[RFC PATCH 02/17] powerpc/pseries: Update hpte find helper to take hash value

[Aneesh Kumar K.V]

The helper now also does secondary hash search so that we can use this in other
functions.

Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/pseries/lpar.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/lpar.c 
b/arch/powerpc/platforms/pseries/lpar.c
index 495ba4e7336d..edab68d9f9f3 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -328,15 +328,21 @@ static long pSeries_lpar_hpte_updatepp(unsigned long slot,
        return 0;
 }
 
-static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long 
hpte_group)
+static long __pSeries_lpar_hpte_find(unsigned long hash, unsigned long want_v)
 {
        long lpar_rc;
        unsigned long i, j;
+       unsigned long hpte_group;
+       bool secondary_search = false;
        struct {
                unsigned long pteh;
                unsigned long ptel;
        } ptes[4];
 
+       /* first check primary */
+       hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
+
+search_again:
        for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
 
                lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
@@ -346,31 +352,31 @@ static long __pSeries_lpar_hpte_find(unsigned long 
want_v, unsigned long hpte_gr
                for (j = 0; j < 4; j++) {
                        if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
                            (ptes[j].pteh & HPTE_V_VALID))
-                               return i + j;
+                               return hpte_group + j;
                }
        }
-
+       if (!secondary_search) {
+               hpte_group = (~hash & htab_hash_mask) * HPTES_PER_GROUP;
+               secondary_search = true;
+               goto search_again;
+       }
        return -1;
 }
 
 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
 {
        long slot;
-       unsigned long hash;
-       unsigned long want_v;
-       unsigned long hpte_group;
+       unsigned long hash, want_v;
 
        hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
        want_v = hpte_encode_avpn(vpn, psize, ssize);
-
-       /* Bolted entries are always in the primary group */
-       hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
-       slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
+       slot = __pSeries_lpar_hpte_find(hash, want_v);
        if (slot < 0)
                return -1;
-       return hpte_group + slot;
+       return slot;
 }
 
+
 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
                                             unsigned long ea,
                                             int psize, int ssize)
-- 
2.13.3