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    Subject[PATCH] x86/apic: Handle missing global clockevent gracefully
    Some newer machines do not advertise legacy timers. The kernel can handle
    that situation if the TSC and the CPU frequency are enumerated by CPUID or
    MSRs and the CPU supports TSC deadline timer. If the CPU does not support
    TSC deadline timer the local APIC timer frequency has to be known as well.

    Some Ryzens machines do not advertize legacy timers, but there is no
    reliable way to determine the bus frequency which feeds the local APIC
    timer when the machine allows overclocking of that frequency.

    As there is no legacy timer the local APIC timer calibration crashes due to
    a NULL pointer dereference when accessing the not installed global clock
    event device.

    Switch the calibration loop to a non interrupt based one, which polls
    either TSC (frequency known) or jiffies. The latter requires a global
    clockevent. As the machines which do not have a global clockevent installed
    have a known TSC frequency this is a non issue. For older machines where
    TSC frequency is not known, there is no known case where the legacy timers
    do not exist as that would have been reported long ago.

    Reported-by: Daniel Drake <drake@endlessm.com>
    Reported-by: Jiri Slaby <jslaby@suse.cz>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    ---

    Note: Only lightly tested, but of course not on an affected machine.

    If that works reliably, then this needs some exhaustive testing
    on a wide range of systems so we can risk backports to stable
    kernels.

    ---
    arch/x86/kernel/apic/apic.c | 70 +++++++++++++++++++++++++++++++++-----------
    include/linux/acpi_pmtmr.h | 10 ++++++
    2 files changed, 64 insertions(+), 16 deletions(-)

    --- a/arch/x86/kernel/apic/apic.c
    +++ b/arch/x86/kernel/apic/apic.c
    @@ -851,7 +851,8 @@ bool __init apic_needs_pit(void)
    static int __init calibrate_APIC_clock(void)
    {
    struct clock_event_device *levt = this_cpu_ptr(&lapic_events);
    - void (*real_handler)(struct clock_event_device *dev);
    + u64 tsc_perj = 0, tsc_start = 0;
    + unsigned long jif_start;
    unsigned long deltaj;
    long delta, deltatsc;
    int pm_referenced = 0;
    @@ -878,29 +879,65 @@ static int __init calibrate_APIC_clock(v
    apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"
    "calibrating APIC timer ...\n");

    - local_irq_disable();
    -
    - /* Replace the global interrupt handler */
    - real_handler = global_clock_event->event_handler;
    - global_clock_event->event_handler = lapic_cal_handler;
    + /*
    + * There are platforms w/o global clockevent devices. Instead of
    + * making the calibration conditional on that, use a polling based
    + * approach everywhere.
    + */

    + local_irq_disable();
    /*
    * 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();
    + /*
    + * Methods to terminate the calibration loop:
    + * 1) Global clockevent if available (jiffies)
    + * 2) TSC if available and frequency is known
    + */
    + jif_start = READ_ONCE(jiffies);
    +
    + if (tsc_khz) {
    + tsc_start = rdtsc();
    + tsc_perj = div_u64((u64)tsc_khz * 1000, HZ);
    + }
    +
    + while (lapic_cal_loops <= LAPIC_CAL_LOOPS) {
    + /*
    + * Enable interrupts so the tick can fire, if a global
    + * clockevent device is available
    + */
    + local_irq_enable();

    - while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
    - cpu_relax();
    + /* Wait for a tick to elapse */
    + while (1) {
    + if (tsc_khz) {
    + u64 tsc_now = rdtsc();
    + if ((tsc_now - tsc_start) >= tsc_perj) {
    + tsc_start += tsc_perj;
    + break;
    + }
    + } else {
    + unsigned long jif_now = READ_ONCE(jiffies);
    +
    + if (time_after(jif_now, jif_start)) {
    + jif_start = jif_now;
    + break;
    + }
    + }
    + cpu_relax();
    + }
    +
    + /* Invoke the calibration routine */
    + local_irq_disable();
    + lapic_cal_handler(NULL);
    + local_irq_enable();
    + }

    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);
    @@ -943,10 +980,11 @@ static int __init calibrate_APIC_clock(v
    levt->features &= ~CLOCK_EVT_FEAT_DUMMY;

    /*
    - * PM timer calibration failed or not turned on
    - * so lets try APIC timer based calibration
    + * PM timer calibration failed or not turned on so lets try APIC
    + * timer based calibration, if a global clockevent device is
    + * available.
    */
    - if (!pm_referenced) {
    + if (!pm_referenced && global_clock_event) {
    apic_printk(APIC_VERBOSE, "... verify APIC timer\n");

    /*
    --- a/include/linux/acpi_pmtmr.h
    +++ b/include/linux/acpi_pmtmr.h
    @@ -18,6 +18,11 @@
    extern u32 acpi_pm_read_verified(void);
    extern u32 pmtmr_ioport;

    +static inline bool acpi_pm_timer_available(void)
    +{
    + return pmtmr_ioport != 0;
    +}
    +
    static inline u32 acpi_pm_read_early(void)
    {
    if (!pmtmr_ioport)
    @@ -28,6 +33,11 @@ static inline u32 acpi_pm_read_early(voi

    #else

    +static inline bool acpi_pm_timer_available(void)
    +{
    + return false;
    +}
    +
    static inline u32 acpi_pm_read_early(void)
    {
    return 0;
    \
     
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