| /* |
| * Local APIC handling, local APIC timers |
| * |
| * (c) 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com> |
| * |
| * Fixes |
| * Maciej W. Rozycki : Bits for genuine 82489DX APICs; |
| * thanks to Eric Gilmore |
| * and Rolf G. Tews |
| * for testing these extensively. |
| * Maciej W. Rozycki : Various updates and fixes. |
| * Mikael Pettersson : Power Management for UP-APIC. |
| * Pavel Machek and |
| * Mikael Pettersson : PM converted to driver model. |
| */ |
| |
| #include <linux/kernel_stat.h> |
| #include <linux/mc146818rtc.h> |
| #include <linux/acpi_pmtmr.h> |
| #include <linux/clockchips.h> |
| #include <linux/interrupt.h> |
| #include <linux/bootmem.h> |
| #include <linux/ftrace.h> |
| #include <linux/ioport.h> |
| #include <linux/module.h> |
| #include <linux/sysdev.h> |
| #include <linux/delay.h> |
| #include <linux/timex.h> |
| #include <linux/dmar.h> |
| #include <linux/init.h> |
| #include <linux/cpu.h> |
| #include <linux/dmi.h> |
| #include <linux/nmi.h> |
| #include <linux/smp.h> |
| #include <linux/mm.h> |
| |
| #include <asm/pgalloc.h> |
| #include <asm/atomic.h> |
| #include <asm/mpspec.h> |
| #include <asm/i8253.h> |
| #include <asm/i8259.h> |
| #include <asm/proto.h> |
| #include <asm/apic.h> |
| #include <asm/desc.h> |
| #include <asm/hpet.h> |
| #include <asm/idle.h> |
| #include <asm/mtrr.h> |
| #include <asm/smp.h> |
| #include <asm/mce.h> |
| |
| unsigned int num_processors; |
| |
| unsigned disabled_cpus __cpuinitdata; |
| |
| /* Processor that is doing the boot up */ |
| unsigned int boot_cpu_physical_apicid = -1U; |
| |
| /* |
| * The highest APIC ID seen during enumeration. |
| * |
| * This determines the messaging protocol we can use: if all APIC IDs |
| * are in the 0 ... 7 range, then we can use logical addressing which |
| * has some performance advantages (better broadcasting). |
| * |
| * If there's an APIC ID above 8, we use physical addressing. |
| */ |
| unsigned int max_physical_apicid; |
| |
| /* |
| * Bitmask of physically existing CPUs: |
| */ |
| physid_mask_t phys_cpu_present_map; |
| |
| /* |
| * Map cpu index to physical APIC ID |
| */ |
| DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID); |
| DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID); |
| EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); |
| EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); |
| |
| #ifdef CONFIG_X86_32 |
| /* |
| * Knob to control our willingness to enable the local APIC. |
| * |
| * +1=force-enable |
| */ |
| static int force_enable_local_apic; |
| /* |
| * APIC command line parameters |
| */ |
| static int __init parse_lapic(char *arg) |
| { |
| force_enable_local_apic = 1; |
| return 0; |
| } |
| early_param("lapic", parse_lapic); |
| /* Local APIC was disabled by the BIOS and enabled by the kernel */ |
| static int enabled_via_apicbase; |
| |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| static int apic_calibrate_pmtmr __initdata; |
| static __init int setup_apicpmtimer(char *s) |
| { |
| apic_calibrate_pmtmr = 1; |
| notsc_setup(NULL); |
| return 0; |
| } |
| __setup("apicpmtimer", setup_apicpmtimer); |
| #endif |
| |
| #ifdef CONFIG_X86_X2APIC |
| int x2apic; |
| /* x2apic enabled before OS handover */ |
| static int x2apic_preenabled; |
| static int disable_x2apic; |
| static __init int setup_nox2apic(char *str) |
| { |
| disable_x2apic = 1; |
| setup_clear_cpu_cap(X86_FEATURE_X2APIC); |
| return 0; |
| } |
| early_param("nox2apic", setup_nox2apic); |
| #endif |
| |
| unsigned long mp_lapic_addr; |
| int disable_apic; |
| /* Disable local APIC timer from the kernel commandline or via dmi quirk */ |
| static int disable_apic_timer __cpuinitdata; |
| /* Local APIC timer works in C2 */ |
| int local_apic_timer_c2_ok; |
| EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); |
| |
| int first_system_vector = 0xfe; |
| |
| /* |
| * Debug level, exported for io_apic.c |
| */ |
| unsigned int apic_verbosity; |
| |
| int pic_mode; |
| |
| /* Have we found an MP table */ |
| int smp_found_config; |
| |
| static struct resource lapic_resource = { |
| .name = "Local APIC", |
| .flags = IORESOURCE_MEM | IORESOURCE_BUSY, |
| }; |
| |
| static unsigned int calibration_result; |
| |
| static int lapic_next_event(unsigned long delta, |
| struct clock_event_device *evt); |
| static void lapic_timer_setup(enum clock_event_mode mode, |
| struct clock_event_device *evt); |
| static void lapic_timer_broadcast(const struct cpumask *mask); |
| static void apic_pm_activate(void); |
| |
| /* |
| * The local apic timer can be used for any function which is CPU local. |
| */ |
| static struct clock_event_device lapic_clockevent = { |
| .name = "lapic", |
| .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
| | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY, |
| .shift = 32, |
| .set_mode = lapic_timer_setup, |
| .set_next_event = lapic_next_event, |
| .broadcast = lapic_timer_broadcast, |
| .rating = 100, |
| .irq = -1, |
| }; |
| static DEFINE_PER_CPU(struct clock_event_device, lapic_events); |
| |
| static unsigned long apic_phys; |
| |
| /* |
| * Get the LAPIC version |
| */ |
| static inline int lapic_get_version(void) |
| { |
| return GET_APIC_VERSION(apic_read(APIC_LVR)); |
| } |
| |
| /* |
| * Check, if the APIC is integrated or a separate chip |
| */ |
| static inline int lapic_is_integrated(void) |
| { |
| #ifdef CONFIG_X86_64 |
| return 1; |
| #else |
| return APIC_INTEGRATED(lapic_get_version()); |
| #endif |
| } |
| |
| /* |
| * Check, whether this is a modern or a first generation APIC |
| */ |
| static int modern_apic(void) |
| { |
| /* AMD systems use old APIC versions, so check the CPU */ |
| if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && |
| boot_cpu_data.x86 >= 0xf) |
| return 1; |
| return lapic_get_version() >= 0x14; |
| } |
| |
| void native_apic_wait_icr_idle(void) |
| { |
| while (apic_read(APIC_ICR) & APIC_ICR_BUSY) |
| cpu_relax(); |
| } |
| |
| u32 native_safe_apic_wait_icr_idle(void) |
| { |
| u32 send_status; |
| int timeout; |
| |
| timeout = 0; |
| do { |
| send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY; |
| if (!send_status) |
| break; |
| udelay(100); |
| } while (timeout++ < 1000); |
| |
| return send_status; |
| } |
| |
| void native_apic_icr_write(u32 low, u32 id) |
| { |
| apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id)); |
| apic_write(APIC_ICR, low); |
| } |
| |
| u64 native_apic_icr_read(void) |
| { |
| u32 icr1, icr2; |
| |
| icr2 = apic_read(APIC_ICR2); |
| icr1 = apic_read(APIC_ICR); |
| |
| return icr1 | ((u64)icr2 << 32); |
| } |
| |
| /** |
| * enable_NMI_through_LVT0 - enable NMI through local vector table 0 |
| */ |
| void __cpuinit enable_NMI_through_LVT0(void) |
| { |
| unsigned int v; |
| |
| /* unmask and set to NMI */ |
| v = APIC_DM_NMI; |
| |
| /* Level triggered for 82489DX (32bit mode) */ |
| if (!lapic_is_integrated()) |
| v |= APIC_LVT_LEVEL_TRIGGER; |
| |
| apic_write(APIC_LVT0, v); |
| } |
| |
| #ifdef CONFIG_X86_32 |
| /** |
| * get_physical_broadcast - Get number of physical broadcast IDs |
| */ |
| int get_physical_broadcast(void) |
| { |
| return modern_apic() ? 0xff : 0xf; |
| } |
| #endif |
| |
| /** |
| * lapic_get_maxlvt - get the maximum number of local vector table entries |
| */ |
| int lapic_get_maxlvt(void) |
| { |
| unsigned int v; |
| |
| v = apic_read(APIC_LVR); |
| /* |
| * - we always have APIC integrated on 64bit mode |
| * - 82489DXs do not report # of LVT entries |
| */ |
| return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2; |
| } |
| |
| /* |
| * Local APIC timer |
| */ |
| |
| /* Clock divisor */ |
| #define APIC_DIVISOR 16 |
| |
| /* |
| * This function sets up the local APIC timer, with a timeout of |
| * 'clocks' APIC bus clock. During calibration we actually call |
| * this function twice on the boot CPU, once with a bogus timeout |
| * value, second time for real. The other (noncalibrating) CPUs |
| * call this function only once, with the real, calibrated value. |
| * |
| * We do reads before writes even if unnecessary, to get around the |
| * P5 APIC double write bug. |
| */ |
| static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen) |
| { |
| unsigned int lvtt_value, tmp_value; |
| |
| lvtt_value = LOCAL_TIMER_VECTOR; |
| if (!oneshot) |
| lvtt_value |= APIC_LVT_TIMER_PERIODIC; |
| if (!lapic_is_integrated()) |
| lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); |
| |
| if (!irqen) |
| lvtt_value |= APIC_LVT_MASKED; |
| |
| apic_write(APIC_LVTT, lvtt_value); |
| |
| /* |
| * Divide PICLK by 16 |
| */ |
| tmp_value = apic_read(APIC_TDCR); |
| apic_write(APIC_TDCR, |
| (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | |
| APIC_TDR_DIV_16); |
| |
| if (!oneshot) |
| apic_write(APIC_TMICT, clocks / APIC_DIVISOR); |
| } |
| |
| /* |
| * Setup extended LVT, AMD specific (K8, family 10h) |
| * |
| * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and |
| * MCE interrupts are supported. Thus MCE offset must be set to 0. |
| * |
| * If mask=1, the LVT entry does not generate interrupts while mask=0 |
| * enables the vector. See also the BKDGs. |
| */ |
| |
| #define APIC_EILVT_LVTOFF_MCE 0 |
| #define APIC_EILVT_LVTOFF_IBS 1 |
| |
| static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask) |
| { |
| unsigned long reg = (lvt_off << 4) + APIC_EILVT0; |
| unsigned int v = (mask << 16) | (msg_type << 8) | vector; |
| |
| apic_write(reg, v); |
| } |
| |
| u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask) |
| { |
| setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask); |
| return APIC_EILVT_LVTOFF_MCE; |
| } |
| |
| u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask) |
| { |
| setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask); |
| return APIC_EILVT_LVTOFF_IBS; |
| } |
| EXPORT_SYMBOL_GPL(setup_APIC_eilvt_ibs); |
| |
| /* |
| * Program the next event, relative to now |
| */ |
| static int lapic_next_event(unsigned long delta, |
| struct clock_event_device *evt) |
| { |
| apic_write(APIC_TMICT, delta); |
| return 0; |
| } |
| |
| /* |
| * Setup the lapic timer in periodic or oneshot mode |
| */ |
| static void lapic_timer_setup(enum clock_event_mode mode, |
| struct clock_event_device *evt) |
| { |
| unsigned long flags; |
| unsigned int v; |
| |
| /* Lapic used as dummy for broadcast ? */ |
| if (evt->features & CLOCK_EVT_FEAT_DUMMY) |
| return; |
| |
| local_irq_save(flags); |
| |
| switch (mode) { |
| case CLOCK_EVT_MODE_PERIODIC: |
| case CLOCK_EVT_MODE_ONESHOT: |
| __setup_APIC_LVTT(calibration_result, |
| mode != CLOCK_EVT_MODE_PERIODIC, 1); |
| break; |
| case CLOCK_EVT_MODE_UNUSED: |
| case CLOCK_EVT_MODE_SHUTDOWN: |
| v = apic_read(APIC_LVTT); |
| v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); |
| apic_write(APIC_LVTT, v); |
| apic_write(APIC_TMICT, 0xffffffff); |
| break; |
| case CLOCK_EVT_MODE_RESUME: |
| /* Nothing to do here */ |
| break; |
| } |
| |
| local_irq_restore(flags); |
| } |
| |
| /* |
| * Local APIC timer broadcast function |
| */ |
| static void lapic_timer_broadcast(const struct cpumask *mask) |
| { |
| #ifdef CONFIG_SMP |
| apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR); |
| #endif |
| } |
| |
| /* |
| * Setup the local APIC timer for this CPU. Copy the initilized values |
| * of the boot CPU and register the clock event in the framework. |
| */ |
| static void __cpuinit setup_APIC_timer(void) |
| { |
| struct clock_event_device *levt = &__get_cpu_var(lapic_events); |
| |
| memcpy(levt, &lapic_clockevent, sizeof(*levt)); |
| levt->cpumask = cpumask_of(smp_processor_id()); |
| |
| clockevents_register_device(levt); |
| } |
| |
| /* |
| * In this functions we calibrate APIC bus clocks to the external timer. |
| * |
| * We want to do the calibration only once since we want to have local timer |
| * irqs syncron. CPUs connected by the same APIC bus have the very same bus |
| * frequency. |
| * |
| * This was previously done by reading the PIT/HPET and waiting for a wrap |
| * around to find out, that a tick has elapsed. I have a box, where the PIT |
| * readout is broken, so it never gets out of the wait loop again. This was |
| * also reported by others. |
| * |
| * Monitoring the jiffies value is inaccurate and the clockevents |
| * infrastructure allows us to do a simple substitution of the interrupt |
| * handler. |
| * |
| * The calibration routine also uses the pm_timer when possible, as the PIT |
| * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes |
| * back to normal later in the boot process). |
| */ |
| |
| #define LAPIC_CAL_LOOPS (HZ/10) |
| |
| static __initdata int lapic_cal_loops = -1; |
| static __initdata long lapic_cal_t1, lapic_cal_t2; |
| static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2; |
| static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2; |
| static __initdata unsigned long lapic_cal_j1, lapic_cal_j2; |
| |
| /* |
| * Temporary interrupt handler. |
| */ |
| static void __init lapic_cal_handler(struct clock_event_device *dev) |
| { |
| unsigned long long tsc = 0; |
| long tapic = apic_read(APIC_TMCCT); |
| unsigned long pm = acpi_pm_read_early(); |
| |
| if (cpu_has_tsc) |
| rdtscll(tsc); |
| |
| switch (lapic_cal_loops++) { |
| case 0: |
| lapic_cal_t1 = tapic; |
| lapic_cal_tsc1 = tsc; |
| lapic_cal_pm1 = pm; |
| lapic_cal_j1 = jiffies; |
| break; |
| |
| case LAPIC_CAL_LOOPS: |
| lapic_cal_t2 = tapic; |
| lapic_cal_tsc2 = tsc; |
| if (pm < lapic_cal_pm1) |
| pm += ACPI_PM_OVRRUN; |
| lapic_cal_pm2 = pm; |
| lapic_cal_j2 = jiffies; |
| break; |
| } |
| } |
| |
| static int __init |
| calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc) |
| { |
| const long pm_100ms = PMTMR_TICKS_PER_SEC / 10; |
| const long pm_thresh = pm_100ms / 100; |
| unsigned long mult; |
| u64 res; |
| |
| #ifndef CONFIG_X86_PM_TIMER |
| return -1; |
| #endif |
| |
| apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm); |
| |
| /* Check, if the PM timer is available */ |
| if (!deltapm) |
| return -1; |
| |
| mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22); |
| |
| if (deltapm > (pm_100ms - pm_thresh) && |
| deltapm < (pm_100ms + pm_thresh)) { |
| apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n"); |
| return 0; |
| } |
| |
| res = (((u64)deltapm) * mult) >> 22; |
| do_div(res, 1000000); |
| pr_warning("APIC calibration not consistent " |
| "with PM-Timer: %ldms instead of 100ms\n",(long)res); |
| |
| /* Correct the lapic counter value */ |
| res = (((u64)(*delta)) * pm_100ms); |
| do_div(res, deltapm); |
| pr_info("APIC delta adjusted to PM-Timer: " |
| "%lu (%ld)\n", (unsigned long)res, *delta); |
| *delta = (long)res; |
| |
| /* Correct the tsc counter value */ |
| if (cpu_has_tsc) { |
| res = (((u64)(*deltatsc)) * pm_100ms); |
| do_div(res, deltapm); |
| apic_printk(APIC_VERBOSE, "TSC delta adjusted to " |
| "PM-Timer: %lu (%ld) \n", |
| (unsigned long)res, *deltatsc); |
| *deltatsc = (long)res; |
| } |
| |
| return 0; |
| } |
| |
| static int __init calibrate_APIC_clock(void) |
| { |
| struct clock_event_device *levt = &__get_cpu_var(lapic_events); |
| void (*real_handler)(struct clock_event_device *dev); |
| unsigned long deltaj; |
| long delta, deltatsc; |
| int pm_referenced = 0; |
| |
| local_irq_disable(); |
| |
| /* Replace the global interrupt handler */ |
| real_handler = global_clock_event->event_handler; |
| global_clock_event->event_handler = lapic_cal_handler; |
| |
| /* |
| * Setup the APIC counter to maximum. There is no way the lapic |
| * can underflow in the 100ms detection time frame |
| */ |
| __setup_APIC_LVTT(0xffffffff, 0, 0); |
| |
| /* Let the interrupts run */ |
| local_irq_enable(); |
| |
| while (lapic_cal_loops <= LAPIC_CAL_LOOPS) |
| cpu_relax(); |
| |
| local_irq_disable(); |
| |
| /* Restore the real event handler */ |
| global_clock_event->event_handler = real_handler; |
| |
| /* Build delta t1-t2 as apic timer counts down */ |
| delta = lapic_cal_t1 - lapic_cal_t2; |
| apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta); |
| |
| deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1); |
| |
| /* we trust the PM based calibration if possible */ |
| pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1, |
| &delta, &deltatsc); |
| |
| /* Calculate the scaled math multiplication factor */ |
| lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS, |
| lapic_clockevent.shift); |
| lapic_clockevent.max_delta_ns = |
| clockevent_delta2ns(0x7FFFFF, &lapic_clockevent); |
| lapic_clockevent.min_delta_ns = |
| clockevent_delta2ns(0xF, &lapic_clockevent); |
| |
| calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS; |
| |
| apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta); |
| apic_printk(APIC_VERBOSE, "..... mult: %ld\n", lapic_clockevent.mult); |
| apic_printk(APIC_VERBOSE, "..... calibration result: %u\n", |
| calibration_result); |
| |
| if (cpu_has_tsc) { |
| apic_printk(APIC_VERBOSE, "..... CPU clock speed is " |
| "%ld.%04ld MHz.\n", |
| (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ), |
| (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ)); |
| } |
| |
| apic_printk(APIC_VERBOSE, "..... host bus clock speed is " |
| "%u.%04u MHz.\n", |
| calibration_result / (1000000 / HZ), |
| calibration_result % (1000000 / HZ)); |
| |
| /* |
| * Do a sanity check on the APIC calibration result |
| */ |
| if (calibration_result < (1000000 / HZ)) { |
| local_irq_enable(); |
| pr_warning("APIC frequency too slow, disabling apic timer\n"); |
| return -1; |
| } |
| |
| levt->features &= ~CLOCK_EVT_FEAT_DUMMY; |
| |
| /* |
| * PM timer calibration failed or not turned on |
| * so lets try APIC timer based calibration |
| */ |
| if (!pm_referenced) { |
| apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); |
| |
| /* |
| * Setup the apic timer manually |
| */ |
| levt->event_handler = lapic_cal_handler; |
| lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt); |
| lapic_cal_loops = -1; |
| |
| /* Let the interrupts run */ |
| local_irq_enable(); |
| |
| while (lapic_cal_loops <= LAPIC_CAL_LOOPS) |
| cpu_relax(); |
| |
| /* Stop the lapic timer */ |
| lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt); |
| |
| /* Jiffies delta */ |
| deltaj = lapic_cal_j2 - lapic_cal_j1; |
| apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj); |
| |
| /* Check, if the jiffies result is consistent */ |
| if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2) |
| apic_printk(APIC_VERBOSE, "... jiffies result ok\n"); |
| else |
| levt->features |= CLOCK_EVT_FEAT_DUMMY; |
| } else |
| local_irq_enable(); |
| |
| if (levt->features & CLOCK_EVT_FEAT_DUMMY) { |
| pr_warning("APIC timer disabled due to verification failure\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Setup the boot APIC |
| * |
| * Calibrate and verify the result. |
| */ |
| void __init setup_boot_APIC_clock(void) |
| { |
| /* |
| * The local apic timer can be disabled via the kernel |
| * commandline or from the CPU detection code. Register the lapic |
| * timer as a dummy clock event source on SMP systems, so the |
| * broadcast mechanism is used. On UP systems simply ignore it. |
| */ |
| if (disable_apic_timer) { |
| pr_info("Disabling APIC timer\n"); |
| /* No broadcast on UP ! */ |
| if (num_possible_cpus() > 1) { |
| lapic_clockevent.mult = 1; |
| setup_APIC_timer(); |
| } |
| return; |
| } |
| |
| apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n" |
| "calibrating APIC timer ...\n"); |
| |
| if (calibrate_APIC_clock()) { |
| /* No broadcast on UP ! */ |
| if (num_possible_cpus() > 1) |
| setup_APIC_timer(); |
| return; |
| } |
| |
| /* |
| * If nmi_watchdog is set to IO_APIC, we need the |
| * PIT/HPET going. Otherwise register lapic as a dummy |
| * device. |
| */ |
| if (nmi_watchdog != NMI_IO_APIC) |
| lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; |
| else |
| pr_warning("APIC timer registered as dummy," |
| " due to nmi_watchdog=%d!\n", nmi_watchdog); |
| |
| /* Setup the lapic or request the broadcast */ |
| setup_APIC_timer(); |
| } |
| |
| void __cpuinit setup_secondary_APIC_clock(void) |
| { |
| setup_APIC_timer(); |
| } |
| |
| /* |
| * The guts of the apic timer interrupt |
| */ |
| static void local_apic_timer_interrupt(void) |
| { |
| int cpu = smp_processor_id(); |
| struct clock_event_device *evt = &per_cpu(lapic_events, cpu); |
| |
| /* |
| * Normally we should not be here till LAPIC has been initialized but |
| * in some cases like kdump, its possible that there is a pending LAPIC |
| * timer interrupt from previous kernel's context and is delivered in |
| * new kernel the moment interrupts are enabled. |
| * |
| * Interrupts are enabled early and LAPIC is setup much later, hence |
| * its possible that when we get here evt->event_handler is NULL. |
| * Check for event_handler being NULL and discard the interrupt as |
| * spurious. |
| */ |
| if (!evt->event_handler) { |
| pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu); |
| /* Switch it off */ |
| lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt); |
| return; |
| } |
| |
| /* |
| * the NMI deadlock-detector uses this. |
| */ |
| inc_irq_stat(apic_timer_irqs); |
| |
| evt->event_handler(evt); |
| } |
| |
| /* |
| * Local APIC timer interrupt. This is the most natural way for doing |
| * local interrupts, but local timer interrupts can be emulated by |
| * broadcast interrupts too. [in case the hw doesn't support APIC timers] |
| * |
| * [ if a single-CPU system runs an SMP kernel then we call the local |
| * interrupt as well. Thus we cannot inline the local irq ... ] |
| */ |
| void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) |
| { |
| struct pt_regs *old_regs = set_irq_regs(regs); |
| |
| /* |
| * NOTE! We'd better ACK the irq immediately, |
| * because timer handling can be slow. |
| */ |
| ack_APIC_irq(); |
| /* |
| * update_process_times() expects us to have done irq_enter(). |
| * Besides, if we don't timer interrupts ignore the global |
| * interrupt lock, which is the WrongThing (tm) to do. |
| */ |
| exit_idle(); |
| irq_enter(); |
| local_apic_timer_interrupt(); |
| irq_exit(); |
| |
| set_irq_regs(old_regs); |
| } |
| |
| int setup_profiling_timer(unsigned int multiplier) |
| { |
| return -EINVAL; |
| } |
| |
| /* |
| * Local APIC start and shutdown |
| */ |
| |
| /** |
| * clear_local_APIC - shutdown the local APIC |
| * |
| * This is called, when a CPU is disabled and before rebooting, so the state of |
| * the local APIC has no dangling leftovers. Also used to cleanout any BIOS |
| * leftovers during boot. |
| */ |
| void clear_local_APIC(void) |
| { |
| int maxlvt; |
| u32 v; |
| |
| /* APIC hasn't been mapped yet */ |
| if (!x2apic && !apic_phys) |
| return; |
| |
| maxlvt = lapic_get_maxlvt(); |
| /* |
| * Masking an LVT entry can trigger a local APIC error |
| * if the vector is zero. Mask LVTERR first to prevent this. |
| */ |
| if (maxlvt >= 3) { |
| v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ |
| apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); |
| } |
| /* |
| * Careful: we have to set masks only first to deassert |
| * any level-triggered sources. |
| */ |
| v = apic_read(APIC_LVTT); |
| apic_write(APIC_LVTT, v | APIC_LVT_MASKED); |
| v = apic_read(APIC_LVT0); |
| apic_write(APIC_LVT0, v | APIC_LVT_MASKED); |
| v = apic_read(APIC_LVT1); |
| apic_write(APIC_LVT1, v | APIC_LVT_MASKED); |
| if (maxlvt >= 4) { |
| v = apic_read(APIC_LVTPC); |
| apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); |
| } |
| |
| /* lets not touch this if we didn't frob it */ |
| #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) |
| if (maxlvt >= 5) { |
| v = apic_read(APIC_LVTTHMR); |
| apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED); |
| } |
| #endif |
| #ifdef CONFIG_X86_MCE_INTEL |
| if (maxlvt >= 6) { |
| v = apic_read(APIC_LVTCMCI); |
| if (!(v & APIC_LVT_MASKED)) |
| apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED); |
| } |
| #endif |
| |
| /* |
| * Clean APIC state for other OSs: |
| */ |
| apic_write(APIC_LVTT, APIC_LVT_MASKED); |
| apic_write(APIC_LVT0, APIC_LVT_MASKED); |
| apic_write(APIC_LVT1, APIC_LVT_MASKED); |
| if (maxlvt >= 3) |
| apic_write(APIC_LVTERR, APIC_LVT_MASKED); |
| if (maxlvt >= 4) |
| apic_write(APIC_LVTPC, APIC_LVT_MASKED); |
| |
| /* Integrated APIC (!82489DX) ? */ |
| if (lapic_is_integrated()) { |
| if (maxlvt > 3) |
| /* Clear ESR due to Pentium errata 3AP and 11AP */ |
| apic_write(APIC_ESR, 0); |
| apic_read(APIC_ESR); |
| } |
| } |
| |
| /** |
| * disable_local_APIC - clear and disable the local APIC |
| */ |
| void disable_local_APIC(void) |
| { |
| unsigned int value; |
| |
| /* APIC hasn't been mapped yet */ |
| if (!apic_phys) |
| return; |
| |
| clear_local_APIC(); |
| |
| /* |
| * Disable APIC (implies clearing of registers |
| * for 82489DX!). |
| */ |
| value = apic_read(APIC_SPIV); |
| value &= ~APIC_SPIV_APIC_ENABLED; |
| apic_write(APIC_SPIV, value); |
| |
| #ifdef CONFIG_X86_32 |
| /* |
| * When LAPIC was disabled by the BIOS and enabled by the kernel, |
| * restore the disabled state. |
| */ |
| if (enabled_via_apicbase) { |
| unsigned int l, h; |
| |
| rdmsr(MSR_IA32_APICBASE, l, h); |
| l &= ~MSR_IA32_APICBASE_ENABLE; |
| wrmsr(MSR_IA32_APICBASE, l, h); |
| } |
| #endif |
| } |
| |
| /* |
| * If Linux enabled the LAPIC against the BIOS default disable it down before |
| * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and |
| * not power-off. Additionally clear all LVT entries before disable_local_APIC |
| * for the case where Linux didn't enable the LAPIC. |
| */ |
| void lapic_shutdown(void) |
| { |
| unsigned long flags; |
| |
| if (!cpu_has_apic) |
| return; |
| |
| local_irq_save(flags); |
| |
| #ifdef CONFIG_X86_32 |
| if (!enabled_via_apicbase) |
| clear_local_APIC(); |
| else |
| #endif |
| disable_local_APIC(); |
| |
| |
| local_irq_restore(flags); |
| } |
| |
| /* |
| * This is to verify that we're looking at a real local APIC. |
| * Check these against your board if the CPUs aren't getting |
| * started for no apparent reason. |
| */ |
| int __init verify_local_APIC(void) |
| { |
| unsigned int reg0, reg1; |
| |
| /* |
| * The version register is read-only in a real APIC. |
| */ |
| reg0 = apic_read(APIC_LVR); |
| apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); |
| apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); |
| reg1 = apic_read(APIC_LVR); |
| apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); |
| |
| /* |
| * The two version reads above should print the same |
| * numbers. If the second one is different, then we |
| * poke at a non-APIC. |
| */ |
| if (reg1 != reg0) |
| return 0; |
| |
| /* |
| * Check if the version looks reasonably. |
| */ |
| reg1 = GET_APIC_VERSION(reg0); |
| if (reg1 == 0x00 || reg1 == 0xff) |
| return 0; |
| reg1 = lapic_get_maxlvt(); |
| if (reg1 < 0x02 || reg1 == 0xff) |
| return 0; |
| |
| /* |
| * The ID register is read/write in a real APIC. |
| */ |
| reg0 = apic_read(APIC_ID); |
| apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); |
| apic_write(APIC_ID, reg0 ^ apic->apic_id_mask); |
| reg1 = apic_read(APIC_ID); |
| apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); |
| apic_write(APIC_ID, reg0); |
| if (reg1 != (reg0 ^ apic->apic_id_mask)) |
| return 0; |
| |
| /* |
| * The next two are just to see if we have sane values. |
| * They're only really relevant if we're in Virtual Wire |
| * compatibility mode, but most boxes are anymore. |
| */ |
| reg0 = apic_read(APIC_LVT0); |
| apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); |
| reg1 = apic_read(APIC_LVT1); |
| apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); |
| |
| return 1; |
| } |
| |
| /** |
| * sync_Arb_IDs - synchronize APIC bus arbitration IDs |
| */ |
| void __init sync_Arb_IDs(void) |
| { |
| /* |
| * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not |
| * needed on AMD. |
| */ |
| if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD) |
| return; |
| |
| /* |
| * Wait for idle. |
| */ |
| apic_wait_icr_idle(); |
| |
| apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); |
| apic_write(APIC_ICR, APIC_DEST_ALLINC | |
| APIC_INT_LEVELTRIG | APIC_DM_INIT); |
| } |
| |
| /* |
| * An initial setup of the virtual wire mode. |
| */ |
| void __init init_bsp_APIC(void) |
| { |
| unsigned int value; |
| |
| /* |
| * Don't do the setup now if we have a SMP BIOS as the |
| * through-I/O-APIC virtual wire mode might be active. |
| */ |
| if (smp_found_config || !cpu_has_apic) |
| return; |
| |
| /* |
| * Do not trust the local APIC being empty at bootup. |
| */ |
| clear_local_APIC(); |
| |
| /* |
| * Enable APIC. |
| */ |
| value = apic_read(APIC_SPIV); |
| value &= ~APIC_VECTOR_MASK; |
| value |= APIC_SPIV_APIC_ENABLED; |
| |
| #ifdef CONFIG_X86_32 |
| /* This bit is reserved on P4/Xeon and should be cleared */ |
| if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && |
| (boot_cpu_data.x86 == 15)) |
| value &= ~APIC_SPIV_FOCUS_DISABLED; |
| else |
| #endif |
| value |= APIC_SPIV_FOCUS_DISABLED; |
| value |= SPURIOUS_APIC_VECTOR; |
| apic_write(APIC_SPIV, value); |
| |
| /* |
| * Set up the virtual wire mode. |
| */ |
| apic_write(APIC_LVT0, APIC_DM_EXTINT); |
| value = APIC_DM_NMI; |
| if (!lapic_is_integrated()) /* 82489DX */ |
| value |= APIC_LVT_LEVEL_TRIGGER; |
| apic_write(APIC_LVT1, value); |
| } |
| |
| static void __cpuinit lapic_setup_esr(void) |
| { |
| unsigned int oldvalue, value, maxlvt; |
| |
| if (!lapic_is_integrated()) { |
| pr_info("No ESR for 82489DX.\n"); |
| return; |
| } |
| |
| if (apic->disable_esr) { |
| /* |
| * Something untraceable is creating bad interrupts on |
| * secondary quads ... for the moment, just leave the |
| * ESR disabled - we can't do anything useful with the |
| * errors anyway - mbligh |
| */ |
| pr_info("Leaving ESR disabled.\n"); |
| return; |
| } |
| |
| maxlvt = lapic_get_maxlvt(); |
| if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
| apic_write(APIC_ESR, 0); |
| oldvalue = apic_read(APIC_ESR); |
| |
| /* enables sending errors */ |
| value = ERROR_APIC_VECTOR; |
| apic_write(APIC_LVTERR, value); |
| |
| /* |
| * spec says clear errors after enabling vector. |
| */ |
| if (maxlvt > 3) |
| apic_write(APIC_ESR, 0); |
| value = apic_read(APIC_ESR); |
| if (value != oldvalue) |
| apic_printk(APIC_VERBOSE, "ESR value before enabling " |
| "vector: 0x%08x after: 0x%08x\n", |
| oldvalue, value); |
| } |
| |
| |
| /** |
| * setup_local_APIC - setup the local APIC |
| */ |
| void __cpuinit setup_local_APIC(void) |
| { |
| unsigned int value; |
| int i, j; |
| |
| if (disable_apic) { |
| arch_disable_smp_support(); |
| return; |
| } |
| |
| #ifdef CONFIG_X86_32 |
| /* Pound the ESR really hard over the head with a big hammer - mbligh */ |
| if (lapic_is_integrated() && apic->disable_esr) { |
| apic_write(APIC_ESR, 0); |
| apic_write(APIC_ESR, 0); |
| apic_write(APIC_ESR, 0); |
| apic_write(APIC_ESR, 0); |
| } |
| #endif |
| |
| preempt_disable(); |
| |
| /* |
| * Double-check whether this APIC is really registered. |
| * This is meaningless in clustered apic mode, so we skip it. |
| */ |
| if (!apic->apic_id_registered()) |
| BUG(); |
| |
| /* |
| * Intel recommends to set DFR, LDR and TPR before enabling |
| * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel |
| * document number 292116). So here it goes... |
| */ |
| apic->init_apic_ldr(); |
| |
| /* |
| * Set Task Priority to 'accept all'. We never change this |
| * later on. |
| */ |
| value = apic_read(APIC_TASKPRI); |
| value &= ~APIC_TPRI_MASK; |
| apic_write(APIC_TASKPRI, value); |
| |
| /* |
| * After a crash, we no longer service the interrupts and a pending |
| * interrupt from previous kernel might still have ISR bit set. |
| * |
| * Most probably by now CPU has serviced that pending interrupt and |
| * it might not have done the ack_APIC_irq() because it thought, |
| * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it |
| * does not clear the ISR bit and cpu thinks it has already serivced |
| * the interrupt. Hence a vector might get locked. It was noticed |
| * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. |
| */ |
| for (i = APIC_ISR_NR - 1; i >= 0; i--) { |
| value = apic_read(APIC_ISR + i*0x10); |
| for (j = 31; j >= 0; j--) { |
| if (value & (1<<j)) |
| ack_APIC_irq(); |
| } |
| } |
| |
| /* |
| * Now that we are all set up, enable the APIC |
| */ |
| value = apic_read(APIC_SPIV); |
| value &= ~APIC_VECTOR_MASK; |
| /* |
| * Enable APIC |
| */ |
| value |= APIC_SPIV_APIC_ENABLED; |
| |
| #ifdef CONFIG_X86_32 |
| /* |
| * Some unknown Intel IO/APIC (or APIC) errata is biting us with |
| * certain networking cards. If high frequency interrupts are |
| * happening on a particular IOAPIC pin, plus the IOAPIC routing |
| * entry is masked/unmasked at a high rate as well then sooner or |
| * later IOAPIC line gets 'stuck', no more interrupts are received |
| * from the device. If focus CPU is disabled then the hang goes |
| * away, oh well :-( |
| * |
| * [ This bug can be reproduced easily with a level-triggered |
| * PCI Ne2000 networking cards and PII/PIII processors, dual |
| * BX chipset. ] |
| */ |
| /* |
| * Actually disabling the focus CPU check just makes the hang less |
| * frequent as it makes the interrupt distributon model be more |
| * like LRU than MRU (the short-term load is more even across CPUs). |
| * See also the comment in end_level_ioapic_irq(). --macro |
| */ |
| |
| /* |
| * - enable focus processor (bit==0) |
| * - 64bit mode always use processor focus |
| * so no need to set it |
| */ |
| value &= ~APIC_SPIV_FOCUS_DISABLED; |
| #endif |
| |
| /* |
| * Set spurious IRQ vector |
| */ |
| value |= SPURIOUS_APIC_VECTOR; |
| apic_write(APIC_SPIV, value); |
| |
| /* |
| * Set up LVT0, LVT1: |
| * |
| * set up through-local-APIC on the BP's LINT0. This is not |
| * strictly necessary in pure symmetric-IO mode, but sometimes |
| * we delegate interrupts to the 8259A. |
| */ |
| /* |
| * TODO: set up through-local-APIC from through-I/O-APIC? --macro |
| */ |
| value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; |
| if (!smp_processor_id() && (pic_mode || !value)) { |
| value = APIC_DM_EXTINT; |
| apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", |
| smp_processor_id()); |
| } else { |
| value = APIC_DM_EXTINT | APIC_LVT_MASKED; |
| apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", |
| smp_processor_id()); |
| } |
| apic_write(APIC_LVT0, value); |
| |
| /* |
| * only the BP should see the LINT1 NMI signal, obviously. |
| */ |
| if (!smp_processor_id()) |
| value = APIC_DM_NMI; |
| else |
| value = APIC_DM_NMI | APIC_LVT_MASKED; |
| if (!lapic_is_integrated()) /* 82489DX */ |
| value |= APIC_LVT_LEVEL_TRIGGER; |
| apic_write(APIC_LVT1, value); |
| |
| preempt_enable(); |
| |
| #ifdef CONFIG_X86_MCE_INTEL |
| /* Recheck CMCI information after local APIC is up on CPU #0 */ |
| if (smp_processor_id() == 0) |
| cmci_recheck(); |
| #endif |
| } |
| |
| void __cpuinit end_local_APIC_setup(void) |
| { |
| lapic_setup_esr(); |
| |
| #ifdef CONFIG_X86_32 |
| { |
| unsigned int value; |
| /* Disable the local apic timer */ |
| value = apic_read(APIC_LVTT); |
| value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); |
| apic_write(APIC_LVTT, value); |
| } |
| #endif |
| |
| setup_apic_nmi_watchdog(NULL); |
| apic_pm_activate(); |
| } |
| |
| #ifdef CONFIG_X86_X2APIC |
| void check_x2apic(void) |
| { |
| if (x2apic_enabled()) { |
| pr_info("x2apic enabled by BIOS, switching to x2apic ops\n"); |
| x2apic_preenabled = x2apic = 1; |
| } |
| } |
| |
| void enable_x2apic(void) |
| { |
| int msr, msr2; |
| |
| if (!x2apic) |
| return; |
| |
| rdmsr(MSR_IA32_APICBASE, msr, msr2); |
| if (!(msr & X2APIC_ENABLE)) { |
| pr_info("Enabling x2apic\n"); |
| wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, 0); |
| } |
| } |
| |
| void __init enable_IR_x2apic(void) |
| { |
| #ifdef CONFIG_INTR_REMAP |
| int ret; |
| unsigned long flags; |
| |
| if (!cpu_has_x2apic) |
| return; |
| |
| if (!x2apic_preenabled && disable_x2apic) { |
| pr_info("Skipped enabling x2apic and Interrupt-remapping " |
| "because of nox2apic\n"); |
| return; |
| } |
| |
| if (x2apic_preenabled && disable_x2apic) |
| panic("Bios already enabled x2apic, can't enforce nox2apic"); |
| |
| if (!x2apic_preenabled && skip_ioapic_setup) { |
| pr_info("Skipped enabling x2apic and Interrupt-remapping " |
| "because of skipping io-apic setup\n"); |
| return; |
| } |
| |
| ret = dmar_table_init(); |
| if (ret) { |
| pr_info("dmar_table_init() failed with %d:\n", ret); |
| |
| if (x2apic_preenabled) |
| panic("x2apic enabled by bios. But IR enabling failed"); |
| else |
| pr_info("Not enabling x2apic,Intr-remapping\n"); |
| return; |
| } |
| |
| ret = save_IO_APIC_setup(); |
| if (ret) { |
| pr_info("Saving IO-APIC state failed: %d\n", ret); |
| goto end; |
| } |
| |
| local_irq_save(flags); |
| mask_IO_APIC_setup(); |
| mask_8259A(); |
| |
| ret = enable_intr_remapping(1); |
| |
| if (ret && x2apic_preenabled) { |
| local_irq_restore(flags); |
| panic("x2apic enabled by bios. But IR enabling failed"); |
| } |
| |
| if (ret) |
| goto end_restore; |
| |
| if (!x2apic) { |
| x2apic = 1; |
| enable_x2apic(); |
| } |
| |
| end_restore: |
| if (ret) |
| /* |
| * IR enabling failed |
| */ |
| restore_IO_APIC_setup(); |
| else |
| reinit_intr_remapped_IO_APIC(x2apic_preenabled); |
| |
| unmask_8259A(); |
| local_irq_restore(flags); |
| |
| end: |
| if (!ret) { |
| if (!x2apic_preenabled) |
| pr_info("Enabled x2apic and interrupt-remapping\n"); |
| else |
| pr_info("Enabled Interrupt-remapping\n"); |
| } else |
| pr_err("Failed to enable Interrupt-remapping and x2apic\n"); |
| #else |
| if (!cpu_has_x2apic) |
| return; |
| |
| if (x2apic_preenabled) |
| panic("x2apic enabled prior OS handover," |
| " enable CONFIG_INTR_REMAP"); |
| |
| pr_info("Enable CONFIG_INTR_REMAP for enabling intr-remapping " |
| " and x2apic\n"); |
| #endif |
| |
| return; |
| } |
| #endif /* CONFIG_X86_X2APIC */ |
| |
| #ifdef CONFIG_X86_64 |
| /* |
| * Detect and enable local APICs on non-SMP boards. |
| * Original code written by Keir Fraser. |
| * On AMD64 we trust the BIOS - if it says no APIC it is likely |
| * not correctly set up (usually the APIC timer won't work etc.) |
| */ |
| static int __init detect_init_APIC(void) |
| { |
| if (!cpu_has_apic) { |
| pr_info("No local APIC present\n"); |
| return -1; |
| } |
| |
| mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; |
| boot_cpu_physical_apicid = 0; |
| return 0; |
| } |
| #else |
| /* |
| * Detect and initialize APIC |
| */ |
| static int __init detect_init_APIC(void) |
| { |
| u32 h, l, features; |
| |
| /* Disabled by kernel option? */ |
| if (disable_apic) |
| return -1; |
| |
| switch (boot_cpu_data.x86_vendor) { |
| case X86_VENDOR_AMD: |
| if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || |
| (boot_cpu_data.x86 >= 15)) |
| break; |
| goto no_apic; |
| case X86_VENDOR_INTEL: |
| if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || |
| (boot_cpu_data.x86 == 5 && cpu_has_apic)) |
| break; |
| goto no_apic; |
| default: |
| goto no_apic; |
| } |
| |
| if (!cpu_has_apic) { |
| /* |
| * Over-ride BIOS and try to enable the local APIC only if |
| * "lapic" specified. |
| */ |
| if (!force_enable_local_apic) { |
| pr_info("Local APIC disabled by BIOS -- " |
| "you can enable it with \"lapic\"\n"); |
| return -1; |
| } |
| /* |
| * Some BIOSes disable the local APIC in the APIC_BASE |
| * MSR. This can only be done in software for Intel P6 or later |
| * and AMD K7 (Model > 1) or later. |
| */ |
| rdmsr(MSR_IA32_APICBASE, l, h); |
| if (!(l & MSR_IA32_APICBASE_ENABLE)) { |
| pr_info("Local APIC disabled by BIOS -- reenabling.\n"); |
| l &= ~MSR_IA32_APICBASE_BASE; |
| l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE; |
| wrmsr(MSR_IA32_APICBASE, l, h); |
| enabled_via_apicbase = 1; |
| } |
| } |
| /* |
| * The APIC feature bit should now be enabled |
| * in `cpuid' |
| */ |
| features = cpuid_edx(1); |
| if (!(features & (1 << X86_FEATURE_APIC))) { |
| pr_warning("Could not enable APIC!\n"); |
| return -1; |
| } |
| set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); |
| mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; |
| |
| /* The BIOS may have set up the APIC at some other address */ |
| rdmsr(MSR_IA32_APICBASE, l, h); |
| if (l & MSR_IA32_APICBASE_ENABLE) |
| mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; |
| |
| pr_info("Found and enabled local APIC!\n"); |
| |
| apic_pm_activate(); |
| |
| return 0; |
| |
| no_apic: |
| pr_info("No local APIC present or hardware disabled\n"); |
| return -1; |
| } |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| void __init early_init_lapic_mapping(void) |
| { |
| unsigned long phys_addr; |
| |
| /* |
| * If no local APIC can be found then go out |
| * : it means there is no mpatable and MADT |
| */ |
| if (!smp_found_config) |
| return; |
| |
| phys_addr = mp_lapic_addr; |
| |
| set_fixmap_nocache(FIX_APIC_BASE, phys_addr); |
| apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", |
| APIC_BASE, phys_addr); |
| |
| /* |
| * Fetch the APIC ID of the BSP in case we have a |
| * default configuration (or the MP table is broken). |
| */ |
| boot_cpu_physical_apicid = read_apic_id(); |
| } |
| #endif |
| |
| /** |
| * init_apic_mappings - initialize APIC mappings |
| */ |
| void __init init_apic_mappings(void) |
| { |
| if (x2apic) { |
| boot_cpu_physical_apicid = read_apic_id(); |
| return; |
| } |
| |
| /* |
| * If no local APIC can be found then set up a fake all |
| * zeroes page to simulate the local APIC and another |
| * one for the IO-APIC. |
| */ |
| if (!smp_found_config && detect_init_APIC()) { |
| apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); |
| apic_phys = __pa(apic_phys); |
| } else |
| apic_phys = mp_lapic_addr; |
| |
| set_fixmap_nocache(FIX_APIC_BASE, apic_phys); |
| apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n", |
| APIC_BASE, apic_phys); |
| |
| /* |
| * Fetch the APIC ID of the BSP in case we have a |
| * default configuration (or the MP table is broken). |
| */ |
| if (boot_cpu_physical_apicid == -1U) |
| boot_cpu_physical_apicid = read_apic_id(); |
| } |
| |
| /* |
| * This initializes the IO-APIC and APIC hardware if this is |
| * a UP kernel. |
| */ |
| int apic_version[MAX_APICS]; |
| |
| int __init APIC_init_uniprocessor(void) |
| { |
| if (disable_apic) { |
| pr_info("Apic disabled\n"); |
| return -1; |
| } |
| #ifdef CONFIG_X86_64 |
| if (!cpu_has_apic) { |
| disable_apic = 1; |
| pr_info("Apic disabled by BIOS\n"); |
| return -1; |
| } |
| #else |
| if (!smp_found_config && !cpu_has_apic) |
| return -1; |
| |
| /* |
| * Complain if the BIOS pretends there is one. |
| */ |
| if (!cpu_has_apic && |
| APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { |
| pr_err("BIOS bug, local APIC 0x%x not detected!...\n", |
| boot_cpu_physical_apicid); |
| clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); |
| return -1; |
| } |
| #endif |
| |
| enable_IR_x2apic(); |
| #ifdef CONFIG_X86_64 |
| default_setup_apic_routing(); |
| #endif |
| |
| verify_local_APIC(); |
| connect_bsp_APIC(); |
| |
| #ifdef CONFIG_X86_64 |
| apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid)); |
| #else |
| /* |
| * Hack: In case of kdump, after a crash, kernel might be booting |
| * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid |
| * might be zero if read from MP tables. Get it from LAPIC. |
| */ |
| # ifdef CONFIG_CRASH_DUMP |
| boot_cpu_physical_apicid = read_apic_id(); |
| # endif |
| #endif |
| physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); |
| setup_local_APIC(); |
| |
| #ifdef CONFIG_X86_IO_APIC |
| /* |
| * Now enable IO-APICs, actually call clear_IO_APIC |
| * We need clear_IO_APIC before enabling error vector |
| */ |
| if (!skip_ioapic_setup && nr_ioapics) |
| enable_IO_APIC(); |
| #endif |
| |
| end_local_APIC_setup(); |
| |
| #ifdef CONFIG_X86_IO_APIC |
| if (smp_found_config && !skip_ioapic_setup && nr_ioapics) |
| setup_IO_APIC(); |
| else { |
| nr_ioapics = 0; |
| localise_nmi_watchdog(); |
| } |
| #else |
| localise_nmi_watchdog(); |
| #endif |
| |
| setup_boot_clock(); |
| #ifdef CONFIG_X86_64 |
| check_nmi_watchdog(); |
| #endif |
| |
| return 0; |
| } |
| |
| /* |
| * Local APIC interrupts |
| */ |
| |
| /* |
| * This interrupt should _never_ happen with our APIC/SMP architecture |
| */ |
| void smp_spurious_interrupt(struct pt_regs *regs) |
| { |
| u32 v; |
| |
| exit_idle(); |
| irq_enter(); |
| /* |
| * Check if this really is a spurious interrupt and ACK it |
| * if it is a vectored one. Just in case... |
| * Spurious interrupts should not be ACKed. |
| */ |
| v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); |
| if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) |
| ack_APIC_irq(); |
| |
| inc_irq_stat(irq_spurious_count); |
| |
| /* see sw-dev-man vol 3, chapter 7.4.13.5 */ |
| pr_info("spurious APIC interrupt on CPU#%d, " |
| "should never happen.\n", smp_processor_id()); |
| irq_exit(); |
| } |
| |
| /* |
| * This interrupt should never happen with our APIC/SMP architecture |
| */ |
| void smp_error_interrupt(struct pt_regs *regs) |
| { |
| u32 v, v1; |
| |
| exit_idle(); |
| irq_enter(); |
| /* First tickle the hardware, only then report what went on. -- REW */ |
| v = apic_read(APIC_ESR); |
| apic_write(APIC_ESR, 0); |
| v1 = apic_read(APIC_ESR); |
| ack_APIC_irq(); |
| atomic_inc(&irq_err_count); |
| |
| /* |
| * Here is what the APIC error bits mean: |
| * 0: Send CS error |
| * 1: Receive CS error |
| * 2: Send accept error |
| * 3: Receive accept error |
| * 4: Reserved |
| * 5: Send illegal vector |
| * 6: Received illegal vector |
| * 7: Illegal register address |
| */ |
| pr_debug("APIC error on CPU%d: %02x(%02x)\n", |
| smp_processor_id(), v , v1); |
| irq_exit(); |
| } |
| |
| /** |
| * connect_bsp_APIC - attach the APIC to the interrupt system |
| */ |
| void __init connect_bsp_APIC(void) |
| { |
| #ifdef CONFIG_X86_32 |
| if (pic_mode) { |
| /* |
| * Do not trust the local APIC being empty at bootup. |
| */ |
| clear_local_APIC(); |
| /* |
| * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's |
| * local APIC to INT and NMI lines. |
| */ |
| apic_printk(APIC_VERBOSE, "leaving PIC mode, " |
| "enabling APIC mode.\n"); |
| outb(0x70, 0x22); |
| outb(0x01, 0x23); |
| } |
| #endif |
| if (apic->enable_apic_mode) |
| apic->enable_apic_mode(); |
| } |
| |
| /** |
| * disconnect_bsp_APIC - detach the APIC from the interrupt system |
| * @virt_wire_setup: indicates, whether virtual wire mode is selected |
| * |
| * Virtual wire mode is necessary to deliver legacy interrupts even when the |
| * APIC is disabled. |
| */ |
| void disconnect_bsp_APIC(int virt_wire_setup) |
| { |
| unsigned int value; |
| |
| #ifdef CONFIG_X86_32 |
| if (pic_mode) { |
| /* |
| * Put the board back into PIC mode (has an effect only on |
| * certain older boards). Note that APIC interrupts, including |
| * IPIs, won't work beyond this point! The only exception are |
| * INIT IPIs. |
| */ |
| apic_printk(APIC_VERBOSE, "disabling APIC mode, " |
| "entering PIC mode.\n"); |
| outb(0x70, 0x22); |
| outb(0x00, 0x23); |
| return; |
| } |
| #endif |
| |
| /* Go back to Virtual Wire compatibility mode */ |
| |
| /* For the spurious interrupt use vector F, and enable it */ |
| value = apic_read(APIC_SPIV); |
| value &= ~APIC_VECTOR_MASK; |
| value |= APIC_SPIV_APIC_ENABLED; |
| value |= 0xf; |
| apic_write(APIC_SPIV, value); |
| |
| if (!virt_wire_setup) { |
| /* |
| * For LVT0 make it edge triggered, active high, |
| * external and enabled |
| */ |
| value = apic_read(APIC_LVT0); |
| value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | |
| APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | |
| APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); |
| value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; |
| value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); |
| apic_write(APIC_LVT0, value); |
| } else { |
| /* Disable LVT0 */ |
| apic_write(APIC_LVT0, APIC_LVT_MASKED); |
| } |
| |
| /* |
| * For LVT1 make it edge triggered, active high, |
| * nmi and enabled |
| */ |
| value = apic_read(APIC_LVT1); |
| value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | |
| APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | |
| APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); |
| value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; |
| value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); |
| apic_write(APIC_LVT1, value); |
| } |
| |
| void __cpuinit generic_processor_info(int apicid, int version) |
| { |
| int cpu; |
| |
| /* |
| * Validate version |
| */ |
| if (version == 0x0) { |
| pr_warning("BIOS bug, APIC version is 0 for CPU#%d! " |
| "fixing up to 0x10. (tell your hw vendor)\n", |
| version); |
| version = 0x10; |
| } |
| apic_version[apicid] = version; |
| |
| if (num_processors >= nr_cpu_ids) { |
| int max = nr_cpu_ids; |
| int thiscpu = max + disabled_cpus; |
| |
| pr_warning( |
| "ACPI: NR_CPUS/possible_cpus limit of %i reached." |
| " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); |
| |
| disabled_cpus++; |
| return; |
| } |
| |
| num_processors++; |
| cpu = cpumask_next_zero(-1, cpu_present_mask); |
| |
| if (version != apic_version[boot_cpu_physical_apicid]) |
| WARN_ONCE(1, |
| "ACPI: apic version mismatch, bootcpu: %x cpu %d: %x\n", |
| apic_version[boot_cpu_physical_apicid], cpu, version); |
| |
| physid_set(apicid, phys_cpu_present_map); |
| if (apicid == boot_cpu_physical_apicid) { |
| /* |
| * x86_bios_cpu_apicid is required to have processors listed |
| * in same order as logical cpu numbers. Hence the first |
| * entry is BSP, and so on. |
| */ |
| cpu = 0; |
| } |
| if (apicid > max_physical_apicid) |
| max_physical_apicid = apicid; |
| |
| #ifdef CONFIG_X86_32 |
| /* |
| * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y |
| * but we need to work other dependencies like SMP_SUSPEND etc |
| * before this can be done without some confusion. |
| * if (CPU_HOTPLUG_ENABLED || num_processors > 8) |
| * - Ashok Raj <ashok.raj@intel.com> |
| */ |
| if (max_physical_apicid >= 8) { |
| switch (boot_cpu_data.x86_vendor) { |
| case X86_VENDOR_INTEL: |
| if (!APIC_XAPIC(version)) { |
| def_to_bigsmp = 0; |
| break; |
| } |
| /* If P4 and above fall through */ |
| case X86_VENDOR_AMD: |
| def_to_bigsmp = 1; |
| } |
| } |
| #endif |
| |
| #if defined(CONFIG_SMP) || defined(CONFIG_X86_64) |
| early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; |
| early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid; |
| #endif |
| |
| set_cpu_possible(cpu, true); |
| set_cpu_present(cpu, true); |
| } |
| |
| int hard_smp_processor_id(void) |
| { |
| return read_apic_id(); |
| } |
| |
| void default_init_apic_ldr(void) |
| { |
| unsigned long val; |
| |
| apic_write(APIC_DFR, APIC_DFR_VALUE); |
| val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; |
| val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); |
| apic_write(APIC_LDR, val); |
| } |
| |
| #ifdef CONFIG_X86_32 |
| int default_apicid_to_node(int logical_apicid) |
| { |
| #ifdef CONFIG_SMP |
| return apicid_2_node[hard_smp_processor_id()]; |
| #else |
| return 0; |
| #endif |
| } |
| #endif |
| |
| /* |
| * Power management |
| */ |
| #ifdef CONFIG_PM |
| |
| static struct { |
| /* |
| * 'active' is true if the local APIC was enabled by us and |
| * not the BIOS; this signifies that we are also responsible |
| * for disabling it before entering apm/acpi suspend |
| */ |
| int active; |
| /* r/w apic fields */ |
| unsigned int apic_id; |
| unsigned int apic_taskpri; |
| unsigned int apic_ldr; |
| unsigned int apic_dfr; |
| unsigned int apic_spiv; |
| unsigned int apic_lvtt; |
| unsigned int apic_lvtpc; |
| unsigned int apic_lvt0; |
| unsigned int apic_lvt1; |
| unsigned int apic_lvterr; |
| unsigned int apic_tmict; |
| unsigned int apic_tdcr; |
| unsigned int apic_thmr; |
| } apic_pm_state; |
| |
| static int lapic_suspend(struct sys_device *dev, pm_message_t state) |
| { |
| unsigned long flags; |
| int maxlvt; |
| |
| if (!apic_pm_state.active) |
| return 0; |
| |
| maxlvt = lapic_get_maxlvt(); |
| |
| apic_pm_state.apic_id = apic_read(APIC_ID); |
| apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); |
| apic_pm_state.apic_ldr = apic_read(APIC_LDR); |
| apic_pm_state.apic_dfr = apic_read(APIC_DFR); |
| apic_pm_state.apic_spiv = apic_read(APIC_SPIV); |
| apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); |
| if (maxlvt >= 4) |
| apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); |
| apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); |
| apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); |
| apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); |
| apic_pm_state.apic_tmict = apic_read(APIC_TMICT); |
| apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); |
| #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) |
| if (maxlvt >= 5) |
| apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); |
| #endif |
| |
| local_irq_save(flags); |
| disable_local_APIC(); |
| local_irq_restore(flags); |
| return 0; |
| } |
| |
| static int lapic_resume(struct sys_device *dev) |
| { |
| unsigned int l, h; |
| unsigned long flags; |
| int maxlvt; |
| |
| if (!apic_pm_state.active) |
| return 0; |
| |
| maxlvt = lapic_get_maxlvt(); |
| |
| local_irq_save(flags); |
| |
| if (x2apic) |
| enable_x2apic(); |
| else { |
| /* |
| * Make sure the APICBASE points to the right address |
| * |
| * FIXME! This will be wrong if we ever support suspend on |
| * SMP! We'll need to do this as part of the CPU restore! |
| */ |
| rdmsr(MSR_IA32_APICBASE, l, h); |
| l &= ~MSR_IA32_APICBASE_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); |
| apic_write(APIC_DFR, apic_pm_state.apic_dfr); |
| apic_write(APIC_LDR, apic_pm_state.apic_ldr); |
| apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); |
| apic_write(APIC_SPIV, apic_pm_state.apic_spiv); |
| apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); |
| apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); |
| #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) |
| if (maxlvt >= 5) |
| apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); |
| #endif |
| if (maxlvt >= 4) |
| apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); |
| apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); |
| apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); |
| apic_write(APIC_TMICT, apic_pm_state.apic_tmict); |
| apic_write(APIC_ESR, 0); |
| apic_read(APIC_ESR); |
| apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); |
| apic_write(APIC_ESR, 0); |
| apic_read(APIC_ESR); |
| |
| local_irq_restore(flags); |
| |
| return 0; |
| } |
| |
| /* |
| * This device has no shutdown method - fully functioning local APICs |
| * are needed on every CPU up until machine_halt/restart/poweroff. |
| */ |
| |
| static struct sysdev_class lapic_sysclass = { |
| .name = "lapic", |
| .resume = lapic_resume, |
| .suspend = lapic_suspend, |
| }; |
| |
| static struct sys_device device_lapic = { |
| .id = 0, |
| .cls = &lapic_sysclass, |
| }; |
| |
| static void __cpuinit apic_pm_activate(void) |
| { |
| apic_pm_state.active = 1; |
| } |
| |
| static int __init init_lapic_sysfs(void) |
| { |
| int error; |
| |
| if (!cpu_has_apic) |
| return 0; |
| /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ |
| |
| error = sysdev_class_register(&lapic_sysclass); |
| if (!error) |
| error = sysdev_register(&device_lapic); |
| return error; |
| } |
| device_initcall(init_lapic_sysfs); |
| |
| #else /* CONFIG_PM */ |
| |
| static void apic_pm_activate(void) { } |
| |
| #endif /* CONFIG_PM */ |
| |
| #ifdef CONFIG_X86_64 |
| /* |
| * apic_is_clustered_box() -- Check if we can expect good TSC |
| * |
| * Thus far, the major user of this is IBM's Summit2 series: |
| * |
| * Clustered boxes may have unsynced TSC problems if they are |
| * multi-chassis. Use available data to take a good guess. |
| * If in doubt, go HPET. |
| */ |
| __cpuinit int apic_is_clustered_box(void) |
| { |
| int i, clusters, zeros; |
| unsigned id; |
| u16 *bios_cpu_apicid; |
| DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); |
| |
| /* |
| * there is not this kind of box with AMD CPU yet. |
| * Some AMD box with quadcore cpu and 8 sockets apicid |
| * will be [4, 0x23] or [8, 0x27] could be thought to |
| * vsmp box still need checking... |
| */ |
| if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && !is_vsmp_box()) |
| return 0; |
| |
| bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid); |
| bitmap_zero(clustermap, NUM_APIC_CLUSTERS); |
| |
| for (i = 0; i < nr_cpu_ids; i++) { |
| /* are we being called early in kernel startup? */ |
| if (bios_cpu_apicid) { |
| id = bios_cpu_apicid[i]; |
| } else if (i < nr_cpu_ids) { |
| if (cpu_present(i)) |
| id = per_cpu(x86_bios_cpu_apicid, i); |
| else |
| continue; |
| } else |
| break; |
| |
| if (id != BAD_APICID) |
| __set_bit(APIC_CLUSTERID(id), clustermap); |
| } |
| |
| /* Problem: Partially populated chassis may not have CPUs in some of |
| * the APIC clusters they have been allocated. Only present CPUs have |
| * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap. |
| * Since clusters are allocated sequentially, count zeros only if |
| * they are bounded by ones. |
| */ |
| clusters = 0; |
| zeros = 0; |
| for (i = 0; i < NUM_APIC_CLUSTERS; i++) { |
| if (test_bit(i, clustermap)) { |
| clusters += 1 + zeros; |
| zeros = 0; |
| } else |
| ++zeros; |
| } |
| |
| /* ScaleMP vSMPowered boxes have one cluster per board and TSCs are |
| * not guaranteed to be synced between boards |
| */ |
| if (is_vsmp_box() && clusters > 1) |
| return 1; |
| |
| /* |
| * If clusters > 2, then should be multi-chassis. |
| * May have to revisit this when multi-core + hyperthreaded CPUs come |
| * out, but AFAIK this will work even for them. |
| */ |
| return (clusters > 2); |
| } |
| #endif |
| |
| /* |
| * APIC command line parameters |
| */ |
| static int __init setup_disableapic(char *arg) |
| { |
| disable_apic = 1; |
| setup_clear_cpu_cap(X86_FEATURE_APIC); |
| return 0; |
| } |
| early_param("disableapic", setup_disableapic); |
| |
| /* same as disableapic, for compatibility */ |
| static int __init setup_nolapic(char *arg) |
| { |
| return setup_disableapic(arg); |
| } |
| early_param("nolapic", setup_nolapic); |
| |
| static int __init parse_lapic_timer_c2_ok(char *arg) |
| { |
| local_apic_timer_c2_ok = 1; |
| return 0; |
| } |
| early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); |
| |
| static int __init parse_disable_apic_timer(char *arg) |
| { |
| disable_apic_timer = 1; |
| return 0; |
| } |
| early_param("noapictimer", parse_disable_apic_timer); |
| |
| static int __init parse_nolapic_timer(char *arg) |
| { |
| disable_apic_timer = 1; |
| return 0; |
| } |
| early_param("nolapic_timer", parse_nolapic_timer); |
| |
| static int __init apic_set_verbosity(char *arg) |
| { |
| if (!arg) { |
| #ifdef CONFIG_X86_64 |
| skip_ioapic_setup = 0; |
| return 0; |
| #endif |
| return -EINVAL; |
| } |
| |
| if (strcmp("debug", arg) == 0) |
| apic_verbosity = APIC_DEBUG; |
| else if (strcmp("verbose", arg) == 0) |
| apic_verbosity = APIC_VERBOSE; |
| else { |
| pr_warning("APIC Verbosity level %s not recognised" |
| " use apic=verbose or apic=debug\n", arg); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| early_param("apic", apic_set_verbosity); |
| |
| static int __init lapic_insert_resource(void) |
| { |
| if (!apic_phys) |
| return -1; |
| |
| /* Put local APIC into the resource map. */ |
| lapic_resource.start = apic_phys; |
| lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1; |
| insert_resource(&iomem_resource, &lapic_resource); |
| |
| return 0; |
| } |
| |
| /* |
| * need call insert after e820_reserve_resources() |
| * that is using request_resource |
| */ |
| late_initcall(lapic_insert_resource); |