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Annotation of sys/arch/amd64/amd64/ipi.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: ipi.c,v 1.7 2007/05/25 16:22:11 art Exp $     */
                      2: /*     $NetBSD: ipi.c,v 1.2 2003/03/01 13:05:37 fvdl Exp $     */
                      3:
                      4: /*-
                      5:  * Copyright (c) 2000 The NetBSD Foundation, Inc.
                      6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to The NetBSD Foundation
                      9:  * by RedBack Networks Inc.
                     10:  *
                     11:  * Author: Bill Sommerfeld
                     12:  *
                     13:  * Redistribution and use in source and binary forms, with or without
                     14:  * modification, are permitted provided that the following conditions
                     15:  * are met:
                     16:  * 1. Redistributions of source code must retain the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer.
                     18:  * 2. Redistributions in binary form must reproduce the above copyright
                     19:  *    notice, this list of conditions and the following disclaimer in the
                     20:  *    documentation and/or other materials provided with the distribution.
                     21:  * 3. All advertising materials mentioning features or use of this software
                     22:  *    must display the following acknowledgement:
                     23:  *        This product includes software developed by the NetBSD
                     24:  *        Foundation, Inc. and its contributors.
                     25:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     26:  *    contributors may be used to endorse or promote products derived
                     27:  *    from this software without specific prior written permission.
                     28:  *
                     29:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     30:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     31:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     32:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     33:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     34:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     35:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     36:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     37:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     38:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     39:  * POSSIBILITY OF SUCH DAMAGE.
                     40:  */
                     41:
                     42: #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
                     43:
                     44: #include <sys/param.h>
                     45: #include <sys/device.h>
                     46: #include <sys/systm.h>
                     47:
                     48: #include <machine/intr.h>
                     49: #include <machine/atomic.h>
                     50: #include <machine/cpuvar.h>
                     51: #include <machine/i82093var.h>
                     52: #include <machine/i82489reg.h>
                     53: #include <machine/i82489var.h>
                     54:
                     55: int
                     56: x86_send_ipi(struct cpu_info *ci, int ipimask)
                     57: {
                     58:        int ret;
                     59:
                     60:        x86_atomic_setbits_l(&ci->ci_ipis, ipimask);
                     61:
                     62:        /* Don't send IPI to cpu which isn't (yet) running. */
                     63:        if (!(ci->ci_flags & CPUF_RUNNING))
                     64:                return ENOENT;
                     65:
                     66:        ret = x86_ipi(LAPIC_IPI_VECTOR, ci->ci_apicid, LAPIC_DLMODE_FIXED);
                     67:        if (ret != 0) {
                     68:                printf("ipi of %x from %s to %s failed\n",
                     69:                    ipimask,
                     70:                    curcpu()->ci_dev->dv_xname,
                     71:                    ci->ci_dev->dv_xname);
                     72:        }
                     73:
                     74:        return ret;
                     75: }
                     76:
                     77: int
                     78: x86_fast_ipi(struct cpu_info *ci, int ipi)
                     79: {
                     80:        if (!(ci->ci_flags & CPUF_RUNNING))
                     81:                return (ENOENT);
                     82:
                     83:        return (x86_ipi(ipi, ci->ci_apicid, LAPIC_DLMODE_FIXED));
                     84: }
                     85:
                     86: void
                     87: x86_broadcast_ipi(int ipimask)
                     88: {
                     89:        struct cpu_info *ci, *self = curcpu();
                     90:        int count = 0;
                     91:        CPU_INFO_ITERATOR cii;
                     92:
                     93:        CPU_INFO_FOREACH(cii, ci) {
                     94:                if (ci == self)
                     95:                        continue;
                     96:                if ((ci->ci_flags & CPUF_RUNNING) == 0)
                     97:                        continue;
                     98:                x86_atomic_setbits_l(&ci->ci_ipis, ipimask);
                     99:                count++;
                    100:        }
                    101:        if (!count)
                    102:                return;
                    103:
                    104:        x86_ipi(LAPIC_IPI_VECTOR, LAPIC_DEST_ALLEXCL, LAPIC_DLMODE_FIXED);
                    105: }
                    106:
                    107: void
                    108: x86_multicast_ipi(int cpumask, int ipimask)
                    109: {
                    110:        struct cpu_info *ci;
                    111:        CPU_INFO_ITERATOR cii;
                    112:
                    113:        cpumask &= ~(1U << cpu_number());
                    114:        if (cpumask == 0)
                    115:                return;
                    116:
                    117:        CPU_INFO_FOREACH(cii, ci) {
                    118:                if ((cpumask & (1U << ci->ci_cpuid)) == 0)
                    119:                        continue;
                    120:                x86_send_ipi(ci, ipimask);
                    121:        }
                    122: }
                    123:
                    124: void
                    125: x86_ipi_handler(void)
                    126: {
                    127:        extern struct evcount ipi_count;
                    128:        struct cpu_info *ci = curcpu();
                    129:        u_int32_t pending;
                    130:        int bit;
                    131:
                    132:        pending = x86_atomic_testset_ul(&ci->ci_ipis, 0);
                    133:
                    134:        for (bit = 0; bit < X86_NIPI && pending; bit++) {
                    135:                if (pending & (1<<bit)) {
                    136:                        pending &= ~(1<<bit);
                    137:                        (*ipifunc[bit])(ci);
                    138:                        ipi_count.ec_count++;
                    139:                }
                    140:        }
                    141: }