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[src/trunk]: src/sys/dev/acpi acpicpu: Add support for ACPI P-states and T-st...
details: https://anonhg.NetBSD.org/src/rev/4c56f4ee7d14
branches: trunk
changeset: 946747:4c56f4ee7d14
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Mon Dec 07 10:57:41 2020 +0000
description:
acpicpu: Add support for ACPI P-states and T-states on Arm.
diffstat:
sys/arch/arm/acpi/acpi_cpu_md.c | 365 ++++++++++++++++++++++++++++++++++++++++
sys/arch/arm/acpi/files.acpi | 10 +-
sys/arch/evbarm/conf/GENERIC64 | 4 +-
sys/dev/acpi/acpi.c | 5 +-
sys/dev/acpi/acpi_cpu.c | 19 +-
sys/dev/acpi/acpi_cpu.h | 86 +++++++++-
sys/dev/acpi/acpi_cpu_cstate.c | 13 +-
sys/dev/acpi/acpi_cpu_pstate.c | 27 +-
sys/dev/acpi/acpi_cpu_tstate.c | 50 ++---
sys/dev/acpi/acpi_pcd.c | 81 ++++++++
sys/dev/acpi/files.acpi | 7 +-
11 files changed, 603 insertions(+), 64 deletions(-)
diffs (truncated from 1005 to 300 lines):
diff -r 15a7a68b679b -r 4c56f4ee7d14 sys/arch/arm/acpi/acpi_cpu_md.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/acpi/acpi_cpu_md.c Mon Dec 07 10:57:41 2020 +0000
@@ -0,0 +1,365 @@
+/* $NetBSD: acpi_cpu_md.c,v 1.1 2020/12/07 10:57:41 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.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: acpi_cpu_md.c,v 1.1 2020/12/07 10:57:41 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/cpu.h>
+#include <sys/cpufreq.h>
+#include <sys/device.h>
+#include <sys/sysctl.h>
+
+#include <dev/acpi/acpica.h>
+#include <dev/acpi/acpivar.h>
+#include <dev/acpi/acpi_cpu.h>
+#include <dev/acpi/acpi_util.h>
+
+static struct sysctllog *acpicpu_log = NULL;
+
+/*
+ * acpicpu_md_match --
+ *
+ * Match against an ACPI processor device node (either a device
+ * with HID "ACPI0007" or a processor node) and return a pointer
+ * to the corresponding CPU device's 'cpu_info' struct.
+ *
+ */
+struct cpu_info *
+acpicpu_md_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct acpi_attach_args * const aa = aux;
+
+ return acpi_match_cpu_handle(aa->aa_node->ad_handle);
+}
+
+/*
+ * acpicpu_md_attach --
+ *
+ * Return a pointer to the CPU device's 'cpu_info' struct
+ * corresponding with this device.
+ *
+ */
+struct cpu_info *
+acpicpu_md_attach(device_t parent, device_t self, void *aux)
+{
+ struct acpi_attach_args * const aa = aux;
+
+ return acpi_match_cpu_handle(aa->aa_node->ad_handle);
+}
+
+/*
+ * acpicpu_md_flags --
+ *
+ * Return a bitmask of ACPICPU_FLAG_* platform specific quirks.
+ *
+ */
+uint32_t
+acpicpu_md_flags(void)
+{
+ return 0;
+}
+
+/*
+ * acpicpu_md_cstate_start --
+ *
+ * Not implemented.
+ *
+ */
+int
+acpicpu_md_cstate_start(struct acpicpu_softc *sc)
+{
+ return EINVAL;
+}
+
+/*
+ * acpicpu_md_cstate_stop --
+ *
+ * Not implemented.
+ *
+ */
+int
+acpicpu_md_cstate_stop(void)
+{
+ return EALREADY;
+}
+
+/*
+ * acpicpu_md_cstate_enter --
+ *
+ * Not implemented.
+ *
+ */
+void
+acpicpu_md_cstate_enter(int method, int state)
+{
+}
+
+/*
+ * acpicpu_md_pstate_init --
+ *
+ * MD initialization for P-state support. Nothing to do here.
+ *
+ */
+int
+acpicpu_md_pstate_init(struct acpicpu_softc *sc)
+{
+ return 0;
+}
+
+/*
+ * acpicpu_md_pstate_sysctl_current --
+ *
+ * sysctl(9) callback for retrieving the current CPU frequency.
+ *
+ */
+static int
+acpicpu_md_pstate_sysctl_current(SYSCTLFN_ARGS)
+{
+ struct sysctlnode node;
+ uint32_t freq;
+ int error;
+
+ freq = cpufreq_get(curcpu());
+ if (freq == 0)
+ return ENXIO;
+
+ node = *rnode;
+ node.sysctl_data = &freq;
+
+ error = sysctl_lookup(SYSCTLFN_CALL(&node));
+ if (error || newp == NULL)
+ return error;
+
+ return 0;
+}
+
+/*
+ * acpicpu_md_pstate_sysctl_target --
+ *
+ * sysctl(9) callback for setting the target CPU frequency.
+ *
+ */
+static int
+acpicpu_md_pstate_sysctl_target(SYSCTLFN_ARGS)
+{
+ struct sysctlnode node;
+ uint32_t freq;
+ int error;
+
+ freq = cpufreq_get(curcpu());
+ if (freq == 0)
+ return ENXIO;
+
+ node = *rnode;
+ node.sysctl_data = &freq;
+
+ error = sysctl_lookup(SYSCTLFN_CALL(&node));
+ if (error || newp == NULL)
+ return error;
+
+ cpufreq_set_all(freq);
+
+ return 0;
+}
+
+/*
+ * acpicpu_md_pstate_sysctl_available --
+ *
+ * sysctl(9) callback for returning a list of supported CPU frequencies.
+ *
+ */
+static int
+acpicpu_md_pstate_sysctl_available(SYSCTLFN_ARGS)
+{
+ struct acpicpu_softc * const sc = rnode->sysctl_data;
+ struct sysctlnode node;
+ char buf[1024];
+ size_t len;
+ uint32_t i;
+ int error;
+
+ memset(buf, 0, sizeof(buf));
+
+ mutex_enter(&sc->sc_mtx);
+ for (len = 0, i = sc->sc_pstate_max; i < sc->sc_pstate_count; i++) {
+ if (sc->sc_pstate[i].ps_freq == 0)
+ continue;
+ if (len >= sizeof(buf))
+ break;
+ len += snprintf(buf + len, sizeof(buf) - len, "%u%s",
+ sc->sc_pstate[i].ps_freq,
+ i < (sc->sc_pstate_count - 1) ? " " : "");
+ }
+ mutex_exit(&sc->sc_mtx);
+
+ node = *rnode;
+ node.sysctl_data = buf;
+
+ error = sysctl_lookup(SYSCTLFN_CALL(&node));
+ if (error || newp == NULL)
+ return error;
+
+ return 0;
+}
+
+/*
+ * acpicpu_md_pstate_start --
+ *
+ * MD startup for P-state support. Create sysctls here.
+ *
+ */
+int
+acpicpu_md_pstate_start(struct acpicpu_softc *sc)
+{
+ const struct sysctlnode *mnode, *cnode, *fnode, *node;
+ int error;
+
+ error = sysctl_createv(&acpicpu_log, 0, NULL, &mnode,
+ CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL,
+ NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL);
+ if (error) {
+ goto teardown;
+ }
+
+ error = sysctl_createv(&acpicpu_log, 0, &mnode, &cnode,
+ 0, CTLTYPE_NODE, "cpu", NULL,
+ NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL);
+ if (error) {
+ goto teardown;
+ }
+
+ error = sysctl_createv(&acpicpu_log, 0, &cnode, &fnode,
+ 0, CTLTYPE_NODE, "frequency", NULL,
+ NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL);
+ if (error) {
+ goto teardown;
+ }
+
+ error = sysctl_createv(&acpicpu_log, 0, &fnode, &node,
+ CTLFLAG_READWRITE, CTLTYPE_INT, "target", NULL,
+ acpicpu_md_pstate_sysctl_target, 0, NULL, 0, CTL_CREATE, CTL_EOL);
+ if (error) {
+ goto teardown;
+ }
+
+ error = sysctl_createv(&acpicpu_log, 0, &fnode, &node,
+ CTLFLAG_READONLY, CTLTYPE_INT, "current", NULL,
+ acpicpu_md_pstate_sysctl_current, 0, NULL, 0, CTL_CREATE, CTL_EOL);
+ if (error) {
+ goto teardown;
+ }
+
+ error = sysctl_createv(&acpicpu_log, 0, &fnode, &node,
+ CTLFLAG_READONLY, CTLTYPE_STRING, "available", NULL,
+ acpicpu_md_pstate_sysctl_available, 0, (void *)sc, 0, CTL_CREATE,
+ CTL_EOL);
+ if (error) {
+ goto teardown;
+ }
+
+ return 0;
+
+teardown:
+ if (acpicpu_log != NULL) {
+ sysctl_teardown(&acpicpu_log);
+ acpicpu_log = NULL;
+ }
+
+ return error;
+}
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