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/*
* This file is subject to the terms and conditions of the GNU General Public
* License . See the file " COPYING " in the main directory of this archive
* for more details .
*
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* Copyright ( c ) 2004 - 2008 Silicon Graphics , Inc . All Rights Reserved .
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*/
/*
* Cross Partition Communication ( XPC ) support - standard version .
*
* XPC provides a message passing capability that crosses partition
* boundaries . This module is made up of two parts :
*
* partition This part detects the presence / absence of other
* partitions . It provides a heartbeat and monitors
* the heartbeats of other partitions .
*
* channel This part manages the channels and sends / receives
* messages across them to / from other partitions .
*
* There are a couple of additional functions residing in XP , which
* provide an interface to XPC for its users .
*
*
* Caveats :
*
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* . Currently on sn2 , we have no way to determine which nasid an IRQ
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* came from . Thus , xpc_send_IRQ_sn2 ( ) does a remote amo write
* followed by an IPI . The amo indicates where data is to be pulled
* from , so after the IPI arrives , the remote partition checks the amo
* word . The IPI can actually arrive before the amo however , so other
* code must periodically check for this case . Also , remote amo
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* operations do not reliably time out . Thus we do a remote PIO read
* solely to know whether the remote partition is down and whether we
* should stop sending IPIs to it . This remote PIO read operation is
* set up in a special nofault region so SAL knows to ignore ( and
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* cleanup ) any errors due to the remote amo write , PIO read , and / or
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* PIO write operations .
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*
* If / when new hardware solves this IPI problem , we should abandon
* the current approach .
*
*/
# include <linux/module.h>
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# include <linux/sysctl.h>
# include <linux/device.h>
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# include <linux/delay.h>
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# include <linux/reboot.h>
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# include <linux/kdebug.h>
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# include <linux/kthread.h>
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# include "xpc.h"
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/* define two XPC debug device structures to be used with dev_dbg() et al */
struct device_driver xpc_dbg_name = {
. name = " xpc "
} ;
struct device xpc_part_dbg_subname = {
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. init_name = " " , /* set to "part" at xpc_init() time */
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. driver = & xpc_dbg_name
} ;
struct device xpc_chan_dbg_subname = {
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. init_name = " " , /* set to "chan" at xpc_init() time */
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. driver = & xpc_dbg_name
} ;
struct device * xpc_part = & xpc_part_dbg_subname ;
struct device * xpc_chan = & xpc_chan_dbg_subname ;
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static int xpc_kdebug_ignore ;
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/* systune related variables for /proc/sys directories */
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static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL ;
static int xpc_hb_min_interval = 1 ;
static int xpc_hb_max_interval = 10 ;
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static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL ;
static int xpc_hb_check_min_interval = 10 ;
static int xpc_hb_check_max_interval = 120 ;
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int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT ;
static int xpc_disengage_min_timelimit ; /* = 0 */
static int xpc_disengage_max_timelimit = 120 ;
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static ctl_table xpc_sys_xpc_hb_dir [ ] = {
{
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. ctl_name = CTL_UNNUMBERED ,
. procname = " hb_interval " ,
. data = & xpc_hb_interval ,
. maxlen = sizeof ( int ) ,
. mode = 0644 ,
. proc_handler = & proc_dointvec_minmax ,
. strategy = & sysctl_intvec ,
. extra1 = & xpc_hb_min_interval ,
. extra2 = & xpc_hb_max_interval } ,
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{
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. ctl_name = CTL_UNNUMBERED ,
. procname = " hb_check_interval " ,
. data = & xpc_hb_check_interval ,
. maxlen = sizeof ( int ) ,
. mode = 0644 ,
. proc_handler = & proc_dointvec_minmax ,
. strategy = & sysctl_intvec ,
. extra1 = & xpc_hb_check_min_interval ,
. extra2 = & xpc_hb_check_max_interval } ,
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{ }
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} ;
static ctl_table xpc_sys_xpc_dir [ ] = {
{
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. ctl_name = CTL_UNNUMBERED ,
. procname = " hb " ,
. mode = 0555 ,
. child = xpc_sys_xpc_hb_dir } ,
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{
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. ctl_name = CTL_UNNUMBERED ,
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. procname = " disengage_timelimit " ,
. data = & xpc_disengage_timelimit ,
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. maxlen = sizeof ( int ) ,
. mode = 0644 ,
. proc_handler = & proc_dointvec_minmax ,
. strategy = & sysctl_intvec ,
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. extra1 = & xpc_disengage_min_timelimit ,
. extra2 = & xpc_disengage_max_timelimit } ,
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{ }
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} ;
static ctl_table xpc_sys_dir [ ] = {
{
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. ctl_name = CTL_UNNUMBERED ,
. procname = " xpc " ,
. mode = 0555 ,
. child = xpc_sys_xpc_dir } ,
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{ }
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} ;
static struct ctl_table_header * xpc_sysctl ;
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/* non-zero if any remote partition disengage was timed out */
int xpc_disengage_timedout ;
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/* #of activate IRQs received and not yet processed */
int xpc_activate_IRQ_rcvd ;
DEFINE_SPINLOCK ( xpc_activate_IRQ_rcvd_lock ) ;
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/* IRQ handler notifies this wait queue on receipt of an IRQ */
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DECLARE_WAIT_QUEUE_HEAD ( xpc_activate_IRQ_wq ) ;
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static unsigned long xpc_hb_check_timeout ;
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static struct timer_list xpc_hb_timer ;
void * xpc_heartbeating_to_mask ;
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/* notification that the xpc_hb_checker thread has exited */
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static DECLARE_COMPLETION ( xpc_hb_checker_exited ) ;
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/* notification that the xpc_discovery thread has exited */
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static DECLARE_COMPLETION ( xpc_discovery_exited ) ;
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static void xpc_kthread_waitmsgs ( struct xpc_partition * , struct xpc_channel * ) ;
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static int xpc_system_reboot ( struct notifier_block * , unsigned long , void * ) ;
static struct notifier_block xpc_reboot_notifier = {
. notifier_call = xpc_system_reboot ,
} ;
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static int xpc_system_die ( struct notifier_block * , unsigned long , void * ) ;
static struct notifier_block xpc_die_notifier = {
. notifier_call = xpc_system_die ,
} ;
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int ( * xpc_setup_partitions_sn ) ( void ) ;
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void ( * xpc_teardown_partitions_sn ) ( void ) ;
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enum xp_retval ( * xpc_get_partition_rsvd_page_pa ) ( void * buf , u64 * cookie ,
unsigned long * rp_pa ,
size_t * len ) ;
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int ( * xpc_setup_rsvd_page_sn ) ( struct xpc_rsvd_page * rp ) ;
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void ( * xpc_heartbeat_init ) ( void ) ;
void ( * xpc_heartbeat_exit ) ( void ) ;
void ( * xpc_increment_heartbeat ) ( void ) ;
void ( * xpc_offline_heartbeat ) ( void ) ;
void ( * xpc_online_heartbeat ) ( void ) ;
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enum xp_retval ( * xpc_get_remote_heartbeat ) ( struct xpc_partition * part ) ;
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enum xp_retval ( * xpc_make_first_contact ) ( struct xpc_partition * part ) ;
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void ( * xpc_notify_senders_of_disconnect ) ( struct xpc_channel * ch ) ;
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u64 ( * xpc_get_chctl_all_flags ) ( struct xpc_partition * part ) ;
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enum xp_retval ( * xpc_setup_msg_structures ) ( struct xpc_channel * ch ) ;
void ( * xpc_teardown_msg_structures ) ( struct xpc_channel * ch ) ;
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void ( * xpc_process_msg_chctl_flags ) ( struct xpc_partition * part , int ch_number ) ;
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int ( * xpc_n_of_deliverable_payloads ) ( struct xpc_channel * ch ) ;
void * ( * xpc_get_deliverable_payload ) ( struct xpc_channel * ch ) ;
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void ( * xpc_request_partition_activation ) ( struct xpc_rsvd_page * remote_rp ,
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unsigned long remote_rp_pa ,
int nasid ) ;
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void ( * xpc_request_partition_reactivation ) ( struct xpc_partition * part ) ;
void ( * xpc_request_partition_deactivation ) ( struct xpc_partition * part ) ;
void ( * xpc_cancel_partition_deactivation_request ) ( struct xpc_partition * part ) ;
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void ( * xpc_process_activate_IRQ_rcvd ) ( void ) ;
enum xp_retval ( * xpc_setup_ch_structures_sn ) ( struct xpc_partition * part ) ;
void ( * xpc_teardown_ch_structures_sn ) ( struct xpc_partition * part ) ;
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void ( * xpc_indicate_partition_engaged ) ( struct xpc_partition * part ) ;
int ( * xpc_partition_engaged ) ( short partid ) ;
int ( * xpc_any_partition_engaged ) ( void ) ;
void ( * xpc_indicate_partition_disengaged ) ( struct xpc_partition * part ) ;
void ( * xpc_assume_partition_disengaged ) ( short partid ) ;
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void ( * xpc_send_chctl_closerequest ) ( struct xpc_channel * ch ,
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unsigned long * irq_flags ) ;
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void ( * xpc_send_chctl_closereply ) ( struct xpc_channel * ch ,
unsigned long * irq_flags ) ;
void ( * xpc_send_chctl_openrequest ) ( struct xpc_channel * ch ,
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unsigned long * irq_flags ) ;
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void ( * xpc_send_chctl_openreply ) ( struct xpc_channel * ch ,
unsigned long * irq_flags ) ;
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enum xp_retval ( * xpc_save_remote_msgqueue_pa ) ( struct xpc_channel * ch ,
unsigned long msgqueue_pa ) ;
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enum xp_retval ( * xpc_send_payload ) ( struct xpc_channel * ch , u32 flags ,
void * payload , u16 payload_size ,
u8 notify_type , xpc_notify_func func ,
void * key ) ;
void ( * xpc_received_payload ) ( struct xpc_channel * ch , void * payload ) ;
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/*
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* Timer function to enforce the timelimit on the partition disengage .
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*/
static void
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xpc_timeout_partition_disengage ( unsigned long data )
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{
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struct xpc_partition * part = ( struct xpc_partition * ) data ;
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DBUG_ON ( time_is_after_jiffies ( part - > disengage_timeout ) ) ;
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( void ) xpc_partition_disengaged ( part ) ;
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DBUG_ON ( part - > disengage_timeout ! = 0 ) ;
DBUG_ON ( xpc_partition_engaged ( XPC_PARTID ( part ) ) ) ;
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}
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/*
* Timer to produce the heartbeat . The timer structures function is
* already set when this is initially called . A tunable is used to
* specify when the next timeout should occur .
*/
static void
xpc_hb_beater ( unsigned long dummy )
{
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xpc_increment_heartbeat ( ) ;
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if ( time_is_before_eq_jiffies ( xpc_hb_check_timeout ) )
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wake_up_interruptible ( & xpc_activate_IRQ_wq ) ;
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xpc_hb_timer . expires = jiffies + ( xpc_hb_interval * HZ ) ;
add_timer ( & xpc_hb_timer ) ;
}
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static void
xpc_start_hb_beater ( void )
{
xpc_heartbeat_init ( ) ;
init_timer ( & xpc_hb_timer ) ;
xpc_hb_timer . function = xpc_hb_beater ;
xpc_hb_beater ( 0 ) ;
}
static void
xpc_stop_hb_beater ( void )
{
del_timer_sync ( & xpc_hb_timer ) ;
xpc_heartbeat_exit ( ) ;
}
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/*
* At periodic intervals , scan through all active partitions and ensure
* their heartbeat is still active . If not , the partition is deactivated .
*/
static void
xpc_check_remote_hb ( void )
{
struct xpc_partition * part ;
short partid ;
enum xp_retval ret ;
for ( partid = 0 ; partid < xp_max_npartitions ; partid + + ) {
if ( xpc_exiting )
break ;
if ( partid = = xp_partition_id )
continue ;
part = & xpc_partitions [ partid ] ;
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if ( part - > act_state = = XPC_P_AS_INACTIVE | |
part - > act_state = = XPC_P_AS_DEACTIVATING ) {
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continue ;
}
ret = xpc_get_remote_heartbeat ( part ) ;
if ( ret ! = xpSuccess )
XPC_DEACTIVATE_PARTITION ( part , ret ) ;
}
}
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/*
* This thread is responsible for nearly all of the partition
* activation / deactivation .
*/
static int
xpc_hb_checker ( void * ignore )
{
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int force_IRQ = 0 ;
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/* this thread was marked active by xpc_hb_init() */
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set_cpus_allowed_ptr ( current , cpumask_of ( XPC_HB_CHECK_CPU ) ) ;
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/* set our heartbeating to other partitions into motion */
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xpc_hb_check_timeout = jiffies + ( xpc_hb_check_interval * HZ ) ;
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xpc_start_hb_beater ( ) ;
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while ( ! xpc_exiting ) {
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dev_dbg ( xpc_part , " woke up with %d ticks rem; %d IRQs have "
" been received \n " ,
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( int ) ( xpc_hb_check_timeout - jiffies ) ,
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xpc_activate_IRQ_rcvd ) ;
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/* checking of remote heartbeats is skewed by IRQ handling */
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if ( time_is_before_eq_jiffies ( xpc_hb_check_timeout ) ) {
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xpc_hb_check_timeout = jiffies +
( xpc_hb_check_interval * HZ ) ;
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dev_dbg ( xpc_part , " checking remote heartbeats \n " ) ;
xpc_check_remote_hb ( ) ;
/*
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* On sn2 we need to periodically recheck to ensure no
* IRQ / amo pairs have been missed .
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*/
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if ( is_shub ( ) )
force_IRQ = 1 ;
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}
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/* check for outstanding IRQs */
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if ( xpc_activate_IRQ_rcvd > 0 | | force_IRQ ! = 0 ) {
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force_IRQ = 0 ;
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dev_dbg ( xpc_part , " processing activate IRQs "
" received \n " ) ;
xpc_process_activate_IRQ_rcvd ( ) ;
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}
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/* wait for IRQ or timeout */
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( void ) wait_event_interruptible ( xpc_activate_IRQ_wq ,
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( time_is_before_eq_jiffies (
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xpc_hb_check_timeout ) | |
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xpc_activate_IRQ_rcvd > 0 | |
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xpc_exiting ) ) ;
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}
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xpc_stop_hb_beater ( ) ;
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dev_dbg ( xpc_part , " heartbeat checker is exiting \n " ) ;
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/* mark this thread as having exited */
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complete ( & xpc_hb_checker_exited ) ;
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return 0 ;
}
/*
* This thread will attempt to discover other partitions to activate
* based on info provided by SAL . This new thread is short lived and
* will exit once discovery is complete .
*/
static int
xpc_initiate_discovery ( void * ignore )
{
xpc_discovery ( ) ;
dev_dbg ( xpc_part , " discovery thread is exiting \n " ) ;
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/* mark this thread as having exited */
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complete ( & xpc_discovery_exited ) ;
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return 0 ;
}
/*
* The first kthread assigned to a newly activated partition is the one
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* created by XPC HB with which it calls xpc_activating ( ) . XPC hangs on to
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* that kthread until the partition is brought down , at which time that kthread
* returns back to XPC HB . ( The return of that kthread will signify to XPC HB
* that XPC has dismantled all communication infrastructure for the associated
* partition . ) This kthread becomes the channel manager for that partition .
*
* Each active partition has a channel manager , who , besides connecting and
* disconnecting channels , will ensure that each of the partition ' s connected
* channels has the required number of assigned kthreads to get the work done .
*/
static void
xpc_channel_mgr ( struct xpc_partition * part )
{
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while ( part - > act_state ! = XPC_P_AS_DEACTIVATING | |
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atomic_read ( & part - > nchannels_active ) > 0 | |
! xpc_partition_disengaged ( part ) ) {
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xpc_process_sent_chctl_flags ( part ) ;
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/*
* Wait until we ' ve been requested to activate kthreads or
* all of the channel ' s message queues have been torn down or
* a signal is pending .
*
* The channel_mgr_requests is set to 1 after being awakened ,
* This is done to prevent the channel mgr from making one pass
* through the loop for each request , since he will
* be servicing all the requests in one pass . The reason it ' s
* set to 1 instead of 0 is so that other kthreads will know
* that the channel mgr is running and won ' t bother trying to
* wake him up .
*/
atomic_dec ( & part - > channel_mgr_requests ) ;
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( void ) wait_event_interruptible ( part - > channel_mgr_wq ,
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( atomic_read ( & part - > channel_mgr_requests ) > 0 | |
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part - > chctl . all_flags ! = 0 | |
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( part - > act_state = = XPC_P_AS_DEACTIVATING & &
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atomic_read ( & part - > nchannels_active ) = = 0 & &
xpc_partition_disengaged ( part ) ) ) ) ;
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atomic_set ( & part - > channel_mgr_requests , 1 ) ;
}
}
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/*
* Guarantee that the kzalloc ' d memory is cacheline aligned .
*/
void *
xpc_kzalloc_cacheline_aligned ( size_t size , gfp_t flags , void * * base )
{
/* see if kzalloc will give us cachline aligned memory by default */
* base = kzalloc ( size , flags ) ;
if ( * base = = NULL )
return NULL ;
if ( ( u64 ) * base = = L1_CACHE_ALIGN ( ( u64 ) * base ) )
return * base ;
kfree ( * base ) ;
/* nope, we'll have to do it ourselves */
* base = kzalloc ( size + L1_CACHE_BYTES , flags ) ;
if ( * base = = NULL )
return NULL ;
return ( void * ) L1_CACHE_ALIGN ( ( u64 ) * base ) ;
}
/*
* Setup the channel structures necessary to support XPartition Communication
* between the specified remote partition and the local one .
*/
static enum xp_retval
xpc_setup_ch_structures ( struct xpc_partition * part )
{
enum xp_retval ret ;
int ch_number ;
struct xpc_channel * ch ;
short partid = XPC_PARTID ( part ) ;
/*
* Allocate all of the channel structures as a contiguous chunk of
* memory .
*/
DBUG_ON ( part - > channels ! = NULL ) ;
part - > channels = kzalloc ( sizeof ( struct xpc_channel ) * XPC_MAX_NCHANNELS ,
GFP_KERNEL ) ;
if ( part - > channels = = NULL ) {
dev_err ( xpc_chan , " can't get memory for channels \n " ) ;
return xpNoMemory ;
}
/* allocate the remote open and close args */
part - > remote_openclose_args =
xpc_kzalloc_cacheline_aligned ( XPC_OPENCLOSE_ARGS_SIZE ,
GFP_KERNEL , & part - >
remote_openclose_args_base ) ;
if ( part - > remote_openclose_args = = NULL ) {
dev_err ( xpc_chan , " can't get memory for remote connect args \n " ) ;
ret = xpNoMemory ;
goto out_1 ;
}
part - > chctl . all_flags = 0 ;
spin_lock_init ( & part - > chctl_lock ) ;
atomic_set ( & part - > channel_mgr_requests , 1 ) ;
init_waitqueue_head ( & part - > channel_mgr_wq ) ;
part - > nchannels = XPC_MAX_NCHANNELS ;
atomic_set ( & part - > nchannels_active , 0 ) ;
atomic_set ( & part - > nchannels_engaged , 0 ) ;
for ( ch_number = 0 ; ch_number < part - > nchannels ; ch_number + + ) {
ch = & part - > channels [ ch_number ] ;
ch - > partid = partid ;
ch - > number = ch_number ;
ch - > flags = XPC_C_DISCONNECTED ;
atomic_set ( & ch - > kthreads_assigned , 0 ) ;
atomic_set ( & ch - > kthreads_idle , 0 ) ;
atomic_set ( & ch - > kthreads_active , 0 ) ;
atomic_set ( & ch - > references , 0 ) ;
atomic_set ( & ch - > n_to_notify , 0 ) ;
spin_lock_init ( & ch - > lock ) ;
init_completion ( & ch - > wdisconnect_wait ) ;
atomic_set ( & ch - > n_on_msg_allocate_wq , 0 ) ;
init_waitqueue_head ( & ch - > msg_allocate_wq ) ;
init_waitqueue_head ( & ch - > idle_wq ) ;
}
ret = xpc_setup_ch_structures_sn ( part ) ;
if ( ret ! = xpSuccess )
goto out_2 ;
/*
* With the setting of the partition setup_state to XPC_P_SS_SETUP ,
* we ' re declaring that this partition is ready to go .
*/
part - > setup_state = XPC_P_SS_SETUP ;
return xpSuccess ;
/* setup of ch structures failed */
out_2 :
kfree ( part - > remote_openclose_args_base ) ;
part - > remote_openclose_args = NULL ;
out_1 :
kfree ( part - > channels ) ;
part - > channels = NULL ;
return ret ;
}
/*
* Teardown the channel structures necessary to support XPartition Communication
* between the specified remote partition and the local one .
*/
static void
xpc_teardown_ch_structures ( struct xpc_partition * part )
{
DBUG_ON ( atomic_read ( & part - > nchannels_engaged ) ! = 0 ) ;
DBUG_ON ( atomic_read ( & part - > nchannels_active ) ! = 0 ) ;
/*
* Make this partition inaccessible to local processes by marking it
* as no longer setup . Then wait before proceeding with the teardown
* until all existing references cease .
*/
DBUG_ON ( part - > setup_state ! = XPC_P_SS_SETUP ) ;
part - > setup_state = XPC_P_SS_WTEARDOWN ;
wait_event ( part - > teardown_wq , ( atomic_read ( & part - > references ) = = 0 ) ) ;
/* now we can begin tearing down the infrastructure */
xpc_teardown_ch_structures_sn ( part ) ;
kfree ( part - > remote_openclose_args_base ) ;
part - > remote_openclose_args = NULL ;
kfree ( part - > channels ) ;
part - > channels = NULL ;
part - > setup_state = XPC_P_SS_TORNDOWN ;
}
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/*
* When XPC HB determines that a partition has come up , it will create a new
* kthread and that kthread will call this function to attempt to set up the
* basic infrastructure used for Cross Partition Communication with the newly
* upped partition .
*
* The kthread that was created by XPC HB and which setup the XPC
2008-07-29 22:34:06 -07:00
* infrastructure will remain assigned to the partition becoming the channel
* manager for that partition until the partition is deactivating , at which
* time the kthread will teardown the XPC infrastructure and then exit .
2005-03-23 19:50:00 -07:00
*/
static int
xpc_activating ( void * __partid )
{
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short partid = ( u64 ) __partid ;
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struct xpc_partition * part = & xpc_partitions [ partid ] ;
unsigned long irq_flags ;
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DBUG_ON ( partid < 0 | | partid > = xp_max_npartitions ) ;
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spin_lock_irqsave ( & part - > act_lock , irq_flags ) ;
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if ( part - > act_state = = XPC_P_AS_DEACTIVATING ) {
part - > act_state = XPC_P_AS_INACTIVE ;
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spin_unlock_irqrestore ( & part - > act_lock , irq_flags ) ;
part - > remote_rp_pa = 0 ;
return 0 ;
}
/* indicate the thread is activating */
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DBUG_ON ( part - > act_state ! = XPC_P_AS_ACTIVATION_REQ ) ;
part - > act_state = XPC_P_AS_ACTIVATING ;
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XPC_SET_REASON ( part , 0 , 0 ) ;
spin_unlock_irqrestore ( & part - > act_lock , irq_flags ) ;
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dev_dbg ( xpc_part , " activating partition %d \n " , partid ) ;
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xpc_allow_hb ( partid ) ;
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if ( xpc_setup_ch_structures ( part ) = = xpSuccess ) {
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( void ) xpc_part_ref ( part ) ; /* this will always succeed */
if ( xpc_make_first_contact ( part ) = = xpSuccess ) {
xpc_mark_partition_active ( part ) ;
xpc_channel_mgr ( part ) ;
/* won't return until partition is deactivating */
}
xpc_part_deref ( part ) ;
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xpc_teardown_ch_structures ( part ) ;
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}
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2008-07-29 22:34:07 -07:00
xpc_disallow_hb ( partid ) ;
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xpc_mark_partition_inactive ( part ) ;
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if ( part - > reason = = xpReactivating ) {
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/* interrupting ourselves results in activating partition */
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xpc_request_partition_reactivation ( part ) ;
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}
return 0 ;
}
void
xpc_activate_partition ( struct xpc_partition * part )
{
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short partid = XPC_PARTID ( part ) ;
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unsigned long irq_flags ;
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struct task_struct * kthread ;
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spin_lock_irqsave ( & part - > act_lock , irq_flags ) ;
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DBUG_ON ( part - > act_state ! = XPC_P_AS_INACTIVE ) ;
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part - > act_state = XPC_P_AS_ACTIVATION_REQ ;
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XPC_SET_REASON ( part , xpCloneKThread , __LINE__ ) ;
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spin_unlock_irqrestore ( & part - > act_lock , irq_flags ) ;
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kthread = kthread_run ( xpc_activating , ( void * ) ( ( u64 ) partid ) , " xpc%02d " ,
partid ) ;
if ( IS_ERR ( kthread ) ) {
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spin_lock_irqsave ( & part - > act_lock , irq_flags ) ;
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part - > act_state = XPC_P_AS_INACTIVE ;
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XPC_SET_REASON ( part , xpCloneKThreadFailed , __LINE__ ) ;
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spin_unlock_irqrestore ( & part - > act_lock , irq_flags ) ;
}
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}
void
xpc_activate_kthreads ( struct xpc_channel * ch , int needed )
{
int idle = atomic_read ( & ch - > kthreads_idle ) ;
int assigned = atomic_read ( & ch - > kthreads_assigned ) ;
int wakeup ;
DBUG_ON ( needed < = 0 ) ;
if ( idle > 0 ) {
wakeup = ( needed > idle ) ? idle : needed ;
needed - = wakeup ;
dev_dbg ( xpc_chan , " wakeup %d idle kthreads, partid=%d, "
" channel=%d \n " , wakeup , ch - > partid , ch - > number ) ;
/* only wakeup the requested number of kthreads */
wake_up_nr ( & ch - > idle_wq , wakeup ) ;
}
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if ( needed < = 0 )
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return ;
if ( needed + assigned > ch - > kthreads_assigned_limit ) {
needed = ch - > kthreads_assigned_limit - assigned ;
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if ( needed < = 0 )
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return ;
}
dev_dbg ( xpc_chan , " create %d new kthreads, partid=%d, channel=%d \n " ,
needed , ch - > partid , ch - > number ) ;
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xpc_create_kthreads ( ch , needed , 0 ) ;
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}
/*
* This function is where XPC ' s kthreads wait for messages to deliver .
*/
static void
xpc_kthread_waitmsgs ( struct xpc_partition * part , struct xpc_channel * ch )
{
do {
/* deliver messages to their intended recipients */
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while ( xpc_n_of_deliverable_payloads ( ch ) > 0 & &
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! ( ch - > flags & XPC_C_DISCONNECTING ) ) {
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xpc_deliver_payload ( ch ) ;
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}
if ( atomic_inc_return ( & ch - > kthreads_idle ) >
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ch - > kthreads_idle_limit ) {
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/* too many idle kthreads on this channel */
atomic_dec ( & ch - > kthreads_idle ) ;
break ;
}
dev_dbg ( xpc_chan , " idle kthread calling "
" wait_event_interruptible_exclusive() \n " ) ;
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( void ) wait_event_interruptible_exclusive ( ch - > idle_wq ,
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( xpc_n_of_deliverable_payloads ( ch ) > 0 | |
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( ch - > flags & XPC_C_DISCONNECTING ) ) ) ;
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atomic_dec ( & ch - > kthreads_idle ) ;
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} while ( ! ( ch - > flags & XPC_C_DISCONNECTING ) ) ;
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}
static int
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xpc_kthread_start ( void * args )
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{
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short partid = XPC_UNPACK_ARG1 ( args ) ;
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u16 ch_number = XPC_UNPACK_ARG2 ( args ) ;
struct xpc_partition * part = & xpc_partitions [ partid ] ;
struct xpc_channel * ch ;
int n_needed ;
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unsigned long irq_flags ;
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dev_dbg ( xpc_chan , " kthread starting, partid=%d, channel=%d \n " ,
partid , ch_number ) ;
ch = & part - > channels [ ch_number ] ;
if ( ! ( ch - > flags & XPC_C_DISCONNECTING ) ) {
/* let registerer know that connection has been established */
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spin_lock_irqsave ( & ch - > lock , irq_flags ) ;
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if ( ! ( ch - > flags & XPC_C_CONNECTEDCALLOUT ) ) {
ch - > flags | = XPC_C_CONNECTEDCALLOUT ;
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spin_unlock_irqrestore ( & ch - > lock , irq_flags ) ;
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xpc_connected_callout ( ch ) ;
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spin_lock_irqsave ( & ch - > lock , irq_flags ) ;
ch - > flags | = XPC_C_CONNECTEDCALLOUT_MADE ;
spin_unlock_irqrestore ( & ch - > lock , irq_flags ) ;
2005-03-23 19:50:00 -07:00
/*
* It is possible that while the callout was being
* made that the remote partition sent some messages .
* If that is the case , we may need to activate
* additional kthreads to help deliver them . We only
* need one less than total # of messages to deliver .
*/
2008-07-29 22:34:19 -07:00
n_needed = xpc_n_of_deliverable_payloads ( ch ) - 1 ;
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if ( n_needed > 0 & & ! ( ch - > flags & XPC_C_DISCONNECTING ) )
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xpc_activate_kthreads ( ch , n_needed ) ;
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2005-10-25 14:07:43 -05:00
} else {
spin_unlock_irqrestore ( & ch - > lock , irq_flags ) ;
2005-03-23 19:50:00 -07:00
}
xpc_kthread_waitmsgs ( part , ch ) ;
}
2006-11-22 08:25:00 -06:00
/* let registerer know that connection is disconnecting */
2005-10-25 14:07:43 -05:00
2006-11-22 08:25:00 -06:00
spin_lock_irqsave ( & ch - > lock , irq_flags ) ;
if ( ( ch - > flags & XPC_C_CONNECTEDCALLOUT_MADE ) & &
2008-04-22 14:48:55 -05:00
! ( ch - > flags & XPC_C_DISCONNECTINGCALLOUT ) ) {
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ch - > flags | = XPC_C_DISCONNECTINGCALLOUT ;
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spin_unlock_irqrestore ( & ch - > lock , irq_flags ) ;
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2008-05-12 14:02:02 -07:00
xpc_disconnect_callout ( ch , xpDisconnecting ) ;
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spin_lock_irqsave ( & ch - > lock , irq_flags ) ;
ch - > flags | = XPC_C_DISCONNECTINGCALLOUT_MADE ;
}
spin_unlock_irqrestore ( & ch - > lock , irq_flags ) ;
2008-07-29 22:34:09 -07:00
if ( atomic_dec_return ( & ch - > kthreads_assigned ) = = 0 & &
atomic_dec_return ( & part - > nchannels_engaged ) = = 0 ) {
xpc_indicate_partition_disengaged ( part ) ;
2005-03-23 19:50:00 -07:00
}
xpc_msgqueue_deref ( ch ) ;
dev_dbg ( xpc_chan , " kthread exiting, partid=%d, channel=%d \n " ,
partid , ch_number ) ;
xpc_part_deref ( part ) ;
return 0 ;
}
/*
* For each partition that XPC has established communications with , there is
* a minimum of one kernel thread assigned to perform any operation that
* may potentially sleep or block ( basically the callouts to the asynchronous
* functions registered via xpc_connect ( ) ) .
*
* Additional kthreads are created and destroyed by XPC as the workload
* demands .
*
* A kthread is assigned to one of the active channels that exists for a given
* partition .
*/
void
2006-11-22 08:25:00 -06:00
xpc_create_kthreads ( struct xpc_channel * ch , int needed ,
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int ignore_disconnecting )
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{
unsigned long irq_flags ;
u64 args = XPC_PACK_ARGS ( ch - > partid , ch - > number ) ;
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struct xpc_partition * part = & xpc_partitions [ ch - > partid ] ;
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struct task_struct * kthread ;
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while ( needed - - > 0 ) {
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/*
* The following is done on behalf of the newly created
* kthread . That kthread is responsible for doing the
* counterpart to the following before it exits .
*/
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if ( ignore_disconnecting ) {
if ( ! atomic_inc_not_zero ( & ch - > kthreads_assigned ) ) {
/* kthreads assigned had gone to zero */
BUG_ON ( ! ( ch - > flags &
2008-04-22 14:48:55 -05:00
XPC_C_DISCONNECTINGCALLOUT_MADE ) ) ;
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break ;
}
} else if ( ch - > flags & XPC_C_DISCONNECTING ) {
break ;
2008-07-29 22:34:09 -07:00
} else if ( atomic_inc_return ( & ch - > kthreads_assigned ) = = 1 & &
atomic_inc_return ( & part - > nchannels_engaged ) = = 1 ) {
xpc_indicate_partition_engaged ( part ) ;
2006-11-22 08:25:00 -06:00
}
2008-04-22 14:48:55 -05:00
( void ) xpc_part_ref ( part ) ;
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xpc_msgqueue_ref ( ch ) ;
2008-04-22 14:50:17 -05:00
kthread = kthread_run ( xpc_kthread_start , ( void * ) args ,
" xpc%02dc%d " , ch - > partid , ch - > number ) ;
if ( IS_ERR ( kthread ) ) {
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/* the fork failed */
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/*
* NOTE : if ( ignore_disconnecting & &
* ! ( ch - > flags & XPC_C_DISCONNECTINGCALLOUT ) ) is true ,
* then we ' ll deadlock if all other kthreads assigned
* to this channel are blocked in the channel ' s
* registerer , because the only thing that will unblock
2008-05-12 14:02:02 -07:00
* them is the xpDisconnecting callout that this
2008-04-22 14:50:17 -05:00
* failed kthread_run ( ) would have made .
2006-11-22 08:25:00 -06:00
*/
2005-10-25 14:07:43 -05:00
if ( atomic_dec_return ( & ch - > kthreads_assigned ) = = 0 & &
atomic_dec_return ( & part - > nchannels_engaged ) = = 0 ) {
2008-07-29 22:34:09 -07:00
xpc_indicate_partition_disengaged ( part ) ;
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}
xpc_msgqueue_deref ( ch ) ;
xpc_part_deref ( part ) ;
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if ( atomic_read ( & ch - > kthreads_assigned ) <
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ch - > kthreads_idle_limit ) {
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/*
* Flag this as an error only if we have an
* insufficient # of kthreads for the channel
* to function .
*/
spin_lock_irqsave ( & ch - > lock , irq_flags ) ;
2008-05-12 14:02:02 -07:00
XPC_DISCONNECT_CHANNEL ( ch , xpLackOfResources ,
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& irq_flags ) ;
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spin_unlock_irqrestore ( & ch - > lock , irq_flags ) ;
}
break ;
}
}
}
void
xpc_disconnect_wait ( int ch_number )
{
2005-09-01 14:01:37 -05:00
unsigned long irq_flags ;
2008-05-12 14:02:03 -07:00
short partid ;
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struct xpc_partition * part ;
struct xpc_channel * ch ;
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int wakeup_channel_mgr ;
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/* now wait for all callouts to the caller's function to cease */
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for ( partid = 0 ; partid < xp_max_npartitions ; partid + + ) {
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part = & xpc_partitions [ partid ] ;
2008-04-22 14:50:17 -05:00
if ( ! xpc_part_ref ( part ) )
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continue ;
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2005-10-25 14:07:43 -05:00
ch = & part - > channels [ ch_number ] ;
2005-03-23 19:50:00 -07:00
2005-10-25 14:07:43 -05:00
if ( ! ( ch - > flags & XPC_C_WDISCONNECT ) ) {
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xpc_part_deref ( part ) ;
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continue ;
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}
2005-10-25 14:07:43 -05:00
2006-01-17 12:52:21 -05:00
wait_for_completion ( & ch - > wdisconnect_wait ) ;
2005-10-25 14:07:43 -05:00
spin_lock_irqsave ( & ch - > lock , irq_flags ) ;
DBUG_ON ( ! ( ch - > flags & XPC_C_DISCONNECTED ) ) ;
wakeup_channel_mgr = 0 ;
2008-07-29 22:34:10 -07:00
if ( ch - > delayed_chctl_flags ) {
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if ( part - > act_state ! = XPC_P_AS_DEACTIVATING ) {
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spin_lock ( & part - > chctl_lock ) ;
part - > chctl . flags [ ch - > number ] | =
ch - > delayed_chctl_flags ;
spin_unlock ( & part - > chctl_lock ) ;
2005-10-25 14:07:43 -05:00
wakeup_channel_mgr = 1 ;
}
2008-07-29 22:34:10 -07:00
ch - > delayed_chctl_flags = 0 ;
2005-03-23 19:50:00 -07:00
}
2005-10-25 14:07:43 -05:00
ch - > flags & = ~ XPC_C_WDISCONNECT ;
spin_unlock_irqrestore ( & ch - > lock , irq_flags ) ;
2008-04-22 14:50:17 -05:00
if ( wakeup_channel_mgr )
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xpc_wakeup_channel_mgr ( part ) ;
xpc_part_deref ( part ) ;
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}
}
2008-07-29 22:34:18 -07:00
static int
xpc_setup_partitions ( void )
{
short partid ;
struct xpc_partition * part ;
xpc_partitions = kzalloc ( sizeof ( struct xpc_partition ) *
xp_max_npartitions , GFP_KERNEL ) ;
if ( xpc_partitions = = NULL ) {
dev_err ( xpc_part , " can't get memory for partition structure \n " ) ;
return - ENOMEM ;
}
/*
* The first few fields of each entry of xpc_partitions [ ] need to
* be initialized now so that calls to xpc_connect ( ) and
* xpc_disconnect ( ) can be made prior to the activation of any remote
* partition . NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE
* ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY ' S CORRESPONDING
* PARTITION HAS BEEN ACTIVATED .
*/
for ( partid = 0 ; partid < xp_max_npartitions ; partid + + ) {
part = & xpc_partitions [ partid ] ;
DBUG_ON ( ( u64 ) part ! = L1_CACHE_ALIGN ( ( u64 ) part ) ) ;
part - > activate_IRQ_rcvd = 0 ;
spin_lock_init ( & part - > act_lock ) ;
part - > act_state = XPC_P_AS_INACTIVE ;
XPC_SET_REASON ( part , 0 , 0 ) ;
init_timer ( & part - > disengage_timer ) ;
part - > disengage_timer . function =
xpc_timeout_partition_disengage ;
part - > disengage_timer . data = ( unsigned long ) part ;
part - > setup_state = XPC_P_SS_UNSET ;
init_waitqueue_head ( & part - > teardown_wq ) ;
atomic_set ( & part - > references , 0 ) ;
}
return xpc_setup_partitions_sn ( ) ;
}
static void
xpc_teardown_partitions ( void )
{
2009-04-02 16:59:10 -07:00
xpc_teardown_partitions_sn ( ) ;
2008-07-29 22:34:18 -07:00
kfree ( xpc_partitions ) ;
}
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static void
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xpc_do_exit ( enum xp_retval reason )
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{
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short partid ;
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int active_part_count , printed_waiting_msg = 0 ;
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struct xpc_partition * part ;
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unsigned long printmsg_time , disengage_timeout = 0 ;
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2005-09-01 14:01:37 -05:00
/* a 'rmmod XPC' and a 'reboot' cannot both end up here together */
DBUG_ON ( xpc_exiting = = 1 ) ;
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/*
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* Let the heartbeat checker thread and the discovery thread
* ( if one is running ) know that they should exit . Also wake up
* the heartbeat checker thread in case it ' s sleeping .
2005-03-23 19:50:00 -07:00
*/
xpc_exiting = 1 ;
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wake_up_interruptible ( & xpc_activate_IRQ_wq ) ;
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/* wait for the discovery thread to exit */
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wait_for_completion ( & xpc_discovery_exited ) ;
2005-03-23 19:50:00 -07:00
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/* wait for the heartbeat checker thread to exit */
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wait_for_completion ( & xpc_hb_checker_exited ) ;
2005-03-23 19:50:00 -07:00
2005-09-01 14:01:37 -05:00
/* sleep for a 1/3 of a second or so */
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( void ) msleep_interruptible ( 300 ) ;
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/* wait for all partitions to become inactive */
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printmsg_time = jiffies + ( XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ ) ;
xpc_disengage_timedout = 0 ;
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2005-03-23 19:50:00 -07:00
do {
active_part_count = 0 ;
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for ( partid = 0 ; partid < xp_max_npartitions ; partid + + ) {
2005-03-23 19:50:00 -07:00
part = & xpc_partitions [ partid ] ;
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if ( xpc_partition_disengaged ( part ) & &
2008-07-29 22:34:18 -07:00
part - > act_state = = XPC_P_AS_INACTIVE ) {
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continue ;
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}
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active_part_count + + ;
XPC_DEACTIVATE_PARTITION ( part , reason ) ;
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2008-07-29 22:34:09 -07:00
if ( part - > disengage_timeout > disengage_timeout )
disengage_timeout = part - > disengage_timeout ;
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}
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2008-07-29 22:34:09 -07:00
if ( xpc_any_partition_engaged ( ) ) {
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if ( time_is_before_jiffies ( printmsg_time ) ) {
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dev_info ( xpc_part , " waiting for remote "
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" partitions to deactivate, timeout in "
" %ld seconds \n " , ( disengage_timeout -
jiffies ) / HZ ) ;
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printmsg_time = jiffies +
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( XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ ) ;
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printed_waiting_msg = 1 ;
}
} else if ( active_part_count > 0 ) {
if ( printed_waiting_msg ) {
dev_info ( xpc_part , " waiting for local partition "
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" to deactivate \n " ) ;
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printed_waiting_msg = 0 ;
}
} else {
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if ( ! xpc_disengage_timedout ) {
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dev_info ( xpc_part , " all partitions have "
2008-07-29 22:34:09 -07:00
" deactivated \n " ) ;
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}
break ;
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}
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/* sleep for a 1/3 of a second or so */
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( void ) msleep_interruptible ( 300 ) ;
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} while ( 1 ) ;
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DBUG_ON ( xpc_any_partition_engaged ( ) ) ;
2008-07-29 22:34:07 -07:00
DBUG_ON ( xpc_any_hbs_allowed ( ) ! = 0 ) ;
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2008-07-29 22:34:18 -07:00
xpc_teardown_rsvd_page ( ) ;
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2008-05-12 14:02:02 -07:00
if ( reason = = xpUnloading ) {
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( void ) unregister_die_notifier ( & xpc_die_notifier ) ;
2008-07-29 22:34:04 -07:00
( void ) unregister_reboot_notifier ( & xpc_reboot_notifier ) ;
2006-01-10 11:07:19 -06:00
}
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2005-03-23 19:50:00 -07:00
/* clear the interface to XPC's functions */
xpc_clear_interface ( ) ;
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if ( xpc_sysctl )
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unregister_sysctl_table ( xpc_sysctl ) ;
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2008-07-29 22:34:18 -07:00
xpc_teardown_partitions ( ) ;
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if ( is_shub ( ) )
xpc_exit_sn2 ( ) ;
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else if ( is_uv ( ) )
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xpc_exit_uv ( ) ;
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}
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/*
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* This function is called when the system is being rebooted .
*/
static int
xpc_system_reboot ( struct notifier_block * nb , unsigned long event , void * unused )
{
2008-05-12 14:02:02 -07:00
enum xp_retval reason ;
2006-01-10 11:08:55 -06:00
switch ( event ) {
case SYS_RESTART :
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reason = xpSystemReboot ;
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break ;
case SYS_HALT :
2008-05-12 14:02:02 -07:00
reason = xpSystemHalt ;
2006-01-10 11:08:55 -06:00
break ;
case SYS_POWER_OFF :
2008-05-12 14:02:02 -07:00
reason = xpSystemPoweroff ;
2006-01-10 11:08:55 -06:00
break ;
default :
2008-05-12 14:02:02 -07:00
reason = xpSystemGoingDown ;
2006-01-10 11:08:55 -06:00
}
xpc_do_exit ( reason ) ;
return NOTIFY_DONE ;
}
/*
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* Notify other partitions to deactivate from us by first disengaging from all
* references to our memory .
2005-11-09 14:41:57 -06:00
*/
static void
2008-07-29 22:34:09 -07:00
xpc_die_deactivate ( void )
2005-11-09 14:41:57 -06:00
{
struct xpc_partition * part ;
2008-05-12 14:02:03 -07:00
short partid ;
2008-07-29 22:34:09 -07:00
int any_engaged ;
2008-07-29 22:34:16 -07:00
long keep_waiting ;
long wait_to_print ;
2005-11-09 14:41:57 -06:00
/* keep xpc_hb_checker thread from doing anything (just in case) */
xpc_exiting = 1 ;
2008-07-29 22:34:07 -07:00
xpc_disallow_all_hbs ( ) ; /*indicate we're deactivated */
2005-11-09 14:41:57 -06:00
2008-07-29 22:34:04 -07:00
for ( partid = 0 ; partid < xp_max_npartitions ; partid + + ) {
2005-11-09 14:41:57 -06:00
part = & xpc_partitions [ partid ] ;
2008-07-29 22:34:09 -07:00
if ( xpc_partition_engaged ( partid ) | |
2008-07-29 22:34:18 -07:00
part - > act_state ! = XPC_P_AS_INACTIVE ) {
2008-07-29 22:34:09 -07:00
xpc_request_partition_deactivation ( part ) ;
xpc_indicate_partition_disengaged ( part ) ;
2005-11-09 14:41:57 -06:00
}
}
2008-07-29 22:34:09 -07:00
/*
* Though we requested that all other partitions deactivate from us ,
2008-07-29 22:34:16 -07:00
* we only wait until they ' ve all disengaged or we ' ve reached the
* defined timelimit .
*
* Given that one iteration through the following while - loop takes
* approximately 200 microseconds , calculate the # of loops to take
* before bailing and the # of loops before printing a waiting message .
2008-07-29 22:34:09 -07:00
*/
2008-07-29 22:34:16 -07:00
keep_waiting = xpc_disengage_timelimit * 1000 * 5 ;
wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5 ;
2005-11-09 14:41:57 -06:00
2006-01-06 09:48:21 -06:00
while ( 1 ) {
2008-07-29 22:34:09 -07:00
any_engaged = xpc_any_partition_engaged ( ) ;
if ( ! any_engaged ) {
dev_info ( xpc_part , " all partitions have deactivated \n " ) ;
2006-01-06 09:48:21 -06:00
break ;
}
2005-11-09 14:41:57 -06:00
2008-07-29 22:34:16 -07:00
if ( ! keep_waiting - - ) {
2008-07-29 22:34:04 -07:00
for ( partid = 0 ; partid < xp_max_npartitions ;
partid + + ) {
2008-07-29 22:34:09 -07:00
if ( xpc_partition_engaged ( partid ) ) {
dev_info ( xpc_part , " deactivate from "
2008-04-22 14:48:55 -05:00
" remote partition %d timed "
" out \n " , partid ) ;
2006-01-06 09:48:21 -06:00
}
}
break ;
}
2008-07-29 22:34:16 -07:00
if ( ! wait_to_print - - ) {
2005-11-09 14:41:57 -06:00
dev_info ( xpc_part , " waiting for remote partitions to "
2008-07-29 22:34:09 -07:00
" deactivate, timeout in %ld seconds \n " ,
2008-07-29 22:34:16 -07:00
keep_waiting / ( 1000 * 5 ) ) ;
wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL *
1000 * 5 ;
2005-11-09 14:41:57 -06:00
}
2008-07-29 22:34:16 -07:00
udelay ( 200 ) ;
2005-11-09 14:41:57 -06:00
}
}
/*
2006-01-10 11:08:00 -06:00
* This function is called when the system is being restarted or halted due
* to some sort of system failure . If this is the case we need to notify the
* other partitions to disengage from all references to our memory .
* This function can also be called when our heartbeater could be offlined
* for a time . In this case we need to notify other partitions to not worry
* about the lack of a heartbeat .
2005-11-09 14:41:57 -06:00
*/
static int
xpc_system_die ( struct notifier_block * nb , unsigned long event , void * unused )
{
2008-07-29 22:34:16 -07:00
# ifdef CONFIG_IA64 /* !!! temporary kludge */
2005-11-09 14:41:57 -06:00
switch ( event ) {
case DIE_MACHINE_RESTART :
case DIE_MACHINE_HALT :
2008-07-29 22:34:09 -07:00
xpc_die_deactivate ( ) ;
2005-11-09 14:41:57 -06:00
break ;
2006-01-10 11:08:00 -06:00
case DIE_KDEBUG_ENTER :
/* Should lack of heartbeat be ignored by other partitions? */
2008-04-22 14:50:17 -05:00
if ( ! xpc_kdebug_ignore )
2006-01-10 11:08:00 -06:00
break ;
2008-04-22 14:50:17 -05:00
2006-01-10 11:08:00 -06:00
/* fall through */
2005-11-09 14:41:57 -06:00
case DIE_MCA_MONARCH_ENTER :
case DIE_INIT_MONARCH_ENTER :
2008-07-29 22:34:07 -07:00
xpc_offline_heartbeat ( ) ;
2005-11-09 14:41:57 -06:00
break ;
2006-01-10 11:08:00 -06:00
case DIE_KDEBUG_LEAVE :
/* Is lack of heartbeat being ignored by other partitions? */
2008-04-22 14:50:17 -05:00
if ( ! xpc_kdebug_ignore )
2006-01-10 11:08:00 -06:00
break ;
2008-04-22 14:50:17 -05:00
2006-01-10 11:08:00 -06:00
/* fall through */
2005-11-09 14:41:57 -06:00
case DIE_MCA_MONARCH_LEAVE :
case DIE_INIT_MONARCH_LEAVE :
2008-07-29 22:34:07 -07:00
xpc_online_heartbeat ( ) ;
2005-11-09 14:41:57 -06:00
break ;
}
2008-07-29 22:34:16 -07:00
# else
xpc_die_deactivate ( ) ;
# endif
2005-11-09 14:41:57 -06:00
return NOTIFY_DONE ;
}
2005-03-23 19:50:00 -07:00
int __init
xpc_init ( void )
{
int ret ;
2008-04-22 14:50:17 -05:00
struct task_struct * kthread ;
2008-07-29 22:34:13 -07:00
2009-01-06 10:44:37 -08:00
dev_set_name ( xpc_part , " part " ) ;
dev_set_name ( xpc_chan , " chan " ) ;
2005-03-23 19:50:00 -07:00
2008-07-29 22:34:05 -07:00
if ( is_shub ( ) ) {
/*
* The ia64 - sn2 architecture supports at most 64 partitions .
2008-07-29 22:34:11 -07:00
* And the inability to unregister remote amos restricts us
2008-07-29 22:34:05 -07:00
* further to only support exactly 64 partitions on this
* architecture , no less .
*/
2008-07-29 22:34:18 -07:00
if ( xp_max_npartitions ! = 64 ) {
dev_err ( xpc_part , " max #of partitions not set to 64 \n " ) ;
ret = - EINVAL ;
} else {
ret = xpc_init_sn2 ( ) ;
}
2008-07-29 22:34:05 -07:00
} else if ( is_uv ( ) ) {
2008-07-29 22:34:18 -07:00
ret = xpc_init_uv ( ) ;
2008-07-29 22:34:05 -07:00
} else {
2008-07-29 22:34:18 -07:00
ret = - ENODEV ;
2008-07-29 22:34:05 -07:00
}
2005-09-08 10:46:58 -05:00
2008-07-29 22:34:18 -07:00
if ( ret ! = 0 )
return ret ;
ret = xpc_setup_partitions ( ) ;
if ( ret ! = 0 ) {
2008-07-29 22:34:04 -07:00
dev_err ( xpc_part , " can't get memory for partition structure \n " ) ;
2008-07-29 22:34:13 -07:00
goto out_1 ;
2008-07-29 22:34:04 -07:00
}
2005-03-23 19:50:00 -07:00
2008-07-29 22:34:04 -07:00
xpc_sysctl = register_sysctl_table ( xpc_sys_dir ) ;
2005-03-23 19:50:00 -07:00
/*
* Fill the partition reserved page with the information needed by
* other partitions to discover we are alive and establish initial
* communications .
*/
2008-07-29 22:34:18 -07:00
ret = xpc_setup_rsvd_page ( ) ;
if ( ret ! = 0 ) {
2008-07-29 22:34:04 -07:00
dev_err ( xpc_part , " can't setup our reserved page \n " ) ;
2008-07-29 22:34:13 -07:00
goto out_2 ;
2005-03-23 19:50:00 -07:00
}
2005-09-01 14:01:37 -05:00
/* add ourselves to the reboot_notifier_list */
ret = register_reboot_notifier ( & xpc_reboot_notifier ) ;
2008-04-22 14:50:17 -05:00
if ( ret ! = 0 )
2005-09-01 14:01:37 -05:00
dev_warn ( xpc_part , " can't register reboot notifier \n " ) ;
2007-05-08 00:27:03 -07:00
/* add ourselves to the die_notifier list */
2005-11-09 14:41:57 -06:00
ret = register_die_notifier ( & xpc_die_notifier ) ;
2008-04-22 14:50:17 -05:00
if ( ret ! = 0 )
2005-11-09 14:41:57 -06:00
dev_warn ( xpc_part , " can't register die notifier \n " ) ;
2005-03-23 19:50:00 -07:00
/*
* The real work - horse behind xpc . This processes incoming
* interrupts and monitors remote heartbeats .
*/
2008-04-22 14:50:17 -05:00
kthread = kthread_run ( xpc_hb_checker , NULL , XPC_HB_CHECK_THREAD_NAME ) ;
if ( IS_ERR ( kthread ) ) {
2005-03-23 19:50:00 -07:00
dev_err ( xpc_part , " failed while forking hb check thread \n " ) ;
2008-07-29 22:34:04 -07:00
ret = - EBUSY ;
2008-07-29 22:34:13 -07:00
goto out_3 ;
2005-03-23 19:50:00 -07:00
}
/*
* Startup a thread that will attempt to discover other partitions to
* activate based on info provided by SAL . This new thread is short
* lived and will exit once discovery is complete .
*/
2008-04-22 14:50:17 -05:00
kthread = kthread_run ( xpc_initiate_discovery , NULL ,
XPC_DISCOVERY_THREAD_NAME ) ;
if ( IS_ERR ( kthread ) ) {
2005-03-23 19:50:00 -07:00
dev_err ( xpc_part , " failed while forking discovery thread \n " ) ;
/* mark this new thread as a non-starter */
2006-01-17 12:52:21 -05:00
complete ( & xpc_discovery_exited ) ;
2005-03-23 19:50:00 -07:00
2008-05-12 14:02:02 -07:00
xpc_do_exit ( xpUnloading ) ;
2005-03-23 19:50:00 -07:00
return - EBUSY ;
}
/* set the interface to point at XPC's functions */
xpc_set_interface ( xpc_initiate_connect , xpc_initiate_disconnect ,
2008-07-29 22:34:08 -07:00
xpc_initiate_send , xpc_initiate_send_notify ,
xpc_initiate_received , xpc_initiate_partid_to_nasids ) ;
2005-03-23 19:50:00 -07:00
return 0 ;
2008-07-29 22:34:04 -07:00
/* initialization was not successful */
2008-07-29 22:34:13 -07:00
out_3 :
2008-07-29 22:34:18 -07:00
xpc_teardown_rsvd_page ( ) ;
2008-07-29 22:34:05 -07:00
2008-07-29 22:34:04 -07:00
( void ) unregister_die_notifier ( & xpc_die_notifier ) ;
( void ) unregister_reboot_notifier ( & xpc_reboot_notifier ) ;
2008-07-29 22:34:13 -07:00
out_2 :
2008-07-29 22:34:04 -07:00
if ( xpc_sysctl )
unregister_sysctl_table ( xpc_sysctl ) ;
2008-07-29 22:34:18 -07:00
xpc_teardown_partitions ( ) ;
2008-07-29 22:34:09 -07:00
out_1 :
if ( is_shub ( ) )
xpc_exit_sn2 ( ) ;
2008-10-29 14:01:12 -07:00
else if ( is_uv ( ) )
2008-07-29 22:34:09 -07:00
xpc_exit_uv ( ) ;
2008-07-29 22:34:04 -07:00
return ret ;
2005-03-23 19:50:00 -07:00
}
2008-04-22 14:48:55 -05:00
module_init ( xpc_init ) ;
2005-03-23 19:50:00 -07:00
void __exit
xpc_exit ( void )
{
2008-05-12 14:02:02 -07:00
xpc_do_exit ( xpUnloading ) ;
2005-03-23 19:50:00 -07:00
}
2008-04-22 14:48:55 -05:00
module_exit ( xpc_exit ) ;
2005-03-23 19:50:00 -07:00
MODULE_AUTHOR ( " Silicon Graphics, Inc. " ) ;
MODULE_DESCRIPTION ( " Cross Partition Communication (XPC) support " ) ;
MODULE_LICENSE ( " GPL " ) ;
module_param ( xpc_hb_interval , int , 0 ) ;
MODULE_PARM_DESC ( xpc_hb_interval , " Number of seconds between "
2008-04-22 14:48:55 -05:00
" heartbeat increments. " ) ;
2005-03-23 19:50:00 -07:00
module_param ( xpc_hb_check_interval , int , 0 ) ;
MODULE_PARM_DESC ( xpc_hb_check_interval , " Number of seconds between "
2008-04-22 14:48:55 -05:00
" heartbeat checks. " ) ;
2005-03-23 19:50:00 -07:00
2008-07-29 22:34:09 -07:00
module_param ( xpc_disengage_timelimit , int , 0 ) ;
MODULE_PARM_DESC ( xpc_disengage_timelimit , " Number of seconds to wait "
" for disengage to complete. " ) ;
2005-10-25 14:07:43 -05:00
2006-01-10 11:08:00 -06:00
module_param ( xpc_kdebug_ignore , int , 0 ) ;
MODULE_PARM_DESC ( xpc_kdebug_ignore , " Should lack of heartbeat be ignored by "
2008-04-22 14:48:55 -05:00
" other partitions when dropping into kdebug. " ) ;