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) 2008 Silicon Graphics, Inc. All Rights Reserved.
10 * Cross Partition Communication (XPC) sn2-based functions.
12 * Architecture specific implementation of common functions.
16 #include <linux/kernel.h>
17 #include <linux/delay.h>
18 #include <asm/uncached.h>
19 #include <asm/sn/sn_sal.h>
22 static struct xpc_vars_sn2
*xpc_vars
; /* >>> Add _sn2 suffix? */
23 static struct xpc_vars_part_sn2
*xpc_vars_part
; /* >>> Add _sn2 suffix? */
25 /* SH_IPI_ACCESS shub register value on startup */
26 static u64 xpc_sh1_IPI_access
;
27 static u64 xpc_sh2_IPI_access0
;
28 static u64 xpc_sh2_IPI_access1
;
29 static u64 xpc_sh2_IPI_access2
;
30 static u64 xpc_sh2_IPI_access3
;
33 * Change protections to allow IPI operations.
36 xpc_allow_IPI_ops_sn2(void)
41 /* >>> The following should get moved into SAL. */
44 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH2_IPI_ACCESS0
));
46 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH2_IPI_ACCESS1
));
48 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH2_IPI_ACCESS2
));
50 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH2_IPI_ACCESS3
));
52 for_each_online_node(node
) {
53 nasid
= cnodeid_to_nasid(node
);
54 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS0
),
56 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS1
),
58 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS2
),
60 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS3
),
65 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH1_IPI_ACCESS
));
67 for_each_online_node(node
) {
68 nasid
= cnodeid_to_nasid(node
);
69 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH1_IPI_ACCESS
),
76 * Restrict protections to disallow IPI operations.
79 xpc_disallow_IPI_ops_sn2(void)
84 /* >>> The following should get moved into SAL. */
86 for_each_online_node(node
) {
87 nasid
= cnodeid_to_nasid(node
);
88 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS0
),
90 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS1
),
92 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS2
),
94 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS3
),
98 for_each_online_node(node
) {
99 nasid
= cnodeid_to_nasid(node
);
100 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH1_IPI_ACCESS
),
107 * The following set of functions are used for the sending and receiving of
108 * IRQs (also known as IPIs). There are two flavors of IRQs, one that is
109 * associated with partition activity (SGI_XPC_ACTIVATE) and the other that
110 * is associated with channel activity (SGI_XPC_NOTIFY).
114 xpc_receive_IRQ_amo_sn2(AMO_t
*amo
)
116 return FETCHOP_LOAD_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_CLEAR
);
119 static enum xp_retval
120 xpc_send_IRQ_sn2(AMO_t
*amo
, u64 flag
, int nasid
, int phys_cpuid
, int vector
)
123 unsigned long irq_flags
;
125 local_irq_save(irq_flags
);
127 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_OR
, flag
);
128 sn_send_IPI_phys(nasid
, phys_cpuid
, vector
, 0);
131 * We must always use the nofault function regardless of whether we
132 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
133 * didn't, we'd never know that the other partition is down and would
134 * keep sending IRQs and AMOs to it until the heartbeat times out.
136 ret
= xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->variable
),
137 xp_nofault_PIOR_target
));
139 local_irq_restore(irq_flags
);
141 return ((ret
== 0) ? xpSuccess
: xpPioReadError
);
145 xpc_init_IRQ_amo_sn2(int index
)
147 AMO_t
*amo
= xpc_vars
->amos_page
+ index
;
149 (void)xpc_receive_IRQ_amo_sn2(amo
); /* clear AMO variable */
154 * Functions associated with SGI_XPC_ACTIVATE IRQ.
158 * Notify the heartbeat check thread that an activate IRQ has been received.
161 xpc_handle_activate_IRQ_sn2(int irq
, void *dev_id
)
163 atomic_inc(&xpc_activate_IRQ_rcvd
);
164 wake_up_interruptible(&xpc_activate_IRQ_wq
);
169 * Flag the appropriate AMO variable and send an IRQ to the specified node.
172 xpc_send_activate_IRQ_sn2(u64 amos_page_pa
, int from_nasid
, int to_nasid
,
175 int w_index
= XPC_NASID_W_INDEX(from_nasid
);
176 int b_index
= XPC_NASID_B_INDEX(from_nasid
);
177 AMO_t
*amos
= (AMO_t
*)__va(amos_page_pa
+
178 (XPC_ACTIVATE_IRQ_AMOS
* sizeof(AMO_t
)));
180 (void)xpc_send_IRQ_sn2(&amos
[w_index
], (1UL << b_index
), to_nasid
,
181 to_phys_cpuid
, SGI_XPC_ACTIVATE
);
185 xpc_send_local_activate_IRQ_sn2(int from_nasid
)
187 int w_index
= XPC_NASID_W_INDEX(from_nasid
);
188 int b_index
= XPC_NASID_B_INDEX(from_nasid
);
189 AMO_t
*amos
= (AMO_t
*)__va(xpc_vars
->amos_page_pa
+
190 (XPC_ACTIVATE_IRQ_AMOS
* sizeof(AMO_t
)));
192 /* fake the sending and receipt of an activate IRQ from remote nasid */
193 FETCHOP_STORE_OP(TO_AMO((u64
)&amos
[w_index
].variable
), FETCHOP_OR
,
195 atomic_inc(&xpc_activate_IRQ_rcvd
);
196 wake_up_interruptible(&xpc_activate_IRQ_wq
);
200 * Functions associated with SGI_XPC_NOTIFY IRQ.
204 * Check to see if any chctl flags were sent from the specified partition.
207 xpc_check_for_sent_chctl_flags_sn2(struct xpc_partition
*part
)
209 union xpc_channel_ctl_flags chctl
;
210 unsigned long irq_flags
;
212 chctl
.all_flags
= xpc_receive_IRQ_amo_sn2(part
->sn
.sn2
.
214 if (chctl
.all_flags
== 0)
217 spin_lock_irqsave(&part
->chctl_lock
, irq_flags
);
218 part
->chctl
.all_flags
|= chctl
.all_flags
;
219 spin_unlock_irqrestore(&part
->chctl_lock
, irq_flags
);
221 dev_dbg(xpc_chan
, "received notify IRQ from partid=%d, chctl.all_flags="
222 "0x%lx\n", XPC_PARTID(part
), chctl
.all_flags
);
224 xpc_wakeup_channel_mgr(part
);
228 * Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified
229 * partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more
230 * than one partition, we use an AMO_t structure per partition to indicate
231 * whether a partition has sent an IRQ or not. If it has, then wake up the
232 * associated kthread to handle it.
234 * All SGI_XPC_NOTIFY IRQs received by XPC are the result of IRQs sent by XPC
235 * running on other partitions.
237 * Noteworthy Arguments:
239 * irq - Interrupt ReQuest number. NOT USED.
241 * dev_id - partid of IRQ's potential sender.
244 xpc_handle_notify_IRQ_sn2(int irq
, void *dev_id
)
246 short partid
= (short)(u64
)dev_id
;
247 struct xpc_partition
*part
= &xpc_partitions
[partid
];
249 DBUG_ON(partid
< 0 || partid
>= xp_max_npartitions
);
251 if (xpc_part_ref(part
)) {
252 xpc_check_for_sent_chctl_flags_sn2(part
);
254 xpc_part_deref(part
);
260 * Check to see if xpc_handle_notify_IRQ_sn2() dropped any IRQs on the floor
261 * because the write to their associated amo variable completed after the IRQ
265 xpc_check_for_dropped_notify_IRQ_sn2(struct xpc_partition
*part
)
267 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
269 if (xpc_part_ref(part
)) {
270 xpc_check_for_sent_chctl_flags_sn2(part
);
272 part_sn2
->dropped_notify_IRQ_timer
.expires
= jiffies
+
273 XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL
;
274 add_timer(&part_sn2
->dropped_notify_IRQ_timer
);
275 xpc_part_deref(part
);
280 * Send a notify IRQ to the remote partition that is associated with the
284 xpc_send_notify_IRQ_sn2(struct xpc_channel
*ch
, u8 chctl_flag
,
285 char *chctl_flag_string
, unsigned long *irq_flags
)
287 struct xpc_partition
*part
= &xpc_partitions
[ch
->partid
];
288 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
289 union xpc_channel_ctl_flags chctl
= { 0 };
292 if (likely(part
->act_state
!= XPC_P_DEACTIVATING
)) {
293 chctl
.flags
[ch
->number
] = chctl_flag
;
294 ret
= xpc_send_IRQ_sn2(part_sn2
->remote_chctl_amo_va
,
296 part_sn2
->notify_IRQ_nasid
,
297 part_sn2
->notify_IRQ_phys_cpuid
,
299 dev_dbg(xpc_chan
, "%s sent to partid=%d, channel=%d, ret=%d\n",
300 chctl_flag_string
, ch
->partid
, ch
->number
, ret
);
301 if (unlikely(ret
!= xpSuccess
)) {
302 if (irq_flags
!= NULL
)
303 spin_unlock_irqrestore(&ch
->lock
, *irq_flags
);
304 XPC_DEACTIVATE_PARTITION(part
, ret
);
305 if (irq_flags
!= NULL
)
306 spin_lock_irqsave(&ch
->lock
, *irq_flags
);
311 #define XPC_SEND_NOTIFY_IRQ_SN2(_ch, _ipi_f, _irq_f) \
312 xpc_send_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f, _irq_f)
315 * Make it look like the remote partition, which is associated with the
316 * specified channel, sent us a notify IRQ. This faked IRQ will be handled
317 * by xpc_check_for_dropped_notify_IRQ_sn2().
320 xpc_send_local_notify_IRQ_sn2(struct xpc_channel
*ch
, u8 chctl_flag
,
321 char *chctl_flag_string
)
323 struct xpc_partition
*part
= &xpc_partitions
[ch
->partid
];
324 union xpc_channel_ctl_flags chctl
= { 0 };
326 chctl
.flags
[ch
->number
] = chctl_flag
;
327 FETCHOP_STORE_OP(TO_AMO((u64
)&part
->sn
.sn2
.local_chctl_amo_va
->
328 variable
), FETCHOP_OR
, chctl
.all_flags
);
329 dev_dbg(xpc_chan
, "%s sent local from partid=%d, channel=%d\n",
330 chctl_flag_string
, ch
->partid
, ch
->number
);
333 #define XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(_ch, _ipi_f) \
334 xpc_send_local_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f)
337 xpc_send_chctl_closerequest_sn2(struct xpc_channel
*ch
,
338 unsigned long *irq_flags
)
340 struct xpc_openclose_args
*args
= ch
->local_openclose_args
;
342 args
->reason
= ch
->reason
;
343 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_CLOSEREQUEST
, irq_flags
);
347 xpc_send_chctl_closereply_sn2(struct xpc_channel
*ch
, unsigned long *irq_flags
)
349 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_CLOSEREPLY
, irq_flags
);
353 xpc_send_chctl_openrequest_sn2(struct xpc_channel
*ch
, unsigned long *irq_flags
)
355 struct xpc_openclose_args
*args
= ch
->local_openclose_args
;
357 args
->msg_size
= ch
->msg_size
;
358 args
->local_nentries
= ch
->local_nentries
;
359 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_OPENREQUEST
, irq_flags
);
363 xpc_send_chctl_openreply_sn2(struct xpc_channel
*ch
, unsigned long *irq_flags
)
365 struct xpc_openclose_args
*args
= ch
->local_openclose_args
;
367 args
->remote_nentries
= ch
->remote_nentries
;
368 args
->local_nentries
= ch
->local_nentries
;
369 args
->local_msgqueue_pa
= __pa(ch
->local_msgqueue
);
370 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_OPENREPLY
, irq_flags
);
374 xpc_send_chctl_msgrequest_sn2(struct xpc_channel
*ch
)
376 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_MSGREQUEST
, NULL
);
380 xpc_send_chctl_local_msgrequest_sn2(struct xpc_channel
*ch
)
382 XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_MSGREQUEST
);
386 * This next set of functions are used to keep track of when a partition is
387 * potentially engaged in accessing memory belonging to another partition.
391 xpc_indicate_partition_engaged_sn2(struct xpc_partition
*part
)
393 unsigned long irq_flags
;
394 AMO_t
*amo
= (AMO_t
*)__va(part
->sn
.sn2
.remote_amos_page_pa
+
395 (XPC_ENGAGED_PARTITIONS_AMO
*
398 local_irq_save(irq_flags
);
400 /* set bit corresponding to our partid in remote partition's AMO */
401 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_OR
,
402 (1UL << sn_partition_id
));
404 * We must always use the nofault function regardless of whether we
405 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
406 * didn't, we'd never know that the other partition is down and would
407 * keep sending IRQs and AMOs to it until the heartbeat times out.
409 (void)xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->
411 xp_nofault_PIOR_target
));
413 local_irq_restore(irq_flags
);
417 xpc_indicate_partition_disengaged_sn2(struct xpc_partition
*part
)
419 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
420 unsigned long irq_flags
;
421 AMO_t
*amo
= (AMO_t
*)__va(part_sn2
->remote_amos_page_pa
+
422 (XPC_ENGAGED_PARTITIONS_AMO
*
425 local_irq_save(irq_flags
);
427 /* clear bit corresponding to our partid in remote partition's AMO */
428 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_AND
,
429 ~(1UL << sn_partition_id
));
431 * We must always use the nofault function regardless of whether we
432 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
433 * didn't, we'd never know that the other partition is down and would
434 * keep sending IRQs and AMOs to it until the heartbeat times out.
436 (void)xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->
438 xp_nofault_PIOR_target
));
440 local_irq_restore(irq_flags
);
443 * Send activate IRQ to get other side to see that we've cleared our
444 * bit in their engaged partitions AMO.
446 xpc_send_activate_IRQ_sn2(part_sn2
->remote_amos_page_pa
,
448 part_sn2
->activate_IRQ_nasid
,
449 part_sn2
->activate_IRQ_phys_cpuid
);
453 xpc_partition_engaged_sn2(short partid
)
455 AMO_t
*amo
= xpc_vars
->amos_page
+ XPC_ENGAGED_PARTITIONS_AMO
;
457 /* our partition's AMO variable ANDed with partid mask */
458 return (FETCHOP_LOAD_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_LOAD
) &
459 (1UL << partid
)) != 0;
463 xpc_any_partition_engaged_sn2(void)
465 AMO_t
*amo
= xpc_vars
->amos_page
+ XPC_ENGAGED_PARTITIONS_AMO
;
467 /* our partition's AMO variable */
468 return FETCHOP_LOAD_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_LOAD
) != 0;
472 xpc_assume_partition_disengaged_sn2(short partid
)
474 AMO_t
*amo
= xpc_vars
->amos_page
+ XPC_ENGAGED_PARTITIONS_AMO
;
476 /* clear bit(s) based on partid mask in our partition's AMO */
477 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_AND
,
481 /* original protection values for each node */
482 static u64 xpc_prot_vec_sn2
[MAX_NUMNODES
];
485 * Change protections to allow AMO operations on non-Shub 1.1 systems.
487 static enum xp_retval
488 xpc_allow_AMO_ops_sn2(AMO_t
*amos_page
)
494 * On SHUB 1.1, we cannot call sn_change_memprotect() since the BIST
495 * collides with memory operations. On those systems we call
496 * xpc_allow_AMO_ops_shub_wars_1_1_sn2() instead.
498 if (!enable_shub_wars_1_1()) {
499 ret
= sn_change_memprotect(ia64_tpa((u64
)amos_page
), PAGE_SIZE
,
500 SN_MEMPROT_ACCESS_CLASS_1
,
509 * Change protections to allow AMO operations on Shub 1.1 systems.
512 xpc_allow_AMO_ops_shub_wars_1_1_sn2(void)
517 if (!enable_shub_wars_1_1())
520 for_each_online_node(node
) {
521 nasid
= cnodeid_to_nasid(node
);
522 /* save current protection values */
523 xpc_prot_vec_sn2
[node
] =
524 (u64
)HUB_L((u64
*)GLOBAL_MMR_ADDR(nasid
,
525 SH1_MD_DQLP_MMR_DIR_PRIVEC0
));
526 /* open up everything */
527 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
,
528 SH1_MD_DQLP_MMR_DIR_PRIVEC0
),
530 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
,
531 SH1_MD_DQRP_MMR_DIR_PRIVEC0
),
536 static enum xp_retval
537 xpc_rsvd_page_init_sn2(struct xpc_rsvd_page
*rp
)
543 xpc_vars
= XPC_RP_VARS(rp
);
545 rp
->sn
.vars_pa
= __pa(xpc_vars
);
547 /* vars_part array follows immediately after vars */
548 xpc_vars_part
= (struct xpc_vars_part_sn2
*)((u8
*)XPC_RP_VARS(rp
) +
552 * Before clearing xpc_vars, see if a page of AMOs had been previously
553 * allocated. If not we'll need to allocate one and set permissions
554 * so that cross-partition AMOs are allowed.
556 * The allocated AMO page needs MCA reporting to remain disabled after
557 * XPC has unloaded. To make this work, we keep a copy of the pointer
558 * to this page (i.e., amos_page) in the struct xpc_vars structure,
559 * which is pointed to by the reserved page, and re-use that saved copy
560 * on subsequent loads of XPC. This AMO page is never freed, and its
561 * memory protections are never restricted.
563 amos_page
= xpc_vars
->amos_page
;
564 if (amos_page
== NULL
) {
565 amos_page
= (AMO_t
*)TO_AMO(uncached_alloc_page(0, 1));
566 if (amos_page
== NULL
) {
567 dev_err(xpc_part
, "can't allocate page of AMOs\n");
572 * Open up AMO-R/W to cpu. This is done on Shub 1.1 systems
573 * when xpc_allow_AMO_ops_shub_wars_1_1_sn2() is called.
575 ret
= xpc_allow_AMO_ops_sn2(amos_page
);
576 if (ret
!= xpSuccess
) {
577 dev_err(xpc_part
, "can't allow AMO operations\n");
578 uncached_free_page(__IA64_UNCACHED_OFFSET
|
579 TO_PHYS((u64
)amos_page
), 1);
585 memset(xpc_vars
, 0, sizeof(struct xpc_vars_sn2
));
587 xpc_vars
->version
= XPC_V_VERSION
;
588 xpc_vars
->activate_IRQ_nasid
= cpuid_to_nasid(0);
589 xpc_vars
->activate_IRQ_phys_cpuid
= cpu_physical_id(0);
590 xpc_vars
->vars_part_pa
= __pa(xpc_vars_part
);
591 xpc_vars
->amos_page_pa
= ia64_tpa((u64
)amos_page
);
592 xpc_vars
->amos_page
= amos_page
; /* save for next load of XPC */
594 /* clear xpc_vars_part */
595 memset((u64
*)xpc_vars_part
, 0, sizeof(struct xpc_vars_part_sn2
) *
598 /* initialize the activate IRQ related AMO variables */
599 for (i
= 0; i
< xp_nasid_mask_words
; i
++)
600 (void)xpc_init_IRQ_amo_sn2(XPC_ACTIVATE_IRQ_AMOS
+ i
);
602 /* initialize the engaged remote partitions related AMO variables */
603 (void)xpc_init_IRQ_amo_sn2(XPC_ENGAGED_PARTITIONS_AMO
);
604 (void)xpc_init_IRQ_amo_sn2(XPC_DEACTIVATE_REQUEST_AMO
);
610 xpc_increment_heartbeat_sn2(void)
612 xpc_vars
->heartbeat
++;
616 xpc_offline_heartbeat_sn2(void)
618 xpc_increment_heartbeat_sn2();
619 xpc_vars
->heartbeat_offline
= 1;
623 xpc_online_heartbeat_sn2(void)
625 xpc_increment_heartbeat_sn2();
626 xpc_vars
->heartbeat_offline
= 0;
630 xpc_heartbeat_init_sn2(void)
632 DBUG_ON(xpc_vars
== NULL
);
634 bitmap_zero(xpc_vars
->heartbeating_to_mask
, XP_MAX_NPARTITIONS_SN2
);
635 xpc_heartbeating_to_mask
= &xpc_vars
->heartbeating_to_mask
[0];
636 xpc_online_heartbeat_sn2();
640 xpc_heartbeat_exit_sn2(void)
642 xpc_offline_heartbeat_sn2();
646 * At periodic intervals, scan through all active partitions and ensure
647 * their heartbeat is still active. If not, the partition is deactivated.
650 xpc_check_remote_hb_sn2(void)
652 struct xpc_vars_sn2
*remote_vars
;
653 struct xpc_partition
*part
;
657 remote_vars
= (struct xpc_vars_sn2
*)xpc_remote_copy_buffer
;
659 for (partid
= 0; partid
< xp_max_npartitions
; partid
++) {
664 if (partid
== sn_partition_id
)
667 part
= &xpc_partitions
[partid
];
669 if (part
->act_state
== XPC_P_INACTIVE
||
670 part
->act_state
== XPC_P_DEACTIVATING
) {
674 /* pull the remote_hb cache line */
675 ret
= xp_remote_memcpy(remote_vars
,
676 (void *)part
->sn
.sn2
.remote_vars_pa
,
678 if (ret
!= xpSuccess
) {
679 XPC_DEACTIVATE_PARTITION(part
, ret
);
683 dev_dbg(xpc_part
, "partid = %d, heartbeat = %ld, last_heartbeat"
684 " = %ld, heartbeat_offline = %ld, HB_mask[0] = 0x%lx\n",
685 partid
, remote_vars
->heartbeat
, part
->last_heartbeat
,
686 remote_vars
->heartbeat_offline
,
687 remote_vars
->heartbeating_to_mask
[0]);
689 if (((remote_vars
->heartbeat
== part
->last_heartbeat
) &&
690 (remote_vars
->heartbeat_offline
== 0)) ||
691 !xpc_hb_allowed(sn_partition_id
,
692 &remote_vars
->heartbeating_to_mask
)) {
694 XPC_DEACTIVATE_PARTITION(part
, xpNoHeartbeat
);
698 part
->last_heartbeat
= remote_vars
->heartbeat
;
703 * Get a copy of the remote partition's XPC variables from the reserved page.
705 * remote_vars points to a buffer that is cacheline aligned for BTE copies and
706 * assumed to be of size XPC_RP_VARS_SIZE.
708 static enum xp_retval
709 xpc_get_remote_vars_sn2(u64 remote_vars_pa
, struct xpc_vars_sn2
*remote_vars
)
713 if (remote_vars_pa
== 0)
716 /* pull over the cross partition variables */
717 ret
= xp_remote_memcpy(remote_vars
, (void *)remote_vars_pa
,
719 if (ret
!= xpSuccess
)
722 if (XPC_VERSION_MAJOR(remote_vars
->version
) !=
723 XPC_VERSION_MAJOR(XPC_V_VERSION
)) {
731 xpc_request_partition_activation_sn2(struct xpc_rsvd_page
*remote_rp
,
732 u64 remote_rp_pa
, int nasid
)
734 xpc_send_local_activate_IRQ_sn2(nasid
);
738 xpc_request_partition_reactivation_sn2(struct xpc_partition
*part
)
740 xpc_send_local_activate_IRQ_sn2(part
->sn
.sn2
.activate_IRQ_nasid
);
744 xpc_request_partition_deactivation_sn2(struct xpc_partition
*part
)
746 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
747 unsigned long irq_flags
;
748 AMO_t
*amo
= (AMO_t
*)__va(part_sn2
->remote_amos_page_pa
+
749 (XPC_DEACTIVATE_REQUEST_AMO
* sizeof(AMO_t
)));
751 local_irq_save(irq_flags
);
753 /* set bit corresponding to our partid in remote partition's AMO */
754 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_OR
,
755 (1UL << sn_partition_id
));
757 * We must always use the nofault function regardless of whether we
758 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
759 * didn't, we'd never know that the other partition is down and would
760 * keep sending IRQs and AMOs to it until the heartbeat times out.
762 (void)xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->
764 xp_nofault_PIOR_target
));
766 local_irq_restore(irq_flags
);
769 * Send activate IRQ to get other side to see that we've set our
770 * bit in their deactivate request AMO.
772 xpc_send_activate_IRQ_sn2(part_sn2
->remote_amos_page_pa
,
774 part_sn2
->activate_IRQ_nasid
,
775 part_sn2
->activate_IRQ_phys_cpuid
);
779 xpc_cancel_partition_deactivation_request_sn2(struct xpc_partition
*part
)
781 unsigned long irq_flags
;
782 AMO_t
*amo
= (AMO_t
*)__va(part
->sn
.sn2
.remote_amos_page_pa
+
783 (XPC_DEACTIVATE_REQUEST_AMO
* sizeof(AMO_t
)));
785 local_irq_save(irq_flags
);
787 /* clear bit corresponding to our partid in remote partition's AMO */
788 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_AND
,
789 ~(1UL << sn_partition_id
));
791 * We must always use the nofault function regardless of whether we
792 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
793 * didn't, we'd never know that the other partition is down and would
794 * keep sending IRQs and AMOs to it until the heartbeat times out.
796 (void)xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->
798 xp_nofault_PIOR_target
));
800 local_irq_restore(irq_flags
);
804 xpc_partition_deactivation_requested_sn2(short partid
)
806 AMO_t
*amo
= xpc_vars
->amos_page
+ XPC_DEACTIVATE_REQUEST_AMO
;
808 /* our partition's AMO variable ANDed with partid mask */
809 return (FETCHOP_LOAD_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_LOAD
) &
810 (1UL << partid
)) != 0;
814 * Update the remote partition's info.
817 xpc_update_partition_info_sn2(struct xpc_partition
*part
, u8 remote_rp_version
,
818 unsigned long *remote_rp_stamp
, u64 remote_rp_pa
,
820 struct xpc_vars_sn2
*remote_vars
)
822 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
824 part
->remote_rp_version
= remote_rp_version
;
825 dev_dbg(xpc_part
, " remote_rp_version = 0x%016x\n",
826 part
->remote_rp_version
);
828 part
->remote_rp_stamp
= *remote_rp_stamp
;
829 dev_dbg(xpc_part
, " remote_rp_stamp = 0x%016lx\n",
830 part
->remote_rp_stamp
);
832 part
->remote_rp_pa
= remote_rp_pa
;
833 dev_dbg(xpc_part
, " remote_rp_pa = 0x%016lx\n", part
->remote_rp_pa
);
835 part_sn2
->remote_vars_pa
= remote_vars_pa
;
836 dev_dbg(xpc_part
, " remote_vars_pa = 0x%016lx\n",
837 part_sn2
->remote_vars_pa
);
839 part
->last_heartbeat
= remote_vars
->heartbeat
;
840 dev_dbg(xpc_part
, " last_heartbeat = 0x%016lx\n",
841 part
->last_heartbeat
);
843 part_sn2
->remote_vars_part_pa
= remote_vars
->vars_part_pa
;
844 dev_dbg(xpc_part
, " remote_vars_part_pa = 0x%016lx\n",
845 part_sn2
->remote_vars_part_pa
);
847 part_sn2
->activate_IRQ_nasid
= remote_vars
->activate_IRQ_nasid
;
848 dev_dbg(xpc_part
, " activate_IRQ_nasid = 0x%x\n",
849 part_sn2
->activate_IRQ_nasid
);
851 part_sn2
->activate_IRQ_phys_cpuid
=
852 remote_vars
->activate_IRQ_phys_cpuid
;
853 dev_dbg(xpc_part
, " activate_IRQ_phys_cpuid = 0x%x\n",
854 part_sn2
->activate_IRQ_phys_cpuid
);
856 part_sn2
->remote_amos_page_pa
= remote_vars
->amos_page_pa
;
857 dev_dbg(xpc_part
, " remote_amos_page_pa = 0x%lx\n",
858 part_sn2
->remote_amos_page_pa
);
860 part_sn2
->remote_vars_version
= remote_vars
->version
;
861 dev_dbg(xpc_part
, " remote_vars_version = 0x%x\n",
862 part_sn2
->remote_vars_version
);
866 * Prior code has determined the nasid which generated a activate IRQ.
867 * Inspect that nasid to determine if its partition needs to be activated
870 * A partition is considered "awaiting activation" if our partition
871 * flags indicate it is not active and it has a heartbeat. A
872 * partition is considered "awaiting deactivation" if our partition
873 * flags indicate it is active but it has no heartbeat or it is not
874 * sending its heartbeat to us.
876 * To determine the heartbeat, the remote nasid must have a properly
877 * initialized reserved page.
880 xpc_identify_activate_IRQ_req_sn2(int nasid
)
882 struct xpc_rsvd_page
*remote_rp
;
883 struct xpc_vars_sn2
*remote_vars
;
886 int remote_rp_version
;
888 unsigned long remote_rp_stamp
= 0;
890 struct xpc_partition
*part
;
891 struct xpc_partition_sn2
*part_sn2
;
894 /* pull over the reserved page structure */
896 remote_rp
= (struct xpc_rsvd_page
*)xpc_remote_copy_buffer
;
898 ret
= xpc_get_remote_rp(nasid
, NULL
, remote_rp
, &remote_rp_pa
);
899 if (ret
!= xpSuccess
) {
900 dev_warn(xpc_part
, "unable to get reserved page from nasid %d, "
901 "which sent interrupt, reason=%d\n", nasid
, ret
);
905 remote_vars_pa
= remote_rp
->sn
.vars_pa
;
906 remote_rp_version
= remote_rp
->version
;
907 remote_rp_stamp
= remote_rp
->stamp
;
909 partid
= remote_rp
->SAL_partid
;
910 part
= &xpc_partitions
[partid
];
911 part_sn2
= &part
->sn
.sn2
;
913 /* pull over the cross partition variables */
915 remote_vars
= (struct xpc_vars_sn2
*)xpc_remote_copy_buffer
;
917 ret
= xpc_get_remote_vars_sn2(remote_vars_pa
, remote_vars
);
918 if (ret
!= xpSuccess
) {
919 dev_warn(xpc_part
, "unable to get XPC variables from nasid %d, "
920 "which sent interrupt, reason=%d\n", nasid
, ret
);
922 XPC_DEACTIVATE_PARTITION(part
, ret
);
926 part
->activate_IRQ_rcvd
++;
928 dev_dbg(xpc_part
, "partid for nasid %d is %d; IRQs = %d; HB = "
929 "%ld:0x%lx\n", (int)nasid
, (int)partid
, part
->activate_IRQ_rcvd
,
930 remote_vars
->heartbeat
, remote_vars
->heartbeating_to_mask
[0]);
932 if (xpc_partition_disengaged(part
) &&
933 part
->act_state
== XPC_P_INACTIVE
) {
935 xpc_update_partition_info_sn2(part
, remote_rp_version
,
936 &remote_rp_stamp
, remote_rp_pa
,
937 remote_vars_pa
, remote_vars
);
939 if (xpc_partition_deactivation_requested_sn2(partid
)) {
941 * Other side is waiting on us to deactivate even though
947 xpc_activate_partition(part
);
951 DBUG_ON(part
->remote_rp_version
== 0);
952 DBUG_ON(part_sn2
->remote_vars_version
== 0);
954 if (remote_rp_stamp
!= part
->remote_rp_stamp
) {
956 /* the other side rebooted */
958 DBUG_ON(xpc_partition_engaged_sn2(partid
));
959 DBUG_ON(xpc_partition_deactivation_requested_sn2(partid
));
961 xpc_update_partition_info_sn2(part
, remote_rp_version
,
962 &remote_rp_stamp
, remote_rp_pa
,
963 remote_vars_pa
, remote_vars
);
967 if (part
->disengage_timeout
> 0 && !xpc_partition_disengaged(part
)) {
968 /* still waiting on other side to disengage from us */
973 XPC_DEACTIVATE_PARTITION(part
, xpReactivating
);
974 else if (xpc_partition_deactivation_requested_sn2(partid
))
975 XPC_DEACTIVATE_PARTITION(part
, xpOtherGoingDown
);
979 * Loop through the activation AMO variables and process any bits
980 * which are set. Each bit indicates a nasid sending a partition
981 * activation or deactivation request.
983 * Return #of IRQs detected.
986 xpc_identify_activate_IRQ_sender_sn2(void)
990 u64 nasid
; /* remote nasid */
991 int n_IRQs_detected
= 0;
994 act_amos
= xpc_vars
->amos_page
+ XPC_ACTIVATE_IRQ_AMOS
;
996 /* scan through act AMO variable looking for non-zero entries */
997 for (word
= 0; word
< xp_nasid_mask_words
; word
++) {
1002 nasid_mask
= xpc_receive_IRQ_amo_sn2(&act_amos
[word
]);
1003 if (nasid_mask
== 0) {
1004 /* no IRQs from nasids in this variable */
1008 dev_dbg(xpc_part
, "AMO[%d] gave back 0x%lx\n", word
,
1012 * If this nasid has been added to the machine since
1013 * our partition was reset, this will retain the
1014 * remote nasid in our reserved pages machine mask.
1015 * This is used in the event of module reload.
1017 xpc_mach_nasids
[word
] |= nasid_mask
;
1019 /* locate the nasid(s) which sent interrupts */
1021 for (bit
= 0; bit
< (8 * sizeof(u64
)); bit
++) {
1022 if (nasid_mask
& (1UL << bit
)) {
1024 nasid
= XPC_NASID_FROM_W_B(word
, bit
);
1025 dev_dbg(xpc_part
, "interrupt from nasid %ld\n",
1027 xpc_identify_activate_IRQ_req_sn2(nasid
);
1031 return n_IRQs_detected
;
1035 xpc_process_activate_IRQ_rcvd_sn2(int n_IRQs_expected
)
1037 int n_IRQs_detected
;
1039 n_IRQs_detected
= xpc_identify_activate_IRQ_sender_sn2();
1040 if (n_IRQs_detected
< n_IRQs_expected
) {
1041 /* retry once to help avoid missing AMO */
1042 (void)xpc_identify_activate_IRQ_sender_sn2();
1047 * Setup the infrastructure necessary to support XPartition Communication
1048 * between the specified remote partition and the local one.
1050 static enum xp_retval
1051 xpc_setup_infrastructure_sn2(struct xpc_partition
*part
)
1053 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1054 enum xp_retval retval
;
1058 struct xpc_channel
*ch
;
1059 struct timer_list
*timer
;
1060 short partid
= XPC_PARTID(part
);
1063 * Allocate all of the channel structures as a contiguous chunk of
1066 DBUG_ON(part
->channels
!= NULL
);
1067 part
->channels
= kzalloc(sizeof(struct xpc_channel
) * XPC_MAX_NCHANNELS
,
1069 if (part
->channels
== NULL
) {
1070 dev_err(xpc_chan
, "can't get memory for channels\n");
1074 /* allocate all the required GET/PUT values */
1076 part_sn2
->local_GPs
= xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE
,
1080 if (part_sn2
->local_GPs
== NULL
) {
1081 dev_err(xpc_chan
, "can't get memory for local get/put "
1083 retval
= xpNoMemory
;
1087 part_sn2
->remote_GPs
= xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE
,
1091 if (part_sn2
->remote_GPs
== NULL
) {
1092 dev_err(xpc_chan
, "can't get memory for remote get/put "
1094 retval
= xpNoMemory
;
1098 part_sn2
->remote_GPs_pa
= 0;
1100 /* allocate all the required open and close args */
1102 part
->local_openclose_args
=
1103 xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE
, GFP_KERNEL
,
1104 &part
->local_openclose_args_base
);
1105 if (part
->local_openclose_args
== NULL
) {
1106 dev_err(xpc_chan
, "can't get memory for local connect args\n");
1107 retval
= xpNoMemory
;
1111 part
->remote_openclose_args
=
1112 xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE
, GFP_KERNEL
,
1113 &part
->remote_openclose_args_base
);
1114 if (part
->remote_openclose_args
== NULL
) {
1115 dev_err(xpc_chan
, "can't get memory for remote connect args\n");
1116 retval
= xpNoMemory
;
1120 part_sn2
->remote_openclose_args_pa
= 0;
1122 part_sn2
->local_chctl_amo_va
= xpc_init_IRQ_amo_sn2(partid
);
1123 part
->chctl
.all_flags
= 0;
1124 spin_lock_init(&part
->chctl_lock
);
1126 part_sn2
->notify_IRQ_nasid
= 0;
1127 part_sn2
->notify_IRQ_phys_cpuid
= 0;
1128 part_sn2
->remote_chctl_amo_va
= NULL
;
1130 atomic_set(&part
->channel_mgr_requests
, 1);
1131 init_waitqueue_head(&part
->channel_mgr_wq
);
1133 sprintf(part_sn2
->notify_IRQ_owner
, "xpc%02d", partid
);
1134 ret
= request_irq(SGI_XPC_NOTIFY
, xpc_handle_notify_IRQ_sn2
,
1135 IRQF_SHARED
, part_sn2
->notify_IRQ_owner
,
1136 (void *)(u64
)partid
);
1138 dev_err(xpc_chan
, "can't register NOTIFY IRQ handler, "
1139 "errno=%d\n", -ret
);
1140 retval
= xpLackOfResources
;
1144 /* Setup a timer to check for dropped notify IRQs */
1145 timer
= &part_sn2
->dropped_notify_IRQ_timer
;
1148 (void (*)(unsigned long))xpc_check_for_dropped_notify_IRQ_sn2
;
1149 timer
->data
= (unsigned long)part
;
1150 timer
->expires
= jiffies
+ XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL
;
1153 part
->nchannels
= XPC_MAX_NCHANNELS
;
1155 atomic_set(&part
->nchannels_active
, 0);
1156 atomic_set(&part
->nchannels_engaged
, 0);
1158 for (ch_number
= 0; ch_number
< part
->nchannels
; ch_number
++) {
1159 ch
= &part
->channels
[ch_number
];
1161 ch
->partid
= partid
;
1162 ch
->number
= ch_number
;
1163 ch
->flags
= XPC_C_DISCONNECTED
;
1165 ch
->sn
.sn2
.local_GP
= &part_sn2
->local_GPs
[ch_number
];
1166 ch
->local_openclose_args
=
1167 &part
->local_openclose_args
[ch_number
];
1169 atomic_set(&ch
->kthreads_assigned
, 0);
1170 atomic_set(&ch
->kthreads_idle
, 0);
1171 atomic_set(&ch
->kthreads_active
, 0);
1173 atomic_set(&ch
->references
, 0);
1174 atomic_set(&ch
->n_to_notify
, 0);
1176 spin_lock_init(&ch
->lock
);
1177 mutex_init(&ch
->sn
.sn2
.msg_to_pull_mutex
);
1178 init_completion(&ch
->wdisconnect_wait
);
1180 atomic_set(&ch
->n_on_msg_allocate_wq
, 0);
1181 init_waitqueue_head(&ch
->msg_allocate_wq
);
1182 init_waitqueue_head(&ch
->idle_wq
);
1186 * With the setting of the partition setup_state to XPC_P_SETUP, we're
1187 * declaring that this partition is ready to go.
1189 part
->setup_state
= XPC_P_SETUP
;
1192 * Setup the per partition specific variables required by the
1193 * remote partition to establish channel connections with us.
1195 * The setting of the magic # indicates that these per partition
1196 * specific variables are ready to be used.
1198 xpc_vars_part
[partid
].GPs_pa
= __pa(part_sn2
->local_GPs
);
1199 xpc_vars_part
[partid
].openclose_args_pa
=
1200 __pa(part
->local_openclose_args
);
1201 xpc_vars_part
[partid
].chctl_amo_pa
= __pa(part_sn2
->local_chctl_amo_va
);
1202 cpuid
= raw_smp_processor_id(); /* any CPU in this partition will do */
1203 xpc_vars_part
[partid
].notify_IRQ_nasid
= cpuid_to_nasid(cpuid
);
1204 xpc_vars_part
[partid
].notify_IRQ_phys_cpuid
= cpu_physical_id(cpuid
);
1205 xpc_vars_part
[partid
].nchannels
= part
->nchannels
;
1206 xpc_vars_part
[partid
].magic
= XPC_VP_MAGIC1
;
1210 /* setup of infrastructure failed */
1212 kfree(part
->remote_openclose_args_base
);
1213 part
->remote_openclose_args
= NULL
;
1215 kfree(part
->local_openclose_args_base
);
1216 part
->local_openclose_args
= NULL
;
1218 kfree(part_sn2
->remote_GPs_base
);
1219 part_sn2
->remote_GPs
= NULL
;
1221 kfree(part_sn2
->local_GPs_base
);
1222 part_sn2
->local_GPs
= NULL
;
1224 kfree(part
->channels
);
1225 part
->channels
= NULL
;
1230 * Teardown the infrastructure necessary to support XPartition Communication
1231 * between the specified remote partition and the local one.
1234 xpc_teardown_infrastructure_sn2(struct xpc_partition
*part
)
1236 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1237 short partid
= XPC_PARTID(part
);
1240 * We start off by making this partition inaccessible to local
1241 * processes by marking it as no longer setup. Then we make it
1242 * inaccessible to remote processes by clearing the XPC per partition
1243 * specific variable's magic # (which indicates that these variables
1244 * are no longer valid) and by ignoring all XPC notify IRQs sent to
1248 DBUG_ON(atomic_read(&part
->nchannels_engaged
) != 0);
1249 DBUG_ON(atomic_read(&part
->nchannels_active
) != 0);
1250 DBUG_ON(part
->setup_state
!= XPC_P_SETUP
);
1251 part
->setup_state
= XPC_P_WTEARDOWN
;
1253 xpc_vars_part
[partid
].magic
= 0;
1255 free_irq(SGI_XPC_NOTIFY
, (void *)(u64
)partid
);
1258 * Before proceeding with the teardown we have to wait until all
1259 * existing references cease.
1261 wait_event(part
->teardown_wq
, (atomic_read(&part
->references
) == 0));
1263 /* now we can begin tearing down the infrastructure */
1265 part
->setup_state
= XPC_P_TORNDOWN
;
1267 /* in case we've still got outstanding timers registered... */
1268 del_timer_sync(&part_sn2
->dropped_notify_IRQ_timer
);
1270 kfree(part
->remote_openclose_args_base
);
1271 part
->remote_openclose_args
= NULL
;
1272 kfree(part
->local_openclose_args_base
);
1273 part
->local_openclose_args
= NULL
;
1274 kfree(part_sn2
->remote_GPs_base
);
1275 part_sn2
->remote_GPs
= NULL
;
1276 kfree(part_sn2
->local_GPs_base
);
1277 part_sn2
->local_GPs
= NULL
;
1278 kfree(part
->channels
);
1279 part
->channels
= NULL
;
1280 part_sn2
->local_chctl_amo_va
= NULL
;
1284 * Create a wrapper that hides the underlying mechanism for pulling a cacheline
1285 * (or multiple cachelines) from a remote partition.
1287 * src must be a cacheline aligned physical address on the remote partition.
1288 * dst must be a cacheline aligned virtual address on this partition.
1289 * cnt must be cacheline sized
1291 /* >>> Replace this function by call to xp_remote_memcpy() or bte_copy()? */
1292 static enum xp_retval
1293 xpc_pull_remote_cachelines_sn2(struct xpc_partition
*part
, void *dst
,
1294 const void *src
, size_t cnt
)
1298 DBUG_ON((u64
)src
!= L1_CACHE_ALIGN((u64
)src
));
1299 DBUG_ON((u64
)dst
!= L1_CACHE_ALIGN((u64
)dst
));
1300 DBUG_ON(cnt
!= L1_CACHE_ALIGN(cnt
));
1302 if (part
->act_state
== XPC_P_DEACTIVATING
)
1303 return part
->reason
;
1305 ret
= xp_remote_memcpy(dst
, src
, cnt
);
1306 if (ret
!= xpSuccess
) {
1307 dev_dbg(xpc_chan
, "xp_remote_memcpy() from partition %d failed,"
1308 " ret=%d\n", XPC_PARTID(part
), ret
);
1314 * Pull the remote per partition specific variables from the specified
1317 static enum xp_retval
1318 xpc_pull_remote_vars_part_sn2(struct xpc_partition
*part
)
1320 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1321 u8 buffer
[L1_CACHE_BYTES
* 2];
1322 struct xpc_vars_part_sn2
*pulled_entry_cacheline
=
1323 (struct xpc_vars_part_sn2
*)L1_CACHE_ALIGN((u64
)buffer
);
1324 struct xpc_vars_part_sn2
*pulled_entry
;
1325 u64 remote_entry_cacheline_pa
, remote_entry_pa
;
1326 short partid
= XPC_PARTID(part
);
1329 /* pull the cacheline that contains the variables we're interested in */
1331 DBUG_ON(part_sn2
->remote_vars_part_pa
!=
1332 L1_CACHE_ALIGN(part_sn2
->remote_vars_part_pa
));
1333 DBUG_ON(sizeof(struct xpc_vars_part_sn2
) != L1_CACHE_BYTES
/ 2);
1335 remote_entry_pa
= part_sn2
->remote_vars_part_pa
+
1336 sn_partition_id
* sizeof(struct xpc_vars_part_sn2
);
1338 remote_entry_cacheline_pa
= (remote_entry_pa
& ~(L1_CACHE_BYTES
- 1));
1340 pulled_entry
= (struct xpc_vars_part_sn2
*)((u64
)pulled_entry_cacheline
1341 + (remote_entry_pa
&
1342 (L1_CACHE_BYTES
- 1)));
1344 ret
= xpc_pull_remote_cachelines_sn2(part
, pulled_entry_cacheline
,
1345 (void *)remote_entry_cacheline_pa
,
1347 if (ret
!= xpSuccess
) {
1348 dev_dbg(xpc_chan
, "failed to pull XPC vars_part from "
1349 "partition %d, ret=%d\n", partid
, ret
);
1353 /* see if they've been set up yet */
1355 if (pulled_entry
->magic
!= XPC_VP_MAGIC1
&&
1356 pulled_entry
->magic
!= XPC_VP_MAGIC2
) {
1358 if (pulled_entry
->magic
!= 0) {
1359 dev_dbg(xpc_chan
, "partition %d's XPC vars_part for "
1360 "partition %d has bad magic value (=0x%lx)\n",
1361 partid
, sn_partition_id
, pulled_entry
->magic
);
1365 /* they've not been initialized yet */
1369 if (xpc_vars_part
[partid
].magic
== XPC_VP_MAGIC1
) {
1371 /* validate the variables */
1373 if (pulled_entry
->GPs_pa
== 0 ||
1374 pulled_entry
->openclose_args_pa
== 0 ||
1375 pulled_entry
->chctl_amo_pa
== 0) {
1377 dev_err(xpc_chan
, "partition %d's XPC vars_part for "
1378 "partition %d are not valid\n", partid
,
1380 return xpInvalidAddress
;
1383 /* the variables we imported look to be valid */
1385 part_sn2
->remote_GPs_pa
= pulled_entry
->GPs_pa
;
1386 part_sn2
->remote_openclose_args_pa
=
1387 pulled_entry
->openclose_args_pa
;
1388 part_sn2
->remote_chctl_amo_va
=
1389 (AMO_t
*)__va(pulled_entry
->chctl_amo_pa
);
1390 part_sn2
->notify_IRQ_nasid
= pulled_entry
->notify_IRQ_nasid
;
1391 part_sn2
->notify_IRQ_phys_cpuid
=
1392 pulled_entry
->notify_IRQ_phys_cpuid
;
1394 if (part
->nchannels
> pulled_entry
->nchannels
)
1395 part
->nchannels
= pulled_entry
->nchannels
;
1397 /* let the other side know that we've pulled their variables */
1399 xpc_vars_part
[partid
].magic
= XPC_VP_MAGIC2
;
1402 if (pulled_entry
->magic
== XPC_VP_MAGIC1
)
1409 * Establish first contact with the remote partititon. This involves pulling
1410 * the XPC per partition variables from the remote partition and waiting for
1411 * the remote partition to pull ours.
1413 static enum xp_retval
1414 xpc_make_first_contact_sn2(struct xpc_partition
*part
)
1416 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1420 * Register the remote partition's AMOs with SAL so it can handle
1421 * and cleanup errors within that address range should the remote
1422 * partition go down. We don't unregister this range because it is
1423 * difficult to tell when outstanding writes to the remote partition
1424 * are finished and thus when it is safe to unregister. This should
1425 * not result in wasted space in the SAL xp_addr_region table because
1426 * we should get the same page for remote_amos_page_pa after module
1427 * reloads and system reboots.
1429 if (sn_register_xp_addr_region(part_sn2
->remote_amos_page_pa
,
1430 PAGE_SIZE
, 1) < 0) {
1431 dev_warn(xpc_part
, "xpc_activating(%d) failed to register "
1432 "xp_addr region\n", XPC_PARTID(part
));
1434 ret
= xpPhysAddrRegFailed
;
1435 XPC_DEACTIVATE_PARTITION(part
, ret
);
1440 * Send activate IRQ to get other side to activate if they've not
1441 * already begun to do so.
1443 xpc_send_activate_IRQ_sn2(part_sn2
->remote_amos_page_pa
,
1444 cnodeid_to_nasid(0),
1445 part_sn2
->activate_IRQ_nasid
,
1446 part_sn2
->activate_IRQ_phys_cpuid
);
1448 while ((ret
= xpc_pull_remote_vars_part_sn2(part
)) != xpSuccess
) {
1449 if (ret
!= xpRetry
) {
1450 XPC_DEACTIVATE_PARTITION(part
, ret
);
1454 dev_dbg(xpc_part
, "waiting to make first contact with "
1455 "partition %d\n", XPC_PARTID(part
));
1457 /* wait a 1/4 of a second or so */
1458 (void)msleep_interruptible(250);
1460 if (part
->act_state
== XPC_P_DEACTIVATING
)
1461 return part
->reason
;
1468 * Get the chctl flags and pull the openclose args and/or remote GPs as needed.
1471 xpc_get_chctl_all_flags_sn2(struct xpc_partition
*part
)
1473 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1474 unsigned long irq_flags
;
1475 union xpc_channel_ctl_flags chctl
;
1479 * See if there are any chctl flags to be handled.
1482 spin_lock_irqsave(&part
->chctl_lock
, irq_flags
);
1483 chctl
= part
->chctl
;
1484 if (chctl
.all_flags
!= 0)
1485 part
->chctl
.all_flags
= 0;
1487 spin_unlock_irqrestore(&part
->chctl_lock
, irq_flags
);
1489 if (xpc_any_openclose_chctl_flags_set(&chctl
)) {
1490 ret
= xpc_pull_remote_cachelines_sn2(part
, part
->
1491 remote_openclose_args
,
1493 remote_openclose_args_pa
,
1494 XPC_OPENCLOSE_ARGS_SIZE
);
1495 if (ret
!= xpSuccess
) {
1496 XPC_DEACTIVATE_PARTITION(part
, ret
);
1498 dev_dbg(xpc_chan
, "failed to pull openclose args from "
1499 "partition %d, ret=%d\n", XPC_PARTID(part
),
1502 /* don't bother processing chctl flags anymore */
1503 chctl
.all_flags
= 0;
1507 if (xpc_any_msg_chctl_flags_set(&chctl
)) {
1508 ret
= xpc_pull_remote_cachelines_sn2(part
, part_sn2
->remote_GPs
,
1509 (void *)part_sn2
->remote_GPs_pa
,
1511 if (ret
!= xpSuccess
) {
1512 XPC_DEACTIVATE_PARTITION(part
, ret
);
1514 dev_dbg(xpc_chan
, "failed to pull GPs from partition "
1515 "%d, ret=%d\n", XPC_PARTID(part
), ret
);
1517 /* don't bother processing chctl flags anymore */
1518 chctl
.all_flags
= 0;
1522 return chctl
.all_flags
;
1526 * Notify those who wanted to be notified upon delivery of their message.
1529 xpc_notify_senders_sn2(struct xpc_channel
*ch
, enum xp_retval reason
, s64 put
)
1531 struct xpc_notify
*notify
;
1533 s64 get
= ch
->sn
.sn2
.w_remote_GP
.get
- 1;
1535 while (++get
< put
&& atomic_read(&ch
->n_to_notify
) > 0) {
1537 notify
= &ch
->notify_queue
[get
% ch
->local_nentries
];
1540 * See if the notify entry indicates it was associated with
1541 * a message who's sender wants to be notified. It is possible
1542 * that it is, but someone else is doing or has done the
1545 notify_type
= notify
->type
;
1546 if (notify_type
== 0 ||
1547 cmpxchg(¬ify
->type
, notify_type
, 0) != notify_type
) {
1551 DBUG_ON(notify_type
!= XPC_N_CALL
);
1553 atomic_dec(&ch
->n_to_notify
);
1555 if (notify
->func
!= NULL
) {
1556 dev_dbg(xpc_chan
, "notify->func() called, notify=0x%p, "
1557 "msg_number=%ld, partid=%d, channel=%d\n",
1558 (void *)notify
, get
, ch
->partid
, ch
->number
);
1560 notify
->func(reason
, ch
->partid
, ch
->number
,
1563 dev_dbg(xpc_chan
, "notify->func() returned, "
1564 "notify=0x%p, msg_number=%ld, partid=%d, "
1565 "channel=%d\n", (void *)notify
, get
,
1566 ch
->partid
, ch
->number
);
1572 xpc_notify_senders_of_disconnect_sn2(struct xpc_channel
*ch
)
1574 xpc_notify_senders_sn2(ch
, ch
->reason
, ch
->sn
.sn2
.w_local_GP
.put
);
1578 * Clear some of the msg flags in the local message queue.
1581 xpc_clear_local_msgqueue_flags_sn2(struct xpc_channel
*ch
)
1583 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1584 struct xpc_msg
*msg
;
1587 get
= ch_sn2
->w_remote_GP
.get
;
1589 msg
= (struct xpc_msg
*)((u64
)ch
->local_msgqueue
+
1590 (get
% ch
->local_nentries
) *
1593 } while (++get
< ch_sn2
->remote_GP
.get
);
1597 * Clear some of the msg flags in the remote message queue.
1600 xpc_clear_remote_msgqueue_flags_sn2(struct xpc_channel
*ch
)
1602 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1603 struct xpc_msg
*msg
;
1606 put
= ch_sn2
->w_remote_GP
.put
;
1608 msg
= (struct xpc_msg
*)((u64
)ch
->remote_msgqueue
+
1609 (put
% ch
->remote_nentries
) *
1612 } while (++put
< ch_sn2
->remote_GP
.put
);
1616 xpc_process_msg_chctl_flags_sn2(struct xpc_partition
*part
, int ch_number
)
1618 struct xpc_channel
*ch
= &part
->channels
[ch_number
];
1619 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1622 ch_sn2
->remote_GP
= part
->sn
.sn2
.remote_GPs
[ch_number
];
1624 /* See what, if anything, has changed for each connected channel */
1626 xpc_msgqueue_ref(ch
);
1628 if (ch_sn2
->w_remote_GP
.get
== ch_sn2
->remote_GP
.get
&&
1629 ch_sn2
->w_remote_GP
.put
== ch_sn2
->remote_GP
.put
) {
1630 /* nothing changed since GPs were last pulled */
1631 xpc_msgqueue_deref(ch
);
1635 if (!(ch
->flags
& XPC_C_CONNECTED
)) {
1636 xpc_msgqueue_deref(ch
);
1641 * First check to see if messages recently sent by us have been
1642 * received by the other side. (The remote GET value will have
1643 * changed since we last looked at it.)
1646 if (ch_sn2
->w_remote_GP
.get
!= ch_sn2
->remote_GP
.get
) {
1649 * We need to notify any senders that want to be notified
1650 * that their sent messages have been received by their
1651 * intended recipients. We need to do this before updating
1652 * w_remote_GP.get so that we don't allocate the same message
1653 * queue entries prematurely (see xpc_allocate_msg()).
1655 if (atomic_read(&ch
->n_to_notify
) > 0) {
1657 * Notify senders that messages sent have been
1658 * received and delivered by the other side.
1660 xpc_notify_senders_sn2(ch
, xpMsgDelivered
,
1661 ch_sn2
->remote_GP
.get
);
1665 * Clear msg->flags in previously sent messages, so that
1666 * they're ready for xpc_allocate_msg().
1668 xpc_clear_local_msgqueue_flags_sn2(ch
);
1670 ch_sn2
->w_remote_GP
.get
= ch_sn2
->remote_GP
.get
;
1672 dev_dbg(xpc_chan
, "w_remote_GP.get changed to %ld, partid=%d, "
1673 "channel=%d\n", ch_sn2
->w_remote_GP
.get
, ch
->partid
,
1677 * If anyone was waiting for message queue entries to become
1678 * available, wake them up.
1680 if (atomic_read(&ch
->n_on_msg_allocate_wq
) > 0)
1681 wake_up(&ch
->msg_allocate_wq
);
1685 * Now check for newly sent messages by the other side. (The remote
1686 * PUT value will have changed since we last looked at it.)
1689 if (ch_sn2
->w_remote_GP
.put
!= ch_sn2
->remote_GP
.put
) {
1691 * Clear msg->flags in previously received messages, so that
1692 * they're ready for xpc_get_deliverable_msg().
1694 xpc_clear_remote_msgqueue_flags_sn2(ch
);
1696 ch_sn2
->w_remote_GP
.put
= ch_sn2
->remote_GP
.put
;
1698 dev_dbg(xpc_chan
, "w_remote_GP.put changed to %ld, partid=%d, "
1699 "channel=%d\n", ch_sn2
->w_remote_GP
.put
, ch
->partid
,
1702 nmsgs_sent
= ch_sn2
->w_remote_GP
.put
- ch_sn2
->w_local_GP
.get
;
1703 if (nmsgs_sent
> 0) {
1704 dev_dbg(xpc_chan
, "msgs waiting to be copied and "
1705 "delivered=%d, partid=%d, channel=%d\n",
1706 nmsgs_sent
, ch
->partid
, ch
->number
);
1708 if (ch
->flags
& XPC_C_CONNECTEDCALLOUT_MADE
)
1709 xpc_activate_kthreads(ch
, nmsgs_sent
);
1713 xpc_msgqueue_deref(ch
);
1716 static struct xpc_msg
*
1717 xpc_pull_remote_msg_sn2(struct xpc_channel
*ch
, s64 get
)
1719 struct xpc_partition
*part
= &xpc_partitions
[ch
->partid
];
1720 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1721 struct xpc_msg
*remote_msg
, *msg
;
1722 u32 msg_index
, nmsgs
;
1726 if (mutex_lock_interruptible(&ch_sn2
->msg_to_pull_mutex
) != 0) {
1727 /* we were interrupted by a signal */
1731 while (get
>= ch_sn2
->next_msg_to_pull
) {
1733 /* pull as many messages as are ready and able to be pulled */
1735 msg_index
= ch_sn2
->next_msg_to_pull
% ch
->remote_nentries
;
1737 DBUG_ON(ch_sn2
->next_msg_to_pull
>= ch_sn2
->w_remote_GP
.put
);
1738 nmsgs
= ch_sn2
->w_remote_GP
.put
- ch_sn2
->next_msg_to_pull
;
1739 if (msg_index
+ nmsgs
> ch
->remote_nentries
) {
1740 /* ignore the ones that wrap the msg queue for now */
1741 nmsgs
= ch
->remote_nentries
- msg_index
;
1744 msg_offset
= msg_index
* ch
->msg_size
;
1745 msg
= (struct xpc_msg
*)((u64
)ch
->remote_msgqueue
+ msg_offset
);
1746 remote_msg
= (struct xpc_msg
*)(ch
->remote_msgqueue_pa
+
1749 ret
= xpc_pull_remote_cachelines_sn2(part
, msg
, remote_msg
,
1750 nmsgs
* ch
->msg_size
);
1751 if (ret
!= xpSuccess
) {
1753 dev_dbg(xpc_chan
, "failed to pull %d msgs starting with"
1754 " msg %ld from partition %d, channel=%d, "
1755 "ret=%d\n", nmsgs
, ch_sn2
->next_msg_to_pull
,
1756 ch
->partid
, ch
->number
, ret
);
1758 XPC_DEACTIVATE_PARTITION(part
, ret
);
1760 mutex_unlock(&ch_sn2
->msg_to_pull_mutex
);
1764 ch_sn2
->next_msg_to_pull
+= nmsgs
;
1767 mutex_unlock(&ch_sn2
->msg_to_pull_mutex
);
1769 /* return the message we were looking for */
1770 msg_offset
= (get
% ch
->remote_nentries
) * ch
->msg_size
;
1771 msg
= (struct xpc_msg
*)((u64
)ch
->remote_msgqueue
+ msg_offset
);
1777 xpc_n_of_deliverable_msgs_sn2(struct xpc_channel
*ch
)
1779 return ch
->sn
.sn2
.w_remote_GP
.put
- ch
->sn
.sn2
.w_local_GP
.get
;
1783 * Get a message to be delivered.
1785 static struct xpc_msg
*
1786 xpc_get_deliverable_msg_sn2(struct xpc_channel
*ch
)
1788 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1789 struct xpc_msg
*msg
= NULL
;
1793 if (ch
->flags
& XPC_C_DISCONNECTING
)
1796 get
= ch_sn2
->w_local_GP
.get
;
1797 rmb(); /* guarantee that .get loads before .put */
1798 if (get
== ch_sn2
->w_remote_GP
.put
)
1801 /* There are messages waiting to be pulled and delivered.
1802 * We need to try to secure one for ourselves. We'll do this
1803 * by trying to increment w_local_GP.get and hope that no one
1804 * else beats us to it. If they do, we'll we'll simply have
1805 * to try again for the next one.
1808 if (cmpxchg(&ch_sn2
->w_local_GP
.get
, get
, get
+ 1) == get
) {
1809 /* we got the entry referenced by get */
1811 dev_dbg(xpc_chan
, "w_local_GP.get changed to %ld, "
1812 "partid=%d, channel=%d\n", get
+ 1,
1813 ch
->partid
, ch
->number
);
1815 /* pull the message from the remote partition */
1817 msg
= xpc_pull_remote_msg_sn2(ch
, get
);
1819 DBUG_ON(msg
!= NULL
&& msg
->number
!= get
);
1820 DBUG_ON(msg
!= NULL
&& (msg
->flags
& XPC_M_DONE
));
1821 DBUG_ON(msg
!= NULL
&& !(msg
->flags
& XPC_M_READY
));
1832 * Now we actually send the messages that are ready to be sent by advancing
1833 * the local message queue's Put value and then send a chctl msgrequest to the
1834 * recipient partition.
1837 xpc_send_msgs_sn2(struct xpc_channel
*ch
, s64 initial_put
)
1839 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1840 struct xpc_msg
*msg
;
1841 s64 put
= initial_put
+ 1;
1842 int send_msgrequest
= 0;
1847 if (put
== ch_sn2
->w_local_GP
.put
)
1850 msg
= (struct xpc_msg
*)((u64
)ch
->local_msgqueue
+
1851 (put
% ch
->local_nentries
) *
1854 if (!(msg
->flags
& XPC_M_READY
))
1860 if (put
== initial_put
) {
1861 /* nothing's changed */
1865 if (cmpxchg_rel(&ch_sn2
->local_GP
->put
, initial_put
, put
) !=
1867 /* someone else beat us to it */
1868 DBUG_ON(ch_sn2
->local_GP
->put
< initial_put
);
1872 /* we just set the new value of local_GP->put */
1874 dev_dbg(xpc_chan
, "local_GP->put changed to %ld, partid=%d, "
1875 "channel=%d\n", put
, ch
->partid
, ch
->number
);
1877 send_msgrequest
= 1;
1880 * We need to ensure that the message referenced by
1881 * local_GP->put is not XPC_M_READY or that local_GP->put
1882 * equals w_local_GP.put, so we'll go have a look.
1887 if (send_msgrequest
)
1888 xpc_send_chctl_msgrequest_sn2(ch
);
1892 * Allocate an entry for a message from the message queue associated with the
1893 * specified channel.
1895 static enum xp_retval
1896 xpc_allocate_msg_sn2(struct xpc_channel
*ch
, u32 flags
,
1897 struct xpc_msg
**address_of_msg
)
1899 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1900 struct xpc_msg
*msg
;
1905 * Get the next available message entry from the local message queue.
1906 * If none are available, we'll make sure that we grab the latest
1913 put
= ch_sn2
->w_local_GP
.put
;
1914 rmb(); /* guarantee that .put loads before .get */
1915 if (put
- ch_sn2
->w_remote_GP
.get
< ch
->local_nentries
) {
1917 /* There are available message entries. We need to try
1918 * to secure one for ourselves. We'll do this by trying
1919 * to increment w_local_GP.put as long as someone else
1920 * doesn't beat us to it. If they do, we'll have to
1923 if (cmpxchg(&ch_sn2
->w_local_GP
.put
, put
, put
+ 1) ==
1925 /* we got the entry referenced by put */
1928 continue; /* try again */
1932 * There aren't any available msg entries at this time.
1934 * In waiting for a message entry to become available,
1935 * we set a timeout in case the other side is not sending
1936 * completion interrupts. This lets us fake a notify IRQ
1937 * that will cause the notify IRQ handler to fetch the latest
1938 * GP values as if an interrupt was sent by the other side.
1940 if (ret
== xpTimeout
)
1941 xpc_send_chctl_local_msgrequest_sn2(ch
);
1943 if (flags
& XPC_NOWAIT
)
1946 ret
= xpc_allocate_msg_wait(ch
);
1947 if (ret
!= xpInterrupted
&& ret
!= xpTimeout
)
1951 /* get the message's address and initialize it */
1952 msg
= (struct xpc_msg
*)((u64
)ch
->local_msgqueue
+
1953 (put
% ch
->local_nentries
) * ch
->msg_size
);
1955 DBUG_ON(msg
->flags
!= 0);
1958 dev_dbg(xpc_chan
, "w_local_GP.put changed to %ld; msg=0x%p, "
1959 "msg_number=%ld, partid=%d, channel=%d\n", put
+ 1,
1960 (void *)msg
, msg
->number
, ch
->partid
, ch
->number
);
1962 *address_of_msg
= msg
;
1967 * Common code that does the actual sending of the message by advancing the
1968 * local message queue's Put value and sends a chctl msgrequest to the
1969 * partition the message is being sent to.
1971 static enum xp_retval
1972 xpc_send_msg_sn2(struct xpc_channel
*ch
, u32 flags
, void *payload
,
1973 u16 payload_size
, u8 notify_type
, xpc_notify_func func
,
1976 enum xp_retval ret
= xpSuccess
;
1977 struct xpc_msg
*msg
= msg
;
1978 struct xpc_notify
*notify
= notify
;
1982 DBUG_ON(notify_type
== XPC_N_CALL
&& func
== NULL
);
1984 if (XPC_MSG_SIZE(payload_size
) > ch
->msg_size
)
1985 return xpPayloadTooBig
;
1987 xpc_msgqueue_ref(ch
);
1989 if (ch
->flags
& XPC_C_DISCONNECTING
) {
1993 if (!(ch
->flags
& XPC_C_CONNECTED
)) {
1994 ret
= xpNotConnected
;
1998 ret
= xpc_allocate_msg_sn2(ch
, flags
, &msg
);
1999 if (ret
!= xpSuccess
)
2002 msg_number
= msg
->number
;
2004 if (notify_type
!= 0) {
2006 * Tell the remote side to send an ACK interrupt when the
2007 * message has been delivered.
2009 msg
->flags
|= XPC_M_INTERRUPT
;
2011 atomic_inc(&ch
->n_to_notify
);
2013 notify
= &ch
->notify_queue
[msg_number
% ch
->local_nentries
];
2014 notify
->func
= func
;
2016 notify
->type
= notify_type
;
2018 /* >>> is a mb() needed here? */
2020 if (ch
->flags
& XPC_C_DISCONNECTING
) {
2022 * An error occurred between our last error check and
2023 * this one. We will try to clear the type field from
2024 * the notify entry. If we succeed then
2025 * xpc_disconnect_channel() didn't already process
2028 if (cmpxchg(¬ify
->type
, notify_type
, 0) ==
2030 atomic_dec(&ch
->n_to_notify
);
2037 memcpy(&msg
->payload
, payload
, payload_size
);
2039 msg
->flags
|= XPC_M_READY
;
2042 * The preceding store of msg->flags must occur before the following
2043 * load of local_GP->put.
2047 /* see if the message is next in line to be sent, if so send it */
2049 put
= ch
->sn
.sn2
.local_GP
->put
;
2050 if (put
== msg_number
)
2051 xpc_send_msgs_sn2(ch
, put
);
2054 xpc_msgqueue_deref(ch
);
2059 * Now we actually acknowledge the messages that have been delivered and ack'd
2060 * by advancing the cached remote message queue's Get value and if requested
2061 * send a chctl msgrequest to the message sender's partition.
2064 xpc_acknowledge_msgs_sn2(struct xpc_channel
*ch
, s64 initial_get
, u8 msg_flags
)
2066 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
2067 struct xpc_msg
*msg
;
2068 s64 get
= initial_get
+ 1;
2069 int send_msgrequest
= 0;
2074 if (get
== ch_sn2
->w_local_GP
.get
)
2077 msg
= (struct xpc_msg
*)((u64
)ch
->remote_msgqueue
+
2078 (get
% ch
->remote_nentries
) *
2081 if (!(msg
->flags
& XPC_M_DONE
))
2084 msg_flags
|= msg
->flags
;
2088 if (get
== initial_get
) {
2089 /* nothing's changed */
2093 if (cmpxchg_rel(&ch_sn2
->local_GP
->get
, initial_get
, get
) !=
2095 /* someone else beat us to it */
2096 DBUG_ON(ch_sn2
->local_GP
->get
<= initial_get
);
2100 /* we just set the new value of local_GP->get */
2102 dev_dbg(xpc_chan
, "local_GP->get changed to %ld, partid=%d, "
2103 "channel=%d\n", get
, ch
->partid
, ch
->number
);
2105 send_msgrequest
= (msg_flags
& XPC_M_INTERRUPT
);
2108 * We need to ensure that the message referenced by
2109 * local_GP->get is not XPC_M_DONE or that local_GP->get
2110 * equals w_local_GP.get, so we'll go have a look.
2115 if (send_msgrequest
)
2116 xpc_send_chctl_msgrequest_sn2(ch
);
2120 xpc_received_msg_sn2(struct xpc_channel
*ch
, struct xpc_msg
*msg
)
2123 s64 msg_number
= msg
->number
;
2125 dev_dbg(xpc_chan
, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n",
2126 (void *)msg
, msg_number
, ch
->partid
, ch
->number
);
2128 DBUG_ON((((u64
)msg
- (u64
)ch
->remote_msgqueue
) / ch
->msg_size
) !=
2129 msg_number
% ch
->remote_nentries
);
2130 DBUG_ON(msg
->flags
& XPC_M_DONE
);
2132 msg
->flags
|= XPC_M_DONE
;
2135 * The preceding store of msg->flags must occur before the following
2136 * load of local_GP->get.
2141 * See if this message is next in line to be acknowledged as having
2144 get
= ch
->sn
.sn2
.local_GP
->get
;
2145 if (get
== msg_number
)
2146 xpc_acknowledge_msgs_sn2(ch
, get
, msg
->flags
);
2154 xpc_rsvd_page_init
= xpc_rsvd_page_init_sn2
;
2155 xpc_increment_heartbeat
= xpc_increment_heartbeat_sn2
;
2156 xpc_offline_heartbeat
= xpc_offline_heartbeat_sn2
;
2157 xpc_online_heartbeat
= xpc_online_heartbeat_sn2
;
2158 xpc_heartbeat_init
= xpc_heartbeat_init_sn2
;
2159 xpc_heartbeat_exit
= xpc_heartbeat_exit_sn2
;
2160 xpc_check_remote_hb
= xpc_check_remote_hb_sn2
;
2162 xpc_request_partition_activation
= xpc_request_partition_activation_sn2
;
2163 xpc_request_partition_reactivation
=
2164 xpc_request_partition_reactivation_sn2
;
2165 xpc_request_partition_deactivation
=
2166 xpc_request_partition_deactivation_sn2
;
2167 xpc_cancel_partition_deactivation_request
=
2168 xpc_cancel_partition_deactivation_request_sn2
;
2170 xpc_process_activate_IRQ_rcvd
= xpc_process_activate_IRQ_rcvd_sn2
;
2171 xpc_setup_infrastructure
= xpc_setup_infrastructure_sn2
;
2172 xpc_teardown_infrastructure
= xpc_teardown_infrastructure_sn2
;
2173 xpc_make_first_contact
= xpc_make_first_contact_sn2
;
2174 xpc_get_chctl_all_flags
= xpc_get_chctl_all_flags_sn2
;
2175 xpc_notify_senders_of_disconnect
= xpc_notify_senders_of_disconnect_sn2
;
2176 xpc_process_msg_chctl_flags
= xpc_process_msg_chctl_flags_sn2
;
2177 xpc_n_of_deliverable_msgs
= xpc_n_of_deliverable_msgs_sn2
;
2178 xpc_get_deliverable_msg
= xpc_get_deliverable_msg_sn2
;
2180 xpc_indicate_partition_engaged
= xpc_indicate_partition_engaged_sn2
;
2181 xpc_partition_engaged
= xpc_partition_engaged_sn2
;
2182 xpc_any_partition_engaged
= xpc_any_partition_engaged_sn2
;
2183 xpc_indicate_partition_disengaged
=
2184 xpc_indicate_partition_disengaged_sn2
;
2185 xpc_assume_partition_disengaged
= xpc_assume_partition_disengaged_sn2
;
2187 xpc_send_chctl_closerequest
= xpc_send_chctl_closerequest_sn2
;
2188 xpc_send_chctl_closereply
= xpc_send_chctl_closereply_sn2
;
2189 xpc_send_chctl_openrequest
= xpc_send_chctl_openrequest_sn2
;
2190 xpc_send_chctl_openreply
= xpc_send_chctl_openreply_sn2
;
2192 xpc_send_msg
= xpc_send_msg_sn2
;
2193 xpc_received_msg
= xpc_received_msg_sn2
;
2195 /* open up protections for IPI and [potentially] AMO operations */
2196 xpc_allow_IPI_ops_sn2();
2197 xpc_allow_AMO_ops_shub_wars_1_1_sn2();
2200 * This is safe to do before the xpc_hb_checker thread has started
2201 * because the handler releases a wait queue. If an interrupt is
2202 * received before the thread is waiting, it will not go to sleep,
2203 * but rather immediately process the interrupt.
2205 ret
= request_irq(SGI_XPC_ACTIVATE
, xpc_handle_activate_IRQ_sn2
, 0,
2208 dev_err(xpc_part
, "can't register ACTIVATE IRQ handler, "
2209 "errno=%d\n", -ret
);
2210 xpc_disallow_IPI_ops_sn2();
2218 free_irq(SGI_XPC_ACTIVATE
, NULL
);
2219 xpc_disallow_IPI_ops_sn2();