882ae336b5
conditional compilation work-arounds.
1250 lines
38 KiB
C
1250 lines
38 KiB
C
/*-
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* Copyright (c) 2003-2005 Nate Lawson (SDG)
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* Copyright (c) 2001 Michael Smith
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_acpi.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/pcpu.h>
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#include <sys/power.h>
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#include <sys/proc.h>
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#include <sys/sbuf.h>
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#include <sys/smp.h>
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#include <dev/pci/pcivar.h>
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#include <machine/atomic.h>
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#include <machine/bus.h>
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#if defined(__amd64__) || defined(__i386__)
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#include <machine/clock.h>
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#endif
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#include <sys/rman.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.h>
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#include <dev/acpica/acpivar.h>
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/*
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* Support for ACPI Processor devices, including C[1-3] sleep states.
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*/
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/* Hooks for the ACPI CA debugging infrastructure */
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#define _COMPONENT ACPI_PROCESSOR
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ACPI_MODULE_NAME("PROCESSOR")
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struct acpi_cx {
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struct resource *p_lvlx; /* Register to read to enter state. */
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uint32_t type; /* C1-3 (C4 and up treated as C3). */
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uint32_t trans_lat; /* Transition latency (usec). */
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uint32_t power; /* Power consumed (mW). */
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int res_type; /* Resource type for p_lvlx. */
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};
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#define MAX_CX_STATES 8
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struct acpi_cpu_softc {
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device_t cpu_dev;
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ACPI_HANDLE cpu_handle;
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struct pcpu *cpu_pcpu;
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uint32_t cpu_acpi_id; /* ACPI processor id */
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uint32_t cpu_p_blk; /* ACPI P_BLK location */
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uint32_t cpu_p_blk_len; /* P_BLK length (must be 6). */
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struct acpi_cx cpu_cx_states[MAX_CX_STATES];
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int cpu_cx_count; /* Number of valid Cx states. */
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int cpu_prev_sleep;/* Last idle sleep duration. */
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int cpu_features; /* Child driver supported features. */
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/* Runtime state. */
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int cpu_non_c3; /* Index of lowest non-C3 state. */
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u_int cpu_cx_stats[MAX_CX_STATES];/* Cx usage history. */
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/* Values for sysctl. */
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struct sysctl_ctx_list cpu_sysctl_ctx;
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struct sysctl_oid *cpu_sysctl_tree;
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int cpu_cx_lowest;
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char cpu_cx_supported[64];
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int cpu_rid;
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};
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struct acpi_cpu_device {
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struct resource_list ad_rl;
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};
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#define CPU_GET_REG(reg, width) \
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(bus_space_read_ ## width(rman_get_bustag((reg)), \
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rman_get_bushandle((reg)), 0))
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#define CPU_SET_REG(reg, width, val) \
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(bus_space_write_ ## width(rman_get_bustag((reg)), \
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rman_get_bushandle((reg)), 0, (val)))
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#define PM_USEC(x) ((x) >> 2) /* ~4 clocks per usec (3.57955 Mhz) */
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#define ACPI_NOTIFY_CX_STATES 0x81 /* _CST changed. */
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#define CPU_QUIRK_NO_C3 (1<<0) /* C3-type states are not usable. */
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#define CPU_QUIRK_NO_BM_CTRL (1<<2) /* No bus mastering control. */
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#define PCI_VENDOR_INTEL 0x8086
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#define PCI_DEVICE_82371AB_3 0x7113 /* PIIX4 chipset for quirks. */
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#define PCI_REVISION_A_STEP 0
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#define PCI_REVISION_B_STEP 1
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#define PCI_REVISION_4E 2
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#define PCI_REVISION_4M 3
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#define PIIX4_DEVACTB_REG 0x58
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#define PIIX4_BRLD_EN_IRQ0 (1<<0)
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#define PIIX4_BRLD_EN_IRQ (1<<1)
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#define PIIX4_BRLD_EN_IRQ8 (1<<5)
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#define PIIX4_STOP_BREAK_MASK (PIIX4_BRLD_EN_IRQ0 | PIIX4_BRLD_EN_IRQ | PIIX4_BRLD_EN_IRQ8)
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#define PIIX4_PCNTRL_BST_EN (1<<10)
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/* Platform hardware resource information. */
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static uint32_t cpu_smi_cmd; /* Value to write to SMI_CMD. */
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static uint8_t cpu_cst_cnt; /* Indicate we are _CST aware. */
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static int cpu_quirks; /* Indicate any hardware bugs. */
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/* Runtime state. */
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static int cpu_disable_idle; /* Disable entry to idle function */
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static int cpu_cx_count; /* Number of valid Cx states */
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/* Values for sysctl. */
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static struct sysctl_ctx_list cpu_sysctl_ctx;
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static struct sysctl_oid *cpu_sysctl_tree;
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static int cpu_cx_generic;
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static int cpu_cx_lowest;
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static device_t *cpu_devices;
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static int cpu_ndevices;
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static struct acpi_cpu_softc **cpu_softc;
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ACPI_SERIAL_DECL(cpu, "ACPI CPU");
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static int acpi_cpu_probe(device_t dev);
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static int acpi_cpu_attach(device_t dev);
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static int acpi_cpu_suspend(device_t dev);
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static int acpi_cpu_resume(device_t dev);
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static int acpi_pcpu_get_id(uint32_t idx, uint32_t *acpi_id,
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uint32_t *cpu_id);
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static struct resource_list *acpi_cpu_get_rlist(device_t dev, device_t child);
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static device_t acpi_cpu_add_child(device_t dev, u_int order, const char *name,
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int unit);
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static int acpi_cpu_read_ivar(device_t dev, device_t child, int index,
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uintptr_t *result);
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static int acpi_cpu_shutdown(device_t dev);
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static void acpi_cpu_cx_probe(struct acpi_cpu_softc *sc);
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static void acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc);
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static int acpi_cpu_cx_cst(struct acpi_cpu_softc *sc);
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static void acpi_cpu_startup(void *arg);
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static void acpi_cpu_startup_cx(struct acpi_cpu_softc *sc);
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static void acpi_cpu_cx_list(struct acpi_cpu_softc *sc);
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static void acpi_cpu_idle(void);
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static void acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context);
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static int acpi_cpu_quirks(void);
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static int acpi_cpu_usage_sysctl(SYSCTL_HANDLER_ARGS);
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static int acpi_cpu_set_cx_lowest(struct acpi_cpu_softc *sc, int val);
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static int acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS);
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static int acpi_cpu_global_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS);
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static device_method_t acpi_cpu_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, acpi_cpu_probe),
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DEVMETHOD(device_attach, acpi_cpu_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, acpi_cpu_shutdown),
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DEVMETHOD(device_suspend, acpi_cpu_suspend),
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DEVMETHOD(device_resume, acpi_cpu_resume),
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/* Bus interface */
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DEVMETHOD(bus_add_child, acpi_cpu_add_child),
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DEVMETHOD(bus_read_ivar, acpi_cpu_read_ivar),
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DEVMETHOD(bus_get_resource_list, acpi_cpu_get_rlist),
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DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
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DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
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DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
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DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
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DEVMETHOD(bus_driver_added, bus_generic_driver_added),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
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DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
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{0, 0}
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};
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static driver_t acpi_cpu_driver = {
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"cpu",
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acpi_cpu_methods,
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sizeof(struct acpi_cpu_softc),
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};
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static devclass_t acpi_cpu_devclass;
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DRIVER_MODULE(cpu, acpi, acpi_cpu_driver, acpi_cpu_devclass, 0, 0);
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MODULE_DEPEND(cpu, acpi, 1, 1, 1);
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static int
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acpi_cpu_probe(device_t dev)
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{
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int acpi_id, cpu_id;
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ACPI_BUFFER buf;
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ACPI_HANDLE handle;
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ACPI_OBJECT *obj;
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ACPI_STATUS status;
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if (acpi_disabled("cpu") || acpi_get_type(dev) != ACPI_TYPE_PROCESSOR)
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return (ENXIO);
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handle = acpi_get_handle(dev);
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if (cpu_softc == NULL)
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cpu_softc = malloc(sizeof(struct acpi_cpu_softc *) *
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(mp_maxid + 1), M_TEMP /* XXX */, M_WAITOK | M_ZERO);
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/* Get our Processor object. */
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buf.Pointer = NULL;
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buf.Length = ACPI_ALLOCATE_BUFFER;
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status = AcpiEvaluateObject(handle, NULL, NULL, &buf);
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if (ACPI_FAILURE(status)) {
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device_printf(dev, "probe failed to get Processor obj - %s\n",
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AcpiFormatException(status));
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return (ENXIO);
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}
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obj = (ACPI_OBJECT *)buf.Pointer;
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if (obj->Type != ACPI_TYPE_PROCESSOR) {
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device_printf(dev, "Processor object has bad type %d\n", obj->Type);
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AcpiOsFree(obj);
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return (ENXIO);
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}
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/*
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* Find the processor associated with our unit. We could use the
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* ProcId as a key, however, some boxes do not have the same values
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* in their Processor object as the ProcId values in the MADT.
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*/
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acpi_id = obj->Processor.ProcId;
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AcpiOsFree(obj);
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if (acpi_pcpu_get_id(device_get_unit(dev), &acpi_id, &cpu_id) != 0)
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return (ENXIO);
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/*
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* Check if we already probed this processor. We scan the bus twice
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* so it's possible we've already seen this one.
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*/
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if (cpu_softc[cpu_id] != NULL)
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return (ENXIO);
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/* Mark this processor as in-use and save our derived id for attach. */
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cpu_softc[cpu_id] = (void *)1;
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acpi_set_private(dev, (void*)(intptr_t)cpu_id);
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device_set_desc(dev, "ACPI CPU");
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return (0);
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}
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static int
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acpi_cpu_attach(device_t dev)
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{
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ACPI_BUFFER buf;
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ACPI_OBJECT arg[4], *obj;
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ACPI_OBJECT_LIST arglist;
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struct pcpu *pcpu_data;
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struct acpi_cpu_softc *sc;
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struct acpi_softc *acpi_sc;
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ACPI_STATUS status;
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u_int features;
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int cpu_id, drv_count, i;
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driver_t **drivers;
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uint32_t cap_set[3];
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/* UUID needed by _OSC evaluation */
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static uint8_t cpu_oscuuid[16] = { 0x16, 0xA6, 0x77, 0x40, 0x0C, 0x29,
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0xBE, 0x47, 0x9E, 0xBD, 0xD8, 0x70,
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0x58, 0x71, 0x39, 0x53 };
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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sc = device_get_softc(dev);
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sc->cpu_dev = dev;
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sc->cpu_handle = acpi_get_handle(dev);
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cpu_id = (int)(intptr_t)acpi_get_private(dev);
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cpu_softc[cpu_id] = sc;
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pcpu_data = pcpu_find(cpu_id);
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pcpu_data->pc_device = dev;
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sc->cpu_pcpu = pcpu_data;
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cpu_smi_cmd = AcpiGbl_FADT.SmiCommand;
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cpu_cst_cnt = AcpiGbl_FADT.CstControl;
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buf.Pointer = NULL;
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buf.Length = ACPI_ALLOCATE_BUFFER;
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status = AcpiEvaluateObject(sc->cpu_handle, NULL, NULL, &buf);
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if (ACPI_FAILURE(status)) {
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device_printf(dev, "attach failed to get Processor obj - %s\n",
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AcpiFormatException(status));
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return (ENXIO);
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}
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obj = (ACPI_OBJECT *)buf.Pointer;
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sc->cpu_p_blk = obj->Processor.PblkAddress;
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sc->cpu_p_blk_len = obj->Processor.PblkLength;
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sc->cpu_acpi_id = obj->Processor.ProcId;
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AcpiOsFree(obj);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "acpi_cpu%d: P_BLK at %#x/%d\n",
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device_get_unit(dev), sc->cpu_p_blk, sc->cpu_p_blk_len));
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/*
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* If this is the first cpu we attach, create and initialize the generic
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* resources that will be used by all acpi cpu devices.
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*/
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if (device_get_unit(dev) == 0) {
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/* Assume we won't be using generic Cx mode by default */
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cpu_cx_generic = FALSE;
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/* Install hw.acpi.cpu sysctl tree */
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acpi_sc = acpi_device_get_parent_softc(dev);
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sysctl_ctx_init(&cpu_sysctl_ctx);
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cpu_sysctl_tree = SYSCTL_ADD_NODE(&cpu_sysctl_ctx,
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SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO, "cpu",
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CTLFLAG_RD, 0, "node for CPU children");
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/* Queue post cpu-probing task handler */
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AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cpu_startup, NULL);
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}
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/*
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* Before calling any CPU methods, collect child driver feature hints
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* and notify ACPI of them. We support unified SMP power control
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* so advertise this ourselves. Note this is not the same as independent
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* SMP control where each CPU can have different settings.
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*/
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sc->cpu_features = ACPI_CAP_SMP_SAME | ACPI_CAP_SMP_SAME_C3;
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if (devclass_get_drivers(acpi_cpu_devclass, &drivers, &drv_count) == 0) {
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for (i = 0; i < drv_count; i++) {
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if (ACPI_GET_FEATURES(drivers[i], &features) == 0)
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sc->cpu_features |= features;
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}
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free(drivers, M_TEMP);
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}
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/*
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* CPU capabilities are specified in
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* Intel Processor Vendor-Specific ACPI Interface Specification.
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*/
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if (sc->cpu_features) {
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arglist.Pointer = arg;
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arglist.Count = 4;
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arg[0].Type = ACPI_TYPE_BUFFER;
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arg[0].Buffer.Length = sizeof(cpu_oscuuid);
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arg[0].Buffer.Pointer = cpu_oscuuid; /* UUID */
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arg[1].Type = ACPI_TYPE_INTEGER;
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arg[1].Integer.Value = 1; /* revision */
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arg[2].Type = ACPI_TYPE_INTEGER;
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arg[2].Integer.Value = 1; /* count */
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arg[3].Type = ACPI_TYPE_BUFFER;
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arg[3].Buffer.Length = sizeof(cap_set); /* Capabilities buffer */
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arg[3].Buffer.Pointer = (uint8_t *)cap_set;
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cap_set[0] = 0; /* status */
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cap_set[1] = sc->cpu_features;
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status = AcpiEvaluateObject(sc->cpu_handle, "_OSC", &arglist, NULL);
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if (ACPI_SUCCESS(status)) {
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if (cap_set[0] != 0)
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device_printf(dev, "_OSC returned status %#x\n", cap_set[0]);
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}
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else {
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arglist.Pointer = arg;
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arglist.Count = 1;
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arg[0].Type = ACPI_TYPE_BUFFER;
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arg[0].Buffer.Length = sizeof(cap_set);
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arg[0].Buffer.Pointer = (uint8_t *)cap_set;
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cap_set[0] = 1; /* revision */
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cap_set[1] = 1; /* number of capabilities integers */
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cap_set[2] = sc->cpu_features;
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AcpiEvaluateObject(sc->cpu_handle, "_PDC", &arglist, NULL);
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}
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}
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/* Probe for Cx state support. */
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acpi_cpu_cx_probe(sc);
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return (0);
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}
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static void
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acpi_cpu_postattach(void *unused __unused)
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{
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device_t *devices;
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int err;
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int i, n;
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err = devclass_get_devices(acpi_cpu_devclass, &devices, &n);
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if (err != 0) {
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printf("devclass_get_devices(acpi_cpu_devclass) failed\n");
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return;
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}
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for (i = 0; i < n; i++)
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bus_generic_probe(devices[i]);
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for (i = 0; i < n; i++)
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bus_generic_attach(devices[i]);
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free(devices, M_TEMP);
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}
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SYSINIT(acpi_cpu, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE,
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acpi_cpu_postattach, NULL);
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/*
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* Disable any entry to the idle function during suspend and re-enable it
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* during resume.
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*/
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static int
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acpi_cpu_suspend(device_t dev)
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{
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int error;
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error = bus_generic_suspend(dev);
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if (error)
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return (error);
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cpu_disable_idle = TRUE;
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return (0);
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}
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static int
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acpi_cpu_resume(device_t dev)
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{
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cpu_disable_idle = FALSE;
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return (bus_generic_resume(dev));
|
|
}
|
|
|
|
/*
|
|
* Find the nth present CPU and return its pc_cpuid as well as set the
|
|
* pc_acpi_id from the most reliable source.
|
|
*/
|
|
static int
|
|
acpi_pcpu_get_id(uint32_t idx, uint32_t *acpi_id, uint32_t *cpu_id)
|
|
{
|
|
struct pcpu *pcpu_data;
|
|
uint32_t i;
|
|
|
|
KASSERT(acpi_id != NULL, ("Null acpi_id"));
|
|
KASSERT(cpu_id != NULL, ("Null cpu_id"));
|
|
CPU_FOREACH(i) {
|
|
pcpu_data = pcpu_find(i);
|
|
KASSERT(pcpu_data != NULL, ("no pcpu data for %d", i));
|
|
if (idx-- == 0) {
|
|
/*
|
|
* If pc_acpi_id was not initialized (e.g., a non-APIC UP box)
|
|
* override it with the value from the ASL. Otherwise, if the
|
|
* two don't match, prefer the MADT-derived value. Finally,
|
|
* return the pc_cpuid to reference this processor.
|
|
*/
|
|
if (pcpu_data->pc_acpi_id == 0xffffffff)
|
|
pcpu_data->pc_acpi_id = *acpi_id;
|
|
else if (pcpu_data->pc_acpi_id != *acpi_id)
|
|
*acpi_id = pcpu_data->pc_acpi_id;
|
|
*cpu_id = pcpu_data->pc_cpuid;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
return (ESRCH);
|
|
}
|
|
|
|
static struct resource_list *
|
|
acpi_cpu_get_rlist(device_t dev, device_t child)
|
|
{
|
|
struct acpi_cpu_device *ad;
|
|
|
|
ad = device_get_ivars(child);
|
|
if (ad == NULL)
|
|
return (NULL);
|
|
return (&ad->ad_rl);
|
|
}
|
|
|
|
static device_t
|
|
acpi_cpu_add_child(device_t dev, u_int order, const char *name, int unit)
|
|
{
|
|
struct acpi_cpu_device *ad;
|
|
device_t child;
|
|
|
|
if ((ad = malloc(sizeof(*ad), M_TEMP, M_NOWAIT | M_ZERO)) == NULL)
|
|
return (NULL);
|
|
|
|
resource_list_init(&ad->ad_rl);
|
|
|
|
child = device_add_child_ordered(dev, order, name, unit);
|
|
if (child != NULL)
|
|
device_set_ivars(child, ad);
|
|
else
|
|
free(ad, M_TEMP);
|
|
return (child);
|
|
}
|
|
|
|
static int
|
|
acpi_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
|
|
{
|
|
struct acpi_cpu_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
switch (index) {
|
|
case ACPI_IVAR_HANDLE:
|
|
*result = (uintptr_t)sc->cpu_handle;
|
|
break;
|
|
case CPU_IVAR_PCPU:
|
|
*result = (uintptr_t)sc->cpu_pcpu;
|
|
break;
|
|
#if defined(__amd64__) || defined(__i386__)
|
|
case CPU_IVAR_NOMINAL_MHZ:
|
|
if (tsc_is_invariant) {
|
|
*result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) / 1000000);
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
#endif
|
|
default:
|
|
return (ENOENT);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
acpi_cpu_shutdown(device_t dev)
|
|
{
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
|
|
|
|
/* Allow children to shutdown first. */
|
|
bus_generic_shutdown(dev);
|
|
|
|
/*
|
|
* Disable any entry to the idle function. There is a small race where
|
|
* an idle thread have passed this check but not gone to sleep. This
|
|
* is ok since device_shutdown() does not free the softc, otherwise
|
|
* we'd have to be sure all threads were evicted before returning.
|
|
*/
|
|
cpu_disable_idle = TRUE;
|
|
|
|
return_VALUE (0);
|
|
}
|
|
|
|
static void
|
|
acpi_cpu_cx_probe(struct acpi_cpu_softc *sc)
|
|
{
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
|
|
|
|
/* Use initial sleep value of 1 sec. to start with lowest idle state. */
|
|
sc->cpu_prev_sleep = 1000000;
|
|
sc->cpu_cx_lowest = 0;
|
|
|
|
/*
|
|
* Check for the ACPI 2.0 _CST sleep states object. If we can't find
|
|
* any, we'll revert to generic FADT/P_BLK Cx control method which will
|
|
* be handled by acpi_cpu_startup. We need to defer to after having
|
|
* probed all the cpus in the system before probing for generic Cx
|
|
* states as we may already have found cpus with valid _CST packages
|
|
*/
|
|
if (!cpu_cx_generic && acpi_cpu_cx_cst(sc) != 0) {
|
|
/*
|
|
* We were unable to find a _CST package for this cpu or there
|
|
* was an error parsing it. Switch back to generic mode.
|
|
*/
|
|
cpu_cx_generic = TRUE;
|
|
if (bootverbose)
|
|
device_printf(sc->cpu_dev, "switching to generic Cx mode\n");
|
|
}
|
|
|
|
/*
|
|
* TODO: _CSD Package should be checked here.
|
|
*/
|
|
}
|
|
|
|
static void
|
|
acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc)
|
|
{
|
|
ACPI_GENERIC_ADDRESS gas;
|
|
struct acpi_cx *cx_ptr;
|
|
|
|
sc->cpu_cx_count = 0;
|
|
cx_ptr = sc->cpu_cx_states;
|
|
|
|
/* Use initial sleep value of 1 sec. to start with lowest idle state. */
|
|
sc->cpu_prev_sleep = 1000000;
|
|
|
|
/* C1 has been required since just after ACPI 1.0 */
|
|
cx_ptr->type = ACPI_STATE_C1;
|
|
cx_ptr->trans_lat = 0;
|
|
cx_ptr++;
|
|
sc->cpu_cx_count++;
|
|
|
|
/*
|
|
* The spec says P_BLK must be 6 bytes long. However, some systems
|
|
* use it to indicate a fractional set of features present so we
|
|
* take 5 as C2. Some may also have a value of 7 to indicate
|
|
* another C3 but most use _CST for this (as required) and having
|
|
* "only" C1-C3 is not a hardship.
|
|
*/
|
|
if (sc->cpu_p_blk_len < 5)
|
|
return;
|
|
|
|
/* Validate and allocate resources for C2 (P_LVL2). */
|
|
gas.SpaceId = ACPI_ADR_SPACE_SYSTEM_IO;
|
|
gas.BitWidth = 8;
|
|
if (AcpiGbl_FADT.C2Latency <= 100) {
|
|
gas.Address = sc->cpu_p_blk + 4;
|
|
acpi_bus_alloc_gas(sc->cpu_dev, &cx_ptr->res_type, &sc->cpu_rid,
|
|
&gas, &cx_ptr->p_lvlx, RF_SHAREABLE);
|
|
if (cx_ptr->p_lvlx != NULL) {
|
|
sc->cpu_rid++;
|
|
cx_ptr->type = ACPI_STATE_C2;
|
|
cx_ptr->trans_lat = AcpiGbl_FADT.C2Latency;
|
|
cx_ptr++;
|
|
sc->cpu_cx_count++;
|
|
}
|
|
}
|
|
if (sc->cpu_p_blk_len < 6)
|
|
return;
|
|
|
|
/* Validate and allocate resources for C3 (P_LVL3). */
|
|
if (AcpiGbl_FADT.C3Latency <= 1000 && !(cpu_quirks & CPU_QUIRK_NO_C3)) {
|
|
gas.Address = sc->cpu_p_blk + 5;
|
|
acpi_bus_alloc_gas(sc->cpu_dev, &cx_ptr->res_type, &sc->cpu_rid, &gas,
|
|
&cx_ptr->p_lvlx, RF_SHAREABLE);
|
|
if (cx_ptr->p_lvlx != NULL) {
|
|
sc->cpu_rid++;
|
|
cx_ptr->type = ACPI_STATE_C3;
|
|
cx_ptr->trans_lat = AcpiGbl_FADT.C3Latency;
|
|
cx_ptr++;
|
|
sc->cpu_cx_count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Parse a _CST package and set up its Cx states. Since the _CST object
|
|
* can change dynamically, our notify handler may call this function
|
|
* to clean up and probe the new _CST package.
|
|
*/
|
|
static int
|
|
acpi_cpu_cx_cst(struct acpi_cpu_softc *sc)
|
|
{
|
|
struct acpi_cx *cx_ptr;
|
|
ACPI_STATUS status;
|
|
ACPI_BUFFER buf;
|
|
ACPI_OBJECT *top;
|
|
ACPI_OBJECT *pkg;
|
|
uint32_t count;
|
|
int i;
|
|
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
|
|
|
|
buf.Pointer = NULL;
|
|
buf.Length = ACPI_ALLOCATE_BUFFER;
|
|
status = AcpiEvaluateObject(sc->cpu_handle, "_CST", NULL, &buf);
|
|
if (ACPI_FAILURE(status))
|
|
return (ENXIO);
|
|
|
|
/* _CST is a package with a count and at least one Cx package. */
|
|
top = (ACPI_OBJECT *)buf.Pointer;
|
|
if (!ACPI_PKG_VALID(top, 2) || acpi_PkgInt32(top, 0, &count) != 0) {
|
|
device_printf(sc->cpu_dev, "invalid _CST package\n");
|
|
AcpiOsFree(buf.Pointer);
|
|
return (ENXIO);
|
|
}
|
|
if (count != top->Package.Count - 1) {
|
|
device_printf(sc->cpu_dev, "invalid _CST state count (%d != %d)\n",
|
|
count, top->Package.Count - 1);
|
|
count = top->Package.Count - 1;
|
|
}
|
|
if (count > MAX_CX_STATES) {
|
|
device_printf(sc->cpu_dev, "_CST has too many states (%d)\n", count);
|
|
count = MAX_CX_STATES;
|
|
}
|
|
|
|
sc->cpu_non_c3 = 0;
|
|
sc->cpu_cx_count = 0;
|
|
cx_ptr = sc->cpu_cx_states;
|
|
|
|
/*
|
|
* C1 has been required since just after ACPI 1.0.
|
|
* Reserve the first slot for it.
|
|
*/
|
|
cx_ptr->type = ACPI_STATE_C0;
|
|
cx_ptr++;
|
|
sc->cpu_cx_count++;
|
|
|
|
/* Set up all valid states. */
|
|
for (i = 0; i < count; i++) {
|
|
pkg = &top->Package.Elements[i + 1];
|
|
if (!ACPI_PKG_VALID(pkg, 4) ||
|
|
acpi_PkgInt32(pkg, 1, &cx_ptr->type) != 0 ||
|
|
acpi_PkgInt32(pkg, 2, &cx_ptr->trans_lat) != 0 ||
|
|
acpi_PkgInt32(pkg, 3, &cx_ptr->power) != 0) {
|
|
|
|
device_printf(sc->cpu_dev, "skipping invalid Cx state package\n");
|
|
continue;
|
|
}
|
|
|
|
/* Validate the state to see if we should use it. */
|
|
switch (cx_ptr->type) {
|
|
case ACPI_STATE_C1:
|
|
if (sc->cpu_cx_states[0].type == ACPI_STATE_C0) {
|
|
/* This is the first C1 state. Use the reserved slot. */
|
|
sc->cpu_cx_states[0] = *cx_ptr;
|
|
} else {
|
|
sc->cpu_non_c3 = i;
|
|
cx_ptr++;
|
|
sc->cpu_cx_count++;
|
|
}
|
|
continue;
|
|
case ACPI_STATE_C2:
|
|
sc->cpu_non_c3 = i;
|
|
break;
|
|
case ACPI_STATE_C3:
|
|
default:
|
|
if ((cpu_quirks & CPU_QUIRK_NO_C3) != 0) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"acpi_cpu%d: C3[%d] not available.\n",
|
|
device_get_unit(sc->cpu_dev), i));
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
#ifdef notyet
|
|
/* Free up any previous register. */
|
|
if (cx_ptr->p_lvlx != NULL) {
|
|
bus_release_resource(sc->cpu_dev, 0, 0, cx_ptr->p_lvlx);
|
|
cx_ptr->p_lvlx = NULL;
|
|
}
|
|
#endif
|
|
|
|
/* Allocate the control register for C2 or C3. */
|
|
acpi_PkgGas(sc->cpu_dev, pkg, 0, &cx_ptr->res_type, &sc->cpu_rid,
|
|
&cx_ptr->p_lvlx, RF_SHAREABLE);
|
|
if (cx_ptr->p_lvlx) {
|
|
sc->cpu_rid++;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"acpi_cpu%d: Got C%d - %d latency\n",
|
|
device_get_unit(sc->cpu_dev), cx_ptr->type,
|
|
cx_ptr->trans_lat));
|
|
cx_ptr++;
|
|
sc->cpu_cx_count++;
|
|
}
|
|
}
|
|
AcpiOsFree(buf.Pointer);
|
|
|
|
/* If C1 state was not found, we need one now. */
|
|
cx_ptr = sc->cpu_cx_states;
|
|
if (cx_ptr->type == ACPI_STATE_C0) {
|
|
cx_ptr->type = ACPI_STATE_C1;
|
|
cx_ptr->trans_lat = 0;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Call this *after* all CPUs have been attached.
|
|
*/
|
|
static void
|
|
acpi_cpu_startup(void *arg)
|
|
{
|
|
struct acpi_cpu_softc *sc;
|
|
int i;
|
|
|
|
/* Get set of CPU devices */
|
|
devclass_get_devices(acpi_cpu_devclass, &cpu_devices, &cpu_ndevices);
|
|
|
|
/*
|
|
* Setup any quirks that might necessary now that we have probed
|
|
* all the CPUs
|
|
*/
|
|
acpi_cpu_quirks();
|
|
|
|
cpu_cx_count = 0;
|
|
if (cpu_cx_generic) {
|
|
/*
|
|
* We are using generic Cx mode, probe for available Cx states
|
|
* for all processors.
|
|
*/
|
|
for (i = 0; i < cpu_ndevices; i++) {
|
|
sc = device_get_softc(cpu_devices[i]);
|
|
acpi_cpu_generic_cx_probe(sc);
|
|
if (sc->cpu_cx_count > cpu_cx_count)
|
|
cpu_cx_count = sc->cpu_cx_count;
|
|
}
|
|
|
|
/*
|
|
* Find the highest Cx state common to all CPUs
|
|
* in the system, taking quirks into account.
|
|
*/
|
|
for (i = 0; i < cpu_ndevices; i++) {
|
|
sc = device_get_softc(cpu_devices[i]);
|
|
if (sc->cpu_cx_count < cpu_cx_count)
|
|
cpu_cx_count = sc->cpu_cx_count;
|
|
}
|
|
} else {
|
|
/*
|
|
* We are using _CST mode, remove C3 state if necessary.
|
|
* Update the largest Cx state supported in the global cpu_cx_count.
|
|
* It will be used in the global Cx sysctl handler.
|
|
* As we now know for sure that we will be using _CST mode
|
|
* install our notify handler.
|
|
*/
|
|
for (i = 0; i < cpu_ndevices; i++) {
|
|
sc = device_get_softc(cpu_devices[i]);
|
|
if (cpu_quirks & CPU_QUIRK_NO_C3) {
|
|
sc->cpu_cx_count = sc->cpu_non_c3 + 1;
|
|
}
|
|
if (sc->cpu_cx_count > cpu_cx_count)
|
|
cpu_cx_count = sc->cpu_cx_count;
|
|
AcpiInstallNotifyHandler(sc->cpu_handle, ACPI_DEVICE_NOTIFY,
|
|
acpi_cpu_notify, sc);
|
|
}
|
|
}
|
|
|
|
/* Perform Cx final initialization. */
|
|
for (i = 0; i < cpu_ndevices; i++) {
|
|
sc = device_get_softc(cpu_devices[i]);
|
|
acpi_cpu_startup_cx(sc);
|
|
}
|
|
|
|
/* Add a sysctl handler to handle global Cx lowest setting */
|
|
SYSCTL_ADD_PROC(&cpu_sysctl_ctx, SYSCTL_CHILDREN(cpu_sysctl_tree),
|
|
OID_AUTO, "cx_lowest", CTLTYPE_STRING | CTLFLAG_RW,
|
|
NULL, 0, acpi_cpu_global_cx_lowest_sysctl, "A",
|
|
"Global lowest Cx sleep state to use");
|
|
|
|
/* Take over idling from cpu_idle_default(). */
|
|
cpu_cx_lowest = 0;
|
|
cpu_disable_idle = FALSE;
|
|
cpu_idle_hook = acpi_cpu_idle;
|
|
}
|
|
|
|
static void
|
|
acpi_cpu_cx_list(struct acpi_cpu_softc *sc)
|
|
{
|
|
struct sbuf sb;
|
|
int i;
|
|
|
|
/*
|
|
* Set up the list of Cx states
|
|
*/
|
|
sc->cpu_non_c3 = 0;
|
|
sbuf_new(&sb, sc->cpu_cx_supported, sizeof(sc->cpu_cx_supported),
|
|
SBUF_FIXEDLEN);
|
|
for (i = 0; i < sc->cpu_cx_count; i++) {
|
|
sbuf_printf(&sb, "C%d/%d ", i + 1, sc->cpu_cx_states[i].trans_lat);
|
|
if (sc->cpu_cx_states[i].type < ACPI_STATE_C3)
|
|
sc->cpu_non_c3 = i;
|
|
else
|
|
cpu_can_deep_sleep = 1;
|
|
}
|
|
sbuf_trim(&sb);
|
|
sbuf_finish(&sb);
|
|
}
|
|
|
|
static void
|
|
acpi_cpu_startup_cx(struct acpi_cpu_softc *sc)
|
|
{
|
|
acpi_cpu_cx_list(sc);
|
|
|
|
SYSCTL_ADD_STRING(&sc->cpu_sysctl_ctx,
|
|
SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)),
|
|
OID_AUTO, "cx_supported", CTLFLAG_RD,
|
|
sc->cpu_cx_supported, 0,
|
|
"Cx/microsecond values for supported Cx states");
|
|
SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx,
|
|
SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)),
|
|
OID_AUTO, "cx_lowest", CTLTYPE_STRING | CTLFLAG_RW,
|
|
(void *)sc, 0, acpi_cpu_cx_lowest_sysctl, "A",
|
|
"lowest Cx sleep state to use");
|
|
SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx,
|
|
SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)),
|
|
OID_AUTO, "cx_usage", CTLTYPE_STRING | CTLFLAG_RD,
|
|
(void *)sc, 0, acpi_cpu_usage_sysctl, "A",
|
|
"percent usage for each Cx state");
|
|
|
|
#ifdef notyet
|
|
/* Signal platform that we can handle _CST notification. */
|
|
if (!cpu_cx_generic && cpu_cst_cnt != 0) {
|
|
ACPI_LOCK(acpi);
|
|
AcpiOsWritePort(cpu_smi_cmd, cpu_cst_cnt, 8);
|
|
ACPI_UNLOCK(acpi);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Idle the CPU in the lowest state possible. This function is called with
|
|
* interrupts disabled. Note that once it re-enables interrupts, a task
|
|
* switch can occur so do not access shared data (i.e. the softc) after
|
|
* interrupts are re-enabled.
|
|
*/
|
|
static void
|
|
acpi_cpu_idle()
|
|
{
|
|
struct acpi_cpu_softc *sc;
|
|
struct acpi_cx *cx_next;
|
|
uint32_t start_time, end_time;
|
|
int bm_active, cx_next_idx, i;
|
|
|
|
/* If disabled, return immediately. */
|
|
if (cpu_disable_idle) {
|
|
ACPI_ENABLE_IRQS();
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Look up our CPU id to get our softc. If it's NULL, we'll use C1
|
|
* since there is no ACPI processor object for this CPU. This occurs
|
|
* for logical CPUs in the HTT case.
|
|
*/
|
|
sc = cpu_softc[PCPU_GET(cpuid)];
|
|
if (sc == NULL) {
|
|
acpi_cpu_c1();
|
|
return;
|
|
}
|
|
|
|
/* Find the lowest state that has small enough latency. */
|
|
cx_next_idx = 0;
|
|
if (cpu_disable_deep_sleep)
|
|
i = min(sc->cpu_cx_lowest, sc->cpu_non_c3);
|
|
else
|
|
i = sc->cpu_cx_lowest;
|
|
for (; i >= 0; i--) {
|
|
if (sc->cpu_cx_states[i].trans_lat * 3 <= sc->cpu_prev_sleep) {
|
|
cx_next_idx = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check for bus master activity. If there was activity, clear
|
|
* the bit and use the lowest non-C3 state. Note that the USB
|
|
* driver polling for new devices keeps this bit set all the
|
|
* time if USB is loaded.
|
|
*/
|
|
if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) {
|
|
AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, &bm_active);
|
|
if (bm_active != 0) {
|
|
AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, 1);
|
|
cx_next_idx = min(cx_next_idx, sc->cpu_non_c3);
|
|
}
|
|
}
|
|
|
|
/* Select the next state and update statistics. */
|
|
cx_next = &sc->cpu_cx_states[cx_next_idx];
|
|
sc->cpu_cx_stats[cx_next_idx]++;
|
|
KASSERT(cx_next->type != ACPI_STATE_C0, ("acpi_cpu_idle: C0 sleep"));
|
|
|
|
/*
|
|
* Execute HLT (or equivalent) and wait for an interrupt. We can't
|
|
* precisely calculate the time spent in C1 since the place we wake up
|
|
* is an ISR. Assume we slept no more then half of quantum, unless
|
|
* we are called inside critical section, delaying context switch.
|
|
*/
|
|
if (cx_next->type == ACPI_STATE_C1) {
|
|
AcpiHwRead(&start_time, &AcpiGbl_FADT.XPmTimerBlock);
|
|
acpi_cpu_c1();
|
|
AcpiHwRead(&end_time, &AcpiGbl_FADT.XPmTimerBlock);
|
|
end_time = PM_USEC(acpi_TimerDelta(end_time, start_time));
|
|
if (curthread->td_critnest == 0)
|
|
end_time = min(end_time, 500000 / hz);
|
|
sc->cpu_prev_sleep = (sc->cpu_prev_sleep * 3 + end_time) / 4;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* For C3, disable bus master arbitration and enable bus master wake
|
|
* if BM control is available, otherwise flush the CPU cache.
|
|
*/
|
|
if (cx_next->type == ACPI_STATE_C3) {
|
|
if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) {
|
|
AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 1);
|
|
AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 1);
|
|
} else
|
|
ACPI_FLUSH_CPU_CACHE();
|
|
}
|
|
|
|
/*
|
|
* Read from P_LVLx to enter C2(+), checking time spent asleep.
|
|
* Use the ACPI timer for measuring sleep time. Since we need to
|
|
* get the time very close to the CPU start/stop clock logic, this
|
|
* is the only reliable time source.
|
|
*/
|
|
AcpiHwRead(&start_time, &AcpiGbl_FADT.XPmTimerBlock);
|
|
CPU_GET_REG(cx_next->p_lvlx, 1);
|
|
|
|
/*
|
|
* Read the end time twice. Since it may take an arbitrary time
|
|
* to enter the idle state, the first read may be executed before
|
|
* the processor has stopped. Doing it again provides enough
|
|
* margin that we are certain to have a correct value.
|
|
*/
|
|
AcpiHwRead(&end_time, &AcpiGbl_FADT.XPmTimerBlock);
|
|
AcpiHwRead(&end_time, &AcpiGbl_FADT.XPmTimerBlock);
|
|
|
|
/* Enable bus master arbitration and disable bus master wakeup. */
|
|
if (cx_next->type == ACPI_STATE_C3 &&
|
|
(cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) {
|
|
AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 0);
|
|
AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0);
|
|
}
|
|
ACPI_ENABLE_IRQS();
|
|
|
|
/* Find the actual time asleep in microseconds. */
|
|
end_time = acpi_TimerDelta(end_time, start_time);
|
|
sc->cpu_prev_sleep = (sc->cpu_prev_sleep * 3 + PM_USEC(end_time)) / 4;
|
|
}
|
|
|
|
/*
|
|
* Re-evaluate the _CST object when we are notified that it changed.
|
|
*
|
|
* XXX Re-evaluation disabled until locking is done.
|
|
*/
|
|
static void
|
|
acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context)
|
|
{
|
|
struct acpi_cpu_softc *sc = (struct acpi_cpu_softc *)context;
|
|
struct acpi_cpu_softc *isc;
|
|
int i;
|
|
|
|
if (notify != ACPI_NOTIFY_CX_STATES)
|
|
return;
|
|
|
|
/* Update the list of Cx states. */
|
|
acpi_cpu_cx_cst(sc);
|
|
acpi_cpu_cx_list(sc);
|
|
|
|
/* Update the new lowest useable Cx state for all CPUs. */
|
|
ACPI_SERIAL_BEGIN(cpu);
|
|
cpu_cx_count = 0;
|
|
for (i = 0; i < cpu_ndevices; i++) {
|
|
isc = device_get_softc(cpu_devices[i]);
|
|
if (isc->cpu_cx_count > cpu_cx_count)
|
|
cpu_cx_count = isc->cpu_cx_count;
|
|
}
|
|
if (sc->cpu_cx_lowest < cpu_cx_lowest)
|
|
acpi_cpu_set_cx_lowest(sc, min(cpu_cx_lowest, sc->cpu_cx_count - 1));
|
|
ACPI_SERIAL_END(cpu);
|
|
}
|
|
|
|
static int
|
|
acpi_cpu_quirks(void)
|
|
{
|
|
device_t acpi_dev;
|
|
uint32_t val;
|
|
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
|
|
|
|
/*
|
|
* Bus mastering arbitration control is needed to keep caches coherent
|
|
* while sleeping in C3. If it's not present but a working flush cache
|
|
* instruction is present, flush the caches before entering C3 instead.
|
|
* Otherwise, just disable C3 completely.
|
|
*/
|
|
if (AcpiGbl_FADT.Pm2ControlBlock == 0 ||
|
|
AcpiGbl_FADT.Pm2ControlLength == 0) {
|
|
if ((AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD) &&
|
|
(AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD_FLUSH) == 0) {
|
|
cpu_quirks |= CPU_QUIRK_NO_BM_CTRL;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"acpi_cpu: no BM control, using flush cache method\n"));
|
|
} else {
|
|
cpu_quirks |= CPU_QUIRK_NO_C3;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"acpi_cpu: no BM control, C3 not available\n"));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we are using generic Cx mode, C3 on multiple CPUs requires using
|
|
* the expensive flush cache instruction.
|
|
*/
|
|
if (cpu_cx_generic && mp_ncpus > 1) {
|
|
cpu_quirks |= CPU_QUIRK_NO_BM_CTRL;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"acpi_cpu: SMP, using flush cache mode for C3\n"));
|
|
}
|
|
|
|
/* Look for various quirks of the PIIX4 part. */
|
|
acpi_dev = pci_find_device(PCI_VENDOR_INTEL, PCI_DEVICE_82371AB_3);
|
|
if (acpi_dev != NULL) {
|
|
switch (pci_get_revid(acpi_dev)) {
|
|
/*
|
|
* Disable C3 support for all PIIX4 chipsets. Some of these parts
|
|
* do not report the BMIDE status to the BM status register and
|
|
* others have a livelock bug if Type-F DMA is enabled. Linux
|
|
* works around the BMIDE bug by reading the BM status directly
|
|
* but we take the simpler approach of disabling C3 for these
|
|
* parts.
|
|
*
|
|
* See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
|
|
* Livelock") from the January 2002 PIIX4 specification update.
|
|
* Applies to all PIIX4 models.
|
|
*
|
|
* Also, make sure that all interrupts cause a "Stop Break"
|
|
* event to exit from C2 state.
|
|
* Also, BRLD_EN_BM (ACPI_BITREG_BUS_MASTER_RLD in ACPI-speak)
|
|
* should be set to zero, otherwise it causes C2 to short-sleep.
|
|
* PIIX4 doesn't properly support C3 and bus master activity
|
|
* need not break out of C2.
|
|
*/
|
|
case PCI_REVISION_A_STEP:
|
|
case PCI_REVISION_B_STEP:
|
|
case PCI_REVISION_4E:
|
|
case PCI_REVISION_4M:
|
|
cpu_quirks |= CPU_QUIRK_NO_C3;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"acpi_cpu: working around PIIX4 bug, disabling C3\n"));
|
|
|
|
val = pci_read_config(acpi_dev, PIIX4_DEVACTB_REG, 4);
|
|
if ((val & PIIX4_STOP_BREAK_MASK) != PIIX4_STOP_BREAK_MASK) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"acpi_cpu: PIIX4: enabling IRQs to generate Stop Break\n"));
|
|
val |= PIIX4_STOP_BREAK_MASK;
|
|
pci_write_config(acpi_dev, PIIX4_DEVACTB_REG, val, 4);
|
|
}
|
|
AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_RLD, &val);
|
|
if (val) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"acpi_cpu: PIIX4: reset BRLD_EN_BM\n"));
|
|
AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
acpi_cpu_usage_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct acpi_cpu_softc *sc;
|
|
struct sbuf sb;
|
|
char buf[128];
|
|
int i;
|
|
uintmax_t fract, sum, whole;
|
|
|
|
sc = (struct acpi_cpu_softc *) arg1;
|
|
sum = 0;
|
|
for (i = 0; i < sc->cpu_cx_count; i++)
|
|
sum += sc->cpu_cx_stats[i];
|
|
sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
|
|
for (i = 0; i < sc->cpu_cx_count; i++) {
|
|
if (sum > 0) {
|
|
whole = (uintmax_t)sc->cpu_cx_stats[i] * 100;
|
|
fract = (whole % sum) * 100;
|
|
sbuf_printf(&sb, "%u.%02u%% ", (u_int)(whole / sum),
|
|
(u_int)(fract / sum));
|
|
} else
|
|
sbuf_printf(&sb, "0.00%% ");
|
|
}
|
|
sbuf_printf(&sb, "last %dus", sc->cpu_prev_sleep);
|
|
sbuf_trim(&sb);
|
|
sbuf_finish(&sb);
|
|
sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
|
|
sbuf_delete(&sb);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
acpi_cpu_set_cx_lowest(struct acpi_cpu_softc *sc, int val)
|
|
{
|
|
int i;
|
|
|
|
ACPI_SERIAL_ASSERT(cpu);
|
|
sc->cpu_cx_lowest = val;
|
|
|
|
/* If not disabling, cache the new lowest non-C3 state. */
|
|
sc->cpu_non_c3 = 0;
|
|
for (i = sc->cpu_cx_lowest; i >= 0; i--) {
|
|
if (sc->cpu_cx_states[i].type < ACPI_STATE_C3) {
|
|
sc->cpu_non_c3 = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Reset the statistics counters. */
|
|
bzero(sc->cpu_cx_stats, sizeof(sc->cpu_cx_stats));
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct acpi_cpu_softc *sc;
|
|
char state[8];
|
|
int val, error;
|
|
|
|
sc = (struct acpi_cpu_softc *) arg1;
|
|
snprintf(state, sizeof(state), "C%d", sc->cpu_cx_lowest + 1);
|
|
error = sysctl_handle_string(oidp, state, sizeof(state), req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
if (strlen(state) < 2 || toupper(state[0]) != 'C')
|
|
return (EINVAL);
|
|
val = (int) strtol(state + 1, NULL, 10) - 1;
|
|
if (val < 0 || val > sc->cpu_cx_count - 1)
|
|
return (EINVAL);
|
|
|
|
ACPI_SERIAL_BEGIN(cpu);
|
|
acpi_cpu_set_cx_lowest(sc, val);
|
|
ACPI_SERIAL_END(cpu);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
acpi_cpu_global_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct acpi_cpu_softc *sc;
|
|
char state[8];
|
|
int val, error, i;
|
|
|
|
snprintf(state, sizeof(state), "C%d", cpu_cx_lowest + 1);
|
|
error = sysctl_handle_string(oidp, state, sizeof(state), req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
if (strlen(state) < 2 || toupper(state[0]) != 'C')
|
|
return (EINVAL);
|
|
val = (int) strtol(state + 1, NULL, 10) - 1;
|
|
if (val < 0 || val > cpu_cx_count - 1)
|
|
return (EINVAL);
|
|
cpu_cx_lowest = val;
|
|
|
|
/* Update the new lowest useable Cx state for all CPUs. */
|
|
ACPI_SERIAL_BEGIN(cpu);
|
|
for (i = 0; i < cpu_ndevices; i++) {
|
|
sc = device_get_softc(cpu_devices[i]);
|
|
acpi_cpu_set_cx_lowest(sc, min(val, sc->cpu_cx_count - 1));
|
|
}
|
|
ACPI_SERIAL_END(cpu);
|
|
|
|
return (0);
|
|
}
|