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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2013-05-31 01:03:24 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-01 08:29:26 +1000
commit0608d692463598c1d6e826d9dd7283381b4f246c (patch)
tree646aee0d04c866118215cfa9a7529108287309e2
parent280a5ba22ca35575721d42e536176a3561f4ec43 (diff)
downloadlinux-0608d692463598c1d6e826d9dd7283381b4f246c.tar.gz
powerpc/mm: Always invalidate tlb on hpte invalidate and update
If a hash bucket gets full, we "evict" a more/less random entry from it. When we do that we don't invalidate the TLB (hpte_remove) because we assume the old translation is still technically "valid". This implies that when we are invalidating or updating pte, even if HPTE entry is not valid we should do a tlb invalidate. This was a regression introduced by b1022fbd293564de91596b8775340cf41ad5214c Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/mm/hash_native_64.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c
index 6a2aead5b0e..4c122c3f162 100644
--- a/arch/powerpc/mm/hash_native_64.c
+++ b/arch/powerpc/mm/hash_native_64.c
@@ -336,11 +336,18 @@ static long native_hpte_updatepp(unsigned long slot, unsigned long newpp,
hpte_v = hptep->v;
actual_psize = hpte_actual_psize(hptep, psize);
+ /*
+ * We need to invalidate the TLB always because hpte_remove doesn't do
+ * a tlb invalidate. If a hash bucket gets full, we "evict" a more/less
+ * random entry from it. When we do that we don't invalidate the TLB
+ * (hpte_remove) because we assume the old translation is still
+ * technically "valid".
+ */
if (actual_psize < 0) {
- native_unlock_hpte(hptep);
- return -1;
+ actual_psize = psize;
+ ret = -1;
+ goto err_out;
}
- /* Even if we miss, we need to invalidate the TLB */
if (!HPTE_V_COMPARE(hpte_v, want_v)) {
DBG_LOW(" -> miss\n");
ret = -1;
@@ -350,6 +357,7 @@ static long native_hpte_updatepp(unsigned long slot, unsigned long newpp,
hptep->r = (hptep->r & ~(HPTE_R_PP | HPTE_R_N)) |
(newpp & (HPTE_R_PP | HPTE_R_N | HPTE_R_C));
}
+err_out:
native_unlock_hpte(hptep);
/* Ensure it is out of the tlb too. */
@@ -409,7 +417,7 @@ static void native_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
hptep = htab_address + slot;
actual_psize = hpte_actual_psize(hptep, psize);
if (actual_psize < 0)
- return;
+ actual_psize = psize;
/* Update the HPTE */
hptep->r = (hptep->r & ~(HPTE_R_PP | HPTE_R_N)) |
@@ -437,21 +445,27 @@ static void native_hpte_invalidate(unsigned long slot, unsigned long vpn,
hpte_v = hptep->v;
actual_psize = hpte_actual_psize(hptep, psize);
+ /*
+ * We need to invalidate the TLB always because hpte_remove doesn't do
+ * a tlb invalidate. If a hash bucket gets full, we "evict" a more/less
+ * random entry from it. When we do that we don't invalidate the TLB
+ * (hpte_remove) because we assume the old translation is still
+ * technically "valid".
+ */
if (actual_psize < 0) {
+ actual_psize = psize;
native_unlock_hpte(hptep);
- local_irq_restore(flags);
- return;
+ goto err_out;
}
- /* Even if we miss, we need to invalidate the TLB */
if (!HPTE_V_COMPARE(hpte_v, want_v))
native_unlock_hpte(hptep);
else
/* Invalidate the hpte. NOTE: this also unlocks it */
hptep->v = 0;
+err_out:
/* Invalidate the TLB */
tlbie(vpn, psize, actual_psize, ssize, local);
-
local_irq_restore(flags);
}