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x86: uv: xpc NULL deref when mesq becomes empty
[linux-2.6.git] / drivers / misc / sgi-xp / xpc_uv.c
blob19bd7b0ede91d7282e42f2e7e5255f750a5f334a
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 struct xpc_heartbeat_uv *xpc_heartbeat_uv;
50
51 #define XPC_ACTIVATE_MSG_SIZE_UV (1 * GRU_CACHE_LINE_BYTES)
52 #define XPC_ACTIVATE_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
53 XPC_ACTIVATE_MSG_SIZE_UV)
54 #define XPC_ACTIVATE_IRQ_NAME "xpc_activate"
55
56 #define XPC_NOTIFY_MSG_SIZE_UV (2 * GRU_CACHE_LINE_BYTES)
57 #define XPC_NOTIFY_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
58 XPC_NOTIFY_MSG_SIZE_UV)
59 #define XPC_NOTIFY_IRQ_NAME "xpc_notify"
60
61 static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
62 static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
63
64 static int
65 xpc_setup_partitions_uv(void)
66 {
67 short partid;
68 struct xpc_partition_uv *part_uv;
69
70 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
71 part_uv = &xpc_partitions[partid].sn.uv;
72
73 mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
74 spin_lock_init(&part_uv->flags_lock);
75 part_uv->remote_act_state = XPC_P_AS_INACTIVE;
76 }
77 return 0;
78 }
79
80 static void
81 xpc_teardown_partitions_uv(void)
82 {
83 short partid;
84 struct xpc_partition_uv *part_uv;
85 unsigned long irq_flags;
86
87 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
88 part_uv = &xpc_partitions[partid].sn.uv;
89
90 if (part_uv->cached_activate_gru_mq_desc != NULL) {
91 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
92 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
93 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
94 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
95 kfree(part_uv->cached_activate_gru_mq_desc);
96 part_uv->cached_activate_gru_mq_desc = NULL;
97 mutex_unlock(&part_uv->
98 cached_activate_gru_mq_desc_mutex);
99 }
100 }
101 }
102
103 static int
104 xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
105 {
106 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
107
108 #if defined CONFIG_X86_64
109 mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
110 UV_AFFINITY_CPU);
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);
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_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
161 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
162
163 ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
164 mq->order, &mq->mmr_offset);
165 if (ret < 0) {
166 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
167 ret);
168 return -EBUSY;
169 }
170 #elif defined CONFIG_X86_64
171 ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
172 mq->order, &mq->mmr_offset);
173 if (ret < 0) {
174 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
175 "ret=%d\n", ret);
176 return ret;
177 }
178 #else
179 #error not a supported configuration
180 #endif
181
182 mq->watchlist_num = ret;
183 return 0;
184 }
185
186 static void
187 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
188 {
189 int ret;
190 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
191
192 #if defined CONFIG_X86_64
193 ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
194 BUG_ON(ret != BIOS_STATUS_SUCCESS);
195 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
196 ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
197 BUG_ON(ret != SALRET_OK);
198 #else
199 #error not a supported configuration
200 #endif
201 }
202
203 static struct xpc_gru_mq_uv *
204 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
205 irq_handler_t irq_handler)
206 {
207 enum xp_retval xp_ret;
208 int ret;
209 int nid;
210 int pg_order;
211 struct page *page;
212 struct xpc_gru_mq_uv *mq;
213 struct uv_IO_APIC_route_entry *mmr_value;
214
215 mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
216 if (mq == NULL) {
217 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
218 "a xpc_gru_mq_uv structure\n");
219 ret = -ENOMEM;
220 goto out_0;
221 }
222
223 mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
224 GFP_KERNEL);
225 if (mq->gru_mq_desc == NULL) {
226 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
227 "a gru_message_queue_desc structure\n");
228 ret = -ENOMEM;
229 goto out_1;
230 }
231
232 pg_order = get_order(mq_size);
233 mq->order = pg_order + PAGE_SHIFT;
234 mq_size = 1UL << mq->order;
235
236 mq->mmr_blade = uv_cpu_to_blade_id(cpu);
237
238 nid = cpu_to_node(cpu);
239 page = alloc_pages_exact_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
240 pg_order);
241 if (page == NULL) {
242 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
243 "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
244 ret = -ENOMEM;
245 goto out_2;
246 }
247 mq->address = page_address(page);
248
249 /* enable generation of irq when GRU mq operation occurs to this mq */
250 ret = xpc_gru_mq_watchlist_alloc_uv(mq);
251 if (ret != 0)
252 goto out_3;
253
254 ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
255 if (ret != 0)
256 goto out_4;
257
258 ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
259 if (ret != 0) {
260 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
261 mq->irq, -ret);
262 goto out_5;
263 }
264
265 mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
266 ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
267 nid, mmr_value->vector, mmr_value->dest);
268 if (ret != 0) {
269 dev_err(xpc_part, "gru_create_message_queue() returned "
270 "error=%d\n", ret);
271 ret = -EINVAL;
272 goto out_6;
273 }
274
275 /* allow other partitions to access this GRU mq */
276 xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
277 if (xp_ret != xpSuccess) {
278 ret = -EACCES;
279 goto out_6;
280 }
281
282 return mq;
283
284 /* something went wrong */
285 out_6:
286 free_irq(mq->irq, NULL);
287 out_5:
288 xpc_release_gru_mq_irq_uv(mq);
289 out_4:
290 xpc_gru_mq_watchlist_free_uv(mq);
291 out_3:
292 free_pages((unsigned long)mq->address, pg_order);
293 out_2:
294 kfree(mq->gru_mq_desc);
295 out_1:
296 kfree(mq);
297 out_0:
298 return ERR_PTR(ret);
299 }
300
301 static void
302 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
303 {
304 unsigned int mq_size;
305 int pg_order;
306 int ret;
307
308 /* disallow other partitions to access GRU mq */
309 mq_size = 1UL << mq->order;
310 ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
311 BUG_ON(ret != xpSuccess);
312
313 /* unregister irq handler and release mq irq/vector mapping */
314 free_irq(mq->irq, NULL);
315 xpc_release_gru_mq_irq_uv(mq);
316
317 /* disable generation of irq when GRU mq op occurs to this mq */
318 xpc_gru_mq_watchlist_free_uv(mq);
319
320 pg_order = mq->order - PAGE_SHIFT;
321 free_pages((unsigned long)mq->address, pg_order);
322
323 kfree(mq);
324 }
325
326 static enum xp_retval
327 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
328 size_t msg_size)
329 {
330 enum xp_retval xp_ret;
331 int ret;
332
333 while (1) {
334 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
335 if (ret == MQE_OK) {
336 xp_ret = xpSuccess;
337 break;
338 }
339
340 if (ret == MQE_QUEUE_FULL) {
341 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
342 "error=MQE_QUEUE_FULL\n");
343 /* !!! handle QLimit reached; delay & try again */
344 /* ??? Do we add a limit to the number of retries? */
345 (void)msleep_interruptible(10);
346 } else if (ret == MQE_CONGESTION) {
347 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
348 "error=MQE_CONGESTION\n");
349 /* !!! handle LB Overflow; simply try again */
350 /* ??? Do we add a limit to the number of retries? */
351 } else {
352 /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
353 dev_err(xpc_chan, "gru_send_message_gpa() returned "
354 "error=%d\n", ret);
355 xp_ret = xpGruSendMqError;
356 break;
357 }
358 }
359 return xp_ret;
360 }
361
362 static void
363 xpc_process_activate_IRQ_rcvd_uv(void)
364 {
365 unsigned long irq_flags;
366 short partid;
367 struct xpc_partition *part;
368 u8 act_state_req;
369
370 DBUG_ON(xpc_activate_IRQ_rcvd == 0);
371
372 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
373 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
374 part = &xpc_partitions[partid];
375
376 if (part->sn.uv.act_state_req == 0)
377 continue;
378
379 xpc_activate_IRQ_rcvd--;
380 BUG_ON(xpc_activate_IRQ_rcvd < 0);
381
382 act_state_req = part->sn.uv.act_state_req;
383 part->sn.uv.act_state_req = 0;
384 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
385
386 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
387 if (part->act_state == XPC_P_AS_INACTIVE)
388 xpc_activate_partition(part);
389 else if (part->act_state == XPC_P_AS_DEACTIVATING)
390 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
391
392 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
393 if (part->act_state == XPC_P_AS_INACTIVE)
394 xpc_activate_partition(part);
395 else
396 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
397
398 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
399 XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
400
401 } else {
402 BUG();
403 }
404
405 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
406 if (xpc_activate_IRQ_rcvd == 0)
407 break;
408 }
409 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
410
411 }
412
413 static void
414 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
415 struct xpc_activate_mq_msghdr_uv *msg_hdr,
416 int *wakeup_hb_checker)
417 {
418 unsigned long irq_flags;
419 struct xpc_partition_uv *part_uv = &part->sn.uv;
420 struct xpc_openclose_args *args;
421
422 part_uv->remote_act_state = msg_hdr->act_state;
423
424 switch (msg_hdr->type) {
425 case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
426 /* syncing of remote_act_state was just done above */
427 break;
428
429 case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
430 struct xpc_activate_mq_msg_activate_req_uv *msg;
431
432 /*
433 * ??? Do we deal here with ts_jiffies being different
434 * ??? if act_state != XPC_P_AS_INACTIVE instead of
435 * ??? below?
436 */
437 msg = container_of(msg_hdr, struct
438 xpc_activate_mq_msg_activate_req_uv, hdr);
439
440 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
441 if (part_uv->act_state_req == 0)
442 xpc_activate_IRQ_rcvd++;
443 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
444 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
445 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
446 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
447
448 if (msg->activate_gru_mq_desc_gpa !=
449 part_uv->activate_gru_mq_desc_gpa) {
450 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
451 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
452 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
453 part_uv->activate_gru_mq_desc_gpa =
454 msg->activate_gru_mq_desc_gpa;
455 }
456 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
457
458 (*wakeup_hb_checker)++;
459 break;
460 }
461 case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
462 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
463
464 msg = container_of(msg_hdr, struct
465 xpc_activate_mq_msg_deactivate_req_uv, hdr);
466
467 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
468 if (part_uv->act_state_req == 0)
469 xpc_activate_IRQ_rcvd++;
470 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
471 part_uv->reason = msg->reason;
472 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
473
474 (*wakeup_hb_checker)++;
475 return;
476 }
477 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
478 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
479
480 msg = container_of(msg_hdr, struct
481 xpc_activate_mq_msg_chctl_closerequest_uv,
482 hdr);
483 args = &part->remote_openclose_args[msg->ch_number];
484 args->reason = msg->reason;
485
486 spin_lock_irqsave(&part->chctl_lock, irq_flags);
487 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
488 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
489
490 xpc_wakeup_channel_mgr(part);
491 break;
492 }
493 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
494 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
495
496 msg = container_of(msg_hdr, struct
497 xpc_activate_mq_msg_chctl_closereply_uv,
498 hdr);
499
500 spin_lock_irqsave(&part->chctl_lock, irq_flags);
501 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
502 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
503
504 xpc_wakeup_channel_mgr(part);
505 break;
506 }
507 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
508 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
509
510 msg = container_of(msg_hdr, struct
511 xpc_activate_mq_msg_chctl_openrequest_uv,
512 hdr);
513 args = &part->remote_openclose_args[msg->ch_number];
514 args->entry_size = msg->entry_size;
515 args->local_nentries = msg->local_nentries;
516
517 spin_lock_irqsave(&part->chctl_lock, irq_flags);
518 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
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_OPENREPLY_UV: {
525 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
526
527 msg = container_of(msg_hdr, struct
528 xpc_activate_mq_msg_chctl_openreply_uv, hdr);
529 args = &part->remote_openclose_args[msg->ch_number];
530 args->remote_nentries = msg->remote_nentries;
531 args->local_nentries = msg->local_nentries;
532 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
533
534 spin_lock_irqsave(&part->chctl_lock, irq_flags);
535 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
536 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
537
538 xpc_wakeup_channel_mgr(part);
539 break;
540 }
541 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
542 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
543
544 msg = container_of(msg_hdr, struct
545 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
546 spin_lock_irqsave(&part->chctl_lock, irq_flags);
547 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
548 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
549
550 xpc_wakeup_channel_mgr(part);
551 }
552 case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
553 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
554 part_uv->flags |= XPC_P_ENGAGED_UV;
555 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
556 break;
557
558 case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
559 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
560 part_uv->flags &= ~XPC_P_ENGAGED_UV;
561 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
562 break;
563
564 default:
565 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
566 "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
567
568 /* get hb checker to deactivate from the remote partition */
569 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
570 if (part_uv->act_state_req == 0)
571 xpc_activate_IRQ_rcvd++;
572 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
573 part_uv->reason = xpBadMsgType;
574 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
575
576 (*wakeup_hb_checker)++;
577 return;
578 }
579
580 if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
581 part->remote_rp_ts_jiffies != 0) {
582 /*
583 * ??? Does what we do here need to be sensitive to
584 * ??? act_state or remote_act_state?
585 */
586 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
587 if (part_uv->act_state_req == 0)
588 xpc_activate_IRQ_rcvd++;
589 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
590 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
591
592 (*wakeup_hb_checker)++;
593 }
594 }
595
596 static irqreturn_t
597 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
598 {
599 struct xpc_activate_mq_msghdr_uv *msg_hdr;
600 short partid;
601 struct xpc_partition *part;
602 int wakeup_hb_checker = 0;
603 int part_referenced;
604
605 while (1) {
606 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
607 if (msg_hdr == NULL)
608 break;
609
610 partid = msg_hdr->partid;
611 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
612 dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
613 "received invalid partid=0x%x in message\n",
614 partid);
615 } else {
616 part = &xpc_partitions[partid];
617
618 part_referenced = xpc_part_ref(part);
619 xpc_handle_activate_mq_msg_uv(part, msg_hdr,
620 &wakeup_hb_checker);
621 if (part_referenced)
622 xpc_part_deref(part);
623 }
624
625 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
626 }
627
628 if (wakeup_hb_checker)
629 wake_up_interruptible(&xpc_activate_IRQ_wq);
630
631 return IRQ_HANDLED;
632 }
633
634 static enum xp_retval
635 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
636 unsigned long gru_mq_desc_gpa)
637 {
638 enum xp_retval ret;
639
640 ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
641 sizeof(struct gru_message_queue_desc));
642 if (ret == xpSuccess)
643 gru_mq_desc->mq = NULL;
644
645 return ret;
646 }
647
648 static enum xp_retval
649 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
650 int msg_type)
651 {
652 struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
653 struct xpc_partition_uv *part_uv = &part->sn.uv;
654 struct gru_message_queue_desc *gru_mq_desc;
655 unsigned long irq_flags;
656 enum xp_retval ret;
657
658 DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
659
660 msg_hdr->type = msg_type;
661 msg_hdr->partid = xp_partition_id;
662 msg_hdr->act_state = part->act_state;
663 msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
664
665 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
666 again:
667 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
668 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
669 if (gru_mq_desc == NULL) {
670 gru_mq_desc = kmalloc(sizeof(struct
671 gru_message_queue_desc),
672 GFP_KERNEL);
673 if (gru_mq_desc == NULL) {
674 ret = xpNoMemory;
675 goto done;
676 }
677 part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
678 }
679
680 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
681 part_uv->
682 activate_gru_mq_desc_gpa);
683 if (ret != xpSuccess)
684 goto done;
685
686 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
687 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
688 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
689 }
690
691 /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
692 ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
693 msg_size);
694 if (ret != xpSuccess) {
695 smp_rmb(); /* ensure a fresh copy of part_uv->flags */
696 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
697 goto again;
698 }
699 done:
700 mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
701 return ret;
702 }
703
704 static void
705 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
706 size_t msg_size, int msg_type)
707 {
708 enum xp_retval ret;
709
710 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
711 if (unlikely(ret != xpSuccess))
712 XPC_DEACTIVATE_PARTITION(part, ret);
713 }
714
715 static void
716 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
717 void *msg, size_t msg_size, int msg_type)
718 {
719 struct xpc_partition *part = &xpc_partitions[ch->partid];
720 enum xp_retval ret;
721
722 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
723 if (unlikely(ret != xpSuccess)) {
724 if (irq_flags != NULL)
725 spin_unlock_irqrestore(&ch->lock, *irq_flags);
726
727 XPC_DEACTIVATE_PARTITION(part, ret);
728
729 if (irq_flags != NULL)
730 spin_lock_irqsave(&ch->lock, *irq_flags);
731 }
732 }
733
734 static void
735 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
736 {
737 unsigned long irq_flags;
738 struct xpc_partition_uv *part_uv = &part->sn.uv;
739
740 /*
741 * !!! Make our side think that the remote partition sent an activate
742 * !!! mq message our way by doing what the activate IRQ handler would
743 * !!! do had one really been sent.
744 */
745
746 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
747 if (part_uv->act_state_req == 0)
748 xpc_activate_IRQ_rcvd++;
749 part_uv->act_state_req = act_state_req;
750 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
751
752 wake_up_interruptible(&xpc_activate_IRQ_wq);
753 }
754
755 static enum xp_retval
756 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
757 size_t *len)
758 {
759 s64 status;
760 enum xp_retval ret;
761
762 #if defined CONFIG_X86_64
763 status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
764 (u64 *)len);
765 if (status == BIOS_STATUS_SUCCESS)
766 ret = xpSuccess;
767 else if (status == BIOS_STATUS_MORE_PASSES)
768 ret = xpNeedMoreInfo;
769 else
770 ret = xpBiosError;
771
772 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
773 status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
774 if (status == SALRET_OK)
775 ret = xpSuccess;
776 else if (status == SALRET_MORE_PASSES)
777 ret = xpNeedMoreInfo;
778 else
779 ret = xpSalError;
780
781 #else
782 #error not a supported configuration
783 #endif
784
785 return ret;
786 }
787
788 static int
789 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
790 {
791 xpc_heartbeat_uv =
792 &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
793 rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
794 rp->sn.uv.activate_gru_mq_desc_gpa =
795 uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
796 return 0;
797 }
798
799 static void
800 xpc_allow_hb_uv(short partid)
801 {
802 }
803
804 static void
805 xpc_disallow_hb_uv(short partid)
806 {
807 }
808
809 static void
810 xpc_disallow_all_hbs_uv(void)
811 {
812 }
813
814 static void
815 xpc_increment_heartbeat_uv(void)
816 {
817 xpc_heartbeat_uv->value++;
818 }
819
820 static void
821 xpc_offline_heartbeat_uv(void)
822 {
823 xpc_increment_heartbeat_uv();
824 xpc_heartbeat_uv->offline = 1;
825 }
826
827 static void
828 xpc_online_heartbeat_uv(void)
829 {
830 xpc_increment_heartbeat_uv();
831 xpc_heartbeat_uv->offline = 0;
832 }
833
834 static void
835 xpc_heartbeat_init_uv(void)
836 {
837 xpc_heartbeat_uv->value = 1;
838 xpc_heartbeat_uv->offline = 0;
839 }
840
841 static void
842 xpc_heartbeat_exit_uv(void)
843 {
844 xpc_offline_heartbeat_uv();
845 }
846
847 static enum xp_retval
848 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
849 {
850 struct xpc_partition_uv *part_uv = &part->sn.uv;
851 enum xp_retval ret;
852
853 ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
854 part_uv->heartbeat_gpa,
855 sizeof(struct xpc_heartbeat_uv));
856 if (ret != xpSuccess)
857 return ret;
858
859 if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
860 !part_uv->cached_heartbeat.offline) {
861
862 ret = xpNoHeartbeat;
863 } else {
864 part->last_heartbeat = part_uv->cached_heartbeat.value;
865 }
866 return ret;
867 }
868
869 static void
870 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
871 unsigned long remote_rp_gpa, int nasid)
872 {
873 short partid = remote_rp->SAL_partid;
874 struct xpc_partition *part = &xpc_partitions[partid];
875 struct xpc_activate_mq_msg_activate_req_uv msg;
876
877 part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
878 part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
879 part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
880 part->sn.uv.activate_gru_mq_desc_gpa =
881 remote_rp->sn.uv.activate_gru_mq_desc_gpa;
882
883 /*
884 * ??? Is it a good idea to make this conditional on what is
885 * ??? potentially stale state information?
886 */
887 if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
888 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
889 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
890 msg.activate_gru_mq_desc_gpa =
891 xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
892 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
893 XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
894 }
895
896 if (part->act_state == XPC_P_AS_INACTIVE)
897 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
898 }
899
900 static void
901 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
902 {
903 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
904 }
905
906 static void
907 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
908 {
909 struct xpc_activate_mq_msg_deactivate_req_uv msg;
910
911 /*
912 * ??? Is it a good idea to make this conditional on what is
913 * ??? potentially stale state information?
914 */
915 if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
916 part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
917
918 msg.reason = part->reason;
919 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
920 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
921 }
922 }
923
924 static void
925 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
926 {
927 /* nothing needs to be done */
928 return;
929 }
930
931 static void
932 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
933 {
934 head->first = NULL;
935 head->last = NULL;
936 spin_lock_init(&head->lock);
937 head->n_entries = 0;
938 }
939
940 static void *
941 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
942 {
943 unsigned long irq_flags;
944 struct xpc_fifo_entry_uv *first;
945
946 spin_lock_irqsave(&head->lock, irq_flags);
947 first = head->first;
948 if (head->first != NULL) {
949 head->first = first->next;
950 if (head->first == NULL)
951 head->last = NULL;
952
953 head->n_entries--;
954 BUG_ON(head->n_entries < 0);
955
956 first->next = NULL;
957 }
958 spin_unlock_irqrestore(&head->lock, irq_flags);
959 return first;
960 }
961
962 static void
963 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
964 struct xpc_fifo_entry_uv *last)
965 {
966 unsigned long irq_flags;
967
968 last->next = NULL;
969 spin_lock_irqsave(&head->lock, irq_flags);
970 if (head->last != NULL)
971 head->last->next = last;
972 else
973 head->first = last;
974 head->last = last;
975 head->n_entries++;
976 spin_unlock_irqrestore(&head->lock, irq_flags);
977 }
978
979 static int
980 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
981 {
982 return head->n_entries;
983 }
984
985 /*
986 * Setup the channel structures that are uv specific.
987 */
988 static enum xp_retval
989 xpc_setup_ch_structures_uv(struct xpc_partition *part)
990 {
991 struct xpc_channel_uv *ch_uv;
992 int ch_number;
993
994 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
995 ch_uv = &part->channels[ch_number].sn.uv;
996
997 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
998 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
999 }
1000
1001 return xpSuccess;
1002 }
1003
1004 /*
1005 * Teardown the channel structures that are uv specific.
1006 */
1007 static void
1008 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1009 {
1010 /* nothing needs to be done */
1011 return;
1012 }
1013
1014 static enum xp_retval
1015 xpc_make_first_contact_uv(struct xpc_partition *part)
1016 {
1017 struct xpc_activate_mq_msg_uv msg;
1018
1019 /*
1020 * We send a sync msg to get the remote partition's remote_act_state
1021 * updated to our current act_state which at this point should
1022 * be XPC_P_AS_ACTIVATING.
1023 */
1024 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1025 XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1026
1027 while (part->sn.uv.remote_act_state != XPC_P_AS_ACTIVATING) {
1028
1029 dev_dbg(xpc_part, "waiting to make first contact with "
1030 "partition %d\n", XPC_PARTID(part));
1031
1032 /* wait a 1/4 of a second or so */
1033 (void)msleep_interruptible(250);
1034
1035 if (part->act_state == XPC_P_AS_DEACTIVATING)
1036 return part->reason;
1037 }
1038
1039 return xpSuccess;
1040 }
1041
1042 static u64
1043 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1044 {
1045 unsigned long irq_flags;
1046 union xpc_channel_ctl_flags chctl;
1047
1048 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1049 chctl = part->chctl;
1050 if (chctl.all_flags != 0)
1051 part->chctl.all_flags = 0;
1052
1053 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1054 return chctl.all_flags;
1055 }
1056
1057 static enum xp_retval
1058 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1059 {
1060 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1061 struct xpc_send_msg_slot_uv *msg_slot;
1062 unsigned long irq_flags;
1063 int nentries;
1064 int entry;
1065 size_t nbytes;
1066
1067 for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1068 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1069 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1070 if (ch_uv->send_msg_slots == NULL)
1071 continue;
1072
1073 for (entry = 0; entry < nentries; entry++) {
1074 msg_slot = &ch_uv->send_msg_slots[entry];
1075
1076 msg_slot->msg_slot_number = entry;
1077 xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1078 &msg_slot->next);
1079 }
1080
1081 spin_lock_irqsave(&ch->lock, irq_flags);
1082 if (nentries < ch->local_nentries)
1083 ch->local_nentries = nentries;
1084 spin_unlock_irqrestore(&ch->lock, irq_flags);
1085 return xpSuccess;
1086 }
1087
1088 return xpNoMemory;
1089 }
1090
1091 static enum xp_retval
1092 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1093 {
1094 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1095 struct xpc_notify_mq_msg_uv *msg_slot;
1096 unsigned long irq_flags;
1097 int nentries;
1098 int entry;
1099 size_t nbytes;
1100
1101 for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1102 nbytes = nentries * ch->entry_size;
1103 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1104 if (ch_uv->recv_msg_slots == NULL)
1105 continue;
1106
1107 for (entry = 0; entry < nentries; entry++) {
1108 msg_slot = ch_uv->recv_msg_slots +
1109 entry * ch->entry_size;
1110
1111 msg_slot->hdr.msg_slot_number = entry;
1112 }
1113
1114 spin_lock_irqsave(&ch->lock, irq_flags);
1115 if (nentries < ch->remote_nentries)
1116 ch->remote_nentries = nentries;
1117 spin_unlock_irqrestore(&ch->lock, irq_flags);
1118 return xpSuccess;
1119 }
1120
1121 return xpNoMemory;
1122 }
1123
1124 /*
1125 * Allocate msg_slots associated with the channel.
1126 */
1127 static enum xp_retval
1128 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1129 {
1130 static enum xp_retval ret;
1131 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1132
1133 DBUG_ON(ch->flags & XPC_C_SETUP);
1134
1135 ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1136 gru_message_queue_desc),
1137 GFP_KERNEL);
1138 if (ch_uv->cached_notify_gru_mq_desc == NULL)
1139 return xpNoMemory;
1140
1141 ret = xpc_allocate_send_msg_slot_uv(ch);
1142 if (ret == xpSuccess) {
1143
1144 ret = xpc_allocate_recv_msg_slot_uv(ch);
1145 if (ret != xpSuccess) {
1146 kfree(ch_uv->send_msg_slots);
1147 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1148 }
1149 }
1150 return ret;
1151 }
1152
1153 /*
1154 * Free up msg_slots and clear other stuff that were setup for the specified
1155 * channel.
1156 */
1157 static void
1158 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1159 {
1160 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1161
1162 DBUG_ON(!spin_is_locked(&ch->lock));
1163
1164 kfree(ch_uv->cached_notify_gru_mq_desc);
1165 ch_uv->cached_notify_gru_mq_desc = NULL;
1166
1167 if (ch->flags & XPC_C_SETUP) {
1168 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1169 kfree(ch_uv->send_msg_slots);
1170 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1171 kfree(ch_uv->recv_msg_slots);
1172 }
1173 }
1174
1175 static void
1176 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1177 {
1178 struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1179
1180 msg.ch_number = ch->number;
1181 msg.reason = ch->reason;
1182 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1183 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1184 }
1185
1186 static void
1187 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1188 {
1189 struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1190
1191 msg.ch_number = ch->number;
1192 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1193 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1194 }
1195
1196 static void
1197 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1198 {
1199 struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1200
1201 msg.ch_number = ch->number;
1202 msg.entry_size = ch->entry_size;
1203 msg.local_nentries = ch->local_nentries;
1204 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1205 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1206 }
1207
1208 static void
1209 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1210 {
1211 struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1212
1213 msg.ch_number = ch->number;
1214 msg.local_nentries = ch->local_nentries;
1215 msg.remote_nentries = ch->remote_nentries;
1216 msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1217 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1218 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1219 }
1220
1221 static void
1222 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1223 {
1224 struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1225
1226 msg.ch_number = ch->number;
1227 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1228 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1229 }
1230
1231 static void
1232 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1233 {
1234 unsigned long irq_flags;
1235
1236 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1237 part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1238 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1239
1240 xpc_wakeup_channel_mgr(part);
1241 }
1242
1243 static enum xp_retval
1244 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1245 unsigned long gru_mq_desc_gpa)
1246 {
1247 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1248
1249 DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1250 return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1251 gru_mq_desc_gpa);
1252 }
1253
1254 static void
1255 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1256 {
1257 struct xpc_activate_mq_msg_uv msg;
1258
1259 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1260 XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1261 }
1262
1263 static void
1264 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1265 {
1266 struct xpc_activate_mq_msg_uv msg;
1267
1268 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1269 XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1270 }
1271
1272 static void
1273 xpc_assume_partition_disengaged_uv(short partid)
1274 {
1275 struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1276 unsigned long irq_flags;
1277
1278 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1279 part_uv->flags &= ~XPC_P_ENGAGED_UV;
1280 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1281 }
1282
1283 static int
1284 xpc_partition_engaged_uv(short partid)
1285 {
1286 return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1287 }
1288
1289 static int
1290 xpc_any_partition_engaged_uv(void)
1291 {
1292 struct xpc_partition_uv *part_uv;
1293 short partid;
1294
1295 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1296 part_uv = &xpc_partitions[partid].sn.uv;
1297 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1298 return 1;
1299 }
1300 return 0;
1301 }
1302
1303 static enum xp_retval
1304 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1305 struct xpc_send_msg_slot_uv **address_of_msg_slot)
1306 {
1307 enum xp_retval ret;
1308 struct xpc_send_msg_slot_uv *msg_slot;
1309 struct xpc_fifo_entry_uv *entry;
1310
1311 while (1) {
1312 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1313 if (entry != NULL)
1314 break;
1315
1316 if (flags & XPC_NOWAIT)
1317 return xpNoWait;
1318
1319 ret = xpc_allocate_msg_wait(ch);
1320 if (ret != xpInterrupted && ret != xpTimeout)
1321 return ret;
1322 }
1323
1324 msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1325 *address_of_msg_slot = msg_slot;
1326 return xpSuccess;
1327 }
1328
1329 static void
1330 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1331 struct xpc_send_msg_slot_uv *msg_slot)
1332 {
1333 xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1334
1335 /* wakeup anyone waiting for a free msg slot */
1336 if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1337 wake_up(&ch->msg_allocate_wq);
1338 }
1339
1340 static void
1341 xpc_notify_sender_uv(struct xpc_channel *ch,
1342 struct xpc_send_msg_slot_uv *msg_slot,
1343 enum xp_retval reason)
1344 {
1345 xpc_notify_func func = msg_slot->func;
1346
1347 if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1348
1349 atomic_dec(&ch->n_to_notify);
1350
1351 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1352 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1353 msg_slot->msg_slot_number, ch->partid, ch->number);
1354
1355 func(reason, ch->partid, ch->number, msg_slot->key);
1356
1357 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1358 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1359 msg_slot->msg_slot_number, ch->partid, ch->number);
1360 }
1361 }
1362
1363 static void
1364 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1365 struct xpc_notify_mq_msg_uv *msg)
1366 {
1367 struct xpc_send_msg_slot_uv *msg_slot;
1368 int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1369
1370 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1371
1372 BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1373 msg_slot->msg_slot_number += ch->local_nentries;
1374
1375 if (msg_slot->func != NULL)
1376 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1377
1378 xpc_free_msg_slot_uv(ch, msg_slot);
1379 }
1380
1381 static void
1382 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1383 struct xpc_notify_mq_msg_uv *msg)
1384 {
1385 struct xpc_partition_uv *part_uv = &part->sn.uv;
1386 struct xpc_channel *ch;
1387 struct xpc_channel_uv *ch_uv;
1388 struct xpc_notify_mq_msg_uv *msg_slot;
1389 unsigned long irq_flags;
1390 int ch_number = msg->hdr.ch_number;
1391
1392 if (unlikely(ch_number >= part->nchannels)) {
1393 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1394 "channel number=0x%x in message from partid=%d\n",
1395 ch_number, XPC_PARTID(part));
1396
1397 /* get hb checker to deactivate from the remote partition */
1398 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1399 if (part_uv->act_state_req == 0)
1400 xpc_activate_IRQ_rcvd++;
1401 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1402 part_uv->reason = xpBadChannelNumber;
1403 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1404
1405 wake_up_interruptible(&xpc_activate_IRQ_wq);
1406 return;
1407 }
1408
1409 ch = &part->channels[ch_number];
1410 xpc_msgqueue_ref(ch);
1411
1412 if (!(ch->flags & XPC_C_CONNECTED)) {
1413 xpc_msgqueue_deref(ch);
1414 return;
1415 }
1416
1417 /* see if we're really dealing with an ACK for a previously sent msg */
1418 if (msg->hdr.size == 0) {
1419 xpc_handle_notify_mq_ack_uv(ch, msg);
1420 xpc_msgqueue_deref(ch);
1421 return;
1422 }
1423
1424 /* we're dealing with a normal message sent via the notify_mq */
1425 ch_uv = &ch->sn.uv;
1426
1427 msg_slot = ch_uv->recv_msg_slots +
1428 (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1429
1430 BUG_ON(msg->hdr.msg_slot_number != msg_slot->hdr.msg_slot_number);
1431 BUG_ON(msg_slot->hdr.size != 0);
1432
1433 memcpy(msg_slot, msg, msg->hdr.size);
1434
1435 xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1436
1437 if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1438 /*
1439 * If there is an existing idle kthread get it to deliver
1440 * the payload, otherwise we'll have to get the channel mgr
1441 * for this partition to create a kthread to do the delivery.
1442 */
1443 if (atomic_read(&ch->kthreads_idle) > 0)
1444 wake_up_nr(&ch->idle_wq, 1);
1445 else
1446 xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1447 }
1448 xpc_msgqueue_deref(ch);
1449 }
1450
1451 static irqreturn_t
1452 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1453 {
1454 struct xpc_notify_mq_msg_uv *msg;
1455 short partid;
1456 struct xpc_partition *part;
1457
1458 while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1459 NULL) {
1460
1461 partid = msg->hdr.partid;
1462 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1463 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1464 "invalid partid=0x%x in message\n", partid);
1465 } else {
1466 part = &xpc_partitions[partid];
1467
1468 if (xpc_part_ref(part)) {
1469 xpc_handle_notify_mq_msg_uv(part, msg);
1470 xpc_part_deref(part);
1471 }
1472 }
1473
1474 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1475 }
1476
1477 return IRQ_HANDLED;
1478 }
1479
1480 static int
1481 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1482 {
1483 return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1484 }
1485
1486 static void
1487 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1488 {
1489 struct xpc_channel *ch = &part->channels[ch_number];
1490 int ndeliverable_payloads;
1491
1492 xpc_msgqueue_ref(ch);
1493
1494 ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1495
1496 if (ndeliverable_payloads > 0 &&
1497 (ch->flags & XPC_C_CONNECTED) &&
1498 (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1499
1500 xpc_activate_kthreads(ch, ndeliverable_payloads);
1501 }
1502
1503 xpc_msgqueue_deref(ch);
1504 }
1505
1506 static enum xp_retval
1507 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1508 u16 payload_size, u8 notify_type, xpc_notify_func func,
1509 void *key)
1510 {
1511 enum xp_retval ret = xpSuccess;
1512 struct xpc_send_msg_slot_uv *msg_slot = NULL;
1513 struct xpc_notify_mq_msg_uv *msg;
1514 u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1515 size_t msg_size;
1516
1517 DBUG_ON(notify_type != XPC_N_CALL);
1518
1519 msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1520 if (msg_size > ch->entry_size)
1521 return xpPayloadTooBig;
1522
1523 xpc_msgqueue_ref(ch);
1524
1525 if (ch->flags & XPC_C_DISCONNECTING) {
1526 ret = ch->reason;
1527 goto out_1;
1528 }
1529 if (!(ch->flags & XPC_C_CONNECTED)) {
1530 ret = xpNotConnected;
1531 goto out_1;
1532 }
1533
1534 ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1535 if (ret != xpSuccess)
1536 goto out_1;
1537
1538 if (func != NULL) {
1539 atomic_inc(&ch->n_to_notify);
1540
1541 msg_slot->key = key;
1542 smp_wmb(); /* a non-NULL func must hit memory after the key */
1543 msg_slot->func = func;
1544
1545 if (ch->flags & XPC_C_DISCONNECTING) {
1546 ret = ch->reason;
1547 goto out_2;
1548 }
1549 }
1550
1551 msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1552 msg->hdr.partid = xp_partition_id;
1553 msg->hdr.ch_number = ch->number;
1554 msg->hdr.size = msg_size;
1555 msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1556 memcpy(&msg->payload, payload, payload_size);
1557
1558 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1559 msg_size);
1560 if (ret == xpSuccess)
1561 goto out_1;
1562
1563 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1564 out_2:
1565 if (func != NULL) {
1566 /*
1567 * Try to NULL the msg_slot's func field. If we fail, then
1568 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1569 * case we need to pretend we succeeded to send the message
1570 * since the user will get a callout for the disconnect error
1571 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1572 * error returned here will confuse them. Additionally, since
1573 * in this case the channel is being disconnected we don't need
1574 * to put the the msg_slot back on the free list.
1575 */
1576 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1577 ret = xpSuccess;
1578 goto out_1;
1579 }
1580
1581 msg_slot->key = NULL;
1582 atomic_dec(&ch->n_to_notify);
1583 }
1584 xpc_free_msg_slot_uv(ch, msg_slot);
1585 out_1:
1586 xpc_msgqueue_deref(ch);
1587 return ret;
1588 }
1589
1590 /*
1591 * Tell the callers of xpc_send_notify() that the status of their payloads
1592 * is unknown because the channel is now disconnecting.
1593 *
1594 * We don't worry about putting these msg_slots on the free list since the
1595 * msg_slots themselves are about to be kfree'd.
1596 */
1597 static void
1598 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1599 {
1600 struct xpc_send_msg_slot_uv *msg_slot;
1601 int entry;
1602
1603 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1604
1605 for (entry = 0; entry < ch->local_nentries; entry++) {
1606
1607 if (atomic_read(&ch->n_to_notify) == 0)
1608 break;
1609
1610 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1611 if (msg_slot->func != NULL)
1612 xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1613 }
1614 }
1615
1616 /*
1617 * Get the next deliverable message's payload.
1618 */
1619 static void *
1620 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1621 {
1622 struct xpc_fifo_entry_uv *entry;
1623 struct xpc_notify_mq_msg_uv *msg;
1624 void *payload = NULL;
1625
1626 if (!(ch->flags & XPC_C_DISCONNECTING)) {
1627 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1628 if (entry != NULL) {
1629 msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1630 hdr.u.next);
1631 payload = &msg->payload;
1632 }
1633 }
1634 return payload;
1635 }
1636
1637 static void
1638 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1639 {
1640 struct xpc_notify_mq_msg_uv *msg;
1641 enum xp_retval ret;
1642
1643 msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1644
1645 /* return an ACK to the sender of this message */
1646
1647 msg->hdr.partid = xp_partition_id;
1648 msg->hdr.size = 0; /* size of zero indicates this is an ACK */
1649
1650 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1651 sizeof(struct xpc_notify_mq_msghdr_uv));
1652 if (ret != xpSuccess)
1653 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1654
1655 msg->hdr.msg_slot_number += ch->remote_nentries;
1656 }
1657
1658 static struct xpc_arch_operations xpc_arch_ops_uv = {
1659 .setup_partitions = xpc_setup_partitions_uv,
1660 .teardown_partitions = xpc_teardown_partitions_uv,
1661 .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1662 .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1663 .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1664
1665 .allow_hb = xpc_allow_hb_uv,
1666 .disallow_hb = xpc_disallow_hb_uv,
1667 .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1668 .increment_heartbeat = xpc_increment_heartbeat_uv,
1669 .offline_heartbeat = xpc_offline_heartbeat_uv,
1670 .online_heartbeat = xpc_online_heartbeat_uv,
1671 .heartbeat_init = xpc_heartbeat_init_uv,
1672 .heartbeat_exit = xpc_heartbeat_exit_uv,
1673 .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1674
1675 .request_partition_activation =
1676 xpc_request_partition_activation_uv,
1677 .request_partition_reactivation =
1678 xpc_request_partition_reactivation_uv,
1679 .request_partition_deactivation =
1680 xpc_request_partition_deactivation_uv,
1681 .cancel_partition_deactivation_request =
1682 xpc_cancel_partition_deactivation_request_uv,
1683
1684 .setup_ch_structures = xpc_setup_ch_structures_uv,
1685 .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1686
1687 .make_first_contact = xpc_make_first_contact_uv,
1688
1689 .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1690 .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1691 .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1692 .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1693 .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1694 .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1695 .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1696
1697 .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1698
1699 .setup_msg_structures = xpc_setup_msg_structures_uv,
1700 .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1701
1702 .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1703 .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1704 .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1705 .partition_engaged = xpc_partition_engaged_uv,
1706 .any_partition_engaged = xpc_any_partition_engaged_uv,
1707
1708 .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1709 .send_payload = xpc_send_payload_uv,
1710 .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1711 .received_payload = xpc_received_payload_uv,
1712 .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1713 };
1714
1715 int
1716 xpc_init_uv(void)
1717 {
1718 xpc_arch_ops = xpc_arch_ops_uv;
1719
1720 if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1721 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1722 XPC_MSG_HDR_MAX_SIZE);
1723 return -E2BIG;
1724 }
1725
1726 xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0,
1727 XPC_ACTIVATE_IRQ_NAME,
1728 xpc_handle_activate_IRQ_uv);
1729 if (IS_ERR(xpc_activate_mq_uv))
1730 return PTR_ERR(xpc_activate_mq_uv);
1731
1732 xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0,
1733 XPC_NOTIFY_IRQ_NAME,
1734 xpc_handle_notify_IRQ_uv);
1735 if (IS_ERR(xpc_notify_mq_uv)) {
1736 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1737 return PTR_ERR(xpc_notify_mq_uv);
1738 }
1739
1740 return 0;
1741 }
1742
1743 void
1744 xpc_exit_uv(void)
1745 {
1746 xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1747 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1748 }
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