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-rw-r--r--Documentation/admin-guide/kernel-parameters.txt2
-rw-r--r--Documentation/x86/x86_64/boot-options.txt4
-rw-r--r--arch/arm/include/asm/mach/time.h3
-rw-r--r--arch/arm/kernel/time.c15
-rw-r--r--arch/arm/plat-omap/counter_32k.c2
-rw-r--r--arch/s390/kernel/time.c15
-rw-r--r--arch/x86/include/asm/intel-family.h13
-rw-r--r--arch/x86/include/asm/intel-mid.h43
-rw-r--r--arch/x86/include/asm/kvm_guest.h7
-rw-r--r--arch/x86/include/asm/kvm_para.h1
-rw-r--r--arch/x86/include/asm/text-patching.h1
-rw-r--r--arch/x86/include/asm/tsc.h4
-rw-r--r--arch/x86/kernel/alternative.c7
-rw-r--r--arch/x86/kernel/cpu/amd.c13
-rw-r--r--arch/x86/kernel/cpu/common.c40
-rw-r--r--arch/x86/kernel/jump_label.c11
-rw-r--r--arch/x86/kernel/kvm.c14
-rw-r--r--arch/x86/kernel/kvmclock.c258
-rw-r--r--arch/x86/kernel/setup.c10
-rw-r--r--arch/x86/kernel/tsc.c259
-rw-r--r--arch/x86/kernel/tsc_msr.c96
-rw-r--r--arch/x86/kernel/x86_init.c2
-rw-r--r--arch/x86/platform/intel-mid/Makefile2
-rw-r--r--arch/x86/platform/intel-mid/intel-mid.c23
-rw-r--r--arch/x86/platform/intel-mid/intel_mid_weak_decls.h18
-rw-r--r--arch/x86/platform/intel-mid/mfld.c70
-rw-r--r--arch/x86/platform/intel-mid/mrfld.c105
-rw-r--r--arch/x86/xen/enlighten_pv.c51
-rw-r--r--arch/x86/xen/mmu_pv.c6
-rw-r--r--arch/x86/xen/suspend_pv.c5
-rw-r--r--arch/x86/xen/time.c18
-rw-r--r--arch/x86/xen/xen-ops.h6
-rw-r--r--drivers/clocksource/tegra20_timer.c2
-rw-r--r--include/linux/sched_clock.h5
-rw-r--r--include/linux/timekeeping.h3
-rw-r--r--init/main.c4
-rw-r--r--kernel/sched/clock.c57
-rw-r--r--kernel/sched/core.c1
-rw-r--r--kernel/sched/debug.c2
-rw-r--r--kernel/time/sched_clock.c2
-rw-r--r--kernel/time/timekeeping.c62
41 files changed, 508 insertions, 754 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index c370f5f0eb38..5cde1ff32ff3 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2835,8 +2835,6 @@
nosync [HW,M68K] Disables sync negotiation for all devices.
- notsc [BUGS=X86-32] Disable Time Stamp Counter
-
nowatchdog [KNL] Disable both lockup detectors, i.e.
soft-lockup and NMI watchdog (hard-lockup).
diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index 3a2ba436721a..ad6d2a80cf05 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -92,9 +92,7 @@ APICs
Timing
notsc
- Don't use the CPU time stamp counter to read the wall time.
- This can be used to work around timing problems on multiprocessor systems
- with not properly synchronized CPUs.
+ Deprecated, use tsc=unstable instead.
nohpet
Don't use the HPET timer.
diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index 0f79e4dec7f9..4ac3a019a46f 100644
--- a/arch/arm/include/asm/mach/time.h
+++ b/arch/arm/include/asm/mach/time.h
@@ -13,7 +13,6 @@
extern void timer_tick(void);
typedef void (*clock_access_fn)(struct timespec64 *);
-extern int register_persistent_clock(clock_access_fn read_boot,
- clock_access_fn read_persistent);
+extern int register_persistent_clock(clock_access_fn read_persistent);
#endif
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index cf2701cb0de8..078b259ead4e 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -83,29 +83,18 @@ static void dummy_clock_access(struct timespec64 *ts)
}
static clock_access_fn __read_persistent_clock = dummy_clock_access;
-static clock_access_fn __read_boot_clock = dummy_clock_access;
void read_persistent_clock64(struct timespec64 *ts)
{
__read_persistent_clock(ts);
}
-void read_boot_clock64(struct timespec64 *ts)
-{
- __read_boot_clock(ts);
-}
-
-int __init register_persistent_clock(clock_access_fn read_boot,
- clock_access_fn read_persistent)
+int __init register_persistent_clock(clock_access_fn read_persistent)
{
/* Only allow the clockaccess functions to be registered once */
- if (__read_persistent_clock == dummy_clock_access &&
- __read_boot_clock == dummy_clock_access) {
- if (read_boot)
- __read_boot_clock = read_boot;
+ if (__read_persistent_clock == dummy_clock_access) {
if (read_persistent)
__read_persistent_clock = read_persistent;
-
return 0;
}
diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index 2438b96004c1..fcc5bfec8bd1 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -110,7 +110,7 @@ int __init omap_init_clocksource_32k(void __iomem *vbase)
}
sched_clock_register(omap_32k_read_sched_clock, 32, 32768);
- register_persistent_clock(NULL, omap_read_persistent_clock64);
+ register_persistent_clock(omap_read_persistent_clock64);
pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n");
return 0;
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index cf561160ea88..e8766beee5ad 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -221,17 +221,22 @@ void read_persistent_clock64(struct timespec64 *ts)
ext_to_timespec64(clk, ts);
}
-void read_boot_clock64(struct timespec64 *ts)
+void __init read_persistent_wall_and_boot_offset(struct timespec64 *wall_time,
+ struct timespec64 *boot_offset)
{
unsigned char clk[STORE_CLOCK_EXT_SIZE];
+ struct timespec64 boot_time;
__u64 delta;
delta = initial_leap_seconds + TOD_UNIX_EPOCH;
- memcpy(clk, tod_clock_base, 16);
- *(__u64 *) &clk[1] -= delta;
- if (*(__u64 *) &clk[1] > delta)
+ memcpy(clk, tod_clock_base, STORE_CLOCK_EXT_SIZE);
+ *(__u64 *)&clk[1] -= delta;
+ if (*(__u64 *)&clk[1] > delta)
clk[0]--;
- ext_to_timespec64(clk, ts);
+ ext_to_timespec64(clk, &boot_time);
+
+ read_persistent_clock64(wall_time);
+ *boot_offset = timespec64_sub(*wall_time, boot_time);
}
static u64 read_tod_clock(struct clocksource *cs)
diff --git a/arch/x86/include/asm/intel-family.h b/arch/x86/include/asm/intel-family.h
index cf090e584202..7ed08a7c3398 100644
--- a/arch/x86/include/asm/intel-family.h
+++ b/arch/x86/include/asm/intel-family.h
@@ -76,4 +76,17 @@
#define INTEL_FAM6_XEON_PHI_KNL 0x57 /* Knights Landing */
#define INTEL_FAM6_XEON_PHI_KNM 0x85 /* Knights Mill */
+/* Useful macros */
+#define INTEL_CPU_FAM_ANY(_family, _model, _driver_data) \
+{ \
+ .vendor = X86_VENDOR_INTEL, \
+ .family = _family, \
+ .model = _model, \
+ .feature = X86_FEATURE_ANY, \
+ .driver_data = (kernel_ulong_t)&_driver_data \
+}
+
+#define INTEL_CPU_FAM6(_model, _driver_data) \
+ INTEL_CPU_FAM_ANY(6, INTEL_FAM6_##_model, _driver_data)
+
#endif /* _ASM_X86_INTEL_FAMILY_H */
diff --git a/arch/x86/include/asm/intel-mid.h b/arch/x86/include/asm/intel-mid.h
index fe04491130ae..52f815a80539 100644
--- a/arch/x86/include/asm/intel-mid.h
+++ b/arch/x86/include/asm/intel-mid.h
@@ -80,35 +80,6 @@ enum intel_mid_cpu_type {
extern enum intel_mid_cpu_type __intel_mid_cpu_chip;
-/**
- * struct intel_mid_ops - Interface between intel-mid & sub archs
- * @arch_setup: arch_setup function to re-initialize platform
- * structures (x86_init, x86_platform_init)
- *
- * This structure can be extended if any new interface is required
- * between intel-mid & its sub arch files.
- */
-struct intel_mid_ops {
- void (*arch_setup)(void);
-};
-
-/* Helper API's for INTEL_MID_OPS_INIT */
-#define DECLARE_INTEL_MID_OPS_INIT(cpuname, cpuid) \
- [cpuid] = get_##cpuname##_ops
-
-/* Maximum number of CPU ops */
-#define MAX_CPU_OPS(a) (sizeof(a)/sizeof(void *))
-
-/*
- * For every new cpu addition, a weak get_<cpuname>_ops() function needs be
- * declared in arch/x86/platform/intel_mid/intel_mid_weak_decls.h.
- */
-#define INTEL_MID_OPS_INIT { \
- DECLARE_INTEL_MID_OPS_INIT(penwell, INTEL_MID_CPU_CHIP_PENWELL), \
- DECLARE_INTEL_MID_OPS_INIT(cloverview, INTEL_MID_CPU_CHIP_CLOVERVIEW), \
- DECLARE_INTEL_MID_OPS_INIT(tangier, INTEL_MID_CPU_CHIP_TANGIER) \
-};
-
#ifdef CONFIG_X86_INTEL_MID
static inline enum intel_mid_cpu_type intel_mid_identify_cpu(void)
@@ -136,20 +107,6 @@ enum intel_mid_timer_options {
extern enum intel_mid_timer_options intel_mid_timer_options;
-/*
- * Penwell uses spread spectrum clock, so the freq number is not exactly
- * the same as reported by MSR based on SDM.
- */
-#define FSB_FREQ_83SKU 83200
-#define FSB_FREQ_100SKU 99840
-#define FSB_FREQ_133SKU 133000
-
-#define FSB_FREQ_167SKU 167000
-#define FSB_FREQ_200SKU 200000
-#define FSB_FREQ_267SKU 267000
-#define FSB_FREQ_333SKU 333000
-#define FSB_FREQ_400SKU 400000
-
/* Bus Select SoC Fuse value */
#define BSEL_SOC_FUSE_MASK 0x7
/* FSB 133MHz */
diff --git a/arch/x86/include/asm/kvm_guest.h b/arch/x86/include/asm/kvm_guest.h
deleted file mode 100644
index 46185263d9c2..000000000000
--- a/arch/x86/include/asm/kvm_guest.h
+++ /dev/null
@@ -1,7 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_KVM_GUEST_H
-#define _ASM_X86_KVM_GUEST_H
-
-int kvm_setup_vsyscall_timeinfo(void);
-
-#endif /* _ASM_X86_KVM_GUEST_H */
diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 3aea2658323a..4c723632c036 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -7,7 +7,6 @@
#include <uapi/asm/kvm_para.h>
extern void kvmclock_init(void);
-extern int kvm_register_clock(char *txt);
#ifdef CONFIG_KVM_GUEST
bool kvm_check_and_clear_guest_paused(void);
diff --git a/arch/x86/include/asm/text-patching.h b/arch/x86/include/asm/text-patching.h
index 2ecd34e2d46c..e85ff65c43c3 100644
--- a/arch/x86/include/asm/text-patching.h
+++ b/arch/x86/include/asm/text-patching.h
@@ -37,5 +37,6 @@ extern void *text_poke_early(void *addr, const void *opcode, size_t len);
extern void *text_poke(void *addr, const void *opcode, size_t len);
extern int poke_int3_handler(struct pt_regs *regs);
extern void *text_poke_bp(void *addr, const void *opcode, size_t len, void *handler);
+extern int after_bootmem;
#endif /* _ASM_X86_TEXT_PATCHING_H */
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index 2701d221583a..eb5bbfeccb66 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -33,13 +33,13 @@ static inline cycles_t get_cycles(void)
extern struct system_counterval_t convert_art_to_tsc(u64 art);
extern struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns);
-extern void tsc_early_delay_calibrate(void);
+extern void tsc_early_init(void);
extern void tsc_init(void);
extern void mark_tsc_unstable(char *reason);
extern int unsynchronized_tsc(void);
extern int check_tsc_unstable(void);
extern void mark_tsc_async_resets(char *reason);
-extern unsigned long native_calibrate_cpu(void);
+extern unsigned long native_calibrate_cpu_early(void);
extern unsigned long native_calibrate_tsc(void);
extern unsigned long long native_sched_clock_from_tsc(u64 tsc);
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index a481763a3776..014f214da581 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -668,6 +668,7 @@ void *__init_or_module text_poke_early(void *addr, const void *opcode,
local_irq_save(flags);
memcpy(addr, opcode, len);
local_irq_restore(flags);
+ sync_core();
/* Could also do a CLFLUSH here to speed up CPU recovery; but
that causes hangs on some VIA CPUs. */
return addr;
@@ -693,6 +694,12 @@ void *text_poke(void *addr, const void *opcode, size_t len)
struct page *pages[2];
int i;
+ /*
+ * While boot memory allocator is runnig we cannot use struct
+ * pages as they are not yet initialized.
+ */
+ BUG_ON(!after_bootmem);
+
if (!core_kernel_text((unsigned long)addr)) {
pages[0] = vmalloc_to_page(addr);
pages[1] = vmalloc_to_page(addr + PAGE_SIZE);
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 38915fbfae73..b732438c1a1e 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -232,8 +232,6 @@ static void init_amd_k7(struct cpuinfo_x86 *c)
}
}
- set_cpu_cap(c, X86_FEATURE_K7);
-
/* calling is from identify_secondary_cpu() ? */
if (!c->cpu_index)
return;
@@ -617,6 +615,14 @@ static void early_init_amd(struct cpuinfo_x86 *c)
early_init_amd_mc(c);
+#ifdef CONFIG_X86_32
+ if (c->x86 == 6)
+ set_cpu_cap(c, X86_FEATURE_K7);
+#endif
+
+ if (c->x86 >= 0xf)
+ set_cpu_cap(c, X86_FEATURE_K8);
+
rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
/*
@@ -863,9 +869,6 @@ static void init_amd(struct cpuinfo_x86 *c)
init_amd_cacheinfo(c);
- if (c->x86 >= 0xf)
- set_cpu_cap(c, X86_FEATURE_K8);
-
if (cpu_has(c, X86_FEATURE_XMM2)) {
unsigned long long val;
int ret;
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index df28e931d732..ba6b8bb1c036 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1019,6 +1019,24 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
}
/*
+ * The NOPL instruction is supposed to exist on all CPUs of family >= 6;
+ * unfortunately, that's not true in practice because of early VIA
+ * chips and (more importantly) broken virtualizers that are not easy
+ * to detect. In the latter case it doesn't even *fail* reliably, so
+ * probing for it doesn't even work. Disable it completely on 32-bit
+ * unless we can find a reliable way to detect all the broken cases.
+ * Enable it explicitly on 64-bit for non-constant inputs of cpu_has().
+ */
+static void detect_nopl(void)
+{
+#ifdef CONFIG_X86_32
+ setup_clear_cpu_cap(X86_FEATURE_NOPL);
+#else
+ setup_force_cpu_cap(X86_FEATURE_NOPL);
+#endif
+}
+
+/*
* Do minimum CPU detection early.
* Fields really needed: vendor, cpuid_level, family, model, mask,
* cache alignment.
@@ -1092,6 +1110,8 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
*/
if (!pgtable_l5_enabled())
setup_clear_cpu_cap(X86_FEATURE_LA57);
+
+ detect_nopl();
}
void __init early_cpu_init(void)
@@ -1127,24 +1147,6 @@ void __init early_cpu_init(void)
early_identify_cpu(&boot_cpu_data);
}
-/*
- * The NOPL instruction is supposed to exist on all CPUs of family >= 6;
- * unfortunately, that's not true in practice because of early VIA
- * chips and (more importantly) broken virtualizers that are not easy
- * to detect. In the latter case it doesn't even *fail* reliably, so
- * probing for it doesn't even work. Disable it completely on 32-bit
- * unless we can find a reliable way to detect all the broken cases.
- * Enable it explicitly on 64-bit for non-constant inputs of cpu_has().
- */
-static void detect_nopl(struct cpuinfo_x86 *c)
-{
-#ifdef CONFIG_X86_32
- clear_cpu_cap(c, X86_FEATURE_NOPL);
-#else
- set_cpu_cap(c, X86_FEATURE_NOPL);
-#endif
-}
-
static void detect_null_seg_behavior(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_X86_64
@@ -1207,8 +1209,6 @@ static void generic_identify(struct cpuinfo_x86 *c)
get_model_name(c); /* Default name */
- detect_nopl(c);
-
detect_null_seg_behavior(c);
/*
diff --git a/arch/x86/kernel/jump_label.c b/arch/x86/kernel/jump_label.c
index e56c95be2808..eeea935e9bb5 100644
--- a/arch/x86/kernel/jump_label.c
+++ b/arch/x86/kernel/jump_label.c
@@ -37,15 +37,18 @@ static void bug_at(unsigned char *ip, int line)
BUG();
}
-static void __jump_label_transform(struct jump_entry *entry,
- enum jump_label_type type,
- void *(*poker)(void *, const void *, size_t),
- int init)
+static void __ref __jump_label_transform(struct jump_entry *entry,
+ enum jump_label_type type,
+ void *(*poker)(void *, const void *, size_t),
+ int init)
{
union jump_code_union code;
const unsigned char default_nop[] = { STATIC_KEY_INIT_NOP };
const unsigned char *ideal_nop = ideal_nops[NOP_ATOMIC5];
+ if (early_boot_irqs_disabled)
+ poker = text_poke_early;
+
if (type == JUMP_LABEL_JMP) {
if (init) {
/*
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index a37bda38d205..09aaabb2bbf1 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -45,7 +45,6 @@
#include <asm/apic.h>
#include <asm/apicdef.h>
#include <asm/hypervisor.h>
-#include <asm/kvm_guest.h>
static int kvmapf = 1;
@@ -66,15 +65,6 @@ static int __init parse_no_stealacc(char *arg)
early_param("no-steal-acc", parse_no_stealacc);
-static int kvmclock_vsyscall = 1;
-static int __init parse_no_kvmclock_vsyscall(char *arg)
-{
- kvmclock_vsyscall = 0;
- return 0;
-}
-
-early_param("no-kvmclock-vsyscall", parse_no_kvmclock_vsyscall);
-
static DEFINE_PER_CPU_DECRYPTED(struct kvm_vcpu_pv_apf_data, apf_reason) __aligned(64);
static DEFINE_PER_CPU_DECRYPTED(struct kvm_steal_time, steal_time) __aligned(64);
static int has_steal_clock = 0;
@@ -560,9 +550,6 @@ static void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_PV_EOI))
apic_set_eoi_write(kvm_guest_apic_eoi_write);
- if (kvmclock_vsyscall)
- kvm_setup_vsyscall_timeinfo();
-
#ifdef CONFIG_SMP
smp_ops.smp_prepare_cpus = kvm_smp_prepare_cpus;
smp_ops.smp_prepare_boot_cpu = kvm_smp_prepare_boot_cpu;
@@ -628,6 +615,7 @@ const __initconst struct hypervisor_x86 x86_hyper_kvm = {
.name = "KVM",
.detect = kvm_detect,
.type = X86_HYPER_KVM,
+ .init.init_platform = kvmclock_init,
.init.guest_late_init = kvm_guest_init,
.init.x2apic_available = kvm_para_available,
};
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 3b8e7c13c614..d2edd7e6c294 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -23,30 +23,56 @@
#include <asm/apic.h>
#include <linux/percpu.h>
#include <linux/hardirq.h>
-#include <linux/memblock.h>
+#include <linux/cpuhotplug.h>
#include <linux/sched.h>
#include <linux/sched/clock.h>
+#include <linux/mm.h>
+#include <asm/hypervisor.h>
#include <asm/mem_encrypt.h>
#include <asm/x86_init.h>
#include <asm/reboot.h>
#include <asm/kvmclock.h>
-static int kvmclock __ro_after_init = 1;
-static int msr_kvm_system_time = MSR_KVM_SYSTEM_TIME;
-static int msr_kvm_wall_clock = MSR_KVM_WALL_CLOCK;
-static u64 kvm_sched_clock_offset;
+static int kvmclock __initdata = 1;
+static int kvmclock_vsyscall __initdata = 1;
+static int msr_kvm_system_time __ro_after_init = MSR_KVM_SYSTEM_TIME;
+static int msr_kvm_wall_clock __ro_after_init = MSR_KVM_WALL_CLOCK;
+static u64 kvm_sched_clock_offset __ro_after_init;
-static int parse_no_kvmclock(char *arg)
+static int __init parse_no_kvmclock(char *arg)
{
kvmclock = 0;
return 0;
}
early_param("no-kvmclock", parse_no_kvmclock);
-/* The hypervisor will put information about time periodically here */
-static struct pvclock_vsyscall_time_info *hv_clock;
-static struct pvclock_wall_clock *wall_clock;
+static int __init parse_no_kvmclock_vsyscall(char *arg)
+{
+ kvmclock_vsyscall = 0;
+ return 0;
+}
+early_param("no-kvmclock-vsyscall", parse_no_kvmclock_vsyscall);
+
+/* Aligned to page sizes to match whats mapped via vsyscalls to userspace */
+#define HV_CLOCK_SIZE (sizeof(struct pvclock_vsyscall_time_info) * NR_CPUS)
+#define HVC_BOOT_ARRAY_SIZE \
+ (PAGE_SIZE / sizeof(struct pvclock_vsyscall_time_info))
+
+static struct pvclock_vsyscall_time_info
+ hv_clock_boot[HVC_BOOT_ARRAY_SIZE] __aligned(PAGE_SIZE);
+static struct pvclock_wall_clock wall_clock;
+static DEFINE_PER_CPU(struct pvclock_vsyscall_time_info *, hv_clock_per_cpu);
+
+static inline struct pvclock_vcpu_time_info *this_cpu_pvti(void)
+{
+ return &this_cpu_read(hv_clock_per_cpu)->pvti;
+}
+
+static inline struct pvclock_vsyscall_time_info *this_cpu_hvclock(void)
+{
+ return this_cpu_read(hv_clock_per_cpu);
+}
/*
* The wallclock is the time of day when we booted. Since then, some time may
@@ -55,21 +81,10 @@ static struct pvclock_wall_clock *wall_clock;
*/
static void kvm_get_wallclock(struct timespec64 *now)
{
- struct pvclock_vcpu_time_info *vcpu_time;
- int low, high;
- int cpu;
-
- low = (int)slow_virt_to_phys(wall_clock);
- high = ((u64)slow_virt_to_phys(wall_clock) >> 32);
-
- native_write_msr(msr_kvm_wall_clock, low, high);
-
- cpu = get_cpu();
-
- vcpu_time = &hv_clock[cpu].pvti;
- pvclock_read_wallclock(wall_clock, vcpu_time, now);
-
- put_cpu();
+ wrmsrl(msr_kvm_wall_clock, slow_virt_to_phys(&wall_clock));
+ preempt_disable();
+ pvclock_read_wallclock(&wall_clock, this_cpu_pvti(), now);
+ preempt_enable();
}
static int kvm_set_wallclock(const struct timespec64 *now)
@@ -79,14 +94,10 @@ static int kvm_set_wallclock(const struct timespec64 *now)
static u64 kvm_clock_read(void)
{
- struct pvclock_vcpu_time_info *src;
u64 ret;
- int cpu;
preempt_disable_notrace();
- cpu = smp_processor_id();
- src = &hv_clock[cpu].pvti;
- ret = pvclock_clocksource_read(src);
+ ret = pvclock_clocksource_read(this_cpu_pvti());
preempt_enable_notrace();
return ret;
}
@@ -112,11 +123,11 @@ static inline void kvm_sched_clock_init(bool stable)
kvm_sched_clock_offset = kvm_clock_read();
pv_time_ops.sched_clock = kvm_sched_clock_read;
- printk(KERN_INFO "kvm-clock: using sched offset of %llu cycles\n",
- kvm_sched_clock_offset);
+ pr_info("kvm-clock: using sched offset of %llu cycles",
+ kvm_sched_clock_offset);
BUILD_BUG_ON(sizeof(kvm_sched_clock_offset) >
- sizeof(((struct pvclock_vcpu_time_info *)NULL)->system_time));
+ sizeof(((struct pvclock_vcpu_time_info *)NULL)->system_time));
}
/*
@@ -130,19 +141,11 @@ static inline void kvm_sched_clock_init(bool stable)
*/
static unsigned long kvm_get_tsc_khz(void)
{
- struct pvclock_vcpu_time_info *src;
- int cpu;
- unsigned long tsc_khz;
-
- cpu = get_cpu();
- src = &hv_clock[cpu].pvti;
- tsc_khz = pvclock_tsc_khz(src);
- put_cpu();
setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
- return tsc_khz;
+ return pvclock_tsc_khz(this_cpu_pvti());
}
-static void kvm_get_preset_lpj(void)
+static void __init kvm_get_preset_lpj(void)
{
unsigned long khz;
u64 lpj;
@@ -156,49 +159,40 @@ static void kvm_get_preset_lpj(void)
bool kvm_check_and_clear_guest_paused(void)
{
+ struct pvclock_vsyscall_time_info *src = this_cpu_hvclock();
bool ret = false;
- struct pvclock_vcpu_time_info *src;
- int cpu = smp_processor_id();
- if (!hv_clock)
+ if (!src)
return ret;
- src = &hv_clock[cpu].pvti;
- if ((src->flags & PVCLOCK_GUEST_STOPPED) != 0) {
- src->flags &= ~PVCLOCK_GUEST_STOPPED;
+ if ((src->pvti.flags & PVCLOCK_GUEST_STOPPED) != 0) {
+ src->pvti.flags &= ~PVCLOCK_GUEST_STOPPED;
pvclock_touch_watchdogs();
ret = true;
}
-
return ret;
}
struct clocksource kvm_clock = {
- .name = "kvm-clock",
- .read = kvm_clock_get_cycles,
- .rating = 400,
- .mask = CLOCKSOURCE_MASK(64),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ .name = "kvm-clock",
+ .read = kvm_clock_get_cycles,
+ .rating = 400,
+ .mask = CLOCKSOURCE_MASK(64),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
EXPORT_SYMBOL_GPL(kvm_clock);
-int kvm_register_clock(char *txt)
+static void kvm_register_clock(char *txt)
{
- int cpu = smp_processor_id();
- int low, high, ret;
- struct pvclock_vcpu_time_info *src;
-
- if (!hv_clock)
- return 0;
+ struct pvclock_vsyscall_time_info *src = this_cpu_hvclock();
+ u64 pa;
- src = &hv_clock[cpu].pvti;
- low = (int)slow_virt_to_phys(src) | 1;
- high = ((u64)slow_virt_to_phys(src) >> 32);
- ret = native_write_msr_safe(msr_kvm_system_time, low, high);
- printk(KERN_INFO "kvm-clock: cpu %d, msr %x:%x, %s\n",
- cpu, high, low, txt);
+ if (!src)
+ return;
- return ret;
+ pa = slow_virt_to_phys(&src->pvti) | 0x01ULL;
+ wrmsrl(msr_kvm_system_time, pa);
+ pr_info("kvm-clock: cpu %d, msr %llx, %s", smp_processor_id(), pa, txt);
}
static void kvm_save_sched_clock_state(void)
@@ -213,11 +207,7 @@ static void kvm_restore_sched_clock_state(void)
#ifdef CONFIG_X86_LOCAL_APIC
static void kvm_setup_secondary_clock(void)
{
- /*
- * Now that the first cpu already had this clocksource initialized,
- * we shouldn't fail.
- */
- WARN_ON(kvm_register_clock("secondary cpu clock"));
+ kvm_register_clock("secondary cpu clock");
}
#endif
@@ -245,100 +235,84 @@ static void kvm_shutdown(void)
native_machine_shutdown();
}
-static phys_addr_t __init kvm_memblock_alloc(phys_addr_t size,
- phys_addr_t align)
+static int __init kvm_setup_vsyscall_timeinfo(void)
{
- phys_addr_t mem;
+#ifdef CONFIG_X86_64
+ u8 flags;
- mem = memblock_alloc(size, align);
- if (!mem)
+ if (!per_cpu(hv_clock_per_cpu, 0) || !kvmclock_vsyscall)
return 0;
- if (sev_active()) {
- if (early_set_memory_decrypted((unsigned long)__va(mem), size))
- goto e_free;
- }
+ flags = pvclock_read_flags(&hv_clock_boot[0].pvti);
+ if (!(flags & PVCLOCK_TSC_STABLE_BIT))
+ return 0;
- return mem;
-e_free:
- memblock_free(mem, size);
+ kvm_clock.archdata.vclock_mode = VCLOCK_PVCLOCK;
+#endif
return 0;
}
+early_initcall(kvm_setup_vsyscall_timeinfo);
-static void __init kvm_memblock_free(phys_addr_t addr, phys_addr_t size)
+static int kvmclock_setup_percpu(unsigned int cpu)
{
- if (sev_active())
- early_set_memory_encrypted((unsigned long)__va(addr), size);
+ struct pvclock_vsyscall_time_info *p = per_cpu(hv_clock_per_cpu, cpu);
- memblock_free(addr, size);
+ /*
+ * The per cpu area setup replicates CPU0 data to all cpu
+ * pointers. So carefully check. CPU0 has been set up in init
+ * already.
+ */
+ if (!cpu || (p && p != per_cpu(hv_clock_per_cpu, 0)))
+ return 0;
+
+ /* Use the static page for the first CPUs, allocate otherwise */
+ if (cpu < HVC_BOOT_ARRAY_SIZE)
+ p = &hv_clock_boot[cpu];
+ else
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+
+ per_cpu(hv_clock_per_cpu, cpu) = p;
+ return p ? 0 : -ENOMEM;
}
void __init kvmclock_init(void)
{
- struct pvclock_vcpu_time_info *vcpu_time;
- unsigned long mem, mem_wall_clock;
- int size, cpu, wall_clock_size;
u8 flags;
- size = PAGE_ALIGN(sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS);
-
- if (!kvm_para_available())
+ if (!kvm_para_available() || !kvmclock)
return;
- if (kvmclock && kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) {
+ if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) {
msr_kvm_system_time = MSR_KVM_SYSTEM_TIME_NEW;
msr_kvm_wall_clock = MSR_KVM_WALL_CLOCK_NEW;
- } else if (!(kvmclock && kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE)))
- return;
-
- wall_clock_size = PAGE_ALIGN(sizeof(struct pvclock_wall_clock));
- mem_wall_clock = kvm_memblock_alloc(wall_clock_size, PAGE_SIZE);
- if (!mem_wall_clock)
- return;
-
- wall_clock = __va(mem_wall_clock);
- memset(wall_clock, 0, wall_clock_size);
-
- mem = kvm_memblock_alloc(size, PAGE_SIZE);
- if (!mem) {
- kvm_memblock_free(mem_wall_clock, wall_clock_size);
- wall_clock = NULL;
+ } else if (!kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE)) {
return;
}
- hv_clock = __va(mem);
- memset(hv_clock, 0, size);
-
- if (kvm_register_clock("primary cpu clock")) {
- hv_clock = NULL;
- kvm_memblock_free(mem, size);
- kvm_memblock_free(mem_wall_clock, wall_clock_size);
- wall_clock = NULL;
+ if (cpuhp_setup_state(CPUHP_BP_PREPARE_DYN, "kvmclock:setup_percpu",
+ kvmclock_setup_percpu, NULL) < 0) {
return;
}
- printk(KERN_INFO "kvm-clock: Using msrs %x and %x",
+ pr_info("kvm-clock: Using msrs %x and %x",
msr_kvm_system_time, msr_kvm_wall_clock);
- pvclock_set_pvti_cpu0_va(hv_clock);
+ this_cpu_write(hv_clock_per_cpu, &hv_clock_boot[0]);
+ kvm_register_clock("primary cpu clock");
+ pvclock_set_pvti_cpu0_va(hv_clock_boot);
if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE_STABLE_BIT))
pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
- cpu = get_cpu();
- vcpu_time = &hv_clock[cpu].pvti;
- flags = pvclock_read_flags(vcpu_time);
-
+ flags = pvclock_read_flags(&hv_clock_boot[0].pvti);
kvm_sched_clock_init(flags & PVCLOCK_TSC_STABLE_BIT);
- put_cpu();
x86_platform.calibrate_tsc = kvm_get_tsc_khz;
x86_platform.calibrate_cpu = kvm_get_tsc_khz;
x86_platform.get_wallclock = kvm_get_wallclock;
x86_platform.set_wallclock = kvm_set_wallclock;
#ifdef CONFIG_X86_LOCAL_APIC
- x86_cpuinit.early_percpu_clock_init =
- kvm_setup_secondary_clock;
+ x86_cpuinit.early_percpu_clock_init = kvm_setup_secondary_clock;
#endif
x86_platform.save_sched_clock_state = kvm_save_sched_clock_state;
x86_platform.restore_sched_clock_state = kvm_restore_sched_clock_state;
@@ -350,31 +324,3 @@ void __init kvmclock_init(void)
clocksource_register_hz(&kvm_clock, NSEC_PER_SEC);
pv_info.name = "KVM";
}
-
-int __init kvm_setup_vsyscall_timeinfo(void)
-{
-#ifdef CONFIG_X86_64
- int cpu;
- u8 flags;
- struct pvclock_vcpu_time_info *vcpu_time;
- unsigned int size;
-
- if (!hv_clock)
- return 0;
-
- size = PAGE_ALIGN(sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS);
-
- cpu = get_cpu();
-
- vcpu_time = &hv_clock[cpu].pvti;
- flags = pvclock_read_flags(vcpu_time);
-
- put_cpu();
-
- if (!(flags & PVCLOCK_TSC_STABLE_BIT))
- return 1;
-
- kvm_clock.archdata.vclock_mode = VCLOCK_PVCLOCK;
-#endif
- return 0;
-}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 2f86d883dd95..5d32c55aeb8b 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -866,6 +866,8 @@ void __init setup_arch(char **cmdline_p)
idt_setup_early_traps();
early_cpu_init();
+ arch_init_ideal_nops();
+ jump_label_init();
early_ioremap_init();
setup_olpc_ofw_pgd();
@@ -1012,6 +1014,7 @@ void __init setup_arch(char **cmdline_p)
*/
init_hypervisor_platform();
+ tsc_early_init();
x86_init.resources.probe_roms();
/* after parse_early_param, so could debug it */
@@ -1197,11 +1200,6 @@ void __init setup_arch(char **cmdline_p)
memblock_find_dma_reserve();
-#ifdef CONFIG_KVM_GUEST
- kvmclock_init();
-#endif
-
- tsc_early_delay_calibrate();
if (!early_xdbc_setup_hardware())
early_xdbc_register_console();
@@ -1272,8 +1270,6 @@ void __init setup_arch(char **cmdline_p)
mcheck_init();
- arch_init_ideal_nops();
-
register_refined_jiffies(CLOCK_TICK_RATE);
#ifdef CONFIG_EFI
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 74392d9d51e0..1463468ba9a0 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -33,16 +33,13 @@ EXPORT_SYMBOL(cpu_khz);
unsigned int __read_mostly tsc_khz;
EXPORT_SYMBOL(tsc_khz);
+#define KHZ 1000
+
/*
* TSC can be unstable due to cpufreq or due to unsynced TSCs
*/
static int __read_mostly tsc_unstable;
-/* native_sched_clock() is called before tsc_init(), so
- we must start with the TSC soft disabled to prevent
- erroneous rdtsc usage on !boot_cpu_has(X86_FEATURE_TSC) processors */
-static int __read_mostly tsc_disabled = -1;
-
static DEFINE_STATIC_KEY_FALSE(__use_tsc);
int tsc_clocksource_reliable;
@@ -106,23 +103,6 @@ void cyc2ns_read_end(void)
* -johnstul@us.ibm.com "math is hard, lets go shopping!"
*/
-static void cyc2ns_data_init(struct cyc2ns_data *data)
-{
- data->cyc2ns_mul = 0;
- data->cyc2ns_shift = 0;
- data->cyc2ns_offset = 0;
-}
-
-static void __init cyc2ns_init(int cpu)
-{
- struct cyc2ns *c2n = &per_cpu(cyc2ns, cpu);
-
- cyc2ns_data_init(&c2n->data[0]);
- cyc2ns_data_init(&c2n->data[1]);
-
- seqcount_init(&c2n->seq);
-}
-
static inline unsigned long long cycles_2_ns(unsigned long long cyc)
{
struct cyc2ns_data data;
@@ -138,18 +118,11 @@ static inline unsigned long long cycles_2_ns(unsigned long long cyc)
return ns;
}
-static void set_cyc2ns_scale(unsigned long khz, int cpu, unsigned long long tsc_now)
+static void __set_cyc2ns_scale(unsigned long khz, int cpu, unsigned long long tsc_now)
{
unsigned long long ns_now;
struct cyc2ns_data data;
struct cyc2ns *c2n;
- unsigned long flags;
-
- local_irq_save(flags);
- sched_clock_idle_sleep_event();
-
- if (!khz)
- goto done;
ns_now = cycles_2_ns(tsc_now);
@@ -181,13 +154,56 @@ static void set_cyc2ns_scale(unsigned long khz, int cpu, unsigned long long tsc_
c2n->data[0] = data;
raw_write_seqcount_latch(&c2n->seq);
c2n->data[1] = data;
+}
+
+static void set_cyc2ns_scale(unsigned long khz, int cpu, unsigned long long tsc_now)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ sched_clock_idle_sleep_event();
+
+ if (khz)
+ __set_cyc2ns_scale(khz, cpu, tsc_now);
-done:
sched_clock_idle_wakeup_event();
local_irq_restore(flags);
}
/*
+ * Initialize cyc2ns for boot cpu
+ */
+static void __init cyc2ns_init_boot_cpu(void)
+{
+ struct cyc2ns *c2n = this_cpu_ptr(&cyc2ns);
+
+ seqcount_init(&c2n->seq);
+ __set_cyc2ns_scale(tsc_khz, smp_processor_id(), rdtsc());
+}
+
+/*
+ * Secondary CPUs do not run through tsc_init(), so set up
+ * all the scale factors for all CPUs, assuming the same
+ * speed as the bootup CPU. (cpufreq notifiers will fix this
+ * up if their speed diverges)
+ */
+static void __init cyc2ns_init_secondary_cpus(void)
+{
+ unsigned int cpu, this_cpu = smp_processor_id();
+ struct cyc2ns *c2n = this_cpu_ptr(&cyc2ns);
+ struct cyc2ns_data *data = c2n->data;
+
+ for_each_possible_cpu(cpu) {
+ if (cpu != this_cpu) {
+ seqcount_init(&c2n->seq);
+ c2n = per_cpu_ptr(&cyc2ns, cpu);
+ c2n->data[0] = data[0];
+ c2n->data[1] = data[1];
+ }
+ }
+}
+
+/*
* Scheduler clock - returns current time in nanosec units.
*/
u64 native_sched_clock(void)
@@ -248,8 +264,7 @@ EXPORT_SYMBOL_GPL(check_tsc_unstable);
#ifdef CONFIG_X86_TSC
int __init notsc_setup(char *str)
{
- pr_warn("Kernel compiled with CONFIG_X86_TSC, cannot disable TSC completely\n");
- tsc_disabled = 1;
+ mark_tsc_unstable("boot parameter notsc");
return 1;
}
#else
@@ -665,30 +680,17 @@ static unsigned long cpu_khz_from_cpuid(void)
return eax_base_mhz * 1000;
}
-/**
- * native_calibrate_cpu - calibrate the cpu on boot
+/*
+ * calibrate cpu using pit, hpet, and ptimer methods. They are available
+ * later in boot after acpi is initialized.
*/
-unsigned long native_calibrate_cpu(void)
+static unsigned long pit_hpet_ptimer_calibrate_cpu(void)
{
u64 tsc1, tsc2, delta, ref1, ref2;
unsigned long tsc_pit_min = ULONG_MAX, tsc_ref_min = ULONG_MAX;
- unsigned long flags, latch, ms, fast_calibrate;
+ unsigned long flags, latch, ms;
int hpet = is_hpet_enabled(), i, loopmin;
- fast_calibrate = cpu_khz_from_cpuid();
- if (fast_calibrate)
- return fast_calibrate;
-
- fast_calibrate = cpu_khz_from_msr();
- if (fast_calibrate)
- return fast_calibrate;
-
- local_irq_save(flags);
- fast_calibrate = quick_pit_calibrate();
- local_irq_restore(flags);
- if (fast_calibrate)
- return fast_calibrate;
-
/*
* Run 5 calibration loops to get the lowest frequency value
* (the best estimate). We use two different calibration modes
@@ -831,6 +833,37 @@ unsigned long native_calibrate_cpu(void)
return tsc_pit_min;
}
+/**
+ * native_calibrate_cpu_early - can calibrate the cpu early in boot
+ */
+unsigned long native_calibrate_cpu_early(void)
+{
+ unsigned long flags, fast_calibrate = cpu_khz_from_cpuid();
+
+ if (!fast_calibrate)
+ fast_calibrate = cpu_khz_from_msr();
+ if (!fast_calibrate) {
+ local_irq_save(flags);
+ fast_calibrate = quick_pit_calibrate();
+ local_irq_restore(flags);
+ }
+ return fast_calibrate;
+}
+
+
+/**
+ * native_calibrate_cpu - calibrate the cpu
+ */
+static unsigned long native_calibrate_cpu(void)
+{
+ unsigned long tsc_freq = native_calibrate_cpu_early();
+
+ if (!tsc_freq)
+ tsc_freq = pit_hpet_ptimer_calibrate_cpu();
+
+ return tsc_freq;
+}
+
void recalibrate_cpu_khz(void)
{
#ifndef CONFIG_SMP
@@ -1307,7 +1340,7 @@ unreg:
static int __init init_tsc_clocksource(void)
{
- if (!boot_cpu_has(X86_FEATURE_TSC) || tsc_disabled > 0 || !tsc_khz)
+ if (!boot_cpu_has(X86_FEATURE_TSC) || !tsc_khz)
return 0;
if (tsc_unstable)
@@ -1341,40 +1374,22 @@ unreg:
*/
device_initcall(init_tsc_clocksource);
-void __init tsc_early_delay_calibrate(void)
+static bool __init determine_cpu_tsc_frequencies(bool early)
{
- unsigned long lpj;
-
- if (!boot_cpu_has(X86_FEATURE_TSC))
- return;
-
- cpu_khz = x86_platform.calibrate_cpu();
- tsc_khz = x86_platform.calibrate_tsc();
-
- tsc_khz = tsc_khz ? : cpu_khz;
- if (!tsc_khz)
- return;
-
- lpj = tsc_khz * 1000;
- do_div(lpj, HZ);
- loops_per_jiffy = lpj;
-}
-
-void __init tsc_init(void)
-{
- u64 lpj, cyc;
- int cpu;
-
- if (!boot_cpu_has(X86_FEATURE_TSC)) {
- setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
- return;
+ /* Make sure that cpu and tsc are not already calibrated */
+ WARN_ON(cpu_khz || tsc_khz);
+
+ if (early) {
+ cpu_khz = x86_platform.calibrate_cpu();
+ tsc_khz = x86_platform.calibrate_tsc();
+ } else {
+ /* We should not be here with non-native cpu calibration */
+ WARN_ON(x86_platform.calibrate_cpu != native_calibrate_cpu);
+ cpu_khz = pit_hpet_ptimer_calibrate_cpu();
}
- cpu_khz = x86_platform.calibrate_cpu();
- tsc_khz = x86_platform.calibrate_tsc();
-
/*
- * Trust non-zero tsc_khz as authorative,
+ * Trust non-zero tsc_khz as authoritative,
* and use it to sanity check cpu_khz,
* which will be off if system timer is off.
*/
@@ -1383,52 +1398,78 @@ void __init tsc_init(void)
else if (abs(cpu_khz - tsc_khz) * 10 > tsc_khz)
cpu_khz = tsc_khz;
- if (!tsc_khz) {
- mark_tsc_unstable("could not calculate TSC khz");
- setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
- return;
- }
+ if (tsc_khz == 0)
+ return false;
pr_info("Detected %lu.%03lu MHz processor\n",
- (unsigned long)cpu_khz / 1000,
- (unsigned long)cpu_khz % 1000);
+ (unsigned long)cpu_khz / KHZ,
+ (unsigned long)cpu_khz % KHZ);
if (cpu_khz != tsc_khz) {
pr_info("Detected %lu.%03lu MHz TSC",
- (unsigned long)tsc_khz / 1000,
- (unsigned long)tsc_khz % 1000);
+ (unsigned long)tsc_khz / KHZ,
+ (unsigned long)tsc_khz % KHZ);
}
+ return true;
+}
+
+static unsigned long __init get_loops_per_jiffy(void)
+{
+ unsigned long lpj = tsc_khz * KHZ;
+ do_div(lpj, HZ);
+ return lpj;
+}
+
+static void __init tsc_enable_sched_clock(void)
+{
/* Sanitize TSC ADJUST before cyc2ns gets initialized */
tsc_store_and_check_tsc_adjust(true);
+ cyc2ns_init_boot_cpu();
+ static_branch_enable(&__use_tsc);
+}
+
+void __init tsc_early_init(void)
+{
+ if (!boot_cpu_has(X86_FEATURE_TSC))
+ return;
+ if (!determine_cpu_tsc_frequencies(true))
+ return;
+ loops_per_jiffy = get_loops_per_jiffy();
+ tsc_enable_sched_clock();
+}
+
+void __init tsc_init(void)
+{
/*
- * Secondary CPUs do not run through tsc_init(), so set up
- * all the scale factors for all CPUs, assuming the same
- * speed as the bootup CPU. (cpufreq notifiers will fix this
- * up if their speed diverges)
+ * native_calibrate_cpu_early can only calibrate using methods that are
+ * available early in boot.
*/
- cyc = rdtsc();
- for_each_possible_cpu(cpu) {
- cyc2ns_init(cpu);
- set_cyc2ns_scale(tsc_khz, cpu, cyc);
- }
+ if (x86_platform.calibrate_cpu == native_calibrate_cpu_early)
+ x86_platform.calibrate_cpu = native_calibrate_cpu;
- if (tsc_disabled > 0)
+ if (!boot_cpu_has(X86_FEATURE_TSC)) {
+ setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
return;
+ }
- /* now allow native_sched_clock() to use rdtsc */
+ if (!tsc_khz) {
+ /* We failed to determine frequencies earlier, try again */
+ if (!determine_cpu_tsc_frequencies(false)) {
+ mark_tsc_unstable("could not calculate TSC khz");
+ setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
+ return;
+ }
+ tsc_enable_sched_clock();
+ }
- tsc_disabled = 0;
- static_branch_enable(&__use_tsc);
+ cyc2ns_init_secondary_cpus();
if (!no_sched_irq_time)
enable_sched_clock_irqtime();
- lpj = ((u64)tsc_khz * 1000);
- do_div(lpj, HZ);
- lpj_fine = lpj;
-
+ lpj_fine = get_loops_per_jiffy();
use_tsc_delay();
check_system_tsc_reliable();
@@ -1455,7 +1496,7 @@ unsigned long calibrate_delay_is_known(void)
int constant_tsc = cpu_has(&cpu_data(cpu), X86_FEATURE_CONSTANT_TSC);
const struct cpumask *mask = topology_core_cpumask(cpu);
- if (tsc_disabled || !constant_tsc || !mask)
+ if (!constant_tsc || !mask)
return 0;
sibling = cpumask_any_but(mask, cpu);
diff --git a/arch/x86/kernel/tsc_msr.c b/arch/x86/kernel/tsc_msr.c
index 19afdbd7d0a7..27ef714d886c 100644
--- a/arch/x86/kernel/tsc_msr.c
+++ b/arch/x86/kernel/tsc_msr.c
@@ -1,17 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
/*
- * tsc_msr.c - TSC frequency enumeration via MSR
+ * TSC frequency enumeration via MSR
*
- * Copyright (C) 2013 Intel Corporation
+ * Copyright (C) 2013, 2018 Intel Corporation
* Author: Bin Gao <bin.gao@intel.com>
- *
- * This file is released under the GPLv2.
*/
#include <linux/kernel.h>
-#include <asm/processor.h>
-#include <asm/setup.h>
+
#include <asm/apic.h>
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.h>
+#include <asm/msr.h>
#include <asm/param.h>
+#include <asm/tsc.h>
#define MAX_NUM_FREQS 9
@@ -23,44 +25,48 @@
* field msr_plat does.
*/
struct freq_desc {
- u8 x86_family; /* CPU family */
- u8 x86_model; /* model */
u8 msr_plat; /* 1: use MSR_PLATFORM_INFO, 0: MSR_IA32_PERF_STATUS */
u32 freqs[MAX_NUM_FREQS];
};
-static struct freq_desc freq_desc_tables[] = {
- /* PNW */
- { 6, 0x27, 0, { 0, 0, 0, 0, 0, 99840, 0, 83200 } },
- /* CLV+ */
- { 6, 0x35, 0, { 0, 133200, 0, 0, 0, 99840, 0, 83200 } },
- /* TNG - Intel Atom processor Z3400 series */
- { 6, 0x4a, 1, { 0, 100000, 133300, 0, 0, 0, 0, 0 } },
- /* VLV2 - Intel Atom processor E3000, Z3600, Z3700 series */
- { 6, 0x37, 1, { 83300, 100000, 133300, 116700, 80000, 0, 0, 0 } },
- /* ANN - Intel Atom processor Z3500 series */
- { 6, 0x5a, 1, { 83300, 100000, 133300, 100000, 0, 0, 0, 0 } },
- /* AMT - Intel Atom processor X7-Z8000 and X5-Z8000 series */
- { 6, 0x4c, 1, { 83300, 100000, 133300, 116700,
- 80000, 93300, 90000, 88900, 87500 } },
+/*
+ * Penwell and Clovertrail use spread spectrum clock,
+ * so the freq number is not exactly the same as reported
+ * by MSR based on SDM.
+ */
+static const struct freq_desc freq_desc_pnw = {
+ 0, { 0, 0, 0, 0, 0, 99840, 0, 83200 }
};
-static int match_cpu(u8 family, u8 model)
-{
- int i;
+static const struct freq_desc freq_desc_clv = {
+ 0, { 0, 133200, 0, 0, 0, 99840, 0, 83200 }
+};
- for (i = 0; i < ARRAY_SIZE(freq_desc_tables); i++) {
- if ((family == freq_desc_tables[i].x86_family) &&
- (model == freq_desc_tables[i].x86_model))
- return i;
- }
+static const struct freq_desc freq_desc_byt = {
+ 1, { 83300, 100000, 133300, 116700, 80000, 0, 0, 0 }
+};
- return -1;
-}
+static const struct freq_desc freq_desc_cht = {
+ 1, { 83300, 100000, 133300, 116700, 80000, 93300, 90000, 88900, 87500 }
+};
-/* Map CPU reference clock freq ID(0-7) to CPU reference clock freq(KHz) */
-#define id_to_freq(cpu_index, freq_id) \
- (freq_desc_tables[cpu_index].freqs[freq_id])
+static const struct freq_desc freq_desc_tng = {
+ 1, { 0, 100000, 133300, 0, 0, 0, 0, 0 }
+};
+
+static const struct freq_desc freq_desc_ann = {
+ 1, { 83300, 100000, 133300, 100000, 0, 0, 0, 0 }
+};
+
+static const struct x86_cpu_id tsc_msr_cpu_ids[] = {
+ INTEL_CPU_FAM6(ATOM_PENWELL, freq_desc_pnw),
+ INTEL_CPU_FAM6(ATOM_CLOVERVIEW, freq_desc_clv),
+ INTEL_CPU_FAM6(ATOM_SILVERMONT1, freq_desc_byt),
+ INTEL_CPU_FAM6(ATOM_AIRMONT, freq_desc_cht),
+ INTEL_CPU_FAM6(ATOM_MERRIFIELD, freq_desc_tng),
+ INTEL_CPU_FAM6(ATOM_MOOREFIELD, freq_desc_ann),
+ {}
+};
/*
* MSR-based CPU/TSC frequency discovery for certain CPUs.
@@ -70,18 +76,17 @@ static int match_cpu(u8 family, u8 model)
*/
unsigned long cpu_khz_from_msr(void)
{
- u32 lo, hi, ratio, freq_id, freq;
+ u32 lo, hi, ratio, freq;
+ const struct freq_desc *freq_desc;
+ const struct x86_cpu_id *id;
unsigned long res;
- int cpu_index;
-
- if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
- return 0;
- cpu_index = match_cpu(boot_cpu_data.x86, boot_cpu_data.x86_model);
- if (cpu_index < 0)
+ id = x86_match_cpu(tsc_msr_cpu_ids);
+ if (!id)
return 0;
- if (freq_desc_tables[cpu_index].msr_plat) {
+ freq_desc = (struct freq_desc *)id->driver_data;
+ if (freq_desc->msr_plat) {
rdmsr(MSR_PLATFORM_INFO, lo, hi);
ratio = (lo >> 8) & 0xff;
} else {
@@ -91,8 +96,9 @@ unsigned long cpu_khz_from_msr(void)
/* Get FSB FREQ ID */
rdmsr(MSR_FSB_FREQ, lo, hi);
- freq_id = lo & 0x7;
- freq = id_to_freq(cpu_index, freq_id);
+
+ /* Map CPU reference clock freq ID(0-7) to CPU reference clock freq(KHz) */
+ freq = freq_desc->freqs[lo & 0x7];
/* TSC frequency = maximum resolved freq * maximum resolved bus ratio */
res = freq * ratio;
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 3ab867603e81..2792b5573818 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -109,7 +109,7 @@ struct x86_cpuinit_ops x86_cpuinit = {
static void default_nmi_init(void) { };
struct x86_platform_ops x86_platform __ro_after_init = {
- .calibrate_cpu = native_calibrate_cpu,
+ .calibrate_cpu = native_calibrate_cpu_early,
.calibrate_tsc = native_calibrate_tsc,
.get_wallclock = mach_get_cmos_time,
.set_wallclock = mach_set_rtc_mmss,
diff --git a/arch/x86/platform/intel-mid/Makefile b/arch/x86/platform/intel-mid/Makefile
index fa021dfab088..5cf886c867c2 100644
--- a/arch/x86/platform/intel-mid/Makefile
+++ b/arch/x86/platform/intel-mid/Makefile
@@ -1,4 +1,4 @@
-obj-$(CONFIG_X86_INTEL_MID) += intel-mid.o intel_mid_vrtc.o mfld.o mrfld.o pwr.o
+obj-$(CONFIG_X86_INTEL_MID) += intel-mid.o intel_mid_vrtc.o pwr.o
# SFI specific code
ifdef CONFIG_X86_INTEL_MID
diff --git a/arch/x86/platform/intel-mid/intel-mid.c b/arch/x86/platform/intel-mid/intel-mid.c
index 2ebdf31d9996..56f66eafb94f 100644
--- a/arch/x86/platform/intel-mid/intel-mid.c
+++ b/arch/x86/platform/intel-mid/intel-mid.c
@@ -36,8 +36,6 @@
#include <asm/apb_timer.h>
#include <asm/reboot.h>
-#include "intel_mid_weak_decls.h"
-
/*
* the clockevent devices on Moorestown/Medfield can be APBT or LAPIC clock,
* cmdline option x86_intel_mid_timer can be used to override the configuration
@@ -61,10 +59,6 @@
enum intel_mid_timer_options intel_mid_timer_options;
-/* intel_mid_ops to store sub arch ops */
-static struct intel_mid_ops *intel_mid_ops;
-/* getter function for sub arch ops*/
-static void *(*get_intel_mid_ops[])(void) = INTEL_MID_OPS_INIT;
enum intel_mid_cpu_type __intel_mid_cpu_chip;
EXPORT_SYMBOL_GPL(__intel_mid_cpu_chip);
@@ -82,11 +76,6 @@ static void intel_mid_reboot(void)
intel_scu_ipc_simple_command(IPCMSG_COLD_RESET, 0);
}
-static unsigned long __init intel_mid_calibrate_tsc(void)
-{
- return 0;
-}
-
static void __init intel_mid_setup_bp_timer(void)
{
apbt_time_init();
@@ -133,6 +122,7 @@ static void intel_mid_arch_setup(void)
case 0x3C:
case 0x4A:
__intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_TANGIER;
+ x86_platform.legacy.rtc = 1;
break;
case 0x27:
default:
@@ -140,17 +130,7 @@ static void intel_mid_arch_setup(void)
break;
}
- if (__intel_mid_cpu_chip < MAX_CPU_OPS(get_intel_mid_ops))
- intel_mid_ops = get_intel_mid_ops[__intel_mid_cpu_chip]();
- else {
- intel_mid_ops = get_intel_mid_ops[INTEL_MID_CPU_CHIP_PENWELL]();
- pr_info("ARCH: Unknown SoC, assuming Penwell!\n");
- }
-
out:
- if (intel_mid_ops->arch_setup)
- intel_mid_ops->arch_setup();
-
/*
* Intel MID platforms are using explicitly defined regulators.
*
@@ -191,7 +171,6 @@ void __init x86_intel_mid_early_setup(void)
x86_cpuinit.setup_percpu_clockev = apbt_setup_secondary_clock;
- x86_platform.calibrate_tsc = intel_mid_calibrate_tsc;
x86_platform.get_nmi_reason = intel_mid_get_nmi_reason;
x86_init.pci.arch_init = intel_mid_pci_init;
diff --git a/arch/x86/platform/intel-mid/intel_mid_weak_decls.h b/arch/x86/platform/intel-mid/intel_mid_weak_decls.h
deleted file mode 100644
index 3c1c3866d82b..000000000000
--- a/arch/x86/platform/intel-mid/intel_mid_weak_decls.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * intel_mid_weak_decls.h: Weak declarations of intel-mid.c
- *
- * (C) Copyright 2013 Intel Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-
-
-/* For every CPU addition a new get_<cpuname>_ops interface needs
- * to be added.
- */
-extern void *get_penwell_ops(void);
-extern void *get_cloverview_ops(void);
-extern void *get_tangier_ops(void);
diff --git a/arch/x86/platform/intel-mid/mfld.c b/arch/x86/platform/intel-mid/mfld.c
deleted file mode 100644
index e42978d4deaf..000000000000
--- a/arch/x86/platform/intel-mid/mfld.c
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * mfld.c: Intel Medfield platform setup code
- *
- * (C) Copyright 2013 Intel Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-
-#include <linux/init.h>
-
-#include <asm/apic.h>
-#include <asm/intel-mid.h>
-#include <asm/intel_mid_vrtc.h>
-
-#include "intel_mid_weak_decls.h"
-
-static unsigned long __init mfld_calibrate_tsc(void)
-{
- unsigned long fast_calibrate;
- u32 lo, hi, ratio, fsb;
-
- rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
- pr_debug("IA32 perf status is 0x%x, 0x%0x\n", lo, hi);
- ratio = (hi >> 8) & 0x1f;
- pr_debug("ratio is %d\n", ratio);
- if (!ratio) {
- pr_err("read a zero ratio, should be incorrect!\n");
- pr_err("force tsc ratio to 16 ...\n");
- ratio = 16;
- }
- rdmsr(MSR_FSB_FREQ, lo, hi);
- if ((lo & 0x7) == 0x7)
- fsb = FSB_FREQ_83SKU;
- else
- fsb = FSB_FREQ_100SKU;
- fast_calibrate = ratio * fsb;
- pr_debug("read penwell tsc %lu khz\n", fast_calibrate);
- lapic_timer_frequency = fsb * 1000 / HZ;
-
- /*
- * TSC on Intel Atom SoCs is reliable and of known frequency.
- * See tsc_msr.c for details.
- */
- setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
- setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE);
-
- return fast_calibrate;
-}
-
-static void __init penwell_arch_setup(void)
-{
- x86_platform.calibrate_tsc = mfld_calibrate_tsc;
-}
-
-static struct intel_mid_ops penwell_ops = {
- .arch_setup = penwell_arch_setup,
-};
-
-void *get_penwell_ops(void)
-{
- return &penwell_ops;
-}
-
-void *get_cloverview_ops(void)
-{
- return &penwell_ops;
-}
diff --git a/arch/x86/platform/intel-mid/mrfld.c b/arch/x86/platform/intel-mid/mrfld.c
deleted file mode 100644
index ae7bdeb0e507..000000000000
--- a/arch/x86/platform/intel-mid/mrfld.c
+++ /dev/null
@@ -1,105 +0,0 @@
-/*
- * Intel Merrifield platform specific setup code
- *
- * (C) Copyright 2013 Intel Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-
-#include <linux/init.h>
-
-#include <asm/apic.h>
-#include <asm/intel-mid.h>
-
-#include "intel_mid_weak_decls.h"
-
-static unsigned long __init tangier_calibrate_tsc(void)
-{
- unsigned long fast_calibrate;
- u32 lo, hi, ratio, fsb, bus_freq;
-
- /* *********************** */
- /* Compute TSC:Ratio * FSB */
- /* *********************** */
-
- /* Compute Ratio */
- rdmsr(MSR_PLATFORM_INFO, lo, hi);
- pr_debug("IA32 PLATFORM_INFO is 0x%x : %x\n", hi, lo);
-
- ratio = (lo >> 8) & 0xFF;
- pr_debug("ratio is %d\n", ratio);
- if (!ratio) {
- pr_err("Read a zero ratio, force tsc ratio to 4 ...\n");
- ratio = 4;
- }
-
- /* Compute FSB */
- rdmsr(MSR_FSB_FREQ, lo, hi);
- pr_debug("Actual FSB frequency detected by SOC 0x%x : %x\n",
- hi, lo);
-
- bus_freq = lo & 0x7;
- pr_debug("bus_freq = 0x%x\n", bus_freq);
-
- if (bus_freq == 0)
- fsb = FSB_FREQ_100SKU;
- else if (bus_freq == 1)
- fsb = FSB_FREQ_100SKU;
- else if (bus_freq == 2)
- fsb = FSB_FREQ_133SKU;
- else if (bus_freq == 3)
- fsb = FSB_FREQ_167SKU;
- else if (bus_freq == 4)
- fsb = FSB_FREQ_83SKU;
- else if (bus_freq == 5)
- fsb = FSB_FREQ_400SKU;
- else if (bus_freq == 6)
- fsb = FSB_FREQ_267SKU;
- else if (bus_freq == 7)
- fsb = FSB_FREQ_333SKU;
- else {
- BUG();
- pr_err("Invalid bus_freq! Setting to minimal value!\n");
- fsb = FSB_FREQ_100SKU;
- }
-
- /* TSC = FSB Freq * Resolved HFM Ratio */
- fast_calibrate = ratio * fsb;
- pr_debug("calculate tangier tsc %lu KHz\n", fast_calibrate);
-
- /* ************************************ */
- /* Calculate Local APIC Timer Frequency */
- /* ************************************ */
- lapic_timer_frequency = (fsb * 1000) / HZ;
-
- pr_debug("Setting lapic_timer_frequency = %d\n",
- lapic_timer_frequency);
-
- /*
- * TSC on Intel Atom SoCs is reliable and of known frequency.
- * See tsc_msr.c for details.
- */
- setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
- setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE);
-
- return fast_calibrate;
-}
-
-static void __init tangier_arch_setup(void)
-{
- x86_platform.calibrate_tsc = tangier_calibrate_tsc;
- x86_platform.legacy.rtc = 1;
-}
-
-/* tangier arch ops */
-static struct intel_mid_ops tangier_ops = {
- .arch_setup = tangier_arch_setup,
-};
-
-void *get_tangier_ops(void)
-{
- return &tangier_ops;
-}
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 439a94bf89ad..105a57d73701 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -119,6 +119,27 @@ static void __init xen_banner(void)
version >> 16, version & 0xffff, extra.extraversion,
xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
}
+
+static void __init xen_pv_init_platform(void)
+{
+ set_fixmap(FIX_PARAVIRT_BOOTMAP, xen_start_info->shared_info);
+ HYPERVISOR_shared_info = (void *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
+
+ /* xen clock uses per-cpu vcpu_info, need to init it for boot cpu */
+ xen_vcpu_info_reset(0);
+
+ /* pvclock is in shared info area */
+ xen_init_time_ops();
+}
+
+static void __init xen_pv_guest_late_init(void)
+{
+#ifndef CONFIG_SMP
+ /* Setup shared vcpu info for non-smp configurations */
+ xen_setup_vcpu_info_placement();
+#endif
+}
+
/* Check if running on Xen version (major, minor) or later */
bool
xen_running_on_version_or_later(unsigned int major, unsigned int minor)
@@ -947,34 +968,8 @@ static void xen_write_msr(unsigned int msr, unsigned low, unsigned high)
xen_write_msr_safe(msr, low, high);
}
-void xen_setup_shared_info(void)
-{
- set_fixmap(FIX_PARAVIRT_BOOTMAP, xen_start_info->shared_info);
-
- HYPERVISOR_shared_info =
- (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
-
- xen_setup_mfn_list_list();
-
- if (system_state == SYSTEM_BOOTING) {
-#ifndef CONFIG_SMP
- /*
- * In UP this is as good a place as any to set up shared info.
- * Limit this to boot only, at restore vcpu setup is done via
- * xen_vcpu_restore().
- */
- xen_setup_vcpu_info_placement();
-#endif
- /*
- * Now that shared info is set up we can start using routines
- * that point to pvclock area.
- */
- xen_init_time_ops();
- }
-}
-
/* This is called once we have the cpu_possible_mask */
-void __ref xen_setup_vcpu_info_placement(void)
+void __init xen_setup_vcpu_info_placement(void)
{
int cpu;
@@ -1228,6 +1223,8 @@ asmlinkage __visible void __init xen_start_kernel(void)
x86_init.irqs.intr_mode_init = x86_init_noop;
x86_init.oem.arch_setup = xen_arch_setup;
x86_init.oem.banner = xen_banner;
+ x86_init.hyper.init_platform = xen_pv_init_platform;
+ x86_init.hyper.guest_late_init = xen_pv_guest_late_init;
/*
* Set up some pagetable state before starting to set any ptes.
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index 2c30cabfda90..52206ad81e4b 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -1230,8 +1230,7 @@ static void __init xen_pagetable_p2m_free(void)
* We roundup to the PMD, which means that if anybody at this stage is
* using the __ka address of xen_start_info or
* xen_start_info->shared_info they are in going to crash. Fortunatly
- * we have already revectored in xen_setup_kernel_pagetable and in
- * xen_setup_shared_info.
+ * we have already revectored in xen_setup_kernel_pagetable.
*/
size = roundup(size, PMD_SIZE);
@@ -1292,8 +1291,7 @@ static void __init xen_pagetable_init(void)
/* Remap memory freed due to conflicts with E820 map */
xen_remap_memory();
-
- xen_setup_shared_info();
+ xen_setup_mfn_list_list();
}
static void xen_write_cr2(unsigned long cr2)
{
diff --git a/arch/x86/xen/suspend_pv.c b/arch/x86/xen/suspend_pv.c
index a2e0f110af56..8303b58c79a9 100644
--- a/arch/x86/xen/suspend_pv.c
+++ b/arch/x86/xen/suspend_pv.c
@@ -27,8 +27,9 @@ void xen_pv_pre_suspend(void)
void xen_pv_post_suspend(int suspend_cancelled)
{
xen_build_mfn_list_list();
-
- xen_setup_shared_info();
+ set_fixmap(FIX_PARAVIRT_BOOTMAP, xen_start_info->shared_info);
+ HYPERVISOR_shared_info = (void *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
+ xen_setup_mfn_list_list();
if (suspend_cancelled) {
xen_start_info->store_mfn =
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index e0f1bcf01d63..c84f1e039d84 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -31,6 +31,8 @@
/* Xen may fire a timer up to this many ns early */
#define TIMER_SLOP 100000
+static u64 xen_sched_clock_offset __read_mostly;
+
/* Get the TSC speed from Xen */
static unsigned long xen_tsc_khz(void)
{
@@ -40,7 +42,7 @@ static unsigned long xen_tsc_khz(void)
return pvclock_tsc_khz(info);
}
-u64 xen_clocksource_read(void)
+static u64 xen_clocksource_read(void)
{
struct pvclock_vcpu_time_info *src;
u64 ret;
@@ -57,6 +59,11 @@ static u64 xen_clocksource_get_cycles(struct clocksource *cs)
return xen_clocksource_read();
}
+static u64 xen_sched_clock(void)
+{
+ return xen_clocksource_read() - xen_sched_clock_offset;
+}
+
static void xen_read_wallclock(struct timespec64 *ts)
{
struct shared_info *s = HYPERVISOR_shared_info;
@@ -367,7 +374,7 @@ void xen_timer_resume(void)
}
static const struct pv_time_ops xen_time_ops __initconst = {
- .sched_clock = xen_clocksource_read,
+ .sched_clock = xen_sched_clock,
.steal_clock = xen_steal_clock,
};
@@ -503,8 +510,9 @@ static void __init xen_time_init(void)
pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
}
-void __ref xen_init_time_ops(void)
+void __init xen_init_time_ops(void)
{
+ xen_sched_clock_offset = xen_clocksource_read();
pv_time_ops = xen_time_ops;
x86_init.timers.timer_init = xen_time_init;
@@ -542,11 +550,11 @@ void __init xen_hvm_init_time_ops(void)
return;
if (!xen_feature(XENFEAT_hvm_safe_pvclock)) {
- printk(KERN_INFO "Xen doesn't support pvclock on HVM,"
- "disable pv timer\n");
+ pr_info("Xen doesn't support pvclock on HVM, disable pv timer");
return;
}
+ xen_sched_clock_offset = xen_clocksource_read();
pv_time_ops = xen_time_ops;
x86_init.timers.setup_percpu_clockev = xen_time_init;
x86_cpuinit.setup_percpu_clockev = xen_hvm_setup_cpu_clockevents;
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 3b34745d0a52..e78684597f57 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -31,7 +31,6 @@ extern struct shared_info xen_dummy_shared_info;
extern struct shared_info *HYPERVISOR_shared_info;
void xen_setup_mfn_list_list(void);
-void xen_setup_shared_info(void);
void xen_build_mfn_list_list(void);
void xen_setup_machphys_mapping(void);
void xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
@@ -68,12 +67,11 @@ void xen_init_irq_ops(void);
void xen_setup_timer(int cpu);
void xen_setup_runstate_info(int cpu);
void xen_teardown_timer(int cpu);
-u64 xen_clocksource_read(void);
void xen_setup_cpu_clockevents(void);
void xen_save_time_memory_area(void);
void xen_restore_time_memory_area(void);
-void __ref xen_init_time_ops(void);
-void __init xen_hvm_init_time_ops(void);
+void xen_init_time_ops(void);
+void xen_hvm_init_time_ops(void);
irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c
index dabf0a103567..aa624885e0e2 100644
--- a/drivers/clocksource/tegra20_timer.c
+++ b/drivers/clocksource/tegra20_timer.c
@@ -259,6 +259,6 @@ static int __init tegra20_init_rtc(struct device_node *np)
else
clk_prepare_enable(clk);
- return register_persistent_clock(NULL, tegra_read_persistent_clock64);
+ return register_persistent_clock(tegra_read_persistent_clock64);
}
TIMER_OF_DECLARE(tegra20_rtc, "nvidia,tegra20-rtc", tegra20_init_rtc);
diff --git a/include/linux/sched_clock.h b/include/linux/sched_clock.h
index 411b52e424e1..abe28d5cb3f4 100644
--- a/include/linux/sched_clock.h
+++ b/include/linux/sched_clock.h
@@ -9,17 +9,16 @@
#define LINUX_SCHED_CLOCK
#ifdef CONFIG_GENERIC_SCHED_CLOCK
-extern void sched_clock_postinit(void);
+extern void generic_sched_clock_init(void);
extern void sched_clock_register(u64 (*read)(void), int bits,
unsigned long rate);
#else
-static inline void sched_clock_postinit(void) { }
+static inline void generic_sched_clock_init(void) { }
static inline void sched_clock_register(u64 (*read)(void), int bits,
unsigned long rate)
{
- ;
}
#endif
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index edace6b656e9..e79861418fd7 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -243,7 +243,8 @@ extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot);
extern int persistent_clock_is_local;
extern void read_persistent_clock64(struct timespec64 *ts);
-extern void read_boot_clock64(struct timespec64 *ts);
+void read_persistent_clock_and_boot_offset(struct timespec64 *wall_clock,
+ struct timespec64 *boot_offset);
extern int update_persistent_clock64(struct timespec64 now);
/*
diff --git a/init/main.c b/init/main.c
index f86b64c35d38..38c68b593d0d 100644
--- a/init/main.c
+++ b/init/main.c
@@ -79,7 +79,7 @@
#include <linux/pti.h>
#include <linux/blkdev.h>
#include <linux/elevator.h>
-#include <linux/sched_clock.h>
+#include <linux/sched/clock.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/context_tracking.h>
@@ -642,7 +642,6 @@ asmlinkage __visible void __init start_kernel(void)
softirq_init();
timekeeping_init();
time_init();
- sched_clock_postinit();
printk_safe_init();
perf_event_init();
profile_init();
@@ -697,6 +696,7 @@ asmlinkage __visible void __init start_kernel(void)
acpi_early_init();
if (late_time_init)
late_time_init();
+ sched_clock_init();
calibrate_delay();
pid_idr_init();
anon_vma_init();
diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c
index 10c83e73837a..e3e3b979f9bd 100644
--- a/kernel/sched/clock.c
+++ b/kernel/sched/clock.c
@@ -53,6 +53,7 @@
*
*/
#include "sched.h"
+#include <linux/sched_clock.h>
/*
* Scheduler clock - returns current time in nanosec units.
@@ -66,12 +67,7 @@ unsigned long long __weak sched_clock(void)
}
EXPORT_SYMBOL_GPL(sched_clock);
-__read_mostly int sched_clock_running;
-
-void sched_clock_init(void)
-{
- sched_clock_running = 1;
-}
+static DEFINE_STATIC_KEY_FALSE(sched_clock_running);
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
/*
@@ -195,17 +191,40 @@ void clear_sched_clock_stable(void)
smp_mb(); /* matches sched_clock_init_late() */
- if (sched_clock_running == 2)
+ if (static_key_count(&sched_clock_running.key) == 2)
__clear_sched_clock_stable();
}
+static void __sched_clock_gtod_offset(void)
+{
+ struct sched_clock_data *scd = this_scd();
+
+ __scd_stamp(scd);
+ __gtod_offset = (scd->tick_raw + __sched_clock_offset) - scd->tick_gtod;
+}
+
+void __init sched_clock_init(void)
+{
+ /*
+ * Set __gtod_offset such that once we mark sched_clock_running,
+ * sched_clock_tick() continues where sched_clock() left off.
+ *
+ * Even if TSC is buggered, we're still UP at this point so it
+ * can't really be out of sync.
+ */
+ local_irq_disable();
+ __sched_clock_gtod_offset();
+ local_irq_enable();
+
+ static_branch_inc(&sched_clock_running);
+}
/*
* We run this as late_initcall() such that it runs after all built-in drivers,
* notably: acpi_processor and intel_idle, which can mark the TSC as unstable.
*/
static int __init sched_clock_init_late(void)
{
- sched_clock_running = 2;
+ static_branch_inc(&sched_clock_running);
/*
* Ensure that it is impossible to not do a static_key update.
*
@@ -350,8 +369,8 @@ u64 sched_clock_cpu(int cpu)
if (sched_clock_stable())
return sched_clock() + __sched_clock_offset;
- if (unlikely(!sched_clock_running))
- return 0ull;
+ if (!static_branch_unlikely(&sched_clock_running))
+ return sched_clock();
preempt_disable_notrace();
scd = cpu_sdc(cpu);
@@ -373,7 +392,7 @@ void sched_clock_tick(void)
if (sched_clock_stable())
return;
- if (unlikely(!sched_clock_running))
+ if (!static_branch_unlikely(&sched_clock_running))
return;
lockdep_assert_irqs_disabled();
@@ -385,8 +404,6 @@ void sched_clock_tick(void)
void sched_clock_tick_stable(void)
{
- u64 gtod, clock;
-
if (!sched_clock_stable())
return;
@@ -398,9 +415,7 @@ void sched_clock_tick_stable(void)
* TSC to be unstable, any computation will be computing crap.
*/
local_irq_disable();
- gtod = ktime_get_ns();
- clock = sched_clock();
- __gtod_offset = (clock + __sched_clock_offset) - gtod;
+ __sched_clock_gtod_offset();
local_irq_enable();
}
@@ -434,9 +449,17 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
#else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
+void __init sched_clock_init(void)
+{
+ static_branch_inc(&sched_clock_running);
+ local_irq_disable();
+ generic_sched_clock_init();
+ local_irq_enable();
+}
+
u64 sched_clock_cpu(int cpu)
{
- if (unlikely(!sched_clock_running))
+ if (!static_branch_unlikely(&sched_clock_running))
return 0;
return sched_clock();
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d17d99778356..c45de46fdf10 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5916,7 +5916,6 @@ void __init sched_init(void)
int i, j;
unsigned long alloc_size = 0, ptr;
- sched_clock_init();
wait_bit_init();
#ifdef CONFIG_FAIR_GROUP_SCHED
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 870d4f3da285..60caf1fb94e0 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -622,8 +622,6 @@ void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
#undef PU
}
-extern __read_mostly int sched_clock_running;
-
static void print_cpu(struct seq_file *m, int cpu)
{
struct rq *rq = cpu_rq(cpu);
diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
index 2d8f05aad442..cbc72c2c1fca 100644
--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -237,7 +237,7 @@ sched_clock_register(u64 (*read)(void), int bits, unsigned long rate)
pr_debug("Registered %pF as sched_clock source\n", read);
}
-void __init sched_clock_postinit(void)
+void __init generic_sched_clock_init(void)
{
/*
* If no sched_clock() function has been provided at that point,
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index d9e659a12c76..f3b22f456fac 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -17,6 +17,7 @@
#include <linux/nmi.h>
#include <linux/sched.h>
#include <linux/sched/loadavg.h>
+#include <linux/sched/clock.h>
#include <linux/syscore_ops.h>
#include <linux/clocksource.h>
#include <linux/jiffies.h>
@@ -1505,18 +1506,23 @@ void __weak read_persistent_clock64(struct timespec64 *ts64)
}
/**
- * read_boot_clock64 - Return time of the system start.
+ * read_persistent_wall_and_boot_offset - Read persistent clock, and also offset
+ * from the boot.
*
* Weak dummy function for arches that do not yet support it.
- * Function to read the exact time the system has been started.
- * Returns a timespec64 with tv_sec=0 and tv_nsec=0 if unsupported.
- *
- * XXX - Do be sure to remove it once all arches implement it.
+ * wall_time - current time as returned by persistent clock
+ * boot_offset - offset that is defined as wall_time - boot_time
+ * The default function calculates offset based on the current value of
+ * local_clock(). This way architectures that support sched_clock() but don't
+ * support dedicated boot time clock will provide the best estimate of the
+ * boot time.
*/
-void __weak read_boot_clock64(struct timespec64 *ts)
+void __weak __init
+read_persistent_wall_and_boot_offset(struct timespec64 *wall_time,
+ struct timespec64 *boot_offset)
{
- ts->tv_sec = 0;
- ts->tv_nsec = 0;
+ read_persistent_clock64(wall_time);
+ *boot_offset = ns_to_timespec64(local_clock());
}
/*
@@ -1542,28 +1548,29 @@ static bool persistent_clock_exists;
*/
void __init timekeeping_init(void)
{
+ struct timespec64 wall_time, boot_offset, wall_to_mono;
struct timekeeper *tk = &tk_core.timekeeper;
struct clocksource *clock;
unsigned long flags;
- struct timespec64 now, boot, tmp;
-
- read_persistent_clock64(&now);
- if (!timespec64_valid_strict(&now)) {
- pr_warn("WARNING: Persistent clock returned invalid value!\n"
- " Check your CMOS/BIOS settings.\n");
- now.tv_sec = 0;
- now.tv_nsec = 0;
- } else if (now.tv_sec || now.tv_nsec)
- persistent_clock_exists = true;
- read_boot_clock64(&boot);
- if (!timespec64_valid_strict(&boot)) {
- pr_warn("WARNING: Boot clock returned invalid value!\n"
- " Check your CMOS/BIOS settings.\n");
- boot.tv_sec = 0;
- boot.tv_nsec = 0;
+ read_persistent_wall_and_boot_offset(&wall_time, &boot_offset);
+ if (timespec64_valid_strict(&wall_time) &&
+ timespec64_to_ns(&wall_time) > 0) {
+ persistent_clock_exists = true;
+ } else if (timespec64_to_ns(&wall_time) != 0) {
+ pr_warn("Persistent clock returned invalid value");
+ wall_time = (struct timespec64){0};
}
+ if (timespec64_compare(&wall_time, &boot_offset) < 0)
+ boot_offset = (struct timespec64){0};
+
+ /*
+ * We want set wall_to_mono, so the following is true:
+ * wall time + wall_to_mono = boot time
+ */
+ wall_to_mono = timespec64_sub(boot_offset, wall_time);
+
raw_spin_lock_irqsave(&timekeeper_lock, flags);
write_seqcount_begin(&tk_core.seq);
ntp_init();
@@ -1573,13 +1580,10 @@ void __init timekeeping_init(void)
clock->enable(clock);
tk_setup_internals(tk, clock);
- tk_set_xtime(tk, &now);
+ tk_set_xtime(tk, &wall_time);
tk->raw_sec = 0;
- if (boot.tv_sec == 0 && boot.tv_nsec == 0)
- boot = tk_xtime(tk);
- set_normalized_timespec64(&tmp, -boot.tv_sec, -boot.tv_nsec);
- tk_set_wall_to_mono(tk, tmp);
+ tk_set_wall_to_mono(tk, wall_to_mono);
timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET);