io/vscan/vscan_door.c

911106dfb16696472af8c1b7b4c554a829354fa8jm/*
911106dfb16696472af8c1b7b4c554a829354fa8jm * CDDL HEADER START
911106dfb16696472af8c1b7b4c554a829354fa8jm *
911106dfb16696472af8c1b7b4c554a829354fa8jm * The contents of this file are subject to the terms of the
911106dfb16696472af8c1b7b4c554a829354fa8jm * Common Development and Distribution License (the "License").
911106dfb16696472af8c1b7b4c554a829354fa8jm * You may not use this file except in compliance with the License.
911106dfb16696472af8c1b7b4c554a829354fa8jm *
911106dfb16696472af8c1b7b4c554a829354fa8jm * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
911106dfb16696472af8c1b7b4c554a829354fa8jm * or http://www.opensolaris.org/os/licensing.
911106dfb16696472af8c1b7b4c554a829354fa8jm * See the License for the specific language governing permissions
911106dfb16696472af8c1b7b4c554a829354fa8jm * and limitations under the License.
911106dfb16696472af8c1b7b4c554a829354fa8jm *
911106dfb16696472af8c1b7b4c554a829354fa8jm * When distributing Covered Code, include this CDDL HEADER in each
911106dfb16696472af8c1b7b4c554a829354fa8jm * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
911106dfb16696472af8c1b7b4c554a829354fa8jm * If applicable, add the following below this CDDL HEADER, with the
911106dfb16696472af8c1b7b4c554a829354fa8jm * fields enclosed by brackets "[]" replaced with your own identifying
911106dfb16696472af8c1b7b4c554a829354fa8jm * information: Portions Copyright [yyyy] [name of copyright owner]
911106dfb16696472af8c1b7b4c554a829354fa8jm *
911106dfb16696472af8c1b7b4c554a829354fa8jm * CDDL HEADER END
911106dfb16696472af8c1b7b4c554a829354fa8jm */
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm/*
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
911106dfb16696472af8c1b7b4c554a829354fa8jm * Use is subject to license terms.
911106dfb16696472af8c1b7b4c554a829354fa8jm */
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm#include <sys/types.h>
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright#include <sys/errno.h>
911106dfb16696472af8c1b7b4c554a829354fa8jm#include <sys/kmem.h>
911106dfb16696472af8c1b7b4c554a829354fa8jm#include <sys/vnode.h>
911106dfb16696472af8c1b7b4c554a829354fa8jm#include <sys/pathname.h>
911106dfb16696472af8c1b7b4c554a829354fa8jm#include <sys/door.h>
911106dfb16696472af8c1b7b4c554a829354fa8jm#include <sys/cmn_err.h>
911106dfb16696472af8c1b7b4c554a829354fa8jm#include <sys/sunddi.h> /* for string functions */
911106dfb16696472af8c1b7b4c554a829354fa8jm#include <sys/vscan.h>
911106dfb16696472af8c1b7b4c554a829354fa8jm
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright#define VS_DOOR_RETRIES         3
911106dfb16696472af8c1b7b4c554a829354fa8jm
bfc848c632c9eacb2a640246d96e198f1b185c03jm/* max time (secs) to wait for door calls to complete during door_close */
bfc848c632c9eacb2a640246d96e198f1b185c03jm#define VS_DOOR_CLOSE_TIMEOUT_DEFAULT   30
bfc848c632c9eacb2a640246d96e198f1b185c03jmuint32_t vs_door_close_timeout = VS_DOOR_CLOSE_TIMEOUT_DEFAULT;
bfc848c632c9eacb2a640246d96e198f1b185c03jm
911106dfb16696472af8c1b7b4c554a829354fa8jmstatic door_handle_t vscan_door_handle = NULL;
911106dfb16696472af8c1b7b4c554a829354fa8jmstatic kmutex_t vscan_door_mutex;
911106dfb16696472af8c1b7b4c554a829354fa8jmstatic kcondvar_t vscan_door_cv;
911106dfb16696472af8c1b7b4c554a829354fa8jmstatic int vscan_door_call_count = 0;
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm/*
911106dfb16696472af8c1b7b4c554a829354fa8jm * vscan_door_init
911106dfb16696472af8c1b7b4c554a829354fa8jm */
911106dfb16696472af8c1b7b4c554a829354fa8jmint
911106dfb16696472af8c1b7b4c554a829354fa8jmvscan_door_init(void)
911106dfb16696472af8c1b7b4c554a829354fa8jm{
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_init(&vscan_door_mutex, NULL, MUTEX_DEFAULT, NULL);
911106dfb16696472af8c1b7b4c554a829354fa8jm    cv_init(&vscan_door_cv, NULL, CV_DEFAULT, NULL);
911106dfb16696472af8c1b7b4c554a829354fa8jm    return (0);
911106dfb16696472af8c1b7b4c554a829354fa8jm}
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm/*
911106dfb16696472af8c1b7b4c554a829354fa8jm * vscan_door_fini
911106dfb16696472af8c1b7b4c554a829354fa8jm */
911106dfb16696472af8c1b7b4c554a829354fa8jmvoid
911106dfb16696472af8c1b7b4c554a829354fa8jmvscan_door_fini(void)
911106dfb16696472af8c1b7b4c554a829354fa8jm{
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_destroy(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm    cv_destroy(&vscan_door_cv);
911106dfb16696472af8c1b7b4c554a829354fa8jm}
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm/*
911106dfb16696472af8c1b7b4c554a829354fa8jm * vscan_door_open
911106dfb16696472af8c1b7b4c554a829354fa8jm */
911106dfb16696472af8c1b7b4c554a829354fa8jmint
911106dfb16696472af8c1b7b4c554a829354fa8jmvscan_door_open(int door_id)
911106dfb16696472af8c1b7b4c554a829354fa8jm{
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_enter(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm
bfc848c632c9eacb2a640246d96e198f1b185c03jm    if (vscan_door_handle == NULL)
911106dfb16696472af8c1b7b4c554a829354fa8jm        vscan_door_handle = door_ki_lookup(door_id);
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm    if (vscan_door_handle == NULL) {
911106dfb16696472af8c1b7b4c554a829354fa8jm        cmn_err(CE_WARN, "Internal communication error "
911106dfb16696472af8c1b7b4c554a829354fa8jm            "- failed to access vscan service daemon.");
bfc848c632c9eacb2a640246d96e198f1b185c03jm        mutex_exit(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm        return (-1);
911106dfb16696472af8c1b7b4c554a829354fa8jm    }
911106dfb16696472af8c1b7b4c554a829354fa8jm
bfc848c632c9eacb2a640246d96e198f1b185c03jm    mutex_exit(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm    return (0);
911106dfb16696472af8c1b7b4c554a829354fa8jm}
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm/*
911106dfb16696472af8c1b7b4c554a829354fa8jm * vscan_door_close
911106dfb16696472af8c1b7b4c554a829354fa8jm */
911106dfb16696472af8c1b7b4c554a829354fa8jmvoid
911106dfb16696472af8c1b7b4c554a829354fa8jmvscan_door_close(void)
911106dfb16696472af8c1b7b4c554a829354fa8jm{
bfc848c632c9eacb2a640246d96e198f1b185c03jm    clock_t timeout, time_left;
bfc848c632c9eacb2a640246d96e198f1b185c03jm
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_enter(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm    /* wait for any in-progress requests to complete */
bfc848c632c9eacb2a640246d96e198f1b185c03jm    time_left = SEC_TO_TICK(vs_door_close_timeout);
bfc848c632c9eacb2a640246d96e198f1b185c03jm    while ((vscan_door_call_count > 0) && (time_left > 0)) {
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni        timeout = time_left;
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni        time_left = cv_reltimedwait(&vscan_door_cv, &vscan_door_mutex,
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni            timeout, TR_CLOCK_TICK);
911106dfb16696472af8c1b7b4c554a829354fa8jm    }
911106dfb16696472af8c1b7b4c554a829354fa8jm
bfc848c632c9eacb2a640246d96e198f1b185c03jm    if (time_left == -1)
bfc848c632c9eacb2a640246d96e198f1b185c03jm        cmn_err(CE_WARN, "Timeout waiting for door calls to complete");
bfc848c632c9eacb2a640246d96e198f1b185c03jm
911106dfb16696472af8c1b7b4c554a829354fa8jm    if (vscan_door_handle) {
911106dfb16696472af8c1b7b4c554a829354fa8jm        door_ki_rele(vscan_door_handle);
911106dfb16696472af8c1b7b4c554a829354fa8jm        vscan_door_handle = NULL;
911106dfb16696472af8c1b7b4c554a829354fa8jm    }
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_exit(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm}
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm/*
911106dfb16696472af8c1b7b4c554a829354fa8jm * vscan_door_scan_file
bfc848c632c9eacb2a640246d96e198f1b185c03jm *
bfc848c632c9eacb2a640246d96e198f1b185c03jm * Returns: result returned in door response or VS_STATUS_ERROR
911106dfb16696472af8c1b7b4c554a829354fa8jm */
911106dfb16696472af8c1b7b4c554a829354fa8jmint
911106dfb16696472af8c1b7b4c554a829354fa8jmvscan_door_scan_file(vs_scan_req_t *scan_req)
911106dfb16696472af8c1b7b4c554a829354fa8jm{
bfc848c632c9eacb2a640246d96e198f1b185c03jm    int err;
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright    int i;
911106dfb16696472af8c1b7b4c554a829354fa8jm    door_arg_t arg;
bfc848c632c9eacb2a640246d96e198f1b185c03jm    uint32_t result = 0;
911106dfb16696472af8c1b7b4c554a829354fa8jm
bfc848c632c9eacb2a640246d96e198f1b185c03jm    if (!vscan_door_handle)
bfc848c632c9eacb2a640246d96e198f1b185c03jm        return (VS_STATUS_ERROR);
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_enter(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm    vscan_door_call_count++;
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_exit(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm    arg.data_ptr = (char *)scan_req;
911106dfb16696472af8c1b7b4c554a829354fa8jm    arg.data_size = sizeof (vs_scan_req_t);
911106dfb16696472af8c1b7b4c554a829354fa8jm    arg.desc_ptr = NULL;
911106dfb16696472af8c1b7b4c554a829354fa8jm    arg.desc_num = 0;
bfc848c632c9eacb2a640246d96e198f1b185c03jm    arg.rbuf = (char *)&result;
bfc848c632c9eacb2a640246d96e198f1b185c03jm    arg.rsize = sizeof (uint32_t);
911106dfb16696472af8c1b7b4c554a829354fa8jm
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright    for (i = 0; i < VS_DOOR_RETRIES; ++i) {
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright        if ((err = door_ki_upcall_limited(vscan_door_handle, &arg,
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright            NULL, SIZE_MAX, 0)) == 0)
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright            break;
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright        if (err != EAGAIN && err != EINTR)
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright            break;
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright    }
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright
1843d056c3ae0950dec6c3453e589966ba280beeAlan Wright    if (err != 0) {
911106dfb16696472af8c1b7b4c554a829354fa8jm        cmn_err(CE_WARN, "Internal communication error (%d)"
911106dfb16696472af8c1b7b4c554a829354fa8jm            "- failed to send scan request to vscand", err);
bfc848c632c9eacb2a640246d96e198f1b185c03jm        result = VS_STATUS_ERROR;
911106dfb16696472af8c1b7b4c554a829354fa8jm    }
911106dfb16696472af8c1b7b4c554a829354fa8jm
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_enter(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm    vscan_door_call_count--;
911106dfb16696472af8c1b7b4c554a829354fa8jm    cv_signal(&vscan_door_cv);
911106dfb16696472af8c1b7b4c554a829354fa8jm    mutex_exit(&vscan_door_mutex);
911106dfb16696472af8c1b7b4c554a829354fa8jm
bfc848c632c9eacb2a640246d96e198f1b185c03jm    return (result);
911106dfb16696472af8c1b7b4c554a829354fa8jm}