2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
10 * Cross Partition Communication (XPC) structures and macros.
13 #ifndef _DRIVERS_MISC_SGIXP_XPC_H
14 #define _DRIVERS_MISC_SGIXP_XPC_H
16 #include <linux/interrupt.h>
17 #include <linux/sysctl.h>
18 #include <linux/device.h>
19 #include <linux/mutex.h>
20 #include <linux/completion.h>
21 #include <asm/pgtable.h>
22 #include <asm/processor.h>
23 #include <asm/sn/clksupport.h>
24 #include <asm/sn/addrs.h>
25 #include <asm/sn/mspec.h>
26 #include <asm/sn/shub_mmr.h>
30 * XPC Version numbers consist of a major and minor number. XPC can always
31 * talk to versions with same major #, and never talk to versions with a
34 #define _XPC_VERSION(_maj, _min) (((_maj) << 4) | ((_min) & 0xf))
35 #define XPC_VERSION_MAJOR(_v) ((_v) >> 4)
36 #define XPC_VERSION_MINOR(_v) ((_v) & 0xf)
39 * The next macros define word or bit representations for given
40 * C-brick nasid in either the SAL provided bit array representing
41 * nasids in the partition/machine or the AMO_t array used for
42 * inter-partition initiation communications.
44 * For SN2 machines, C-Bricks are alway even numbered NASIDs. As
45 * such, some space will be saved by insisting that nasid information
46 * passed from SAL always be packed for C-Bricks and the
47 * cross-partition interrupts use the same packing scheme.
49 #define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2)
50 #define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1))
51 #define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \
52 (1UL << XPC_NASID_B_INDEX(_n)))
53 #define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2)
55 #define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */
56 #define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */
58 /* define the process name of HB checker and the CPU it is pinned to */
59 #define XPC_HB_CHECK_THREAD_NAME "xpc_hb"
60 #define XPC_HB_CHECK_CPU 0
62 /* define the process name of the discovery thread */
63 #define XPC_DISCOVERY_THREAD_NAME "xpc_discovery"
68 * SAL reserves one page of memory per partition for XPC. Though a full page
69 * in length (16384 bytes), its starting address is not page aligned, but it
70 * is cacheline aligned. The reserved page consists of the following:
72 * reserved page header
74 * The first two 64-byte cachelines of the reserved page contain the
75 * header (struct xpc_rsvd_page). Before SAL initialization has completed,
76 * SAL has set up the following fields of the reserved page header:
77 * SAL_signature, SAL_version, SAL_partid, and SAL_nasids_size. The
78 * other fields are set up by XPC. (xpc_rsvd_page points to the local
79 * partition's reserved page.)
84 * SAL also sets up two bitmaps (or masks), one that reflects the actual
85 * nasids in this partition (part_nasids), and the other that reflects
86 * the actual nasids in the entire machine (mach_nasids). We're only
87 * interested in the even numbered nasids (which contain the processors
88 * and/or memory), so we only need half as many bits to represent the
89 * nasids. The part_nasids mask is located starting at the first cacheline
90 * following the reserved page header. The mach_nasids mask follows right
91 * after the part_nasids mask. The size in bytes of each mask is reflected
92 * by the reserved page header field 'SAL_nasids_size'. (Local partition's
93 * mask pointers are xpc_part_nasids and xpc_mach_nasids.)
95 * vars (ia64-sn2 only)
96 * vars part (ia64-sn2 only)
98 * Immediately following the mach_nasids mask are the XPC variables
99 * required by other partitions. First are those that are generic to all
100 * partitions (vars), followed on the next available cacheline by those
101 * which are partition specific (vars part). These are setup by XPC.
102 * (Local partition's vars pointers are xpc_vars and xpc_vars_part.)
104 * Note: Until 'stamp' is set non-zero, the partition XPC code has not been
107 struct xpc_rsvd_page {
108 u64 SAL_signature; /* SAL: unique signature */
109 u64 SAL_version; /* SAL: version */
110 short SAL_partid; /* SAL: partition ID */
111 short max_npartitions; /* value of XPC_MAX_PARTITIONS */
113 u8 pad1[3]; /* align to next u64 in 1st 64-byte cacheline */
115 u64 vars_pa; /* physical address of struct xpc_vars */
116 u64 activate_mq_gpa; /* global phys address of activate_mq */
118 unsigned long stamp; /* time when reserved page was setup by XPC */
119 u64 pad2[10]; /* align to last u64 in 2nd 64-byte cacheline */
120 u64 SAL_nasids_size; /* SAL: size of each nasid mask in bytes */
123 #define XPC_RP_VERSION _XPC_VERSION(2, 0) /* version 2.0 of the reserved page */
126 * Define the structures by which XPC variables can be exported to other
127 * partitions. (There are two: struct xpc_vars and struct xpc_vars_part)
131 * The following structure describes the partition generic variables
132 * needed by other partitions in order to properly initialize.
134 * struct xpc_vars version number also applies to struct xpc_vars_part.
135 * Changes to either structure and/or related functionality should be
136 * reflected by incrementing either the major or minor version numbers
137 * of struct xpc_vars.
139 struct xpc_vars_sn2 {
142 DECLARE_BITMAP(heartbeating_to_mask, XP_MAX_NPARTITIONS_SN2);
143 u64 heartbeat_offline; /* if 0, heartbeat should be changing */
144 int activate_IRQ_nasid;
145 int activate_IRQ_phys_cpuid;
147 u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */
148 AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */
151 #define XPC_V_VERSION _XPC_VERSION(3, 1) /* version 3.1 of the cross vars */
154 * The following pertains to ia64-sn2 only.
156 * Memory for XPC's AMO variables is allocated by the MSPEC driver. These
157 * pages are located in the lowest granule. The lowest granule uses 4k pages
158 * for cached references and an alternate TLB handler to never provide a
159 * cacheable mapping for the entire region. This will prevent speculative
160 * reading of cached copies of our lines from being issued which will cause
161 * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
162 * AMO variables (based on XP_MAX_NPARTITIONS_SN2) to identify the senders of
163 * NOTIFY IRQs, 128 AMO variables (based on XP_NASID_MASK_WORDS) to identify
164 * the senders of ACTIVATE IRQs, 1 AMO variable to identify which remote
165 * partitions (i.e., XPCs) consider themselves currently engaged with the
166 * local XPC and 1 AMO variable to request partition deactivation.
168 #define XPC_NOTIFY_IRQ_AMOS 0
169 #define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_NPARTITIONS_SN2)
170 #define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS)
171 #define XPC_DEACTIVATE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1)
174 * The following structure describes the per partition specific variables.
176 * An array of these structures, one per partition, will be defined. As a
177 * partition becomes active XPC will copy the array entry corresponding to
178 * itself from that partition. It is desirable that the size of this structure
179 * evenly divides into a 128-byte cacheline, such that none of the entries in
180 * this array crosses a 128-byte cacheline boundary. As it is now, each entry
183 struct xpc_vars_part_sn2 {
186 u64 openclose_args_pa; /* physical address of open and close args */
187 u64 GPs_pa; /* physical address of Get/Put values */
189 u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */
190 int IPI_nasid; /* nasid of where to send IPIs */
191 int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */
193 u8 nchannels; /* #of defined channels supported */
195 u8 reserved[23]; /* pad to a full 64 bytes */
199 * The vars_part MAGIC numbers play a part in the first contact protocol.
201 * MAGIC1 indicates that the per partition specific variables for a remote
202 * partition have been initialized by this partition.
204 * MAGIC2 indicates that this partition has pulled the remote partititions
205 * per partition variables that pertain to this partition.
207 #define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */
208 #define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */
210 /* the reserved page sizes and offsets */
212 #define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page))
213 #define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars_sn2))
215 #define XPC_RP_PART_NASIDS(_rp) ((u64 *)((u8 *)(_rp) + XPC_RP_HEADER_SIZE))
216 #define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words)
217 #define XPC_RP_VARS(_rp) ((struct xpc_vars_sn2 *)(XPC_RP_MACH_NASIDS(_rp) + \
218 xp_nasid_mask_words))
221 * Functions registered by add_timer() or called by kernel_thread() only
222 * allow for a single 64-bit argument. The following macros can be used to
223 * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from
224 * the passed argument.
226 #define XPC_PACK_ARGS(_arg1, _arg2) \
227 ((((u64) _arg1) & 0xffffffff) | \
228 ((((u64) _arg2) & 0xffffffff) << 32))
230 #define XPC_UNPACK_ARG1(_args) (((u64) _args) & 0xffffffff)
231 #define XPC_UNPACK_ARG2(_args) ((((u64) _args) >> 32) & 0xffffffff)
234 * Define a Get/Put value pair (pointers) used with a message queue.
237 s64 get; /* Get value */
238 s64 put; /* Put value */
241 #define XPC_GP_SIZE \
242 L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_MAX_NCHANNELS)
245 * Define a structure that contains arguments associated with opening and
248 struct xpc_openclose_args {
249 u16 reason; /* reason why channel is closing */
250 u16 msg_size; /* sizeof each message entry */
251 u16 remote_nentries; /* #of message entries in remote msg queue */
252 u16 local_nentries; /* #of message entries in local msg queue */
253 u64 local_msgqueue_pa; /* physical address of local message queue */
256 #define XPC_OPENCLOSE_ARGS_SIZE \
257 L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \
260 /* struct xpc_msg flags */
262 #define XPC_M_DONE 0x01 /* msg has been received/consumed */
263 #define XPC_M_READY 0x02 /* msg is ready to be sent */
264 #define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */
266 #define XPC_MSG_ADDRESS(_payload) \
267 ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET))
270 * Defines notify entry.
272 * This is used to notify a message's sender that their message was received
273 * and consumed by the intended recipient.
276 u8 type; /* type of notification */
278 /* the following two fields are only used if type == XPC_N_CALL */
279 xpc_notify_func func; /* user's notify function */
280 void *key; /* pointer to user's key */
283 /* struct xpc_notify type of notification */
285 #define XPC_N_CALL 0x01 /* notify function provided by user */
288 * Define the structure that manages all the stuff required by a channel. In
289 * particular, they are used to manage the messages sent across the channel.
291 * This structure is private to a partition, and is NOT shared across the
292 * partition boundary.
294 * There is an array of these structures for each remote partition. It is
295 * allocated at the time a partition becomes active. The array contains one
296 * of these structures for each potential channel connection to that partition.
299 * Each of these structures manages two message queues (circular buffers).
300 * They are allocated at the time a channel connection is made. One of
301 * these message queues (local_msgqueue) holds the locally created messages
302 * that are destined for the remote partition. The other of these message
303 * queues (remote_msgqueue) is a locally cached copy of the remote partition's
304 * own local_msgqueue.
306 * The following is a description of the Get/Put pointers used to manage these
307 * two message queues. Consider the local_msgqueue to be on one partition
308 * and the remote_msgqueue to be its cached copy on another partition. A
309 * description of what each of the lettered areas contains is included.
312 * local_msgqueue remote_msgqueue
314 * |/////////| |/////////|
315 * w_remote_GP.get --> +---------+ |/////////|
317 * remote_GP.get --> +---------+ +---------+ <-- local_GP->get
321 * | | +---------+ <-- w_local_GP.get
325 * | | +---------+ <-- w_remote_GP.put
327 * local_GP->put --> +---------+ +---------+ <-- remote_GP.put
331 * w_local_GP.put --> +---------+ |/////////|
332 * |/////////| |/////////|
335 * ( remote_GP.[get|put] are cached copies of the remote
336 * partition's local_GP->[get|put], and thus their values can
337 * lag behind their counterparts on the remote partition. )
340 * A - Messages that have been allocated, but have not yet been sent to the
343 * B - Messages that have been sent, but have not yet been acknowledged by the
344 * remote partition as having been received.
346 * C - Area that needs to be prepared for the copying of sent messages, by
347 * the clearing of the message flags of any previously received messages.
349 * D - Area into which sent messages are to be copied from the remote
350 * partition's local_msgqueue and then delivered to their intended
351 * recipients. [ To allow for a multi-message copy, another pointer
352 * (next_msg_to_pull) has been added to keep track of the next message
353 * number needing to be copied (pulled). It chases after w_remote_GP.put.
354 * Any messages lying between w_local_GP.get and next_msg_to_pull have
355 * been copied and are ready to be delivered. ]
357 * E - Messages that have been copied and delivered, but have not yet been
358 * acknowledged by the recipient as having been received.
360 * F - Messages that have been acknowledged, but XPC has not yet notified the
361 * sender that the message was received by its intended recipient.
362 * This is also an area that needs to be prepared for the allocating of
363 * new messages, by the clearing of the message flags of the acknowledged
366 struct xpc_channel_sn2 {
368 /* various flavors of local and remote Get/Put values */
370 struct xpc_gp *local_GP; /* local Get/Put values */
371 struct xpc_gp remote_GP; /* remote Get/Put values */
372 struct xpc_gp w_local_GP; /* working local Get/Put values */
373 struct xpc_gp w_remote_GP; /* working remote Get/Put values */
374 s64 next_msg_to_pull; /* Put value of next msg to pull */
376 struct mutex msg_to_pull_mutex; /* next msg to pull serialization */
379 struct xpc_channel_uv {
380 /* >>> code is coming */
384 short partid; /* ID of remote partition connected */
385 spinlock_t lock; /* lock for updating this structure */
386 u32 flags; /* general flags */
388 enum xp_retval reason; /* reason why channel is disconnect'g */
389 int reason_line; /* line# disconnect initiated from */
391 u16 number; /* channel # */
393 u16 msg_size; /* sizeof each msg entry */
394 u16 local_nentries; /* #of msg entries in local msg queue */
395 u16 remote_nentries; /* #of msg entries in remote msg queue */
397 void *local_msgqueue_base; /* base address of kmalloc'd space */
398 struct xpc_msg *local_msgqueue; /* local message queue */
399 void *remote_msgqueue_base; /* base address of kmalloc'd space */
400 struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */
401 /* local message queue */
402 u64 remote_msgqueue_pa; /* phys addr of remote partition's */
403 /* local message queue */
405 atomic_t references; /* #of external references to queues */
407 atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */
408 wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */
410 u8 delayed_IPI_flags; /* IPI flags received, but delayed */
411 /* action until channel disconnected */
413 /* queue of msg senders who want to be notified when msg received */
415 atomic_t n_to_notify; /* #of msg senders to notify */
416 struct xpc_notify *notify_queue; /* notify queue for messages sent */
418 xpc_channel_func func; /* user's channel function */
419 void *key; /* pointer to user's key */
421 struct completion wdisconnect_wait; /* wait for channel disconnect */
423 struct xpc_openclose_args *local_openclose_args; /* args passed on */
424 /* opening or closing of channel */
426 /* kthread management related fields */
428 atomic_t kthreads_assigned; /* #of kthreads assigned to channel */
429 u32 kthreads_assigned_limit; /* limit on #of kthreads assigned */
430 atomic_t kthreads_idle; /* #of kthreads idle waiting for work */
431 u32 kthreads_idle_limit; /* limit on #of kthreads idle */
432 atomic_t kthreads_active; /* #of kthreads actively working */
434 wait_queue_head_t idle_wq; /* idle kthread wait queue */
437 struct xpc_channel_sn2 sn2;
438 struct xpc_channel_uv uv;
441 } ____cacheline_aligned;
443 /* struct xpc_channel flags */
445 #define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */
447 #define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */
448 #define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */
449 #define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */
450 #define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */
452 #define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */
453 #define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */
454 #define XPC_C_CONNECTEDCALLOUT_MADE \
455 0x00000080 /* connected callout completed */
456 #define XPC_C_CONNECTED 0x00000100 /* local channel is connected */
457 #define XPC_C_CONNECTING 0x00000200 /* channel is being connected */
459 #define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */
460 #define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */
461 #define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */
462 #define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */
464 #define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */
465 #define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */
466 #define XPC_C_DISCONNECTINGCALLOUT \
467 0x00010000 /* disconnecting callout initiated */
468 #define XPC_C_DISCONNECTINGCALLOUT_MADE \
469 0x00020000 /* disconnecting callout completed */
470 #define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */
473 * Manages channels on a partition basis. There is one of these structures
474 * for each partition (a partition will never utilize the structure that
475 * represents itself).
478 struct xpc_partition_sn2 {
479 u64 remote_amos_page_pa; /* phys addr of partition's amos page */
480 int activate_IRQ_nasid; /* active partition's act/deact nasid */
481 int activate_IRQ_phys_cpuid; /* active part's act/deact phys cpuid */
483 u64 remote_vars_pa; /* phys addr of partition's vars */
484 u64 remote_vars_part_pa; /* phys addr of partition's vars part */
485 u8 remote_vars_version; /* version# of partition's vars */
487 void *local_GPs_base; /* base address of kmalloc'd space */
488 struct xpc_gp *local_GPs; /* local Get/Put values */
489 void *remote_GPs_base; /* base address of kmalloc'd space */
490 struct xpc_gp *remote_GPs; /* copy of remote partition's local */
492 u64 remote_GPs_pa; /* phys address of remote partition's local */
495 u64 remote_openclose_args_pa; /* phys addr of remote's args */
497 int remote_IPI_nasid; /* nasid of where to send IPIs */
498 int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */
499 char IPI_owner[8]; /* IPI owner's name */
501 AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */
502 AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */
504 struct timer_list dropped_notify_IRQ_timer; /* dropped IRQ timer */
507 struct xpc_partition_uv {
508 /* >>> code is coming */
511 struct xpc_partition {
513 /* XPC HB infrastructure */
515 u8 remote_rp_version; /* version# of partition's rsvd pg */
516 unsigned long remote_rp_stamp; /* time when rsvd pg was initialized */
517 u64 remote_rp_pa; /* phys addr of partition's rsvd pg */
518 u64 last_heartbeat; /* HB at last read */
519 u32 activate_IRQ_rcvd; /* IRQs since activation */
520 spinlock_t act_lock; /* protect updating of act_state */
521 u8 act_state; /* from XPC HB viewpoint */
522 enum xp_retval reason; /* reason partition is deactivating */
523 int reason_line; /* line# deactivation initiated from */
525 unsigned long disengage_timeout; /* timeout in jiffies */
526 struct timer_list disengage_timer;
528 /* XPC infrastructure referencing and teardown control */
530 u8 setup_state; /* infrastructure setup state */
531 wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */
532 atomic_t references; /* #of references to infrastructure */
534 u8 nchannels; /* #of defined channels supported */
535 atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */
536 atomic_t nchannels_engaged; /* #of channels engaged with remote part */
537 struct xpc_channel *channels; /* array of channel structures */
539 /* fields used to pass args when opening or closing a channel */
541 void *local_openclose_args_base; /* base address of kmalloc'd space */
542 struct xpc_openclose_args *local_openclose_args; /* local's args */
543 void *remote_openclose_args_base; /* base address of kmalloc'd space */
544 struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
547 /* IPI sending, receiving and handling related fields */
549 u64 local_IPI_amo; /* IPI amo flags yet to be handled */
550 spinlock_t IPI_lock; /* IPI handler lock */
552 /* channel manager related fields */
554 atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */
555 wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */
558 struct xpc_partition_sn2 sn2;
559 struct xpc_partition_uv uv;
562 } ____cacheline_aligned;
564 /* struct xpc_partition act_state values (for XPC HB) */
566 #define XPC_P_INACTIVE 0x00 /* partition is not active */
567 #define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */
568 #define XPC_P_ACTIVATING 0x02 /* activation thread started */
569 #define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */
570 #define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */
572 #define XPC_DEACTIVATE_PARTITION(_p, _reason) \
573 xpc_deactivate_partition(__LINE__, (_p), (_reason))
575 /* struct xpc_partition setup_state values */
577 #define XPC_P_UNSET 0x00 /* infrastructure was never setup */
578 #define XPC_P_SETUP 0x01 /* infrastructure is setup */
579 #define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */
580 #define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */
583 * struct xpc_partition IPI_timer #of seconds to wait before checking for
584 * dropped IPIs. These occur whenever an IPI amo write doesn't complete until
585 * after the IPI was received.
587 #define XPC_P_DROPPED_IPI_WAIT_INTERVAL (0.25 * HZ)
589 /* number of seconds to wait for other partitions to disengage */
590 #define XPC_DISENGAGE_DEFAULT_TIMELIMIT 90
592 /* interval in seconds to print 'waiting deactivation' messages */
593 #define XPC_DEACTIVATE_PRINTMSG_INTERVAL 10
595 #define XPC_PARTID(_p) ((short)((_p) - &xpc_partitions[0]))
597 /* found in xp_main.c */
598 extern struct xpc_registration xpc_registrations[];
600 /* found in xpc_main.c */
601 extern struct device *xpc_part;
602 extern struct device *xpc_chan;
603 extern int xpc_disengage_timelimit;
604 extern int xpc_disengage_timedout;
605 extern atomic_t xpc_activate_IRQ_rcvd;
606 extern wait_queue_head_t xpc_activate_IRQ_wq;
607 extern void *xpc_heartbeating_to_mask;
608 extern void xpc_activate_partition(struct xpc_partition *);
609 extern void xpc_activate_kthreads(struct xpc_channel *, int);
610 extern void xpc_create_kthreads(struct xpc_channel *, int, int);
611 extern void xpc_disconnect_wait(int);
612 extern enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *);
613 extern void (*xpc_heartbeat_init) (void);
614 extern void (*xpc_heartbeat_exit) (void);
615 extern void (*xpc_increment_heartbeat) (void);
616 extern void (*xpc_offline_heartbeat) (void);
617 extern void (*xpc_online_heartbeat) (void);
618 extern void (*xpc_check_remote_hb) (void);
619 extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *);
620 extern u64 (*xpc_get_IPI_flags) (struct xpc_partition *);
621 extern void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *);
622 extern void (*xpc_process_msg_IPI) (struct xpc_partition *, int);
623 extern int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *);
624 extern struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *);
625 extern void (*xpc_request_partition_activation) (struct xpc_rsvd_page *, u64,
627 extern void (*xpc_request_partition_reactivation) (struct xpc_partition *);
628 extern void (*xpc_request_partition_deactivation) (struct xpc_partition *);
629 extern void (*xpc_cancel_partition_deactivation_request) (
630 struct xpc_partition *);
631 extern void (*xpc_process_activate_IRQ_rcvd) (int);
632 extern enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *);
633 extern void (*xpc_teardown_infrastructure) (struct xpc_partition *);
635 extern void (*xpc_indicate_partition_engaged) (struct xpc_partition *);
636 extern int (*xpc_partition_engaged) (short);
637 extern int (*xpc_any_partition_engaged) (void);
638 extern void (*xpc_indicate_partition_disengaged) (struct xpc_partition *);
639 extern void (*xpc_assume_partition_disengaged) (short);
641 extern void (*xpc_send_channel_closerequest) (struct xpc_channel *,
643 extern void (*xpc_send_channel_closereply) (struct xpc_channel *,
645 extern void (*xpc_send_channel_openrequest) (struct xpc_channel *,
647 extern void (*xpc_send_channel_openreply) (struct xpc_channel *,
650 extern enum xp_retval (*xpc_send_msg) (struct xpc_channel *, u32, void *, u16,
651 u8, xpc_notify_func, void *);
652 extern void (*xpc_received_msg) (struct xpc_channel *, struct xpc_msg *);
654 /* found in xpc_sn2.c */
655 extern int xpc_init_sn2(void);
656 extern void xpc_exit_sn2(void);
658 /* found in xpc_uv.c */
659 extern void xpc_init_uv(void);
660 extern void xpc_exit_uv(void);
662 /* found in xpc_partition.c */
663 extern int xpc_exiting;
664 extern int xp_nasid_mask_words;
665 extern struct xpc_rsvd_page *xpc_rsvd_page;
666 extern u64 *xpc_mach_nasids;
667 extern struct xpc_partition *xpc_partitions;
668 extern char *xpc_remote_copy_buffer;
669 extern void *xpc_remote_copy_buffer_base;
670 extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
671 extern struct xpc_rsvd_page *xpc_setup_rsvd_page(void);
672 extern int xpc_identify_activate_IRQ_sender(void);
673 extern int xpc_partition_disengaged(struct xpc_partition *);
674 extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *);
675 extern void xpc_mark_partition_inactive(struct xpc_partition *);
676 extern void xpc_discovery(void);
677 extern enum xp_retval xpc_get_remote_rp(int, u64 *, struct xpc_rsvd_page *,
679 extern void xpc_deactivate_partition(const int, struct xpc_partition *,
681 extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *);
683 /* found in xpc_channel.c */
684 extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **);
685 extern void xpc_initiate_connect(int);
686 extern void xpc_initiate_disconnect(int);
687 extern enum xp_retval xpc_allocate_msg_wait(struct xpc_channel *);
688 extern enum xp_retval xpc_initiate_send(short, int, u32, void *, u16);
689 extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16,
690 xpc_notify_func, void *);
691 extern void xpc_initiate_received(short, int, void *);
692 extern void xpc_process_channel_activity(struct xpc_partition *);
693 extern void xpc_connected_callout(struct xpc_channel *);
694 extern void xpc_deliver_msg(struct xpc_channel *);
695 extern void xpc_disconnect_channel(const int, struct xpc_channel *,
696 enum xp_retval, unsigned long *);
697 extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval);
698 extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval);
701 xpc_hb_allowed(short partid, void *heartbeating_to_mask)
703 return test_bit(partid, heartbeating_to_mask);
707 xpc_any_hbs_allowed(void)
709 DBUG_ON(xpc_heartbeating_to_mask == NULL);
710 return !bitmap_empty(xpc_heartbeating_to_mask, xp_max_npartitions);
714 xpc_allow_hb(short partid)
716 DBUG_ON(xpc_heartbeating_to_mask == NULL);
717 set_bit(partid, xpc_heartbeating_to_mask);
721 xpc_disallow_hb(short partid)
723 DBUG_ON(xpc_heartbeating_to_mask == NULL);
724 clear_bit(partid, xpc_heartbeating_to_mask);
728 xpc_disallow_all_hbs(void)
730 DBUG_ON(xpc_heartbeating_to_mask == NULL);
731 bitmap_zero(xpc_heartbeating_to_mask, xp_max_npartitions);
735 xpc_wakeup_channel_mgr(struct xpc_partition *part)
737 if (atomic_inc_return(&part->channel_mgr_requests) == 1)
738 wake_up(&part->channel_mgr_wq);
742 * These next two inlines are used to keep us from tearing down a channel's
743 * msg queues while a thread may be referencing them.
746 xpc_msgqueue_ref(struct xpc_channel *ch)
748 atomic_inc(&ch->references);
752 xpc_msgqueue_deref(struct xpc_channel *ch)
754 s32 refs = atomic_dec_return(&ch->references);
758 xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]);
761 #define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \
762 xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs)
765 * These two inlines are used to keep us from tearing down a partition's
766 * setup infrastructure while a thread may be referencing it.
769 xpc_part_deref(struct xpc_partition *part)
771 s32 refs = atomic_dec_return(&part->references);
774 if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN)
775 wake_up(&part->teardown_wq);
779 xpc_part_ref(struct xpc_partition *part)
783 atomic_inc(&part->references);
784 setup = (part->setup_state == XPC_P_SETUP);
786 xpc_part_deref(part);
792 * The following macro is to be used for the setting of the reason and
793 * reason_line fields in both the struct xpc_channel and struct xpc_partition
796 #define XPC_SET_REASON(_p, _reason, _line) \
798 (_p)->reason = _reason; \
799 (_p)->reason_line = _line; \
803 * The sending and receiving of IPIs includes the setting of an >>>AMO variable
804 * to indicate the reason the IPI was sent. The 64-bit variable is divided
805 * up into eight bytes, ordered from right to left. Byte zero pertains to
806 * channel 0, byte one to channel 1, and so on. Each byte is described by
807 * the following IPI flags.
810 #define XPC_IPI_CLOSEREQUEST 0x01
811 #define XPC_IPI_CLOSEREPLY 0x02
812 #define XPC_IPI_OPENREQUEST 0x04
813 #define XPC_IPI_OPENREPLY 0x08
814 #define XPC_IPI_MSGREQUEST 0x10
816 /* given an >>>AMO variable and a channel#, get its associated IPI flags */
817 #define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff))
818 #define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8))
820 #define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0fUL)
821 #define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & 0x1010101010101010UL)
823 #endif /* _DRIVERS_MISC_SGIXP_XPC_H */