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Merge remote-tracking branch 'cleancache/linux-next'
[linux-2.6/next.git] / drivers / misc / sgi-xp / xpc_uv.c
blob17bbacb1b4b131b119b0076b339f44012fcc51f7
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) 2008-2009 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 <linux/err.h>
22 #include <linux/slab.h>
23 #include <asm/uv/uv_hub.h>
24 #if defined CONFIG_X86_64
25 #include <asm/uv/bios.h>
26 #include <asm/uv/uv_irq.h>
27 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
28 #include <asm/sn/intr.h>
29 #include <asm/sn/sn_sal.h>
30 #endif
31 #include "../sgi-gru/gru.h"
32 #include "../sgi-gru/grukservices.h"
33 #include "xpc.h"
34
35 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
36 struct uv_IO_APIC_route_entry {
37 __u64 vector : 8,
38 delivery_mode : 3,
39 dest_mode : 1,
40 delivery_status : 1,
41 polarity : 1,
42 __reserved_1 : 1,
43 trigger : 1,
44 mask : 1,
45 __reserved_2 : 15,
46 dest : 32;
47 };
48 #endif
49
50 static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
51
52 #define XPC_ACTIVATE_MSG_SIZE_UV (1 * GRU_CACHE_LINE_BYTES)
53 #define XPC_ACTIVATE_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
54 XPC_ACTIVATE_MSG_SIZE_UV)
55 #define XPC_ACTIVATE_IRQ_NAME "xpc_activate"
56
57 #define XPC_NOTIFY_MSG_SIZE_UV (2 * GRU_CACHE_LINE_BYTES)
58 #define XPC_NOTIFY_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
59 XPC_NOTIFY_MSG_SIZE_UV)
60 #define XPC_NOTIFY_IRQ_NAME "xpc_notify"
61
62 static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
63 static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
64
65 static int
66 xpc_setup_partitions_uv(void)
67 {
68 short partid;
69 struct xpc_partition_uv *part_uv;
70
71 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
72 part_uv = &xpc_partitions[partid].sn.uv;
73
74 mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
75 spin_lock_init(&part_uv->flags_lock);
76 part_uv->remote_act_state = XPC_P_AS_INACTIVE;
77 }
78 return 0;
79 }
80
81 static void
82 xpc_teardown_partitions_uv(void)
83 {
84 short partid;
85 struct xpc_partition_uv *part_uv;
86 unsigned long irq_flags;
87
88 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
89 part_uv = &xpc_partitions[partid].sn.uv;
90
91 if (part_uv->cached_activate_gru_mq_desc != NULL) {
92 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
93 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
94 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
95 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
96 kfree(part_uv->cached_activate_gru_mq_desc);
97 part_uv->cached_activate_gru_mq_desc = NULL;
98 mutex_unlock(&part_uv->
99 cached_activate_gru_mq_desc_mutex);
100 }
101 }
102 }
103
104 static int
105 xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
106 {
107 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
108
109 #if defined CONFIG_X86_64
110 mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
111 UV_AFFINITY_CPU);
112 if (mq->irq < 0) {
113 dev_err(xpc_part, "uv_setup_irq() returned error=%d\n",
114 -mq->irq);
115 return mq->irq;
116 }
117
118 mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
119
120 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
121 if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
122 mq->irq = SGI_XPC_ACTIVATE;
123 else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
124 mq->irq = SGI_XPC_NOTIFY;
125 else
126 return -EINVAL;
127
128 mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
129 uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
130 #else
131 #error not a supported configuration
132 #endif
133
134 return 0;
135 }
136
137 static void
138 xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
139 {
140 #if defined CONFIG_X86_64
141 uv_teardown_irq(mq->irq);
142
143 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
144 int mmr_pnode;
145 unsigned long mmr_value;
146
147 mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
148 mmr_value = 1UL << 16;
149
150 uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
151 #else
152 #error not a supported configuration
153 #endif
154 }
155
156 static int
157 xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
158 {
159 int ret;
160
161 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
162 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
163
164 ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
165 mq->order, &mq->mmr_offset);
166 if (ret < 0) {
167 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
168 ret);
169 return -EBUSY;
170 }
171 #elif defined CONFIG_X86_64
172 ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
173 mq->order, &mq->mmr_offset);
174 if (ret < 0) {
175 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
176 "ret=%d\n", ret);
177 return ret;
178 }
179 #else
180 #error not a supported configuration
181 #endif
182
183 mq->watchlist_num = ret;
184 return 0;
185 }
186
187 static void
188 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
189 {
190 int ret;
191 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
192
193 #if defined CONFIG_X86_64
194 ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
195 BUG_ON(ret != BIOS_STATUS_SUCCESS);
196 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
197 ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
198 BUG_ON(ret != SALRET_OK);
199 #else
200 #error not a supported configuration
201 #endif
202 }
203
204 static struct xpc_gru_mq_uv *
205 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
206 irq_handler_t irq_handler)
207 {
208 enum xp_retval xp_ret;
209 int ret;
210 int nid;
211 int nasid;
212 int pg_order;
213 struct page *page;
214 struct xpc_gru_mq_uv *mq;
215 struct uv_IO_APIC_route_entry *mmr_value;
216
217 mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
218 if (mq == NULL) {
219 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
220 "a xpc_gru_mq_uv structure\n");
221 ret = -ENOMEM;
222 goto out_0;
223 }
224
225 mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
226 GFP_KERNEL);
227 if (mq->gru_mq_desc == NULL) {
228 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
229 "a gru_message_queue_desc structure\n");
230 ret = -ENOMEM;
231 goto out_1;
232 }
233
234 pg_order = get_order(mq_size);
235 mq->order = pg_order + PAGE_SHIFT;
236 mq_size = 1UL << mq->order;
237
238 mq->mmr_blade = uv_cpu_to_blade_id(cpu);
239
240 nid = cpu_to_node(cpu);
241 page = alloc_pages_exact_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
242 pg_order);
243 if (page == NULL) {
244 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
245 "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
246 ret = -ENOMEM;
247 goto out_2;
248 }
249 mq->address = page_address(page);
250
251 /* enable generation of irq when GRU mq operation occurs to this mq */
252 ret = xpc_gru_mq_watchlist_alloc_uv(mq);
253 if (ret != 0)
254 goto out_3;
255
256 ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
257 if (ret != 0)
258 goto out_4;
259
260 ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
261 if (ret != 0) {
262 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
263 mq->irq, -ret);
264 goto out_5;
265 }
266
267 nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
268
269 mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
270 ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
271 nasid, mmr_value->vector, mmr_value->dest);
272 if (ret != 0) {
273 dev_err(xpc_part, "gru_create_message_queue() returned "
274 "error=%d\n", ret);
275 ret = -EINVAL;
276 goto out_6;
277 }
278
279 /* allow other partitions to access this GRU mq */
280 xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
281 if (xp_ret != xpSuccess) {
282 ret = -EACCES;
283 goto out_6;
284 }
285
286 return mq;
287
288 /* something went wrong */
289 out_6:
290 free_irq(mq->irq, NULL);
291 out_5:
292 xpc_release_gru_mq_irq_uv(mq);
293 out_4:
294 xpc_gru_mq_watchlist_free_uv(mq);
295 out_3:
296 free_pages((unsigned long)mq->address, pg_order);
297 out_2:
298 kfree(mq->gru_mq_desc);
299 out_1:
300 kfree(mq);
301 out_0:
302 return ERR_PTR(ret);
303 }
304
305 static void
306 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
307 {
308 unsigned int mq_size;
309 int pg_order;
310 int ret;
311
312 /* disallow other partitions to access GRU mq */
313 mq_size = 1UL << mq->order;
314 ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
315 BUG_ON(ret != xpSuccess);
316
317 /* unregister irq handler and release mq irq/vector mapping */
318 free_irq(mq->irq, NULL);
319 xpc_release_gru_mq_irq_uv(mq);
320
321 /* disable generation of irq when GRU mq op occurs to this mq */
322 xpc_gru_mq_watchlist_free_uv(mq);
323
324 pg_order = mq->order - PAGE_SHIFT;
325 free_pages((unsigned long)mq->address, pg_order);
326
327 kfree(mq);
328 }
329
330 static enum xp_retval
331 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
332 size_t msg_size)
333 {
334 enum xp_retval xp_ret;
335 int ret;
336
337 while (1) {
338 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
339 if (ret == MQE_OK) {
340 xp_ret = xpSuccess;
341 break;
342 }
343
344 if (ret == MQE_QUEUE_FULL) {
345 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
346 "error=MQE_QUEUE_FULL\n");
347 /* !!! handle QLimit reached; delay & try again */
348 /* ??? Do we add a limit to the number of retries? */
349 (void)msleep_interruptible(10);
350 } else if (ret == MQE_CONGESTION) {
351 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
352 "error=MQE_CONGESTION\n");
353 /* !!! handle LB Overflow; simply try again */
354 /* ??? Do we add a limit to the number of retries? */
355 } else {
356 /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
357 dev_err(xpc_chan, "gru_send_message_gpa() returned "
358 "error=%d\n", ret);
359 xp_ret = xpGruSendMqError;
360 break;
361 }
362 }
363 return xp_ret;
364 }
365
366 static void
367 xpc_process_activate_IRQ_rcvd_uv(void)
368 {
369 unsigned long irq_flags;
370 short partid;
371 struct xpc_partition *part;
372 u8 act_state_req;
373
374 DBUG_ON(xpc_activate_IRQ_rcvd == 0);
375
376 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
377 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
378 part = &xpc_partitions[partid];
379
380 if (part->sn.uv.act_state_req == 0)
381 continue;
382
383 xpc_activate_IRQ_rcvd--;
384 BUG_ON(xpc_activate_IRQ_rcvd < 0);
385
386 act_state_req = part->sn.uv.act_state_req;
387 part->sn.uv.act_state_req = 0;
388 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
389
390 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
391 if (part->act_state == XPC_P_AS_INACTIVE)
392 xpc_activate_partition(part);
393 else if (part->act_state == XPC_P_AS_DEACTIVATING)
394 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
395
396 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
397 if (part->act_state == XPC_P_AS_INACTIVE)
398 xpc_activate_partition(part);
399 else
400 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
401
402 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
403 XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
404
405 } else {
406 BUG();
407 }
408
409 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
410 if (xpc_activate_IRQ_rcvd == 0)
411 break;
412 }
413 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
414
415 }
416
417 static void
418 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
419 struct xpc_activate_mq_msghdr_uv *msg_hdr,
420 int part_setup,
421 int *wakeup_hb_checker)
422 {
423 unsigned long irq_flags;
424 struct xpc_partition_uv *part_uv = &part->sn.uv;
425 struct xpc_openclose_args *args;
426
427 part_uv->remote_act_state = msg_hdr->act_state;
428
429 switch (msg_hdr->type) {
430 case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
431 /* syncing of remote_act_state was just done above */
432 break;
433
434 case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
435 struct xpc_activate_mq_msg_activate_req_uv *msg;
436
437 /*
438 * ??? Do we deal here with ts_jiffies being different
439 * ??? if act_state != XPC_P_AS_INACTIVE instead of
440 * ??? below?
441 */
442 msg = container_of(msg_hdr, struct
443 xpc_activate_mq_msg_activate_req_uv, hdr);
444
445 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
446 if (part_uv->act_state_req == 0)
447 xpc_activate_IRQ_rcvd++;
448 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
449 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
450 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
451 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
452
453 if (msg->activate_gru_mq_desc_gpa !=
454 part_uv->activate_gru_mq_desc_gpa) {
455 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
456 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
457 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
458 part_uv->activate_gru_mq_desc_gpa =
459 msg->activate_gru_mq_desc_gpa;
460 }
461 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
462
463 (*wakeup_hb_checker)++;
464 break;
465 }
466 case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
467 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
468
469 msg = container_of(msg_hdr, struct
470 xpc_activate_mq_msg_deactivate_req_uv, hdr);
471
472 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
473 if (part_uv->act_state_req == 0)
474 xpc_activate_IRQ_rcvd++;
475 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
476 part_uv->reason = msg->reason;
477 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
478
479 (*wakeup_hb_checker)++;
480 return;
481 }
482 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
483 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
484
485 if (!part_setup)
486 break;
487
488 msg = container_of(msg_hdr, struct
489 xpc_activate_mq_msg_chctl_closerequest_uv,
490 hdr);
491 args = &part->remote_openclose_args[msg->ch_number];
492 args->reason = msg->reason;
493
494 spin_lock_irqsave(&part->chctl_lock, irq_flags);
495 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
496 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
497
498 xpc_wakeup_channel_mgr(part);
499 break;
500 }
501 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
502 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
503
504 if (!part_setup)
505 break;
506
507 msg = container_of(msg_hdr, struct
508 xpc_activate_mq_msg_chctl_closereply_uv,
509 hdr);
510
511 spin_lock_irqsave(&part->chctl_lock, irq_flags);
512 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
513 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
514
515 xpc_wakeup_channel_mgr(part);
516 break;
517 }
518 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
519 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
520
521 if (!part_setup)
522 break;
523
524 msg = container_of(msg_hdr, struct
525 xpc_activate_mq_msg_chctl_openrequest_uv,
526 hdr);
527 args = &part->remote_openclose_args[msg->ch_number];
528 args->entry_size = msg->entry_size;
529 args->local_nentries = msg->local_nentries;
530
531 spin_lock_irqsave(&part->chctl_lock, irq_flags);
532 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
533 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
534
535 xpc_wakeup_channel_mgr(part);
536 break;
537 }
538 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
539 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
540
541 if (!part_setup)
542 break;
543
544 msg = container_of(msg_hdr, struct
545 xpc_activate_mq_msg_chctl_openreply_uv, hdr);
546 args = &part->remote_openclose_args[msg->ch_number];
547 args->remote_nentries = msg->remote_nentries;
548 args->local_nentries = msg->local_nentries;
549 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
550
551 spin_lock_irqsave(&part->chctl_lock, irq_flags);
552 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
553 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
554
555 xpc_wakeup_channel_mgr(part);
556 break;
557 }
558 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
559 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
560
561 if (!part_setup)
562 break;
563
564 msg = container_of(msg_hdr, struct
565 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
566 spin_lock_irqsave(&part->chctl_lock, irq_flags);
567 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
568 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
569
570 xpc_wakeup_channel_mgr(part);
571 }
572 case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
573 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
574 part_uv->flags |= XPC_P_ENGAGED_UV;
575 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
576 break;
577
578 case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
579 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
580 part_uv->flags &= ~XPC_P_ENGAGED_UV;
581 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
582 break;
583
584 default:
585 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
586 "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
587
588 /* get hb checker to deactivate from the remote partition */
589 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
590 if (part_uv->act_state_req == 0)
591 xpc_activate_IRQ_rcvd++;
592 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
593 part_uv->reason = xpBadMsgType;
594 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
595
596 (*wakeup_hb_checker)++;
597 return;
598 }
599
600 if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
601 part->remote_rp_ts_jiffies != 0) {
602 /*
603 * ??? Does what we do here need to be sensitive to
604 * ??? act_state or remote_act_state?
605 */
606 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
607 if (part_uv->act_state_req == 0)
608 xpc_activate_IRQ_rcvd++;
609 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
610 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
611
612 (*wakeup_hb_checker)++;
613 }
614 }
615
616 static irqreturn_t
617 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
618 {
619 struct xpc_activate_mq_msghdr_uv *msg_hdr;
620 short partid;
621 struct xpc_partition *part;
622 int wakeup_hb_checker = 0;
623 int part_referenced;
624
625 while (1) {
626 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
627 if (msg_hdr == NULL)
628 break;
629
630 partid = msg_hdr->partid;
631 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
632 dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
633 "received invalid partid=0x%x in message\n",
634 partid);
635 } else {
636 part = &xpc_partitions[partid];
637
638 part_referenced = xpc_part_ref(part);
639 xpc_handle_activate_mq_msg_uv(part, msg_hdr,
640 part_referenced,
641 &wakeup_hb_checker);
642 if (part_referenced)
643 xpc_part_deref(part);
644 }
645
646 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
647 }
648
649 if (wakeup_hb_checker)
650 wake_up_interruptible(&xpc_activate_IRQ_wq);
651
652 return IRQ_HANDLED;
653 }
654
655 static enum xp_retval
656 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
657 unsigned long gru_mq_desc_gpa)
658 {
659 enum xp_retval ret;
660
661 ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
662 sizeof(struct gru_message_queue_desc));
663 if (ret == xpSuccess)
664 gru_mq_desc->mq = NULL;
665
666 return ret;
667 }
668
669 static enum xp_retval
670 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
671 int msg_type)
672 {
673 struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
674 struct xpc_partition_uv *part_uv = &part->sn.uv;
675 struct gru_message_queue_desc *gru_mq_desc;
676 unsigned long irq_flags;
677 enum xp_retval ret;
678
679 DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
680
681 msg_hdr->type = msg_type;
682 msg_hdr->partid = xp_partition_id;
683 msg_hdr->act_state = part->act_state;
684 msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
685
686 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
687 again:
688 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
689 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
690 if (gru_mq_desc == NULL) {
691 gru_mq_desc = kmalloc(sizeof(struct
692 gru_message_queue_desc),
693 GFP_KERNEL);
694 if (gru_mq_desc == NULL) {
695 ret = xpNoMemory;
696 goto done;
697 }
698 part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
699 }
700
701 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
702 part_uv->
703 activate_gru_mq_desc_gpa);
704 if (ret != xpSuccess)
705 goto done;
706
707 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
708 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
709 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
710 }
711
712 /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
713 ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
714 msg_size);
715 if (ret != xpSuccess) {
716 smp_rmb(); /* ensure a fresh copy of part_uv->flags */
717 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
718 goto again;
719 }
720 done:
721 mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
722 return ret;
723 }
724
725 static void
726 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
727 size_t msg_size, int msg_type)
728 {
729 enum xp_retval ret;
730
731 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
732 if (unlikely(ret != xpSuccess))
733 XPC_DEACTIVATE_PARTITION(part, ret);
734 }
735
736 static void
737 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
738 void *msg, size_t msg_size, int msg_type)
739 {
740 struct xpc_partition *part = &xpc_partitions[ch->partid];
741 enum xp_retval ret;
742
743 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
744 if (unlikely(ret != xpSuccess)) {
745 if (irq_flags != NULL)
746 spin_unlock_irqrestore(&ch->lock, *irq_flags);
747
748 XPC_DEACTIVATE_PARTITION(part, ret);
749
750 if (irq_flags != NULL)
751 spin_lock_irqsave(&ch->lock, *irq_flags);
752 }
753 }
754
755 static void
756 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
757 {
758 unsigned long irq_flags;
759 struct xpc_partition_uv *part_uv = &part->sn.uv;
760
761 /*
762 * !!! Make our side think that the remote partition sent an activate
763 * !!! mq message our way by doing what the activate IRQ handler would
764 * !!! do had one really been sent.
765 */
766
767 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
768 if (part_uv->act_state_req == 0)
769 xpc_activate_IRQ_rcvd++;
770 part_uv->act_state_req = act_state_req;
771 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
772
773 wake_up_interruptible(&xpc_activate_IRQ_wq);
774 }
775
776 static enum xp_retval
777 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
778 size_t *len)
779 {
780 s64 status;
781 enum xp_retval ret;
782
783 #if defined CONFIG_X86_64
784 status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
785 (u64 *)len);
786 if (status == BIOS_STATUS_SUCCESS)
787 ret = xpSuccess;
788 else if (status == BIOS_STATUS_MORE_PASSES)
789 ret = xpNeedMoreInfo;
790 else
791 ret = xpBiosError;
792
793 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
794 status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
795 if (status == SALRET_OK)
796 ret = xpSuccess;
797 else if (status == SALRET_MORE_PASSES)
798 ret = xpNeedMoreInfo;
799 else
800 ret = xpSalError;
801
802 #else
803 #error not a supported configuration
804 #endif
805
806 return ret;
807 }
808
809 static int
810 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
811 {
812 xpc_heartbeat_uv =
813 &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
814 rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
815 rp->sn.uv.activate_gru_mq_desc_gpa =
816 uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
817 return 0;
818 }
819
820 static void
821 xpc_allow_hb_uv(short partid)
822 {
823 }
824
825 static void
826 xpc_disallow_hb_uv(short partid)
827 {
828 }
829
830 static void
831 xpc_disallow_all_hbs_uv(void)
832 {
833 }
834
835 static void
836 xpc_increment_heartbeat_uv(void)
837 {
838 xpc_heartbeat_uv->value++;
839 }
840
841 static void
842 xpc_offline_heartbeat_uv(void)
843 {
844 xpc_increment_heartbeat_uv();
845 xpc_heartbeat_uv->offline = 1;
846 }
847
848 static void
849 xpc_online_heartbeat_uv(void)
850 {
851 xpc_increment_heartbeat_uv();
852 xpc_heartbeat_uv->offline = 0;
853 }
854
855 static void
856 xpc_heartbeat_init_uv(void)
857 {
858 xpc_heartbeat_uv->value = 1;
859 xpc_heartbeat_uv->offline = 0;
860 }
861
862 static void
863 xpc_heartbeat_exit_uv(void)
864 {
865 xpc_offline_heartbeat_uv();
866 }
867
868 static enum xp_retval
869 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
870 {
871 struct xpc_partition_uv *part_uv = &part->sn.uv;
872 enum xp_retval ret;
873
874 ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
875 part_uv->heartbeat_gpa,
876 sizeof(struct xpc_heartbeat_uv));
877 if (ret != xpSuccess)
878 return ret;
879
880 if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
881 !part_uv->cached_heartbeat.offline) {
882
883 ret = xpNoHeartbeat;
884 } else {
885 part->last_heartbeat = part_uv->cached_heartbeat.value;
886 }
887 return ret;
888 }
889
890 static void
891 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
892 unsigned long remote_rp_gpa, int nasid)
893 {
894 short partid = remote_rp->SAL_partid;
895 struct xpc_partition *part = &xpc_partitions[partid];
896 struct xpc_activate_mq_msg_activate_req_uv msg;
897
898 part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
899 part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
900 part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
901 part->sn.uv.activate_gru_mq_desc_gpa =
902 remote_rp->sn.uv.activate_gru_mq_desc_gpa;
903
904 /*
905 * ??? Is it a good idea to make this conditional on what is
906 * ??? potentially stale state information?
907 */
908 if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
909 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
910 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
911 msg.activate_gru_mq_desc_gpa =
912 xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
913 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
914 XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
915 }
916
917 if (part->act_state == XPC_P_AS_INACTIVE)
918 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
919 }
920
921 static void
922 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
923 {
924 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
925 }
926
927 static void
928 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
929 {
930 struct xpc_activate_mq_msg_deactivate_req_uv msg;
931
932 /*
933 * ??? Is it a good idea to make this conditional on what is
934 * ??? potentially stale state information?
935 */
936 if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
937 part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
938
939 msg.reason = part->reason;
940 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
941 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
942 }
943 }
944
945 static void
946 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
947 {
948 /* nothing needs to be done */
949 return;
950 }
951
952 static void
953 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
954 {
955 head->first = NULL;
956 head->last = NULL;
957 spin_lock_init(&head->lock);
958 head->n_entries = 0;
959 }
960
961 static void *
962 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
963 {
964 unsigned long irq_flags;
965 struct xpc_fifo_entry_uv *first;
966
967 spin_lock_irqsave(&head->lock, irq_flags);
968 first = head->first;
969 if (head->first != NULL) {
970 head->first = first->next;
971 if (head->first == NULL)
972 head->last = NULL;
973
974 head->n_entries--;
975 BUG_ON(head->n_entries < 0);
976
977 first->next = NULL;
978 }
979 spin_unlock_irqrestore(&head->lock, irq_flags);
980 return first;
981 }
982
983 static void
984 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
985 struct xpc_fifo_entry_uv *last)
986 {
987 unsigned long irq_flags;
988
989 last->next = NULL;
990 spin_lock_irqsave(&head->lock, irq_flags);
991 if (head->last != NULL)
992 head->last->next = last;
993 else
994 head->first = last;
995 head->last = last;
996 head->n_entries++;
997 spin_unlock_irqrestore(&head->lock, irq_flags);
998 }
999
1000 static int
1001 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
1002 {
1003 return head->n_entries;
1004 }
1005
1006 /*
1007 * Setup the channel structures that are uv specific.
1008 */
1009 static enum xp_retval
1010 xpc_setup_ch_structures_uv(struct xpc_partition *part)
1011 {
1012 struct xpc_channel_uv *ch_uv;
1013 int ch_number;
1014
1015 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
1016 ch_uv = &part->channels[ch_number].sn.uv;
1017
1018 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1019 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1020 }
1021
1022 return xpSuccess;
1023 }
1024
1025 /*
1026 * Teardown the channel structures that are uv specific.
1027 */
1028 static void
1029 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1030 {
1031 /* nothing needs to be done */
1032 return;
1033 }
1034
1035 static enum xp_retval
1036 xpc_make_first_contact_uv(struct xpc_partition *part)
1037 {
1038 struct xpc_activate_mq_msg_uv msg;
1039
1040 /*
1041 * We send a sync msg to get the remote partition's remote_act_state
1042 * updated to our current act_state which at this point should
1043 * be XPC_P_AS_ACTIVATING.
1044 */
1045 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1046 XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1047
1048 while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1049 (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1050
1051 dev_dbg(xpc_part, "waiting to make first contact with "
1052 "partition %d\n", XPC_PARTID(part));
1053
1054 /* wait a 1/4 of a second or so */
1055 (void)msleep_interruptible(250);
1056
1057 if (part->act_state == XPC_P_AS_DEACTIVATING)
1058 return part->reason;
1059 }
1060
1061 return xpSuccess;
1062 }
1063
1064 static u64
1065 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1066 {
1067 unsigned long irq_flags;
1068 union xpc_channel_ctl_flags chctl;
1069
1070 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1071 chctl = part->chctl;
1072 if (chctl.all_flags != 0)
1073 part->chctl.all_flags = 0;
1074
1075 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1076 return chctl.all_flags;
1077 }
1078
1079 static enum xp_retval
1080 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1081 {
1082 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1083 struct xpc_send_msg_slot_uv *msg_slot;
1084 unsigned long irq_flags;
1085 int nentries;
1086 int entry;
1087 size_t nbytes;
1088
1089 for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1090 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1091 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1092 if (ch_uv->send_msg_slots == NULL)
1093 continue;
1094
1095 for (entry = 0; entry < nentries; entry++) {
1096 msg_slot = &ch_uv->send_msg_slots[entry];
1097
1098 msg_slot->msg_slot_number = entry;
1099 xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1100 &msg_slot->next);
1101 }
1102
1103 spin_lock_irqsave(&ch->lock, irq_flags);
1104 if (nentries < ch->local_nentries)
1105 ch->local_nentries = nentries;
1106 spin_unlock_irqrestore(&ch->lock, irq_flags);
1107 return xpSuccess;
1108 }
1109
1110 return xpNoMemory;
1111 }
1112
1113 static enum xp_retval
1114 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1115 {
1116 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1117 struct xpc_notify_mq_msg_uv *msg_slot;
1118 unsigned long irq_flags;
1119 int nentries;
1120 int entry;
1121 size_t nbytes;
1122
1123 for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1124 nbytes = nentries * ch->entry_size;
1125 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1126 if (ch_uv->recv_msg_slots == NULL)
1127 continue;
1128
1129 for (entry = 0; entry < nentries; entry++) {
1130 msg_slot = ch_uv->recv_msg_slots +
1131 entry * ch->entry_size;
1132
1133 msg_slot->hdr.msg_slot_number = entry;
1134 }
1135
1136 spin_lock_irqsave(&ch->lock, irq_flags);
1137 if (nentries < ch->remote_nentries)
1138 ch->remote_nentries = nentries;
1139 spin_unlock_irqrestore(&ch->lock, irq_flags);
1140 return xpSuccess;
1141 }
1142
1143 return xpNoMemory;
1144 }
1145
1146 /*
1147 * Allocate msg_slots associated with the channel.
1148 */
1149 static enum xp_retval
1150 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1151 {
1152 static enum xp_retval ret;
1153 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1154
1155 DBUG_ON(ch->flags & XPC_C_SETUP);
1156
1157 ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1158 gru_message_queue_desc),
1159 GFP_KERNEL);
1160 if (ch_uv->cached_notify_gru_mq_desc == NULL)
1161 return xpNoMemory;
1162
1163 ret = xpc_allocate_send_msg_slot_uv(ch);
1164 if (ret == xpSuccess) {
1165
1166 ret = xpc_allocate_recv_msg_slot_uv(ch);
1167 if (ret != xpSuccess) {
1168 kfree(ch_uv->send_msg_slots);
1169 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1170 }
1171 }
1172 return ret;
1173 }
1174
1175 /*
1176 * Free up msg_slots and clear other stuff that were setup for the specified
1177 * channel.
1178 */
1179 static void
1180 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1181 {
1182 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1183
1184 DBUG_ON(!spin_is_locked(&ch->lock));
1185
1186 kfree(ch_uv->cached_notify_gru_mq_desc);
1187 ch_uv->cached_notify_gru_mq_desc = NULL;
1188
1189 if (ch->flags & XPC_C_SETUP) {
1190 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1191 kfree(ch_uv->send_msg_slots);
1192 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1193 kfree(ch_uv->recv_msg_slots);
1194 }
1195 }
1196
1197 static void
1198 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1199 {
1200 struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1201
1202 msg.ch_number = ch->number;
1203 msg.reason = ch->reason;
1204 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1205 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1206 }
1207
1208 static void
1209 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1210 {
1211 struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1212
1213 msg.ch_number = ch->number;
1214 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1215 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1216 }
1217
1218 static void
1219 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1220 {
1221 struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1222
1223 msg.ch_number = ch->number;
1224 msg.entry_size = ch->entry_size;
1225 msg.local_nentries = ch->local_nentries;
1226 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1227 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1228 }
1229
1230 static void
1231 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1232 {
1233 struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1234
1235 msg.ch_number = ch->number;
1236 msg.local_nentries = ch->local_nentries;
1237 msg.remote_nentries = ch->remote_nentries;
1238 msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1239 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1240 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1241 }
1242
1243 static void
1244 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1245 {
1246 struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1247
1248 msg.ch_number = ch->number;
1249 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1250 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1251 }
1252
1253 static void
1254 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1255 {
1256 unsigned long irq_flags;
1257
1258 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1259 part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1260 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1261
1262 xpc_wakeup_channel_mgr(part);
1263 }
1264
1265 static enum xp_retval
1266 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1267 unsigned long gru_mq_desc_gpa)
1268 {
1269 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1270
1271 DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1272 return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1273 gru_mq_desc_gpa);
1274 }
1275
1276 static void
1277 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1278 {
1279 struct xpc_activate_mq_msg_uv msg;
1280
1281 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1282 XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1283 }
1284
1285 static void
1286 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1287 {
1288 struct xpc_activate_mq_msg_uv msg;
1289
1290 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1291 XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1292 }
1293
1294 static void
1295 xpc_assume_partition_disengaged_uv(short partid)
1296 {
1297 struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1298 unsigned long irq_flags;
1299
1300 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1301 part_uv->flags &= ~XPC_P_ENGAGED_UV;
1302 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1303 }
1304
1305 static int
1306 xpc_partition_engaged_uv(short partid)
1307 {
1308 return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1309 }
1310
1311 static int
1312 xpc_any_partition_engaged_uv(void)
1313 {
1314 struct xpc_partition_uv *part_uv;
1315 short partid;
1316
1317 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1318 part_uv = &xpc_partitions[partid].sn.uv;
1319 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1320 return 1;
1321 }
1322 return 0;
1323 }
1324
1325 static enum xp_retval
1326 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1327 struct xpc_send_msg_slot_uv **address_of_msg_slot)
1328 {
1329 enum xp_retval ret;
1330 struct xpc_send_msg_slot_uv *msg_slot;
1331 struct xpc_fifo_entry_uv *entry;
1332
1333 while (1) {
1334 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1335 if (entry != NULL)
1336 break;
1337
1338 if (flags & XPC_NOWAIT)
1339 return xpNoWait;
1340
1341 ret = xpc_allocate_msg_wait(ch);
1342 if (ret != xpInterrupted && ret != xpTimeout)
1343 return ret;
1344 }
1345
1346 msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1347 *address_of_msg_slot = msg_slot;
1348 return xpSuccess;
1349 }
1350
1351 static void
1352 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1353 struct xpc_send_msg_slot_uv *msg_slot)
1354 {
1355 xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1356
1357 /* wakeup anyone waiting for a free msg slot */
1358 if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1359 wake_up(&ch->msg_allocate_wq);
1360 }
1361
1362 static void
1363 xpc_notify_sender_uv(struct xpc_channel *ch,
1364 struct xpc_send_msg_slot_uv *msg_slot,
1365 enum xp_retval reason)
1366 {
1367 xpc_notify_func func = msg_slot->func;
1368
1369 if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1370
1371 atomic_dec(&ch->n_to_notify);
1372
1373 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1374 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1375 msg_slot->msg_slot_number, ch->partid, ch->number);
1376
1377 func(reason, ch->partid, ch->number, msg_slot->key);
1378
1379 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1380 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1381 msg_slot->msg_slot_number, ch->partid, ch->number);
1382 }
1383 }
1384
1385 static void
1386 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1387 struct xpc_notify_mq_msg_uv *msg)
1388 {
1389 struct xpc_send_msg_slot_uv *msg_slot;
1390 int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1391
1392 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1393
1394 BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1395 msg_slot->msg_slot_number += ch->local_nentries;
1396
1397 if (msg_slot->func != NULL)
1398 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1399
1400 xpc_free_msg_slot_uv(ch, msg_slot);
1401 }
1402
1403 static void
1404 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1405 struct xpc_notify_mq_msg_uv *msg)
1406 {
1407 struct xpc_partition_uv *part_uv = &part->sn.uv;
1408 struct xpc_channel *ch;
1409 struct xpc_channel_uv *ch_uv;
1410 struct xpc_notify_mq_msg_uv *msg_slot;
1411 unsigned long irq_flags;
1412 int ch_number = msg->hdr.ch_number;
1413
1414 if (unlikely(ch_number >= part->nchannels)) {
1415 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1416 "channel number=0x%x in message from partid=%d\n",
1417 ch_number, XPC_PARTID(part));
1418
1419 /* get hb checker to deactivate from the remote partition */
1420 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1421 if (part_uv->act_state_req == 0)
1422 xpc_activate_IRQ_rcvd++;
1423 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1424 part_uv->reason = xpBadChannelNumber;
1425 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1426
1427 wake_up_interruptible(&xpc_activate_IRQ_wq);
1428 return;
1429 }
1430
1431 ch = &part->channels[ch_number];
1432 xpc_msgqueue_ref(ch);
1433
1434 if (!(ch->flags & XPC_C_CONNECTED)) {
1435 xpc_msgqueue_deref(ch);
1436 return;
1437 }
1438
1439 /* see if we're really dealing with an ACK for a previously sent msg */
1440 if (msg->hdr.size == 0) {
1441 xpc_handle_notify_mq_ack_uv(ch, msg);
1442 xpc_msgqueue_deref(ch);
1443 return;
1444 }
1445
1446 /* we're dealing with a normal message sent via the notify_mq */
1447 ch_uv = &ch->sn.uv;
1448
1449 msg_slot = ch_uv->recv_msg_slots +
1450 (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1451
1452 BUG_ON(msg_slot->hdr.size != 0);
1453
1454 memcpy(msg_slot, msg, msg->hdr.size);
1455
1456 xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1457
1458 if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1459 /*
1460 * If there is an existing idle kthread get it to deliver
1461 * the payload, otherwise we'll have to get the channel mgr
1462 * for this partition to create a kthread to do the delivery.
1463 */
1464 if (atomic_read(&ch->kthreads_idle) > 0)
1465 wake_up_nr(&ch->idle_wq, 1);
1466 else
1467 xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1468 }
1469 xpc_msgqueue_deref(ch);
1470 }
1471
1472 static irqreturn_t
1473 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1474 {
1475 struct xpc_notify_mq_msg_uv *msg;
1476 short partid;
1477 struct xpc_partition *part;
1478
1479 while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1480 NULL) {
1481
1482 partid = msg->hdr.partid;
1483 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1484 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1485 "invalid partid=0x%x in message\n", partid);
1486 } else {
1487 part = &xpc_partitions[partid];
1488
1489 if (xpc_part_ref(part)) {
1490 xpc_handle_notify_mq_msg_uv(part, msg);
1491 xpc_part_deref(part);
1492 }
1493 }
1494
1495 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1496 }
1497
1498 return IRQ_HANDLED;
1499 }
1500
1501 static int
1502 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1503 {
1504 return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1505 }
1506
1507 static void
1508 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1509 {
1510 struct xpc_channel *ch = &part->channels[ch_number];
1511 int ndeliverable_payloads;
1512
1513 xpc_msgqueue_ref(ch);
1514
1515 ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1516
1517 if (ndeliverable_payloads > 0 &&
1518 (ch->flags & XPC_C_CONNECTED) &&
1519 (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1520
1521 xpc_activate_kthreads(ch, ndeliverable_payloads);
1522 }
1523
1524 xpc_msgqueue_deref(ch);
1525 }
1526
1527 static enum xp_retval
1528 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1529 u16 payload_size, u8 notify_type, xpc_notify_func func,
1530 void *key)
1531 {
1532 enum xp_retval ret = xpSuccess;
1533 struct xpc_send_msg_slot_uv *msg_slot = NULL;
1534 struct xpc_notify_mq_msg_uv *msg;
1535 u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1536 size_t msg_size;
1537
1538 DBUG_ON(notify_type != XPC_N_CALL);
1539
1540 msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1541 if (msg_size > ch->entry_size)
1542 return xpPayloadTooBig;
1543
1544 xpc_msgqueue_ref(ch);
1545
1546 if (ch->flags & XPC_C_DISCONNECTING) {
1547 ret = ch->reason;
1548 goto out_1;
1549 }
1550 if (!(ch->flags & XPC_C_CONNECTED)) {
1551 ret = xpNotConnected;
1552 goto out_1;
1553 }
1554
1555 ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1556 if (ret != xpSuccess)
1557 goto out_1;
1558
1559 if (func != NULL) {
1560 atomic_inc(&ch->n_to_notify);
1561
1562 msg_slot->key = key;
1563 smp_wmb(); /* a non-NULL func must hit memory after the key */
1564 msg_slot->func = func;
1565
1566 if (ch->flags & XPC_C_DISCONNECTING) {
1567 ret = ch->reason;
1568 goto out_2;
1569 }
1570 }
1571
1572 msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1573 msg->hdr.partid = xp_partition_id;
1574 msg->hdr.ch_number = ch->number;
1575 msg->hdr.size = msg_size;
1576 msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1577 memcpy(&msg->payload, payload, payload_size);
1578
1579 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1580 msg_size);
1581 if (ret == xpSuccess)
1582 goto out_1;
1583
1584 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1585 out_2:
1586 if (func != NULL) {
1587 /*
1588 * Try to NULL the msg_slot's func field. If we fail, then
1589 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1590 * case we need to pretend we succeeded to send the message
1591 * since the user will get a callout for the disconnect error
1592 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1593 * error returned here will confuse them. Additionally, since
1594 * in this case the channel is being disconnected we don't need
1595 * to put the the msg_slot back on the free list.
1596 */
1597 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1598 ret = xpSuccess;
1599 goto out_1;
1600 }
1601
1602 msg_slot->key = NULL;
1603 atomic_dec(&ch->n_to_notify);
1604 }
1605 xpc_free_msg_slot_uv(ch, msg_slot);
1606 out_1:
1607 xpc_msgqueue_deref(ch);
1608 return ret;
1609 }
1610
1611 /*
1612 * Tell the callers of xpc_send_notify() that the status of their payloads
1613 * is unknown because the channel is now disconnecting.
1614 *
1615 * We don't worry about putting these msg_slots on the free list since the
1616 * msg_slots themselves are about to be kfree'd.
1617 */
1618 static void
1619 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1620 {
1621 struct xpc_send_msg_slot_uv *msg_slot;
1622 int entry;
1623
1624 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1625
1626 for (entry = 0; entry < ch->local_nentries; entry++) {
1627
1628 if (atomic_read(&ch->n_to_notify) == 0)
1629 break;
1630
1631 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1632 if (msg_slot->func != NULL)
1633 xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1634 }
1635 }
1636
1637 /*
1638 * Get the next deliverable message's payload.
1639 */
1640 static void *
1641 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1642 {
1643 struct xpc_fifo_entry_uv *entry;
1644 struct xpc_notify_mq_msg_uv *msg;
1645 void *payload = NULL;
1646
1647 if (!(ch->flags & XPC_C_DISCONNECTING)) {
1648 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1649 if (entry != NULL) {
1650 msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1651 hdr.u.next);
1652 payload = &msg->payload;
1653 }
1654 }
1655 return payload;
1656 }
1657
1658 static void
1659 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1660 {
1661 struct xpc_notify_mq_msg_uv *msg;
1662 enum xp_retval ret;
1663
1664 msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1665
1666 /* return an ACK to the sender of this message */
1667
1668 msg->hdr.partid = xp_partition_id;
1669 msg->hdr.size = 0; /* size of zero indicates this is an ACK */
1670
1671 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1672 sizeof(struct xpc_notify_mq_msghdr_uv));
1673 if (ret != xpSuccess)
1674 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1675 }
1676
1677 static struct xpc_arch_operations xpc_arch_ops_uv = {
1678 .setup_partitions = xpc_setup_partitions_uv,
1679 .teardown_partitions = xpc_teardown_partitions_uv,
1680 .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1681 .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1682 .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1683
1684 .allow_hb = xpc_allow_hb_uv,
1685 .disallow_hb = xpc_disallow_hb_uv,
1686 .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1687 .increment_heartbeat = xpc_increment_heartbeat_uv,
1688 .offline_heartbeat = xpc_offline_heartbeat_uv,
1689 .online_heartbeat = xpc_online_heartbeat_uv,
1690 .heartbeat_init = xpc_heartbeat_init_uv,
1691 .heartbeat_exit = xpc_heartbeat_exit_uv,
1692 .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1693
1694 .request_partition_activation =
1695 xpc_request_partition_activation_uv,
1696 .request_partition_reactivation =
1697 xpc_request_partition_reactivation_uv,
1698 .request_partition_deactivation =
1699 xpc_request_partition_deactivation_uv,
1700 .cancel_partition_deactivation_request =
1701 xpc_cancel_partition_deactivation_request_uv,
1702
1703 .setup_ch_structures = xpc_setup_ch_structures_uv,
1704 .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1705
1706 .make_first_contact = xpc_make_first_contact_uv,
1707
1708 .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1709 .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1710 .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1711 .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1712 .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1713 .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1714 .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1715
1716 .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1717
1718 .setup_msg_structures = xpc_setup_msg_structures_uv,
1719 .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1720
1721 .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1722 .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1723 .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1724 .partition_engaged = xpc_partition_engaged_uv,
1725 .any_partition_engaged = xpc_any_partition_engaged_uv,
1726
1727 .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1728 .send_payload = xpc_send_payload_uv,
1729 .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1730 .received_payload = xpc_received_payload_uv,
1731 .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1732 };
1733
1734 int
1735 xpc_init_uv(void)
1736 {
1737 xpc_arch_ops = xpc_arch_ops_uv;
1738
1739 if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1740 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1741 XPC_MSG_HDR_MAX_SIZE);
1742 return -E2BIG;
1743 }
1744
1745 xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0,
1746 XPC_ACTIVATE_IRQ_NAME,
1747 xpc_handle_activate_IRQ_uv);
1748 if (IS_ERR(xpc_activate_mq_uv))
1749 return PTR_ERR(xpc_activate_mq_uv);
1750
1751 xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0,
1752 XPC_NOTIFY_IRQ_NAME,
1753 xpc_handle_notify_IRQ_uv);
1754 if (IS_ERR(xpc_notify_mq_uv)) {
1755 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1756 return PTR_ERR(xpc_notify_mq_uv);
1757 }
1758
1759 return 0;
1760 }
1761
1762 void
1763 xpc_exit_uv(void)
1764 {
1765 xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1766 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1767 }
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