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-rw-r--r--arch/x86/kernel/tsc.c28
-rw-r--r--include/linux/clocksource_ids.h2
2 files changed, 23 insertions, 7 deletions
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 7978f31c86f0..fd567a0ac90e 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -54,6 +54,7 @@ static u32 art_to_tsc_numerator;
static u32 art_to_tsc_denominator;
static u64 art_to_tsc_offset;
static struct clocksource *art_related_clocksource;
+static bool have_art;
struct cyc2ns {
struct cyc2ns_data data[2]; /* 0 + 2*16 = 32 */
@@ -1168,6 +1169,7 @@ static struct clocksource clocksource_tsc_early = {
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS |
CLOCK_SOURCE_MUST_VERIFY,
+ .id = CSID_X86_TSC_EARLY,
.vdso_clock_mode = VDSO_CLOCKMODE_TSC,
.enable = tsc_cs_enable,
.resume = tsc_resume,
@@ -1190,6 +1192,7 @@ static struct clocksource clocksource_tsc = {
CLOCK_SOURCE_VALID_FOR_HRES |
CLOCK_SOURCE_MUST_VERIFY |
CLOCK_SOURCE_VERIFY_PERCPU,
+ .id = CSID_X86_TSC,
.vdso_clock_mode = VDSO_CLOCKMODE_TSC,
.enable = tsc_cs_enable,
.resume = tsc_resume,
@@ -1309,8 +1312,11 @@ struct system_counterval_t convert_art_to_tsc(u64 art)
do_div(tmp, art_to_tsc_denominator);
res += tmp + art_to_tsc_offset;
- return (struct system_counterval_t) {.cs = art_related_clocksource,
- .cycles = res};
+ return (struct system_counterval_t) {
+ .cs = art_related_clocksource,
+ .cs_id = have_art ? CSID_X86_TSC : CSID_GENERIC,
+ .cycles = res,
+ };
}
EXPORT_SYMBOL(convert_art_to_tsc);
@@ -1327,9 +1333,10 @@ EXPORT_SYMBOL(convert_art_to_tsc);
* that this flag is set before conversion to TSC is attempted.
*
* Return:
- * struct system_counterval_t - system counter value with the pointer to the
+ * 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
* cs: Clocksource corresponding to system counter value. Used
* by timekeeping code to verify comparability of two cycle
* values.
@@ -1347,8 +1354,11 @@ struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns)
do_div(tmp, USEC_PER_SEC);
res += tmp;
- return (struct system_counterval_t) { .cs = art_related_clocksource,
- .cycles = res};
+ return (struct system_counterval_t) {
+ .cs = art_related_clocksource,
+ .cs_id = have_art ? CSID_X86_TSC : CSID_GENERIC,
+ .cycles = res,
+ };
}
EXPORT_SYMBOL(convert_art_ns_to_tsc);
@@ -1454,8 +1464,10 @@ out:
if (tsc_unstable)
goto unreg;
- if (boot_cpu_has(X86_FEATURE_ART))
+ if (boot_cpu_has(X86_FEATURE_ART)) {
art_related_clocksource = &clocksource_tsc;
+ have_art = true;
+ }
clocksource_register_khz(&clocksource_tsc, tsc_khz);
unreg:
clocksource_unregister(&clocksource_tsc_early);
@@ -1480,8 +1492,10 @@ static int __init init_tsc_clocksource(void)
* the refined calibration and directly register it as a clocksource.
*/
if (boot_cpu_has(X86_FEATURE_TSC_KNOWN_FREQ)) {
- if (boot_cpu_has(X86_FEATURE_ART))
+ if (boot_cpu_has(X86_FEATURE_ART)) {
art_related_clocksource = &clocksource_tsc;
+ have_art = true;
+ }
clocksource_register_khz(&clocksource_tsc, tsc_khz);
clocksource_unregister(&clocksource_tsc_early);
diff --git a/include/linux/clocksource_ids.h b/include/linux/clocksource_ids.h
index 16775d7d8f8d..f8467946e9ee 100644
--- a/include/linux/clocksource_ids.h
+++ b/include/linux/clocksource_ids.h
@@ -6,6 +6,8 @@
enum clocksource_ids {
CSID_GENERIC = 0,
CSID_ARM_ARCH_COUNTER,
+ CSID_X86_TSC_EARLY,
+ CSID_X86_TSC,
CSID_MAX,
};