/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_CPUCAPS_IMPL_H
#define _SYS_CPUCAPS_IMPL_H

#ifdef  __cplusplus
extern "C" {
#endif

#ifdef _KERNEL

#include <sys/kstat.h>
#include <sys/cpucaps.h>
#include <sys/list.h>
#include <sys/time.h>
#include <sys/waitq.h>

/*
 * When resource control framework sets the cap to NOCAP value the cap
 * is disabled.
 */
#define NOCAP   MAXCAP

/*
 * Maximum value for the cap usage. Should be the maximum value for hrtime_t
 */
#if defined(_LP64)
#define MAX_USAGE LONG_MAX
#else
#define MAX_USAGE 9223372036854775807LL
#endif


/*
 * Most of the per-project or per-zone state related to CPU caps is kept in the
 * cpucap_t structure.
 */
typedef struct cpucap {
        list_node_t     cap_link;       /* next/prev capped entity      */
        struct kproject *cap_project;   /* project for the cap          */
        struct zone     *cap_zone;      /* zone for the cap             */
        waitq_t         cap_waitq;      /* waitq for capped threads     */
        kstat_t         *cap_kstat;     /* cpucaps specific kstat       */
        int64_t         cap_gen;        /* zone cap specific            */
        hrtime_t        cap_value;      /* scaled CPU usage cap         */
        hrtime_t        cap_usage;      /* current CPU usage            */
        disp_lock_t     cap_usagelock;  /* protects cap_usage above     */
        /*
         * Per cap statistics.
         */
        hrtime_t        cap_maxusage;   /* maximum cap usage            */
        u_longlong_t    cap_below;      /* # of ticks spend below the cap */
        u_longlong_t    cap_above;      /* # of ticks spend above the cap */
} cpucap_t;

/*
 * Wrapper macros for checking cap state.
 */
#define CAP_ENABLED(cap) ((cap)->cap_value != 0)
#define CAP_DISABLED(cap) (!CAP_ENABLED(cap))

#define PROJECT_IS_CAPPED(project) \
        (((project)->kpj_cpucap != NULL) && \
        CAP_ENABLED((project)->kpj_cpucap))

#define ZONE_IS_CAPPED(zone) \
        (((zone)->zone_cpucap != NULL) && \
        CAP_ENABLED((zone)->zone_cpucap))

#endif  /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_CPUCAPS_IMPL_H */