[POWERPC] Fix switch_slb handling of 1T ESID values

Now that we have 1TB segment size support, we need to be using the
GET_ESID_1T macro when comparing ESID values for pc, stack, and
unmapped_base within switch_slb().   A new helper function called
esids_match() contains the logic for deciding when to call GET_ESID
and GET_ESID_1T.

This fixes a duplicate-slb-entry inspired machine-check exception I
was seeing when trying to run java on a power6 partition.

Tested on power6 and power5.

Signed-off-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 31 insertions, 3 deletions

diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index 637afb2386b7..27922dff8b94 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -149,6 +149,35 @@ void slb_vmalloc_update(void)
         slb_flush_and_rebolt();
 }
 
+/* Helper function to compare esids.  There are four cases to handle.
+ * 1. The system is not 1T segment size capable.  Use the GET_ESID compare.
+ * 2. The system is 1T capable, both addresses are < 1T, use the GET_ESID compare.
+ * 3. The system is 1T capable, only one of the two addresses is > 1T.  This is not a match.
+ * 4. The system is 1T capable, both addresses are > 1T, use the GET_ESID_1T macro to compare.
+ */
+static inline int esids_match(unsigned long addr1, unsigned long addr2)
+{
+        int esid_1t_count;
+
+        /* System is not 1T segment size capable. */
+        if (!cpu_has_feature(CPU_FTR_1T_SEGMENT))
+                return (GET_ESID(addr1) == GET_ESID(addr2));
+
+        esid_1t_count = (((addr1 >> SID_SHIFT_1T) != 0) +
+                                ((addr2 >> SID_SHIFT_1T) != 0));
+
+        /* both addresses are < 1T */
+        if (esid_1t_count == 0)
+                return (GET_ESID(addr1) == GET_ESID(addr2));
+
+        /* One address < 1T, the other > 1T.  Not a match */
+        if (esid_1t_count == 1)
+                return 0;
+
+        /* Both addresses are > 1T. */
+        return (GET_ESID_1T(addr1) == GET_ESID_1T(addr2));
+}
+
 /* Flush all user entries from the segment table of the current processor. */
 void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
 {
@@ -194,15 +223,14 @@ void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
                 return;
         slb_allocate(pc);
 
-        if (GET_ESID(pc) == GET_ESID(stack))
+        if (esids_match(pc,stack))
                 return;
 
         if (is_kernel_addr(stack))
                 return;
         slb_allocate(stack);
 
-        if ((GET_ESID(pc) == GET_ESID(unmapped_base))
-            || (GET_ESID(stack) == GET_ESID(unmapped_base)))
+        if (esids_match(pc,unmapped_base) || esids_match(stack,unmapped_base))
                 return;
 
         if (is_kernel_addr(unmapped_base))