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>
23 * Define the number of u64s required to represent all the C-brick nasids
24 * as a bitmap. The cross-partition kernel modules deal only with
25 * C-brick nasids, thus the need for bitmaps which don't account for
26 * odd-numbered (non C-brick) nasids.
28 #define XPC_MAX_PHYSNODES_SN2 (MAX_NUMALINK_NODES / 2)
29 #define XP_NASID_MASK_BYTES_SN2 ((XPC_MAX_PHYSNODES_SN2 + 7) / 8)
30 #define XP_NASID_MASK_WORDS_SN2 ((XPC_MAX_PHYSNODES_SN2 + 63) / 64)
33 * Memory for XPC's amo variables is allocated by the MSPEC driver. These
34 * pages are located in the lowest granule. The lowest granule uses 4k pages
35 * for cached references and an alternate TLB handler to never provide a
36 * cacheable mapping for the entire region. This will prevent speculative
37 * reading of cached copies of our lines from being issued which will cause
38 * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
39 * amo variables (based on XP_MAX_NPARTITIONS_SN2) to identify the senders of
40 * NOTIFY IRQs, 128 amo variables (based on XP_NASID_MASK_WORDS_SN2) to identify
41 * the senders of ACTIVATE IRQs, 1 amo variable to identify which remote
42 * partitions (i.e., XPCs) consider themselves currently engaged with the
43 * local XPC and 1 amo variable to request partition deactivation.
45 #define XPC_NOTIFY_IRQ_AMOS_SN2 0
46 #define XPC_ACTIVATE_IRQ_AMOS_SN2 (XPC_NOTIFY_IRQ_AMOS_SN2 + \
47 XP_MAX_NPARTITIONS_SN2)
48 #define XPC_ENGAGED_PARTITIONS_AMO_SN2 (XPC_ACTIVATE_IRQ_AMOS_SN2 + \
49 XP_NASID_MASK_WORDS_SN2)
50 #define XPC_DEACTIVATE_REQUEST_AMO_SN2 (XPC_ENGAGED_PARTITIONS_AMO_SN2 + 1)
53 * Buffer used to store a local copy of portions of a remote partition's
54 * reserved page (either its header and part_nasids mask, or its vars).
56 static char *xpc_remote_copy_buffer_sn2
;
57 static void *xpc_remote_copy_buffer_base_sn2
;
59 static struct xpc_vars_sn2
*xpc_vars_sn2
;
60 static struct xpc_vars_part_sn2
*xpc_vars_part_sn2
;
62 /* SH_IPI_ACCESS shub register value on startup */
63 static u64 xpc_sh1_IPI_access_sn2
;
64 static u64 xpc_sh2_IPI_access0_sn2
;
65 static u64 xpc_sh2_IPI_access1_sn2
;
66 static u64 xpc_sh2_IPI_access2_sn2
;
67 static u64 xpc_sh2_IPI_access3_sn2
;
70 * Change protections to allow IPI operations.
73 xpc_allow_IPI_ops_sn2(void)
78 /* !!! The following should get moved into SAL. */
80 xpc_sh2_IPI_access0_sn2
=
81 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH2_IPI_ACCESS0
));
82 xpc_sh2_IPI_access1_sn2
=
83 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH2_IPI_ACCESS1
));
84 xpc_sh2_IPI_access2_sn2
=
85 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH2_IPI_ACCESS2
));
86 xpc_sh2_IPI_access3_sn2
=
87 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH2_IPI_ACCESS3
));
89 for_each_online_node(node
) {
90 nasid
= cnodeid_to_nasid(node
);
91 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS0
),
93 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS1
),
95 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS2
),
97 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS3
),
101 xpc_sh1_IPI_access_sn2
=
102 (u64
)HUB_L((u64
*)LOCAL_MMR_ADDR(SH1_IPI_ACCESS
));
104 for_each_online_node(node
) {
105 nasid
= cnodeid_to_nasid(node
);
106 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH1_IPI_ACCESS
),
113 * Restrict protections to disallow IPI operations.
116 xpc_disallow_IPI_ops_sn2(void)
121 /* !!! The following should get moved into SAL. */
123 for_each_online_node(node
) {
124 nasid
= cnodeid_to_nasid(node
);
125 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS0
),
126 xpc_sh2_IPI_access0_sn2
);
127 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS1
),
128 xpc_sh2_IPI_access1_sn2
);
129 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS2
),
130 xpc_sh2_IPI_access2_sn2
);
131 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH2_IPI_ACCESS3
),
132 xpc_sh2_IPI_access3_sn2
);
135 for_each_online_node(node
) {
136 nasid
= cnodeid_to_nasid(node
);
137 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
, SH1_IPI_ACCESS
),
138 xpc_sh1_IPI_access_sn2
);
144 * The following set of functions are used for the sending and receiving of
145 * IRQs (also known as IPIs). There are two flavors of IRQs, one that is
146 * associated with partition activity (SGI_XPC_ACTIVATE) and the other that
147 * is associated with channel activity (SGI_XPC_NOTIFY).
151 xpc_receive_IRQ_amo_sn2(struct amo
*amo
)
153 return FETCHOP_LOAD_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_CLEAR
);
156 static enum xp_retval
157 xpc_send_IRQ_sn2(struct amo
*amo
, u64 flag
, int nasid
, int phys_cpuid
,
161 unsigned long irq_flags
;
163 local_irq_save(irq_flags
);
165 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_OR
, flag
);
166 sn_send_IPI_phys(nasid
, phys_cpuid
, vector
, 0);
169 * We must always use the nofault function regardless of whether we
170 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
171 * didn't, we'd never know that the other partition is down and would
172 * keep sending IRQs and amos to it until the heartbeat times out.
174 ret
= xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->variable
),
175 xp_nofault_PIOR_target
));
177 local_irq_restore(irq_flags
);
179 return ((ret
== 0) ? xpSuccess
: xpPioReadError
);
183 xpc_init_IRQ_amo_sn2(int index
)
185 struct amo
*amo
= xpc_vars_sn2
->amos_page
+ index
;
187 (void)xpc_receive_IRQ_amo_sn2(amo
); /* clear amo variable */
192 * Functions associated with SGI_XPC_ACTIVATE IRQ.
196 * Notify the heartbeat check thread that an activate IRQ has been received.
199 xpc_handle_activate_IRQ_sn2(int irq
, void *dev_id
)
201 atomic_inc(&xpc_activate_IRQ_rcvd
);
202 wake_up_interruptible(&xpc_activate_IRQ_wq
);
207 * Flag the appropriate amo variable and send an IRQ to the specified node.
210 xpc_send_activate_IRQ_sn2(u64 amos_page_pa
, int from_nasid
, int to_nasid
,
213 int w_index
= XPC_NASID_W_INDEX(from_nasid
);
214 int b_index
= XPC_NASID_B_INDEX(from_nasid
);
215 struct amo
*amos
= (struct amo
*)__va(amos_page_pa
+
216 (XPC_ACTIVATE_IRQ_AMOS_SN2
*
217 sizeof(struct amo
)));
219 (void)xpc_send_IRQ_sn2(&amos
[w_index
], (1UL << b_index
), to_nasid
,
220 to_phys_cpuid
, SGI_XPC_ACTIVATE
);
224 xpc_send_local_activate_IRQ_sn2(int from_nasid
)
226 int w_index
= XPC_NASID_W_INDEX(from_nasid
);
227 int b_index
= XPC_NASID_B_INDEX(from_nasid
);
228 struct amo
*amos
= (struct amo
*)__va(xpc_vars_sn2
->amos_page_pa
+
229 (XPC_ACTIVATE_IRQ_AMOS_SN2
*
230 sizeof(struct amo
)));
232 /* fake the sending and receipt of an activate IRQ from remote nasid */
233 FETCHOP_STORE_OP(TO_AMO((u64
)&amos
[w_index
].variable
), FETCHOP_OR
,
235 atomic_inc(&xpc_activate_IRQ_rcvd
);
236 wake_up_interruptible(&xpc_activate_IRQ_wq
);
240 * Functions associated with SGI_XPC_NOTIFY IRQ.
244 * Check to see if any chctl flags were sent from the specified partition.
247 xpc_check_for_sent_chctl_flags_sn2(struct xpc_partition
*part
)
249 union xpc_channel_ctl_flags chctl
;
250 unsigned long irq_flags
;
252 chctl
.all_flags
= xpc_receive_IRQ_amo_sn2(part
->sn
.sn2
.
254 if (chctl
.all_flags
== 0)
257 spin_lock_irqsave(&part
->chctl_lock
, irq_flags
);
258 part
->chctl
.all_flags
|= chctl
.all_flags
;
259 spin_unlock_irqrestore(&part
->chctl_lock
, irq_flags
);
261 dev_dbg(xpc_chan
, "received notify IRQ from partid=%d, chctl.all_flags="
262 "0x%lx\n", XPC_PARTID(part
), chctl
.all_flags
);
264 xpc_wakeup_channel_mgr(part
);
268 * Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified
269 * partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more
270 * than one partition, we use an amo structure per partition to indicate
271 * whether a partition has sent an IRQ or not. If it has, then wake up the
272 * associated kthread to handle it.
274 * All SGI_XPC_NOTIFY IRQs received by XPC are the result of IRQs sent by XPC
275 * running on other partitions.
277 * Noteworthy Arguments:
279 * irq - Interrupt ReQuest number. NOT USED.
281 * dev_id - partid of IRQ's potential sender.
284 xpc_handle_notify_IRQ_sn2(int irq
, void *dev_id
)
286 short partid
= (short)(u64
)dev_id
;
287 struct xpc_partition
*part
= &xpc_partitions
[partid
];
289 DBUG_ON(partid
< 0 || partid
>= xp_max_npartitions
);
291 if (xpc_part_ref(part
)) {
292 xpc_check_for_sent_chctl_flags_sn2(part
);
294 xpc_part_deref(part
);
300 * Check to see if xpc_handle_notify_IRQ_sn2() dropped any IRQs on the floor
301 * because the write to their associated amo variable completed after the IRQ
305 xpc_check_for_dropped_notify_IRQ_sn2(struct xpc_partition
*part
)
307 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
309 if (xpc_part_ref(part
)) {
310 xpc_check_for_sent_chctl_flags_sn2(part
);
312 part_sn2
->dropped_notify_IRQ_timer
.expires
= jiffies
+
313 XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL
;
314 add_timer(&part_sn2
->dropped_notify_IRQ_timer
);
315 xpc_part_deref(part
);
320 * Send a notify IRQ to the remote partition that is associated with the
324 xpc_send_notify_IRQ_sn2(struct xpc_channel
*ch
, u8 chctl_flag
,
325 char *chctl_flag_string
, unsigned long *irq_flags
)
327 struct xpc_partition
*part
= &xpc_partitions
[ch
->partid
];
328 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
329 union xpc_channel_ctl_flags chctl
= { 0 };
332 if (likely(part
->act_state
!= XPC_P_DEACTIVATING
)) {
333 chctl
.flags
[ch
->number
] = chctl_flag
;
334 ret
= xpc_send_IRQ_sn2(part_sn2
->remote_chctl_amo_va
,
336 part_sn2
->notify_IRQ_nasid
,
337 part_sn2
->notify_IRQ_phys_cpuid
,
339 dev_dbg(xpc_chan
, "%s sent to partid=%d, channel=%d, ret=%d\n",
340 chctl_flag_string
, ch
->partid
, ch
->number
, ret
);
341 if (unlikely(ret
!= xpSuccess
)) {
342 if (irq_flags
!= NULL
)
343 spin_unlock_irqrestore(&ch
->lock
, *irq_flags
);
344 XPC_DEACTIVATE_PARTITION(part
, ret
);
345 if (irq_flags
!= NULL
)
346 spin_lock_irqsave(&ch
->lock
, *irq_flags
);
351 #define XPC_SEND_NOTIFY_IRQ_SN2(_ch, _ipi_f, _irq_f) \
352 xpc_send_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f, _irq_f)
355 * Make it look like the remote partition, which is associated with the
356 * specified channel, sent us a notify IRQ. This faked IRQ will be handled
357 * by xpc_check_for_dropped_notify_IRQ_sn2().
360 xpc_send_local_notify_IRQ_sn2(struct xpc_channel
*ch
, u8 chctl_flag
,
361 char *chctl_flag_string
)
363 struct xpc_partition
*part
= &xpc_partitions
[ch
->partid
];
364 union xpc_channel_ctl_flags chctl
= { 0 };
366 chctl
.flags
[ch
->number
] = chctl_flag
;
367 FETCHOP_STORE_OP(TO_AMO((u64
)&part
->sn
.sn2
.local_chctl_amo_va
->
368 variable
), FETCHOP_OR
, chctl
.all_flags
);
369 dev_dbg(xpc_chan
, "%s sent local from partid=%d, channel=%d\n",
370 chctl_flag_string
, ch
->partid
, ch
->number
);
373 #define XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(_ch, _ipi_f) \
374 xpc_send_local_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f)
377 xpc_send_chctl_closerequest_sn2(struct xpc_channel
*ch
,
378 unsigned long *irq_flags
)
380 struct xpc_openclose_args
*args
= ch
->local_openclose_args
;
382 args
->reason
= ch
->reason
;
383 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_CLOSEREQUEST
, irq_flags
);
387 xpc_send_chctl_closereply_sn2(struct xpc_channel
*ch
, unsigned long *irq_flags
)
389 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_CLOSEREPLY
, irq_flags
);
393 xpc_send_chctl_openrequest_sn2(struct xpc_channel
*ch
, unsigned long *irq_flags
)
395 struct xpc_openclose_args
*args
= ch
->local_openclose_args
;
397 args
->msg_size
= ch
->msg_size
;
398 args
->local_nentries
= ch
->local_nentries
;
399 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_OPENREQUEST
, irq_flags
);
403 xpc_send_chctl_openreply_sn2(struct xpc_channel
*ch
, unsigned long *irq_flags
)
405 struct xpc_openclose_args
*args
= ch
->local_openclose_args
;
407 args
->remote_nentries
= ch
->remote_nentries
;
408 args
->local_nentries
= ch
->local_nentries
;
409 args
->local_msgqueue_pa
= __pa(ch
->local_msgqueue
);
410 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_OPENREPLY
, irq_flags
);
414 xpc_send_chctl_msgrequest_sn2(struct xpc_channel
*ch
)
416 XPC_SEND_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_MSGREQUEST
, NULL
);
420 xpc_send_chctl_local_msgrequest_sn2(struct xpc_channel
*ch
)
422 XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(ch
, XPC_CHCTL_MSGREQUEST
);
426 * This next set of functions are used to keep track of when a partition is
427 * potentially engaged in accessing memory belonging to another partition.
431 xpc_indicate_partition_engaged_sn2(struct xpc_partition
*part
)
433 unsigned long irq_flags
;
434 struct amo
*amo
= (struct amo
*)__va(part
->sn
.sn2
.remote_amos_page_pa
+
435 (XPC_ENGAGED_PARTITIONS_AMO_SN2
*
436 sizeof(struct amo
)));
438 local_irq_save(irq_flags
);
440 /* set bit corresponding to our partid in remote partition's amo */
441 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_OR
,
442 (1UL << sn_partition_id
));
444 * We must always use the nofault function regardless of whether we
445 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
446 * didn't, we'd never know that the other partition is down and would
447 * keep sending IRQs and amos to it until the heartbeat times out.
449 (void)xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->
451 xp_nofault_PIOR_target
));
453 local_irq_restore(irq_flags
);
457 xpc_indicate_partition_disengaged_sn2(struct xpc_partition
*part
)
459 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
460 unsigned long irq_flags
;
461 struct amo
*amo
= (struct amo
*)__va(part_sn2
->remote_amos_page_pa
+
462 (XPC_ENGAGED_PARTITIONS_AMO_SN2
*
463 sizeof(struct amo
)));
465 local_irq_save(irq_flags
);
467 /* clear bit corresponding to our partid in remote partition's amo */
468 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_AND
,
469 ~(1UL << sn_partition_id
));
471 * We must always use the nofault function regardless of whether we
472 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
473 * didn't, we'd never know that the other partition is down and would
474 * keep sending IRQs and amos to it until the heartbeat times out.
476 (void)xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->
478 xp_nofault_PIOR_target
));
480 local_irq_restore(irq_flags
);
483 * Send activate IRQ to get other side to see that we've cleared our
484 * bit in their engaged partitions amo.
486 xpc_send_activate_IRQ_sn2(part_sn2
->remote_amos_page_pa
,
488 part_sn2
->activate_IRQ_nasid
,
489 part_sn2
->activate_IRQ_phys_cpuid
);
493 xpc_partition_engaged_sn2(short partid
)
495 struct amo
*amo
= xpc_vars_sn2
->amos_page
+
496 XPC_ENGAGED_PARTITIONS_AMO_SN2
;
498 /* our partition's amo variable ANDed with partid mask */
499 return (FETCHOP_LOAD_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_LOAD
) &
500 (1UL << partid
)) != 0;
504 xpc_any_partition_engaged_sn2(void)
506 struct amo
*amo
= xpc_vars_sn2
->amos_page
+
507 XPC_ENGAGED_PARTITIONS_AMO_SN2
;
509 /* our partition's amo variable */
510 return FETCHOP_LOAD_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_LOAD
) != 0;
514 xpc_assume_partition_disengaged_sn2(short partid
)
516 struct amo
*amo
= xpc_vars_sn2
->amos_page
+
517 XPC_ENGAGED_PARTITIONS_AMO_SN2
;
519 /* clear bit(s) based on partid mask in our partition's amo */
520 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_AND
,
524 /* original protection values for each node */
525 static u64 xpc_prot_vec_sn2
[MAX_NUMNODES
];
528 * Change protections to allow amo operations on non-Shub 1.1 systems.
530 static enum xp_retval
531 xpc_allow_amo_ops_sn2(struct amo
*amos_page
)
537 * On SHUB 1.1, we cannot call sn_change_memprotect() since the BIST
538 * collides with memory operations. On those systems we call
539 * xpc_allow_amo_ops_shub_wars_1_1_sn2() instead.
541 if (!enable_shub_wars_1_1()) {
542 ret
= sn_change_memprotect(ia64_tpa((u64
)amos_page
), PAGE_SIZE
,
543 SN_MEMPROT_ACCESS_CLASS_1
,
552 * Change protections to allow amo operations on Shub 1.1 systems.
555 xpc_allow_amo_ops_shub_wars_1_1_sn2(void)
560 if (!enable_shub_wars_1_1())
563 for_each_online_node(node
) {
564 nasid
= cnodeid_to_nasid(node
);
565 /* save current protection values */
566 xpc_prot_vec_sn2
[node
] =
567 (u64
)HUB_L((u64
*)GLOBAL_MMR_ADDR(nasid
,
568 SH1_MD_DQLP_MMR_DIR_PRIVEC0
));
569 /* open up everything */
570 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
,
571 SH1_MD_DQLP_MMR_DIR_PRIVEC0
),
573 HUB_S((u64
*)GLOBAL_MMR_ADDR(nasid
,
574 SH1_MD_DQRP_MMR_DIR_PRIVEC0
),
579 static enum xp_retval
580 xpc_rsvd_page_init_sn2(struct xpc_rsvd_page
*rp
)
582 struct amo
*amos_page
;
586 xpc_vars_sn2
= XPC_RP_VARS(rp
);
588 rp
->sn
.vars_pa
= __pa(xpc_vars_sn2
);
590 /* vars_part array follows immediately after vars */
591 xpc_vars_part_sn2
= (struct xpc_vars_part_sn2
*)((u8
*)XPC_RP_VARS(rp
) +
595 * Before clearing xpc_vars_sn2, see if a page of amos had been
596 * previously allocated. If not we'll need to allocate one and set
597 * permissions so that cross-partition amos are allowed.
599 * The allocated amo page needs MCA reporting to remain disabled after
600 * XPC has unloaded. To make this work, we keep a copy of the pointer
601 * to this page (i.e., amos_page) in the struct xpc_vars_sn2 structure,
602 * which is pointed to by the reserved page, and re-use that saved copy
603 * on subsequent loads of XPC. This amo page is never freed, and its
604 * memory protections are never restricted.
606 amos_page
= xpc_vars_sn2
->amos_page
;
607 if (amos_page
== NULL
) {
608 amos_page
= (struct amo
*)TO_AMO(uncached_alloc_page(0, 1));
609 if (amos_page
== NULL
) {
610 dev_err(xpc_part
, "can't allocate page of amos\n");
615 * Open up amo-R/W to cpu. This is done on Shub 1.1 systems
616 * when xpc_allow_amo_ops_shub_wars_1_1_sn2() is called.
618 ret
= xpc_allow_amo_ops_sn2(amos_page
);
619 if (ret
!= xpSuccess
) {
620 dev_err(xpc_part
, "can't allow amo operations\n");
621 uncached_free_page(__IA64_UNCACHED_OFFSET
|
622 TO_PHYS((u64
)amos_page
), 1);
627 /* clear xpc_vars_sn2 */
628 memset(xpc_vars_sn2
, 0, sizeof(struct xpc_vars_sn2
));
630 xpc_vars_sn2
->version
= XPC_V_VERSION
;
631 xpc_vars_sn2
->activate_IRQ_nasid
= cpuid_to_nasid(0);
632 xpc_vars_sn2
->activate_IRQ_phys_cpuid
= cpu_physical_id(0);
633 xpc_vars_sn2
->vars_part_pa
= __pa(xpc_vars_part_sn2
);
634 xpc_vars_sn2
->amos_page_pa
= ia64_tpa((u64
)amos_page
);
635 xpc_vars_sn2
->amos_page
= amos_page
; /* save for next load of XPC */
637 /* clear xpc_vars_part_sn2 */
638 memset((u64
*)xpc_vars_part_sn2
, 0, sizeof(struct xpc_vars_part_sn2
) *
641 /* initialize the activate IRQ related amo variables */
642 for (i
= 0; i
< xpc_nasid_mask_words
; i
++)
643 (void)xpc_init_IRQ_amo_sn2(XPC_ACTIVATE_IRQ_AMOS_SN2
+ i
);
645 /* initialize the engaged remote partitions related amo variables */
646 (void)xpc_init_IRQ_amo_sn2(XPC_ENGAGED_PARTITIONS_AMO_SN2
);
647 (void)xpc_init_IRQ_amo_sn2(XPC_DEACTIVATE_REQUEST_AMO_SN2
);
653 xpc_increment_heartbeat_sn2(void)
655 xpc_vars_sn2
->heartbeat
++;
659 xpc_offline_heartbeat_sn2(void)
661 xpc_increment_heartbeat_sn2();
662 xpc_vars_sn2
->heartbeat_offline
= 1;
666 xpc_online_heartbeat_sn2(void)
668 xpc_increment_heartbeat_sn2();
669 xpc_vars_sn2
->heartbeat_offline
= 0;
673 xpc_heartbeat_init_sn2(void)
675 DBUG_ON(xpc_vars_sn2
== NULL
);
677 bitmap_zero(xpc_vars_sn2
->heartbeating_to_mask
, XP_MAX_NPARTITIONS_SN2
);
678 xpc_heartbeating_to_mask
= &xpc_vars_sn2
->heartbeating_to_mask
[0];
679 xpc_online_heartbeat_sn2();
683 xpc_heartbeat_exit_sn2(void)
685 xpc_offline_heartbeat_sn2();
689 * At periodic intervals, scan through all active partitions and ensure
690 * their heartbeat is still active. If not, the partition is deactivated.
693 xpc_check_remote_hb_sn2(void)
695 struct xpc_vars_sn2
*remote_vars
;
696 struct xpc_partition
*part
;
700 remote_vars
= (struct xpc_vars_sn2
*)xpc_remote_copy_buffer_sn2
;
702 for (partid
= 0; partid
< xp_max_npartitions
; partid
++) {
707 if (partid
== sn_partition_id
)
710 part
= &xpc_partitions
[partid
];
712 if (part
->act_state
== XPC_P_INACTIVE
||
713 part
->act_state
== XPC_P_DEACTIVATING
) {
717 /* pull the remote_hb cache line */
718 ret
= xp_remote_memcpy(remote_vars
,
719 (void *)part
->sn
.sn2
.remote_vars_pa
,
721 if (ret
!= xpSuccess
) {
722 XPC_DEACTIVATE_PARTITION(part
, ret
);
726 dev_dbg(xpc_part
, "partid = %d, heartbeat = %ld, last_heartbeat"
727 " = %ld, heartbeat_offline = %ld, HB_mask[0] = 0x%lx\n",
728 partid
, remote_vars
->heartbeat
, part
->last_heartbeat
,
729 remote_vars
->heartbeat_offline
,
730 remote_vars
->heartbeating_to_mask
[0]);
732 if (((remote_vars
->heartbeat
== part
->last_heartbeat
) &&
733 (remote_vars
->heartbeat_offline
== 0)) ||
734 !xpc_hb_allowed(sn_partition_id
,
735 &remote_vars
->heartbeating_to_mask
)) {
737 XPC_DEACTIVATE_PARTITION(part
, xpNoHeartbeat
);
741 part
->last_heartbeat
= remote_vars
->heartbeat
;
746 * Get a copy of the remote partition's XPC variables from the reserved page.
748 * remote_vars points to a buffer that is cacheline aligned for BTE copies and
749 * assumed to be of size XPC_RP_VARS_SIZE.
751 static enum xp_retval
752 xpc_get_remote_vars_sn2(u64 remote_vars_pa
, struct xpc_vars_sn2
*remote_vars
)
756 if (remote_vars_pa
== 0)
759 /* pull over the cross partition variables */
760 ret
= xp_remote_memcpy(remote_vars
, (void *)remote_vars_pa
,
762 if (ret
!= xpSuccess
)
765 if (XPC_VERSION_MAJOR(remote_vars
->version
) !=
766 XPC_VERSION_MAJOR(XPC_V_VERSION
)) {
774 xpc_request_partition_activation_sn2(struct xpc_rsvd_page
*remote_rp
,
775 u64 remote_rp_pa
, int nasid
)
777 xpc_send_local_activate_IRQ_sn2(nasid
);
781 xpc_request_partition_reactivation_sn2(struct xpc_partition
*part
)
783 xpc_send_local_activate_IRQ_sn2(part
->sn
.sn2
.activate_IRQ_nasid
);
787 xpc_request_partition_deactivation_sn2(struct xpc_partition
*part
)
789 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
790 unsigned long irq_flags
;
791 struct amo
*amo
= (struct amo
*)__va(part_sn2
->remote_amos_page_pa
+
792 (XPC_DEACTIVATE_REQUEST_AMO_SN2
*
793 sizeof(struct amo
)));
795 local_irq_save(irq_flags
);
797 /* set bit corresponding to our partid in remote partition's amo */
798 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_OR
,
799 (1UL << sn_partition_id
));
801 * We must always use the nofault function regardless of whether we
802 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
803 * didn't, we'd never know that the other partition is down and would
804 * keep sending IRQs and amos to it until the heartbeat times out.
806 (void)xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->
808 xp_nofault_PIOR_target
));
810 local_irq_restore(irq_flags
);
813 * Send activate IRQ to get other side to see that we've set our
814 * bit in their deactivate request amo.
816 xpc_send_activate_IRQ_sn2(part_sn2
->remote_amos_page_pa
,
818 part_sn2
->activate_IRQ_nasid
,
819 part_sn2
->activate_IRQ_phys_cpuid
);
823 xpc_cancel_partition_deactivation_request_sn2(struct xpc_partition
*part
)
825 unsigned long irq_flags
;
826 struct amo
*amo
= (struct amo
*)__va(part
->sn
.sn2
.remote_amos_page_pa
+
827 (XPC_DEACTIVATE_REQUEST_AMO_SN2
*
828 sizeof(struct amo
)));
830 local_irq_save(irq_flags
);
832 /* clear bit corresponding to our partid in remote partition's amo */
833 FETCHOP_STORE_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_AND
,
834 ~(1UL << sn_partition_id
));
836 * We must always use the nofault function regardless of whether we
837 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
838 * didn't, we'd never know that the other partition is down and would
839 * keep sending IRQs and amos to it until the heartbeat times out.
841 (void)xp_nofault_PIOR((u64
*)GLOBAL_MMR_ADDR(NASID_GET(&amo
->
843 xp_nofault_PIOR_target
));
845 local_irq_restore(irq_flags
);
849 xpc_partition_deactivation_requested_sn2(short partid
)
851 struct amo
*amo
= xpc_vars_sn2
->amos_page
+
852 XPC_DEACTIVATE_REQUEST_AMO_SN2
;
854 /* our partition's amo variable ANDed with partid mask */
855 return (FETCHOP_LOAD_OP(TO_AMO((u64
)&amo
->variable
), FETCHOP_LOAD
) &
856 (1UL << partid
)) != 0;
860 * Update the remote partition's info.
863 xpc_update_partition_info_sn2(struct xpc_partition
*part
, u8 remote_rp_version
,
864 unsigned long *remote_rp_stamp
, u64 remote_rp_pa
,
866 struct xpc_vars_sn2
*remote_vars
)
868 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
870 part
->remote_rp_version
= remote_rp_version
;
871 dev_dbg(xpc_part
, " remote_rp_version = 0x%016x\n",
872 part
->remote_rp_version
);
874 part
->remote_rp_stamp
= *remote_rp_stamp
;
875 dev_dbg(xpc_part
, " remote_rp_stamp = 0x%016lx\n",
876 part
->remote_rp_stamp
);
878 part
->remote_rp_pa
= remote_rp_pa
;
879 dev_dbg(xpc_part
, " remote_rp_pa = 0x%016lx\n", part
->remote_rp_pa
);
881 part_sn2
->remote_vars_pa
= remote_vars_pa
;
882 dev_dbg(xpc_part
, " remote_vars_pa = 0x%016lx\n",
883 part_sn2
->remote_vars_pa
);
885 part
->last_heartbeat
= remote_vars
->heartbeat
;
886 dev_dbg(xpc_part
, " last_heartbeat = 0x%016lx\n",
887 part
->last_heartbeat
);
889 part_sn2
->remote_vars_part_pa
= remote_vars
->vars_part_pa
;
890 dev_dbg(xpc_part
, " remote_vars_part_pa = 0x%016lx\n",
891 part_sn2
->remote_vars_part_pa
);
893 part_sn2
->activate_IRQ_nasid
= remote_vars
->activate_IRQ_nasid
;
894 dev_dbg(xpc_part
, " activate_IRQ_nasid = 0x%x\n",
895 part_sn2
->activate_IRQ_nasid
);
897 part_sn2
->activate_IRQ_phys_cpuid
=
898 remote_vars
->activate_IRQ_phys_cpuid
;
899 dev_dbg(xpc_part
, " activate_IRQ_phys_cpuid = 0x%x\n",
900 part_sn2
->activate_IRQ_phys_cpuid
);
902 part_sn2
->remote_amos_page_pa
= remote_vars
->amos_page_pa
;
903 dev_dbg(xpc_part
, " remote_amos_page_pa = 0x%lx\n",
904 part_sn2
->remote_amos_page_pa
);
906 part_sn2
->remote_vars_version
= remote_vars
->version
;
907 dev_dbg(xpc_part
, " remote_vars_version = 0x%x\n",
908 part_sn2
->remote_vars_version
);
912 * Prior code has determined the nasid which generated a activate IRQ.
913 * Inspect that nasid to determine if its partition needs to be activated
916 * A partition is considered "awaiting activation" if our partition
917 * flags indicate it is not active and it has a heartbeat. A
918 * partition is considered "awaiting deactivation" if our partition
919 * flags indicate it is active but it has no heartbeat or it is not
920 * sending its heartbeat to us.
922 * To determine the heartbeat, the remote nasid must have a properly
923 * initialized reserved page.
926 xpc_identify_activate_IRQ_req_sn2(int nasid
)
928 struct xpc_rsvd_page
*remote_rp
;
929 struct xpc_vars_sn2
*remote_vars
;
932 int remote_rp_version
;
934 unsigned long remote_rp_stamp
= 0;
936 struct xpc_partition
*part
;
937 struct xpc_partition_sn2
*part_sn2
;
940 /* pull over the reserved page structure */
942 remote_rp
= (struct xpc_rsvd_page
*)xpc_remote_copy_buffer_sn2
;
944 ret
= xpc_get_remote_rp(nasid
, NULL
, remote_rp
, &remote_rp_pa
);
945 if (ret
!= xpSuccess
) {
946 dev_warn(xpc_part
, "unable to get reserved page from nasid %d, "
947 "which sent interrupt, reason=%d\n", nasid
, ret
);
951 remote_vars_pa
= remote_rp
->sn
.vars_pa
;
952 remote_rp_version
= remote_rp
->version
;
953 remote_rp_stamp
= remote_rp
->stamp
;
955 partid
= remote_rp
->SAL_partid
;
956 part
= &xpc_partitions
[partid
];
957 part_sn2
= &part
->sn
.sn2
;
959 /* pull over the cross partition variables */
961 remote_vars
= (struct xpc_vars_sn2
*)xpc_remote_copy_buffer_sn2
;
963 ret
= xpc_get_remote_vars_sn2(remote_vars_pa
, remote_vars
);
964 if (ret
!= xpSuccess
) {
965 dev_warn(xpc_part
, "unable to get XPC variables from nasid %d, "
966 "which sent interrupt, reason=%d\n", nasid
, ret
);
968 XPC_DEACTIVATE_PARTITION(part
, ret
);
972 part
->activate_IRQ_rcvd
++;
974 dev_dbg(xpc_part
, "partid for nasid %d is %d; IRQs = %d; HB = "
975 "%ld:0x%lx\n", (int)nasid
, (int)partid
, part
->activate_IRQ_rcvd
,
976 remote_vars
->heartbeat
, remote_vars
->heartbeating_to_mask
[0]);
978 if (xpc_partition_disengaged(part
) &&
979 part
->act_state
== XPC_P_INACTIVE
) {
981 xpc_update_partition_info_sn2(part
, remote_rp_version
,
982 &remote_rp_stamp
, remote_rp_pa
,
983 remote_vars_pa
, remote_vars
);
985 if (xpc_partition_deactivation_requested_sn2(partid
)) {
987 * Other side is waiting on us to deactivate even though
993 xpc_activate_partition(part
);
997 DBUG_ON(part
->remote_rp_version
== 0);
998 DBUG_ON(part_sn2
->remote_vars_version
== 0);
1000 if (remote_rp_stamp
!= part
->remote_rp_stamp
) {
1002 /* the other side rebooted */
1004 DBUG_ON(xpc_partition_engaged_sn2(partid
));
1005 DBUG_ON(xpc_partition_deactivation_requested_sn2(partid
));
1007 xpc_update_partition_info_sn2(part
, remote_rp_version
,
1008 &remote_rp_stamp
, remote_rp_pa
,
1009 remote_vars_pa
, remote_vars
);
1013 if (part
->disengage_timeout
> 0 && !xpc_partition_disengaged(part
)) {
1014 /* still waiting on other side to disengage from us */
1019 XPC_DEACTIVATE_PARTITION(part
, xpReactivating
);
1020 else if (xpc_partition_deactivation_requested_sn2(partid
))
1021 XPC_DEACTIVATE_PARTITION(part
, xpOtherGoingDown
);
1025 * Loop through the activation amo variables and process any bits
1026 * which are set. Each bit indicates a nasid sending a partition
1027 * activation or deactivation request.
1029 * Return #of IRQs detected.
1032 xpc_identify_activate_IRQ_sender_sn2(void)
1036 u64 nasid
; /* remote nasid */
1037 int n_IRQs_detected
= 0;
1038 struct amo
*act_amos
;
1040 act_amos
= xpc_vars_sn2
->amos_page
+ XPC_ACTIVATE_IRQ_AMOS_SN2
;
1042 /* scan through act amo variable looking for non-zero entries */
1043 for (word
= 0; word
< xpc_nasid_mask_words
; word
++) {
1048 nasid_mask
= xpc_receive_IRQ_amo_sn2(&act_amos
[word
]);
1049 if (nasid_mask
== 0) {
1050 /* no IRQs from nasids in this variable */
1054 dev_dbg(xpc_part
, "amo[%d] gave back 0x%lx\n", word
,
1058 * If this nasid has been added to the machine since
1059 * our partition was reset, this will retain the
1060 * remote nasid in our reserved pages machine mask.
1061 * This is used in the event of module reload.
1063 xpc_mach_nasids
[word
] |= nasid_mask
;
1065 /* locate the nasid(s) which sent interrupts */
1067 for (bit
= 0; bit
< (8 * sizeof(u64
)); bit
++) {
1068 if (nasid_mask
& (1UL << bit
)) {
1070 nasid
= XPC_NASID_FROM_W_B(word
, bit
);
1071 dev_dbg(xpc_part
, "interrupt from nasid %ld\n",
1073 xpc_identify_activate_IRQ_req_sn2(nasid
);
1077 return n_IRQs_detected
;
1081 xpc_process_activate_IRQ_rcvd_sn2(int n_IRQs_expected
)
1083 int n_IRQs_detected
;
1085 n_IRQs_detected
= xpc_identify_activate_IRQ_sender_sn2();
1086 if (n_IRQs_detected
< n_IRQs_expected
) {
1087 /* retry once to help avoid missing amo */
1088 (void)xpc_identify_activate_IRQ_sender_sn2();
1093 * Guarantee that the kzalloc'd memory is cacheline aligned.
1096 xpc_kzalloc_cacheline_aligned_sn2(size_t size
, gfp_t flags
, void **base
)
1098 /* see if kzalloc will give us cachline aligned memory by default */
1099 *base
= kzalloc(size
, flags
);
1103 if ((u64
)*base
== L1_CACHE_ALIGN((u64
)*base
))
1108 /* nope, we'll have to do it ourselves */
1109 *base
= kzalloc(size
+ L1_CACHE_BYTES
, flags
);
1113 return (void *)L1_CACHE_ALIGN((u64
)*base
);
1117 * Setup the infrastructure necessary to support XPartition Communication
1118 * between the specified remote partition and the local one.
1120 static enum xp_retval
1121 xpc_setup_infrastructure_sn2(struct xpc_partition
*part
)
1123 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1124 enum xp_retval retval
;
1128 struct xpc_channel
*ch
;
1129 struct timer_list
*timer
;
1130 short partid
= XPC_PARTID(part
);
1133 * Allocate all of the channel structures as a contiguous chunk of
1136 DBUG_ON(part
->channels
!= NULL
);
1137 part
->channels
= kzalloc(sizeof(struct xpc_channel
) * XPC_MAX_NCHANNELS
,
1139 if (part
->channels
== NULL
) {
1140 dev_err(xpc_chan
, "can't get memory for channels\n");
1144 /* allocate all the required GET/PUT values */
1146 part_sn2
->local_GPs
=
1147 xpc_kzalloc_cacheline_aligned_sn2(XPC_GP_SIZE
, GFP_KERNEL
,
1148 &part_sn2
->local_GPs_base
);
1149 if (part_sn2
->local_GPs
== NULL
) {
1150 dev_err(xpc_chan
, "can't get memory for local get/put "
1152 retval
= xpNoMemory
;
1156 part_sn2
->remote_GPs
=
1157 xpc_kzalloc_cacheline_aligned_sn2(XPC_GP_SIZE
, GFP_KERNEL
,
1158 &part_sn2
->remote_GPs_base
);
1159 if (part_sn2
->remote_GPs
== NULL
) {
1160 dev_err(xpc_chan
, "can't get memory for remote get/put "
1162 retval
= xpNoMemory
;
1166 part_sn2
->remote_GPs_pa
= 0;
1168 /* allocate all the required open and close args */
1170 part
->local_openclose_args
=
1171 xpc_kzalloc_cacheline_aligned_sn2(XPC_OPENCLOSE_ARGS_SIZE
,
1173 &part
->local_openclose_args_base
);
1174 if (part
->local_openclose_args
== NULL
) {
1175 dev_err(xpc_chan
, "can't get memory for local connect args\n");
1176 retval
= xpNoMemory
;
1180 part
->remote_openclose_args
=
1181 xpc_kzalloc_cacheline_aligned_sn2(XPC_OPENCLOSE_ARGS_SIZE
,
1183 &part
->remote_openclose_args_base
);
1184 if (part
->remote_openclose_args
== NULL
) {
1185 dev_err(xpc_chan
, "can't get memory for remote connect args\n");
1186 retval
= xpNoMemory
;
1190 part_sn2
->remote_openclose_args_pa
= 0;
1192 part_sn2
->local_chctl_amo_va
= xpc_init_IRQ_amo_sn2(partid
);
1193 part
->chctl
.all_flags
= 0;
1194 spin_lock_init(&part
->chctl_lock
);
1196 part_sn2
->notify_IRQ_nasid
= 0;
1197 part_sn2
->notify_IRQ_phys_cpuid
= 0;
1198 part_sn2
->remote_chctl_amo_va
= NULL
;
1200 atomic_set(&part
->channel_mgr_requests
, 1);
1201 init_waitqueue_head(&part
->channel_mgr_wq
);
1203 sprintf(part_sn2
->notify_IRQ_owner
, "xpc%02d", partid
);
1204 ret
= request_irq(SGI_XPC_NOTIFY
, xpc_handle_notify_IRQ_sn2
,
1205 IRQF_SHARED
, part_sn2
->notify_IRQ_owner
,
1206 (void *)(u64
)partid
);
1208 dev_err(xpc_chan
, "can't register NOTIFY IRQ handler, "
1209 "errno=%d\n", -ret
);
1210 retval
= xpLackOfResources
;
1214 /* Setup a timer to check for dropped notify IRQs */
1215 timer
= &part_sn2
->dropped_notify_IRQ_timer
;
1218 (void (*)(unsigned long))xpc_check_for_dropped_notify_IRQ_sn2
;
1219 timer
->data
= (unsigned long)part
;
1220 timer
->expires
= jiffies
+ XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL
;
1223 part
->nchannels
= XPC_MAX_NCHANNELS
;
1225 atomic_set(&part
->nchannels_active
, 0);
1226 atomic_set(&part
->nchannels_engaged
, 0);
1228 for (ch_number
= 0; ch_number
< part
->nchannels
; ch_number
++) {
1229 ch
= &part
->channels
[ch_number
];
1231 ch
->partid
= partid
;
1232 ch
->number
= ch_number
;
1233 ch
->flags
= XPC_C_DISCONNECTED
;
1235 ch
->sn
.sn2
.local_GP
= &part_sn2
->local_GPs
[ch_number
];
1236 ch
->local_openclose_args
=
1237 &part
->local_openclose_args
[ch_number
];
1239 atomic_set(&ch
->kthreads_assigned
, 0);
1240 atomic_set(&ch
->kthreads_idle
, 0);
1241 atomic_set(&ch
->kthreads_active
, 0);
1243 atomic_set(&ch
->references
, 0);
1244 atomic_set(&ch
->n_to_notify
, 0);
1246 spin_lock_init(&ch
->lock
);
1247 mutex_init(&ch
->sn
.sn2
.msg_to_pull_mutex
);
1248 init_completion(&ch
->wdisconnect_wait
);
1250 atomic_set(&ch
->n_on_msg_allocate_wq
, 0);
1251 init_waitqueue_head(&ch
->msg_allocate_wq
);
1252 init_waitqueue_head(&ch
->idle_wq
);
1256 * With the setting of the partition setup_state to XPC_P_SETUP, we're
1257 * declaring that this partition is ready to go.
1259 part
->setup_state
= XPC_P_SETUP
;
1262 * Setup the per partition specific variables required by the
1263 * remote partition to establish channel connections with us.
1265 * The setting of the magic # indicates that these per partition
1266 * specific variables are ready to be used.
1268 xpc_vars_part_sn2
[partid
].GPs_pa
= __pa(part_sn2
->local_GPs
);
1269 xpc_vars_part_sn2
[partid
].openclose_args_pa
=
1270 __pa(part
->local_openclose_args
);
1271 xpc_vars_part_sn2
[partid
].chctl_amo_pa
=
1272 __pa(part_sn2
->local_chctl_amo_va
);
1273 cpuid
= raw_smp_processor_id(); /* any CPU in this partition will do */
1274 xpc_vars_part_sn2
[partid
].notify_IRQ_nasid
= cpuid_to_nasid(cpuid
);
1275 xpc_vars_part_sn2
[partid
].notify_IRQ_phys_cpuid
=
1276 cpu_physical_id(cpuid
);
1277 xpc_vars_part_sn2
[partid
].nchannels
= part
->nchannels
;
1278 xpc_vars_part_sn2
[partid
].magic
= XPC_VP_MAGIC1
;
1282 /* setup of infrastructure failed */
1284 kfree(part
->remote_openclose_args_base
);
1285 part
->remote_openclose_args
= NULL
;
1287 kfree(part
->local_openclose_args_base
);
1288 part
->local_openclose_args
= NULL
;
1290 kfree(part_sn2
->remote_GPs_base
);
1291 part_sn2
->remote_GPs
= NULL
;
1293 kfree(part_sn2
->local_GPs_base
);
1294 part_sn2
->local_GPs
= NULL
;
1296 kfree(part
->channels
);
1297 part
->channels
= NULL
;
1302 * Teardown the infrastructure necessary to support XPartition Communication
1303 * between the specified remote partition and the local one.
1306 xpc_teardown_infrastructure_sn2(struct xpc_partition
*part
)
1308 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1309 short partid
= XPC_PARTID(part
);
1312 * We start off by making this partition inaccessible to local
1313 * processes by marking it as no longer setup. Then we make it
1314 * inaccessible to remote processes by clearing the XPC per partition
1315 * specific variable's magic # (which indicates that these variables
1316 * are no longer valid) and by ignoring all XPC notify IRQs sent to
1320 DBUG_ON(atomic_read(&part
->nchannels_engaged
) != 0);
1321 DBUG_ON(atomic_read(&part
->nchannels_active
) != 0);
1322 DBUG_ON(part
->setup_state
!= XPC_P_SETUP
);
1323 part
->setup_state
= XPC_P_WTEARDOWN
;
1325 xpc_vars_part_sn2
[partid
].magic
= 0;
1327 free_irq(SGI_XPC_NOTIFY
, (void *)(u64
)partid
);
1330 * Before proceeding with the teardown we have to wait until all
1331 * existing references cease.
1333 wait_event(part
->teardown_wq
, (atomic_read(&part
->references
) == 0));
1335 /* now we can begin tearing down the infrastructure */
1337 part
->setup_state
= XPC_P_TORNDOWN
;
1339 /* in case we've still got outstanding timers registered... */
1340 del_timer_sync(&part_sn2
->dropped_notify_IRQ_timer
);
1342 kfree(part
->remote_openclose_args_base
);
1343 part
->remote_openclose_args
= NULL
;
1344 kfree(part
->local_openclose_args_base
);
1345 part
->local_openclose_args
= NULL
;
1346 kfree(part_sn2
->remote_GPs_base
);
1347 part_sn2
->remote_GPs
= NULL
;
1348 kfree(part_sn2
->local_GPs_base
);
1349 part_sn2
->local_GPs
= NULL
;
1350 kfree(part
->channels
);
1351 part
->channels
= NULL
;
1352 part_sn2
->local_chctl_amo_va
= NULL
;
1356 * Create a wrapper that hides the underlying mechanism for pulling a cacheline
1357 * (or multiple cachelines) from a remote partition.
1359 * src must be a cacheline aligned physical address on the remote partition.
1360 * dst must be a cacheline aligned virtual address on this partition.
1361 * cnt must be cacheline sized
1363 /* ??? Replace this function by call to xp_remote_memcpy() or bte_copy()? */
1364 static enum xp_retval
1365 xpc_pull_remote_cachelines_sn2(struct xpc_partition
*part
, void *dst
,
1366 const void *src
, size_t cnt
)
1370 DBUG_ON((u64
)src
!= L1_CACHE_ALIGN((u64
)src
));
1371 DBUG_ON((u64
)dst
!= L1_CACHE_ALIGN((u64
)dst
));
1372 DBUG_ON(cnt
!= L1_CACHE_ALIGN(cnt
));
1374 if (part
->act_state
== XPC_P_DEACTIVATING
)
1375 return part
->reason
;
1377 ret
= xp_remote_memcpy(dst
, src
, cnt
);
1378 if (ret
!= xpSuccess
) {
1379 dev_dbg(xpc_chan
, "xp_remote_memcpy() from partition %d failed,"
1380 " ret=%d\n", XPC_PARTID(part
), ret
);
1386 * Pull the remote per partition specific variables from the specified
1389 static enum xp_retval
1390 xpc_pull_remote_vars_part_sn2(struct xpc_partition
*part
)
1392 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1393 u8 buffer
[L1_CACHE_BYTES
* 2];
1394 struct xpc_vars_part_sn2
*pulled_entry_cacheline
=
1395 (struct xpc_vars_part_sn2
*)L1_CACHE_ALIGN((u64
)buffer
);
1396 struct xpc_vars_part_sn2
*pulled_entry
;
1397 u64 remote_entry_cacheline_pa
, remote_entry_pa
;
1398 short partid
= XPC_PARTID(part
);
1401 /* pull the cacheline that contains the variables we're interested in */
1403 DBUG_ON(part_sn2
->remote_vars_part_pa
!=
1404 L1_CACHE_ALIGN(part_sn2
->remote_vars_part_pa
));
1405 DBUG_ON(sizeof(struct xpc_vars_part_sn2
) != L1_CACHE_BYTES
/ 2);
1407 remote_entry_pa
= part_sn2
->remote_vars_part_pa
+
1408 sn_partition_id
* sizeof(struct xpc_vars_part_sn2
);
1410 remote_entry_cacheline_pa
= (remote_entry_pa
& ~(L1_CACHE_BYTES
- 1));
1412 pulled_entry
= (struct xpc_vars_part_sn2
*)((u64
)pulled_entry_cacheline
1413 + (remote_entry_pa
&
1414 (L1_CACHE_BYTES
- 1)));
1416 ret
= xpc_pull_remote_cachelines_sn2(part
, pulled_entry_cacheline
,
1417 (void *)remote_entry_cacheline_pa
,
1419 if (ret
!= xpSuccess
) {
1420 dev_dbg(xpc_chan
, "failed to pull XPC vars_part from "
1421 "partition %d, ret=%d\n", partid
, ret
);
1425 /* see if they've been set up yet */
1427 if (pulled_entry
->magic
!= XPC_VP_MAGIC1
&&
1428 pulled_entry
->magic
!= XPC_VP_MAGIC2
) {
1430 if (pulled_entry
->magic
!= 0) {
1431 dev_dbg(xpc_chan
, "partition %d's XPC vars_part for "
1432 "partition %d has bad magic value (=0x%lx)\n",
1433 partid
, sn_partition_id
, pulled_entry
->magic
);
1437 /* they've not been initialized yet */
1441 if (xpc_vars_part_sn2
[partid
].magic
== XPC_VP_MAGIC1
) {
1443 /* validate the variables */
1445 if (pulled_entry
->GPs_pa
== 0 ||
1446 pulled_entry
->openclose_args_pa
== 0 ||
1447 pulled_entry
->chctl_amo_pa
== 0) {
1449 dev_err(xpc_chan
, "partition %d's XPC vars_part for "
1450 "partition %d are not valid\n", partid
,
1452 return xpInvalidAddress
;
1455 /* the variables we imported look to be valid */
1457 part_sn2
->remote_GPs_pa
= pulled_entry
->GPs_pa
;
1458 part_sn2
->remote_openclose_args_pa
=
1459 pulled_entry
->openclose_args_pa
;
1460 part_sn2
->remote_chctl_amo_va
=
1461 (struct amo
*)__va(pulled_entry
->chctl_amo_pa
);
1462 part_sn2
->notify_IRQ_nasid
= pulled_entry
->notify_IRQ_nasid
;
1463 part_sn2
->notify_IRQ_phys_cpuid
=
1464 pulled_entry
->notify_IRQ_phys_cpuid
;
1466 if (part
->nchannels
> pulled_entry
->nchannels
)
1467 part
->nchannels
= pulled_entry
->nchannels
;
1469 /* let the other side know that we've pulled their variables */
1471 xpc_vars_part_sn2
[partid
].magic
= XPC_VP_MAGIC2
;
1474 if (pulled_entry
->magic
== XPC_VP_MAGIC1
)
1481 * Establish first contact with the remote partititon. This involves pulling
1482 * the XPC per partition variables from the remote partition and waiting for
1483 * the remote partition to pull ours.
1485 static enum xp_retval
1486 xpc_make_first_contact_sn2(struct xpc_partition
*part
)
1488 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1492 * Register the remote partition's amos with SAL so it can handle
1493 * and cleanup errors within that address range should the remote
1494 * partition go down. We don't unregister this range because it is
1495 * difficult to tell when outstanding writes to the remote partition
1496 * are finished and thus when it is safe to unregister. This should
1497 * not result in wasted space in the SAL xp_addr_region table because
1498 * we should get the same page for remote_amos_page_pa after module
1499 * reloads and system reboots.
1501 if (sn_register_xp_addr_region(part_sn2
->remote_amos_page_pa
,
1502 PAGE_SIZE
, 1) < 0) {
1503 dev_warn(xpc_part
, "xpc_activating(%d) failed to register "
1504 "xp_addr region\n", XPC_PARTID(part
));
1506 ret
= xpPhysAddrRegFailed
;
1507 XPC_DEACTIVATE_PARTITION(part
, ret
);
1512 * Send activate IRQ to get other side to activate if they've not
1513 * already begun to do so.
1515 xpc_send_activate_IRQ_sn2(part_sn2
->remote_amos_page_pa
,
1516 cnodeid_to_nasid(0),
1517 part_sn2
->activate_IRQ_nasid
,
1518 part_sn2
->activate_IRQ_phys_cpuid
);
1520 while ((ret
= xpc_pull_remote_vars_part_sn2(part
)) != xpSuccess
) {
1521 if (ret
!= xpRetry
) {
1522 XPC_DEACTIVATE_PARTITION(part
, ret
);
1526 dev_dbg(xpc_part
, "waiting to make first contact with "
1527 "partition %d\n", XPC_PARTID(part
));
1529 /* wait a 1/4 of a second or so */
1530 (void)msleep_interruptible(250);
1532 if (part
->act_state
== XPC_P_DEACTIVATING
)
1533 return part
->reason
;
1540 * Get the chctl flags and pull the openclose args and/or remote GPs as needed.
1543 xpc_get_chctl_all_flags_sn2(struct xpc_partition
*part
)
1545 struct xpc_partition_sn2
*part_sn2
= &part
->sn
.sn2
;
1546 unsigned long irq_flags
;
1547 union xpc_channel_ctl_flags chctl
;
1551 * See if there are any chctl flags to be handled.
1554 spin_lock_irqsave(&part
->chctl_lock
, irq_flags
);
1555 chctl
= part
->chctl
;
1556 if (chctl
.all_flags
!= 0)
1557 part
->chctl
.all_flags
= 0;
1559 spin_unlock_irqrestore(&part
->chctl_lock
, irq_flags
);
1561 if (xpc_any_openclose_chctl_flags_set(&chctl
)) {
1562 ret
= xpc_pull_remote_cachelines_sn2(part
, part
->
1563 remote_openclose_args
,
1565 remote_openclose_args_pa
,
1566 XPC_OPENCLOSE_ARGS_SIZE
);
1567 if (ret
!= xpSuccess
) {
1568 XPC_DEACTIVATE_PARTITION(part
, ret
);
1570 dev_dbg(xpc_chan
, "failed to pull openclose args from "
1571 "partition %d, ret=%d\n", XPC_PARTID(part
),
1574 /* don't bother processing chctl flags anymore */
1575 chctl
.all_flags
= 0;
1579 if (xpc_any_msg_chctl_flags_set(&chctl
)) {
1580 ret
= xpc_pull_remote_cachelines_sn2(part
, part_sn2
->remote_GPs
,
1581 (void *)part_sn2
->remote_GPs_pa
,
1583 if (ret
!= xpSuccess
) {
1584 XPC_DEACTIVATE_PARTITION(part
, ret
);
1586 dev_dbg(xpc_chan
, "failed to pull GPs from partition "
1587 "%d, ret=%d\n", XPC_PARTID(part
), ret
);
1589 /* don't bother processing chctl flags anymore */
1590 chctl
.all_flags
= 0;
1594 return chctl
.all_flags
;
1598 * Allocate the local message queue and the notify queue.
1600 static enum xp_retval
1601 xpc_allocate_local_msgqueue_sn2(struct xpc_channel
*ch
)
1603 unsigned long irq_flags
;
1607 for (nentries
= ch
->local_nentries
; nentries
> 0; nentries
--) {
1609 nbytes
= nentries
* ch
->msg_size
;
1610 ch
->local_msgqueue
=
1611 xpc_kzalloc_cacheline_aligned_sn2(nbytes
, GFP_KERNEL
,
1612 &ch
->local_msgqueue_base
);
1613 if (ch
->local_msgqueue
== NULL
)
1616 nbytes
= nentries
* sizeof(struct xpc_notify
);
1617 ch
->notify_queue
= kzalloc(nbytes
, GFP_KERNEL
);
1618 if (ch
->notify_queue
== NULL
) {
1619 kfree(ch
->local_msgqueue_base
);
1620 ch
->local_msgqueue
= NULL
;
1624 spin_lock_irqsave(&ch
->lock
, irq_flags
);
1625 if (nentries
< ch
->local_nentries
) {
1626 dev_dbg(xpc_chan
, "nentries=%d local_nentries=%d, "
1627 "partid=%d, channel=%d\n", nentries
,
1628 ch
->local_nentries
, ch
->partid
, ch
->number
);
1630 ch
->local_nentries
= nentries
;
1632 spin_unlock_irqrestore(&ch
->lock
, irq_flags
);
1636 dev_dbg(xpc_chan
, "can't get memory for local message queue and notify "
1637 "queue, partid=%d, channel=%d\n", ch
->partid
, ch
->number
);
1642 * Allocate the cached remote message queue.
1644 static enum xp_retval
1645 xpc_allocate_remote_msgqueue_sn2(struct xpc_channel
*ch
)
1647 unsigned long irq_flags
;
1651 DBUG_ON(ch
->remote_nentries
<= 0);
1653 for (nentries
= ch
->remote_nentries
; nentries
> 0; nentries
--) {
1655 nbytes
= nentries
* ch
->msg_size
;
1656 ch
->remote_msgqueue
=
1657 xpc_kzalloc_cacheline_aligned_sn2(nbytes
, GFP_KERNEL
,
1658 &ch
->remote_msgqueue_base
);
1659 if (ch
->remote_msgqueue
== NULL
)
1662 spin_lock_irqsave(&ch
->lock
, irq_flags
);
1663 if (nentries
< ch
->remote_nentries
) {
1664 dev_dbg(xpc_chan
, "nentries=%d remote_nentries=%d, "
1665 "partid=%d, channel=%d\n", nentries
,
1666 ch
->remote_nentries
, ch
->partid
, ch
->number
);
1668 ch
->remote_nentries
= nentries
;
1670 spin_unlock_irqrestore(&ch
->lock
, irq_flags
);
1674 dev_dbg(xpc_chan
, "can't get memory for cached remote message queue, "
1675 "partid=%d, channel=%d\n", ch
->partid
, ch
->number
);
1680 * Allocate message queues and other stuff associated with a channel.
1682 * Note: Assumes all of the channel sizes are filled in.
1684 static enum xp_retval
1685 xpc_allocate_msgqueues_sn2(struct xpc_channel
*ch
)
1689 DBUG_ON(ch
->flags
& XPC_C_SETUP
);
1691 ret
= xpc_allocate_local_msgqueue_sn2(ch
);
1692 if (ret
== xpSuccess
) {
1694 ret
= xpc_allocate_remote_msgqueue_sn2(ch
);
1695 if (ret
!= xpSuccess
) {
1696 kfree(ch
->local_msgqueue_base
);
1697 ch
->local_msgqueue
= NULL
;
1698 kfree(ch
->notify_queue
);
1699 ch
->notify_queue
= NULL
;
1706 * Free up message queues and other stuff that were allocated for the specified
1709 * Note: ch->reason and ch->reason_line are left set for debugging purposes,
1710 * they're cleared when XPC_C_DISCONNECTED is cleared.
1713 xpc_free_msgqueues_sn2(struct xpc_channel
*ch
)
1715 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1717 DBUG_ON(!spin_is_locked(&ch
->lock
));
1718 DBUG_ON(atomic_read(&ch
->n_to_notify
) != 0);
1720 ch
->remote_msgqueue_pa
= 0;
1724 ch
->local_nentries
= 0;
1725 ch
->remote_nentries
= 0;
1726 ch
->kthreads_assigned_limit
= 0;
1727 ch
->kthreads_idle_limit
= 0;
1729 ch_sn2
->local_GP
->get
= 0;
1730 ch_sn2
->local_GP
->put
= 0;
1731 ch_sn2
->remote_GP
.get
= 0;
1732 ch_sn2
->remote_GP
.put
= 0;
1733 ch_sn2
->w_local_GP
.get
= 0;
1734 ch_sn2
->w_local_GP
.put
= 0;
1735 ch_sn2
->w_remote_GP
.get
= 0;
1736 ch_sn2
->w_remote_GP
.put
= 0;
1737 ch_sn2
->next_msg_to_pull
= 0;
1739 if (ch
->flags
& XPC_C_SETUP
) {
1740 dev_dbg(xpc_chan
, "ch->flags=0x%x, partid=%d, channel=%d\n",
1741 ch
->flags
, ch
->partid
, ch
->number
);
1743 kfree(ch
->local_msgqueue_base
);
1744 ch
->local_msgqueue
= NULL
;
1745 kfree(ch
->remote_msgqueue_base
);
1746 ch
->remote_msgqueue
= NULL
;
1747 kfree(ch
->notify_queue
);
1748 ch
->notify_queue
= NULL
;
1753 * Notify those who wanted to be notified upon delivery of their message.
1756 xpc_notify_senders_sn2(struct xpc_channel
*ch
, enum xp_retval reason
, s64 put
)
1758 struct xpc_notify
*notify
;
1760 s64 get
= ch
->sn
.sn2
.w_remote_GP
.get
- 1;
1762 while (++get
< put
&& atomic_read(&ch
->n_to_notify
) > 0) {
1764 notify
= &ch
->notify_queue
[get
% ch
->local_nentries
];
1767 * See if the notify entry indicates it was associated with
1768 * a message who's sender wants to be notified. It is possible
1769 * that it is, but someone else is doing or has done the
1772 notify_type
= notify
->type
;
1773 if (notify_type
== 0 ||
1774 cmpxchg(¬ify
->type
, notify_type
, 0) != notify_type
) {
1778 DBUG_ON(notify_type
!= XPC_N_CALL
);
1780 atomic_dec(&ch
->n_to_notify
);
1782 if (notify
->func
!= NULL
) {
1783 dev_dbg(xpc_chan
, "notify->func() called, notify=0x%p, "
1784 "msg_number=%ld, partid=%d, channel=%d\n",
1785 (void *)notify
, get
, ch
->partid
, ch
->number
);
1787 notify
->func(reason
, ch
->partid
, ch
->number
,
1790 dev_dbg(xpc_chan
, "notify->func() returned, "
1791 "notify=0x%p, msg_number=%ld, partid=%d, "
1792 "channel=%d\n", (void *)notify
, get
,
1793 ch
->partid
, ch
->number
);
1799 xpc_notify_senders_of_disconnect_sn2(struct xpc_channel
*ch
)
1801 xpc_notify_senders_sn2(ch
, ch
->reason
, ch
->sn
.sn2
.w_local_GP
.put
);
1805 * Clear some of the msg flags in the local message queue.
1808 xpc_clear_local_msgqueue_flags_sn2(struct xpc_channel
*ch
)
1810 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1811 struct xpc_msg
*msg
;
1814 get
= ch_sn2
->w_remote_GP
.get
;
1816 msg
= (struct xpc_msg
*)((u64
)ch
->local_msgqueue
+
1817 (get
% ch
->local_nentries
) *
1820 } while (++get
< ch_sn2
->remote_GP
.get
);
1824 * Clear some of the msg flags in the remote message queue.
1827 xpc_clear_remote_msgqueue_flags_sn2(struct xpc_channel
*ch
)
1829 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1830 struct xpc_msg
*msg
;
1833 put
= ch_sn2
->w_remote_GP
.put
;
1835 msg
= (struct xpc_msg
*)((u64
)ch
->remote_msgqueue
+
1836 (put
% ch
->remote_nentries
) *
1839 } while (++put
< ch_sn2
->remote_GP
.put
);
1843 xpc_process_msg_chctl_flags_sn2(struct xpc_partition
*part
, int ch_number
)
1845 struct xpc_channel
*ch
= &part
->channels
[ch_number
];
1846 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1849 ch_sn2
->remote_GP
= part
->sn
.sn2
.remote_GPs
[ch_number
];
1851 /* See what, if anything, has changed for each connected channel */
1853 xpc_msgqueue_ref(ch
);
1855 if (ch_sn2
->w_remote_GP
.get
== ch_sn2
->remote_GP
.get
&&
1856 ch_sn2
->w_remote_GP
.put
== ch_sn2
->remote_GP
.put
) {
1857 /* nothing changed since GPs were last pulled */
1858 xpc_msgqueue_deref(ch
);
1862 if (!(ch
->flags
& XPC_C_CONNECTED
)) {
1863 xpc_msgqueue_deref(ch
);
1868 * First check to see if messages recently sent by us have been
1869 * received by the other side. (The remote GET value will have
1870 * changed since we last looked at it.)
1873 if (ch_sn2
->w_remote_GP
.get
!= ch_sn2
->remote_GP
.get
) {
1876 * We need to notify any senders that want to be notified
1877 * that their sent messages have been received by their
1878 * intended recipients. We need to do this before updating
1879 * w_remote_GP.get so that we don't allocate the same message
1880 * queue entries prematurely (see xpc_allocate_msg()).
1882 if (atomic_read(&ch
->n_to_notify
) > 0) {
1884 * Notify senders that messages sent have been
1885 * received and delivered by the other side.
1887 xpc_notify_senders_sn2(ch
, xpMsgDelivered
,
1888 ch_sn2
->remote_GP
.get
);
1892 * Clear msg->flags in previously sent messages, so that
1893 * they're ready for xpc_allocate_msg().
1895 xpc_clear_local_msgqueue_flags_sn2(ch
);
1897 ch_sn2
->w_remote_GP
.get
= ch_sn2
->remote_GP
.get
;
1899 dev_dbg(xpc_chan
, "w_remote_GP.get changed to %ld, partid=%d, "
1900 "channel=%d\n", ch_sn2
->w_remote_GP
.get
, ch
->partid
,
1904 * If anyone was waiting for message queue entries to become
1905 * available, wake them up.
1907 if (atomic_read(&ch
->n_on_msg_allocate_wq
) > 0)
1908 wake_up(&ch
->msg_allocate_wq
);
1912 * Now check for newly sent messages by the other side. (The remote
1913 * PUT value will have changed since we last looked at it.)
1916 if (ch_sn2
->w_remote_GP
.put
!= ch_sn2
->remote_GP
.put
) {
1918 * Clear msg->flags in previously received messages, so that
1919 * they're ready for xpc_get_deliverable_msg().
1921 xpc_clear_remote_msgqueue_flags_sn2(ch
);
1923 ch_sn2
->w_remote_GP
.put
= ch_sn2
->remote_GP
.put
;
1925 dev_dbg(xpc_chan
, "w_remote_GP.put changed to %ld, partid=%d, "
1926 "channel=%d\n", ch_sn2
->w_remote_GP
.put
, ch
->partid
,
1929 nmsgs_sent
= ch_sn2
->w_remote_GP
.put
- ch_sn2
->w_local_GP
.get
;
1930 if (nmsgs_sent
> 0) {
1931 dev_dbg(xpc_chan
, "msgs waiting to be copied and "
1932 "delivered=%d, partid=%d, channel=%d\n",
1933 nmsgs_sent
, ch
->partid
, ch
->number
);
1935 if (ch
->flags
& XPC_C_CONNECTEDCALLOUT_MADE
)
1936 xpc_activate_kthreads(ch
, nmsgs_sent
);
1940 xpc_msgqueue_deref(ch
);
1943 static struct xpc_msg
*
1944 xpc_pull_remote_msg_sn2(struct xpc_channel
*ch
, s64 get
)
1946 struct xpc_partition
*part
= &xpc_partitions
[ch
->partid
];
1947 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
1948 struct xpc_msg
*remote_msg
, *msg
;
1949 u32 msg_index
, nmsgs
;
1953 if (mutex_lock_interruptible(&ch_sn2
->msg_to_pull_mutex
) != 0) {
1954 /* we were interrupted by a signal */
1958 while (get
>= ch_sn2
->next_msg_to_pull
) {
1960 /* pull as many messages as are ready and able to be pulled */
1962 msg_index
= ch_sn2
->next_msg_to_pull
% ch
->remote_nentries
;
1964 DBUG_ON(ch_sn2
->next_msg_to_pull
>= ch_sn2
->w_remote_GP
.put
);
1965 nmsgs
= ch_sn2
->w_remote_GP
.put
- ch_sn2
->next_msg_to_pull
;
1966 if (msg_index
+ nmsgs
> ch
->remote_nentries
) {
1967 /* ignore the ones that wrap the msg queue for now */
1968 nmsgs
= ch
->remote_nentries
- msg_index
;
1971 msg_offset
= msg_index
* ch
->msg_size
;
1972 msg
= (struct xpc_msg
*)((u64
)ch
->remote_msgqueue
+ msg_offset
);
1973 remote_msg
= (struct xpc_msg
*)(ch
->remote_msgqueue_pa
+
1976 ret
= xpc_pull_remote_cachelines_sn2(part
, msg
, remote_msg
,
1977 nmsgs
* ch
->msg_size
);
1978 if (ret
!= xpSuccess
) {
1980 dev_dbg(xpc_chan
, "failed to pull %d msgs starting with"
1981 " msg %ld from partition %d, channel=%d, "
1982 "ret=%d\n", nmsgs
, ch_sn2
->next_msg_to_pull
,
1983 ch
->partid
, ch
->number
, ret
);
1985 XPC_DEACTIVATE_PARTITION(part
, ret
);
1987 mutex_unlock(&ch_sn2
->msg_to_pull_mutex
);
1991 ch_sn2
->next_msg_to_pull
+= nmsgs
;
1994 mutex_unlock(&ch_sn2
->msg_to_pull_mutex
);
1996 /* return the message we were looking for */
1997 msg_offset
= (get
% ch
->remote_nentries
) * ch
->msg_size
;
1998 msg
= (struct xpc_msg
*)((u64
)ch
->remote_msgqueue
+ msg_offset
);
2004 xpc_n_of_deliverable_msgs_sn2(struct xpc_channel
*ch
)
2006 return ch
->sn
.sn2
.w_remote_GP
.put
- ch
->sn
.sn2
.w_local_GP
.get
;
2010 * Get a message to be delivered.
2012 static struct xpc_msg
*
2013 xpc_get_deliverable_msg_sn2(struct xpc_channel
*ch
)
2015 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
2016 struct xpc_msg
*msg
= NULL
;
2020 if (ch
->flags
& XPC_C_DISCONNECTING
)
2023 get
= ch_sn2
->w_local_GP
.get
;
2024 rmb(); /* guarantee that .get loads before .put */
2025 if (get
== ch_sn2
->w_remote_GP
.put
)
2028 /* There are messages waiting to be pulled and delivered.
2029 * We need to try to secure one for ourselves. We'll do this
2030 * by trying to increment w_local_GP.get and hope that no one
2031 * else beats us to it. If they do, we'll we'll simply have
2032 * to try again for the next one.
2035 if (cmpxchg(&ch_sn2
->w_local_GP
.get
, get
, get
+ 1) == get
) {
2036 /* we got the entry referenced by get */
2038 dev_dbg(xpc_chan
, "w_local_GP.get changed to %ld, "
2039 "partid=%d, channel=%d\n", get
+ 1,
2040 ch
->partid
, ch
->number
);
2042 /* pull the message from the remote partition */
2044 msg
= xpc_pull_remote_msg_sn2(ch
, get
);
2046 DBUG_ON(msg
!= NULL
&& msg
->number
!= get
);
2047 DBUG_ON(msg
!= NULL
&& (msg
->flags
& XPC_M_DONE
));
2048 DBUG_ON(msg
!= NULL
&& !(msg
->flags
& XPC_M_READY
));
2059 * Now we actually send the messages that are ready to be sent by advancing
2060 * the local message queue's Put value and then send a chctl msgrequest to the
2061 * recipient partition.
2064 xpc_send_msgs_sn2(struct xpc_channel
*ch
, s64 initial_put
)
2066 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
2067 struct xpc_msg
*msg
;
2068 s64 put
= initial_put
+ 1;
2069 int send_msgrequest
= 0;
2074 if (put
== ch_sn2
->w_local_GP
.put
)
2077 msg
= (struct xpc_msg
*)((u64
)ch
->local_msgqueue
+
2078 (put
% ch
->local_nentries
) *
2081 if (!(msg
->flags
& XPC_M_READY
))
2087 if (put
== initial_put
) {
2088 /* nothing's changed */
2092 if (cmpxchg_rel(&ch_sn2
->local_GP
->put
, initial_put
, put
) !=
2094 /* someone else beat us to it */
2095 DBUG_ON(ch_sn2
->local_GP
->put
< initial_put
);
2099 /* we just set the new value of local_GP->put */
2101 dev_dbg(xpc_chan
, "local_GP->put changed to %ld, partid=%d, "
2102 "channel=%d\n", put
, ch
->partid
, ch
->number
);
2104 send_msgrequest
= 1;
2107 * We need to ensure that the message referenced by
2108 * local_GP->put is not XPC_M_READY or that local_GP->put
2109 * equals w_local_GP.put, so we'll go have a look.
2114 if (send_msgrequest
)
2115 xpc_send_chctl_msgrequest_sn2(ch
);
2119 * Allocate an entry for a message from the message queue associated with the
2120 * specified channel.
2122 static enum xp_retval
2123 xpc_allocate_msg_sn2(struct xpc_channel
*ch
, u32 flags
,
2124 struct xpc_msg
**address_of_msg
)
2126 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
2127 struct xpc_msg
*msg
;
2132 * Get the next available message entry from the local message queue.
2133 * If none are available, we'll make sure that we grab the latest
2140 put
= ch_sn2
->w_local_GP
.put
;
2141 rmb(); /* guarantee that .put loads before .get */
2142 if (put
- ch_sn2
->w_remote_GP
.get
< ch
->local_nentries
) {
2144 /* There are available message entries. We need to try
2145 * to secure one for ourselves. We'll do this by trying
2146 * to increment w_local_GP.put as long as someone else
2147 * doesn't beat us to it. If they do, we'll have to
2150 if (cmpxchg(&ch_sn2
->w_local_GP
.put
, put
, put
+ 1) ==
2152 /* we got the entry referenced by put */
2155 continue; /* try again */
2159 * There aren't any available msg entries at this time.
2161 * In waiting for a message entry to become available,
2162 * we set a timeout in case the other side is not sending
2163 * completion interrupts. This lets us fake a notify IRQ
2164 * that will cause the notify IRQ handler to fetch the latest
2165 * GP values as if an interrupt was sent by the other side.
2167 if (ret
== xpTimeout
)
2168 xpc_send_chctl_local_msgrequest_sn2(ch
);
2170 if (flags
& XPC_NOWAIT
)
2173 ret
= xpc_allocate_msg_wait(ch
);
2174 if (ret
!= xpInterrupted
&& ret
!= xpTimeout
)
2178 /* get the message's address and initialize it */
2179 msg
= (struct xpc_msg
*)((u64
)ch
->local_msgqueue
+
2180 (put
% ch
->local_nentries
) * ch
->msg_size
);
2182 DBUG_ON(msg
->flags
!= 0);
2185 dev_dbg(xpc_chan
, "w_local_GP.put changed to %ld; msg=0x%p, "
2186 "msg_number=%ld, partid=%d, channel=%d\n", put
+ 1,
2187 (void *)msg
, msg
->number
, ch
->partid
, ch
->number
);
2189 *address_of_msg
= msg
;
2194 * Common code that does the actual sending of the message by advancing the
2195 * local message queue's Put value and sends a chctl msgrequest to the
2196 * partition the message is being sent to.
2198 static enum xp_retval
2199 xpc_send_msg_sn2(struct xpc_channel
*ch
, u32 flags
, void *payload
,
2200 u16 payload_size
, u8 notify_type
, xpc_notify_func func
,
2203 enum xp_retval ret
= xpSuccess
;
2204 struct xpc_msg
*msg
= msg
;
2205 struct xpc_notify
*notify
= notify
;
2209 DBUG_ON(notify_type
== XPC_N_CALL
&& func
== NULL
);
2211 if (XPC_MSG_SIZE(payload_size
) > ch
->msg_size
)
2212 return xpPayloadTooBig
;
2214 xpc_msgqueue_ref(ch
);
2216 if (ch
->flags
& XPC_C_DISCONNECTING
) {
2220 if (!(ch
->flags
& XPC_C_CONNECTED
)) {
2221 ret
= xpNotConnected
;
2225 ret
= xpc_allocate_msg_sn2(ch
, flags
, &msg
);
2226 if (ret
!= xpSuccess
)
2229 msg_number
= msg
->number
;
2231 if (notify_type
!= 0) {
2233 * Tell the remote side to send an ACK interrupt when the
2234 * message has been delivered.
2236 msg
->flags
|= XPC_M_INTERRUPT
;
2238 atomic_inc(&ch
->n_to_notify
);
2240 notify
= &ch
->notify_queue
[msg_number
% ch
->local_nentries
];
2241 notify
->func
= func
;
2243 notify
->type
= notify_type
;
2245 /* ??? Is a mb() needed here? */
2247 if (ch
->flags
& XPC_C_DISCONNECTING
) {
2249 * An error occurred between our last error check and
2250 * this one. We will try to clear the type field from
2251 * the notify entry. If we succeed then
2252 * xpc_disconnect_channel() didn't already process
2255 if (cmpxchg(¬ify
->type
, notify_type
, 0) ==
2257 atomic_dec(&ch
->n_to_notify
);
2264 memcpy(&msg
->payload
, payload
, payload_size
);
2266 msg
->flags
|= XPC_M_READY
;
2269 * The preceding store of msg->flags must occur before the following
2270 * load of local_GP->put.
2274 /* see if the message is next in line to be sent, if so send it */
2276 put
= ch
->sn
.sn2
.local_GP
->put
;
2277 if (put
== msg_number
)
2278 xpc_send_msgs_sn2(ch
, put
);
2281 xpc_msgqueue_deref(ch
);
2286 * Now we actually acknowledge the messages that have been delivered and ack'd
2287 * by advancing the cached remote message queue's Get value and if requested
2288 * send a chctl msgrequest to the message sender's partition.
2291 xpc_acknowledge_msgs_sn2(struct xpc_channel
*ch
, s64 initial_get
, u8 msg_flags
)
2293 struct xpc_channel_sn2
*ch_sn2
= &ch
->sn
.sn2
;
2294 struct xpc_msg
*msg
;
2295 s64 get
= initial_get
+ 1;
2296 int send_msgrequest
= 0;
2301 if (get
== ch_sn2
->w_local_GP
.get
)
2304 msg
= (struct xpc_msg
*)((u64
)ch
->remote_msgqueue
+
2305 (get
% ch
->remote_nentries
) *
2308 if (!(msg
->flags
& XPC_M_DONE
))
2311 msg_flags
|= msg
->flags
;
2315 if (get
== initial_get
) {
2316 /* nothing's changed */
2320 if (cmpxchg_rel(&ch_sn2
->local_GP
->get
, initial_get
, get
) !=
2322 /* someone else beat us to it */
2323 DBUG_ON(ch_sn2
->local_GP
->get
<= initial_get
);
2327 /* we just set the new value of local_GP->get */
2329 dev_dbg(xpc_chan
, "local_GP->get changed to %ld, partid=%d, "
2330 "channel=%d\n", get
, ch
->partid
, ch
->number
);
2332 send_msgrequest
= (msg_flags
& XPC_M_INTERRUPT
);
2335 * We need to ensure that the message referenced by
2336 * local_GP->get is not XPC_M_DONE or that local_GP->get
2337 * equals w_local_GP.get, so we'll go have a look.
2342 if (send_msgrequest
)
2343 xpc_send_chctl_msgrequest_sn2(ch
);
2347 xpc_received_msg_sn2(struct xpc_channel
*ch
, struct xpc_msg
*msg
)
2350 s64 msg_number
= msg
->number
;
2352 dev_dbg(xpc_chan
, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n",
2353 (void *)msg
, msg_number
, ch
->partid
, ch
->number
);
2355 DBUG_ON((((u64
)msg
- (u64
)ch
->remote_msgqueue
) / ch
->msg_size
) !=
2356 msg_number
% ch
->remote_nentries
);
2357 DBUG_ON(msg
->flags
& XPC_M_DONE
);
2359 msg
->flags
|= XPC_M_DONE
;
2362 * The preceding store of msg->flags must occur before the following
2363 * load of local_GP->get.
2368 * See if this message is next in line to be acknowledged as having
2371 get
= ch
->sn
.sn2
.local_GP
->get
;
2372 if (get
== msg_number
)
2373 xpc_acknowledge_msgs_sn2(ch
, get
, msg
->flags
);
2382 xpc_rsvd_page_init
= xpc_rsvd_page_init_sn2
;
2383 xpc_increment_heartbeat
= xpc_increment_heartbeat_sn2
;
2384 xpc_offline_heartbeat
= xpc_offline_heartbeat_sn2
;
2385 xpc_online_heartbeat
= xpc_online_heartbeat_sn2
;
2386 xpc_heartbeat_init
= xpc_heartbeat_init_sn2
;
2387 xpc_heartbeat_exit
= xpc_heartbeat_exit_sn2
;
2388 xpc_check_remote_hb
= xpc_check_remote_hb_sn2
;
2390 xpc_request_partition_activation
= xpc_request_partition_activation_sn2
;
2391 xpc_request_partition_reactivation
=
2392 xpc_request_partition_reactivation_sn2
;
2393 xpc_request_partition_deactivation
=
2394 xpc_request_partition_deactivation_sn2
;
2395 xpc_cancel_partition_deactivation_request
=
2396 xpc_cancel_partition_deactivation_request_sn2
;
2398 xpc_process_activate_IRQ_rcvd
= xpc_process_activate_IRQ_rcvd_sn2
;
2399 xpc_setup_infrastructure
= xpc_setup_infrastructure_sn2
;
2400 xpc_teardown_infrastructure
= xpc_teardown_infrastructure_sn2
;
2401 xpc_make_first_contact
= xpc_make_first_contact_sn2
;
2402 xpc_get_chctl_all_flags
= xpc_get_chctl_all_flags_sn2
;
2403 xpc_allocate_msgqueues
= xpc_allocate_msgqueues_sn2
;
2404 xpc_free_msgqueues
= xpc_free_msgqueues_sn2
;
2405 xpc_notify_senders_of_disconnect
= xpc_notify_senders_of_disconnect_sn2
;
2406 xpc_process_msg_chctl_flags
= xpc_process_msg_chctl_flags_sn2
;
2407 xpc_n_of_deliverable_msgs
= xpc_n_of_deliverable_msgs_sn2
;
2408 xpc_get_deliverable_msg
= xpc_get_deliverable_msg_sn2
;
2410 xpc_indicate_partition_engaged
= xpc_indicate_partition_engaged_sn2
;
2411 xpc_partition_engaged
= xpc_partition_engaged_sn2
;
2412 xpc_any_partition_engaged
= xpc_any_partition_engaged_sn2
;
2413 xpc_indicate_partition_disengaged
=
2414 xpc_indicate_partition_disengaged_sn2
;
2415 xpc_assume_partition_disengaged
= xpc_assume_partition_disengaged_sn2
;
2417 xpc_send_chctl_closerequest
= xpc_send_chctl_closerequest_sn2
;
2418 xpc_send_chctl_closereply
= xpc_send_chctl_closereply_sn2
;
2419 xpc_send_chctl_openrequest
= xpc_send_chctl_openrequest_sn2
;
2420 xpc_send_chctl_openreply
= xpc_send_chctl_openreply_sn2
;
2422 xpc_send_msg
= xpc_send_msg_sn2
;
2423 xpc_received_msg
= xpc_received_msg_sn2
;
2425 buf_size
= max(XPC_RP_VARS_SIZE
,
2426 XPC_RP_HEADER_SIZE
+ XP_NASID_MASK_BYTES_SN2
);
2427 xpc_remote_copy_buffer_sn2
= xpc_kmalloc_cacheline_aligned(buf_size
,
2429 &xpc_remote_copy_buffer_base_sn2
);
2430 if (xpc_remote_copy_buffer_sn2
== NULL
) {
2431 dev_err(xpc_part
, "can't get memory for remote copy buffer\n");
2435 /* open up protections for IPI and [potentially] amo operations */
2436 xpc_allow_IPI_ops_sn2();
2437 xpc_allow_amo_ops_shub_wars_1_1_sn2();
2440 * This is safe to do before the xpc_hb_checker thread has started
2441 * because the handler releases a wait queue. If an interrupt is
2442 * received before the thread is waiting, it will not go to sleep,
2443 * but rather immediately process the interrupt.
2445 ret
= request_irq(SGI_XPC_ACTIVATE
, xpc_handle_activate_IRQ_sn2
, 0,
2448 dev_err(xpc_part
, "can't register ACTIVATE IRQ handler, "
2449 "errno=%d\n", -ret
);
2450 xpc_disallow_IPI_ops_sn2();
2451 kfree(xpc_remote_copy_buffer_base_sn2
);
2459 free_irq(SGI_XPC_ACTIVATE
, NULL
);
2460 xpc_disallow_IPI_ops_sn2();
2461 kfree(xpc_remote_copy_buffer_base_sn2
);