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x86/tsc: Remove obsolete ART to TSC conversion functions

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convert_art_to_tsc() and convert_art_ns_to_tsc() interfaces are no
longer required. The conversion is now handled by the core code.

Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240513103813.5666-9-lakshmi.sowjanya.d@intel.com
This commit is contained in:
Lakshmi Sowjanya D 2024-05-13 16:08:09 +05:30 committed by Thomas Gleixner
parent d4bea547eb
commit 0f532a789f
2 changed files with 0 additions and 63 deletions
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3
arch/x86/include/asm/tsc.h
View File

@ -28,9 +28,6 @@ static inline cycles_t get_cycles(void)
}
#define get_cycles get_cycles
extern struct system_counterval_t convert_art_to_tsc(u64 art);
extern struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns);
extern void tsc_early_init(void);
extern void tsc_init(void);
extern void mark_tsc_unstable(char *reason);

60
arch/x86/kernel/tsc.c
View File

@ -1297,66 +1297,6 @@ int unsynchronized_tsc(void)
return 0;
}
/*
* Convert ART to TSC given numerator/denominator found in detect_art()
*/
struct system_counterval_t convert_art_to_tsc(u64 art)
{
u64 tmp, res, rem;
rem = do_div(art, art_base_clk.denominator);
res = art * art_base_clk.numerator;
tmp = rem * art_base_clk.numerator;
do_div(tmp, art_base_clk.denominator);
res += tmp + art_base_clk.offset;
return (struct system_counterval_t) {
.cs_id = have_art ? CSID_X86_TSC : CSID_GENERIC,
.cycles = res,
};
}
EXPORT_SYMBOL(convert_art_to_tsc);
/**
* convert_art_ns_to_tsc() - Convert ART in nanoseconds to TSC.
* @art_ns: ART (Always Running Timer) in unit of nanoseconds
*
* PTM requires all timestamps to be in units of nanoseconds. When user
* software requests a cross-timestamp, this function converts system timestamp
* to TSC.
*
* This is valid when CPU feature flag X86_FEATURE_TSC_KNOWN_FREQ is set
* indicating the tsc_khz is derived from CPUID[15H]. Drivers should check
* that this flag is set before conversion to TSC is attempted.
*
* Return:
* struct system_counterval_t - system counter value with the ID of the
* corresponding clocksource:
* cycles: System counter value
* cs_id: The clocksource ID for validating comparability
*/
struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns)
{
u64 tmp, res, rem;
rem = do_div(art_ns, USEC_PER_SEC);
res = art_ns * tsc_khz;
tmp = rem * tsc_khz;
do_div(tmp, USEC_PER_SEC);
res += tmp;
return (struct system_counterval_t) {
.cs_id = have_art ? CSID_X86_TSC : CSID_GENERIC,
.cycles = res,
};
}
EXPORT_SYMBOL(convert_art_ns_to_tsc);
static void tsc_refine_calibration_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(tsc_irqwork, tsc_refine_calibration_work);
/**