From mboxrd@z Thu Jan 1 00:00:00 1970 From: kevin.brodsky@arm.com (Kevin Brodsky) Date: Mon, 9 May 2016 13:37:01 +0100 Subject: [PATCH 2/2] arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO In-Reply-To: <1462797421-33103-1-git-send-email-kevin.brodsky@arm.com> References: <1462797421-33103-1-git-send-email-kevin.brodsky@arm.com> Message-ID: <1462797421-33103-3-git-send-email-kevin.brodsky@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org So far the arm64 clock_gettime() vDSO implementation only supported the following clocks, falling back to the syscall for the others: - CLOCK_REALTIME{,_COARSE} - CLOCK_MONOTONIC{,_COARSE} This patch adds support for the CLOCK_MONOTONIC_RAW clock, taking advantage of the recent refactoring of the vDSO time functions. Like the non-_COARSE clocks, this only works when the "arch_sys_counter" clocksource is in use (allowing us to read the current time from the virtual counter register), otherwise we also have to fall back to the syscall. Most of the data is shared with CLOCK_MONOTONIC, and the algorithm is similar. The reference implementation in kernel/time/timekeeping.c shows that: - CLOCK_MONOTONIC = tk->wall_to_monotonic + tk->xtime_sec + timekeeping_get_ns(&tk->tkr_mono) - CLOCK_MONOTONIC_RAW = tk->raw_time + timekeeping_get_ns(&tk->tkr_raw) - tkr_mono and tkr_raw are identical (in particular, same clocksource), except these members: * mult (only mono's multiplier is NTP-adjusted) * xtime_nsec (always 0 for raw) Therefore, tk->raw_time and tkr_raw->mult are now also stored in the vDSO data page. Cc: Will Deacon Cc: Dave Martin Cc: Ali Saidi Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/vdso_datapage.h | 8 +++-- arch/arm64/kernel/asm-offsets.c | 6 +++- arch/arm64/kernel/vdso.c | 8 ++++- arch/arm64/kernel/vdso/gettimeofday.S | 57 +++++++++++++++++++++++++++------- 4 files changed, 64 insertions(+), 15 deletions(-) diff --git a/arch/arm64/include/asm/vdso_datapage.h b/arch/arm64/include/asm/vdso_datapage.h index de66199673d7..2b9a63771eda 100644 --- a/arch/arm64/include/asm/vdso_datapage.h +++ b/arch/arm64/include/asm/vdso_datapage.h @@ -22,6 +22,8 @@ struct vdso_data { __u64 cs_cycle_last; /* Timebase at clocksource init */ + __u64 raw_time_sec; /* Raw time */ + __u64 raw_time_nsec; __u64 xtime_clock_sec; /* Kernel time */ __u64 xtime_clock_nsec; __u64 xtime_coarse_sec; /* Coarse time */ @@ -29,8 +31,10 @@ struct vdso_data { __u64 wtm_clock_sec; /* Wall to monotonic time */ __u64 wtm_clock_nsec; __u32 tb_seq_count; /* Timebase sequence counter */ - __u32 cs_mult; /* Clocksource multiplier */ - __u32 cs_shift; /* Clocksource shift */ + /* cs_* members must be adjacent and in this order (ldp accesses) */ + __u32 cs_mono_mult; /* NTP-adjusted clocksource multiplier */ + __u32 cs_shift; /* Clocksource shift (mono = raw) */ + __u32 cs_raw_mult; /* Raw clocksource multiplier */ __u32 tz_minuteswest; /* Whacky timezone stuff */ __u32 tz_dsttime; __u32 use_syscall; diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c index 3ae6b310ac9b..5ff88560e5ef 100644 --- a/arch/arm64/kernel/asm-offsets.c +++ b/arch/arm64/kernel/asm-offsets.c @@ -76,6 +76,7 @@ int main(void) BLANK(); DEFINE(CLOCK_REALTIME, CLOCK_REALTIME); DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC); + DEFINE(CLOCK_MONOTONIC_RAW, CLOCK_MONOTONIC_RAW); DEFINE(CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC); DEFINE(CLOCK_REALTIME_COARSE, CLOCK_REALTIME_COARSE); DEFINE(CLOCK_MONOTONIC_COARSE,CLOCK_MONOTONIC_COARSE); @@ -83,6 +84,8 @@ int main(void) DEFINE(NSEC_PER_SEC, NSEC_PER_SEC); BLANK(); DEFINE(VDSO_CS_CYCLE_LAST, offsetof(struct vdso_data, cs_cycle_last)); + DEFINE(VDSO_RAW_TIME_SEC, offsetof(struct vdso_data, raw_time_sec)); + DEFINE(VDSO_RAW_TIME_NSEC, offsetof(struct vdso_data, raw_time_nsec)); DEFINE(VDSO_XTIME_CLK_SEC, offsetof(struct vdso_data, xtime_clock_sec)); DEFINE(VDSO_XTIME_CLK_NSEC, offsetof(struct vdso_data, xtime_clock_nsec)); DEFINE(VDSO_XTIME_CRS_SEC, offsetof(struct vdso_data, xtime_coarse_sec)); @@ -90,7 +93,8 @@ int main(void) DEFINE(VDSO_WTM_CLK_SEC, offsetof(struct vdso_data, wtm_clock_sec)); DEFINE(VDSO_WTM_CLK_NSEC, offsetof(struct vdso_data, wtm_clock_nsec)); DEFINE(VDSO_TB_SEQ_COUNT, offsetof(struct vdso_data, tb_seq_count)); - DEFINE(VDSO_CS_MULT, offsetof(struct vdso_data, cs_mult)); + DEFINE(VDSO_CS_MONO_MULT, offsetof(struct vdso_data, cs_mono_mult)); + DEFINE(VDSO_CS_RAW_MULT, offsetof(struct vdso_data, cs_raw_mult)); DEFINE(VDSO_CS_SHIFT, offsetof(struct vdso_data, cs_shift)); DEFINE(VDSO_TZ_MINWEST, offsetof(struct vdso_data, tz_minuteswest)); DEFINE(VDSO_TZ_DSTTIME, offsetof(struct vdso_data, tz_dsttime)); diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index 97bc68f4c689..54f7b327fd18 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -212,10 +212,16 @@ void update_vsyscall(struct timekeeper *tk) vdso_data->wtm_clock_nsec = tk->wall_to_monotonic.tv_nsec; if (!use_syscall) { + /* tkr_mono.cycle_last == tkr_raw.cycle_last */ vdso_data->cs_cycle_last = tk->tkr_mono.cycle_last; + vdso_data->raw_time_sec = tk->raw_time.tv_sec; + vdso_data->raw_time_nsec = tk->raw_time.tv_nsec; vdso_data->xtime_clock_sec = tk->xtime_sec; vdso_data->xtime_clock_nsec = tk->tkr_mono.xtime_nsec; - vdso_data->cs_mult = tk->tkr_mono.mult; + /* tkr_raw.xtime_nsec == 0 */ + vdso_data->cs_mono_mult = tk->tkr_mono.mult; + vdso_data->cs_raw_mult = tk->tkr_raw.mult; + /* tkr_mono.shift == tkr_raw.shift */ vdso_data->cs_shift = tk->tkr_mono.shift; } diff --git a/arch/arm64/kernel/vdso/gettimeofday.S b/arch/arm64/kernel/vdso/gettimeofday.S index caff9dd6ba78..f49b6755058a 100644 --- a/arch/arm64/kernel/vdso/gettimeofday.S +++ b/arch/arm64/kernel/vdso/gettimeofday.S @@ -87,6 +87,15 @@ x_tmp .req x8 msub \res_nsec, x_tmp, \nsec_to_sec, \res_nsec .endm + /* + * Returns in res_{sec,nsec} the timespec based on the clock_raw delta, + * used for CLOCK_MONOTONIC_RAW. + */ + .macro get_ts_clock_raw res_sec, res_nsec, clock_nsec, nsec_to_sec + udiv \res_sec, \clock_nsec, \nsec_to_sec + msub \res_nsec, \res_sec, \nsec_to_sec, \clock_nsec + .endm + /* sec and nsec are modified in place. */ .macro add_ts sec, nsec, ts_sec, ts_nsec, nsec_to_sec /* Add timespec. */ @@ -126,7 +135,8 @@ ENTRY(__kernel_gettimeofday) 1: seqcnt_acquire syscall_check fail=4f ldr x10, [vdso_data, #VDSO_CS_CYCLE_LAST] - ldp w11, w12, [vdso_data, #VDSO_CS_MULT] + /* w11 = cs_mono_mult, w12 = cs_shift */ + ldp w11, w12, [vdso_data, #VDSO_CS_MONO_MULT] ldp x13, x14, [vdso_data, #VDSO_XTIME_CLK_SEC] seqcnt_check fail=1b @@ -163,19 +173,19 @@ ENDPROC(__kernel_gettimeofday) /* int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp); */ ENTRY(__kernel_clock_gettime) .cfi_startproc - cmp w0, #JUMPSLOT_MAX - b.hi syscall + cmp w0, #JUMPSLOT_MAX + b.hi syscall adr vdso_data, _vdso_data - adr x_tmp, jumptable - add x_tmp, x_tmp, w0, uxtw #2 - br x_tmp + adr x_tmp, jumptable + add x_tmp, x_tmp, w0, uxtw #2 + br x_tmp jumptable: jump_slot jumptable, CLOCK_REALTIME, realtime jump_slot jumptable, CLOCK_MONOTONIC, monotonic - b syscall - b syscall - b syscall + b syscall + b syscall + jump_slot jumptable, CLOCK_MONOTONIC_RAW, monotonic_raw jump_slot jumptable, CLOCK_REALTIME_COARSE, realtime_coarse jump_slot jumptable, CLOCK_MONOTONIC_COARSE, monotonic_coarse @@ -187,7 +197,8 @@ realtime: seqcnt_acquire syscall_check fail=syscall ldr x10, [vdso_data, #VDSO_CS_CYCLE_LAST] - ldp w11, w12, [vdso_data, #VDSO_CS_MULT] + /* w11 = cs_mono_mult, w12 = cs_shift */ + ldp w11, w12, [vdso_data, #VDSO_CS_MONO_MULT] ldp x13, x14, [vdso_data, #VDSO_XTIME_CLK_SEC] seqcnt_check fail=realtime @@ -205,7 +216,8 @@ monotonic: seqcnt_acquire syscall_check fail=syscall ldr x10, [vdso_data, #VDSO_CS_CYCLE_LAST] - ldp w11, w12, [vdso_data, #VDSO_CS_MULT] + /* w11 = cs_mono_mult, w12 = cs_shift */ + ldp w11, w12, [vdso_data, #VDSO_CS_MONO_MULT] ldp x13, x14, [vdso_data, #VDSO_XTIME_CLK_SEC] ldp x3, x4, [vdso_data, #VDSO_WTM_CLK_SEC] seqcnt_check fail=monotonic @@ -223,6 +235,28 @@ monotonic: b shift_store +monotonic_raw: + seqcnt_acquire + syscall_check fail=syscall + ldr x10, [vdso_data, #VDSO_CS_CYCLE_LAST] + /* w11 = cs_raw_mult, w12 = cs_shift */ + ldp w12, w11, [vdso_data, #VDSO_CS_SHIFT] + ldp x13, x14, [vdso_data, #VDSO_RAW_TIME_SEC] + seqcnt_check fail=monotonic_raw + + /* All computations are done with left-shifted nsecs. */ + lsl x14, x14, x12 + get_nsec_per_sec res=x9 + lsl x9, x9, x12 + + get_clock_shifted_nsec res=x15, cycle_last=x10, mult=x11 + get_ts_clock_raw res_sec=x10, res_nsec=x11, \ + clock_nsec=x15, nsec_to_sec=x9 + + add_ts sec=x10, nsec=x11, ts_sec=x13, ts_nsec=x14, nsec_to_sec=x9 + + b shift_store + realtime_coarse: seqcnt_acquire ldp x10, x11, [vdso_data, #VDSO_XTIME_CRS_SEC] @@ -261,6 +295,7 @@ ENTRY(__kernel_clock_getres) .cfi_startproc cmp w0, #CLOCK_REALTIME ccmp w0, #CLOCK_MONOTONIC, #0x4, ne + ccmp w0, #CLOCK_MONOTONIC_RAW, #0x4, ne b.ne 1f ldr x2, 5f -- 2.8.0