diff options
Diffstat (limited to 'arch/x86_64/kernel/apic.c')
| -rw-r--r-- | arch/x86_64/kernel/apic.c | 89 |
1 files changed, 80 insertions, 9 deletions
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c index 5d3c5b07b8d..6147770b434 100644 --- a/arch/x86_64/kernel/apic.c +++ b/arch/x86_64/kernel/apic.c @@ -35,8 +35,12 @@ #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 apic_calibrate_pmtmr __initdata; int disable_apic_timer __initdata; @@ -68,6 +72,26 @@ int get_maxlvt(void) return maxlvt; } +/* + * 'what should we do if we get a hw irq event on an illegal vector'. + * each architecture has to answer this themselves. + */ +void ack_bad_irq(unsigned int irq) +{ + printk("unexpected IRQ trap at vector %02x\n", irq); + /* + * Currently unexpected vectors happen only on SMP and APIC. + * We _must_ ack these because every local APIC has only N + * irq slots per priority level, and a 'hanging, unacked' IRQ + * holds up an irq slot - in excessive cases (when multiple + * unexpected vectors occur) that might lock up the APIC + * completely. + * But don't ack when the APIC is disabled. -AK + */ + if (!disable_apic) + ack_APIC_irq(); +} + void clear_local_APIC(void) { int maxlvt; @@ -702,9 +726,17 @@ 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); } @@ -735,14 +767,27 @@ static int __init calibrate_APIC_clock(void) __setup_APIC_LVTT(1000000000); apic_start = apic_read(APIC_TMCCT); - rdtscl(tsc_start); - - do { +#ifdef CONFIG_X86_PM_TIMER + if (apic_calibrate_pmtmr && pmtmr_ioport) { + pmtimer_wait(5000); /* 5ms wait */ apic = apic_read(APIC_TMCCT); - rdtscl(tsc); - } while ((tsc - tsc_start) < TICK_COUNT && (apic - apic_start) < TICK_COUNT); + result = (apic_start - apic) * 1000L / 5; + } else +#endif + { + rdtscl(tsc_start); + + do { + apic = apic_read(APIC_TMCCT); + rdtscl(tsc); + } while ((tsc - tsc_start) < TICK_COUNT && + (apic - apic_start) < TICK_COUNT); + + result = (apic_start - apic) * 1000L * cpu_khz / + (tsc - tsc_start); + } + printk("result %d\n", result); - result = (apic_start - apic) * 1000L * cpu_khz / (tsc - tsc_start); printk(KERN_INFO "Detected %d.%03d MHz APIC timer.\n", result / 1000 / 1000, result / 1000 % 1000); @@ -872,6 +917,8 @@ 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). @@ -924,7 +971,7 @@ void smp_apic_timer_interrupt(struct pt_regs *regs) * multi-chassis. Use available data to take a good guess. * If in doubt, go HPET. */ -__init int oem_force_hpet_timer(void) +__cpuinit int oem_force_hpet_timer(void) { int i, clusters, zeros; unsigned id; @@ -1081,10 +1128,34 @@ 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); + +static __init int setup_apicpmtimer(char *s) +{ + apic_calibrate_pmtmr = 1; + return setup_apicmaintimer(NULL); +} +__setup("apicpmtimer", setup_apicpmtimer); + /* dummy parsing: see setup.c */ __setup("disableapic", setup_disableapic); |