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 /*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * Copyright (c) 2004-2009 Silicon Graphics, Inc.  All Rights Reserved.
  */
 
 /*
  * Cross Partition Communication (XPC) structures and macros.
  */
 
 #ifndef _DRIVERS_MISC_SGIXP_XPC_H
 #define _DRIVERS_MISC_SGIXP_XPC_H
 
 #include <linux/wait.h>
 #include <linux/completion.h>
 #include <linux/timer.h>
 #include <linux/sched.h>
 #include "xp.h"
 
 /*
  * XPC Version numbers consist of a major and minor number. XPC can always
  * talk to versions with same major #, and never talk to versions with a
  * different major #.
  */
 #define _XPC_VERSION(_maj, _min)    (((_maj) << 4) | ((_min) & 0xf))
 #define XPC_VERSION_MAJOR(_v)       ((_v) >> 4)
 #define XPC_VERSION_MINOR(_v)       ((_v) & 0xf)
 
 /* define frequency of the heartbeat and frequency how often it's checked */
 #define XPC_HB_DEFAULT_INTERVAL     5   /* incr HB every x secs */
 #define XPC_HB_CHECK_DEFAULT_INTERVAL   20  /* check HB every x secs */
 
 /* define the process name of HB checker and the CPU it is pinned to */
 #define XPC_HB_CHECK_THREAD_NAME    "xpc_hb"
 #define XPC_HB_CHECK_CPU        0
 
 /* define the process name of the discovery thread */
 #define XPC_DISCOVERY_THREAD_NAME   "xpc_discovery"
 
 /*
  * the reserved page
  *
  *   SAL reserves one page of memory per partition for XPC. Though a full page
  *   in length (16384 bytes), its starting address is not page aligned, but it
  *   is cacheline aligned. The reserved page consists of the following:
  *
  *   reserved page header
  *
  *     The first two 64-byte cachelines of the reserved page contain the
  *     header (struct xpc_rsvd_page). Before SAL initialization has completed,
  *     SAL has set up the following fields of the reserved page header:
  *     SAL_signature, SAL_version, SAL_partid, and SAL_nasids_size. The
  *     other fields are set up by XPC. (xpc_rsvd_page points to the local
  *     partition's reserved page.)
  *
  *   part_nasids mask
  *   mach_nasids mask
  *
  *     SAL also sets up two bitmaps (or masks), one that reflects the actual
  *     nasids in this partition (part_nasids), and the other that reflects
  *     the actual nasids in the entire machine (mach_nasids). We're only
  *     interested in the even numbered nasids (which contain the processors
  *     and/or memory), so we only need half as many bits to represent the
  *     nasids. When mapping nasid to bit in a mask (or bit to nasid) be sure
  *     to either divide or multiply by 2. The part_nasids mask is located
  *     starting at the first cacheline following the reserved page header. The
  *     mach_nasids mask follows right after the part_nasids mask. The size in
  *     bytes of each mask is reflected by the reserved page header field
  *     'SAL_nasids_size'. (Local partition's mask pointers are xpc_part_nasids
  *     and xpc_mach_nasids.)
  *
  *     Immediately following the mach_nasids mask are the XPC variables
  *     required by other partitions. First are those that are generic to all
  *     partitions (vars), followed on the next available cacheline by those
  *     which are partition specific (vars part). These are setup by XPC.
  *
  * Note: Until 'ts_jiffies' is set non-zero, the partition XPC code has not been
  *       initialized.
  */
 struct xpc_rsvd_page {
     u64 SAL_signature;  /* SAL: unique signature */
     u64 SAL_version;    /* SAL: version */
     short SAL_partid;   /* SAL: partition ID */
     short max_npartitions;  /* value of XPC_MAX_PARTITIONS */
     u8 version;
     u8 pad1[3];     /* align to next u64 in 1st 64-byte cacheline */
     unsigned long ts_jiffies; /* timestamp when rsvd pg was setup by XPC */
     union {
         struct {
             unsigned long heartbeat_gpa; /* phys addr */
             unsigned long activate_gru_mq_desc_gpa; /* phys addr */
         } uv;
     } sn;
     u64 pad2[9];        /* align to last u64 in 2nd 64-byte cacheline */
     u64 SAL_nasids_size;    /* SAL: size of each nasid mask in bytes */
 };
 
 #define XPC_RP_VERSION _XPC_VERSION(3, 0) /* version 3.0 of the reserved page */
 
 /* the reserved page sizes and offsets */
 
 #define XPC_RP_HEADER_SIZE  L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page))
 
 #define XPC_RP_PART_NASIDS(_rp) ((unsigned long *)((u8 *)(_rp) + \
                  XPC_RP_HEADER_SIZE))
 #define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + \
                  xpc_nasid_mask_nlongs)
 
 
 /*
  * The following structure describes the partition's heartbeat info which
  * will be periodically read by other partitions to determine whether this
  * XPC is still 'alive'.
  */
 struct xpc_heartbeat_uv {
     unsigned long value;
     unsigned long offline;  /* if 0, heartbeat should be changing */
 };
 
 /*
  * Info pertinent to a GRU message queue using a watch list for irq generation.
  */
 struct xpc_gru_mq_uv {
     void *address;      /* address of GRU message queue */
     unsigned int order; /* size of GRU message queue as a power of 2 */
     int irq;        /* irq raised when message is received in mq */
     int mmr_blade;      /* blade where watchlist was allocated from */
     unsigned long mmr_offset; /* offset of irq mmr located on mmr_blade */
     unsigned long mmr_value; /* value of irq mmr located on mmr_blade */
     int watchlist_num;  /* number of watchlist allocatd by BIOS */
     void *gru_mq_desc;  /* opaque structure used by the GRU driver */
 };
 
 /*
  * The activate_mq is used to send/receive GRU messages that affect XPC's
  * partition active state and channel state. This is uv only.
  */
 struct xpc_activate_mq_msghdr_uv {
     unsigned int gru_msg_hdr; /* FOR GRU INTERNAL USE ONLY */
     short partid;       /* sender's partid */
     u8 act_state;       /* sender's act_state at time msg sent */
     u8 type;        /* message's type */
     unsigned long rp_ts_jiffies; /* timestamp of sender's rp setup by XPC */
 };
 
 /* activate_mq defined message types */
 #define XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV       0
 
 #define XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV     1
 #define XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV       2
 
 #define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV   3
 #define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV     4
 #define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV    5
 #define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV      6
 #define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV   7
 
 #define XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV     8
 #define XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV      9
 
 struct xpc_activate_mq_msg_uv {
     struct xpc_activate_mq_msghdr_uv hdr;
 };
 
 struct xpc_activate_mq_msg_activate_req_uv {
     struct xpc_activate_mq_msghdr_uv hdr;
     unsigned long rp_gpa;
     unsigned long heartbeat_gpa;
     unsigned long activate_gru_mq_desc_gpa;
 };
 
 struct xpc_activate_mq_msg_deactivate_req_uv {
     struct xpc_activate_mq_msghdr_uv hdr;
     enum xp_retval reason;
 };
 
 struct xpc_activate_mq_msg_chctl_closerequest_uv {
     struct xpc_activate_mq_msghdr_uv hdr;
     short ch_number;
     enum xp_retval reason;
 };
 
 struct xpc_activate_mq_msg_chctl_closereply_uv {
     struct xpc_activate_mq_msghdr_uv hdr;
     short ch_number;
 };
 
 struct xpc_activate_mq_msg_chctl_openrequest_uv {
     struct xpc_activate_mq_msghdr_uv hdr;
     short ch_number;
     short entry_size;   /* size of notify_mq's GRU messages */
     short local_nentries;   /* ??? Is this needed? What is? */
 };
 
 struct xpc_activate_mq_msg_chctl_openreply_uv {
     struct xpc_activate_mq_msghdr_uv hdr;
     short ch_number;
     short remote_nentries;  /* ??? Is this needed? What is? */
     short local_nentries;   /* ??? Is this needed? What is? */
     unsigned long notify_gru_mq_desc_gpa;
 };
 
 struct xpc_activate_mq_msg_chctl_opencomplete_uv {
     struct xpc_activate_mq_msghdr_uv hdr;
     short ch_number;
 };
 
 /*
  * Functions registered by add_timer() or called by kernel_thread() only
  * allow for a single 64-bit argument. The following macros can be used to
  * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from
  * the passed argument.
  */
 #define XPC_PACK_ARGS(_arg1, _arg2) \
             ((((u64)_arg1) & 0xffffffff) | \
             ((((u64)_arg2) & 0xffffffff) << 32))
 
 #define XPC_UNPACK_ARG1(_args)  (((u64)_args) & 0xffffffff)
 #define XPC_UNPACK_ARG2(_args)  ((((u64)_args) >> 32) & 0xffffffff)
 
 /*
  * Define a structure that contains arguments associated with opening and
  * closing a channel.
  */
 struct xpc_openclose_args {
     u16 reason;     /* reason why channel is closing */
     u16 entry_size;     /* sizeof each message entry */
     u16 remote_nentries;    /* #of message entries in remote msg queue */
     u16 local_nentries; /* #of message entries in local msg queue */
     unsigned long local_msgqueue_pa; /* phys addr of local message queue */
 };
 
 #define XPC_OPENCLOSE_ARGS_SIZE \
           L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \
           XPC_MAX_NCHANNELS)
 
 
 /*
  * Structures to define a fifo singly-linked list.
  */
 
 struct xpc_fifo_entry_uv {
     struct xpc_fifo_entry_uv *next;
 };
 
 struct xpc_fifo_head_uv {
     struct xpc_fifo_entry_uv *first;
     struct xpc_fifo_entry_uv *last;
     spinlock_t lock;
     int n_entries;
 };
 
 /*
  * The format of a uv XPC notify_mq GRU message is as follows:
  *
  * A user-defined message resides in the payload area. The max size of the
  * payload is defined by the user via xpc_connect().
  *
  * The size of a message (payload and header) sent via the GRU must be either 1
  * or 2 GRU_CACHE_LINE_BYTES in length.
  */
 
 struct xpc_notify_mq_msghdr_uv {
     union {
         unsigned int gru_msg_hdr;   /* FOR GRU INTERNAL USE ONLY */
         struct xpc_fifo_entry_uv next;  /* FOR XPC INTERNAL USE ONLY */
     } u;
     short partid;       /* FOR XPC INTERNAL USE ONLY */
     u8 ch_number;       /* FOR XPC INTERNAL USE ONLY */
     u8 size;        /* FOR XPC INTERNAL USE ONLY */
     unsigned int msg_slot_number;   /* FOR XPC INTERNAL USE ONLY */
 };
 
 struct xpc_notify_mq_msg_uv {
     struct xpc_notify_mq_msghdr_uv hdr;
     unsigned long payload;
 };
 
 /* struct xpc_notify_sn2 type of notification */
 
 #define XPC_N_CALL  0x01    /* notify function provided by user */
 
 /*
  * Define uv's version of the notify entry. It additionally is used to allocate
  * a msg slot on the remote partition into which is copied a sent message.
  */
 struct xpc_send_msg_slot_uv {
     struct xpc_fifo_entry_uv next;
     unsigned int msg_slot_number;
     xpc_notify_func func;   /* user's notify function */
     void *key;      /* pointer to user's key */
 };
 
 /*
  * Define the structure that manages all the stuff required by a channel. In
  * particular, they are used to manage the messages sent across the channel.
  *
  * This structure is private to a partition, and is NOT shared across the
  * partition boundary.
  *
  * There is an array of these structures for each remote partition. It is
  * allocated at the time a partition becomes active. The array contains one
  * of these structures for each potential channel connection to that partition.
  */
 
 struct xpc_channel_uv {
     void *cached_notify_gru_mq_desc; /* remote partition's notify mq's */
                      /* gru mq descriptor */
 
     struct xpc_send_msg_slot_uv *send_msg_slots;
     void *recv_msg_slots;   /* each slot will hold a xpc_notify_mq_msg_uv */
                 /* structure plus the user's payload */
 
     struct xpc_fifo_head_uv msg_slot_free_list;
     struct xpc_fifo_head_uv recv_msg_list;  /* deliverable payloads */
 };
 
 struct xpc_channel {
     short partid;       /* ID of remote partition connected */
     spinlock_t lock;    /* lock for updating this structure */
     unsigned int flags; /* general flags */
 
     enum xp_retval reason;  /* reason why channel is disconnect'g */
     int reason_line;    /* line# disconnect initiated from */
 
     u16 number;     /* channel # */
 
     u16 entry_size;     /* sizeof each msg entry */
     u16 local_nentries; /* #of msg entries in local msg queue */
     u16 remote_nentries;    /* #of msg entries in remote msg queue */
 
     atomic_t references;    /* #of external references to queues */
 
     atomic_t n_on_msg_allocate_wq;  /* #on msg allocation wait queue */
     wait_queue_head_t msg_allocate_wq;  /* msg allocation wait queue */
 
     u8 delayed_chctl_flags; /* chctl flags received, but delayed */
                 /* action until channel disconnected */
 
     atomic_t n_to_notify;   /* #of msg senders to notify */
 
     xpc_channel_func func;  /* user's channel function */
     void *key;      /* pointer to user's key */
 
     struct completion wdisconnect_wait;    /* wait for channel disconnect */
 
     /* kthread management related fields */
 
     atomic_t kthreads_assigned; /* #of kthreads assigned to channel */
     u32 kthreads_assigned_limit;    /* limit on #of kthreads assigned */
     atomic_t kthreads_idle; /* #of kthreads idle waiting for work */
     u32 kthreads_idle_limit;    /* limit on #of kthreads idle */
     atomic_t kthreads_active;   /* #of kthreads actively working */
 
     wait_queue_head_t idle_wq;  /* idle kthread wait queue */
 
     union {
         struct xpc_channel_uv uv;
     } sn;
 
 } ____cacheline_aligned;
 
 /* struct xpc_channel flags */
 
 #define XPC_C_WASCONNECTED  0x00000001  /* channel was connected */
 
 #define XPC_C_ROPENCOMPLETE 0x00000002    /* remote open channel complete */
 #define XPC_C_OPENCOMPLETE  0x00000004     /* local open channel complete */
 #define XPC_C_ROPENREPLY    0x00000008  /* remote open channel reply */
 #define XPC_C_OPENREPLY     0x00000010  /* local open channel reply */
 #define XPC_C_ROPENREQUEST  0x00000020     /* remote open channel request */
 #define XPC_C_OPENREQUEST   0x00000040  /* local open channel request */
 
 #define XPC_C_SETUP     0x00000080 /* channel's msgqueues are alloc'd */
 #define XPC_C_CONNECTEDCALLOUT  0x00000100     /* connected callout initiated */
 #define XPC_C_CONNECTEDCALLOUT_MADE \
                 0x00000200     /* connected callout completed */
 #define XPC_C_CONNECTED     0x00000400  /* local channel is connected */
 #define XPC_C_CONNECTING    0x00000800  /* channel is being connected */
 
 #define XPC_C_RCLOSEREPLY   0x00001000  /* remote close channel reply */
 #define XPC_C_CLOSEREPLY    0x00002000  /* local close channel reply */
 #define XPC_C_RCLOSEREQUEST 0x00004000    /* remote close channel request */
 #define XPC_C_CLOSEREQUEST  0x00008000     /* local close channel request */
 
 #define XPC_C_DISCONNECTED  0x00010000  /* channel is disconnected */
 #define XPC_C_DISCONNECTING 0x00020000   /* channel is being disconnected */
 #define XPC_C_DISCONNECTINGCALLOUT \
                 0x00040000 /* disconnecting callout initiated */
 #define XPC_C_DISCONNECTINGCALLOUT_MADE \
                 0x00080000 /* disconnecting callout completed */
 #define XPC_C_WDISCONNECT   0x00100000  /* waiting for channel disconnect */
 
 /*
  * The channel control flags (chctl) union consists of a 64-bit variable which
  * is divided up into eight bytes, ordered from right to left. Byte zero
  * pertains to channel 0, byte one to channel 1, and so on. Each channel's byte
  * can have one or more of the chctl flags set in it.
  */
 
 union xpc_channel_ctl_flags {
     u64 all_flags;
     u8 flags[XPC_MAX_NCHANNELS];
 };
 
 /* chctl flags */
 #define XPC_CHCTL_CLOSEREQUEST  0x01
 #define XPC_CHCTL_CLOSEREPLY    0x02
 #define XPC_CHCTL_OPENREQUEST   0x04
 #define XPC_CHCTL_OPENREPLY 0x08
 #define XPC_CHCTL_OPENCOMPLETE  0x10
 #define XPC_CHCTL_MSGREQUEST    0x20
 
 #define XPC_OPENCLOSE_CHCTL_FLAGS \
             (XPC_CHCTL_CLOSEREQUEST | XPC_CHCTL_CLOSEREPLY | \
              XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY | \
              XPC_CHCTL_OPENCOMPLETE)
 #define XPC_MSG_CHCTL_FLAGS XPC_CHCTL_MSGREQUEST
 
 static inline int
 xpc_any_openclose_chctl_flags_set(union xpc_channel_ctl_flags *chctl)
 {
     int ch_number;
 
     for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) {
         if (chctl->flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS)
             return 1;
     }
     return 0;
 }
 
 static inline int
 xpc_any_msg_chctl_flags_set(union xpc_channel_ctl_flags *chctl)
 {
     int ch_number;
 
     for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) {
         if (chctl->flags[ch_number] & XPC_MSG_CHCTL_FLAGS)
             return 1;
     }
     return 0;
 }
 
 struct xpc_partition_uv {
     unsigned long heartbeat_gpa; /* phys addr of partition's heartbeat */
     struct xpc_heartbeat_uv cached_heartbeat; /* cached copy of */
                           /* partition's heartbeat */
     unsigned long activate_gru_mq_desc_gpa; /* phys addr of parititon's */
                         /* activate mq's gru mq */
                         /* descriptor */
     void *cached_activate_gru_mq_desc; /* cached copy of partition's */
                        /* activate mq's gru mq descriptor */
     struct mutex cached_activate_gru_mq_desc_mutex;
     spinlock_t flags_lock;  /* protect updating of flags */
     unsigned int flags; /* general flags */
     u8 remote_act_state;    /* remote partition's act_state */
     u8 act_state_req;   /* act_state request from remote partition */
     enum xp_retval reason;  /* reason for deactivate act_state request */
 };
 
 /* struct xpc_partition_uv flags */
 
 #define XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV    0x00000001
 #define XPC_P_ENGAGED_UV            0x00000002
 
 /* struct xpc_partition_uv act_state change requests */
 
 #define XPC_P_ASR_ACTIVATE_UV       0x01
 #define XPC_P_ASR_REACTIVATE_UV     0x02
 #define XPC_P_ASR_DEACTIVATE_UV     0x03
 
 struct xpc_partition {
 
     /* XPC HB infrastructure */
 
     u8 remote_rp_version;   /* version# of partition's rsvd pg */
     unsigned long remote_rp_ts_jiffies; /* timestamp when rsvd pg setup */
     unsigned long remote_rp_pa; /* phys addr of partition's rsvd pg */
     u64 last_heartbeat; /* HB at last read */
     u32 activate_IRQ_rcvd;  /* IRQs since activation */
     spinlock_t act_lock;    /* protect updating of act_state */
     u8 act_state;       /* from XPC HB viewpoint */
     enum xp_retval reason;  /* reason partition is deactivating */
     int reason_line;    /* line# deactivation initiated from */
 
     unsigned long disengage_timeout;    /* timeout in jiffies */
     struct timer_list disengage_timer;
 
     /* XPC infrastructure referencing and teardown control */
 
     u8 setup_state;     /* infrastructure setup state */
     wait_queue_head_t teardown_wq;  /* kthread waiting to teardown infra */
     atomic_t references;    /* #of references to infrastructure */
 
     u8 nchannels;       /* #of defined channels supported */
     atomic_t nchannels_active;  /* #of channels that are not DISCONNECTED */
     atomic_t nchannels_engaged;  /* #of channels engaged with remote part */
     struct xpc_channel *channels;   /* array of channel structures */
 
     /* fields used for managing channel avialability and activity */
 
     union xpc_channel_ctl_flags chctl; /* chctl flags yet to be processed */
     spinlock_t chctl_lock;  /* chctl flags lock */
 
     void *remote_openclose_args_base;  /* base address of kmalloc'd space */
     struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
                               /* args */
 
     /* channel manager related fields */
 
     atomic_t channel_mgr_requests;  /* #of requests to activate chan mgr */
     wait_queue_head_t channel_mgr_wq;   /* channel mgr's wait queue */
 
     union {
         struct xpc_partition_uv uv;
     } sn;
 
 } ____cacheline_aligned;
 
 struct xpc_arch_operations {
     int (*setup_partitions) (void);
     void (*teardown_partitions) (void);
     void (*process_activate_IRQ_rcvd) (void);
     enum xp_retval (*get_partition_rsvd_page_pa)
         (void *, u64 *, unsigned long *, size_t *);
     int (*setup_rsvd_page) (struct xpc_rsvd_page *);
 
     void (*allow_hb) (short);
     void (*disallow_hb) (short);
     void (*disallow_all_hbs) (void);
     void (*increment_heartbeat) (void);
     void (*offline_heartbeat) (void);
     void (*online_heartbeat) (void);
     void (*heartbeat_init) (void);
     void (*heartbeat_exit) (void);
     enum xp_retval (*get_remote_heartbeat) (struct xpc_partition *);
 
     void (*request_partition_activation) (struct xpc_rsvd_page *,
                          unsigned long, int);
     void (*request_partition_reactivation) (struct xpc_partition *);
     void (*request_partition_deactivation) (struct xpc_partition *);
     void (*cancel_partition_deactivation_request) (struct xpc_partition *);
     enum xp_retval (*setup_ch_structures) (struct xpc_partition *);
     void (*teardown_ch_structures) (struct xpc_partition *);
 
     enum xp_retval (*make_first_contact) (struct xpc_partition *);
 
     u64 (*get_chctl_all_flags) (struct xpc_partition *);
     void (*send_chctl_closerequest) (struct xpc_channel *, unsigned long *);
     void (*send_chctl_closereply) (struct xpc_channel *, unsigned long *);
     void (*send_chctl_openrequest) (struct xpc_channel *, unsigned long *);
     void (*send_chctl_openreply) (struct xpc_channel *, unsigned long *);
     void (*send_chctl_opencomplete) (struct xpc_channel *, unsigned long *);
     void (*process_msg_chctl_flags) (struct xpc_partition *, int);
 
     enum xp_retval (*save_remote_msgqueue_pa) (struct xpc_channel *,
                               unsigned long);
 
     enum xp_retval (*setup_msg_structures) (struct xpc_channel *);
     void (*teardown_msg_structures) (struct xpc_channel *);
 
     void (*indicate_partition_engaged) (struct xpc_partition *);
     void (*indicate_partition_disengaged) (struct xpc_partition *);
     void (*assume_partition_disengaged) (short);
     int (*partition_engaged) (short);
     int (*any_partition_engaged) (void);
 
     int (*n_of_deliverable_payloads) (struct xpc_channel *);
     enum xp_retval (*send_payload) (struct xpc_channel *, u32, void *,
                        u16, u8, xpc_notify_func, void *);
     void *(*get_deliverable_payload) (struct xpc_channel *);
     void (*received_payload) (struct xpc_channel *, void *);
     void (*notify_senders_of_disconnect) (struct xpc_channel *);
 };
 
 /* struct xpc_partition act_state values (for XPC HB) */
 
 #define XPC_P_AS_INACTIVE   0x00    /* partition is not active */
 #define XPC_P_AS_ACTIVATION_REQ 0x01    /* created thread to activate */
 #define XPC_P_AS_ACTIVATING 0x02    /* activation thread started */
 #define XPC_P_AS_ACTIVE     0x03    /* xpc_partition_up() was called */
 #define XPC_P_AS_DEACTIVATING   0x04    /* partition deactivation initiated */
 
 #define XPC_DEACTIVATE_PARTITION(_p, _reason) \
             xpc_deactivate_partition(__LINE__, (_p), (_reason))
 
 /* struct xpc_partition setup_state values */
 
 #define XPC_P_SS_UNSET      0x00    /* infrastructure was never setup */
 #define XPC_P_SS_SETUP      0x01    /* infrastructure is setup */
 #define XPC_P_SS_WTEARDOWN  0x02    /* waiting to teardown infrastructure */
 #define XPC_P_SS_TORNDOWN   0x03    /* infrastructure is torndown */
 
 /* number of seconds to wait for other partitions to disengage */
 #define XPC_DISENGAGE_DEFAULT_TIMELIMIT     90
 
 /* interval in seconds to print 'waiting deactivation' messages */
 #define XPC_DEACTIVATE_PRINTMSG_INTERVAL    10
 
 #define XPC_PARTID(_p)  ((short)((_p) - &xpc_partitions[0]))
 
 /* found in xp_main.c */
 extern struct xpc_registration xpc_registrations[];
 
 /* found in xpc_main.c */
 extern struct device *xpc_part;
 extern struct device *xpc_chan;
 extern struct xpc_arch_operations xpc_arch_ops;
 extern int xpc_disengage_timelimit;
 extern int xpc_disengage_timedout;
 extern int xpc_activate_IRQ_rcvd;
 extern spinlock_t xpc_activate_IRQ_rcvd_lock;
 extern wait_queue_head_t xpc_activate_IRQ_wq;
 extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **);
 extern void xpc_activate_partition(struct xpc_partition *);
 extern void xpc_activate_kthreads(struct xpc_channel *, int);
 extern void xpc_create_kthreads(struct xpc_channel *, int, int);
 extern void xpc_disconnect_wait(int);
 
 /* found in xpc_uv.c */
 extern int xpc_init_uv(void);
 extern void xpc_exit_uv(void);
 
 /* found in xpc_partition.c */
 extern int xpc_exiting;
 extern int xpc_nasid_mask_nlongs;
 extern struct xpc_rsvd_page *xpc_rsvd_page;
 extern unsigned long *xpc_mach_nasids;
 extern struct xpc_partition *xpc_partitions;
 extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
 extern int xpc_setup_rsvd_page(void);
 extern void xpc_teardown_rsvd_page(void);
 extern int xpc_identify_activate_IRQ_sender(void);
 extern int xpc_partition_disengaged(struct xpc_partition *);
 extern int xpc_partition_disengaged_from_timer(struct xpc_partition *part);
 extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *);
 extern void xpc_mark_partition_inactive(struct xpc_partition *);
 extern void xpc_discovery(void);
 extern enum xp_retval xpc_get_remote_rp(int, unsigned long *,
                     struct xpc_rsvd_page *,
                     unsigned long *);
 extern void xpc_deactivate_partition(const int, struct xpc_partition *,
                      enum xp_retval);
 extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *);
 
 /* found in xpc_channel.c */
 extern void xpc_initiate_connect(int);
 extern void xpc_initiate_disconnect(int);
 extern enum xp_retval xpc_allocate_msg_wait(struct xpc_channel *);
 extern enum xp_retval xpc_initiate_send(short, int, u32, void *, u16);
 extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16,
                            xpc_notify_func, void *);
 extern void xpc_initiate_received(short, int, void *);
 extern void xpc_process_sent_chctl_flags(struct xpc_partition *);
 extern void xpc_connected_callout(struct xpc_channel *);
 extern void xpc_deliver_payload(struct xpc_channel *);
 extern void xpc_disconnect_channel(const int, struct xpc_channel *,
                    enum xp_retval, unsigned long *);
 extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval);
 extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval);
 
 static inline void
 xpc_wakeup_channel_mgr(struct xpc_partition *part)
 {
     if (atomic_inc_return(&part->channel_mgr_requests) == 1)
         wake_up(&part->channel_mgr_wq);
 }
 
 /*
  * These next two inlines are used to keep us from tearing down a channel's
  * msg queues while a thread may be referencing them.
  */
 static inline void
 xpc_msgqueue_ref(struct xpc_channel *ch)
 {
     atomic_inc(&ch->references);
 }
 
 static inline void
 xpc_msgqueue_deref(struct xpc_channel *ch)
 {
     s32 refs = atomic_dec_return(&ch->references);
 
     DBUG_ON(refs < 0);
     if (refs == 0)
         xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]);
 }
 
 #define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \
         xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs)
 
 /*
  * These two inlines are used to keep us from tearing down a partition's
  * setup infrastructure while a thread may be referencing it.
  */
 static inline void
 xpc_part_deref(struct xpc_partition *part)
 {
     s32 refs = atomic_dec_return(&part->references);
 
     DBUG_ON(refs < 0);
     if (refs == 0 && part->setup_state == XPC_P_SS_WTEARDOWN)
         wake_up(&part->teardown_wq);
 }
 
 static inline int
 xpc_part_ref(struct xpc_partition *part)
 {
     int setup;
 
     atomic_inc(&part->references);
     setup = (part->setup_state == XPC_P_SS_SETUP);
     if (!setup)
         xpc_part_deref(part);
 
     return setup;
 }
 
 /*
  * The following macro is to be used for the setting of the reason and
  * reason_line fields in both the struct xpc_channel and struct xpc_partition
  * structures.
  */
 #define XPC_SET_REASON(_p, _reason, _line) \
     { \
         (_p)->reason = _reason; \
         (_p)->reason_line = _line; \
     }
 
 #endif /* _DRIVERS_MISC_SGIXP_XPC_H */

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