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[src/trunk]: src/sys/dev/acpi acpi: Add support for Collaborative Processor P...



details:   https://anonhg.NetBSD.org/src/rev/ea7caf805355
branches:  trunk
changeset: 957884:ea7caf805355
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Dec 13 20:39:20 2020 +0000

description:
acpi: Add support for Collaborative Processor Performance Control (CPPC).

CPPC is the modern replacement for processor performance controls (P-states
and T-states). The _CPC method on a processor device contains information
about supported performance levels of the device.

This driver reports the supported performance levels and allows for
setting the desired level using the machdep.cpufreq.cpuN.* sysctls. Note
that a "performance level" value is not guaranteed to represent a CPU
frequency, so treat the numbers reported as such.

diffstat:

 sys/dev/acpi/acpi_cppc.c |  440 +++++++++++++++++++++++++++++++++++++++++++++++
 sys/dev/acpi/files.acpi  |    7 +-
 2 files changed, 446 insertions(+), 1 deletions(-)

diffs (truncated from 465 to 300 lines):

diff -r bf9030626010 -r ea7caf805355 sys/dev/acpi/acpi_cppc.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/acpi/acpi_cppc.c  Sun Dec 13 20:39:20 2020 +0000
@@ -0,0 +1,440 @@
+/* $NetBSD: acpi_cppc.c,v 1.1 2020/12/13 20:39:20 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2020 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * ACPI Collaborative Processor Performance Control support.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: acpi_cppc.c,v 1.1 2020/12/13 20:39:20 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/cpu.h>
+#include <sys/device.h>
+#include <sys/kmem.h>
+#include <sys/sysctl.h>
+
+#include <dev/acpi/acpireg.h>
+#include <dev/acpi/acpivar.h>
+#include <dev/acpi/acpi_pcc.h>
+
+#include <external/bsd/acpica/dist/include/amlresrc.h>
+
+/* _CPC package elements */
+typedef enum CPCPackageElement {
+       CPCNumEntries,
+       CPCRevision,
+       CPCHighestPerformance,
+       CPCNominalPerformance,
+       CPCLowestNonlinearPerformance,
+       CPCLowestPerformance,
+       CPCGuaranteedPerformanceReg,
+       CPCDesiredPerformanceReg,
+       CPCMinimumPerformanceReg,
+       CPCMaximumPerformanceReg,
+       CPCPerformanceReductionToleranceReg,
+       CPCTimeWindowReg,
+       CPCCounterWraparoundTime,
+       CPCReferencePerformanceCounterReg,
+       CPCDeliveredPerformanceCounterReg,
+       CPCPerformanceLimitedReg,
+       CPCCPPCEnableReg,
+       CPCAutonomousSelectionEnable,
+       CPCAutonomousActivityWindowReg,
+       CPCEnergyPerformancePreferenceReg,
+       CPCReferencePerformance,
+       CPCLowestFrequency,
+       CPCNominalFrequency,
+} CPCPackageElement;
+
+/* PCC command numbers */
+#define        CPPC_PCC_READ   0x00
+#define        CPPC_PCC_WRITE  0x01
+
+struct cppc_softc {
+       device_t                sc_dev;
+       struct cpu_info *       sc_cpuinfo;
+       ACPI_HANDLE             sc_handle;
+       ACPI_OBJECT *           sc_cpc;
+       u_int                   sc_ncpc;
+
+       char *                  sc_available;
+       int                     sc_node_target;
+       int                     sc_node_current;
+       ACPI_INTEGER            sc_max_target;
+       ACPI_INTEGER            sc_min_target;
+};
+
+static int             cppc_match(device_t, cfdata_t, void *);
+static void            cppc_attach(device_t, device_t, void *);
+
+static ACPI_STATUS     cppc_parse_cpc(struct cppc_softc *);
+static ACPI_STATUS     cppc_cpufreq_init(struct cppc_softc *);
+static ACPI_STATUS     cppc_read(struct cppc_softc *, CPCPackageElement,
+                                 ACPI_INTEGER *);
+static ACPI_STATUS     cppc_write(struct cppc_softc *, CPCPackageElement,
+                                  ACPI_INTEGER);
+
+CFATTACH_DECL_NEW(acpicppc, sizeof(struct cppc_softc),
+    cppc_match, cppc_attach, NULL, NULL);
+
+static const char * const compatible[] = {
+       "ACPI0007",     /* ACPI Processor Device */
+       NULL
+};
+
+static int
+cppc_match(device_t parent, cfdata_t cf, void *aux)
+{
+       struct acpi_attach_args * const aa = aux;
+       ACPI_HANDLE handle;
+       ACPI_STATUS rv;
+
+       if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) {
+               return 0;
+       }
+
+       if (acpi_match_hid(aa->aa_node->ad_devinfo, compatible) == 0) {
+               return 0;
+       }
+
+       rv = AcpiGetHandle(aa->aa_node->ad_handle, "_CPC", &handle);
+       if (ACPI_FAILURE(rv)) {
+               return 0;
+       }
+
+       if (acpi_match_cpu_handle(aa->aa_node->ad_handle) == NULL) {
+               return 0;
+       }
+
+       /* When CPPC and P-states/T-states are both available, prefer CPPC */
+       return 20;
+}
+
+static void
+cppc_attach(device_t parent, device_t self, void *aux)
+{
+       struct cppc_softc * const sc = device_private(self);
+       struct acpi_attach_args * const aa = aux;
+       ACPI_HANDLE handle = aa->aa_node->ad_handle;
+       struct cpu_info *ci;
+       ACPI_STATUS rv;
+
+       ci = acpi_match_cpu_handle(handle);
+       KASSERT(ci != NULL);
+
+       aprint_naive("\n");
+       aprint_normal(": Processor Performance Control (%s)\n", cpu_name(ci));
+
+       sc->sc_dev = self;
+       sc->sc_cpuinfo = ci;
+       sc->sc_handle = handle;
+
+       rv = cppc_parse_cpc(sc);
+       if (ACPI_FAILURE(rv)) {
+               aprint_error_dev(self, "failed to parse CPC package: %s\n",
+                   AcpiFormatException(rv));
+               return;
+       }
+
+       cppc_cpufreq_init(sc);
+}
+
+/*
+ * cppc_parse_cpc --
+ *
+ *     Read and verify the contents of the _CPC package.
+ */
+static ACPI_STATUS
+cppc_parse_cpc(struct cppc_softc *sc)
+{
+       ACPI_BUFFER buf;
+       ACPI_STATUS rv;
+
+       buf.Pointer = NULL;
+       buf.Length = ACPI_ALLOCATE_BUFFER;
+       rv = AcpiEvaluateObjectTyped(sc->sc_handle, "_CPC", NULL, &buf,
+           ACPI_TYPE_PACKAGE);
+       if (ACPI_FAILURE(rv)) {
+               return rv;
+       }
+
+       sc->sc_cpc = (ACPI_OBJECT *)buf.Pointer;
+       if (sc->sc_cpc->Package.Count == 0) {
+               return AE_NOT_EXIST;
+       }
+       if (sc->sc_cpc->Package.Elements[CPCNumEntries].Type !=
+           ACPI_TYPE_INTEGER) {
+               return AE_TYPE;
+       }
+       sc->sc_ncpc =
+           sc->sc_cpc->Package.Elements[CPCNumEntries].Integer.Value;
+
+       return AE_OK;
+}
+
+/*
+ * cppc_cpufreq_sysctl --
+ *
+ *     sysctl helper function for machdep.cpu.cpuN.{target,current}
+ *     nodes.
+ */
+static int
+cppc_cpufreq_sysctl(SYSCTLFN_ARGS)
+{
+       struct cppc_softc * const sc = rnode->sysctl_data;
+       struct sysctlnode node;
+       u_int fq, oldfq = 0;
+       ACPI_INTEGER val;
+       ACPI_STATUS rv;
+       int error;
+
+       node = *rnode;
+       node.sysctl_data = &fq;
+
+       if (rnode->sysctl_num == sc->sc_node_target) {
+               rv = cppc_read(sc, CPCDesiredPerformanceReg, &val);
+       } else {
+               /*
+                * XXX We should measure the delivered performance and
+                *     report it here. For now, just report the desired
+                *     performance level.
+                */
+               rv = cppc_read(sc, CPCDesiredPerformanceReg, &val);
+       }
+       if (ACPI_FAILURE(rv)) {
+               return EIO;
+       }
+       if (val > UINT32_MAX) {
+               return ERANGE;
+       }
+       fq = (u_int)val;
+
+       if (rnode->sysctl_num == sc->sc_node_target) {
+               oldfq = fq;
+       }
+
+       error = sysctl_lookup(SYSCTLFN_CALL(&node));
+       if (error != 0 || newp == NULL) {
+               return error;
+       }
+
+       if (fq == oldfq || rnode->sysctl_num != sc->sc_node_target) {
+               return 0;
+       }
+
+       if (fq < sc->sc_min_target || fq > sc->sc_max_target) {
+               return EINVAL;
+       }
+
+       rv = cppc_write(sc, CPCDesiredPerformanceReg, fq);
+       if (ACPI_FAILURE(rv)) {
+               return EIO;
+       }
+
+       return 0;
+}
+
+/*
+ * cppc_cpufreq_init --
+ *
+ *     Create sysctl machdep.cpu.cpuN.* sysctl tree.
+ */
+static ACPI_STATUS
+cppc_cpufreq_init(struct cppc_softc *sc)
+{
+       static CPCPackageElement perf_regs[4] = {
+               CPCHighestPerformance,
+               CPCNominalPerformance,
+               CPCLowestNonlinearPerformance,
+               CPCLowestPerformance
+       };
+       ACPI_INTEGER perf[4], last;
+       const struct sysctlnode *node, *cpunode;
+       struct sysctllog *log = NULL;
+       struct cpu_info *ci = sc->sc_cpuinfo;
+       ACPI_STATUS rv;
+       int error, i, n;
+
+       /*
+        * Read highest, nominal, lowest nonlinear, and lowest performance
+        * levels and advertise this list of performance levels in the
+        * machdep.cpufreq.cpuN.available sysctl.
+        */
+       sc->sc_available = kmem_zalloc(
+           strlen("########## ") * __arraycount(perf_regs), KM_SLEEP);
+       last = 0;
+       for (i = 0, n = 0; i < __arraycount(perf_regs); i++) {
+               rv = cppc_read(sc, perf_regs[i], &perf[i]);
+               if (ACPI_FAILURE(rv)) {
+                       return rv;



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