f7fff4727edb0681840076b7c65b2a0d4b60a368
[linux-2.6.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/err.h>
22 #include <asm/uv/uv_hub.h>
23 #if defined CONFIG_X86_64
24 #include <asm/uv/bios.h>
25 #include <asm/uv/uv_irq.h>
26 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
27 #include <asm/sn/intr.h>
28 #include <asm/sn/sn_sal.h>
29 #endif
30 #include "../sgi-gru/gru.h"
31 #include "../sgi-gru/grukservices.h"
32 #include "xpc.h"
33
34 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
35 struct uv_IO_APIC_route_entry {
36         __u64   vector          :  8,
37                 delivery_mode   :  3,
38                 dest_mode       :  1,
39                 delivery_status :  1,
40                 polarity        :  1,
41                 __reserved_1    :  1,
42                 trigger         :  1,
43                 mask            :  1,
44                 __reserved_2    : 15,
45                 dest            : 32;
46 };
47 #endif
48
49 static atomic64_t xpc_heartbeat_uv;
50 static DECLARE_BITMAP(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_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_sn_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_sn_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         if (mq->irq < 0) {
112                 dev_err(xpc_part, "uv_setup_irq() returned error=%d\n",
113                         -mq->irq);
114                 return mq->irq;
115         }
116
117         mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
118
119 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
120         if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
121                 mq->irq = SGI_XPC_ACTIVATE;
122         else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
123                 mq->irq = SGI_XPC_NOTIFY;
124         else
125                 return -EINVAL;
126
127         mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
128         uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
129 #else
130         #error not a supported configuration
131 #endif
132
133         return 0;
134 }
135
136 static void
137 xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
138 {
139 #if defined CONFIG_X86_64
140         uv_teardown_irq(mq->irq, mq->mmr_blade, mq->mmr_offset);
141
142 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
143         int mmr_pnode;
144         unsigned long mmr_value;
145
146         mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
147         mmr_value = 1UL << 16;
148
149         uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
150 #else
151         #error not a supported configuration
152 #endif
153 }
154
155 static int
156 xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
157 {
158         int ret;
159
160 #if defined CONFIG_X86_64
161         ret = uv_bios_mq_watchlist_alloc(mq->mmr_blade, uv_gpa(mq->address),
162                                          mq->order, &mq->mmr_offset);
163         if (ret < 0) {
164                 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
165                         "ret=%d\n", ret);
166                 return ret;
167         }
168 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
169         ret = sn_mq_watchlist_alloc(mq->mmr_blade, (void *)uv_gpa(mq->address),
170                                     mq->order, &mq->mmr_offset);
171         if (ret < 0) {
172                 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
173                         ret);
174                 return -EBUSY;
175         }
176 #else
177         #error not a supported configuration
178 #endif
179
180         mq->watchlist_num = ret;
181         return 0;
182 }
183
184 static void
185 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
186 {
187         int ret;
188
189 #if defined CONFIG_X86_64
190         ret = uv_bios_mq_watchlist_free(mq->mmr_blade, mq->watchlist_num);
191         BUG_ON(ret != BIOS_STATUS_SUCCESS);
192 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
193         ret = sn_mq_watchlist_free(mq->mmr_blade, mq->watchlist_num);
194         BUG_ON(ret != SALRET_OK);
195 #else
196         #error not a supported configuration
197 #endif
198 }
199
200 static struct xpc_gru_mq_uv *
201 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
202                      irq_handler_t irq_handler)
203 {
204         enum xp_retval xp_ret;
205         int ret;
206         int nid;
207         int pg_order;
208         struct page *page;
209         struct xpc_gru_mq_uv *mq;
210         struct uv_IO_APIC_route_entry *mmr_value;
211
212         mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
213         if (mq == NULL) {
214                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
215                         "a xpc_gru_mq_uv structure\n");
216                 ret = -ENOMEM;
217                 goto out_0;
218         }
219
220         mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
221                                   GFP_KERNEL);
222         if (mq->gru_mq_desc == NULL) {
223                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
224                         "a gru_message_queue_desc structure\n");
225                 ret = -ENOMEM;
226                 goto out_1;
227         }
228
229         pg_order = get_order(mq_size);
230         mq->order = pg_order + PAGE_SHIFT;
231         mq_size = 1UL << mq->order;
232
233         mq->mmr_blade = uv_cpu_to_blade_id(cpu);
234
235         nid = cpu_to_node(cpu);
236         page = alloc_pages_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
237                                 pg_order);
238         if (page == NULL) {
239                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
240                         "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
241                 ret = -ENOMEM;
242                 goto out_2;
243         }
244         mq->address = page_address(page);
245
246         /* enable generation of irq when GRU mq operation occurs to this mq */
247         ret = xpc_gru_mq_watchlist_alloc_uv(mq);
248         if (ret != 0)
249                 goto out_3;
250
251         ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
252         if (ret != 0)
253                 goto out_4;
254
255         ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
256         if (ret != 0) {
257                 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
258                         mq->irq, -ret);
259                 goto out_5;
260         }
261
262         mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
263         ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
264                                        nid, mmr_value->vector, mmr_value->dest);
265         if (ret != 0) {
266                 dev_err(xpc_part, "gru_create_message_queue() returned "
267                         "error=%d\n", ret);
268                 ret = -EINVAL;
269                 goto out_6;
270         }
271
272         /* allow other partitions to access this GRU mq */
273         xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
274         if (xp_ret != xpSuccess) {
275                 ret = -EACCES;
276                 goto out_6;
277         }
278
279         return mq;
280
281         /* something went wrong */
282 out_6:
283         free_irq(mq->irq, NULL);
284 out_5:
285         xpc_release_gru_mq_irq_uv(mq);
286 out_4:
287         xpc_gru_mq_watchlist_free_uv(mq);
288 out_3:
289         free_pages((unsigned long)mq->address, pg_order);
290 out_2:
291         kfree(mq->gru_mq_desc);
292 out_1:
293         kfree(mq);
294 out_0:
295         return ERR_PTR(ret);
296 }
297
298 static void
299 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
300 {
301         unsigned int mq_size;
302         int pg_order;
303         int ret;
304
305         /* disallow other partitions to access GRU mq */
306         mq_size = 1UL << mq->order;
307         ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
308         BUG_ON(ret != xpSuccess);
309
310         /* unregister irq handler and release mq irq/vector mapping */
311         free_irq(mq->irq, NULL);
312         xpc_release_gru_mq_irq_uv(mq);
313
314         /* disable generation of irq when GRU mq op occurs to this mq */
315         xpc_gru_mq_watchlist_free_uv(mq);
316
317         pg_order = mq->order - PAGE_SHIFT;
318         free_pages((unsigned long)mq->address, pg_order);
319
320         kfree(mq);
321 }
322
323 static enum xp_retval
324 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
325                  size_t msg_size)
326 {
327         enum xp_retval xp_ret;
328         int ret;
329
330         while (1) {
331                 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
332                 if (ret == MQE_OK) {
333                         xp_ret = xpSuccess;
334                         break;
335                 }
336
337                 if (ret == MQE_QUEUE_FULL) {
338                         dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
339                                 "error=MQE_QUEUE_FULL\n");
340                         /* !!! handle QLimit reached; delay & try again */
341                         /* ??? Do we add a limit to the number of retries? */
342                         (void)msleep_interruptible(10);
343                 } else if (ret == MQE_CONGESTION) {
344                         dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
345                                 "error=MQE_CONGESTION\n");
346                         /* !!! handle LB Overflow; simply try again */
347                         /* ??? Do we add a limit to the number of retries? */
348                 } else {
349                         /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
350                         dev_err(xpc_chan, "gru_send_message_gpa() returned "
351                                 "error=%d\n", ret);
352                         xp_ret = xpGruSendMqError;
353                         break;
354                 }
355         }
356         return xp_ret;
357 }
358
359 static void
360 xpc_process_activate_IRQ_rcvd_uv(void)
361 {
362         unsigned long irq_flags;
363         short partid;
364         struct xpc_partition *part;
365         u8 act_state_req;
366
367         DBUG_ON(xpc_activate_IRQ_rcvd == 0);
368
369         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
370         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
371                 part = &xpc_partitions[partid];
372
373                 if (part->sn.uv.act_state_req == 0)
374                         continue;
375
376                 xpc_activate_IRQ_rcvd--;
377                 BUG_ON(xpc_activate_IRQ_rcvd < 0);
378
379                 act_state_req = part->sn.uv.act_state_req;
380                 part->sn.uv.act_state_req = 0;
381                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
382
383                 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
384                         if (part->act_state == XPC_P_AS_INACTIVE)
385                                 xpc_activate_partition(part);
386                         else if (part->act_state == XPC_P_AS_DEACTIVATING)
387                                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
388
389                 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
390                         if (part->act_state == XPC_P_AS_INACTIVE)
391                                 xpc_activate_partition(part);
392                         else
393                                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
394
395                 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
396                         XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
397
398                 } else {
399                         BUG();
400                 }
401
402                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
403                 if (xpc_activate_IRQ_rcvd == 0)
404                         break;
405         }
406         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
407
408 }
409
410 static void
411 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
412                               struct xpc_activate_mq_msghdr_uv *msg_hdr,
413                               int *wakeup_hb_checker)
414 {
415         unsigned long irq_flags;
416         struct xpc_partition_uv *part_uv = &part->sn.uv;
417         struct xpc_openclose_args *args;
418
419         part_uv->remote_act_state = msg_hdr->act_state;
420
421         switch (msg_hdr->type) {
422         case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
423                 /* syncing of remote_act_state was just done above */
424                 break;
425
426         case XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV: {
427                 struct xpc_activate_mq_msg_heartbeat_req_uv *msg;
428
429                 msg = container_of(msg_hdr,
430                                    struct xpc_activate_mq_msg_heartbeat_req_uv,
431                                    hdr);
432                 part_uv->heartbeat = msg->heartbeat;
433                 break;
434         }
435         case XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV: {
436                 struct xpc_activate_mq_msg_heartbeat_req_uv *msg;
437
438                 msg = container_of(msg_hdr,
439                                    struct xpc_activate_mq_msg_heartbeat_req_uv,
440                                    hdr);
441                 part_uv->heartbeat = msg->heartbeat;
442
443                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
444                 part_uv->flags |= XPC_P_HEARTBEAT_OFFLINE_UV;
445                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
446                 break;
447         }
448         case XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV: {
449                 struct xpc_activate_mq_msg_heartbeat_req_uv *msg;
450
451                 msg = container_of(msg_hdr,
452                                    struct xpc_activate_mq_msg_heartbeat_req_uv,
453                                    hdr);
454                 part_uv->heartbeat = msg->heartbeat;
455
456                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
457                 part_uv->flags &= ~XPC_P_HEARTBEAT_OFFLINE_UV;
458                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
459                 break;
460         }
461         case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
462                 struct xpc_activate_mq_msg_activate_req_uv *msg;
463
464                 /*
465                  * ??? Do we deal here with ts_jiffies being different
466                  * ??? if act_state != XPC_P_AS_INACTIVE instead of
467                  * ??? below?
468                  */
469                 msg = container_of(msg_hdr, struct
470                                    xpc_activate_mq_msg_activate_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_ACTIVATE_UV;
476                 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
477                 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
478
479                 if (msg->activate_gru_mq_desc_gpa !=
480                     part_uv->activate_gru_mq_desc_gpa) {
481                         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
482                         part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
483                         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
484                         part_uv->activate_gru_mq_desc_gpa =
485                             msg->activate_gru_mq_desc_gpa;
486                 }
487                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
488
489                 (*wakeup_hb_checker)++;
490                 break;
491         }
492         case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
493                 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
494
495                 msg = container_of(msg_hdr, struct
496                                    xpc_activate_mq_msg_deactivate_req_uv, hdr);
497
498                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
499                 if (part_uv->act_state_req == 0)
500                         xpc_activate_IRQ_rcvd++;
501                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
502                 part_uv->reason = msg->reason;
503                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
504
505                 (*wakeup_hb_checker)++;
506                 return;
507         }
508         case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
509                 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
510
511                 msg = container_of(msg_hdr, struct
512                                    xpc_activate_mq_msg_chctl_closerequest_uv,
513                                    hdr);
514                 args = &part->remote_openclose_args[msg->ch_number];
515                 args->reason = msg->reason;
516
517                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
518                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
519                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
520
521                 xpc_wakeup_channel_mgr(part);
522                 break;
523         }
524         case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
525                 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
526
527                 msg = container_of(msg_hdr, struct
528                                    xpc_activate_mq_msg_chctl_closereply_uv,
529                                    hdr);
530
531                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
532                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
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_OPENREQUEST_UV: {
539                 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
540
541                 msg = container_of(msg_hdr, struct
542                                    xpc_activate_mq_msg_chctl_openrequest_uv,
543                                    hdr);
544                 args = &part->remote_openclose_args[msg->ch_number];
545                 args->entry_size = msg->entry_size;
546                 args->local_nentries = msg->local_nentries;
547
548                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
549                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
550                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
551
552                 xpc_wakeup_channel_mgr(part);
553                 break;
554         }
555         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
556                 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
557
558                 msg = container_of(msg_hdr, struct
559                                    xpc_activate_mq_msg_chctl_openreply_uv, hdr);
560                 args = &part->remote_openclose_args[msg->ch_number];
561                 args->remote_nentries = msg->remote_nentries;
562                 args->local_nentries = msg->local_nentries;
563                 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
564
565                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
566                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
567                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
568
569                 xpc_wakeup_channel_mgr(part);
570                 break;
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                                                       &wakeup_hb_checker);
641                         if (part_referenced)
642                                 xpc_part_deref(part);
643                 }
644
645                 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
646         }
647
648         if (wakeup_hb_checker)
649                 wake_up_interruptible(&xpc_activate_IRQ_wq);
650
651         return IRQ_HANDLED;
652 }
653
654 static enum xp_retval
655 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
656                                 unsigned long gru_mq_desc_gpa)
657 {
658         enum xp_retval ret;
659
660         ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
661                                sizeof(struct gru_message_queue_desc));
662         if (ret == xpSuccess)
663                 gru_mq_desc->mq = NULL;
664
665         return ret;
666 }
667
668 static enum xp_retval
669 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
670                          int msg_type)
671 {
672         struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
673         struct xpc_partition_uv *part_uv = &part->sn.uv;
674         struct gru_message_queue_desc *gru_mq_desc;
675         unsigned long irq_flags;
676         enum xp_retval ret;
677
678         DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
679
680         msg_hdr->type = msg_type;
681         msg_hdr->partid = xp_partition_id;
682         msg_hdr->act_state = part->act_state;
683         msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
684
685         mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
686 again:
687         if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
688                 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
689                 if (gru_mq_desc == NULL) {
690                         gru_mq_desc = kmalloc(sizeof(struct
691                                               gru_message_queue_desc),
692                                               GFP_KERNEL);
693                         if (gru_mq_desc == NULL) {
694                                 ret = xpNoMemory;
695                                 goto done;
696                         }
697                         part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
698                 }
699
700                 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
701                                                       part_uv->
702                                                       activate_gru_mq_desc_gpa);
703                 if (ret != xpSuccess)
704                         goto done;
705
706                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
707                 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
708                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
709         }
710
711         /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
712         ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
713                                msg_size);
714         if (ret != xpSuccess) {
715                 smp_rmb();      /* ensure a fresh copy of part_uv->flags */
716                 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
717                         goto again;
718         }
719 done:
720         mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
721         return ret;
722 }
723
724 static void
725 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
726                               size_t msg_size, int msg_type)
727 {
728         enum xp_retval ret;
729
730         ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
731         if (unlikely(ret != xpSuccess))
732                 XPC_DEACTIVATE_PARTITION(part, ret);
733 }
734
735 static void
736 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
737                          void *msg, size_t msg_size, int msg_type)
738 {
739         struct xpc_partition *part = &xpc_partitions[ch->partid];
740         enum xp_retval ret;
741
742         ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
743         if (unlikely(ret != xpSuccess)) {
744                 if (irq_flags != NULL)
745                         spin_unlock_irqrestore(&ch->lock, *irq_flags);
746
747                 XPC_DEACTIVATE_PARTITION(part, ret);
748
749                 if (irq_flags != NULL)
750                         spin_lock_irqsave(&ch->lock, *irq_flags);
751         }
752 }
753
754 static void
755 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
756 {
757         unsigned long irq_flags;
758         struct xpc_partition_uv *part_uv = &part->sn.uv;
759
760         /*
761          * !!! Make our side think that the remote partition sent an activate
762          * !!! message our way by doing what the activate IRQ handler would
763          * !!! do had one really been sent.
764          */
765
766         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
767         if (part_uv->act_state_req == 0)
768                 xpc_activate_IRQ_rcvd++;
769         part_uv->act_state_req = act_state_req;
770         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
771
772         wake_up_interruptible(&xpc_activate_IRQ_wq);
773 }
774
775 static enum xp_retval
776 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
777                                   size_t *len)
778 {
779         s64 status;
780         enum xp_retval ret;
781
782 #if defined CONFIG_X86_64
783         status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
784                                           (u64 *)len);
785         if (status == BIOS_STATUS_SUCCESS)
786                 ret = xpSuccess;
787         else if (status == BIOS_STATUS_MORE_PASSES)
788                 ret = xpNeedMoreInfo;
789         else
790                 ret = xpBiosError;
791
792 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
793         status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
794         if (status == SALRET_OK)
795                 ret = xpSuccess;
796         else if (status == SALRET_MORE_PASSES)
797                 ret = xpNeedMoreInfo;
798         else
799                 ret = xpSalError;
800
801 #else
802         #error not a supported configuration
803 #endif
804
805         return ret;
806 }
807
808 static int
809 xpc_setup_rsvd_page_sn_uv(struct xpc_rsvd_page *rp)
810 {
811         rp->sn.activate_gru_mq_desc_gpa =
812             uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
813         return 0;
814 }
815
816 static void
817 xpc_send_heartbeat_uv(int msg_type)
818 {
819         short partid;
820         struct xpc_partition *part;
821         struct xpc_activate_mq_msg_heartbeat_req_uv msg;
822
823         /*
824          * !!! On uv we're broadcasting a heartbeat message every 5 seconds.
825          * !!! Whereas on sn2 we're bte_copy'ng the heartbeat info every 20
826          * !!! seconds. This is an increase in numalink traffic.
827          * ??? Is this good?
828          */
829
830         msg.heartbeat = atomic64_inc_return(&xpc_heartbeat_uv);
831
832         partid = find_first_bit(xpc_heartbeating_to_mask_uv,
833                                 XP_MAX_NPARTITIONS_UV);
834
835         while (partid < XP_MAX_NPARTITIONS_UV) {
836                 part = &xpc_partitions[partid];
837
838                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
839                                               msg_type);
840
841                 partid = find_next_bit(xpc_heartbeating_to_mask_uv,
842                                        XP_MAX_NPARTITIONS_UV, partid + 1);
843         }
844 }
845
846 static void
847 xpc_increment_heartbeat_uv(void)
848 {
849         xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV);
850 }
851
852 static void
853 xpc_offline_heartbeat_uv(void)
854 {
855         xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV);
856 }
857
858 static void
859 xpc_online_heartbeat_uv(void)
860 {
861         xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV);
862 }
863
864 static void
865 xpc_heartbeat_init_uv(void)
866 {
867         atomic64_set(&xpc_heartbeat_uv, 0);
868         bitmap_zero(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_UV);
869         xpc_heartbeating_to_mask = &xpc_heartbeating_to_mask_uv[0];
870 }
871
872 static void
873 xpc_heartbeat_exit_uv(void)
874 {
875         xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV);
876 }
877
878 static enum xp_retval
879 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
880 {
881         struct xpc_partition_uv *part_uv = &part->sn.uv;
882         enum xp_retval ret = xpNoHeartbeat;
883
884         if (part_uv->remote_act_state != XPC_P_AS_INACTIVE &&
885             part_uv->remote_act_state != XPC_P_AS_DEACTIVATING) {
886
887                 if (part_uv->heartbeat != part->last_heartbeat ||
888                     (part_uv->flags & XPC_P_HEARTBEAT_OFFLINE_UV)) {
889
890                         part->last_heartbeat = part_uv->heartbeat;
891                         ret = xpSuccess;
892                 }
893         }
894         return ret;
895 }
896
897 static void
898 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
899                                     unsigned long remote_rp_gpa, int nasid)
900 {
901         short partid = remote_rp->SAL_partid;
902         struct xpc_partition *part = &xpc_partitions[partid];
903         struct xpc_activate_mq_msg_activate_req_uv msg;
904
905         part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
906         part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
907         part->sn.uv.activate_gru_mq_desc_gpa =
908             remote_rp->sn.activate_gru_mq_desc_gpa;
909
910         /*
911          * ??? Is it a good idea to make this conditional on what is
912          * ??? potentially stale state information?
913          */
914         if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
915                 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
916                 msg.activate_gru_mq_desc_gpa =
917                     xpc_rsvd_page->sn.activate_gru_mq_desc_gpa;
918                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
919                                            XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
920         }
921
922         if (part->act_state == XPC_P_AS_INACTIVE)
923                 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
924 }
925
926 static void
927 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
928 {
929         xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
930 }
931
932 static void
933 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
934 {
935         struct xpc_activate_mq_msg_deactivate_req_uv msg;
936
937         /*
938          * ??? Is it a good idea to make this conditional on what is
939          * ??? potentially stale state information?
940          */
941         if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
942             part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
943
944                 msg.reason = part->reason;
945                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
946                                          XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
947         }
948 }
949
950 static void
951 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
952 {
953         /* nothing needs to be done */
954         return;
955 }
956
957 static void
958 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
959 {
960         head->first = NULL;
961         head->last = NULL;
962         spin_lock_init(&head->lock);
963         head->n_entries = 0;
964 }
965
966 static void *
967 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
968 {
969         unsigned long irq_flags;
970         struct xpc_fifo_entry_uv *first;
971
972         spin_lock_irqsave(&head->lock, irq_flags);
973         first = head->first;
974         if (head->first != NULL) {
975                 head->first = first->next;
976                 if (head->first == NULL)
977                         head->last = NULL;
978         }
979         head->n_entries--;
980         BUG_ON(head->n_entries < 0);
981         spin_unlock_irqrestore(&head->lock, irq_flags);
982         first->next = NULL;
983         return first;
984 }
985
986 static void
987 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
988                       struct xpc_fifo_entry_uv *last)
989 {
990         unsigned long irq_flags;
991
992         last->next = NULL;
993         spin_lock_irqsave(&head->lock, irq_flags);
994         if (head->last != NULL)
995                 head->last->next = last;
996         else
997                 head->first = last;
998         head->last = last;
999         head->n_entries++;
1000         spin_unlock_irqrestore(&head->lock, irq_flags);
1001 }
1002
1003 static int
1004 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
1005 {
1006         return head->n_entries;
1007 }
1008
1009 /*
1010  * Setup the channel structures that are uv specific.
1011  */
1012 static enum xp_retval
1013 xpc_setup_ch_structures_sn_uv(struct xpc_partition *part)
1014 {
1015         struct xpc_channel_uv *ch_uv;
1016         int ch_number;
1017
1018         for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
1019                 ch_uv = &part->channels[ch_number].sn.uv;
1020
1021                 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1022                 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1023         }
1024
1025         return xpSuccess;
1026 }
1027
1028 /*
1029  * Teardown the channel structures that are uv specific.
1030  */
1031 static void
1032 xpc_teardown_ch_structures_sn_uv(struct xpc_partition *part)
1033 {
1034         /* nothing needs to be done */
1035         return;
1036 }
1037
1038 static enum xp_retval
1039 xpc_make_first_contact_uv(struct xpc_partition *part)
1040 {
1041         struct xpc_activate_mq_msg_uv msg;
1042
1043         /*
1044          * We send a sync msg to get the remote partition's remote_act_state
1045          * updated to our current act_state which at this point should
1046          * be XPC_P_AS_ACTIVATING.
1047          */
1048         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1049                                       XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1050
1051         while (part->sn.uv.remote_act_state != XPC_P_AS_ACTIVATING) {
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_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1247 {
1248         unsigned long irq_flags;
1249
1250         spin_lock_irqsave(&part->chctl_lock, irq_flags);
1251         part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1252         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1253
1254         xpc_wakeup_channel_mgr(part);
1255 }
1256
1257 static enum xp_retval
1258 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1259                                unsigned long gru_mq_desc_gpa)
1260 {
1261         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1262
1263         DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1264         return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1265                                                gru_mq_desc_gpa);
1266 }
1267
1268 static void
1269 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1270 {
1271         struct xpc_activate_mq_msg_uv msg;
1272
1273         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1274                                       XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1275 }
1276
1277 static void
1278 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1279 {
1280         struct xpc_activate_mq_msg_uv msg;
1281
1282         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1283                                       XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1284 }
1285
1286 static void
1287 xpc_assume_partition_disengaged_uv(short partid)
1288 {
1289         struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1290         unsigned long irq_flags;
1291
1292         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1293         part_uv->flags &= ~XPC_P_ENGAGED_UV;
1294         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1295 }
1296
1297 static int
1298 xpc_partition_engaged_uv(short partid)
1299 {
1300         return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1301 }
1302
1303 static int
1304 xpc_any_partition_engaged_uv(void)
1305 {
1306         struct xpc_partition_uv *part_uv;
1307         short partid;
1308
1309         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1310                 part_uv = &xpc_partitions[partid].sn.uv;
1311                 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1312                         return 1;
1313         }
1314         return 0;
1315 }
1316
1317 static enum xp_retval
1318 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1319                          struct xpc_send_msg_slot_uv **address_of_msg_slot)
1320 {
1321         enum xp_retval ret;
1322         struct xpc_send_msg_slot_uv *msg_slot;
1323         struct xpc_fifo_entry_uv *entry;
1324
1325         while (1) {
1326                 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1327                 if (entry != NULL)
1328                         break;
1329
1330                 if (flags & XPC_NOWAIT)
1331                         return xpNoWait;
1332
1333                 ret = xpc_allocate_msg_wait(ch);
1334                 if (ret != xpInterrupted && ret != xpTimeout)
1335                         return ret;
1336         }
1337
1338         msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1339         *address_of_msg_slot = msg_slot;
1340         return xpSuccess;
1341 }
1342
1343 static void
1344 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1345                      struct xpc_send_msg_slot_uv *msg_slot)
1346 {
1347         xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1348
1349         /* wakeup anyone waiting for a free msg slot */
1350         if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1351                 wake_up(&ch->msg_allocate_wq);
1352 }
1353
1354 static void
1355 xpc_notify_sender_uv(struct xpc_channel *ch,
1356                      struct xpc_send_msg_slot_uv *msg_slot,
1357                      enum xp_retval reason)
1358 {
1359         xpc_notify_func func = msg_slot->func;
1360
1361         if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1362
1363                 atomic_dec(&ch->n_to_notify);
1364
1365                 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1366                         "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1367                         msg_slot->msg_slot_number, ch->partid, ch->number);
1368
1369                 func(reason, ch->partid, ch->number, msg_slot->key);
1370
1371                 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1372                         "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1373                         msg_slot->msg_slot_number, ch->partid, ch->number);
1374         }
1375 }
1376
1377 static void
1378 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1379                             struct xpc_notify_mq_msg_uv *msg)
1380 {
1381         struct xpc_send_msg_slot_uv *msg_slot;
1382         int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1383
1384         msg_slot = &ch->sn.uv.send_msg_slots[entry];
1385
1386         BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1387         msg_slot->msg_slot_number += ch->local_nentries;
1388
1389         if (msg_slot->func != NULL)
1390                 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1391
1392         xpc_free_msg_slot_uv(ch, msg_slot);
1393 }
1394
1395 static void
1396 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1397                             struct xpc_notify_mq_msg_uv *msg)
1398 {
1399         struct xpc_partition_uv *part_uv = &part->sn.uv;
1400         struct xpc_channel *ch;
1401         struct xpc_channel_uv *ch_uv;
1402         struct xpc_notify_mq_msg_uv *msg_slot;
1403         unsigned long irq_flags;
1404         int ch_number = msg->hdr.ch_number;
1405
1406         if (unlikely(ch_number >= part->nchannels)) {
1407                 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1408                         "channel number=0x%x in message from partid=%d\n",
1409                         ch_number, XPC_PARTID(part));
1410
1411                 /* get hb checker to deactivate from the remote partition */
1412                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1413                 if (part_uv->act_state_req == 0)
1414                         xpc_activate_IRQ_rcvd++;
1415                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1416                 part_uv->reason = xpBadChannelNumber;
1417                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1418
1419                 wake_up_interruptible(&xpc_activate_IRQ_wq);
1420                 return;
1421         }
1422
1423         ch = &part->channels[ch_number];
1424         xpc_msgqueue_ref(ch);
1425
1426         if (!(ch->flags & XPC_C_CONNECTED)) {
1427                 xpc_msgqueue_deref(ch);
1428                 return;
1429         }
1430
1431         /* see if we're really dealing with an ACK for a previously sent msg */
1432         if (msg->hdr.size == 0) {
1433                 xpc_handle_notify_mq_ack_uv(ch, msg);
1434                 xpc_msgqueue_deref(ch);
1435                 return;
1436         }
1437
1438         /* we're dealing with a normal message sent via the notify_mq */
1439         ch_uv = &ch->sn.uv;
1440
1441         msg_slot = ch_uv->recv_msg_slots +
1442             (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1443
1444         BUG_ON(msg->hdr.msg_slot_number != msg_slot->hdr.msg_slot_number);
1445         BUG_ON(msg_slot->hdr.size != 0);
1446
1447         memcpy(msg_slot, msg, msg->hdr.size);
1448
1449         xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1450
1451         if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1452                 /*
1453                  * If there is an existing idle kthread get it to deliver
1454                  * the payload, otherwise we'll have to get the channel mgr
1455                  * for this partition to create a kthread to do the delivery.
1456                  */
1457                 if (atomic_read(&ch->kthreads_idle) > 0)
1458                         wake_up_nr(&ch->idle_wq, 1);
1459                 else
1460                         xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1461         }
1462         xpc_msgqueue_deref(ch);
1463 }
1464
1465 static irqreturn_t
1466 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1467 {
1468         struct xpc_notify_mq_msg_uv *msg;
1469         short partid;
1470         struct xpc_partition *part;
1471
1472         while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1473                NULL) {
1474
1475                 partid = msg->hdr.partid;
1476                 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1477                         dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1478                                 "invalid partid=0x%x in message\n", partid);
1479                 } else {
1480                         part = &xpc_partitions[partid];
1481
1482                         if (xpc_part_ref(part)) {
1483                                 xpc_handle_notify_mq_msg_uv(part, msg);
1484                                 xpc_part_deref(part);
1485                         }
1486                 }
1487
1488                 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1489         }
1490
1491         return IRQ_HANDLED;
1492 }
1493
1494 static int
1495 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1496 {
1497         return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1498 }
1499
1500 static void
1501 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1502 {
1503         struct xpc_channel *ch = &part->channels[ch_number];
1504         int ndeliverable_payloads;
1505
1506         xpc_msgqueue_ref(ch);
1507
1508         ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1509
1510         if (ndeliverable_payloads > 0 &&
1511             (ch->flags & XPC_C_CONNECTED) &&
1512             (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1513
1514                 xpc_activate_kthreads(ch, ndeliverable_payloads);
1515         }
1516
1517         xpc_msgqueue_deref(ch);
1518 }
1519
1520 static enum xp_retval
1521 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1522                     u16 payload_size, u8 notify_type, xpc_notify_func func,
1523                     void *key)
1524 {
1525         enum xp_retval ret = xpSuccess;
1526         struct xpc_send_msg_slot_uv *msg_slot = NULL;
1527         struct xpc_notify_mq_msg_uv *msg;
1528         u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1529         size_t msg_size;
1530
1531         DBUG_ON(notify_type != XPC_N_CALL);
1532
1533         msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1534         if (msg_size > ch->entry_size)
1535                 return xpPayloadTooBig;
1536
1537         xpc_msgqueue_ref(ch);
1538
1539         if (ch->flags & XPC_C_DISCONNECTING) {
1540                 ret = ch->reason;
1541                 goto out_1;
1542         }
1543         if (!(ch->flags & XPC_C_CONNECTED)) {
1544                 ret = xpNotConnected;
1545                 goto out_1;
1546         }
1547
1548         ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1549         if (ret != xpSuccess)
1550                 goto out_1;
1551
1552         if (func != NULL) {
1553                 atomic_inc(&ch->n_to_notify);
1554
1555                 msg_slot->key = key;
1556                 smp_wmb(); /* a non-NULL func must hit memory after the key */
1557                 msg_slot->func = func;
1558
1559                 if (ch->flags & XPC_C_DISCONNECTING) {
1560                         ret = ch->reason;
1561                         goto out_2;
1562                 }
1563         }
1564
1565         msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1566         msg->hdr.partid = xp_partition_id;
1567         msg->hdr.ch_number = ch->number;
1568         msg->hdr.size = msg_size;
1569         msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1570         memcpy(&msg->payload, payload, payload_size);
1571
1572         ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1573                                msg_size);
1574         if (ret == xpSuccess)
1575                 goto out_1;
1576
1577         XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1578 out_2:
1579         if (func != NULL) {
1580                 /*
1581                  * Try to NULL the msg_slot's func field. If we fail, then
1582                  * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1583                  * case we need to pretend we succeeded to send the message
1584                  * since the user will get a callout for the disconnect error
1585                  * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1586                  * error returned here will confuse them. Additionally, since
1587                  * in this case the channel is being disconnected we don't need
1588                  * to put the the msg_slot back on the free list.
1589                  */
1590                 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1591                         ret = xpSuccess;
1592                         goto out_1;
1593                 }
1594
1595                 msg_slot->key = NULL;
1596                 atomic_dec(&ch->n_to_notify);
1597         }
1598         xpc_free_msg_slot_uv(ch, msg_slot);
1599 out_1:
1600         xpc_msgqueue_deref(ch);
1601         return ret;
1602 }
1603
1604 /*
1605  * Tell the callers of xpc_send_notify() that the status of their payloads
1606  * is unknown because the channel is now disconnecting.
1607  *
1608  * We don't worry about putting these msg_slots on the free list since the
1609  * msg_slots themselves are about to be kfree'd.
1610  */
1611 static void
1612 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1613 {
1614         struct xpc_send_msg_slot_uv *msg_slot;
1615         int entry;
1616
1617         DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1618
1619         for (entry = 0; entry < ch->local_nentries; entry++) {
1620
1621                 if (atomic_read(&ch->n_to_notify) == 0)
1622                         break;
1623
1624                 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1625                 if (msg_slot->func != NULL)
1626                         xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1627         }
1628 }
1629
1630 /*
1631  * Get the next deliverable message's payload.
1632  */
1633 static void *
1634 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1635 {
1636         struct xpc_fifo_entry_uv *entry;
1637         struct xpc_notify_mq_msg_uv *msg;
1638         void *payload = NULL;
1639
1640         if (!(ch->flags & XPC_C_DISCONNECTING)) {
1641                 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1642                 if (entry != NULL) {
1643                         msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1644                                            hdr.u.next);
1645                         payload = &msg->payload;
1646                 }
1647         }
1648         return payload;
1649 }
1650
1651 static void
1652 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1653 {
1654         struct xpc_notify_mq_msg_uv *msg;
1655         enum xp_retval ret;
1656
1657         msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1658
1659         /* return an ACK to the sender of this message */
1660
1661         msg->hdr.partid = xp_partition_id;
1662         msg->hdr.size = 0;      /* size of zero indicates this is an ACK */
1663
1664         ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1665                                sizeof(struct xpc_notify_mq_msghdr_uv));
1666         if (ret != xpSuccess)
1667                 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1668
1669         msg->hdr.msg_slot_number += ch->remote_nentries;
1670 }
1671
1672 int
1673 xpc_init_uv(void)
1674 {
1675         xpc_setup_partitions_sn = xpc_setup_partitions_sn_uv;
1676         xpc_teardown_partitions_sn = xpc_teardown_partitions_sn_uv;
1677         xpc_process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv;
1678         xpc_get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv;
1679         xpc_setup_rsvd_page_sn = xpc_setup_rsvd_page_sn_uv;
1680         xpc_increment_heartbeat = xpc_increment_heartbeat_uv;
1681         xpc_offline_heartbeat = xpc_offline_heartbeat_uv;
1682         xpc_online_heartbeat = xpc_online_heartbeat_uv;
1683         xpc_heartbeat_init = xpc_heartbeat_init_uv;
1684         xpc_heartbeat_exit = xpc_heartbeat_exit_uv;
1685         xpc_get_remote_heartbeat = xpc_get_remote_heartbeat_uv;
1686
1687         xpc_request_partition_activation = xpc_request_partition_activation_uv;
1688         xpc_request_partition_reactivation =
1689             xpc_request_partition_reactivation_uv;
1690         xpc_request_partition_deactivation =
1691             xpc_request_partition_deactivation_uv;
1692         xpc_cancel_partition_deactivation_request =
1693             xpc_cancel_partition_deactivation_request_uv;
1694
1695         xpc_setup_ch_structures_sn = xpc_setup_ch_structures_sn_uv;
1696         xpc_teardown_ch_structures_sn = xpc_teardown_ch_structures_sn_uv;
1697
1698         xpc_make_first_contact = xpc_make_first_contact_uv;
1699
1700         xpc_get_chctl_all_flags = xpc_get_chctl_all_flags_uv;
1701         xpc_send_chctl_closerequest = xpc_send_chctl_closerequest_uv;
1702         xpc_send_chctl_closereply = xpc_send_chctl_closereply_uv;
1703         xpc_send_chctl_openrequest = xpc_send_chctl_openrequest_uv;
1704         xpc_send_chctl_openreply = xpc_send_chctl_openreply_uv;
1705
1706         xpc_save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv;
1707
1708         xpc_setup_msg_structures = xpc_setup_msg_structures_uv;
1709         xpc_teardown_msg_structures = xpc_teardown_msg_structures_uv;
1710
1711         xpc_indicate_partition_engaged = xpc_indicate_partition_engaged_uv;
1712         xpc_indicate_partition_disengaged =
1713             xpc_indicate_partition_disengaged_uv;
1714         xpc_assume_partition_disengaged = xpc_assume_partition_disengaged_uv;
1715         xpc_partition_engaged = xpc_partition_engaged_uv;
1716         xpc_any_partition_engaged = xpc_any_partition_engaged_uv;
1717
1718         xpc_n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv;
1719         xpc_process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv;
1720         xpc_send_payload = xpc_send_payload_uv;
1721         xpc_notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv;
1722         xpc_get_deliverable_payload = xpc_get_deliverable_payload_uv;
1723         xpc_received_payload = xpc_received_payload_uv;
1724
1725         if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1726                 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1727                         XPC_MSG_HDR_MAX_SIZE);
1728                 return -E2BIG;
1729         }
1730
1731         xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0,
1732                                                   XPC_ACTIVATE_IRQ_NAME,
1733                                                   xpc_handle_activate_IRQ_uv);
1734         if (IS_ERR(xpc_activate_mq_uv))
1735                 return PTR_ERR(xpc_activate_mq_uv);
1736
1737         xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0,
1738                                                 XPC_NOTIFY_IRQ_NAME,
1739                                                 xpc_handle_notify_IRQ_uv);
1740         if (IS_ERR(xpc_notify_mq_uv)) {
1741                 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1742                 return PTR_ERR(xpc_notify_mq_uv);
1743         }
1744
1745         return 0;
1746 }
1747
1748 void
1749 xpc_exit_uv(void)
1750 {
1751         xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1752         xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1753 }