 943 | init_waitqueue_head(&part->teardown_wq); |
| 944 | atomic_set(&part->references, 0); |
| 945 | } |
| 946 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 947 | return xpc_arch_ops.setup_partitions(); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | static void |
| 951 | xpc_teardown_partitions(void) |
| 952 | { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 953 | xpc_arch_ops.teardown_partitions(); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 954 | kfree(xpc_partitions); |
| 955 | } |
| 956 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 957 | static void |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 958 | xpc_do_exit(enum xp_retval reason) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 959 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 960 | short partid; |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 961 | int active_part_count, printed_waiting_msg = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 962 | struct xpc_partition *part; |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 963 | unsigned long printmsg_time, disengage_timeout = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 964 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 965 | /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */ |
| 966 | DBUG_ON(xpc_exiting == 1); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 967 | |
| 968 | /* |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 969 | * Let the heartbeat checker thread and the discovery thread |
| 970 | * (if one is running) know that they should exit. Also wake up |
| 971 | * the heartbeat checker thread in case it's sleeping. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 972 | */ |
| 973 | xpc_exiting = 1; |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 974 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 975 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 976 | /* wait for the discovery thread to exit */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 977 | wait_for_completion(&xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 978 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 979 | /* wait for the heartbeat checker thread to exit */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 980 | wait_for_completion(&xpc_hb_checker_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 981 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 982 | /* sleep for a 1/3 of a second or so */ |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 983 | (void)msleep_interruptible(300); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 984 | |
| 985 | /* wait for all partitions to become inactive */ |
| 986 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 987 | printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
| 988 | xpc_disengage_timedout = 0; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 989 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 990 | do { |
| 991 | active_part_count = 0; |
| 992 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 993 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 994 | part = &xpc_partitions[partid]; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 995 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 996 | if (xpc_partition_disengaged(part) && |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 997 | part->act_state == XPC_P_AS_INACTIVE) { |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 998 | continue; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 999 | } |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1000 | |
| 1001 | active_part_count++; |
| 1002 | |
| 1003 | XPC_DEACTIVATE_PARTITION(part, reason); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1004 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1005 | if (part->disengage_timeout > disengage_timeout) |
| 1006 | disengage_timeout = part->disengage_timeout; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1007 | } |
| 1008 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1009 | if (xpc_arch_ops.any_partition_engaged()) { |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 1010 | if (time_is_before_jiffies(printmsg_time)) { |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1011 | dev_info(xpc_part, "waiting for remote " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1012 | "partitions to deactivate, timeout in " |
| 1013 | "%ld seconds\n", (disengage_timeout - |
| 1014 | jiffies) / HZ); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1015 | printmsg_time = jiffies + |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1016 | (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1017 | printed_waiting_msg = 1; |
| 1018 | } |
| 1019 | |
| 1020 | } else if (active_part_count > 0) { |
| 1021 | if (printed_waiting_msg) { |
| 1022 | dev_info(xpc_part, "waiting for local partition" |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1023 | " to deactivate\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1024 | printed_waiting_msg = 0; |
| 1025 | } |
| 1026 | |
| 1027 | } else { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1028 | if (!xpc_disengage_timedout) { |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1029 | dev_info(xpc_part, "all partitions have " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1030 | "deactivated\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1031 | } |
| 1032 | break; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1033 | } |
| 1034 | |
| 1035 | /* sleep for a 1/3 of a second or so */ |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1036 | (void)msleep_interruptible(300); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1037 | |
| 1038 | } while (1); |
| 1039 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1040 | DBUG_ON(xpc_arch_ops.any_partition_engaged()); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1041 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1042 | xpc_teardown_rsvd_page(); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1043 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1044 | if (reason == xpUnloading) { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1045 | (void)unregister_die_notifier(&xpc_die_notifier); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1046 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | 0752c67 | 2006-01-10 11:07:19 -0600 | [diff] [blame] | 1047 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1048 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1049 | /* clear the interface to XPC's functions */ |
| 1050 | xpc_clear_interface(); |
| 1051 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1052 | if (xpc_sysctl) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1053 | unregister_sysctl_table(xpc_sysctl); |
Dean Nelson | 7682a4c | 2006-08-08 15:03:29 -0500 | [diff] [blame] | 1054 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1055 | xpc_teardown_partitions(); |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1056 | |
| 1057 | if (is_shub()) |
| 1058 | xpc_exit_sn2(); |
Dean Nelson | b7f7b07 | 2008-10-29 14:01:12 -0700 | [diff] [blame] | 1059 | else if (is_uv()) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1060 | xpc_exit_uv(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1061 | } |
| 1062 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1063 | /* |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1064 | * This function is called when the system is being rebooted. |
| 1065 | */ |
| 1066 | static int |
| 1067 | xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused) |
| 1068 | { |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1069 | enum xp_retval reason; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1070 | |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1071 | switch (event) { |
| 1072 | case SYS_RESTART: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1073 | reason = xpSystemReboot; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1074 | break; |
| 1075 | case SYS_HALT: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1076 | reason = xpSystemHalt; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1077 | break; |
| 1078 | case SYS_POWER_OFF: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1079 | reason = xpSystemPoweroff; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1080 | break; |
| 1081 | default: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1082 | reason = xpSystemGoingDown; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | xpc_do_exit(reason); |
| 1086 | return NOTIFY_DONE; |
| 1087 | } |
| 1088 | |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1089 | /* |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1090 | * Notify other partitions to deactivate from us by first disengaging from all |
| 1091 | * references to our memory. |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1092 | */ |
| 1093 | static void |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1094 | xpc_die_deactivate(void) |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1095 | { |
| 1096 | struct xpc_partition *part; |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 1097 | short partid; |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1098 | int any_engaged; |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1099 | long keep_waiting; |
| 1100 | long wait_to_print; |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1101 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1102 | /* keep xpc_hb_checker thread from doing anything (just in case) */ |
| 1103 | xpc_exiting = 1; |
| 1104 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1105 | xpc_arch_ops.disallow_all_hbs(); /*indicate we're deactivated */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1106 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1107 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1108 | part = &xpc_partitions[partid]; |
| 1109 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1110 | if (xpc_arch_ops.partition_engaged(partid) || |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1111 | part->act_state != XPC_P_AS_INACTIVE) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1112 | xpc_arch_ops.request_partition_deactivation(part); |
| 1113 | xpc_arch_ops.indicate_partition_disengaged(part); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1114 | } |
| 1115 | } |
| 1116 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1117 | /* |
| 1118 | * Though we requested that all other partitions deactivate from us, |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1119 | * we only wait until they've all disengaged or we've reached the |
| 1120 | * defined timelimit. |
| 1121 | * |
| 1122 | * Given that one iteration through the following while-loop takes |
| 1123 | * approximately 200 microseconds, calculate the #of loops to take |
| 1124 | * before bailing and the #of loops before printing a waiting message. |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1125 | */ |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1126 | keep_waiting = xpc_disengage_timelimit * 1000 * 5; |
| 1127 | wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5; |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1128 | |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1129 | while (1) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1130 | any_engaged = xpc_arch_ops.any_partition_engaged(); |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1131 | if (!any_engaged) { |
| 1132 | dev_info(xpc_part, "all partitions have deactivated\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1133 | break; |
| 1134 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1135 | |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1136 | if (!keep_waiting--) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1137 | for (partid = 0; partid < xp_max_npartitions; |
| 1138 | partid++) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1139 | if (xpc_arch_ops.partition_engaged(partid)) { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1140 | dev_info(xpc_part, "deactivate from " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1141 | "remote partition %d timed " |
| 1142 | "out\n", partid); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1143 | } |
| 1144 | } |
| 1145 | break; |
| 1146 | } |
| 1147 | |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1148 | if (!wait_to_print--) { |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1149 | dev_info(xpc_part, "waiting for remote partitions to " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1150 | "deactivate, timeout in %ld seconds\n", |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1151 | keep_waiting / (1000 * 5)); |
| 1152 | wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * |
| 1153 | 1000 * 5; |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1154 | } |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1155 | |
| 1156 | udelay(200); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1157 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1158 | } |
| 1159 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1160 | /* |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1161 | * This function is called when the system is being restarted or halted due |
| 1162 | * to some sort of system failure. If this is the case we need to notify the |
| 1163 | * other partitions to disengage from all references to our memory. |
| 1164 | * This function can also be called when our heartbeater could be offlined |
| 1165 | * for a time. In this case we need to notify other partitions to not worry |
| 1166 | * about the lack of a heartbeat. |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1167 | */ |
| 1168 | static int |
| 1169 | xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused) |
| 1170 | { |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1171 | #ifdef CONFIG_IA64 /* !!! temporary kludge */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1172 | switch (event) { |
| 1173 | case DIE_MACHINE_RESTART: |
| 1174 | case DIE_MACHINE_HALT: |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1175 | xpc_die_deactivate(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1176 | break; |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1177 | |
| 1178 | case DIE_KDEBUG_ENTER: |
| 1179 | /* Should lack of heartbeat be ignored by other partitions? */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1180 | if (!xpc_kdebug_ignore) |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1181 | break; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1182 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1183 | /* fall through */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1184 | case DIE_MCA_MONARCH_ENTER: |
| 1185 | case DIE_INIT_MONARCH_ENTER: |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1186 | xpc_arch_ops.offline_heartbeat(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1187 | break; |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1188 | |
| 1189 | case DIE_KDEBUG_LEAVE: |
| 1190 | /* Is lack of heartbeat being ignored by other partitions? */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1191 | if (!xpc_kdebug_ignore) |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1192 | break; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1193 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1194 | /* fall through */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1195 | case DIE_MCA_MONARCH_LEAVE: |
| 1196 | case DIE_INIT_MONARCH_LEAVE: |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1197 | xpc_arch_ops.online_heartbeat(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1198 | break; |
| 1199 | } |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1200 | #else |
| 1201 | xpc_die_deactivate(); |
| 1202 | #endif |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1203 | |
| 1204 | return NOTIFY_DONE; |
| 1205 | } |
| 1206 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1207 | int __init |
| 1208 | xpc_init(void) |
| 1209 | { |
| 1210 | int ret; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1211 | struct task_struct *kthread; |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1212 | |
Kay Sievers | bb0dc43 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 1213 | dev_set_name(xpc_part, "part"); |
| 1214 | dev_set_name(xpc_chan, "chan"); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1215 | |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1216 | if (is_shub()) { |
| 1217 | /* |
| 1218 | * The ia64-sn2 architecture supports at most 64 partitions. |
Dean Nelson | c39838c | 2008-07-29 22:34:11 -0700 | [diff] [blame] | 1219 | * And the inability to unregister remote amos restricts us |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1220 | * further to only support exactly 64 partitions on this |
| 1221 | * architecture, no less. |
| 1222 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1223 | if (xp_max_npartitions != 64) { |
| 1224 | dev_err(xpc_part, "max #of partitions not set to 64\n"); |
| 1225 | ret = -EINVAL; |
| 1226 | } else { |
| 1227 | ret = xpc_init_sn2(); |
| 1228 | } |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1229 | |
| 1230 | } else if (is_uv()) { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1231 | ret = xpc_init_uv(); |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1232 | |
| 1233 | } else { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1234 | ret = -ENODEV; |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1235 | } |
Dean Nelson | 408865c | 2005-09-08 10:46:58 -0500 | [diff] [blame] | 1236 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1237 | if (ret != 0) |
| 1238 | return ret; |
| 1239 | |
| 1240 | ret = xpc_setup_partitions(); |
| 1241 | if (ret != 0) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1242 | dev_err(xpc_part, "can't get memory for partition structure\n"); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1243 | goto out_1; |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1244 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1245 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1246 | xpc_sysctl = register_sysctl_table(xpc_sys_dir); |
| 1247 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1248 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1249 | * Fill the partition reserved page with the information needed by |
| 1250 | * other partitions to discover we are alive and establish initial |
| 1251 | * communications. |
| 1252 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1253 | ret = xpc_setup_rsvd_page(); |
| 1254 | if (ret != 0) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1255 | dev_err(xpc_part, "can't setup our reserved page\n"); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1256 | goto out_2; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1257 | } |
| 1258 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1259 | /* add ourselves to the reboot_notifier_list */ |
| 1260 | ret = register_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1261 | if (ret != 0) |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1262 | dev_warn(xpc_part, "can't register reboot notifier\n"); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1263 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 1264 | /* add ourselves to the die_notifier list */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1265 | ret = register_die_notifier(&xpc_die_notifier); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1266 | if (ret != 0) |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1267 | dev_warn(xpc_part, "can't register die notifier\n"); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1268 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1269 | /* |
| 1270 | * The real work-horse behind xpc. This processes incoming |
| 1271 | * interrupts and monitors remote heartbeats. |
| 1272 | */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1273 | kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME); |
| 1274 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1275 | dev_err(xpc_part, "failed while forking hb check thread\n"); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1276 | ret = -EBUSY; |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1277 | goto out_3; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1278 | } |
| 1279 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1280 | /* |
| 1281 | * Startup a thread that will attempt to discover other partitions to |
| 1282 | * activate based on info provided by SAL. This new thread is short |
| 1283 | * lived and will exit once discovery is complete. |
| 1284 | */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1285 | kthread = kthread_run(xpc_initiate_discovery, NULL, |
| 1286 | XPC_DISCOVERY_THREAD_NAME); |
| 1287 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1288 | dev_err(xpc_part, "failed while forking discovery thread\n"); |
| 1289 | |
| 1290 | /* mark this new thread as a non-starter */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 1291 | complete(&xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1292 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1293 | xpc_do_exit(xpUnloading); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1294 | return -EBUSY; |
| 1295 | } |
| 1296 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1297 | /* set the interface to point at XPC's functions */ |
| 1298 | xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect, |
Dean Nelson | 97bf1aa | 2008-07-29 22:34:08 -0700 | [diff] [blame] | 1299 | xpc_initiate_send, xpc_initiate_send_notify, |
| 1300 | xpc_initiate_received, xpc_initiate_partid_to_nasids); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1301 | |
| 1302 | return 0; |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1303 | |
| 1304 | /* initialization was not successful */ |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1305 | out_3: |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1306 | xpc_teardown_rsvd_page(); |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1307 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1308 | (void)unregister_die_notifier(&xpc_die_notifier); |
| 1309 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1310 | out_2: |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1311 | if (xpc_sysctl) |
| 1312 | unregister_sysctl_table(xpc_sysctl); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1313 | |
| 1314 | xpc_teardown_partitions(); |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1315 | out_1: |
| 1316 | if (is_shub()) |
| 1317 | xpc_exit_sn2(); |
Dean Nelson | b7f7b07 | 2008-10-29 14:01:12 -0700 | [diff] [blame] | 1318 | else if (is_uv()) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1319 | xpc_exit_uv(); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1320 | return ret; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1321 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1322 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1323 | module_init(xpc_init); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1324 | |
| 1325 | void __exit |
| 1326 | xpc_exit(void) |
| 1327 | { |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1328 | xpc_do_exit(xpUnloading); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1329 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1330 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1331 | module_exit(xpc_exit); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1332 | |
| 1333 | MODULE_AUTHOR("Silicon Graphics, Inc."); |
| 1334 | MODULE_DESCRIPTION("Cross Partition Communication (XPC) support"); |
| 1335 | MODULE_LICENSE("GPL"); |
| 1336 | |
| 1337 | module_param(xpc_hb_interval, int, 0); |
| 1338 | MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1339 | "heartbeat increments."); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1340 | |
| 1341 | module_param(xpc_hb_check_interval, int, 0); |
| 1342 | MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1343 | "heartbeat checks."); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1344 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1345 | module_param(xpc_disengage_timelimit, int, 0); |
| 1346 | MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait " |
| 1347 | "for disengage to complete."); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 1348 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1349 | module_param(xpc_kdebug_ignore, int, 0); |
| 1350 | MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1351 | "other partitions when dropping into kdebug."); |