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MIPS: mm: Use the TLBINVF instruction to flush the VTLB

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The TLBINVF instruction can be used to flush the entire VTLB.
This eliminates the need for the TLBWI loop and improves performance.

Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6138/
This commit is contained in:
Leonid Yegoshin 2013-11-14 16:12:30 +00:00 committed by Ralf Baechle
parent 198bb4cef1
commit 601cfa7b6f
1 changed files with 12 additions and 6 deletions
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18
arch/mips/mm/tlb-r4k.c
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@ -83,13 +83,19 @@ void local_flush_tlb_all(void)
entry = read_c0_wired();
/* Blast 'em all away. */
while (entry < current_cpu_data.tlbsize) {
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
write_c0_index(entry);
if (cpu_has_tlbinv && current_cpu_data.tlbsize) {
write_c0_index(0);
mtc0_tlbw_hazard();
tlb_write_indexed();
entry++;
tlbinvf(); /* invalidate VTLB */
} else {
while (entry < current_cpu_data.tlbsize) {
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
write_c0_index(entry);
mtc0_tlbw_hazard();
tlb_write_indexed();
entry++;
}
}
tlbw_use_hazard();
write_c0_entryhi(old_ctx);