17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * CDDL HEADER START
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
51ae08745Sheppo * Common Development and Distribution License (the "License").
61ae08745Sheppo * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate *
87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate * and limitations under the License.
127c478bd9Sstevel@tonic-gate *
137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate *
197c478bd9Sstevel@tonic-gate * CDDL HEADER END
207c478bd9Sstevel@tonic-gate */
217c478bd9Sstevel@tonic-gate /*
22*19397407SSherry Moore * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
237c478bd9Sstevel@tonic-gate * Use is subject to license terms.
247c478bd9Sstevel@tonic-gate */
257c478bd9Sstevel@tonic-gate
267c478bd9Sstevel@tonic-gate
277c478bd9Sstevel@tonic-gate /*
287c478bd9Sstevel@tonic-gate * sun4v machine description driver
297c478bd9Sstevel@tonic-gate */
307c478bd9Sstevel@tonic-gate
317c478bd9Sstevel@tonic-gate #include <sys/types.h>
327c478bd9Sstevel@tonic-gate #include <sys/file.h>
337c478bd9Sstevel@tonic-gate #include <sys/errno.h>
347c478bd9Sstevel@tonic-gate #include <sys/open.h>
357c478bd9Sstevel@tonic-gate #include <sys/cred.h>
367c478bd9Sstevel@tonic-gate #include <sys/uio.h>
377c478bd9Sstevel@tonic-gate #include <sys/stat.h>
387c478bd9Sstevel@tonic-gate #include <sys/ksynch.h>
397c478bd9Sstevel@tonic-gate #include <sys/modctl.h>
407c478bd9Sstevel@tonic-gate #include <sys/conf.h>
417c478bd9Sstevel@tonic-gate #include <sys/devops.h>
427c478bd9Sstevel@tonic-gate #include <sys/debug.h>
437c478bd9Sstevel@tonic-gate #include <sys/cmn_err.h>
447c478bd9Sstevel@tonic-gate #include <sys/ddi.h>
457c478bd9Sstevel@tonic-gate #include <sys/sunddi.h>
467c478bd9Sstevel@tonic-gate
477c478bd9Sstevel@tonic-gate #include <sys/mdesc.h>
487c478bd9Sstevel@tonic-gate #include <sys/mach_descrip.h>
497c478bd9Sstevel@tonic-gate
507c478bd9Sstevel@tonic-gate #define MDESC_NAME "mdesc"
517c478bd9Sstevel@tonic-gate
527c478bd9Sstevel@tonic-gate /*
537c478bd9Sstevel@tonic-gate * Operational state flags
547c478bd9Sstevel@tonic-gate */
557c478bd9Sstevel@tonic-gate
561ae08745Sheppo #define MDESC_GOT_HANDLE 0x10 /* Got mdesc handle */
571ae08745Sheppo #define MDESC_BUSY 0x20 /* Device is busy */
587c478bd9Sstevel@tonic-gate
591ae08745Sheppo static void *mdesc_state_head;
601ae08745Sheppo static vmem_t *mdesc_minor;
611ae08745Sheppo static uint16_t mdesc_max_opens = 256;
621ae08745Sheppo static uint16_t mdesc_opens = 0;
631ae08745Sheppo static int mdesc_attached = 0;
641ae08745Sheppo static dev_info_t *mdesc_devi;
651ae08745Sheppo static kmutex_t mdesc_lock;
667c478bd9Sstevel@tonic-gate
677c478bd9Sstevel@tonic-gate struct mdesc_state {
687c478bd9Sstevel@tonic-gate int instance;
691ae08745Sheppo dev_t dev;
707c478bd9Sstevel@tonic-gate kmutex_t lock;
717c478bd9Sstevel@tonic-gate kcondvar_t cv;
727c478bd9Sstevel@tonic-gate size_t mdesc_len;
731ae08745Sheppo md_t *mdesc;
747c478bd9Sstevel@tonic-gate int flags;
757c478bd9Sstevel@tonic-gate };
767c478bd9Sstevel@tonic-gate
771ae08745Sheppo typedef struct mdesc_state mdesc_state_t;
781ae08745Sheppo
797c478bd9Sstevel@tonic-gate static int mdesc_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **);
807c478bd9Sstevel@tonic-gate static int mdesc_attach(dev_info_t *, ddi_attach_cmd_t);
817c478bd9Sstevel@tonic-gate static int mdesc_detach(dev_info_t *, ddi_detach_cmd_t);
827c478bd9Sstevel@tonic-gate static int mdesc_open(dev_t *, int, int, cred_t *);
837c478bd9Sstevel@tonic-gate static int mdesc_close(dev_t, int, int, cred_t *);
847c478bd9Sstevel@tonic-gate static int mdesc_read(dev_t, struct uio *, cred_t *);
857c478bd9Sstevel@tonic-gate static int mdesc_write(dev_t, struct uio *, cred_t *);
867c478bd9Sstevel@tonic-gate static int mdesc_rw(dev_t, struct uio *, enum uio_rw);
877c478bd9Sstevel@tonic-gate static int mdesc_ioctl(dev_t, int, intptr_t, int, cred_t *, int *);
887c478bd9Sstevel@tonic-gate
897c478bd9Sstevel@tonic-gate static struct cb_ops mdesc_cb_ops = {
907c478bd9Sstevel@tonic-gate mdesc_open, /* cb_open */
917c478bd9Sstevel@tonic-gate mdesc_close, /* cb_close */
927c478bd9Sstevel@tonic-gate nodev, /* cb_strategy */
937c478bd9Sstevel@tonic-gate nodev, /* cb_print */
947c478bd9Sstevel@tonic-gate nodev, /* cb_dump */
957c478bd9Sstevel@tonic-gate mdesc_read, /* cb_read */
967c478bd9Sstevel@tonic-gate nodev, /* cb_write */
977c478bd9Sstevel@tonic-gate mdesc_ioctl, /* cb_ioctl */
987c478bd9Sstevel@tonic-gate nodev, /* cb_devmap */
997c478bd9Sstevel@tonic-gate nodev, /* cb_mmap */
1007c478bd9Sstevel@tonic-gate nodev, /* cb_segmap */
1017c478bd9Sstevel@tonic-gate nochpoll, /* cb_chpoll */
1027c478bd9Sstevel@tonic-gate ddi_prop_op, /* cb_prop_op */
1037c478bd9Sstevel@tonic-gate (struct streamtab *)NULL, /* cb_str */
1047c478bd9Sstevel@tonic-gate D_MP | D_64BIT, /* cb_flag */
1057c478bd9Sstevel@tonic-gate CB_REV, /* cb_rev */
1067c478bd9Sstevel@tonic-gate nodev, /* cb_aread */
1077c478bd9Sstevel@tonic-gate nodev /* cb_awrite */
1087c478bd9Sstevel@tonic-gate };
1097c478bd9Sstevel@tonic-gate
1107c478bd9Sstevel@tonic-gate static struct dev_ops mdesc_dev_ops = {
1117c478bd9Sstevel@tonic-gate DEVO_REV, /* devo_rev */
1127c478bd9Sstevel@tonic-gate 0, /* devo_refcnt */
1137c478bd9Sstevel@tonic-gate mdesc_getinfo, /* devo_getinfo */
1147c478bd9Sstevel@tonic-gate nulldev, /* devo_identify */
1157c478bd9Sstevel@tonic-gate nulldev, /* devo_probe */
1167c478bd9Sstevel@tonic-gate mdesc_attach, /* devo_attach */
1177c478bd9Sstevel@tonic-gate mdesc_detach, /* devo_detach */
1187c478bd9Sstevel@tonic-gate nodev, /* devo_reset */
1197c478bd9Sstevel@tonic-gate &mdesc_cb_ops, /* devo_cb_ops */
1207c478bd9Sstevel@tonic-gate (struct bus_ops *)NULL, /* devo_bus_ops */
121*19397407SSherry Moore nulldev, /* devo_power */
122*19397407SSherry Moore ddi_quiesce_not_needed, /* quiesce */
1237c478bd9Sstevel@tonic-gate };
1247c478bd9Sstevel@tonic-gate
1257c478bd9Sstevel@tonic-gate static struct modldrv modldrv = {
1267c478bd9Sstevel@tonic-gate &mod_driverops,
127*19397407SSherry Moore "Machine Description Driver",
1287c478bd9Sstevel@tonic-gate &mdesc_dev_ops};
1297c478bd9Sstevel@tonic-gate
1307c478bd9Sstevel@tonic-gate static struct modlinkage modlinkage = {
1317c478bd9Sstevel@tonic-gate MODREV_1,
1327c478bd9Sstevel@tonic-gate (void *)&modldrv,
1337c478bd9Sstevel@tonic-gate NULL
1347c478bd9Sstevel@tonic-gate };
1357c478bd9Sstevel@tonic-gate
1367c478bd9Sstevel@tonic-gate
1377c478bd9Sstevel@tonic-gate int
_init(void)1387c478bd9Sstevel@tonic-gate _init(void)
1397c478bd9Sstevel@tonic-gate {
1407c478bd9Sstevel@tonic-gate int retval;
1417c478bd9Sstevel@tonic-gate
1427c478bd9Sstevel@tonic-gate if ((retval = ddi_soft_state_init(&mdesc_state_head,
1431ae08745Sheppo sizeof (struct mdesc_state), mdesc_max_opens)) != 0)
1447c478bd9Sstevel@tonic-gate return (retval);
1457c478bd9Sstevel@tonic-gate if ((retval = mod_install(&modlinkage)) != 0) {
1467c478bd9Sstevel@tonic-gate ddi_soft_state_fini(&mdesc_state_head);
1477c478bd9Sstevel@tonic-gate return (retval);
1487c478bd9Sstevel@tonic-gate }
1497c478bd9Sstevel@tonic-gate
1507c478bd9Sstevel@tonic-gate return (retval);
1517c478bd9Sstevel@tonic-gate }
1527c478bd9Sstevel@tonic-gate
1537c478bd9Sstevel@tonic-gate
1547c478bd9Sstevel@tonic-gate
1557c478bd9Sstevel@tonic-gate
1567c478bd9Sstevel@tonic-gate int
_info(struct modinfo * modinfop)1577c478bd9Sstevel@tonic-gate _info(struct modinfo *modinfop)
1587c478bd9Sstevel@tonic-gate {
1597c478bd9Sstevel@tonic-gate return (mod_info(&modlinkage, modinfop));
1607c478bd9Sstevel@tonic-gate }
1617c478bd9Sstevel@tonic-gate
1627c478bd9Sstevel@tonic-gate
1637c478bd9Sstevel@tonic-gate
1647c478bd9Sstevel@tonic-gate
1657c478bd9Sstevel@tonic-gate int
_fini(void)1667c478bd9Sstevel@tonic-gate _fini(void)
1677c478bd9Sstevel@tonic-gate {
1687c478bd9Sstevel@tonic-gate int retval;
1697c478bd9Sstevel@tonic-gate
1707c478bd9Sstevel@tonic-gate if ((retval = mod_remove(&modlinkage)) != 0)
1717c478bd9Sstevel@tonic-gate return (retval);
1727c478bd9Sstevel@tonic-gate ddi_soft_state_fini(&mdesc_state_head);
1737c478bd9Sstevel@tonic-gate
1747c478bd9Sstevel@tonic-gate return (retval);
1757c478bd9Sstevel@tonic-gate }
1767c478bd9Sstevel@tonic-gate
1777c478bd9Sstevel@tonic-gate
1787c478bd9Sstevel@tonic-gate
1797c478bd9Sstevel@tonic-gate
1807c478bd9Sstevel@tonic-gate /*ARGSUSED*/
1817c478bd9Sstevel@tonic-gate static int
mdesc_getinfo(dev_info_t * dip,ddi_info_cmd_t cmd,void * arg,void ** resultp)1827c478bd9Sstevel@tonic-gate mdesc_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp)
1837c478bd9Sstevel@tonic-gate {
1847c478bd9Sstevel@tonic-gate struct mdesc_state *mdsp;
1857c478bd9Sstevel@tonic-gate int retval = DDI_FAILURE;
1867c478bd9Sstevel@tonic-gate
1877c478bd9Sstevel@tonic-gate ASSERT(resultp != NULL);
1887c478bd9Sstevel@tonic-gate
1897c478bd9Sstevel@tonic-gate switch (cmd) {
1907c478bd9Sstevel@tonic-gate case DDI_INFO_DEVT2DEVINFO:
1911ae08745Sheppo mdsp = ddi_get_soft_state(mdesc_state_head,
1921ae08745Sheppo getminor((dev_t)arg));
1931ae08745Sheppo if (mdsp != NULL) {
1941ae08745Sheppo *resultp = mdesc_devi;
1957c478bd9Sstevel@tonic-gate retval = DDI_SUCCESS;
1967c478bd9Sstevel@tonic-gate } else
1977c478bd9Sstevel@tonic-gate *resultp = NULL;
1987c478bd9Sstevel@tonic-gate break;
1997c478bd9Sstevel@tonic-gate case DDI_INFO_DEVT2INSTANCE:
2000bd5614cSiskreen *resultp = (void *)(uintptr_t)getminor((dev_t)arg);
2017c478bd9Sstevel@tonic-gate retval = DDI_SUCCESS;
2027c478bd9Sstevel@tonic-gate break;
2037c478bd9Sstevel@tonic-gate }
2047c478bd9Sstevel@tonic-gate
2057c478bd9Sstevel@tonic-gate return (retval);
2067c478bd9Sstevel@tonic-gate }
2077c478bd9Sstevel@tonic-gate
2087c478bd9Sstevel@tonic-gate
2097c478bd9Sstevel@tonic-gate
2107c478bd9Sstevel@tonic-gate
2117c478bd9Sstevel@tonic-gate static int
mdesc_attach(dev_info_t * dip,ddi_attach_cmd_t cmd)2127c478bd9Sstevel@tonic-gate mdesc_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
2137c478bd9Sstevel@tonic-gate {
2147c478bd9Sstevel@tonic-gate int instance = ddi_get_instance(dip);
2157c478bd9Sstevel@tonic-gate
2167c478bd9Sstevel@tonic-gate switch (cmd) {
2177c478bd9Sstevel@tonic-gate case DDI_ATTACH:
2181ae08745Sheppo
2197c478bd9Sstevel@tonic-gate if (ddi_create_minor_node(dip, MDESC_NAME, S_IFCHR, instance,
2207c478bd9Sstevel@tonic-gate DDI_PSEUDO, 0) != DDI_SUCCESS) {
2217c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "%s@%d: Unable to create minor node",
2227c478bd9Sstevel@tonic-gate MDESC_NAME, instance);
2237c478bd9Sstevel@tonic-gate return (DDI_FAILURE);
2247c478bd9Sstevel@tonic-gate }
2257c478bd9Sstevel@tonic-gate ddi_report_dev(dip);
2261ae08745Sheppo mdesc_devi = dip;
2271ae08745Sheppo mdesc_minor = vmem_create("mdesc_minor", (void *) 1,
2281ae08745Sheppo mdesc_max_opens, 1, NULL, NULL, NULL, 0,
2291ae08745Sheppo VM_SLEEP | VMC_IDENTIFIER);
2301ae08745Sheppo mutex_init(&mdesc_lock, NULL, MUTEX_DRIVER, NULL);
2311ae08745Sheppo mdesc_attached = 1;
2327c478bd9Sstevel@tonic-gate return (DDI_SUCCESS);
2337c478bd9Sstevel@tonic-gate case DDI_RESUME:
2347c478bd9Sstevel@tonic-gate return (DDI_SUCCESS);
2357c478bd9Sstevel@tonic-gate default:
2367c478bd9Sstevel@tonic-gate return (DDI_FAILURE);
2377c478bd9Sstevel@tonic-gate }
2387c478bd9Sstevel@tonic-gate }
2397c478bd9Sstevel@tonic-gate
2401ae08745Sheppo /*ARGSUSED*/
2417c478bd9Sstevel@tonic-gate static int
mdesc_detach(dev_info_t * dip,ddi_detach_cmd_t cmd)2427c478bd9Sstevel@tonic-gate mdesc_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
2437c478bd9Sstevel@tonic-gate {
2447c478bd9Sstevel@tonic-gate switch (cmd) {
2457c478bd9Sstevel@tonic-gate case DDI_DETACH:
2461ae08745Sheppo mutex_destroy(&mdesc_lock);
2471ae08745Sheppo vmem_destroy(mdesc_minor);
2481ae08745Sheppo ddi_remove_minor_node(mdesc_devi, NULL);
2491ae08745Sheppo mdesc_attached = 0;
2507c478bd9Sstevel@tonic-gate return (DDI_SUCCESS);
2517c478bd9Sstevel@tonic-gate
2527c478bd9Sstevel@tonic-gate case DDI_SUSPEND:
2537c478bd9Sstevel@tonic-gate return (DDI_SUCCESS);
2547c478bd9Sstevel@tonic-gate
2557c478bd9Sstevel@tonic-gate default:
2567c478bd9Sstevel@tonic-gate return (DDI_FAILURE);
2577c478bd9Sstevel@tonic-gate }
2587c478bd9Sstevel@tonic-gate }
2597c478bd9Sstevel@tonic-gate
2601ae08745Sheppo static void
mdesc_destroy_state(mdesc_state_t * mdsp)2611ae08745Sheppo mdesc_destroy_state(mdesc_state_t *mdsp)
2621ae08745Sheppo {
2631ae08745Sheppo minor_t minor = getminor(mdsp->dev);
2641ae08745Sheppo
2651ae08745Sheppo if (mdsp->flags & MDESC_GOT_HANDLE)
2661ae08745Sheppo (void) md_fini_handle(mdsp->mdesc);
2671ae08745Sheppo
2681ae08745Sheppo cv_destroy(&mdsp->cv);
2691ae08745Sheppo mutex_destroy(&mdsp->lock);
2701ae08745Sheppo ddi_soft_state_free(mdesc_state_head, minor);
2711ae08745Sheppo vmem_free(mdesc_minor, (void *)(uintptr_t)minor, 1);
2721ae08745Sheppo }
2731ae08745Sheppo
2741ae08745Sheppo static mdesc_state_t *
mdesc_create_state(dev_t * devp)2751ae08745Sheppo mdesc_create_state(dev_t *devp)
2761ae08745Sheppo {
2771ae08745Sheppo major_t major;
2781ae08745Sheppo minor_t minor;
2791ae08745Sheppo mdesc_state_t *mdsp;
2801ae08745Sheppo
2811ae08745Sheppo minor = (minor_t)(uintptr_t)vmem_alloc(mdesc_minor, 1,
2821ae08745Sheppo VM_BESTFIT | VM_SLEEP);
2831ae08745Sheppo
2841ae08745Sheppo if (ddi_soft_state_zalloc(mdesc_state_head, minor) !=
2851ae08745Sheppo DDI_SUCCESS) {
2861ae08745Sheppo cmn_err(CE_WARN, "%s@%d: Unable to allocate state",
2871ae08745Sheppo MDESC_NAME, minor);
2881ae08745Sheppo vmem_free(mdesc_minor, (void *)(uintptr_t)minor, 1);
2891ae08745Sheppo return (NULL);
2901ae08745Sheppo }
2911ae08745Sheppo
2921ae08745Sheppo mdsp = ddi_get_soft_state(mdesc_state_head, minor);
2931ae08745Sheppo
2941ae08745Sheppo if (devp != NULL) {
2951ae08745Sheppo major = getemajor(*devp);
2961ae08745Sheppo } else {
2971ae08745Sheppo major = ddi_driver_major(mdesc_devi);
2981ae08745Sheppo }
2991ae08745Sheppo
3001ae08745Sheppo mdsp->dev = makedevice(major, minor);
3011ae08745Sheppo
3021ae08745Sheppo if (devp != NULL)
3031ae08745Sheppo *devp = mdsp->dev;
3041ae08745Sheppo
3051ae08745Sheppo mdsp->instance = minor;
3061ae08745Sheppo
3071ae08745Sheppo mutex_init(&mdsp->lock, NULL, MUTEX_DRIVER, NULL);
3081ae08745Sheppo
3091ae08745Sheppo cv_init(&mdsp->cv, NULL, CV_DRIVER, NULL);
3101ae08745Sheppo
3111ae08745Sheppo mdsp->mdesc = md_get_handle();
3121ae08745Sheppo
3131ae08745Sheppo if (mdsp->mdesc == NULL) {
3141ae08745Sheppo mdesc_destroy_state(mdsp);
3151ae08745Sheppo return (NULL);
3161ae08745Sheppo }
3171ae08745Sheppo mdsp->flags |= MDESC_GOT_HANDLE;
3181ae08745Sheppo
3191ae08745Sheppo mdsp->mdesc_len = md_get_bin_size(mdsp->mdesc);
3201ae08745Sheppo
3211ae08745Sheppo if (mdsp->mdesc_len == 0) {
3221ae08745Sheppo mdesc_destroy_state(mdsp);
3231ae08745Sheppo mdsp = NULL;
3241ae08745Sheppo }
3251ae08745Sheppo
3261ae08745Sheppo return (mdsp);
3271ae08745Sheppo }
3287c478bd9Sstevel@tonic-gate
3297c478bd9Sstevel@tonic-gate
3307c478bd9Sstevel@tonic-gate /*ARGSUSED*/
3317c478bd9Sstevel@tonic-gate static int
mdesc_open(dev_t * devp,int flag,int otyp,cred_t * credp)3327c478bd9Sstevel@tonic-gate mdesc_open(dev_t *devp, int flag, int otyp, cred_t *credp)
3337c478bd9Sstevel@tonic-gate {
3347c478bd9Sstevel@tonic-gate struct mdesc_state *mdsp;
3357c478bd9Sstevel@tonic-gate
3361ae08745Sheppo if (otyp != OTYP_CHR)
3371ae08745Sheppo return (EINVAL);
3381ae08745Sheppo if (!mdesc_attached)
3397c478bd9Sstevel@tonic-gate return (ENXIO);
3407c478bd9Sstevel@tonic-gate
3411ae08745Sheppo mutex_enter(&mdesc_lock);
3427c478bd9Sstevel@tonic-gate
3431ae08745Sheppo if (mdesc_opens >= mdesc_max_opens) {
3441ae08745Sheppo mutex_exit(&mdesc_lock);
3451ae08745Sheppo return (ENXIO);
3461ae08745Sheppo }
3477c478bd9Sstevel@tonic-gate
3481ae08745Sheppo mdsp = mdesc_create_state(devp);
3491ae08745Sheppo
3501ae08745Sheppo if (mdsp == NULL) {
3511ae08745Sheppo mutex_exit(&mdesc_lock);
3521ae08745Sheppo return (ENXIO);
3531ae08745Sheppo }
3547c478bd9Sstevel@tonic-gate
3551ae08745Sheppo mdesc_opens++;
3567c478bd9Sstevel@tonic-gate
3571ae08745Sheppo mutex_exit(&mdesc_lock);
3587c478bd9Sstevel@tonic-gate
3591ae08745Sheppo return (0);
3601ae08745Sheppo }
3617c478bd9Sstevel@tonic-gate
3627c478bd9Sstevel@tonic-gate /*ARGSUSED*/
3637c478bd9Sstevel@tonic-gate static int
mdesc_close(dev_t dev,int flag,int otyp,cred_t * credp)3647c478bd9Sstevel@tonic-gate mdesc_close(dev_t dev, int flag, int otyp, cred_t *credp)
3657c478bd9Sstevel@tonic-gate {
3667c478bd9Sstevel@tonic-gate struct mdesc_state *mdsp;
3677c478bd9Sstevel@tonic-gate int instance = getminor(dev);
3687c478bd9Sstevel@tonic-gate
3691ae08745Sheppo if (otyp != OTYP_CHR)
3701ae08745Sheppo return (EINVAL);
3711ae08745Sheppo
3721ae08745Sheppo mutex_enter(&mdesc_lock);
3731ae08745Sheppo if (mdesc_opens == 0) {
3741ae08745Sheppo mutex_exit(&mdesc_lock);
3751ae08745Sheppo return (0);
3761ae08745Sheppo }
3771ae08745Sheppo mutex_exit(&mdesc_lock);
3781ae08745Sheppo
3797c478bd9Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, instance)) == NULL)
3807c478bd9Sstevel@tonic-gate return (ENXIO);
3817c478bd9Sstevel@tonic-gate
3827c478bd9Sstevel@tonic-gate ASSERT(mdsp->instance == instance);
3837c478bd9Sstevel@tonic-gate
3841ae08745Sheppo mdesc_destroy_state(mdsp);
3851ae08745Sheppo mutex_enter(&mdesc_lock);
3861ae08745Sheppo mdesc_opens--;
3871ae08745Sheppo mutex_exit(&mdesc_lock);
3887c478bd9Sstevel@tonic-gate
3897c478bd9Sstevel@tonic-gate return (0);
3907c478bd9Sstevel@tonic-gate }
3917c478bd9Sstevel@tonic-gate
3927c478bd9Sstevel@tonic-gate
3937c478bd9Sstevel@tonic-gate
3947c478bd9Sstevel@tonic-gate
3957c478bd9Sstevel@tonic-gate /*ARGSUSED*/
3967c478bd9Sstevel@tonic-gate static int
mdesc_read(dev_t dev,struct uio * uiop,cred_t * credp)3977c478bd9Sstevel@tonic-gate mdesc_read(dev_t dev, struct uio *uiop, cred_t *credp)
3987c478bd9Sstevel@tonic-gate {
3997c478bd9Sstevel@tonic-gate return (mdesc_rw(dev, uiop, UIO_READ));
4007c478bd9Sstevel@tonic-gate }
4017c478bd9Sstevel@tonic-gate
4027c478bd9Sstevel@tonic-gate
4037c478bd9Sstevel@tonic-gate
4047c478bd9Sstevel@tonic-gate
4057c478bd9Sstevel@tonic-gate /*ARGSUSED*/
4067c478bd9Sstevel@tonic-gate static int
mdesc_write(dev_t dev,struct uio * uiop,cred_t * credp)4077c478bd9Sstevel@tonic-gate mdesc_write(dev_t dev, struct uio *uiop, cred_t *credp)
4087c478bd9Sstevel@tonic-gate {
4097c478bd9Sstevel@tonic-gate return (ENXIO); /* This driver version does not allow updates */
4107c478bd9Sstevel@tonic-gate }
4117c478bd9Sstevel@tonic-gate
4127c478bd9Sstevel@tonic-gate
4137c478bd9Sstevel@tonic-gate
4147c478bd9Sstevel@tonic-gate
4157c478bd9Sstevel@tonic-gate static int
mdesc_rw(dev_t dev,struct uio * uiop,enum uio_rw rw)4167c478bd9Sstevel@tonic-gate mdesc_rw(dev_t dev, struct uio *uiop, enum uio_rw rw)
4177c478bd9Sstevel@tonic-gate {
4187c478bd9Sstevel@tonic-gate struct mdesc_state *mdsp;
4197c478bd9Sstevel@tonic-gate int instance = getminor(dev);
4207c478bd9Sstevel@tonic-gate size_t len;
4217c478bd9Sstevel@tonic-gate int retval;
4221ae08745Sheppo caddr_t buf;
4237c478bd9Sstevel@tonic-gate
4247c478bd9Sstevel@tonic-gate len = uiop->uio_resid;
4257c478bd9Sstevel@tonic-gate
4267c478bd9Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, instance)) == NULL)
4277c478bd9Sstevel@tonic-gate return (ENXIO);
4287c478bd9Sstevel@tonic-gate
4297c478bd9Sstevel@tonic-gate ASSERT(mdsp->instance == instance);
4307c478bd9Sstevel@tonic-gate
4317c478bd9Sstevel@tonic-gate if (len == 0)
4327c478bd9Sstevel@tonic-gate return (0);
4337c478bd9Sstevel@tonic-gate
4347c478bd9Sstevel@tonic-gate mutex_enter(&mdsp->lock);
4357c478bd9Sstevel@tonic-gate
4367c478bd9Sstevel@tonic-gate while (mdsp->flags & MDESC_BUSY) {
4377c478bd9Sstevel@tonic-gate if (cv_wait_sig(&mdsp->cv, &mdsp->lock) == 0) {
4387c478bd9Sstevel@tonic-gate mutex_exit(&mdsp->lock);
4397c478bd9Sstevel@tonic-gate return (EINTR);
4407c478bd9Sstevel@tonic-gate }
4417c478bd9Sstevel@tonic-gate }
4427c478bd9Sstevel@tonic-gate
4437c478bd9Sstevel@tonic-gate if (uiop->uio_offset < 0 || uiop->uio_offset > mdsp->mdesc_len) {
4447c478bd9Sstevel@tonic-gate mutex_exit(&mdsp->lock);
4457c478bd9Sstevel@tonic-gate return (EINVAL);
4467c478bd9Sstevel@tonic-gate }
4477c478bd9Sstevel@tonic-gate
4487c478bd9Sstevel@tonic-gate if (len > (mdsp->mdesc_len - uiop->uio_offset))
4497c478bd9Sstevel@tonic-gate len = mdsp->mdesc_len - uiop->uio_offset;
4507c478bd9Sstevel@tonic-gate
4517c478bd9Sstevel@tonic-gate /* already checked that offset<mdesc_len above */
4527c478bd9Sstevel@tonic-gate if (len == 0) {
4537c478bd9Sstevel@tonic-gate mutex_exit(&mdsp->lock);
4547c478bd9Sstevel@tonic-gate return (rw == UIO_WRITE ? ENOSPC : 0);
4557c478bd9Sstevel@tonic-gate }
4567c478bd9Sstevel@tonic-gate
4577c478bd9Sstevel@tonic-gate mdsp->flags |= MDESC_BUSY;
4587c478bd9Sstevel@tonic-gate mutex_exit(&mdsp->lock);
4597c478bd9Sstevel@tonic-gate
4601ae08745Sheppo buf = md_get_md_raw(mdsp->mdesc);
4611ae08745Sheppo if (buf == NULL)
4621ae08745Sheppo return (ENXIO);
4631ae08745Sheppo
4641ae08745Sheppo retval = uiomove((void *)(buf + uiop->uio_offset),
465*19397407SSherry Moore len, rw, uiop);
4667c478bd9Sstevel@tonic-gate
4677c478bd9Sstevel@tonic-gate mutex_enter(&mdsp->lock);
4687c478bd9Sstevel@tonic-gate mdsp->flags &= ~MDESC_BUSY;
4697c478bd9Sstevel@tonic-gate cv_broadcast(&mdsp->cv);
4707c478bd9Sstevel@tonic-gate mutex_exit(&mdsp->lock);
4717c478bd9Sstevel@tonic-gate
4727c478bd9Sstevel@tonic-gate return (retval);
4737c478bd9Sstevel@tonic-gate }
4747c478bd9Sstevel@tonic-gate
4757c478bd9Sstevel@tonic-gate
4767c478bd9Sstevel@tonic-gate
4777c478bd9Sstevel@tonic-gate
4787c478bd9Sstevel@tonic-gate /*ARGSUSED*/
4797c478bd9Sstevel@tonic-gate static int
mdesc_ioctl(dev_t dev,int cmd,intptr_t arg,int mode,cred_t * credp,int * rvalp)4807c478bd9Sstevel@tonic-gate mdesc_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp,
4817c478bd9Sstevel@tonic-gate int *rvalp)
4827c478bd9Sstevel@tonic-gate {
4837c478bd9Sstevel@tonic-gate struct mdesc_state *mdsp;
4847c478bd9Sstevel@tonic-gate int instance = getminor(dev);
4857c478bd9Sstevel@tonic-gate
4867c478bd9Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, instance)) == NULL)
4877c478bd9Sstevel@tonic-gate return (ENXIO);
4887c478bd9Sstevel@tonic-gate
4897c478bd9Sstevel@tonic-gate ASSERT(mdsp->instance == instance);
4907c478bd9Sstevel@tonic-gate
4917c478bd9Sstevel@tonic-gate switch (cmd) {
4927c478bd9Sstevel@tonic-gate case MDESCIOCGSZ: {
4937c478bd9Sstevel@tonic-gate /*
4947c478bd9Sstevel@tonic-gate * We are not guaranteed that ddi_copyout(9F) will read
4957c478bd9Sstevel@tonic-gate * atomically anything larger than a byte. Therefore we
4967c478bd9Sstevel@tonic-gate * must duplicate the size before copying it out to the user.
4977c478bd9Sstevel@tonic-gate */
4987c478bd9Sstevel@tonic-gate size_t sz = mdsp->mdesc_len;
4997c478bd9Sstevel@tonic-gate
5007c478bd9Sstevel@tonic-gate if (!(mode & FREAD))
5017c478bd9Sstevel@tonic-gate return (EACCES);
5027c478bd9Sstevel@tonic-gate
5037c478bd9Sstevel@tonic-gate #ifdef _MULTI_DATAMODEL
5047c478bd9Sstevel@tonic-gate switch (ddi_model_convert_from(mode & FMODELS)) {
5057c478bd9Sstevel@tonic-gate case DDI_MODEL_ILP32: {
5067c478bd9Sstevel@tonic-gate size32_t sz32 = (size32_t)sz;
5077c478bd9Sstevel@tonic-gate if (ddi_copyout(&sz32, (void *)arg, sizeof (size32_t),
5087c478bd9Sstevel@tonic-gate mode) != 0)
5097c478bd9Sstevel@tonic-gate return (EFAULT);
5107c478bd9Sstevel@tonic-gate return (0);
5117c478bd9Sstevel@tonic-gate }
5127c478bd9Sstevel@tonic-gate case DDI_MODEL_NONE:
5137c478bd9Sstevel@tonic-gate if (ddi_copyout(&sz, (void *)arg, sizeof (size_t),
5147c478bd9Sstevel@tonic-gate mode) != 0)
5157c478bd9Sstevel@tonic-gate return (EFAULT);
5167c478bd9Sstevel@tonic-gate return (0);
5177c478bd9Sstevel@tonic-gate default:
5187c478bd9Sstevel@tonic-gate cmn_err(CE_WARN,
5197c478bd9Sstevel@tonic-gate "mdesc: Invalid data model %d in ioctl\n",
5207c478bd9Sstevel@tonic-gate ddi_model_convert_from(mode & FMODELS));
5217c478bd9Sstevel@tonic-gate return (ENOTSUP);
5227c478bd9Sstevel@tonic-gate }
5237c478bd9Sstevel@tonic-gate #else /* ! _MULTI_DATAMODEL */
5247c478bd9Sstevel@tonic-gate if (ddi_copyout(&sz, (void *)arg, sizeof (size_t), mode) != 0)
5257c478bd9Sstevel@tonic-gate return (EFAULT);
5267c478bd9Sstevel@tonic-gate return (0);
5277c478bd9Sstevel@tonic-gate #endif /* _MULTI_DATAMODEL */
5287c478bd9Sstevel@tonic-gate }
5297c478bd9Sstevel@tonic-gate
5307c478bd9Sstevel@tonic-gate default:
5317c478bd9Sstevel@tonic-gate return (ENOTTY);
5327c478bd9Sstevel@tonic-gate }
5337c478bd9Sstevel@tonic-gate }
534