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x86/apic: Add TSC_DEADLINE quirk due to errata 

Due to errata it is possible for the TSC_DEADLINE timer to misbehave
after using TSC_ADJUST. A microcode update is available to fix this
situation.

Avoid using the TSC_DEADLINE timer if it is affected by this issue and
report the required microcode version.

[ tglx: Renamed function to apic_check_deadline_errata() ]

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: kevin.b.stanton@intel.com
Link: http://lkml.kernel.org/r/20170531155306.050849877@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Peter Zijlstra 2017-05-31 17:52:03 +02:00 committed by Thomas Gleixner
parent c6e9f42bbe
commit bd9240a18e
1 changed files with 79 additions and 0 deletions
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79
arch/x86/kernel/apic/apic.c
View File

@ -54,6 +54,8 @@
#include <asm/mce.h>
#include <asm/tsc.h>
#include <asm/hypervisor.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
unsigned int num_processors;
@ -545,6 +547,81 @@ static struct clock_event_device lapic_clockevent = {
};
static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
#define DEADLINE_MODEL_MATCH_FUNC(model, func) \
{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&func }
#define DEADLINE_MODEL_MATCH_REV(model, rev) \
{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)rev }
static u32 hsx_deadline_rev(void)
{
switch (boot_cpu_data.x86_mask) {
case 0x02: return 0x3a; /* EP */
case 0x04: return 0x0f; /* EX */
}
return ~0U;
}
static u32 bdx_deadline_rev(void)
{
switch (boot_cpu_data.x86_mask) {
case 0x02: return 0x00000011;
case 0x03: return 0x0700000e;
case 0x04: return 0x0f00000c;
case 0x05: return 0x0e000003;
}
return ~0U;
}
static const struct x86_cpu_id deadline_match[] = {
DEADLINE_MODEL_MATCH_FUNC( INTEL_FAM6_HASWELL_X, hsx_deadline_rev),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_BROADWELL_X, 0x0b000020),
DEADLINE_MODEL_MATCH_FUNC( INTEL_FAM6_BROADWELL_XEON_D, bdx_deadline_rev),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_SKYLAKE_X, 0x02000014),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_HASWELL_CORE, 0x22),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_HASWELL_ULT, 0x20),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_HASWELL_GT3E, 0x17),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_BROADWELL_CORE, 0x25),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_BROADWELL_GT3E, 0x17),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_SKYLAKE_MOBILE, 0xb2),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_SKYLAKE_DESKTOP, 0xb2),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_KABYLAKE_MOBILE, 0x52),
DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_KABYLAKE_DESKTOP, 0x52),
{},
};
static void apic_check_deadline_errata(void)
{
const struct x86_cpu_id *m = x86_match_cpu(deadline_match);
u32 rev;
if (!m)
return;
/*
* Function pointers will have the MSB set due to address layout,
* immediate revisions will not.
*/
if ((long)m->driver_data < 0)
rev = ((u32 (*)(void))(m->driver_data))();
else
rev = (u32)m->driver_data;
if (boot_cpu_data.microcode >= rev)
return;
setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
pr_err(FW_BUG "TSC_DEADLINE disabled due to Errata; "
"please update microcode to version: 0x%x (or later)\n", rev);
}
/*
* Setup the local APIC timer for this CPU. Copy the initialized values
* of the boot CPU and register the clock event in the framework.
@ -1780,6 +1857,8 @@ void __init init_apic_mappings(void)
{
unsigned int new_apicid;
apic_check_deadline_errata();
if (x2apic_mode) {
boot_cpu_physical_apicid = read_apic_id();
return;