89eb8eb927
This patch contains the communication module (XPC) for cross partition communication on a partitioned SGI Altix. Signed-off-by: Dean Nelson <dcn@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
992 lines
32 KiB
C
992 lines
32 KiB
C
/*
|
|
* 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) 2004-2005 Silicon Graphics, Inc. All Rights Reserved.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Cross Partition Communication (XPC) structures and macros.
|
|
*/
|
|
|
|
#ifndef _IA64_SN_KERNEL_XPC_H
|
|
#define _IA64_SN_KERNEL_XPC_H
|
|
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/device.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/sn/bte.h>
|
|
#include <asm/sn/clksupport.h>
|
|
#include <asm/sn/addrs.h>
|
|
#include <asm/sn/mspec.h>
|
|
#include <asm/sn/shub_mmr.h>
|
|
#include <asm/sn/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)
|
|
|
|
|
|
/*
|
|
* The next macros define word or bit representations for given
|
|
* C-brick nasid in either the SAL provided bit array representing
|
|
* nasids in the partition/machine or the AMO_t array used for
|
|
* inter-partition initiation communications.
|
|
*
|
|
* For SN2 machines, C-Bricks are alway even numbered NASIDs. As
|
|
* such, some space will be saved by insisting that nasid information
|
|
* passed from SAL always be packed for C-Bricks and the
|
|
* cross-partition interrupts use the same packing scheme.
|
|
*/
|
|
#define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2)
|
|
#define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1))
|
|
#define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \
|
|
(1UL << XPC_NASID_B_INDEX(_n)))
|
|
#define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2)
|
|
|
|
#define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */
|
|
#define XPC_HB_CHECK_DEFAULT_TIMEOUT 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"
|
|
|
|
|
|
#define XPC_HB_ALLOWED(_p, _v) ((_v)->heartbeating_to_mask & (1UL << (_p)))
|
|
#define XPC_ALLOW_HB(_p, _v) (_v)->heartbeating_to_mask |= (1UL << (_p))
|
|
#define XPC_DISALLOW_HB(_p, _v) (_v)->heartbeating_to_mask &= (~(1UL << (_p)))
|
|
|
|
|
|
/*
|
|
* Reserved Page provided by SAL.
|
|
*
|
|
* SAL provides one page per partition of reserved memory. When SAL
|
|
* initialization is complete, SAL_signature, SAL_version, partid,
|
|
* part_nasids, and mach_nasids are set.
|
|
*
|
|
* Note: Until vars_pa is set, the partition XPC code has not been initialized.
|
|
*/
|
|
struct xpc_rsvd_page {
|
|
u64 SAL_signature; /* SAL unique signature */
|
|
u64 SAL_version; /* SAL specified version */
|
|
u8 partid; /* partition ID from SAL */
|
|
u8 version;
|
|
u8 pad[6]; /* pad to u64 align */
|
|
u64 vars_pa;
|
|
u64 part_nasids[XP_NASID_MASK_WORDS] ____cacheline_aligned;
|
|
u64 mach_nasids[XP_NASID_MASK_WORDS] ____cacheline_aligned;
|
|
};
|
|
#define XPC_RP_VERSION _XPC_VERSION(1,0) /* version 1.0 of the reserved page */
|
|
|
|
#define XPC_RSVD_PAGE_ALIGNED_SIZE \
|
|
(L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)))
|
|
|
|
|
|
/*
|
|
* Define the structures by which XPC variables can be exported to other
|
|
* partitions. (There are two: struct xpc_vars and struct xpc_vars_part)
|
|
*/
|
|
|
|
/*
|
|
* The following structure describes the partition generic variables
|
|
* needed by other partitions in order to properly initialize.
|
|
*
|
|
* struct xpc_vars version number also applies to struct xpc_vars_part.
|
|
* Changes to either structure and/or related functionality should be
|
|
* reflected by incrementing either the major or minor version numbers
|
|
* of struct xpc_vars.
|
|
*/
|
|
struct xpc_vars {
|
|
u8 version;
|
|
u64 heartbeat;
|
|
u64 heartbeating_to_mask;
|
|
u64 kdb_status; /* 0 = machine running */
|
|
int act_nasid;
|
|
int act_phys_cpuid;
|
|
u64 vars_part_pa;
|
|
u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */
|
|
AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */
|
|
AMO_t *act_amos; /* pointer to the first activation AMO */
|
|
};
|
|
#define XPC_V_VERSION _XPC_VERSION(3,0) /* version 3.0 of the cross vars */
|
|
|
|
#define XPC_VARS_ALIGNED_SIZE (L1_CACHE_ALIGN(sizeof(struct xpc_vars)))
|
|
|
|
/*
|
|
* The following structure describes the per partition specific variables.
|
|
*
|
|
* An array of these structures, one per partition, will be defined. As a
|
|
* partition becomes active XPC will copy the array entry corresponding to
|
|
* itself from that partition. It is desirable that the size of this
|
|
* structure evenly divide into a cacheline, such that none of the entries
|
|
* in this array crosses a cacheline boundary. As it is now, each entry
|
|
* occupies half a cacheline.
|
|
*/
|
|
struct xpc_vars_part {
|
|
u64 magic;
|
|
|
|
u64 openclose_args_pa; /* physical address of open and close args */
|
|
u64 GPs_pa; /* physical address of Get/Put values */
|
|
|
|
u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */
|
|
int IPI_nasid; /* nasid of where to send IPIs */
|
|
int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */
|
|
|
|
u8 nchannels; /* #of defined channels supported */
|
|
|
|
u8 reserved[23]; /* pad to a full 64 bytes */
|
|
};
|
|
|
|
/*
|
|
* The vars_part MAGIC numbers play a part in the first contact protocol.
|
|
*
|
|
* MAGIC1 indicates that the per partition specific variables for a remote
|
|
* partition have been initialized by this partition.
|
|
*
|
|
* MAGIC2 indicates that this partition has pulled the remote partititions
|
|
* per partition variables that pertain to this partition.
|
|
*/
|
|
#define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */
|
|
#define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */
|
|
|
|
|
|
|
|
/*
|
|
* 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 Get/Put value pair (pointers) used with a message queue.
|
|
*/
|
|
struct xpc_gp {
|
|
s64 get; /* Get value */
|
|
s64 put; /* Put value */
|
|
};
|
|
|
|
#define XPC_GP_SIZE \
|
|
L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_NCHANNELS)
|
|
|
|
|
|
|
|
/*
|
|
* 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 msg_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 */
|
|
u64 local_msgqueue_pa; /* physical address of local message queue */
|
|
};
|
|
|
|
#define XPC_OPENCLOSE_ARGS_SIZE \
|
|
L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * XPC_NCHANNELS)
|
|
|
|
|
|
|
|
/* struct xpc_msg flags */
|
|
|
|
#define XPC_M_DONE 0x01 /* msg has been received/consumed */
|
|
#define XPC_M_READY 0x02 /* msg is ready to be sent */
|
|
#define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */
|
|
|
|
|
|
#define XPC_MSG_ADDRESS(_payload) \
|
|
((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET))
|
|
|
|
|
|
|
|
/*
|
|
* Defines notify entry.
|
|
*
|
|
* This is used to notify a message's sender that their message was received
|
|
* and consumed by the intended recipient.
|
|
*/
|
|
struct xpc_notify {
|
|
struct semaphore sema; /* notify semaphore */
|
|
u8 type; /* type of notification */
|
|
|
|
/* the following two fields are only used if type == XPC_N_CALL */
|
|
xpc_notify_func func; /* user's notify function */
|
|
void *key; /* pointer to user's key */
|
|
};
|
|
|
|
/* struct xpc_notify type of notification */
|
|
|
|
#define XPC_N_CALL 0x01 /* notify function provided by user */
|
|
|
|
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* Each of these structures manages two message queues (circular buffers).
|
|
* They are allocated at the time a channel connection is made. One of
|
|
* these message queues (local_msgqueue) holds the locally created messages
|
|
* that are destined for the remote partition. The other of these message
|
|
* queues (remote_msgqueue) is a locally cached copy of the remote partition's
|
|
* own local_msgqueue.
|
|
*
|
|
* The following is a description of the Get/Put pointers used to manage these
|
|
* two message queues. Consider the local_msgqueue to be on one partition
|
|
* and the remote_msgqueue to be its cached copy on another partition. A
|
|
* description of what each of the lettered areas contains is included.
|
|
*
|
|
*
|
|
* local_msgqueue remote_msgqueue
|
|
*
|
|
* |/////////| |/////////|
|
|
* w_remote_GP.get --> +---------+ |/////////|
|
|
* | F | |/////////|
|
|
* remote_GP.get --> +---------+ +---------+ <-- local_GP->get
|
|
* | | | |
|
|
* | | | E |
|
|
* | | | |
|
|
* | | +---------+ <-- w_local_GP.get
|
|
* | B | |/////////|
|
|
* | | |////D////|
|
|
* | | |/////////|
|
|
* | | +---------+ <-- w_remote_GP.put
|
|
* | | |////C////|
|
|
* local_GP->put --> +---------+ +---------+ <-- remote_GP.put
|
|
* | | |/////////|
|
|
* | A | |/////////|
|
|
* | | |/////////|
|
|
* w_local_GP.put --> +---------+ |/////////|
|
|
* |/////////| |/////////|
|
|
*
|
|
*
|
|
* ( remote_GP.[get|put] are cached copies of the remote
|
|
* partition's local_GP->[get|put], and thus their values can
|
|
* lag behind their counterparts on the remote partition. )
|
|
*
|
|
*
|
|
* A - Messages that have been allocated, but have not yet been sent to the
|
|
* remote partition.
|
|
*
|
|
* B - Messages that have been sent, but have not yet been acknowledged by the
|
|
* remote partition as having been received.
|
|
*
|
|
* C - Area that needs to be prepared for the copying of sent messages, by
|
|
* the clearing of the message flags of any previously received messages.
|
|
*
|
|
* D - Area into which sent messages are to be copied from the remote
|
|
* partition's local_msgqueue and then delivered to their intended
|
|
* recipients. [ To allow for a multi-message copy, another pointer
|
|
* (next_msg_to_pull) has been added to keep track of the next message
|
|
* number needing to be copied (pulled). It chases after w_remote_GP.put.
|
|
* Any messages lying between w_local_GP.get and next_msg_to_pull have
|
|
* been copied and are ready to be delivered. ]
|
|
*
|
|
* E - Messages that have been copied and delivered, but have not yet been
|
|
* acknowledged by the recipient as having been received.
|
|
*
|
|
* F - Messages that have been acknowledged, but XPC has not yet notified the
|
|
* sender that the message was received by its intended recipient.
|
|
* This is also an area that needs to be prepared for the allocating of
|
|
* new messages, by the clearing of the message flags of the acknowledged
|
|
* messages.
|
|
*/
|
|
struct xpc_channel {
|
|
partid_t partid; /* ID of remote partition connected */
|
|
spinlock_t lock; /* lock for updating this structure */
|
|
u32 flags; /* general flags */
|
|
|
|
enum xpc_retval reason; /* reason why channel is disconnect'g */
|
|
int reason_line; /* line# disconnect initiated from */
|
|
|
|
u16 number; /* channel # */
|
|
|
|
u16 msg_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*/
|
|
|
|
void *local_msgqueue_base; /* base address of kmalloc'd space */
|
|
struct xpc_msg *local_msgqueue; /* local message queue */
|
|
void *remote_msgqueue_base; /* base address of kmalloc'd space */
|
|
struct xpc_msg *remote_msgqueue;/* cached copy of remote partition's */
|
|
/* local message queue */
|
|
u64 remote_msgqueue_pa; /* phys addr of remote partition's */
|
|
/* local message 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 */
|
|
|
|
/* queue of msg senders who want to be notified when msg received */
|
|
|
|
atomic_t n_to_notify; /* #of msg senders to notify */
|
|
struct xpc_notify *notify_queue;/* notify queue for messages sent */
|
|
|
|
xpc_channel_func func; /* user's channel function */
|
|
void *key; /* pointer to user's key */
|
|
|
|
struct semaphore msg_to_pull_sema; /* next msg to pull serialization */
|
|
struct semaphore teardown_sema; /* wait for teardown completion */
|
|
|
|
struct xpc_openclose_args *local_openclose_args; /* args passed on */
|
|
/* opening or closing of channel */
|
|
|
|
/* various flavors of local and remote Get/Put values */
|
|
|
|
struct xpc_gp *local_GP; /* local Get/Put values */
|
|
struct xpc_gp remote_GP; /* remote Get/Put values */
|
|
struct xpc_gp w_local_GP; /* working local Get/Put values */
|
|
struct xpc_gp w_remote_GP; /* working remote Get/Put values */
|
|
s64 next_msg_to_pull; /* Put value of next msg to pull */
|
|
|
|
/* kthread management related fields */
|
|
|
|
// >>> rethink having kthreads_assigned_limit and kthreads_idle_limit; perhaps
|
|
// >>> allow the assigned limit be unbounded and let the idle limit be dynamic
|
|
// >>> dependent on activity over the last interval of time
|
|
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 */
|
|
// >>> following field is temporary
|
|
u32 kthreads_created; /* total #of kthreads created */
|
|
|
|
wait_queue_head_t idle_wq; /* idle kthread wait queue */
|
|
|
|
} ____cacheline_aligned;
|
|
|
|
|
|
/* struct xpc_channel flags */
|
|
|
|
#define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */
|
|
|
|
#define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */
|
|
#define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */
|
|
#define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */
|
|
#define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */
|
|
|
|
#define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */
|
|
#define XPC_C_CONNECTCALLOUT 0x00000040 /* channel connected callout made */
|
|
#define XPC_C_CONNECTED 0x00000080 /* local channel is connected */
|
|
#define XPC_C_CONNECTING 0x00000100 /* channel is being connected */
|
|
|
|
#define XPC_C_RCLOSEREPLY 0x00000200 /* remote close channel reply */
|
|
#define XPC_C_CLOSEREPLY 0x00000400 /* local close channel reply */
|
|
#define XPC_C_RCLOSEREQUEST 0x00000800 /* remote close channel request */
|
|
#define XPC_C_CLOSEREQUEST 0x00001000 /* local close channel request */
|
|
|
|
#define XPC_C_DISCONNECTED 0x00002000 /* channel is disconnected */
|
|
#define XPC_C_DISCONNECTING 0x00004000 /* channel is being disconnected */
|
|
|
|
|
|
|
|
/*
|
|
* Manages channels on a partition basis. There is one of these structures
|
|
* for each partition (a partition will never utilize the structure that
|
|
* represents itself).
|
|
*/
|
|
struct xpc_partition {
|
|
|
|
/* XPC HB infrastructure */
|
|
|
|
u64 remote_rp_pa; /* phys addr of partition's rsvd pg */
|
|
u64 remote_vars_pa; /* phys addr of partition's vars */
|
|
u64 remote_vars_part_pa; /* phys addr of partition's vars part */
|
|
u64 last_heartbeat; /* HB at last read */
|
|
u64 remote_amos_page_pa; /* phys addr of partition's amos page */
|
|
int remote_act_nasid; /* active part's act/deact nasid */
|
|
int remote_act_phys_cpuid; /* active part's act/deact phys cpuid */
|
|
u32 act_IRQ_rcvd; /* IRQs since activation */
|
|
spinlock_t act_lock; /* protect updating of act_state */
|
|
u8 act_state; /* from XPC HB viewpoint */
|
|
enum xpc_retval reason; /* reason partition is deactivating */
|
|
int reason_line; /* line# deactivation initiated from */
|
|
int reactivate_nasid; /* nasid in partition to reactivate */
|
|
|
|
|
|
/* 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 */
|
|
|
|
|
|
/*
|
|
* NONE OF THE PRECEDING FIELDS OF THIS STRUCTURE WILL BE CLEARED WHEN
|
|
* XPC SETS UP THE NECESSARY INFRASTRUCTURE TO SUPPORT CROSS PARTITION
|
|
* COMMUNICATION. ALL OF THE FOLLOWING FIELDS WILL BE CLEARED. (THE
|
|
* 'nchannels' FIELD MUST BE THE FIRST OF THE FIELDS TO BE CLEARED.)
|
|
*/
|
|
|
|
|
|
u8 nchannels; /* #of defined channels supported */
|
|
atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */
|
|
struct xpc_channel *channels;/* array of channel structures */
|
|
|
|
void *local_GPs_base; /* base address of kmalloc'd space */
|
|
struct xpc_gp *local_GPs; /* local Get/Put values */
|
|
void *remote_GPs_base; /* base address of kmalloc'd space */
|
|
struct xpc_gp *remote_GPs;/* copy of remote partition's local Get/Put */
|
|
/* values */
|
|
u64 remote_GPs_pa; /* phys address of remote partition's local */
|
|
/* Get/Put values */
|
|
|
|
|
|
/* fields used to pass args when opening or closing a channel */
|
|
|
|
void *local_openclose_args_base; /* base address of kmalloc'd space */
|
|
struct xpc_openclose_args *local_openclose_args; /* local's args */
|
|
void *remote_openclose_args_base; /* base address of kmalloc'd space */
|
|
struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
|
|
/* args */
|
|
u64 remote_openclose_args_pa; /* phys addr of remote's args */
|
|
|
|
|
|
/* IPI sending, receiving and handling related fields */
|
|
|
|
int remote_IPI_nasid; /* nasid of where to send IPIs */
|
|
int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */
|
|
AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */
|
|
|
|
AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */
|
|
u64 local_IPI_amo; /* IPI amo flags yet to be handled */
|
|
char IPI_owner[8]; /* IPI owner's name */
|
|
struct timer_list dropped_IPI_timer; /* dropped IPI timer */
|
|
|
|
spinlock_t IPI_lock; /* IPI handler lock */
|
|
|
|
|
|
/* 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 */
|
|
|
|
} ____cacheline_aligned;
|
|
|
|
|
|
/* struct xpc_partition act_state values (for XPC HB) */
|
|
|
|
#define XPC_P_INACTIVE 0x00 /* partition is not active */
|
|
#define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */
|
|
#define XPC_P_ACTIVATING 0x02 /* activation thread started */
|
|
#define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */
|
|
#define XPC_P_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_UNSET 0x00 /* infrastructure was never setup */
|
|
#define XPC_P_SETUP 0x01 /* infrastructure is setup */
|
|
#define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */
|
|
#define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */
|
|
|
|
|
|
/*
|
|
* struct xpc_partition IPI_timer #of seconds to wait before checking for
|
|
* dropped IPIs. These occur whenever an IPI amo write doesn't complete until
|
|
* after the IPI was received.
|
|
*/
|
|
#define XPC_P_DROPPED_IPI_WAIT (0.25 * HZ)
|
|
|
|
|
|
#define XPC_PARTID(_p) ((partid_t) ((_p) - &xpc_partitions[0]))
|
|
|
|
|
|
|
|
/* found in xp_main.c */
|
|
extern struct xpc_registration xpc_registrations[];
|
|
|
|
|
|
/* >>> found in xpc_main.c only */
|
|
extern struct device *xpc_part;
|
|
extern struct device *xpc_chan;
|
|
extern irqreturn_t xpc_notify_IRQ_handler(int, void *, struct pt_regs *);
|
|
extern void xpc_dropped_IPI_check(struct xpc_partition *);
|
|
extern void xpc_activate_kthreads(struct xpc_channel *, int);
|
|
extern void xpc_create_kthreads(struct xpc_channel *, int);
|
|
extern void xpc_disconnect_wait(int);
|
|
|
|
|
|
/* found in xpc_main.c and efi-xpc.c */
|
|
extern void xpc_activate_partition(struct xpc_partition *);
|
|
|
|
|
|
/* found in xpc_partition.c */
|
|
extern int xpc_exiting;
|
|
extern int xpc_hb_interval;
|
|
extern int xpc_hb_check_interval;
|
|
extern struct xpc_vars *xpc_vars;
|
|
extern struct xpc_rsvd_page *xpc_rsvd_page;
|
|
extern struct xpc_vars_part *xpc_vars_part;
|
|
extern struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
|
|
extern char xpc_remote_copy_buffer[];
|
|
extern struct xpc_rsvd_page *xpc_rsvd_page_init(void);
|
|
extern void xpc_allow_IPI_ops(void);
|
|
extern void xpc_restrict_IPI_ops(void);
|
|
extern int xpc_identify_act_IRQ_sender(void);
|
|
extern enum xpc_retval xpc_mark_partition_active(struct xpc_partition *);
|
|
extern void xpc_mark_partition_inactive(struct xpc_partition *);
|
|
extern void xpc_discovery(void);
|
|
extern void xpc_check_remote_hb(void);
|
|
extern void xpc_deactivate_partition(const int, struct xpc_partition *,
|
|
enum xpc_retval);
|
|
extern enum xpc_retval xpc_initiate_partid_to_nasids(partid_t, void *);
|
|
|
|
|
|
/* found in xpc_channel.c */
|
|
extern void xpc_initiate_connect(int);
|
|
extern void xpc_initiate_disconnect(int);
|
|
extern enum xpc_retval xpc_initiate_allocate(partid_t, int, u32, void **);
|
|
extern enum xpc_retval xpc_initiate_send(partid_t, int, void *);
|
|
extern enum xpc_retval xpc_initiate_send_notify(partid_t, int, void *,
|
|
xpc_notify_func, void *);
|
|
extern void xpc_initiate_received(partid_t, int, void *);
|
|
extern enum xpc_retval xpc_setup_infrastructure(struct xpc_partition *);
|
|
extern enum xpc_retval xpc_pull_remote_vars_part(struct xpc_partition *);
|
|
extern void xpc_process_channel_activity(struct xpc_partition *);
|
|
extern void xpc_connected_callout(struct xpc_channel *);
|
|
extern void xpc_deliver_msg(struct xpc_channel *);
|
|
extern void xpc_disconnect_channel(const int, struct xpc_channel *,
|
|
enum xpc_retval, unsigned long *);
|
|
extern void xpc_disconnected_callout(struct xpc_channel *);
|
|
extern void xpc_partition_down(struct xpc_partition *, enum xpc_retval);
|
|
extern void xpc_teardown_infrastructure(struct xpc_partition *);
|
|
|
|
|
|
|
|
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_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_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; \
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* The following set of macros and inlines are used for the sending and
|
|
* receiving of IPIs (also known as IRQs). There are two flavors of IPIs,
|
|
* one that is associated with partition activity (SGI_XPC_ACTIVATE) and
|
|
* the other that is associated with channel activity (SGI_XPC_NOTIFY).
|
|
*/
|
|
|
|
static inline u64
|
|
xpc_IPI_receive(AMO_t *amo)
|
|
{
|
|
return FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_CLEAR);
|
|
}
|
|
|
|
|
|
static inline enum xpc_retval
|
|
xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
|
|
{
|
|
int ret = 0;
|
|
unsigned long irq_flags;
|
|
|
|
|
|
local_irq_save(irq_flags);
|
|
|
|
FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR, flag);
|
|
sn_send_IPI_phys(nasid, phys_cpuid, vector, 0);
|
|
|
|
/*
|
|
* We must always use the nofault function regardless of whether we
|
|
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
|
|
* didn't, we'd never know that the other partition is down and would
|
|
* keep sending IPIs and AMOs to it until the heartbeat times out.
|
|
*/
|
|
ret = xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->variable),
|
|
xp_nofault_PIOR_target));
|
|
|
|
local_irq_restore(irq_flags);
|
|
|
|
return ((ret == 0) ? xpcSuccess : xpcPioReadError);
|
|
}
|
|
|
|
|
|
/*
|
|
* IPIs associated with SGI_XPC_ACTIVATE IRQ.
|
|
*/
|
|
|
|
/*
|
|
* Flag the appropriate AMO variable and send an IPI to the specified node.
|
|
*/
|
|
static inline void
|
|
xpc_activate_IRQ_send(u64 amos_page, int from_nasid, int to_nasid,
|
|
int to_phys_cpuid)
|
|
{
|
|
int w_index = XPC_NASID_W_INDEX(from_nasid);
|
|
int b_index = XPC_NASID_B_INDEX(from_nasid);
|
|
AMO_t *amos = (AMO_t *) __va(amos_page +
|
|
(XP_MAX_PARTITIONS * sizeof(AMO_t)));
|
|
|
|
|
|
(void) xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid,
|
|
to_phys_cpuid, SGI_XPC_ACTIVATE);
|
|
}
|
|
|
|
static inline void
|
|
xpc_IPI_send_activate(struct xpc_vars *vars)
|
|
{
|
|
xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0),
|
|
vars->act_nasid, vars->act_phys_cpuid);
|
|
}
|
|
|
|
static inline void
|
|
xpc_IPI_send_activated(struct xpc_partition *part)
|
|
{
|
|
xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0),
|
|
part->remote_act_nasid, part->remote_act_phys_cpuid);
|
|
}
|
|
|
|
static inline void
|
|
xpc_IPI_send_reactivate(struct xpc_partition *part)
|
|
{
|
|
xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid,
|
|
xpc_vars->act_nasid, xpc_vars->act_phys_cpuid);
|
|
}
|
|
|
|
|
|
/*
|
|
* IPIs associated with SGI_XPC_NOTIFY IRQ.
|
|
*/
|
|
|
|
/*
|
|
* Send an IPI to the remote partition that is associated with the
|
|
* specified channel.
|
|
*/
|
|
#define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \
|
|
xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f)
|
|
|
|
static inline void
|
|
xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string,
|
|
unsigned long *irq_flags)
|
|
{
|
|
struct xpc_partition *part = &xpc_partitions[ch->partid];
|
|
enum xpc_retval ret;
|
|
|
|
|
|
if (likely(part->act_state != XPC_P_DEACTIVATING)) {
|
|
ret = xpc_IPI_send(part->remote_IPI_amo_va,
|
|
(u64) ipi_flag << (ch->number * 8),
|
|
part->remote_IPI_nasid,
|
|
part->remote_IPI_phys_cpuid,
|
|
SGI_XPC_NOTIFY);
|
|
dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n",
|
|
ipi_flag_string, ch->partid, ch->number, ret);
|
|
if (unlikely(ret != xpcSuccess)) {
|
|
if (irq_flags != NULL) {
|
|
spin_unlock_irqrestore(&ch->lock, *irq_flags);
|
|
}
|
|
XPC_DEACTIVATE_PARTITION(part, ret);
|
|
if (irq_flags != NULL) {
|
|
spin_lock_irqsave(&ch->lock, *irq_flags);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Make it look like the remote partition, which is associated with the
|
|
* specified channel, sent us an IPI. This faked IPI will be handled
|
|
* by xpc_dropped_IPI_check().
|
|
*/
|
|
#define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \
|
|
xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f)
|
|
|
|
static inline void
|
|
xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag,
|
|
char *ipi_flag_string)
|
|
{
|
|
struct xpc_partition *part = &xpc_partitions[ch->partid];
|
|
|
|
|
|
FETCHOP_STORE_OP(TO_AMO((u64) &part->local_IPI_amo_va->variable),
|
|
FETCHOP_OR, ((u64) ipi_flag << (ch->number * 8)));
|
|
dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n",
|
|
ipi_flag_string, ch->partid, ch->number);
|
|
}
|
|
|
|
|
|
/*
|
|
* The sending and receiving of IPIs includes the setting of an AMO variable
|
|
* to indicate the reason the IPI was sent. The 64-bit variable 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 byte is described by
|
|
* the following IPI flags.
|
|
*/
|
|
|
|
#define XPC_IPI_CLOSEREQUEST 0x01
|
|
#define XPC_IPI_CLOSEREPLY 0x02
|
|
#define XPC_IPI_OPENREQUEST 0x04
|
|
#define XPC_IPI_OPENREPLY 0x08
|
|
#define XPC_IPI_MSGREQUEST 0x10
|
|
|
|
|
|
/* given an AMO variable and a channel#, get its associated IPI flags */
|
|
#define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff))
|
|
|
|
#define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0f)
|
|
#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & 0x1010101010101010)
|
|
|
|
|
|
static inline void
|
|
xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags)
|
|
{
|
|
struct xpc_openclose_args *args = ch->local_openclose_args;
|
|
|
|
|
|
args->reason = ch->reason;
|
|
|
|
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags);
|
|
}
|
|
|
|
static inline void
|
|
xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags)
|
|
{
|
|
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags);
|
|
}
|
|
|
|
static inline void
|
|
xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags)
|
|
{
|
|
struct xpc_openclose_args *args = ch->local_openclose_args;
|
|
|
|
|
|
args->msg_size = ch->msg_size;
|
|
args->local_nentries = ch->local_nentries;
|
|
|
|
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags);
|
|
}
|
|
|
|
static inline void
|
|
xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags)
|
|
{
|
|
struct xpc_openclose_args *args = ch->local_openclose_args;
|
|
|
|
|
|
args->remote_nentries = ch->remote_nentries;
|
|
args->local_nentries = ch->local_nentries;
|
|
args->local_msgqueue_pa = __pa(ch->local_msgqueue);
|
|
|
|
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags);
|
|
}
|
|
|
|
static inline void
|
|
xpc_IPI_send_msgrequest(struct xpc_channel *ch)
|
|
{
|
|
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL);
|
|
}
|
|
|
|
static inline void
|
|
xpc_IPI_send_local_msgrequest(struct xpc_channel *ch)
|
|
{
|
|
XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST);
|
|
}
|
|
|
|
|
|
/*
|
|
* Memory for XPC's AMO variables is allocated by the MSPEC driver. These
|
|
* pages are located in the lowest granule. The lowest granule uses 4k pages
|
|
* for cached references and an alternate TLB handler to never provide a
|
|
* cacheable mapping for the entire region. This will prevent speculative
|
|
* reading of cached copies of our lines from being issued which will cause
|
|
* a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
|
|
* (XP_MAX_PARTITIONS) AMO variables for message notification (xpc_main.c)
|
|
* and an additional 16 AMO variables for partition activation (xpc_hb.c).
|
|
*/
|
|
static inline AMO_t *
|
|
xpc_IPI_init(partid_t partid)
|
|
{
|
|
AMO_t *part_amo = xpc_vars->amos_page + partid;
|
|
|
|
|
|
xpc_IPI_receive(part_amo);
|
|
return part_amo;
|
|
}
|
|
|
|
|
|
|
|
static inline enum xpc_retval
|
|
xpc_map_bte_errors(bte_result_t error)
|
|
{
|
|
switch (error) {
|
|
case BTE_SUCCESS: return xpcSuccess;
|
|
case BTEFAIL_DIR: return xpcBteDirectoryError;
|
|
case BTEFAIL_POISON: return xpcBtePoisonError;
|
|
case BTEFAIL_WERR: return xpcBteWriteError;
|
|
case BTEFAIL_ACCESS: return xpcBteAccessError;
|
|
case BTEFAIL_PWERR: return xpcBtePWriteError;
|
|
case BTEFAIL_PRERR: return xpcBtePReadError;
|
|
case BTEFAIL_TOUT: return xpcBteTimeOutError;
|
|
case BTEFAIL_XTERR: return xpcBteXtalkError;
|
|
case BTEFAIL_NOTAVAIL: return xpcBteNotAvailable;
|
|
default: return xpcBteUnmappedError;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static inline void *
|
|
xpc_kmalloc_cacheline_aligned(size_t size, int flags, void **base)
|
|
{
|
|
/* see if kmalloc will give us cachline aligned memory by default */
|
|
*base = kmalloc(size, flags);
|
|
if (*base == NULL) {
|
|
return NULL;
|
|
}
|
|
if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
|
|
return *base;
|
|
}
|
|
kfree(*base);
|
|
|
|
/* nope, we'll have to do it ourselves */
|
|
*base = kmalloc(size + L1_CACHE_BYTES, flags);
|
|
if (*base == NULL) {
|
|
return NULL;
|
|
}
|
|
return (void *) L1_CACHE_ALIGN((u64) *base);
|
|
}
|
|
|
|
|
|
/*
|
|
* Check to see if there is any channel activity to/from the specified
|
|
* partition.
|
|
*/
|
|
static inline void
|
|
xpc_check_for_channel_activity(struct xpc_partition *part)
|
|
{
|
|
u64 IPI_amo;
|
|
unsigned long irq_flags;
|
|
|
|
|
|
IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va);
|
|
if (IPI_amo == 0) {
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&part->IPI_lock, irq_flags);
|
|
part->local_IPI_amo |= IPI_amo;
|
|
spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
|
|
|
|
dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n",
|
|
XPC_PARTID(part), IPI_amo);
|
|
|
|
xpc_wakeup_channel_mgr(part);
|
|
}
|
|
|
|
|
|
#endif /* _IA64_SN_KERNEL_XPC_H */
|
|
|