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Code Issues Releases Activity

Drop the pmap argument to pmap_invalidate_page(). It's not used other

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than in a KASSERT. The KASSERT is broken in that it's done outside the
critical section and as such isn't protected against CPU migration.
Improve pmap_invalidate_page() as follows:
o   calculate vhpt_ofs inside the critical region for exactly the same
    reason.
o   calculate the tag outside the FOREACH loop, as it's loop-invariant.
    This is more efficient.
o   Replace the test and set with an atomic cmpset operation because we
    are changing other CPU's VHPT tables and this avoids invalidating
    after the entry got modified. Not necessarily a problem, but better
    safe than sorry.
This commit is contained in:
Marcel Moolenaar 2010-03-22 04:24:19 +00:00
parent 7bc8a5971b
commit f73ddcd50b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=205435
1 changed files with 17 additions and 19 deletions
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36
sys/ia64/ia64/pmap.c
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@ -536,21 +536,19 @@ pmap_init(void)
***************************************************/
static void
pmap_invalidate_page(pmap_t pmap, vm_offset_t va)
pmap_invalidate_page(vm_offset_t va)
{
struct ia64_lpte *pte;
struct pcpu *pc;
uint64_t tag;
u_int vhpt_ofs;
KASSERT((pmap == kernel_pmap || pmap == PCPU_GET(md.current_pmap)),
("invalidating TLB for non-current pmap"));
vhpt_ofs = ia64_thash(va) - PCPU_GET(md.vhpt);
critical_enter();
vhpt_ofs = ia64_thash(va) - PCPU_GET(md.vhpt);
tag = ia64_ttag(va);
SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
pte = (struct ia64_lpte *)(pc->pc_md.vhpt + vhpt_ofs);
if (pte->tag == ia64_ttag(va))
pte->tag = 1UL << 63;
atomic_cmpset_64(&pte->tag, tag, 1UL << 63);
}
critical_exit();
mtx_lock_spin(&pmap_ptcmutex);
@ -794,7 +792,7 @@ get_pv_entry(pmap_t locked_pmap)
pte = pmap_find_vhpt(va);
KASSERT(pte != NULL, ("pte"));
pmap_remove_vhpt(va);
pmap_invalidate_page(pmap, va);
pmap_invalidate_page(va);
pmap_switch(oldpmap);
if (pmap_accessed(pte))
vm_page_flag_set(m, PG_REFERENCED);
@ -1170,7 +1168,7 @@ pmap_remove_pte(pmap_t pmap, struct ia64_lpte *pte, vm_offset_t va,
if (error)
return (error);
pmap_invalidate_page(pmap, va);
pmap_invalidate_page(va);
if (pmap_wired(pte))
pmap->pm_stats.wired_count -= 1;
@ -1238,7 +1236,7 @@ pmap_qenter(vm_offset_t va, vm_page_t *m, int count)
for (i = 0; i < count; i++) {
pte = pmap_find_kpte(va);
if (pmap_present(pte))
pmap_invalidate_page(kernel_pmap, va);
pmap_invalidate_page(va);
else
pmap_enter_vhpt(pte, va);
pmap_pte_prot(kernel_pmap, pte, VM_PROT_ALL);
@ -1261,7 +1259,7 @@ pmap_qremove(vm_offset_t va, int count)
pte = pmap_find_kpte(va);
if (pmap_present(pte)) {
pmap_remove_vhpt(va);
pmap_invalidate_page(kernel_pmap, va);
pmap_invalidate_page(va);
pmap_clear_present(pte);
}
va += PAGE_SIZE;
@ -1279,7 +1277,7 @@ pmap_kenter(vm_offset_t va, vm_offset_t pa)
pte = pmap_find_kpte(va);
if (pmap_present(pte))
pmap_invalidate_page(kernel_pmap, va);
pmap_invalidate_page(va);
else
pmap_enter_vhpt(pte, va);
pmap_pte_prot(kernel_pmap, pte, VM_PROT_ALL);
@ -1297,7 +1295,7 @@ pmap_kremove(vm_offset_t va)
pte = pmap_find_kpte(va);
if (pmap_present(pte)) {
pmap_remove_vhpt(va);
pmap_invalidate_page(kernel_pmap, va);
pmap_invalidate_page(va);
pmap_clear_present(pte);
}
}
@ -1491,7 +1489,7 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
ia64_sync_icache(sva, PAGE_SIZE);
pmap_pte_prot(pmap, pte, prot);
pmap_invalidate_page(pmap, sva);
pmap_invalidate_page(sva);
}
vm_page_unlock_queues();
pmap_switch(oldpmap);
@ -1582,7 +1580,7 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_prot_t access, vm_page_t m,
else if (pmap_exec(&origpte))
icache_inval = FALSE;
pmap_invalidate_page(pmap, va);
pmap_invalidate_page(va);
goto validate;
}
@ -1984,7 +1982,7 @@ pmap_ts_referenced(vm_page_t m)
if (pmap_accessed(pte)) {
count++;
pmap_clear_accessed(pte);
pmap_invalidate_page(pv->pv_pmap, pv->pv_va);
pmap_invalidate_page(pv->pv_va);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pv->pv_pmap);
@ -2063,7 +2061,7 @@ pmap_clear_modify(vm_page_t m)
KASSERT(pte != NULL, ("pte"));
if (pmap_dirty(pte)) {
pmap_clear_dirty(pte);
pmap_invalidate_page(pv->pv_pmap, pv->pv_va);
pmap_invalidate_page(pv->pv_va);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pv->pv_pmap);
@ -2092,7 +2090,7 @@ pmap_clear_reference(vm_page_t m)
KASSERT(pte != NULL, ("pte"));
if (pmap_accessed(pte)) {
pmap_clear_accessed(pte);
pmap_invalidate_page(pv->pv_pmap, pv->pv_va);
pmap_invalidate_page(pv->pv_va);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pv->pv_pmap);
@ -2128,7 +2126,7 @@ pmap_remove_write(vm_page_t m)
}
prot &= ~VM_PROT_WRITE;
pmap_pte_prot(pmap, pte, prot);
pmap_invalidate_page(pmap, pv->pv_va);
pmap_invalidate_page(pv->pv_va);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);