cma_page_arch.c revision 5f149bca52352f45598e5563debe72ce04bd7a21
5f149bca52352f45598e5563debe72ce04bd7a21cy/*
5f149bca52352f45598e5563debe72ce04bd7a21cy * CDDL HEADER START
5f149bca52352f45598e5563debe72ce04bd7a21cy *
5f149bca52352f45598e5563debe72ce04bd7a21cy * The contents of this file are subject to the terms of the
5f149bca52352f45598e5563debe72ce04bd7a21cy * Common Development and Distribution License (the "License").
5f149bca52352f45598e5563debe72ce04bd7a21cy * You may not use this file except in compliance with the License.
5f149bca52352f45598e5563debe72ce04bd7a21cy *
5f149bca52352f45598e5563debe72ce04bd7a21cy * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
5f149bca52352f45598e5563debe72ce04bd7a21cy * or http://www.opensolaris.org/os/licensing.
5f149bca52352f45598e5563debe72ce04bd7a21cy * See the License for the specific language governing permissions
5f149bca52352f45598e5563debe72ce04bd7a21cy * and limitations under the License.
5f149bca52352f45598e5563debe72ce04bd7a21cy *
5f149bca52352f45598e5563debe72ce04bd7a21cy * When distributing Covered Code, include this CDDL HEADER in each
5f149bca52352f45598e5563debe72ce04bd7a21cy * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
5f149bca52352f45598e5563debe72ce04bd7a21cy * If applicable, add the following below this CDDL HEADER, with the
5f149bca52352f45598e5563debe72ce04bd7a21cy * fields enclosed by brackets "[]" replaced with your own identifying
5f149bca52352f45598e5563debe72ce04bd7a21cy * information: Portions Copyright [yyyy] [name of copyright owner]
5f149bca52352f45598e5563debe72ce04bd7a21cy *
5f149bca52352f45598e5563debe72ce04bd7a21cy * CDDL HEADER END
5f149bca52352f45598e5563debe72ce04bd7a21cy */
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy/*
5f149bca52352f45598e5563debe72ce04bd7a21cy * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
5f149bca52352f45598e5563debe72ce04bd7a21cy * Use is subject to license terms.
5f149bca52352f45598e5563debe72ce04bd7a21cy */
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy#pragma ident "%Z%%M% %I% %E% SMI"
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy/*
5f149bca52352f45598e5563debe72ce04bd7a21cy * Page retirement can be an extended process due to the fact that a retirement
5f149bca52352f45598e5563debe72ce04bd7a21cy * may not be possible when the original request is made. The kernel will
5f149bca52352f45598e5563debe72ce04bd7a21cy * repeatedly attempt to retire a given page, but will not let us know when the
5f149bca52352f45598e5563debe72ce04bd7a21cy * page has been retired. We therefore have to poll to see if the retirement
5f149bca52352f45598e5563debe72ce04bd7a21cy * has been completed. This poll is implemented with a bounded exponential
5f149bca52352f45598e5563debe72ce04bd7a21cy * backoff to reduce the burden which we impose upon the system.
5f149bca52352f45598e5563debe72ce04bd7a21cy *
5f149bca52352f45598e5563debe72ce04bd7a21cy * To reduce the burden on fmd in the face of retirement storms, we schedule
5f149bca52352f45598e5563debe72ce04bd7a21cy * all retries as a group. In the simplest case, we attempt to retire a single
5f149bca52352f45598e5563debe72ce04bd7a21cy * page. When forced to retry, we initially schedule a retry at a configurable
5f149bca52352f45598e5563debe72ce04bd7a21cy * interval t. If the retry fails, we schedule another at 2 * t, and so on,
5f149bca52352f45598e5563debe72ce04bd7a21cy * until t reaches the maximum interval (also configurable). Future retries
5f149bca52352f45598e5563debe72ce04bd7a21cy * for that page will occur with t equal to the maximum interval value. We
5f149bca52352f45598e5563debe72ce04bd7a21cy * will never give up on a retirement.
5f149bca52352f45598e5563debe72ce04bd7a21cy *
5f149bca52352f45598e5563debe72ce04bd7a21cy * With multiple retirements, the situation gets slightly more complicated. As
5f149bca52352f45598e5563debe72ce04bd7a21cy * indicated above, we schedule retries as a group. We don't want to deny new
5f149bca52352f45598e5563debe72ce04bd7a21cy * pages their short retry intervals, so we'll (re)set the retry interval to the
5f149bca52352f45598e5563debe72ce04bd7a21cy * value appropriate for the newest page.
5f149bca52352f45598e5563debe72ce04bd7a21cy */
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <cma.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <fcntl.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <errno.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <unistd.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <strings.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <fm/fmd_api.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <fm/libtopo.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <sys/fm/protocol.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy#include <sys/mem.h>
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cyint
5f149bca52352f45598e5563debe72ce04bd7a21cycma_page_cmd(fmd_hdl_t *hdl, int cmd, nvlist_t *nvl)
5f149bca52352f45598e5563debe72ce04bd7a21cy{
5f149bca52352f45598e5563debe72ce04bd7a21cy mem_page_t mpage;
5f149bca52352f45598e5563debe72ce04bd7a21cy char *fmribuf;
5f149bca52352f45598e5563debe72ce04bd7a21cy size_t fmrisz;
5f149bca52352f45598e5563debe72ce04bd7a21cy int fd, rc, err;
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy if ((fd = open("/dev/mem", O_RDONLY)) < 0)
5f149bca52352f45598e5563debe72ce04bd7a21cy return (-1); /* errno is set for us */
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy if ((errno = nvlist_size(nvl, &fmrisz, NV_ENCODE_NATIVE)) != 0 ||
5f149bca52352f45598e5563debe72ce04bd7a21cy fmrisz > MEM_FMRI_MAX_BUFSIZE ||
5f149bca52352f45598e5563debe72ce04bd7a21cy (fmribuf = fmd_hdl_alloc(hdl, fmrisz, FMD_SLEEP)) == NULL) {
5f149bca52352f45598e5563debe72ce04bd7a21cy (void) close(fd);
5f149bca52352f45598e5563debe72ce04bd7a21cy return (-1); /* errno is set for us */
5f149bca52352f45598e5563debe72ce04bd7a21cy }
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy if ((errno = nvlist_pack(nvl, &fmribuf, &fmrisz,
5f149bca52352f45598e5563debe72ce04bd7a21cy NV_ENCODE_NATIVE, 0)) != 0) {
5f149bca52352f45598e5563debe72ce04bd7a21cy fmd_hdl_free(hdl, fmribuf, fmrisz);
5f149bca52352f45598e5563debe72ce04bd7a21cy (void) close(fd);
5f149bca52352f45598e5563debe72ce04bd7a21cy return (-1); /* errno is set for us */
5f149bca52352f45598e5563debe72ce04bd7a21cy }
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy mpage.m_fmri = fmribuf;
5f149bca52352f45598e5563debe72ce04bd7a21cy mpage.m_fmrisz = fmrisz;
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy if ((rc = ioctl(fd, cmd, &mpage)) < 0)
5f149bca52352f45598e5563debe72ce04bd7a21cy err = errno;
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy fmd_hdl_free(hdl, fmribuf, fmrisz);
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy (void) close(fd);
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy if (rc < 0) {
5f149bca52352f45598e5563debe72ce04bd7a21cy errno = err;
5f149bca52352f45598e5563debe72ce04bd7a21cy return (-1);
5f149bca52352f45598e5563debe72ce04bd7a21cy }
5f149bca52352f45598e5563debe72ce04bd7a21cy
5f149bca52352f45598e5563debe72ce04bd7a21cy return (0);
5f149bca52352f45598e5563debe72ce04bd7a21cy}