/* * 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. */ #ifndef _SYS_MDI_IMPLDEFS_H #define _SYS_MDI_IMPLDEFS_H #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #ifdef __cplusplus extern "C" { #endif #ifdef _KERNEL /* * Multipath Driver Interfaces * * The multipathing framework is provided in two modules. The 'mpxio' misc. * module provides the core multipath framework and the 'scsi_vhci' nexus * driver provides the SCSI-III command set driver functionality for * managing Fibre-Channel storage devices. * * As in any multipathing solution there are three major problems to solve: * * 1) Identification and enumeration of multipath client devices. * 2) Optimal path selection when routing I/O requests. * 3) Observability interfaces to snapshot the multipath configuration, * and infrastructure to provide performance and error statistics. * * The mpxio framework consists of several major components: * * 1) The MDI is the Multiplexed Device Interface; this is the core glue which * holds the following components together. * 2) vHCI (Virtual Host Controller Interconnect) drivers provide multipathing * services for a given bus technology (example: 'scsi_vhci' provides * multipathing support for SCSI-III fibre-channel devices). * 3) pHCI (Physical Host Controller Interconnect) drivers provide transport * services for a given host controller (example: 'fcp' provides transport * for fibre-channel devices). * 4) Client Devices are standard Solaris target (or leaf) drivers * (example: 'ssd' is the standard disk driver for fibre-channel arrays). * 5) Multipath information nodes ('pathinfo' nodes) connect client device * nodes and pHCI device nodes in the device tree. * * With the scsi_vhci, a QLC card, and mpxio enabled, the device tree might * look like this: * * +-----------+ +-----------+ * | scsi_vhci | | pci@1f,0 | * +-----------+ +-----------+ * / \ \ * +----------+ +-----------+ +-------------+ * | ssd1 | | ssd2 | | qlc@0,0 | * +----------+ +-----------+ +-------------+ * | | / \ * | | +-------------+ +------------+ * | | | pHCI 1 | | pHCI 2 | * | | +-------------+ +------------+ * | | / | / | * | | +------+ | +------+ | * | | | ssd | | | ssd | | * | | | (OBP)| | | (OBP)| | * | | +------+ | +------+ | * | | | | * | | +-------+ +--------+ * | +-------------->| path |---------->| path | * | | info | | info | * | | node 1| | node 3 | * | +-------+ +--------+ * | | | * | +-------+ +--------+ * +------------------------->| path |---------->| path | * | info | | info | * | node 2| | node 4 | * +-------+ +--------+ * * The multipath information nodes (mdi_pathinfo nodes) establish the * relationship between the pseudo client driver instance nodes and the * physical host controller interconnect (pHCI drivers) forming a matrix * structure. * * The mpxio module implements locking at multiple granularity levels to * support the needs of various consumers. The multipath matrix can be * globally locked, column locked, or row locked depending on the consumer. * The intention is to balance simplicity and performance. * * Locking: * * The current implementation utilizes the following locks: * * mdi_mutex: protects the vHCI list, per-vHCI structure and the * list of pHCIs and Client devices registered against them (protection * against multi-threaded add/remove). * * devinfo_tree_lock (rw): protects system wide creation/removal of * mdi_pathinfo nodes into the multipath matrix. Consumers (like the devinfo * driver) can freeze the configuration by acquiring this as a reader. * * per-pHCI (mutex) lock: protects the column (pHCI-mdi_pathinfo node list) * and per-pHCI structure fields. mdi_pathinfo node creation, deletion and * child mdi_pathinfo node state changes are serialized on per pHCI basis * (Protection against DR). * * per-client (mutex) lock: protects the row (client-mdi_pathinfo node list) * and per-client structure fields. The client-mdi_pathinfo node list is * typically walked to select an optimal path when routing I/O requests. * * per-mdi_pathinfo (mutex) lock: protects the mdi_pathinfo node structure * fields. * * Note that per-Client structure and per-pHCI fields are freely readable when * corresponding mdi_pathinfo locks are held, since holding an mdi_pathinfo * node guarantees that its corresponding client and pHCI devices will not be * freed. */ /* * MDI Client global unique identifier property name string definition */ extern const char *mdi_client_guid_prop; #define MDI_CLIENT_GUID_PROP (char *)mdi_client_guid_prop /* * MDI Client load balancing policy definitions * * Load balancing policies are determined on a per-vHCI basis and are * configurable via the vHCI's driver.conf file. */ typedef enum { LOAD_BALANCE_NONE, /* Alternate pathing */ LOAD_BALANCE_RR, /* Round Robin */ LOAD_BALANCE_LBA /* Logical Block Addressing */ } client_lb_t; typedef struct { int region_size; }client_lb_args_t; /* * MDI client load balancing property name/value string definitions */ extern const char *mdi_load_balance; extern const char *mdi_load_balance_none; extern const char *mdi_load_balance_ap; extern const char *mdi_load_balance_rr; extern const char *mdi_load_balance_lba; #define LOAD_BALANCE_PROP (char *)mdi_load_balance #define LOAD_BALANCE_PROP_NONE (char *)mdi_load_balance_none #define LOAD_BALANCE_PROP_AP (char *)mdi_load_balance_ap #define LOAD_BALANCE_PROP_RR (char *)mdi_load_balance_rr #define LOAD_BALANCE_PROP_LBA (char *)mdi_load_balance_lba /* default for region size */ #define LOAD_BALANCE_DEFAULT_REGION_SIZE 18 /* * vHCI drivers: * * vHCI drivers are pseudo nexus drivers which implement multipath services * for a specific command set or bus architecture ('class'). There is a * single instance of the vHCI driver for each command set which supports * multipath devices. * * Each vHCI driver registers the following callbacks from attach(9e). */ #define MDI_VHCI_OPS_REV_1 1 /* * Change MDI_VHCI_OPS_REV_NAME as per MDI_VHCI_OPS_REV */ #define MDI_VHCI_OPS_REV MDI_VHCI_OPS_REV_1 #define MDI_VHCI_OPS_REV_NAME "1" typedef struct mdi_vhci_ops { /* revision management */ int vo_revision; /* mdi_pathinfo node init callback */ int (*vo_pi_init)(dev_info_t *vdip, mdi_pathinfo_t *pip, int flags); /* mdi_pathinfo node uninit callback */ int (*vo_pi_uninit)(dev_info_t *vdip, mdi_pathinfo_t *pip, int flags); /* mdi_pathinfo node state change callback */ int (*vo_pi_state_change)(dev_info_t *vdip, mdi_pathinfo_t *pip, mdi_pathinfo_state_t state, uint32_t, int flags); /* Client path failover callback */ int (*vo_failover)(dev_info_t *vdip, dev_info_t *cdip, int flags); } mdi_vhci_ops_t; /* * An mdi_vhci structure is created and bound to the devinfo node of every * registered vHCI class driver; this happens when a vHCI registers itself from * attach(9e). This structure is unbound and freed when the vHCI unregisters * at detach(9e) time; * * Each vHCI driver is associated with a vHCI class name; this is the handle * used to register and unregister pHCI drivers for a given transport. * * Locking: This structure is guarded by the mdi_mutex; however, depending * on the context, some of the fields can be freely read without holding any * locks (ex. holding a child's lock also guarantees that the vHCI (parent) * cannot be unexpectedly freed). */ typedef struct mdi_vhci { struct mdi_vhci *vh_next; /* next link */ struct mdi_vhci *vh_prev; /* prev link */ int vh_flags; /* Operation flags */ dev_info_t *vh_dip; /* devi handle */ char *vh_class; /* Class name */ struct mdi_vhci_ops *vh_ops; /* Callback vectors */ client_lb_t vh_lb; /* Global cache */ int vh_phci_count; /* pHCI device count */ struct mdi_phci *vh_phci_head; /* pHCI list head */ struct mdi_phci *vh_phci_tail; /* pHCI list tail */ int vh_client_count; /* Client count */ struct client_hash *vh_client_table; /* Client hash */ int vh_refcnt; /* reference count */ struct mdi_vhci_config *vh_config; /* vhci config */ } mdi_vhci_t; /* * GUID Hash definitions * * Since all the mpxio managed devices for a given class are enumerated under * the single vHCI instance for that class, sequentially walking through the * client device link to find a client would be prohibitively slow. */ #define CLIENT_HASH_TABLE_SIZE (32) /* GUID hash */ /* * Client hash table structure */ struct client_hash { struct mdi_client *ct_hash_head; /* Client hash head */ int ct_hash_count; /* Client hash count */ }; /* * pHCI Drivers: * * Physical HBA drivers provide transport services for mpxio-managed devices. * As each pHCI instance is attached, it must register itself with the mpxio * framework using mdi_phci_register(). When the pHCI is detached it must * similarly call mdi_phci_unregister(). * * The framework maintains a list of registered pHCI device instances for each * vHCI. This list is vHCI->vh_phci_count, vHCI->vh_phci_head, * vHCI->vh_phci_tail and pHCI->ph_next. This list is protected by the global * mdi_mutex. * * Locking order: * * _NOTE(LOCK_ORDER(mdi_mutex, mdi_phci::ph_mutex)) * _NOTE(LOCK_ORDER(mdi_phci::ph_mutex devinfo_tree_lock)) */ typedef struct mdi_phci { kmutex_t ph_mutex; /* per-pHCI mutex */ struct mdi_phci *ph_next; /* next link */ struct mdi_phci *ph_prev; /* prev link */ dev_info_t *ph_dip; /* devi handle */ struct mdi_vhci *ph_vhci; /* back ref. to vHCI */ int ph_flags; /* pHCI operation flags */ int ph_path_count; /* child pi count */ mdi_pathinfo_t *ph_path_head; /* pi list head */ mdi_pathinfo_t *ph_path_tail; /* pi list tail */ int ph_unstable; /* Paths in transient state */ kcondvar_t ph_unstable_cv; /* Paths in transient state */ kcondvar_t ph_powerchange_cv; /* Paths in transient state */ void *ph_vprivate; /* vHCI driver private */ } mdi_phci_t; /* * A pHCI device is 'unstable' while one or more paths are in a transitional * state. Hotplugging is prevented during this state. */ #define MDI_PHCI_UNSTABLE(ph) (ph)->ph_unstable++; #define MDI_PHCI_STABLE(ph) { \ (ph)->ph_unstable--; \ if ((ph)->ph_unstable == 0) { \ cv_broadcast(&(ph)->ph_unstable_cv); \ } \ } /* * per-pHCI lock macros */ #define MDI_PHCI_LOCK(ph) mutex_enter(&((ph))->ph_mutex) #define MDI_PHCI_TRYLOCK(ph) mutex_tryenter(&((ph))->ph_mutex) #define MDI_PHCI_UNLOCK(ph) mutex_exit(&((ph))->ph_mutex) /* * pHCI state definitions and macros to track the pHCI driver instance state */ #define MDI_PHCI_FLAGS_OFFLINE 0x1 /* pHCI is offline */ #define MDI_PHCI_FLAGS_SUSPEND 0x2 /* pHCI is suspended */ #define MDI_PHCI_FLAGS_POWER_DOWN 0x4 /* pHCI is power down */ #define MDI_PHCI_FLAGS_DETACH 0x8 /* pHCI is detached */ #define MDI_PHCI_FLAGS_USER_DISABLE 0x10 /* pHCI is disabled,user */ #define MDI_PHCI_FLAGS_D_DISABLE 0x20 /* pHCI is disabled,driver */ #define MDI_PHCI_FLAGS_D_DISABLE_TRANS 0x40 /* pHCI is disabled,transient */ #define MDI_PHCI_FLAGS_POWER_TRANSITION 0x80 /* pHCI is power transition */ #define MDI_PHCI_DISABLE_MASK (~(MDI_PHCI_FLAGS_USER_DISABLE | \ MDI_PHCI_FLAGS_D_DISABLE | \ MDI_PHCI_FLAGS_D_DISABLE_TRANS)) #define MDI_PHCI_IS_READY(ph) \ (((ph)->ph_flags & (MDI_PHCI_DISABLE_MASK)) == 0) #define MDI_PHCI_SET_OFFLINE(ph) \ ((ph)->ph_flags |= MDI_PHCI_FLAGS_OFFLINE) #define MDI_PHCI_SET_ONLINE(ph) \ ((ph)->ph_flags &= ~MDI_PHCI_FLAGS_OFFLINE) #define MDI_PHCI_SET_SUSPEND(ph) \ ((ph)->ph_flags |= MDI_PHCI_FLAGS_SUSPEND) #define MDI_PHCI_SET_RESUME(ph) \ ((ph)->ph_flags &= ~MDI_PHCI_FLAGS_SUSPEND) #define MDI_PHCI_IS_OFFLINE(ph) \ ((ph)->ph_flags & MDI_PHCI_FLAGS_OFFLINE) #define MDI_PHCI_IS_SUSPENDED(ph) \ ((ph)->ph_flags & MDI_PHCI_FLAGS_SUSPEND) #define MDI_PHCI_SET_DETACH(ph) \ ((ph)->ph_flags |= MDI_PHCI_FLAGS_DETACH) #define MDI_PHCI_SET_ATTACH(ph) \ ((ph)->ph_flags &= ~MDI_PHCI_FLAGS_DETACH) #define MDI_PHCI_SET_POWER_DOWN(ph) \ ((ph)->ph_flags |= MDI_PHCI_FLAGS_POWER_DOWN) #define MDI_PHCI_SET_POWER_UP(ph) \ ((ph)->ph_flags &= ~MDI_PHCI_FLAGS_POWER_DOWN) #define MDI_PHCI_SET_USER_ENABLE(ph) \ ((ph)->ph_flags &= ~MDI_PHCI_FLAGS_USER_DISABLE) #define MDI_PHCI_SET_USER_DISABLE(ph) \ ((ph)->ph_flags |= MDI_PHCI_FLAGS_USER_DISABLE) #define MDI_PHCI_SET_DRV_ENABLE(ph) \ ((ph)->ph_flags &= ~MDI_PHCI_FLAGS_D_DISABLE) #define MDI_PHCI_SET_DRV_DISABLE(ph) \ ((ph)->ph_flags |= MDI_PHCI_FLAGS_D_DISABLE) #define MDI_PHCI_SET_DRV_ENABLE_TRANSIENT(ph) \ ((ph)->ph_flags &= ~MDI_PHCI_FLAGS_D_DISABLE_TRANS) #define MDI_PHCI_SET_DRV_DISABLE_TRANSIENT(ph) \ ((ph)->ph_flags |= MDI_PHCI_FLAGS_D_DISABLE_TRANS) #define MDI_PHCI_IS_USER_DISABLED(ph) \ ((ph)->ph_flags & MDI_PHCI_FLAGS_USER_DISABLE) #define MDI_PHCI_IS_DRV_DISABLED_TRANSIENT(ph) \ ((ph)->ph_flags & MDI_PHCI_FLAGS_D_DISABLE_TRANS) #define MDI_PHCI_IS_DRV_DISABLED(ph) \ ((ph)->ph_flags & MDI_PHCI_FLAGS_D_DISABLE) #define MDI_PHCI_IS_POWERED_DOWN(ph) \ ((ph)->ph_flags & MDI_PHCI_FLAGS_POWER_DOWN) #define MDI_PHCI_SET_POWER_TRANSITION(ph) \ ((ph)->ph_flags |= MDI_PHCI_FLAGS_POWER_TRANSITION) #define MDI_PHCI_CLEAR_POWER_TRANSITION(ph) \ ((ph)->ph_flags &= ~MDI_PHCI_FLAGS_POWER_TRANSITION) #define MDI_PHCI_IS_POWER_TRANSITION(ph) \ ((ph)->ph_flags & MDI_PHCI_FLAGS_POWER_TRANSITION) /* * mpxio Managed Clients: * * This framework creates a struct mdi_client for every client device created * by the framework as a result of self-enumeration of target devices by the * registered pHCI devices. This structure is bound to client device dev_info * node at the time of client device allocation (ndi_devi_alloc(9e)). This * structure is unbound from the dev_info node when mpxio framework removes a * client device node from the system. * * This structure is created when a first path is enumerated and removed when * last path is de-enumerated from the system. * * Multipath client devices are instantiated as children of corresponding vHCI * driver instance. Each client device is uniquely identified by a GUID * provided by target device itself. The parent vHCI device also maintains a * hashed list of client devices, protected by the global mdi_mutex. * * Typically pHCI devices self-enumerate their child devices using taskq, * resulting in multiple paths to the same client device to be enumerated by * competing threads. mdi_mutex is also used to serialize the client device * creation. * * Currently this framework supports two kinds of load-balancing policy * configurable through the vHCI driver configuration files. * * NONE - Legacy AP mode * Round Robin - Balance the pHCI load in a Round Robin fashion. * * This framework identifies the client device in three distinct states: * * OPTIMAL - Client device has atleast one redundant path. * DEGRADED - No redundant paths (critical). Failure in the current active * path would result in data access failures. * FAILED - No paths are available to access this device. * * Locking order: * * _NOTE(LOCK_ORDER(mdi_mutex, mdi_client::ct_mutex)) * _NOTE(LOCK_ORDER(mdi_client::ct_mutex devinfo_tree_lock)) */ typedef struct mdi_client { kmutex_t ct_mutex; /* per-client mutex */ struct mdi_client *ct_hnext; /* next client */ struct mdi_client *ct_hprev; /* prev client */ dev_info_t *ct_dip; /* client devi handle */ struct mdi_vhci *ct_vhci; /* vHCI back ref */ char *ct_drvname; /* client driver name */ char *ct_guid; /* client guid */ void *ct_cprivate; /* client driver private */ client_lb_t ct_lb; /* load balancing scheme */ client_lb_args_t *ct_lb_args; /* load balancing args */ int ct_flags; /* Driver op. flags */ int ct_state; /* state information */ int ct_failover_flags; /* Failover args */ int ct_failover_status; /* last fo status */ kcondvar_t ct_failover_cv; /* Failover status cv */ int ct_path_count; /* multi path count */ mdi_pathinfo_t *ct_path_head; /* multi path list head */ mdi_pathinfo_t *ct_path_tail; /* multi path list tail */ mdi_pathinfo_t *ct_path_last; /* last path used for i/o */ int ct_unstable; /* Paths in transient state */ kcondvar_t ct_unstable_cv; /* Paths in transient state */ int ct_power_cnt; /* Hold count on parent power */ kcondvar_t ct_powerchange_cv; /* Paths in power transient state */ int ct_powercnt_held; /* ct_power_cnt held in pre_unconfig */ int ct_powercnt_reset; /* ct_power_cnt was resetted */ void *ct_vprivate; /* vHCI driver private */ } mdi_client_t; /* * per-Client device locking definitions */ #define MDI_CLIENT_LOCK(ct) mutex_enter(&((ct))->ct_mutex) #define MDI_CLIENT_TRYLOCK(ct) mutex_tryenter(&((ct))->ct_mutex) #define MDI_CLIENT_UNLOCK(ct) mutex_exit(&((ct))->ct_mutex) /* * A Client device is in unstable while one or more paths are in transitional * state. We do not allow failover to take place while paths are in transient * state. Similarly we do not allow state transition while client device * failover is in progress. */ #define MDI_CLIENT_UNSTABLE(ct) (ct)->ct_unstable++; #define MDI_CLIENT_STABLE(ct) { \ (ct)->ct_unstable--; \ if ((ct)->ct_unstable == 0) { \ cv_broadcast(&(ct)->ct_unstable_cv); \ } \ } /* * Client driver instance state definitions: */ #define MDI_CLIENT_FLAGS_OFFLINE 0x00000001 #define MDI_CLIENT_FLAGS_SUSPEND 0x00000002 #define MDI_CLIENT_FLAGS_POWER_DOWN 0x00000004 #define MDI_CLIENT_FLAGS_DETACH 0x00000008 #define MDI_CLIENT_FLAGS_FAILOVER 0x00000010 #define MDI_CLIENT_FLAGS_REPORT_DEV 0x00000020 #define MDI_CLIENT_FLAGS_PATH_FREE_IN_PROGRESS 0x00000040 #define MDI_CLIENT_FLAGS_ASYNC_FREE 0x00000080 #define MDI_CLIENT_FLAGS_DEV_NOT_SUPPORTED 0x00000100 #define MDI_CLIENT_FLAGS_POWER_TRANSITION 0x00000200 #define MDI_CLIENT_SET_OFFLINE(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_OFFLINE) #define MDI_CLIENT_SET_ONLINE(ct) \ ((ct)->ct_flags &= ~MDI_CLIENT_FLAGS_OFFLINE) #define MDI_CLIENT_IS_OFFLINE(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_OFFLINE) #define MDI_CLIENT_SET_SUSPEND(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_SUSPEND) #define MDI_CLIENT_SET_RESUME(ct) \ ((ct)->ct_flags &= ~MDI_CLIENT_FLAGS_SUSPEND) #define MDI_CLIENT_IS_SUSPENDED(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_SUSPEND) #define MDI_CLIENT_SET_POWER_DOWN(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_POWER_DOWN) #define MDI_CLIENT_SET_POWER_UP(ct) \ ((ct)->ct_flags &= ~MDI_CLIENT_FLAGS_POWER_DOWN) #define MDI_CLIENT_IS_POWERED_DOWN(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_POWER_DOWN) #define MDI_CLIENT_SET_POWER_TRANSITION(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_POWER_TRANSITION) #define MDI_CLIENT_CLEAR_POWER_TRANSITION(ct) \ ((ct)->ct_flags &= ~MDI_CLIENT_FLAGS_POWER_TRANSITION) #define MDI_CLIENT_IS_POWER_TRANSITION(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_POWER_TRANSITION) #define MDI_CLIENT_SET_DETACH(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_DETACH) #define MDI_CLIENT_SET_ATTACH(ct) \ ((ct)->ct_flags &= ~MDI_CLIENT_FLAGS_DETACH) #define MDI_CLIENT_IS_DETACHED(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_DETACH) #define MDI_CLIENT_SET_FAILOVER_IN_PROGRESS(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_FAILOVER) #define MDI_CLIENT_CLEAR_FAILOVER_IN_PROGRESS(ct) \ ((ct)->ct_flags &= ~MDI_CLIENT_FLAGS_FAILOVER) #define MDI_CLIENT_IS_FAILOVER_IN_PROGRESS(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_FAILOVER) #define MDI_CLIENT_SET_REPORT_DEV_NEEDED(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_REPORT_DEV) #define MDI_CLIENT_CLEAR_REPORT_DEV_NEEDED(ct) \ ((ct)->ct_flags &= ~MDI_CLIENT_FLAGS_REPORT_DEV) #define MDI_CLIENT_IS_REPORT_DEV_NEEDED(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_REPORT_DEV) #define MDI_CLIENT_SET_PATH_FREE_IN_PROGRESS(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_PATH_FREE_IN_PROGRESS) #define MDI_CLIENT_CLEAR_PATH_FREE_IN_PROGRESS(ct) \ ((ct)->ct_flags &= ~MDI_CLIENT_FLAGS_PATH_FREE_IN_PROGRESS) #define MDI_CLIENT_IS_PATH_FREE_IN_PROGRESS(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_PATH_FREE_IN_PROGRESS) #define MDI_CLIENT_SET_DEV_NOT_SUPPORTED(ct) \ ((ct)->ct_flags |= MDI_CLIENT_FLAGS_DEV_NOT_SUPPORTED) #define MDI_CLIENT_IS_DEV_NOT_SUPPORTED(ct) \ ((ct)->ct_flags & MDI_CLIENT_FLAGS_DEV_NOT_SUPPORTED) /* * Client operating states. */ #define MDI_CLIENT_STATE_OPTIMAL 1 #define MDI_CLIENT_STATE_DEGRADED 2 #define MDI_CLIENT_STATE_FAILED 3 #define MDI_CLIENT_STATE(ct) ((ct)->ct_state) #define MDI_CLIENT_SET_STATE(ct, state) ((ct)->ct_state = state) #define MDI_CLIENT_IS_FAILED(ct) \ ((ct)->ct_state == MDI_CLIENT_STATE_FAILED) /* * mdi_pathinfo nodes: * * From this framework's perspective, a 'path' is a tuple consisting of a * client or end device, a host controller which provides device * identification and transport services (pHCI), and bus specific unit * addressing information. A path may be decorated with properties which * describe the capabilities of the path; such properties are analogous to * device node and minor node properties. * * The framework maintains link list of mdi_pathinfo nodes created by every * pHCI driver instance via the pi_phci_link linkage; this is used (for example) * to make sure that all relevant pathinfo nodes are freed before the pHCI * is unregistered. * * Locking order: * * _NOTE(LOCK_ORDER(mdi_phci::ph_mutex mdi_pathinfo::pi_mutex)) * _NOTE(LOCK_ORDER(mdi_client::ct_mutex mdi_pathinfo::pi_mutex)) * _NOTE(LOCK_ORDER(mdi_phci::ph_mutex mdi_client::ct_mutex)) * _NOTE(LOCK_ORDER(devinfo_tree_lock mdi_pathinfo::pi_mutex)) * * mdi_pathinfo node structure definition */ struct mdi_pathinfo { kmutex_t pi_mutex; /* per path mutex */ mdi_pathinfo_state_t pi_state; /* path state */ mdi_pathinfo_state_t pi_old_state; /* path state */ kcondvar_t pi_state_cv; /* path state condvar */ mdi_client_t *pi_client; /* client */ mdi_phci_t *pi_phci; /* pHCI dev_info node */ char *pi_addr; /* path unit address */ nvlist_t *pi_prop; /* Properties */ void *pi_cprivate; /* client private info */ void *pi_pprivate; /* phci private info */ struct mdi_pathinfo *pi_client_link; /* next path in client list */ struct mdi_pathinfo *pi_phci_link; /* next path in phci list */ int pi_ref_cnt; /* pi reference count */ kcondvar_t pi_ref_cv; /* condition variable */ struct mdi_pi_kstats *pi_kstats; /* aggregate kstats */ int pi_pm_held; /* phci's kidsup incremented */ int pi_preferred; /* Preferred path */ void *pi_vprivate; /* vhci private info */ }; /* * pathinfo statistics: * * The mpxio architecture allows for multiple pathinfo nodes for each * client-pHCI combination. For statistics purposes, these statistics are * aggregated into a single client-pHCI set of kstats. */ struct mdi_pi_kstats { int pi_kstat_ref; /* # paths aggregated, also a ref cnt */ kstat_t *pi_kstat_iostats; /* mdi:iopath statistic set */ kstat_t *pi_kstat_errstats; /* error statistics */ }; /* * pathinfo error kstat */ struct pi_errs { struct kstat_named pi_softerrs; /* "Soft" Error */ struct kstat_named pi_harderrs; /* "Hard" Error */ struct kstat_named pi_transerrs; /* Transport Errors */ struct kstat_named pi_icnt_busy; /* Interconnect Busy */ struct kstat_named pi_icnt_errors; /* Interconnect Errors */ struct kstat_named pi_phci_rsrc; /* pHCI No Resources */ struct kstat_named pi_phci_localerr; /* pHCI Local Errors */ struct kstat_named pi_phci_invstate; /* pHCI Invalid State */ struct kstat_named pi_failedfrom; /* Failover: Failed From */ struct kstat_named pi_failedto; /* Failover: Failed To */ }; /* * increment an error counter */ #define MDI_PI_ERRSTAT(pip, x) { \ if (MDI_PI((pip))->pi_kstats != NULL) { \ struct pi_errs *pep; \ pep = MDI_PI(pip)->pi_kstats->pi_kstat_errstats->ks_data; \ pep->x.value.ui32++; \ } \ } /* * error codes which can be passed to MDI_PI_ERRSTAT */ #define MDI_PI_SOFTERR pi_softerrs #define MDI_PI_HARDERR pi_harderrs #define MDI_PI_TRANSERR pi_transerrs #define MDI_PI_ICNTBUSY pi_icnt_busy #define MDI_PI_ICNTERR pi_icnt_errors #define MDI_PI_PHCIRSRC pi_phci_rsrc #define MDI_PI_PHCILOCL pi_phci_localerr #define MDI_PI_PHCIINVS pi_phci_invstate #define MDI_PI_FAILFROM pi_failedfrom #define MDI_PI_FAILTO pi_failedto #define MDI_PI(type) ((struct mdi_pathinfo *)(type)) #define MDI_PI_LOCK(pip) mutex_enter(&MDI_PI((pip))->pi_mutex) #define MDI_PI_UNLOCK(pip) mutex_exit(&MDI_PI((pip))->pi_mutex) #define MDI_PI_HOLD(pip) (++MDI_PI((pip))->pi_ref_cnt) #define MDI_PI_RELE(pip) (--MDI_PI((pip))->pi_ref_cnt) #define MDI_EXT_STATE_CHANGE 0x10000000 #define MDI_DISABLE_OP 0x1 #define MDI_ENABLE_OP 0x2 #define MDI_BEFORE_STATE_CHANGE 0x4 #define MDI_AFTER_STATE_CHANGE 0x8 #define MDI_SYNC_FLAG 0x10 #define MDI_PI_STATE(pip) \ (MDI_PI((pip))->pi_state & MDI_PATHINFO_STATE_MASK) #define MDI_PI_OLD_STATE(pip) \ (MDI_PI((pip))->pi_old_state & MDI_PATHINFO_STATE_MASK) #define MDI_PI_EXT_STATE(pip) \ (MDI_PI((pip))->pi_state & MDI_PATHINFO_EXT_STATE_MASK) #define MDI_PI_OLD_EXT_STATE(pip) \ (MDI_PI((pip))->pi_old_state & MDI_PATHINFO_EXT_STATE_MASK) #define MDI_PI_SET_TRANSIENT(pip) \ (MDI_PI(pip)->pi_state |= MDI_PATHINFO_STATE_TRANSIENT) #define MDI_PI_CLEAR_TRANSIENT(pip) \ (MDI_PI(pip)->pi_state &= ~MDI_PATHINFO_STATE_TRANSIENT) #define MDI_PI_IS_TRANSIENT(pip) \ (MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_TRANSIENT) #define MDI_PI_SET_USER_DISABLE(pip) \ (MDI_PI(pip)->pi_state |= MDI_PATHINFO_STATE_USER_DISABLE) #define MDI_PI_SET_DRV_DISABLE(pip) \ (MDI_PI(pip)->pi_state |= MDI_PATHINFO_STATE_DRV_DISABLE) #define MDI_PI_SET_DRV_DISABLE_TRANS(pip) \ (MDI_PI(pip)->pi_state |= MDI_PATHINFO_STATE_DRV_DISABLE_TRANSIENT) #define MDI_PI_SET_USER_ENABLE(pip) \ (MDI_PI(pip)->pi_state &= ~MDI_PATHINFO_STATE_USER_DISABLE) #define MDI_PI_SET_DRV_ENABLE(pip) \ (MDI_PI(pip)->pi_state &= ~MDI_PATHINFO_STATE_DRV_DISABLE) #define MDI_PI_SET_DRV_ENABLE_TRANS(pip) \ (MDI_PI(pip)->pi_state &= ~MDI_PATHINFO_STATE_DRV_DISABLE_TRANSIENT) #define MDI_PI_IS_USER_DISABLE(pip) \ (MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_USER_DISABLE) #define MDI_PI_IS_DRV_DISABLE(pip) \ (MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_DRV_DISABLE) #define MDI_PI_IS_DRV_DISABLE_TRANSIENT(pip) \ (MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_DRV_DISABLE_TRANSIENT) #define MDI_PI_IS_DISABLE(pip) \ (MDI_PI_IS_USER_DISABLE(pip) || \ MDI_PI_IS_DRV_DISABLE(pip) || \ MDI_PI_IS_DRV_DISABLE_TRANSIENT(pip)) #define MDI_PI_IS_INIT(pip) \ ((MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_MASK) == \ MDI_PATHINFO_STATE_INIT) #define MDI_PI_IS_INITING(pip) \ ((MDI_PI(pip)->pi_state & ~MDI_PATHINFO_EXT_STATE_MASK) == \ (MDI_PATHINFO_STATE_INIT | MDI_PATHINFO_STATE_TRANSIENT)) #define MDI_PI_SET_INIT(pip) \ (MDI_PI(pip)->pi_state = MDI_PATHINFO_STATE_INIT) #define MDI_PI_SET_ONLINING(pip) { \ uint32_t ext_state; \ ext_state = MDI_PI(pip)->pi_state & MDI_PATHINFO_EXT_STATE_MASK; \ MDI_PI(pip)->pi_old_state = MDI_PI_STATE(pip); \ MDI_PI(pip)->pi_state = \ (MDI_PATHINFO_STATE_ONLINE | MDI_PATHINFO_STATE_TRANSIENT); \ MDI_PI(pip)->pi_state |= ext_state; \ } #define MDI_PI_IS_ONLINING(pip) \ ((MDI_PI(pip)->pi_state & ~MDI_PATHINFO_EXT_STATE_MASK) == \ (MDI_PATHINFO_STATE_ONLINE | MDI_PATHINFO_STATE_TRANSIENT)) #define MDI_PI_SET_ONLINE(pip) { \ uint32_t ext_state; \ ext_state = MDI_PI(pip)->pi_state & MDI_PATHINFO_EXT_STATE_MASK; \ MDI_PI(pip)->pi_state = MDI_PATHINFO_STATE_ONLINE; \ MDI_PI(pip)->pi_state |= ext_state; \ } #define MDI_PI_IS_ONLINE(pip) \ ((MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_MASK) == \ MDI_PATHINFO_STATE_ONLINE) #define MDI_PI_SET_OFFLINING(pip) { \ uint32_t ext_state; \ ext_state = MDI_PI(pip)->pi_state & MDI_PATHINFO_EXT_STATE_MASK; \ MDI_PI(pip)->pi_old_state = MDI_PI_STATE(pip); \ MDI_PI(pip)->pi_state = \ (MDI_PATHINFO_STATE_OFFLINE | MDI_PATHINFO_STATE_TRANSIENT); \ MDI_PI(pip)->pi_state |= ext_state; \ } #define MDI_PI_IS_OFFLINING(pip) \ ((MDI_PI(pip)->pi_state & ~MDI_PATHINFO_EXT_STATE_MASK) == \ (MDI_PATHINFO_STATE_OFFLINE | MDI_PATHINFO_STATE_TRANSIENT)) #define MDI_PI_SET_OFFLINE(pip) { \ uint32_t ext_state; \ ext_state = MDI_PI(pip)->pi_state & MDI_PATHINFO_EXT_STATE_MASK; \ MDI_PI(pip)->pi_state = MDI_PATHINFO_STATE_OFFLINE; \ MDI_PI(pip)->pi_state |= ext_state; \ } #define MDI_PI_IS_OFFLINE(pip) \ ((MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_MASK) == \ MDI_PATHINFO_STATE_OFFLINE) #define MDI_PI_SET_STANDBYING(pip) { \ uint32_t ext_state; \ ext_state = MDI_PI(pip)->pi_state & MDI_PATHINFO_EXT_STATE_MASK; \ MDI_PI(pip)->pi_old_state = MDI_PI_STATE(pip); \ MDI_PI(pip)->pi_state = \ (MDI_PATHINFO_STATE_STANDBY | MDI_PATHINFO_STATE_TRANSIENT); \ MDI_PI(pip)->pi_state |= ext_state; \ } #define MDI_PI_SET_STANDBY(pip) { \ uint32_t ext_state; \ ext_state = MDI_PI(pip)->pi_state & MDI_PATHINFO_EXT_STATE_MASK; \ MDI_PI(pip)->pi_state = MDI_PATHINFO_STATE_STANDBY; \ MDI_PI(pip)->pi_state |= ext_state; \ } #define MDI_PI_IS_STANDBY(pip) \ ((MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_MASK) == \ MDI_PATHINFO_STATE_STANDBY) #define MDI_PI_SET_FAULTING(pip) { \ uint32_t ext_state; \ ext_state = MDI_PI(pip)->pi_state & MDI_PATHINFO_EXT_STATE_MASK; \ MDI_PI(pip)->pi_old_state = MDI_PI_STATE(pip); \ MDI_PI(pip)->pi_state = \ (MDI_PATHINFO_STATE_FAULT | MDI_PATHINFO_STATE_TRANSIENT); \ MDI_PI(pip)->pi_state |= ext_state; \ } #define MDI_PI_SET_FAULT(pip) { \ uint32_t ext_state; \ ext_state = MDI_PI(pip)->pi_state & MDI_PATHINFO_EXT_STATE_MASK; \ MDI_PI(pip)->pi_state = MDI_PATHINFO_STATE_FAULT; \ MDI_PI(pip)->pi_state |= ext_state; \ } #define MDI_PI_IS_FAULT(pip) \ ((MDI_PI(pip)->pi_state & MDI_PATHINFO_STATE_MASK) == \ MDI_PATHINFO_STATE_FAULT) #define MDI_PI_IS_SUSPENDED(pip) \ ((MDI_PI(pip))->pi_phci->ph_flags & MDI_PHCI_FLAGS_SUSPEND) /* * mdi_vhcache_client, mdi_vhcache_pathinfo, and mdi_vhcache_phci structures * hold the vhci to phci client mappings of the on-disk vhci busconfig cache. */ /* phci structure of vhci cache */ typedef struct mdi_vhcache_phci { char *cphci_path; /* phci path name */ uint32_t cphci_id; /* used when building nvlist */ mdi_phci_t *cphci_phci; /* pointer to actual phci */ struct mdi_vhcache_phci *cphci_next; /* next in vhci phci list */ } mdi_vhcache_phci_t; /* pathinfo structure of vhci cache */ typedef struct mdi_vhcache_pathinfo { char *cpi_addr; /* path address */ mdi_vhcache_phci_t *cpi_cphci; /* phci the path belongs to */ struct mdi_pathinfo *cpi_pip; /* ptr to actual pathinfo */ uint32_t cpi_flags; /* see below */ struct mdi_vhcache_pathinfo *cpi_next; /* next path for the client */ } mdi_vhcache_pathinfo_t; /* * cpi_flags * * MDI_CPI_HINT_PATH_DOES_NOT_EXIST - set when configuration of the path has * failed. */ #define MDI_CPI_HINT_PATH_DOES_NOT_EXIST 0x0001 /* client structure of vhci cache */ typedef struct mdi_vhcache_client { char *cct_name_addr; /* client address */ mdi_vhcache_pathinfo_t *cct_cpi_head; /* client's path list head */ mdi_vhcache_pathinfo_t *cct_cpi_tail; /* client's path list tail */ struct mdi_vhcache_client *cct_next; /* next in vhci client list */ } mdi_vhcache_client_t; /* vhci cache structure - one for vhci instance */ typedef struct mdi_vhci_cache { mdi_vhcache_phci_t *vhcache_phci_head; /* phci list head */ mdi_vhcache_phci_t *vhcache_phci_tail; /* phci list tail */ mdi_vhcache_client_t *vhcache_client_head; /* client list head */ mdi_vhcache_client_t *vhcache_client_tail; /* client list tail */ mod_hash_t *vhcache_client_hash; /* client hash */ int vhcache_flags; /* see below */ int64_t vhcache_clean_time; /* last clean time */ krwlock_t vhcache_lock; /* cache lock */ } mdi_vhci_cache_t; /* vhcache_flags */ #define MDI_VHCI_CACHE_SETUP_DONE 0x0001 /* cache setup completed */ typedef struct mdi_phci_driver_info { char *phdriver_name; /* name of the phci driver */ /* set to non zero if the phci driver supports root device */ int phdriver_root_support; } mdi_phci_driver_info_t; /* vhci bus config structure - one for vhci instance */ typedef struct mdi_vhci_config { char *vhc_vhcache_filename; /* on-disk file name */ mdi_vhci_cache_t vhc_vhcache; /* vhci cache */ mdi_phci_driver_info_t *vhc_phci_driver_list; /* ph drv info array */ int vhc_nphci_drivers; /* # of phci drivers */ kmutex_t vhc_lock; /* vhci config lock */ kcondvar_t vhc_cv; int vhc_flags; /* see below */ /* flush vhci cache when lbolt reaches vhc_flush_at_ticks */ clock_t vhc_flush_at_ticks; /* * Head and tail of the client list whose paths are being configured * asynchronously. vhc_acc_count is the number of clients on this list. * vhc_acc_thrcount is the number threads running to configure * the paths for these clients. */ struct mdi_async_client_config *vhc_acc_list_head; struct mdi_async_client_config *vhc_acc_list_tail; int vhc_acc_count; int vhc_acc_thrcount; /* callback id - for flushing the cache during system shutdown */ callb_id_t vhc_cbid; } mdi_vhci_config_t; /* vhc_flags */ #define MDI_VHC_SINGLE_THREADED 0x0001 /* config single threaded */ #define MDI_VHC_EXIT 0x0002 /* exit all config activity */ #define MDI_VHC_VHCACHE_DIRTY 0x0004 /* cache dirty */ #define MDI_VHC_VHCACHE_FLUSH_THREAD 0x0008 /* cache flush thead running */ #define MDI_VHC_VHCACHE_FLUSH_ERROR 0x0010 /* failed to flush cache */ #define MDI_VHC_READONLY_FS 0x0020 /* filesys is readonly */ #define MDI_VHC_BUILD_VHCI_CACHE_THREAD 0x0040 /* cachebuild thread running */ typedef struct mdi_phys_path { char *phys_path; struct mdi_phys_path *phys_path_next; } mdi_phys_path_t; /* * Lookup tokens are used to cache the result of the vhci cache client lookup * operations (to reduce the number of real lookup operations). */ typedef struct mdi_vhcache_lookup_token { mdi_vhcache_client_t *lt_cct; /* vhcache client */ int64_t lt_cct_lookup_time; /* last lookup time */ } mdi_vhcache_lookup_token_t; /* asynchronous configuration of client paths */ typedef struct mdi_async_client_config { char *acc_ct_name; /* client name */ char *acc_ct_addr; /* client address */ mdi_phys_path_t *acc_phclient_path_list_head; /* path head */ mdi_vhcache_lookup_token_t acc_token; /* lookup token */ struct mdi_async_client_config *acc_next; /* next in vhci acc list */ } mdi_async_client_config_t; /* * vHCI driver instance registration/unregistration * * mdi_vhci_register() is called by a vHCI driver to register itself as the * manager of devices from a particular 'class'. This should be called from * attach(9e). * * mdi_vhci_unregister() is called from detach(9E) to unregister a vHCI * instance from the framework. */ int mdi_vhci_register(char *, dev_info_t *, mdi_vhci_ops_t *, int); int mdi_vhci_unregister(dev_info_t *, int); /* * Utility functions */ int mdi_phci_get_path_count(dev_info_t *); dev_info_t *mdi_phci_path2devinfo(dev_info_t *, caddr_t); /* * Path Selection Functions: * * mdi_select_path() is called by a vHCI driver to select to which path an * I/O request should be routed. The caller passes the 'buf' structure as * one of the parameters. The mpxio framework uses the buf's contents to * maintain per path statistics (total I/O size / count pending). If more * than one online path is available, the framework automatically selects * a suitable one. If a failover operation is active for this client device * the call fails, returning MDI_BUSY. * * By default this function returns a suitable path in the 'online' state, * based on the current load balancing policy. Currently we support * LOAD_BALANCE_NONE (Previously selected online path will continue to be * used as long as the path is usable) and LOAD_BALANCE_RR (Online paths * will be selected in a round robin fashion). The load balancing scheme * can be configured in the vHCI driver's configuration file (driver.conf). * * vHCI drivers may override this default behaviour by specifying appropriate * flags. If start_pip is specified (non NULL), it is used as the routine's * starting point; it starts walking from there to find the next appropriate * path. * * The following values for 'flags' are currently defined: * * MDI_SELECT_ONLINE_PATH: select an ONLINE path * MDI_SELECT_STANDBY_PATH: select a STANDBY path * * The selected paths are returned in a held state (ref_cnt) and caller should * release the hold by calling mdi_rele_path() at the end of operation. */ int mdi_select_path(dev_info_t *, struct buf *, int, mdi_pathinfo_t *, mdi_pathinfo_t **); void mdi_hold_path(mdi_pathinfo_t *); void mdi_rele_path(mdi_pathinfo_t *); int mdi_set_lb_policy(dev_info_t *, client_lb_t); int mdi_set_lb_region_size(dev_info_t *, int); client_lb_t mdi_get_lb_policy(dev_info_t *); /* * flags for mdi_select_path() routine */ #define MDI_SELECT_ONLINE_PATH 0x0001 #define MDI_SELECT_STANDBY_PATH 0x0002 /* * MDI client device utility functions */ int mdi_client_get_path_count(dev_info_t *); dev_info_t *mdi_client_path2devinfo(dev_info_t *, caddr_t); /* * Failover: * * The vHCI driver calls mdi_failover() to initiate a failover operation. * mdi_failover() calls back into the vHCI driver's vo_failover() * entry point to perform the actual failover operation. The reason * for requiring the vHCI driver to initiate failover by calling * mdi_failover(), instead of directly executing vo_failover() itself, * is to ensure that the mdi framework can keep track of the client * state properly. Additionally, mdi_failover() provides as a * convenience the option of performing the failover operation * synchronously or asynchronously * * Upon successful completion of the failover operation, the paths that were * previously ONLINE will be in the STANDBY state, and the newly activated * paths will be in the ONLINE state. * * The flags modifier determines whether the activation is done synchronously */ int mdi_failover(dev_info_t *, dev_info_t *, int); /* * Client device failover mode of operation */ #define MDI_FAILOVER_SYNC 1 /* Syncronous Failover */ #define MDI_FAILOVER_ASYNC 2 /* Asyncronous Failover */ /* * mdi_pathinfo node state change functions. */ void mdi_pi_kstat_iosupdate(mdi_pathinfo_t *, struct buf *); /* * mdi_pathinfo node extended state change functions. */ int mdi_pi_get_state2(mdi_pathinfo_t *, mdi_pathinfo_state_t *, uint32_t *); int mdi_pi_get_preferred(mdi_pathinfo_t *); /* * mdi_pathinfo node member functions */ void *mdi_pi_get_client_private(mdi_pathinfo_t *); void mdi_pi_set_client_private(mdi_pathinfo_t *, void *); void mdi_pi_set_state(mdi_pathinfo_t *, mdi_pathinfo_state_t); void mdi_pi_set_preferred(mdi_pathinfo_t *, int); /* get/set vhci private data */ void *mdi_client_get_vhci_private(dev_info_t *); void mdi_client_set_vhci_private(dev_info_t *, void *); void *mdi_phci_get_vhci_private(dev_info_t *); void mdi_phci_set_vhci_private(dev_info_t *, void *); void *mdi_pi_get_vhci_private(mdi_pathinfo_t *); void mdi_pi_set_vhci_private(mdi_pathinfo_t *, void *); /* * mdi_pathinfo Property utilities */ int mdi_prop_size(mdi_pathinfo_t *, size_t *); int mdi_prop_pack(mdi_pathinfo_t *, char **, uint_t); /* obsolete interface, to be removed */ void mdi_get_next_path(dev_info_t *, mdi_pathinfo_t *, mdi_pathinfo_t **); int mdi_get_component_type(dev_info_t *); #endif /* _KERNEL */ #ifdef __cplusplus } #endif #endif /* _SYS_MDI_IMPLDEFS_H */