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From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Shier <pshier@google.com>,
	Raghavendra Rao Ananta <rananta@google.com>,
	Ricardo Koller <ricarkol@google.com>,
	Oliver Upton <oupton@google.com>, Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	kernel-team@android.com
Subject: [PATCH v2 14/16] arm64: Add a capability for FEAT_ECV
Date: Wed, 22 Sep 2021 22:19:39 +0100	[thread overview]
Message-ID: <20210922211941.2756270-15-maz@kernel.org> (raw)
In-Reply-To: <20210922211941.2756270-1-maz@kernel.org>

Add a new capability to detect the Enhanced Counter Virtualization
feature (FEAT_ECV).

Reviewed-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kernel/cpufeature.c | 10 ++++++++++
 arch/arm64/tools/cpucaps       |  1 +
 2 files changed, 11 insertions(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index f8a3067d10c6..26b11ce8fff6 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1926,6 +1926,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 		.sign = FTR_UNSIGNED,
 		.min_field_value = 1,
 	},
+	{
+		.desc = "Enhanced Counter Virtualization",
+		.capability = ARM64_HAS_ECV,
+		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+		.matches = has_cpuid_feature,
+		.sys_reg = SYS_ID_AA64MMFR0_EL1,
+		.field_pos = ID_AA64MMFR0_ECV_SHIFT,
+		.sign = FTR_UNSIGNED,
+		.min_field_value = 1,
+	},
 #ifdef CONFIG_ARM64_PAN
 	{
 		.desc = "Privileged Access Never",
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 49305c2e6dfd..7a7c58acd8f0 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -18,6 +18,7 @@ HAS_CRC32
 HAS_DCPODP
 HAS_DCPOP
 HAS_E0PD
+HAS_ECV
 HAS_EPAN
 HAS_GENERIC_AUTH
 HAS_GENERIC_AUTH_ARCH
-- 
2.30.2


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  parent reply	other threads:[~2021-09-22 21:29 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-22 21:19 [PATCH v2 00/16] clocksource/arm_arch_timer: Add basic ARMv8.6 support Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 01/16] clocksource/arm_arch_timer: Add build-time guards for unhandled register accesses Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 02/16] clocksource/arm_arch_timer: Drop CNT*_TVAL read accessors Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 03/16] clocksource/arm_arch_timer: Extend write side of timer register accessors to u64 Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 04/16] clocksource/arm_arch_timer: Move system register timer programming over to CVAL Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 05/16] clocksource/arm_arch_timer: Move drop _tval from erratum function names Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 06/16] clocksource/arm_arch_timer: Fix MMIO base address vs callback ordering issue Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 07/16] clocksource/arm_arch_timer: Move MMIO timer programming over to CVAL Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 08/16] clocksource/arm_arch_timer: Advertise 56bit timer to the core code Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 09/16] clocksource/arm_arch_timer: Work around broken CVAL implementations Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 10/16] clocksource/arm_arch_timer: Remove any trace of the TVAL programming interface Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 11/16] clocksource/arm_arch_timer: Drop unnecessary ISB on CVAL programming Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 12/16] clocksource/arm_arch_timer: Fix masking for high freq counters Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 13/16] clocksource/arch_arm_timer: Move workaround synchronisation around Marc Zyngier
2021-09-22 21:19 ` Marc Zyngier [this message]
2021-09-29 16:03   ` [PATCH v2 14/16] arm64: Add a capability for FEAT_ECV Will Deacon
2021-09-30  7:42     ` Marc Zyngier
2021-09-30  8:30       ` Will Deacon
2021-09-22 21:19 ` [PATCH v2 15/16] arm64: Add CNT{P, V}CTSS_EL0 alternatives to cnt{p, v}ct_el0 Marc Zyngier
2021-09-22 21:19 ` [PATCH v2 16/16] arm64: Add handling of CNTVCTSS traps Marc Zyngier

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