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Staging: strip: delete the driver
[linux/fpc-iii.git] / drivers / misc / sgi-xp / xpc_uv.c
blob1f59ee2226ca4220e470842326ec64fba62377a2
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 <linux/slab.h>
23 #include <asm/uv/uv_hub.h>
24 #if defined CONFIG_X86_64
25 #include <asm/uv/bios.h>
26 #include <asm/uv/uv_irq.h>
27 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
28 #include <asm/sn/intr.h>
29 #include <asm/sn/sn_sal.h>
30 #endif
31 #include "../sgi-gru/gru.h"
32 #include "../sgi-gru/grukservices.h"
33 #include "xpc.h"
34
35 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
36 struct uv_IO_APIC_route_entry {
37 __u64 vector : 8,
38 delivery_mode : 3,
39 dest_mode : 1,
40 delivery_status : 1,
41 polarity : 1,
42 __reserved_1 : 1,
43 trigger : 1,
44 mask : 1,
45 __reserved_2 : 15,
46 dest : 32;
47 };
48 #endif
49
50 static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
51
52 #define XPC_ACTIVATE_MSG_SIZE_UV (1 * GRU_CACHE_LINE_BYTES)
53 #define XPC_ACTIVATE_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
54 XPC_ACTIVATE_MSG_SIZE_UV)
55 #define XPC_ACTIVATE_IRQ_NAME "xpc_activate"
56
57 #define XPC_NOTIFY_MSG_SIZE_UV (2 * GRU_CACHE_LINE_BYTES)
58 #define XPC_NOTIFY_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
59 XPC_NOTIFY_MSG_SIZE_UV)
60 #define XPC_NOTIFY_IRQ_NAME "xpc_notify"
61
62 static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
63 static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
64
65 static int
66 xpc_setup_partitions_uv(void)
67 {
68 short partid;
69 struct xpc_partition_uv *part_uv;
70
71 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
72 part_uv = &xpc_partitions[partid].sn.uv;
73
74 mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
75 spin_lock_init(&part_uv->flags_lock);
76 part_uv->remote_act_state = XPC_P_AS_INACTIVE;
77 }
78 return 0;
79 }
80
81 static void
82 xpc_teardown_partitions_uv(void)
83 {
84 short partid;
85 struct xpc_partition_uv *part_uv;
86 unsigned long irq_flags;
87
88 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
89 part_uv = &xpc_partitions[partid].sn.uv;
90
91 if (part_uv->cached_activate_gru_mq_desc != NULL) {
92 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
93 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
94 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
95 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
96 kfree(part_uv->cached_activate_gru_mq_desc);
97 part_uv->cached_activate_gru_mq_desc = NULL;
98 mutex_unlock(&part_uv->
99 cached_activate_gru_mq_desc_mutex);
100 }
101 }
102 }
103
104 static int
105 xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
106 {
107 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
108
109 #if defined CONFIG_X86_64
110 mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
111 UV_AFFINITY_CPU);
112 if (mq->irq < 0) {
113 dev_err(xpc_part, "uv_setup_irq() returned error=%d\n",
114 -mq->irq);
115 return mq->irq;
116 }
117
118 mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
119
120 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
121 if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
122 mq->irq = SGI_XPC_ACTIVATE;
123 else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
124 mq->irq = SGI_XPC_NOTIFY;
125 else
126 return -EINVAL;
127
128 mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
129 uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
130 #else
131 #error not a supported configuration
132 #endif
133
134 return 0;
135 }
136
137 static void
138 xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
139 {
140 #if defined CONFIG_X86_64
141 uv_teardown_irq(mq->irq);
142
143 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
144 int mmr_pnode;
145 unsigned long mmr_value;
146
147 mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
148 mmr_value = 1UL << 16;
149
150 uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
151 #else
152 #error not a supported configuration
153 #endif
154 }
155
156 static int
157 xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
158 {
159 int ret;
160
161 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
162 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
163
164 ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
165 mq->order, &mq->mmr_offset);
166 if (ret < 0) {
167 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
168 ret);
169 return -EBUSY;
170 }
171 #elif defined CONFIG_X86_64
172 ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
173 mq->order, &mq->mmr_offset);
174 if (ret < 0) {
175 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
176 "ret=%d\n", ret);
177 return ret;
178 }
179 #else
180 #error not a supported configuration
181 #endif
182
183 mq->watchlist_num = ret;
184 return 0;
185 }
186
187 static void
188 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
189 {
190 int ret;
191 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
192
193 #if defined CONFIG_X86_64
194 ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
195 BUG_ON(ret != BIOS_STATUS_SUCCESS);
196 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
197 ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
198 BUG_ON(ret != SALRET_OK);
199 #else
200 #error not a supported configuration
201 #endif
202 }
203
204 static struct xpc_gru_mq_uv *
205 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
206 irq_handler_t irq_handler)
207 {
208 enum xp_retval xp_ret;
209 int ret;
210 int nid;
211 int nasid;
212 int pg_order;
213 struct page *page;
214 struct xpc_gru_mq_uv *mq;
215 struct uv_IO_APIC_route_entry *mmr_value;
216
217 mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
218 if (mq == NULL) {
219 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
220 "a xpc_gru_mq_uv structure\n");
221 ret = -ENOMEM;
222 goto out_0;
223 }
224
225 mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
226 GFP_KERNEL);
227 if (mq->gru_mq_desc == NULL) {
228 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
229 "a gru_message_queue_desc structure\n");
230 ret = -ENOMEM;
231 goto out_1;
232 }
233
234 pg_order = get_order(mq_size);
235 mq->order = pg_order + PAGE_SHIFT;
236 mq_size = 1UL << mq->order;
237
238 mq->mmr_blade = uv_cpu_to_blade_id(cpu);
239
240 nid = cpu_to_node(cpu);
241 page = alloc_pages_exact_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
242 pg_order);
243 if (page == NULL) {
244 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
245 "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
246 ret = -ENOMEM;
247 goto out_2;
248 }
249 mq->address = page_address(page);
250
251 /* enable generation of irq when GRU mq operation occurs to this mq */
252 ret = xpc_gru_mq_watchlist_alloc_uv(mq);
253 if (ret != 0)
254 goto out_3;
255
256 ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
257 if (ret != 0)
258 goto out_4;
259
260 ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
261 if (ret != 0) {
262 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
263 mq->irq, -ret);
264 goto out_5;
265 }
266
267 nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
268
269 mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
270 ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
271 nasid, mmr_value->vector, mmr_value->dest);
272 if (ret != 0) {
273 dev_err(xpc_part, "gru_create_message_queue() returned "
274 "error=%d\n", ret);
275 ret = -EINVAL;
276 goto out_6;
277 }
278
279 /* allow other partitions to access this GRU mq */
280 xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
281 if (xp_ret != xpSuccess) {
282 ret = -EACCES;
283 goto out_6;
284 }
285
286 return mq;
287
288 /* something went wrong */
289 out_6:
290 free_irq(mq->irq, NULL);
291 out_5:
292 xpc_release_gru_mq_irq_uv(mq);
293 out_4:
294 xpc_gru_mq_watchlist_free_uv(mq);
295 out_3:
296 free_pages((unsigned long)mq->address, pg_order);
297 out_2:
298 kfree(mq->gru_mq_desc);
299 out_1:
300 kfree(mq);
301 out_0:
302 return ERR_PTR(ret);
303 }
304
305 static void
306 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
307 {
308 unsigned int mq_size;
309 int pg_order;
310 int ret;
311
312 /* disallow other partitions to access GRU mq */
313 mq_size = 1UL << mq->order;
314 ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
315 BUG_ON(ret != xpSuccess);
316
317 /* unregister irq handler and release mq irq/vector mapping */
318 free_irq(mq->irq, NULL);
319 xpc_release_gru_mq_irq_uv(mq);
320
321 /* disable generation of irq when GRU mq op occurs to this mq */
322 xpc_gru_mq_watchlist_free_uv(mq);
323
324 pg_order = mq->order - PAGE_SHIFT;
325 free_pages((unsigned long)mq->address, pg_order);
326
327 kfree(mq);
328 }
329
330 static enum xp_retval
331 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
332 size_t msg_size)
333 {
334 enum xp_retval xp_ret;
335 int ret;
336
337 while (1) {
338 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
339 if (ret == MQE_OK) {
340 xp_ret = xpSuccess;
341 break;
342 }
343
344 if (ret == MQE_QUEUE_FULL) {
345 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
346 "error=MQE_QUEUE_FULL\n");
347 /* !!! handle QLimit reached; delay & try again */
348 /* ??? Do we add a limit to the number of retries? */
349 (void)msleep_interruptible(10);
350 } else if (ret == MQE_CONGESTION) {
351 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
352 "error=MQE_CONGESTION\n");
353 /* !!! handle LB Overflow; simply try again */
354 /* ??? Do we add a limit to the number of retries? */
355 } else {
356 /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
357 dev_err(xpc_chan, "gru_send_message_gpa() returned "
358 "error=%d\n", ret);
359 xp_ret = xpGruSendMqError;
360 break;
361 }
362 }
363 return xp_ret;
364 }
365
366 static void
367 xpc_process_activate_IRQ_rcvd_uv(void)
368 {
369 unsigned long irq_flags;
370 short partid;
371 struct xpc_partition *part;
372 u8 act_state_req;
373
374 DBUG_ON(xpc_activate_IRQ_rcvd == 0);
375
376 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
377 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
378 part = &xpc_partitions[partid];
379
380 if (part->sn.uv.act_state_req == 0)
381 continue;
382
383 xpc_activate_IRQ_rcvd--;
384 BUG_ON(xpc_activate_IRQ_rcvd < 0);
385
386 act_state_req = part->sn.uv.act_state_req;
387 part->sn.uv.act_state_req = 0;
388 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
389
390 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
391 if (part->act_state == XPC_P_AS_INACTIVE)
392 xpc_activate_partition(part);
393 else if (part->act_state == XPC_P_AS_DEACTIVATING)
394 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
395
396 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
397 if (part->act_state == XPC_P_AS_INACTIVE)
398 xpc_activate_partition(part);
399 else
400 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
401
402 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
403 XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
404
405 } else {
406 BUG();
407 }
408
409 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
410 if (xpc_activate_IRQ_rcvd == 0)
411 break;
412 }
413 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
414
415 }
416
417 static void
418 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
419 struct xpc_activate_mq_msghdr_uv *msg_hdr,
420 int *wakeup_hb_checker)
421 {
422 unsigned long irq_flags;
423 struct xpc_partition_uv *part_uv = &part->sn.uv;
424 struct xpc_openclose_args *args;
425
426 part_uv->remote_act_state = msg_hdr->act_state;
427
428 switch (msg_hdr->type) {
429 case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
430 /* syncing of remote_act_state was just done above */
431 break;
432
433 case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
434 struct xpc_activate_mq_msg_activate_req_uv *msg;
435
436 /*
437 * ??? Do we deal here with ts_jiffies being different
438 * ??? if act_state != XPC_P_AS_INACTIVE instead of
439 * ??? below?
440 */
441 msg = container_of(msg_hdr, struct
442 xpc_activate_mq_msg_activate_req_uv, hdr);
443
444 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
445 if (part_uv->act_state_req == 0)
446 xpc_activate_IRQ_rcvd++;
447 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
448 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
449 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
450 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
451
452 if (msg->activate_gru_mq_desc_gpa !=
453 part_uv->activate_gru_mq_desc_gpa) {
454 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
455 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
456 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
457 part_uv->activate_gru_mq_desc_gpa =
458 msg->activate_gru_mq_desc_gpa;
459 }
460 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
461
462 (*wakeup_hb_checker)++;
463 break;
464 }
465 case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
466 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
467
468 msg = container_of(msg_hdr, struct
469 xpc_activate_mq_msg_deactivate_req_uv, hdr);
470
471 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
472 if (part_uv->act_state_req == 0)
473 xpc_activate_IRQ_rcvd++;
474 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
475 part_uv->reason = msg->reason;
476 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
477
478 (*wakeup_hb_checker)++;
479 return;
480 }
481 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
482 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
483
484 msg = container_of(msg_hdr, struct
485 xpc_activate_mq_msg_chctl_closerequest_uv,
486 hdr);
487 args = &part->remote_openclose_args[msg->ch_number];
488 args->reason = msg->reason;
489
490 spin_lock_irqsave(&part->chctl_lock, irq_flags);
491 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
492 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
493
494 xpc_wakeup_channel_mgr(part);
495 break;
496 }
497 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
498 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
499
500 msg = container_of(msg_hdr, struct
501 xpc_activate_mq_msg_chctl_closereply_uv,
502 hdr);
503
504 spin_lock_irqsave(&part->chctl_lock, irq_flags);
505 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
506 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
507
508 xpc_wakeup_channel_mgr(part);
509 break;
510 }
511 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
512 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
513
514 msg = container_of(msg_hdr, struct
515 xpc_activate_mq_msg_chctl_openrequest_uv,
516 hdr);
517 args = &part->remote_openclose_args[msg->ch_number];
518 args->entry_size = msg->entry_size;
519 args->local_nentries = msg->local_nentries;
520
521 spin_lock_irqsave(&part->chctl_lock, irq_flags);
522 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
523 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
524
525 xpc_wakeup_channel_mgr(part);
526 break;
527 }
528 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
529 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
530
531 msg = container_of(msg_hdr, struct
532 xpc_activate_mq_msg_chctl_openreply_uv, hdr);
533 args = &part->remote_openclose_args[msg->ch_number];
534 args->remote_nentries = msg->remote_nentries;
535 args->local_nentries = msg->local_nentries;
536 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
537
538 spin_lock_irqsave(&part->chctl_lock, irq_flags);
539 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
540 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
541
542 xpc_wakeup_channel_mgr(part);
543 break;
544 }
545 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
546 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
547
548 msg = container_of(msg_hdr, struct
549 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
550 spin_lock_irqsave(&part->chctl_lock, irq_flags);
551 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
552 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
553
554 xpc_wakeup_channel_mgr(part);
555 }
556 case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
557 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
558 part_uv->flags |= XPC_P_ENGAGED_UV;
559 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
560 break;
561
562 case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
563 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
564 part_uv->flags &= ~XPC_P_ENGAGED_UV;
565 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
566 break;
567
568 default:
569 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
570 "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
571
572 /* get hb checker to deactivate from the remote partition */
573 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
574 if (part_uv->act_state_req == 0)
575 xpc_activate_IRQ_rcvd++;
576 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
577 part_uv->reason = xpBadMsgType;
578 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
579
580 (*wakeup_hb_checker)++;
581 return;
582 }
583
584 if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
585 part->remote_rp_ts_jiffies != 0) {
586 /*
587 * ??? Does what we do here need to be sensitive to
588 * ??? act_state or remote_act_state?
589 */
590 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
591 if (part_uv->act_state_req == 0)
592 xpc_activate_IRQ_rcvd++;
593 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
594 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
595
596 (*wakeup_hb_checker)++;
597 }
598 }
599
600 static irqreturn_t
601 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
602 {
603 struct xpc_activate_mq_msghdr_uv *msg_hdr;
604 short partid;
605 struct xpc_partition *part;
606 int wakeup_hb_checker = 0;
607 int part_referenced;
608
609 while (1) {
610 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
611 if (msg_hdr == NULL)
612 break;
613
614 partid = msg_hdr->partid;
615 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
616 dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
617 "received invalid partid=0x%x in message\n",
618 partid);
619 } else {
620 part = &xpc_partitions[partid];
621
622 part_referenced = xpc_part_ref(part);
623 xpc_handle_activate_mq_msg_uv(part, msg_hdr,
624 &wakeup_hb_checker);
625 if (part_referenced)
626 xpc_part_deref(part);
627 }
628
629 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
630 }
631
632 if (wakeup_hb_checker)
633 wake_up_interruptible(&xpc_activate_IRQ_wq);
634
635 return IRQ_HANDLED;
636 }
637
638 static enum xp_retval
639 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
640 unsigned long gru_mq_desc_gpa)
641 {
642 enum xp_retval ret;
643
644 ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
645 sizeof(struct gru_message_queue_desc));
646 if (ret == xpSuccess)
647 gru_mq_desc->mq = NULL;
648
649 return ret;
650 }
651
652 static enum xp_retval
653 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
654 int msg_type)
655 {
656 struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
657 struct xpc_partition_uv *part_uv = &part->sn.uv;
658 struct gru_message_queue_desc *gru_mq_desc;
659 unsigned long irq_flags;
660 enum xp_retval ret;
661
662 DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
663
664 msg_hdr->type = msg_type;
665 msg_hdr->partid = xp_partition_id;
666 msg_hdr->act_state = part->act_state;
667 msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
668
669 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
670 again:
671 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
672 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
673 if (gru_mq_desc == NULL) {
674 gru_mq_desc = kmalloc(sizeof(struct
675 gru_message_queue_desc),
676 GFP_KERNEL);
677 if (gru_mq_desc == NULL) {
678 ret = xpNoMemory;
679 goto done;
680 }
681 part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
682 }
683
684 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
685 part_uv->
686 activate_gru_mq_desc_gpa);
687 if (ret != xpSuccess)
688 goto done;
689
690 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
691 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
692 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
693 }
694
695 /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
696 ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
697 msg_size);
698 if (ret != xpSuccess) {
699 smp_rmb(); /* ensure a fresh copy of part_uv->flags */
700 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
701 goto again;
702 }
703 done:
704 mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
705 return ret;
706 }
707
708 static void
709 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
710 size_t msg_size, int msg_type)
711 {
712 enum xp_retval ret;
713
714 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
715 if (unlikely(ret != xpSuccess))
716 XPC_DEACTIVATE_PARTITION(part, ret);
717 }
718
719 static void
720 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
721 void *msg, size_t msg_size, int msg_type)
722 {
723 struct xpc_partition *part = &xpc_partitions[ch->partid];
724 enum xp_retval ret;
725
726 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
727 if (unlikely(ret != xpSuccess)) {
728 if (irq_flags != NULL)
729 spin_unlock_irqrestore(&ch->lock, *irq_flags);
730
731 XPC_DEACTIVATE_PARTITION(part, ret);
732
733 if (irq_flags != NULL)
734 spin_lock_irqsave(&ch->lock, *irq_flags);
735 }
736 }
737
738 static void
739 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
740 {
741 unsigned long irq_flags;
742 struct xpc_partition_uv *part_uv = &part->sn.uv;
743
744 /*
745 * !!! Make our side think that the remote partition sent an activate
746 * !!! mq message our way by doing what the activate IRQ handler would
747 * !!! do had one really been sent.
748 */
749
750 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
751 if (part_uv->act_state_req == 0)
752 xpc_activate_IRQ_rcvd++;
753 part_uv->act_state_req = act_state_req;
754 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
755
756 wake_up_interruptible(&xpc_activate_IRQ_wq);
757 }
758
759 static enum xp_retval
760 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
761 size_t *len)
762 {
763 s64 status;
764 enum xp_retval ret;
765
766 #if defined CONFIG_X86_64
767 status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
768 (u64 *)len);
769 if (status == BIOS_STATUS_SUCCESS)
770 ret = xpSuccess;
771 else if (status == BIOS_STATUS_MORE_PASSES)
772 ret = xpNeedMoreInfo;
773 else
774 ret = xpBiosError;
775
776 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
777 status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
778 if (status == SALRET_OK)
779 ret = xpSuccess;
780 else if (status == SALRET_MORE_PASSES)
781 ret = xpNeedMoreInfo;
782 else
783 ret = xpSalError;
784
785 #else
786 #error not a supported configuration
787 #endif
788
789 return ret;
790 }
791
792 static int
793 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
794 {
795 xpc_heartbeat_uv =
796 &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
797 rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
798 rp->sn.uv.activate_gru_mq_desc_gpa =
799 uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
800 return 0;
801 }
802
803 static void
804 xpc_allow_hb_uv(short partid)
805 {
806 }
807
808 static void
809 xpc_disallow_hb_uv(short partid)
810 {
811 }
812
813 static void
814 xpc_disallow_all_hbs_uv(void)
815 {
816 }
817
818 static void
819 xpc_increment_heartbeat_uv(void)
820 {
821 xpc_heartbeat_uv->value++;
822 }
823
824 static void
825 xpc_offline_heartbeat_uv(void)
826 {
827 xpc_increment_heartbeat_uv();
828 xpc_heartbeat_uv->offline = 1;
829 }
830
831 static void
832 xpc_online_heartbeat_uv(void)
833 {
834 xpc_increment_heartbeat_uv();
835 xpc_heartbeat_uv->offline = 0;
836 }
837
838 static void
839 xpc_heartbeat_init_uv(void)
840 {
841 xpc_heartbeat_uv->value = 1;
842 xpc_heartbeat_uv->offline = 0;
843 }
844
845 static void
846 xpc_heartbeat_exit_uv(void)
847 {
848 xpc_offline_heartbeat_uv();
849 }
850
851 static enum xp_retval
852 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
853 {
854 struct xpc_partition_uv *part_uv = &part->sn.uv;
855 enum xp_retval ret;
856
857 ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
858 part_uv->heartbeat_gpa,
859 sizeof(struct xpc_heartbeat_uv));
860 if (ret != xpSuccess)
861 return ret;
862
863 if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
864 !part_uv->cached_heartbeat.offline) {
865
866 ret = xpNoHeartbeat;
867 } else {
868 part->last_heartbeat = part_uv->cached_heartbeat.value;
869 }
870 return ret;
871 }
872
873 static void
874 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
875 unsigned long remote_rp_gpa, int nasid)
876 {
877 short partid = remote_rp->SAL_partid;
878 struct xpc_partition *part = &xpc_partitions[partid];
879 struct xpc_activate_mq_msg_activate_req_uv msg;
880
881 part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
882 part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
883 part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
884 part->sn.uv.activate_gru_mq_desc_gpa =
885 remote_rp->sn.uv.activate_gru_mq_desc_gpa;
886
887 /*
888 * ??? Is it a good idea to make this conditional on what is
889 * ??? potentially stale state information?
890 */
891 if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
892 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
893 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
894 msg.activate_gru_mq_desc_gpa =
895 xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
896 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
897 XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
898 }
899
900 if (part->act_state == XPC_P_AS_INACTIVE)
901 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
902 }
903
904 static void
905 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
906 {
907 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
908 }
909
910 static void
911 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
912 {
913 struct xpc_activate_mq_msg_deactivate_req_uv msg;
914
915 /*
916 * ??? Is it a good idea to make this conditional on what is
917 * ??? potentially stale state information?
918 */
919 if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
920 part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
921
922 msg.reason = part->reason;
923 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
924 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
925 }
926 }
927
928 static void
929 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
930 {
931 /* nothing needs to be done */
932 return;
933 }
934
935 static void
936 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
937 {
938 head->first = NULL;
939 head->last = NULL;
940 spin_lock_init(&head->lock);
941 head->n_entries = 0;
942 }
943
944 static void *
945 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
946 {
947 unsigned long irq_flags;
948 struct xpc_fifo_entry_uv *first;
949
950 spin_lock_irqsave(&head->lock, irq_flags);
951 first = head->first;
952 if (head->first != NULL) {
953 head->first = first->next;
954 if (head->first == NULL)
955 head->last = NULL;
956
957 head->n_entries--;
958 BUG_ON(head->n_entries < 0);
959
960 first->next = NULL;
961 }
962 spin_unlock_irqrestore(&head->lock, irq_flags);
963 return first;
964 }
965
966 static void
967 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
968 struct xpc_fifo_entry_uv *last)
969 {
970 unsigned long irq_flags;
971
972 last->next = NULL;
973 spin_lock_irqsave(&head->lock, irq_flags);
974 if (head->last != NULL)
975 head->last->next = last;
976 else
977 head->first = last;
978 head->last = last;
979 head->n_entries++;
980 spin_unlock_irqrestore(&head->lock, irq_flags);
981 }
982
983 static int
984 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
985 {
986 return head->n_entries;
987 }
988
989 /*
990 * Setup the channel structures that are uv specific.
991 */
992 static enum xp_retval
993 xpc_setup_ch_structures_uv(struct xpc_partition *part)
994 {
995 struct xpc_channel_uv *ch_uv;
996 int ch_number;
997
998 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
999 ch_uv = &part->channels[ch_number].sn.uv;
1000
1001 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1002 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1003 }
1004
1005 return xpSuccess;
1006 }
1007
1008 /*
1009 * Teardown the channel structures that are uv specific.
1010 */
1011 static void
1012 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1013 {
1014 /* nothing needs to be done */
1015 return;
1016 }
1017
1018 static enum xp_retval
1019 xpc_make_first_contact_uv(struct xpc_partition *part)
1020 {
1021 struct xpc_activate_mq_msg_uv msg;
1022
1023 /*
1024 * We send a sync msg to get the remote partition's remote_act_state
1025 * updated to our current act_state which at this point should
1026 * be XPC_P_AS_ACTIVATING.
1027 */
1028 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1029 XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1030
1031 while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1032 (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1033
1034 dev_dbg(xpc_part, "waiting to make first contact with "
1035 "partition %d\n", XPC_PARTID(part));
1036
1037 /* wait a 1/4 of a second or so */
1038 (void)msleep_interruptible(250);
1039
1040 if (part->act_state == XPC_P_AS_DEACTIVATING)
1041 return part->reason;
1042 }
1043
1044 return xpSuccess;
1045 }
1046
1047 static u64
1048 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1049 {
1050 unsigned long irq_flags;
1051 union xpc_channel_ctl_flags chctl;
1052
1053 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1054 chctl = part->chctl;
1055 if (chctl.all_flags != 0)
1056 part->chctl.all_flags = 0;
1057
1058 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1059 return chctl.all_flags;
1060 }
1061
1062 static enum xp_retval
1063 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1064 {
1065 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1066 struct xpc_send_msg_slot_uv *msg_slot;
1067 unsigned long irq_flags;
1068 int nentries;
1069 int entry;
1070 size_t nbytes;
1071
1072 for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1073 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1074 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1075 if (ch_uv->send_msg_slots == NULL)
1076 continue;
1077
1078 for (entry = 0; entry < nentries; entry++) {
1079 msg_slot = &ch_uv->send_msg_slots[entry];
1080
1081 msg_slot->msg_slot_number = entry;
1082 xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1083 &msg_slot->next);
1084 }
1085
1086 spin_lock_irqsave(&ch->lock, irq_flags);
1087 if (nentries < ch->local_nentries)
1088 ch->local_nentries = nentries;
1089 spin_unlock_irqrestore(&ch->lock, irq_flags);
1090 return xpSuccess;
1091 }
1092
1093 return xpNoMemory;
1094 }
1095
1096 static enum xp_retval
1097 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1098 {
1099 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1100 struct xpc_notify_mq_msg_uv *msg_slot;
1101 unsigned long irq_flags;
1102 int nentries;
1103 int entry;
1104 size_t nbytes;
1105
1106 for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1107 nbytes = nentries * ch->entry_size;
1108 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1109 if (ch_uv->recv_msg_slots == NULL)
1110 continue;
1111
1112 for (entry = 0; entry < nentries; entry++) {
1113 msg_slot = ch_uv->recv_msg_slots +
1114 entry * ch->entry_size;
1115
1116 msg_slot->hdr.msg_slot_number = entry;
1117 }
1118
1119 spin_lock_irqsave(&ch->lock, irq_flags);
1120 if (nentries < ch->remote_nentries)
1121 ch->remote_nentries = nentries;
1122 spin_unlock_irqrestore(&ch->lock, irq_flags);
1123 return xpSuccess;
1124 }
1125
1126 return xpNoMemory;
1127 }
1128
1129 /*
1130 * Allocate msg_slots associated with the channel.
1131 */
1132 static enum xp_retval
1133 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1134 {
1135 static enum xp_retval ret;
1136 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1137
1138 DBUG_ON(ch->flags & XPC_C_SETUP);
1139
1140 ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1141 gru_message_queue_desc),
1142 GFP_KERNEL);
1143 if (ch_uv->cached_notify_gru_mq_desc == NULL)
1144 return xpNoMemory;
1145
1146 ret = xpc_allocate_send_msg_slot_uv(ch);
1147 if (ret == xpSuccess) {
1148
1149 ret = xpc_allocate_recv_msg_slot_uv(ch);
1150 if (ret != xpSuccess) {
1151 kfree(ch_uv->send_msg_slots);
1152 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1153 }
1154 }
1155 return ret;
1156 }
1157
1158 /*
1159 * Free up msg_slots and clear other stuff that were setup for the specified
1160 * channel.
1161 */
1162 static void
1163 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1164 {
1165 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1166
1167 DBUG_ON(!spin_is_locked(&ch->lock));
1168
1169 kfree(ch_uv->cached_notify_gru_mq_desc);
1170 ch_uv->cached_notify_gru_mq_desc = NULL;
1171
1172 if (ch->flags & XPC_C_SETUP) {
1173 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1174 kfree(ch_uv->send_msg_slots);
1175 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1176 kfree(ch_uv->recv_msg_slots);
1177 }
1178 }
1179
1180 static void
1181 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1182 {
1183 struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1184
1185 msg.ch_number = ch->number;
1186 msg.reason = ch->reason;
1187 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1188 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1189 }
1190
1191 static void
1192 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1193 {
1194 struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1195
1196 msg.ch_number = ch->number;
1197 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1198 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1199 }
1200
1201 static void
1202 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1203 {
1204 struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1205
1206 msg.ch_number = ch->number;
1207 msg.entry_size = ch->entry_size;
1208 msg.local_nentries = ch->local_nentries;
1209 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1210 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1211 }
1212
1213 static void
1214 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1215 {
1216 struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1217
1218 msg.ch_number = ch->number;
1219 msg.local_nentries = ch->local_nentries;
1220 msg.remote_nentries = ch->remote_nentries;
1221 msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1222 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1223 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1224 }
1225
1226 static void
1227 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1228 {
1229 struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1230
1231 msg.ch_number = ch->number;
1232 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1233 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1234 }
1235
1236 static void
1237 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1238 {
1239 unsigned long irq_flags;
1240
1241 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1242 part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1243 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1244
1245 xpc_wakeup_channel_mgr(part);
1246 }
1247
1248 static enum xp_retval
1249 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1250 unsigned long gru_mq_desc_gpa)
1251 {
1252 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1253
1254 DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1255 return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1256 gru_mq_desc_gpa);
1257 }
1258
1259 static void
1260 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1261 {
1262 struct xpc_activate_mq_msg_uv msg;
1263
1264 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1265 XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1266 }
1267
1268 static void
1269 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1270 {
1271 struct xpc_activate_mq_msg_uv msg;
1272
1273 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1274 XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1275 }
1276
1277 static void
1278 xpc_assume_partition_disengaged_uv(short partid)
1279 {
1280 struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1281 unsigned long irq_flags;
1282
1283 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1284 part_uv->flags &= ~XPC_P_ENGAGED_UV;
1285 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1286 }
1287
1288 static int
1289 xpc_partition_engaged_uv(short partid)
1290 {
1291 return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1292 }
1293
1294 static int
1295 xpc_any_partition_engaged_uv(void)
1296 {
1297 struct xpc_partition_uv *part_uv;
1298 short partid;
1299
1300 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1301 part_uv = &xpc_partitions[partid].sn.uv;
1302 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1303 return 1;
1304 }
1305 return 0;
1306 }
1307
1308 static enum xp_retval
1309 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1310 struct xpc_send_msg_slot_uv **address_of_msg_slot)
1311 {
1312 enum xp_retval ret;
1313 struct xpc_send_msg_slot_uv *msg_slot;
1314 struct xpc_fifo_entry_uv *entry;
1315
1316 while (1) {
1317 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1318 if (entry != NULL)
1319 break;
1320
1321 if (flags & XPC_NOWAIT)
1322 return xpNoWait;
1323
1324 ret = xpc_allocate_msg_wait(ch);
1325 if (ret != xpInterrupted && ret != xpTimeout)
1326 return ret;
1327 }
1328
1329 msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1330 *address_of_msg_slot = msg_slot;
1331 return xpSuccess;
1332 }
1333
1334 static void
1335 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1336 struct xpc_send_msg_slot_uv *msg_slot)
1337 {
1338 xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1339
1340 /* wakeup anyone waiting for a free msg slot */
1341 if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1342 wake_up(&ch->msg_allocate_wq);
1343 }
1344
1345 static void
1346 xpc_notify_sender_uv(struct xpc_channel *ch,
1347 struct xpc_send_msg_slot_uv *msg_slot,
1348 enum xp_retval reason)
1349 {
1350 xpc_notify_func func = msg_slot->func;
1351
1352 if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1353
1354 atomic_dec(&ch->n_to_notify);
1355
1356 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1357 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1358 msg_slot->msg_slot_number, ch->partid, ch->number);
1359
1360 func(reason, ch->partid, ch->number, msg_slot->key);
1361
1362 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1363 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1364 msg_slot->msg_slot_number, ch->partid, ch->number);
1365 }
1366 }
1367
1368 static void
1369 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1370 struct xpc_notify_mq_msg_uv *msg)
1371 {
1372 struct xpc_send_msg_slot_uv *msg_slot;
1373 int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1374
1375 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1376
1377 BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1378 msg_slot->msg_slot_number += ch->local_nentries;
1379
1380 if (msg_slot->func != NULL)
1381 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1382
1383 xpc_free_msg_slot_uv(ch, msg_slot);
1384 }
1385
1386 static void
1387 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1388 struct xpc_notify_mq_msg_uv *msg)
1389 {
1390 struct xpc_partition_uv *part_uv = &part->sn.uv;
1391 struct xpc_channel *ch;
1392 struct xpc_channel_uv *ch_uv;
1393 struct xpc_notify_mq_msg_uv *msg_slot;
1394 unsigned long irq_flags;
1395 int ch_number = msg->hdr.ch_number;
1396
1397 if (unlikely(ch_number >= part->nchannels)) {
1398 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1399 "channel number=0x%x in message from partid=%d\n",
1400 ch_number, XPC_PARTID(part));
1401
1402 /* get hb checker to deactivate from the remote partition */
1403 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1404 if (part_uv->act_state_req == 0)
1405 xpc_activate_IRQ_rcvd++;
1406 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1407 part_uv->reason = xpBadChannelNumber;
1408 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1409
1410 wake_up_interruptible(&xpc_activate_IRQ_wq);
1411 return;
1412 }
1413
1414 ch = &part->channels[ch_number];
1415 xpc_msgqueue_ref(ch);
1416
1417 if (!(ch->flags & XPC_C_CONNECTED)) {
1418 xpc_msgqueue_deref(ch);
1419 return;
1420 }
1421
1422 /* see if we're really dealing with an ACK for a previously sent msg */
1423 if (msg->hdr.size == 0) {
1424 xpc_handle_notify_mq_ack_uv(ch, msg);
1425 xpc_msgqueue_deref(ch);
1426 return;
1427 }
1428
1429 /* we're dealing with a normal message sent via the notify_mq */
1430 ch_uv = &ch->sn.uv;
1431
1432 msg_slot = ch_uv->recv_msg_slots +
1433 (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1434
1435 BUG_ON(msg_slot->hdr.size != 0);
1436
1437 memcpy(msg_slot, msg, msg->hdr.size);
1438
1439 xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1440
1441 if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1442 /*
1443 * If there is an existing idle kthread get it to deliver
1444 * the payload, otherwise we'll have to get the channel mgr
1445 * for this partition to create a kthread to do the delivery.
1446 */
1447 if (atomic_read(&ch->kthreads_idle) > 0)
1448 wake_up_nr(&ch->idle_wq, 1);
1449 else
1450 xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1451 }
1452 xpc_msgqueue_deref(ch);
1453 }
1454
1455 static irqreturn_t
1456 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1457 {
1458 struct xpc_notify_mq_msg_uv *msg;
1459 short partid;
1460 struct xpc_partition *part;
1461
1462 while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1463 NULL) {
1464
1465 partid = msg->hdr.partid;
1466 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1467 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1468 "invalid partid=0x%x in message\n", partid);
1469 } else {
1470 part = &xpc_partitions[partid];
1471
1472 if (xpc_part_ref(part)) {
1473 xpc_handle_notify_mq_msg_uv(part, msg);
1474 xpc_part_deref(part);
1475 }
1476 }
1477
1478 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1479 }
1480
1481 return IRQ_HANDLED;
1482 }
1483
1484 static int
1485 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1486 {
1487 return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1488 }
1489
1490 static void
1491 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1492 {
1493 struct xpc_channel *ch = &part->channels[ch_number];
1494 int ndeliverable_payloads;
1495
1496 xpc_msgqueue_ref(ch);
1497
1498 ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1499
1500 if (ndeliverable_payloads > 0 &&
1501 (ch->flags & XPC_C_CONNECTED) &&
1502 (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1503
1504 xpc_activate_kthreads(ch, ndeliverable_payloads);
1505 }
1506
1507 xpc_msgqueue_deref(ch);
1508 }
1509
1510 static enum xp_retval
1511 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1512 u16 payload_size, u8 notify_type, xpc_notify_func func,
1513 void *key)
1514 {
1515 enum xp_retval ret = xpSuccess;
1516 struct xpc_send_msg_slot_uv *msg_slot = NULL;
1517 struct xpc_notify_mq_msg_uv *msg;
1518 u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1519 size_t msg_size;
1520
1521 DBUG_ON(notify_type != XPC_N_CALL);
1522
1523 msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1524 if (msg_size > ch->entry_size)
1525 return xpPayloadTooBig;
1526
1527 xpc_msgqueue_ref(ch);
1528
1529 if (ch->flags & XPC_C_DISCONNECTING) {
1530 ret = ch->reason;
1531 goto out_1;
1532 }
1533 if (!(ch->flags & XPC_C_CONNECTED)) {
1534 ret = xpNotConnected;
1535 goto out_1;
1536 }
1537
1538 ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1539 if (ret != xpSuccess)
1540 goto out_1;
1541
1542 if (func != NULL) {
1543 atomic_inc(&ch->n_to_notify);
1544
1545 msg_slot->key = key;
1546 smp_wmb(); /* a non-NULL func must hit memory after the key */
1547 msg_slot->func = func;
1548
1549 if (ch->flags & XPC_C_DISCONNECTING) {
1550 ret = ch->reason;
1551 goto out_2;
1552 }
1553 }
1554
1555 msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1556 msg->hdr.partid = xp_partition_id;
1557 msg->hdr.ch_number = ch->number;
1558 msg->hdr.size = msg_size;
1559 msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1560 memcpy(&msg->payload, payload, payload_size);
1561
1562 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1563 msg_size);
1564 if (ret == xpSuccess)
1565 goto out_1;
1566
1567 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1568 out_2:
1569 if (func != NULL) {
1570 /*
1571 * Try to NULL the msg_slot's func field. If we fail, then
1572 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1573 * case we need to pretend we succeeded to send the message
1574 * since the user will get a callout for the disconnect error
1575 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1576 * error returned here will confuse them. Additionally, since
1577 * in this case the channel is being disconnected we don't need
1578 * to put the the msg_slot back on the free list.
1579 */
1580 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1581 ret = xpSuccess;
1582 goto out_1;
1583 }
1584
1585 msg_slot->key = NULL;
1586 atomic_dec(&ch->n_to_notify);
1587 }
1588 xpc_free_msg_slot_uv(ch, msg_slot);
1589 out_1:
1590 xpc_msgqueue_deref(ch);
1591 return ret;
1592 }
1593
1594 /*
1595 * Tell the callers of xpc_send_notify() that the status of their payloads
1596 * is unknown because the channel is now disconnecting.
1597 *
1598 * We don't worry about putting these msg_slots on the free list since the
1599 * msg_slots themselves are about to be kfree'd.
1600 */
1601 static void
1602 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1603 {
1604 struct xpc_send_msg_slot_uv *msg_slot;
1605 int entry;
1606
1607 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1608
1609 for (entry = 0; entry < ch->local_nentries; entry++) {
1610
1611 if (atomic_read(&ch->n_to_notify) == 0)
1612 break;
1613
1614 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1615 if (msg_slot->func != NULL)
1616 xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1617 }
1618 }
1619
1620 /*
1621 * Get the next deliverable message's payload.
1622 */
1623 static void *
1624 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1625 {
1626 struct xpc_fifo_entry_uv *entry;
1627 struct xpc_notify_mq_msg_uv *msg;
1628 void *payload = NULL;
1629
1630 if (!(ch->flags & XPC_C_DISCONNECTING)) {
1631 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1632 if (entry != NULL) {
1633 msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1634 hdr.u.next);
1635 payload = &msg->payload;
1636 }
1637 }
1638 return payload;
1639 }
1640
1641 static void
1642 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1643 {
1644 struct xpc_notify_mq_msg_uv *msg;
1645 enum xp_retval ret;
1646
1647 msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1648
1649 /* return an ACK to the sender of this message */
1650
1651 msg->hdr.partid = xp_partition_id;
1652 msg->hdr.size = 0; /* size of zero indicates this is an ACK */
1653
1654 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1655 sizeof(struct xpc_notify_mq_msghdr_uv));
1656 if (ret != xpSuccess)
1657 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1658 }
1659
1660 static struct xpc_arch_operations xpc_arch_ops_uv = {
1661 .setup_partitions = xpc_setup_partitions_uv,
1662 .teardown_partitions = xpc_teardown_partitions_uv,
1663 .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1664 .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1665 .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1666
1667 .allow_hb = xpc_allow_hb_uv,
1668 .disallow_hb = xpc_disallow_hb_uv,
1669 .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1670 .increment_heartbeat = xpc_increment_heartbeat_uv,
1671 .offline_heartbeat = xpc_offline_heartbeat_uv,
1672 .online_heartbeat = xpc_online_heartbeat_uv,
1673 .heartbeat_init = xpc_heartbeat_init_uv,
1674 .heartbeat_exit = xpc_heartbeat_exit_uv,
1675 .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1676
1677 .request_partition_activation =
1678 xpc_request_partition_activation_uv,
1679 .request_partition_reactivation =
1680 xpc_request_partition_reactivation_uv,
1681 .request_partition_deactivation =
1682 xpc_request_partition_deactivation_uv,
1683 .cancel_partition_deactivation_request =
1684 xpc_cancel_partition_deactivation_request_uv,
1685
1686 .setup_ch_structures = xpc_setup_ch_structures_uv,
1687 .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1688
1689 .make_first_contact = xpc_make_first_contact_uv,
1690
1691 .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1692 .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1693 .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1694 .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1695 .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1696 .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1697 .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1698
1699 .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1700
1701 .setup_msg_structures = xpc_setup_msg_structures_uv,
1702 .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1703
1704 .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1705 .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1706 .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1707 .partition_engaged = xpc_partition_engaged_uv,
1708 .any_partition_engaged = xpc_any_partition_engaged_uv,
1709
1710 .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1711 .send_payload = xpc_send_payload_uv,
1712 .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1713 .received_payload = xpc_received_payload_uv,
1714 .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1715 };
1716
1717 int
1718 xpc_init_uv(void)
1719 {
1720 xpc_arch_ops = xpc_arch_ops_uv;
1721
1722 if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1723 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1724 XPC_MSG_HDR_MAX_SIZE);
1725 return -E2BIG;
1726 }
1727
1728 xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0,
1729 XPC_ACTIVATE_IRQ_NAME,
1730 xpc_handle_activate_IRQ_uv);
1731 if (IS_ERR(xpc_activate_mq_uv))
1732 return PTR_ERR(xpc_activate_mq_uv);
1733
1734 xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0,
1735 XPC_NOTIFY_IRQ_NAME,
1736 xpc_handle_notify_IRQ_uv);
1737 if (IS_ERR(xpc_notify_mq_uv)) {
1738 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1739 return PTR_ERR(xpc_notify_mq_uv);
1740 }
1741
1742 return 0;
1743 }
1744
1745 void
1746 xpc_exit_uv(void)
1747 {
1748 xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1749 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1750 }
Linux with added FPC-III support