Function intel_hwp_dump_sysctl_handler

freebsd/x86/cpufreq/hwpstate_intel.c:120–197

    "Set 1 (default) to enable package-level control, 0 to disable");

static int
intel_hwp_dump_sysctl_handler(SYSCTL_HANDLER_ARGS)
{
	device_t dev;
	struct pcpu *pc;
	struct sbuf *sb;
	struct hwp_softc *sc;
	uint64_t data, data2;
	int ret;

	sc = (struct hwp_softc *)arg1;
	dev = sc->dev;

	pc = cpu_get_pcpu(dev);
	if (pc == NULL)
		return (ENXIO);

	sb = sbuf_new(NULL, NULL, 1024, SBUF_FIXEDLEN | SBUF_INCLUDENUL);
	sbuf_putc(sb, '\n');
	thread_lock(curthread);
	sched_bind(curthread, pc->pc_cpuid);
	thread_unlock(curthread);

	rdmsr_safe(MSR_IA32_PM_ENABLE, &data);
	sbuf_printf(sb, "CPU%d: HWP %sabled\n", pc->pc_cpuid,
	    ((data & 1) ? "En" : "Dis"));

	if (data == 0) {
		ret = 0;
		goto out;
	}

	rdmsr_safe(MSR_IA32_HWP_CAPABILITIES, &data);
	sbuf_printf(sb, "\tHighest Performance: %03ju\n", data & 0xff);
	sbuf_printf(sb, "\tGuaranteed Performance: %03ju\n", (data >> 8) & 0xff);
	sbuf_printf(sb, "\tEfficient Performance: %03ju\n", (data >> 16) & 0xff);
	sbuf_printf(sb, "\tLowest Performance: %03ju\n", (data >> 24) & 0xff);

	rdmsr_safe(MSR_IA32_HWP_REQUEST, &data);
	data2 = 0;
	if (sc->hwp_pkg_ctrl && (data & IA32_HWP_REQUEST_PACKAGE_CONTROL))
		rdmsr_safe(MSR_IA32_HWP_REQUEST_PKG, &data2);

	sbuf_putc(sb, '\n');

#define pkg_print(x, name, offset) do {					\
	if (!sc->hwp_pkg_ctrl || (data & x) != 0) 			\
		sbuf_printf(sb, "\t%s: %03u\n", name,			\
		    (unsigned)(data >> offset) & 0xff);			\
	else								\
		sbuf_printf(sb, "\t%s: %03u\n", name,			\
		    (unsigned)(data2 >> offset) & 0xff);		\
} while (0)

	pkg_print(IA32_HWP_REQUEST_EPP_VALID,
	    "Requested Efficiency Performance Preference", 24);
	pkg_print(IA32_HWP_REQUEST_DESIRED_VALID,
	    "Requested Desired Performance", 16);