static int acpi_processor_set_power_policy(struct acpi_processor *pr);
+#else /* CONFIG_CPU_IDLE */
+static unsigned int latency_factor __read_mostly = 2;
+module_param(latency_factor, uint, 0644);
#endif
/*
return PM_TIMER_TICKS_TO_US((0xFFFFFFFF - t1) + t2);
}
+/*
+ * Callers should disable interrupts before the call and enable
+ * interrupts after return.
+ */
static void acpi_safe_halt(void)
{
current_thread_info()->status &= ~TS_POLLING;
* test NEED_RESCHED:
*/
smp_mb();
- if (!need_resched())
+ if (!need_resched()) {
safe_halt();
+ local_irq_disable();
+ }
current_thread_info()->status |= TS_POLLING;
}
/* Common C-state entry for C2, C3, .. */
static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
{
- if (cstate->space_id == ACPI_CSTATE_FFH) {
+ if (cstate->entry_method == ACPI_CSTATE_FFH) {
/* Call into architectural FFH based C-state */
acpi_processor_ffh_cstate_enter(cstate);
} else {
return 0;
}
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
static int tsc_halts_in_c(int state)
{
switch (boot_cpu_data.x86_vendor) {
pm_idle_save();
else
acpi_safe_halt();
+
+ if (irqs_disabled())
+ local_irq_enable();
+
return;
}
* skew otherwise.
*/
sleep_ticks = 0xFFFFFFFF;
+ if (irqs_disabled())
+ local_irq_enable();
+
break;
case ACPI_STATE_C2:
/* Get end time (ticks) */
t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
/* TSC halts in C2, so notify users */
if (tsc_halts_in_c(ACPI_STATE_C2))
mark_tsc_unstable("possible TSC halt in C2");
acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
}
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
/* TSC halts in C3, so notify users */
if (tsc_halts_in_c(ACPI_STATE_C3))
mark_tsc_unstable("TSC halts in C3");
cx.address = reg->address;
cx.index = current_count + 1;
- cx.space_id = ACPI_CSTATE_SYSTEMIO;
+ cx.entry_method = ACPI_CSTATE_SYSTEMIO;
if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
if (acpi_processor_ffh_cstate_probe
(pr->id, &cx, reg) == 0) {
- cx.space_id = ACPI_CSTATE_FFH;
- } else if (cx.type != ACPI_STATE_C1) {
+ cx.entry_method = ACPI_CSTATE_FFH;
+ } else if (cx.type == ACPI_STATE_C1) {
/*
* C1 is a special case where FIXED_HARDWARE
* can be handled in non-MWAIT way as well.
* In that case, save this _CST entry info.
- * That is, we retain space_id of SYSTEM_IO for
- * halt based C1.
* Otherwise, ignore this info and continue.
*/
+ cx.entry_method = ACPI_CSTATE_HALT;
+ snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
+ } else {
continue;
}
+ } else {
+ snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
+ cx.address);
}
+
obj = &(element->package.elements[2]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
/**
* acpi_idle_do_entry - a helper function that does C2 and C3 type entry
* @cx: cstate data
+ *
+ * Caller disables interrupt before call and enables interrupt after return.
*/
static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
{
- if (cx->space_id == ACPI_CSTATE_FFH) {
+ if (cx->entry_method == ACPI_CSTATE_FFH) {
/* Call into architectural FFH based C-state */
acpi_processor_ffh_cstate_enter(cx);
+ } else if (cx->entry_method == ACPI_CSTATE_HALT) {
+ acpi_safe_halt();
} else {
int unused;
/* IO port based C-state */
static int acpi_idle_enter_c1(struct cpuidle_device *dev,
struct cpuidle_state *state)
{
+ u32 t1, t2;
struct acpi_processor *pr;
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
+
pr = processors[smp_processor_id()];
if (unlikely(!pr))
return 0;
+ local_irq_disable();
+
+ /* Do not access any ACPI IO ports in suspend path */
+ if (acpi_idle_suspend) {
+ acpi_safe_halt();
+ local_irq_enable();
+ return 0;
+ }
+
if (pr->flags.bm_check)
acpi_idle_update_bm_rld(pr, cx);
- acpi_safe_halt();
+ t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ acpi_idle_do_entry(cx);
+ t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ local_irq_enable();
cx->usage++;
- return 0;
+ return ticks_elapsed_in_us(t1, t2);
}
/**
return 0;
}
- acpi_unlazy_tlb(smp_processor_id());
/*
* Must be done before busmaster disable as we might need to
* access HPET !
acpi_idle_do_entry(cx);
t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
/* TSC could halt in idle, so notify users */
if (tsc_halts_in_c(cx->type))
mark_tsc_unstable("TSC halts in idle");;
if (dev->safe_state) {
return dev->safe_state->enter(dev, dev->safe_state);
} else {
+ local_irq_disable();
acpi_safe_halt();
+ local_irq_enable();
return 0;
}
}
return 0;
}
+ acpi_unlazy_tlb(smp_processor_id());
+
/* Tell the scheduler that we are going deep-idle: */
sched_clock_idle_sleep_event();
/*
spin_unlock(&c3_lock);
}
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
/* TSC could halt in idle, so notify users */
if (tsc_halts_in_c(ACPI_STATE_C3))
mark_tsc_unstable("TSC halts in idle");
*/
static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
{
- int i, count = 0;
+ int i, count = CPUIDLE_DRIVER_STATE_START;
struct acpi_processor_cx *cx;
struct cpuidle_state *state;
struct cpuidle_device *dev = &pr->power.dev;
return -EINVAL;
}
+ for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
+ dev->states[i].name[0] = '\0';
+ dev->states[i].desc[0] = '\0';
+ }
+
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
cx = &pr->power.states[i];
state = &dev->states[count];
cpuidle_set_statedata(state, cx);
snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
+ strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
state->exit_latency = cx->latency;
- state->target_residency = cx->latency * 6;
+ state->target_residency = cx->latency * latency_factor;
state->power_usage = cx->power;
state->flags = 0;
switch (cx->type) {
case ACPI_STATE_C1:
state->flags |= CPUIDLE_FLAG_SHALLOW;
+ if (cx->entry_method == ACPI_CSTATE_FFH)
+ state->flags |= CPUIDLE_FLAG_TIME_VALID;
+
state->enter = acpi_idle_enter_c1;
dev->safe_state = state;
break;
}
count++;
+ if (count == CPUIDLE_STATE_MAX)
+ break;
}
dev->state_count = count;
projects / linux-2.6-block.git / blobdiff