ia64/xen: preliminary support for save/restore.
Isaku Yamahata [Fri, 17 Oct 2008 02:18:10 +0000 (11:18 +0900)]
preliminary support for save/restore.
Although Save/restore isn't fully working yet, this patch is necessary
to compile.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/xen/Makefile
arch/ia64/xen/suspend.c [new file with mode: 0644]
arch/ia64/xen/time.c
arch/ia64/xen/time.h

index 972d085..0ad0224 100644 (file)
@@ -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 time.o
+        hypervisor.o xencomm.o xcom_hcall.o grant-table.o time.o suspend.o
 
 obj-$(CONFIG_IA64_GENERIC) += machvec.o
 
diff --git a/arch/ia64/xen/suspend.c b/arch/ia64/xen/suspend.c
new file mode 100644 (file)
index 0000000..fd66b04
--- /dev/null
@@ -0,0 +1,64 @@
+/******************************************************************************
+ * arch/ia64/xen/suspend.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
+ *
+ * suspend/resume
+ */
+
+#include <xen/xen-ops.h>
+#include <asm/xen/hypervisor.h>
+#include "time.h"
+
+void
+xen_mm_pin_all(void)
+{
+       /* nothing */
+}
+
+void
+xen_mm_unpin_all(void)
+{
+       /* nothing */
+}
+
+void xen_pre_device_suspend(void)
+{
+       /* nothing */
+}
+
+void
+xen_pre_suspend()
+{
+       /* nothing */
+}
+
+void
+xen_post_suspend(int suspend_cancelled)
+{
+       if (suspend_cancelled)
+               return;
+
+       xen_ia64_enable_opt_feature();
+       /* add more if necessary */
+}
+
+void xen_arch_resume(void)
+{
+       xen_timer_resume_on_aps();
+}
index ec168ec..d15a94c 100644 (file)
@@ -26,6 +26,8 @@
 #include <linux/irq.h>
 #include <linux/clocksource.h>
 
+#include <asm/timex.h>
+
 #include <asm/xen/hypervisor.h>
 
 #include <xen/interface/vcpu.h>
@@ -178,3 +180,34 @@ struct pv_time_ops xen_time_ops __initdata = {
        .do_steal_accounting            = xen_do_steal_accounting,
        .clocksource_resume             = xen_itc_jitter_data_reset,
 };
+
+/* 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);
+}
index b9c7ec5..f98d7e1 100644 (file)
@@ -21,3 +21,4 @@
  */
 
 extern struct pv_time_ops xen_time_ops __initdata;
+void xen_timer_resume_on_aps(void);