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When we detect stale TSB entries during a context switch, don't enter DDB

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but invalidate the stale entries and print a warning.

ok claudio@, deraadt@
This commit is contained in:
kettenis
2026-04-13 09:10:14 +00:00
parent 7a7df3e9b7
commit 5118a09c2e
1 changed files with 21 additions and 5 deletions
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26
sys/arch/sparc64/sparc64/pmap.c
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@@ -1,4 +1,4 @@
/* $OpenBSD: pmap.c,v 1.127 2025/12/14 12:37:22 kettenis Exp $ */
/* $OpenBSD: pmap.c,v 1.128 2026/04/13 09:10:14 kettenis Exp $ */
/* $NetBSD: pmap.c,v 1.107 2001/08/31 16:47:41 eeh Exp $ */
/*
*
@@ -2579,6 +2579,7 @@ ctx_free(struct pmap *pm)
{
int oldctx;
#ifdef DIAGNOSTIC
u_int64_t tag, data;
int i;
#endif
@@ -2597,10 +2598,25 @@ ctx_free(struct pmap *pm)
db_enter();
}
for (i = 0; i < TSBENTS; i++) {
if (TSB_TAG_CTX(tsb_dmmu[i].tag) == oldctx ||
TSB_TAG_CTX(tsb_immu[i].tag) == oldctx) {
printf("ctx_free: context %d still active\n", oldctx);
db_enter();
tag = READ_ONCE(tsb_dmmu[i].tag);
if (TSB_TAG_CTX(tag) == oldctx) {
data = READ_ONCE(tsb_dmmu[i].data);
atomic_cas_ulong((unsigned long *)&tsb_dmmu[i].tag,
tag, TSB_TAG_INVALID);
printf("%s: context %d still active in DMMU TSB\n",
__func__, oldctx);
printf("%s: tag 0x%016llx data 0x%016llx\n",
__func__, tag, data);
}
tag = READ_ONCE(tsb_immu[i].tag);
if (TSB_TAG_CTX(tag) == oldctx) {
data = READ_ONCE(tsb_immu[i].data);
atomic_cas_ulong((unsigned long *)&tsb_immu[i].tag,
tag, TSB_TAG_INVALID);
printf("%s: context %d still active in IMMU TSB\n",
__func__, oldctx);
printf("%s: tag 0x%016llx data 0x%016llx\n",
__func__, tag, data);
}
}
#endif