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aa5e65dc08
We can see that "Time namespaces are not supported" on LoongArch: (1) clone3 test # cd tools/testing/selftests/clone3 && make && ./clone3 ... # Time namespaces are not supported ok 18 # SKIP Skipping clone3() with CLONE_NEWTIME # Totals: pass:17 fail:0 xfail:0 xpass:0 skip:1 error:0 (2) timens test # cd tools/testing/selftests/timens && make && ./timens ... 1..0 # SKIP Time namespaces are not supported On LoongArch the current kernel does not support CONFIG_TIME_NS which depends on GENERIC_VDSO_TIME_NS, select GENERIC_VDSO_TIME_NS to enable CONFIG_TIME_NS to build kernel/time/namespace.c. Additionally, it needs to define some arch-dependent functions for the timens, such as __arch_get_timens_vdso_data(), arch_get_vdso_data() and vdso_join_timens(). At the same time, modify the layout of vvar to use one page size for generic vdso data, expand another page size for timens vdso data and assign LOONGARCH_VDSO_DATA_SIZE (maybe exceeds a page size if expand in the future) for loongarch vdso data, at last add the callback function vvar_fault() and modify stack_top(). With this patch under CONFIG_TIME_NS: (1) clone3 test # cd tools/testing/selftests/clone3 && make && ./clone3 ... ok 18 [739] Result (0) matches expectation (0) # Totals: pass:18 fail:0 xfail:0 xpass:0 skip:0 error:0 (2) timens test # cd tools/testing/selftests/timens && make && ./timens ... # Totals: pass:10 fail:0 xfail:0 xpass:0 skip:0 error:0 Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Author: Huacai Chen <chenhuacai@loongson.cn>
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*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef __ASM_VDSO_GETTIMEOFDAY_H
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#define __ASM_VDSO_GETTIMEOFDAY_H
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#ifndef __ASSEMBLY__
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#include <asm/unistd.h>
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#include <asm/vdso/vdso.h>
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#define VDSO_HAS_CLOCK_GETRES 1
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static __always_inline long gettimeofday_fallback(
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struct __kernel_old_timeval *_tv,
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struct timezone *_tz)
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{
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register struct __kernel_old_timeval *tv asm("a0") = _tv;
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register struct timezone *tz asm("a1") = _tz;
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register long nr asm("a7") = __NR_gettimeofday;
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register long ret asm("a0");
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asm volatile(
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" syscall 0\n"
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: "+r" (ret)
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: "r" (nr), "r" (tv), "r" (tz)
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
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"$t8", "memory");
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return ret;
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}
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static __always_inline long clock_gettime_fallback(
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clockid_t _clkid,
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struct __kernel_timespec *_ts)
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{
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register clockid_t clkid asm("a0") = _clkid;
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register struct __kernel_timespec *ts asm("a1") = _ts;
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register long nr asm("a7") = __NR_clock_gettime;
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register long ret asm("a0");
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asm volatile(
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" syscall 0\n"
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: "+r" (ret)
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: "r" (nr), "r" (clkid), "r" (ts)
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
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"$t8", "memory");
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return ret;
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}
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static __always_inline int clock_getres_fallback(
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clockid_t _clkid,
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struct __kernel_timespec *_ts)
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{
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register clockid_t clkid asm("a0") = _clkid;
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register struct __kernel_timespec *ts asm("a1") = _ts;
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register long nr asm("a7") = __NR_clock_getres;
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register long ret asm("a0");
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asm volatile(
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" syscall 0\n"
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: "+r" (ret)
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: "r" (nr), "r" (clkid), "r" (ts)
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
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"$t8", "memory");
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return ret;
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}
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static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
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const struct vdso_data *vd)
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{
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uint64_t count;
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__asm__ __volatile__(
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" rdtime.d %0, $zero\n"
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: "=r" (count));
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return count;
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}
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static inline bool loongarch_vdso_hres_capable(void)
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{
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return true;
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}
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#define __arch_vdso_hres_capable loongarch_vdso_hres_capable
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static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
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{
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return (const struct vdso_data *)get_vdso_data();
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}
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#ifdef CONFIG_TIME_NS
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static __always_inline
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const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
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{
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return (const struct vdso_data *)(get_vdso_data() + VVAR_TIMENS_PAGE_OFFSET * PAGE_SIZE);
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}
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#endif
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
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