[Xen-changelog] [linux-2.6.18-xen] Notify CPU frequency changes to Xen.

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1190294232 -3600
# Node ID 2a8f7f0a8726a7d4f513a0bf044e65765c2be34c
# Parent  8a407c41dfb0cc03b66366b45eacd48c3e7bda4c
Notify CPU frequency changes to Xen.
Signed-off-by: Mark Langsdorf <mark.langsdorf@xxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 arch/i386/kernel/time-xen.c      |   40 +++++++++++++++++++++++++++++++++++++++
 include/xen/interface/platform.h |   11 ++++++++++
 2 files changed, 51 insertions(+)

diff -r 8a407c41dfb0 -r 2a8f7f0a8726 arch/i386/kernel/time-xen.c
--- a/arch/i386/kernel/time-xen.c       Thu Sep 20 14:16:30 2007 +0100
+++ b/arch/i386/kernel/time-xen.c       Thu Sep 20 14:17:12 2007 +0100
@@ -50,6 +50,7 @@
 #include <linux/percpu.h>
 #include <linux/kernel_stat.h>
 #include <linux/posix-timers.h>
+#include <linux/cpufreq.h>
 
 #include <asm/io.h>
 #include <asm/smp.h>
@@ -1118,6 +1119,45 @@ void local_teardown_timer(unsigned int c
        BUG_ON(cpu == 0);
        unbind_from_irqhandler(per_cpu(timer_irq, cpu), NULL);
 }
+#endif
+
+#if CONFIG_CPU_FREQ
+static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, 
+                               void *data)
+{
+       struct cpufreq_freqs *freq = data;
+       struct xen_platform_op op;
+
+       if (cpu_has(&cpu_data[freq->cpu], X86_FEATURE_CONSTANT_TSC))
+               return 0;
+
+       if (val == CPUFREQ_PRECHANGE)
+               return 0;
+
+       op.cmd = XENPF_change_freq;
+       op.u.change_freq.flags = 0;
+       op.u.change_freq.cpu = freq->cpu;
+       op.u.change_freq.freq = (u64)freq->new * 1000;
+       HYPERVISOR_platform_op(&op);
+
+       return 0;
+}
+
+static struct notifier_block time_cpufreq_notifier_block = {
+       .notifier_call = time_cpufreq_notifier
+};
+
+static int __init cpufreq_time_setup(void)
+{
+       if (!cpufreq_register_notifier(&time_cpufreq_notifier_block,
+                       CPUFREQ_TRANSITION_NOTIFIER)) {
+               printk(KERN_ERR "failed to set up cpufreq notifier\n");
+               return -ENODEV;
+       }
+       return 0;
+}
+
+core_initcall(cpufreq_time_setup);
 #endif
 
 /*
diff -r 8a407c41dfb0 -r 2a8f7f0a8726 include/xen/interface/platform.h
--- a/include/xen/interface/platform.h  Thu Sep 20 14:16:30 2007 +0100
+++ b/include/xen/interface/platform.h  Thu Sep 20 14:17:12 2007 +0100
@@ -164,6 +164,16 @@ typedef struct xenpf_enter_acpi_sleep xe
 typedef struct xenpf_enter_acpi_sleep xenpf_enter_acpi_sleep_t;
 DEFINE_XEN_GUEST_HANDLE(xenpf_enter_acpi_sleep_t);
 
+#define XENPF_change_freq       52
+struct xenpf_change_freq {
+    /* IN variables */
+    uint32_t flags; /* Must be zero. */
+    uint32_t cpu;   /* Physical cpu. */
+    uint64_t freq;  /* New frequency (Hz). */
+};
+typedef struct xenpf_change_freq xenpf_change_freq_t;
+DEFINE_XEN_GUEST_HANDLE(xenpf_change_freq_t);
+
 struct xen_platform_op {
     uint32_t cmd;
     uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -176,6 +186,7 @@ struct xen_platform_op {
         struct xenpf_platform_quirk    platform_quirk;
         struct xenpf_firmware_info     firmware_info;
         struct xenpf_enter_acpi_sleep  enter_acpi_sleep;
+        struct xenpf_change_freq       change_freq;
         uint8_t                        pad[128];
     } u;
 };

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