common/fabric-xlate/fabric-xlate.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 */
#include <fm/libtopo.h>
#include <sys/fm/util.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>

#include <libxml/xpathInternals.h>

#include "fabric-xlate.h"

#define XMLTOPOFILE "/var/run/fab-xlate-topo.xml"

fmd_xprt_t *fab_fmd_xprt;   /* FMD transport layer handle */
char fab_buf[FM_MAX_CLASS];

/* Static FM Topo XML Format and XML XPath Context  */
static xmlDocPtr    fab_doc = NULL;
xmlXPathContextPtr  fab_xpathCtx = NULL;
static int      fab_valid_topo = 0;
static pthread_mutex_t  fab_lock = PTHREAD_MUTEX_INITIALIZER;

static void
fab_update_topo(fmd_hdl_t *hdl)
{
    topo_hdl_t  *thp = NULL;
    FILE        *fp = NULL;
    int     err = 0;
    int     fd = -1;

    /* Open the temporary file with proper ownership */
    while (fd == -1) {
        if ((unlink(XMLTOPOFILE) == -1) && (errno != ENOENT)) {
            fmd_hdl_debug(hdl, "Failed to remove XML topo file\n");
            return;
        }
        fd = open(XMLTOPOFILE, O_RDWR | O_CREAT | O_EXCL, 0600);
        if ((fd == -1) && (errno != EEXIST)) {
            fmd_hdl_debug(hdl, "Failed to create XML topo file\n");
            return;
        }
    }

    /* Associate a stream with the temporary file */
    if ((fp = fdopen(fd, "w")) == NULL) {
        fmd_hdl_debug(hdl, "Failed to open XML topo file\n");
        goto cleanup;
    }

    /* Hold topology */
    if ((thp = fmd_hdl_topo_hold(hdl, TOPO_VERSION)) == NULL) {
        fmd_hdl_debug(hdl, "Failed to hold topo\n");
        goto cleanup;
    }

    /* Print topology to XML file */
    if (topo_xml_print(thp, fp, FM_FMRI_SCHEME_HC, &err) < 0) {
        fmd_hdl_debug(hdl, "Failed to get XML topo\n");
        fmd_hdl_topo_rele(hdl, thp);
        goto cleanup;
    }

    /* Release topology */
    fmd_hdl_topo_rele(hdl, thp);

    /* Reload topology from XML file */
    if (fab_xpathCtx)
        xmlXPathFreeContext(fab_xpathCtx);
    if (fab_doc)
        xmlFreeDoc(fab_doc);
    fab_doc = xmlParseFile(XMLTOPOFILE);
    fab_xpathCtx = xmlXPathNewContext(fab_doc);
    fab_set_fake_rp(hdl);
    fab_valid_topo = 1;

cleanup:
    if (fp != NULL)
        (void) fclose(fp);
    else if (fd != -1)
        (void) close(fd);
    (void) unlink(XMLTOPOFILE);
}

/*ARGSUSED*/
static void
fab_recv(fmd_hdl_t *hdl, fmd_event_t *ep, nvlist_t *nvl, const char *class)
{
    nvlist_t *new_nvl;

    (void) pthread_mutex_lock(&fab_lock);
    if (!fab_valid_topo)
        fab_update_topo(hdl);
    (void) pthread_mutex_unlock(&fab_lock);

    if (nvlist_dup(nvl, &new_nvl, NV_UNIQUE_NAME) != 0) {
        fmd_hdl_error(hdl, "failed to duplicate event");
        return;
    }

    if (fmd_nvl_class_match(hdl, new_nvl, "ereport.io.pci.fabric")) {
        fab_xlate_fabric_erpts(hdl, new_nvl, class);
    } else {
        fab_pr(hdl, ep, new_nvl);
        if (fmd_nvl_class_match(hdl, new_nvl,
            "ereport.io.pciex.rc.epkt")) {
            fab_xlate_epkt_erpts(hdl, new_nvl, class);
        } else {
            fab_xlate_fire_erpts(hdl, new_nvl, class);
        }
    }

    nvlist_free(new_nvl);
}

/* ARGSUSED */
static void
fab_topo(fmd_hdl_t *hdl, topo_hdl_t *topo)
{
    (void) pthread_mutex_lock(&fab_lock);
    fab_valid_topo = 0;
    (void) pthread_mutex_unlock(&fab_lock);
}

static const fmd_hdl_ops_t fmd_ops = {
    fab_recv,   /* fmdo_recv */
    NULL,       /* fmdo_timeout */
    NULL,       /* fmdo_close */
    NULL,       /* fmdo_stats */
    NULL,       /* fmdo_gc */
    NULL,       /* fmdo_send */
    fab_topo,   /* fmdo_topo */
};

static const fmd_hdl_info_t fmd_info = {
    "Fabric Ereport Translater", "1.0", &fmd_ops, NULL
};

void
_fmd_init(fmd_hdl_t *hdl)
{
    if (fmd_hdl_register(hdl, FMD_API_VERSION, &fmd_info) != 0)
        return;

    /* Init libxml */
    xmlInitParser();

    fab_fmd_xprt = fmd_xprt_open(hdl, FMD_XPRT_RDONLY, NULL, NULL);
    fmd_hdl_debug(hdl, "Fabric Translater Started\n");

    fab_setup_master_table();
}

void
_fmd_fini(fmd_hdl_t *hdl)
{
    /* Fini xpath */
    if (fab_xpathCtx)
        xmlXPathFreeContext(fab_xpathCtx);
    /* Free xml document */
    if (fab_doc)
        xmlFreeDoc(fab_doc);
    /* Fini libxml */
    xmlCleanupParser();

    fmd_xprt_close(hdl, fab_fmd_xprt);
}