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Annotation of XNU/osfmk/kern/sf.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  * 
        !            25:  */
        !            26: 
        !            27: #include <kern/misc_protos.h>
        !            28: #include <kern/sf.h>
        !            29: #include <kern/processor.h>
        !            30: #include <kern/mk_sp.h>
        !            31: #include <mach/policy.h>
        !            32: 
        !            33: /*
        !            34:  * Procedure Prototypes
        !            35:  */
        !            36: 
        !            37: void           sf_update_max_sizes(
        !            38:                        sp_info_size_t          info_size,
        !            39:                        sp_attributes_size_t    attributes_size);
        !            40: 
        !            41: /*
        !            42:  * The array of scheduling policies supported by the Scheduling Framework.
        !            43:  */
        !            44: 
        !            45: sched_policy_t sched_policy[MAX_SCHED_POLS];
        !            46: 
        !            47: /*
        !            48:  * Maximum sizes for scheduling-policy-specific information and 
        !            49:  * attributes, calculated dynamically based on the scheduling
        !            50:  * policies that are initialized at system startup time.
        !            51:  */
        !            52: sp_info_size_t         max_sched_info_size = 0;
        !            53: sp_attributes_size_t   max_sched_attributes_size = 0;
        !            54: 
        !            55: void
        !            56: sf_init(void)
        !            57: {
        !            58:        int                     i;
        !            59:        sf_return_t             sfr;
        !            60:        sf_priority_mask        pri_mask;
        !            61:        processor_t             myprocessor;
        !            62:        processor_set_t         pset;
        !            63:        extern struct processor_set     default_pset;
        !            64: 
        !            65:        /* initialize scheduling framework */
        !            66:        /*** XXX should this be done once for each node? ***/
        !            67: 
        !            68:        /*
        !            69:         * Initialize scheduling policies.  Each policy has its
        !            70:         * standard operation vector initialized and then has a
        !            71:         * routine called to initialize its internal state.
        !            72:         */
        !            73:        /*** XXX should this be moved to `sched_init()' -- or it to here? ***/
        !            74:        /*** XXX should this be done once for each CPU? ***/
        !            75: 
        !            76:        /*
        !            77:         * Set up metapriority mask that will be used by the standard
        !            78:         * MK scheduling policies.
        !            79:         */
        !            80:        for (i=0; i < NRQS; i++) {
        !            81:                setbit(i, pri_mask.bitmap);
        !            82:        }
        !            83:        clrbit(MAXPRI - LPRI + 1, pri_mask.bitmap);
        !            84:        clrbit(MAXPRI - LPRI, pri_mask.bitmap);
        !            85: 
        !            86:        /* Initialize standard MK Timesharing policy */
        !            87:        sched_policy[POLICY_TIMESHARE].sp_ops = mk_sp_ops;
        !            88:        sfr = sched_policy[POLICY_TIMESHARE].
        !            89:                sp_ops.sp_init(
        !            90:                        &sched_policy[POLICY_TIMESHARE], POLICY_TIMESHARE,
        !            91:                                sizeof(sf_priority_mask), &pri_mask);
        !            92:        if (sfr != SF_SUCCESS) {
        !            93:                printf("TIMESHARE failed to init: %d\n", sfr);
        !            94:                panic("sf_init");
        !            95:        }
        !            96: 
        !            97:        sf_update_max_sizes(sched_policy[POLICY_TIMESHARE].sched_info_size,
        !            98:                            sched_policy[POLICY_TIMESHARE].sched_attributes_size);
        !            99: 
        !           100:        /* Initialize standard MK Round Robin policy */
        !           101:        sched_policy[POLICY_RR].sp_ops = mk_sp_ops;
        !           102:        sfr = sched_policy[POLICY_RR].
        !           103:                sp_ops.sp_init(
        !           104:                        &sched_policy[POLICY_RR], POLICY_RR,
        !           105:                                sizeof(sf_priority_mask), &pri_mask);
        !           106:        if (sfr != SF_SUCCESS) {
        !           107:                printf("RR failed to init: %d\n", sfr);
        !           108:                panic("sf_init");
        !           109:        }
        !           110: 
        !           111:        sf_update_max_sizes(sched_policy[POLICY_RR].sched_info_size,
        !           112:                            sched_policy[POLICY_RR].sched_attributes_size);
        !           113: 
        !           114:        /* Initialize standard MK FIFO policy */
        !           115:        sched_policy[POLICY_FIFO].sp_ops = mk_sp_ops;
        !           116:        sfr = sched_policy[POLICY_FIFO].
        !           117:                sp_ops.sp_init(
        !           118:                        &sched_policy[POLICY_FIFO], POLICY_FIFO,
        !           119:                                sizeof(sf_priority_mask), &pri_mask);
        !           120:        if (sfr != SF_SUCCESS) {
        !           121:                printf("FIFO failed to init: %d\n", sfr);
        !           122:                panic("sf_init");
        !           123:        }
        !           124: 
        !           125:        sf_update_max_sizes(sched_policy[POLICY_FIFO].sched_info_size,
        !           126:                            sched_policy[POLICY_FIFO].sched_attributes_size);
        !           127: 
        !           128:        /* Enable the MK Timesharing policy on the current processor set */
        !           129:        myprocessor = cpu_to_processor(cpu_number());
        !           130:        pset = myprocessor->processor_set;
        !           131:        /*** XXX fix me ***/
        !           132:        if (pset == PROCESSOR_SET_NULL)
        !           133:                pset = &default_pset;
        !           134: 
        !           135:        sched_policy[POLICY_TIMESHARE].
        !           136:            sp_ops.sp_enable_processor_set(
        !           137:                        &sched_policy[POLICY_TIMESHARE], pset);
        !           138: }
        !           139: 
        !           140: void
        !           141: sf_update_max_sizes(
        !           142:        sp_info_size_t          info_size,
        !           143:        sp_attributes_size_t    attributes_size)
        !           144: {
        !           145:        /* Update maximum values (individually) based on new sizes */
        !           146:        if (info_size > max_sched_info_size)
        !           147:                max_sched_info_size = info_size;
        !           148:        if (attributes_size > max_sched_attributes_size)
        !           149:                max_sched_attributes_size = attributes_size;
        !           150: }

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