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 | * |
Dean Nelson | 45d9ca4 | 2008-04-22 14:46:56 -0500 | [diff] [blame] | 6 | * Copyright (c) 2004-2008 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; |
| 153 | void *xpc_heartbeating_to_mask; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 154 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 155 | /* notification that the xpc_hb_checker thread has exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 156 | static DECLARE_COMPLETION(xpc_hb_checker_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 157 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 158 | /* notification that the xpc_discovery thread has exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 159 | static DECLARE_COMPLETION(xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 160 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 161 | static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *); |
| 162 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 163 | static int xpc_system_reboot(struct notifier_block *, unsigned long, void *); |
| 164 | static struct notifier_block xpc_reboot_notifier = { |
| 165 | .notifier_call = xpc_system_reboot, |
| 166 | }; |
| 167 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 168 | static int xpc_system_die(struct notifier_block *, unsigned long, void *); |
| 169 | static struct notifier_block xpc_die_notifier = { |
| 170 | .notifier_call = xpc_system_die, |
| 171 | }; |
| 172 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 173 | int (*xpc_setup_partitions_sn) (void); |
Dean Nelson | a812dcc | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 174 | enum xp_retval (*xpc_get_partition_rsvd_page_pa) (void *buf, u64 *cookie, |
| 175 | unsigned long *rp_pa, |
| 176 | size_t *len); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 177 | int (*xpc_setup_rsvd_page_sn) (struct xpc_rsvd_page *rp); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 178 | void (*xpc_heartbeat_init) (void); |
| 179 | void (*xpc_heartbeat_exit) (void); |
| 180 | void (*xpc_increment_heartbeat) (void); |
| 181 | void (*xpc_offline_heartbeat) (void); |
| 182 | void (*xpc_online_heartbeat) (void); |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 183 | enum xp_retval (*xpc_get_remote_heartbeat) (struct xpc_partition *part); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 184 | |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 185 | enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part); |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 186 | void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *ch); |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 187 | u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *part); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 188 | enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *ch); |
| 189 | void (*xpc_teardown_msg_structures) (struct xpc_channel *ch); |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 190 | void (*xpc_process_msg_chctl_flags) (struct xpc_partition *part, int ch_number); |
Dean Nelson | bd3e64c | 2008-07-29 22:34:19 -0700 | [diff] [blame] | 191 | int (*xpc_n_of_deliverable_payloads) (struct xpc_channel *ch); |
| 192 | void *(*xpc_get_deliverable_payload) (struct xpc_channel *ch); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 193 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 194 | void (*xpc_request_partition_activation) (struct xpc_rsvd_page *remote_rp, |
Dean Nelson | a812dcc | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 195 | unsigned long remote_rp_pa, |
| 196 | int nasid); |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 197 | void (*xpc_request_partition_reactivation) (struct xpc_partition *part); |
| 198 | void (*xpc_request_partition_deactivation) (struct xpc_partition *part); |
| 199 | void (*xpc_cancel_partition_deactivation_request) (struct xpc_partition *part); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 200 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 201 | void (*xpc_process_activate_IRQ_rcvd) (void); |
| 202 | enum xp_retval (*xpc_setup_ch_structures_sn) (struct xpc_partition *part); |
| 203 | void (*xpc_teardown_ch_structures_sn) (struct xpc_partition *part); |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 204 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 205 | void (*xpc_indicate_partition_engaged) (struct xpc_partition *part); |
| 206 | int (*xpc_partition_engaged) (short partid); |
| 207 | int (*xpc_any_partition_engaged) (void); |
| 208 | void (*xpc_indicate_partition_disengaged) (struct xpc_partition *part); |
| 209 | void (*xpc_assume_partition_disengaged) (short partid); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 210 | |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 211 | void (*xpc_send_chctl_closerequest) (struct xpc_channel *ch, |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 212 | unsigned long *irq_flags); |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 213 | void (*xpc_send_chctl_closereply) (struct xpc_channel *ch, |
| 214 | unsigned long *irq_flags); |
| 215 | void (*xpc_send_chctl_openrequest) (struct xpc_channel *ch, |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 216 | unsigned long *irq_flags); |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 217 | void (*xpc_send_chctl_openreply) (struct xpc_channel *ch, |
| 218 | unsigned long *irq_flags); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 219 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 220 | void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *ch, |
| 221 | unsigned long msgqueue_pa); |
| 222 | |
Dean Nelson | bd3e64c | 2008-07-29 22:34:19 -0700 | [diff] [blame] | 223 | enum xp_retval (*xpc_send_payload) (struct xpc_channel *ch, u32 flags, |
| 224 | void *payload, u16 payload_size, |
| 225 | u8 notify_type, xpc_notify_func func, |
| 226 | void *key); |
| 227 | void (*xpc_received_payload) (struct xpc_channel *ch, void *payload); |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 228 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 229 | /* |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 230 | * Timer function to enforce the timelimit on the partition disengage. |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 231 | */ |
| 232 | static void |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 233 | xpc_timeout_partition_disengage(unsigned long data) |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 234 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 235 | struct xpc_partition *part = (struct xpc_partition *)data; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 236 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 237 | DBUG_ON(time_is_after_jiffies(part->disengage_timeout)); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 238 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 239 | (void)xpc_partition_disengaged(part); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 240 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 241 | DBUG_ON(part->disengage_timeout != 0); |
| 242 | DBUG_ON(xpc_partition_engaged(XPC_PARTID(part))); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 243 | } |
| 244 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 245 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 246 | * Timer to produce the heartbeat. The timer structures function is |
| 247 | * already set when this is initially called. A tunable is used to |
| 248 | * specify when the next timeout should occur. |
| 249 | */ |
| 250 | static void |
| 251 | xpc_hb_beater(unsigned long dummy) |
| 252 | { |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 253 | xpc_increment_heartbeat(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 254 | |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 255 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 256 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 257 | |
| 258 | xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ); |
| 259 | add_timer(&xpc_hb_timer); |
| 260 | } |
| 261 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 262 | static void |
| 263 | xpc_start_hb_beater(void) |
| 264 | { |
| 265 | xpc_heartbeat_init(); |
| 266 | init_timer(&xpc_hb_timer); |
| 267 | xpc_hb_timer.function = xpc_hb_beater; |
| 268 | xpc_hb_beater(0); |
| 269 | } |
| 270 | |
| 271 | static void |
| 272 | xpc_stop_hb_beater(void) |
| 273 | { |
| 274 | del_timer_sync(&xpc_hb_timer); |
| 275 | xpc_heartbeat_exit(); |
| 276 | } |
| 277 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 278 | /* |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 279 | * At periodic intervals, scan through all active partitions and ensure |
| 280 | * their heartbeat is still active. If not, the partition is deactivated. |
| 281 | */ |
| 282 | static void |
| 283 | xpc_check_remote_hb(void) |
| 284 | { |
| 285 | struct xpc_partition *part; |
| 286 | short partid; |
| 287 | enum xp_retval ret; |
| 288 | |
| 289 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
| 290 | |
| 291 | if (xpc_exiting) |
| 292 | break; |
| 293 | |
| 294 | if (partid == xp_partition_id) |
| 295 | continue; |
| 296 | |
| 297 | part = &xpc_partitions[partid]; |
| 298 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 299 | if (part->act_state == XPC_P_AS_INACTIVE || |
| 300 | part->act_state == XPC_P_AS_DEACTIVATING) { |
Dean Nelson | 61deb86 | 2008-07-29 22:34:17 -0700 | [diff] [blame] | 301 | continue; |
| 302 | } |
| 303 | |
| 304 | ret = xpc_get_remote_heartbeat(part); |
| 305 | if (ret != xpSuccess) |
| 306 | XPC_DEACTIVATE_PARTITION(part, ret); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 311 | * This thread is responsible for nearly all of the partition |
| 312 | * activation/deactivation. |
| 313 | */ |
| 314 | static int |
| 315 | xpc_hb_checker(void *ignore) |
| 316 | { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 317 | int force_IRQ = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 318 | |
| 319 | /* this thread was marked active by xpc_hb_init() */ |
| 320 | |
Rusty Russell | f7df8ed | 2009-01-10 21:58:09 -0800 | [diff] [blame] | 321 | set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 322 | |
Dean Nelson | 4c013f5 | 2007-11-07 07:53:06 -0600 | [diff] [blame] | 323 | /* set our heartbeating to other partitions into motion */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 324 | xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 325 | xpc_start_hb_beater(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 326 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 327 | while (!xpc_exiting) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 328 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 329 | dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have " |
| 330 | "been received\n", |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 331 | (int)(xpc_hb_check_timeout - jiffies), |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 332 | xpc_activate_IRQ_rcvd); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 333 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 334 | /* checking of remote heartbeats is skewed by IRQ handling */ |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 335 | if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 336 | xpc_hb_check_timeout = jiffies + |
| 337 | (xpc_hb_check_interval * HZ); |
| 338 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 339 | dev_dbg(xpc_part, "checking remote heartbeats\n"); |
| 340 | xpc_check_remote_hb(); |
| 341 | |
| 342 | /* |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 343 | * On sn2 we need to periodically recheck to ensure no |
| 344 | * IRQ/amo pairs have been missed. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 345 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 346 | if (is_shub()) |
| 347 | force_IRQ = 1; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 348 | } |
| 349 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 350 | /* check for outstanding IRQs */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 351 | if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 352 | force_IRQ = 0; |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 353 | dev_dbg(xpc_part, "processing activate IRQs " |
| 354 | "received\n"); |
| 355 | xpc_process_activate_IRQ_rcvd(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 356 | } |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 357 | |
| 358 | /* wait for IRQ or timeout */ |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 359 | (void)wait_event_interruptible(xpc_activate_IRQ_wq, |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 360 | (time_is_before_eq_jiffies( |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 361 | xpc_hb_check_timeout) || |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 362 | xpc_activate_IRQ_rcvd > 0 || |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 363 | xpc_exiting)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 364 | } |
| 365 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 366 | xpc_stop_hb_beater(); |
| 367 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 368 | dev_dbg(xpc_part, "heartbeat checker is exiting\n"); |
| 369 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 370 | /* mark this thread as having exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 371 | complete(&xpc_hb_checker_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 372 | return 0; |
| 373 | } |
| 374 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 375 | /* |
| 376 | * This thread will attempt to discover other partitions to activate |
| 377 | * based on info provided by SAL. This new thread is short lived and |
| 378 | * will exit once discovery is complete. |
| 379 | */ |
| 380 | static int |
| 381 | xpc_initiate_discovery(void *ignore) |
| 382 | { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 383 | xpc_discovery(); |
| 384 | |
| 385 | dev_dbg(xpc_part, "discovery thread is exiting\n"); |
| 386 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 387 | /* mark this thread as having exited */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 388 | complete(&xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 389 | return 0; |
| 390 | } |
| 391 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 392 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 393 | * The first kthread assigned to a newly activated partition is the one |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 394 | * 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] | 395 | * that kthread until the partition is brought down, at which time that kthread |
| 396 | * returns back to XPC HB. (The return of that kthread will signify to XPC HB |
| 397 | * that XPC has dismantled all communication infrastructure for the associated |
| 398 | * partition.) This kthread becomes the channel manager for that partition. |
| 399 | * |
| 400 | * Each active partition has a channel manager, who, besides connecting and |
| 401 | * disconnecting channels, will ensure that each of the partition's connected |
| 402 | * channels has the required number of assigned kthreads to get the work done. |
| 403 | */ |
| 404 | static void |
| 405 | xpc_channel_mgr(struct xpc_partition *part) |
| 406 | { |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 407 | while (part->act_state != XPC_P_AS_DEACTIVATING || |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 408 | atomic_read(&part->nchannels_active) > 0 || |
| 409 | !xpc_partition_disengaged(part)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 410 | |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 411 | xpc_process_sent_chctl_flags(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 412 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 413 | /* |
| 414 | * Wait until we've been requested to activate kthreads or |
| 415 | * all of the channel's message queues have been torn down or |
| 416 | * a signal is pending. |
| 417 | * |
| 418 | * The channel_mgr_requests is set to 1 after being awakened, |
| 419 | * This is done to prevent the channel mgr from making one pass |
| 420 | * through the loop for each request, since he will |
| 421 | * be servicing all the requests in one pass. The reason it's |
| 422 | * set to 1 instead of 0 is so that other kthreads will know |
| 423 | * that the channel mgr is running and won't bother trying to |
| 424 | * wake him up. |
| 425 | */ |
| 426 | atomic_dec(&part->channel_mgr_requests); |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 427 | (void)wait_event_interruptible(part->channel_mgr_wq, |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 428 | (atomic_read(&part->channel_mgr_requests) > 0 || |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 429 | part->chctl.all_flags != 0 || |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 430 | (part->act_state == XPC_P_AS_DEACTIVATING && |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 431 | atomic_read(&part->nchannels_active) == 0 && |
| 432 | xpc_partition_disengaged(part)))); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 433 | atomic_set(&part->channel_mgr_requests, 1); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 434 | } |
| 435 | } |
| 436 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 437 | /* |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 438 | * Guarantee that the kzalloc'd memory is cacheline aligned. |
| 439 | */ |
| 440 | void * |
| 441 | xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base) |
| 442 | { |
| 443 | /* see if kzalloc will give us cachline aligned memory by default */ |
| 444 | *base = kzalloc(size, flags); |
| 445 | if (*base == NULL) |
| 446 | return NULL; |
| 447 | |
| 448 | if ((u64)*base == L1_CACHE_ALIGN((u64)*base)) |
| 449 | return *base; |
| 450 | |
| 451 | kfree(*base); |
| 452 | |
| 453 | /* nope, we'll have to do it ourselves */ |
| 454 | *base = kzalloc(size + L1_CACHE_BYTES, flags); |
| 455 | if (*base == NULL) |
| 456 | return NULL; |
| 457 | |
| 458 | return (void *)L1_CACHE_ALIGN((u64)*base); |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * Setup the channel structures necessary to support XPartition Communication |
| 463 | * between the specified remote partition and the local one. |
| 464 | */ |
| 465 | static enum xp_retval |
| 466 | xpc_setup_ch_structures(struct xpc_partition *part) |
| 467 | { |
| 468 | enum xp_retval ret; |
| 469 | int ch_number; |
| 470 | struct xpc_channel *ch; |
| 471 | short partid = XPC_PARTID(part); |
| 472 | |
| 473 | /* |
| 474 | * Allocate all of the channel structures as a contiguous chunk of |
| 475 | * memory. |
| 476 | */ |
| 477 | DBUG_ON(part->channels != NULL); |
| 478 | part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS, |
| 479 | GFP_KERNEL); |
| 480 | if (part->channels == NULL) { |
| 481 | dev_err(xpc_chan, "can't get memory for channels\n"); |
| 482 | return xpNoMemory; |
| 483 | } |
| 484 | |
| 485 | /* allocate the remote open and close args */ |
| 486 | |
| 487 | part->remote_openclose_args = |
| 488 | xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, |
| 489 | GFP_KERNEL, &part-> |
| 490 | remote_openclose_args_base); |
| 491 | if (part->remote_openclose_args == NULL) { |
| 492 | dev_err(xpc_chan, "can't get memory for remote connect args\n"); |
| 493 | ret = xpNoMemory; |
| 494 | goto out_1; |
| 495 | } |
| 496 | |
| 497 | part->chctl.all_flags = 0; |
| 498 | spin_lock_init(&part->chctl_lock); |
| 499 | |
| 500 | atomic_set(&part->channel_mgr_requests, 1); |
| 501 | init_waitqueue_head(&part->channel_mgr_wq); |
| 502 | |
| 503 | part->nchannels = XPC_MAX_NCHANNELS; |
| 504 | |
| 505 | atomic_set(&part->nchannels_active, 0); |
| 506 | atomic_set(&part->nchannels_engaged, 0); |
| 507 | |
| 508 | for (ch_number = 0; ch_number < part->nchannels; ch_number++) { |
| 509 | ch = &part->channels[ch_number]; |
| 510 | |
| 511 | ch->partid = partid; |
| 512 | ch->number = ch_number; |
| 513 | ch->flags = XPC_C_DISCONNECTED; |
| 514 | |
| 515 | atomic_set(&ch->kthreads_assigned, 0); |
| 516 | atomic_set(&ch->kthreads_idle, 0); |
| 517 | atomic_set(&ch->kthreads_active, 0); |
| 518 | |
| 519 | atomic_set(&ch->references, 0); |
| 520 | atomic_set(&ch->n_to_notify, 0); |
| 521 | |
| 522 | spin_lock_init(&ch->lock); |
| 523 | init_completion(&ch->wdisconnect_wait); |
| 524 | |
| 525 | atomic_set(&ch->n_on_msg_allocate_wq, 0); |
| 526 | init_waitqueue_head(&ch->msg_allocate_wq); |
| 527 | init_waitqueue_head(&ch->idle_wq); |
| 528 | } |
| 529 | |
| 530 | ret = xpc_setup_ch_structures_sn(part); |
| 531 | if (ret != xpSuccess) |
| 532 | goto out_2; |
| 533 | |
| 534 | /* |
| 535 | * With the setting of the partition setup_state to XPC_P_SS_SETUP, |
| 536 | * we're declaring that this partition is ready to go. |
| 537 | */ |
| 538 | part->setup_state = XPC_P_SS_SETUP; |
| 539 | |
| 540 | return xpSuccess; |
| 541 | |
| 542 | /* setup of ch structures failed */ |
| 543 | out_2: |
| 544 | kfree(part->remote_openclose_args_base); |
| 545 | part->remote_openclose_args = NULL; |
| 546 | out_1: |
| 547 | kfree(part->channels); |
| 548 | part->channels = NULL; |
| 549 | return ret; |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * Teardown the channel structures necessary to support XPartition Communication |
| 554 | * between the specified remote partition and the local one. |
| 555 | */ |
| 556 | static void |
| 557 | xpc_teardown_ch_structures(struct xpc_partition *part) |
| 558 | { |
| 559 | DBUG_ON(atomic_read(&part->nchannels_engaged) != 0); |
| 560 | DBUG_ON(atomic_read(&part->nchannels_active) != 0); |
| 561 | |
| 562 | /* |
| 563 | * Make this partition inaccessible to local processes by marking it |
| 564 | * as no longer setup. Then wait before proceeding with the teardown |
| 565 | * until all existing references cease. |
| 566 | */ |
| 567 | DBUG_ON(part->setup_state != XPC_P_SS_SETUP); |
| 568 | part->setup_state = XPC_P_SS_WTEARDOWN; |
| 569 | |
| 570 | wait_event(part->teardown_wq, (atomic_read(&part->references) == 0)); |
| 571 | |
| 572 | /* now we can begin tearing down the infrastructure */ |
| 573 | |
| 574 | xpc_teardown_ch_structures_sn(part); |
| 575 | |
| 576 | kfree(part->remote_openclose_args_base); |
| 577 | part->remote_openclose_args = NULL; |
| 578 | kfree(part->channels); |
| 579 | part->channels = NULL; |
| 580 | |
| 581 | part->setup_state = XPC_P_SS_TORNDOWN; |
| 582 | } |
| 583 | |
| 584 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 585 | * When XPC HB determines that a partition has come up, it will create a new |
| 586 | * kthread and that kthread will call this function to attempt to set up the |
| 587 | * basic infrastructure used for Cross Partition Communication with the newly |
| 588 | * upped partition. |
| 589 | * |
| 590 | * The kthread that was created by XPC HB and which setup the XPC |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 591 | * infrastructure will remain assigned to the partition becoming the channel |
| 592 | * manager for that partition until the partition is deactivating, at which |
| 593 | * time the kthread will teardown the XPC infrastructure and then exit. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 594 | */ |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 595 | static int |
| 596 | xpc_activating(void *__partid) |
| 597 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 598 | short partid = (u64)__partid; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 599 | struct xpc_partition *part = &xpc_partitions[partid]; |
| 600 | unsigned long irq_flags; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 601 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 602 | DBUG_ON(partid < 0 || partid >= xp_max_npartitions); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 603 | |
| 604 | spin_lock_irqsave(&part->act_lock, irq_flags); |
| 605 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 606 | if (part->act_state == XPC_P_AS_DEACTIVATING) { |
| 607 | part->act_state = XPC_P_AS_INACTIVE; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 608 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 609 | part->remote_rp_pa = 0; |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | /* indicate the thread is activating */ |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 614 | DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ); |
| 615 | part->act_state = XPC_P_AS_ACTIVATING; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 616 | |
| 617 | XPC_SET_REASON(part, 0, 0); |
| 618 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 619 | |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 620 | dev_dbg(xpc_part, "activating partition %d\n", partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 621 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 622 | xpc_allow_hb(partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 623 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 624 | if (xpc_setup_ch_structures(part) == xpSuccess) { |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 625 | (void)xpc_part_ref(part); /* this will always succeed */ |
| 626 | |
| 627 | if (xpc_make_first_contact(part) == xpSuccess) { |
| 628 | xpc_mark_partition_active(part); |
| 629 | xpc_channel_mgr(part); |
| 630 | /* won't return until partition is deactivating */ |
| 631 | } |
| 632 | |
| 633 | xpc_part_deref(part); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 634 | xpc_teardown_ch_structures(part); |
Dean Nelson | e17d416 | 2008-07-29 22:34:06 -0700 | [diff] [blame] | 635 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 636 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 637 | xpc_disallow_hb(partid); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 638 | xpc_mark_partition_inactive(part); |
| 639 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 640 | if (part->reason == xpReactivating) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 641 | /* interrupting ourselves results in activating partition */ |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 642 | xpc_request_partition_reactivation(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 643 | } |
| 644 | |
| 645 | return 0; |
| 646 | } |
| 647 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 648 | void |
| 649 | xpc_activate_partition(struct xpc_partition *part) |
| 650 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 651 | short partid = XPC_PARTID(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 652 | unsigned long irq_flags; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 653 | struct task_struct *kthread; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 654 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 655 | spin_lock_irqsave(&part->act_lock, irq_flags); |
| 656 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 657 | DBUG_ON(part->act_state != XPC_P_AS_INACTIVE); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 658 | |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 659 | part->act_state = XPC_P_AS_ACTIVATION_REQ; |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 660 | XPC_SET_REASON(part, xpCloneKThread, __LINE__); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 661 | |
| 662 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 663 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 664 | kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d", |
| 665 | partid); |
| 666 | if (IS_ERR(kthread)) { |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 667 | spin_lock_irqsave(&part->act_lock, irq_flags); |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 668 | part->act_state = XPC_P_AS_INACTIVE; |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 669 | XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__); |
Robin Holt | 7c6c663 | 2006-02-02 12:30:21 -0600 | [diff] [blame] | 670 | spin_unlock_irqrestore(&part->act_lock, irq_flags); |
| 671 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 672 | } |
| 673 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 674 | void |
| 675 | xpc_activate_kthreads(struct xpc_channel *ch, int needed) |
| 676 | { |
| 677 | int idle = atomic_read(&ch->kthreads_idle); |
| 678 | int assigned = atomic_read(&ch->kthreads_assigned); |
| 679 | int wakeup; |
| 680 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 681 | DBUG_ON(needed <= 0); |
| 682 | |
| 683 | if (idle > 0) { |
| 684 | wakeup = (needed > idle) ? idle : needed; |
| 685 | needed -= wakeup; |
| 686 | |
| 687 | dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, " |
| 688 | "channel=%d\n", wakeup, ch->partid, ch->number); |
| 689 | |
| 690 | /* only wakeup the requested number of kthreads */ |
| 691 | wake_up_nr(&ch->idle_wq, wakeup); |
| 692 | } |
| 693 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 694 | if (needed <= 0) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 695 | return; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 696 | |
| 697 | if (needed + assigned > ch->kthreads_assigned_limit) { |
| 698 | needed = ch->kthreads_assigned_limit - assigned; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 699 | if (needed <= 0) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 700 | return; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n", |
| 704 | needed, ch->partid, ch->number); |
| 705 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 706 | xpc_create_kthreads(ch, needed, 0); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 707 | } |
| 708 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 709 | /* |
| 710 | * This function is where XPC's kthreads wait for messages to deliver. |
| 711 | */ |
| 712 | static void |
| 713 | xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch) |
| 714 | { |
| 715 | do { |
| 716 | /* deliver messages to their intended recipients */ |
| 717 | |
Dean Nelson | bd3e64c | 2008-07-29 22:34:19 -0700 | [diff] [blame] | 718 | while (xpc_n_of_deliverable_payloads(ch) > 0 && |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 719 | !(ch->flags & XPC_C_DISCONNECTING)) { |
Dean Nelson | bd3e64c | 2008-07-29 22:34:19 -0700 | [diff] [blame] | 720 | xpc_deliver_payload(ch); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 721 | } |
| 722 | |
| 723 | if (atomic_inc_return(&ch->kthreads_idle) > |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 724 | ch->kthreads_idle_limit) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 725 | /* too many idle kthreads on this channel */ |
| 726 | atomic_dec(&ch->kthreads_idle); |
| 727 | break; |
| 728 | } |
| 729 | |
| 730 | dev_dbg(xpc_chan, "idle kthread calling " |
| 731 | "wait_event_interruptible_exclusive()\n"); |
| 732 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 733 | (void)wait_event_interruptible_exclusive(ch->idle_wq, |
Dean Nelson | bd3e64c | 2008-07-29 22:34:19 -0700 | [diff] [blame] | 734 | (xpc_n_of_deliverable_payloads(ch) > 0 || |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 735 | (ch->flags & XPC_C_DISCONNECTING))); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 736 | |
| 737 | atomic_dec(&ch->kthreads_idle); |
| 738 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 739 | } while (!(ch->flags & XPC_C_DISCONNECTING)); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 740 | } |
| 741 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 742 | static int |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 743 | xpc_kthread_start(void *args) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 744 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 745 | short partid = XPC_UNPACK_ARG1(args); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 746 | u16 ch_number = XPC_UNPACK_ARG2(args); |
| 747 | struct xpc_partition *part = &xpc_partitions[partid]; |
| 748 | struct xpc_channel *ch; |
| 749 | int n_needed; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 750 | unsigned long irq_flags; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 751 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 752 | dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n", |
| 753 | partid, ch_number); |
| 754 | |
| 755 | ch = &part->channels[ch_number]; |
| 756 | |
| 757 | if (!(ch->flags & XPC_C_DISCONNECTING)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 758 | |
| 759 | /* let registerer know that connection has been established */ |
| 760 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 761 | spin_lock_irqsave(&ch->lock, irq_flags); |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 762 | if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) { |
| 763 | ch->flags |= XPC_C_CONNECTEDCALLOUT; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 764 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 765 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 766 | xpc_connected_callout(ch); |
| 767 | |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 768 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 769 | ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE; |
| 770 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 771 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 772 | /* |
| 773 | * It is possible that while the callout was being |
| 774 | * made that the remote partition sent some messages. |
| 775 | * If that is the case, we may need to activate |
| 776 | * additional kthreads to help deliver them. We only |
| 777 | * need one less than total #of messages to deliver. |
| 778 | */ |
Dean Nelson | bd3e64c | 2008-07-29 22:34:19 -0700 | [diff] [blame] | 779 | n_needed = xpc_n_of_deliverable_payloads(ch) - 1; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 780 | if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING)) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 781 | xpc_activate_kthreads(ch, n_needed); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 782 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 783 | } else { |
| 784 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 785 | } |
| 786 | |
| 787 | xpc_kthread_waitmsgs(part, ch); |
| 788 | } |
| 789 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 790 | /* let registerer know that connection is disconnecting */ |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 791 | |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 792 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 793 | if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) && |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 794 | !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) { |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 795 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT; |
Dean Nelson | 4c2cd96 | 2006-02-15 08:02:21 -0600 | [diff] [blame] | 796 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 797 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 798 | xpc_disconnect_callout(ch, xpDisconnecting); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 799 | |
| 800 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 801 | ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE; |
| 802 | } |
| 803 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 804 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 805 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
| 806 | atomic_dec_return(&part->nchannels_engaged) == 0) { |
| 807 | xpc_indicate_partition_disengaged(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 808 | } |
| 809 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 810 | xpc_msgqueue_deref(ch); |
| 811 | |
| 812 | dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n", |
| 813 | partid, ch_number); |
| 814 | |
| 815 | xpc_part_deref(part); |
| 816 | return 0; |
| 817 | } |
| 818 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 819 | /* |
| 820 | * For each partition that XPC has established communications with, there is |
| 821 | * a minimum of one kernel thread assigned to perform any operation that |
| 822 | * may potentially sleep or block (basically the callouts to the asynchronous |
| 823 | * functions registered via xpc_connect()). |
| 824 | * |
| 825 | * Additional kthreads are created and destroyed by XPC as the workload |
| 826 | * demands. |
| 827 | * |
| 828 | * A kthread is assigned to one of the active channels that exists for a given |
| 829 | * partition. |
| 830 | */ |
| 831 | void |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 832 | xpc_create_kthreads(struct xpc_channel *ch, int needed, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 833 | int ignore_disconnecting) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 834 | { |
| 835 | unsigned long irq_flags; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 836 | u64 args = XPC_PACK_ARGS(ch->partid, ch->number); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 837 | struct xpc_partition *part = &xpc_partitions[ch->partid]; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 838 | struct task_struct *kthread; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 839 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 840 | while (needed-- > 0) { |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 841 | |
| 842 | /* |
| 843 | * The following is done on behalf of the newly created |
| 844 | * kthread. That kthread is responsible for doing the |
| 845 | * counterpart to the following before it exits. |
| 846 | */ |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 847 | if (ignore_disconnecting) { |
| 848 | if (!atomic_inc_not_zero(&ch->kthreads_assigned)) { |
| 849 | /* kthreads assigned had gone to zero */ |
| 850 | BUG_ON(!(ch->flags & |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 851 | XPC_C_DISCONNECTINGCALLOUT_MADE)); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 852 | break; |
| 853 | } |
| 854 | |
| 855 | } else if (ch->flags & XPC_C_DISCONNECTING) { |
| 856 | break; |
| 857 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 858 | } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 && |
| 859 | atomic_inc_return(&part->nchannels_engaged) == 1) { |
| 860 | xpc_indicate_partition_engaged(part); |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 861 | } |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 862 | (void)xpc_part_ref(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 863 | xpc_msgqueue_ref(ch); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 864 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 865 | kthread = kthread_run(xpc_kthread_start, (void *)args, |
| 866 | "xpc%02dc%d", ch->partid, ch->number); |
| 867 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 868 | /* the fork failed */ |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 869 | |
| 870 | /* |
| 871 | * NOTE: if (ignore_disconnecting && |
| 872 | * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true, |
| 873 | * then we'll deadlock if all other kthreads assigned |
| 874 | * to this channel are blocked in the channel's |
| 875 | * registerer, because the only thing that will unblock |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 876 | * them is the xpDisconnecting callout that this |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 877 | * failed kthread_run() would have made. |
Dean Nelson | a460ef8 | 2006-11-22 08:25:00 -0600 | [diff] [blame] | 878 | */ |
| 879 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 880 | if (atomic_dec_return(&ch->kthreads_assigned) == 0 && |
| 881 | atomic_dec_return(&part->nchannels_engaged) == 0) { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 882 | xpc_indicate_partition_disengaged(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 883 | } |
| 884 | xpc_msgqueue_deref(ch); |
| 885 | xpc_part_deref(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 886 | |
| 887 | if (atomic_read(&ch->kthreads_assigned) < |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 888 | ch->kthreads_idle_limit) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 889 | /* |
| 890 | * Flag this as an error only if we have an |
| 891 | * insufficient #of kthreads for the channel |
| 892 | * to function. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 893 | */ |
| 894 | spin_lock_irqsave(&ch->lock, irq_flags); |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 895 | XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources, |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 896 | &irq_flags); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 897 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 898 | } |
| 899 | break; |
| 900 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 901 | } |
| 902 | } |
| 903 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 904 | void |
| 905 | xpc_disconnect_wait(int ch_number) |
| 906 | { |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 907 | unsigned long irq_flags; |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 908 | short partid; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 909 | struct xpc_partition *part; |
| 910 | struct xpc_channel *ch; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 911 | int wakeup_channel_mgr; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 912 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 913 | /* now wait for all callouts to the caller's function to cease */ |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 914 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 915 | part = &xpc_partitions[partid]; |
| 916 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 917 | if (!xpc_part_ref(part)) |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 918 | continue; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 919 | |
| 920 | ch = &part->channels[ch_number]; |
| 921 | |
| 922 | if (!(ch->flags & XPC_C_WDISCONNECT)) { |
| 923 | xpc_part_deref(part); |
| 924 | continue; |
| 925 | } |
| 926 | |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 927 | wait_for_completion(&ch->wdisconnect_wait); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 928 | |
| 929 | spin_lock_irqsave(&ch->lock, irq_flags); |
| 930 | DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED)); |
| 931 | wakeup_channel_mgr = 0; |
| 932 | |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 933 | if (ch->delayed_chctl_flags) { |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 934 | if (part->act_state != XPC_P_AS_DEACTIVATING) { |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 935 | spin_lock(&part->chctl_lock); |
| 936 | part->chctl.flags[ch->number] |= |
| 937 | ch->delayed_chctl_flags; |
| 938 | spin_unlock(&part->chctl_lock); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 939 | wakeup_channel_mgr = 1; |
| 940 | } |
Dean Nelson | 7fb5e59 | 2008-07-29 22:34:10 -0700 | [diff] [blame] | 941 | ch->delayed_chctl_flags = 0; |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 942 | } |
| 943 | |
| 944 | ch->flags &= ~XPC_C_WDISCONNECT; |
| 945 | spin_unlock_irqrestore(&ch->lock, irq_flags); |
| 946 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 947 | if (wakeup_channel_mgr) |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 948 | xpc_wakeup_channel_mgr(part); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 949 | |
| 950 | xpc_part_deref(part); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 951 | } |
| 952 | } |
| 953 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 954 | static int |
| 955 | xpc_setup_partitions(void) |
| 956 | { |
| 957 | short partid; |
| 958 | struct xpc_partition *part; |
| 959 | |
| 960 | xpc_partitions = kzalloc(sizeof(struct xpc_partition) * |
| 961 | xp_max_npartitions, GFP_KERNEL); |
| 962 | if (xpc_partitions == NULL) { |
| 963 | dev_err(xpc_part, "can't get memory for partition structure\n"); |
| 964 | return -ENOMEM; |
| 965 | } |
| 966 | |
| 967 | /* |
| 968 | * The first few fields of each entry of xpc_partitions[] need to |
| 969 | * be initialized now so that calls to xpc_connect() and |
| 970 | * xpc_disconnect() can be made prior to the activation of any remote |
| 971 | * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE |
| 972 | * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING |
| 973 | * PARTITION HAS BEEN ACTIVATED. |
| 974 | */ |
| 975 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
| 976 | part = &xpc_partitions[partid]; |
| 977 | |
| 978 | DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part)); |
| 979 | |
| 980 | part->activate_IRQ_rcvd = 0; |
| 981 | spin_lock_init(&part->act_lock); |
| 982 | part->act_state = XPC_P_AS_INACTIVE; |
| 983 | XPC_SET_REASON(part, 0, 0); |
| 984 | |
| 985 | init_timer(&part->disengage_timer); |
| 986 | part->disengage_timer.function = |
| 987 | xpc_timeout_partition_disengage; |
| 988 | part->disengage_timer.data = (unsigned long)part; |
| 989 | |
| 990 | part->setup_state = XPC_P_SS_UNSET; |
| 991 | init_waitqueue_head(&part->teardown_wq); |
| 992 | atomic_set(&part->references, 0); |
| 993 | } |
| 994 | |
| 995 | return xpc_setup_partitions_sn(); |
| 996 | } |
| 997 | |
| 998 | static void |
| 999 | xpc_teardown_partitions(void) |
| 1000 | { |
| 1001 | kfree(xpc_partitions); |
| 1002 | } |
| 1003 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1004 | static void |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1005 | xpc_do_exit(enum xp_retval reason) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1006 | { |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 1007 | short partid; |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1008 | int active_part_count, printed_waiting_msg = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1009 | struct xpc_partition *part; |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1010 | unsigned long printmsg_time, disengage_timeout = 0; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1011 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1012 | /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */ |
| 1013 | DBUG_ON(xpc_exiting == 1); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1014 | |
| 1015 | /* |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1016 | * Let the heartbeat checker thread and the discovery thread |
| 1017 | * (if one is running) know that they should exit. Also wake up |
| 1018 | * the heartbeat checker thread in case it's sleeping. |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1019 | */ |
| 1020 | xpc_exiting = 1; |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1021 | wake_up_interruptible(&xpc_activate_IRQ_wq); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1022 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 1023 | /* wait for the discovery thread to exit */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 1024 | wait_for_completion(&xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1025 | |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 1026 | /* wait for the heartbeat checker thread to exit */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 1027 | wait_for_completion(&xpc_hb_checker_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1028 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1029 | /* sleep for a 1/3 of a second or so */ |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1030 | (void)msleep_interruptible(300); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1031 | |
| 1032 | /* wait for all partitions to become inactive */ |
| 1033 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1034 | printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
| 1035 | xpc_disengage_timedout = 0; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1036 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1037 | do { |
| 1038 | active_part_count = 0; |
| 1039 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1040 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1041 | part = &xpc_partitions[partid]; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1042 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1043 | if (xpc_partition_disengaged(part) && |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1044 | part->act_state == XPC_P_AS_INACTIVE) { |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1045 | continue; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1046 | } |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1047 | |
| 1048 | active_part_count++; |
| 1049 | |
| 1050 | XPC_DEACTIVATE_PARTITION(part, reason); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1051 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1052 | if (part->disengage_timeout > disengage_timeout) |
| 1053 | disengage_timeout = part->disengage_timeout; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1054 | } |
| 1055 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1056 | if (xpc_any_partition_engaged()) { |
Dean Nelson | aaa3cd6 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 1057 | if (time_is_before_jiffies(printmsg_time)) { |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1058 | dev_info(xpc_part, "waiting for remote " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1059 | "partitions to deactivate, timeout in " |
| 1060 | "%ld seconds\n", (disengage_timeout - |
| 1061 | jiffies) / HZ); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1062 | printmsg_time = jiffies + |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1063 | (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1064 | printed_waiting_msg = 1; |
| 1065 | } |
| 1066 | |
| 1067 | } else if (active_part_count > 0) { |
| 1068 | if (printed_waiting_msg) { |
| 1069 | dev_info(xpc_part, "waiting for local partition" |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1070 | " to deactivate\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1071 | printed_waiting_msg = 0; |
| 1072 | } |
| 1073 | |
| 1074 | } else { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1075 | if (!xpc_disengage_timedout) { |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1076 | dev_info(xpc_part, "all partitions have " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1077 | "deactivated\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1078 | } |
| 1079 | break; |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | /* sleep for a 1/3 of a second or so */ |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1083 | (void)msleep_interruptible(300); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1084 | |
| 1085 | } while (1); |
| 1086 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1087 | DBUG_ON(xpc_any_partition_engaged()); |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 1088 | DBUG_ON(xpc_any_hbs_allowed() != 0); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1089 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1090 | xpc_teardown_rsvd_page(); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1091 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1092 | if (reason == xpUnloading) { |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1093 | (void)unregister_die_notifier(&xpc_die_notifier); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1094 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | 0752c67 | 2006-01-10 11:07:19 -0600 | [diff] [blame] | 1095 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1096 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1097 | /* clear the interface to XPC's functions */ |
| 1098 | xpc_clear_interface(); |
| 1099 | |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1100 | if (xpc_sysctl) |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1101 | unregister_sysctl_table(xpc_sysctl); |
Dean Nelson | 7682a4c | 2006-08-08 15:03:29 -0500 | [diff] [blame] | 1102 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1103 | xpc_teardown_partitions(); |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1104 | |
| 1105 | if (is_shub()) |
| 1106 | xpc_exit_sn2(); |
Dean Nelson | b7f7b07 | 2008-10-29 14:01:12 -0700 | [diff] [blame] | 1107 | else if (is_uv()) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1108 | xpc_exit_uv(); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1109 | } |
| 1110 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1111 | /* |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1112 | * This function is called when the system is being rebooted. |
| 1113 | */ |
| 1114 | static int |
| 1115 | xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused) |
| 1116 | { |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1117 | enum xp_retval reason; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1118 | |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1119 | switch (event) { |
| 1120 | case SYS_RESTART: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1121 | reason = xpSystemReboot; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1122 | break; |
| 1123 | case SYS_HALT: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1124 | reason = xpSystemHalt; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1125 | break; |
| 1126 | case SYS_POWER_OFF: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1127 | reason = xpSystemPoweroff; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1128 | break; |
| 1129 | default: |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1130 | reason = xpSystemGoingDown; |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1131 | } |
| 1132 | |
| 1133 | xpc_do_exit(reason); |
| 1134 | return NOTIFY_DONE; |
| 1135 | } |
| 1136 | |
Dean Nelson | d6ad033 | 2006-01-10 11:08:55 -0600 | [diff] [blame] | 1137 | /* |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1138 | * Notify other partitions to deactivate from us by first disengaging from all |
| 1139 | * references to our memory. |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1140 | */ |
| 1141 | static void |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1142 | xpc_die_deactivate(void) |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1143 | { |
| 1144 | struct xpc_partition *part; |
Dean Nelson | 64d032b | 2008-05-12 14:02:03 -0700 | [diff] [blame] | 1145 | short partid; |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1146 | int any_engaged; |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1147 | long keep_waiting; |
| 1148 | long wait_to_print; |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1149 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1150 | /* keep xpc_hb_checker thread from doing anything (just in case) */ |
| 1151 | xpc_exiting = 1; |
| 1152 | |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 1153 | xpc_disallow_all_hbs(); /*indicate we're deactivated */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1154 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1155 | for (partid = 0; partid < xp_max_npartitions; partid++) { |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1156 | part = &xpc_partitions[partid]; |
| 1157 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1158 | if (xpc_partition_engaged(partid) || |
Dean Nelson | 83469b5 | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1159 | part->act_state != XPC_P_AS_INACTIVE) { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1160 | xpc_request_partition_deactivation(part); |
| 1161 | xpc_indicate_partition_disengaged(part); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1162 | } |
| 1163 | } |
| 1164 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1165 | /* |
| 1166 | * Though we requested that all other partitions deactivate from us, |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1167 | * we only wait until they've all disengaged or we've reached the |
| 1168 | * defined timelimit. |
| 1169 | * |
| 1170 | * Given that one iteration through the following while-loop takes |
| 1171 | * approximately 200 microseconds, calculate the #of loops to take |
| 1172 | * before bailing and the #of loops before printing a waiting message. |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1173 | */ |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1174 | keep_waiting = xpc_disengage_timelimit * 1000 * 5; |
| 1175 | wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5; |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1176 | |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1177 | while (1) { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1178 | any_engaged = xpc_any_partition_engaged(); |
| 1179 | if (!any_engaged) { |
| 1180 | dev_info(xpc_part, "all partitions have deactivated\n"); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1181 | break; |
| 1182 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1183 | |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1184 | if (!keep_waiting--) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1185 | for (partid = 0; partid < xp_max_npartitions; |
| 1186 | partid++) { |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1187 | if (xpc_partition_engaged(partid)) { |
| 1188 | dev_info(xpc_part, "deactivate from " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1189 | "remote partition %d timed " |
| 1190 | "out\n", partid); |
Dean Nelson | 1ecaded | 2006-01-06 09:48:21 -0600 | [diff] [blame] | 1191 | } |
| 1192 | } |
| 1193 | break; |
| 1194 | } |
| 1195 | |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1196 | if (!wait_to_print--) { |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1197 | dev_info(xpc_part, "waiting for remote partitions to " |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1198 | "deactivate, timeout in %ld seconds\n", |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1199 | keep_waiting / (1000 * 5)); |
| 1200 | wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * |
| 1201 | 1000 * 5; |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1202 | } |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1203 | |
| 1204 | udelay(200); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1205 | } |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1206 | } |
| 1207 | |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1208 | /* |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1209 | * This function is called when the system is being restarted or halted due |
| 1210 | * to some sort of system failure. If this is the case we need to notify the |
| 1211 | * other partitions to disengage from all references to our memory. |
| 1212 | * This function can also be called when our heartbeater could be offlined |
| 1213 | * for a time. In this case we need to notify other partitions to not worry |
| 1214 | * about the lack of a heartbeat. |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1215 | */ |
| 1216 | static int |
| 1217 | xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused) |
| 1218 | { |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1219 | #ifdef CONFIG_IA64 /* !!! temporary kludge */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1220 | switch (event) { |
| 1221 | case DIE_MACHINE_RESTART: |
| 1222 | case DIE_MACHINE_HALT: |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1223 | xpc_die_deactivate(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1224 | break; |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1225 | |
| 1226 | case DIE_KDEBUG_ENTER: |
| 1227 | /* Should lack of heartbeat be ignored by other partitions? */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1228 | if (!xpc_kdebug_ignore) |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1229 | break; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1230 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1231 | /* fall through */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1232 | case DIE_MCA_MONARCH_ENTER: |
| 1233 | case DIE_INIT_MONARCH_ENTER: |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 1234 | xpc_offline_heartbeat(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1235 | break; |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1236 | |
| 1237 | case DIE_KDEBUG_LEAVE: |
| 1238 | /* Is lack of heartbeat being ignored by other partitions? */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1239 | if (!xpc_kdebug_ignore) |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1240 | break; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1241 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1242 | /* fall through */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1243 | case DIE_MCA_MONARCH_LEAVE: |
| 1244 | case DIE_INIT_MONARCH_LEAVE: |
Dean Nelson | 33ba3c7 | 2008-07-29 22:34:07 -0700 | [diff] [blame] | 1245 | xpc_online_heartbeat(); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1246 | break; |
| 1247 | } |
Dean Nelson | 261f3b4 | 2008-07-29 22:34:16 -0700 | [diff] [blame] | 1248 | #else |
| 1249 | xpc_die_deactivate(); |
| 1250 | #endif |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1251 | |
| 1252 | return NOTIFY_DONE; |
| 1253 | } |
| 1254 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1255 | int __init |
| 1256 | xpc_init(void) |
| 1257 | { |
| 1258 | int ret; |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1259 | struct task_struct *kthread; |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1260 | |
Kay Sievers | bb0dc43 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 1261 | dev_set_name(xpc_part, "part"); |
| 1262 | dev_set_name(xpc_chan, "chan"); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1263 | |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1264 | if (is_shub()) { |
| 1265 | /* |
| 1266 | * The ia64-sn2 architecture supports at most 64 partitions. |
Dean Nelson | c39838c | 2008-07-29 22:34:11 -0700 | [diff] [blame] | 1267 | * And the inability to unregister remote amos restricts us |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1268 | * further to only support exactly 64 partitions on this |
| 1269 | * architecture, no less. |
| 1270 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1271 | if (xp_max_npartitions != 64) { |
| 1272 | dev_err(xpc_part, "max #of partitions not set to 64\n"); |
| 1273 | ret = -EINVAL; |
| 1274 | } else { |
| 1275 | ret = xpc_init_sn2(); |
| 1276 | } |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1277 | |
| 1278 | } else if (is_uv()) { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1279 | ret = xpc_init_uv(); |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1280 | |
| 1281 | } else { |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1282 | ret = -ENODEV; |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1283 | } |
Dean Nelson | 408865c | 2005-09-08 10:46:58 -0500 | [diff] [blame] | 1284 | |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1285 | if (ret != 0) |
| 1286 | return ret; |
| 1287 | |
| 1288 | ret = xpc_setup_partitions(); |
| 1289 | if (ret != 0) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1290 | dev_err(xpc_part, "can't get memory for partition structure\n"); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1291 | goto out_1; |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1292 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1293 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1294 | xpc_sysctl = register_sysctl_table(xpc_sys_dir); |
| 1295 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1296 | /* |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1297 | * Fill the partition reserved page with the information needed by |
| 1298 | * other partitions to discover we are alive and establish initial |
| 1299 | * communications. |
| 1300 | */ |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1301 | ret = xpc_setup_rsvd_page(); |
| 1302 | if (ret != 0) { |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1303 | dev_err(xpc_part, "can't setup our reserved page\n"); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1304 | goto out_2; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1305 | } |
| 1306 | |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1307 | /* add ourselves to the reboot_notifier_list */ |
| 1308 | ret = register_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1309 | if (ret != 0) |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1310 | dev_warn(xpc_part, "can't register reboot notifier\n"); |
Dean Nelson | a607c38 | 2005-09-01 14:01:37 -0500 | [diff] [blame] | 1311 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 1312 | /* add ourselves to the die_notifier list */ |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1313 | ret = register_die_notifier(&xpc_die_notifier); |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1314 | if (ret != 0) |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1315 | dev_warn(xpc_part, "can't register die notifier\n"); |
Dean Nelson | 780d09e | 2005-11-09 14:41:57 -0600 | [diff] [blame] | 1316 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1317 | /* |
| 1318 | * The real work-horse behind xpc. This processes incoming |
| 1319 | * interrupts and monitors remote heartbeats. |
| 1320 | */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1321 | kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME); |
| 1322 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1323 | dev_err(xpc_part, "failed while forking hb check thread\n"); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1324 | ret = -EBUSY; |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1325 | goto out_3; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1326 | } |
| 1327 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1328 | /* |
| 1329 | * Startup a thread that will attempt to discover other partitions to |
| 1330 | * activate based on info provided by SAL. This new thread is short |
| 1331 | * lived and will exit once discovery is complete. |
| 1332 | */ |
Dean Nelson | 2c2b94f | 2008-04-22 14:50:17 -0500 | [diff] [blame] | 1333 | kthread = kthread_run(xpc_initiate_discovery, NULL, |
| 1334 | XPC_DISCOVERY_THREAD_NAME); |
| 1335 | if (IS_ERR(kthread)) { |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1336 | dev_err(xpc_part, "failed while forking discovery thread\n"); |
| 1337 | |
| 1338 | /* mark this new thread as a non-starter */ |
Jes Sorensen | f9e505a | 2006-01-17 12:52:21 -0500 | [diff] [blame] | 1339 | complete(&xpc_discovery_exited); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1340 | |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1341 | xpc_do_exit(xpUnloading); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1342 | return -EBUSY; |
| 1343 | } |
| 1344 | |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1345 | /* set the interface to point at XPC's functions */ |
| 1346 | xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect, |
Dean Nelson | 97bf1aa | 2008-07-29 22:34:08 -0700 | [diff] [blame] | 1347 | xpc_initiate_send, xpc_initiate_send_notify, |
| 1348 | xpc_initiate_received, xpc_initiate_partid_to_nasids); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1349 | |
| 1350 | return 0; |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1351 | |
| 1352 | /* initialization was not successful */ |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1353 | out_3: |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1354 | xpc_teardown_rsvd_page(); |
Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame] | 1355 | |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1356 | (void)unregister_die_notifier(&xpc_die_notifier); |
| 1357 | (void)unregister_reboot_notifier(&xpc_reboot_notifier); |
Dean Nelson | ee6665e | 2008-07-29 22:34:13 -0700 | [diff] [blame] | 1358 | out_2: |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1359 | if (xpc_sysctl) |
| 1360 | unregister_sysctl_table(xpc_sysctl); |
Dean Nelson | 5b8669d | 2008-07-29 22:34:18 -0700 | [diff] [blame] | 1361 | |
| 1362 | xpc_teardown_partitions(); |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1363 | out_1: |
| 1364 | if (is_shub()) |
| 1365 | xpc_exit_sn2(); |
Dean Nelson | b7f7b07 | 2008-10-29 14:01:12 -0700 | [diff] [blame] | 1366 | else if (is_uv()) |
Dean Nelson | 6e41017 | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1367 | xpc_exit_uv(); |
Dean Nelson | bc63d38 | 2008-07-29 22:34:04 -0700 | [diff] [blame] | 1368 | return ret; |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1369 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1370 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1371 | module_init(xpc_init); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1372 | |
| 1373 | void __exit |
| 1374 | xpc_exit(void) |
| 1375 | { |
Dean Nelson | 65c17b8 | 2008-05-12 14:02:02 -0700 | [diff] [blame] | 1376 | xpc_do_exit(xpUnloading); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1377 | } |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1378 | |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1379 | module_exit(xpc_exit); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1380 | |
| 1381 | MODULE_AUTHOR("Silicon Graphics, Inc."); |
| 1382 | MODULE_DESCRIPTION("Cross Partition Communication (XPC) support"); |
| 1383 | MODULE_LICENSE("GPL"); |
| 1384 | |
| 1385 | module_param(xpc_hb_interval, int, 0); |
| 1386 | MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1387 | "heartbeat increments."); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1388 | |
| 1389 | module_param(xpc_hb_check_interval, int, 0); |
| 1390 | MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between " |
Dean Nelson | 3519050 | 2008-04-22 14:48:55 -0500 | [diff] [blame] | 1391 | "heartbeat checks."); |
Dean Nelson | 89eb8eb | 2005-03-23 19:50:00 -0700 | [diff] [blame] | 1392 | |
Dean Nelson | a47d5da | 2008-07-29 22:34:09 -0700 | [diff] [blame] | 1393 | module_param(xpc_disengage_timelimit, int, 0); |
| 1394 | MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait " |
| 1395 | "for disengage to complete."); |
Dean Nelson | e54af72 | 2005-10-25 14:07:43 -0500 | [diff] [blame] | 1396 | |
Dean Nelson | 1f4674b | 2006-01-10 11:08:00 -0600 | [diff] [blame] | 1397 | module_param(xpc_kdebug_ignore, int, 0); |
| 1398 | 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] | 1399 | "other partitions when dropping into kdebug."); |