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[PATCH v3 02/15] hw/core/clock: trace clock values in Hz instead of ns

From: Luc Michel
Subject: [PATCH v3 02/15] hw/core/clock: trace clock values in Hz instead of ns
Date: Sat, 10 Oct 2020 15:57:46 +0200

The nanosecond unit greatly limits the dynamic range we can display in
clock value traces, for values in the order of 1GHz and more. The
internal representation can go way beyond this value and it is quite
common for today's clocks to be within those ranges.

For example, a frequency between 500MHz+ and 1GHz will be displayed as
1ns. Beyond 1GHz, it will show up as 0ns.

Replace nanosecond periods traces with frequencies in the Hz unit
to have more dynamic range in the trace output.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Damien Hedde <damien.hedde@greensocs.com>
Signed-off-by: Luc Michel <luc@lmichel.fr>
 hw/core/clock.c      | 6 +++---
 hw/core/trace-events | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/hw/core/clock.c b/hw/core/clock.c
index 7066282f7b..81184734e0 100644
--- a/hw/core/clock.c
+++ b/hw/core/clock.c
@@ -37,12 +37,12 @@ void clock_clear_callback(Clock *clk)
 bool clock_set(Clock *clk, uint64_t period)
     if (clk->period == period) {
         return false;
-    trace_clock_set(CLOCK_PATH(clk), CLOCK_PERIOD_TO_NS(clk->period),
-                    CLOCK_PERIOD_TO_NS(period));
+    trace_clock_set(CLOCK_PATH(clk), CLOCK_PERIOD_TO_HZ(clk->period),
+                    CLOCK_PERIOD_TO_HZ(period));
     clk->period = period;
     return true;
@@ -52,11 +52,11 @@ static void clock_propagate_period(Clock *clk, bool 
     QLIST_FOREACH(child, &clk->children, sibling) {
         if (child->period != clk->period) {
             child->period = clk->period;
             trace_clock_update(CLOCK_PATH(child), CLOCK_PATH(clk),
-                               CLOCK_PERIOD_TO_NS(clk->period),
+                               CLOCK_PERIOD_TO_HZ(clk->period),
             if (call_callbacks && child->callback) {
             clock_propagate_period(child, call_callbacks);
diff --git a/hw/core/trace-events b/hw/core/trace-events
index 1ac60ede6b..360ddeb2c8 100644
--- a/hw/core/trace-events
+++ b/hw/core/trace-events
@@ -29,8 +29,8 @@ resettable_phase_exit_end(void *obj, const char *objtype, 
unsigned count) "obj=%
 resettable_transitional_function(void *obj, const char *objtype) "obj=%p(%s)"
 # clock.c
 clock_set_source(const char *clk, const char *src) "'%s', src='%s'"
 clock_disconnect(const char *clk) "'%s'"
-clock_set(const char *clk, uint64_t old, uint64_t new) "'%s', 
+clock_set(const char *clk, uint64_t old, uint64_t new) "'%s', 
 clock_propagate(const char *clk) "'%s'"
-clock_update(const char *clk, const char *src, uint64_t val, int cb) "'%s', 
src='%s', ns=%"PRIu64", cb=%d"
+clock_update(const char *clk, const char *src, uint64_t hz, int cb) "'%s', 
src='%s', val=%"PRIu64"Hz cb=%d"

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