MIPS: dump_tlb: Take global bit into account

The TLB only matches the ASID when the global bit isn't set, so
dump_tlb() shouldn't really be skipping global entries just because the
ASID doesn't match. Fix the condition to read the TLB entry's global bit
from EntryLo0. Note that after a TLB read the global bits in both
EntryLo registers reflect the same global bit in the TLB entry.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10079/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/lib/dump_tlb.c

@@ -73,7 +73,15 @@ static void dump_tlb(int first, int last)
 		 */
 		if ((entryhi & ~0x1ffffUL) == CKSEG0)
 			continue;
-		if ((entryhi & 0xff) != asid)
+		/*
+		 * ASID takes effect in absence of G (global) bit.
+		 * We check both G bits, even though architecturally they should
+		 * match one another, because some revisions of the SB1 core may
+		 * leave only a single G bit set after a machine check exception
+		 * due to duplicate TLB entry.
+		 */
+		if (!((entrylo0 | entrylo1) & MIPS_ENTRYLO_G) &&
+		    (entryhi & 0xff) != asid)
 			continue;
 
 		/*

arch/mips/lib/r3k_dump_tlb.c

@@ -35,8 +35,9 @@ static void dump_tlb(int first, int last)
 		entrylo0 = read_c0_entrylo0();
 
 		/* Unused entries have a virtual address of KSEG0.  */
-		if ((entryhi & PAGE_MASK) != KSEG0
-		    && (entryhi & ASID_MASK) == asid) {
+		if ((entryhi & PAGE_MASK) != KSEG0 &&
+		    (entrylo0 & R3K_ENTRYLO_G ||
+		     (entryhi & ASID_MASK) == asid)) {
 			/*
 			 * Only print entries in use
 			 */