Commit 74283cfe authored by Maciej W. Rozycki's avatar Maciej W. Rozycki Committed by Thomas Bogendoerfer
Browse files

MIPS: mm: Suppress TLB uniquification on EHINV hardware 



Hardware that supports the EHINV feature, mandatory for R6 ISA and FTLB
implementation, lets software mark TLB entries invalid, which eliminates
the need to ensure no duplicate matching entries are ever created.  This
feature is already used by local_flush_tlb_all(), via the UNIQUE_ENTRYHI
macro, making the preceding call to r4k_tlb_uniquify() superfluous.

The next change will also modify uniquification code such that it'll
become incompatible with the FTLB and MMID features, as well as MIPSr6
CPUs that do not implement 4KiB pages.

Therefore prevent r4k_tlb_uniquify() from being used on EHINV hardware,
as denoted by `cpu_has_tlbinv'.

Signed-off-by: default avatarMaciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent 8374c2cb

arch/mips/mm/tlb-r4k.c

+2 −1
Original line number Diff line number Diff line
@@ -640,6 +640,7 @@ static void r4k_tlb_configure(void) 
	temp_tlb_entry = current_cpu_data.tlbsize - 1;



	/* From this point on the ARC firmware is dead.	 */

	if (!cpu_has_tlbinv)

		r4k_tlb_uniquify();

	local_flush_tlb_all();