implement xen pv_time_ops to account steal time.

Cc: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
Signed-off-by: Alex Williamson <[EMAIL PROTECTED]>
Signed-off-by: Isaku Yamahata <[EMAIL PROTECTED]>
---
 arch/ia64/xen/Makefile     |    2 +-
 arch/ia64/xen/time.c       |  180 ++++++++++++++++++++++++++++++++++++++++++++
 arch/ia64/xen/time.h       |   23 ++++++
 arch/ia64/xen/xen_pv_ops.c |    2 +
 4 files changed, 206 insertions(+), 1 deletions(-)
 create mode 100644 arch/ia64/xen/time.c
 create mode 100644 arch/ia64/xen/time.h

diff --git a/arch/ia64/xen/Makefile b/arch/ia64/xen/Makefile
index 01c4289..ed31c76 100644
--- a/arch/ia64/xen/Makefile
+++ b/arch/ia64/xen/Makefile
@@ -3,7 +3,7 @@
 #
 
 obj-y := hypercall.o xenivt.o xensetup.o xen_pv_ops.o irq_xen.o \
-        hypervisor.o xencomm.o xcom_hcall.o grant-table.o
+        hypervisor.o xencomm.o xcom_hcall.o grant-table.o time.o
 
 AFLAGS_xenivt.o += -D__IA64_ASM_PARAVIRTUALIZED_XEN
 
diff --git a/arch/ia64/xen/time.c b/arch/ia64/xen/time.c
new file mode 100644
index 0000000..ec168ec
--- /dev/null
+++ b/arch/ia64/xen/time.c
@@ -0,0 +1,180 @@
+/******************************************************************************
+ * 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/xen/hypervisor.h>
+
+#include <xen/interface/vcpu.h>
+
+#include "../kernel/fsyscall_gtod_data.h"
+
+DEFINE_PER_CPU(struct vcpu_runstate_info, runstate);
+DEFINE_PER_CPU(unsigned long, processed_stolen_time);
+DEFINE_PER_CPU(unsigned long, processed_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(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(processed_blocked_time, cpu) = runstate->time[RUNSTATE_blocked];
+       per_cpu(processed_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(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(processed_blocked_time, cpu)))
+               blocked = 0;
+
+       if (!time_after_eq(runstate.time[RUNSTATE_runnable] +
+                          runstate.time[RUNSTATE_offline],
+                          per_cpu(processed_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_time(NULL, jiffies_to_cputime(stolen));
+               account_steal_time(idle_task(cpu), jiffies_to_cputime(blocked));
+               run_local_timers();
+
+               if (rcu_pending(cpu))
+                       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) {
+                       write_seqlock(&xtime_lock);
+                       do_timer(stolen + blocked);
+                       local_cpu_data->itm_next = delta_itm + new_itm;
+                       write_sequnlock(&xtime_lock);
+               } else {
+                       local_cpu_data->itm_next = delta_itm + new_itm;
+               }
+               per_cpu(processed_stolen_time, cpu) += NS_PER_TICK * stolen;
+               per_cpu(processed_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));
+}
+
+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,
+};
diff --git a/arch/ia64/xen/time.h b/arch/ia64/xen/time.h
new file mode 100644
index 0000000..b9c7ec5
--- /dev/null
+++ b/arch/ia64/xen/time.h
@@ -0,0 +1,23 @@
+/******************************************************************************
+ * arch/ia64/xen/time.h
+ *
+ * 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
+ *
+ */
+
+extern struct pv_time_ops xen_time_ops __initdata;
diff --git a/arch/ia64/xen/xen_pv_ops.c b/arch/ia64/xen/xen_pv_ops.c
index 4fe4e62..04cd123 100644
--- a/arch/ia64/xen/xen_pv_ops.c
+++ b/arch/ia64/xen/xen_pv_ops.c
@@ -30,6 +30,7 @@
 #include <asm/xen/privop.h>
 
 #include "irq_xen.h"
+#include "time.h"
 
 /***************************************************************************
  * general info
@@ -357,6 +358,7 @@ xen_setup_pv_ops(void)
        pv_cpu_ops = xen_cpu_ops;
        pv_iosapic_ops = xen_iosapic_ops;
        pv_irq_ops = xen_irq_ops;
+       pv_time_ops = xen_time_ops;
 
        paravirt_cpu_asm_init(&xen_cpu_asm_switch);
 }
-- 
1.6.0.2


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