[Xen-devel] [PATCH 8/8] ACPI: xen processor: set ignore_ppc to handle PPC event for Xen vcpu.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

From: Kevin Tian <kevin.tian@xxxxxxxxx>

Xen acpi processor does not CPUFREQ_START, hence we we need to set
ignore_ppc to handle PPC events.

Signed-off-by: Yu Ke <ke.yu@xxxxxxxxx>
Signed-off-by: Tian Kevin <kevin.tian@xxxxxxxxx>
Signed-off-by: Tang Liang <liang.tang@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 drivers/acpi/processor_perflib.c |    2 +-
 drivers/acpi/processor_xen.c     |    2 ++
 include/acpi/processor.h         |    1 +
 3 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 22c6195..e622a0d 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -65,7 +65,7 @@ static DEFINE_MUTEX(performance_mutex);
  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  *  1 -> ignore _PPC totally -> forced by user through boot param
  */
-static int ignore_ppc = -1;
+int ignore_ppc = -1;
 module_param(ignore_ppc, int, 0644);
 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
                 "limited by BIOS, this should help");
diff --git a/drivers/acpi/processor_xen.c b/drivers/acpi/processor_xen.c
index fc3cc0b..a87b222 100644
--- a/drivers/acpi/processor_xen.c
+++ b/drivers/acpi/processor_xen.c
@@ -217,12 +217,14 @@ int xen_acpi_processor_init(void)
        if (result < 0)
                return result;
                /* mark ready for handling ppc */
+       ignore_ppc = 0;
 
        return 0;
 }
 
 void xen_acpi_processor_exit(void)
 {
+       ignore_ppc = -1;
 
        acpi_bus_unregister_driver(&xen_acpi_processor_driver);
 }
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index cf53ed8..1380bb7 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -290,6 +290,7 @@ extern void xen_processor_driver_register(void);
 /* in processor_perflib.c */
 
 #ifdef CONFIG_CPU_FREQ
+extern int ignore_ppc;
 void acpi_processor_ppc_init(void);
 void acpi_processor_ppc_exit(void);
 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag);
-- 
1.7.7.3


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