5 files changed, 43 insertions, 5 deletions

diff --git a/arch/x86/events/msr.c b/arch/x86/events/msr.c
index 18e2628e2d8f..e7edf19e64c2 100644
--- a/arch/x86/events/msr.c
+++ b/arch/x86/events/msr.c
@@ -188,10 +188,11 @@ static inline u64 msr_read_counter(struct perf_event *event)
         if (event->hw.event_base)
                 rdmsrl(event->hw.event_base, now);
         else
-                rdtscll(now);
+                now = rdtsc_ordered();
 
         return now;
 }
+
 static void msr_event_update(struct perf_event *event)
 {
         u64 prev, now;
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 77254c9c8f61..04addd6e0a4a 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -232,9 +232,6 @@ static __always_inline unsigned long long rdtsc_ordered(void)
         return rdtsc();
 }
 
-/* Deprecated, keep it for a cycle for easier merging: */
-#define rdtscll(now)    do { (now) = rdtsc_ordered(); } while (0)
-
 static inline unsigned long long native_read_pmc(int counter)
 {
         DECLARE_ARGS(val, low, high);
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index cf5d53c3f9ea..2701d221583a 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -31,6 +31,7 @@ static inline cycles_t get_cycles(void)
 }
 
 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_delay_calibrate(void);
 extern void tsc_init(void);
diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c
index 231ad23b24a9..475cb4f5f14f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-inject.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c
@@ -491,7 +491,7 @@ static void do_inject(void)
         unsigned int cpu = i_mce.extcpu;
         u8 b = i_mce.bank;
 
-        rdtscll(i_mce.tsc);
+        i_mce.tsc = rdtsc_ordered();
 
         if (i_mce.misc)
                 i_mce.status |= MCI_STATUS_MISCV;
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index fb4302738410..ef32297ff17e 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -1179,6 +1179,45 @@ struct system_counterval_t convert_art_to_tsc(u64 art)
 }
 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 pointer to the
+ *      corresponding clocksource
+ *      @cycles:        System counter value
+ *      @cs:            Clocksource corresponding to system counter value. Used
+ *                      by timekeeping code to verify comparibility of two cycle
+ *                      values.
+ */
+
+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 = art_related_clocksource,
+                                              .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);
 /**