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D54936.id172009.diff
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diff --git a/sys/powerpc/aim/mmu_oea64.c b/sys/powerpc/aim/mmu_oea64.c
--- a/sys/powerpc/aim/mmu_oea64.c
+++ b/sys/powerpc/aim/mmu_oea64.c
@@ -123,7 +123,7 @@
*/
#define PV_LOCK_COUNT MAXCPU
-static struct mtx_padalign pv_lock[PV_LOCK_COUNT];
+static struct rwlock __exclusive_cache_line pv_lock[PV_LOCK_COUNT];
#define PV_LOCK_SHIFT HPT_SP_SHIFT
#define pa_index(pa) ((pa) >> PV_LOCK_SHIFT)
@@ -138,11 +138,17 @@
#else
#define PV_LOCK_IDX(pa) (pa_index(pa) % PV_LOCK_COUNT)
#endif
-#define PV_LOCKPTR(pa) ((struct mtx *)(&pv_lock[PV_LOCK_IDX(pa)]))
-#define PV_LOCK(pa) mtx_lock(PV_LOCKPTR(pa))
-#define PV_UNLOCK(pa) mtx_unlock(PV_LOCKPTR(pa))
-#define PV_LOCKASSERT(pa) mtx_assert(PV_LOCKPTR(pa), MA_OWNED)
-#define PV_PAGE_LOCK(m) PV_LOCK(VM_PAGE_TO_PHYS(m))
+#define PV_LOCKPTR(pa) ((struct rwlock *)(&pv_lock[PV_LOCK_IDX(pa)]))
+
+#define PV_WR_LOCK(pa) rw_wlock(PV_LOCKPTR(pa))
+#define PV_RD_LOCK(pa) rw_rlock(PV_LOCKPTR(pa))
+#define PV_UNLOCK(pa) rw_unlock(PV_LOCKPTR(pa))
+#define PV_LOCKASSERT(pa) rw_assert(PV_LOCKPTR(pa), RA_LOCKED)
+#define PV_LOCK_RD_ASSERT(pa) rw_assert(PV_LOCKPTR(pa), RA_RLOCKED)
+#define PV_LOCK_WR_ASSERT(pa) rw_assert(PV_LOCKPTR(pa), RA_WLOCKED)
+
+#define PV_PAGE_WR_LOCK(m) PV_WR_LOCK(VM_PAGE_TO_PHYS(m))
+#define PV_PAGE_RD_LOCK(m) PV_RD_LOCK(VM_PAGE_TO_PHYS(m))
#define PV_PAGE_UNLOCK(m) PV_UNLOCK(VM_PAGE_TO_PHYS(m))
#define PV_PAGE_LOCKASSERT(m) PV_LOCKASSERT(VM_PAGE_TO_PHYS(m))
@@ -500,7 +506,7 @@
vm_page_to_pvoh(vm_page_t m)
{
- mtx_assert(PV_LOCKPTR(VM_PAGE_TO_PHYS(m)), MA_OWNED);
+ rw_assert(PV_LOCKPTR(VM_PAGE_TO_PHYS(m)), RA_LOCKED);
return (&m->md.mdpg_pvoh);
}
@@ -1028,7 +1034,7 @@
*/
mtx_init(&moea64_slb_mutex, "SLB table", NULL, MTX_DEF);
for (i = 0; i < PV_LOCK_COUNT; i++)
- mtx_init(&pv_lock[i], "page pv", NULL, MTX_DEF);
+ rw_init(&pv_lock[i], "pv lock");
/*
* Initialise the bootstrap pvo pool.
@@ -1644,7 +1650,7 @@
pvo->pvo_vaddr |= PVO_MANAGED;
}
- PV_LOCK(pa);
+ PV_WR_LOCK(pa);
PMAP_LOCK(pmap);
if (pvo->pvo_pmap == NULL)
init_pvo_entry(pvo, pmap, va);
@@ -2028,7 +2034,7 @@
return;
powerpc_sync();
- PV_PAGE_LOCK(m);
+ PV_PAGE_WR_LOCK(m);
refchg = 0;
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
pmap = pvo->pvo_pmap;
@@ -2101,7 +2107,7 @@
lo = moea64_calc_wimg(VM_PAGE_TO_PHYS(m), ma);
- PV_PAGE_LOCK(m);
+ PV_PAGE_WR_LOCK(m);
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
pmap = pvo->pvo_pmap;
PMAP_LOCK(pmap);
@@ -2360,7 +2366,7 @@
("moea64_page_exists_quick: page %p is not managed", m));
loops = 0;
rv = false;
- PV_PAGE_LOCK(m);
+ PV_PAGE_RD_LOCK(m);
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
if (!(pvo->pvo_vaddr & PVO_DEAD) && pvo->pvo_pmap == pmap) {
rv = true;
@@ -2395,7 +2401,7 @@
count = 0;
if ((m->oflags & VPO_UNMANAGED) != 0)
return (count);
- PV_PAGE_LOCK(m);
+ PV_PAGE_RD_LOCK(m);
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink)
if ((pvo->pvo_vaddr & (PVO_DEAD | PVO_WIRED)) == PVO_WIRED)
count++;
@@ -2765,7 +2771,7 @@
LIST_INIT(&freequeue);
- PV_PAGE_LOCK(m);
+ PV_PAGE_WR_LOCK(m);
LIST_FOREACH_SAFE(pvo, vm_page_to_pvoh(m), pvo_vlink, next_pvo) {
pmap = pvo->pvo_pmap;
PMAP_LOCK(pmap);
@@ -2988,7 +2994,7 @@
if (pvo->pvo_vaddr & PVO_MANAGED)
pg = PHYS_TO_VM_PAGE(PVO_PADDR(pvo));
- PV_LOCK(PVO_PADDR(pvo));
+ PV_WR_LOCK(PVO_PADDR(pvo));
moea64_pvo_remove_from_page_locked(pvo, pg);
PV_UNLOCK(PVO_PADDR(pvo));
}
@@ -3029,7 +3035,7 @@
*/
rv = false;
powerpc_sync();
- PV_PAGE_LOCK(m);
+ PV_PAGE_RD_LOCK(m);
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
if (PVO_IS_SP(pvo)) {
ret = moea64_sp_query(pvo, ptebit);
@@ -3089,7 +3095,7 @@
* For each pvo entry, clear the pte's ptebit.
*/
count = 0;
- PV_PAGE_LOCK(m);
+ PV_PAGE_WR_LOCK(m);
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
if (PVO_IS_SP(pvo)) {
if ((ret = moea64_sp_clear(pvo, m, ptebit)) != -1) {
@@ -3695,7 +3701,7 @@
}
}
- PV_LOCK(spa);
+ PV_WR_LOCK(spa);
PMAP_LOCK(pmap);
/* Note: moea64_remove_locked() also clears cached REF/CHG bits. */
@@ -4099,6 +4105,8 @@
pmap_t pmap;
struct pvo_entry *sp;
+ PV_LOCKASSERT(PVO_PADDR(pvo));
+
pmap = pvo->pvo_pmap;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
@@ -4131,12 +4139,18 @@
return (refchg);
}
+/*
+ * Note: this assumes the vm_page represented by the given pvo
+ * is at least read locked.
+ */
static int64_t
moea64_sp_query(struct pvo_entry *pvo, uint64_t ptebit)
{
int64_t refchg;
pmap_t pmap;
+ PV_LOCKASSERT(PVO_PADDR(pvo));
+
pmap = pvo->pvo_pmap;
PMAP_LOCK(pmap);

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