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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-4.1-testing] cpuidle: initialize default Cstate information
# HG changeset patch
# User Kevin Tian <kevin.tian@xxxxxxxxx>
# Date 1314004454 -3600
# Node ID 9dd0eb4f20d4500cecfe17dc50368d20906223a4
# Parent a79c1d5b946edce0f9f5b4bda061e2ad98adc4da
cpuidle: initialize default Cstate information
C0/C1 should be always available when cpuidle is enabled in Xen.
When there's case that Dom0 doesn't register ACPI Cstate information,
e.g. due to BIOS issue or acpi processor module is not installed,
this patch provides basic C0/C1 information available to xenpm tool.
Signed-off-by: Kevin Tian <kevin.tian@xxxxxxxxx>
xen-unstable changeset: 23662:2faba14bac13
xen-unstable date: Fri Jul 08 08:32:37 2011 +0100
---
diff -r a79c1d5b946e -r 9dd0eb4f20d4 xen/arch/x86/acpi/cpu_idle.c
--- a/xen/arch/x86/acpi/cpu_idle.c Fri Aug 19 10:00:25 2011 +0100
+++ b/xen/arch/x86/acpi/cpu_idle.c Mon Aug 22 10:14:14 2011 +0100
@@ -52,6 +52,8 @@
#include <public/sysctl.h>
#include <acpi/cpufreq/cpufreq.h>
#include <asm/apic.h>
+#include <xen/notifier.h>
+#include <xen/cpu.h>
/*#define DEBUG_PM_CX*/
@@ -598,23 +600,51 @@
halt();
}
-static int init_cx_pminfo(struct acpi_processor_power *acpi_power)
+static int cpuidle_init_cpu(int cpu)
{
- int i;
+ struct acpi_processor_power *acpi_power;
- memset(acpi_power, 0, sizeof(*acpi_power));
+ acpi_power = processor_powers[cpu];
+ if ( !acpi_power )
+ {
+ int i;
+ acpi_power = xmalloc(struct acpi_processor_power);
+ if ( !acpi_power )
+ return -ENOMEM;
+ memset(acpi_power, 0, sizeof(*acpi_power));
- for ( i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++ )
- acpi_power->states[i].idx = i;
+ for ( i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++ )
+ acpi_power->states[i].idx = i;
+
+ acpi_power->states[ACPI_STATE_C1].type = ACPI_STATE_C1;
+ acpi_power->states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_EM_HALT;
+
+ acpi_power->states[ACPI_STATE_C0].valid = 1;
+ acpi_power->states[ACPI_STATE_C1].valid = 1;
+
+ acpi_power->count = 2;
+ acpi_power->safe_state = &acpi_power->states[ACPI_STATE_C1];
+ acpi_power->cpu = cpu;
+ processor_powers[cpu] = acpi_power;
+ }
- acpi_power->states[ACPI_STATE_C1].type = ACPI_STATE_C1;
- acpi_power->states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_EM_HALT;
-
- acpi_power->states[ACPI_STATE_C0].valid = 1;
- acpi_power->states[ACPI_STATE_C1].valid = 1;
-
- acpi_power->count = 2;
- acpi_power->safe_state = &acpi_power->states[ACPI_STATE_C1];
+ if ( cpu == 0 )
+ {
+ if ( boot_cpu_has(X86_FEATURE_NONSTOP_TSC) )
+ {
+ get_tick = get_stime_tick;
+ ticks_elapsed = stime_ticks_elapsed;
+ tick_to_ns = stime_tick_to_ns;
+ ns_to_tick = ns_to_stime_tick;
+ }
+ else
+ {
+ get_tick = get_acpi_pm_tick;
+ ticks_elapsed = acpi_pm_ticks_elapsed;
+ tick_to_ns = acpi_pm_tick_to_ns;
+ ns_to_tick = ns_to_acpi_pm_tick;
+ }
+ }
return 0;
}
@@ -943,7 +973,7 @@
XEN_GUEST_HANDLE(xen_processor_cx_t) states;
xen_processor_cx_t xen_cx;
struct acpi_processor_power *acpi_power;
- int cpu_id, i;
+ int cpu_id, i, ret;
if ( unlikely(!guest_handle_okay(power->states, power->count)) )
return -EFAULT;
@@ -955,46 +985,19 @@
if ( cpu_id == -1 )
{
printk(XENLOG_ERR "no cpu_id for acpi_id %d\n", cpu);
- return -EFAULT;
+ return -EINVAL;
}
- if ( cpu_id == 0 )
- {
- if ( boot_cpu_has(X86_FEATURE_NONSTOP_TSC) )
- {
- get_tick = get_stime_tick;
- ticks_elapsed = stime_ticks_elapsed;
- tick_to_ns = stime_tick_to_ns;
- ns_to_tick = ns_to_stime_tick;
- }
- else
- {
- get_tick = get_acpi_pm_tick;
- ticks_elapsed = acpi_pm_ticks_elapsed;
- tick_to_ns = acpi_pm_tick_to_ns;
- ns_to_tick = ns_to_acpi_pm_tick;
- }
- }
-
+ ret = cpuidle_init_cpu(cpu_id);
+ if ( ret < 0 )
+ return ret;
+
acpi_power = processor_powers[cpu_id];
- if ( !acpi_power )
- {
- acpi_power = xmalloc(struct acpi_processor_power);
- if ( !acpi_power )
- return -ENOMEM;
- memset(acpi_power, 0, sizeof(*acpi_power));
- processor_powers[cpu_id] = acpi_power;
- }
-
- init_cx_pminfo(acpi_power);
-
- acpi_power->cpu = cpu_id;
acpi_power->flags.bm_check = power->flags.bm_check;
acpi_power->flags.bm_control = power->flags.bm_control;
acpi_power->flags.has_cst = power->flags.has_cst;
states = power->states;
-
for ( i = 0; i < power->count; i++ )
{
if ( unlikely(copy_from_guest_offset(&xen_cx, states, i, 1)) )
@@ -1009,19 +1012,17 @@
/* FIXME: C-state dependency is not supported by far */
- /*print_acpi_power(cpu_id, acpi_power);*/
-
- if ( cpu_id == 0 && pm_idle_save == NULL )
- {
- pm_idle_save = pm_idle;
- pm_idle = acpi_processor_idle;
- }
-
if ( cpu_id == 0 )
{
+ if ( pm_idle_save == NULL )
+ {
+ pm_idle_save = pm_idle;
+ pm_idle = acpi_processor_idle;
+ }
+
dead_idle = acpi_dead_idle;
}
-
+
return 0;
}
@@ -1032,7 +1033,7 @@
int pmstat_get_cx_stat(uint32_t cpuid, struct pm_cx_stat *stat)
{
- const struct acpi_processor_power *power = processor_powers[cpuid];
+ struct acpi_processor_power *power = processor_powers[cpuid];
uint64_t usage, res, idle_usage = 0, idle_res = 0;
int i;
struct hw_residencies hw_res = {0};
@@ -1049,6 +1050,30 @@
stat->nr = power->count;
stat->idle_time = get_cpu_idle_time(cpuid);
+ /* mimic the stat when detail info hasn't been registered by dom0 */
+ if ( pm_idle_save == NULL )
+ {
+ /* C1 */
+ usage = 1;
+ res = stat->idle_time;
+ if ( copy_to_guest_offset(stat->triggers, 1, &usage, 1) ||
+ copy_to_guest_offset(stat->residencies, 1, &res, 1) )
+ return -EFAULT;
+
+ /* C0 */
+ res = NOW() - res;
+ if ( copy_to_guest_offset(stat->triggers, 0, &usage, 1) ||
+ copy_to_guest_offset(stat->residencies, 0, &res, 1) )
+ return -EFAULT;
+
+ stat->pc3 = 0;
+ stat->pc6 = 0;
+ stat->pc7 = 0;
+ stat->cc3 = 0;
+ stat->cc6 = 0;
+ return 0;
+ }
+
for ( i = power->count - 1; i >= 0; i-- )
{
if ( i != 0 )
@@ -1103,3 +1128,36 @@
{
return xen_cpuidle && max_cstate > (local_apic_timer_c2_ok ? 2 : 1);
}
+
+static int cpu_callback(
+ struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+
+ /* Only hook on CPU_ONLINE because a dead cpu may utilize the info to
+ * to enter deep C-state */
+ switch ( action )
+ {
+ case CPU_ONLINE:
+ (void)cpuidle_init_cpu(cpu);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block cpu_nfb = {
+ .notifier_call = cpu_callback
+};
+
+static int __init cpuidle_presmp_init(void)
+{
+ void *cpu = (void *)(long)smp_processor_id();
+ cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
+ register_cpu_notifier(&cpu_nfb);
+ return 0;
+}
+presmp_initcall(cpuidle_presmp_init);
+
diff -r a79c1d5b946e -r 9dd0eb4f20d4 xen/arch/x86/smpboot.c
--- a/xen/arch/x86/smpboot.c Fri Aug 19 10:00:25 2011 +0100
+++ b/xen/arch/x86/smpboot.c Mon Aug 22 10:14:14 2011 +0100
@@ -45,7 +45,6 @@
#include <mach_apic.h>
#include <mach_wakecpu.h>
#include <smpboot_hooks.h>
-#include <acpi/cpufreq/processor_perf.h>
#define setup_trampoline() (bootsym_phys(trampoline_realmode_entry))
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