pcp_utils.c revision 66ea84940ca8687745ad2a165ef9bf49ec13996f
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66ea84940ca8687745ad2a165ef9bf49ec13996fVikram Hegde * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Use is subject to license terms.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Implements auxiliary routines declared in pcp_utils.h to facilitate
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * finding the appropriate communication transport & device path for a
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * given service. This supports the transition from the legacy service channel
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * transport (glvc) to the logical domain channel (vldc) transport native
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * to platforms running Logical Domains (LDoms).
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * The mechanism to relate a service to a device path is different for
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * vldc and glvc, due to the way the device pathnames are encoded:
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Sample service: sunvts
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Service Name: SUNW,sun4v-sunvts
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * GLVC device path:
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * "/devices/virtual-devices@100/sunvts@a:glvc"
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * VLDC device path:
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * "/devices/virtual-devices@100/channel-devices@200/virtual-channel@3:sunvts"
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * As VLDC is the communication mechanism used in an LDoms environment, it is
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * the preferred channel, and its existence is checked for first.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Extract from dev_path the "service name" portion.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * For vldc, the service corresponds to the minor name of the device path
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * (e.g. virtual-channel@3:sunvts for sunvts). If service is non-NULL, it must
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * match the extracted service name for the function to succeed.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * The service name is returned in match (if non-NULL), and the function
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * itself returns true on success; false on failure.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayanget_vldc_svc_name(char *dev_path, char *service, char **match)
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan return (false);
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan if (s++ == NULL) {
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan if ((strncmp(devname, VCHAN, strlen(VCHAN)) == 0) ||
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan (strncmp(devname, VCHAN_C, strlen(VCHAN_C)) == 0)) {
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * If in addition, a service string is specified to
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * be matched, do a comparison
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan } else if (match) {
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Extract from dev_path the "service name" portion.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * For glvc, the service corresponds to the node name of the device path
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * (e.g. sunvts@a:glvc for sunvts). If service is non-NULL, it must
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * match the extracted service name for the function to succeed.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * The service name is returned in match (if non-NULL), and the function
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * itself returns true on success; false on failure.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayanget_glvc_svc_name(char *dev_path, char *service, char **match)
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan return (false);
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan if (!((substr != NULL) && (strcmp(substr, GLVC) == 0))) {
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * If a service string is specified, check if there
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * is a match
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan if ((service != NULL) && (strncmp(devname, service, len) != 0))
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * This routine accepts either a prefixed service name or a legacy full
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * pathname (which might not even exist in the filesystem), and in either case
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * returns a canonical service name. If the parameter is neither a service
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * name (i.e. with a "SUNW,sun4v-" prefix), nor a path to a legacy glvc or
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * vldc device, NULL is returned.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * First check whether a service name
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan if (strncmp(devname, SERVICE_PREFIX, strlen(SERVICE_PREFIX)) == 0) {
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Not a service name, check if it's a valid pathname
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Ideally, we should only check for a valid glvc pathname,
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * requiring all vldc access to be only via service names. But
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * to prevent a flag day with code that's already passing in
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * vldc full pathnames (e.g. sunMC), we allow them here.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan if (get_vldc_svc_name(devname, NULL, &vldc_path) == true) {
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan } else if (get_glvc_svc_name(devname, NULL, &glvc_path) == true) {
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Walk all "service" device nodes to find the one with the
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * matching glvc minor name
4bac220845f606f60663ed6f3a2b88caa00ae87enarayanstatic char *
3af08d828975d7e2581b6829e0eecff14d87a483lm /* Ensure that the 'glvc' driver is loaded */
66ea84940ca8687745ad2a165ef9bf49ec13996fVikram Hegde root_node = di_init_driver("glvc", DINFOCPYALL);
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan service_node = di_drv_first_node("glvc", root_node);
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan /* Make sure node name matches service name */
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan if (strcmp(service, di_node_name(service_node)) == 0) {
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan /* Walk minor nodes */
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Walk all vldc device nodes to find the one with the
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * matching minor name
4bac220845f606f60663ed6f3a2b88caa00ae87enarayanstatic char *
9404882939d18ddd3c94a5bd3da7a0449c195a5dranenc /* Ensure that the 'vldc' driver is loaded */
66ea84940ca8687745ad2a165ef9bf49ec13996fVikram Hegde root_node = di_init_driver("vldc", DINFOCPYALL);
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan /* Walk minor nodes */
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * Given a service name or a full legacy pathname, return
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * the full pathname to the appropriate vldc or glvc device.
4bac220845f606f60663ed6f3a2b88caa00ae87enarayanplatsvc_name_to_path(char *svc_or_path, pcp_xport_t *type)
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan if ((service = platsvc_extract_svc_name(svc_or_path)) == NULL)
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * First lookup vldc nodes
4bac220845f606f60663ed6f3a2b88caa00ae87enarayan * If no vldc, try to find a glvc node