linux-kernel - [PATCH 01/15] MIPS: Detect MIPSr6 Virtual Processor support

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Date:	Wed, 3 Feb 2016 03:15:21 +0000
From:	Paul Burton <paul.burton@...tec.com>
To:	<linux-mips@...ux-mips.org>, Ralf Baechle <ralf@...ux-mips.org>
CC:	Paul Burton <paul.burton@...tec.com>,
	"Maciej W. Rozycki" <macro@...tec.com>,
	Joshua Kinard <kumba@...too.org>,
	"Steven J. Hill" <Steven.Hill@...tec.com>,
	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>,
	<linux-kernel@...r.kernel.org>,
	James Hogan <james.hogan@...tec.com>,
	"Markos Chandras" <markos.chandras@...tec.com>
Subject: [PATCH 01/15] MIPS: Detect MIPSr6 Virtual Processor support

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@...tec.com>
---

 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