Function intel_hwpstate_resume

freebsd/x86/cpufreq/hwpstate_intel.c:578–639

* Redo a subset of set_autonomous_hwp on resume; untested. Without this, * testers observed that on resume MSR_IA32_HWP_REQUEST was bogus. */

 * testers observed that on resume MSR_IA32_HWP_REQUEST was bogus.
 */
static int
intel_hwpstate_resume(device_t dev)
{
	struct hwp_softc *sc;
	struct pcpu *pc;
	int ret;

	sc = device_get_softc(dev);

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

	thread_lock(curthread);
	sched_bind(curthread, pc->pc_cpuid);
	thread_unlock(curthread);

	ret = wrmsr_safe(MSR_IA32_PM_ENABLE, 1);
	if (ret) {
		device_printf(dev,
		    "Failed to enable HWP for cpu%d after suspend (%d)\n",
		    pc->pc_cpuid, ret);
		goto out;
	}

	if (sc->hwp_pkg_ctrl_en)
		ret = wrmsr_safe(MSR_IA32_HWP_REQUEST, sc->req |
		    IA32_HWP_REQUEST_PACKAGE_CONTROL);
	else
		ret = wrmsr_safe(MSR_IA32_HWP_REQUEST, sc->req);
	if (ret) {
		device_printf(dev,
		    "Failed to set%s autonomous HWP for cpu%d after suspend\n",
		    sc->hwp_pkg_ctrl_en ? " PKG" : "", pc->pc_cpuid);
		goto out;
	}
	if (sc->hwp_pkg_ctrl_en) {
		ret = wrmsr_safe(MSR_IA32_HWP_REQUEST_PKG, sc->req);
		if (ret) {
			device_printf(dev,
			    "Failed to set autonomous HWP for package after "
			    "suspend\n");
			goto out;
		}
	}
	if (!sc->hwp_pref_ctrl && sc->hwp_perf_bias_cached) {
		ret = wrmsr_safe(MSR_IA32_ENERGY_PERF_BIAS,
		    sc->hwp_energy_perf_bias);
		if (ret) {
			device_printf(dev,
			    "Failed to set energy perf bias for cpu%d after "
			    "suspend\n", pc->pc_cpuid);
		}
	}

out:
	thread_lock(curthread);
	sched_unbind(curthread);