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[src/trunk]: src/sys/arch/alpha When removing mappings, hang PV entries to be...
details: https://anonhg.NetBSD.org/src/rev/bc9e5022dd21
branches: trunk
changeset: 983621:bc9e5022dd21
user: thorpej <thorpej%NetBSD.org@localhost>
date: Sun May 30 14:06:37 2021 +0000
description:
When removing mappings, hang PV entries to be freed off of the
pmap_tlb_context structure, and free them back in bulk after we
release all of our locks (as we do with PT pages that are freed).
diffstat:
sys/arch/alpha/alpha/pmap.c | 183 ++++++++++++++++++++++++-----------------
sys/arch/alpha/include/pmap.h | 5 +-
2 files changed, 109 insertions(+), 79 deletions(-)
diffs (truncated from 333 to 300 lines):
diff -r 522028f8bfba -r bc9e5022dd21 sys/arch/alpha/alpha/pmap.c
--- a/sys/arch/alpha/alpha/pmap.c Sun May 30 13:34:21 2021 +0000
+++ b/sys/arch/alpha/alpha/pmap.c Sun May 30 14:06:37 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.288 2021/05/30 13:34:21 thorpej Exp $ */
+/* $NetBSD: pmap.c,v 1.289 2021/05/30 14:06:37 thorpej Exp $ */
/*-
* Copyright (c) 1998, 1999, 2000, 2001, 2007, 2008, 2020
@@ -135,7 +135,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.288 2021/05/30 13:34:21 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.289 2021/05/30 14:06:37 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -432,6 +432,71 @@
#endif /* MULTIPROCESSOR */
/*
+ * TLB context structure; see description in "TLB management" section
+ * below.
+ */
+#define TLB_CTX_MAXVA 8
+#define TLB_CTX_ALLVA PAGE_MASK
+struct pmap_tlb_context {
+ uintptr_t t_addrdata[TLB_CTX_MAXVA];
+ pmap_t t_pmap;
+ struct pmap_pagelist t_freeptq;
+ struct pmap_pvlist t_freepvq;
+};
+
+/*
+ * Internal routines
+ */
+static void alpha_protection_init(void);
+static pt_entry_t pmap_remove_mapping(pmap_t, vaddr_t, pt_entry_t *, bool,
+ pv_entry_t *,
+ struct pmap_tlb_context *);
+static void pmap_changebit(struct vm_page *, pt_entry_t, pt_entry_t,
+ struct pmap_tlb_context *);
+
+/*
+ * PT page management functions.
+ */
+static int pmap_ptpage_alloc(pmap_t, pt_entry_t *, int);
+static void pmap_ptpage_free(pmap_t, pt_entry_t *,
+ struct pmap_tlb_context *);
+static void pmap_l3pt_delref(pmap_t, vaddr_t, pt_entry_t *,
+ struct pmap_tlb_context *);
+static void pmap_l2pt_delref(pmap_t, pt_entry_t *, pt_entry_t *,
+ struct pmap_tlb_context *);
+static void pmap_l1pt_delref(pmap_t, pt_entry_t *);
+
+static void *pmap_l1pt_alloc(struct pool *, int);
+static void pmap_l1pt_free(struct pool *, void *);
+
+static struct pool_allocator pmap_l1pt_allocator = {
+ pmap_l1pt_alloc, pmap_l1pt_free, 0,
+};
+
+static int pmap_l1pt_ctor(void *, void *, int);
+
+/*
+ * PV table management functions.
+ */
+static int pmap_pv_enter(pmap_t, struct vm_page *, vaddr_t, pt_entry_t *,
+ bool, pv_entry_t);
+static void pmap_pv_remove(pmap_t, struct vm_page *, vaddr_t, bool,
+ pv_entry_t *, struct pmap_tlb_context *);
+static void *pmap_pv_page_alloc(struct pool *, int);
+static void pmap_pv_page_free(struct pool *, void *);
+
+static struct pool_allocator pmap_pv_page_allocator = {
+ pmap_pv_page_alloc, pmap_pv_page_free, 0,
+};
+
+#ifdef DEBUG
+void pmap_pv_dump(paddr_t);
+#endif
+
+#define pmap_pv_alloc() pool_cache_get(&pmap_pv_cache, PR_NOWAIT)
+#define pmap_pv_free(pv) pool_cache_put(&pmap_pv_cache, (pv))
+
+/*
* Generic routine for freeing pages on a pmap_pagelist back to
* the system.
*/
@@ -447,6 +512,21 @@
}
/*
+ * Generic routine for freeing a list of PV entries back to the
+ * system.
+ */
+static void
+pmap_pvlist_free(struct pmap_pvlist * const list)
+{
+ pv_entry_t pv;
+
+ while ((pv = LIST_FIRST(list)) != NULL) {
+ LIST_REMOVE(pv, pv_link);
+ pmap_pv_free(pv);
+ }
+}
+
+/*
* TLB management.
*
* TLB invalidations need to be performed on local and remote CPUs
@@ -518,9 +598,6 @@
* window size (defined as 64KB on alpha in <machine/vmparam.h>).
*/
-#define TLB_CTX_MAXVA 8
-#define TLB_CTX_ALLVA PAGE_MASK
-
#define TLB_CTX_F_ASM __BIT(0)
#define TLB_CTX_F_IMB __BIT(1)
#define TLB_CTX_F_KIMB __BIT(2)
@@ -538,12 +615,6 @@
#define TLB_CTX_SETVA(ctx, i, va) \
(ctx)->t_addrdata[(i)] = (va) | ((ctx)->t_addrdata[(i)] & PAGE_MASK)
-struct pmap_tlb_context {
- uintptr_t t_addrdata[TLB_CTX_MAXVA];
- pmap_t t_pmap;
- struct pmap_pagelist t_freeptq;
-};
-
static struct {
kmutex_t lock;
struct evcnt events;
@@ -689,6 +760,7 @@
tlbctx->t_addrdata[1] = flags;
tlbctx->t_pmap = NULL;
LIST_INIT(&tlbctx->t_freeptq);
+ LIST_INIT(&tlbctx->t_freepvq);
}
static void
@@ -1081,65 +1153,18 @@
}
#endif /* MULTIPROCESSOR */
-static __inline void
-pmap_tlb_ptpage_drain(struct pmap_tlb_context * const tlbctx)
+static inline void
+pmap_tlb_context_drain(struct pmap_tlb_context * const tlbctx)
{
- pmap_pagelist_free(&tlbctx->t_freeptq);
+ if (! LIST_EMPTY(&tlbctx->t_freeptq)) {
+ pmap_pagelist_free(&tlbctx->t_freeptq);
+ }
+ if (! LIST_EMPTY(&tlbctx->t_freepvq)) {
+ pmap_pvlist_free(&tlbctx->t_freepvq);
+ }
}
/*
- * Internal routines
- */
-static void alpha_protection_init(void);
-static pt_entry_t pmap_remove_mapping(pmap_t, vaddr_t, pt_entry_t *, bool,
- pv_entry_t *,
- struct pmap_tlb_context *);
-static void pmap_changebit(struct vm_page *, pt_entry_t, pt_entry_t,
- struct pmap_tlb_context *);
-
-/*
- * PT page management functions.
- */
-static int pmap_ptpage_alloc(pmap_t, pt_entry_t *, int);
-static void pmap_ptpage_free(pmap_t, pt_entry_t *,
- struct pmap_tlb_context *);
-static void pmap_l3pt_delref(pmap_t, vaddr_t, pt_entry_t *,
- struct pmap_tlb_context *);
-static void pmap_l2pt_delref(pmap_t, pt_entry_t *, pt_entry_t *,
- struct pmap_tlb_context *);
-static void pmap_l1pt_delref(pmap_t, pt_entry_t *);
-
-static void *pmap_l1pt_alloc(struct pool *, int);
-static void pmap_l1pt_free(struct pool *, void *);
-
-static struct pool_allocator pmap_l1pt_allocator = {
- pmap_l1pt_alloc, pmap_l1pt_free, 0,
-};
-
-static int pmap_l1pt_ctor(void *, void *, int);
-
-/*
- * PV table management functions.
- */
-static int pmap_pv_enter(pmap_t, struct vm_page *, vaddr_t, pt_entry_t *,
- bool, pv_entry_t);
-static void pmap_pv_remove(pmap_t, struct vm_page *, vaddr_t, bool,
- pv_entry_t *);
-static void *pmap_pv_page_alloc(struct pool *, int);
-static void pmap_pv_page_free(struct pool *, void *);
-
-static struct pool_allocator pmap_pv_page_allocator = {
- pmap_pv_page_alloc, pmap_pv_page_free, 0,
-};
-
-#ifdef DEBUG
-void pmap_pv_dump(paddr_t);
-#endif
-
-#define pmap_pv_alloc() pool_cache_get(&pmap_pv_cache, PR_NOWAIT)
-#define pmap_pv_free(pv) pool_cache_put(&pmap_pv_cache, (pv))
-
-/*
* ASN management functions.
*/
static u_int pmap_asn_alloc(pmap_t, struct cpu_info *);
@@ -1721,6 +1746,8 @@
pmap_tlb_shootnow(tlbctx);
/* kernel PT pages are never freed. */
KASSERT(LIST_EMPTY(&tlbctx->t_freeptq));
+ /* ...but we might have freed PV entries. */
+ pmap_tlb_context_drain(tlbctx);
TLB_COUNT(reason_remove_kernel);
return;
@@ -1803,7 +1830,7 @@
PMAP_MAP_TO_HEAD_UNLOCK();
PMAP_UNLOCK(pmap);
pmap_tlb_shootnow(tlbctx);
- pmap_tlb_ptpage_drain(tlbctx);
+ pmap_tlb_context_drain(tlbctx);
TLB_COUNT(reason_remove_user);
}
@@ -1895,7 +1922,7 @@
mutex_exit(lock);
PMAP_HEAD_TO_MAP_UNLOCK();
pmap_tlb_shootnow(&tlbctx);
- pmap_tlb_ptpage_drain(&tlbctx);
+ pmap_tlb_context_drain(&tlbctx);
TLB_COUNT(reason_page_protect_none);
}
@@ -2007,7 +2034,7 @@
pmap_l2pt_delref(pmap, l1pte, l2pte, &tlbctx);
PMAP_UNLOCK(pmap);
pmap_tlb_shootnow(&tlbctx);
- pmap_tlb_ptpage_drain(&tlbctx);
+ pmap_tlb_context_drain(&tlbctx);
TLB_COUNT(reason_enter_l2pt_delref);
}
@@ -2035,7 +2062,7 @@
pmap_l3pt_delref(pmap, va, pte, &tlbctx);
PMAP_UNLOCK(pmap);
pmap_tlb_shootnow(&tlbctx);
- pmap_tlb_ptpage_drain(&tlbctx);
+ pmap_tlb_context_drain(&tlbctx);
TLB_COUNT(reason_enter_l3pt_delref);
}
@@ -2936,8 +2963,8 @@
#ifdef DEBUG
if (pmapdebug & (PDB_FOLLOW|PDB_REMOVE|PDB_PROTECT))
- printf("pmap_remove_mapping(%p, %lx, %p, %d, %p)\n",
- pmap, va, pte, dolock, opvp);
+ printf("pmap_remove_mapping(%p, %lx, %p, %d, %p, %p)\n",
+ pmap, va, pte, dolock, opvp, tlbctx);
#endif
/*
@@ -2988,7 +3015,7 @@
*/
pg = PHYS_TO_VM_PAGE(pa);
KASSERT(pg != NULL);
- pmap_pv_remove(pmap, pg, va, dolock, opvp);
+ pmap_pv_remove(pmap, pg, va, dolock, opvp, tlbctx);
KASSERT(opvp == NULL || *opvp != NULL);
}
@@ -3296,7 +3323,7 @@
*/
static void
pmap_pv_remove(pmap_t pmap, struct vm_page *pg, vaddr_t va, bool dolock,
- pv_entry_t *opvp)
+ pv_entry_t *opvp, struct pmap_tlb_context * const tlbctx)
{
struct vm_page_md * const md = VM_PAGE_TO_MD(pg);
pv_entry_t pv, *pvp;
@@ -3333,10 +3360,12 @@
mutex_exit(lock);
}
- if (opvp != NULL)
+ if (opvp != NULL) {
*opvp = pv;
- else
- pmap_pv_free(pv);
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