[PATCH v2 2/2] x86: convert x86_platform_ops to timespec64

From: Arnd Bergmann
Date: Thu Oct 19 2017 - 07:00:23 EST

The x86 platform operations are fairly isolated, so we can
change them from using timespec to timespec64. I checked that
All the users and callers are safe, and there is only one
critical function that is broken beyond 2106:

pvclock_read_wallclock() uses a 32-bit number of seconds since
the epoch to communicate the boot time between host and guest
in a virtual environment. This will work until 2106, but we
should ideally find a replacement anyway. I've added a comment
about it there.

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
v2 changes:
- move comment block (Boris)
- remove unnecessary type cast (Boris)
- fix format string (0day bot)
- fix include order (0day bot)
---
arch/x86/include/asm/intel_mid_vrtc.h | 4 ++--
arch/x86/include/asm/mc146818rtc.h | 4 ++--
arch/x86/include/asm/pvclock.h | 2 +-
arch/x86/include/asm/x86_init.h | 7 +++----
arch/x86/kernel/kvmclock.c | 4 ++--
arch/x86/kernel/pvclock.c | 15 +++++++++++----
arch/x86/kernel/rtc.c | 16 ++++++++--------
arch/x86/platform/intel-mid/intel_mid_vrtc.c | 12 ++++++------
arch/x86/xen/time.c | 10 +++++-----
9 files changed, 40 insertions(+), 34 deletions(-)

diff --git a/arch/x86/include/asm/intel_mid_vrtc.h b/arch/x86/include/asm/intel_mid_vrtc.h
index 86ff4685c409..19202320f0be 100644
--- a/arch/x86/include/asm/intel_mid_vrtc.h
+++ b/arch/x86/include/asm/intel_mid_vrtc.h
@@ -3,7 +3,7 @@

extern unsigned char vrtc_cmos_read(unsigned char reg);
extern void vrtc_cmos_write(unsigned char val, unsigned char reg);
-extern void vrtc_get_time(struct timespec *now);
-extern int vrtc_set_mmss(const struct timespec *now);
+extern void vrtc_get_time(struct timespec64 *now);
+extern int vrtc_set_mmss(const struct timespec64 *now);

#endif
diff --git a/arch/x86/include/asm/mc146818rtc.h b/arch/x86/include/asm/mc146818rtc.h
index 24acd9ba7837..1b574e5eb3b2 100644
--- a/arch/x86/include/asm/mc146818rtc.h
+++ b/arch/x86/include/asm/mc146818rtc.h
@@ -94,8 +94,8 @@ static inline unsigned char current_lock_cmos_reg(void)
unsigned char rtc_cmos_read(unsigned char addr);
void rtc_cmos_write(unsigned char val, unsigned char addr);

-extern int mach_set_rtc_mmss(const struct timespec *now);
-extern void mach_get_cmos_time(struct timespec *now);
+extern int mach_set_rtc_mmss(const struct timespec64 *now);
+extern void mach_get_cmos_time(struct timespec64 *now);

#define RTC_IRQ 8

diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h
index 448cfe1b48cf..fc3138fd3aff 100644
--- a/arch/x86/include/asm/pvclock.h
+++ b/arch/x86/include/asm/pvclock.h
@@ -20,7 +20,7 @@ void pvclock_set_flags(u8 flags);
unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src);
void pvclock_read_wallclock(struct pvclock_wall_clock *wall,
struct pvclock_vcpu_time_info *vcpu,
- struct timespec *ts);
+ struct timespec64 *ts);
void pvclock_resume(void);

void pvclock_touch_watchdogs(void);
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index f45acdf45957..847bdefa7807 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -1,6 +1,7 @@
#ifndef _ASM_X86_PLATFORM_H
#define _ASM_X86_PLATFORM_H

+#include <linux/time64.h>
#include <asm/bootparam.h>

struct mpc_bus;
@@ -141,8 +142,6 @@ struct x86_cpuinit_ops {
void (*fixup_cpu_id)(struct cpuinfo_x86 *c, int node);
};

-struct timespec;
-
/**
* struct x86_legacy_devices - legacy x86 devices
*
@@ -223,8 +222,8 @@ struct x86_legacy_features {
struct x86_platform_ops {
unsigned long (*calibrate_cpu)(void);
unsigned long (*calibrate_tsc)(void);
- void (*get_wallclock)(struct timespec *ts);
- int (*set_wallclock)(const struct timespec *ts);
+ void (*get_wallclock)(struct timespec64 *ts);
+ int (*set_wallclock)(const struct timespec64 *ts);
void (*iommu_shutdown)(void);
bool (*is_untracked_pat_range)(u64 start, u64 end);
void (*nmi_init)(void);
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index d88967659098..01c76e8cd4be 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -58,7 +58,7 @@ EXPORT_SYMBOL_GPL(pvclock_pvti_cpu0_va);
* have elapsed since the hypervisor wrote the data. So we try to account for
* that with system time
*/
-static void kvm_get_wallclock(struct timespec *now)
+static void kvm_get_wallclock(struct timespec64 *now)
{
struct pvclock_vcpu_time_info *vcpu_time;
int low, high;
@@ -77,7 +77,7 @@ static void kvm_get_wallclock(struct timespec *now)
put_cpu();
}

-static int kvm_set_wallclock(const struct timespec *now)
+static int kvm_set_wallclock(const struct timespec64 *now)
{
return -1;
}
diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c
index 5c3f6d6a5078..013bef851664 100644
--- a/arch/x86/kernel/pvclock.c
+++ b/arch/x86/kernel/pvclock.c
@@ -121,26 +121,33 @@ u64 pvclock_clocksource_read(struct pvclock_vcpu_time_info *src)

void pvclock_read_wallclock(struct pvclock_wall_clock *wall_clock,
struct pvclock_vcpu_time_info *vcpu_time,
- struct timespec *ts)
+ struct timespec64 *ts)
{
u32 version;
u64 delta;
- struct timespec now;
+ struct timespec64 now;

/* get wallclock at system boot */
do {
version = wall_clock->version;
rmb(); /* fetch version before time */
+ /*
+ * Note: wall_clock->sec is a u32 value, so it can
+ * only store dates between 1970 and 2106. To allow
+ * times beyond that, we need to create a new hypercall
+ * interface with an extended pvclock_wall_clock structure
+ * like ARM has.
+ */
now.tv_sec = wall_clock->sec;
now.tv_nsec = wall_clock->nsec;
rmb(); /* fetch time before checking version */
} while ((wall_clock->version & 1) || (version != wall_clock->version));

delta = pvclock_clocksource_read(vcpu_time); /* time since system boot */
- delta += now.tv_sec * (u64)NSEC_PER_SEC + now.tv_nsec;
+ delta += now.tv_sec * NSEC_PER_SEC + now.tv_nsec;

now.tv_nsec = do_div(delta, NSEC_PER_SEC);
now.tv_sec = delta;

- set_normalized_timespec(ts, now.tv_sec, now.tv_nsec);
+ set_normalized_timespec64(ts, now.tv_sec, now.tv_nsec);
}
diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 5b21cb7d84d6..f5a687c38c6d 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -38,13 +38,13 @@ EXPORT_SYMBOL(rtc_lock);
* jump to the next second precisely 500 ms later. Check the Motorola
* MC146818A or Dallas DS12887 data sheet for details.
*/
-int mach_set_rtc_mmss(const struct timespec *now)
+int mach_set_rtc_mmss(const struct timespec64 *now)
{
- unsigned long nowtime = now->tv_sec;
+ time64_t nowtime = now->tv_sec;
struct rtc_time tm;
int retval = 0;

- rtc_time_to_tm(nowtime, &tm);
+ rtc_time64_to_tm(nowtime, &tm);
if (!rtc_valid_tm(&tm)) {
retval = mc146818_set_time(&tm);
if (retval)
@@ -52,14 +52,14 @@ int mach_set_rtc_mmss(const struct timespec *now)
__func__, retval);
} else {
printk(KERN_ERR
- "%s: Invalid RTC value: write of %lx to RTC failed\n",
+ "%s: Invalid RTC value: write of %llx to RTC failed\n",
__func__, nowtime);
retval = -EINVAL;
}
return retval;
}

-void mach_get_cmos_time(struct timespec *now)
+void mach_get_cmos_time(struct timespec64 *now)
{
unsigned int status, year, mon, day, hour, min, sec, century = 0;
unsigned long flags;
@@ -117,7 +117,7 @@ void mach_get_cmos_time(struct timespec *now)
} else
year += CMOS_YEARS_OFFS;

- now->tv_sec = mktime(year, mon, day, hour, min, sec);
+ now->tv_sec = mktime64(year, mon, day, hour, min, sec);
now->tv_nsec = 0;
}

@@ -144,13 +144,13 @@ void rtc_cmos_write(unsigned char val, unsigned char addr)
}
EXPORT_SYMBOL(rtc_cmos_write);

-int update_persistent_clock(struct timespec now)
+int update_persistent_clock64(struct timespec64 now)
{
return x86_platform.set_wallclock(&now);
}

/* not static: needed by APM */
-void read_persistent_clock(struct timespec *ts)
+void read_persistent_clock64(struct timespec64 *ts)
{
x86_platform.get_wallclock(ts);
}
diff --git a/arch/x86/platform/intel-mid/intel_mid_vrtc.c b/arch/x86/platform/intel-mid/intel_mid_vrtc.c
index 58024862a7eb..a52914aa3b6c 100644
--- a/arch/x86/platform/intel-mid/intel_mid_vrtc.c
+++ b/arch/x86/platform/intel-mid/intel_mid_vrtc.c
@@ -57,7 +57,7 @@ void vrtc_cmos_write(unsigned char val, unsigned char reg)
}
EXPORT_SYMBOL_GPL(vrtc_cmos_write);

-void vrtc_get_time(struct timespec *now)
+void vrtc_get_time(struct timespec64 *now)
{
u8 sec, min, hour, mday, mon;
unsigned long flags;
@@ -83,18 +83,18 @@ void vrtc_get_time(struct timespec *now)
pr_info("vRTC: sec: %d min: %d hour: %d day: %d "
"mon: %d year: %d\n", sec, min, hour, mday, mon, year);

- now->tv_sec = mktime(year, mon, mday, hour, min, sec);
+ now->tv_sec = mktime64(year, mon, mday, hour, min, sec);
now->tv_nsec = 0;
}

-int vrtc_set_mmss(const struct timespec *now)
+int vrtc_set_mmss(const struct timespec64 *now)
{
unsigned long flags;
struct rtc_time tm;
int year;
int retval = 0;

- rtc_time_to_tm(now->tv_sec, &tm);
+ rtc_time64_to_tm(now->tv_sec, &tm);
if (!rtc_valid_tm(&tm) && tm.tm_year >= 72) {
/*
* tm.year is the number of years since 1900, and the
@@ -110,8 +110,8 @@ int vrtc_set_mmss(const struct timespec *now)
vrtc_cmos_write(tm.tm_sec, RTC_SECONDS);
spin_unlock_irqrestore(&rtc_lock, flags);
} else {
- pr_err("%s: Invalid vRTC value: write of %lx to vRTC failed\n",
- __func__, now->tv_sec);
+ pr_err("%s: Invalid vRTC value: write of %llx to vRTC failed\n",
+ __func__, (s64)now->tv_sec);
retval = -EINVAL;
}
return retval;
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 1ecb05db3632..b1eed21a7b46 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -56,7 +56,7 @@ static u64 xen_clocksource_get_cycles(struct clocksource *cs)
return xen_clocksource_read();
}

-static void xen_read_wallclock(struct timespec *ts)
+static void xen_read_wallclock(struct timespec64 *ts)
{
struct shared_info *s = HYPERVISOR_shared_info;
struct pvclock_wall_clock *wall_clock = &(s->wc);
@@ -67,12 +67,12 @@ static void xen_read_wallclock(struct timespec *ts)
put_cpu_var(xen_vcpu);
}

-static void xen_get_wallclock(struct timespec *now)
+static void xen_get_wallclock(struct timespec64 *now)
{
xen_read_wallclock(now);
}

-static int xen_set_wallclock(const struct timespec *now)
+static int xen_set_wallclock(const struct timespec64 *now)
{
return -1;
}
@@ -373,7 +373,7 @@ static const struct pv_time_ops xen_time_ops __initconst = {
static void __init xen_time_init(void)
{
int cpu = smp_processor_id();
- struct timespec tp;
+ struct timespec64 tp;

/* As Dom0 is never moved, no penalty on using TSC there */
if (xen_initial_domain())
@@ -391,7 +391,7 @@ static void __init xen_time_init(void)

/* Set initial system time with full resolution */
xen_read_wallclock(&tp);
- do_settimeofday(&tp);
+ do_settimeofday64(&tp);

setup_force_cpu_cap(X86_FEATURE_TSC);

--
2.9.0