The *Aptiv cores can use the CONF7/IAR bit to detect if the core
has hardware support to remove instruction cache aliasing.
Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
---
This patch is for the upstream-sfr/mips-for-linux-next tree
---
arch/mips/include/asm/mipsregs.h | 3 +++
arch/mips/mm/c-r4k.c | 5 ++++-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index bbc3dd4..0c74617 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -653,6 +653,9 @@
#define MIPS_CONF7_RPS (_ULCAST_(1) << 2)
+#define MIPS_CONF7_IAR (_ULCAST_(1) << 10)
+#define MIPS_CONF7_AR (_ULCAST_(1) << 16)
+
/* EntryHI bit definition */
#define MIPS_ENTRYHI_EHINV (_ULCAST_(1) << 10)
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 13b549a..e790524 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -1110,7 +1110,10 @@ static void probe_pcache(void)
case CPU_PROAPTIV:
if (current_cpu_type() == CPU_74K)
alias_74k_erratum(c);
- if ((read_c0_config7() & (1 << 16))) {
+ if (!(read_c0_config7() & MIPS_CONF7_IAR))
+ if (c->icache.waysize > PAGE_SIZE)
+ c->icache.flags |= MIPS_CACHE_ALIASES;
+ if (read_c0_config7() & MIPS_CONF7_AR) {
/* effectively physically indexed dcache,
thus no virtual aliases. */
c->dcache.flags |= MIPS_CACHE_PINDEX;
--
1.8.5.3
