MIPSr6 introduces support for "Virtual Processors", which are
conceptually similar to VPEs from the now-deprecated MT ASE. Detect
whether the system supports VPs using the VP bit in Config5, adding
cpu_has_vp for use by later patches.
Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
---
arch/mips/include/asm/cpu-features.h | 4 ++++
arch/mips/include/asm/cpu.h | 1 +
arch/mips/include/asm/mipsregs.h | 1 +
arch/mips/kernel/cpu-probe.c | 2 ++
4 files changed, 8 insertions(+)
diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
index eeec8c8..57cdc5b 100644
--- a/arch/mips/include/asm/cpu-features.h
+++ b/arch/mips/include/asm/cpu-features.h
@@ -311,6 +311,10 @@
#define cpu_has_mipsmt (cpu_data[0].ases & MIPS_ASE_MIPSMT)
#endif
+#ifndef cpu_has_vp
+#define cpu_has_vp (cpu_data[0].options & MIPS_CPU_VP)
+#endif
+
#ifndef cpu_has_userlocal
#define cpu_has_userlocal (cpu_data[0].options & MIPS_CPU_ULRI)
#endif
diff --git a/arch/mips/include/asm/cpu.h b/arch/mips/include/asm/cpu.h
index a97ca97..82a26ed 100644
--- a/arch/mips/include/asm/cpu.h
+++ b/arch/mips/include/asm/cpu.h
@@ -388,6 +388,7 @@ enum cpu_type_enum {
#define MIPS_CPU_FTLB 0x20000000000ull /* CPU has Fixed-page-size TLB */
#define MIPS_CPU_NAN_LEGACY 0x40000000000ull /* Legacy NaN implemented */
#define MIPS_CPU_NAN_2008 0x80000000000ull /* 2008 NaN implemented */
+#define MIPS_CPU_VP 0x100000000000ull /* MIPSr6 Virtual Processors (multi-threading) */
/*
* CPU ASE encodings
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index 3ad19ad..ca251f6 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -623,6 +623,7 @@
#define MIPS_CONF5_MRP (_ULCAST_(1) << 3)
#define MIPS_CONF5_LLB (_ULCAST_(1) << 4)
#define MIPS_CONF5_MVH (_ULCAST_(1) << 5)
+#define MIPS_CONF5_VP (_ULCAST_(1) << 7)
#define MIPS_CONF5_FRE (_ULCAST_(1) << 8)
#define MIPS_CONF5_UFE (_ULCAST_(1) << 9)
#define MIPS_CONF5_MSAEN (_ULCAST_(1) << 27)
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index b725b71..e38442d 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -796,6 +796,8 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c)
if (config5 & MIPS_CONF5_MVH)
c->options |= MIPS_CPU_XPA;
#endif
+ if (cpu_has_mips_r6 && (config5 & MIPS_CONF5_VP))
+ c->options |= MIPS_CPU_VP;
return config5 & MIPS_CONF_M;
}
--
2.7.0
