D51487.diff
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	diff --git a/sys/dev/amdsmu/amdsmu.h b/sys/dev/amdsmu/amdsmu.h
	--- a/sys/dev/amdsmu/amdsmu.h
	+++ b/sys/dev/amdsmu/amdsmu.h
	@@ -77,6 +77,7 @@

	bus_space_handle_t metrics_space;
	struct amdsmu_metrics metrics;
	+ uint32_t idlemask;
	};

	static inline uint32_t
	diff --git a/sys/dev/amdsmu/amdsmu.c b/sys/dev/amdsmu/amdsmu.c
	--- a/sys/dev/amdsmu/amdsmu.c
	+++ b/sys/dev/amdsmu/amdsmu.c
	@@ -281,6 +281,14 @@
	return (0);
	}

	+static void
	+amdsmu_fetch_idlemask(device_t dev)
	+{
	+ struct amdsmu_softc *sc = device_get_softc(dev);
	+
	+ sc->idlemask = amdsmu_read4(sc, SMU_REG_IDLEMASK);
	+}
	+
	static int
	amdsmu_attach(device_t dev)
	{
	@@ -407,6 +415,13 @@
	if (err != 0)
	goto err_dump;

	+ /* Get idlemask & add sysctl. */
	+ amdsmu_fetch_idlemask(dev);
	+ SYSCTL_ADD_U32(sc->sysctlctx, SYSCTL_CHILDREN(sc->sysctlnode), OID_AUTO,
	+ "idlemask", CTLFLAG_RD, &sc->idlemask, 0, "SMU idlemask. This "
	+ "value is not documented - only used to help AMD internally debug "
	+ "issues");
	+
	return (0);
	err_dump:
	bus_space_unmap(sc->bus_tag, sc->reg_space, SMU_MEM_SIZE);
	diff --git a/sys/dev/amdsmu/amdsmu_reg.h b/sys/dev/amdsmu/amdsmu_reg.h
	--- a/sys/dev/amdsmu/amdsmu_reg.h
	+++ b/sys/dev/amdsmu/amdsmu_reg.h
	@@ -32,6 +32,7 @@
	#define SMU_REG_MESSAGE 0x538
	#define SMU_REG_RESPONSE 0x980
	#define SMU_REG_ARGUMENT 0x9BC
	+#define SMU_REG_IDLEMASK 0xD14

	enum amdsmu_res {
	SMU_RES_WAIT = 0x00,