shared_intr.c revision 1.14
1 /* $NetBSD: shared_intr.c,v 1.14 2000/06/04 05:27:45 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Carnegie-Mellon University. 5 * All rights reserved. 6 * 7 * Authors: Chris G. Demetriou 8 * 9 * Permission to use, copy, modify and distribute this software and 10 * its documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie the 27 * rights to redistribute these changes. 28 */ 29 30 /* 31 * Common shared-interrupt-line functionality. 32 */ 33 34 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 35 36 __KERNEL_RCSID(0, "$NetBSD: shared_intr.c,v 1.14 2000/06/04 05:27:45 thorpej Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/malloc.h> 42 #include <sys/syslog.h> 43 #include <sys/queue.h> 44 45 #include <machine/intr.h> 46 47 static const char *intr_typename __P((int)); 48 49 static const char * 50 intr_typename(int type) 51 { 52 53 switch (type) { 54 case IST_UNUSABLE: 55 return ("disabled"); 56 case IST_NONE: 57 return ("none"); 58 case IST_PULSE: 59 return ("pulsed"); 60 case IST_EDGE: 61 return ("edge-triggered"); 62 case IST_LEVEL: 63 return ("level-triggered"); 64 } 65 panic("intr_typename: unknown type %d", type); 66 } 67 68 struct alpha_shared_intr * 69 alpha_shared_intr_alloc(unsigned int n) 70 { 71 struct alpha_shared_intr *intr; 72 unsigned int i; 73 74 intr = malloc(n * sizeof (struct alpha_shared_intr), M_DEVBUF, 75 cold ? M_NOWAIT : M_WAITOK); 76 if (intr == NULL) 77 panic("alpha_shared_intr_alloc: couldn't malloc intr"); 78 79 for (i = 0; i < n; i++) { 80 TAILQ_INIT(&intr[i].intr_q); 81 intr[i].intr_sharetype = IST_NONE; 82 intr[i].intr_dfltsharetype = IST_NONE; 83 intr[i].intr_nstrays = 0; 84 intr[i].intr_maxstrays = 5; 85 intr[i].intr_private = NULL; 86 } 87 88 return (intr); 89 } 90 91 int 92 alpha_shared_intr_dispatch(struct alpha_shared_intr *intr, unsigned int num) 93 { 94 struct alpha_shared_intrhand *ih; 95 int rv, handled; 96 97 ih = intr[num].intr_q.tqh_first; 98 handled = 0; 99 while (ih != NULL) { 100 101 /* 102 * The handler returns one of three values: 103 * 0: This interrupt wasn't for me. 104 * 1: This interrupt was for me. 105 * -1: This interrupt might have been for me, but I can't say 106 * for sure. 107 */ 108 rv = (*ih->ih_fn)(ih->ih_arg); 109 110 handled = handled || (rv != 0); 111 ih = ih->ih_q.tqe_next; 112 } 113 114 return (handled); 115 } 116 117 void * 118 alpha_shared_intr_establish(struct alpha_shared_intr *intr, unsigned int num, 119 int type, int level, int (*fn)(void *), void *arg, const char *basename) 120 { 121 struct alpha_shared_intrhand *ih; 122 123 if (intr[num].intr_sharetype == IST_UNUSABLE) { 124 printf("alpha_shared_intr_establish: %s %d: unusable\n", 125 basename, num); 126 return NULL; 127 } 128 129 /* no point in sleeping unless someone can free memory. */ 130 ih = malloc(sizeof *ih, M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 131 if (ih == NULL) 132 panic("alpha_shared_intr_establish: can't malloc intrhand"); 133 134 #ifdef DIAGNOSTIC 135 if (type == IST_NONE) 136 panic("alpha_shared_intr_establish: bogus type"); 137 #endif 138 139 switch (intr[num].intr_sharetype) { 140 case IST_EDGE: 141 case IST_LEVEL: 142 if (type == intr[num].intr_sharetype) 143 break; 144 case IST_PULSE: 145 if (type != IST_NONE) { 146 if (intr[num].intr_q.tqh_first == NULL) { 147 printf("alpha_shared_intr_establish: %s %d: warning: using %s on %s\n", 148 basename, num, intr_typename(type), 149 intr_typename(intr[num].intr_sharetype)); 150 type = intr[num].intr_sharetype; 151 } else { 152 panic("alpha_shared_intr_establish: %s %d: can't share %s with %s", 153 basename, num, intr_typename(type), 154 intr_typename(intr[num].intr_sharetype)); 155 } 156 } 157 break; 158 159 case IST_NONE: 160 /* not currently used; safe */ 161 break; 162 } 163 164 ih->ih_intrhead = intr; 165 ih->ih_fn = fn; 166 ih->ih_arg = arg; 167 ih->ih_level = level; 168 ih->ih_num = num; 169 170 intr[num].intr_sharetype = type; 171 TAILQ_INSERT_TAIL(&intr[num].intr_q, ih, ih_q); 172 173 return (ih); 174 } 175 176 void 177 alpha_shared_intr_disestablish(struct alpha_shared_intr *intr, void *cookie, 178 const char *basename) 179 { 180 struct alpha_shared_intrhand *ih = cookie; 181 unsigned int num = ih->ih_num; 182 183 /* 184 * Just remove it from the list and free the entry. We let 185 * the caller deal with resetting the share type, if appropriate. 186 */ 187 TAILQ_REMOVE(&intr[num].intr_q, ih, ih_q); 188 } 189 190 int 191 alpha_shared_intr_get_sharetype(struct alpha_shared_intr *intr, 192 unsigned int num) 193 { 194 195 return (intr[num].intr_sharetype); 196 } 197 198 int 199 alpha_shared_intr_isactive(struct alpha_shared_intr *intr, unsigned int num) 200 { 201 202 return (intr[num].intr_q.tqh_first != NULL); 203 } 204 205 void 206 alpha_shared_intr_set_dfltsharetype(struct alpha_shared_intr *intr, 207 unsigned int num, int newdfltsharetype) 208 { 209 210 #ifdef DIAGNOSTIC 211 if (alpha_shared_intr_isactive(intr, num)) 212 panic("alpha_shared_intr_set_dfltsharetype on active intr"); 213 #endif 214 215 intr[num].intr_dfltsharetype = newdfltsharetype; 216 intr[num].intr_sharetype = intr[num].intr_dfltsharetype; 217 } 218 219 void 220 alpha_shared_intr_set_maxstrays(struct alpha_shared_intr *intr, 221 unsigned int num, int newmaxstrays) 222 { 223 int s = splhigh(); 224 intr[num].intr_maxstrays = newmaxstrays; 225 intr[num].intr_nstrays = 0; 226 splx(s); 227 } 228 229 void 230 alpha_shared_intr_stray(struct alpha_shared_intr *intr, unsigned int num, 231 const char *basename) 232 { 233 234 intr[num].intr_nstrays++; 235 236 if (intr[num].intr_maxstrays == 0) 237 return; 238 239 if (intr[num].intr_nstrays <= intr[num].intr_maxstrays) 240 log(LOG_ERR, "stray %s %d%s\n", basename, num, 241 intr[num].intr_nstrays >= intr[num].intr_maxstrays ? 242 "; stopped logging" : ""); 243 } 244 245 void 246 alpha_shared_intr_set_private(struct alpha_shared_intr *intr, 247 unsigned int num, void *v) 248 { 249 250 intr[num].intr_private = v; 251 } 252 253 void * 254 alpha_shared_intr_get_private(struct alpha_shared_intr *intr, 255 unsigned int num) 256 { 257 258 return (intr[num].intr_private); 259 } 260
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