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

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/
hifive-unleashed-5.1
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);