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08b994c07e
freebsd/sys/dev/acpica/acpi_cpu.c
Nate Lawson 08b994c07e Document a sysctl. 
Submitted by:	Craig Rodrigues <rodrigc@crodrigues.org>
2004-03-05 18:08:23 +00:00

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/*-
* Copyright (c) 2003 Nate Lawson (SDG)
* Copyright (c) 2001 Michael Smith
* 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 AUTHOR 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 AUTHOR 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>
__FBSDID("$FreeBSD$");
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/pcpu.h>
#include <sys/power.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/smp.h>
#include <dev/pci/pcivar.h>
#include <machine/atomic.h>
#include <machine/bus.h>
#ifdef __ia64__
#include <machine/pal.h>
#endif
#include <sys/rman.h>
#include "acpi.h"
#include <dev/acpica/acpivar.h>
/*
* Support for ACPI Processor devices, including ACPI 2.0 throttling
* and C[1-3] sleep states.
*
* TODO: implement scans of all CPUs to be sure all Cx states are
* equivalent.
*/
/* Hooks for the ACPI CA debugging infrastructure */
#define _COMPONENT ACPI_PROCESSOR
ACPI_MODULE_NAME("PROCESSOR")
struct acpi_cx {
struct resource *p_lvlx; /* Register to read to enter state. */
uint32_t type; /* C1-3 (C4 and up treated as C3). */
uint32_t trans_lat; /* Transition latency (usec). */
uint32_t power; /* Power consumed (mW). */
};
#define MAX_CX_STATES 8
struct acpi_cx_stats {
int long_slp; /* Count of sleeps >= trans_lat. */
int short_slp; /* Count of sleeps < trans_lat. */
};
struct acpi_cpu_softc {
device_t cpu_dev;
ACPI_HANDLE cpu_handle;
uint32_t acpi_id; /* ACPI processor id */
uint32_t cpu_p_blk; /* ACPI P_BLK location */
uint32_t cpu_p_blk_len; /* P_BLK length (must be 6). */
struct resource *cpu_p_cnt; /* Throttling control register */
struct acpi_cx cpu_cx_states[MAX_CX_STATES];
int cpu_cx_count; /* Number of valid Cx states. */
};
#define CPU_GET_REG(reg, width) \
(bus_space_read_ ## width(rman_get_bustag((reg)), \
rman_get_bushandle((reg)), 0))
#define CPU_SET_REG(reg, width, val) \
(bus_space_write_ ## width(rman_get_bustag((reg)), \
rman_get_bushandle((reg)), 0, (val)))
/*
* Speeds are stored in counts, from 1 to CPU_MAX_SPEED, and
* reported to the user in tenths of a percent.
*/
static uint32_t cpu_duty_offset;
static uint32_t cpu_duty_width;
#define CPU_MAX_SPEED (1 << cpu_duty_width)
#define CPU_SPEED_PERCENT(x) ((1000 * (x)) / CPU_MAX_SPEED)
#define CPU_SPEED_PRINTABLE(x) (CPU_SPEED_PERCENT(x) / 10), \
(CPU_SPEED_PERCENT(x) % 10)
#define CPU_P_CNT_THT_EN (1<<4)
#define PM_USEC(x) ((x) >> 2) /* ~4 clocks per usec (3.57955 Mhz) */
#define ACPI_CPU_NOTIFY_PERF_STATES 0x80 /* _PSS changed. */
#define ACPI_CPU_NOTIFY_CX_STATES 0x81 /* _CST changed. */
#define CPU_QUIRK_NO_C3 0x0001 /* C3-type states are not usable. */
#define CPU_QUIRK_NO_THROTTLE 0x0002 /* Throttling is not usable. */
#define PCI_VENDOR_INTEL 0x8086
#define PCI_DEVICE_82371AB_3 0x7113 /* PIIX4 chipset for quirks. */
#define PCI_REVISION_A_STEP 0
#define PCI_REVISION_B_STEP 1
#define PCI_REVISION_4E 2
#define PCI_REVISION_4M 3
/* Platform hardware resource information. */
static uint32_t cpu_smi_cmd; /* Value to write to SMI_CMD. */
static uint8_t cpu_pstate_cnt;/* Register to take over throttling. */
static uint8_t cpu_cst_cnt; /* Indicate we are _CST aware. */
static uint32_t cpu_rid; /* Driver-wide resource id. */
static uint32_t cpu_quirks; /* Indicate any hardware bugs. */
/* Runtime state. */
static int cpu_cx_count; /* Number of valid states */
static uint32_t cpu_cx_next; /* State to use for next sleep. */
static uint32_t cpu_non_c3; /* Index of lowest non-C3 state. */
static struct acpi_cx_stats cpu_cx_stats[MAX_CX_STATES];
static int cpu_idle_busy; /* Count of CPUs in acpi_cpu_idle. */
/* Values for sysctl. */
static uint32_t cpu_throttle_state;
static uint32_t cpu_throttle_max;
static int cpu_cx_lowest;
static char cpu_cx_supported[64];
static device_t *cpu_devices;
static int cpu_ndevices;
static struct acpi_cpu_softc **cpu_softc;
static struct sysctl_ctx_list acpi_cpu_sysctl_ctx;
static struct sysctl_oid *acpi_cpu_sysctl_tree;
static int acpi_cpu_probe(device_t dev);
static int acpi_cpu_attach(device_t dev);
static int acpi_pcpu_get_id(uint32_t idx, uint32_t *acpi_id,
uint32_t *cpu_id);
static int acpi_cpu_shutdown(device_t dev);
static int acpi_cpu_throttle_probe(struct acpi_cpu_softc *sc);
static int acpi_cpu_cx_probe(struct acpi_cpu_softc *sc);
static int acpi_cpu_cx_cst(struct acpi_cpu_softc *sc);
static void acpi_cpu_startup(void *arg);
static void acpi_cpu_startup_throttling(void);
static void acpi_cpu_startup_cx(void);
static void acpi_cpu_throttle_set(uint32_t speed);
static void acpi_cpu_idle(void);
static void acpi_cpu_c1(void);
static void acpi_pm_ticksub(uint32_t *end, const uint32_t *start);
static void acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context);
static int acpi_cpu_quirks(struct acpi_cpu_softc *sc);
static int acpi_cpu_throttle_sysctl(SYSCTL_HANDLER_ARGS);
static int acpi_cpu_history_sysctl(SYSCTL_HANDLER_ARGS);
static int acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS);
static device_method_t acpi_cpu_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, acpi_cpu_probe),
DEVMETHOD(device_attach, acpi_cpu_attach),
DEVMETHOD(device_shutdown, acpi_cpu_shutdown),
{0, 0}
};
static driver_t acpi_cpu_driver = {
"acpi_cpu",
acpi_cpu_methods,
sizeof(struct acpi_cpu_softc),
};
static devclass_t acpi_cpu_devclass;
DRIVER_MODULE(acpi_cpu, acpi, acpi_cpu_driver, acpi_cpu_devclass, 0, 0);
static int
acpi_cpu_probe(device_t dev)
{
if (!acpi_disabled("cpu") && acpi_get_type(dev) == ACPI_TYPE_PROCESSOR) {
device_set_desc(dev, "CPU");
if (cpu_softc == NULL)
cpu_softc = malloc(sizeof(struct acpi_cpu_softc *) *
(mp_maxid + 1), M_TEMP /* XXX */, M_WAITOK | M_ZERO);
return (0);
}
return (ENXIO);
}
static int
acpi_cpu_attach(device_t dev)
{
struct acpi_cpu_softc *sc;
struct acpi_softc *acpi_sc;
ACPI_OBJECT pobj;
ACPI_BUFFER buf;
ACPI_STATUS status;
int thr_ret, cx_ret, cpu_id;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
sc = device_get_softc(dev);
sc->cpu_dev = dev;
sc->cpu_handle = acpi_get_handle(dev);
/* Get our Processor object. */
buf.Pointer = &pobj;
buf.Length = sizeof(pobj);
status = AcpiEvaluateObject(sc->cpu_handle, NULL, NULL, &buf);
if (ACPI_FAILURE(status)) {
device_printf(dev, "Couldn't get Processor object - %s\n",
AcpiFormatException(status));
return_VALUE (ENXIO);
}
if (pobj.Type != ACPI_TYPE_PROCESSOR) {
device_printf(dev, "Processor object has bad type %d\n", pobj.Type);
return_VALUE (ENXIO);
}
/*
* Find the processor associated with our unit. We could use the
* ProcId as a key, however, some boxes do not have the same values
* in their Processor object as the ProcId values in the MADT.
*/
sc->acpi_id = pobj.Processor.ProcId;
if (acpi_pcpu_get_id(device_get_unit(dev), &sc->acpi_id, &cpu_id) != 0)
return_VALUE (ENXIO);
/*
* Check if we already probed this processor. We scan the bus twice
* so it's possible we've already seen this one.
*/
if (cpu_softc[cpu_id] != NULL)
return (ENXIO);
cpu_softc[cpu_id] = sc;
/* Get various global values from the Processor object. */
sc->cpu_p_blk = pobj.Processor.PblkAddress;
sc->cpu_p_blk_len = pobj.Processor.PblkLength;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "acpi_cpu%d: P_BLK at %#x/%d\n",
device_get_unit(dev), sc->cpu_p_blk, sc->cpu_p_blk_len));
acpi_sc = acpi_device_get_parent_softc(dev);
sysctl_ctx_init(&acpi_cpu_sysctl_ctx);
acpi_cpu_sysctl_tree = SYSCTL_ADD_NODE(&acpi_cpu_sysctl_ctx,
SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
OID_AUTO, "cpu", CTLFLAG_RD, 0, "");
/* If this is the first device probed, check for quirks. */
if (device_get_unit(dev) == 0)
acpi_cpu_quirks(sc);
/*
* Probe for throttling and Cx state support.
* If none of these is present, free up unused resources.
*/
thr_ret = acpi_cpu_throttle_probe(sc);
cx_ret = acpi_cpu_cx_probe(sc);
if (thr_ret == 0 || cx_ret == 0) {
status = AcpiInstallNotifyHandler(sc->cpu_handle, ACPI_DEVICE_NOTIFY,
acpi_cpu_notify, sc);
if (device_get_unit(dev) == 0)
AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cpu_startup, NULL);
} else {
sysctl_ctx_free(&acpi_cpu_sysctl_ctx);
}
return_VALUE (0);
}
/*
* 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"));
for (i = 0; i <= mp_maxid; i++) {
if (CPU_ABSENT(i))
continue;
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 int
acpi_cpu_shutdown(device_t dev)
{
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/* Disable any entry to the idle function. */
cpu_cx_count = 0;
/* Wait for all processors to exit acpi_cpu_idle(). */
smp_rendezvous(NULL, NULL, NULL, NULL);
while (cpu_idle_busy > 0)
DELAY(1);
return_VALUE (0);
}
static int
acpi_cpu_throttle_probe(struct acpi_cpu_softc *sc)
{
uint32_t duty_end;
ACPI_BUFFER buf;
ACPI_OBJECT obj;
ACPI_GENERIC_ADDRESS gas;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
/* Get throttling parameters from the FADT. 0 means not supported. */
if (device_get_unit(sc->cpu_dev) == 0) {
cpu_smi_cmd = AcpiGbl_FADT->SmiCmd;
cpu_pstate_cnt = AcpiGbl_FADT->PstateCnt;
cpu_cst_cnt = AcpiGbl_FADT->CstCnt;
cpu_duty_offset = AcpiGbl_FADT->DutyOffset;
cpu_duty_width = AcpiGbl_FADT->DutyWidth;
}
if (cpu_duty_width == 0 || (cpu_quirks & CPU_QUIRK_NO_THROTTLE) != 0)
return (ENXIO);
/* Validate the duty offset/width. */
duty_end = cpu_duty_offset + cpu_duty_width - 1;
if (duty_end > 31) {
device_printf(sc->cpu_dev, "CLK_VAL field overflows P_CNT register\n");
return (ENXIO);
}
if (cpu_duty_offset <= 4 && duty_end >= 4) {
device_printf(sc->cpu_dev, "CLK_VAL field overlaps THT_EN bit\n");
return (ENXIO);
}
/*
* If not present, fall back to using the processor's P_BLK to find
* the P_CNT register.
*
* Note that some systems seem to duplicate the P_BLK pointer
* across multiple CPUs, so not getting the resource is not fatal.
*/
buf.Pointer = &obj;
buf.Length = sizeof(obj);
status = AcpiEvaluateObject(sc->cpu_handle, "_PTC", NULL, &buf);
if (ACPI_SUCCESS(status)) {
if (obj.Buffer.Length < sizeof(ACPI_GENERIC_ADDRESS) + 3) {
device_printf(sc->cpu_dev, "_PTC buffer too small\n");
return (ENXIO);
}
memcpy(&gas, obj.Buffer.Pointer + 3, sizeof(gas));
sc->cpu_p_cnt = acpi_bus_alloc_gas(sc->cpu_dev, &cpu_rid, &gas);
if (sc->cpu_p_cnt != NULL) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "acpi_cpu%d: P_CNT from _PTC\n",
device_get_unit(sc->cpu_dev)));
}
}
/* If _PTC not present or other failure, try the P_BLK. */
if (sc->cpu_p_cnt == NULL) {
/*
* 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 anything >= 4.
*/
if (sc->cpu_p_blk_len < 4)
return (ENXIO);
gas.Address = sc->cpu_p_blk;
gas.AddressSpaceId = ACPI_ADR_SPACE_SYSTEM_IO;
gas.RegisterBitWidth = 32;
sc->cpu_p_cnt = acpi_bus_alloc_gas(sc->cpu_dev, &cpu_rid, &gas);
if (sc->cpu_p_cnt != NULL) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "acpi_cpu%d: P_CNT from P_BLK\n",
device_get_unit(sc->cpu_dev)));
} else {
device_printf(sc->cpu_dev, "Failed to attach throttling P_CNT\n");
return (ENXIO);
}
}
cpu_rid++;
return (0);
}
static int
acpi_cpu_cx_probe(struct acpi_cpu_softc *sc)
{
ACPI_GENERIC_ADDRESS gas;
struct acpi_cx *cx_ptr;
int error;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/* Bus mastering arbitration control is needed for C3. */
if (AcpiGbl_FADT->V1_Pm2CntBlk == 0 || AcpiGbl_FADT->Pm2CntLen == 0) {
cpu_quirks |= CPU_QUIRK_NO_C3;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"acpi_cpu%d: No BM control, C3 disabled\n",
device_get_unit(sc->cpu_dev)));
}
/*
* First, check for the ACPI 2.0 _CST sleep states object.
* If not usable, fall back to the P_BLK's P_LVL2 and P_LVL3.
*/
sc->cpu_cx_count = 0;
error = acpi_cpu_cx_cst(sc);
if (error != 0) {
cx_ptr = sc->cpu_cx_states;
/* C1 has been required since just after ACPI 1.0 */
cx_ptr->type = ACPI_STATE_C1;
cx_ptr->trans_lat = 0;
cpu_non_c3 = 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)
goto done;
/* Validate and allocate resources for C2 (P_LVL2). */
gas.AddressSpaceId = ACPI_ADR_SPACE_SYSTEM_IO;
gas.RegisterBitWidth = 8;
if (AcpiGbl_FADT->Plvl2Lat < 100) {
gas.Address = sc->cpu_p_blk + 4;
cx_ptr->p_lvlx = acpi_bus_alloc_gas(sc->cpu_dev, &cpu_rid, &gas);
if (cx_ptr->p_lvlx != NULL) {
cpu_rid++;
cx_ptr->type = ACPI_STATE_C2;
cx_ptr->trans_lat = AcpiGbl_FADT->Plvl2Lat;
cpu_non_c3 = 1;
cx_ptr++;
sc->cpu_cx_count++;
}
}
if (sc->cpu_p_blk_len < 6)
goto done;
/* Validate and allocate resources for C3 (P_LVL3). */
if (AcpiGbl_FADT->Plvl3Lat < 1000 &&
(cpu_quirks & CPU_QUIRK_NO_C3) == 0) {
gas.Address = sc->cpu_p_blk + 5;
cx_ptr->p_lvlx = acpi_bus_alloc_gas(sc->cpu_dev, &cpu_rid, &gas);
if (cx_ptr->p_lvlx != NULL) {
cpu_rid++;
cx_ptr->type = ACPI_STATE_C3;
cx_ptr->trans_lat = AcpiGbl_FADT->Plvl3Lat;
cx_ptr++;
sc->cpu_cx_count++;
}
}
}
done:
/* If no valid registers were found, don't attach. */
if (sc->cpu_cx_count == 0)
return (ENXIO);
return (0);
}
/*
* 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;
}
/* Set up all valid states. */
sc->cpu_cx_count = 0;
cx_ptr = sc->cpu_cx_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:
cpu_non_c3 = i;
cx_ptr++;
sc->cpu_cx_count++;
continue;
case ACPI_STATE_C2:
if (cx_ptr->trans_lat > 100) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"acpi_cpu%d: C2[%d] not available.\n",
device_get_unit(sc->cpu_dev), i));
continue;
}
cpu_non_c3 = i;
break;
case ACPI_STATE_C3:
default:
if (cx_ptr->trans_lat > 1000 ||
(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, &cpu_rid, &cx_ptr->p_lvlx);
if (cx_ptr->p_lvlx != NULL) {
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);
return (0);
}
/*
* Call this *after* all CPUs have been attached.
*/
static void
acpi_cpu_startup(void *arg)
{
struct acpi_cpu_softc *sc;
int count, i;
/* Get set of CPU devices */
devclass_get_devices(acpi_cpu_devclass, &cpu_devices, &cpu_ndevices);
/*
* Make sure all the processors' Cx counts match. We should probably
* also check the contents of each. However, no known systems have
* non-matching Cx counts so we'll deal with this later.
*/
count = MAX_CX_STATES;
for (i = 0; i < cpu_ndevices; i++) {
sc = device_get_softc(cpu_devices[i]);
count = min(sc->cpu_cx_count, count);
}
cpu_cx_count = count;
/* Perform throttling and Cx final initialization. */
sc = device_get_softc(cpu_devices[0]);
if (sc->cpu_p_cnt != NULL)
acpi_cpu_startup_throttling();
if (cpu_cx_count > 0)
acpi_cpu_startup_cx();
}
/*
* Takes the ACPI lock to avoid fighting anyone over the SMI command
* port.
*/
static void
acpi_cpu_startup_throttling()
{
ACPI_LOCK_DECL;
/* Initialise throttling states */
cpu_throttle_max = CPU_MAX_SPEED;
cpu_throttle_state = CPU_MAX_SPEED;
SYSCTL_ADD_INT(&acpi_cpu_sysctl_ctx,
SYSCTL_CHILDREN(acpi_cpu_sysctl_tree),
OID_AUTO, "throttle_max", CTLFLAG_RD,
&cpu_throttle_max, 0, "maximum CPU speed");
SYSCTL_ADD_PROC(&acpi_cpu_sysctl_ctx,
SYSCTL_CHILDREN(acpi_cpu_sysctl_tree),
OID_AUTO, "throttle_state",
CTLTYPE_INT | CTLFLAG_RW, &cpu_throttle_state,
0, acpi_cpu_throttle_sysctl, "I", "current CPU speed");
/* If ACPI 2.0+, signal platform that we are taking over throttling. */
ACPI_LOCK;
if (cpu_pstate_cnt != 0)
AcpiOsWritePort(cpu_smi_cmd, cpu_pstate_cnt, 8);
/* Set initial speed to maximum. */
acpi_cpu_throttle_set(cpu_throttle_max);
ACPI_UNLOCK;
printf("acpi_cpu: throttling enabled, %d steps (100%% to %d.%d%%), "
"currently %d.%d%%\n", CPU_MAX_SPEED, CPU_SPEED_PRINTABLE(1),
CPU_SPEED_PRINTABLE(cpu_throttle_state));
}
static void
acpi_cpu_startup_cx()
{
struct acpi_cpu_softc *sc;
struct sbuf sb;
int i;
ACPI_LOCK_DECL;
sc = device_get_softc(cpu_devices[0]);
sbuf_new(&sb, cpu_cx_supported, sizeof(cpu_cx_supported), SBUF_FIXEDLEN);
for (i = 0; i < cpu_cx_count; i++) {
sbuf_printf(&sb, "C%d/%d ", sc->cpu_cx_states[i].type,
sc->cpu_cx_states[i].trans_lat);
}
sbuf_trim(&sb);
sbuf_finish(&sb);
SYSCTL_ADD_STRING(&acpi_cpu_sysctl_ctx,
SYSCTL_CHILDREN(acpi_cpu_sysctl_tree),
OID_AUTO, "cx_supported", CTLFLAG_RD, cpu_cx_supported,
0, "Cx/microsecond values for supported Cx states");
SYSCTL_ADD_PROC(&acpi_cpu_sysctl_ctx,
SYSCTL_CHILDREN(acpi_cpu_sysctl_tree),
OID_AUTO, "cx_lowest", CTLTYPE_INT | CTLFLAG_RW,
NULL, 0, acpi_cpu_cx_lowest_sysctl, "I",
"lowest Cx sleep state to use");
SYSCTL_ADD_PROC(&acpi_cpu_sysctl_ctx,
SYSCTL_CHILDREN(acpi_cpu_sysctl_tree),
OID_AUTO, "cx_history", CTLTYPE_STRING | CTLFLAG_RD,
NULL, 0, acpi_cpu_history_sysctl, "A",
"count of full sleeps for Cx state / short sleeps");
#ifdef notyet
/* Signal platform that we can handle _CST notification. */
if (cpu_cst_cnt != 0) {
ACPI_LOCK;
AcpiOsWritePort(cpu_smi_cmd, cpu_cst_cnt, 8);
ACPI_UNLOCK;
}
#endif
/* Take over idling from cpu_idle_default(). */
cpu_cx_next = cpu_cx_lowest;
cpu_idle_hook = acpi_cpu_idle;
}
/*
* Set CPUs to the new state.
*
* Must be called with the ACPI lock held.
*/
static void
acpi_cpu_throttle_set(uint32_t speed)
{
struct acpi_cpu_softc *sc;
int i;
uint32_t p_cnt, clk_val;
ACPI_ASSERTLOCK;
/* Iterate over processors */
for (i = 0; i < cpu_ndevices; i++) {
sc = device_get_softc(cpu_devices[i]);
if (sc->cpu_p_cnt == NULL)
continue;
/* Get the current P_CNT value and disable throttling */
p_cnt = CPU_GET_REG(sc->cpu_p_cnt, 4);
p_cnt &= ~CPU_P_CNT_THT_EN;
CPU_SET_REG(sc->cpu_p_cnt, 4, p_cnt);
/* If we're at maximum speed, that's all */
if (speed < CPU_MAX_SPEED) {
/* Mask the old CLK_VAL off and or-in the new value */
clk_val = (CPU_MAX_SPEED - 1) << cpu_duty_offset;
p_cnt &= ~clk_val;
p_cnt |= (speed << cpu_duty_offset);
/* Write the new P_CNT value and then enable throttling */
CPU_SET_REG(sc->cpu_p_cnt, 4, p_cnt);
p_cnt |= CPU_P_CNT_THT_EN;
CPU_SET_REG(sc->cpu_p_cnt, 4, p_cnt);
}
ACPI_VPRINT(sc->cpu_dev, acpi_device_get_parent_softc(sc->cpu_dev),
"set speed to %d.%d%%\n", CPU_SPEED_PRINTABLE(speed));
}
cpu_throttle_state = speed;
}
/*
* Idle the CPU in the lowest state possible.
* This function is called with interrupts disabled.
*/
static void
acpi_cpu_idle()
{
struct acpi_cpu_softc *sc;
struct acpi_cx *cx_next;
uint32_t start_time, end_time;
int bm_active, i, asleep;
/* If disabled, return immediately. */
if (cpu_cx_count == 0) {
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;
}
/* Record that a CPU is in the idle function. */
atomic_add_int(&cpu_idle_busy, 1);
/*
* 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 enabled.
*/
AcpiGetRegister(ACPI_BITREG_BUS_MASTER_STATUS, &bm_active,
ACPI_MTX_DO_NOT_LOCK);
if (bm_active != 0) {
AcpiSetRegister(ACPI_BITREG_BUS_MASTER_STATUS, 1,
ACPI_MTX_DO_NOT_LOCK);
cpu_cx_next = min(cpu_cx_next, cpu_non_c3);
}
/* Perform the actual sleep based on the Cx-specific semantics. */
cx_next = &sc->cpu_cx_states[cpu_cx_next];
switch (cx_next->type) {
case ACPI_STATE_C0:
panic("acpi_cpu_idle: attempting to sleep in C0");
/* NOTREACHED */
case ACPI_STATE_C1:
/* Execute HLT (or equivalent) and wait for an interrupt. */
acpi_cpu_c1();
/*
* We can't calculate the time spent in C1 since the place we
* wake up is an ISR. Use a constant time of 1 ms.
*/
start_time = 0;
end_time = 1000;
break;
case ACPI_STATE_C2:
/*
* 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.
*/
AcpiHwLowLevelRead(32, &start_time, &AcpiGbl_FADT->XPmTmrBlk);
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.
*/
AcpiHwLowLevelRead(32, &end_time, &AcpiGbl_FADT->XPmTmrBlk);
AcpiHwLowLevelRead(32, &end_time, &AcpiGbl_FADT->XPmTmrBlk);
ACPI_ENABLE_IRQS();
break;
case ACPI_STATE_C3:
default:
/* Disable bus master arbitration and enable bus master wakeup. */
AcpiSetRegister(ACPI_BITREG_ARB_DISABLE, 1, ACPI_MTX_DO_NOT_LOCK);
AcpiSetRegister(ACPI_BITREG_BUS_MASTER_RLD, 1, ACPI_MTX_DO_NOT_LOCK);
/* Read from P_LVLx to enter C3, checking time spent asleep. */
AcpiHwLowLevelRead(32, &start_time, &AcpiGbl_FADT->XPmTmrBlk);
CPU_GET_REG(cx_next->p_lvlx, 1);
/* Read the end time twice. See comment for C2 above. */
AcpiHwLowLevelRead(32, &end_time, &AcpiGbl_FADT->XPmTmrBlk);
AcpiHwLowLevelRead(32, &end_time, &AcpiGbl_FADT->XPmTmrBlk);
/* Enable bus master arbitration and disable bus master wakeup. */
AcpiSetRegister(ACPI_BITREG_ARB_DISABLE, 0, ACPI_MTX_DO_NOT_LOCK);
AcpiSetRegister(ACPI_BITREG_BUS_MASTER_RLD, 0, ACPI_MTX_DO_NOT_LOCK);
ACPI_ENABLE_IRQS();
break;
}
/* Find the actual time asleep in microseconds, minus overhead. */
acpi_pm_ticksub(&end_time, &start_time);
asleep = PM_USEC(end_time) - cx_next->trans_lat;
/* Record statistics */
if (asleep < cx_next->trans_lat)
cpu_cx_stats[cpu_cx_next].short_slp++;
else
cpu_cx_stats[cpu_cx_next].long_slp++;
/*
* If we slept 100 us or more, use the lowest Cx state.
* Otherwise, find the lowest state that has a latency less than
* or equal to the length of our last sleep.
*/
if (asleep >= 100)
cpu_cx_next = cpu_cx_lowest;
else {
for (i = cpu_cx_lowest; i >= 0; i--) {
if (sc->cpu_cx_states[i].trans_lat <= asleep) {
cpu_cx_next = i;
break;
}
}
}
/* Decrement reference count checked by acpi_cpu_shutdown(). */
atomic_subtract_int(&cpu_idle_busy, 1);
}
/* Put the CPU in C1 in a machine-dependant way. */
static void
acpi_cpu_c1()
{
#ifdef __ia64__
ia64_call_pal_static(PAL_HALT_LIGHT, 0, 0, 0);
#else
__asm __volatile("sti; hlt");
#endif
}
/* Find the difference between two PM tick counts. */
static void
acpi_pm_ticksub(uint32_t *end, const uint32_t *start)
{
if (*end >= *start)
*end = *end - *start;
else if (AcpiGbl_FADT->TmrValExt == 0)
*end = (((0x00FFFFFF - *start) + *end + 1) & 0x00FFFFFF);
else
*end = ((0xFFFFFFFF - *start) + *end + 1);
}
/*
* Re-evaluate the _PSS and _CST objects when we are notified that they
* have 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;
switch (notify) {
case ACPI_CPU_NOTIFY_PERF_STATES:
device_printf(sc->cpu_dev, "Performance states changed\n");
/* acpi_cpu_px_available(sc); */
break;
case ACPI_CPU_NOTIFY_CX_STATES:
device_printf(sc->cpu_dev, "Cx states changed\n");
/* acpi_cpu_cx_cst(sc); */
break;
default:
device_printf(sc->cpu_dev, "Unknown notify %#x\n", notify);
break;
}
}
static int
acpi_cpu_quirks(struct acpi_cpu_softc *sc)
{
/*
* C3 is not supported on multiple CPUs since this would require
* flushing all caches which is currently too expensive.
*/
if (mp_ncpus > 1)
cpu_quirks |= CPU_QUIRK_NO_C3;
#ifdef notyet
/* 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 throttling control on PIIX4 A and B-step.
* See specification changes #13 ("Manual Throttle Duty Cycle")
* and #14 ("Enabling and Disabling Manual Throttle"), plus
* erratum #5 ("STPCLK# Deassertion Time") from the January
* 2002 PIIX4 specification update. Note that few (if any)
* mobile systems ever used this part.
*/
case PCI_REVISION_A_STEP:
case PCI_REVISION_B_STEP:
cpu_quirks |= CPU_QUIRK_NO_THROTTLE;
/* FALLTHROUGH */
/*
* 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.
*/
case PCI_REVISION_4E:
case PCI_REVISION_4M:
cpu_quirks |= CPU_QUIRK_NO_C3;
break;
default:
break;
}
}
#endif
return (0);
}
/* Handle changes in the CPU throttling setting. */
static int
acpi_cpu_throttle_sysctl(SYSCTL_HANDLER_ARGS)
{
uint32_t *argp;
uint32_t arg;
int error;
ACPI_LOCK_DECL;
argp = (uint32_t *)oidp->oid_arg1;
arg = *argp;
error = sysctl_handle_int(oidp, &arg, 0, req);
/* Error or no new value */
if (error != 0 || req->newptr == NULL)
return (error);
if (arg < 1 || arg > cpu_throttle_max)
return (EINVAL);
/* If throttling changed, notify the BIOS of the new rate. */
ACPI_LOCK;
if (*argp != arg) {
*argp = arg;
acpi_cpu_throttle_set(arg);
}
ACPI_UNLOCK;
return (0);
}
static int
acpi_cpu_history_sysctl(SYSCTL_HANDLER_ARGS)
{
struct sbuf sb;
char buf[128];
int i;
sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
for (i = 0; i < cpu_cx_count; i++) {
sbuf_printf(&sb, "%u/%u ", cpu_cx_stats[i].long_slp,
cpu_cx_stats[i].short_slp);
}
sbuf_trim(&sb);
sbuf_finish(&sb);
sysctl_handle_string(oidp, sbuf_data(&sb), 0, req);
return (0);
}
static int
acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS)
{
struct acpi_cpu_softc *sc;
int val, error, i;
sc = device_get_softc(cpu_devices[0]);
val = cpu_cx_lowest;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
if (val < 0 || val > cpu_cx_count - 1)
return (EINVAL);
/* Use the new value for the next idle slice. */
cpu_cx_lowest = val;
cpu_cx_next = val;
/* If not disabling, cache the new lowest non-C3 state. */
cpu_non_c3 = 0;
for (i = cpu_cx_lowest; i >= 0; i--) {
if (sc->cpu_cx_states[i].type < ACPI_STATE_C3) {
cpu_non_c3 = i;
break;
}
}
/* Reset the statistics counters. */
memset(cpu_cx_stats, 0, sizeof(cpu_cx_stats));
return (0);
}
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