/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (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 2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" /* * CPR driver support routines */ #include #include #include #include #include #include #include #include #define CPR_BUFSIZE 128 extern int devi_detach(dev_info_t *, int); extern int devi_attach(dev_info_t *, int); static char *devi_string(dev_info_t *, char *); static int cpr_is_real_device(dev_info_t *); /* * Traverse the dev info tree: * Call each device driver in the system via a special case * of the detach() entry point to quiesce itself. * Suspend children first. * * We only suspend/resume real devices. */ int cpr_suspend_devices(dev_info_t *dip) { int error; char buf[CPR_BUFSIZE]; for (; dip != NULL; dip = ddi_get_next_sibling(dip)) { if (cpr_suspend_devices(ddi_get_child(dip))) return (ENXIO); if (!cpr_is_real_device(dip)) continue; DEBUG2(errp("Suspending device %s\n", devi_string(dip, buf))); ASSERT((DEVI(dip)->devi_cpr_flags & DCF_CPR_SUSPENDED) == 0); if (i_ddi_node_state(dip) != DS_READY) error = DDI_FAILURE; else error = devi_detach(dip, DDI_SUSPEND); if (error == DDI_SUCCESS) DEVI(dip)->devi_cpr_flags |= DCF_CPR_SUSPENDED; else { DEBUG2(errp("WARNING: Unable to suspend device %s\n", devi_string(dip, buf))); cpr_err(CE_WARN, "Unable to suspend device %s.", devi_string(dip, buf)); cpr_err(CE_WARN, "Device is busy or does not " "support suspend/resume."); return (ENXIO); } } return (0); } /* * Traverse the dev info tree: * Call each device driver in the system via a special case * of the attach() entry point to restore itself. * This is a little tricky because it has to reverse the traversal * order of cpr_suspend_devices(). */ int cpr_resume_devices(dev_info_t *start, int resume_failed) { dev_info_t *dip, *next, *last = NULL; int did_suspend; int error = resume_failed; char buf[CPR_BUFSIZE]; while (last != start) { dip = start; next = ddi_get_next_sibling(dip); while (next != last) { dip = next; next = ddi_get_next_sibling(dip); } /* * cpr is the only one that uses this field and the device * itself hasn't resumed yet, there is no need to use a * lock, even though kernel threads are active by now. */ did_suspend = DEVI(dip)->devi_cpr_flags & DCF_CPR_SUSPENDED; if (did_suspend) DEVI(dip)->devi_cpr_flags &= ~DCF_CPR_SUSPENDED; /* * There may be background attaches happening on devices * that were not originally suspended by cpr, so resume * only devices that were suspended by cpr. Also, stop * resuming after the first resume failure, but traverse * the entire tree to clear the suspend flag. */ if (did_suspend && !error) { DEBUG2(errp("Resuming device %s\n", devi_string(dip, buf))); /* * If a device suspended by cpr gets detached during * the resume process (for example, due to hotplugging) * before cpr gets around to issuing it a DDI_RESUME, * we'll have problems. */ if (i_ddi_node_state(dip) != DS_READY) { DEBUG2(errp("WARNING: Skipping %s, device " "not ready for resume\n", devi_string(dip, buf))); cpr_err(CE_WARN, "Skipping %s, device " "not ready for resume", devi_string(dip, buf)); } else if (devi_attach(dip, DDI_RESUME) != DDI_SUCCESS) { DEBUG2(errp( "WARNING: Unable to resume device %s\n", devi_string(dip, buf))); cpr_err(CE_WARN, "Unable to resume device %s", devi_string(dip, buf)); error = ENXIO; } } error = cpr_resume_devices(ddi_get_child(dip), error); last = dip; } return (error); } /* * Returns a string which contains device name and address. */ static char * devi_string(dev_info_t *devi, char *buf) { char *name; char *address; int size; name = ddi_node_name(devi); address = ddi_get_name_addr(devi); size = (name == NULL) ? strlen("") : strlen(name); size += (address == NULL) ? strlen("") : strlen(address); /* * Make sure that we don't over-run the buffer. * There are 2 additional characters in the string. */ ASSERT((size + 2) <= CPR_BUFSIZE); if (name == NULL) (void) strcpy(buf, ""); else (void) strcpy(buf, name); (void) strcat(buf, "@"); if (address == NULL) (void) strcat(buf, ""); else (void) strcat(buf, address); return (buf); } /* * This function determines whether the given device is real (and should * be suspended) or not (pseudo like). If the device has a "reg" property * then it is presumed to have register state to save/restore. */ static int cpr_is_real_device(dev_info_t *dip) { struct regspec *regbuf; int length; int rc; if (ddi_get_driver(dip) == NULL) return (0); /* * First those devices for which special arrangements have been made */ if (DEVI(dip)->devi_pm_flags & (PMC_NEEDS_SR|PMC_PARENTAL_SR)) return (1); if (DEVI(dip)->devi_pm_flags & PMC_NO_SR) return (0); /* * now the general case */ rc = ddi_getlongprop(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS, "reg", (caddr_t)®buf, &length); ASSERT(rc != DDI_PROP_NO_MEMORY); if (rc != DDI_PROP_SUCCESS) { return (0); } else { kmem_free((caddr_t)regbuf, length); return (1); } } /* * Power down the system. */ void cpr_power_down(void) { int is_defined = 0; char *wordexists = "p\" power-off\" find nip swap l! "; char *req = "power-off"; /* * is_defined has value -1 when defined */ prom_interpret(wordexists, (uintptr_t)&is_defined, 0, 0, 0, 0); if (is_defined) { DEBUG1(errp("\ncpr: %s...\n", req)); prom_interpret(req, 0, 0, 0, 0, 0); } }