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,
mark.rutland@arm.com, Julien Thierry <julien.thierry@arm.com>
Subject: [PATCH v9 26/26] arm64: Enable the support of pseudo-NMIs
Date: Mon, 21 Jan 2019 15:33:45 +0000 [thread overview]
Message-ID: <1548084825-8803-27-git-send-email-julien.thierry@arm.com> (raw)
In-Reply-To: <1548084825-8803-1-git-send-email-julien.thierry@arm.com>
Add a build option and a command line parameter to build and enable the
support of pseudo-NMIs.
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>
---
Documentation/admin-guide/kernel-parameters.txt | 6 ++++++
arch/arm64/Kconfig | 14 ++++++++++++++
arch/arm64/kernel/cpufeature.c | 11 ++++++++++-
3 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index b799bcf..173e2cc 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1197,6 +1197,12 @@
to discrete, to make X server driver able to add WB
entry later. This parameter enables that.
+ enable_pseudo_nmi [ARM64]
+ Enables support for pseudo-NMIs in the kernel. This
+ requires both the kernel to be built with
+ CONFIG_ARM64_PSEUDO_NMI and to be running on a
+ platform with GICv3.
+
enable_timer_pin_1 [X86]
Enable PIN 1 of APIC timer
Can be useful to work around chipset bugs
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a4168d3..8d84bfd 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1328,6 +1328,20 @@ config ARM64_MODULE_PLTS
bool
select HAVE_MOD_ARCH_SPECIFIC
+config ARM64_PSEUDO_NMI
+ bool "Support for NMI-like interrupts"
+ select CONFIG_ARM_GIC_V3
+ help
+ Adds support for mimicking Non-Maskable Interrupts through the use of
+ GIC interrupt priority. This support requires version 3 or later of
+ Arm GIC.
+
+ This high priority configuration for interrupts need to be
+ explicitly enabled through the new kernel parameter
+ "enable_pseudo_nmi".
+
+ If unsure, say N
+
config RELOCATABLE
bool
help
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index b530fb24..e66d778 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1207,10 +1207,19 @@ static void cpu_enable_address_auth(struct arm64_cpu_capabilities const *cap)
#endif /* CONFIG_ARM64_PTR_AUTH */
#ifdef CONFIG_ARM64_PSEUDO_NMI
+static bool enable_pseudo_nmi;
+
+static int __init early_enable_pseudo_nmi(char *p)
+{
+ enable_pseudo_nmi = true;
+ return 0;
+}
+early_param("enable_pseudo_nmi", early_enable_pseudo_nmi);
+
static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry,
int scope)
{
- return false;
+ return enable_pseudo_nmi && has_useable_gicv3_cpuif(entry, scope);
}
#endif
--
1.9.1
next prev parent reply other threads:[~2019-01-21 15:35 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-21 15:33 [PATCH v9 00/26] arm64: provide pseudo NMI with GICv3 Julien Thierry
2019-01-21 15:33 ` [PATCH v9 01/26] arm64: Fix HCR.TGE status for NMI contexts Julien Thierry
2019-01-28 11:48 ` James Morse
2019-01-28 15:42 ` Julien Thierry
2019-01-31 8:19 ` Christoffer Dall
2019-01-31 8:56 ` Julien Thierry
2019-01-31 9:27 ` Christoffer Dall
2019-01-31 9:40 ` Julien Thierry
2019-01-31 9:48 ` Christoffer Dall
2019-01-31 9:53 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 02/26] arm64: Remove unused daif related functions/macros Julien Thierry
2019-01-28 9:21 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 03/26] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature Julien Thierry
2019-01-28 9:22 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 04/26] arm64: cpufeature: Add cpufeature for IRQ priority masking Julien Thierry
2019-01-28 9:24 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 05/26] arm/arm64: gic-v3: Add PMR and RPR accessors Julien Thierry
2019-01-28 9:25 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 06/26] irqchip/gic-v3: Switch to PMR masking before calling IRQ handler Julien Thierry
2019-01-28 9:30 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 07/26] arm64: ptrace: Provide definitions for PMR values Julien Thierry
2019-01-28 9:37 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 08/26] arm64: Make PMR part of task context Julien Thierry
2019-01-28 9:42 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 09/26] arm64: Unmask PMR before going idle Julien Thierry
2019-01-22 15:23 ` Catalin Marinas
2019-01-22 20:18 ` Ard Biesheuvel
2019-01-23 8:56 ` Julien Thierry
2019-01-23 9:38 ` Ard Biesheuvel
2019-01-28 9:44 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 10/26] arm64: kvm: Unmask PMR before entering guest Julien Thierry
2019-01-28 9:58 ` Marc Zyngier
2019-01-30 12:07 ` Christoffer Dall
2019-01-30 14:58 ` Julien Thierry
2019-01-21 15:33 ` [PATCH v9 11/26] efi: Let architectures decide the flags that should be saved/restored Julien Thierry
2019-01-21 15:42 ` Ard Biesheuvel
2019-01-23 9:04 ` Julien Thierry
2019-01-28 10:00 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 12/26] arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking Julien Thierry
2019-01-21 15:45 ` Ard Biesheuvel
2019-01-21 18:05 ` Julien Thierry
2019-01-22 15:21 ` Catalin Marinas
2019-01-23 10:44 ` Julien Thierry
2019-01-30 11:52 ` Julien Thierry
2019-01-21 15:33 ` [PATCH v9 13/26] arm64: daifflags: Include PMR in daifflags restore operations Julien Thierry
2019-01-28 10:37 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 14/26] arm64: alternative: Allow alternative status checking per cpufeature Julien Thierry
2019-01-28 11:00 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 15/26] arm64: alternative: Apply alternatives early in boot process Julien Thierry
2019-01-28 11:17 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 16/26] irqchip/gic-v3: Factor group0 detection into functions Julien Thierry
2019-01-28 11:19 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 17/26] arm64: Switch to PMR masking when starting CPUs Julien Thierry
2019-01-28 11:21 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 18/26] arm64: gic-v3: Implement arch support for priority masking Julien Thierry
2019-01-28 11:23 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 19/26] irqchip/gic-v3: Detect if GIC can support pseudo-NMIs Julien Thierry
2019-01-28 11:39 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 20/26] irqchip/gic-v3: Handle pseudo-NMIs Julien Thierry
2019-01-28 11:59 ` Marc Zyngier
2019-01-29 11:33 ` Julien Thierry
2019-01-29 12:31 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 21/26] irqchip/gic: Add functions to access irq priorities Julien Thierry
2019-01-28 12:04 ` Marc Zyngier
2019-01-29 11:36 ` Julien Thierry
2019-01-21 15:33 ` [PATCH v9 22/26] irqchip/gic-v3: Allow interrupts to be set as pseudo-NMI Julien Thierry
2019-01-26 10:19 ` liwei (GF)
2019-01-26 10:41 ` Marc Zyngier
2019-01-28 8:57 ` Julien Thierry
2019-01-28 13:59 ` liwei (GF)
2019-01-28 14:49 ` Julien Thierry
2019-01-28 12:08 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 23/26] arm64: Handle serror in NMI context Julien Thierry
2019-01-28 12:26 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 24/26] arm64: Skip preemption when exiting an NMI Julien Thierry
2019-01-28 12:34 ` Marc Zyngier
2019-01-21 15:33 ` [PATCH v9 25/26] arm64: Skip irqflags tracing for NMI in IRQs disabled context Julien Thierry
2019-01-28 12:40 ` Marc Zyngier
2019-01-21 15:33 ` Julien Thierry [this message]
2019-01-28 12:47 ` [PATCH v9 26/26] arm64: Enable the support of pseudo-NMIs Marc Zyngier
2019-01-30 13:46 ` Julien Thierry
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