#include <asm/cpu.h>
#include <asm/apic.h>
#include <asm/syscalls.h>
-#include <asm/idle.h>
#include <asm/uaccess.h>
#include <asm/mwait.h>
#include <asm/fpu/internal.h>
};
EXPORT_PER_CPU_SYMBOL(cpu_tss);
-#ifdef CONFIG_X86_64
-static DEFINE_PER_CPU(unsigned char, is_idle);
-static ATOMIC_NOTIFIER_HEAD(idle_notifier);
-
-void idle_notifier_register(struct notifier_block *n)
-{
- atomic_notifier_chain_register(&idle_notifier, n);
-}
-EXPORT_SYMBOL_GPL(idle_notifier_register);
-
-void idle_notifier_unregister(struct notifier_block *n)
-{
- atomic_notifier_chain_unregister(&idle_notifier, n);
-}
-EXPORT_SYMBOL_GPL(idle_notifier_unregister);
-#endif
-
/*
* this gets called so that we can store lazy state into memory and copy the
* current task into the new thread.
}
#endif
-#ifdef CONFIG_X86_64
-void enter_idle(void)
-{
- this_cpu_write(is_idle, 1);
- atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
-}
-
-static void __exit_idle(void)
-{
- if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
- return;
- atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);
-}
-
-/* Called from interrupts to signify idle end */
-void exit_idle(void)
-{
- /* idle loop has pid 0 */
- if (current->pid)
- return;
- __exit_idle();
-}
-#endif
-
void arch_cpu_idle_enter(void)
{
tsc_verify_tsc_adjust(false);
local_touch_nmi();
- enter_idle();
-}
-
-void arch_cpu_idle_exit(void)
-{
- __exit_idle();
}
void arch_cpu_idle_dead(void)
halt();
}
-bool amd_e400_c1e_detected;
-EXPORT_SYMBOL(amd_e400_c1e_detected);
-
-static cpumask_var_t amd_e400_c1e_mask;
-
-void amd_e400_remove_cpu(int cpu)
-{
- if (amd_e400_c1e_mask != NULL)
- cpumask_clear_cpu(cpu, amd_e400_c1e_mask);
-}
-
/*
- * AMD Erratum 400 aware idle routine. We check for C1E active in the interrupt
- * pending message MSR. If we detect C1E, then we handle it the same
- * way as C3 power states (local apic timer and TSC stop)
+ * AMD Erratum 400 aware idle routine. We handle it the same way as C3 power
+ * states (local apic timer and TSC stop).
*/
static void amd_e400_idle(void)
{
- if (!amd_e400_c1e_detected) {
- u32 lo, hi;
-
- rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
-
- if (lo & K8_INTP_C1E_ACTIVE_MASK) {
- amd_e400_c1e_detected = true;
- if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
- mark_tsc_unstable("TSC halt in AMD C1E");
- pr_info("System has AMD C1E enabled\n");
- }
+ /*
+ * We cannot use static_cpu_has_bug() here because X86_BUG_AMD_APIC_C1E
+ * gets set after static_cpu_has() places have been converted via
+ * alternatives.
+ */
+ if (!boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E)) {
+ default_idle();
+ return;
}
- if (amd_e400_c1e_detected) {
- int cpu = smp_processor_id();
+ tick_broadcast_enter();
- if (!cpumask_test_cpu(cpu, amd_e400_c1e_mask)) {
- cpumask_set_cpu(cpu, amd_e400_c1e_mask);
- /* Force broadcast so ACPI can not interfere. */
- tick_broadcast_force();
- pr_info("Switch to broadcast mode on CPU%d\n", cpu);
- }
- tick_broadcast_enter();
-
- default_idle();
+ default_idle();
- /*
- * The switch back from broadcast mode needs to be
- * called with interrupts disabled.
- */
- local_irq_disable();
- tick_broadcast_exit();
- local_irq_enable();
- } else
- default_idle();
+ /*
+ * The switch back from broadcast mode needs to be called with
+ * interrupts disabled.
+ */
+ local_irq_disable();
+ tick_broadcast_exit();
+ local_irq_enable();
}
/*
if (x86_idle || boot_option_idle_override == IDLE_POLL)
return;
- if (cpu_has_bug(c, X86_BUG_AMD_APIC_C1E)) {
- /* E400: APIC timer interrupt does not wake up CPU from C1e */
+ if (boot_cpu_has_bug(X86_BUG_AMD_E400)) {
pr_info("using AMD E400 aware idle routine\n");
x86_idle = amd_e400_idle;
} else if (prefer_mwait_c1_over_halt(c)) {
x86_idle = default_idle;
}
-void __init init_amd_e400_c1e_mask(void)
+void amd_e400_c1e_apic_setup(void)
+{
+ if (boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E)) {
+ pr_info("Switch to broadcast mode on CPU%d\n", smp_processor_id());
+ local_irq_disable();
+ tick_broadcast_force();
+ local_irq_enable();
+ }
+}
+
+void __init arch_post_acpi_subsys_init(void)
{
- /* If we're using amd_e400_idle, we need to allocate amd_e400_c1e_mask. */
- if (x86_idle == amd_e400_idle)
- zalloc_cpumask_var(&amd_e400_c1e_mask, GFP_KERNEL);
+ u32 lo, hi;
+
+ if (!boot_cpu_has_bug(X86_BUG_AMD_E400))
+ return;
+
+ /*
+ * AMD E400 detection needs to happen after ACPI has been enabled. If
+ * the machine is affected K8_INTP_C1E_ACTIVE_MASK bits are set in
+ * MSR_K8_INT_PENDING_MSG.
+ */
+ rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
+ if (!(lo & K8_INTP_C1E_ACTIVE_MASK))
+ return;
+
+ boot_cpu_set_bug(X86_BUG_AMD_APIC_C1E);
+
+ if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
+ mark_tsc_unstable("TSC halt in AMD C1E");
+ pr_info("System has AMD C1E enabled\n");
}
static int __init idle_setup(char *str)
projects / linux-2.6-block.git / blobdiff