memerr.c revision 1.6
1 /* $NetBSD: memerr.c,v 1.6 1996/11/13 07:05:14 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * All advertising materials mentioning features or use of this software 12 * must display the following acknowledgement: 13 * This product includes software developed by the University of 14 * California, Lawrence Berkeley Laboratory. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. All advertising materials mentioning features or use of this software 25 * must display the following acknowledgement: 26 * This product includes software developed by the University of 27 * California, Berkeley and its contributors. 28 * 4. Neither the name of the University nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 * 44 * @(#)memreg.c 8.1 (Berkeley) 6/11/93 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/device.h> 50 51 #include <machine/autoconf.h> 52 #include <machine/cpu.h> 53 #include <machine/obio.h> 54 #include <machine/pte.h> 55 56 #include <sun3/dev/memerr.h> 57 /* #include <sun3/dev/eccreg.h> - not yet */ 58 59 #define ME_PRI 7 /* Interrupt level (NMI) */ 60 61 extern unsigned char cpu_machine_id; 62 63 enum memerr_type { ME_PAR = 0, ME_ECC = 1 }; 64 65 struct memerr_softc { 66 struct device sc_dev; 67 struct memerr *sc_reg; 68 enum memerr_type sc_type; 69 char *sc_typename; /* "Parity" or "ECC" */ 70 char *sc_csrbits; /* how to print csr bits */ 71 /* XXX: counters? */ 72 }; 73 74 static int memerr_match __P((struct device *, void *vcf, void *args)); 75 static void memerr_attach __P((struct device *, struct device *, void *)); 76 static int memerr_interrupt __P((void *)); 77 static void memerr_correctable __P((struct memerr_softc *)); 78 79 struct cfattach memerr_ca = { 80 sizeof(struct memerr_softc), memerr_match, memerr_attach 81 }; 82 83 struct cfdriver memerr_cd = { 84 NULL, "memerr", DV_DULL 85 }; 86 87 88 static int 89 memerr_match(parent, vcf, args) 90 struct device *parent; 91 void *vcf, *args; 92 { 93 struct cfdata *cf = vcf; 94 struct confargs *ca = args; 95 96 /* This driver only supports one unit. */ 97 if (cf->cf_unit != 0) 98 return (0); 99 100 /* The peek returns -1 on bus error. */ 101 if (bus_peek(ca->ca_bustype, ca->ca_paddr, 1) == -1) 102 return (0); 103 104 /* Default interrupt priority. */ 105 if (ca->ca_intpri == -1) 106 ca->ca_intpri = ME_PRI; 107 108 return (1); 109 } 110 111 static void 112 memerr_attach(parent, self, args) 113 struct device *parent; 114 struct device *self; 115 void *args; 116 { 117 struct memerr_softc *sc = (void *)self; 118 struct confargs *ca = args; 119 struct memerr *mer; 120 121 /* 122 * Which type of memory subsystem do we have? 123 */ 124 switch (cpu_machine_id) { 125 case SUN3_MACH_160: /* XXX: correct? */ 126 case SUN3_MACH_260: 127 sc->sc_type = ME_ECC; 128 sc->sc_typename = "ECC"; 129 sc->sc_csrbits = ME_ECC_STR; 130 break; 131 132 default: 133 sc->sc_type = ME_PAR; 134 sc->sc_typename = "Parity"; 135 sc->sc_csrbits = ME_PAR_STR; 136 break; 137 } 138 printf(": (%s memory)\n", sc->sc_typename); 139 140 mer = (struct memerr *) 141 obio_alloc(ca->ca_paddr, sizeof(*mer)); 142 if (mer == NULL) 143 panic("memerr: can not map register"); 144 sc->sc_reg = mer; 145 146 /* Install interrupt handler. */ 147 isr_add_autovect(memerr_interrupt, 148 (void *)sc, ca->ca_intpri); 149 150 /* Enable error interrupt (and checking). */ 151 if (sc->sc_type == ME_PAR) 152 mer->me_csr = ME_CSR_IENA | ME_PAR_CHECK; 153 else { 154 /* 155 * XXX: Some day, figure out how to decode 156 * correctable errors and set ME_ECC_CE_ENA 157 * here so we can log them... 158 */ 159 mer->me_csr = ME_CSR_IENA; /* | ME_ECC_CE_ENA */ 160 } 161 } 162 163 /***************************************************************** 164 * Functions for ECC memory 165 *****************************************************************/ 166 167 static int 168 memerr_interrupt(arg) 169 void *arg; 170 { 171 struct memerr_softc *sc = arg; 172 volatile struct memerr *me = sc->sc_reg; 173 u_char csr, ctx, err; 174 u_int pa, va; 175 int pte; 176 char bits[64]; 177 178 csr = me->me_csr; 179 if ((csr & ME_CSR_IPEND) == 0) 180 return (0); 181 182 va = me->me_vaddr; 183 ctx = (va >> 28) & 0xF; 184 va &= 0x0FFFffff; 185 pte = get_pte(va); 186 pa = PG_PA(pte); 187 188 printf("\nMemory error on %s cycle!\n", 189 (ctx & 8) ? "DVMA" : "CPU"); 190 printf(" ctx=%d, vaddr=0x%x, paddr=0x%x\n", 191 (ctx & 7), va, pa); 192 printf(" csr=%s\n", bitmask_snprintf(csr, sc->sc_csrbits, 193 bits, sizeof(bits))); 194 195 /* 196 * If we have parity-checked memory, there is 197 * not much to be done. Any error is fatal. 198 */ 199 if (sc->sc_type == ME_PAR) { 200 if (csr & ME_PAR_EMASK) { 201 /* Parity errors are fatal. */ 202 goto die; 203 } 204 /* The IPEND bit was set, but no error bits. */ 205 goto noerror; 206 } 207 208 /* 209 * We have ECC memory. More complicated... 210 */ 211 if (csr & (ME_ECC_WBTMO | ME_ECC_WBERR)) { 212 printf(" write-back failed, pte=0x%x\n", pte); 213 goto die; 214 } 215 if (csr & ME_ECC_UE) { 216 printf(" uncorrectable ECC error\n"); 217 goto die; 218 } 219 if (csr & ME_ECC_CE) { 220 /* Just log this and continue. */ 221 memerr_correctable(sc); 222 goto recover; 223 } 224 /* The IPEND bit was set, but no error bits. */ 225 goto noerror; 226 227 die: 228 panic("all bets are off..."); 229 230 noerror: 231 printf("memerr: no error bits set?\n"); 232 233 recover: 234 /* Clear the error by writing the address register. */ 235 me->me_vaddr = 0; 236 return (1); 237 } 238 239 /* 240 * Announce (and log) a correctable ECC error. 241 * Need to look at the ECC syndrome register on 242 * the memory board that caused the error... 243 */ 244 void 245 memerr_correctable(sc) 246 struct memerr_softc *sc; 247 { 248 /* XXX: Not yet... */ 249 } 250
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