GNU Linux-libre 4.4.284-gnu1
[releases.git] / drivers / misc / sgi-xp / xpc_uv.c
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/cpu.h>
22 #include <linux/module.h>
23 #include <linux/err.h>
24 #include <linux/slab.h>
25 #include <asm/uv/uv_hub.h>
26 #if defined CONFIG_X86_64
27 #include <asm/uv/bios.h>
28 #include <asm/uv/uv_irq.h>
29 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
30 #include <asm/sn/intr.h>
31 #include <asm/sn/sn_sal.h>
32 #endif
33 #include "../sgi-gru/gru.h"
34 #include "../sgi-gru/grukservices.h"
35 #include "xpc.h"
36
37 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
38 struct uv_IO_APIC_route_entry {
39         __u64   vector          :  8,
40                 delivery_mode   :  3,
41                 dest_mode       :  1,
42                 delivery_status :  1,
43                 polarity        :  1,
44                 __reserved_1    :  1,
45                 trigger         :  1,
46                 mask            :  1,
47                 __reserved_2    : 15,
48                 dest            : 32;
49 };
50 #endif
51
52 static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
53
54 #define XPC_ACTIVATE_MSG_SIZE_UV        (1 * GRU_CACHE_LINE_BYTES)
55 #define XPC_ACTIVATE_MQ_SIZE_UV         (4 * XP_MAX_NPARTITIONS_UV * \
56                                          XPC_ACTIVATE_MSG_SIZE_UV)
57 #define XPC_ACTIVATE_IRQ_NAME           "xpc_activate"
58
59 #define XPC_NOTIFY_MSG_SIZE_UV          (2 * GRU_CACHE_LINE_BYTES)
60 #define XPC_NOTIFY_MQ_SIZE_UV           (4 * XP_MAX_NPARTITIONS_UV * \
61                                          XPC_NOTIFY_MSG_SIZE_UV)
62 #define XPC_NOTIFY_IRQ_NAME             "xpc_notify"
63
64 static int xpc_mq_node = -1;
65
66 static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
67 static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
68
69 static int
70 xpc_setup_partitions_uv(void)
71 {
72         short partid;
73         struct xpc_partition_uv *part_uv;
74
75         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
76                 part_uv = &xpc_partitions[partid].sn.uv;
77
78                 mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
79                 spin_lock_init(&part_uv->flags_lock);
80                 part_uv->remote_act_state = XPC_P_AS_INACTIVE;
81         }
82         return 0;
83 }
84
85 static void
86 xpc_teardown_partitions_uv(void)
87 {
88         short partid;
89         struct xpc_partition_uv *part_uv;
90         unsigned long irq_flags;
91
92         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
93                 part_uv = &xpc_partitions[partid].sn.uv;
94
95                 if (part_uv->cached_activate_gru_mq_desc != NULL) {
96                         mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
97                         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
98                         part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
99                         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
100                         kfree(part_uv->cached_activate_gru_mq_desc);
101                         part_uv->cached_activate_gru_mq_desc = NULL;
102                         mutex_unlock(&part_uv->
103                                      cached_activate_gru_mq_desc_mutex);
104                 }
105         }
106 }
107
108 static int
109 xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
110 {
111         int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
112
113 #if defined CONFIG_X86_64
114         mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
115                         UV_AFFINITY_CPU);
116         if (mq->irq < 0)
117                 return mq->irq;
118
119         mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
120
121 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
122         if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
123                 mq->irq = SGI_XPC_ACTIVATE;
124         else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
125                 mq->irq = SGI_XPC_NOTIFY;
126         else
127                 return -EINVAL;
128
129         mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
130         uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
131 #else
132         #error not a supported configuration
133 #endif
134
135         return 0;
136 }
137
138 static void
139 xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
140 {
141 #if defined CONFIG_X86_64
142         uv_teardown_irq(mq->irq);
143
144 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
145         int mmr_pnode;
146         unsigned long mmr_value;
147
148         mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
149         mmr_value = 1UL << 16;
150
151         uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
152 #else
153         #error not a supported configuration
154 #endif
155 }
156
157 static int
158 xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
159 {
160         int ret;
161
162 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
163         int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
164
165         ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
166                                     mq->order, &mq->mmr_offset);
167         if (ret < 0) {
168                 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
169                         ret);
170                 return -EBUSY;
171         }
172 #elif defined CONFIG_X86_64
173         ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
174                                          mq->order, &mq->mmr_offset);
175         if (ret < 0) {
176                 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
177                         "ret=%d\n", ret);
178                 return ret;
179         }
180 #else
181         #error not a supported configuration
182 #endif
183
184         mq->watchlist_num = ret;
185         return 0;
186 }
187
188 static void
189 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
190 {
191         int ret;
192         int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
193
194 #if defined CONFIG_X86_64
195         ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
196         BUG_ON(ret != BIOS_STATUS_SUCCESS);
197 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
198         ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
199         BUG_ON(ret != SALRET_OK);
200 #else
201         #error not a supported configuration
202 #endif
203 }
204
205 static struct xpc_gru_mq_uv *
206 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
207                      irq_handler_t irq_handler)
208 {
209         enum xp_retval xp_ret;
210         int ret;
211         int nid;
212         int nasid;
213         int pg_order;
214         struct page *page;
215         struct xpc_gru_mq_uv *mq;
216         struct uv_IO_APIC_route_entry *mmr_value;
217
218         mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
219         if (mq == NULL) {
220                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
221                         "a xpc_gru_mq_uv structure\n");
222                 ret = -ENOMEM;
223                 goto out_0;
224         }
225
226         mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
227                                   GFP_KERNEL);
228         if (mq->gru_mq_desc == NULL) {
229                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
230                         "a gru_message_queue_desc structure\n");
231                 ret = -ENOMEM;
232                 goto out_1;
233         }
234
235         pg_order = get_order(mq_size);
236         mq->order = pg_order + PAGE_SHIFT;
237         mq_size = 1UL << mq->order;
238
239         mq->mmr_blade = uv_cpu_to_blade_id(cpu);
240
241         nid = cpu_to_node(cpu);
242         page = __alloc_pages_node(nid,
243                                       GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
244                                       pg_order);
245         if (page == NULL) {
246                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
247                         "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
248                 ret = -ENOMEM;
249                 goto out_2;
250         }
251         mq->address = page_address(page);
252
253         /* enable generation of irq when GRU mq operation occurs to this mq */
254         ret = xpc_gru_mq_watchlist_alloc_uv(mq);
255         if (ret != 0)
256                 goto out_3;
257
258         ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
259         if (ret != 0)
260                 goto out_4;
261
262         ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
263         if (ret != 0) {
264                 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
265                         mq->irq, -ret);
266                 goto out_5;
267         }
268
269         nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
270
271         mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
272         ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
273                                      nasid, mmr_value->vector, mmr_value->dest);
274         if (ret != 0) {
275                 dev_err(xpc_part, "gru_create_message_queue() returned "
276                         "error=%d\n", ret);
277                 ret = -EINVAL;
278                 goto out_6;
279         }
280
281         /* allow other partitions to access this GRU mq */
282         xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
283         if (xp_ret != xpSuccess) {
284                 ret = -EACCES;
285                 goto out_6;
286         }
287
288         return mq;
289
290         /* something went wrong */
291 out_6:
292         free_irq(mq->irq, NULL);
293 out_5:
294         xpc_release_gru_mq_irq_uv(mq);
295 out_4:
296         xpc_gru_mq_watchlist_free_uv(mq);
297 out_3:
298         free_pages((unsigned long)mq->address, pg_order);
299 out_2:
300         kfree(mq->gru_mq_desc);
301 out_1:
302         kfree(mq);
303 out_0:
304         return ERR_PTR(ret);
305 }
306
307 static void
308 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
309 {
310         unsigned int mq_size;
311         int pg_order;
312         int ret;
313
314         /* disallow other partitions to access GRU mq */
315         mq_size = 1UL << mq->order;
316         ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
317         BUG_ON(ret != xpSuccess);
318
319         /* unregister irq handler and release mq irq/vector mapping */
320         free_irq(mq->irq, NULL);
321         xpc_release_gru_mq_irq_uv(mq);
322
323         /* disable generation of irq when GRU mq op occurs to this mq */
324         xpc_gru_mq_watchlist_free_uv(mq);
325
326         pg_order = mq->order - PAGE_SHIFT;
327         free_pages((unsigned long)mq->address, pg_order);
328
329         kfree(mq);
330 }
331
332 static enum xp_retval
333 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
334                  size_t msg_size)
335 {
336         enum xp_retval xp_ret;
337         int ret;
338
339         while (1) {
340                 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
341                 if (ret == MQE_OK) {
342                         xp_ret = xpSuccess;
343                         break;
344                 }
345
346                 if (ret == MQE_QUEUE_FULL) {
347                         dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
348                                 "error=MQE_QUEUE_FULL\n");
349                         /* !!! handle QLimit reached; delay & try again */
350                         /* ??? Do we add a limit to the number of retries? */
351                         (void)msleep_interruptible(10);
352                 } else if (ret == MQE_CONGESTION) {
353                         dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
354                                 "error=MQE_CONGESTION\n");
355                         /* !!! handle LB Overflow; simply try again */
356                         /* ??? Do we add a limit to the number of retries? */
357                 } else {
358                         /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
359                         dev_err(xpc_chan, "gru_send_message_gpa() returned "
360                                 "error=%d\n", ret);
361                         xp_ret = xpGruSendMqError;
362                         break;
363                 }
364         }
365         return xp_ret;
366 }
367
368 static void
369 xpc_process_activate_IRQ_rcvd_uv(void)
370 {
371         unsigned long irq_flags;
372         short partid;
373         struct xpc_partition *part;
374         u8 act_state_req;
375
376         DBUG_ON(xpc_activate_IRQ_rcvd == 0);
377
378         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
379         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
380                 part = &xpc_partitions[partid];
381
382                 if (part->sn.uv.act_state_req == 0)
383                         continue;
384
385                 xpc_activate_IRQ_rcvd--;
386                 BUG_ON(xpc_activate_IRQ_rcvd < 0);
387
388                 act_state_req = part->sn.uv.act_state_req;
389                 part->sn.uv.act_state_req = 0;
390                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
391
392                 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
393                         if (part->act_state == XPC_P_AS_INACTIVE)
394                                 xpc_activate_partition(part);
395                         else if (part->act_state == XPC_P_AS_DEACTIVATING)
396                                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
397
398                 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
399                         if (part->act_state == XPC_P_AS_INACTIVE)
400                                 xpc_activate_partition(part);
401                         else
402                                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
403
404                 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
405                         XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
406
407                 } else {
408                         BUG();
409                 }
410
411                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
412                 if (xpc_activate_IRQ_rcvd == 0)
413                         break;
414         }
415         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
416
417 }
418
419 static void
420 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
421                               struct xpc_activate_mq_msghdr_uv *msg_hdr,
422                               int part_setup,
423                               int *wakeup_hb_checker)
424 {
425         unsigned long irq_flags;
426         struct xpc_partition_uv *part_uv = &part->sn.uv;
427         struct xpc_openclose_args *args;
428
429         part_uv->remote_act_state = msg_hdr->act_state;
430
431         switch (msg_hdr->type) {
432         case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
433                 /* syncing of remote_act_state was just done above */
434                 break;
435
436         case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
437                 struct xpc_activate_mq_msg_activate_req_uv *msg;
438
439                 /*
440                  * ??? Do we deal here with ts_jiffies being different
441                  * ??? if act_state != XPC_P_AS_INACTIVE instead of
442                  * ??? below?
443                  */
444                 msg = container_of(msg_hdr, struct
445                                    xpc_activate_mq_msg_activate_req_uv, hdr);
446
447                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
448                 if (part_uv->act_state_req == 0)
449                         xpc_activate_IRQ_rcvd++;
450                 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
451                 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
452                 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
453                 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
454
455                 if (msg->activate_gru_mq_desc_gpa !=
456                     part_uv->activate_gru_mq_desc_gpa) {
457                         spin_lock(&part_uv->flags_lock);
458                         part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
459                         spin_unlock(&part_uv->flags_lock);
460                         part_uv->activate_gru_mq_desc_gpa =
461                             msg->activate_gru_mq_desc_gpa;
462                 }
463                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
464
465                 (*wakeup_hb_checker)++;
466                 break;
467         }
468         case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
469                 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
470
471                 msg = container_of(msg_hdr, struct
472                                    xpc_activate_mq_msg_deactivate_req_uv, hdr);
473
474                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
475                 if (part_uv->act_state_req == 0)
476                         xpc_activate_IRQ_rcvd++;
477                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
478                 part_uv->reason = msg->reason;
479                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
480
481                 (*wakeup_hb_checker)++;
482                 return;
483         }
484         case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
485                 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
486
487                 if (!part_setup)
488                         break;
489
490                 msg = container_of(msg_hdr, struct
491                                    xpc_activate_mq_msg_chctl_closerequest_uv,
492                                    hdr);
493                 args = &part->remote_openclose_args[msg->ch_number];
494                 args->reason = msg->reason;
495
496                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
497                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
498                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
499
500                 xpc_wakeup_channel_mgr(part);
501                 break;
502         }
503         case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
504                 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
505
506                 if (!part_setup)
507                         break;
508
509                 msg = container_of(msg_hdr, struct
510                                    xpc_activate_mq_msg_chctl_closereply_uv,
511                                    hdr);
512
513                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
514                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
515                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
516
517                 xpc_wakeup_channel_mgr(part);
518                 break;
519         }
520         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
521                 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
522
523                 if (!part_setup)
524                         break;
525
526                 msg = container_of(msg_hdr, struct
527                                    xpc_activate_mq_msg_chctl_openrequest_uv,
528                                    hdr);
529                 args = &part->remote_openclose_args[msg->ch_number];
530                 args->entry_size = msg->entry_size;
531                 args->local_nentries = msg->local_nentries;
532
533                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
534                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
535                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
536
537                 xpc_wakeup_channel_mgr(part);
538                 break;
539         }
540         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
541                 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
542
543                 if (!part_setup)
544                         break;
545
546                 msg = container_of(msg_hdr, struct
547                                    xpc_activate_mq_msg_chctl_openreply_uv, hdr);
548                 args = &part->remote_openclose_args[msg->ch_number];
549                 args->remote_nentries = msg->remote_nentries;
550                 args->local_nentries = msg->local_nentries;
551                 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
552
553                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
554                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
555                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
556
557                 xpc_wakeup_channel_mgr(part);
558                 break;
559         }
560         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
561                 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
562
563                 if (!part_setup)
564                         break;
565
566                 msg = container_of(msg_hdr, struct
567                                 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
568                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
569                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
570                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
571
572                 xpc_wakeup_channel_mgr(part);
573         }
574         case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
575                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
576                 part_uv->flags |= XPC_P_ENGAGED_UV;
577                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
578                 break;
579
580         case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
581                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
582                 part_uv->flags &= ~XPC_P_ENGAGED_UV;
583                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
584                 break;
585
586         default:
587                 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
588                         "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
589
590                 /* get hb checker to deactivate from the remote partition */
591                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
592                 if (part_uv->act_state_req == 0)
593                         xpc_activate_IRQ_rcvd++;
594                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
595                 part_uv->reason = xpBadMsgType;
596                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
597
598                 (*wakeup_hb_checker)++;
599                 return;
600         }
601
602         if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
603             part->remote_rp_ts_jiffies != 0) {
604                 /*
605                  * ??? Does what we do here need to be sensitive to
606                  * ??? act_state or remote_act_state?
607                  */
608                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
609                 if (part_uv->act_state_req == 0)
610                         xpc_activate_IRQ_rcvd++;
611                 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
612                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
613
614                 (*wakeup_hb_checker)++;
615         }
616 }
617
618 static irqreturn_t
619 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
620 {
621         struct xpc_activate_mq_msghdr_uv *msg_hdr;
622         short partid;
623         struct xpc_partition *part;
624         int wakeup_hb_checker = 0;
625         int part_referenced;
626
627         while (1) {
628                 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
629                 if (msg_hdr == NULL)
630                         break;
631
632                 partid = msg_hdr->partid;
633                 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
634                         dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
635                                 "received invalid partid=0x%x in message\n",
636                                 partid);
637                 } else {
638                         part = &xpc_partitions[partid];
639
640                         part_referenced = xpc_part_ref(part);
641                         xpc_handle_activate_mq_msg_uv(part, msg_hdr,
642                                                       part_referenced,
643                                                       &wakeup_hb_checker);
644                         if (part_referenced)
645                                 xpc_part_deref(part);
646                 }
647
648                 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
649         }
650
651         if (wakeup_hb_checker)
652                 wake_up_interruptible(&xpc_activate_IRQ_wq);
653
654         return IRQ_HANDLED;
655 }
656
657 static enum xp_retval
658 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
659                                 unsigned long gru_mq_desc_gpa)
660 {
661         enum xp_retval ret;
662
663         ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
664                                sizeof(struct gru_message_queue_desc));
665         if (ret == xpSuccess)
666                 gru_mq_desc->mq = NULL;
667
668         return ret;
669 }
670
671 static enum xp_retval
672 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
673                          int msg_type)
674 {
675         struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
676         struct xpc_partition_uv *part_uv = &part->sn.uv;
677         struct gru_message_queue_desc *gru_mq_desc;
678         unsigned long irq_flags;
679         enum xp_retval ret;
680
681         DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
682
683         msg_hdr->type = msg_type;
684         msg_hdr->partid = xp_partition_id;
685         msg_hdr->act_state = part->act_state;
686         msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
687
688         mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
689 again:
690         if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
691                 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
692                 if (gru_mq_desc == NULL) {
693                         gru_mq_desc = kmalloc(sizeof(struct
694                                               gru_message_queue_desc),
695                                               GFP_KERNEL);
696                         if (gru_mq_desc == NULL) {
697                                 ret = xpNoMemory;
698                                 goto done;
699                         }
700                         part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
701                 }
702
703                 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
704                                                       part_uv->
705                                                       activate_gru_mq_desc_gpa);
706                 if (ret != xpSuccess)
707                         goto done;
708
709                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
710                 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
711                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
712         }
713
714         /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
715         ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
716                                msg_size);
717         if (ret != xpSuccess) {
718                 smp_rmb();      /* ensure a fresh copy of part_uv->flags */
719                 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
720                         goto again;
721         }
722 done:
723         mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
724         return ret;
725 }
726
727 static void
728 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
729                               size_t msg_size, int msg_type)
730 {
731         enum xp_retval ret;
732
733         ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
734         if (unlikely(ret != xpSuccess))
735                 XPC_DEACTIVATE_PARTITION(part, ret);
736 }
737
738 static void
739 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
740                          void *msg, size_t msg_size, int msg_type)
741 {
742         struct xpc_partition *part = &xpc_partitions[ch->partid];
743         enum xp_retval ret;
744
745         ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
746         if (unlikely(ret != xpSuccess)) {
747                 if (irq_flags != NULL)
748                         spin_unlock_irqrestore(&ch->lock, *irq_flags);
749
750                 XPC_DEACTIVATE_PARTITION(part, ret);
751
752                 if (irq_flags != NULL)
753                         spin_lock_irqsave(&ch->lock, *irq_flags);
754         }
755 }
756
757 static void
758 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
759 {
760         unsigned long irq_flags;
761         struct xpc_partition_uv *part_uv = &part->sn.uv;
762
763         /*
764          * !!! Make our side think that the remote partition sent an activate
765          * !!! mq message our way by doing what the activate IRQ handler would
766          * !!! do had one really been sent.
767          */
768
769         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
770         if (part_uv->act_state_req == 0)
771                 xpc_activate_IRQ_rcvd++;
772         part_uv->act_state_req = act_state_req;
773         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
774
775         wake_up_interruptible(&xpc_activate_IRQ_wq);
776 }
777
778 static enum xp_retval
779 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
780                                   size_t *len)
781 {
782         s64 status;
783         enum xp_retval ret;
784
785 #if defined CONFIG_X86_64
786         status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
787                                           (u64 *)len);
788         if (status == BIOS_STATUS_SUCCESS)
789                 ret = xpSuccess;
790         else if (status == BIOS_STATUS_MORE_PASSES)
791                 ret = xpNeedMoreInfo;
792         else
793                 ret = xpBiosError;
794
795 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
796         status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
797         if (status == SALRET_OK)
798                 ret = xpSuccess;
799         else if (status == SALRET_MORE_PASSES)
800                 ret = xpNeedMoreInfo;
801         else
802                 ret = xpSalError;
803
804 #else
805         #error not a supported configuration
806 #endif
807
808         return ret;
809 }
810
811 static int
812 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
813 {
814         xpc_heartbeat_uv =
815             &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
816         rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
817         rp->sn.uv.activate_gru_mq_desc_gpa =
818             uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
819         return 0;
820 }
821
822 static void
823 xpc_allow_hb_uv(short partid)
824 {
825 }
826
827 static void
828 xpc_disallow_hb_uv(short partid)
829 {
830 }
831
832 static void
833 xpc_disallow_all_hbs_uv(void)
834 {
835 }
836
837 static void
838 xpc_increment_heartbeat_uv(void)
839 {
840         xpc_heartbeat_uv->value++;
841 }
842
843 static void
844 xpc_offline_heartbeat_uv(void)
845 {
846         xpc_increment_heartbeat_uv();
847         xpc_heartbeat_uv->offline = 1;
848 }
849
850 static void
851 xpc_online_heartbeat_uv(void)
852 {
853         xpc_increment_heartbeat_uv();
854         xpc_heartbeat_uv->offline = 0;
855 }
856
857 static void
858 xpc_heartbeat_init_uv(void)
859 {
860         xpc_heartbeat_uv->value = 1;
861         xpc_heartbeat_uv->offline = 0;
862 }
863
864 static void
865 xpc_heartbeat_exit_uv(void)
866 {
867         xpc_offline_heartbeat_uv();
868 }
869
870 static enum xp_retval
871 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
872 {
873         struct xpc_partition_uv *part_uv = &part->sn.uv;
874         enum xp_retval ret;
875
876         ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
877                                part_uv->heartbeat_gpa,
878                                sizeof(struct xpc_heartbeat_uv));
879         if (ret != xpSuccess)
880                 return ret;
881
882         if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
883             !part_uv->cached_heartbeat.offline) {
884
885                 ret = xpNoHeartbeat;
886         } else {
887                 part->last_heartbeat = part_uv->cached_heartbeat.value;
888         }
889         return ret;
890 }
891
892 static void
893 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
894                                     unsigned long remote_rp_gpa, int nasid)
895 {
896         short partid = remote_rp->SAL_partid;
897         struct xpc_partition *part = &xpc_partitions[partid];
898         struct xpc_activate_mq_msg_activate_req_uv msg;
899
900         part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
901         part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
902         part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
903         part->sn.uv.activate_gru_mq_desc_gpa =
904             remote_rp->sn.uv.activate_gru_mq_desc_gpa;
905
906         /*
907          * ??? Is it a good idea to make this conditional on what is
908          * ??? potentially stale state information?
909          */
910         if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
911                 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
912                 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
913                 msg.activate_gru_mq_desc_gpa =
914                     xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
915                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
916                                            XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
917         }
918
919         if (part->act_state == XPC_P_AS_INACTIVE)
920                 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
921 }
922
923 static void
924 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
925 {
926         xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
927 }
928
929 static void
930 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
931 {
932         struct xpc_activate_mq_msg_deactivate_req_uv msg;
933
934         /*
935          * ??? Is it a good idea to make this conditional on what is
936          * ??? potentially stale state information?
937          */
938         if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
939             part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
940
941                 msg.reason = part->reason;
942                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
943                                          XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
944         }
945 }
946
947 static void
948 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
949 {
950         /* nothing needs to be done */
951         return;
952 }
953
954 static void
955 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
956 {
957         head->first = NULL;
958         head->last = NULL;
959         spin_lock_init(&head->lock);
960         head->n_entries = 0;
961 }
962
963 static void *
964 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
965 {
966         unsigned long irq_flags;
967         struct xpc_fifo_entry_uv *first;
968
969         spin_lock_irqsave(&head->lock, irq_flags);
970         first = head->first;
971         if (head->first != NULL) {
972                 head->first = first->next;
973                 if (head->first == NULL)
974                         head->last = NULL;
975
976                 head->n_entries--;
977                 BUG_ON(head->n_entries < 0);
978
979                 first->next = NULL;
980         }
981         spin_unlock_irqrestore(&head->lock, irq_flags);
982         return first;
983 }
984
985 static void
986 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
987                       struct xpc_fifo_entry_uv *last)
988 {
989         unsigned long irq_flags;
990
991         last->next = NULL;
992         spin_lock_irqsave(&head->lock, irq_flags);
993         if (head->last != NULL)
994                 head->last->next = last;
995         else
996                 head->first = last;
997         head->last = last;
998         head->n_entries++;
999         spin_unlock_irqrestore(&head->lock, irq_flags);
1000 }
1001
1002 static int
1003 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
1004 {
1005         return head->n_entries;
1006 }
1007
1008 /*
1009  * Setup the channel structures that are uv specific.
1010  */
1011 static enum xp_retval
1012 xpc_setup_ch_structures_uv(struct xpc_partition *part)
1013 {
1014         struct xpc_channel_uv *ch_uv;
1015         int ch_number;
1016
1017         for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
1018                 ch_uv = &part->channels[ch_number].sn.uv;
1019
1020                 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1021                 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1022         }
1023
1024         return xpSuccess;
1025 }
1026
1027 /*
1028  * Teardown the channel structures that are uv specific.
1029  */
1030 static void
1031 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1032 {
1033         /* nothing needs to be done */
1034         return;
1035 }
1036
1037 static enum xp_retval
1038 xpc_make_first_contact_uv(struct xpc_partition *part)
1039 {
1040         struct xpc_activate_mq_msg_uv msg;
1041
1042         /*
1043          * We send a sync msg to get the remote partition's remote_act_state
1044          * updated to our current act_state which at this point should
1045          * be XPC_P_AS_ACTIVATING.
1046          */
1047         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1048                                       XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1049
1050         while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1051                  (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1052
1053                 dev_dbg(xpc_part, "waiting to make first contact with "
1054                         "partition %d\n", XPC_PARTID(part));
1055
1056                 /* wait a 1/4 of a second or so */
1057                 (void)msleep_interruptible(250);
1058
1059                 if (part->act_state == XPC_P_AS_DEACTIVATING)
1060                         return part->reason;
1061         }
1062
1063         return xpSuccess;
1064 }
1065
1066 static u64
1067 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1068 {
1069         unsigned long irq_flags;
1070         union xpc_channel_ctl_flags chctl;
1071
1072         spin_lock_irqsave(&part->chctl_lock, irq_flags);
1073         chctl = part->chctl;
1074         if (chctl.all_flags != 0)
1075                 part->chctl.all_flags = 0;
1076
1077         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1078         return chctl.all_flags;
1079 }
1080
1081 static enum xp_retval
1082 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1083 {
1084         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1085         struct xpc_send_msg_slot_uv *msg_slot;
1086         unsigned long irq_flags;
1087         int nentries;
1088         int entry;
1089         size_t nbytes;
1090
1091         for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1092                 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1093                 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1094                 if (ch_uv->send_msg_slots == NULL)
1095                         continue;
1096
1097                 for (entry = 0; entry < nentries; entry++) {
1098                         msg_slot = &ch_uv->send_msg_slots[entry];
1099
1100                         msg_slot->msg_slot_number = entry;
1101                         xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1102                                               &msg_slot->next);
1103                 }
1104
1105                 spin_lock_irqsave(&ch->lock, irq_flags);
1106                 if (nentries < ch->local_nentries)
1107                         ch->local_nentries = nentries;
1108                 spin_unlock_irqrestore(&ch->lock, irq_flags);
1109                 return xpSuccess;
1110         }
1111
1112         return xpNoMemory;
1113 }
1114
1115 static enum xp_retval
1116 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1117 {
1118         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1119         struct xpc_notify_mq_msg_uv *msg_slot;
1120         unsigned long irq_flags;
1121         int nentries;
1122         int entry;
1123         size_t nbytes;
1124
1125         for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1126                 nbytes = nentries * ch->entry_size;
1127                 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1128                 if (ch_uv->recv_msg_slots == NULL)
1129                         continue;
1130
1131                 for (entry = 0; entry < nentries; entry++) {
1132                         msg_slot = ch_uv->recv_msg_slots +
1133                             entry * ch->entry_size;
1134
1135                         msg_slot->hdr.msg_slot_number = entry;
1136                 }
1137
1138                 spin_lock_irqsave(&ch->lock, irq_flags);
1139                 if (nentries < ch->remote_nentries)
1140                         ch->remote_nentries = nentries;
1141                 spin_unlock_irqrestore(&ch->lock, irq_flags);
1142                 return xpSuccess;
1143         }
1144
1145         return xpNoMemory;
1146 }
1147
1148 /*
1149  * Allocate msg_slots associated with the channel.
1150  */
1151 static enum xp_retval
1152 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1153 {
1154         static enum xp_retval ret;
1155         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1156
1157         DBUG_ON(ch->flags & XPC_C_SETUP);
1158
1159         ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1160                                                    gru_message_queue_desc),
1161                                                    GFP_KERNEL);
1162         if (ch_uv->cached_notify_gru_mq_desc == NULL)
1163                 return xpNoMemory;
1164
1165         ret = xpc_allocate_send_msg_slot_uv(ch);
1166         if (ret == xpSuccess) {
1167
1168                 ret = xpc_allocate_recv_msg_slot_uv(ch);
1169                 if (ret != xpSuccess) {
1170                         kfree(ch_uv->send_msg_slots);
1171                         xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1172                 }
1173         }
1174         return ret;
1175 }
1176
1177 /*
1178  * Free up msg_slots and clear other stuff that were setup for the specified
1179  * channel.
1180  */
1181 static void
1182 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1183 {
1184         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1185
1186         DBUG_ON(!spin_is_locked(&ch->lock));
1187
1188         kfree(ch_uv->cached_notify_gru_mq_desc);
1189         ch_uv->cached_notify_gru_mq_desc = NULL;
1190
1191         if (ch->flags & XPC_C_SETUP) {
1192                 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1193                 kfree(ch_uv->send_msg_slots);
1194                 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1195                 kfree(ch_uv->recv_msg_slots);
1196         }
1197 }
1198
1199 static void
1200 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1201 {
1202         struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1203
1204         msg.ch_number = ch->number;
1205         msg.reason = ch->reason;
1206         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1207                                     XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1208 }
1209
1210 static void
1211 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1212 {
1213         struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1214
1215         msg.ch_number = ch->number;
1216         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1217                                     XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1218 }
1219
1220 static void
1221 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1222 {
1223         struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1224
1225         msg.ch_number = ch->number;
1226         msg.entry_size = ch->entry_size;
1227         msg.local_nentries = ch->local_nentries;
1228         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1229                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1230 }
1231
1232 static void
1233 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1234 {
1235         struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1236
1237         msg.ch_number = ch->number;
1238         msg.local_nentries = ch->local_nentries;
1239         msg.remote_nentries = ch->remote_nentries;
1240         msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1241         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1242                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1243 }
1244
1245 static void
1246 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1247 {
1248         struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1249
1250         msg.ch_number = ch->number;
1251         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1252                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1253 }
1254
1255 static void
1256 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1257 {
1258         unsigned long irq_flags;
1259
1260         spin_lock_irqsave(&part->chctl_lock, irq_flags);
1261         part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1262         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1263
1264         xpc_wakeup_channel_mgr(part);
1265 }
1266
1267 static enum xp_retval
1268 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1269                                unsigned long gru_mq_desc_gpa)
1270 {
1271         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1272
1273         DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1274         return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1275                                                gru_mq_desc_gpa);
1276 }
1277
1278 static void
1279 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1280 {
1281         struct xpc_activate_mq_msg_uv msg;
1282
1283         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1284                                       XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1285 }
1286
1287 static void
1288 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1289 {
1290         struct xpc_activate_mq_msg_uv msg;
1291
1292         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1293                                       XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1294 }
1295
1296 static void
1297 xpc_assume_partition_disengaged_uv(short partid)
1298 {
1299         struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1300         unsigned long irq_flags;
1301
1302         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1303         part_uv->flags &= ~XPC_P_ENGAGED_UV;
1304         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1305 }
1306
1307 static int
1308 xpc_partition_engaged_uv(short partid)
1309 {
1310         return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1311 }
1312
1313 static int
1314 xpc_any_partition_engaged_uv(void)
1315 {
1316         struct xpc_partition_uv *part_uv;
1317         short partid;
1318
1319         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1320                 part_uv = &xpc_partitions[partid].sn.uv;
1321                 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1322                         return 1;
1323         }
1324         return 0;
1325 }
1326
1327 static enum xp_retval
1328 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1329                          struct xpc_send_msg_slot_uv **address_of_msg_slot)
1330 {
1331         enum xp_retval ret;
1332         struct xpc_send_msg_slot_uv *msg_slot;
1333         struct xpc_fifo_entry_uv *entry;
1334
1335         while (1) {
1336                 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1337                 if (entry != NULL)
1338                         break;
1339
1340                 if (flags & XPC_NOWAIT)
1341                         return xpNoWait;
1342
1343                 ret = xpc_allocate_msg_wait(ch);
1344                 if (ret != xpInterrupted && ret != xpTimeout)
1345                         return ret;
1346         }
1347
1348         msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1349         *address_of_msg_slot = msg_slot;
1350         return xpSuccess;
1351 }
1352
1353 static void
1354 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1355                      struct xpc_send_msg_slot_uv *msg_slot)
1356 {
1357         xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1358
1359         /* wakeup anyone waiting for a free msg slot */
1360         if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1361                 wake_up(&ch->msg_allocate_wq);
1362 }
1363
1364 static void
1365 xpc_notify_sender_uv(struct xpc_channel *ch,
1366                      struct xpc_send_msg_slot_uv *msg_slot,
1367                      enum xp_retval reason)
1368 {
1369         xpc_notify_func func = msg_slot->func;
1370
1371         if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1372
1373                 atomic_dec(&ch->n_to_notify);
1374
1375                 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1376                         "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1377                         msg_slot->msg_slot_number, ch->partid, ch->number);
1378
1379                 func(reason, ch->partid, ch->number, msg_slot->key);
1380
1381                 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1382                         "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1383                         msg_slot->msg_slot_number, ch->partid, ch->number);
1384         }
1385 }
1386
1387 static void
1388 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1389                             struct xpc_notify_mq_msg_uv *msg)
1390 {
1391         struct xpc_send_msg_slot_uv *msg_slot;
1392         int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1393
1394         msg_slot = &ch->sn.uv.send_msg_slots[entry];
1395
1396         BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1397         msg_slot->msg_slot_number += ch->local_nentries;
1398
1399         if (msg_slot->func != NULL)
1400                 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1401
1402         xpc_free_msg_slot_uv(ch, msg_slot);
1403 }
1404
1405 static void
1406 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1407                             struct xpc_notify_mq_msg_uv *msg)
1408 {
1409         struct xpc_partition_uv *part_uv = &part->sn.uv;
1410         struct xpc_channel *ch;
1411         struct xpc_channel_uv *ch_uv;
1412         struct xpc_notify_mq_msg_uv *msg_slot;
1413         unsigned long irq_flags;
1414         int ch_number = msg->hdr.ch_number;
1415
1416         if (unlikely(ch_number >= part->nchannels)) {
1417                 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1418                         "channel number=0x%x in message from partid=%d\n",
1419                         ch_number, XPC_PARTID(part));
1420
1421                 /* get hb checker to deactivate from the remote partition */
1422                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1423                 if (part_uv->act_state_req == 0)
1424                         xpc_activate_IRQ_rcvd++;
1425                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1426                 part_uv->reason = xpBadChannelNumber;
1427                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1428
1429                 wake_up_interruptible(&xpc_activate_IRQ_wq);
1430                 return;
1431         }
1432
1433         ch = &part->channels[ch_number];
1434         xpc_msgqueue_ref(ch);
1435
1436         if (!(ch->flags & XPC_C_CONNECTED)) {
1437                 xpc_msgqueue_deref(ch);
1438                 return;
1439         }
1440
1441         /* see if we're really dealing with an ACK for a previously sent msg */
1442         if (msg->hdr.size == 0) {
1443                 xpc_handle_notify_mq_ack_uv(ch, msg);
1444                 xpc_msgqueue_deref(ch);
1445                 return;
1446         }
1447
1448         /* we're dealing with a normal message sent via the notify_mq */
1449         ch_uv = &ch->sn.uv;
1450
1451         msg_slot = ch_uv->recv_msg_slots +
1452             (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1453
1454         BUG_ON(msg_slot->hdr.size != 0);
1455
1456         memcpy(msg_slot, msg, msg->hdr.size);
1457
1458         xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1459
1460         if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1461                 /*
1462                  * If there is an existing idle kthread get it to deliver
1463                  * the payload, otherwise we'll have to get the channel mgr
1464                  * for this partition to create a kthread to do the delivery.
1465                  */
1466                 if (atomic_read(&ch->kthreads_idle) > 0)
1467                         wake_up_nr(&ch->idle_wq, 1);
1468                 else
1469                         xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1470         }
1471         xpc_msgqueue_deref(ch);
1472 }
1473
1474 static irqreturn_t
1475 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1476 {
1477         struct xpc_notify_mq_msg_uv *msg;
1478         short partid;
1479         struct xpc_partition *part;
1480
1481         while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1482                NULL) {
1483
1484                 partid = msg->hdr.partid;
1485                 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1486                         dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1487                                 "invalid partid=0x%x in message\n", partid);
1488                 } else {
1489                         part = &xpc_partitions[partid];
1490
1491                         if (xpc_part_ref(part)) {
1492                                 xpc_handle_notify_mq_msg_uv(part, msg);
1493                                 xpc_part_deref(part);
1494                         }
1495                 }
1496
1497                 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1498         }
1499
1500         return IRQ_HANDLED;
1501 }
1502
1503 static int
1504 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1505 {
1506         return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1507 }
1508
1509 static void
1510 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1511 {
1512         struct xpc_channel *ch = &part->channels[ch_number];
1513         int ndeliverable_payloads;
1514
1515         xpc_msgqueue_ref(ch);
1516
1517         ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1518
1519         if (ndeliverable_payloads > 0 &&
1520             (ch->flags & XPC_C_CONNECTED) &&
1521             (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1522
1523                 xpc_activate_kthreads(ch, ndeliverable_payloads);
1524         }
1525
1526         xpc_msgqueue_deref(ch);
1527 }
1528
1529 static enum xp_retval
1530 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1531                     u16 payload_size, u8 notify_type, xpc_notify_func func,
1532                     void *key)
1533 {
1534         enum xp_retval ret = xpSuccess;
1535         struct xpc_send_msg_slot_uv *msg_slot = NULL;
1536         struct xpc_notify_mq_msg_uv *msg;
1537         u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1538         size_t msg_size;
1539
1540         DBUG_ON(notify_type != XPC_N_CALL);
1541
1542         msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1543         if (msg_size > ch->entry_size)
1544                 return xpPayloadTooBig;
1545
1546         xpc_msgqueue_ref(ch);
1547
1548         if (ch->flags & XPC_C_DISCONNECTING) {
1549                 ret = ch->reason;
1550                 goto out_1;
1551         }
1552         if (!(ch->flags & XPC_C_CONNECTED)) {
1553                 ret = xpNotConnected;
1554                 goto out_1;
1555         }
1556
1557         ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1558         if (ret != xpSuccess)
1559                 goto out_1;
1560
1561         if (func != NULL) {
1562                 atomic_inc(&ch->n_to_notify);
1563
1564                 msg_slot->key = key;
1565                 smp_wmb(); /* a non-NULL func must hit memory after the key */
1566                 msg_slot->func = func;
1567
1568                 if (ch->flags & XPC_C_DISCONNECTING) {
1569                         ret = ch->reason;
1570                         goto out_2;
1571                 }
1572         }
1573
1574         msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1575         msg->hdr.partid = xp_partition_id;
1576         msg->hdr.ch_number = ch->number;
1577         msg->hdr.size = msg_size;
1578         msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1579         memcpy(&msg->payload, payload, payload_size);
1580
1581         ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1582                                msg_size);
1583         if (ret == xpSuccess)
1584                 goto out_1;
1585
1586         XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1587 out_2:
1588         if (func != NULL) {
1589                 /*
1590                  * Try to NULL the msg_slot's func field. If we fail, then
1591                  * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1592                  * case we need to pretend we succeeded to send the message
1593                  * since the user will get a callout for the disconnect error
1594                  * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1595                  * error returned here will confuse them. Additionally, since
1596                  * in this case the channel is being disconnected we don't need
1597                  * to put the the msg_slot back on the free list.
1598                  */
1599                 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1600                         ret = xpSuccess;
1601                         goto out_1;
1602                 }
1603
1604                 msg_slot->key = NULL;
1605                 atomic_dec(&ch->n_to_notify);
1606         }
1607         xpc_free_msg_slot_uv(ch, msg_slot);
1608 out_1:
1609         xpc_msgqueue_deref(ch);
1610         return ret;
1611 }
1612
1613 /*
1614  * Tell the callers of xpc_send_notify() that the status of their payloads
1615  * is unknown because the channel is now disconnecting.
1616  *
1617  * We don't worry about putting these msg_slots on the free list since the
1618  * msg_slots themselves are about to be kfree'd.
1619  */
1620 static void
1621 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1622 {
1623         struct xpc_send_msg_slot_uv *msg_slot;
1624         int entry;
1625
1626         DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1627
1628         for (entry = 0; entry < ch->local_nentries; entry++) {
1629
1630                 if (atomic_read(&ch->n_to_notify) == 0)
1631                         break;
1632
1633                 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1634                 if (msg_slot->func != NULL)
1635                         xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1636         }
1637 }
1638
1639 /*
1640  * Get the next deliverable message's payload.
1641  */
1642 static void *
1643 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1644 {
1645         struct xpc_fifo_entry_uv *entry;
1646         struct xpc_notify_mq_msg_uv *msg;
1647         void *payload = NULL;
1648
1649         if (!(ch->flags & XPC_C_DISCONNECTING)) {
1650                 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1651                 if (entry != NULL) {
1652                         msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1653                                            hdr.u.next);
1654                         payload = &msg->payload;
1655                 }
1656         }
1657         return payload;
1658 }
1659
1660 static void
1661 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1662 {
1663         struct xpc_notify_mq_msg_uv *msg;
1664         enum xp_retval ret;
1665
1666         msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1667
1668         /* return an ACK to the sender of this message */
1669
1670         msg->hdr.partid = xp_partition_id;
1671         msg->hdr.size = 0;      /* size of zero indicates this is an ACK */
1672
1673         ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1674                                sizeof(struct xpc_notify_mq_msghdr_uv));
1675         if (ret != xpSuccess)
1676                 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1677 }
1678
1679 static struct xpc_arch_operations xpc_arch_ops_uv = {
1680         .setup_partitions = xpc_setup_partitions_uv,
1681         .teardown_partitions = xpc_teardown_partitions_uv,
1682         .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1683         .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1684         .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1685
1686         .allow_hb = xpc_allow_hb_uv,
1687         .disallow_hb = xpc_disallow_hb_uv,
1688         .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1689         .increment_heartbeat = xpc_increment_heartbeat_uv,
1690         .offline_heartbeat = xpc_offline_heartbeat_uv,
1691         .online_heartbeat = xpc_online_heartbeat_uv,
1692         .heartbeat_init = xpc_heartbeat_init_uv,
1693         .heartbeat_exit = xpc_heartbeat_exit_uv,
1694         .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1695
1696         .request_partition_activation =
1697                 xpc_request_partition_activation_uv,
1698         .request_partition_reactivation =
1699                 xpc_request_partition_reactivation_uv,
1700         .request_partition_deactivation =
1701                 xpc_request_partition_deactivation_uv,
1702         .cancel_partition_deactivation_request =
1703                 xpc_cancel_partition_deactivation_request_uv,
1704
1705         .setup_ch_structures = xpc_setup_ch_structures_uv,
1706         .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1707
1708         .make_first_contact = xpc_make_first_contact_uv,
1709
1710         .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1711         .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1712         .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1713         .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1714         .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1715         .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1716         .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1717
1718         .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1719
1720         .setup_msg_structures = xpc_setup_msg_structures_uv,
1721         .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1722
1723         .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1724         .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1725         .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1726         .partition_engaged = xpc_partition_engaged_uv,
1727         .any_partition_engaged = xpc_any_partition_engaged_uv,
1728
1729         .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1730         .send_payload = xpc_send_payload_uv,
1731         .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1732         .received_payload = xpc_received_payload_uv,
1733         .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1734 };
1735
1736 static int
1737 xpc_init_mq_node(int nid)
1738 {
1739         int cpu;
1740
1741         get_online_cpus();
1742
1743         for_each_cpu(cpu, cpumask_of_node(nid)) {
1744                 xpc_activate_mq_uv =
1745                         xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, nid,
1746                                              XPC_ACTIVATE_IRQ_NAME,
1747                                              xpc_handle_activate_IRQ_uv);
1748                 if (!IS_ERR(xpc_activate_mq_uv))
1749                         break;
1750         }
1751         if (IS_ERR(xpc_activate_mq_uv)) {
1752                 put_online_cpus();
1753                 return PTR_ERR(xpc_activate_mq_uv);
1754         }
1755
1756         for_each_cpu(cpu, cpumask_of_node(nid)) {
1757                 xpc_notify_mq_uv =
1758                         xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, nid,
1759                                              XPC_NOTIFY_IRQ_NAME,
1760                                              xpc_handle_notify_IRQ_uv);
1761                 if (!IS_ERR(xpc_notify_mq_uv))
1762                         break;
1763         }
1764         if (IS_ERR(xpc_notify_mq_uv)) {
1765                 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1766                 put_online_cpus();
1767                 return PTR_ERR(xpc_notify_mq_uv);
1768         }
1769
1770         put_online_cpus();
1771         return 0;
1772 }
1773
1774 int
1775 xpc_init_uv(void)
1776 {
1777         int nid;
1778         int ret = 0;
1779
1780         xpc_arch_ops = xpc_arch_ops_uv;
1781
1782         if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1783                 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1784                         XPC_MSG_HDR_MAX_SIZE);
1785                 return -E2BIG;
1786         }
1787
1788         if (xpc_mq_node < 0)
1789                 for_each_online_node(nid) {
1790                         ret = xpc_init_mq_node(nid);
1791
1792                         if (!ret)
1793                                 break;
1794                 }
1795         else
1796                 ret = xpc_init_mq_node(xpc_mq_node);
1797
1798         if (ret < 0)
1799                 dev_err(xpc_part, "xpc_init_mq_node() returned error=%d\n",
1800                         -ret);
1801
1802         return ret;
1803 }
1804
1805 void
1806 xpc_exit_uv(void)
1807 {
1808         xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1809         xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1810 }
1811
1812 module_param(xpc_mq_node, int, 0);
1813 MODULE_PARM_DESC(xpc_mq_node, "Node number on which to allocate message queues.");