linux-kernel - [PATCH v2 1/3] arm64/cpufeature: Pull out helper for CPUID register definitions

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Message-Id: <20230303-arm64-cpufeature-helpers-v2-1-4c8f28a6f203@kernel.org>
Date:   Wed, 12 Apr 2023 18:13:29 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH v2 1/3] arm64/cpufeature: Pull out helper for CPUID
 register definitions

We use the same structure to match hwcaps and CPU features so we can use
the same helper to generate the fields required. Pull the portion of the
current hwcaps helper that initialises the fields out into a separate
define placed earlier in the file so we can use it for cpufeatures.

No functional change.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 arch/arm64/kernel/cpufeature.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 2e3e55139777..77862b7c8908 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -140,6 +140,13 @@ void dump_cpu_features(void)
 	pr_emerg("0x%*pb\n", ARM64_NCAPS, &cpu_hwcaps);
 }
 
+#define ARM64_CPUID_FIELDS(reg, field, min_value)			\
+		.sys_reg = SYS_##reg,							\
+		.field_pos = reg##_##field##_SHIFT,						\
+		.field_width = reg##_##field##_WIDTH,						\
+		.sign = reg##_##field##_SIGNED,							\
+		.min_field_value = reg##_##field##_##min_value,
+
 #define __ARM64_FTR_BITS(SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \
 	{						\
 		.sign = SIGNED,				\
@@ -2776,12 +2783,8 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 };
 
 #define HWCAP_CPUID_MATCH(reg, field, min_value)			\
-		.matches = has_user_cpuid_feature,					\
-		.sys_reg = SYS_##reg,							\
-		.field_pos = reg##_##field##_SHIFT,						\
-		.field_width = reg##_##field##_WIDTH,						\
-		.sign = reg##_##field##_SIGNED,							\
-		.min_field_value = reg##_##field##_##min_value,
+		.matches = has_user_cpuid_feature,			\
+		ARM64_CPUID_FIELDS(reg, field, min_value)
 
 #define __HWCAP_CAP(name, cap_type, cap)					\
 		.desc = name,							\
@@ -2811,26 +2814,26 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 #ifdef CONFIG_ARM64_PTR_AUTH
 static const struct arm64_cpu_capabilities ptr_auth_hwcap_addr_matches[] = {
 	{
-		HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, APA, PAuth)
+		ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, APA, PAuth)
 	},
 	{
-		HWCAP_CPUID_MATCH(ID_AA64ISAR2_EL1, APA3, PAuth)
+		ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, APA3, PAuth)
 	},
 	{
-		HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, API, PAuth)
+		ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, API, PAuth)
 	},
 	{},
 };
 
 static const struct arm64_cpu_capabilities ptr_auth_hwcap_gen_matches[] = {
 	{
-		HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, GPA, IMP)
+		ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, GPA, IMP)
 	},
 	{
-		HWCAP_CPUID_MATCH(ID_AA64ISAR2_EL1, GPA3, IMP)
+		ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, GPA3, IMP)
 	},
 	{
-		HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, GPI, IMP)
+		ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, GPI, IMP)
 	},
 	{},
 };

-- 
2.30.2