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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 47 | #include <linux/slab.h> |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 48 | #include <linux/sysctl.h> |
| 49 | #include <linux/device.h> |
Nishanth Aravamudan | 6991392 | 2005-07-08 17:10:00 -0700 | [diff] [blame] | 50 | #include <linux/delay.h> |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 51 | #include <linux/reboot.h> |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 52 | #include <linux/kdebug.h> |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 53 | #include <linux/kthread.h> |
Dean Nelson | 45d9ca4 | 2008-04-22 14:46:56 -0500 | [diff] [blame] | 54 | #include "xpc.h" |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 55 | |
Robin Holt | 891348c | 2012-12-20 15:05:50 -0800 | [diff] [blame] | 56 | #ifdef CONFIG_X86_64 |
| 57 | #include <asm/traps.h> |
| 58 | #endif |
| 59 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 60 | /* define two XPC debug device structures to be used with dev_dbg() et al */ |
| 61 | |
| 62 | struct device_driver xpc_dbg_name = { |
| 63 | .name = "xpc" |
| 64 | }; |
| 65 | |
| 66 | struct device xpc_part_dbg_subname = { |
Kay Sievers | bb0dc43 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 67 | .init_name = "", /* set to "part" 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_chan_dbg_subname = { |
Kay Sievers | bb0dc43 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 72 | .init_name = "", /* set to "chan" at xpc_init() time */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 73 | .driver = &xpc_dbg_name |
| 74 | }; |
| 75 | |
| 76 | struct device *xpc_part = &xpc_part_dbg_subname; |
| 77 | struct device *xpc_chan = &xpc_chan_dbg_subname; |
| 78 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 79 | static int xpc_kdebug_ignore; |
| 80 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 81 | /* systune related variables for /proc/sys directories */ |
| 82 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 83 | static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL; |
| 84 | static int xpc_hb_min_interval = 1; |
| 85 | static int xpc_hb_max_interval = 10; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 86 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 87 | static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL; |
| 88 | static int xpc_hb_check_min_interval = 10; |
| 89 | static int xpc_hb_check_max_interval = 120; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 90 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 91 | int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT; |
| 92 | static int xpc_disengage_min_timelimit; /* = 0 */ |
| 93 | static int xpc_disengage_max_timelimit = 120; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 94 | |
Joe Perches | f0b7655 | 2013-06-13 19:37:39 -0700 | [diff] [blame] | 95 | static struct ctl_table xpc_sys_xpc_hb_dir[] = { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 96 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 97 | .procname = "hb_interval", |
| 98 | .data = &xpc_hb_interval, |
| 99 | .maxlen = sizeof(int), |
| 100 | .mode = 0644, |
Eric W. Biederman | 6d45611 | 2009-11-16 03:11:48 -0800 | [diff] [blame] | 101 | .proc_handler = proc_dointvec_minmax, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 102 | .extra1 = &xpc_hb_min_interval, |
| 103 | .extra2 = &xpc_hb_max_interval}, |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 104 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 105 | .procname = "hb_check_interval", |
| 106 | .data = &xpc_hb_check_interval, |
| 107 | .maxlen = sizeof(int), |
| 108 | .mode = 0644, |
Eric W. Biederman | 6d45611 | 2009-11-16 03:11:48 -0800 | [diff] [blame] | 109 | .proc_handler = proc_dointvec_minmax, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 110 | .extra1 = &xpc_hb_check_min_interval, |
| 111 | .extra2 = &xpc_hb_check_max_interval}, |
Eric W. Biederman | 68cbf07 | 2007-02-14 00:33:41 -0800 | [diff] [blame] | 112 | {} |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 113 | }; |
Joe Perches | f0b7655 | 2013-06-13 19:37:39 -0700 | [diff] [blame] | 114 | static struct ctl_table xpc_sys_xpc_dir[] = { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 115 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 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 | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 120 | .procname = "disengage_timelimit", |
| 121 | .data = &xpc_disengage_timelimit, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 122 | .maxlen = sizeof(int), |
| 123 | .mode = 0644, |
Eric W. Biederman | 6d45611 | 2009-11-16 03:11:48 -0800 | [diff] [blame] | 124 | .proc_handler = proc_dointvec_minmax, |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 125 | .extra1 = &xpc_disengage_min_timelimit, |
| 126 | .extra2 = &xpc_disengage_max_timelimit}, |
Eric W. Biederman | 68cbf07 | 2007-02-14 00:33:41 -0800 | [diff] [blame] | 127 | {} |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 128 | }; |
Joe Perches | f0b7655 | 2013-06-13 19:37:39 -0700 | [diff] [blame] | 129 | static struct ctl_table xpc_sys_dir[] = { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 130 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 131 | .procname = "xpc", |
| 132 | .mode = 0555, |
| 133 | .child = xpc_sys_xpc_dir}, |
Eric W. Biederman | 68cbf07 | 2007-02-14 00:33:41 -0800 | [diff] [blame] | 134 | {} |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 135 | }; |
| 136 | static struct ctl_table_header *xpc_sysctl; |
| 137 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 138 | /* non-zero if any remote partition disengage was timed out */ |
| 139 | int xpc_disengage_timedout; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 140 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 141 | /* #of activate IRQs received and not yet processed */ |
| 142 | int xpc_activate_IRQ_rcvd; |
| 143 | DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 144 | |
| 145 | /* IRQ handler notifies this wait queue on receipt of an IRQ */ |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 146 | DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 147 | |
| 148 | static unsigned long xpc_hb_check_timeout; |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 149 | static struct timer_list xpc_hb_timer; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 150 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 151 | /* notification that the xpc_hb_checker thread has exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 152 | static DECLARE_COMPLETION(xpc_hb_checker_exited); |
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_discovery thread has exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 155 | static DECLARE_COMPLETION(xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 156 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 157 | static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *); |
| 158 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 159 | static int xpc_system_reboot(struct notifier_block *, unsigned long, void *); |
| 160 | static struct notifier_block xpc_reboot_notifier = { |
| 161 | .notifier_call = xpc_system_reboot, |
| 162 | }; |
| 163 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 164 | static int xpc_system_die(struct notifier_block *, unsigned long, void *); |
| 165 | static struct notifier_block xpc_die_notifier = { |
| 166 | .notifier_call = xpc_system_die, |
| 167 | }; |
| 168 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 169 | struct xpc_arch_operations xpc_arch_ops; |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 170 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 171 | /* |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 172 | * Timer function to enforce the timelimit on the partition disengage. |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 173 | */ |
| 174 | static void |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 175 | xpc_timeout_partition_disengage(unsigned long data) |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 176 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 177 | struct xpc_partition *part = (struct xpc_partition *)data; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 178 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 179 | DBUG_ON(time_is_after_jiffies(part->disengage_timeout)); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 180 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 181 | (void)xpc_partition_disengaged(part); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 182 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 183 | DBUG_ON(part->disengage_timeout != 0); |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 184 | DBUG_ON(xpc_arch_ops.partition_engaged(XPC_PARTID(part))); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 185 | } |
| 186 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 187 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 188 | * Timer to produce the heartbeat. The timer structures function is |
| 189 | * already set when this is initially called. A tunable is used to |
| 190 | * specify when the next timeout should occur. |
| 191 | */ |
| 192 | static void |
| 193 | xpc_hb_beater(unsigned long dummy) |
| 194 | { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 195 | xpc_arch_ops.increment_heartbeat(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 196 | |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 197 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 198 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 199 | |
| 200 | xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ); |
| 201 | add_timer(&xpc_hb_timer); |
| 202 | } |
| 203 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 204 | static void |
| 205 | xpc_start_hb_beater(void) |
| 206 | { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 207 | xpc_arch_ops.heartbeat_init(); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 208 | init_timer(&xpc_hb_timer); |
| 209 | xpc_hb_timer.function = xpc_hb_beater; |
| 210 | xpc_hb_beater(0); |
| 211 | } |
| 212 | |
| 213 | static void |
| 214 | xpc_stop_hb_beater(void) |
| 215 | { |
| 216 | del_timer_sync(&xpc_hb_timer); |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 217 | xpc_arch_ops.heartbeat_exit(); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 218 | } |
| 219 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 220 | /* |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 221 | * At periodic intervals, scan through all active partitions and ensure |
| 222 | * their heartbeat is still active. If not, the partition is deactivated. |
| 223 | */ |
| 224 | static void |
| 225 | xpc_check_remote_hb(void) |
| 226 | { |
| 227 | struct xpc_partition *part; |
| 228 | short partid; |
| 229 | enum xp_retval ret; |
| 230 | |
| 231 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
| 232 | |
| 233 | if (xpc_exiting) |
| 234 | break; |
| 235 | |
| 236 | if (partid == xp_partition_id) |
| 237 | continue; |
| 238 | |
| 239 | part = &xpc_partitions[partid]; |
| 240 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 241 | if (part->act_state == XPC_P_AS_INACTIVE || |
| 242 | part->act_state == XPC_P_AS_DEACTIVATING) { |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 243 | continue; |
| 244 | } |
| 245 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 246 | ret = xpc_arch_ops.get_remote_heartbeat(part); |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 247 | if (ret != xpSuccess) |
| 248 | XPC_DEACTIVATE_PARTITION(part, ret); |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 253 | * This thread is responsible for nearly all of the partition |
| 254 | * activation/deactivation. |
| 255 | */ |
| 256 | static int |
| 257 | xpc_hb_checker(void *ignore) |
| 258 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 259 | int force_IRQ = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 260 | |
| 261 | /* this thread was marked active by xpc_hb_init() */ |
| 262 | |
Rusty Russell | f7df8ed | 2009-01-10 21:58:09 -0800 | [diff] [blame] | 263 | set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 264 | |
Dean Nelson | 4c013f5 | 2007-11-07 07:53:06 -0600 | [diff] [blame] | 265 | /* set our heartbeating to other partitions into motion */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 266 | xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 267 | xpc_start_hb_beater(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 268 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 269 | while (!xpc_exiting) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 270 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 271 | dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have " |
| 272 | "been received\n", |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 273 | (int)(xpc_hb_check_timeout - jiffies), |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 274 | xpc_activate_IRQ_rcvd); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 275 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 276 | /* checking of remote heartbeats is skewed by IRQ handling */ |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 277 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 278 | xpc_hb_check_timeout = jiffies + |
| 279 | (xpc_hb_check_interval * HZ); |
| 280 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 281 | dev_dbg(xpc_part, "checking remote heartbeats\n"); |
| 282 | xpc_check_remote_hb(); |
| 283 | |
| 284 | /* |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 285 | * On sn2 we need to periodically recheck to ensure no |
| 286 | * IRQ/amo pairs have been missed. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 287 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 288 | if (is_shub()) |
| 289 | force_IRQ = 1; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 290 | } |
| 291 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 292 | /* check for outstanding IRQs */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 293 | if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 294 | force_IRQ = 0; |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 295 | dev_dbg(xpc_part, "processing activate IRQs " |
| 296 | "received\n"); |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 297 | xpc_arch_ops.process_activate_IRQ_rcvd(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 298 | } |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 299 | |
| 300 | /* wait for IRQ or timeout */ |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 301 | (void)wait_event_interruptible(xpc_activate_IRQ_wq, |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 302 | (time_is_before_eq_jiffies( |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 303 | xpc_hb_check_timeout) || |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 304 | xpc_activate_IRQ_rcvd > 0 || |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 305 | xpc_exiting)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 306 | } |
| 307 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 308 | xpc_stop_hb_beater(); |
| 309 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 310 | dev_dbg(xpc_part, "heartbeat checker is exiting\n"); |
| 311 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 312 | /* mark this thread as having exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 313 | complete(&xpc_hb_checker_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 314 | return 0; |
| 315 | } |
| 316 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 317 | /* |
| 318 | * This thread will attempt to discover other partitions to activate |
| 319 | * based on info provided by SAL. This new thread is short lived and |
| 320 | * will exit once discovery is complete. |
| 321 | */ |
| 322 | static int |
| 323 | xpc_initiate_discovery(void *ignore) |
| 324 | { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 325 | xpc_discovery(); |
| 326 | |
| 327 | dev_dbg(xpc_part, "discovery thread is exiting\n"); |
| 328 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 329 | /* mark this thread as having exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 330 | complete(&xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 331 | return 0; |
| 332 | } |
| 333 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 334 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 335 | * The first kthread assigned to a newly activated partition is the one |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 336 | * 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] | 337 | * that kthread until the partition is brought down, at which time that kthread |
| 338 | * returns back to XPC HB. (The return of that kthread will signify to XPC HB |
| 339 | * that XPC has dismantled all communication infrastructure for the associated |
| 340 | * partition.) This kthread becomes the channel manager for that partition. |
| 341 | * |
| 342 | * Each active partition has a channel manager, who, besides connecting and |
| 343 | * disconnecting channels, will ensure that each of the partition's connected |
| 344 | * channels has the required number of assigned kthreads to get the work done. |
| 345 | */ |
| 346 | static void |
| 347 | xpc_channel_mgr(struct xpc_partition *part) |
| 348 | { |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 349 | while (part->act_state != XPC_P_AS_DEACTIVATING || |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 350 | atomic_read(&part->nchannels_active) > 0 || |
| 351 | !xpc_partition_disengaged(part)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 352 | |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 353 | xpc_process_sent_chctl_flags(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 354 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 355 | /* |
| 356 | * Wait until we've been requested to activate kthreads or |
| 357 | * all of the channel's message queues have been torn down or |
| 358 | * a signal is pending. |
| 359 | * |
| 360 | * The channel_mgr_requests is set to 1 after being awakened, |
| 361 | * This is done to prevent the channel mgr from making one pass |
| 362 | * through the loop for each request, since he will |
| 363 | * be servicing all the requests in one pass. The reason it's |
| 364 | * set to 1 instead of 0 is so that other kthreads will know |
| 365 | * that the channel mgr is running and won't bother trying to |
| 366 | * wake him up. |
| 367 | */ |
| 368 | atomic_dec(&part->channel_mgr_requests); |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 369 | (void)wait_event_interruptible(part->channel_mgr_wq, |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 370 | (atomic_read(&part->channel_mgr_requests) > 0 || |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 371 | part->chctl.all_flags != 0 || |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 372 | (part->act_state == XPC_P_AS_DEACTIVATING && |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 373 | atomic_read(&part->nchannels_active) == 0 && |
| 374 | xpc_partition_disengaged(part)))); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 375 | atomic_set(&part->channel_mgr_requests, 1); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 376 | } |
| 377 | } |
| 378 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 379 | /* |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 380 | * Guarantee that the kzalloc'd memory is cacheline aligned. |
| 381 | */ |
| 382 | void * |
| 383 | xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base) |
| 384 | { |
| 385 | /* see if kzalloc will give us cachline aligned memory by default */ |
| 386 | *base = kzalloc(size, flags); |
| 387 | if (*base == NULL) |
| 388 | return NULL; |
| 389 | |
| 390 | if ((u64)*base == L1_CACHE_ALIGN((u64)*base)) |
| 391 | return *base; |
| 392 | |
| 393 | kfree(*base); |
| 394 | |
| 395 | /* nope, we'll have to do it ourselves */ |
| 396 | *base = kzalloc(size + L1_CACHE_BYTES, flags); |
| 397 | if (*base == NULL) |
| 398 | return NULL; |
| 399 | |
| 400 | return (void *)L1_CACHE_ALIGN((u64)*base); |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Setup the channel structures necessary to support XPartition Communication |
| 405 | * between the specified remote partition and the local one. |
| 406 | */ |
| 407 | static enum xp_retval |
| 408 | xpc_setup_ch_structures(struct xpc_partition *part) |
| 409 | { |
| 410 | enum xp_retval ret; |
| 411 | int ch_number; |
| 412 | struct xpc_channel *ch; |
| 413 | short partid = XPC_PARTID(part); |
| 414 | |
| 415 | /* |
| 416 | * Allocate all of the channel structures as a contiguous chunk of |
| 417 | * memory. |
| 418 | */ |
| 419 | DBUG_ON(part->channels != NULL); |
| 420 | part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS, |
| 421 | GFP_KERNEL); |
| 422 | if (part->channels == NULL) { |
| 423 | dev_err(xpc_chan, "can't get memory for channels\n"); |
| 424 | return xpNoMemory; |
| 425 | } |
| 426 | |
| 427 | /* allocate the remote open and close args */ |
| 428 | |
| 429 | part->remote_openclose_args = |
| 430 | xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, |
| 431 | GFP_KERNEL, &part-> |
| 432 | remote_openclose_args_base); |
| 433 | if (part->remote_openclose_args == NULL) { |
| 434 | dev_err(xpc_chan, "can't get memory for remote connect args\n"); |
| 435 | ret = xpNoMemory; |
| 436 | goto out_1; |
| 437 | } |
| 438 | |
| 439 | part->chctl.all_flags = 0; |
| 440 | spin_lock_init(&part->chctl_lock); |
| 441 | |
| 442 | atomic_set(&part->channel_mgr_requests, 1); |
| 443 | init_waitqueue_head(&part->channel_mgr_wq); |
| 444 | |
| 445 | part->nchannels = XPC_MAX_NCHANNELS; |
| 446 | |
| 447 | atomic_set(&part->nchannels_active, 0); |
| 448 | atomic_set(&part->nchannels_engaged, 0); |
| 449 | |
| 450 | for (ch_number = 0; ch_number < part->nchannels; ch_number++) { |
| 451 | ch = &part->channels[ch_number]; |
| 452 | |
| 453 | ch->partid = partid; |
| 454 | ch->number = ch_number; |
| 455 | ch->flags = XPC_C_DISCONNECTED; |
| 456 | |
| 457 | atomic_set(&ch->kthreads_assigned, 0); |
| 458 | atomic_set(&ch->kthreads_idle, 0); |
| 459 | atomic_set(&ch->kthreads_active, 0); |
| 460 | |
| 461 | atomic_set(&ch->references, 0); |
| 462 | atomic_set(&ch->n_to_notify, 0); |
| 463 | |
| 464 | spin_lock_init(&ch->lock); |
| 465 | init_completion(&ch->wdisconnect_wait); |
| 466 | |
| 467 | atomic_set(&ch->n_on_msg_allocate_wq, 0); |
| 468 | init_waitqueue_head(&ch->msg_allocate_wq); |
| 469 | init_waitqueue_head(&ch->idle_wq); |
| 470 | } |
| 471 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 472 | ret = xpc_arch_ops.setup_ch_structures(part); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 473 | if (ret != xpSuccess) |
| 474 | goto out_2; |
| 475 | |
| 476 | /* |
| 477 | * With the setting of the partition setup_state to XPC_P_SS_SETUP, |
| 478 | * we're declaring that this partition is ready to go. |
| 479 | */ |
| 480 | part->setup_state = XPC_P_SS_SETUP; |
| 481 | |
| 482 | return xpSuccess; |
| 483 | |
| 484 | /* setup of ch structures failed */ |
| 485 | out_2: |
| 486 | kfree(part->remote_openclose_args_base); |
| 487 | part->remote_openclose_args = NULL; |
| 488 | out_1: |
| 489 | kfree(part->channels); |
| 490 | part->channels = NULL; |
| 491 | return ret; |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * Teardown the channel structures necessary to support XPartition Communication |
| 496 | * between the specified remote partition and the local one. |
| 497 | */ |
| 498 | static void |
| 499 | xpc_teardown_ch_structures(struct xpc_partition *part) |
| 500 | { |
| 501 | DBUG_ON(atomic_read(&part->nchannels_engaged) != 0); |
| 502 | DBUG_ON(atomic_read(&part->nchannels_active) != 0); |
| 503 | |
| 504 | /* |
| 505 | * Make this partition inaccessible to local processes by marking it |
| 506 | * as no longer setup. Then wait before proceeding with the teardown |
| 507 | * until all existing references cease. |
| 508 | */ |
| 509 | DBUG_ON(part->setup_state != XPC_P_SS_SETUP); |
| 510 | part->setup_state = XPC_P_SS_WTEARDOWN; |
| 511 | |
| 512 | wait_event(part->teardown_wq, (atomic_read(&part->references) == 0)); |
| 513 | |
| 514 | /* now we can begin tearing down the infrastructure */ |
| 515 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 516 | xpc_arch_ops.teardown_ch_structures(part); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 517 | |
| 518 | kfree(part->remote_openclose_args_base); |
| 519 | part->remote_openclose_args = NULL; |
| 520 | kfree(part->channels); |
| 521 | part->channels = NULL; |
| 522 | |
| 523 | part->setup_state = XPC_P_SS_TORNDOWN; |
| 524 | } |
| 525 | |
| 526 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 527 | * When XPC HB determines that a partition has come up, it will create a new |
| 528 | * kthread and that kthread will call this function to attempt to set up the |
| 529 | * basic infrastructure used for Cross Partition Communication with the newly |
| 530 | * upped partition. |
| 531 | * |
| 532 | * 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] | 533 | * infrastructure will remain assigned to the partition becoming the channel |
| 534 | * manager for that partition until the partition is deactivating, at which |
| 535 | * time the kthread will teardown the XPC infrastructure and then exit. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 536 | */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 537 | static int |
| 538 | xpc_activating(void *__partid) |
| 539 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 540 | short partid = (u64)__partid; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 541 | struct xpc_partition *part = &xpc_partitions[partid]; |
| 542 | unsigned long irq_flags; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 543 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 544 | DBUG_ON(partid < 0 || partid >= xp_max_npartitions); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 545 | |
| 546 | spin_lock_irqsave(&part->act_lock, irq_flags); |
| 547 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 548 | if (part->act_state == XPC_P_AS_DEACTIVATING) { |
| 549 | part->act_state = XPC_P_AS_INACTIVE; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 550 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 551 | part->remote_rp_pa = 0; |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | /* indicate the thread is activating */ |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 556 | DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ); |
| 557 | part->act_state = XPC_P_AS_ACTIVATING; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 558 | |
| 559 | XPC_SET_REASON(part, 0, 0); |
| 560 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 561 | |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 562 | dev_dbg(xpc_part, "activating partition %d\n", partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 563 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 564 | xpc_arch_ops.allow_hb(partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 565 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 566 | if (xpc_setup_ch_structures(part) == xpSuccess) { |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 567 | (void)xpc_part_ref(part); /* this will always succeed */ |
| 568 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 569 | if (xpc_arch_ops.make_first_contact(part) == xpSuccess) { |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 570 | xpc_mark_partition_active(part); |
| 571 | xpc_channel_mgr(part); |
| 572 | /* won't return until partition is deactivating */ |
| 573 | } |
| 574 | |
| 575 | xpc_part_deref(part); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 576 | xpc_teardown_ch_structures(part); |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 577 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 578 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 579 | xpc_arch_ops.disallow_hb(partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 580 | xpc_mark_partition_inactive(part); |
| 581 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 582 | if (part->reason == xpReactivating) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 583 | /* interrupting ourselves results in activating partition */ |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 584 | xpc_arch_ops.request_partition_reactivation(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 585 | } |
| 586 | |
| 587 | return 0; |
| 588 | } |
| 589 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 590 | void |
| 591 | xpc_activate_partition(struct xpc_partition *part) |
| 592 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 593 | short partid = XPC_PARTID(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 594 | unsigned long irq_flags; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 595 | struct task_struct *kthread; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 596 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 597 | spin_lock_irqsave(&part->act_lock, irq_flags); |
| 598 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 599 | DBUG_ON(part->act_state != XPC_P_AS_INACTIVE); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 600 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 601 | part->act_state = XPC_P_AS_ACTIVATION_REQ; |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 602 | XPC_SET_REASON(part, xpCloneKThread, __LINE__); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 603 | |
| 604 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 605 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 606 | kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d", |
| 607 | partid); |
| 608 | if (IS_ERR(kthread)) { |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 609 | spin_lock_irqsave(&part->act_lock, irq_flags); |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 610 | part->act_state = XPC_P_AS_INACTIVE; |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 611 | XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__); |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 612 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 613 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 614 | } |
| 615 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 616 | void |
| 617 | xpc_activate_kthreads(struct xpc_channel *ch, int needed) |
| 618 | { |
| 619 | int idle = atomic_read(&ch->kthreads_idle); |
| 620 | int assigned = atomic_read(&ch->kthreads_assigned); |
| 621 | int wakeup; |
| 622 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 623 | DBUG_ON(needed <= 0); |
| 624 | |
| 625 | if (idle > 0) { |
| 626 | wakeup = (needed > idle) ? idle : needed; |
| 627 | needed -= wakeup; |
| 628 | |
| 629 | dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, " |
| 630 | "channel=%d\n", wakeup, ch->partid, ch->number); |
| 631 | |
| 632 | /* only wakeup the requested number of kthreads */ |
| 633 | wake_up_nr(&ch->idle_wq, wakeup); |
| 634 | } |
| 635 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 636 | if (needed <= 0) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 637 | return; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 638 | |
| 639 | if (needed + assigned > ch->kthreads_assigned_limit) { |
| 640 | needed = ch->kthreads_assigned_limit - assigned; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 641 | if (needed <= 0) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 642 | return; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 643 | } |
| 644 | |
| 645 | dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n", |
| 646 | needed, ch->partid, ch->number); |
| 647 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 648 | xpc_create_kthreads(ch, needed, 0); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 649 | } |
| 650 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 651 | /* |
| 652 | * This function is where XPC's kthreads wait for messages to deliver. |
| 653 | */ |
| 654 | static void |
| 655 | xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch) |
| 656 | { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 657 | int (*n_of_deliverable_payloads) (struct xpc_channel *) = |
| 658 | xpc_arch_ops.n_of_deliverable_payloads; |
| 659 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 660 | do { |
| 661 | /* deliver messages to their intended recipients */ |
| 662 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 663 | while (n_of_deliverable_payloads(ch) > 0 && |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 664 | !(ch->flags & XPC_C_DISCONNECTING)) { |
Dean Nelson | bd3e64c | 2008-07-29 22:34:19 -0700 | [diff] [blame] | 665 | xpc_deliver_payload(ch); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 666 | } |
| 667 | |
| 668 | if (atomic_inc_return(&ch->kthreads_idle) > |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 669 | ch->kthreads_idle_limit) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 670 | /* too many idle kthreads on this channel */ |
| 671 | atomic_dec(&ch->kthreads_idle); |
| 672 | break; |
| 673 | } |
| 674 | |
| 675 | dev_dbg(xpc_chan, "idle kthread calling " |
| 676 | "wait_event_interruptible_exclusive()\n"); |
| 677 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 678 | (void)wait_event_interruptible_exclusive(ch->idle_wq, |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 679 | (n_of_deliverable_payloads(ch) > 0 || |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 680 | (ch->flags & XPC_C_DISCONNECTING))); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 681 | |
| 682 | atomic_dec(&ch->kthreads_idle); |
| 683 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 684 | } while (!(ch->flags & XPC_C_DISCONNECTING)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 685 | } |
| 686 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 687 | static int |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 688 | xpc_kthread_start(void *args) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 689 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 690 | short partid = XPC_UNPACK_ARG1(args); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 691 | u16 ch_number = XPC_UNPACK_ARG2(args); |
| 692 | struct xpc_partition *part = &xpc_partitions[partid]; |
| 693 | struct xpc_channel *ch; |
| 694 | int n_needed; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 695 | unsigned long irq_flags; |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 696 | int (*n_of_deliverable_payloads) (struct xpc_channel *) = |
| 697 | xpc_arch_ops.n_of_deliverable_payloads; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 698 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 699 | dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n", |
| 700 | partid, ch_number); |
| 701 | |
| 702 | ch = &part->channels[ch_number]; |
| 703 | |
| 704 | if (!(ch->flags & XPC_C_DISCONNECTING)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 705 | |
| 706 | /* let registerer know that connection has been established */ |
| 707 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 708 | spin_lock_irqsave(&ch->lock, irq_flags); |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 709 | if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) { |
| 710 | ch->flags |= XPC_C_CONNECTEDCALLOUT; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 711 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 712 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 713 | xpc_connected_callout(ch); |
| 714 | |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 715 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 716 | ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE; |
| 717 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 718 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 719 | /* |
| 720 | * It is possible that while the callout was being |
| 721 | * made that the remote partition sent some messages. |
| 722 | * If that is the case, we may need to activate |
| 723 | * additional kthreads to help deliver them. We only |
| 724 | * need one less than total #of messages to deliver. |
| 725 | */ |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 726 | n_needed = n_of_deliverable_payloads(ch) - 1; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 727 | if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING)) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 728 | xpc_activate_kthreads(ch, n_needed); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 729 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 730 | } else { |
| 731 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 732 | } |
| 733 | |
| 734 | xpc_kthread_waitmsgs(part, ch); |
| 735 | } |
| 736 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 737 | /* let registerer know that connection is disconnecting */ |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 738 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 739 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 740 | if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) && |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 741 | !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) { |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 742 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT; |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 743 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 744 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 745 | xpc_disconnect_callout(ch, xpDisconnecting); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 746 | |
| 747 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 748 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE; |
| 749 | } |
| 750 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 751 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 752 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
| 753 | atomic_dec_return(&part->nchannels_engaged) == 0) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 754 | xpc_arch_ops.indicate_partition_disengaged(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 755 | } |
| 756 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 757 | xpc_msgqueue_deref(ch); |
| 758 | |
| 759 | dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n", |
| 760 | partid, ch_number); |
| 761 | |
| 762 | xpc_part_deref(part); |
| 763 | return 0; |
| 764 | } |
| 765 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 766 | /* |
| 767 | * For each partition that XPC has established communications with, there is |
| 768 | * a minimum of one kernel thread assigned to perform any operation that |
| 769 | * may potentially sleep or block (basically the callouts to the asynchronous |
| 770 | * functions registered via xpc_connect()). |
| 771 | * |
| 772 | * Additional kthreads are created and destroyed by XPC as the workload |
| 773 | * demands. |
| 774 | * |
| 775 | * A kthread is assigned to one of the active channels that exists for a given |
| 776 | * partition. |
| 777 | */ |
| 778 | void |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 779 | xpc_create_kthreads(struct xpc_channel *ch, int needed, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 780 | int ignore_disconnecting) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 781 | { |
| 782 | unsigned long irq_flags; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 783 | u64 args = XPC_PACK_ARGS(ch->partid, ch->number); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 784 | struct xpc_partition *part = &xpc_partitions[ch->partid]; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 785 | struct task_struct *kthread; |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 786 | void (*indicate_partition_disengaged) (struct xpc_partition *) = |
| 787 | xpc_arch_ops.indicate_partition_disengaged; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 788 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 789 | while (needed-- > 0) { |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 790 | |
| 791 | /* |
| 792 | * The following is done on behalf of the newly created |
| 793 | * kthread. That kthread is responsible for doing the |
| 794 | * counterpart to the following before it exits. |
| 795 | */ |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 796 | if (ignore_disconnecting) { |
| 797 | if (!atomic_inc_not_zero(&ch->kthreads_assigned)) { |
| 798 | /* kthreads assigned had gone to zero */ |
| 799 | BUG_ON(!(ch->flags & |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 800 | XPC_C_DISCONNECTINGCALLOUT_MADE)); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 801 | break; |
| 802 | } |
| 803 | |
| 804 | } else if (ch->flags & XPC_C_DISCONNECTING) { |
| 805 | break; |
| 806 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 807 | } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 && |
| 808 | atomic_inc_return(&part->nchannels_engaged) == 1) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 809 | xpc_arch_ops.indicate_partition_engaged(part); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 810 | } |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 811 | (void)xpc_part_ref(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 812 | xpc_msgqueue_ref(ch); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 813 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 814 | kthread = kthread_run(xpc_kthread_start, (void *)args, |
| 815 | "xpc%02dc%d", ch->partid, ch->number); |
| 816 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 817 | /* the fork failed */ |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 818 | |
| 819 | /* |
| 820 | * NOTE: if (ignore_disconnecting && |
| 821 | * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true, |
| 822 | * then we'll deadlock if all other kthreads assigned |
| 823 | * to this channel are blocked in the channel's |
| 824 | * registerer, because the only thing that will unblock |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 825 | * them is the xpDisconnecting callout that this |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 826 | * failed kthread_run() would have made. |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 827 | */ |
| 828 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 829 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
| 830 | atomic_dec_return(&part->nchannels_engaged) == 0) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 831 | indicate_partition_disengaged(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 832 | } |
| 833 | xpc_msgqueue_deref(ch); |
| 834 | xpc_part_deref(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 835 | |
| 836 | if (atomic_read(&ch->kthreads_assigned) < |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 837 | ch->kthreads_idle_limit) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 838 | /* |
| 839 | * Flag this as an error only if we have an |
| 840 | * insufficient #of kthreads for the channel |
| 841 | * to function. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 842 | */ |
| 843 | spin_lock_irqsave(&ch->lock, irq_flags); |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 844 | XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 845 | &irq_flags); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 846 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 847 | } |
| 848 | break; |
| 849 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 850 | } |
| 851 | } |
| 852 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 853 | void |
| 854 | xpc_disconnect_wait(int ch_number) |
| 855 | { |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 856 | unsigned long irq_flags; |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 857 | short partid; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 858 | struct xpc_partition *part; |
| 859 | struct xpc_channel *ch; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 860 | int wakeup_channel_mgr; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 861 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 862 | /* now wait for all callouts to the caller's function to cease */ |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 863 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 864 | part = &xpc_partitions[partid]; |
| 865 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 866 | if (!xpc_part_ref(part)) |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 867 | continue; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 868 | |
| 869 | ch = &part->channels[ch_number]; |
| 870 | |
| 871 | if (!(ch->flags & XPC_C_WDISCONNECT)) { |
| 872 | xpc_part_deref(part); |
| 873 | continue; |
| 874 | } |
| 875 | |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 876 | wait_for_completion(&ch->wdisconnect_wait); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 877 | |
| 878 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 879 | DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED)); |
| 880 | wakeup_channel_mgr = 0; |
| 881 | |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 882 | if (ch->delayed_chctl_flags) { |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 883 | if (part->act_state != XPC_P_AS_DEACTIVATING) { |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 884 | spin_lock(&part->chctl_lock); |
| 885 | part->chctl.flags[ch->number] |= |
| 886 | ch->delayed_chctl_flags; |
| 887 | spin_unlock(&part->chctl_lock); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 888 | wakeup_channel_mgr = 1; |
| 889 | } |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 890 | ch->delayed_chctl_flags = 0; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 891 | } |
| 892 | |
| 893 | ch->flags &= ~XPC_C_WDISCONNECT; |
| 894 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 895 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 896 | if (wakeup_channel_mgr) |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 897 | xpc_wakeup_channel_mgr(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 898 | |
| 899 | xpc_part_deref(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 900 | } |
| 901 | } |
| 902 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 903 | static int |
| 904 | xpc_setup_partitions(void) |
| 905 | { |
| 906 | short partid; |
| 907 | struct xpc_partition *part; |
| 908 | |
| 909 | xpc_partitions = kzalloc(sizeof(struct xpc_partition) * |
| 910 | xp_max_npartitions, GFP_KERNEL); |
| 911 | if (xpc_partitions == NULL) { |
| 912 | dev_err(xpc_part, "can't get memory for partition structure\n"); |
| 913 | return -ENOMEM; |
| 914 | } |
| 915 | |
| 916 | /* |
| 917 | * The first few fields of each entry of xpc_partitions[] need to |
| 918 | * be initialized now so that calls to xpc_connect() and |
| 919 | * xpc_disconnect() can be made prior to the activation of any remote |
| 920 | * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE |
| 921 | * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING |
| 922 | * PARTITION HAS BEEN ACTIVATED. |
| 923 | */ |
| 924 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
| 925 | part = &xpc_partitions[partid]; |
| 926 | |
| 927 | DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part)); |
| 928 | |
| 929 | part->activate_IRQ_rcvd = 0; |
| 930 | spin_lock_init(&part->act_lock); |
| 931 | part->act_state = XPC_P_AS_INACTIVE; |
| 932 | XPC_SET_REASON(part, 0, 0); |
| 933 | |
| 934 | init_timer(&part->disengage_timer); |
| 935 | part->disengage_timer.function = |
| 936 | xpc_timeout_partition_disengage; |
| 937 | part->disengage_timer.data = (unsigned long)part; |
| 938 | |
| 939 | part->setup_state = XPC_P_SS_UNSET; |
| 940 | init_waitqueue_head(&part->teardown_wq); |
| 941 | atomic_set(&part->references, 0); |
| 942 | } |
| 943 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 944 | return xpc_arch_ops.setup_partitions(); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 945 | } |
| 946 | |
| 947 | static void |
| 948 | xpc_teardown_partitions(void) |
| 949 | { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 950 | xpc_arch_ops.teardown_partitions(); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 951 | kfree(xpc_partitions); |
| 952 | } |
| 953 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 954 | static void |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 955 | xpc_do_exit(enum xp_retval reason) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 956 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 957 | short partid; |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 958 | int active_part_count, printed_waiting_msg = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 959 | struct xpc_partition *part; |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 960 | unsigned long printmsg_time, disengage_timeout = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 961 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 962 | /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */ |
| 963 | DBUG_ON(xpc_exiting == 1); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 964 | |
| 965 | /* |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 966 | * Let the heartbeat checker thread and the discovery thread |
| 967 | * (if one is running) know that they should exit. Also wake up |
| 968 | * the heartbeat checker thread in case it's sleeping. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 969 | */ |
| 970 | xpc_exiting = 1; |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 971 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 972 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 973 | /* wait for the discovery thread to exit */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 974 | wait_for_completion(&xpc_discovery_exited); |
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 heartbeat checker thread to exit */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 977 | wait_for_completion(&xpc_hb_checker_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 978 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 979 | /* sleep for a 1/3 of a second or so */ |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 980 | (void)msleep_interruptible(300); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 981 | |
| 982 | /* wait for all partitions to become inactive */ |
| 983 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 984 | printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
| 985 | xpc_disengage_timedout = 0; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 986 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 987 | do { |
| 988 | active_part_count = 0; |
| 989 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 990 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 991 | part = &xpc_partitions[partid]; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 992 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 993 | if (xpc_partition_disengaged(part) && |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 994 | part->act_state == XPC_P_AS_INACTIVE) { |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 995 | continue; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 996 | } |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 997 | |
| 998 | active_part_count++; |
| 999 | |
| 1000 | XPC_DEACTIVATE_PARTITION(part, reason); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1001 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1002 | if (part->disengage_timeout > disengage_timeout) |
| 1003 | disengage_timeout = part->disengage_timeout; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1004 | } |
| 1005 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1006 | if (xpc_arch_ops.any_partition_engaged()) { |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 1007 | if (time_is_before_jiffies(printmsg_time)) { |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1008 | dev_info(xpc_part, "waiting for remote " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1009 | "partitions to deactivate, timeout in " |
| 1010 | "%ld seconds\n", (disengage_timeout - |
| 1011 | jiffies) / HZ); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1012 | printmsg_time = jiffies + |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1013 | (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1014 | printed_waiting_msg = 1; |
| 1015 | } |
| 1016 | |
| 1017 | } else if (active_part_count > 0) { |
| 1018 | if (printed_waiting_msg) { |
| 1019 | dev_info(xpc_part, "waiting for local partition" |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1020 | " to deactivate\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1021 | printed_waiting_msg = 0; |
| 1022 | } |
| 1023 | |
| 1024 | } else { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1025 | if (!xpc_disengage_timedout) { |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1026 | dev_info(xpc_part, "all partitions have " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1027 | "deactivated\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1028 | } |
| 1029 | break; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1030 | } |
| 1031 | |
| 1032 | /* sleep for a 1/3 of a second or so */ |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1033 | (void)msleep_interruptible(300); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1034 | |
| 1035 | } while (1); |
| 1036 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1037 | DBUG_ON(xpc_arch_ops.any_partition_engaged()); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1038 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1039 | xpc_teardown_rsvd_page(); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1040 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1041 | if (reason == xpUnloading) { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1042 | (void)unregister_die_notifier(&xpc_die_notifier); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1043 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | 0752c67 | 2006-01-10 11:07:19 -0600 | [diff] [blame] | 1044 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1045 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1046 | /* clear the interface to XPC's functions */ |
| 1047 | xpc_clear_interface(); |
| 1048 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1049 | if (xpc_sysctl) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1050 | unregister_sysctl_table(xpc_sysctl); |
Dean Nelson | 7682a4c | 2006-08-08 15:03:29 -0500 | [diff] [blame] | 1051 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1052 | xpc_teardown_partitions(); |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1053 | |
| 1054 | if (is_shub()) |
| 1055 | xpc_exit_sn2(); |
Dean Nelson | b7f7b07 | 2008-10-29 14:01:12 -0700 | [diff] [blame] | 1056 | else if (is_uv()) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1057 | xpc_exit_uv(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1058 | } |
| 1059 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1060 | /* |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1061 | * This function is called when the system is being rebooted. |
| 1062 | */ |
| 1063 | static int |
| 1064 | xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused) |
| 1065 | { |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1066 | enum xp_retval reason; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1067 | |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1068 | switch (event) { |
| 1069 | case SYS_RESTART: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1070 | reason = xpSystemReboot; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1071 | break; |
| 1072 | case SYS_HALT: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1073 | reason = xpSystemHalt; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1074 | break; |
| 1075 | case SYS_POWER_OFF: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1076 | reason = xpSystemPoweroff; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1077 | break; |
| 1078 | default: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1079 | reason = xpSystemGoingDown; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | xpc_do_exit(reason); |
| 1083 | return NOTIFY_DONE; |
| 1084 | } |
| 1085 | |
Robin Holt | 891348c | 2012-12-20 15:05:50 -0800 | [diff] [blame] | 1086 | /* Used to only allow one cpu to complete disconnect */ |
| 1087 | static unsigned int xpc_die_disconnecting; |
| 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 | |
Robin Holt | 891348c | 2012-12-20 15:05:50 -0800 | [diff] [blame] | 1102 | if (cmpxchg(&xpc_die_disconnecting, 0, 1)) |
| 1103 | return; |
| 1104 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1105 | /* keep xpc_hb_checker thread from doing anything (just in case) */ |
| 1106 | xpc_exiting = 1; |
| 1107 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1108 | xpc_arch_ops.disallow_all_hbs(); /*indicate we're deactivated */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1109 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1110 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1111 | part = &xpc_partitions[partid]; |
| 1112 | |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1113 | if (xpc_arch_ops.partition_engaged(partid) || |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1114 | part->act_state != XPC_P_AS_INACTIVE) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1115 | xpc_arch_ops.request_partition_deactivation(part); |
| 1116 | xpc_arch_ops.indicate_partition_disengaged(part); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1117 | } |
| 1118 | } |
| 1119 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1120 | /* |
| 1121 | * Though we requested that all other partitions deactivate from us, |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1122 | * we only wait until they've all disengaged or we've reached the |
| 1123 | * defined timelimit. |
| 1124 | * |
| 1125 | * Given that one iteration through the following while-loop takes |
| 1126 | * approximately 200 microseconds, calculate the #of loops to take |
| 1127 | * before bailing and the #of loops before printing a waiting message. |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1128 | */ |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1129 | keep_waiting = xpc_disengage_timelimit * 1000 * 5; |
| 1130 | wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5; |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1131 | |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1132 | while (1) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1133 | any_engaged = xpc_arch_ops.any_partition_engaged(); |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1134 | if (!any_engaged) { |
| 1135 | dev_info(xpc_part, "all partitions have deactivated\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1136 | break; |
| 1137 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1138 | |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1139 | if (!keep_waiting--) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1140 | for (partid = 0; partid < xp_max_npartitions; |
| 1141 | partid++) { |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1142 | if (xpc_arch_ops.partition_engaged(partid)) { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1143 | dev_info(xpc_part, "deactivate from " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1144 | "remote partition %d timed " |
| 1145 | "out\n", partid); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1146 | } |
| 1147 | } |
| 1148 | break; |
| 1149 | } |
| 1150 | |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1151 | if (!wait_to_print--) { |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1152 | dev_info(xpc_part, "waiting for remote partitions to " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1153 | "deactivate, timeout in %ld seconds\n", |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1154 | keep_waiting / (1000 * 5)); |
| 1155 | wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * |
| 1156 | 1000 * 5; |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1157 | } |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1158 | |
| 1159 | udelay(200); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1160 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1161 | } |
| 1162 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1163 | /* |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1164 | * This function is called when the system is being restarted or halted due |
| 1165 | * to some sort of system failure. If this is the case we need to notify the |
| 1166 | * other partitions to disengage from all references to our memory. |
| 1167 | * This function can also be called when our heartbeater could be offlined |
| 1168 | * for a time. In this case we need to notify other partitions to not worry |
| 1169 | * about the lack of a heartbeat. |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1170 | */ |
| 1171 | static int |
Robin Holt | 891348c | 2012-12-20 15:05:50 -0800 | [diff] [blame] | 1172 | xpc_system_die(struct notifier_block *nb, unsigned long event, void *_die_args) |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1173 | { |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1174 | #ifdef CONFIG_IA64 /* !!! temporary kludge */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1175 | switch (event) { |
| 1176 | case DIE_MACHINE_RESTART: |
| 1177 | case DIE_MACHINE_HALT: |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1178 | xpc_die_deactivate(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1179 | break; |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1180 | |
| 1181 | case DIE_KDEBUG_ENTER: |
| 1182 | /* Should lack of heartbeat be ignored by other partitions? */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1183 | if (!xpc_kdebug_ignore) |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1184 | break; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1185 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1186 | /* fall through */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1187 | case DIE_MCA_MONARCH_ENTER: |
| 1188 | case DIE_INIT_MONARCH_ENTER: |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1189 | xpc_arch_ops.offline_heartbeat(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1190 | break; |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1191 | |
| 1192 | case DIE_KDEBUG_LEAVE: |
| 1193 | /* Is lack of heartbeat being ignored by other partitions? */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1194 | if (!xpc_kdebug_ignore) |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1195 | break; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1196 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1197 | /* fall through */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1198 | case DIE_MCA_MONARCH_LEAVE: |
| 1199 | case DIE_INIT_MONARCH_LEAVE: |
Robin Holt | a7665b0 | 2009-04-13 14:40:19 -0700 | [diff] [blame] | 1200 | xpc_arch_ops.online_heartbeat(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1201 | break; |
| 1202 | } |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1203 | #else |
Robin Holt | 891348c | 2012-12-20 15:05:50 -0800 | [diff] [blame] | 1204 | struct die_args *die_args = _die_args; |
| 1205 | |
| 1206 | switch (event) { |
| 1207 | case DIE_TRAP: |
| 1208 | if (die_args->trapnr == X86_TRAP_DF) |
| 1209 | xpc_die_deactivate(); |
| 1210 | |
| 1211 | if (((die_args->trapnr == X86_TRAP_MF) || |
| 1212 | (die_args->trapnr == X86_TRAP_XF)) && |
| 1213 | !user_mode_vm(die_args->regs)) |
| 1214 | xpc_die_deactivate(); |
| 1215 | |
| 1216 | break; |
| 1217 | case DIE_INT3: |
| 1218 | case DIE_DEBUG: |
| 1219 | break; |
| 1220 | case DIE_OOPS: |
| 1221 | case DIE_GPF: |
| 1222 | default: |
| 1223 | xpc_die_deactivate(); |
| 1224 | } |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1225 | #endif |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1226 | |
| 1227 | return NOTIFY_DONE; |
| 1228 | } |
| 1229 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1230 | int __init |
| 1231 | xpc_init(void) |
| 1232 | { |
| 1233 | int ret; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1234 | struct task_struct *kthread; |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1235 | |
Kay Sievers | bb0dc43 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 1236 | dev_set_name(xpc_part, "part"); |
| 1237 | dev_set_name(xpc_chan, "chan"); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1238 | |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1239 | if (is_shub()) { |
| 1240 | /* |
| 1241 | * The ia64-sn2 architecture supports at most 64 partitions. |
Dean Nelson | c39838c | 2008-07-29 22:34:11 -0700 | [diff] [blame] | 1242 | * And the inability to unregister remote amos restricts us |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1243 | * further to only support exactly 64 partitions on this |
| 1244 | * architecture, no less. |
| 1245 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1246 | if (xp_max_npartitions != 64) { |
| 1247 | dev_err(xpc_part, "max #of partitions not set to 64\n"); |
| 1248 | ret = -EINVAL; |
| 1249 | } else { |
| 1250 | ret = xpc_init_sn2(); |
| 1251 | } |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1252 | |
| 1253 | } else if (is_uv()) { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1254 | ret = xpc_init_uv(); |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1255 | |
| 1256 | } else { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1257 | ret = -ENODEV; |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1258 | } |
Dean Nelson | 408865c | 2005-09-08 10:46:58 -0500 | [diff] [blame] | 1259 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1260 | if (ret != 0) |
| 1261 | return ret; |
| 1262 | |
| 1263 | ret = xpc_setup_partitions(); |
| 1264 | if (ret != 0) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1265 | dev_err(xpc_part, "can't get memory for partition structure\n"); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1266 | goto out_1; |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1267 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1268 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1269 | xpc_sysctl = register_sysctl_table(xpc_sys_dir); |
| 1270 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1271 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1272 | * Fill the partition reserved page with the information needed by |
| 1273 | * other partitions to discover we are alive and establish initial |
| 1274 | * communications. |
| 1275 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1276 | ret = xpc_setup_rsvd_page(); |
| 1277 | if (ret != 0) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1278 | dev_err(xpc_part, "can't setup our reserved page\n"); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1279 | goto out_2; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1280 | } |
| 1281 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1282 | /* add ourselves to the reboot_notifier_list */ |
| 1283 | ret = register_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1284 | if (ret != 0) |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1285 | dev_warn(xpc_part, "can't register reboot notifier\n"); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1286 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 1287 | /* add ourselves to the die_notifier list */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1288 | ret = register_die_notifier(&xpc_die_notifier); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1289 | if (ret != 0) |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1290 | dev_warn(xpc_part, "can't register die notifier\n"); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1291 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1292 | /* |
| 1293 | * The real work-horse behind xpc. This processes incoming |
| 1294 | * interrupts and monitors remote heartbeats. |
| 1295 | */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1296 | kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME); |
| 1297 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1298 | dev_err(xpc_part, "failed while forking hb check thread\n"); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1299 | ret = -EBUSY; |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1300 | goto out_3; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1301 | } |
| 1302 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1303 | /* |
| 1304 | * Startup a thread that will attempt to discover other partitions to |
| 1305 | * activate based on info provided by SAL. This new thread is short |
| 1306 | * lived and will exit once discovery is complete. |
| 1307 | */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1308 | kthread = kthread_run(xpc_initiate_discovery, NULL, |
| 1309 | XPC_DISCOVERY_THREAD_NAME); |
| 1310 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1311 | dev_err(xpc_part, "failed while forking discovery thread\n"); |
| 1312 | |
| 1313 | /* mark this new thread as a non-starter */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 1314 | complete(&xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1315 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1316 | xpc_do_exit(xpUnloading); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1317 | return -EBUSY; |
| 1318 | } |
| 1319 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1320 | /* set the interface to point at XPC's functions */ |
| 1321 | xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect, |
Dean Nelson | 97bf1aa | 2008-07-29 22:34:08 -0700 | [diff] [blame] | 1322 | xpc_initiate_send, xpc_initiate_send_notify, |
| 1323 | xpc_initiate_received, xpc_initiate_partid_to_nasids); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1324 | |
| 1325 | return 0; |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1326 | |
| 1327 | /* initialization was not successful */ |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1328 | out_3: |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1329 | xpc_teardown_rsvd_page(); |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1330 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1331 | (void)unregister_die_notifier(&xpc_die_notifier); |
| 1332 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1333 | out_2: |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1334 | if (xpc_sysctl) |
| 1335 | unregister_sysctl_table(xpc_sysctl); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1336 | |
| 1337 | xpc_teardown_partitions(); |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1338 | out_1: |
| 1339 | if (is_shub()) |
| 1340 | xpc_exit_sn2(); |
Dean Nelson | b7f7b07 | 2008-10-29 14:01:12 -0700 | [diff] [blame] | 1341 | else if (is_uv()) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1342 | xpc_exit_uv(); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1343 | return ret; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1344 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1345 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1346 | module_init(xpc_init); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1347 | |
| 1348 | void __exit |
| 1349 | xpc_exit(void) |
| 1350 | { |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1351 | xpc_do_exit(xpUnloading); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1352 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1353 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1354 | module_exit(xpc_exit); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1355 | |
| 1356 | MODULE_AUTHOR("Silicon Graphics, Inc."); |
| 1357 | MODULE_DESCRIPTION("Cross Partition Communication (XPC) support"); |
| 1358 | MODULE_LICENSE("GPL"); |
| 1359 | |
| 1360 | module_param(xpc_hb_interval, int, 0); |
| 1361 | MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1362 | "heartbeat increments."); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1363 | |
| 1364 | module_param(xpc_hb_check_interval, int, 0); |
| 1365 | MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1366 | "heartbeat checks."); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1367 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1368 | module_param(xpc_disengage_timelimit, int, 0); |
| 1369 | MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait " |
| 1370 | "for disengage to complete."); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 1371 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1372 | module_param(xpc_kdebug_ignore, int, 0); |
| 1373 | 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] | 1374 | "other partitions when dropping into kdebug."); |