# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1228996177 0
# Node ID b56d5fe594aeaa0c3b884bef0913df274231c27d
# Parent 2941b1a97c6015aa5618373e4b280dfc88c16784
x86, cpufreq: Change cpufreq_driver->get so that it can get other
cpu's real physical freq.
Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
---
xen/arch/x86/acpi/cpufreq/cpufreq.c | 40 +++++++++++++++++++++++++++---------
1 files changed, 31 insertions(+), 9 deletions(-)
diff -r 2941b1a97c60 -r b56d5fe594ae xen/arch/x86/acpi/cpufreq/cpufreq.c
--- a/xen/arch/x86/acpi/cpufreq/cpufreq.c Thu Dec 11 11:48:19 2008 +0000
+++ b/xen/arch/x86/acpi/cpufreq/cpufreq.c Thu Dec 11 11:49:37 2008 +0000
@@ -131,9 +131,12 @@ struct drv_cmd {
u32 val;
};
-static void do_drv_read(struct drv_cmd *cmd)
-{
+static void do_drv_read(void *drvcmd)
+{
+ struct drv_cmd *cmd;
u32 h;
+
+ cmd = (struct drv_cmd *)drvcmd;
switch (cmd->type) {
case SYSTEM_INTEL_MSR_CAPABLE:
@@ -174,7 +177,13 @@ static void drv_read(struct drv_cmd *cmd
{
cmd->val = 0;
- do_drv_read(cmd);
+ ASSERT(cpus_weight(cmd->mask) == 1);
+
+ /* to reduce IPI for the sake of performance */
+ if (cpu_isset(smp_processor_id(), cmd->mask))
+ do_drv_read((void *)cmd);
+ else
+ on_selected_cpus( cmd->mask, do_drv_read, (void *)cmd, 0, 1);
}
static void drv_write(struct drv_cmd *cmd)
@@ -184,13 +193,21 @@ static void drv_write(struct drv_cmd *cm
static u32 get_cur_val(cpumask_t mask)
{
+ struct cpufreq_policy *policy;
struct processor_performance *perf;
struct drv_cmd cmd;
+ unsigned int cpu;
if (unlikely(cpus_empty(mask)))
return 0;
- switch (drv_data[first_cpu(mask)]->cpu_feature) {
+ cpu = first_cpu(mask);
+ policy = cpufreq_cpu_policy[cpu];
+
+ if (!policy)
+ return 0;
+
+ switch (drv_data[policy->cpu]->cpu_feature) {
case SYSTEM_INTEL_MSR_CAPABLE:
cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
@@ -205,7 +222,7 @@ static u32 get_cur_val(cpumask_t mask)
return 0;
}
- cmd.mask = mask;
+ cmd.mask = cpumask_of_cpu(cpu);
drv_read(&cmd);
return cmd.val;
@@ -280,13 +297,18 @@ static unsigned int get_measured_perf(un
static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
{
- struct acpi_cpufreq_data *data = drv_data[cpu];
+ struct cpufreq_policy *policy;
+ struct acpi_cpufreq_data *data;
unsigned int freq;
+ policy = cpufreq_cpu_policy[cpu];
+ if (!policy)
+ return 0;
+
+ data = drv_data[policy->cpu];
if (unlikely(data == NULL ||
- data->acpi_data == NULL || data->freq_table == NULL)) {
- return 0;
- }
+ data->acpi_data == NULL || data->freq_table == NULL))
+ return 0;
freq = extract_freq(get_cur_val(cpumask_of_cpu(cpu)), data);
return freq;
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