ppc64 iSeries: Update create_pte_mapping to replace iSeries_bolt_kernel()

early_setup() calls htab_initialize() which is similar, but not identical
to iSeries_bolt_kernel().

On iSeries the Hypervisor has already inserted some ptes for us, and we
simply have to detect that and bolt them. iSeries_hpte_bolt_or_insert()
implements that logic.

For the case of a non-existing pte we just call iSeries_hpte_insert(). This
appears to work, although it's not entirely equivalent to the old code in
iSeries_make_pte() which panicked if we got a secondary slot. Not sure if
that's important.

Finally we call iSeries_hpte_bolt_or_insert() from create_pte_mapping(),
which is called from htab_initialize() for each lmb region.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/iSeries_htab.c b/arch/ppc64/kernel/iSeries_htab.c
index 2192055a90a0..9a2be3abf349 100644
--- a/arch/ppc64/kernel/iSeries_htab.c
+++ b/arch/ppc64/kernel/iSeries_htab.c
@@ -84,6 +84,25 @@ static long iSeries_hpte_insert(unsigned long hpte_group, unsigned long va,
         return (secondary << 3) | (slot & 7);
 }
 
+long iSeries_hpte_bolt_or_insert(unsigned long hpte_group,
+                unsigned long va, unsigned long prpn, unsigned long vflags,
+                unsigned long rflags)
+{
+        long slot;
+        hpte_t lhpte;
+
+        slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
+
+        if (lhpte.v & HPTE_V_VALID) {
+                /* Bolt the existing HPTE */
+                HvCallHpt_setSwBits(slot, 0x10, 0);
+                HvCallHpt_setPp(slot, PP_RWXX);
+                return 0;
+        }
+
+        return iSeries_hpte_insert(hpte_group, va, prpn, vflags, rflags);
+}
+
 static unsigned long iSeries_hpte_getword0(unsigned long slot)
 {
         hpte_t hpte;