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linux/include/asm-ia64/sn/xpc.h
Dean Nelson a460ef8d0a [IA64] fix possible XPC deadlock when disconnecting 
This patch eliminates a potential deadlock that is possible when XPC
disconnects a channel to a partition that has gone down. This deadlock will
occur if at least one of the kthreads created by XPC for the purpose of making
callouts to the channel's registerer is detained in the registerer and will
not be returning back to XPC until some registerer request occurs on the now
downed partition. The potential for a deadlock is removed by ensuring that
there always is a kthread available to make the channel disconnecting callout
to the registerer.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2006-12-12 11:48:53 -08:00

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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) 2004-2006 Silicon Graphics, Inc. All Rights Reserved.
*/
/*
* Cross Partition Communication (XPC) structures and macros.
*/
#ifndef _ASM_IA64_SN_XPC_H
#define _ASM_IA64_SN_XPC_H
#include <linux/interrupt.h>
#include <linux/sysctl.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/completion.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_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 cacheline of the reserved page contains 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, partid, and 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. 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 'nasids_size'. (Local partition's
* mask pointers are xpc_part_nasids and xpc_mach_nasids.)
*
* vars
* vars part
*
* 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.
* (Local partition's vars pointers are xpc_vars and xpc_vars_part.)
*
* 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: version */
u8 partid; /* SAL: partition ID */
u8 version;
u8 pad1[6]; /* align to next u64 in cacheline */
volatile u64 vars_pa;
struct timespec stamp; /* time when reserved page was setup by XPC */
u64 pad2[9]; /* align to last u64 in cacheline */
u64 nasids_size; /* SAL: size of each nasid mask in bytes */
};
#define XPC_RP_VERSION _XPC_VERSION(1,1) /* version 1.1 of the reserved page */
#define XPC_SUPPORTS_RP_STAMP(_version) \
(_version >= _XPC_VERSION(1,1))
/*
* compare stamps - the return value is:
*
* < 0, if stamp1 < stamp2
* = 0, if stamp1 == stamp2
* > 0, if stamp1 > stamp2
*/
static inline int
xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2)
{
int ret;
if ((ret = stamp1->tv_sec - stamp2->tv_sec) == 0) {
ret = stamp1->tv_nsec - stamp2->tv_nsec;
}
return ret;
}
/*
* 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 heartbeat_offline; /* if 0, heartbeat should be changing */
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 */
};
#define XPC_V_VERSION _XPC_VERSION(3,1) /* version 3.1 of the cross vars */
#define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \
(_version >= _XPC_VERSION(3,1))
static inline int
xpc_hb_allowed(partid_t partid, struct xpc_vars *vars)
{
return ((vars->heartbeating_to_mask & (1UL << partid)) != 0);
}
static inline void
xpc_allow_hb(partid_t partid, struct xpc_vars *vars)
{
u64 old_mask, new_mask;
do {
old_mask = vars->heartbeating_to_mask;
new_mask = (old_mask | (1UL << partid));
} while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) !=
old_mask);
}
static inline void
xpc_disallow_hb(partid_t partid, struct xpc_vars *vars)
{
u64 old_mask, new_mask;
do {
old_mask = vars->heartbeating_to_mask;
new_mask = (old_mask & ~(1UL << partid));
} while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) !=
old_mask);
}
/*
* The AMOs page consists of a number of AMO variables which are divided into
* four groups, The first two groups are used to identify an IRQ's sender.
* These two groups consist of 64 and 128 AMO variables respectively. The last
* two groups, consisting of just one AMO variable each, are used to identify
* the remote partitions that are currently engaged (from the viewpoint of
* the XPC running on the remote partition).
*/
#define XPC_NOTIFY_IRQ_AMOS 0
#define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_PARTITIONS)
#define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS)
#define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1)
/*
* 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 {
volatile 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) */
/* the reserved page sizes and offsets */
#define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page))
#define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars))
#define XPC_RP_PART_NASIDS(_rp) (u64 *) ((u8 *) _rp + XPC_RP_HEADER_SIZE)
#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words)
#define XPC_RP_VARS(_rp) ((struct xpc_vars *) XPC_RP_MACH_NASIDS(_rp) + xp_nasid_mask_words)
#define XPC_RP_VARS_PART(_rp) (struct xpc_vars_part *) ((u8 *) XPC_RP_VARS(rp) + XPC_RP_VARS_SIZE)
/*
* 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 {
volatile s64 get; /* Get value */
volatile 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 {
volatile 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 */
u8 delayed_IPI_flags; /* IPI flags received, but delayed */
/* action until channel disconnected */
/* 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 mutex msg_to_pull_mutex; /* next msg to pull serialization */
struct completion wdisconnect_wait; /* wait for channel disconnect */
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_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */
#define XPC_C_CONNECTEDCALLOUT_MADE \
0x00000080 /* connected callout completed */
#define XPC_C_CONNECTED 0x00000100 /* local channel is connected */
#define XPC_C_CONNECTING 0x00000200 /* channel is being connected */
#define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */
#define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */
#define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */
#define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */
#define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */
#define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */
#define XPC_C_DISCONNECTINGCALLOUT \
0x00010000 /* disconnecting callout initiated */
#define XPC_C_DISCONNECTINGCALLOUT_MADE \
0x00020000 /* disconnecting callout completed */
#define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */
/*
* 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 */
u8 remote_rp_version; /* version# of partition's rsvd pg */
struct timespec remote_rp_stamp;/* time when rsvd pg was initialized */
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 */
u8 remote_vars_version; /* version# of partition's vars */
enum xpc_retval reason; /* reason partition is deactivating */
int reason_line; /* line# deactivation initiated from */
int reactivate_nasid; /* nasid in partition to reactivate */
unsigned long disengage_request_timeout; /* timeout in jiffies */
struct timer_list disengage_request_timer;
/* XPC infrastructure referencing and teardown control */
volatile 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 */
atomic_t nchannels_engaged;/* #of channels engaged with remote part */
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)
/* number of seconds to wait for other partitions to disengage */
#define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90
/* interval in seconds to print 'waiting disengagement' messages */
#define XPC_DISENGAGE_PRINTMSG_INTERVAL 10
#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 */
extern struct device *xpc_part;
extern struct device *xpc_chan;
extern int xpc_disengage_request_timelimit;
extern int xpc_disengage_request_timedout;
extern irqreturn_t xpc_notify_IRQ_handler(int, void *);
extern void xpc_dropped_IPI_check(struct xpc_partition *);
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_partition.c */
extern int xpc_exiting;
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 void *xpc_remote_copy_buffer_base;
extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
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 int xpc_partition_disengaged(struct xpc_partition *);
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_disconnect_callout(struct xpc_channel *, enum xpc_retval);
extern void xpc_partition_going_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; \
}
/*
* This next set of inlines are used to keep track of when a partition is
* potentially engaged in accessing memory belonging to another partition.
*/
static inline void
xpc_mark_partition_engaged(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
(XPC_ENGAGED_PARTITIONS_AMO * sizeof(AMO_t)));
local_irq_save(irq_flags);
/* set bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR,
(1UL << sn_partition_id));
/*
* 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.
*/
(void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable), xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static inline void
xpc_mark_partition_disengaged(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
(XPC_ENGAGED_PARTITIONS_AMO * sizeof(AMO_t)));
local_irq_save(irq_flags);
/* clear bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
~(1UL << sn_partition_id));
/*
* 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.
*/
(void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable), xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static inline void
xpc_request_partition_disengage(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
(XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
local_irq_save(irq_flags);
/* set bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR,
(1UL << sn_partition_id));
/*
* 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.
*/
(void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable), xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static inline void
xpc_cancel_partition_disengage_request(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
(XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
local_irq_save(irq_flags);
/* clear bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
~(1UL << sn_partition_id));
/*
* 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.
*/
(void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable), xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static inline u64
xpc_partition_engaged(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
/* return our partition's AMO variable ANDed with partid_mask */
return (FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_LOAD) &
partid_mask);
}
static inline u64
xpc_partition_disengage_requested(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
/* return our partition's AMO variable ANDed with partid_mask */
return (FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_LOAD) &
partid_mask);
}
static inline void
xpc_clear_partition_engaged(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
/* clear bit(s) based on partid_mask in our partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
~partid_mask);
}
static inline void
xpc_clear_partition_disengage_request(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
/* clear bit(s) based on partid_mask in our partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
~partid_mask);
}
/*
* 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_pa, 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_pa +
(XPC_ACTIVATE_IRQ_AMOS * 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);
}
static inline void
xpc_IPI_send_disengage(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);
}
/*
* 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_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8))
#define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & __IA64_UL_CONST(0x0f0f0f0f0f0f0f0f))
#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & __IA64_UL_CONST(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
* AMO variables (based on XP_MAX_PARTITIONS) for message notification and an
* additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition
* activation and 2 AMO variables for partition deactivation.
*/
static inline AMO_t *
xpc_IPI_init(int index)
{
AMO_t *amo = xpc_vars->amos_page + index;
(void) xpc_IPI_receive(amo); /* clear AMO variable */
return 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;
}
}
/*
* 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 /* _ASM_IA64_SN_XPC_H */
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