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diff --git a/sys/x86/cpufreq/hwpstate_amd.c b/sys/x86/cpufreq/hwpstate_amd.c
--- a/sys/x86/cpufreq/hwpstate_amd.c
+++ b/sys/x86/cpufreq/hwpstate_amd.c
@@ -123,6 +123,7 @@
static int hwpstate_features(driver_t *driver, u_int *features);
static int hwpstate_get_info_from_acpi_perf(device_t dev, device_t perf_dev);
static int hwpstate_get_info_from_msr(device_t dev);
+static void hwpstate_override_msr(device_t dev);
static int hwpstate_goto_pstate(device_t dev, int pstate_id);
static int hwpstate_verbose;
@@ -144,6 +145,11 @@
&hwpstate_prefer_msr, 0,
"If enabled (1), use MSR instead of acpi_perf for P-state information.");
+static char hwpstate_override_pstatecfgmsr[8 * sizeof("0x8000000049120890")];
+SYSCTL_STRING(_debug, OID_AUTO, hwpstate_override_pstatecfgmsr, CTLFLAG_RWTUN,
+ hwpstate_override_pstatecfgmsr, sizeof(hwpstate_override_pstatecfgmsr),
+ "Allows overriding PStateDef, up to 8 hexadecimals.");
+
static device_method_t hwpstate_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, hwpstate_identify),
@@ -413,6 +419,9 @@
}
}
+ if (strlen(&hwpstate_override_pstatecfgmsr[0]) > 0)
+ hwpstate_override_msr(dev);
+
/*
* If we cannot get info from acpi_perf,
* Let's get info from MSRs.
@@ -433,6 +442,33 @@
return (cpufreq_register(dev));
}
+static void
+hwpstate_override_msr(device_t dev)
+{
+ char temp[sizeof(hwpstate_override_pstatecfgmsr)];
+ char *token, *next;
+ uint64_t msr;
+ int i;
+
+ memcpy(&temp[0], &hwpstate_override_pstatecfgmsr[0], sizeof(temp));
+ next = &temp[0];
+ token = strsep(&next, " ");
+ /* Ignore PStateCurLim here, sysadmin knows best. */
+ for (i = 0; (i < 8) && (token != NULL); ++i) {
+ if (sscanf(token, "0x%lx", &msr) == 1) {
+ HWPSTATE_DEBUG(dev, "Overriding P%d-state with 0x%lx.\n",
+ i, msr);
+ wrmsr(MSR_AMD_10H_11H_CONFIG + i, msr);
+ } else {
+ HWPSTATE_DEBUG(dev,
+ "P%d-state MSR override value not parsable: \"%s\"\n",
+ i, token);
+ break;
+ }
+ token = strsep(&next, " ");
+ }
+}
+
static int
hwpstate_get_info_from_msr(device_t dev)
{
@@ -449,6 +485,7 @@
hwpstate_set = sc->hwpstate_settings;
for (i = 0; i < sc->cfnum; i++) {
msr = rdmsr(MSR_AMD_10H_11H_CONFIG + i);
+ HWPSTATE_DEBUG(dev, "PStateDef[%d]: 0x%lx\n", i, msr);
if ((msr & ((uint64_t)1 << 63)) == 0) {
HWPSTATE_DEBUG(dev, "msr is not valid.\n");
return (ENXIO);

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