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regulator: add a regulator driver for the AS3711 PMIC
[linux-2.6.git] / drivers / misc / sgi-xp / xpc_uv.c
blobb9e2000969f025894be4bcae2c6950d699ded3a9
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 2008-2009 Silicon Graphics, Inc. All Rights Reserved.
7 */
8
9 /*
10 * Cross Partition Communication (XPC) uv-based functions.
11 *
12 * Architecture specific implementation of common functions.
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/mm.h>
18 #include <linux/interrupt.h>
19 #include <linux/delay.h>
20 #include <linux/device.h>
21 #include <linux/cpu.h>
22 #include <linux/module.h>
23 #include <linux/err.h>
24 #include <linux/slab.h>
25 #include <asm/uv/uv_hub.h>
26 #if defined CONFIG_X86_64
27 #include <asm/uv/bios.h>
28 #include <asm/uv/uv_irq.h>
29 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
30 #include <asm/sn/intr.h>
31 #include <asm/sn/sn_sal.h>
32 #endif
33 #include "../sgi-gru/gru.h"
34 #include "../sgi-gru/grukservices.h"
35 #include "xpc.h"
36
37 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
38 struct uv_IO_APIC_route_entry {
39 __u64 vector : 8,
40 delivery_mode : 3,
41 dest_mode : 1,
42 delivery_status : 1,
43 polarity : 1,
44 __reserved_1 : 1,
45 trigger : 1,
46 mask : 1,
47 __reserved_2 : 15,
48 dest : 32;
49 };
50 #endif
51
52 static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
53
54 #define XPC_ACTIVATE_MSG_SIZE_UV (1 * GRU_CACHE_LINE_BYTES)
55 #define XPC_ACTIVATE_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
56 XPC_ACTIVATE_MSG_SIZE_UV)
57 #define XPC_ACTIVATE_IRQ_NAME "xpc_activate"
58
59 #define XPC_NOTIFY_MSG_SIZE_UV (2 * GRU_CACHE_LINE_BYTES)
60 #define XPC_NOTIFY_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
61 XPC_NOTIFY_MSG_SIZE_UV)
62 #define XPC_NOTIFY_IRQ_NAME "xpc_notify"
63
64 static int xpc_mq_node = -1;
65
66 static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
67 static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
68
69 static int
70 xpc_setup_partitions_uv(void)
71 {
72 short partid;
73 struct xpc_partition_uv *part_uv;
74
75 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
76 part_uv = &xpc_partitions[partid].sn.uv;
77
78 mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
79 spin_lock_init(&part_uv->flags_lock);
80 part_uv->remote_act_state = XPC_P_AS_INACTIVE;
81 }
82 return 0;
83 }
84
85 static void
86 xpc_teardown_partitions_uv(void)
87 {
88 short partid;
89 struct xpc_partition_uv *part_uv;
90 unsigned long irq_flags;
91
92 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
93 part_uv = &xpc_partitions[partid].sn.uv;
94
95 if (part_uv->cached_activate_gru_mq_desc != NULL) {
96 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
97 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
98 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
99 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
100 kfree(part_uv->cached_activate_gru_mq_desc);
101 part_uv->cached_activate_gru_mq_desc = NULL;
102 mutex_unlock(&part_uv->
103 cached_activate_gru_mq_desc_mutex);
104 }
105 }
106 }
107
108 static int
109 xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
110 {
111 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
112
113 #if defined CONFIG_X86_64
114 mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
115 UV_AFFINITY_CPU);
116 if (mq->irq < 0)
117 return mq->irq;
118
119 mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
120
121 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
122 if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
123 mq->irq = SGI_XPC_ACTIVATE;
124 else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
125 mq->irq = SGI_XPC_NOTIFY;
126 else
127 return -EINVAL;
128
129 mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
130 uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
131 #else
132 #error not a supported configuration
133 #endif
134
135 return 0;
136 }
137
138 static void
139 xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
140 {
141 #if defined CONFIG_X86_64
142 uv_teardown_irq(mq->irq);
143
144 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
145 int mmr_pnode;
146 unsigned long mmr_value;
147
148 mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
149 mmr_value = 1UL << 16;
150
151 uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
152 #else
153 #error not a supported configuration
154 #endif
155 }
156
157 static int
158 xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
159 {
160 int ret;
161
162 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
163 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
164
165 ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
166 mq->order, &mq->mmr_offset);
167 if (ret < 0) {
168 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
169 ret);
170 return -EBUSY;
171 }
172 #elif defined CONFIG_X86_64
173 ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
174 mq->order, &mq->mmr_offset);
175 if (ret < 0) {
176 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
177 "ret=%d\n", ret);
178 return ret;
179 }
180 #else
181 #error not a supported configuration
182 #endif
183
184 mq->watchlist_num = ret;
185 return 0;
186 }
187
188 static void
189 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
190 {
191 int ret;
192 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
193
194 #if defined CONFIG_X86_64
195 ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
196 BUG_ON(ret != BIOS_STATUS_SUCCESS);
197 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
198 ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
199 BUG_ON(ret != SALRET_OK);
200 #else
201 #error not a supported configuration
202 #endif
203 }
204
205 static struct xpc_gru_mq_uv *
206 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
207 irq_handler_t irq_handler)
208 {
209 enum xp_retval xp_ret;
210 int ret;
211 int nid;
212 int nasid;
213 int pg_order;
214 struct page *page;
215 struct xpc_gru_mq_uv *mq;
216 struct uv_IO_APIC_route_entry *mmr_value;
217
218 mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
219 if (mq == NULL) {
220 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
221 "a xpc_gru_mq_uv structure\n");
222 ret = -ENOMEM;
223 goto out_0;
224 }
225
226 mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
227 GFP_KERNEL);
228 if (mq->gru_mq_desc == NULL) {
229 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
230 "a gru_message_queue_desc structure\n");
231 ret = -ENOMEM;
232 goto out_1;
233 }
234
235 pg_order = get_order(mq_size);
236 mq->order = pg_order + PAGE_SHIFT;
237 mq_size = 1UL << mq->order;
238
239 mq->mmr_blade = uv_cpu_to_blade_id(cpu);
240
241 nid = cpu_to_node(cpu);
242 page = alloc_pages_exact_node(nid,
243 GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
244 pg_order);
245 if (page == NULL) {
246 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
247 "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
248 ret = -ENOMEM;
249 goto out_2;
250 }
251 mq->address = page_address(page);
252
253 /* enable generation of irq when GRU mq operation occurs to this mq */
254 ret = xpc_gru_mq_watchlist_alloc_uv(mq);
255 if (ret != 0)
256 goto out_3;
257
258 ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
259 if (ret != 0)
260 goto out_4;
261
262 ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
263 if (ret != 0) {
264 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
265 mq->irq, -ret);
266 goto out_5;
267 }
268
269 nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
270
271 mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
272 ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
273 nasid, mmr_value->vector, mmr_value->dest);
274 if (ret != 0) {
275 dev_err(xpc_part, "gru_create_message_queue() returned "
276 "error=%d\n", ret);
277 ret = -EINVAL;
278 goto out_6;
279 }
280
281 /* allow other partitions to access this GRU mq */
282 xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
283 if (xp_ret != xpSuccess) {
284 ret = -EACCES;
285 goto out_6;
286 }
287
288 return mq;
289
290 /* something went wrong */
291 out_6:
292 free_irq(mq->irq, NULL);
293 out_5:
294 xpc_release_gru_mq_irq_uv(mq);
295 out_4:
296 xpc_gru_mq_watchlist_free_uv(mq);
297 out_3:
298 free_pages((unsigned long)mq->address, pg_order);
299 out_2:
300 kfree(mq->gru_mq_desc);
301 out_1:
302 kfree(mq);
303 out_0:
304 return ERR_PTR(ret);
305 }
306
307 static void
308 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
309 {
310 unsigned int mq_size;
311 int pg_order;
312 int ret;
313
314 /* disallow other partitions to access GRU mq */
315 mq_size = 1UL << mq->order;
316 ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
317 BUG_ON(ret != xpSuccess);
318
319 /* unregister irq handler and release mq irq/vector mapping */
320 free_irq(mq->irq, NULL);
321 xpc_release_gru_mq_irq_uv(mq);
322
323 /* disable generation of irq when GRU mq op occurs to this mq */
324 xpc_gru_mq_watchlist_free_uv(mq);
325
326 pg_order = mq->order - PAGE_SHIFT;
327 free_pages((unsigned long)mq->address, pg_order);
328
329 kfree(mq);
330 }
331
332 static enum xp_retval
333 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
334 size_t msg_size)
335 {
336 enum xp_retval xp_ret;
337 int ret;
338
339 while (1) {
340 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
341 if (ret == MQE_OK) {
342 xp_ret = xpSuccess;
343 break;
344 }
345
346 if (ret == MQE_QUEUE_FULL) {
347 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
348 "error=MQE_QUEUE_FULL\n");
349 /* !!! handle QLimit reached; delay & try again */
350 /* ??? Do we add a limit to the number of retries? */
351 (void)msleep_interruptible(10);
352 } else if (ret == MQE_CONGESTION) {
353 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
354 "error=MQE_CONGESTION\n");
355 /* !!! handle LB Overflow; simply try again */
356 /* ??? Do we add a limit to the number of retries? */
357 } else {
358 /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
359 dev_err(xpc_chan, "gru_send_message_gpa() returned "
360 "error=%d\n", ret);
361 xp_ret = xpGruSendMqError;
362 break;
363 }
364 }
365 return xp_ret;
366 }
367
368 static void
369 xpc_process_activate_IRQ_rcvd_uv(void)
370 {
371 unsigned long irq_flags;
372 short partid;
373 struct xpc_partition *part;
374 u8 act_state_req;
375
376 DBUG_ON(xpc_activate_IRQ_rcvd == 0);
377
378 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
379 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
380 part = &xpc_partitions[partid];
381
382 if (part->sn.uv.act_state_req == 0)
383 continue;
384
385 xpc_activate_IRQ_rcvd--;
386 BUG_ON(xpc_activate_IRQ_rcvd < 0);
387
388 act_state_req = part->sn.uv.act_state_req;
389 part->sn.uv.act_state_req = 0;
390 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
391
392 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
393 if (part->act_state == XPC_P_AS_INACTIVE)
394 xpc_activate_partition(part);
395 else if (part->act_state == XPC_P_AS_DEACTIVATING)
396 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
397
398 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
399 if (part->act_state == XPC_P_AS_INACTIVE)
400 xpc_activate_partition(part);
401 else
402 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
403
404 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
405 XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
406
407 } else {
408 BUG();
409 }
410
411 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
412 if (xpc_activate_IRQ_rcvd == 0)
413 break;
414 }
415 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
416
417 }
418
419 static void
420 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
421 struct xpc_activate_mq_msghdr_uv *msg_hdr,
422 int part_setup,
423 int *wakeup_hb_checker)
424 {
425 unsigned long irq_flags;
426 struct xpc_partition_uv *part_uv = &part->sn.uv;
427 struct xpc_openclose_args *args;
428
429 part_uv->remote_act_state = msg_hdr->act_state;
430
431 switch (msg_hdr->type) {
432 case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
433 /* syncing of remote_act_state was just done above */
434 break;
435
436 case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
437 struct xpc_activate_mq_msg_activate_req_uv *msg;
438
439 /*
440 * ??? Do we deal here with ts_jiffies being different
441 * ??? if act_state != XPC_P_AS_INACTIVE instead of
442 * ??? below?
443 */
444 msg = container_of(msg_hdr, struct
445 xpc_activate_mq_msg_activate_req_uv, hdr);
446
447 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
448 if (part_uv->act_state_req == 0)
449 xpc_activate_IRQ_rcvd++;
450 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
451 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
452 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
453 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
454
455 if (msg->activate_gru_mq_desc_gpa !=
456 part_uv->activate_gru_mq_desc_gpa) {
457 spin_lock(&part_uv->flags_lock);
458 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
459 spin_unlock(&part_uv->flags_lock);
460 part_uv->activate_gru_mq_desc_gpa =
461 msg->activate_gru_mq_desc_gpa;
462 }
463 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
464
465 (*wakeup_hb_checker)++;
466 break;
467 }
468 case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
469 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
470
471 msg = container_of(msg_hdr, struct
472 xpc_activate_mq_msg_deactivate_req_uv, hdr);
473
474 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
475 if (part_uv->act_state_req == 0)
476 xpc_activate_IRQ_rcvd++;
477 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
478 part_uv->reason = msg->reason;
479 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
480
481 (*wakeup_hb_checker)++;
482 return;
483 }
484 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
485 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
486
487 if (!part_setup)
488 break;
489
490 msg = container_of(msg_hdr, struct
491 xpc_activate_mq_msg_chctl_closerequest_uv,
492 hdr);
493 args = &part->remote_openclose_args[msg->ch_number];
494 args->reason = msg->reason;
495
496 spin_lock_irqsave(&part->chctl_lock, irq_flags);
497 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
498 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
499
500 xpc_wakeup_channel_mgr(part);
501 break;
502 }
503 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
504 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
505
506 if (!part_setup)
507 break;
508
509 msg = container_of(msg_hdr, struct
510 xpc_activate_mq_msg_chctl_closereply_uv,
511 hdr);
512
513 spin_lock_irqsave(&part->chctl_lock, irq_flags);
514 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
515 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
516
517 xpc_wakeup_channel_mgr(part);
518 break;
519 }
520 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
521 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
522
523 if (!part_setup)
524 break;
525
526 msg = container_of(msg_hdr, struct
527 xpc_activate_mq_msg_chctl_openrequest_uv,
528 hdr);
529 args = &part->remote_openclose_args[msg->ch_number];
530 args->entry_size = msg->entry_size;
531 args->local_nentries = msg->local_nentries;
532
533 spin_lock_irqsave(&part->chctl_lock, irq_flags);
534 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
535 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
536
537 xpc_wakeup_channel_mgr(part);
538 break;
539 }
540 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
541 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
542
543 if (!part_setup)
544 break;
545
546 msg = container_of(msg_hdr, struct
547 xpc_activate_mq_msg_chctl_openreply_uv, hdr);
548 args = &part->remote_openclose_args[msg->ch_number];
549 args->remote_nentries = msg->remote_nentries;
550 args->local_nentries = msg->local_nentries;
551 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
552
553 spin_lock_irqsave(&part->chctl_lock, irq_flags);
554 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
555 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
556
557 xpc_wakeup_channel_mgr(part);
558 break;
559 }
560 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
561 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
562
563 if (!part_setup)
564 break;
565
566 msg = container_of(msg_hdr, struct
567 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
568 spin_lock_irqsave(&part->chctl_lock, irq_flags);
569 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
570 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
571
572 xpc_wakeup_channel_mgr(part);
573 }
574 case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
575 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
576 part_uv->flags |= XPC_P_ENGAGED_UV;
577 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
578 break;
579
580 case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
581 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
582 part_uv->flags &= ~XPC_P_ENGAGED_UV;
583 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
584 break;
585
586 default:
587 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
588 "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
589
590 /* get hb checker to deactivate from the remote partition */
591 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
592 if (part_uv->act_state_req == 0)
593 xpc_activate_IRQ_rcvd++;
594 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
595 part_uv->reason = xpBadMsgType;
596 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
597
598 (*wakeup_hb_checker)++;
599 return;
600 }
601
602 if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
603 part->remote_rp_ts_jiffies != 0) {
604 /*
605 * ??? Does what we do here need to be sensitive to
606 * ??? act_state or remote_act_state?
607 */
608 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
609 if (part_uv->act_state_req == 0)
610 xpc_activate_IRQ_rcvd++;
611 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
612 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
613
614 (*wakeup_hb_checker)++;
615 }
616 }
617
618 static irqreturn_t
619 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
620 {
621 struct xpc_activate_mq_msghdr_uv *msg_hdr;
622 short partid;
623 struct xpc_partition *part;
624 int wakeup_hb_checker = 0;
625 int part_referenced;
626
627 while (1) {
628 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
629 if (msg_hdr == NULL)
630 break;
631
632 partid = msg_hdr->partid;
633 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
634 dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
635 "received invalid partid=0x%x in message\n",
636 partid);
637 } else {
638 part = &xpc_partitions[partid];
639
640 part_referenced = xpc_part_ref(part);
641 xpc_handle_activate_mq_msg_uv(part, msg_hdr,
642 part_referenced,
643 &wakeup_hb_checker);
644 if (part_referenced)
645 xpc_part_deref(part);
646 }
647
648 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
649 }
650
651 if (wakeup_hb_checker)
652 wake_up_interruptible(&xpc_activate_IRQ_wq);
653
654 return IRQ_HANDLED;
655 }
656
657 static enum xp_retval
658 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
659 unsigned long gru_mq_desc_gpa)
660 {
661 enum xp_retval ret;
662
663 ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
664 sizeof(struct gru_message_queue_desc));
665 if (ret == xpSuccess)
666 gru_mq_desc->mq = NULL;
667
668 return ret;
669 }
670
671 static enum xp_retval
672 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
673 int msg_type)
674 {
675 struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
676 struct xpc_partition_uv *part_uv = &part->sn.uv;
677 struct gru_message_queue_desc *gru_mq_desc;
678 unsigned long irq_flags;
679 enum xp_retval ret;
680
681 DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
682
683 msg_hdr->type = msg_type;
684 msg_hdr->partid = xp_partition_id;
685 msg_hdr->act_state = part->act_state;
686 msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
687
688 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
689 again:
690 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
691 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
692 if (gru_mq_desc == NULL) {
693 gru_mq_desc = kmalloc(sizeof(struct
694 gru_message_queue_desc),
695 GFP_KERNEL);
696 if (gru_mq_desc == NULL) {
697 ret = xpNoMemory;
698 goto done;
699 }
700 part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
701 }
702
703 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
704 part_uv->
705 activate_gru_mq_desc_gpa);
706 if (ret != xpSuccess)
707 goto done;
708
709 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
710 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
711 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
712 }
713
714 /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
715 ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
716 msg_size);
717 if (ret != xpSuccess) {
718 smp_rmb(); /* ensure a fresh copy of part_uv->flags */
719 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
720 goto again;
721 }
722 done:
723 mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
724 return ret;
725 }
726
727 static void
728 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
729 size_t msg_size, int msg_type)
730 {
731 enum xp_retval ret;
732
733 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
734 if (unlikely(ret != xpSuccess))
735 XPC_DEACTIVATE_PARTITION(part, ret);
736 }
737
738 static void
739 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
740 void *msg, size_t msg_size, int msg_type)
741 {
742 struct xpc_partition *part = &xpc_partitions[ch->partid];
743 enum xp_retval ret;
744
745 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
746 if (unlikely(ret != xpSuccess)) {
747 if (irq_flags != NULL)
748 spin_unlock_irqrestore(&ch->lock, *irq_flags);
749
750 XPC_DEACTIVATE_PARTITION(part, ret);
751
752 if (irq_flags != NULL)
753 spin_lock_irqsave(&ch->lock, *irq_flags);
754 }
755 }
756
757 static void
758 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
759 {
760 unsigned long irq_flags;
761 struct xpc_partition_uv *part_uv = &part->sn.uv;
762
763 /*
764 * !!! Make our side think that the remote partition sent an activate
765 * !!! mq message our way by doing what the activate IRQ handler would
766 * !!! do had one really been sent.
767 */
768
769 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
770 if (part_uv->act_state_req == 0)
771 xpc_activate_IRQ_rcvd++;
772 part_uv->act_state_req = act_state_req;
773 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
774
775 wake_up_interruptible(&xpc_activate_IRQ_wq);
776 }
777
778 static enum xp_retval
779 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
780 size_t *len)
781 {
782 s64 status;
783 enum xp_retval ret;
784
785 #if defined CONFIG_X86_64
786 status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
787 (u64 *)len);
788 if (status == BIOS_STATUS_SUCCESS)
789 ret = xpSuccess;
790 else if (status == BIOS_STATUS_MORE_PASSES)
791 ret = xpNeedMoreInfo;
792 else
793 ret = xpBiosError;
794
795 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
796 status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
797 if (status == SALRET_OK)
798 ret = xpSuccess;
799 else if (status == SALRET_MORE_PASSES)
800 ret = xpNeedMoreInfo;
801 else
802 ret = xpSalError;
803
804 #else
805 #error not a supported configuration
806 #endif
807
808 return ret;
809 }
810
811 static int
812 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
813 {
814 xpc_heartbeat_uv =
815 &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
816 rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
817 rp->sn.uv.activate_gru_mq_desc_gpa =
818 uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
819 return 0;
820 }
821
822 static void
823 xpc_allow_hb_uv(short partid)
824 {
825 }
826
827 static void
828 xpc_disallow_hb_uv(short partid)
829 {
830 }
831
832 static void
833 xpc_disallow_all_hbs_uv(void)
834 {
835 }
836
837 static void
838 xpc_increment_heartbeat_uv(void)
839 {
840 xpc_heartbeat_uv->value++;
841 }
842
843 static void
844 xpc_offline_heartbeat_uv(void)
845 {
846 xpc_increment_heartbeat_uv();
847 xpc_heartbeat_uv->offline = 1;
848 }
849
850 static void
851 xpc_online_heartbeat_uv(void)
852 {
853 xpc_increment_heartbeat_uv();
854 xpc_heartbeat_uv->offline = 0;
855 }
856
857 static void
858 xpc_heartbeat_init_uv(void)
859 {
860 xpc_heartbeat_uv->value = 1;
861 xpc_heartbeat_uv->offline = 0;
862 }
863
864 static void
865 xpc_heartbeat_exit_uv(void)
866 {
867 xpc_offline_heartbeat_uv();
868 }
869
870 static enum xp_retval
871 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
872 {
873 struct xpc_partition_uv *part_uv = &part->sn.uv;
874 enum xp_retval ret;
875
876 ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
877 part_uv->heartbeat_gpa,
878 sizeof(struct xpc_heartbeat_uv));
879 if (ret != xpSuccess)
880 return ret;
881
882 if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
883 !part_uv->cached_heartbeat.offline) {
884
885 ret = xpNoHeartbeat;
886 } else {
887 part->last_heartbeat = part_uv->cached_heartbeat.value;
888 }
889 return ret;
890 }
891
892 static void
893 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
894 unsigned long remote_rp_gpa, int nasid)
895 {
896 short partid = remote_rp->SAL_partid;
897 struct xpc_partition *part = &xpc_partitions[partid];
898 struct xpc_activate_mq_msg_activate_req_uv msg;
899
900 part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
901 part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
902 part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
903 part->sn.uv.activate_gru_mq_desc_gpa =
904 remote_rp->sn.uv.activate_gru_mq_desc_gpa;
905
906 /*
907 * ??? Is it a good idea to make this conditional on what is
908 * ??? potentially stale state information?
909 */
910 if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
911 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
912 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
913 msg.activate_gru_mq_desc_gpa =
914 xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
915 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
916 XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
917 }
918
919 if (part->act_state == XPC_P_AS_INACTIVE)
920 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
921 }
922
923 static void
924 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
925 {
926 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
927 }
928
929 static void
930 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
931 {
932 struct xpc_activate_mq_msg_deactivate_req_uv msg;
933
934 /*
935 * ??? Is it a good idea to make this conditional on what is
936 * ??? potentially stale state information?
937 */
938 if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
939 part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
940
941 msg.reason = part->reason;
942 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
943 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
944 }
945 }
946
947 static void
948 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
949 {
950 /* nothing needs to be done */
951 return;
952 }
953
954 static void
955 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
956 {
957 head->first = NULL;
958 head->last = NULL;
959 spin_lock_init(&head->lock);
960 head->n_entries = 0;
961 }
962
963 static void *
964 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
965 {
966 unsigned long irq_flags;
967 struct xpc_fifo_entry_uv *first;
968
969 spin_lock_irqsave(&head->lock, irq_flags);
970 first = head->first;
971 if (head->first != NULL) {
972 head->first = first->next;
973 if (head->first == NULL)
974 head->last = NULL;
975
976 head->n_entries--;
977 BUG_ON(head->n_entries < 0);
978
979 first->next = NULL;
980 }
981 spin_unlock_irqrestore(&head->lock, irq_flags);
982 return first;
983 }
984
985 static void
986 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
987 struct xpc_fifo_entry_uv *last)
988 {
989 unsigned long irq_flags;
990
991 last->next = NULL;
992 spin_lock_irqsave(&head->lock, irq_flags);
993 if (head->last != NULL)
994 head->last->next = last;
995 else
996 head->first = last;
997 head->last = last;
998 head->n_entries++;
999 spin_unlock_irqrestore(&head->lock, irq_flags);
1000 }
1001
1002 static int
1003 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
1004 {
1005 return head->n_entries;
1006 }
1007
1008 /*
1009 * Setup the channel structures that are uv specific.
1010 */
1011 static enum xp_retval
1012 xpc_setup_ch_structures_uv(struct xpc_partition *part)
1013 {
1014 struct xpc_channel_uv *ch_uv;
1015 int ch_number;
1016
1017 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
1018 ch_uv = &part->channels[ch_number].sn.uv;
1019
1020 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1021 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1022 }
1023
1024 return xpSuccess;
1025 }
1026
1027 /*
1028 * Teardown the channel structures that are uv specific.
1029 */
1030 static void
1031 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1032 {
1033 /* nothing needs to be done */
1034 return;
1035 }
1036
1037 static enum xp_retval
1038 xpc_make_first_contact_uv(struct xpc_partition *part)
1039 {
1040 struct xpc_activate_mq_msg_uv msg;
1041
1042 /*
1043 * We send a sync msg to get the remote partition's remote_act_state
1044 * updated to our current act_state which at this point should
1045 * be XPC_P_AS_ACTIVATING.
1046 */
1047 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1048 XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1049
1050 while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1051 (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1052
1053 dev_dbg(xpc_part, "waiting to make first contact with "
1054 "partition %d\n", XPC_PARTID(part));
1055
1056 /* wait a 1/4 of a second or so */
1057 (void)msleep_interruptible(250);
1058
1059 if (part->act_state == XPC_P_AS_DEACTIVATING)
1060 return part->reason;
1061 }
1062
1063 return xpSuccess;
1064 }
1065
1066 static u64
1067 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1068 {
1069 unsigned long irq_flags;
1070 union xpc_channel_ctl_flags chctl;
1071
1072 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1073 chctl = part->chctl;
1074 if (chctl.all_flags != 0)
1075 part->chctl.all_flags = 0;
1076
1077 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1078 return chctl.all_flags;
1079 }
1080
1081 static enum xp_retval
1082 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1083 {
1084 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1085 struct xpc_send_msg_slot_uv *msg_slot;
1086 unsigned long irq_flags;
1087 int nentries;
1088 int entry;
1089 size_t nbytes;
1090
1091 for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1092 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1093 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1094 if (ch_uv->send_msg_slots == NULL)
1095 continue;
1096
1097 for (entry = 0; entry < nentries; entry++) {
1098 msg_slot = &ch_uv->send_msg_slots[entry];
1099
1100 msg_slot->msg_slot_number = entry;
1101 xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1102 &msg_slot->next);
1103 }
1104
1105 spin_lock_irqsave(&ch->lock, irq_flags);
1106 if (nentries < ch->local_nentries)
1107 ch->local_nentries = nentries;
1108 spin_unlock_irqrestore(&ch->lock, irq_flags);
1109 return xpSuccess;
1110 }
1111
1112 return xpNoMemory;
1113 }
1114
1115 static enum xp_retval
1116 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1117 {
1118 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1119 struct xpc_notify_mq_msg_uv *msg_slot;
1120 unsigned long irq_flags;
1121 int nentries;
1122 int entry;
1123 size_t nbytes;
1124
1125 for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1126 nbytes = nentries * ch->entry_size;
1127 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1128 if (ch_uv->recv_msg_slots == NULL)
1129 continue;
1130
1131 for (entry = 0; entry < nentries; entry++) {
1132 msg_slot = ch_uv->recv_msg_slots +
1133 entry * ch->entry_size;
1134
1135 msg_slot->hdr.msg_slot_number = entry;
1136 }
1137
1138 spin_lock_irqsave(&ch->lock, irq_flags);
1139 if (nentries < ch->remote_nentries)
1140 ch->remote_nentries = nentries;
1141 spin_unlock_irqrestore(&ch->lock, irq_flags);
1142 return xpSuccess;
1143 }
1144
1145 return xpNoMemory;
1146 }
1147
1148 /*
1149 * Allocate msg_slots associated with the channel.
1150 */
1151 static enum xp_retval
1152 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1153 {
1154 static enum xp_retval ret;
1155 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1156
1157 DBUG_ON(ch->flags & XPC_C_SETUP);
1158
1159 ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1160 gru_message_queue_desc),
1161 GFP_KERNEL);
1162 if (ch_uv->cached_notify_gru_mq_desc == NULL)
1163 return xpNoMemory;
1164
1165 ret = xpc_allocate_send_msg_slot_uv(ch);
1166 if (ret == xpSuccess) {
1167
1168 ret = xpc_allocate_recv_msg_slot_uv(ch);
1169 if (ret != xpSuccess) {
1170 kfree(ch_uv->send_msg_slots);
1171 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1172 }
1173 }
1174 return ret;
1175 }
1176
1177 /*
1178 * Free up msg_slots and clear other stuff that were setup for the specified
1179 * channel.
1180 */
1181 static void
1182 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1183 {
1184 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1185
1186 DBUG_ON(!spin_is_locked(&ch->lock));
1187
1188 kfree(ch_uv->cached_notify_gru_mq_desc);
1189 ch_uv->cached_notify_gru_mq_desc = NULL;
1190
1191 if (ch->flags & XPC_C_SETUP) {
1192 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1193 kfree(ch_uv->send_msg_slots);
1194 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1195 kfree(ch_uv->recv_msg_slots);
1196 }
1197 }
1198
1199 static void
1200 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1201 {
1202 struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1203
1204 msg.ch_number = ch->number;
1205 msg.reason = ch->reason;
1206 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1207 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1208 }
1209
1210 static void
1211 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1212 {
1213 struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1214
1215 msg.ch_number = ch->number;
1216 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1217 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1218 }
1219
1220 static void
1221 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1222 {
1223 struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1224
1225 msg.ch_number = ch->number;
1226 msg.entry_size = ch->entry_size;
1227 msg.local_nentries = ch->local_nentries;
1228 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1229 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1230 }
1231
1232 static void
1233 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1234 {
1235 struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1236
1237 msg.ch_number = ch->number;
1238 msg.local_nentries = ch->local_nentries;
1239 msg.remote_nentries = ch->remote_nentries;
1240 msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1241 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1242 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1243 }
1244
1245 static void
1246 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1247 {
1248 struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1249
1250 msg.ch_number = ch->number;
1251 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1252 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1253 }
1254
1255 static void
1256 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1257 {
1258 unsigned long irq_flags;
1259
1260 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1261 part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1262 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1263
1264 xpc_wakeup_channel_mgr(part);
1265 }
1266
1267 static enum xp_retval
1268 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1269 unsigned long gru_mq_desc_gpa)
1270 {
1271 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1272
1273 DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1274 return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1275 gru_mq_desc_gpa);
1276 }
1277
1278 static void
1279 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1280 {
1281 struct xpc_activate_mq_msg_uv msg;
1282
1283 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1284 XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1285 }
1286
1287 static void
1288 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1289 {
1290 struct xpc_activate_mq_msg_uv msg;
1291
1292 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1293 XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1294 }
1295
1296 static void
1297 xpc_assume_partition_disengaged_uv(short partid)
1298 {
1299 struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1300 unsigned long irq_flags;
1301
1302 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1303 part_uv->flags &= ~XPC_P_ENGAGED_UV;
1304 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1305 }
1306
1307 static int
1308 xpc_partition_engaged_uv(short partid)
1309 {
1310 return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1311 }
1312
1313 static int
1314 xpc_any_partition_engaged_uv(void)
1315 {
1316 struct xpc_partition_uv *part_uv;
1317 short partid;
1318
1319 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1320 part_uv = &xpc_partitions[partid].sn.uv;
1321 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1322 return 1;
1323 }
1324 return 0;
1325 }
1326
1327 static enum xp_retval
1328 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1329 struct xpc_send_msg_slot_uv **address_of_msg_slot)
1330 {
1331 enum xp_retval ret;
1332 struct xpc_send_msg_slot_uv *msg_slot;
1333 struct xpc_fifo_entry_uv *entry;
1334
1335 while (1) {
1336 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1337 if (entry != NULL)
1338 break;
1339
1340 if (flags & XPC_NOWAIT)
1341 return xpNoWait;
1342
1343 ret = xpc_allocate_msg_wait(ch);
1344 if (ret != xpInterrupted && ret != xpTimeout)
1345 return ret;
1346 }
1347
1348 msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1349 *address_of_msg_slot = msg_slot;
1350 return xpSuccess;
1351 }
1352
1353 static void
1354 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1355 struct xpc_send_msg_slot_uv *msg_slot)
1356 {
1357 xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1358
1359 /* wakeup anyone waiting for a free msg slot */
1360 if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1361 wake_up(&ch->msg_allocate_wq);
1362 }
1363
1364 static void
1365 xpc_notify_sender_uv(struct xpc_channel *ch,
1366 struct xpc_send_msg_slot_uv *msg_slot,
1367 enum xp_retval reason)
1368 {
1369 xpc_notify_func func = msg_slot->func;
1370
1371 if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1372
1373 atomic_dec(&ch->n_to_notify);
1374
1375 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1376 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1377 msg_slot->msg_slot_number, ch->partid, ch->number);
1378
1379 func(reason, ch->partid, ch->number, msg_slot->key);
1380
1381 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1382 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1383 msg_slot->msg_slot_number, ch->partid, ch->number);
1384 }
1385 }
1386
1387 static void
1388 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1389 struct xpc_notify_mq_msg_uv *msg)
1390 {
1391 struct xpc_send_msg_slot_uv *msg_slot;
1392 int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1393
1394 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1395
1396 BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1397 msg_slot->msg_slot_number += ch->local_nentries;
1398
1399 if (msg_slot->func != NULL)
1400 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1401
1402 xpc_free_msg_slot_uv(ch, msg_slot);
1403 }
1404
1405 static void
1406 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1407 struct xpc_notify_mq_msg_uv *msg)
1408 {
1409 struct xpc_partition_uv *part_uv = &part->sn.uv;
1410 struct xpc_channel *ch;
1411 struct xpc_channel_uv *ch_uv;
1412 struct xpc_notify_mq_msg_uv *msg_slot;
1413 unsigned long irq_flags;
1414 int ch_number = msg->hdr.ch_number;
1415
1416 if (unlikely(ch_number >= part->nchannels)) {
1417 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1418 "channel number=0x%x in message from partid=%d\n",
1419 ch_number, XPC_PARTID(part));
1420
1421 /* get hb checker to deactivate from the remote partition */
1422 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1423 if (part_uv->act_state_req == 0)
1424 xpc_activate_IRQ_rcvd++;
1425 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1426 part_uv->reason = xpBadChannelNumber;
1427 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1428
1429 wake_up_interruptible(&xpc_activate_IRQ_wq);
1430 return;
1431 }
1432
1433 ch = &part->channels[ch_number];
1434 xpc_msgqueue_ref(ch);
1435
1436 if (!(ch->flags & XPC_C_CONNECTED)) {
1437 xpc_msgqueue_deref(ch);
1438 return;
1439 }
1440
1441 /* see if we're really dealing with an ACK for a previously sent msg */
1442 if (msg->hdr.size == 0) {
1443 xpc_handle_notify_mq_ack_uv(ch, msg);
1444 xpc_msgqueue_deref(ch);
1445 return;
1446 }
1447
1448 /* we're dealing with a normal message sent via the notify_mq */
1449 ch_uv = &ch->sn.uv;
1450
1451 msg_slot = ch_uv->recv_msg_slots +
1452 (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1453
1454 BUG_ON(msg_slot->hdr.size != 0);
1455
1456 memcpy(msg_slot, msg, msg->hdr.size);
1457
1458 xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1459
1460 if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1461 /*
1462 * If there is an existing idle kthread get it to deliver
1463 * the payload, otherwise we'll have to get the channel mgr
1464 * for this partition to create a kthread to do the delivery.
1465 */
1466 if (atomic_read(&ch->kthreads_idle) > 0)
1467 wake_up_nr(&ch->idle_wq, 1);
1468 else
1469 xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1470 }
1471 xpc_msgqueue_deref(ch);
1472 }
1473
1474 static irqreturn_t
1475 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1476 {
1477 struct xpc_notify_mq_msg_uv *msg;
1478 short partid;
1479 struct xpc_partition *part;
1480
1481 while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1482 NULL) {
1483
1484 partid = msg->hdr.partid;
1485 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1486 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1487 "invalid partid=0x%x in message\n", partid);
1488 } else {
1489 part = &xpc_partitions[partid];
1490
1491 if (xpc_part_ref(part)) {
1492 xpc_handle_notify_mq_msg_uv(part, msg);
1493 xpc_part_deref(part);
1494 }
1495 }
1496
1497 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1498 }
1499
1500 return IRQ_HANDLED;
1501 }
1502
1503 static int
1504 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1505 {
1506 return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1507 }
1508
1509 static void
1510 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1511 {
1512 struct xpc_channel *ch = &part->channels[ch_number];
1513 int ndeliverable_payloads;
1514
1515 xpc_msgqueue_ref(ch);
1516
1517 ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1518
1519 if (ndeliverable_payloads > 0 &&
1520 (ch->flags & XPC_C_CONNECTED) &&
1521 (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1522
1523 xpc_activate_kthreads(ch, ndeliverable_payloads);
1524 }
1525
1526 xpc_msgqueue_deref(ch);
1527 }
1528
1529 static enum xp_retval
1530 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1531 u16 payload_size, u8 notify_type, xpc_notify_func func,
1532 void *key)
1533 {
1534 enum xp_retval ret = xpSuccess;
1535 struct xpc_send_msg_slot_uv *msg_slot = NULL;
1536 struct xpc_notify_mq_msg_uv *msg;
1537 u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1538 size_t msg_size;
1539
1540 DBUG_ON(notify_type != XPC_N_CALL);
1541
1542 msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1543 if (msg_size > ch->entry_size)
1544 return xpPayloadTooBig;
1545
1546 xpc_msgqueue_ref(ch);
1547
1548 if (ch->flags & XPC_C_DISCONNECTING) {
1549 ret = ch->reason;
1550 goto out_1;
1551 }
1552 if (!(ch->flags & XPC_C_CONNECTED)) {
1553 ret = xpNotConnected;
1554 goto out_1;
1555 }
1556
1557 ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1558 if (ret != xpSuccess)
1559 goto out_1;
1560
1561 if (func != NULL) {
1562 atomic_inc(&ch->n_to_notify);
1563
1564 msg_slot->key = key;
1565 smp_wmb(); /* a non-NULL func must hit memory after the key */
1566 msg_slot->func = func;
1567
1568 if (ch->flags & XPC_C_DISCONNECTING) {
1569 ret = ch->reason;
1570 goto out_2;
1571 }
1572 }
1573
1574 msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1575 msg->hdr.partid = xp_partition_id;
1576 msg->hdr.ch_number = ch->number;
1577 msg->hdr.size = msg_size;
1578 msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1579 memcpy(&msg->payload, payload, payload_size);
1580
1581 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1582 msg_size);
1583 if (ret == xpSuccess)
1584 goto out_1;
1585
1586 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1587 out_2:
1588 if (func != NULL) {
1589 /*
1590 * Try to NULL the msg_slot's func field. If we fail, then
1591 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1592 * case we need to pretend we succeeded to send the message
1593 * since the user will get a callout for the disconnect error
1594 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1595 * error returned here will confuse them. Additionally, since
1596 * in this case the channel is being disconnected we don't need
1597 * to put the the msg_slot back on the free list.
1598 */
1599 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1600 ret = xpSuccess;
1601 goto out_1;
1602 }
1603
1604 msg_slot->key = NULL;
1605 atomic_dec(&ch->n_to_notify);
1606 }
1607 xpc_free_msg_slot_uv(ch, msg_slot);
1608 out_1:
1609 xpc_msgqueue_deref(ch);
1610 return ret;
1611 }
1612
1613 /*
1614 * Tell the callers of xpc_send_notify() that the status of their payloads
1615 * is unknown because the channel is now disconnecting.
1616 *
1617 * We don't worry about putting these msg_slots on the free list since the
1618 * msg_slots themselves are about to be kfree'd.
1619 */
1620 static void
1621 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1622 {
1623 struct xpc_send_msg_slot_uv *msg_slot;
1624 int entry;
1625
1626 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1627
1628 for (entry = 0; entry < ch->local_nentries; entry++) {
1629
1630 if (atomic_read(&ch->n_to_notify) == 0)
1631 break;
1632
1633 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1634 if (msg_slot->func != NULL)
1635 xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1636 }
1637 }
1638
1639 /*
1640 * Get the next deliverable message's payload.
1641 */
1642 static void *
1643 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1644 {
1645 struct xpc_fifo_entry_uv *entry;
1646 struct xpc_notify_mq_msg_uv *msg;
1647 void *payload = NULL;
1648
1649 if (!(ch->flags & XPC_C_DISCONNECTING)) {
1650 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1651 if (entry != NULL) {
1652 msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1653 hdr.u.next);
1654 payload = &msg->payload;
1655 }
1656 }
1657 return payload;
1658 }
1659
1660 static void
1661 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1662 {
1663 struct xpc_notify_mq_msg_uv *msg;
1664 enum xp_retval ret;
1665
1666 msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1667
1668 /* return an ACK to the sender of this message */
1669
1670 msg->hdr.partid = xp_partition_id;
1671 msg->hdr.size = 0; /* size of zero indicates this is an ACK */
1672
1673 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1674 sizeof(struct xpc_notify_mq_msghdr_uv));
1675 if (ret != xpSuccess)
1676 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1677 }
1678
1679 static struct xpc_arch_operations xpc_arch_ops_uv = {
1680 .setup_partitions = xpc_setup_partitions_uv,
1681 .teardown_partitions = xpc_teardown_partitions_uv,
1682 .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1683 .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1684 .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1685
1686 .allow_hb = xpc_allow_hb_uv,
1687 .disallow_hb = xpc_disallow_hb_uv,
1688 .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1689 .increment_heartbeat = xpc_increment_heartbeat_uv,
1690 .offline_heartbeat = xpc_offline_heartbeat_uv,
1691 .online_heartbeat = xpc_online_heartbeat_uv,
1692 .heartbeat_init = xpc_heartbeat_init_uv,
1693 .heartbeat_exit = xpc_heartbeat_exit_uv,
1694 .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1695
1696 .request_partition_activation =
1697 xpc_request_partition_activation_uv,
1698 .request_partition_reactivation =
1699 xpc_request_partition_reactivation_uv,
1700 .request_partition_deactivation =
1701 xpc_request_partition_deactivation_uv,
1702 .cancel_partition_deactivation_request =
1703 xpc_cancel_partition_deactivation_request_uv,
1704
1705 .setup_ch_structures = xpc_setup_ch_structures_uv,
1706 .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1707
1708 .make_first_contact = xpc_make_first_contact_uv,
1709
1710 .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1711 .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1712 .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1713 .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1714 .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1715 .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1716 .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1717
1718 .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1719
1720 .setup_msg_structures = xpc_setup_msg_structures_uv,
1721 .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1722
1723 .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1724 .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1725 .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1726 .partition_engaged = xpc_partition_engaged_uv,
1727 .any_partition_engaged = xpc_any_partition_engaged_uv,
1728
1729 .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1730 .send_payload = xpc_send_payload_uv,
1731 .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1732 .received_payload = xpc_received_payload_uv,
1733 .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1734 };
1735
1736 static int
1737 xpc_init_mq_node(int nid)
1738 {
1739 int cpu;
1740
1741 get_online_cpus();
1742
1743 for_each_cpu(cpu, cpumask_of_node(nid)) {
1744 xpc_activate_mq_uv =
1745 xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, nid,
1746 XPC_ACTIVATE_IRQ_NAME,
1747 xpc_handle_activate_IRQ_uv);
1748 if (!IS_ERR(xpc_activate_mq_uv))
1749 break;
1750 }
1751 if (IS_ERR(xpc_activate_mq_uv)) {
1752 put_online_cpus();
1753 return PTR_ERR(xpc_activate_mq_uv);
1754 }
1755
1756 for_each_cpu(cpu, cpumask_of_node(nid)) {
1757 xpc_notify_mq_uv =
1758 xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, nid,
1759 XPC_NOTIFY_IRQ_NAME,
1760 xpc_handle_notify_IRQ_uv);
1761 if (!IS_ERR(xpc_notify_mq_uv))
1762 break;
1763 }
1764 if (IS_ERR(xpc_notify_mq_uv)) {
1765 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1766 put_online_cpus();
1767 return PTR_ERR(xpc_notify_mq_uv);
1768 }
1769
1770 put_online_cpus();
1771 return 0;
1772 }
1773
1774 int
1775 xpc_init_uv(void)
1776 {
1777 int nid;
1778 int ret = 0;
1779
1780 xpc_arch_ops = xpc_arch_ops_uv;
1781
1782 if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1783 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1784 XPC_MSG_HDR_MAX_SIZE);
1785 return -E2BIG;
1786 }
1787
1788 if (xpc_mq_node < 0)
1789 for_each_online_node(nid) {
1790 ret = xpc_init_mq_node(nid);
1791
1792 if (!ret)
1793 break;
1794 }
1795 else
1796 ret = xpc_init_mq_node(xpc_mq_node);
1797
1798 if (ret < 0)
1799 dev_err(xpc_part, "xpc_init_mq_node() returned error=%d\n",
1800 -ret);
1801
1802 return ret;
1803 }
1804
1805 void
1806 xpc_exit_uv(void)
1807 {
1808 xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1809 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1810 }
1811
1812 module_param(xpc_mq_node, int, 0);
1813 MODULE_PARM_DESC(xpc_mq_node, "Node number on which to allocate message queues.");
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