linux-kernel - [PATCH 2/7] powerpc/dt_cpu_ftrs: Add feature for 2nd DAWR

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Message-Id: <20200602040106.127693-3-ravi.bangoria@linux.ibm.com>
Date:   Tue,  2 Jun 2020 09:31:01 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     mpe@...erman.id.au, mikey@...ling.org
Cc:     ravi.bangoria@...ux.ibm.com, apopple@...ux.ibm.com,
        paulus@...ba.org, npiggin@...il.com, christophe.leroy@....fr,
        naveen.n.rao@...ux.vnet.ibm.com, peterz@...radead.org,
        jolsa@...nel.org, oleg@...hat.com, fweisbec@...il.com,
        mingo@...nel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] powerpc/dt_cpu_ftrs: Add feature for 2nd DAWR

Add new device-tree feature for 2nd DAWR. If this feature is present,
2nd DAWR is supported, otherwise not.

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
---
 arch/powerpc/include/asm/cputable.h | 7 +++++--
 arch/powerpc/kernel/dt_cpu_ftrs.c   | 7 +++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index e506d429b1af..3445c86e1f6f 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -214,6 +214,7 @@ static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTR_P9_TLBIE_ERAT_BUG	LONG_ASM_CONST(0x0001000000000000)
 #define CPU_FTR_P9_RADIX_PREFETCH_BUG	LONG_ASM_CONST(0x0002000000000000)
 #define CPU_FTR_ARCH_31			LONG_ASM_CONST(0x0004000000000000)
+#define CPU_FTR_DAWR1			LONG_ASM_CONST(0x0008000000000000)
 
 #ifndef __ASSEMBLY__
 
@@ -497,14 +498,16 @@ static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTRS_POSSIBLE	\
 	    (CPU_FTRS_POWER7 | CPU_FTRS_POWER8E | CPU_FTRS_POWER8 | \
 	     CPU_FTR_ALTIVEC_COMP | CPU_FTR_VSX_COMP | CPU_FTRS_POWER9 | \
-	     CPU_FTRS_POWER9_DD2_1 | CPU_FTRS_POWER9_DD2_2 | CPU_FTRS_POWER10)
+	     CPU_FTRS_POWER9_DD2_1 | CPU_FTRS_POWER9_DD2_2 | CPU_FTRS_POWER10 | \
+	     CPU_FTR_DAWR1)
 #else
 #define CPU_FTRS_POSSIBLE	\
 	    (CPU_FTRS_PPC970 | CPU_FTRS_POWER5 | \
 	     CPU_FTRS_POWER6 | CPU_FTRS_POWER7 | CPU_FTRS_POWER8E | \
 	     CPU_FTRS_POWER8 | CPU_FTRS_CELL | CPU_FTRS_PA6T | \
 	     CPU_FTR_VSX_COMP | CPU_FTR_ALTIVEC_COMP | CPU_FTRS_POWER9 | \
-	     CPU_FTRS_POWER9_DD2_1 | CPU_FTRS_POWER9_DD2_2 | CPU_FTRS_POWER10)
+	     CPU_FTRS_POWER9_DD2_1 | CPU_FTRS_POWER9_DD2_2 | CPU_FTRS_POWER10 | \
+	     CPU_FTR_DAWR1)
 #endif /* CONFIG_CPU_LITTLE_ENDIAN */
 #endif
 #else
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 0a41fce34165..c1c63c6724ea 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -568,6 +568,12 @@ static int __init feat_enable_mma(struct dt_cpu_feature *f)
 	return 1;
 }
 
+static int __init feat_enable_dawr1(struct dt_cpu_feature *f)
+{
+	cur_cpu_spec->cpu_features |= CPU_FTR_DAWR1;
+	return 1;
+}
+
 struct dt_cpu_feature_match {
 	const char *name;
 	int (*enable)(struct dt_cpu_feature *f);
@@ -643,6 +649,7 @@ static struct dt_cpu_feature_match __initdata
 	{"wait-v3", feat_enable, 0},
 	{"prefix-instructions", feat_enable, 0},
 	{"matrix-multiply-assist", feat_enable_mma, 0},
+	{"dawr1", feat_enable_dawr1, 0},
 };
 
 static bool __initdata using_dt_cpu_ftrs;
-- 
2.26.2