mirror of https://gitee.com/openkylin/linux.git
mips: Add support for generic vDSO
The mips vDSO library requires some adaptations to take advantage of the newly introduced generic vDSO library. Introduce the following changes: - Modification of vdso.c to be compliant with the common vdso datapage - Use of lib/vdso for gettimeofday Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> [paul.burton@mips.com: Prepend $(src) to config-n32-o32-env.c path.] Signed-off-by: Paul Burton <paul.burton@mips.com>
This commit is contained in:
Vincenzo Frascino
Paul Burton
parent
c2aeaaea17
commit
24640f233b
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@ -22,6 +22,7 @@ config MIPS
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select GENERIC_CLOCKEVENTS
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select GENERIC_CMOS_UPDATE
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select GENERIC_CPU_AUTOPROBE
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select GENERIC_GETTIMEOFDAY
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select GENERIC_IOMAP
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select GENERIC_IRQ_PROBE
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select GENERIC_IRQ_SHOW
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@ -74,6 +75,7 @@ config MIPS
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select HAVE_STACKPROTECTOR
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select HAVE_SYSCALL_TRACEPOINTS
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select HAVE_VIRT_CPU_ACCOUNTING_GEN if 64BIT || !SMP
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select HAVE_GENERIC_VDSO
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select IRQ_FORCED_THREADING
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select ISA if EISA
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select MODULES_USE_ELF_RELA if MODULES && 64BIT
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@ -8,6 +8,7 @@
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#define __ASM_VDSO_H
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#include <linux/mm_types.h>
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#include <vdso/datapage.h>
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#include <asm/barrier.h>
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@ -49,84 +50,9 @@ extern struct mips_vdso_image vdso_image_o32;
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extern struct mips_vdso_image vdso_image_n32;
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#endif
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/**
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* union mips_vdso_data - Data provided by the kernel for the VDSO.
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* @xtime_sec: Current real time (seconds part).
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* @xtime_nsec: Current real time (nanoseconds part, shifted).
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* @wall_to_mono_sec: Wall-to-monotonic offset (seconds part).
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* @wall_to_mono_nsec: Wall-to-monotonic offset (nanoseconds part).
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* @seq_count: Counter to synchronise updates (odd = updating).
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* @cs_shift: Clocksource shift value.
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* @clock_mode: Clocksource to use for time functions.
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* @cs_mult: Clocksource multiplier value.
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* @cs_cycle_last: Clock cycle value at last update.
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* @cs_mask: Clocksource mask value.
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* @tz_minuteswest: Minutes west of Greenwich (from timezone).
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* @tz_dsttime: Type of DST correction (from timezone).
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*
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* This structure contains data needed by functions within the VDSO. It is
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* populated by the kernel and mapped read-only into user memory. The time
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* fields are mirrors of internal data from the timekeeping infrastructure.
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*
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* Note: Care should be taken when modifying as the layout must remain the same
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* for both 64- and 32-bit (for 32-bit userland on 64-bit kernel).
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*/
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union mips_vdso_data {
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struct {
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u64 xtime_sec;
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u64 xtime_nsec;
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u64 wall_to_mono_sec;
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u64 wall_to_mono_nsec;
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u32 seq_count;
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u32 cs_shift;
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u8 clock_mode;
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u32 cs_mult;
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u64 cs_cycle_last;
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u64 cs_mask;
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s32 tz_minuteswest;
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s32 tz_dsttime;
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};
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struct vdso_data data[CS_BASES];
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u8 page[PAGE_SIZE];
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};
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static inline u32 vdso_data_read_begin(const union mips_vdso_data *data)
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{
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u32 seq;
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while (true) {
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seq = READ_ONCE(data->seq_count);
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if (likely(!(seq & 1))) {
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/* Paired with smp_wmb() in vdso_data_write_*(). */
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smp_rmb();
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return seq;
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}
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cpu_relax();
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}
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}
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static inline bool vdso_data_read_retry(const union mips_vdso_data *data,
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u32 start_seq)
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{
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/* Paired with smp_wmb() in vdso_data_write_*(). */
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smp_rmb();
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return unlikely(data->seq_count != start_seq);
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}
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static inline void vdso_data_write_begin(union mips_vdso_data *data)
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{
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++data->seq_count;
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/* Ensure sequence update is written before other data page values. */
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smp_wmb();
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}
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static inline void vdso_data_write_end(union mips_vdso_data *data)
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{
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/* Ensure data values are written before updating sequence again. */
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smp_wmb();
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++data->seq_count;
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}
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#endif /* __ASM_VDSO_H */
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@ -0,0 +1,151 @@
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/*
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* Copyright (C) 2018 ARM Limited
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* Copyright (C) 2015 Imagination Technologies
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* Author: Alex Smith <alex.smith@imgtec.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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 <linux/compiler.h>
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#include <linux/time.h>
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#include <asm/vdso/vdso.h>
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#include <asm/clocksource.h>
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#include <asm/io.h>
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#include <asm/unistd.h>
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#include <asm/vdso.h>
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#ifdef CONFIG_MIPS_CLOCK_VSYSCALL
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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 timezone *tz asm("a1") = _tz;
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register struct __kernel_old_timeval *tv asm("a0") = _tv;
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register long ret asm("v0");
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register long nr asm("v0") = __NR_gettimeofday;
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register long error asm("a3");
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asm volatile(
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" syscall\n"
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: "=r" (ret), "=r" (error)
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: "r" (tv), "r" (tz), "r" (nr)
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
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"$14", "$15", "$24", "$25", "hi", "lo", "memory");
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return error ? -ret : ret;
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}
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#else
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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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return -1;
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}
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#endif
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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 struct __kernel_timespec *ts asm("a1") = _ts;
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register clockid_t clkid asm("a0") = _clkid;
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register long ret asm("v0");
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#if _MIPS_SIM == _MIPS_SIM_ABI64
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register long nr asm("v0") = __NR_clock_gettime;
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#else
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register long nr asm("v0") = __NR_clock_gettime64;
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#endif
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register long error asm("a3");
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asm volatile(
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" syscall\n"
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: "=r" (ret), "=r" (error)
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: "r" (clkid), "r" (ts), "r" (nr)
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
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"$14", "$15", "$24", "$25", "hi", "lo", "memory");
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return error ? -ret : ret;
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}
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#ifdef CONFIG_CSRC_R4K
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static __always_inline u64 read_r4k_count(void)
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{
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unsigned int count;
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__asm__ __volatile__(
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" .set push\n"
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" .set mips32r2\n"
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" rdhwr %0, $2\n"
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" .set pop\n"
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: "=r" (count));
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return count;
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}
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#endif
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#ifdef CONFIG_CLKSRC_MIPS_GIC
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static __always_inline u64 read_gic_count(const struct vdso_data *data)
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{
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void __iomem *gic = get_gic(data);
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u32 hi, hi2, lo;
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do {
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hi = __raw_readl(gic + sizeof(lo));
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lo = __raw_readl(gic);
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hi2 = __raw_readl(gic + sizeof(lo));
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} while (hi2 != hi);
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return (((u64)hi) << 32) + lo;
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}
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#endif
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static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
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{
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#ifdef CONFIG_CLKSRC_MIPS_GIC
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const struct vdso_data *data = get_vdso_data();
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#endif
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u64 cycle_now;
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switch (clock_mode) {
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#ifdef CONFIG_CSRC_R4K
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case VDSO_CLOCK_R4K:
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cycle_now = read_r4k_count();
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break;
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#endif
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#ifdef CONFIG_CLKSRC_MIPS_GIC
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case VDSO_CLOCK_GIC:
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cycle_now = read_gic_count(data);
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break;
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#endif
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default:
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cycle_now = 0;
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break;
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}
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return cycle_now;
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}
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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 get_vdso_data();
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
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@ -68,14 +68,14 @@ static inline unsigned long get_vdso_base(void)
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return addr;
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}
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static inline const union mips_vdso_data *get_vdso_data(void)
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static inline const struct vdso_data *get_vdso_data(void)
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{
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return (const union mips_vdso_data *)(get_vdso_base() - PAGE_SIZE);
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return (const struct vdso_data *)(get_vdso_base() - PAGE_SIZE);
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}
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#ifdef CONFIG_CLKSRC_MIPS_GIC
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static inline void __iomem *get_gic(const union mips_vdso_data *data)
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static inline void __iomem *get_gic(const struct vdso_data *data)
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{
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return (void __iomem *)data - PAGE_SIZE;
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}
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@ -0,0 +1,43 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_VDSO_VSYSCALL_H
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#define __ASM_VDSO_VSYSCALL_H
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#ifndef __ASSEMBLY__
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#include <linux/timekeeper_internal.h>
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#include <vdso/datapage.h>
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extern struct vdso_data *vdso_data;
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/*
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* Update the vDSO data page to keep in sync with kernel timekeeping.
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*/
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static __always_inline
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struct vdso_data *__mips_get_k_vdso_data(void)
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{
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return vdso_data;
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}
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#define __arch_get_k_vdso_data __mips_get_k_vdso_data
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static __always_inline
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int __mips_get_clock_mode(struct timekeeper *tk)
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{
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u32 clock_mode = tk->tkr_mono.clock->archdata.vdso_clock_mode;
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return clock_mode;
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}
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#define __arch_get_clock_mode __mips_get_clock_mode
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static __always_inline
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int __mips_use_vsyscall(struct vdso_data *vdata)
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{
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return (vdata[CS_HRES_COARSE].clock_mode != VDSO_CLOCK_NONE);
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}
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#define __arch_use_vsyscall __mips_use_vsyscall
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/* The asm-generic header needs to be included after the definitions above */
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#include <asm-generic/vdso/vsyscall.h>
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_VDSO_VSYSCALL_H */
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@ -20,9 +20,12 @@
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#include <asm/mips-cps.h>
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#include <asm/page.h>
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#include <asm/vdso.h>
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#include <vdso/helpers.h>
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#include <vdso/vsyscall.h>
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/* Kernel-provided data used by the VDSO. */
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static union mips_vdso_data vdso_data __page_aligned_data;
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static union mips_vdso_data mips_vdso_data __page_aligned_data;
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struct vdso_data *vdso_data = mips_vdso_data.data;
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/*
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* Mapping for the VDSO data/GIC pages. The real pages are mapped manually, as
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@ -66,34 +69,6 @@ static int __init init_vdso(void)
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}
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subsys_initcall(init_vdso);
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void update_vsyscall(struct timekeeper *tk)
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{
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vdso_data_write_begin(&vdso_data);
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vdso_data.xtime_sec = tk->xtime_sec;
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vdso_data.xtime_nsec = tk->tkr_mono.xtime_nsec;
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vdso_data.wall_to_mono_sec = tk->wall_to_monotonic.tv_sec;
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vdso_data.wall_to_mono_nsec = tk->wall_to_monotonic.tv_nsec;
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vdso_data.cs_shift = tk->tkr_mono.shift;
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vdso_data.clock_mode = tk->tkr_mono.clock->archdata.vdso_clock_mode;
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if (vdso_data.clock_mode != VDSO_CLOCK_NONE) {
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vdso_data.cs_mult = tk->tkr_mono.mult;
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vdso_data.cs_cycle_last = tk->tkr_mono.cycle_last;
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vdso_data.cs_mask = tk->tkr_mono.mask;
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}
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vdso_data_write_end(&vdso_data);
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}
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void update_vsyscall_tz(void)
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{
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if (vdso_data.clock_mode != VDSO_CLOCK_NONE) {
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vdso_data.tz_minuteswest = sys_tz.tz_minuteswest;
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vdso_data.tz_dsttime = sys_tz.tz_dsttime;
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}
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}
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static unsigned long vdso_base(void)
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{
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unsigned long base;
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@ -163,7 +138,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
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*/
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if (cpu_has_dc_aliases) {
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base = __ALIGN_MASK(base, shm_align_mask);
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base += ((unsigned long)&vdso_data - gic_size) & shm_align_mask;
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base += ((unsigned long)vdso_data - gic_size) & shm_align_mask;
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}
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data_addr = base + gic_size;
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@ -189,7 +164,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
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/* Map data page. */
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ret = remap_pfn_range(vma, data_addr,
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virt_to_phys(&vdso_data) >> PAGE_SHIFT,
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virt_to_phys(vdso_data) >> PAGE_SHIFT,
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PAGE_SIZE, PAGE_READONLY);
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if (ret)
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goto out;
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@ -1,6 +1,12 @@
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# SPDX-License-Identifier: GPL-2.0
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# Objects to go into the VDSO.
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obj-vdso-y := elf.o gettimeofday.o sigreturn.o
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# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
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# the inclusion of generic Makefile.
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ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
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include $(srctree)/lib/vdso/Makefile
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obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
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# Common compiler flags between ABIs.
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ccflags-vdso := \
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@ -15,15 +21,31 @@ ifdef CONFIG_CC_IS_CLANG
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ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
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endif
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#
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# The -fno-jump-tables flag only prevents the compiler from generating
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# jump tables but does not prevent the compiler from emitting absolute
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# offsets.
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cflags-vdso := $(ccflags-vdso) \
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$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
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-O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
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-DDISABLE_BRANCH_PROFILING \
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-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
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-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
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$(call cc-option, -fno-asynchronous-unwind-tables) \
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$(call cc-option, -fno-stack-protector)
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aflags-vdso := $(ccflags-vdso) \
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-D__ASSEMBLY__ -Wa,-gdwarf-2
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ifneq ($(c-gettimeofday-y),)
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CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
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# config-n32-o32-env.c prepares the environment to build a 32bit vDSO
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# library on a 64bit kernel.
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# Note: Needs to be included before than the generic library.
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CFLAGS_vgettimeofday-o32.o = -include $(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
|
||||
CFLAGS_vgettimeofday-n32.o = -include $(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
|
||||
endif
|
||||
|
||||
CFLAGS_REMOVE_vgettimeofday.o = -pg
|
||||
|
||||
#
|
||||
# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
|
||||
# the base address of VDSO, the linker will emit a R_MIPS_PC32
|
||||
|
|
@ -48,6 +70,8 @@ VDSO_LDFLAGS := \
|
|||
$(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
|
||||
-nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
|
||||
|
||||
CFLAGS_REMOVE_vdso.o = -pg
|
||||
|
||||
GCOV_PROFILE := n
|
||||
UBSAN_SANITIZE := n
|
||||
|
||||
|
|
@ -96,6 +120,7 @@ $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
|
|||
|
||||
$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
|
||||
$(call if_changed,vdsold)
|
||||
$(call if_changed,vdso_check)
|
||||
|
||||
$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
|
||||
$(obj)/genvdso FORCE
|
||||
|
|
@ -134,6 +159,7 @@ $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
|
|||
|
||||
$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
|
||||
$(call if_changed,vdsold)
|
||||
$(call if_changed,vdso_check)
|
||||
|
||||
$(obj)/vdso-o32-image.c: VDSO_NAME := o32
|
||||
$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
|
||||
|
|
@ -174,6 +200,7 @@ $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
|
|||
|
||||
$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
|
||||
$(call if_changed,vdsold)
|
||||
$(call if_changed,vdso_check)
|
||||
|
||||
$(obj)/vdso-n32-image.c: VDSO_NAME := n32
|
||||
$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
|
||||
|
|
|
|||
|
|
@ -0,0 +1,17 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Configuration file for O32 and N32 binaries.
|
||||
* Note: To be included before lib/vdso/gettimeofday.c
|
||||
*/
|
||||
#if defined(CONFIG_MIPS32_O32) || defined(CONFIG_MIPS32_N32)
|
||||
/*
|
||||
* In case of a 32 bit VDSO for a 64 bit kernel fake a 32 bit kernel
|
||||
* configuration.
|
||||
*/
|
||||
#undef CONFIG_64BIT
|
||||
|
||||
#define CONFIG_32BIT 1
|
||||
#define CONFIG_GENERIC_ATOMIC64 1
|
||||
|
||||
#endif
|
||||
|
||||
|
|
@ -4,7 +4,7 @@
|
|||
* Author: Alex Smith <alex.smith@imgtec.com>
|
||||
*/
|
||||
|
||||
#include "vdso.h"
|
||||
#include <asm/vdso/vdso.h>
|
||||
|
||||
#include <asm/isa-rev.h>
|
||||
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@
|
|||
* Author: Alex Smith <alex.smith@imgtec.com>
|
||||
*/
|
||||
|
||||
#include "vdso.h"
|
||||
#include <asm/vdso/vdso.h>
|
||||
|
||||
#include <uapi/asm/unistd.h>
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,40 @@
|
|||
// SPDX-License-Identifier: GPL-2.0-or-later
|
||||
/*
|
||||
* MIPS64 and compat userspace implementations of gettimeofday()
|
||||
* and similar.
|
||||
*
|
||||
* Copyright (C) 2015 Imagination Technologies
|
||||
* Copyright (C) 2018 ARM Limited
|
||||
*
|
||||
*/
|
||||
#include <linux/time.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
#if _MIPS_SIM != _MIPS_SIM_ABI64
|
||||
int __vdso_clock_gettime(clockid_t clock,
|
||||
struct old_timespec32 *ts)
|
||||
{
|
||||
return __cvdso_clock_gettime32(clock, ts);
|
||||
}
|
||||
|
||||
int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
|
||||
struct timezone *tz)
|
||||
{
|
||||
return __cvdso_gettimeofday(tv, tz);
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
int __vdso_clock_gettime(clockid_t clock,
|
||||
struct __kernel_timespec *ts)
|
||||
{
|
||||
return __cvdso_clock_gettime(clock, ts);
|
||||
}
|
||||
|
||||
int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
|
||||
struct timezone *tz)
|
||||
{
|
||||
return __cvdso_gettimeofday(tv, tz);
|
||||
}
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue