mp_call.c revision 11389:dd00b884e84f 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#include <sys/types.h>
28#include <sys/param.h>
29#include <sys/thread.h>
30#include <sys/cpuvar.h>
31#include <sys/machsystm.h>
32#include <sys/systm.h>
33#include <sys/promif.h>
34#include <sys/xc_levels.h>
35#include <sys/spl.h>
36#include <sys/bitmap.h>
37
38/*
39 * Interrupt another CPU.
40 * 	This is useful to make the other CPU go through a trap so that
41 *	it recognizes an address space trap (AST) for preempting a thread.
42 *
43 *	It is possible to be preempted here and be resumed on the CPU
44 *	being poked, so it isn't an error to poke the current CPU.
45 *	We could check this and still get preempted after the check, so
46 *	we don't bother.
47 */
48void
49poke_cpu(int cpun)
50{
51	if (panicstr)
52		return;
53	/*
54	 * We don't need to receive an ACK from the CPU being poked,
55	 * so just send out a directed interrupt.
56	 */
57	send_dirint(cpun, XC_CPUPOKE_PIL);
58}
59
60/*
61 * Call a function on a target CPU
62 */
63void
64cpu_call(cpu_t *cp, cpu_call_func_t func, uintptr_t arg1, uintptr_t arg2)
65{
66	cpuset_t set;
67
68	if (panicstr)
69		return;
70
71	/*
72	 * Prevent CPU from going off-line
73	 */
74	kpreempt_disable();
75
76	/*
77	 * If we are on the target CPU, call the function directly, but raise
78	 * the PIL to XC_PIL.
79	 * This guarantees that functions called via cpu_call() can not ever
80	 * interrupt each other.
81	 */
82	if (CPU == cp) {
83		int save_spl = splr(ipltospl(XC_HI_PIL));
84
85		(*func)(arg1, arg2);
86		splx(save_spl);
87	} else {
88		CPUSET_ONLY(set, cp->cpu_id);
89		xc_call((xc_arg_t)arg1, (xc_arg_t)arg2, 0, CPUSET2BV(set),
90		    (xc_func_t)func);
91	}
92	kpreempt_enable();
93}
94