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From:   Julien Thierry <julien.thierry@arm.com>
To:     linux-arm-kernel@lists.infradead.org
Cc:     linux-kernel@vger.kernel.org, daniel.thompson@linaro.org,
        joel@joelfernandes.org, marc.zyngier@arm.com,
        christoffer.dall@arm.com, james.morse@arm.com,
        catalin.marinas@arm.com, will.deacon@arm.com,
        Julien Thierry <julien.thierry@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v6 02/24] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature
Date:   Mon, 12 Nov 2018 11:56:53 +0000
Message-Id: <1542023835-21446-3-git-send-email-julien.thierry@arm.com>
In-Reply-To: <1542023835-21446-1-git-send-email-julien.thierry@arm.com>
References: <1542023835-21446-1-git-send-email-julien.thierry@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

It is not supported to have some CPUs using GICv3 sysreg CPU interface
while some others do not.

Once ICC_SRE_EL1.SRE is set on a CPU, the bit cannot be cleared. Since
matching this feature require setting ICC_SRE_EL1.SRE, it cannot be
turned off if found on a CPU.

Set the feature as STRICT_BOOT, if boot CPU has it, all other CPUs are
required to have it.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Suggested-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm64/kernel/cpufeature.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index af50064..03a9d96 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1149,7 +1149,7 @@ static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused)
 	{
 		.desc = "GIC system register CPU interface",
 		.capability = ARM64_HAS_SYSREG_GIC_CPUIF,
-		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+		.type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
 		.matches = has_useable_gicv3_cpuif,
 		.sys_reg = SYS_ID_AA64PFR0_EL1,
 		.field_pos = ID_AA64PFR0_GIC_SHIFT,
-- 
1.9.1