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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / misc / sgi-xp / xpc_uv.c
blob8725d5e8ab0c29bff2f6ab27fbacbc33891b48aa
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 nasid;
211 int pg_order;
212 struct page *page;
213 struct xpc_gru_mq_uv *mq;
214 struct uv_IO_APIC_route_entry *mmr_value;
215
216 mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
217 if (mq == NULL) {
218 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
219 "a xpc_gru_mq_uv structure\n");
220 ret = -ENOMEM;
221 goto out_0;
222 }
223
224 mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
225 GFP_KERNEL);
226 if (mq->gru_mq_desc == NULL) {
227 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
228 "a gru_message_queue_desc structure\n");
229 ret = -ENOMEM;
230 goto out_1;
231 }
232
233 pg_order = get_order(mq_size);
234 mq->order = pg_order + PAGE_SHIFT;
235 mq_size = 1UL << mq->order;
236
237 mq->mmr_blade = uv_cpu_to_blade_id(cpu);
238
239 nid = cpu_to_node(cpu);
240 page = alloc_pages_exact_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
241 pg_order);
242 if (page == NULL) {
243 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
244 "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
245 ret = -ENOMEM;
246 goto out_2;
247 }
248 mq->address = page_address(page);
249
250 /* enable generation of irq when GRU mq operation occurs to this mq */
251 ret = xpc_gru_mq_watchlist_alloc_uv(mq);
252 if (ret != 0)
253 goto out_3;
254
255 ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
256 if (ret != 0)
257 goto out_4;
258
259 ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
260 if (ret != 0) {
261 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
262 mq->irq, -ret);
263 goto out_5;
264 }
265
266 nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
267
268 mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
269 ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
270 nasid, mmr_value->vector, mmr_value->dest);
271 if (ret != 0) {
272 dev_err(xpc_part, "gru_create_message_queue() returned "
273 "error=%d\n", ret);
274 ret = -EINVAL;
275 goto out_6;
276 }
277
278 /* allow other partitions to access this GRU mq */
279 xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
280 if (xp_ret != xpSuccess) {
281 ret = -EACCES;
282 goto out_6;
283 }
284
285 return mq;
286
287 /* something went wrong */
288 out_6:
289 free_irq(mq->irq, NULL);
290 out_5:
291 xpc_release_gru_mq_irq_uv(mq);
292 out_4:
293 xpc_gru_mq_watchlist_free_uv(mq);
294 out_3:
295 free_pages((unsigned long)mq->address, pg_order);
296 out_2:
297 kfree(mq->gru_mq_desc);
298 out_1:
299 kfree(mq);
300 out_0:
301 return ERR_PTR(ret);
302 }
303
304 static void
305 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
306 {
307 unsigned int mq_size;
308 int pg_order;
309 int ret;
310
311 /* disallow other partitions to access GRU mq */
312 mq_size = 1UL << mq->order;
313 ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
314 BUG_ON(ret != xpSuccess);
315
316 /* unregister irq handler and release mq irq/vector mapping */
317 free_irq(mq->irq, NULL);
318 xpc_release_gru_mq_irq_uv(mq);
319
320 /* disable generation of irq when GRU mq op occurs to this mq */
321 xpc_gru_mq_watchlist_free_uv(mq);
322
323 pg_order = mq->order - PAGE_SHIFT;
324 free_pages((unsigned long)mq->address, pg_order);
325
326 kfree(mq);
327 }
328
329 static enum xp_retval
330 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
331 size_t msg_size)
332 {
333 enum xp_retval xp_ret;
334 int ret;
335
336 while (1) {
337 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
338 if (ret == MQE_OK) {
339 xp_ret = xpSuccess;
340 break;
341 }
342
343 if (ret == MQE_QUEUE_FULL) {
344 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
345 "error=MQE_QUEUE_FULL\n");
346 /* !!! handle QLimit reached; delay & try again */
347 /* ??? Do we add a limit to the number of retries? */
348 (void)msleep_interruptible(10);
349 } else if (ret == MQE_CONGESTION) {
350 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
351 "error=MQE_CONGESTION\n");
352 /* !!! handle LB Overflow; simply try again */
353 /* ??? Do we add a limit to the number of retries? */
354 } else {
355 /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
356 dev_err(xpc_chan, "gru_send_message_gpa() returned "
357 "error=%d\n", ret);
358 xp_ret = xpGruSendMqError;
359 break;
360 }
361 }
362 return xp_ret;
363 }
364
365 static void
366 xpc_process_activate_IRQ_rcvd_uv(void)
367 {
368 unsigned long irq_flags;
369 short partid;
370 struct xpc_partition *part;
371 u8 act_state_req;
372
373 DBUG_ON(xpc_activate_IRQ_rcvd == 0);
374
375 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
376 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
377 part = &xpc_partitions[partid];
378
379 if (part->sn.uv.act_state_req == 0)
380 continue;
381
382 xpc_activate_IRQ_rcvd--;
383 BUG_ON(xpc_activate_IRQ_rcvd < 0);
384
385 act_state_req = part->sn.uv.act_state_req;
386 part->sn.uv.act_state_req = 0;
387 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
388
389 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
390 if (part->act_state == XPC_P_AS_INACTIVE)
391 xpc_activate_partition(part);
392 else if (part->act_state == XPC_P_AS_DEACTIVATING)
393 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
394
395 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
396 if (part->act_state == XPC_P_AS_INACTIVE)
397 xpc_activate_partition(part);
398 else
399 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
400
401 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
402 XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
403
404 } else {
405 BUG();
406 }
407
408 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
409 if (xpc_activate_IRQ_rcvd == 0)
410 break;
411 }
412 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
413
414 }
415
416 static void
417 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
418 struct xpc_activate_mq_msghdr_uv *msg_hdr,
419 int *wakeup_hb_checker)
420 {
421 unsigned long irq_flags;
422 struct xpc_partition_uv *part_uv = &part->sn.uv;
423 struct xpc_openclose_args *args;
424
425 part_uv->remote_act_state = msg_hdr->act_state;
426
427 switch (msg_hdr->type) {
428 case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
429 /* syncing of remote_act_state was just done above */
430 break;
431
432 case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
433 struct xpc_activate_mq_msg_activate_req_uv *msg;
434
435 /*
436 * ??? Do we deal here with ts_jiffies being different
437 * ??? if act_state != XPC_P_AS_INACTIVE instead of
438 * ??? below?
439 */
440 msg = container_of(msg_hdr, struct
441 xpc_activate_mq_msg_activate_req_uv, hdr);
442
443 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
444 if (part_uv->act_state_req == 0)
445 xpc_activate_IRQ_rcvd++;
446 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
447 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
448 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
449 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
450
451 if (msg->activate_gru_mq_desc_gpa !=
452 part_uv->activate_gru_mq_desc_gpa) {
453 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
454 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
455 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
456 part_uv->activate_gru_mq_desc_gpa =
457 msg->activate_gru_mq_desc_gpa;
458 }
459 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
460
461 (*wakeup_hb_checker)++;
462 break;
463 }
464 case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
465 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
466
467 msg = container_of(msg_hdr, struct
468 xpc_activate_mq_msg_deactivate_req_uv, hdr);
469
470 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
471 if (part_uv->act_state_req == 0)
472 xpc_activate_IRQ_rcvd++;
473 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
474 part_uv->reason = msg->reason;
475 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
476
477 (*wakeup_hb_checker)++;
478 return;
479 }
480 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
481 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
482
483 msg = container_of(msg_hdr, struct
484 xpc_activate_mq_msg_chctl_closerequest_uv,
485 hdr);
486 args = &part->remote_openclose_args[msg->ch_number];
487 args->reason = msg->reason;
488
489 spin_lock_irqsave(&part->chctl_lock, irq_flags);
490 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
491 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
492
493 xpc_wakeup_channel_mgr(part);
494 break;
495 }
496 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
497 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
498
499 msg = container_of(msg_hdr, struct
500 xpc_activate_mq_msg_chctl_closereply_uv,
501 hdr);
502
503 spin_lock_irqsave(&part->chctl_lock, irq_flags);
504 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
505 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
506
507 xpc_wakeup_channel_mgr(part);
508 break;
509 }
510 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
511 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
512
513 msg = container_of(msg_hdr, struct
514 xpc_activate_mq_msg_chctl_openrequest_uv,
515 hdr);
516 args = &part->remote_openclose_args[msg->ch_number];
517 args->entry_size = msg->entry_size;
518 args->local_nentries = msg->local_nentries;
519
520 spin_lock_irqsave(&part->chctl_lock, irq_flags);
521 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
522 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
523
524 xpc_wakeup_channel_mgr(part);
525 break;
526 }
527 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
528 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
529
530 msg = container_of(msg_hdr, struct
531 xpc_activate_mq_msg_chctl_openreply_uv, hdr);
532 args = &part->remote_openclose_args[msg->ch_number];
533 args->remote_nentries = msg->remote_nentries;
534 args->local_nentries = msg->local_nentries;
535 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
536
537 spin_lock_irqsave(&part->chctl_lock, irq_flags);
538 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
539 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
540
541 xpc_wakeup_channel_mgr(part);
542 break;
543 }
544 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
545 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
546
547 msg = container_of(msg_hdr, struct
548 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
549 spin_lock_irqsave(&part->chctl_lock, irq_flags);
550 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
551 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
552
553 xpc_wakeup_channel_mgr(part);
554 }
555 case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
556 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
557 part_uv->flags |= XPC_P_ENGAGED_UV;
558 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
559 break;
560
561 case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
562 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
563 part_uv->flags &= ~XPC_P_ENGAGED_UV;
564 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
565 break;
566
567 default:
568 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
569 "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
570
571 /* get hb checker to deactivate from the remote partition */
572 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
573 if (part_uv->act_state_req == 0)
574 xpc_activate_IRQ_rcvd++;
575 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
576 part_uv->reason = xpBadMsgType;
577 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
578
579 (*wakeup_hb_checker)++;
580 return;
581 }
582
583 if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
584 part->remote_rp_ts_jiffies != 0) {
585 /*
586 * ??? Does what we do here need to be sensitive to
587 * ??? act_state or remote_act_state?
588 */
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_REACTIVATE_UV;
593 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
594
595 (*wakeup_hb_checker)++;
596 }
597 }
598
599 static irqreturn_t
600 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
601 {
602 struct xpc_activate_mq_msghdr_uv *msg_hdr;
603 short partid;
604 struct xpc_partition *part;
605 int wakeup_hb_checker = 0;
606 int part_referenced;
607
608 while (1) {
609 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
610 if (msg_hdr == NULL)
611 break;
612
613 partid = msg_hdr->partid;
614 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
615 dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
616 "received invalid partid=0x%x in message\n",
617 partid);
618 } else {
619 part = &xpc_partitions[partid];
620
621 part_referenced = xpc_part_ref(part);
622 xpc_handle_activate_mq_msg_uv(part, msg_hdr,
623 &wakeup_hb_checker);
624 if (part_referenced)
625 xpc_part_deref(part);
626 }
627
628 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
629 }
630
631 if (wakeup_hb_checker)
632 wake_up_interruptible(&xpc_activate_IRQ_wq);
633
634 return IRQ_HANDLED;
635 }
636
637 static enum xp_retval
638 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
639 unsigned long gru_mq_desc_gpa)
640 {
641 enum xp_retval ret;
642
643 ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
644 sizeof(struct gru_message_queue_desc));
645 if (ret == xpSuccess)
646 gru_mq_desc->mq = NULL;
647
648 return ret;
649 }
650
651 static enum xp_retval
652 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
653 int msg_type)
654 {
655 struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
656 struct xpc_partition_uv *part_uv = &part->sn.uv;
657 struct gru_message_queue_desc *gru_mq_desc;
658 unsigned long irq_flags;
659 enum xp_retval ret;
660
661 DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
662
663 msg_hdr->type = msg_type;
664 msg_hdr->partid = xp_partition_id;
665 msg_hdr->act_state = part->act_state;
666 msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
667
668 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
669 again:
670 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
671 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
672 if (gru_mq_desc == NULL) {
673 gru_mq_desc = kmalloc(sizeof(struct
674 gru_message_queue_desc),
675 GFP_KERNEL);
676 if (gru_mq_desc == NULL) {
677 ret = xpNoMemory;
678 goto done;
679 }
680 part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
681 }
682
683 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
684 part_uv->
685 activate_gru_mq_desc_gpa);
686 if (ret != xpSuccess)
687 goto done;
688
689 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
690 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
691 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
692 }
693
694 /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
695 ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
696 msg_size);
697 if (ret != xpSuccess) {
698 smp_rmb(); /* ensure a fresh copy of part_uv->flags */
699 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
700 goto again;
701 }
702 done:
703 mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
704 return ret;
705 }
706
707 static void
708 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
709 size_t msg_size, int msg_type)
710 {
711 enum xp_retval ret;
712
713 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
714 if (unlikely(ret != xpSuccess))
715 XPC_DEACTIVATE_PARTITION(part, ret);
716 }
717
718 static void
719 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
720 void *msg, size_t msg_size, int msg_type)
721 {
722 struct xpc_partition *part = &xpc_partitions[ch->partid];
723 enum xp_retval ret;
724
725 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
726 if (unlikely(ret != xpSuccess)) {
727 if (irq_flags != NULL)
728 spin_unlock_irqrestore(&ch->lock, *irq_flags);
729
730 XPC_DEACTIVATE_PARTITION(part, ret);
731
732 if (irq_flags != NULL)
733 spin_lock_irqsave(&ch->lock, *irq_flags);
734 }
735 }
736
737 static void
738 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
739 {
740 unsigned long irq_flags;
741 struct xpc_partition_uv *part_uv = &part->sn.uv;
742
743 /*
744 * !!! Make our side think that the remote partition sent an activate
745 * !!! mq message our way by doing what the activate IRQ handler would
746 * !!! do had one really been sent.
747 */
748
749 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
750 if (part_uv->act_state_req == 0)
751 xpc_activate_IRQ_rcvd++;
752 part_uv->act_state_req = act_state_req;
753 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
754
755 wake_up_interruptible(&xpc_activate_IRQ_wq);
756 }
757
758 static enum xp_retval
759 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
760 size_t *len)
761 {
762 s64 status;
763 enum xp_retval ret;
764
765 #if defined CONFIG_X86_64
766 status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
767 (u64 *)len);
768 if (status == BIOS_STATUS_SUCCESS)
769 ret = xpSuccess;
770 else if (status == BIOS_STATUS_MORE_PASSES)
771 ret = xpNeedMoreInfo;
772 else
773 ret = xpBiosError;
774
775 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
776 status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
777 if (status == SALRET_OK)
778 ret = xpSuccess;
779 else if (status == SALRET_MORE_PASSES)
780 ret = xpNeedMoreInfo;
781 else
782 ret = xpSalError;
783
784 #else
785 #error not a supported configuration
786 #endif
787
788 return ret;
789 }
790
791 static int
792 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
793 {
794 xpc_heartbeat_uv =
795 &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
796 rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
797 rp->sn.uv.activate_gru_mq_desc_gpa =
798 uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
799 return 0;
800 }
801
802 static void
803 xpc_allow_hb_uv(short partid)
804 {
805 }
806
807 static void
808 xpc_disallow_hb_uv(short partid)
809 {
810 }
811
812 static void
813 xpc_disallow_all_hbs_uv(void)
814 {
815 }
816
817 static void
818 xpc_increment_heartbeat_uv(void)
819 {
820 xpc_heartbeat_uv->value++;
821 }
822
823 static void
824 xpc_offline_heartbeat_uv(void)
825 {
826 xpc_increment_heartbeat_uv();
827 xpc_heartbeat_uv->offline = 1;
828 }
829
830 static void
831 xpc_online_heartbeat_uv(void)
832 {
833 xpc_increment_heartbeat_uv();
834 xpc_heartbeat_uv->offline = 0;
835 }
836
837 static void
838 xpc_heartbeat_init_uv(void)
839 {
840 xpc_heartbeat_uv->value = 1;
841 xpc_heartbeat_uv->offline = 0;
842 }
843
844 static void
845 xpc_heartbeat_exit_uv(void)
846 {
847 xpc_offline_heartbeat_uv();
848 }
849
850 static enum xp_retval
851 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
852 {
853 struct xpc_partition_uv *part_uv = &part->sn.uv;
854 enum xp_retval ret;
855
856 ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
857 part_uv->heartbeat_gpa,
858 sizeof(struct xpc_heartbeat_uv));
859 if (ret != xpSuccess)
860 return ret;
861
862 if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
863 !part_uv->cached_heartbeat.offline) {
864
865 ret = xpNoHeartbeat;
866 } else {
867 part->last_heartbeat = part_uv->cached_heartbeat.value;
868 }
869 return ret;
870 }
871
872 static void
873 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
874 unsigned long remote_rp_gpa, int nasid)
875 {
876 short partid = remote_rp->SAL_partid;
877 struct xpc_partition *part = &xpc_partitions[partid];
878 struct xpc_activate_mq_msg_activate_req_uv msg;
879
880 part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
881 part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
882 part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
883 part->sn.uv.activate_gru_mq_desc_gpa =
884 remote_rp->sn.uv.activate_gru_mq_desc_gpa;
885
886 /*
887 * ??? Is it a good idea to make this conditional on what is
888 * ??? potentially stale state information?
889 */
890 if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
891 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
892 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
893 msg.activate_gru_mq_desc_gpa =
894 xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
895 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
896 XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
897 }
898
899 if (part->act_state == XPC_P_AS_INACTIVE)
900 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
901 }
902
903 static void
904 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
905 {
906 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
907 }
908
909 static void
910 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
911 {
912 struct xpc_activate_mq_msg_deactivate_req_uv msg;
913
914 /*
915 * ??? Is it a good idea to make this conditional on what is
916 * ??? potentially stale state information?
917 */
918 if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
919 part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
920
921 msg.reason = part->reason;
922 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
923 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
924 }
925 }
926
927 static void
928 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
929 {
930 /* nothing needs to be done */
931 return;
932 }
933
934 static void
935 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
936 {
937 head->first = NULL;
938 head->last = NULL;
939 spin_lock_init(&head->lock);
940 head->n_entries = 0;
941 }
942
943 static void *
944 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
945 {
946 unsigned long irq_flags;
947 struct xpc_fifo_entry_uv *first;
948
949 spin_lock_irqsave(&head->lock, irq_flags);
950 first = head->first;
951 if (head->first != NULL) {
952 head->first = first->next;
953 if (head->first == NULL)
954 head->last = NULL;
955
956 head->n_entries--;
957 BUG_ON(head->n_entries < 0);
958
959 first->next = NULL;
960 }
961 spin_unlock_irqrestore(&head->lock, irq_flags);
962 return first;
963 }
964
965 static void
966 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
967 struct xpc_fifo_entry_uv *last)
968 {
969 unsigned long irq_flags;
970
971 last->next = NULL;
972 spin_lock_irqsave(&head->lock, irq_flags);
973 if (head->last != NULL)
974 head->last->next = last;
975 else
976 head->first = last;
977 head->last = last;
978 head->n_entries++;
979 spin_unlock_irqrestore(&head->lock, irq_flags);
980 }
981
982 static int
983 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
984 {
985 return head->n_entries;
986 }
987
988 /*
989 * Setup the channel structures that are uv specific.
990 */
991 static enum xp_retval
992 xpc_setup_ch_structures_uv(struct xpc_partition *part)
993 {
994 struct xpc_channel_uv *ch_uv;
995 int ch_number;
996
997 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
998 ch_uv = &part->channels[ch_number].sn.uv;
999
1000 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1001 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1002 }
1003
1004 return xpSuccess;
1005 }
1006
1007 /*
1008 * Teardown the channel structures that are uv specific.
1009 */
1010 static void
1011 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1012 {
1013 /* nothing needs to be done */
1014 return;
1015 }
1016
1017 static enum xp_retval
1018 xpc_make_first_contact_uv(struct xpc_partition *part)
1019 {
1020 struct xpc_activate_mq_msg_uv msg;
1021
1022 /*
1023 * We send a sync msg to get the remote partition's remote_act_state
1024 * updated to our current act_state which at this point should
1025 * be XPC_P_AS_ACTIVATING.
1026 */
1027 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1028 XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1029
1030 while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1031 (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1032
1033 dev_dbg(xpc_part, "waiting to make first contact with "
1034 "partition %d\n", XPC_PARTID(part));
1035
1036 /* wait a 1/4 of a second or so */
1037 (void)msleep_interruptible(250);
1038
1039 if (part->act_state == XPC_P_AS_DEACTIVATING)
1040 return part->reason;
1041 }
1042
1043 return xpSuccess;
1044 }
1045
1046 static u64
1047 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1048 {
1049 unsigned long irq_flags;
1050 union xpc_channel_ctl_flags chctl;
1051
1052 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1053 chctl = part->chctl;
1054 if (chctl.all_flags != 0)
1055 part->chctl.all_flags = 0;
1056
1057 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1058 return chctl.all_flags;
1059 }
1060
1061 static enum xp_retval
1062 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1063 {
1064 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1065 struct xpc_send_msg_slot_uv *msg_slot;
1066 unsigned long irq_flags;
1067 int nentries;
1068 int entry;
1069 size_t nbytes;
1070
1071 for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1072 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1073 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1074 if (ch_uv->send_msg_slots == NULL)
1075 continue;
1076
1077 for (entry = 0; entry < nentries; entry++) {
1078 msg_slot = &ch_uv->send_msg_slots[entry];
1079
1080 msg_slot->msg_slot_number = entry;
1081 xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1082 &msg_slot->next);
1083 }
1084
1085 spin_lock_irqsave(&ch->lock, irq_flags);
1086 if (nentries < ch->local_nentries)
1087 ch->local_nentries = nentries;
1088 spin_unlock_irqrestore(&ch->lock, irq_flags);
1089 return xpSuccess;
1090 }
1091
1092 return xpNoMemory;
1093 }
1094
1095 static enum xp_retval
1096 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1097 {
1098 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1099 struct xpc_notify_mq_msg_uv *msg_slot;
1100 unsigned long irq_flags;
1101 int nentries;
1102 int entry;
1103 size_t nbytes;
1104
1105 for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1106 nbytes = nentries * ch->entry_size;
1107 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1108 if (ch_uv->recv_msg_slots == NULL)
1109 continue;
1110
1111 for (entry = 0; entry < nentries; entry++) {
1112 msg_slot = ch_uv->recv_msg_slots +
1113 entry * ch->entry_size;
1114
1115 msg_slot->hdr.msg_slot_number = entry;
1116 }
1117
1118 spin_lock_irqsave(&ch->lock, irq_flags);
1119 if (nentries < ch->remote_nentries)
1120 ch->remote_nentries = nentries;
1121 spin_unlock_irqrestore(&ch->lock, irq_flags);
1122 return xpSuccess;
1123 }
1124
1125 return xpNoMemory;
1126 }
1127
1128 /*
1129 * Allocate msg_slots associated with the channel.
1130 */
1131 static enum xp_retval
1132 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1133 {
1134 static enum xp_retval ret;
1135 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1136
1137 DBUG_ON(ch->flags & XPC_C_SETUP);
1138
1139 ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1140 gru_message_queue_desc),
1141 GFP_KERNEL);
1142 if (ch_uv->cached_notify_gru_mq_desc == NULL)
1143 return xpNoMemory;
1144
1145 ret = xpc_allocate_send_msg_slot_uv(ch);
1146 if (ret == xpSuccess) {
1147
1148 ret = xpc_allocate_recv_msg_slot_uv(ch);
1149 if (ret != xpSuccess) {
1150 kfree(ch_uv->send_msg_slots);
1151 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1152 }
1153 }
1154 return ret;
1155 }
1156
1157 /*
1158 * Free up msg_slots and clear other stuff that were setup for the specified
1159 * channel.
1160 */
1161 static void
1162 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1163 {
1164 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1165
1166 DBUG_ON(!spin_is_locked(&ch->lock));
1167
1168 kfree(ch_uv->cached_notify_gru_mq_desc);
1169 ch_uv->cached_notify_gru_mq_desc = NULL;
1170
1171 if (ch->flags & XPC_C_SETUP) {
1172 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1173 kfree(ch_uv->send_msg_slots);
1174 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1175 kfree(ch_uv->recv_msg_slots);
1176 }
1177 }
1178
1179 static void
1180 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1181 {
1182 struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1183
1184 msg.ch_number = ch->number;
1185 msg.reason = ch->reason;
1186 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1187 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1188 }
1189
1190 static void
1191 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1192 {
1193 struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1194
1195 msg.ch_number = ch->number;
1196 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1197 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1198 }
1199
1200 static void
1201 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1202 {
1203 struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1204
1205 msg.ch_number = ch->number;
1206 msg.entry_size = ch->entry_size;
1207 msg.local_nentries = ch->local_nentries;
1208 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1209 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1210 }
1211
1212 static void
1213 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1214 {
1215 struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1216
1217 msg.ch_number = ch->number;
1218 msg.local_nentries = ch->local_nentries;
1219 msg.remote_nentries = ch->remote_nentries;
1220 msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1221 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1222 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1223 }
1224
1225 static void
1226 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1227 {
1228 struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1229
1230 msg.ch_number = ch->number;
1231 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1232 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1233 }
1234
1235 static void
1236 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1237 {
1238 unsigned long irq_flags;
1239
1240 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1241 part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1242 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1243
1244 xpc_wakeup_channel_mgr(part);
1245 }
1246
1247 static enum xp_retval
1248 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1249 unsigned long gru_mq_desc_gpa)
1250 {
1251 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1252
1253 DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1254 return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1255 gru_mq_desc_gpa);
1256 }
1257
1258 static void
1259 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1260 {
1261 struct xpc_activate_mq_msg_uv msg;
1262
1263 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1264 XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1265 }
1266
1267 static void
1268 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1269 {
1270 struct xpc_activate_mq_msg_uv msg;
1271
1272 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1273 XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1274 }
1275
1276 static void
1277 xpc_assume_partition_disengaged_uv(short partid)
1278 {
1279 struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1280 unsigned long irq_flags;
1281
1282 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1283 part_uv->flags &= ~XPC_P_ENGAGED_UV;
1284 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1285 }
1286
1287 static int
1288 xpc_partition_engaged_uv(short partid)
1289 {
1290 return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1291 }
1292
1293 static int
1294 xpc_any_partition_engaged_uv(void)
1295 {
1296 struct xpc_partition_uv *part_uv;
1297 short partid;
1298
1299 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1300 part_uv = &xpc_partitions[partid].sn.uv;
1301 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1302 return 1;
1303 }
1304 return 0;
1305 }
1306
1307 static enum xp_retval
1308 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1309 struct xpc_send_msg_slot_uv **address_of_msg_slot)
1310 {
1311 enum xp_retval ret;
1312 struct xpc_send_msg_slot_uv *msg_slot;
1313 struct xpc_fifo_entry_uv *entry;
1314
1315 while (1) {
1316 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1317 if (entry != NULL)
1318 break;
1319
1320 if (flags & XPC_NOWAIT)
1321 return xpNoWait;
1322
1323 ret = xpc_allocate_msg_wait(ch);
1324 if (ret != xpInterrupted && ret != xpTimeout)
1325 return ret;
1326 }
1327
1328 msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1329 *address_of_msg_slot = msg_slot;
1330 return xpSuccess;
1331 }
1332
1333 static void
1334 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1335 struct xpc_send_msg_slot_uv *msg_slot)
1336 {
1337 xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1338
1339 /* wakeup anyone waiting for a free msg slot */
1340 if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1341 wake_up(&ch->msg_allocate_wq);
1342 }
1343
1344 static void
1345 xpc_notify_sender_uv(struct xpc_channel *ch,
1346 struct xpc_send_msg_slot_uv *msg_slot,
1347 enum xp_retval reason)
1348 {
1349 xpc_notify_func func = msg_slot->func;
1350
1351 if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1352
1353 atomic_dec(&ch->n_to_notify);
1354
1355 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1356 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1357 msg_slot->msg_slot_number, ch->partid, ch->number);
1358
1359 func(reason, ch->partid, ch->number, msg_slot->key);
1360
1361 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1362 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1363 msg_slot->msg_slot_number, ch->partid, ch->number);
1364 }
1365 }
1366
1367 static void
1368 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1369 struct xpc_notify_mq_msg_uv *msg)
1370 {
1371 struct xpc_send_msg_slot_uv *msg_slot;
1372 int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1373
1374 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1375
1376 BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1377 msg_slot->msg_slot_number += ch->local_nentries;
1378
1379 if (msg_slot->func != NULL)
1380 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1381
1382 xpc_free_msg_slot_uv(ch, msg_slot);
1383 }
1384
1385 static void
1386 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1387 struct xpc_notify_mq_msg_uv *msg)
1388 {
1389 struct xpc_partition_uv *part_uv = &part->sn.uv;
1390 struct xpc_channel *ch;
1391 struct xpc_channel_uv *ch_uv;
1392 struct xpc_notify_mq_msg_uv *msg_slot;
1393 unsigned long irq_flags;
1394 int ch_number = msg->hdr.ch_number;
1395
1396 if (unlikely(ch_number >= part->nchannels)) {
1397 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1398 "channel number=0x%x in message from partid=%d\n",
1399 ch_number, XPC_PARTID(part));
1400
1401 /* get hb checker to deactivate from the remote partition */
1402 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1403 if (part_uv->act_state_req == 0)
1404 xpc_activate_IRQ_rcvd++;
1405 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1406 part_uv->reason = xpBadChannelNumber;
1407 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1408
1409 wake_up_interruptible(&xpc_activate_IRQ_wq);
1410 return;
1411 }
1412
1413 ch = &part->channels[ch_number];
1414 xpc_msgqueue_ref(ch);
1415
1416 if (!(ch->flags & XPC_C_CONNECTED)) {
1417 xpc_msgqueue_deref(ch);
1418 return;
1419 }
1420
1421 /* see if we're really dealing with an ACK for a previously sent msg */
1422 if (msg->hdr.size == 0) {
1423 xpc_handle_notify_mq_ack_uv(ch, msg);
1424 xpc_msgqueue_deref(ch);
1425 return;
1426 }
1427
1428 /* we're dealing with a normal message sent via the notify_mq */
1429 ch_uv = &ch->sn.uv;
1430
1431 msg_slot = ch_uv->recv_msg_slots +
1432 (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1433
1434 BUG_ON(msg_slot->hdr.size != 0);
1435
1436 memcpy(msg_slot, msg, msg->hdr.size);
1437
1438 xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1439
1440 if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1441 /*
1442 * If there is an existing idle kthread get it to deliver
1443 * the payload, otherwise we'll have to get the channel mgr
1444 * for this partition to create a kthread to do the delivery.
1445 */
1446 if (atomic_read(&ch->kthreads_idle) > 0)
1447 wake_up_nr(&ch->idle_wq, 1);
1448 else
1449 xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1450 }
1451 xpc_msgqueue_deref(ch);
1452 }
1453
1454 static irqreturn_t
1455 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1456 {
1457 struct xpc_notify_mq_msg_uv *msg;
1458 short partid;
1459 struct xpc_partition *part;
1460
1461 while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1462 NULL) {
1463
1464 partid = msg->hdr.partid;
1465 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1466 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1467 "invalid partid=0x%x in message\n", partid);
1468 } else {
1469 part = &xpc_partitions[partid];
1470
1471 if (xpc_part_ref(part)) {
1472 xpc_handle_notify_mq_msg_uv(part, msg);
1473 xpc_part_deref(part);
1474 }
1475 }
1476
1477 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1478 }
1479
1480 return IRQ_HANDLED;
1481 }
1482
1483 static int
1484 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1485 {
1486 return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1487 }
1488
1489 static void
1490 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1491 {
1492 struct xpc_channel *ch = &part->channels[ch_number];
1493 int ndeliverable_payloads;
1494
1495 xpc_msgqueue_ref(ch);
1496
1497 ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1498
1499 if (ndeliverable_payloads > 0 &&
1500 (ch->flags & XPC_C_CONNECTED) &&
1501 (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1502
1503 xpc_activate_kthreads(ch, ndeliverable_payloads);
1504 }
1505
1506 xpc_msgqueue_deref(ch);
1507 }
1508
1509 static enum xp_retval
1510 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1511 u16 payload_size, u8 notify_type, xpc_notify_func func,
1512 void *key)
1513 {
1514 enum xp_retval ret = xpSuccess;
1515 struct xpc_send_msg_slot_uv *msg_slot = NULL;
1516 struct xpc_notify_mq_msg_uv *msg;
1517 u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1518 size_t msg_size;
1519
1520 DBUG_ON(notify_type != XPC_N_CALL);
1521
1522 msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1523 if (msg_size > ch->entry_size)
1524 return xpPayloadTooBig;
1525
1526 xpc_msgqueue_ref(ch);
1527
1528 if (ch->flags & XPC_C_DISCONNECTING) {
1529 ret = ch->reason;
1530 goto out_1;
1531 }
1532 if (!(ch->flags & XPC_C_CONNECTED)) {
1533 ret = xpNotConnected;
1534 goto out_1;
1535 }
1536
1537 ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1538 if (ret != xpSuccess)
1539 goto out_1;
1540
1541 if (func != NULL) {
1542 atomic_inc(&ch->n_to_notify);
1543
1544 msg_slot->key = key;
1545 smp_wmb(); /* a non-NULL func must hit memory after the key */
1546 msg_slot->func = func;
1547
1548 if (ch->flags & XPC_C_DISCONNECTING) {
1549 ret = ch->reason;
1550 goto out_2;
1551 }
1552 }
1553
1554 msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1555 msg->hdr.partid = xp_partition_id;
1556 msg->hdr.ch_number = ch->number;
1557 msg->hdr.size = msg_size;
1558 msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1559 memcpy(&msg->payload, payload, payload_size);
1560
1561 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1562 msg_size);
1563 if (ret == xpSuccess)
1564 goto out_1;
1565
1566 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1567 out_2:
1568 if (func != NULL) {
1569 /*
1570 * Try to NULL the msg_slot's func field. If we fail, then
1571 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1572 * case we need to pretend we succeeded to send the message
1573 * since the user will get a callout for the disconnect error
1574 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1575 * error returned here will confuse them. Additionally, since
1576 * in this case the channel is being disconnected we don't need
1577 * to put the the msg_slot back on the free list.
1578 */
1579 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1580 ret = xpSuccess;
1581 goto out_1;
1582 }
1583
1584 msg_slot->key = NULL;
1585 atomic_dec(&ch->n_to_notify);
1586 }
1587 xpc_free_msg_slot_uv(ch, msg_slot);
1588 out_1:
1589 xpc_msgqueue_deref(ch);
1590 return ret;
1591 }
1592
1593 /*
1594 * Tell the callers of xpc_send_notify() that the status of their payloads
1595 * is unknown because the channel is now disconnecting.
1596 *
1597 * We don't worry about putting these msg_slots on the free list since the
1598 * msg_slots themselves are about to be kfree'd.
1599 */
1600 static void
1601 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1602 {
1603 struct xpc_send_msg_slot_uv *msg_slot;
1604 int entry;
1605
1606 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1607
1608 for (entry = 0; entry < ch->local_nentries; entry++) {
1609
1610 if (atomic_read(&ch->n_to_notify) == 0)
1611 break;
1612
1613 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1614 if (msg_slot->func != NULL)
1615 xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1616 }
1617 }
1618
1619 /*
1620 * Get the next deliverable message's payload.
1621 */
1622 static void *
1623 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1624 {
1625 struct xpc_fifo_entry_uv *entry;
1626 struct xpc_notify_mq_msg_uv *msg;
1627 void *payload = NULL;
1628
1629 if (!(ch->flags & XPC_C_DISCONNECTING)) {
1630 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1631 if (entry != NULL) {
1632 msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1633 hdr.u.next);
1634 payload = &msg->payload;
1635 }
1636 }
1637 return payload;
1638 }
1639
1640 static void
1641 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1642 {
1643 struct xpc_notify_mq_msg_uv *msg;
1644 enum xp_retval ret;
1645
1646 msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1647
1648 /* return an ACK to the sender of this message */
1649
1650 msg->hdr.partid = xp_partition_id;
1651 msg->hdr.size = 0; /* size of zero indicates this is an ACK */
1652
1653 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1654 sizeof(struct xpc_notify_mq_msghdr_uv));
1655 if (ret != xpSuccess)
1656 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1657 }
1658
1659 static struct xpc_arch_operations xpc_arch_ops_uv = {
1660 .setup_partitions = xpc_setup_partitions_uv,
1661 .teardown_partitions = xpc_teardown_partitions_uv,
1662 .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1663 .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1664 .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1665
1666 .allow_hb = xpc_allow_hb_uv,
1667 .disallow_hb = xpc_disallow_hb_uv,
1668 .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1669 .increment_heartbeat = xpc_increment_heartbeat_uv,
1670 .offline_heartbeat = xpc_offline_heartbeat_uv,
1671 .online_heartbeat = xpc_online_heartbeat_uv,
1672 .heartbeat_init = xpc_heartbeat_init_uv,
1673 .heartbeat_exit = xpc_heartbeat_exit_uv,
1674 .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1675
1676 .request_partition_activation =
1677 xpc_request_partition_activation_uv,
1678 .request_partition_reactivation =
1679 xpc_request_partition_reactivation_uv,
1680 .request_partition_deactivation =
1681 xpc_request_partition_deactivation_uv,
1682 .cancel_partition_deactivation_request =
1683 xpc_cancel_partition_deactivation_request_uv,
1684
1685 .setup_ch_structures = xpc_setup_ch_structures_uv,
1686 .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1687
1688 .make_first_contact = xpc_make_first_contact_uv,
1689
1690 .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1691 .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1692 .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1693 .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1694 .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1695 .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1696 .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1697
1698 .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1699
1700 .setup_msg_structures = xpc_setup_msg_structures_uv,
1701 .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1702
1703 .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1704 .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1705 .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1706 .partition_engaged = xpc_partition_engaged_uv,
1707 .any_partition_engaged = xpc_any_partition_engaged_uv,
1708
1709 .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1710 .send_payload = xpc_send_payload_uv,
1711 .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1712 .received_payload = xpc_received_payload_uv,
1713 .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1714 };
1715
1716 int
1717 xpc_init_uv(void)
1718 {
1719 xpc_arch_ops = xpc_arch_ops_uv;
1720
1721 if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1722 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1723 XPC_MSG_HDR_MAX_SIZE);
1724 return -E2BIG;
1725 }
1726
1727 xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0,
1728 XPC_ACTIVATE_IRQ_NAME,
1729 xpc_handle_activate_IRQ_uv);
1730 if (IS_ERR(xpc_activate_mq_uv))
1731 return PTR_ERR(xpc_activate_mq_uv);
1732
1733 xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0,
1734 XPC_NOTIFY_IRQ_NAME,
1735 xpc_handle_notify_IRQ_uv);
1736 if (IS_ERR(xpc_notify_mq_uv)) {
1737 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1738 return PTR_ERR(xpc_notify_mq_uv);
1739 }
1740
1741 return 0;
1742 }
1743
1744 void
1745 xpc_exit_uv(void)
1746 {
1747 xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1748 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1749 }