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-rw-r--r--drivers/misc/sgi-xp/xpc_uv.c1443
1 files changed, 1443 insertions, 0 deletions
diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
new file mode 100644
index 000000000000..1ac694c01623
--- /dev/null
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -0,0 +1,1443 @@
1/*
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
4 * for more details.
5 *
6 * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
7 */
8
9/*
10 * Cross Partition Communication (XPC) uv-based functions.
11 *
12 * Architecture specific implementation of common functions.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/interrupt.h>
19#include <linux/delay.h>
20#include <linux/device.h>
21#include <asm/uv/uv_hub.h>
22#include "../sgi-gru/gru.h"
23#include "../sgi-gru/grukservices.h"
24#include "xpc.h"
25
26static atomic64_t xpc_heartbeat_uv;
27static DECLARE_BITMAP(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_UV);
28
29#define XPC_ACTIVATE_MSG_SIZE_UV (1 * GRU_CACHE_LINE_BYTES)
30#define XPC_NOTIFY_MSG_SIZE_UV (2 * GRU_CACHE_LINE_BYTES)
31
32#define XPC_ACTIVATE_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
33 XPC_ACTIVATE_MSG_SIZE_UV)
34#define XPC_NOTIFY_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
35 XPC_NOTIFY_MSG_SIZE_UV)
36
37static void *xpc_activate_mq_uv;
38static void *xpc_notify_mq_uv;
39
40static int
41xpc_setup_partitions_sn_uv(void)
42{
43 short partid;
44 struct xpc_partition_uv *part_uv;
45
46 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
47 part_uv = &xpc_partitions[partid].sn.uv;
48
49 spin_lock_init(&part_uv->flags_lock);
50 part_uv->remote_act_state = XPC_P_AS_INACTIVE;
51 }
52 return 0;
53}
54
55static void *
56xpc_create_gru_mq_uv(unsigned int mq_size, int cpuid, unsigned int irq,
57 irq_handler_t irq_handler)
58{
59 int ret;
60 int nid;
61 int mq_order;
62 struct page *page;
63 void *mq;
64
65 nid = cpu_to_node(cpuid);
66 mq_order = get_order(mq_size);
67 page = alloc_pages_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
68 mq_order);
69 if (page == NULL) {
70 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
71 "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
72 return NULL;
73 }
74
75 mq = page_address(page);
76 ret = gru_create_message_queue(mq, mq_size);
77 if (ret != 0) {
78 dev_err(xpc_part, "gru_create_message_queue() returned "
79 "error=%d\n", ret);
80 free_pages((unsigned long)mq, mq_order);
81 return NULL;
82 }
83
84 /* !!! Need to do some other things to set up IRQ */
85
86 ret = request_irq(irq, irq_handler, 0, "xpc", NULL);
87 if (ret != 0) {
88 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
89 irq, ret);
90 free_pages((unsigned long)mq, mq_order);
91 return NULL;
92 }
93
94 /* !!! enable generation of irq when GRU mq op occurs to this mq */
95
96 /* ??? allow other partitions to access GRU mq? */
97
98 return mq;
99}
100
101static void
102xpc_destroy_gru_mq_uv(void *mq, unsigned int mq_size, unsigned int irq)
103{
104 /* ??? disallow other partitions to access GRU mq? */
105
106 /* !!! disable generation of irq when GRU mq op occurs to this mq */
107
108 free_irq(irq, NULL);
109
110 free_pages((unsigned long)mq, get_order(mq_size));
111}
112
113static enum xp_retval
114xpc_send_gru_msg(unsigned long mq_gpa, void *msg, size_t msg_size)
115{
116 enum xp_retval xp_ret;
117 int ret;
118
119 while (1) {
120 ret = gru_send_message_gpa(mq_gpa, msg, msg_size);
121 if (ret == MQE_OK) {
122 xp_ret = xpSuccess;
123 break;
124 }
125
126 if (ret == MQE_QUEUE_FULL) {
127 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
128 "error=MQE_QUEUE_FULL\n");
129 /* !!! handle QLimit reached; delay & try again */
130 /* ??? Do we add a limit to the number of retries? */
131 (void)msleep_interruptible(10);
132 } else if (ret == MQE_CONGESTION) {
133 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
134 "error=MQE_CONGESTION\n");
135 /* !!! handle LB Overflow; simply try again */
136 /* ??? Do we add a limit to the number of retries? */
137 } else {
138 /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
139 dev_err(xpc_chan, "gru_send_message_gpa() returned "
140 "error=%d\n", ret);
141 xp_ret = xpGruSendMqError;
142 break;
143 }
144 }
145 return xp_ret;
146}
147
148static void
149xpc_process_activate_IRQ_rcvd_uv(void)
150{
151 unsigned long irq_flags;
152 short partid;
153 struct xpc_partition *part;
154 u8 act_state_req;
155
156 DBUG_ON(xpc_activate_IRQ_rcvd == 0);
157
158 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
159 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
160 part = &xpc_partitions[partid];
161
162 if (part->sn.uv.act_state_req == 0)
163 continue;
164
165 xpc_activate_IRQ_rcvd--;
166 BUG_ON(xpc_activate_IRQ_rcvd < 0);
167
168 act_state_req = part->sn.uv.act_state_req;
169 part->sn.uv.act_state_req = 0;
170 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
171
172 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
173 if (part->act_state == XPC_P_AS_INACTIVE)
174 xpc_activate_partition(part);
175 else if (part->act_state == XPC_P_AS_DEACTIVATING)
176 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
177
178 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
179 if (part->act_state == XPC_P_AS_INACTIVE)
180 xpc_activate_partition(part);
181 else
182 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
183
184 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
185 XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
186
187 } else {
188 BUG();
189 }
190
191 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
192 if (xpc_activate_IRQ_rcvd == 0)
193 break;
194 }
195 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
196
197}
198
199static void
200xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
201 struct xpc_activate_mq_msghdr_uv *msg_hdr,
202 int *wakeup_hb_checker)
203{
204 unsigned long irq_flags;
205 struct xpc_partition_uv *part_uv = &part->sn.uv;
206 struct xpc_openclose_args *args;
207
208 part_uv->remote_act_state = msg_hdr->act_state;
209
210 switch (msg_hdr->type) {
211 case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
212 /* syncing of remote_act_state was just done above */
213 break;
214
215 case XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV: {
216 struct xpc_activate_mq_msg_heartbeat_req_uv *msg;
217
218 msg = container_of(msg_hdr,
219 struct xpc_activate_mq_msg_heartbeat_req_uv,
220 hdr);
221 part_uv->heartbeat = msg->heartbeat;
222 break;
223 }
224 case XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV: {
225 struct xpc_activate_mq_msg_heartbeat_req_uv *msg;
226
227 msg = container_of(msg_hdr,
228 struct xpc_activate_mq_msg_heartbeat_req_uv,
229 hdr);
230 part_uv->heartbeat = msg->heartbeat;
231
232 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
233 part_uv->flags |= XPC_P_HEARTBEAT_OFFLINE_UV;
234 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
235 break;
236 }
237 case XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV: {
238 struct xpc_activate_mq_msg_heartbeat_req_uv *msg;
239
240 msg = container_of(msg_hdr,
241 struct xpc_activate_mq_msg_heartbeat_req_uv,
242 hdr);
243 part_uv->heartbeat = msg->heartbeat;
244
245 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
246 part_uv->flags &= ~XPC_P_HEARTBEAT_OFFLINE_UV;
247 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
248 break;
249 }
250 case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
251 struct xpc_activate_mq_msg_activate_req_uv *msg;
252
253 /*
254 * ??? Do we deal here with ts_jiffies being different
255 * ??? if act_state != XPC_P_AS_INACTIVE instead of
256 * ??? below?
257 */
258 msg = container_of(msg_hdr, struct
259 xpc_activate_mq_msg_activate_req_uv, hdr);
260
261 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
262 if (part_uv->act_state_req == 0)
263 xpc_activate_IRQ_rcvd++;
264 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
265 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
266 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
267 part_uv->remote_activate_mq_gpa = msg->activate_mq_gpa;
268 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
269
270 (*wakeup_hb_checker)++;
271 break;
272 }
273 case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
274 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
275
276 msg = container_of(msg_hdr, struct
277 xpc_activate_mq_msg_deactivate_req_uv, hdr);
278
279 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
280 if (part_uv->act_state_req == 0)
281 xpc_activate_IRQ_rcvd++;
282 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
283 part_uv->reason = msg->reason;
284 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
285
286 (*wakeup_hb_checker)++;
287 return;
288 }
289 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
290 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
291
292 msg = container_of(msg_hdr, struct
293 xpc_activate_mq_msg_chctl_closerequest_uv,
294 hdr);
295 args = &part->remote_openclose_args[msg->ch_number];
296 args->reason = msg->reason;
297
298 spin_lock_irqsave(&part->chctl_lock, irq_flags);
299 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
300 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
301
302 xpc_wakeup_channel_mgr(part);
303 break;
304 }
305 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
306 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
307
308 msg = container_of(msg_hdr, struct
309 xpc_activate_mq_msg_chctl_closereply_uv,
310 hdr);
311
312 spin_lock_irqsave(&part->chctl_lock, irq_flags);
313 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
314 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
315
316 xpc_wakeup_channel_mgr(part);
317 break;
318 }
319 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
320 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
321
322 msg = container_of(msg_hdr, struct
323 xpc_activate_mq_msg_chctl_openrequest_uv,
324 hdr);
325 args = &part->remote_openclose_args[msg->ch_number];
326 args->entry_size = msg->entry_size;
327 args->local_nentries = msg->local_nentries;
328
329 spin_lock_irqsave(&part->chctl_lock, irq_flags);
330 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
331 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
332
333 xpc_wakeup_channel_mgr(part);
334 break;
335 }
336 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
337 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
338
339 msg = container_of(msg_hdr, struct
340 xpc_activate_mq_msg_chctl_openreply_uv, hdr);
341 args = &part->remote_openclose_args[msg->ch_number];
342 args->remote_nentries = msg->remote_nentries;
343 args->local_nentries = msg->local_nentries;
344 args->local_msgqueue_pa = msg->local_notify_mq_gpa;
345
346 spin_lock_irqsave(&part->chctl_lock, irq_flags);
347 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
348 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
349
350 xpc_wakeup_channel_mgr(part);
351 break;
352 }
353 case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
354 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
355 part_uv->flags |= XPC_P_ENGAGED_UV;
356 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
357 break;
358
359 case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
360 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
361 part_uv->flags &= ~XPC_P_ENGAGED_UV;
362 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
363 break;
364
365 default:
366 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
367 "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
368
369 /* get hb checker to deactivate from the remote partition */
370 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
371 if (part_uv->act_state_req == 0)
372 xpc_activate_IRQ_rcvd++;
373 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
374 part_uv->reason = xpBadMsgType;
375 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
376
377 (*wakeup_hb_checker)++;
378 return;
379 }
380
381 if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
382 part->remote_rp_ts_jiffies != 0) {
383 /*
384 * ??? Does what we do here need to be sensitive to
385 * ??? act_state or remote_act_state?
386 */
387 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
388 if (part_uv->act_state_req == 0)
389 xpc_activate_IRQ_rcvd++;
390 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
391 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
392
393 (*wakeup_hb_checker)++;
394 }
395}
396
397static irqreturn_t
398xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
399{
400 struct xpc_activate_mq_msghdr_uv *msg_hdr;
401 short partid;
402 struct xpc_partition *part;
403 int wakeup_hb_checker = 0;
404
405 while ((msg_hdr = gru_get_next_message(xpc_activate_mq_uv)) != NULL) {
406
407 partid = msg_hdr->partid;
408 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
409 dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
410 "received invalid partid=0x%x in message\n",
411 partid);
412 } else {
413 part = &xpc_partitions[partid];
414 if (xpc_part_ref(part)) {
415 xpc_handle_activate_mq_msg_uv(part, msg_hdr,
416 &wakeup_hb_checker);
417 xpc_part_deref(part);
418 }
419 }
420
421 gru_free_message(xpc_activate_mq_uv, msg_hdr);
422 }
423
424 if (wakeup_hb_checker)
425 wake_up_interruptible(&xpc_activate_IRQ_wq);
426
427 return IRQ_HANDLED;
428}
429
430static enum xp_retval
431xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
432 int msg_type)
433{
434 struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
435
436 DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
437
438 msg_hdr->type = msg_type;
439 msg_hdr->partid = XPC_PARTID(part);
440 msg_hdr->act_state = part->act_state;
441 msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
442
443 /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
444 return xpc_send_gru_msg(part->sn.uv.remote_activate_mq_gpa, msg,
445 msg_size);
446}
447
448static void
449xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
450 size_t msg_size, int msg_type)
451{
452 enum xp_retval ret;
453
454 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
455 if (unlikely(ret != xpSuccess))
456 XPC_DEACTIVATE_PARTITION(part, ret);
457}
458
459static void
460xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
461 void *msg, size_t msg_size, int msg_type)
462{
463 struct xpc_partition *part = &xpc_partitions[ch->number];
464 enum xp_retval ret;
465
466 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
467 if (unlikely(ret != xpSuccess)) {
468 if (irq_flags != NULL)
469 spin_unlock_irqrestore(&ch->lock, *irq_flags);
470
471 XPC_DEACTIVATE_PARTITION(part, ret);
472
473 if (irq_flags != NULL)
474 spin_lock_irqsave(&ch->lock, *irq_flags);
475 }
476}
477
478static void
479xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
480{
481 unsigned long irq_flags;
482 struct xpc_partition_uv *part_uv = &part->sn.uv;
483
484 /*
485 * !!! Make our side think that the remote parition sent an activate
486 * !!! message our way by doing what the activate IRQ handler would
487 * !!! do had one really been sent.
488 */
489
490 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
491 if (part_uv->act_state_req == 0)
492 xpc_activate_IRQ_rcvd++;
493 part_uv->act_state_req = act_state_req;
494 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
495
496 wake_up_interruptible(&xpc_activate_IRQ_wq);
497}
498
499static enum xp_retval
500xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
501 size_t *len)
502{
503 /* !!! call the UV version of sn_partition_reserved_page_pa() */
504 return xpUnsupported;
505}
506
507static int
508xpc_setup_rsvd_page_sn_uv(struct xpc_rsvd_page *rp)
509{
510 rp->sn.activate_mq_gpa = uv_gpa(xpc_activate_mq_uv);
511 return 0;
512}
513
514static void
515xpc_send_heartbeat_uv(int msg_type)
516{
517 short partid;
518 struct xpc_partition *part;
519 struct xpc_activate_mq_msg_heartbeat_req_uv msg;
520
521 /*
522 * !!! On uv we're broadcasting a heartbeat message every 5 seconds.
523 * !!! Whereas on sn2 we're bte_copy'ng the heartbeat info every 20
524 * !!! seconds. This is an increase in numalink traffic.
525 * ??? Is this good?
526 */
527
528 msg.heartbeat = atomic64_inc_return(&xpc_heartbeat_uv);
529
530 partid = find_first_bit(xpc_heartbeating_to_mask_uv,
531 XP_MAX_NPARTITIONS_UV);
532
533 while (partid < XP_MAX_NPARTITIONS_UV) {
534 part = &xpc_partitions[partid];
535
536 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
537 msg_type);
538
539 partid = find_next_bit(xpc_heartbeating_to_mask_uv,
540 XP_MAX_NPARTITIONS_UV, partid + 1);
541 }
542}
543
544static void
545xpc_increment_heartbeat_uv(void)
546{
547 xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV);
548}
549
550static void
551xpc_offline_heartbeat_uv(void)
552{
553 xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV);
554}
555
556static void
557xpc_online_heartbeat_uv(void)
558{
559 xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV);
560}
561
562static void
563xpc_heartbeat_init_uv(void)
564{
565 atomic64_set(&xpc_heartbeat_uv, 0);
566 bitmap_zero(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_UV);
567 xpc_heartbeating_to_mask = &xpc_heartbeating_to_mask_uv[0];
568}
569
570static void
571xpc_heartbeat_exit_uv(void)
572{
573 xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV);
574}
575
576static enum xp_retval
577xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
578{
579 struct xpc_partition_uv *part_uv = &part->sn.uv;
580 enum xp_retval ret = xpNoHeartbeat;
581
582 if (part_uv->remote_act_state != XPC_P_AS_INACTIVE &&
583 part_uv->remote_act_state != XPC_P_AS_DEACTIVATING) {
584
585 if (part_uv->heartbeat != part->last_heartbeat ||
586 (part_uv->flags & XPC_P_HEARTBEAT_OFFLINE_UV)) {
587
588 part->last_heartbeat = part_uv->heartbeat;
589 ret = xpSuccess;
590 }
591 }
592 return ret;
593}
594
595static void
596xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
597 unsigned long remote_rp_gpa, int nasid)
598{
599 short partid = remote_rp->SAL_partid;
600 struct xpc_partition *part = &xpc_partitions[partid];
601 struct xpc_activate_mq_msg_activate_req_uv msg;
602
603 part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
604 part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
605 part->sn.uv.remote_activate_mq_gpa = remote_rp->sn.activate_mq_gpa;
606
607 /*
608 * ??? Is it a good idea to make this conditional on what is
609 * ??? potentially stale state information?
610 */
611 if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
612 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
613 msg.activate_mq_gpa = xpc_rsvd_page->sn.activate_mq_gpa;
614 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
615 XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
616 }
617
618 if (part->act_state == XPC_P_AS_INACTIVE)
619 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
620}
621
622static void
623xpc_request_partition_reactivation_uv(struct xpc_partition *part)
624{
625 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
626}
627
628static void
629xpc_request_partition_deactivation_uv(struct xpc_partition *part)
630{
631 struct xpc_activate_mq_msg_deactivate_req_uv msg;
632
633 /*
634 * ??? Is it a good idea to make this conditional on what is
635 * ??? potentially stale state information?
636 */
637 if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
638 part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
639
640 msg.reason = part->reason;
641 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
642 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
643 }
644}
645
646static void
647xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
648{
649 /* nothing needs to be done */
650 return;
651}
652
653static void
654xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
655{
656 head->first = NULL;
657 head->last = NULL;
658 spin_lock_init(&head->lock);
659 head->n_entries = 0;
660}
661
662static void *
663xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
664{
665 unsigned long irq_flags;
666 struct xpc_fifo_entry_uv *first;
667
668 spin_lock_irqsave(&head->lock, irq_flags);
669 first = head->first;
670 if (head->first != NULL) {
671 head->first = first->next;
672 if (head->first == NULL)
673 head->last = NULL;
674 }
675 head->n_entries++;
676 spin_unlock_irqrestore(&head->lock, irq_flags);
677 first->next = NULL;
678 return first;
679}
680
681static void
682xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
683 struct xpc_fifo_entry_uv *last)
684{
685 unsigned long irq_flags;
686
687 last->next = NULL;
688 spin_lock_irqsave(&head->lock, irq_flags);
689 if (head->last != NULL)
690 head->last->next = last;
691 else
692 head->first = last;
693 head->last = last;
694 head->n_entries--;
695 BUG_ON(head->n_entries < 0);
696 spin_unlock_irqrestore(&head->lock, irq_flags);
697}
698
699static int
700xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
701{
702 return head->n_entries;
703}
704
705/*
706 * Setup the channel structures that are uv specific.
707 */
708static enum xp_retval
709xpc_setup_ch_structures_sn_uv(struct xpc_partition *part)
710{
711 struct xpc_channel_uv *ch_uv;
712 int ch_number;
713
714 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
715 ch_uv = &part->channels[ch_number].sn.uv;
716
717 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
718 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
719 }
720
721 return xpSuccess;
722}
723
724/*
725 * Teardown the channel structures that are uv specific.
726 */
727static void
728xpc_teardown_ch_structures_sn_uv(struct xpc_partition *part)
729{
730 /* nothing needs to be done */
731 return;
732}
733
734static enum xp_retval
735xpc_make_first_contact_uv(struct xpc_partition *part)
736{
737 struct xpc_activate_mq_msg_uv msg;
738
739 /*
740 * We send a sync msg to get the remote partition's remote_act_state
741 * updated to our current act_state which at this point should
742 * be XPC_P_AS_ACTIVATING.
743 */
744 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
745 XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
746
747 while (part->sn.uv.remote_act_state != XPC_P_AS_ACTIVATING) {
748
749 dev_dbg(xpc_part, "waiting to make first contact with "
750 "partition %d\n", XPC_PARTID(part));
751
752 /* wait a 1/4 of a second or so */
753 (void)msleep_interruptible(250);
754
755 if (part->act_state == XPC_P_AS_DEACTIVATING)
756 return part->reason;
757 }
758
759 return xpSuccess;
760}
761
762static u64
763xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
764{
765 unsigned long irq_flags;
766 union xpc_channel_ctl_flags chctl;
767
768 spin_lock_irqsave(&part->chctl_lock, irq_flags);
769 chctl = part->chctl;
770 if (chctl.all_flags != 0)
771 part->chctl.all_flags = 0;
772
773 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
774 return chctl.all_flags;
775}
776
777static enum xp_retval
778xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
779{
780 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
781 struct xpc_send_msg_slot_uv *msg_slot;
782 unsigned long irq_flags;
783 int nentries;
784 int entry;
785 size_t nbytes;
786
787 for (nentries = ch->local_nentries; nentries > 0; nentries--) {
788 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
789 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
790 if (ch_uv->send_msg_slots == NULL)
791 continue;
792
793 for (entry = 0; entry < nentries; entry++) {
794 msg_slot = &ch_uv->send_msg_slots[entry];
795
796 msg_slot->msg_slot_number = entry;
797 xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
798 &msg_slot->next);
799 }
800
801 spin_lock_irqsave(&ch->lock, irq_flags);
802 if (nentries < ch->local_nentries)
803 ch->local_nentries = nentries;
804 spin_unlock_irqrestore(&ch->lock, irq_flags);
805 return xpSuccess;
806 }
807
808 return xpNoMemory;
809}
810
811static enum xp_retval
812xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
813{
814 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
815 struct xpc_notify_mq_msg_uv *msg_slot;
816 unsigned long irq_flags;
817 int nentries;
818 int entry;
819 size_t nbytes;
820
821 for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
822 nbytes = nentries * ch->entry_size;
823 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
824 if (ch_uv->recv_msg_slots == NULL)
825 continue;
826
827 for (entry = 0; entry < nentries; entry++) {
828 msg_slot = ch_uv->recv_msg_slots + entry *
829 ch->entry_size;
830
831 msg_slot->hdr.msg_slot_number = entry;
832 }
833
834 spin_lock_irqsave(&ch->lock, irq_flags);
835 if (nentries < ch->remote_nentries)
836 ch->remote_nentries = nentries;
837 spin_unlock_irqrestore(&ch->lock, irq_flags);
838 return xpSuccess;
839 }
840
841 return xpNoMemory;
842}
843
844/*
845 * Allocate msg_slots associated with the channel.
846 */
847static enum xp_retval
848xpc_setup_msg_structures_uv(struct xpc_channel *ch)
849{
850 static enum xp_retval ret;
851 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
852
853 DBUG_ON(ch->flags & XPC_C_SETUP);
854
855 ret = xpc_allocate_send_msg_slot_uv(ch);
856 if (ret == xpSuccess) {
857
858 ret = xpc_allocate_recv_msg_slot_uv(ch);
859 if (ret != xpSuccess) {
860 kfree(ch_uv->send_msg_slots);
861 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
862 }
863 }
864 return ret;
865}
866
867/*
868 * Free up msg_slots and clear other stuff that were setup for the specified
869 * channel.
870 */
871static void
872xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
873{
874 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
875
876 DBUG_ON(!spin_is_locked(&ch->lock));
877
878 ch_uv->remote_notify_mq_gpa = 0;
879
880 if (ch->flags & XPC_C_SETUP) {
881 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
882 kfree(ch_uv->send_msg_slots);
883 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
884 kfree(ch_uv->recv_msg_slots);
885 }
886}
887
888static void
889xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
890{
891 struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
892
893 msg.ch_number = ch->number;
894 msg.reason = ch->reason;
895 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
896 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
897}
898
899static void
900xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
901{
902 struct xpc_activate_mq_msg_chctl_closereply_uv msg;
903
904 msg.ch_number = ch->number;
905 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
906 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
907}
908
909static void
910xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
911{
912 struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
913
914 msg.ch_number = ch->number;
915 msg.entry_size = ch->entry_size;
916 msg.local_nentries = ch->local_nentries;
917 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
918 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
919}
920
921static void
922xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
923{
924 struct xpc_activate_mq_msg_chctl_openreply_uv msg;
925
926 msg.ch_number = ch->number;
927 msg.local_nentries = ch->local_nentries;
928 msg.remote_nentries = ch->remote_nentries;
929 msg.local_notify_mq_gpa = uv_gpa(xpc_notify_mq_uv);
930 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
931 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
932}
933
934static void
935xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
936{
937 unsigned long irq_flags;
938
939 spin_lock_irqsave(&part->chctl_lock, irq_flags);
940 part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
941 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
942
943 xpc_wakeup_channel_mgr(part);
944}
945
946static void
947xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
948 unsigned long msgqueue_pa)
949{
950 ch->sn.uv.remote_notify_mq_gpa = msgqueue_pa;
951}
952
953static void
954xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
955{
956 struct xpc_activate_mq_msg_uv msg;
957
958 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
959 XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
960}
961
962static void
963xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
964{
965 struct xpc_activate_mq_msg_uv msg;
966
967 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
968 XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
969}
970
971static void
972xpc_assume_partition_disengaged_uv(short partid)
973{
974 struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
975 unsigned long irq_flags;
976
977 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
978 part_uv->flags &= ~XPC_P_ENGAGED_UV;
979 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
980}
981
982static int
983xpc_partition_engaged_uv(short partid)
984{
985 return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
986}
987
988static int
989xpc_any_partition_engaged_uv(void)
990{
991 struct xpc_partition_uv *part_uv;
992 short partid;
993
994 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
995 part_uv = &xpc_partitions[partid].sn.uv;
996 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
997 return 1;
998 }
999 return 0;
1000}
1001
1002static enum xp_retval
1003xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1004 struct xpc_send_msg_slot_uv **address_of_msg_slot)
1005{
1006 enum xp_retval ret;
1007 struct xpc_send_msg_slot_uv *msg_slot;
1008 struct xpc_fifo_entry_uv *entry;
1009
1010 while (1) {
1011 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1012 if (entry != NULL)
1013 break;
1014
1015 if (flags & XPC_NOWAIT)
1016 return xpNoWait;
1017
1018 ret = xpc_allocate_msg_wait(ch);
1019 if (ret != xpInterrupted && ret != xpTimeout)
1020 return ret;
1021 }
1022
1023 msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1024 *address_of_msg_slot = msg_slot;
1025 return xpSuccess;
1026}
1027
1028static void
1029xpc_free_msg_slot_uv(struct xpc_channel *ch,
1030 struct xpc_send_msg_slot_uv *msg_slot)
1031{
1032 xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1033
1034 /* wakeup anyone waiting for a free msg slot */
1035 if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1036 wake_up(&ch->msg_allocate_wq);
1037}
1038
1039static void
1040xpc_notify_sender_uv(struct xpc_channel *ch,
1041 struct xpc_send_msg_slot_uv *msg_slot,
1042 enum xp_retval reason)
1043{
1044 xpc_notify_func func = msg_slot->func;
1045
1046 if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1047
1048 atomic_dec(&ch->n_to_notify);
1049
1050 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1051 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1052 msg_slot->msg_slot_number, ch->partid, ch->number);
1053
1054 func(reason, ch->partid, ch->number, msg_slot->key);
1055
1056 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1057 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1058 msg_slot->msg_slot_number, ch->partid, ch->number);
1059 }
1060}
1061
1062static void
1063xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1064 struct xpc_notify_mq_msg_uv *msg)
1065{
1066 struct xpc_send_msg_slot_uv *msg_slot;
1067 int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1068
1069 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1070
1071 BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1072 msg_slot->msg_slot_number += ch->local_nentries;
1073
1074 if (msg_slot->func != NULL)
1075 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1076
1077 xpc_free_msg_slot_uv(ch, msg_slot);
1078}
1079
1080static void
1081xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1082 struct xpc_notify_mq_msg_uv *msg)
1083{
1084 struct xpc_partition_uv *part_uv = &part->sn.uv;
1085 struct xpc_channel *ch;
1086 struct xpc_channel_uv *ch_uv;
1087 struct xpc_notify_mq_msg_uv *msg_slot;
1088 unsigned long irq_flags;
1089 int ch_number = msg->hdr.ch_number;
1090
1091 if (unlikely(ch_number >= part->nchannels)) {
1092 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1093 "channel number=0x%x in message from partid=%d\n",
1094 ch_number, XPC_PARTID(part));
1095
1096 /* get hb checker to deactivate from the remote partition */
1097 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1098 if (part_uv->act_state_req == 0)
1099 xpc_activate_IRQ_rcvd++;
1100 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1101 part_uv->reason = xpBadChannelNumber;
1102 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1103
1104 wake_up_interruptible(&xpc_activate_IRQ_wq);
1105 return;
1106 }
1107
1108 ch = &part->channels[ch_number];
1109 xpc_msgqueue_ref(ch);
1110
1111 if (!(ch->flags & XPC_C_CONNECTED)) {
1112 xpc_msgqueue_deref(ch);
1113 return;
1114 }
1115
1116 /* see if we're really dealing with an ACK for a previously sent msg */
1117 if (msg->hdr.size == 0) {
1118 xpc_handle_notify_mq_ack_uv(ch, msg);
1119 xpc_msgqueue_deref(ch);
1120 return;
1121 }
1122
1123 /* we're dealing with a normal message sent via the notify_mq */
1124 ch_uv = &ch->sn.uv;
1125
1126 msg_slot = (struct xpc_notify_mq_msg_uv *)((u64)ch_uv->recv_msg_slots +
1127 (msg->hdr.msg_slot_number % ch->remote_nentries) *
1128 ch->entry_size);
1129
1130 BUG_ON(msg->hdr.msg_slot_number != msg_slot->hdr.msg_slot_number);
1131 BUG_ON(msg_slot->hdr.size != 0);
1132
1133 memcpy(msg_slot, msg, msg->hdr.size);
1134
1135 xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1136
1137 if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1138 /*
1139 * If there is an existing idle kthread get it to deliver
1140 * the payload, otherwise we'll have to get the channel mgr
1141 * for this partition to create a kthread to do the delivery.
1142 */
1143 if (atomic_read(&ch->kthreads_idle) > 0)
1144 wake_up_nr(&ch->idle_wq, 1);
1145 else
1146 xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1147 }
1148 xpc_msgqueue_deref(ch);
1149}
1150
1151static irqreturn_t
1152xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1153{
1154 struct xpc_notify_mq_msg_uv *msg;
1155 short partid;
1156 struct xpc_partition *part;
1157
1158 while ((msg = gru_get_next_message(xpc_notify_mq_uv)) != NULL) {
1159
1160 partid = msg->hdr.partid;
1161 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1162 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1163 "invalid partid=0x%x in message\n", partid);
1164 } else {
1165 part = &xpc_partitions[partid];
1166
1167 if (xpc_part_ref(part)) {
1168 xpc_handle_notify_mq_msg_uv(part, msg);
1169 xpc_part_deref(part);
1170 }
1171 }
1172
1173 gru_free_message(xpc_notify_mq_uv, msg);
1174 }
1175
1176 return IRQ_HANDLED;
1177}
1178
1179static int
1180xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1181{
1182 return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1183}
1184
1185static void
1186xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1187{
1188 struct xpc_channel *ch = &part->channels[ch_number];
1189 int ndeliverable_payloads;
1190
1191 xpc_msgqueue_ref(ch);
1192
1193 ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1194
1195 if (ndeliverable_payloads > 0 &&
1196 (ch->flags & XPC_C_CONNECTED) &&
1197 (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1198
1199 xpc_activate_kthreads(ch, ndeliverable_payloads);
1200 }
1201
1202 xpc_msgqueue_deref(ch);
1203}
1204
1205static enum xp_retval
1206xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1207 u16 payload_size, u8 notify_type, xpc_notify_func func,
1208 void *key)
1209{
1210 enum xp_retval ret = xpSuccess;
1211 struct xpc_send_msg_slot_uv *msg_slot = NULL;
1212 struct xpc_notify_mq_msg_uv *msg;
1213 u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1214 size_t msg_size;
1215
1216 DBUG_ON(notify_type != XPC_N_CALL);
1217
1218 msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1219 if (msg_size > ch->entry_size)
1220 return xpPayloadTooBig;
1221
1222 xpc_msgqueue_ref(ch);
1223
1224 if (ch->flags & XPC_C_DISCONNECTING) {
1225 ret = ch->reason;
1226 goto out_1;
1227 }
1228 if (!(ch->flags & XPC_C_CONNECTED)) {
1229 ret = xpNotConnected;
1230 goto out_1;
1231 }
1232
1233 ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1234 if (ret != xpSuccess)
1235 goto out_1;
1236
1237 if (func != NULL) {
1238 atomic_inc(&ch->n_to_notify);
1239
1240 msg_slot->key = key;
1241 wmb(); /* a non-NULL func must hit memory after the key */
1242 msg_slot->func = func;
1243
1244 if (ch->flags & XPC_C_DISCONNECTING) {
1245 ret = ch->reason;
1246 goto out_2;
1247 }
1248 }
1249
1250 msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1251 msg->hdr.partid = xp_partition_id;
1252 msg->hdr.ch_number = ch->number;
1253 msg->hdr.size = msg_size;
1254 msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1255 memcpy(&msg->payload, payload, payload_size);
1256
1257 ret = xpc_send_gru_msg(ch->sn.uv.remote_notify_mq_gpa, msg, msg_size);
1258 if (ret == xpSuccess)
1259 goto out_1;
1260
1261 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1262out_2:
1263 if (func != NULL) {
1264 /*
1265 * Try to NULL the msg_slot's func field. If we fail, then
1266 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1267 * case we need to pretend we succeeded to send the message
1268 * since the user will get a callout for the disconnect error
1269 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1270 * error returned here will confuse them. Additionally, since
1271 * in this case the channel is being disconnected we don't need
1272 * to put the the msg_slot back on the free list.
1273 */
1274 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1275 ret = xpSuccess;
1276 goto out_1;
1277 }
1278
1279 msg_slot->key = NULL;
1280 atomic_dec(&ch->n_to_notify);
1281 }
1282 xpc_free_msg_slot_uv(ch, msg_slot);
1283out_1:
1284 xpc_msgqueue_deref(ch);
1285 return ret;
1286}
1287
1288/*
1289 * Tell the callers of xpc_send_notify() that the status of their payloads
1290 * is unknown because the channel is now disconnecting.
1291 *
1292 * We don't worry about putting these msg_slots on the free list since the
1293 * msg_slots themselves are about to be kfree'd.
1294 */
1295static void
1296xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1297{
1298 struct xpc_send_msg_slot_uv *msg_slot;
1299 int entry;
1300
1301 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1302
1303 for (entry = 0; entry < ch->local_nentries; entry++) {
1304
1305 if (atomic_read(&ch->n_to_notify) == 0)
1306 break;
1307
1308 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1309 if (msg_slot->func != NULL)
1310 xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1311 }
1312}
1313
1314/*
1315 * Get the next deliverable message's payload.
1316 */
1317static void *
1318xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1319{
1320 struct xpc_fifo_entry_uv *entry;
1321 struct xpc_notify_mq_msg_uv *msg;
1322 void *payload = NULL;
1323
1324 if (!(ch->flags & XPC_C_DISCONNECTING)) {
1325 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1326 if (entry != NULL) {
1327 msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1328 hdr.u.next);
1329 payload = &msg->payload;
1330 }
1331 }
1332 return payload;
1333}
1334
1335static void
1336xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1337{
1338 struct xpc_notify_mq_msg_uv *msg;
1339 enum xp_retval ret;
1340
1341 msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1342
1343 /* return an ACK to the sender of this message */
1344
1345 msg->hdr.partid = xp_partition_id;
1346 msg->hdr.size = 0; /* size of zero indicates this is an ACK */
1347
1348 ret = xpc_send_gru_msg(ch->sn.uv.remote_notify_mq_gpa, msg,
1349 sizeof(struct xpc_notify_mq_msghdr_uv));
1350 if (ret != xpSuccess)
1351 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1352
1353 msg->hdr.msg_slot_number += ch->remote_nentries;
1354}
1355
1356int
1357xpc_init_uv(void)
1358{
1359 xpc_setup_partitions_sn = xpc_setup_partitions_sn_uv;
1360 xpc_process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv;
1361 xpc_get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv;
1362 xpc_setup_rsvd_page_sn = xpc_setup_rsvd_page_sn_uv;
1363 xpc_increment_heartbeat = xpc_increment_heartbeat_uv;
1364 xpc_offline_heartbeat = xpc_offline_heartbeat_uv;
1365 xpc_online_heartbeat = xpc_online_heartbeat_uv;
1366 xpc_heartbeat_init = xpc_heartbeat_init_uv;
1367 xpc_heartbeat_exit = xpc_heartbeat_exit_uv;
1368 xpc_get_remote_heartbeat = xpc_get_remote_heartbeat_uv;
1369
1370 xpc_request_partition_activation = xpc_request_partition_activation_uv;
1371 xpc_request_partition_reactivation =
1372 xpc_request_partition_reactivation_uv;
1373 xpc_request_partition_deactivation =
1374 xpc_request_partition_deactivation_uv;
1375 xpc_cancel_partition_deactivation_request =
1376 xpc_cancel_partition_deactivation_request_uv;
1377
1378 xpc_setup_ch_structures_sn = xpc_setup_ch_structures_sn_uv;
1379 xpc_teardown_ch_structures_sn = xpc_teardown_ch_structures_sn_uv;
1380
1381 xpc_make_first_contact = xpc_make_first_contact_uv;
1382
1383 xpc_get_chctl_all_flags = xpc_get_chctl_all_flags_uv;
1384 xpc_send_chctl_closerequest = xpc_send_chctl_closerequest_uv;
1385 xpc_send_chctl_closereply = xpc_send_chctl_closereply_uv;
1386 xpc_send_chctl_openrequest = xpc_send_chctl_openrequest_uv;
1387 xpc_send_chctl_openreply = xpc_send_chctl_openreply_uv;
1388
1389 xpc_save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv;
1390
1391 xpc_setup_msg_structures = xpc_setup_msg_structures_uv;
1392 xpc_teardown_msg_structures = xpc_teardown_msg_structures_uv;
1393
1394 xpc_indicate_partition_engaged = xpc_indicate_partition_engaged_uv;
1395 xpc_indicate_partition_disengaged =
1396 xpc_indicate_partition_disengaged_uv;
1397 xpc_assume_partition_disengaged = xpc_assume_partition_disengaged_uv;
1398 xpc_partition_engaged = xpc_partition_engaged_uv;
1399 xpc_any_partition_engaged = xpc_any_partition_engaged_uv;
1400
1401 xpc_n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv;
1402 xpc_process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv;
1403 xpc_send_payload = xpc_send_payload_uv;
1404 xpc_notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv;
1405 xpc_get_deliverable_payload = xpc_get_deliverable_payload_uv;
1406 xpc_received_payload = xpc_received_payload_uv;
1407
1408 if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1409 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1410 XPC_MSG_HDR_MAX_SIZE);
1411 return -E2BIG;
1412 }
1413
1414 /* ??? The cpuid argument's value is 0, is that what we want? */
1415 /* !!! The irq argument's value isn't correct. */
1416 xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0, 0,
1417 xpc_handle_activate_IRQ_uv);
1418 if (xpc_activate_mq_uv == NULL)
1419 return -ENOMEM;
1420
1421 /* ??? The cpuid argument's value is 0, is that what we want? */
1422 /* !!! The irq argument's value isn't correct. */
1423 xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0, 0,
1424 xpc_handle_notify_IRQ_uv);
1425 if (xpc_notify_mq_uv == NULL) {
1426 /* !!! The irq argument's value isn't correct. */
1427 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv,
1428 XPC_ACTIVATE_MQ_SIZE_UV, 0);
1429 return -ENOMEM;
1430 }
1431
1432 return 0;
1433}
1434
1435void
1436xpc_exit_uv(void)
1437{
1438 /* !!! The irq argument's value isn't correct. */
1439 xpc_destroy_gru_mq_uv(xpc_notify_mq_uv, XPC_NOTIFY_MQ_SIZE_UV, 0);
1440
1441 /* !!! The irq argument's value isn't correct. */
1442 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv, XPC_ACTIVATE_MQ_SIZE_UV, 0);
1443}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-27 20:16:19 -0500