/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright 2019 Peter Tribble.
 */

#include <sys/machsystm.h>
#include <sys/cpu_module.h>
#include <sys/dtrace.h>
#include <sys/cpu_sgnblk_defs.h>

/*
 * Useful for disabling MP bring-up for an MP capable kernel
 * (a kernel that was built with MP defined)
 */
int use_mp = 1;                 /* set to come up mp */

/*
 * Init CPU info - get CPU type info for processor_info system call.
 */
void
init_cpu_info(struct cpu *cp)
{
        processor_info_t *pi = &cp->cpu_type_info;
        int cpuid = cp->cpu_id;
        struct cpu_node *cpunode = &cpunodes[cpuid];

        cp->cpu_fpowner = NULL;         /* not used for V9 */

        /*
         * Get clock-frequency property from cpunodes[] for the CPU.
         */
        pi->pi_clock = (cpunode->clock_freq + 500000) / 1000000;

        /*
         * Current frequency in Hz.
         */
        cp->cpu_curr_clock = cpunode->clock_freq;

        /*
         * Supported frequencies.
         */
        cpu_set_supp_freqs(cp, NULL);

        (void) strcpy(pi->pi_processor_type, "sparcv9");
        (void) strcpy(pi->pi_fputypes, "sparcv9");

        if (cpuid == cpu0.cpu_id) {
                /*
                 * cpu0 starts out running.  Other cpus are
                 * still in OBP land and we will leave them
                 * alone for now.
                 */
                CPU_SIGNATURE(OS_SIG, SIGST_RUN, SIGSUBST_NULL, cpuid);
#ifdef  lint
                cpuid = cpuid;
#endif  /* lint */
        }
}

/*
 * Routine used to cleanup a CPU that has been powered off.  This will
 * destroy all per-cpu information related to this cpu.
 */
int
mp_cpu_unconfigure(int cpuid)
{
        int retval;
        void empty_cpu(int);
        extern int cleanup_cpu_common(int);

        ASSERT(MUTEX_HELD(&cpu_lock));

        retval = cleanup_cpu_common(cpuid);

        empty_cpu(cpuid);

        return (retval);
}

struct mp_find_cpu_arg {
        int cpuid;              /* set by mp_cpu_configure() */
        dev_info_t *dip;        /* set by mp_find_cpu() */
};

int
mp_find_cpu(dev_info_t *dip, void *arg)
{
        extern int get_portid_ddi(dev_info_t *, dev_info_t **);
        struct mp_find_cpu_arg *target = (struct mp_find_cpu_arg *)arg;
        char *type;
        int rv = DDI_WALK_CONTINUE;
        int cpuid;

        if (ddi_prop_lookup_string(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS,
            "device_type", &type))
                return (DDI_WALK_CONTINUE);

        if (strcmp(type, "cpu") != 0)
                goto out;

        cpuid = ddi_prop_get_int(DDI_DEV_T_ANY, dip,
            DDI_PROP_DONTPASS, "cpuid", -1);

        if (cpuid == -1)
                cpuid = get_portid_ddi(dip, NULL);
        if (cpuid != target->cpuid)
                goto out;

        /* Found it */
        rv = DDI_WALK_TERMINATE;
        target->dip = dip;

out:
        ddi_prop_free(type);
        return (rv);
}

/*
 * Routine used to setup a newly inserted CPU in preparation for starting
 * it running code.
 */
int
mp_cpu_configure(int cpuid)
{
        extern void fill_cpu_ddi(dev_info_t *);
        extern int setup_cpu_common(int);
        struct mp_find_cpu_arg target;

        ASSERT(MUTEX_HELD(&cpu_lock));

        target.dip = NULL;
        target.cpuid = cpuid;
        ddi_walk_devs(ddi_root_node(), mp_find_cpu, &target);

        if (target.dip == NULL)
                return (ENODEV);

        /*
         * Note:  uses cpu_lock to protect cpunodes and ncpunodes
         * which will be modified inside of fill_cpu_ddi().
         */
        fill_cpu_ddi(target.dip);

        /*
         * sun4v cpu setup may fail. sun4u assumes cpu setup to
         * be always successful, so the return value is ignored.
         */
        (void) setup_cpu_common(cpuid);

        return (0);
}

void
populate_idstr(struct cpu *cp)
{
        char buf[CPU_IDSTRLEN];
        struct cpu_node *cpunode;
        processor_info_t *pi;

        cpunode = &cpunodes[cp->cpu_id];
        pi = &cp->cpu_type_info;
        (void) snprintf(buf, sizeof (buf),
            "%s (portid %d impl 0x%x ver 0x%x clock %d MHz)",
            cpunode->name, cpunode->portid, cpunode->implementation,
            cpunode->version, pi->pi_clock);
        cp->cpu_idstr = kmem_alloc(strlen(buf) + 1, KM_SLEEP);
        (void) strcpy(cp->cpu_idstr, buf);

        cp->cpu_brandstr = kmem_alloc(strlen(cpunode->name) + 1, KM_SLEEP);
        (void) strcpy(cp->cpu_brandstr, cpunode->name);

        cmn_err(CE_CONT, "?cpu%d: %s\n", cp->cpu_id, cp->cpu_idstr);
}