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x86, vdso: Make vsyscall_gtod_data handling x86 generic

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This patch move the vsyscall_gtod_data handling out of vsyscall_64.c
into an additonal file vsyscall_gtod.c to make the functionality
available for x86 32 bit kernel.

It also adds a new vsyscall_32.c which setup the VVAR page.

Reviewed-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Link: http://lkml.kernel.org/r/1395094933-14252-2-git-send-email-stefani@seibold.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Stefani Seibold 2014-03-17 23:22:01 +01:00 committed by H. Peter Anvin
parent 1f2cbcf648
commit d2312e3379
10 changed files with 72 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/Kconfig
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@ -107,9 +107,9 @@ config X86
select HAVE_ARCH_SOFT_DIRTY
select CLOCKSOURCE_WATCHDOG
select GENERIC_CLOCKEVENTS
select ARCH_CLOCKSOURCE_DATA if X86_64
select ARCH_CLOCKSOURCE_DATA
select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
select GENERIC_TIME_VSYSCALL if X86_64
select GENERIC_TIME_VSYSCALL
select KTIME_SCALAR if X86_32
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER

4
arch/x86/include/asm/clocksource.h
View File

@ -3,8 +3,6 @@
#ifndef _ASM_X86_CLOCKSOURCE_H
#define _ASM_X86_CLOCKSOURCE_H
#ifdef CONFIG_X86_64
#define VCLOCK_NONE 0 /* No vDSO clock available. */
#define VCLOCK_TSC 1 /* vDSO should use vread_tsc. */
#define VCLOCK_HPET 2 /* vDSO should use vread_hpet. */
@ -14,6 +12,4 @@ struct arch_clocksource_data {
int vclock_mode;
};
#endif /* CONFIG_X86_64 */
#endif /* _ASM_X86_CLOCKSOURCE_H */

12
arch/x86/include/asm/vvar.h
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@ -16,9 +16,6 @@
* you mess up, the linker will catch it.)
*/
/* Base address of vvars. This is not ABI. */
#define VVAR_ADDRESS (-10*1024*1024 - 4096)
#if defined(__VVAR_KERNEL_LDS)
/* The kernel linker script defines its own magic to put vvars in the
@ -29,6 +26,15 @@
#else
extern char __vvar_page;
/* Base address of vvars. This is not ABI. */
#ifdef CONFIG_X86_64
#define VVAR_ADDRESS (-10*1024*1024 - 4096)
#else
#define VVAR_ADDRESS (&__vvar_page)
#endif
#define DECLARE_VVAR(offset, type, name) \
static type const * const vvaraddr_ ## name = \
(void *)(VVAR_ADDRESS + (offset));

2
arch/x86/kernel/Makefile
View File

@ -26,7 +26,7 @@ obj-$(CONFIG_IRQ_WORK) += irq_work.o
obj-y += probe_roms.o
obj-$(CONFIG_X86_32) += i386_ksyms_32.o
obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o
obj-y += syscall_$(BITS).o
obj-y += syscall_$(BITS).o vsyscall_gtod.o
obj-$(CONFIG_X86_64) += vsyscall_64.o
obj-$(CONFIG_X86_64) += vsyscall_emu_64.o
obj-$(CONFIG_SYSFS) += ksysfs.o

2
arch/x86/kernel/hpet.c
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@ -752,9 +752,7 @@ static struct clocksource clocksource_hpet = {
.mask = HPET_MASK,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.resume = hpet_resume_counter,
#ifdef CONFIG_X86_64
.archdata = { .vclock_mode = VCLOCK_HPET },
#endif
};
static int hpet_clocksource_register(void)

2
arch/x86/kernel/tsc.c
View File

@ -985,9 +985,7 @@ static struct clocksource clocksource_tsc = {
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS |
CLOCK_SOURCE_MUST_VERIFY,
#ifdef CONFIG_X86_64
.archdata = { .vclock_mode = VCLOCK_TSC },
#endif
};
void mark_tsc_unstable(char *reason)

3
arch/x86/kernel/vmlinux.lds.S
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@ -147,7 +147,6 @@ SECTIONS
_edata = .;
} :data
#ifdef CONFIG_X86_64
. = ALIGN(PAGE_SIZE);
__vvar_page = .;
@ -169,8 +168,6 @@ SECTIONS
. = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
#endif /* CONFIG_X86_64 */
/* Init code and data - will be freed after init */
. = ALIGN(PAGE_SIZE);
.init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {

45
arch/x86/kernel/vsyscall_64.c
View File

@ -47,14 +47,12 @@
#include <asm/segment.h>
#include <asm/desc.h>
#include <asm/topology.h>
#include <asm/vgtod.h>
#include <asm/traps.h>
#define CREATE_TRACE_POINTS
#include "vsyscall_trace.h"
DEFINE_VVAR(int, vgetcpu_mode);
DEFINE_VVAR(struct vsyscall_gtod_data, vsyscall_gtod_data);
static enum { EMULATE, NATIVE, NONE } vsyscall_mode = EMULATE;
@ -77,48 +75,6 @@ static int __init vsyscall_setup(char *str)
}
early_param("vsyscall", vsyscall_setup);
void update_vsyscall_tz(void)
{
vsyscall_gtod_data.sys_tz = sys_tz;
}
void update_vsyscall(struct timekeeper *tk)
{
struct vsyscall_gtod_data *vdata = &vsyscall_gtod_data;
write_seqcount_begin(&vdata->seq);
/* copy vsyscall data */
vdata->clock.vclock_mode = tk->clock->archdata.vclock_mode;
vdata->clock.cycle_last = tk->clock->cycle_last;
vdata->clock.mask = tk->clock->mask;
vdata->clock.mult = tk->mult;
vdata->clock.shift = tk->shift;
vdata->wall_time_sec = tk->xtime_sec;
vdata->wall_time_snsec = tk->xtime_nsec;
vdata->monotonic_time_sec = tk->xtime_sec
+ tk->wall_to_monotonic.tv_sec;
vdata->monotonic_time_snsec = tk->xtime_nsec
+ (tk->wall_to_monotonic.tv_nsec
<< tk->shift);
while (vdata->monotonic_time_snsec >=
(((u64)NSEC_PER_SEC) << tk->shift)) {
vdata->monotonic_time_snsec -=
((u64)NSEC_PER_SEC) << tk->shift;
vdata->monotonic_time_sec++;
}
vdata->wall_time_coarse.tv_sec = tk->xtime_sec;
vdata->wall_time_coarse.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
vdata->monotonic_time_coarse = timespec_add(vdata->wall_time_coarse,
tk->wall_to_monotonic);
write_seqcount_end(&vdata->seq);
}
static void warn_bad_vsyscall(const char *level, struct pt_regs *regs,
const char *message)
{
@ -374,7 +330,6 @@ void __init map_vsyscall(void)
{
extern char __vsyscall_page;
unsigned long physaddr_vsyscall = __pa_symbol(&__vsyscall_page);
extern char __vvar_page;
unsigned long physaddr_vvar_page = __pa_symbol(&__vvar_page);
__set_fixmap(VSYSCALL_FIRST_PAGE, physaddr_vsyscall,

59
arch/x86/kernel/vsyscall_gtod.c Normal file
View File

@ -0,0 +1,59 @@
/*
* Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
* Copyright 2003 Andi Kleen, SuSE Labs.
*
* Modified for x86 32 bit architecture by
* Stefani Seibold <stefani@seibold.net>
*
* Thanks to hpa@transmeta.com for some useful hint.
* Special thanks to Ingo Molnar for his early experience with
* a different vsyscall implementation for Linux/IA32 and for the name.
*
*/
#include <linux/timekeeper_internal.h>
#include <asm/vgtod.h>
DEFINE_VVAR(struct vsyscall_gtod_data, vsyscall_gtod_data);
void update_vsyscall_tz(void)
{
vsyscall_gtod_data.sys_tz = sys_tz;
}
void update_vsyscall(struct timekeeper *tk)
{
struct vsyscall_gtod_data *vdata = &vsyscall_gtod_data;
write_seqcount_begin(&vdata->seq);
/* copy vsyscall data */
vdata->clock.vclock_mode = tk->clock->archdata.vclock_mode;
vdata->clock.cycle_last = tk->clock->cycle_last;
vdata->clock.mask = tk->clock->mask;
vdata->clock.mult = tk->mult;
vdata->clock.shift = tk->shift;
vdata->wall_time_sec = tk->xtime_sec;
vdata->wall_time_snsec = tk->xtime_nsec;
vdata->monotonic_time_sec = tk->xtime_sec
+ tk->wall_to_monotonic.tv_sec;
vdata->monotonic_time_snsec = tk->xtime_nsec
+ (tk->wall_to_monotonic.tv_nsec
<< tk->shift);
while (vdata->monotonic_time_snsec >=
(((u64)NSEC_PER_SEC) << tk->shift)) {
vdata->monotonic_time_snsec -=
((u64)NSEC_PER_SEC) << tk->shift;
vdata->monotonic_time_sec++;
}
vdata->wall_time_coarse.tv_sec = tk->xtime_sec;
vdata->wall_time_coarse.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
vdata->monotonic_time_coarse = timespec_add(vdata->wall_time_coarse,
tk->wall_to_monotonic);
write_seqcount_end(&vdata->seq);
}

2
arch/x86/tools/relocs.c
View File

@ -69,8 +69,8 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = {
"__per_cpu_load|"
"init_per_cpu__.*|"
"__end_rodata_hpage_align|"
"__vvar_page|"
#endif
"__vvar_page|"
"_end)$"
};