Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 257 insertions, 0 deletions

diff --git a/arch/ia64/xen/time.c b/arch/ia64/xen/time.c
new file mode 100644
index 00000000..1f8244a7
--- /dev/null
+++ b/arch/ia64/xen/time.c
@@ -0,0 +1,257 @@
+/******************************************************************************
+ * arch/ia64/xen/time.c
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/kernel_stat.h>
+#include <linux/posix-timers.h>
+#include <linux/irq.h>
+#include <linux/clocksource.h>
+
+#include <asm/timex.h>
+
+#include <asm/xen/hypervisor.h>
+
+#include <xen/interface/vcpu.h>
+
+#include "../kernel/fsyscall_gtod_data.h"
+
+static DEFINE_PER_CPU(struct vcpu_runstate_info, xen_runstate);
+static DEFINE_PER_CPU(unsigned long, xen_stolen_time);
+static DEFINE_PER_CPU(unsigned long, xen_blocked_time);
+
+/* taken from i386/kernel/time-xen.c */
+static void xen_init_missing_ticks_accounting(int cpu)
+{
+	struct vcpu_register_runstate_memory_area area;
+	struct vcpu_runstate_info *runstate = &per_cpu(xen_runstate, cpu);
+	int rc;
+
+	memset(runstate, 0, sizeof(*runstate));
+
+	area.addr.v = runstate;
+	rc = HYPERVISOR_vcpu_op(VCPUOP_register_runstate_memory_area, cpu,
+				&area);
+	WARN_ON(rc && rc != -ENOSYS);
+
+	per_cpu(xen_blocked_time, cpu) = runstate->time[RUNSTATE_blocked];
+	per_cpu(xen_stolen_time, cpu) = runstate->time[RUNSTATE_runnable]
+					    + runstate->time[RUNSTATE_offline];
+}
+
+/*
+ * Runstate accounting
+ */
+/* stolen from arch/x86/xen/time.c */
+static void get_runstate_snapshot(struct vcpu_runstate_info *res)
+{
+	u64 state_time;
+	struct vcpu_runstate_info *state;
+
+	BUG_ON(preemptible());
+
+	state = &__get_cpu_var(xen_runstate);
+
+	/*
+	 * The runstate info is always updated by the hypervisor on
+	 * the current CPU, so there's no need to use anything
+	 * stronger than a compiler barrier when fetching it.
+	 */
+	do {
+		state_time = state->state_entry_time;
+		rmb();
+		*res = *state;
+		rmb();
+	} while (state->state_entry_time != state_time);
+}
+
+#define NS_PER_TICK (1000000000LL/HZ)
+
+static unsigned long
+consider_steal_time(unsigned long new_itm)
+{
+	unsigned long stolen, blocked;
+	unsigned long delta_itm = 0, stolentick = 0;
+	int cpu = smp_processor_id();
+	struct vcpu_runstate_info runstate;
+	struct task_struct *p = current;
+
+	get_runstate_snapshot(&runstate);
+
+	/*
+	 * Check for vcpu migration effect
+	 * In this case, itc value is reversed.
+	 * This causes huge stolen value.
+	 * This function just checks and reject this effect.
+	 */
+	if (!time_after_eq(runstate.time[RUNSTATE_blocked],
+			   per_cpu(xen_blocked_time, cpu)))
+		blocked = 0;
+
+	if (!time_after_eq(runstate.time[RUNSTATE_runnable] +
+			   runstate.time[RUNSTATE_offline],
+			   per_cpu(xen_stolen_time, cpu)))
+		stolen = 0;
+
+	if (!time_after(delta_itm + new_itm, ia64_get_itc()))
+		stolentick = ia64_get_itc() - new_itm;
+
+	do_div(stolentick, NS_PER_TICK);
+	stolentick++;
+
+	do_div(stolen, NS_PER_TICK);
+
+	if (stolen > stolentick)
+		stolen = stolentick;
+
+	stolentick -= stolen;
+	do_div(blocked, NS_PER_TICK);
+
+	if (blocked > stolentick)
+		blocked = stolentick;
+
+	if (stolen > 0 || blocked > 0) {
+		account_steal_ticks(stolen);
+		account_idle_ticks(blocked);
+		run_local_timers();
+
+		rcu_check_callbacks(cpu, user_mode(get_irq_regs()));
+
+		scheduler_tick();
+		run_posix_cpu_timers(p);
+		delta_itm += local_cpu_data->itm_delta * (stolen + blocked);
+
+		if (cpu == time_keeper_id)
+			xtime_update(stolen + blocked);
+
+		local_cpu_data->itm_next = delta_itm + new_itm;
+
+		per_cpu(xen_stolen_time, cpu) += NS_PER_TICK * stolen;
+		per_cpu(xen_blocked_time, cpu) += NS_PER_TICK * blocked;
+	}
+	return delta_itm;
+}
+
+static int xen_do_steal_accounting(unsigned long *new_itm)
+{
+	unsigned long delta_itm;
+	delta_itm = consider_steal_time(*new_itm);
+	*new_itm += delta_itm;
+	if (time_after(*new_itm, ia64_get_itc()) && delta_itm)
+		return 1;
+
+	return 0;
+}
+
+static void xen_itc_jitter_data_reset(void)
+{
+	u64 lcycle, ret;
+
+	do {
+		lcycle = itc_jitter_data.itc_lastcycle;
+		ret = cmpxchg(&itc_jitter_data.itc_lastcycle, lcycle, 0);
+	} while (unlikely(ret != lcycle));
+}
+
+/* based on xen_sched_clock() in arch/x86/xen/time.c. */
+/*
+ * This relies on HAVE_UNSTABLE_SCHED_CLOCK. If it can't be defined,
+ * something similar logic should be implemented here.
+ */
+/*
+ * Xen sched_clock implementation.  Returns the number of unstolen
+ * nanoseconds, which is nanoseconds the VCPU spent in RUNNING+BLOCKED
+ * states.
+ */
+static unsigned long long xen_sched_clock(void)
+{
+	struct vcpu_runstate_info runstate;
+
+	unsigned long long now;
+	unsigned long long offset;
+	unsigned long long ret;
+
+	/*
+	 * Ideally sched_clock should be called on a per-cpu basis
+	 * anyway, so preempt should already be disabled, but that's
+	 * not current practice at the moment.
+	 */
+	preempt_disable();
+
+	/*
+	 * both ia64_native_sched_clock() and xen's runstate are
+	 * based on mAR.ITC. So difference of them makes sense.
+	 */
+	now = ia64_native_sched_clock();
+
+	get_runstate_snapshot(&runstate);
+
+	WARN_ON(runstate.state != RUNSTATE_running);
+
+	offset = 0;
+	if (now > runstate.state_entry_time)
+		offset = now - runstate.state_entry_time;
+	ret = runstate.time[RUNSTATE_blocked] +
+		runstate.time[RUNSTATE_running] +
+		offset;
+
+	preempt_enable();
+
+	return ret;
+}
+
+struct pv_time_ops xen_time_ops __initdata = {
+	.init_missing_ticks_accounting	= xen_init_missing_ticks_accounting,
+	.do_steal_accounting		= xen_do_steal_accounting,
+	.clocksource_resume		= xen_itc_jitter_data_reset,
+	.sched_clock			= xen_sched_clock,
+};
+
+/* Called after suspend, to resume time.  */
+static void xen_local_tick_resume(void)
+{
+	/* Just trigger a tick.  */
+	ia64_cpu_local_tick();
+	touch_softlockup_watchdog();
+}
+
+void
+xen_timer_resume(void)
+{
+	unsigned int cpu;
+
+	xen_local_tick_resume();
+
+	for_each_online_cpu(cpu)
+		xen_init_missing_ticks_accounting(cpu);
+}
+
+static void ia64_cpu_local_tick_fn(void *unused)
+{
+	xen_local_tick_resume();
+	xen_init_missing_ticks_accounting(smp_processor_id());
+}
+
+void
+xen_timer_resume_on_aps(void)
+{
+	smp_call_function(&ia64_cpu_local_tick_fn, NULL, 1);
+}