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 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26 /*
27 * Copyright 2015, Joyent, Inc.
28 */
29
30 #include <sys/cpuvar.h>
31 #include <sys/stack.h>
32 #include <vm/seg_kp.h>
33 #include <sys/machparam.h>
34 #include <sys/proc.h>
35 #include <sys/pset.h>
36 #include <sys/sysmacros.h>
37
38 /*
39 * Create and initialize an interrupt thread.
40 */
41 static void
thread_create_intr(cpu_t * cp)42 thread_create_intr(cpu_t *cp)
43 {
44 kthread_t *tp;
45
46 tp = thread_create(NULL, LL_INTR_STKSZ,
47 (void (*)())thread_create_intr, NULL, 0, &p0, TS_ONPROC, 0);
48
49 /*
50 * Set the thread in the TS_FREE state. The state will change
51 * to TS_ONPROC only while the interrupt is active. Think of these
52 * as being on a private free list for the CPU. Being TS_FREE keeps
53 * inactive interrupt threads out of debugger thread lists.
54 *
55 * We cannot call thread_create with TS_FREE because of the current
56 * checks there for ONPROC. Fix this when thread_create takes flags.
57 */
58 THREAD_FREEINTR(tp, cp);
59
60 /*
61 * Nobody should ever reference the credentials of an interrupt
62 * thread so make it NULL to catch any such references.
63 */
64 tp->t_cred = NULL;
65 tp->t_flag |= T_INTR_THREAD;
66 tp->t_cpu = cp;
67 tp->t_bound_cpu = cp;
68 tp->t_disp_queue = cp->cpu_disp;
69 tp->t_affinitycnt = 1;
70 tp->t_preempt = 1;
71
72 /*
73 * Don't make a user-requested binding on this thread so that
74 * the processor can be offlined.
75 */
76 tp->t_bind_cpu = PBIND_NONE; /* no USER-requested binding */
77 tp->t_bind_pset = PS_NONE;
78
79 #if defined(__x86)
80 tp->t_stk -= STACK_ALIGN;
81 *(tp->t_stk) = 0; /* terminate intr thread stack */
82 #endif
83
84 /*
85 * Link onto CPU's interrupt pool.
86 */
87 tp->t_link = cp->cpu_intr_thread;
88 cp->cpu_intr_thread = tp;
89 }
90
91 /*
92 * Allocate a given number of interrupt threads for a given CPU. These threads
93 * will get freed by cpu_destroy_bound_threads() when the CPU gets unconfigured.
94 *
95 * Note, high level interrupts are always serviced using cpu_intr_stack and are
96 * not allowed to block. Low level interrupts or soft-interrupts use the
97 * kthread_t's that we create through the calls to thread_create_intr().
98 */
99 void
cpu_intr_alloc(cpu_t * cp,int n)100 cpu_intr_alloc(cpu_t *cp, int n)
101 {
102 int i;
103
104 for (i = 0; i < n; i++)
105 thread_create_intr(cp);
106
107 cp->cpu_intr_stack = (caddr_t)segkp_get(segkp, INTR_STACK_SIZE,
108 KPD_HASREDZONE | KPD_NO_ANON | KPD_LOCKED) +
109 INTR_STACK_SIZE - SA(MINFRAME);
110 }
111