Merge git.joyent.com:illumos-joyent20120517

1 files changed, 208 insertions, 0 deletions

diff --git a/usr/src/uts/i86pc/os/cpupm/turbo.c b/usr/src/uts/i86pc/os/cpupm/turbo.c
new file mode 100644
index 0000000000..7844ce2247
--- /dev/null
+++ b/usr/src/uts/i86pc/os/cpupm/turbo.c
@@ -0,0 +1,208 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+/*
+ * Copyright (c) 2009,  Intel Corporation.
+ * All Rights Reserved.
+ */
+
+#include <sys/x86_archext.h>
+#include <sys/machsystm.h>
+#include <sys/archsystm.h>
+#include <sys/x_call.h>
+#include <sys/acpi/acpi.h>
+#include <sys/acpica.h>
+#include <sys/speedstep.h>
+#include <sys/cpu_acpi.h>
+#include <sys/cpupm.h>
+#include <sys/dtrace.h>
+#include <sys/sdt.h>
+
+typedef struct turbo_kstat_s {
+	struct kstat_named	turbo_supported;	/* turbo flag */
+	struct kstat_named	t_mcnt;			/* IA32_MPERF_MSR */
+	struct kstat_named	t_acnt;			/* IA32_APERF_MSR */
+} turbo_kstat_t;
+
+static int turbo_kstat_update(kstat_t *, int);
+static void get_turbo_info(cpupm_mach_turbo_info_t *);
+static void reset_turbo_info(void);
+static void record_turbo_info(cpupm_mach_turbo_info_t *, uint32_t, uint32_t);
+static void update_turbo_info(cpupm_mach_turbo_info_t *);
+
+static kmutex_t turbo_mutex;
+
+turbo_kstat_t turbo_kstat = {
+	{ "turbo_supported",	KSTAT_DATA_UINT32 },
+	{ "turbo_mcnt",		KSTAT_DATA_UINT64 },
+	{ "turbo_acnt",		KSTAT_DATA_UINT64 },
+};
+
+#define	CPU_ACPI_P0			0
+#define	CPU_IN_TURBO			1
+
+/*
+ * MSR for hardware coordination feedback mechanism
+ *   - IA32_MPERF: increments in proportion to a fixed frequency
+ *   - IA32_APERF: increments in proportion to actual performance
+ */
+#define	IA32_MPERF_MSR			0xE7
+#define	IA32_APERF_MSR			0xE8
+
+/*
+ * kstat update function of the turbo mode info
+ */
+static int
+turbo_kstat_update(kstat_t *ksp, int flag)
+{
+	cpupm_mach_turbo_info_t *turbo_info = ksp->ks_private;
+
+	if (flag == KSTAT_WRITE) {
+		return (EACCES);
+	}
+
+	/*
+	 * update the count in case CPU is in the turbo
+	 * mode for a long time
+	 */
+	if (turbo_info->in_turbo == CPU_IN_TURBO)
+		update_turbo_info(turbo_info);
+
+	turbo_kstat.turbo_supported.value.ui32 =
+	    turbo_info->turbo_supported;
+	turbo_kstat.t_mcnt.value.ui64 = turbo_info->t_mcnt;
+	turbo_kstat.t_acnt.value.ui64 = turbo_info->t_acnt;
+
+	return (0);
+}
+
+/*
+ * update the sum of counts and clear MSRs
+ */
+static void
+update_turbo_info(cpupm_mach_turbo_info_t *turbo_info)
+{
+	ulong_t		iflag;
+	uint64_t	mcnt, acnt;
+
+	iflag = intr_clear();
+	mcnt = rdmsr(IA32_MPERF_MSR);
+	acnt = rdmsr(IA32_APERF_MSR);
+	wrmsr(IA32_MPERF_MSR, 0);
+	wrmsr(IA32_APERF_MSR, 0);
+	turbo_info->t_mcnt += mcnt;
+	turbo_info->t_acnt += acnt;
+	intr_restore(iflag);
+}
+
+/*
+ * Get count of MPERF/APERF MSR
+ */
+static void
+get_turbo_info(cpupm_mach_turbo_info_t *turbo_info)
+{
+	ulong_t		iflag;
+	uint64_t	mcnt, acnt;
+
+	iflag = intr_clear();
+	mcnt = rdmsr(IA32_MPERF_MSR);
+	acnt = rdmsr(IA32_APERF_MSR);
+	turbo_info->t_mcnt += mcnt;
+	turbo_info->t_acnt += acnt;
+	intr_restore(iflag);
+}
+
+/*
+ * Clear MPERF/APERF MSR
+ */
+static void
+reset_turbo_info(void)
+{
+	ulong_t		iflag;
+
+	iflag = intr_clear();
+	wrmsr(IA32_MPERF_MSR, 0);
+	wrmsr(IA32_APERF_MSR, 0);
+	intr_restore(iflag);
+}
+
+/*
+ * sum up the count of one CPU_ACPI_P0 transition
+ */
+void
+cpupm_record_turbo_info(cpupm_mach_turbo_info_t *turbo_info,
+    uint32_t cur_state, uint32_t req_state)
+{
+	if (!turbo_info->turbo_supported)
+		return;
+	/*
+	 * enter P0 state
+	 */
+	if (req_state == CPU_ACPI_P0) {
+		reset_turbo_info();
+		turbo_info->in_turbo = CPU_IN_TURBO;
+	}
+	/*
+	 * Leave P0 state
+	 */
+	else if (cur_state == CPU_ACPI_P0) {
+		turbo_info->in_turbo = 0;
+		get_turbo_info(turbo_info);
+	}
+}
+
+cpupm_mach_turbo_info_t *
+cpupm_turbo_init(cpu_t *cp)
+{
+	cpupm_mach_turbo_info_t *turbo_info;
+
+	turbo_info = kmem_zalloc(sizeof (cpupm_mach_turbo_info_t), KM_SLEEP);
+
+	turbo_info->turbo_supported = 1;
+	turbo_info->turbo_ksp = kstat_create("turbo", cp->cpu_id,
+	    "turbo", "misc", KSTAT_TYPE_NAMED,
+	    sizeof (turbo_kstat) / sizeof (kstat_named_t),
+	    KSTAT_FLAG_VIRTUAL);
+
+	if (turbo_info->turbo_ksp == NULL) {
+		cmn_err(CE_NOTE, "kstat_create(turbo) fail");
+	} else {
+		turbo_info->turbo_ksp->ks_data = &turbo_kstat;
+		turbo_info->turbo_ksp->ks_lock = &turbo_mutex;
+		turbo_info->turbo_ksp->ks_update = turbo_kstat_update;
+		turbo_info->turbo_ksp->ks_data_size += MAXNAMELEN;
+		turbo_info->turbo_ksp->ks_private = turbo_info;
+
+		kstat_install(turbo_info->turbo_ksp);
+	}
+
+	return (turbo_info);
+}
+
+void
+cpupm_turbo_fini(cpupm_mach_turbo_info_t *turbo_info)
+{
+	if (turbo_info->turbo_ksp != NULL)
+		kstat_delete(turbo_info->turbo_ksp);
+	kmem_free(turbo_info, sizeof (cpupm_mach_turbo_info_t));
+}