diff options
| -rw-r--r-- | drivers/acpi/processor_idle.c | 38 |
1 files changed, 9 insertions, 29 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 562124ed785e..60773005b8af 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -89,12 +89,6 @@ module_param(nocst, uint, 0000); static unsigned int bm_history __read_mostly = (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); module_param(bm_history, uint, 0644); - -static unsigned use_ipi = 2; -module_param(use_ipi, uint, 0644); -MODULE_PARM_DESC(use_ipi, "IPI (vs. LAPIC) irqs for not waking up from C2/C3" - " machines. 0=apic, 1=ipi, 2=auto\n"); - /* -------------------------------------------------------------------------- Power Management -------------------------------------------------------------------------- */ @@ -266,8 +260,9 @@ static void acpi_cstate_enter(struct acpi_processor_cx *cstate) /* * Some BIOS implementations switch to C3 in the published C2 state. - * This seems to be a common problem on AMD boxen and Intel Dothan/Banias - * Pentium M machines. + * This seems to be a common problem on AMD boxen, but other vendors + * are affected too. We pick the most conservative approach: we assume + * that the local APIC stops in both C2 and C3. */ static void acpi_timer_check_state(int state, struct acpi_processor *pr, struct acpi_processor_cx *cx) @@ -281,17 +276,8 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr, if (pwr->timer_broadcast_on_state < state) return; - if (cx->type >= ACPI_STATE_C2) { - if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) - pr->power.timer_broadcast_on_state = state; - else if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && - boot_cpu_data.x86 == 6) && - (boot_cpu_data.x86_model == 13 || - boot_cpu_data.x86_model == 9)) - { - pr->power.timer_broadcast_on_state = state; - } - } + if (cx->type >= ACPI_STATE_C2) + pr->power.timer_broadcast_on_state = state; } static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) @@ -306,16 +292,10 @@ static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) #else cpumask_t mask = cpumask_of_cpu(pr->id); - if (use_ipi == 0) + if (pr->power.timer_broadcast_on_state < INT_MAX) on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1); - else if (use_ipi == 1) + else on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1); - else { - if (pr->power.timer_broadcast_on_state < INT_MAX) - on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1); - else - on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1); - } #endif } @@ -1033,13 +1013,13 @@ static int acpi_processor_power_verify(struct acpi_processor *pr) case ACPI_STATE_C2: acpi_processor_power_verify_c2(cx); - if (cx->valid && use_ipi != 0 && use_ipi != 1) + if (cx->valid) acpi_timer_check_state(i, pr, cx); break; case ACPI_STATE_C3: acpi_processor_power_verify_c3(pr, cx); - if (cx->valid && use_ipi != 0 && use_ipi != 1) + if (cx->valid) acpi_timer_check_state(i, pr, cx); break; } |