hw/core/clock: trace clock values in Hz instead of ns

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>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/core/clock.c b/hw/core/clock.c
index f866717a835958cd3231d719619725059c22078c..8c6af223e7c05d6e18d48822021ad8aba88db7b3 100644 (file)
--- a/hw/core/clock.c
+++ b/hw/core/clock.c
@@ -54,8 +54,8 @@ 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;
@@ -69,7 +69,7 @@ static void clock_propagate_period(Clock *clk, bool call_callbacks)
         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),
                                call_callbacks);
             if (call_callbacks && child->callback) {
                 child->callback(child->callback_opaque);

diff --git a/hw/core/trace-events b/hw/core/trace-events
index 1ac60ede6b7e9873f029bcbb9f9216b23a0ec41b..360ddeb2c875e616e46b6fe05ab0ba5dd34cd9fe 100644 (file)
--- a/hw/core/trace-events
+++ b/hw/core/trace-events
@@ -31,6 +31,6 @@ 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', ns=%"PRIu64"->%"PRIu64
+clock_set(const char *clk, uint64_t old, uint64_t new) "'%s', %"PRIu64"Hz->%"PRIu64"Hz"
 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"