/* $NetBSD: apei_bert.c,v 1.1.4.2 2024/10/09 13:00:11 martin Exp $ */ /*- * Copyright (c) 2024 The NetBSD Foundation, Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * APEI BERT -- Boot Error Record Table * * https://uefi.org/specs/ACPI/6.5/18_Platform_Error_Interfaces.html#boot-error-source */ #include __KERNEL_RCSID(0, "$NetBSD: apei_bert.c,v 1.1.4.2 2024/10/09 13:00:11 martin Exp $"); #include #include #include #include #include #define _COMPONENT ACPI_RESOURCE_COMPONENT ACPI_MODULE_NAME ("apei") /* * apei_bert_attach(sc) * * Scan the Boot Error Record Table for hardware errors that * happened early at boot or on the previous boot. */ void apei_bert_attach(struct apei_softc *sc) { const ACPI_TABLE_BERT *bert = sc->sc_tab.bert; struct apei_bert_softc *bsc = &sc->sc_bert; bool fatal = false; /* * Verify the table is large enough. */ if (bert->Header.Length < sizeof(*bert)) { aprint_error_dev(sc->sc_dev, "BERT: truncated table:" " %"PRIu32" < %zu bytes\n", bert->Header.Length, sizeof(*bert)); return; } /* * In verbose boots, print the BERT physical address and * length. The operator might find this handy for dd'ing it * from /dev/mem, if allowed. */ aprint_verbose_dev(sc->sc_dev, "BERT: 0x%x bytes at 0x%"PRIx64"\n", bert->RegionLength, bert->Address); /* * Verify the length is enough for a Generic Error Status Block * header, at least. */ if (bert->RegionLength < sizeof(*bsc->bsc_gesb)) { aprint_error_dev(sc->sc_dev, "BERT: truncated boot error region, %"PRIu32" < %zu bytes", bert->RegionLength, sizeof(*bsc->bsc_gesb)); return; } /* * Map the GESB and process it, but don't acknowledge it -- * this is a one-time polled source; it won't (or at least, * shouldn't) change after boot. */ bsc->bsc_gesb = AcpiOsMapMemory(bert->Address, bert->RegionLength); const uint32_t status = apei_gesb_report(sc, bsc->bsc_gesb, bert->RegionLength, "boot error record", &fatal); if (status == 0) { /* * If there were no boot errors, leave a note in dmesg * to this effect without cluttering up the console * unless you asked for it by `boot -v'. */ aprint_verbose_dev(sc->sc_dev, "BERT: no boot errors recorded\n"); } /* * If the error was fatal, print a warning to the console. * Probably not actually fatal now since it is usually related * to early or previous boot. */ if (fatal) { aprint_error_dev(sc->sc_dev, "BERT:" " fatal pre-boot error recorded\n"); } /* XXX expose content via sysctl? */ } /* * apei_bert_detach(sc) * * Free any software resources associated with the Boot Error * Record Table. */ void apei_bert_detach(struct apei_softc *sc) { const ACPI_TABLE_BERT *bert = sc->sc_tab.bert; struct apei_bert_softc *bsc = &sc->sc_bert; if (bsc->bsc_gesb) { AcpiOsUnmapMemory(bsc->bsc_gesb, bert->RegionLength); bsc->bsc_gesb = NULL; } }