usr/src/uts/common/disp/thread_intr.c

   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 /*
  28  * FILE NOTICE BEGIN
  29  *
  30  * This file should not be modified.  If you wish to modify it or have it
  31  * modified, please contact Sun Microsystems at <LFI149367@-sun-.-com->
  32  * (without anti-spam dashes)
  33  *
  34  * FILE NOTICE END
  35  */
  36
  37 #pragma ident   "%Z%%M% %I%     %E% SMI"
  38
  39 #include <sys/cpuvar.h>
  40 #include <sys/stack.h>
  41 #include <vm/seg_kp.h>
  42 #include <sys/proc.h>
  43 #include <sys/pset.h>
  44 #include <sys/sysmacros.h>
  45
  46 /*
  47  * Create and initialize an interrupt thread.
  48  */
  49 static void
  50 thread_create_intr(cpu_t *cp)
  51 {
  52         kthread_t *tp;
  53
  54         tp = thread_create(NULL, 0,
  55             (void (*)())thread_create_intr, NULL, 0, &p0, TS_ONPROC, 0);
  56
  57         /*
  58          * Set the thread in the TS_FREE state.  The state will change
  59          * to TS_ONPROC only while the interrupt is active.  Think of these
  60          * as being on a private free list for the CPU.  Being TS_FREE keeps
  61          * inactive interrupt threads out of debugger thread lists.
  62          *
  63          * We cannot call thread_create with TS_FREE because of the current
  64          * checks there for ONPROC.  Fix this when thread_create takes flags.
  65          */
  66         THREAD_FREEINTR(tp, cp);
  67
  68         /*
  69          * Nobody should ever reference the credentials of an interrupt
  70          * thread so make it NULL to catch any such references.
  71          */
  72         tp->t_cred = NULL;
  73         tp->t_flag |= T_INTR_THREAD;
  74         tp->t_cpu = cp;
  75         tp->t_bound_cpu = cp;
  76         tp->t_disp_queue = cp->cpu_disp;
  77         tp->t_affinitycnt = 1;
  78         tp->t_preempt = 1;
  79
  80         /*
  81          * Don't make a user-requested binding on this thread so that
  82          * the processor can be offlined.
  83          */
  84         tp->t_bind_cpu = PBIND_NONE;    /* no USER-requested binding */
  85         tp->t_bind_pset = PS_NONE;
  86
  87 #if defined(__i386) || defined(__amd64)
  88         tp->t_stk -= STACK_ALIGN;
  89         *(tp->t_stk) = 0;               /* terminate intr thread stack */
  90 #endif
  91
  92         /*
  93          * Link onto CPU's interrupt pool.
  94          */
  95         tp->t_link = cp->cpu_intr_thread;
  96         cp->cpu_intr_thread = tp;
  97 }
  98
  99 /*
 100  * Allocate a given number of interrupt threads for a given CPU.
 101  * These threads will get freed by cpu_destroy_bound_threads()
 102  * when CPU gets unconfigured.
 103  */
 104 void
 105 cpu_intr_alloc(cpu_t *cp, int n)
 106 {
 107         int i;
 108
 109         for (i = 0; i < n; i++)
 110                 thread_create_intr(cp);
 111
 112         cp->cpu_intr_stack = (caddr_t)segkp_get(segkp, INTR_STACK_SIZE,
 113                 KPD_HASREDZONE | KPD_NO_ANON | KPD_LOCKED) +
 114                 INTR_STACK_SIZE - SA(MINFRAME);
 115 }