[src/trunk]: src/sys/arch/alpha Track the PT pages allocated to a pmap in the...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2e84b30f6664
branches:  trunk
changeset: 983587:2e84b30f6664
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sun May 30 01:41:45 2021 +0000

description:
Track the PT pages allocated to a pmap in the pmap itself.

diffstat:

 sys/arch/alpha/alpha/pmap.c   |  52 ++++++++++++++++++++----------------------
 sys/arch/alpha/include/pmap.h |   6 ++--
 2 files changed, 28 insertions(+), 30 deletions(-)

diffs (173 lines):

diff -r 03667436cd3c -r 2e84b30f6664 sys/arch/alpha/alpha/pmap.c
--- a/sys/arch/alpha/alpha/pmap.c       Sun May 30 01:29:16 2021 +0000
+++ b/sys/arch/alpha/alpha/pmap.c       Sun May 30 01:41:45 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.283 2021/05/30 01:24:19 thorpej Exp $ */
+/* $NetBSD: pmap.c,v 1.284 2021/05/30 01:41:45 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 1.283 2021/05/30 01:24:19 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.284 2021/05/30 01:41:45 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -1081,22 +1081,6 @@
 }
 #endif /* MULTIPROCESSOR */
 
-static void
-pmap_tlb_physpage_free(paddr_t const ptpa,
-    struct pmap_tlb_context * const tlbctx)
-{
-       struct vm_page * const pg = PHYS_TO_VM_PAGE(ptpa);
-
-       KASSERT(pg != NULL);
-
-#ifdef DEBUG
-       struct vm_page_md * const md = VM_PAGE_TO_MD(pg);
-       KDASSERT(md->pvh_refcnt == 0);
-#endif
-
-       LIST_INSERT_HEAD(&tlbctx->t_freeptq, pg, pageq.list);
-}
-
 static __inline void
 pmap_tlb_ptpage_drain(struct pmap_tlb_context * const tlbctx)
 {
@@ -1116,8 +1100,9 @@
 /*
  * PT page management functions.
  */
-static int     pmap_ptpage_alloc(pt_entry_t *, int);
-static void    pmap_ptpage_free(pt_entry_t *, struct pmap_tlb_context *);
+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 *,
@@ -1398,6 +1383,7 @@
         * generation.
         */
        memset(pmap_kernel(), 0, sizeof(struct pmap));
+       LIST_INIT(&pmap_kernel()->pm_ptpages);
        atomic_store_relaxed(&pmap_kernel()->pm_count, 1);
        /* Kernel pmap does not have per-CPU info. */
        TAILQ_INSERT_TAIL(&pmap_all_pmaps, pmap_kernel(), pm_list);
@@ -1581,6 +1567,7 @@
 
        pmap = pool_cache_get(&pmap_pmap_cache, PR_WAITOK);
        memset(pmap, 0, sizeof(*pmap));
+       LIST_INIT(&pmap->pm_ptpages);
 
        atomic_store_relaxed(&pmap->pm_count, 1);
 
@@ -2105,7 +2092,7 @@
                l1pte = pmap_l1pte(lev1map, va);
                if (pmap_pte_v(l1pte) == 0) {
                        pmap_physpage_addref(l1pte);
-                       error = pmap_ptpage_alloc(l1pte, PGU_L2PT);
+                       error = pmap_ptpage_alloc(pmap, l1pte, PGU_L2PT);
                        if (error) {
                                pmap_l1pt_delref(pmap, l1pte);
                                if (flags & PMAP_CANFAIL)
@@ -2129,7 +2116,7 @@
                l2pte = pmap_l2pte(lev1map, va, l1pte);
                if (pmap_pte_v(l2pte) == 0) {
                        pmap_physpage_addref(l2pte);
-                       error = pmap_ptpage_alloc(l2pte, PGU_L3PT);
+                       error = pmap_ptpage_alloc(pmap, l2pte, PGU_L3PT);
                        if (error) {
                                /* unlocks pmap */
                                pmap_enter_l2pt_delref(pmap, l1pte, l2pte);
@@ -3652,7 +3639,7 @@
  *     Note: the pmap must already be locked.
  */
 static int
-pmap_ptpage_alloc(pt_entry_t * const pte, int const usage)
+pmap_ptpage_alloc(pmap_t pmap, pt_entry_t * const pte, int const usage)
 {
        /*
         * Allocate the page table page.
@@ -3662,6 +3649,8 @@
                return ENOMEM;
        }
 
+       LIST_INSERT_HEAD(&pmap->pm_ptpages, pg, pageq.list);
+
        /*
         * Initialize the referencing PTE.
         */
@@ -3682,7 +3671,8 @@
  *     Note: the pmap must already be locked.
  */
 static void
-pmap_ptpage_free(pt_entry_t * const pte, struct pmap_tlb_context * const tlbctx)
+pmap_ptpage_free(pmap_t pmap, pt_entry_t * const pte,
+    struct pmap_tlb_context * const tlbctx)
 {
 
        /*
@@ -3692,10 +3682,18 @@
        const paddr_t ptpa = pmap_pte_pa(pte);
        atomic_store_relaxed(pte, PG_NV);
 
+       struct vm_page * const pg = PHYS_TO_VM_PAGE(ptpa);
+       KASSERT(pg != NULL);
+
 #ifdef DEBUG
+       struct vm_page_md * const md = VM_PAGE_TO_MD(pg);
+       KDASSERT(md->pvh_refcnt == 0);
+
        pmap_zero_page(ptpa);
 #endif
-       pmap_tlb_physpage_free(ptpa, tlbctx);
+
+       LIST_REMOVE(pg, pageq.list);
+       LIST_INSERT_HEAD(&tlbctx->t_freeptq, pg, pageq.list);
 }
 
 /*
@@ -3735,7 +3733,7 @@
                 * be dropped.
                 */
                KASSERT(tlbctx != NULL);
-               pmap_ptpage_free(l2pte, tlbctx);
+               pmap_ptpage_free(pmap, l2pte, tlbctx);
 
                /*
                 * We've freed a level 3 table, so we must invalidate
@@ -3786,7 +3784,7 @@
                 * be dropped.
                 */
                KASSERT(tlbctx != NULL);
-               pmap_ptpage_free(l1pte, tlbctx);
+               pmap_ptpage_free(pmap, l1pte, tlbctx);
 
                /*
                 * We've freed a level 2 table, so we must invalidate
diff -r 03667436cd3c -r 2e84b30f6664 sys/arch/alpha/include/pmap.h
--- a/sys/arch/alpha/include/pmap.h     Sun May 30 01:29:16 2021 +0000
+++ b/sys/arch/alpha/include/pmap.h     Sun May 30 01:41:45 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.h,v 1.89 2021/05/30 00:34:27 thorpej Exp $ */
+/* $NetBSD: pmap.h,v 1.90 2021/05/30 01:41:45 thorpej Exp $ */
 
 /*-
  * Copyright (c) 1998, 1999, 2000, 2001, 2007 The NetBSD Foundation, Inc.
@@ -150,8 +150,8 @@
        struct pmap_statistics  pm_stats;       /* [ 8] statistics */
        unsigned int            pm_count;       /* [24] reference count */
        unsigned int            __pm_spare0;    /* [28] spare field */
-       unsigned long           __pm_spare1;    /* [32] spare field */
-       unsigned long           __pm_spare2;    /* [40] spare field */
+       struct pmap_pagelist    pm_ptpages;     /* [32] list of PT pages */
+       unsigned long           __pm_spare1;    /* [40] spare field */
        TAILQ_ENTRY(pmap)       pm_list;        /* [48] list of all pmaps */
        /* -- COHERENCY_UNIT boundary -- */
        struct pmap_percpu      pm_percpu[];    /* [64] per-CPU data */