modules/genunix/cpupart.c

/*
 * 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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"


#include <mdb/mdb_param.h>
#include <mdb/mdb_modapi.h>
#include <mdb/mdb_ks.h>

#include "lgrp.h"
#include "cpupart_mdb.h"

#include <sys/cpuvar.h>
#include <sys/cpupart.h>

/* ARGSUSED */
static int
cpupart_cpulist_callback(uintptr_t addr, const void *arg, void *cb_data)
{
    cpu_t *cpu = (cpu_t *)arg;

    ulong_t *cpuset = cb_data;

    BT_SET(cpuset, cpu->cpu_id);

    return (WALK_NEXT);
}

#define CPUPART_IDWIDTH     3

#ifdef _LP64
#define CPUPART_CPUWIDTH    21
#if defined(__amd64)
#define CPUPART_TWIDTH      16
#else
#define CPUPART_TWIDTH      11
#endif
#else
#define CPUPART_CPUWIDTH    13
#define CPUPART_TWIDTH      8
#endif


#define CPUPART_THRDELT     (CPUPART_IDWIDTH + CPUPART_CPUWIDTH)
#define CPUPART_INDENT      mdb_printf("%*s", CPUPART_THRDELT, "")

int
cpupart_disp_threads(disp_t *disp)
{
    dispq_t *dq;
    int i, npri = disp->disp_npri;
    proc_t p;
    kthread_t t;

    dq = mdb_alloc(sizeof (dispq_t) * npri, UM_SLEEP | UM_GC);

    if (mdb_vread(dq, sizeof (dispq_t) * npri,
        (uintptr_t)disp->disp_q) == -1) {
        mdb_warn("failed to read dispq_t at %p", disp->disp_q);
        return (DCMD_ERR);
    }

    CPUPART_INDENT;
    mdb_printf("|\n");
    CPUPART_INDENT;
    mdb_printf("+-->  %3s %-*s %s\n", "PRI", CPUPART_TWIDTH, "THREAD",
        "PROC");

    for (i = npri - 1; i >= 0; i--) {
        uintptr_t taddr = (uintptr_t)dq[i].dq_first;

        while (taddr != NULL) {
            if (mdb_vread(&t, sizeof (t), taddr) == -1) {
                mdb_warn("failed to read kthread_t at %p",
                    taddr);
                return (DCMD_ERR);
            }

            if (mdb_vread(&p, sizeof (p),
                (uintptr_t)t.t_procp) == -1) {
                mdb_warn("failed to read proc_t at %p",
                    t.t_procp);
                return (DCMD_ERR);
            }

            CPUPART_INDENT;
            mdb_printf("%9d %0*p %s\n", t.t_pri, CPUPART_TWIDTH,
                taddr, p.p_user.u_comm);

            taddr = (uintptr_t)t.t_link;
        }
    }

    return (DCMD_OK);
}

/* ARGSUSED */
int
cpupart(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
    cpupart_t cpupart;
    int cpusetsize;
    int _ncpu;
    ulong_t *cpuset;
    uint_t verbose = FALSE;

    if (mdb_getopts(argc, argv,
        'v', MDB_OPT_SETBITS, TRUE, &verbose, NULL) != argc)
        return (DCMD_USAGE);

    if (!(flags & DCMD_ADDRSPEC)) {
        if (mdb_walk_dcmd("cpupart_walk", "cpupart", argc, argv)
            == -1) {
            mdb_warn("can't walk 'cpupart'");
            return (DCMD_ERR);
        }
        return (DCMD_OK);
    }

    if (DCMD_HDRSPEC(flags)) {
        mdb_printf("%3s %?s %4s %4s %4s\n",
            "ID",
            "ADDR",
            "NRUN",
            "#CPU",
            "CPUS");
    }

    if (mdb_vread(&cpupart, sizeof (cpupart_t), addr) == -1) {
        mdb_warn("unable to read 'cpupart_t' at %p", addr);
        return (DCMD_ERR);
    }

    mdb_printf("%3d %?p %4d %4d ",
        cpupart.cp_id,
        addr,
        cpupart.cp_kp_queue.disp_nrunnable,
        cpupart.cp_ncpus);

    if (cpupart.cp_ncpus == 0) {
        mdb_printf("\n");
        return (DCMD_OK);
    }

    /*
     * figure out what cpus we've got
     */
    if (mdb_readsym(&_ncpu, sizeof (int), "_ncpu") == -1) {
        mdb_warn("symbol '_ncpu' not found");
        return (DCMD_ERR);
    }

    /*
     * allocate enough space for set of longs to hold cpuid bitfield
     */

    cpusetsize = BT_BITOUL(_ncpu) * sizeof (ulong_t);
    cpuset = mdb_zalloc(cpusetsize, UM_SLEEP | UM_GC);

    if (mdb_pwalk("cpupart_cpulist", cpupart_cpulist_callback, cpuset,
        addr) == -1) {
        mdb_warn("unable to walk cpupart_cpulist");
        return (DCMD_ERR);
    }

    print_cpuset_range(cpuset, cpusetsize/sizeof (ulong_t), 0);

    mdb_printf("\n");
    /*
     * If there are any threads on kp queue and -v is specified
     */
    if (verbose && cpupart.cp_kp_queue.disp_nrunnable) {
        if (cpupart_disp_threads(&cpupart.cp_kp_queue) != DCMD_OK)
            return (DCMD_ERR);
    }

    return (DCMD_OK);
}

typedef struct cpupart_cpulist_walk {
    uintptr_t   ccw_firstcpu;
    int         ccw_cpusleft;
} cpupart_cpulist_walk_t;

int
cpupart_cpulist_walk_init(mdb_walk_state_t *wsp)
{
    cpupart_cpulist_walk_t *ccw;
    cpupart_t cpupart;

    ccw = mdb_alloc(sizeof (cpupart_cpulist_walk_t), UM_SLEEP | UM_GC);

    if (mdb_vread(&cpupart, sizeof (cpupart_t), wsp->walk_addr) == -1) {
        mdb_warn("couldn't read 'cpupart' at %p", wsp->walk_addr);
        return (WALK_ERR);
    }

    ccw->ccw_firstcpu = (uintptr_t)cpupart.cp_cpulist;
    ccw->ccw_cpusleft = cpupart.cp_ncpus;

    wsp->walk_data = ccw;
    wsp->walk_addr = ccw->ccw_firstcpu;

    return (WALK_NEXT);
}

int
cpupart_cpulist_walk_step(mdb_walk_state_t *wsp)
{
    cpupart_cpulist_walk_t *ccw = (cpupart_cpulist_walk_t *)
        wsp->walk_data;
    uintptr_t addr = wsp->walk_addr;
    cpu_t cpu;
    int status;

    if (mdb_vread(&cpu, sizeof (cpu_t), addr) == -1) {
        mdb_warn("couldn't read 'cpupart' at %p", addr);
        return (WALK_ERR);
    }

    status = wsp->walk_callback(addr, &cpu, wsp->walk_cbdata);

    if (status != WALK_NEXT)
        return (status);

    addr = (uintptr_t)cpu.cpu_next_part;
    wsp->walk_addr = addr;

    ccw->ccw_cpusleft--;

    if (ccw->ccw_cpusleft < 0) {
        mdb_warn("cpu count doesn't match cpupart list");
        return (WALK_ERR);
    }

    if (ccw->ccw_firstcpu == addr) {
        if (ccw->ccw_cpusleft != 0) {
            mdb_warn("cpu count doesn't match cpupart list");
            return (WALK_ERR);
        }
        return (WALK_DONE);
    }

    return (WALK_NEXT);
}

int
cpupart_walk_init(mdb_walk_state_t *wsp)
{
    GElf_Sym sym;
    uintptr_t addr;

    if (mdb_lookup_by_name("cp_default", &sym) == -1) {
        mdb_warn("failed to find 'cp_default'\n");
        return (WALK_ERR);
    }

    addr = (uintptr_t)sym.st_value;
    wsp->walk_data = (void *)addr;
    wsp->walk_addr = addr;

    return (WALK_NEXT);
}

int
cpupart_walk_step(mdb_walk_state_t *wsp)
{
    cpupart_t cpupart;
    int status;

    if (mdb_vread(&cpupart, sizeof (cpupart_t),
        wsp->walk_addr) == -1) {
        mdb_warn("unable to read cpupart at %p",
            wsp->walk_addr);
        return (WALK_ERR);
    }

    status = wsp->walk_callback(wsp->walk_addr, &cpupart,
        wsp->walk_cbdata);

    if (status != WALK_NEXT)
        return (status);

    wsp->walk_addr = (uintptr_t)cpupart.cp_next;

    if (wsp->walk_addr == (uintptr_t)wsp->walk_data)
        return (WALK_DONE);

    return (WALK_NEXT);

}