[PATCH] x86_64: Allow to run main time keeping from the local APIC interrupt

[powerpc.git] / arch / x86_64 / kernel / apic.c

diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 8fdd089..14751dd 100644 (file)
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -35,8 +35,11 @@
 #include <asm/mach_apic.h>
 #include <asm/nmi.h>
 #include <asm/idle.h>
+#include <asm/proto.h>
+#include <asm/timex.h>
 
 int apic_verbosity;
+int apic_runs_main_timer;
 
 int disable_apic_timer __initdata;
 
@@ -499,13 +502,10 @@ static int lapic_resume(struct sys_device *dev)
        if (!apic_pm_state.active)
                return 0;
 
-       /* XXX: Pavel needs this for S3 resume, but can't explain why */
-       set_fixmap_nocache(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE);
-
        local_irq_save(flags);
        rdmsr(MSR_IA32_APICBASE, l, h);
        l &= ~MSR_IA32_APICBASE_BASE;
-       l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE;
+       l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
        wrmsr(MSR_IA32_APICBASE, l, h);
        apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED);
        apic_write(APIC_ID, apic_pm_state.apic_id);
@@ -705,9 +705,17 @@ static void setup_APIC_timer(unsigned int clocks)
                        c2 |= inb_p(0x40) << 8;
                } while (c2 - c1 < 300);
        }
-
        __setup_APIC_LVTT(clocks);
-
+       /* Turn off PIT interrupt if we use APIC timer as main timer.
+          Only works with the PM timer right now
+          TBD fix it for HPET too. */
+       if (vxtime.mode == VXTIME_PMTMR &&
+               smp_processor_id() == boot_cpu_id &&
+               apic_runs_main_timer == 1 &&
+               !cpu_isset(boot_cpu_id, timer_interrupt_broadcast_ipi_mask)) {
+               stop_timer_interrupt();
+               apic_runs_main_timer++;
+       }
        local_irq_restore(flags);
 }
 
@@ -875,6 +883,8 @@ void smp_local_timer_interrupt(struct pt_regs *regs)
 #ifdef CONFIG_SMP
        update_process_times(user_mode(regs));
 #endif
+       if (apic_runs_main_timer > 1 && smp_processor_id() == boot_cpu_id)
+               main_timer_handler(regs);
        /*
         * We take the 'long' return path, and there every subsystem
         * grabs the appropriate locks (kernel lock/ irq lock).
@@ -1084,10 +1094,27 @@ static __init int setup_nolapic(char *str)
 
 static __init int setup_noapictimer(char *str) 
 { 
+       if (str[0] != ' ' && str[0] != 0)
+               return -1;
        disable_apic_timer = 1;
        return 0;
 } 
 
+static __init int setup_apicmaintimer(char *str)
+{
+       apic_runs_main_timer = 1;
+       nohpet = 1;
+       return 0;
+}
+__setup("apicmaintimer", setup_apicmaintimer);
+
+static __init int setup_noapicmaintimer(char *str)
+{
+       apic_runs_main_timer = -1;
+       return 0;
+}
+__setup("noapicmaintimer", setup_noapicmaintimer);
+
 /* dummy parsing: see setup.c */
 
 __setup("disableapic", setup_disableapic);