xref: /dflybsd-src/sys/dev/acpica/acpi_cpu_cstate.c (revision 41e658a282f0bb896763169a7b4af97ff48a5b56)
15db2f26eSSascha Wildner /*-
25db2f26eSSascha Wildner  * Copyright (c) 2003-2005 Nate Lawson (SDG)
35db2f26eSSascha Wildner  * Copyright (c) 2001 Michael Smith
45db2f26eSSascha Wildner  * All rights reserved.
55db2f26eSSascha Wildner  *
65db2f26eSSascha Wildner  * Redistribution and use in source and binary forms, with or without
75db2f26eSSascha Wildner  * modification, are permitted provided that the following conditions
85db2f26eSSascha Wildner  * are met:
95db2f26eSSascha Wildner  * 1. Redistributions of source code must retain the above copyright
105db2f26eSSascha Wildner  *    notice, this list of conditions and the following disclaimer.
115db2f26eSSascha Wildner  * 2. Redistributions in binary form must reproduce the above copyright
125db2f26eSSascha Wildner  *    notice, this list of conditions and the following disclaimer in the
135db2f26eSSascha Wildner  *    documentation and/or other materials provided with the distribution.
145db2f26eSSascha Wildner  *
155db2f26eSSascha Wildner  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
165db2f26eSSascha Wildner  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
175db2f26eSSascha Wildner  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
185db2f26eSSascha Wildner  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
195db2f26eSSascha Wildner  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
205db2f26eSSascha Wildner  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
215db2f26eSSascha Wildner  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
225db2f26eSSascha Wildner  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
235db2f26eSSascha Wildner  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
245db2f26eSSascha Wildner  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
255db2f26eSSascha Wildner  * SUCH DAMAGE.
265db2f26eSSascha Wildner  *
275db2f26eSSascha Wildner  * $FreeBSD: src/sys/dev/acpica/acpi_cpu.c,v 1.72 2008/04/12 12:06:00 rpaulo Exp $
285db2f26eSSascha Wildner  */
295db2f26eSSascha Wildner 
305db2f26eSSascha Wildner #include "opt_acpi.h"
315db2f26eSSascha Wildner #include <sys/param.h>
325db2f26eSSascha Wildner #include <sys/bus.h>
335db2f26eSSascha Wildner #include <sys/kernel.h>
345db2f26eSSascha Wildner #include <sys/malloc.h>
355db2f26eSSascha Wildner #include <sys/globaldata.h>
365db2f26eSSascha Wildner #include <sys/power.h>
375db2f26eSSascha Wildner #include <sys/proc.h>
385db2f26eSSascha Wildner #include <sys/sbuf.h>
395db2f26eSSascha Wildner #include <sys/thread2.h>
40b45624acSSepherosa Ziehau #include <sys/serialize.h>
41c241507cSSepherosa Ziehau #include <sys/msgport2.h>
425db2f26eSSascha Wildner 
435db2f26eSSascha Wildner #include <bus/pci/pcivar.h>
445db2f26eSSascha Wildner #include <machine/atomic.h>
455db2f26eSSascha Wildner #include <machine/globaldata.h>
465db2f26eSSascha Wildner #include <machine/md_var.h>
475db2f26eSSascha Wildner #include <machine/smp.h>
485db2f26eSSascha Wildner #include <sys/rman.h>
495db2f26eSSascha Wildner 
50c241507cSSepherosa Ziehau #include <net/netisr2.h>
51c241507cSSepherosa Ziehau #include <net/netmsg2.h>
52c241507cSSepherosa Ziehau #include <net/if_var.h>
53c241507cSSepherosa Ziehau 
545db2f26eSSascha Wildner #include "acpi.h"
555db2f26eSSascha Wildner #include "acpivar.h"
565db2f26eSSascha Wildner #include "acpi_cpu.h"
575db2f26eSSascha Wildner 
585db2f26eSSascha Wildner /*
595db2f26eSSascha Wildner  * Support for ACPI Processor devices, including C[1-3] sleep states.
605db2f26eSSascha Wildner  */
615db2f26eSSascha Wildner 
625db2f26eSSascha Wildner /* Hooks for the ACPI CA debugging infrastructure */
635db2f26eSSascha Wildner #define _COMPONENT	ACPI_PROCESSOR
645db2f26eSSascha Wildner ACPI_MODULE_NAME("PROCESSOR")
655db2f26eSSascha Wildner 
66c241507cSSepherosa Ziehau struct netmsg_acpi_cst {
67c241507cSSepherosa Ziehau 	struct netmsg_base base;
684eee58faSSepherosa Ziehau 	struct acpi_cst_softc *sc;
69c241507cSSepherosa Ziehau 	int		val;
70c241507cSSepherosa Ziehau };
71c241507cSSepherosa Ziehau 
725db2f26eSSascha Wildner struct acpi_cx {
735db2f26eSSascha Wildner     struct resource	*p_lvlx;	/* Register to read to enter state. */
745db2f26eSSascha Wildner     int			 rid;		/* rid of p_lvlx */
755db2f26eSSascha Wildner     uint32_t		 type;		/* C1-3 (C4 and up treated as C3). */
765db2f26eSSascha Wildner     uint32_t		 trans_lat;	/* Transition latency (usec). */
775db2f26eSSascha Wildner     uint32_t		 power;		/* Power consumed (mW). */
785db2f26eSSascha Wildner     int			 res_type;	/* Resource type for p_lvlx. */
795db2f26eSSascha Wildner };
805db2f26eSSascha Wildner #define MAX_CX_STATES	 8
815db2f26eSSascha Wildner 
824eee58faSSepherosa Ziehau struct acpi_cst_softc {
834eee58faSSepherosa Ziehau     device_t		 cst_dev;
844eee58faSSepherosa Ziehau     struct acpi_cpux_softc *cst_parent;
854eee58faSSepherosa Ziehau     ACPI_HANDLE		 cst_handle;
864eee58faSSepherosa Ziehau     int			 cst_cpuid;
8744806d43SSepherosa Ziehau     uint32_t		 cst_flags;	/* ACPI_CST_FLAG_ */
884eee58faSSepherosa Ziehau     uint32_t		 cst_p_blk;	/* ACPI P_BLK location */
894eee58faSSepherosa Ziehau     uint32_t		 cst_p_blk_len;	/* P_BLK length (must be 6). */
904eee58faSSepherosa Ziehau     struct acpi_cx	 cst_cx_states[MAX_CX_STATES];
914eee58faSSepherosa Ziehau     int			 cst_cx_count;	/* Number of valid Cx states. */
924eee58faSSepherosa Ziehau     int			 cst_prev_sleep;/* Last idle sleep duration. */
935db2f26eSSascha Wildner     /* Runtime state. */
944eee58faSSepherosa Ziehau     int			 cst_non_c3;	/* Index of lowest non-C3 state. */
954eee58faSSepherosa Ziehau     u_long		 cst_cx_stats[MAX_CX_STATES];/* Cx usage history. */
965db2f26eSSascha Wildner     /* Values for sysctl. */
974eee58faSSepherosa Ziehau     int			 cst_cx_lowest; /* Current Cx lowest */
984eee58faSSepherosa Ziehau     int			 cst_cx_lowest_req; /* Requested Cx lowest */
994eee58faSSepherosa Ziehau     char 		 cst_cx_supported[64];
1005db2f26eSSascha Wildner };
1015db2f26eSSascha Wildner 
10244806d43SSepherosa Ziehau #define ACPI_CST_FLAG_PROBING	0x1
10344806d43SSepherosa Ziehau 
1045db2f26eSSascha Wildner #define CPU_GET_REG(reg, width) 					\
1055db2f26eSSascha Wildner     (bus_space_read_ ## width(rman_get_bustag((reg)), 			\
1065db2f26eSSascha Wildner 		      rman_get_bushandle((reg)), 0))
1075db2f26eSSascha Wildner 
1085db2f26eSSascha Wildner #define PM_USEC(x)	 ((x) >> 2)	/* ~4 clocks per usec (3.57955 Mhz) */
1095db2f26eSSascha Wildner 
1105db2f26eSSascha Wildner #define CPU_QUIRK_NO_C3		(1<<0)	/* C3-type states are not usable. */
1115db2f26eSSascha Wildner #define CPU_QUIRK_NO_BM_CTRL	(1<<2)	/* No bus mastering control. */
1125db2f26eSSascha Wildner 
1135db2f26eSSascha Wildner #define PCI_VENDOR_INTEL	0x8086
1145db2f26eSSascha Wildner #define PCI_DEVICE_82371AB_3	0x7113	/* PIIX4 chipset for quirks. */
1155db2f26eSSascha Wildner #define PCI_REVISION_A_STEP	0
1165db2f26eSSascha Wildner #define PCI_REVISION_B_STEP	1
1175db2f26eSSascha Wildner #define PCI_REVISION_4E		2
1185db2f26eSSascha Wildner #define PCI_REVISION_4M		3
1195db2f26eSSascha Wildner #define PIIX4_DEVACTB_REG	0x58
1205db2f26eSSascha Wildner #define PIIX4_BRLD_EN_IRQ0	(1<<0)
1215db2f26eSSascha Wildner #define PIIX4_BRLD_EN_IRQ	(1<<1)
1225db2f26eSSascha Wildner #define PIIX4_BRLD_EN_IRQ8	(1<<5)
1235db2f26eSSascha Wildner #define PIIX4_STOP_BREAK_MASK	(PIIX4_BRLD_EN_IRQ0 | PIIX4_BRLD_EN_IRQ | PIIX4_BRLD_EN_IRQ8)
1245db2f26eSSascha Wildner #define PIIX4_PCNTRL_BST_EN	(1<<10)
1255db2f26eSSascha Wildner 
1265db2f26eSSascha Wildner /* Platform hardware resource information. */
1275db2f26eSSascha Wildner static uint32_t		 cpu_smi_cmd;	/* Value to write to SMI_CMD. */
1285db2f26eSSascha Wildner static uint8_t		 cpu_cst_cnt;	/* Indicate we are _CST aware. */
1295db2f26eSSascha Wildner static int		 cpu_quirks;	/* Indicate any hardware bugs. */
1305db2f26eSSascha Wildner 
1315db2f26eSSascha Wildner /* Runtime state. */
1325db2f26eSSascha Wildner static int		 cpu_disable_idle; /* Disable entry to idle function */
1335db2f26eSSascha Wildner static int		 cpu_cx_count;	/* Number of valid Cx states */
1345db2f26eSSascha Wildner 
1355db2f26eSSascha Wildner /* Values for sysctl. */
1365db2f26eSSascha Wildner static int		 cpu_cx_generic;
1371d730338SSepherosa Ziehau static int		 cpu_cx_lowest; /* Current Cx lowest */
1381d730338SSepherosa Ziehau static int		 cpu_cx_lowest_req; /* Requested Cx lowest */
139b45624acSSepherosa Ziehau static struct lwkt_serialize cpu_cx_slize = LWKT_SERIALIZE_INITIALIZER;
1405db2f26eSSascha Wildner 
1415db2f26eSSascha Wildner /* C3 state transition */
1425db2f26eSSascha Wildner static int		 cpu_c3_ncpus;
1435db2f26eSSascha Wildner 
1445db2f26eSSascha Wildner static device_t		*cpu_devices;
1455db2f26eSSascha Wildner static int		 cpu_ndevices;
1464eee58faSSepherosa Ziehau static struct acpi_cst_softc **cpu_softc;
1475db2f26eSSascha Wildner 
14892c9201cSSepherosa Ziehau static int	acpi_cst_probe(device_t dev);
14992c9201cSSepherosa Ziehau static int	acpi_cst_attach(device_t dev);
15092c9201cSSepherosa Ziehau static int	acpi_cst_suspend(device_t dev);
15192c9201cSSepherosa Ziehau static int	acpi_cst_resume(device_t dev);
15292c9201cSSepherosa Ziehau static int	acpi_cst_shutdown(device_t dev);
153ac13872aSSepherosa Ziehau 
1544eee58faSSepherosa Ziehau static void	acpi_cpu_cx_probe(struct acpi_cst_softc *sc);
1554eee58faSSepherosa Ziehau static void	acpi_cpu_generic_cx_probe(struct acpi_cst_softc *sc);
1564eee58faSSepherosa Ziehau static int	acpi_cpu_cx_cst(struct acpi_cst_softc *sc);
1574eee58faSSepherosa Ziehau static int	acpi_cpu_cx_cst_dispatch(struct acpi_cst_softc *sc);
1585db2f26eSSascha Wildner static void	acpi_cpu_startup(void *arg);
1594eee58faSSepherosa Ziehau static void	acpi_cpu_startup_cx(struct acpi_cst_softc *sc);
1604eee58faSSepherosa Ziehau static void	acpi_cpu_cx_list(struct acpi_cst_softc *sc);
1615db2f26eSSascha Wildner static void	acpi_cpu_idle(void);
1625db2f26eSSascha Wildner static void	acpi_cpu_cst_notify(device_t);
1635db2f26eSSascha Wildner static int	acpi_cpu_quirks(void);
1645db2f26eSSascha Wildner static int	acpi_cpu_usage_sysctl(SYSCTL_HANDLER_ARGS);
1654eee58faSSepherosa Ziehau static int	acpi_cpu_set_cx_lowest(struct acpi_cst_softc *, int);
1664eee58faSSepherosa Ziehau static int	acpi_cpu_set_cx_lowest_oncpu(struct acpi_cst_softc *, int);
1675db2f26eSSascha Wildner static int	acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS);
1681d730338SSepherosa Ziehau static int	acpi_cpu_cx_lowest_use_sysctl(SYSCTL_HANDLER_ARGS);
1695db2f26eSSascha Wildner static int	acpi_cpu_global_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS);
1701d730338SSepherosa Ziehau static int	acpi_cpu_global_cx_lowest_use_sysctl(SYSCTL_HANDLER_ARGS);
1714eee58faSSepherosa Ziehau static void	acpi_cpu_cx_non_c3(struct acpi_cst_softc *sc);
1724cf48621SSepherosa Ziehau static void	acpi_cpu_global_cx_count(void);
1735db2f26eSSascha Wildner 
1745db2f26eSSascha Wildner static void	acpi_cpu_c1(void);	/* XXX */
1755db2f26eSSascha Wildner 
176*41e658a2SSepherosa Ziehau static device_method_t acpi_cst_methods[] = {
1775db2f26eSSascha Wildner     /* Device interface */
17892c9201cSSepherosa Ziehau     DEVMETHOD(device_probe,	acpi_cst_probe),
17992c9201cSSepherosa Ziehau     DEVMETHOD(device_attach,	acpi_cst_attach),
1805db2f26eSSascha Wildner     DEVMETHOD(device_detach,	bus_generic_detach),
18192c9201cSSepherosa Ziehau     DEVMETHOD(device_shutdown,	acpi_cst_shutdown),
18292c9201cSSepherosa Ziehau     DEVMETHOD(device_suspend,	acpi_cst_suspend),
18392c9201cSSepherosa Ziehau     DEVMETHOD(device_resume,	acpi_cst_resume),
1845db2f26eSSascha Wildner 
1855db2f26eSSascha Wildner     /* Bus interface */
186ac13872aSSepherosa Ziehau     DEVMETHOD(bus_add_child,	bus_generic_add_child),
187ac13872aSSepherosa Ziehau     DEVMETHOD(bus_read_ivar,	bus_generic_read_ivar),
188ac13872aSSepherosa Ziehau     DEVMETHOD(bus_get_resource_list, bus_generic_get_resource_list),
1895db2f26eSSascha Wildner     DEVMETHOD(bus_get_resource,	bus_generic_rl_get_resource),
1905db2f26eSSascha Wildner     DEVMETHOD(bus_set_resource,	bus_generic_rl_set_resource),
1915db2f26eSSascha Wildner     DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
1925db2f26eSSascha Wildner     DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
1935db2f26eSSascha Wildner     DEVMETHOD(bus_driver_added,	bus_generic_driver_added),
1945db2f26eSSascha Wildner     DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
1955db2f26eSSascha Wildner     DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
1965db2f26eSSascha Wildner     DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
1975db2f26eSSascha Wildner     DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
198d3c9c58eSSascha Wildner     DEVMETHOD_END
1995db2f26eSSascha Wildner };
2005db2f26eSSascha Wildner 
201*41e658a2SSepherosa Ziehau static driver_t acpi_cst_driver = {
2025db2f26eSSascha Wildner     "cpu_cst",
203*41e658a2SSepherosa Ziehau     acpi_cst_methods,
2044eee58faSSepherosa Ziehau     sizeof(struct acpi_cst_softc),
2055db2f26eSSascha Wildner };
2065db2f26eSSascha Wildner 
207*41e658a2SSepherosa Ziehau static devclass_t acpi_cst_devclass;
208*41e658a2SSepherosa Ziehau DRIVER_MODULE(cpu_cst, cpu, acpi_cst_driver, acpi_cst_devclass, NULL, NULL);
2095db2f26eSSascha Wildner MODULE_DEPEND(cpu_cst, acpi, 1, 1, 1);
2105db2f26eSSascha Wildner 
2115db2f26eSSascha Wildner static int
21292c9201cSSepherosa Ziehau acpi_cst_probe(device_t dev)
2135db2f26eSSascha Wildner {
2145db2f26eSSascha Wildner     int cpu_id;
2155db2f26eSSascha Wildner 
2165db2f26eSSascha Wildner     if (acpi_disabled("cpu_cst") || acpi_get_type(dev) != ACPI_TYPE_PROCESSOR)
2175db2f26eSSascha Wildner 	return (ENXIO);
2185db2f26eSSascha Wildner 
2195db2f26eSSascha Wildner     cpu_id = acpi_get_magic(dev);
2205db2f26eSSascha Wildner 
2215db2f26eSSascha Wildner     if (cpu_softc == NULL)
2224eee58faSSepherosa Ziehau 	cpu_softc = kmalloc(sizeof(struct acpi_cst_softc *) *
2235db2f26eSSascha Wildner 	    SMP_MAXCPU, M_TEMP /* XXX */, M_INTWAIT | M_ZERO);
2245db2f26eSSascha Wildner 
2255db2f26eSSascha Wildner     /*
2265db2f26eSSascha Wildner      * Check if we already probed this processor.  We scan the bus twice
2275db2f26eSSascha Wildner      * so it's possible we've already seen this one.
2285db2f26eSSascha Wildner      */
2295db2f26eSSascha Wildner     if (cpu_softc[cpu_id] != NULL) {
2305db2f26eSSascha Wildner 	device_printf(dev, "CPU%d cstate already exist\n", cpu_id);
2315db2f26eSSascha Wildner 	return (ENXIO);
2325db2f26eSSascha Wildner     }
2335db2f26eSSascha Wildner 
2345db2f26eSSascha Wildner     /* Mark this processor as in-use and save our derived id for attach. */
2355db2f26eSSascha Wildner     cpu_softc[cpu_id] = (void *)1;
2365db2f26eSSascha Wildner     device_set_desc(dev, "ACPI CPU C-State");
2375db2f26eSSascha Wildner 
2385db2f26eSSascha Wildner     return (0);
2395db2f26eSSascha Wildner }
2405db2f26eSSascha Wildner 
2415db2f26eSSascha Wildner static int
24292c9201cSSepherosa Ziehau acpi_cst_attach(device_t dev)
2435db2f26eSSascha Wildner {
2445db2f26eSSascha Wildner     ACPI_BUFFER		   buf;
2455db2f26eSSascha Wildner     ACPI_OBJECT		   *obj;
2464eee58faSSepherosa Ziehau     struct acpi_cst_softc *sc;
2475db2f26eSSascha Wildner     ACPI_STATUS		   status;
2485db2f26eSSascha Wildner 
2495db2f26eSSascha Wildner     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
2505db2f26eSSascha Wildner 
2515db2f26eSSascha Wildner     sc = device_get_softc(dev);
2524eee58faSSepherosa Ziehau     sc->cst_dev = dev;
2534eee58faSSepherosa Ziehau     sc->cst_parent = device_get_softc(device_get_parent(dev));
2544eee58faSSepherosa Ziehau     sc->cst_handle = acpi_get_handle(dev);
2554eee58faSSepherosa Ziehau     sc->cst_cpuid = acpi_get_magic(dev);
2564eee58faSSepherosa Ziehau     cpu_softc[sc->cst_cpuid] = sc;
2575db2f26eSSascha Wildner     cpu_smi_cmd = AcpiGbl_FADT.SmiCommand;
2585db2f26eSSascha Wildner     cpu_cst_cnt = AcpiGbl_FADT.CstControl;
2595db2f26eSSascha Wildner 
2605db2f26eSSascha Wildner     buf.Pointer = NULL;
2615db2f26eSSascha Wildner     buf.Length = ACPI_ALLOCATE_BUFFER;
2624eee58faSSepherosa Ziehau     status = AcpiEvaluateObject(sc->cst_handle, NULL, NULL, &buf);
2635db2f26eSSascha Wildner     if (ACPI_FAILURE(status)) {
2645db2f26eSSascha Wildner 	device_printf(dev, "attach failed to get Processor obj - %s\n",
2655db2f26eSSascha Wildner 		      AcpiFormatException(status));
2665db2f26eSSascha Wildner 	return (ENXIO);
2675db2f26eSSascha Wildner     }
2685db2f26eSSascha Wildner     obj = (ACPI_OBJECT *)buf.Pointer;
2694eee58faSSepherosa Ziehau     sc->cst_p_blk = obj->Processor.PblkAddress;
2704eee58faSSepherosa Ziehau     sc->cst_p_blk_len = obj->Processor.PblkLength;
2715db2f26eSSascha Wildner     AcpiOsFree(obj);
2725db2f26eSSascha Wildner     ACPI_DEBUG_PRINT((ACPI_DB_INFO, "acpi_cpu%d: P_BLK at %#x/%d\n",
2734eee58faSSepherosa Ziehau 		     device_get_unit(dev), sc->cst_p_blk, sc->cst_p_blk_len));
2745db2f26eSSascha Wildner 
2755db2f26eSSascha Wildner     /*
2765db2f26eSSascha Wildner      * If this is the first cpu we attach, create and initialize the generic
2775db2f26eSSascha Wildner      * resources that will be used by all acpi cpu devices.
2785db2f26eSSascha Wildner      */
2795db2f26eSSascha Wildner     if (device_get_unit(dev) == 0) {
2805db2f26eSSascha Wildner 	/* Assume we won't be using generic Cx mode by default */
2815db2f26eSSascha Wildner 	cpu_cx_generic = FALSE;
2825db2f26eSSascha Wildner 
2835db2f26eSSascha Wildner 	/* Queue post cpu-probing task handler */
2845db2f26eSSascha Wildner 	AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cpu_startup, NULL);
2855db2f26eSSascha Wildner     }
2865db2f26eSSascha Wildner 
2875db2f26eSSascha Wildner     /* Probe for Cx state support. */
2885db2f26eSSascha Wildner     acpi_cpu_cx_probe(sc);
2895db2f26eSSascha Wildner 
2905db2f26eSSascha Wildner     /* Finally,  call identify and probe/attach for child devices. */
2915db2f26eSSascha Wildner     bus_generic_probe(dev);
2925db2f26eSSascha Wildner     bus_generic_attach(dev);
2935db2f26eSSascha Wildner 
2945db2f26eSSascha Wildner     return (0);
2955db2f26eSSascha Wildner }
2965db2f26eSSascha Wildner 
2975db2f26eSSascha Wildner /*
2985db2f26eSSascha Wildner  * Disable any entry to the idle function during suspend and re-enable it
2995db2f26eSSascha Wildner  * during resume.
3005db2f26eSSascha Wildner  */
3015db2f26eSSascha Wildner static int
30292c9201cSSepherosa Ziehau acpi_cst_suspend(device_t dev)
3035db2f26eSSascha Wildner {
3045db2f26eSSascha Wildner     int error;
3055db2f26eSSascha Wildner 
3065db2f26eSSascha Wildner     error = bus_generic_suspend(dev);
3075db2f26eSSascha Wildner     if (error)
3085db2f26eSSascha Wildner 	return (error);
3095db2f26eSSascha Wildner     cpu_disable_idle = TRUE;
3105db2f26eSSascha Wildner     return (0);
3115db2f26eSSascha Wildner }
3125db2f26eSSascha Wildner 
3135db2f26eSSascha Wildner static int
31492c9201cSSepherosa Ziehau acpi_cst_resume(device_t dev)
3155db2f26eSSascha Wildner {
3165db2f26eSSascha Wildner 
3175db2f26eSSascha Wildner     cpu_disable_idle = FALSE;
3185db2f26eSSascha Wildner     return (bus_generic_resume(dev));
3195db2f26eSSascha Wildner }
3205db2f26eSSascha Wildner 
3215db2f26eSSascha Wildner static int
32292c9201cSSepherosa Ziehau acpi_cst_shutdown(device_t dev)
3235db2f26eSSascha Wildner {
3245db2f26eSSascha Wildner     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
3255db2f26eSSascha Wildner 
3265db2f26eSSascha Wildner     /* Allow children to shutdown first. */
3275db2f26eSSascha Wildner     bus_generic_shutdown(dev);
3285db2f26eSSascha Wildner 
3295db2f26eSSascha Wildner     /*
3305db2f26eSSascha Wildner      * Disable any entry to the idle function.  There is a small race where
3315db2f26eSSascha Wildner      * an idle thread have passed this check but not gone to sleep.  This
3325db2f26eSSascha Wildner      * is ok since device_shutdown() does not free the softc, otherwise
3335db2f26eSSascha Wildner      * we'd have to be sure all threads were evicted before returning.
3345db2f26eSSascha Wildner      */
3355db2f26eSSascha Wildner     cpu_disable_idle = TRUE;
3365db2f26eSSascha Wildner 
3375db2f26eSSascha Wildner     return_VALUE (0);
3385db2f26eSSascha Wildner }
3395db2f26eSSascha Wildner 
3405db2f26eSSascha Wildner static void
3414eee58faSSepherosa Ziehau acpi_cpu_cx_probe(struct acpi_cst_softc *sc)
3425db2f26eSSascha Wildner {
3435db2f26eSSascha Wildner     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
3445db2f26eSSascha Wildner 
3455db2f26eSSascha Wildner     /* Use initial sleep value of 1 sec. to start with lowest idle state. */
3464eee58faSSepherosa Ziehau     sc->cst_prev_sleep = 1000000;
3474eee58faSSepherosa Ziehau     sc->cst_cx_lowest = 0;
3484eee58faSSepherosa Ziehau     sc->cst_cx_lowest_req = 0;
3495db2f26eSSascha Wildner 
3505db2f26eSSascha Wildner     /*
3515db2f26eSSascha Wildner      * Check for the ACPI 2.0 _CST sleep states object. If we can't find
3525db2f26eSSascha Wildner      * any, we'll revert to generic FADT/P_BLK Cx control method which will
3535db2f26eSSascha Wildner      * be handled by acpi_cpu_startup. We need to defer to after having
3545db2f26eSSascha Wildner      * probed all the cpus in the system before probing for generic Cx
3555db2f26eSSascha Wildner      * states as we may already have found cpus with valid _CST packages
3565db2f26eSSascha Wildner      */
3575db2f26eSSascha Wildner     if (!cpu_cx_generic && acpi_cpu_cx_cst(sc) != 0) {
3585db2f26eSSascha Wildner 	/*
3595db2f26eSSascha Wildner 	 * We were unable to find a _CST package for this cpu or there
3605db2f26eSSascha Wildner 	 * was an error parsing it. Switch back to generic mode.
3615db2f26eSSascha Wildner 	 */
3625db2f26eSSascha Wildner 	cpu_cx_generic = TRUE;
3635db2f26eSSascha Wildner 	if (bootverbose)
3644eee58faSSepherosa Ziehau 	    device_printf(sc->cst_dev, "switching to generic Cx mode\n");
3655db2f26eSSascha Wildner     }
3665db2f26eSSascha Wildner 
3675db2f26eSSascha Wildner     /*
3685db2f26eSSascha Wildner      * TODO: _CSD Package should be checked here.
3695db2f26eSSascha Wildner      */
3705db2f26eSSascha Wildner }
3715db2f26eSSascha Wildner 
3725db2f26eSSascha Wildner static void
3734eee58faSSepherosa Ziehau acpi_cpu_generic_cx_probe(struct acpi_cst_softc *sc)
3745db2f26eSSascha Wildner {
3755db2f26eSSascha Wildner     ACPI_GENERIC_ADDRESS	 gas;
3765db2f26eSSascha Wildner     struct acpi_cx		*cx_ptr;
3775db2f26eSSascha Wildner 
3784eee58faSSepherosa Ziehau     sc->cst_cx_count = 0;
3794eee58faSSepherosa Ziehau     cx_ptr = sc->cst_cx_states;
3805db2f26eSSascha Wildner 
3815db2f26eSSascha Wildner     /* Use initial sleep value of 1 sec. to start with lowest idle state. */
3824eee58faSSepherosa Ziehau     sc->cst_prev_sleep = 1000000;
3835db2f26eSSascha Wildner 
3845db2f26eSSascha Wildner     /* C1 has been required since just after ACPI 1.0 */
3855db2f26eSSascha Wildner     cx_ptr->type = ACPI_STATE_C1;
3865db2f26eSSascha Wildner     cx_ptr->trans_lat = 0;
3875db2f26eSSascha Wildner     cx_ptr++;
3884eee58faSSepherosa Ziehau     sc->cst_cx_count++;
3895db2f26eSSascha Wildner 
3905db2f26eSSascha Wildner     /*
3915db2f26eSSascha Wildner      * The spec says P_BLK must be 6 bytes long.  However, some systems
3925db2f26eSSascha Wildner      * use it to indicate a fractional set of features present so we
3935db2f26eSSascha Wildner      * take 5 as C2.  Some may also have a value of 7 to indicate
3945db2f26eSSascha Wildner      * another C3 but most use _CST for this (as required) and having
3955db2f26eSSascha Wildner      * "only" C1-C3 is not a hardship.
3965db2f26eSSascha Wildner      */
3974eee58faSSepherosa Ziehau     if (sc->cst_p_blk_len < 5)
3985db2f26eSSascha Wildner 	return;
3995db2f26eSSascha Wildner 
4005db2f26eSSascha Wildner     /* Validate and allocate resources for C2 (P_LVL2). */
4015db2f26eSSascha Wildner     gas.SpaceId = ACPI_ADR_SPACE_SYSTEM_IO;
4025db2f26eSSascha Wildner     gas.BitWidth = 8;
4035db2f26eSSascha Wildner     if (AcpiGbl_FADT.C2Latency <= 100) {
4044eee58faSSepherosa Ziehau 	gas.Address = sc->cst_p_blk + 4;
4055db2f26eSSascha Wildner 
4064eee58faSSepherosa Ziehau 	cx_ptr->rid = sc->cst_parent->cpux_next_rid;
4074eee58faSSepherosa Ziehau 	acpi_bus_alloc_gas(sc->cst_dev, &cx_ptr->type, &cx_ptr->rid, &gas,
4086942a279SSepherosa Ziehau 	    &cx_ptr->p_lvlx, RF_SHAREABLE);
4095db2f26eSSascha Wildner 	if (cx_ptr->p_lvlx != NULL) {
4104eee58faSSepherosa Ziehau 	    sc->cst_parent->cpux_next_rid++;
4115db2f26eSSascha Wildner 	    cx_ptr->type = ACPI_STATE_C2;
4125db2f26eSSascha Wildner 	    cx_ptr->trans_lat = AcpiGbl_FADT.C2Latency;
4135db2f26eSSascha Wildner 	    cx_ptr++;
4144eee58faSSepherosa Ziehau 	    sc->cst_cx_count++;
4154eee58faSSepherosa Ziehau 	    sc->cst_non_c3 = 1;
4165db2f26eSSascha Wildner 	}
4175db2f26eSSascha Wildner     }
4184eee58faSSepherosa Ziehau     if (sc->cst_p_blk_len < 6)
4195db2f26eSSascha Wildner 	return;
4205db2f26eSSascha Wildner 
4215db2f26eSSascha Wildner     /* Validate and allocate resources for C3 (P_LVL3). */
4225db2f26eSSascha Wildner     if (AcpiGbl_FADT.C3Latency <= 1000 && !(cpu_quirks & CPU_QUIRK_NO_C3)) {
4234eee58faSSepherosa Ziehau 	gas.Address = sc->cst_p_blk + 5;
4245db2f26eSSascha Wildner 
4254eee58faSSepherosa Ziehau 	cx_ptr->rid = sc->cst_parent->cpux_next_rid;
4264eee58faSSepherosa Ziehau 	acpi_bus_alloc_gas(sc->cst_dev, &cx_ptr->type, &cx_ptr->rid, &gas,
4275db2f26eSSascha Wildner 	    &cx_ptr->p_lvlx, RF_SHAREABLE);
4285db2f26eSSascha Wildner 	if (cx_ptr->p_lvlx != NULL) {
4294eee58faSSepherosa Ziehau 	    sc->cst_parent->cpux_next_rid++;
4305db2f26eSSascha Wildner 	    cx_ptr->type = ACPI_STATE_C3;
4315db2f26eSSascha Wildner 	    cx_ptr->trans_lat = AcpiGbl_FADT.C3Latency;
4325db2f26eSSascha Wildner 	    cx_ptr++;
4334eee58faSSepherosa Ziehau 	    sc->cst_cx_count++;
4345db2f26eSSascha Wildner 	}
4355db2f26eSSascha Wildner     }
4365db2f26eSSascha Wildner }
4375db2f26eSSascha Wildner 
4385db2f26eSSascha Wildner /*
4395db2f26eSSascha Wildner  * Parse a _CST package and set up its Cx states.  Since the _CST object
4405db2f26eSSascha Wildner  * can change dynamically, our notify handler may call this function
4415db2f26eSSascha Wildner  * to clean up and probe the new _CST package.
4425db2f26eSSascha Wildner  */
4435db2f26eSSascha Wildner static int
4444eee58faSSepherosa Ziehau acpi_cpu_cx_cst(struct acpi_cst_softc *sc)
4455db2f26eSSascha Wildner {
4465db2f26eSSascha Wildner     struct	 acpi_cx *cx_ptr;
4475db2f26eSSascha Wildner     ACPI_STATUS	 status;
4485db2f26eSSascha Wildner     ACPI_BUFFER	 buf;
4495db2f26eSSascha Wildner     ACPI_OBJECT	*top;
4505db2f26eSSascha Wildner     ACPI_OBJECT	*pkg;
4515db2f26eSSascha Wildner     uint32_t	 count;
4525db2f26eSSascha Wildner     int		 i;
4535db2f26eSSascha Wildner 
4545db2f26eSSascha Wildner     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
4555db2f26eSSascha Wildner 
4565db2f26eSSascha Wildner     buf.Pointer = NULL;
4575db2f26eSSascha Wildner     buf.Length = ACPI_ALLOCATE_BUFFER;
4584eee58faSSepherosa Ziehau     status = AcpiEvaluateObject(sc->cst_handle, "_CST", NULL, &buf);
4595db2f26eSSascha Wildner     if (ACPI_FAILURE(status))
4605db2f26eSSascha Wildner 	return (ENXIO);
4615db2f26eSSascha Wildner 
4625db2f26eSSascha Wildner     /* _CST is a package with a count and at least one Cx package. */
4635db2f26eSSascha Wildner     top = (ACPI_OBJECT *)buf.Pointer;
4645db2f26eSSascha Wildner     if (!ACPI_PKG_VALID(top, 2) || acpi_PkgInt32(top, 0, &count) != 0) {
4654eee58faSSepherosa Ziehau 	device_printf(sc->cst_dev, "invalid _CST package\n");
4665db2f26eSSascha Wildner 	AcpiOsFree(buf.Pointer);
4675db2f26eSSascha Wildner 	return (ENXIO);
4685db2f26eSSascha Wildner     }
4695db2f26eSSascha Wildner     if (count != top->Package.Count - 1) {
4704eee58faSSepherosa Ziehau 	device_printf(sc->cst_dev, "invalid _CST state count (%d != %d)\n",
4715db2f26eSSascha Wildner 	       count, top->Package.Count - 1);
4725db2f26eSSascha Wildner 	count = top->Package.Count - 1;
4735db2f26eSSascha Wildner     }
4745db2f26eSSascha Wildner     if (count > MAX_CX_STATES) {
4754eee58faSSepherosa Ziehau 	device_printf(sc->cst_dev, "_CST has too many states (%d)\n", count);
4765db2f26eSSascha Wildner 	count = MAX_CX_STATES;
4775db2f26eSSascha Wildner     }
4785db2f26eSSascha Wildner 
47944806d43SSepherosa Ziehau     sc->cst_flags |= ACPI_CST_FLAG_PROBING;
48044806d43SSepherosa Ziehau     cpu_sfence();
48144806d43SSepherosa Ziehau 
4825db2f26eSSascha Wildner     /* Set up all valid states. */
4834eee58faSSepherosa Ziehau     sc->cst_cx_count = 0;
4844eee58faSSepherosa Ziehau     cx_ptr = sc->cst_cx_states;
4855db2f26eSSascha Wildner     for (i = 0; i < count; i++) {
4865db2f26eSSascha Wildner 	pkg = &top->Package.Elements[i + 1];
4875db2f26eSSascha Wildner 	if (!ACPI_PKG_VALID(pkg, 4) ||
4885db2f26eSSascha Wildner 	    acpi_PkgInt32(pkg, 1, &cx_ptr->type) != 0 ||
4895db2f26eSSascha Wildner 	    acpi_PkgInt32(pkg, 2, &cx_ptr->trans_lat) != 0 ||
4905db2f26eSSascha Wildner 	    acpi_PkgInt32(pkg, 3, &cx_ptr->power) != 0) {
4915db2f26eSSascha Wildner 
4924eee58faSSepherosa Ziehau 	    device_printf(sc->cst_dev, "skipping invalid Cx state package\n");
4935db2f26eSSascha Wildner 	    continue;
4945db2f26eSSascha Wildner 	}
4955db2f26eSSascha Wildner 
4965db2f26eSSascha Wildner 	/* Validate the state to see if we should use it. */
4975db2f26eSSascha Wildner 	switch (cx_ptr->type) {
4985db2f26eSSascha Wildner 	case ACPI_STATE_C1:
4994eee58faSSepherosa Ziehau 	    sc->cst_non_c3 = i;
5005db2f26eSSascha Wildner 	    cx_ptr++;
5014eee58faSSepherosa Ziehau 	    sc->cst_cx_count++;
5025db2f26eSSascha Wildner 	    continue;
5035db2f26eSSascha Wildner 	case ACPI_STATE_C2:
5044eee58faSSepherosa Ziehau 	    sc->cst_non_c3 = i;
5055db2f26eSSascha Wildner 	    break;
5065db2f26eSSascha Wildner 	case ACPI_STATE_C3:
5075db2f26eSSascha Wildner 	default:
5085db2f26eSSascha Wildner 	    if ((cpu_quirks & CPU_QUIRK_NO_C3) != 0) {
5095db2f26eSSascha Wildner 
5105db2f26eSSascha Wildner 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
5115db2f26eSSascha Wildner 				 "acpi_cpu%d: C3[%d] not available.\n",
5124eee58faSSepherosa Ziehau 				 device_get_unit(sc->cst_dev), i));
5135db2f26eSSascha Wildner 		continue;
5145db2f26eSSascha Wildner 	    }
5155db2f26eSSascha Wildner 	    break;
5165db2f26eSSascha Wildner 	}
5175db2f26eSSascha Wildner 
5185db2f26eSSascha Wildner #ifdef notyet
5195db2f26eSSascha Wildner 	/* Free up any previous register. */
5205db2f26eSSascha Wildner 	if (cx_ptr->p_lvlx != NULL) {
5214eee58faSSepherosa Ziehau 	    bus_release_resource(sc->cst_dev, 0, 0, cx_ptr->p_lvlx);
5225db2f26eSSascha Wildner 	    cx_ptr->p_lvlx = NULL;
5235db2f26eSSascha Wildner 	}
5245db2f26eSSascha Wildner #endif
5255db2f26eSSascha Wildner 
5265db2f26eSSascha Wildner 	/* Allocate the control register for C2 or C3. */
5274eee58faSSepherosa Ziehau 	cx_ptr->rid = sc->cst_parent->cpux_next_rid;
5284eee58faSSepherosa Ziehau 	acpi_PkgGas(sc->cst_dev, pkg, 0, &cx_ptr->res_type, &cx_ptr->rid,
5296942a279SSepherosa Ziehau 	    &cx_ptr->p_lvlx, RF_SHAREABLE);
5305db2f26eSSascha Wildner 	if (cx_ptr->p_lvlx) {
5314eee58faSSepherosa Ziehau 	    sc->cst_parent->cpux_next_rid++;
5325db2f26eSSascha Wildner 	    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
5335db2f26eSSascha Wildner 			     "acpi_cpu%d: Got C%d - %d latency\n",
5344eee58faSSepherosa Ziehau 			     device_get_unit(sc->cst_dev), cx_ptr->type,
5355db2f26eSSascha Wildner 			     cx_ptr->trans_lat));
5365db2f26eSSascha Wildner 	    cx_ptr++;
5374eee58faSSepherosa Ziehau 	    sc->cst_cx_count++;
5385db2f26eSSascha Wildner 	}
5395db2f26eSSascha Wildner     }
5405db2f26eSSascha Wildner     AcpiOsFree(buf.Pointer);
5415db2f26eSSascha Wildner 
5421d730338SSepherosa Ziehau     /*
5431d730338SSepherosa Ziehau      * Fix up the lowest Cx being used
5441d730338SSepherosa Ziehau      */
5454eee58faSSepherosa Ziehau     if (sc->cst_cx_lowest_req < sc->cst_cx_count)
5464eee58faSSepherosa Ziehau 	sc->cst_cx_lowest = sc->cst_cx_lowest_req;
5474eee58faSSepherosa Ziehau     if (sc->cst_cx_lowest > sc->cst_cx_count - 1)
5484eee58faSSepherosa Ziehau 	sc->cst_cx_lowest = sc->cst_cx_count - 1;
5491d730338SSepherosa Ziehau 
550febc8c49SSepherosa Ziehau     /*
551febc8c49SSepherosa Ziehau      * Cache the lowest non-C3 state.
5524eee58faSSepherosa Ziehau      * NOTE: must after cst_cx_lowest is set.
553febc8c49SSepherosa Ziehau      */
554febc8c49SSepherosa Ziehau     acpi_cpu_cx_non_c3(sc);
555febc8c49SSepherosa Ziehau 
55644806d43SSepherosa Ziehau     cpu_sfence();
55744806d43SSepherosa Ziehau     sc->cst_flags &= ~ACPI_CST_FLAG_PROBING;
55844806d43SSepherosa Ziehau 
5595db2f26eSSascha Wildner     return (0);
5605db2f26eSSascha Wildner }
5615db2f26eSSascha Wildner 
56244806d43SSepherosa Ziehau static void
56344806d43SSepherosa Ziehau acpi_cst_probe_handler(netmsg_t msg)
56444806d43SSepherosa Ziehau {
56544806d43SSepherosa Ziehau     struct netmsg_acpi_cst *rmsg = (struct netmsg_acpi_cst *)msg;
56644806d43SSepherosa Ziehau     int error;
56744806d43SSepherosa Ziehau 
56844806d43SSepherosa Ziehau     error = acpi_cpu_cx_cst(rmsg->sc);
56944806d43SSepherosa Ziehau     lwkt_replymsg(&rmsg->base.lmsg, error);
57044806d43SSepherosa Ziehau }
57144806d43SSepherosa Ziehau 
57244806d43SSepherosa Ziehau static int
5734eee58faSSepherosa Ziehau acpi_cpu_cx_cst_dispatch(struct acpi_cst_softc *sc)
57444806d43SSepherosa Ziehau {
57544806d43SSepherosa Ziehau     struct netmsg_acpi_cst msg;
57644806d43SSepherosa Ziehau 
57744806d43SSepherosa Ziehau     netmsg_init(&msg.base, NULL, &curthread->td_msgport, MSGF_PRIORITY,
57844806d43SSepherosa Ziehau 	acpi_cst_probe_handler);
57944806d43SSepherosa Ziehau     msg.sc = sc;
58044806d43SSepherosa Ziehau 
5814eee58faSSepherosa Ziehau     return lwkt_domsg(netisr_cpuport(sc->cst_cpuid), &msg.base.lmsg, 0);
58244806d43SSepherosa Ziehau }
58344806d43SSepherosa Ziehau 
5845db2f26eSSascha Wildner /*
5855db2f26eSSascha Wildner  * Call this *after* all CPUs have been attached.
5865db2f26eSSascha Wildner  */
5875db2f26eSSascha Wildner static void
5885db2f26eSSascha Wildner acpi_cpu_startup(void *arg)
5895db2f26eSSascha Wildner {
5904eee58faSSepherosa Ziehau     struct acpi_cst_softc *sc;
5915db2f26eSSascha Wildner     int i;
5925db2f26eSSascha Wildner 
5935db2f26eSSascha Wildner     /* Get set of CPU devices */
594*41e658a2SSepherosa Ziehau     devclass_get_devices(acpi_cst_devclass, &cpu_devices, &cpu_ndevices);
5955db2f26eSSascha Wildner 
5965db2f26eSSascha Wildner     /*
5975db2f26eSSascha Wildner      * Setup any quirks that might necessary now that we have probed
5985db2f26eSSascha Wildner      * all the CPUs
5995db2f26eSSascha Wildner      */
6005db2f26eSSascha Wildner     acpi_cpu_quirks();
6015db2f26eSSascha Wildner 
6025db2f26eSSascha Wildner     if (cpu_cx_generic) {
6035db2f26eSSascha Wildner 	/*
6045db2f26eSSascha Wildner 	 * We are using generic Cx mode, probe for available Cx states
6055db2f26eSSascha Wildner 	 * for all processors.
6065db2f26eSSascha Wildner 	 */
6075db2f26eSSascha Wildner 	for (i = 0; i < cpu_ndevices; i++) {
6085db2f26eSSascha Wildner 	    sc = device_get_softc(cpu_devices[i]);
6095db2f26eSSascha Wildner 	    acpi_cpu_generic_cx_probe(sc);
6105db2f26eSSascha Wildner 	}
6115db2f26eSSascha Wildner     } else {
6125db2f26eSSascha Wildner 	/*
6135db2f26eSSascha Wildner 	 * We are using _CST mode, remove C3 state if necessary.
6144cf48621SSepherosa Ziehau 	 *
6155db2f26eSSascha Wildner 	 * As we now know for sure that we will be using _CST mode
6165db2f26eSSascha Wildner 	 * install our notify handler.
6175db2f26eSSascha Wildner 	 */
6185db2f26eSSascha Wildner 	for (i = 0; i < cpu_ndevices; i++) {
6195db2f26eSSascha Wildner 	    sc = device_get_softc(cpu_devices[i]);
620ff830b69SSepherosa Ziehau 	    if (cpu_quirks & CPU_QUIRK_NO_C3)
6214eee58faSSepherosa Ziehau 		sc->cst_cx_count = sc->cst_non_c3 + 1;
6224eee58faSSepherosa Ziehau 	    sc->cst_parent->cpux_cst_notify = acpi_cpu_cst_notify;
6235db2f26eSSascha Wildner 	}
6245db2f26eSSascha Wildner     }
6254cf48621SSepherosa Ziehau     acpi_cpu_global_cx_count();
6265db2f26eSSascha Wildner 
6275db2f26eSSascha Wildner     /* Perform Cx final initialization. */
6285db2f26eSSascha Wildner     for (i = 0; i < cpu_ndevices; i++) {
6295db2f26eSSascha Wildner 	sc = device_get_softc(cpu_devices[i]);
6305db2f26eSSascha Wildner 	acpi_cpu_startup_cx(sc);
6315db2f26eSSascha Wildner 
6324eee58faSSepherosa Ziehau 	if (sc->cst_parent->glob_sysctl_tree != NULL) {
6334eee58faSSepherosa Ziehau 	    struct acpi_cpux_softc *cpux = sc->cst_parent;
6345db2f26eSSascha Wildner 
6355db2f26eSSascha Wildner 	    /* Add a sysctl handler to handle global Cx lowest setting */
6365db2f26eSSascha Wildner 	    SYSCTL_ADD_PROC(&cpux->glob_sysctl_ctx,
6375db2f26eSSascha Wildner 	    		    SYSCTL_CHILDREN(cpux->glob_sysctl_tree),
6385db2f26eSSascha Wildner 			    OID_AUTO, "cx_lowest",
6395db2f26eSSascha Wildner 			    CTLTYPE_STRING | CTLFLAG_RW, NULL, 0,
6405db2f26eSSascha Wildner 			    acpi_cpu_global_cx_lowest_sysctl, "A",
6411d730338SSepherosa Ziehau 			    "Requested global lowest Cx sleep state");
6421d730338SSepherosa Ziehau 	    SYSCTL_ADD_PROC(&cpux->glob_sysctl_ctx,
6431d730338SSepherosa Ziehau 	    		    SYSCTL_CHILDREN(cpux->glob_sysctl_tree),
6441d730338SSepherosa Ziehau 			    OID_AUTO, "cx_lowest_use",
6451d730338SSepherosa Ziehau 			    CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
6461d730338SSepherosa Ziehau 			    acpi_cpu_global_cx_lowest_use_sysctl, "A",
6475db2f26eSSascha Wildner 			    "Global lowest Cx sleep state to use");
6485db2f26eSSascha Wildner 	}
6495db2f26eSSascha Wildner     }
6505db2f26eSSascha Wildner 
6515db2f26eSSascha Wildner     /* Take over idling from cpu_idle_default(). */
6525db2f26eSSascha Wildner     cpu_cx_lowest = 0;
6531d730338SSepherosa Ziehau     cpu_cx_lowest_req = 0;
6545db2f26eSSascha Wildner     cpu_disable_idle = FALSE;
6555db2f26eSSascha Wildner     cpu_idle_hook = acpi_cpu_idle;
6565db2f26eSSascha Wildner }
6575db2f26eSSascha Wildner 
6585db2f26eSSascha Wildner static void
6594eee58faSSepherosa Ziehau acpi_cpu_cx_list(struct acpi_cst_softc *sc)
6605db2f26eSSascha Wildner {
6615db2f26eSSascha Wildner     struct sbuf sb;
6625db2f26eSSascha Wildner     int i;
6635db2f26eSSascha Wildner 
6645db2f26eSSascha Wildner     /*
6655db2f26eSSascha Wildner      * Set up the list of Cx states
6665db2f26eSSascha Wildner      */
6674eee58faSSepherosa Ziehau     sbuf_new(&sb, sc->cst_cx_supported, sizeof(sc->cst_cx_supported),
6685db2f26eSSascha Wildner 	SBUF_FIXEDLEN);
6694eee58faSSepherosa Ziehau     for (i = 0; i < sc->cst_cx_count; i++)
6704eee58faSSepherosa Ziehau 	sbuf_printf(&sb, "C%d/%d ", i + 1, sc->cst_cx_states[i].trans_lat);
6715db2f26eSSascha Wildner     sbuf_trim(&sb);
6725db2f26eSSascha Wildner     sbuf_finish(&sb);
6735db2f26eSSascha Wildner }
6745db2f26eSSascha Wildner 
6755db2f26eSSascha Wildner static void
6764eee58faSSepherosa Ziehau acpi_cpu_startup_cx(struct acpi_cst_softc *sc)
6775db2f26eSSascha Wildner {
6784eee58faSSepherosa Ziehau     struct acpi_cpux_softc *cpux = sc->cst_parent;
6795db2f26eSSascha Wildner 
6805db2f26eSSascha Wildner     acpi_cpu_cx_list(sc);
6815db2f26eSSascha Wildner 
6825db2f26eSSascha Wildner     SYSCTL_ADD_STRING(&cpux->pcpu_sysctl_ctx,
6835db2f26eSSascha Wildner 		      SYSCTL_CHILDREN(cpux->pcpu_sysctl_tree),
6845db2f26eSSascha Wildner 		      OID_AUTO, "cx_supported", CTLFLAG_RD,
6854eee58faSSepherosa Ziehau 		      sc->cst_cx_supported, 0,
6865db2f26eSSascha Wildner 		      "Cx/microsecond values for supported Cx states");
6875db2f26eSSascha Wildner     SYSCTL_ADD_PROC(&cpux->pcpu_sysctl_ctx,
6885db2f26eSSascha Wildner 		    SYSCTL_CHILDREN(cpux->pcpu_sysctl_tree),
6895db2f26eSSascha Wildner 		    OID_AUTO, "cx_lowest", CTLTYPE_STRING | CTLFLAG_RW,
6905db2f26eSSascha Wildner 		    (void *)sc, 0, acpi_cpu_cx_lowest_sysctl, "A",
6911d730338SSepherosa Ziehau 		    "requested lowest Cx sleep state");
6921d730338SSepherosa Ziehau     SYSCTL_ADD_PROC(&cpux->pcpu_sysctl_ctx,
6931d730338SSepherosa Ziehau 		    SYSCTL_CHILDREN(cpux->pcpu_sysctl_tree),
6941d730338SSepherosa Ziehau 		    OID_AUTO, "cx_lowest_use", CTLTYPE_STRING | CTLFLAG_RD,
6951d730338SSepherosa Ziehau 		    (void *)sc, 0, acpi_cpu_cx_lowest_use_sysctl, "A",
6965db2f26eSSascha Wildner 		    "lowest Cx sleep state to use");
6975db2f26eSSascha Wildner     SYSCTL_ADD_PROC(&cpux->pcpu_sysctl_ctx,
6985db2f26eSSascha Wildner 		    SYSCTL_CHILDREN(cpux->pcpu_sysctl_tree),
6995db2f26eSSascha Wildner 		    OID_AUTO, "cx_usage", CTLTYPE_STRING | CTLFLAG_RD,
7005db2f26eSSascha Wildner 		    (void *)sc, 0, acpi_cpu_usage_sysctl, "A",
7015db2f26eSSascha Wildner 		    "percent usage for each Cx state");
7025db2f26eSSascha Wildner 
7035db2f26eSSascha Wildner #ifdef notyet
7045db2f26eSSascha Wildner     /* Signal platform that we can handle _CST notification. */
7055db2f26eSSascha Wildner     if (!cpu_cx_generic && cpu_cst_cnt != 0) {
7065db2f26eSSascha Wildner 	ACPI_LOCK(acpi);
7075db2f26eSSascha Wildner 	AcpiOsWritePort(cpu_smi_cmd, cpu_cst_cnt, 8);
7085db2f26eSSascha Wildner 	ACPI_UNLOCK(acpi);
7095db2f26eSSascha Wildner     }
7105db2f26eSSascha Wildner #endif
7115db2f26eSSascha Wildner }
7125db2f26eSSascha Wildner 
7135db2f26eSSascha Wildner /*
7145db2f26eSSascha Wildner  * Idle the CPU in the lowest state possible.  This function is called with
7155db2f26eSSascha Wildner  * interrupts disabled.  Note that once it re-enables interrupts, a task
7165db2f26eSSascha Wildner  * switch can occur so do not access shared data (i.e. the softc) after
7175db2f26eSSascha Wildner  * interrupts are re-enabled.
7185db2f26eSSascha Wildner  */
7195db2f26eSSascha Wildner static void
7205db2f26eSSascha Wildner acpi_cpu_idle(void)
7215db2f26eSSascha Wildner {
7224eee58faSSepherosa Ziehau     struct	acpi_cst_softc *sc;
7235db2f26eSSascha Wildner     struct	acpi_cx *cx_next;
7245db2f26eSSascha Wildner     uint64_t	start_time, end_time;
7255db2f26eSSascha Wildner     int		bm_active, cx_next_idx, i;
7265db2f26eSSascha Wildner 
7275db2f26eSSascha Wildner     /* If disabled, return immediately. */
7285db2f26eSSascha Wildner     if (cpu_disable_idle) {
7295db2f26eSSascha Wildner 	ACPI_ENABLE_IRQS();
7305db2f26eSSascha Wildner 	return;
7315db2f26eSSascha Wildner     }
7325db2f26eSSascha Wildner 
7335db2f26eSSascha Wildner     /*
7345db2f26eSSascha Wildner      * Look up our CPU id to get our softc.  If it's NULL, we'll use C1
7355db2f26eSSascha Wildner      * since there is no ACPI processor object for this CPU.  This occurs
7365db2f26eSSascha Wildner      * for logical CPUs in the HTT case.
7375db2f26eSSascha Wildner      */
7385db2f26eSSascha Wildner     sc = cpu_softc[mdcpu->mi.gd_cpuid];
7395db2f26eSSascha Wildner     if (sc == NULL) {
7405db2f26eSSascha Wildner 	acpi_cpu_c1();
7415db2f26eSSascha Wildner 	return;
7425db2f26eSSascha Wildner     }
7435db2f26eSSascha Wildner 
74444806d43SSepherosa Ziehau     /* Still probing; use C1 */
74544806d43SSepherosa Ziehau     if (sc->cst_flags & ACPI_CST_FLAG_PROBING) {
74644806d43SSepherosa Ziehau 	acpi_cpu_c1();
74744806d43SSepherosa Ziehau 	return;
74844806d43SSepherosa Ziehau     }
74944806d43SSepherosa Ziehau 
7505db2f26eSSascha Wildner     /* Find the lowest state that has small enough latency. */
7515db2f26eSSascha Wildner     cx_next_idx = 0;
7524eee58faSSepherosa Ziehau     for (i = sc->cst_cx_lowest; i >= 0; i--) {
7534eee58faSSepherosa Ziehau 	if (sc->cst_cx_states[i].trans_lat * 3 <= sc->cst_prev_sleep) {
7545db2f26eSSascha Wildner 	    cx_next_idx = i;
7555db2f26eSSascha Wildner 	    break;
7565db2f26eSSascha Wildner 	}
7575db2f26eSSascha Wildner     }
7585db2f26eSSascha Wildner 
7595db2f26eSSascha Wildner     /*
7605db2f26eSSascha Wildner      * Check for bus master activity.  If there was activity, clear
7615db2f26eSSascha Wildner      * the bit and use the lowest non-C3 state.  Note that the USB
7625db2f26eSSascha Wildner      * driver polling for new devices keeps this bit set all the
7635db2f26eSSascha Wildner      * time if USB is loaded.
7645db2f26eSSascha Wildner      */
7655db2f26eSSascha Wildner     if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) {
7665db2f26eSSascha Wildner 	AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, &bm_active);
7675db2f26eSSascha Wildner 	if (bm_active != 0) {
7685db2f26eSSascha Wildner 	    AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, 1);
7694eee58faSSepherosa Ziehau 	    cx_next_idx = min(cx_next_idx, sc->cst_non_c3);
7705db2f26eSSascha Wildner 	}
7715db2f26eSSascha Wildner     }
7725db2f26eSSascha Wildner 
7735db2f26eSSascha Wildner     /* Select the next state and update statistics. */
7744eee58faSSepherosa Ziehau     cx_next = &sc->cst_cx_states[cx_next_idx];
7754eee58faSSepherosa Ziehau     sc->cst_cx_stats[cx_next_idx]++;
7765db2f26eSSascha Wildner     KASSERT(cx_next->type != ACPI_STATE_C0, ("acpi_cpu_idle: C0 sleep"));
7775db2f26eSSascha Wildner 
7785db2f26eSSascha Wildner     /*
7795db2f26eSSascha Wildner      * Execute HLT (or equivalent) and wait for an interrupt.  We can't
7805db2f26eSSascha Wildner      * calculate the time spent in C1 since the place we wake up is an
7815db2f26eSSascha Wildner      * ISR.  Assume we slept half of quantum and return.
7825db2f26eSSascha Wildner      */
7835db2f26eSSascha Wildner     if (cx_next->type == ACPI_STATE_C1) {
7844eee58faSSepherosa Ziehau 	sc->cst_prev_sleep = (sc->cst_prev_sleep * 3 + 500000 / hz) / 4;
7855db2f26eSSascha Wildner 	acpi_cpu_c1();
7865db2f26eSSascha Wildner 	return;
7875db2f26eSSascha Wildner     }
7885db2f26eSSascha Wildner 
7895db2f26eSSascha Wildner     /*
790b42fff25SSepherosa Ziehau      * For C3(+), disable bus master arbitration and enable bus master wake
7915db2f26eSSascha Wildner      * if BM control is available, otherwise flush the CPU cache.
7925db2f26eSSascha Wildner      */
793b42fff25SSepherosa Ziehau     if (cx_next->type >= ACPI_STATE_C3) {
7945db2f26eSSascha Wildner 	if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) {
7955db2f26eSSascha Wildner 	    AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 1);
7965db2f26eSSascha Wildner 	    AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 1);
7975db2f26eSSascha Wildner 	} else
7985db2f26eSSascha Wildner 	    ACPI_FLUSH_CPU_CACHE();
7995db2f26eSSascha Wildner     }
8005db2f26eSSascha Wildner 
8015db2f26eSSascha Wildner     /*
8025db2f26eSSascha Wildner      * Read from P_LVLx to enter C2(+), checking time spent asleep.
8035db2f26eSSascha Wildner      * Use the ACPI timer for measuring sleep time.  Since we need to
8045db2f26eSSascha Wildner      * get the time very close to the CPU start/stop clock logic, this
8055db2f26eSSascha Wildner      * is the only reliable time source.
8065db2f26eSSascha Wildner      */
8075db2f26eSSascha Wildner     AcpiRead(&start_time, &AcpiGbl_FADT.XPmTimerBlock);
8085db2f26eSSascha Wildner     CPU_GET_REG(cx_next->p_lvlx, 1);
8095db2f26eSSascha Wildner 
8105db2f26eSSascha Wildner     /*
8115db2f26eSSascha Wildner      * Read the end time twice.  Since it may take an arbitrary time
8125db2f26eSSascha Wildner      * to enter the idle state, the first read may be executed before
8135db2f26eSSascha Wildner      * the processor has stopped.  Doing it again provides enough
8145db2f26eSSascha Wildner      * margin that we are certain to have a correct value.
8155db2f26eSSascha Wildner      */
8165db2f26eSSascha Wildner     AcpiRead(&end_time, &AcpiGbl_FADT.XPmTimerBlock);
8175db2f26eSSascha Wildner     AcpiRead(&end_time, &AcpiGbl_FADT.XPmTimerBlock);
8185db2f26eSSascha Wildner 
8195db2f26eSSascha Wildner     /* Enable bus master arbitration and disable bus master wakeup. */
820b42fff25SSepherosa Ziehau     if (cx_next->type >= ACPI_STATE_C3) {
8215db2f26eSSascha Wildner 	if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) {
8225db2f26eSSascha Wildner 	    AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 0);
8235db2f26eSSascha Wildner 	    AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0);
8245db2f26eSSascha Wildner 	}
8255db2f26eSSascha Wildner     }
8265db2f26eSSascha Wildner     ACPI_ENABLE_IRQS();
8275db2f26eSSascha Wildner 
8285db2f26eSSascha Wildner     /* Find the actual time asleep in microseconds. */
8295db2f26eSSascha Wildner     end_time = acpi_TimerDelta(end_time, start_time);
8304eee58faSSepherosa Ziehau     sc->cst_prev_sleep = (sc->cst_prev_sleep * 3 + PM_USEC(end_time)) / 4;
8315db2f26eSSascha Wildner }
8325db2f26eSSascha Wildner 
8335db2f26eSSascha Wildner /*
8345db2f26eSSascha Wildner  * Re-evaluate the _CST object when we are notified that it changed.
8355db2f26eSSascha Wildner  */
8365db2f26eSSascha Wildner static void
8375db2f26eSSascha Wildner acpi_cpu_cst_notify(device_t dev)
8385db2f26eSSascha Wildner {
8394eee58faSSepherosa Ziehau     struct acpi_cst_softc *sc = device_get_softc(dev);
8405db2f26eSSascha Wildner 
841b45624acSSepherosa Ziehau     KASSERT(curthread->td_type != TD_TYPE_NETISR,
842b45624acSSepherosa Ziehau         ("notify in netisr%d", mycpuid));
843b45624acSSepherosa Ziehau 
844b45624acSSepherosa Ziehau     lwkt_serialize_enter(&cpu_cx_slize);
845b45624acSSepherosa Ziehau 
8465db2f26eSSascha Wildner     /* Update the list of Cx states. */
84744806d43SSepherosa Ziehau     acpi_cpu_cx_cst_dispatch(sc);
8485db2f26eSSascha Wildner     acpi_cpu_cx_list(sc);
8495db2f26eSSascha Wildner 
8505db2f26eSSascha Wildner     /* Update the new lowest useable Cx state for all CPUs. */
8514cf48621SSepherosa Ziehau     acpi_cpu_global_cx_count();
8521d730338SSepherosa Ziehau 
8531d730338SSepherosa Ziehau     /*
8541d730338SSepherosa Ziehau      * Fix up the lowest Cx being used
8551d730338SSepherosa Ziehau      */
8561d730338SSepherosa Ziehau     if (cpu_cx_lowest_req < cpu_cx_count)
8571d730338SSepherosa Ziehau 	cpu_cx_lowest = cpu_cx_lowest_req;
8581d730338SSepherosa Ziehau     if (cpu_cx_lowest > cpu_cx_count - 1)
8591d730338SSepherosa Ziehau 	cpu_cx_lowest = cpu_cx_count - 1;
8601d730338SSepherosa Ziehau 
861b45624acSSepherosa Ziehau     lwkt_serialize_exit(&cpu_cx_slize);
8625db2f26eSSascha Wildner }
8635db2f26eSSascha Wildner 
8645db2f26eSSascha Wildner static int
8655db2f26eSSascha Wildner acpi_cpu_quirks(void)
8665db2f26eSSascha Wildner {
8675db2f26eSSascha Wildner     device_t acpi_dev;
8685db2f26eSSascha Wildner     uint32_t val;
8695db2f26eSSascha Wildner 
8705db2f26eSSascha Wildner     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
8715db2f26eSSascha Wildner 
8725db2f26eSSascha Wildner     /*
8735db2f26eSSascha Wildner      * Bus mastering arbitration control is needed to keep caches coherent
8745db2f26eSSascha Wildner      * while sleeping in C3.  If it's not present but a working flush cache
8755db2f26eSSascha Wildner      * instruction is present, flush the caches before entering C3 instead.
8765db2f26eSSascha Wildner      * Otherwise, just disable C3 completely.
8775db2f26eSSascha Wildner      */
8785db2f26eSSascha Wildner     if (AcpiGbl_FADT.Pm2ControlBlock == 0 ||
8795db2f26eSSascha Wildner 	AcpiGbl_FADT.Pm2ControlLength == 0) {
8805db2f26eSSascha Wildner 	if ((AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD) &&
8815db2f26eSSascha Wildner 	    (AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD_FLUSH) == 0) {
8825db2f26eSSascha Wildner 	    cpu_quirks |= CPU_QUIRK_NO_BM_CTRL;
8835db2f26eSSascha Wildner 	    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
8845db2f26eSSascha Wildner 		"acpi_cpu: no BM control, using flush cache method\n"));
8855db2f26eSSascha Wildner 	} else {
8865db2f26eSSascha Wildner 	    cpu_quirks |= CPU_QUIRK_NO_C3;
8875db2f26eSSascha Wildner 	    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
8885db2f26eSSascha Wildner 		"acpi_cpu: no BM control, C3 not available\n"));
8895db2f26eSSascha Wildner 	}
8905db2f26eSSascha Wildner     }
8915db2f26eSSascha Wildner 
8925db2f26eSSascha Wildner     /*
8935db2f26eSSascha Wildner      * If we are using generic Cx mode, C3 on multiple CPUs requires using
8945db2f26eSSascha Wildner      * the expensive flush cache instruction.
8955db2f26eSSascha Wildner      */
8965db2f26eSSascha Wildner     if (cpu_cx_generic && ncpus > 1) {
8975db2f26eSSascha Wildner 	cpu_quirks |= CPU_QUIRK_NO_BM_CTRL;
8985db2f26eSSascha Wildner 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
8995db2f26eSSascha Wildner 	    "acpi_cpu: SMP, using flush cache mode for C3\n"));
9005db2f26eSSascha Wildner     }
9015db2f26eSSascha Wildner 
9025db2f26eSSascha Wildner     /* Look for various quirks of the PIIX4 part. */
9035db2f26eSSascha Wildner     acpi_dev = pci_find_device(PCI_VENDOR_INTEL, PCI_DEVICE_82371AB_3);
9045db2f26eSSascha Wildner     if (acpi_dev != NULL) {
9055db2f26eSSascha Wildner 	switch (pci_get_revid(acpi_dev)) {
9065db2f26eSSascha Wildner 	/*
9075db2f26eSSascha Wildner 	 * Disable C3 support for all PIIX4 chipsets.  Some of these parts
9085db2f26eSSascha Wildner 	 * do not report the BMIDE status to the BM status register and
9095db2f26eSSascha Wildner 	 * others have a livelock bug if Type-F DMA is enabled.  Linux
9105db2f26eSSascha Wildner 	 * works around the BMIDE bug by reading the BM status directly
9115db2f26eSSascha Wildner 	 * but we take the simpler approach of disabling C3 for these
9125db2f26eSSascha Wildner 	 * parts.
9135db2f26eSSascha Wildner 	 *
9145db2f26eSSascha Wildner 	 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
9155db2f26eSSascha Wildner 	 * Livelock") from the January 2002 PIIX4 specification update.
9165db2f26eSSascha Wildner 	 * Applies to all PIIX4 models.
9175db2f26eSSascha Wildner 	 *
9185db2f26eSSascha Wildner 	 * Also, make sure that all interrupts cause a "Stop Break"
9195db2f26eSSascha Wildner 	 * event to exit from C2 state.
9205db2f26eSSascha Wildner 	 * Also, BRLD_EN_BM (ACPI_BITREG_BUS_MASTER_RLD in ACPI-speak)
9215db2f26eSSascha Wildner 	 * should be set to zero, otherwise it causes C2 to short-sleep.
9225db2f26eSSascha Wildner 	 * PIIX4 doesn't properly support C3 and bus master activity
9235db2f26eSSascha Wildner 	 * need not break out of C2.
9245db2f26eSSascha Wildner 	 */
9255db2f26eSSascha Wildner 	case PCI_REVISION_A_STEP:
9265db2f26eSSascha Wildner 	case PCI_REVISION_B_STEP:
9275db2f26eSSascha Wildner 	case PCI_REVISION_4E:
9285db2f26eSSascha Wildner 	case PCI_REVISION_4M:
9295db2f26eSSascha Wildner 	    cpu_quirks |= CPU_QUIRK_NO_C3;
9305db2f26eSSascha Wildner 	    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
9315db2f26eSSascha Wildner 		"acpi_cpu: working around PIIX4 bug, disabling C3\n"));
9325db2f26eSSascha Wildner 
9335db2f26eSSascha Wildner 	    val = pci_read_config(acpi_dev, PIIX4_DEVACTB_REG, 4);
9345db2f26eSSascha Wildner 	    if ((val & PIIX4_STOP_BREAK_MASK) != PIIX4_STOP_BREAK_MASK) {
9355db2f26eSSascha Wildner 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
9365db2f26eSSascha Wildner 		    "acpi_cpu: PIIX4: enabling IRQs to generate Stop Break\n"));
9375db2f26eSSascha Wildner 	    	val |= PIIX4_STOP_BREAK_MASK;
9385db2f26eSSascha Wildner 		pci_write_config(acpi_dev, PIIX4_DEVACTB_REG, val, 4);
9395db2f26eSSascha Wildner 	    }
9405db2f26eSSascha Wildner 	    AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_RLD, &val);
9415db2f26eSSascha Wildner 	    if (val) {
9425db2f26eSSascha Wildner 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
9435db2f26eSSascha Wildner 		    "acpi_cpu: PIIX4: reset BRLD_EN_BM\n"));
9445db2f26eSSascha Wildner 		AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0);
9455db2f26eSSascha Wildner 	    }
9465db2f26eSSascha Wildner 	    break;
9475db2f26eSSascha Wildner 	default:
9485db2f26eSSascha Wildner 	    break;
9495db2f26eSSascha Wildner 	}
9505db2f26eSSascha Wildner     }
9515db2f26eSSascha Wildner 
9525db2f26eSSascha Wildner     return (0);
9535db2f26eSSascha Wildner }
9545db2f26eSSascha Wildner 
9555db2f26eSSascha Wildner static int
9565db2f26eSSascha Wildner acpi_cpu_usage_sysctl(SYSCTL_HANDLER_ARGS)
9575db2f26eSSascha Wildner {
9584eee58faSSepherosa Ziehau     struct acpi_cst_softc *sc;
9595db2f26eSSascha Wildner     struct sbuf	 sb;
9605db2f26eSSascha Wildner     char	 buf[128];
9615db2f26eSSascha Wildner     int		 i;
9625db2f26eSSascha Wildner     uintmax_t	 fract, sum, whole;
9635db2f26eSSascha Wildner 
9644eee58faSSepherosa Ziehau     sc = (struct acpi_cst_softc *) arg1;
9655db2f26eSSascha Wildner     sum = 0;
9664eee58faSSepherosa Ziehau     for (i = 0; i < sc->cst_cx_count; i++)
9674eee58faSSepherosa Ziehau 	sum += sc->cst_cx_stats[i];
9685db2f26eSSascha Wildner     sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
9694eee58faSSepherosa Ziehau     for (i = 0; i < sc->cst_cx_count; i++) {
9705db2f26eSSascha Wildner 	if (sum > 0) {
9714eee58faSSepherosa Ziehau 	    whole = (uintmax_t)sc->cst_cx_stats[i] * 100;
9725db2f26eSSascha Wildner 	    fract = (whole % sum) * 100;
9735db2f26eSSascha Wildner 	    sbuf_printf(&sb, "%u.%02u%% ", (u_int)(whole / sum),
9745db2f26eSSascha Wildner 		(u_int)(fract / sum));
9755db2f26eSSascha Wildner 	} else
9765db2f26eSSascha Wildner 	    sbuf_printf(&sb, "0.00%% ");
9775db2f26eSSascha Wildner     }
9784eee58faSSepherosa Ziehau     sbuf_printf(&sb, "last %dus", sc->cst_prev_sleep);
9795db2f26eSSascha Wildner     sbuf_trim(&sb);
9805db2f26eSSascha Wildner     sbuf_finish(&sb);
9815db2f26eSSascha Wildner     sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
9825db2f26eSSascha Wildner     sbuf_delete(&sb);
9835db2f26eSSascha Wildner 
9845db2f26eSSascha Wildner     return (0);
9855db2f26eSSascha Wildner }
9865db2f26eSSascha Wildner 
9875db2f26eSSascha Wildner static int
9884eee58faSSepherosa Ziehau acpi_cpu_set_cx_lowest_oncpu(struct acpi_cst_softc *sc, int val)
9895db2f26eSSascha Wildner {
990de6641b7SSepherosa Ziehau     int old_lowest, error = 0, old_lowest_req;
9915db2f26eSSascha Wildner     uint32_t old_type, type;
9925db2f26eSSascha Wildner 
9934eee58faSSepherosa Ziehau     KKASSERT(mycpuid == sc->cst_cpuid);
994c241507cSSepherosa Ziehau 
995de6641b7SSepherosa Ziehau     old_lowest_req = sc->cst_cx_lowest_req;
9964eee58faSSepherosa Ziehau     sc->cst_cx_lowest_req = val;
997de6641b7SSepherosa Ziehau 
9984eee58faSSepherosa Ziehau     if (val > sc->cst_cx_count - 1)
9994eee58faSSepherosa Ziehau 	val = sc->cst_cx_count - 1;
10004eee58faSSepherosa Ziehau     old_lowest = atomic_swap_int(&sc->cst_cx_lowest, val);
10015db2f26eSSascha Wildner 
10024eee58faSSepherosa Ziehau     old_type = sc->cst_cx_states[old_lowest].type;
10034eee58faSSepherosa Ziehau     type = sc->cst_cx_states[val].type;
1004b42fff25SSepherosa Ziehau     if (old_type >= ACPI_STATE_C3 && type < ACPI_STATE_C3) {
10055db2f26eSSascha Wildner 	KKASSERT(cpu_c3_ncpus > 0);
10065db2f26eSSascha Wildner 	if (atomic_fetchadd_int(&cpu_c3_ncpus, -1) == 1) {
10075db2f26eSSascha Wildner 	    /*
10085db2f26eSSascha Wildner 	     * All of the CPUs exit C3 state, use a better
10095db2f26eSSascha Wildner 	     * one shot timer.
10105db2f26eSSascha Wildner 	     */
10115db2f26eSSascha Wildner 	    error = cputimer_intr_select_caps(CPUTIMER_INTR_CAP_NONE);
10123b24650bSSepherosa Ziehau 	    KKASSERT(!error || error == ERESTART);
10133b24650bSSepherosa Ziehau 	    if (error == ERESTART) {
10143b24650bSSepherosa Ziehau 		if (bootverbose)
10153b24650bSSepherosa Ziehau 		    kprintf("exit C3, restart intr cputimer\n");
10165db2f26eSSascha Wildner 		cputimer_intr_restart();
10175db2f26eSSascha Wildner 	    }
10183b24650bSSepherosa Ziehau     	}
1019b42fff25SSepherosa Ziehau     } else if (type >= ACPI_STATE_C3 && old_type < ACPI_STATE_C3) {
10205db2f26eSSascha Wildner 	if (atomic_fetchadd_int(&cpu_c3_ncpus, 1) == 0) {
10215db2f26eSSascha Wildner 	    /*
1022b42fff25SSepherosa Ziehau 	     * When the first CPU enters C3(+) state, switch
10235db2f26eSSascha Wildner 	     * to an one shot timer, which could handle
1024b42fff25SSepherosa Ziehau 	     * C3(+) state, i.e. the timer will not hang.
10255db2f26eSSascha Wildner 	     */
10265db2f26eSSascha Wildner 	    error = cputimer_intr_select_caps(CPUTIMER_INTR_CAP_PS);
10273b24650bSSepherosa Ziehau 	    if (error == ERESTART) {
10283b24650bSSepherosa Ziehau 		if (bootverbose)
10293b24650bSSepherosa Ziehau 		    kprintf("enter C3, restart intr cputimer\n");
10305db2f26eSSascha Wildner 		cputimer_intr_restart();
10313b24650bSSepherosa Ziehau 	    } else if (error) {
10325db2f26eSSascha Wildner 		kprintf("no suitable intr cputimer found\n");
10335db2f26eSSascha Wildner 
10345db2f26eSSascha Wildner 		/* Restore */
1035de6641b7SSepherosa Ziehau 		sc->cst_cx_lowest_req = old_lowest_req;
10364eee58faSSepherosa Ziehau 		sc->cst_cx_lowest = old_lowest;
10375db2f26eSSascha Wildner 		atomic_fetchadd_int(&cpu_c3_ncpus, -1);
10385db2f26eSSascha Wildner 	    }
10395db2f26eSSascha Wildner 	}
10405db2f26eSSascha Wildner     }
10415db2f26eSSascha Wildner 
10425db2f26eSSascha Wildner     if (error)
10435db2f26eSSascha Wildner 	return error;
10445db2f26eSSascha Wildner 
1045febc8c49SSepherosa Ziehau     /* Cache the new lowest non-C3 state. */
1046febc8c49SSepherosa Ziehau     acpi_cpu_cx_non_c3(sc);
10475db2f26eSSascha Wildner 
10485db2f26eSSascha Wildner     /* Reset the statistics counters. */
10494eee58faSSepherosa Ziehau     bzero(sc->cst_cx_stats, sizeof(sc->cst_cx_stats));
10505db2f26eSSascha Wildner     return (0);
10515db2f26eSSascha Wildner }
10525db2f26eSSascha Wildner 
1053c241507cSSepherosa Ziehau static void
1054c241507cSSepherosa Ziehau acpi_cst_set_lowest_handler(netmsg_t msg)
1055c241507cSSepherosa Ziehau {
1056c241507cSSepherosa Ziehau     struct netmsg_acpi_cst *rmsg = (struct netmsg_acpi_cst *)msg;
1057c241507cSSepherosa Ziehau     int error;
1058c241507cSSepherosa Ziehau 
1059c241507cSSepherosa Ziehau     error = acpi_cpu_set_cx_lowest_oncpu(rmsg->sc, rmsg->val);
1060c241507cSSepherosa Ziehau     lwkt_replymsg(&rmsg->base.lmsg, error);
1061c241507cSSepherosa Ziehau }
1062c241507cSSepherosa Ziehau 
1063c241507cSSepherosa Ziehau static int
10644eee58faSSepherosa Ziehau acpi_cpu_set_cx_lowest(struct acpi_cst_softc *sc, int val)
1065c241507cSSepherosa Ziehau {
1066c241507cSSepherosa Ziehau     struct netmsg_acpi_cst msg;
1067c241507cSSepherosa Ziehau 
1068c241507cSSepherosa Ziehau     netmsg_init(&msg.base, NULL, &curthread->td_msgport, MSGF_PRIORITY,
1069c241507cSSepherosa Ziehau 	acpi_cst_set_lowest_handler);
1070c241507cSSepherosa Ziehau     msg.sc = sc;
1071c241507cSSepherosa Ziehau     msg.val = val;
1072c241507cSSepherosa Ziehau 
10734eee58faSSepherosa Ziehau     return lwkt_domsg(netisr_cpuport(sc->cst_cpuid), &msg.base.lmsg, 0);
1074c241507cSSepherosa Ziehau }
1075c241507cSSepherosa Ziehau 
10765db2f26eSSascha Wildner static int
10775db2f26eSSascha Wildner acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS)
10785db2f26eSSascha Wildner {
10794eee58faSSepherosa Ziehau     struct	 acpi_cst_softc *sc;
10805db2f26eSSascha Wildner     char	 state[8];
10815db2f26eSSascha Wildner     int		 val, error;
10825db2f26eSSascha Wildner 
10834eee58faSSepherosa Ziehau     sc = (struct acpi_cst_softc *)arg1;
10844eee58faSSepherosa Ziehau     ksnprintf(state, sizeof(state), "C%d", sc->cst_cx_lowest_req + 1);
10855db2f26eSSascha Wildner     error = sysctl_handle_string(oidp, state, sizeof(state), req);
10865db2f26eSSascha Wildner     if (error != 0 || req->newptr == NULL)
10875db2f26eSSascha Wildner 	return (error);
10885db2f26eSSascha Wildner     if (strlen(state) < 2 || toupper(state[0]) != 'C')
10895db2f26eSSascha Wildner 	return (EINVAL);
10905db2f26eSSascha Wildner     val = (int) strtol(state + 1, NULL, 10) - 1;
10911d730338SSepherosa Ziehau     if (val < 0)
10925db2f26eSSascha Wildner 	return (EINVAL);
10935db2f26eSSascha Wildner 
1094b45624acSSepherosa Ziehau     lwkt_serialize_enter(&cpu_cx_slize);
10955db2f26eSSascha Wildner     error = acpi_cpu_set_cx_lowest(sc, val);
1096b45624acSSepherosa Ziehau     lwkt_serialize_exit(&cpu_cx_slize);
10975db2f26eSSascha Wildner 
10985db2f26eSSascha Wildner     return error;
10995db2f26eSSascha Wildner }
11005db2f26eSSascha Wildner 
11015db2f26eSSascha Wildner static int
11021d730338SSepherosa Ziehau acpi_cpu_cx_lowest_use_sysctl(SYSCTL_HANDLER_ARGS)
11031d730338SSepherosa Ziehau {
11044eee58faSSepherosa Ziehau     struct	 acpi_cst_softc *sc;
11051d730338SSepherosa Ziehau     char	 state[8];
11061d730338SSepherosa Ziehau 
11074eee58faSSepherosa Ziehau     sc = (struct acpi_cst_softc *)arg1;
11084eee58faSSepherosa Ziehau     ksnprintf(state, sizeof(state), "C%d", sc->cst_cx_lowest + 1);
11091d730338SSepherosa Ziehau     return sysctl_handle_string(oidp, state, sizeof(state), req);
11101d730338SSepherosa Ziehau }
11111d730338SSepherosa Ziehau 
11121d730338SSepherosa Ziehau static int
11135db2f26eSSascha Wildner acpi_cpu_global_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS)
11145db2f26eSSascha Wildner {
11154eee58faSSepherosa Ziehau     struct	acpi_cst_softc *sc;
11165db2f26eSSascha Wildner     char	state[8];
11175db2f26eSSascha Wildner     int		val, error, i;
11185db2f26eSSascha Wildner 
11191d730338SSepherosa Ziehau     ksnprintf(state, sizeof(state), "C%d", cpu_cx_lowest_req + 1);
11205db2f26eSSascha Wildner     error = sysctl_handle_string(oidp, state, sizeof(state), req);
11215db2f26eSSascha Wildner     if (error != 0 || req->newptr == NULL)
11225db2f26eSSascha Wildner 	return (error);
11235db2f26eSSascha Wildner     if (strlen(state) < 2 || toupper(state[0]) != 'C')
11245db2f26eSSascha Wildner 	return (EINVAL);
11255db2f26eSSascha Wildner     val = (int) strtol(state + 1, NULL, 10) - 1;
11261d730338SSepherosa Ziehau     if (val < 0)
11275db2f26eSSascha Wildner 	return (EINVAL);
11281d730338SSepherosa Ziehau 
1129b45624acSSepherosa Ziehau     lwkt_serialize_enter(&cpu_cx_slize);
1130b45624acSSepherosa Ziehau 
11311d730338SSepherosa Ziehau     cpu_cx_lowest_req = val;
11325db2f26eSSascha Wildner     cpu_cx_lowest = val;
11331d730338SSepherosa Ziehau     if (cpu_cx_lowest > cpu_cx_count - 1)
11341d730338SSepherosa Ziehau 	cpu_cx_lowest = cpu_cx_count - 1;
11355db2f26eSSascha Wildner 
11365db2f26eSSascha Wildner     /* Update the new lowest useable Cx state for all CPUs. */
11375db2f26eSSascha Wildner     for (i = 0; i < cpu_ndevices; i++) {
11385db2f26eSSascha Wildner 	sc = device_get_softc(cpu_devices[i]);
11395db2f26eSSascha Wildner 	error = acpi_cpu_set_cx_lowest(sc, val);
11405db2f26eSSascha Wildner 	if (error) {
11415db2f26eSSascha Wildner 	    KKASSERT(i == 0);
11425db2f26eSSascha Wildner 	    break;
11435db2f26eSSascha Wildner 	}
11445db2f26eSSascha Wildner     }
1145b45624acSSepherosa Ziehau 
1146b45624acSSepherosa Ziehau     lwkt_serialize_exit(&cpu_cx_slize);
11475db2f26eSSascha Wildner 
11485db2f26eSSascha Wildner     return error;
11495db2f26eSSascha Wildner }
11505db2f26eSSascha Wildner 
11511d730338SSepherosa Ziehau static int
11521d730338SSepherosa Ziehau acpi_cpu_global_cx_lowest_use_sysctl(SYSCTL_HANDLER_ARGS)
11531d730338SSepherosa Ziehau {
11541d730338SSepherosa Ziehau     char	state[8];
11551d730338SSepherosa Ziehau 
11561d730338SSepherosa Ziehau     ksnprintf(state, sizeof(state), "C%d", cpu_cx_lowest + 1);
11571d730338SSepherosa Ziehau     return sysctl_handle_string(oidp, state, sizeof(state), req);
11581d730338SSepherosa Ziehau }
11591d730338SSepherosa Ziehau 
11605db2f26eSSascha Wildner /*
11615db2f26eSSascha Wildner  * Put the CPU in C1 in a machine-dependant way.
11625db2f26eSSascha Wildner  * XXX: shouldn't be here!
11635db2f26eSSascha Wildner  */
11645db2f26eSSascha Wildner static void
11655db2f26eSSascha Wildner acpi_cpu_c1(void)
11665db2f26eSSascha Wildner {
11675db2f26eSSascha Wildner #ifdef __ia64__
11685db2f26eSSascha Wildner     ia64_call_pal_static(PAL_HALT_LIGHT, 0, 0, 0);
11695db2f26eSSascha Wildner #else
11705db2f26eSSascha Wildner     splz();
11715db2f26eSSascha Wildner     if ((mycpu->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0)
11725db2f26eSSascha Wildner         __asm __volatile("sti; hlt");
11735db2f26eSSascha Wildner     else
11745db2f26eSSascha Wildner         __asm __volatile("sti; pause");
11755db2f26eSSascha Wildner #endif /* !__ia64__ */
11765db2f26eSSascha Wildner }
1177febc8c49SSepherosa Ziehau 
1178febc8c49SSepherosa Ziehau static void
11794eee58faSSepherosa Ziehau acpi_cpu_cx_non_c3(struct acpi_cst_softc *sc)
1180febc8c49SSepherosa Ziehau {
1181febc8c49SSepherosa Ziehau     int i;
1182febc8c49SSepherosa Ziehau 
11834eee58faSSepherosa Ziehau     sc->cst_non_c3 = 0;
11844eee58faSSepherosa Ziehau     for (i = sc->cst_cx_lowest; i >= 0; i--) {
11854eee58faSSepherosa Ziehau 	if (sc->cst_cx_states[i].type < ACPI_STATE_C3) {
11864eee58faSSepherosa Ziehau 	    sc->cst_non_c3 = i;
1187febc8c49SSepherosa Ziehau 	    break;
1188febc8c49SSepherosa Ziehau 	}
1189febc8c49SSepherosa Ziehau     }
1190febc8c49SSepherosa Ziehau     if (bootverbose)
11914eee58faSSepherosa Ziehau 	device_printf(sc->cst_dev, "non-C3 %d\n", sc->cst_non_c3);
1192febc8c49SSepherosa Ziehau }
11934cf48621SSepherosa Ziehau 
11944cf48621SSepherosa Ziehau /*
11954cf48621SSepherosa Ziehau  * Update the largest Cx state supported in the global cpu_cx_count.
11964cf48621SSepherosa Ziehau  * It will be used in the global Cx sysctl handler.
11974cf48621SSepherosa Ziehau  */
11984cf48621SSepherosa Ziehau static void
11994cf48621SSepherosa Ziehau acpi_cpu_global_cx_count(void)
12004cf48621SSepherosa Ziehau {
12014eee58faSSepherosa Ziehau     struct acpi_cst_softc *sc;
12024cf48621SSepherosa Ziehau     int i;
12034cf48621SSepherosa Ziehau 
12044cf48621SSepherosa Ziehau     if (cpu_ndevices == 0) {
12054cf48621SSepherosa Ziehau 	cpu_cx_count = 0;
12064cf48621SSepherosa Ziehau 	return;
12074cf48621SSepherosa Ziehau     }
12084cf48621SSepherosa Ziehau 
12094cf48621SSepherosa Ziehau     sc = device_get_softc(cpu_devices[0]);
12104eee58faSSepherosa Ziehau     cpu_cx_count = sc->cst_cx_count;
12114cf48621SSepherosa Ziehau 
12124cf48621SSepherosa Ziehau     for (i = 1; i < cpu_ndevices; i++) {
12134eee58faSSepherosa Ziehau 	struct acpi_cst_softc *sc = device_get_softc(cpu_devices[i]);
12144cf48621SSepherosa Ziehau 
12154eee58faSSepherosa Ziehau 	if (sc->cst_cx_count < cpu_cx_count)
12164eee58faSSepherosa Ziehau 	    cpu_cx_count = sc->cst_cx_count;
12174cf48621SSepherosa Ziehau     }
12184cf48621SSepherosa Ziehau     if (bootverbose)
12194cf48621SSepherosa Ziehau 	kprintf("cpu_cst: global Cx count %d\n", cpu_cx_count);
12204cf48621SSepherosa Ziehau }
1221