/*
* 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
* 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.
*/
static int
xpc_activating(void *__partid)
{
short partid = (u64)__partid;
struct xpc_partition *part = &xpc_partitions[partid];
unsigned long irq_flags;
DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
spin_lock_irqsave(&part->act_lock, irq_flags);
if (part->act_state == XPC_P_AS_DEACTIVATING) {
part->act_state = XPC_P_AS_INACTIVE;
spin_unlock_irqrestore(&part->act_lock, irq_flags);
part->remote_rp_pa = 0;
return 0;
}
/* indicate the thread is activating */
DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ);
part->act_state = XPC_P_AS_ACTIVATING;
XPC_SET_REASON(part, 0, 0);
spin_unlock_irqrestore(&part->act_lock, irq_flags);
dev_dbg(xpc_part, "activating partition %d\n", partid);
xpc_allow_hb(partid);
if (xpc_setup_ch_structures(part) == xpSuccess) {
(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);
xpc_teardown_ch_structures(part);
}
xpc_disallow_hb(partid);
xpc_mark_partition_inactive(part);
if (part->reason == xpReactivating) {
/* interrupting ourselves results in activating partition */
xpc_request_partition_reactivation(part);
}
return 0;
}
static int
xpc_activating(void *__partid)
{
short partid = (u64)__partid;
struct xpc_partition *part = &xpc_partitions[partid];
unsigned long irq_flags;
DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
spin_lock_irqsave(&part->act_lock, irq_flags);
if (part->act_state == XPC_P_DEACTIVATING) {
part->act_state = XPC_P_INACTIVE;
spin_unlock_irqrestore(&part->act_lock, irq_flags);
part->remote_rp_pa = 0;
return 0;
}
/* indicate the thread is activating */
DBUG_ON(part->act_state != XPC_P_ACTIVATION_REQ);
part->act_state = XPC_P_ACTIVATING;
XPC_SET_REASON(part, 0, 0);
spin_unlock_irqrestore(&part->act_lock, irq_flags);
dev_dbg(xpc_part, "bringing partition %d up\n", partid);
/*
* Register the remote partition's AMOs with SAL so it can handle
* and cleanup errors within that address range should the remote
* partition go down. We don't unregister this range because it is
* difficult to tell when outstanding writes to the remote partition
* are finished and thus when it is safe to unregister. This should
* not result in wasted space in the SAL xp_addr_region table because
* we should get the same page for remote_amos_page_pa after module
* reloads and system reboots.
*/
if (sn_register_xp_addr_region(part->remote_amos_page_pa,
PAGE_SIZE, 1) < 0) {
dev_warn(xpc_part, "xpc_partition_up(%d) failed to register "
"xp_addr region\n", partid);
spin_lock_irqsave(&part->act_lock, irq_flags);
part->act_state = XPC_P_INACTIVE;
XPC_SET_REASON(part, xpPhysAddrRegFailed, __LINE__);
spin_unlock_irqrestore(&part->act_lock, irq_flags);
part->remote_rp_pa = 0;
return 0;
}
xpc_allow_hb(partid, xpc_vars);
xpc_IPI_send_activated(part);
/*
* xpc_partition_up() holds this thread and marks this partition as
* XPC_P_ACTIVE by calling xpc_hb_mark_active().
*/
(void)xpc_partition_up(part);
xpc_disallow_hb(partid, xpc_vars);
xpc_mark_partition_inactive(part);
if (part->reason == xpReactivating) {
/* interrupting ourselves results in activating partition */
xpc_IPI_send_reactivate(part);
}
return 0;
}