clocksource: Add common vdso clock mode storage
All architectures which use the generic VDSO code have their own storage for the VDSO clock mode. That's pointless and just requires duplicate code. Provide generic storage for it. The new Kconfig symbol is intermediate and will be removed once all architectures are converted over. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Link: https://lkml.kernel.org/r/20200207124403.028046322@linutronix.de
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@ -23,10 +23,19 @@
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struct clocksource;
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struct module;
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#ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
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#if defined(CONFIG_ARCH_CLOCKSOURCE_DATA) || \
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defined(CONFIG_GENERIC_VDSO_CLOCK_MODE)
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#include <asm/clocksource.h>
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#endif
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enum vdso_clock_mode {
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VDSO_CLOCKMODE_NONE,
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#ifdef CONFIG_GENERIC_VDSO_CLOCK_MODE
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VDSO_ARCH_CLOCKMODES,
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#endif
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VDSO_CLOCKMODE_MAX,
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};
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/**
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* struct clocksource - hardware abstraction for a free running counter
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* Provides mostly state-free accessors to the underlying hardware.
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@ -97,6 +106,7 @@ struct clocksource {
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const char *name;
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struct list_head list;
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int rating;
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enum vdso_clock_mode vdso_clock_mode;
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unsigned long flags;
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int (*enable)(struct clocksource *cs);
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@ -928,6 +928,15 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
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clocksource_arch_init(cs);
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#ifdef CONFIG_GENERIC_VDSO_CLOCK_MODE
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if (cs->vdso_clock_mode < 0 ||
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cs->vdso_clock_mode >= VDSO_CLOCKMODE_MAX) {
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pr_warn("clocksource %s registered with invalid VDSO mode %d. Disabling VDSO support.\n",
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cs->name, cs->vdso_clock_mode);
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cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;
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}
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#endif
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/* Initialize mult/shift and max_idle_ns */
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__clocksource_update_freq_scale(cs, scale, freq);
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@ -71,13 +71,19 @@ void update_vsyscall(struct timekeeper *tk)
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{
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struct vdso_data *vdata = __arch_get_k_vdso_data();
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struct vdso_timestamp *vdso_ts;
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s32 clock_mode;
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u64 nsec;
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/* copy vsyscall data */
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vdso_write_begin(vdata);
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vdata[CS_HRES_COARSE].clock_mode = __arch_get_clock_mode(tk);
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vdata[CS_RAW].clock_mode = __arch_get_clock_mode(tk);
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#ifdef CONFIG_GENERIC_VDSO_CLOCK_MODE
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clock_mode = tk->tkr_mono.clock->vdso_clock_mode;
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#else
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clock_mode = __arch_get_clock_mode(tk);
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#endif
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vdata[CS_HRES_COARSE].clock_mode = clock_mode;
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vdata[CS_RAW].clock_mode = clock_mode;
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/* CLOCK_REALTIME also required for time() */
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vdso_ts = &vdata[CS_HRES_COARSE].basetime[CLOCK_REALTIME];
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@ -30,4 +30,7 @@ config GENERIC_VDSO_TIME_NS
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Selected by architectures which support time namespaces in the
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VDSO
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config GENERIC_VDSO_CLOCK_MODE
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bool
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endif
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@ -7,6 +7,7 @@
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/hrtimer_defs.h>
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#include <linux/clocksource.h>
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#include <vdso/datapage.h>
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#include <vdso/helpers.h>
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@ -64,10 +65,14 @@ static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
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do {
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seq = vdso_read_begin(vd);
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if (IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
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vd->clock_mode == VDSO_CLOCKMODE_NONE)
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return -1;
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cycles = __arch_get_hw_counter(vd->clock_mode);
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ns = vdso_ts->nsec;
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last = vd->cycle_last;
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if (unlikely((s64)cycles < 0))
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if (!IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
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unlikely((s64)cycles < 0))
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return -1;
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ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);
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@ -132,10 +137,14 @@ static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
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}
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smp_rmb();
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if (IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
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vd->clock_mode == VDSO_CLOCKMODE_NONE)
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return -1;
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cycles = __arch_get_hw_counter(vd->clock_mode);
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ns = vdso_ts->nsec;
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last = vd->cycle_last;
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if (unlikely((s64)cycles < 0))
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if (!IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
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unlikely((s64)cycles < 0))
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return -1;
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ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);
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