From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, will@kernel.org, maz@kernel.org,
mark.rutland@arm.com, dave.martin@arm.com,
catalin.marinas@arm.com, ard.biesheuvel@linaro.org,
christoffer.dall@arm.com,
Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v2 3/7] arm64: cpufeature: Fix the type of no FP/SIMD capability
Date: Tue, 17 Dec 2019 18:33:58 +0000 [thread overview]
Message-ID: <20191217183402.2259904-4-suzuki.poulose@arm.com> (raw)
In-Reply-To: <20191217183402.2259904-1-suzuki.poulose@arm.com>
The NO_FPSIMD capability is defined with scope SYSTEM, which implies
that the "absence" of FP/SIMD on at least one CPU is detected only
after all the SMP CPUs are brought up. However, we use the status
of this capability for every context switch. So, let us change
the scope to LOCAL_CPU to allow the detection of this capability
as and when the first CPU without FP is brought up.
Also, the current type allows hotplugged CPU to be brought up without
FP/SIMD when all the current CPUs have FP/SIMD and we have the userspace
up. Fix both of these issues by changing the capability to
BOOT_RESTRICTED_LOCAL_CPU_FEATURE.
Fixes: 82e0191a1aa11abf ("arm64: Support systems without FP/ASIMD")
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@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 d25ad65bfac2..2fc9f18e2d2d 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1369,7 +1369,7 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
{
/* FP/SIMD is not implemented */
.capability = ARM64_HAS_NO_FPSIMD,
- .type = ARM64_CPUCAP_SYSTEM_FEATURE,
+ .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE,
.min_field_value = 0,
.matches = has_no_fpsimd,
},
--
2.23.0
next prev parent reply other threads:[~2019-12-17 18:34 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-17 18:33 [PATCH v2 0/7] arm64: Fix support for no FP/SIMD Suzuki K Poulose
2019-12-17 18:33 ` [PATCH v2 1/7] arm64: Introduce system_capabilities_finalized() marker Suzuki K Poulose
2020-01-10 14:50 ` Catalin Marinas
2019-12-17 18:33 ` [PATCH v2 2/7] arm64: fpsimd: Make sure SVE setup is complete before SIMD is used Suzuki K Poulose
2020-01-10 11:51 ` Catalin Marinas
2020-01-10 18:41 ` Suzuki Kuruppassery Poulose
2019-12-17 18:33 ` Suzuki K Poulose [this message]
2020-01-10 14:50 ` [PATCH v2 3/7] arm64: cpufeature: Fix the type of no FP/SIMD capability Catalin Marinas
2019-12-17 18:33 ` [PATCH v2 4/7] arm64: cpufeature: Set the FP/SIMD compat HWCAP bits properly Suzuki K Poulose
2020-01-10 14:51 ` Catalin Marinas
2019-12-17 18:34 ` [PATCH v2 5/7] arm64: ptrace: nofpsimd: Fail FP/SIMD regset operations Suzuki K Poulose
2020-01-10 15:12 ` Catalin Marinas
2020-01-10 18:42 ` Suzuki Kuruppassery Poulose
2019-12-17 18:34 ` [PATCH v2 6/7] arm64: signal: nofpsimd: Handle fp/simd context for signal frames Suzuki K Poulose
2020-01-10 12:34 ` Catalin Marinas
2019-12-17 18:34 ` [PATCH v2 7/7] arm64: nofpsmid: Handle TIF_FOREIGN_FPSTATE flag cleanly Suzuki K Poulose
2019-12-17 19:05 ` Marc Zyngier
2019-12-18 11:42 ` Suzuki Kuruppassery Poulose
2019-12-18 11:56 ` Marc Zyngier
2019-12-18 12:00 ` Suzuki Kuruppassery Poulose
2020-01-10 15:21 ` Marc Zyngier
2020-01-13 10:28 ` Suzuki Kuruppassery Poulose
2020-01-10 14:49 ` Catalin Marinas
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