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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1999-2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_US_DRV_H
#define _SYS_US_DRV_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/promif.h>
#include <sys/cpuvar.h>
#include <sys/taskq.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifdef _KERNEL
/*
* UltraSPARC CPU power management data
*/
/*
* Data related to a particular speed.
*
* All per speed data nodes for a CPU are linked together using down_spd.
* The link list is ordered with first node containing data for
* normal (maximum) speed. up_spd points to the next speed up. Currently
* all up_spd's point to the normal speed but this can be changed in future.
* quant_cnt is the number of ticks when monitoring system will be called
* next. There are different quant_cnt for different speeds.
*/
typedef struct us_pm_spd {
uint_t divisor; /* speed divisor */
uint_t quant_cnt; /* quantum count in ticks */
struct us_pm_spd *down_spd; /* ptr to next speed down */
struct us_pm_spd *up_spd; /* ptr to next speed up */
uint_t idle_hwm; /* down if idle thread >= hwm */
uint_t idle_lwm; /* up if idle thread < lwm */
uint_t idle_bhwm_cnt; /* # of iters idle is < hwm */
uint_t idle_blwm_cnt; /* # of iters idle is < lwm */
uint_t user_hwm; /* up if user thread > hwm */
int user_lwm; /* down if user thread <= lwm */
int pm_level; /* power level for framework */
} us_pm_spd_t;
/*
* Power management data
*/
typedef struct us_pm {
us_pm_spd_t *head_spd; /* ptr to head of speed */
us_pm_spd_t *cur_spd; /* ptr to current speed */
us_pm_spd_t *targ_spd; /* target speed when cur_spd */
/* is unknown (i.e. NULL) */
uint_t num_spd; /* number of speeds */
uint_t lastquan_idle; /* last quantum's CPU_IDLE timestamp */
uint_t lastquan_user; /* last quantum's CPU_USER timestamp */
clock_t lastquan_lbolt; /* last quantum's lbolt */
int pm_busycnt; /* pm_busy_component() count */
taskq_t *tq; /* taskq handler for CPU monitor */
timeout_id_t timeout_id; /* us_pm_monitor()'s timeout_id */
int timeout_count; /* count dispatched timeouts */
kmutex_t timeout_lock; /* protect timeout_count */
kcondvar_t timeout_cv; /* wait on timeout_count change */
} us_pm_t;
/*
* Idle & user threads water marks in percentage
*/
#define US_PM_IDLE_LWM 8 /* idle low water mark */
#define US_PM_IDLE_HWM 98 /* idle high water mark */
#define US_PM_USER_HWM 20 /* user high water mark */
#define US_PM_IDLE_BUF_ZONE 4 /* buffer zone when going down */
#define US_PM_IDLE_BLWM_CNT_MAX 2 /* # of iters idle can be < lwm */
#define US_PM_IDLE_BHWM_CNT_MAX 2 /* # of iters idle can be < hwm */
/*
* Maximums for creating 'pm-components' property
*/
#define US_PM_COMP_MAX_DIG 4 /* max digits in power level */
/* or divisor */
#define US_PM_COMP_MAX_VAL 9999 /* max value in above digits */
/*
* Component number for calls to PM framework
*/
#define US_PM_COMP_NUM 0 /* first component is 0 */
/*
* Quantum counts for normal and other clock speeds in terms of ticks.
*
* In determining the quantum count, we need to balance two opposing factors:
*
* 1) Minimal delay when user start using the CPU that is in low
* power mode -- requires that we monitor more frequently,
*
* 2) Extra code executed because of frequent monitoring -- requires
* that we monitor less frequently.
*
* We reach a tradeoff between these two requirements by monitoring
* more frequently when we are in low speed mode (US_PM_QUANT_CNT_OTHR)
* so we can bring the CPU up without user noticing it. Moreover, at low
* speed we are not using CPU much so extra code execution should be fine.
* Since we are in no hurry to bring CPU down and at normal speed and we
* might really be using the CPU fully, we monitor less frequently
* (US_PM_QUANT_CNT_NORMAL).
*/
#define US_PM_QUANT_CNT_NORMAL (hz * 5) /* 5 sec */
#define US_PM_QUANT_CNT_OTHR (hz * 1) /* 1 sec */
/*
* Taskq parameters
*/
#define US_PM_TASKQ_THREADS 1 /* # threads to run CPU monitor */
#define US_PM_TASKQ_MIN 2 /* min # of taskq entries */
#define US_PM_TASKQ_MAX 2 /* max # of taskq entries */
/*
* Device driver state structure
*/
typedef struct us_devstate {
dev_info_t *dip; /* devinfo handle */
processorid_t cpu_id; /* CPU number for this node */
us_pm_t us_pm; /* power management data */
kmutex_t lock; /* protects state struct */
} us_devstate_t;
/*
* Debugging definitions
*/
#ifdef DEBUG
#define D_INIT 0x00000001
#define D_FINI 0x00000002
#define D_ATTACH 0x00000004
#define D_DETACH 0x00000008
#define D_POWER 0x00000010
#define D_PM_INIT 0x00000020
#define D_PM_FREE 0x00000040
#define D_PM_COMP_CREATE 0x00000080
#define D_PM_MONITOR 0x00000100
#define D_PM_MONITOR_VERBOSE 0x00000200
#define D_PM_MONITOR_DELAY 0x00000400
extern uint_t us_drv_debug;
#define _PRINTF prom_printf
#define DPRINTF(flag, args) if (us_drv_debug & flag) _PRINTF args;
#else
#define DPRINTF(flag, args)
#endif /* DEBUG */
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_US_DRV_H */
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