Prepare for adding psind == 1 support to armv6's pmap_enter().
Precompute the new PTE before entering the critical section. Eliminate duplication of the pmap and pv list unlock operations in pmap_enter() by implementing a single return path. Otherwise, the duplication will only increase with the upcoming support for psind == 1. Reviewed by: mmel Tested by: mmel Discussed with: kib, markj MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D16443
This commit is contained in:
parent
5f9d7aafd8
commit
cd914c2fc2
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=336881
@ -3849,18 +3849,36 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
|
||||
pv_entry_t pv;
|
||||
vm_paddr_t opa, pa;
|
||||
vm_page_t mpte2, om;
|
||||
boolean_t wired;
|
||||
int rv;
|
||||
|
||||
va = trunc_page(va);
|
||||
mpte2 = NULL;
|
||||
wired = (flags & PMAP_ENTER_WIRED) != 0;
|
||||
|
||||
KASSERT(va <= vm_max_kernel_address, ("%s: toobig", __func__));
|
||||
KASSERT(va < UPT2V_MIN_ADDRESS || va >= UPT2V_MAX_ADDRESS,
|
||||
("%s: invalid to pmap_enter page table pages (va: 0x%x)", __func__,
|
||||
va));
|
||||
KASSERT((m->oflags & VPO_UNMANAGED) != 0 || va < kmi.clean_sva ||
|
||||
va >= kmi.clean_eva,
|
||||
("%s: managed mapping within the clean submap", __func__));
|
||||
if ((m->oflags & VPO_UNMANAGED) == 0 && !vm_page_xbusied(m))
|
||||
VM_OBJECT_ASSERT_LOCKED(m->object);
|
||||
KASSERT((flags & PMAP_ENTER_RESERVED) == 0,
|
||||
("%s: flags %u has reserved bits set", __func__, flags));
|
||||
pa = VM_PAGE_TO_PHYS(m);
|
||||
npte2 = PTE2(pa, PTE2_A, vm_page_pte2_attr(m));
|
||||
if ((flags & VM_PROT_WRITE) == 0)
|
||||
npte2 |= PTE2_NM;
|
||||
if ((prot & VM_PROT_WRITE) == 0)
|
||||
npte2 |= PTE2_RO;
|
||||
KASSERT((npte2 & (PTE2_NM | PTE2_RO)) != PTE2_RO,
|
||||
("pmap_enter: flags includes VM_PROT_WRITE but prot doesn't"));
|
||||
if ((prot & VM_PROT_EXECUTE) == 0)
|
||||
npte2 |= PTE2_NX;
|
||||
if ((flags & PMAP_ENTER_WIRED) != 0)
|
||||
npte2 |= PTE2_W;
|
||||
if (va < VM_MAXUSER_ADDRESS)
|
||||
npte2 |= PTE2_U;
|
||||
if (pmap != kernel_pmap)
|
||||
npte2 |= PTE2_NG;
|
||||
|
||||
rw_wlock(&pvh_global_lock);
|
||||
PMAP_LOCK(pmap);
|
||||
@ -3875,12 +3893,11 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
|
||||
if (mpte2 == NULL) {
|
||||
KASSERT((flags & PMAP_ENTER_NOSLEEP) != 0,
|
||||
("pmap_allocpte2 failed with sleep allowed"));
|
||||
sched_unpin();
|
||||
rw_wunlock(&pvh_global_lock);
|
||||
PMAP_UNLOCK(pmap);
|
||||
return (KERN_RESOURCE_SHORTAGE);
|
||||
rv = KERN_RESOURCE_SHORTAGE;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
} else
|
||||
mpte2 = NULL;
|
||||
pte1p = pmap_pte1(pmap, va);
|
||||
if (pte1_is_section(pte1_load(pte1p)))
|
||||
panic("%s: attempted on 1MB page", __func__);
|
||||
@ -3889,7 +3906,6 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
|
||||
panic("%s: invalid L1 page table entry va=%#x", __func__, va);
|
||||
|
||||
om = NULL;
|
||||
pa = VM_PAGE_TO_PHYS(m);
|
||||
opte2 = pte2_load(pte2p);
|
||||
opa = pte2_pa(opte2);
|
||||
/*
|
||||
@ -3902,9 +3918,9 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
|
||||
* are valid mappings in them. Hence, if a user page is wired,
|
||||
* the PT2 page will be also.
|
||||
*/
|
||||
if (wired && !pte2_is_wired(opte2))
|
||||
if (pte2_is_wired(npte2) && !pte2_is_wired(opte2))
|
||||
pmap->pm_stats.wired_count++;
|
||||
else if (!wired && pte2_is_wired(opte2))
|
||||
else if (!pte2_is_wired(npte2) && pte2_is_wired(opte2))
|
||||
pmap->pm_stats.wired_count--;
|
||||
|
||||
/*
|
||||
@ -3953,11 +3969,10 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
|
||||
* Enter on the PV list if part of our managed memory.
|
||||
*/
|
||||
if ((m->oflags & VPO_UNMANAGED) == 0) {
|
||||
KASSERT(va < kmi.clean_sva || va >= kmi.clean_eva,
|
||||
("%s: managed mapping within the clean submap", __func__));
|
||||
if (pv == NULL)
|
||||
if (pv == NULL) {
|
||||
pv = get_pv_entry(pmap, FALSE);
|
||||
pv->pv_va = va;
|
||||
pv->pv_va = va;
|
||||
}
|
||||
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_next);
|
||||
} else if (pv != NULL)
|
||||
free_pv_entry(pmap, pv);
|
||||
@ -3965,28 +3980,17 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
|
||||
/*
|
||||
* Increment counters
|
||||
*/
|
||||
if (wired)
|
||||
if (pte2_is_wired(npte2))
|
||||
pmap->pm_stats.wired_count++;
|
||||
|
||||
validate:
|
||||
/*
|
||||
* Now validate mapping with desired protection/wiring.
|
||||
*/
|
||||
npte2 = PTE2(pa, PTE2_NM, vm_page_pte2_attr(m));
|
||||
if (prot & VM_PROT_WRITE) {
|
||||
if (pte2_is_managed(npte2))
|
||||
vm_page_aflag_set(m, PGA_WRITEABLE);
|
||||
}
|
||||
else
|
||||
npte2 |= PTE2_RO;
|
||||
if ((prot & VM_PROT_EXECUTE) == 0)
|
||||
npte2 |= PTE2_NX;
|
||||
if (wired)
|
||||
npte2 |= PTE2_W;
|
||||
if (va < VM_MAXUSER_ADDRESS)
|
||||
npte2 |= PTE2_U;
|
||||
if (pmap != kernel_pmap)
|
||||
npte2 |= PTE2_NG;
|
||||
|
||||
/*
|
||||
* If the mapping or permission bits are different, we need
|
||||
@ -4016,9 +4020,6 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
|
||||
(opa != pa || (opte2 & PTE2_NX)))
|
||||
cache_icache_sync_fresh(va, pa, PAGE_SIZE);
|
||||
|
||||
npte2 |= PTE2_A;
|
||||
if (flags & VM_PROT_WRITE)
|
||||
npte2 &= ~PTE2_NM;
|
||||
if (opte2 & PTE2_V) {
|
||||
/* Change mapping with break-before-make approach. */
|
||||
opte2 = pte2_load_clear(pte2p);
|
||||
@ -4063,10 +4064,13 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
|
||||
vm_reserv_level_iffullpop(m) == 0)
|
||||
pmap_promote_pte1(pmap, pte1p, va);
|
||||
#endif
|
||||
|
||||
rv = KERN_SUCCESS;
|
||||
out:
|
||||
sched_unpin();
|
||||
rw_wunlock(&pvh_global_lock);
|
||||
PMAP_UNLOCK(pmap);
|
||||
return (KERN_SUCCESS);
|
||||
return (rv);
|
||||
}
|
||||
|
||||
/*
|
||||
|
Loading…
Reference in New Issue
Block a user