int kgdb_arch_init(void)
{
return register_die_notifier(&kgdb_notifier);
}
int __init
xpc_init(void)
{
int ret;
struct task_struct *kthread;
dev_set_name(xpc_part, "part");
dev_set_name(xpc_chan, "chan");
if (is_shub()) {
/*
* The ia64-sn2 architecture supports at most 64 partitions.
* And the inability to unregister remote amos restricts us
* further to only support exactly 64 partitions on this
* architecture, no less.
*/
if (xp_max_npartitions != 64) {
dev_err(xpc_part, "max #of partitions not set to 64\n");
ret = -EINVAL;
} else {
ret = xpc_init_sn2();
}
} else if (is_uv()) {
ret = xpc_init_uv();
} else {
ret = -ENODEV;
}
if (ret != 0)
return ret;
ret = xpc_setup_partitions();
if (ret != 0) {
dev_err(xpc_part, "can't get memory for partition structure\n");
goto out_1;
}
xpc_sysctl = register_sysctl_table(xpc_sys_dir);
/*
* Fill the partition reserved page with the information needed by
* other partitions to discover we are alive and establish initial
* communications.
*/
ret = xpc_setup_rsvd_page();
if (ret != 0) {
dev_err(xpc_part, "can't setup our reserved page\n");
goto out_2;
}
/* add ourselves to the reboot_notifier_list */
ret = register_reboot_notifier(&xpc_reboot_notifier);
if (ret != 0)
dev_warn(xpc_part, "can't register reboot notifier\n");
/* add ourselves to the die_notifier list */
ret = register_die_notifier(&xpc_die_notifier);
if (ret != 0)
dev_warn(xpc_part, "can't register die notifier\n");
/*
* The real work-horse behind xpc. This processes incoming
* interrupts and monitors remote heartbeats.
*/
kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME);
if (IS_ERR(kthread)) {
dev_err(xpc_part, "failed while forking hb check thread\n");
ret = -EBUSY;
goto out_3;
}
/*
* 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.
*/
kthread = kthread_run(xpc_initiate_discovery, NULL,
XPC_DISCOVERY_THREAD_NAME);
if (IS_ERR(kthread)) {
dev_err(xpc_part, "failed while forking discovery thread\n");
/* mark this new thread as a non-starter */
complete(&xpc_discovery_exited);
xpc_do_exit(xpUnloading);
return -EBUSY;
}
/* set the interface to point at XPC's functions */
xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
xpc_initiate_send, xpc_initiate_send_notify,
xpc_initiate_received, xpc_initiate_partid_to_nasids);
return 0;
/* initialization was not successful */
out_3:
xpc_teardown_rsvd_page();
(void)unregister_die_notifier(&xpc_die_notifier);
(void)unregister_reboot_notifier(&xpc_reboot_notifier);
out_2:
if (xpc_sysctl)
unregister_sysctl_table(xpc_sysctl);
xpc_teardown_partitions();
out_1:
if (is_shub())
xpc_exit_sn2();
else if (is_uv())
xpc_exit_uv();
return ret;
}
static int __init mrdump_mini_init(void)
{
register_die_notifier(&mrdump_mini_oops_blk);
return 0;
}
static int __init register_trigger_all_cpu_backtrace(void)
{
register_die_notifier(&backtrace_notifier);
return 0;
}
static int timer_start(void)
{
if (register_die_notifier(&profile_timer_exceptions_nb))
return 1;
return 0;
}
int __init
xpc_init(void)
{
int ret;
short partid;
struct xpc_partition *part;
struct task_struct *kthread;
size_t buf_size;
if (!ia64_platform_is("sn2"))
return -ENODEV;
buf_size = max(XPC_RP_VARS_SIZE,
XPC_RP_HEADER_SIZE + XP_NASID_MASK_BYTES);
xpc_remote_copy_buffer = xpc_kmalloc_cacheline_aligned(buf_size,
GFP_KERNEL,
&xpc_remote_copy_buffer_base);
if (xpc_remote_copy_buffer == NULL)
return -ENOMEM;
snprintf(xpc_part->bus_id, BUS_ID_SIZE, "part");
snprintf(xpc_chan->bus_id, BUS_ID_SIZE, "chan");
xpc_sysctl = register_sysctl_table(xpc_sys_dir);
/*
* 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 = 1; partid < XP_MAX_PARTITIONS; partid++) {
part = &xpc_partitions[partid];
DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part));
part->act_IRQ_rcvd = 0;
spin_lock_init(&part->act_lock);
part->act_state = XPC_P_INACTIVE;
XPC_SET_REASON(part, 0, 0);
init_timer(&part->disengage_request_timer);
part->disengage_request_timer.function =
xpc_timeout_partition_disengage_request;
part->disengage_request_timer.data = (unsigned long)part;
part->setup_state = XPC_P_UNSET;
init_waitqueue_head(&part->teardown_wq);
atomic_set(&part->references, 0);
}
/*
* Open up protections for IPI operations (and AMO operations on
* Shub 1.1 systems).
*/
xpc_allow_IPI_ops();
/*
* Interrupts being processed will increment this atomic variable and
* awaken the heartbeat thread which will process the interrupts.
*/
atomic_set(&xpc_act_IRQ_rcvd, 0);
/*
* This is safe to do before the xpc_hb_checker thread has started
* because the handler releases a wait queue. If an interrupt is
* received before the thread is waiting, it will not go to sleep,
* but rather immediately process the interrupt.
*/
ret = request_irq(SGI_XPC_ACTIVATE, xpc_act_IRQ_handler, 0,
"xpc hb", NULL);
if (ret != 0) {
dev_err(xpc_part, "can't register ACTIVATE IRQ handler, "
"errno=%d\n", -ret);
xpc_restrict_IPI_ops();
if (xpc_sysctl)
unregister_sysctl_table(xpc_sysctl);
kfree(xpc_remote_copy_buffer_base);
return -EBUSY;
}
/*
* Fill the partition reserved page with the information needed by
* other partitions to discover we are alive and establish initial
* communications.
*/
xpc_rsvd_page = xpc_rsvd_page_init();
if (xpc_rsvd_page == NULL) {
dev_err(xpc_part, "could not setup our reserved page\n");
free_irq(SGI_XPC_ACTIVATE, NULL);
xpc_restrict_IPI_ops();
if (xpc_sysctl)
unregister_sysctl_table(xpc_sysctl);
kfree(xpc_remote_copy_buffer_base);
return -EBUSY;
}
/* add ourselves to the reboot_notifier_list */
ret = register_reboot_notifier(&xpc_reboot_notifier);
if (ret != 0)
dev_warn(xpc_part, "can't register reboot notifier\n");
/* add ourselves to the die_notifier list */
ret = register_die_notifier(&xpc_die_notifier);
if (ret != 0)
dev_warn(xpc_part, "can't register die notifier\n");
init_timer(&xpc_hb_timer);
xpc_hb_timer.function = xpc_hb_beater;
/*
* The real work-horse behind xpc. This processes incoming
* interrupts and monitors remote heartbeats.
*/
kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME);
if (IS_ERR(kthread)) {
dev_err(xpc_part, "failed while forking hb check thread\n");
/* indicate to others that our reserved page is uninitialized */
xpc_rsvd_page->vars_pa = 0;
/* take ourselves off of the reboot_notifier_list */
(void)unregister_reboot_notifier(&xpc_reboot_notifier);
/* take ourselves off of the die_notifier list */
(void)unregister_die_notifier(&xpc_die_notifier);
del_timer_sync(&xpc_hb_timer);
free_irq(SGI_XPC_ACTIVATE, NULL);
xpc_restrict_IPI_ops();
if (xpc_sysctl)
unregister_sysctl_table(xpc_sysctl);
kfree(xpc_remote_copy_buffer_base);
return -EBUSY;
}
/*
* 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.
*/
kthread = kthread_run(xpc_initiate_discovery, NULL,
XPC_DISCOVERY_THREAD_NAME);
if (IS_ERR(kthread)) {
dev_err(xpc_part, "failed while forking discovery thread\n");
/* mark this new thread as a non-starter */
complete(&xpc_discovery_exited);
xpc_do_exit(xpUnloading);
return -EBUSY;
}
/* set the interface to point at XPC's functions */
xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
xpc_initiate_allocate, xpc_initiate_send,
xpc_initiate_send_notify, xpc_initiate_received,
xpc_initiate_partid_to_nasids);
return 0;
}