CPUIDLE: Port Linux menu governor to replace the initial ladder governor

The ladder governor has long pro/demotion delay shortcome while
applying to tickless mode, because it needs to count usage. Menu
governor chooses the next state simply via break-event prediction
including the factors of next timer event & last residency time etc,
so it would have faster response speed.

Signed-off-by: Gang Wei <gang.wei@intel.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/xen/include/xen/cpuidle.h b/xen/include/xen/cpuidle.h
new file mode 100644
index 0000000000..32d71d15f3
--- /dev/null
+++ b/xen/include/xen/cpuidle.h
@@ -0,0 +1,82 @@
+/*
+ * cpuidle.h - xen idle state module derived from Linux 
+ *
+ * (C) 2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ *          Shaohua Li <shaohua.li@intel.com>
+ *          Adam Belay <abelay@novell.com>
+ *  Copyright (C) 2008 Intel Corporation
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#ifndef _XEN_CPUIDLE_H
+#define _XEN_CPUIDLE_H
+
+#define ACPI_PROCESSOR_MAX_POWER        8
+#define CPUIDLE_NAME_LEN                16
+
+struct acpi_processor_cx
+{
+    u8 valid;
+    u8 type;
+    u32 address;
+    u8 space_id;
+    u32 latency;
+    u32 latency_ticks;
+    u32 power;
+    u32 usage;
+    u64 time;
+    u32 target_residency;
+};
+
+struct acpi_processor_flags
+{
+    u8 bm_control:1;
+    u8 bm_check:1;
+    u8 has_cst:1;
+    u8 power_setup_done:1;
+    u8 bm_rld_set:1;
+};
+
+struct acpi_processor_power
+{
+    unsigned int cpu;
+    struct acpi_processor_flags flags;
+    struct acpi_processor_cx *last_state;
+    struct acpi_processor_cx *safe_state;
+    u32 last_residency;
+    void *gdata; /* governor specific data */
+    u32 count;
+    struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
+};
+
+struct cpuidle_governor
+{
+    char                    name[CPUIDLE_NAME_LEN];
+    unsigned int            rating;
+
+    int  (*enable)          (struct acpi_processor_power *dev);
+    void (*disable)         (struct acpi_processor_power *dev);
+
+    int  (*select)          (struct acpi_processor_power *dev);
+    void (*reflect)         (struct acpi_processor_power *dev);
+};
+
+extern struct cpuidle_governor *cpuidle_current_governor;
+
+#endif /* _XEN_CPUIDLE_H */