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sparc: sys32.S incorrect compat-layer splice() system call
[linux-2.6/mini2440.git] / drivers / misc / sgi-xp / xpc_uv.c
blob9172fcdee4e2f468e7780c965d8ffbf257cb75d8
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 2008-2009 Silicon Graphics, Inc. All Rights Reserved.
7 */
8
9 /*
10 * Cross Partition Communication (XPC) uv-based functions.
11 *
12 * Architecture specific implementation of common functions.
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/mm.h>
18 #include <linux/interrupt.h>
19 #include <linux/delay.h>
20 #include <linux/device.h>
21 #include <linux/err.h>
22 #include <asm/uv/uv_hub.h>
23 #if defined CONFIG_X86_64
24 #include <asm/uv/bios.h>
25 #include <asm/uv/uv_irq.h>
26 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
27 #include <asm/sn/intr.h>
28 #include <asm/sn/sn_sal.h>
29 #endif
30 #include "../sgi-gru/gru.h"
31 #include "../sgi-gru/grukservices.h"
32 #include "xpc.h"
33
34 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
35 struct uv_IO_APIC_route_entry {
36 __u64 vector : 8,
37 delivery_mode : 3,
38 dest_mode : 1,
39 delivery_status : 1,
40 polarity : 1,
41 __reserved_1 : 1,
42 trigger : 1,
43 mask : 1,
44 __reserved_2 : 15,
45 dest : 32;
46 };
47 #endif
48
49 static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
50
51 #define XPC_ACTIVATE_MSG_SIZE_UV (1 * GRU_CACHE_LINE_BYTES)
52 #define XPC_ACTIVATE_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
53 XPC_ACTIVATE_MSG_SIZE_UV)
54 #define XPC_ACTIVATE_IRQ_NAME "xpc_activate"
55
56 #define XPC_NOTIFY_MSG_SIZE_UV (2 * GRU_CACHE_LINE_BYTES)
57 #define XPC_NOTIFY_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \
58 XPC_NOTIFY_MSG_SIZE_UV)
59 #define XPC_NOTIFY_IRQ_NAME "xpc_notify"
60
61 static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
62 static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
63
64 static int
65 xpc_setup_partitions_uv(void)
66 {
67 short partid;
68 struct xpc_partition_uv *part_uv;
69
70 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
71 part_uv = &xpc_partitions[partid].sn.uv;
72
73 mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
74 spin_lock_init(&part_uv->flags_lock);
75 part_uv->remote_act_state = XPC_P_AS_INACTIVE;
76 }
77 return 0;
78 }
79
80 static void
81 xpc_teardown_partitions_uv(void)
82 {
83 short partid;
84 struct xpc_partition_uv *part_uv;
85 unsigned long irq_flags;
86
87 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
88 part_uv = &xpc_partitions[partid].sn.uv;
89
90 if (part_uv->cached_activate_gru_mq_desc != NULL) {
91 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
92 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
93 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
94 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
95 kfree(part_uv->cached_activate_gru_mq_desc);
96 part_uv->cached_activate_gru_mq_desc = NULL;
97 mutex_unlock(&part_uv->
98 cached_activate_gru_mq_desc_mutex);
99 }
100 }
101 }
102
103 static int
104 xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
105 {
106 int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
107
108 #if defined CONFIG_X86_64
109 mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset);
110 if (mq->irq < 0) {
111 dev_err(xpc_part, "uv_setup_irq() returned error=%d\n",
112 -mq->irq);
113 return mq->irq;
114 }
115
116 mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
117
118 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
119 if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
120 mq->irq = SGI_XPC_ACTIVATE;
121 else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
122 mq->irq = SGI_XPC_NOTIFY;
123 else
124 return -EINVAL;
125
126 mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
127 uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
128 #else
129 #error not a supported configuration
130 #endif
131
132 return 0;
133 }
134
135 static void
136 xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
137 {
138 #if defined CONFIG_X86_64
139 uv_teardown_irq(mq->irq, mq->mmr_blade, mq->mmr_offset);
140
141 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
142 int mmr_pnode;
143 unsigned long mmr_value;
144
145 mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
146 mmr_value = 1UL << 16;
147
148 uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
149 #else
150 #error not a supported configuration
151 #endif
152 }
153
154 static int
155 xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
156 {
157 int ret;
158
159 #if defined CONFIG_X86_64
160 ret = uv_bios_mq_watchlist_alloc(mq->mmr_blade, uv_gpa(mq->address),
161 mq->order, &mq->mmr_offset);
162 if (ret < 0) {
163 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
164 "ret=%d\n", ret);
165 return ret;
166 }
167 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
168 ret = sn_mq_watchlist_alloc(mq->mmr_blade, (void *)uv_gpa(mq->address),
169 mq->order, &mq->mmr_offset);
170 if (ret < 0) {
171 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
172 ret);
173 return -EBUSY;
174 }
175 #else
176 #error not a supported configuration
177 #endif
178
179 mq->watchlist_num = ret;
180 return 0;
181 }
182
183 static void
184 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
185 {
186 int ret;
187
188 #if defined CONFIG_X86_64
189 ret = uv_bios_mq_watchlist_free(mq->mmr_blade, mq->watchlist_num);
190 BUG_ON(ret != BIOS_STATUS_SUCCESS);
191 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
192 ret = sn_mq_watchlist_free(mq->mmr_blade, mq->watchlist_num);
193 BUG_ON(ret != SALRET_OK);
194 #else
195 #error not a supported configuration
196 #endif
197 }
198
199 static struct xpc_gru_mq_uv *
200 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
201 irq_handler_t irq_handler)
202 {
203 enum xp_retval xp_ret;
204 int ret;
205 int nid;
206 int pg_order;
207 struct page *page;
208 struct xpc_gru_mq_uv *mq;
209 struct uv_IO_APIC_route_entry *mmr_value;
210
211 mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
212 if (mq == NULL) {
213 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
214 "a xpc_gru_mq_uv structure\n");
215 ret = -ENOMEM;
216 goto out_0;
217 }
218
219 mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
220 GFP_KERNEL);
221 if (mq->gru_mq_desc == NULL) {
222 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
223 "a gru_message_queue_desc structure\n");
224 ret = -ENOMEM;
225 goto out_1;
226 }
227
228 pg_order = get_order(mq_size);
229 mq->order = pg_order + PAGE_SHIFT;
230 mq_size = 1UL << mq->order;
231
232 mq->mmr_blade = uv_cpu_to_blade_id(cpu);
233
234 nid = cpu_to_node(cpu);
235 page = alloc_pages_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
236 pg_order);
237 if (page == NULL) {
238 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
239 "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
240 ret = -ENOMEM;
241 goto out_2;
242 }
243 mq->address = page_address(page);
244
245 /* enable generation of irq when GRU mq operation occurs to this mq */
246 ret = xpc_gru_mq_watchlist_alloc_uv(mq);
247 if (ret != 0)
248 goto out_3;
249
250 ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
251 if (ret != 0)
252 goto out_4;
253
254 ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
255 if (ret != 0) {
256 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
257 mq->irq, -ret);
258 goto out_5;
259 }
260
261 mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
262 ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
263 nid, mmr_value->vector, mmr_value->dest);
264 if (ret != 0) {
265 dev_err(xpc_part, "gru_create_message_queue() returned "
266 "error=%d\n", ret);
267 ret = -EINVAL;
268 goto out_6;
269 }
270
271 /* allow other partitions to access this GRU mq */
272 xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
273 if (xp_ret != xpSuccess) {
274 ret = -EACCES;
275 goto out_6;
276 }
277
278 return mq;
279
280 /* something went wrong */
281 out_6:
282 free_irq(mq->irq, NULL);
283 out_5:
284 xpc_release_gru_mq_irq_uv(mq);
285 out_4:
286 xpc_gru_mq_watchlist_free_uv(mq);
287 out_3:
288 free_pages((unsigned long)mq->address, pg_order);
289 out_2:
290 kfree(mq->gru_mq_desc);
291 out_1:
292 kfree(mq);
293 out_0:
294 return ERR_PTR(ret);
295 }
296
297 static void
298 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
299 {
300 unsigned int mq_size;
301 int pg_order;
302 int ret;
303
304 /* disallow other partitions to access GRU mq */
305 mq_size = 1UL << mq->order;
306 ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
307 BUG_ON(ret != xpSuccess);
308
309 /* unregister irq handler and release mq irq/vector mapping */
310 free_irq(mq->irq, NULL);
311 xpc_release_gru_mq_irq_uv(mq);
312
313 /* disable generation of irq when GRU mq op occurs to this mq */
314 xpc_gru_mq_watchlist_free_uv(mq);
315
316 pg_order = mq->order - PAGE_SHIFT;
317 free_pages((unsigned long)mq->address, pg_order);
318
319 kfree(mq);
320 }
321
322 static enum xp_retval
323 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
324 size_t msg_size)
325 {
326 enum xp_retval xp_ret;
327 int ret;
328
329 while (1) {
330 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
331 if (ret == MQE_OK) {
332 xp_ret = xpSuccess;
333 break;
334 }
335
336 if (ret == MQE_QUEUE_FULL) {
337 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
338 "error=MQE_QUEUE_FULL\n");
339 /* !!! handle QLimit reached; delay & try again */
340 /* ??? Do we add a limit to the number of retries? */
341 (void)msleep_interruptible(10);
342 } else if (ret == MQE_CONGESTION) {
343 dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
344 "error=MQE_CONGESTION\n");
345 /* !!! handle LB Overflow; simply try again */
346 /* ??? Do we add a limit to the number of retries? */
347 } else {
348 /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
349 dev_err(xpc_chan, "gru_send_message_gpa() returned "
350 "error=%d\n", ret);
351 xp_ret = xpGruSendMqError;
352 break;
353 }
354 }
355 return xp_ret;
356 }
357
358 static void
359 xpc_process_activate_IRQ_rcvd_uv(void)
360 {
361 unsigned long irq_flags;
362 short partid;
363 struct xpc_partition *part;
364 u8 act_state_req;
365
366 DBUG_ON(xpc_activate_IRQ_rcvd == 0);
367
368 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
369 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
370 part = &xpc_partitions[partid];
371
372 if (part->sn.uv.act_state_req == 0)
373 continue;
374
375 xpc_activate_IRQ_rcvd--;
376 BUG_ON(xpc_activate_IRQ_rcvd < 0);
377
378 act_state_req = part->sn.uv.act_state_req;
379 part->sn.uv.act_state_req = 0;
380 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
381
382 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
383 if (part->act_state == XPC_P_AS_INACTIVE)
384 xpc_activate_partition(part);
385 else if (part->act_state == XPC_P_AS_DEACTIVATING)
386 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
387
388 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
389 if (part->act_state == XPC_P_AS_INACTIVE)
390 xpc_activate_partition(part);
391 else
392 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
393
394 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
395 XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
396
397 } else {
398 BUG();
399 }
400
401 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
402 if (xpc_activate_IRQ_rcvd == 0)
403 break;
404 }
405 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
406
407 }
408
409 static void
410 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
411 struct xpc_activate_mq_msghdr_uv *msg_hdr,
412 int *wakeup_hb_checker)
413 {
414 unsigned long irq_flags;
415 struct xpc_partition_uv *part_uv = &part->sn.uv;
416 struct xpc_openclose_args *args;
417
418 part_uv->remote_act_state = msg_hdr->act_state;
419
420 switch (msg_hdr->type) {
421 case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
422 /* syncing of remote_act_state was just done above */
423 break;
424
425 case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
426 struct xpc_activate_mq_msg_activate_req_uv *msg;
427
428 /*
429 * ??? Do we deal here with ts_jiffies being different
430 * ??? if act_state != XPC_P_AS_INACTIVE instead of
431 * ??? below?
432 */
433 msg = container_of(msg_hdr, struct
434 xpc_activate_mq_msg_activate_req_uv, hdr);
435
436 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
437 if (part_uv->act_state_req == 0)
438 xpc_activate_IRQ_rcvd++;
439 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
440 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
441 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
442 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
443
444 if (msg->activate_gru_mq_desc_gpa !=
445 part_uv->activate_gru_mq_desc_gpa) {
446 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
447 part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
448 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
449 part_uv->activate_gru_mq_desc_gpa =
450 msg->activate_gru_mq_desc_gpa;
451 }
452 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
453
454 (*wakeup_hb_checker)++;
455 break;
456 }
457 case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
458 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
459
460 msg = container_of(msg_hdr, struct
461 xpc_activate_mq_msg_deactivate_req_uv, hdr);
462
463 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
464 if (part_uv->act_state_req == 0)
465 xpc_activate_IRQ_rcvd++;
466 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
467 part_uv->reason = msg->reason;
468 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
469
470 (*wakeup_hb_checker)++;
471 return;
472 }
473 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
474 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
475
476 msg = container_of(msg_hdr, struct
477 xpc_activate_mq_msg_chctl_closerequest_uv,
478 hdr);
479 args = &part->remote_openclose_args[msg->ch_number];
480 args->reason = msg->reason;
481
482 spin_lock_irqsave(&part->chctl_lock, irq_flags);
483 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
484 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
485
486 xpc_wakeup_channel_mgr(part);
487 break;
488 }
489 case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
490 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
491
492 msg = container_of(msg_hdr, struct
493 xpc_activate_mq_msg_chctl_closereply_uv,
494 hdr);
495
496 spin_lock_irqsave(&part->chctl_lock, irq_flags);
497 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
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_OPENREQUEST_UV: {
504 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
505
506 msg = container_of(msg_hdr, struct
507 xpc_activate_mq_msg_chctl_openrequest_uv,
508 hdr);
509 args = &part->remote_openclose_args[msg->ch_number];
510 args->entry_size = msg->entry_size;
511 args->local_nentries = msg->local_nentries;
512
513 spin_lock_irqsave(&part->chctl_lock, irq_flags);
514 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
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_OPENREPLY_UV: {
521 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
522
523 msg = container_of(msg_hdr, struct
524 xpc_activate_mq_msg_chctl_openreply_uv, hdr);
525 args = &part->remote_openclose_args[msg->ch_number];
526 args->remote_nentries = msg->remote_nentries;
527 args->local_nentries = msg->local_nentries;
528 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
529
530 spin_lock_irqsave(&part->chctl_lock, irq_flags);
531 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
532 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
533
534 xpc_wakeup_channel_mgr(part);
535 break;
536 }
537 case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
538 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
539
540 msg = container_of(msg_hdr, struct
541 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
542 spin_lock_irqsave(&part->chctl_lock, irq_flags);
543 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
544 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
545
546 xpc_wakeup_channel_mgr(part);
547 }
548 case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
549 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
550 part_uv->flags |= XPC_P_ENGAGED_UV;
551 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
552 break;
553
554 case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
555 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
556 part_uv->flags &= ~XPC_P_ENGAGED_UV;
557 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
558 break;
559
560 default:
561 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
562 "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
563
564 /* get hb checker to deactivate from the remote partition */
565 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
566 if (part_uv->act_state_req == 0)
567 xpc_activate_IRQ_rcvd++;
568 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
569 part_uv->reason = xpBadMsgType;
570 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
571
572 (*wakeup_hb_checker)++;
573 return;
574 }
575
576 if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
577 part->remote_rp_ts_jiffies != 0) {
578 /*
579 * ??? Does what we do here need to be sensitive to
580 * ??? act_state or remote_act_state?
581 */
582 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
583 if (part_uv->act_state_req == 0)
584 xpc_activate_IRQ_rcvd++;
585 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
586 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
587
588 (*wakeup_hb_checker)++;
589 }
590 }
591
592 static irqreturn_t
593 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
594 {
595 struct xpc_activate_mq_msghdr_uv *msg_hdr;
596 short partid;
597 struct xpc_partition *part;
598 int wakeup_hb_checker = 0;
599 int part_referenced;
600
601 while (1) {
602 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
603 if (msg_hdr == NULL)
604 break;
605
606 partid = msg_hdr->partid;
607 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
608 dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
609 "received invalid partid=0x%x in message\n",
610 partid);
611 } else {
612 part = &xpc_partitions[partid];
613
614 part_referenced = xpc_part_ref(part);
615 xpc_handle_activate_mq_msg_uv(part, msg_hdr,
616 &wakeup_hb_checker);
617 if (part_referenced)
618 xpc_part_deref(part);
619 }
620
621 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
622 }
623
624 if (wakeup_hb_checker)
625 wake_up_interruptible(&xpc_activate_IRQ_wq);
626
627 return IRQ_HANDLED;
628 }
629
630 static enum xp_retval
631 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
632 unsigned long gru_mq_desc_gpa)
633 {
634 enum xp_retval ret;
635
636 ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
637 sizeof(struct gru_message_queue_desc));
638 if (ret == xpSuccess)
639 gru_mq_desc->mq = NULL;
640
641 return ret;
642 }
643
644 static enum xp_retval
645 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
646 int msg_type)
647 {
648 struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
649 struct xpc_partition_uv *part_uv = &part->sn.uv;
650 struct gru_message_queue_desc *gru_mq_desc;
651 unsigned long irq_flags;
652 enum xp_retval ret;
653
654 DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
655
656 msg_hdr->type = msg_type;
657 msg_hdr->partid = xp_partition_id;
658 msg_hdr->act_state = part->act_state;
659 msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
660
661 mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
662 again:
663 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
664 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
665 if (gru_mq_desc == NULL) {
666 gru_mq_desc = kmalloc(sizeof(struct
667 gru_message_queue_desc),
668 GFP_KERNEL);
669 if (gru_mq_desc == NULL) {
670 ret = xpNoMemory;
671 goto done;
672 }
673 part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
674 }
675
676 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
677 part_uv->
678 activate_gru_mq_desc_gpa);
679 if (ret != xpSuccess)
680 goto done;
681
682 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
683 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
684 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
685 }
686
687 /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
688 ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
689 msg_size);
690 if (ret != xpSuccess) {
691 smp_rmb(); /* ensure a fresh copy of part_uv->flags */
692 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
693 goto again;
694 }
695 done:
696 mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
697 return ret;
698 }
699
700 static void
701 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
702 size_t msg_size, int msg_type)
703 {
704 enum xp_retval ret;
705
706 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
707 if (unlikely(ret != xpSuccess))
708 XPC_DEACTIVATE_PARTITION(part, ret);
709 }
710
711 static void
712 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
713 void *msg, size_t msg_size, int msg_type)
714 {
715 struct xpc_partition *part = &xpc_partitions[ch->partid];
716 enum xp_retval ret;
717
718 ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
719 if (unlikely(ret != xpSuccess)) {
720 if (irq_flags != NULL)
721 spin_unlock_irqrestore(&ch->lock, *irq_flags);
722
723 XPC_DEACTIVATE_PARTITION(part, ret);
724
725 if (irq_flags != NULL)
726 spin_lock_irqsave(&ch->lock, *irq_flags);
727 }
728 }
729
730 static void
731 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
732 {
733 unsigned long irq_flags;
734 struct xpc_partition_uv *part_uv = &part->sn.uv;
735
736 /*
737 * !!! Make our side think that the remote partition sent an activate
738 * !!! mq message our way by doing what the activate IRQ handler would
739 * !!! do had one really been sent.
740 */
741
742 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
743 if (part_uv->act_state_req == 0)
744 xpc_activate_IRQ_rcvd++;
745 part_uv->act_state_req = act_state_req;
746 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
747
748 wake_up_interruptible(&xpc_activate_IRQ_wq);
749 }
750
751 static enum xp_retval
752 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
753 size_t *len)
754 {
755 s64 status;
756 enum xp_retval ret;
757
758 #if defined CONFIG_X86_64
759 status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
760 (u64 *)len);
761 if (status == BIOS_STATUS_SUCCESS)
762 ret = xpSuccess;
763 else if (status == BIOS_STATUS_MORE_PASSES)
764 ret = xpNeedMoreInfo;
765 else
766 ret = xpBiosError;
767
768 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
769 status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
770 if (status == SALRET_OK)
771 ret = xpSuccess;
772 else if (status == SALRET_MORE_PASSES)
773 ret = xpNeedMoreInfo;
774 else
775 ret = xpSalError;
776
777 #else
778 #error not a supported configuration
779 #endif
780
781 return ret;
782 }
783
784 static int
785 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
786 {
787 xpc_heartbeat_uv =
788 &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
789 rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
790 rp->sn.uv.activate_gru_mq_desc_gpa =
791 uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
792 return 0;
793 }
794
795 static void
796 xpc_allow_hb_uv(short partid)
797 {
798 }
799
800 static void
801 xpc_disallow_hb_uv(short partid)
802 {
803 }
804
805 static void
806 xpc_disallow_all_hbs_uv(void)
807 {
808 }
809
810 static void
811 xpc_increment_heartbeat_uv(void)
812 {
813 xpc_heartbeat_uv->value++;
814 }
815
816 static void
817 xpc_offline_heartbeat_uv(void)
818 {
819 xpc_increment_heartbeat_uv();
820 xpc_heartbeat_uv->offline = 1;
821 }
822
823 static void
824 xpc_online_heartbeat_uv(void)
825 {
826 xpc_increment_heartbeat_uv();
827 xpc_heartbeat_uv->offline = 0;
828 }
829
830 static void
831 xpc_heartbeat_init_uv(void)
832 {
833 xpc_heartbeat_uv->value = 1;
834 xpc_heartbeat_uv->offline = 0;
835 }
836
837 static void
838 xpc_heartbeat_exit_uv(void)
839 {
840 xpc_offline_heartbeat_uv();
841 }
842
843 static enum xp_retval
844 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
845 {
846 struct xpc_partition_uv *part_uv = &part->sn.uv;
847 enum xp_retval ret;
848
849 ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
850 part_uv->heartbeat_gpa,
851 sizeof(struct xpc_heartbeat_uv));
852 if (ret != xpSuccess)
853 return ret;
854
855 if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
856 !part_uv->cached_heartbeat.offline) {
857
858 ret = xpNoHeartbeat;
859 } else {
860 part->last_heartbeat = part_uv->cached_heartbeat.value;
861 }
862 return ret;
863 }
864
865 static void
866 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
867 unsigned long remote_rp_gpa, int nasid)
868 {
869 short partid = remote_rp->SAL_partid;
870 struct xpc_partition *part = &xpc_partitions[partid];
871 struct xpc_activate_mq_msg_activate_req_uv msg;
872
873 part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
874 part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
875 part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
876 part->sn.uv.activate_gru_mq_desc_gpa =
877 remote_rp->sn.uv.activate_gru_mq_desc_gpa;
878
879 /*
880 * ??? Is it a good idea to make this conditional on what is
881 * ??? potentially stale state information?
882 */
883 if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
884 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
885 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
886 msg.activate_gru_mq_desc_gpa =
887 xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
888 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
889 XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
890 }
891
892 if (part->act_state == XPC_P_AS_INACTIVE)
893 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
894 }
895
896 static void
897 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
898 {
899 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
900 }
901
902 static void
903 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
904 {
905 struct xpc_activate_mq_msg_deactivate_req_uv msg;
906
907 /*
908 * ??? Is it a good idea to make this conditional on what is
909 * ??? potentially stale state information?
910 */
911 if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
912 part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
913
914 msg.reason = part->reason;
915 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
916 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
917 }
918 }
919
920 static void
921 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
922 {
923 /* nothing needs to be done */
924 return;
925 }
926
927 static void
928 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
929 {
930 head->first = NULL;
931 head->last = NULL;
932 spin_lock_init(&head->lock);
933 head->n_entries = 0;
934 }
935
936 static void *
937 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
938 {
939 unsigned long irq_flags;
940 struct xpc_fifo_entry_uv *first;
941
942 spin_lock_irqsave(&head->lock, irq_flags);
943 first = head->first;
944 if (head->first != NULL) {
945 head->first = first->next;
946 if (head->first == NULL)
947 head->last = NULL;
948 }
949 head->n_entries--;
950 BUG_ON(head->n_entries < 0);
951 spin_unlock_irqrestore(&head->lock, irq_flags);
952 first->next = NULL;
953 return first;
954 }
955
956 static void
957 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
958 struct xpc_fifo_entry_uv *last)
959 {
960 unsigned long irq_flags;
961
962 last->next = NULL;
963 spin_lock_irqsave(&head->lock, irq_flags);
964 if (head->last != NULL)
965 head->last->next = last;
966 else
967 head->first = last;
968 head->last = last;
969 head->n_entries++;
970 spin_unlock_irqrestore(&head->lock, irq_flags);
971 }
972
973 static int
974 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
975 {
976 return head->n_entries;
977 }
978
979 /*
980 * Setup the channel structures that are uv specific.
981 */
982 static enum xp_retval
983 xpc_setup_ch_structures_uv(struct xpc_partition *part)
984 {
985 struct xpc_channel_uv *ch_uv;
986 int ch_number;
987
988 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
989 ch_uv = &part->channels[ch_number].sn.uv;
990
991 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
992 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
993 }
994
995 return xpSuccess;
996 }
997
998 /*
999 * Teardown the channel structures that are uv specific.
1000 */
1001 static void
1002 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1003 {
1004 /* nothing needs to be done */
1005 return;
1006 }
1007
1008 static enum xp_retval
1009 xpc_make_first_contact_uv(struct xpc_partition *part)
1010 {
1011 struct xpc_activate_mq_msg_uv msg;
1012
1013 /*
1014 * We send a sync msg to get the remote partition's remote_act_state
1015 * updated to our current act_state which at this point should
1016 * be XPC_P_AS_ACTIVATING.
1017 */
1018 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1019 XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1020
1021 while (part->sn.uv.remote_act_state != XPC_P_AS_ACTIVATING) {
1022
1023 dev_dbg(xpc_part, "waiting to make first contact with "
1024 "partition %d\n", XPC_PARTID(part));
1025
1026 /* wait a 1/4 of a second or so */
1027 (void)msleep_interruptible(250);
1028
1029 if (part->act_state == XPC_P_AS_DEACTIVATING)
1030 return part->reason;
1031 }
1032
1033 return xpSuccess;
1034 }
1035
1036 static u64
1037 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1038 {
1039 unsigned long irq_flags;
1040 union xpc_channel_ctl_flags chctl;
1041
1042 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1043 chctl = part->chctl;
1044 if (chctl.all_flags != 0)
1045 part->chctl.all_flags = 0;
1046
1047 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1048 return chctl.all_flags;
1049 }
1050
1051 static enum xp_retval
1052 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1053 {
1054 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1055 struct xpc_send_msg_slot_uv *msg_slot;
1056 unsigned long irq_flags;
1057 int nentries;
1058 int entry;
1059 size_t nbytes;
1060
1061 for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1062 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1063 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1064 if (ch_uv->send_msg_slots == NULL)
1065 continue;
1066
1067 for (entry = 0; entry < nentries; entry++) {
1068 msg_slot = &ch_uv->send_msg_slots[entry];
1069
1070 msg_slot->msg_slot_number = entry;
1071 xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1072 &msg_slot->next);
1073 }
1074
1075 spin_lock_irqsave(&ch->lock, irq_flags);
1076 if (nentries < ch->local_nentries)
1077 ch->local_nentries = nentries;
1078 spin_unlock_irqrestore(&ch->lock, irq_flags);
1079 return xpSuccess;
1080 }
1081
1082 return xpNoMemory;
1083 }
1084
1085 static enum xp_retval
1086 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1087 {
1088 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1089 struct xpc_notify_mq_msg_uv *msg_slot;
1090 unsigned long irq_flags;
1091 int nentries;
1092 int entry;
1093 size_t nbytes;
1094
1095 for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1096 nbytes = nentries * ch->entry_size;
1097 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1098 if (ch_uv->recv_msg_slots == NULL)
1099 continue;
1100
1101 for (entry = 0; entry < nentries; entry++) {
1102 msg_slot = ch_uv->recv_msg_slots +
1103 entry * ch->entry_size;
1104
1105 msg_slot->hdr.msg_slot_number = entry;
1106 }
1107
1108 spin_lock_irqsave(&ch->lock, irq_flags);
1109 if (nentries < ch->remote_nentries)
1110 ch->remote_nentries = nentries;
1111 spin_unlock_irqrestore(&ch->lock, irq_flags);
1112 return xpSuccess;
1113 }
1114
1115 return xpNoMemory;
1116 }
1117
1118 /*
1119 * Allocate msg_slots associated with the channel.
1120 */
1121 static enum xp_retval
1122 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1123 {
1124 static enum xp_retval ret;
1125 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1126
1127 DBUG_ON(ch->flags & XPC_C_SETUP);
1128
1129 ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1130 gru_message_queue_desc),
1131 GFP_KERNEL);
1132 if (ch_uv->cached_notify_gru_mq_desc == NULL)
1133 return xpNoMemory;
1134
1135 ret = xpc_allocate_send_msg_slot_uv(ch);
1136 if (ret == xpSuccess) {
1137
1138 ret = xpc_allocate_recv_msg_slot_uv(ch);
1139 if (ret != xpSuccess) {
1140 kfree(ch_uv->send_msg_slots);
1141 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1142 }
1143 }
1144 return ret;
1145 }
1146
1147 /*
1148 * Free up msg_slots and clear other stuff that were setup for the specified
1149 * channel.
1150 */
1151 static void
1152 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1153 {
1154 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1155
1156 DBUG_ON(!spin_is_locked(&ch->lock));
1157
1158 kfree(ch_uv->cached_notify_gru_mq_desc);
1159 ch_uv->cached_notify_gru_mq_desc = NULL;
1160
1161 if (ch->flags & XPC_C_SETUP) {
1162 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1163 kfree(ch_uv->send_msg_slots);
1164 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1165 kfree(ch_uv->recv_msg_slots);
1166 }
1167 }
1168
1169 static void
1170 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1171 {
1172 struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1173
1174 msg.ch_number = ch->number;
1175 msg.reason = ch->reason;
1176 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1177 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1178 }
1179
1180 static void
1181 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1182 {
1183 struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1184
1185 msg.ch_number = ch->number;
1186 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1187 XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1188 }
1189
1190 static void
1191 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1192 {
1193 struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1194
1195 msg.ch_number = ch->number;
1196 msg.entry_size = ch->entry_size;
1197 msg.local_nentries = ch->local_nentries;
1198 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1199 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1200 }
1201
1202 static void
1203 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1204 {
1205 struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1206
1207 msg.ch_number = ch->number;
1208 msg.local_nentries = ch->local_nentries;
1209 msg.remote_nentries = ch->remote_nentries;
1210 msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1211 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1212 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1213 }
1214
1215 static void
1216 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1217 {
1218 struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1219
1220 msg.ch_number = ch->number;
1221 xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1222 XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1223 }
1224
1225 static void
1226 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1227 {
1228 unsigned long irq_flags;
1229
1230 spin_lock_irqsave(&part->chctl_lock, irq_flags);
1231 part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1232 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1233
1234 xpc_wakeup_channel_mgr(part);
1235 }
1236
1237 static enum xp_retval
1238 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1239 unsigned long gru_mq_desc_gpa)
1240 {
1241 struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1242
1243 DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1244 return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1245 gru_mq_desc_gpa);
1246 }
1247
1248 static void
1249 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1250 {
1251 struct xpc_activate_mq_msg_uv msg;
1252
1253 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1254 XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1255 }
1256
1257 static void
1258 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1259 {
1260 struct xpc_activate_mq_msg_uv msg;
1261
1262 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1263 XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1264 }
1265
1266 static void
1267 xpc_assume_partition_disengaged_uv(short partid)
1268 {
1269 struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1270 unsigned long irq_flags;
1271
1272 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1273 part_uv->flags &= ~XPC_P_ENGAGED_UV;
1274 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1275 }
1276
1277 static int
1278 xpc_partition_engaged_uv(short partid)
1279 {
1280 return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1281 }
1282
1283 static int
1284 xpc_any_partition_engaged_uv(void)
1285 {
1286 struct xpc_partition_uv *part_uv;
1287 short partid;
1288
1289 for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1290 part_uv = &xpc_partitions[partid].sn.uv;
1291 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1292 return 1;
1293 }
1294 return 0;
1295 }
1296
1297 static enum xp_retval
1298 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1299 struct xpc_send_msg_slot_uv **address_of_msg_slot)
1300 {
1301 enum xp_retval ret;
1302 struct xpc_send_msg_slot_uv *msg_slot;
1303 struct xpc_fifo_entry_uv *entry;
1304
1305 while (1) {
1306 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1307 if (entry != NULL)
1308 break;
1309
1310 if (flags & XPC_NOWAIT)
1311 return xpNoWait;
1312
1313 ret = xpc_allocate_msg_wait(ch);
1314 if (ret != xpInterrupted && ret != xpTimeout)
1315 return ret;
1316 }
1317
1318 msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1319 *address_of_msg_slot = msg_slot;
1320 return xpSuccess;
1321 }
1322
1323 static void
1324 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1325 struct xpc_send_msg_slot_uv *msg_slot)
1326 {
1327 xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1328
1329 /* wakeup anyone waiting for a free msg slot */
1330 if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1331 wake_up(&ch->msg_allocate_wq);
1332 }
1333
1334 static void
1335 xpc_notify_sender_uv(struct xpc_channel *ch,
1336 struct xpc_send_msg_slot_uv *msg_slot,
1337 enum xp_retval reason)
1338 {
1339 xpc_notify_func func = msg_slot->func;
1340
1341 if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1342
1343 atomic_dec(&ch->n_to_notify);
1344
1345 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1346 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1347 msg_slot->msg_slot_number, ch->partid, ch->number);
1348
1349 func(reason, ch->partid, ch->number, msg_slot->key);
1350
1351 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1352 "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1353 msg_slot->msg_slot_number, ch->partid, ch->number);
1354 }
1355 }
1356
1357 static void
1358 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1359 struct xpc_notify_mq_msg_uv *msg)
1360 {
1361 struct xpc_send_msg_slot_uv *msg_slot;
1362 int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1363
1364 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1365
1366 BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1367 msg_slot->msg_slot_number += ch->local_nentries;
1368
1369 if (msg_slot->func != NULL)
1370 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1371
1372 xpc_free_msg_slot_uv(ch, msg_slot);
1373 }
1374
1375 static void
1376 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1377 struct xpc_notify_mq_msg_uv *msg)
1378 {
1379 struct xpc_partition_uv *part_uv = &part->sn.uv;
1380 struct xpc_channel *ch;
1381 struct xpc_channel_uv *ch_uv;
1382 struct xpc_notify_mq_msg_uv *msg_slot;
1383 unsigned long irq_flags;
1384 int ch_number = msg->hdr.ch_number;
1385
1386 if (unlikely(ch_number >= part->nchannels)) {
1387 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1388 "channel number=0x%x in message from partid=%d\n",
1389 ch_number, XPC_PARTID(part));
1390
1391 /* get hb checker to deactivate from the remote partition */
1392 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1393 if (part_uv->act_state_req == 0)
1394 xpc_activate_IRQ_rcvd++;
1395 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1396 part_uv->reason = xpBadChannelNumber;
1397 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1398
1399 wake_up_interruptible(&xpc_activate_IRQ_wq);
1400 return;
1401 }
1402
1403 ch = &part->channels[ch_number];
1404 xpc_msgqueue_ref(ch);
1405
1406 if (!(ch->flags & XPC_C_CONNECTED)) {
1407 xpc_msgqueue_deref(ch);
1408 return;
1409 }
1410
1411 /* see if we're really dealing with an ACK for a previously sent msg */
1412 if (msg->hdr.size == 0) {
1413 xpc_handle_notify_mq_ack_uv(ch, msg);
1414 xpc_msgqueue_deref(ch);
1415 return;
1416 }
1417
1418 /* we're dealing with a normal message sent via the notify_mq */
1419 ch_uv = &ch->sn.uv;
1420
1421 msg_slot = ch_uv->recv_msg_slots +
1422 (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1423
1424 BUG_ON(msg->hdr.msg_slot_number != msg_slot->hdr.msg_slot_number);
1425 BUG_ON(msg_slot->hdr.size != 0);
1426
1427 memcpy(msg_slot, msg, msg->hdr.size);
1428
1429 xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1430
1431 if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1432 /*
1433 * If there is an existing idle kthread get it to deliver
1434 * the payload, otherwise we'll have to get the channel mgr
1435 * for this partition to create a kthread to do the delivery.
1436 */
1437 if (atomic_read(&ch->kthreads_idle) > 0)
1438 wake_up_nr(&ch->idle_wq, 1);
1439 else
1440 xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1441 }
1442 xpc_msgqueue_deref(ch);
1443 }
1444
1445 static irqreturn_t
1446 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1447 {
1448 struct xpc_notify_mq_msg_uv *msg;
1449 short partid;
1450 struct xpc_partition *part;
1451
1452 while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1453 NULL) {
1454
1455 partid = msg->hdr.partid;
1456 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1457 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1458 "invalid partid=0x%x in message\n", partid);
1459 } else {
1460 part = &xpc_partitions[partid];
1461
1462 if (xpc_part_ref(part)) {
1463 xpc_handle_notify_mq_msg_uv(part, msg);
1464 xpc_part_deref(part);
1465 }
1466 }
1467
1468 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1469 }
1470
1471 return IRQ_HANDLED;
1472 }
1473
1474 static int
1475 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1476 {
1477 return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1478 }
1479
1480 static void
1481 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1482 {
1483 struct xpc_channel *ch = &part->channels[ch_number];
1484 int ndeliverable_payloads;
1485
1486 xpc_msgqueue_ref(ch);
1487
1488 ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1489
1490 if (ndeliverable_payloads > 0 &&
1491 (ch->flags & XPC_C_CONNECTED) &&
1492 (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1493
1494 xpc_activate_kthreads(ch, ndeliverable_payloads);
1495 }
1496
1497 xpc_msgqueue_deref(ch);
1498 }
1499
1500 static enum xp_retval
1501 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1502 u16 payload_size, u8 notify_type, xpc_notify_func func,
1503 void *key)
1504 {
1505 enum xp_retval ret = xpSuccess;
1506 struct xpc_send_msg_slot_uv *msg_slot = NULL;
1507 struct xpc_notify_mq_msg_uv *msg;
1508 u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1509 size_t msg_size;
1510
1511 DBUG_ON(notify_type != XPC_N_CALL);
1512
1513 msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1514 if (msg_size > ch->entry_size)
1515 return xpPayloadTooBig;
1516
1517 xpc_msgqueue_ref(ch);
1518
1519 if (ch->flags & XPC_C_DISCONNECTING) {
1520 ret = ch->reason;
1521 goto out_1;
1522 }
1523 if (!(ch->flags & XPC_C_CONNECTED)) {
1524 ret = xpNotConnected;
1525 goto out_1;
1526 }
1527
1528 ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1529 if (ret != xpSuccess)
1530 goto out_1;
1531
1532 if (func != NULL) {
1533 atomic_inc(&ch->n_to_notify);
1534
1535 msg_slot->key = key;
1536 smp_wmb(); /* a non-NULL func must hit memory after the key */
1537 msg_slot->func = func;
1538
1539 if (ch->flags & XPC_C_DISCONNECTING) {
1540 ret = ch->reason;
1541 goto out_2;
1542 }
1543 }
1544
1545 msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1546 msg->hdr.partid = xp_partition_id;
1547 msg->hdr.ch_number = ch->number;
1548 msg->hdr.size = msg_size;
1549 msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1550 memcpy(&msg->payload, payload, payload_size);
1551
1552 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1553 msg_size);
1554 if (ret == xpSuccess)
1555 goto out_1;
1556
1557 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1558 out_2:
1559 if (func != NULL) {
1560 /*
1561 * Try to NULL the msg_slot's func field. If we fail, then
1562 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1563 * case we need to pretend we succeeded to send the message
1564 * since the user will get a callout for the disconnect error
1565 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1566 * error returned here will confuse them. Additionally, since
1567 * in this case the channel is being disconnected we don't need
1568 * to put the the msg_slot back on the free list.
1569 */
1570 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1571 ret = xpSuccess;
1572 goto out_1;
1573 }
1574
1575 msg_slot->key = NULL;
1576 atomic_dec(&ch->n_to_notify);
1577 }
1578 xpc_free_msg_slot_uv(ch, msg_slot);
1579 out_1:
1580 xpc_msgqueue_deref(ch);
1581 return ret;
1582 }
1583
1584 /*
1585 * Tell the callers of xpc_send_notify() that the status of their payloads
1586 * is unknown because the channel is now disconnecting.
1587 *
1588 * We don't worry about putting these msg_slots on the free list since the
1589 * msg_slots themselves are about to be kfree'd.
1590 */
1591 static void
1592 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1593 {
1594 struct xpc_send_msg_slot_uv *msg_slot;
1595 int entry;
1596
1597 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1598
1599 for (entry = 0; entry < ch->local_nentries; entry++) {
1600
1601 if (atomic_read(&ch->n_to_notify) == 0)
1602 break;
1603
1604 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1605 if (msg_slot->func != NULL)
1606 xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1607 }
1608 }
1609
1610 /*
1611 * Get the next deliverable message's payload.
1612 */
1613 static void *
1614 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1615 {
1616 struct xpc_fifo_entry_uv *entry;
1617 struct xpc_notify_mq_msg_uv *msg;
1618 void *payload = NULL;
1619
1620 if (!(ch->flags & XPC_C_DISCONNECTING)) {
1621 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1622 if (entry != NULL) {
1623 msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1624 hdr.u.next);
1625 payload = &msg->payload;
1626 }
1627 }
1628 return payload;
1629 }
1630
1631 static void
1632 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1633 {
1634 struct xpc_notify_mq_msg_uv *msg;
1635 enum xp_retval ret;
1636
1637 msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1638
1639 /* return an ACK to the sender of this message */
1640
1641 msg->hdr.partid = xp_partition_id;
1642 msg->hdr.size = 0; /* size of zero indicates this is an ACK */
1643
1644 ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1645 sizeof(struct xpc_notify_mq_msghdr_uv));
1646 if (ret != xpSuccess)
1647 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1648
1649 msg->hdr.msg_slot_number += ch->remote_nentries;
1650 }
1651
1652 static struct xpc_arch_operations xpc_arch_ops_uv = {
1653 .setup_partitions = xpc_setup_partitions_uv,
1654 .teardown_partitions = xpc_teardown_partitions_uv,
1655 .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1656 .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1657 .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1658
1659 .allow_hb = xpc_allow_hb_uv,
1660 .disallow_hb = xpc_disallow_hb_uv,
1661 .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1662 .increment_heartbeat = xpc_increment_heartbeat_uv,
1663 .offline_heartbeat = xpc_offline_heartbeat_uv,
1664 .online_heartbeat = xpc_online_heartbeat_uv,
1665 .heartbeat_init = xpc_heartbeat_init_uv,
1666 .heartbeat_exit = xpc_heartbeat_exit_uv,
1667 .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1668
1669 .request_partition_activation =
1670 xpc_request_partition_activation_uv,
1671 .request_partition_reactivation =
1672 xpc_request_partition_reactivation_uv,
1673 .request_partition_deactivation =
1674 xpc_request_partition_deactivation_uv,
1675 .cancel_partition_deactivation_request =
1676 xpc_cancel_partition_deactivation_request_uv,
1677
1678 .setup_ch_structures = xpc_setup_ch_structures_uv,
1679 .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1680
1681 .make_first_contact = xpc_make_first_contact_uv,
1682
1683 .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1684 .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1685 .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1686 .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1687 .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1688 .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1689 .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1690
1691 .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1692
1693 .setup_msg_structures = xpc_setup_msg_structures_uv,
1694 .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1695
1696 .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1697 .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1698 .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1699 .partition_engaged = xpc_partition_engaged_uv,
1700 .any_partition_engaged = xpc_any_partition_engaged_uv,
1701
1702 .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1703 .send_payload = xpc_send_payload_uv,
1704 .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1705 .received_payload = xpc_received_payload_uv,
1706 .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1707 };
1708
1709 int
1710 xpc_init_uv(void)
1711 {
1712 xpc_arch_ops = xpc_arch_ops_uv;
1713
1714 if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1715 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1716 XPC_MSG_HDR_MAX_SIZE);
1717 return -E2BIG;
1718 }
1719
1720 xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0,
1721 XPC_ACTIVATE_IRQ_NAME,
1722 xpc_handle_activate_IRQ_uv);
1723 if (IS_ERR(xpc_activate_mq_uv))
1724 return PTR_ERR(xpc_activate_mq_uv);
1725
1726 xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0,
1727 XPC_NOTIFY_IRQ_NAME,
1728 xpc_handle_notify_IRQ_uv);
1729 if (IS_ERR(xpc_notify_mq_uv)) {
1730 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1731 return PTR_ERR(xpc_notify_mq_uv);
1732 }
1733
1734 return 0;
1735 }
1736
1737 void
1738 xpc_exit_uv(void)
1739 {
1740 xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1741 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1742 }
Support for the Chinese Samsung S3C2440 based development boards