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-rw-r--r--drivers/misc/sgi-xp/xpc_partition.c1174
1 files changed, 1174 insertions, 0 deletions
diff --git a/drivers/misc/sgi-xp/xpc_partition.c b/drivers/misc/sgi-xp/xpc_partition.c
new file mode 100644
index 000000000000..27e200ec5826
--- /dev/null
+++ b/drivers/misc/sgi-xp/xpc_partition.c
@@ -0,0 +1,1174 @@
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) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
7 */
8
9/*
10 * Cross Partition Communication (XPC) partition support.
11 *
12 * This is the part of XPC that detects the presence/absence of
13 * other partitions. It provides a heartbeat and monitors the
14 * heartbeats of other partitions.
15 *
16 */
17
18#include <linux/kernel.h>
19#include <linux/sysctl.h>
20#include <linux/cache.h>
21#include <linux/mmzone.h>
22#include <linux/nodemask.h>
23#include <asm/uncached.h>
24#include <asm/sn/bte.h>
25#include <asm/sn/intr.h>
26#include <asm/sn/sn_sal.h>
27#include <asm/sn/nodepda.h>
28#include <asm/sn/addrs.h>
29#include "xpc.h"
30
31/* XPC is exiting flag */
32int xpc_exiting;
33
34/* SH_IPI_ACCESS shub register value on startup */
35static u64 xpc_sh1_IPI_access;
36static u64 xpc_sh2_IPI_access0;
37static u64 xpc_sh2_IPI_access1;
38static u64 xpc_sh2_IPI_access2;
39static u64 xpc_sh2_IPI_access3;
40
41/* original protection values for each node */
42u64 xpc_prot_vec[MAX_NUMNODES];
43
44/* this partition's reserved page pointers */
45struct xpc_rsvd_page *xpc_rsvd_page;
46static u64 *xpc_part_nasids;
47static u64 *xpc_mach_nasids;
48struct xpc_vars *xpc_vars;
49struct xpc_vars_part *xpc_vars_part;
50
51static int xp_nasid_mask_bytes; /* actual size in bytes of nasid mask */
52static int xp_nasid_mask_words; /* actual size in words of nasid mask */
53
54/*
55 * For performance reasons, each entry of xpc_partitions[] is cacheline
56 * aligned. And xpc_partitions[] is padded with an additional entry at the
57 * end so that the last legitimate entry doesn't share its cacheline with
58 * another variable.
59 */
60struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
61
62/*
63 * Generic buffer used to store a local copy of portions of a remote
64 * partition's reserved page (either its header and part_nasids mask,
65 * or its vars).
66 */
67char *xpc_remote_copy_buffer;
68void *xpc_remote_copy_buffer_base;
69
70/*
71 * Guarantee that the kmalloc'd memory is cacheline aligned.
72 */
73void *
74xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
75{
76 /* see if kmalloc will give us cachline aligned memory by default */
77 *base = kmalloc(size, flags);
78 if (*base == NULL)
79 return NULL;
80
81 if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
82 return *base;
83
84 kfree(*base);
85
86 /* nope, we'll have to do it ourselves */
87 *base = kmalloc(size + L1_CACHE_BYTES, flags);
88 if (*base == NULL)
89 return NULL;
90
91 return (void *)L1_CACHE_ALIGN((u64)*base);
92}
93
94/*
95 * Given a nasid, get the physical address of the partition's reserved page
96 * for that nasid. This function returns 0 on any error.
97 */
98static u64
99xpc_get_rsvd_page_pa(int nasid)
100{
101 bte_result_t bte_res;
102 s64 status;
103 u64 cookie = 0;
104 u64 rp_pa = nasid; /* seed with nasid */
105 u64 len = 0;
106 u64 buf = buf;
107 u64 buf_len = 0;
108 void *buf_base = NULL;
109
110 while (1) {
111
112 status = sn_partition_reserved_page_pa(buf, &cookie, &rp_pa,
113 &len);
114
115 dev_dbg(xpc_part, "SAL returned with status=%li, cookie="
116 "0x%016lx, address=0x%016lx, len=0x%016lx\n",
117 status, cookie, rp_pa, len);
118
119 if (status != SALRET_MORE_PASSES)
120 break;
121
122 if (L1_CACHE_ALIGN(len) > buf_len) {
123 kfree(buf_base);
124 buf_len = L1_CACHE_ALIGN(len);
125 buf = (u64)xpc_kmalloc_cacheline_aligned(buf_len,
126 GFP_KERNEL,
127 &buf_base);
128 if (buf_base == NULL) {
129 dev_err(xpc_part, "unable to kmalloc "
130 "len=0x%016lx\n", buf_len);
131 status = SALRET_ERROR;
132 break;
133 }
134 }
135
136 bte_res = xp_bte_copy(rp_pa, buf, buf_len,
137 (BTE_NOTIFY | BTE_WACQUIRE), NULL);
138 if (bte_res != BTE_SUCCESS) {
139 dev_dbg(xpc_part, "xp_bte_copy failed %i\n", bte_res);
140 status = SALRET_ERROR;
141 break;
142 }
143 }
144
145 kfree(buf_base);
146
147 if (status != SALRET_OK)
148 rp_pa = 0;
149
150 dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa);
151 return rp_pa;
152}
153
154/*
155 * Fill the partition reserved page with the information needed by
156 * other partitions to discover we are alive and establish initial
157 * communications.
158 */
159struct xpc_rsvd_page *
160xpc_rsvd_page_init(void)
161{
162 struct xpc_rsvd_page *rp;
163 AMO_t *amos_page;
164 u64 rp_pa, nasid_array = 0;
165 int i, ret;
166
167 /* get the local reserved page's address */
168
169 preempt_disable();
170 rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id()));
171 preempt_enable();
172 if (rp_pa == 0) {
173 dev_err(xpc_part, "SAL failed to locate the reserved page\n");
174 return NULL;
175 }
176 rp = (struct xpc_rsvd_page *)__va(rp_pa);
177
178 if (rp->partid != sn_partition_id) {
179 dev_err(xpc_part, "the reserved page's partid of %d should be "
180 "%d\n", rp->partid, sn_partition_id);
181 return NULL;
182 }
183
184 rp->version = XPC_RP_VERSION;
185
186 /* establish the actual sizes of the nasid masks */
187 if (rp->SAL_version == 1) {
188 /* SAL_version 1 didn't set the nasids_size field */
189 rp->nasids_size = 128;
190 }
191 xp_nasid_mask_bytes = rp->nasids_size;
192 xp_nasid_mask_words = xp_nasid_mask_bytes / 8;
193
194 /* setup the pointers to the various items in the reserved page */
195 xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
196 xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
197 xpc_vars = XPC_RP_VARS(rp);
198 xpc_vars_part = XPC_RP_VARS_PART(rp);
199
200 /*
201 * Before clearing xpc_vars, see if a page of AMOs had been previously
202 * allocated. If not we'll need to allocate one and set permissions
203 * so that cross-partition AMOs are allowed.
204 *
205 * The allocated AMO page needs MCA reporting to remain disabled after
206 * XPC has unloaded. To make this work, we keep a copy of the pointer
207 * to this page (i.e., amos_page) in the struct xpc_vars structure,
208 * which is pointed to by the reserved page, and re-use that saved copy
209 * on subsequent loads of XPC. This AMO page is never freed, and its
210 * memory protections are never restricted.
211 */
212 amos_page = xpc_vars->amos_page;
213 if (amos_page == NULL) {
214 amos_page = (AMO_t *)TO_AMO(uncached_alloc_page(0));
215 if (amos_page == NULL) {
216 dev_err(xpc_part, "can't allocate page of AMOs\n");
217 return NULL;
218 }
219
220 /*
221 * Open up AMO-R/W to cpu. This is done for Shub 1.1 systems
222 * when xpc_allow_IPI_ops() is called via xpc_hb_init().
223 */
224 if (!enable_shub_wars_1_1()) {
225 ret = sn_change_memprotect(ia64_tpa((u64)amos_page),
226 PAGE_SIZE,
227 SN_MEMPROT_ACCESS_CLASS_1,
228 &nasid_array);
229 if (ret != 0) {
230 dev_err(xpc_part, "can't change memory "
231 "protections\n");
232 uncached_free_page(__IA64_UNCACHED_OFFSET |
233 TO_PHYS((u64)amos_page));
234 return NULL;
235 }
236 }
237 } else if (!IS_AMO_ADDRESS((u64)amos_page)) {
238 /*
239 * EFI's XPBOOT can also set amos_page in the reserved page,
240 * but it happens to leave it as an uncached physical address
241 * and we need it to be an uncached virtual, so we'll have to
242 * convert it.
243 */
244 if (!IS_AMO_PHYS_ADDRESS((u64)amos_page)) {
245 dev_err(xpc_part, "previously used amos_page address "
246 "is bad = 0x%p\n", (void *)amos_page);
247 return NULL;
248 }
249 amos_page = (AMO_t *)TO_AMO((u64)amos_page);
250 }
251
252 /* clear xpc_vars */
253 memset(xpc_vars, 0, sizeof(struct xpc_vars));
254
255 xpc_vars->version = XPC_V_VERSION;
256 xpc_vars->act_nasid = cpuid_to_nasid(0);
257 xpc_vars->act_phys_cpuid = cpu_physical_id(0);
258 xpc_vars->vars_part_pa = __pa(xpc_vars_part);
259 xpc_vars->amos_page_pa = ia64_tpa((u64)amos_page);
260 xpc_vars->amos_page = amos_page; /* save for next load of XPC */
261
262 /* clear xpc_vars_part */
263 memset((u64 *)xpc_vars_part, 0, sizeof(struct xpc_vars_part) *
264 XP_MAX_PARTITIONS);
265
266 /* initialize the activate IRQ related AMO variables */
267 for (i = 0; i < xp_nasid_mask_words; i++)
268 (void)xpc_IPI_init(XPC_ACTIVATE_IRQ_AMOS + i);
269
270 /* initialize the engaged remote partitions related AMO variables */
271 (void)xpc_IPI_init(XPC_ENGAGED_PARTITIONS_AMO);
272 (void)xpc_IPI_init(XPC_DISENGAGE_REQUEST_AMO);
273
274 /* timestamp of when reserved page was setup by XPC */
275 rp->stamp = CURRENT_TIME;
276
277 /*
278 * This signifies to the remote partition that our reserved
279 * page is initialized.
280 */
281 rp->vars_pa = __pa(xpc_vars);
282
283 return rp;
284}
285
286/*
287 * Change protections to allow IPI operations (and AMO operations on
288 * Shub 1.1 systems).
289 */
290void
291xpc_allow_IPI_ops(void)
292{
293 int node;
294 int nasid;
295
296 /* >>> Change SH_IPI_ACCESS code to use SAL call once it is available */
297
298 if (is_shub2()) {
299 xpc_sh2_IPI_access0 =
300 (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS0));
301 xpc_sh2_IPI_access1 =
302 (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS1));
303 xpc_sh2_IPI_access2 =
304 (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS2));
305 xpc_sh2_IPI_access3 =
306 (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS3));
307
308 for_each_online_node(node) {
309 nasid = cnodeid_to_nasid(node);
310 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
311 -1UL);
312 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
313 -1UL);
314 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
315 -1UL);
316 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
317 -1UL);
318 }
319
320 } else {
321 xpc_sh1_IPI_access =
322 (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH1_IPI_ACCESS));
323
324 for_each_online_node(node) {
325 nasid = cnodeid_to_nasid(node);
326 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
327 -1UL);
328
329 /*
330 * Since the BIST collides with memory operations on
331 * SHUB 1.1 sn_change_memprotect() cannot be used.
332 */
333 if (enable_shub_wars_1_1()) {
334 /* open up everything */
335 xpc_prot_vec[node] = (u64)HUB_L((u64 *)
336 GLOBAL_MMR_ADDR
337 (nasid,
338 SH1_MD_DQLP_MMR_DIR_PRIVEC0));
339 HUB_S((u64 *)
340 GLOBAL_MMR_ADDR(nasid,
341 SH1_MD_DQLP_MMR_DIR_PRIVEC0),
342 -1UL);
343 HUB_S((u64 *)
344 GLOBAL_MMR_ADDR(nasid,
345 SH1_MD_DQRP_MMR_DIR_PRIVEC0),
346 -1UL);
347 }
348 }
349 }
350}
351
352/*
353 * Restrict protections to disallow IPI operations (and AMO operations on
354 * Shub 1.1 systems).
355 */
356void
357xpc_restrict_IPI_ops(void)
358{
359 int node;
360 int nasid;
361
362 /* >>> Change SH_IPI_ACCESS code to use SAL call once it is available */
363
364 if (is_shub2()) {
365
366 for_each_online_node(node) {
367 nasid = cnodeid_to_nasid(node);
368 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
369 xpc_sh2_IPI_access0);
370 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
371 xpc_sh2_IPI_access1);
372 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
373 xpc_sh2_IPI_access2);
374 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
375 xpc_sh2_IPI_access3);
376 }
377
378 } else {
379
380 for_each_online_node(node) {
381 nasid = cnodeid_to_nasid(node);
382 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
383 xpc_sh1_IPI_access);
384
385 if (enable_shub_wars_1_1()) {
386 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid,
387 SH1_MD_DQLP_MMR_DIR_PRIVEC0),
388 xpc_prot_vec[node]);
389 HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid,
390 SH1_MD_DQRP_MMR_DIR_PRIVEC0),
391 xpc_prot_vec[node]);
392 }
393 }
394 }
395}
396
397/*
398 * At periodic intervals, scan through all active partitions and ensure
399 * their heartbeat is still active. If not, the partition is deactivated.
400 */
401void
402xpc_check_remote_hb(void)
403{
404 struct xpc_vars *remote_vars;
405 struct xpc_partition *part;
406 partid_t partid;
407 bte_result_t bres;
408
409 remote_vars = (struct xpc_vars *)xpc_remote_copy_buffer;
410
411 for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
412
413 if (xpc_exiting)
414 break;
415
416 if (partid == sn_partition_id)
417 continue;
418
419 part = &xpc_partitions[partid];
420
421 if (part->act_state == XPC_P_INACTIVE ||
422 part->act_state == XPC_P_DEACTIVATING) {
423 continue;
424 }
425
426 /* pull the remote_hb cache line */
427 bres = xp_bte_copy(part->remote_vars_pa,
428 (u64)remote_vars,
429 XPC_RP_VARS_SIZE,
430 (BTE_NOTIFY | BTE_WACQUIRE), NULL);
431 if (bres != BTE_SUCCESS) {
432 XPC_DEACTIVATE_PARTITION(part,
433 xpc_map_bte_errors(bres));
434 continue;
435 }
436
437 dev_dbg(xpc_part, "partid = %d, heartbeat = %ld, last_heartbeat"
438 " = %ld, heartbeat_offline = %ld, HB_mask = 0x%lx\n",
439 partid, remote_vars->heartbeat, part->last_heartbeat,
440 remote_vars->heartbeat_offline,
441 remote_vars->heartbeating_to_mask);
442
443 if (((remote_vars->heartbeat == part->last_heartbeat) &&
444 (remote_vars->heartbeat_offline == 0)) ||
445 !xpc_hb_allowed(sn_partition_id, remote_vars)) {
446
447 XPC_DEACTIVATE_PARTITION(part, xpcNoHeartbeat);
448 continue;
449 }
450
451 part->last_heartbeat = remote_vars->heartbeat;
452 }
453}
454
455/*
456 * Get a copy of a portion of the remote partition's rsvd page.
457 *
458 * remote_rp points to a buffer that is cacheline aligned for BTE copies and
459 * is large enough to contain a copy of their reserved page header and
460 * part_nasids mask.
461 */
462static enum xpc_retval
463xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
464 struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
465{
466 int bres, i;
467
468 /* get the reserved page's physical address */
469
470 *remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
471 if (*remote_rp_pa == 0)
472 return xpcNoRsvdPageAddr;
473
474 /* pull over the reserved page header and part_nasids mask */
475 bres = xp_bte_copy(*remote_rp_pa, (u64)remote_rp,
476 XPC_RP_HEADER_SIZE + xp_nasid_mask_bytes,
477 (BTE_NOTIFY | BTE_WACQUIRE), NULL);
478 if (bres != BTE_SUCCESS)
479 return xpc_map_bte_errors(bres);
480
481 if (discovered_nasids != NULL) {
482 u64 *remote_part_nasids = XPC_RP_PART_NASIDS(remote_rp);
483
484 for (i = 0; i < xp_nasid_mask_words; i++)
485 discovered_nasids[i] |= remote_part_nasids[i];
486 }
487
488 /* check that the partid is for another partition */
489
490 if (remote_rp->partid < 1 ||
491 remote_rp->partid > (XP_MAX_PARTITIONS - 1)) {
492 return xpcInvalidPartid;
493 }
494
495 if (remote_rp->partid == sn_partition_id)
496 return xpcLocalPartid;
497
498 if (XPC_VERSION_MAJOR(remote_rp->version) !=
499 XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
500 return xpcBadVersion;
501 }
502
503 return xpcSuccess;
504}
505
506/*
507 * Get a copy of the remote partition's XPC variables from the reserved page.
508 *
509 * remote_vars points to a buffer that is cacheline aligned for BTE copies and
510 * assumed to be of size XPC_RP_VARS_SIZE.
511 */
512static enum xpc_retval
513xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars)
514{
515 int bres;
516
517 if (remote_vars_pa == 0)
518 return xpcVarsNotSet;
519
520 /* pull over the cross partition variables */
521 bres = xp_bte_copy(remote_vars_pa, (u64)remote_vars, XPC_RP_VARS_SIZE,
522 (BTE_NOTIFY | BTE_WACQUIRE), NULL);
523 if (bres != BTE_SUCCESS)
524 return xpc_map_bte_errors(bres);
525
526 if (XPC_VERSION_MAJOR(remote_vars->version) !=
527 XPC_VERSION_MAJOR(XPC_V_VERSION)) {
528 return xpcBadVersion;
529 }
530
531 return xpcSuccess;
532}
533
534/*
535 * Update the remote partition's info.
536 */
537static void
538xpc_update_partition_info(struct xpc_partition *part, u8 remote_rp_version,
539 struct timespec *remote_rp_stamp, u64 remote_rp_pa,
540 u64 remote_vars_pa, struct xpc_vars *remote_vars)
541{
542 part->remote_rp_version = remote_rp_version;
543 dev_dbg(xpc_part, " remote_rp_version = 0x%016x\n",
544 part->remote_rp_version);
545
546 part->remote_rp_stamp = *remote_rp_stamp;
547 dev_dbg(xpc_part, " remote_rp_stamp (tv_sec = 0x%lx tv_nsec = 0x%lx\n",
548 part->remote_rp_stamp.tv_sec, part->remote_rp_stamp.tv_nsec);
549
550 part->remote_rp_pa = remote_rp_pa;
551 dev_dbg(xpc_part, " remote_rp_pa = 0x%016lx\n", part->remote_rp_pa);
552
553 part->remote_vars_pa = remote_vars_pa;
554 dev_dbg(xpc_part, " remote_vars_pa = 0x%016lx\n",
555 part->remote_vars_pa);
556
557 part->last_heartbeat = remote_vars->heartbeat;
558 dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n",
559 part->last_heartbeat);
560
561 part->remote_vars_part_pa = remote_vars->vars_part_pa;
562 dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n",
563 part->remote_vars_part_pa);
564
565 part->remote_act_nasid = remote_vars->act_nasid;
566 dev_dbg(xpc_part, " remote_act_nasid = 0x%x\n",
567 part->remote_act_nasid);
568
569 part->remote_act_phys_cpuid = remote_vars->act_phys_cpuid;
570 dev_dbg(xpc_part, " remote_act_phys_cpuid = 0x%x\n",
571 part->remote_act_phys_cpuid);
572
573 part->remote_amos_page_pa = remote_vars->amos_page_pa;
574 dev_dbg(xpc_part, " remote_amos_page_pa = 0x%lx\n",
575 part->remote_amos_page_pa);
576
577 part->remote_vars_version = remote_vars->version;
578 dev_dbg(xpc_part, " remote_vars_version = 0x%x\n",
579 part->remote_vars_version);
580}
581
582/*
583 * Prior code has determined the nasid which generated an IPI. Inspect
584 * that nasid to determine if its partition needs to be activated or
585 * deactivated.
586 *
587 * A partition is consider "awaiting activation" if our partition
588 * flags indicate it is not active and it has a heartbeat. A
589 * partition is considered "awaiting deactivation" if our partition
590 * flags indicate it is active but it has no heartbeat or it is not
591 * sending its heartbeat to us.
592 *
593 * To determine the heartbeat, the remote nasid must have a properly
594 * initialized reserved page.
595 */
596static void
597xpc_identify_act_IRQ_req(int nasid)
598{
599 struct xpc_rsvd_page *remote_rp;
600 struct xpc_vars *remote_vars;
601 u64 remote_rp_pa;
602 u64 remote_vars_pa;
603 int remote_rp_version;
604 int reactivate = 0;
605 int stamp_diff;
606 struct timespec remote_rp_stamp = { 0, 0 };
607 partid_t partid;
608 struct xpc_partition *part;
609 enum xpc_retval ret;
610
611 /* pull over the reserved page structure */
612
613 remote_rp = (struct xpc_rsvd_page *)xpc_remote_copy_buffer;
614
615 ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rp_pa);
616 if (ret != xpcSuccess) {
617 dev_warn(xpc_part, "unable to get reserved page from nasid %d, "
618 "which sent interrupt, reason=%d\n", nasid, ret);
619 return;
620 }
621
622 remote_vars_pa = remote_rp->vars_pa;
623 remote_rp_version = remote_rp->version;
624 if (XPC_SUPPORTS_RP_STAMP(remote_rp_version))
625 remote_rp_stamp = remote_rp->stamp;
626
627 partid = remote_rp->partid;
628 part = &xpc_partitions[partid];
629
630 /* pull over the cross partition variables */
631
632 remote_vars = (struct xpc_vars *)xpc_remote_copy_buffer;
633
634 ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
635 if (ret != xpcSuccess) {
636
637 dev_warn(xpc_part, "unable to get XPC variables from nasid %d, "
638 "which sent interrupt, reason=%d\n", nasid, ret);
639
640 XPC_DEACTIVATE_PARTITION(part, ret);
641 return;
642 }
643
644 part->act_IRQ_rcvd++;
645
646 dev_dbg(xpc_part, "partid for nasid %d is %d; IRQs = %d; HB = "
647 "%ld:0x%lx\n", (int)nasid, (int)partid, part->act_IRQ_rcvd,
648 remote_vars->heartbeat, remote_vars->heartbeating_to_mask);
649
650 if (xpc_partition_disengaged(part) &&
651 part->act_state == XPC_P_INACTIVE) {
652
653 xpc_update_partition_info(part, remote_rp_version,
654 &remote_rp_stamp, remote_rp_pa,
655 remote_vars_pa, remote_vars);
656
657 if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
658 if (xpc_partition_disengage_requested(1UL << partid)) {
659 /*
660 * Other side is waiting on us to disengage,
661 * even though we already have.
662 */
663 return;
664 }
665 } else {
666 /* other side doesn't support disengage requests */
667 xpc_clear_partition_disengage_request(1UL << partid);
668 }
669
670 xpc_activate_partition(part);
671 return;
672 }
673
674 DBUG_ON(part->remote_rp_version == 0);
675 DBUG_ON(part->remote_vars_version == 0);
676
677 if (!XPC_SUPPORTS_RP_STAMP(part->remote_rp_version)) {
678 DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(part->
679 remote_vars_version));
680
681 if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
682 DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
683 version));
684 /* see if the other side rebooted */
685 if (part->remote_amos_page_pa ==
686 remote_vars->amos_page_pa &&
687 xpc_hb_allowed(sn_partition_id, remote_vars)) {
688 /* doesn't look that way, so ignore the IPI */
689 return;
690 }
691 }
692
693 /*
694 * Other side rebooted and previous XPC didn't support the
695 * disengage request, so we don't need to do anything special.
696 */
697
698 xpc_update_partition_info(part, remote_rp_version,
699 &remote_rp_stamp, remote_rp_pa,
700 remote_vars_pa, remote_vars);
701 part->reactivate_nasid = nasid;
702 XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
703 return;
704 }
705
706 DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version));
707
708 if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
709 DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
710
711 /*
712 * Other side rebooted and previous XPC did support the
713 * disengage request, but the new one doesn't.
714 */
715
716 xpc_clear_partition_engaged(1UL << partid);
717 xpc_clear_partition_disengage_request(1UL << partid);
718
719 xpc_update_partition_info(part, remote_rp_version,
720 &remote_rp_stamp, remote_rp_pa,
721 remote_vars_pa, remote_vars);
722 reactivate = 1;
723
724 } else {
725 DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
726
727 stamp_diff = xpc_compare_stamps(&part->remote_rp_stamp,
728 &remote_rp_stamp);
729 if (stamp_diff != 0) {
730 DBUG_ON(stamp_diff >= 0);
731
732 /*
733 * Other side rebooted and the previous XPC did support
734 * the disengage request, as does the new one.
735 */
736
737 DBUG_ON(xpc_partition_engaged(1UL << partid));
738 DBUG_ON(xpc_partition_disengage_requested(1UL <<
739 partid));
740
741 xpc_update_partition_info(part, remote_rp_version,
742 &remote_rp_stamp,
743 remote_rp_pa, remote_vars_pa,
744 remote_vars);
745 reactivate = 1;
746 }
747 }
748
749 if (part->disengage_request_timeout > 0 &&
750 !xpc_partition_disengaged(part)) {
751 /* still waiting on other side to disengage from us */
752 return;
753 }
754
755 if (reactivate) {
756 part->reactivate_nasid = nasid;
757 XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
758
759 } else if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version) &&
760 xpc_partition_disengage_requested(1UL << partid)) {
761 XPC_DEACTIVATE_PARTITION(part, xpcOtherGoingDown);
762 }
763}
764
765/*
766 * Loop through the activation AMO variables and process any bits
767 * which are set. Each bit indicates a nasid sending a partition
768 * activation or deactivation request.
769 *
770 * Return #of IRQs detected.
771 */
772int
773xpc_identify_act_IRQ_sender(void)
774{
775 int word, bit;
776 u64 nasid_mask;
777 u64 nasid; /* remote nasid */
778 int n_IRQs_detected = 0;
779 AMO_t *act_amos;
780
781 act_amos = xpc_vars->amos_page + XPC_ACTIVATE_IRQ_AMOS;
782
783 /* scan through act AMO variable looking for non-zero entries */
784 for (word = 0; word < xp_nasid_mask_words; word++) {
785
786 if (xpc_exiting)
787 break;
788
789 nasid_mask = xpc_IPI_receive(&act_amos[word]);
790 if (nasid_mask == 0) {
791 /* no IRQs from nasids in this variable */
792 continue;
793 }
794
795 dev_dbg(xpc_part, "AMO[%d] gave back 0x%lx\n", word,
796 nasid_mask);
797
798 /*
799 * If this nasid has been added to the machine since
800 * our partition was reset, this will retain the
801 * remote nasid in our reserved pages machine mask.
802 * This is used in the event of module reload.
803 */
804 xpc_mach_nasids[word] |= nasid_mask;
805
806 /* locate the nasid(s) which sent interrupts */
807
808 for (bit = 0; bit < (8 * sizeof(u64)); bit++) {
809 if (nasid_mask & (1UL << bit)) {
810 n_IRQs_detected++;
811 nasid = XPC_NASID_FROM_W_B(word, bit);
812 dev_dbg(xpc_part, "interrupt from nasid %ld\n",
813 nasid);
814 xpc_identify_act_IRQ_req(nasid);
815 }
816 }
817 }
818 return n_IRQs_detected;
819}
820
821/*
822 * See if the other side has responded to a partition disengage request
823 * from us.
824 */
825int
826xpc_partition_disengaged(struct xpc_partition *part)
827{
828 partid_t partid = XPC_PARTID(part);
829 int disengaged;
830
831 disengaged = (xpc_partition_engaged(1UL << partid) == 0);
832 if (part->disengage_request_timeout) {
833 if (!disengaged) {
834 if (time_before(jiffies,
835 part->disengage_request_timeout)) {
836 /* timelimit hasn't been reached yet */
837 return 0;
838 }
839
840 /*
841 * Other side hasn't responded to our disengage
842 * request in a timely fashion, so assume it's dead.
843 */
844
845 dev_info(xpc_part, "disengage from remote partition %d "
846 "timed out\n", partid);
847 xpc_disengage_request_timedout = 1;
848 xpc_clear_partition_engaged(1UL << partid);
849 disengaged = 1;
850 }
851 part->disengage_request_timeout = 0;
852
853 /* cancel the timer function, provided it's not us */
854 if (!in_interrupt()) {
855 del_singleshot_timer_sync(&part->
856 disengage_request_timer);
857 }
858
859 DBUG_ON(part->act_state != XPC_P_DEACTIVATING &&
860 part->act_state != XPC_P_INACTIVE);
861 if (part->act_state != XPC_P_INACTIVE)
862 xpc_wakeup_channel_mgr(part);
863
864 if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version))
865 xpc_cancel_partition_disengage_request(part);
866 }
867 return disengaged;
868}
869
870/*
871 * Mark specified partition as active.
872 */
873enum xpc_retval
874xpc_mark_partition_active(struct xpc_partition *part)
875{
876 unsigned long irq_flags;
877 enum xpc_retval ret;
878
879 dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
880
881 spin_lock_irqsave(&part->act_lock, irq_flags);
882 if (part->act_state == XPC_P_ACTIVATING) {
883 part->act_state = XPC_P_ACTIVE;
884 ret = xpcSuccess;
885 } else {
886 DBUG_ON(part->reason == xpcSuccess);
887 ret = part->reason;
888 }
889 spin_unlock_irqrestore(&part->act_lock, irq_flags);
890
891 return ret;
892}
893
894/*
895 * Notify XPC that the partition is down.
896 */
897void
898xpc_deactivate_partition(const int line, struct xpc_partition *part,
899 enum xpc_retval reason)
900{
901 unsigned long irq_flags;
902
903 spin_lock_irqsave(&part->act_lock, irq_flags);
904
905 if (part->act_state == XPC_P_INACTIVE) {
906 XPC_SET_REASON(part, reason, line);
907 spin_unlock_irqrestore(&part->act_lock, irq_flags);
908 if (reason == xpcReactivating) {
909 /* we interrupt ourselves to reactivate partition */
910 xpc_IPI_send_reactivate(part);
911 }
912 return;
913 }
914 if (part->act_state == XPC_P_DEACTIVATING) {
915 if ((part->reason == xpcUnloading && reason != xpcUnloading) ||
916 reason == xpcReactivating) {
917 XPC_SET_REASON(part, reason, line);
918 }
919 spin_unlock_irqrestore(&part->act_lock, irq_flags);
920 return;
921 }
922
923 part->act_state = XPC_P_DEACTIVATING;
924 XPC_SET_REASON(part, reason, line);
925
926 spin_unlock_irqrestore(&part->act_lock, irq_flags);
927
928 if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
929 xpc_request_partition_disengage(part);
930 xpc_IPI_send_disengage(part);
931
932 /* set a timelimit on the disengage request */
933 part->disengage_request_timeout = jiffies +
934 (xpc_disengage_request_timelimit * HZ);
935 part->disengage_request_timer.expires =
936 part->disengage_request_timeout;
937 add_timer(&part->disengage_request_timer);
938 }
939
940 dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n",
941 XPC_PARTID(part), reason);
942
943 xpc_partition_going_down(part, reason);
944}
945
946/*
947 * Mark specified partition as inactive.
948 */
949void
950xpc_mark_partition_inactive(struct xpc_partition *part)
951{
952 unsigned long irq_flags;
953
954 dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
955 XPC_PARTID(part));
956
957 spin_lock_irqsave(&part->act_lock, irq_flags);
958 part->act_state = XPC_P_INACTIVE;
959 spin_unlock_irqrestore(&part->act_lock, irq_flags);
960 part->remote_rp_pa = 0;
961}
962
963/*
964 * SAL has provided a partition and machine mask. The partition mask
965 * contains a bit for each even nasid in our partition. The machine
966 * mask contains a bit for each even nasid in the entire machine.
967 *
968 * Using those two bit arrays, we can determine which nasids are
969 * known in the machine. Each should also have a reserved page
970 * initialized if they are available for partitioning.
971 */
972void
973xpc_discovery(void)
974{
975 void *remote_rp_base;
976 struct xpc_rsvd_page *remote_rp;
977 struct xpc_vars *remote_vars;
978 u64 remote_rp_pa;
979 u64 remote_vars_pa;
980 int region;
981 int region_size;
982 int max_regions;
983 int nasid;
984 struct xpc_rsvd_page *rp;
985 partid_t partid;
986 struct xpc_partition *part;
987 u64 *discovered_nasids;
988 enum xpc_retval ret;
989
990 remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
991 xp_nasid_mask_bytes,
992 GFP_KERNEL, &remote_rp_base);
993 if (remote_rp == NULL)
994 return;
995
996 remote_vars = (struct xpc_vars *)remote_rp;
997
998 discovered_nasids = kzalloc(sizeof(u64) * xp_nasid_mask_words,
999 GFP_KERNEL);
1000 if (discovered_nasids == NULL) {
1001 kfree(remote_rp_base);
1002 return;
1003 }
1004
1005 rp = (struct xpc_rsvd_page *)xpc_rsvd_page;
1006
1007 /*
1008 * The term 'region' in this context refers to the minimum number of
1009 * nodes that can comprise an access protection grouping. The access
1010 * protection is in regards to memory, IOI and IPI.
1011 */
1012 max_regions = 64;
1013 region_size = sn_region_size;
1014
1015 switch (region_size) {
1016 case 128:
1017 max_regions *= 2;
1018 case 64:
1019 max_regions *= 2;
1020 case 32:
1021 max_regions *= 2;
1022 region_size = 16;
1023 DBUG_ON(!is_shub2());
1024 }
1025
1026 for (region = 0; region < max_regions; region++) {
1027
1028 if (xpc_exiting)
1029 break;
1030
1031 dev_dbg(xpc_part, "searching region %d\n", region);
1032
1033 for (nasid = (region * region_size * 2);
1034 nasid < ((region + 1) * region_size * 2); nasid += 2) {
1035
1036 if (xpc_exiting)
1037 break;
1038
1039 dev_dbg(xpc_part, "checking nasid %d\n", nasid);
1040
1041 if (XPC_NASID_IN_ARRAY(nasid, xpc_part_nasids)) {
1042 dev_dbg(xpc_part, "PROM indicates Nasid %d is "
1043 "part of the local partition; skipping "
1044 "region\n", nasid);
1045 break;
1046 }
1047
1048 if (!(XPC_NASID_IN_ARRAY(nasid, xpc_mach_nasids))) {
1049 dev_dbg(xpc_part, "PROM indicates Nasid %d was "
1050 "not on Numa-Link network at reset\n",
1051 nasid);
1052 continue;
1053 }
1054
1055 if (XPC_NASID_IN_ARRAY(nasid, discovered_nasids)) {
1056 dev_dbg(xpc_part, "Nasid %d is part of a "
1057 "partition which was previously "
1058 "discovered\n", nasid);
1059 continue;
1060 }
1061
1062 /* pull over the reserved page structure */
1063
1064 ret = xpc_get_remote_rp(nasid, discovered_nasids,
1065 remote_rp, &remote_rp_pa);
1066 if (ret != xpcSuccess) {
1067 dev_dbg(xpc_part, "unable to get reserved page "
1068 "from nasid %d, reason=%d\n", nasid,
1069 ret);
1070
1071 if (ret == xpcLocalPartid)
1072 break;
1073
1074 continue;
1075 }
1076
1077 remote_vars_pa = remote_rp->vars_pa;
1078
1079 partid = remote_rp->partid;
1080 part = &xpc_partitions[partid];
1081
1082 /* pull over the cross partition variables */
1083
1084 ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
1085 if (ret != xpcSuccess) {
1086 dev_dbg(xpc_part, "unable to get XPC variables "
1087 "from nasid %d, reason=%d\n", nasid,
1088 ret);
1089
1090 XPC_DEACTIVATE_PARTITION(part, ret);
1091 continue;
1092 }
1093
1094 if (part->act_state != XPC_P_INACTIVE) {
1095 dev_dbg(xpc_part, "partition %d on nasid %d is "
1096 "already activating\n", partid, nasid);
1097 break;
1098 }
1099
1100 /*
1101 * Register the remote partition's AMOs with SAL so it
1102 * can handle and cleanup errors within that address
1103 * range should the remote partition go down. We don't
1104 * unregister this range because it is difficult to
1105 * tell when outstanding writes to the remote partition
1106 * are finished and thus when it is thus safe to
1107 * unregister. This should not result in wasted space
1108 * in the SAL xp_addr_region table because we should
1109 * get the same page for remote_act_amos_pa after
1110 * module reloads and system reboots.
1111 */
1112 if (sn_register_xp_addr_region
1113 (remote_vars->amos_page_pa, PAGE_SIZE, 1) < 0) {
1114 dev_dbg(xpc_part,
1115 "partition %d failed to "
1116 "register xp_addr region 0x%016lx\n",
1117 partid, remote_vars->amos_page_pa);
1118
1119 XPC_SET_REASON(part, xpcPhysAddrRegFailed,
1120 __LINE__);
1121 break;
1122 }
1123
1124 /*
1125 * The remote nasid is valid and available.
1126 * Send an interrupt to that nasid to notify
1127 * it that we are ready to begin activation.
1128 */
1129 dev_dbg(xpc_part, "sending an interrupt to AMO 0x%lx, "
1130 "nasid %d, phys_cpuid 0x%x\n",
1131 remote_vars->amos_page_pa,
1132 remote_vars->act_nasid,
1133 remote_vars->act_phys_cpuid);
1134
1135 if (XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
1136 version)) {
1137 part->remote_amos_page_pa =
1138 remote_vars->amos_page_pa;
1139 xpc_mark_partition_disengaged(part);
1140 xpc_cancel_partition_disengage_request(part);
1141 }
1142 xpc_IPI_send_activate(remote_vars);
1143 }
1144 }
1145
1146 kfree(discovered_nasids);
1147 kfree(remote_rp_base);
1148}
1149
1150/*
1151 * Given a partid, get the nasids owned by that partition from the
1152 * remote partition's reserved page.
1153 */
1154enum xpc_retval
1155xpc_initiate_partid_to_nasids(partid_t partid, void *nasid_mask)
1156{
1157 struct xpc_partition *part;
1158 u64 part_nasid_pa;
1159 int bte_res;
1160
1161 part = &xpc_partitions[partid];
1162 if (part->remote_rp_pa == 0)
1163 return xpcPartitionDown;
1164
1165 memset(nasid_mask, 0, XP_NASID_MASK_BYTES);
1166
1167 part_nasid_pa = (u64)XPC_RP_PART_NASIDS(part->remote_rp_pa);
1168
1169 bte_res = xp_bte_copy(part_nasid_pa, (u64)nasid_mask,
1170 xp_nasid_mask_bytes, (BTE_NOTIFY | BTE_WACQUIRE),
1171 NULL);
1172
1173 return xpc_map_bte_errors(bte_res);
1174}
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-03 09:49:48 -0500