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clock: Define and use new clock_display_freq()
It's common to want to print a human-readable indication of a clock's frequency. Provide a utility function in the clock API to return a string which is a displayable representation of the frequency, and use it in qdev-monitor.c. Before: (qemu) info qtree [...] dev: xilinx,zynq_slcr, id "" clock-in "ps_clk" freq_hz=3.333333e+07 mmio 00000000f8000000/0000000000001000 After: dev: xilinx,zynq_slcr, id "" clock-in "ps_clk" freq_hz=33.3 MHz mmio 00000000f8000000/0000000000001000 Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Luc Michel <luc@lmichel.fr> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20201215150929.30311-5-peter.maydell@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
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@ -267,6 +267,11 @@ Here is an example:
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clock_get(dev->my_clk_input));
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}
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If you are only interested in the frequency for displaying it to
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humans (for instance in debugging), use ``clock_display_freq()``,
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which returns a prettified string-representation, e.g. "33.3 MHz".
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The caller must free the string with g_free() after use.
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Calculating expiry deadlines
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----------------------------
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@ -12,6 +12,7 @@
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*/
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#include "qemu/osdep.h"
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#include "qemu/cutils.h"
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#include "hw/clock.h"
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#include "trace.h"
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@ -111,6 +112,11 @@ static void clock_disconnect(Clock *clk)
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QLIST_REMOVE(clk, sibling);
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}
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char *clock_display_freq(Clock *clk)
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{
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return freq_to_str(clock_get_hz(clk));
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}
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static void clock_initfn(Object *obj)
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{
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Clock *clk = CLOCK(obj);
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@ -264,4 +264,16 @@ static inline bool clock_is_enabled(const Clock *clk)
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return clock_get(clk) != 0;
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}
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/**
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* clock_display_freq: return human-readable representation of clock frequency
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* @clk: clock
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*
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* Return a string which has a human-readable representation of the
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* clock's frequency, e.g. "33.3 MHz". This is intended for debug
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* and display purposes.
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*
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* The caller is responsible for freeing the string with g_free().
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*/
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char *clock_display_freq(Clock *clk);
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#endif /* QEMU_HW_CLOCK_H */
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@ -736,11 +736,11 @@ static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
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}
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}
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QLIST_FOREACH(ncl, &dev->clocks, node) {
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qdev_printf("clock-%s%s \"%s\" freq_hz=%e\n",
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g_autofree char *freq_str = clock_display_freq(ncl->clock);
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qdev_printf("clock-%s%s \"%s\" freq_hz=%s\n",
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ncl->output ? "out" : "in",
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ncl->alias ? " (alias)" : "",
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ncl->name,
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CLOCK_PERIOD_TO_HZ(1.0 * clock_get(ncl->clock)));
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ncl->name, freq_str);
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}
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class = object_get_class(OBJECT(dev));
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do {
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